Fan temperature measuring equipment based on fluorescent optical fiber

Abstract

The invention relates to the technical field of temperature measuring equipment, in particular to fan temperature measuring equipment based on fluorescent optical fibers. The draught fan temperature measuring equipment based on the fluorescent optical fibers comprises a draught fan body and a fluorescent optical fiber sensor, the fluorescent optical fiber sensor is installed in the draught fan body, the draught fan temperature measuring equipment further comprises a control box, a power source data composite cable, an installation frame, a clamping rod and the like, and the installation frame is installed on the top of the draught fan body; four clamping rods are connected to the middle of the mounting frame in a square distribution mode. The probe, the temperature measurement group and the multi-position probe group perform own functions and respectively perform temperature monitoring on key parts such as a bearing, the interior of a fan set and a stator, the probe directly collects fluorescence signals on the surface of the bearing, the temperature measurement group monitors airflow near an impeller and the temperature of mechanical parts, and the multi-position probe group realizes three-dimensional monitoring of a temperature field of the stator. And in combination with the temperature sensitive characteristic of the fluorescent material, the real-time temperature data of each part can be accurately obtained, and equipment faults caused by abnormal temperature can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature measurement equipment, and in particular to a fan temperature measurement equipment based on fluorescent optical fiber. Background Art

[0002] In the modern industrial field, as a core equipment for gas compression and transportation, fans are widely used in industries such as electric power, chemical industry, and metallurgy. Their stable operation is crucial for the continuity and safety of the production process. Temperature, as a key parameter reflecting the operating state of the fan, accurate temperature monitoring is an important means to prevent equipment failures and extend service life.

[0003] Currently, fan temperature monitoring mainly adopts two technologies: contact temperature measurement and non-contact temperature measurement. In contact temperature measurement technology, thermocouples and thermal resistors are commonly used temperature measurement elements. Thermocouples utilize the Seebeck effect to convert temperature changes into thermoelectric potentials, but there are problems such as slow response speed, susceptibility to electromagnetic interference affecting measurement accuracy, and in high-temperature and high-vibration environments, the connection points are prone to loosening or oxidation, resulting in performance degradation; although thermal resistors have high accuracy in medium and low-temperature measurements, they need to obtain voltage signals through current, and measurement errors will be generated due to self-heating effects after long-term use. Moreover, both of these elements need to be in direct contact with the measured part. For components such as high-speed rotating bearings and enclosed stator windings inside the fan, installation and maintenance are difficult, and measurement accuracy may also be affected due to poor contact.

[0004] Non-contact temperature measurement technology is represented by infrared temperature measurement. It calculates the temperature by detecting the infrared energy radiated from the surface of the object, without the need to contact the measured object, and can achieve remote measurement. However, this technology is significantly affected by environmental factors. Differences in the emissivity of the surface of the measured object, fluctuations in ambient temperature, and obstruction by dust or water vapor will all cause measurement result deviations, making it difficult to accurately reflect the true temperature of key components inside the fan, and it cannot penetrate deep into the equipment to effectively monitor hidden parts such as stator windings and bearings. Summary of the Invention

[0005] In order to overcome the disadvantages mentioned in the background art, the present invention provides a fan temperature measurement equipment based on fluorescent optical fiber.

[0006] The technical implementation solution of the present invention is as follows: A fan temperature measurement device based on a fluorescent optical fiber includes a fan body and a fluorescent optical fiber sensor. The fluorescent optical fiber sensor is installed inside the fan body. It also includes a control box, a power data composite cable, a mounting rack, a clamping rod, a wedge block, a connector, and a spring. A mounting rack is installed on the top of the fan body. Four clamping rods are connected along the square distribution in the middle of the mounting rack. The control box is installed between the four clamping rods in a clamping manner. The control box is provided with a special plug-in interface, which is electrically connected to the connection cable of the fluorescent optical fiber sensor in a plug-and-play manner. The right end of the control box is also connected to the power data composite cable by a plug-in interface. Wedge blocks are respectively slidably connected to both sides of the mounting rack. The wedge blocks clamp the control box, and the inner side surface of the wedge block is in an inclined shape and is in contact and cooperation with the control box. A spring is connected between the wedge block and the mounting rack. A connector is connected to the top of the wedge block. The power data composite cable and the connection cable penetrate through the corresponding connectors.

