Drilling depth measuring mechanism and method and rotary drilling rig

Abstract

The invention provides a drilling depth measuring mechanism and method and a rotary drilling rig, and the drilling depth measuring mechanism comprises a first displacement detection device which is used for detecting the displacement of a power head relative to a mast; the second displacement detection device is used for detecting the displacement of the power head relative to the drill rod; the data processing module is respectively connected with the first displacement detection device and the second displacement detection device; the data processing module is used for calculating the depth of the drill bit according to the displacement of the power head relative to the mast and the displacement of the power head relative to the drill rod. The drilling depth measuring mechanism not only has a simple structure, but also can accurately measure the drilling depth.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, and in particular to a drilling depth measuring mechanism and method and a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a common engineering machine. In order to obtain the drilling depth, a drilling depth measuring mechanism is generally provided on the rotary drilling rig, and the drilling depth measuring mechanism is used to detect the depth of the drill bit, thereby obtaining the drilling depth.

[0003] For example, the patent CN220955564U discloses a long spiral pile driver rotary drilling depth measuring device, which installs a laser distance sensor under the power head, and uses the laser distance measuring sensor to measure the height of the power head from the ground, thereby serving as the drilling depth. However, during the drilling process, the ground height at the hole mouth will change (accumulated soil or silt will increase the ground height at the hole mouth), making the measurement data of the depth measuring device inaccurate; moreover, if the current long spiral drill rod cannot meet the current drilling depth, it is necessary to use an extended active drill rod to increase the drill rod length, but the depth measuring device cannot calculate the drilling depth of the extended active drill rod, so it is not convenient for drilling depth measurement. Summary of the invention

[0004] The purpose of the present invention is to provide a drilling depth measuring mechanism and method and a rotary drilling rig, aiming to solve or at least partially solve the deficiencies of the above-mentioned background technology. The drilling depth measuring mechanism is not only simple in structure, but also can accurately measure the drilling depth.

[0005] The present invention provides a drilling depth measuring mechanism for a rotary drilling rig, wherein the rotary drilling rig comprises a mast, a power head arranged on the mast, and a drill rod connected to the power head, wherein a drill bit is arranged at the bottom end of the drill rod, and the drilling depth measuring mechanism comprises:

[0006] A first displacement detection device, used to detect the displacement of the power head relative to the mast;

[0007] A second displacement detection device, used to detect the displacement of the power head relative to the drill rod;

[0008] A data processing module is connected to the first displacement detection device and the second displacement detection device respectively; the data processing module is used to calculate the depth of the drill bit according to the displacement of the power head relative to the mast and the displacement of the power head relative to the drill rod.

[0009] Furthermore, the drill rod is provided with a plurality of pressurizing locations, which are spaced apart up and down; the power head can contact different pressurizing locations respectively to pressurize different pressurizing locations; and the second displacement detection device is used to detect the displacement of the power head relative to the drill rod when the power head switches the pressurizing locations.

[0010] Furthermore, the multiple pressurizing parts include multiple pressurizing platforms and multiple pulling platforms, and the multiple pressurizing platforms and the multiple pulling platforms are arranged at intervals up and down; the power head can contact the multiple pressurizing platforms and the multiple pulling platforms respectively to pressurize different pressurizing platforms or different pulling platforms; the second displacement detection device is used to detect the displacement of the power head relative to the drill pipe when the power head switches the pressurizing platform or the pulling platform.

[0011] Furthermore, the rotary drilling rig also includes a winch and pressure device arranged on the mast, and the winch and pressure device is connected to the power head; the first displacement detection device includes a rotary encoder arranged on the winch and pressure device, and the data processing module is connected to the rotary encoder; the rotary encoder is used to detect the number of rotations of the drum in the winch and pressure device.

[0012] Furthermore, the second displacement detection device is a distance detection device, which is arranged on the power head and / or the top of the drill rod, and is used to detect the change in distance between the power head and the top of the drill rod.

