Bearing eddy current flaw detection device

Abstract

The utility model relates to a bearing eddy current flaw detection device which comprises a workbench, a supporting seat for placing a bearing to be detected, two detection probes for detecting an inner ring and an outer ring of the bearing to be detected respectively, and a lifting mechanism for driving the two detection probes to lift up and down, the device is characterized in that the workbench is provided with two driven wheels which can be in rolling contact with the outer ring of the bearing to be detected on the supporting seat, the device also comprises a driving wheel located at one side of the supporting seat and a pinch roller located above the supporting seat, and the pinch roller is connected with a lifting mechanism and can move up and down. The pressing wheel can abut against the upper end face of the inner ring of the to-be-tested bearing on the supporting seat after moving downwards, and meanwhile a first driver for driving the driving wheel to rotate and a second driver for driving the driving wheel to be close to the outer ring of the to-be-tested bearing to make rolling contact with or be away from the to-be-tested bearing are arranged. By adopting the structure, the purposes of flaw detection of the inner ring and the outer ring and stable position in the bearing detection process can be achieved, and meanwhile, the integral structure is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of eddy current flaw detection device technical field, specifically refers to a kind of eddy current flaw detection device for detecting bearing. BACKGROUND

[0002] Bearing is a common mechanical component, it is generally composed of outer ring, inner ring, steel ball and retainer, in the production process, the outer ring, inner ring of assembled bearing needs to be detected to detect defects in bearing and timely reject. At present, the flaw detection has ultrasonic detection, ray detection and eddy current detection etc., wherein the eddy current detection is using electromagnetic induction principle, that is, when the probe with coil approaches the inner ring or outer ring of bearing, the alternating magnetic field around the coil produces induced current (eddy current) on the inner ring or outer ring, the induced current also produces eddy current magnetic field of same frequency, and its direction is opposite to the magnetic field direction of coil, the eddy current magnetic field is reflected to the coil of probe, changes the current size and phase of coil (i.e. coil impedance). According to this principle, when the probe moves relative to the surface of inner ring or outer ring, if there is defect or material, size etc. changes, the reaction of eddy current magnetic field to the coil in probe is different, thereby causing the change of coil impedance, and the change amount is measured by eddy current detection instrument, so as to judge whether there is defect or other physical property change on the surface of inner ring or outer ring.

[0003] According to the above principle, the structure of existing bearing eddy current flaw detection device is also diversified, it generally includes workbench, support disc for placing bearing in workbench, rotating lifting mechanism for driving support disc to rotate and lift, two detection probes for detecting inner ring and outer ring of bearing respectively and lifting mechanism for driving two detection probes to lift up and down, similar structure is disclosed in the documents with Chinese patent authorized publication number CN22176534U and Chinese patent authorized publication number CN214953230U.

[0004] And, in the above rotating process of support disc, in order to prevent the position of measured bearing from deviating, compression assembly (mainly including three positioning rollers) is often arranged, and the compression mechanism needs to cooperate with rotating lifting mechanism to limit the position of bearing. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem in view of the present situation of prior art, provides a kind of bearing eddy current flaw detection device, and the device can also complete the flaw detection of inner ring and outer ring of bearing, and can limit the position of bearing during detection process, and the overall structure is simpler.

[0006] The utility model discloses a technical scheme that solves the above technical problems: a bearing eddy current flaw detection device, including the workbench with main detection position, the support seat for placing the bearing to be detected at the main detection position, two detection probes for detecting the inner ring and the outer ring of the bearing to be detected respectively and the lifting mechanism for driving the up-down lifting of two detection probes, characterized in that: two driven wheels that can be in rolling contact with the outer ring of the bearing to be detected on the support seat are installed on the workbench, and a driving wheel is located on one side of the support seat and a compression wheel is located above the support seat, the compression wheel is connected with the lifting mechanism and can move up and down, the compression wheel can abut on the upper end face of the inner ring of the bearing to be detected on the support seat after moving down, and a first driver for driving the rotation of the driving wheel and a second driver for driving the driving wheel to approach the outer ring of the bearing to be detected and cause rolling contact or move away from the bearing to be detected are arranged.

