Mining laser gradient digital display measuring instrument for underground curve tunneling

Abstract

The invention relates to the technical field of gradient measurement, and discloses a mining underground curve tunneling laser gradient digital display measuring instrument which comprises a shell and mounting cavities formed in adjacent side walls of the shell, and a sensing assembly used for receiving and feeding back gradient changes in real time is mounted in each mounting cavity. According to the equipment, through a shell, mounting cavities, a sensing assembly and a recording part, when a vehicle body inclines, a lead block is kept perpendicular due to gravity, so that a first gear is fixed, a toothed bar slides obliquely along with the vehicle body and drives a recording pen to draw lines on constant-speed transmission recording roll paper driven by a driving motor, and the mounting cavities of the adjacent side walls of the shell are provided with corresponding assemblies; the purpose of synchronously measuring the gradient in the front-back direction and the left-right direction of the tunnel at a time without overturning equipment is achieved, the problems that overturning correction is needed in traditional measurement, time is wasted, and deviation is prone to being generated are effectively solved, and the measurement speed and accuracy are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of slope measurement equipment technology, and in particular to a laser slope digital display measuring instrument for underground tunneling in mines. Background Technology

[0002] The slope control in underground tunnel excavation is directly related to the project quality and construction safety. The working environment is complex, with mine tunnels often reaching depths of thousands of meters, and is accompanied by strong electromagnetic interference, high humidity, high dust, and strong vibration, which interfere with the normal operation of electronic measuring equipment. Traditional slope measuring equipment requires multiple surveyors to first plan the distance and segmentation within the mine tunnel before measurement, and mark the fixed positions. Then, the surveyors use traditional slope measuring equipment to aim and measure each point in the narrow and complex underground tunnel, and finally record, summarize and analyze the data.

[0003] Traditional tunnel slope measurement equipment still has the following shortcomings: First, traditional slope measurement tools can only measure the longitudinal slope in the forward direction in a single measurement. If the transverse slope at the curve of the tunnel needs to be measured, the direction of the measuring tool needs to be flipped. After flipping, the surveyor needs to correct the measuring tool again, which is tedious and time-consuming. In addition, deviations from the marked point are easy to occur during the flipping process. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing traditional slope measuring tools have the disadvantage of single measurement direction and need to be repeatedly adjusted and measured. To address this, we propose a laser slope digital display measuring instrument for underground tunneling in mines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a laser slope digital display measuring instrument for underground tunneling in mines, comprising a shell and mounting cavities opened on adjacent side walls of the shell. Each set of mounting cavities is equipped with a sensing component for receiving and feeding back slope changes in real time. Two sets of fixed brackets are symmetrically fixedly connected to the inner wall of the mounting cavity and on one side of the recording pen. A recording component for cooperating with the sensing component to record slope change data is rotatably installed between the two sets of fixed brackets.

[0006] The sensing component includes a first gear rotatably connected to the inner wall of the mounting cavity via a damping bearing. A heavy lead block is fixed to the lower surface of the first gear. A second laser end is fixed to the center of the outer wall of the first gear away from the mounting cavity via a connecting rod. A gear rod is slidably mounted on the inner wall of the mounting cavity above the first gear. The lower surface of the gear rod is provided with teeth that mesh with the first gear. A recording pen is inserted and fixed to the outer wall of one end of the gear rod.

[0007] The recording component includes a take-up roller, a material roller, and multiple sets of fixed rollers rotatably connected between two sets of fixed supports. The two sets of fixed rollers are horizontally symmetrical. Recording rolls are wound and sleeved on the outer walls of the take-up roller, material roller, and multiple sets of fixed rollers. A drive motor is fixedly installed on one side of the outer wall of one set of fixed supports, and the output shaft of the drive motor is fixed to the center of one end of the take-up roller through a coupling.

[0008] A marking component for fixed-distance marking is movably mounted on the lower surface of one side of the outer wall of the housing.

