A monitoring system and method for drilling rod working status

Abstract

The present invention relates to a monitoring system and a monitoring method for the working status of a drill rod, and belongs to the technical field of drill rod monitoring. The monitoring system is arranged on the clamping head of the drilling rig, and comprises a power head displacement monitoring mechanism, a single-point position drill rod thread change monitoring mechanism, and a drill rod advance and retreat force direction monitoring mechanism. The power head displacement monitoring mechanism is arranged between the power head and the clamping head. The drill rod advance and retreat force direction monitoring mechanism comprises a shaft sleeve and a force measuring flange, the force measuring flange is fixed to the clamping head, and the shaft sleeve is fixed on the force measuring flange. The single-point position drill rod thread change monitoring mechanism comprises a rotating sleeve, the rotating sleeve is rotatably arranged on the outside of the shaft sleeve, an angle measuring component is arranged on the rotating sleeve, a connecting cylinder is fixedly arranged on the rotating sleeve, and an action ball is arranged on the connecting cylinder; the action ball is clamped into the spiral groove of the drill rod. The problem that the number of drill rods driven into the well is prone to error is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of drill rod monitoring, and in particular relates to a monitoring system and a monitoring method for the working state of a drill rod. Background Art

[0002] A large number of boreholes need to be constructed when mining coal seams underground, especially for protruding mines. Constructing extraction boreholes of qualified quality is an important factor in ensuring safe production in coal mines. Existing drilling construction in coal mines is generally completed by 2-3 drillers using a drilling rig to drive drill rods into the coal rock layer. The depth of the borehole is obtained by counting the number of drill rods and multiplying it by the length of a single drill rod. This method is severely limited by the operational quality of the on-site drillers. If the on-site drillers make mistakes in counting the drill rods, it is easy to judge a borehole with insufficient depth as a qualified borehole. For such boreholes with insufficient depth, the effect of gas extraction in the later stage will be seriously affected, leaving a huge safety hazard for coal mine production. Therefore, a monitoring system for the working status of drill rods is needed to accurately count the number of drill rods driven in, and to detect in time when the working status of the drill rods is abnormal, so as to remind the staff to deal with it. Summary of the Invention

[0003] The present invention overcomes the shortcomings of the prior art and proposes a monitoring system and method for the working status of a drill rod, thereby solving the problem that errors are easily made in the statistics of the number of drill rods driven into a well during downhole drilling.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0005] A system for monitoring the working status of a drill rod is arranged on the clamping head of a drilling rig, and includes a power head displacement monitoring mechanism, a single-point position drill rod thread change monitoring mechanism, and a drill rod advance and retreat force direction monitoring mechanism; the power head displacement monitoring mechanism is arranged between the power head and the clamping head; the drill rod advance and retreat force direction monitoring mechanism includes a shaft sleeve and a force measuring flange, the force measuring flange is fixedly arranged on the clamping head, and the shaft sleeve is fixedly arranged on the force measuring flange; the single-point position drill rod thread change monitoring mechanism includes a rotating sleeve, the rotating sleeve is rotatably arranged on the outside of the shaft sleeve, an angle measuring assembly is arranged on the rotating sleeve, two connecting tubes are fixedly arranged on the rotating sleeve, and an action ball is arranged on the connecting tube; one end of the drill rod is fixed on the power head, the other end of the drill rod passes through the clamping head and the shaft sleeve, and the action ball is clamped into the spiral groove of the drill rod.

[0006] Furthermore, the force measuring flange includes an outer ring, an inner ring, and a sensor body. The sensor body is arranged between the outer ring and the inner ring. The outer ring is fixedly arranged on the end face of the drilling rig's clamping head away from the power head. The sleeve is fixedly arranged on the end face of the inner ring of the force measuring flange away from the clamping head. The sleeve is a cylindrical structure with openings at both ends.

[0007] Furthermore, the angle measurement component includes a Hall sensor and a magnetic sheet. A circle of magnetic sheets arranged in a circular array is fixedly provided on the outer cylindrical surface of the rotating sleeve; a control box is fixedly provided on the force measuring flange, and a Hall sensor is fixedly provided on the control box. The detection direction of the Hall sensor is toward one side of the magnetic sheet.

[0008] Furthermore, two symmetrical connecting rods are fixedly provided on the outer cylindrical surface of the rotating sleeve, and a connecting tube is fixedly provided on each end of the two connecting rods away from the rotating sleeve. The connecting tube is a cylindrical structure with openings at both ends. One end of the connecting tube is opened as an action ball mounting hole, and the inner diameter of the action ball mounting hole is equal to the inner diameter of the connecting tube; the other end of the connecting tube is opened as a bolt mounting hole, and the inner diameter of the bolt mounting hole is smaller than the inner diameter of the connecting tube; the action ball mounting holes of the two connecting tubes face each other.

[0009] Furthermore, a ball seat and a spring are respectively provided inside each connecting tube; the ball seat is provided at the action ball mounting hole of the connecting tube, and the ball seat includes a coaxial large diameter section and a small diameter section, the large diameter section is located at the action ball mounting hole of the connecting tube, and the small diameter section is located on the inner side of the connecting tube, and an action ball is rollingly provided on the end face of the large diameter section away from the small diameter section, and the outer end of the action ball is located on the outside of the action ball mounting hole; a threaded hole is provided on the end face of the small diameter section away from the large diameter section, and the end of the small diameter section away from the large diameter section extends into the bolt mounting hole of the connecting tube; the spring is sleeved on the outer side of the small diameter section of the ball seat, and the two ends of the spring are respectively in contact with the large diameter section and the inner wall of the connecting tube; the bolt extends from the bolt mounting hole of the connecting tube and is screwed into the threaded hole of the small diameter section of the ball seat, thereby connecting the ball seat with the connecting tube.

