A radial force measuring device and measuring method for a Roots blower

Abstract

The present invention belongs to the technical field of radial force measurement, in particular to a radial force measurement device and method for a Roots blower. Aiming at the problem that the existing radial force can only be measured at a fixed position and the installation and disassembly of sensors are very cumbersome, the following scheme is now proposed, including a bottom plate. One side of the bottom plate is fixed with a vertical plate. One side of the vertical plate away from the bottom plate is fixedly installed with a motor through bolts. One end of the driving shaft of the motor penetrates through the vertical plate. One side of the top of the bottom plate is fixed with a mounting plate. The same reciprocating lead screw is rotatably connected between the mounting plate and the side of the vertical plate close to each other. In the present invention, by injecting high-pressure gas into the hollow ring, the tension and compression sensor, the hollow ring and the driving shaft can be easily fixed. And when measuring the radial force, multiple tension and compression sensors can measure on different lengths of the driving shaft and different circumferential walls of the driving shaft, and accurate measurement data can be obtained.

Description

Technical Field

[0001] The invention relates to the technical field of radial force measurement, and in particular to a radial force measuring device and a measuring method for a Roots blower. Background Art

[0002] In Roots blower machinery, due to the dynamic imbalance of the blower blades themselves and the coupling effect between the blower blades and the air medium during rotation, the forces on the blades during operation are extremely complex, which can easily cause vibration and noise. In severe cases, it may even reduce the operating stability of the blower. Therefore, it is necessary to measure the radial force of the Roots blower during its production process.

[0003] The existing technology still has the following deficiencies in the radial force measurement process:

[0004] 1. When measuring the radial force of the shaft of the Roots blower motor, the radial force can only be measured at a fixed position, and the measurement is not accurate enough;

[0005] 2. When measuring, adjacent sensors need to be installed on the fan shaft. The installation and disassembly in the prior art is very cumbersome and can easily damage the shaft, affecting the integrity of the fan.

[0006] In view of the above problems, the present invention document proposes a radial force measuring device and a measuring method for a Roots blower. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings that the existing radial force can only be measured at a fixed position and the installation and disassembly of the sensor are very cumbersome, and to propose a radial force measuring device and a measuring method for a Roots blower.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A radial force measuring device for a Roots blower comprises a bottom plate, a vertical plate is fixed to one side of the bottom plate, a motor is fixedly installed on the side of the vertical plate away from the bottom plate by bolts, one end of the driving shaft of the motor passes through the vertical plate, a mounting plate is fixed to the top side of the bottom plate, a side of the mounting plate and the vertical plate close to each other is rotatably connected to the same reciprocating screw, and a movable frame slidably connected to the top of the bottom plate is provided on the outer wall thread sleeve of the reciprocating screw;

[0010] It also includes a plurality of tension and pressure sensors, and the plurality of tension and pressure sensors are located on the outer wall of the driving shaft, and are used to measure the radial force when the driving shaft rotates;

[0011] It also includes a disc, which is arranged above the reciprocating screw, and the outer wall of the disc is provided with a plurality of grooves, and a mounting disc is provided at one end of the drive shaft away from the motor, and a hexagonal screw threadedly connected to the drive shaft passes through the mounting disc, and the hexagonal screw is used to fix the mounting disc to the drive shaft, and a plurality of pins are fixed on one side of the mounting disc away from the drive shaft, and the plurality of pins are located on a side deviated from the center of the circle, and the plurality of pins are symmetrically arranged;

[0012] A clamping structure, disposed in the mobile frame, for mounting a plurality of tension and pressure sensors on an outer wall of the drive shaft;

[0013] The driving structure is arranged on the top of the mounting plate and is used to drive the reciprocating screw to rotate through the driving shaft so that the tension and pressure sensor can measure the radial force at different length positions of the driving shaft;

[0014] The adjustment structure is arranged in the movable frame and is used for adjusting the positions of the plurality of tension and pressure sensors distributed on the outer wall of the driving shaft.

[0015] In a possible design, the clamping structure includes a rotating ring rotating in a movable frame, the rotating ring internal thread penetrates a plurality of screw rods, the ends of the plurality of screw rods close to each other are rotatably connected to a fixed plate, the sides of the plurality of fixed plates away from each other are fixed with a plurality of telescopic rods, the ends of the telescopic rods away from the fixed plate are fixedly connected to the inner wall of the rotating ring, and the telescopic rods are composed of round rods with different inner diameters, and the plurality of round rods slide with each other to enable the fixed plate to move smoothly, the sides of the plurality of fixed plates close to each other are fixed with tension and pressure sensors by bolts, the sides of the plurality of tension and pressure sensors close to each other are rotatably connected to baffles, the sides of the plurality of baffles close to each other are fixed with screw rods, the outer wall of the driving shaft is sleeved with a hollow ring, the outer wall of the hollow ring is rotatably sleeved with a round sleeve, the outer wall of the round sleeve is provided with a plurality of threaded holes, and the threaded holes cooperate with the screw rods to fix the tension and pressure sensor to the round sleeve, and radial force is performed by distributing the plurality of tension and pressure sensors around the driving shaft. The outer walls of the plurality of screw rods are slidably connected with bevel gears through sliding grooves and sliders, and the bevel gears rotate on the outer wall of the rotating ring. The outer wall of the rotating ring is provided with a bevel gear ring meshing with the bevel gear. The rotation of the bevel gear ring is used to synchronously drive the plurality of screw rods to rotate, so that the plurality of screw rods move the same distance. High-pressure gas is injected into the hollow ring through the gas injection nozzle, and the sliding rod moves in the direction of the driving shaft under the action of the high-pressure gas. The hollow ring and the driving shaft are fixed by the pressure block, and the bevel gear ring is rotated. The bevel gear ring drives the screw rod to rotate through the bevel gear. The screw rod drives the fixing plate, the tension and pressure sensor and the screw rod to move toward the middle until the screw rod is screwed into the threaded hole, and the bevel gear ring drives the plurality of screw rods to rotate at the same time. Therefore, the distances moved by the plurality of screw rods are the same, and then the initial data of the plurality of tension and pressure sensors are the same, which is convenient for the later data collection and analysis. During the measurement, the motor drives the driving shaft to rotate, and the driving shaft drives the hollow ring to rotate, and then the plurality of tension and pressure sensors on the outer wall of the circular sleeve can measure the change of radial force when the driving shaft rotates.