[0009] Preferably, a blocking pad that fits against the inner wall of the mounting cavity is embedded in one side of the outer wall of the lead block, a T-shaped slider with a cross-sectional shape of the English letter T is fixed on the upper surface of the toothed rod, a limiting sleeve that matches the shape and size of the T-shaped slider is fixed in the inner wall of the mounting cavity, a sealing cover is embedded in the opening of the mounting cavity, and the connecting rod passes through the sealing cover.

[0010] Preferably, the contact point between the toothed rod and the recording pen has a circular shape and a size slightly larger than the recording pen's insertion hole, the recording roll is always taut, and the drive motor always drives the take-up roller to rotate at a uniform speed.

[0011] Preferably, the outer shell has an internal cavity for storing talc powder, and a fan-shaped discharge port communicating with the cavity is provided at the center of the lower surface of the outer shell. A circular inlet is provided on one side of the upper surface of the outer shell, and an inlet cap is threaded onto the inner wall of the inlet.

[0012] Preferably, the marking component includes a worm gear rotatably connected to the lower surface of the housing, and the axis of the worm gear coincides with the axis of the discharge port. The surface of the worm gear has a discharge hole with the same cross-sectional area as the fan-shaped discharge port.

[0013] Preferably, a worm is rotatably mounted on the lower surface of the housing and at a position on one side of the worm wheel, the worm being meshed with the worm wheel, and two sets of swing rods are symmetrically rotatably mounted on one side of the lower surface of the housing via support rods.

[0014] Preferably, a pressure wheel is rotatably connected to the middle position of the outer wall of one end of the two sets of swing rods, a third gear is fixed at the axial center position of one side of the pressure wheel, and a second gear is rotatably connected to the outer wall of the other end of the two sets of swing rods.

[0015] Preferably, a shaft is fixed at the center of the second gear, and the shaft passes through the hinge joint between the rocker arm and the support rod. One end of the worm gear meshes with the shaft through a transmission component. A torsion spring is installed at the hinge joint between the rocker arm and the support rod, and the two ends of the torsion spring are respectively engaged and fixed to the support rod and the rocker arm.

[0016] Preferably, a first laser end is fixed at the middle position of the upper surface of the housing, and universal wheels are fixedly installed at the four corners of the lower surface of the housing. A drive unit and power module for uniformly starting the drive motor are installed inside the mounting cavity.

[0017] Preferably, multiple sets of grid baffles are symmetrically fixed inside the ash-containing cavity, and a push rod is hinged to one side of the upper surface of the outer shell.

[0018] The technical effects and advantages of this invention are as follows:

[0019] In this invention, the device, consisting of a housing, mounting cavity, sensing components, and recording components, utilizes the gravity of a lead block to keep the first gear fixed when the vehicle body is tilted. The gear rack slides with the tilt of the vehicle body and drives the recording pen to draw lines on the uniformly transmitted recording roll paper driven by the drive motor. The mounting cavities on adjacent side walls of the housing are equipped with corresponding components, enabling the single-time synchronous measurement of the slope in the front-to-back and left-to-right directions of the tunnel without flipping the device. This effectively solves the problems of traditional measurement requiring flipping and correction, being cumbersome and time-consuming, and prone to deviation, and significantly improves the measurement speed and accuracy.

