Wheel type stacking cart with foldable handle

Abstract

The wheel type stacking cart comprises a handle adjusting device, the bottom of the handle adjusting device is fixedly connected with a cart support, the bottom of the cart support is fixedly connected with a wheel fixing device, and the top of the cart support is fixedly connected with a limiting stacking device. A universal wheel stacking groove is formed in the side, away from the handle adjusting device, of the top of the trolley support, a directional wheel stacking groove is formed in the side, close to the handle adjusting device, of the top of the trolley support, and a universal wheel limiting hole is formed in the top of the trolley support. According to the wheel type stacking cart with the foldable handle, through accurate control of automatic equipment, extrusion force is applied to the spring positioning pin, so that the spring positioning pin is separated from a pin hole in the connecting position of the handle and the bottom plate, the fixing state of the handle is relieved, and the automatic equipment further drives a sleeve to rotate a hexagon bolt on the handle; the rotation and folding of the handle are realized through the screw-thread fit between the bolt and the nut.

Description

Technical Field

[0001] The invention relates to the technical field of AGV automatic transport robots, in particular to a wheeled stacking cart with foldable handles. Background Art

[0002] The technical field to which the present invention belongs is a wheeled cart used in the process of AGV automatic handling robot or manual material transfer, which is used in the field of logistics warehousing and transportation, and has a load capacity of usually more than 600 kg. It is similar to the existing flatbed carts on the market, and is different from ordinary folding carts for household use, outdoor travel storage, shopping, baby strollers, etc. At present, there is no effective solution for the storage and storage of such carts. A large number of empty carts generated after large-scale cart storage or warehousing operations cannot be effectively stored and need to be stacked on the ground, occupying a large area. The future development trend of carts is to transform such carts themselves to make them more convenient to store, save storage space, and improve space utilization. The main problem currently existing is that the existing wheeled carts on the market cannot be effectively stacked, and the carts cannot be effectively fixed after stacking. Because there are wheels at the bottom of the carts, the stacked carts are prone to slipping and tilting during the transportation process, which poses a risk of injury. The present invention aims to transform the cart itself so that it can be stacked and stored more conveniently and reduce the working space occupied by the cart, so we propose a wheeled stacking cart with foldable handles. Summary of the invention

[0003] To achieve the above objectives, the present invention is implemented through the following technical solutions: a wheeled stacking cart with a foldable handle, comprising a handle adjustment device, a cart bracket fixedly connected to the bottom of the handle adjustment device, a wheel fixing device fixedly connected to the bottom of the cart bracket, a limited stacking device fixedly connected to the top of the cart bracket, a universal wheel stacking groove is provided on the top of the cart bracket away from the handle adjustment device, a directional wheel stacking groove is provided on the top of the cart bracket close to the handle adjustment device, and a universal wheel limiting hole is provided on the top of the cart bracket; The handle adjustment device comprises a folding mechanism, a telescopic mechanism is fixedly connected to the top of the folding mechanism, a cart handle is fixedly connected to the top of the telescopic mechanism, and the bottom of the folding mechanism is fixedly connected to the top of the cart bracket. The folding mechanism comprises a handle fixing seat, a pin hole is opened on one side of the handle fixing seat, a handle rotating shaft is sleeved and rotatably connected to the side of the handle fixing seat close to the pin hole, a rotating fixed block is sleeved and rotatably connected to the handle rotating shaft, a spring pin is penetrated and threadedly connected to one side of the rotating fixed block, and a hexagonal bolt is sleeved and threadedly connected to the spring pin. The advantages of automation technology and mechanical structure design are combined to realize the rapid adjustment of the handle. , convenient folding, this method uses precise control of automated equipment to apply extrusion force to the spring locating pin, so that it disengages 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 automated equipment also drives the sleeve to rotate the hexagonal bolt on the handle, and utilizes the threaded cooperation between the bolt and the nut to realize the rotation and folding of the handle. The whole process does not require manual intervention, which not only improves the operating efficiency, but also reduces the operating difficulty and risk. A pin is sleeved and threadedly connected on one side of the rotating fixed block, and the bottom of the handle fixing seat is fixedly connected to the top of the cart bracket. The telescopic mechanism includes a round rod, and a rectangular groove is opened on the top of the round rod. The top of the round rod is located at the rectangular groove. The positions on both sides of the rectangular groove are rotatably connected with a rotating limit block, and a groove is provided on the side of the rotating limit block, and an electric push rod is fixedly connected to one side of the inner wall of the groove, and the movable end of the electric push rod is fixedly connected to the plug block, and the inner wall of the rectangular groove is rotatably connected to a rotating sleeve rod through a rotating bolt, and the rotating sleeve rod can adjust the angle of the handle, and the handle can be adjusted to a suitable angle according to actual operation requirements and the usage habits of the staff. Three round holes are provided on its surface, and the handle height can be adjusted by cooperating with the telescopic rod to meet the usage needs of staff of different heights. A jack is provided on the side of the rotating sleeve rod close to the rotating limit block, and a round hole is provided on one side of the rotating sleeve rod. The inner wall of the rotating sleeve rod is slidably connected with a telescopic rod, and a circular groove is provided on the side of the telescopic rod close to the circular hole. A spring is fixedly connected to the inner wall of the circular groove, and the end of the spring away from the circular groove is fixedly connected to a limiting sleeve. The limiting sleeve limits the height of the telescopic rod by clamping the circular hole on the rotating sleeve rod, ensuring that the handle remains stable after being adjusted to a suitable height. The top end is rounded. When changing the adjustment height, the telescopic rod can be slid and readjusted by compressing the two ends inward. The operation is simple and convenient, and it is easy to quickly adjust the handle height to adapt to different usage requirements. The bottom of the round rod is fixedly connected to the top of the rotating fixed block. Three circular holes are provided, and the three circular holes are distributed on one side of the rotating sleeve rod.

