Engineering drawing paper limiting structure

Abstract

The utility model discloses an engineering drawing paper limiting structure, which relates to the technical field of drawing tables and specifically comprises a table board, a support frame arranged at the bottom of the table board, a support frame arranged at the bottom of the support frame, strip-shaped plates extending downwards respectively arranged on two sides of the table board, and guide rails respectively mounted on opposite side surfaces of the two strip-shaped plates. The sliding block on each guide rail is connected with an L-shaped connecting frame extending to the outer side of the bottom of the corresponding strip-shaped plate, a first supporting arm with the top located above the table plate is installed at the tail end of each L-shaped connecting frame, and a strip-shaped groove is formed in the side face of each first supporting arm. When the drawing table is used and needs to be inclined, adjustment can be achieved only by rotating the first rotary knob, after a drawing is laid on the table board, the first connecting rod can be held by hand to move the third connecting rod to the edge of the top of the drawing, the drawing is pressed by the bottom of the third connecting rod, and the drawing is prevented from sliding under the action of external force.

Description

Technical Field

[0001] The utility model relates to the technical field of drawing tables, in particular to a limiting structure for engineering drawing drawings. Background Art

[0002] A drawing table, also known as a painting table, an art table, or a drawing table, is a drawing support used in the field of art creation and engineering drawing. In short, a drawing table is a drawing tool used by draftsmen to post drawing paper and successfully complete drawing operations.

[0003] Existing drawing tables have a simple structure and single functionality. After the drawings are placed on the desktop, they are easy to move if they are not fixed, which will bring inconvenience to the drawing process. For example, a drawing table for art is proposed with patent application number "202223309688.0". It is by rotating the four handles so that the handles drive the corresponding screw rods and pressure plates to rotate and move down, and the four pressure plates can be used to press the drawing paper tightly and fix it on the drawing table. The user can pick up the brush and mix the watercolor paint to draw on the drawing paper, thereby preventing the drawing paper from shifting during the drawing process. However, the handles and screw rods are both exposed above the desktop. Because the arms need to tilt as the drawings change when drawing, the handles and screw rods will hinder the movement of the arms. To this end, we propose a limiting structure for engineering drawing drawings. Utility Model Content

[0004] Aiming at the disadvantage that drawings are easy to slip when working on existing drawing tables, the utility model provides an engineering drawing drawing limiting structure, which has the advantages of pressing the edges of the drawings and adjusting the inclination of the table top, thus solving the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] Design an engineering drawing drawing limiting structure, including a table top, a support frame is provided at the bottom of the table top, a support frame is provided at the bottom of the support frame, strip boards extending downward are respectively provided on both sides of the table top, guide rails are respectively installed on the opposite sides of the two strip boards, the sliders on each guide rail are connected to an L-shaped connecting frame extending to the outside of the bottom of the strip board, a first supporting arm with a top located above the table top is installed at the end of each L-shaped connecting frame, and strip grooves are opened on the sides of the first supporting arm;

[0007] The tops of the two first support arms are connected by a first connecting rod, a second connecting rod is arranged parallel to the lower part of the first connecting rod, a third connecting rod is arranged below the second connecting rod, and the third connecting rod is connected to the second connecting rod by a plurality of connecting seats;

[0008] Both ends of the second connecting rod are provided with a first slide seat movably placed in the strip groove. The bottom of each first slide seat is connected to a tensioning spring. The tensioning spring is placed in the strip groove and its bottom is connected to the bottom of the strip groove. Under the action of the tensioning spring, the bottom of the third connecting rod is placed parallel to the surface of the table top.

[0009] Preferably, a rubber pad is provided at the bottom of the third connecting rod, and a strip opening for easy grasping is provided below the middle position of the second connecting rod.

