CN117967287A - A coal mine underground drilling depth multiple measurement device and method - Google Patents

Abstract

The invention provides a coal mine underground drilling depth retest device and a method, the device comprises a shell, a tray is arranged in the bottom of the shell, a jack is arranged between the tray and the bottom wall of the shell, a side wing plate is arranged on the tray, a slide rail seat and a spring are sequentially arranged in the side wing plate from top to bottom, and a strain gauge is arranged on the slide rail seat; the top of the shell is internally provided with a roller, a space between the roller and the sliding rail seat is used for arranging a push rod, and the roller is arranged in the shell through a fixed seat, a support rod and a roller rotating shaft; the roller shaft is connected with a photoelectric encoder. According to the invention, the push rod can be pressed through the structure, the pressure born by the push rod can be monitored in real time, the push rod is ensured to be always kept in a pressed state in the measuring process, the push rod is prevented from slipping, and the accuracy and the precision of measured data are ensured. In addition, after the average value of the depth data output by the two photoelectric encoders is taken, the measurement precision is further improved in terms of numerical processing.

Description

A coal mine underground drilling depth multiple measurement device and method

Technical Field

The invention belongs to the technical field of coal mining, relates to borehole depth measurement, and specifically relates to a device and method for measuring the borehole depth in an underground coal mine.

Background technique

The complex coal seam conditions pose a serious threat to coal mine safety. How to prevent mine disasters during the production process and improve production efficiency has become a bottleneck restricting safe and efficient mining of coal mines. As the most direct and effective means, underground tunnel drilling in coal mines plays a key role in mine disaster prevention, hidden geological factors exploration, and coalbed methane resource development. At the same time, as the construction of transparent working faces in various mines increases year by year, the application of borehole geophysical exploration technology based on tunnel drilling is becoming more and more widespread, which leads to the need for each coal mine to construct a large number of conventional drilling or directional drilling to carry out the above work.

During the drilling construction process, construction workers usually calculate the drilling depth by combining the length of a single drill rod and counting the number of drill rods sent into the borehole. This method of manual drill rod counting has poor measurement accuracy, low degree of automation, and is prone to errors. In addition, the drilling depth is closely related to the project volume. The construction party usually settles with the mining party based on the project volume, which makes it difficult to verify the authenticity of the drilling depth calculated based on the number of drill rods. In addition, for geophysical drilling holes that require geological exploration, the geological information obtained after the detection instrument is sent into the borehole must accurately correspond to the drilling depth in order to reflect the true geological information. Therefore, it is essential to re-measure the drilling depth after the drilling construction is completed. The accurate measurement of the drilling depth is of great significance for ensuring construction quality, detecting geological information, and project settlement.

In-hole detection in coal mines often requires the probe part with sensors or data acquisition devices installed to be sent into the borehole for measurement. For medium- and long-depth boreholes with a depth greater than 150 meters, a drill rig is used to connect the drill rod to push the probe for measurement. For shallow holes with a depth of less than 150 meters, a push rod is often used to push the probe for measurement.

At present, in response to the need for verification of borehole depth and geophysical exploration in boreholes for refined and automated measurement of borehole depth, the existing technical improvements are as follows: First, the position of the probe in the borehole is obtained by measuring the length of the cable carried by the rear end of the probe into the borehole. Second, the borehole depth is calculated by tapping the tail end of the drill rod in the borehole and monitoring the transmission speed of the sound wave in the drill rod. Third, liquid is injected into the borehole, and the borehole depth is converted by measuring the pressure combined with the drilling trajectory.

Regarding the above-mentioned improvement methods and ideas, the cable measurement method at the tail end of the probe also requires manual measurement of the number of push rods, and the cable is prone to slipping on the roller. During actual construction and use, the cable between the orifice and the cable displacement measuring device cannot be guaranteed to be straight, resulting in the measurement probe position and the cable measurement depth cannot be guaranteed to be delivered synchronously in actual use, which often causes a mismatch between the measurement data and the depth data; the acoustic wave measurement method is easy to implement, but it is affected by the external environment during application, and the measurement effect is difficult to guarantee; the method of converting pressure into depth is restricted by external factors, and additional workload is generated during implementation.

Summary of the invention

In view of the defects and shortcomings of the prior art, the purpose of the present invention is to provide a device and method for repeatedly measuring the depth of underground drilling holes in coal mines, so as to solve the technical problem that the accuracy and precision of depth measurement of underground drilling holes in coal mines in the prior art need to be further improved.

In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

A device for re-measuring the depth of underground drilling in a coal mine comprises a shell; the shell comprises a shell body, both longitudinal ends of the shell body are open, a shell support plate is fixedly arranged on the outer side wall of the shell body, and the shell support plate is arranged along the longitudinal direction.

