Pay-off device for engineering surveying and mapping

Abstract

The utility model relates to the technical field of pay-off devices, and discloses an engineering surveying and mapping pay-off device which comprises a supporting frame, a rotating shaft, a reel, a linear sliding table, a first bending plate, a first round roller, a second bending plate and a second round roller. In the using process, after the second round rollers on the two sides and the first round rollers on the two sides are distributed in a #-shaped mode, a rope can be limited. When the rotating shaft is driven by external force to rotate, the reel can be driven to rotate, so that the rope is wound or released. In the winding or releasing process, the linear sliding table is controlled to work, the first bending plate can be driven to move, the second round rollers on the two sides and the first round rollers on the two sides are finally driven to move, and then the rope is driven to move, so that the rope can be evenly wound on the reel or the friction force borne by the rope in the releasing process is reduced. In addition, due to the fact that the second round rollers on the two sides and the first round rollers on the two sides can rotate along with movement of the rope, sliding friction can be converted into rolling friction. Friction force on the rope is reduced, and abrasion damage is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire laying device, for example, relates to a wire laying device for engineering surveying. BACKGROUND

[0002] A wire laying device for engineering surveying is disclosed in the related technology (publication number: CN221026816U), which comprises a movable trolley. The movable trolley is symmetrically connected with a support frame at the front and rear middle positions of the upper surface. A rotating motor is connected to the middle position of the lower surface of the rear surface of the support frame. A winding roller is connected to the inner surface of the lower part of the support frame. A rodless cylinder is inserted into the middle position of the upper surface of the support frame. A guide device is connected to the middle position of the right surface of the rodless cylinder.

[0003] In the process of implementing the above-mentioned embodiments, it is found that at least the following problems exist in the related technology:

[0004] The wire laying device for engineering surveying can move the guide device according to the position of the rope on the roller, thereby reducing the friction between the rope and the guide device during wire laying. However, since the cylinder is moved by air pressure, it has the characteristic of rapid action, which makes it difficult for the guide device to move smoothly with the release of the rope. In addition, the rope and the guide device are in sliding friction, which causes the rope to be subjected to a large friction force, which easily causes damage to the rope.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor does it determine the key / important elements or delineate the scope of protection of these embodiments, but serves as a prelude to the detailed description below.

[0007] The wire laying device for engineering surveying provided by the embodiments of the present application solves the problems raised in the background art.

[0008] In some embodiments, the engineering surveying and layout device includes: a support frame, the support frame including a first support plate and a second support plate, the second support plate being connected to the top surface of the first support plate, and the plane of the second support plate being perpendicular to the plane of the first support plate; a rotating shaft, rotatably mounted on the second support plate along the length direction of the support frame; a reel, mounted on the rotating shaft; a linear slide, mounted on the top surface of the first support plate along the length direction of the support frame; and a first bending plate, mounted on the moving end of the linear slide, with the bending plate and the reel located along the width direction of the support frame. The support frame consists of two sides; a first roller, rotatably mounted on the first bending plate along the length of the support frame, and located on both sides of the first bending plate along the height of the support frame; a second bending plate, slidably mounted on the first bending plate; and a second roller, rotatably mounted on the second bending plate along the height of the support frame, and located on both sides of the second bending plate along the length of the support frame. The second rollers on both sides and the first rollers on both sides are arranged in a grid pattern. The rotating shaft can be controlled to rotate to drive the reel to rotate, and the second bending plate can be controlled to slide to drive the second rollers on both sides to move up and down.

[0009] Optionally, it further includes: a guide rail, mounted on the first bending plate along the height direction of the support frame; and a slider, slidably mounted on the guide rail and connected to the second bending plate.

[0010] Optionally, it further includes: a cylinder, installed between the first bending plate and the second bending plate along the height direction of the support frame.

[0011] Optionally, it further includes: a support rod, mounted on the second support plate along the length of the support frame; a mounting plate, mounted on the support rod; and a motor, mounted on the mounting plate, wherein the axis of the rotating end of the motor is parallel to the axis of the rotating shaft; wherein the rotating shaft rotates under the drive of the motor.

[0012] Optionally, it further includes: a driving pulley, installed on the rotating end of the motor; a driven pulley, installed on the rotating shaft; and a belt, fitted onto the driving pulley and the driven pulley; wherein the diameter of the driving pulley is smaller than the diameter of the driven pulley.

