Drill rod angle measuring mechanism for branch draw shaft construction

Abstract

The utility model provides a drill rod angle measuring mechanism for branch draw shaft construction, belongs to the technical field of underground mine construction, and is used for measuring the angle of a drill rod for branch draw shaft construction in the underground mine branch draw shaft construction process. Comprising a rack and a measuring frame. The rack comprises two end frames and a connecting cylinder, the two end frames are arranged at an interval, and the connecting cylinder is connected between the two end frames; the two groups of measuring frames comprise two side rods and a measuring rod, the two side rods are vertically connected to the two ends of the measuring rod, and the other ends of the two side rods are rotationally connected to the two end frames of the rack respectively; a driving mechanism is arranged on the rack and used for driving the measuring frames to rotate, and rotation of the two sets of measuring frames is independently controlled. One end and / or two ends of the measuring rod are / is provided with distance sensors, and the distance measuring direction faces the other end. The measuring mechanism can measure the axis of a pre-drilled hole of the branch draw shaft, the position of the branch draw shaft is positioned before formal drilling construction, and it is ensured that the branch draw shaft is accurately in butt joint with a main draw shaft after blasting construction.

Description

Technical Field

[0001] This utility model belongs to the field of underground mine construction technology, and in particular relates to a drill pipe angle measuring mechanism for branch ore passage construction. Background Technology

[0002] Branch ore passes are important structures in underground mining, connecting the main pass to different sections and used for transporting ore or waste rock. As a key component of the mine's transportation system, the construction quality and efficiency of branch ore passes directly affect the mine's production capacity and safety.

[0003] To address the problems of low efficiency and difficulty in ensuring quality in traditional branch ore well construction, the applicant proposed a new construction method that combines drilling and blasting techniques to achieve efficient and precise construction of branch ore wells.

[0004] However, in the actual construction process, ensuring the precise connection between the branch chute and the main chute has become a technical problem that urgently needs to be solved. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a drill pipe angle measuring mechanism for branch ore construction, which is used to measure the angle of the drill pipe during the construction of branch ore in underground mines.

[0006] To achieve the above and other related objectives, this utility model provides a drill pipe angle measuring mechanism for branch well construction, used to measure the drill exit angle of the drill pipe drilling from the branch well into the main well, including a frame and a measuring frame mounted on the frame;

[0007] The frame includes two end frames and a connecting cylinder. The two end frames are spaced apart, and the connecting cylinder is connected between the two end frames. The frame as a whole is dumbbell-shaped.

[0008] The measuring frame consists of two sets, each including two side rods and one measuring rod. The two side rods are vertically connected to both ends of the measuring rod, which is the measuring end. The other ends of the two side rods are rotatably connected to the two end frames of the frame, which is the driving end.

[0009] The frame is equipped with a drive mechanism for driving the measuring frame to rotate around the axis of the connecting cylinder, and the rotation of the two sets of measuring frames is controlled independently.

[0010] Distance sensors are provided at one and / or both ends of the measuring rod, with the distance measuring direction being towards the other end of the measuring rod.

[0011] Optionally, the measuring rod of one set of measuring frames is longer than the measuring rod of the other set of measuring frames, and during the mutual rotation of the two sets of measuring frames, one set of measuring frames can enter the range of the other set of measuring frames.

[0012] Optionally, the side rod is a telescopic rod.

[0013] Optionally, each of the two end frames at both ends of the frame is provided with a rotary power source, and the rotation axis coincides with the axis of the connecting cylinder;

[0014] In the two sets of measuring frames:

[0015] One side rod of one set of measuring frames is rotatably connected to the rotation axis of one of the rotating power sources, and is defined as the upper side rod and the upper power source; the other side rod is fixedly connected to the rotation axis of the other rotating power source, and is defined as the lower side rod and the lower power source.

[0016] In another set of measuring frames, the upper rod is fixedly connected to the upper power source, and the lower rod is rotatably connected to the lower power source;

[0017] The upper and lower power sources control the rotation angles of the two sets of measuring frames, respectively.

