Frame structure convenient to expand

Abstract

A frame structure convenient to expand comprises at least two side frames, at least two transverse pipes, a plurality of in-pipe expansion connecting pieces and a plurality of double-end screws. The side frames are transversely arranged at intervals, and each side frame comprises two vertical pipes which are longitudinally arranged at intervals and a connecting rod which is connected between the two vertical pipes; at least one transverse through vertical pipe through hole is formed in the vertical pipe; the transverse pipes are respectively mounted between the vertical pipes which are transversely spaced on the adjacent side frames to form a frame structure; intra-pipe expansion connecting pieces are arranged in the two ends of the transverse pipe respectively and can be in interference fit with the inner wall of the transverse pipe. The double-end screws transversely penetrate through the vertical pipe through holes, and the two ends of each double-end screw extend out of the corresponding vertical pipe and are detachably connected and fixed with the in-pipe expansion connecting pieces of the transverse pipes on the inner side of the frame structure or limited to the outer side of the frame structure. Therefore, connection of the transverse pipe and the vertical pipe can be achieved through cooperation of the double-end screws, the in-pipe expansion connecting pieces arranged later and the connecting nuts, installation is convenient and fast, and the stability of the frame structure is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of frame structures, and in particular to a frame structure that is easy to expand. Background Technology

[0002] Frame structures are typically combined with partitions to form shelves, greenhouses, plant stands, storage cabinets, and more. Taking shelves as an example, shelves are a common type of storage unit widely used in supermarkets, warehouses, and express delivery points for storing goods. Common shelf types include wave shelves and angle steel frames. Shelves usually require a large number of screws and nuts to install, making assembly relatively laborious. Some shelves can extend vertically, mainly by stacking and connecting uprights. Some shelves also have internal threads welded inside the uprights, then double-ended screws are used for pipe-to-pipe connections to improve the stability of the connection between the upper and lower uprights. However, these vertically extending shelves cannot be extended horizontally, and the need for internal threads can lead to instability due to insufficient threads when the internal threads are made of sheet metal; while solid internal threads are expensive and have high welding production costs.

[0003] Furthermore, the inner threads inside each tube are welded and fixed. The coaxiality of the inner threads of different tubes will vary and cannot be adjusted. When the shelf needs to be expanded, the difference in coaxiality at the joint of the tubes will cause the more tubes connected, the more serious the skewing will be, ultimately making it impossible to assemble and expand the shelf smoothly.

[0004] Therefore, the existing framework structure has high manufacturing costs, and when expansion and extension are needed, it suffers from drawbacks such as difficulty in expansion and unstable connections. Utility Model Content

[0005] The purpose of this utility model is to provide a frame structure that is easy to expand, can improve production efficiency, reduce production costs, can be infinitely expanded horizontally, and has a stable structure.

[0006] To achieve the above objectives, the solution of this utility model is:

[0007] An easily expandable frame structure includes at least two side frames, at least two horizontal tubes, several internal expansion joints, and several double-ended screws;

[0008] Each side frame is arranged at horizontal intervals, and each side frame includes two vertically spaced vertical pipes and a connecting rod connecting the two vertical pipes; each vertical pipe is provided with at least one horizontally penetrating vertical pipe through hole;

[0009] Each horizontal tube is installed between the horizontally spaced vertical tubes on adjacent side frames to form a frame structure;

[0010] The inner expansion connectors are installed inside both ends of the horizontal tube, and the inner expansion connectors can be interference-fitted into the inner wall of the horizontal tube; the double-headed screws are horizontally inserted into the through holes of each vertical tube, and both ends extend out of the vertical tube and are respectively detachably connected and fixed to the inner expansion connectors of the horizontal tubes inside the frame structure or limited to the outer side of the frame structure.

[0011] Furthermore, the internal expansion connector is an expansion sunflower insert or an expansion nut insert.

[0012] Furthermore, the expanded sunflower insert includes a central post and guide flanges and two sunflower pieces distributed sequentially along the axial direction of the central post; the central post has a threaded connection hole for threaded engagement with a double-ended screw; the two ends of the central post are a guide flange and a sunflower piece, respectively, the outer periphery of the guide flange is raised in the same way as the outer periphery of the sunflower piece, and the outer diameter of the guide flange is larger than the inner diameter of the horizontal tube and forms a stop ring.

[0013] Furthermore, the expansion nut insert includes an inner expansion sleeve; the inner expansion sleeve has a conical cavity inside, and the end of the inner expansion sleeve near the outer side of the horizontal tube has an expansion sleeve hole communicating with the conical cavity, and the expansion sleeve hole is provided with internal threads; the end of the double-ended screw is used to screw into the expansion sleeve hole and can move laterally in the conical cavity to open the inner expansion sleeve, so that the inner expansion sleeve is interference-fitted with the inner wall of the horizontal tube.

[0014] Furthermore, the expansion nut insert includes an inner expansion sleeve and a movable cone; the inner expansion sleeve has a conical cavity inside, the movable cone is installed in the conical cavity, and the end of the inner expansion sleeve near the outer side of the horizontal tube has an expansion sleeve hole communicating with the conical cavity; the end of the double-ended screw is used to pass through the expansion sleeve hole and can drive the movable cone to move laterally in the conical cavity to open the inner expansion sleeve, so that the inner expansion sleeve is interference-fitted with the inner wall of the horizontal tube.

