Pulling assisting device and case

Abstract

The utility model belongs to the technical field of unplugging aids, and discloses an unplugging aid and a case. The pulling assisting device comprises a mounting seat, a pulling assisting arm, a clockwork spring and a locking assembly, the mounting seat is used for mounting and fixing an external structure; one end of the pulling-assisting arm is rotationally connected with the mounting seat, and the pulling-assisting arm can rotate between a pulling-assisting position and a locking position, so that switching between a pulling-assisting state and a locking state is realized; the clockwork spring is arranged between the mounting seat and the pulling-assisting arm, so that the pulling-assisting arm can be kept at the pulling-assisting position; the locking assembly is arranged at the other end of the pulling assisting arm and used for being matched with an external structure to achieve locking, and the pulling assisting arm can be kept at the locking position. The case comprises at least one plug-in board card, and the plug-in board card is mounted or dismounted by using the unplugging assisting device.

Description

Technical Field

[0001] The utility model relates to the technical field of pull-out aids, in particular to a pull-out aid and a chassis. Background Art

[0002] With the development of electronic equipment technology, more and more plug-in servers are available in the server industry, which are easy to maintain and replace. As an important structural component for quick plug-in and pull-out, the pull-out aid is widely used in various plug-in sub-modules (hereinafter referred to as blade modules) of the plug-in server.

[0003] Before inserting the blade module into the chassis, the puller must be in the open state. There are currently two common solutions: 1. Use a wave spring washer to press the puller, so that the puller rotates with self-damping and can stay at any angle. Before inserting the blade module, manually open the puller to open it; 2. Use a torsion spring to open the puller.

[0004] However, when using wave spring washers to generate damping, before each blade module is inserted into the chassis, the two pullers must be manually opened to ensure that the pullers are fully opened before the blade module is inserted into the chassis. This operation is inconvenient and affects the plug-in experience. Blade modules are usually thin and compact, while torsion springs need to have a certain height (at least 2 times the spring wire diameter, and the height will be further increased to achieve a larger torsion angle and a smooth rotation feel). Especially when the puller is placed on the back of the PCB plug-in board, the addition of a torsion spring will increase the thickness and affect the compactness of the design. Utility Model Content

[0005] The utility model aims to provide an auxiliary puller, which can keep the auxiliary puller in the maximum open state in the auxiliary puller state, has little effect on the thickness of the plug-in board structure, and reduces the change of the plug-in board structure.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A pull-out aid comprises: a mounting seat for being mounted and fixed with an external structure; an pull-out aid arm, one end of which is rotatably connected with the mounting seat and can be rotated between a pull-out aid position and a locked position to achieve switching between the pull-out aid state and the locked state; a spring arranged between the mounting seat and the pull-out aid arm to keep the pull-out aid arm in the pull-out aid position; and a locking assembly arranged on the pull-out aid arm to cooperate with the external structure to achieve locking to keep the pull-out aid arm in the locked position.

[0008] Preferably, the locking assembly includes: a tail clip fixed on the blade extracting arm, with a sliding hole formed in the tail clip; a locking hook installed in the sliding hole and slidably connected to one end of the blade extracting arm; and an elastic member disposed between the locking hook and the tail clip, capable of keeping the locking hook in the locked position and restoring the locking hook to the locked position after the locking hook is unlocked.

[0009] Preferably, the locking hook includes a hook body portion and an operating portion, the operating portion (421) is disposed at one end of the hook body portion (422), making the locking hook (42) in a T shape, and a protrusion is provided on the operating portion to facilitate pushing the locking hook (42) to slide in the sliding hole (411); a guiding hole is formed in the hook body portion; a guiding rod is provided at one end of the blade extracting arm close to the locking assembly, the guiding rod is inserted into the guiding hole, and the elastic member is sleeved on the guiding rod.

[0010] Preferably, the tail clip further has a groove communicating with the sliding hole and extending along the extending direction of the guiding rod; the elastic member is disposed in the groove, and one end thereof abuts or is connected to the bottom of the groove, and the other end abuts or is connected to the locking hook.

[0011] Preferably, the locking assembly further includes a fixing member, and the tail clip and the blade extracting arm are connected through the fixing member.

