Dual-system multi-connecting-rod pushing chain type lifting equipment

Abstract

Dual-system multi-connecting-rod pushing chain type lifting equipment belongs to the technical field of lifting equipment and comprises a top plate and a base, self-guiding multi-connecting-rod mechanisms are arranged between the inner surfaces of the four same side ends of the top plate and the base respectively, and the four self-guiding multi-connecting-rod mechanisms jointly form a square constraint structure; a pushing chain device is connected between the top plate and the base, the bottom of a chain box of the pushing chain device is fixedly connected with the middle of the upper surface of the base, and the chain box extends upwards in the vertical direction through a pushing chain output by a driving box and is fixedly connected with the middle of the lower surface of the top plate through a flange base. The rigid pushing chain system is used as a driving part and has the advantages of being high in speed, large in bearing capacity, high in precision, long in maintenance period and capable of achieving multi-point control, and the flexible connecting rod system and the rigid pushing chain system cooperate with each other, so that the equipment has the advantage of meshing type pushing chain rigid system driving and also has the advantage of multi-point control. And meanwhile, the device has the advantages of good stability, low initial height, large stroke, strong environmental adaptability, environment friendliness and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting equipment, and specifically relates to a dual-system multi-link push chain lifting equipment used in industrial occasions (such as aerospace assembly lines and medical equipment lifting platforms) that require high precision, anti-roll, low initial height and large stroke. Background Art

[0002] In the field of lifting equipment technology, most are currently driven by transmission methods such as hydraulic cylinders, screws, traditional chains, and belts. However, hydraulic transmission methods have disadvantages such as oil leakage and low precision, screw transmission methods are slow, and chain or belt transmission methods have disadvantages such as poor precision and large space occupation. There are also lifting equipment on the market that use push chains to drive, but most use a scissor fork structure. However, the scissor fork lifting platform is not stable enough. During use, it will shake or tilt, which is particularly obvious at maximum height or when the load is uneven. The support center of gravity will also shift during movement. When the traditional scissor fork mechanism has a stroke >1m, unilateral force can easily cause the platform to tilt ≥2°, and the hydraulic system leakage rate is >5% / year (Industry White Paper 2024). Summary of the Invention

[0003] The present invention discloses a dual-system multi-link push chain lifting equipment, which uses an engaged push chain rigid system as a driving component and has the advantages of high speed, large load capacity, high precision, long maintenance cycle and multi-point control. Through the mutual coordination of the multi-link flexible system and the engaged push chain rigid system, the equipment not only has the advantages of being driven by the engaged push chain rigid system, but also has the advantages of good stability, low initial height, large stroke, strong environmental adaptability and green environmental protection.

[0004] To achieve the above object, the technical solution of the present invention is: A dual-system multi-link push chain lifting equipment, including a top plate and a base relative to each other, both of which are rectangular structures, and self-guided multi-link mechanisms are respectively provided between the inner surfaces of the four same-side ends of the top plate and the base. Among the four self-guided multi-link mechanisms, a group relative to each other in the front and rear is arranged along the X-axis and limits the horizontal displacement or tilt of the top plate relative to the base along the Y-axis while providing longitudinal expansion and contraction, and a group relative to each other in the left and right is arranged along the Y-axis and limits the horizontal displacement or tilt of the top plate relative to the base along the X-axis while providing longitudinal expansion and contraction. The four self-guided multi-link mechanisms together constitute a constraint structure that is in the shape of a U when viewed from above; a push chain device is connected between the top plate and the base, and the bottom of the chain box of the push chain device is fixedly connected to the middle of the upper surface of the base, and the chain box extends vertically upward through the push chain output by the drive box and is fixedly connected to the middle of the lower surface of the top plate through the flange seat.

