Elastic self-centering coaxiality measuring device

Abstract

The invention discloses an elastic self-centering coaxiality measuring device, and belongs to the technical field of aero-engine process equipment and manufacturing, the elastic self-centering coaxiality measuring device comprises a meter rod joint, the meter rod joint is arranged on a connecting shaft, and the connecting shaft penetrates through a clamp body and then is connected with a rotating connecting rod; the clamp body comprises a base part and a limiting cylinder part. The expansion sleeve is used for being arranged on the base part in a sleeving mode, and a cavity liquid chamber is defined by the expansion sleeve and the side wall of the base part. An oil storage cavity is formed in the oil injection part, a piston part is movably arranged in the oil storage cavity, a first sealing part is arranged in the oil injection hole, and the first sealing part is further used for pushing the piston part to compress hydraulic oil in the oil storage cavity and pushing the hydraulic oil into the cavity liquid chamber through the oil inlet hole and the second oil passing hole when screwed into the oil injection hole; and the side wall of the expansion sleeve is extruded along the radial direction, so that the expansion sleeve tightly presses the inner wall of the inclined hole to be measured. The side wall of the expansion sleeve is controlled to elastically stretch out and draw back through the hydraulic oil so as to be more tightly matched with the to-be-measured inclined hole, the phenomena of loosening or jumping and the like of the measuring device are avoided, and the measuring accuracy is improved.

Description

Technical Field

[0001] The present application relates to the field of aircraft engine process equipment and manufacturing technology, and in particular, to an elastic self-centering coaxiality measuring device. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] When assembling the oblique transmission of the transmission parts of the aircraft engine accessories, it is necessary to measure the coaxiality of the oblique transmission, that is, to measure the coaxiality of the two inclined holes. For details, please refer to Fig.10 , Fig.10 This is a schematic diagram of the two inclined holes of the accessory casing oblique transmission, where the coaxiality of the φA hole and the φB hole in the casing needs to be measured. Since the distance between the two holes is large and both are inclined holes, the measurement is difficult. In the past, the coaxiality measurement tooling was positioned with the φB hole. For the convenience of taking and placing, the coaxiality measurement tooling positioning outer circle and the casing inner hole φB hole were clearance matched, resulting in a large coaxiality measurement error between the φA hole and the φB hole.

[0004] For the coaxiality measurement of inclined holes with large intervals like this, we provide a self-centering coaxiality measuring device to achieve stable and accurate clamping and positioning, avoid loosening or jumping of the measuring device, and facilitate disassembly and installation to ensure accurate and reliable measurement results.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of at least one of the above technical problems, the present application provides an elastic self-centering coaxiality measuring device, which can control the elastic expansion and contraction of the side wall of the expansion sleeve through hydraulic oil to fit more closely with the inclined hole to be measured, thereby avoiding loosening or jumping of the measuring device and improving the measurement accuracy.

[0007] According to one aspect of the present application, an elastic self-centering coaxiality measuring device is provided, which is used to measure the coaxiality of inclined holes arranged at intervals. The elastic self-centering coaxiality measuring device includes a connecting shaft, a gauge rod joint, a clamp body, an expansion sleeve, an oil injection piece and a rotating connecting rod:

[0008] The gauge rod joint is arranged at the first end of the connecting shaft, the gauge rod joint is used to install the dial gauge, the second end of the connecting shaft is used to penetrate the clamp body and then be connected to the rotating connecting rod, and the rotating connecting rod is used to drive the connecting shaft and the gauge rod joint to rotate;

[0009] The clamp body comprises a base part and a limiting cylinder part, the limiting cylinder part is arranged on the base part, the expansion sleeve is used to be arranged on the base part and enclosed with the side wall of the base part to form a cavity liquid chamber, the expansion sleeve is also used to have an interference fit with the inner wall of one of the inclined holes to be measured, a plurality of pressure relief holes are arranged at intervals at the bottom end of the base part, a plurality of first oil holes are arranged on the side wall of the base part, each of the first oil holes is respectively connected with each of the pressure relief holes, and then the pressure relief holes are connected with the cavity liquid chamber, and each of the pressure relief holes is sealed by a second sealing member; an oil inlet hole is arranged at the bottom end of the base part, a second oil hole is arranged on the side wall of the base part, the second oil hole is connected with the oil inlet hole, and then the oil inlet hole is connected with the cavity liquid chamber;

