Heavy load four-point synchronous jacking structure

Abstract

This invention discloses a heavy-duty four-point synchronous lifting structure, relating to the field of lifting equipment technology. The lifting mechanism is installed inside a housing, and its upper part passes through the housing to connect to a lifting platform. The lifting platform is raised and lowered relative to the housing via the lifting mechanism. The main body of the drive component is mounted on the lower cover, and the drive component drives the movable end of the lifting support assembly to move vertically. The top end of the movable end of the lifting support assembly passes through the upper cover and is fixedly connected to the lifting platform. Through the configuration of the linkage seat assembly and the lifting support assembly, this invention allows the linkage seat assembly to simultaneously drive the lead screws of four lifting support assemblies, thereby enabling the lifting components on each lead screw to move synchronously up and down, ensuring uniform force distribution on the lifting platform. The structure of the first driven gear and the lifting gear arranged in a cross shape around the first driving gear ensures that the power of the first motor can be transmitted evenly and synchronously to the four lifting support assemblies, thus achieving the effect of synchronous lifting of the four lifting support assemblies.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, specifically a heavy-duty four-point synchronous lifting structure. Background Technology

[0002] In intelligent manufacturing, lifting structures are core execution components of AGVs, heavy-duty transport equipment, etc., used to lift, position and transfer goods. In the workflow of 3D sand mold printers, trolleys with lifting structures are mainly used to transport sand boxes. They are lifted and transported to the inside of the printing equipment and placed on the printing platform. After printing is completed, they are lifted again to connect the sand box and transported to the next stage.

[0003] Most existing lifting structures use ordinary screw lifting or hydraulic lifting. Ordinary screw lifting is mostly driven by a single screw or double screw, which has poor synchronization and is prone to tilting and jamming under heavy loads. It also has low stability and safety during the transportation of sand boxes. Although hydraulic lifting can achieve heavy-load lifting, it has a complex structure, heavy weight, and occupies a lot of space in the height direction, which cannot meet the needs of lightweight equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a heavy-duty four-point synchronous lifting structure to solve the problems mentioned in the background art. Most of the existing lifting structures adopt ordinary screw lifting or hydraulic lifting methods. Ordinary screw lifting is mostly driven by a single screw or double screw, which has poor synchronization. Under heavy load, the lifting platform is prone to tilting and jamming, resulting in low stability and safety during the transportation of sand boxes. Although hydraulic lifting can achieve heavy-duty lifting, it has a complex structure, large weight, and occupies a lot of space in the height direction, which cannot meet the needs of lightweight equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heavy-duty four-point synchronous lifting structure, comprising a lifting mechanism, a lifting platform, and a housing. The lifting mechanism is installed inside the housing, and the upper part of the lifting mechanism passes through the housing and is connected to the lifting platform. The lifting platform is raised and lowered relative to the housing by the lifting mechanism. The lifting mechanism includes a driving component and a lifting support assembly. The housing includes an upper cover and a lower cover. The body of the driving component is installed on the lower cover. The driving component drives the movable end of the lifting support assembly to move vertically. The top end of the movable end of the lifting support assembly passes through the upper cover and is fixedly connected to the lifting platform.

[0006] Preferably, the driving component is a first rotational driving component. The lifting support assembly includes a lead screw, a support plate, and a lifting component as the movable end. The first rotational driving component drives the bottom end of the lead screw to rotate. The top of the lead screw is rotatably connected to the upper cover. The lifting component is threadedly connected to the lead screw. The lifting component only moves in the vertical direction. The lifting component passes through the top end of the upper cover and is fixedly connected to the lifting platform through the support plate.

[0007] Preferably, the lifting component includes a nut seat, a cross plate, and a guide sleeve. The nut seat is threadedly connected to a lead screw. The cross plate is disposed on the nut seat and has a slot for the lead screw to pass through. The guide sleeve is disposed on the cross plate and passes through the upper cover. The upper cover has a lifting hole that matches the outer diameter of the guide sleeve. The support plate is fixedly connected to the upper end of the guide sleeve passing through the upper cover with a screw.

[0008] Preferably, four lifting support components are provided, and the four lifting support components are distributed in a rectangular shape inside the housing. The linkage seat assembly of the first rotation drive component simultaneously drives the lead screws of the four lifting support components.

[0009] Preferably, the linkage seat assembly includes an upper base plate, a lower base plate, a gear transmission assembly, and a first motor. The gear transmission assembly includes a first driving gear, a first driven gear, and a lifting gear. The lower base plate is fixedly connected to the lower cover. The gear transmission assembly is installed between the upper base plate and the lower base plate. The first driving gear is located at the center of the lower base plate. The body of the first motor is fixed to the upper base plate. The output end of the first motor passes through the upper base plate and is coaxially fixedly connected to the first driving gear. The combination of the first driven gear and the lifting gear is arranged in four groups in a cross shape around the first driving gear. Each group includes one lifting gear and multiple first driven gears. The multiple first driven gears in each group are linearly distributed and meshed sequentially. The first driven gear at one end meshes with the first driving gear, and the first driven gear at the other end meshes with the lifting gear. The four lifting gears are coaxially fixedly connected to four lead screws respectively.

