Coaxiality measuring device

Abstract

The utility model provides a coaxiality measuring device for measuring the coaxiality of a step pin, the step pin comprises a first diameter part and a second diameter part, the coaxiality measuring device comprises a bearing jig, the upper end face of the bearing jig is provided with a first through groove and a second through groove which are coaxial and communicated, and the first through groove and the second through groove are communicated with each other. The first diameter part of the step pin is arranged in the first through groove, and the second diameter part of the step pin is arranged in the second through groove; and the measuring assembly is provided with a plurality of measuring heads, the plurality of measuring heads are at least arranged in the second through groove so as to measure the distance between the second diameter part and the groove wall of the second through groove, and the measuring assembly calculates the coaxiality of the step pin according to the distance values measured by the plurality of measuring heads. Therefore, operation is convenient, time and labor are saved, measurement precision is high, cost is low, and measurement efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor system, in particular to a coaxiality measuring device. BACKGROUND

[0002] The stepped pin is composed of a large diameter part and a small diameter part arranged in the axial direction. After the stepped pin product is processed, the coaxiality of the large diameter part and the small diameter part needs to be measured to ensure that the coaxiality specification of the stepped pin product is within a reasonable range. In the prior art, a roundness instrument is usually used to measure the coaxiality of the stepped pin. Although the measurement accuracy of the roundness instrument is high, the roundness instrument is expensive and the measurement time is long, which is not conducive to cost saving and production efficiency improvement. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a coaxiality measuring device which is convenient to operate, low in cost and high in measurement efficiency.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme:

[0005] A coaxiality measuring device for measuring the coaxiality of a stepped pin, the stepped pin comprising a first diameter part and a second diameter part, the coaxiality measuring device comprising:

[0006] A carrying jig, an upper end surface of the carrying jig being provided with a coaxial and communicating first through slot and a second through slot, the first diameter part of the stepped pin being placed in the first through slot, and the second diameter part of the stepped pin being placed in the second through slot;

[0007] A measuring assembly, the measuring assembly having a plurality of measuring heads, the plurality of measuring heads being arranged at least in the second through slot to measure the distance between the second diameter part and the slot wall of the second through slot, and the measuring assembly calculating the coaxiality of the stepped pin according to the distance values measured by the plurality of measuring heads.

[0008] Optionally, the slot bottom of the first through slot of the carrying jig is provided with two support inclined surfaces with the same inclination angle relative to the slot wall, the two support inclined surfaces being used to abut against the first diameter part of the stepped pin to keep the central axis of the first diameter part on the central surface of the first through slot, and the second diameter part of the stepped pin is suspended in the second through slot.

[0009] Optionally, the measuring assembly further has a control box, the control box being in communication connection with the plurality of measuring heads to calculate the coaxiality of the stepped pin according to the distance values measured by the plurality of measuring heads.

[0010] Optionally, the measuring assembly comprises a pneumatic measuring instrument in communication connection with the control box, and the plurality of measuring heads are pneumatic measuring heads of the pneumatic measuring instrument, and the plurality of measuring heads comprise:

[0011] two first measuring heads in communication with the same pneumatic channel of the control box and symmetrically arranged on two groove walls of the second groove;

[0012] one second measuring head in one-to-one communication with the pneumatic channel of the control box;

[0013] wherein the second measuring head is provided with one and arranged on one of the groove walls of the second groove, or the second measuring head is provided with two and symmetrically arranged on two groove walls of the second groove.

[0014] Optionally, the plurality of measuring heads further comprise:

[0015] two third measuring heads in communication with the same pneumatic channel of the control box and symmetrically arranged on two groove walls of the first groove;

[0016] one fourth measuring head in one-to-one communication with the pneumatic channel of the control box;

[0017] wherein the fourth measuring head is provided with one and arranged on one of the groove walls of the first groove, or the fourth measuring head is provided with two and symmetrically arranged on two groove walls of the first groove.

[0018] Optionally, the control box is provided with a display screen for displaying measurement data.

[0019] Optionally, the first diameter part has a smaller diameter than the second diameter part, and the first groove has a smaller groove width than the second groove.