[0015] Furthermore, the conical cavity is wider inside and narrower outside; the movable cone is also wider inside and narrower outside, and the movable cone has a conical screw hole that extends laterally through both ends in the middle; the end of the double-ended screw passes through the expansion sleeve hole and is screwed into the conical screw hole, and the rotation of the double-ended screw can drive the movable cone to move laterally outward in the conical cavity by opening the expansion sleeve inside the tube.

[0016] Furthermore, the conical cavity is narrow inside and wide outside; the movable cone is also narrow inside and wide outside; the expansion sleeve hole is provided with internal threads, the double-ended screw is screwed into the expansion sleeve hole and its end abuts against the movable cone, and the rotation of the double-ended screw can drive the movable cone to move laterally inward in the conical cavity to open the tube expansion sleeve.

[0017] Furthermore, the outer diameter of the inner expansion sleeve before it opens is not greater than the inner diameter of the horizontal tube; the inner expansion sleeve is also provided with an abutting flange that overlaps with the end face of the horizontal tube at its end edge near the outer side of the horizontal tube; the inner expansion sleeve is provided with an abutting wing on the outer wall inside the horizontal tube, and the outer end of the abutting wing is raised and can be tightly fitted against the inner wall of the horizontal tube.

[0018] Furthermore, the horizontal tube is a hollow circular or rectangular tube; the vertical tube is a hollow circular or rectangular tube; the connecting rod is a hollow circular or rectangular tube; and the shape of the internal expansion connector is circular or rectangular to fit the inner cavity of the horizontal tube.

[0019] Furthermore, support partitions are provided between the longitudinally adjacent horizontal tubes to form a shelf structure.

[0020] Furthermore, the four corners of the supporting partition are mounted on the shelf supports installed between the connecting rods of the side frame and the adjacent horizontal tubes; a middle support plate is also installed in the middle of the longitudinally adjacent horizontal tubes, and the middle support plate is supported below the supporting partition; a groove is also recessed on the horizontal tube and the connecting rod respectively corresponding to the shelf support and the middle support plate, and the two ends of the shelf support and the middle support plate are fitted and fastened in the groove.

[0021] Furthermore, the riser is a hollow tube with a butt joint at the bottom, which can be inserted and fixed to the top opening of another riser; a supporting partition is provided between the longitudinally adjacent horizontal tubes in the frame structure; multiple outer baffles and at least one door panel are provided on the outer periphery of the frame structure to form a storage cabinet structure.

[0022] Furthermore, a fixing sleeve is provided between the horizontal tube and the vertical tube; the fixing sleeve has a horizontally penetrating fixing sleeve through hole in the middle, through hole for double-ended screws to pass through, and a positioning block protrudes from the side of the fixing sleeve near the vertical tube; screw holes or protruding screws can be provided in the upper, lower, front and back directions of the outer periphery of the fixing sleeve; the vertical tube is provided with corresponding positioning holes for the positioning blocks to be inserted, and it is ensured that each screw hole or screw is located in the upper, lower, front and back directions of the fixing sleeve.

[0023] When the support partition is placed above the longitudinally adjacent horizontal tubes, it is locked to the top of each fixing sleeve.

[0024] The left and right baffles of the outer baffle are respectively locked to the side of the riser, and the rear baffles are respectively locked to the rear side of each fixing sleeve; a fixing plate is locked to the front side of each fixing sleeve on the left or right side of the frame structure, and the door panel is hinged to the fixing plate.

[0025] Furthermore, the end of the double-headed screw that extends out of the riser and is located on the outside of the frame structure is limited by a locking nut.

[0026] By adopting the above technical solution, the connection between horizontal and vertical pipes can be achieved through the cooperation of double-ended screws, post-installed internal expansion connectors, and connecting nuts. Installation is convenient and quick, eliminating the need for excessive screws and nuts. Furthermore, the double-ended screws firmly lock the horizontal pipes at both ends, ensuring that all horizontal pipes are connected as a whole, significantly improving the overall stability of the assembled frame structure. Simultaneously, since the internal expansion connectors are post-installed, the interference fit between the internal expansion connectors and the inner wall of the horizontal pipes eliminates the need for welding, reducing welding costs and improving production efficiency. Moreover, this invention can achieve unlimited horizontal expansion by setting multiple side frames and using double-ended screws in conjunction with multiple horizontal pipes. The post-installed internal expansion connectors also ensure good coaxiality between the connected horizontal pipes. Attached Figure Description

[0027] Figure 1 This is a perspective view of Embodiment 1 of the present utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the local structural decomposition at point A;

[0029] Figure 3 This is a schematic diagram of the storage rack in Embodiment 1 of this utility model;

[0030] Figure 4 This is an extended schematic diagram of Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the storage cabinet according to Embodiment 1 of this utility model;

[0032] Figure 6 This is a partial structural exploded view of Embodiment 2 of the present invention;

[0033] Figure 7 This is another partial exploded view of the structure of Embodiment 2 of this utility model;

[0034] Figure 8 This is a partial structural cross-sectional view of Embodiment 2 of the present invention;

[0035] Figure 9 This is a partial exploded view of Embodiment 3 of the present invention;

[0036] Figure 10 This is a partial structural cross-sectional view of Embodiment 3 of the present invention;

[0037] Figure 11 This is a schematic diagram of the expansion nut insert of Embodiment 3 of this utility model;

[0038] Figure 12 This is a partial structural exploded view of Embodiment 4 of the present invention;