[0005] Preferably, the four self-guided multi-link mechanisms have the same structure, each including a transversely arranged guide rod and telescopic parts provided at both ends of the guide rod and slidingly engaged with the guide rod. The upper and lower ends of the telescopic parts are hinged to the inner surfaces of the top plate and the base, respectively. The eight telescopic parts are arranged in groups of two on both sides of the upper and lower opposite corners of the top plate and the base. During the lifting process of the top plate, the connection positions of the upper and lower ends of the telescopic parts and the top plate and the base remain unchanged, and are used to ensure that the longitudinal axis of the center of gravity of the top plate does not shift.

[0006] Preferably, the telescopic member is a diamond-shaped multi-link, and the two ends of the guide rod respectively pass through the inner end of the diamond-shaped multi-link on the same side and slide with the inner end, and the outer ends of the diamond-shaped multi-link are respectively fixedly connected to the end of the guide rod, and the upper and lower ends of the diamond-shaped multi-link are respectively hinged to the lower surface of the top plate and the upper surface of the base. The hinge seat includes a horizontal plate fixedly connected to the top plate or the base, and the inner surface of the horizontal plate is fixedly connected to a limiting block along the X-axis or Y-axis. The upper and lower ends of the two diamond-shaped multi-links of the self-guided multi-link mechanism arranged along the X-axis are respectively hinged to the limit blocks arranged along the X-axis on the top plate and the base through a first hinge axis, and the limit blocks arranged along the X-axis are provided with a first limit hole along the Y-axis. The first hinge axis is rotatably connected to the first limiting hole; a first limiting plate is respectively provided at both ends of the first hinge axis, and with the cooperation of the first hinge axis, the first limiting plate and the first limiting hole, the top plate is restricted from horizontal displacement or tilting along the Y-axis; similarly, the upper and lower ends of the two rhombus multi-link mechanisms of the self-guided multi-link mechanism arranged along the Y-axis are respectively hinged to the top plate and the limiting blocks arranged along the Y-axis on the base through the second hinge axis, and the limiting blocks arranged along the Y-axis are provided with a second limiting hole along the X-axis, and the second hinge axis is rotatably connected to the second limiting hole, and a second limiting plate is respectively provided at both ends of the second hinge axis, and with the cooperation of the second hinge axis, the second limiting hole and the second limiting plate, the top plate is restricted from horizontal displacement or tilting along the X-axis.

[0007] Preferably, the diamond multi-link includes a fixed block arranged on the outside relative to the guide rod, a guide block arranged on the inside, a first rotating arm and a second rotating arm arranged on the upper and lower sides of the fixed block and the guide block, a linear bearing is provided in the guide block and is slidably connected to the guide rod through the linear bearing, and the end of the guide rod passes through the linear bearing and is fixedly connected to the inner surface of the fixed block; the upper and lower ends of the fixed block are respectively provided with a first axial hole, and the upper and lower ends of the guide block are respectively provided with a second axial hole, one end of the first rotating arm is hinged to the second axial hole through a third hinge axis, and the other end is hinged to the corresponding first limiting hole or second limiting hole through the first hinge axis or the second hinge axis; a third axial hole is opened in the middle of the first rotating arm, one end of the second rotating arm is hinged to the third axial hole through a fourth hinge axis, and the other end is hinged to the first axial hole through a fifth hinge axis, and third limiting plates are respectively provided at both ends of the third hinge axis, the fourth hinge axis, and the fifth hinge axis are respectively arranged parallel to the first hinge axis or the second hinge axis.

[0008] Preferably, the guide rod is arranged horizontally, and the diamond-shaped multi-links at both ends of the guide rod are arranged symmetrically. Under the constraint of the U-shaped constraint structure, the top plate is lifted and lowered vertically. Furthermore, under the guidance and limitation of the guide rod, the diamond-shaped multi-links at both ends of the guide rod move synchronously; when the diamond-shaped multi-links on both sides of the guide rod move synchronously, the longitudinal axis of the center of gravity of the top plate remains unchanged.

[0009] Preferably, the upper surface of the base is arranged in a rectangular shape with four longitudinally arranged limit rods, and the top of the limit rods is provided with a support plate, and the top height of each support plate is consistent. The limit rods are used to limit the minimum height of the top plate and provide support for the top plate when the top plate descends to the minimum height.

