Truss girder assembly tool

Abstract

The utility model relates to the technical field of truss girder assembly, in particular to a truss girder assembly tool which comprises a working table, a transverse rod limiting plate, a vertical rod limiting plate and an inclined rod limiting plate, and the transverse rod limiting plate, the vertical rod limiting plate and the inclined rod limiting plate are fixedly arranged at the top of the working table. At least two transverse rod limiting plates are arranged in parallel, transverse rod limiting grooves are formed in the transverse rod limiting plates in the axial direction, and transverse rods of the truss girder are placed in the transverse rod limiting grooves; a plurality of vertical rod limiting plates and inclined rod limiting plates are sequentially arranged between the transverse rod limiting plates, vertical rod limiting grooves are formed in the vertical rod limiting plates in the axial direction of the vertical rod limiting plates, vertical rods of truss girders are placed in the vertical rod limiting grooves, inclined rod limiting grooves are formed in the inclined rod limiting plates in the axial direction of the inclined rod limiting plates, and inclined rods of the truss girders are placed in the inclined rod limiting grooves. The transverse rod limiting groove, the vertical rod limiting groove and the inclined rod limiting groove are communicated; labor can be reduced, the fatigue degree of operators can be reduced, the assembling uniformity of truss girders can be improved or guaranteed, and potential quality hazards of products can be reduced or eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of truss beam assembly, and more specifically, to a truss beam assembly tooling. Background Art

[0002] A truss beam assembly is composed of two cross bars, multiple vertical bars, multiple diagonal bars, flanges at the ends, and longitudinally connecting flanges by welding.

[0003] Traditional assembly is carried out manually. During the assembly process, operators have to spend a lot of effort to complete the assembly. The fatigue degree of the operators is very high, and the assembly force and standards controlled by each worker cannot reach unity, resulting in potential quality hazards for the products. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a truss beam assembly tooling, which can reduce labor, lower the fatigue degree of operators, improve or ensure the assembly uniformity of truss beams, and reduce or eliminate potential quality hazards of products.

[0005] The technical solution of the utility model is realized as follows:

[0006] A truss beam assembly tooling includes a workbench, a cross bar limiting plate, a vertical bar limiting plate, and a diagonal bar limiting plate fixedly arranged on the top of the workbench.

[0007] At least two cross bar limiting plates are provided and arranged in parallel. The cross bar limiting plates are axially provided with cross bar limiting grooves, and the cross bar limiting grooves are used for placing the cross bars of the truss beam.

[0008] A number of the vertical bar limiting plates and the diagonal bar limiting plates are arranged in sequence between the cross bar limiting plates. The vertical bar limiting plates are axially provided with vertical bar limiting grooves, and the vertical bar limiting grooves are used for placing the vertical bars of the truss beam. The diagonal bar limiting plates are axially provided with diagonal bar limiting grooves, and the diagonal bar limiting grooves are used for placing the diagonal bars of the truss beam. And the cross bar limiting grooves, the vertical bar limiting grooves and the diagonal bar limiting grooves are communicated with each other.

[0009] Further, an end flange positioning plate is arranged at the end of the cross bar limiting plate, and the end flange positioning plate is used for installing the flanges at both ends of the truss beam.

[0010] Further, the end flange positioning plate is vertically arranged on the workbench, and the bolt holes on the end flange positioning plate correspond one by one to the holes on the flange.

[0011] Further, a longitudinally connecting flange positioning plate is also arranged on the workbench, and the longitudinally connecting flange positioning plate is used for installing the longitudinally connecting flange of the truss beam.

[0012] Further, a flange quick clamp is provided at the top of the workbench and corresponding to the flange of the truss beam. The connecting plate of the flange quick clamp is fixed to the workbench, and the telescopic rod of the flange quick clamp is used to tightly press against the flange of the truss beam.

[0013] Further, the number of the flange quick clamps is the same as that of the cross-bar limit plates, and the flange quick clamps are arranged at the same end of the cross-bar limit plates.

[0014] Further, a plurality of cross-bar quick clamps are provided at the top of the workbench. The connecting plate of the cross-bar quick clamp is fixed to the workbench, and the telescopic rod of the cross-bar quick clamp is used to tightly press against the cross-bar of the truss beam and fix the cross-bar of the truss beam in the cross-bar limit groove.