[0012] Preferably, a first jack and a second jack are respectively formed on the tail clip and the blade extracting arm, the fixing member is inserted into the first jack and the second jack, and the tail clip is fixed to the blade extracting arm.

[0013] Preferably, a hook position is provided at one end of the blade extracting arm rotatably connected to the mounting seat, and a hook hole is formed on the mounting seat; hooks are respectively provided at both ends of the clockwork spring and are respectively connected to the hook position and the hook hole.

[0014] Preferably, a first rotating shaft and a second rotating shaft are provided on the mounting seat, the blade extracting arm is mounted on the first rotating shaft and can rotate along the axis of the first rotating shaft, the clockwork spring is sleeved on the second rotating shaft and can extend or contract radially with respect to the second rotating shaft.

[0015] Preferably, the first rotating shaft and the second rotating shaft are coaxially arranged, the diameter of the first rotating shaft is smaller than the diameter of the second rotating shaft, and the length of the first rotating shaft is greater than the length of the second rotating shaft.

[0016] Another object of the present invention is to provide a chassis capable of quickly inserting and extracting a plug-in board in a blade module with less change in the structure of the plug-in board, so that the internal structure of the chassis is compact and the space utilization rate of the chassis is improved.

[0017] To achieve this purpose, the utility model adopts the following technical solutions:

[0018] A chassis includes at least one pluggable board, and also includes the above-mentioned extraction aid. The external structure is the pluggable board, and the pluggable board uses the extraction aid for installation or disassembly.

[0019] The beneficial effects of the utility model:

[0020] The extraction aid provided by the utility model relies on a clockwork spring to automatically reset, and can keep the extraction aid in the maximum open state all the time. The clockwork spring is spirally unfolded. Even if the number of turns is more than 3 turns, the thickness occupied during installation is only 1 times the wire diameter of the spring, and the influence on the thickness of the pluggable board structure is relatively small; a locking component is arranged at the tail of the extraction aid. After the extraction aid is closed, the locking hook can be hooked by the lock catch on the pluggable board to prevent accidental opening, and the change of the structure of the pluggable board is relatively small. At the same time, the locking component is located at the tail end of the extraction aid, and the finger can lift the extraction aid while unlocking, which is convenient for operation. The chassis provided by the utility model can quickly plug and unplug the pluggable board in the blade module, and the change of the structure of the pluggable board is relatively small, so that the internal structure of the chassis is compact and the space utilization rate of the chassis is improved. Description of the drawings

[0021] Figure 1 is a schematic structural diagram of the extraction aid in an embodiment of the utility model;

[0022] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0023] Figure 3 is a schematic structural diagram of the extraction arm in an embodiment of the utility model;

[0024] Figure 4 is a sectional view of the extraction arm and the locking component in an embodiment of the utility model;

[0025] Figure 5 is a perspective view of the tail clip in an embodiment of the utility model;

[0026] Figure 6 is a schematic structural diagram of the locking hook in an embodiment of the utility model;

[0027] Figure 7 is a schematic structural diagram of the clockwork spring in an embodiment of the utility model;

[0028] Figure 8 is a schematic structural diagram of the mounting seat in an embodiment of the utility model;

[0029] Figure 9 is an assembly drawing of the extraction aid installed on the pluggable board in an embodiment of the utility model;

[0030] Figure 10 is Figure 9 an explosion schematic diagram of

[0031] Figure 11 is a schematic structural diagram after the chassis is installed in an embodiment of the present invention.

[0032] In the figure:

