Stator inner ring accurate grinding device

Abstract

The utility model belongs to the technical field of motor machining, and particularly relates to a stator inner ring accurate grinding device which comprises a speed chain conveying line, and further comprises a material loading mechanism used for loading a stator and conveying the stator along the speed chain conveying line, the material loading mechanism comprises a material loading tray, and a round hole is formed in the middle of the material loading tray; the clamping mechanism is fixed on the double-speed chain conveying line and is used for clamping the stator conveyed to the grinding station; the polishing mechanism is fixed to the speed chain conveying line, the polishing mechanism comprises a second lifting plate, an upper rotating disc, a lower rotating disc, a polishing block, an upper connecting arm, a lower connecting arm, a servo motor and a third vertical air cylinder, and the upper rotating disc is rotationally installed on the bottom face of the second lifting plate; the distance between the upper rotating disc and the lower rotating disc is changed by starting a third vertical air cylinder, the horizontal direction of the grinding block can be adjusted, and the stator grinding device is suitable for machining most stators with different inner diameters and wide in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor processing, and in particular relates to a stator inner ring fine grinding device. Background Art

[0002] After the motor stator is assembled, the coil inside the stator is usually wrapped with insulating paper. After the coil is installed in the stator, the end of the insulating paper tends to protrude from the inner wall of the stator, affecting the assembly and operation of the rotor. Therefore, it is necessary to grind off the part of the insulating paper protruding from the inner wall of the stator.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number CN209887263U discloses a "stator inner ring grinding system", comprising: a conveyor line, on which a tray for placing stators to be ground is provided; a frame spanning the conveyor line; a grinding mechanism carried by the frame, the grinding mechanism comprising: a mounting seat slidably mounted on the frame, a drive motor fixed to the mounting seat, a grinding head mounted on the power output shaft of the drive motor, and a lifting drive device; a lifting mechanism for lifting the tray upward; and a clamping mechanism.

[0004] Although the stator inner ring grinding equipment in the prior art can meet the general stator grinding needs, it is only suitable for grinding stators with a single inner diameter. The grinding head needs to be replaced for stators with different inner diameters, which has great limitations in use.

[0005] In order to solve the above problems, a stator inner ring fine grinding device is proposed in the present application. Utility Model Content

[0006] In order to solve the above problems existing in the prior art, the utility model provides a stator inner ring fine grinding device, which has the characteristics of easy use and wide application range.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stator inner ring fine grinding device, including a double-speed chain conveyor line, and also including:

[0008] A loading mechanism, used for loading the stator and conveying it along the double-speed chain conveyor line, and the loading mechanism comprises a loading tray, and the middle part of the loading tray has a round hole;

[0009] A clamping mechanism, the clamping mechanism is fixed on the double-speed chain conveyor line and is used to clamp the stator conveyed to the grinding station;

[0010] The grinding mechanism is fixed on the double-speed chain conveyor line, and the grinding mechanism includes a No. 2 lifting plate, an upper turntable, a lower turntable, a grinding block, an upper connecting arm, a lower connecting arm, a servo motor and a No. 3 vertical cylinder. The No. 2 lifting plate can move freely in the vertical direction, and the upper turntable is rotatably installed on the bottom surface of the No. 2 lifting plate. The servo motor is fixed on the No. 2 lifting plate to drive the upper turntable to rotate. The lower turntable is located directly below the upper turntable, and the diameter of the lower turntable is smaller than the inner diameter of the circular hole. A plurality of grinding blocks are evenly spaced along the circumferential direction. The top end of the upper connecting arm is hinged to the upper turntable, and the bottom end is hinged to the grinding block. The top end of the lower connecting arm is hinged to the grinding block, and the bottom end is hinged to the lower turntable. The No. 3 vertical cylinder is fixed to the bottom surface of the upper turntable, and the piston rod of the No. 3 vertical cylinder is fixedly connected to the lower turntable.

[0011] Preferably, the loading mechanism further comprises a positioning block, the positioning block is fixed on the loading tray, and a stepped groove is provided on the positioning block.

