Bearing ring defect detection device

Abstract

The utility model relates to the technical field of bearing ring detection, in particular to a bearing ring defect detection device. Comprising a platform assembly, a clamping assembly, a power assembly, a first collecting assembly and a second collecting assembly, the platform assembly comprises a detection platform and a bearing ring, the clamping assembly comprises a mounting block, the power assembly comprises a first motor and a first linkage shaft, and the output end of the first motor is connected with a rotating shaft; the end, away from the first motor, of the rotating shaft is connected with a transmission gear, and a driven gear is arranged on the outer ring of the first linkage shaft. After the second collecting ring descends to be attached to the top of the detection platform, the bearing ring is driven by the power assembly to periodically and circumferentially rotate, in the process, a second camera collects images of the surface of the outer ring of the bearing ring, and second light sources are symmetrically arranged at the two ends of the second camera and used for guaranteeing the definition of image collection.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing ring detection, in particular to a bearing ring defect detection device. Background Art

[0002] Common bearings are mainly composed of balls, bearing rings and retaining frames. Among them, the bearing rings include a bearing inner ring with a raceway on the inner ring surface and a bearing outer ring with a raceway on the outer ring surface. They are shaped like a hollow sleeve structure and mainly have four surfaces, namely the inner ring surface, outer ring surface, upper end face and lower end face.

[0003] Bearing rings are one of the key components used to support and position bearings. Their quality and integrity are crucial to the proper functioning of bearings. Therefore, inspecting bearing rings for defects is a crucial step in ensuring bearing performance and reliability. Defects in bearing rings can include cracks, deformation, and wear, which can lead to bearing failure and equipment malfunction.

[0004] The existing patent document CN 220542804 U discloses a bearing ring defect detection device, comprising a group of support components, a group of baffles provided above the support components, a conveyor belt component connected between the baffles via bearings, a first power component provided on one side of the baffle, the first power component being transmission-connected to the conveyor belt component, and a rack provided on the baffle; the bearing ring defect detection device cannot perform comprehensive inspection of the inner and outer ring surfaces of the bearing ring, affecting the inspection efficiency. Utility Model Content

[0005] In response to the above problems, the purpose of the present utility model is to provide a bearing ring defect detection device to solve the problem that it is impossible to fully detect the inner ring surface and outer ring surface of the bearing ring, which affects the detection efficiency. The first camera realizes the acquisition of the image of the inner ring surface of the bearing ring, and the second camera realizes the acquisition of the image of the outer ring surface of the bearing ring.

[0006] To achieve the above objectives, the utility model adopts the following technical solution: a bearing ring defect detection device, comprising a platform assembly, a clamping assembly, a power assembly, a first collection assembly, and a second collection assembly, the platform assembly comprising a detection platform and a bearing ring, the clamping assembly comprising a mounting block, the power assembly comprising a first motor and a first linkage shaft, the first collection assembly comprising a top plate and a second motor, the second collection assembly comprising a fourth electric push rod, the output end of the first motor being connected to a rotating shaft, the end of the rotating shaft away from the first motor being connected to a transmission gear, the outer ring of the first linkage shaft being provided with a driven gear, the top of the first linkage shaft being connected to the first electric push rod, the output end of the first electric push rod being connected to a lifting column, a layer plate inner groove being provided on the inner side of the top plate, a second linkage shaft being provided on the inner side of the layer plate inner groove, the lower end of the second linkage shaft being connected to the second electric push rod, the output end of the second electric push rod being connected to the first collection ring, and the output end of the fourth electric push rod being connected to the second collection ring.

[0007] The beneficial effects of the present invention are as follows: when the second acquisition ring descends to fit with the top of the detection platform, the bearing ring performs periodic circular rotation driven by the power component, and during this process, the second camera realizes the acquisition of the surface image of the outer ring of the bearing ring. By symmetrically arranging the second light source at both ends of the second camera, the clarity of the image acquisition is ensured. After completing the clamping of the outer ring of the bearing ring, the second electric push rod is started, the second electric push rod works and drives the first acquisition ring to descend, and then until the first acquisition ring descends to the inner ring of the bearing ring, the second motor, the first camera, and the first light source are started. The first acquisition ring rotates under the action of the second linkage shaft, and during this process, the first camera realizes the acquisition of the surface image of the inner ring of the bearing ring, and the first light source is used to ensure the clarity of the image acquisition.