[0033] 1. Mounting base; 11. Hook hole; 12. First rotating shaft; 13. Second rotating shaft; 2. Extraction assisting arm; 21. Guide rod; 22. Second jack; 23. Hook position; 24. Rotating shaft hole; 3. Hairspring; 4. Locking assembly; 41. Tail clip; 411. Sliding hole; 412. Groove; 413. First jack; 42. Lock hook; 421. Operating part; 422. Hook body part; 4221. Guide hole; 43. Elastic member; 44. Fixing member; 5. Plug-in board; 51. Lock; 6. Washer; 7. Chassis. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] A kind of extractor disclosed by the present utility model, as Figure 1 shown, includes a mounting base 1, an extraction arm 2, a clockwork spring 3 and a locking assembly 4; the mounting base 1 is used for mounting and fixing with an external structure, and at the same time serves as the mounting and limiting structural member of the extraction arm 2; one end of the extraction arm 2 is rotatably connected to the mounting base 1, and the extraction arm 2 can rotate between an extraction position and a locking position to realize the switching between an extraction state and a locking state. Among them, the external structure can be a PCB plug-in board 5 in a blade server chassis 7. The extraction position is in the extraction state and is the position where the extraction arm 2 is maximally opened. The locking position is in the locking state and is the position when the locking assembly 4 is locked with the lock catch 51 on the plug-in board 5; as Figure 2 shown, the clockwork spring 3 is arranged between the mounting base 1 and the extraction arm 2, and can keep the extraction arm 2 in the extraction position when the extraction arm 2 is in the extraction state and there is no external force interference, and can make the extractor always maintain the maximum open state; the locking assembly 4 is arranged on the extraction arm 2 and is used for cooperating with the external structure to realize locking, and can keep the extraction arm 2 in the locking position. It can be understood that the extractor can be automatically opened by relying on the clockwork spring 3, so that the extractor always maintains the maximum open state. As Figure 7 shown, the clockwork spring 3 is spirally unfolded. Even if the number of turns is more than 3 turns, the thickness occupied during installation is only 1 times the wire diameter of the spring, and it will not cause an increase in the thickness of the plug-in board 5, thereby affecting the compactness of the blade module structure composed of multiple plug-in boards 5. In some specific embodiments, the locking assembly 4 is arranged at the other end of the extraction arm 2 away from the mounting base 1, making the operation of the extractor more convenient through the lever effect.

[0039] In some embodiments, as Figure 4 and Figure 5 shown, the locking assembly 4 includes a tail clip 41, a lock hook 42 and an elastic member 43; the tail clip 41 is sleeved on the extraction arm 2, a sliding hole 411 is arranged on the tail clip 41, the lock hook 42 is installed in the sliding hole 411 and is slidably connected to one end of the extraction arm 2; the elastic member 43 is arranged between the lock hook 42 and the tail clip 41, and can keep the lock hook 42 in the locking position and make the lock hook 42 return to the locking position after the lock hook 42 is unlocked. In some specific embodiments, as Figure 6As shown, the locking hook 42 includes a hook body portion 422 and an operating portion 421. The operating portion 421 is provided at one end of the hook body portion 422, making the locking hook 42 in a T shape. A protrusion is provided on the operating portion 421 to facilitate pushing the locking hook 42 to slide in the sliding hole 411; a guiding hole 4221 is provided on the hook body portion 422; as Figure 3 and Figure 4 shown, a guiding rod 21 is provided at one end of the assisting extraction arm 2 close to the locking assembly 4. The guiding rod 21 is inserted into the guiding hole 4221, and the elastic member 43 is sleeved on the guiding rod 21. It can be understood that a lock catch 51 is provided on the pluggable board 5. When locking is required, only the tail of the assisting extraction arm 2 needs to be pressed, so that the assisting extraction arm 2 rotates and approaches the lock catch 51 against the elastic force of the hairspring 3 until the locking hook 42 is inserted into the lock catch 51 and is automatically locked under the action of the elastic member 43; when unlocking, only the operating portion 421 needs to be toggled to move it against the elastic force of the elastic member 43, so that the hook body portion 422 is disengaged from the lock catch 51 to unlock. The assisting extraction arm 2 automatically springs open under the elastic force of the hairspring 3 and remains in the fully open state. At the same time, the locking hook 42 automatically resets under the action of the elastic member 43.

[0040] In some embodiments, as Figure 4 and Figure 5 shown, the tail clip 41 further has a groove 412 communicating with the sliding hole 411 and extending along the extending direction of the guiding rod 21; the elastic member 43 is arranged in the groove 412, and one end abuts or is connected to the bottom of the groove 412, and the other end abuts or is connected to the locking hook 42. It can be understood that the provision of the groove 412 can prevent the elastic member 43 from reaching the compression limit, thereby affecting the sliding stroke of the locking hook 42, ensuring the limiting accuracy of the sliding hole 411 for the locking hook 42, and at the same time making the structure of the tail clip 41 more compact. In some specific embodiments, the guiding rod 21 can pass through the sliding hole 411 and abut against the bottom wall of the groove 412 to perform installation limiting on the tail clip 41.