[0004] Furthermore, the wheel fixing device includes a support leg frame 1 and a support leg frame 2, the bottom of the support leg frame 1 is fixedly connected with a fixed wheel, the bottom of the support leg frame 2 is fixedly connected with a universal wheel, one side of the support leg frame 2 is fixedly connected with a folding fixing plate, the bottom of the folding fixing plate passes through and is threadedly connected with a cart limiting pin, and a unique wheel limiting device is designed on the upper surface of the cart, which can achieve accurate positioning and locking of the wheels, and ensures the stability and safety of the wheels during stacking by setting grooves or slots matching the shape of the wheels and a locking mechanism. This design not only improves the efficiency and accuracy of cart stacking, but also avoids the risk of slipping or rotating of the wheels during transportation. A positioning pin is set on the inner side of the cart universal wheel, and a pin hole is set at a corresponding position on the upper surface of the chassis. This design enables the cart to be more accurately positioned and locked through the cooperation of the positioning pin and the pin hole when stacking. This precise positioning not only The stability of the stacking of carts is improved, the stacking operation process is simplified, and the operation difficulty and risk are reduced. The top of the supporting leg frame one is fixedly connected to the bottom of the cart bracket, and the top of the supporting leg frame two is fixedly connected to the bottom of the cart bracket. The wheel recessed card slot on one side of the directional wheel is accurately calculated and processed to ensure that its shape and size are perfectly matched with the cart wheel. When the carts are stacked, the wheels of the upper cart will naturally fall into the corresponding card slots on the bottom plate of the lower cart to form a stable support and positioning. This design effectively limits the front and rear left and right rotation of the wheels in the stacked state, and avoids the unstable stacking shape caused by wheel misalignment. The wheel recessed card slot on one side of the universal wheel also has a certain depth and width to better accommodate and fix the wheel. This design not only increases the contact area between the wheel and the card slot, and enhances the stability of the stacking, but also can reduce the impact caused by gravity when the carts are stacked to a certain extent, and protect the wheel and the card slot from damage.

[0005] Furthermore, the position limiting stacking device comprises a cart bottom plate, the top of which is fixedly connected with a stacking limit block, 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 is also convenient for subsequent handling, storage and other operations, providing a clear boundary and positioning reference for the stacked items, helping operators to accurately place items, and improving the efficiency and accuracy of stacking. The two sides of the stacking limit block are fixedly connected with friction plates 1, the side of the friction plate 1 away from the stacking limit block is fixedly connected with an arc-shaped spring piece 1, the outer side of the arc-shaped spring piece 1 is fixedly connected with a friction plate 2, the corrugated lines arranged on the surface of the friction plate 2 further increase the friction force between the stacked items and the stacked items, which can more effectively prevent the items from shifting during the stacking process, and the side of the friction plate 2 close to the arc-shaped spring piece 1 is fixedly connected with an arc-shaped spring piece 2. When the stacked objects are squeezed, the arc-shaped spring piece 1 and the arc-shaped spring piece 2 can disperse the pressure along the arc-shaped surface, bear the pressure more evenly, effectively buffer and absorb the pressure, and protect the stacked objects from damage by excessive squeezing force. The inner side of the arc-shaped spring piece 1 is fixedly connected with a rubber strip, and the rubber strip plays a connecting and reinforcing role between the arc-shaped spring piece 1 and the arc-shaped spring piece 2, so as to prevent the arc-shaped spring piece from breaking due to excessive deformation during the deformation process, thereby extending the service life of the arc-shaped spring piece. 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 objects. A rectangular hole is provided on the top of the cart bottom plate, and the bottom of the cart bottom plate is fixedly connected to the top of the cart bracket. The side of the friction plate 1 close to the arc-shaped spring piece 1 is fixedly connected to the inner side of the arc-shaped spring piece 2, and the inner side of the arc-shaped spring piece 2 is fixedly connected to one side of the rubber strip.