[0010] Furthermore, the power head displacement monitoring mechanism is a pull-wire encoder, and a control box is fixedly installed on the force measuring flange. The pull-wire box of the pull-wire encoder is fixedly installed on the control box, the pull-wire terminal of the pull-wire encoder is fixedly installed on the power head, and the pull wire of the pull-wire encoder is extended along the axial direction of the drill rod.

[0011] A monitoring method of a drill pipe working status monitoring system comprises the following steps:

[0012] The S1 power head pushes the drill rod into the borehole:

[0013] S1.1 Secure the end of the previous drill pipe section to the clamping head, secure the new drill pipe section to the power head, and connect the new drill pipe section to the previous drill pipe section; measure the drilling direction of the drill bit, compare the measured drilling direction value with the designed value, and control the power head to rotate the drill pipe forward based on the comparison result, adjusting the angular direction of the drill pipe. The drill pipe drives the drill bit to rotate forward so that the measured drilling direction value of the drill bit corresponds to the designed value; during the forward rotation of the drill pipe, use the angle measurement component to measure the angle of the forward rotation of this drill pipe section, thereby determining the angular direction adjustment corresponding to this drill pipe section;

[0014] S1.2 The power head slides forward on the work platform of the drilling rig, driving the drill pipe forward. After the drill pipe is pushed a set distance by the power head, the clamping head clamps the drill pipe, then the power head releases the drill pipe and retreats to its initial position. After returning to its initial position, the power head re-clamps the drill pipe, and the clamping head releases the drill pipe. The power head continues to push the drill pipe forward a set distance, then the clamping head again clamps the drill pipe, releases the drill pipe again, and retreats to its initial position. After multiple pushes by the power head, the drill pipe section is fully pushed into the borehole, and the clamping head clamps the drill pipe again, releases the drill pipe again, and retreats to its initial position.

[0015] S1.3 Secure the next section of drill pipe to the power head and repeat steps S1.1 and S1.2 above, pushing the next section of drill pipe completely into the borehole and connecting it to the previous section. Repeat this process until the drill pipe has drilled the drill bit to the designed depth.

[0016] S1.4 The power head displacement monitoring mechanism measures the displacement of the power head each time it advances forward, and the measured displacement of the power head each time it advances forward is added to the total displacement measured by the power head displacement monitoring mechanism. During the drill rod advancement process, the power head does not rotate the drill rod; the drill rod merely advances along its axis with the power head. The total forward displacement of the drill rod is measured by the single-point drill rod thread change monitoring mechanism.

[0017] S1.5 During the process of advancing all drill rods into the borehole, if the power head advances but the force-measuring flange does not detect any forward pulling force, it indicates that the drill rod is not moving forward or the drill rod is disconnected from the single-point drill rod thread change monitoring mechanism. The monitoring system will sound an alarm and the drilling rig needs to be inspected. If the drill rod is not moving forward, it indicates that the power head is disconnected from the drill rod and needs to be reattached. If the drill rod is moving forward, it indicates that the drill rod is disconnected from the single-point drill rod thread change monitoring mechanism and needs to be reconnected.

[0018] S1.6 During the process of all drill rods being advanced into the borehole, a period of time is randomly selected, and the displacement measured by the power head displacement monitoring mechanism during this period is compared with the displacement of the drill rod measured by the single-point drill rod thread change monitoring mechanism. If the difference between the two is within the set error range, it indicates that the displacement of the drill rod measured by the power head displacement monitoring mechanism during this period is the actual displacement of the drill rod. If the displacement measured by the power head displacement monitoring mechanism is greater than the displacement of the drill rod measured by the single-point drill rod thread change monitoring mechanism and exceeds the set error range, it indicates that the power head and the drill rod are not firmly fixed during this period, and the actual displacement of the power head is greater than the displacement of the drill rod driven by the power head, and the monitoring system will alarm. If the displacement measured by the power head displacement monitoring mechanism is less than the displacement of the drill rod measured by the single-point drill rod thread change monitoring mechanism and exceeds the set error range, it indicates that the power head displacement monitoring mechanism has failed during this period and is unable to count each forward movement of the power head, and the monitoring system will alarm.

[0019] S1.7 When all the drill rods are advanced into the borehole, randomly select a period of time and check the statistical data of the angular direction adjustment of the drill rods during this period of time, so as to determine which section of the drill rod has undergone angular direction adjustment and the angular direction adjustment amount of this section of the drill rod;

[0020] The S2 power head pulls the drill rod out of the borehole:

[0021] S2.1 The clamping head releases the drill rod, the power head fixes the outermost section of the drill rod, and the power head drives the drill rod to slide backward, thereby driving the drill rod to be pulled out as a whole. After the drill rod is pulled out by the power head by a set displacement, the clamping head clamps the drill rod, and then the power head releases the drill rod and slides forward to the frontmost position. The power head that has slid forward to the frontmost position re-clamps the drill rod, and the clamping head releases the drill rod; the power head continues to pull the drill rod backward by a set displacement, and then the clamping head clamps the drill rod again, and the power head again releases the drill rod and slides forward to the frontmost position. After multiple withdrawals of the power head, the outermost section of the drill rod is completely withdrawn to the outside of the borehole, and the outermost section of the drill rod is removed. The clamping head then clamps the drill rod again, and the power head again releases the drill rod and slides forward to the frontmost position.

