Large-tonnage lifting platform

Abstract

A large-tonnage lifting platform comprises a bottom platform, a corresponding top platform is arranged above the bottom platform, the bottom platform and the top platform are connected through a lifting device with a hydraulic system, and the hydraulic system is further associated with an electric control system. The lifting device comprises an inner lifting arm and an outer lifting arm which are crossed in a shear mode, the outer lifting arm is sleeved on an outer ring of the inner lifting arm, corresponding mandrels are arranged in the middles of the inner lifting arm and the outer lifting arm, the inner lifting arm and the outer lifting arm are rotatably connected together through the mandrels, and the top end of the outer lifting arm and the bottom end of the inner lifting arm are fixed ends of the outer lifting arm and the inner lifting arm. The bottom end of the outer lifting arm and the top end of the inner lifting arm are free ends of the outer lifting arm and the inner lifting arm, and the free ends of the outer lifting arm and the inner lifting arm are slidably connected to the top face of the bottom table and the other side end, opposite to the fixed ends of the outer lifting arm and the inner lifting arm, of the bottom face of the top table respectively. And the hydraulic system is arranged between the outer lifting arm and the inner lifting arm. The utility model has the advantages of simple structure, convenience in operation, larger bearing capacity and better stability.

Description

Technical Field

[0001] This utility model belongs to the field of lifting platform technology, and in particular relates to a lifting platform for vertical transportation of large-tonnage materials. Background Technology

[0002] Lifting platforms are a type of cargo lifting equipment with a wide range of applications. They are widely used in industrial production and warehousing logistics, mainly for the vertical transport of materials between different heights, such as loading or unloading materials on production lines.

[0003] Traditional lifting platforms are prone to instability during vertical lifting due to lateral deviation, leading to tilting, swaying, and even structural damage. This is especially true when transporting heavy materials, such as in the online and offline transportation of calcium silicate boards. The lifting device needs to withstand excessive pressure due to the weight of the materials, causing the lifting platform to become unstable and prone to overturning. This not only threatens the personal safety of surrounding workers and poses a danger, but also easily damages the goods, thus affecting the production of calcium silicate boards. Therefore, traditional lifting platforms are not suitable for the vertical transportation of heavy materials. Utility Model Content

[0004] The purpose of this utility model is to provide a lifting platform for vertical transportation of large-tonnage materials, so as to solve the technical problems of instability during lifting of traditional lifting platforms, especially the poor vertical transportation capacity when transporting large-tonnage materials.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] A large-tonnage lifting platform includes a base platform and a corresponding top platform above the base platform. The two are connected to each other by a lifting device with a hydraulic system, wherein the hydraulic system is also associated with an electrical control system.

[0007] The lifting device includes an inner lifting arm and an outer lifting arm that are scissor-shaped and cross each other. The outer lifting arm is fitted around the outer ring of the inner lifting arm. The two arms have corresponding spindles in the middle and are rotatably connected together by the spindles. The top end of the outer lifting arm and the bottom end of the inner lifting arm are the fixed ends of the two arms. The fixed ends of the two arms are rotatably connected to the bottom surface of the top platform and the top surface of the bottom platform, respectively, on the same side. The bottom end of the outer lifting arm and the top end of the inner lifting arm are the free ends of the two arms. The free ends of the two arms are slidably connected to the top surface of the bottom platform and the other side of the bottom surface of the top platform, respectively, opposite to the fixed ends of the two arms. The hydraulic system is located between the outer lifting arm and the inner lifting arm.