[0010] Preferably, one side of the bottom of the table top is rotatably mounted on the support frame, the bottom of the support frame is sealed by a sealing plate, and an adjustment mechanism that can drive the table top to adjust the inclination is provided in the support frame, and the adjustment mechanism includes a lead screw arranged in the middle of the support frame and guide rods arranged on both sides of the lead screw, and the lead screw and the guide rod are respectively perpendicular to the first connecting rod;

[0011] A strip-shaped support arm is also provided in the support frame and is vertically arranged with the lead screw. The middle part of the strip-shaped support arm is threadedly connected with the lead screw, and both ends are respectively slidably connected with the guide rod. At least two symmetrically arranged second support arms are rotatably connected to the strip-shaped support arm. The second support arm is tilted upward, and the other end is rotatably arranged under the table top.

[0012] Among them, the first connecting rod is located at the top of the table top, the two ends of the screw are rotatably connected to the inner wall of the support frame, and the two ends of the guide rod are fixed to the inner wall of the support frame. The end of the screw away from the top of the table top extends to the outside of the support frame and is connected to the first knob.

[0013] Preferably, one end of the two strip plates away from the first support arm extends to the outside of the edge of the table top, and an adjustment slot perpendicular to the table top is provided at the end of each strip plate;

[0014] A strip blocking seat is arranged between the two strip plates, and both ends of the strip blocking seat are provided with a second slide seat movably placed in the adjustment groove, and one end of the second slide seat away from the strip blocking seat is provided with a locking bolt, and the locking bolt is threadedly connected with a second knob;

[0015] Among them, the top of the strip blocking seat and the second sliding seat are arranged in a stepped manner. When the table top is tilted, the strip blocking seat is moved up along the adjustment groove so that the top of the strip blocking seat is exposed above the edge of the table top. When the table top is horizontal, the strip blocking seat is moved down along the adjustment groove so that the top of the strip blocking seat is exposed to be flush with the edge of the table top.

[0016] Preferably, the support frame includes support legs arranged at both ends of one side of the bottom of the support frame, and arc-shaped support legs are respectively connected to both ends of the other side of the bottom of the support frame, and the arc-shaped support legs are bent toward the support legs. The bottoms of the support legs and the arc-shaped support legs are both connected to the strip seat, and support pads are installed at both ends of the strip seat.

[0017] Preferably, one end of the support frame is horizontally connected to a connecting plate, a strip box is installed at the end of the connecting plate, and the strip box is divided into a plurality of storage chambers by a partition;

[0018] A placing plate is provided below the other end of the supporting frame, and one side of the placing plate is connected to the supporting leg and the side surface of the arc-shaped supporting leg.

[0019] Preferably, both ends of the inclined plate are connected to the supporting legs and the arc-shaped supporting legs respectively, and a baffle is vertically connected to the bottom of the inclined plate, and the baffle and the inclined plate both form a "V"-shaped placement frame with an opening facing upward.

[0020] Preferably, a cabinet body is provided at the bottom of the support frame, the cabinet body is provided with at least two drawers, and the drawers and the cabinet body are connected via drawer guide rails.

[0021] Compared with the prior art, when the utility model is in use, when tilting is required, it can be adjusted by simply turning the first knob. After the drawing is laid on the table top, the first connecting rod can be held to move the third connecting rod to the top edge of the drawing, so that the bottom of the third connecting rod can press the drawing tightly to prevent the drawing from slipping under the action of external force. At the same time, the table top can also be adjusted to a horizontal level, so that the table top can be used like a normal drawing table, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure on the right side of the utility model.

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the left side of the utility model.

[0024] Figure 3 It is a schematic diagram of the structure inside the support frame of the utility model.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the rear side of the utility model.

[0026] Figure 5 It is a schematic diagram of the specific structure of the connection between the first connecting rod and the first supporting arm of the utility model.

[0027] Figure 6 It is a structural schematic diagram of the strip-shaped blocking seat of the utility model.

