Elastic self-centering coaxiality measuring device

Abstract

The application discloses a kind of elastic self-centering coaxiality measuring device, belong to aero-engine process equipment and manufacturing technical field, it includes table rod joint, table rod joint is arranged on connecting shaft, connecting shaft is connected with rotating connecting rod after being penetrated by clamping concrete;Clamping concrete includes base part and limiting cylinder part, expansion sleeve is used to be set in base part and is enclosed with the lateral wall of base part to form cavity liquid chamber;Oil injection piece is internally provided with oil storage cavity, piston piece is movably arranged in oil storage cavity, first sealing element is in oil injection hole, first sealing element is also used to be screwed into oil injection hole to push piston piece to compress hydraulic oil in oil storage cavity and push hydraulic oil into cavity liquid chamber by oil inlet hole and second oil passage, and then the lateral wall of expansion sleeve is radially extruded to make expansion sleeve compress the inner wall of measuring inclined hole.The application realizes the elastic expansion of the lateral wall of expansion sleeve by hydraulic oil to be more closely matched with the inclined hole to be measured, avoid the loosening or jumping phenomenon of measuring device, improve the accuracy of measurement.

Description

Technical Field

[0001] The present application relates to the field of aero-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 Figure 10 , Figure 10 This diagram shows the two oblique holes in the accessory receiver's oblique drive. The coaxiality of the φA and φB holes within the receiver needs to be measured. The large spacing between the two holes and their oblique orientation make measurement challenging. Previous coaxiality measurement fixtures used the φB hole as their positioning point. To facilitate placement, the coaxiality measurement fixture's positioning outer diameter and the φB hole within the receiver were fitted with a clearance fit, resulting in significant coaxiality errors between the φA and φB holes.

[0004] For measuring the coaxiality of inclined holes with large spacing like this, we provide a self-centering coaxiality measuring device that achieves stable and accurate clamping and positioning, avoids loosening or jumping of the measuring device, and is easy to disassemble and use, ensuring 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 this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this 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 for measuring the coaxiality of spaced inclined holes. The elastic self-centering coaxiality measuring device includes a connecting shaft, a gauge rod joint, a clamping body, an expansion sleeve, an oil injection piece, and a rotating connecting rod:

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

[0009] The clamp specifically comprises a base portion and a limiting cylinder portion, the limiting cylinder portion is arranged on the base portion, the expansion sleeve is used for sleeving the base portion and surrounding the side wall of the base portion to form a cavity liquid chamber, and the expansion sleeve is used for interference fit with the inner wall of one of the inclined holes to be measured.

[0010] The oil injection part is arranged at the bottom end of the base portion, an oil storage cavity is arranged in the oil injection part, a piston part is movably arranged in the oil storage cavity, the top of the oil storage cavity is communicated with the oil inlet hole, an oil injection hole is arranged at the bottom end of the oil injection part, the oil injection hole is communicated with the oil storage cavity and injects hydraulic oil into the oil storage cavity through the oil injection hole, the oil injection hole is used for arranging a first sealing part and sealing the oil injection hole through the first sealing part, and when the first sealing part is screwed into the oil injection hole, the piston part is pushed to compress the hydraulic oil in the oil storage cavity and push the hydraulic oil into the cavity liquid chamber through the oil inlet hole and the second oil passing hole, so that the side wall of the expansion sleeve is radially extruded to press the expansion sleeve against the inner wall of the inclined hole to be measured.

[0011] In some embodiments of the present application, a first arc-shaped groove is arranged on the side wall of the base portion, and a second arc-shaped groove is arranged on the inner wall of the expansion sleeve, the second arc-shaped groove is used for surrounding the first arc-shaped groove to form the cavity liquid chamber.

[0012] In some embodiments of the present application, the side wall of the first arc-shaped groove is used for abutting and limiting the expansion sleeve, and the side wall of the expansion sleeve does not protrude from the side wall of the base portion when the expansion sleeve is not matched 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 arranged on the base portion, the mounting hole is used for mounting the oil injection part, the mounting hole is communicated with the oil inlet hole, an oil outlet hole is arranged at the top end of the oil injection part, the oil outlet hole is used for being communicated with the oil inlet hole, a sealing groove is arranged beside the oil outlet hole at the top end of the oil injection part, and the sealing groove is used for arranging a second sealing ring and sealing the connecting surface of the oil injection part and the mounting hole through the second sealing ring.