A tray is installed inside the bottom of the shell body, and multiple jacks are arranged between the bottom surface of the tray and the inner wall of the shell body, the bottom end of the jack is installed on the shell body, and the top end of the jack passes through the tray; a side wing plate is installed on the top surface of the two lateral sides of the tray, and a pair of side wing plates are arranged opposite to each other laterally, and a slide rail seat is arranged between the lateral inner sides of the pair of side wing plates, and the slide rail seat can move up and down along the vertical direction; multiple springs are arranged between the bottom surface of the slide rail seat and the top surface of the tray, the bottom end of the spring is installed on the tray, and the top end of the spring is fixedly installed on the slide rail seat, and the spring is located on the outside of the top end of the jack.

A roller is arranged inside the top of the shell body, and the space between the roller and the slide rail seat is a push rod cavity, which is used to set the push rod; a plurality of strain gauges are arranged on the inner wall at the middle position of the slide rail seat, and the plurality of strain gauges are evenly arranged along the longitudinal direction, the bottom surface of the strain gauge is fixedly arranged on the slide rail seat, and the top surface of the strain gauge is in contact with the push rod.

A fixing seat is respectively arranged at the longitudinal front and the longitudinal rear of the shell body, and the fixing seat is installed on the outer wall of the shell, and a pair of support rods are arranged in each fixing seat along the vertical direction, and the top of the pair of support rods is installed in the fixing seat, and a roller shaft is arranged between the bottoms of the pair of support rods, and the roller is fixedly installed on the roller shaft; the roller shaft is arranged along the transverse direction, and one transverse end of the roller shaft is rotatably installed in the support rod close to the transverse left side, and the other transverse end of the roller shaft passes through the support rod close to the transverse right side, the shell body and the fixing seat in sequence, and a photoelectric encoder is connected to the other transverse end of the roller shaft, and the photoelectric encoder is arranged on the shell support plate.

The present invention also has the following technical features:

A collection and controller installation hole is provided on the shell support plate between the two photoelectric encoders. The collection and controller are installed in the collection and controller installation hole. The collection and controller are connected to the photoelectric encoder, the jack and the strain gauge.

The longitudinal rear end of the shell body is fixed and coaxially provided with a shell flange, and a plurality of flange strip holes are opened at the edge of the shell flange, and the plurality of flange strip holes are evenly arranged along the circumferential direction of the shell flange.

The tray comprises a tray body in the middle and two arc-shaped bosses on the outer side, wherein the arc-shaped bosses and the tray body are integrated; and two tray steps are arranged on the lower end surface of the tray body.

The side wing plate comprises an upper limit plate, a middle support plate and a lower mounting plate. The bottom surface of the upper limit plate can contact the tray. The middle support plate is provided with side wing plate strip wiring holes.

The slide rail seat includes a slide rail seat body, on the top surface of which two slide rail seat bosses are integrally arranged, and the top surface of the slide rail seat body on the lateral outside contacts the top of the side wing plate; a plurality of grooves are arranged on the inner wall in the middle of the slide rail seat body and the inner wall of the slide rail seat boss, and the grooves are opened along the longitudinal direction.

The roller includes two outer roller edge sections and a middle roller center section. The roller outer edge sections and the roller center section are integrated. The surface of the roller outer edge section matches the shape of the top surface of the slide rail seat boss, and the surface of the roller center section matches the shape of the surface of the push rod.

A pair of support rod mounting holes are respectively provided on the fixing seat, and the support rod mounting holes are arranged along the vertical direction.

The top end of the support rod is provided with a support rod external thread, and the top end of the support rod is fixed to the upper end surface of the fixing seat by a nut.

The present invention also protects a method for re-measuring the depth of underground drilling in a coal mine, which uses the above-mentioned underground drilling depth re-measuring device to measure the depth of drilling; the depth of drilling is calculated according to the following formula I:

Where:

D represents the drilling depth;

r represents the minimum radius of the roller;

N ₁ represents the total number of pulses output by one of the photoelectric encoders;

n ₁ represents the number of pulses output by one of the photoelectric encoders when the push rod produces a displacement of 2πr;

N ₂ represents the total number of pulses output by another photoelectric encoder;

n ₂ represents the number of pulses output by another photoelectric encoder when the push rod produces a displacement of 2πr.