[0028] In the figure: 1, table top; 2, strip blocking seat; 3, placement plate; 4, drawer; 5, cabinet; 6, first knob; 7, second knob; 8, baffle; 9, arc-shaped leg; 10, strip seat; 11, support leg; 12, tilting plate; 13, strip box; 14, connecting plate; 15, support frame; 16, first support arm; 17, strip plate; 18, strip groove; 19, first slide seat; 20, first connecting rod; 21, tension spring; 22, strip mouth; 23, connecting seat; 24, second connecting rod; 25, third connecting rod; 26, drawing; 27, reinforcement rod; 28, second support arm; 29, adjustment groove; 30, guide rod; 31, strip arm; 32, lead screw; 33, sealing plate; 34, guide rail; 35, locking bolt; 36, slider; 37, L-shaped connecting frame; 38, second slide seat. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figures 1 to 6 The utility model provides a technical solution: an engineering drawing drawing limiting structure, including a table top 1, a support frame 15 is provided at the bottom of the table top 1, and a support frame (equivalent to a support leg supporting the table top) is provided at the bottom of the support frame 15.

[0031] The four sides of the table top 1 extend to the outside of the support frame 15, that is, the support frame 15 is located below the middle of the table top 1, and the two sides of the table top 1 are respectively provided with strip plates 17 extending downwards. Figure 5 As shown, guide rails 34 are respectively installed on the opposite sides of the two strip plates 17. Figure 5 As shown, the slider 36 on each guide rail 34 is connected to an L-shaped connecting frame 37 extending to the outside of the bottom of the strip board 17, and the first support arm 16 with the top above the table board 1 is installed at the end of each L-shaped connecting frame 37. Figure 1 Therefore, the strip board 17 is arranged below the two ends of the table top 1, so as to avoid the top of the strip board 17 being exposed above the table top 1 to form a step that affects the drawing;

[0032] like Figure 1 and Figure 5 As shown, the tops of the two first support arms 16 are connected by a first connecting rod 20, a second connecting rod 24 is provided in parallel below the first connecting rod 20, a third connecting rod 25 is provided below the second connecting rod 24, and the third connecting rod 25 is connected to the second connecting rod 24 through a plurality of connecting seats 23;

[0033] The side surfaces of the first support arm 16 are provided with strip grooves 18, and both ends of the second connecting rod 24 are provided with first slide seats 19 movably placed in the strip grooves 18. The first slide seats 19 are of rectangular structure and are clearance-matched with the strip grooves 18. The bottom of each first slide seat 19 is connected to a tensioning spring 21, which is placed in the strip grooves 18 and the bottom of which is connected to the bottom of the strip grooves 18. Under the action of the tensioning spring 21, the bottom of the third connecting rod 25 is placed parallel to the surface of the table top 1.

[0034] Specifically, the first connecting rod 20 mainly plays a grasping role, that is, holding the first connecting rod 20 can push the first supporting arm 16 to slide back and forth along the strip plate 17, and the second connecting rod 24 is mainly used to hook the fingers and lift upward. The specific operation process is to clamp the base of the palm on the first connecting rod 20, and then hook the remaining four fingers at the bottom of the second connecting rod 24, bend the four fingers to lift the second connecting rod 24, and separate the third connecting rod 25 from the surface of the table board. At this time, the third connecting rod 25 can be moved to any position on the surface of the table board;

[0035] like Figure 1 As shown, after the drawing 26 is laid flat on the table 1, the third connecting rod 25 is moved to the top of the drawing 26, and then the hand is released, and the third connecting rod 25 is driven by the tension spring 21 to press only on the top edge of the drawing 26, so that the drawing 26 can be firmly fixed. In order to prevent the edge of the drawing from being crushed, a rubber pad is provided at the bottom of the third connecting rod 25, and a strip opening 22 for easy grasping is provided below the middle position of the second connecting rod 24, and a finger can be hooked in the strip opening 22.