[0010] Preferably, a detection device mounting plate is fixedly provided on the base, and a detection component for detecting the height of the top plate is provided on the detection device mounting plate.

[0011] The beneficial effects of the dual-system multi-link push chain lifting equipment of the present invention are: (1) Synergistic stabilization effect of the flexible multi-link system and the rigid push chain system: Through the direct drive coupling of the flexible multi-link system composed of four sets of self-guided multi-link mechanisms arranged in an orthogonal space-shaped structure and the rigid push chain system, the single-point force deficiency of the traditional scissor fork mechanism is overcome. Measured data: Under the working conditions of 1.5m stroke and 2 tons load, the platform inclination is ≤0.5° (industry average ≥2°), and the anti-roll capability is improved by 400%. Its core mechanism is as follows: the double-chain meshing push chain of the rigid push chain system provides central lifting force, eliminating the eccentric load deformation of the hydraulic and screw rods; in the flexible multi-link system, four sets of self-guided multi-link mechanisms are arranged in a mutually orthogonal shape, forming an XY bidirectional constraint, which suppresses the displacement of the top plate's five degrees of freedom (X-axis movement freedom, X-axis rotation freedom, Y-axis movement freedom, Y-axis rotation freedom, and Z-axis rotation freedom); the support points of the flexible multi-link system are distributed at the four corners of the equipment, so that the center of gravity of the top plate is always within the support range of the flexible multi-link system during movement, greatly enhancing the lifting stability of the lifting equipment. In the scissor fork structure, the support center of gravity will shift with the movement of the scissors fork, causing the lifting body (top plate) to be in a cantilever state when lifted to a high position, with extremely poor stability.

[0012] (2) High stroke characteristics with low space occupation: The folding configuration of the multi-link mechanism reduces the initial height to 200mm (conventional hydraulic platforms ≥500mm), while the stroke can reach 1.2m. Key innovations: The guide rods are arranged horizontally, utilizing the dead space between the top plate and the base; the first rotating arm, the second rotating arm, and the guide rods are hinged to form a self-stabilizing triangle, which provides stronger support performance; self-stabilizing triangles are formed between the second rotating arm and the base, and between the second rotating arm and the top plate, respectively, to enhance the safety and stability of the return position; the horizontal stroke to vertical stroke ratio of the self-guided link mechanism is: △S:△H=1:2, achieving stroke amplification.

[0013] (3) Original dual power transmission path: Rigid path: The rigid push chain system directly drives the lifting body (top plate), with a power transmission efficiency of ≥87%; Flexible path: The flexible connecting rod system transmits loads in a mutually orthogonal distributed manner in the X and Y directions, constraining the five degrees of freedom and reducing single-point stress by 40% (the flexible connecting rod systems are mutually orthogonal and vertically distributed, and act together when subjected to force, generating reaction forces in the X and Y directions at the same time. The reaction forces in the two directions act simultaneously to generate a resultant force and achieve force balance. Compared with the case of a single system, the comprehensive calculation shows that the single-point stress in the X and Y directions is reduced by 40%). The dual systems work together to enable the system to have a load-bearing capacity of 5 tons, which is 30% lighter than the hydraulic system of the same level.

[0014] (4) Fully closed-loop intelligent control: integrated servo drive and sensor control: mechanical hard limit of the limit bracket (limit rod) + soft limit of the detection component; real-time adjustment of the chain speed based on platform inclination feedback to achieve no-load ±0.1mm and full-load ±0.5mm positioning accuracy (industry standard ±2mm).

[0015] (5) Zero-maintenance green power system: The rigid push chain system uses fully sealed bearings with a lubrication cycle of >10,000 hours (the hydraulic system requires 500 hours of maintenance), fundamentally eliminating the risk of leakage. Environmental tolerance verification: The chain link meshing error is less than 0.05mm under -40℃~85℃ working conditions; the flexible link system uses self-lubricating bushings at all joints, which can achieve maintenance-free operation; the drive mode is converted to electric drive, the system structure is simple, and the energy is cleaner. Compared with hydraulic and pneumatic drive modes, carbon emissions are reduced by ≥300% and energy savings are ≥800%.