[0007] In order to smoothly receive the bearing to be detected, preferably, a groove is opened at the main detection position, the support seat is seated in the groove, and the top surface of the support seat is not higher than the table surface of the workbench.

[0008] In the above preferred scheme, the support seat is a thrust bearing, and the outer ring of the bearing to be detected is placed on the thrust bearing. Alternatively, the support seat is a rotary disc, which is rotatably arranged in the groove through a vertical rotary shaft. In this way, when the bearing to be detected rotates, the support seat can rotate together to reduce the resistance when the bearing to be detected rotates.

[0009] In the above schemes, the lifting mechanism includes a lifting seat, a main lifting driver for driving the up-down movement of the lifting seat, a lifting rod vertically and slidingly inserted into the mounting hole of the lifting seat, and a spring for allowing the lifting rod to always have a downward tendency, and the compression wheel is installed at the lower end of the lifting rod to make the lifting flexible and simple in structure.

[0010] Further preferably, a guide hole and a guide rod parallel to the lifting rod and inserted into the guide hole are arranged on the lifting seat, the guide rod and the lifting rod are fixedly connected through a linkage block to ensure the stable up-down movement of the lifting rod.

[0011] In the above schemes, further improvement is that the workbench is further designed with a steel ball quantity detection position upstream of the main detection position, a steel ball detection mechanism for detecting the number of steel balls on the bearing at the steel ball quantity detection position is arranged above the steel ball quantity detection position, a first defective product removing position is further arranged on the workbench between the steel ball quantity detection position and the main detection position, a first lifting platform and a first lifting driver driving the first lifting platform to lift up and down are arranged at the first defective product removing position, a first material falling track with its material receiving port connected with the first lifting platform after lifting up and a first translation driver driving the bearing with insufficient steel balls on the first lifting platform to move into the first material falling track are arranged to ensure that the unqualified products are timely removed to avoid useless detection.

[0012] In order to prevent the bearing from falling, preferably, a first material blocking slope preventing the bearing from falling from the material receiving port of the first material falling track is arranged at the bottom of the material receiving port of the first material falling track.

[0013] Further improvement is that the workbench is further designed with a second defective product removing position downstream of the main detection position, a second lifting platform and a second lifting driver driving the second lifting platform to lift up and down are arranged at the second defective product removing position, a second material falling track with its material receiving port connected with the second lifting platform after lifting up and a second translation driver driving the defective bearing on the second lifting platform to move into the second material falling track are arranged to also timely remove the unqualified products after detection.

[0014] Similarly, in order to prevent the bearing from falling, a second material blocking slope preventing the bearing from falling from the material receiving port of the second material falling track is arranged at the bottom of the material receiving port of the second material falling track.

[0015] Compared with the prior art, since the two driven wheels in rolling contact with the outer ring and the driving wheel are adopted in the utility model, under the limiting of the three wheels, the bearing to be detected will not move in position during detection, and can rotate the outer ring under the driving of the driving wheel, so that the purpose of eddy current detection of the outer ring is achieved; meanwhile, the inner ring is lowered and the friction between the inner ring and the outer ring is increased by the steel balls, so that the inner ring can rotate together with the outer ring when the outer ring rotates, and the eddy current detection of the inner ring is achieved. Therefore, the utility model can also achieve the purpose of stable detection of the inner and outer rings, and has the characteristics of simple overall structure. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a three-dimensional schematic view of an embodiment of the utility model;

[0017] Figure 2 is Figure 1 another direction schematic view of the utility model;

[0018] Figure 3for Figure 2 Enlarged schematic diagram of section I;

[0019] Figure 4 for Figure 1 A three-dimensional sectional view (after removing the spring);

