A size measuring mechanism of a ferrule and a size measuring method

Abstract

The application provides a kind of ferrule size measuring mechanism and size measuring method, and the size measuring mechanism of ferrule includes left positioning frame and right positioning frame arranged at the left and right sides of measuring station, and rotating propulsion device and inner diameter measuring device arranged at the front and rear sides of measuring station;The left positioning frame is fixedly arranged, and the right positioning frame can be arranged left and right translation;It also includes multiple displacement sensors, and multiple displacement sensors respectively measure the left and right translation distance of right positioning frame, the front and rear translation distance of rotating propulsion device, the spacing between two insertion parts in inner diameter measuring device and the translation distance of left insertion part. The inner diameter, outer diameter, thickness, wall thickness, outer diameter roundness, inner diameter roundness and coaxiality parameters of ferrule can be measured simultaneously by using one station, and the structure design is ingenious, compact and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bearing parts, in particular to the field of detection of bearing rings, and more particularly to a size measuring mechanism and method for bearing rings. BACKGROUND

[0002] A bearing ring is a ring-shaped part of a radial rolling bearing having one or several raceways, and is an important component for assembling a bearing. After the production and processing of the bearing ring are completed, the size (such as the inner diameter, the outer diameter, and the concentricity) of the bearing ring needs to be detected. At present, the detection of bearings or bearing rings is carried out in multiple stations respectively, that is, one station can only detect one size. For example, a bearing detection device disclosed in CN216539619U detects the inner diameter and the outer diameter by different mechanisms in two stations respectively, which has a complex structure, a large volume, and a high cost. SUMMARY

[0003] To this end, the present application provides a size measuring mechanism and method for bearing rings to solve the above problems.

[0004] To achieve the above-mentioned purpose, the technical solutions provided by the present application are as follows:

[0005] A size measuring mechanism for a bearing ring comprises left and right positioning frames arranged on the left and right sides of a measuring station, and a rotating propulsion device and an inner diameter measuring device arranged on the front and back sides of the measuring station. The left and right positioning frames have an outer peripheral limiting portion corresponding to the measuring station and a limiting column located behind the outer peripheral limiting portion. The left positioning frame is fixedly arranged, and the right positioning frame is arranged to be translatable left and right. The rotating propulsion device has a shaft column corresponding to the measuring station, a first propeller for driving the shaft column to move forward and backward, and a rotating driver for driving the shaft column to rotate. The inner diameter measuring device has two sliding blocks arranged opposite to each other, an elastic member arranged between the two sliding blocks, a clamping cylinder for driving the two sliding blocks to open and close, and a second propeller for driving the two sliding blocks to move forward and backward. The front ends of the two sliding blocks are provided with insertion portions for insertion into the bearing ring.

[0006] Further, the size measuring mechanism comprises a plurality of displacement sensors for measuring the left and right translation distances of the right positioning frame, the forward and backward translation distances of the rotating propulsion device, the distance between the two insertion portions of the inner diameter measuring device, and the translation distance of the left insertion portion.

[0007] Further, the outer peripheral limiting portion of the left positioning frame comprises a concave accommodation arc segment and first positioning protrusions arranged at the upper and lower ends of the accommodation arc segment. The outer peripheral limiting portion of the right positioning frame is a second positioning protrusion.

[0008] Further, the limiting column is a cylindrical column.

[0009] Further, the insertion part of one of the two sliding blocks is provided with two protrusions of the first protrusion on the outer side surface, and the insertion part of the other sliding block is provided with one protrusion of the second protrusion on the outer side surface.

[0010] Further, the first protrusion and the second protrusion are both spherical arc protrusions.

[0011] Further, the end surface of the shaft column is a rectangular end surface, the length dimension of the end surface is greater than the inner diameter of the sleeve ring and less than the outer diameter of the sleeve ring, and the width dimension of the end surface is less than the inner diameter of the sleeve ring.

