B737NG main landing gear outer cylinder inner circle chromium layer chamfer depth measuring tool

Abstract

The invention discloses a B737NG main landing gear outer cylinder inner circle chromium layer chamfer depth measuring tool, which comprises a mounting seat, a magnetic seat gauge, a connecting rod, a mounting disc, a driving mechanism and a plurality of groups of centering assemblies, and is characterized in that the mounting seat is rotatably mounted at the upper end of the connecting rod, and the lower end of the connecting rod is connected with the mounting disc; each centering assembly comprises a sliding plate, a mounting frame and a positioning roller rotationally mounted on the mounting frame, the sliding plates extend into the mounting cavity through sliding holes in the mounting disc, the outer ends of the sliding plates are connected with the mounting frames, and the inner ends of the sliding plates are connected with a driving mechanism so that the sliding plates of the centering assemblies can slide outwards or inwards at the same time. When the sliding plate slides outwards, the mounting frame pushes the positioning roller to abut against the inner wall of the barrel to achieve centering supporting, or when the sliding plate slides inwards, the mounting frame pulls the positioning roller to be separated from the inner wall of the barrel. The positioning roller abuts against the inner wall of the cylinder body, so that the mounting base and the magnetic base are centered and positioned in the B737NG main landing gear outer cylinder, auxiliary detection operation is facilitated, and centering detection quality is guaranteed.

Description

Technical Field

[0001] The invention belongs to a main landing gear outer cylinder measurement auxiliary technology, and in particular relates to a B737NG main landing gear outer cylinder inner circle chrome layer chamfer depth measurement tool. Background Art

[0002] like Figure 1 As shown, there are two corrosions on the chamfer of the chrome layer at the inner diameter 33 of the outer tube 1 of the B737NG main landing gear. According to the plan given by the design company, the corroded area needs to be polished and removed, acid etching inspection and penetration inspection need to be carried out, the depth of the polished area and other dimensions need to be measured, and the rotary vane shot peening, cadmium brushing, and primer spraying need to be carried out.

[0003] During the processing, the depth of the corrosion points in the chamfered area is different, and the depth after grinding and removal is also different. Because the outer cylinder of the B737NG main landing gear is fixed on the aircraft and cannot rotate, it is impossible to measure the depth with a micrometer. Summary of the invention

[0004] The purpose of the present invention is to provide a B737NG main landing gear outer tube inner circle chrome layer chamfer depth measuring tool which has a simple structure, low cost, easy operation and can assist detection operation to ensure the centering detection quality.

[0005] The objective of the present invention is achieved through the following technical measures: A tool for measuring the chamfer depth of the chrome layer on the inner circle of the outer cylinder of the main landing gear of B737NG, characterized in that it includes a mounting seat, a magnetic seat table arranged on the mounting seat, a connecting rod, a mounting disk with a mounting cavity, a driving mechanism arranged in the mounting cavity and a plurality of groups of centering components arranged along the side circumference of the mounting disk, the mounting seat can be rotatably mounted on the upper end of the connecting rod, the lower end of the connecting rod is connected to the mounting disk, each group of centering components includes a slide plate, a mounting frame and a positioning roller rotatably mounted on the mounting frame, the slide plate extends into the mounting cavity through a sliding hole on the side of the mounting disk and can slide along the sliding hole, the outer end of the slide plate is connected to the mounting frame, and the inner end is connected to the driving mechanism so that the slide plates of each group of centering components can slide outward or inward at the same time, so that when the slide plate slides outward, the positioning roller is pushed by the mounting frame to contact the inner wall of the cylinder to realize centering support, or when the slide plate slides inward, the positioning roller is pulled away from the inner wall of the cylinder by the mounting frame.

[0006] After the B737NG main landing gear outer cylinder is processed, when the processing effect of the chamfered area is tested, the present invention uses a positioning roller to abut against the inner wall of the cylinder body to center the mounting seat and the magnetic seat table inside the B737NG main landing gear outer cylinder, which is convenient for auxiliary detection operations and thus ensures the quality of centering detection.