[0015] In some embodiments of the present application, the first sealing part is threadedly connected with the oil injection hole, a connecting screw hole is arranged on the first sealing part, a clamping screw is arranged in the connecting screw hole, and the clamping screw is used for pushing the piston part to move when the clamping screw is screwed into the connecting screw hole.

[0016] In some embodiments of the present application, the piston piece comprises a piston rod, and a side wall of the piston rod is spaced apart to form an annular sealing groove, and the annular sealing groove is used to arrange a first sealing ring and seal a gap between the piston rod and an inner wall of the oil storage cavity 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 part and the base part in sequence and is connected with the rotating connecting rod through the second connecting screw, and the rotating connecting rod is provided with an installation through hole in the radial direction, and the installation through hole is used to arrange 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 part is a multi-section spliced structure, and a limiting hole is formed in each section of the side wall of the limiting cylinder part, and a limiting rod is arranged in the side wall of the limiting cylinder part, and the limiting rod is used to cooperate with the limiting hole in the side wall of each section of the limiting cylinder part to guide and limit each section of the side wall of the limiting cylinder part.

[0019] In some embodiments of the present application, a limiting screw hole is formed in each section of the side wall of the limiting cylinder part, and the limiting screw hole is used to arrange a locking screw and cooperate with a through hole prearranged on the limiting rod through the locking screw, so as to lock and limit each section of the side wall of the limiting cylinder part and the limiting rod.

[0020] The present application has the following beneficial effects:

[0021] The elastic self-centering coaxiality measuring device of the present application is used to fix and install measuring instruments such as a dial gauge through a staff joint, the staff joint is arranged on a connecting shaft, the connecting shaft penetrates through a clamping body and is connected with a rotating connecting rod, and the rotating connecting rod drives the connecting shaft and the measuring instrument to rotate for measurement; the clamping body comprises a limiting cylinder part and a base part, an expansion sleeve is arranged on the outer wall of the base part, and a cavity liquid chamber is formed between the expansion sleeve and the outer wall of the base part, an oil inlet hole is formed in the bottom end of the base part, the oil inlet hole is communicated with the cavity liquid chamber through a second oil passing hole in the side wall of the base part, an oil injection piece is arranged at the bottom end of the base part, and hydraulic oil is injected into the oil inlet hole and the cavity liquid chamber through the oil injection piece, so as to press the side wall of the expansion sleeve through the hydraulic oil to press the inner wall of the measured inclined hole and strengthen the stability of the connection between the expansion sleeve and the inclined hole, avoid loosening of the measuring device and other phenomena, and ensure the accuracy of the measurement.

[0022] The oil injection hole of the oil injection piece is sealed by a first sealing piece, the first sealing piece also pushes the piston piece in the oil storage cavity to move during screwing, so as to push the hydraulic oil in the oil storage cavity into the oil inlet hole and the cavity liquid chamber, and therefore the first sealing piece has multiple functions, can be conveniently operated and controlled by workers, is convenient for the limiting and fixing of the measuring device in the inclined hole and subsequent disassembly, and is beneficial to improve the operation efficiency of the measurement.

[0023] Of course, implementing any of the products of the present application does not necessarily require achieving all of the above-mentioned advantages at the same time. In addition to the above-described objects, features and advantages, the present application has other objects, features and advantages. The present application will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application by presenting illustrative embodiments of the present application and are not intended for limiting the present application. In the drawings:

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

[0026] Figure 2 is a schematic diagram of the installation of the oiling member 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 is a schematic diagram of the half-section of the preferred embodiment of the present application;

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

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

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

[0032] Figure 8 is a schematic diagram of the structure of the oiling member of the preferred embodiment of the present application;

[0033] Figure 9 is a schematic diagram of the internal structure of the oiling member of the preferred embodiment of the present application;

[0034] Figure 10 is a schematic diagram of the two inclined holes of the existing accessory case inclined transmission;