[0039] Figure 13 This is a partial structural cross-sectional view of Embodiment 4 of the present invention;

[0040] Figure 14 This is a partial exploded view of Embodiment 5 of the present invention;

[0041] Figure 15 This is a schematic diagram of the storage rack in Embodiment 6 of this utility model;

[0042] Figure 16 This is a schematic diagram of the storage rack in Embodiment 7 of this utility model;

[0043] Figure 17 This is a schematic diagram of the storage rack in Embodiment 8 of this utility model;

[0044] Figure 18 This is a partial exploded view of Embodiment 8 of the present invention;

[0045] Figure 19 This is a schematic diagram of the storage cabinet according to Embodiment 9 of this utility model;

[0046] Figure 20 This is a partial structural exploded view of Embodiment 9 of the present invention;

[0047] Figure 21 This is a schematic diagram of another structure of the fixing sleeve in Embodiment 9 of this utility model.

[0048] Labeling explanation: Frame structure 10, Shelf structure 20, Locker structure 30;

[0049] Side frame 1, riser 11, riser through hole 111, butt joint constriction 112, protrusion 113, positioning hole 114, connecting rod 12, fixing sleeve 13, fixing sleeve through hole 131, positioning block 132, screw 133, nut 134, screw hole 135, screw 136, horizontal tube 2, duckbill washer 21, internal expansion connector 3, expansion sunflower insert 31, center post 311, sunflower piece 312, threaded connection hole 313, guide flange 314, expansion nut insert 32, internal expansion sleeve 321. 322 movable cone, 323 conical cavity, 324 expansion sleeve hole, 325 expansion body, 326 partition gap, 327 cone screw hole, 328 limiting rib, 329 abutting flange, 330 abutting wing, 4 double-ended screw, 41 hex bolt, 5 connecting nut, 6 supporting partition, 61 arc-shaped clamping part, 62 arc-shaped hook, 63 clamping notch, 64 partition through hole, 7 outer baffle, 71 left baffle, 72 right baffle, 73 rear baffle, 8 door panel, 81 fixing plate, 91 shelf support, 92 middle support plate. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Example 1

[0052] like Figures 1 to 5 As shown, this embodiment provides a frame structure that is easy to expand, including at least two side frames 1, at least two horizontal tubes 2, several internal expansion connectors 3, and several double-ended screws 4.

[0053] Each side frame 1 is arranged horizontally at intervals. Each side frame 1 includes two vertically spaced risers 11 and a connecting rod 12 connecting the two risers 11. Each riser 11 is provided with at least one horizontally through riser hole 111. Each horizontal pipe 2 is installed between the horizontally spaced risers 11 on adjacent side frames 1 to form a frame structure 10.

[0054] The inner expansion connectors 3 are respectively installed inside both ends of the horizontal tube 2. The inner expansion connectors 3 can be interference-fitted into the inner wall of the horizontal tube 2. The double-headed screws 4 are horizontally inserted into the through holes 111 of each vertical tube, and both ends extend out of the vertical tube 11 and are respectively detachably connected and fixed to the inner expansion connectors 3 of the horizontal tube 2 inside the frame structure 10 or limited to the outside of the frame structure 10.

[0055] This allows for the connection between the horizontal pipe 2 and the vertical pipe 11 through the cooperation of the double-ended screw 4, the post-installed internal expansion connector 3, and the connecting nut 5, making installation convenient and quick.

[0056] Two side frames 1 and two horizontal tubes 2 can form a basic frame structure 10. In this embodiment, as shown... Figure 1 The following explanation uses three side frames 1 as an example to illustrate how to expand the frame structure 10. Of course, in practice, the frame structure 10 can be expanded and extended horizontally, infinitely, and modularly as needed.

[0057] In this embodiment, the double-ended screw 4 can be easily extended laterally to the left and right, and the end of the double-ended screw 4 that extends out of the riser 11 and is located outside the frame structure 10 can be limited by locking a hexagonal nut or other connecting nut 5.

[0058] Specifically, three side frames 1 are erected sequentially at intervals, and double-ended screws 4 are inserted into the through holes 111 of the risers 11 of each side frame 1. Then, expansion connectors 3 are installed inside both ends of each horizontal pipe 2. By controlling the rotation of the horizontal pipe 2, the expansion connectors 3 are locked to the double-ended screws 4 on the risers 11, thus achieving the connection and cooperation between each horizontal pipe 2 and each riser 11. The operation is simple and convenient, requiring no additional tools. Thus, the two ends of the double-ended screws 4 of the risers 11 of the middle side frame 1 are connected to the horizontal pipes 2, while the inner ends of the double-ended screws 4 of the risers 11 of the two edge side frames 1 are connected to the horizontal pipes 2, and the outer ends can be locked and fixed by connecting nuts 5. There is no need to use too many screws and nuts, which makes it convenient and quick to assemble the frame structure 10 of the three side frames 1.

[0059] Furthermore, the double-ended screws 4 can firmly lock the horizontal tubes 2 at both ends, ensuring that each horizontal tube 2 is connected as a whole, which can greatly improve the overall stability of the frame structure 10 after assembly.

[0060] Since the internal expansion connector 3 is a post-installed structure, the interference fit between the internal expansion connector 3 and the inner wall of the horizontal tube 2 eliminates the need for welding, thereby reducing welding costs and improving production efficiency. Furthermore, by setting multiple side frames and using double-ended screws 4 in conjunction with multiple horizontal tubes 2, unlimited horizontal expansion can be achieved while ensuring good coaxiality.