[0007] More preferably, the fluorescent optical fiber sensor includes a temperature measurement group, a probe, a connection cable, and a multi-bit probe group. A probe is connected to the bottom of the fluorescent optical fiber sensor. The probe penetrates inside the motor group, and the tip is aligned with the bearing. A temperature measurement group is connected to the left side of the fluorescent optical fiber sensor. There are three temperature measurement heads in the temperature measurement group, all of which penetrate inside the fan body for temperature measurement. A multi-bit probe group is connected to the right side of the fluorescent optical fiber sensor. The multi-bit probe group includes two arc-shaped optical fiber line probes and a straight probe. The arc-shaped optical fiber line probes and the straight probe are both embedded inside the fan body. A connection cable is connected to the top of the fluorescent optical fiber sensor.

[0008] More preferably, each probe of the fluorescent optical fiber sensor is made of a high-temperature resistant ceramic material and is provided with a fluorescent material coating. The coating is composed of a rare earth-doped aluminate fluorescent powder and a high-temperature resistant epoxy resin.

[0009] More preferably, the control box housing is made of cast aluminum material.

[0010] More preferably, a wear-resistant layer is provided on the inner side surface of the wedge block.

[0011] More preferably, it further includes a support rod, a rack, and a gear. Support rods are respectively connected to the middle position at the top of the mounting rack. A rack is slidably connected to the support rods. A gear is installed in the middle of the mounting rack through a shaft seat. The tooth surfaces of the two racks are arranged opposite to each other and jointly form a meshing transmission relationship with the gear.

[0012] More preferably, it further includes nuts. Threaded grooves are machined at the positions corresponding to the control box installation on each clamping rod. The nuts are installed on the clamping rods through the threaded grooves.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The fluorescence optical fiber sensor adopts a modular design. The probe, the temperature measurement group and the multi-position probe group each perform their own functions, and respectively monitor the temperature of key parts such as bearings, inside the fan group and the stator. The probe directly collects the fluorescence signal on the bearing surface. The temperature measurement group monitors the temperature of the air flow near the impeller and mechanical components. The multi-position probe group realizes the three-dimensional monitoring of the stator temperature field. Combining with the temperature-sensitive characteristics of the fluorescent material, the real-time temperature data of each part can be accurately obtained, effectively preventing equipment failures caused by abnormal temperatures.

[0014] 2. The components of the equipment adopt a detachable design. The bolt connections between the base and the fan group and the motor group, the detachable couplings of components such as the impeller and the rotating shaft, and the pluggable interfaces of the fluorescence optical fiber sensors facilitate the independent inspection and replacement of each component. The control box realizes quick disassembly and assembly through the linkage mechanism of the clamping rod, the wedge block and the rack and gear. When disassembling, pulling one side of the wedge block can drive both sides to loosen synchronously. When installing, it is automatically clamped and fixed, significantly improving the maintenance efficiency and reducing the maintenance cost and time cost.

[0015] 3. The mounting bracket cooperates with the clamping rod to provide basic support for the control box. The reinforcement design of the nut further enhances the installation stability of the control box, preventing the displacement or loosening of the control box caused by factors such as vibration during equipment operation. The wedge block and the control box are wedge-tightened and matched, and the connector guides and stabilizes the cable, improving the overall structural reliability and operation safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0017] Figure 2 is a three-dimensional structural schematic diagram of components such as the fan group, the impeller and the motor group of the present invention.

[0018] Figure 3 is a planar structural schematic diagram of components such as the stator, the rotating shaft and the bearing of the present invention.

[0019] Figure 4 is a three-dimensional structural schematic diagram of components such as the stator, the rotor fluorescence optical fiber and the sensor of the present invention.

[0020] Figure 5 is a three-dimensional structural schematic diagram of components such as the rotating shaft, the bearing and the probe of the present invention.

[0021] Figure 6 is a three-dimensional structural schematic diagram of components such as the temperature measurement group, the probe and the multi-position probe group of the present invention.