[0035] Legend: 1, connecting shaft; 2, dial rod joint; 3, clamping body; 31, base part; 32, limiting cylinder part; 311, pressure relief hole; 312, first oil passing hole; 313, mounting hole; 314, oil inlet hole; 315, second oil passing hole; 4, expansion sleeve; 5, first connecting screw; 6, oil injection part; 61, oil injection hole; 62, oil storage cavity; 63, mounting platform; 7, piston part; 8, first sealing part; 9, adjusting washer; 10, rotating connecting rod; 11, handle; 12, first sealing ring; 13, tightening screw; 14, second sealing ring; 15, second sealing part; 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 with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0037] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application; Figure 2 is a schematic diagram of the installation of the oil injection part 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 is a schematic diagram of the half-section of the preferred embodiment of the present application; Figure 5 is a schematic diagram of the bottom structure of the clamping body of the preferred embodiment of the present application; Figure 6 is a schematic diagram of the internal structure of the clamping body of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the installation of the handle of the preferred embodiment of the present application; Figure 8 is a schematic diagram of the structure of the oil injection part of the preferred embodiment of the present application; Figure 9 is a schematic diagram of the internal structure of the oil injection part of the preferred embodiment of the present application; Figure 10 is a schematic diagram of the two inclined holes of the existing accessory case inclined transmission.

[0038] An elastic self-centering coaxiality measuring device for measuring the coaxiality of two inclined holes arranged at intervals, the elastic self-centering coaxiality measuring device comprising a connecting shaft 1, a dial rod joint 2, a clamping body 3, an expansion sleeve 4, an oil injection part 6 and a rotating connecting rod 10:

[0039] The dial rod joint 2 is arranged at the first end of the connecting shaft 1, and the dial rod joint 2 is used for mounting a dial gauge; the second end of the connecting shaft 1 is used for penetrating the clamping body 3 and connecting with the rotating connecting rod 10, and the rotating connecting rod 10 is used for driving the connecting shaft 1 and the dial rod joint 2 to rotate;

[0040] The clamp body 3 comprises 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 for sleeving the base portion 31 and surrounding the side wall of the base portion 31 to form the cavity liquid chamber 18, the expansion sleeve 4 is also used for interference fit with the inner wall of one of the measured inclined holes, a plurality of pressure relief holes 311 are arranged at the bottom end of the base portion 31 in a spaced manner, a plurality of first oil passing holes 312 are arranged on the side wall of the base portion 31, each first oil passing hole 312 is in communication with each pressure relief hole 311, thereby the pressure relief hole 311 is in communication with the cavity liquid chamber 18, and each pressure relief hole 311 is sealed by the second sealing member 15; the base portion 31 is provided with an oil inlet hole 314 at the bottom end, and the base portion 31 is provided with a second oil passing hole 315 on the side wall, the second oil passing hole 315 is in communication with the oil inlet hole 314, thereby the oil inlet hole 314 is in communication with the cavity liquid chamber 18;

[0041] The oil injection member 6 is arranged at the bottom end of the base portion 31, the oil injection member 6 is internally provided with an oil storage cavity 62, the oil storage cavity 62 is movably provided with a piston member 7, the top of the oil storage cavity 62 is in communication with the oil inlet hole 314, the bottom end of the oil injection member 6 is provided with an oil injection hole 61, the oil injection hole 61 is in communication with the oil storage cavity 62 and injects hydraulic oil into the oil storage cavity 62 through the oil injection hole 61, the oil injection hole 61 is used for arranging the first sealing member 8 and sealing the oil injection hole 61 through the first sealing member 8, when the first sealing member 8 is screwed into the oil injection hole 61, the first sealing member 8 pushes the piston member 7 to compress the hydraulic oil in the oil storage cavity 62 and pushes the hydraulic oil into the cavity liquid chamber 18 through the oil inlet hole 314 and the second oil passing hole 315, thereby the side wall of the expansion sleeve 4 is radially extruded to press the expansion sleeve 4 against the inner wall of the measured inclined hole.

[0042] Here, the meaning of "expansion sleeve 4" refers to the structure connected with 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 respectively machined at both ends of the inner hole of the expansion sleeve 4 and the combined surface of the outer wall of the base portion 31, and the expansion sleeve 4 is assembled by welding after being sleeved on the outer wall of the base portion 31. Of course, the application also does not exclude the scheme that the expansion sleeve 4 is connected with the base portion 31 through bolts.

