Height-adjustable support

Abstract

The utility model provides a height-adjustable support and relates to the technical field of supports. The support comprises an upper support unit, a spherical crown unit, a middle support unit, a height adjusting unit and a lower support unit, the upper support unit is in sliding contact with the top of the spherical crown unit, the spherical crown unit is in sliding contact with the top of the middle support unit, and the outer side face of the middle support unit is in sliding contact with the inner side face of the lower support unit. The top of the height adjusting unit is in sliding contact with the bottom of the middle support unit, and the bottom of the height adjusting unit is in sliding contact with the lower support unit. According to the height-adjustable support, new parts do not need to be added or replaced, the middle support unit, the spherical crown unit and the upper support unit can be driven to move in the vertical direction together only through the parts of the height adjusting unit, the bidirectional height adjusting function of upward height adjusting and downward height adjusting is achieved, construction is more convenient, the project amount is effectively reduced, and the construction efficiency is improved. And meanwhile, the construction time is also saved.

Description

Technical Field

[0001] The utility model relates to the technical field of supports, in particular to a height-adjustable support. Background Art

[0002] Bearings are the connecting devices between bridge beams and piers. They transmit bridge loads to the pier tops and reliably transmit the reaction forces and deformations of the bridge's superstructure to its substructure. After a bridge is built, piers can settle over time due to varying geological conditions. Furthermore, factors such as construction errors can redistribute internal forces within the bridge structure, resulting in uneven forces on the four-point support bearings, potentially leading to unpredictable accidents. Therefore, bearings with height adjustment technology are required to maintain bridge stability and ensure proper operation.

[0003] Currently, the most common and practical method for adjusting height is to add steel pads between the supports and the beam or pier. However, this requires machining the corresponding steel plates according to the required height adjustment. Before adjustment, a jack must be set up to lift the beam, then the support height is adjusted by adding the machined steel plates, and finally the jack must be lowered. Each adjustment requires the replacement of high-strength bolts used for anchoring. This adjustment process is cumbersome and can only achieve upward adjustment, resulting in a large, time-consuming, and costly process. Furthermore, due to limitations such as the thickness and machining accuracy of the steel plates, adjustments are generally made in integer multiples, making it impossible to achieve higher precision height adjustments.

[0004] The applicant has discovered that there are at least the following technical problems in the prior art: when using the existing adjustable height support, it is usually necessary to add or replace new parts, which is relatively cumbersome to construct, with a high workload and a waste of construction time. Utility Model Content

[0005] The present invention aims to provide an adjustable height support to address the technical problem in the prior art that adjustable height supports often require the addition or replacement of new components during use, resulting in cumbersome construction, high engineering workload, and a waste of construction time. The various technical effects of the preferred technical solution among the various technical solutions provided by the present invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A height-adjustable support comprises an upper support unit, a spherical cap unit, a middle support unit, a height-adjusting unit and a lower support unit, wherein the upper support unit is in sliding contact with the top of the spherical cap unit, the spherical cap unit is in sliding contact with the top of the middle support unit, the outer side surface of the middle support unit is in sliding contact with the inner side surface of the lower support unit, the top of the height-adjusting unit is in sliding contact with the bottom of the middle support unit and the bottom of the height-adjusting unit is in sliding contact with the lower support unit, the height-adjusting unit can drive the middle support unit to move in a vertical direction relative to the lower support unit, and the upper support unit and the spherical cap unit can move synchronously in the vertical direction following the middle support unit.

[0008] Preferably, the height adjustment unit includes a height adjustment slider and an adjustment component, the middle support unit includes a middle support plate, and the lower support unit includes a lower support plate. The bottom of the middle support plate and the top of the height adjustment slider are both inclined and parallel to each other. The top of the height adjustment slider is in sliding contact with the bottom of the middle support plate, and the bottom of the height adjustment slider is in sliding contact with the lower support plate. The adjustment component is movably connected to the height adjustment slider, and the adjustment component can drive the height adjustment slider to move in the horizontal direction relative to the lower support plate, and the height adjustment slider can drive the middle support plate to move in the vertical direction while moving.

[0009] Preferably, the upper support unit includes an upper support plate and a planar slide, the planar slide is connected to the bottom of the upper support plate, the spherical cap unit includes a spherical cap lining and a planar wear-resistant plate, the planar wear-resistant plate is embedded in the top of the spherical cap lining, and the bottom of the planar slide is in sliding contact with the top of the planar wear-resistant plate.