[0013] Furthermore, the second displacement detection device includes a pull-wire sensor, and the data processing module is connected to the pull-wire sensor; the pull-wire sensor is arranged on the power head, and the pull wire of the pull-wire sensor is connected to the top of the drill rod.

[0014] Furthermore, it also includes:

[0015] A drilling depth reset switch is connected to the data processing module; the drilling depth reset switch is used to generate a drilling depth reset instruction in response to an operator's operation, and the data processing module calibrates the depth of the drill bit as 0 at this time based on the drilling depth reset instruction.

[0016] The present invention also provides a drilling depth measuring method based on the drilling depth measuring mechanism as described above, the drilling depth measuring method comprising:

[0017] During the drilling construction process of the rotary drilling rig, a first displacement detection device is used to detect a first displacement A of the power head relative to the mast, and a second displacement detection device is used to detect a second displacement B of the power head relative to the drill rod; a data processing module calculates a depth H of the drill bit based on the first displacement A and the second displacement B.

[0018] Furthermore, it also includes:

[0019] During the drilling construction process of the rotary drilling rig, when the drill bit just contacts the ground, the data processing module calibrates the depth of the drill bit as 0 based on the drilling depth reset instruction.

[0020] The present invention also provides a rotary drilling rig, comprising the drilling depth measuring mechanism as described above.

[0021] The drilling depth measuring mechanism provided by the present invention is provided with a first displacement detection device, a second displacement detection device and a data processing module, the first displacement detection device is used to detect the displacement of the power head relative to the mast, the second displacement detection device is used to detect the displacement of the power head relative to the drill rod, and the data processing module can accurately calculate the depth of the drill bit according to the displacement of the power head relative to the mast and the displacement of the power head relative to the drill rod; and, because when the extended active drill rod is used and the power head is switching the pressurized part, the second displacement detection device can detect the displacement of the power head relative to the drill rod, and the displacement can compensate for the drilling depth of the extended active drill rod, so the drilling depth measuring mechanism can meet the drilling depth measurement under the extended active drill rod use condition. At the same time, the drilling depth measuring mechanism has a wide range of applications (not affected by the flatness of the ground, nor by the size of the drill bit and drilling tools), a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figures 1 to 4 The figure is a schematic diagram of the working process of the rotary drilling rig during drilling operation in an embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the structural decomposition of the drill rod in an embodiment of the present invention.

[0024] Figure 6 4 is a structural block diagram of a drilling depth measuring mechanism in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0027] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the present invention are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection claimed in this application.

[0028] like Figures 1 to 6 As shown, an embodiment of the present invention provides a drilling depth measuring mechanism for a rotary drilling rig 100, the rotary drilling rig 100 comprises a mast 1, a power head 2 disposed on the mast 1, and a drill rod 3 connected to the power head 2, wherein a drill bit 30 is disposed at the bottom end of the drill rod 3. The power head 2 can move up and down relative to the mast 1, and the power head 2 is used to drive the drill rod 3 to rotate.

[0029] The drilling depth measuring mechanism comprises:

[0030] The first displacement detection device 5 is used to detect the displacement of the power head 2 relative to the mast 1 (i.e. the displacement in the up and down directions);

[0031] The second displacement detection device 6 is used to detect the displacement of the power head 2 relative to the drill rod 3 (i.e. the displacement in the up and down directions);

[0032] The data processing module 7 is connected to the first displacement detection device 5 and the second displacement detection device 6 respectively (specifically, an electrical signal connection). The data processing module 7 can receive the displacement of the power head 2 relative to the mast 1 detected by the first displacement detection device 5, and the displacement of the power head 2 relative to the drill rod 3 detected by the second displacement detection device 6; the data processing module 7 is used to calculate the depth of the drill bit 30 (i.e., the drilling depth) based on the displacement of the power head 2 relative to the mast 1 and the displacement of the power head 2 relative to the drill rod 3.