[0061] The internal expansion connector 3 includes, but is not limited to, the expansion sunflower insert 31 and the expansion nut insert 32.

[0062] like Figure 2 As shown, in this embodiment, the expansion connector 3 inside the pipe is described using the expansion sunflower insert 31 as an example, the horizontal pipe 2 is a hollow round pipe as an example, and the vertical pipe 11 is a hollow rectangular pipe as an example.

[0063] The expanded sunflower insert 31 includes a central post 311 and sunflower pieces 312 fixed at both ends of the central post 311; the central post 311 has a threaded connection hole 313 for threaded engagement with the double-ended screw 4; the outer periphery of the sunflower piece 312 is raised and used for interference fit with the inner wall of the horizontal tube 2.

[0064] During assembly, the expanding sunflower insert 31 can be hammered into the openings at both ends of the horizontal tube 2 using tools such as a hammer. This causes the periphery of the sunflower petals 312 to be compressed and expand outwards, thus securing them to the inner wall of the horizontal tube 2 for a tight fit. The threaded connection hole 313 in the central column 311 can be screwed into the double-ended screw 4 for fixation, thus securing the horizontal tube 2 to the vertical tube 11. The installation is convenient and quick. The expanding sunflower insert 31 has low cost, low production cost, and good fixing effect.

[0065] The connecting rod 12 can be one or more. In this embodiment, two connecting rods 12 are used as an example for illustration. They can be distributed vertically at intervals. The two ends of the connecting rod 12 can be welded and fixed between two risers 11 respectively, or they can be detachably connected between adjacent risers 11.

[0066] For example Figure 3 In this embodiment, a support partition 6 can be provided between longitudinally adjacent horizontal tubes 2. The front and rear ends of the support partition 6 can be provided with arc-shaped clamping parts 61 to fasten and fix it to the front and rear horizontal tubes 2. Thus, when consumers install it themselves, they only need to fasten the support partition 6 from top to bottom to complete the assembly operation. The support partition 6, together with the frame structure 10, can form a shelf structure 20, which is convenient for users to place items.

[0067] See Figure 4 In this embodiment, the riser 11 is provided with at least two vertically spaced through holes 111, and each through hole 111 is fitted with a double-ended screw 4 and connected to a horizontal pipe 2. The riser 11 is a hollow pipe, and the bottom of the riser 11 has a butt joint 112, which can be inserted and fixed to the top opening of another riser 11. Thus, the above-mentioned basic frame structure 10 can be modularly configured by horizontal expansion and vertical stacking to form a large frame structure, which is suitable for the storage needs of warehouses for large-capacity items.

[0068] Of course, only one riser through hole 111 can be provided on the riser 11.

[0069] For example Figure 5 As shown, a supporting partition 6 can be provided between the longitudinally adjacent horizontal tubes 2 of the frame structure 10, and multiple outer baffles 7 and at least one door panel 8 can be provided on the outer periphery of the frame structure 10, thereby forming a storage cabinet structure 30. In this embodiment, a four-door storage cabinet is illustrated, wherein the outer baffles 7 may include a left baffle 71, a right baffle 72, and a rear baffle 73, and can be detachably connected to the vertical tubes 11 of the frame structure 10, and there may be four door panels 8, which are respectively hinged to the corresponding vertical tubes 11. Of course, the specific number and installation method of the outer baffles 7 are not limited to this embodiment, and those skilled in the art can adjust and set them as needed.

[0070] Of course, the frame structure 10 can also be combined with several partitions to form wardrobes, greenhouses, flower racks, etc.

[0071] Example 2

[0072] like Figures 6 to 8 As shown in the figure, in this embodiment, the expansion connector 3 inside the pipe is described using the expansion nut insert 32 as an example.

[0073] The expansion nut insert 32 includes an inner expansion sleeve 321 and a movable cone 322; the inner expansion sleeve 321 has a conical cavity 323 inside, the movable cone 322 is installed in the conical cavity 323, and the end of the inner expansion sleeve 321 near the outside of the horizontal tube 2 has an expansion sleeve hole 324 communicating with the conical cavity 323; the end of the double-ended screw 4 is used to pass through the expansion sleeve hole 324 and can drive the movable cone 322 to move laterally in the conical cavity 323 to open the inner expansion sleeve 321, so that the inner expansion sleeve 321 is interference-fitted with the inner wall of the horizontal tube 2.

[0074] Therefore, during assembly, the expansion nut insert 32 can be inserted into the end of the horizontal tube 2 and then engaged with the double-ended screw 4 to allow the expansion nut insert 32 to expand and open to press against the inner wall of the horizontal tube 2, achieving an interference fit fixation. This facilitates the fixation of the horizontal tube 2 and the vertical tube 11 and ensures the coaxiality of each horizontal tube 2.

[0075] By using the expansion nut insert 32, the position of the center hole of the expansion connector 3 inside the tube and the double-ended screw 4 can be finely adjusted. Thus, when the horizontal tubes 2 on both sides of the middle side frame 1 are connected to the same double-ended screw 4, the coaxiality can be maintained by the expansion connector 3 inside the tube. This ensures that when the frame structure 10 extends laterally, the horizontal tubes 2 connected by the same line in the lateral direction do not become skewed, thus meeting the infinite expansion requirements of the frame structure 10.