[0018] Optionally, each of the two end frames at both ends of the frame is fixedly provided with a rotating support rod coaxial with the connecting cylinder. The two end side rods of the two sets of measuring frames are rotatably connected to the rotating support rods on the connecting cylinder. At the rotatable connection point, a tail rod is provided at the outer end of the side rod. A gear driven by a motor is rotatably connected to the end of the tail rod. An arc-shaped rack that meshes with the gear is fixedly provided on the end frame.

[0019] Optionally, at the same end frame, the gears at the ends of the tail rods of the two sets of measuring frames mesh with the same arc-shaped rack, and the two gears are staggered in height, respectively meshing with the upper and lower edges of the arc-shaped rack.

[0020] Optionally, an arc-shaped plate is fixed on the motor of the gear, and an arc-shaped groove is provided on the arc-shaped rack, and the arc-shaped plate slides in the arc-shaped groove.

[0021] Optionally, a resistive patch is provided along the arc direction at the edge of the arc-shaped groove, and an electrode is provided on the arc-shaped patch. During the sliding of the arc-shaped patch along the arc-shaped groove, the electrode contacts the resistive patch at different positions.

[0022] Alternatively, the motor may be equipped with an encoder that can convert the motor's rotation angle information into an electrical signal.

[0023] Optionally, the side rod is an electric telescopic rod, with the tail end of the housing connected to the frame and the end of the telescopic shaft connected to the measuring rod.

[0024] Optionally, the distance sensor is an infrared ranging sensor, which is installed at one end of the measuring rod and faces the other end.

[0025] As described above, the drill pipe angle measuring mechanism for branch well construction of this utility model has at least the following beneficial effects:

[0026] This surveying device can measure the axis of the pre-drilled boreholes for branch ore passes, thus accurately locating the branch ore passes before formal drilling. This function ensures accurate alignment between the branch ore passes and the main ore passes after blasting operations, effectively solving the alignment problems existing in traditional construction. By improving construction accuracy, this device not only enhances the construction quality of branch ore passes but also reduces safety risks caused by construction deviations, providing a strong guarantee for the safe and efficient mining of underground mines. Attached Figure Description

[0027] Figure 1 The diagram shown is an overall schematic diagram of this utility model.

[0028] Figure 2 This utility model is shown. Figure 1 A magnified view of a portion of point B in the middle.

[0029] Figure 3 The diagram shows the measuring mechanism of this utility model installed after being mounted on a fixed device.

[0030] Figure 4 The diagram shows a measuring mechanism installed at the outlet of a branch chute via a fixing device.

[0031] Figure 5 The diagram shows a top view of the measuring mechanism installed at the outlet of a branch chute via a fixing device.

[0032] Figure 6 The diagram shown is a simplified illustration of an application scenario for this utility model.

[0033] The components include: arc-shaped rack 12, resistive patch 121, tail rod 401, arc-shaped piece 402, electrode 403, measuring rod 41, distance sensor 43, side rod 44, and rotating support rod 45. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0035] Please see Figures 1 to 6It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0036] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0037] Please refer to this embodiment. Figures 1-2 The present invention provides an embodiment of a drill pipe angle measuring mechanism for branch well construction, which is used to measure the drilling angle of the drill pipe as it drills from the branch well into the main well.