[0008] Furthermore, the outer lifting arm includes a pair of parallel lifting rods that are mirror-image corresponding to each other along the centerline, and the inner lifting arm includes a pair of parallel lifting rods that are mirror-image corresponding to each other along the centerline. The two outer lifting rods and the two inner lifting rods are paired on the front and back sides of the centerline. The two outer lifting rods are respectively located outside the two inner lifting rods. The two pairs of inner and outer lifting rods are rotatably connected together by a pair of coaxially corresponding spindles. The top ends of the two outer lifting rods are rotatably connected to the front and back sides of one side of the bottom surface of the top platform. The bottom ends of the two inner lifting rods are rotatably connected to the front and back sides of the top surface of the bottom platform and the same side as the top ends of the outer lifting rods. The lower ends of the outer lifting rods and the top ends of the inner lifting rods are each equipped with rotatably connected rollers. The two outer lifting rods are slidably connected to the front and back sides of the top surface of the bottom platform opposite to their top ends by the two rollers at their bottom ends. The two inner lifting rods are slidably connected to the front and back sides of the bottom surface of the top platform opposite to their bottom ends by the two upper rollers at their top ends.

[0009] Furthermore, a pair of parallel first fixing rods are provided on the upper and lower sides between the two outer lifting rods, and the two ends of the first fixing rods are fixedly connected to the two outer lifting rods respectively. A pair of parallel second fixing rods are provided on the upper and lower sides between the two inner lifting rods, and the two ends of the second fixing rods are fixedly connected to the two inner lifting rods respectively. The first fixing rods and the second fixing rods are parallel to each other and perpendicular to the outer lifting rods and the inner lifting rods respectively.

[0010] Furthermore, the hydraulic system includes a pair of hydraulic cylinders corresponding to each other between the two inner lifting rods, which are linked together. A connecting rod parallel to the first fixed rod is provided between the two inner lifting rods and connected above the spindle. Its two ends are respectively fixedly connected to the two inner lifting rods. The connecting rod is provided with two pairs of corresponding adapter blocks. The upper part of the connecting block is provided with a connecting hole. A connecting shaft is provided between each pair of connecting blocks. The first fixed rod below the spindle is provided with a pair of adapter seats corresponding to the two pairs of connecting blocks. The bottom ends of the two hydraulic cylinders are respectively rotatably connected to the two adapter seats. The top of the hydraulic cylinder is provided with a corresponding telescopic rod. The top of the telescopic rod is rotatably connected to the connecting shaft on the corresponding side. The hydraulic system is associated with the electronic control system through the hydraulic cylinders.

[0011] Furthermore, the base platform includes a base plate with mounting holes. The top surface of the base plate has a pair of lower bases corresponding to the two inner lifting rods and a pair of lower sliding tracks corresponding to the two outer lifting rods. The bottom ends of the two inner lifting rods are rotatably connected to the two lower bases, and the rollers at the bottom ends of the two outer lifting rods abut against the two lower sliding tracks.

[0012] Furthermore, the top platform includes a top plate, on the top surface of which is provided a pair of parallel and corresponding guide rails, and on the bottom surface of the top plate are provided a pair of upper bases corresponding to the two outer lifting rods and a pair of upper slides corresponding to the two inner lifting rods. The top ends of the two outer lifting rods are rotatably connected to the two upper bases, and the rollers at the top ends of the two inner lifting rods abut against the two upper slides.

[0013] This utility model of a large-tonnage lifting platform has a simple structure, is easy to operate and manufacture, has a stable center of gravity, provides better stability when transporting goods, is less prone to tipping over, has a better load-bearing capacity, is suitable for vertical transport of larger tonnage materials, has better safety, and a lower damage rate during transportation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 This utility model Figure 1 Left view of the hydraulic system when it is retracted;

[0017] Figure 4 This utility model Figure 3 Rear view;

[0018] The markings in the diagram are as follows: 1. Base platform; 11. Base plate; 12. Mounting hole; 13. Lower base; 14. Lower slide rail; 2. Top platform; 21. Top plate; 22. Guide rail; 23. Upper base; 24. Upper slide rail; 3. Lifting device; 31. Inner lifting arm; 32. Inner lifting rod; 33. Second fixed rod; 34. Outer lifting arm; 35. Outer lifting rod; 36. First fixed rod; 37. Spindle; 38. Roller; 39. Connecting rod; 4. Hydraulic system; 41. Hydraulic cylinder; 42. Adapter block; 43. Connecting shaft; 44. Adapter seat; 45. Telescopic rod. Detailed Implementation