[0076] Specifically, in this embodiment, the inner expansion sleeve 321 is provided with at least two circumferentially spaced expansion bodies 325 near the inner side of the horizontal tube 2, and there is a separation gap 326 between adjacent expansion bodies 325. In this embodiment, there are four expansion bodies 325 and four separation gaps 326; the conical cavity 323 is formed between each expansion body 325; the conical cavity 323 is wider inside and narrower outside.

[0077] The movable cone 322 is also wider inside and narrower outside, and has a conical screw hole 327 that extends laterally through both ends in the middle; the movable cone 322 is movably placed in the conical cavity 323 and the outer wall of the movable cone 322 is provided with at least one limiting rib 328. In this embodiment, two symmetrical limiting ribs 328 are set as an example. The limiting ribs 328 slide in the partition gap 326.

[0078] In this way, such as Figure 8When the end of the double-ended screw 4 passes through the expansion sleeve hole 324 and is screwed into the conical screw hole 327, the rotation of the double-ended screw 4 can drive the movable cone 322 to move laterally outward within the conical cavity 323, opening the inner expansion sleeve 321. In actual installation, the relative rotation of the double-ended screw 4 can be achieved by rotating the horizontal tube 2 and the inner expansion sleeve 321. The rotation of the double-ended screw 4 will have a tendency to drive the movable cone 322 to rotate. However, since the limiting rib 328 of the movable cone 322 is limited in the partition gap 326, the rotation tendency will be changed into a lateral outward movement. This achieves the compression and expansion of the narrow end of the conical cavity 323, which can also cause the inner ends of each expansion body 325 to separate and open, and press against the inner wall of the horizontal tube 2 to achieve an interference fit.

[0079] See Figure 7 In this embodiment, the outer diameter of the inner expansion sleeve 321 before it opens is not greater than the inner diameter of the horizontal tube 2, so as to facilitate insertion into the horizontal tube 2.

[0080] The inner expansion sleeve 321 is also provided with an abutment flange 329 that overlaps the end face of the horizontal tube 2 at the end edge near the outside of the horizontal tube 2; it can be used to limit the movement and prevent the inner expansion sleeve 321 from falling directly into the tube.

[0081] Meanwhile, the inner expansion sleeve 321, located on the outer wall inside the horizontal tube 2, may be provided with an abutment wing 330. The outer end of the abutment wing 330 is raised and can be tightly fitted against the inner wall of the horizontal tube 2. This achieves the pre-positioning of the inner expansion sleeve 321, allowing it to be initially engaged with the inner wall of the horizontal tube 2, preventing it from falling out of the horizontal tube 2, and facilitating subsequent installation and locking.

[0082] In this embodiment, the horizontal tube 2 is a hollow circular tube, but it can also be a rectangular tube, etc.; the shape of the inner expansion sleeve 321 can be circular or rectangular, etc., to fit the inner cavity of the horizontal tube 2.

[0083] Example 3

[0084] like Figures 9 to 11 As shown, the expansion connector 3 inside the pipe is illustrated using the expansion nut insert 32 as an example.

[0085] In this embodiment, the expansion nut insert 32 includes an inner expansion sleeve 321 and a movable cone 322. The inner expansion sleeve 321 also has a conical cavity 323 inside, and the movable cone 322 is installed in the conical cavity 323. The end of the inner expansion sleeve 321 near the outside of the horizontal tube 2 also has an expansion sleeve hole 324 that communicates with the conical cavity 323. The end of the double-ended screw 4 is used to pass through the expansion sleeve hole 324 and can drive the movable cone 322 to move laterally in the conical cavity 323 to open the inner expansion sleeve 321, so that the inner expansion sleeve 321 is interference-fitted with the inner wall of the horizontal tube 2.

[0086] Specifically, in this embodiment, the inner expansion sleeve 321 is provided with at least two circumferentially spaced expansion bodies 325 near the inner side of the horizontal tube 2, and there is a separation gap 326 between adjacent expansion bodies 325. In this embodiment, there are four expansion bodies 325 and four separation gaps 326; the conical cavity 323 is formed between each expansion body 325; the conical cavity 323 is narrow inside and wide outside.

[0087] The movable cone 322 is also narrow inside and wide outside; and the expansion sleeve hole 324 is provided with an internal thread. The double-ended screw 4 is screwed into the expansion sleeve hole 324 and its end abuts against the movable cone 322. The rotation of the double-ended screw 4 can drive the movable cone 322 to move laterally inward in the conical cavity 323 to open the expansion sleeve 321.

[0088] In this embodiment, the double-ended screws 4 on the risers 11 on both sides of the horizontal side of the frame structure 10 can be replaced with hex bolts 41. The double-ended screws 4 are still used on the inside of the frame structure 10. That is, the double-ended screws 4 are set on the risers 11 on the inside of the frame structure 10, and the hex bolts 41 are set on the risers 11 on both sides of the horizontal side of the frame structure 10.

[0089] In this way, such as Figure 10 As shown, taking the connection of the riser 11 at the horizontal edges of the frame structure 10 as an example, the hexagonal bolt 41 can be passed through the riser through hole 111 of the riser 11, and its end can be screwed into the expansion sleeve hole 324 and abut against the movable cone 322. The hexagonal bolt 41 can push against the movable cone 322 as it moves laterally inward in the conical cavity 323, opening the inner expansion sleeve 321. In actual installation, the relative rotation of the hexagonal bolt 41 can be achieved by rotating the horizontal pipe 2 and the inner expansion sleeve 321. The lateral inward movement of the movable cone 322 in the conical cavity 323 can achieve the squeezing and expansion of the narrow end of the conical cavity 323, which can also cause the expansion bodies 325 to separate and open, and press against the inner wall of the horizontal pipe 2 to achieve an interference fit.