[0006] The present invention provides a wheeled stacking cart with foldable handles. The invention has the following beneficial effects: 1. A wheeled stacking trolley with a foldable handle is provided with a device which is precisely controlled by automated equipment to apply an extrusion force to the spring locating pin so that it disengages from the pin hole at the connection between the handle and the base plate, thereby releasing the fixed state of the handle. At the same time, the automated equipment also drives the sleeve to rotate the hexagonal bolt on the handle, and utilizes the threaded fit between the bolt and the nut to realize the rotation and folding of the handle. The entire process does not require manual intervention, which not only improves the operating efficiency but also reduces the operating difficulty and risk. A unique wheel limiting device is designed on the upper surface of the trolley, which can realize precise positioning and locking of the wheels. By setting grooves or card slots matching the shape of the wheels and a locking mechanism, the stability and safety of the wheels during the stacking process are ensured. 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.

[0007] 2. A wheeled stacking cart with a foldable handle is provided with a handle adjustment device, which combines the advantages of automation technology and mechanical structure design to achieve fast and convenient folding of the handle. The method uses precise control of automation equipment to apply extrusion force to the spring positioning pin to disengage it 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 automation equipment also drives the sleeve to rotate the hexagonal bolt on the handle, and utilizes the threaded cooperation between the bolt and the nut to achieve the rotation and folding of the handle. The whole process does not require manual intervention, which not only improves the operating efficiency, but also reduces the difficulty and Risk, the rotating sleeve can adjust the angle of the handle. The handle can be adjusted to a suitable angle according to actual operating requirements and the usage habits of the staff. There are three round holes on its surface, which can adjust the height of the handle in conjunction with the telescopic rod to meet the usage needs of staff of different heights. The limit sleeve limits the height of the telescopic rod by clamping the round holes on the rotating sleeve to ensure that the handle remains stable after being adjusted to the appropriate height. The top of the handle is rounded, and when changing the adjustment height, the two ends can be compressed inward to slide the telescopic rod to readjust. The operation is simple and convenient, and it is easy to quickly adjust the handle height to adapt to different usage requirements.

[0008] 3. A wheeled stacking cart with a foldable handle is provided with a wheel fixing device. A unique wheel limiting device is designed on the upper surface of the cart, which can realize accurate positioning and locking of the wheels. By setting grooves or card slots matching the shape of the wheels and a locking mechanism, the stability and safety of the wheels during the stacking process are ensured. This design not only improves the efficiency and accuracy of cart stacking, but also avoids the risk of wheels slipping or rotating during transportation. A positioning pin is provided on the inner side of the cart universal wheel, and a pin hole is provided at a corresponding position on the upper surface of the chassis. This design enables the cart to be more accurately positioned and locked through the cooperation of the positioning pin and the pin hole when stacking. This precise positioning not only improves the stability of the cart stacking, but also simplifies the stacking operation. The operation process is simplified, which reduces the difficulty and risk of operation. The wheel recessed slot on one side of the directional wheel has been precisely calculated and processed to ensure that its shape and size perfectly match the cart wheel. When the carts are stacked, the wheels of the upper cart will naturally fall into the corresponding slots on the bottom plate of the lower cart to form 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 unstable stacking caused by wheel misalignment. The wheel recessed slot on one side of the universal wheel also has a certain depth and width to better accommodate and fix the wheel. This design not only increases the contact area between the wheel and the slot and enhances the stability of the stack, but also can reduce the impact caused by gravity when the carts are stacked to a certain extent, protecting the wheels and the slot from damage.