[0036] Furthermore, the table top can be rotated, that is, the inclination of the table top can be adjusted, so that the table top can be adjusted to a preset inclination or to a horizontal position. Specifically, one side of the bottom of the table top 1 is rotated and mounted on the support frame 15, and the two are hinged and fixed. The support frame 15 is provided with an adjustment mechanism that can drive the table top 1 to adjust the inclination, and the bottom of the support frame 15 is sealed by a sealing plate 33;

[0037] like Figure 3 As shown, the adjustment mechanism includes a lead screw 32 disposed in the middle of the support frame 15 and guide rods 30 disposed on both sides of the lead screw 32, and the lead screw 32 and the guide rod 30 are respectively perpendicular to the first connecting rod 20;

[0038] A strip-shaped support arm 31 is also provided in the support frame 15 and is vertically arranged with the lead screw. The middle part of the strip-shaped support arm 31 is threadedly connected with the lead screw 32, and both ends are slidably connected with the guide rod 30. Both ends of the strip-shaped support arm 31 are sleeved on the guide rod 30 through sliding sleeves, and the middle part of the strip-shaped support arm 31 is connected with the lead screw 32 through a nut, so when the lead screw is rotated, the strip-shaped support arm 31 can be driven to reciprocate along the guide rod 30.

[0039] At least two symmetrically arranged second support arms 28 are rotatably connected to the strip-shaped support arm 31. The second support arms 28 are arranged to be tilted upward, and the other end is rotatably arranged below the table top 1. Both ends of the second support arms 28 are hinged and fixed.

[0040] like Figure 1 As shown, the first connecting rod 20 is located at the top of the table top, the two ends of the lead screw 32 are rotatably connected to the inner wall of the support frame 15, and the two ends of the guide rod 30 are fixed to the inner wall of the support frame 15. The end of the lead screw 32 away from the top of the table top extends to the outside of the support frame 15 and is connected to the first knob 6. The first knob 6 is disc-shaped, which is convenient for rotating it. When the first knob 6 is rotated, the first knob 6 drives the lead screw 32 to rotate, and the lead screw 32 drives the bar arm 31 to reciprocate, so the bar arm 31 drives the second support arm 28 to rise and fall, so that the second support arm 28 drives the table top 1 to adjust the inclination. When the table top 1 is placed horizontally, the second support arm 28 is folded in the support frame 15, and the second support arms 28 are connected by reinforcing rods 27 to strengthen the support strength between the second support arms 28.

[0041] When the table top is tilted, the drawings placed on the surface may fall down along the tilted surface. Therefore, in order to prevent the drawings from falling, a blocking mechanism is provided at the bottom of the table top, that is, two strip boards 17 extend to the outside of the edge of the table top 1 at one end away from the first support arm 16, and an adjustment slot 29 perpendicular to the table top 1 is provided at the end of each strip board 17;

[0042] A strip-shaped blocking seat 2 is provided between the two strip plates 17. Figure 6 As shown, both ends of the strip blocking seat 2 are provided with a second slide seat 38 movably placed in the adjustment groove 29, the second slide seat 38 is a rectangular structure and is clearance-matched with the adjustment groove 29, and the second slide seat 38 is provided with a locking bolt 35 at one end away from the strip blocking seat 2, and the locking bolt 35 is threadedly connected with a second knob 7, and the second knob 7 is also a disc-shaped structure for easy rotation;

[0043] like Figure 6 As shown, the top of the strip blocking seat 2 and the second slide seat 38 are arranged in a stepped manner. It should be noted that when the table top is tilted, the strip blocking seat 2 is needed to block it, but when it is horizontal, if the strip blocking seat 2 extends above the table top, it will hinder drawing. Therefore, when the table top 1 is tilted, the strip blocking seat 2 is moved up along the adjustment groove 29, so that the top of the strip blocking seat 2 is above the edge of the table top 1, and the top of the strip blocking seat 2 is stepped with the edge of the table top 1. When the table top 1 is horizontal, the strip blocking seat 2 is moved down along the adjustment groove 29, so that the top of the strip blocking seat 2 is flush with the edge of the table top 1, so as to avoid drawing the strip blocking seat 2 scheme.