[0090] Example 4

[0091] like Figure 12 and Figure 13 As shown, the structure of this embodiment is basically the same as that of embodiment 3 above. The main difference is that the expansion nut insert 32 in this embodiment does not include the movable cone 322.

[0092] The inner expansion sleeve 321 has a conical cavity 323 inside. The end of the inner expansion sleeve 321 near the outer side of the horizontal tube 2 has an expansion sleeve hole 324 communicating with the conical cavity 323. The expansion sleeve hole 324 has an internal thread. The end of the double-ended screw 4 is screwed into the expansion sleeve hole 324 and can rotate within the expansion sleeve hole 324 to move laterally within the conical cavity 323, thereby directly opening the inner expansion sleeve 321 and allowing it to press against the inner wall of the horizontal tube 2. This makes assembly more convenient and faster.

[0093] Example 5

[0094] like Figure 14 As shown, the structure of this embodiment is basically the same as that of the above embodiment 1. The main difference is that the tube expansion connector 3 in this embodiment takes the expansion sunflower insert 31 as an example, and the expansion sunflower insert 31 is also provided with a guide flange 314.

[0095] The expanded sunflower insert 31 includes a central post 311 and guide flanges 314 and two sunflower pieces 312 arranged sequentially along the axial direction of the central post 311. The central post 311 has a threaded connection hole 313 for threaded engagement with the double-ended screw 4. The two ends of the central post 311 are a guide flange 314 and a sunflower piece 312, respectively. The outer periphery of the guide flange 314 is raised in the same way as the outer periphery of the sunflower piece 312, that is, the guide flange 314 can be inverted conical. The outer diameter of the guide flange 314 is slightly larger than the inner diameter of the horizontal tube 2 and forms a stop ring 315.

[0096] Therefore, when the expanding sunflower insert 31 of this embodiment is installed into the horizontal tube 2, the inverted conical guide flange 314 can be used for guidance, ensuring good coaxiality between the expanding sunflower insert 31 and the horizontal tube 2, and preventing the expanding sunflower insert 31 from shifting during installation. This ensures that the horizontal tubes do not tilt when the frame structure expands in the horizontal direction, achieving the purpose of wireless expansion.

[0097] Furthermore, the stop ring 315 of the guide flange 314 can be limited to the open end face of the horizontal tube 2 to prevent the expansion sunflower insert 31 from moving inward and to ensure the connection effect with the double-ended screw 4.

[0098] Example 6

[0099] like Figure 15 As shown, the structure of this embodiment is basically the same as that of the above embodiment. The main difference is that the support partition 6 of the longitudinally adjacent horizontal pipe 2 in this embodiment does not have an arc-shaped clamping part 61. The vertical pipe 11, connecting rod 12 and horizontal pipe 2 in this embodiment are all circular pipes. Only one vertical pipe through hole 111 is provided on the vertical pipe 11 in this embodiment.

[0100] Specifically, in this embodiment, the four corners of the supporting partition 6 can be placed on the shelf support 91 installed between the connecting rod 12 of the side frame 1 and the adjacent horizontal tube 2. Thus, when consumers install it themselves, they only need to place the supporting partition 6 from top to bottom to complete the assembly operation. The supporting partition 6, together with the frame structure 10, can form a shelf structure 20, which is convenient for users to place items. The four corners of the supporting partition 6 are supported by the shelf support 91, ensuring the support performance.

[0101] Furthermore, in this embodiment, intermediate support plates 92 can be installed in the middle of the longitudinally adjacent horizontal tubes 2. One or more can be set. In this embodiment, two intermediate support plates 92 are used as an example to improve the manufacturing effect of the support partition 6 and improve the support performance of the shelf structure 20.

[0102] In this embodiment, the horizontal tube 2 and the connecting rod 12 may also be provided with a recessed groove 93 corresponding to the shelf support 91 and the intermediate support plate 92, so that the two end fasteners 94 of the shelf support 91 and the intermediate support plate 92 can be fitted and fastened in the groove 93, which can position the shelf support 91 and the intermediate support plate 92, and also make the surface of the horizontal tube 2 and the connecting rod 12 flat, making the appearance cleaner and more beautiful.

[0103] In this embodiment, the riser 11, the connecting rod 12 and the horizontal pipe 2 are all circular pipes. The connecting rod 12 can be welded to the riser 11, and a duckbill gasket 21 can be provided between the end of the horizontal pipe 2 and the riser 11 to increase the contact area and improve the locking and fixing effect.

[0104] Furthermore, the bottom of the riser 11 in this embodiment may have a protruding dot 113 on the docking constriction 112. When the docking constriction 112 can be inserted and fixed into the top opening of another riser 11, the protruding dot 113 can be used to increase the friction and improve the stability of the docking, thereby improving the overall stability of the shelf structure 20.

[0105] Example 7

[0106] like Figure 16 As shown, the structure of this embodiment is basically the same as that of the above embodiments. The main difference is that the supporting partition 6 of the longitudinally adjacent horizontal tubes 2 in this embodiment is a mesh plate.

[0107] The mesh-like support partition 6 can be provided with several arc-shaped hooks 62 around its perimeter. Each arc-shaped hook 62 can be placed on the connecting rod 12 and the horizontal pipe 2 to achieve convenient and quick installation and fixing.

