具体实施方式

如图1-2所示：本实施例的汽车用旋转式减震座椅骨架平台，包括底座1、上支撑架2和铰接连接形成的连杆机构3，所述连杆机构3可被驱动的在上下方向形变的铰接于底座1和上支撑架2之间，且连杆机构被施加向上形变的弹性预紧力；

连杆机构指的是由若干连杆相互铰接组成的组件，一般为X形铰接从而实现上下的形变，在此不再赘述；当然，连杆之间也可采用其他方位的铰接，比如直接的倾斜铰接，施加设定的弹性预紧力，也可以形成上下形变的结构，在此不再赘述；由于该结构全部配合副均采用铰接连接，去除了现有技术中的滑移副，从而解决了滑移副所存在的技术问题。

本实施例中，还包括阻尼器4，所述阻尼器4设置于底座1和上支撑架2之间形成上下方向的阻尼，阻尼器4属于现有技术中能够形成阻尼作用的机械结构，比如活塞式阻尼器等，在此不再赘述。

本实施例中，所述弹性预紧力可调，弹性预紧力一般指的是有弹性元件施加的力，能够实现往复弹性压缩以及释放，从而使得连杆机构3可上下往复形变完成减震，具有减震器的一般作用；可以是弹簧、弹片等，在此不再赘述。

本实施例中，所述连杆机构3包括连杆组件Ⅰ和连杆组件Ⅱ，所述连杆组件Ⅰ包括连杆Ⅰ301和与连杆Ⅰ301可在上下方向摆动的铰接的过渡连杆Ⅰ3011，所述连杆组件Ⅱ包括连杆Ⅱ302和与连杆Ⅱ302可在上下方向摆动的铰接的过渡连杆Ⅱ3021，所述连杆Ⅰ301和连杆Ⅱ302之间可在上下方向摆动的X形交叉铰接，连杆Ⅰ301的一端部和另一端部通过过渡连杆Ⅰ3011分别可在上下方向摆动的铰接于底座1和上支撑架2，所述连杆Ⅱ302的一端部和另一端部通过过渡连杆Ⅱ3021分别可在上下方向摆动的铰接于底座1和上支撑架2；如图所示，连杆Ⅰ301的一端部可直接铰接于所述底座，和另一端部通过过渡连杆Ⅰ3011铰接于上支撑架2，反之亦然；当然，所述连杆Ⅱ302的一端部可直接铰接于所述底座，另一端部通过过渡连杆Ⅱ3021铰接上支撑架2，反之亦然，在此不再赘述；本结构中，通过过渡连杆Ⅰ3011和过渡连杆Ⅱ3021使连杆Ⅰ301和连杆Ⅱ302与底座1和上支撑架2形成铰接连接，从而使连杆机构3在发生上下方向的形变时不会发生横向的变形，且结构较为简单；X形铰接指的是连杆Ⅰ301和连杆Ⅱ302交叉并铰接；本实用新型中所提及的铰接均指的是在上下方向摆动，当然期望是单自由度摆动，在此不再赘述。

本实施例中，所述连杆组件Ⅰ和连杆组件Ⅱ分别为两组且并列设置；如图所示，该结构中连杆Ⅰ301和过渡连杆Ⅰ3011以及连杆Ⅱ302和过渡连杆Ⅱ3021均为两个并在横向并列设置，具有较为稳定的形变和支撑，在此不再赘述。

本实施例中，所述弹性预紧力被施加在所述连杆机构3的任意的铰接位置，并在该铰接位置形成向上摆动趋势；铰接位置指的是连杆机构3与底座1和上支撑架2以及连杆机构3中所有的铰接连接的位置；弹性预紧力可被施加在任一处或几处铰接位置并且为使连杆机构形成向上摆动的趋势，均能实现实用新型的目的。

