Multifunctional lifting trolley

Abstract

A multifunctional lifting trolley comprises a trolley underframe, a stand column arranged on the trolley underframe, an electric lifter arranged on the upper middle portion of the stand column, a lifting seat sliding in a sliding groove of the stand column and driven by the electric lifter, and a fork arm detachably installed on the lifting seat. The fork arm is provided with a clamped unit; the interior of the lifting seat is hollow, a positioning slot for limiting the final mounting position of the fork arm on the lifting seat is formed in one side wall, close to the fork arm, of the lifting seat, and the lifting seat and the fork arm are assembled through clamping combination of a clamping unit and a clamped unit which are arranged in a hollow area of the lifting seat while the position is limited; the clamping unit can retract after being extruded, does not hinder entering of the clamped unit through movement when the clamped unit enters the hollow area of the lifting base, and is combined with the clamped unit in a clamped mode through rebounding when the clamped unit reaches the final assembly position. The quick mounting and dismounting device has the beneficial effect that quick mounting and quick dismounting are realized through the clamping unit and the clamped unit.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical equipment technology, and in particular to a multifunctional lifting trolley. Background Technology

[0002] A lifting trolley is a material handling device capable of vertical lifting and horizontal movement of materials. It is widely used in material conveying processes within workshops in industries such as pharmaceuticals, chemicals, and food. In pharmaceutical production, it is often necessary to transfer raw material barrels, cylinders, pallets, or finished product containers between different workstations and at different heights. Due to its flexibility and lifting capabilities, the lifting trolley has become a common piece of equipment in such scenarios.

[0003] Existing lifting trolleys typically include a chassis with casters, uprights fixed to the chassis, a lifting mechanism mounted on the uprights, and forks for carrying materials. In practical applications, to accommodate material containers of different shapes and sizes (such as conical cylinders, drums, pallets, and bagged materials), the forks often need to be designed to be replaceable, such as fork-type, clamp-type, bracket-type, or hook-type.

[0004] Currently, the detachable connection between the fork arm and the lifting seat mostly uses bolt fastening. Specifically, corresponding mounting holes are set on the mounting end of the fork arm and the mating surface of the lifting seat, and the two are fixed by inserting bolts and tightening nuts. Although this connection method is simple in structure and low in cost, it still has the following obvious drawbacks in actual use: The replacement process is inefficient and cumbersome: Each time a forklift is replaced, the operator must align the forklift with the mounting surface of the lifting seat, ensuring that all bolt holes are aligned, and then insert and tighten each bolt one by one. After replacement, if a different type of forklift is needed, all bolts must be removed. The entire process is time-consuming, especially in situations with frequent replacements, severely impacting material flow efficiency and increasing the workload of operators.

[0005] High dependence on operating space and tools: Bolted connections usually require the use of tools such as wrenches, which is inconvenient to operate in confined spaces or at heights. If the bolt holes are worn or deformed due to manufacturing errors or long-term use, alignment and assembly will be even more difficult.

[0006] Maintenance is inconvenient: Bolts are prone to rust in humid and corrosive environments, and are difficult to disassemble and assemble; replacement after thread damage is complicated and requires machine shutdown, affecting the continuous operation capability of the equipment. Summary of the Invention

[0007] The present invention aims to overcome the shortcomings of the prior art by providing a multifunctional lifting trolley.

[0008] The technical solution adopted by the present invention to solve its technical problem is as follows: This multi-functional lifting trolley includes a chassis with several omnidirectional wheels, a column set on the chassis, an electric lifter set at the upper part of the column, a lifting seat that slides in the groove of the column and is driven by the electric lifter, and a fork arm that can be detachably installed on the lifting seat. The fork arm has a clamping unit; The lifting seat is hollow inside and has a positioning slot on one side wall near the fork arm to define the final installation position of the fork arm on the lifting seat. At the same time as defining the position, the lifting seat and the fork arm are assembled by engaging with the clamping unit set in the hollow area of ​​the lifting seat. The clamping unit can retract when squeezed, and when the clamping unit enters the hollow area of ​​the lifting seat, it can move without obstructing the entry of the clamping unit. When the clamping unit reaches the final assembly position, it engages with the clamping unit by springing back.

[0009] Further improvements are made to the T-shaped configuration of the mounting unit, which has a vertical section and a horizontal section. The positioning slot has an upper opening on the lifting seat. The vertical section, which can slide along the positioning slot and realize the assembly of the fork arm and the lifting seat, is inserted into the upper opening. The horizontal section also enters the hollow area of ​​the lifting seat at the same time as the vertical section is inserted into the positioning slot, and then engages with the mounting unit after entering.