[0020] In this invention, the device uses a marking component, a ash-containing chamber, and a grid baffle plate. With the help of the torsion spring preload, the swing arm drives the pressure roller to press firmly against the ground. The rotation of the pressure roller drives the worm gear to rotate intermittently through gear transmission, aligning the discharge hole of the worm gear with the discharge port of the ash-containing chamber to achieve fixed-distance talc powder dispensing. At the same time, the grid baffle plate prevents the talc powder from shaking significantly, achieving the purpose of automatic fixed-distance marking during tunnel measurement. This provides clear position guidance for subsequent measurement verification and data traceability, and reduces the equipment's center of gravity shift and shaking amplitude, ensuring measurement stability. Attached Figure Description

[0021] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the bottom structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the mapping component structure of the present invention;

[0025] Figure 4 This is a cross-sectional view of the side structure of the device of the present invention;

[0026] Figure 5 This is a detailed schematic diagram of the sensing component structure of the present invention;

[0027] Figure 6This is a schematic diagram of the back structure of the lead block in the sensing component of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the surveying component under the tilted state of the outer shell of the present invention;

[0029] Figure 8 This is a schematic diagram of the marking component structure of the present invention.

[0030] Legend: 1. Outer shell; 101. Mounting cavity; 102. Grille baffle; 11. First laser end; 12. Dispensing port cover; 13. Caster wheel; 14. Push rod; 2. Sensing component; 21. First gear; 22. Lead block; 221. Blocking pad; 23. Second laser end; 24. T-shaped slider; 25. Toothed rod; 26. Take-up roller; 261. Material roller; 262. Fixed roller; 263. Drive motor; 27. Recording roll paper; 28. Recording pen; 3. Marking component; 31. Worm gear; 32. Worm; 33. Swing rod; 34. Second gear; 341. Shaft; 35. Pressure roller; 351. Third gear. Detailed Implementation

[0031] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0032] Reference Figure 1-8 As shown, the present invention provides a technical solution: a laser slope digital display measuring instrument for underground tunneling in mines, including a housing 1 and mounting cavities 101 opened on adjacent side walls of the housing 1. Each mounting cavity 101 is equipped with a sensing component 2 for receiving and feeding back slope changes in real time. Two sets of fixed brackets are symmetrically fixedly connected to the inner wall of the mounting cavity 101 and on one side of the recording pen 28. A recording component for cooperating with the sensing component 2 to record slope change data is rotatably installed between the two sets of fixed brackets.

[0033] The sensing component 2 includes a first gear 21 rotatably connected to the inner wall of the mounting cavity 101 via a damping bearing. A heavy lead block 22 is fixed to the lower surface of the first gear 21. A second laser end 23 is fixed to the center of the outer wall of the first gear 21 away from the mounting cavity 101 via a connecting rod. A rack 25 is slidably mounted on the inner wall of the mounting cavity 101 above the first gear 21. The lower surface of the rack 25 is provided with teeth that mesh with the first gear 21. A recording pen 28 is inserted and fixed to the outer wall of one end of the rack 25.

[0034] The recording component includes a take-up roller 26, a feed roller 261, and multiple sets of fixed rollers 262 rotatably connected between two sets of fixed supports. The two sets of fixed rollers 262 are horizontally symmetrical. Recording rolls 27 are wound and sleeved on the outer walls of the take-up roller 26, the feed roller 261, and the multiple sets of fixed rollers 262. A drive motor 263 is fixedly installed on one side of the outer wall of one set of fixed supports, and the output shaft of the drive motor 263 is fixed to the center of one end of the take-up roller 26 through a coupling.

[0035] A marking component 3 for fixed-distance marking is movably mounted on the lower surface of one side of the outer wall of the outer casing 1.

[0036] The surveyor first turns on the first laser end 11 and the second laser end 23, aligns the emitted laser beam with the tunnel, and then starts the drive motor 263 through the control panel. The control panel is connected to the drive unit, power module and drive motor 263 inside the mounting cavity 101 through wires. At this time, the drive motor 263 drives the take-up roller 26 in the recording component to rotate, continuously driving the taut recording paper roll 27 to move and form a flowing "recording plane".