[0038] To facilitate understanding of this plan, the main process of branch chute construction is briefly introduced below. It should be noted that this process is not the core content of this plan, but merely serves as technical background. (See also...) Figure 6 In underground mining, to improve ore transportation efficiency, the main ore pass 20 is typically used for the lowering and hauling of ore in the first section 21. The main ore pass 20 serves as the primary channel for ore transportation, with its bottom connected to transport equipment to ensure smooth ore transport. However, due to geographical limitations, the main ore pass 20 cannot be directly used for lowering ore in other sections 22. Therefore, branch ore passes are needed to guide the ore from these sections to the main ore pass 20. The construction of branch ore passes is a complex project. Because each section is located underground with complex geological conditions, the connection method of the branch ore passes 24 must be designed and constructed based on detailed exploration results. During construction, the starting point of the branch ore pass is located in another section 22, while the outlet is connected to the main ore pass 20. The entire branch ore pass is located deep underground. Furthermore, branch ore passes often extend at an angle, further increasing the difficulty of construction. Based on the above issues, the applicant adopted a blasting construction method, which, in simple terms, includes the following steps: designing the axis of a branch ore passage based on the spatial location of the main ore passage 20 and a certain intermediate section 22, with the branch ore passage connecting the main ore passage 20 and the certain intermediate section 22; using the designed axis of the branch ore passage as a reference line 23, drilling a group of blasting holes from the intermediate section to the main ore passage 20; filling the blasting hole group with explosive charges and detonating them, with the blasting debris falling into the main ore passage to form a branch ore passage.

[0039] In the above process, when determining the axis of the branch chute, it is essential to ensure that the axis of the branch chute intersects with the axis of the main chute 20. Only then can the constructed branch chute be aligned with the main chute, preventing situations where the main chute and branch chute only partially overlap or are misaligned and do not intersect. Of course, if... Figure 4 As shown, the error in the pitch angle of the branch chute has little impact on the chute docking; the important thing is that... Figure 5 As shown, this represents the error in the lateral angle of the branch chute. To achieve the aforementioned alignment requirements, before formal drilling, the applicant first drills a reference hole 24 along the axis (design axis) of the branch chute. The reference hole 24 penetrates the soil from a certain middle section 22 and enters the main chute 20. The angle difference (mainly lateral angle deviation) between the axis of the reference hole 24 (actual construction axis) and the design axis is measured. A central plane can be determined using the axis of the main chute 20 and the design axis of the branch chute, and the deviation of the actual construction axis from this plane is measured. For ease of measurement, the actual construction axis can be projected onto a horizontal plane, and the angle between the actual construction axis and the central plane in the top view is measured. Ideally, the actual construction axis should coincide with or be parallel to this plane. After adjusting the drilling angle of the drilling equipment according to the angle difference, the reference hole 24 is re-drilled until the axis of the reference hole 24 (actual construction axis) is located in the central plane. Specifically, the drilling angle is first adjusted to ensure that the actual construction axis is parallel to the central plane, and then the drilling angle is shifted to ensure that the actual construction axis is located in the central plane. Next, without changing the drilling angle of the drilling equipment, simply move the drilling equipment horizontally to drill the remaining holes of the blasting hole group parallel to the reference hole 24.

[0040] During the above process, a measuring mechanism needs to be installed at the intersection of the drill pipe of the reference hole 24 and the main chute 20 to measure the angle difference between the drill pipe (the actual construction axis of the reference hole 24) and the center plane. This can be combined with... Figure 5 Before construction, fix this mechanism into the main chute 20 according to the design parameters. Two points should be noted during fixing: First, the depth should be within the area where the drill pipe breaks through the main chute 20. Figure 4 As shown; secondly, the vertical symmetry plane of this mechanism coincides with the central plane (the plane formed by the main chute axis and the branch chute design axis), as shown. Figure 5 As shown.

[0041] Specifically, the drill pipe angle measuring mechanism includes a frame and a measuring frame mounted on the frame, such as... Figure 1 As shown, Figure 1 The fixing device is not shown; only the measuring mechanism body is shown. The fixing device can be set as needed and is not part of the measuring mechanism.

[0042] The frame includes two end frames and a connecting cylinder. The two end frames are spaced apart, and the connecting cylinder connects the two end frames. The frame as a whole is dumbbell-shaped.

[0043] The measuring frame consists of two sets, each including two side rods 44 and one measuring rod 41. The two side rods 44 are vertically connected to both ends of the measuring rod 41, which is the measuring end. The other ends of the two side rods 44 are rotatably connected to the two end frames of the frame, which is the driving end.