[0010] Preferably, the spherical crown unit also includes a spherical skateboard, which is connected to the bottom of the spherical crown lining plate. The middle support unit also includes a spherical wear-resistant plate, which is embedded in the top of the middle support plate. The bottom of the spherical skateboard is in sliding contact with the top of the spherical wear-resistant plate.

[0011] Preferably, the adjustment assembly includes an adjustment screw and an adjustment nut, the adjustment screw is connected to the height adjustment slider and its two ends respectively pass through both sides of the lower support plate, and the two adjustment nuts are each threadedly connected to one end of the adjustment screw.

[0012] Preferably, a guide rail groove is provided on the bottom inclined surface of the middle support plate, and the middle support unit also includes a middle support slide plate, which is connected to the bottom of the middle support plate and the inner side wall of the guide rail groove. The height adjustment unit also includes a guide rail, a guide rail slide and a slider inclined wear-resistant plate. The guide rail is connected to the top of the height adjustment slider and corresponds to the guide rail groove, the guide rail slide is respectively connected to both sides of the guide rail, the slider inclined wear-resistant plate is connected to the top inclined surface of the height adjustment slider, and the middle support slide plate is in sliding contact with the slider inclined wear-resistant plate and the guide rail slide bar respectively.

[0013] Preferably, the adjustment assembly includes an adjustment rocker and a bearing structure, the adjustment rocker is threadedly connected to the lower support plate, the bearing seat of the bearing structure is connected to the height adjustment slider, one end of the adjustment rocker is movably connected to the bearing structure and the other end is located on the outside of the lower support plate.

[0014] Preferably, the height adjustment unit also includes a slider plane wear-resistant plate, which is embedded in the bottom of the height adjustment slider, and the lower support unit also includes a sliding plane plate, which is connected to the top of the lower support plate, and the bottom of the slider plane wear-resistant plate is in sliding contact with the top of the sliding plane plate.

[0015] Preferably, the top outer edge of the middle support plate extends outward to form a protrusion, and the lower support unit also includes a stabilizing bolt, which is movably connected to the top of the lower support plate. The stabilizing bolt can adjust the relative distance between its top and the top surface of the lower support plate so that its top can contact the bottom surface of the protrusion and form support.

[0016] Preferably, a dustproof component is further included, which is connected to the bottom of the upper support plate and is located on the outer side of the lower support plate.

[0017] The beneficial effects of the utility model are as follows: the upper support unit is in sliding contact with the top of the spherical cap unit, which can realize the horizontal displacement function of the support in normal design;

[0018] The spherical cap unit is in sliding contact with the top of the middle support unit, which can realize the corner function of the normal design of the support;

[0019] The top of the height adjustment unit is in sliding contact with the bottom of the middle support unit, the bottom of the height adjustment unit is in sliding contact with the lower support unit, the outer side of the middle support unit is in sliding contact with the inner side of the lower support unit, and the inner side of the lower support unit can form a guiding effect on the middle support unit, so that the middle support unit can only move in the vertical direction relative to the lower support unit;

[0020] The height adjustment unit can drive the middle support unit to move in the vertical direction relative to the lower support unit, and the upper support unit and the spherical cap unit can move synchronously with the middle support unit in the vertical direction;

[0021] The adjustable height support does not require adding or replacing new components. The middle support unit, spherical crown unit and upper support unit can be driven to move together in the vertical direction through the components of the height adjustment unit itself, realizing a two-way height adjustment function of raising and lowering. The construction is more convenient, effectively reducing the amount of work and saving construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a cross-sectional structural diagram of the first embodiment of the present invention from a front view perspective;

[0024] Figure 2 This is a cross-sectional structural diagram of the first embodiment of the present invention from a side view;

[0025] Figure 3 This is a cross-sectional structural diagram of the first embodiment of the present invention from a top view;

[0026] Figure 4 This is a cross-sectional structural diagram of the second embodiment of the present invention from a front view perspective;

[0027] Figure 5 This is a cross-sectional structural diagram of the second embodiment of the present invention from a side view;

[0028] Figure 6 This is a cross-sectional structural diagram of the second embodiment of the present invention from a top view;