[0037] Then, holding the push rod 14, push the entire device forward. During this forward movement, when the device reaches a slope (which includes both forward and backward and left and right directions), for example, when the front caster 13 encounters a low-lying area while the rear caster 13 remains at the same height, the entire device will tilt forward. At this time, the gear 25 will tilt as a whole. However, due to the large weight of the lead block 22, the lead block 22 is affected by gravity (the line of gravity is perpendicular to the horizontal plane), causing the first gear 21 to remain stationary. Because the entire device and gear 25 tilt forward, the gear 25 is subjected to a reaction force and slides to one side. During this sliding motion, the recording pen 28 moves along with the gear 25. The recording pen 28, while in a constant-speed transmission state, draws a diagonal line on the upper surface of the roll paper 27 to record the slope change. The diagonal line becomes steeper when the vehicle moves to a point with a larger slope, and vice versa for a smaller slope. This allows for real-time recording of the slope change inside the tunnel, and only one person is needed to complete the rapid measurement. Since the sensing component 2 and the corresponding recording components are installed on multiple side walls of the outer casing 1, the surveyor can obtain the slope change inside the tunnel in a single measurement. This eliminates the need for the surveyor to rotate the equipment at a certain angle and recalibrate the equipment before taking a measurement. The measurement method is simple and quick, greatly improving the overall measurement speed.

[0038] Reference Figure 1-8As shown in this embodiment: a blocking pad 221 that fits against the inner wall of the mounting cavity 101 is embedded in one side of the outer wall of the lead block 22; a T-shaped slider 24 with a cross-sectional shape of the English letter T is fixed on the upper surface of the toothed rod 25; a limiting sleeve that matches the shape and size of the T-shaped slider 24 is fixed on the inner wall of the mounting cavity 101; a sealing cover is embedded in the opening of the mounting cavity 101, and the connecting rod passes through the sealing cover.

[0039] The pad 221 can fit against the inner wall of the mounting cavity 101 to increase friction, and together with the damping bearing, it can reduce the rotation frequency of the first gear 21, filter out the slight shaking caused when the equipment passes over a small piece of rough road surface, and reduce the amount of recording.

[0040] The toothed bar 25 has a circular insertion hole at the contact point with the recording pen 28, which is slightly larger than the size of the recording pen 28. The recording paper roll 27 is always taut, and the drive motor 263 always drives the take-up roller 26 to rotate at a constant speed.

[0041] The upper surface of the socket is tubular, and a fastening bolt is spirally inserted through the outer wall of the curved surface of the tubular area. The recording pen 28 is quickly fixed by screwing in the fastening bolt. When the recording pen 28, power module and recording paper roll 27 need to be replaced, they can be replaced individually by simply opening the sealing cover.

[0042] The sealing cover plate and the sinkhole of the mounting cavity 101 are respectively provided with a locking structure.

[0043] The outer shell 1 has an internal ash-containing cavity for storing talcum powder, and a fan-shaped discharge port communicating with the ash-containing cavity is provided at the center of the lower surface of the outer shell 1. A circular feeding port is provided on one side of the upper surface of the outer shell 1, and a feeding port cover 12 is threaded onto the inner wall of the feeding port.

[0044] Reference Figure 2-8 As shown, in this embodiment: the marking component 3 includes a worm gear 31 rotatably connected to the lower surface of the housing 1, and the axis of the worm gear 31 coincides with the axis of the discharge port. The surface of the worm gear 31 is provided with a discharge hole with the same cross-sectional area as the fan-shaped discharge port.

[0045] A worm 32 is rotatably mounted on the lower surface of the outer casing 1 and on one side of the worm wheel 31. The worm 32 is meshed with the worm wheel 31. Two sets of rocker arms 33 are symmetrically rotatably mounted on one side of the lower surface of the outer casing 1 via a support rod.

[0046] A pressure wheel 35 is rotatably connected to the middle position of the outer wall of one end of the two sets of swing rods 33. A third gear 351 is fixed at the axis position on one side of the pressure wheel 35. A second gear 34 is rotatably connected to the outer wall of the other end of the two sets of swing rods 33.

