A device for detecting raceway shape and contact point

Abstract

The present invention relates to a device for detecting the shape and contact point of a raceway, comprising a fixed template and a sliding template, wherein the fixed template and the sliding template are connected by an elastic component, arc segments matching the upper and lower arcs of a raceway to be detected are arranged on the fixed template and the sliding template, a rack is installed on the sliding template, a fixed-axis gear train I, a fixed-axis gear train II, a pointer I and a pointer II are also arranged on the fixed template, the fixed-axis gear train I and the fixed-axis gear train II are both meshed with the rack, the pointer I and the pointer II are coaxially superimposed and arranged on the front side of the fixed template, the pointer I is linked with the fixed-axis gear train I, and the pointer II is linked with the fixed-axis gear train II, the present invention is used for synchronously detecting the shape of a raceway and the offset of the center of a raceway arc, and reflecting the theoretical contact point between a steel ball and a raceway through the pointing positions of the pointers I and II.

Description

Technical Field

[0001] The invention relates to a device for detecting a raceway shape and a contact point, belonging to the technical field of bearing raceway detection. Background Art

[0002] Slewing bearing is a large bearing that can withstand comprehensive loads. It is an important transmission component required for machinery that needs to make relative rotational motion between two objects and also needs to withstand axial force, radial force, and tipping torque at the same time. Slewing bearing generally includes outer ring, inner ring, steel ball and sealing belt. The steel ball moves in the raceway of the outer ring and inner ring. The raceway is an important component of the slewing bearing structure. The change of the contact point between the raceway and the steel ball is caused by the up and down offset of the center of the upper and lower raceway arcs. Different center offsets reflect different contact points. The raceway is processed by the machine tool driven tool cutting method. Due to the rigidity of the machine tool, the clearance and the dimensional error of the tool, it is inevitable that the actual raceway shape actually processed will not match the theoretical shape, that is, the up and down offset of the center of the upper and lower raceway arcs will change, but as long as it is guaranteed to be within the tolerance range allowed by the design.

[0003] The traditional method of detecting the raceway shape is to use a standard raceway template. The template is fixed in shape and cannot be moved up and down, so it cannot directly reflect the accuracy of the actual contact point, which seriously affects the detection efficiency and test results. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a roller track shape and contact point detection device, comprising a fixed template and a sliding template, wherein the fixed template and the sliding template are connected by an elastic component, and arc segments are provided on the fixed template and the sliding template;

[0005] The elastic component includes a sliding needle, a sliding sleeve and a compression spring. The sliding needle is fixed on the sliding template, the sliding sleeve is fixed on the fixed template, the sliding needle is slidably arranged in the sliding sleeve, the compression spring is located between the sliding sleeve and the sliding template and is sleeved on the sliding needle, and the fixed template is provided with a limit block for limiting the position of the sliding template.

[0006] A rack is installed on the sliding template, and the transmission direction of the rack is parallel to the expansion and contraction direction of the compression spring. A fixed-axis gear train I, a fixed-axis gear train II, a pointer I and a pointer II are also provided on the fixed template. The fixed-axis gear train I and the fixed-axis gear train II are both meshed with the rack, and the pointer I and the pointer II are coaxially superimposed and arranged on the front of the fixed template. The pointer I is linked to the fixed-axis gear train I, and the pointer II is linked to the fixed-axis gear train II. The rotation direction of the terminal output gear of the fixed-axis gear train I is opposite to the rotation direction of the terminal output gear of the fixed-axis gear train II.

[0007] The fixed-axis gear train I and the fixed-axis gear train II use gear transmission with a suitable transmission ratio, so that the angular displacement outputted by the rack movement to the pointer I and the pointer II is the same. Through this part of the device, the displacement output of the sliding template to the angle change of the pointer I and the pointer II can be realized. According to the actual angle change of the pointer I and the pointer II, the actual processed raceway arc center offset can be detected. The pointing of the pointer I and the pointer II reflects the theoretical contact point between the steel ball and the raceway, realizing the synchronous detection of the raceway shape and the raceway arc center offset.

[0008] Furthermore, the fixed template and the sliding template are provided with positioning bolts and oblong holes, and the measurement results are saved when the measurement is completed.