[0016] (6) Fast operation speed and long service life: It adopts a rigid push chain system for driving, and the maximum operation speed can reach 11m / min, which is 250% faster than the scissor fork structure. The rigid push chain system acts directly on the lifting body, and the load force on the orthogonal distribution multi-link mechanism is greatly reduced, which greatly improves the service life. The service life of the rigid push chain system is 4000km, and the service life of the flexible link system is 5000km (the main life of the flexible link system is affected by the linear bearing, and the standard service life of the linear bearing is not less than 5000km. In this invention, the load mainly acts on the rigid push chain system, so the linear bearing is used under light load conditions and has a longer service life.) Under the working conditions of 1.5m stroke and 2 tons load, the single reciprocating stroke is 3m, and the theoretical service life is 1.3 million times. The test verification shows that it can achieve 1 million reciprocating motions, and the service life is increased by 1000%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : A front view of a dual-system multi-link push chain lifting equipment of the present invention (the dotted line part shows the posture of the device returning to the bottom).

[0018] Figure 2 : An isometric structural diagram of a dual-system multi-link push chain lifting equipment of the present invention.

[0019] Figure 3 : The structural diagram of the base of the present invention.

[0020] Figure 4 : A front view structural diagram of the self-steering multi-link mechanism of the present invention.

[0021] Figure 5 : A three-dimensional structural diagram of the self-steering multi-link mechanism of the present invention.

[0022] Figure 6: A three-dimensional structural diagram of the connection between the second rotating arm and the fixed block of the present invention.

[0023] Figure 7 : A three-dimensional structural diagram of the connection between the first rotating arm and the sliding block of the present invention.

[0024] Figure 8 : Isometric structural diagram of the guide rod of the present invention.

[0025] Figure 9 : The structural diagram of the meshing push chain device of the present invention.

[0026] Figure 10 : The present invention discloses a lifting state of a dual-system multi-link push chain lifting equipment.

[0027] Figure 11 : The present invention discloses a return state of a dual-system multi-link push chain lifting equipment.

[0028] Figure 12 : A top view of the distribution layout of the self-steering multi-link mechanism of the present invention.

[0029] In the figure: 1. base; 101. base body; 102. limit rod; 103. support plate; 104. detection device mounting plate; 105. detection component; 2. top plate; 3. self-guided multi-link mechanism; 301. fixed block; 302. second rotating arm; 303. fifth articulated shaft; 304. guide block; 305. first rotating arm; 306. fourth articulated shaft; 307. articulated shaft limit plate; 308. articulated seat; 309. guide rod; 310. guide rod fixing seat; 311. linear bearing; 312. limit block; 313. first articulated shaft; 314. first limit plate; 4. meshing push chain device; 401. push chain; 402. drive box; 403. chain box. DETAILED DESCRIPTION

[0030] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0031] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0032] In the initial embodiment, the present invention is a dual-system multi-link push chain lifting equipment, such as Figure 1-12As shown, it includes a top plate 2 and a base 1 facing each other. The top plate 2 and the base 1 are both rectangular structures. A self-guided multi-link mechanism 3 is provided between the inner surfaces of the four same-side ends of the top plate 2 and the base 1. Among the four self-guided multi-link mechanisms 3, Figure 2 、 12 As shown, the front and rear opposite groups are arranged along the X-axis and limit the horizontal displacement or tilt of the top plate 2 relative to the base 1 along the Y-axis while providing longitudinal expansion and contraction. The left and right opposite groups are arranged along the Y-axis and limit the horizontal displacement or tilt of the top plate 2 relative to the base 1 along the X-axis while providing longitudinal expansion and contraction. The four self-guided multi-link mechanisms together constitute a U-shaped constraint structure (as shown in FIG. Figure 12 As shown); Figure 1 、 9 As shown, an engaging push chain device 4 is connected between the top plate 2 and the base 1. The bottom of the chain box 403 of the engaging push chain device 4 is fixedly connected to the middle of the upper surface of the base 1. The chain box 403 extends vertically upward through the push chain 401 output by the drive box 402 and is fixedly connected to the middle of the lower surface of the top plate 2 through the flange seat.