[0029] Figure 7 This is a cross-sectional structural diagram of the third embodiment of the present invention from a front view perspective;

[0030] In the figure, 1 is the upper support unit; 11 is the upper support plate; 12 is the flat slide plate;

[0031] 2. Ball crown unit; 21. Ball crown lining; 22. Flat wear plate; 23. Spherical slide plate;

[0032] 3. Middle support unit; 31. Middle support plate; 311. Guide rail groove; 312. Protrusion; 32. Spherical wear-resistant plate; 33. Middle support slide plate;

[0033] 4. Height adjustment unit; 41. Height adjustment slider; 42. Adjustment assembly; 421. Adjustment screw; 422. Adjustment nut; 423. Adjustment rocker; 424. Bearing structure; 43. Guide rail; 44. Guide rail slide; 45. Slider slope wear plate; 46. Slider flat wear plate;

[0034] 5. Lower support unit; 51. Lower support plate; 52. Sliding plane plate; 53. Stabilizing bolt;

[0035] 6. Dustproof components. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "lateral", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model depending on the specific circumstances.

[0039] Example 1

[0040] Reference Figures 1 to 3 , this embodiment provides an adjustable height support, including an upper support unit 1, a spherical cap unit 2, a middle support unit 3, a height adjustment unit 4 and a lower support unit 5;

[0041] The upper support unit 1 is in sliding contact with the top of the spherical cap unit 2, and a sliding surface is formed between the two, so that the horizontal displacement function of the support can be realized;

[0042] The spherical cap unit 2 is in sliding contact with the top of the middle support unit 3, and a rotation surface is formed between the two, so that the rotation function of the support in normal design can be realized;

[0043] The top of the height adjustment unit 4 is in sliding contact with the bottom of the middle support unit 3, forming a sliding surface therebetween. The bottom of the height adjustment unit 4 is in sliding contact with the lower support unit 5, forming a sliding surface therebetween. The outer side surface of the middle support unit 3 is in sliding contact with the inner side surface of the lower support unit 5. The inner side surface of the lower support unit 5 can guide the middle support unit 3, so that the middle support unit 3 can only move in the vertical direction relative to the lower support unit 5.

[0044] The height adjustment unit 4 can drive the middle support unit 3 to move in the vertical direction relative to the lower support unit 5, and the upper support unit 1 and the spherical cap unit 2 can move synchronously with the middle support unit 3 in the vertical direction;

[0045] The adjustable height support does not require adding or replacing new components. The middle support unit 3, the spherical crown unit 2 and the upper support unit 1 can be driven by the components of the height adjustment unit 4 itself to move together in the vertical direction, thereby realizing a two-way height adjustment function of raising the height upward and lowering the height downward. The construction is more convenient, the engineering workload is effectively reduced, and the construction time is also saved.

[0046] As an optional embodiment, the height adjustment unit 4 includes a height adjustment slider 41 and an adjustment assembly 42, the middle support unit 3 includes a middle support plate 31, and the lower support unit 5 includes a lower support plate 51;

[0047] The top of the height adjustment slider 41 is in sliding contact with the bottom of the middle support plate 31 , and the bottom of the height adjustment slider 41 is in sliding contact with the lower support plate 51 ;

[0048] The adjustment component 42 is movably connected to the height adjustment slider 41, and the adjustment component 42 can drive the height adjustment slider 41 to move horizontally relative to the lower support plate 51;

[0049] Since the bottom of the middle support plate 31 and the top of the height adjustment slider 41 are both inclined and parallel to each other, during the horizontal movement of the height adjustment slider 41, the position change of the height adjustment slider 41 can be converted into a height change of the middle support plate 31. The height adjustment slider 41 can drive the middle support plate 31 to move in the vertical direction while moving. The relative displacement of the inclined surface can realize a stepless height adjustment function, and it is a two-way height adjustment function of raising and lowering.

[0050] As an optional embodiment, the upper support unit 1 includes an upper support plate 11 and a planar slide 12, and the planar slide 12 is connected to the bottom of the upper support plate 11, and the connection here is preferably a welding connection to make the connection firm and improve the strength;

[0051] The spherical cap unit 2 includes a spherical cap lining plate 21 and a flat wear-resistant plate 22. The flat wear-resistant plate 22 is embedded in the top of the spherical cap lining plate 21. Here, preferably, a fixing groove is opened on the top of the spherical cap lining plate 21, and the flat wear-resistant plate 22 is embedded in the fixing groove.

