A demonstration device for the structural hierarchy of building materials
By designing a construction material structure hierarchical demonstration device including a mobile car and a multi-function display section, the problem of unintuitive and inconvenient demonstration in the prior art is solved, and the sample is conveniently stored and intuitively displayed, supporting detailed observation and tool storage.
Patent Information
- Application Number
- CN202210422387.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-04-21
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2042-04-21
AI Technical Summary
The demonstration method of building materials structural level in the prior art lacks intuitiveness and convenience, and lacks a unified demonstration device, resulting in inconvenience in searching and storage.
A building material structure hierarchical demonstration device including a mobile car, a layered demonstration unit, a tool storage unit, a top display unit and a lighting amplification unit is designed. Sample storage and display are realized through a sliding demonstration rack and a movable demonstration board, and the lighting amplification function is equipped.
It realizes convenient storage and display of building material structural layer samples, provides intuitive demonstration effects, and supports detailed observation and tool storage, improving the convenience of use and display effects.
Smart Images

Figure CN114724450B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a demonstration device, and more particularly to a demonstration device for the structural hierarchy of building materials. Background Art
[0002] Building construction refers to the selection of materials and their practices for each component of a building based on scientific principles. Its task is to select a reasonable construction plan according to the requirements of the building's function, material properties, stress conditions, construction methods, and building image. Building materials are the foundation of a building and can be divided into structural materials, decorative materials, and certain special materials. Structural materials include wood, bamboo, stone, cement, concrete, metal, bricks, tiles, ceramics, glass, engineering plastics, composite materials, etc.; decorative materials include various coatings, paints, coatings, veneers, various colored tiles, glass with special effects, etc.; special materials refer to materials used for waterproofing, moisture-proofing, anti-corrosion, fire prevention, flame retardancy, sound insulation, heat insulation, thermal insulation, sealing, etc. In order to achieve multiple functions, many building materials are composite materials. In order for people to better understand a certain building material, it is often necessary to display its cross-section in layers.
[0003] Currently, there are two ways to demonstrate the structural hierarchy of building materials: one is to make a model and draw the materials of each layer on the cross-section of the model. Since the layers are drawn, the specific structural composition cannot be intuitively displayed; the other is to draw a wall chart of the structural hierarchy, which also has the problem of being abstract and not intuitive.
[0004] In addition to the above two methods, there are also cases where the building materials are directly cut off and their structural hierarchies are demonstrated, but there is no corresponding demonstration device, and they are all scattered, making it very inconvenient to search and store. Summary of the Invention
[0005] The present invention provides a demonstration device for the structural hierarchy of building materials, which can be moved as a whole. The samples of the structural hierarchy of building materials are fixed on the movable demonstration boards of each layer of the sliding demonstration rack. It can not only be stored in the storage box, but also be horizontally pulled out for demonstration, and can also be taken off separately and placed on the top of the device for observing the details with a magnifying glass in an auxiliary lighting environment; various tools for demonstration are stored in the device at the same time, and it is convenient to take samples and tools.
[0006] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions:
[0007] A demonstration device for the structural hierarchy of building materials, comprising a mobile cart, a hierarchical demonstration unit, a tool storage unit, a top display unit and a lighting and magnification unit; the bottom of the mobile cart is provided with rollers, and a main frame is arranged on the mobile cart; the hierarchical demonstration unit is arranged in the main frame, the hierarchical demonstration unit is provided with a storage box, and a multi-layer sliding demonstration rack is arranged in the contraction box. Each layer of the sliding demonstration rack can move to the outside of the storage box, and movable demonstration boards are detachably arranged on each layer of the sliding demonstration rack respectively, and samples of the structural hierarchy of building materials are fixed on the movable demonstration boards; the tool storage unit is arranged at one end of the mobile cart away from the storage box, and comprises a storage rack and a support frame. A multi-layer storage board is arranged in the storage rack for placing tools used during the demonstration, and a multi-layer support board is arranged on the support frame. Each layer of the support board is arranged corresponding to each layer of the sliding demonstration rack, and one end of the sliding demonstration rack moved out of the storage box can be supported on the corresponding support board; both the top display unit and the lighting and magnification unit are arranged on the top of the main frame; the top display unit consists of two groups of parallel display rods, and both groups of display rods can slide along the top of the main frame. After the movable demonstration board is removed from the sliding demonstration rack, it can be fixed on the top display rack composed of two groups of display rods; the lighting and magnification unit is provided with a lighting lamp and a magnifying glass, and both the lighting lamp and the magnifying glass are slidably connected to the main frame through sliding rods.