Compared with the prior art, the present invention has the following beneficial technical effects:

(I) The coal mine underground drilling depth complex measuring device of the present invention adopts a jack, a side wing plate, a slide rail seat, and a spring to form a lower support and clamping structure of the push rod, and adopts a fixed seat, a support rod, a roller shaft, and a roller to form an upper clamping structure of the push rod. The lower support and clamping structure of the push rod and the upper clamping structure of the push rod cooperate with each other to clamp the push rod; during the pushing process of the push rod, the pressure on the push rod can be monitored in real time through the strain gauge, which is convenient for judging and adjusting the clamping state of the push rod, so that the push rod can always be kept in a clamping state during the measurement process, avoiding the push rod from slipping, and ensuring the accuracy of the measurement data; when the push rod is pushed, the roller is driven to rotate, and the photoelectric encoder can convert the geometric displacement of the roller into pulses, thereby ensuring the precision of the measurement data.

(II) The coal mine underground drilling depth multiple measurement device of the present invention can automatically press the push rod during the measurement process, and will not move back and forth on the push rod without external force. The measurement is simple to implement, and no special person is required to operate during the observation process, which saves construction personnel.

(III) The coal mine underground drilling depth re-measurement method of the present invention adopts two photoelectric encoders for simultaneous measurement, and the results measured by the two photoelectric encoders can verify each other; at the same time, when calculating the drilling depth, the depth data output by the two photoelectric encoders are averaged to make the calculation result more accurate, and the measurement accuracy is further improved from the perspective of numerical processing.

(IV) The coal mine underground drilling depth re-measurement device and method of the present invention can ensure that the front-end detection device and the push rod are pushed at the same time during the pushing process of the push rod, and the measured depth can accurately correspond to the geophysical data collected by the probe. Compared with the measurement methods such as manual counting, cable displacement measurement, and acoustic wave measurement in the prior art when re-measuring the drilling depth, the device of the present invention has higher measurement accuracy and more reliable and stable measurement results.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a drilling depth complex measurement device in an underground coal mine.

FIG. 2 is a schematic structural diagram of a housing.

FIG. 3 is a schematic diagram of the structure of a tray.

FIG. 4 is a schematic structural diagram of a side wing plate.

FIG. 5 is a schematic structural diagram of a slide rail seat.

FIG. 6 is a front view of the slide rail seat.

Fig. 7 is a cross-sectional view along the A-A' plane of Fig. 6 .

FIG8 is a schematic diagram of the bottom structure of the slide rail seat.

FIG. 9 is a schematic structural diagram of a roller.

FIG. 10 is a front view of the roller.

FIG. 11 is a schematic structural diagram of a fixing seat.

FIG. 12 is a schematic structural diagram of a support rod.

FIG. 13 is a flow chart of a method for re-measuring the depth of underground boreholes in a coal mine.

The meanings of the numbers in the figure are: 1-shell, 2-tray, 3-jack, 4-side wing plate, 5-slide rail seat, 6-spring, 7-roller, 8-push rod cavity, 9-strain gauge, 10-fixed seat, 11-support rod, 12-roller shaft, 13-photoelectric encoder, 14-acquisition and controller.

101-shell body, 102-shell support plate, 103-collection and controller installation hole, 104-shell flange, 105-flange strip hole, 106-support rod through hole, 107-shell shaft through hole, 108-jack support plane, 109-tray installation slot, 110-shell wiring hole.

201-tray body, 202-arc-shaped boss, 203-tray step, 204-jack through hole, 205-lower spring hole, 206-tray wiring hole.

401-upper limit plate, 402-middle support plate, 403-lower mounting plate, side wing plate strip wiring hole 404-, side wing plate mounting hole 405-.

Slide rail seat body 501-, slide rail seat boss 502-, 503-groove, 504-upper spring hole, 505-first wiring hole of the slide rail seat, 506-second wiring hole of the slide rail seat, 507-third wiring hole of the slide rail seat, 508-wiring hole plug.

701- roller outer edge section, 702- roller center section.

1001-support rod mounting hole, 1002-fixed seat shaft through hole.

1101-external thread of the support rod, 1102-through hole of the support rod shaft.

The technical solution of the present invention is further described below in conjunction with embodiments.

Detailed ways

It should be noted that all parts and instruments used in the present invention, unless otherwise specified, are parts and instruments known in the art, such as:

The push rod adopts a conventional push rod (also called a push rod) known in the prior art, such as a push rod used for drilling depth remeasurement in the prior art, or a push rod connected with a control detection probe.

The photoelectric encoder 13 adopts a conventional photoelectric encoder known in the prior art.

The acquisition and controller 14 adopts a conventional acquisition and controller known in the prior art (also called data acquisition controller, acquisition controller, data acquisition control instrument, etc.).

In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

Embodiment 1:

The present embodiment provides a coal mine underground drilling depth re-measurement device, as shown in Figure 1, including a shell 1; the shell 1 includes a shell body 101, the shell body 101 is a hollow cylindrical structure, both longitudinal ends of the shell body 101 are open, and a shell support plate 102 is fixedly provided on the outer side wall of the shell body 101, and the shell support plate 102 is arranged along the longitudinal direction.

