An adjustable false shaft for bearing shell measurement and a measurement method

Abstract

The application discloses an adjustable false shaft for bearing bush measurement, comprising a shaft body, the shaft body comprising a male shaft and a shaft sleeve spliced by a plurality of shaft blocks, the male shaft and the shaft sleeve being coaxially arranged with the male shaft inside and the shaft sleeve outside, the outer wall of the male shaft being conical surface arranged, the inner wall of the shaft sleeve being connected with the outer wall of the male shaft in cooperation, the outer wall of the shaft sleeve being cylindrical surface arranged, and the end of the male shaft with a small axial section being provided with a screw rod, the screw rod being provided with an adjusting nut. The application further discloses a measurement method for bearing bush measurement, steps being as follows: 1, a plurality of shaft blocks are used to splice the male shaft and the shaft sleeve which are coaxially arranged around the male shaft, and the adjusting nut is threadedly connected with the screw rod; 2, the false shaft is inserted into the bearing bush ring formed by the bearing bush; 3, the adjusting nut is rotated to one side of the male shaft until the outer wall of the shaft sleeve abuts against the inner wall of the bearing bush ring, and the inner diameter size of the bearing bush ring is measured. The application has the characteristics of simple process, less specifications, low cost and simple maintenance in later period, and can be widely applied in the field of centrifuge maintenance.

Description

Technical Field

[0001] The invention relates to the field of centrifuge maintenance, and in particular to an adjustable dummy shaft for bearing bush measurement and a measuring method. Background Art

[0002] Measuring the clearance of bearings is a key step in the maintenance process of centrifuges. With the development of technology, the bearings used in new units are mostly tilting bearings. Currently, the most commonly used measurement method is the false shaft method, but the current measurement method is not very accurate.

[0003] Problems:

[0004] 1. The dummy shaft method requires re-processing of the dummy shaft. Currently, there are many centrifugal units with many shaft diameter specifications, and many dummy shaft specifications need to be prepared;

[0005] 2. The processing cost of the fake shaft is relatively high, and the subsequent storage and maintenance are more troublesome.

[0006] 3. The use of stepped shaft dummy shaft also has problems such as complex processing technology, low measurement accuracy and small measurement range. If the accuracy needs to be improved, the number of steps in an interval will be large and the length of the dummy shaft to be processed will be very long. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology and to provide an adjustable dummy shaft and a measuring method for bearing measurement, which have the characteristics of simple process, few specifications, low cost and simple subsequent maintenance.

[0008] The present invention provides an adjustable dummy shaft for bearing measurement, comprising a shaft body, wherein the shaft body comprises a male shaft and a sleeve assembled from a plurality of shaft blocks, the male shaft and the sleeve are jointly arranged into a coaxial structure with the male shaft inside and the sleeve outside, the outer wall of the male shaft being arranged in a conical surface, the inner wall of the sleeve being cooperatively connected with the outer wall of the male shaft, the outer wall of the sleeve being arranged in a cylindrical surface, a screw being provided at the end with a small axial cross-section of the male shaft, and an adjusting nut being provided on the screw; the diameter of the end with a small axial cross-section of the male shaft is T, the diameter of the other end with a large axial cross-section of the male shaft is D, and when the various shaft blocks are tightly assembled into the sleeve, the inner diameter dimension of the end with a larger inner diameter of the sleeve is d, and D>d>T; the outer diameter of the adjusting nut is H, and the inner diameter dimension of the end with a smaller inner diameter of the sleeve when the various shaft blocks are tightly assembled into the sleeve is h, and H>h.

[0009] In the above technical solution, the angle α between the outer wall of the male shaft and the axis is ≤1°.

[0010] In the above technical solution, a polygonal handle is provided at the end of the male shaft with a larger axial cross-section.

[0011] In the above technical solution, the shaft sleeve is composed of four shaft blocks of the same size and shape.

[0012] The present invention also provides a measurement method for bearing shells, which has the following steps: step 1, surround the male shaft with multiple shaft blocks to form a coaxially arranged male shaft and shaft sleeve, and thread the adjusting nut with the screw; step 2, insert the false shaft formed by the shaft blocks, male shaft, screw and adjusting nut into the bearing shell ring formed by the bearing shell; step 3, rotate the adjusting nut toward one side of the male shaft to cause relative displacement between the shaft block and the male shaft, and the outer diameter of the shaft sleeve continues to increase until the outer wall of the shaft sleeve abuts against the inner wall of the bearing shell ring. The inner diameter of the bearing shell ring can be obtained by measuring the outer diameter of the shaft sleeve at this time.