[0033] Furthermore, if Figures 1 to 5 As shown, in this embodiment, a plurality of (at least two) pressurizing locations 310 are provided on the drill rod 3, and the plurality of pressurizing locations 310 are arranged at intervals in the upper and lower parts on the drill rod 3. The power head 2 can contact different pressurizing locations 310 respectively to pressurize different pressurizing locations 310. The second displacement detection device 6 is used to detect the displacement of the power head 2 relative to the drill rod 3 when the pressurizing location 310 is switched (that is, when the pressurizing point of the power head 2 on the drill rod 3 is switched).

[0034] Specifically, when the rotary drilling rig 100 is drilling or pulling out the drill rod, when the power head 2 has not switched the pressurized part 310, since the drill rod 3 moves up and down with the power head 2 at this time, there is no relative displacement between the power head 2 and the drill rod 3 (that is, the relative displacement of the two is 0). At this time, the displacement of the power head 2 relative to the mast 1 represents the displacement of the drill rod 3, that is, the depth of the drill bit 30.

[0035] When the power head 2 switches the pressurizing part 310, since the pressurizing parts 310 are arranged with upper and lower intervals, and the drill rod 3 will not move up and down with the power head 2 (that is, the drill rod 3 does not move) during the switching of the pressurizing part 310, the depth of the drill bit 30 of the power head 2 actually remains unchanged during the switching of the pressurizing part 310; but since the power head 2 produces a displacement relative to the mast 1 during the switching of the pressurizing part 310, the displacement of the power head 2 relative to the mast 1 at this time cannot represent the depth of the drill bit 30, and the displacement of the power head 2 relative to the drill rod 3 detected by the second displacement detection device 6 is needed to compensate for the displacement of the power head 2 relative to the mast 1, so as to obtain an accurate depth of the drill bit 30.

[0036] For example, when the rotary drilling rig 100 is drilling, when the power head 2 has not switched the pressurized part 310, when the first displacement detection device 5 detects that the power head 2 has moved downward by 10 meters relative to the mast 1, that is, the drill rod 3 and the drill bit 30 have moved downward by 10 meters, the depth of the drill bit 30 is 10 meters (assuming that the drill bit 30 has just contacted the ground and the depth of the drill bit 30 is calibrated to 0). Thereafter, if the power head 2 switches the pressurized part 310, and during the switching process the power head 2 moves upward by, for example, 7 meters relative to the mast 1, the first displacement detection device 5 detects that the downward displacement of the power head 2 relative to the mast 1 becomes 3 meters (that is, the displacement detected by the first displacement detection device 5 decreases by 7 meters), while in fact the depth of the drill bit 30 remains unchanged; during the switching process, the second displacement detection device 6 detects that the power head 2 moves upward by 7 meters relative to the drill rod 3, and the upward displacement of the power head 2 relative to the drill rod 3 detected by the second displacement detection device 6 is used to compensate for the downward displacement of the power head 2 relative to the mast 1 detected by the first displacement detection device 5 (that is, during the switching process, the displacement of the power head 2 relative to the drill rod 3 is equal to the displacement change of the power head 2 relative to the mast 1), and the actual depth of the drill bit 30 is obtained to be 10 meters.

[0037] Furthermore, if Figures 1 to 5As shown, in this embodiment, the multiple pressurizing parts 310 include multiple (at least two) pressurizing platforms and multiple (at least two) pulling platforms, and the multiple pressurizing platforms and the multiple pulling platforms are arranged at intervals up and down. The power head 2 can contact with multiple pressurizing platforms and multiple pulling platforms respectively to pressurize different pressurizing platforms or different pulling platforms. Among them, when the rotary drilling rig 100 is in the drilling operation, the power head 2 contacts with the pressurizing platform, thereby applying downward pressure to the pressurizing platform and the drill rod 3; when the rotary drilling rig 100 is in the pulling and pulling operation of the drill rod, the power head 2 contacts with the pulling platform, thereby applying upward pressure to the pulling and pulling platform and the drill rod 3. The second displacement detection device 6 is used to detect the displacement of the power head 2 relative to the drill rod 3 when the pressurizing platform or the pulling platform is switched.