[0013] Optionally, it further includes: a bearing housing mounted on the second support plate; an angular contact ball bearing mounted opposite to it inside the bearing housing; and a deep groove ball bearing mounted inside the bearing housing. Along the length of the support frame, the deep groove ball bearing and the angular contact ball bearing are located on both sides of the bearing housing; wherein the rotating shaft is mounted inside the deep groove ball bearing and the angular contact ball bearing.

[0014] Optionally, further comprising a fixing ring mounted on the rotating shaft and abutting against the deep groove ball bearing.

[0015] Optionally, further comprising a nut threadedly connected to the rotating shaft and abutting against the angular contact ball bearing.

[0016] Optionally, the support frame further comprises a reinforcing plate mounted at the connection between the first support plate and the second support plate, and / or a base mounted at the bottom surface of the first support plate at four corners, respectively.

[0017] The wire releasing device for engineering surveying provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] The wire releasing device for engineering surveying provided by the embodiments of the present disclosure comprises a support frame, a rotating shaft, a reel, a linear slide, a first bending plate, a first round roller, a second bending plate and a second round roller. The support frame comprises a first support plate and a second support plate, the second support plate is connected to the top surface of the first support plate, the plane where the second support plate is located is perpendicular to the plane where the first support plate is located, and the second support plate and the first support plate are respectively used for supporting relevant parts of the installation device. The rotating shaft is rotatably mounted on the second support plate along the length direction of the support frame and can rotate relative to the second support plate. The reel is mounted on the rotating shaft and is used for winding the rope and rotating under the driving of the rotating shaft to wind or release the rope. The linear slide is mounted on the top surface of the first support plate along the length direction of the support frame and is used for providing driving force to realize linear movement. The first bending plate is mounted on the moving end of the linear slide along the width direction of the support frame, and the bending plate and the reel are located on both sides of the support frame. The first bending plate moves along the length direction of the support frame under the driving of the linear slide. The first round roller is rotatably mounted on the first bending plate along the length direction of the support frame and is located on both sides of the first bending plate along the height direction of the support frame, both sides of the first round roller can rotate relative to the first bending plate, and both sides of the first round roller are used for limiting the rope. The second bending plate is slidably mounted on the first bending plate and can slide relative to the first bending plate along the height direction of the support frame. The second round roller is rotatably mounted on the second bending plate along the height direction of the support frame and is located on both sides of the second bending plate along the length direction of the support frame, both sides of the second round roller can rotate relative to the second bending plate, and both sides of the second round roller are used for limiting the rope. Both sides of the second round roller and both sides of the first round roller are distributed in a cross shape and enclose a rectangular hole for passing the rope. The rotating shaft can be controlled to rotate to drive the reel to rotate, and the second bending plate can be controlled to slide to drive both sides of the second round roller to move up and down.

[0019] In use, the second and first rollers on both sides, arranged in a grid pattern, form a rectangular opening for the rope to pass through, thus limiting its movement. When the shaft is driven to rotate by an external force, it drives the reel to rotate, thereby winding or unwinding the rope. During winding or unwinding, controlling the linear slide moves the first bending plate, which in turn moves the grid-shaped second and first rollers on both sides, thus moving the rope to ensure it is evenly wound onto the reel or to reduce friction during release. Furthermore, since the second and first rollers rotate with the rope, sliding friction is converted into rolling friction, reducing friction and thus wear. When the second bending plate slides relative to the first bending plate, it moves the second rollers, causing them to misalign with the first rollers. This facilitates placing the rope between the first and second rollers and also makes it easier to remove the rope from between them. Meanwhile, a linear slide table is used as the power source to achieve linear movement, which allows the first and second rollers on both sides to move smoothly as the rope is wound or released.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are considered similar elements. The drawings do not constitute a limitation of scale, and wherein:

[0022] Figure 1 This is a front view structural schematic diagram of a surveying and mapping layout device provided in an embodiment of this disclosure;

[0023] Figure 2 This is a side view of a surveying and mapping device provided in an embodiment of this disclosure.

[0024] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0025] Figure 4 yes Figure 3 Enlarged structural diagram at point B;

[0026] Figure 5 yes Figure 1 A schematic diagram of the cross-sectional structure at point CC.

[0027] Figure label:

[0028] 1: first support plate; 2: second support plate; 3: rotating shaft; 4: reel; 5: linear slide; 6: first bending plate; 7: first round roller; 8: second bending plate; 9: second round roller; 10: guide rail; 11: sliding block; 12: air cylinder; 13: support rod; 14: mounting plate; 15: motor; 16: belt; 17: bearing seat; 18: angular contact ball bearing; 19: deep groove ball bearing; 20: fixing ring; 21: nut. DETAILED DESCRIPTION

[0029] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0030] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0031] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0032] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0033] The term "plurality" means two or more, unless otherwise specified.