[0043] Here, the meaning of "second sealing member 15" refers to the part that seals the pressure relief hole 311, in some embodiments, the second sealing member 15 is a plunger screw.

[0044] It should be noted that the pressure relief hole 311 is preferably provided with three, and can constitute four corners of a quadrilateral with the oil inlet hole 314, that is, arranged in a ring array, so as to ensure the pressure balance of the cavity liquid chamber 18, and the hydraulic oil can be conveniently poured out quickly by opening the pressure relief hole 311.

[0045] The elastic self-centering coaxiality measuring device is used for fixing measuring instruments such as a dial gauge through a staff joint 2, the staff joint 2 is arranged on a connecting shaft 1, the connecting shaft 1 is connected with a rotating connecting rod 10 after penetrating through a clamping body 3, and the connecting shaft 1 and the measuring instruments are driven to rotate through the rotating connecting rod 10 to perform measurement; wherein the clamping body 3 comprises a limiting cylinder portion 32 and a base portion 31, an expansion sleeve 4 is sleeved on the outer wall of the base portion 31, and a cavity liquid chamber 18 is formed between the expansion sleeve 4 and the outer wall of the base portion 31, an oil inlet hole 314 is arranged at the bottom end of the base portion 31, the oil inlet hole 314 is communicated with the cavity liquid chamber 18 through a second oil passing hole 315 in the side wall of the base portion 31, an oil injection part 6 is arranged 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 part 6, so that the side wall of the expansion sleeve 4 is extruded by the hydraulic oil to press the inner wall of the inclined hole to be measured, the stability of the expansion sleeve 4 and the inclined hole is strengthened, the loosening of the measuring device is avoided, and the measurement accuracy is ensured.

[0046] The oil injection hole 61 of the oil injection part 6 is sealed by the first sealing part 8, the first sealing part 8 also pushes the piston part 7 in the oil storage cavity 62 to move in the process of being screwed, so that the hydraulic oil in the oil storage cavity 62 is pushed into the oil inlet hole 314 and the cavity liquid chamber 18, and therefore the first sealing part 8 has multiple functions, can be conveniently operated and controlled by workers, is convenient for limiting and fixing the measuring device in the inclined hole, and is convenient for subsequent disassembly, and is beneficial to improving the operation efficiency of measurement.

[0047] Preferably, as shown in Figure 3 , 4 A circle of first arc-shaped grooves is arranged on the side wall of the base portion 31, and a circle of second arc-shaped grooves is arranged on the inner wall of the expansion sleeve 4, and the second arc-shaped grooves are used to form the cavity liquid chamber 18 together with the first arc-shaped grooves.

[0048] It can be understood that the first arc-shaped grooves on the side wall of the base portion 31 can limit the expansion sleeve 4, facilitate installation of the expansion sleeve 4, and cooperate with the second arc-shaped grooves arranged on the inner wall of the inner hole of the expansion sleeve 4 to form a circle of cavity liquid chambers 18, and the second arc-shaped grooves are arranged to make the side wall of the expansion sleeve 4 have a circle of thin-walled parts, so as to improve the elastic performance, so that the hydraulic oil can extrude the expansion sleeve 4 to smoothly perform radial elastic displacement, and then press the inner wall of the inclined hole to be measured, and the measuring device is more stably limited and fixed.

[0049] Preferably, as shown in Figure 2 The side wall of the first arc-shaped groove is used to abut and limit the 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 the expansion sleeve 4 is not matched with the inclined hole.

[0050] It can be understood that, in order to make the base 31 and the expansion sleeve 4 be inserted into the inclined hole to be measured smoothly, the side wall of the expansion sleeve 4 should not protrude from the side wall of the base 31, so as to avoid jamming at the expansion sleeve 4 during installation. Therefore, the first arc-shaped groove is provided for the installation of the expansion sleeve 4, and the side wall of the first arc-shaped groove can limit the axial movement of the expansion sleeve 4 during the insertion into the inclined hole, so as to reduce the axial deviation of the expansion sleeve 4 and ensure the 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 can be understood that, in order to ensure that the elasticity of the expansion sleeve 4 and the side wall of the second arc-shaped groove is in the best state, the expansion sleeve 4 is preferably made of 60Si2Mn spring steel, and after rough machining of the expansion sleeve 4, heat treatment is performed to the best hardness range of 44-48HRC.

