Display stand for building materials

Abstract

The utility model belongs to building material technical field especially is concerned to a kind of display stand for building material.The technology includes the second side plate of horizontal arrangement, second side plate is equipped with the second slide rail of front-back direction distribution, second slide rail is equipped with fixed plate, first base and second base are provided on the fixed plate, the bottom of first base and second base is equipped with universal wheel, limit frame is installed on first base and second base, two limit frames are all processed with the first placement slot of upper and lower intercommunication, two pieces of clamping plate are arranged in the first placement slot, corresponding clamping plate is all threaded with bolt on the first placement slot, the screw inner side end of bolt located in front side is rotationally matched with the clamping plate of front side, the screw inner side end of bolt located in rear side is rotationally matched with the clamping plate of rear side.The clamping plate that can be inwards and close together makes display stand can adapt the width of plate-shaped sample, and can move the position of plate-shaped sample that has been fixed along fixed plate, facilitate to show plate-shaped sample.

Description

Technical Field

[0001] This utility model belongs to the field of building materials technology, and in particular relates to a display rack for building materials. Background Technology

[0002] The field of building materials technology is a branch of science and technology that studies the development, performance optimization, processing technology, application technology and greening of building materials, aiming to improve the functionality, safety, durability and sustainability of buildings.

[0003] Display racks for building materials are used to showcase and sell sheet-like building materials (such as floor tiles and door panels). They need to be highly visible, clearly categorized, and easy to access. They are typically designed with a multi-layered, inclined or flat structure, combined with labels to allow customers to visually compare materials, colors, and specifications, thus facilitating sales decisions. Existing display racks for building materials are functionally limited, usually only able to hold building materials of specific sizes, lacking versatility.

[0004] In the prior art, Chinese patent with publication number CN222496976U discloses a building material display rack, including an L-shaped plate. The front end of the L-shaped plate is provided with several U-shaped display racks. A baffle is fixedly installed on one side of the upper end of the U-shaped display rack, and three stop bars are fixedly installed on the other side of the interior of the U-shaped display rack. Five abutment feet are fixedly installed on the other side of the interior bottom of the U-shaped display rack. Vertical blocks are fixedly installed on both the front and rear ends of the lower end of the U-shaped display rack. Rollers are movably installed on the lower end of the vertical blocks, and a reinforcing plate is fixedly installed between two vertical blocks. Limiting sliders are fixedly installed on both sides of the reinforcing plate. Stops are fixedly installed on the upper and lower ends of the limiting sliders near the rear ends. The lower end of the L-shaped plate is flush with the lower surface of the roller.

[0005] In actual use, the position of the baffle and the abutment foot inside the U-shaped display rack is fixed, and it cannot be flexibly adjusted according to the size of the building materials. It is difficult to adapt to the diverse display needs of building materials of different sizes, and its versatility is insufficient. Utility Model Content

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a display rack for building materials that can fix building materials of different sizes.

[0007] The aforementioned building material display rack includes a second side panel arranged horizontally. A second slide rail distributed in a front-to-back direction is installed on the rear side of the second side panel. A fixing plate is horizontally installed on the second slide rail. A first base and a second base are arranged sequentially from right to left on the fixing plate, and are in left-right sliding cooperation with it. Universal wheels are installed at the bottom of the first base and the second base. Limit frames are vertically installed on the first base and the second base. The inner side walls of the two limit frames are machined with first placement grooves that are vertically connected. Two clamping plates are arranged in the first placement grooves and are spaced apart front to back. Bolts are threadedly fitted onto the front and rear groove walls of the corresponding clamping plates. The inner end of the screw of the bolt on the front side is rotatably engaged with the clamping plate on the front side, and the inner end of the screw of the bolt on the rear side is rotatably engaged with the clamping plate on the rear side.

[0008] Place the plate-shaped sample to be displayed between the front and rear clamps, and rotate the bolts connecting each clamp to the clamps to bring the front and rear clamps together, thereby fixing the plate-shaped sample. The clamps that can move inward allow the display rack to adapt to the width of the plate-shaped sample, and the position of the fixed plate-shaped sample can be moved along the fixing plate, making it convenient to display the plate-shaped sample.