[0010] Further improvements include a mounting unit comprising a housing, several fixed positioning blocks, several movable positioning blocks, an adjusting component, and an elastic component. The fixed positioning blocks are located on one long side and one short side of the housing, respectively, while the movable positioning blocks are located on the other long side and the other short side of the housing, respectively. The adjusting component is partially located inside the housing and partially extends outside the housing to connect with the movable positioning blocks. When the mounted unit is engaged with the mounting unit, it drives the movable positioning blocks to move adaptively. One end of the elastic component is supported on the side wall of the hollow area of ​​the lifting seat, and the other end is supported on the back of the housing away from the mounted unit. When the mounting unit is squeezed by the mounted unit, it retracts and deforms to adapt to the movement of the mounting unit. Through elastic reset, the mounting unit moves while the mounted unit resets, allowing the mounted unit to automatically insert itself into the locking area formed by the fixed positioning blocks and the movable positioning blocks.

[0011] Further improvements include a linkage part and a number of reset parts equal to the number of movable positioning blocks. Part of the linkage part is placed inside the housing and part extends outside the housing to connect with several movable positioning blocks. The reset parts are used to connect with the movable positioning blocks and the linkage part at the same time and are located on the corresponding long side and short side of the housing. They can retract when squeezed so that when the clamped unit is placed into the locking area formed by the fixed positioning block and the movable positioning block, the movable positioning block resets after adaptive movement.

[0012] Further improvements include a linkage unit comprising a control lever, a first connecting rod, a second connecting rod, a third connecting rod, a synchronizing rod, and a linkage rod that can move within the housing. The control lever is located at the center of the long side of the housing where the movable positioning block is located. The first and second connecting rods are located on either side of the control lever, and the third connecting rod is perpendicular to the control lever. The three connecting rods are connected to their respective reset parts. The synchronizing rod is connected to the control lever, the first connecting rod, and the second connecting rod simultaneously, and the linkage rod is connected to the control lever and the third connecting rod simultaneously.

[0013] Further improvements include an L-shaped linkage with its angled end connected to a rotating shaft inside the housing, so that when the control lever moves inward, it drives the third connecting rod to move inward synchronously.

[0014] Further improvements include a reset part comprising a U-shaped block, a connecting block, and a spring. The U-shaped block is mounted on the outer casing and allows a portion of the first connecting rod, a portion of the second connecting rod, and a portion of the third connecting rod to pass through after extending out of the outer casing. The connecting block and the spring are both fitted onto the portions of the first connecting rod, the second connecting rod, and the third connecting rod that extend outside the outer casing. The connecting block is used to connect the movable positioning block, and one end of the spring is supported on the U-shaped block, while the other end is supported on the connecting block.

[0015] The lifting seat has a mounting groove on the side near the reset part that allows a U-shaped block to be placed inside. One end of the operating lever passes through the housing and extends out of the mounting groove. The lifting seat has a rod mounting seat with a positioning rod on the outer side near the mounting groove. The rod mounting seat has a handle with a guide groove. The handle matches the movement of the locking unit by relying on its guide groove and the positioning rod of the rod mounting seat. The other end of the handle is inserted into the operating lever. The operating end of the handle has a locking hole. The lifting seat has a locking rod that is threaded into the locking hole near the locking hole. After the locking rod and the locking hole are locked together, the locking unit is prevented from separating from the locked unit.

[0016] The elastic element is set as a sheet-like component, which is bent into three parts. The first part is connected to the inner wall of the hollow area of ​​the lifting seat, the third part is connected to the outer shell, and the second part is used to connect the first part and the third part, and to achieve bending deformation between the first part and the third part when the clamping unit moves.

[0017] The fork arm includes a bracket, a telescopic frame mounted on the bracket and capable of extension and retraction, and a screw and nut structure. The mounting unit is located on the back of the bracket. The non-telescopic part of the telescopic frame is fixedly mounted on the arm part of the bracket, and the telescopic part is used to connect to the storage container. The screw and nut structure is axially connected to both the bracket and the non-telescopic part of the telescopic frame, and its end abuts against the telescopic part of the telescopic frame.