[0052] The bottom of the planar slide plate 12 is in sliding contact with the top of the planar wear-resistant plate 22. With this arrangement, the planar slide plate 12 and the planar wear-resistant plate 22 can form a sliding surface, which can realize the horizontal displacement function of the normal design of the support.

[0053] As an optional embodiment, the spherical cap unit 2 further includes a spherical slide 23, which is connected to the bottom of the spherical cap lining 21. The connection here is preferably a welding connection to ensure a firm connection and improve strength.

[0054] The middle support unit 3 further includes a spherical wear-resistant plate 32, which is embedded in the top of the middle support plate 31. Here, preferably, a fixing groove is opened on the top of the middle support plate 31, and the spherical wear-resistant plate 32 is embedded in the fixing groove;

[0055] The bottom of the spherical slide plate 23 is in sliding contact with the top of the spherical wear-resistant plate 32. With this arrangement, the spherical slide plate 23 and the spherical wear-resistant plate 32 can form a rotating surface, which can realize the normal rotation function of the support.

[0056] As an optional embodiment, the adjustment assembly 42 includes an adjustment screw 421 and an adjustment nut 422. The adjustment screw 421 is connected to the height adjustment slider 41 and its two ends extend from both sides of the lower support plate 51. Two adjustment nuts 422 are each threadedly connected to one end of the adjustment screw 421.

[0057] During use, by rotating the adjusting nut 422, the adjusting screw 421 can be driven to move along its length direction. When the adjusting screw 421 moves, it can also drive the height adjustment slider 41 to move synchronously. The position change of the height adjustment slider 41 can be converted into a height change of the middle support plate 31. When the height adjustment slider 41 moves, it can drive the middle support plate 31 to move in the vertical direction, and stepless height adjustment can be achieved through the relative displacement of the inclined surface.

[0058] As an optional embodiment, a guide rail groove 311 is opened on the bottom inclined surface of the middle support plate 31, and the middle support unit 3 further includes a middle support slide plate 33, which is connected to the bottom of the middle support plate 31 and the inner side wall of the guide rail groove 311;

[0059] The height adjustment unit 4 further includes a guide rail 43, a guide rail slide 44, and a slider bevel wear plate 45. The guide rail 43 is connected to the top of the height adjustment slider 41 by bolts and corresponds to the guide rail groove 311. The guide rail slide 44 is connected to both sides of the guide rail 43. The slider bevel wear plate 45 is connected to the top bevel of the height adjustment slider 41.

[0060] The middle support slide plate 33 is in sliding contact with the slider bevel wear-resistant plate 45 and the guide rail slide bar 44 respectively. The guide rail 43 can play a displacement guide role during sliding and can limit the lateral displacement of the middle support plate 31.

[0061] As an optional embodiment, the lower support plate 51 preferably includes a flat plate located at the bottom, and two blocks are symmetrically arranged on the top of the flat plate. The shape of the two blocks is preferably a flat plate structure. When adjusting the height, the two blocks can guide the middle support plate 31 upward and downward, and cooperate with the guide rail 43 to fix the position of the middle support plate 31.

[0062] As an optional embodiment, the height adjustment unit 4 further includes a slider flat wear plate 46 , which is embedded in the bottom of the height adjustment slider 41 ;

[0063] The lower support unit 5 further includes a sliding plane plate 52, which is connected to the top of the lower support plate 51. The connection here is preferably welded to ensure a firm connection and improve strength.

[0064] The bottom of the slider flat wear plate 46 is in sliding contact with the top of the sliding flat plate 52 , so that the height adjustment slider 41 and the lower support plate 51 can move relative to each other through the slider flat wear plate 46 and the sliding flat plate 52 .

[0065] As an optional embodiment, the top outer edge of the middle support plate 31 extends outward to form a protrusion 312, and the lower support unit 5 further includes a stabilizing bolt 53, which is movably connected to the top of the lower support plate 51. The stabilizing bolt 53 can adjust the relative distance between the top of the stabilizing bolt 53 and the top surface of the lower support plate 51 so that the top of the stabilizing bolt 53 can contact the bottom surface of the protrusion 312 and form a support.

