Extraction aid and combination cabinet

Abstract

The application provides a lifting assisting device and a combined case, wherein the lifting assisting device comprises a case, a transmission mechanism, a driving member and a lifting rod; the lifting rod is in sliding connection with the case, the driving member is in movable connection with the case, and the driving member is in movable connection with the transmission mechanism; the transmission mechanism is used for driving the lifting rod to slide when the driving member rotates relative to the case; the lifting rod is used for being inserted into a supporting hole on a target case to provide an upward supporting force for the target case, and is used for pressing against the target case to move the target case away from the case when the driving member moves relative to the case. The application can prevent the gravity of the target case or the expansion case from damaging the internal connector when the target case and the expansion case are docked or separated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extended electronic equipment, and in particular to an assisting device and a combined case. BACKGROUND

[0002] In the process of assembling and disassembling the extension case and the main case in most of the current extended electronic equipment, the connectors in the extension case and the main case are usually connected or separated with the extension case and the main case. However, due to the influence of the gravity of the connected extension case or main case during the plugging process, the connectors in the extension case and the main case are prone to shear force in the vertical direction during plugging, thereby causing damage to the connectors. SUMMARY

[0003] To solve the above problems, the assisting device and the combined case provided by the present application can prevent the gravity of the target case or the extension case from damaging the connectors inside the target case or the extension case when the target case and the extension case are connected or separated by setting a top rod.

[0004] In a first aspect, the present application provides an assisting device, comprising: a case, a transmission mechanism, a driving member and a top rod;

[0005] The top rod is slidingly connected with the case, the driving member is movably connected with the case, and the driving member is movably connected with the transmission mechanism;

[0006] The transmission mechanism is used to drive the top rod to slide when the driving member rotates relative to the case;

[0007] The top rod is used to be inserted into a support hole on the target case to provide an upward supporting force to the target case, and to press against the target case when the driving member moves relative to the case, so that the target case moves away from the case.

[0008] Optionally, the top rod comprises a pressing part and a supporting part, the supporting part is located at one end of the pressing part in a first straight line direction, the driving member is pivotally connected with the case along a second straight line direction, and the first straight line direction is perpendicular to the second straight line direction;

[0009] The pressing part is connected with the transmission mechanism, the supporting part is fixedly connected with the pressing part, the supporting part and the pressing part have the same center, and the cross section of the supporting part is smaller than that of the pressing part;

[0010] The supporting part is used to be inserted into the support hole along the first straight line direction to provide an upward supporting force to the target case;

[0011] The pressing part is used to press against the target case along the first straight line direction when the driving member rotates relative to the case, so that the target case moves in the first straight line direction.

[0012] Optionally, the assisting device further comprises a buckle member.

[0013] The buckle member is located on the side of the transmission mechanism away from the driving member, and the buckle member is movably connected with the shell, and the transmission mechanism is movably connected with the buckle member;

[0014] The buckle member is used for being inserted into the buckle opening of the target machine box in the direction away from the first straight line direction, so as to lock the target machine box and the shell;

[0015] The transmission mechanism is also used for driving the buckle member to move towards the first straight line direction, so as to separate the buckle member from the target machine box.

[0016] Optionally, the pulling aid device further comprises a first elastic reset member;

[0017] The first elastic reset member is located on the side of the buckle member towards the first straight line direction, one end of the first elastic reset member is connected with the shell, and the other end of the first elastic reset member is connected with the buckle member;

[0018] The first elastic reset member is used for pushing the buckle member to move away from the first straight line direction.

[0019] Optionally, the pulling aid device further comprises a pulling mechanism;

[0020] The transmission mechanism comprises a first transmission module and a second transmission module;

[0021] The buckle member is slidably connected with the shell along the first straight line direction and a third straight line direction respectively, the third straight line direction is perpendicular to the first straight line direction and the second straight line direction respectively, the pulling mechanism is connected with the first transmission module, and the driving member and the pressing part are both connected with the second transmission module;

[0022] The pulling mechanism is used for moving the buckle member along the first straight line direction through the first transmission module;

[0023] The driving member is used for sliding the pressing part in the first straight line direction through the second transmission module, and moving the buckle member in the third straight line direction through the second transmission module.

[0024] Optionally, the pulling aid device further comprises a second elastic reset member;

[0025] The pulling mechanism is located on the side of the transmission mechanism away from the first straight line direction, and the pulling mechanism is slidably connected with the shell along the first straight line direction, one end of the second elastic reset member is connected with the shell, and the other end of the second elastic reset member is connected with the pulling mechanism;

[0026] The pulling mechanism is used for moving along the first straight line direction to drive the buckle member to move along the first straight line direction, and moving away from the first straight line direction to drive the buckle member to move away from the first straight line direction;

[0027] The second elastic reset member is used for pushing the pulling mechanism to move away from the first straight line direction.

[0028] Optionally, the assisting pulling device further comprises a third elastic reset member;

[0029] One end of the third elastic reset member is connected with the casing, and the other end of the third elastic reset member is connected with the driving member, and the third elastic reset member is used to apply a first action force to the driving member to drive the driving member to rotate in a driving rotation direction, the driving rotation direction being one direction of rotation about the second straight line direction;

[0030] The driving member is used to drive the pressing part to slide in the first straight line direction through the second transmission module and drive the buckle member to move away from the buckle opening in the third straight line direction through the second transmission module when rotating in the driving rotation direction.

[0031] Optionally, the pulling mechanism comprises a pulling slider, a limiting member, a supporting shaft and a pressing slider;

[0032] The limiting member and the pressing slider are both located in the casing, the limiting member is fixedly connected with the pressing slider, the casing is provided with a limiting sliding hole in the first straight line direction, and the supporting shaft is fixedly connected with the pulling slider and the pressing slider through the limiting sliding hole;

[0033] The driving member is provided with an arc-shaped sliding groove and a straight-line sliding groove in the first straight line direction, the arc-shaped sliding groove is located at one end of the straight-line sliding groove facing the first straight line direction, the straight-line sliding groove is communicated with the arc-shaped sliding groove, and the limiting member is inserted into the straight-line sliding groove or the arc-shaped sliding groove and is in sliding connection with the driving member;

[0034] The casing is provided with a limiting structure at one end thereof away from the first straight line direction;

[0035] When the pressing slider is connected with the casing through the limiting structure, the limiting member is located in the straight-line sliding groove, and the limiting member applies a second action force to the driving member to overcome the first action force;

[0036] When the pressing slider is separated from the limiting structure, the limiting member moves into the arc-shaped sliding groove, and the third elastic reset member drives the driving member to drive the pressing part to slide in the first straight line direction through the second transmission module and drive the buckle member to move away from the buckle opening in the third straight line direction.