[0038] Of course, in other embodiments, the multiple pressurizing parts 310 may also include only one pressurizing platform and one pulling platform, which are arranged with an upper and lower interval, and the second displacement detection device 6 is used to detect the displacement of the power head 2 relative to the drill rod 3 when the power head 2 switches between the pressurizing platform and the pulling platform.

[0039] Furthermore, if Figures 1 to 5 As shown, in this embodiment, the plurality of pressurizing platforms include an upper pressurizing platform 311 and a lower pressurizing platform 312, and the plurality of lifting platforms include an upper lifting platform 313 and a lower lifting platform 314. The upper pressurizing platform 311, the lower pressurizing platform 312, the upper lifting platform 313 and the lower lifting platform 314 are arranged at intervals from top to bottom. The upper pressurizing platform 311 is located above the lower pressurizing platform 312, the upper lifting platform 313 is located above the lower lifting platform 314, and the upper pressurizing platform 311 and the upper lifting platform 313 are arranged close to each other, and the lower pressurizing platform 312 and the lower lifting platform 314 are arranged close to each other. The second displacement detection device 6 is used to detect the displacement of the power head 2 relative to the drill pipe 3 when the power head 2 switches between the upper pressurizing platform 311, the lower pressurizing platform 312, the upper lifting platform 313 and the lower lifting platform 314.

[0040] Furthermore, if Figures 1 to 5 As shown, in this embodiment, the drill rod 3 includes an extended active drill rod 31 and a plurality of long spiral drill rods 32 (three in the figure), the extended active drill rod 31 and the plurality of long spiral drill rods 32 are connected end to end from top to bottom, and the drill bit 30 is arranged at the bottom end of the lowest long spiral drill rod 32. A plurality of pressurizing parts 310 are arranged on the extended active drill rod 31 at intervals, and an upper pressurizing platform 311 and an upper pulling platform 313 are arranged at the top end of the extended active drill rod 31, and a lower pressurizing platform 312 and a lower pulling platform 314 are arranged at the bottom end of the extended active drill rod 31. Figure 1 and Figure 2As shown, when the rotary drilling rig 100 is in the drilling operation, when the length of the multiple long spiral drill rods 32 can meet the drilling depth, there is no need to use the extended active drill rod 31. At this time, the power head 2 contacts the lower pressurizing platform 312 to pressurize the lower pressurizing platform 312; Figure 3 and Figure 4 As shown, when the length of multiple long spiral drill rods 32 cannot meet the drilling depth, it is necessary to use an extended active drill rod 31. At this time, the power head 2 switches from the lower pressurizing platform 312 to the upper pressurizing platform 311 to pressurize the upper pressurizing platform 311 so that the extended active drill rod 31 can be drilled into the ground to meet the drilling depth requirements.

[0041] Furthermore, if Figures 1 to 4 As shown, in this embodiment, the rotary drilling rig 100 also includes a hoisting and pressurizing device 4 disposed on the mast 1, and the hoisting and pressurizing device 4 is connected to the power head 2. The hoisting and pressurizing device 4 is used to apply downward or upward pressure to the power head 2, and then apply downward or upward pressure to the drill rod 3 through the power head 2. The first displacement detection device 5 includes a rotary encoder disposed on the hoisting and pressurizing device 4, and the data processing module 7 is connected to the rotary encoder (specifically, an electrical signal connection); the rotary encoder is used to detect the number of rotations of the drum (not shown) in the hoisting and pressurizing device 4, and then calculate the displacement of the power head 2 relative to the mast 1 according to the number of rotations of the drum. The structure and working principle of the rotary encoder can be referred to the prior art, which will not be repeated here.