[0010] Preferably, a limiting protection mechanism is provided on the upper plate of the base. The limiting protection mechanism includes four sets of horizontal plate height protection components. Each horizontal plate height protection component includes a horizontal plate connector. The four sets of horizontal plate connectors are respectively disposed between the axes of the four lead screws and the first driving gear. The four sets of horizontal plate connectors slide synchronously in the direction of the line connecting the axes of their respective lead screws and the first driving gear. Each horizontal plate connector includes a limiting member. A horizontal plate connecting groove is provided on the side of the limiting member near the lifting member. The lifting member includes a horizontal plate disposed in the middle. The lifting member is adjusted so that the height of the horizontal plate and the horizontal plate connecting groove are consistent, so that the horizontal plate connector slides away from the first driving gear. The protruding edge of the horizontal plate is inserted into the horizontal plate connecting groove of the limiting member.

[0011] Preferably, the limiting protection mechanism further includes a second rotation drive and a rotation connector. The second rotation drive drives the rotation connector to rotate and connect above the upper plate of the base. The four sets of the horizontal plate height protection components are arranged on the rotation connector in a cross-shaped arrangement of the combination of the first driven gear and the lifting gear. The horizontal plate height protection components further include a translation connector and a slide. The translation connector includes a first connecting rod and a second connecting rod. The slide is installed on the upper plate of the base with its track parallel to the line connecting the lead screw and the first driving gear axis. The horizontal plate connector is laterally slidably connected to the slide. One end of the first connecting rod is rotatably connected to the rotation connector, and the other end is rotatably connected to one end of the second connecting rod. The other end of the second connecting rod is fixedly connected to the horizontal plate connector.

[0012] Preferably, two limiting components are provided, namely a lower limiting component and an upper limiting component. The horizontal connecting component also includes a positioning seat. The lower limiting component and the upper limiting component are arranged vertically. The lower limiting component is fixedly connected above the positioning seat, and the upper limiting component is disposed above the lower limiting component.

[0013] Preferably, the cross-section connector further includes a guide rod and a screw. The lower end of the guide rod is fixedly connected to the lower limit member and the upper end passes through the through hole of the upper limit member. The upper surface of the lower limit member is provided with a threaded groove. The screw is threadedly connected to the lower limit member and the upper limit member. The lower end of the screw passes through the upper limit member from top to bottom and is connected to the threaded groove.

[0014] Preferably, a sand box is placed on the lifting platform, and four positioning recesses are symmetrically distributed on the part of the lifting platform that extends beyond the outer diameter of the upper cover in the horizontal direction. Positioning protrusions that match the size of the positioning recesses are installed at the corresponding positions on the bottom of the sand box.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The present invention, through the arrangement of the linkage base assembly and the lifting support assembly, enables the linkage base assembly to simultaneously drive the lead screws of the four lifting support assemblies, thereby making the lifting components on each lead screw move up and down synchronously, ensuring that the lifting platform is subjected to uniform force; the structure in which the first driven gear and the lifting gear are arranged in a cross shape around the first driving gear realizes the uniform distribution of power, ensuring that the power of the first motor can be transmitted evenly and synchronously to the four lifting support assemblies, thereby achieving the effect of synchronous lifting of the four lifting support assemblies;

[0017] 2. By setting up the lead screw and gear set, the present invention will not cause the lead screw to rotate and drive the first motor to rotate in the reverse direction when the lifting platform is under pressure. Therefore, the distribution of the gear set achieves the effect of self-locking protection for the structure. Even if the power is cut off, it is not easy to fall, forming the first line of defense for the height of the lifting platform.

[0018] 3. In this invention, the first line of defense can act throughout the entire process of lifting, maintaining the lifting height, and lowering the lifting platform during transportation. The limiting component can keep the lifting component at this height, thereby achieving the following: when the lifting platform is at the set height, the limiting component provides an additional force to keep the horizontal plate stable at this height on the basis of the first line of defense, improving the stability of the lifting platform supporting the sand box, forming a second line of defense, and improving transportation safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the heavy-duty four-point synchronous lifting structure of the present invention.

[0020] Figure 2 This is a schematic diagram showing the positional relationship between the lifting mechanism and the housing of the present invention.

[0021] Figure 3 This is an exploded view of the connection between the lifting platform and the sand box of the present invention.

[0022] Figure 4 This is a cross-sectional schematic diagram of the positioning recess of the present invention.

[0023] Figure 5 This is a schematic diagram showing the distribution relationship of the linkage seat assembly, the lifting support assembly, and the limit protection mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the lifting support component structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the lifting component structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the linkage seat assembly structure of the present invention.

[0027] Figure 9 This is a schematic diagram of the limiting protection mechanism of the present invention.