[0037] Optionally, the first transmission module comprises a first rack, a first gear transmission unit, a second rack and a pushing member;

[0038] The teeth on the first rack and the second rack are arranged along a first linear direction, the first gear transmission unit comprises at least one first gear, when the first gear is multiple, adjacent first gears are meshed with each other, the first rack is fixedly connected with the actuating mechanism and is meshed with adjacent first gears, the second rack is meshed with adjacent first gears and is in the same transmission direction as the first rack, the pushing piece is fixedly connected with the second rack, and the pushing piece is used for pushing the buckle piece to slide along the first linear direction.

[0039] The second transmission module comprises a rotating shaft, a third rack, a second gear transmission unit and a pressing piece.

[0040] The rotating shaft passes through the shell, the driving piece and the second gear transmission unit along a second linear direction, and the driving piece and the second gear transmission unit are both rotationally connected with the shell through the rotating shaft.

[0041] The teeth on the third rack are arranged along a third linear direction, the third rack is located on the side of the second gear transmission unit facing the buckle piece, the third rack is meshed with the second gear transmission unit and is slidingly connected with the shell along the third linear direction, the teeth on the fourth rack are arranged along the first linear direction, the fourth rack is meshed with the second gear transmission unit and is fixedly connected with the ejector rod, and the driving piece is used for driving the third rack to move along the third linear direction and driving the fourth rack to move along the first linear direction through the second gear transmission unit when the driving piece rotates along a driving rotation direction.

[0042] The pressing piece is fixedly connected with the third rack, the pressing piece is inserted into the buckle piece along the first linear direction, and the pressing piece is used for driving the buckle piece to slide along the third linear direction.

[0043] The second gear transmission unit comprises an odd number of second gears arranged along the first linear direction, when the second gears are multiple, the multiple second gears are arranged along the first linear direction and are meshed with each other, and the third rack and the fourth rack are respectively meshed with the second gear farthest from the driving piece.

[0044] In the second aspect, the application provides a combined machine box comprising: a first machine box and the ejection assisting device according to any one of the above.

[0045] The shell is fixedly connected with the first machine box, and the driving piece is exposed to the first machine box.

[0046] The ejection assisting device and the combined machine box provided by the application can make the ejector rod inserted into the supporting hole on the target machine box when the target machine box is docked with or separated from the expansion machine box provided with the ejection assisting device, so that the target machine box and the expansion machine box form a mutual supporting relationship, thereby avoiding damage to the connectors inside the target machine box or the expansion machine box caused by the gravity of the target machine box or the expansion machine box. Meanwhile, the ejector rod can also play an ejection assisting role when the target machine box is separated from the expansion machine box by cooperating with the driving piece. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0048] Figure 1 a schematic structural view of the assisting device of an embodiment of the present application;

[0049] Figure 2 a schematic exploded view of the assisting device of an embodiment of the present application;

[0050] Figure 3 a schematic exploded view of the assisting device of an embodiment of the present application;

[0051] Figure 4 a schematic structural view of the assisting device of an embodiment of the present application in a working state;

[0052] Figure 5a a sectional view of the assisting device of an embodiment of the present application in an initial locking state, and along a transmission direction of a first transmission module;

[0053] Figure 5b a sectional view of the assisting device of an embodiment of the present application in an initial locking state, and along a transmission direction of a second transmission module;

[0054] Figure 6a a sectional view of the assisting device of an embodiment of the present application in a state that the driving slider is moved to the leftmost end of its moving track, and along a transmission direction of a first transmission module;

[0055] Figure 6b a sectional view of the assisting device of an embodiment of the present application in a state that the driving slider is moved to the leftmost end of its moving track, and along a transmission direction of a second transmission module;

[0056] Figure 7a a sectional view of the assisting device of an embodiment of the present application in a state that the driving member is turned over along a driving rotation direction, and along a transmission direction of a first transmission module;

[0057] Figure 7b a sectional view of the assisting device of an embodiment of the present application in a state that the driving member is turned over along a driving rotation direction, and along a transmission direction of a second transmission module;

[0058] Figure 8aA sectional view of the assisting device of one embodiment of the present application when the driving member is turned to a limit position in the driving rotation direction and the section is taken along the transmission direction of a first transmission module;

[0059] Figure 8b A sectional view of the assisting device of one embodiment of the present application when the driving member is turned to a limit position in the driving rotation direction and the section is taken along the transmission direction of a second transmission module;

[0060] Figure 9 A structural view of the combined case of one embodiment of the present application in a docking completed state;

[0061] Figure 10 A structural view of the combined case of one embodiment of the present application in a separated state.

[0062] Reference signs

[0063] 1, case; 11, mounting seat; 111, mounting bin; 112, first clamping hole; 113, second clamping hole; 114, third guide sliding groove; 115, limiting sliding groove; 116, supporting plate; 117, limiting structure; 118, mounting hole; 12, first baffle; 121, first clasp; 122, limiting sliding hole; 123, first guide sliding groove; 13, second baffle; 131, second clasp; 132, second guide sliding groove; 133, fourth guide sliding groove; 2, transmission mechanism; 21, first transmission module; 211, first rack; 2111, first sliding rod; 212, first gear transmission unit; 213, second rack; 2131, second sliding rod; 214, pushing member; 22, second transmission module; 221, rotating shaft; 222, third rack; 2221, third sliding rod; 223, second gear transmission unit; 224, fourth rack; 2241, fourth sliding rod; 225, pressing member; 3, driving member; 31, arc-shaped sliding groove; 32, linear sliding groove; 33, storage groove; 4, jacking rod; 41, supporting portion; 42, jacking portion; 5, clasp member; 51, clasp portion; 52, connecting portion; 53, plug hole; 61, first elastic reset member; 62, second elastic reset member; 63, third elastic reset member; 7, actuating mechanism; 71, actuating sliding block; 72, limiting member; 73, supporting shaft; 74, pressing sliding block; 8, target case; 81, supporting hole; 82, clasp opening; 9, expansion case. DETAILED DESCRIPTION

[0064] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0066] Spatially relative terms, such as "under", "below", "lower", "over", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described herein is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in the other direction, and the spatially relative terms used herein are intended to encompass such additional orientations. It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described herein is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in the other direction, and the spatially relative terms used herein are intended to encompass such additional orientations.