[0010] The oil filling piece is arranged at the bottom end of the base part, and an oil storage chamber is provided inside the oil filling piece, and a piston piece is movably arranged in the oil storage chamber. The top of the oil storage chamber is connected with the oil inlet hole, and an oil filling hole is provided at the bottom end of the oil filling piece. The oil filling hole is connected with the oil storage chamber and hydraulic oil is injected into the oil storage chamber through the oil filling hole. The oil filling hole is used to set a first sealing member and seal the oil filling hole through the first sealing member. The first sealing member is also used to push the piston piece to compress the hydraulic oil in the oil storage chamber when screwed into the oil filling hole and push the hydraulic oil into the cavity liquid chamber through the oil inlet hole and the second oil through hole, thereby squeezing the side wall of the expansion sleeve radially so that the expansion sleeve presses the inner wall of the measuring inclined hole.

[0011] In some embodiments of the present application, a circle of first arcuate grooves is formed on the side wall of the base portion, and a circle of second arcuate grooves is formed on the inner wall of the expansion sleeve. The second arcuate grooves are used to enclose the first arcuate grooves to form a cavity liquid chamber.

[0012] In some embodiments of the present application, the side wall of the first arc-shaped groove is used to abut against the limiting expansion sleeve, and the side wall of the expansion sleeve does not protrude from the side wall of the base portion when not mating with the inclined hole.

[0013] In some embodiments of the present application, the expansion sleeve is made of 60Si2Mn spring steel, and the hardness of the expansion sleeve is 44-48HRC.

[0014] In some embodiments of the present application, a mounting hole is provided on the base portion, the mounting hole is used to install an oil injection piece, the mounting hole is connected to the oil inlet hole, an oil outlet hole is provided at the top end of the oil injection piece, the oil outlet hole is used to connect to the oil inlet hole, a sealing groove is provided at the top end of the oil injection piece next to the oil outlet hole, the sealing groove is used to set a second sealing ring and seal the connecting surface between the oil injection piece and the mounting hole through the second sealing ring.

[0015] In some embodiments of the present application, the first sealing member is threadedly connected to the oil filling hole, and a connecting screw hole is opened on the first sealing member. The connecting screw hole is used to set a set screw, and the set screw is used to push the piston member to move when it is screwed into the connecting screw hole.

[0016] In some embodiments of the present application, the piston member includes a piston rod, and the side walls of the piston rod are spaced apart with annular sealing grooves, the annular sealing grooves are used to set a first sealing ring and seal the gap between the piston rod and the inner wall of the oil storage chamber through the first sealing ring.

[0017] In some embodiments of the present application, the second end of the connecting shaft passes through the limiting cylinder and the base in sequence and is connected to the rotating connecting rod through a second connecting screw. The rotating connecting rod is provided with an installation through hole along its radial direction. The installation through hole is used to set a handle and drive the rotating connecting rod and the connecting shaft to rotate through the handle.

[0018] In some embodiments of the present application, the side wall of the limiting cylinder is a multi-section splicing structure, and a limiting hole is opened in the side wall of each section of the limiting cylinder, and a limiting rod is arranged in the side wall of the limiting cylinder. The limiting rod is used to cooperate with the limiting holes of the side wall of each section of the limiting cylinder to limit and guide the side wall of each section of the limiting cylinder.

[0019] In some embodiments of the present application, a limiting screw hole is provided on the side wall of each section of the limiting cylinder, and the limiting screw hole is used to set a locking screw and cooperate with the preset through hole on the limiting rod through the locking screw, thereby locking and limiting the side wall of each section of the limiting cylinder and the limiting rod.

