A handle foldable wheeled stacker cart

Abstract

The application discloses a handle foldable wheeled stacking cart, which comprises a handle adjusting device, a cart support is fixedly connected to the bottom of the handle adjusting device, a wheel fixing device is fixedly connected to the bottom of the cart support, a limiting stacking device is fixedly connected to the top of the cart support, a universal wheel stacking groove is formed in the side of the top of the cart support, away from the handle adjusting device, a directional wheel stacking groove is formed in the side of the top of the cart support, close to the handle adjusting device, and a universal wheel limiting hole is formed in the top of the cart support, and the application relates to the technical field of AGV automatic handling robots, and the handle foldable wheeled stacking cart is accurately controlled by an automatic device, an extrusion force is applied to the spring positioning pin, the spring positioning pin is separated from the pin hole at the connection position of the handle and the bottom plate, so that the fixed state of the handle is released, the automatic device further drives the sleeve to rotate the hexagonal bolt on the handle, the handle is rotated and folded by utilizing the thread cooperation between the bolt and the nut.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of AGV automatic handling robot, in particular to a handle foldable wheeled stacking trolley. BACKGROUND

[0002] The present application belongs to the technical field of AGV automatic handling robot or wheeled trolley used in the process of artificial material transfer, used in the handling field of logistics and warehousing, the load capacity is usually above 600 kg, similar to the existing flat trolley on the market, and different from the folding car of ordinary household, outdoor travel storage, shopping, baby carriage, etc. At present, there is no effective scheme for the storage and storage of such trolleys. A large number of empty trolleys generated after a large number of trolley storage or warehouse operation cannot be effectively stored and stored, and need to be stacked on flat ground, occupying a large area. The future development trend of trolley is to make it more convenient to store by modifying the trolley itself, save storage space, and improve space utilization. The main problem existing at present is that the existing market wheeled trolley cannot be effectively stacked, and the trolley and the trolley cannot be effectively fixed after stacking. Because there are wheels at the bottom of the trolley, the stacked trolleys are prone to sliding and tilting during transfer, which poses a risk of injury.

[0003] The present application aims to make the trolley more convenient to stack and store by modifying the trolley itself, thereby reducing the working space occupied by the trolley. Therefore, we propose a handle foldable wheeled stacking trolley. SUMMARY

[0004] In order to achieve the above purpose, the present application is realized by the following technical scheme: a handle foldable wheeled stacking trolley, comprising a handle adjusting device, the bottom of the handle adjusting device is fixedly connected with a trolley support, the bottom of the trolley support is fixedly connected with a wheel fixing device, the top of the trolley support is fixedly connected with a limiting stacking device, the top of the trolley support is provided with a universal wheel stacking groove on the side away from the handle adjusting device, the top of the trolley support is provided with a directional wheel stacking groove on the side close to the handle adjusting device, and the top of the trolley support is provided with a universal wheel limiting hole.

[0005] The handle adjusting device comprises a folding mechanism, the top of the folding mechanism is fixedly connected with a telescopic mechanism, the top of the telescopic mechanism is fixedly connected with a stroller handle, the bottom of the folding mechanism is fixedly connected with the top of a stroller support, the folding mechanism comprises a handle fixing seat, one side of the handle fixing seat is provided with a pin hole, the side close to the pin hole of the handle fixing seat is sleeved and rotationally connected with a handle rotating shaft, the handle rotating shaft is sleeved and rotationally connected with a rotating fixing block, one side of the rotating fixing block is penetrated and threadedly connected with a spring pin, the spring pin is sleeved and threadedly connected with a hexagonal bolt, the advantages of automatic technology and mechanical structure design are combined, the quick and convenient folding of the handle is realized, the automatic equipment is used for accurate control, the spring positioning pin is subjected to extrusion force, the spring positioning pin is separated from the pin hole at the connection position of the handle and the bottom plate, so that the fixing state of the handle is released, at the same time, the automatic equipment also drives the sleeve to rotate the hexagonal bolt on the handle, the thread cooperation between the bolt and the nut is utilized, the rotation and folding of the handle are realized, the whole process does not need manual intervention, not only the operation efficiency is improved, but also the operation difficulty and risk are reduced, one side of the rotating fixing block is sleeved and threadedly connected with a pin, the bottom of the handle fixing seat is fixedly connected with the top of the stroller support, the telescopic mechanism comprises a round rod, the top of the round rod is provided with a rectangular groove, the positions of the top of the round rod on both sides of the rectangular groove are rotationally connected with rotating limiting blocks, the side surface of the rotating limiting block is provided with a groove, the inner wall of the groove is fixedly connected with an electric push rod, the movable end of the electric push rod is fixedly connected with a plug, the inner wall of the rectangular groove is rotationally connected with a rotating sleeve rod through a rotating bolt, the rotating sleeve rod can realize the adjustment of the angle of the handle, the handle can be adjusted to a suitable angle according to the actual operation requirement and the use habit of the staff, three round holes are formed in the surface, the handle height can be adjusted in cooperation with the telescopic rod, the use requirement of staffs with different heights can be met, one side of the rotating sleeve rod close to the rotating limiting block is provided with a plug hole, one side of the rotating sleeve rod is provided with a round hole, the inner wall of the rotating sleeve rod is slidably connected with a telescopic rod, one side of the telescopic rod close to the round hole is provided with a round groove, the inner wall of the round groove is fixedly connected with a spring, the end of the spring away from the round groove is fixedly connected with a limiting sleeve, the limiting sleeve is clamped on the round hole of the rotating sleeve rod, the height of the telescopic rod is limited, so that the handle can be kept stable after being adjusted to a suitable height, the top is round, when the height is adjusted, the telescopic rod can be adjusted by compressing the two ends, the operation is simple and convenient, the handle height can be quickly adjusted to adapt to different use requirements, the bottom of the round rod is fixedly connected with the top of the rotating fixing block, the round hole is provided with three round holes, and the three round holes are arranged on one side of the rotating sleeve rod.