[0066] The blocks on both sides of the lower support plate 51 and the guide rails 43 on the height adjustment slider 41 can serve as the first level of guidance and stability guarantee for the center support plate 31. On this basis, after the support is adjusted, the position of the stabilizing bolt 53 can be adjusted so that the stabilizing bolt 53 can form support for the center support plate 31, providing the second level of stability guarantee for the center support plate 31 after the adjustment.

[0067] As an optional embodiment, it also includes a dustproof component 6, which preferably includes a dustproof plate. The dustproof plate is connected to the bottom of the upper support plate 11 by bolts and is located on the outside of the lower support plate 51. The dustproof component 6 can play a dustproof role, reduce the dust entering the interior of the adjustable height support, improve the use effect, and extend the service life.

[0068] When adjusting the height, by turning the adjusting nut 422, the adjusting screw 421 can be driven to move along its length direction. When the adjusting screw 421 moves, the height adjustment slider 41 can be driven to move synchronously. The position change of the height adjustment slider 41 can be converted into a height change of the middle support plate 31. The height adjustment slider 41 can drive the middle support plate 31 to move in the vertical direction while moving. Stepless height adjustment is achieved through the relative displacement of the inclined plane, and by installing the guide rail 43 on the height adjustment slider 41, it plays a guiding role during the displacement process, and cooperates with the two baffles on the lower support plate 51 to guide and limit the middle support plate 31 moving upward and downward, forming the first layer of guarantee for maintaining the stability of the adjustable height support. After the height adjustment is completed, the middle support plate 31 is supported by the stabilizing bolt 53, forming the first layer of guarantee for maintaining the stability of the adjustable height support, which effectively improves the overall stability of the support.

[0069] Example 2

[0070] Reference Figures 4 to 6 This embodiment provides an adjustable height support. The difference from the first embodiment is that the cross-sectional shape of the middle support plate 31 and the height adjustment slider 41 is circular, and correspondingly, the two stoppers on both sides of the lower support plate 51 are adjusted to fan-shaped plate structures;

[0071] With such an arrangement, the adjustable height support mentioned in this embodiment can directly guide and position the middle support plate 31 through the two blocks on the lower support plate 51, and at the same time limit its lateral displacement, thereby eliminating the need to set up the guide rail 43, effectively simplifying the structural form and reducing costs.

[0072] Example 3

[0073] Reference Figure 7 This embodiment provides an adjustable height support. The difference from the first and second embodiments is that the structural form of the adjustment component 42 corresponding to this embodiment is different, and a rocker structure is adopted.

[0074] In this embodiment, the adjustment assembly 42 includes an adjustment rocker 423 and a bearing structure 424. The adjustment rocker 423 is threadedly connected to the lower support plate 51. The bearing seat of the bearing structure 424 is connected to the height adjustment slider 41. One end of the adjustment rocker 423 is movably connected to the bearing structure 424 and the other end is located outside the lower support plate 51.

[0075] The adjustment rocker 423 can be automatically rotated. By setting the adjustment rocker 423 to be threadedly connected with the lower support plate 51, when the adjustment rocker 423 is shaken, the height adjustment slider 41 can be driven to move and slide, which can also achieve the purpose of adjusting the support height. The structural form of the rocker enriches the adjustment method, so that the adjustable height support has more diverse options when adjusting the height.

[0076] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An adjustable height support, characterized in that: The invention comprises an upper support unit (1), a spherical cap unit (2), a middle support unit (3), a height adjustment unit (4) and a lower support unit (5), wherein the upper support unit (1) is in sliding contact with the top of the spherical cap unit (2), the spherical cap unit (2) is in sliding contact with the top of the middle support unit (3), the outer side surface of the middle support unit (3) is in sliding contact with the inner side surface of the lower support unit (5), the top of the height adjustment unit (4) is in sliding contact with the bottom of the middle support unit (3) and the bottom of the height adjustment unit (4) is in sliding contact with the lower support unit (5), the height adjustment unit (4) can drive the middle support unit (3) to move in the vertical direction relative to the lower support unit (5), and the upper support unit (1) and the spherical cap unit (2) can follow the middle support unit (3) to move synchronously in the vertical direction.