[0020] This application has the following beneficial effects:

[0021] The elastic self-centering coaxiality measuring device of the present application is used to install and fix measuring instruments such as micrometers through a gauge rod joint. The gauge rod joint is arranged on a connecting shaft. The connecting shaft passes through a clamp body and is connected to a rotating connecting rod. The connecting shaft and the measuring instrument are driven to rotate by the rotating connecting rod for measurement. The clamp body includes a limiting cylinder and a base body. An expansion sleeve is provided on the outer wall of the base body, and a cavity liquid chamber is formed between the expansion sleeve and the outer wall of the base body. An oil inlet hole is provided at the bottom end of the base body. The oil inlet hole is connected to the cavity liquid chamber through a second oil hole in the side wall of the base body. An oil injection piece is provided at the bottom end of the base body. Hydraulic oil is injected into the oil inlet hole and the cavity liquid chamber through the oil injection piece, so that the hydraulic oil squeezes the side wall of the expansion sleeve to press the inner wall of the inclined hole to be measured, thereby strengthening the stability of the connection between the expansion sleeve and the inclined hole, avoiding loosening of the measuring device, and ensuring the measurement accuracy.

[0022] The oil filling hole of the oil filling part is sealed by a first sealing part, and the first sealing part also serves to push the piston part in the oil storage chamber to move during the screwing process, so as to push the hydraulic oil in the oil storage chamber into the oil inlet hole and the cavity liquid chamber. Therefore, the first sealing part has multiple functions, which can facilitate workers to operate and control conveniently, facilitate the measuring device to be limited and fixed in the inclined hole, and the subsequent disassembly, which is conducive to improving the measurement operation efficiency.

[0023] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the installation of the oil injection piece of the preferred embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the position of the cavity liquid chamber of the preferred embodiment of the present application;

[0028] Figure 4 It is a half-section schematic diagram of a preferred embodiment of the present application;

[0029] Figure 5 This is a schematic diagram of the bottom structure of the clamp body of the preferred embodiment of the present application;

[0030] Figure 6 This is a schematic diagram of the internal structure of the clamp body of the preferred embodiment of the present application;

[0031] Figure 7 It is a schematic diagram of the installation of the handle of the preferred embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the structure of the oil injection piece of the preferred embodiment of the present application;

[0033] Fig. 9 This is a schematic diagram of the internal structure of the oil injection part of the preferred embodiment of the present application;

[0034] Fig.10 It is a schematic diagram of two oblique holes for oblique transmission of an existing accessory case;

[0035] Legend: 1. Connecting shaft; 2. Meter rod joint; 3. Clamp body; 31. Base; 32. Limiting cylinder; 311. Pressure relief hole; 312. First oil hole; 313. Mounting hole; 314. Oil inlet hole; 315. Second oil hole; 4. Expansion sleeve; 5. First connecting screw; 6. Oil filling piece; 61. Oil filling hole; 62. Oil storage chamber; 63. Mounting platform; 7. Piston piece; 8. First sealing piece; 9. Adjusting washer; 10. Rotating connecting rod; 11. Handle; 12. First sealing ring; 13. Set screw; 14. Second sealing ring; 15. Second sealing piece; 16. Positioning pin; 17. Second connecting screw; 18. Cavity liquid chamber. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0037] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present application; Figure 2 It is a schematic diagram of the installation of the oil injection piece of the preferred embodiment of the present application; Figure 3 is a schematic diagram of the position of the cavity liquid chamber of the preferred embodiment of the present application; Figure 4 It is a half-section schematic diagram of a preferred embodiment of the present application; Figure 5 This is a schematic diagram of the bottom structure of the clamp body of the preferred embodiment of the present application; Figure 6 This is a schematic diagram of the internal structure of the clamp body of the preferred embodiment of the present application; Figure 7 It is a schematic diagram of the installation of the handle of the preferred embodiment of the present application; Figure 8 This is a schematic diagram of the structure of the oil injection piece of the preferred embodiment of the present application; Fig. 9 This is a schematic diagram of the internal structure of the oil injection part of the preferred embodiment of the present application; Fig.10 It is a schematic diagram of two oblique holes of the existing accessory case oblique transmission.