[0015] Further, the vertical rod limit plate is divided into a first vertical rod limit plate and a second vertical rod limit plate. The cross-section of the vertical rod limit groove on the first vertical rod limit plate is semicircular and is used for placing a circular vertical rod;

[0016] The cross-section of the vertical rod limit groove on the second vertical rod limit plate is U-shaped and is used for placing a square vertical rod.

[0017] Further, two cross-bar limit plates are provided.

[0018] Further, the top surface of the workbench is a plane, and a plurality of support rods are provided at the bottom of the workbench.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] This application provides a truss beam assembly tooling. According to the positions and arrangements of the cross-bars, vertical rods and diagonal rods on the truss beam in the drawing, the cross-bar limit plates, vertical rod limit plates and diagonal rod limit plates are correspondingly arranged on the workbench according to the drawing. Correspondingly, the cross-bars are placed in the cross-bar limit grooves of each cross-bar limit plate, the vertical rods are placed in the vertical rod limit grooves of each vertical rod limit plate, and the diagonal rods are placed in the diagonal rod limit grooves of each diagonal rod limit plate to achieve their positioning. Among them, the lengths of a plurality of diagonal rods are not the same. The two ends of the diagonal rod respectively abut against two adjacent cross-bars, and the two ends of the vertical rod also respectively abut against two adjacent cross-bars. Then, all the joints of the cross-bars, vertical rods and diagonal rods are welded by an operator or a welding robot to complete the assembly of the truss beam. Since the cross-bar limit plates, vertical rod limit plates and diagonal rod limit plates are all fixed and equivalent to a mold, therefore, when assembling each truss beam, only the cross-bars, vertical rods and diagonal rods need to be correspondingly placed and welded, which can reduce the manual labor intensity and the fatigue degree of the operator. At the same time, it can also improve or ensure the assembly uniformity of the truss beam (each assembled truss beam is basically the same or exactly the same, with uniform dimensions), and reduce or eliminate the quality hidden dangers of the product. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a top view of the truss beam assembly tooling of the present invention;

[0023] Figure 2 It is a front view of the truss beam assembly tooling of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the top view and the front view of the truss beam assembly tooling of the present invention placed in proportion on one piece;

[0025] Figure 4 It is a structural schematic diagram of the flange quick clamp of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the cross-bar quick clamp of the present invention.

[0027] In the figure:

[0028] 1 - Workbench; 2 - End flange positioning plate; 3 - Cross-bar limiting plate; 4 - First vertical rod limiting plate; 5 - Second vertical rod limiting plate; 6 - Diagonal rod limiting plate; 7 - Longitudinal connection flange positioning plate; 8 - Flange quick clamp; 801 - Connecting plate of the flange quick clamp; 802 - Telescopic rod of the flange quick clamp; 9 - Cross-bar quick clamp. 901 - Connecting plate of the cross-bar quick clamp; 902 - Telescopic rod of the cross-bar quick clamp. Detailed Embodiments

[0029] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0031] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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 situations.

[0035] The following will describe in detail some embodiments of the present utility model in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0036] Embodiment

[0037] Refer to Figures 1 - 3, this embodiment provides a truss beam assembly tooling, including a workbench 1, a cross-bar limiting plate 3 fixedly arranged on the top of the workbench 1, a vertical-bar limiting plate, and an inclined-bar limiting plate 6; preferably, the workbench 1 is a rectangular plate-like structure, the top surface of the workbench 1 is the working surface, and the working surface is a plane. The truss beam includes a cross bar, a vertical bar, and an inclined bar.

[0038] A number of the vertical-bar limiting plates and the inclined-bar limiting plates 6 are arranged in sequence between the cross-bar limiting plates 3. Specifically, the cross-bar limiting plate 3, the vertical-bar limiting plate, and the inclined-bar limiting plate 6 are correspondingly installed at the corresponding positions on the working surface according to the positions and arrangements on the drawing, and the cross-bar limiting plate 3, the vertical-bar limiting plate, and the inclined-bar limiting plate 6 are vertically arranged on the workbench 1. Among them, the arrangement of the cross-bar limiting plate 3 is arranged according to the arrangement of the cross bar on the drawing, the arrangement of the vertical-bar limiting plate is arranged according to the arrangement of the vertical bar on the drawing, and the arrangement of the inclined-bar limiting plate 6 is arranged according to the arrangement of the inclined bar on the drawing. Generally speaking, the cross-bar limiting plate 3, the vertical-bar limiting plate, and the inclined-bar limiting plate 6 on this assembly tooling are arranged, placed, and fixed according to the self-structure of the truss beam.