[0028] Figure 10 This is a schematic diagram of the horizontal strip height protection component structure of the present invention.

[0029] Figure 11 This is a schematic diagram of the horizontal strip connector structure of the present invention.

[0030] In the diagram: 1. Lifting mechanism; 11. Linkage seat assembly; 111. Upper base plate; 112. Lower base plate; 113. Gear transmission assembly; 1131. First driving gear; 1132. First driven gear; 1133. Lifting gear; 114. First motor; 12. Lifting support assembly; 121. Lifting component; 1211. Nut seat; 1212. Horizontal plate; 12121. Protruding edge; 1213. Guide sleeve; 122. Lead screw; 123. Support plate; 2. Lifting platform; 21. Positioning recess; 211. Frustum-shaped side; 212. Columnar side; 22. Positioning protrusion; 3. Housing; 31. Top cover; 311. Lifting mechanism 312. Hole; 32. Twisting hole; 33. Facade; 34. Lower cover; 4. Limit protection mechanism; 41. Rotating connector; 42. Angular rotation support; 43. Second driven gear; 44. Second driving gear; 45. Second motor; 46. Horizontal plate height protection assembly; 461. Translation connector; 4611. First connecting rod; 4612. Second connecting rod; 462. Horizontal plate connector; 4620. Horizontal plate connecting groove; 4621. Positioning seat; 46211. Pulley; 4622. Lower limit component; 46221. Threaded groove; 4623. Upper limit component; 4624. Guide rod; 4625. Screw; 463. Slide; 5. Sand box. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] One embodiment of the present invention provides: a heavy-duty four-point synchronous lifting structure, such as... Figure 1 and Figure 2 As shown, it includes a lifting mechanism 1, a lifting platform 2, a housing 3, and a limit protection mechanism 4.

[0033] like Figure 1 and Figure 2 As shown, the lifting mechanism 1 is installed inside the housing 3. The housing 3 includes an upper cover 31, a vertical surface 32, and a lower cover 33. The upper cover 31 and the lower cover 33 are respectively connected to the upper and lower parts of the vertical surface 32.

[0034] The lifting mechanism 1 passes through the housing 3 and is connected to the lifting platform 2. The lifting platform 2 is raised and lowered relative to the housing 3 by the lifting mechanism 1, thereby raising and lowering the sand box 5 placed on the lifting platform 2.

[0035] like Figure 3As shown, the lifting platform 2 has four symmetrically distributed positioning recesses 21 extending beyond the outer diameter of the upper cover 31 in the horizontal direction. Positioning protrusions 22, which are sized to match the positioning recesses 21, are installed at corresponding positions on the bottom of the sand box 5. The connection structure between the positioning recesses 21 and the positioning protrusions 22 helps to position the sand box 5 when it is placed on the lifting platform 2. When the positioning recesses 21 and the positioning protrusions 22 are connected, the relative positions of the sand box 5 and the lifting platform 2 remain unchanged, which can prevent the sand box 5 from shifting and improve the accuracy of the lifting platform 2 in transporting the sand box 5 into the printing equipment for positioning.

[0036] like Figure 3 and Figure 4 As shown, the positioning recess 21 includes a frustum-shaped side surface 211 and a columnar side surface 212. The frustum-shaped side surface 211 is connected to the upper surface of the lifting platform 2, and the columnar side surface 212 is connected to the lower surface of the frustum-shaped side surface 211. The lower inner diameter of the frustum-shaped side surface 211 and the inner diameter of the columnar side surface 212 are the same. Both the stages of transporting the sand box 5 into the printing equipment and transporting the sand box 5 out of the printing equipment involve the action of the sand box 5 falling onto the lifting platform 2. The structure of the frustum-shaped side surface 211 and the columnar side surface 212 of the positioning recess 21 ensures that even if the sand box 5 is slightly misaligned with the lifting platform 2, the positioning protrusion 22 can accurately fall into the corresponding columnar side surface 212 under the action of the smooth frustum-shaped side surface 211, ensuring that the sand box 5 is aligned with the center of the lifting platform 2 each time it is transported, thus improving the balance of the transportation process.

[0037] like Figure 1 , Figure 2 and Figure 5 As shown, the lifting mechanism 1 includes a driving component and a lifting support assembly 12. The body of the driving component is mounted on the lower cover 33. The driving component drives the movable end of the lifting support assembly 12 to move vertically. The top end of the movable end of the lifting support assembly 12 passes through the upper cover 31 and is fixedly connected to the lifting platform 2. When the driving component is in operation, the movable end of the lifting support assembly 12 moves vertically, causing the height of the lifting platform 2 to change.