[0108] Example 8

[0109] like Figure 17 and Figure 18As shown, the structure of this embodiment is basically the same as that of the above embodiment. The main difference is that the support partition 6 in this embodiment has snap-fit ​​notches 63 at the four corners. Also, the vertical tube 11, connecting rod 12 and horizontal tube 2 in this embodiment are all rectangular tubes.

[0110] Specifically, the supporting partition 6 can be a rectangular wooden board, and each of the four corners has a snap-fit ​​notch 63. The snap-fit ​​notch 63 makes way for the four vertical pipes 11 so that the supporting partition 6 can be placed on top of the connecting rod 12 and the horizontal pipe 2.

[0111] In this embodiment, the horizontal tube 2 is a rectangular tube, and therefore has a rectangular inner cavity. The corresponding shape of the inner tube expansion connector 3 is rectangular. In this embodiment, the inner tube expansion connector 3 is exemplified by a rectangular expansion sunflower insert 31.

[0112] Example 9

[0113] like Figures 19 to 20 As shown, the structure of this embodiment is basically the same as that of the above embodiment 1. The main difference is that the frame structure 10 of this embodiment is described as forming a single-door storage cabinet structure 30 in conjunction with the outer baffle 7 and the door panel 8, and the arrangement of the supporting partition 6, the outer baffle 7 and the door panel 8 is different.

[0114] Specifically, in this embodiment, a fixing sleeve 13 may be provided between the horizontal pipe 2 and the vertical pipe 11.

[0115] The outer diameter of the fixing sleeve 13 can be the same as the outer diameter of the horizontal tube 2. The fixing sleeve 13 has a transverse through hole 131 in the middle, through which the double-ended screw 4 passes. At least one positioning block 132 protrudes from the side of the fixing sleeve 13 near the vertical tube 11. Protruding screws 133 can be pre-embedded in the upper, lower, front and back directions of the outer periphery of the fixing sleeve 13 (see reference). Figure 20 ), or it is equipped with screw hole 134 (see Figure 21 ).

[0116] The riser 11 is provided with a positioning hole 114 for the positioning block 132 to be inserted. In this embodiment, the positioning hole 114 extends horizontally through both sides of the riser 11. The positioning block 132 in this embodiment is a non-circular rectangle, but it is not limited to this. When the fixing sleeve 13 is installed, the positioning block 132 can be inserted into the positioning hole 114 of the riser 11 to achieve the positioning of the fixing sleeve 13, ensuring that each screw hole 134 or screw 133 can be located in the up, down, front, and back directions of the fixing sleeve 13. Then, the double-ended screw 4 passing through the fixing sleeve through hole 131 can be locked with the horizontal pipe 2 by relative rotation, and the fixing sleeve 13 is locked between the riser 11 and the horizontal pipe 2.

[0117] The four corners of the supporting partition 6 may be provided with partition through holes 64, so that when the supporting partition 6 is placed above the longitudinally adjacent horizontal tube 2, each partition through hole 64 can be used for screws 133 to pass through and be fastened with nuts 134, so as to achieve connection and fixation of the supporting partition 6. Alternatively, each partition through hole 64 can also be used for screws 136 to pass through and be fastened with screw holes 135 to achieve corresponding connection and fixation.

[0118] The left baffle 71 and right baffle 72 of each outer baffle 7 can be locked to the side of the riser 11, while the rear baffle 73 can be locked to the rear of each fixing sleeve 13. The front door panel 8 can be hinged to the fixing plate 81 locked to the front of each right fixing sleeve 13. Of course, the fixing plate 81 can also be locked to the front of each fixing sleeve 13 on the left front of the frame structure 10.

[0119] Therefore, by setting the fixing sleeve 13, the support partition 6, the outer baffle 7 and the door panel 8 can be easily locked and attached, and modular expansion can be realized. When the outer baffle 7 needs to be installed, the fixing sleeve 13 is installed. When the outer baffle 7 is not needed, the horizontal pipe 2 can be directly connected to the vertical pipe 11.

[0120] In this embodiment, the fixing sleeve 13 is set to be circular following the shape of the horizontal tube 2. Of course, if the horizontal tube 2 is rectangular, the corresponding fixing sleeve 13 can also be rectangular.

[0121] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0122] In the description of the embodiments of this application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use, or the orientations or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

Claims

1. A frame structure that is easy to expand, characterized in that: It includes at least two side frames, at least two horizontal tubes, several internal expansion joints, and several double-ended screws; Each side frame is arranged at horizontal intervals, and each side frame includes two vertically spaced risers and a connecting rod connecting the two risers; each riser is provided with at least one horizontally penetrating riser through hole; Each horizontal tube is installed between the horizontally spaced vertical tubes on adjacent side frames to form a frame structure; The inner expansion connectors are installed inside both ends of the horizontal tube, and the inner expansion connectors can be interference-fitted into the inner wall of the horizontal tube; the double-headed screws are horizontally inserted into the through holes of each vertical tube, and both ends extend out of the vertical tube and are respectively detachably connected and fixed to the inner expansion connectors of the horizontal tubes inside the frame structure or limited to the outer side of the frame structure.

2. The easily expandable frame structure according to claim 1, characterized in that: The internal expansion connector is either an expansion sunflower insert or an expansion nut insert.