[0016] In a possible design, the clamping structure also includes a gas injection nozzle arranged on one side of the hollow ring, which is used to inject high-pressure gas into the hollow ring. The outer wall of the drive shaft is provided with multiple sliding rods, and the ends of the multiple sliding rods that are away from each other are sealed and slidably extended into the hollow ring. The high-pressure gas in the hollow ring is used to drive the multiple sliding rods to move toward the middle, and the ends of the multiple sliding rods that are close to each other are fixed with pressure blocks for clamping the outer wall of the drive shaft; high-pressure gas is injected into the hollow ring through the gas injection nozzle, and the sliding rod moves toward the direction of the drive shaft under the action of the high-pressure gas, and the hollow ring and the drive shaft are fixed by the pressure blocks, so that the hollow ring can be easily installed on the outer wall of the drive shaft.

[0017] In a possible design, the driving structure includes a moving seat slidably arranged on the top of the mounting plate, the top of the moving seat is penetrated by a transmission shaft through the rotation of the fixed seat, one end of the transmission shaft is fixedly connected to one side of the disc, a rectangular groove is provided in the moving seat, a mounting seat is slidably connected in the rectangular groove, the bottom end of the mounting seat extends to the bottom of the moving seat and is fixedly connected to one side of the mounting plate, one side of the mounting seat is rotatably connected to a first synchronous wheel located above the moving seat, the end of the transmission shaft away from the disc slides through the first synchronous wheel through a slide groove and a slider, a gearbox is fixed to the side of the mounting plate close to the vertical plate, a second synchronous wheel is fixed to the input shaft of the gearbox, the second synchronous wheel is connected to the first synchronous wheel through a synchronous belt transmission, and the reciprocating screw is away from the vertical plate One end is fixedly connected with the output shaft of the gearbox for controlling the rotation speed of the reciprocating screw. A first threaded rod is connected to a bottom side of the movable seat through a base thread, and one end of the first threaded rod is rotatably connected to a side of the mounting plate away from the movable frame. The rotation of the first threaded rod is used to control the movement of the movable seat; the driving shaft drives the pin rod to rotate through the mounting plate, and the cooperation of the pin rod and the groove can intermittently drive the disc to rotate. The disc drives the reciprocating screw to rotate through the cooperation of the first synchronous wheel, the second synchronous wheel, the synchronous belt and the gearbox. The gearbox can adjust the rotation speed of the reciprocating screw. Therefore, when the driving shaft rotates to measure the radial force, the movable frame can be slowly driven to move, and the infrared ranging sensor measures the distance moved by the movable frame, so that the tension and pressure sensor detects the change of its radial force at different lengths of the driving shaft.

[0018] In a possible design, the adjustment structure includes a rotating shaft that passes through the movable frame, a first gear is fixed to the end of the rotating shaft away from the vertical plate, a straight tooth ring meshing with the first gear is fixedly sleeved on the outer wall of the rotating ring, a one-way bearing is sleeved on the outer wall of the rotating shaft, and the inner ring of the one-way bearing is fixedly connected to the outer wall of the rotating shaft, a second gear is fixed to the outer ring of the one-way bearing, a rack meshing with the second gear is slidably connected to the side of the vertical plate close to the movable frame, and the rack is located below the second gear, a plurality of tension springs are fixed to the bottom of the rack, and the plurality of tension springs are fixed to the top of the bottom plate, a stopper is fixed to the side of the rack close to the movable frame, and the movable frame close to the gear One side of the rack is rotatably connected with a connecting rod, and the connecting rod cooperates with the block and the rack to drive the rack to move up; the moving frame moves toward the vertical plate direction, the second gear moves above the rack, and then the moving frame continues to move, and the connecting rod fits one side of the rack. Since the connecting rod is tilted under the action of the limit block, when the moving frame drives the connecting rod to move, the rack is driven to move up through the connecting rod against the bottom of the block. The rack moves up and cooperates with the second gear to drive the one-way bearing to rotate. The one-way bearing and the rotating shaft are in a locked state, and the rotating shaft drives the first gear to rotate, and the first gear drives the rotating ring to rotate through the spur gear ring. The position of the pull and pressure sensor can be replaced, and further measurement of different axial positions of the outer wall of the driving shaft can be performed.

[0019] In a possible design, a limit block is fixed on one side of the movable frame, and the limit block is located at the bottom of the connecting rod, which is used to limit the connecting rod. The outer wall of the rotating shaft is provided with a damping bearing, and the damping bearing is fixed in the movable frame, which is used to limit the rotation of the rotating shaft. The connecting rod is placed at an angle under the action of the limit block, so that the top end of the connecting rod can cooperate with the rack and the stop block and drive the rack to move upward. The cooperation between the damping bearing and the rotating shaft can prevent the rotating ring from rotating.

[0020] In a possible design, a plurality of rubber wheels are rotatably connected to one side of the pressure block close to the driving shaft, so that the pressure block can move axially along the driving shaft; the provision of the rubber wheels can increase the friction between the pressure block and the driving shaft, so that the driving shaft drives the hollow ring to rotate, and can also facilitate the movement of the movable frame on the axis of the driving shaft.

[0021] In a possible design, an infrared distance measuring sensor is fixed to a side of the mounting plate close to the movable frame, for measuring the distance moved by the movable frame.

[0022] In a possible design, a fixed base plate is fixed to the bottom of the rotating ring, a second threaded rod is penetrated by the internal thread of the fixed base plate, and a rubber gasket is rotatably connected to one end of the second threaded rod close to the bevel gear ring, and the rubber gasket is used to brake the bevel gear ring; the rubber gasket is driven by the second threaded rod to squeeze the bevel gear ring, which is used to brake the bevel gear ring and prevent the bevel gear ring from shaking.