A tray 2 is installed at the bottom of the shell body 101, and multiple jacks 3 are arranged between the bottom surface of the tray 2 and the inner wall of the shell body 101, the bottom end of the jack 3 is installed on the shell body 101, and the top end of the jack 3 passes through the tray 2; a side wing plate 4 is installed on the top surface of the two lateral sides of the tray 2, respectively, and a pair of side wing plates 4 are arranged opposite to each other laterally, and a slide rail seat 5 is arranged between the lateral inner sides of the pair of side wing plates 4, and the slide rail seat 5 can move up and down along the vertical direction; a plurality of springs 6 are arranged between the bottom surface of the slide rail seat 5 and the top surface of the tray 2, the bottom end of the spring 6 is installed on the tray 2, and the top end of the spring 6 is fixedly installed on the slide rail seat 5, and the spring 6 is located on the outside of the top end of the jack 3.

A roller 7 is arranged inside the top of the shell body 101, and the space between the roller 7 and the slide rail seat 5 is a push rod cavity 8, and the push rod cavity 8 is used to set the push rod; a plurality of strain gauges 9 are arranged on the inner wall at the middle position of the slide rail seat 5, and the plurality of strain gauges 9 are evenly arranged along the longitudinal direction, the bottom surface of the strain gauge 9 is fixedly set on the slide rail seat 5, and the top surface of the strain gauge 9 is in contact with the push rod.

A fixed seat 10 is respectively provided at the longitudinal front and longitudinal rear of the shell body 101, and the fixed seat 10 is installed on the outer wall of the shell 1. A pair of support rods 11 are arranged in each fixed seat 10 along the vertical direction, and the top of the pair of support rods 11 is installed in the fixed seat 10, and a roller shaft 12 is arranged between the bottoms of the pair of support rods 11, and the roller 7 is fixedly installed on the roller shaft 12; the roller shaft 12 is arranged along the transverse direction, and one transverse end of the roller shaft 12 is rotatably installed in the support rod 11 close to the transverse left side, and the other transverse end of the roller shaft 12 passes through the support rod 11 close to the transverse right side, the shell body 101 and the fixed seat 10 in sequence, and the other transverse end of the roller shaft 12 is connected with a photoelectric encoder 13, and the photoelectric encoder 13 is arranged on the shell support plate 102.

As a specific solution of this embodiment, as shown in Figures 1 and 2, a collection and controller installation hole 103 is provided on the housing support plate 102 between the two photoelectric encoders 13, and a collection and controller 14 is installed in the collection and controller installation hole 103. The collection and controller 14 is connected to the photoelectric encoder 13, the jack 3, and the strain gauge 9. In this embodiment, the collection and controller 14 is used to record and collect the number of revolutions of the roller shaft 12, the pressure on the strain gauge 9, and control the extension and retraction of the telescopic rod of the jack 3.

As a specific solution of this embodiment, as shown in FIG2 , a housing flange 104 is fixed and coaxially arranged at the longitudinal rear end of the housing body 101, and a plurality of flange strip holes 105 are opened at the edge of the housing flange 104, and the plurality of flange strip holes 105 are evenly arranged along the circumferential direction of the housing flange 104. In this embodiment, the housing flange 104 can be matched with orifice flanges of various specifications of boreholes in coal mines through the flange strip holes 105.

As a specific solution of this embodiment, as shown in FIG2 , a pair of support rod through holes 106 are respectively provided on the longitudinal front portion and the longitudinal rear portion of the housing body 101, and the four support rod through holes 106 are symmetrically arranged in pairs, and the support rod through holes 106 are arranged in a one-to-one correspondence with the support rod mounting holes 1001. In this embodiment, the support rod through holes 106 are used for the support rod 11 to pass through the housing body 101.

As a specific solution of this embodiment, as shown in FIG2 , two housing shaft through holes 107 are provided on the housing body 101. In this embodiment, the housing shaft through holes 107 are used for the roller shaft 12 to pass through the housing body 101.

As a specific solution of this embodiment, as shown in FIG2 , a jack support plane 108 is provided in the middle of the bottom of the shell body 101, and tray mounting slots 109 are provided on the inner wall of the shell body 101 on both sides of the jack support plane 108. In this embodiment, the jack support plane 108 is used to set the jack 3, and the tray mounting slots 109 are used to install the tray 2.

As a specific solution of this embodiment, as shown in Fig. 2, a housing wiring hole 110 is provided on the housing body 101. In this embodiment, the housing wiring hole 110 is used to set the insulated wire of the strain gauge 9 and the control wire of the jack 3.