[0022] S2.2 Secure the next section of drill pipe to the power head and repeat step S2.1 above to pull the next section of drill pipe out of the borehole and remove it. Repeat this process until all drill pipes are pulled out of the borehole and removed.

[0023] S2.3 The displacement of the power head each time it slides backward is measured by the power head displacement monitoring mechanism, and the measured displacement of each backward slide is added to the total displacement measured by the power head displacement monitoring mechanism. During the drill rod withdrawal process, the power head does not rotate the drill rod; the drill rod is simply withdrawn along its axis with the power head. The total displacement of the drill rod during withdrawal is measured by the single-point drill rod thread change monitoring mechanism.

[0024] S2.4 During the process of withdrawing all the drill rods to the outside of the borehole, if the power head slides backward and the force-measuring flange does not detect any backward pressure, it indicates that the drill rod has not moved backward or the drill rod is disconnected from the single-point drill rod thread change monitoring mechanism. The monitoring system will alarm and the drilling rig needs to be inspected. If the drill rod has not moved backward, it indicates that the power head is disconnected from the drill rod and needs to be reattached. If the drill rod is moving backward, it indicates that the drill rod is disconnected from the single-point drill rod thread change monitoring mechanism and needs to be reconnected.

[0025] S2.5 During the process of all drill rods being pulled out of the borehole, a period of time is randomly selected, and the displacement measured by the power head displacement monitoring mechanism during this period of time is compared with the displacement of the drill rod measured by the single-point position drill rod thread change monitoring mechanism. If the difference between the two is within the set error range, it indicates that the displacement of the drill rod measured by the power head displacement monitoring mechanism during this period of time is the actual displacement of the drill rod; if the displacement measured by the power head displacement monitoring mechanism is greater than the displacement of the drill rod measured by the single-point position drill rod thread change monitoring mechanism and exceeds the set error range, it indicates that the power head and the drill rod are not firmly fixed during this period of time, and the actual displacement of the power head is greater than the displacement of the drill rod driven by the power head, and the monitoring system will alarm; if the displacement measured by the power head displacement monitoring mechanism is less than the displacement of the drill rod measured by the single-point position drill rod thread change monitoring mechanism and exceeds the set error range, it indicates that the power head displacement monitoring mechanism has failed during this period of time and cannot count each backward movement of the power head, and the monitoring system will alarm.

[0026] Furthermore, in steps S1.4 and S1.5, when the drill rod is advanced into the borehole, the drill rod is engaged with the action ball through the spiral groove on its outer side, giving the action ball on the connecting tube a forward movement tendency. The action ball transmits this forward movement tendency to the force-measuring flange through the connecting tube, the rotating sleeve and the shaft sleeve. The force-measuring flange detects that it is being pulled forward by the shaft sleeve at this time, and the force-measuring flange is subjected to the forward tension, thereby detecting the working state of "the drill rod is advanced into the borehole"; since the shaft sleeve is connected to the force-measuring flange, the shaft sleeve cannot move axially relative to the force-measuring flange. When the drill rod is advanced forward, the spiral groove on the outer side of the drill rod drives the two connecting tubes to rotate in opposite directions around the axis of the drill rod through the action ball, and the two connecting tubes drive the rotating sleeve to rotate in opposite directions through the connecting rod. The angle of the rotating sleeve rotated in the opposite direction is obtained by the angle measuring component, and the displacement value of the drill rod is obtained by the angle of the rotating sleeve rotated in the opposite direction and the pitch of the spiral groove on the outer side of the drill rod.

[0027] Furthermore, in steps S2.3 and S2.4, when the drill rod is pulled out of the borehole, the spiral groove on the outside of the drill rod engages with the action ball, giving the action ball on the connecting tube a backward movement tendency. The action ball transmits this backward movement tendency to the force-measuring flange through the connecting tube, the rotating sleeve, and the shaft sleeve. The force-measuring flange detects that it is being pushed backward by the shaft sleeve at this time, and the force-measuring flange is subjected to the backward thrust, thereby detecting the working state of "the drill rod being pulled out of the borehole"; since the shaft sleeve is connected to the force-measuring flange, the shaft sleeve cannot move axially relative to the force-measuring flange. When the drill rod is retracted, the spiral groove on the outside of the drill rod drives the two connecting tubes to rotate forward around the axis of the drill rod through the action ball, and the two connecting tubes drive the rotating sleeve to rotate forward through the connecting rod. The angle of the rotating sleeve's forward rotation is obtained by the angle measuring component, and the displacement value of the drill rod is obtained by the angle of the rotating sleeve's forward rotation and the pitch of the spiral groove on the outside of the drill rod.

[0028] Furthermore, in step S1.1, when the drill rod rotates forward, the drill rod does not move along its axial direction, so the drill rod does not give the action ball on the connecting tube a tendency to move forward or backward, then the force measuring flange is not subjected to the forward or backward pulling pressure of the sleeve, indicating that the drill rod does not move along its axial direction; the drill rod drives the two connecting tubes to rotate forward around the drill rod axis through the mutual engagement of the spiral groove on its outer side and the action ball, and the two connecting tubes drive the rotating sleeve to rotate forward through the connecting rod, and the angle measuring component is used to detect that the rotating sleeve is rotating forward, thereby detecting the working state of "the drill rod is adjusting the angular direction"; and the angle of rotation of the rotating sleeve is obtained through the angle measuring component, and the angle of rotation of the rotating sleeve is the angle of rotation of the drill rod.

