Crankshaft roughness detection equipment

Abstract

The invention relates to the field of workpiece detection, in particular to crankshaft roughness detection equipment, which comprises a mounting piece for fixing the position of a crankshaft, a rotating piece motor for rotating the mounting piece to drive a power shaft to rotate, a roughness instrument of which a contact pin is in contact with the circumferential surface of the power shaft, and a moving device for moving the roughness instrument, the mounting piece is slidably connected with a radial moving block in the radial direction of the output shaft of the rotating piece motor, the radial moving block is provided with a chuck for clamping and fixing the connecting rod journals, and the radial moving block is provided with a radial control piece for fixing the position of the radial moving block, so that the connecting rod journals of crankshafts of different specifications can be fixed by the chuck, and then the position of the chuck is adjusted; therefore, the axes of the power shafts of different specifications can be kept consistent with the rotating axis of the rotating piece motor.

Description

Technical Field

[0001] The present application relates to the field of workpiece detection, and in particular to a crankshaft roughness detection device. Background Art

[0002] After the initial processing of the refrigerator crankshaft, a product consisting of a power shaft, a connecting rod journal and a balance block is obtained. The length of the power shaft is longer than the length of the connecting rod journal and the two are eccentrically set. The balance block is similar to a semicircular piece and is located between the power shaft and the connecting rod journal. Then the roughness of the power shaft surface needs to be tested to ensure that there are no major problems with the surface quality of the final crankshaft. For this purpose, a roughness tester is needed to test the power shaft surface.

[0003] For example, a crankshaft surface roughness detection device for a refrigerator compressor with announcement number CN221099691U places the end of the power shaft close to the balance block into a limit cylinder for fixation, and then places the stylus of the roughness meter against the circumferential surface of the power shaft. The limit cylinder then drives the crankshaft to rotate while the crankshaft moves forward along its own axis to fully detect the circumferential outer wall of the power shaft.

[0004] Regarding the above-mentioned related technologies, during the positioning and installation process, once the specifications of the crankshaft change, the axis of the power shaft installed in the limit cylinder and the rotation axis of the limit cylinder will deviate, making it difficult to detect the surface roughness of crankshafts of different specifications. Summary of the invention

[0005] In order to better adapt to the detection of crankshaft surface roughness of different specifications within a certain range, the present application provides a crankshaft roughness detection device.

[0006] A crankshaft roughness detection device provided in the present application adopts the following technical solution.

[0007] A crankshaft roughness detection device comprises a mounting part for fixing the position of the crankshaft, a rotary motor for rotating the mounting part to drive the power shaft to rotate, a roughness meter whose stylus contacts the circumferential surface of the power shaft, and a moving device for moving the roughness meter, wherein the mounting part is connected with a radial displacement block in a radial sliding manner along the output shaft of the rotary motor, the radial displacement block is equipped with a chuck for clamping and fixing the connecting rod journal, and the radial displacement block is provided with a radial control part for fixing the position of the radial displacement block.

[0008] By adopting the above technical solution, when crankshafts of different specifications are tested, the moving block is moved until the axis of the crankshaft power shaft and the rotation axis of the mounting part are consistent, so as to adapt to the roughness test of crankshafts of different specifications within a certain range using the same equipment.

[0009] Optionally, there are two positioning members on the side of the chuck facing the roughness meter, the positioning members are V-shaped, the center line between the two positioning members is consistent with the output shaft axis of the rotating motor, the two ends of one positioning member are slidably connected to the two ends of the other positioning member in a one-to-one manner, and the two positioning members are provided with positioning motors that make the two positioning members close to or away from each other.

[0010] By adopting the above technical solution, after the connecting rod journal of the crankshaft is fixed on the chuck, the two positioning parts are close to each other, so that when the two positioning parts press the power shaft tightly and can no longer move, the axis of the power shaft is consistent with the rotation axis of the mounting part, so as to quickly adjust the crankshaft posture before the test starts.

[0011] Optionally, the positioning motor output shaft is coaxially and detachably connected with a bidirectional lead screw, the bidirectional lead screw is threadedly connected to two lead levers, two positioning members are connected to adjacent sides of the two lead levers one by one, and the thread directions of the bidirectional lead screw at the connection position of the two lead levers are opposite.