[0042] Specifically, two steel wire ropes are wound oppositely on the drum of the winch pressurizing device 4, one is a pressurizing steel wire rope, and the other is a lifting steel wire rope. The two steel wire ropes are connected to the movable pulley on the power head 2 through the fixed pulley on the mast 1. The winding and unwinding of the steel wire ropes are achieved by the rotation of the drum, thereby achieving the lifting or pressurization of the power head 2. Since the winch pressurizing device 4 can provide greater pressure and longer stroke than other pressurizing devices (such as oil cylinder pressurizing devices), the rotary drilling rig 100 can be applied to the long spiral method. The structure and working principle of the winch pressurizing device 4 can be referred to the prior art, which will not be repeated here.

[0043] Furthermore, if Figures 1 to 4 As shown, in this embodiment, the second displacement detection device 6 is a distance detection device, and the second displacement detection device 6 is arranged on the power head 2 and / or the top end of the drill rod 3. The second displacement detection device 6 is used to detect the change in the distance between the power head 2 and the top end of the drill rod 3; according to the change in the distance between the power head 2 and the top end of the drill rod 3, the displacement of the power head 2 relative to the drill rod 3 can be obtained.

[0044] Furthermore, if Figures 1 to 4As shown, in this embodiment, the second displacement detection device 6 includes a wire sensor 60, and the data processing module 7 is connected to the wire sensor 60 (specifically, an electrical signal connection). The wire sensor 60 is arranged on the power head 2, and the wire 61 of the wire sensor 60 is connected to the top of the drill rod 3. The wire 61 can be extended up and down. According to the extension amount of the wire 61, the distance change between the power head 2 and the top of the drill rod 3 can be obtained, that is, the displacement of the power head 2 relative to the drill rod 3 can be obtained.

[0045] Specifically, the pull-wire sensor 60 includes a main body 62 and a pull-wire 61. The main body 62 is arranged on the power head 2. One end of the pull-wire 61 is connected to the main body 62, and the other end of the pull-wire 61 is connected to the top of the drill rod 3. The pull-wire 61 can be extended and retracted relative to the main body 62. A pull-wire extension and retraction detection module (not shown) is arranged in the main body 62. The pull-wire extension and retraction detection module is used to detect the extension amount of the pull-wire 61. The pull-wire extension and retraction detection module is connected to the data processing module 7 by electrical signals. Since the main body 62 needs to be connected to the data processing module 7, the pull-wire sensor 60 is arranged on the power head 2 to facilitate wiring. The pull-wire sensor 60 has the advantages of high stability and high detection accuracy. The structure and working principle of the pull-wire sensor 60 can be referred to the existing technology, which will not be repeated here (the pull-wire sensor 60 can specifically adopt the pull-wire position sensor of the Danfoss DST X800 series on the market).

[0046] Of course, in other embodiments, the second displacement detection device 6 may also adopt other distance measuring devices, such as a laser distance measuring device.

[0047] Furthermore, if Figures 1 to 5 As shown, in this embodiment, the top of the drill rod 3 is provided with a wire fixing portion 33, and the wire 61 is connected to the wire fixing portion 33, so as to facilitate the installation of the wire 61. Specifically, the wire fixing portion 33 is arranged at the top of the lengthened active drill rod 31, and the wire fixing portion 33 is located above the upper pressurizing platform 311 and the upper pulling platform 313.

[0048] Furthermore, if Figure 6 As shown, in this embodiment, the drilling depth measuring mechanism also includes:

[0049] The display device 9 is connected to the data processing module 7 (specifically, connected by electrical signals); the display device 9 is used to receive and display the depth of the drill bit 30 calculated by the data processing module 7 .

[0050] In the present embodiment, the display device 9 is an operation panel in the cab of the rotary drilling rig 100 ; of course, in other embodiments, the display device 9 may also be an additional display device.