[0008] The mobile cart is composed of a vehicle body, rollers and a handlebar; the handlebar is arranged at one end of the vehicle body and consists of a push rod and two connecting rods. One ends of the two connecting rods are fixedly connected to the corresponding ends of the push rod, and the other ends of the two connecting rods are respectively connected to the main frame.
[0009] The main frame is composed of two inverted U-shaped brackets, and the two brackets are relatively arranged on both sides of the vehicle body. The bottom parts of the vertical rods at both ends of the brackets are respectively fixedly connected to the vehicle body through bolts; the connecting rods at both ends of the handlebar are respectively connected to the vertical rods of the corresponding side brackets.
[0010] The storage box is composed of a box body and fixing and positioning rods; one end of the box body facing the inside of the main frame is not closed, and fixing and positioning rods are respectively arranged on both sides of the box body at the corresponding end; storage box positioning holes are respectively arranged on both sides of the vehicle body, and the bottom ends of the fixing and positioning rods are inserted into the corresponding storage box positioning holes; the top plate and the three side plates of the box body are made of transparent PVC plates.
[0011] The sliding demonstration rack is composed of a sliding plate and a movable demonstration board. Positioning short rods are arranged at the four corners of the bottom of the movable demonstration board, sliding plate positioning holes are correspondingly arranged at the four corners of the top of the sliding plate, and the positioning short rods on the movable demonstration board are inserted into the corresponding sliding plate positioning holes of the corresponding sliding plate; a push-pull plate is arranged on the movable demonstration board at the opening side of the corresponding box body; sliding grooves are arranged on both sides of the box body corresponding to each layer of the sliding plate, and the sliding plate slides along the corresponding sliding grooves.
[0012] The support frame is composed of support rods and multiple layers of support plates; both ends of the support plates are connected to the corresponding support rods through sleeves, and the sleeves and the support rods are fixed through fixing bolts; support frame positioning holes are provided on the vehicle body, the bottom ends of the support rods are inserted into the support frame positioning holes, and rubber rings are provided at the insertion joints; a connecting plate is provided at the top of the support frame, holes are provided on the connecting plate for inserting the support rods, and the connecting plate is fixedly connected to the storage rack; a support block is provided between the bottom of the support frame and the storage rack.
[0013] The display rod is composed of a load-bearing rod, two connecting pipes, two sliding sockets and a rubber strip. Connecting pipes are respectively provided at both ends of the load-bearing rod, and the connecting pipes are sleeved on the cross bars of the corresponding side brackets; the sliding socket is composed of a sliding sleeve and an inserting pipe, the sliding sleeve is sleeved on the load-bearing rod, and the pipe orifice size of the inserting pipe matches the size of the positioning short rod on the movable demonstration board; a rubber strip is fixedly provided at the top of the load-bearing rod between the two sliding sockets.
[0014] The lighting and magnifying part is composed of a sliding rod, a lighting lamp and a magnifying glass. Sliding connecting pipes are provided at both ends of the sliding rod, the sliding connecting pipes are sleeved on the cross bars of the corresponding side brackets and can be locked through locking bolts; both the lighting lamp and the magnifying glass are arranged on one side of the sliding rod close to the top display part; the lighting lamp is composed of a lamp holder and lighting lamp beads, one end of the lamp holder is fixedly connected to the sliding rod, and multiple lighting lamp beads are provided on the lamp holder; the magnifying glass is connected to the sliding rod through a shaped metal hose.
[0015] The roller is a universal wheel.