[0012] Preferably, the clamping mechanism comprises a No. 1 fixing frame, a horizontal plate, a No. 1 lifting plate, a No. 1 vertical cylinder, a No. 2 fixing frame, a clamping block and a horizontal cylinder;

[0013] The two No. 1 fixing frames are symmetrically fixed to the bottom surface of the double-speed chain conveyor line, the horizontal plate is fixed to the bottom end of the No. 1 fixing frame, the No. 1 vertical cylinder is fixed to the bottom surface of the horizontal plate, and the piston rod of the No. 1 vertical cylinder passes through the horizontal plate and is fixedly connected to the No. 1 lifting plate;

[0014] The two No. 2 fixing frames are symmetrically fixed on the No. 1 lifting plate, the horizontal cylinder is fixed on the No. 2 fixing frame, and the piston rod of the horizontal cylinder passes through the No. 2 fixing frame and is fixedly connected to the clamping block, and V-shaped grooves are provided on opposite surfaces of the two clamping blocks.

[0015] Preferably, a rubber gasket is bonded and fixed in the V-shaped groove.

[0016] Preferably, a No. 1 guide column which passes through the transverse plate is fixed on the bottom surface of the No. 1 lifting plate.

[0017] Preferably, a guide rod penetrating the second fixing frame is fixed on the clamping block.

[0018] Preferably, the grinding mechanism further comprises a No. 1 side plate, a No. 1 top plate and a No. 2 vertical cylinder;

[0019] The two No. 1 side plates are symmetrically fixed on the double-speed chain conveyor line, the No. 1 top plate is fixed on the top of the No. 1 side plate, the No. 2 vertical cylinder is fixed on the No. 1 top plate, and the piston rod of the No. 2 vertical cylinder passes through the No. 1 top plate and is fixedly connected to the No. 2 lifting plate.

[0020] Preferably, a second guide column penetrating through the first top plate is fixed on the second lifting plate.

[0021] Preferably, it further comprises a first detection module, and the first detection module comprises a sensor fixing frame and a photoelectric sensor;

[0022] The sensor fixing frame is fixed on the double-speed chain conveyor line, and the photoelectric sensor is fixed on the sensor fixing frame and faces the clamping mechanism.

[0023] Preferably, it further comprises a second detection module, and the second detection module comprises a second side plate, a second top plate, a third fixing frame, a CCD camera and a ring light source;

[0024] The two No. 2 side panels are symmetrically fixed on the double-speed chain conveyor line, the No. 2 top panel is fixed on the top of the No. 2 side panel, the CCD camera is fixed on the No. 2 top panel using a No. 3 fixing bracket, and the annular light source is fixed on the No. 2 top panel and is directly below the CCD camera.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] In the utility model, the horizontal position of the grinding block can be adjusted by starting the third vertical cylinder to change the distance between the upper turntable and the lower turntable. The utility model is suitable for processing most stators with different inner diameters and has a wide range of applications.

[0027] Other additional advantages and beneficial effects of the present application will be given in part in the following description, and in part will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural schematic diagram of the utility model;

[0030] Figure 2 This is a schematic diagram of the axonometric structure of the material loading mechanism in the utility model;

[0031] Figure 3This is a schematic diagram of the axonometric structure of the clamping mechanism in the utility model;

[0032] Figure 4 This is a schematic diagram of the axonometric structure of the grinding mechanism in the utility model;

[0033] Figure 5 This is a schematic diagram of the axonometric structure of the first detection module in the present utility model;

[0034] Figure 6 This is a schematic diagram of the axonometric structure of the second detection module in the present utility model;