[0009] 4. A wheeled stacking cart with a foldable handle is provided 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 is also 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, bear the pressure more evenly, and effectively buffer The rubber strip can absorb pressure and protect the stacked items from damage due to excessive squeezing force. The corrugated lines on the surface of the friction plate 2 further increase the friction between the stacked items and can more effectively prevent the items from shifting during the stacking process. The rubber strip connects and strengthens the arc spring piece 1 and the arc spring piece 2 to prevent the arc spring piece from breaking due to excessive deformation during the deformation process, thereby extending the service life of the arc spring piece. The rubber strip itself also has certain elasticity and buffering performance. On the basis of the arc spring piece buffering pressure, it can further supplement the buffering effect and improve the protection of the stacked items. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of a wheeled stacking cart with foldable handles according to the present invention; Figure 2 It is a schematic diagram of the side structure of the wheeled stacking cart with foldable handles of the present invention; Figure 3 It is a structural schematic diagram of the handle adjustment device of the present invention; Figure 4 It is a schematic diagram of the folding mechanism structure of the present invention; Figure 5 It is a schematic diagram of the telescopic mechanism structure of the present invention; Figure 6 This is an enlarged structural diagram of the telescopic mechanism A of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the telescopic mechanism of the present invention; Figure 8 It is an enlarged structural schematic diagram of the cross section B of the telescopic mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the wheel fixing device of the present invention; Fig.10 It is a schematic diagram of the side structure of the wheel fixing device of the present invention; Fig.11 This is a schematic diagram of the structure of the position limiting stacking device of the present invention; Fig.12 It is an enlarged structural schematic diagram of position C of the position-limiting stacking device of the present invention.