[0009] The beneficial effects of the present invention are:

[0010] 1. Compare and measure the raceway shape through two templates, and convert the sliding displacement of the sliding template under the action of the compression spring into the angle change between pointers Ⅰ and Ⅱ. According to the actual change of the angle between pointers Ⅰ and Ⅱ, the center offset of the actual processed raceway arc can be detected;

[0011] 2. The directions of pointers Ⅰ and Ⅱ reflect the theoretical contact points between the steel ball and the raceway, realizing the synchronous detection of the raceway shape and the offset of the raceway arc center. The detection results are direct, efficient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front structural schematic diagram of the present invention;

[0013] Figure 2 It is a schematic diagram of the reverse structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the pointer and fixed-axis gear train structure of the present invention;

[0015] Figure 4 It is a schematic diagram of the back structure of the fixed template of the present invention;

[0016] Figure 5 It is a schematic diagram of the back structure of the sliding template of the present invention;

[0017] Figure 6 It is a schematic diagram of the standard raceway structure;

[0018] Figure 7 The schematic diagram of the contact point change structure after the center offset of the upper and lower raceway arcs increases;

[0019] Figure 8 The schematic diagram of the contact point change structure after the upper and lower raceway arc center offset is reduced;

[0020] Fig. 9This is a schematic diagram of the standard roller pointer position;

[0021] Fig.10 This is a schematic diagram of the change in the pointer angle after the center offset of the upper and lower raceway arcs increases;

[0022] Fig.11 Schematic diagram of the change in pointer angle after the center offset of the upper and lower raceway arcs is reduced.

[0023] In the figure, 1 fixed template, 1.1 arc Ⅰ, 2 sliding template, 2.1 arc Ⅱ, 3.1 sliding needle, 3.2 sliding sleeve, 3.3 compression spring, 4 limit block, 5 rack, 6 fixed axis gear train Ⅰ, 7 fixed axis gear train Ⅱ, 8 pointer Ⅰ, 9 pointer Ⅱ, 10 positioning bolt, 11 oblong hole, 12 raceway bearing, 13 upper raceway, 14 lower raceway, 15 steel ball, A upper contact point, A' lower contact point, R upper raceway arc radius, R' lower raceway arc radius. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] As shown in the figure, a raceway shape and contact point detection device comprises a fixed template 1 and a sliding template 2, wherein the fixed template 1 and the sliding template 2 are connected by an elastic component, the fixed template 1 is provided with an arc Ⅰ1.1, and the sliding template 2 is provided with an arc Ⅱ2.1, and the radius of the arc Ⅰ1.1 and the radius of the arc Ⅱ2.1 are the same;

[0026] The elastic component includes a sliding needle 3.1, a sliding sleeve 3.2 and a compression spring 3.3. The sliding needle 3.1 is fixed on the back of the sliding template 2, and the sliding sleeve 3.2 is fixed on the back of the fixed template 1. The sliding sleeve 3.2 is a hollow cylindrical structure. The sliding needle 3.1 slides in the sliding sleeve 3.2. The compression spring 3.3 is located between the sliding sleeve 3.2 and the sliding template 2 and is sleeved on the sliding needle 3.1. The limit block 4 is fixed on the fixed template 1. The limit block 4 allows the sliding needle 3.1 to slide within the elastic range of the compression spring 3.3. The limit block 4 is used to limit the position of the sliding template. The sliding sleeve 3.2 cooperates with the sliding needle 3.1 to limit the compression spring 3.3.

[0027] The sliding template 2 slides under the action of the compression spring 3.3, and the line connecting the centers of the arcs Ⅰ1.1 and Ⅱ2.1 is always parallel to the expansion and contraction direction of the compression spring 3.3. A rack 5 is installed on the sliding template 2, and the transmission direction of the rack 5 is parallel to the expansion and contraction direction of the compression spring 3.3.

[0028] The fixed template 1 is also provided with a fixed-axis gear train I6, a fixed-axis gear train II7, a pointer I8 and a pointer II9. The fixed-axis gear train I6 and the fixed-axis gear train II7 are both engaged with the rack 5. The pointer I8 and the pointer II9 are coaxially superimposed and arranged on the front side of the fixed template 1. The pointer I8 is linked with the fixed-axis gear train I6, and the pointer II9 is ​​linked with the fixed-axis gear train II7. The pointer I8 and the pointer II9 point to the arc edges of the fixed template 1 and the sliding template 2 respectively, so as to indicate the contact point of the steel ball on the raceway.