[0033] In this embodiment, the dual system refers to a rigid push chain system consisting of an intermeshing push chain device and a flexible link system consisting of four self-guided multi-link mechanisms. The rigid push chain system provides power support for the top plate's lifting and lowering, while the flexible multi-link system ensures the top plate maintains vertical lifting and a constant center of gravity. The intermeshing push chain device 4 is conventional and typically includes a chain box and a drive box. Two chains are coiled around guide rails within the chain box. A push chain output channel is provided at the top of the drive box. A sprocket is provided within the drive box that engages one of the chains. The sprocket's axle is connected to a servo motor. The servo motor drives the sprocket to rotate, which in turn drives the chain to move. The engaged push chain is then output along the upper port of the drive box, driving the top plate's lifting and lowering. For detailed structural information on the push chain device not described in this invention, please refer to the prior art. Although the lifting platforms in the prior art are also equipped with flexible links of the scissor fork type, most of these flexible links cannot keep the center of gravity of the top plate unchanged, and it is even more difficult to lift the top plate vertically (without horizontal displacement or tilting). As a result, the lifting accuracy of the top plate is low, the error is large, and there are safety hazards. It cannot be used in industrial occasions that require high precision, anti-roll, low initial height, and large stroke. The present invention has greatly improved the accuracy of the vertical lifting of the top plate, and the longitudinal axis of the center of gravity of the top plate can be kept almost unchanged during the entire process, and thus can be applied to various industrial occasions requiring precise lifting.

[0034] In a further embodiment, Figure 2 、 4As shown, the four self-guided multi-link mechanisms 3 have the same structure, including a transversely arranged guide rod 309 and telescopic members provided at both ends of the guide rod 309 and slidingly cooperating with the guide rod 309. The upper and lower ends of the telescopic members are respectively hinged to the inner surface of the top plate 2 and the base 1, as shown in FIG. Figure 10 、 12 As shown, eight telescopic members are arranged in pairs on either side of the upper and lower opposing corners of the top plate 2 and the base 1. During the raising and lowering of the top plate 2, the upper and lower ends of the telescopic members remain connected to the top plate 2 and the base 1, thereby ensuring that the longitudinal axis of the center of gravity of the top plate 2 does not shift. Maintaining this center of gravity during the lifting process effectively improves the vertical lifting accuracy of the lifting platform and ensures its safety.

[0035] In a further embodiment, Figure 4 、 5 As shown, the telescopic member is a diamond-shaped multi-link, and the two ends of the guide rod 309 respectively pass through the inner end of the diamond-shaped multi-link on the same side and slide with the inner end, and the outer ends of the diamond-shaped multi-link are respectively fixedly connected to the end of the guide rod, and the upper and lower ends of the diamond-shaped multi-link are respectively hinged to the hinge seat 308 preset on the lower surface of the top plate 2 and the upper surface of the base 1. The hinge seat 308 includes a horizontal plate fixedly connected to the top plate 2 or the base 1, and the inner surface of the horizontal plate is fixedly connected to the limit block 312 along the X-axis or Y-axis, as shown in FIG. Figure 2 As shown, the upper and lower ends of the two diamond-shaped multi-links of the self-guided multi-link mechanism 3 arranged along the X-axis are respectively hinged to the limit blocks arranged along the X-axis on the top plate 2 and the base 1 through the first hinge shaft 313, and the limit blocks arranged along the X-axis are provided with a first limit hole along the Y-axis (as shown in FIG. Figure 5 As shown), the first hinge shaft 313 is rotatably connected to the first limiting hole; a first limiting plate 314 is respectively provided at both ends of the first hinge shaft (limiting the axial movement of the self-guided multi-link mechanism along the first hinge shaft). With the cooperation of the first hinge shaft 313, the first limiting plate 314 and the first limiting hole, the top plate 2 is limited to horizontal displacement or tilt along the Y axis; similarly, the upper and lower ends of the two diamond-shaped multi-links of the self-guided multi-link mechanism 3 arranged along the Y axis are respectively hinged to the limit blocks arranged along the Y axis on the top plate 2 and the base 1 through the second hinge shaft, and the limit blocks arranged along the Y axis are provided with a second limiting hole along the X axis. The second hinge shaft is rotatably connected to the second limiting hole, and a second limiting plate is respectively provided at both ends of the second hinge shaft. With the cooperation of the second hinge shaft, the second limiting hole and the second limiting plate, the top plate is limited to horizontal displacement or tilt along the X axis.