[0034] In the embodiments of the present disclosure, the character " / " represents that the objects before and after it are in an "or" relationship. For example, A / B represents: A or B.

[0035] The term "and / or" is a description of the association relationship of the objects, which means that there can be three relationships. For example, A and / or B, means: A or B, or, A and B, the three relationships.

[0036] It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0037] In combination with Figures 1 to 5 As shown in the drawings, the present disclosure provides a staking-out device for engineering surveying and mapping, which comprises a support frame, a rotating shaft 3, a reel 4, a linear slide 5, a first bending plate 6, a first round roller 7, a second bending plate 8 and a second round roller 9. The support frame comprises a first support plate 1 and a second support plate 2, the second support plate 2 is connected to the top surface of the first support plate 1, the plane where the second support plate 2 is located is perpendicular to the plane where the first support plate 1 is located, and the second support plate 2 and the first support plate 1 are respectively used to support the related parts of the installation device. The rotating shaft 3 is rotatably installed on the second support plate 2 along the length direction of the support frame, and can make rotational movement relative to the second support plate 2. The reel 4 is installed on the rotating shaft 3, used to wind the rope, and make rotational movement under the driving of the rotating shaft 3, so as to wind or release the rope. The linear slide 5 is installed on the top surface of the first support plate 1 along the length direction of the support frame, used to provide driving force to realize linear movement function. The first bending plate 6 is installed on the moving end of the linear slide 5, and is bent along the width direction of the support frame, and the bending plate and the reel 4 are located on both sides of the support frame. The first bending plate 6 moves along the length direction of the support frame under the driving of the linear slide 5. The first round roller 7 is rotatably installed on the first bending plate 6 along the length direction of the support frame, and is located on both sides of the first bending plate 6 along the height direction of the support frame, both sides of the first round roller 7 can rotate relative to the first bending plate 6, and are both used to limit the rope. The second bending plate 8 is slidably installed on the first bending plate 6, and can slide relative to the first bending plate 6 along the height direction of the support frame. The second round roller 9 is rotatably installed on the second bending plate 8 along the height direction of the support frame, and is located on both sides of the second bending plate 8 along the length direction of the support frame, both sides of the second round roller 9 can rotate relative to the second bending plate 8, and are both used to limit the rope. Both sides of the second round roller 9 and both sides of the first round roller 7 are distributed in a cross shape, and enclose a rectangular hole for passing the rope. Among them, the rotating shaft 3 can be controlled to rotate to drive the reel 4 to make rotational movement, and the second bending plate 8 can be controlled to slide to drive both sides of the second round roller 9 to make lifting movement.

[0038] This embodiment of the invention provides a surveying and mapping device for laying out lines. When the second rollers 9 and the first rollers 7 on both sides are arranged in a grid pattern, they form a rectangular opening for the passage of a rope, thus limiting the rope's movement. When the rotating shaft 3 is driven to rotate by an external force, it drives the reel 4 to rotate, thereby winding or releasing the rope. During winding or releasing, controlling the linear slide 5 moves the first bending plate 6, which in turn moves the grid-shaped second rollers 9 and the first rollers 7, thereby moving the rope. This allows the rope to be evenly wound onto the reel 4 or reduces the friction experienced during release. Furthermore, since the second rollers 9 and the first rollers 7 can rotate with the movement of the rope, sliding friction can be converted into rolling friction. This reduces the friction experienced by the rope, thereby reducing wear and tear. When the second bending plate 8 slides relative to the first bending plate 6, it moves the second rollers 9, causing them to be misaligned with the first rollers 7. It facilitates the placement of the rope between the first roller 7 and the second roller 9 on both sides, and also facilitates the removal of the extension cord from between the first roller 7 and the second roller 9 on both sides. At the same time, the use of a linear slide table 5 as a power source enables linear movement, allowing the first roller 7 and the second roller 9 on both sides to move smoothly as the rope is wound or released.

[0039] Optionally, combined Figure 1 and Figure 5 As shown, it also includes a guide rail 10 and a slider 11. The guide rail 10 is mounted on the first bent plate 6 along the height direction of the support frame, and is used to support the sliding slider 11. The slider 11 is slidably mounted on the guide rail 10 and is connected to the second bent plate 8, together serving as a guide and support.

[0040] In this embodiment, the guide rail 10 and the slider 11 together serve as a guide and support, so that the second bending plate 8 can slide relative to the first bending plate 6 along the height direction of the support frame.