[0067] It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is to be further understood that the terms "comprising", "including", and "having" or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

[0068] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is to be further understood that the terms "comprising", "including", and "having" or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

[0069] In a first aspect, an embodiment of the present application provides a lifting aid device, referring to Figure 1 、 Figure 2 and Figure 3 The lifting aid device comprises a housing 1, a transmission mechanism 2, a driving member 3 and a jacking rod 4. The jacking rod 4 is in sliding connection with the housing 1, the driving member 3 is in movable connection with the housing 1, and the driving member 3 is in movable connection with the transmission mechanism 2.

[0070] In combination with Figure 4The transmission mechanism 2 is used to drive the top rod 4 to slide when the driving member 3 rotates relative to the casing 1; the top rod 4 is used to be inserted into the support hole 81 on the target casing 8 to provide an upward supporting force to the target casing 8, and to press against the target casing 8 when the driving member 3 moves relative to the casing 1, so as to move the target casing 8 away from the casing 1.

[0071] It should be noted that the driving member 3 can be connected with the casing 1 in a sliding manner or be pivotally connected with the casing 1, and the transmission mechanism 2 can be a gear structure, a gear and rack structure, a multi-link structure or an electric push rod, or a combination of any two of the gear structure, the gear and rack structure and the multi-link structure.

[0072] For example, the driving member 3 is connected with the casing 1 in a sliding manner along the left-right direction, the transmission mechanism 2 is an electric push rod, and the electric push rod is provided with a travel switch; when the driving member 3 moves from the right side of the travel switch to the left side of the travel switch, the driving member 3 drives the travel switch to move from a first position state to a second position state, the electric push rod drives the driving member 3 to move leftward and to be inserted into the support hole 81; when the driving member 3 continues to move leftward, the driving member 3 drives the travel switch to move from the second position state to a third position state, the electric push rod drives the driving member 3 to continue to move leftward, so that the top rod 4 presses against the target casing 8, and the target casing 8 is separated from the expansion casing 9 provided with the ejection device; when the driving member 3 moves rightward, the driving member 3 drives the travel switch to move from the third position state to the first position state, the electric push rod drives the driving member 3 to move rightward, and the top rod 4 is retracted into the expansion casing 9.

[0073] In the embodiment, the top rod 4 is inserted into the support hole 81 on the target casing 8 when the target casing 8 is docked with or separated from the expansion casing 9 provided with the ejection device, so that the target casing 8 and the expansion casing 9 form a mutual supporting relationship. Therefore, when the target casing 8 is docked with or separated from the expansion casing 9, the connectors inside the target casing 8 or the expansion casing 9 will not be subjected to a vertical shearing force due to the gravity of the casing, so as to avoid damaging the connectors. Meanwhile, the top rod 4 can also play a role of ejection when the target casing 8 is separated from the expansion casing 9 by cooperating with the driving member 3. Specifically, the top rod 4 is connected with the casing 1 in a sliding manner along a first linear direction.

[0074] In combination Figure 5a and Figure 5b The top rod 4 comprises a supporting portion 41 and a pressing portion 42. The supporting portion 41 is located at one end of the pressing portion 42 in the first linear direction, and the driving member 3 is pivotally connected with the casing 1 along a second linear direction. The pressing portion 42 is connected with the transmission mechanism 2, and the supporting portion 41 is fixedly connected with the pressing portion 42. The first linear direction is perpendicular to the second linear direction.

[0075] The support part 41 is used for inserting into the support hole 81 along the first linear direction to provide upward support force to the target case 8; the pressing part 42 is used for pressing the target case 8 along the first linear direction when the driving part 3 rotates relative to the case 1, so as to move the target case 8 to the first linear direction.

[0076] In the embodiment, the support part 41 and the pressing part 42 are both rod-shaped structures, and the support part 41 and the pressing part 42 are fixedly connected in an integrated manner; the support part 41 and the pressing part 42 are coaxial, and the cross section of the support part 41 is smaller than that of the pressing part 42; the first linear direction is a leftward direction, and the second linear direction is a rearward direction.

[0077] The case 1 comprises a mounting seat 11, a first baffle 12 and a second baffle 13. The mounting seat 11 is internally formed with a mounting bin 111 with an upward opening, and the mounting seat 11 is provided with four mounting holes 118 at the top thereof, and is used for being fixed on the expansion case 9 through cooperation of the mounting holes 118 and screws; the first baffle 12 and the second baffle 13 are both horizontally located at the top of the mounting bin 111, and the first baffle 12 is located at the right side of the second baffle 13; the first baffle 12 is fixedly provided with first buckles 121 at both ends thereof, and the second baffle 13 is fixedly provided with second buckles 131 at both ends thereof; the mounting seat 11 is provided with a first clamping hole 112 and a second clamping hole 113 on the inner side walls thereof; the first buckles 121 are clamped with the mounting seat 11 through the first clamping hole 112, so as to fix the first baffle 12 on the mounting seat 11; and the second buckles 131 are clamped with the mounting seat 11 through the second clamping hole 113, so as to fix the second baffle 13 on the mounting seat 11.

[0078] In an alternative embodiment, the assisting device further comprises a buckle part 5. The buckle part 5 is located on the side of the transmission mechanism 2 away from the driving part 3, and is slidably connected with the case 1 along the first linear direction or is pivotally connected with the case 1 along the second linear direction; and the transmission mechanism 2 is movably connected with the buckle part 5.

