An automatic installation production line for trim fasteners

Abstract

The present invention relates to the technical field of trim panel fastener installation, and discloses an automatic trim panel fastener installation production line, comprising: at least one fastener loading platform, the fastener loading platform comprising a frame, a support plate disposed on top of the frame, the support plate having through holes, each of which contains a fastener storage assembly; a plurality of trim panel positioning assemblies; and an automatic riveting mechanism, the automatic riveting mechanism including a plurality of automatic riveters corresponding to each through hole in a row on the support plate; the fastener loading platform is provided with the fastener loading mechanism. The present invention automatically loads fasteners and automatically rivets the fasteners to the trim panel, resulting in high fastener installation efficiency and a low risk of missing fasteners.

Description

Technical Field

[0001] The present invention relates to the technical field of trim panel fastener installation, and in particular to an automatic trim panel fastener installation production line. Background Art

[0002] Architectural panels are widely used in the construction field for decorating building facades and improving the overall decorativeness and thermal insulation of the building. Architectural panels are typically installed using fasteners (or snap-in sockets, connectors) to connect to the keel. For example, the applicant's patent number is 2019205643373, entitled "An Exterior Wall Panel Assembly Structure." This patent discloses a connection structure between the panel body and the snap-in socket via bolts or rivets. The fastener structure in this application is identical or equivalent to the snap-in socket in this patent. Typically, a panel requires more than a dozen or even dozens of fasteners to be installed and riveted to the panel. Currently, these fasteners are manually placed and then riveted together. Manual placement of fasteners is very inefficient and prone to missing components. Summary of the Invention

[0003] In order to solve the above problems in the prior art, the present invention provides an automatic installation production line for decorative panel fasteners. The production line can automatically load fasteners and automatically rivet the fasteners to the decorative panels. The fastener installation efficiency is high and it is not easy to miss the fasteners.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A production line for automatically installing decorative panel fasteners, comprising:

[0006] At least one fastener loading platform, the fastener loading platform comprising a frame, a support plate disposed on top of the frame, the support plate having through holes distributed in an array corresponding one-to-one to the connection holes on the decorative plate, each through hole having a fastener storage assembly disposed therein;

[0007] A plurality of trim panel positioning assemblies, arranged around the frame, for positioning the trim panels; and

[0008] An automatic riveting mechanism, the automatic riveting mechanism being connected to the frame via a guide bracket, the automatic riveting mechanism being configured to move horizontally along the guide bracket, the automatic riveting mechanism being provided with a plurality of automatic riveters corresponding to each through hole in the same row of the support plate;

[0009] Among them, the fastener loading platform is provided with a fastener loading mechanism which lifts the top fastener in each fastener storage assembly upward by a predetermined distance; after the decorative panel is placed on the support plate and positioned by the decorative panel positioning assembly, the fastener loading mechanism lifts the top fastener in the fastener storage assembly so that the fastener fits with the bottom surface of the decorative panel, and the automatic riveting mechanism moves along the guide bracket to the top of each row of through holes, and the automatic riveter rivets the corresponding connecting holes and fasteners in turn.

[0010] A number of fasteners are loaded into each fastener storage assembly. The trim is transferred to the support plate of the fastener loading platform manually or by a mechanical suction cup. The trim is positioned by the trim positioning assembly so that the connection holes on the trim are aligned one by one with the through holes on the support plate. The automatic riveting mechanism moves to the top of a row of connection holes, and the automatic riveter rivets the fasteners to the connection holes together. This process continues until all the fasteners are riveted to the connection holes. After that, the automatic riveting mechanism resets to its initial position, and the trim with the fasteners installed is removed manually or by a mechanical suction cup. After the next trim is loaded and positioned, the fastener loading mechanism lifts the top fastener so that the fastener fits the trim, and then the automatic riveter rivets it. When all the fasteners in the fastener storage assembly are used up, they are reloaded for use. This production line can quickly connect fasteners to trims, saving a lot of time in placing fasteners, greatly improving fastener installation efficiency, and effectively preventing missing fasteners.