[0044] Side bar 44 is a telescopic bar, such as an electric telescopic bar;

[0045] The frame is equipped with a drive mechanism to drive the measuring frame to rotate around the axis of the connecting cylinder. The rotation of the two sets of measuring frames is controlled independently.

[0046] Distance sensors 43 are provided at one and / or both ends of the measuring rod 41, with the measuring direction facing the other end of the measuring rod 41.

[0047] The main working principle of the measuring mechanism in the above embodiments is as follows:

[0048] Initially, the two sets of measuring frames are spread out in a V-shape and face the area where the drill pipe will break through the main chute 20.

[0049] After the drill pipe breaks through the borehole wall of the main chute, the two sets of measuring frames of the measuring mechanism move relative to each other (clamping towards the middle) until their respective measuring rods 41 contact the two sides of the drill pipe. At this time, the rotation angles of the two measuring rods 41 are recorded as I and J, respectively. The two measuring rods 41 clamp the drill pipe in the middle, and the angle between the angle bisectors of the two measuring rods 41 is the midpoint of I and J, recorded as A. The distance sensor 43 on the measuring rod 41 is activated, and the distance from the contact point between the drill pipe and the measuring rod 41 to the end of the measuring rod 41 is recorded as Z, and the length of the side rod 44 is recorded as Z. The degree is denoted as X. Point 1 in space can be constructed using (A, X, Z). After point 1 is determined, the two sets of measuring frames move in opposite directions (open), and the side rod 44 extends and retracts to change its length. The two sets of measuring frames move relative to each other again to clamp the drill pipe. After contacting the drill pipe at the new position, new data is obtained and denoted as point 2 (A2, X2, Z2). Points 1 and 2 can depict the axis of the rotating rod. The actual axis of the drill pipe is calculated using points 1 and 2. This is compared with the branch axis (or center plane) to obtain the deviation between the pre-drilling angle of the branch well and the center degree of the main well. To improve accuracy, multiple points can be measured using the above method, and a straight line can be fitted together from all points as the actual axis of the drill pipe.

[0050] In this embodiment, the measuring rod 41 of one set of measuring frames is longer than that of the other set of measuring frames. During the mutual rotation of the two sets of measuring frames, one set of measuring frames can enter the range of the other set of measuring frames. The beneficial effect is that the two sets of measuring frames will not collide during independent rotation, and the two sets of measuring frames can be attached to both sides of the drill rod at a minimum angle, with the center of the contact point on both sides as the axis of the drill rod.

[0051] In order to drive the two sets of measuring frames to operate independently, in one embodiment, a rotary power source is provided on each of the two end frames at both ends of the frame, and the axis of rotation coincides with the axis of the connecting cylinder.

[0052] In the two sets of measuring frames:

[0053] One side rod 44 of one set of measuring frames is rotatably connected to the rotation shaft of one of the rotating power sources, and is defined as the upper side rod 44 and the upper power source; the other side rod 44 is fixedly connected to the rotation shaft of the other rotating power source, and is defined as the lower side rod 44 and the lower power source.

[0054] In another set of measuring frames, the upper rod 44 is fixedly connected to the upper power source, and the lower rod 44 is rotatably connected to the lower power source;

[0055] The upper and lower power sources control the rotation angles of the two sets of measuring frames, respectively.

[0056] In another way, such as Figure 1 and Figure 2 As shown, each of the two end frames at both ends of the frame is fixedly equipped with a rotating support rod 45 coaxial with the connecting cylinder. The two end rods 44 of the two sets of measuring frames are rotatably connected to the rotating support rods 45 on the connecting cylinder. At the rotatable connection point, the outer end of the end rod 44 is provided with a tail rod 401. The end of the tail rod 401 is rotatably connected to a gear driven by a motor. An arc-shaped rack 12 that meshes with the gear is fixedly installed on the end frame.

