Torque monitoring device for cutting head of heading machine

Abstract

The utility model discloses a heading machine cutting head torque monitoring device which comprises a wireless torsion stress strain gauge testing module installed on a connecting shaft of a cutting head, the wireless torsion stress strain gauge testing module comprises two stress strain gauges and a control circuit board, and the number of the stress strain gauges is two. The two pieces are pasted in a groove formed in the connecting shaft in a crossed mode and arranged in the direction of 45 degrees with the axis of the connecting shaft, the two pieces are connected to a control circuit board, the control circuit board is fixedly connected in the groove, the groove is sealed and covered with a first sealing cover, and the control circuit board is connected to the thermoelectric power generation module through a cable. The torque of the cutting head is measured in real time by using the wireless torsion stress strain gauge test module, the change condition of resistance borne by the cutting head is monitored, and changed cutting parameters are correspondingly controlled, so that the mining safety of the heading machine is improved, and the increase of equipment maintenance cost caused by damage of cutting teeth of the cutting head is prevented; the tunneling safety is improved, and the problem that tunneling energy consumption is increased due to tunneling under long-term large friction is solved.

Description

Technical Field

[0001] This utility model belongs to the field of tunneling machine technology, specifically relating to a torque monitoring device for the cutting head of a tunneling machine. Background Technology

[0002] During the tunneling process of metal mine tunneling machines, the cutting teeth may be damaged due to changes in the hardness of the ore. Since it is impossible to monitor the specific operation of the cutting teeth, the tunneling machine cutting head continues to tunnel in rock layers of different hardness. Often, the damage is only discovered after the cutting teeth have been damaged, which increases the equipment maintenance cost. Moreover, construction under long-term high friction can easily lead to increased tunneling energy consumption.

[0003] In the prior art, Chinese patent application (application number 2024104634813) discloses an underground bauxite mining device and its operation method. This patent discloses the use of current mutation to monitor the torque change of the cutting head of the tunneling machine and the damage of the cutting teeth. However, since the change of current may also be caused by other reasons, it is easy to make misjudgments and cannot accurately monitor the operation of the cutting head, thus failing to provide an effective basis for the control of the corresponding cutting parameters. Utility Model Content

[0004] The purpose of this invention is to provide a torque monitoring device for the cutting head of a tunneling machine, which can directly monitor torque in real time and make accurate judgments.

[0005] The technical solution adopted by this utility model is a torque monitoring device for a tunneling machine cutting head, including a wireless torsional stress-strain gauge testing module. The wireless torsional stress-strain gauge testing module is installed on the connecting shaft of the cutting head and is used to detect its torsional stress. The wireless torsional stress-strain gauge testing module includes a stress-strain gauge and a control circuit board. Two stress-strain gauges are used and are cross-attached in a groove set on the connecting shaft and arranged at a 45° angle to the axis of the connecting shaft. The two stress-strain gauges are connected to the control circuit board, which is fixedly connected in the groove. The groove is sealed with a sealing cover. The control circuit board is connected to a thermoelectric generator module through a cable. A sealing sleeve is set at the point where the cable passes through the sealing cover.

[0006] Furthermore, it also includes a current sensor for the drive motor that drives the gearbox, which is used to monitor changes in the torsional torque of the cutting head.

[0007] Furthermore, the aforementioned wireless torsional stress-strain gauge testing module is connected to a thermoelectric power generation module, which is connected inside the cutting head. The wireless torsional stress-strain gauge testing module is installed on the connecting shaft located inside the cutting head.

[0008] Compared with existing technologies, the advantages of this utility model are that by using a wireless torsional stress strain gauge testing module to measure the torque of the cutting head in real time, it is possible to accurately monitor the changes in resistance experienced by the cutting head, and then promptly control and change the cutting parameters to improve the mining safety of the tunneling machine. This prevents the cutting head from continuously tunneling and damaging the cutting teeth when encountering hard rock layers, thus increasing equipment maintenance costs, improving tunneling safety, and avoiding the problem of increased tunneling energy consumption caused by long-term high friction tunneling, thereby achieving energy saving. Attached Figure Description

[0009] Figure 1 This is an assembly diagram of the torque monitoring device for the cutting head of a tunneling machine;

[0010] Figure 2 This is a top view of the installation structure of the linear torsional stress strain gauge testing module;

[0011] Figure 3 This is a side view of the installation structure of the linear torsional stress strain gauge testing module.