[0035] In the figure: 1. Double-speed chain conveyor line; 2. Loading mechanism; 21. Loading tray; 211. Round hole; 22. Positioning block; 221. Step groove; 3. Clamping mechanism; 31. No. 1 fixed frame; 32. Horizontal plate; 33. No. 1 lifting plate; 331. No. 1 guide column; 34. No. 1 vertical cylinder; 35. No. 2 fixed frame; 36. Clamping block; 361. V-shaped groove; 362. Guide rod; 37. Horizontal cylinder; 38. Rubber liner; 4. Grinding mechanism; 401. No. 1 side plate; 402. No. 1 top plate ; 403, No. 2 vertical cylinder; 404, No. 2 lifting plate; 405, upper turntable; 406, lower turntable; 407, grinding block; 408, upper connecting arm; 409, lower connecting arm; 410, servo motor; 411, No. 3 vertical cylinder; 412, No. 2 guide column; 5, first detection module; 51, sensor fixing bracket; 52, photoelectric sensor; 6, second detection module; 61, No. 2 side panel; 62, No. 2 top panel; 63, No. 3 fixing bracket; 64, CCD camera; 65, ring light source. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] See also Figure 1-Figure 6 The utility model provides the following technical solution: a stator inner ring fine grinding device, including a double-speed chain conveyor line 1, and also includes:

[0038] The loading mechanism 2 is used for loading the stator and conveying it along the double-speed chain conveyor line 1, and the loading mechanism 2 includes a loading tray 21, and the middle of the loading tray 21 has a circular hole 211;

[0039] The loading tray 21 is used to load the stator to be polished. During operation, the loading tray 21 is placed on the double-speed chain conveyor line 1 for transportation, so that the stator is transferred between different workstations.

[0040] The clamping mechanism 3 is fixed on the double-speed chain conveyor line 1 and is used to clamp the stator conveyed to the grinding station;

[0041] Further, by Figure 1 and Figure 3 As shown, the clamping mechanism 3 includes a No. 1 fixing frame 31, a transverse plate 32, a No. 1 lifting plate 33, a No. 1 vertical cylinder 34, a No. 2 fixing frame 35, a clamping block 36 and a horizontal cylinder 37. The two No. 1 fixing frames 31 are symmetrically fixed to the bottom surface of the double-speed chain conveyor line 1, the transverse plate 32 is fixed to the bottom end of the No. 1 fixing frame 31, the No. 1 vertical cylinder 34 is fixed to the bottom surface of the transverse plate 32, and the piston rod of the No. 1 vertical cylinder 34 passes through the transverse plate 32 and is fixedly connected to the No. 1 lifting plate 33, the two No. 2 fixing frames 35 are symmetrically fixed on the No. 1 lifting plate 33, and the horizontal cylinder 37 is fixed to the No. 2 The first vertical cylinder 34 is started, and the first lifting plate 33 is pushed upward by the piston rod of the first vertical cylinder 34, and the loading tray 21 is lifted by the first lifting plate 33. Then, the horizontal cylinders 37 on both sides are started, and the clamping block 36 is pushed inward by the piston rod of the horizontal cylinder 37, and the stator is clamped by the V-groove 361 to ensure the stability of the stator.

[0042] The design of V-groove 361 is suitable for most stators with different diameters.

[0043] The grinding mechanism 4 is fixed on the double-speed chain conveyor line 1, and the grinding mechanism 4 includes a second lifting plate 404, an upper turntable 405, a lower turntable 406, a grinding block 407, an upper connecting arm 408, a lower connecting arm 409, a servo motor 410 and a third vertical cylinder 411. The second lifting plate 404 can move freely in the vertical direction, and the upper turntable 405 is rotatably installed on the bottom surface of the second lifting plate 404. The servo motor 410 is fixed on the second lifting plate 404 to drive the upper turntable 405 to rotate, and the lower turntable 406 is used to drive the upper turntable 405 to rotate. The turntable 406 is located directly below the upper turntable 405, and the diameter of the lower turntable 406 is smaller than the inner diameter of the circular hole 211. Multiple grinding blocks 407 are evenly spaced along the circumferential direction. The top of the upper connecting arm 408 is hinged to the upper turntable 405, and the bottom end is hinged to the grinding block 407. The top of the lower connecting arm 409 is hinged to the grinding block 407, and the bottom end is hinged to the lower turntable 406. The No. 3 vertical cylinder 411 is fixed to the bottom surface of the upper turntable 405, and the piston rod of the No. 3 vertical cylinder 411 is fixedly connected to the lower turntable 406.