As a specific solution of this embodiment, as shown in FIG. 3 , the tray 2 includes a tray body 201 in the middle and two arc-shaped bosses 202 on the outside, and the arc-shaped bosses 202 and the tray body 201 are integrated; two tray steps 203 are arranged on the lower end surface of the tray body 201; the arc-shaped surface of the arc-shaped boss 202 matches the shape of the outer surface of the tray mounting slot 109. In this embodiment, the radius of the arc-shaped surface is the same as the radius of the circular arc where the tray mounting slot 109 is located, and the length of the tray mounting slot 109 is consistent with the length of the tray 2, so that the tray 2 can be closely matched with the tray mounting slot 109, thereby realizing the limited fixation of the tray 2 in the shell 1. After the tray body 201 is tightly installed in the shell 1, it can enclose a space with two horizontal sides closed with the shell 1.

As a specific solution of this embodiment, as shown in Figure 3, two jack through holes 204 are opened on the tray 2, the number of jacks 3 is two, the two jacks 3 are respectively located in the longitudinal front and longitudinal rear parts of the shell body 101, the telescopic rods at the top of the two jacks 3 respectively pass through the two jack through holes 204, and the bottom surfaces of the two jacks 3 are fixedly set on the jack support plane 108.

As a specific solution of this embodiment, as shown in Figure 3, sixteen lower spring holes 205 are provided on the top surface of the tray 2, and the sixteen lower spring holes 205 are symmetrically arranged in two rows and each row has eight. In this embodiment, the lower spring holes 205 are used to install the bottom of the spring 6.

As a specific solution of this embodiment, as shown in Fig. 3, a tray wiring hole 206 is provided on the tray 2. In this embodiment, the tray wiring hole 206 is used to set the control line of the jack 3.

As a specific solution of this embodiment, as shown in FIG4 , the side wing plate 4 includes an upper limit plate 401, a middle support plate 402 and a lower mounting plate 403. The structure composed of the upper limit plate 401, the middle support plate 402 and the lower mounting plate 403 is a Z-shaped structure, and the bottom surface of the upper limit plate 401 can contact the tray 2. In this embodiment, after the slide rail seat 5 is limited to the upper part of the tray 2 by the upper limit plates 401 of the two side wing plates 4, the spring 6 is in a compressed state and the upper end surface of the slide rail seat 5 is pressed against the upper limit plate 401. When the push rod passes through the roller 7 along the slide rail seat 5, the push rod squeezes the slide rail seat 5 so that the slide rail seat 5 moves vertically downward. The slide rail seat 5 and the two rollers 7 can ensure the stability of the push rod.

As a specific solution of this embodiment, as shown in FIG4 , a side wing strip-shaped wiring hole 404 is provided on the middle support plate 402. In this embodiment, the side wing strip-shaped wiring hole 404 is used to set the insulated wires of the strain gauge 9 and the control wires of the jack 3. The side wing strip-shaped wiring hole 404 is set in a strip shape, which can ensure that there is enough space for the wires and the control wires to pass through, and can ensure that the control wires will not be damaged due to the up and down movement of the slide rail seat 5.

As a specific solution of this embodiment, as shown in Fig. 4, a plurality of side wing plate mounting holes 405 are provided on the lower mounting plate 403. In this embodiment, bolts are installed in the side wing plate mounting holes 405, and the side wing plates 4 and the tray 2 are fixedly connected by the bolts and the side wing plate mounting holes 405.

As a specific solution of this embodiment, as shown in FIG. 5 and FIG. 6 , the rail seat 5 includes a rail seat body 501, on the top surface of which two rail seat bosses 502 are integrally arranged; the top surface of the rail seat body 501 on the lateral outer side is in contact with the top of the side wing plate 4; the inner wall in the middle of the rail seat body 501 and the inner wall of the rail seat boss 502 are provided with a plurality of grooves 503, and the grooves 503 are opened along the longitudinal direction. In this embodiment, the inner wall of the two rail seat bosses 502, the roller 7 and the space between the rail seat body 501 are the push rod cavity 8, and the grooves 503 make the bottom of the push rod cavity 8 have a concave-convex structure as a whole, which can effectively increase the friction between the push rod and the push rod, thereby preventing the rod from slipping.

As a specific solution of this embodiment, as shown in FIG8 , sixteen upper spring holes 504 are provided on the bottom surface of the slide rail seat 5, and the sixteen upper spring holes 504 are symmetrically arranged in two rows with eight holes in each row, and the lower spring holes 205 are arranged in a one-to-one correspondence with the upper spring holes 504. In this embodiment, the upper spring hole 504 is used to install the top of the spring 6, and after the spring 6 is installed through the upper spring hole 504 and the lower spring hole 205, it can ensure that the slide rail seat 5 is evenly stressed.

