CN111376021A - Mechanism is pulled out to mainboard DRAM - Google Patents

Abstract

The invention discloses a mainboard memory bank removing mechanism, which comprises: a support; the mounting rack is arranged on the bracket in a liftable manner; the clamping assembly is arranged on the mounting frame and used for clamping the memory bank; the limiting piece is arranged on the clamping assembly and used for limiting the memory bank; the poking piece is rotatably arranged on the mounting frame and used for opening the clamping jaws of the main board slot; the first driving piece is arranged on the bracket, and the output end of the first driving piece is in transmission connection with the mounting frame; the second driving piece is arranged on the mounting frame, and the output end of the second driving piece is in transmission connection with the stirring piece; the pressing assembly is arranged on the mounting frame and used for pressing the main board. After the mounting bracket descends to preset position, compress tightly the mainboard through compressing tightly the subassembly, prevent that the mainboard from because of the inhomogeneous perk of atress or taking place the drunkenness at the in-process of pulling out the DRAM, be favorable to improving the stability and the reliability of DRAM removal process.

Description

Mechanism is pulled out to mainboard DRAM

Technical Field

The invention relates to the technical field of computer production, in particular to a mainboard memory bank removing mechanism.

Background

Among the prior art, mainboard DRAM pulling mechanism is at the in-process of pulling out the DRAM, because the mainboard is not placed levelly and smoothly or the atress is inhomogeneous, can lead to the mainboard perk, and simultaneously, the vibrations that the equipment during operation produced can drive the mainboard vibrations, leads to the mainboard to take place the drunkenness, and consequently the process of pulling out of DRAM is comparatively unstable, has the condition that DRAM or mainboard slot damaged, has brought the loss for the user.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a mainboard memory bank removing mechanism which can prevent a mainboard from tilting or moving.

According to the first aspect of the invention, the main board memory bank removing mechanism comprises: a support; the mounting rack is arranged on the bracket in a liftable manner; the clamping assembly is arranged on the mounting frame and is used for clamping the memory bank; the limiting piece is arranged on the clamping assembly and used for limiting the memory bank; the poking piece is rotatably arranged on the mounting rack and used for opening a clamping jaw of the main board slot; the first driving piece is arranged on the bracket, and the output end of the first driving piece is in transmission connection with the mounting rack; the second driving piece is arranged on the mounting frame, and the output end of the second driving piece is in transmission connection with the toggling piece; and the pressing assembly is arranged on the mounting frame and is used for pressing the main board.

The mainboard memory bank removing mechanism provided by the embodiment of the invention at least has the following beneficial effects: through first driving piece drive after the mounting bracket descends to preset position, second driving piece drive stir the jack catch that the piece rotated in order to open the mainboard slot, the DRAM upsets afterwards, and through locating part is spacing to the formation of the DRAM that upsets, at last through centre gripping subassembly centre gripping DRAM and through first driving piece drive the mounting bracket rises in order to accomplish the process of pulling out of DRAM. Wherein, after the mounting bracket descends to preset position, compress tightly the lower extreme butt of subassembly on the mainboard to compress tightly the mainboard, thereby prevent that the mainboard from because of the inhomogeneous perk of atress or taking place the drunkenness at the in-process of pulling out the DRAM, be favorable to improving the stability and the reliability of DRAM removal process, damage at the in-process of pulling out of DRAM or mainboard slot at the DRAM in order to avoid DRAM or mainboard slot, satisfied user's demand betterly.

According to some embodiments of the present invention, the pressing assembly includes a pressing member and a sleeve, the sleeve is disposed on the bracket, an upper end of the pressing member slidably penetrates through the sleeve, a step is disposed on an upper portion of the pressing member, an abutting portion is disposed at an upper end of the sleeve, a first pressing spring is sleeved on an upper end of the pressing member, one end of the first pressing spring abuts against the abutting portion, the other end of the first pressing spring abuts against the step, and a first limiting portion is disposed at a top of the pressing member. Through first roof pressure spring for when the mainboard was not placed levelly and smoothly, the piece that compresses tightly can the self-adaptation and provide stable packing force, has further improved the stability and the reliability of memory bank pull-out process.