[0012] Further, the machine frame is further provided, the machine frame comprises a loading plate, a left fixed frame and a right fixed frame, the left fixed frame and the right fixed frame are distributed on the left and right sides of the measuring station and are fixed on the loading plate, the left positioning frame is fixedly assembled on the left fixed frame, the right positioning frame is slidably assembled on the right fixed frame, and the rotating pushing device and the inner diameter measuring device are both assembled on the loading plate.

[0013] Further, the displacement sensor is an LVDT displacement sensor, and the number of the displacement sensor is four, which are a first displacement sensor, a second displacement sensor, a third displacement sensor and a fourth displacement sensor; the first displacement sensor is arranged between the right fixed frame and the right positioning frame, the second displacement sensor is arranged between the left positioning frame and the rotating pushing device, the third displacement sensor is arranged between the two sliding blocks, and the fourth displacement sensor is arranged between the left sliding block and a fixed block.

[0014] A size measuring method of a sleeve ring, comprising the following steps:

[0015] A1, providing the sleeve ring size measuring mechanism and a sleeve ring standard part, and placing the sleeve ring standard part on the measuring station;

[0016] A2, driving the right positioning frame to approach the measuring station, until the sleeve ring standard part is clamped and positioned; the displacement sensor measures the displacement size L1 of the right positioning frame in the clamped position;

[0017] A3, the first pusher of the rotating pushing device drives the shaft column to approach the measuring station, until the shaft column abuts against the end surface of the sleeve ring standard part, and the displacement sensor measures the displacement size L2 of the rotating pushing device in the abutting position;

[0018] A4, the clamping cylinder of the inner diameter measuring device drives the two sliding blocks to close, the second pusher drives the two sliding blocks to approach the measuring station, and the two insertion parts are inserted into the sleeve ring standard part; then the clamping cylinder releases the clamping force, the two insertion parts are separated under the action of the elastic member until they abut against the inner ring of the sleeve ring standard part, and the displacement sensor measures the distance L3 between the two insertion parts and the translation distance L4 of the left insertion part;

[0019] A5, the sleeve size measuring mechanism is reset, the sleeve ring standard part is replaced with a sleeve ring detection part, and the steps of A2 to A4 are repeated to obtain the displacement size L11 of the right positioning frame in the clamping position, the displacement size L21 of the rotating pusher in the abutting position, the distance L31 between the two insertion parts, and the translation distance L41 of the left insertion part, the outer diameter size of the sleeve ring detection part = the outer diameter size of the sleeve ring standard part + (L11-L1); the thickness size of the sleeve ring detection part = the thickness size of the sleeve ring standard part + (L21-L2); the inner diameter size of the sleeve ring detection part = the inner diameter size of the sleeve ring standard part + (L31-L3); and the wall thickness size of the sleeve ring detection part = the wall thickness size of the sleeve ring standard part + (L41-L4);

[0020] A6, the rotating driver drives the shaft column to rotate, the rotation of the shaft column drives the sleeve ring detection part to rotate, the right positioning frame adaptively translates with the change of the outer diameter size of the sleeve ring detection part, the displacement sensor measures the displacement change of the right positioning frame to obtain the outer diameter roundness, the two insertion parts adaptively close or open with the change of the inner diameter size of the sleeve ring detection part, the displacement sensor measures the distance change between the two insertion parts to obtain the inner diameter roundness, and the displacement sensor measures the displacement change of the left insertion part to obtain the coaxiality.

[0021] The technical scheme provided by the application has the following beneficial effects:

[0022] According to the scheme provided by the application, the inner diameter, the outer diameter, the thickness, the wall thickness, the outer diameter roundness, the inner diameter roundness and the coaxiality of the sleeve ring can be measured at one station, the structure is ingenious, compact and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 shows a three-dimensional schematic view of a sleeve ring size measuring mechanism in an embodiment;

[0024] Figure 2 Fig. 3 shows a rear view of part of the structure of the sleeve ring size measuring mechanism in the embodiment;

[0025] Figure 3 Fig. 5 shows an assembly structure schematic view of the left positioning frame and the left fixed frame in the embodiment;

[0026] Figure 4Figure 6 shows a schematic view of the assembly structure of the right positioning frame and the right fixing frame in the embodiment;