[0079] The buckle part 5 is used for inserting into a buckle opening 82 of the target case 8 along a direction away from the first linear direction, so as to lock the target case 8 with the case 1; and the transmission mechanism 2 is further used for driving the buckle part 5 to move towards the first linear direction, so as to separate the buckle part 5 from the target case 8.

[0080] In the alternative embodiment, the buckle part 5 comprises a buckle part 51 and a connecting part 52. The connecting part 52 is located in the case 1, one end of the buckle part 51 is fixedly connected with the connecting part 52, the other end of the buckle part 51 is a bent structure bent away from the first linear direction and extends out of the case 1, and the other end of the buckle part 51 is used for being inserted into the buckle opening 82 of the target case 8 along a direction away from the first linear direction.

[0081] By setting the buckle piece 5, the buckle part 51 in the buckle piece 5 can be inserted into the buckle opening 82 during the docking process of the target case 8 and the expansion case 9, the relative position of the target case 8 and the expansion case 9 can be limited, so that the target case 8 and the shell 1 are locked. At the same time, by connecting the buckle piece 5 with the transmission mechanism 2, when the target case 8 and the expansion case 9 need to be separated, the buckle part 51 is separated from the buckle opening 82 by controlling the transmission mechanism 2, so that the expansion case 9 is conveniently detached from the target case 8.

[0082] In an optional embodiment, the pulling assisting device further comprises a first elastic reset piece 61. The first elastic reset piece 61 is located on the side of the buckle piece 5 facing the first straight line direction, one end of the first elastic reset piece 61 is connected with the shell 1, and the other end of the first elastic reset piece 61 is connected with the buckle piece 5.

[0083] The first elastic reset piece 61 is used for pushing the buckle piece 5 to move away from the first straight line direction. The first elastic reset piece 61 can be a reset spring or a reset spring sheet. In this optional embodiment, the first elastic reset piece 61 is a reset spring.

[0084] By setting the first elastic reset piece 61, the connecting part 52 can automatically push the connecting part 52 to move to the right under the action of the first elastic reset piece 61, so that the buckle part 51 can be stably inserted into the buckle opening 82 during the locking process of the target case 8 and the shell 1, thereby improving the firmness of the locking of the target case 8 and the shell 1.

[0085] In an optional embodiment, the pulling assisting device further comprises a pulling mechanism 7. The transmission mechanism 2 comprises a first transmission module 21 and a second transmission module 22.

[0086] The buckle piece 5 is slidably connected with the shell 1 along the first straight line direction and the third straight line direction. The pulling mechanism 7 is connected with the first transmission module 21, and the driving piece 3 and the pressing part 42 are both connected with the second transmission module 22. The third straight line direction is perpendicular to the first straight line direction and the second straight line direction.

[0087] The pulling mechanism 7 is used for driving the buckle piece 5 to move along the first straight line direction through the first transmission module 21. The driving piece 3 is used for driving the pressing part 42 to slide in the first straight line direction through the second transmission module 22, and driving the buckle piece 5 to move in the third straight line direction through the second transmission module 22.

[0088] In this optional embodiment, a limiting sliding groove 115 is formed at the bottom of the left end of the mounting seat 11. The third straight line direction is a downward direction, and the bottom end of the connecting part 52 is slidably connected with the mounting seat 11 in the left-right and up-down directions through the limiting sliding groove 115.

[0089] By setting the toggle mechanism 7, the operator can drive the first transmission module 21 in the transmission mechanism 2 by operating the toggle mechanism 7 to control the buckle 5 to move along the first linear direction. It should be noted that the toggle mechanism 7 and the driving part 3 can be moved relative to the mounting seat 11 in a manual operation mode through a mechanical structure, or can be moved relative to the mounting seat 11 in an electric control mode through a driving circuit, which is not limited in the alternative embodiment.

[0090] In an alternative embodiment, the toggle mechanism 7 moves relative to the mounting seat 11 in a manual operation mode through a mechanical structure. Specifically, the pulling aid device further comprises a second elastic reset member 62.

[0091] The toggle mechanism 7 is located on the side of the transmission mechanism 2 away from the first linear direction, and the toggle mechanism 7 is slidingly connected to the casing 1 along the first linear direction. One end of the second elastic reset member 62 is connected to the casing 1, and the other end of the second elastic reset member 62 is connected to the toggle mechanism 7.

[0092] The toggle mechanism 7 is used to move along the first linear direction to drive the buckle 5 to move along the first linear direction, and is used to move away from the first linear direction to drive the buckle 5 to move away from the first linear direction. The second elastic reset member 62 is used to push the toggle mechanism 7 to move away from the first linear direction. The second elastic reset member 62 can be a reset spring or a reset spring sheet. In the alternative embodiment, the second elastic reset member 62 is a reset spring, and the two ends of the second elastic reset member 62 are respectively sleeved on the right limiting protrusion of the casing 1 and the left limiting protrusion of the toggle mechanism 7.

[0093] By setting the second elastic reset member 62, the toggle mechanism 7 can be automatically moved to the right when it is not controlled by the outside world, so as to push the toggle mechanism 7 to the starting position where it can be moved to the left, so that the toggle mechanism 7 can be moved to the left multiple times within a limited movement track, and thus the buckle 5 can be separated from the buckle opening 82 when the toggle mechanism 7 is driven to move to the left each time, thereby reducing the complexity of the operation of the pulling aid device and improving the space utilization of the pulling aid device.

[0094] In an alternative embodiment, the pulling aid device further comprises a third elastic reset member 63.

[0095] One end of the third elastic reset member 63 is connected to the casing 1, and the other end of the third elastic reset member 63 is connected to the driving part 3. The third elastic reset member 63 is used to exert a first force on the driving part 3 to drive the driving part 3 to rotate around a driving rotation direction. The driving rotation direction is one direction of rotation around the second linear direction; and the third elastic reset member 63 is a torsion spring or a V-shaped spring sheet.

[0096] The driving member 3 is used to drive the pressing part 42 to slide along the first linear direction and drive the buckle member 5 to move away from the buckle opening 82 along the third linear direction through the second transmission module 22 when rotating along the driving rotation direction.