[0038] An elastic self-centering coaxiality measuring device is used to measure the coaxiality of inclined holes arranged at intervals. The elastic self-centering coaxiality measuring device comprises a connecting shaft 1, a gauge rod joint 2, a clamp body 3, an expansion sleeve 4, an oil injection piece 6 and a rotating connecting rod 10:

[0039] The gauge rod joint 2 is arranged at the first end of the connecting shaft 1, and the gauge rod joint 2 is used to install the dial gauge. The second end of the connecting shaft 1 is used to penetrate the clamp body 3 and then be connected to the rotating connecting rod 10, and the rotating connecting rod 10 is used to drive the connecting shaft 1 and the gauge rod joint 2 to rotate;

[0040] The clamp body 3 includes a base portion 31 and a limiting cylinder portion 32, the limiting cylinder portion 32 is arranged on the base portion 31, the expansion sleeve 4 is used to be sleeved on the base portion 31 and enclosed with the side wall of the base portion 31 to form a cavity liquid chamber 18, and the expansion sleeve 4 is also used to interference fit with the inner wall of one of the inclined holes to be measured, a plurality of pressure relief holes 311 are spaced apart at the bottom end of the base portion 31, a plurality of first oil holes 312 are opened on the side wall of the base portion 31, each of the first oil holes 312 is communicated with each of the pressure relief holes 311, and then the pressure relief holes 311 are connected with the cavity liquid chamber 18, and each of the pressure relief holes 311 is sealed by the second sealing member 15; an oil inlet hole 314 is opened at the bottom end of the base portion 31, and a second oil through hole 315 is opened on the side wall of the base portion 31, and the second oil through hole 315 is communicated with the oil inlet hole 314, and then the oil inlet hole 314 is connected with the cavity liquid chamber 18;

[0041] The oil injection piece 6 is arranged at the bottom end of the base portion 31, and an oil storage chamber 62 is opened inside the oil injection piece 6, and a piston piece 7 is movably arranged in the oil storage chamber 62. The top of the oil storage chamber 62 is connected with the oil inlet hole 314, and an oil injection hole 61 is opened at the bottom end of the oil injection piece 6. The oil injection hole 61 is connected with the oil storage chamber 62 and hydraulic oil is injected into the oil storage chamber 62 through the oil injection hole 61. The oil injection hole 61 is used to set the first sealing member 8 and seal the oil injection hole 61 through the first sealing member 8. The first sealing member 8 is also used to push the piston member 7 to compress the hydraulic oil in the oil storage chamber 62 when the oil injection hole 61 is screwed into the first sealing member 8, and push the hydraulic oil into the cavity liquid chamber 18 through the oil inlet hole 314 and the second oil hole 315, thereby squeezing the side wall of the expansion sleeve 4 in the radial direction so that the expansion sleeve 4 presses the inner wall of the measuring inclined hole.

[0042] Here, the meaning of "expansion sleeve 4" refers to a structure connected to the outer wall of the base portion 31. In some embodiments, the expansion sleeve 4 is a circular ring structure, and two welding chamfers are processed at both ends of the joint surface between the inner hole of the expansion sleeve 4 and the outer wall of the base portion 31. The expansion sleeve 4 is set on the outer wall of the base portion 31 for assembly and then sealed by welding. Of course, this application does not exclude the solution that the expansion sleeve 4 is connected to the base portion 31 by bolts.

[0043] Here, the “second sealing member 15 ” means a component for sealing the pressure relief hole 311 . In some embodiments, the second sealing member 15 is a plunger screw.

[0044] It should be noted that there are preferably three pressure relief holes 311 , which together with the oil inlet hole 314 can form the four corners of a quadrilateral, that is, arranged in a circular array, to ensure the pressure balance of the cavity liquid chamber 18 , and to facilitate rapid dumping of hydraulic oil by opening the pressure relief holes 311 .