[0038] like Figure 6As shown, the structure of the lifting support assembly 12, driven by a driving component, moves the movable end vertically. A specific method is illustrated here, where the driving component is a first rotary driving component. The lifting support assembly 12 includes a lead screw 122, a support plate 123, and a lifting component 121 as the movable end. The first rotary driving component drives the bottom end of the lead screw 122 to rotate. The top of the lead screw 122 is rotatably connected to the upper cover 31. The lifting component 121 is threaded onto the lead screw 122 and moves only in the vertical direction. The lifting component 121 passes through the top of the upper cover 31 and is fixedly connected to the lifting platform 2 via the support plate 123. When the lead screw 122 rotates, the lifting component 121, whose direction of movement is restricted, moves vertically up and down on the lead screw 122, thereby changing the height of the lifting platform 2. This process converts rotational motion into linear reciprocating motion. Compared to hydraulic lifting structures, this structure is less complex, lighter, and saves space in the height direction, meeting the requirements for lightweight design. Its low weight also extends the trolley's transport endurance.

[0039] like Figure 7 As shown, the lifting component 121 includes a nut seat 1211, a cross plate 1212, and a guide sleeve 1213. The nut seat 1211 is threadedly connected to a lead screw 122. The cross plate 1212 is mounted on the nut seat 1211 and has a slot for the lead screw 122 to pass through. Two guide sleeves 1213 are mounted on the cross plate 1212 and are symmetrically distributed on both sides of the slot in the cross plate 1212. The guide sleeves 1213 penetrate the upper cover 31, which has a lifting hole 311 that matches the outer diameter of the guide sleeve 1213. The support plate 123 is fixedly connected to the upper ends of the two guide sleeves 1213 that pass through the upper cover 31 with screws. The corresponding arrangement of the guide sleeves 1213 and the lifting hole 311 serves as a guide, allowing the lifting component 121 to move vertically and linearly on the lead screw 122. The symmetrical arrangement of the guide sleeves 1213 improves the stability of the support plate 123 in supporting the lifting platform 2.

[0040] like Figure 6 and Figure 8As shown, four lifting support assemblies 12 are provided, and the four lifting support assemblies 12 are rectangularly distributed inside the housing 3. To enable the synchronous driving of the four lifting support assemblies 12, a specific method is shown here, wherein the first rotation drive component is a linkage seat assembly 11. The linkage seat assembly 11 can simultaneously drive the lead screws 122 of the four lifting support assemblies 12, thereby making the lifting components 121 on each lead screw 122 move up and down synchronously, ensuring that the lifting platform 2 is subjected to uniform force; moreover, the axes of the four lifting support assemblies 12 are all perpendicular to the lifting platform 2, and the vertical center line of the lifting platform 2 coincides with the vertical center line of the housing 3 (i.e., the housing 3 is located directly below the lifting platform 2), and the distances from the axes of the four lifting support assemblies 12 to the aforementioned vertical center line are equal. The synchronous displacement of the lifting components 121 ensures that the lifting platform 2 is always parallel to the upper surface of the housing 3, improving the stability of the sand box 5 during transportation.

[0041] like Figure 5 , Figure 6 and Figure 8As shown, the linkage seat assembly 11 includes an upper base plate 111, a lower base plate 112, a gear transmission assembly 113, and a first motor 114. The gear transmission assembly 113 includes a first driving gear 1131, a first driven gear 1132, and a lifting gear 1133. The lower base plate 112 is fixedly connected to the lower cover 33. The gear transmission assembly 113 is installed between the upper base plate 111 and the lower base plate 112. The upper and lower ends of the first driven gear 1132 are rotatably connected to the upper base plate 111 and the lower base plate 112, respectively. The lower ends of the first driving gear 1131 and the lifting gear 1133 are rotatably connected to the lower base plate 112, respectively. The first driving gear 1131 is located at the center of the lower base plate 112. The first motor 114... The main body is fixed on the upper plate 111 of the base. The output end of the first motor 114 passes through the upper plate 111 of the base and is coaxially fixedly connected to the first driving gear 1131. The combination of the first driven gear 1132 and the lifting gear 1133 is arranged in four groups in a cross shape around the first driving gear 1131. Each group includes one lifting gear 1133 and multiple first driven gears 1132. The multiple first driven gears 1132 in each group are linearly distributed and meshed in sequence. The first driven gear 1132 at one end meshes with the first driving gear 1131, and the first driven gear 1132 at the other end meshes with the lifting gear 1133. The four lifting gears 1133 are coaxially fixedly connected to the four lead screws 122 respectively. The structure in which the first driven gear 1132 and the lifting gear 1133 are arranged in a cross shape around the first driving gear 1131 achieves a uniform distribution of power. This ensures that the power of the first motor 114 can be transmitted evenly and synchronously to the four lifting support components 12, thereby achieving the effect of synchronous lifting of the four lifting support components 12. The first driving gear 1131 and the first driven gear 1132 are small gears, and the lifting gear 1133 is a large gear. The torque of the lead screw 122 is converted into a small torque on the lifting gear 1133 it is connected to. When the lifting platform 2 is under pressure, the force transmitted to the first motor 114 is even smaller, and it will hardly drive the first motor 114 to rotate. Therefore, when the lifting platform 2 is under pressure, the lead screw 122 will basically not rotate and drive the first motor 114 to rotate in the opposite direction. Thus, through the distribution of the gear set, the structure achieves a self-locking protection effect. Even if a power failure occurs, it is not easy to fall, forming the first line of defense for the height of the lifting platform 2.