2. The height-adjustable support according to claim 1, characterized in that: The height adjustment unit (4) includes a height adjustment slider (41) and an adjustment component (42), the middle support unit (3) includes a middle support plate (31), and the lower support unit (5) includes a lower support plate (51), the bottom of the middle support plate (31) and the top of the height adjustment slider (41) are both inclined and parallel to each other, the top of the height adjustment slider (41) is in sliding contact with the bottom of the middle support plate (31), and the bottom of the height adjustment slider (41) is in sliding contact with the lower support plate (51), and the adjustment component (42) is movably connected to the height adjustment slider (41), and the adjustment component (42) can drive the height adjustment slider (41) to move in the horizontal direction relative to the lower support plate (51), and the height adjustment slider (41) can drive the middle support plate (31) to move in the vertical direction while moving.

3. The height-adjustable support according to claim 2, characterized in that: The upper support unit (1) includes an upper support plate (11) and a flat slide plate (12), wherein the flat slide plate (12) is connected to the bottom of the upper support plate (11); the spherical cap unit (2) includes a spherical cap lining plate (21) and a flat wear-resistant plate (22), wherein the flat wear-resistant plate (22) is embedded in the top of the spherical cap lining plate (21), and the bottom of the flat slide plate (12) is in sliding contact with the top of the flat wear-resistant plate (22).

4. The height-adjustable support according to claim 3, characterized in that: The spherical cap unit (2) further comprises a spherical slide plate (23), wherein the spherical slide plate (23) is connected to the bottom of the spherical cap lining plate (21); the middle support unit (3) further comprises a spherical wear-resistant plate (32), wherein the spherical wear-resistant plate (32) is embedded in the top of the middle support plate (31); and the bottom of the spherical slide plate (23) is in sliding contact with the top of the spherical wear-resistant plate (32).

5. The height-adjustable support according to claim 2, characterized in that: The adjustment assembly (42) comprises an adjustment screw (421) and an adjustment nut (422); the adjustment screw (421) is connected to the height adjustment slider (41) and its two ends respectively pass through the two sides of the lower support plate (51); and the two adjustment nuts (422) are each threadedly connected to one end of the adjustment screw (421).

6. The height-adjustable support according to claim 2, characterized in that: A guide rail groove (311) is provided on the bottom inclined surface of the middle support plate (31); the middle support unit (3) further comprises a middle support slide plate (33); the middle support slide plate (33) is connected to the bottom of the middle support plate (31) and the inner side wall of the guide rail groove (311); the height adjustment unit (4) further comprises a guide rail (43), a guide rail slide bar (44) and a slider inclined surface wear-resistant plate (45); the guide rail (43) is connected to the top of the height adjustment slider (41) and corresponds to the guide rail groove (311); the guide rail slide bar (44) is respectively connected to both sides of the guide rail (43); the slider inclined surface wear-resistant plate (45) is connected to the top inclined surface of the height adjustment slider (41); the middle support slide plate (33) is in sliding contact with the slider inclined surface wear-resistant plate (45) and the guide rail slide bar (44) respectively.

7. The height-adjustable support according to claim 2, characterized in that: The adjustment assembly (42) includes an adjustment rocker (423) and a bearing structure (424), wherein the adjustment rocker (423) is threadedly connected to the lower support plate (51), a bearing seat of the bearing structure (424) is connected to the height adjustment slider (41), one end of the adjustment rocker (423) is movably connected to the bearing structure (424) and the other end is located outside the lower support plate (51).

8. The height-adjustable support according to claim 2, characterized in that: The height adjustment unit (4) further includes a slider plane wear-resistant plate (46), and the slider plane wear-resistant plate (46) is embedded in the bottom of the height adjustment slider (41). The lower support unit (5) further includes a sliding plane plate (52), and the sliding plane plate (52) is connected to the top of the lower support plate (51). The bottom of the slider plane wear-resistant plate (46) is in sliding contact with the top of the sliding plane plate (52).

9. The height-adjustable support according to claim 2, characterized in that: The outer edge of the top of the middle support plate (31) extends outward to form a protrusion (312), and the lower support unit (5) also includes a stabilizing bolt (53), which is movably connected to the top of the lower support plate (51). The stabilizing bolt (53) can adjust the relative distance between its top and the top surface of the lower support plate (51) so that its top can contact the bottom surface of the protrusion (312) and form support.

10. The height-adjustable support according to claim 3, characterized in that: It also includes a dustproof component (6), which is connected to the bottom of the upper support plate (11) and is located on the outside of the lower support plate (51).

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