[0023] In the present application, a method for measuring a radial force measuring device of a Roots blower comprises the following steps:

[0024] S1. Installation process: The motor is fixed to the vertical plate by bolts, and the drive shaft penetrates the hollow ring; high-pressure gas is injected into the hollow ring, and the pressure is monitored by the air pressure sensor. The sliding rod is pressed and pushes the fixed drive shaft through the pressure block; then, the hexagonal screw fixes the mounting plate; the bevel gear ring drives the screw rod through the bevel gear, driving the fixed plate, the tension pressure sensor and the screw rod to move synchronously to the threaded hole and tighten them; finally, the second threaded rod is turned to brake the disc with a rubber gasket to prevent the bevel gear ring from loosening;

[0025] S2, measurement steps: the motor drives the drive shaft and the hollow ring to rotate, and the tension and pressure sensors on the round sleeve record the radial force changes; the drive shaft drives the pin rod to intermittently rotate the disc through the mounting plate, and the disc drives the reciprocating screw synchronously, and the gearbox adjusts the speed, so that the moving frame moves slowly with the rotation of the drive shaft, and the infrared ranging sensor records the moving distance, so as to realize the measurement of radial force at different positions;

[0026] S3. In addition, the distance between the moving seat and the disc can be controlled by rotating the first threaded rod, so as to adapt to the measurement of drive shafts of different lengths;

[0027] S4. Adjustment of sensor position: When the moving frame approaches the vertical plate, the second gear contacts the rack; when the moving frame continues to move, the connecting rod is restricted by the position block and tilts to push the block, driving the rack upward, and the first gear and the spur gear ring are driven through the locked state of the one-way bearing and the rotating shaft to rotate the rotating ring, and the position of the tension and pressure sensor is changed to perform more axial position measurements; when the moving frame moves in the opposite direction, the rack is reset under the action of the tension spring, and the one-way bearing becomes active.

[0028] Beneficial effect: In the present invention, a first gear is fixed to one end of the rotating shaft, a spur gear ring meshing with the first gear is provided on the outer wall fixed sleeve of the rotating ring, a second gear is fixed to the outer wall sleeve of the rotating shaft through a one-way bearing, a rack is slidably connected to one side of the vertical plate, a stopper is fixed to the side of the rack close to the moving frame, and a connecting rod is rotatably connected to one side of the moving frame; when the moving frame moves, the connecting rod cooperates with the rack and the stopper to drive the rack to move upward, and the second gear of the rack cooperates to drive the rotating ring to rotate, so that the position of the tension and pressure sensor can be replaced, and different axial positions of the outer wall of the driving shaft can be further measured, so that accurate measurement data can be obtained;

[0029] In the present invention, a transmission shaft is rotatably passed through the top of the movable seat through the fixed seat, one end of the transmission shaft is fixedly connected to one side of the disc, a mounting seat fixedly connected to the mounting plate is slidably connected in the rectangular groove, one side of the mounting seat is rotatably connected to a first synchronous wheel slidably connected to the transmission shaft, a second synchronous wheel is fixed to the input shaft of the gearbox, the second synchronous wheel is connected to the first synchronous wheel through a synchronous belt transmission connection, and the end of the reciprocating screw away from the vertical plate is fixedly connected to the output shaft of the gearbox; the mounting plate intermittently drives the disc and the reciprocating screw to rotate through the pin rod and the groove, so as to slowly drive the movable frame to move, the infrared ranging sensor measures the distance moved by the movable frame, and the tension and pressure sensor detects the change of its radial force at positions of different lengths of the driving shaft;

[0030] In the present invention, the clamping structure also includes an injection nozzle arranged on one side of the hollow ring, a plurality of sliding rods are arranged on the outer wall of the driving shaft, and the ends of the plurality of sliding rods that are away from each other are sealed and slidably extended into the hollow ring, and an injection nozzle is arranged on one side of the hollow ring, and the ends of the plurality of sliding rods that are close to each other are fixed with pressure blocks; high-pressure gas is injected into the hollow ring through the injection nozzle, and the sliding rod moves in the direction of the driving shaft under the action of the high-pressure gas, and the fixation of the hollow ring and the driving shaft is completed by the pressure block, so the hollow ring can be easily installed on the outer wall of the driving shaft.

[0031] In the present invention, a plurality of screw rods are penetrated by the inner thread of the rotating ring, and the ends of the plurality of screw rods close to each other are rotatably connected to a fixed plate, and the sides of the plurality of fixed plates close to each other are fixed with tension and pressure sensors, and the sides of the plurality of tension and pressure sensors close to each other are rotatably connected to a screw rod through a baffle, and the outer wall of the rotating ring is rotatably sleeved with a bevel gear ring meshing with the bevel gear; the bevel gear ring drives the screw rod to rotate through the bevel gear, and the plurality of screw rods move the same distance, and thus the initial data of the plurality of tension and pressure sensors are the same, which is convenient for subsequent data collection and analysis.

[0032] In the present invention, the tension and pressure sensors, the hollow ring and the driving shaft can be easily fixed by injecting high-pressure gas into the hollow ring. When measuring radial force, multiple tension and pressure sensors can be measured at different lengths of the driving shaft and on different circumferential walls of the driving shaft, so that accurate measurement data can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the three-dimensional structure of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0034] Figure 2 A schematic diagram of a three-dimensional cross-sectional structure of a moving frame and a rotating ring of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0035] Figure 3 A schematic diagram of a three-dimensional exploded structure of a moving frame, a rotating ring, a circular sleeve and a hollow ring of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0036] Figure 4 A schematic diagram of a three-dimensional exploded cross-sectional structure of a hollow ring, a round sleeve and a screw of a radial force measuring device of a Roots blower provided in Example 1 of the present invention;

[0037] Figure 5 A schematic diagram of a three-dimensional exploded structure of a rotating ring and a screw rod of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0038] Figure 6 A schematic diagram of a three-dimensional exploded structure of a lead screw, a tension and pressure sensor and a screw of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0039] Figure 7 A schematic diagram of a three-dimensional exploded structure of a mounting plate, a circular plate and a moving seat of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0040] Figure 8A schematic diagram of a three-dimensional exploded cross-sectional structure of a moving seat, a mounting seat and a gearbox of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0041] Fig. 9 A schematic diagram of the three-dimensional structure of a moving frame and a rack of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0042] Fig.10 A schematic diagram of the three-dimensional structure of the connecting rod and the rack matching a radial force measuring device of a Roots blower provided in Example 1 of the present invention;

[0043] Fig.11 A schematic cross-sectional structural diagram of a pressing block of a radial force measuring device for a Roots blower provided in Example 1 of the present invention;

[0044] Fig.12 This is a schematic cross-sectional structural diagram of a movable frame of a radial force measuring device for a Roots blower provided in Example 2 of the present invention.

