Space-adjustable compact shelf

Abstract

The compact shelf with the adjustable space comprises a square-shaped main compact shelf body, and a square-shaped auxiliary compact shelf body which can be far away from or close to the square-shaped main compact shelf body is installed on the outer wall of one side of the square-shaped main compact shelf body. A first upper rack and a second upper rack are installed at the top ends of the square-shaped main compact shelf and the square-shaped auxiliary compact shelf respectively in a lifting mode. Synchronous space expansion in the horizontal direction and the vertical direction is achieved, when large articles need to be stored or the storage number needs to be increased, the storage capacity can be improved through horizontal expansion, when small articles need to be stored or classified management needs to be conducted, the storage flexibility can be improved through the lifting function, the space utilization mode is flexible, and the space utilization efficiency is improved. According to the compact shelving, the storage efficiency is greatly improved, and due to the fact that the arrangement quantity of the single compact shelving in the horizontal direction is reduced, the assembly process of the compact shelving in the same area can be simpler and more convenient only by controlling the distance between the adjacent compact shelving.

Description

Technical Field

[0001] The invention relates to the technical field of compact shelving, in particular to a compact shelving with adjustable space. Background Art

[0002] Height-adjustable compact shelving is a device used to store and manage documents, books, archives and other items. It is widely used in archives, libraries, offices and industrial sites. Its main function is to effectively utilize space, increase storage capacity, and meet different storage needs by adjusting the height. It is usually composed of a stable frame, a convenient adjustment mechanism, durable shelves, a stable base and a guide system. The frame of the shelf is made of high-strength steel or aluminum alloy to ensure its stability and durability; the adjustment mechanism usually uses a slot and latch design, so that users can easily adjust the height of the shelf to meet the storage needs of different items. In addition, some compact shelving units are also equipped with a locking system and anti-theft design to improve the safety of stored items; such as a height-adjustable compact shelving disclosed in the authorization announcement number CN114886236B, including a compact shelving, a material rack, a fixed rod, a handle, a lifting mechanism and an adjustment mechanism, six material racks are evenly slidably arranged inside the compact shelving, handles are slidably arranged at the lower part of the left and right sides of the compact shelving, fixed rods are arranged on the inner side of the handles, and the fixed rods are connected to the left and right sides of the material rack, a lifting mechanism is arranged on the lower side of the compact shelving, and an adjustment mechanism is arranged on the upper part of the left and right sides of the compact shelving, which can be pulled upward By moving the handle, the material rack moves upward, and then the compact shelving moves upward, and then the movable plate rotates downward, the height of the compact shelving can be adjusted. However, the above technical solution mainly utilizes the lifting mechanism to control the overall height of the compact shelving during use. At this time, the internal space of the compact shelving can be expanded in the vertical direction, but the horizontal available space of the compact shelving has not been expanded. The user still needs to increase the layout of the compact shelving to expand the horizontal space of the compact shelving, that is, on the same horizontal plane, the number of compact shelving must be increased or its layout must be adjusted. This also leads to that when storage demand increases, the user will find that even if the vertical space can be increased, the overall storage capacity is still restricted by the ceiling height. At this time, the design of the compact shelving becomes invalid to a certain extent and cannot meet the growing storage demand. Summary of the invention