[0027] Figure 5 Figure 7 shows a schematic view of the structure of the rotating pushing device in the embodiment;

[0028] Figure 6 Figure 8 shows a schematic view of the structure of the inner diameter measuring device in the embodiment. DETAILED DESCRIPTION

[0029] To further illustrate the embodiments, the present application provides accompanying drawings. These drawings are part of the disclosure of the present application, which mainly serve to illustrate the embodiments, and can be used to explain the operating principles of the embodiments in conjunction with the relevant description of the specification. Those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application in conjunction with these contents. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] The present application will be further illustrated in conjunction with the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 6 As shown, the present embodiment provides a size measuring mechanism for a ferrule, which includes a left positioning frame 30 and a right positioning frame 40 arranged on the left and right sides of a measuring station a, and a rotating pushing device 50 and an inner diameter measuring device 60 arranged on the front and rear sides of the measuring station a. Specifically, the measuring station a is only a fixed position, not a physical structure, such as Figure 1 and Figure 2 As shown, the position of the ferrule 100 clamped between the left positioning frame 30 and the right positioning frame 40 is the measuring station a.

[0032] The left positioning frame 30 and the right positioning frame 40 have a peripheral limiting portion corresponding to the measuring station a and a limiting column located behind the peripheral limiting portion. Specifically, the peripheral limiting portion and the limiting column of the left positioning frame 30 are defined as a left peripheral limiting portion 31 and a left limiting column 32, respectively, and the peripheral limiting portion and the limiting column of the right positioning frame 40 are defined as a right peripheral limiting portion 41 and a right limiting column 42, respectively.

[0033] The left positioning frame 30 is fixedly arranged, and the right positioning frame 40 is arranged to be translatable left and right. When positioning, the ferrule 100 can be first placed on the measuring station a, and the left peripheral limiting portion (i.e., the left peripheral limiting portion 31) of the left positioning frame 30 and the peripheral limiting portion (i.e., the right peripheral limiting portion 41) of the right positioning frame can be used to jointly clamp the outer periphery of the ferrule 100 by driving the right positioning frame 40 to move left, thereby achieving clamping and positioning of the ferrule 100.

[0034] The rotating propulsion device 50 has a shaft column 51 corresponding to the measuring station a, a first propeller 52 driving the shaft column 51 to move forward and backward, and a rotating driver 53 driving the shaft column 51 to rotate; the first propeller 52 can drive the shaft column 51 to move close to or away from the measuring station a, so that the shaft column 51 abuts against the ferrule 100 of the measuring station a; the rotating driver 53 can drive the shaft column 51 to rotate, and the rotation of the shaft column 51 can drive the ferrule 100 to rotate through the friction force of the contact. Specifically, the shaft column 51 is assembled on the rotating shaft of the rotating driver 53, and the first propeller 52 is drivingly connected to the rotating driver 53, so as to drive the rotating driver 53 and the shaft column 51 thereon to move close to or away from the measuring station a.

[0035] The inner diameter measuring device 60 has two sliding blocks (a left sliding block 631 and a right sliding block 632) arranged oppositely, an elastic member 64 arranged between the two sliding blocks, a clamping air cylinder 62 driving the two sliding blocks to open and close, and a second propeller 61 driving the two sliding blocks to move forward and backward; the front ends of the two sliding blocks are each provided with an insertion part 633 for being inserted into the ferrule 100; the second propeller 61 can drive the insertion parts 633 to move close to or away from the measuring station a, so that the insertion parts 633 are inserted into the ferrule 100; the clamping air cylinder 62 can drive the two insertion parts 633 to move close to each other, so as to be inserted into the ferrule 100 by reducing the volume; the elastic member 64 is specifically a spring, which drives the two insertion parts 633 to open when the clamping force of the clamping air cylinder 62 is removed, so that the two insertion parts 633 abut against the inner wall of the ferrule 100 adaptively.

[0036] Further, a plurality of displacement sensors 70 are included, which are four in the embodiment, and the four displacement sensors 70 respectively measure the left-right translation distance of the right positioning frame 40, the forward-backward translation distance of the rotating propulsion device 50, the distance between the two insertion parts 633 of the inner diameter measuring device 60, and the translation distance of the left insertion part 633 (i.e. the left sliding block 631). In this way, the corresponding size parameters are obtained, which are convenient for obtaining the actual size of the ferrule 100 subsequently.