[0018] The beneficial effects of this invention are: 1. The present invention uses a locking unit and a locked unit to cooperate in the installation process of the fork arm. The installation process only requires aligning the fork arm with the positioning slot and pushing it to the bottom. It will automatically lock under the synergistic action of the spring and the movable positioning block. When disassembling, it can be easily removed by simply unlocking the handle. The whole process can be completed in tens of seconds, which significantly reduces the replacement operation time and labor intensity. 2. This invention achieves rigid limiting and guidance of the fork arm through the positioning slot, combined with the elastic clamping function of the clamping unit, so that the fork arm remains stable when bearing the weight of the material and the moving load, effectively preventing shaking and falling off. Moreover, the movable positioning block can adapt to the actual size of the clamped unit under the action of the spring in the reset part, realizing surface contact locking instead of point contact, which greatly improves the contact stiffness and load uniformity, and is especially suitable for high frequency and heavy load conditions. 3. The present invention uses a spatial linkage mechanism composed of a synchronizing rod and a linkage rod to ensure that multiple movable positioning blocks move synchronously, avoiding unilateral jamming or uneven loading, and improving the overall stability of the system; 4. This invention achieves mechanical locking after the handle, locking rod and locking hole are engaged, preventing the fork arm from accidentally disengaging due to vibration or accidental contact, thus ensuring operational safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 3 For the present invention Figure 2 A magnified view of part A in the middle, used to show the jammed unit and the explosion state of the jammed unit; Figure 4 This is a schematic diagram of the card-mounting unit of the present invention; Figure 5 This is a partial structural diagram of the side of the present invention; Figure 6 For the present invention Figure 5 A magnified view of part B in the diagram. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings: Referring to the attached diagram: This multi-functional lifting trolley includes a chassis 1, a column 2, an electric lifter 3, a lifting seat 4, and a fork arm 5.

[0021] The base frame 1 is equipped with several casters at its bottom, allowing the entire trolley to move flexibly within the production workshop. The upright column 2 is vertically fixed to the base frame 1, and its side facing the operator usually has a vertical groove. The electric lifter 3 is a motor equipped with a take-up reel, on which a high-strength polyester safety belt is wound, and it is installed in the upper middle part of the upright column 2. The lifting seat 4 is placed in the groove, and both ends of it have pulleys that roll on the end face of the upright column 2. It is connected to the high-strength polyester safety belt, so as to achieve stable lifting and lowering movement along the upright column 2 under the drive of the electric lifter 3. The material container to be transported is carried by the fork arm 5. The fork arm 5 is detachably installed on the lifting seat 4. The fork arm 5 has different front end shapes according to its function, such as fork rod, clamp, bracket, hook, etc. The fork rod is used to match the conical material cylinder, the clamp is used to match the round material cylinder, the bracket is used to match the pallet, and the hook is used to match the packaging bag.

[0022] The detachable connection between the fork arm 5 and the lifting seat 4 is achieved through a latching unit 6 mounted on the fork arm 5 and a latching unit 7 located inside the lifting seat 4. The lifting seat 4 has a hollow cavity structure. On its side wall facing the fork arm 5 for installation, a positioning slot 41 is provided. The positioning slot 41 has two main functions: first, to pre-position and guide the fork arm 5 during installation, ensuring that the fork arm 5 approaches the lifting seat 4 in the correct posture and position; second, when the latching unit 6 is inserted into place, the slot wall (especially the bottom or side wall) constitutes a rigid limit on the latching unit 6, accurately defining the final installation position of the fork arm 5 on the lifting seat 4, and can withstand the vertical and lateral loads generated by the material and the weight of the fork arm itself, ensuring the rigidity and stability of the connection.

[0023] The locking unit 7, located within the hollow cavity of the lifting seat 4, is used to engage with the locked unit 6. After engagement, it prevents the fork arm 5 (i.e., the locked unit 6) from separating from the lifting seat 4 in a direction opposite to the assembly direction. Moreover, as the locked unit 6 is inserted deeper, the locking unit 7 is squeezed by it, and after being squeezed, it moves away from the locked unit 6, thus allowing the locked unit 6 to continue moving downward and making way. The whole process is smooth and unobstructed. When the locked unit 6 is fully inserted into the positioning slot 41, its bottom surface contacts the bottom surface of the positioning slot 41, which is determined to be the final assembly position. At this time, the locked unit 6 moves to the position directly opposite the locking unit 7. As the squeezing force disappears, the locking unit 7 automatically springs back to its original position, and during the resetting process, the locked unit 6 and the locking unit 7 are engaged. Thus, the lifting seat 4 and the fork arm 5 are firmly assembled together, and the fork arm 5 cannot easily detach under the dual action of limiting and locking. This installation method achieves "alignment-push-clamping". Disassembly only requires pulling the clamping unit 7 in the reverse direction to separate it from the clamped unit 6, so that the replacement of the fork arm 5 can usually be completed within tens of seconds without any tools, which greatly saves time and reduces the labor intensity of operators.