[0020] Optionally, the carrying jig is provided with a blocking structure at an end of the second groove away from the first groove for axially limiting the stepped pin.

[0021] Optionally, the blocking structure comprises:

[0022] a blocking seat arranged on the carrying jig;

[0023] a blocking screw screwed on the blocking seat and extending along the axial direction of the second groove.

[0024] Optionally, further comprising:

[0025] The rotating assembly has a roller capable of approaching and moving away from the first through slot, and the roller is used to abut against the first diameter part to drive the first diameter part to rotate in the first through slot.

[0026] Optionally, the rotating assembly comprises:

[0027] A fixed seat and a swing rod, one end of the swing rod is rotatably connected to the fixed seat, and the other end of the swing rod is provided with the roller;

[0028] A driving member is arranged on the swing rod and drives the roller to rotate;

[0029] Wherein, a limiting structure is arranged between the fixed seat and the swing rod, and is used to limit the swing rod from swinging towards the first through slot.

[0030] Optionally, the limiting structure comprises:

[0031] A limiting seat is arranged on the fixed seat;

[0032] A limiting screw is screwed on the limiting seat and extends towards the swing rod.

[0033] The coaxiality measuring device provided by the application, when measuring, the first diameter part of the stepped pin abuts against two support inclined surfaces at the same time, so that the central axis of the first diameter part is on the central surface of the first through slot, the distance between the first diameter part and the first groove wall of the first through slot is equal to the distance between the first diameter part and the second groove wall of the first through slot, at this time, the second diameter part is suspended in the second through slot, by measuring the distance between the second diameter part and the third groove wall of the second through slot and the fourth groove wall of the second through slot, the coaxiality of the first diameter part and the second diameter part can be calculated. The first diameter part of the stepped pin is driven to rotate in the first through slot manually or through a mechanical structure, at the same time, the second diameter part is suspended and rotates in the second through slot, the control box records a group of data and obtains a coaxiality when the stepped pin rotates by one angle, a plurality of coaxialities are obtained at different angles, and finally the maximum value in the plurality of coaxialities is taken as the final measurement result. In this way, by measuring the slight change of the distance between the outer circumferential surface of the stepped pin and the groove wall, the positions of the centers of the sections are calculated by using the change value, and the coaxiality result is obtained through digital processing of the control box, so that the operation is simple, time and labor are saved, the measurement accuracy is high, the cost is low, and the measurement efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0035] Figure 1 A perspective view of a coaxiality measuring device shown in accordance with some embodiments of the present application Figure One ;

[0036] Figure 2 A perspective view of a coaxiality measuring device shown in accordance with some embodiments of the present application Figure Two ;

[0037] Figure 3 A perspective view of a carrier jig shown in accordance with some embodiments of the present application Figure One ;

[0038] Figure 4 A perspective view of a carrier jig shown in accordance with some embodiments of the present application Figure Two ;

[0039] Figure 5 A sectional view of a first probe position of a carrier jig shown in accordance with some embodiments of the present application

[0040] Figure 6 A sectional view of a third probe position of a carrier jig shown in accordance with some embodiments of the present application

[0041] Figure 7 A perspective view of a stepped pin shown in accordance with some embodiments of the present application.

[0042] In the drawings:

[0043] 1, carrier jig; 2, carrier seat; 3, bottom plate; 4, foot; 5, fixed seat; 6, swing lever; 7, roller; 8, driving member; 9, handle; 10, limiting seat; 11, limiting screw; 12, blocking seat; 13, first through slot; 14, second through slot; 15, supporting inclined surface;

[0044] 101, first probe; 102, second probe; 103, third probe; 104, fourth probe; 105, first air blowing hole; 106, third air blowing hole;

[0045] 200, stepped pin; 201, first diameter part; 202, second diameter part. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] AsFigures 1-7 As shown in the drawings, the embodiment of the present application provides a coaxiality measuring device for measuring the coaxiality of the stepped pin 200. The coaxiality measuring device comprises a bearing jig 1 and a measuring assembly. The bearing jig 1 and the measuring assembly are both arranged on an operation table, the operation table comprises a bottom plate 3 and a plurality of footings 4 arranged below the bottom plate 3, the plurality of footings 4 are in contact with the ground to support the bottom plate 3, and the bearing jig 1 and the measuring assembly are both fixed above the bottom plate 3 to fix the positions of the bearing jig 1 and the measuring assembly, so as to ensure the accuracy of measurement. For example, a bearing seat 2 is arranged above the bottom plate 3, and the bearing jig 1 is fixed above the bearing seat 2.