[0016] The positioning short rod is a PVC rod with a length of 3 - 5 cm.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] 1) The layered demonstration part is provided with a storage box and a sliding demonstration rack. The building material structure layer samples are fixed on the movable demonstration board, and the movable demonstration board is inserted and fixed with the sliding board. During use, the building material structure layer samples can either be stored in the storage box or be horizontally pulled out for demonstration; the movable demonstration board is inserted and fixed with the sliding board, which is convenient for installation, disassembly and replacement, and is beneficial for maintenance and cleaning;
[0019] 2) The building material structure layer samples and the corresponding movable demonstration boards can also be separately removed and placed on the top of the device, which is convenient for separately demonstrating one of the samples or key parts during the demonstration process;
[0020] 4) Support plates are correspondingly arranged on the support frame one by one with the movable demonstration boards. During the demonstration process, the end of the sliding demonstration rack that moves out of the storage box can be supported on the corresponding support plate, preventing the movable demonstration board from tilting or being damaged due to the overweight of the sample;
[0021] 5) A movable lighting magnifying part is provided, which can be moved as a whole to the side of the sample placed on the top during the demonstration, and the observer can observe the subtle details of the sample through a magnifying glass (the macroscopic structure of the building material refers to the coarse tissue that can be distinguished by the naked eye or a magnifying glass); the magnifying glass is connected to the load-bearing rod through a shaped metal hose, and the magnifying glass can be suspended at any position for easy observation and recording;
[0022] 6) A tool storage area is provided to facilitate demonstration with a variety of tools during the demonstration;
[0023] 7) The top display part consists of two sets of parallel and slidable display rods. The spacing between the display rods is adjustable, and there are plug-in tubes that match the short positioning rods on the movable demonstration board. The movable demonstration board with the sample of the structural layer of building materials fixed can be easily and quickly installed on the top of the device; a rubber strip is set on the top of the display rod to play a role in supporting, shock absorbing and maintaining stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of a building material structural layer demonstration device according to the present invention (the front side plate in the illustrated direction is removed to show the internal structure of the storage box).
[0025] Figure 2 It is a structural schematic diagram of the sliding demonstration stand of the present invention.
[0026] Figure 3 It is a structural schematic diagram of the tool storage portion of the present invention.
[0027] Figure 4 It is a structural schematic diagram of the display rod of the present invention.
[0028] Figure 5 It is a structural schematic diagram of the illumination amplifying part of the present invention.
[0029] In the figure: 1. Car body 2. Roller 3. Fixed positioning rod 4. Support frame positioning hole 5. Storage box 6. Sliding demonstration frame 61. Sliding plate 62. Push-pull plate 63. Sliding plate positioning hole 64. Positioning short rod 65. Movable demonstration board 7. Tool storage part 71. Support rod 72. Sleeve 73. Support plate 74. Fixing bolt 75. Storage rack 76. Connecting plate 77. Support block 78. Storage board 8. Display rod 81. Connecting pipe 82. Load-bearing rod 83. Sliding sleeve 84. Insertion pipe 85. Rubber strip 9. Lighting magnifying part 91. Sliding rod 92. Sliding connecting pipe 93. Locking bolt 94. Shaped metal hose 95. Magnifying glass 96. Lamp holder 97. Lighting lamp beads 10. Vertical pole 11. Crossbar 12. Bolt 14. Connecting rod 15. Push rod DETAILED DESCRIPTION
[0030] The following further describes the specific implementation manners of the present invention in conjunction with the accompanying drawings:
[0031] As Figure 1 shown, a demonstration device for the structural hierarchy of building materials according to the present invention includes a mobile trolley, a hierarchical demonstration part, a tool storage part 7, a top display part, and a lighting and magnification part 9; rollers 2 are provided at the bottom of the mobile trolley, and a main frame is provided on the mobile trolley; the hierarchical demonstration part is arranged within the main frame, and the hierarchical demonstration part is provided with a storage box 5, and a multi-layer sliding demonstration rack 6 is arranged in the retractable box 5. Each layer of the sliding demonstration rack 6 can be moved to the outside of the storage box 5, and movable demonstration boards 65 are detachably arranged on each layer of the sliding demonstration rack 6, and samples of the structural hierarchy of building materials are fixed on the movable demonstration boards 65; the tool storage part 7 is arranged at one end of the mobile trolley away from the storage box 5, and includes a storage rack 75 and a support frame. Multiple storage boards 78 are arranged in the storage rack 75 for placing tools used during the demonstration. Multiple support boards 73 are arranged on the support frame, and each layer of the support boards 73 is arranged corresponding to each layer of the sliding demonstration rack 6. One end of the sliding demonstration rack 6 moved out of the storage box 5 can be supported on the corresponding support board 73; both the top display part and the lighting and magnification part 9 are arranged on the top of the main frame; the top display part is composed of 2 groups of parallel display rods 8, and both 2 groups of display rods 8 can slide along the top of the main frame. After the movable demonstration board 65 is removed from the sliding demonstration rack 6, it can be fixed on the top display rack composed of 2 groups of display rods 8; the lighting and magnification part 9 is provided with a lighting lamp and a magnifying glass 95, and both the lighting lamp and the magnifying glass 95 are slidably connected to the main frame through sliding rods 91.