[0006] Further, the wheel fixing device comprises support leg frame one and support leg frame two, the bottom of the support leg frame one is fixedly connected with a directional wheel, the bottom of the support leg frame two is fixedly connected with a universal wheel, one side of the support leg frame two is fixedly connected with a foldable fixing plate, the bottom of the foldable fixing plate is penetrated and threadedly connected with a trolley limiting pin, a unique wheel limiting device is designed on the upper surface of the trolley, which can realize accurate positioning and locking of the wheels, by setting grooves or clamping grooves matched with the shape of the wheels and a locking mechanism, the stability and safety of the wheels during stacking are ensured, this design not only improves the efficiency and accuracy of the trolley stacking, but also avoids the risk of wheel slipping or rotating during transportation, a positioning pin is arranged in the inner side of the trolley universal wheel, and a pin hole is arranged on the corresponding position of the upper surface of the chassis, this design enables the trolley to realize more accurate positioning and locking through the cooperation of the positioning pin and the pin hole during stacking, this accurate positioning not only improves the stability of the trolley stacking, but also simplifies the stacking operation process, reduces the operation difficulty and risk, the top of the support leg frame one is fixedly connected with the bottom of the trolley support, the top of the support leg frame two is fixedly connected with the bottom of the trolley support, the side wheel recessed clamping groove of the directional wheel is accurately calculated and processed, to ensure that its shape and size are perfectly matched with the trolley wheels, when the trolley is stacked, the wheels of the upper trolley will naturally fall into the corresponding clamping groove on the bottom plate of the lower trolley, forming stable support and positioning, this design effectively limits the front-back and left-right rotation of the wheels in the stacked state, avoiding the instability of the stack caused by mispositioning of the wheels, the side wheel recessed clamping groove of the universal wheel also has a certain depth and width to better accommodate and fix the wheels, this design not only increases the contact area between the wheels and the clamping grooves, enhances the stability of the stack, but also can reduce the impact caused by gravity during trolley stacking to a certain extent, protecting the wheels and clamping grooves from damage.

[0007] Further, the limiting stacking device comprises a trolley bottom plate, the top of the trolley bottom plate is fixedly connected with a stacking limiting block, the stacking limiting block can ensure that there is sufficient spacing for each stacking position when the goods on the tray are stacked, so that the stacking is more orderly and standardized, which is conducive to the reasonable use of space and facilitates subsequent handling, storage and other operations, and provides a clear boundary and positioning reference for the stacked goods, which helps the operator to accurately place the goods and improves the efficiency and accuracy of stacking, both sides of the stacking limiting block are fixedly connected with friction plates one, one side of the friction plate one away from the stacking limiting block is fixedly connected with an arc-shaped elastic sheet one, the outer side of the arc-shaped elastic sheet one is fixedly connected with a friction plate two, the wave pattern on the surface of the friction plate two further increases the friction between the stacked goods, which can more effectively prevent the goods from shifting during stacking, one side of the friction plate two close to the arc-shaped elastic sheet one is fixedly connected with an arc-shaped elastic sheet two, when the stacked goods are subjected to extrusion, the arc-shaped elastic sheet one and the arc-shaped elastic sheet two can disperse the pressure along the arc-shaped surface, more evenly bear the pressure, effectively buffer and absorb the pressure, protect the stacked goods from damage caused by excessive extrusion pressure, the inner side of the arc-shaped elastic sheet one is fixedly connected with a rubber strip, the rubber strip plays a connecting and reinforcing role between the arc-shaped elastic sheet one and the arc-shaped elastic sheet two, prevents the arc-shaped elastic sheet from breaking due to excessive deformation during deformation, prolongs the service life of the arc-shaped elastic sheet, the rubber strip itself also has certain elasticity and buffering performance, on the basis of the arc-shaped elastic sheet buffering the pressure, can further supplement the buffering effect, improve the protection effect on the stacked goods, the top of the trolley bottom plate is provided with a rectangular hole, the bottom of the trolley bottom plate is fixedly connected with the top of the trolley support, one side of the friction plate one close to the arc-shaped elastic sheet one is fixedly connected with the inner side of the arc-shaped elastic sheet two, the inner side of the arc-shaped elastic sheet two is fixedly connected with one side of the rubber strip.

[0008] The present application provides a handle foldable wheeled stacking trolley.