[0045] In the figure: 1, bottom plate; 2, vertical plate; 3, motor; 4, drive shaft; 5, mounting plate; 6, mounting plate; 7, reciprocating screw; 8, moving frame; 9, hollow ring; 10, sliding rod; 11, pressure block; 12, air injection nozzle; 13, rubber wheel; 14, round sleeve; 15, threaded hole; 16, rotating ring; 17, screw rod; 18, fixed plate; 19, telescopic rod; 20, tension pressure sensor; 21, baffle; 22, screw rod; 23, bevel gear; 24, bevel gear ring; 25, moving seat; 26, transmission shaft; 27, round Disk; 28. groove; 29. ​​pin rod; 30. rectangular groove; 31. mounting seat; 32. first synchronous wheel; 33. gearbox; 34. second synchronous wheel; 35. infrared ranging sensor; 36. first threaded rod; 37. rubber gasket; 38. rotating shaft; 39. damping bearing; 40. first gear; 41. spur ring; 42. one-way bearing; 43. second gear; 44. rack; 45. tension spring; 46. block; 47. connecting rod; 48. limit block; 49. second threaded rod; 50. hexagonal screw. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] Example 1: Reference Figure 1, a measuring device, which is used in the field of radial force measurement, includes a base plate 1, a vertical plate 2 is fixed to one side of the base plate 1, and a motor 3 is fixedly installed on the side of the vertical plate 2 away from the base plate 1 by bolts. One end of the driving shaft 4 of the motor 3 passes through the vertical plate 2. A mounting plate 6 is fixed to one side of the top of the base plate 1, and the mounting plate 6 and the vertical plate 2 are rotatably connected to the same reciprocating screw 7 on the side close to each other. A moving frame 8 is threadedly sleeved on the outer wall of the reciprocating screw 7, and the moving frame 8 is slidably connected to the top of the base plate 1, so that the moving frame 8 can move along the length direction of the base plate 1.

[0048] Reference Figure 2 and Figure 4 A plurality of tension and pressure sensors 20 are provided on the outer wall of the driving shaft 4 to measure the radial force when the driving shaft 4 rotates. These tension and pressure sensors 20 are mounted on the driving shaft 4 through a specific clamping structure to ensure accurate measurement of the radial force.

[0049] Reference Figure 1 and Figure 7 In addition, the device further comprises a disc 27, which is arranged above the reciprocating screw 7, and a plurality of grooves 28 are arranged on the outer wall of the disc 27. A mounting disc 5 is arranged at one end of the drive shaft 4 away from the motor 3, and a hexagonal screw 50 threadedly connected to the drive shaft 4 is passed through the mounting disc 5, which is used to fix the mounting disc 5 to the drive shaft 4. A plurality of pins 29 are fixed to the side of the mounting disc 5 away from the drive shaft 4, and these pins 29 are located on the side deviating from the center of the circle, and the plurality of pins 29 are arranged symmetrically. These pins 29 can cooperate with the grooves 28 on the disc 27, and are used to maintain the stability of the mounting disc 5 and the drive shaft 4 during the measurement process.

[0050] Reference Figure 2-Figure 6 The clamping structure includes a rotating ring 16 rotating in the mobile frame 8, and the internal thread of the rotating ring 16 penetrates a plurality of screw rods 17. The ends of the plurality of screw rods 17 close to each other are rotatably connected to a fixed plate 18, and the fixed plate 18 is used to install a tension and pressure sensor 20. The sides of the plurality of fixed plates 18 away from each other are fixed with a plurality of telescopic rods 19, which are composed of round rods with different inner diameters, and the plurality of round rods slide with each other to ensure that the fixed plate 18 can remain stable when moving. The end of the telescopic rod 19 away from the fixed plate 18 is fixedly connected to the inner wall of the rotating ring 16.

[0051] Reference Figure 2-Figure 6 The side where the multiple fixing plates 18 are close to each other is fixed with a tension pressure sensor 20 by bolts, and the tension pressure sensor 20 is used to measure the radial force of the drive shaft 4. The side where the multiple tension pressure sensors 20 are close to each other is rotatably connected with a baffle 21, and the baffle 21 is used to prevent the tension pressure sensor 20 from being damaged by excessive force during the measurement process. The side where the multiple baffles 21 are close to each other is fixed with a screw 22.

[0052] Reference Figure 4 The outer wall of the driving shaft 4 is sleeved with a hollow ring 9, and the outer wall of the hollow ring 9 is rotatably sleeved with a round sleeve 14. The outer wall of the round sleeve 14 is provided with a plurality of threaded holes 15, which cooperate with the screw 22 to fix the tension and pressure sensors 20 to the round sleeve 14. The radial force is measured by distributing a plurality of tension and pressure sensors 20 around the driving shaft 4.

[0053] Reference Figure 5 and Figure 6 The outer walls of the plurality of screw rods 17 are slidably connected with bevel gears 23 through sliding grooves and sliders, and the bevel gears 23 rotate on the outer wall of the rotating ring 16. The outer wall of the rotating ring 16 is rotatably sleeved with a bevel gear ring 24 meshing with the bevel gear 23. By rotating the bevel gear ring 24, the plurality of screw rods 17 can be synchronously driven to rotate, so that the plurality of screw rods 17 move the same distance, thereby ensuring that the initial data of the plurality of tension and pressure sensors 20 are the same, which is convenient for later data collection and analysis.

[0054] Reference Figure 4 A gas injection nozzle 12 is provided on one side of the hollow ring 9 for injecting high-pressure gas into the hollow ring 9. A plurality of sliding rods 10 are provided on the outer wall of the drive shaft 4, and the ends of the plurality of sliding rods 10 that are away from each other are sealed and slidably extended into the hollow ring 9. The high-pressure gas in the hollow ring 9 can drive the plurality of sliding rods 10 to move toward the middle, and the ends of the sliding rods 10 that are close to each other are fixed with a pressing block 11 for clamping the outer wall of the drive shaft 4. High-pressure gas is injected into the hollow ring 9 through the gas injection nozzle 12, and the sliding rod 10 moves toward the direction of the drive shaft 4 under the action of the high-pressure gas, and the hollow ring 9 and the drive shaft 4 are fixed by the pressing block 11, so that the hollow ring 9 can be easily installed on the outer wall of the drive shaft 4.