According to some embodiments of the invention, the lower end of the pressing member is provided with a rubber pad to prevent the main board from being scratched by the pressing member.

According to some embodiments of the invention, the rubber pad is detachably connected to the lower end of the pressing member, so that the rubber pad can be replaced after being worn.

According to some embodiments of the invention, the first limiting part is detachably connected to the top of the compressing member, so that the compressing member can be conveniently mounted and dismounted, and the compressing member can be conveniently assembled and maintained.

According to some embodiments of the invention, the upper part and the lower part of the pressing piece are of a split structure, the lower part of the pressing piece is detachably connected to the upper part of the pressing piece, and the lower parts of the pressing pieces with different lengths can be replaced according to actual requirements, so that the adaptability of the pressing piece is improved.

According to some embodiments of the invention, the clamping assembly comprises:

the linear driving assembly is arranged on the mounting frame, and the limiting piece is arranged on the linear driving assembly;

the middle part of the clamping piece is hinged to the limiting piece, the upper end of the clamping piece is connected to the output end of the linear driving assembly, and a hook portion is arranged at the lower end of the clamping piece.

Through the cooperation between the breach of hook portion and DRAM lateral part, it is spacing to form in vertical direction to the DRAM, so that centre gripping subassembly centre gripping DRAM is pulled out, and sharp drive assembly can drive the holder rotates, makes the holder is opened or is drawn in the lateral part of DRAM, and its simple structure easily realizes, and the transmission is stable.

According to some embodiments of the present invention, the linear driving assembly includes a first cylinder, a connecting member is disposed on a cylinder of the first cylinder, an upper end of the connecting member slidably penetrates through the mounting frame, the upper end of the connecting member has a second limiting portion, a second pressing spring is sleeved on the connecting member, one end of the second pressing spring abuts against the mounting frame, and the other end of the second pressing spring abuts against the cylinder of the first cylinder. The second top pressure spring enables the clamping assembly to be in the process of removing the memory bank, the cylinder barrel of the first air cylinder can be self-adaptive to the phenomenon of unevenness of the mainboard caused by not placing the mainboard in place or shaking, and the stability and the reliability of the process of removing the memory bank are further improved.

According to some embodiments of the present invention, the limiting member is provided with a limiting groove corresponding to the memory bank, and the memory bank is limited in the horizontal direction, so as to improve the stability of the memory bank in the removing process.

According to some embodiments of the invention, the side wall of the limiting groove is provided with an inclined surface at the bottom opening of the limiting groove, so that the opening of the limiting groove is in a flaring structure, the limiting groove is convenient to be butted with the memory bank, and the inclined surface has a guiding function.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a motherboard slot and a memory bank with a latch of the motherboard slot in an open state;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a schematic structural diagram of a hold-down assembly in accordance with an embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5 at C;

FIG. 7 is an enlarged view of a portion of FIG. 4 at B;

FIG. 8 is an enlarged partial schematic view at D of FIG. 7;

FIG. 9 is a schematic structural diagram of a limiting element according to an embodiment of the invention;

FIG. 10 is an enlarged view of a portion of FIG. 9 at E;

FIG. 11 is a schematic view of a clamp according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a toggle member according to an embodiment of the present invention.

Reference numerals:

a support 10, a slide rail 11;

a mounting frame 20 and a sliding seat 21;

the clamping component 30, the clamping piece 31, the hook part 311, the first air cylinder 32 and the connecting piece 321;

a stopper 40, a stopper groove 41, an inclined surface 411, and a second position sensor 42;

the shifting piece 50, the extending part 51, the shifting rod 52, the shifting claw 53 and the avoiding opening 54;

a first driving member 60;

a second driver 70;

the pressing component 80, the pressing piece 81, the step 811, the first top pressure spring 812, the first limiting part 813, the rubber cushion 814, the sleeve 82, and the abutting part 821.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that if an orientation description is referred to, for example, the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if several, more than, less than, more than, above, below, or within words appear, several means are one or more, several means are two or more, more than, less than, more than, etc. are understood as not including the number, and more than, less than, within, etc. are understood as including the number.

