Automatic feeding and conveying device for optical modem performance test

Abstract

The invention discloses an automatic feeding and conveying device for optical modem performance testing, and relates to the field of optical modem performance testing, the automatic feeding and conveying device comprises a posture adjusting conveying belt, the posture adjusting conveying belt is provided with an inclined posture adjusting plane, and the posture adjusting plane is obliquely arranged in the conveying direction perpendicular to the posture adjusting conveying belt; the output end of the posture adjusting conveying belt is provided with four sets of position detection assemblies, the detection assemblies comprise color sensors, the arrangement heights of the color sensors in the four sets of position detection assemblies are different, and color marks are painted on the four side walls of the optical modem shell. The arrangement heights of the color marks on the four side walls are in one-to-one correspondence with the arrangement heights of the four color sensors, and the color sensors can only identify the color marks with the same height as the color sensors, so that the direction of the optical modem can be judged through the response of the corresponding color sensors, and the rotating table is controlled to rotate by a corresponding angle according to the direction of the optical modem. Therefore, accurate feeding of the optical modem can be realized.

Description

Technical Field

[0001] The present invention relates to the field of optical modem performance testing, and specifically to an automatic feeding and conveying device for optical modem performance testing. Background Art

[0002] An optical modem, also known as a single-port optical terminal, is a three-piece fiber optic transmission device developed for special user environments. This device uses large-scale integrated chips, has a simple circuit, low power consumption, high reliability, and has a complete alarm status indication and perfect network management function. Before leaving the factory, the optical modem needs to be subjected to performance testing first. If the test is qualified, it will be packaged and shipped out of the factory. If the test is unqualified, it will enter the repair process. In the performance testing of the optical modem, the optical modem needs to be conveyed to the testing machine through a conveying mechanism. After the optical modem is output from the previous workstation, it is conveyed on the conveying device with different postures, and at the same time, the position of the optical modem will also change during the conveying process. However, the current conveying device cannot adjust the posture of the optical modem, resulting in the optical modem not being able to accurately correspond to the testing station of the testing machine after being loaded onto the testing machine, thus affecting the testing operation. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an automatic feeding and conveying device for optical modem performance testing to solve the deficiencies of the prior art.

[0004] The purpose of the present invention is achieved through the following technical solutions: An automatic feeding and conveying device for optical modem performance testing includes an attitude adjustment conveyor belt. The attitude adjustment conveyor belt has an inclined attitude adjustment plane, and the attitude adjustment plane is inclined along a direction perpendicular to the conveying direction of the attitude adjustment conveyor belt. The input end and the output end of the attitude adjustment conveyor belt are both provided with horizontal conveying surfaces. A position detection component is arranged on the horizontal conveying surface at the output end of the attitude adjustment conveyor belt. There are four groups of the position detection components, and the four groups of the position detection components are arranged at intervals along the conveying direction of the attitude adjustment conveyor belt. The detection component includes a color sensor, and the arrangement heights of the color sensors in the four groups of the position detection components are different. Color marks are sprayed on the four side walls of the optical modem housing, and the arrangement heights of the color marks on the four side walls correspond one-to-one to the arrangement heights of the four color sensors. The conveying attitude of the optical modem is reflected by the response of a certain color sensor.

[0005] Furthermore, the attitude adjustment conveyor belt includes a conveyor frame, an input roller, an output roller, inclined rollers, horizontal rollers, and a conveyor belt. The input roller, inclined rollers, and horizontal rollers are rotatably arranged on the conveyor frame in sequence along the conveying direction of the optical modem. At least two inclined rollers are provided. Horizontal rollers are rotatably arranged between the input roller and the inclined rollers, and between the output roller and the inclined rollers. The conveyor belt is sleeved on the input roller, output roller, inclined rollers, and horizontal rollers. A horizontal conveying surface is formed between the input roller and the nearest horizontal roller, and between the output roller and the nearest horizontal roller. An attitude adjustment plane is formed between the inclined rollers.

[0006] Furthermore, each inclined roller corresponds to two pressing shafts. The two pressing shafts are respectively arranged at both ends of the inclined roller. The pressing shafts are rotatably connected to the conveyor frame. The pressing shafts are located above the inclined roller to press the conveyor belt.

[0007] Furthermore, a plurality of vibrators are installed on the conveyor frame in the area of the attitude adjustment plane.