[0055] When in use, firstly, high-pressure gas is injected into the hollow ring 9 through the gas injection nozzle 12, so that the sliding rod 10 and the pressure block 11 clamp the outer wall of the drive shaft 4. Then, the bevel gear ring 24 is rotated, and the multiple screws 17 are driven to rotate through the bevel gear 23, so that the multiple screws 17 drive the fixed plate 18, the tension and pressure sensor 20 and the screw 22 to move toward the middle until the screw 22 is screwed into the threaded hole 15 of the round sleeve 14. Then, the motor 3 is started to drive the drive shaft 4 to rotate. Since the tension and pressure sensor 20 is fixedly connected to the round sleeve 14, and the round sleeve 14 is sleeved on the outer wall of the drive shaft 4 and rotates with it, the tension and pressure sensor 20 can measure the radial force when the drive shaft 4 rotates. By adjusting the position of the movable frame 8 and the position of the tension and pressure sensor 20 on the outer wall of the drive shaft 4, the radial forces at different positions can be measured and analyzed.

[0056] Reference Figure 1 , Figure 7 and Figure 8, the driving structure is arranged at the top of the mounting plate 6, and is used to drive the reciprocating screw 7 to rotate through the driving shaft 4. The driving structure mainly includes a moving seat 25, a transmission shaft 26, a disc 27, a rectangular groove 30, a mounting seat 31, a first synchronous wheel 32, a gearbox 33, a second synchronous wheel 34, a reciprocating screw 7 and a first threaded rod 36. The moving seat 25 is slidably arranged on the top of the mounting plate 6, and can move along the length direction of the mounting plate 6. At the top of the moving seat 25, a transmission shaft 26 is rotated through the fixed seat, and one end of the transmission shaft 26 is fixedly connected to one side of the disc 27, so that the disc 27 can rotate with the rotation of the transmission shaft 26. Inside the moving seat 25, a rectangular groove 30 is provided, and a mounting seat 31 is slidably connected in the rectangular groove 30, and the bottom end of the mounting seat 31 extends to the bottom of the moving seat 25 and is fixedly connected to one side of the mounting plate 6. Such a design enables the moving seat 25 to slide stably on the mounting plate 6.

[0057] Reference Figure 7 and Figure 8 On one side of the mounting seat 31, a first synchronous wheel 32 located above the moving seat 25 is rotatably connected. The end of the transmission shaft 26 away from the disc 27 slides through the first synchronous wheel 32 through a slide groove and a slider, so that the transmission shaft 26 can drive the first synchronous wheel 32 to rotate. On the side of the mounting plate 6 close to the vertical plate 2, a gearbox 33 is fixed. The input shaft of the gearbox 33 is fixed with a second synchronous wheel 34. The second synchronous wheel 34 is connected to the first synchronous wheel 32 through a synchronous belt transmission, so that the first synchronous wheel 32 can drive the second synchronous wheel 34 to rotate, and then drive the reciprocating screw 7 to rotate through the gearbox 33.

[0058] Reference Figure 1 , Figure 7 and Figure 8 , on one side of the bottom of the mobile seat 25, a first threaded rod 36 is connected through the base thread, and one end of the first threaded rod 36 is rotatably connected to the side of the mounting plate 6 away from the mobile frame 8. By rotating the first threaded rod 36, the movement of the mobile seat 25 can be controlled, and the positions of the transmission shaft 26, the disc 27 and the first synchronous wheel 32 can be adjusted. The drive shaft 4 drives the pin 29 to rotate through the mounting plate 5. The pin 29 cooperates with the groove 28 on the disc 27 to intermittently drive the disc 27 to rotate. When the disc 27 rotates, the first synchronous wheel 32 is driven to rotate through the transmission shaft 26. The first synchronous wheel 32 drives the second synchronous wheel 34 to rotate through the synchronous belt. The second synchronous wheel 34 drives the reciprocating screw 7 to rotate through the gearbox 33. The gearbox 33 can adjust the speed of the reciprocating screw 7, so that the mobile frame 8 can move slowly when the drive shaft 4 rotates to measure the radial force. An infrared ranging sensor 35 is provided on the mobile frame 8 to measure the distance moved by the mobile frame 8, so that the tension and pressure sensor 20 detects the change of its radial force at different lengths of the drive shaft 4.

[0059] Reference Figure 1 , Fig. 9 and Fig.10 , the adjustment structure is arranged in the mobile frame 8, and is used to adjust the positions of the multiple tension and pressure sensors 20 distributed on the outer wall of the driving shaft 4. The adjustment structure mainly includes components such as a rotating shaft 38, a first gear 40, a spur gear ring 41, a one-way bearing 42, a second gear 43, a rack 44, a tension spring 45, a stopper 46 and a connecting rod 47. The rotating shaft 38 passes through the mobile frame 8, and the first gear 40 is fixed to the end thereof away from the vertical plate 2. On the outer wall of the rotating ring 16, a spur gear ring 41 meshing with the first gear 40 is fixedly sleeved, so that the first gear 40 can drive the rotating ring 16 to rotate. On the outer wall of the rotating shaft 38, a one-way bearing 42 is sleeved, the inner ring of the one-way bearing 42 is fixedly connected to the outer wall of the rotating shaft 38, and the outer ring of the one-way bearing 42 is fixed with a second gear 43. On the side of the vertical plate 2 close to the mobile frame 8, a rack 44 meshing with the second gear 43 is slidably connected, and the rack 44 is located below the second gear 43. A plurality of tension springs 45 are fixed to the bottom of the rack 44, and the plurality of tension springs 45 are fixed to the top of the bottom plate 1, and are used to reset the rack 44. A stopper 46 is fixed to the side of the rack 44 close to the moving frame 8, and a connecting rod 47 is rotatably connected to the side of the moving frame 8 close to the rack 44, and the connecting rod 47 cooperates with the stopper 46 and the rack 44 to drive the rack 44 to move upward.