[0029] The beneficial effects of the present invention compared to the prior art are:

[0030] The present invention provides a monitoring system and a monitoring method for the working status of a drill rod. The system monitors the movement status of the power head through a power head displacement monitoring mechanism, and can also monitor the movement distance of the power head; monitors the action status of the drill rod through a drill rod advance and retreat force direction monitoring mechanism, and can obtain in real time whether the drill rod is advancing, retreating or staying in place; monitors the advance and retreat distance of the drill rod through a single-point position drill rod thread change monitoring mechanism, thereby ensuring that there is no error in the statistical calculation of the number of drill rods driven in; through the mutual cooperation of the power head displacement monitoring mechanism, the single-point position drill rod thread change monitoring mechanism, and the drill rod advance and retreat force direction monitoring mechanism, the working status of the drill rod can be monitored in real time, not only can the number of drill rods driven in and the number of drill rods withdrawn be counted, but also the connection status between the drill rod and the power head can be monitored, thereby ensuring full status monitoring of the drill rod when working, and eliminating errors caused by human statistics. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described in detail below with reference to the accompanying drawings:

[0032] Figure 1 It is a three-dimensional schematic diagram of the present invention as a whole Figure 1 ;

[0033] Figure 2 It is a three-dimensional schematic diagram of the present invention as a whole Figure 2 ;

[0034] Figure 3 yes Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0035] Figure 4 It is a side view of the present invention as a whole;

[0036] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0037] Figure 6 It is a schematic diagram of the section between the drill rod thread change monitoring mechanism at a single point, the drill rod forward and backward force direction monitoring mechanism, and the drill rod;

[0038] Figure 7 It is a three-dimensional schematic diagram of the rotating sleeve;

[0039] Among them, 1 is the power head, 2 is the clamping head, 3 is the drill rod forward and backward force direction monitoring mechanism, 4 is the single-point position drill rod thread change monitoring mechanism, 5 is the drill rod, 6 is the power head displacement monitoring mechanism, 7 is the control box, 301 is the shaft sleeve, 302 is the force measuring flange, 401 is the rotating sleeve, 402 is the Hall sensor, 403 is the magnetic plate, 404 is the connecting rod, 405 is the connecting tube, 406 is the action ball, 407 is the spring, 408 is the bolt, 409 is the ball seat, 501 is the spiral groove, 601 is the pull rope encoder, 602 is the pull rope, and 603 is the pull rope terminal. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0041] like Figure 1 As shown in FIG7 , the present invention provides a monitoring system and a monitoring method for the working status of a drill rod. The monitoring system is arranged on the clamping head 2 of the drilling rig, and includes a power head displacement monitoring mechanism 6, a single-point position drill rod thread change monitoring mechanism 4, and a drill rod forward and backward force direction monitoring mechanism 3.

[0042] The drill rod advance and retreat force direction monitoring mechanism 3 includes a sleeve 301 and a force measuring flange 302 .

[0043] The force measuring flange 302 includes an outer ring, an inner ring, and a sensor body. The sensor body is arranged between the outer ring and the inner ring. The outer ring is fixedly arranged on the end surface of the drilling rig's clamping head 2 away from the power head 1.

[0044] A shaft sleeve 301 is fixedly provided on the end surface of the inner ring of the force measuring flange 302 away from the clamping head 2. The shaft sleeve 301 is a cylindrical structure with two ends open.

[0045] A control box 7 is also fixed to the drill rod forward and backward force direction monitoring mechanism 3. It is fixed to the upper end of the outer ring of the force-measuring flange 302, and the front end of the control box 7 extends forward to above the front end of the sleeve 301. The wiring harness of the force-measuring flange 302 extends into the interior of the control box 7 and is electrically connected to the controller inside the control box 7.

[0046] The force measuring flange 302 is ARIZON brand 1189 model.

[0047] The single-point drill pipe thread change monitoring mechanism 4 includes a rotating sleeve 401 , an angle measuring assembly, a connecting rod 404 , a connecting tube 405 , an action ball 406 , a ball seat 409 , a spring 407 , and a bolt 408 .

[0048] A rotating sleeve 401 is rotatably connected to the outer side of the distal end of the shaft sleeve 301 via a bearing, and an angle measuring component is provided on the rotating sleeve 401 .

[0049] The angle measurement assembly includes a Hall effect sensor 402 and magnetic discs 403. A circular array of magnetic discs 403 is fixedly mounted on the outer cylindrical surface of the rotating sleeve 401. A Hall effect sensor 402 is fixedly mounted on the front end of the lower end face of the control box 7. The detection direction of the Hall effect sensor 402 is vertically downward, toward the side of the magnetic discs 403. The wiring harness of the Hall effect sensor 402 is electrically connected to the controller inside the control box 7. When the rotating sleeve 401 rotates relative to the shaft sleeve 301, the rotating sleeve 401 drives the outer circle of magnetic discs 403 to rotate as well. The Hall effect sensor 402 detects the number of magnetic discs 403 that pass by, thereby determining the angle of rotation of the rotating sleeve 401.