[0008] Furthermore, a position adjustment mechanism is provided at the output end of the attitude adjustment conveyor belt. The position adjustment mechanism includes a base and a rotating table. The rotating table is rotatably installed on the base. The top surface of the rotating table is flush with the horizontal conveying surface at the output end of the attitude adjustment conveyor belt.

[0009] Furthermore, a positioning mechanism is provided on the rotating table. The positioning mechanism includes a positioning end plate and positioning side plates. The positioning end plate is fixed to the top of the rotating table. The positioning side plates are fixed on both sides of the top surface of the rotating table. The positioning side plates are perpendicular to the positioning end plate. A positioning push plate is arranged between the two positioning side plates. The positioning push plate moves along a direction perpendicular to the conveying direction of the attitude adjustment conveyor belt.

[0010] Furthermore, a positioning cylinder is installed on one of the positioning side plates. The telescopic shaft of the positioning cylinder passes through the positioning side plate and is connected to the positioning push plate.

[0011] Furthermore, a conveying groove is formed through the rotating table along its height direction. A first shaft and a second shaft are arranged at intervals along the conveying direction of the attitude adjustment conveyor belt in the conveying groove. The first shaft and the second shaft are both rotatably connected to the rotating table. The first shaft is connected to the second shaft through a belt drive. A motor is installed on the side wall of the rotating table. The output shaft of the motor is drivingly connected to the first shaft.

[0012] Further, a rotating main shaft is fixed to the bottom of the rotating table, an installation hole is formed in the top of the base, the rotating main shaft is rotationally assembled in the installation hole through a bearing, a driving motor is installed on the base, an output shaft of the driving motor is connected with a driving gear, a driven gear is sleeved on the rotating main shaft, and the driving gear meshes with the driven gear.

[0013] Further, a positioning groove is formed in the side wall of the installation hole, an electromagnet is installed in the positioning groove, a positioning cone is slidably arranged in the positioning groove, four positioning holes are uniformly distributed on the side wall of the rotating main shaft along the circumferential direction of the rotating main shaft, a permanent magnet is connected to one end of the positioning cone close to the electromagnet, the electromagnet is energized to generate a magnetic pole opposite to that of the permanent magnet, a spring is arranged in the positioning groove, and one end of the positioning cone far from the permanent magnet is fitted into one of the positioning holes.

[0014] The beneficial effects of the present invention are as follows:

[0015] The attitude adjustment conveyor belt guides the optical network terminal through the attitude adjustment plane. In cooperation with the vibration generated by the vibrator, while the optical network terminal is being conveyed forward, it also slides towards the bottom end of the attitude adjustment plane, so that the side wall of the optical network terminal contacts the conveying rack to complete the alignment of the optical network terminal. When the optical network terminal is conveyed to the horizontal conveying surface at the output end of the attitude adjustment conveyor belt, the color mark on the optical network terminal housing is within the detection range of the color sensor. The color sensor can only recognize the color mark at the same height as itself. Therefore, the orientation of the optical network terminal can be judged through the response of the corresponding color sensor, and the rotating table is controlled to rotate by a corresponding angle according to the orientation of the optical network terminal, so as to realize the precise feeding of the optical network terminal. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an automatic feeding and conveying device for optical network terminal performance testing according to the present invention;

[0017] Figure 2 is a partial structural diagram of the conveying rack in an automatic feeding and conveying device for optical network terminal performance testing according to the present invention;

[0018] Figure 3 is a schematic structural diagram of the position adjustment mechanism in an automatic feeding and conveying device for optical network terminal performance testing according to the present invention;

[0019] Figure 4 is a schematic structural diagram of the rotating table in an automatic feeding and conveying device for optical network terminal performance testing according to the present invention;

[0020] Figure 5 is a top view of the position adjustment mechanism in an automatic feeding and conveying device for optical network terminal performance testing according to the present invention;

[0021] Figure 6 is Figure 5Cross-sectional view taken along line B-B;

[0022] Figure 7 is Figure 6 Enlarged view of portion A;