本实施例中，所述连杆Ⅰ301靠上的端部铰接于上支撑架2，上支撑架2需设置相应的铰接位置，属于通常的机械适应结构，在此不再赘述；所述连杆Ⅰ301靠下的端部通过过渡连杆Ⅰ3011铰接于底座1，同样，底座1需设置相应的铰接位置，属于通常的机械适应结构，在此不再赘述；且所述过渡连杆Ⅰ3011相对于连杆Ⅰ301形成向上的夹角，该结构中，能够保证过渡连杆Ⅰ3011与连杆Ⅰ301之间具有较充裕的摆动空间，且不占用上部空间，可用于布置其他功能部件；同理，所述连杆Ⅱ302靠上的端部通过过渡连杆Ⅱ3021铰接于上支撑架2，上支撑架2需设置相应的铰接位置，属于通常的机械适应结构，在此不再赘述；连杆Ⅱ302靠下的端部铰接于底座1，同样，底座1需设置相应的铰接位置，属于通常的机械适应结构，在此不再赘述；且所述过渡连杆Ⅱ3021相对于连杆Ⅱ302形成向上的夹角，当然，具备与连杆Ⅰ301和过渡连杆Ⅰ相同的效果，在此不再赘述。

本实施例中，所述连杆机构3还包括空心轴Ⅰ3012和空心轴Ⅱ3022，所述连杆Ⅰ301或过渡连杆Ⅰ3011通过空心轴3012铰接于所述底座1或上支撑架2，所述连杆Ⅱ302或过渡连杆Ⅱ3022通过空心轴Ⅱ3022铰接于底座1或上支撑架2，可以是上述铰接连接的任一连接结构的选择，均能实现实用新型目的，在此不再赘述；所述弹性预紧力由扭簧Ⅰ5和扭簧Ⅱ6施加，所述扭簧Ⅰ5穿设于空心轴Ⅰ3012内，一端抵在空心轴Ⅰ3012的设定部位，另一端抵在与其对应的相对固定的位置，铰接指的是空心轴(包括空心轴Ⅰ3012和空心轴Ⅱ3022)与底座或者上支撑架之间形成转动配合，从而使得连杆Ⅰ301、过渡连杆Ⅰ3011以及连杆Ⅱ302、过渡连杆Ⅱ3022能够与底座和上支撑架之间形成铰接；通过空心轴(包括空心轴Ⅰ3012和空心轴Ⅱ3022)形成铰接，能够提高铰接连接的强度，保证结构的耐久性，同时为扭簧(包括扭簧Ⅰ5和扭簧Ⅱ6)提供容纳空间，保证外部具有足够的功能空间以容纳其它部件，比如加热、通风的相关部件，在此不再赘述；

设定部位指的是在空心轴Ⅰ3012中设计相应的部位，能够抵住扭簧Ⅰ5的一端，比如开槽或设置凸起，属于一般的机械结构设定，在此不再赘述，同时，与其对应的相对固定的位置指的是与扭簧Ⅰ5的另一端所对应的且不参与转动的位置，比如是底座或者是上支撑架上设置的相应位置，比如卡槽或者凸起，用于抵住扭簧Ⅰ5的另一端，属于一般的机械结构设定，在此不再赘述；所述扭簧Ⅱ6穿设于空心轴Ⅱ3022内，一端抵在空心轴Ⅱ3022的设定部位，另一端抵在与其对应的相对固定的位置，该结构与空心轴Ⅰ3012原理相同，在此不再赘述；

所述扭簧Ⅰ5或/和扭簧Ⅱ6的弹力可调，使得所述弹性预紧力可调；弹力可调的方式具有多种，比如所述扭簧Ⅰ5和扭簧Ⅱ6择一的或者分别通过一个抵紧块抵紧一端部，而抵紧块可利用螺纹连接到相对于连杆机构的形变固定的位置即可，比如底座或者上支撑架，即可实现可调位置且可锁定，也可采用转动抵紧块改变位置并通过通常的机械结构锁紧即可，均属于通常的机械结构的应用，在此不再赘述。