[0009] 1. The handle foldable wheeled stacking trolley is provided with precise control by automatic equipment, which applies extrusion force to the spring positioning pin to make it separate from the pin hole at the connection between the handle and the bottom plate, thereby releasing the fixed state of the handle, at the same time, the automatic equipment also drives the sleeve to rotate the hexagonal bolt on the handle, and realizes the rotation and folding of the handle by the thread cooperation between the bolt and the nut, the whole process does not need manual intervention, not only improves the operation efficiency, but also reduces the operation difficulty and risk, a unique wheel limiting device is designed on the surface of the trolley, which can realize accurate positioning and locking of the wheels, by setting grooves or clamping grooves matching the shape of the wheels and a locking mechanism, the stability and safety of the wheels during stacking are ensured, the stacking limiting block can ensure that there is sufficient spacing for each stacking position when the goods on the tray are stacked, so that the stacking is more orderly and standardized, which is conducive to the reasonable use of space.

[0010] 2. The handle foldable wheeled stacking cart is provided with a handle adjusting device, which combines the advantages of automation technology and mechanical structure design, realizes the quick and convenient folding of the handle, and the method accurately controls the spring positioning pin through automatic equipment to apply extrusion force to make it separate from the pin hole at the connection between the handle and the bottom plate, so as to release the fixing state of the handle. At the same time, the automatic equipment also drives the sleeve to rotate the hexagonal bolt on the handle. The thread cooperation between the bolt and the nut realizes the rotation and folding of the handle. The whole process does not need manual intervention, which not only improves the operation efficiency, but also reduces the operation difficulty and risk. The rotating sleeve can adjust the angle of the handle. According to the actual operation demand and the use habit of the staff, the handle can be adjusted to the appropriate angle. Three round holes are opened on the surface, which can cooperate with the telescopic rod to realize the height adjustment of the handle, so as to meet the use demand of staffs with different heights. The limiting sleeve limits the height of the telescopic rod by clamping the round hole on the rotating sleeve, so as to ensure that the handle remains stable after being adjusted to the appropriate height. The top is round, which can slide the telescopic rod to adjust the height when the height is adjusted, so the operation is simple and convenient, and the height of the handle can be quickly adjusted to adapt to different use demands.

[0011] 3. The handle foldable wheeled stacking cart is provided with a wheel fixing device. A unique wheel limiting device is designed on the upper surface of the cart. The device can realize accurate positioning and locking of the wheels. By setting grooves or clamping grooves matching the shape of the wheels and locking mechanisms, the stability and safety of the wheels during stacking are ensured. This design not only improves the efficiency and accuracy of the cart stacking, but also avoids the risk of wheel slipping or rotating during transportation. A positioning pin is arranged on the side of the universal wheel, and a pin hole is arranged on the corresponding position of the bottom plate. This design enables the cart to be more accurately positioned and locked through the cooperation of the positioning pin and the pin hole during stacking. This accurate positioning not only improves the stability of the cart stacking, but also simplifies the stacking operation process, reduces the operation difficulty and risk. The directional wheel side wheel recess clamping groove is accurately calculated and processed to ensure that its shape, size and cart wheel perfectly match. When the cart is stacked, the wheels of the upper cart will naturally fall into the corresponding clamping groove on the bottom plate of the lower cart, forming a stable support and positioning. This design effectively limits the front, back, left and right rotation of the wheels in the stacked state, avoiding the instability of the stack due to misalignment of the wheels. The directional wheel side wheel recess clamping groove also has a certain depth and width to better accommodate and fix the wheels. This design not only increases the contact area between the wheels and the clamping grooves, enhances the stability of the stacking, but also to some extent, reduces the impact generated by gravity during the stacking of the cart, protects the wheels and clamping grooves from damage.

[0012] 4. This wheeled stacking cart with a foldable handle is equipped with a limited stacking device. The stacking limit block can ensure that each stacking position on the pallet has sufficient spacing when stacking items, making the stacking more neat and standardized, which is conducive to the rational use of space and convenient for subsequent handling, storage and other operations. It provides a clear boundary and positioning reference for the stacked items, helps operators to place items accurately, and improves the efficiency and accuracy of stacking. When the stacked items are squeezed, the arc-shaped spring piece 1 and the arc-shaped spring piece 2 can disperse the pressure along the arc surface, so that the pressure is more evenly absorbed and effectively buffered. and absorb pressure, protecting the stacked items from damage due to excessive squeezing force. The corrugated pattern on the surface of the second friction plate further increases the friction between the stacked items and can more effectively prevent the items from shifting during the stacking process. The rubber strip plays a connecting and reinforcing role between the first and second arc-shaped spring pieces, preventing the arc-shaped spring pieces from breaking due to excessive deformation during the deformation process, thereby extending the service life of the arc-shaped spring pieces. The rubber strip itself also has certain elasticity and buffering performance. On the basis of the arc-shaped spring piece buffering pressure, it can further supplement the buffering effect and improve the protection of the stacked items. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a wheeled stacking cart with foldable handles according to the present invention;

[0014] Figure 2 This is a schematic side view of the structure of the wheeled stacking cart with foldable handles of the present invention;

[0015] Figure 3 This is a schematic structural diagram of the handle adjustment device of the present invention;

[0016] Figure 4 This is a schematic diagram of the folding mechanism structure of the present invention;

[0017] Figure 5 This is a schematic structural diagram of the telescopic mechanism of the present invention;

[0018] Figure 6 This is an enlarged structural diagram of the telescopic mechanism A of the present invention;

[0019] Figure 7 Schematic diagram of the cross-sectional structure of the telescopic mechanism of the present invention;

[0020] Figure 8 This is an enlarged structural diagram of the telescopic mechanism section B of the present invention;

[0021] Figure 9 This is a schematic structural diagram of the wheel fixing device of the present invention;

[0022] Figure 10 This is a schematic side structural diagram of the wheel fixing device of the present invention;

[0023] Figure 11 Structure diagram of the limiting stacking device of the application;

[0024] Figure 12 Structure diagram of the limiting stacking device C of the application.