[0045] The elastic self-centering coaxiality measuring device of the present application is installed and fixed with a measuring instrument such as a micrometer through a gauge rod joint 2. The gauge rod joint 2 is arranged on a connecting shaft 1. The connecting shaft 1 passes through a clamp body 3 and is connected with a rotating connecting rod 10. The connecting shaft 1 and the measuring instrument are driven to rotate by the rotating connecting rod 10 for measurement. The clamp body 3 includes a limit cylinder 32 and a base 31. An expansion sleeve 4 is provided on the outer wall of the base 31, and a cavity liquid chamber 18 is formed between the expansion sleeve 4 and the outer wall of the base 31. The bottom An oil inlet hole 314 is provided at the bottom end of the seat portion 31, and the oil inlet hole 314 is connected to the cavity liquid chamber 18 through a second oil hole 315 in the side wall of the base portion 31. An oil injection piece 6 is provided at the bottom end of the base portion 31, and hydraulic oil is injected into the oil inlet hole 314 and the cavity liquid chamber 18 through the oil injection piece 6, so that the hydraulic oil squeezes the side wall of the expansion sleeve 4 to press the inner wall of the inclined hole to be measured, thereby strengthening the stability of the connection between the expansion sleeve 4 and the inclined hole, avoiding loosening of the measuring device, and ensuring the accuracy of the measurement.

[0046] The oil filling hole 61 of the oil filling member 6 is sealed by the first sealing member 8. The first sealing member 8 also serves to push the piston member 7 in the oil storage chamber 62 to move during the screwing process, so as to push the hydraulic oil in the oil storage chamber 62 into the oil inlet hole 314 and the cavity liquid chamber 18. Therefore, the first sealing member 8 has multiple functions, which can facilitate workers to operate and control conveniently, facilitate the measuring device to be limited and fixed in the inclined hole, and the subsequent disassembly, which is conducive to improving the measurement operation efficiency.

[0047] Preferably, please refer to Figure 3 , 4 As shown, a circle of first arc-shaped grooves is formed on the side wall of the base portion 31 , and a circle of second arc-shaped grooves is formed on the inner wall of the expansion sleeve 4 . The second arc-shaped grooves are used to enclose the first arc-shaped grooves to form a cavity liquid chamber 18 .

[0048] It can be understood that the first arc groove on the side wall of the base portion 31 can limit the expansion sleeve 4, making it convenient for the installation of the expansion sleeve 4. At the same time, in conjunction with the second arc groove opened on the inner wall of the inner hole of the expansion sleeve 4, a circle of cavity liquid chamber 18 can be formed. The opening of the second arc groove makes the side wall of the expansion sleeve 4 have a circle of thinner wall thickness parts, which can improve the elastic performance, so that the hydraulic oil can squeeze the expansion sleeve 4 to smoothly undergo radial elastic displacement, thereby pressing the inner wall of the measuring inclined hole with the measuring belt to more stably limit and fix the measuring device.

[0049] Preferably, please refer to Figure 2 As shown, the side wall of the first arc-shaped groove is used to abut against the limiting expansion sleeve 4, and the side wall of the expansion sleeve 4 does not protrude from the side wall of the base portion 31 when not matched with the inclined hole.

[0050] It can be understood that in order to allow the base portion 31 and the expansion sleeve 4 to be smoothly inserted into the inclined hole to be measured at the same time, it is necessary to avoid the side wall of the expansion sleeve 4 protruding from the side wall of the base portion 31 to avoid jamming at the expansion sleeve 4 during installation. Therefore, the expansion sleeve 4 is installed through the first arc groove. At the same time, the side wall of the first arc groove can axially limit the expansion sleeve 4 when it is inserted into the inclined hole, thereby reducing the axial deviation of the expansion sleeve 4 and ensuring smooth installation.

[0051] Preferably, the expansion sleeve 4 is made of 60Si2Mn spring steel, and the hardness of the expansion sleeve 4 is 44-48HRC.

[0052] It is understandable that in order to ensure that the elasticity of the expansion sleeve 4 and the side wall of the second arc groove is in the best state, the expansion sleeve 4 is preferably made of 60Si2Mn spring steel, and after rough machining, the expansion sleeve 4 is heat treated to the optimal hardness range of 44 to 48HRC.

[0053] Preferably, please refer to Figure 2 , 5 As shown in FIGS. 6 and 7 , a mounting hole 313 is provided on the base portion 31, and the mounting hole 313 is used for mounting the oil injection piece 6, and the mounting hole 313 is communicated with the oil inlet hole 314. An oil outlet hole is provided on the top of the oil injection piece 6, and the oil outlet hole is used to communicate with the oil inlet hole 314. A sealing groove is provided on the top of the oil injection piece 6 next to the oil outlet hole, and the sealing groove is used for arranging the second sealing ring 14 and sealing the connecting surface between the oil injection piece 6 and the mounting hole 313 through the second sealing ring 14.

