A screw vibration feed mechanism

Abstract

The utility model provides a screw vibration feeding mechanism relates to screw production technical field, including screw material tray for storing screw, vibrator is fixedly arranged on the outer surface of screw material tray for vibrating screw material tray, feeding mechanism is arranged inside screw material tray, including lifting structure, rotating structure, screw storage structure and quick detach structure, lifting structure is fixedly arranged on the support surface, and is located the bottom of screw material tray, rotating structure is fixedly arranged on the top of lifting structure, screw storage structure sets up at rotating structure, through setting up quick detach structure, utilizes the elastic joint cooperation (joint column can form fixedness through spring and is bounced into joint hole, and through the realization quick separation of quick -witted block in the sliding groove slides) of joint column and joint hole, compared with the mode of fixing umbrella -shaped feeder through nut in prior art, need not tool can complete the replacement of screw storage structure.

Description

Technical Field

[0001] This utility model relates to the field of screw manufacturing technology, and in particular to a screw vibration feeding mechanism. Background Technology

[0002] Screw vibration feeding mechanisms are key equipment in automated assembly lines. They use vibration and mechanical transmission to organize disordered screws into an ordered state and feed them precisely, significantly improving assembly efficiency and reducing manual intervention. They are widely used in electronics, machinery, railways, and other fields. The core requirements for these mechanisms are feeding stability, compatibility with screws of different specifications, and ease of structural maintenance. Their performance directly affects the operating efficiency of the entire production line.

[0003] Chinese utility model patent with announcement number CN210209291U discloses a novel umbrella-shaped screw feeding mechanism. The mechanism includes an umbrella-shaped feeder, a material tray, a connecting rod, a rotator, a lifting component, a vibrator, and a support frame. Screw feeding is achieved by rotating the umbrella-shaped feeder in conjunction with vibrating the material tray. The umbrella-shaped feeder is fixed to the connecting rod by a nut, and the lifting component is raised and lowered by a cylinder.

[0004] However, this existing technology still has the following shortcomings:

[0005] The umbrella-shaped feeder is fixed to the connecting rod by a nut. When changing feeders with different apertures, the nut needs to be removed, which is cumbersome and time-consuming. It is difficult to adapt to the needs of frequent screw specification changes in the production line. In addition, the rotating structure is only connected to the rotator through the connecting rod, lacking stable support components. Long-term use may cause the connection to loosen due to vibration, affecting the stability of feeding.

[0006] Therefore, we propose a screw vibration feeding mechanism. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies. The umbrella-shaped feeder is fixed to the connecting rod by a nut. When changing feeders with different apertures, the nut needs to be removed, which is cumbersome and time-consuming. It is difficult to adapt to the needs of frequent screw specification changes in the production line. Furthermore, the rotating structure is only connected to the rotator through the connecting rod, lacking stable support components. Long-term use may cause the connection to loosen due to vibration, affecting the stability of the feeding.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A screw vibration feeding mechanism includes: a screw tray for storing screws; a vibrator fixedly mounted on the outer surface of the screw tray for vibrating the screw tray; and a feeding mechanism disposed inside the screw tray, including a lifting structure, a rotating structure, a screw storage structure, and a quick-release structure. The lifting structure is fixedly mounted on a support surface and located at the bottom of the screw tray. The rotating structure is fixedly mounted on the top of the lifting structure. The screw storage structure is disposed at the rotating structure and is used to rotate with the rotating structure. The quick-release structure is disposed inside the rotating structure and is used to connect with the screw storage structure to achieve quick replacement of screw storage structures with different hole spacings.

[0010] Several support feet are fixedly installed at the bottom of the screw tray to support the screw tray; a support connecting frame is fixedly installed between the lifting structure and the several support feet to assist in fixing the feeding mechanism.

[0011] As a preferred embodiment of this utility model, the lifting structure includes: an electric push rod, fixedly mounted on the support surface; an output shaft, fixedly mounted on the output shaft of the electric push rod; and a mounting plate, fixedly mounted on the top of the output shaft, for mounting the rotating structure.