[0060] Reference Fig. 9 and Fig.10 When the moving frame 8 moves toward the vertical plate 2, the second gear 43 moves to the top of the rack 44. Then the moving frame 8 continues to move, and the connecting rod 47 fits against one side of the rack 44. Since the connecting rod 47 is tilted under the action of the limit block 48, when the moving frame 8 drives the connecting rod 47 to move, the connecting rod 47 will contact the bottom of the block 46 and drive the rack 44 to move upward. After the rack 44 moves upward, it cooperates with the second gear 43 to drive the one-way bearing 42 to rotate. Since the one-way bearing 42 and the rotating shaft 38 are in a locked state, the one-way bearing 42 will drive the rotating shaft 38 to rotate when it rotates, and then drive the first gear 40 to rotate. The first gear 40 drives the rotating ring 16 to rotate through the spur gear ring 41, thereby changing the position of the tension and pressure sensor 20, and further measuring different axial positions of the outer wall of the drive shaft 4.

[0061] Reference Fig. 9 and Fig.10A limit block 48 is fixed on one side of the moving frame 8, and the limit block 48 is located at the bottom of the connecting rod 47, which is used to limit the connecting rod 47. A damping bearing 39 is sleeved on the outer wall of the rotating shaft 38, and the damping bearing 39 is fixed in the moving frame 8, which is used to limit the rotation of the rotating shaft 38. When the connecting rod 47 is tilted under the action of the limit block 48, the top of the connecting rod 47 can cooperate with the rack 44 and the stopper 46 to drive the rack 44 to move upward. The cooperation between the damping bearing 39 and the rotating shaft 38 can prevent the rotating ring 16 from rotating when there is no external force, thereby ensuring the accuracy of the measurement.

[0062] Reference Fig.11 The radial force measuring device of the Roots blower includes multiple components, among which the design of the pressure block 11 is particularly critical. The pressure block 11 is close to the side of the drive shaft 4, and multiple rubber wheels 13 are installed by a rotating connection. The setting of these rubber wheels 13 enables the pressure block 11 to move smoothly along the axial direction of the drive shaft 4. The rubber wheel 13 not only plays a guiding role, but also increases the friction between the pressure block 11 and the drive shaft 4. In this way, when the drive shaft 4 rotates, the hollow ring 9 can be driven to rotate together through friction. At the same time, the rolling characteristics of the rubber wheel 13 also facilitate the movement of the mobile frame 8 on the axis of the drive shaft 4, making the operation of the entire measuring device more flexible and smooth.

[0063] Reference Figure 8 Furthermore, in order to accurately measure the moving distance of the mobile frame 8, we fixed an infrared distance sensor 35 on the side of the mounting plate 6 close to the mobile frame 8. The infrared distance sensor 35 can monitor and record the moving distance of the mobile frame 8 in real time, providing accurate data support for the subsequent radial force calculation.

[0064] In this way, we have realized a Roots blower radial force measuring device with stable structure and flexible operation. The setting of the rubber wheel 13 not only ensures the effective transmission between the pressure block 11 and the drive shaft 4, but also facilitates the movement of the mobile frame 8; the introduction of the infrared distance sensor 35 improves the accuracy of the measurement; and the combination of the second threaded rod 49 and the rubber gasket 37 effectively fixes the bevel gear ring 24 to avoid its shaking during the measurement process. These designs together constitute the core advantages of the measuring device, making it perform well in practical applications.

[0065] The radial force measuring device of the Roots blower of the present invention can measure the radial force of the drive shaft 4 at different lengths and different axial positions, thereby improving the accuracy and reliability of the measurement.

[0066] Among them, the motor 3 is the motor of the Roots blower.

[0067] Example 2: Reference Fig.12, improved on the basis of Example 1: In addition, at the bottom of the rotating ring 16, we fixed a fixed base plate. In the fixed base plate, we threadedly penetrated a second threaded rod 49. This second threaded rod 49 is close to one end of the bevel gear ring 24 and is rotatably connected to a rubber gasket 37. When it is necessary to fix the position of the bevel gear ring 24 to prevent it from shaking, we can rotate the second threaded rod 49 to drive the rubber gasket 37 to move toward the bevel gear ring 24 and squeeze it. The elasticity and friction of the rubber gasket 37 can effectively fix the bevel gear ring 24 to ensure that it is stable and motionless.

[0068] A method for measuring a radial force measuring device of a Roots blower comprises the following steps:

[0069] S1. During installation, the motor 3 of the Roots blower is installed on one side of the vertical plate 2 by bolts, and one end of the drive shaft 4 passes through the hollow ring 9 during installation, and high-pressure gas is injected into the hollow ring 9 through the gas injection nozzle 12. The pressure in the hollow ring 9 is detected by the air pressure sensor in the hollow ring 9. The sliding rod 10 moves toward the direction of the drive shaft 4 under the action of the high-pressure gas, and the hollow ring 9 and the drive shaft 4 are fixed by the pressing block 11. Then, the mounting plate 5 is fixed to one end of the drive shaft 4 by the hexagonal screw 50, and then the bevel gear ring 24 is rotated. The bevel gear ring 24 drives the screw rod 17 to rotate through the bevel gear 23, and the screw rod 17 drives the fixing plate 18, the tension and pressure sensor 20 and the screw rod 22 to move toward the middle until the screw rod 22 is screwed into the threaded hole 15. The bevel gear ring 24 drives multiple screw rods 17 to rotate at the same time, so the multiple screw rods 17 move the same distance, and then the initial data of multiple tension and pressure sensors 20 are the same, which is convenient for later data collection and analysis. Finally, the second threaded rod 49 is rotated to brake the disc 27 through the rubber gasket 37 to prevent the bevel gear ring 24 from loosening in the later stage.