[0024] The mounting unit 6 mounted on the fork arm 5 adopts a T-shaped configuration, which is integrally formed by a vertical section 61 and a horizontal section 62. The vertical section 61 is roughly elongated, while the horizontal section 62 extends from both sides of the front of the vertical section 61, forming a "T" shape. The width of the upper opening 411 matches the thickness of the vertical section 61 of the T-shaped mounting unit 6, allowing the vertical section 61 to be vertically inserted from here. After the vertical section 61 enters the opening 411, under the action of gravity or slight downward pressure, the fork arm 5 together with its mounting unit 6 moves along the groove of the positioning slot 41. As the fork arm slides down, the side wall of the positioning slot 41 provides good guidance for the vertical section 61, ensuring that the fork arm 5 approaches the final position with a precise trajectory. At the same time, the horizontal section 62 connected to the vertical section 61 also enters the hollow area inside the lifting seat 4 through the upper opening 411. When the vertical section 61 slides down to the point where its bottom surface contacts the bottom surface of the positioning slot 41, it reaches the final assembly position. At this time, the horizontal section 62 of the clamped unit 6 moves to the position directly opposite the clamped unit 7, which facilitates the subsequent clamping and engagement of the clamped unit 6 and the clamped unit 7.

[0025] The mounting unit 7 is an integrated module, mainly comprising a housing 71, a fixed positioning block 72, a movable positioning block 73, an adjusting component 74, and an elastic component 75.

[0026] Casing 71: A rigid frame that forms the main body of the module and is used to house and install all other components.

[0027] Fixed positioning block 72: There are three positioning blocks, which are pre-inserted into the housing 71 and then fixed to two adjacent side walls inside the housing 71 by bolts. For example, two blocks are located on the left long side of the housing 71 and the other block is located on the upper short side. Together they form an L-shaped reference positioning angle, which is used to precisely limit the transverse segment 62 of the clamped unit 6 from two directions (such as the left and the top).

[0028] Movable positioning blocks 73: Corresponding to fixed positioning blocks 72, there are also three or more blocks. They are arranged on the side wall opposite to the fixed positioning blocks 72, that is, on the right long side and the lower short side of the outer shell 71. These movable positioning blocks 73 are not fixed, but can move slightly along the direction perpendicular to their side wall (i.e., horizontal or vertical direction).

[0029] Adjustment component 74: Its main body is located inside the housing 71, and part of the operating end extends to the outside of the housing 71. The adjustment component 74 is connected to all the movable positioning blocks 73. By operating the exposed adjustment end, all the movable positioning blocks 73 can be precisely and synchronously driven to retract towards the center or expand outward, so that the movable positioning blocks 73 have an adaptive movement function. Thus, when the transverse section 62 is squeezed in, the size of the "clamping area" jointly formed by the fixed positioning block 72 and the movable positioning block 73 can be changed to obtain a clamping area that always matches the current part size best. Furthermore, the surface contact also greatly improves the contact stiffness and load-bearing capacity during clamping, effectively suppressing fretting and stress concentration under load. It is particularly suitable for harsh working conditions with high frequency and heavy load, and the connection stability reaches a near-integral level.

[0030] Elastic element 75: When the entire mounting unit 7 module is subjected to a thrust, it can be compressed and retracted as a whole in the direction away from the mounted unit 6, and automatically elastically reset after the thrust disappears. The reset function can automatically tighten the connection and eliminate gaps. The entire installation process changes from "hard collision" to "soft landing" and then "automatic tightening", with a smooth feel.

[0031] The adjusting component 74 consists of a linkage part 741 and a number of reset parts 742 equal to the number of movable positioning blocks 73. The linkage part 741 serves as the main drive and synchronization mechanism, connected to all movable positioning blocks 73, and synchronously and precisely controls the initial opening amplitude or final locking position of all movable positioning blocks 73, realizing macroscopic size adjustment and locking release. The reset parts 742 serve as adaptive fine-tuning and automatic reset mechanisms, with a number corresponding to the number of movable positioning blocks 73, and are connected to both the movable positioning blocks 73 and the linkage part 741. This allows the movable positioning blocks 73 to elastically retract and store energy when compressed, and drive the movable positioning blocks 73 to elastically reset when the compression force disappears, providing continuous and flexible clamping force. Thus, the combination of the linkage unit 741 and the reset unit 742 achieves a precise separation and synergy of functions. The linkage unit is responsible for macroscopic adjustment and synchronization, while the reset unit is responsible for microscopic adaptation and final clamping. This modular design reduces the complexity of individual components, facilitating manufacturing, debugging, and maintenance, and resulting in multi-dimensional performance improvements. The elastic final clamping provided by the reset unit 742 can actively eliminate minute gaps caused by the microscopic morphology of parts, thermal expansion and contraction, or minor deformation. This allows the connection to reach an almost "zero gap" state after locking, fundamentally eliminating wobbling and fretting wear caused by gaps. This is especially crucial for applications requiring high-precision handling or absolute static positioning. The rigidity is maximized, and each movable positioning block 73 is equipped with an independent reset part 742, forming a distributed, parallel adaptive system. Each point can independently sense and respond to local pressure, ensuring that even slightly deviated transverse segments 62 can obtain comprehensive and uniform clamping force, avoiding the risk of excessive local stress, and significantly improving the uniformity of load-bearing and structural life. At the same time, during the entire installation process, the movable positioning block 73 actively approaches the transverse segment 62 through the elastic deformation of the reset part 742, which is a true flexible contact. After each installation, the movable positioning block 73 resets under the same elastic preload, ensuring that the clamping state has a high degree of consistency and repeatability.