[0011] Preferably, the automatic riveting mechanism includes a base plate, the two ends of which are slidably connected to the guide bracket through sliders and slide rails; the base plate is provided with a displacement drive mechanism for driving the base plate to move along the guide bracket; a lifting plate is provided on the lower side of the base plate, and a lifting assembly is provided between the lifting plate and the base plate; the automatic riveter includes a rivet head and an automatic nail feeder connected to the rivet head through a hose, the rivet head is installed on the lifting plate, and the automatic nail feeder is installed on the base plate.

[0012] Preferably, the displacement drive mechanism includes a rack fixed on the guide bracket and a motor mounted on the base plate, and the shaft end of the motor is provided with a gear meshing with the rack; the two ends of the lifting plate are slidably connected to the base plate through a number of vertical guide rods, and the lifting assembly is configured as a lifting cylinder.

[0013] Preferably, a connecting tube is fixed to the top surface of the lifting plate, into which the shaft end of the lifting cylinder extends. The upper end of the connecting tube is provided with a constriction. A limit block is fixed to the shaft end of the lifting cylinder, and a compression spring is provided between the limit block and the bottom of the connecting tube. The lifting cylinder drives the lifting plate downward, allowing the rivet head to elastically abut against the decorative panel, preventing the rivet head from damaging the decorative panel.

[0014] Preferably, a connecting bracket is provided on the underside of the guide bracket, on which are mounted a number of sensing blocks, each corresponding to a row of through-holes on the support plate. Sensors corresponding to the sensing blocks are provided on the underside of the base plate. When the base plate moves until the sensor detects a signal from the sensing block, the base plate stops moving, and the lifting assembly drives the lifting plate downward, allowing the rivet head to descend to a position corresponding to a row of connection holes on the decorative plate and automatically rivet. The sensing blocks cooperate with the sensors to control the movement of the base.

[0015] Preferably, the trim panel positioning assembly includes a positioning cylinder and a positioning plate fixed to the end of the positioning cylinder shaft. The positioning plate is provided with first horizontal guide rods at both ends, which are slidably connected to the frame. A movable plate is provided on the inner side of the positioning plate, and its ends are slidably connected to the positioning plate via second horizontal guide rods. The positioning plate is also provided with an adjustment handle for adjusting the distance between the movable plate and the positioning plate. When the trim panel is placed on the fastener loading platform, all positioning cylinder shafts retract, allowing the movable plate to press against the edge of the trim panel for rapid positioning. The distance between the movable plate and the positioning plate can be adjusted as needed to ensure the trim panel's positioning accuracy.

[0016] Preferably, the fastener storage assembly includes a guide seat and a fastener seat slidably connected to the guide seat up and down, the upper end of the guide seat is fixedly connected to the bottom of the through hole on the support plate; the upper end of the fastener seat is open, and a fastener storage cavity with a rectangular cross-section is provided in the fastener seat, and a plurality of fasteners are stacked in the fastener storage cavity from top to bottom; a top rod is provided at the bottom of the guide seat, and a support block is provided at the upper end of the top rod for supporting the lowest fastener in the fastener storage cavity, and the fastener feeding mechanism drives the top rod to rise a certain distance each time, so that the top fastener in the fastener storage cavity rises a certain displacement and fits with the decorative panel.

[0017] Preferably, the fastener feeding mechanism includes a top plate located on the lower side of the fastener storage assembly and distributed parallel to the support plate, the bottom of the support plate is provided with a plurality of guide columns passing through the top plate and slidingly connected to the top plate, a motor is fixed to the middle part of the bottom surface of the support plate, a screw is provided on the shaft end of the motor, a screw sleeve is fixed to the top plate, the screw passes through the screw sleeve to form a threaded connection, and the lower end of the top rod abuts against the top plate.

[0018] Preferably, the guide seat has a side surface with an elongated slot, and the fastener seat has a side surface with a stop pin located within the elongated slot and slidable along the elongated slot. The fastener seat has a side surface with a guide groove that extends through the fastener storage cavity, and the upper end of the guide groove extends through the upper end of the fastener seat. When loading fasteners, the fastener seat is pulled out from the upper end of the guide seat, and then some fasteners are loaded into the fastener seat until the fastener storage cavity is full, and then the fastener seat is returned to the guide seat.