[0041] In some embodiments, the portion of the assisting extraction arm 2 sleeved with the tail clip 41 is recessed with a stepped surface. The stepped surface can be provided only on the two side surfaces in the width direction of the assisting extraction arm 2, or can be provided circumferentially along the surface of the assisting extraction arm 2. On the one hand, it is convenient for installation, and on the other hand, it does not increase the structural thickness.

[0042] In some embodiments, as Figure 4 shown, the locking assembly 4 further includes a fixing member 44. The tail clip 41 and the assisting extraction arm 2 are connected by the fixing member 44. In some specific embodiments, as Figure 3 and Figure 5As shown, a first jack 413 and a second jack 22 are respectively provided on the tail clip 41 and the assisting extraction arm 2. A fixing member 44 is inserted into the first jack 413 and the second jack 22 and fixes the tail clip 41 to the assisting extraction arm 2. It can be understood that the fixing member 44 can be set as a pin, and the length of the pin is not greater than the total thickness after the tail clip 41 and the assisting extraction arm 2 are sleeved, so as to prevent the pin from interfering with other external structures and causing damage to itself or external components. In other embodiments, in addition to the combination of the jack and the pin, it can also be other structures that can prevent the tail clip 41 from withdrawing from the end of the assisting extraction arm 2, such as using a hook member, a clamping member, or bonding, interference fit, etc.

[0043] In some embodiments, such as Figure 7 and Figure 8 As shown, a hook position 23 is provided at one end of the assisting extraction arm 2 rotatably connected to the mounting base 1, and a hook hole 11 is provided on the mounting base 1; hooks are respectively provided at both ends of the hairspring 3 and are respectively connected to the hook position 23 and the hook hole 11. In some specific embodiments, there are at least two hook holes 11 on the mounting base 1. The assisting extractor needs to be installed on both sides of one end of the pluggable board 5 respectively. Depending on the different installation positions of the mounting base 1, different hook holes 11 are used, which can play the role of facilitating installation. In addition, the initial elastic force of the hairspring 3 can be adjusted by adjusting the position of the hanging hole of the hairspring 3.

[0044] In some embodiments, a first rotating shaft 12 and a second rotating shaft 13 are provided on the mounting base 1. The assisting extraction arm 2 is installed on the first rotating shaft 12 and can rotate along the axis of the first rotating shaft 12. It can be understood that a rotating shaft hole 24 is provided on the assisting extraction arm 2, and the first rotating shaft 12 is inserted into the rotating shaft hole 24. The hairspring 3 is sleeved on the second rotating shaft 13. The hairspring 3 is spirally unfolded. Even if the number of turns is more than 3 turns, the thickness occupied during installation is only 1 times the wire diameter of the spring, and it will not cause an increase in the thickness of the pluggable board 5. The first rotating shaft 12 and the second rotating shaft 13 are coaxially arranged. The diameter of the first rotating shaft 12 is smaller than the diameter of the second rotating shaft 13, and the length of the first rotating shaft 12 is greater than the length of the second rotating shaft 13, which can ensure the stable installation of the hairspring 3 and the stable spiral expansion or contraction. It can be understood that, as Figure 7 As shown, a plurality of threaded holes are provided on the mounting base 1 for installing and fixing to the pluggable board 5. Threaded holes are also provided on the first rotating shaft 12 and are coaxially arranged with the first rotating shaft 12. As Figure 9 and Figure 10 As shown, the mounting base 1 and the first rotating shaft 12 are fixed to the pluggable board 5 through bolts, which is convenient for positioning the rotation center of the assisting extraction arm 2 and can make the assisting extraction arm 2 rotate more smoothly.

[0045] The utility model also discloses a chassis 7, which can quickly plug and unplug the plug-in card 5 in the blade module, and the structural change of the plug-in card 5 is small, so that the internal structure of the chassis 7 is compact and the space utilization rate of the chassis 7 is improved. Figure 11 As shown, the chassis 7 includes at least one plug-in board 5, and the plug-in board 5 is installed or removed using the above-mentioned pull-out aid. It can be understood that pull-out aids are provided on both sides of one end of each plug-in board 5, and the two pull-out aids are symmetrically arranged, thereby ensuring the stability of installation and convenience of removal of the plug-in board 5.