[0025] In the figure: 1, handle adjusting device; 2, trolley support; 3, wheel fixing device; 4, limiting stacking device; 5, universal wheel stacking groove; 6, directional wheel stacking groove; 7, universal wheel limiting hole; 11, folding mechanism; 12, telescopic mechanism; 13, trolley handle; 111, handle fixing seat; 112, pin hole; 113, handle rotating shaft; 114, rotating fixing block; 115, spring pin; 116, hexagonal bolt; 117, pin; 121, round rod; 122, rectangular groove; 123, rotating limiting block; 124, groove; 125, electric push rod; 126, plug; 127, rotating sleeve rod; 128, insertion hole; 129, round hole; 1210, telescopic rod; 1211, round groove; 1212, spring; 1213, limiting sleeve; 31, support leg frame one; 32, directional wheel; 33, support leg frame two; 34, universal wheel; 35, folding fixing plate; 36, trolley limiting pin; 41, trolley bottom plate; 42, stacking limiting block; 43, friction plate one; 44, arc-shaped elastic sheet one; 45, friction plate two; 46, arc-shaped elastic sheet two; 47, rubber strip; 48, rectangular hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0027] First embodiment, please refer to Figures 1-8 The application is a handle foldable wheeled stacking trolley, which comprises a handle adjusting device 1, the bottom of the handle adjusting device 1 is fixedly connected with a trolley support 2, the bottom of the trolley support 2 is fixedly connected with a wheel fixing device 3, the top of the trolley support 2 is fixedly connected with a limiting stacking device 4, the top of the trolley support 2 is provided with a universal wheel stacking groove 5 on the side away from the handle adjusting device 1, the top of the trolley support 2 is provided with a directional wheel stacking groove 6 on the side close to the handle adjusting device 1, and the top of the trolley support 2 is provided with a universal wheel limiting hole 7.