[0051] Furthermore, if Figure 6 As shown, in this embodiment, the drilling depth measuring mechanism also includes:

[0052] The drilling depth reset switch 8 is connected to the data processing module 7 (specifically, an electrical signal connection); the drilling depth reset switch 8 is used to generate a drilling depth reset instruction in response to the operator's operation, and the data processing module 7 can receive the drilling depth reset instruction. The data processing module 7 calibrates the depth of the drill bit 30 at this time as 0 based on the drilling depth reset instruction.

[0053] Specifically, in this embodiment, the drilling depth reset switch 8 is a virtual button provided on the display device 9; of course, in other embodiments, the drilling depth reset switch 8 may also be a physical switch, specifically a control element such as a button or a knob. When the operator presses the drilling depth reset switch 8, a drilling depth reset instruction is generated, and the data processing module 7 calibrates the depth of the drill bit 30 as 0 at this time based on the drilling depth reset instruction, that is, the drilling depth displayed on the display device 9 is 0 at this time.

[0054] Furthermore, in this embodiment, the data processing module 7 may be a separate module or a module integrated in the controller. Specifically, the data processing module 7 may be an arithmetic unit, an MCU (micro control unit), or the like.

[0055] Furthermore, if Figure 1 As shown, in this embodiment, the power head 2 is further provided with a guide rod 21, and the top of the drill rod 3 is further provided with a guide plate 34, which is slidably connected to the guide rod 21 (specifically, the guide plate 34 is provided with a through hole, and the guide rod 21 is inserted into the through hole), so as to guide and support the drill rod 3 when it moves up and down. In this embodiment, the wire fixing portion 33 is arranged above the guide plate 34; in other embodiments, the wire fixing portion 33 can also be arranged on the guide plate 34.

[0056] Furthermore, if Figure 1 As shown, in this embodiment, the rotary drilling rig 100 also includes a chassis (not numbered) and a turntable disposed on the chassis, the bottom end of the mast 1 is connected to the turntable, and the chassis is a crawler chassis. The specific structure of the rotary drilling rig 100 can be referred to the prior art and will not be described here.

[0057] The embodiment of the present invention further provides a drilling depth measuring method based on the drilling depth measuring mechanism as described above, the drilling depth measuring method comprising:

[0058] During the drilling construction process of the rotary drilling rig 100, the first displacement detection device 5 is used to detect the first displacement A of the power head 2 relative to the mast 1, and the second displacement detection device 6 is used to detect the second displacement B of the power head 2 relative to the drill rod 3; the data processing module 7 calculates the depth H of the drill bit 30 based on the first displacement A and the second displacement B.

[0059] Furthermore, in this embodiment, the drilling depth measurement method further includes: during the drilling construction process of the rotary drilling rig 100, when the drill bit 30 just contacts the ground, the data processing module 7 calibrates the depth of the drill bit 30 as 0 based on the drilling depth reset instruction.

[0060] Further, in this embodiment, the second displacement B includes the upward displacement B1 of the power head 2 relative to the drill rod 3 when it moves upward, and the downward displacement B2 of the power head 2 relative to the drill rod 3 when it moves downward. Under the premise that the drill bit 30 is calibrated to just contact the ground and the depth of the drill bit 30 is 0, the drilling depth satisfies the formula: H=A+B1-B2; wherein A, B1 and B2 are all greater than or equal to 0. The drilling depth formula is applicable to the drilling depth calculation when the rotary drilling rig 100 is in the drilling condition, and is also applicable to the drilling depth calculation when the rotary drilling rig 100 is in the rod pulling condition.

[0061] The embodiment of the present invention further provides a rotary drilling rig 100, comprising the drilling depth measuring mechanism as described above.