[0011] In the figure: 1. handle adjustment device; 2. trolley support; 3. wheel fixing device; 4. limited stacking device; 5. universal wheel stacking groove; 6. fixed wheel stacking groove; 7. universal wheel limited hole; 11. folding mechanism; 12. telescopic mechanism; 13. trolley handle; 111. handle fixing seat; 112. pin hole; 113. handle rotation axis; 114. rotation fixing block; 115. spring pin; 116. hexagonal bolt; 117. pin; 121. round rod; 122. rectangular groove; 123. rotation limit block; 124. groove; 125 , electric push rod; 126, plug block; 127, rotating sleeve rod; 128, socket; 129, round hole; 1210, telescopic rod; 1211, round groove; 1212, spring; 1213, limit sleeve; 31, support leg frame one; 32, directional wheel; 33, support leg frame two; 34, universal wheel; 35, folding fixing plate; 36, trolley limit pin; 41, trolley bottom plate; 42, stacking limit block; 43, friction plate one; 44, arc spring piece one; 45, friction plate two; 46, arc spring piece two; 47, rubber strip; 48, rectangular hole. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] For the first embodiment, please refer to Figure 1-Figure 8 The present invention is a wheeled stacking cart with a foldable handle, comprising a handle adjusting device 1, a cart bracket 2 is fixedly connected to the bottom of the handle adjusting device 1, a wheel fixing device 3 is fixedly connected to the bottom of the cart bracket 2, a limited stacking device 4 is fixedly connected to the top of the cart bracket 2, a universal wheel stacking groove 5 is provided on the side of the top of the cart bracket 2 away from the handle adjusting device 1, a directional wheel stacking groove 6 is provided on the side of the top of the cart bracket 2 close to the handle adjusting device 1, and a universal wheel limiting hole 7 is provided on the top of the cart bracket 2; The handle adjustment device 1 includes a folding mechanism 11, the top of the folding mechanism 11 is fixedly connected to a telescopic mechanism 12, the top of the telescopic mechanism 12 is fixedly connected to a cart handle 13, the bottom of the folding mechanism 11 is fixedly connected to the top of the cart bracket 2, the folding mechanism 11 includes a handle fixing seat 111, one side of the handle fixing seat 111 is provided with a pin hole 112, a handle rotating shaft 113 is sleeved and rotatably connected to the side of the handle fixing seat 111 close to the pin hole 112, a rotating fixed block 114 is sleeved and rotatably connected to the handle rotating shaft 113, a spring pin 115 is penetrated and threadedly connected to one side of the rotating fixed block 114, a hexagonal bolt 116 is sleeved and threadedly connected to the spring pin 115, and a hexagonal bolt 116 is sleeved and threadedly connected to one side of the rotating fixed block 114 The handle fixing seat 111 is threadedly connected with a pin 117, and the bottom of the handle fixing seat 111 is fixedly connected with the top of the cart bracket 2. The telescopic mechanism 12 includes a round rod 121, and a rectangular groove 122 is provided on the top of the round rod 121. The top of the round rod 121 is located on both sides of the rectangular groove 122 and is rotatably connected with a rotation limit block 123. A groove 124 is provided on the side of the rotation limit block 123. An electric push rod 125 is fixedly connected to one side of the inner wall of the groove 124. The movable end of the electric push rod 125 is fixedly connected to an insertion block 126. The inner wall of the rectangular groove 122 is rotatably connected to a rotating sleeve rod 127 through a rotating bolt. A socket 128 is provided on the side of the rotating sleeve rod 127 close to the rotating limit block 123, and a round hole 129 is provided on one side of the rotating sleeve rod 127. The inner wall of the sleeve rod 127 is slidably connected with a telescopic rod 1210, and a circular groove 1211 is provided on one 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 one end of the spring 1212 away from the circular groove 1211 is fixedly connected to a limiting sleeve 1213. The bottom of the round rod 121 is fixedly connected to the top of the rotating fixed block 114. There are three circular holes 129, and the three circular holes 129 are distributed on one side of the rotating sleeve rod 127. When in use, when it is used for normal stacking, the staff can adjust the height and angle of the handle through the handle adjustment device 1 according to their own height and other conditions. The limiting stacking device 4 prevents the stacked items from shifting. When the carts need to be stacked, the handle adjustment device 1 is adjusted to The wheel fixing device 3 fixes the cart to the cart to prevent tipping. When the cart handle 13 is in the normal reset (i.e. open) state, the spring pin 115 is automatically inserted into the pin hole 112 preset in the bottom plate connecting piece to form a firm mechanical lock, ensuring that the handle can be stably maintained in the open position, which is convenient for 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 cart handle 13 needs to be dropped and folded to save space or facilitate transportation, the present invention realizes this process by introducing an automatic folding mechanism. 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 connection between the handle and the bottom plate.It is compressed by mechanical force and disengaged from the pin hole 112 of the bottom plate connector. At this time, the originally locked cart handle 13 loses its fixing point, creating conditions for subsequent folding operations. In order to complete the complete folding of the cart handle 13, the present invention also designs a hexagonal bolt structure connected to the cart handle 13. After the spring pin 115 is disengaged, the automation equipment will take over the subsequent operation and drive the handle to rotate around its axis by rotating the hexagonal bolt 116 until it reaches the predetermined folding position. This process realizes the automation and precise control of the handle folding, greatly improving the work efficiency and convenience. The opening process of the present invention is opposite to the folding process. When the folded cart handle needs to be reopened, It is only necessary to reverse the above steps. First, the hexagonal bolt 116 is rotated in the opposite direction by the automated equipment to return the handle to its initial position. Then, the spring pin 115 is reinserted into the pin hole 112 of the base plate connector by the natural elastic force to achieve a secure locking of the handle. The pin hole 112 is designed by combining chamfering and reaming a trumpet mouth. The inner side of the pin hole 112 is finely chamfered to reduce the resistance and friction during the insertion of the striker and to protect the striker and the pin 117 from damage. At the same time, the outer side is designed to be in the shape of a reaming trumpet mouth. This design not only facilitates the rapid and accurate positioning and insertion of the striker of the automated equipment, but also guides the movement trajectory of the striker to a certain extent, ensuring that each operation can be successfully completed. The spring pin 115 is pushed out from the chassis and the handle fixing seat 111, effectively unlocking the limit, laying a solid foundation for the subsequent folding operation. In the design of the rotating bolt, the hexagonal bolt 116 is selected as the core component, and a hexagonal sleeve is matched on its outside. The advantage of this design combination is that the hexagonal sleeve can fit tightly on the six sides of the hexagonal bolt 116 to form a stable connection interface. In the process of rotating the handle, the tight fit between the hexagonal sleeve and the hexagonal bolt 116 can effectively prevent relative sliding between the two structural parts. The rotating sleeve rod 127 can adjust the handle angle. When no adjustment is required, the plug block 126 is limited inside the socket 128. When adjustment is required, the electric push rod 125 starts The plug block 126 is retracted to release the limit of the rotating sleeve rod 127. The rotating sleeve rod 127 can be rotated and adjusted at will. When it is rotated to 90°, the rotating limit block 123 is rotated to lock the rotating sleeve rod 127 to prevent the rotating sleeve rod 127 from rotating during movement. The length of the handle can be adjusted according to the height of the staff. Three round holes 129 are opened on the rotating sleeve rod 127, corresponding to different heights. Move the telescopic rod 1210 to the desired height, and the pressure of the compressed spring 1212 inside the rotating sleeve rod 127 disappears, driving the limit sleeve 1213 to clamp the corresponding round hole 129. The top of the limit sleeve 1213 is round. When changing and adjusting, compress the two ends inward, and the telescopic rod 1210 can be slid to readjust the height.