[0042] like Figure 6 and Figure 9As shown, a limit protection mechanism 4 is provided on the upper plate 111 of the base. The limit protection mechanism 4 includes a second rotation drive, a rotation connector 41 and four sets of horizontal plate height protection components 46. The second rotation drive drives the rotation connector 41 to rotate and connect to the upper plate 111 of the base. The four sets of horizontal plate height protection components 46 are arranged on the rotation connector 41 in a cross-shaped arrangement of the combination of the first driven gear 1132 and the lifting gear 1133.

[0043] The second rotation drive component includes an angle rotation support 42, a second driven gear 43, a second driving gear 44, and a second motor 45. The rotation connector 41 is rotatably connected to the upper plate 111 of the base via the angle rotation support 42. The movable end of the angle rotation support 42 is fixedly connected to the lower part of the rotation connector 41, and the fixed end of the angle rotation support 42 is fixedly connected to the upper plate 111 of the base. The second driven gear 43 is fixed to the rotation connector 41. The axis of the second driven gear 43, the axis of the first driving gear 1131, and the vertical center line of the rotation connector 41 coincide. The body of the second motor 45 is fixedly connected to the upper plate 111 of the base. The output end of the second motor 45 is fixedly connected to the second driving gear 44. The second driving gear 44 meshes with the second driven gear 43. The center of both the second driven gear 43 and the rotation connector 41 has through holes that do not interfere with the first motor 114 driving the first driving gear 1131 to rotate. The second motor 45 drives the second driven gear 43 through the second driving gear 44 to rotate the rotating connector 41, so that the rotation axis of the rotating connector 41 coincides with the axis of the first driving gear 1131.

[0044] like Figure 10 and Figure 11 As shown, the horizontal plate height protection assembly 46 includes a translation connector 461, a horizontal plate connector 462, and a slide block 463; the translation connector 461 includes a first connecting rod 4611 and a second connecting rod 4612; the horizontal plate connector 462 includes a limiting member, a positioning seat 4621, a guide rod 4624, and a screw 4625.

[0045] The horizontal connecting piece 462 is connected to the rotating connecting piece 41 via the translation connecting piece 461.

[0046] Four sets of horizontal connecting pieces 462 are respectively disposed between the axes of the four lead screws 122 and the first driving gear 1131. The four sets of horizontal connecting pieces 462 slide synchronously in the direction of the line connecting the axes of their respective lead screws 122 and the first driving gear 1131. The four sets of horizontal connecting pieces 462 can synchronously move away from or synchronously move closer to their respective lifting support components 12. Since the rotation axis of the rotating connector 41 is consistent with the rotation axis of the first driving gear 1131, when the four sets of horizontal connecting pieces 462 move a certain distance relative to the rotating connector 41, the four sets of horizontal connecting pieces 462 also synchronously move the same distance relative to their respective lifting support components 12.

[0047] The slide block 463 is mounted on the base plate 111 with its track parallel to the line connecting the lead screw 122 and the first drive gear 1131. The transverse connecting piece 462 is laterally slidably connected to the slide block 463. One end of the first connecting rod 4611 is rotatably connected to the rotating connecting piece 41, and the other end is rotatably connected to one end of the second connecting rod 4612. The other end of the second connecting rod 4612 is fixedly connected to the positioning seat 4621 of the transverse connecting piece 462. A pulley 46211 is provided at the bottom of the positioning seat 4621, and the pulley 46211 is correspondingly connected to the slide block 463. When the rotating connecting piece 41 rotates, it drives the first connecting rod 4611 to rotate relative to the second connecting rod 4612. The transverse connecting piece 462 is restricted by the sliding direction of the slide block 463, so the second connecting rod 4612 will bring the transverse connecting piece 462 closer to or away from the rotating connecting piece 41. When the horizontal connecting piece 462 is in the position furthest from the rotating connecting piece 41, the first connecting rod 4611 and the second connecting rod 4612 remain parallel.

[0048] During the transportation of the sand box 5 by the trolley, the lifting platform 2 operates in two stages: first, before carrying the sand box 5 into the printing equipment, it lifts the sand box 5 to a height higher than the platform inside the printing equipment; second, before carrying the sand box 5 out of the printing equipment, it lifts the sand box 5 to a height higher than the platform inside the printing equipment. The height in these two stages remains consistent, and once the lifting height of the lifting platform 2 is set, it remains at that height during each lift. The limiting device serves as a second line of defense for the lifting platform 2 at this height.