[0008] In order to ensure the grip of the bearing rings, the anti-slip layer is used to:

[0009] As a further improvement of the above technical solution: a bracket column is arranged between the detection platform and the top plate, a marking ring is sprayed on the top surface of the detection platform, there are two groups of clamping components and they are symmetrically arranged, one end of the mounting block is provided with a clamping electric push rod electrically connected to the operation panel, the output end of the clamping electric push rod is connected to a clamping plate, and the end of the clamping plate away from the clamping electric push rod is connected to an anti-slip layer.

[0010] The beneficial effect of this improvement is: when in use, place the bearing ring on the marked ring, then start the clamping electric push rod to drive the clamping plate to clamp the outer wall of the bearing ring, and the anti-slip layer is used to ensure the clamping of the bearing ring.

[0011] In order for the first camera to capture the surface image of the inner ring of the bearing ring:

[0012] As a further improvement of the above technical solution: a first camera and a first light source are provided on the inner side of the first acquisition ring; the second electric push rod, the first camera and the first light source are all electrically connected to the operation panel; the first light source is an LED lamp and is provided on the outer ring of the first camera.

[0013] The beneficial effect of this improvement is: after completing the clamping of the outer ring of the bearing ring, start the operation of the second electric push rod, the second electric push rod works and drives the first acquisition ring to descend, and then until the first acquisition ring descends to the inner ring of the bearing ring, start the operation of the second motor, the first camera, and the first light source, and the first acquisition ring rotates under the action of the second linkage shaft. During this process, the first camera realizes the acquisition of the surface image of the inner ring of the bearing ring, and the first light source is used to ensure the clarity of the image acquisition.

[0014] In order to realize the rotation of the first collection ring on the inner ring of the bearing ring:

[0015] As a further improvement of the above technical solution: the second motor is arranged on the inner side of the inner groove of the layer plate and is electrically connected to the operation panel, the output end of the second motor is connected to the transmission gear through the rotating shaft, the outer wall of the second linkage shaft is connected to the driven gear and is meshed with the adjacent transmission gear, and the top of the second linkage shaft is rotatably connected to the inner wall of the inner groove of the layer plate.

[0016] The beneficial effect of this improvement is: after the second electric push rod lowers the first collection ring to the inner ring of the bearing ring, the second motor is started, and then the second motor works and drives the driven gear to rotate through the transmission gear, thereby realizing the rotation of the first collection ring in the inner ring of the bearing ring.

[0017] To ensure that the four positioning inner rings and the anti-slip layer fit tightly against the inner wall of the bearing ring:

[0018] As a further improvement of the above technical solution: the outer wall of the circumference of the lifting column is connected to a third electric push rod, there are four third electric push rods in total and they are electrically connected to the operation panel, the four third electric push rods are arranged equidistantly around the circumference, the output end of the third electric push rod is connected to a positioning inner ring, and the inner side of the positioning inner ring away from the end of the third electric push rod is inlaid with an anti-slip layer.

[0019] The beneficial effect of this improvement is: the first electric push rod raises the lifting column to a predetermined height, starts the operation of the third electric push rod, and the third electric push rod drives the connected positioning inner ring to gradually approach the inner wall of the bearing ring until the four positioning inner rings and the anti-slip layer are tightly fitted with the inner wall of the bearing ring.

[0020] To achieve the rotation of the lifting column:

[0021] As a further improvement of the above technical solution: a platform inner groove is opened on the inner side of the detection platform, the power assembly is arranged on the inner side of the platform inner groove, a clearance groove is opened on the inner side of the upper part of the detection platform, the clearance groove is connected with the platform inner groove, the first motor and the first electric push rod are electrically connected with the operation panel, the transmission gear is meshed with the driven gear for transmission connection, and the bottom end of the first linkage shaft is rotatably connected with the inner wall of the platform inner groove.