[0053] Preferably, please refer to Figure 2 、 5 , 6, 7, the base 31 is provided with a mounting hole 313, the mounting hole 313 is used for mounting an oil injection part 6, the mounting hole 313 is communicated with an oil inlet hole 314, the top end of the oil injection part 6 is provided with an oil outlet hole, the oil outlet hole is used for communication with the oil inlet hole 314, the top end of the oil injection part 6 is provided with a sealing groove beside the oil outlet hole, the sealing groove is used for setting a second sealing ring 14 and sealing the connecting surface between the oil injection part 6 and the mounting hole 313 through the second sealing ring 14.

[0054] It can be understood that the oil injection part 6 is limited and installed through the mounting hole 313, which can ensure the installation stability of the oil injection part 6, and can also form a sealing surface between the side wall of the mounting hole 313 and the side wall of the oil injection part 6, and form a connecting surface between the bottom of the mounting hole 313 and the contact surface of the oil injection part 6, and cooperate with the second sealing ring 14 to seal the connecting surface, so as to realize a longer sealing area and prevent the hydraulic oil from leaking.

[0055] It should be noted that the oil injection part 6 is provided with a mounting platform 63, the mounting platform 63 is provided with a first mounting screw hole, the first mounting screw hole is used for setting a first connecting screw 5 and cooperating with a second mounting screw hole pre-set on the base 31, so as to connect and fasten the mounting platform 63 and the base 31.

[0056] Preferably, please refer to Figure 3 、 4 , the first sealing part 8 is threadedly connected with the oil injection hole 61, the first sealing part 8 is provided with a connecting screw hole, the connecting screw hole is used for setting a clamping screw 13, the clamping screw 13 is used for pushing the piston part 7 to move when being screwed into the connecting screw hole.

[0057] It can be understood that the adjusting screw 13 can play a role in extending the length of the first sealing member 8. After the oil injection hole 61 is sealed by the first sealing member 8, if it is necessary to push the piston member 7 for a longer distance, the adjusting screw 13 can be adjusted to abut against the piston member 7 to continuously push the piston member 7, so that the hydraulic oil in the oil storage cavity 62 is pushed into the cavity liquid chamber 18, thereby realizing stable sealing of the oil injection hole 61 and adjustment of the pressure of the cavity liquid chamber 18. The operation is very convenient, and the structure of the first sealing member 8 and the adjusting screw 13 is very simple, which realizes multiple functions and is convenient for workers to operate and disassemble and maintain.

[0058] Preferably, as shown in Figure 3 , 4 , the piston member 7 comprises a piston rod, and an annular sealing groove is arranged in the side wall of the piston rod in a spaced manner. The annular sealing groove is used to arrange the first sealing ring 12 and seal the gap between the piston rod and the inner wall of the oil storage cavity 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 cavity 62 into the cavity liquid chamber 18, the sealing between the piston rod and the inner wall of the oil storage cavity 62 is strengthened through the first sealing ring 12, the leakage of the gap between the piston rod and the oil storage cavity 62 is reduced, the piston rod can accurately control the pressure of the hydraulic oil in the cavity liquid chamber 18, and then the elastic expansion displacement of the side wall of the expansion sleeve 4 is adjusted, so that the measuring device is stably and fixedly positioned in the inclined hole to be measured, and the pressure in the cavity liquid chamber 18 is lowered for the disassembly of the measuring device.

[0060] Preferably, as shown in Figure 3 , 4 , the second end of the connecting shaft 1 passes through the limiting cylinder portion 32 and the base portion 31 in sequence and is connected with the rotating connecting rod 10 through the second connecting screw 17. The rotating connecting rod 10 is provided with a mounting through hole in the radial direction thereof. The mounting through hole is used to arrange 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 with the rotating connecting rod 10 through the second connecting screw 17. The connecting shaft 1, the rod joint 2 and the measuring instrument can be synchronously rotated to complete the measurement through the rotating connecting rod 10. The mounting through hole on the rotating connecting rod 10 can conveniently insert and install the handle 11, so that the worker can drive the rotating connecting rod 10 to rotate through the handle 11, which is beneficial to improve the convenience of operation.