[0050] Two symmetrical connecting rods 404 are fixedly mounted on the outer cylindrical surface of the rotating sleeve 401. The length of the connecting rods 404 is arranged along the axial direction of the rotating sleeve 401, and the ends of the connecting rods 404 away from the rotating sleeve 401 extend away from the clamping head 2. A connecting tube 405 is fixedly mounted on each end of the connecting rods 404 away from the rotating sleeve 401. The two connecting tubes 405 are symmetrically arranged, and the axes of the two connecting tubes 405 are perpendicular to the axis of the rotating sleeve 401.

[0051] The connecting tube 405 is a cylindrical structure with two openings at both ends. One end of the connecting tube 405 is an opening for a ball mounting hole, the inner diameter of which is equal to the inner diameter of the connecting tube 405. The other end of the connecting tube 405 is an opening for a bolt mounting hole, the inner diameter of which is smaller than the inner diameter of the connecting tube 405. The ball mounting holes of the two connecting tubes 405 face each other. Each connecting tube 405 is provided with a ball seat 409 and a spring 407. The ball seat 409 is mounted within the ball mounting hole of the connecting tube 405. The ball seat 409 comprises a coaxial large-diameter section and a small-diameter section. The large-diameter section is positioned within the ball mounting hole of the connecting tube 405, while the small-diameter section is positioned inside the connecting tube 405. An operating ball 406 is rollably mounted on the end face of the large-diameter section facing away from the small-diameter section, with the outer end of the operating ball 406 positioned outside the ball mounting hole. A threaded hole is provided on the end face of the small-diameter section facing away from the large-diameter section, and the end of the small-diameter section facing away from the large-diameter section extends into the bolt mounting hole of the connecting tube 405. A spring 407 is sleeved onto the outer side of the small-diameter section of the ball seat 409, with its ends contacting the large-diameter section and the inner wall of the connecting tube 405, respectively. A bolt 408 extends from the bolt mounting hole of the connecting tube 405 and screws into the threaded hole of the small-diameter section of the ball seat 409, thereby connecting the ball seat 409 to the connecting tube 405.

[0052] One end of the drill rod 5 is fixed to the power head 1. The other end of the drill rod 5 passes through the clamping head 2 and the sleeve 301. The outer ends of the operating balls 406 on the two connecting tubes 405 are respectively engaged within the two spiral grooves 501 of the drill rod 5. The two spiral grooves 501 of the drill rod 5 are arranged 180 degrees apart. The spring 407 inside the connecting tube 405 ensures that the operating balls 406 are pressed tightly against the spiral grooves 501 of the drill rod 5.

[0053] When the drill rod 5 is pushed into the borehole, the spiral groove 501 on the outer side of the drill rod 5 is engaged with the action ball 406, giving the action ball 406 on the connecting tube 405 a forward movement trend. The action ball 406 transmits this forward movement trend to the force measuring flange 302 through the connecting tube 405, the rotating sleeve 401, and the shaft sleeve 301. The force measuring flange 302 detects that it is being pulled forward by the shaft sleeve 301 at this time. The force measuring flange 302 is subjected to the forward pulling force, thereby detecting the working state of "the drill rod 5 is pushed into the borehole". Since the sleeve 301 is connected to the force-measuring flange 302, the sleeve 301 cannot move axially relative to the force-measuring flange 302. When the drill rod 5 is advanced, the spiral groove 501 on the outside of the drill rod 5 drives the two connecting tubes 405 to rotate in opposite directions around the axis of the drill rod 5 through the action ball 406. The two connecting tubes 405 drive the rotating sleeve 401 to rotate in opposite directions through the connecting rod 404. The angle of the rotating sleeve 401 rotated in opposite directions is obtained through the angle measuring component. The displacement value of the drill rod 5 is obtained through the angle of the rotating sleeve 401 rotated in opposite directions and the pitch of the spiral groove 501 on the outside of the drill rod 5. The displacement value in this process is the displacement value of the drill rod 5 advanced into the borehole.

[0054] That is, the force-measuring flange 302 detects the forward pulling force, and the angle-measuring assembly detects the angle change, which proves that the power head 1 is driving the drill rod 5 to advance into the borehole.

[0055] When the drill rod 5 is pulled out of the borehole, the spiral groove 501 on the outer side of the drill rod 5 is engaged with the action ball 406, giving the action ball 406 on the connecting tube 405 a backward movement tendency. The action ball 406 transmits this backward movement tendency to the force measuring flange 302 through the connecting tube 405, the rotating sleeve 401, and the shaft sleeve 301. The force measuring flange 302 detects that it is being pushed backward by the shaft sleeve 301 at this time. The force measuring flange 302 is subjected to the backward thrust, thereby detecting the working state of "the drill rod 5 is pulled out of the borehole". Since the sleeve 301 is connected to the force-measuring flange 302, the sleeve 301 cannot move axially relative to the force-measuring flange 302. When the drill rod 5 retracts, the spiral groove 501 on the outside of the drill rod 5 drives the two connecting tubes 405 to rotate forward around the axis of the drill rod 5 through the action ball 406. The two connecting tubes 405 drive the rotating sleeve 401 to rotate forward through the connecting rod 404. The angle of the rotating sleeve 401 rotated forward is obtained through the angle measuring component. The displacement value of the drill rod 5 is obtained through the angle of the rotating sleeve 401 rotated forward and the pitch of the spiral groove 501 on the outside of the drill rod 5. The displacement value in this process is the displacement value of the drill rod 5 pulled out of the borehole.

[0056] That is, the force-measuring flange 302 detects the backward pressure, and the angle-measuring assembly detects the angle change, which proves that the power head 1 is driving the drill rod 5 to be drawn out of the borehole.