[0022] Figure 7 is a three-dimensional structural schematic diagram of components such as the control box, the power and data composite cable and the mounting bracket of the present invention.

[0023] Figure 8This is a three-dimensional structural schematic diagram of components such as the clamping rod, wedge block and connector of the present invention.

[0024] Figure 9 This is a three-dimensional structural schematic diagram of components such as the support rod, rack and gear of the present invention.

[0025] The markings of each component in the attached drawings are as follows: 1, base; 101, fan unit; 102, impeller; 2, motor unit; 201, stator; 202, rotor; 203, rotating shaft; 204, bearing; 3, fluorescent optical fiber sensor; 301, temperature measurement group; 302, probe; 303, connecting cable; 304, multi-probe group; 401, control box; 402, power data composite cable; 403, mounting bracket; 404, clamping rod; 405, wedge block; 406, connector; 407, spring; 501, support rod; 502, rack; 503, gear; 6, nut. Detailed implementation manners

[0026] Example 1: A fan temperature measurement device based on fluorescent optical fiber, as Figures 1-8As shown in the figure, it includes a fan body and a fluorescent optical fiber sensor 3. The fan body is specifically composed of a base 1, a fan unit 101, an impeller 102, a motor unit 2, a stator 201, a rotor 202, a rotating shaft 203, and a bearing 204. The fan unit 101 is installed on the top of the base 1 through bolts. The motor unit 2 is installed on the right side of the fan unit 101 through bolts. The impeller 102 is installed in the fan unit 101 through a shaft seat. The stator 201 is installed in the motor unit 2 through bolts. The rotor 202 is located at the center of the stator 201. An air gap (air clearance) is formed between the inner side of the stator 201 and the rotor 202. The stator 201 does not directly contact the rotor 202 and only transfers energy through magnetic field coupling. The rotor 202 is installed in the motor unit 2 through the bearing 204. The rotating shaft 203 is connected to the rotor 202 through a coupling. The left end of the rotating shaft 203 is connected to the inside of the housing through the bearing 204, and the left end of the rotating shaft 203 penetrates into the fan unit 101 and is connected to the central axis of the impeller 102. A fluorescent optical fiber sensor 3 is installed between the upper sides of the fan unit 101 and the motor unit 2, which is responsible for temperature monitoring of key parts. It also includes a control box 401, a power and data composite cable 402, a mounting bracket 403, a clamping rod 404, a wedge block 405, a connector 406, and a spring 407. The mounting bracket 403 is installed in the middle of the top of the motor unit 2 through bolts. Four clamping rods 404 are welded along the square distribution in the middle of the mounting bracket 403. The control box 401 is installed between the four clamping rods 404 in a clamping manner. The control box 401 is provided with a special plug-in interface, which can realize quick plug-and-play electrical connection with the connection cable 303 of the fluorescent optical fiber sensor 3. The right end of the control box 401 is also connected to the power and data composite cable 402 through a plug-in interface. The power and data composite cable 402 integrates a power line and a data line. Through the innovative "power supply + communication" integrated design, it can not only provide stable power for the fluorescent optical fiber sensor 3, but also transmit temperature monitoring data to the external data display system in real time. Wedge blocks 405 are respectively slidably connected to the left and right sides of the mounting bracket 403. The wedge blocks 405 clamp the control box 401, and the inner side surface of the wedge block 405 is inclined and is in contact and cooperation with the control box 401. A wear-resistant layer is provided on the inner side surface of the wedge block 405 to reduce the mechanical wear between the wedge block 405 and the control box 401. A spring 407 is connected between the wedge block 405 and the mounting bracket 403 to provide a reset force for the wedge block 405. A connector 406 is connected to the top of the wedge block 405. The power and data composite cable 402 and the connection cable 303 penetrate through the corresponding connector 406. The connector 406 plays a role in guiding, stress relief, and anti-vibration, improving the connection reliability of the system. The housing of the control box 401 is made of cast aluminum, which can withstand common mechanical vibrations and collisions in the industrial environment (such as the high-frequency vibrations during the operation of the fan), and protects the internal electronic components (such as circuit boards and optical fiber interfaces) from external force damage.