[0019] To better understand the purpose, structure, and function of this utility model, a large-tonnage lifting platform of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] like Figure 1-4 As shown, the large-tonnage lifting platform of this utility model includes a base platform 1 and a top platform 2, which correspond to each other. The top platform 2 is located above the base platform 1, and a lifting device 3 with a hydraulic system 4 is installed between the two. The hydraulic system 4 is also connected to an electrical control system. During operation, the material to be transported is placed above the top platform 2. Under the control of the electrical control system, the hydraulic system 4 changes the distance between the top platform 2 and the base platform 1 through the lifting device 3, thereby realizing the lifting of the top platform 2 and thus realizing the vertical transportation of the material above the top platform 2.

[0021] The lifting device 3 includes a corresponding inner lifting arm 31 and an outer lifting arm 34. The outer lifting arm 34 is fitted around the outer ring of the inner lifting arm 31. A corresponding spindle 37 is provided in the middle of both arms, and they are scissor-shaped and rotatably connected together via the spindle 37. The top end of the outer lifting arm 34 is rotatably connected to the left side of the bottom surface of the top platform 2, and its bottom end is slidably connected to the right side of the top surface of the bottom platform 1. The top end of the inner lifting arm 31 is rotatably connected to the left side of the top surface of the bottom platform 1, and its bottom end is slidably connected to the right side of the bottom surface of the top platform 2. A hydraulic system 4 is installed between the outer lifting arm 34 and the inner lifting arm 31. In this embodiment, the bottom end of the hydraulic system 4 is rotatably connected to the outer lifting arm 34, and its top end is rotatably connected to the inner lifting arm 31. The outer lifting arm 34 is connected to the top platform 2 and the inner lifting arm 31. The end of the lifting arm 31 that is rotatably connected to the base platform 1 is the fixed end of both, and the end of the outer lifting arm 34 that is slidably connected to the base platform 1 and the inner lifting arm 31 that is slidably connected to the top platform 2 is the free end of both. Under the control of the electronic control system, the hydraulic system 4 applies force to the outer lifting arm 34 and the inner lifting arm 31 by telescoping. With the assistance of the sliding cooperation between the free ends of both and the top platform 2 and the base platform 1, the outer lifting arm 34 and the inner lifting arm 31 rotate around their respective fixed ends under the action of force, thereby changing the cross angle between the outer lifting arm 34 and the inner lifting arm 31. The projection height of the lifting device 3 in the vertical direction changes accordingly, and the distance between the top platform 2 and the base platform 1 is adjusted synchronously, thereby achieving the purpose of vertical transportation of materials above the top platform 2.