As a specific scheme of the present embodiment, as shown in Figures 7 and 8, a plurality of first wiring holes 505 of the slide rail seat are provided on the slide rail seat 5, and the first wiring holes 505 of the slide rail seat are provided along the vertical direction. The number of the first wiring holes 505 of the slide rail seat and the strain gauge 9 are both two, and the two strain gauges 9 are respectively located directly below the two rollers 7, and the two first wiring holes 505 of the slide rail seats are respectively located directly below the two strain gauges 9; a second wiring hole 506 of the slide rail seat is provided in the slide rail seat 5, and the second wiring hole 506 of the slide rail seat is provided along the longitudinal direction; a third wiring hole 507 of the slide rail seat is provided in the middle position of the slide rail seat 5, and the third wiring hole 507 of the slide rail seat is provided along the transverse direction; the first wiring hole 505 of the slide rail seat, the third wiring hole 507 of the slide rail seat are connected with the second wiring hole 506 of the slide rail seat. In this embodiment, the insulated wire of the strain gauge 9 is connected to the wiring terminal of the acquisition and controller 14 through the first wiring hole 505 of the slide rail seat, the second wiring hole 506 of the slide rail seat, the third wiring hole 507 of the slide rail seat, the strip-shaped wiring hole 404 of the side wing plate, and the wiring hole 110 of the shell. The control line of the jack 3 is connected to the wiring terminal of the acquisition and controller 14 through the tray wiring hole 206, the strip-shaped wiring hole 404 of the side wing plate, and the wiring hole 110 of the shell.

As a specific solution of this embodiment, as shown in Figure 5, a wiring hole plug 508 is inserted into the longitudinal front end of the second wiring hole 506 of the slide rail seat. In this embodiment, the wiring hole plug 508 plays a role in sealing and dustproofing the insulation guide.

As a specific scheme of this embodiment, as shown in Figures 9 and 10, the roller 7 includes two outer roller edge segments 701 and a middle roller center segment 702. The roller outer edge segments 701 and the roller center segment 702 are integrated. The surface of the roller outer edge segment 701 matches the shape of the top surface of the slide rail seat boss 502, and the surface of the roller center segment 702 matches the shape of the surface of the push rod. The surface of the roller center segment 702 is arc-shaped and can match the outer contour of the push rod of the same specification, so that the roller 7 can be replaced to adapt to push rods of different specifications.

As a specific solution of this embodiment, a threaded mounting hole is opened along the transverse direction at the center of the roller 7. In this embodiment, the roller 7 is fixedly connected to the roller shaft 12 through the threaded mounting hole.

As a specific solution of this embodiment, as shown in FIG11 , the fixing seat 10 is an arched structure as a whole, and the lower end surface of the fixing seat 10 matches the shape of the outer surface of the shell body 101; each fixing seat 10 is provided with a pair of support rod mounting holes 1001, and the support rod mounting holes 1001 are arranged along the vertical direction. In this embodiment, the support rod mounting holes 1001 are used to install the support rod 11, and the bottom of the support rod 11 passes through the support rod mounting holes 1001 and the support rod through holes 106 in sequence and then extends into the shell body 101.

As a specific solution of this embodiment, as shown in FIG11 , each fixing seat 10 is provided with a fixing seat shaft through hole 1002, and the fixing seat shaft through hole 1002 is the same size as the housing shaft through hole 107. In this embodiment, the fixing seat shaft through hole 1002 is used for the roller shaft 12 to pass through the fixing seat 10.

As a specific solution of this embodiment, as shown in FIG12 , the top of the support rod 11 is provided with a support rod external thread 1101, and the top of the support rod 11 is fixed to the upper end surface of the fixing seat 10 by a nut. In this embodiment, the length of the support rod 11 extending into the housing 1 is adjusted by adjusting the length of the nut screwed into the support rod external thread 1101, thereby adjusting the distance between the roller 7 and the slide rail seat 5.

As a specific solution of this embodiment, as shown in FIG12, a support rod shaft through hole 1102 is respectively provided at the bottom of each support rod 11, and a roller shaft 12 is rotatably installed in the support rod shaft through hole 1102 of the support rod 11 near the left side in the horizontal direction. In this embodiment, the other lateral end of the roller shaft 12 passes through the housing shaft through hole 107 of the support rod 11 near the right side in the horizontal direction, the housing shaft through hole 107 and the fixed seat shaft through hole 1002 at one time and then passes outward.

