Loading device

Abstract

The invention relates to the technical field of bearing testing, in particular to a loading device which comprises an installation frame, the installation frame comprises a support and a loaded head, the support is provided with a loading head, the loading head comprises a connecting part connected with the support and a loading part making contact with a bearing to be tested or an installation part used for installing a force sensor, and the loading part is connected with the support. The connecting part is adjustably connected with the adjusting part in the loading direction, and the loading part or the mounting part used for mounting the force sensor is fixedly connected with the adjusting part. Therefore, the loading part or the mounting part can move up and down in the loading direction through the adjusting part, so as to ensure that the height of the loading part or the mounting part of the loading head is consistent, and prevent the outer ring of the to-be-measured bearing from inclining to cause the clamping stagnation of the retainer of the to-be-measured bearing in the measurement process. A contact angle measurement result has a large deviation.

Description

Technical Field

[0001] The invention relates to the technical field of bearing testing, and in particular to a loading device. Background Art

[0002] Angular contact ball bearings can bear both axial loads and radial loads, so they are widely used in situations where they bear combined radial and axial loads or axial loads. The contact angle is a very important parameter for angular contact ball bearings. The load-bearing capacity of angular contact ball bearings is determined by the size of the contact angle. The larger the contact angle, the greater the axial load-bearing capacity of the angular contact ball bearing. Therefore, it is particularly important to accurately and effectively detect and evaluate the contact angle.

[0003] The contact angle of angular contact ball bearings is usually tested using a special contact angle measuring instrument. During the test, the inner ring of the bearing is installed on the mandrel of the contact angle measuring instrument. In order to prevent the roller from slipping during the contact angle measurement and causing errors in the contact angle measurement, a certain load needs to be applied during the measurement.

[0004] The outer ring of the bearing is fixed by the axial load applied by the loading device of the contact angle meter. The spindle of the contact angle meter drives the inner ring, roller and cage of the bearing to rotate through the power provided by the motor. The measured value of the bearing contact angle can be obtained by calculating the ratio of the number of rotations of the bearing cage to the number of rotations of the inner ring.

[0005] The loading device of the existing contact angle measuring instrument usually adopts a three-point loading method to apply load to the outer ring of the bearing, so as to fix the outer ring. However, in the actual measurement process, since the loading heads on the loading device are installed on the same mounting frame and the height of the loading heads is fixed, when one or two of the loading heads are worn, the height of the loading parts of the three loading heads will be inconsistent, which will cause the axial force applied to the outer ring of the bearing to be unbalanced, and the outer ring of the bearing will be tilted, which will cause the cage to get stuck during the measurement process, and the contact angle measurement result will have a large deviation. Summary of the invention

[0006] The object of the present invention is to provide a loading device for solving the problem that the loading force of the loading device of the contact angle measuring instrument in the prior art is unbalanced, the outer ring of the bearing to be measured will be tilted, and then the retaining frame of the bearing to be measured will be stuck during the measurement process, resulting in a large deviation in the contact angle measurement result.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0008] A loading device comprises a mounting frame, wherein the mounting frame comprises a bracket and a load-bearing head, a loading head is mounted on the bracket, the loading head comprises a connecting portion connected to the bracket, and a loading portion in contact with a bearing to be tested or a mounting portion for mounting a force sensor, the loading head also comprises an adjusting portion, the adjusting portion is adjustably connected to the connecting portion in a loading direction, and the loading portion or the mounting portion for mounting the force sensor is fixedly connected to the adjusting portion.

[0009] Furthermore, the mounting frame is a star-shaped frame in which the bracket extends radially outward from the loading head, and the loading head and the bracket are adjustably connected in the length direction of the bracket.

[0010] Furthermore, the bracket is provided with a slide groove extending along its length direction, and the slide groove passes through the bracket in the loading direction. The loading head includes an upper clamping plate and a lower clamping plate. The width of the upper and lower clamping plates is greater than the width of the slide groove. The upper clamping plate and the lower clamping plate are connected and installed on the bracket by fixing bolts. The upper clamping plate, the lower clamping plate and the fixing bolts constitute the connecting part, and the fixing bolts pass through the slide groove.