本实施例中，所述底座1和上支撑架2均为框架式结构，框架式结构指的是具有两侧边和前边以及后边组成的框架结构，通常是矩形或者近似矩形结构，在此不再赘述；所述空心轴Ⅰ3012转动配合支撑在上支撑架2靠后的位置，可以是铰接于后边，也可以是两侧边对应的位置，在此不再赘述；所述连杆Ⅰ301靠上的端部固定于所述空心轴Ⅰ3012，所述过渡连杆Ⅰ3011铰接于所述底座1对应的侧边102，如图所示，所述底座1的两个侧边102分别设有铰接耳，两个所述过渡连杆Ⅰ3011分别对应铰接于两个侧边102的铰接耳，结构简单紧凑，易于安装；所述空心轴Ⅱ3022转动配合支撑在上支撑架2靠前的位置，可以是铰接于前边，也可以是两侧边对应的位置，在此不再赘述；所述过渡连杆Ⅱ3021固定于所述空心轴Ⅱ3022，固定方式可以是焊接等现有的机械固定连接方式，所述连杆Ⅱ302靠下的端部铰接于所述底座1对应的侧边，如图所示，所述底座1的两个侧边102分别设有铰接耳，两个所述连杆Ⅱ302分别对应铰接于两个侧边102的铰接耳，属于通常的机械铰接结构，在此不在赘述；所述阻尼器4安装于底座1的前边和上支撑架2的前边之间在底座与上支撑架之间形成阻尼，阻尼器安装在靠前的位置，使得本实用新型在中后部具有较大的应用空间，且适应于人体工学的需求，阻尼器的安装一般采用上端铰接于上支撑架2的前边，下端铰接于底座1的前边的结构，需要配合以铰接耳等结构，在此不再赘述。

本实施例中，所述上支撑架2的后边201设有用于转动支撑所述空心轴Ⅰ的后支耳2021，所述扭簧Ⅰ5穿入空心轴Ⅰ3012，一承力端抵在空心轴Ⅰ3012的壁上开设的限位槽上，另一承力端延伸出空心轴Ⅰ3012并抵在所述后支耳；如图所示，空心轴Ⅰ3012上开设有沿轴向的条形槽即限位槽，扭簧Ⅰ5一承力端被弯折成限位部，并在穿入空心轴Ⅰ3012后被自身弹性嵌合于限位槽，从而形成圆周方向上的限位，如图所示，后支耳2021上对应形成翻边，并通过该翻边抵住扭簧Ⅰ5的另一承力端，从而实现对空心轴Ⅰ3012转动预紧力的施加，该转动预紧力使得空心轴Ⅰ3012具有带动连杆301向上摆动的趋势，从而形成减震结构；

连杆机构3还包括设置于上支撑架2的弹簧力调节机构7，所述空心轴Ⅱ3022转动配合支撑在上支撑架2两个侧边203之间，所述扭簧Ⅱ6穿入空心轴Ⅱ3022，一承力端抵在空心轴Ⅱ3022的壁上开设的限位槽上，该结构与扭簧Ⅰ5安装于空心轴Ⅰ3012的结构类似，在此不再赘述；所述扭簧Ⅱ6另一承力端延伸出空心轴Ⅱ与弹簧力调节机构的调节端相抵；弹簧力调节机构7的结构采用现有的机械结构，调节端即为前述的抵紧块；如图所示，弹簧力调节机构7安装在上支撑架2的对应的侧边203上，包括旋钮701(一般为手动，也可以是电动)、传动机构702和调节端703，调节端一般为条形块状，传动机构702具有一转动输出轴，调节端702安装在动力输出轴并可被驱动的该轴的轴线摆动，在摆动的过程中抵紧所述扭簧Ⅱ6另一承力端，使其改变位置从而达到调节弹性力的目的，最终调整减震效果，在此不再赘述；传动机构702一般采用被驱动转动并具备自锁能力的的机械结构，比如棘轮棘爪结构，但要配以反向释放结构(比如可插在不同位置的插销)、具有自锁角的蜗轮蜗杆结构，即通过旋钮传动至调节端并能使其摆动的结构，通过通常的机械结构即可实现，在此不再赘述；如图所示，调节端位于上支撑架2的对应的侧边203的内侧，扭簧Ⅱ6另一承力端穿出空心轴Ⅱ3022后回弯并穿过对应的侧边203上开设的弧形通槽2031后抵住调节端703，整体结构简单紧凑，调节端位于侧边203的内侧，避免被干扰从而保证调节的准确性。