[0070] S2. During measurement, the motor 3 drives the driving shaft 4 to rotate, and the driving shaft 4 drives the hollow ring 9 to rotate, and then the multiple tension and pressure sensors 20 on the outer wall of the circular sleeve 14 can measure the change of radial force when the driving shaft 4 rotates. Then the driving shaft 4 drives the pin 29 to rotate through the mounting plate 5. The cooperation of the pin 29 and the groove 28 can intermittently drive the disc 27 to rotate. The disc 27 drives the reciprocating screw 7 to rotate through the cooperation of the first synchronous wheel 32, the second synchronous wheel 34, the synchronous belt and the gearbox 33. The gearbox 33 can adjust the speed of the reciprocating screw 7. Therefore, when the driving shaft 4 rotates to measure the radial force, the moving frame 8 can be slowly driven to move, and the infrared ranging sensor 35 measures the distance moved by the moving frame 8, so that the tension and pressure sensor 20 detects the change of its radial force at different lengths of the driving shaft 4;

[0071] S3. In addition, the distance between the moving seat 25 and the disc 27 can be controlled by rotating the first threaded rod 36, so as to adapt to the measurement of drive shafts 4 of different lengths;

[0072] S4, the movable frame 8 moves in the direction of the vertical plate 2, the second gear 43 moves to the top of the rack 44, and then the movable frame 8 continues to move, and the connecting rod 47 is fitted with one side of the rack 44. Since the connecting rod 47 is tilted under the action of the limit block 48, when the movable frame 8 drives the connecting rod 47 to move, the rack 44 is driven to move up through the bottom of the connecting rod 47 that resists the stop block 46. The rack 44 moves up and cooperates with the second gear 43 to drive the one-way bearing 42 to rotate. The one-way bearing 42 and the rotating shaft 38 are in a locked state. The rotating shaft 38 drives the first gear 40 to rotate. The first gear 40 drives the rotating ring 16 to rotate through the spur gear ring 41, and the position of the tension and pressure sensor 20 can be replaced, and the different axial positions of the outer wall of the driving shaft 4 are further measured. When the movable frame 8 moves in the opposite direction, the rack 44 is reset under the pulling force of the tension spring 45, and the rack 44 drives the second gear 43 to rotate in the opposite direction. At this time, the one-way bearing 42 and the rotating shaft 38 are in an active state.

[0073] However, as is well known to those skilled in the art, the working principles and wiring methods of the infrared ranging sensor 35 and the tension and pressure sensor 20 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A radial force measuring device for a Roots blower, characterized in that: It comprises a base plate (1), a vertical plate (2) is fixed on one side of the base plate (1), a motor (3) is fixedly mounted on the side of the vertical plate (2) away from the base plate (1) by means of bolts, one end of a driving shaft (4) of the motor (3) passes through the vertical plate (2), a mounting plate (6) is fixed on the top side of the base plate (1), a side of the mounting plate (6) and the vertical plate (2) close to each other is rotatably connected to a same reciprocating screw (7), and a threaded sleeve on the outer wall of the reciprocating screw (7) is provided with a movable frame (8) slidably connected to the top of the base plate (1); It also includes a plurality of tension and pressure sensors (20), and the plurality of tension and pressure sensors (20) are located on the outer wall of the drive shaft (4) and are used to measure the radial force when the drive shaft (4) rotates; It also comprises a disc (27), the disc (27) being arranged above the reciprocating screw (7), the outer wall of the disc (27) being provided with a plurality of grooves (28), a mounting disc (5) being provided at one end of the drive shaft (4) away from the motor (3), a hexagonal screw (50) being passed through the mounting disc (5) and being threadedly connected to the drive shaft (4), the hexagonal screw (50) being used to fix the mounting disc (5) to the drive shaft (4), a plurality of pins (29) being fixed to one side of the mounting disc (5) away from the drive shaft (4), the plurality of pins (29) being located on a side deviating from the center of the circle, and the plurality of pins (29) being arranged symmetrically; A clamping structure is arranged in a movable frame (8) and is used to mount a plurality of tension and pressure sensors (20) on the outer wall of a driving shaft (4); the clamping structure comprises a rotating ring (16) rotating in the movable frame (8), a plurality of screw rods (17) passing through the internal thread of the rotating ring (16), the ends of the plurality of screw rods (17) close to each other are rotatably connected to a fixed plate (18), the sides of the plurality of fixed plates (18) away from each other are fixed with a plurality of telescopic rods (19), the ends of the telescopic rods (19) away from the fixed plate (18) are fixedly connected to the inner wall of the rotating ring (16), and the telescopic rods (19) are composed of round rods with different inner diameters, and the plurality of round rods are slidably matched with each other, so as to enable the fixed plate (18) to move smoothly, the sides of the plurality of fixed plates (18) close to each other are fixed with tension and pressure sensors (20) by bolts, and the sides of the plurality of tension and pressure sensors (20) close to each other are rotatably connected to a baffle (21). , a screw (22) is fixed on one side of the plurality of baffles (21) close to each other, the outer wall of the drive shaft (4) is sleeved with a hollow ring (9), the outer wall of the hollow ring (9) is sleeved with a round sleeve (14), the outer wall of the round sleeve (14) is sleeved with a plurality of threaded holes (15), and the threaded holes (15) cooperate with the screw (22) to fix the tension and pressure sensors (20) to the round sleeve (14), and the radial force is measured by distributing the plurality of tension and pressure sensors (20) around the drive shaft (4), the outer walls of the plurality of screw rods (17) are slidably connected with bevel gears (23) through sliding grooves and sliders, and the bevel gears (23) rotate on the outer wall of the rotating ring (16), the outer wall of the rotating ring (16) is sleeved with a bevel gear ring (24) meshing with the bevel gear (23), and the rotation of the bevel gear ring (24) is used to synchronously drive the plurality of screw rods (17) to rotate, so that the plurality of screw rods (17) move the same distance; A driving structure, arranged on the top of the mounting plate (6), for driving the reciprocating screw (7) to rotate via the driving shaft (4), so that the tension and pressure sensor (20) measures radial force at positions of different lengths of the driving shaft (4); The adjustment structure is arranged in the movable frame (8) and is used to adjust the positions of the plurality of tension and pressure sensors (20) distributed on the outer wall of the driving shaft (4).

2. A radial force measuring device for a Roots blower according to claim 1, characterized in that: The clamping structure further comprises a gas injection nozzle (12) arranged on one side of the hollow ring (9) for injecting high-pressure gas into the hollow ring (9); a plurality of sliding rods (10) are arranged on the outer wall of the drive shaft (4); the ends of the plurality of sliding rods (10) that are away from each other are sealed and slidably extended into the hollow ring (9); the high-pressure gas in the hollow ring (9) is used to drive the plurality of sliding rods (10) to move toward the middle; the ends of the plurality of sliding rods (10) that are close to each other are fixed with a pressure block (11) for clamping the outer wall of the drive shaft (4).