[0022] The beneficial effect of this improvement is: after the inner ring of the bearing ring is fixed by positioning the inner ring, the movement of the first motor is started, and then the first motor works and drives the rotation of the transmission gear through the rotating shaft. The driven gear rotates under the engagement of the transmission gear and drives the rotation of the first linkage shaft, thereby realizing the rotation of the lifting column.

[0023] To fit the second collection ring onto the outer ring of the bearing ring:

[0024] As a further improvement of the above technical solution: there are two fourth electric push rods and they are symmetrically arranged. The fourth electric push rods are installed at the bottom of the top plate and are electrically connected to the operation panel.

[0025] The beneficial effects of this improvement are: completing the positioning of the inner ring of the bearing ring, starting the operation of the fourth electric push rod, and then the fourth electric push rod drives the second collection ring to move downward toward the bearing ring, and then until the second collection ring is in contact with the detection platform, at this time the second collection ring is sleeved on the outer ring of the bearing ring.

[0026] In order for the second camera to capture the surface image of the bearing ring outer ring:

[0027] As a further improvement of the above technical solution: the inner wall of the second acquisition ring is connected to a second camera and a second light source, the second camera and the second light source are both electrically connected to the operation panel, the second light source is an LED lamp, and there are two second light sources in total and they are symmetrically arranged at both ends of the second camera.

[0028] The beneficial effect of this improvement is: when the second acquisition ring descends to fit with the top of the detection platform, the bearing ring performs periodic circular rotation driven by the power component. During this process, the second camera realizes the acquisition of the surface image of the outer ring of the bearing ring. By symmetrically arranging the second light source at both ends of the second camera, the clarity of the image acquisition is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front cross-sectional structural schematic diagram of the present invention.

[0030] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0031] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0032] Figure 4 This is a schematic diagram of the top view of the positioning inner ring of the utility model.

[0033] Figure 5 This is a schematic diagram of the top view of the detection platform of the utility model.

[0034] Figure 6 This is a structural diagram of the second collection ring of the utility model.