[0019] Preferably, the upper end of the fastener seat is provided with a lug on the outside, and avoidance grooves are provided on both sides of the through-hole in the support plate at locations corresponding to the lugs. The bottom of the guide seat is provided with a permanent magnet that magnetically connects to the fastener seat, and the upper end of the fastener seat is provided with a chamfered corner on the inside. The lug facilitates gripping and lifting the fastener seat with fingers. The chamfered corner ensures that even if the top fastener is connected to the trim panel and the trim panel tilts during removal (which would cause the fastener to tilt), the chamfered corner prevents interference between the fastener and the fastener seat.

[0020] Therefore, in the present invention, the fasteners are automatically installed and the riveting of the fasteners and the decorative panels is automatically achieved, so the fastener installation efficiency is high and it is not easy to miss the fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 for Figure 1 Front view of .

[0023] Figure 3 for Figure 1 Top view of .

[0024] Figure 4 Schematic diagram of the connection between the automatic riveting mechanism and the guide bracket.

[0025] Figure 5 for Figure 4 Another perspective of the picture.

[0026] Figure 6 This is a connection diagram of the lifting cylinder and lifting plate.

[0027] Figure 7 This is a structural diagram of the fastener loading platform.

[0028] Figure 8 This is a schematic diagram of the connection between the trim panel positioning assembly and the frame.

[0029] Figure 9 It is a connection diagram of the support plate and fastener storage assembly.

[0030] Figure 10 for Figure 9 A partial enlarged schematic diagram of point A in the middle.

[0031] Figure 11 This is a connection diagram of the fastener feeding mechanism and the fastener storage assembly.

[0032] Figure 12 It is a structural diagram of the fastener storage component.

[0033] Figure 13 for Figure 12 Exploded diagram.

[0034] Figure 14 for Figure 12 sectional view of .

[0035] Figure 15 Schematic diagram of the fastener seat being pulled upwards and loaded with fasteners.

[0036] Figure 16 This is a schematic diagram of the trim panel being placed on the fastener loading platform. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0038] like Figures 1-11 The automatic installation production line of decorative panel fasteners shown in the figure comprises: at least one fastener loading platform 1, the fastener loading platform 1 comprising a frame 100, a support plate 101 provided on the top of the frame, the support plate 101 being provided with through holes 102 distributed in an array corresponding to the connection holes on the decorative panels, each through hole being provided with a fastener storage assembly 2; a plurality of decorative panel positioning assemblies 3 provided around the frame 100 for positioning the decorative panels; and an automatic riveting mechanism 4, the automatic riveting mechanism 4 being connected to the frame via a guide bracket 5, the automatic riveting mechanism 4 being configured to move horizontally along the guide bracket 5, the automatic riveting mechanism 4 being provided with a plurality of automatic rivets 40 corresponding to each through hole in the same row of the support plate; wherein the fastener loading platform 1 is provided with a fastener loading mechanism 6 for lifting the topmost fastener in each fastener storage assembly upward by a predetermined distance;

[0039] like Figure 16 As shown, after the trim panel 7 is placed on the support plate and positioned by the trim panel positioning assembly, the fastener loading mechanism lifts the top fastener in the fastener storage assembly so that the fastener fits with the bottom surface of the trim panel, and the automatic riveting mechanism moves along the guide bracket to the top of each row of through holes, and the automatic riveter rivets the corresponding connecting holes 70 with the fasteners in turn.

[0040] like Figure 7 and Figure 16 As shown, there are 32 connecting holes on the decorative panel 7 in this embodiment, which are distributed in a 4X8 array; 16 fastener storage components 2 are set on each fastener loading platform, which are distributed in a 4X4 array, so two groups of fastener loading platforms are set to meet the fastener requirements of all connecting holes on the decorative panel.