[0012] Figure 4 This is a side view diagram of the camera installation structure;

[0013] Figure 5 This is a schematic diagram of the camera installation structure viewed from below;

[0014] Figure 6 This is a schematic diagram of the rotating bracket installation structure. Detailed Implementation

[0015] The present invention will be further explained below with reference to the accompanying drawings to enable those skilled in the art to better understand it.

[0016] Example 1

[0017] like Figure 1-6As shown, the torque monitoring device for the cutting head of a tunneling machine includes a wireless torsional stress strain gauge testing module 2. The module 2 is mounted on the connecting shaft 401 of the cutting head 5 to detect its torsional stress. The cutting head 5 is mounted on the cantilevered tunneling machine body 1. The connecting shaft 401 of the cutting head 5 is rotatably connected to the telescopic part 6, with the end furthest from the cutting head 5 connected to the output shaft of the gearbox 7. The telescopic part 6 is connected to the gearbox 7 at the end furthest from the cutting head 5. By using the wireless torsional stress strain gauge testing module 2 to measure the torque of the cutting head 5 in real time, the device can accurately monitor changes in resistance experienced by the cutting head 5. This allows for timely control of changing cutting parameters to improve the tunneling machine's mining safety, prevent damage to the cutting teeth caused by continuous tunneling when the cutting head encounters hard rock formations, thus reducing equipment maintenance costs. It also improves tunneling safety and avoids increased energy consumption due to long-term high friction during tunneling, achieving energy savings. This method for determining cutting tooth damage, after multiple calibrations, is more accurate than pure current variation.

[0018] The wireless torsional stress-strain tester module 2 includes a stress-strain gauge 201 and a control circuit board. Two stress-strain gauges 201 are cross-attached to a groove 203 on the connecting shaft 401, arranged at a 45° angle to the axis of the connecting shaft 401. The two stress-strain gauges 201 are connected to the control circuit board 202, which is fixedly connected to the groove 203. The groove 203 is sealed with a sealing cap 204. The control circuit board 202 is connected to the thermoelectric generator module 13 via a cable 205. A sealing sleeve is provided where the sealing cap 204 passes through the cable 205. Using two stress-strain gauges to test torque improves testing accuracy and facilitates installation. Furthermore, the groove avoids occupying surface space and affecting the use of the connecting shaft, and the sealing cap prevents external influences, improving testing stability and reliability. The control circuit board 202 is fixedly connected to the groove 203 with screws and spring washers. The spring washers are placed between the control circuit board and the groove, maintaining a certain elasticity, which can dampen the vibration of the control circuit board.

[0019] Furthermore, it also includes a current sensor for the drive motor of the drive gearbox 7, which is used to monitor changes in the torsional torque of the cutting head 5.

[0020] To facilitate power supply to the wireless torsional stress-strain gauge module, the wireless torsional stress-strain gauge module 2 is connected to a thermoelectric generator module 13. The thermoelectric generator module is connected inside the cutting head 5. The wireless torsional stress-strain gauge module 2 is installed on the connecting shaft 401 located inside the cutting head 5. By setting up the thermoelectric generator module to supply power to the wireless torsional stress-strain gauge module, the heat generated by the cutting head is used to generate electricity to power the gauge module. This avoids interference caused by the power supply to the rotating cutting head and also saves energy. The thermoelectric generator can also meet the power supply requirements. High temperatures are generated during the cutting process of the cutting head, and the thermoelectric generator module is arranged using this high temperature to meet the power supply requirements, thereby reducing energy consumption and simplifying the wiring structure.