[0097] In the optional embodiment, the third elastic reset member 63 is a torsion spring, and the number of the third elastic reset member 63 is two, and the two third elastic reset members 63 are arranged along the front-rear direction; the bottom of the left end of the driving member 3 is provided with two storage grooves 33 along the front-rear direction, and the two third elastic reset members 63 are respectively located in the storage grooves 33; the rotation direction of the driving member 3 is the clockwise rotation direction along the second linear direction. By arranging the third elastic reset member 63, the driving member 3 can automatically rotate along the rotation direction without being affected by other external forces, thereby automatically driving the jack 4 to press against the target case 8 to separate the target case 8 from the expansion case 9, and automatically moving the buckle part 51 away from the buckle opening 82 to facilitate the disassembly of the expansion case 9.

[0098] Further, the pushing mechanism 7 comprises a pushing slider 71, a limiting member 72, a supporting shaft 73 and a pressing slider 74.

[0099] The limiting member 72 and the pressing slider 74 are both located in the mounting bin 111, the limiting member 72 is fixedly connected with the pressing slider 74, and the pushing slider 71 is located above the first baffle 12. The limiting member 72 is provided with a limiting sliding hole 122 along the first linear direction. The supporting shaft 73 is fixedly connected with the pushing slider 71 and the pressing slider 74 through the limiting sliding hole 122, and the supporting shaft 73 is slidably connected with the first baffle 12 through the limiting sliding hole 122 along the first linear direction.

[0100] The driving member 3 is provided with an arc-shaped sliding groove 31 and a linear sliding groove 32 along the first linear direction. The arc center of the arc-shaped sliding groove 31 coincides with the axis of the driving member 3; the arc-shaped sliding groove 31 is located at one end of the linear sliding groove 32 facing the first linear direction; the left end of the linear sliding groove 32 communicates with the arc-shaped sliding groove 31; the limiting member 72 is inserted into the guide sliding groove composed of the linear sliding groove 32 and the arc-shaped sliding groove 31 and is slidably connected with the driving member 3. The linear sliding groove 32 can communicate with the top end or the middle part of the arc-shaped sliding groove 31.

[0101] The housing 1 is provided with a limiting structure 117. The limiting structure 117 is located at one end of the housing 1 away from the first linear direction. The limiting structure 117 can be a protrusion fixed on the inner wall of the mounting seat 11 or the inner wall of the first baffle 12, or an opening provided on the mounting seat 11.

[0102] When the abutting block 74 is connected to the mounting base 11 through the limiting structure 117, the limiting member 72 is located in the linear sliding groove 32, and the limiting member 72 exerts a second force on the driving member 3 to overcome the first force on the driving member 3.

[0103] When the abutting block 74 is separated from the limiting structure 117, the limiting member 72 moves to the arc-shaped sliding groove 31, and the third elastic reset member 63 drives the driving member 3 to slide the abutting portion 42 in the first linear direction through the second transmission module 22 and drives the buckle member 5 to move away from the buckle opening 82 in the third linear direction.

[0104] In this alternative embodiment, the upper surface of the dialing block 71 is sawtooth-shaped; the linear sliding groove 32 can be in communication with the top end of the arc-shaped sliding groove 31; and the limiting structure 117 is an opening through the right side wall of the mounting base 11. In this way, the second elastic reset member 62 can automatically push the dialing mechanism 7 to move to the right when the dialing mechanism 7 is not controlled by the outside world, so that the abutting block 74 is inserted into the limiting structure 117 and the abutting block 74 is prevented from being separated from the limiting structure 117 due to vibration. By providing the limiting structure 117, the dialing mechanism 7 can prevent the driving member 3 from rotating in the driving rotation direction, thereby limiting the position of the top rod 4 relative to the support hole 81 and limiting the position of the buckle portion 51 in the up-down direction relative to the buckle opening 82, which facilitates the docking and separation of the target case 8 and the expansion case 9.

[0105] In an alternative embodiment, the first transmission module 21 includes a first rack 211, a first gear transmission unit 212, a second rack 213, and a pushing member 214.

[0106] The teeth on the first rack 211 and the second rack 213 are arranged in the first linear direction, and the first gear transmission unit 212 includes at least one first gear. When there are multiple first gears, adjacent first gears are meshed with each other. The first rack 211 is fixedly connected to the dialing mechanism 7 and is meshed with adjacent first gears. The second rack 213 is meshed with adjacent first gears and has the same transmission direction as the first rack 211.

[0107] When the number of first gears is even, the first rack 211 and the second rack 213 are located on opposite sides of the first gear transmission unit 212 in the up-down direction; when the number of first gears is odd, the first rack 211 and the second rack 213 are located on the same side of the first gear transmission unit 212 in the up-down direction.

[0108] The pushing member 214 is fixedly connected to the second rack 213 and is located on the side of the buckle member 5 facing the dialing mechanism 7. The pushing member 214 is used to push the buckle member 5 to slide in the first linear direction.

[0109] In the optional embodiment, the pushing member 214 is used to push the connecting part 52 to slide along the first linear direction; the number of the first gears is three; two support plates 116 arranged along the front and back directions are fixedly arranged in the mounting base 11, and the three first gears are located between the two support plates 116 and rotationally connected with the two support plates 116 along the front and back directions; the first rack 211 and the second rack 213 are both located above the first gear transmission unit 212.

[0110] The upper surface of the first rack 211 is fixedly provided with a first sliding rod 2111, the first baffle 12 is provided with a first guide sliding groove 123 along the first linear direction, and the first sliding rod 2111 is slidably connected with the first baffle 12 through the first guide sliding groove 123; the upper surface of the second rack 213 is fixedly provided with a second sliding rod 2131, the second baffle 13 is provided with a second guide sliding groove 132 along the first linear direction, and the second sliding rod 2131 is slidably connected with the second baffle 13 through the second guide sliding groove 132. The first sliding rod 2111 can ensure the stability of the structure of the first transmission module 21. In an optional embodiment, the upper surfaces of the first rack 211 and the second rack 213 are respectively attached to the first baffle 12 and the second baffle 13, so as to further ensure the stability of the structure of the first transmission module 21.

