Auxiliary clamp for laser

Abstract

The utility model relates to the field of lasers, in particular to a laser auxiliary clamp which comprises a base, a driving part is fixedly connected to the base, a mounting plate is fixedly connected to the driving end of the driving part, an adjusting gear is rotationally connected to the mounting plate, and a mounting support is arranged at the top of the adjusting gear; a servo motor is arranged on the mounting plate, a driving shaft of the servo motor is fixedly connected with a driving gear, and the driving gear is meshed with the adjusting gear; the control panel is used for inputting a height adjusting signal and an angle adjusting signal; the signal processor is used for receiving the angle adjusting signal and outputting a driving turn number signal; the control panel is in signal connection with the signal input end of the driving part; the driving part receives a height adjusting signal and drives the mounting plate and the laser to lift; the signal processor is in signal connection with the servo motor, and the servo motor receives the driving turn number signal and rotates. According to the invention, the convenience of adjusting the height and angle of the laser by a user can be improved.

Description

Technical Field

[0001] The present application relates to the field of lasers, and in particular to a laser auxiliary fixture. Background Art

[0002] Laser is a device that uses the principle of stimulated radiation to amplify or oscillate light in certain excited substances to emit lasers. Lasers can be classified according to the gain medium into gas lasers, solid lasers, semiconductor lasers, fuel lasers, free electron lasers, etc. In the prior art, laser machines are often used in production and processing processes such as marking, printing, cutting, and photolithography.

[0003] The laser fixture was invented at the same time as the laser was invented, and is an indispensable device during the use of the laser. In the prior art, the common laser fixture mainly includes a base, a support rod and a mounting bracket. The mounting bracket includes two vertical rings, and a plurality of adjustment screws are arranged on the rings. The laser is fixed in the two rings. The user can adjust the angle and height of the laser through the adjustment screws on the rings to achieve the technical effect of adjusting the laser emission direction and emission angle.

[0004] However, when adjusting the position of the laser through the screw, it is rather cumbersome for the user to adjust the direction and angle of the laser through the screw, and repeated and multiple adjustments are required to achieve the desired effect. In addition, the end of the screw directly applies force to the laser, which can easily cause damage to the laser. There is room for improvement. Utility Model Content

[0005] In order to reduce the occurrence of damage to the laser during the laser adjustment process and improve the convenience of laser adjustment, the present application provides a laser auxiliary clamp.

[0006] The laser auxiliary fixture provided in this application adopts the following technical solution:

[0007] A laser auxiliary fixture comprises a base, a driving member is fixedly connected to the base, a driving end of the driving member is fixedly connected to a mounting plate, an adjusting gear is rotatably connected to the mounting plate, and a mounting bracket for mounting a laser is detachably and fixedly connected to the top wheel surface of the adjusting gear;

[0008] A servo motor is fixedly connected to the bottom of the mounting plate, a driving shaft of the servo motor passes through the mounting plate and extends to the top of the mounting plate, and one end of the driving shaft passing through the mounting plate is fixedly connected to a driving gear, and the driving gear is meshed with the adjusting gear; and:

[0009] A control panel, used to input height adjustment signals and angle adjustment signals;

[0010] A signal processor, whose signal input terminal is signal-connected to the signal output terminal of the control panel, and is used to receive the angle adjustment signal and output a driving turn number signal;

[0011] The signal output terminal of the control panel is connected to the signal input terminal of the driving member, and the driving member receives the height adjustment signal and drives the mounting plate and the laser to move toward or away from the base;

[0012] The signal output terminal of the signal processor is signal-connected to the signal input terminal of the servo motor, and the servo motor receives the driving revolution signal and rotates.

[0013] By adopting the above technical solution, after the user installs the laser on the fixture through the mounting bracket, the user can input the actual height instruction required for adjustment through the control panel on the base, and control the driving member to drive the mounting bracket together with the laser body to rise or fall a set distance; when the user needs to rotate the laser, the user inputs the actual required adjustment angle through the control panel, and the signal processor calculates the number of rotations of the driving gear according to the transmission ratio between the driving gear and the adjustment gear, and controls the driving gear to rotate the corresponding number of rotations in the required direction. Through the mutual coordination and use of the control panel, signal processor, driving member and servo motor, the user only needs to input the required height and angle through the control panel, the driving member can automatically drive the laser to rise and fall, and the servo motor can automatically drive the laser to rotate, the adjustment effect is accurate, and the user is exempted from repeated comparison and adjustment during the adjustment process, which effectively improves the convenience of adjusting the laser. At the same time, no force is directly applied to the laser for adjustment, which can effectively reduce the damage to the laser during the adjustment process.