[0062] It should be noted that the rotating connecting rod 10 is provided with a middle counterbore, and the bottom of the middle counterbore is provided with a first screw hole for communicating with a second screw hole provided on the connecting shaft 1. 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 and the connecting shaft 1, and the second connecting screw 17 can be conveniently disassembled through the middle counterbore. Meanwhile, the rotating connecting rod 10 and the connecting shaft 1 are reinforced and limited by the positioning pin 16 to improve the accuracy of rotation control; and the contact surface of the rotating connecting rod 10 and the base portion 31 can be provided with the adjusting washer 9 to play a limiting and protecting role.

[0063] Preferably, the side wall of the limiting cylinder portion 32 is a multi-section spliced structure, and a limiting hole is provided in the side wall of each section of the limiting cylinder portion 32. A limiting rod is arranged in the side wall of the limiting cylinder portion 32, and the limiting rod is used to cooperate with the limiting hole in the side wall of each section of the limiting cylinder portion 32 to limit and guide the side wall of each section of the limiting cylinder portion 32.

[0064] It can be understood that the multi-section spliced structure of the side wall of the limiting cylinder portion 32 can realize the adjustment of the length of the limiting cylinder portion 32 as a whole, so as to adapt to the coaxiality measurement between inclined holes with different distances, and is beneficial to improve the adaptability of the measuring device.

[0065] Specifically, a limiting screw hole is provided in the side wall of each section of the limiting cylinder portion 32, and the limiting screw hole is used to arrange a locking screw and cooperate with a through hole provided on the limiting rod by the locking screw, so as to lock and limit the side wall of each section of the limiting cylinder portion 32 and the limiting rod.

[0066] It can be understood that when the length adjustment of the limiting cylinder portion 32 is completed, the locking screw can be screwed into the limiting screw hole and the through hole on the limiting rod in sequence to complete the locking and limiting of the side wall of each section of the limiting cylinder portion 32, which is very simple to operate and effectively expands the function of the limiting cylinder portion 32.

[0067] It should be noted that in this document, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices.

[0068] The principles and implementations of the present application are described herein with specific examples. The above examples are only used to help understand the method and its core idea of the present application. The above description is only the preferred embodiments of the present application. It should be pointed out that due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner. The improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other fields without improvement, shall be regarded as the protection of the present application.