[0028] The handle adjusting device 1 comprises a folding mechanism 11, the top of the folding mechanism 11 is fixedly connected with a telescopic mechanism 12, the top of the telescopic mechanism 12 is fixedly connected with a stroller handle 13, the bottom of the folding mechanism 11 is fixedly connected with the top of the stroller support 2, the folding mechanism 11 comprises a handle fixing seat 111, one side of the handle fixing seat 111 is provided with a pin hole 112, the side, close to the pin hole 112, of the handle fixing seat 111 is sleeved and rotationally connected with a handle rotating shaft 113, the handle rotating shaft 113 is sleeved and rotationally connected with a rotating fixing block 114, one side of the rotating fixing block 114 is penetrated and screw-connected with a spring pin 115, the spring pin 115 is sleeved and screw-connected with a hexagonal bolt 116, one side of the rotating fixing block 114 is sleeved and screw-connected with a pin 117, the bottom of the handle fixing seat 111 is fixedly connected with the top of the stroller support 2, the telescopic mechanism 12 comprises a round rod 121, the top of the round rod 121 is provided with a rectangular groove 122, the top of the round rod 121 is rotationally connected with rotating limiting blocks 123 at positions on both sides of the rectangular groove 122, the side surface of the rotating limiting block 123 is provided with a groove 124, the inner wall of the groove 124 is fixedly connected with an electric push rod 125, the movable end of the electric push rod 125 is fixedly connected with an insertion block 126, the inner wall of the rectangular groove 122 is rotationally connected with a rotating sleeve rod 127 through a rotating bolt, the side, close to the rotating limiting block 123, of the rotating sleeve rod 127 is provided with an insertion hole 128, one side of the rotating sleeve rod 127 is provided with a circular hole 129, the inner wall of the rotating sleeve rod 127 is slidingly connected with a telescopic rod 1210, one side of the telescopic rod 1210, close to the circular hole 129, is provided with a circular groove 1211, the inner wall of the circular groove 1211 is fixedly connected with a spring 1212, one end of the spring 1212, away from the circular groove 1211, is fixedly connected with a limiting sleeve 1213, the bottom of the round rod 121 is fixedly connected with the top of the rotating fixing block 114, the circular hole 129 is provided with three, and the three circular holes 129 are distributed on one side of the rotating sleeve rod 127, in use, when normally stacking, the staff can adjust the height and angle of the handle through the handle adjusting device 1 according to the height of the staff, the limiting stacking device 4 prevents the stacked articles from deviating, when the stroller needs to be stacked, the handle adjusting device 1 adjusts the handle to be stacked, the wheel fixing device 3 fixes the stroller, preventing the stroller from falling, when the stroller handle 13 is in the normal reset (i.e. open) state, the spring pin 115 will automatically insert into the pin hole 112 of the bottom plate connecting piece, forming a firm mechanical locking, ensuring that the handle can be stably kept in the open position, facilitating daily use and operation, this design not only simplifies the fixing method of the handle, but also significantly improves the stability of the handle in the open state, when the stroller handle 13 needs to be folded to save space or facilitate transportation, the automatic folding mechanism is introduced to realize this process, the mechanism is provided with a striker device, when the folding operation is started, the striker will accurately act on the spring pins 115 on both sides of the handle and the bottom plate connection,The handle 13 is unlocked and loses the fixed point, creating conditions for subsequent folding operation, in order to complete the folding of the handle 13, the hexagonal bolt structure connected with the handle 13 is designed, after the spring pin 115 is separated, the automatic equipment will take over the subsequent operation, the hexagonal bolt 116 is rotated to drive the handle to rotate around its axis until the predetermined folding position is reached, this process realizes the automation and precise control of handle folding, greatly improving the work efficiency and convenience, the opening process of the present application is opposite to the folding process, when the folded stroller handle needs to be opened again, the above steps are operated in reverse, first, the hexagonal bolt 116 is reversely rotated by the automatic equipment to make the handle return to the initial position, then the spring pin 115 is inserted into the pin hole 112 of the bottom plate connector by the natural elastic force, realizing the stable locking of the handle, the design of the pin hole 112 adopts the combination of chamfering and counterbore flared mouth, the inside of the pin hole 112 is finely chamfered to reduce the resistance and friction when the pin is inserted, and to protect the pin and the pin 117 from damage, and the outside is designed in the shape of a counterbore flared mouth, this design not only facilitates the quick and accurate positioning and insertion of the pin of the automatic equipment, but also can guide the movement trajectory of the pin to a certain extent, ensuring that the spring pin 115 can be smoothly ejected from the bottom plate and the handle fixing seat 111 every time, effectively releasing the limit, laying a solid foundation for subsequent folding operation, in the design of the rotating bolt, the hexagonal bolt 116 is selected as the core component, and an internal hexagonal sleeve is matched on the outside, the advantage of this design combination is that the internal hexagonal sleeve can tightly fit the six sides of the hexagonal bolt 116, forming a stable connection interface, during the rotation of the handle, the tight fit between the internal hexagonal sleeve and the hexagonal bolt 116 can effectively prevent relative sliding between the two structural components, the rotating sleeve 127 can adjust the handle angle, when adjustment is not needed, the plug 126 is located inside the insertion hole 128 for limiting, when adjustment is needed, the electric push rod 125 is started to retract the plug 126, releasing the limitation of the rotating sleeve 127, the rotating sleeve 127 can be arbitrarily rotated and adjusted, when rotated to 90°, the rotating limiting block 123 locks the rotating sleeve 127 to prevent the rotating sleeve 127 from rotating when moving, the length of the handle can be adjusted according to the height of the worker, three round holes 129 are provided on the rotating sleeve 127 for different heights, the telescopic rod 1210 is moved to the desired height, the pressure of the spring 1212 compressed in the rotating sleeve 127 disappears, driving the limiting sleeve 1213 to clamp the corresponding round hole 129, the limiting sleeve 1213 is tapered, when adjusting, compressing the two ends inward, the telescopic rod 1210 can be adjusted in height again.

[0029] The second embodiment, please refer toFigures 1-12 The present application provides a folding wheel type stacking cart, which comprises a wheel fixing device 3, a supporting leg frame 1 31 and a supporting leg frame 2 33, the bottom of the supporting leg frame 1 31 is fixedly connected with a directional wheel 32, the bottom of the supporting leg frame 2 33 is fixedly connected with a universal wheel 34, one side of the supporting leg frame 2 33 is fixedly connected with a folding fixed plate 35, the bottom of the folding fixed plate 35 is penetrated and screw-connected with a cart limiting pin 36, the top of the supporting leg frame 1 31 is fixedly connected with the bottom of a cart support 2, and the top of the supporting leg frame 2 33 is fixedly connected with the bottom of the cart support 2.