[0014] Preferably, the driving member comprises a telescopic cylinder, a cylinder body of the telescopic cylinder is fixedly connected to the base, and a cylinder shaft of the telescopic cylinder is fixedly connected to the bottom of the mounting plate.

[0015] By adopting the above technical solution, the telescopic cylinder extends or retracts the cylinder axis, which can drive the mounting plate, mounting bracket and laser to move together in the direction closer to or away from the base. Combined with the control panel, the technical effect of adjusting the height of the laser can be achieved.

[0016] Preferably, the signal processor includes a single chip microcomputer.

[0017] By adopting the above technical solution, the single chip microcomputer can calculate the number of revolutions of the servo motor according to the transmission ratio between the driving gear and the adjusting gear and the actual required adjustment angle, thereby achieving the technical effect of automatically controlling the servo motor.

[0018] Preferably, the mounting bracket comprises a bottom plate, on which two positioning plates are adjustably arranged, and the two positioning plates are arranged opposite to each other;

[0019] Positioning half rings are detachably and fixedly connected to the opposite side walls of the two positioning plates, and any two opposite positioning half rings are clamped and fixed on the two sides of the laser respectively;

[0020] The tops of the two positioning plates are respectively fixedly connected with locking plates, and locking holes are coaxially opened on any two opposite locking plates.

[0021] By adopting the above technical solution, when installing the laser, the user can install the matching positioning half ring on the positioning plate according to the size and shape of the laser to be installed. Since the two positioning plates are adjustable on the bottom plate, the user can push the two positioning plates so that the positioning half ring on the sliding plate is pressed against the two sides of the laser. Then, through the locking holes on the locking plate of the positioning plate, the user can lock the two positioning plates with bolts and nuts, so that the positioning half ring on the positioning plate is clamped and fixed on both sides of the laser to achieve the technical effect of installing and fixing the laser. Since the positioning half ring is replaceable and the positioning plate is adjustable, the mounting bracket can be used to clamp lasers of different sizes and shapes, improving the usability of the fixture.

[0022] Preferably, an elastic rubber pad is fixedly connected to a side of the positioning half ring away from the positioning plate.

[0023] By adopting the above technical solution, the elastic rubber pad can increase the stability of the laser and reduce the damage caused to the laser by the positioning half ring.

[0024] Preferably, a mounting cavity is provided in the bottom plate, and a cover plate is detachably fixedly connected to the bottom plate, and the cover plate covers the top of the mounting cavity;

[0025] Two racks are slidably connected in the installation cavity, the ends of the two racks extend upward and are integrally formed with extension parts, the cover plate is provided with sliding holes for the two extension parts to slide, the two extension parts respectively penetrate the two sliding holes and are respectively fixedly connected to the two positioning plates;

[0026] A transmission gear is rotatably connected to the inner bottom wall of the installation cavity, and the two racks are respectively meshed with two sides of the transmission gear.

[0027] By adopting the above technical solution, through the mutual matching and use between the two racks and the transmission gear, when the user installs the laser, he pushes one of the positioning plates, and the rack on the positioning plate drives the transmission gear to rotate, which can drive the other rack to move in the opposite direction, and then drive the two positioning plates to move towards each other, so as to drive the two positioning semi-rings to engage on both sides of the laser. Then the user locks the two positioning plates with bolts and nuts, and the laser can be fixed in the middle of the bottom plate, which effectively improves the convenience of the user to install the laser. Among them, the sliding groove on the cover plate can provide conditions for the sliding of the extension part, and at the same time, it can limit the sliding trajectory of the two racks, reducing the occurrence of the two racks offset.

[0028] Preferably, a rotating shaft is fixedly connected to the bottom inner wall of the installation cavity, the transmission gear is coaxially sleeved on the rotating shaft, the top of the rotating shaft is fixedly connected to an anti-slip plate, and the two racks are located between the anti-slip plate and the bottom inner wall of the installation cavity.