[0027] As Figures 2-6As shown in the figure, the fluorescence optical fiber sensor 3 includes a temperature measurement group 301, a probe 302, a connection cable 303, and a multi - probe group 304. The bottom of the fluorescence optical fiber sensor 3 is connected to the probe 302. The probe 302 penetrates through the inside of the motor group 2, and its tip is aligned with the bearing 204. By directly collecting the fluorescence signal on the surface of the bearing 204, it can accurately and real - time feedback the operating temperature of the bearing 204, effectively monitoring the abnormal temperature rise caused by factors such as poor lubrication and over - tight assembly. The left side of the fluorescence optical fiber sensor 3 is connected to the temperature measurement group 301. The temperature measurement group 301 has a total of three temperature measurement heads, all of which penetrate through the inside of the fan group 101 and are located near the impeller 102 and in the air flow path, which can monitor the gas temperature and the heat generation condition of mechanical components in real - time, preventing problems such as deformation and performance degradation of the impeller 102 caused by excessive temperature. The right side of the fluorescence optical fiber sensor 3 is connected to the multi - probe group 304. The multi - probe group 304 includes two arc - shaped optical fiber line probes and a straight probe. The straight probe is embedded in the winding slot of the stator 201 and is in direct contact with the winding coil to achieve precise monitoring of the temperature in the coil - dense area; the optical fiber lines of the arc - shaped optical fiber line probes are closely attached to the front and rear arc surfaces of the left end face of the stator 201, and the probe parts are also embedded in the winding slot of the stator 201. Through this three - dimensional layout, it realizes the all - round monitoring of the temperature field of the stator 201, overcoming the limitations of a single measurement point. The top of the fluorescence optical fiber sensor 3 is connected to the connection cable 303, which is used to connect to an external data display system. It can not only aggregate and transmit the fluorescence signals collected by each probe, but also receive the power transmitted by the system to ensure the stable operation of the sensor. Each probe of the fluorescence optical fiber sensor 3 is made of high - temperature - resistant ceramic material, which can withstand a temperature of over 600 °C (far exceeding the normal operating temperature of parts such as the bearing 204 and the stator 201), avoiding the temperature measurement deviation caused by high - temperature oxidation, deformation, or excessive thermal conductivity of traditional metal probes, and is provided with a fluorescence material coating. The coating is composed of rare - earth - doped aluminate fluorescent powder and high - temperature - resistant epoxy resin, which can keep the fluorescence characteristics stable and avoid signal attenuation caused by the decomposition of organic fluorescent materials at high temperatures.

[0028] When the device is working, after the stator 201 in the motor set 2 is energized, a rotating magnetic field is generated. This magnetic field realizes energy coupling through the air gap and drives the rotor 202 to rotate. The rotor 202 transmits power to the impeller 102 of the fan set 101 through the rotating shaft 203 (connected via a coupling), prompting the impeller 102 to rotate at a high speed, thus completing the functions of gas compression or transportation. During this process, the bearing 204 plays an important role in supporting the rotation of the rotating shaft 203 and bearing radial and axial loads. The probe 302 of the fluorescent optical fiber sensor 3 can monitor in real time the temperature rise data generated by the bearing 204 due to reasons such as friction and insufficient lubrication. The temperature measurement group 301 monitors the air flow temperature and the heat generation of mechanical components during the operation of the impeller 102 in the fan set 101. The multi-position probe group 304 monitors in real time the temperature of the stator 201 winding slot (coil concentrated area) and the arc surface of the left end face to prevent insulation aging or faults caused by overheating of the winding. The fluorescent optical fiber sensor 3 works based on the temperature sensitivity characteristics of the fluorescent material. The connection cable 303 has both data transmission and power supply functions. The power supply provided by the external system drives the light source to emit excitation light. The excitation light is transmitted through the optical fiber to each probe and irradiates the fluorescent material at the measured part. The fluorescent material emits a fluorescent signal after being excited. This signal is collected through the optical fiber and transmitted back to the data display system. The system calculates the real-time temperature of the measured part by accurately measuring the fluorescence lifetime or intensity decay characteristics and combining with the pre-calibrated temperature-fluorescence characteristic curve, realizing high-precision and real-time monitoring of the temperatures of key parts such as the bearing 204, the interior of the fan set 101, and the stator 201. The detected temperature data is transmitted through the connection cable 303 to the signal processing module of the external data display system to complete the final processing and display of the temperature data.