[0009] Furthermore, the limiting frames are respectively mounted on the first base and the second base via vertically arranged first extension plates. The lower ends of the first extension plates are respectively mounted on the first base and the second base, and the limiting frames are rotatably mounted on the inner sidewalls of the two first extension plates facing each other.

[0010] The outer walls of the two limiting frames are laterally fixed with rotating shafts, which are rotatably engaged with the first extension plate. After the building material is fixed on the device, it can rotate along the axis of the rotating shaft to facilitate the display of the characteristics of the plate-shaped sample.

[0011] Furthermore, each of the first extension plates has a hollow structure with its opening facing downwards, and each has an independently vertically installed support plate inside. The lower ends of the two support plates are fixed to the first base and the second base, respectively. The outer walls of the two support plates are each machined with several toothed grooves distributed in the front-back direction at intervals. Each of the two first extension plates has a first pull rod inserted into its inner side. A fixing ring is fixed to each of the first extension plates corresponding to the first pull rod. A first spring is installed inside each fixing ring. The inner end of the first pull rod passes through the fixing ring and the first spring in sequence and is connected to a third limiting plate. The inner walls of the two third limiting plates are machined with grooves that mesh with the support plates. When the first spring is in a compressed state, the third limiting plate meshes with the support plate.

[0012] Pulling the two first pull rods outward compresses the first spring. The third limiting plate overcomes the elastic force of the first spring and moves outward to separate from the support plate. The first extension plate moves upward, releasing the first pull rods. The third limiting plate moves inward due to the elastic force of the first spring and engages with the support plate, thereby fixing the position of the first extension plate. This allows the display rack to adapt to plate-shaped samples of different heights, improving the practicality of the device. The first spring keeps the third limiting plate engaged with the support plate, preventing the first extension plate from slipping and improving safety.

[0013] Furthermore, the second slide rail is machined with a first slide groove distributed in the front-to-back direction. The left end of the fixing plate is located in the first slide groove and is in a front-to-back sliding fit. The upper and lower side walls of the fixing plate located in the first slide groove are provided with a second placement groove. Each of the second placement grooves is independently provided with a limit block. The bottom of the upper limit block and the top of the lower limit block are vertically provided with a second spring between them and the second placement groove. One end of the second spring is fixed to the fixing plate and the other end is fixed to the limit block. When the second spring is in a compressed state, the two limit blocks are respectively located in the first slide groove.

[0014] The outer side wall of the two limiting blocks facing each other, and the end closest to the second slide rail, is machined with a chamfer for guidance. When more fixing plates need to be installed, the fixing plates are aligned with the first slide groove on the second slide rail and moved. After the limiting blocks contact the first slide groove, they move inward against the elastic force of the second spring. When the limiting blocks are fully inserted into the second slide rail, they pop outward due to the elastic force of the second spring. When the limiting blocks are located in the first slide groove on the second slide rail, the installation of the fixing plates is completed. This simplifies the process of installing fixing plates and improves work efficiency.

[0015] Furthermore, both the second base and the first base are provided with a second sliding groove in the horizontal direction. The fixing plate and the second sliding groove are in a left-right sliding fit. The second sliding groove on the second base is open on the side facing the second slide rail. A telescopic second extension plate is provided in the fixing plate in the horizontal direction. The left end of the second extension plate is located inside the fixing plate, and the right end can slide left and right. After the second extension plate extends out of the fixing plate, it is in a left-right sliding fit with the second sliding groove, so that the first base and the second base can slide left and right along the second extension plate respectively.

[0016] The second extension plate allows the first and second bases to move a greater distance along the fixed plate. When there are multiple display racks, the display rack that needs to be displayed can be pulled out along the second extension plate and the fixed plate individually, making it convenient to display the plate-shaped samples separately.

[0017] Furthermore, the inner sidewalls of the first base and the second base are symmetrically provided with third placement slots. The bottom of the third placement slot on the second base is provided with several grooves spaced apart from left to right. A first limiting plate is hinged in the third placement slot on the first base. The right end of the first limiting plate is hinged to the first base, and the left end can swing up and down. Several locking blocks are fixed at intervals from left to right at the bottom of the first limiting plate. After the left end of the first limiting plate extends to the left into the third placement slot on the second base and swings down, the locking blocks and grooves are engaged. A pressure plate is provided in the third placement slot on the second base and above the first limiting plate. A third spring is vertically connected to the top of the pressure plate. The upper end of the third spring is fixed to the second base, and the lower end is fixed to the pressure plate. When the third spring is in a compressed state, the pressure plate presses down on the first limiting plate, and the locking blocks and grooves engage.