3. A radial force measuring device for a Roots blower according to claim 2, characterized in that: The driving structure comprises a moving seat (25) slidably arranged on the top of the mounting plate (6); a transmission shaft (26) is rotatably passed through the top of the moving seat (25) via a fixed seat; one end of the transmission shaft (26) is fixedly connected to one side of the disc (27); a rectangular groove (30) is provided in the moving seat (25); a mounting seat (31) is slidably connected in the rectangular groove (30); the bottom end of the mounting seat (31) extends to the bottom of the moving seat (25) and is fixedly connected to one side of the mounting plate (6); one side of the mounting seat (31) is rotatably connected to a first synchronous wheel (32) located above the moving seat (25); an end of the transmission shaft (26) away from the disc (27) is slidably passed through the first synchronous wheel (32) via a sliding groove and a slider; A synchronous wheel (32), a gearbox (33) is fixed on one side of the mounting plate (6) close to the vertical plate (2), a second synchronous wheel (34) is fixed on the input shaft of the gearbox (33), the second synchronous wheel (34) is connected to the first synchronous wheel (32) through a synchronous belt transmission, one end of the reciprocating screw (7) away from the vertical plate (2) is fixedly connected to the output shaft of the gearbox (33) for controlling the rotation speed of the reciprocating screw (7), one side of the bottom of the movable seat (25) is connected to a first threaded rod (36) through a base thread, and one end of the first threaded rod (36) is rotatably connected to a side of the mounting plate (6) away from the movable frame (8), and the rotation of the first threaded rod (36) is used to control the movement of the movable seat (25).

4. A radial force measuring device for a Roots blower according to claim 3, characterized in that: The adjustment structure comprises a rotating shaft (38) penetrating the movable frame (8); a first gear (40) is fixed to one end of the rotating shaft (38) away from the vertical plate (2); a spur gear ring (41) meshing with the first gear (40) is fixedly sleeved on the outer wall of the rotating ring (16); a one-way bearing (42) is sleeved on the outer wall of the rotating shaft (38); an inner ring of the one-way bearing (42) is fixedly connected to the outer wall of the rotating shaft (38); a second gear (43) is fixed to the outer ring of the one-way bearing (42); and a side of the vertical plate (2) close to the movable frame (8) is provided with a fixed sleeve. A rack (44) meshing with the second gear (43) is slidably connected, and the rack (44) is located below the second gear (43). A plurality of tension springs (45) are fixed to the bottom of the rack (44), and the plurality of tension springs (45) are fixed to the top of the bottom plate (1). A stopper (46) is fixed to a side of the rack (44) close to the movable frame (8). A connecting rod (47) is rotatably connected to a side of the movable frame (8) close to the rack (44), and the connecting rod (47) cooperates with the stopper (46) and the rack (44) to drive the rack (44) to move upward.

5. The radial force measuring device of a Roots blower according to claim 4, characterized in that: A limit block (48) is fixed on one side of the movable frame (8), and the limit block (48) is located at the bottom of the connecting rod (47) and is used to limit the connecting rod (47). The outer wall of the rotating shaft (38) is sleeved with a damping bearing (39), and the damping bearing (39) is fixed in the movable frame (8) and is used to limit the rotation of the rotating shaft (38).

6. A radial force measuring device for a Roots blower according to claim 5, characterized in that: A side of the pressing block (11) close to the driving shaft (4) is rotatably connected to a plurality of rubber wheels (13) for enabling the pressing block (11) to move along the axial direction of the driving shaft (4).

7. A radial force measuring device for a Roots blower according to claim 6, characterized in that: An infrared distance measuring sensor (35) is fixed on one side of the mounting plate (6) close to the movable frame (8) for measuring the distance moved by the movable frame (8).

8. The radial force measuring device of a Roots blower according to claim 7, characterized in that: A fixed base plate is fixed to the bottom of the rotating ring (16), a second threaded rod (49) is penetrated through the internal thread of the fixed base plate, and a rubber gasket (37) is rotatably connected to one end of the second threaded rod (49) close to the bevel gear ring (24), and the rubber gasket (37) is used to brake the bevel gear ring (24).

9. A method for measuring a radial force measuring device of a Roots blower, using the radial force measuring device of a Roots blower according to claim 8, characterized in that: The following steps are involved: S1, installation process: the motor (3) is fixed to the vertical plate (2) by bolts, and the drive shaft (4) penetrates the hollow ring (9); high-pressure gas is injected into the hollow ring (9), and the pressure is monitored by the air pressure sensor. The sliding rod (10) is pressed through the pressure block (11) to push the fixed drive shaft (4); then, the hexagonal screw (50) fixes the mounting plate (5); the bevel gear ring (24) drives the screw rod (17) through the bevel gear (23), driving the fixed plate (18), the tension pressure sensor (20) and the screw rod (22) to move synchronously to the threaded hole (15) and tighten; finally, the second threaded rod (49) is rotated to brake the disc (27) with the rubber gasket (37) to prevent the bevel gear ring (24) from loosening; S2, measurement steps: the motor (3) drives the driving shaft (4) and the hollow ring (9) to rotate, and the tension and pressure sensor (20) on the circular sleeve (14) records the radial force change; the driving shaft (4) drives the pin rod (29) to intermittently rotate the disc (27) through the mounting plate (5), and the disc (27) drives the reciprocating screw (7) synchronously, and the gearbox (33) adjusts the speed, so that the moving frame (8) moves slowly with the rotation of the driving shaft (4), and the infrared distance sensor (35) records the moving distance, so as to realize the measurement of radial force at different positions; S3. In addition, the distance between the movable seat (25) and the disc (27) can be controlled by rotating the first threaded rod (36), thereby adapting to the measurement of drive shafts (4) of different lengths; S4, sensor position adjustment: when the moving frame (8) approaches the vertical plate (2), the second gear (43) contacts the rack (44); when the moving frame (8) continues to move, the connecting rod (47) is restricted by the block (48) to tilt and push the stopper (46), driving the rack (44) to move upward, and through the locked state of the one-way bearing (42) and the rotating shaft (38), the first gear (40) and the spur gear ring (41) are driven to rotate the rotating ring (16), and the position of the tension and pressure sensor (20) is changed to perform more axial position measurements; when the moving frame (8) moves in the reverse direction, the rack (44) is reset under the action of the tension spring (45), and the one-way bearing (42) is turned into an active state.

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