[0023] In the figure, 1 - attitude-adjusting conveyor belt, 2 - attitude-adjusting plane, 3 - horizontal conveying plane, 4 - color sensor, 5 - conveying rack, 6 - input roller, 7 - output roller, 8 - inclined roller, 9 - horizontal roller, 10 - conveying belt, 11 - pressing shaft, 12 - base, 13 - rotating table, 14 - positioning end plate, 15 - positioning side plate, 16 - positioning push plate, 17 - positioning cylinder, 18 - conveying chute, 19 - first shaft, 20 - second shaft, 21 - motor, 22 - rotating main shaft, 23 - mounting hole, 24 - driving motor, 25 - driving gear, 26 - driven gear, 27 - positioning groove, 28 - electromagnet, 29 - positioning cone, 30 - positioning hole, 31 - permanent magnet, 32 - spring. Specific embodiments

[0024] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0025] Embodiment 1

[0026] As Figures 1 to 7As shown in the figure, an automatic feeding and conveying device for optical modem performance testing includes an attitude adjustment conveyor belt 1. The attitude adjustment conveyor belt 1 has an inclined attitude adjustment plane 2. The attitude adjustment plane 2 is inclined along the direction perpendicular to the conveying direction of the attitude adjustment conveyor belt 1. Both the input end and the output end of the attitude adjustment conveyor belt 1 are provided with horizontal conveying surfaces 3. A position detection component is arranged on the horizontal conveying surface 3 at the output end of the attitude adjustment conveyor belt 1. There are four groups of position detection components, and the four groups of position detection components are arranged at intervals along the conveying direction of the attitude adjustment conveyor belt 1. The detection component includes a color sensor 4. The arrangement heights of the color sensors 4 in the four groups of position detection components are different. Color marks are painted on the four side walls of the optical modem housing, and the arrangement heights of the color marks on the four side walls correspond one by one to the arrangement heights of the four color sensors 4. The conveying attitude of the optical modem is reflected by the response of a certain color sensor 4. A plurality of exciters are installed on the conveying frame 5 in the area of the attitude adjustment plane 2. The optical modems processed by the previous workstation are sent to the testing workstation through the attitude adjustment conveyor belt 1. The optical modems are guided by the attitude adjustment plane 2 of the attitude adjustment conveyor belt 1. With the vibration generated by the exciters, while the optical modems are being conveyed forward, they also slide towards the bottom end of the attitude adjustment plane 2, so that the side walls of the optical modems contact the conveying frame of the attitude adjustment conveyor belt 1 to complete the alignment of the optical modems. When the optical modems are conveyed to the horizontal conveying surface 3 at the output end of the attitude adjustment conveyor belt 1, the color marks on the optical modem housing are within the detection range of the color sensor 4. The color sensor 4 can only recognize the color marks at the same height as itself. Thus, the orientation of the optical modem can be judged through the response of the corresponding color sensor 4. By adjusting the feeding orientation according to the orientation of the optical modem, accurate feeding of the optical modem can be achieved.

[0027] Embodiment 2

[0028] On the basis of Embodiment 1, as Figures 1 to 7 shown, a position adjustment mechanism is arranged at the output end of the attitude adjustment conveyor belt 1. The position adjustment mechanism includes a base 12 and a rotating table 13. The rotating table 13 is rotatably installed on the base 12. The top surface of the rotating table 13 is flush with the horizontal conveying surface 3 at the output end of the attitude adjustment conveyor belt 1. The optical modems that have passed the position detection are conveyed from the attitude adjustment conveyor belt 1 to the rotating table 13. According to the position information of the optical modems detected by the color sensor 4, the rotating table 13 rotates a certain angle correspondingly, so that the positions of the optical modems are directly in the feeding state. The optical modems can be accurately fed to the testing station directly through a feeding robotic arm or other feeding mechanisms.

[0029] Further, a rotating main shaft 22 is fixed to the bottom of the rotating table 13. An installation hole 23 is formed in the top of the base 12. The rotating main shaft 22 is rotationally assembled in the installation hole 23 through a bearing. A driving motor 24 is installed on the base 12. The output shaft of the driving motor 24 is connected with a driving gear 25. A driven gear 26 is sleeved on the rotating main shaft 22. The driving gear 25 meshes with the driven gear 26. The driving motor 24 drives the rotating main shaft 22 to rotate through the meshing of the driving gear 25 and the driven gear 26. The rotating main shaft 22 drives the rotating table 13 to rotate, so as to correspondingly adjust the orientation of the optical network terminal according to the position information of the optical network terminal, and make it in the feeding state.