[0057] When the drilling direction of the drill bit needs to be adjusted, the power head 1 is used to drive the drill rod 5 to rotate forward, adjusting the angular direction of the drill rod 5. The drill rod 5 then drives the drill bit to rotate forward, thereby ensuring that the drilling direction of the drill bit conforms to the designed value. When the drill rod 5 rotates forward, it does not move along its axial direction. Therefore, the drill rod 5 does not exert any forward or backward movement on the active ball 406 on the connecting tube 405. As a result, the force-measuring flange 302 is not subjected to any forward or backward pulling pressure from the sleeve 301, indicating that the drill rod 5 has not moved along its axial direction. The drill rod 5 drives the two connecting tubes 405 to rotate forward around the axis of the drill rod 5 through the mutual engagement of the spiral groove 501 on its outer side and the working ball 406. The two connecting tubes 405 drive the rotating sleeve 401 to rotate forward through the connecting rod 404. The angle measuring component detects that the rotating sleeve 401 is rotating forward, thereby detecting the working state of "the drill rod 5 is adjusting its angle direction"; and the angle measuring component is used to obtain the angle of rotation of the rotating sleeve 401, which is the angle of rotation of the drill rod 5, and the angle of rotation of the drill rod 5 is the angle of adjustment of the drill bit.

[0058] The portion of the drill rod 5 on the side of the clamping head 2 away from the power head 1 can only exist in three states: forward, backward, and forward rotation (used to adjust the angular direction of the drill rod 5). When the drill rod 5 advances, it drives the rotating sleeve 401 to rotate in the reverse direction; when the drill rod 5 retreats, it drives the rotating sleeve 401 to rotate forward; and when the drill rod 5 adjusts its angular direction, it drives the rotating sleeve 401 to rotate forward. To determine whether the drill rod 5 is retreating or adjusting its angular direction when the rotating sleeve 401 is rotating forward, it is necessary to determine based on the force-measuring flange 302. When the force-measuring flange 302 detects a backward thrust, it indicates that the drill rod 5 is retreating; when the force-measuring flange 302 detects no tension or pressure, it indicates that the drill rod 5 is adjusting its angular direction.

[0059] The power head displacement monitoring mechanism 6 is a drawstring encoder 601. The drawstring box of the drawstring encoder 601 is fixedly mounted on the upper end of the control box 7. The drawstring terminal 603 of the drawstring encoder 601 is fixedly mounted on the power head 1. The drawstring 602 of the drawstring encoder 601 extends along the axial direction of the drill rod 5. The wiring harness of the drawstring encoder 601 is electrically connected to the controller inside the control box 7. The drawstring encoder 601 adopts the existing technology, namely "CN218724237U - A drawstring encoder suitable for long distances".

[0060] When the power head 1 moves forward or backward, the power head 1 controls the pull rope 602 to be pulled outward or retracted inward, and the movement displacement of the power head 1 is monitored by detecting the movement amount of the pull rope 602.

[0061] The power head displacement monitoring mechanism 6 may also adopt a displacement sensor, which is arranged between the power head 1 and the working platform of the drilling rig to monitor the movement displacement of the power head 1 through the displacement sensor.

[0062] When the power head 1 and the drill rod 5 are fixed, the displacement of the power head 1 while holding the drill rod 5, as measured by the power head displacement monitoring mechanism 6, is the actual displacement of the drill rod 5. When the power head 1 moves, if the force-measuring flange 302 detects tension or pressure, and the single-point drill rod thread change monitoring mechanism 4 detects a change in the displacement of the drill rod 5, it can be determined that the power head 1 is holding the drill rod and moving. If the force-measuring flange 302 does not detect tension or pressure, and the single-point drill rod thread change monitoring mechanism 4 does not detect a change in the displacement of the drill rod 5, it can be determined that the power head 1 is not holding the drill rod while moving.

[0063] Since the length of a section of drill rod 5 is fixed, when a section of drill rod 5 is pushed into the borehole or pulled out of the borehole by the power head 1, the power head displacement monitoring mechanism 6 detects that the movement displacement of the power head 1 should correspond to the length of the section of drill rod 5. At the same time, the displacement of the drill rod 5 detected by the single-point position drill rod thread change monitoring mechanism 4 also corresponds to the length of the drill rod 5. The accuracy of the displacement measured by the power head displacement monitoring mechanism 6 is verified by the displacement of the drill rod 5 detected by the single-point position drill rod thread change monitoring mechanism 4.

[0064] The present invention provides a monitoring method for a drill pipe working status monitoring system, comprising the following steps:

[0065] S1 The power head 1 pushes the drill rod 5 into the borehole:

[0066] S1.1 Fix the end of the previous drill rod 5 to the clamping head 2, fix the new drill rod 5 to the power head 1, and connect the new drill rod 5 to the previous drill rod 5; measure the drilling direction of the drill bit, compare the measured drilling direction value of the drill bit with the designed value, and control the power head 1 to rotate the drill rod 5 forward based on the comparison result, adjust the angular direction of the drill rod 5, and drive the drill rod 5 to rotate forward so that the measured drilling direction value of the drill bit corresponds to the designed value; during the forward rotation of the drill rod 5, the angle of the forward rotation of the drill rod 5 is measured by the angle measurement component, thereby determining the angular direction adjustment amount corresponding to the drill rod 5;

[0067] S1.2 The power head 1 slides forward on the working platform of the drilling rig, driving the drill rod 5 forward. After the drill rod 5 is pushed by the power head 1 to a set displacement, the clamping head 2 clamps the drill rod 5. The power head 1 then releases the drill rod 5 and retreats to its initial position. The power head 1, having returned to its initial position, re-clamps the drill rod 5, and the clamping head 2 releases the drill rod 5. The power head 1 continues to push the drill rod 5 forward to a set displacement, and the clamping head 2 clamps the drill rod 5 again. The power head 1 again releases the drill rod 5 and retreats to its initial position. After multiple pushes by the power head 1, the drill rod 5 is completely pushed into the borehole. The clamping head 2 then clamps the drill rod 5 again, and the power head 1 again releases the drill rod 5 and retreats to its initial position.