[0020] Figure 5 for Figure 1 A three-dimensional schematic diagram of components such as robotic arms. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] In the following description of the embodiments, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "axial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0023] like Figures 1 to 5 As shown, the bearing eddy current flaw detection device includes a worktable 1, a support base 2a, two detection probes 3, a lifting mechanism 4, two driven wheels 5a, a clamping wheel 5b, and a first driver 6a and a second driver 6b. The worktable 1 has a main detection position with a groove 11. The support base 2a sits in this groove 11, and its top surface is not higher than the worktable 1. The support base 2a can be a thrust bearing, on which the outer ring of the bearing to be tested rests. Alternatively, the support base 2a can be a turntable, rotatably mounted in the groove 11 via a vertical shaft. The worktable 1 is also equipped with four robotic arms 10, distributed equidistantly to correspond to each workstation. Each robotic arm is connected via a long strip 02 to the piston rod of a pusher cylinder 01 (three pusher cylinders 01 are shown in the figure, which can operate synchronously to ensure the robotic arms can extend and retract freely). See details in [link to details]. Figure 1 and Figure 5The piston rod of the pushing cylinder 01 is vertically oriented along the moving path of the bearing, the pushing cylinder 01 is fixed on the material carrier 03 respectively, the material carrier 03 slides on the slide rail 07 which is parallel to the long strip 02 and is connected with the piston rod of the pushing cylinder 04, the piston rod of the pushing cylinder 04 moves back and forth along the moving path of the bearing, so that the mechanical arm 10 moves back and forth along the moving path of the bearing and the pushing cylinder 01 expands and contracts, the bearing is moved to the support seat 2a and the following working position as required. The mechanical arm can also be other structure in the prior art, which will not be described here.

[0024] The two detection probes 3 are used to detect the inner ring and the outer ring of the bearing to be detected, so they correspond to the inner ring and the outer ring of the bearing respectively, and are connected with the lifting mechanism 4 to realize synchronous lifting as in the prior art. In this embodiment, the lifting mechanism 4 includes a lifting seat 41, a main lifting driver 42 for driving the lifting seat 41 to move up and down, and two detection rods 43 fixed on the lifting seat 41, the two detection probes 3 are fixed on the lower end of the detection rod 43 respectively, and the main lifting driver 42 is preferably a main cylinder, and the lifting seat 41 is fixed on the piston rod of the main cylinder. Of course, other lifting mechanisms in the prior art can also be used. Here, it will not be described.

[0025] The two driven wheels 5a are rotatably installed on the pivot which is supported on the workbench 1, and are spaced apart along the circumference of the support seat 2a and can be in rolling contact with the outer ring of the bearing to be detected on the support seat 2a respectively. See Figure 3 Meanwhile, a driving wheel 5c is also provided beside the support seat 2a, the first driver 6a is used to drive the driving wheel 5c to rotate, and the second driver 6b is used to drive the driving wheel 5c to be in rolling contact with the outer ring of the bearing to be detected or to drive the driving wheel 5c to move away from the bearing to be detected. The first driver 6a can be a motor which is arranged on a mounting seat 05, and the driving wheel 5c is installed on the output shaft of the motor. The second driver 6b can be a cylinder, and the mounting seat 05 is fixed on the piston rod of the cylinder, so that the driving wheel 5c can be close to the bearing to be detected on the support seat 2a and make the driving wheel 5c push the bearing to be detected to move slightly, and then make the bearing to be detected contact with the two driven wheels 5a, that is, the driving wheel 5c and the two driven wheels 5a need to work together to position the bearing to be detected at the required main detection position, and then the first driver 6a is actuated, and then the driving wheel 5c starts to rotate, and the outer ring rotates together under the limiting action of the two driven wheels 5a. Obviously, at this time, the two driven wheels 5a and the driving wheel 5c not only realize the purpose of limiting the position of the bearing to be detected, but also play the role of rotating the bearing to be detected.

[0026] Since the inner ring needs to be detected at the same time, the inner ring, due to the existence of the clearance and the lubricating oil, may not be able to rotate synchronously with the outer ring. Therefore, the embodiment ingeniously adds the above-mentioned pressing wheel 5b, which is located above the support seat 2a and is connected with the above-mentioned lifting mechanism 4 and can move up and down. The pressing wheel 5b can abut on the inner ring of the bearing to be detected on the support seat 2a after moving down, so that the inner ring moves down and is pressed on the outer ring by the steel ball to increase the friction between them. In this way, the inner ring can be smoothly rotated together with the outer ring by the steel ball during the rotation of the outer ring, so as to achieve the purpose of detecting the inner ring at the same time.