[0111] In an optional embodiment, the second transmission module 22 comprises a rotating shaft 221, a third rack 222, a second gear transmission unit 223, a fourth rack 224 and a pressing member 225.

[0112] The rotating shaft 221 passes through the mounting base 11, the driving member 3 and the second gear transmission unit 223 along the second linear direction, and the driving member 3 and the second gear transmission unit 223 are both rotationally connected with the casing 1 through the rotating shaft 221.

[0113] The teeth on the third rack 222 are arranged along the third linear direction, the third rack 222 is located on the side of the second gear transmission unit 223 facing the buckle member 5, the third rack 222 is engaged with the second gear transmission unit 223 and slidably connected with the mounting base 11 along the third linear direction; the teeth on the fourth rack 224 are arranged along the first linear direction, the fourth rack 224 is engaged with the second gear transmission unit 223 and fixedly connected with the top rod 4, and the driving member 3 is used to drive the third rack 222 to move along the third linear direction and the fourth rack 224 to move along the first linear direction through the second gear transmission unit 223 when rotating along the driving rotation direction;

[0114] The pressing member 225 is fixedly connected with the third rack 222, the pressing member 225 is inserted with the buckle member 5 along the first linear direction, and the pressing member 225 is used to drive the buckle member 5 to slide along the third linear direction;

[0115] The second gear transmission unit 223 comprises an odd number of second gears arranged along the first linear direction; when the second gears are multiple, the multiple second gears are arranged along the first linear direction and mesh with each other, and the third rack 222 and the fourth rack 224 are respectively meshed with the second gears farthest from the driving member 3.

[0116] In the optional embodiment, the number of the second gears is one, the number of the third rack 222, the fourth rack 224, the second gear transmission unit 223, the pressing member 225 and the ejector rod 4 is two, and they are arranged along the front-rear direction; wherein the two ejector rods 4 are respectively located on the front and rear sides of the buckle member 5, and the two second gear transmission units 223 are respectively located on the front and rear sides of the first gear transmission unit 212; the rotating shaft 221 is fixedly connected with the driving member 3 and the second gear, and is rotatably connected with the mounting seat 11; the fourth rack 224 is located on the side of the top pressing portion 42 away from the supporting portion 41, and is located above the second gear.

[0117] Further, the pressing member 225 is located on the side of the third rack 222 facing the first linear direction and is fixedly connected with the third rack 222, and the pressing member 225 is a rod-shaped structure; the connecting portion 52 is provided with two insertion holes 53, the insertion holes 53 penetrate through the connecting portion 52 along the first linear direction, and the two pressing members 225 are respectively inserted with the connecting portion 52 through the corresponding insertion holes 53.

[0118] The front and rear surfaces of the third rack 222 are fixedly provided with third sliding rods 2221. The front and rear side walls of the mounting seat 11 are respectively provided with third guide sliding grooves 114 along the third linear direction. The third sliding rods 2221 are slidably connected with the mounting seat 11 through the third guide sliding grooves 114. The upper surface of the fourth rack 224 is fixedly provided with a fourth sliding rod 2241, and the second blocking piece 13 is provided with a fourth guide sliding groove 133 along the first linear direction. The fourth sliding rod 2241 is slidably connected with the second blocking piece 13 through the fourth guide sliding groove 133.

[0119] The working principle of the device is as follows:

[0120] In the state that the assisting device is located in the expansion case 9, and supports and locks the target case 8, that is, the assisting device is in the initial locking state, the poking mechanism 7 is located at the right end of the installation bin 111 under the elastic force of the second elastic reset member 62; due to the limiting of the first stop sheet 12 to the supporting shaft 73, the abutting block 74 is stopped in the limiting structure 117 of the installation seat 11. At the left end of the installation seat 11, due to the elastic force of the first elastic reset member 61 to the right, the buckle part 51 is completely matched with the buckle opening 82 and is hooked, at this time, the second rack 213 abutting the connecting part 52 is located at the rightmost end of the moving track. Due to the insertion of the limiting member 72 into the linear sliding groove 32 on the driving member 3, at this time, the driving member 3 is in the closed state, and cannot move in the driving rotation direction under the elastic force of the third elastic reset member 63. At the same time, the supporting part 41 is inserted into the supporting hole 81 of the target case 8, but at this time, the abutting part 42 towards the end face of the target case 8 does not abut against the end face of the target case 8. In this way, the close cooperation of the target case 8 and the expansion case 9 is realized, and due to the elastic force of the first elastic reset member 61 and the second elastic reset member 62, the locking of the target case 8 and the expansion case 9 has a self-locking effect, so that the butt joint of the target case 8 and the expansion case 9 can resist vibration and is not easy to be loosened.

[0121] In combination Figure 6a and Figure 6b When the operator moves the slider 71 to the left by hand, the first rack 211 and the abutting block 74 move to the left and begin to remove the limiting structure 117, wherein the first rack 211 drives the gear set on the first gear transmission unit 212 to rotate, thereby driving the second rack 213 on the left side to also move to the left. The second rack 213 pushes the buckle member 5 to move to the left, and makes the buckle part 51 disengage from the buckle opening 82 on the target case. At this time, the limiting member 72 slides from the linear sliding groove 32 into the arc-shaped sliding groove 31. At this time, the driving member 3 will rotate in the driving rotation direction due to the elastic force of the third elastic reset member 63.

[0122] In combination Figure 7a and Figure 7bIn the process of rotating the driving member 3 in the driving rotation direction, the first gear transmission unit 212 and the second rack 213 are kept still due to the restriction of the first stopper 12. At the same time, the driving member 3 drives the second gear on the second gear transmission unit 223 to rotate, and the fourth rack 224 horizontally engaged with the second gear transmission unit 223 drives the top rod 4 to move left. In this process, the left end surface of the top pressing part 42 is in contact with the end surface of the case, and the buckle member 5 connected with the pressing member 225 moves downward with the pressing member 225, thereby moving away from the buckle opening 82 and being horizontally misaligned with the bent edge of the buckle opening 82 of the target case 8, so as to separate the target case 8 and the expansion case 9 in the horizontal direction.