[0018] Move the pressure plate upward against the force of the third spring to separate the first limiting plate from the second base. Move the first base to the right and then release the pressure plate. This allows the locking block on the first limiting plate to engage with the corresponding groove in the third placement slot on the second base, thus fixing the first base. Place the plate-shaped sample between the front and rear clamping plates and move the first base to the left. The first limiting plate moves with the first base. When the outer sides of the inner walls of the two limiting frames are in contact with the left and right side walls of the plate-shaped sample, stop moving the first base. The first base can move along the second base, allowing the device to adapt to plate-shaped samples of different widths and improving its practicality.

[0019] Furthermore, a first slide rail is mounted on the second slide rail in a front-to-back direction. The first slide rail and the second slide rail slide in a front-to-back sliding fit. A first side plate is fixed laterally to the rear end of the first slide rail. A mounting plate in a front-to-back direction is fixed to the front side of the first side plate above the first slide rail. The mounting plate has a hollow structure with the opening facing forward. A third extension plate in a front-to-back direction is independently set inside the mounting plate. The front end of the third extension plate is fixed to the second side plate. The rear end of the third extension plate is located inside the mounting plate and slides in a front-to-back fit with the mounting plate. Several second toothed grooves in a vertical direction are machined at intervals on the left side wall of the third extension plate. A second pull rod is independently inserted into the left side wall of the mounting plate. The end of the second pull rod inside the mounting plate is connected to a second limiting plate. A protrusion that meshes with the second toothed groove is machined on the right side wall of the second limiting plate.

[0020] Pull the second lever to separate the second limiting plate from the third extension plate. Move the second side plate along the second slide rail. The first slide rail moves with the second side plate. After moving, push the second lever to fix the second side plate. At this time, the first slide rail and the second slide rail are extended, and more fixing plates can be added to increase the number of plate-shaped samples that can be displayed and improve the practicality of the device.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Place the building materials to be displayed between the front and rear clamps, and rotate the bolts connecting each clamp to the clamps to bring the front and rear clamps together, thus fixing the building materials. The clamps that can move inward allow the display rack to adapt to the width of the building materials, and the position of the fixed building materials can be moved along the fixed plate, making it convenient to display the building materials. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of a display rack for building materials.

[0024] Figure 2 for Figure 1 A reduced-size structural diagram after cross-section along line AA;

[0025] Figure 3 for Figure 1 Enlarged structural schematic diagram after cross-section along line BB;

[0026] Figure 4 for Figure 1 Enlarged structural diagram at point C;

[0027] Figure 5 for Figure 3 Enlarged structural diagram at point D;

[0028] Figure 6 This is a three-dimensional structural diagram of a building material display rack in use.

[0029] Figure 7 for Figure 6 Enlarged structural diagram at point F;

[0030] Figure 8 This is an exploded structural diagram of a display rack for building materials.

[0031] Reference numerals in the attached drawings: 1. First extension plate; 2. Support plate; 3. Clamping plate; 4. First side plate; 5. First pull rod; 6. First base; 7. Second extension plate; 8. Caster wheel; 9. Pressure plate; 10. Second base; 11. Fixing plate; 12. First limiting plate; 13. First slide rail; 14. Limiting block; 15. Third extension plate; 16. Second pull rod; 17. Limiting frame; 18. Mounting plate; 19. Second limiting plate; 20. Second side plate; 21. Second slide rail; 22. Third limiting plate; 23. Fixing ring. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Example

[0033] The building materials display rack described in this embodiment is implemented using the following scheme:

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the first side plate 4 is a rectangular plate structure distributed in the left-right direction. Mounting plates 18 and first slide rails 13, spaced vertically, are welded to the front side wall of the first side plate 4. The mounting plates 18 are located above the first slide rails 13. The mounting plates 18 are rectangular plate structures distributed in the front-back direction, hollow inside, with an open front side wall. The first slide rails 13 are rectangular strip structures distributed in the front-back direction, with third grooves distributed in the front-back direction and open on the right side. A second side plate 20 with the same structure is provided on the front side of the first side plate 4. A third extension plate 15 and a second slide rail 21, spaced vertically, are welded to the rear side wall of the second side plate 20. The third extension plate 15 is located above the second slide rail 21. The third extension plate 15 is a rectangular plate structure distributed in the front-to-back direction. Several second toothed grooves distributed vertically are machined at intervals on its left side wall. The third extension plate 15 is located inside the mounting plate 18, with one end of the third extension plate 15 slidingly engaging with the mounting plate 18. A circular through-hole is machined on the left side wall of the mounting plate 18, through which a cylindrical second pull rod 16 is inserted. One end of the second pull rod 16 inside the mounting plate 18 is fixed to a rectangular plate-shaped second limiting plate 19 by welding. A protrusion is machined on the right side wall of the second limiting plate 19, engaging with the second toothed grooves. The second slide rail 21 is a rectangular strip structure distributed in the front-to-back direction. First slide grooves distributed in the front-to-back direction and open on the right side are machined on the second slide rail 21. The opening size on the right side of the first slide groove is the same as the opening size on the right side of the third slide groove. The second slide rail 21 is fitted into the third groove of the first slide rail 13, and the end of the second slide rail 21 located in the first slide rail 13 slides back and forth with the first slide rail 13.

[0035] like Figure 1 , Figure 5 and Figure 8As shown, a second base 10 and a first base 6, both rectangular in structure, are sequentially arranged between the first side plate 4 and the second side plate 20. Both the first base 6 and the second base 10 are equipped with casters 8 on their bottom surfaces. A second sliding groove, penetrating to the first base 6, is machined to the right on the left side surface of the second base 10. Rectangular limiting blocks are welded to the upper and lower walls of the second base 10 at the left end of the second sliding groove. A rectangular fixing plate 11 is independently and horizontally inserted into the second sliding groove. The left end of the fixing plate 11 is inserted into the first sliding groove, and the fixing plate 11 slides back and forth with both the first slide rail 13 and the second slide rail 21. A rectangular second placement groove is machined downwards on the top surface of the left end of the fixing plate 11. Rectangular limiting blocks are welded to the top of the front and rear side walls of the second placement groove. A rectangular limiting block 14 is placed in the second placement groove, and a chamfer is machined on the top edge of the left side wall of the limiting block 14 for guidance. A rectangular plate-shaped limiting plate is welded to the bottom surface of the limiting block 14. A spring is vertically fixed between the bottom surface of the limiting plate and the bottom of the second placement groove by welding. This spring is a second spring, with one end fixed to the limiting block 14 and the other end fixed to the fixing plate 11. When the spring is compressed, the limiting block 14 is located within the second slide rail 21. A second placement groove is machined upwards on the left end of the bottom surface of the fixing plate 11, located on both the front and rear sides of the second placement groove. A rectangular limiting block is welded to the lower end of the front and rear sidewalls of the second placement groove. A limiting block 14 is placed within each of the second placement grooves. A second spring is welded between the limiting block 14 and the top of the second placement groove. One end of the second spring is fixed to the fixing plate 11, and the other end is fixed to the limiting block 14. When the second spring is compressed, the limiting block 14 is located within the second slide rail 21. The right side wall of the fixed plate 11 is machined to the left with a placement groove. A second extension plate 7 with a rectangular structure is arranged horizontally in the placement groove. The left end of the second extension plate 7 can slide along the fixed plate 11. A rectangular limiting block is fixed to the right side of the second extension plate 7 by welding. After the right end of the second extension plate 7 extends out of the fixed plate 11, it slides left and right with the second slide groove, so that the first base 6 and the second base 10 can slide left and right along the second extension plate 7 respectively.