[0022] Furthermore, the outer lifting arm 34 includes a pair of parallel outer lifting rods 35, with a first fixing rod 36 between them. The two ends of the first fixing rod 36 are fixedly connected to the inner sidewalls of the two outer lifting rods 35. The inner lifting arm 31 includes a pair of parallel inner lifting rods 32, with a second fixing rod 33 between the two inner lifting rods 32. The two ends of the second fixing rod 33 are fixedly connected to the inner sidewalls of the two inner lifting rods 32. In this embodiment, a pair of parallel first fixing rods 36 are provided on the upper and lower sides between the two outer lifting rods 35, and a pair of parallel second fixing rods 33 are provided on the upper and lower sides between the two inner lifting rods 32. The first fixing rod 36 is perpendicular to the outer lifting rods 35, and the second fixing rod 33 is perpendicular to the inner lifting rods 32. 2. The first fixed rod 36 and the second fixed rod 33 are parallel to each other, which improves the stability of both the outer lifting arm 34 and the inner lifting arm 31. The two outer lifting rods 35 and the two inner lifting rods 32 are mirror images of each other on the front and rear sides of the top platform 2 and the bottom platform 1 along the centerline. The two outer lifting rods 35 are respectively located outside the two inner lifting rods 32. The two pairs of inner and outer lifting rods 35 are rotatably connected by corresponding spindles 37. Specifically, the outer lifting rod 35 on the front side corresponds to the inner lifting rod 32 on the front side and is located in front of the inner lifting rod 32. The outer lifting rod 35 on the rear side corresponds to the inner lifting rod 32 on the rear side and is located behind the inner lifting rod 32. This allows the outer lifting arm 34 to be fitted onto the inner lifting arm 31. The outer ring of the outer lifting arm 34 has a pair of coaxial spindles 37 at the middle of the two pairs of inner and outer lifting rods 35. The middle of the two inner lifting rods 32 has a pair of corresponding inner through holes, and the middle of the two outer lifting rods 35 has a pair of corresponding outer through holes. The front and rear ends of the front spindle 37 pass through the outer through holes of the front outer lifting rod 35 and the inner through holes of the front inner lifting rod 32, respectively, rotatably connecting them together. The front and rear ends of the rear spindle 37 pass through the inner through holes of the rear inner lifting rod 32 and the rear outer lifting rod 35, respectively, rotatably connecting them together. Thus, the spindles 37 rotatably connect the outer lifting arm 34 and the inner lifting arm 31 together. The outer lifting arm 34 and the inner lifting arm 31 are arranged in a reverse, cross-shaped configuration. The top ends of rod 35 are rotatably connected to the front and rear sides of the left side of the bottom surface of the top platform 2 via corresponding pivots. This end is the fixed end of the outer lifting arm 34. The bottom ends of the two inner lifting rods 32 are rotatably connected to the front and rear sides of the left side of the top surface of the base platform 1 via corresponding pivots. This end is the fixed end of the inner lifting arm 31. The bottom end of the outer lifting rod 35 is the free end of the outer lifting arm 34, and the top end of the inner lifting rod 32 is the free end of the inner lifting arm 31. Rollers 38 are rotatably connected to the free ends of both the outer lifting rod 35 and the inner lifting rod 32. The roller 38 located at the bottom of the outer lifting rod 35 is the lower roller 38. The two outer lifting rods 35 are slidably connected to the front and rear sides of the right side of the top surface of the base platform 1 via the two lower rollers 38. The roller 38 located at the top of the inner lifting rod 32 is the upper roller 38.The two inner lifting arms 32 are slidably connected to the front and rear sides of the right side of the bottom surface of the top platform 2 via two upper rollers 38. This arrangement allows for smoother sliding between the outer lifting arm 34 and the inner lifting arm 31 and the top platform 2 and the bottom platform 1, resulting in less friction and more stable lifting of the top platform 2 when the outer lifting arm 34 and the inner lifting arm 31 interact to raise the top platform 2.

[0023] Furthermore, the hydraulic system 4 includes hydraulic cylinders 41. In this embodiment, a pair of hydraulic cylinders 41 are interconnected between the two inner lifting rods 32. The two hydraulic cylinders 41 are parallel to each other and mirror-image along the centerline. A corresponding connecting rod 39 is provided between the two inner lifting rods 32. The connecting rod 39 is parallel to the second fixed rod 33 and is located above the spindle 37. The two ends of the connecting rod 39 are fixedly connected to the inner sidewalls of the two inner lifting rods 32. The connecting rod 39 is provided with two pairs of parallel connecting blocks 42. The bottom of the connecting blocks is fixedly connected to the connecting rod 39. The two pairs of connecting blocks 42 are mirror-image along the center of the inner lifting arm 31. The upper part of the connecting block is provided with a connecting hole. A corresponding connecting shaft 43 is provided between each pair of connecting blocks. The two ends of the connecting shaft 43 are rotatably connected to the two connecting blocks. Inside the connecting hole, on the top surface of the first fixed rod 36 at the lower end, there is a transition seat 44 corresponding to the two pairs of connecting blocks. The bottom ends of the two hydraulic cylinders 41 are rotatably connected to the transition seats 44 on the corresponding sides. The top of each hydraulic cylinder 41 is provided with a corresponding telescopic rod 45. The top of the telescopic rod 45 is rotatably connected to the connecting shaft 43 on the corresponding side. The hydraulic system 4 is associated with the electrical control system through the hydraulic cylinders 41. The two hydraulic cylinders 41 work synchronously under the control of the electrical control system. The two telescopic rods 45 extend and retract synchronously under the action of the two hydraulic cylinders 41. Thus, through the first fixed rod 36 and the connecting rod 39 at the bottom end, the external lifting arm 34 and the internal lifting arm 31 are simultaneously forced, so that the angle between the two and the horizontal line increases or decreases synchronously, thereby changing the height of the top platform 2 relative to the bottom platform 1, and realizing the vertical transportation of materials above the top platform 2.