In the description of the present invention, if the first, second, etc. terms appear, they are only used for distinguishing technical features, but are not to be interpreted as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 and 2, the main board slot a has a latch a1 thereon, and the side of the memory bank b has a notch b1 for catching the latch a 1.

Referring to fig. 3 and 4, the main board memory bank removing mechanism according to the embodiment of the invention includes a support 10, a mounting frame 20, a clamping assembly 30, a limiting member 40, a toggle member 50, a first driving member 60, a second driving member 70, and a pressing assembly 80.

The mounting bracket 20 is arranged on the support 10 in a liftable manner, the clamping assembly 30 is arranged on the mounting bracket 20 and is used for clamping the memory bank, the limiting member 40 is arranged on the clamping assembly 30 and is used for limiting the memory bank, the stirring member 50 is rotatably arranged on the mounting bracket 20 and is used for opening a clamping jaw of a main board slot, the first driving member 60 is arranged on the support 10, the output end of the first driving member 60 is in transmission connection with the mounting bracket 20 and is used for driving the mounting bracket 20 to ascend and descend, the second driving member 70 is arranged on the mounting bracket 20, the output end of the second driving member 70 is in transmission connection with the stirring member 50 and is used for driving the stirring member 50 to rotate, the pressing assembly 80 is arranged on the mounting bracket 20.

After the first driving member 60 drives the mounting frame 20 to descend to the preset position, the second driving member 70 drives the toggle member 50 to rotate so as to open the claw of the motherboard slot, then the memory bank pops up, the popped memory bank is limited by the limiting member 40, and finally the memory bank is clamped by the clamping assembly 30 and the mounting frame 20 is driven to ascend by the first driving member 60 so as to complete the memory bank unplugging process. Wherein, after mounting bracket 20 descends to preset position, compress tightly the lower extreme butt of subassembly 80 on the mainboard to compress tightly the mainboard, thereby prevent that the mainboard from because of the inhomogeneous perk of atress or taking place the drunkenness at the in-process of pulling out the DRAM, be favorable to improving the stability and the reliability of DRAM pulling out the process, damage at the in-process of pulling out of DRAM or mainboard slot, user's demand has been satisfied betterly.

It should be noted that in some embodiments, the pressing member 80 is in point contact with the main board, so that there are at least three pressing members 80, but of course, the point contact may be replaced by a surface contact, and at least one pressing member 80 is only needed.

Referring to fig. 5 and 6, in some embodiments, the pressing assembly 80 includes a pressing member 81 and a sleeve 82, the sleeve 82 is disposed on the bracket 10, an upper end of the pressing member 81 slidably penetrates through the sleeve 82, a step 811 is disposed on an upper portion of the pressing member 81, an abutting portion 821 is disposed on an upper end of the sleeve 82, a first pressing spring 812 is sleeved on an upper end of the pressing member 81, one end of the first pressing spring 812 abuts against the abutting portion 821, the other end abuts against the step 811, and a first limiting portion 813 is disposed on a top of the pressing member 81. Through first roof pressure spring 812 for when the mainboard was not placed levelly and smoothly, pressing member 81 can the self-adaptation and provide stable packing force, has further improved the stability and the reliability of memory bank pulling out the process.

Referring to fig. 5, in some embodiments, a rubber pad 814 is disposed at a lower end of the pressing member 81 to prevent the main board from being scratched by the pressing member 81.

In some of these embodiments, the rubber pad 814 is detachably connected to the lower end of the pressing member 81, so that the rubber pad 814 can be replaced when worn.