[0046] The assembly and installation process of the pull-out aid of the utility model is as follows:

[0047] First, take the two hook holes 11 set on the mounting seat 1 as an example, different hook holes 11 are used depending on the installation position; then the clockwork spring 3 is put on the second rotating shaft 13 of the mounting seat 1, and the hook at one end of the clockwork spring 3 is hooked into the hook hole 11 (depending on the position, the hook hole 11 installed is different); secondly, the rotating shaft hole 24 of the auxiliary pulling arm 2 is put on the first rotating shaft 12 of the mounting seat 1; pull the clockwork spring 3 so that the hook of the clockwork spring 3 is hooked into the hook position 23 of the auxiliary pulling arm 2; a gasket 6 is set between the mounting seat 1 and the plug-in board 5, specifically, the gasket 6 is installed on the first rotating shaft 12, and the gasket 6 can be a nylon washer to prevent the auxiliary extraction arm 2 from scratching the plug-in board 5; then put the assembled auxiliary extraction device as a whole into the installation hole of the plug-in board 5 and tighten it with a fixing screw; the tail clip 41 at the tail of the auxiliary extraction arm 2 is equipped with a locking hook 42, which is supported by an elastic member 43, and the auxiliary extraction arm 2 is inserted into the tail clip 41 and through the opening of the locking hook 42, and then inserted into the spring. When the sliding cap on the top of the locking hook 42 is turned, the locking hook 42 can slide along the auxiliary extraction arm 2 within a certain range, and finally pass through the first plug hole 413 and the second plug hole 22 through the fixing member 44 to fix the tail clip 41 and the auxiliary extraction arm 2. Of course, the installation of the tail clip 41 and the auxiliary extraction arm 2 can also be placed before the installation on the plug-in board 5, and the installation order of the various components of the tail clip 41 can also be changed, and no specific restrictions are made here.

[0048] The use process of the pull-out aid of the utility model is as follows:

[0049] Since one end of the spring 3 is hooked on the hook hole 11 on the mounting seat 1, and the other end is hooked on the hook position 23 of the auxiliary pulling arm 2, the spring 3 is in a tensioned state. When the tail of the auxiliary pulling arm 2 is subjected to force and rotates clockwise for a certain angle, as long as the torque disappears, the auxiliary pulling device will rotate counterclockwise under the elastic force of the spring 3 until the support foot at the top of the auxiliary pulling device presses against the limit column of the auxiliary pulling device seat, that is, it returns to the initial position. It can be understood that the auxiliary pulling arm 2 of the symmetrical auxiliary pulling device on the other side rotates in the opposite direction, which is only an exemplary description here and should not be regarded as a limitation on the rotation direction.

[0050] The tail of the extraction assisting arm 2 is provided with a tail clip 41. Since the extraction assisting arm 2 penetrates into the tail clip 41 and passes through the sliding hole 4221 of the locking hook 42 and finally inserts into the elastic member 43, when the operating part 421 at the top of the locking hook 42 is toggled, the locking hook 42 can slide along the extraction assisting arm 2 within a certain range; after the extraction assisting arm 2 is closed, its locking hook 42 will be hooked by the lock catch 51 on the pluggable board 5 to ensure that the extraction assisting arm 2 will not open without external force, realizing the locking of the pluggable board 5 after being installed in the chassis 7; when the operating part 421 at the top of the locking hook 42 is toggled, it can be unhooked, and at this time the extraction assisting arm 2 can be opened, and the extraction assisting arm 2 is pulled to realize the extraction and disassembly of the pluggable board 5 in the chassis.

[0051] The extraction assistor provided by the present utility model relies on a clockwork spring for automatic reset, and can keep the extraction assistor in the maximum open state all the time. The clockwork spring is spirally unfolded. Even if the number of turns is more than 3 turns, the thickness occupied during installation is only 1 times the wire diameter of the spring, and the influence on the thickness of the pluggable board structure is relatively small; a locking component is arranged at the tail of the extraction assistor. After the extraction assistor is closed, the locking hook can be hooked by the lock catch on the pluggable board to prevent accidental opening, and the structure of the pluggable board is changed relatively little. At the same time, the locking component is located at the tail end of the extraction assistor, and the extraction assistor can be lifted by fingers while unlocking, which is convenient to operate. The chassis provided by the present utility model can quickly plug and unplug the pluggable board in the chassis blade module, and the structure of the pluggable board is changed relatively little, so that the internal structure of the chassis is compact and the space utilization rate of the chassis is improved.