[0029] By adopting the above technical solution, the anti-drop plate can limit the position of the transmission gear and the two racks, thereby reducing the occurrence of the gear and the two racks falling off.

[0030] Preferably, the bottoms of the two racks are integrally formed with a limiting portion, and the bottom inner walls of the mounting cavity are respectively provided with two limiting grooves matched with the limiting portion, and the two limiting grooves are respectively located on both sides of the rotating shaft, and the two limiting portions are respectively embedded in the two limiting grooves.

[0031] By adopting the above technical solution, since the bottom of the rack is integrally formed with a limiting portion and a limiting groove is opened on the inner bottom wall of the installation cavity, the movement trajectory of the two racks can be further restricted, thereby reducing the occurrence of deviation and skew of the two racks during the sliding process.

[0032] In summary, the laser-assisted clamp of the present application includes at least one of the following beneficial technical effects:

[0033] 1. Through the coordination and use of the control panel, telescopic cylinder, single-chip microcomputer, servo motor, driving gear and adjusting gear, the user only needs to input the required height and angle through the control panel, and the telescopic cylinder can drive the mounting bracket together with the laser body to move towards or away from the base according to the instruction. The single-chip microcomputer controls the servo motor to rotate the set number of circles in the set direction according to the actual required adjustment angle and the transmission ratio between the driving gear and the adjusting gear. The driving gear connected to the driving shaft of the servo motor drives the adjusting gear to rotate, which can achieve the technical effect of rotating the laser. While achieving precise adjustment of the laser height and angle, it saves the user from the manual repeated comparison and adjustment of the laser, and improves the convenience of the user to adjust the laser. Instead of directly applying force to the laser, force is applied to the mounting bracket on which the laser is installed, which can reduce the damage to the laser caused by adjusting the laser.

[0034] 2. Since the positioning half ring is detachably fixed on the two positioning plates, and the two positioning plates are adjustable and slidably set on the bottom plate through the rack and the transmission gear, the user can replace the positioning half ring according to the shape and size of the laser actually required to be installed, so that the mounting bracket is suitable for lasers of different sizes and shapes, effectively improving the scope of application of the fixture and improving the usability of the fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of the clamp.

[0036] Figure 2 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of the mounting bracket.

[0037] Figure 3 It is a schematic diagram of an embodiment of the present application for showing the internal structure of the base plate.

[0038] Figure 4 It is a schematic diagram of an embodiment of the present application for demonstrating the internal signal transmission of the clamp.

[0039] Explanation of the reference numerals in the accompanying drawings: 1. base; 11. control panel; 2. mounting plate; 3. adjusting gear; 4. mounting bracket; 41. bottom plate; 411. mounting cavity; 412. rotating shaft; 413. anti-slip plate; 414. limiting groove; 42. positioning plate; 421. extension portion; 43. positioning half ring; 44. locking plate; 441. locking hole; 45. elastic rubber pad; 46. cover plate; 461. sliding hole; 47. rack; 471. limiting portion; 48. transmission gear; 5. servo motor; 51. driving gear; 6. telescopic cylinder; 7. laser. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-4 This application is described in further detail.

[0041] Example

[0042] The present application embodiment discloses a laser auxiliary fixture. Figure 1 and Figure 2 The fixture mainly includes a base 1, a driving member is fixedly connected to the base 1, a driving end of the driving member is fixedly connected to a mounting plate 2, an adjusting gear 3 is rotatably connected to the mounting plate 2, and a mounting bracket 4 for mounting a laser 7 is detachably and fixedly connected to the top wheel surface of the adjusting gear 3.

[0043] A servo motor 5 is fixedly connected to the bottom of the mounting plate 2. The drive shaft of the servo motor 5 passes through the mounting plate 2 and extends to the top of the mounting plate 2. One end of the drive shaft passing through the mounting plate 2 is fixedly connected to a drive gear 51, which meshes with the adjustment gear 3.

[0044] And: a control panel 11, used for inputting a height adjustment signal and an angle adjustment signal; a signal processor, whose signal input terminal is connected to a signal output terminal of the control panel 11, used for receiving the angle adjustment signal and outputting a driving revolution number signal.