[0047] The pressure roller 35 has a circumference of 10 cm. The transmission ratio of the third gear 351 and the second gear 34 is 1:2. The transmission ratio of the second gear 34 to the worm 32 via the transmission bevel gear is 1:1, while the transmission ratio of the worm 32 to the worm wheel 31 is 1:5. Therefore, when the pressure roller 35 rotates 10 times on the ground, the worm wheel 31 rotates one revolution, that is, the discharge hole and the fan-shaped discharge port are completely aligned. This allows for intermittent feeding of talcum powder into the ash-containing cavity. Specifically, a long "white marking line" is automatically marked every 50 cm. When the surveyor verifies the situation on-site, they only need to take the middle position of the white marking line. At the same time, the white marking line can reflect the slope change at that position.

[0048] A shaft 341 is fixed at the axial position of the second gear 34, and the shaft 341 passes through the hinge joint between the rocker arm 33 and the support rod. One end of the worm gear 32 meshes with the shaft 341 through a transmission component. A torsion spring is installed at the hinge joint between the rocker arm 33 and the support rod, and the two ends of the torsion spring are respectively engaged and fixed to the support rod and the rocker arm 33.

[0049] The torsion spring, through its preload, always drives the swing arm 33 to press firmly against the ground, ensuring that the pressure roller 35 can keep close to the ground. This can filter out some small potholes. At the same time, the flat pressure roller 35 can form a "V" shaped marking line on the road surface during driving, providing some reference guidance for subsequent surveyors to find the source of measurement.

[0050] Reference Figure 1-8 As shown in this embodiment: a first laser end 11 is fixed at the middle position of the upper surface of the outer shell 1, and universal wheels 13 are fixedly installed at the four corners of the lower surface of the outer shell 1. The drive unit and power module for uniformly starting the drive motor 263 are installed inside the mounting cavity 101.

[0051] Multiple sets of grid baffles 102 are symmetrically fixed inside the ash-containing cavity, and a push rod 14 is hinged to one side of the upper surface of the outer shell 1.

[0052] The multiple sets of grid baffles 102 can prevent the talcum powder inside the equipment body from shaking or flowing excessively when the equipment body is tilted, thus reducing the shaking amplitude of the equipment.

[0053] Working principle: First, the surveyor turns on the first laser end 11 and the second laser end 23 through the control panel, aligns the emitted laser beam with the tunnel, and then starts the drive motor 263. The control panel is connected to the drive unit, power module and drive motor 263 inside the mounting cavity 101 through wires. The drive motor 263 drives the take-up roller 26 in the recording component to rotate, continuously driving the taut recording paper roll 27 to move, forming a flowing "recording plane".

[0054] Secondly, traditional slope measuring tools can only measure the longitudinal slope in the forward direction at a time. To measure the lateral slope at the curve of the tunnel, the measuring tool needs to be flipped. After flipping, the surveyor needs to correct the measuring tool again, which is tedious and time-consuming. In addition, the flipping process is prone to deviation from the marked point. This solution solves the problem by opening mounting cavities 101 on the adjacent side walls of the outer shell 1. Each set of mounting cavities 101 is equipped with a sensing component 2 and a recording component. The slope measurement in the front-back and left-right directions can be completed simultaneously without flipping the device, which fundamentally solves the traditional problem.

[0055] Next, by holding the push rod 14, the entire device is pushed forward. When the device travels to the slope, the vehicle body will tilt with the slope. The gear 25 tilts along with the entire vehicle body. The lead block 22 in the sensing component 2, due to its large weight, remains vertical due to gravity, thus keeping the first gear 21 from rotating. As the vehicle body and gear 25 tilt, the gear 25 slides to one side due to the reaction force. During the sliding of the gear 25, the recording pen 28 moves together. The recording pen 28 draws a diagonal line reflecting the slope change on the recording roll 27, which is in a state of uniform transmission. When the vehicle body travels to a point with a larger slope, the diagonal line is steeper. The smaller the slope, the gentler the diagonal line. Through the sensing components 2 and recording components on different side walls of the outer casing 1, the slope change data in the front and back and left and right directions of the tunnel can be obtained simultaneously in a single measurement.