[0036] In this embodiment, a first or second limiting plate is provided at both ends of the first or second hinge shaft, respectively, thereby limiting the axial movement of the first or second hinge shaft, and further limiting the axial movement of the self-guided multi-link mechanism along the first or second hinge shaft; thereby preventing the top plate from moving in the horizontal direction or tilting.

[0037] In a further embodiment, Figure 4 、 5 As shown, the diamond-shaped multi-link includes a fixed block 301 arranged on the outside relative to the guide rod 309, a guide block 304 arranged on the inside, a first rotating arm 305 and a second rotating arm 302 arranged on the upper and lower sides of the fixed block 301 and the guide block 304, a linear bearing is provided in the guide block 304, and is slidably connected to the guide rod 309 through the linear bearing, and the end of the guide rod 309 passes through the linear bearing and is fixedly connected to the inner surface of the fixed block 301; the upper and lower ends of the fixed block 301 are respectively provided with a first shaft hole, the upper and lower ends of the guide block 304 are respectively provided with a second shaft hole, and the first rotating arm 305 and the second rotating arm 302 are provided on the upper and lower sides of the fixed block 301 and the guide block 304 are respectively provided with a second shaft hole. One end of 305 is hinged to the second axis hole through the third hinge axis, and the other end is hinged to the corresponding first limiting hole or second limiting hole through the first hinge axis 313 or the second hinge axis; a third axis hole is opened in the middle of the first rotating arm 305, one end of the second rotating arm 302 is hinged to the third axis hole through the fourth hinge axis 306, and the other end is hinged to the first axis hole through the fifth hinge axis 303, and third limiting plates are respectively provided at both ends of the third hinge axis, the fourth hinge axis and the fifth hinge axis, and the third hinge axis, the fourth hinge axis and the fifth hinge axis are respectively arranged parallel to the first hinge axis or the second hinge axis.

[0038] In a further embodiment, Figure 4 、 5 As shown, the guide rod 309 is arranged horizontally, and the diamond-shaped multi-links at both ends of the guide rod 309 are arranged symmetrically. Under the constraint of the U-shaped constraint structure, the top plate 2 is lifted and lowered vertically. Furthermore, under the guidance and limitation of the guide rod 309, the diamond-shaped multi-links at both ends of the guide rod move synchronously; when the diamond-shaped multi-links on both sides of the guide rod move synchronously, the longitudinal axis of the center of gravity of the top plate remains unchanged (the "remaining unchanged" here in the present invention means remaining unchanged within a certain very small error, not absolutely remaining unchanged, which is different due to the difference in processing accuracy between the hinge shaft and the limiting hole or the shaft hole).

[0039] In a further embodiment, Figure 3As shown, the upper surface of the base 1 is arranged in a rectangular shape with four longitudinally arranged limit rods 102, and the top of the limit rods 102 is provided with a support plate 103, and the top of each support plate has the same height. The limit rods 102 are used to limit the minimum height of the top plate 2 and provide support for the top plate 2 when the top plate 2 drops to the minimum height, so as to prevent the top plate 2 from falling too low, and at the same time avoid damage to the push chain due to long-term reliance on the push chain support when the top plate is not raised or lowered.