[0057] When the motor drives the gear to rotate, the gear rolls along the arc-shaped rack 12, thereby driving the rotation of the measuring frame through the tail rod 401, forming a clamping action on the drill rod.

[0058] To increase the stability of the two sets of measuring frames, at the same end frame, the gears at the ends of the tail rods 401 of the two sets of measuring frames mesh with the same arc-shaped rack 12. The two gears are staggered in height and mesh with the upper and lower edges of the arc-shaped rack 12 respectively. Therefore, at the other end frame, the ends of the tail rods 401 of the two sets of measuring frames can also be connected in the same way, so that both ends have driving force and ensure the stability of the measuring frames under force.

[0059] In this embodiment, an arc-shaped piece 402 is fixed on the gear motor, and an arc-shaped groove is provided on the arc-shaped rack 12, such as... Figure 2 As shown, the arc-shaped piece 402 is inserted into the arc-shaped groove to slide and initiate the guiding function, which makes the rotation process of the measuring frame more stable.

[0060] Furthermore, a resistive patch 121 is provided along the arcuate direction at the edge of the arcuate groove, and an electrode 403 is provided on the arcuate plate 402. During the sliding of the arcuate plate 402 along the arcuate groove, the electrode 403 contacts the resistive patch 121 at different positions. By detecting the change in resistance, the rotation angle of the measuring frame can be calculated, and thus the position information of the drill rod (A above) can be calculated using the angle information of the two sets of measuring frames. During the rotation of the measuring frame, the distance sensor 43 on the measuring frame remains open. The distance sensor 43 can be an infrared ranging sensor, installed at one end of the measuring rod 41 and facing the other end. Before the measuring frame contacts the drill rod, such as... Figure 5 As shown, there are no obstructions on the measurement path of distance sensor 43, resulting in a large reading. Once the measuring frame rotates to the drill pipe, the drill pipe blocks the measurement path of distance sensor 43. At this time, the controller should control the measuring frame to stop rotating and use the data read by distance sensor 43 at this time to estimate the position information of the drill pipe (Z in the above text).

[0061] Alternatively, the motor may be equipped with an encoder that can convert the motor's rotation angle information into an electrical signal, and the position information of the drill rod can be obtained through this signal (A above).

[0062] In this embodiment, the side rod 44 is an electric telescopic rod. The tail end of the housing is connected to the frame, and the end of the telescopic shaft is connected to the measuring rod 41. The length of the side rod 44 can be determined based on the original length and the telescopic amount, and the position information of the drill rod (X in the above text) can be estimated.

[0063] By measuring the (A, X, Z) values ​​at multiple points on the drill rod, the spatial angle and position of the drill rod can be determined, which can then be compared with the design axis and the drilling rig parameters can be adjusted.

[0064] The following are the supporting measurement methods, which can be used in conjunction with this device, including the following steps:

[0065] Determine the angle of the branch pass: Based on the design drawings of the branch pass, determine the branch axis of the branch pass, identify the starting point of the branch axis at a certain intermediate section and set up the drilling rig, and determine the ending point of the branch axis at the main pass. The axis of the branch pass is usually designed according to the actual situation of the mine. In this step, the branch axis of the branch pass can be obtained by referring to the drawings of the underground mine construction plan.

[0066] Setting up the measuring device: Lower the carrier mechanism (carrying the measuring mechanism) along the main chute, adjust the depth and angle. When the two measuring frames of the measuring mechanism are located in the branch endpoint area and facing a certain middle section, the retraction and extension parts of the carrier mechanism move to fix the carrier mechanism and the measuring mechanism relative to the main chute. It should be noted that, to simplify the subsequent measurement and calculation process, the mid-plane of the rotation range of the two sets of measuring frames can be made to coincide with the central plane. Regarding the central plane, as mentioned earlier, it is a plane determined based on the axis of the main chute 20 and the design axis of the branch chute. Ideally, the axis of the branch chute should coincide with this plane.