[0123] In combination Figure 8a and Figure 8b The third rack 222 drives the buckle member 5 to move downward due to the insertion of the pressing member 225 on the left side of the third rack 222 into the insertion hole 53 of the buckle member 5. After that, the driving member 3 continues to rotate in the driving rotation direction, and the fourth rack 224 drives the top pressing part 42 to move left to separate the target case 8 and the expansion case 9, and until the slot connector of the target case 8 and the gold finger connector of the expansion case 9 are separated in the left-right direction, the expansion case 9 can be easily removed.

[0124] For the assisting device, the supporting part 41 is always located in the supporting hole 81 of the target case 8 in the process of separating the target case 8 and the expansion case 9, so that the target case 8 and the expansion case 9 have no relative displacement in the vertical direction, and the slot connector of the target case 8 and the gold finger connector of the expansion case 9 are also not subjected to force in the vertical direction. Therefore, the connectors are only subjected to force in the plugging direction when the target case 8 and the expansion case 9 are separated, and the overall force is uniform, the influence on the connectors during the separation process is small, and the connectors can be effectively prevented from failing.

[0125] In addition, in the state that the target case 8 and the expansion case 9 are docked, the supporting part 41 forms a mutual supporting relationship between the target case 8 and the expansion case 9, so that the connectors have no relative displacement when the target case 8 and the expansion case 9 are vibrated, and the connectors are not subjected to force, thereby reducing the influence on the connectors when the whole machine is vibrated.

[0126] When the target case 8 and the expansion case 9 need to be docked, the operation process is roughly the opposite of the above-mentioned operation process of separating the target case 8 from the expansion case 9. Specifically, the expansion case 9 is first moved to the left relative to the target case 8 to insert the support part 41 into the support hole 81 of the target case 8 from the right side of the target case 8, and to form a mutual supporting relationship between the target case 8 and the expansion case 9. At this time, the connectors on the target case 8 and the connectors on the expansion case 9 are only aligned, but not connected. When the support part 41 continues to be inserted into the support hole 81, the connectors on the target case 8 and the connectors on the expansion case 9 begin to dock, until the two connectors are docked and the target case 8 and the expansion case 9 are also docked, at which time the buckle part 51 is located on the left side of the buckle opening 82. Then, the driving member 3 is flipped to the horizontal position, at which time the limiting member 72 moves to the left end of the linear sliding groove 32. In this process, the driving member 3 drives the buckle member 5 to move upward through the second transmission module 22. Finally, the actuating mechanism 7 automatically moves to the right under the elastic force of the second elastic return member 62. In this process, the actuating mechanism 7 drives the pushing member 214 to move to the right through the first transmission module 21, and the buckle member 5 drives the buckle member 5 to move to the right with the pushing member 214 under the elastic force of the first elastic return member 61, so as to insert the buckle part 51 into the buckle opening 82 from the left, thereby realizing the self-locking of the target case 8 and the expansion case 9. At this time, the limiting member 72 moves back to the right end of the linear sliding groove 32, the support shaft 73 moves back to the right end of the limiting sliding hole 122, and the abutting sliding block 74 is again connected with the mounting seat 11 through the limiting structure 117.

[0127] The extraction aid device can realize the docking of the target case 8 and the expansion case 9 without the aid of other tools, is simple to operate, has high space utilization, and not only can make the ejector rod 4 inserted into the support hole 81 on the target case 8 when the target case 8 and the expansion case 9 with the extraction aid device are docked or separated, so as to form a mutual supporting relationship between the target case 8 and the expansion case 9, thereby avoiding damage to the connectors inside the target case 8 or the expansion case 9 caused by the gravity of the target case 8 or the expansion case 9. At the same time, the ejector rod 4 can also play a role in assisting the extraction when the target case 8 and the expansion case 9 are separated by cooperating with the driving member 3, thereby facilitating the disassembly of the target case 8 and the expansion case 9.

[0128] In a second aspect, an embodiment of the present application provides a combined case, which is shown in Figure 9 The combined case comprises a first case and an extraction aid device as in the first aspect. The case body 1 is fixedly connected with the first case, and the driving member 3 is exposed to the first case.

[0129] In the embodiment, the first case is the expansion case 9; the number of the pull-out assisting devices arranged in the first case is two, and the mounting seats 11 of the two pull-out assisting devices are respectively fixed on the top and the bottom of the first case through the cooperation of the screws and the mounting holes 118.

[0130] In combination with Figure 3 , Figure 4 and Figure 10 , the combined case further comprises: a second case. Two groups of buckle openings 82 and support holes 81 are formed on the second case. The positions of the buckle openings 82 and the support holes 81 on the second case are respectively matched with the positions of the buckle portions 51 and the top pressing portions 42 on the first case. In the embodiment, the second case is the target case 8.

[0131] The combined case can realize the quick docking and separation of the first case and the second case through the arrangement of the pull-out assisting devices, and avoid the damage of the gravity of the target case 8 or the expansion case 9 to the connectors inside the target case 8 or the expansion case 9 during the docking process.

[0132] In the description of the specification, the description referring to the terms "some embodiments", "other embodiments", "ideal embodiments", and the like means that the specific features, structures, materials, or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example.

[0133] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0134] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A traction-aiding device, characterized in that, include: Housing, transmission mechanism, drive components, fasteners, and push rod; The push rod is slidably connected to the housing, the drive component is movably connected to the housing, and the drive component is movably connected to the transmission mechanism; The transmission mechanism is used to drive the push rod to slide when the driving member rotates relative to the housing; The push rod is used to insert into the support hole on the target chassis to provide an upward support force to the target chassis, and to press against the target chassis when the drive unit moves relative to the housing, so that the target chassis moves away from the housing; The push rod includes a pressing part, which is connected to the transmission mechanism. The pressing part is used to press against the target chassis in a first linear direction when the drive member rotates relative to the housing, so that the target chassis moves in the first linear direction. The fastener is located on the side of the transmission mechanism opposite to the drive member, the fastener is movably connected to the housing, and the transmission mechanism is movably connected to the fastener; The fastener is used to be inserted into the fastening slot of the target chassis in a direction opposite to the first straight line, so as to lock the target chassis to the housing; The transmission mechanism is also used to drive the fastener to move toward the first linear direction so as to separate the fastener from the target chassis.