[0029] In terms of device maintenance, each component adopts a detachable design. The base 1 is connected to the fan set 101 and the motor set 2 through standardized bolts. Only conventional tools are needed to quickly separate them during disassembly; the couplings between the impeller 102 and the rotating shaft 203, and between the rotating shaft 203 and the rotor 202 also adopt detachable structures, facilitating the individual maintenance or replacement of the impeller 102 and the rotating shaft 203; the temperature measurement group 301, the probe 302, the multi-position probe group 304 of the fluorescent optical fiber sensor 3 and the connection cable 303 adopt plug-and-play interfaces. When a certain component fails, it can be directly disassembled and replaced without replacing the entire sensor, greatly reducing the maintenance cost and time cost.

[0030] During the operation of the equipment, the temperature measurement data of the motor set 2 and the fan set 101 collected by the fluorescent fiber optic sensor 3 is transmitted to the control box 401 via the connection cable 303, and then uploaded to the data display system through the power and data composite cable 402. At the same time, the power supply of the external system supplies power to the fluorescent fiber optic sensor 3 via the power and data composite cable 402 and the control box 401, forming a complete data transmission and power supply loop. During the equipment maintenance process, when components need to be disassembled, the operator can first disconnect the plug-in connections between the power and data composite cable 402 and the control box 401, and between the connection cable 303 and the control box 401, and then disassemble the control box 401. Specifically, when operating, horizontally pull the wedge block 405 to both sides. The wedge block 405 drives the connector 406 to move outward, and the spring 407 is compressed accordingly. The wedge block 405 disengages from the clamping state of the control box 401. At this time, the control box 401 can be vertically pulled out upward along the clamping rod 404. After the disassembly of the control box 401 is completed, release the wedge block 405. Under the elastic restoring force of the spring 407, the wedge block 405 automatically resets to the initial position. When reinstalling the control box 401, accurately align the control box 401 with the clamping rod 404 and push it vertically downward along the clamping rod 404. During the downward movement of the control box 401, its outer side contacts the inclined surface of the wedge block 405, pushing the wedge block 405 to slide to both sides and compressing the spring 407. When the control box 401 passes the key position of the inclined surface of the wedge block 405, the spring 407 releases its elastic potential energy, driving the wedge block 405 to quickly move inward and reset, realizing the automatic clamping and fixing of the control box 401. Subsequently, only the plug-in connection between the connection cable 303 and the power and data composite cable 402 needs to be completed to restore the normal operation of the equipment.

[0031] As Figures 8-9 shown, it further includes a support rod 501, a rack 502, and a gear 503. Support rods 501 are respectively welded at the front and rear middle positions on the top of the mounting frame 403. A rack 502 is slidably connected to the support rods 501. A gear 503 is installed on the middle part of the mounting frame 403 through a shaft seat. The tooth surfaces of the two racks 502 are arranged opposite to each other and jointly form a meshing transmission relationship with the gear 503.

[0032] When the device enters the maintenance process and the control box 401 needs to be disassembled, the operator only needs to pull the wedge block 405 on either side and move it outward. Its movement will directly drive the connected rack 502 to slide synchronously along the support rod 501. Based on the meshing transmission principle of the gear 503 and the rack 502, the linear motion of one side of the rack 502 is converted into rotational motion by the gear 503, and then drives the rack 502 on the other side to move in the opposite direction, realizing the synchronous reverse movement of the wedge blocks 405 on both sides. This linkage mechanism greatly reduces the operation steps, enables the wedge blocks 405 on both sides to quickly move away from each other, and immediately releases the clamping constraint on the control box 401. At this time, the control box 401 can be easily pulled out vertically along the clamping rod 404. After the maintenance operation is completed, release the wedge block 405. Under the action of the elastic restoring force of the spring 407, the wedge block 405 drives the rack 502 to move inward and reset. Through the meshing transmission of the gear 503 and the rack 502, it is ensured that the wedge block 405 on the other side synchronously completes the reset action, making the entire transmission system return to the initial state.