[0014] For the second embodiment, please refer to Figure 1-Figure 12 The present invention provides a wheeled stacking cart with a foldable handle: the wheel fixing device 3 includes a support leg frame 1 31 and a support leg frame 2 33, the bottom of the support leg frame 1 31 is fixedly connected with a directional wheel 32, the bottom of the support leg frame 2 33 is fixedly connected with a universal wheel 34, one side of the support leg frame 2 33 is fixedly connected with a folding fixing plate 35, the bottom of the folding fixing plate 35 penetrates and is threadedly connected with a cart limiting pin 36, the top of the support leg frame 1 31 is fixedly connected with the bottom of the cart bracket 2, and the top of the support leg frame 2 33 is fixedly connected with the bottom of the cart bracket 2; The limiting stacking device 4 includes a cart bottom plate 41, a stacking limiting block 42 is fixedly connected to the top of the cart bottom plate 41, and friction plates 1 43 are fixedly connected to both sides of the stacking limiting block 42. The side of the friction plate 1 43 away from the stacking limiting block 42 is fixedly connected to an arc-shaped spring piece 1 44, and the outer side of the arc-shaped spring piece 1 44 is fixedly connected to a friction plate 2 45, and 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, and the inner side of the arc-shaped spring piece 1 44 is fixedly connected to a rubber strip 47. A rectangular hole 48 is opened on the top of the cart bottom plate 41, and the bottom of the cart bottom plate 41 is fixedly connected to the top of the cart bracket 2, and 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 the inner side of the arc-shaped spring piece 2 The side is fixedly connected to one side of the rubber strip 47. When in use, the wheel recessed groove on one side of the directional wheel 32 is accurately calculated and processed to ensure that its shape and size perfectly match the wheel of the cart. When the carts are stacked, the wheels of the upper cart will naturally fall into the corresponding grooves on the bottom plate of the lower cart to form a stable support and positioning. This design effectively limits the front and rear left and right rotation of the wheels in the stacked state, avoiding the unstable stacking shape caused by wheel misalignment. The wheel recessed groove on one side of the universal wheel 34 also has a certain depth and width to better accommodate and fix the wheel. This design not only increases the contact area between the wheel and the groove, enhances the stability of the stack, but also can reduce the impact caused by gravity when the carts are stacked to a certain extent, protecting In order to protect the wheels and the card slot from damage, the present invention introduces an innovative nested structure of the cart limit pin 36 and the universal wheel limit hole 7 in the cart design. This design not only enhances the connection strength when the carts are stacked, but also ensures the accuracy and stability of the stacking shape. A cart limit pin 36 is respectively arranged on the inner side of the two rear wheels of the cart. The cart limit pin 36 is designed with a conical top to facilitate insertion and fixation in a preset position. At the same time, a corresponding universal wheel limit hole 7 is arranged at the corresponding position of the cart 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 nested structure after insertion to prevent the pin from falling out under vibration or external force. When the carts are stacked, the fixing pin of the upper cart will naturally fall into the lower cart. In the corresponding sleeve on the bottom plate of the layer trolley, due to the close fit between the trolley limit pin 36 and the universal wheel limit hole 7 and the special design of the cone and the bell mouth, the two can quickly form a stable hard link. This hard link can not only effectively resist external forces from all directions, but also further strengthen the connection through the gravity of the trolley itself, ensuring the accuracy and stability of the stack shape during transportation. In addition, the nested structure also has a certain fault tolerance. Even if there is a slight deviation or misalignment during the stacking process, the special design between the two can also self-adjust and adapt to a certain extent, thereby ensuring that the stability of the connection is not affected. A stacking limit block 42 is provided on the bottom plate 41 of the trolley. When stacking items on the pallet, each stack position has sufficient spacing.Both sides of the stacking limit block 42 are fixedly connected with friction plates 1 43, and friction plates 2 45 are connected to friction plates 1 43 through arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46. The surface of friction plates 2 45 is provided with corrugated lines to increase the friction between the stacked items and prevent the items from shifting. When the stacked items are squeezed, arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46 are deformed, so that the pressure can be dispersed along the arc surface, so that the elastic sheet can buffer and absorb the pressure more evenly and effectively. A rubber strip 47 is fixedly connected between arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46 to prevent the arc-shaped spring pieces from breaking due to excessive deformation.