[0032] The linkage unit 741 consists of a control lever 7411, a first connecting rod 7412, a second connecting rod 7413, a third connecting rod 7414, a synchronizing rod 7415, and a linkage rod 7416. The control lever 7411, as the core input and power distribution hub of the entire linkage unit 741, is located in the center of the long side, facilitating user operation when releasing the engagement of the locked unit 6 and the locked unit 7. The first connecting rod 7412 and the second connecting rod 7413 are located on either side of the control lever 7411 and are substantially parallel to it. They are each connected to the reset part 742 and the corresponding movable positioning block 73 located on the same long side, directly driving the movable positioning block 73 on that side to move. The third connecting rod 7414 is arranged perpendicular to the control lever 7411, connecting to the reset part 742 and the corresponding movable positioning block 73 on the short side, driving the movement of that side. The movable positioning blocks 73 move in the direction of movement; the synchronizing rod 7415 is a key distribution rod, which is simultaneously hinged or slidably connected to the operating rod 7411, the first connecting rod 7412, and the second connecting rod 7413 at the node, transmitting the single input action of the operating rod 7411 equally and synchronously to the first and second connecting rods on the left and right sides, ensuring that the two movable positioning blocks 73 move absolutely synchronously without any time difference or displacement difference. This is crucial for ensuring the centering of the locking area and preventing the jammed unit from deviating and jamming due to unilateral force, achieving perfect mechanical symmetrical control; the linkage rod 7416 is another core rod, responsible for realizing the motion coupling between different motion directions. It is simultaneously hinged or slidably connected to the operating rod 7411 and the third connecting rod 7414 at the node, and its function is to effectively convert the movement of the operating rod 7411 into the movement of driving the third connecting rod 7414.

[0033] The entire linkage forms a stable spatial linkage mechanism, unlike flexible ropes or gear chains. It features zero backlash, high rigidity, and impact resistance. When subjected to strong elastic force from the reset part 742 or external vibration, the mechanism will not experience creep or wear-induced loss of accuracy, maintaining the initially set motion relationship for a long time with extremely high reliability. Due to the force distribution effect of the synchronizing rod 7415 and the linkage rod 7416, the force applied by the operator through the control lever 7411 is evenly distributed to overcome the elastic force of all reset parts 742. This results in a smooth operating feel and balanced force, without any particular side being excessively heavy. The linkage 7416 is specifically designed as an L-shaped rigid rod with a distinct turning angle. The two arms of this L-shaped rod are called the input arm (connected to the control lever 7411) and the output arm (connected to the third connecting rod 7414). A shaft hole is provided at the angled end of the L-shaped linkage 7416 (i.e., the vertex of the corner where the two arms intersect), which is rotatably connected to the housing 71 through a rotating shaft. This allows the entire linkage 7416 to rotate freely around the rotating shaft. When the control lever 7411 moves inward, a force is applied to the linkage 7416 through the hinge point between the control lever 7411 and the end of the input arm of the linkage 7416. Since the angled end of the linkage 7416 is fixed at the center of rotation by the rotating shaft, this force will immediately generate a rotational torque. The rotation of the linkage 7416 directly drives its output arm to swing. Since the end of the output arm is hinged to the third connecting rod 7414, the swing of the output arm is converted into a linear motion that pushes or pulls the third connecting rod 7414.