[0037] The embodiment also provides a size measuring method of a ferrule, which is a measuring method based on the size measuring mechanism of the ferrule.

[0038] A1, the size measuring mechanism of the ferrule and a ferrule standard part are provided, and the ferrule standard part is placed on the measuring station a;

[0039] Specifically, the ferrule standard part refers to a standard product with known sizes and meeting the requirements.

[0040] A2, drive the right positioning frame 40 to the left to approach the measuring station a, until the ferrule standard part is clamped and positioned; the displacement sensor 70 measures the displacement size L1 when the right positioning frame 40 is in the clamped position;

[0041] Specifically, during the left movement of the right positioning frame 40, the outer peripheral limiting part (i.e. the right outer peripheral limiting part 41) of the right positioning frame 40 continuously approaches the ferrule standard part and finally abuts on the outer peripheral side of the ferrule standard part, and the left outer peripheral limiting part 31 of the left positioning frame 30 and the right outer peripheral limiting part 41 of the right positioning frame 40 jointly clamp and position the ferrule standard part.

[0042] A3, the first pusher 52 of the rotating pusher 50 drives the shaft column 51 to approach the measuring station a, until it abuts on the end face (specifically the front end face, while the rear end face of the ferrule standard part abuts on the limiting column, achieving front and rear positioning) of the ferrule standard part, and the displacement sensor 70 measures the displacement size L2 when the shaft column 51 of the rotating pusher 50 is in the abutting position.

[0043] A4, the clamping air cylinder 62 of the inner diameter measuring device 60 drives the two sliding blocks to approach each other to reduce the distance, and the second pusher 61 drives the two sliding blocks to approach the measuring station a, so that the two insertion parts 633 are inserted into the ferrule standard part; then the clamping air cylinder 62 releases the clamping force, and the two insertion parts 633 are separated under the action of the elastic member 64 until they abut on the inner wall of the ferrule standard part, and the displacement sensor 70 measures the distance L3 between the two insertion parts 633 and the translation distance L4 of the left insertion part 633.

[0044] A5, the size measuring mechanism of the ferrule is reset, i.e. each component is reset to the initial state. The ferrule standard part is replaced by a ferrule detection part, and the steps A2 to A4 are repeated to obtain the displacement size L11 when the right positioning frame 40 is in the clamped position, the displacement size L21 when the shaft column 51 of the rotating pusher 50 is in the abutting position, the distance L31 between the two insertion parts 633, and the translation distance L41 of the left insertion part 631. In this way, the outer diameter size of the ferrule detection part = the outer diameter size of the ferrule standard part + (L11-L1); the thickness size of the ferrule detection part = the thickness size of the ferrule standard part + (L21-L2); the inner diameter size of the ferrule detection part = the inner diameter size of the ferrule standard part + (L31-L3); and the wall thickness size of the ferrule detection part = the wall thickness size of the ferrule standard part + (L41-L4) can be directly obtained.

[0045] A6, the rotating driver 53 drives the rotating of the shaft column 51, the rotating of the shaft column 51 drives the rotating of the sleeve ring detection member, the right positioning frame 40 is self-adapting to the displacement of the outer diameter size of the sleeve ring detection member, the displacement sensor 70 measures the displacement change of the right positioning frame 40, and the outer diameter roundness is obtained; two insertion parts 633 are self-adapting to the displacement of the inner diameter size of the sleeve ring detection member, the displacement sensor 70 measures the interval change of the two insertion parts 633, and the inner diameter roundness is obtained; the displacement sensor 70 measures the displacement change of the left insertion part 633 (that is, the left sliding block 631), and the coaxiality is obtained.

[0046] Specifically, because the left side of the sleeve ring 100 is resisted by the left positioning frame 30, the left side position of the sleeve ring 100 is always unchanged, and the thickness (the interval between the outer side wall and the inner side wall) of the sleeve ring 100 and the change amount (that is, the coaxiality) can be obtained by detecting the displacement change of the left insertion part 633. More specifically, the thickness size of the sleeve ring 100 refers to the distance between the front end face and the rear end face of the sleeve ring 100.