[0035] In the figure: 1. Platform assembly; 11. Detection platform; 12. Platform inner groove; 13. Marking ring; 14. Support column; 15. Bearing ring; 16. Clearance groove; 2. Clamping assembly; 21. Mounting block; 22. Clamping electric push rod; 23. Clamping plate; 24. Anti-slip layer; 3. Power assembly; 31. First motor; 32. Rotating shaft; 33. Transmission gear; 34. First linkage shaft; 35. Driven gear; 36. First electric push rod; 37. Lifting column; 38. Third electric push rod; 39. Positioning inner ring; 4. First acquisition assembly; 41. Top plate; 42. Layer plate inner groove; 43. Second motor; 44. Second linkage shaft; 45. Second electric push rod; 46. First acquisition ring; 47. First camera; 48. First light source; 5. Second acquisition assembly; 51. Fourth electric push rod; 52. Second acquisition ring; 53. Second camera; 54. Second light source. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0037] like Figure 1-6As shown, a bearing ring defect detection device includes a platform component 1, a clamping component 2, a power component 3, a first collection component 4, and a second collection component 5. The platform component 1 includes a detection platform 11 and a bearing ring 15. The clamping component 2 includes a mounting block 21. The power component 3 includes a first motor 31 and a first linkage shaft 34. The first collection component 4 includes a top plate 41 and a second motor 43. The second collection component 5 includes a fourth electric push rod 51. The output end of the first motor 31 is connected to a rotating shaft 32. The end of the rotating shaft 32 away from the first motor 31 is connected to a transmission gear 33. The outer ring of the first linkage shaft 34 is provided with a driven gear 35. The top of the first linkage shaft 34 is connected to the first electric push rod 31. 6. The output end of the first electric push rod 36 is connected to the lifting column 37. The inner side of the top plate 41 is provided with a layer inner groove 42. The inner side of the layer inner groove 42 is provided with a second linkage shaft 44. The lower end of the second linkage shaft 44 is connected to the second electric push rod 45. The output end of the second electric push rod 45 is connected to the first collection ring 46. The output end of the fourth electric push rod 51 is connected to the second collection ring 52. A bracket column 14 is provided between the detection platform 11 and the top plate 41. The top surface of the detection platform 11 is sprayed with a marking ring 13. There are two groups of clamping components 2 and they are symmetrically arranged. One end of the mounting block 21 is provided with a clamping electric push rod 22 electrically connected to the operation panel. The output end of the clamping electric push rod 22 is connected to the clamping Plate 23, the clamping plate 23 is connected to an anti-slip layer 24 at one end away from the clamping electric push rod 22; when in use, the bearing ring 15 is placed on the marking ring 13, and then the clamping electric push rod 22 is started to run and drive the clamping plate 23 to clamp the outer wall of the bearing ring 15, and the anti-slip layer 24 is used to ensure the clamping of the bearing ring 15. The first camera 47 and the first light source 48 are provided on the inner side of the first acquisition ring 46, and the second electric push rod 45, the first camera 47, and the first light source 48 are all electrically connected to the operation panel. The first light source 48 is an LED lamp and is provided on the outer ring of the first camera 47; after completing the clamping of the outer ring of the bearing ring 15, the second electric push rod 45 is started, and the second electric push rod 45 works and drives the first acquisition ring 46 descends, and then until the first acquisition ring 46 descends to the inner ring of the bearing ring 15, the second motor 43, the first camera 47, and the first light source 48 are started. The first acquisition ring 46 rotates under the action of the second linkage shaft 44. During this process, the first camera 47 realizes the acquisition of the image of the inner ring surface of the bearing ring 15. The first light source 48 is used to ensure the clarity of the image acquisition. The second motor 43 is arranged on the inner side of the layer inner groove 42 and is electrically connected to the operation panel. The output end of the second motor 43 is connected to the transmission gear 33 through the rotating shaft 32. The outer wall of the second linkage shaft 44 is connected to the driven gear 35 and is meshed with the adjacent transmission gear 33 for transmission connection. The top of the second linkage shaft 44 is rotatably connected to the inner wall of the layer inner groove 42;After the second electric push rod 45 lowers the first collection ring 46 to the inner ring of the bearing ring 15, the second motor 43 is started. Then the second motor 43 works and drives the driven gear 35 to rotate through the transmission gear 33, so as to realize the rotation of the first collection ring 46 on the inner ring of the bearing ring 15. The outer wall of the circumference of the lifting column 37 is connected with a third electric push rod 38. There are four third electric push rods 38 and they are electrically connected to the operation panel. The four third electric push rods 38 are equidistantly arranged around the circumference. The output end of the third electric push rod 38 is connected with a positioning inner ring 39. The inner side of the positioning inner ring 39 away from the end of the third electric push rod 38 is inlaid with an anti-slip layer 24. The first electric push rod 36 raises the lifting column 37 to a predetermined height and starts The operation of the third electric push rod 38 drives the connected positioning inner ring 39 to gradually approach the inner wall of the bearing ring 15 until the four positioning inner rings 39 and the anti-slip layer 24 are tightly fitted with the inner wall of the bearing ring 15. The inner side of the detection platform 11 is provided with a platform inner groove 12, and the power component 3 is arranged on the inner side of the platform inner groove 12. The inner side of the upper part of the detection platform 11 is provided with a clearance groove 16, and the clearance groove 16 is communicated with the platform inner groove 12. The first motor 31 and the first electric push rod 36 are both electrically connected to the operation panel, and the transmission gear 33 is meshed with the driven gear 35 for transmission connection. The bottom end of the first linkage shaft 34 is rotatably connected to the inner wall of the platform inner groove 12; through the positioning inner ring After the inner ring of the bearing ring 15 is fixed, the movement of the first motor 31 is started. Then the first motor 31 works and drives the transmission gear 33 to rotate through the rotating shaft 32. The driven gear 35 rotates under the meshing of the transmission gear 33 and drives the rotation of the first linkage shaft 34, thereby realizing the rotation of the lifting column 37. There are two fourth electric push rods 51 and they are symmetrically arranged. The fourth electric push rods 51 are installed at the bottom of the top plate 41 and are electrically connected to the operation panel. After the positioning of the inner ring of the bearing ring 15 is completed, the operation of the fourth electric push rod 51 is started, and then the fourth electric push rod 51 drives the second collection ring 52 to descend toward the bearing ring 15, and then until the second collection ring 52 is aligned with the detection level. The second acquisition ring 52 is placed on the outer ring of the bearing ring 15. The inner wall of the second acquisition ring 52 is connected to a second camera 53 and a second light source 54. Both the second camera 53 and the second light source 54 are electrically connected to the operation panel. The second light source 54 is an LED lamp. There are two second light sources 54, symmetrically located at both ends of the second camera 53. When the second acquisition ring 52 descends to contact the top of the inspection platform 11, the bearing ring 15, driven by the power assembly 3, performs periodic circular rotation. During this process, the second camera 53 captures images of the outer surface of the bearing ring 15. The symmetrical placement of the second light sources 54 at both ends of the second camera 53 ensures the clarity of the captured images.