[0039] At least two cross-bar limiting plates 3 are provided and arranged in parallel with each other. The cross-bar limiting plate 3 is provided with a cross-bar limiting groove along its axial direction, and the cross-bar limiting groove is used for placing the cross bar of the truss beam. Specifically, the cross-bar limiting groove is opened on the top surface of the cross-bar limiting plate 3.

[0040] A number of vertical-bar limiting plates and inclined-bar limiting plates 6 are arranged between two adjacent cross-bar limiting plates 3. As Figure 1 shown, the cross-bar limiting plate 3, the vertical-bar limiting plate, and the inclined-bar limiting plate 6 are arranged in sequence. The vertical-bar limiting plate is provided with a vertical-bar limiting groove along its axial direction, the vertical-bar limiting groove is used for placing the vertical bar of the truss beam, the inclined-bar limiting plate is provided with an inclined-bar limiting groove along its axial direction, the inclined-bar limiting groove is used for placing the inclined bar of the truss beam, and the cross-bar limiting groove, the vertical-bar limiting groove, and the inclined-bar limiting groove are communicated with each other. Specifically, the vertical-bar limiting groove is opened on the top surface of the vertical-bar limiting plate, the inclined-bar limiting groove is opened on the top surface of the inclined-bar limiting plate 6, and the openings of the cross-bar limiting groove, the vertical-bar limiting groove, and the inclined-bar limiting groove all face upward, which is convenient for placing the cross bar, the vertical bar, and the inclined bar.

[0041] The truss beam is composed of two cross bars, multiple vertical bars, multiple diagonal bars, flanges at the ends, and longitudinal connecting flanges welded together. In the prior art, the cross bars, vertical bars, diagonal bars, flanges at the ends, and longitudinal connecting flanges were all assembled and welded manually one by one without the aid of a teaming tooling. In this application, even if only the cross bar limiting plate 3, the vertical bar limiting plate, and the diagonal bar limiting plate 6 are used to achieve the pairing of the cross bars, vertical bars, and diagonal bars, although only the unified pairing of a part of the structure in the truss beam is completed, compared with the prior art, it can reduce the manual labor amount and at least improve the unified assembly of the cross bars, vertical bars, and diagonal bars in the truss beam, that is, at least improve the degree of unity of this part of the structure (the degree of unity is the degree of unified assembly). For the remaining part in the truss beam (such as the flanges at the ends and the longitudinal connecting flanges), the operator needs to assemble and weld them one by one.

[0042] Based on this, in this embodiment, only two cross bar limiting plates 3 are arranged on the workbench 1. An end flange positioning plate 2 is arranged at the end of the cross bar limiting plate 3. The end flange positioning plate 2 is used to install the flanges at both ends of the truss beam. A longitudinal connecting flange positioning plate 7 is also arranged on the workbench 1. The longitudinal connecting flange positioning plate 7 is used for the installation of the longitudinal connecting flanges of the truss beam. It should be noted that the end flange positioning plate 2 and the longitudinal connecting flange positioning plate 7 are also arranged according to the layout of the flanges at the ends and the longitudinal connecting flanges in the truss beam in the drawing. Specifically, the layout of the end flange positioning plate 2 and the longitudinal connecting flange positioning plate 7 is as Figure 1 shown.

[0043] The longitudinal connecting flange positioning plate 7 and the end flange positioning plate 2 are vertically arranged on the workbench 1. The end flange positioning plate 2 is provided with a plurality of bolt holes. The bolt holes on the end flange positioning plate 2 correspond to and are coaxial with the holes on the flange one by one.

[0044] At the top of the workbench 1 and corresponding to the flanges of the truss beam, a flange quick clamp 8 is provided. The connecting plate 801 of the flange quick clamp is fixed to the workbench 1. The telescopic rod 802 of the flange quick clamp is used to press against the flange at the end of the truss beam, so as to fix the flange at the end of the truss beam.