[0011] Furthermore, a threaded hole is provided on the upper clamping plate, and the loading head further comprises an adjusting bolt, which is threadedly matched with the threaded hole to form the adjusting part, and the adjusting bolt is located beside the lower clamping plate or passes through the lower clamping plate.

[0012] Furthermore, two lower clamping plates are provided, the lower clamping plates include a bottom plate, the two lower clamping plates are arranged on the bracket along the length direction of the bracket, and the adjusting bolt passes through the slide slot and extends out from the gap between the two lower clamping plates.

[0013] Furthermore, the lower clamping plate also includes a column arranged on the bottom plate, the column extends toward the upper clamping plate, the column height is greater than the thickness of the bracket, the column width is less than the width of the bracket slide slot, the column is in the slide slot and the upper end is against the upper clamping plate.

[0014] Furthermore, an anti-slip pad is provided between the upper surface of the bottom plate of the lower clamping plate and / or the lower surface of the bracket.

[0015] Furthermore, the anti-slip pad is adhered to the upper surface of the bottom plate of the lower clamping plate.

[0016] Furthermore, the anti-slip pad is a rubber pad.

[0017] Furthermore, a threaded section is provided at the lower end of the adjusting bolt, constituting the mounting portion for mounting the force sensor.

[0018] The above technical solution has the following beneficial effects: the present invention proposes a loading device in an improved manner, including a mounting frame, the mounting frame including a bracket and a load-bearing head, a loading head installed on the bracket, the loading head including a connecting portion connected to the bracket, and a loading portion in contact with the bearing to be tested or a mounting portion for installing a force sensor, the loading portion or the mounting portion for installing the force sensor is fixedly connected to the adjusting portion by an adjustable connecting portion in the loading direction. In this way, the loading portion or the mounting portion can be moved up and down in the loading direction through the adjusting portion to ensure that the loading portion or the mounting portion of the loading head is highly consistent, to prevent the outer ring of the bearing to be tested from tilting, which will cause the retainer of the bearing to be tested to get stuck during the measurement process, and the contact angle measurement result will have a large deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a loading device of the present invention; Figure 2 A schematic structural diagram of an embodiment of a loading head of a loading device of the present invention; Figure 3 It is a schematic diagram of the installation of the loading device of the present invention for axially loading the bearing to be tested; Figure 4 It is a structural schematic diagram of the lower clamping plate of the loading head of the loading device of the present invention; Figure 5 It is a structural schematic diagram of another embodiment of the loading head of the loading device of the present invention.

[0020] In the figure: 1, mounting frame; 11, load-bearing head; 12, bracket; 2, loading head; 3, bearing to be tested; 201, upper clamping plate; 202, lower clamping plate; 203, fixing bolt; 204, adjusting bolt; 205, rubber pad; 206, force sensor; 212, lower clamping plate bottom plate; 222, lower clamping plate column; 30, rack; 31, rack mounting slot; 32, knob. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] The present invention proposes a loading device, including a mounting frame, the mounting frame including a bracket and a load-bearing head, a loading head installed on the bracket, the loading head including a connecting portion connected to the bracket, and a loading portion in contact with the bearing to be tested or a mounting portion for installing a force sensor, the loading portion or the mounting portion for installing the force sensor is fixedly connected to the adjusting portion by an adjustable connecting portion in the loading direction. In this way, the loading portion or the mounting portion can be moved up and down in the loading direction through the adjusting portion to ensure that the loading portion or the mounting portion of the loading head is highly consistent, to prevent the outer ring of the bearing to be tested from tilting, which will cause the retainer of the bearing to be tested to get stuck during the measurement process, and the contact angle measurement result will have a large deviation.

[0023] Based on the above concepts, the present invention provides a variety of different loading device embodiments for illustration.