[0021] Example 2

[0022] like Figure 1-6 As shown, a cantilever tunneling machine, in addition to the structure of embodiment 1, also includes an infrared camera 3 and a high-definition camera 4 mounted on the telescopic part 6 via a hidden camera bracket 8. The infrared camera 3 and the high-definition camera 4 are used to detect the temperature of the cutting teeth and the condition of broken teeth of the cutting head, respectively. It also includes two annular spray pipes 9 of different sizes, fixedly connected to the rotating bracket 10 and arranged in a trumpet shape outside the telescopic part 6. The rotating bracket 10 is rotatably connected to the outer surface of the telescopic part 6 and is driven by the drive mechanism 12 to rotate back and forth within 180 degrees. Multiple spray heads 11 are arranged in a staggered ring on the annular spray pipes 9, and the multiple spray heads 11 face the cutting teeth of the cutting head 4. By setting two annular spray pipes and staggered spray heads, spraying is carried out in coordination with the back and forth rotation of the rotating bracket, which can effectively reduce dust, reduce water consumption, and avoid relying on water pressure to achieve large-area spraying, thus achieving better energy saving and environmental protection. Real-time torque measurement combined with temperature monitoring can accurately realize the change of resistance on the cutting head, and the secondary calibration of tooth breakage through the camera improves the detection accuracy, improves tunneling safety, and avoids the problem of increased tunneling energy consumption caused by long-term high friction tunneling, thus achieving energy saving.

[0023] The drive mechanism 12 includes a ring gear 1201, a drive gear 1202, and a swing drive motor 1203. The ring gear 1201 is fixedly connected to the rotating bracket 10 and located at one end of the cutting head. The drive gear 1202 meshes with the ring gear 1201 and is fixedly connected to the motor shaft of the swing drive motor 1203. The swing drive motor 1203 is fixedly connected to the telescopic part 6 via a motor frame 1204. The rotating bracket 10 is rotatably connected to the telescopic part 6 via a bearing 1205. The swing drive motor drives the rotating bracket to rotate within 180 degrees, providing rapid and stable operation. The 10 includes an inner ring 1001 and multiple bent pipes 1002. The inner ring 1001 is rotatably connected to the telescopic part 6 via a bearing 1205. The multiple bent pipes 1002 are uniformly fixedly connected to the inner ring 1001 in a circumferential direction and are bent towards the cutting head. The multiple bent pipes 1002 are fixedly connected to two annular spray pipes 9, and the top bent pipe 1002 serves as a water inlet pipe connected to the two annular spray pipes 9. The bent pipe 1002 is connected to the pumped water supply hose. The support is stable and reliable, and it also serves as a water inlet pipe, reducing the complexity of the equipment and reducing costs. Moreover, it can rotate within a 180° range without affecting the arrangement of the water supply pipe.

[0024] Meanwhile, a current sensor is used to monitor changes in the torsional torque of the cutting head. Torque, temperature, and camera-corrected temperature monitoring are combined to improve detection accuracy.

[0025] To achieve reliable and accurate results through comprehensive automatic analysis, the bauxite mining tunneling machine with monitoring capabilities also includes a monitoring and analysis module. This module integrates the detection data from the current detection module, the wireless torsional stress strain gauge test module 2, the infrared camera 3, and the high-definition camera 4 to determine the operating status of the cutting head. By automatically integrating current, torque, temperature, and camera data, the monitoring and analysis module improves the accuracy and reliability of the judgment, and increases the efficiency of the assessment.

[0026] To facilitate camera concealment and enhance protection, the camera bracket 8 comprises a camera mounting plate 801, a dual-rod cylinder 802, and a sealing cover 803. The camera mounting plate 801 is fixedly connected side-by-side to the infrared camera 3 and the high-definition camera 4. The camera mounting plate 801 is fixedly connected to the mounting plate 805, which is fixedly connected to the ends of the two cylinder rods of the dual-rod cylinder 802, via an L-shaped plate 804. The tail end of the cylinder seat of the dual-rod cylinder 802 is rotatably connected to a recess 807 on the top surface of the telescopic part 4 via a pitch axis 806. The tilt axis 806 is connected to a tilt motor 808 that drives its rotation. The tilt motor 808 is installed in a motor slot 809 on one side of the cavity 807. The sealing cover 803 covers the cavity 807, hiding the camera in the cavity. This effectively protects the camera and prevents damage to the camera from flying stones during the use of the cutting head, thus improving safety. The camera is driven by a cylinder telescopic mechanism, which facilitates height control and allows for coverage of different shooting ranges. The tilt motor controls the tilt angle, thereby achieving optimal tilt angle control.