[0040] like Figure 3 As shown, a detection device mounting plate 104 is fixedly mounted on the base 1, and a detection assembly for detecting the height of the top plate 2 is mounted on the detection device mounting plate 104. This detection assembly can be a vertically mounted laser ranging sensor to detect the height of the top plate in real time, and then the device controller controls the height of the top plate based on the detection signal (the controller controls the servo motor). The detection assembly can also be a non-contact proximity switch to detect whether the top plate has descended to a near-lowest position, thereby controlling the servo motor to slow down and prevent a hard collision between the top plate and the support plate.

[0041] Working principle of the present invention: 1. The U-shaped constraint structure composed of self-guided multi-link mechanisms set on four sides can constrain the top plate to avoid horizontal displacement in all directions or tilting at all angles.

[0042] 2. Each set of self-guided multi-link mechanisms has diamond-shaped multi-links symmetrically arranged about the guide rod. During the lifting process of the top plate, the eight sets of diamond-shaped multi-links move synchronously and the connection positions of the upper and lower ends with the top plate or base remain unchanged, thereby ensuring that the longitudinal axis of the top plate's center of gravity remains unchanged.

[0043] 3. The rigid push chain system composed of the meshing push chain device and the flexible link system composed of 4 self-guided multi-link mechanisms cooperate with each other to achieve high-precision, stable, high-speed, high-load, green and low-carbon operation of the lifting platform.

[0044] 4. When the double-chain meshing push chain of the rigid push chain system is extended, it provides rigid lifting power for the device. The top plate is lifted under the coordinated action of the rigid push chain system and the flexible connecting rod system; the flexible connecting rod system converts vertical displacement into horizontal displacement and provides stable flexible support for the lifting body.

[0045] 5. When the double-chain meshing push chain of the rigid push chain system contracts, it provides rigid return power for the device. The top plate returns under the coordinated action of the rigid push chain system and the flexible connecting rod system; the flexible connecting rod system converts vertical displacement into horizontal displacement and provides stable flexible support for the lifting body.

Claims

1. A dual-system multi-link push chain lifting equipment, characterized by: It includes a top plate and a base relative to each other, both of which are rectangular structures. Self-guided multi-link mechanisms are respectively provided between the inner surfaces of the four same-side ends of the top plate and the base. Among the four self-guided multi-link mechanisms, a group relative to each other in the front and rear is arranged along the X-axis and limits the horizontal displacement or tilt of the top plate relative to the base along the Y-axis while providing longitudinal expansion and contraction. A group relative to each other in the left and right is arranged along the Y-axis and limits the horizontal displacement or tilt of the top plate relative to the base along the X-axis while providing longitudinal expansion and contraction. The four self-guided multi-link mechanisms together constitute a constraint structure that is in the shape of a U when viewed from above. A push chain device is connected between the top plate and the base. The bottom of the chain box of the push chain device is fixedly connected to the middle of the upper surface of the base. The chain box extends vertically upward through the push chain output by the drive box and is fixedly connected to the middle of the lower surface of the top plate through the flange seat.

2. The dual-system multi-link push chain lifting equipment according to claim 1, characterized in that: The four self-guided multi-link mechanisms have the same structure, all of which include a transversely arranged guide rod and telescopic parts arranged at both ends of the guide rod and slidingly cooperated with the guide rod. The upper and lower ends of the telescopic parts are hinged to the inner surfaces of the top plate and the base respectively. The eight telescopic parts are arranged in groups of two on both sides of the upper and lower opposite corners of the top plate and the base. During the lifting process of the top plate, the connection positions of the upper and lower ends of the telescopic parts and the top plate and the base remain unchanged, and are used to ensure that the longitudinal axis of the center of gravity of the top plate does not shift.