[0048] The stepped pin 200 has a first diameter part 201 and a second diameter part 202 arranged in the axial direction, and the diameter of the first diameter part 201 is different from the diameter of the second diameter part 202. Here, as shown in the drawings, the diameter of the first diameter part 201 is taken as an example for description, which is smaller than the diameter of the second diameter part 202. Figure 7

[0049] The bearing jig 1 is arranged in a square structure, and the upper end surface of the bearing jig 1 is provided with a first through groove 13 and a second through groove 14, one end of the first through groove 13 and one end of the second through groove 14 are close to and communicate with each other, and the first through groove 13 and the second through groove 14 extend along the same axis, so as to accommodate the first diameter part 201 of the stepped pin 200 through the first through groove 13 and accommodate the second diameter part 202 of the stepped pin 200 through the second through groove 14. Among them, the first through groove 13 has a first groove wall and a second groove wall which are opposite and parallel, and the second through groove 14 has a third groove wall and a fourth groove wall which are opposite and parallel. Specifically, the first groove wall, the second groove wall, the third groove wall and the fourth groove wall all keep parallel, the distance between the first groove wall and the second groove wall (i.e. the groove width of the first through groove 13) is smaller than the distance between the third groove wall and the fourth groove wall (i.e. the groove width of the second through groove 14), and the distance between the first groove wall and the third groove wall is equal to the distance between the second groove wall and the fourth groove wall.

[0050] In a specific scheme, the bearing jig 1 can be an integral structure or a split structure. For example, the bearing jig 1 is composed of two parts, the upper end surface of one part is provided with the first through groove 13, and the upper end surface of the other part is provided with the second through groove 14, and the first through groove 13 and the second through groove 14 are connected by the butt joint of the two parts, so as to facilitate the overall machining of the first through groove 13 and the second through groove 14.

[0051] ​The groove bottom of the first through groove 13 is provided with two support inclined surfaces 15, namely a first support inclined surface and a second support inclined surface, the first support inclined surface is close to and connected with the first groove wall, the second support inclined surface is close to and connected with the second groove wall, and the included angle formed by the first support inclined surface and the first groove wall is equal to the included angle formed by the second support inclined surface and the second groove wall. Specifically, the first support inclined surface is connected with the second support inclined surface, so that the cross section of the groove bottom of the first through groove 13 is V-shaped, that is, the first through groove 13 forms a V-shaped groove. Moreover, the groove bottom of the second through groove 14 is lower than the two support inclined surfaces 15, for example, the cross section of the second through groove 14 is U-shaped.

[0052] During measurement, the first diameter part 201 of the stepped pin 200 simultaneously abuts against the two support inclined surfaces 15, so that the central axis of the first diameter part 201 is on the central plane of the first through groove 13 (the central plane is a plane passing through the extension axis of the first through groove 13 and equidistant from the first groove wall and the second groove wall), the distance between the first diameter part 201 and the first groove wall is equal to the distance between the first diameter part 201 and the second groove wall, at this time, the second diameter part 202 is suspended in the second through groove 14, and the coaxiality of the first diameter part 201 and the second diameter part 202 can be calculated by measuring the distance between the second diameter part 202 and the third groove wall and the fourth groove wall.

[0053] The side of the bearing jig 1 is provided with a blocking seat 12 and a blocking screw to form a blocking structure. The blocking seat 12 is connected to the bearing jig 1 and located at one end of the second through groove 14 away from the first through groove 13. Specifically, the blocking seat 12 is provided in the form of a plate and can block the port of the second through groove 14. The blocking screw penetrates and is screwed on the blocking seat 12, the extension direction of the blocking screw is consistent with the extension direction of the second through groove 14, and the blocking screw can move in the axial direction of the second through groove 14 by rotating the blocking screw. By adjusting the blocking screw to a suitable axial position, one end of the stepped pin 200 can abut against the blocking screw, and the axial position of the stepped pin 200 is limited by the blocking screw, so that the axial position of the stepped pin 200 remains unchanged during measurement, thereby improving the measurement accuracy.