本实施例中，两组连杆组件Ⅱ的所述连杆Ⅱ302的端部之间固定连接一铰接轴3023，并通过所述铰接轴3023铰接支撑于所述所述底座1的两侧边103之间，两侧边103对应的设有铰接耳，属于铰接连接的通常结构，具有较高的整体强度，在此不再赘述。

从结构上看，上支撑架2的后边201为轴状结构，用于支撑并铰接空心轴Ⅰ3012的后支耳固定在轴状结构的后边201上并向下延伸，保证了整体的支撑强度；同时，前边202以及侧边203的横截面为槽形结构，类似于槽钢结构，用于支撑阻尼器以及其他铰接结构均能保证整体强度，在此不再赘述；

底座1上用于与铰接轴3023和过渡连杆3011形成铰接连接的位置均一体成形(钣金)形成铰接耳，从而保证铰接位置的承载能力，保证整个骨架的稳定性。

最后说明的是，以上实施例仅用以说明本实用新型的技术方案而非限制，尽管参照较佳实施例对本实用新型进行了详细说明，本领域的普通技术人员应当理解，可以对本实用新型的技术方案进行修改或者等同替换，而不脱离本实用新型技术方案的宗旨和范围，其均应涵盖在本实用新型的权利要求范围当中。

Specific embodiments

As shown in Figures 1-2: The automotive rotary shock-absorbing seat frame platform in this embodiment includes a base 1, an upper support frame 2, and a linkage mechanism 3 hinged together. The linkage mechanism 3 can be driven to deform vertically and hinged between the base 1 and the upper support frame 2, and an upward-deforming elastic preload is applied;

A connecting rod mechanism refers to a component composed of several connecting rods hinged to each other, generally using an X-shaped hinge to achieve vertical deformation, which will not be elaborated here; Of course, hinges in other directions can also be used between connecting rods, such as direct inclined hinges and applying a set elastic preload, which can also form vertical deformation structures, which will not be elaborated here; Since all fitting pairs of this structure use articulated connections, the sliding pair from the prior art has been removed, thereby solving the technical problems of the sliding pair.

In this embodiment, a damper 4 is also included, which is arranged between the base 1 and the upper support frame 2 to form a vertical damping motion. The damper 4 belongs to a mechanical structure in the prior art capable of damping effects, such as a piston-type damper, which will not be repeated here.

In this embodiment, the elastic preload is adjustable. Generally, the elastic preload refers to the force applied by elastic elements, which can achieve reciprocating elastic compression and release, thereby enabling the linkage mechanism 3 to deform vertically and reciprocately to achieve shock absorption, and serves the general function of a shock absorber; It can be springs, spring clips, etc., which will not be repeated here.