[0045] The number of the flange quick clamps 8 is the same as the number of the cross bar limiting plates 3, that is, two flange quick clamps 8 are provided, and the two flange quick clamps 8 are arranged at the same end of the two cross bar limiting plates 3, as Figure 1 shown.

[0046] A plurality of cross bar quick clamps 9 are arranged at the top of the workbench 1. The connecting plate 901 of the cross bar quick clamp is fixed to the workbench 1. The telescopic rod 902 of the cross bar quick clamp is used to press against the cross bar of the truss beam and fix the cross bar of the truss beam in the cross bar limiting groove. Specifically, as Figure 1, four pieces of the crossbar quick clamps 9 are arranged on each side of the truss (both sides in the longitudinal direction).

[0047] It should be noted that the flange quick clamps 8 and the crossbar quick clamps 9 adopt the same quick clamps. The structure of the quick clamps includes a connecting plate and a telescopic rod, as Figure 4 and Figure 5 shown.

[0048] Specifically, the vertical rod limiting plate is divided into a first vertical rod limiting plate 4 and a second vertical rod limiting plate 5. The cross-section of the vertical rod limiting groove on the first vertical rod limiting plate 4 is semicircular or arc-shaped, and the diameter of the semicircle or arc is the same as the diameter of the circular vertical rod for placing the circular vertical rod or the round tube vertical rod. The cross-section of the vertical rod limiting groove on the second vertical rod limiting plate 5 is U-shaped. The U-shaped groove includes a first vertical surface, a first flat surface, and a second vertical surface connected in sequence. The first vertical surface and the second vertical surface are parallel to each other and perpendicular to the first flat surface respectively. The width of the first flat surface is equal to the width of the square vertical rod for placing the square vertical rod or the square tube vertical rod.

[0049] The principle of the truss beam assembly tooling of the present application is as follows:

[0050] The flanges at both ends of the truss beam are arranged on the end flange positioning plate 2 with pin shafts. The crossbar of the truss beam is placed in the crossbar limiting groove of the crossbar limiting plate 3, and the crossbar is fixed to the crossbar limiting plate 3 through the crossbar quick clamp 9; the longitudinal connecting flange of the truss beam is arranged on the longitudinal connecting flange positioning plate 7 and fixed with a pin shaft; the circular vertical rods, square vertical rods, and diagonal rods of the truss beam are sequentially placed in the vertical rod limiting grooves of the first vertical rod limiting plate 4, the vertical rod limiting grooves of the second vertical rod limiting plate 5, and the diagonal rod limiting grooves of the diagonal rod limiting plate 6; then the worker performs welding according to the requirements. After the assembly is completed, the crossbar quick clamp 9, the flange quick clamp 8, and the pin shafts for limiting are loosened, and the finished product is taken out. In this way, the quality and size of the assembled truss beam assembly are unified and meet the customer's requirements. Through this truss beam assembly tooling, manual labor can be reduced, the fatigue degree of operators can be reduced, the assembly uniformity of the truss beam can be improved or ensured, and the quality hidden dangers of the product can be reduced or eliminated.

[0051] It should be noted that: during the above welding operation, automatic welding can also be performed by a welding robot. Since the positions of each welding joint are fixed during welding, the welding can be completed by setting a program in the welding robot to replace manual labor (the specific structure of the welding robot here is not described in detail as a supplementary explanation).

[0052] The beneficial effects of the technical solution of the present utility model are:

[0053] The present application provides a truss beam assembly tooling. According to the positions and arrangements of the cross bars, vertical bars, diagonal bars, end flanges and longitudinal connection flanges on the truss beam in the drawing, the cross bar limit plates 3, vertical bar limit plates, diagonal bar limit plates 6, end flange positioning plates 2 and longitudinal connection flange positioning plates 7 are correspondingly arranged on the workbench 1 according to the drawing. Correspondingly, the cross bars are placed in the cross bar limit grooves of each cross bar limit plate 3, the vertical bars are placed in the vertical bar limit grooves of each vertical bar limit plate, the diagonal bars are placed in the diagonal bar limit grooves of each diagonal bar limit plate 6, the end flanges are placed on the end flange positioning plates 2, and the longitudinal connection flanges are placed on the longitudinal connection flange positioning plates 7 to achieve the positioning of each component in the truss beam. Then, the operator or the welding robot welds all the joints of the cross bars, vertical bars, diagonal bars, end flanges and longitudinal connection flanges to complete the assembly of the truss beam; the assembly tooling is equivalent to a mold for batch production. Therefore, when assembling each truss beam, only by correspondingly placing the cross bars, vertical bars, diagonal bars, end flanges and longitudinal connection flanges and welding them to each other, the manual labor amount can be reduced and the fatigue degree of the operator can be lowered. At the same time, the assembly uniformity of the truss beam can be improved or ensured (each assembled truss beam is basically the same or exactly the same, with unified dimensions), and the quality hidden dangers of the product can be reduced or eliminated.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