[0049] A horizontal plate connecting groove 4620 is provided on the side of the limiting member near the lifting member 121. The protruding edge 12121 of the horizontal plate 1212 matches the size of the horizontal plate connecting groove 4620 of the limiting member. When the lifting member 121 is adjusted so that the height of the horizontal plate 1212 and the horizontal plate connecting groove 4620 are consistent, the horizontal plate connecting member 4622 slides away from the first driving gear 1131, and the protruding edge 12121 of the horizontal plate 1212 is inserted into the horizontal plate connecting groove 4620 of the limiting member. Thus, when the lifting platform 2 is stationary at a set height, the limiting member provides an additional force to keep the horizontal plate 1212 stable at this height on top of the first line of protection, improving the stability of the lifting platform 2 supporting the sand box 5.

[0050] Two limiting components can be configured: a lower limiting component 4622 and an upper limiting component 4623. These two components are arranged vertically, with the lower limiting component 4622 fixedly connected above the positioning seat 4621, and the upper limiting component 4623 positioned above the lower limiting component 4622. These two limiting components limit the horizontal piece 1212 at its higher and lower lifting height positions, respectively, increasing the selection of lifting heights and expanding its applicability. This allows for adaptive adjustments based on potential height limitations encountered during trolley transportation. For example, any setting where the bottom of the sand box 5 is higher than the platform inside the printing equipment can be used as the lifting height setting for the lifting platform 2. However, in some special cases where product space is limited, a higher lifting platform 2 might hinder the normal passage of the trolley carrying the sand box 5.

[0051] For the upper limit member 4623, besides the case where the upper limit member 4623 is fixedly connected to the lower limit member 4622 to determine its height, it can also be connected in a case where the upper limit member 4623 is height-adjustable relative to the lower limit member 4622. The lower end of the guide rod 4624 is fixedly connected to the lower limit member 4622, and its upper end passes through the through hole of the upper limit member 4623. A threaded groove 46221 is provided on the upper surface of the lower limit member 4622. A screw 4625 is threadedly connected to the lower limit member 4622 and the upper limit member 4623. The lower end of the screw 4625 passes through the upper limit member 4623 from top to bottom and connects to the threaded groove 46221. A screw hole 312 is provided on the upper cover 31 at a position corresponding to the screw 4625. The position of the screw hole 312 is as follows... Figure 6As shown. The guide rod 4624 ensures that the direction of the horizontal connecting groove 4620 of the upper limit member 4623 remains unchanged, moving only vertically. When adjusting the height of the upper limit member 4623 relative to the lower limit member 4622, the horizontal piece 1212 changes the height of the upper limit member 4623, and then the upper limit member 4623 and the lower limit member 4622 are fixed relative to each other by screws 4625. With the adjustable height upper limit member 4623, the lifting height of the lifting platform 2 can be flexibly changed, allowing for targeted adjustments to meet the needs of different production lines or different enterprises, increasing the applicability, and satisfying different environmental requirements or occasions without the need to produce new parts.

[0052] The lifting structure, through the self-locking protection of the lead screw 122 and gear set, forms the first line of defense for the height of the lifting platform 2, which can act throughout the entire process of lifting, maintaining the lifting height, and lowering the lifting platform 2 during transportation. In both the stages of placing the sand box 5 into the printing equipment and taking the sand box 5 out of the printing equipment, the lifting platform 2 is kept in the state of raising the sand box 5. Moreover, the trolley also needs to move in this state. Therefore, maintaining the stability of the lifting platform 2 is particularly important. The lifting structure, through the limiting component, can keep the lifting component 121 at this height, further keeping the sand box 5 stably in the raised state, forming a second line of defense and improving transportation safety.

[0053] Working process: During the transportation of the trolley, before the lifting platform 2 carrying the sand box 5 enters the printing equipment, the lifting platform 2 is first lifted. The first motor 114 drives the first drive gear 1131 to rotate, which synchronously drives the first driven gears 1132 and the lifting gear 1133 in four directions to rotate. The lead screws 122 of the four sets of lifting support components 12 rotate synchronously, and the four sets of lifting components 121 connected to the lifting platform 2 move upward as a whole, raising the sand box 5. The lifting components 121 stop moving upward when they reach the height of one of the selected limit components. When the lifting platform 2 is at this height, the second motor 45 drives... The second driving gear 44 rotates, and simultaneously the second driven gear 43 drives the rotating connecting member 41 to rotate. The first connecting rod 4611 of the four sets of horizontal plate height protection components 46 rotates synchronously relative to the second connecting rod 4612, forming a state where the first connecting rod 4611 and the second connecting rod 4612 are parallel. This pushes the four sets of horizontal plate connecting members 462 synchronously away from the rotating connecting member 41. The horizontal plate connecting groove 4620 of the selected limiting member is then inserted into the position of the protrusion 12121 of the horizontal plate 1212 of the appropriate height, keeping the horizontal plate 1212 stable at this height, and increasing the lifting platform 2 at this height. The height protection is then implemented; then the lifting platform 2 of the trolley, carrying the sand box 5, enters the printing equipment and stops at a suitable position. The second motor 45 drives the second drive gear 44 to rotate again, and at the same time, the second driven gear 43 drives the rotating connecting piece 41 to rotate. The first connecting rod 4611 of the four sets of horizontal plate height protection components 46 rotates synchronously relative to the second connecting rod 4612, forming an angle between the first connecting rod 4611 and the second connecting rod 4612. This causes the four sets of horizontal plate connecting pieces 462 to be pulled synchronously closer to the rotating connecting piece 41. The horizontal plate connecting groove 4620 of the selected limiting piece then connects with the horizontal plate. When the convex edge 12121 of 1212 separates, the height protection of the lifting platform 2 at this height is canceled. Then, the first motor 114 drives the first active gear 1131 to rotate in the opposite direction, which in turn drives the first driven gears 1132 and the lifting gear 1133 in the four directions to rotate in the opposite direction. The lead screws 122 of the four sets of lifting support components 12 rotate in the opposite direction in the same way. The four sets of lifting components 121 connected to the lifting platform 2 move downward as a whole, thereby completing the descent of the lifting platform 2, lowering the height of the sand box 5, and allowing the sand box 5 to fall on the platform inside the printing equipment, thus completing the operation of sending the sand box 5 into the printing equipment.