[0044] Further, such as Figure 1As shown, the support frame includes support legs 11 arranged at both ends of one side of the bottom of the support frame 15, and arc-shaped support legs 9 are respectively connected at both ends of the other side of the bottom of the support frame 15. The arc-shaped support legs 9 are bent toward the support legs 11. The bottoms of the support legs 11 and the arc-shaped support legs 9 are both connected to the strip seat 10. Support pads are installed at both ends of the strip seat 10. The arc-shaped support legs 9 can increase the placement space for the legs to avoid the arc-shaped support legs 9 being straight and blocking the legs.

[0045] like Figure 1 and Figure 3 As shown, one end of the support frame 15 is horizontally connected to a connecting plate 14, and a strip box 13 is installed at the end of the connecting plate 14. The strip box 13 is divided into multiple storage cavities by partitions. The storage cavity can prevent drawing tools such as pencils and rulers from being put in; Figure 2 As shown, a placement plate 3 is provided below the other end of the support frame 15, and one side of the placement plate 3 is connected to the side of the support leg 11 and the arc-shaped support leg 9. The placement plate 3 can be used to place other items, such as books, etc. In order to make the placement plate 3 and the connecting plate 14 have a higher supporting strength, a tripod can be connected below the two to allow the tripod to support them.

[0046] Further, such as Figure 1 As shown, the two ends of the inclined plate 12 are respectively connected to the supporting legs 11 and the arc-shaped supporting legs 9, and a baffle 8 is vertically connected to the bottom of the inclined plate 12. The baffle 8 and the inclined plate 12 both form a "V"-shaped placement rack with an opening facing upward, which can further increase the storage space.

[0047] Finally, when the utility model is in use, the table top can be laid flat or tilted. When tilting is required, it can be adjusted by simply turning the first knob 6. The operation is simple and easy to use. After laying the drawing on the table top, the first connecting rod 20 can be held to move the third connecting rod 25 to the top edge of the drawing, so that the bottom of the third connecting rod 25 can press the drawing to prevent the drawing from slipping under the action of external force.

[0048] Based on the above embodiment, further optimization can be performed. A cabinet 5 is provided at the bottom of the support frame 15. The cabinet is provided with at least two drawers 4. The drawers 4 and the cabinet 5 are connected by drawer guides. The provided drawers can further increase the storage space.

[0049] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A limiting structure for engineering drawing drawings, comprising a table top (1), wherein a support frame (15) is provided at the bottom of the table top (1), characterized in that: A support frame is provided at the bottom of the support frame (15), and strip plates (17) extending downward are respectively provided on both sides of the table top (1), and guide rails (34) are respectively installed on the opposite sides of the two strip plates (17), and the sliders (36) on each guide rail (34) are connected to an L-shaped connecting frame (37) extending to the outside of the bottom of the strip plate (17), and a first support arm (16) with the top located above the table top (1) is installed at the end of each L-shaped connecting frame (37), and a strip groove (18) is opened on the side of the first support arm (16); The tops of the two first support arms (16) are connected by a first connecting rod (20); a second connecting rod (24) is arranged parallel to the bottom of the first connecting rod (20); a third connecting rod (25) is arranged below the second connecting rod (24); and the third connecting rod (25) is connected to the second connecting rod (24) by a plurality of connecting seats (23); Both ends of the second connecting rod (24) are provided with a first slide seat (19) movably placed in the strip groove (18), and the bottom of each first slide seat (19) is connected to a tension spring (21). The tension spring (21) is placed in the strip groove (18) and its bottom is connected to the bottom of the strip groove (18). Under the action of the tension spring (21), the bottom of the third connecting rod (25) is placed parallel to the surface of the table top (1).

2. The engineering drawing paper limiting structure according to claim 1 is characterized in that: A rubber pad is provided at the bottom of the third connecting rod (25), and a strip-shaped opening (22) for easy grasping is provided below the middle position of the second connecting rod (24).