[0007] The present invention provides a cleaning component on the mounting frame for cleaning the position of the positioning roller during the centering process. During the centering detection process, the cleaning component can clean the inner wall of the cylinder at the positioning position of the positioning roller to ensure the centering effect and further ensure the quality of the centering detection.

[0008] The cleaning assembly of the present invention includes an exhaust pipe, a loop-shaped pipe and an exhaust assembly for exhausting air from the inside of the loop-shaped pipe, which are arranged on a mounting frame. One end of the exhaust pipe faces the inner wall of the cylinder, and the other end is connected to the loop-shaped pipe. The exhaust assembly is connected to the loop-shaped pipe, and dust at the position where the positioning roller is positioned is sucked into the loop-shaped pipe through the exhaust pipe through the exhaust action of the exhaust assembly.

[0009] The mounting frame of the present invention is a "["-shaped plate, the positioning roller is fixed on the mounting shaft and the two ends of the mounting shaft are rotatably mounted on the top and bottom surfaces of the mounting frame, there are multiple exhaust pipes and they are located on both sides of the positioning roller, the ring-shaped pipe is located on the back of the mounting frame, and the exhaust assembly is located on the top surface of the mounting frame.

[0010] The vacuum assembly of the present invention includes a vertical mounting tube, a horizontal operating tube, a pair of one-way valves, a horizontal push rod, a piston plate and a rotating disk with a plurality of protrusions on the side circumference. The rotating disk is mounted on the upper end of the mounting shaft, and the lower end of the mounting tube is connected to the ring tube. The pair of one-way valves are mounted in the mounting tube, one end of the operating tube is connected to the mounting tube and the connecting part is between the pair of one-way valves, the push rod penetrates into the other end of the operating tube and is connected to a piston plate that can slide in the operating tube, the outer end of the push rod cooperates with the protrusion on the rotating disk so that the push rod can be squeezed and pushed by the protrusion when the rotating disk rotates, and a first spring is sleeved on the push rod, and the first spring is located between the piston plate and the end of the operating tube.

[0011] The driving mechanism of the present invention includes a spline cylinder, a spline shaft, a threaded sleeve, a threaded rod, a driving pin, a driving disk and multiple groups of transmission components. The spline cylinder can be rotatably installed at the center position of the top plate of the mounting disk, the driving disk is fixed on the spline cylinder, the spline shaft is slidably installed on the spline cylinder, the upper end of the threaded rod is connected to the spline shaft, the lower end of the threaded rod is connected to the driving pin, the threaded sleeve is threadedly connected to the threaded rod, and the threaded sleeve is fixed at the center position of the bottom plate of the mounting disk. The driving pin drives the driving disk to rotate through the linkage of various components, and during its rotation, each slide plate is pushed to slide through each group of transmission components to push each positioning roller to simultaneously contact the inner wall of the cylinder.

[0012] Each transmission assembly of the present invention includes an inclined groove opened on the driving disk, a transmission plate, a transmission pin fixed on the lower surface of the transmission plate, a strip plate connected to the inner end of the slide plate, an elastic component arranged between the transmission plate and the strip plate, and a guide component for guiding the transmission plate during the transmission process, wherein the transmission pin is located in the inclined groove and can slide along the inclined groove.

[0013] The elastic component of the present invention includes a sleeve, a slide rod and a second spring, one end of the sleeve is connected to a transmission plate or a strip plate, one end of the slide rod is connected to a strip plate or a transmission plate, the other end of the slide rod extends into the other end of the sleeve, and the second spring is sleeved on the sleeve and the slide rod.

[0014] The guide assembly of the present invention comprises fixed blocks fixed on both sides of the transmission plate and a pair of T-shaped rods, the fixed blocks are slidably mounted on the T-shaped rods, and the rod ends of the T-shaped rods are fixed on the inner wall of the mounting cavity.

[0015] The present invention provides a positioning component and a limiting component between the mounting seat and the magnetic base table, the positioning component includes a positioning groove opened on the top surface of the mounting seat and a positioning block provided at the lower end of the magnetic base table, the positioning block is adapted to be installed in the positioning groove to position and install the magnetic base table; the limiting component includes a support frame provided on one side of the top surface of the mounting seat, threaded holes for screws to be inserted are provided on the support frame and the magnetic base table, the support frame and the magnetic base table are connected by screws to limit and position the installed magnetic base table.