Embodiment 2:

This embodiment provides a method for retesting the depth of a borehole in a coal mine. As shown in FIG13 , the method is implemented by using the device for retesting the depth of a borehole in a coal mine in Example 1. The method specifically includes the following steps:

Step 1: Fix the coal mine underground drilling depth re-measurement device at the orifice flange of the measured borehole.

Step 2, insert the push rod into the push rod cavity 8, so that the push rod is fixed between the roller 7 and the slide rail seat 5; the strain gauge 9 can feel the downward pressure given by the push rod, and can judge whether the push rod has pressed the roller 7 and the slide rail seat 5 through the pressure. If it is judged that the push rod has not been pressed, the telescopic rod of the jack 3 is controlled to extend upward through the acquisition and controller 14, pushing the slide rail seat 5 to move upward until the push rod is in a pressed state.

Step three, when performing depth re-measurement or instrument observation, apply force to the push rod in the direction of drilling. Since the roller 7 and the slide rail seat 5 press the push rod, when the push rod is displaced by the external force on the slide rail seat 5, the roller 7 will rotate, and the roller shaft 12 will rotate synchronously, thereby driving the photoelectric encoder 13 to rotate.

Step 4: The upper and lower limits of the pressure threshold are pre-set in the acquisition and controller 14. During the pushing process, if the pressure value of the strain gauge 9 exceeds the set threshold range, the acquisition and controller 14 controls the jack 3 to produce an up and down displacement to adjust the compression state of the push rod.

Step 5. After one push rod completes pushing, connect another push rod to the tail of the previous push rod through a thread, and then continue pushing.

Step six, the photoelectric encoder 13 outputs a number of pulses during rotation to measure the rotation angle. Assume that the photoelectric encoder 13 outputs n pulses for each rotation, and the radius of the roller 7 is r. When the push rod produces a displacement of 2πr, the photoelectric encoder 13 outputs n pulses, that is, the measurement accuracy of the photoelectric encoder 13 is 2πr/n.

Step 7, the acquisition and controller 14 can respectively calculate the number of pulses output by the photoelectric encoders 13 connected to the two rollers 7, and obtain the actual measured value of the depth value after conversion. The depth values output by the two photoelectric encoders 13 measured at the same time are averaged, and the obtained value is the drilling depth. The above process can be expressed as follows:

Where:

D represents the drilling depth;

r represents the radius of the roller;

N ₁ represents the total number of pulses output by one of the photoelectric encoders;

n ₁ represents the number of pulses output by one of the photoelectric encoders when the push rod produces a displacement of 2πr;

N ₂ represents the total number of pulses output by another photoelectric encoder;

n ₂ represents the number of pulses output by another photoelectric encoder when the push rod produces a displacement of 2πr.

It can be seen from the above-mentioned embodiments 1 and 2 that the present invention aims at the depth information measurement of the handheld drilling observation instrument in the coal mine, and proposes to obtain the depth position data of the probe entering the borehole in real time during the observation process by measuring the displacement of the push rod connected to the tail end of the probe into the borehole. The measurement is simple to implement, no special person is required for operation, the data obtained is of high accuracy and resolution, the device structure and method can effectively prevent the push rod from slipping during use, and at the same time, the two sets of measurement data are processed and averaged to increase the accuracy of the measurement.

Claims (10)

1. The coal mine underground drilling depth retest device is characterized by comprising a shell (1); the shell (1) comprises a shell main body (101), both longitudinal ends of the shell main body (101) are open, a shell supporting plate (102) is fixedly arranged on the outer side wall of the shell main body (101), and the shell supporting plate (102) is arranged along the longitudinal direction;

A tray (2) is arranged in the bottom of the shell body (101), a plurality of jacks (3) are arranged between the bottom surface of the tray (2) and the inner wall of the shell body (101), the bottom ends of the jacks (3) are arranged on the shell body (101), and the top ends of the jacks (3) penetrate through the tray (2); the top surfaces of the two lateral sides of the tray (2) are respectively provided with a side wing plate (4), the pair of side wing plates (4) are transversely oppositely arranged, a slide rail seat (5) is arranged between the inner lateral sides of the pair of side wing plates (4), and the slide rail seat (5) can move up and down along the vertical direction; a plurality of springs (6) are arranged between the bottom surface of the slide rail seat (5) and the top surface of the tray (2), the bottom ends of the springs (6) are arranged on the tray (2), the top ends of the springs (6) are fixedly arranged on the slide rail seat (5), and the springs (6) are positioned on the outer side of the top ends of the jacks (3);

the top of the shell body (101) is internally provided with a roller (7), a space between the roller (7) and the sliding rail seat (5) is a push rod cavity (8), and the push rod cavity (8) is used for arranging a push rod; the inner wall of the middle position of the sliding rail seat (5) is provided with a plurality of strain gauges (9), the strain gauges (9) are uniformly distributed along the longitudinal direction, the bottom surface of the strain gauge (9) is fixedly arranged on the sliding rail seat (5), and the top surface of the strain gauge (9) is contacted with the push rod;