[0003] The purpose of the present invention is to provide a space-adjustable compact shelving, wherein a first upper frame and a second upper frame that can be lifted and lowered are respectively installed on the top of the square-mouthed main compact shelving and the square-mouthed auxiliary compact shelving, when the rotary drive unit and the screw expansion module pull the square-mouthed auxiliary compact shelving and the second upper frame to move horizontally, the horizontal accommodation space of the square-mouthed main compact shelving and the square-mouthed auxiliary compact shelving is expanded, and at the same time, a part of the rotary power of the rotary drive unit and the screw expansion module is transmitted to the double-sprocket lifting structure through the pulley transmission structure, and the double-sprocket lifting structure enables the first upper frame and the second upper frame to be lifted and lowered, so that the internal space of the compact shelving is synchronously expanded in the horizontal and vertical directions, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a compact shelving with adjustable space, comprising: A square-mouthed main compact rack, on one side of the outer wall of the square-mouthed main compact rack is installed a square-mouthed sub-compact rack that can be away from or close to the square-mouthed main compact rack, the tops of the square-mouthed main compact rack and the square-mouthed sub-compact rack are respectively installed with a first upper frame and a second upper frame in a lifting manner, one end of the second upper frame extends to the inside of the first upper frame and is slidably matched with the first upper frame; A screw extension module, which is arranged at the bottom end of the square-mouthed main compact rack and is used to drive the square-mouthed sub-compact rack to move away from or close to the square-mouthed main compact rack. A rotating drive unit for driving the screw extension module is installed on one side of the bottom end of the square-mouthed main compact rack. A T-shaped shaft plate is fixed at an edge position on one side of the bottom of the square-mouthed main compact rack, and a pulley transmission structure and a bevel gear transmission structure are respectively arranged on the outer walls on both sides of the T-shaped shaft plate; Axle frames, two of which are installed on the inner wall of the same side of the square-mouthed main compact rack, and a double-sprocket lifting structure for pushing the first upper rack and the second upper rack to lift and slide is provided on the outer wall of one side of the two axle frames, and the double-sprocket lifting structure maintains power connection with the screw expansion module through a bevel gear transmission structure and a pulley transmission structure, and a motor controller is installed on one side of the surface of the square-mouthed main compact rack, and the output end of the motor controller is electrically connected to the input end of the rotation drive unit.

[0005] Preferably, a plurality of right-angle sheet metal parts are installed at equal intervals in the vertical direction on the left and right inner walls of the square-mouthed main compact rack and the square-mouthed auxiliary compact rack.

[0006] Preferably, the square-mouthed secondary compact rack consists of a side frame and four square-mouthed arms, the square-mouthed arms are slidably installed inside the square-mouthed main compact rack, one end of the square-mouthed arm passes through the outside of the square-mouthed main compact rack, and the side frame is fixed to the same end of the four square-mouthed arms.

[0007] Preferably, the screw expansion module includes a base plate fixed to the bottom end of the square-mouthed main compact rack, bearing seats installed on the left and right sides of the bottom end of the base plate, a screw unit rotatably installed between the two bearing seats, and a nut pair installed at the threaded part at one end of the surface of the screw unit, the top of the nut pair slidingly cooperates with the bottom end of the base plate, the screw expansion module also includes a slide slidably installed on the front and rear sides of the bottom end of the base plate and a connecting beam fixed on the outer wall of one side of the slide, the end of the connecting beam away from the slide is fixedly connected to the bottom end of the side frame, a connecting plate is fixed between the nut pair and the relative outer walls of the slide, the rotation drive unit adopts a reduction motor, and the output end of the reduction motor is fixedly connected to one end of the screw unit through a coupling.

[0008] Preferably, dovetail guide rails are fixed on both sides of the bottom end of the base plate, a sliding sleeve is installed on the upper surface of the slide, the sliding sleeve and the dovetail guide rail are fixedly connected, and a circular sleeve is installed at the end of the connecting beam away from the slide, and the circular sleeve is fixedly connected to the bottom end of the side frame.

[0009] Preferably, the pulley transmission structure includes a middle shaft rotatably mounted at one end inside the T-axis plate and a synchronous wheel fixed at the same end of the middle shaft and the screw rod, and a multi-V belt is installed between the two synchronous wheels in the vertical direction.

[0010] Preferably, the double sprocket lifting structure includes an upper longitudinal axis, a lower longitudinal axis, and a sprocket plate fixed at both ends of the upper longitudinal axis and the lower longitudinal axis rotatably installed between the two shaft frames, a chain is installed between the two sprocket plates in the same vertical direction, one end of the chain is fixed with a U-shaped arm extending upward and fixedly connected to the top of the first upper frame, and the power connection between the lower longitudinal axis and the middle shaft is maintained by a bevel gear transmission structure.