[0012] As a preferred embodiment of this utility model, the rotating structure includes: a plurality of fixed brackets, fixedly disposed on the top of the mounting plate and located on the outer side; a support base, fixedly disposed between the plurality of fixed brackets; a bearing, disposed inside the support base; a rotating rod, disposed inside the bearing; and a servo motor, fixedly disposed at the center of the top of the mounting plate, with its output end connected to the bottom of the rotating rod.

[0013] As a preferred embodiment of this utility model, the screw storage structure includes: an umbrella-shaped feeder with several holes on its outer surface for hanging and storing screws; a snap-fit ​​sleeve fixedly disposed on the top of the umbrella-shaped feeder and having a groove inside; and two snap-fit ​​holes on the outer wall of the snap-fit ​​sleeve for connecting with a quick-release structure.

[0014] As a preferred embodiment of this utility model, the quick-release structure includes: two sliding grooves, formed on both sides inside the umbrella-shaped feeder; a partition plate, fixedly disposed between the two sliding grooves; a plurality of sliding grooves, each formed on the inner wall of the two mounting grooves; a plurality of sliding blocks, each slidably mounted inside the plurality of sliding grooves; two mounting plates, fixedly disposed between the plurality of sliding blocks; two springs, fixedly disposed on both side walls of the partition plate; and two snap-fit ​​posts, each fixedly disposed at the connection point of the two springs.

[0015] As a preferred embodiment of this utility model, the electric push rod is used to drive the output shaft to perform lifting and lowering operations, thereby driving the rotating structure, screw storage structure and quick-release structure to lift and lower synchronously; the servo motor is used to drive the rotating rod to rotate, and the bearing rotates synchronously when the rotating rod rotates.

[0016] As a preferred embodiment of this utility model, the snap-fit ​​post can slide on the sliding block via the mounting plate and compress the spring; the snap-fit ​​post can be springed into the snap-fit ​​hole to form a snap-fit.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In this invention, by setting a quick-release structure, the elastic engagement of the snap-fit ​​post and the snap-fit ​​hole (the snap-fit ​​post can be fixed by spring-springing into the snap-fit ​​hole, and quick separation is achieved by sliding the sliding block in the sliding groove) is used. Compared with the prior art of fixing the umbrella-shaped feeder with nuts, the screw storage structure can be replaced without tools, which greatly shortens the replacement time of screw storage structures with different hole spacing specifications, better adapts to the needs of frequent screw specification changes in the production line, and improves the flexibility of the equipment.

[0019] The rotating structure supports the rotating rod through several fixed frames, support seats, and bearings (the fixed frames are fixed to the top of the mounting plate, the support seats are connected to the fixed frames, and the bearings are embedded in the support seats and rotate with the rotating rod). Compared with the existing technology, which only connects the rotator through a connecting rod, the multi-point support design enhances the structural rigidity during rotation, reduces the problem of loosening of connections caused by long-term vibration, and improves the stability of the feeding process.

[0020] By setting up a support connecting frame to connect the lifting structure and the support feet, an auxiliary fixation is formed for the feeding mechanism. Together with the support feet supporting the screw tray, the entire mechanism is subjected to more uniform force during vibration and rotation, which further reduces the risk of structural loosening and improves the long-term reliability of the equipment. Attached Figure Description

[0021] Figure 1 A schematic diagram of the main structure of a screw vibration feeding mechanism provided by this utility model;

[0022] Figure 2 A schematic cross-sectional view of the main body of a screw vibration feeding mechanism provided by this utility model;

[0023] Figure 3 A schematic diagram of the main body of the feeding mechanism of a screw vibration feeding mechanism provided by this utility model;

[0024] Figure 4 A schematic diagram of the feeding mechanism of a screw vibration feeding mechanism provided by this utility model;

[0025] Figure 5 A schematic diagram of a quick-release structure for a screw vibration feeding mechanism provided by this utility model.