[0016] Compared with the prior art, the present invention has the following significant effects:

[0017] (1) After the B737NG main landing gear outer cylinder is processed, when the processing effect of the chamfered area is tested, the present invention uses a positioning roller to abut against the inner wall of the cylinder body to center the mounting seat and the magnetic seat table inside the B737NG main landing gear outer cylinder, which is convenient for auxiliary detection operations, thereby ensuring the quality of centering detection.

[0018] (2) During the centering detection process, the cleaning component is used to clean the position of the positioning roller to ensure the centering effect and further ensure the quality of the centering detection.

[0019] ⑶ The invention has the advantages of simple structure, low cost, convenient operation, strong practicability and is suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the B737NG main landing gear outer cylinder and partial structure;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the centering component of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the positioning component and the limiting component of the present invention;

[0025] Figure 5 It is a schematic diagram of the cleaning component and the exhaust component structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the air extraction component of the present invention;

[0027] Figure 7 It is a schematic diagram of the driving mechanism structure of the present invention;

[0028] Figure 8 It is a schematic diagram of the transmission assembly structure of the present invention.

[0029] In the figure: 101-mounting seat; 102-magnetic seat table; 201-positioning groove; 202-positioning block; 301-support frame; 302-threaded hole; 303-screw; 4-connecting rod; 5-mounting plate; 601-sliding hole; 602-slide plate; 603-mounting frame; 604-mounting shaft; 605-positioning roller; 701-exhaust pipe; 702-reciprocating pipe; 801-mounting pipe; 802-check valve; 803-operating pipe; 804-piston plate; 901-push rod; 902-first spring; 1001-rotating plate; 1002-protrusion; 1101-strip plate; 1102-transmission plate; 1201-sleeve; 1202-slide rod; 1203-second spring; 1301-fixed block; 1302-T-bar; 1401-driving plate; 1402-slanted groove; 1403-driving pin; 1501-threaded sleeve; 1502-threaded rod; 1503-driving pin; 1601-spline cylinder; 1602-spline shaft; 1-B737NG main landing gear outer cylinder; 2-chrome layer chamfer. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and only schematic diagrams are shown, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the figures.

[0031] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the figure. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the figures are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0032] like Figures 2 to 8 As shown, a B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool of the present invention comprises a mounting seat 101, a magnetic seat gauge 102 (belonging to the prior art) arranged on the mounting seat 101, a connecting rod 4, a mounting plate 5 with a mounting cavity, a driving mechanism arranged in the mounting cavity and a plurality of sets of centering components arranged along the side circumference of the mounting plate 5, the mounting seat 101 can be rotatably mounted on the upper end of the connecting rod 4, the lower end of the connecting rod 4 is connected to the mounting plate 5, each set of centering components comprises a slide plate 602, a mounting frame 603 and a mounting plate 604 rotatably mounted on the mounting frame The positioning roller 605 on 603, the slide plate 602 extends into the installation cavity through the sliding hole 601 on the side of the installation plate 5 and can slide along the sliding hole, the outer end of the slide plate 602 is connected to the mounting frame 603, and the inner end is connected to the driving mechanism so that the slide plates 602 of each group of centering components can slide outward or inward at the same time, so that when the slide plate 602 slides outward, the mounting frame 603 pushes the positioning roller 605 to contact the inner wall of the cylinder to achieve centering support, or when the slide plate 602 slides inward, the mounting frame 603 pulls the positioning roller 605 away from the inner wall of the cylinder.