[0032] The mobile trolley is composed of a vehicle body 1, rollers 2, and a handlebar; the handlebar is arranged at one end of the vehicle body 1 and is composed of a push rod 15 and 2 connecting rods 14. One ends of the 2 connecting rods 14 are fixedly connected to the corresponding ends of the push rod 15, and the other ends of the 2 connecting rods 14 are respectively connected to the main frame.
[0033] The main frame is composed of 2 inverted U-shaped brackets, and the 2 brackets are relatively arranged on both sides of the vehicle body 1. The bottom parts of the vertical rods 10 at both ends of the brackets are respectively fixedly connected to the vehicle body 1 through bolts 12; the connecting rods 14 at both ends of the handlebar are respectively connected to the vertical rods 10 of the corresponding side brackets.
[0034] The storage box 5 is composed of a box body and fixing and positioning rods 3; one end of the box body facing the inside of the main frame is not closed, and fixing and positioning rods 3 are respectively arranged on both sides of the box body at the corresponding end; storage box positioning holes are respectively arranged on both sides of the vehicle body 1, and the bottom ends of the fixing and positioning rods 3 are inserted into the corresponding storage box positioning holes; the top plate and three side plates of the box body are all made of transparent PVC plates.
[0035] As Figure 2As shown in the figure, the sliding demonstration rack 6 is composed of a sliding plate 61 and a movable demonstration plate 65. Positioning short rods 64 are provided at the four corners of the bottom of the movable demonstration plate 65, and corresponding sliding plate positioning holes 63 are provided at the four corners of the top of the sliding plate 61. The positioning short rods 64 on the movable demonstration plate 65 are inserted into the corresponding sliding plate positioning holes 63 of the corresponding sliding plate 61. A push-pull plate 62 is provided on the movable demonstration plate 65 on the opening side corresponding to the box body. Sliding grooves are provided on both sides of the box body corresponding to each layer of the sliding plate 61, and the sliding plate 61 slides along the corresponding sliding grooves.
[0036] As Figure 3 As shown in the figure, the support frame is composed of support rods 71 and multiple support plates 73. Both ends of the support plate 73 are connected to the corresponding support rods 71 through sleeves 72, and the sleeves 72 and the support rods 71 are fixed through fixing bolts 74. Support frame positioning holes 4 are provided on the vehicle body 1, and the bottom ends of the support rods 71 are inserted into the support frame positioning holes 4, and rubber rings are provided at the insertion joints. A connecting plate 76 is provided at the top of the support frame, and holes are provided on the connecting plate 76 for inserting and connecting with the support rods 71. The connecting plate 76 is fixedly connected to the storage rack 75. A support block 77 is provided between the bottom of the support frame and the storage rack 75.
[0037] As Figure 4 As shown in the figure, the display rod 8 is composed of a load-bearing rod 82, two connecting pipes 81, two sliding sockets and a rubber strip 85. Connecting pipes 81 are provided at both ends of the load-bearing rod 82, and the connecting pipes 81 are sleeved on the cross bars 11 of the corresponding side brackets. The sliding socket is composed of a sliding sleeve 83 and an insertion connecting pipe 84. The sliding sleeve 83 is sleeved on the load-bearing rod 82, and the pipe orifice size of the insertion connecting pipe 84 matches the size of the positioning short rod 64 on the movable demonstration plate 65. A rubber strip 85 is fixedly provided at the top of the load-bearing rod 82 between the two sliding sockets.