[0054] After the sand box 5 finishes printing, the trolley takes the sand box 5 out of the printing equipment. The trolley first repeats the above lifting steps with the lifting platform 2. The lifting platform 2 moves upward to contact the bottom of the sand box 5 and makes the lifting platform 2 higher than the platform inside the printing equipment, so that the sand box 5 falls on the lifting platform 2. The positioning concave part 21 and the positioning convex part 22 assist in the connection between the two. The operation of each of the above limiting parts limiting the horizontal piece 1212 is repeated again to stabilize the lifting platform 2 at this height. Then the trolley takes the sand box 5 away from the printing equipment. After leaving, the above-mentioned lifting platform 2 lowering operation is repeated to lower the center of gravity of the sand box 5 and transport it to the next stage.

[0055] If the height of the upper limit member 4623 needs to be adjusted specifically, the operation must be carried out without transporting the sand box 5. First, repeat the above lifting operation to position the height of the lifting member 121 to the original height of the upper limit member 4623. Then, repeat the above operation to protect the height of the lifting platform 2. The horizontal plate connecting groove 4620 of the upper limit member 4623 is inserted into the position of the protruding edge 12121 of the horizontal plate 1212. At this time, use a tool to remove the screws 4625 from the upper limit member 4623 and the lower limit member 4622 through the four screw holes 312. The second motor 45 drives the adjustment of the lifting member 121 to the new height. Without the screws 4625, the upper limit member 4623 can be adjusted to the new height of the upper limit member 4623 along with the lifting member 121. In this state, install the screws 4625 again to connect the upper limit member 4623 and the lower limit member 4622, thereby completing the adjustment of the height of the upper limit member 4623.

[0056] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions has not been described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A heavy-duty four-point synchronous lifting structure, comprising a lifting mechanism (1), a lifting platform (2), and a housing (3), wherein the lifting mechanism (1) is installed inside the housing (3), the lifting mechanism (1) passes through the housing (3) and is connected to the lifting platform (2) above it, and the lifting platform (2) is raised and lowered relative to the housing (3) by the lifting mechanism (1), characterized in that: The lifting mechanism (1) includes a driving component and a lifting support assembly (12). The housing (3) includes an upper cover (31) and a lower cover (33). The body of the driving component is mounted on the lower cover (33). The driving component drives the movable end of the lifting support assembly (12) to move vertically. The top end of the movable end of the lifting support assembly (12) passes through the upper cover (31) and is fixedly connected to the lifting platform (2). The driving component is a first rotation driving component. The lifting support assembly (12) includes a lead screw (122), a support plate (123), and a lifting component (121) as the movable end. The first rotation driving component drives the bottom end of the lead screw (122) to rotate. The top end of the lead screw (122) is rotatably connected to the upper cover (31). The lifting component... (121) The threaded connection is on the lead screw (122). The lifting component (121) moves only in the vertical direction. The lifting component (121) passes through the top of the upper cover (31) and is fixedly connected to the lifting platform (2) through the support plate (123). Four lifting support components (12) are provided. The four lifting support components (12) are distributed in a rectangular shape in the housing (3). The linkage seat assembly (11) of the first rotation drive component drives the lead screw (122) of the four lifting support components (12) simultaneously. The linkage seat assembly (11) includes an upper base plate (111), a lower base plate (112), a gear transmission assembly (113), and a first motor (114). The gear transmission assembly (113) The system includes a first driving gear (1131), a first driven gear (1132), and a lifting gear (1133). The lower base plate (112) is fixedly connected to the lower cover (33). The gear transmission assembly (113) is installed between the upper base plate (111) and the lower base plate (112). The first driving gear (1131) is located at the center of the lower base plate (112). The body of the first motor (114) is fixed on the upper base plate (111). The output end of the first motor (114) passes through the upper base plate (111) and is coaxially fixedly connected to the first driving gear (1131). The combination of the first driven gear (1132) and the lifting gear (1133) is designed... Four groups are arranged in a cross shape around the first driving gear (1131). Each group includes a lifting gear (1133) and multiple first driven gears (1132). The multiple first driven gears (1132) in each group are arranged in a straight line and meshed in sequence. The first driven gear (1132) at one end meshes with the first driving gear (1131), and the first driven gear (1132) at the other end meshes with the lifting gear (1133). The four lifting gears (1133) are respectively coaxially fixedly connected to the four lead screws (122). The first driving gear (1131) and the first driven gear (1132) are small gears, and the lifting gear (1133) is a large gear.