[0056] Meanwhile, the pad 221 in the sensing component 2 adheres to the inner wall of the mounting cavity 101 to increase friction, and together with the damping bearing, it slows down the rotation frequency of the first gear 21, filtering out the slight shaking caused when the device passes over a small piece of rough road surface, reducing the amount of invalid recordings. The T-shaped slider 24 on the rack 25 cooperates with the limiting sleeve on the inner wall of the mounting cavity 101 to ensure the stability of the rack 25 during the sliding process. The sealing cover at the opening of the mounting cavity 101 is fixed by a snap-fit ​​structure. The recording pen 28, power module and recording roll 27 can be replaced separately by opening the sealing cover, which is convenient to operate.

[0057] Next, the marking component 3 begins to work synchronously. The torsion spring at the hinge shaft of the swing arm 33 and the support rod always drives the swing arm 33 to press firmly against the ground through the preload, ensuring that the pressure roller 35 can stick to the ground and filter out some small potholes. At the same time, the overall flat pressure roller 35 can form a V-shaped marking line on the road surface during the journey, providing reference guidance for the surveyor to find the measurement source.

[0058] Next, as the equipment moves forward, the pressure roller 35 rotates along the ground, driving the third gear 351 at its axis to rotate. The third gear 351 drives the second gear 34 to rotate through a set transmission ratio. The second gear 34 meshes with the worm gear 32 through a transmission bevel gear at a set transmission ratio. The worm gear 32 then meshes with the worm wheel 31. According to the transmission ratio set for each component, after the pressure roller 35 rotates a specific number of times along the ground, the worm wheel 31 rotates one revolution. At this time, the discharge hole on the surface of the worm wheel 31 is completely aligned with the fan-shaped discharge port of the ash-containing chamber, realizing the intermittent feeding of talc powder inside the ash-containing chamber. A long white marking line is automatically marked. When the surveyor verifies on-site, only the middle position of the white marking line needs to be taken. At the same time, the white marking line can reflect the slope change at this position. The multiple sets of grid baffles 102 inside the ash-containing chamber can prevent the talc powder inside the equipment from shaking or flowing significantly when the equipment body is tilted, causing the center of gravity to shift, and reducing the shaking amplitude of the equipment.

[0059] Finally, through the collaborative work of the sensing component 2 and the recording component, this solution eliminates the need to flip the equipment and recalibrate. Only one person is required to complete the rapid and accurate measurement of the slope in the front, back and left and right directions of the tunnel. This avoids the deviation caused by flipping the equipment in traditional measurement and greatly improves the overall measurement speed. At the same time, the marking component 3 realizes automatic marking at fixed distances, providing clear guidance for subsequent verification and traceability, and ensuring the accurate correlation between the measurement data and the actual location.

[0060] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A laser slope digital display measuring instrument for underground tunneling in mines, characterized in that, The device includes an outer shell and mounting cavities opened on adjacent side walls of the outer shell. Each set of mounting cavities is equipped with a sensing component for receiving and feeding back slope changes in real time. Two sets of fixing brackets are symmetrically fixedly connected to the inner wall of the mounting cavity and on one side of the recording pen. A recording component for cooperating with the sensing component to record slope change data is rotatably installed between the two sets of fixing brackets. The sensing component includes a first gear rotatably connected to the inner wall of the mounting cavity via a damping bearing. A heavy lead block is fixed to the lower surface of the first gear. A second laser end is fixed to the center of the outer wall of the first gear away from the mounting cavity via a connecting rod. A gear rod is slidably mounted on the inner wall of the mounting cavity above the first gear. The lower surface of the gear rod is provided with teeth that mesh with the first gear. A recording pen is inserted and fixed to the outer wall of one end of the gear rod. The recording component includes a take-up roller, a material roller, and multiple sets of fixed rollers rotatably connected between two sets of fixed supports. The two sets of fixed rollers are horizontally symmetrical. Recording rolls are wound and sleeved on the outer walls of the take-up roller, material roller, and multiple sets of fixed rollers. A drive motor is fixedly installed on one side of the outer wall of one set of fixed supports, and the output shaft of the drive motor is fixed to the center of one end of the take-up roller through a coupling. A marking component for fixed-distance marking is movably mounted on the lower surface of one side of the outer wall of the housing.