[0054] It can be understood that the oil injection piece 6 is installed in a limited position through the mounting hole 313, which can ensure the installation stability of the oil injection piece 6 on the one hand, and on the other hand, a sealing surface can be formed between the side wall of the mounting hole 313 and the side wall of the oil injection piece 6, and a connecting surface can be formed at the bottom of the mounting hole 313 and the contact surface of the oil injection piece 6, and the connecting surface can be sealed in cooperation with the second sealing ring 14, thereby realizing a longer sealing area and ensuring that the hydraulic oil is not prone to leakage.

[0055] It should be noted that a mounting platform 63 is provided on the oil injection part 6, and a first mounting screw hole is opened on the mounting platform 63. The first mounting screw hole is used to set a first connecting screw 5 and cooperate with a preset second mounting screw hole on the base part 31 through the first connecting screw 5 to connect and fasten the mounting platform 63 to the base part 31.

[0056] Preferably, please refer to Figure 3 , 4 As shown, the first sealing member 8 is threadedly connected to the oil filling hole 61, and a connecting screw hole is provided on the first sealing member 8. The connecting screw hole is used to set a set screw 13, and the set screw 13 is used to push the piston member 7 to move when it is screwed into the connecting screw hole.

[0057] It can be understood that the set screw 13 can extend the length of the first sealing member 8. After the oil filling hole 61 is sealed by the first sealing member 8, if the piston member 7 needs to be pushed a longer distance, the set screw 13 can be adjusted to abut the piston member 7 to continuously push the piston member 7, and the hydraulic oil in the oil storage chamber 62 can be pushed into the cavity liquid chamber 18, thereby achieving stable sealing of the oil filling hole 61 and adjusting the pressure of the cavity liquid chamber 18. The operation is very convenient, and the structure of the first sealing member 8 and the set screw 13 is very simple, realizing multiple functions, and facilitating the operation and disassembly and maintenance of workers.

[0058] Preferably, please refer to Figure 3 , 4 As shown, the piston member 7 includes a piston rod, and the side wall of the piston rod is spaced apart with annular sealing grooves, and the annular sealing grooves are used to set the first sealing ring 12 and seal the gap between the piston rod and the inner wall of the oil storage chamber 62 through the first sealing ring 12.

[0059] It can be understood that in order to smoothly push the hydraulic oil in the oil storage chamber 62 into the cavity liquid chamber 18, the first sealing ring 12 is used to strengthen the sealing between the piston rod and the inner wall of the oil storage chamber 62, reduce the leakage of the gap between the piston rod and the oil storage chamber 62, and ensure that the piston rod can accurately control the pressure of the hydraulic oil in the cavity liquid chamber 18, thereby regulating the elastic expansion displacement of the side wall of the expansion sleeve 4, ensuring that the measuring device is stably limited and fixed in the inclined hole to be measured, and at the same time facilitating the subsequent reduction of the pressure in the cavity liquid chamber 18 for the disassembly of the measuring device.

[0060] Preferably, please refer to Figure 3 , 4 As shown, the second end of the connecting shaft 1 passes through the limiting cylinder 32 and the base 31 in sequence and is connected to the rotating connecting rod 10 through the second connecting screw 17. The rotating connecting rod 10 is provided with a mounting through hole along its radial direction. The mounting through hole is used to set the handle 11 and drive the rotating connecting rod 10 and the connecting shaft 1 to rotate through the handle 11.

[0061] It can be understood that the connecting shaft 1 is connected to the rotating connecting rod 10 through the second connecting screw 17, and the rotating connecting rod 10 can drive the connecting shaft 1, the meter rod joint 2 and the measuring instrument to rotate synchronously to complete the measurement. The installation through-hole on the rotating connecting rod 10 can facilitate the insertion and installation of the handle 11, so that the worker can drive the rotating connecting rod 10 to rotate through the handle 11, which is conducive to improving the convenience of operation.