[0038] As Figure 5 As shown in the figure, the lighting and magnifying part 9 is composed of a sliding rod 91, a lighting lamp and a magnifying glass 95. Sliding connecting pipes 92 are provided at both ends of the sliding rod 91. The sliding connecting pipes 92 are sleeved on the cross bars 11 of the corresponding side brackets and can be locked through locking bolts 93. Both the lighting lamp and the magnifying glass 95 are arranged on one side of the sliding rod 91 close to the top display part. The lighting lamp is composed of a lamp holder 96 and lighting lamp beads 97. One end of the lamp holder 96 is fixedly connected to the sliding rod 91, and multiple lighting lamp beads 97 are provided on the lamp holder 96. The magnifying glass 95 is connected to the sliding rod 91 through a shaped metal hose 94.
[0039] The roller 2 is a universal wheel.
[0040] The positioning short rod 64 is a PVC rod with a length of 3 - 5 cm.
[0041] The working principle of the building material structure layer demonstration device of the present invention is as follows:
[0042] During use, push the handlebar to move the entire device to a suitable position; pull the push-pull plate 62 to pull out the corresponding sliding plate 61 from the storage box 5, place the pulled-out end on the corresponding support plate 73, fix the sample of the building material structure layer for demonstration on the movable demonstration board 65, and then push the push-pull plate 62 again to push the sliding demonstration rack 6 with the building material structure layer sample installed back into the storage box 5. When the building material structure layer samples are fixed on each layer of the sliding demonstration rack 6, it is ready for demonstration.
[0043] During the demonstration process, as needed, pull out one layer of the sliding demonstration rack 6 alone from the storage box 5 for display, or pull out each layer of the sliding demonstration rack 6 in a stepped manner (i.e., the pulled-out length decreases successively from bottom to top) for display.
[0044] When it is necessary to observe a building material structure layer sample in detail or conduct a key demonstration, after pulling out the corresponding sliding demonstration rack 6, remove the movable demonstration board 65 and the building material structure layer sample thereon from the sliding plate 61, and then adjust the two display rods 8 to a suitable position and install the movable demonstration board 65 on the top display rack composed of the two display rods 8.
[0045] If the light at the demonstration site is insufficient or it is necessary to focus on illuminating and observing fine parts, loosen the locking bolt 93 and move the lighting and magnifying part 9 as a whole towards one end of the top display rack; light the lighting bead 97 for illumination, move the magnifying glass 95 through the shaped metal hose 94 and adjust the angle of the magnifying glass 95, and then the local details of the building material structure layer sample can be further observed. The shaped metal hose 94 can make the magnifying glass 95 hover at the adjusted position, facilitating the observer to take pictures or make records with a pen.
[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.
Claims
1. A demonstration device for the structural hierarchy of building materials, characterized in that, It includes a mobile trolley, a layered demonstration part, a tool storage part, a top-mounted display part and a lighting and magnifying part; rollers are provided at the bottom of the mobile trolley, and a main frame is provided on the mobile trolley; the layered demonstration part is arranged inside the main frame, the layered demonstration part is provided with a storage box, and a multi-layer sliding demonstration rack is arranged in the contraction box. Each layer of the sliding demonstration rack can move to the outside of the storage box, and movable demonstration boards are detachably arranged on each layer of the sliding demonstration rack respectively, and samples of the structural levels of building materials are fixed on the movable demonstration boards; the tool storage part is arranged at one end of the mobile trolley away from the storage box, and includes a storage rack and a support frame. Multiple storage boards are arranged inside the storage rack for placing tools used during the demonstration. Multiple support boards are arranged on the support frame, and each layer of the support board is arranged corresponding to each layer of the sliding demonstration rack. One end of the sliding demonstration rack moved out of the storage box can be supported on the corresponding support board; both the top-mounted display part and the lighting and magnifying part are arranged on the top of the main frame; the top-mounted display part is composed of 2 groups of parallel display rods, and both 2 groups of display rods can slide along the top of the main frame. After the movable demonstration board is removed from the sliding demonstration rack, it can be fixed on the top display rack composed of 2 groups of display rods; the lighting and magnifying part is provided with a lighting lamp and a magnifying glass, and both the lighting lamp and the magnifying glass are slidably connected to the main frame through sliding rods; The storage box is composed of a box body and fixing positioning rods; one end of the box body facing the inside of the main frame is not closed, and fixing positioning rods are respectively arranged on both sides of the box body at the corresponding end; storage box positioning holes are respectively arranged on both sides of the vehicle body, and the bottom ends of the fixing positioning rods are inserted into the corresponding storage box positioning holes; the top plate and three side plates of the box body are made of transparent PVC plates; The sliding demonstration rack is composed of a sliding plate and a movable demonstration board. Positioning short rods are arranged at the four corners of the bottom of the movable demonstration board, and sliding plate positioning holes are correspondingly arranged at the four corners of the top of the sliding plate. The positioning short rods on the movable demonstration board are inserted into the corresponding sliding plate positioning holes of the corresponding sliding plate; a push-pull plate is arranged on the movable demonstration board at the opening side corresponding to the box body; sliding grooves are arranged on both sides of the box body corresponding to each layer of the sliding plate, and the sliding plate slides along the corresponding sliding grooves.