2. The laser slope digital display measuring instrument for underground tunneling in mines according to claim 1, characterized in that: The lead block has a stop pad embedded in one side of its outer wall that fits against the inner wall of the mounting cavity. The upper surface of the toothed rod is fixed with a T-shaped slider with a cross-sectional shape of the English letter T. The inner wall of the mounting cavity is fixed with a limiting sleeve that matches the shape and size of the T-shaped slider. A sealing cover is embedded in the opening of the mounting cavity, and the connecting rod passes through the sealing cover.

3. The laser slope digital display measuring instrument for underground curved tunneling in mining as described in claim 1, characterized in that: The toothed bar has a circular opening at the contact point with the recording pen, which is slightly larger than the pen's insertion hole. The recording roll is always taut, and the drive motor always drives the take-up roller to rotate at a constant speed.

4. The laser slope digital display measuring instrument for underground curved tunneling in mining as described in claim 1, characterized in that: The shell has an internal cavity for storing talcum powder, and a fan-shaped outlet communicating with the cavity is located at the center of the lower surface of the shell. A circular inlet is located on one side of the upper surface of the shell, and an inlet cap is threaded onto the inner wall of the inlet.

5. The laser slope digital display measuring instrument for underground tunneling in mines according to claim 1, characterized in that: The marking component includes a worm gear rotatably connected to the lower surface of the housing, and the axis of the worm gear coincides with the axis of the discharge port. The surface of the worm gear has a discharge hole with the same cross-sectional area as the fan-shaped discharge port.

6. The laser slope digital display measuring instrument for underground tunneling in mines according to claim 1, characterized in that: A worm is rotatably mounted on the lower surface of the housing, located on one side of the worm wheel. The worm is meshed with the worm wheel. Two sets of swing rods are symmetrically rotatably mounted on one side of the lower surface of the housing via support rods.

7. A laser slope digital display measuring instrument for underground curved tunneling in mining, as described in claim 6, characterized in that: A pressure wheel is rotatably connected to the middle position of the outer wall of one end of the two sets of swing rods. A third gear is fixed at the axial center position of one side of the pressure wheel. A second gear is rotatably connected to the outer wall of the other end of the two sets of swing rods.

8. A laser slope digital display measuring instrument for underground tunneling in mines according to claim 7, characterized in that: A shaft is fixed at the center of the second gear, and the shaft passes through the hinge joint between the rocker arm and the support rod. One end of the worm gear meshes with the shaft through a transmission component. A torsion spring is installed at the hinge joint between the rocker arm and the support rod, and the two ends of the torsion spring are respectively engaged and fixed to the support rod and the rocker arm.

9. A laser slope digital display measuring instrument for underground tunneling in mines according to claim 1, characterized in that: The first laser end is fixed at the middle position of the upper surface of the housing, and universal wheels are fixedly installed at the four corners of the lower surface of the housing. The drive unit and power module for uniformly starting the drive motor are installed inside the mounting cavity.

10. A laser slope digital display measuring instrument for underground curved tunneling in mining, as described in claim 4, characterized in that: The ash-containing cavity has multiple sets of grid baffles symmetrically fixed inside, and a push rod is hinged to one side of the upper surface of the outer shell.

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