Referring to fig. 5 and 6, in some embodiments, the first position-limiting portion 813 is detachably connected to the top of the pressing member 81, so as to facilitate the installation and the removal of the pressing member 81, and facilitate the assembly and the maintenance of the pressing member 81.

It should be noted that, in some embodiments, the first limiting portion 813 may be a screw screwed to the top of the pressing member 81, a nut screwed to the top of the pressing member 81, a T-shaped block clamped to the top of the pressing member 81, or other structures, which is not limited herein.

Referring to fig. 5, in some embodiments, the upper portion c and the lower portion d of the pressing member 81 are of a split structure, the lower portion d of the pressing member 81 is detachably connected to the upper portion c of the pressing member 81, and the lower portion d of the pressing member 81 with different lengths can be replaced according to actual requirements, so as to improve the adaptability of the pressing member 81.

Referring to fig. 7, 8 and 11, in some embodiments thereof, the clamping assembly 30 comprises:

the linear driving assembly is arranged on the mounting frame 20, and the limiting member 40 is arranged on the linear driving assembly;

the middle part of the clamping piece 31 is hinged to the limiting piece 40, the upper end of the clamping piece 31 is connected to the output end of the linear driving assembly, and the lower end of the clamping piece 31 is provided with a hook 311.

Through the cooperation between the breach of hook portion 311 and memory bank lateral part, it is spacing to form the memory bank in vertical direction to in the centre gripping of centre gripping subassembly 30 centre gripping memory bank pull out, and sharp drive assembly can drive holder 31 and rotate, make holder 31 open or draw in the lateral part of memory bank, its simple structure easily realizes, and the transmission is stable.

Referring to fig. 7 and 8, in some embodiments, the linear driving assembly includes a first cylinder 32, a connecting member 321 is disposed on a cylinder of the first cylinder 32, an upper end of the connecting member 321 slidably penetrates the mounting frame 20, an upper end of the connecting member 321 has a second limiting portion (not shown), a second pressing spring (not shown) is sleeved on the connecting member 321, one end of the second pressing spring abuts against the mounting frame 20, and the other end of the second pressing spring abuts against the cylinder of the first cylinder 32. The second top pressure spring makes the clamping assembly 30 in the process of removing the memory bank, the cylinder barrel of the first cylinder 32 can be self-adaptive to the unevenness phenomenon caused by the fact that the main board is not placed in place or shakes, and the stability and the reliability of the process of removing the memory bank are further improved.

It should be noted that, in some embodiments, a connecting block is disposed at an end of a piston rod of the first cylinder 32, a bar-shaped through hole is vertically disposed on the connecting block, a connecting shaft is hinged to an upper end of the clamping member 31, and the connecting shaft is slidably disposed in the bar-shaped through hole in an up-and-down direction.

It should be noted that, in some embodiments, the connecting member 321 may be a bolt screwed to the cylinder of the first cylinder 32, wherein the second limiting portion is a head of the bolt to facilitate installation and removal, the connecting member 321 may also be a connecting column integrally formed on the cylinder of the first cylinder 32, wherein the second limiting portion is a screw or a nut screwed to an upper end of the connecting member 321, and the linear driving assembly may also be a hydraulic cylinder, or a motor and a screw rod structure, which is not limited herein.

It should be noted that, in some embodiments, a lateral positioning column (not shown in the drawings) is disposed on the cylinder barrel of the first cylinder 32, a positioning hole (not shown in the drawings) is disposed on the mounting frame 20 corresponding to the lateral positioning column, a swing pin of the lateral positioning column is inserted into the positioning hole, and the lateral positioning column enables the cylinder barrel of the first cylinder 32 to be reset after a slight misalignment is generated between the cylinder barrel and the mounting frame 20 due to an uneven phenomenon of the adaptive main board.