[0041] like Figure 4-Figure 6As shown, the automatic riveting mechanism 4 includes a base plate 41, the two ends of which are slidably connected to the guide bracket 5 through sliders 42 and slide rails 43; a displacement drive mechanism 44 is provided on the base plate 41 for driving the base plate to move along the guide bracket, and the displacement drive mechanism 44 includes a rack 440 fixed to the guide bracket and a motor 441 mounted on the base plate, and a gear 442 is provided at the shaft end of the motor to mesh with the rack;

[0042] A lifting plate 45 is provided on the lower side of the base plate 41. The two ends of the lifting plate are slidably connected to the base plate via a number of vertical guide rods. A lifting assembly 46 is provided between the lifting plate 45 and the base plate 41. The automatic riveter 40 includes a rivet head 400 and an automatic nail feeder 401 connected to the rivet head via a hose. The rivet head is mounted on the lifting plate, and the automatic nail feeder is mounted on the base plate. In this embodiment, there are four automatic rivet heads, corresponding to the four connection holes in the same row on the decorative panel. The lifting assembly 46 in this embodiment is configured as a lifting cylinder. A connecting tube 450 is fixed to the top surface of the lifting plate 45. The shaft end of the lifting cylinder extends into the connecting tube. The upper end of the connecting tube is provided with a constriction. A limit block 451 is fixed to the shaft end of the lifting cylinder. A compression spring 452 is provided between the limit block and the bottom of the connecting tube.

[0043] like Figure 5 As shown, a connecting bracket 50 is provided on the lower side of the guide bracket 5, and a plurality of sensing blocks 51 are provided on the connecting bracket. Each sensing block corresponds to a row of through holes on the support plate. In this embodiment, there are eight groups of sensing blocks, corresponding to the eight rows of through holes. A sensor 47 corresponding to the sensing block is provided on the lower side of the base plate 41. When the base plate moves to the point where the sensor detects a signal from the sensing block, the base plate stops moving, and the lifting assembly drives the lifting plate down, causing the rivet head to descend to the position corresponding to the row of connecting holes on the decorative plate and automatically rivet. The sensor 47 in this embodiment is either a proximity sensor or a laser beam sensor. In some embodiments, if the holes in two adjacent rows of the decorative plate are staggered, a slide that can be driven left and right by an electric cylinder or a pneumatic cylinder is provided on the lifting plate. The rivet head is mounted on the slide to achieve left and right adjustment of the rivet head, thereby achieving riveting of the staggered holes. Alternatively, a row of rivet pullers can be added to achieve riveting of such holes. In this way, there are two rows of staggered rivet pullers, with one row of rivet pullers working at a time.

[0044] like Figure 7 and Figure 8 As shown, the trim panel positioning assembly 3 includes a positioning cylinder 30 and a positioning plate 31 fixed to the shaft end of the positioning cylinder. Both ends of the positioning plate 31 are provided with a first horizontal guide rod 32 that is slidably connected to the frame; the inner side of the positioning plate is provided with a movable plate 33, and both ends of the movable plate 33 are slidably connected to the positioning plate 31 through a second horizontal guide rod 34. The positioning plate is also provided with an adjustment handle 35 for adjusting the distance between the movable plate and the positioning plate. The adjustment handle 35 passes through the positioning plate and is threadedly connected to the positioning plate, and the front end of the adjustment handle is rotatably connected to the movable plate.

[0045] like Figure 11-Figure 15 As shown, the fastener storage assembly 2 includes a guide seat 20, a fastener seat 21 slidably connected to the guide seat, and the upper end of the guide seat is fixedly connected to the bottom of the through hole on the support plate; the upper end of the fastener seat is open, and the fastener seat 21 is provided with a fastener storage cavity with a rectangular cross-section, and a plurality of fasteners 22 are stacked in the fastener storage cavity from top to bottom; a top rod 23 is provided at the bottom of the guide seat 20, and a support block 24 is provided at the upper end of the top rod for supporting the lowest fastener in the fastener storage cavity. The fastener feeding mechanism drives the top rod to rise a certain distance each time, so that the uppermost fastener in the fastener storage cavity rises a certain displacement and fits with the decorative panel.

[0046] like Figure 11 As shown, the fastener feeding mechanism 6 includes a top plate 60 located on the lower side of the fastener storage assembly and distributed parallel to the support plate. The bottom of the support plate is provided with a plurality of guide columns 61 that pass through the top plate and are slidably connected to the top plate. A motor 62 is fixed to the middle part of the bottom surface of the support plate, and a screw rod 63 is provided at the shaft end of the motor. A screw sleeve 64 is fixed on the top plate, and the screw rod passes through the screw sleeve to form a threaded connection. The lower end of the top rod abuts against the top plate.