[0012] By adopting the above technical solution, it is ensured that the two positioning members move synchronously, so that the center lines of the two positioning members are always consistent with the rotation axis of the mounting member during the movement.

[0013] Optionally, the positioning member is plugged into a wire lever, and a front pressure sensor for the positioning member to abut against is provided in the wire lever.

[0014] By adopting the above technical solution, when the positioning member presses the power shaft tightly, the pressure applied by the positioning member to the power shaft can be better controlled, so that the power shaft is not easily subjected to excessive pressure from the positioning member.

[0015] Optionally, the radial control unit is threadedly connected to a rack rod slidably connected to the radial displacement block, the rack rod is fixedly connected to a fixed rack, and the mounting piece is fixedly connected to a radial rack for engagement with the fixed rack.

[0016] By adopting the above technical solution, when the two positioning members approach each other to position the crankshaft, the fixed rack is away from the radial rack, so that the positioning members can force the radial displacement block to move accordingly during the process of moving closer, so as to adjust the crankshaft to a suitable posture.

[0017] Optionally, the radial displacement block includes a radial slider slidably connected to the mounting member and a rotating block rotatably connected to the radial slider and connected to the chuck, the rotating axis of the rotating block is the same as the center line of the chuck, and the radial slider is provided with a rotating control unit for limiting the arbitrary rotation of the rotating block.

[0018] By adopting the above-mentioned technical solution, when installing and fixing the connecting rod journal corresponding to the chuck, it is only necessary to roughly install it in place, and there is no need to adjust the connecting rod journal before being fixed by the chuck so that the direction of the line between the connecting rod journal axis and the power shaft axis is the same as the moving direction of the radial displacement block, so as to facilitate the installation and positioning work before crankshaft inspection.

[0019] Optionally, the radial slider is rotatably connected to a movable end face toothed disc coaxially fixedly connected to the rotating block, the movable end face toothed disc meshes with a fixed end face toothed disc rotatably connected to the rotating block, the fixed end face toothed disc is fixedly connected to a directional rod slidably connected to the radial slider, and the rotating control is rotatably connected to the radial slider and threadedly connected to the directional rod.

[0020] By adopting the above technical solution, when the two positioning members are close to each other to position the power shaft, the fixed end face gear disc is away from the movable end face gear disc, so that the rotating block can be rotated and adjusted accordingly.

[0021] Optionally, the moving device includes an axial shifting platform that moves along the axial direction of the rotating motor, an axial shifting electric cylinder that drives the axial shifting platform to move, an instrument block that is radially slidably connected to the axial shifting platform along the output shaft of the rotating motor and for mounting a roughness meter, a radial shifting screw that is rotatably connected to the axial shifting platform and threadedly connected to the instrument block, and a screw control that is rotatably connected to the axial shifting platform and coaxially fixedly connected to the radial shifting screw.

[0022] By adopting the above technical solution, the stylus of the roughness meter can move along the axial direction of the power shaft while the power shaft rotates, so as to perform a more comprehensive inspection of the entire circumferential outer wall of the power shaft.

[0023] Optionally, the instrument block includes a main block slidably connected to the axial moving stage and threadedly connected to the radial moving screw, a secondary block slidably connected to the main block along the sliding direction of the axial moving stage and for connection of a roughness meter, a rear pressure sensor detachably connected to the main block, and a protective spring detachably connected between the secondary block and the rear pressure sensor.

[0024] By adopting the above technical solution, before the detection begins, the probe of the roughness meter is placed as close as possible to the surface of the crankshaft balance block facing the power shaft to fully detect the circumferential outer wall of the power shaft. This also prevents the pressure between the probe of the roughness meter and the crankshaft balance block from being too large, ensuring that the probe of the roughness meter is not easily subjected to large radial forces.

[0025] Optionally, one of the positioning members is detachably connected to a front infrared sensor and the other positioning member is detachably connected to a front detection block, the front detection block is formed with a front detection hole that can be faced by the front infrared sensor, the surface of the front detection block facing away from the front infrared sensor is fixedly connected to a rear infrared sensor, and a rear detection hole that can be faced by the rear infrared sensor is formed at the rotation axis of the mounting member, and when the front infrared sensor is facing the front detection hole, the two positioning members press against the power shaft with the smallest diameter that can be detected.