[0011] Preferably, the bevel gear transmission structure includes a driving bevel gear fixed to one end of the middle shaft and a driven bevel gear fixed to one end of the lower longitudinal shaft surface, and the driven bevel gear and the driving bevel gear are meshed with each other.

[0012] Preferably, foot supports are installed at the corners of the bottom ends of the side frames.

[0013] Preferably, two bends are provided on one side outer wall of the U-shaped arm, and the U-shaped arm is slidably matched with the shaft frame through the bends.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the space-adjustable compact shelving is designed with a square-mouthed main compact shelving and a square-mouthed auxiliary compact shelving, and a first upper rack and a second upper rack that can be lifted and lowered are installed on the top respectively. Combined with the operation of the rotary drive unit, the screw expansion module, the pulley transmission structure, the bevel gear transmission structure, and the double sprocket lifting structure, the synchronous expansion of the space in the horizontal and vertical directions is realized. When larger items need to be stored or the storage quantity needs to be increased, the storage capacity can be increased through horizontal expansion, and when smaller items need to be stored or classified management is required, the lifting function can improve the storage flexibility. Its flexible space utilization method greatly improves the storage efficiency. Moreover, since the horizontal arrangement amount of a single compact shelving is reduced, it is only necessary to control the spacing between adjacent compact shelving to make the assembly process of the compact shelving in the same area easier. Reducing the number of components means that the overall structure is simpler, and users can complete tasks more quickly during installation, reducing the risk of errors caused by complex assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 4 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ; Figure 5 The three-dimensional structure of the present invention is shown in FIG. Figure 4 ; Figure 6 This is a schematic diagram of the three-dimensional structure of a square-mouthed auxiliary compact rack according to the second embodiment of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the screw extension module according to the third embodiment of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the double-sprocket lifting structure of the fourth embodiment of the present invention.

[0016] In the figure: 1. square-mouthed main compact rack; 2. square-mouthed auxiliary compact rack; 201. side frame; 202. square-mouthed support arm; 3. first upper frame; 4. second upper frame; 5. bottom plate; 6. right-angle sheet metal; 7. rotary drive unit; 8. screw extension module; 801. bearing seat; 802. screw single body; 803. nut pair; 804. slide; 805. connecting beam; 9. T-axis plate; 10. pulley transmission structure; 1001. middle shaft; 1002. synchronous wheel; 1003. multi-V belt; 11. shaft frame; 12. double sprocket lifting structure; 1201. upper longitudinal axis; 1202. lower longitudinal axis; 1203. sprocket disc; 1204. chain; 13. U-arm; 14. motor controller; 15. bevel gear transmission structure. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1, by Figures 1 to 5 The present invention comprises a square-mouthed main compact rack 1, on one side outer wall of the square-mouthed main compact rack 1 is installed a square-mouthed sub-compact rack 2 which can be away from or close to the square-mouthed main compact rack 1, the tops of the square-mouthed main compact rack 1 and the square-mouthed sub-compact rack 2 are respectively installed with a first upper frame 3 and a second upper frame 4 in a lifting manner, one end of the second upper frame 4 extends to the inside of the first upper frame 3 and is slidably matched with the first upper frame 3; A screw extension module 8 is arranged at the bottom end of the square-mouthed main compact rack 1, and is used to drive the square-mouthed secondary compact rack 2 to move away from or close to the square-mouthed main compact rack 1. A rotating drive unit 7 for driving the screw extension module 8 is installed on one side of the bottom end of the square-mouthed main compact rack 1. A T-shaped shaft plate 9 is fixed at an edge position on one side of the bottom of the square-mouthed main compact rack 1, and a pulley transmission structure 10 and a bevel gear transmission structure 15 are respectively arranged on the outer walls of both sides of the T-shaped shaft plate 9; Axle frames 11, two axle frames 11 are installed on the inner wall of the same side of the square-mouthed main compact rack 1, and a double-sprocket lifting structure 12 for pushing the first upper frame 3 and the second upper frame 4 to lift and slide is arranged on the outer wall of one side of the two axle frames 11. The double-sprocket lifting structure 12 maintains power connection with the screw expansion module 8 through the bevel gear transmission structure 15 and the pulley transmission structure 10. The pulley transmission structure 10 and the bevel gear transmission structure 15 can maintain stable performance during long-term use, reduce the need for frequent replacement of parts, and thus reduce the subsequent maintenance cost of the compact rack; A motor controller 14 is installed on one side of the surface of the square-mouthed main compact rack 1, and the output end of the motor controller 14 is electrically connected to the input end of the rotation drive unit 7; On the left and right inner walls of the square-mouthed main compact shelving 1 and the square-mouthed auxiliary compact shelving 2, a number of right-angled sheet metal parts 6 are installed at equal intervals in the vertical direction. The right-angled sheet metal parts 6 on the inner walls of the square-mouthed main compact shelving 1 and the square-mouthed auxiliary compact shelving 2 can be used to place shelves. Such shelves are flat parts for placing items. Their materials are generally steel plates or wooden boards. They can bear a large weight, and the number and height of the shelves can be adjusted as needed to accommodate items of different types and sizes. On the inner walls of the first upper rack 3 and the second upper rack 4, the right-angled sheet metal parts 6 can also be arranged horizontally and one by one in a detachable manner to facilitate the placement of items at a higher position.