[0030] Embodiment 3

[0031] On the basis of Embodiment 2, as Figures 1 to 7 shown, a positioning mechanism is arranged on the rotating table 13. The positioning mechanism includes a positioning end plate 14 and positioning side plates 15. The positioning end plate 14 is fixed to the top of the rotating table 13. The positioning side plates 15 are fixed to both sides of the top surface of the rotating table 13. The positioning side plates 15 are perpendicular to the positioning end plate 14. A positioning push plate 16 is arranged between the two positioning side plates 15. The positioning push plate 16 moves along the conveying direction perpendicular to the attitude adjusting conveyor belt 1. A positioning cylinder 17 is installed on one of the positioning side plates 15. The telescopic shaft of the positioning cylinder 17 passes through the positioning side plate 15 and is connected with the positioning push plate 16. A conveying groove 18 is formed in the rotating table 13 along its height direction. A first shaft 19 and a second shaft 20 are arranged at intervals in the conveying groove 18 along the conveying direction of the attitude adjusting conveyor belt 1. Both the first shaft 19 and the second shaft 20 are rotatably connected with the rotating table 13. The first shaft 19 is connected with the second shaft 20 through belt transmission. A motor 21 is installed on the side wall of the rotating table 13. The output shaft of the motor 21 is drivingly connected with the first shaft 19. Although the position of the optical network terminal is adjusted on the attitude adjusting plane 2, it will still be offset during the process of being conveyed from the attitude adjusting conveyor belt 1 to the rotating table 13. Therefore, after the optical network terminal is conveyed to the rotating table 13, its position needs to be adjusted again. Before the position adjustment, first, according to the position information of the optical network terminal detected by the color sensor 4, the rotating table 13 rotates the optical network terminal by a certain angle correspondingly to make the feeding position of the optical network terminal correct. The motor 21 drives the first shaft 19 to rotate. The first shaft 19 drives the second shaft 20 to rotate through the belt. The optical network terminal is moved close to the positioning end plate 14 through belt transmission, so that the side wall of the optical network terminal contacts the positioning end plate 14. Then, the positioning cylinder 17 drives the positioning push plate 16 to move, so that the positioning push plate 16 pushes the optical network terminal to move close to one of the positioning side plates 15, and the other side wall of the optical network terminal contacts the positioning side plate 15, thereby completing the positioning of the optical network terminal and making it in the test waiting for feeding state.

[0032] Embodiment 4

[0033] On the basis of Embodiment 3, as Figures 1 to 7As shown, a positioning groove 27 is formed in the side wall of the mounting hole 23. An electromagnet 28 is installed in the positioning groove 27. A positioning cone 29 is slidably arranged in the positioning groove 27. Four positioning holes 30 are evenly distributed along the circumferential direction of the side wall of the rotating main shaft 22. One end of the positioning cone 29 close to the electromagnet 28 is connected with a permanent magnet 31. When the electromagnet 28 is energized, it generates a magnetic pole with a different magnetic property from that of the permanent magnet 31. A spring 32 is arranged in the positioning groove 27. One end of the positioning cone 29 away from the permanent magnet 31 is fitted into one of the positioning holes 30. Since the shape of the optical network terminal is a cuboid, after the optical network terminal is aligned on the rotating table 13, the optical network terminal can be adjusted to the feeding position by simply rotating the optical network terminal by 90°, 180° or 270°. To ensure that the rotating main shaft 22 can accurately rotate by 90°, 180° or 270°, the positioning cone 29 is provided. When it is necessary to rotate the rotating table 13, the electromagnet 28 is energized to attract the permanent magnet 31, so that the positioning cone 29 compresses the spring 32 and moves into the positioning groove 27, causing the positioning cone 29 to disengage from the positioning hole 30, so that the rotating main shaft 22 can smoothly drive the rotating table 13 to rotate. According to the rotation angle of the rotating main shaft 22, the energization time of the electromagnet 28 is controlled. When the rotating main shaft 22 is close to but has not reached the required rotation angle, the electromagnet 28 is powered off, so that the positioning cone 29 moves close to the rotating main shaft 22 under the reaction force of the spring 32, and the positioning cone 29 contacts the rotating main shaft 22. After the driving motor 24 drives the rotating main shaft 22 to rotate by a specified angle and stops, at this time, the positioning cone 29 is inserted into the positioning hole 30 of the rotating main shaft 22 under the action of the spring 32, thereby locking the rotating main shaft 22, avoiding the inertial drive of the rotating main shaft 22 to continue to deflect after the driving motor 24 stops, making the rotation accuracy of the rotating table 13 higher, and realizing the precise adjustment of the position of the optical network terminal.