[0036] like Figure 1 , Figure 6 and Figure 7As shown, both the first base 6 and the second base 10 have rectangular third placement slots extending outwards from their opposite surfaces and above the fixing plate 11. The bottom of the third placement slot on the second base 10 has several right-angled grooves distributed in a front-to-back direction and spaced apart on the left and right sides, with the right-angled ends of these grooves facing left. A rectangular fixing block is welded to the bottom of the third placement slot on the first base 6. A rectangular mounting groove with an open top surface is machined on the left side of the fixing block, and pivots distributed in a front-to-back direction are welded to this mounting groove. The front and rear ends of the pivots are fixed to the front and rear side walls of the fixing block, respectively. A rectangular plate-like first limiting plate 12 is placed in the third placement slot of the second base 10. The bottom of the first limiting plate 12 has a groove that engages with the right-angled triangular groove in the third placement slot on the second base 10. The groove wall of this groove serves as a locking block that engages with the right-angled triangular groove. A connecting block is welded to the right end of the first limiting plate 12. The connecting block has a circular through hole that runs from front to back. This through hole is fitted onto the pivot of the fixing block in the third placement slot on the first base 6, so that the first base 6 and the first limiting plate 12 are hinged together. The front side wall of the third placement slot on the second base 10 has a rectangular notch that runs from front to back. A rectangular plate-like pressure plate 9 is installed in the rectangular notch. A third spring is vertically installed between the pressure plate 9 and the second base 10. The upper end of the third spring is fixed to the second base 10, and the lower end is fixed to the pressure plate 9. When the spring is in a compressed state, the locking block on the first limiting plate 12 engages with the corresponding groove in the third placement slot on the second base 10.

[0037] like Figure 1 , Figure 4 and Figure 6As shown, the top surfaces of both the first base 6 and the second base 10 are welded with support plates 2 that are rectangular in shape and distributed vertically. The outer walls of both support plates 2 are machined with first toothed grooves distributed in the front-back direction. Each support plate 2 has a first extension plate 1 that is rectangular in shape and distributed vertically. The first extension plate 1 is hollow inside with an open bottom surface, and the support plate 2 is independently inserted into the first extension plate 1. The outer walls of both first extension plates 1 are machined with circular through holes that connect horizontally. A circular shell-shaped fixing ring 23 is welded into each of the two through holes. Both fixing rings 23 are hollow inside with open opposite sides, and a circular through hole that connects horizontally is machined at the center of their outer walls. A cylindrical first tie rod 5 is horizontally inserted into each of these circular through holes. Both first pull rods 5 have rectangular plate-shaped third limiting plates 22 welded to their inner ends within the first extension plate 1. The inner walls of both third limiting plates 22 have protrusions that mesh with the first toothed grooves on the support plate 2. Each of the first pull rods 5 within the two fixing rings 23 is fitted with a first spring, one end of which is fixed to the fixing ring 23, and the other end to the third limiting plate 22. When the first spring is compressed, the third limiting plate 22 engages with the support plate 2.

[0038] like Figure 1 , Figure 6 and Figure 8 As shown, each of the two first extension plates 1 has a rotating shaft connected to its center at the top and bottom of its opposite surface. Each of the two rotating shafts has a rectangular limiting frame 17, arranged vertically, fixed to its opposite surface by welding. The inner sides of the two limiting frames 17 have first placement grooves that are vertically connected. The limiting frames 17 on the front and rear walls of the first placement grooves have threaded holes that are vertically connected. Bolts are inserted into these threaded holes. Rectangular plate-like clamping plates 3 are connected to the inner ends of the two bolts, which are located within the limiting frames 17. The screw of the front bolt is rotatably connected to the front clamping plate 3, and the screw of the rear bolt is also rotatably connected to the rear clamping plate 3.

[0039] The specific instructions for using the above technical solution are as follows:

[0040] Move the device outside the placement position, pull the second pull rod 16 to separate the second limiting plate 19 from the third extension plate 15, move the second side plate 20 along the mounting plate 18 so that the first side plate 4 and the second side plate 20 fit against the front and rear side walls of the placement position, move the device to the left, and when the second pull rod 16 hits the wall, the second limiting plate 19 engages with the third extension plate 15, thereby fixing the second side plate 20 and fixing the device to the wall.