[0033] A cleaning assembly for cleaning the position where the positioning roller 605 is positioned during the centering process is provided on the mounting frame 603. The cleaning assembly includes an exhaust pipe 701, a round pipe 702, and an exhaust assembly for exhausting air from the inside of the round pipe 702, one end of the exhaust pipe 701 faces the inner wall of the cylinder, and the other end is connected to the round pipe 702. The exhaust assembly is connected to the round pipe 702, and the dust at the position where the positioning roller 605 is positioned is sucked into the round pipe 702 by the exhaust pipe 701 through the exhaust action of the exhaust assembly. Specifically, the mounting frame 603 is a "["-shaped plate, the positioning roller 605 is fixed on the mounting shaft 604, and the two ends of the mounting shaft 604 are rotatably mounted on the top and bottom surfaces of the mounting frame 603, wherein there are multiple exhaust pipes 701 and they are located on both sides of the positioning roller 605, the round pipe 702 is located on the back of the mounting frame 603, and the exhaust assembly is located on the top surface of the mounting frame 603. The exhaust assembly includes a vertical installation tube 801, a horizontal operating tube 803, a pair of one-way valves 802, a horizontal push rod 901, a piston plate 804 and a rotating disk 1001 with a plurality of protrusions 1002 on the side circumference. The rotating disk 1001 is installed at the upper end of the installation shaft 604. The lower end of the installation tube 801 is connected to the return tube 702. The pair of one-way valves 802 are installed in the installation tube 801. The conducting direction of the pair of one-way valves 802 is from the inside of the return tube 702 to the outside of the installation tube 801. The operating tube 80 One end of the push rod 901 is connected to the mounting tube 801 and the connection part is between the pair of one-way valves 802. The push rod 901 penetrates into the other end of the operating tube 803 and is connected to a piston plate 804 that can slide in the operating tube 803. The outer end of the push rod 901 cooperates with the protrusion 1002 on the rotating disk 1001 so that the push rod 901 can be squeezed and pushed by the protrusion 1002 when the rotating disk 1001 rotates. The push rod 901 is sleeved with a first spring 902, and the first spring 902 is located between the piston plate 804 and the end of the operating tube 803. The protrusion 1002 squeezes the push rod 901, so that the piston plate 804 reciprocates inside the operating tube 803 as the installation shaft 604 rotates. Since the conduction direction of the one-way valve 802 is from the inside of the round tube 702 to the outside of the installation tube 801, the reciprocating movement of the piston plate 804 generates an exhaust pressure inside the installation tube 801. Through the exhaust action, the dust on the front side of the rotation position of the positioning roller 605 is sucked into the inside of the round tube 702 through the exhaust pipe 701, and the position where the positioning roller 605 is positioned is cleaned to ensure the effect of centering and further ensure the quality of centering detection. Because the positioning roller 605 is against the inner wall of the outer tube of the B737NG main landing gear, the positioning roller 605 and the installation shaft 604 are driven to rotate through friction, and during the rotation of the installation shaft 604, the rotating disk 1001 is driven to rotate.

[0034] The driving mechanism includes a spline cylinder 1601, a spline shaft 1602, a threaded sleeve 1501, a threaded rod 1502, a driving pin 1503, a driving disk 1401 and multiple groups of transmission components. The spline cylinder 1601 can be rotatably installed at the center position of the top plate of the mounting disk 5, the driving disk 1401 is fixed on the spline cylinder 1601, the spline shaft 1602 is slidably installed on the spline cylinder 1601, the upper end of the threaded rod 1502 is connected to the spline shaft 1602, the lower end of the threaded rod 1502 is connected to the driving pin 1503, the threaded sleeve 1501 is threadedly connected to the threaded rod 1502, the threaded sleeve 1501 is fixed at the center position of the bottom plate of the mounting disk 5, and the driving pin 1503 drives the driving disk 1401 to rotate through the linkage of various components, and during its rotation, each slide plate is pushed to slide through each group of transmission components to push each positioning roller to simultaneously contact the inner wall of the cylinder. The threaded rod 1502 is driven to rotate by the driving pin 1503 . During the rotation of the threaded rod 1502 , the driving disc 1401 is driven to rotate by the connecting transmission effect between the spline shaft 1602 and the spline cylinder 1601 .