[0041] Optionally, combined Figure 1 , Figure 2 and Figure 5 As shown, it also includes a cylinder 12. The cylinder 12 is installed between the first bending plate 6 and the second bending plate 8 along the height direction of the support frame.

[0042] In this embodiment, a cylinder 12 is also included, mounted between the first bending plate 6 and the second bending plate 8 along the height direction of the support frame. The cylinder 12 provides driving force to achieve linear movement. During use, controlling the operation of the cylinder 12 drives the second bending plate 8 to move relative to the first support plate 1, ultimately causing the second rollers 9 on both sides to be misaligned with the first rollers 7 on both sides. Furthermore, under the guiding support of the guide rail 10 and the slider 11, the radial force on the moving end of the cylinder 12 can be reduced.

[0043] Optionally, in combination with Figure 1 and Figure 3 shown, further comprising a support rod 13, a mounting plate 14 and a motor 15. The support rod 13 is mounted on the second support plate 2 along the length direction of the support frame, for supporting the mounting plate 14. The mounting plate 14 is mounted on the support rod 13, for supporting the motor 15. The motor 15 is mounted on the mounting plate 14, and the axis of the rotating end of the motor 15 is parallel to the axis of the rotating shaft 3, for providing driving force to realize the rotating motion function. Wherein, the rotating shaft 3 rotates under the driving of the motor 15.

[0044] In the embodiment of the present disclosure, the rotating shaft 3 rotates under the driving of the motor 15 to realize the automatic rotation function of rotating the turntable, so as to automatically wind or release the rope.

[0045] Optionally, in combination with Figure 1 and Figure 3 shown, further comprising a driving pulley, a driven pulley and a belt 16. The driving pulley is mounted on the rotating end of the motor 15 and rotates under the driving of the motor 15. The driven pulley is mounted on the rotating shaft 3 for driving the rotating shaft 3 to rotate. The belt 16 is sleeved on the driving pulley and the driven pulley for transmitting driving force. Wherein, the diameter size of the driving pulley is smaller than the diameter size of the driven pulley.

[0046] In the embodiment of the present disclosure, the motor 15 is controlled to work, that is, the driving pulley is driven to rotate. Through the belt 16, the driven pulley is driven to rotate, and then the rotating shaft 3 is driven to rotate. Moreover, by designing the diameter size of the driving pulley to be smaller than the diameter size of the driven pulley, the rotating speed can be reduced.

[0047] Optionally, in combination with Figure 3 and Figure 4 shown, further comprising a bearing seat 17, an angular contact ball bearing 18 and a deep groove ball bearing 19. The bearing seat 17 is mounted on the second support plate 2 for supporting the angular contact ball bearing 18 and the deep groove ball bearing 19 and limiting the angular contact ball bearing 18 and the deep groove ball bearing 19. The angular contact ball bearing 18 is mounted inside the bearing seat 17 for supporting the rotatable axis and bearing the axial force and radial force received by the rotating shaft 3. The deep groove ball bearing 19 is mounted inside the bearing seat 17 for also supporting the rotating shaft 3 and bearing the radial force received by the rotating shaft 3. Along the length direction of the support frame, the deep groove ball bearing 19 and the angular contact ball bearing 18 are located on both sides of the bearing seat 17. Wherein, the rotating shaft 3 is mounted inside the deep groove ball bearing 19 and the angular contact ball bearing 18.

[0048] In the embodiment of the present disclosure, under the support of the angular contact ball bearing 18 and the deep groove ball bearing 19, the friction received by the rotating shaft 3 is reduced, and the rotation accuracy of the rotating shaft 3 is improved.

[0049] Optionally, in combination with Figure 1 , Figure 3 and Figure 4 , a fixing ring 20 is further included. The fixing ring 20 is mounted on the rotating shaft 3 and abuts against the deep groove ball bearing 19.

[0050] In the embodiment of the present disclosure, the fixing ring 20 is mounted on the rotating shaft 3 and abuts against the deep groove ball bearing 19. The fixing ring 20 is used to axially fix the deep groove ball bearing 19, so as to avoid axial movement of the deep groove ball bearing 19.

[0051] Optionally, in combination with Figure 1 , Figure 3 and Figure 4 , a nut 21 is further included. The nut 21 is threadedly connected to the rotating shaft 3 and abuts against the angular contact ball bearing 18.