[0068] S1.3 Fix the next section of drill rod 5 to the power head 1 and repeat the above steps S1.1 and S1.2 to push the next section of drill rod 5 into the borehole and connect it to the previous section of drill rod 5. Repeat this process until the drill rod 5 drills the drill bit to the designed depth.

[0069] S1.4 The displacement of the power head 1 at each forward advance is measured by the power head displacement monitoring mechanism 6 and is added to the total displacement measured by the power head displacement monitoring mechanism 6. During the advancement of the drill rod 5, the power head 1 does not rotate the drill rod 5; the drill rod 5 merely advances along its axis with the power head 1. The total forward displacement of the drill rod 5 is measured by the single-point drill rod thread change monitoring mechanism 4.

[0070] S1.5 During the process of all the drill rods 5 being advanced into the borehole, if the power head 1 advances forward but the force-measuring flange 302 does not detect any forward pulling force, it indicates that the drill rod 5 is not moving forward or that the drill rod 5 is disconnected from the single-point drill rod thread change monitoring mechanism 4. The monitoring system will sound an alarm and the drilling rig needs to be inspected. If the drill rod 5 is not moving forward, it indicates that the power head 1 is disconnected from the drill rod 5 and the power head 1 and the drill rod 5 need to be reattached. If the drill rod 5 is moving forward, it indicates that the drill rod 5 is disconnected from the single-point drill rod thread change monitoring mechanism 4 and the drill rod 5 needs to be reconnected to the single-point drill rod thread change monitoring mechanism 4.

[0071] S1.6 In the process of all the drill rods 5 being advanced into the borehole, a period of time is randomly selected, and the displacement measured by the power head displacement monitoring mechanism 6 during this period of time is compared with the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4. If the difference between the two is within the set error range, it indicates that the displacement of the drill rod 5 measured by the power head displacement monitoring mechanism 6 during this period of time is the actual displacement of the drill rod 5; if the displacement measured by the power head displacement monitoring mechanism 6 is greater than the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4 and exceeds the set error range, it indicates that the power head 1 and the drill rod 5 are not firmly fixed during this period of time, and the actual displacement of the power head 1 is greater than the displacement of the drill rod 5 driven by the power head 1, and the monitoring system issues an alarm; if the displacement measured by the power head displacement monitoring mechanism 6 is less than the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4 and exceeds the set error range, it indicates that the power head displacement monitoring mechanism 6 has a failure problem during this period of time and cannot count each forward advancement of the power head 1, and the monitoring system issues an alarm;

[0072] S1.7 After all the drill rods 5 have been advanced into the borehole, a period of time is randomly selected and statistical data on the angular direction adjustment of the drill rods 5 during this period of time is checked. This allows the determination of which section of the drill rod 5 has undergone angular direction adjustment and the amount of angular direction adjustment for that section of the drill rod 5.

[0073] S2 The power head 1 pulls the drill rod 5 out of the borehole:

[0074] After the drill rod 5 is pulled out of the hole by the power head 1 and the outermost section of the drill rod 5 is removed, the clamping head 2 clamps the drill rod 5, and then the power head 1 releases the drill rod 5 and slides forward to the front end position. The power head 1 that has slid forward to the front end position re-clamps the drill rod 5, and the clamping head 2 releases the drill rod 5; the power head 1 continues to pull the drill rod 5 out of the hole by the set displacement, and then the clamping head clamps the drill rod 5 again, and the power head 1 releases the drill rod 5 again and slides forward to the front end position. After the power head 1 has been pulled out several times, the outermost section of the drill rod 5 is completely pulled out of the hole, the outermost section of the drill rod 5 is removed, and then the clamping head 2 clamps the drill rod 5 again, and the power head 1 releases the drill rod 5 again and slides forward to the front end position.

[0075] S2.2 Fix the next section of drill rod 5 to the power head 1 and repeat the above step S2.1 to pull the next section of drill rod 5 out of the borehole and remove it. Repeat this process until all drill rods 5 are pulled out of the borehole and removed.

[0076] S2.3 The displacement of each backward sliding movement of the power head 1 is measured by the power head displacement monitoring mechanism 6, and the measured displacement of each backward sliding movement of the power head 1 is statistically incorporated into the total displacement measured by the power head displacement monitoring mechanism 6. During the extraction of the drill rod 5, the power head 1 does not rotate the drill rod 5; the drill rod 5 is simply extracted outward along its axis with the power head 1. The total displacement of the drill rod 5 during extraction is measured by the single-point drill rod thread change monitoring mechanism 4.