[0045] The signal output terminal of the control panel 11 is connected to the signal input terminal of the driving component. The driving component receives the height adjustment signal and drives the mounting plate 2 and the laser 7 to move toward or away from the base 1.

[0046] The signal output terminal of the signal processor is signal-connected to the signal input terminal of the servo motor 5 , and the servo motor 5 receives the driving revolution signal and rotates.

[0047] After the user installs the laser 7 on the fixture through the mounting bracket 4, the user can input the actual height adjustment instruction required through the control panel 11 on the base 1, and control the driving member to drive the mounting bracket 4 together with the laser 7 body to rise or fall a set distance; when the user needs to rotate the laser 7, the user inputs the actual required adjustment angle through the control panel 11, and the signal processor calculates the number of rotations of the driving gear 51 according to the transmission ratio between the driving gear 51 and the adjustment gear 3, and controls the driving gear 51 to rotate the corresponding number of times in the required direction.

[0048] Through the coordination and use of the control panel 11, the signal processor, the driving component and the servo motor 5, the user only needs to input the required adjustment height and angle through the control panel 11, the driving component can automatically drive the laser 7 to rise and fall, and the servo motor 5 can automatically drive the laser 7 to rotate. The adjustment effect is accurate, and the user is saved from repeated comparison and adjustment during the adjustment process, which effectively improves the convenience of adjusting the laser 7. At the same time, no force is directly applied to the laser 7 for adjustment, which can effectively reduce the damage to the laser 7 during the adjustment process.

[0049] In the embodiment of the present application, the driving member is a telescopic cylinder 6 , the cylinder body of the telescopic cylinder 6 is fixedly connected to the base 1 , and the cylinder shaft of the telescopic cylinder 6 is fixedly connected to the bottom of the mounting plate 2 .

[0050] The telescopic cylinder 6 extends or retracts the cylinder axis, which can drive the mounting plate 2, the mounting bracket 4 and the laser 7 to move toward or away from the base 1. Combined with the control panel 11, the technical effect of adjusting the height of the laser 7 can be achieved.

[0051] In some other embodiments, a structure of a motor with a rack 47 (or a screw rod), an electric telescopic rod, etc. may be used to replace the telescopic cylinder 6, which is not limited here.

[0052] Reference Figure 4 In the embodiment of the present application, the signal processor is a single chip microcomputer. It should be noted that the single chip microcomputer used in the embodiment of the present application is pre-loaded with a program for calculating the number of rotations of the servo motor 5 according to the actual required angle and the transmission arm between the driving gear 51 and the adjustment gear 3. This is a prior art and will not be described in detail here.

[0053] The single chip microcomputer can calculate the number of revolutions of the servo motor 5 according to the transmission ratio between the driving gear 51 and the adjusting gear 3 and the actual required adjustment angle, thereby achieving the technical effect of automatically controlling the servo motor 5 .

[0054] Reference Figure 1 and Figure 2 The mounting bracket 4 includes a bottom plate 41, on which two positioning plates 42 are adjustably arranged, and the two positioning plates 42 are arranged opposite to each other; positioning semi-rings 43 are detachably fixedly connected to the opposite side walls of the two positioning plates 42 by screws, and any two opposite positioning semi-rings 43 are respectively clamped and fixed on the two sides of the laser 7; locking plates 44 are respectively fixedly connected to the tops of the two positioning plates 42, and locking holes 441 for the rods of the bolts to pass through are coaxially opened on any two opposite locking plates 44.

[0055] When installing the laser 7, the user can install the matching positioning half ring 43 on the positioning plate 42 according to the size and shape of the laser 7 to be installed. Since the two positioning plates 42 are adjustable on the bottom plate 41, the user can push the two positioning plates 42 so that the positioning half ring 43 on the sliding plate is pressed against the two sides of the laser 7. Then, through the locking holes 441 on the locking plate 44 on the positioning plate 42, the user can lock the two positioning plates 42 with bolts and nuts so that the positioning half ring 43 on the positioning plate 42 is clamped and fixed on the two sides of the laser 7 to achieve the technical effect of installing and fixing the laser 7. Since the positioning half ring 43 is replaceable and the positioning plate 42 is adjustable, the mounting bracket 4 can be used to clamp lasers 7 of different sizes and shapes, thereby improving the usability of the fixture.