[0047] The side of the guide seat 20 is provided with an elongated slot 200, and the side of the fastener seat 21 is provided with a limit pin 210 located within the elongated slot and capable of sliding along the elongated slot. The side of the fastener seat 21 is provided with a guide groove 211 that extends through the fastener storage cavity, and the upper end of the guide groove extends through the upper end of the fastener seat. The upper end of the fastener seat 21 is provided with a lug 212 on the outer side, and avoidance grooves 1020 are provided on both sides of the through hole 102 on the support plate 101 corresponding to the lug. The bottom of the guide seat 20 is provided with a permanent magnet 25 that is magnetically connected to the fastener seat, and the upper end of the fastener seat 21 is provided with a chamfer 213 on the inner side.

[0048] Combined with the accompanying drawings, the principle of the present invention is as follows: each fastener storage assembly is filled with fasteners. The fastener thickness in this embodiment is 6mm, and the depth of the fastener storage cavity is 600mm, that is, each fastener seat can be loaded with 100 fasteners, and all fastener seats are filled with 100 fasteners, that is, when 100 decorative panels are installed, fasteners need to be filled once; the fastener filling state is as follows: Figure 15As shown, the fastener seat is pulled out upward, and after the fastener seat is filled with fasteners, the fastener seat is installed back into the guide seat; the decorative panel is transferred to the support plate of the fastener loading platform by the mechanical suction cup, and the decorative panel is positioned by the decorative panel positioning assembly so that the connection holes on the decorative panel are aligned one by one with the through holes on the support plate; the automatic riveting mechanism moves to the top of a row of connection holes, and the lifting plate drives the riveting head to descend, thereby riveting the four connection holes 70 in a row of the decorative panel to the four fasteners; then the lifting plate rises and resets, and then moves to the next row of connection holes, and moves in sequence to rivet all the fasteners to the connection holes; then the automatic riveting mechanism resets to the initial position, and the decorative panel with the fasteners installed is removed by the mechanical suction cup, and then the next decorative panel is installed and positioned, and the motor drives the top plate to rise by a fastener distance, and the top rod lifts all the fasteners in the fastener seat by a fastener distance, so that the fasteners and the decorative panel are fitted, and then the fasteners are riveted by the automatic riveter; when the fasteners in the fastener storage assembly are used up, they are filled with fasteners again for use. This production line can quickly connect fasteners and trim panels, saving a lot of time in placing fasteners, greatly improving fastener installation efficiency, and effectively preventing fasteners from being missed.

[0049] In the description of the present invention, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0050] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all included in the scope of protection of the present invention.