[0033] As Figures 8-9 shown, it also includes a nut 6. Threaded grooves are machined at the installation positions of each clamping rod 404 corresponding to the control box 401. The nut 6 is installed on the clamping rod 404 through the threaded grooves. When the control box 401 is accurately inserted in place along the clamping rod 404, the nut 6 can be screwed onto the clamping rod 404. The end of the nut 6 is in close contact with the control box 401, and an additional mechanical constraint is formed by applying a pre-tightening force, effectively preventing the control box 401 from generating displacement or loosening due to factors such as vibration and external force impact during the operation of the device, and significantly improving the stability and operation safety of the overall structure of the device.

[0034] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, those skilled in the art should understand that various changes in form and detail can be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above embodiments, but should be determined not only by the appended claims but also by the equivalents of the appended claims.

Claims

1. A temperature measurement device for a fan based on a fluorescent optical fiber, comprising a fan body and a fluorescent optical fiber sensor (3), wherein the fluorescent optical fiber sensor (3) is installed inside the fan body, and is characterized in that, It also includes a control box (401), a power data composite cable (402), a mounting bracket (403), a clamping rod (404), a wedge block (405), a connector (406) and a spring (407). A mounting bracket (403) is installed on the top of the fan body. Four clamping rods (404) are connected to the middle of the mounting bracket (403) along a square distribution. The control box (401) is installed between the four clamping rods (404) by a clamping method. The control box (401) is provided with a special plug-in interface and is electrically connected to the fluorescence optical fiber sensor (3) in a plug-and-play manner. The right end of the control box (401) is also connected to the power data composite cable (402) by a plug-in interface. Wedge blocks (405) are slidably connected to both sides of the mounting bracket (403). The wedge blocks (405) clamp the control box (401), and the inner side surface of the wedge block (405) is beveled and is in contact and cooperation with the control box (401). A spring (407) is connected between the wedge block (405) and the mounting bracket (403). A connector (406) is connected to the top of the wedge block (405). The power data composite cable (402) and the fluorescence optical fiber sensor (3) penetrate through the corresponding connectors (406).

2. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 1, characterized in that, The fluorescence optical fiber sensor (3) includes a temperature measurement group (301), a probe (302), a connection cable (303) and a multi-bit probe group (304). A probe (302) is connected to the bottom of the fluorescence optical fiber sensor (3). The probe (302) penetrates through the inside of the motor group (2), and the tip is aligned with the bearing (204). A temperature measurement group (301) is connected to the left side of the fluorescence optical fiber sensor (3). The temperature measurement group (301) has a total of three temperature measurement heads, all of which penetrate through the inside of the fan body for temperature measurement. A multi-bit probe group (304) is connected to the right side of the fluorescence optical fiber sensor (3). The multi-bit probe group (304) includes two arc-shaped optical fiber line probes and a straight probe. The arc-shaped optical fiber line probes and the straight probe are both embedded in the inside of the fan body. A connection cable (303) is connected to the top of the fluorescence optical fiber sensor (3).

3. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 2, characterized in that, Each probe of the fluorescence optical fiber sensor (3) is made of a high-temperature resistant ceramic material and is provided with a fluorescence material coating. The coating is composed of a rare-earth doped aluminate fluorescent powder and a high-temperature resistant epoxy resin mixed together.

4. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 1, characterized in that, The outer shell of the control box (401) is made of cast aluminum material.

5. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 1, characterized in that, A wear-resistant layer is provided on the inner side surface of the wedge block (405).

6. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 1, characterized in that, It also includes a support rod (501), a rack (502) and a gear (503). Support rods (501) are respectively connected to the middle position at the top of the mounting bracket (403). A rack (502) is slidably connected to the support rods (501). A gear (503) is installed in the middle of the mounting bracket (403) through a shaft seat. The tooth surfaces of the two racks (502) are arranged opposite to each other and jointly form a meshing transmission relationship with the gear (503).

7. The temperature measuring device for a fan based on a fluorescent optical fiber according to claim 1, characterized in that It also includes nuts (6). Thread grooves are processed at the positions corresponding to the installation positions of the control box (401) on each clamping rod (404). The nuts (6) are installed on the clamping rods (404) through the thread grooves.

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