[0015] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

[0016] When the present invention is operated and used, during normal stacking, the staff can adjust the height and angle of the handle through the handle adjustment device 1 according to their own height and other conditions. The limit stacking device 4 prevents the stacked items from shifting. When the carts need to be stacked, the handle adjustment device 1 is adjusted to stack the handles, and the wheel fixing device 3 fixes the carts to prevent tipping. When the cart handle 13 is in a normal reset (i.e., open) state, the spring pin 115 will automatically insert into the pin hole 112 preset in the bottom plate connector to form a firm mechanical lock, ensuring that the handle can be stably maintained in the open position, which is convenient for 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 cart handle 13 needs to be dropped and folded to save space or facilitate transportation, the present invention realizes this process by introducing an automatic folding mechanism. 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 connection between the handle and the base plate, and use mechanical force to compress it and make it disengage from the pin hole 112 of the base plate connecting piece. At this time, the originally locked cart handle 13 loses its fixing point, creating conditions for subsequent folding operations. In order to complete the complete folding of the cart handle 13, the present invention also designs a hexagonal bolt structure connected to the cart handle 13. After the spring pin 115 is disengaged, the automation equipment will take over the subsequent operation. By rotating the hexagonal bolt 115, the automatic equipment will take over the subsequent operation. 6 is used to drive the handle to rotate around its axis until it reaches a predetermined folding position. This process realizes the automation and precise control of the handle folding, greatly improving the work efficiency and convenience. The opening process of the present invention is opposite to the folding process. When the folded cart handle needs to be reopened, it is only necessary to reverse the above steps. First, the hexagonal bolt 116 is reversely rotated by the automated equipment to return the handle to the initial position, and then the spring pin 115 is reinserted into the pin hole 112 of the bottom plate connector by the natural elastic force to achieve a stable locking of the handle. The pin hole 112 is designed by combining chamfering and expanding the flared mouth. The inner side of the pin hole 112 is finely chamfered to reduce the impact of the striker when it is inserted. Resistance and friction protect the firing pin and pin 117 from damage. At the same time, the outer side is designed to be in the shape of an expanded trumpet mouth. This design not only facilitates the rapid and accurate positioning and insertion of the firing pin of the automated equipment, but also guides the movement trajectory of the firing pin to a certain extent, ensuring that each operation can smoothly eject the spring pin 115 from the chassis and the handle fixing seat 111, effectively unlocking the limit and laying a solid foundation for subsequent folding operations. In the design of the rotating bolt, a hexagonal bolt 116 is selected as the core component, and an inner hexagonal sleeve is provided on its outer side. The advantage of this design combination is that the inner hexagonal sleeve can fit tightly against the six sides of the hexagonal bolt 116 to form a stable connection interface. In the process of rotating the handle,This tight fit between the hexagon socket and the hexagon bolt 116 can effectively prevent relative sliding between the two structural parts. The rotating sleeve rod 127 can adjust the handle angle. When no adjustment is needed, the plug block 126 is limited inside the socket 128. When adjustment is required, the electric push rod 125 is started to retract the plug block 126 to release the limit on the rotating sleeve rod 127. The rotating sleeve rod 127 can be rotated and adjusted at will. When rotated to 90°, the rotating limit block 123 is rotated to lock the rotating sleeve rod 127 to prevent the rotating sleeve rod 127 from rotating during movement. The length of the handle can be adjusted according to the height of the staff. Three round holes 129 are opened on the rotating sleeve rod 127, corresponding to different heights, and the telescopic rod 1210 is moved to the desired height The spring 1212 compressed inside the rotating sleeve rod 127 disappears, driving the limiting sleeve 1213 to clamp the corresponding circular hole 129. The top of the limiting sleeve 1213 is rounded. When replacing and adjusting, compress both ends inward, and slide the telescopic rod 1210 to readjust the height. The wheel recessed groove on one side of the directional wheel 32 has been accurately calculated and processed to ensure that its shape and size perfectly match the wheel of the cart. When the carts are stacked, the wheels of the upper cart will naturally fall into the corresponding grooves on the bottom plate of the lower cart to form 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 unstable stacking caused by wheel misalignment. The wheel recessed groove on one side of the universal wheel 34 also has a certain depth and The width is designed to better accommodate and fix the wheels. This design not only increases the contact area between the wheels and the slots and enhances the stability of the stacking, but also can reduce the impact caused by gravity when the carts are stacked to a certain extent, protecting the wheels and the slots from damage. The present invention introduces an innovative nested structure of the cart limit pin 36 and the universal wheel limit hole 7 in the cart design. This design not only enhances the connection strength when the carts are stacked, but also ensures the accuracy and stability of the stacking shape. A cart limit pin 36 is provided on the inner side of each of the two rear wheels of the cart. The cart limit pin 36 is designed to have a conical top to facilitate insertion and fixation in a preset position. At the same time, a corresponding universal wheel limit hole 7 is provided at the corresponding position of the cart bottom plate, and the top of the sleeve is designed to be The trumpet-shaped 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 vibration or external force. When the carts are stacked, the fixing pins of the upper cart will naturally fall into the corresponding sleeves on the bottom plate of the lower cart. Due to the close fit between the cart limit pin 36 and the universal wheel limit hole 7 and the special design of the cone and the trumpet, the two can quickly form a stable hard link. This hard link can not only effectively resist external forces from all directions, but also further strengthen the connection through the gravity of the cart 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 the stacking process,The special design between the two can also self-adjust and adapt to a certain extent, so as to ensure that the stability of the connection is not affected. A stacking limit block 42 is provided on the cart bottom plate 41, which is used for stacking items on the pallet. Each stacking position has sufficient spacing. Friction plates 1 43 are fixedly connected on both sides of the stacking limit block 42. Friction plates 2 45 are connected to friction plates 1 43 through arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46. The surface of friction plate 2 45 is provided with corrugated lines to increase the friction between the stacked items and prevent the items from shifting. When the stacked items are squeezed, arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46 are deformed, so that the pressure can be dispersed along the arc surface, so that the elastic sheet can buffer and absorb the pressure more evenly and effectively. A rubber strip 47 is fixedly connected between arc-shaped spring pieces 1 44 and arc-shaped spring pieces 2 46 to prevent the arc-shaped spring pieces from excessive deformation and breakage.