[0026] Legend: 10. Screw tray; 20. Vibrator; 30. Feeding mechanism; 301. Electric push rod; 302. Output shaft; 303. Mounting plate; 304. Fixing frame; 305. Support base; 306. Bearing; 307. Rotating rod; 308. Servo motor; 309. Umbrella feeder; 310. Snap-fit ​​sleeve; 311. Snap-fit ​​hole; 312. Mounting groove; 313. Divider plate; 314. Sliding groove; 315. Sliding block; 316. Mounting plate; 317. Spring; 318. Snap-fit ​​post; 40. Support foot; 50. Support connecting frame. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example

[0032] like Figure 1-5 As shown, this utility model provides a technical solution: a screw vibration feeding mechanism, including: a screw tray 10 for storing screws;

[0033] Vibrator 20 is fixedly mounted on the outer surface of screw tray 10 and is used to vibrate screw tray 10;

[0034] The feeding mechanism 30 is located inside the screw tray 10 and includes a lifting structure, a rotating structure, a screw storage structure and a quick-release structure. The lifting structure is fixedly mounted on the support surface and located at the bottom of the screw tray 10. The rotating structure is fixedly mounted on the top of the lifting structure. The screw storage structure is located at the rotating structure and is used to rotate with the rotating structure. The quick-release structure is located inside the rotating structure and is used to connect with the screw storage structure to realize quick replacement of screw storage structures with different hole spacings.

[0035] Several support feet 40 are fixedly installed at the bottom of the screw tray 10 to support the screw tray 10.

[0036] The support connecting frame 50 is fixedly installed between the lifting structure and several support feet 40 to assist in fixing the feeding mechanism 30.

[0037] The screw tray 10 stores screws to be fed. When the vibrator 20 works, it drives the screw tray 10 to vibrate, keeping the screws inside in a movable state to avoid accumulation. In the feeding mechanism 30, the lifting structure can drive the rotating structure, the screw storage structure, and the quick-release structure to lift as a whole, realizing the contact or separation of the screw storage structure from the screws in the screw tray 10. The rotating structure drives the screw storage structure to rotate, and in conjunction with the vibration, it makes the screws enter a specific position in the screw storage structure. The quick-release structure can quickly connect or separate screw storage structures with different hole spacings to accommodate screws of different specifications. The support foot 40 provides stable support for the screw tray 10, and the support connecting frame 50 further fixes the lifting structure to ensure that the overall mechanism remains stable during vibration and rotation.

[0038] The lifting structure includes:

[0039] Electric push rod 301 is fixedly mounted on the support surface;

[0040] The output shaft 302 is fixedly mounted on the output shaft 302 of the electric push rod 301;

[0041] Mounting plate 303 is fixedly mounted on top of output shaft 302 and is used to mount rotating structure.

[0042] The electric push rod 301 is fixed on the support surface to provide power. When the electric push rod 301 is started, its output end drives the output shaft 302 to extend and retract in the vertical direction. The mounting plate 303 on the top of the output shaft 302 rises and falls synchronously with the output shaft 302, thereby driving the rotating structure mounted on the mounting plate 303, as well as the screw storage structure and quick-release structure connected to the rotating structure to rise and fall together, so as to realize the height adjustment of the screw storage structure in the screw tray 10, and meet the needs of lifting when picking up materials or lowering when feeding materials.

[0043] The rotating structure includes:

[0044] Several mounting brackets 304 are fixedly mounted on the top of the mounting plate 303 and located on the outer side;

[0045] The support base 305 is fixedly installed among several fixed brackets 304;

[0046] Bearing 306 is disposed inside support 305;

[0047] The rotating rod 307 is located inside the bearing 306;

[0048] The servo motor 308 is fixedly mounted at the center of the top of the mounting plate 303, and its output end is connected to the bottom of the rotating rod 307.