[0026] By adopting the above-mentioned technical solution, before the positioning member positions the crankshaft, the two positioning members move first until the front infrared sensor is aligned with the front detection hole. At this time, the positioning member moves to the maximum stroke, and then depends on whether the rear infrared sensor is facing the rear detection hole, that is, whether the rear infrared sensor can output a preset distance value, to judge whether the center line between the two positioning members after moving the farthest distance is consistent with the rotation axis of the mounting member, so as to ensure that the two positioning members adjust the power shafts of different diameters within the detection range to a state consistent with the rotation axis of the mounting member.

[0027] In summary, the present application includes at least the following beneficial effects.

[0028] When testing crankshafts of different specifications, the radial displacement block is moved until the crankshaft power shaft axis and the rotation axis of the mounting part are consistent, so as to adapt to the roughness testing of crankshafts of different specifications within a certain range using the same equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of this application; Figure 2 It is a structural schematic diagram of a partial cross-section of a radial slider; Figure 3 It is a structural diagram of the workbench where two wire levers are set; Figure 4 yes Figure 2 Enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the structure of the mobile device.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. Mounting part; 2. Rotating motor; 21. Front detection block; 22. Front detection hole; 23. Rear detection hole; 24. Orienting rod; 25. Workbench; 3. Roughness meter; 31. Instrument block; 32. Radial displacement screw; 33. Screw control; 34. Main block; 35. Sub-block; 36. Rear pressure sensor; 37. Protection spring; 38. Front infrared sensor; 39. Rear infrared sensor; 4. Moving device; 41. Fixed rack; 42. Radial rack; 43. Radial slider; 44. Rotating block; 45. Rotating control; 46. Moving end face gear disc; 47. Fixed end face gear disc; 48. Shaft shifting platform; 49. Shaft shifting electric cylinder; 5. Radial displacement block; 51. Chuck; 52. Radial control; 53. Positioning part; 54. Positioning motor; 55. Bidirectional screw; 56. Screw lever; 57. Front pressure sensor; 59. Rack rod. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings.

[0032] The present application embodiment discloses a crankshaft roughness detection device, referring to Figure 1 and Figure 2 , including a workbench 25 placed on the ground, the workbench 25 is detachably connected to a rotary motor 2, the output shaft of the rotary motor 2 is coaxially detachably connected to a disc-shaped mounting member 1, the mounting member 1 is connected to a radial displacement block 5 along its own radial sliding, a chuck 51 is installed on the side of the radial displacement block 5 away from the rotary motor 2, the chuck 51 clamps and fixes the connecting rod journal of the crankshaft so that the axis of the crankshaft power shaft is consistent with the axis of the mounting member 1. There is also a roughness meter 3 above the workbench 25, with a stylus that is horizontal and abuts against the circumferential surface of the power shaft at half the height, and a moving device 4 that enables the roughness meter 3 to move in a horizontal plane is also installed on the workbench 25, so that the stylus of the roughness meter 3 can more comprehensively contact the circumferential outer wall of the power shaft, so as to perform a more comprehensive roughness detection on the power shaft.

[0033] Reference Figure 3The workbench 25 is slidably connected with two screw levers 56, and the moving direction of the screw levers 56 is the horizontal radial direction of the mounting member 1. The workbench 25 is rotatably connected with a bidirectional screw 55 threadedly connected to the bottom ends of the two screw levers 56. The thread directions on both sides of the center point of the bidirectional screw 55 are opposite. The two screw levers 56 and the center points of the bidirectional screw 55 are equal. The workbench 25 is detachably connected with a positioning motor 54 whose output shaft is coaxially detachably connected to the bidirectional screw 55. The upper ends of the two screw levers 56 are both installed with positioning members 53 with a vertical surface in a V shape. The two ends of one positioning member 53 can be slidably connected to the two ends of the other positioning member 53 in a one-to-one correspondence. The middle corner parts of the two positioning members 53 are far away from each other, and the center line between the two positioning members 53 is consistent with the axis of the mounting member 1. After the end of the connecting rod journal is clamped and fixed by the chuck 51, the two positioning members 53 are close to each other until the power shaft is pressed against a total of four surface positions of the two positioning members 53, and the axis of the power shaft is consistent with the axis of the mounting member 1.