[0054] In the scheme, the measurement assembly includes a control box (not shown in the figure) and a plurality of measurement heads, the plurality of measurement heads are used to measure the distance between the groove wall of the second through groove 14 and the second diameter part 202, the control box is in communication connection with the plurality of measurement heads, and is used to calculate the coaxiality of the stepped pin 200 according to the measurement values of the plurality of measurement heads. The measurement head can be provided as a pneumatic probe of a pneumatic measuring instrument, or can be provided as a probe of other measuring instruments. Here, the measurement head is taken as an example to be provided as a pneumatic probe of a pneumatic measuring instrument for description.

[0055] The control box is provided with a display screen, and the measurement results can be displayed through the display screen, which can include the diameter of the first diameter part 201, the diameter of the second diameter part 202, the coaxiality of the first diameter part 201 and the second diameter part 202, and the like. The pneumatic measuring instrument is arranged in the control box, and the pneumatic measuring instrument communicates with the plurality of measuring heads through a plurality of pneumatic channels arranged on the control box to transmit pneumatic signals, and then the measurement values of the measuring heads are obtained.

[0056] The plurality of measuring heads include a first measuring head 101, a second measuring head 102, a third measuring head 103, and a fourth measuring head 104. The first measuring head 101 and the second measuring head 102 are arranged at two different axial positions of the second through groove 14, and the third measuring head 103 and the fourth measuring head 104 are arranged at two different axial positions of the first through groove 13.

[0057] Among them, the first measuring head 101 is provided with two and is symmetrically arranged on the third groove wall and the fourth groove wall of the second through groove 14. Specifically, the third groove wall and the fourth groove wall are symmetrically provided with two first air blowing holes 105, and the first measuring head 101 communicates with the first air blowing hole 105 to blow air towards the second diameter part 202 through the first air blowing hole 105. Moreover, the two first measuring heads 101 communicate with the same pneumatic channel of the control box. During measurement, the two first measuring heads 101 are respectively located on both sides of the second diameter part 202 and blow air towards the second diameter part 202, and then the diameter D2 of the second diameter part 202 is obtained according to the working principle of the pneumatic measuring instrument and the measured groove width W2 of the second through groove 14.

[0058] In one scheme, the second measuring head 102 is provided with one and is arranged on the third groove wall or the fourth groove wall of the second through groove 14. Specifically, the third groove wall or the fourth groove wall is provided with a second air blowing hole (not shown in the figure), and the second measuring head 102 communicates with the second air blowing hole to blow air towards the second diameter part 202 through the second air blowing hole. Moreover, the second measuring head 102 communicates with one pneumatic channel of the control box, and during measurement, the second measuring head 102 is located on one side of the second diameter part 202 and blows air towards the second diameter part 202, and then the distance a2 between the second diameter part 202 and the third groove wall or the distance b2 between the second diameter part 202 and the fourth groove wall is measured. During the measurement process, the standard part of the stepped pin 200 needs to be put into the first through groove 13 and the second through groove 14 first, and wait for a few seconds, so that the coaxiality measuring device measures the initial distance a20 or b20 of the standard part in a stable state, and calculates the coaxiality e of the second diameter part 202 = 2*|a2-a20| or e = 2*|b2-b20|.

[0059] In another solution, two second probes 102 are symmetrically arranged on the third and fourth slot walls of the second slot 14. Specifically, two second air blowing holes are symmetrically arranged on the third and fourth slot walls, and the second probes 102 are connected to the second air blowing holes to blow air towards the second diameter part 202 through the second air blowing holes. Moreover, the two second probes 102 are one-to-one connected to two pneumatic channels of the control box. During measurement, the two second probes 102 are respectively arranged on two sides of the second diameter part 202 and blow air towards the second diameter part 202, so as to measure the distance a2 between the second diameter part 202 and the third slot wall and the distance b2 between the second diameter part 202 and the fourth slot wall, and calculate the coaxiality e of the second diameter part 202, i.e. e = |a2-b2|.