[0062] It should be noted that a central countersunk hole is provided in the rotating connecting rod 10, and a first screw hole is provided at the bottom of the central countersunk hole. The first screw hole is used to connect with the second screw hole preset on the connecting shaft 1, and the second connecting screw 17 is screwed into the first screw hole and the second screw hole in sequence to connect and fasten the rotating connecting rod 10 to the connecting shaft 1, and the second connecting screw 17 can be conveniently disassembled and assembled through the central countersunk hole. At the same time, the rotating connecting rod 10 and the connecting shaft 1 are strengthened and limited by the positioning pin 16 to improve the accuracy of the rotation control; and the contact surface between the rotating connecting rod 10 and the base portion 31 can be provided with an adjustment washer 9 to play a limiting and protective role.

[0063] Preferably, the side wall of the limiting cylinder 32 is a multi-section splicing structure, and a limiting hole is opened in the side wall of each section of the limiting cylinder 32, and a limiting rod is arranged in the side wall of the limiting cylinder 32. The limiting rod is used to cooperate with the limiting holes of the side wall of each section of the limiting cylinder 32 to limit and guide the side wall of each section of the limiting cylinder 32.

[0064] It is understandable that by designing the side wall of the limiting cylinder 32 to have a multi-section spliced ​​structure, the overall length of the limiting cylinder 32 can be adjusted to accommodate the coaxiality measurement between inclined holes at different distances, which is beneficial to improving the adaptability of the measuring device.

[0065] Specifically, each section of the limiting cylinder 32 has a limiting screw hole on its side wall, and the limiting screw hole is used to set a locking screw and cooperate with a preset through hole on the limiting rod through the locking screw, thereby locking and limiting the side wall of each section of the limiting cylinder 32 with the limiting rod.

[0066] It can be understood that after the length adjustment of the limit cylinder 32 is completed, the locking screw can be screwed into the limit screw hole and the through hole on the limit rod in sequence to complete the locking and limiting of the side walls of each section of the limit cylinder 32. The operation is very simple and the function of the limit cylinder 32 is effectively expanded.

[0067] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0068] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. An elastic self-centering coaxiality measuring device for measuring the coaxiality of inclined holes arranged at intervals, characterized in that: The elastic self-centering coaxiality measuring device comprises a connecting shaft (1), a gauge rod joint (2), a clamp body (3), an expansion sleeve (4), an oil injection piece (6) and a rotating connecting rod (10): The gauge rod joint (2) is arranged at the first end of the connecting shaft (1), the gauge rod joint (2) is used to install the dial gauge, the second end of the connecting shaft (1) is used to pass through the clamp body (3) and then be connected to the rotating connecting rod (10), and the rotating connecting rod (10) is used to drive the connecting shaft (1) and the gauge rod joint (2) to rotate; The clamp body (3) comprises a base portion (31) and a limiting cylinder portion (32), wherein the limiting cylinder portion (32) is arranged on the base portion (31), and the expansion sleeve (4) is used to be sleeved on the base portion (31) and enclosed with the side wall of the base portion (31) to form a cavity liquid chamber (18), and the expansion sleeve (4) is also used to have an interference fit with the inner wall of one of the inclined holes to be measured, and a plurality of pressure relief holes (311) are spaced apart at the bottom end of the base portion (31), and a plurality of first oil holes (312) are opened on the side wall of the base portion (31). Each first oil hole (312) is connected to each pressure relief hole (311), thereby connecting the pressure relief hole (311) to the cavity liquid chamber (18); each pressure relief hole (311) is sealed by a second sealing member (15); an oil inlet hole (314) is provided at the bottom end of the base portion (31); a second oil hole (315) is provided on the side wall of the base portion (31); the second oil hole (315) is connected to the oil inlet hole (314), thereby connecting the oil inlet hole (314) to the cavity liquid chamber (18); An oil injection member (6) is arranged at the bottom end of the base portion (31), an oil storage chamber (62) is provided inside the oil injection member (6), a piston member (7) is movably provided inside the oil storage chamber (62), the top of the oil storage chamber (62) is connected to the oil inlet hole (314), an oil injection hole (61) is provided at the bottom end of the oil injection member (6), the oil injection hole (61) is connected to the oil storage chamber (62) and hydraulic oil is injected into the oil storage chamber (62) through the oil injection hole (61), and the oil injection hole (61) is provided. The first sealing member (8) is used to set the first sealing member (8) and seal the oil filling hole (61) through the first sealing member (8). The first sealing member (8) is also used to push the piston member (7) to compress the hydraulic oil in the oil storage chamber (62) when it is screwed into the oil filling hole (61) and push the hydraulic oil into the cavity liquid chamber (18) through the oil inlet hole (314) and the second oil hole (315), thereby squeezing the side wall of the expansion sleeve (4) in the radial direction so that the expansion sleeve (4) is pressed against the inner wall of the measuring inclined hole.