[0017] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field 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).

2. A wheeled stacking cart with foldable handles according to claim 1, characterized in that: The handle adjustment device (1) comprises a folding mechanism (11), the top of the folding mechanism (11) is fixedly connected to a telescopic mechanism (12), the top of the telescopic mechanism (12) is fixedly connected to a trolley handle (13), and the bottom of the folding mechanism (11) is fixedly connected to the top of a trolley bracket (2).

3. A wheeled stacking cart with foldable handles according to claim 2, characterized in that: The folding mechanism (11) comprises a handle fixing seat (111), a pin hole (112) is formed on one side of the handle fixing seat (111), a handle rotating shaft (113) is sleeved and rotatably connected to the side of the handle fixing seat (111) close to the pin hole (112), a rotating fixing block (114) is sleeved and rotatably connected to the handle rotating shaft (113), a spring pin (115) is passed through and threadedly connected to one side of the rotating fixing block (114), a hexagonal bolt (116) is sleeved and threadedly connected to the spring pin (115), a pin (117) is sleeved and threadedly connected to one side of the rotating fixing block (114), and the bottom of the handle fixing seat (111) is fixedly connected to the top of the cart bracket (2).

4. A wheeled stacking cart with foldable handles according to claim 2, characterized in that: The telescopic mechanism (12) comprises a round rod (121), a rectangular groove (122) is provided at the top of the round rod (121), positions on both sides of the top of the round rod (121) of 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), an insert block (126) is fixedly connected to the movable end of the electric push rod (125), and the inner wall of the rectangular groove (122) is rotatably connected to a rotation sleeve rod (126) via a rotation bolt. 127), a plug hole (128) is provided on a side of the rotating sleeve rod (127) close to the rotating limit block (123), a round hole (129) is provided on a 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 round groove (1211) is provided on a side of the telescopic rod (1210) close to the round hole (129), a spring (1212) is fixedly connected to the inner wall of the round groove (1211), and one end of the spring (1212) away from the round groove (1211) is fixedly connected to the limiting sleeve (1213).

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

6. A wheeled stacking cart with foldable handles according to claim 1, characterized in that: The wheel fixing device (3) comprises a first support leg frame (31) and a second support leg frame (33), the bottom of the first support leg frame (31) being fixedly connected to a fixed wheel (32), the bottom of the second support leg frame (33) being fixedly connected to a universal wheel (34), one side of the second support leg frame (33) being fixedly connected to a folding fixing plate (35), the bottom of the folding fixing plate (35) being penetrated by and threadedly connected to a cart limit pin (36).

7. A wheeled stacking cart with foldable handles according to claim 6, 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).

8. 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 position-limiting block (42), both sides of the stacking position-limiting block (42) are fixedly connected to friction plates 1 (43), the side of the friction plate 1 (43) away from the stacking position-limiting 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).

9. A wheeled stacking cart with foldable handles according to claim 8, 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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