[0044] Further, by Figure 1 and Figure 4As shown, the grinding mechanism 4 also includes a No. 1 side plate 401, a No. 1 top plate 402 and a No. 2 vertical cylinder 403. The two No. 1 side plates 401 are symmetrically fixed on the double-speed chain conveyor line 1. The No. 1 top plate 402 is fixed on the top of the No. 1 side plate 401. The No. 2 vertical cylinder 403 is fixed on the No. 1 top plate 402, and the piston rod of the No. 2 vertical cylinder 403 penetrates the No. 1 top plate 402 and is fixedly connected to the No. 2 lifting plate 404. After the stator is clamped, the No. 2 vertical cylinder 403 is started, and the piston rod of the No. 2 vertical cylinder 403 pushes the No. 2 vertical cylinder 403 to move. The lifting plate 404 moves downward, and the servo motor 410 is started to drive the upper turntable 405 to rotate, so that the grinding block 407 rotates. When the grinding block 407 is inserted into the stator, the No. 3 vertical cylinder 411 is started, and the height of the lower turntable 406 is changed by the piston rod of the No. 3 vertical cylinder 411. At this time, the upper connecting arm 408 and the lower connecting arm 409 are flipped, and the grinding block 407 is driven to move, so that the grinding block 407 is pressed against the inner ring of the stator to complete the grinding. The position of the grinding block 407 is adjustable, which is suitable for most stator processing with different inner diameters and has a wide range of applications.

[0045] Depend on Figure 1 and Figure 2 As shown, the loading mechanism 2 also includes a positioning block 22, which is fixed on the loading tray 21, and a stepped groove 221 is provided on the positioning block 22. The positioning block 22 is used to position the stator to further improve the stability of stator transportation, and the stepped groove 221 is suitable for most stators with different diameters.

[0046] The positioning block 22 can be designed as a circular ring structure or as an arc-shaped block for positioning and supporting the stator. The positioning block 22 of the utility model is an arc-shaped block, and a plurality of the positioning blocks 22 are evenly spaced along the circumferential direction.

[0047] Depend on Figure 1 and Figure 3 As shown, a rubber liner 38 is bonded and fixed in the V-shaped groove 361, which has flexibility and anti-slip effects, thereby improving the stability during the grinding process of the stator inner ring.

[0048] Depend on Figure 1 and Figure 3 As shown, a guide column 331 is fixed on the bottom surface of the No. 1 lifting plate 33 and is arranged to penetrate the horizontal plate 32 , so as to guide the No. 1 lifting plate 33 and improve the stability of the No. 1 lifting plate 33 .

[0049] Depend on Figure 1 and Figure 3 As shown, a guide rod 362 penetrating the second fixing frame 35 is fixed on the clamping block 36 to guide the clamping block 36 and improve the stability of the clamping block 36 .

[0050] Depend on Figure 1 and Figure 4As shown, a second guide column 412 penetrating the first top plate 402 is fixed on the second lifting plate 404 to guide the second lifting plate 404 and improve the stability of the second lifting plate 404 .

[0051] Depend on Figure 1 and Figure 5 As shown, it also includes a first detection module 5, and the first detection module 5 includes a sensor fixing frame 51 and a photoelectric sensor 52;

[0052] The sensor fixing frame 51 is fixed on the double-speed chain conveyor line 1, and the photoelectric sensor 52 is fixed on the sensor fixing frame 51 and faces the clamping mechanism 3. The photoelectric sensor 52 is used to detect whether a stator has arrived at the grinding station. The equipment will continue to work only after it is confirmed that a stator has arrived at the grinding station.

[0053] Depend on Figure 1 and Figure 6 As shown, it also includes a second detection module 6, and the second detection module 6 includes a second side plate 61, a second top plate 62, a third fixing frame 63, a CCD camera 64 and a ring light source 65;

[0054] The two No. 2 side plates 61 are symmetrically fixed on the double-speed chain conveyor line 1, the No. 2 top plate 62 is fixed on the top of the No. 2 side plate 61, the CCD camera 64 is fixed on the No. 2 top plate 62 using the No. 3 fixing frame 63, and the annular light source 65 is fixed on the No. 2 top plate 62 and is directly below the CCD camera 64. The CCD camera 64 is used to detect the quality of the stator inner ring grinding, avoid defective products, and rework the stators that fail to be polished.