[0077] S2.4 During the process of all the drill rods 5 being withdrawn to the outside of the borehole, if the power head 1 slides backward and the force-measuring flange 302 does not detect any backward pressure, it indicates that the drill rod 5 has not moved backward or that the drill rod 5 is disconnected from the single-point drill rod thread change monitoring mechanism 4. The monitoring system will sound an alarm and the drilling rig needs to be inspected. If the drill rod 5 has not moved backward, it indicates that the power head 1 is disconnected from the drill rod 5 and the power head 1 and the drill rod 5 need to be reattached. If the drill rod 5 is moving backward, it indicates that the drill rod 5 is disconnected from the single-point drill rod thread change monitoring mechanism 4 and the drill rod 5 needs to be reconnected to the single-point drill rod thread change monitoring mechanism 4.

[0078] S2.5 When all the drill rods 5 are pulled out of the borehole, a period of time is randomly selected, and the displacement of the drill rod 5 measured by the power head displacement monitoring mechanism 6 during this period of time is compared with the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4. If the difference between the two is within the set error range, it indicates that the displacement of the drill rod 5 measured by the power head displacement monitoring mechanism 6 during this period of time is the actual displacement of the drill rod 5; if the displacement measured by the power head displacement monitoring mechanism 6 is greater than the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4, If the displacement is greater than the set error range, it indicates that the power head 1 and the drill rod 5 are not firmly fixed during this period of time, and the actual displacement of the power head 1 is greater than the displacement of the drill rod 5 driven by the power head 1, and the monitoring system issues an alarm; if the displacement measured by the power head displacement monitoring mechanism 6 is less than the displacement of the drill rod 5 measured by the single-point position drill rod thread change monitoring mechanism 4 and exceeds the set error range, it indicates that the power head displacement monitoring mechanism 6 has failed during this period of time, and it is impossible to count each backward movement of the power head 1, and the monitoring system issues an alarm.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A drill rod working status monitoring system, provided on the clamping head of a drilling rig, characterized in that: It includes a power head displacement monitoring mechanism, a single-point position drill pipe thread change monitoring mechanism, and a drill pipe advance and retreat force direction monitoring mechanism; the power head displacement monitoring mechanism is arranged between the power head and the clamping head; the drill pipe advance and retreat force direction monitoring mechanism includes a shaft sleeve and a force measuring flange, the force measuring flange is fixedly arranged on the clamping head, and the shaft sleeve is fixedly arranged on the force measuring flange; the single-point position drill pipe thread change monitoring mechanism includes a rotating sleeve, which is rotatably arranged on the outside of the shaft sleeve, and an angle measuring component is arranged on the rotating sleeve, and two connecting tubes are fixedly arranged on the rotating sleeve, and an action ball is arranged on the connecting tube; one end of the drill pipe is fixed to the power head, and the other end of the drill pipe passes through the clamping head and the shaft sleeve, and the action ball is clamped into the spiral groove of the drill pipe; The angle measurement assembly includes a Hall sensor and a magnetic sheet. A circle of magnetic sheets arranged in a circular array is fixedly provided on the outer cylindrical surface of the rotating sleeve. A control box is fixedly provided on the force measuring flange. The control box is fixedly provided with a Hall sensor. The detection direction of the Hall sensor is toward one side of the magnetic sheet. Two symmetrical connecting rods are fixedly provided on the outer cylindrical surface of the rotating sleeve. A connecting tube is fixedly provided on each end of the two connecting rods away from the rotating sleeve. The connecting tube is a cylindrical structure with two openings at both ends. One end of the connecting tube is opened as a mounting hole for an action ball, and the inner diameter of the action ball mounting hole is equal to the inner diameter of the connecting tube; the other end of the connecting tube is opened as a mounting hole for a bolt, and the inner diameter of the bolt mounting hole is smaller than the inner diameter of the connecting tube; the action ball mounting holes of the two connecting tubes face each other. A ball seat and a spring are respectively provided inside each connecting tube; the ball seat is provided at the action ball mounting hole of the connecting tube, the ball seat comprises a coaxial large diameter section and a small diameter section, the large diameter section is located at the action ball mounting hole of the connecting tube, the small diameter section is located on the inner side of the connecting tube, an action ball is rollingly provided on the end face of the large diameter section away from the small diameter section, and the outer end of the action ball is located on the outer side of the action ball mounting hole; a threaded hole is provided on the end face of the small diameter section away from the large diameter section, and the end of the small diameter section away from the large diameter section extends into the bolt mounting hole of the connecting tube; the spring is sleeved on the outer side of the small diameter section of the ball seat, and the two ends of the spring are respectively in contact with the large diameter section and the inner wall of the connecting tube; the bolt extends from the bolt mounting hole of the connecting tube and is screwed into the threaded hole of the small diameter section of the ball seat, thereby connecting the ball seat with the connecting tube.

2. A drill pipe working status monitoring system according to claim 1, characterized in that: The force measuring flange includes an outer ring, an inner ring, and a sensor body. The sensor body is arranged between the outer ring and the inner ring. The outer ring is fixedly arranged on the end face of the drilling rig's clamping head away from the power head. The shaft sleeve is fixedly arranged on the end face of the inner ring of the force measuring flange away from the clamping head. The shaft sleeve is a cylindrical structure with openings at both ends.

3. The drill pipe working status monitoring system according to claim 1, characterized in that: The power head displacement monitoring mechanism is a pull-wire encoder, and a control box is fixedly arranged on the force measuring flange. The pull-wire box of the pull-wire encoder is fixedly arranged on the control box, and the pull-wire terminal of the pull-wire encoder is fixedly arranged on the power head. The pull wire of the pull-wire encoder is extended along the axial direction of the drill rod.

Images