[0024] The base platform 1 includes a base plate 11. The base plate 11 has a mounting hole 12 in the middle. The base plate 11 can be externally fixed to the appropriate position by connecting bolts through the mounting hole 12. The top surface of the base plate 11 is provided with a lower base 13 and a lower slide rail 14. The base platform 1 is connected to the lifting device 3 through the lower base 13 and the lower slide rail 14. In this embodiment, the lower base 13 and the lower slide rail 14 are arranged in pairs. The two lower bases 13 correspond to the two inner lifting rods 32 respectively. The pair of lower bases 13 corresponding to the front and rear are fixedly installed on the front and rear sides of the left side of the top surface of the base plate 11. The bottom ends of the two inner lifting rods 32 are rotatably connected to the two lower bases 13 respectively. The lower slide rail 14 corresponds to the outer lifting rods 35. The pair of lower slide rails 14 corresponding to the front and rear are fixedly installed on the front and rear sides of the right side of the top surface of the base plate 11 respectively. The rollers 38 at the bottom of the two outer lifting rods 35 respectively abut against the two lower slide rails 14. During operation, the lower slide rail 14 provides guidance for the rolling of the rollers 38 at the bottom of the outer lifting rods 35.

[0025] The top platform 2 includes a top plate 21. A pair of parallel guide rails 22 are provided on the top surface of the top plate 21. During operation, the guide rails 22 can be connected to the production line's tracks, allowing the material carts of the production line to slide onto the guide rails 22. This enables vertical transport of materials in the carts through the up-and-down movement of the top platform 2. The bottom surface of the top plate 21 is provided with an upper base 23 and an upper slide rail 24. The top platform 2 is connected to the lifting device 3 via the upper base 23 and the upper slide rail 24. In this embodiment, the upper base 23 and the upper slide rail 24 are also arranged in pairs. Corresponding to the outer lifting rod 35, a pair of corresponding upper bases 23 are fixedly installed on the front and rear sides of the left side of the bottom surface of the top plate 21. The top ends of the two outer lifting rods 35 are rotatably connected to the two upper bases 23. The upper slide rail 24 corresponds to the inner lifting rod 32. A pair of corresponding upper slide rails 24 are fixedly installed on the front and rear sides of the right side of the bottom surface of the top plate 21. The rollers 38 at the top of the two inner lifting rods 32 abut against the two upper slide rails 24. During operation, the upper slide rail 24 synchronously provides guidance for the rolling of the rollers 38 at the top of the inner lifting rods 32.

[0026] The electrical control system includes an electrical control box associated with the hydraulic cylinder 41 of the lifting device. An operation panel is provided on the side wall of the electrical control box, through which the operator presets and controls the operation of the ginger platform.