[0030] The limiting code stacking device 4 includes a trolley bottom plate 41, the top of the trolley bottom plate 41 is fixedly connected with a stacking limiting block 42, the two sides of the stacking limiting block 42 are fixedly connected with a friction plate one 43, the side, away from the stacking limiting block 42, of the friction plate one 43 is fixedly connected with an arc-shaped elastic sheet one 44, the outer side of the arc-shaped elastic sheet one 44 is fixedly connected with a friction plate two 45, the side, close to the arc-shaped elastic sheet one 44, of the friction plate two 45 is fixedly connected with an arc-shaped elastic sheet two 46, the inner side of the arc-shaped elastic sheet one 44 is fixedly connected with a rubber strip 47, the top of the trolley bottom plate 41 is provided with a rectangular hole 48, the bottom of the trolley bottom plate 41 is fixedly connected with the top of the trolley support 2, the side, close to the arc-shaped elastic sheet one 44, of the friction plate one 43 is fixedly connected with the inner side of the arc-shaped elastic sheet two 46, the inner side of the arc-shaped elastic sheet two 46 is fixedly connected with the side of the rubber strip 47, in use, the side wheel recessed clamping groove of the directional wheel 32 is accurately calculated and processed, to ensure that its shape and size are perfectly matched with the trolley wheel, when the trolley is stacked, the wheels of the upper trolley will naturally fall into the corresponding clamping grooves on the bottom plate of the lower trolley, to form stable support and positioning, this design effectively limits the front-back and left-right rotation of the wheels in the stacked state, avoids the instability of the stack due to the misalignment of the wheels, the side wheel recessed clamping groove of the universal wheel 34 also has a certain depth and width, to better accommodate and fix the wheels, this design not only increases the contact area between the wheels and the clamping grooves, enhances the stability of the stack, but also reduces the impact caused by gravity when the trolley is stacked to a certain extent, to protect the wheels and clamping grooves from damage, the present application introduces the innovative trolley limiting pin 36 and universal wheel limiting hole 7 nesting structure in the trolley design, this design not only enhances the connection strength when the trolley is stacked, but also ensures the accuracy and stability of the stack, one trolley limiting pin 36 is arranged on the inner side of each rear wheel of the trolley, the trolley limiting pin 36 is designed as a conical top, to facilitate insertion and fixation in the preset position, at the same time, the corresponding universal wheel limiting hole 7 is arranged on the corresponding position of the trolley bottom plate, the top of the sleeve is designed as a trumpet shape, this design not only facilitates the smooth insertion of the pin, but also forms a tight nesting structure after insertion, to prevent the pin from coming out under the action of vibration or external force, when the trolley is stacked, the fixed pin of the upper trolley will naturally fall into the corresponding sleeve on the bottom plate of the lower trolley, due to the close fit between the trolley limiting pin 36 and the universal wheel limiting hole 7 and the special design of the cone and the trumpet, the two can quickly form a stable hard link, this hard link not only can effectively resist external forces from all directions, but also can further reinforce the connection through the gravity of the trolley itself, to ensure the accuracy and stability of the stack during transportation, in addition, the nesting structure also has a certain fault tolerance, even if there is a slight deviation or misalignment during stacking, the special design between the two can adjust and adapt to a certain extent, to ensure that the stability of the connection is not affected, the trolley bottom plate 41 is provided with the stacking limiting block 42, to provide sufficient spacing for each stack position when stacking the goods on the tray,The two sides of the stacking limiting block 42 are fixedly connected with friction plate one 43, the friction plate two 45 is connected with the friction plate one 43 through arc spring one 44 and arc spring two 46, the surface of the friction plate two 45 is provided with wave lines, increase with, the friction between the stacking goods, prevent the goods from deviating, when the stacking goods are extruded, the arc spring one 44 and the arc spring two 46 are deformed, so that the pressure can be dispersed along the arc surface, so that the elastic sheet can more evenly and effectively buffer and absorb the pressure, the arc spring one 44 and the arc spring two 46 are fixedly connected with rubber strips 47 in the middle, prevent the arc spring from being deformed excessively and breaking.

[0031] Obviously, the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art and related fields without creative labor should belong to the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, if not specially described and limited, are implemented according to the conventional means in the art.