[0019] Embodiment 2, based on embodiment 1, Figure 6 It is given that the square-mouthed sub-dense rack 2 is composed of a side frame 201 and four square-mouthed arms 202. A foot support is installed at the corner position of the bottom end of the side frame 201. In order to ensure that the square-mouthed sub-dense rack 2 can be smoothly moved horizontally, the foot support at the bottom end can be replaced with a Fumar wheel to facilitate its horizontal sliding; The square-mouth support arm 202 is slidably installed inside the square-mouth main compact shelving 1, and one end of the square-mouth support arm 202 extends to the outside of the square-mouth main compact shelving 1. The side frame 201 is fixed to the same end of the four square-mouth support arms 202. When the screw expansion module 8 drives the square-mouth sub-compact shelving 2 to gradually move away from the square-mouth main compact shelving 1, the square-mouth support arm 202 will move a part of it out of the inner cavity of the square-mouth profile of the square-mouth main compact shelving 1. The square-mouth design of the square-mouth main compact shelving 1 and the square-mouth sub-compact shelving 2 allows the shelves to be arranged more compactly when placed and combined, reducing the gaps between shelves. This can save space to the maximum extent when storing a large number of documents, archives or books, and is convenient for expanding storage space in the future.

[0020] Embodiment 3, based on embodiment 2, Figure 7It is given that the screw extension module 8 includes a bottom plate 5 fixed to the bottom end of the square-mouthed main dense rack 1, a bearing seat 801 installed on the left and right sides of the bottom end of the bottom plate 5, a screw single body 802 rotatably installed between the two bearing seats 801, and a nut pair 803 installed at the threaded part of one end of the surface of the screw single body 802, the top end of the nut pair 803 is slidably matched with the bottom end of the bottom plate 5, the screw extension module 8 also includes a slide 804 slidably installed on the front and rear sides of the bottom end of the bottom plate 5 and a connecting beam 805 fixed on the outer wall of one side of the slide 804, the end of the connecting beam 805 away from the slide 804 is fixedly connected to the bottom end of the side frame 201, a connecting plate is fixed between the nut pair 803 and the relative outer walls of the slide 804, and the rotation drive unit 7 adopts a reduction motor, the reduction The output end of the motor is fixedly connected to one end of the screw rod unit 802 through a coupling. During the operation of the screw rod extension module 8, the rotary power of the rotation drive unit 7 will be directly transmitted to the screw rod unit 802, and the screw rod unit 802 will drive the nut pair 803, the slide 804 and the connecting beam 805 to move right or left in the X-axis direction. When the nut pair 803 is driven to move right, the connecting beam 805 will drive the side frame 201 and the square-mouth support arm 202 to gradually move away from the square-mouth main compact rack 1, so that the combined length of the square-mouth main compact rack 1 and the square-mouth auxiliary compact rack 2 can be adjusted, which helps to expand the horizontal space area between the two, ensuring that the user can easily adjust the horizontal length of the rack to meet the storage needs of items of different sizes; The design of the screw rod monomer 802 can effectively disperse the load, improve the stability of the frame under high load conditions, and reduce the risk of tipping. This feature ensures that the structure remains stable and reliable when heavy objects are stored in the compact shelving; Dovetail guide rails are fixed on both sides of the bottom end of the base plate 5, and a sliding sleeve is installed on the upper surface of the slide 804. The sliding sleeve and the dovetail guide rail are fixedly connected. A circular sleeve is installed at the end of the connecting beam 805 away from the slide 804. The circular sleeve is fixedly connected to the bottom end of the side frame 201. The slide 804 and the connecting beam 805 are slidably matched with the bottom end of the square-mouth main compact shelving 1 through the dovetail guide rails and the sliding sleeve, so that the two connecting beams 805 can be stably moved forward by the nut pair 803.