[0067] After determining the location and angle of the branch chute by referring to the drawings, fix the measuring device at the intersection of the branch chute and the main chute and adjust its initial angle. Then, at the starting end of the branch chute, set up a drilling rig to drill a hole according to the designed position and angle; this hole is the pre-drilled hole. The drilling position and angle can be based on the designed axis of the branch chute. See below for reference:

[0068] Pre-drilled branch axis: The drill pipe is drilled along the branch axis from a certain middle section toward the main chute until the drill bit is drilled out of the main chute wall;

[0069] In theory, since the drill pipe advances from a certain section towards the main ore pass along the axis of the branch ore pass, its axis should be the same as the design parameters when it breaks through the borehole wall of the main ore pass; that is, the drill pipe axis should be aligned with the main ore pass, or the drill pipe axis should intersect the main ore pass axis. This ensures that subsequent branch ore passes formed by drilling this borehole will accurately connect with the main ore pass. However, in reality, even if the starting position and angle are strictly set according to the design parameters during the initial drilling, situations often arise where the drill pipe is not aligned with the main ore pass when it breaks through the borehole wall. If subsequent construction is based on this borehole, it may lead to situations where the constructed branch ore pass is not aligned with the main ore pass, or the branch ore pass grazes the sidewall of the main ore pass or even fails to intersect.

[0070] Therefore, it is necessary to measure the centering of the drill pipe. The centering here refers to the alignment between the pre-drilled angle of the branch well and the centering of the main well. Specifically, when the centering meets the standard, the branch well can be well aligned with the main well; when the centering does not meet the standard, the branch well and the main well may be misaligned. To avoid situations where the centering does not meet the standard, the axis of the branch well needs to be accurately positioned before proceeding with subsequent formal construction. After measuring the pre-drilled pipe, if the centering does not meet the standard, the drilling position and angle need to be adjusted based on the measurement results, the pre-drilled hole needs to be re-drilled, and the measurement repeated; this process continues until the pre-drilled hole meets the centering standard, at which point subsequent construction can proceed.

[0071] Specifically, the centering measurement is performed as follows: The two sets of measuring frames of the measuring mechanism move relative to each other until their respective measuring rods 41 contact the two sides of the drill pipe. At this time, the rotation angles of the two measuring rods 41 are recorded as I and J, respectively. The angle between the angle bisectors of the two measuring rods 41 is the midpoint of I and J, recorded as A, which can be understood as the pre-drilled rod axis position. The distance sensor 43 on the measuring rod 41 is activated, and the distance from the contact point between the drill pipe and the measuring rod 41 to the end of the measuring rod 41 is recorded as Z. The length of the side rod 44 is recorded as X. (A, X, Z) can be used to construct point one in space. The two sets of measuring frames move in opposite directions, and the side rod 44 extends and retracts to change its length. The two sets of measuring frames move relative to each other again to clamp the drill pipe. After contacting the drill pipe, new data is obtained and recorded as point two (A2, X2, Z2). The actual axis of the drill pipe is calculated using points one and two. The deviation between the pre-drilling angle of the branch well and the centering of the main well is obtained by comparing it with the branch axis.

[0072] Then, adjust the drill rod angle and starting position based on the deviation, drill again, and remeasure until the deviation is within the permissible range. Use this borehole as a reference for subsequent construction to ensure accurate connection between the branch chute and the main chute. In practice, first adjust the angle to make the borehole parallel to the center plane, then move the drilling rig to align the borehole with the center plane to meet the centering requirements.

[0073] In summary, this utility model effectively overcomes the various shortcomings of the prior art, produces beneficial technical effects, and has made significant progress.