[0056] Reference Figure 2 An elastic rubber pad 45 is fixedly connected to one side of the positioning half ring 43 away from the positioning plate 42 .

[0057] The elastic rubber pad 45 can increase the stability of the laser 7 and reduce the damage to the laser 7 caused by the positioning half ring 43.

[0058] Reference Figure 2 and Figure 3 A mounting cavity 411 is provided in the bottom plate 41, and a cover plate 46 is detachably and fixedly connected to the bottom plate 41, and the cover plate 46 covers the top of the mounting cavity 411; two racks 47 are slidably connected in the mounting cavity 411, and the ends of the two racks 47 extend upward and are integrally formed with extension portions 421, and sliding holes 461 for the two extension portions 421 to slide are provided on the cover plate 46, and the two extension portions 421 respectively penetrate the two sliding holes 461 and are respectively fixedly connected to the two positioning plates 42; a transmission gear 48 is rotatably connected to the inner bottom wall of the mounting cavity 411, and the two racks 47 are respectively meshed with the two sides of the transmission gear 48.

[0059] Through the mutual coordination and use between the two racks 47 and the transmission gear 48, when the user installs the laser 7, he pushes one of the positioning plates 42, and the rack 47 on the positioning plate 42 drives the transmission gear 48 to rotate, which can drive the other rack 47 to move in the opposite direction, and then drive the two positioning plates 42 to move towards each other, so as to drive the two positioning semi-rings 43 to engage on both sides of the laser 7. Then the user locks the two positioning plates 42 with bolts and nuts, and the laser 7 can be fixed in the middle of the bottom plate 41, which effectively improves the convenience of the user to install the laser 7. Among them, the sliding groove on the cover plate 46 can provide conditions for the sliding of the extension part 421, and at the same time, it can limit the sliding track of the two racks 47, reducing the occurrence of the deviation of the two racks 47.

[0060] Reference Figure 3 A rotating shaft 412 is fixedly connected to the bottom inner wall of the installation cavity 411, and a transmission gear 48 is coaxially sleeved on the rotating shaft 412. An anti-slip plate 413 is fixedly connected to the top of the rotating shaft 412, and two racks 47 are located between the anti-slip plate 413 and the bottom inner wall of the installation cavity 411.

[0061] The anti-drop plate 413 can limit the positions of the transmission gear 48 and the two racks 47, thereby reducing the occurrence of the gear and the two racks 47 falling off.

[0062] Reference Figure 3The bottom of the two racks 47 are integrally formed with a limiting portion 471, and the bottom inner wall of the installation cavity 411 is respectively provided with two limiting grooves 414 adapted to the limiting portion 471, and the two limiting grooves 414 are respectively located on both sides of the rotating shaft 412, and the two limiting portions 471 are respectively embedded in the two limiting grooves 414.

[0063] Since the bottom of the rack 47 is integrally formed with a limiting portion 471 and the inner bottom wall of the mounting cavity 411 is provided with a limiting groove 414, the movement trajectory of the two racks 47 can be further limited to reduce the occurrence of deviation and skew of the two racks 47 during the sliding process.

[0064] The implementation principle of a laser auxiliary clamp in the embodiment of the present application is as follows: through the mutual coordination and use of the control panel 11, the telescopic cylinder 6, the single-chip microcomputer, the servo motor 5, the driving gear 51 and the adjusting gear 3, the user only needs to input the required height and angle through the control panel 11, and the telescopic cylinder 6 can drive the mounting bracket 4 together with the laser 7 body to move toward or away from the base 1 according to the instruction, and the single-chip microcomputer controls the servo motor 5 to rotate a set number of circles in the set direction according to the actual required adjustment angle and the transmission ratio between the driving gear 51 and the adjusting gear 3. The driving gear 51 connected to the driving shaft of the servo motor 5 drives the adjusting gear 3 to rotate, so as to achieve the technical effect of rotating the laser 7, and can achieve precise adjustment of the height and angle of the laser 7 while avoiding the user's manual repeated comparison and adjustment of the laser 7, thereby improving the convenience of the user in adjusting the laser 7, and does not directly apply force to the laser 7, but applies force to the mounting bracket 4 on which the laser 7 is installed, so as to reduce the damage to the laser 7 caused by adjusting the laser 7.