3. The dual-system multi-link push chain lifting equipment according to claim 2, characterized in that: The telescopic member is a diamond-shaped multi-link, and the two ends of the guide rod respectively pass through the inner end of the diamond-shaped multi-link on the same side and slide with the inner end, and the outer ends of the diamond-shaped multi-link are respectively fixedly connected to the end of the guide rod, and the upper and lower ends of the diamond-shaped multi-link are respectively hinged to the lower surface of the top plate and the upper surface of the base. The hinge seat includes a horizontal plate fixedly connected to the top plate or the base, and the inner surface of the horizontal plate is fixedly connected to a limited block along the X-axis or Y-axis. The upper and lower ends of the two diamond-shaped multi-links of the self-guided multi-link mechanism arranged along the X-axis are respectively hinged to the limit blocks arranged along the X-axis on the top plate and the base through a first hinge axis. The limit blocks arranged along the X-axis are provided with a first limit hole along the Y-axis. A hinge shaft is rotatably connected to the first limit hole; a first limit plate is respectively provided at both ends of the first hinge shaft, and with the cooperation of the first hinge shaft, the first limit plate and the first limit hole, the top plate is restricted from horizontal displacement or tilting along the Y-axis; similarly, the upper and lower ends of the two diamond-shaped multi-links of the self-guided multi-link mechanism arranged along the Y-axis are respectively hinged to the limit blocks arranged along the Y-axis on the top plate and the base through the second hinge shaft, and the limit blocks arranged along the Y-axis are provided with a second limit hole along the X-axis, and the second hinge shaft is rotatably connected to the second limit hole, and a second limit plate is respectively provided at both ends of the second hinge shaft, and with the cooperation of the second hinge shaft, the second limit hole and the second limit plate, the top plate is restricted from horizontal displacement or tilting along the X-axis.

4. The dual-system multi-link push chain lifting equipment according to claim 3, characterized in that: The diamond multi-link includes a fixed block arranged on the outside relative to the guide rod, a guide block arranged on the inside, a first rotating arm and a second rotating arm arranged on the upper and lower sides of the fixed block and the guide block, a linear bearing is provided in the guide block and is slidably connected to the guide rod through the linear bearing, and the end of the guide rod passes through the linear bearing and is fixedly connected to the inner surface of the fixed block; the upper and lower ends of the fixed block are respectively provided with a first axial hole, and the upper and lower ends of the guide block are respectively provided with a second axial hole, one end of the first rotating arm is hinged to the second axial hole through a third hinge axis, and the other end is hinged to the corresponding first limiting hole or second limiting hole through the first hinge axis or the second hinge axis; a third axial hole is opened in the middle of the first rotating arm, one end of the second rotating arm is hinged to the third axial hole through a fourth hinge axis, and the other end is hinged to the first axial hole through a fifth hinge axis, and third limiting plates are respectively provided at both ends of the third hinge axis, the fourth hinge axis, and the fifth hinge axis are respectively arranged parallel to the first hinge axis or the second hinge axis.

5. The dual-system multi-link push chain lifting equipment according to claim 4, characterized in that: The guide rod is arranged horizontally, and the diamond-shaped multi-links at both ends of the guide rod are arranged symmetrically. Under the constraint of the U-shaped constraint structure, the top plate is lifted and lowered vertically. Furthermore, under the guidance and limitation of the guide rod, the diamond-shaped multi-links at both ends of the guide rod move synchronously; when the diamond-shaped multi-links on both sides of the guide rod move synchronously, the longitudinal axis of the center of gravity of the top plate remains unchanged.

6. The dual-system multi-link push chain lifting equipment according to claim 5, characterized in that: The upper surface of the base is arranged in a rectangular shape with four longitudinally arranged limit rods, and the top of the limit rods is provided with a support plate. The top of each support plate has the same height. The limit rods are used to limit the minimum height of the top plate and provide support for the top plate when the top plate descends to the minimum height.

7. The dual-system multi-link push chain lifting equipment according to claim 6, characterized in that: A detection device mounting plate is fixedly provided on the base, and a detection component for detecting the height of the top plate is provided on the detection device mounting plate.

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