[0024] In a basic embodiment, Figure 1 As shown, the loading device includes a mounting frame 1, and the mounting frame 1 includes a load head 11 and a bracket 12. The load head 11 is used to bear the external total load. A loading head 2 is installed on the bracket 12. The loading head 2 includes a connecting part connected to the bracket 12 and a loading part in contact with the bearing 3 to be tested or a mounting part for installing the force sensor 206. The loading head 2 also includes an adjusting part. The adjusting part is adjustably connected to the connecting part in the loading direction. The loading part or the mounting part for installing the force sensor 206 is fixedly connected to the adjusting part. The loading part or the mounting part can be adjusted up and down in the loading direction through the adjusting part. In this way, the loading part or the mounting part can be moved up and down in the loading direction through the adjusting part to prevent the outer ring of the bearing to be tested from tilting, which will cause the retaining frame of the bearing to be tested to get stuck during the measurement process, and a large deviation will occur in the contact angle measurement result.

[0025] In the above embodiment, the mounting frame 1 is a star-shaped frame in which the brackets 12 extend radially outward from the loading head 11, and the loading head 2 and the brackets 12 are adjustably connected in the length direction of the brackets 12. The mounting frame 1 includes a plurality of brackets 12 evenly distributed in the circumferential direction. This ensures that when a plurality of loading heads 2 are in the same circumference, the loading head 11 is subjected to force, and the component force on each bracket 12 is consistent.

[0026] Based on the above embodiment, the mounting frame 1 can be provided with five brackets 12 or eight brackets 12. In a preferred embodiment, as Figure 1 As shown, the mounting frame 1 is provided with three brackets 12 evenly distributed in the circumferential direction, so that the loading device can be stably loaded while the structure of the loading device is simple.

[0027] On the basis of the above embodiment, the bracket 12 is configured as a rectangular rod, and the loading head 2 is adjustably connected to the bracket 12 in the length direction of the bracket 12. Preferably, a slide groove extending along the length direction is provided on the bracket 12, the slide groove passes through the bracket 12 in the loading direction, and the loading head 2 is installed in the slide groove, so that the loading head 2 can be moved without being completely removed when it needs to be moved.

[0028] On the basis of the above embodiment, the loading head 2 includes a U-shaped plate, which is sleeved on the bracket 12, and the two opposite sides of the U-shaped plate are respectively located on the upper side and the lower side of the bracket 12, one side of the U-shaped plate is in contact with one side of the bracket 12, and the fixing bolts pass through the openings on the opposite sides of the U-shaped plate so that the loading head 2 is installed on the bracket 12, and the adjusting bolts pass through the slide groove on the bracket 12. In a preferred embodiment, as Figure 1-2 As shown, the loading head 2 includes an upper clamping plate 201 and a lower clamping plate 202, the width of the upper clamping plate 201 and the lower clamping plate 202 is greater than the width of the slide groove, the upper clamping plate 201 and the lower clamping plate 202 are connected by a fixing bolt 203, the upper clamping plate 201, the lower clamping plate 202 and the fixing bolt 203 together constitute the connecting part of the loading head 2, which is installed on the bracket 12, and the fixing bolt 203 passes through the slide groove on the bracket 12. Such an arrangement can prevent the loading head 2 from shaking on the bracket 12, resulting in inconsistent height of the loading head 2.

[0029] Based on the above embodiments, Figure 5 As shown, the adjustment part of the loading head 2 can be set as a gear rack mechanism, the rack 30 passes through the upper clamping plate 201 and the lower clamping plate 202 of the loading head 2, and a gear meshing with the rack 30 is rotatably installed in the rack insertion groove 31 on the upper clamping plate 201. The gear is connected to the knob 32 on the outside of the upper clamping plate 201. The rotation of the gear is achieved by operating the knob 32, thereby driving the rack 30 to move up and down. A locking mechanism is also provided at the gear rack mechanism, and the locking mechanism includes a top screw threaded on the upper clamping plate 201, and the top screw is on the side of the upper clamping plate 201 opposite to the knob 32. After the rack is adjusted to a certain position, the rack can be pressed by the top screw to prevent the rack from moving. In a preferred embodiment, as Figure 2 As shown, a threaded hole is opened on the upper clamping plate 201, and the loading head 2 also includes an adjusting bolt 204. The adjusting bolt 204 and the threaded hole threadably cooperate to form an adjusting part. The adjusting bolt 204 is located beside the lower clamping plate 202 or passes through the lower clamping plate 202. In this way, the loading part can be moved up and down by screwing the adjusting bolt 204. The structure is relatively simple and easy to operate.