[0055] Working principle and use process of the utility model: When the stator inner ring fine grinding device of the utility model is used, the stator to be ground is placed on the loading tray 21, supported by the step groove 221, and the loading tray 21 is placed on the double-speed chain conveyor line 1 for transportation, so that the stator can be transferred between different workstations;

[0056] When the stator reaches the grinding station, the first vertical cylinder 34 is started, and the first lifting plate 33 is pushed upward by the piston rod of the first vertical cylinder 34, and the loading tray 21 is lifted by the first lifting plate 33. Then, the horizontal cylinders 37 on both sides are started, and the piston rods of the horizontal cylinders 37 push the clamping block 36 to move inward, and the stator is clamped by the V-shaped groove 361 to ensure the stability of the stator;

[0057] After the stator is clamped, the second vertical cylinder 403 is started, and the piston rod of the second vertical cylinder 403 pushes the second lifting plate 404 to move downward, and the servo motor 410 is started to drive the upper turntable 405 to rotate, so that the grinding block 407 rotates. When the grinding block 407 is inserted into the stator, the third vertical cylinder 411 is started, and the height of the lower turntable 406 is changed by the piston rod of the third vertical cylinder 411. At this time, the upper connecting arm 408 and the lower connecting arm 409 are turned over, and the grinding block 407 is driven to move, so that the grinding block 407 is pressed against the inner ring of the stator to complete the grinding. The position of the grinding block 407 is adjustable, which is suitable for most stator processing with different inner diameters and has a wide range of applications.

[0058] Start the second vertical cylinder 403 to change the height of the grinding block 407, so that the grinding block 407 moves along the central axis of the stator to fully complete the grinding;

[0059] After the grinding is completed, the clamping mechanism 3 and the grinding mechanism 4 are reset, and the double-speed chain conveyor line 1 continues to transport and then grinds the next stator.

[0060] It should be noted that the double-speed chain conveyor line 1, No. 1 vertical cylinder 34, horizontal cylinder 37, No. 2 vertical cylinder 403, servo motor 410, No. 3 vertical cylinder 411, photoelectric sensor 52, CCD camera 64 and ring light source 65 are all conventional equipment purchased on the market. Those skilled in the art can make routine selections according to usage requirements. Their working principles are common knowledge well known to those skilled in the art and have been fully disclosed by the prior art, so they will not be elaborated in this article.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A stator inner ring fine grinding device, comprising a double-speed chain conveyor line (1), characterized in that: Also includes: A loading mechanism (2) is used for loading the stator for conveying along the double-speed chain conveyor line (1), and the loading mechanism (2) comprises a loading tray (21), and a circular hole (211) is provided in the middle of the loading tray (21); A clamping mechanism (3), the clamping mechanism (3) being fixed on the double-speed chain conveyor line (1) and being used for clamping the stator conveyed to the grinding station; The grinding mechanism (4) is fixed on the double-speed chain conveyor line (1), and the grinding mechanism (4) includes a No. 2 lifting plate (404), an upper turntable (405), a lower turntable (406), a grinding block (407), an upper connecting arm (408), a lower connecting arm (409), a servo motor (410) and a No. 3 vertical cylinder (411). The No. 2 lifting plate (404) can move freely in the vertical direction, the upper turntable (405) is rotatably mounted on the bottom surface of the No. 2 lifting plate (404), the servo motor (410) is fixed on the No. 2 lifting plate (404) and is used to drive the upper turntable (405) to rotate, and the lower turntable (406) is used to drive the upper turntable (405) to rotate. The disk (406) is located directly below the upper turntable (405), and the diameter of the lower turntable (406) is smaller than the inner diameter of the circular hole (211). The plurality of grinding blocks (407) are evenly spaced along the circumferential direction. The top end of the upper connecting arm (408) is hinged to the upper turntable (405), and the bottom end is hinged to the grinding block (407). The top end of the lower connecting arm (409) is hinged to the grinding block (407), and the bottom end is hinged to the lower turntable (406). The third vertical cylinder (411) is fixed to the bottom surface of the upper turntable (405), and the piston rod of the third vertical cylinder (411) is fixedly connected to the lower turntable (406).