The shell comprises a shell body (101), wherein a fixed seat (10) is respectively arranged at the longitudinal front part and the longitudinal rear part of the shell body (101), the fixed seat (10) is arranged on the outer wall of the shell body (1), a pair of support rods (11) are arranged in each fixed seat (10) along the vertical direction, the tops of the pair of support rods (11) are arranged in the fixed seat (10), a roller rotating shaft (12) is arranged between the bottoms of the pair of support rods (11), and a roller (7) is fixedly arranged on the roller rotating shaft (12); the roller rotating shaft (12) is arranged along the transverse direction, one transverse end of the roller rotating shaft (12) is rotatably arranged in a supporting rod (11) close to the transverse left side, the other transverse end of the roller rotating shaft (12) sequentially penetrates through the supporting rod (11) close to the transverse right side, the shell body (101) and the fixing seat (10), the photoelectric encoder (13) is connected to the other transverse end of the roller rotating shaft (12), and the photoelectric encoder (13) is arranged on the shell supporting plate (102).

2. The underground coal mine drilling depth retest device according to claim 1, wherein a collecting and controller mounting hole (103) is formed in a shell supporting plate (102) between two photoelectric encoders (13), a collecting and controller (14) is mounted in the collecting and controller mounting hole (103), and the collecting and controller (14) is connected with the photoelectric encoders (13), the jack (3) and the strain gauge (9).

3. The underground coal mine drilling depth retest device according to claim 1, wherein a shell flange (104) is fixedly and coaxially arranged at the longitudinal rear end of the shell main body (101), a plurality of flange strip-shaped holes (105) are formed in the edge of the shell flange (104), and the flange strip-shaped holes (105) are uniformly distributed along the circumferential direction of the shell flange (104).

4. The underground coal mine drilling depth retest device according to claim 1, wherein the tray (2) comprises a middle tray main body (201) and two outer arc-shaped body bosses (202), and the arc-shaped body bosses (202) and the tray main body (201) are integrally arranged; two tray steps (203) are arranged on the lower end face of the tray main body (201).

5. The underground coal mine drilling depth retest device according to claim 1, wherein the side wing plate (4) comprises an upper limit plate (401), a middle support plate (402) and a lower mounting plate (403), and the bottom surface of the upper limit plate (401) can be contacted with the tray (2); the middle supporting plate (402) is provided with a side wing plate strip-shaped wiring hole (404).

6. The underground coal mine drilling depth retest device according to claim 1, wherein the sliding rail seat (5) comprises a sliding rail seat main body (501), two sliding rail seat bosses (502) are integrally arranged on the top surface of the sliding rail seat main body (501), and the top surface of the lateral outer side of the sliding rail seat main body (501) is contacted with the top of the side wing plate (4); the inner wall in the middle of the sliding rail seat main body (501) and the inner wall of the sliding rail seat boss (502) are provided with a plurality of grooves (503), and the grooves (503) are formed along the longitudinal direction.

7. The underground coal mine drilling depth retest device according to claim 1, wherein the roller (7) comprises two outer roller edge sections (701) and a middle roller center section (702), the outer roller edge sections (701) and the roller center section (702) are integrally arranged, the surface of the outer roller edge sections (701) is matched with the shape of the top surface of the boss (502) of the sliding rail seat, and the surface of the roller center section (702) is matched with the shape of the surface of the push rod.

8. The underground coal mine drilling depth retest device according to claim 1, wherein a pair of support rod mounting holes (1001) are respectively formed in each fixing seat (10), and the support rod mounting holes (1001) are arranged along the vertical direction.

9. The underground coal mine drilling depth retest device according to claim 1, wherein the top end of the supporting rod (11) is provided with a supporting rod external thread (1101), and the top end of the supporting rod (11) is fixed on the upper end face of the fixing seat (10) by a nut.

10. A method for retesting the depth of a coal mine underground borehole, which is characterized in that the method adopts the coal mine underground borehole depth retesting device as claimed in any one of claims 1 to 9 to measure the depth of the borehole; the drilling depth is calculated according to the following formula I:

wherein:

D represents the drilling depth;

r represents the minimum radius of the roller;

N ₁ represents the total number of pulses output by one of the opto-electronic encoders;

n ₁ represents the number of pulses output by one of the photoelectric encoders when the push rod generates displacement of 2rr; n ₂ represents the total number of pulses output by another photoelectric encoder;

n ₂ denotes the number of pulses output by another photoelectric encoder when the push rod is displaced by 2rr.