[0038] The working principle of the present invention is as follows: when in use, the bearing ring 15 is placed on the marking ring 13, the clamping electric push rod 22 is started to run and drive the clamping plate 23 to clamp the outer wall of the bearing ring 15, the anti-slip layer 24 is used to ensure the clamping of the bearing ring 15, the second electric push rod 45 is started to run, the second electric push rod 45 works and drives the first collection ring 46 to descend until the first collection ring 46 descends to the inner ring of the bearing ring 15, the second motor 43 is started to run, the second motor 43 works and drives the driven gear 35 to rotate through the transmission gear 33, so as to realize the rotation of the first collection ring 46 on the inner ring of the bearing ring 15, and the second motor 43 is started. The motor 43, the first camera 47, and the first light source 48 are in operation, and the first acquisition ring 46 rotates under the action of the second linkage shaft 44. During this process, the first camera 47 realizes the acquisition of the surface image of the inner ring of the bearing ring 15. The first light source 48 is used to ensure the clarity of the image acquisition. Then, the clamping of the outer wall of the bearing ring 15 is released, and the first electric push rod 36 raises the lifting column 37 to a predetermined height, and starts the operation of the third electric push rod 38. The third electric push rod 38 drives the connected positioning inner ring 39 to gradually approach the inner wall of the bearing ring 15 until the four positioning inner rings 39 and the anti-slip layer 24 are tightly fitted with the inner wall of the bearing ring 15. 9 completes the fixation of the inner ring of the bearing ring 15, starts the movement of the first motor 31, the first motor 31 works and drives the rotation of the transmission gear 33 through the rotating shaft 32, the driven gear 35 rotates under the meshing of the transmission gear 33 and drives the rotation of the first linkage shaft 34, thereby realizing the rotation of the lifting column 37, completing the positioning of the inner ring of the bearing ring 15, starting the operation of the fourth electric push rod 51, and then the fourth electric push rod 51 drives the second collection ring 52 to perform a descending movement close to the bearing ring 15, and then until the second collection ring 52 is in contact with the detection platform 11, at this time the second collection ring 52 is sleeved on the outer ring of the bearing ring 15, when the second collection ring 5 After descending to fit the top of the detection platform 11, the bearing ring 15 performs periodic circular rotation driven by the power assembly 3. During this process, the second camera 53 captures the image of the outer ring surface of the bearing ring 15. The second light sources 54 are symmetrically arranged at both ends of the second camera 53 to ensure the clarity of the image capture. The first camera 47 and the second camera 53 achieve the purpose of image capture and storage. The relevant principles involved in this structure are publicly available existing technologies, and the components are all universal standard parts or components known to those skilled in the art. The structure and principles are all known to those skilled in the art through technical manuals or conventional experimental methods.

[0039] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of the present utility model.