[0049] Several fixed brackets 304 form a stable support on the top outer side of the mounting plate 303, and the support base 305 is fixed between the fixed brackets 304 to ensure stable position; the bearing 306 is embedded in the support base 305, and the rotating rod 307 passes through the bearing 306. The bearing 306 can reduce the frictional resistance when the rotating rod 307 rotates; the servo motor 308 is fixed at the center of the mounting plate 303, and its output end directly drives the rotating rod 307 to rotate. With the assistance of the bearing 306, the rotating rod 307 can smoothly and efficiently drive the screw storage structure connected at the top to rotate synchronously, so that the screw storage structure can fully contact the vibrating screws during rotation, making it easy for the screws to enter the preset position.

[0050] The screw storage structure includes:

[0051] The umbrella-shaped feeder 309 has several holes on its outer surface for hanging and storing screws.

[0052] The snap-fit ​​sleeve 310 is fixedly installed on the top of the umbrella-shaped feeder 309, and has a slot inside;

[0053] Two snap-fit ​​holes 311 are provided on the outer wall of the snap-fit ​​sleeve 310 for connection with the quick-release structure.

[0054] When the umbrella-shaped feeder 309 rotates with the rotating structure, the screws in the screw tray 10 move towards the umbrella-shaped feeder 309 under the vibration of the screw tray 10. When the screw shank is aligned with the hole on the outer surface of the umbrella-shaped feeder 309, the screw passes through the hole under the action of gravity and vibration, and the head is stuck at the edge of the hole to form a suspended storage. The snap-fit ​​sleeve 310 achieves preliminary positioning by cooperating with the corresponding part of the rotating structure through the internal slot. The two snap-fit ​​holes 311 on its outer wall cooperate with the snap-fit ​​part of the quick-release structure to achieve a stable connection between the umbrella-shaped feeder 309 and the rotating structure, ensuring that the umbrella-shaped feeder 309 rotates synchronously with the rotating structure.

[0055] The quick-release structure includes:

[0056] Two sliding grooves 314 are formed inside the umbrella-shaped feeder 309 on both sides;

[0057] The partition plate 313 is fixedly disposed between the two sliding grooves 314;

[0058] Several sliding grooves 314 are formed on the inner walls of the two mounting grooves 312;

[0059] Several sliding blocks 315 are slidably installed inside several sliding grooves 314;

[0060] Two mounting plates 316 are fixedly disposed between several sliding blocks 315;

[0061] Two springs 317 are fixedly installed on the two side walls of the partition plate 313;

[0062] Both snap-fit ​​posts 318 are fixedly installed at the connection of the two springs 317.

[0063] When the umbrella feeder 309 needs to be replaced, press the two locking pins 318 inward. The locking pins 318 push the mounting plate 316, and the mounting plate 316 drives several sliding blocks 315 to move horizontally towards the partition plate 313 in the sliding groove 314. At the same time, it squeezes the spring 317 connected between the partition plate 313 and the mounting plate 316, causing the locking pins 318 to exit from the locking holes 311 of the locking sleeve 310. At this time, the old umbrella feeder 309 can be removed. When installing the new umbrella feeder 309, the slot of the locking sleeve 310 is positioned in conjunction with the corresponding part of the rotating structure. Release the locking pins 318, and the spring 317 pushes the mounting plate 316 and the sliding blocks 315 to move in the opposite direction under the action of elasticity. This causes the locking pins 318 to extend and lock into the locking holes 311 of the locking sleeve 310, realizing the quick fixation of the umbrella feeder 309. The whole process does not require tools and is easy to operate.

[0064] The electric push rod 301 is used to drive the output shaft 302 to perform lifting and lowering operations, thereby driving the rotating structure, screw storage structure and quick-release structure to lift and lower synchronously.

[0065] The servo motor 308 is used to drive the rotating rod 307 to rotate, and the bearing 306 rotates synchronously when the rotating rod 307 rotates.