It should be noted that, the side direction reference column includes main part, swing pin and spring, and the main part is open-topped tubular structure, and the swing pin inserts and locates in the main part, and the spring sets up between swing pin and main part, and the swing pin can overcome the elastic force swing of spring when receiving external force, and the swing pin can reset under the elastic force of spring when not receiving external force, specifically, refer to yi wei PT55 side direction reference column, german mark GN715 side thrust pin etc. in taiwan.

Referring to fig. 9 and 10, in some embodiments, the limiting member 40 is provided with a limiting groove 41 corresponding to the memory bank to limit the memory bank in the horizontal direction, so as to improve the stability of the memory bank during the unplugging process.

Referring to fig. 9 and 10, in some embodiments, an inclined surface 411 is disposed on the side wall of the limiting groove 41 at the bottom opening of the limiting groove 41, so that the opening of the limiting groove 41 is in a flaring structure, which is convenient for the limiting groove 41 to be in butt joint with the memory bank, and the inclined surface 411 has a guiding function.

Referring to fig. 3 and 4, in some embodiments, the first driving member 60 includes a servo motor, and a screw structure (not shown) and a rail structure are disposed between the first driving member 60 and the mounting frame 20 to drive the mounting frame 20 to move up and down.

Referring to fig. 3 and 4, it should be noted that in some embodiments, the guide rail structure includes a slide rail 11 disposed on the support 10 and a slide seat 21 disposed on the mounting frame 20, and the slide seat 21 is slidably connected to the slide rail 11, but the guide rail structure may also be a guide post and a linear bearing or other structures that are engaged with each other, and is not limited herein.

It should be noted that, in some embodiments, at least two first position sensors (not shown) are disposed on the bracket 10, and a detected member (not shown) is disposed on the sliding seat 21, so that the first position sensors and the detected member cooperate to control the lifting stroke of the mounting bracket 20.

Referring to fig. 4, 7 and 8, it should be noted that in some embodiments, the limiting member 40 is provided with a second position sensor 42 corresponding to the clamping member 31, and the opening and closing state of the clamping member 31 is fed back by the second position sensor 42 to ensure stability and reliability of the memory bank removing process, so as to prevent the clamping member 31 from being in an unopened state when the clamping member 30 descends, and prevent the mounting block 20 from failing to descend to the predetermined position due to interference between the clamping member 31 and the claws of the motherboard slot.

Referring to fig. 7, 8 and 12, in some embodiments, the upper end of the toggle member 50 is hinged to the mounting frame 20, the second driving member 70 includes a vertically arranged second cylinder, the upper portion of the toggle member 50 is provided with an extending portion 51 along the horizontal direction, and a piston rod of the second cylinder is connected to the extending portion 51, wherein the connection manner of the piston rod of the second cylinder and the extending portion 51 is suitable for the connection manner of the piston rod of the first cylinder 32 and the clamping member 31.

It should be noted that, in some embodiments, the middle portion of the toggle member 50 may be hinged to the mounting frame 20, the second cylinder is transversely disposed, and the upper end of the toggle member 50 is connected to the piston rod of the second cylinder.

It should be noted that, in some embodiments, at least two pairs of the clamping members 31 are provided, and the number of the second cylinders, the limiting grooves 41 and the poking members 50 is adapted to the clamping members, so as to improve the plucking efficiency.

Referring to fig. 11, it should be noted that, in some embodiments, the lower end of the clamping member 31 is provided with a plurality of hook portions 311 at intervals side by side, so that the second air cylinder can drive the plurality of hook portions 311 to clamp the memory bank by driving one clamping member 31, and the plurality of hook portions 311 can act synchronously, which is beneficial to improving the stability and reliability of the memory bank removing process.

Referring to fig. 12, it should be noted that, in some embodiments, the toggle element 50 includes a toggle rod 52 and a toggle claw 53, the extension portion 51 is disposed on the toggle rod 52, the toggle claw 53 is disposed in a plurality and is disposed side by side, and an avoidance opening 54 is disposed between two adjacent toggle claws 53 corresponding to the hook portion 311 and the memory bank, so that one toggle rod 52 can drive the plurality of toggle claws 53 to move, and the plurality of toggle claws 53 can move synchronously, which is beneficial to improving stability and reliability of the memory bank removing process.