In this embodiment, the linkage mechanism 3 includes a linkage assembly I and a linkage assembly II. The linkage assembly I includes a connecting rod I.301 and a transition linkage I.3011 hinged to the connecting rod I.301 that can swing in the vertical direction. The linkage assembly II includes a linkage II III302 and a transition rod II 3021 that can swing vertically with the linkage II. The X-shaped cross-hinged connecting rod I.301 and the connecting rod II.302 can swing vertically. One end and the other end of connecting rod I301 can be hinged to the base 1 and the upper support frame 2 by swinging vertically via the transition connecting rod I3011. One end and the other end of the connecting rod II.302 can be hinged to the base 1 and the upper support frame 2 by swinging vertically via the transition connecting rod II.3021; As shown in the figure, one end of connecting rod I.301 can be directly hinged to the base, and the other end is hinged to the upper support frame 2 via the transition connecting rod I.3011, and vice versa; Of course, one end of the connecting rod II.302 can be directly hinged to the base, and the other end is hinged onto the support frame 2 via the transition connecting rod II.3021, and vice versa, which will not be repeated here; In this structure, the transition rods I.3011 and II.3021 are hinged to the base 1 and the upper support frame 2 through transition linkages I.3011 and II.302, so that the linkage mechanism 3 does not deform transversely during vertical deformation, and the structure is relatively simple; X-shaped hinge refers to crossing and hinging connecting rod I301 and connecting rod II.302; The hinge mentioned in this utility model refers to oscillation in the vertical direction, with the expectation of single degrees of freedom swing, which will not be repeated here.

In this embodiment, the linkage assembly I and the connecting rod assembly II are arranged in two sets and arranged side by side; As shown in the figure, in this structure, connecting rod I.301 and transition linkage I.3011, as well as connecting rod II.302 and transition connecting rod II.3021, are all arranged in two parallel transverse lines, providing relatively stable deformation and support, which will not be repeated here.

In this embodiment, the elastic preload is applied to any hinge position of the linkage mechanism 3, forming an upward swinging trend at this hinge position; The hinge position refers to the position where all hinges are connected between the linkage mechanism 3 and the base 1, the upper support frame 2, and the linkage mechanism 3; Elastic preload can be applied at any or more hinge positions and to create an upward swing tendency for the linkage mechanism, both of which achieve the purpose of the utility model.

In this embodiment, the upper end of the connecting rod I.301 is hinged to the upper support frame 2, which requires the corresponding hinge position and is a typical mechanical adaptation structure that will not be repeated here; The lower end of connecting rod I.301 is hinged to base 1 via transition connecting rod I.3011. Similarly, base 1 requires corresponding hinge positions, which is a typical mechanical adaptation structure and will not be repeated here; Moreover, the transition connecting rod I3011 forms an upward angle with the connecting rod I.301, ensuring ample swinging space between the transition connecting rod I.3011 and the connecting rod I.301 without occupying upper space, allowing it to be used to arrange other functional components; Similarly, the upper end of the connecting rod II.302 is hinged to the upper support frame 2 via the transition connecting rod II.3021. The upper support frame 2 requires the corresponding hinge position, which is a typical mechanical adaptation structure and will not be repeated here; The lower end of the connecting rod II.302 is hinged to base 1. Similarly, base 1 requires the corresponding hinge position, which is a typical mechanical adaptation structure and will not be elaborated here; Moreover, the transition linkage II.3021 forms an upward angle with the connecting rod II.302, which of course has the same effect as the connecting rod I.301 and transition linkage I, so it will not be repeated here.

In this embodiment, the linkage mechanism 3 further includes a hollow shaft I.3012 and a hollow shaft II.3022. The linkage I.301 or transition linkage I.3011 is hinged to the base 1 or the upper support frame 2 via the hollow shaft 3012, and the connecting rod II.3022 or the transition linkage II.3022 is hinged to the base 1 or the upper support frame 2 via the hollow shaft II.3022. Any of the above hinged connection structures can be chosen, and the purpose of the utility model can be achieved. The elastic preload is applied by torsion spring I5 and torsion spring II.6. The torsion spring I.5 is inserted through hollow shaft I.3012, with one end pressed against the set position of hollow shaft I.3012 and the other end at a relatively fixed position. Hinge refers to the rotational fit between the hollow shaft (including hollow shaft I.3012 and hollow shaft II.3022) and the base or upper support frame, thereby enabling the connecting rod I.301, the transition connecting rod I.3011, and the connecting rod II.302, The transition connecting rod II.3022 can form a hinge between the base and the upper support frame; By forming a hinge through hollow shafts (including hollow shaft I.3012 and hollow shaft II.3022), the strength of the hinge connection can be improved, ensuring structural durability, while also providing space for the torsion springs (including torsion springs I.5 and II.6), ensuring there is sufficient functional space to accommodate other components, such as heating and ventilation parts, which will not be repeated here;