[0066] The electric actuator 301 drives the output shaft 302 to extend and retract axially via an internal motor. The lifting and lowering of the output shaft 302 is directly transmitted to the mounting plate 303. The rotating structure on the mounting plate 303 (including the fixing frame 304, support base 305, bearing 306, rotating rod 307, and servo motor 308) rises and falls with the mounting plate 303. At the same time, the screw storage structure and quick-release structure connected to the rotating rod 307 also rise and fall synchronously, thereby adjusting the relative position of the screw storage structure and the screws in the screw tray 10. When the servo motor 308 is working, the torque at its output end is transmitted to the rotating rod 307, causing the rotating rod 307 to rotate around its own axis. Since the rotating rod 307 passes through the bearing 306, the inner ring of the bearing 306 rotates synchronously with the rotating rod 307, and the outer ring is fixed in the support base 305. The rolling friction of the bearing 306 replaces the sliding friction, reducing the resistance and wear of the rotating rod 307 during rotation, ensuring a smooth and efficient rotation process.

[0067] The snap-fit ​​post 318 can slide on the sliding block 315 via the mounting plate 316 and compress the spring 317;

[0068] The snap-fit ​​post 318 can be springed into the snap-fit ​​hole 311 by the spring 317 to form a snap-fit.

[0069] When an external force is applied to the locking post 318, the locking post 318 pushes the mounting plate 316. The mounting plate 316 slides horizontally through the cooperation of several sliding blocks 315 and sliding grooves 314. At this time, the distance between the mounting plate 316 and the partition plate 313 is reduced, and the spring 317 is compressed and stores elastic potential energy. When the external force is removed, the spring 317 releases the elastic potential energy, pushes the mounting plate 316 to slide in the opposite direction, the sliding blocks 315 reset along the sliding grooves 314, and drive the locking post 318 to move away from the partition plate 313 until the locking post 318 springs into the locking hole 311 of the locking sleeve 310. A stable connection is formed through the mechanical cooperation between the locking post 318 and the locking hole 311, realizing the rapid assembly of the screw storage structure and the rotating structure. The connection strength can meet the force requirements during rotation and vibration.

[0070] Workflow

[0071] Initial preparation: Place the screws to be fed into the screw tray 10. The support foot 40 provides stable support to the tray. The support connecting frame 50 fixes the lifting structure and the support foot 40 to ensure the stability of the overall mechanism. At this time, the lifting structure is in the lowering state, and the umbrella-shaped feeder 309 is located inside the screw tray 10. The snap-fit ​​post 318 of the quick-release structure is snapped into the snap-fit ​​hole 311 of the snap-fit ​​sleeve 310, so that the umbrella-shaped feeder 309 is stably connected to the rotating structure.

[0072] Vibration and Rotation Feeding: Start the vibrator 20 to drive the screw tray 10 to vibrate, so that the internal screws are in a movable state to avoid accumulation; at the same time, start the servo motor 308 of the rotating structure. The servo motor 308 drives the rotating rod 307 (to rotate smoothly with the assistance of the bearing 306), which drives the umbrella-shaped feeder 309 to rotate synchronously; the rotating umbrella-shaped feeder 309, in conjunction with the vibration of the tray, causes the screws to move toward the umbrella-shaped feeder 309. The screw shank passes through the hole of the umbrella-shaped feeder 309, and the head is stuck at the edge of the hole to form a suspended storage.

[0073] Lifting and picking up materials: When enough screws are suspended on the umbrella-shaped feeder 309, the electric push rod 301 of the lifting structure is activated, driving the output shaft 302, the mounting plate 303 and the rotating structure above, the umbrella-shaped feeder 309, etc. to rise synchronously, so that the umbrella-shaped feeder 309 is detached from the screw tray 10 to avoid interference from the tray when picking up materials; after the robot arm takes the screws off the umbrella-shaped feeder 309, the electric push rod 301 drives the output shaft 302 to descend, driving all structures to reset, and the umbrella-shaped feeder 309 returns to the tray to continue feeding materials.

[0074] Replacement Specifications (as needed): If it is necessary to replace the umbrella feeder 309 with one that is compatible with screws of different specifications, press the snap-fit ​​post 318 of the quick-release structure inward. The snap-fit ​​post 318 will compress the spring 317 and move along the sliding groove 314 with the mounting plate 316 and the sliding block 315, and exit from the snap-fit ​​hole 311. Remove the old umbrella feeder 309, position the slot of the snap-fit ​​sleeve 310 of the new umbrella feeder 309 with the corresponding part of the rotating structure, release the snap-fit ​​post 318, and the spring 317 will push the snap-fit ​​post 318 back to its original position and snap into the snap-fit ​​hole 311 of the new snap-fit ​​sleeve 310. After the replacement is completed, repeat the above feeding process.