[0027] To facilitate sealing of the cavity, the second sealing cover 803 is connected to four connecting posts 811 via four tension springs 810. The four connecting posts 811 are symmetrically fixed to the cylinder seat of the double-rod cylinder 802. The second sealing cover 803 includes a first sealing cover 812 and a second sealing cover 813. The length of the first sealing cover 812 is greater than that of the second sealing cover 813. The first sealing cover 812 is hinged to the second sealing cover 813, and the second sealing cover 813 is hinged to the cavity at the end away from the cutting head. In cavity 807, after the double-rod cylinder 802 rotates and is located in the concave cavity 807, it can elastically pull the first sealing cover 812 onto the sealing step 814 set at the cavity opening of the concave cavity 807. The second sealing cover 813 seals the cavity opening. A sponge layer 815 is set at the bottom of the concave cavity 807. The two-stage sealing cover, combined with four tension springs and connecting columns, can achieve rapid and reliable sealing of the cavity, avoid interference, and achieve automatic opening and closing during the rotation of the hydraulic cylinder, reducing power equipment, lowering costs, and saving energy.

[0028] Working principle of the tunneling machine: During the transverse cutting process, if the current sensor of the motor driving the cutting head 5 and the wireless torsional strain gauge testing module 2 arranged on the connecting shaft detect abrupt inflection points in the current curve and torque respectively, the feed rate of the cutting head 5 is halved, the rotation speed is increased by 20%, and the annular spray pipe is controlled to rotate back and forth, spraying water to cool the cutting teeth. If the current value and the torque of the cutting head are still twice the normal cutting value and maintained for a set time, the feed rate of the cutting head 5 is further reduced by one-third, the rotation speed is increased by 10%, and the current sensor and the wireless torsional strain gauge testing module 2 continue to detect the magnitude of the current and torque. The spray pipe operates under spraying and reciprocating conditions. When the current and torque meet the set range, the speed and feed rate are controlled for cutting. If the current and torque do not meet the set range, the cutting depth is reduced to one-third. The annular spray pipe operates under spraying and reciprocating conditions. If the current and torque meet the corresponding set range, the cutting is maintained. If not, the cutting is stopped, and the cutting head is rotated slowly. Infrared camera 3 is used to detect the temperature of the cutting head and cutting teeth, and high-definition camera is used to collect images of the cutting head. If the collected temperature is higher than the set value, and the images taken by the high-definition camera are compared to confirm whether there are broken teeth, the tunneling machine is stopped, and the cutting teeth are repaired or the cutting head 5 is replaced.

[0029] The advantage of this invention lies in the real-time monitoring of the interaction between current and torque, enabling precise monitoring of the force changes on the cutting head. This allows for corresponding control of the cutting head's feed rate, effectively preventing damage caused by excessive force due to factors such as increased bauxite hardness, thus improving the safety of the cutting head. After repeated adjustments to the feed rate and depth, and manual improvements such as reducing the speed, an infrared temperature camera is used for effective monitoring. This detects cutting teeth with excessively high temperatures and performs secondary calibration using the camera to check for damage to the cutting head's cutting teeth. Based on this, an effective improvement method is proposed. This method for determining cutting tooth damage, after multiple calibrations, is more accurate than using pure current changes.

[0030] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from its design spirit and principles should fall within the protection scope defined by the claims of the present invention.

Claims

1. A torque monitoring device for a tunneling machine cutting head, characterized in that, The device includes a wireless torsional stress strain gauge test module (2), which is installed on the connecting shaft (401) of the cutting head (5) to detect its torsional stress. The wireless torsional stress strain gauge test module (2) includes a stress strain gauge (201) and a control circuit board (202). Two stress strain gauges (201) are used, which are cross-attached in the groove (203) set on the connecting shaft (401) and arranged at a 45° angle to the axis of the connecting shaft (401). The two stress strain gauges (201) are connected to the control circuit board (202). The control circuit board (202) is fixedly connected in the groove (203). The groove (203) is sealed with a sealing cover (204). The control circuit board (202) is connected to the thermoelectric generator module (13) through a cable (205). A sealing sleeve is set at the point where the sealing cover (204) passes through the cable (205).

2. The tunneling machine cutting head torque monitoring device according to claim 1, characterized in that, It also includes a current sensor for the drive motor of the drive gearbox (7), which is used to monitor the change in the torsional torque of the cutting head.

3. The torque monitoring device for the cutting head of a tunneling machine according to claim 1, characterized in that, The wireless torsional stress strain gauge test module (2) is connected to the thermoelectric generator module (13), which is connected inside the cutting head (5). The wireless torsional stress strain gauge test module (2) is installed on the connecting shaft (401) located inside the cutting head (5).

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