[0041] The second slide rail 21 moves along the first slide rail 13 due to the movement of the second side plate 20. At this time, the fixing plate 11 can be aligned with the first slide groove on the second slide rail 21 and moved. After the limiting block 14 contacts the first slide groove, it moves inward against the elastic force of the second spring. When the limiting block 14 is fully inserted into the second slide rail 21, it pops outward due to the elastic force of the second spring. When the limiting block 14 is located in the first slide groove on the second slide rail 21, the fixing plate 11 is installed.

[0042] When it is necessary to fix clamps 3 of different sizes, push the pressure plate 9 upward. The pressure plate 9 moves upward against the elastic force of the third spring. Rotate the first limiting plate 12 along the pivot to separate the first limiting plate 12 from the second base 10. Move the first base 6 to the right along the second base 10 to the size of the plate sample. Release the pressure plate 9. The pressure plate 9 engages the first limiting plate 12 with the second base 10 due to the elastic force of the third spring, thus fixing the first base 6. Pull the first pull rod 5 to separate the third limiting plate 22 from the support plate 2 against the elastic force of the first spring. Move the first extension plate 1 upward. The limiting frame 17 moves with the first extension plate 1. When the clamp 3 is located at the center of the upper and lower positions of the front and rear side walls of the plate sample, stop moving the first extension plate 1. Move the first base 6 to the left. The limiting frame 17 moves with the first base 6 to fix the right side wall of the plate sample. Rotate the bolt that is rotatably engaged with the clamp 3. The anti-slip surface of the clamp 3 adheres to the front and rear side walls of the clamp 3 as the bolt rotates, thus fixing the plate sample.

[0043] When it needs to be displayed separately;

[0044] Pull the first base 6 to be displayed, and the first base 6 and the second base 10 move to the right. The second extension plate 7 extends along the fixed plate 11. When the plate sample does not interfere with other plate samples, stop pulling the first base 6. At this time, the limiting frame 17 can be rotated along the pivot, and the first pull rod 5 can be pulled to move the limiting frame 17 up and down, so that the display of the clamp 3 is clearer.

[0045] The effects of the above solution:

[0046] The first extension plate 1 can move upward along the support plate 2, the first base 6 can move to the right along the second extension plate 7 and the fixed plate 11, and the two limiting frames 17 can be adjusted to the appropriate size of the clamping plate 3 as the first base 6 and the first extension plate 1 move. The clamping plate 3 on the limiting frame 17 can adapt to clamping plates 3 of different thicknesses, so that the device can adapt to more plate-shaped samples of more sizes and increase the practicality of the device.

[0047] The third extension plate 15 and the second slide rail 21 can move along the mounting plate 18 and the first slide rail 13 respectively, so that the device can adapt to placement positions of various sizes, avoid gaps between the device and the placement position caused by improper installation, and improve the practicality of the device.

Claims

1. A display rack for building materials, comprising a second side panel (20) arranged laterally, a second slide rail (21) distributed in a front-rear direction is installed on the rear side of the second side panel (20), and a fixing plate (11) is installed laterally on the second slide rail (21), characterized in that: The fixed plate (11) is provided with a first base (6) and a second base (10) that slide with it from right to left. The bottom of the first base (6) and the second base (10) are both equipped with casters (8). The first base (6) and the second base (10) are both vertically equipped with limit frames (17). The inner sidewalls of the two limit frames (17) are machined with first placement grooves that are connected vertically. The first placement grooves are provided with two clamping plates (3) that are spaced apart front and back. The clamping plates (3) are threaded with bolts on the front and back groove walls of the first placement groove. The inner end of the screw of the bolt on the front side is rotatably connected with the clamping plate (3) on the front side, and the inner end of the screw of the bolt on the rear side is rotatably connected with the clamping plate (3) on the rear side.

2. The display rack for building materials according to claim 1, characterized in that: The limiting frames (17) are respectively installed on the first base (6) and the second base (10) by the vertically arranged first extension plate (1). The lower end of the first extension plate (1) is respectively installed on the first base (6) and the second base (10). The limiting frames (17) are rotatably installed on the inner sidewalls opposite to the two first extension plates (1).