[0013] In the above technical solution, before step one, the inner diameters A of multiple bearing rings within a certain range are used as a measurement interval to produce a dummy shaft that meets the specifications. The specifications need to take into account the radial size, axial size and the angle α between the outer wall of the male shaft and the axis of the dummy shaft. The specifications of the dummy shaft meet the following relationship: h+2L·tgα+2B≤A≤D+2B, wherein A is the inner diameter of the bearing ring, D is the diameter of the end with the larger axial cross-section of the male shaft, B is the radial size of the end with the smaller radial size of the shaft block, h is the inner diameter of the end with the smaller inner diameter of the sleeve when the various shaft blocks are tightly assembled into a sleeve, L is the axial length of the shaft block, and α is the angle between the outer wall of the male shaft and the axis.

[0014] In the above technical solution, the difference between the maximum inner diameter and the minimum inner diameter of the bearing ring in the measurement interval is 5 mm.

[0015] In the above technical solution, the angle α between the outer wall of the male shaft and the axis is ≤1°.

[0016] In the above technical solution, a polygonal handle is provided at the end of the male shaft with a larger axial cross-section.

[0017] In the above technical solution, the shaft sleeve is composed of four shaft blocks of the same size and shape.

[0018] The present invention provides an adjustable dummy shaft and measurement method for bearing measurement, which has the following beneficial effects: since the mating surfaces of the male shaft and the shaft block are conical surfaces, the shaft block can slide relative to the male shaft under the push of the adjusting nut and the screw, and the outer diameter of the sleeve can be increased or decreased during the sliding, thereby achieving the purpose of outer diameter adjustment, thereby realizing the adjustable performance of the shaft diameter and accurately measuring the bearing clearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the adjustable dummy shaft for bearing bush measurement of the present invention;

[0020] Figure 2The schematic diagram of the size relationship between the parts of the adjustable false shaft for bearing bush measurement of the present application;

[0021] Figure 3 The flowchart of the measurement method for bearing bush measurement of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in combination with the drawings and examples, but the examples should not be understood as limiting the present application.

[0023] Referring to Figures 1 to 2 The adjustable false shaft for bearing bush measurement of the present application comprises a shaft body, the shaft body comprises a male shaft 1 and a sleeve 2 which is composed of a plurality of shaft blocks 2.1, the male shaft 1 and the sleeve 2 are coaxially arranged with the male shaft 1 inside and the sleeve 2 outside, the outer wall of the male shaft 1 is conical, the inner wall of the sleeve 2 is connected with the outer wall of the male shaft 1, the outer wall of the sleeve 2 is cylindrical, the small end of the male shaft 1 in axial section is provided with a screw rod 3, and the screw rod 3 is provided with an adjusting nut 4; the diameter of the small end of the male shaft 1 in axial section is T, the diameter of the large end of the male shaft 1 in axial section is D, the inner diameter of the large end of the sleeve 2 in axial section is d when the plurality of shaft blocks 2.1 are tightly combined into the sleeve 2, and D>d>T; the outer diameter of the adjusting nut 4 is H, the inner diameter of the small end of the sleeve 2 in axial section is h when the plurality of shaft blocks 2.1 are tightly combined into the sleeve 2, and H>h.

[0024] The included angle α between the outer wall of the male shaft 1 and the axis is ≤1°.

[0025] The large end of the male shaft 1 in axial section is provided with a multi-prism handle 5.

[0026] The sleeve 2 is composed of four shaft blocks 2.1 which are the same in size and shape.

[0027] Referring to Figure 2 The measurement method for bearing bush measurement of the present application has the following steps:

[0028] Step one, the inner diameter A of a plurality of bearing bushes with a certain range of sizes is taken as a measurement interval, and a false shaft conforming to the specifications is made, the specifications need to consider the radial size, axial size of the false shaft and the included angle α between the outer wall of the male shaft 1 and the axis,

[0029] The specifications of the false shaft conform to the following relationship:

[0030] h+2L·tgα+2B≤A≤D+2B,

[0031] Wherein,

[0032] A—Inner diameter of the bearing ring, D—Diameter of the end with the larger axial cross-section of the male shaft 1, B—Radial dimension of the end with the smaller radial dimension of the shaft block 2.1, h—Inner diameter of the end with the smaller inner diameter of the shaft sleeve 2 when the shaft blocks 2.1 are tightly assembled into the shaft sleeve 2, L—Axial length of the shaft block 2.1, α—Angle between the outer wall of the male shaft 1 and the axis;

[0033] Step 2: Assemble the multiple shaft blocks 2.1 around the male shaft 1 to form a coaxial male shaft 1 and a shaft sleeve 2, and thread the adjusting nut 4 to the screw 3;

[0034] Step 3: Insert the dummy shaft formed by the shaft block 2.1, the male shaft 1, the screw 3 and the adjusting nut 4 into the bearing ring formed by the bearing bush 6;

[0035] Step 4: Rotate the adjusting nut 4 toward the side of the male shaft 1 to make the shaft block 2.1 and the male shaft 1 move relative to each other. The outer diameter of the sleeve 2 will increase continuously until the outer wall of the sleeve 2 abuts against the inner wall of the bearing ring. The inner diameter of the bearing ring can be obtained by measuring the outer diameter of the sleeve 2 at this time.