[0047] The outer peripheral limiting part (that is, the left outer peripheral limiting part 31) of the left positioning frame 30 includes an inwardly recessed accommodation arc segment 311 and a first positioning convex rib 312 arranged at the upper and lower ends of the accommodation arc segment 311, and the outer peripheral limiting part (that is, the right outer peripheral limiting part 41) of the right positioning frame 40 is a convex second positioning convex rib. The right positioning frame 40 pushes the sleeve ring 100 to the left through the second positioning convex rib 41 until the sleeve ring 100 contacts the two first positioning convex ribs 312, and when clamping and positioning, the sleeve ring 100 is clamped by the two first positioning convex ribs 312 and the second positioning convex rib 41 to form three-point positioning, and the accommodation arc segment 311 does not contact the sleeve ring 100. The structure of three-point positioning has better accuracy. Specifically, the first positioning convex rib 312 and the second positioning convex rib 41 are both arc surfaces, which realize smooth transition with the sleeve ring 100 and are not easy to scratch the sleeve ring.

[0048] The limiting column (that is, the left limiting column 32) of the left positioning frame 30 is arranged at the middle position of the accommodation arc segment 311 and corresponds to the limiting column (that is, the right limiting column 42) of the right positioning frame 40. When the pushing device 50 pushes the sleeve ring 100 backward, the rear end face of the sleeve ring 100 abuts against the left limiting column 32 and the right limiting column 42, and the force is uniform and not easy to tilt and deviate. Specifically, the limiting columns are all cylinders, so that the end face of the sleeve ring 100 abuts against the circumferential surface of the limiting column to form smooth transition and is not easy to scratch, and the contact area is small and the friction is small.

[0049] Further, in order to facilitate the installation of various components, the embodiment further comprises a rack, which comprises a loading platform 11, a left fixed frame 12 and a right fixed frame 13, the left fixed frame 12 and the right fixed frame 13 are distributed on the left and right sides of the measuring station and are fixed on the loading platform 11, the left positioning frame 30 is fixedly assembled on the left fixed frame 12, the right positioning frame 40 is slidably assembled on the right fixed frame 13, and the rotating propulsion device 50 and the inner diameter measuring device 60 are both assembled on the loading platform 11. In this way, the installation of various components is realized, and the size measuring mechanism forms an independent machine table structure.

[0050] Further, the right fixed frame 13 is provided with a driving cylinder 131, and the piston rod of the driving cylinder 131 is connected to the right positioning frame 40 to drive the right positioning frame 40 to slide left and right.

[0051] The displacement sensor 70 is an LVDT displacement sensor (also known as an inductance pen), and the number is four, which are a first displacement sensor 71, a second displacement sensor 72, a third displacement sensor 73 and a fourth displacement sensor 74. The first displacement sensor 71 is arranged between the right fixed frame 13 and the right positioning frame 40 to detect the displacement of the right positioning frame 40. The second displacement sensor 72 is arranged between the left positioning frame 30 and the rotating propulsion device 50 to detect the forward and backward displacement of the shaft column 51 of the rotating propulsion device 50. The third displacement sensor 73 is arranged between the two sliding blocks (i.e. the left sliding block 631 and the right sliding block 632) to detect the distance between the two insertion parts 633. The fourth displacement sensor 74 is arranged between the left sliding block 631 and a fixed block 65 (which is fixedly arranged with the left positioning frame 30) to detect the displacement of the left sliding block 631 (i.e. the left insertion part 633). The structure design is reasonable, and the measurement accuracy is high. Of course, in other embodiments, the displacement sensor can also use other types of sensors, such as a laser ranging sensor.