2. The elastic self-centering coaxiality measuring device according to claim 1, characterized in that: A circle of first arc-shaped grooves is formed on the side wall of the base portion (31), and a circle of second arc-shaped grooves is formed on the inner wall of the expansion sleeve (4). The second arc-shaped grooves are used to enclose the first arc-shaped grooves to form a cavity liquid chamber (18).

3. The elastic self-centering coaxiality measuring device according to claim 2, characterized in that: The side wall of the first arc-shaped groove is used to abut against the limiting expansion sleeve (4), and the side wall of the expansion sleeve (4) does not protrude from the side wall of the base portion (31) when not mating with the inclined hole.

4. An elastic self-centering coaxiality measuring device according to any one of claims 1 to 3, characterized in that: The expansion sleeve (4) is made of 60Si2Mn spring steel, and the hardness of the expansion sleeve (4) is 44-48HRC.

5. The elastic self-centering coaxiality measuring device according to claim 1, characterized in that: The base portion (31) is provided with a mounting hole (313), the mounting hole (313) being used to mount an oil injection piece (6), the mounting hole (313) being communicated with an oil inlet hole (314), an oil outlet hole being provided at the top end of the oil injection piece (6), the oil outlet hole being used to communicate with the oil inlet hole (314), a sealing groove being provided at the top end of the oil injection piece (6) next to the oil outlet hole, the sealing groove being used to arrange a second sealing ring (14) and to seal the connection surface between the oil injection piece (6) and the mounting hole (313) through the second sealing ring (14).

6. The elastic self-centering coaxiality measuring device according to claim 1, characterized in that: The first sealing member (8) is threadedly connected to the oil filling hole (61). A connecting screw hole is provided on the first sealing member (8). The connecting screw hole is used to set a set screw (13). The set screw (13) is used to push the piston member (7) to move when it is screwed into the connecting screw hole.

7. An elastic self-centering coaxiality measuring device according to claim 1 or 5, characterized in that: The piston member (7) comprises a piston rod, and the side wall of the piston rod is provided with annular sealing grooves at intervals. The annular sealing grooves are used to set a first sealing ring (12) and seal the gap between the piston rod and the inner wall of the oil storage chamber (62) through the first sealing ring (12).

8. The elastic self-centering coaxiality measuring device according to claim 1, characterized in that: The second end of the connecting shaft (1) passes through the limiting cylinder (32) and the base (31) in sequence and is connected to the rotating connecting rod (10) through a second connecting screw (17). The rotating connecting rod (10) is provided with a mounting through hole along its radial direction. The mounting through hole is used to set a handle (11) and drive the rotating connecting rod (10) and the connecting shaft (1) to rotate through the handle (11).

9. The elastic self-centering coaxiality measuring device according to claim 1, characterized in that: The side wall of the limiting cylinder (32) is a multi-section spliced ​​structure, and each section of the limiting cylinder (32) has a limiting hole in its side wall. A limiting rod is arranged in the side wall of the limiting cylinder (32), and the limiting rod is used to cooperate with the limiting hole in the side wall of each section of the limiting cylinder (32) to limit and guide the side wall of each section of the limiting cylinder (32).

10. The elastic self-centering coaxiality measuring device according to claim 9, characterized in that: A limiting screw hole is provided on the side wall of each section of the limiting cylinder (32), and the limiting screw hole is used to set a locking screw and cooperate with a preset through hole on the limiting rod through the locking screw, thereby locking and limiting the side wall of each section of the limiting cylinder (32) and the limiting rod.

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