3. The easily expandable frame structure according to claim 2, characterized in that: The expanded sunflower insert includes a central post and guide flanges and two sunflower pieces distributed sequentially along the axial direction of the central post; the central post has a threaded connection hole for threaded engagement with a double-ended screw; the two ends of the central post are a guide flange and a sunflower piece, respectively, the outer periphery of the guide flange is raised like the outer periphery of the sunflower piece, and the outer diameter of the guide flange is larger than the inner diameter of the horizontal tube and forms a stop ring.

4. The easily expandable frame structure according to claim 2, characterized in that: The expansion nut insert includes an inner expansion sleeve; the inner expansion sleeve has a conical cavity inside, and the end of the inner expansion sleeve near the outer side of the horizontal tube has an expansion sleeve hole that communicates with the conical cavity, and the expansion sleeve hole is provided with internal threads; the end of the double-ended screw is used to screw into the expansion sleeve hole and can move laterally in the conical cavity to open the inner expansion sleeve, so that the inner expansion sleeve is interference-fitted with the inner wall of the horizontal tube.

5. The easily expandable frame structure according to claim 2, characterized in that: The expansion nut insert includes an inner expansion sleeve and a movable cone; the inner expansion sleeve has a conical cavity inside, the movable cone is installed in the conical cavity, and the end of the inner expansion sleeve near the outer side of the horizontal tube has an expansion sleeve hole that communicates with the conical cavity; the end of the double-ended screw is used to pass through the expansion sleeve hole and can drive the movable cone to move laterally in the conical cavity to open the inner expansion sleeve, so that the inner expansion sleeve is interference-fitted with the inner wall of the horizontal tube.

6. The easily expandable frame structure according to claim 5, characterized in that: The conical cavity is wider inside and narrower outside; the movable cone is also wider inside and narrower outside, and the movable cone has a conical screw hole that extends laterally through both ends in the middle; the end of the double-headed screw passes through the expansion sleeve hole and is screwed into the conical screw hole, and the rotation of the double-headed screw can drive the movable cone to move laterally outward in the conical cavity through the expansion sleeve inside the tube.

7. The easily expandable frame structure according to claim 5, characterized in that: The conical cavity is narrow inside and wide outside; the movable cone is also narrow inside and wide outside; the expansion sleeve hole is provided with internal thread, the double-ended screw is screwed into the expansion sleeve hole and its end abuts against the movable cone, and the rotation of the double-ended screw can drive the movable cone to move laterally inward in the conical cavity to open the tube expansion sleeve.

8. The easily expandable frame structure according to claim 5, characterized in that: The outer diameter of the inner expansion sleeve before it opens is not greater than the inner diameter of the horizontal tube; the inner expansion sleeve is also provided with an abutting flange that overlaps with the end face of the horizontal tube at its end edge near the outer side of the horizontal tube; the inner expansion sleeve is provided with an abutting wing on the outer wall inside the horizontal tube, and the outer end of the abutting wing is raised and can fit tightly against the inner wall of the horizontal tube.

9. A frame structure that is easy to expand according to claim 2, characterized in that: The horizontal tube is a hollow circular or rectangular tube; the vertical tube is a hollow circular or rectangular tube; the connecting rod is a hollow circular or rectangular tube; and the shape of the internal expansion connector is circular or rectangular to fit the inner cavity of the horizontal tube.

10. The easily expandable frame structure according to claim 1, characterized in that: Supporting partitions are provided between longitudinally adjacent horizontal tubes to form a shelving structure.

11. The easily expandable frame structure according to claim 10, characterized in that: The four corners of the supporting partition are mounted on the shelf supports installed between the connecting rods of the side frame and the adjacent horizontal tubes; a middle support plate is also installed in the middle of the longitudinally adjacent horizontal tubes, and the middle support plate is located below the supporting partition; a groove is also recessed on the horizontal tubes and connecting rods respectively corresponding to the shelf supports and the middle support plate, and the two ends of the shelf supports and the middle support plate are fitted and fastened in the groove.

12. The easily expandable frame structure according to claim 1, characterized in that: The riser is a hollow tube with a butt joint at the bottom, which can be inserted and fixed to the top opening of another riser; a supporting partition is provided between the longitudinally adjacent horizontal tubes in the frame structure; multiple outer baffles and at least one door panel are provided on the outer periphery of the frame structure to form a storage cabinet structure.

13. The easily expandable frame structure according to claim 12, characterized in that: A fixing sleeve is provided between the horizontal tube and the vertical tube; the fixing sleeve has a horizontal through hole in the middle for a double-ended screw to pass through, and a positioning block protrudes from the side of the fixing sleeve near the vertical tube. The upper, lower and front and back directions of the outer periphery of the fixing sleeve can be provided with screw holes or pre-embedded with protruding screws; the vertical tube is provided with a corresponding positioning hole for the positioning block to be inserted, and it is ensured that each screw hole or screw is located in the upper, lower and front and back directions of the fixing sleeve. When the support partition is placed above the longitudinally adjacent horizontal tubes, it is locked to the top of each fixing sleeve. The left and right baffles of the outer baffle are respectively locked to the side of the riser, and the rear baffles are respectively locked to the rear side of each fixing sleeve; a fixing plate is locked to the front side of each fixing sleeve on the left or right side of the frame structure, and the door panel is hinged to the fixing plate.

14. The easily expandable frame structure according to claim 1, characterized in that: The end of the double-headed screw that extends out of the riser and is located on the outside of the frame structure is limited by a locking nut.

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