[0027] In order to prevent the pressing wheel 5b from pressing the end face of the inner ring when it moves down, in the embodiment, a mounting hole is further formed in the above-mentioned lifting seat 41, a lifting rod 44 is vertically and slidingly inserted in the mounting hole, and the pressing wheel 5b is mounted at the lower end of the lifting rod 44. A spring 45 is arranged to always have a downward tendency of the lifting rod. Specifically, the spring 45 is sleeved on the lifting rod 44, the upper end of the spring 45 abuts on the lifting seat 41, and the lower end abuts on a positioning block fixed on the lifting rod 44. In order to consider the stability of the lifting rod 44 in lifting up and down, a guide hole is formed in the lifting seat 41, and a guide rod 46 parallel to the lifting rod 44 is inserted in the guide hole. The guide rod 46 and the lifting rod 44 are fixedly connected through a linkage block 47 to play a guiding role.

[0028] When the above-mentioned main lifting driver 42 is actuated to drive the two detection probes 3 to move down, the pressing wheel 5b moves down synchronously. When the pressing wheel 5b abuts on the upper end face of the inner ring, the two detection probes 3 continue to move down. At this time, the lifting rod 44 does not move, and the spring 45 is compressed (the lifting rod rises relative to the lifting seat) with the downward movement of the lifting seat 41, thereby effectively avoiding the occurrence of the pressing injury phenomenon of the bearing to be detected.

[0029] Because the number of steel balls assembled during bearing assembly may be inaccurate, to avoid ineffective eddy current testing, a steel ball quantity detection position is designed on the workbench 1 above the main detection position. Above this steel ball quantity detection position is a steel ball detection mechanism 06 for detecting the number of steel balls in the bearings at the steel ball quantity detection position. The steel ball detection mechanism 06 is existing technology and will not be described in detail here. At the same time, a first rejection position is set on the workbench between the steel ball quantity detection position and the main detection position. At the first rejection position, a first lifting platform 2b and a first lifting driver 7a that drives the first lifting platform 2b to move up and down are set. A first dropping rail 8a and a first translation driver 9a are configured so that the receiving port of the first lifting platform 2b is connected to the first lifting platform 2b after it is raised. The first translation driver 9a can move the bearings on the first lifting platform 2b that are missing steel balls into the first dropping rail 8a. Here, the first lifting driver 7a and the first translation driver 9a are preferably cylinders. The first translation driver 9a is mounted on the aforementioned long strip 02 and moves together. Of course, it can also be installed on a workbench that avoids the movement of robotic arm 10, long strip 02, etc.

[0030] To prevent the bearings entering the first discharge rail 8a from falling off, a first retaining slope is also provided at the bottom of the receiving port of the first discharge rail 8a (not shown in the figure, see details). Figure 1 (The part indicated by reference numeral 81b) When the first unloading rail 8a tilts due to manufacturing or assembly errors, the first retaining slope can be used to prevent the bearing from falling out of the receiving port of the first receiving rail, while still ensuring that the bearing can smoothly enter the first unloading rail 8a under the push of the first translation driver 9a.

[0031] In addition, in this embodiment, the workbench 1 is also designed with a second rejection position located downstream of the main inspection position, so that unqualified bearings can be rejected in time during eddy current flaw detection. Specifically, a second lifting platform 2c and a second lifting driver 7b that drives the second lifting platform 2c to move up and down are provided at the second rejection position. Similarly, a second dropping rail 8b whose receiving port connects with the raised second lifting platform 2c and a second translation driver 9b are also provided. The second translation driver 9b can move the defective bearings on the second lifting platform 2c into the second dropping rail 8b. Here, the second lifting driver 7b and the second translation driver 9b are preferably cylinders, and the second translation driver 9b is also mounted on the aforementioned long strip 02 and moves together. Similarly, when necessary, it can also be mounted on a workbench that avoids the movement of the robot arm 10, the long strip 02, etc.

[0032] Similarly, in order to prevent the bearings entering the second chute 8b from falling, a second bearing stop 81b is provided at the bottom of the receiving opening of the second chute 8b, so that when the second chute 8b is tilted due to manufacturing or assembly errors, the second bearing stop 81b prevents the bearings from falling out of the receiving opening of the second chute 8b.