[0021] Embodiment 4, based on embodiment 3, Figure 8It is given that the pulley transmission structure 10 includes a middle shaft 1001 rotatably mounted at one end of the T-axis plate 9 and a synchronous wheel 1002 fixed at the same end of the middle shaft 1001 and the screw rod monomer 802. A multi-V belt 1003 is installed between the two synchronous wheels 1002 in the vertical direction. During the rotation of the screw rod monomer 802 in the screw rod expansion module 8, it will drive the middle shaft 1001 to rotate through the synchronous wheel 1002 and the multi-V belt 1003, and the middle shaft 1001 drives the double sprocket lifting structure 12 to move through the active bevel gear and the driven bevel gear in the bevel gear transmission structure 15. The bevel gear transmission structure 15 can effectively transmit rotational power and improve the efficiency of the compact shelving during operation. Its efficient power transmission ensures smooth operation under heavy load conditions. The double sprocket lifting structure 12 includes an upper longitudinal shaft 1201, a lower longitudinal shaft 1202, and a sprocket plate 1203 fixed at both ends of the upper longitudinal shaft 1201 and the lower longitudinal shaft 1202, a chain 1204 is installed between the two sprocket plates 1203 in the same vertical direction, and a U-shaped arm 13 extending upward and fixedly connected to the top of the first upper frame 3 is fixed at one end of the chain 1204. 01 are connected with each other by the bevel gear transmission structure 15, and the lower longitudinal shaft 1202 receives the rotational power from the bevel gear transmission structure 15, so that the sprockets 1203 at both ends of the lower longitudinal shaft 1202 and the upper longitudinal shaft 1201 can rotate under the connection of the chain 1204, so that the chain 1204 pulls the U-shaped arm 13 upward, that is, the U-shaped arm 13 forces the first upper frame 3 and the second upper frame 4 to move upward, and at this time, the height space of the compact rack can be expanded synchronously; Two curved portions are arranged on the outer wall of one side of the U-shaped arm 13, and the U-shaped arm 13 is slidably matched with the shaft frame 11 through the curved portions. The bevel gear transmission structure 15 includes an active bevel gear fixed at one end of the middle shaft 1001 and a driven bevel gear fixed at one end of the surface of the lower longitudinal shaft 1202, and the driven bevel gear and the active bevel gear are meshed with each other. For storing heavy objects or large quantities of items, the double sprocket lifting structure 12 can evenly distribute the load during the lifting process, reducing the reliance on single-point force, thereby improving the stability of the overall structure of the compact shelving, and because the screw expansion module 8 has a self-locking function, it allows each shaft to be locked in the front position, thereby providing better safety protection during the lifting process, avoiding accidents caused by failure of a single sprocket, and ensuring personal safety and property safety during use.