[0074] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A drill pipe angle measuring mechanism for branch well construction, used to measure the exit angle of the drill pipe as it enters the main well from the branch well, characterized in that: Includes a frame and a measuring frame mounted on the frame; The frame includes two end frames and a connecting cylinder. The two end frames are spaced apart, and the connecting cylinder is connected between the two end frames. The frame as a whole is dumbbell-shaped. The measuring frame consists of two sets, each including two side rods (44) and one measuring rod (41). The two side rods (44) are vertically connected to both ends of the measuring rod (41), which is the measuring end. The other ends of the two side rods (44) are rotatably connected to the two end frames of the frame, which is the driving end. The frame is equipped with a drive mechanism for driving the measuring frame to rotate around the axis of the connecting cylinder, and the rotation of the two sets of measuring frames is controlled independently. Distance sensors (43) are provided at one and / or both ends of the measuring rod (41), with the measuring direction being towards the other end of the measuring rod (41).

2. The drill pipe angle measuring mechanism for branch well construction as described in claim 1, characterized in that: The measuring rod (41) of one set of measuring frames is longer than the measuring rod (41) of the other set of measuring frames. During the mutual rotation of the two sets of measuring frames, one set of measuring frames can enter the range of the other set of measuring frames.

3. The drill pipe angle measuring mechanism for branch well construction as described in claim 1, characterized in that: The side rod (44) is a telescopic rod.

4. The drill pipe angle measuring mechanism for branch well construction as described in claim 1, characterized in that, A rotary power source is provided on each of the two end frames at both ends of the frame, and the axis of rotation coincides with the axis of the connecting cylinder. In the two sets of measuring frames: One side rod (44) of one set of measuring frames is rotatably connected to the rotation shaft of one of the rotating power sources, and is defined as the upper side rod (44) and the upper power source; the other side rod (44) is fixedly connected to the rotation shaft of another rotating power source, and is defined as the lower side rod (44) and the lower power source. In another set of measuring frames, the upper rod (44) is fixedly connected to the upper power source, and the lower rod (44) is rotatably connected to the lower power source; The upper and lower power sources control the rotation angles of the two sets of measuring frames, respectively.

5. The drill pipe angle measuring mechanism for branch well construction as described in claim 1, characterized in that: On each of the two end frames at both ends of the frame, a rotating support rod (45) coaxial with the connecting cylinder is fixedly installed. The two end side rods (44) of the two sets of measuring frames are rotatably connected to the rotating support rods (45) on the connecting cylinder. At the rotatable connection point, a tail rod (401) is provided at the outer end of the side rod (44). A gear driven by a motor is rotatably connected to the end of the tail rod (401). An arc-shaped rack (12) meshing with the gear is fixedly installed on the end frame.

6. The drill pipe angle measuring mechanism for branch well construction as described in claim 5, characterized in that: At the same end frame, the gears at the ends of the tail rods (401) of the two sets of measuring frames mesh with the same arc rack (12), and the two gears are staggered in height and mesh with the upper and lower edges of the arc rack (12) respectively.

7. The drill pipe angle measuring mechanism for branch well construction as described in claim 6, characterized in that: An arc-shaped piece (402) is fixed on the motor of the gear, and an arc-shaped groove is provided on the arc-shaped rack (12). The arc-shaped piece (402) slides in the arc-shaped groove.

8. The drill pipe angle measuring mechanism for branch well construction as described in claim 7, characterized in that: A resistive patch (121) is provided along the arc direction at the edge of the arc-shaped groove, and an electrode (403) is provided on the arc-shaped patch (402). During the sliding process of the arc-shaped patch (402) along the arc-shaped groove, the electrode (403) contacts the resistive patch (121) at different positions. Alternatively, the motor may be equipped with an encoder that can convert the motor's rotation angle information into an electrical signal.

9. The drill pipe angle measuring mechanism for branch well construction as described in claim 3, characterized in that: The side rod (44) is an electric telescopic rod, with the tail end of the housing connected to the frame and the end of the telescopic shaft connected to the measuring rod (41).

10. The drill pipe angle measuring mechanism for branch well construction as described in claim 1, characterized in that: The distance sensor (43) is an infrared ranging sensor, which is installed at one end of the measuring rod (41) and facing the other end.

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