[0062] The following specifically describes the working process of the drilling depth measurement mechanism:

[0063] When the rotary drilling rig 100 is in the drilling operation, Figure 1 As shown, when the drill bit 30 just contacts the ground, the operator presses the drilling depth reset switch 8 on the display device 9 to generate a drilling depth reset instruction. The data processing module 7 calibrates the depth of the drill bit 30 at this time as 0 based on the drilling depth reset instruction, that is, the drilling depth displayed on the display device 9 is 0. At this time, the power head 2 contacts the lower pressure platform 312 on the drill rod 3, and the hoisting pressure device 4 applies downward pressure to the power head 2. The power head 2 applies downward pressure to the drill rod 3 through the lower pressure platform 312. At the same time, the power head 2 drives the drill rod 3 to rotate, so as to achieve the drilling of the drill bit 30. At this time, the first displacement detection device 5 detects the displacement A1 of the power head 2 relative to the mast 1. The displacement A1 is the drilling depth. At this time, the drilling depth displayed on the display device 9 is A1.

[0064] like Figure 2 As shown, when all the long spiral drill rods 32 in the drill rod 3 are drilled into the ground, since the current hole depth does not meet the design hole depth requirement, the extended active drill rod 31 in the drill rod 3 needs to be drilled into the ground. At this time, the power head 2 needs to switch the pressurizing platform, and the power head 2 moves upward from the lower pressurizing platform 312 to the upper pressurizing platform 311, that is, the power head 2 contacts the upper pressurizing platform 311 to apply downward pressure to the upper pressurizing platform 311, that is, Figure 3As shown; since the power head 2 has undergone relative displacement relative to the drill rod 3 and the mast 1 at this time, the displacement detected by the first displacement detection device 5 is reduced from A1 to A2, and the second displacement detection device 6 detects that the displacement of the power head 2 relative to the drill rod 3 is B, and the displacement B is the same as the reduction in displacement A1, that is, B=A1-A2, and at this time H=A2+B=A1, so the drilling depth displayed on the display device 9 is still A1, and the drilling depth displayed on the display device 9 is consistent with the actual drilling depth.

[0065] like Figure 4 As shown, when the drill rod 3 and the drill bit 30 continue to drill downward, the power head 2 and the mast 1 continue to produce relative displacement, and the displacement detected by the first displacement detection device 5 increases from A2 to A3. At this time, H=A3+B, and the drilling depth displayed on the display device 9 is A3+B. The drilling depth displayed on the display device 9 is consistent with the actual drilling depth.

[0066] The workflow of the rotary drilling rig 100 when pulling out the drill rod is the reverse process of the above steps, and the process of pulling out the drill rod involves the steps of the power head 2 first switching from the upper pressurizing platform 311 to the upper pulling platform 313, and then switching from the upper pulling platform 313 to the lower pulling platform 314. The workflow of the rotary drilling rig 100 when pulling out the drill rod is not described in detail here.

[0067] The drilling depth measuring mechanism and method provided in the embodiment of the present invention, by setting a first displacement detection device 5, a second displacement detection device 6 and a data processing module 7, uses the first displacement detection device 5 to detect the displacement of the power head 2 relative to the mast 1, and uses the second displacement detection device 6 to detect the displacement of the power head 2 relative to the drill rod 3. According to the displacement of the power head 2 relative to the mast 1 and the displacement of the power head 2 relative to the drill rod 3, the data processing module 7 can accurately calculate the depth of the drill bit 30; and, because when the extended active drill rod 31 is used and the power head 2 is switching the pressurization part 310, the second displacement detection device 6 can detect the displacement of the power head 2 relative to the drill rod 3, and the displacement can compensate for the drilling depth of the extended active drill rod 31, so the drilling depth measuring mechanism can meet the drilling depth measurement under the use condition of the extended active drill rod 31. At the same time, the drilling depth measuring mechanism has a wide range of applications (not affected by the flatness of the ground or the size of the drill bit and drill tools), a simple structure, low cost, and simple operation. The operator only needs to press the drilling depth reset switch 8, and no secondary operation is required, thereby avoiding the problem of inaccurate drilling depth measurement caused by the operator's need to perform a secondary operation (in some prior arts, when the power head 2 switches the pressurization position 310, a secondary operation is required to compensate for the drilling depth effect caused by the power head 2 switching the pressurization point. This method is not only inconvenient to operate, but also once the operator forgets to perform the compensation operation or operates incorrectly, the drilling depth measurement will be inaccurate).