Claims

1. A bearing eddy current testing device, comprising a worktable (1) having a main testing position, a supporting seat (2a) for placing a bearing to be tested at the main testing position, two testing probes (3) for testing an inner ring and an outer ring of the bearing to be tested respectively, and a lifting mechanism (4) for driving the two testing probes (3) to lift up and down, characterized in that: Two driven wheels (5a) are installed on the workbench (1) and can be in rolling contact with the outer ring of the bearing to be tested on the support seat (2a), and a driving wheel (5c) is arranged on one side of the support seat (2a) and a pressing wheel (5b) is arranged above the support seat (2a), the pressing wheel (5b) is connected with the lifting mechanism (4) and can move up and down, the pressing wheel (5b) can abut on the upper end face of the inner ring of the bearing to be tested on the support seat (2a) after moving down, and a first driver (6a) is arranged to drive the driving wheel to rotate, and a second driver (6b) is arranged to drive the driving wheel to approach the outer ring of the bearing to be tested and be in rolling contact or move away from the bearing to be tested.

2. The bearing eddy current inspection apparatus of claim 1, wherein: A groove (11) is opened at the main detection position, the support seat (2a) is located in the groove, and the top surface of the support seat (2a) is not higher than the table top of the workbench (1).

3. The bearing eddy current inspection apparatus of claim 2, wherein: The support seat (2a) is a thrust bearing, and the outer ring of the bearing to be tested is placed on the thrust bearing.

4. The bearing eddy current inspection apparatus of claim 2, wherein: The support seat (2a) is a rotating disc which is rotatably arranged in the groove (11) through a vertical rotating shaft.

5. The bearing eddy current inspection apparatus of claim 1, wherein: The lifting mechanism (4) comprises a lifting seat (41), a main lifting driver (42) for driving the lifting seat to move up and down, a lifting rod (44) which is vertically and slidingly inserted into a mounting hole of the lifting seat, and a spring (45) for allowing the lifting rod to always have a downward tendency, and the pressing wheel (5b) is mounted at the lower end of the lifting rod (44).

6. The bearing eddy current inspection apparatus of claim 5, wherein: The lifting seat (41) is further provided with a guide hole and a guide rod (46) which is inserted into the guide hole and is parallelly distributed with the lifting rod (44), and the guide rod and the lifting rod are fixedly connected through a linkage block (47).

7. A bearing eddy current inspection apparatus according to any one of claims 1 to 6, wherein: The workbench (1) is further designed with a steel ball quantity detection position upstream of the main detection position, a steel ball detection mechanism (06) is arranged above the steel ball quantity detection position for detecting the number of steel balls on the bearing at the steel ball quantity detection position, a first defective product removal position is further arranged on the workbench between the steel ball quantity detection position and the main detection position, a first lifting table (2b) and a first lifting driver (7a) for driving the first lifting table (2b) to move up and down are arranged at the first defective product removal position, a first material falling rail (8a) is arranged and the material receiving port of the first material falling rail (8a) is connected with the first lifting table (2b) after being lifted, and a first translation driver (9a) is arranged to drive the bearing with insufficient steel balls on the first lifting table (2b) to move into the first material falling rail (8a).

8. The bearing eddy current inspection apparatus of claim 7, wherein: A first material blocking slope is arranged at the bottom of the material receiving port of the first material falling rail (8a) to prevent the bearing from falling from the material receiving port of the first material falling rail (8a).

9. The bearing eddy current inspection apparatus of claim 7, wherein: The workbench (1) is further designed with a second defective product removing position downstream of the main detecting position, a second lifting platform (2c) and a second lifting driver (7b) driving the second lifting platform (2c) to lift up and down are arranged at the second defective product removing position, and a second material falling rail (8b) with its material receiving port connected with the second lifting platform (2c) after being lifted up and a second translation driver (9b) driving the second defective product bearing on the second lifting platform (2c) to move into the second material falling rail (8b) are further arranged.

10. The bearing eddy current inspection apparatus of claim 9, wherein: A second material blocking slope (81b) preventing the bearing from falling off the material receiving port of the second material falling rail (8b) is arranged at the bottom of the material receiving port of the second material falling rail (8b).

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