[0032] In use, when normally stacking, the height and angle of the handle can be adjusted by the handle adjusting device 1 according to the height of the staff, the stacking limiting device 4 prevents the stacked objects from deviating, when stacking the trolleys, the handle adjusting device 1 adjusts the handle to be stacked, the wheel fixing device 3 fixes the trolley and the trolley, preventing the trolley from falling, when the trolley handle 13 is in the normal reset (i.e. open) state, the spring pin 115 will automatically insert into the pin hole 112 of the bottom plate connector, forming a firm mechanical locking, ensuring that the handle can be stably kept in the open position, facilitating daily use and operation, this design not only simplifies the fixing method of the handle, but also significantly improves the stability of the handle in the open state, when the trolley handle 13 needs to be folded to save space or facilitate transportation, the automatic folding mechanism is introduced to realize this process, the mechanism is provided with a striker device, when the folding operation is started, the striker will accurately act on the spring pins 115 on both sides of the handle and the bottom plate connection, and the mechanical force will compress the spring pins 115 and make them separate from the pin hole 112 of the bottom plate connector, at this time, the originally locked trolley handle 13 loses the fixing point, creating conditions for subsequent folding operation, in order to complete the complete folding of the trolley handle 13, a hexagonal bolt structure connected with the trolley handle 13 is also designed, after the spring pins 115 are separated, the automatic equipment will take over the subsequent operation, the handle will be rotated around its axis by rotating the hexagonal bolt 116 until it reaches the predetermined folding position, this process realizes the automation and accurate control of the handle folding, greatly improving the work efficiency and convenience, the opening process of the invention is opposite to the folding process, when the folded trolley handle needs to be opened again, only the above steps are operated in reverse, first, the handle is returned to the initial position by reversing the hexagonal bolt 116 of the automatic equipment, then the spring pins 115 are reinserted into the pin hole 112 of the bottom plate connector by using the natural elastic force of the spring pins 115, realizing the stable locking of the handle, for the design of the pin hole 112, the combination of chamfering and flared mouth is adopted, the inside of the pin hole 112 is finely chamfered to reduce the resistance and friction when the striker is inserted, and to protect the striker and the pin 117 from damage, at the same time, the outside is designed in the shape of a flared mouth, this design not only facilitates the quick and accurate positioning and insertion of the striker of the automatic equipment, but also guides the movement trajectory of the striker to a certain extent, ensuring that the spring pins 115 can be smoothly ejected from the bottom plate and the handle fixing seat 111 every time, effectively unlocking the limit, laying a solid foundation for subsequent folding operation, in the design of the rotating bolt, the hexagonal bolt 116 is selected as the core component, and an internal hexagonal sleeve is matched on the outside, the advantage of this design combination is that the internal hexagonal sleeve can tightly fit the six sides of the hexagonal bolt 116, forming a stable connection interface, in the process of rotating the handle,The close fit between the inner hex socket sleeve and the hex bolt 116 can effectively prevent relative sliding between the two structural members. The rotating sleeve rod 127 can adjust the handle angle. When adjustment is not needed, the plug block 126 is positioned inside the insertion hole 128. When adjustment is needed, the electric push rod 125 is activated to retract the plug block 126, thereby releasing the limitation on the rotating sleeve rod 127. The rotating sleeve rod 127 can be arbitrarily rotated and adjusted. When the rotating sleeve rod 127 is rotated to 90°, the rotating limiting block 123 is locked to prevent the rotating sleeve rod 127 from rotating when moved. According to the height of the staff, the length of the handle can be adjusted. Three round holes 129 are provided on the rotating sleeve rod 127 for different heights. The telescopic rod 1210 is moved to the desired height. When the pressure of the spring 1212 compressed inside the rotating sleeve rod 127 disappears, the limiting sleeve 1213 is clamped to the corresponding round hole 129. The limiting sleeve 1213 is rounded at the top. When the adjustment is replaced, the two ends are compressed inward, and the telescopic rod 1210 can be adjusted in height again. The recessed clamping groove on one side of the directional wheel 32 is accurately calculated and processed to ensure that its shape and size are perfectly matched with the wheels of the trolley. When the trolley is stacked, the wheels of the upper trolley will naturally fall into the corresponding clamping groove on the bottom plate of the lower trolley, forming a stable support and positioning. This design effectively limits the forward, backward, left and right rotation of the wheels in the stacked state, avoiding the instability of the stack due to misalignment of the wheels. The recessed clamping groove on one side of the universal wheel 34 also has a certain depth and width to better accommodate and fix the wheels. This design not only increases the contact area between the wheels and the clamping groove, enhancing the stability of the stack, but also to some extent, reduces the impact generated by gravity when the trolley is stacked, protecting the wheels and clamping grooves from damage. The present application introduces an innovative trolley limiting pin 36 and universal wheel limiting hole 7 nesting structure in the trolley design. This design not only enhances the connection strength when the trolley is stacked, but also ensures the accuracy and stability of the stack. A trolley limiting pin 36 is provided on the inner side of each of the two rear wheels of the trolley. The trolley limiting pin 36 is designed with a tapered top to facilitate insertion and fixation in the pre-set position. At the same time, a corresponding universal wheel limiting hole 7 is provided on the corresponding position of the trolley bottom plate. The top of the sleeve is designed in a trumpet shape. This design not only facilitates the smooth insertion of the pin, but also forms a tight nesting structure after insertion, preventing the pin from coming out under vibration or external force. When the trolley is stacked, the fixed pin of the upper trolley will naturally fall into the corresponding sleeve on the bottom plate of the lower trolley. Due to the close fit between the trolley limiting pin 36 and the universal wheel limiting hole 7 and the special design of the taper and the trumpet, the two can quickly form a stable hard link. This hard link not only effectively resists external forces from all directions, but also further strengthens the connection through the gravity of the trolley itself, ensuring the accuracy and stability of the stack during transportation. In addition, the nesting structure also has a certain fault tolerance. Even if there is a slight deviation or misalignment during stacking,The special design between the two can also be self-adjusted and adapted to a certain extent, so as to ensure the stability of the connection. The bottom plate 41 of the cart is provided with a stacking limiting block 42. When the goods on the tray are stacked, each stacking position has sufficient spacing. The two sides of the stacking limiting block 42 are fixedly connected with a friction plate one 43. The friction plate two 45 is connected with the friction plate one 43 through the arc-shaped elastic piece one 44 and the arc-shaped elastic piece two 46. The surface of the friction plate two 45 is provided with a wave pattern, which increases the friction between the stacked goods and prevents the goods from shifting. When the stacked goods are pressed, the arc-shaped elastic piece one 44 and the arc-shaped elastic piece two 46 are deformed, so that the pressure can be dispersed along the arc-shaped surface, so that the elastic piece can more evenly and effectively buffer and absorb the pressure. The arc-shaped elastic piece one 44 and the arc-shaped elastic piece two 46 are fixedly connected with a rubber strip 47 in the middle, which prevents the arc-shaped elastic piece from being deformed too much and broken.

[0033] Obviously, the embodiments described are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art and related fields without creative labor should belong to the scope of protection of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to the conventional means in the art, unless otherwise specified and limited.