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A drilling depth measuring mechanism for a rotary drilling rig, the rotary drilling rig comprising a mast, a power head arranged on the mast and a drill rod connected to the power head, a drill bit being arranged at the bottom end of the drill rod, characterized in that: The drilling depth measuring mechanism comprises: A first displacement detection device, used to detect the displacement of the power head relative to the mast; A second displacement detection device, used to detect the displacement of the power head relative to the drill rod; A data processing module is connected to the first displacement detection device and the second displacement detection device respectively; the data processing module is used to calculate the depth of the drill bit according to the displacement of the power head relative to the mast and the displacement of the power head relative to the drill rod.

2. The drilling depth measuring mechanism according to claim 1, characterized in that: The drill rod is provided with a plurality of pressurizing locations, which are spaced apart up and down; the power head can contact different pressurizing locations respectively to pressurize different pressurizing locations; the second displacement detection device is used to detect the displacement of the power head relative to the drill rod when the power head switches the pressurizing locations.

3. The drilling depth measuring mechanism according to claim 2, characterized in that: The multiple pressurizing parts include multiple pressurizing platforms and multiple pulling platforms, and the multiple pressurizing platforms and the multiple pulling platforms are arranged at intervals up and down; the power head can contact the multiple pressurizing platforms and the multiple pulling platforms respectively to pressurize different pressurizing platforms or different pulling platforms; the second displacement detection device is used to detect the displacement of the power head relative to the drill pipe when the power head switches the pressurizing platform or the pulling platform.

4. The drilling depth measuring mechanism according to claim 1, characterized in that: The rotary drilling rig also includes a winch and pressure device arranged on the mast, and the winch and pressure device is connected to the power head; the first displacement detection device includes a rotary encoder arranged on the winch and pressure device, and the data processing module is connected to the rotary encoder; the rotary encoder is used to detect the number of rotations of the drum in the winch and pressure device.

5. The drilling depth measuring mechanism according to claim 1, characterized in that: The second displacement detection device is a distance detection device, which is disposed on the power head and / or the top end of the drill rod, and is used to detect the change in distance between the power head and the top end of the drill rod.

6. The drilling depth measuring mechanism according to claim 5, characterized in that: The second displacement detection device comprises a pull-wire sensor, and the data processing module is connected to the pull-wire sensor; the pull-wire sensor is arranged on the power head, and the pull wire of the pull-wire sensor is connected to the top end of the drill rod.

7. The drilling depth measuring mechanism according to any one of claims 1 to 6, characterized in that: Also includes: A drilling depth reset switch is connected to the data processing module; the drilling depth reset switch is used to generate a drilling depth reset instruction in response to an operator's operation, and the data processing module calibrates the depth of the drill bit as 0 at this time based on the drilling depth reset instruction.

8. A drilling depth measuring method based on the drilling depth measuring mechanism according to any one of claims 1 to 7, characterized in that: The drilling depth determination method comprises: During the drilling construction process of the rotary drilling rig, a first displacement detection device is used to detect a first displacement A of the power head relative to the mast, and a second displacement detection device is used to detect a second displacement B of the power head relative to the drill rod; a data processing module calculates a depth H of the drill bit based on the first displacement A and the second displacement B.

9. The drilling depth measuring method according to claim 8, characterized in that: Also includes: During the drilling construction process of the rotary drilling rig, when the drill bit just contacts the ground, the data processing module calibrates the depth of the drill bit as 0 based on the drilling depth reset instruction.

10. A rotary drilling rig, characterized in that: It comprises a drilling depth measuring mechanism as described in any one of claims 1-7.

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