[0034] Reference Figure 3 The two positioning members 53 are vertically inserted into the upper end of the wire lever 56 on one side away from each other, and the upper ends of the two wire levers 56 are both equipped with front pressure sensors 57. The detection ends of the two front pressure sensors 57 are respectively in contact with the side away from each other of the two positioning members 53. The front pressure sensors 57 are electrically connected to an external controller so that when the pressure value detected by the front pressure sensors 57 is greater than the pressure threshold preset in the external controller, the external controller stops the operation of the positioning motor 54.

[0035] Reference Figure 2 and Figure 4 The radial displacement block 5 includes a radial slider 43 slidably connected to the mounting member 1. The radial slider 43 is rotatably connected to a rotating block 44 on the side facing the chuck 51. The rotating axis of the rotating block 44 is consistent with the rotating axis of the mounting member 1. The chuck 51 is detachably connected to the side of the rotating block 44 away from the radial slider 43. A movable end face toothed disc 46 coaxially fixedly connected to the rotating block 44 is rotatably connected inside the radial slider 43. The movable end face toothed disc 46 can mesh with a fixed end face toothed disc 47. The fixed end face toothed disc 47 is fixedly connected to an orientation rod 24. The orientation rod 24 is slidably connected to the radial slider 43 along the direction of the rotating axis of the rotating block 44. The outer periphery of the orientation rod 24 is rectangular, so that the orientation rod 24 is difficult to rotate. One end of the directional rod 24 away from the fixed end face toothed disc 47 is threadedly connected to a turn control unit 45, which is rotatably connected to the radial slider 43. The turn control unit 45 can be rotated using an Allen wrench so that the fixed end face toothed disc 47 remains away from the movable end face toothed disc 46 during the process of the two positioning members 53 approaching each other.

[0036] Reference Figure 4The mounting member 1 is fixedly connected with a radial rack 42 along the moving direction of the radial slider 43, the radial rack 42 can mesh with a fixed rack 41, the fixed rack 41 is fixedly connected with a rack rod 59 slidably connected to the radial slider 43, the sliding direction of the rack rod 59 is perpendicular to the sliding direction of the radial slider 43, the radial slider 43 is rotatably connected with a radial control member 52 threadedly connected to the rack rod 59, the radial control member 52 can be rotated using an Allen wrench, so that when the two positioning members 53 are approaching, the fixed rack 41 remains away from the radial rack 42.

[0037] Reference Figure 3 , a front infrared sensor 38 is detachably connected to the middle turning point of a positioning member 53, a front detection block 21 is detachably connected to the middle turning point of the positioning member 53 away from the front infrared sensor 38, and a front detection hole 22 that can be directly facing the front infrared sensor 38 is opened on the vertical surface of the front detection block 21 away from the mounting member 1. And a rear infrared sensor 39 is detachably connected to the surface of the front detection block 21 away from the front infrared sensor 38, and a rear detection hole 23 that can be directly facing the rear infrared sensor 39 is opened at the center of the mounting member 1. Both the front infrared sensor 38 and the rear infrared sensor 39 are electrically connected to the external controller.

[0038] Before one end of the connecting rod journal of the crankshaft is fixed by the chuck 51, the positioning motor 54 is first operated to move the two positioning members 53 to the maximum stroke. At this time, the two positioning members 53 can just clamp the power shaft with the minimum diameter that can be detected. Then the front infrared sensor 38 detects the distance of the front detection block 21. If the distance value detected by the front infrared sensor 38 is equal to the distance value preset in the external controller, it means that the front infrared sensor 38 is facing the front detection hole 22 at this time, and the two positioning members 53 keep synchronization without deviation during the movement of the maximum stroke. Then the rear infrared sensor 39 detects the distance of the mounting member 1. If the distance value detected by the rear infrared sensor 39 is equal to the distance value preset in the external controller, it means that the rear infrared sensor 39 is facing the rear detection hole 23 at this time, and the rotation axis of the mounting member 1 is consistent with the center line between the two positioning members 53. Then the crankshaft can be fixed and the roughness detection can be started.