2. The assisted extraction device according to claim 1, characterized in that, The top rod further includes: a support portion, the support portion being located at one end of the top pressing portion facing the first straight direction, the driving member being pivotally connected to the housing along the second straight direction, the first straight direction being perpendicular to the second straight direction; The support portion is fixedly connected to the top pressing portion, the support portion and the top pressing portion are coaxial, and the cross-section of the support portion is smaller than the cross-section of the top pressing portion; The support portion is used to insert into the support hole along the first straight line direction to provide an upward supporting force to the target chassis.

3. The assisted extraction device according to claim 2, characterized in that, The assisted pulling device further includes: a first elastic reset element; The first elastic reset member is located on the side of the latching member facing the first straight direction. One end of the first elastic reset member is connected to the housing, and the other end of the first elastic reset member is connected to the latching member. The first elastic reset member is used to push the latching member to move away from the first straight line.

4. The assisted extraction device according to claim 2, characterized in that, The lifting aid device further includes: a prying mechanism; The transmission mechanism includes: a first transmission module and a second transmission module; The fasteners are slidably connected to the housing along the first straight direction and the third straight direction, respectively. The third straight direction is perpendicular to the first straight direction and the second straight direction, respectively. The actuating mechanism is connected to the first transmission module, and the driving component and the top pressing part are both connected to the second transmission module. The actuating mechanism is used to drive the buckle to move along the first linear direction via the first transmission module; The driving component is used to drive the top pressing part to slide in the first linear direction via the second transmission module, and to drive the buckling component to move in the third linear direction via the second transmission module.

5. The assisted extraction device according to claim 4, characterized in that, The assisted pulling device further includes: a second elastic reset element; The actuating mechanism is located on the side of the transmission mechanism opposite to the first straight line direction. The actuating mechanism is slidably connected to the housing along the first straight line direction. One end of the second elastic reset member is connected to the housing, and the other end of the second elastic reset member is connected to the actuating mechanism. The actuating mechanism is used to move along the first straight line direction to drive the buckle to move along the first straight line direction, and to move away from the first straight line direction to drive the buckle to move away from the first straight line direction. The second elastic reset member is used to push the actuating mechanism to move in a direction away from the first straight line.

6. The assisted extraction device according to claim 4, characterized in that, The assisted pulling device further includes: a third elastic reset element; One end of the third elastic reset member is connected to the housing, and the other end of the third elastic reset member is connected to the driving member. The third elastic reset member is used to apply a first force to the driving member to drive the driving member to rotate around the driving rotation direction, which is a direction of rotation around the second linear direction. The driving component is used to drive the top pressing part to slide along the first linear direction via the second transmission module when rotating along the driving rotation direction, and to drive the buckling component away from the buckling opening in the third linear direction via the second transmission module.

7. The assisted extraction device according to claim 6, characterized in that, The actuating mechanism includes: an actuating slider, a limiting member, a support shaft, and a pressing slider; The limiting member and the pressing slider are both located inside the housing. The limiting member is fixedly connected to the pressing slider. The housing has a limiting sliding hole along the first straight line direction. The support shaft passes through the limiting sliding hole and is fixedly connected to the toggle slider and the pressing slider respectively. The driving component has an arc-shaped sliding groove and a straight sliding groove arranged along the first straight direction. The arc-shaped sliding groove is located at one end of the straight sliding groove facing the first straight direction. The straight sliding groove is connected to the arc-shaped sliding groove. The limiting component is inserted into the straight sliding groove or the arc-shaped sliding groove and is slidably connected to the driving component. A limiting structure is provided on the housing, and the limiting structure is located at one end of the housing opposite to the first straight line direction; When the pressing slider is connected to the housing through the limiting structure, the limiting member is located in the linear groove, and the limiting member applies a second force to the driving member to overcome the first force. When the pressing slider disengages from the limiting structure, the limiting member moves into the arc-shaped groove, and the third elastic reset member drives the driving member to slide the top pressing part along the first straight line direction through the second transmission module and drive the buckling member away from the buckling opening in the third straight line direction.

8. The assisted extraction device according to claim 6, characterized in that, The first transmission module includes: a first rack, a first gear transmission unit, a second rack, and a pusher; The teeth on the first rack and the second rack are arranged along the first straight line direction. The first gear transmission unit includes at least one first gear. When there are multiple first gears, adjacent first gears mesh with each other. The first rack is fixedly connected to the actuating mechanism and meshes with the adjacent first gear. The second rack meshes with the adjacent first gear and is consistent with the transmission direction of the first rack. The pushing member is fixedly connected to the second rack. The pushing member is used to push the buckle to slide along the first straight line direction. The second transmission module includes: a rotating shaft, a third rack, a second gear transmission unit, a fourth rack, and a pressure component; The rotating shaft passes through the housing, the drive component, and the second gear transmission unit along the second straight line direction. The drive component and the second gear transmission unit are both rotatably connected to the housing via the rotating shaft. The teeth on the third rack are arranged along the third straight line direction. The third rack is located on the side of the second gear transmission unit facing the buckle. The third rack meshes with the second gear transmission unit and is slidably connected to the housing along the third straight line direction. The teeth on the fourth rack are arranged along the first straight line direction. The fourth rack meshes with the second gear transmission unit and is fixedly connected to the push rod. The driving member is used to drive the third rack to move along the third straight line direction and drive the fourth rack to move along the first straight line direction through the second gear transmission unit when rotating along the driving rotation direction. The pressing member is fixedly connected to the third rack, the pressing member is inserted into the fastening member along the first straight line direction, and the pressing member is used to drive the fastening member to slide along the third straight line direction; The second gear transmission unit includes an odd number of second gears arranged along the first straight line direction; when there are multiple second gears, the multiple second gears are arranged along the first straight line direction and mesh with each other, and the third rack and the fourth rack respectively mesh with the second gear farthest from the driving member.

9. A modular chassis comprising: The first chassis and the lifting aid device as described in any one of claims 1 to 8; The housing is fixedly connected to the first chassis, and the drive component is exposed outside the first chassis.

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