[0036] The difference between the maximum inner diameter and the minimum inner diameter of the bearing ring in the measuring interval is 5 mm.

[0037] See also Figures 1 to 2 Since the mating surface between the male shaft 1 and the shaft block 2.1 is a conical surface, the shaft block 2.1 can slide relative to the male shaft 1 under the push of the adjusting nut 4 and the screw 3. In the process of moving from X to Y as shown in the figure, the outer diameter of the sleeve 2 increases or decreases during the sliding, thereby achieving the purpose of outer diameter adjustment, thereby realizing the adjustable performance of the shaft diameter and accurately measuring the bearing clearance.

[0038] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0039] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A measurement method for bearing bushings using an adjustable dummy shaft, wherein the adjustable dummy shaft comprises a shaft body, wherein the shaft body comprises a male shaft (1) and a shaft sleeve (2) composed of a plurality of shaft blocks (2.1), wherein the male shaft (1) and the shaft sleeve (2) are arranged together to form a coaxial structure with the male shaft (1) inside and the shaft sleeve (2) outside, wherein the outer wall of the male shaft (1) is arranged in a conical surface, the inner wall of the shaft sleeve (2) is connected to the outer wall of the male shaft (1), and the outer wall of the shaft sleeve (2) is arranged in a cylindrical surface, and a screw (3) is provided at the end of the male shaft (1) with a smaller axial cross-section, and an adjusting nut (4) is provided on the screw (3). ); the diameter of the end of the male shaft (1) with a smaller axial cross-section is T, the diameter of the other end of the male shaft (1) with a larger axial cross-section is D, and when the shaft blocks (2.1) are tightly assembled into the shaft sleeve (2), the inner diameter of the end of the shaft sleeve (2) with a larger inner diameter is d, and D>d>T; the outer diameter of the adjusting nut (4) is H, and when the shaft blocks (2.1) are tightly assembled into the shaft sleeve (2), the inner diameter of the end of the shaft sleeve (2) with a smaller inner diameter is h, and H>h; the angle α between the outer wall of the male shaft (1) and the axis is ≤1°; the end of the male shaft (1) with a larger axial cross-section is provided with a polygonal handle (5), which is characterized in that :Has the following steps: Step 1: assemble multiple shaft blocks (2.1) around the male shaft (1) to form a coaxially arranged male shaft (1) and shaft sleeve (2), and threadably connect the adjusting nut (4) to the screw rod (3); Step 2: insert the dummy shaft formed by the shaft block (2.1), the male shaft (1), the screw (3) and the adjusting nut (4) into the bearing ring formed by the bearing bush (6); Step 3: Rotate the adjusting nut (4) toward one side of the male shaft (1) to cause relative displacement between the shaft block (2.1) and the male shaft (1), and the outer diameter of the shaft sleeve (2) increases continuously until the outer wall of the shaft sleeve (2) abuts against the inner wall of the bearing ring. The inner diameter of the bearing ring can be obtained by measuring the outer diameter of the shaft sleeve (2) at this time. Before step 1, the inner diameters A of a plurality of bearing rings within a certain range are used as a measurement interval to produce a dummy shaft that meets the specifications. The specifications need to take into account the radial size, axial size and the angle α between the outer wall of the male shaft (1) and the axis. The specifications of the dummy shaft meet the following relationship: h+2L·tgα+2B≤A≤D+2B, Among them, A is the inner diameter of the bearing ring, D is the diameter of the end with the larger axial section of the male shaft (1), B is the radial dimension of the end with the smaller radial dimension of the shaft block (2.1), h is the inner diameter of the end with the smaller inner diameter of the shaft sleeve (2) when the shaft blocks (2.1) are tightly assembled into the shaft sleeve (2), L is the axial length of the shaft block (2.1), α is the angle between the outer wall of the male shaft (1) and the axis, The difference between the maximum inner diameter and the minimum inner diameter of the bearing ring in the measuring interval is 5 mm.

2. The bearing bushing measuring method according to claim 1, characterized in that The shaft sleeve (2) is composed of four shaft blocks (2.1) of the same size and shape.

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