[0039] Reference Figure 1 and Figure 5The moving device 4 includes an axial shifting platform 48 slidably connected to the workbench 25 along the axial direction of the mounting member 1, and the workbench 25 is detachably connected to an axial shifting electric cylinder 49 whose power rod is detachably connected to the axial shifting platform 48. The axial shifting platform 48 is installed with an instrument block 31, and the instrument block 31 includes a main block 34 slidably connected to the upper surface of the axial shifting platform 48 along the horizontal radial direction of the mounting member 1, and the main block 34 is slidably connected to the auxiliary block 35 along the axial direction of the mounting member 1, and the main block 34 is also detachably connected to the rear pressure sensor 36, and a protective spring 37 is detachably connected between the rear pressure sensor 36 and the auxiliary block 35. The auxiliary block 35 is closer to the mounting member 1 than the rear pressure sensor 36, and the protective spring 37 forces the auxiliary block 35 to stay away from the rear pressure sensor 36, and the roughness meter 3 is detachably connected to the auxiliary block 35. In addition, the main block 34 is threadedly connected to a radial displacement screw 32 rotatably connected to an axial displacement platform 48 , and the axial displacement platform 48 is rotatably connected to a screw control 33 coaxially fixedly connected to the radial displacement screw 32 , and the screw control 33 can be rotated using an Allen wrench.

[0040] After the crankshaft is positioned, the lead screw control 33 is first rotated to make the feeler needle of the roughness meter 3 contact the circumferential outer wall of the power shaft, and then the shaft shifting cylinder 49 is operated to move the roughness meter 3 toward the mounting part 1 until the feeler needle of the roughness meter 3 contacts the balance block of the crankshaft, so that the rear pressure sensor 36 electrically connected to the external controller detects the pressure change. When the pressure value detected by the rear pressure sensor 36 is equal to the pressure threshold preset in the external controller, the shaft shifting cylinder 49 stops running, and then the rotating motor 2 runs for a predetermined time, and then the shaft shifting cylinder 49 starts running synchronously, so that the roughness meter 3 moves away from the mounting part 1 until the feeler needle of the roughness meter 3 no longer contacts the power shaft.

[0041] The implementation principle of the crankshaft roughness detection device of the embodiment of the present application is as follows: the positioning motor 54 is operated first, so that the two positioning members 53 move to the maximum stroke, and when the front infrared sensor 38 is aligned with the front detection hole 22 and the rear infrared sensor 39 is aligned with the rear detection hole 23, the two positioning members 53 are reset and the crankshaft is fixed. At the same time, the front infrared sensor 38, the front detection block 21 and the rear infrared sensor 39 are disassembled.

[0042] The connecting rod journal of the crankshaft is clamped and fixed by the chuck 51, and then the positioning motor 54 is operated to make the two positioning members 53 approach each other until the pressure value detected by the front pressure sensor 57 is equal to the preset pressure threshold value, and then the positioning motor 54 stops moving, and then the rotary control 45 and the radial control 52 are rotated to make the fixed end face gear disc 47 mesh with the movable end face gear disc 46 and the fixed rack 41 mesh with the radial rack 42, and then the two positioning members 53 are moved away from each other. Then the lead screw control 33 is rotated to make the stylus of the roughness meter 3 contact the circumferential outer wall of the power shaft, and then the shaft moving electric cylinder 49 is operated to make the roughness meter 3 move toward the mounting member 1 until the stylus of the roughness meter 3 contacts the balance block of the crankshaft. Then the rotary motor 2 first runs for a predetermined time, and then the shaft moving electric cylinder 49 starts to run, so that the roughness meter 3 is away from the mounting member 1 until the stylus of the roughness meter 3 no longer contacts the power shaft.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A crankshaft roughness detection device, comprising a mounting member (1) for fixing the position of the crankshaft, a rotating motor (2) for rotating the mounting member (1) to drive a power shaft to rotate, a roughness meter (3) with a stylus in contact with the circumferential surface of the power shaft, and a moving device (4) for moving the roughness meter (3), characterized in that: The mounting member (1) is slidably connected to a radial displacement block (5) along the radial direction of the output shaft of the rotary motor (2); the radial displacement block (5) is provided with a chuck (51) for clamping and fixing the connecting rod journal; and the radial displacement block (5) is provided with a radial control unit (52) for fixing the position of the radial displacement block (5).