[0052] The insertion part 633 of one of the two sliding blocks is provided with two protruding first protrusions on the outer side surface, and the insertion part 633 of the other sliding block is provided with one protruding second protrusion on the outer side surface. When opened, the insertion part 633 of one sliding block abuts on the inner wall surface of the sleeve ring 100 through the two first protrusions thereon, and the insertion part 633 of the other sliding block abuts on the inner wall surface of the sleeve ring 100 through the one second protrusion thereon, forming three-point positioning, which can accurately measure the inner diameter size of the sleeve ring 100. In particular, the first protrusion and the second protrusion are both spherical arc protrusions, so that a smooth transition is formed with the inner wall surface of the sleeve ring 100, and mutual abrasion is not easy.

[0053] The end face of the shaft column 51 is a rectangular end face, the length of the end face is greater than the inner diameter of the sleeve ring 100 and less than the outer diameter of the sleeve ring, and the width of the end face is less than the inner diameter of the sleeve ring 100. In this way, the end face of the shaft column 51 only abuts on part of the end face of the sleeve ring 100. The shaft column 51 rotates to drive the sleeve ring 100 to rotate by contact friction, and the process cannot make the sleeve ring 100 rotate synchronously with the shaft column 51. In fact, the shaft column 51 rotates several rounds to drive the sleeve ring 100 to rotate one round, and therefore, the shaft column 51 can also rotate relative to the sleeve ring 100. When the shaft column 51 rotates relative to the sleeve ring 100, the shaft column 51 can contact different positions of the end face of the sleeve ring 100. When contacting different positions, the shaft column 51 moves forward and backward adaptively, and therefore, by detecting the size of the forward and backward movement of the shaft column 51, the uniformity of the thickness of the sleeve ring 100 can be obtained. Further, the measurement types are increased.

[0054] Through the scheme provided in the application, the inner diameter, the outer diameter, the thickness, the wall thickness, the outer diameter roundness, the inner diameter roundness and the coaxiality and other parameters of the sleeve ring can be measured simultaneously by using one station, the structure design is ingenious, compact and low in cost.

[0055] Although the application is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made in form and details without departing from the spirit and scope of the application as defined in the appended claims, and all such changes are within the protection scope of the application.

Claims

1. A ferrule size measuring mechanism, characterized by: It comprises a left positioning frame and a right positioning frame arranged on the left and right sides of the measuring station, and a rotary propulsion device and an inner diameter measuring device arranged on the front and rear sides of the measuring station; the left positioning frame and the right positioning frame have an outer peripheral limiting portion corresponding to the measuring station and a limiting column located behind the outer peripheral limiting portion, the left positioning frame is fixedly arranged, and the right positioning frame can be translated left and right; the rotary propulsion device has a shaft column corresponding to the measuring station, a first propeller for driving the shaft column to move back and forth, and a rotary driver for driving the shaft column to rotate; the end face of the shaft column is a rectangular end face, the length dimension of the end face is larger than the inner diameter of the ferrule and smaller than the outer diameter of the ferrule; the width dimension of the end face is smaller than the inner diameter of the ferrule; The inner diameter measuring device comprises a fixed block, two sliding blocks arranged opposite to each other on the left and right sides, an elastic member arranged between the two sliding blocks, a clamping cylinder for driving the two sliding blocks to open and close, and a second propeller for driving the two sliding blocks to move forward and backward, wherein the two sliding blocks are respectively a left sliding block and a right sliding block; the front ends of the left sliding block and the right sliding block are each provided with an insertion portion for inserting into a ferrule; It also includes four LVDT displacement sensors, namely a first displacement sensor, a second displacement sensor, a third displacement sensor and a fourth displacement sensor; the first displacement sensor is arranged between the right fixed frame and the right positioning frame to measure the left and right translation distance of the right positioning frame, the second displacement sensor is arranged between the left positioning frame and the rotary propulsion device to measure the front and rear translation distance of the rotary propulsion device, the third displacement sensor is arranged between the left sliding block and the right sliding block to measure the distance between the insertion part of the left sliding block and the insertion part of the right sliding block in the inner diameter measuring device, and the fourth displacement sensor is arranged between the left sliding block and the fixed block to measure the translation distance of the insertion part of the left sliding block.