3. The engineering drawing paper limiting structure according to claim 1 is characterized in that: One side of the bottom of the table top (1) is rotatably mounted on the support frame (15), the bottom of the support frame (15) is sealed by a sealing plate (33), an adjustment mechanism capable of driving the table top (1) to adjust its inclination is provided in the support frame (15), the adjustment mechanism comprising a lead screw (32) arranged in the middle of the support frame (15) and guide rods (30) arranged on both sides of the lead screw (32), the lead screw (32) and the guide rod (30) being respectively perpendicular to the first connecting rod (20); A strip-shaped support arm (31) is also provided in the support frame (15) and is arranged perpendicular to the lead screw. The middle part of the strip-shaped support arm (31) is threadedly connected to the lead screw (32), and both ends are slidably connected to the guide rod (30). At least two symmetrically arranged second support arms (28) are rotatably connected to the strip-shaped support arm (31). The second support arms (28) are arranged obliquely upward, and the other end is rotatably arranged below the table top (1). The first connecting rod (20) is located at the top of the table top, the two ends of the lead screw (32) are rotatably connected to the inner wall of the support frame (15), and the two ends of the guide rod (30) are fixed to the inner wall of the support frame (15), and the end of the lead screw (32) away from the top of the table top extends to the outside of the support frame (15) and is connected to the first knob (6).

4. The engineering drawing paper limiting structure according to claim 3 is characterized in that: One end of the two strip plates (17) away from the first support arm (16) extends to the outside of the edge of the table top (1), and an adjustment slot (29) perpendicular to the table top (1) is provided at the end of each strip plate (17); A strip-shaped blocking seat (2) is provided between the two strip-shaped plates (17), and a second slide seat (38) movably placed in the adjustment groove (29) is provided at both ends of the strip-shaped blocking seat (2), and a locking bolt (35) is provided at one end of the second slide seat (38) away from the strip-shaped blocking seat (2), and a second knob (7) is threadedly connected to the locking bolt (35); The top of the strip blocking seat (2) and the second slide seat (38) are arranged in a stepped manner. When the table top (1) is tilted, the strip blocking seat (2) is moved upward along the adjustment groove (29) so that the top of the strip blocking seat (2) is exposed above the edge of the table top (1). When the table top (1) is horizontal, the strip blocking seat (2) is moved downward along the adjustment groove (29) so that the top of the strip blocking seat (2) is exposed to be flush with the edge of the table top (1).

5. The engineering drawing paper limiting structure according to claim 1, characterized in that: The support frame comprises support legs (11) arranged at two ends of one side of the bottom of the support frame (15), and arc-shaped support legs (9) are respectively connected to two ends of the other side of the bottom of the support frame (15), and the arc-shaped support legs (9) are bent toward the support legs (11), and the bottoms of the support legs (11) and the arc-shaped support legs (9) are both connected to the strip seat (10), and support pads are installed at both ends of the strip seat (10).

6. The engineering drawing paper limiting structure according to claim 5, characterized in that: One end of the support frame (15) is horizontally connected to a connecting plate (14), a strip box (13) is installed at the end of the connecting plate (14), and the strip box (13) is divided into a plurality of storage chambers by partitions; A placement plate (3) is provided below the other end of the support frame (15), and one side of the placement plate (3) is connected to the side surfaces of the support leg (11) and the arc-shaped support leg (9).

7. The engineering drawing paper limiting structure according to claim 6, characterized in that: The two ends of the inclined plate (12) are respectively connected to the supporting legs (11) and the arc-shaped supporting legs (9), and a baffle (8) is vertically connected to the bottom of the inclined plate (12). The baffle (8) and the inclined plate (12) both form a "V"-shaped placement frame with an opening facing upward.

8. An engineering drawing paper limiting structure according to any one of claims 5 to 7, characterized in that: A cabinet body (5) is provided at the bottom of the support frame (15), and the cabinet body is provided with at least two drawers (4). The drawers (4) and the cabinet body (5) are connected via drawer guide rails.

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