[0034] The reset part 742 consists of a U-shaped block 7421, a connecting block 7422, and a spring 7423. The U-shaped block 7421 serves as the fixed base and guide mechanism for the reset part 742. It is U-shaped with its opening facing the movable positioning block 73 and is securely fixed to the corresponding side wall of the housing 71 by screws. The transverse section of the U-shaped block has a precise guide hole, allowing the end portion of the corresponding connecting rod (such as the first connecting rod 7412) to smoothly extend beyond the housing 71 through this hole. The U-shaped block provides a stable one-end support for the spring and guides and prevents swaying of the connecting rod. The connecting block 7422 serves as the power output and motion conversion interface for the reset part 742. It is a sliding... A block-shaped component is fitted onto the connecting rod portion extending out of the outer casing 71 and is interference-fitted with the connecting rod. The connecting block 7422 and the corresponding movable positioning block 73 are assembled together by bolts. Therefore, the movement of the connecting block 7422 will be directly converted into the linear movement of the movable positioning block 73. The spring 7423, as the core power element and buffer medium of the reset part 742, is a cylindrical helical compression spring. It is also fitted onto the connecting rod and located between the U-shaped block 7421 and the connecting block 7422. One end of the spring 7423 (usually the end closer to the outer casing 71) is supported on the end face of the transverse section of the U-shaped block 7421, and the other end is supported on the end face of the connecting block 7422 facing the U-shaped block. The U-shaped block 7421 integrates three functions: fixing, guiding, and spring seat. The connecting block 7422 integrates sliding, connecting, and spring seat functions. All components are arranged along the connecting rod, resulting in an extremely compact structure that maximizes space utilization. The connecting rod passes through the guide hole of the U-shaped block, ensuring that the movement of the movable positioning block 73 is always a precise axial linear movement without the risk of lateral offset or jamming. The cylindrical helical compression spring has excellent linear force-displacement characteristics, which means that the moving resistance of the movable positioning block 73 is proportional to the moving distance, making the adaptive process smooth and providing clear feedback. At the same time, by selecting springs 7423 with different stiffness and pre-compression lengths, the initial preload and working stiffness of the entire reset part 742 can be easily adjusted, thereby optimizing the locking force and operating feel to adapt to the requirements of different load levels or usage frequencies, providing flexibility and adjustability in use.

[0035] On the side wall of the lifting seat 4 near its internal locking unit 7 (specifically, the U-shaped block 7421 near the reset part 742), there is a mounting groove 42 communicating with the internal hollow area. The width of the mounting groove 42 is designed to be larger than the width of the U-shaped block 7421 of the locking unit 7. This facilitates the quick installation and positioning of the entire locking unit 7 module and does not obstruct movement when the locking unit 7 moves. On the outer side of the lifting seat 4, a rod mounting seat 43 is fixedly provided in the area corresponding to the mounting groove 42. The rod mounting seat 43 is provided with a horizontal positioning rod. The handle 431 moves through its guide groove and the positioning rod, allowing the handle 431 to move. One end of the handle 431 is provided with an insertion channel. The end part of the movement stroke of the operating lever 7411 passes through the mounting groove 42 and inserts into the insertion channel of the handle 431, forming a plug-in engagement. When changing the fork arm 5, the locking unit 7 is pulled away from the locked unit 6 by the handle, realizing the separation of the two. The depth of the insertion channel is also sufficient to meet the needs of the locked unit 6. During assembly of the locking units 6 and 7, the outward movement of the lever 7411 does not obstruct the position adjustment of the movable positioning block 73, facilitating operation from the outside. To prevent accidental unlocking during the locked state, an independent mechanical locking device is provided. Specifically, a locking hole 4311 is provided at the operating end of the handle 431, and a threaded seat with a threaded hole is installed on the outer shell of the lifting base 4, adjacent to the location of the locking hole 4311 when the handle 431 is in the locked position. A locking rod 44 is connected, which is usually a bolt with external threads. Its axis is aligned with the locking hole 4311. When the mounting unit 7 and the mounted unit 6 are in the assembly state, the locking rod 44 is locked with the locking hole 4311 (i.e., the locking rod 44 is screwed into the locking hole 4311). The movement of the locking rod 44 under the action of the screw hole is achieved by rotation. In this way, after the locking rod 44 is locked with the locking hole 4311, the handle 431 cannot continue to swing, thus not affecting the assembly state of the mounting unit 7 and the mounted unit 6.

[0036] The elastic element 75 is made from a single sheet of metal with good elasticity (such as spring steel, stainless steel, or a highly elastic alloy sheet) through precision stamping and bending. The sheet-like component stores energy through the overall, large-curvature bending deformation of the material, and the stress is relatively uniformly distributed across its cross-section. This allows it to maintain its elastic properties even after being subjected to millions or even tens of millions of cyclic loads. The flat sheet structure has extremely small dimensions in the direction perpendicular to its plane, allowing it to be installed in very narrow spaces, which is beneficial for achieving a compact design of the lifting seat 4 structure. Through the bending process, the sheet-like component forms three functionally distinct and continuous areas: Part 1 (Connecting End): This is one end of a sheet-like component, which is typically designed as a planar structure with mounting holes for fixed connection to the inner wall of the hollow area of ​​the lifting seat 4. This connection can be achieved by bolt tightening to ensure a firm and secure fit.

[0037] The third part (connecting end): is the other end of the sheet member, which is also designed with a corresponding connecting structure for fixed connection to the back of the mounting unit housing 71. This connection can be achieved by bolt tightening to ensure that it is firm and does not loosen, and directly links the movement of the housing 71 with the deformation of the sheet member.