[0060] Similarly, the third probe 103 is used to measure the diameter of the first diameter part 201, and the fourth probe 104 is used to measure the offset of the first diameter part 201 relative to the center surface of the first slot 13, so as to participate in the calculation of the coaxiality of the first diameter part 201 and the second diameter part 202 as error compensation. The third probe 103 and the fourth probe 104 will be described below. The third probe 103 is arranged in two and symmetrically arranged on the first and second slot walls of the first slot 13. Specifically, two third air blowing holes 106 are symmetrically arranged on the first and second slot walls, and the third probe 103 is connected to the third air blowing holes 106 to blow air towards the first diameter part 201 through the third air blowing holes 106. Moreover, the two third probes 103 are connected to the same pneumatic channel of the control box. During measurement, the two third probes 103 are respectively arranged on two sides of the first diameter part 201 and blow air towards the first diameter part 201, so as to obtain the diameter D1 of the second diameter part 202 according to the working principle of the pneumatic measuring instrument and the measured slot width W1 of the first slot 13.

[0061] In one solution, the fourth probe 104 is provided with one and arranged on the first slot wall or the second slot wall of the first through slot 13. Specifically, the fourth probe 104 is communicated with a fourth air blowing hole (not shown in the figure) arranged on the first slot wall or the second slot wall, so as to blow air towards the first diameter part 201 through the fourth air blowing hole. Moreover, the fourth probe 104 is communicated with one pneumatic channel of the control box, and during measurement, the fourth probe 104 is arranged on one side of the first diameter part 201 and blows air towards the first diameter part 201, so as to measure the distance a1 between the first diameter part 201 and the first slot wall or the distance b1 between the first diameter part 201 and the second slot wall. During measurement, the stepped pin 200 standard part needs to be firstly arranged in the first through slot 13 and the second through slot 14, and then wait for several seconds, so that the coaxiality measuring device measures the initial distance a10 or b10 of the standard part in a stable state, and calculates the offset c = |a1-a10| or c1 = |b1-b10| of the first diameter part 201 relative to the center surface of the first through slot 13. In another solution, the fourth probe 104 is provided with two and symmetrically arranged on the first slot wall and the second slot wall of the first through slot 13. Specifically, the fourth probe 104 is communicated with two fourth air blowing holes symmetrically arranged on the first slot wall and the second slot wall, so as to blow air towards the first diameter part 201 through the fourth air blowing hole. Moreover, the two fourth probes 104 are one-to-one communicated with two pneumatic channels of the control box, and during measurement, the two fourth probes 104 are respectively arranged on two sides of the first diameter part 201 and blow air towards the first diameter part 201, so as to measure the distance a1 between the first diameter part 201 and the first slot wall and the distance b1 between the first diameter part 201 and the second slot wall, and then calculate the offset c = 1 / 2|a1-b1| of the first diameter part 201 relative to the center surface of the first through slot 13.

[0062] In combination with the above solutions, according to the diameter D1 of the first diameter part 201 and the diameter D2 of the second diameter part 202, the sizes of a1 relative to a10 or b1 relative to b10, and the sizes of a2 relative to a20 or b2 relative to b20 are determined, and then the offset directions of the first diameter part 201 and the second diameter part 202 relative to the center surface of the first through slot 13 (the second through slot 14) are determined. When the offset directions of the two are opposite, the final coaxiality result is the sum of the above coaxiality e and twice the offset c1 or c. When the offset directions of the two are the same, the final coaxiality result is the difference between the above coaxiality e and twice the offset c1 or c.

[0063] It should be noted that the extending directions of the first air blowing hole 105, the second air blowing hole, the third air blowing hole 106 and the fourth air blowing hole are all perpendicular to the center surface of the first through slot 13, and during measurement, the first air blowing hole 105, the second air blowing hole, the third air blowing hole 106 and the fourth air blowing hole are all towards the central axis of the stepped pin 200.