[0055] In addition, those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the above claims, any one of the claimed embodiments can be used in any combination. The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A truss beam assembly tool, characterized in that: It comprises a workbench (1), a horizontal bar limiting plate (3) fixedly arranged on the top of the workbench (1), a vertical bar limiting plate, and an inclined bar limiting plate (6); At least two crossbar limiting plates (3) are provided and are arranged parallel to each other. The crossbar limiting plates (3) are provided with crossbar limiting grooves along their axial directions. The crossbar limiting grooves are used to place the crossbars of the truss beams. A plurality of the vertical bar limiting plates and the diagonal bar limiting plates (6) are arranged in sequence between the horizontal bar limiting plates (3); the vertical bar limiting plates are provided with vertical bar limiting grooves along their axial directions, and the vertical bar limiting grooves are used to place the vertical bars of the truss beams; the diagonal bar limiting plates (6) are provided with diagonal bar limiting grooves along their axial directions, and the diagonal bar limiting grooves are used to place the diagonal bars of the truss beams; and the horizontal bar limiting grooves, the vertical bar limiting grooves and the diagonal bar limiting grooves are connected.

2. The truss beam assembly tool according to claim 1, characterized in that: An end flange positioning plate (2) is provided at the end of the crossbar limiting plate (3), and the end flange positioning plate (2) is used to install the flanges at both ends of the truss beam.

3. The truss beam assembly tool according to claim 2, characterized in that: The end flange positioning plate (2) is vertically arranged on the workbench (1), and the bolt holes on the end flange positioning plate (2) correspond one to one with the holes on the flange.

4. The truss beam assembly tool according to claim 1, characterized in that: A longitudinal connection flange positioning plate (7) is also arranged on the workbench (1), and the longitudinal connection flange positioning plate (7) is used for installing the longitudinal connection flange of the truss beam.

5. The truss beam assembly tool according to claim 1, characterized in that: A flange quick clamp (8) is arranged on the top of the workbench (1) and at the flange corresponding to the truss beam, the connecting plate of the flange quick clamp (8) is fixed to the workbench (1), and the telescopic rod of the flange quick clamp (8) is used to tighten the flange of the truss beam.

6. The truss beam assembly tool according to claim 5, characterized in that: The number of the flange quick clamps (8) is the same as the number of the cross bar limiting plates (3), and the flange quick clamps (8) are arranged at the same end of the cross bar limiting plates (3).

7. The truss beam assembly tool according to claim 1, characterized in that: A plurality of crossbar quick clamps (9) are arranged on the top of the workbench (1); the connecting plates of the crossbar quick clamps (9) are fixed to the workbench (1); and the telescopic rods of the crossbar quick clamps (9) are used to press against the crossbars of the truss beams and fix the crossbars of the truss beams in the crossbar limiting grooves.

8. The truss beam assembly tool according to claim 1, characterized in that: The vertical pole limiting plate is divided into a first vertical pole limiting plate (4) and a second vertical pole limiting plate (5); the vertical pole limiting groove on the first vertical pole limiting plate (4) has a semicircular cross section and is used for placing a circular vertical pole; The cross section of the vertical pole limiting groove on the second vertical pole limiting plate (5) is U-shaped and is used for placing a square vertical pole.

9. The truss beam assembly tool according to claim 8, characterized in that: The number of the crossbar limiting plates (3) is two.

10. The truss beam assembly tool according to claim 1, characterized in that: The top surface of the workbench (1) is a plane, and a plurality of supporting rods are arranged at the bottom of the workbench (1).

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