[0038] The second part (elastic deformation section): This is the middle area connecting the first part and the third part, and it is also the core part of the entire elastic component to realize its function. It forms an elastic beam structure such as "V" shape through one or more bends at a specific angle and curvature. This part is not connected to any fixed structure and is in a free and elastically deformable state.

[0039] This design makes the sheet-like components simple in structure, without gaps or pores, and less prone to accumulating dust and oil. The overall surface can be plated or coated, and it has good corrosion resistance. As a standardized stamped part, it has low manufacturing cost and high consistency. If replacement is needed, only the fixed connections at both ends need to be disassembled, making maintenance very simple.

[0040] The fork arm 5 is a functionally integrated module, mainly comprising a bracket 51, a telescopic frame 52, and a screw and nut structure 53. The bracket 51, as the main load-bearing structure of the fork arm, is typically welded or cast from sturdy steel to form a U-shaped basic frame. A vertical steel section is welded to the center of its horizontal section for welding the clamped unit 6, enabling quick-release connection with the lifting seat 4. The telescopic frame 52 is the core for length adjustment, and it includes at least one non-telescopic part (fixed part). The telescopic part (movable part) is fixedly mounted on the two arms of the support 51. The telescopic part is slidably assembled within the non-telescopic part and can smoothly extend or retract along its length. The outer end of the telescopic part is designed with an interface for connecting or supporting storage containers. By moving the telescopic part, the effective working width between the load-bearing points of the fork arms can be changed. The screw and nut structure 53 realizes a precise, labor-saving adjustment and self-locking drive mechanism. Its screw is connected to the non-telescopic part of the telescopic frame 52 and the cross section of the support 51 through a bearing shaft, ensuring that the screw can rotate but its axial direction is limited. Its nut is welded and fixed to the cross bar of the non-telescopic part of the telescopic frame 52 and connected to the screw shaft. The threaded section of the screw passes through the aforementioned nut, and one end of it abuts against the corresponding force point of the telescopic part of the telescopic frame 52, while the other end is equipped with a handwheel to adapt to remote transportation.

[0041] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A multi-functional lifting trolley, comprising a chassis (1) with several omnidirectional wheels, a column (2) mounted on the chassis (1), an electric lifter (3) mounted at a position slightly above the middle of the column (2), a lifting seat (4) that slides in a groove of the column (2) and is driven by the electric lifter (3), and a fork arm (5) that is detachably mounted on the lifting seat (4). Its features are: The fork arm (5) has a clamping unit (6); The lifting seat (4) is hollow inside and has a positioning slot (41) on one side wall near the fork arm (5) that defines the final installation position of the fork arm (5) on the lifting seat (4). At the same time defining the position, the lifting seat (4) and the fork arm (5) are assembled by engaging with the clamped unit (6) through a clamping unit (7) set in the hollow area of ​​the lifting seat (4). The clamping unit (7) can be retracted when squeezed, and when the clamped unit (6) enters the hollow area of ​​the lifting seat (4), it can move without obstructing the entry of the clamped unit (6). When the clamped unit (6) reaches the final assembly position, it engages with the clamped unit (6) through springback.

2. The multi-functional lifting trolley according to claim 1, characterized in that: The clamping unit (6) has a T-shaped configuration, with a vertical section (61) and a horizontal section (62). The positioning slot (41) has an upper opening (411) on the lifting seat (4). The upper opening (411) is inserted into the vertical section (61), which can slide along the positioning slot (41) and realize the assembly of the fork arm (5) and the lifting seat (4). When the vertical section (61) is inserted into the positioning slot (41), the horizontal section (62) also enters the hollow area of ​​the lifting seat (4) at the same time, and after entering, it is clamped and engaged with the clamping unit (6).

3. The multi-functional lifting trolley according to claim 2, characterized in that: The mounting unit (7) includes a housing (71), a plurality of fixed positioning blocks (72), a plurality of movable positioning blocks (73), an adjusting member (74), and an elastic member (75). The fixed positioning blocks (72) are respectively located on one long side and one short side of the housing (71), and the movable positioning blocks (73) are respectively located on the other long side and the other short side of the housing (71). The adjusting member (74) is partially disposed inside the housing (71) and partially extends outside the housing (71) to connect with the plurality of movable positioning blocks (73), and is located between the mounted unit (6) and the mounting unit (7). When the clamping is engaged, the movable positioning block (73) is driven to move adaptively. One end of the elastic element (75) is supported on the side wall of the hollow area of ​​the lifting seat (4), and the other end is supported on the back of the outer shell (71) away from the back of the clamped unit (6). When the clamping unit (7) is squeezed by the clamped unit (6), it retracts and deforms to adapt to the movement of the clamping unit (7). Through elastic reset, the clamping unit (7) realizes that the clamped unit (6) is automatically placed into the clamping area formed by the fixed positioning block (72) and the movable positioning block (73) while the clamping unit (7) is reset and moved.