[0027] In use, firstly, the lifting platform is fixedly installed at an appropriate position on the production line via the base platform 1, so that its guide rail 22 can connect with the online track when in a high position and with the offline track when in a low position. When it is necessary to transport materials from the production line to the offline track, the hydraulic cylinder 41 is controlled by the electrical control system to extend its telescopic rod 45 outward. Under the action of the hydraulic system 4, the angle between the inner lifting arm 31 and the outer lifting arm 34 and the horizontal plane increases synchronously. At this time, the rollers 38 at the ends of the two arms roll synchronously to the left side of the top platform 2 and the base platform 1. The vertical projection height of the inner lifting arm 31 and the outer lifting arm 34 gradually increases as the telescopic rod 45 extends. In this way, the height of the top platform 2 gradually rises until the guide rail 22 connects with the track on the production line and stops. At this time, the operator can control the trolley loaded with materials on the online track to slide onto the guide rail 22. Then, the electrical control system controls the... The hydraulic cylinder 41 is controlled to retract its telescopic rod 45 inward. The angle between the inner lifting arm 31 and the outer lifting arm 34 and the horizontal plane decreases synchronously. At this time, the rollers 38 at the ends of the two arms roll synchronously to the right side of the top platform 2 and the bottom platform 1. The vertical projection height of the inner lifting arm 31 and the outer lifting arm 34 gradually decreases as the telescopic rod 45 extends. In this way, the height of the top platform 2 gradually decreases until the guide rail 22 is connected to the lower track of the production line and stops. At this time, the operator can control the material trolley on the guide rail 22 to slide onto the lower track. In this way, one material transportation from the line to the line is completed. If it is necessary to transport materials from the line to the line, the above operation is reversed. The materials to be processed are loaded into the trolley below the line, and then the trolley is lifted to the line height by the lifting platform. Finally, the trolley is slid onto the upper track to transport the materials to the line processing production line.

[0028] This utility model of a large-tonnage lifting platform has a simple structure and is easy to operate. The scissor lifting device 3 it adopts allows the free ends of the inner lifting arm 31 and the outer lifting arm 34 to slide synchronously in the same direction along the slide rail during lifting, so that the center of gravity of the lifting platform is always in the middle position. This not only improves the stability of the platform when transporting materials, but also increases the weight of materials that the lifting platform can bear, enabling it to bear materials of greater tonnage. Moreover, it has a lower possibility of tipping over when carrying heavy materials, making it safer, and the possibility of damage to the goods carried on it due to the instability of the lifting platform is also smaller.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A large tonnage lifting platform characterized by, It includes the bottom platform (1), the top platform (2) is arranged above the bottom platform (1), and the two are connected with each other through the lifting device (3) with a hydraulic system (4), wherein the hydraulic system (4) is also associated with an electric control system; The lifting device (3) includes inner lifting arms (31) and outer lifting arms (34) that are cross-shaped, wherein the outer lifting arms (34) are sleeved on the outer circle of the inner lifting arms (31), the middle parts of the two are provided with corresponding shafts (37), the two are rotatably connected together through the shafts (37), the top end of the outer lifting arms (34) and the bottom end of the inner lifting arms (31) are fixed ends of the two, the fixed ends of the two are rotatably connected to the corresponding same side ends on the bottom surface of the top platform (2) and the top surface of the bottom platform (1) respectively, the bottom end of the outer lifting arms (34) and the top end of the inner lifting arms (31) are free ends of the two, the free ends of the two are slidably connected to the other side ends on the top surface of the bottom platform (1) and the bottom surface of the top platform (2) respectively, and the hydraulic system (4) is arranged between the outer lifting arms (34) and the inner lifting arms (31).