Claims

1. An elastic self-centering coaxiality measuring device for measuring coaxiality of angularly spaced holes, characterized by, The elastic self-centering coaxiality measuring device comprises a connecting shaft (1), a dial bar joint (2), a clamping body (3), an expansion sleeve (4), an oil injection part (6) and a rotating connecting rod (10): The dial bar joint (2) is arranged at the first end of the connecting shaft (1), and the dial bar joint (2) is used for installing a dial gauge; the second end of the connecting shaft (1) is used for penetrating through the clamping body (3) and then being connected with the rotating connecting rod (10), and the rotating connecting rod (10) is used for driving the connecting shaft (1) and the dial bar joint (2) to rotate; The clamping body (3) comprises 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 for being sleeved on the base portion (31) and surrounding the side wall of the base portion (31) to form a cavity liquid chamber (18), the expansion sleeve (4) is also used for being in interference fit with the inner wall of one of the inclined holes to be measured, a plurality of pressure relief holes (311) are arranged at the bottom end of the base portion (31) in a spaced manner, a plurality of first oil passing holes (312) are arranged on the side wall of the base portion (31), each first oil passing hole (312) is in communication with each pressure relief hole (311), thereby the pressure relief hole (311) is in communication with the cavity liquid chamber (18), and each pressure relief hole (311) is sealed by a second sealing part (15); an oil inlet hole (314) is arranged at the bottom end of the base portion (31), a second oil passing hole (315) is arranged on the side wall of the base portion (31), the second oil passing hole (315) is in communication with the oil inlet hole (314), thereby the oil inlet hole (314) is in communication with the cavity liquid chamber (18); The oil injection part (6) is arranged at the bottom end of the base portion (31), an oil storage cavity (62) is arranged in the oil injection part (6), a piston part (7) is movably arranged in the oil storage cavity (62), the top of the oil storage cavity (62) is in communication with the oil inlet hole (314), an oil injection hole (61) is arranged at the bottom end of the oil injection part (6), the oil injection hole (61) is in communication with the oil storage cavity (62) and injects hydraulic oil into the oil storage cavity (62) through the oil injection hole (61), the oil injection hole (61) is used for arranging a first sealing part (8) and sealing the oil injection hole (61) by the first sealing part (8), when the first sealing part (8) is screwed into the oil injection hole (61), the first sealing part (8) pushes the piston part (7) to compress the hydraulic oil in the oil storage cavity (62) and pushes the hydraulic oil into the cavity liquid chamber (18) through the oil inlet hole (314) and the second oil passing hole (315), thereby the side wall of the expansion sleeve (4) is radially extruded to press the expansion sleeve (4) against the inner wall of the inclined hole to be measured; An installation hole (313) is arranged on the base portion (31), the installation hole (313) is used for installing the oil injection part (6), the installation hole (313) is in communication with the oil inlet hole (314), an oil outlet hole is arranged at the top end of the oil injection part (6), the oil outlet hole is used for being in communication with the oil inlet hole (314), a sealing groove is arranged beside the oil outlet hole at the top end of the oil injection part (6), the sealing groove is used for arranging a second sealing ring (14) and sealing the connecting surface of the oil injection part (6) and the installation hole (313) by the second sealing ring (14); The first sealing member (8) is threadedly connected with the oil injection hole (61), the first sealing member (8) is provided with a connecting screw hole, the connecting screw hole is used for arranging a clamping screw (13), and the clamping screw (13) is used for pushing the piston member (7) to move when being screwed into the connecting screw hole; The side wall of the limiting cylinder portion (32) is a multi-section spliced structure, and a limiting hole is arranged in the side wall of each section of the limiting cylinder portion (32); and a limiting rod is arranged in the side wall of the limiting cylinder portion (32), and the limiting rod is used for cooperating with the limiting hole in the side wall of each section of the limiting cylinder portion (32) to guide and limit the side wall of each section of the limiting cylinder portion (32).

2. A resilient self-centering coaxiality measuring device according to claim 1, characterized in that The side wall of the base portion (31) is provided with a first arc-shaped groove, and the inner wall of the expansion sleeve (4) is provided with a second arc-shaped groove, and the second arc-shaped groove is used for surrounding the first arc-shaped groove to form a cavity liquid chamber (18).

3. A resilient self-centering coaxiality measuring device according to claim 2, characterized in that The side wall of the first arc-shaped groove is used for abutting against the limiting expansion sleeve (4), and the side wall of the expansion sleeve (4) is not protruded from the side wall of the base portion (31) when not cooperating with the inclined hole.

4. A resilient self-centering coaxiality measuring device according to any one of claims 1-3, 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 resilient self-centering coaxiality measuring device according to claim 1, characterized in that The piston member (7) comprises a piston rod, and the side wall of the piston rod is provided with a ring-shaped sealing groove at intervals, the ring-shaped sealing groove is used for arranging a first sealing ring (12) and sealing the gap between the piston rod and the inner wall of the oil storage cavity (62) through the first sealing ring (12).

6. A resilient 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 portion (32) and the base portion (31) in sequence and is connected with the rotating connecting rod (10) through the second connecting screw (17), the rotating connecting rod (10) is provided with a mounting through hole in the radial direction, and the mounting through hole is used for arranging a handle (11) and rotating the rotating connecting rod (10) and the connecting shaft (1) through the handle (11).

7. A resilient self-centering coaxiality measuring device according to claim 6, characterized in that The side wall of each section of the limiting cylinder portion (32) is provided with a limiting screw hole, the limiting screw hole is used for arranging a locking screw and cooperating with a through hole arranged on the limiting rod, so as to lock and limit the side wall of each section of the limiting cylinder portion (32) and the limiting rod.

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