The setting part refers to the corresponding part designed in hollow shaft I.3012 that can support one end of the torsion spring I.5, such as by grooving or protruding parts. This is a general mechanical structure setting and will not be repeated here. At the same time, the corresponding relatively fixed position refers to the position corresponding to the other end of the torsion spring I.5 and does not participate in rotation, such as the corresponding position on the base or upper support frame, such as a slot or protrusion, used to press against the other end of the torsion spring I.5, which is a general mechanical structure design. I won't repeat them here; The torsion spring II.6 is inserted inside the hollow shaft II.3022, with one end pressed against the set position of the hollow shaft II.3022 and the other end at a corresponding relatively fixed position. This structure is based on the same principle as the hollow shaft I.3012 and will not be repeated here;

The elastic force of torsion spring I.5 and/or torsion spring II 6 is adjustable, making the elastic preload adjustable; There are various ways to adjust the elastic force. For example, torsion spring I.5 and torsion spring II.6 can be either selectively used or each is pressed against one end by a pressing block. The pressing block can be connected by threads to a deformation fixed position relative to the linkage mechanism, such as the base or upper support frame, which can achieve adjustable and lockable positions. Alternatively, rotating the pressing block can change position and lock it using conventional mechanical structures. All are typical mechanical structural applications and will not be elaborated here.

In this embodiment, both the base 1 and the upper support frame 2 are frame-type structures. A frame-type structure refers to a frame structure composed of two side edges, a front edge, and a rear edge, usually rectangular or nearly rectangular, and will not be repeated here; The hollow shaft I.3012 rotatably fits and supports the rear position of the upper support frame 2, which can be hinged at the rear or at the corresponding positions on both side edges, and will not be repeated here; The upper end of connecting rod I.301 is fixed to the hollow shaft I.3012, and the transition linkage I.3011 is hinged to the side 102 corresponding to the base 1. As shown in the figure, the two side edges 102 of the base 1 are respectively provided with hinge lugs, and the two transition connecting rods I.3011 are respectively hinged to the two side ends 102. The structure is simple, compact, and easy to install; The position of the hollow shaft II.3022 rotatably fitted to the front of the upper support frame 2 may be hinged to the front or to the corresponding positions on both side edges, which will not be repeated here; The transition connecting rod II.3021 is fixed to the hollow shaft II.3022 and can be fixed by existing mechanical fixing methods such as welding. The lower end of the connecting rod II.302 is hinged to the side of the base 1, as shown in the figure. The two side edges 102 of the base 1 are each equipped with hinge lugs, and the two connecting rods II.302 are hinged to the two side ends 102, which belong to a typical mechanical hinge structure and will not be elaborated here; The damper 4 is installed between the front edge of base 1 and the front edge of the upper support frame 2, forming a damper between the base and the upper support frame. The damper is installed in a front position, giving the utility model considerable application space in the middle and rear sections and adapting to ergonomic requirements. The damper installation generally adopts a structure where the upper end hinges the front of the upper support frame 2 and the lower end hinges the front of base 1, requiring hinge lugs and other structures, which will not be repeated here.