[0022] When the embodiment of the present application is in use, it is first necessary to start the rotary drive unit 7 in the compact rack through the motor controller 14. The motor controller is responsible for managing the operating status of the motor to ensure that the various components can cooperate according to the predetermined program. After starting, the motor controller 14 calculates the specific positions that each component needs to reach based on the height and length adjustment requirements input by the user. When the rotary drive unit 7 starts to rotate, it drives the screw expansion module 8 to work. During this process, the motor controller 14 can also adjust the rotation speed of the rotary drive unit 7, which will affect the subsequent lifting and expansion speed of the compact rack, and the screw expansion module 8 converts the rotary motion into linear motion, thereby driving the square-mouthed sub-compact rack 2 to move and expand outward, increasing the horizontal combined length of the square-mouthed main compact rack 1 and the square-mouthed sub-compact rack 2, that is, the distance between the square-mouthed main compact rack 1 and the square-mouthed sub-compact rack 2 is increased, thereby realizing the horizontal expansion of the space. While the compact rack is expanding horizontally, the pulley transmission structure 10 and the bevel gear transmission structure 15 play a dynamic role. The double sprocket lifting structure 12 can effectively transmit part of the rotational power of the screw expansion module 8 to the double sprocket lifting structure 12, which enables the first upper frame 3 and the second upper frame 4 to move in the vertical direction through the transmission of the chain, so as to realize the lifting and lowering of the first upper frame 3 and the second upper frame 4, and promote the vertical height of the square-mouthed main compact rack 1, the first upper frame 3 and the square-mouthed auxiliary compact rack 2, and the second upper rack 4 to be adjusted. During the whole process, the motor controller 14 will monitor the lifting and extension status in real time to ensure the synchronization of the two actions. The user can set the required height and width through the control panel of the motor controller 14, and the rotation drive unit 7 will adjust itself to ensure the accuracy of the operation. When the height and combined length of the compact rack structure reach the set value, the motor controller 14 will stop the operation of the rotation drive unit 7, and the entire compact rack is in a stable state. At this time, the user can safely store and retrieve items, and its multi-stage linkage structural design enables the compact rack to complete the height and width adjustment in a shorter time.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The space-adjustable compact shelving is characterized by: include: A square-mouthed main compact rack (1), a square-mouthed auxiliary compact rack (2) being installed on one side outer wall of the square-mouthed main compact rack (1) and being able to move away from or approach the square-mouthed main compact rack (1), a first upper frame (3) and a second upper frame (4) being respectively installed on the top of the square-mouthed main compact rack (1) and the square-mouthed auxiliary compact rack (2) in a lifting manner, one end of the second upper frame (4) extending into the interior of the first upper frame (3) and being slidably matched with the first upper frame (3); A screw extension module (8), the screw extension module (8) being arranged at the bottom end of the square-mouthed main compact rack (1) and being used to drive the square-mouthed auxiliary compact rack (2) to move away from or approach the square-mouthed main compact rack (1), a rotating drive unit (7) for driving the screw extension module (8) to work being installed on one side of the bottom end of the square-mouthed main compact rack (1), a T-shaped shaft plate (9) being fixed at an edge position on one side of the bottom of the square-mouthed main compact rack (1), and a pulley transmission structure (10) and a bevel gear transmission structure (15) being respectively arranged on the outer walls on both sides of the T-shaped shaft plate (9); Axle frames (11), wherein two of the axle frames (11) are mounted on the inner wall of the same side of the square-mouthed main compact rack (1), and a double-sprocket lifting structure (12) for driving the first upper frame (3) and the second upper frame (4) to lift and slide is arranged on the outer wall of one side of the two axle frames (11), and the double-sprocket lifting structure (12) is connected to the screw extension module (8) through a bevel gear transmission structure (15) and a pulley transmission structure (10), and a motor controller (14) is installed on one side of the surface of the square-mouthed main compact rack (1), and the output end of the motor controller (14) is electrically connected to the input end of the rotation drive unit (7).