Claims

1. A bearing ring defect detection device, comprising a platform assembly (1), a clamping assembly (2), a power assembly (3), a first collection assembly (4), and a second collection assembly (5), wherein the platform assembly (1) comprises a detection platform (11) and a bearing ring (15), the clamping assembly (2) comprises a mounting block (21), the power assembly (3) comprises a first motor (31) and a first linkage shaft (34), the first collection assembly (4) comprises a top plate (41) and a second motor (43), and the second collection assembly (5) comprises a fourth electric push rod (51), characterized in that: The output end of the first motor (31) is connected to a rotating shaft (32), and the end of the rotating shaft (32) away from the first motor (31) is connected to a transmission gear (33). The outer ring of the first linkage shaft (34) is provided with a driven gear (35). The top of the first linkage shaft (34) is connected to a first electric push rod (36), and the output end of the first electric push rod (36) is connected to a lifting column (37). The inner side of the top plate (41) is provided with a layer plate inner groove (42), and the inner side of the layer plate inner groove (42) is provided with a second linkage shaft (44). The lower end of the second linkage shaft (44) is connected to a second electric push rod (45), and the output end of the second electric push rod (45) is connected to a first collection ring (46). The output end of the fourth electric push rod (51) is connected to a second collection ring (52).

2. A bearing ring defect detection device according to claim 1, characterized in that: A bracket column (14) is provided between the detection platform (11) and the top plate (41), a marking ring (13) is sprayed on the top surface of the detection platform (11), the clamping assembly (2) has two groups and is symmetrically arranged, one end of the mounting block (21) is provided with a clamping electric push rod (22) electrically connected to the operation panel, the output end of the clamping electric push rod (22) is connected to a clamping plate (23), and the end of the clamping plate (23) away from the clamping electric push rod (22) is connected to an anti-slip layer (24).

3. The bearing ring defect detection device according to claim 1, characterized in that: A first camera (47) and a first light source (48) are arranged on the inner side of the first acquisition ring (46); the second electric push rod (45), the first camera (47), and the first light source (48) are all electrically connected to the operation panel; the first light source (48) is an LED lamp and is arranged on the outer ring of the first camera (47).

4. The bearing ring defect detection device according to claim 1, characterized in that: The second motor (43) is arranged inside the inner groove (42) of the layer plate and is electrically connected to the operation panel. The output end of the second motor (43) is connected to the transmission gear (33) through the rotating shaft (32). The outer wall of the second linkage shaft (44) is connected to the driven gear (35) and is meshed and transmission-connected with the adjacent transmission gear (33). The top of the second linkage shaft (44) is rotationally connected to the inner wall of the inner groove (42) of the layer plate.

5. The bearing ring defect detection device according to claim 1, characterized in that: The outer wall of the circumference of the lifting column (37) is connected to a third electric push rod (38), and there are four third electric push rods (38) in total and they are electrically connected to the operation panel. The four third electric push rods (38) are equidistantly arranged around the circumference, and the output end of the third electric push rod (38) is connected to a positioning inner ring (39), and the inner side of the positioning inner ring (39) away from one end of the third electric push rod (38) is inlaid with an anti-slip layer (24).

6. The bearing ring defect detection device according to claim 1, characterized in that: The inner side of the detection platform (11) is provided with a platform inner groove (12), the power assembly (3) is arranged on the inner side of the platform inner groove (12), the inner side of the upper part of the detection platform (11) is provided with a clearance groove (16), the clearance groove (16) is connected with the platform inner groove (12), the first motor (31) and the first electric push rod (36) are both electrically connected to the operation panel, the transmission gear (33) and the driven gear (35) are meshed and transmission-connected, and the bottom end of the first linkage shaft (34) is rotationally connected to the inner wall of the platform inner groove (12).

7. The bearing ring defect detection device according to claim 1, characterized in that: There are two fourth electric push rods (51) in total and they are symmetrically arranged. The fourth electric push rods (51) are installed at the bottom of the top plate (41) and are electrically connected to the operation panel.

8. The bearing ring defect detection device according to claim 1, characterized in that: The inner wall of the second acquisition ring (52) is connected to a second camera (53) and a second light source (54). The second camera (53) and the second light source (54) are both electrically connected to the operation panel. The second light source (54) is an LED lamp. There are two second light sources (54) and they are symmetrically arranged at both ends of the second camera (53).

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