[0030] On the basis of the above embodiment, the lower clamping plate 202 of the loading head 2 can be provided with one, so that the loading head 2 can also be installed on the bracket 12. In a preferred embodiment, as Figure 2As shown, two lower clamps 202 are provided, and the lower clamps 202 include a lower clamp bottom plate 212. The two lower clamps 202 are arranged on the bracket 12 along the length direction of the bracket 12. The adjusting bolt 204 passes through the slide groove and extends from the gap between the two lower clamps 202, so as to further prevent the loading head 2 from shaking on the bracket 12.

[0031] In one embodiment, the lower clamping plate 202 is provided with a lower clamping plate base plate 212, and the upper clamping plate 201 and the lower clamping plate 202 of the loading head 2 are connected by fixing bolts 203 to clamp the bracket 12. When the loading head 2 is moved on the bracket 12, the fixing bolts 203 need to be loosened to move the loading head 2.

[0032] In a preferred embodiment, Figure 4 As shown, the lower clamping plate 202 also includes a lower clamping plate column 222 arranged on the lower clamping plate bottom plate 212, and the lower clamping plate column 222 extends toward the upper clamping plate 201. The height of the lower clamping plate column 222 is greater than the thickness of the bracket 12, so as to achieve the limitation between the upper clamping plate 201 and the lower clamping plate 202. The width of the lower clamping plate column 222 is less than the width of the slide groove of the bracket 12. The lower clamping plate column 222 is in the slide groove and the upper end is against the upper clamping plate 201. In this way, when no load is applied, the distance between the upper clamping plate 201 and the lower clamping plate 202 of the loading head 2 is greater than the thickness of the bracket 12, so that the loading head 2 can be moved on the bracket 12 for workpieces of different sizes.

[0033] On the basis of the above embodiment, the upper clamping plate 201 and the lower clamping plate 202 of the loading head 2 can directly contact the upper and lower surfaces of the bracket 12. In a preferred embodiment, an anti-skid pad is also adhered between the upper surface of the bottom plate of the lower clamping plate 202 and the lower surface of the bracket 12. The anti-skid pad can be set on the upper surface of the bottom plate of the lower clamping plate 202 or the lower surface of the bracket 12, so that the friction between the loading head 2 and the bracket 12 can be increased, so that the loading head 2 will not be displaced during loading.

[0034] In the above embodiment, a felt pad or a plastic pad can be selected as the anti-slip pad. Preferably, Figure 2 As shown, a rubber pad 205 is also provided on the upper surface of the lower clamping plate bottom plate 212 of the loading head 2.

[0035] On the basis of the above embodiment, the lower end of the adjusting bolt 204 on the loading head 2 directly contacts the outer ring of the bearing 3 to be tested, and the loading force is directly transmitted from the adjusting bolt 204 to the outer ring of the bearing 3 to be tested. In a preferred embodiment, Figure 2-3As shown, a threaded section is provided at the lower end of the adjusting bolt 204, and the threaded section constitutes an installation part for installing the force sensor 206. A threaded hole that cooperates with the lower end thread of the adjusting bolt 204 is provided on the upper end surface of the force sensor 206. The force sensor 206 can directly display the magnitude of the loading force. The force sensor 206 contacts the outer ring end surface of the bearing 3 to be tested, thereby transmitting the loading force to the outer ring of the bearing 3 to be tested. In this way, the height of the adjusting bolt 204 of the loading head 2 can be easily adjusted to make the magnitude of the loading force at each point consistent.