[0035] Each transmission assembly includes an inclined groove 1402 provided on a driving plate 1401, a transmission plate 1102, a transmission pin 1403 fixed on the lower surface of the transmission plate 1102, a strip plate 1101 connected to the inner end of the slide plate 602, an elastic assembly provided between the transmission plate 1102 and the strip plate 1101, and a guide assembly for guiding the transmission plate 1102 during transmission. The transmission pin 1403 is located in the inclined groove 1402 and can slide along the inclined groove 1402. The elastic assembly includes a sleeve 1201, a slide bar 1202, and a second spring 1203. One end of the sleeve 1201 is connected to the transmission plate 1102, one end of the slide bar 1202 is connected to the strip plate 1101, the other end of the slide bar 1202 extends into the other end of the sleeve 1201, and the second spring 1203 is sleeved on the sleeve 1201 and the slide bar 1202. The guide assembly includes a fixed block 1301 and a pair of T-shaped rods 1302 fixed on both sides of the transmission plate 1102. The fixed block 1301 is slidably mounted on the T-shaped rods 1302, and the rod ends of the T-shaped rods 1302 are fixed on the inner wall of the installation cavity. The movement of the transmission plate 1102 after being subjected to force is guided by the fixed block 1301 and the T-shaped rods 1302.

[0036] The driving disk 1401 is driven to rotate. During the rotation of the driving disk 1401, each group of transmission plates 1102 is driven to move toward the outside of the mounting disk 5 through the interaction between each group of inclined grooves 1402 and each group of transmission pins 1403. During the movement, each group of slide plates 602 is pushed to move toward the outside of the mounting disk 5 on the sliding hole 601 through the connection action of the elastic component.

[0037] After the positioning rollers 605 of the mounting frame 603 at the end of each group of slide plates 602 abut against the inner wall of the outer tube of the B737NG main landing gear, the transmission plate 1102 continues to be driven to move outward. Due to the abutment and limiting effect of the inner part of the outer tube of the B737NG main landing gear on the positioning rollers 605 and the slide plates 602, the transmission plate 1102 moves toward the strip plate 1101. During the movement, the second springs 1203 of each group on the elastic assembly are deformed to generate elastic force. Through the elastic force of the second springs 1203, The positioning roller 605 is pushed to press against the inner wall of the outer tube of the B737NG main landing gear with a greater force to improve the centering and positioning effect. After the centering of the mounting seat 101 and the magnetic seat gauge 102 is completed, the mounting seat 101 is rotated. During the rotation, the processing condition of the chamfering inside the outer tube of the B737NG main landing gear is detected by the magnetic seat gauge 102. Through multiple sets of sleeves 1201 and slide rods 1202, the telescopic movement between the transmission plate 1102 and the strip plate 1101 is guided.

[0038] A positioning component and a limiting component are provided between the mounting base 101 and the magnetic base meter 102. The positioning component includes a positioning groove 201 opened on the top surface of the mounting base 101 and a positioning block 202 provided at the lower end of the magnetic base meter 102. The positioning block 202 is adapted to be installed in the positioning groove 201 to position and install the magnetic base meter 102. The limiting component includes a support frame 301 provided on one side of the top surface of the mounting base 101. A threaded hole 302 for a screw 303 to penetrate is provided on the support frame 301. The screw 303 connects the support frame 301 and the magnetic base meter 102 to limit and position the installed magnetic base meter 102.

[0039] The working principle of the present invention is as follows:

[0040] After the outer tube of the B737NG main landing gear is processed, the processing effect of the chamfered area is tested. During the testing process, the magnetic base table 102 is installed on the mounting seat 101 through the positioning component and the limit component. After the installation is completed, the mounting seat 101 is moved to the inside of the outer tube of the B737NG main landing gear. After the movement is completed, the threaded rod 1502 is driven to rotate through the driving pin 1503. During the rotation of the threaded rod 1502, the driving disk 1401 is driven to rotate through the connection transmission action of the spline shaft 1602 and the spline cylinder 1601, and the entire driving disk During the rotation of 1401, the self-locking effect of the mutual engagement between the threaded rod 1502 and the threaded sleeve 1501 allows the driving disk 1401 to maintain the rotated state after being driven to rotate, which is convenient for subsequent stable centering operation; and during the rotation of the driving disk 1401, each group of inclined grooves 1402 interacts with each group of transmission pins 1403, so that each group of transmission plates 1102 is driven to move toward the outside of the mounting disk 5. During the movement, the connection of the elastic component pushes each group of slide plates 602 to move toward the outside of the mounting disk 5 on the sliding hole 601. During the movement, the positioning rollers 605 on the mounting brackets 603 at the ends of the slide plates 602 are respectively in contact with the inner wall of the outer tube of the B737NG main landing gear. Through the pushing action of the positioning rollers 605, the mounting seat 101 and the magnetic seat table 102 are centrally positioned inside the outer tube of the B737NG main landing gear. After the positioning rollers 605 on the mounting brackets 603 at the ends of the slide plates 602 are in contact with the inner wall of the outer tube of the B737NG main landing gear, the transmission plate 1102 is continuously driven to move outward. The mutually limiting effect causes the transmission plate 1102 to move toward the strip plate 1101. During the movement, the second springs 1203 of the elastic assembly are deformed to generate elastic force. The elastic force of the second springs 1203 pushes the positioning roller 605 to resist the inner wall of the outer tube of the B737NG main landing gear with a greater force, thereby improving the centering and positioning effect. After the centering of the mounting seat 101 and the magnetic seat table 102 is completed, the mounting seat 101 is rotated. During the rotation, the processing condition of the chamfering inside the outer tube of the B737NG main landing gear is detected by the magnetic seat table 102.In the process of detecting the internal chamfer of the outer tube of the B737NG main landing gear by rotating the mounting seat 101, the positioning roller 605 abuts against the inner wall of the outer tube of the B737NG main landing gear, and the positioning roller 605 and the mounting shaft 604 are driven to rotate through friction. During the rotation of the mounting shaft 604, the rotating disk 1001 is driven to rotate. During the rotation of the rotating disk 1001, the pushing action of one side of each group of protrusions 1002 against the push rod 901 and the reset action of the first spring 902 on the push rod 901 after the movement are used to make the movable The plug plate 804 reciprocates inside the operating tube 803 as the installation shaft 604 rotates. Since the conducting direction of the two sets of one-way valves 802 is from the inside of the round tube 702 to the outside of the installation tube 801, the reciprocating movement of the piston plate 804 generates an exhaust pressure inside the installation tube 801. Through the exhaust action, the dust on the front side of the rotating position of the positioning roller 605 is sucked into the inside of the round tube 702 through the exhaust pipe 701, and the position where the positioning roller 605 is positioned is cleaned, ensuring the effect of centering positioning, and further ensuring the quality of centering detection. ;

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A tool for measuring the chamfer depth of the inner chrome layer of the outer cylinder of the B737NG main landing gear, characterized in that: The invention comprises a mounting seat, a magnetic seat table arranged on the mounting seat, a connecting rod, a mounting disk with a mounting cavity, a driving mechanism arranged in the mounting cavity and a plurality of groups of centering components arranged along the side circumference of the mounting disk, the mounting seat can be rotatably mounted on the upper end of the connecting rod, the lower end of the connecting rod is connected to the mounting disk, each group of centering components comprises a slide plate, a mounting frame and a positioning roller rotatably mounted on the mounting frame, the slide plate extends into the mounting cavity through a sliding hole on the side of the mounting disk and can slide along the sliding hole, the outer end of the slide plate is connected to the mounting frame, and the inner end is connected to the driving mechanism so that the slide plates of each group of centering components can slide outward or inward at the same time, so that when the slide plate slides outward, the positioning roller is pushed by the mounting frame to contact the inner wall of the cylinder to realize centering support, or when the slide plate slides inward, the positioning roller is pulled away from the inner wall of the cylinder by the mounting frame.

2. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 1, characterized in that: A cleaning component for cleaning the position where the positioning roller is positioned during the centering process is provided on the mounting frame.

3. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 2 is characterized by: The cleaning assembly includes an exhaust pipe, a loop-shaped pipe and an exhaust assembly for exhausting air from the inside of the loop-shaped pipe, which are arranged on a mounting frame. One end of the exhaust pipe faces the inner wall of the cylinder, and the other end is connected to the loop-shaped pipe. The exhaust assembly is connected to the loop-shaped pipe, and dust at the position where the positioning roller is positioned is sucked into the loop-shaped pipe through the exhaust pipe through the exhaust action of the exhaust assembly.

4. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 3, characterized in that: The mounting frame is a "["-shaped plate, the positioning roller is fixed on the mounting shaft and the two ends of the mounting shaft are rotatably mounted on the top and bottom surfaces of the mounting frame, there are multiple exhaust pipes and they are located on both sides of the positioning roller, the ring-shaped pipe is located on the back of the mounting frame, and the exhaust assembly is located on the top surface of the mounting frame.

5. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 4, characterized in that: The vacuum assembly includes a vertical mounting tube, a horizontal operating tube, a pair of one-way valves, a horizontal push rod, a piston plate and a rotating disk with a plurality of protrusions on the side circumference. The rotating disk is mounted on the upper end of the mounting shaft, and the lower end of the mounting tube is connected to the ring tube. The pair of one-way valves are mounted in the mounting tube, and one end of the operating tube is connected to the mounting tube and the connecting part is between the pair of one-way valves. The push rod penetrates into the other end of the operating tube and is connected to a piston plate that can slide in the operating tube. The outer end of the push rod cooperates with the protrusion on the rotating disk so that the push rod can be squeezed and pushed by the protrusion when the rotating disk rotates. A first spring is sleeved on the push rod, and the first spring is located between the piston plate and the end of the operating tube.

6. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 5, characterized in that: The driving mechanism includes a spline cylinder, a spline shaft, a threaded sleeve, a threaded rod, a driving pin, a driving disk and multiple groups of transmission components. The spline cylinder can be rotatably installed at the center position of the top plate of the mounting disk, the driving disk is fixed on the spline cylinder, the spline shaft is slidably installed on the spline cylinder, the upper end of the threaded rod is connected to the spline shaft, the lower end of the threaded rod is connected to the driving pin, the threaded sleeve is threadedly connected to the threaded rod, and the threaded sleeve is fixed at the center position of the bottom plate of the mounting disk. The driving pin drives the driving disk to rotate through the linkage of various components, and during its rotation, each slide plate is pushed to slide through each group of transmission components to push each positioning roller to simultaneously contact the inner wall of the cylinder.

7. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 6, characterized in that: Each transmission assembly includes an inclined groove opened on the driving disk, a transmission plate, a transmission pin fixed on the lower surface of the transmission plate, a strip plate connected to the inner end of the slide plate, an elastic component arranged between the transmission plate and the strip plate, and a guide component for guiding the transmission plate during the transmission process, and the transmission pin is located in the inclined groove and can slide along the inclined groove.

8. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 7, characterized in that: The elastic component includes a sleeve, a slide rod and a second spring. One end of the sleeve is connected to a transmission plate or a strip plate, one end of the slide rod is connected to a strip plate or a transmission plate, the other end of the slide rod extends into the other end of the sleeve, and the second spring is sleeved on the sleeve and the slide rod.

9. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 8, characterized in that: The guide assembly comprises fixed blocks fixed on both sides of the transmission plate and a pair of T-shaped rods, the fixed blocks are slidably mounted on the T-shaped rods, and the rod ends of the T-shaped rods are fixed on the inner wall of the mounting cavity.

10. The B737NG main landing gear outer tube inner chrome layer chamfer depth measuring tool according to claim 9, characterized in that: A positioning component and a limiting component are provided between the mounting seat and the magnetic base table, the positioning component includes a positioning groove opened on the top surface of the mounting seat and a positioning block provided at the lower end of the magnetic base table, the positioning block is adapted to be installed in the positioning groove to position and install the magnetic base table; the limiting component includes a support frame provided on one side of the top surface of the mounting seat, threaded holes for screws to be inserted are provided on the support frame and the magnetic base table, the support frame and the magnetic base table are connected by screws to limit and position the installed magnetic base table.

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