[0065] 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 laser-assisted fixture, characterized in that: The invention comprises a base (1), a driving member is fixedly connected to the base (1), a driving end of the driving member is fixedly connected to a mounting plate (2), an adjusting gear (3) is rotatably connected to the mounting plate (2), and a mounting bracket (4) for mounting a laser (7) is detachably fixedly connected to the top wheel surface of the adjusting gear (3); A servo motor (5) is fixedly connected to the bottom of the mounting plate (2); a drive shaft of the servo motor (5) passes through the mounting plate (2) and extends to the top of the mounting plate (2); and one end of the drive shaft passing through the mounting plate (2) is fixedly connected to a drive gear (51), and the drive gear (51) is meshed with the adjustment gear (3); as well as: A control panel (11), used for inputting a height adjustment signal and an angle adjustment signal; A signal processor, whose signal input end is signal-connected to the signal output end of the control panel (11), and is used to receive the angle adjustment signal and output a driving revolution number signal; The signal output end of the control panel (11) is signal-connected to the signal input end of the driving member, and the driving member receives the height adjustment signal and drives the mounting plate (2) and the laser (7) to move in a direction close to or away from the base (1); The signal output end of the signal processor is signal-connected to the signal input end of the servo motor (5), and the servo motor (5) receives the driving revolution signal and rotates.

2. A laser-assisted fixture according to claim 1, characterized in that: The driving component comprises a telescopic cylinder (6), a cylinder body of the telescopic cylinder (6) being fixedly connected to the base (1), and a cylinder shaft of the telescopic cylinder (6) being fixedly connected to the bottom of the mounting plate (2).

3. A laser-assisted fixture according to claim 2, characterized in that: The signal processor includes a single chip microcomputer.

4. The laser-assisted fixture according to claim 1, characterized in that: The mounting bracket (4) comprises a bottom plate (41), and two positioning plates (42) are adjustably arranged on the bottom plate (41), and the two positioning plates (42) are arranged opposite to each other; Positioning half rings (43) are detachably and fixedly connected to opposite side walls of the two positioning plates (42), and any two opposite positioning half rings (43) are respectively clamped and fixed on two sides of the laser (7); The tops of the two positioning plates (42) are respectively fixedly connected with locking plates (44), and any two opposite locking plates (44) are coaxially provided with locking holes (441).

5. A laser-assisted fixture according to claim 4, characterized in that: An elastic rubber pad (45) is fixedly connected to a side of the positioning half ring (43) away from the positioning plate (42).

6. A laser-assisted fixture according to claim 5, characterized in that: An installation cavity (411) is provided in the bottom plate (41), a cover plate (46) is detachably fixedly connected to the bottom plate (41), and the cover plate (46) covers the top of the installation cavity (411); Two racks (47) are slidably connected in the installation cavity (411), the ends of the two racks (47) extend upward and are integrally formed with extension parts (421), the cover plate (46) is provided with sliding holes (461) for the two extension parts (421) to slide, and the two extension parts (421) respectively pass through the two sliding holes (461) and are respectively fixedly connected to the two positioning plates (42); A transmission gear (48) is rotatably connected to the inner bottom wall of the installation cavity (411), and the two racks (47) are respectively meshed with two sides of the transmission gear (48).

7. A laser-assisted fixture according to claim 6, characterized in that: A rotating shaft (412) is fixedly connected to the bottom inner wall of the installation cavity (411), the transmission gear (48) is coaxially sleeved on the rotating shaft (412), the top of the rotating shaft (412) is fixedly connected to an anti-slip plate (413), and the two racks (47) are located between the anti-slip plate (413) and the bottom inner wall of the installation cavity (411).

8. The laser-assisted fixture according to claim 7, characterized in that: The bottoms of the two racks (47) are integrally formed with a limiting portion (471), and the bottom inner wall of the installation cavity (411) is respectively provided with two limiting grooves (414) adapted to the limiting portion (471), and the two limiting grooves (414) are respectively located on both sides of the rotating shaft (412), and the two limiting portions (471) are respectively embedded in the two limiting grooves (414).

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