[0036] When using the loading device of the present invention, first adjust the position of the loading head 2 on the bracket 12, such as Figure 3 As shown, the center of the loading head 2 is located directly above the outer ring end face of the bearing 3 to be tested. During loading, the loading head 11 of the mounting frame 1 is loaded, and the mounting frame 1 moves downward as a whole until the lower end of the force sensor 206 on the loading head 2 contacts the outer ring end face of the bearing 3 to be tested and does not interfere with the inner ring of the bearing 3 to be tested.

[0037] According to the measured force indication displayed by the force sensor 206 at the lower end of the loading head 2, the height of the adjusting bolt 204 where the loading head 2 with the smallest indication is located is adjusted so that its indication is equal to the indication of the loading head 2 with the middle indication, and the height of the adjusting bolt 204 where the loading head 2 with the largest indication is located is adjusted so that its indication is equal to the indications of the other two loading heads 2, thereby completing the force balance of the three loading heads 2, that is, the lower ends of the three loading heads 2 are at the same horizontal height.

[0038] By using the loading device of the present invention in a contact angle measuring instrument, the axial force applied to the bearing 3 to be measured can be made consistent during measurement, so that the outer ring of the bearing 3 to be measured will not be deflected, thereby preventing the retaining frame of the bearing 3 to be measured from getting stuck, and greatly improving the accuracy of contact angle measurement.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A loading device, comprising a mounting frame, the mounting frame comprising a bracket and a load-receiving head, a loading head being mounted on the bracket, the loading head comprising a connecting portion connected to the bracket, and a loading portion contacting a bearing to be tested or a mounting portion for mounting a force sensor, characterized in that: The loading head further comprises an adjusting part, which is adjustably connected to the connecting part in the loading direction, and the loading part or the mounting part for mounting the force sensor is fixedly connected to the adjusting part.

2. The loading device according to claim 1, characterized in that: The mounting frame is a star-shaped frame in which the bracket radiates outward from the loading head, and the loading head and the bracket are adjustably connected in the length direction of the bracket.

3. The loading device according to claim 2, characterized in that: The bracket is provided with a slide groove extending along its length direction, and the slide groove passes through the bracket in the loading direction. The loading head includes an upper clamping plate and a lower clamping plate. The width of the upper and lower clamping plates is greater than the width of the slide groove. The upper clamping plate and the lower clamping plate are connected and installed on the bracket by fixing bolts. The upper clamping plate, the lower clamping plate and the fixing bolts constitute the connecting part, and the fixing bolts pass through the slide groove.

4. The loading device according to claim 3, characterized in that: The upper clamping plate is provided with a threaded hole, and the loading head further comprises an adjusting bolt, which is threadedly matched with the threaded hole to form the adjusting part, and the adjusting bolt is located beside the lower clamping plate or passes through the lower clamping plate.

5. The loading device according to claim 4, characterized in that: Two lower clamping plates are provided, the lower clamping plates include a bottom plate, the two lower clamping plates are arranged on the bracket along the length direction of the bracket, and the adjusting bolt passes through the sliding groove and extends out from the interval between the two lower clamping plates.

6. The loading device according to claim 5, characterized in that: The lower clamping plate also includes a column arranged on the bottom plate, the column extends toward the upper clamping plate, the column height is greater than the thickness of the bracket, the column width is less than the width of the bracket slide slot, the column is in the slide slot and the upper end is against the upper clamping plate.

7. The loading device according to claim 6, characterized in that: An anti-skid pad is also provided between the upper surface of the bottom plate of the lower clamping plate and / or the lower surface of the bracket.

8. The loading device according to claim 7, characterized in that: The anti-skid pad is adhered to the upper surface of the bottom plate of the lower clamping plate.

9. The loading device according to claim 7, characterized in that: The anti-slip pad is a rubber pad.

10. The loading device according to any one of claims 4 to 9, characterized in that: The lower end of the adjusting bolt is provided with a threaded section, which constitutes the mounting part for mounting the force sensor.

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