[0064] In the measurement process, first, the standard parts of the stepped pin 200 are placed in the first through slot 13 and the second through slot 14, and the verification is performed by the two first measuring heads 101 and the two second measuring heads 102. If the verification result does not meet the standard, the magnification of the pneumatic measuring instrument is adjusted, and the verification is re-performed. If the verification result meets the standard, the measured parts of the stepped pin 200 are placed in the first through slot 13 and the second through slot 14. The first diameter part 201 of the measured part abuts against the two supporting inclined surfaces 15, and the first diameter part 201 of the measured part is manually or by a mechanical structure driven to rotate in the first through slot 13, while the second diameter part 202 is suspended and rotates in the second through slot 14. The control box records a set of data and obtains a coaxiality for each rotation angle of the measured part. For example, after the measured part rotates 180 degrees, the control box records 30 sets of data and obtains 30 coaxialities, and finally the maximum value of the 30 coaxialities is taken as the final measurement result.

[0065] In some embodiments, the coaxiality measuring device further comprises a rotating assembly. In addition to manually rotating the measured part, the rotating assembly can also be used to drive the measured part to rotate. The rotating assembly comprises a fixed seat 5, a swing rod 6, a driving part 8 and a roller 7. The fixed seat 5 is in the shape of a strip-shaped plate and is vertically connected above the bottom plate 3. The first axial position of the swing rod 6 is hingedly connected to one end of the fixed seat 5 away from the bottom plate 3. The second axial position of the swing rod 6 is fixed with the driving part 8. The third axial position of the swing rod 6 is rotatably connected with the roller 7. The output end of the driving part 8 is in transmission connection with the roller. For example, the driving part 8 is an electric motor, and the motor shaft is in transmission connection with the roller through a belt or a gear. In the measurement process, the roller 7 is brought close to the first through slot 13 by manually swinging the swing rod 6 relative to the fixed seat 5, so that the roller 7 abuts against the first diameter part 201 in the first through slot 13, and the driving part 8 drives the roller 7 to rotate, and the roller 7 drives the first diameter part 201 to rotate in the first through slot 13.

[0066] In specific schemes, the hinged shaft connecting the swing rod 6 and the fixed seat 5 and the rotating shaft connecting the roller 7 and the swing rod 6 are both parallel to the extension axis of the first through slot 13, so that the roller 7 can be close to and abut against the first diameter part 201 along the radial direction. The first axial position, the second axial position and the third axial position are three different axial positions on the swing rod 6. Here, the second axial position and the third axial position are respectively on both sides of the first axial position, i.e. the driving part 8 and the roller 7 are respectively on both sides of the fixed seat 5, so as to ensure the force balance of the swing rod 6. Moreover, a handle 9 is arranged on the side of the third axial position away from the second axial position, so as to facilitate the operation of the staff.

[0067] The fixed seat 5 is provided with a limiting seat 10 and a limiting screw 11 to form a limiting structure. The limiting seat 10 is connected to the side of the fixed seat 5 facing the bearing jig 1 and is located below the swing lever 6. The limiting screw 11 penetrates and is connected to the limiting seat 10, extends in the vertical direction, and is located on the swing path of the swing lever 6. By rotating the limiting screw 11, the limiting screw 11 can be adjusted to the appropriate position, and when the swing lever 6 rotates to abut against the limiting screw 11, the roller 7 just abuts against and exerts a certain pressure on the first diameter part 201 in the first through groove 13, so that the roller 7 can drive the first diameter part 201 to rotate in the first through groove 13. In this way, by providing the limiting structure, the roller 7 can exert consistent and stable pressure on the first diameter part 201, which is beneficial to improve the measurement accuracy.

[0068] The basic principles of the application are described above in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects and the like mentioned in the application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the must-have of each embodiment of the application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above-mentioned specific details, which are not limited to the above-mentioned specific details.