2. The stator inner ring fine grinding device according to claim 1, characterized in that: The loading mechanism (2) further comprises a positioning block (22), wherein the positioning block (22) is fixed on the loading tray (21), and a stepped groove (221) is provided on the positioning block (22).

3. The stator inner ring fine grinding device according to claim 1, characterized in that: The clamping mechanism (3) comprises a No. 1 fixing frame (31), a horizontal plate (32), a No. 1 lifting plate (33), a No. 1 vertical cylinder (34), a No. 2 fixing frame (35), a clamping block (36) and a horizontal cylinder (37); The two No. 1 fixing frames (31) are symmetrically fixed on the bottom surface of the double-speed chain conveyor line (1), the horizontal plate (32) is fixed to the bottom end of the No. 1 fixing frame (31), the No. 1 vertical cylinder (34) is fixed to the bottom surface of the horizontal plate (32), and the piston rod of the No. 1 vertical cylinder (34) passes through the horizontal plate (32) and is fixedly connected to the No. 1 lifting plate (33); The two No. 2 fixing frames (35) are symmetrically fixed on the No. 1 lifting plate (33), the horizontal cylinder (37) is fixed on the No. 2 fixing frame (35), and the piston rod of the horizontal cylinder (37) passes through the No. 2 fixing frame (35) and is fixedly connected to the clamping block (36), and V-shaped grooves (361) are provided on opposite surfaces of the two clamping blocks (36).

4. The stator inner ring fine grinding device according to claim 3, characterized in that: A rubber gasket (38) is bonded and fixed in the V-shaped groove (361).

5. The stator inner ring fine grinding device according to claim 3, characterized in that: A first guide post (331) penetrating the horizontal plate (32) is fixed on the bottom surface of the first lifting plate (33).

6. The stator inner ring fine grinding device according to claim 3, characterized in that: A guide rod (362) penetrating the second fixing frame (35) is fixed on the clamping block (36).

7. The stator inner ring fine grinding device according to claim 1, characterized in that: The grinding mechanism (4) further comprises a first side plate (401), a first top plate (402) and a second vertical cylinder (403); The two No. 1 side plates (401) are symmetrically fixed on the double-speed chain conveyor line (1), the No. 1 top plate (402) is fixed on the top of the No. 1 side plate (401), the No. 2 vertical cylinder (403) is fixed on the No. 1 top plate (402), and the piston rod of the No. 2 vertical cylinder (403) passes through the No. 1 top plate (402) and is fixedly connected to the No. 2 lifting plate (404).

8. The stator inner ring fine grinding device according to claim 7, characterized in that: A second guide column (412) penetrating the first top plate (402) is fixed on the second lifting plate (404).

9. The stator inner ring fine grinding device according to claim 1, characterized in that: It also includes a first detection module (5), and the first detection module (5) includes a sensor fixing frame (51) and a photoelectric sensor (52); The sensor fixing frame (51) is fixed on the double-speed chain conveyor line (1), and the photoelectric sensor (52) is fixed on the sensor fixing frame (51) and faces the clamping mechanism (3).

10. The stator inner ring fine grinding device according to claim 1, characterized in that: It also includes a second detection module (6), and the second detection module (6) includes a second side plate (61), a second top plate (62), a third fixing frame (63), a CCD camera (64) and a ring light source (65); The two No. 2 side plates (61) are symmetrically fixed on the double-speed chain conveyor line (1), the No. 2 top plate (62) is fixed on the top of the No. 2 side plate (61), the CCD camera (64) is fixed on the No. 2 top plate (62) using a No. 3 fixing frame (63), and the annular light source (65) is fixed on the No. 2 top plate (62) and is located directly below the CCD camera (64).

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