2. The demonstration device for the structural hierarchy of a building material according to claim 1, wherein The mobile trolley is composed of a vehicle body, rollers and a handlebar; the handlebar is arranged at one end of the vehicle body and is composed of a push rod and 2 connecting rods. One ends of the 2 connecting rods are fixedly connected to the corresponding ends of the push rod, and the other ends of the 2 connecting rods are respectively connected to the main frame.
3. The demonstration device for the structural hierarchy of a building material according to claim 1, characterized in that, The main frame is composed of 2 inverted U-shaped brackets, and the 2 brackets are relatively arranged on both sides of the vehicle body. The bottom parts of the vertical rods at both ends of the brackets are respectively fixedly connected to the vehicle body through bolts; the connecting rods at both ends of the handlebar are respectively connected to the vertical rods of the corresponding side brackets.
4. The demonstration device for the construction layer structure of a building material according to claim 1, characterized in that, The support frame is composed of a support rod and multiple support boards; both ends of the support board are connected to the corresponding support rod through sleeves, and the sleeves and the support rod are fixed through fixing bolts; support frame positioning holes are arranged on the vehicle body, and the bottom end of the support rod is inserted into the support frame positioning holes, and a rubber ring is arranged at the insertion part; a connecting plate is arranged at the top of the support frame, and a hole is arranged on the connecting plate for inserting the support rod, and the connecting plate is fixedly connected to the storage rack; a support block is arranged between the bottom of the support frame and the storage rack.
5. The demonstration device for the structural hierarchy of a building material according to claim 1, characterized in that, The display rod is composed of a load-bearing rod, two connecting pipes, two sliding sockets and a rubber strip. Connecting pipes are respectively arranged at both ends of the load-bearing rod, and the connecting pipes are sleeved on the cross bars of the corresponding side brackets; the sliding socket is composed of a sliding sleeve and an insertion pipe. The sliding sleeve is sleeved on the load-bearing rod, and the pipe orifice size of the insertion pipe matches the size of the positioning short rod on the movable demonstration board; a rubber strip is fixedly arranged at the top of the load-bearing rod between the two sliding sockets.
6. The demonstration device for the construction level of a building material according to claim 1, characterized in that, The lighting and magnifying part is composed of a sliding rod, a lighting lamp and a magnifying glass. Sliding connecting pipes are arranged at both ends of the sliding rod. The sliding connecting pipes are sleeved on the cross bars of the corresponding side brackets and can be locked by locking bolts; both the lighting lamp and the magnifying glass are arranged on one side of the sliding rod close to the top display part; the lighting lamp is composed of a lamp holder and lighting lamp beads. One end of the lamp holder is fixedly connected to the sliding rod, and multiple lighting lamp beads are arranged on the lamp holder; the magnifying glass is connected to the sliding rod through a shaped metal hose.
7. The demonstration device for the structural hierarchy of a building material according to claim 1 or 2, characterized in that The roller is a universal wheel.
8. The demonstration device for the structural hierarchy of a building material according to claim 1 or 5, characterized in that, The positioning short rod is a PVC rod with a length of 3 - 5 cm.
Citation Information
Patent Citations
Demonstration device for construction layers of building materials
CN218038371U