2. A crankshaft roughness detection device according to claim 1, characterized in that: There are two positioning members (53) on the side of the chuck (51) facing the roughness meter (3), the positioning members (53) are V-shaped, the center line between the two positioning members (53) is consistent with the output shaft axis of the rotating motor (2), the two ends of one positioning member (53) are slidably connected to the two ends of the other positioning member (53) in a one-to-one correspondence, and the two positioning members (53) are provided with a positioning motor (54) that allows the two positioning members (53) to move closer or farther away.

3. A crankshaft roughness detection device according to claim 2, characterized in that: The output shaft of the positioning motor (54) is coaxially and detachably connected to a bidirectional lead screw (55), the bidirectional lead screw (55) is threadedly connected to two lead levers (56), the two positioning members (53) are connected to adjacent side surfaces of the two lead levers (56) in a one-to-one correspondence, and the thread directions of the bidirectional lead screw (55) at the connection position of the two lead levers (56) are opposite.

4. A crankshaft roughness detection device according to claim 3, characterized in that: The positioning member (53) is plugged into the wire lever (56), and a front pressure sensor (57) for the positioning member (53) to abut is provided in the wire lever (56).

5. The crankshaft roughness detection device according to claim 2, characterized in that: The radial control unit (52) is threadedly connected to a rack rod (59) slidably connected to the radial displacement block (5); the rack rod (59) is fixedly connected to a fixed rack (41); and the mounting member (1) is fixedly connected to a radial rack (42) for engagement with the fixed rack (41).

6. A crankshaft roughness detection device according to claim 2, characterized in that: The radial displacement block (5) comprises a radial slider (43) slidably connected to the mounting member (1) and a rotating block (44) rotatably connected to the radial slider (43) and connected to the chuck (51); the rotating axis of the rotating block (44) is the same as the center line of the chuck (51); the radial slider (43) is provided with a rotating control unit (45) for limiting the random rotation of the rotating block (44).

7. A crankshaft roughness detection device according to claim 6, characterized in that: A movable end face toothed disc (46) coaxially fixedly connected to a rotating block (44) is rotatably connected inside the radial slider (43); the movable end face toothed disc (46) meshes with a fixed end face toothed disc (47) rotatably connected to the rotating block (44); the fixed end face toothed disc (47) is fixedly connected to a directional rod (24) slidably connected inside the radial slider (43); and the rotating control unit (45) is rotatably connected to the radial slider (43) and is threadedly connected to the directional rod (24).

8. The crankshaft roughness detection device according to claim 1, characterized in that: The moving device (4) comprises an axial shifting platform (48) that moves along the axis direction of the rotating motor (2), an axial shifting electric cylinder (49) that drives the axial shifting platform (48) to move, an instrument block (31) that is radially slidably connected to the axial shifting platform (48) along the output shaft of the rotating motor (2) and for mounting the roughness meter (3), a radial shifting lead screw (32) that is rotatably connected to the axial shifting platform (48) and threadedly connected to the instrument block (31), and a lead screw control (33) that is rotatably connected to the axial shifting platform (48) and coaxially fixedly connected to the radial shifting lead screw (32).

9. A crankshaft roughness detection device according to claim 8, characterized in that: The instrument block (31) comprises a main block (34) slidably connected to the axial displacement platform (48) and threadedly connected to the radial displacement screw (32), a secondary block (35) slidably connected to the main block (34) along the sliding direction of the axial displacement platform (48) and for connecting the roughness meter (3), a rear pressure sensor (36) detachably connected to the main block (34), and a protection spring (37) detachably connected between the secondary block (35) and the rear pressure sensor (36).

10. The crankshaft roughness detection device according to claim 2, characterized in that: One of the positioning members (53) is detachably connected to a front infrared sensor (38) and the other positioning member (53) is detachably connected to a front detection block (21); the front detection block (21) is formed with a front detection hole (22) capable of facing the front infrared sensor (38); a rear infrared sensor (39) is fixedly connected to a surface of the front detection block (21) facing away from the front infrared sensor (38); a rear detection hole (23) capable of facing the rear infrared sensor (39) is formed at the rotation axis of the mounting member (1); when the front infrared sensor (38) faces the front detection hole (22), the two positioning members (53) are pressed against a power shaft of a minimum diameter that can be detected.

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