2. The space-adjustable compact shelving according to claim 1 is characterized in that: A plurality of right-angled sheet metal parts (6) are installed at equal intervals in the vertical direction on the left and right inner walls of the square-mouthed main compact rack (1) and the square-mouthed auxiliary compact rack (2).

3. The space-adjustable compact shelving according to claim 1 is characterized in that: The square-mouthed secondary compact rack (2) is composed of a side frame (201) and four square-mouthed arms (202); the square-mouthed arms (202) are slidably mounted inside the square-mouthed main compact rack (1); one end of the square-mouthed arms (202) penetrates to the outside of the square-mouthed main compact rack (1); and the side frame (201) is fixed to the same end of the four square-mouthed arms (202).

4. The space-adjustable compact shelving according to claim 3 is characterized in that: The screw extension module (8) comprises a bottom plate (5) fixed at the bottom end of the square-mouthed main compact rack (1), a bearing seat (801) installed on the left and right sides of the bottom end of the bottom plate (5), a screw body (802) rotatably installed between the two bearing seats (801), and a nut pair (803) installed at a threaded portion of one end of the surface of the screw body (802), wherein the top end of the nut pair (803) is slidably matched with the bottom end of the bottom plate (5), and the screw extension module (8) also comprises a screw body (802) slidably installed on the bottom plate ( 5) slides (804) at the front and rear sides of the bottom and a connecting beam (805) fixed on the outer wall of one side of the slide (804), the end of the connecting beam (805) away from the slide (804) is fixedly connected to the bottom end of the side frame (201), a connecting plate is fixed between the nut pair (803) and the opposite outer wall of the slide (804), and the rotation drive unit (7) adopts a reduction motor, and the output end of the reduction motor is fixedly connected to one end of the screw rod monomer (802) through a coupling.

5. The space-adjustable compact shelving according to claim 4 is characterized in that: Dovetail guide rails are fixed on both sides of the bottom end of the base plate (5), a sliding sleeve is installed on the upper surface of the slide table (804), the sliding sleeve and the dovetail guide rail are fixedly connected, and a circular sleeve is installed on the end of the connecting beam (805) away from the slide table (804), and the circular sleeve is fixedly connected to the bottom end of the side frame (201).

6. The space-adjustable compact shelving according to claim 4, characterized in that: The pulley transmission structure (10) comprises a middle shaft (1001) rotatably mounted at one end inside a T-shaped shaft plate (9) and a synchronous wheel (1002) fixed at the same end of the middle shaft (1001) and the screw rod monomer (802), and a multi-V belt (1003) is installed between the two synchronous wheels (1002) in the vertical direction.

7. The space-adjustable compact shelving according to claim 6, characterized in that: The double sprocket lifting structure (12) comprises an upper longitudinal shaft (1201) rotatably mounted between the two shaft frames (11), a lower longitudinal shaft (1202), and a sprocket plate (1203) with fixed ends of the upper longitudinal shaft (1201) and the lower longitudinal shaft (1202); a chain (1204) is mounted between the two sprocket plates (1203) in the same vertical direction; a U-shaped arm (13) extending upward and fixedly connected to the top of the first upper frame (3) is fixed at one end of the chain (1204); and power connection is maintained between the lower longitudinal shaft (1202) and the middle shaft (1001) via a bevel gear transmission structure (15).

8. The space-adjustable compact shelving according to claim 7, characterized in that: The bevel gear transmission structure (15) comprises a driving bevel gear fixed to one end of the middle shaft (1001) and a driven bevel gear fixed to one end of the surface of the lower longitudinal shaft (1202), and the driven bevel gear and the driving bevel gear are meshed with each other.

9. The space-adjustable compact shelving according to claim 4, characterized in that: A foot support is installed at the corner position of the bottom end of the side frame (201).

10. The space-adjustable compact shelving according to claim 7, characterized in that: Two bent portions are provided on one side outer wall of the U-shaped arm (13), and the U-shaped arm (13) is slidably matched with the shaft frame (11) via the bent portions.

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