2. The heavy-duty four-point synchronous lifting structure according to claim 1, characterized in that: The lifting component (121) includes a nut seat (1211), a cross plate (1212), and a guide sleeve (1213). The nut seat (1211) is threadedly connected to a lead screw (122). The cross plate (1212) is disposed on the nut seat (1211) and has a slot for the lead screw (122) to pass through. The guide sleeve (1213) is disposed on the cross plate (1212) and passes through the upper cover (31). The upper cover (31) has a lifting hole (311) that matches the outer diameter of the guide sleeve (1213). The support plate (123) is fixedly connected to the upper end of the guide sleeve (1213) that passes through the upper cover (31) with a screw.

3. The heavy-duty four-point synchronous lifting structure according to claim 1, characterized in that: A limiting protection mechanism (4) is provided on the upper plate (111) of the base. The limiting protection mechanism (4) includes four sets of horizontal plate height protection components (46). Each horizontal plate height protection component (46) includes a horizontal plate connector (462). The four sets of horizontal plate connectors (462) are respectively arranged between the axes of the four lead screws (122) and the first driving gear (1131). The four sets of horizontal plate connectors (462) slide synchronously in the direction of the line connecting the axes of their respective lead screws (122) and the first driving gear (1131). The connector (462) includes a limiting member. A horizontal plate connecting groove (4620) is provided on the side of the limiting member close to the lifting member (121). The lifting member (121) includes a horizontal plate (1212) in the middle. The lifting member (121) is adjusted so that the horizontal plate (1212) and the horizontal plate connecting groove (4620) are at the same height, so that the horizontal plate connector (462) slides away from the first driving gear (1131). The protruding edge (12121) of the horizontal plate (1212) is inserted into the horizontal plate connecting groove (4620) of the limiting member.

4. The heavy-duty four-point synchronous lifting structure according to claim 3, characterized in that: The limiting protection mechanism (4) further includes a second rotation drive and a rotation connector (41). The second rotation drive drives the rotation connector (41) to rotate and connect above the upper plate (111) of the base. The four sets of the horizontal plate height protection components (46) are arranged on the rotation connector (41) in a cross-shaped arrangement of the combination of the first driven gear (1132) and the lifting gear (1133). The horizontal plate height protection components (46) further include a translation connector (461) and a slide (463). The translation connector (461) includes a first connecting rod. (4611) and the second connecting rod (4612), the slide (463) is mounted on the base plate (111) with its track parallel to the line connecting the axis of the lead screw (122) and the first driving gear (1131), the transverse connecting piece (462) is slidably connected to the slide (463), one end of the first connecting rod (4611) is rotatably connected to the rotating connecting piece (41), and the other end is rotatably connected to one end of the second connecting rod (4612), and the other end of the second connecting rod (4612) is fixedly connected to the transverse connecting piece (462).

5. The heavy-duty four-point synchronous lifting structure according to claim 3, characterized in that: Two limiting components are provided, namely a lower limiting component (4622) and an upper limiting component (4623). The horizontal connecting component (462) also includes a positioning seat (4621). The lower limiting component (4622) and the upper limiting component (4623) are arranged vertically. The lower limiting component (4622) is fixedly connected above the positioning seat (4621), and the upper limiting component (4623) is located above the lower limiting component (4622).

6. The heavy-duty four-point synchronous lifting structure according to claim 5, characterized in that: The horizontal connecting piece (462) further includes a guide rod (4624) and a screw (4625). The lower end of the guide rod (4624) is fixedly connected to the lower limit piece (4622), and the upper end passes through the through hole of the upper limit piece (4623). The upper surface of the lower limit piece (4622) is provided with a threaded groove (46221). The screw (4625) is threadedly connected to the lower limit piece (4622) and the upper limit piece (4623). The lower end of the screw (4625) passes through the upper limit piece (4623) from top to bottom and is connected to the threaded groove (46221).

7. The heavy-duty four-point synchronous lifting structure according to claim 1, characterized in that: The lifting platform (2) is placed on a sand box (5). Four positioning recesses (21) are symmetrically distributed on the part of the lifting platform (2) that extends beyond the outer diameter of the upper cover (31) in the horizontal direction. Positioning protrusions (22) that match the size of the positioning recesses (21) are installed at the corresponding positions at the bottom of the sand box (5).

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