2. The large-tonnage lifting platform according to claim 1, characterized in that The outer lifting arms (34) include a pair of outer lifting rods (35) that are parallel in front and back and mirror image corresponding along the center line, and the inner lifting arms (31) include a pair of inner lifting rods (32) that are parallel in front and back and mirror image corresponding along the center line, the two outer lifting rods (35) and the two inner lifting rods (32) correspond to each other on the front and back sides of the center line, wherein the two outer lifting rods (35) are respectively arranged on the outer sides of the two inner lifting rods (32), the two pairs of inner and outer lifting rods (35) are rotatably connected together through a pair of coaxial shafts (37), the top ends of the two outer lifting rods (35) are rotatably connected to the front and back sides of one side end on the bottom surface of the top platform (2), the bottom ends of the two inner lifting rods (32) are rotatably connected to the front and back sides of the same side end on the top surface of the bottom platform (1) and the top ends of the outer lifting rods (35), the lower ends of the outer lifting rods (35) and the top ends of the inner lifting rods (32) are all provided with rotatably connected rollers (38), wherein the two outer lifting rods (35) are slidably connected to the front and back sides of the side end on the top surface of the bottom platform (1) opposite to the top end thereof through the two rollers (38) at the bottom ends thereof, and the two inner lifting rods (32) are slidably connected to the front and back sides of the side end on the bottom surface of the top platform (2) opposite to the bottom ends thereof through the two upper rollers (38) at the top ends thereof.

3. The large-tonnage lifting platform according to claim 2, wherein, A pair of first fixed rods (36) are arranged on the upper and lower sides between the two outer lifting rods (35) and correspond in parallel, the two ends of the first fixed rods (36) are fixedly connected to the two outer lifting rods (35) respectively, a pair of second fixed rods (33) are arranged on the upper and lower sides between the two inner lifting rods (32) and correspond in parallel, the two ends of the second fixed rods (33) are fixedly connected to the two inner lifting rods (32) respectively, the first fixed rods (36) and the second fixed rods (33) correspond to each other in parallel, and are perpendicular to the outer lifting rods (35) and the inner lifting rods (32) respectively.

4. The large-tonnage lifting platform according to claim 3, wherein, The hydraulic system (4) includes a pair of hydraulic cylinders (41) corresponding in front and back between the two inner lifting rods (32), which are interlinked, and a connecting rod (39) corresponding in parallel to the first fixed rod (36) is arranged between the two inner lifting rods (32), which is arranged above the mandrel (37) and is fixedly connected at both ends to the two inner lifting rods (32), and the connecting rod (39) is provided with two pairs of adapter blocks (42) corresponding in front and back, and the connecting blocks are provided with connecting holes in the upper part, and each pair of connecting blocks is provided with a rotatingly connected connecting shaft (43), and the first fixed rod (36) below the mandrel (37) is provided with a pair of adapter seats (44) corresponding to the two pairs of connecting blocks, respectively, and the bottom ends of the two hydraulic cylinders (41) are rotatably connected to the two adapter seats (44), and the top of the hydraulic cylinder (41) is provided with a corresponding telescopic rod (45), and the top of the telescopic rod (45) is rotatably connected to the corresponding side connecting shaft (43), and the hydraulic system (4) is associated with the electric control system through the hydraulic cylinder (41).

5. The large-tonnage lifting platform according to claim 2, wherein, The bottom stand (1) includes a bottom plate (11), and the bottom plate (11) is provided with a mounting hole (12), and the top surface of the bottom plate (11) is provided with a pair of lower bases (13) corresponding to the two inner lifting rods (32) and a pair of lower slides (14) corresponding to the two outer lifting rods (35), and the bottom ends of the two inner lifting rods (32) are rotatably connected to the two lower bases (13), and the rollers (38) at the bottom ends of the two outer lifting rods (35) are respectively abutted on the two lower slides (14).

6. The large-tonnage lifting platform according to claim 2, wherein, The top stand (2) includes a top plate (21), and the top surface of the top plate (21) is provided with a pair of guide rails (22) corresponding in parallel, and the bottom surface of the top plate (21) is provided with a pair of upper bases (23) corresponding to the two outer lifting rods (35) and a pair of upper slides (24) corresponding to the two inner lifting rods (32), and the top ends of the two outer lifting rods (35) are rotatably connected to the two upper bases (23), and the rollers (38) at the top ends of the two inner lifting rods (32) are respectively abutted on the two upper slides (24).

Images