[0075] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw vibration feeding mechanism, characterized in that, include: Screw tray (10) for storing screws; A vibrator (20) is fixedly mounted on the outer surface of the screw tray (10) for vibrating the screw tray (10); The feeding mechanism (30) is set inside the screw tray (10) and includes a lifting structure, a rotating structure, a screw storage structure and a quick-release structure. The lifting structure is fixedly set on the support surface and located at the bottom of the screw tray (10). The rotating structure is fixedly set on the top of the lifting structure. The screw storage structure is set at the rotating structure and is used to rotate with the rotating structure. The quick-release structure is set inside the rotating structure and is used to connect with the screw storage structure to realize quick replacement of screw storage structures with different hole spacings. Several support feet (40) are fixedly installed at the bottom of the screw tray (10) to support the screw tray (10); A support connecting frame (50) is fixedly installed between the lifting structure and several support feet (40) to assist in fixing the feeding mechanism (30).

2. The screw vibration feeding mechanism according to claim 1, characterized in that, The lifting structure includes: An electric actuator (301) is fixedly mounted on the support surface; The output shaft (302) is fixedly mounted on the output shaft (302) of the electric push rod (301); The mounting plate (303) is fixedly mounted on the top of the output shaft (302) for mounting the rotating structure.

3. The screw vibration feeding mechanism according to claim 2, characterized in that, The rotating structure includes: Several fixing brackets (304) are fixedly installed on the top of the mounting plate (303) and located on the outer side; The support base (305) is fixedly disposed among several fixed brackets (304); The bearing (306) is disposed inside the support base (305); The rotating rod (307) is located inside the bearing (306); The servo motor (308) is fixedly mounted at the center of the top of the mounting plate (303), and its output end is connected to the bottom of the rotating rod (307).

4. The screw vibration feeding mechanism according to claim 3, characterized in that, The screw storage structure includes: An umbrella-shaped feeder (309) has several holes on its outer surface for hanging and storing screws. A snap-fit ​​sleeve (310) is fixedly installed on the top of the umbrella-shaped feeder (309) and has a slot inside; Two snap-fit ​​holes (311) are provided on the outer wall of the snap-fit ​​sleeve (310) for connection with the quick-release structure.

5. A screw vibration feeding mechanism according to claim 4, characterized in that, The quick-release structure includes: Two sliding grooves (314) are provided on both sides inside the umbrella-shaped feeder (309); A partition plate (313) is fixedly disposed between two sliding grooves (314); Several sliding grooves (314) are formed on the inner walls of the two mounting grooves (312); Several sliding blocks (315) are slidably installed inside several sliding grooves (314).

6. A screw vibration feeding mechanism according to claim 5, characterized in that, Quick-release structure includes Two mounting plates (316) are fixedly disposed between several sliding blocks (315); Two springs (317) are fixedly mounted on the two side walls of the partition plate (313); Both snap-fit ​​pins (318) are fixedly installed at the connection of the two springs (317).

7. A screw vibration feeding mechanism according to claim 6, characterized in that, The electric push rod (301) is used to drive the output shaft (302) to perform lifting and lowering operations, thereby driving the rotating structure, screw storage structure and quick-release structure to lift and lower synchronously; The servo motor (308) is used to drive the rotating rod (307) to rotate, and the bearing (306) rotates synchronously when the rotating rod (307) rotates.

8. A screw vibration feeding mechanism according to claim 7, characterized in that, The snap-fit ​​post (318) can slide on the sliding block (315) via the mounting plate (316) and compress the spring (317); The snap-fit ​​post (318) can be springed into the snap-fit ​​hole (311) by a spring (317) to form a snap-fit.

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