[0034] Embodiment 5

[0035] On the basis of Embodiment 4, as Figure 1 and Figure 2As shown in the figure, the attitude adjustment conveyor belt 1 includes a conveyor frame 5, an input roller 6, an output roller 7, an inclined roller 8, a horizontal roller 9, and a conveyor belt 10. The input roller 6, the inclined roller 8, and the horizontal roller 9 are sequentially rotatably arranged on the conveyor frame 5 along the conveying direction of the optical modem. There are at least two inclined rollers 8. Horizontal rollers 9 are rotatably arranged between the input roller 6 and the inclined roller 8, and between the output roller 7 and the inclined roller 8. The conveyor belt 10 is sleeved on the input roller 6, the output roller 7, the inclined roller 8, and the horizontal roller 9. Horizontal conveying surfaces 3 are formed between the input roller 6 and the nearest horizontal roller 9, and between the output roller 7 and the nearest horizontal roller 9. An attitude adjustment plane 2 is formed between the inclined rollers 8. A stepping motor is installed on the conveyor frame 5. The output shaft of the stepping motor is drivingly connected to one end of the input roller 6. The input roller 6 is driven to rotate by the stepping motor. The input roller 6 drives the output roller 7, the inclined roller 8, and the horizontal roller 9 to rotate through the conveyor belt 10. Through the arrangement of multiple inclined rollers 8, the conveyor belt 10 forms an inclined attitude adjustment plane at the inclined roller 8, and the attitude adjustment conveyor belt 1 forms horizontal conveying surfaces 3 at both ends, which does not affect the normal input and output of the optical modem. The arrangement heights at both ends of the inclined roller 8 are different, so that the attitude adjustment plane 2 can be formed.

[0036] Further, each inclined roller 8 corresponds to two pressing shafts 11. The two pressing shafts 11 are respectively arranged at both ends of the inclined roller 8. The pressing shafts 11 are rotatably connected to the conveyor frame 5. The pressing shafts 11 are located above the inclined roller 8 and press the conveyor belt 10. The conveyor belt 10 is restricted between the inclined roller 8 and the pressing shaft 11, so that the conveyor belt 10 forms a stable attitude adjustment plane 2 at the inclined roller 8, which is used to adjust the position of the optical modem during the conveying process, so that the color mark on the side wall of the optical modem is within the detection range of the color sensor 4.

Claims

1. An automatic feeding and conveying device for optical modem performance testing, characterized in that, It includes an attitude adjustment conveyor belt (1), the attitude adjustment conveyor belt (1) has an inclined attitude adjustment plane (2), the attitude adjustment plane (2) is inclined along a direction perpendicular to the conveying direction of the attitude adjustment conveyor belt (1), horizontal conveying surfaces (3) are provided at both the input end and the output end of the attitude adjustment conveyor belt (1), a position detection component is provided on the horizontal conveying surface (3) at the output end of the attitude adjustment conveyor belt (1), there are four groups of the position detection components, and the four groups of the position detection components are arranged at intervals along the conveying direction of the attitude adjustment conveyor belt (1). The detection component includes a color sensor (4), and the arrangement heights of the color sensors (4) in the four groups of the position detection components are different. Color marks are sprayed on the four side walls of the optical modem housing, and the arrangement heights of the color marks on the four side walls correspond one-to-one with the arrangement heights of the four color sensors (4). The conveying attitude of the optical modem is reflected by the response of a certain color sensor (4).