[0029] The fixed-axis gear train I6 includes two gears meshing with each other, and the fixed-axis gear train II7 includes three gears meshing with each other. The terminal output gears of the fixed-axis gear train I6 and the fixed-axis gear train II7 are stacked, and the terminal output gears of the fixed-axis gear train I6 and the fixed-axis gear train II7 rotate in opposite directions. The fixed-axis gear train I6 and the fixed-axis gear train II7 use gear transmission with a suitable transmission ratio, so that the angular displacement of the rack 5 output to the pointer I8 and the pointer II9 is ​​the same.

[0030] The relationship between the center offset of the arcs of the upper and lower raceways 13 and 14 and the change of the upper contact point A and the upper contact point A' is:

[0031] like Figures 6-8 As shown, the upper and lower raceway arc radii R and R′ of the raceway bearing 12 are the same, the upper raceway arc center is at the bottom, and the lower raceway arc center is at the top, and the upper and lower raceway arc radii are greater than the radius φ / 2 of the steel ball 15.

[0032] For example, the center offset of the arcs of the upper and lower raceways 13 and 14 of the standard raceway bearing 12 is 1.2 mm (e.g. Figure 6 ), the upper contact point A is the contact point between the steel ball 15 and the upper raceway 13, the lower contact point A' is the contact point between the steel ball 15 and the lower raceway 14, the central angle between the upper contact point A and the lower contact point A' is 90°, when the center offset of the upper and lower raceway arcs increases to 1.25mm (such as Figure 7 ), the center angle of the upper contact point A and the lower contact point A' increases to 95°, when the center offset of the arc of the upper and lower raceways 13 and 14 is reduced to 1.15mm (such as Figure 8 ), the central angle between the upper contact point A and the lower contact point A' is reduced to 85°.

[0033] The working principle of the detection device of the present invention during detection:

[0034] like Figures 9-11 As shown, first, the initial angle between the pointer I8 and the pointer II9 is ​​set to be the central angle between the standard raceway contact points. The sliding template 2 will slide under the action of the compression spring 3.3 according to the actual raceway shape. The sliding of the sliding template 2 will drive the pointer I8 and the pointer II9 to swing.

[0035] If the sliding template 2 moves toward the fixed template, that is, the center offset of the upper and lower raceway arcs increases, the angle between the pointer I8 and the pointer II9 will increase relative to the initial angle, indicating that the contact point moves outward;

[0036] The sliding template 2 moves away from the fixed template 1, that is, the center offset of the upper and lower raceway arcs becomes smaller, and the angle between the pointer I8 and the pointer II9 becomes smaller relative to the initial angle, indicating that the contact point moves inward.

[0037] The fixed template 1 and the sliding template 2 are provided with positioning bolts 10 and oblong holes 11. When the measurement is finished, the positioning bolts 10 are tightened to fix the sliding template 2 and save the measurement results.

[0038] The device can realize the output of the displacement of the sliding template 2 to the angle change of the pointer I8 and the pointer II9. The actual center offset of the raceway arc processed can be detected according to the actual change of the angle of the pointer I8 and the pointer II9. The direction of the pointer I8 and the pointer II9 reflects the theoretical contact point between the steel ball and the raceway.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A raceway shape and contact point detection device, characterized in that: It includes a fixed template and a sliding template, the fixed template and the sliding template are connected by an elastic component, and the fixed template and the sliding template are both provided with arc segments; The elastic component includes a sliding needle, a sliding sleeve and a compression spring, wherein the sliding needle is fixed on the sliding template, the sliding sleeve is fixed on the fixed template, the sliding needle is slidably arranged in the sliding sleeve, the compression spring is located between the sliding sleeve and the sliding template and is sleeved on the sliding needle, and the fixed template is provided with a limit block for limiting the position of the sliding template; A rack is installed on the sliding template, and the transmission direction of the rack is parallel to the expansion and contraction direction of the compression spring. A fixed-axis gear train I, a fixed-axis gear train II, a pointer I and a pointer II are also provided on the fixed template. The fixed-axis gear train I and the fixed-axis gear train II are both meshed with the rack, and the pointer I and the pointer II are coaxially superimposed and arranged on the front side of the fixed template. The pointer I is linked to the fixed-axis gear train I, and the pointer II is linked to the fixed-axis gear train II. The terminal output gears of the fixed-axis gear train I and the fixed-axis gear train II rotate in opposite directions.

2. The method according to claim 1, characterized in that: The fixed template and the sliding template are provided with positioning bolts and oblong holes.

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