Claims

1. A production line for automatic installation of decorative panel fasteners, characterized in that: include: At least one fastener loading platform, the fastener loading platform comprising a frame, a support plate disposed on top of the frame, the support plate having through holes distributed in an array corresponding one-to-one to the connection holes on the decorative plate, each through hole having a fastener storage assembly disposed therein; A plurality of trim panel positioning assemblies, arranged around the frame, for positioning the trim panels; and An automatic riveting mechanism, the automatic riveting mechanism being connected to the frame via a guide bracket, the automatic riveting mechanism being configured to move horizontally along the guide bracket, the automatic riveting mechanism being provided with a plurality of automatic riveters corresponding to each through hole in the same row of the support plate; The fastener feeding platform is provided with a fastener feeding mechanism for lifting the top fastener in each fastener storage assembly upward by a predetermined distance; after the decorative panel is placed on the support plate and positioned by the decorative panel positioning assembly, the fastener feeding mechanism lifts the top fastener in the fastener storage assembly so that the fastener fits the bottom surface of the decorative panel, and the automatic riveting mechanism moves along the guide bracket to the top of each row of through holes, and the automatic riveter rivets the corresponding connecting holes with the fasteners in turn; The automatic riveting mechanism includes a base plate, both ends of which are slidably connected to the guide bracket via sliders and slide rails; a displacement driving mechanism is provided on the base plate for driving the base plate to move along the guide bracket; a lifting plate is provided on the lower side of the base plate, and a lifting assembly is provided between the lifting plate and the base plate; the automatic riveter includes a rivet head and an automatic nail feeder connected to the rivet head via a hose, the rivet head is mounted on the lifting plate, and the automatic nail feeder is mounted on the base plate; The fastener storage assembly includes a guide seat and a fastener seat slidably connected to the guide seat up and down, the upper end of the guide seat is fixedly connected to the bottom of the through hole on the support plate; the upper end of the fastener seat is open, and a fastener storage cavity with a rectangular cross section is provided in the fastener seat, and a plurality of fasteners are stacked in the fastener storage cavity from top to bottom; a push rod is provided at the bottom of the guide seat, and a support block is provided at the upper end of the push rod for supporting the lowermost fastener in the fastener storage cavity. The fastener feeding mechanism drives the push rod to rise a certain distance each time, so that the uppermost fastener in the fastener storage cavity rises a certain displacement and fits into the decorative plate; The fastener feeding mechanism includes a top plate located on the lower side of the fastener storage assembly and distributed parallel to the support plate. The bottom of the support plate is provided with a plurality of guide columns that pass through the top plate and are slidably connected to the top plate. A motor is fixed to the middle part of the bottom surface of the support plate, and a screw is provided at the shaft end of the motor. A screw sleeve is fixed to the top plate, and the screw passes through the screw sleeve to form a threaded connection. The lower end of the top rod abuts against the top plate.

2. The automatic installation production line for decorative panel fasteners according to claim 1 is characterized in that: The displacement drive mechanism includes a rack fixed on the guide bracket and a motor installed on the base plate. The shaft end of the motor is provided with a gear meshing with the rack; the two ends of the lifting plate are slidably connected to the base plate through a number of vertical guide rods, and the lifting assembly is configured as a lifting cylinder.

3. The automatic installation production line for decorative panel fasteners according to claim 2, characterized in that: A connecting tube is fixed on the top surface of the lifting plate, the axial end of the lifting cylinder extends into the connecting tube, the upper end of the connecting tube is provided with a necking, the axial end of the lifting cylinder is fixed with a limiting block, and a compression spring is provided between the limiting block and the bottom of the connecting tube.

4. The automatic installation production line for decorative panel fasteners according to claim 1, 2 or 3, characterized in that: A connecting bracket is provided on the lower side of the guide bracket, and a plurality of sensing blocks are provided on the connecting bracket. Each sensing block corresponds to a row of through holes on the support plate. A sensor corresponding to the sensing block is provided on the lower side of the base plate. When the base plate moves until the sensor detects the signal of the sensing block, the base plate stops moving, and the lifting assembly drives the lifting plate to descend, so that the rivet head descends to the position corresponding to the row of connecting holes on the decorative plate and automatically rivets.

5. The automatic installation production line for decorative panel fasteners according to claim 1 is characterized in that: The trim panel positioning assembly includes a positioning cylinder and a positioning plate fixed to the end of the positioning cylinder shaft. Both ends of the positioning plate are provided with a first horizontal guide rod that is slidably connected to the frame; the inner side of the positioning plate is provided with a movable plate, and the two ends of the movable plate are slidably connected to the positioning plate through a second horizontal guide rod. The positioning plate is also provided with an adjustment handle for adjusting the distance between the movable plate and the positioning plate.

6. The automatic installation production line for decorative panel fasteners according to claim 5, characterized in that: The side of the guide seat is provided with a long slot hole, and the side of the fastener seat is provided with a limit pin located in the long slot hole and capable of sliding along the long slot hole; the side of the fastener seat is provided with a guide groove that passes through the fastener storage cavity, and the upper end of the guide groove passes through the upper end of the fastener seat.

7. The automatic installation production line for decorative panel fasteners according to claim 6, characterized in that: A lug is provided on the outer side of the upper end of the fastener seat, and avoidance grooves are provided on both sides of the through hole on the support plate corresponding to the lug; a permanent magnet magnetically connected to the fastener seat is provided at the bottom of the guide seat, and an oblique chamfer is provided on the inner side of the upper end of the fastener seat.

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