2. The automatic feeding and conveying device for optical modem performance testing according to claim 1, wherein The attitude adjustment conveyor belt (1) includes a conveying frame (5), an input roller (6), an output roller (7), inclined rollers (8), horizontal rollers (9) and a conveying belt (10). The input roller (6), the inclined rollers (8) and the horizontal rollers (9) are rotatably arranged on the conveying frame (5) in sequence along the conveying direction of the optical modem. At least two inclined rollers (8) are provided. Horizontal rollers (9) are rotatably arranged between the input roller (6) and the inclined rollers (8) and between the output roller (7) and the inclined rollers (8). The conveying belt (10) is sleeved on the input roller (6), the output roller (7), the inclined rollers (8) and the horizontal rollers (9). The horizontal conveying surfaces (3) are formed between the input roller (6) and the nearest horizontal roller (9) and between the output roller (7) and the nearest horizontal roller (9). The attitude adjustment plane (2) is formed between the inclined rollers (8).

3. The automatic feeding and conveying device for optical modem performance testing according to claim 2, wherein Each inclined roller (8) corresponds to two pressing shafts (11), and the two pressing shafts (11) are respectively arranged at both ends of the inclined roller (8). The pressing shafts (11) are rotatably connected to the conveying frame (5), and the pressing shafts (11) are located above the inclined rollers (8) to press the conveying belt (10).

4. The automatic feeding and conveying device for optical modem performance testing according to claim 2, characterized in that, A plurality of vibrators are installed on the conveying frame (5) in the area of the attitude adjustment plane (2).

5. The automatic feeding and conveying device for optical modem performance testing according to claim 1, characterized in that, A position adjustment mechanism is provided at the output end of the attitude adjustment conveyor belt (1). The position adjustment mechanism includes a base (12) and a rotating table (13). The rotating table (13) is rotatably installed on the base (12), and the top surface of the rotating table (13) is flush with the horizontal conveying surface (3) at the output end of the attitude adjustment conveyor belt (1).

6. The automatic feeding and conveying device for optical modem performance testing according to claim 5, characterized in that, A positioning mechanism is provided on the rotating table (13). The positioning mechanism includes a positioning end plate (14) and positioning side plates (15). The positioning end plate (14) is fixed to the top of the rotating table (13). The positioning side plates (15) are fixed to both sides of the top surface of the rotating table (13). The positioning side plates (15) are perpendicular to the positioning end plate (14). A positioning push plate (16) is arranged between the two positioning side plates (15). The positioning push plate (16) moves along a direction perpendicular to the conveying direction of the attitude adjusting conveyor belt (1).

7. An automatic feeding and conveying device for optical modem performance testing according to claim 6, characterized in that, A positioning cylinder (17) is installed on one of the positioning side plates (15). The telescopic shaft of the positioning cylinder (17) passes through the positioning side plate (15) and is connected to the positioning push plate (16).

8. An automatic feeding and conveying device for optical modem performance testing according to claim 7, characterized in that, A conveying groove (18) is formed through the rotating table (13) along its height direction. A first shaft (19) and a second shaft (20) are arranged at intervals in the conveying groove (18) along the conveying direction of the attitude adjusting conveyor belt (1). Both the first shaft (19) and the second shaft (20) are rotatably connected to the rotating table (13). The first shaft (19) is connected to the second shaft (20) by belt drive. A motor (21) is installed on the side wall of the rotating table (13). The output shaft of the motor (21) is drivingly connected to the first shaft (19).

9. The automatic feeding and conveying device for optical modem performance testing according to claim 5, characterized in that, A rotating main shaft (22) is fixed to the bottom of the rotating table (13). An installation hole (23) is formed in the top of the base (12). The rotating main shaft (22) is rotatably assembled in the installation hole (23) through a bearing. A driving motor (24) is installed on the base (12). The output shaft of the driving motor (24) is connected to a driving gear (25). A driven gear (26) is sleeved on the rotating main shaft (22). The driving gear (25) meshes with the driven gear (26).

10. The automatic feeding and conveying device for optical modem performance testing according to claim 9, characterized in that, A positioning groove (27) is formed in the side wall of the installation hole (23). An electromagnet (28) is installed in the positioning groove (27). A positioning cone (29) is slidably arranged in the positioning groove (27). Four positioning holes (30) are evenly arranged on the side wall of the rotating main shaft (22) along its circumferential direction. One end of the positioning cone (29) close to the electromagnet (28) is connected to a permanent magnet (31). The electromagnet (28) is energized to generate a magnetic pole with a different polarity from that of the permanent magnet (31). A spring (32) is arranged in the positioning groove (27). The end of the positioning cone (29) away from the permanent magnet (31) is fitted in one of the positioning holes (30).

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