3. The display rack for building materials according to claim 2, characterized in that: The first extension plate (1) is a hollow structure with the opening facing downward. Each of the two support plates (2) is independently and vertically installed inside. The lower ends of the two support plates (2) are fixed to the first base (6) and the second base (10) respectively. The outer side walls of the two support plates (2) are each machined with several first toothed grooves distributed in the front-back direction at intervals. The outer side walls of the two first extension plates (1) are each independently fitted with a first pull rod (5). The first pull rod (5) is fixed with a fixing ring (23) on the first extension plate (1). The fixing ring (23) is provided with a first spring. The inner end of the first pull rod (5) passes through the fixing ring (23) and the first spring in sequence and is connected to a third limiting plate (22). The inner side walls of the two third limiting plates (22) are machined with protrusions that mesh with the support plate (2). When the first spring is in a compressed state, the third limiting plate (22) meshes with the support plate (2).

4. The display rack for building materials according to claim 3, characterized in that: The second slide rail (21) is machined with a first slide groove distributed in the front-back direction. The left end of the fixing plate (11) is located in the first slide groove and is in a front-back sliding fit. The upper and lower side walls of the fixing plate (11) located in the first slide groove are provided with a second placement groove. Each of the second placement grooves is independently provided with a limit block (14). The bottom of the upper limit block (14) and the top of the lower limit block (14) are vertically provided with a second spring between them and the second placement groove. One end of the second spring is fixed to the fixing plate (11) and the other end is fixed to the limit block (14). When the second spring is in a compressed state, the two limit blocks (14) are located in the first slide groove respectively.

5. The display rack for building materials according to claim 4, characterized in that: The second base (10) and the first base (6) are both provided with a second sliding groove in the horizontal direction. The fixing plate (11) is in a left-right sliding fit with the second sliding groove. The second sliding groove on the second base (10) is open on the side facing the second slide rail (21). A telescopic second extension plate (7) is provided in the fixing plate (11) in the horizontal direction. The left end of the second extension plate (7) is located in the fixing plate (11), and the right end can slide left and right. After the second extension plate (7) extends out of the fixing plate (11), it is in a left-right sliding fit with the second sliding groove, so that the first base (6) and the second base (10) can slide left and right along the second extension plate (7) respectively.

6. The display rack for building materials according to claim 5, characterized in that: The first base (6) and the second base (10) have symmetrically arranged third placement slots on their inner sidewalls. The bottom of the third placement slot on the second base (10) has several grooves spaced apart on the left and right. A first limiting plate (12) is hinged in the third placement slot on the first base (6). The right end of the first limiting plate (12) is hinged to the first base (6), and the left end can swing up and down. Several locking blocks are fixed at intervals on the left and right sides at the bottom of the first limiting plate (12). After the left end of the block extends to the left into the third placement groove on the second base (10) and swings downward, the block engages with the groove. A pressure plate (9) is provided in the third placement groove on the second base (10) and above the first limiting plate (12). A third spring is vertically connected to the top of the pressure plate (9). The upper end of the third spring is fixed to the second base (10), and the lower end is fixed to the pressure plate (9). When the third spring is in a compressed state, the pressure plate (9) presses down on the first limiting plate (12), and the block engages with the groove.

7. The display rack for building materials according to claim 6, characterized in that: The second slide rail (21) is fitted with a first slide rail (13) distributed in the front-back direction. The first slide rail (13) and the second slide rail (21) slide in a front-back sliding fit. The rear end of the first slide rail (13) is laterally fixed with a first side plate (4). The front side of the first side plate (4) above the first slide rail (13) is fixed with a mounting plate (18) distributed in the front-back direction. The mounting plate (18) has a hollow structure with the opening facing forward. The mounting plate (18) is independently provided with a third extension plate (15) distributed in the front-back direction. The front end of the third extension plate (15) is... Fixed to the second side plate (20), the rear end of the third extension plate (15) is located inside the mounting plate (18) and is in a sliding fit with the mounting plate (18). Several second toothed grooves distributed in the vertical direction are machined at intervals on the left side wall of the third extension plate (15). A second pull rod (16) is independently installed inward on the left side wall of the mounting plate (18). One end of the second pull rod (16) located inside the mounting plate (18) is connected to a second limiting plate (19). A protrusion that meshes with the second toothed groove is machined on the right side wall of the second limiting plate (19).

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