[0069] The block diagram of the device, apparatus, equipment, system involved in the application is only an illustrative example and is not intended to require or imply that the connection, arrangement and configuration shown in the block diagram must be connected, arranged and configured. As those skilled in the art will recognize, these devices, apparatus, equipment, system can be connected, arranged and configured in any way. Words such as "include", "contain", "have" and the like are open-ended words, which mean "include but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0070] It should be understood that the limiting words "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the application are only used to make the technical solutions clearer, and cannot be used to limit the protection scope of the application.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the application to the forms disclosed herein. Although the above has discussed a plurality of example aspects and embodiments, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A coaxiality measuring device for measuring coaxiality of a stepped pin including a first diameter portion and a second diameter portion, characterized by, The coaxiality measuring device comprises: A bearing jig, an upper end surface of the bearing jig is provided with a first through slot and a second through slot which are coaxial and communicate, the first diameter part of the stepped pin is placed in the first through slot, and the second diameter part of the stepped pin is placed in the second through slot; A measuring assembly, the measuring assembly is provided with a plurality of measuring heads, the plurality of measuring heads are arranged at least in the second through slot to measure the distance between the second diameter part and the slot wall of the second through slot, and the measuring assembly calculates the coaxiality of the stepped pin according to the distance values measured by the plurality of measuring heads.

2. The coaxiality measuring device according to claim 1, characterized in that The slot bottom of the first through slot of the bearing jig is provided with two support inclined surfaces which have the same inclination angle relative to the slot wall, the two support inclined surfaces are used for abutting against the first diameter part of the stepped pin, so that the central axis of the first diameter part is kept on the central surface of the first through slot, and the second diameter part of the stepped pin is suspended in the second through slot.

3. The coaxiality measuring device of claim 2, wherein The measuring assembly is further provided with a control box which is communicatively connected with the plurality of measuring heads to calculate the coaxiality of the stepped pin according to the distance values measured by the plurality of measuring heads.

4. The coaxiality measuring device of claim 3, wherein The measuring assembly comprises a pneumatic measuring instrument which is communicatively connected with the control box, and the plurality of measuring heads are all arranged as pneumatic measuring heads of the pneumatic measuring instrument, and the plurality of measuring heads comprise: First measuring heads, two first measuring heads are arranged and are in communication with the same pneumatic channel of the control box, and the two first measuring heads are symmetrically arranged on two slot walls of the second through slot; Second measuring heads, the second measuring heads are in one-to-one communication with the pneumatic channels of the control box; Among them, one second measuring head is arranged on one of the slot walls of the second through slot; or two second measuring heads are symmetrically arranged on the two slot walls of the second through slot.

5. The coaxiality measuring device of claim 4, wherein, The plurality of measuring heads further comprise: Third measuring heads, two third measuring heads are arranged and are in communication with the same pneumatic channel of the control box, and the two third measuring heads are symmetrically arranged on two slot walls of the first through slot; Fourth measuring heads, the fourth measuring heads are in one-to-one communication with the pneumatic channels of the control box; Among them, one fourth measuring head is arranged on one of the slot walls of the first through slot; or two fourth measuring heads are symmetrically arranged on the two slot walls of the first through slot.

6. The coaxiality measuring device of claim 3, wherein The control box is provided with a display screen for displaying measurement data.

7. The coaxiality measuring device of claim 1, wherein The diameter of the first diameter part is smaller than the diameter of the second diameter part, and the slot width of the first through slot is smaller than the slot width of the second through slot.

8. The coaxiality measuring device of claim 2, wherein, The bearing jig is provided with a blocking structure which is located at one end of the second through slot away from the first through slot and is used for axially limiting the stepped pin.

9. The coaxiality measuring device of claim 8, wherein, The blocking structure comprises: A blocking seat arranged on the bearing jig; A blocking screw screwed on the blocking seat and extending in the axial direction of the second through slot.

10. The coaxiality measuring device according to any one of claims 1 to 9, characterized in that Further comprising: A rotating assembly having a roller capable of approaching and moving away from the first through slot, the roller is used for abutting against the first diameter part to drive the first diameter part to rotate in the first through slot.

11. The coaxiality measuring device of claim 10, wherein, The rotating assembly comprises: The fixed seat and the swing rod are rotatably connected at one end of the swing rod to the fixed seat, and the other end is provided with the roller; The driving member is arranged on the swing rod and drives the roller to rotate; Wherein, the fixed seat and the swing rod are provided with a limiting structure for limiting the swing rod from swinging towards the first through groove.

12. The coaxiality measuring device of claim 11, wherein, The limiting structure comprises: The limiting seat is arranged on the fixed seat; The limiting screw is screwed on the limiting seat and extends towards the swing rod.

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