In this embodiment, the rear 201 of the upper support frame 2 is provided with a rear support lug 2021 for rotatably supporting the hollow shaft I. The torsion spring I5 passes into the hollow shaft I3012, with one load-bearing end pressing against the limiting groove formed on the wall of hollow shaft I3012, and another load-bearing end extending out from hollow shaft I3012 and pressing against the rear support ear; As shown in the figure, a strip-shaped groove is formed along the axis on hollow shaft I.3012, i.e., a limiting groove. One load-bearing end of torsion spring I.5 is bent into a limiting section, and after passing through hollow shaft I.3012, it is elastically fitted into the limiting groove, thereby forming a limiting position in the circumferential direction. As shown in the figure, a flange is formed on the rear support ear 2021, which presses against the other load-bearing end of torsion spring I.5, thereby applying rotational preload on hollow shaft I.3012. This rotational preload causes the hollow shaft I.3012 to drive the connecting rod 301 to swing upward, thereby forming a shock-absorbing structure;

The linkage mechanism 3 further includes a spring force adjustment mechanism 7 arranged on the upper support frame 2. The hollow shaft II.3022 rotatably fits and supports between the two sides 203 of the upper support frame 2. The torsion spring II.6 passes into the hollow shaft II.3022, with a load-bearing end pressed against a limiting groove formed on the wall of the hollow shaft II.3022. This structure is similar to the structure of the torsion spring I.5 installed on the hollow shaft I.3012 and will not be elaborated here; The other bearing end of torsion spring II.6 extends out from the hollow shaft II, which abuts the adjustment end of the spring force adjustment mechanism; The structure of the spring force adjustment mechanism 7 adopts an existing mechanical structure, with the adjustment end serving as the aforementioned pressing block; As shown in the figure, the spring force adjustment mechanism 7 is installed on the corresponding side 203 of the upper support frame 2, including a knob 701 (generally manual, but can also be electric), a transmission mechanism 702, and an adjustment end 703. The adjustment end is generally a strip-shaped block. The transmission mechanism 702 has a rotating output shaft, which is installed on the power output shaft and can be driven to swing along the shaft's axis. During the swing, it presses against the other bearing end of torsion spring II.6, changing its position to achieve the purpose of adjusting elastic force. The final adjustment to the shock absorption effect will not be repeated here; The transmission mechanism 702 generally adopts a mechanical structure that is driven to rotate and has self-locking capability, such as a ratchet pawl structure, but it must be paired with a reverse release mechanism (such as a pin that can be inserted at different positions) and a worm gear structure with a self-locking angle, meaning it is transmitted to the adjustment end via a knob and can swing. This can be achieved through conventional mechanical structures and will not be repeated here; As shown in the figure, the adjustment end is located on the inner side of the corresponding side 203 of the upper support frame 2. The other load-bearing end of torsion spring II.6 passes through the hollow shaft II.3022, then curves backward, passes through the arc-shaped slot 2031 provided on the corresponding side 203, and then presses against the adjustment end 703. The overall structure is simple and compact, with the adjustment end located on the inner side of side 203 to avoid interference and ensure adjustment accuracy.

In this embodiment, a hinge shaft 3023 is fixedly connected between the ends of the two sets of linkage assemblies II, and is hinged and supported between the two side edges 103 of the base 1 via the hinge shaft 3023. The two side edges 103 are equipped with hinge lugs, which is a typical hinged connection structure with high overall strength, which will not be repeated here.

Structurally, the rear 201 of the upper support frame 2 is an axial structure, and the rear support lugs for supporting and hinging hollow shaft I.3012 are fixed to the rear 201 of the shaft-shaped structure and extend downward, ensuring overall support strength; At the same time, the cross-sections of the front 202 and side 203 are groove-shaped structures, similar to channel steel structures, used to support the damper and other hinged structures to ensure overall strength, so they will not be elaborated here;

The hinged connection points on base 1 to the articulated shaft 3023 and transition connecting rod 3011 are integrally formed (sheet metal) to form hinge lugs, thereby ensuring the load-bearing capacity of the hinge positions and guaranteeing the stability of the entire framework.

Finally, it should be noted that the above embodiments are only intended to illustrate the technical solutions of the present utility model and not to limit them. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions of the technical solutions of this utility model can be made without departing from the purpose and scope of the technical solutions of this utility model, and all such actions should be included within the scope of the claims of the present utility model.