[0052] In the embodiment of the present disclosure, the nut 21 is threadedly connected to the rotating shaft 3 and abuts against the angular contact ball bearing 18. The nut 21 is used to axially fix the angular contact ball bearing 18, so as to avoid axial movement of the angular contact ball bearing 18. Meanwhile, the nut 21 cooperates with the fixing ring 20 to axially fix the rotating shaft 3.

[0053] Optionally, in combination with Figure 3 , the support frame further includes a reinforcing plate. The reinforcing plate is mounted at the connection between the first support plate 1 and the second support plate 2.

[0054] In the embodiment of the present disclosure, the support frame further includes the reinforcing plate mounted at the connection between the first support plate 1 and the second support plate 2. The reinforcing plate is used to improve the connection strength of the first support plate 1 and the second support plate 2, so as to avoid breakage or deformation of the connection between the first support plate 1 and the second support plate 2 under external force.

[0055] Optionally, in combination with Figure 1 , Figure 2 , Figure 3 and Figure 5 , the support frame further includes a base. The base is respectively mounted at the bottom surface of the four corners of the first support plate 1.

[0056] In the embodiment of the present disclosure, the support frame further includes the base respectively mounted at the bottom surface of the four corners of the first support plate 1. The base at each of the four corners is used to abut against the ground, thereby supporting the entire device.

[0057] The above description and drawings suffice to fully enable one skilled in the art to practice the embodiments of the present disclosure. Other embodiments can include structural and other changes. The embodiments are merely representative of possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included in, or substituted for, portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and can be varied in a variety of ways. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A line-laying device for engineering surveying, characterized in that, The support frame comprises a first support plate and a second support plate connected to the top surface of the first support plate, and the plane of the second support plate is perpendicular to the plane of the first support plate; a rotating shaft rotatably mounted on the second support plate along the length direction of the support frame; a reel mounted on the rotating shaft; a linear slide mounted on the top surface of the first support plate along the length direction of the support frame; a first bending plate mounted on the moving end of the linear slide along the width direction of the support frame, and the bending plate and the reel are located on both sides of the support frame; a first roller rotatably mounted on the first bending plate along the length direction of the support frame and located on both sides of the first bending plate along the height direction of the support frame; a second bending plate slidably mounted on the first bending plate; a second roller rotatably mounted on the second bending plate along the height direction of the support frame and located on both sides of the second bending plate along the length direction of the support frame, and the two second rollers and the two first rollers are arranged in a cross shape; wherein the rotating shaft is controlled to rotate to drive the reel to rotate, and the second bending plate is controlled to slide to drive the two second rollers to move up and down. Further comprising:

2. The line-throwing device for engineering surveying according to claim 1, characterized in that a guide rail mounted on the first bending plate along the height direction of the support frame; a sliding block slidably mounted on the guide rail and connected to the second bending plate. Further comprising:

3. The line-throwing device for engineering surveying according to claim 1, characterized in that an air cylinder mounted between the first bending plate and the second bending plate along the height direction of the support frame. Further comprising:

4. The line-throwing device for engineering surveying according to claim 1, characterized in that a support rod mounted on the second support plate along the length direction of the support frame; a mounting plate mounted on the support rod; a motor mounted on the mounting plate, and the axis of the rotating end of the motor is parallel to the axis of the rotating shaft; wherein the rotating shaft rotates under the drive of the motor. Further comprising:

5. The line-throwing device for engineering surveying according to claim 4, characterized in that a driving pulley mounted on the rotating end of the motor; a driven pulley mounted on the rotating shaft; a belt sleeved on the driving pulley and the driven pulley; wherein the diameter of the driving pulley is smaller than the diameter of the driven pulley. Further comprising:

6. The line-throwing device for engineering surveying according to claim 1, characterized in that a bearing seat mounted on the second support plate; opposite angular contact ball bearings mounted in the interior of the bearing seat; a deep groove ball bearing mounted in the interior of the bearing seat and located on both sides of the bearing seat along the length direction of the support frame; wherein the rotating shaft is mounted in the interior of the deep groove ball bearing and the angular contact ball bearing. Further comprising:

7. The line-throwing device for engineering surveying according to claim 6, characterized in that a fixed ring mounted on the rotating shaft and abutting against the deep groove ball bearing. Further comprising:

8. The line-throwing device for engineering surveying according to claim 6, characterized in that a nut threadedly connected to the rotating shaft and abutting against the angular contact ball bearing. The support frame further comprises:

9. The line-throwing device for engineering surveying according to any one of claims 1 to 8, characterized in that a reinforcing plate mounted at the connection between the first support plate and the second support plate; and / or a base mounted at the bottom surface of the first support plate at four corners, respectively. ​

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