Claims

1. A wheeled stacking trolley with a foldable handle, comprising a handle adjustment device (1), characterized in that: The bottom of the handle adjustment device (1) is fixedly connected to a trolley bracket (2), the bottom of the trolley bracket (2) is fixedly connected to a wheel fixing device (3), the top of the trolley bracket (2) is fixedly connected to a limited stacking device (4), a universal wheel stacking groove (5) is provided on the side of the top of the trolley bracket (2) away from the handle adjustment device (1), a directional wheel stacking groove (6) is provided on the side of the top of the trolley bracket (2) close to the handle adjustment device (1), and a universal wheel limiting hole (7) is provided on the top of the trolley bracket (2); The handle adjustment device (1) comprises a folding mechanism (11), the bottom of the folding mechanism (11) being fixedly connected to the top of the cart bracket (2); The folding mechanism (11) includes a handle fixing seat (111), a pin hole (112) is provided on one side of the handle fixing seat (111), a handle rotating shaft (113) is sleeved and rotatably connected on one side of the handle fixing seat (111) close to the pin hole (112), a rotating fixed block (114) is sleeved and rotatably connected on the handle rotating shaft (113), a spring pin (115) is passed through and threadedly connected on one side of the rotating fixed block (114), a hexagonal bolt (116) is sleeved and threadedly connected on the spring pin (115), a pin (117) is sleeved and threadedly connected on one side of the rotating fixed block (114), and the bottom of the handle fixing seat (111) is fixedly connected to the top of the cart bracket (2); The wheel fixing device (3) comprises a supporting leg frame 1 (31) and a supporting leg frame 2 (33), wherein the bottom of the supporting leg frame 1 (31) is fixedly connected to a fixed wheel (32), the bottom of the supporting leg frame 2 (33) is fixedly connected to a universal wheel (34), one side of the supporting leg frame 2 (33) is fixedly connected to a folding fixing plate (35), and the bottom of the folding fixing plate (35) is penetrated and threadedly connected to a cart limit pin (36); The top of the folding mechanism (11) is fixedly connected to a telescopic mechanism (12); The telescopic mechanism (12) comprises a round rod (121), a rectangular groove (122) is provided on the top of the round rod (121), and positions on both sides of the top of the round rod (121) on the rectangular groove (122) are rotatably connected to rotational limit blocks (123), a groove (124) is provided on the side of the rotational limit block (123), an electric push rod (125) is fixedly connected to one side of the inner wall of the groove (124), and an insert block (126) is fixedly connected to the movable end of the electric push rod (125), and a rotational sleeve rod (127) is rotationally connected to the inner wall of the rectangular groove (122) via a rotation bolt, and a socket (128) is provided on the side of the rotational sleeve rod (127) close to the rotational limit block (123).

2. A wheeled stacking cart with foldable handles according to claim 1, characterized in that: The top of the telescopic mechanism (12) is fixedly connected to a trolley handle (13).

3. A wheeled stacking cart with foldable handles according to claim 1, characterized in that: A circular hole (129) is provided on one side of the rotating sleeve rod (127); a telescopic rod (1210) is slidably connected to the inner wall of the rotating sleeve rod (127); a circular groove (1211) is provided on the side of the telescopic rod (1210) close to the circular hole (129); a spring (1212) is fixedly connected to the inner wall of the circular groove (1211); and an end of the spring (1212) away from the circular groove (1211) is fixedly connected to a limiting sleeve (1213).

4. The wheeled stacking cart with foldable handles according to claim 3, characterized in that: The bottom of the round rod (121) is fixedly connected to the top of the rotating fixed block (114), and three round holes (129) are provided, and the three round holes (129) are distributed on one side of the rotating sleeve rod (127).

5. The wheeled stacking cart with foldable handles according to claim 1, characterized in that: The top of the supporting leg frame 1 (31) is fixedly connected to the bottom of the trolley bracket (2), and the top of the supporting leg frame 2 (33) is fixedly connected to the bottom of the trolley bracket (2).

6. The wheeled stacking cart with foldable handles according to claim 1, characterized in that: The position limiting stacking device (4) comprises a cart bottom plate (41), the top of the cart bottom plate (41) is fixedly connected to a stacking limit block (42), both sides of the stacking limit block (42) are fixedly connected to friction plates 1 (43), the side of the friction plate 1 (43) away from the stacking limit block (42) is fixedly connected to an arc-shaped spring piece 1 (44), the outer side of the arc-shaped spring piece 1 (44) is fixedly connected to friction plate 2 (45), the side of the friction plate 2 (45) close to the arc-shaped spring piece 1 (44) is fixedly connected to an arc-shaped spring piece 2 (46), the inner side of the arc-shaped spring piece 1 (44) is fixedly connected to a rubber strip (47), and a rectangular hole (48) is opened on the top of the cart bottom plate (41).

7. The wheeled stacking cart with foldable handles according to claim 6, characterized in that: The bottom of the cart bottom plate (41) is fixedly connected to the top of the cart bracket (2), the side of the friction plate 1 (43) close to the arc-shaped spring piece 1 (44) is fixedly connected to the inner side of the arc-shaped spring piece 2 (46), and the inner side of the arc-shaped spring piece 2 (46) is fixedly connected to one side of the rubber strip (47).

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