[0052] Obviously, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A pulling aid, characterized in that: include: A mounting seat (1) for mounting and fixing to an external structure; An auxiliary extraction arm (2), one end of which is rotatably connected to the mounting seat (1) and is capable of rotating between an auxiliary extraction position and a locking position to achieve switching between an auxiliary extraction state and a locking state; A spring (3) is arranged between the mounting seat (1) and the auxiliary pulling arm (2) and is capable of keeping the auxiliary pulling arm (2) in an auxiliary pulling position; A locking assembly (4) is arranged on the pulling-assisting arm (2) and is used to cooperate with an external structure to achieve locking, thereby enabling the pulling-assisting arm (2) to be kept in a locked position.

2. The extraction aid according to claim 1, characterized in that: The locking assembly (4) comprises: A tail clip (41) is fixed on the pulling-assisting arm (2), and a sliding hole (411) is provided on the tail clip (41); A locking hook (42) is installed in the sliding hole (411) and is slidably connected to one end of the auxiliary pulling arm (2); An elastic member (43) is arranged between the locking hook (42) and the tail clip (41), and is capable of keeping the locking hook (42) in a locking position matched with an external structure, and restoring the locking hook (42) to the locking position after the locking hook (42) is unlocked.

3. The extraction aid according to claim 2, characterized in that: The locking hook (42) comprises a hook body (422) and an operating portion (421), wherein the operating portion (421) is arranged at one end of the hook body (422) so as to facilitate pushing the locking hook (42) to slide in the sliding hole (411); The hook body (422) is provided with a guide hole (4221), and one end of the auxiliary pulling arm (2) close to the locking assembly (4) is provided with a guide rod (21), the guide rod (21) is inserted into the guide hole (4221), and the elastic member (43) is sleeved on the guide rod (21).

4. The extraction aid according to claim 3, characterized in that: The tail clip (41) also has a groove (412) which is in communication with the sliding hole (411) and extends along the extension direction of the guide rod (21); The elastic member (43) is arranged in the groove (412), with one end abutting or connected to the bottom of the groove (412), and the other end abutting or connected to the locking hook (42).

5. The extraction aid according to claim 2, characterized in that: The locking assembly (4) further comprises a fixing member (44), and the tail clip (41) and the auxiliary extraction arm (2) are connected via the fixing member (44).

6. The extraction aid according to claim 5, characterized in that: The tail clip (41) and the auxiliary pulling arm (2) are respectively provided with a first insertion hole (413) and a second insertion hole (22); the fixing member (44) is inserted into the first insertion hole (413) and the second insertion hole (22) to fix the tail clip (41) to the auxiliary pulling arm (2).

7. The extraction aid according to any one of claims 1 to 6, characterized in that: A hook position (23) is provided at one end of the auxiliary pulling arm (2) rotatably connected to the mounting seat (1), and a hook hole (11) is provided on the mounting seat (1); Hooks are respectively provided at both ends of the clockwork spring (3) and are respectively connected to the hook position (23) and the hook hole (11).

8. The extraction aid according to any one of claims 1 to 6, characterized in that: The mounting seat (1) is provided with a first rotating shaft (12) and a second rotating shaft (13); the auxiliary pulling arm (2) is mounted on the first rotating shaft (12) and can rotate along the axis of the first rotating shaft (12); and the spring spring (3) is sleeved on the second rotating shaft (13).

9. The extraction aid according to claim 8, characterized in that: The first rotating shaft (12) and the second rotating shaft (13) are coaxially arranged, the diameter of the first rotating shaft (12) is smaller than the diameter of the second rotating shaft (13), and the length of the first rotating shaft (12) is greater than the length of the second rotating shaft (13).

10. A chassis, comprising at least one plug-in board (5), characterized in that: It also comprises the extraction aid according to any one of claims 1 to 9, wherein the external structure is the plug-in board (5), and the plug-in board (5) is installed or removed using the extraction aid.

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