2. The ferrule size measuring mechanism according to claim 1, characterized in that: The outer peripheral limiting portion of the left positioning frame includes a recessed arc segment and first positioning ribs arranged at the upper and lower ends of the arc segment; the outer peripheral limiting portion of the right positioning frame is a raised second positioning rib.

3. The ferrule size measuring mechanism according to claim 1, characterized in that: The limiting column is a cylinder.

4. The ferrule size measuring mechanism according to claim 1, characterized in that: In the insertion parts of the left sliding block and the right sliding block, two raised first bulges are provided on the outer surface of the insertion part of the left sliding block, and one raised second bulge is provided on the outer surface of the insertion part of the right sliding block; or, two raised first bulges are provided on the outer surface of the insertion part of the right sliding block, and one raised second bulge is provided on the outer surface of the insertion part of the left sliding block.

5. The ferrule size measuring mechanism according to claim 4, characterized in that: The first bract and the second bract are both spherical arc-shaped bracts.

6. The ferrule size measuring mechanism according to claim 1, characterized in that: It also includes a frame, which includes a carrier plate, a left fixed frame and a right fixed frame. The left fixed frame and the right fixed frame are distributed on the left and right sides of the measuring station and are fixed on the carrier plate. The left positioning frame is fixedly assembled on the left fixed frame, and the right positioning frame can be slid left and right on the right fixed frame. The rotating propulsion device and the inner diameter measuring device are both assembled on the carrier plate.

7. A method for measuring the size of a ferrule, characterized in that: The steps include: A1. Provide the ferrule size measuring mechanism and ferrule standard part according to any one of claims 1 to 6, and place the ferrule standard part on a measuring station; A2 drives the right positioning frame to the left, close to the measuring station, until the ferrule standard is clamped and positioned; the first displacement sensor measures the displacement dimension L1 of the right positioning frame when it is in the clamping position; A3: The first propeller of the rotary propulsion device drives the shaft column close to the measuring station until it abuts against the end face of the ferrule standard component. The second displacement sensor measures the displacement dimension L2 of the rotary propulsion device when it is in the abutment position. A4: The clamping cylinder of the inner diameter measuring device drives the left and right sliding blocks together, and the second pusher drives the left and right sliding blocks close to the measuring station, so that the insertion parts of the left and right sliding blocks are inserted into the ferrule standard component. The clamping cylinder then releases the clamping force, and the insertion parts of the left and right sliding blocks are separated by the elastic member until they respectively abut the inner ring of the ferrule standard component. The third displacement sensor measures the distance L3 between the insertion parts of the left and right sliding blocks, and the fourth displacement sensor measures the translation distance L4 of the insertion part of the left sliding block. A5, reset the size measuring mechanism of the ferrule, replace the ferrule standard part with the ferrule detection part, and repeat steps A2 to A4 to obtain the displacement dimension L11 when the right positioning frame is in the clamping position, the displacement dimension L21 when the rotary propulsion device is in the abutment position, the spacing L31 between the insertion part of the left sliding block and the insertion part of the right sliding block, and the translation distance L41 of the insertion part of the left sliding block. The outer diameter dimension of the ferrule detection part = the outer diameter dimension of the ferrule standard part + L11-L1; the thickness dimension of the ferrule detection part = the thickness dimension of the ferrule standard part + L21-L2; the inner diameter dimension of the ferrule detection part = the inner diameter dimension of the ferrule standard part + L31-L3; the wall thickness dimension of the ferrule detection part = the wall thickness dimension of the ferrule standard part + L41-L4; A6, the rotary driver drives the shaft column to rotate, and the rotation of the shaft column drives the ring detection part to rotate. The right positioning frame adaptively translates as the outer diameter size of the ring detection part changes. The first displacement sensor measures the displacement change of the right positioning frame to obtain the outer diameter roundness; the insertion part of the left sliding block and the insertion part of the right sliding block adaptively move closer or open as the inner diameter size of the ring detection part changes. The third displacement sensor measures the spacing change between the insertion part of the left sliding block and the insertion part of the right sliding block to obtain the inner diameter roundness; the fourth displacement sensor measures the displacement change of the insertion part of the left sliding block to obtain the coaxiality.

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