In the description of the present specification, if reference is made to the description of "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", and "some examples", etc., reference is made to the terminology, it is intended that a particular feature, structure, material, or characteristic described in connection with the embodiment or example be included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a mechanism is pulled out to mainboard DRAM which characterized in that includes:

a support (10);

the mounting rack (20), the mounting rack (20) is arranged on the bracket (10) in a lifting manner;

the clamping assembly (30) is arranged on the mounting frame (20) and is used for clamping the memory bank;

the limiting piece (40), the limiting piece (40) is arranged on the clamping component (30) and is used for limiting the memory bank;

the poking piece (50) is rotatably arranged on the mounting rack (20) and is used for opening a claw of the main board slot;

the first driving piece (60), the first driving piece (60) is arranged on the bracket (10), and the output end of the first driving piece (60) is in transmission connection with the mounting rack (20);

the second driving piece (70), the second driving piece (70) is arranged on the mounting rack (20), and the output end of the second driving piece (70) is in transmission connection with the toggle piece (50);

the pressing assembly (80) is arranged on the mounting frame (20) and used for pressing the main board.

2. The mechanism of claim 1, wherein the pressing assembly (80) includes a pressing member (81) and a sleeve (82), the sleeve (82) is disposed on the bracket (10), an upper end of the pressing member (81) slidably penetrates through the sleeve (82), a step portion (811) is disposed on an upper portion of the pressing member (81), an abutting portion (821) is disposed on an upper end of the sleeve (82), a first pressing spring (812) is sleeved on an upper end of the pressing member (81), one end of the first pressing spring (812) abuts against the abutting portion (821), the other end of the first pressing spring abuts against the step portion (811), and a first limiting portion (813) is disposed on a top of the pressing member (81).

3. The mechanism for removing memory banks from a motherboard according to claim 2, wherein a rubber pad (814) is provided at the lower end of the pressing member (81).

4. The mechanism for removing memory banks from a motherboard according to claim 3, wherein said rubber pad (814) is detachably attached to the lower end of said pressing member (81).

5. The motherboard memory bank removing mechanism as recited in claim 2, wherein the first position-limiting portion (813) is detachably connected to the top of the pressing member (81).

6. The mechanism of claim 2, wherein the upper portion and the lower portion of the pressing member (81) are of a split structure, and the lower portion of the pressing member (81) is detachably connected to the upper portion of the pressing member (81).

7. The motherboard memory bank removal mechanism of claim 1, wherein the clamping assembly (30) comprises:

the linear driving assembly is arranged on the mounting frame (20), and the limiting piece (40) is arranged on the linear driving assembly;

the middle part of the clamping piece (31) is hinged to the limiting piece (40), the upper end of the clamping piece (31) is connected to the output end of the linear driving assembly, and a hook portion (311) is arranged at the lower end of the clamping piece (31).

8. The mechanism as claimed in claim 7, wherein the linear driving assembly includes a first cylinder (32), a connecting member (321) is disposed on a cylinder of the first cylinder (32), an upper end of the connecting member (321) slidably penetrates the mounting bracket (20), a second limiting portion is disposed at an upper end of the connecting member (321), a second pressing spring is sleeved on the connecting member (321), one end of the second pressing spring abuts against the mounting bracket (20), and the other end of the second pressing spring abuts against the cylinder of the first cylinder (32).

9. The motherboard memory bank removing mechanism according to claim 1, wherein the limiting member (40) is provided with a limiting groove (41) corresponding to the memory bank.

10. The mechanism for removing memory banks from a motherboard as claimed in claim 9, wherein the side wall of the position-limiting groove (41) is provided with an inclined surface (411) at the bottom opening of the position-limiting groove (41), so that the opening of the position-limiting groove (41) is in a flaring structure.

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