4. The multi-functional lifting trolley according to claim 3, characterized in that: The adjusting member (74) includes a linkage part (741) and a number of reset parts (742) equal to the number of movable positioning blocks (73). The linkage part (741) is partially placed inside the housing (71) and partially extends outside the housing (71) to be connected to a number of movable positioning blocks (73). The reset part (742) is used to connect with the movable positioning block (73) and the linkage part (741) at the same time and is located on the corresponding long side and short side of the housing (71). It can be retracted when squeezed so that when the clamped unit (6) is inserted into the clamping area formed by the fixed positioning block (72) and the movable positioning block (73), the movable positioning block (73) resets after adaptive movement.

5. The multi-functional lifting trolley according to claim 4, characterized in that: The linkage (741) includes a joystick (7411) movable within the housing (71), a first connecting rod (7412), a second connecting rod (7413), a third connecting rod (7414), a synchronizing rod (7415), and a linkage rod (7416). The joystick (7411) is located at the center of the long side of the housing (71) where the movable positioning block (73) is located. The first connecting rod (7412) and the second connecting rod (7413) are located at... The two sides of the control lever (7411) and the third connecting rod (7414) are arranged perpendicularly to the control lever (7411). The three connecting rods are connected to the corresponding reset part (742). The synchronization rod (7415) is connected to the control lever (7411), the first connecting rod (7412), and the second connecting rod (7413) at the same time. The linkage rod (7416) is connected to the control lever (7411) and the third connecting rod (7414) at the same time.

6. The multi-functional lifting trolley according to claim 5, characterized in that: The linkage rod (7416) has an L-shaped configuration, and its angled end is connected to the rotating shaft provided in the housing (71) so that when the control lever (7411) moves inward, it drives the third connecting rod (7414) to move inward synchronously.

7. The multi-functional lifting trolley according to claim 5, characterized in that: The reset part (742) includes a U-shaped block (7421), a connecting block (7422), and a spring (7423). The U-shaped block (7421) is disposed on the outer shell (71) and allows a portion of the first connecting rod (7412), a portion of the second connecting rod (7413), and a portion of the third connecting rod (7414) to pass through after extending out of the outer shell (71). The connecting block (7422) and the spring (7423) are both fitted on the portions of the first connecting rod (7412), the second connecting rod (7413), and the third connecting rod (7414) that extend outside the outer shell (71). The connecting block (7422) is used to connect the movable positioning block (73). One end of the spring (7423) is supported on the U-shaped block (7421), and the other end is supported on the connecting block (7422).

8. The multi-functional lifting trolley according to claim 5, characterized in that: The lifting seat (4) has a mounting groove (42) on the side near the reset part (742) that allows the U-shaped block (7421) to be placed inside. The operating lever (7411) extends through the mounting groove (42) through one end of the housing (71). The lifting seat (4) has a rod mounting seat (43) with a positioning rod on the outer side near the mounting groove (42). The rod mounting seat (43) has a handle (431) with a guide groove. The handle (431) relies on its guide groove and the rod mounting seat. The positioning rod of the mounting base (43) matches the movement of the clamping unit (7), and the other end of the handle (431) is inserted into the control lever (7411). The operating end of the handle (431) is provided with a locking hole (4311). The lifting base (4) is provided with a locking rod (44) that is threaded into the locking hole (4311) at a position close to the locking hole (4311). After the locking rod (44) and the locking hole (4311) are locked together, the clamping unit (7) is prevented from separating from the clamped unit (6).

9. The multi-functional lifting trolley according to claim 3, characterized in that: The elastic element (75) is configured as a sheet-like component, which is bent into three parts. The first part is connected to the inner wall of the hollow area of ​​the lifting seat (4), the third part is connected to the outer shell (71), the second part is used to connect the first part and the third part, and bends and deforms between the first part and the third part when the clamping unit (7) moves.

10. The multi-functional lifting trolley according to claim 1, characterized in that: The fork arm (5) includes a bracket (51), a telescopic frame (52) mounted on the bracket (51) and extendable, and a screw nut structure (53). The clamping unit (6) is located on the back of the bracket (51). The non-telescopic part of the telescopic frame (52) is fixedly mounted on the arm part of the bracket (51), and the telescopic part is used to connect to the storage container. The screw nut structure (53) is axially connected to both the bracket (51) and the non-telescopic part of the telescopic frame (52), and its end abuts against the telescopic part of the telescopic frame (52).

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