Backpack rack assembly and lift device

Abstract

The utility model relates to the technical field of lift, provide a backpack frame subassembly and lifting equipment, the frame body in backpack frame subassembly has support body and carrier, first drive arrangement and second drive arrangement are along the height direction interval arrangement of support body, first guide mechanism includes at least two first adjustable guide wheel groups, every two first adjustable guide wheel groups are symmetrically established on the support body, and first adjustable guide wheel group is adjacent first drive arrangement setting, second guide mechanism includes at least two second adjustable guide wheel groups, every two second adjustable guide wheel groups are symmetrically established on the support body, and second adjustable guide wheel group is adjacent second drive arrangement setting, first adjustable guide wheel group and second adjustable guide wheel group jointly limit one for the guide structure and pass guide channel, and first adjustable guide wheel group and second adjustable guide wheel group are suitable for adjusting along the width direction of frame body to make the width of guide channel and the width of guide structure match.

Description

Technical Field

[0001] This utility model relates to the field of lifting technology, and in particular to a backpack rack assembly and lifting device. Background Technology

[0002] Rack and pinion lifts, as vertical transportation equipment, are widely used in wind turbine towers, construction sites, bridges, and other scenarios for lifting personnel and equipment. The operational stability and safety of the lift are crucial, and the reliability of the guide wheel assembly on the backpack frame plays a vital role in this process.

[0003] In existing technologies, lifting platforms typically use vertical beams on both sides of a ladder or racks installed on the vertical beams as guide structures. These guide structures are usually composed of multiple standard sections connected together. Due to manufacturing and on-site installation errors, steps inevitably exist at the joints between sections. When the guide wheels on the backpack frame assembly pass over these steps, one side of the guide wheel is compressed, causing an excessive gap between the opposite guide wheel and the guide structure, resulting in a momentary loss of guiding function, violent shaking, and even functional failure. Summary of the Invention

[0004] This utility model provides a backpack frame assembly and lifting device to solve the above-mentioned technical defects in the prior art. It can eliminate guide gaps caused by joint steps in the guide structure, manufacturing and installation tolerances, or long-term wear, and effectively prevent the car from shaking, uneven loading, and impact during operation.

[0005] The first aspect of this utility model provides a backpack frame assembly, comprising: The frame itself has a support structure and a load-bearing structure; The first driving device and the second driving device are spaced apart along the height direction of the support body. The first guide mechanism includes at least two first adjustable guide wheel sets, each pair of first adjustable guide wheel sets being symmetrically arranged on the support body, and the first adjustable guide wheel sets being arranged adjacent to the first drive device; The second guide mechanism includes at least two second adjustable guide wheel sets, each pair of second adjustable guide wheel sets being symmetrically arranged on the support body, and the second adjustable guide wheel sets being arranged adjacent to the second drive device; The first adjustable guide wheel set and the second adjustable guide wheel set together define a guide channel for the guide structure to pass through. The first adjustable guide wheel set and the second adjustable guide wheel set are adapted to be adjusted along the width direction of the frame body so that the width of the guide channel matches the width of the guide structure.

[0006] According to the backpack frame assembly provided by this utility model, the first adjustable guide wheel assembly includes: The first support has one end fixed to the support body and the other end suspended in the air; The main body of the first guide wheel is located at one of the suspended ends of the first support; The first adjustment mechanism is connected to the first guide wheel body and the first support respectively, and is used to adjust the position of the first guide wheel body relative to the first support.

[0007] According to the backpack frame assembly provided by this utility model, the second adjustable guide wheel assembly includes: The second support is embedded in the support body; The second guide wheel body is located on the second support and together with the first guide wheel body, defines the guide channel. The second adjustment mechanism is connected to the second guide wheel body and the second support respectively, and is used to adjust the position of the second guide wheel body relative to the second support.

[0008] According to the backpack frame assembly provided by this utility model, the first driving device and the second driving device each include: A drive bracket is fixedly mounted on the support body; The driving component is fixedly mounted on the driving bracket; A drive gear, rotatably mounted on the drive bracket and connected to the output shaft of the drive member, is used to mesh with a rack on the guide structure; and A back pressure roller assembly is provided, which is spaced apart from the drive gear and is used to contact the side of the guide structure opposite to the rack, so as to ensure the meshing of the drive gear and the rack.

[0009] According to the backpack frame assembly provided by this utility model, the meshing line of the drive gear and the rack coincides with the center line of the support.

[0010] According to the backpack frame assembly provided by this utility model, the first driving device and the second driving device are arranged opposite to each other; The first adjustable guide wheel group is disposed adjacent to the drive gear and the back pressure wheel group in the first drive device; the second adjustable guide wheel group is disposed adjacent to the drive gear and the back pressure wheel group in the second drive device.

[0011] According to the backpack frame assembly provided by this utility model, the first guide mechanism and / or the second guide mechanism further include at least one side guide wheel; The side guide wheel in the first guiding mechanism is disposed on the first adjustable guide wheel group, and the side guide wheel in the second guiding mechanism is disposed on the carrier. Each of the side guide wheels is used to contact the side of the guide structure to constrain the backpack frame assembly to move along the length of the frame body.

[0012] According to the backpack frame assembly provided by this utility model, the first guide mechanism and / or the second guide mechanism further includes at least one fixed guide wheel; The fixed guide wheel in the first guide mechanism is disposed on the support body and located opposite the first adjustable guide wheel group; the fixed guide wheel in the second guide mechanism is disposed on the carrier body and located opposite the second adjustable guide wheel group. Each of the fixed guide wheels is used to contact the side of the guide structure to constrain the backpack frame assembly to move along the width direction of the frame body.

[0013] According to the backpack frame assembly provided by this utility model, the first guide mechanism and / or the second guide mechanism further include an anti-slip limiting member; A gap is reserved between the anti-detachment limiting component and the guide structure to prevent the backpack frame assembly from separating from the guide structure when the adjustable guide wheel group and the fixed guide wheel fail to constrain the guide structure.

[0014] A second aspect of this utility model provides a lifting device, including a guide structure, a car, and a backpack rack assembly as described in any one of the above. The car is mounted on the support and load-bearing body of the backpack frame assembly; The backpack frame assembly engages with the rack on the guide structure and is guided by the guide structure.

[0015] The backpack frame assembly provided by this utility model features at least two first adjustable guide wheel sets arranged symmetrically on the support body near the first drive device; and at least two second adjustable guide wheel sets arranged symmetrically on the support body near the second drive device. The first and second adjustable guide wheel sets together define a guide channel for the guide structure to pass through. The first and second adjustable guide wheel sets are adapted to be adjusted along the width direction of the frame body so that the width of the guide channel matches the width of the guide structure.

[0016] This design, with adjustable guide wheel sets at both ends of the backpack frame support and on opposite sides of the guide structure, creates a stable constraint structure for the guide structure. Furthermore, the adjustable guide wheel sets allow for width adjustment of the guide channel, enabling on-site adjustments based on the actual dimensions of the guide structure until all guide wheel sets achieve a seamless, tight fit with the guide structure. This design completely eliminates guide clearances caused by joint steps, manufacturing and installation tolerances, or long-term wear, effectively preventing swaying, uneven loading, and impacts on the car during operation.

[0017] Furthermore, the stable guidance ensures that the drive gear and rack of the drive unit always maintain the correct meshing posture, resulting in uniform force distribution and avoiding stress concentration and abnormal wear, thereby improving the operational reliability and safety of the entire lifting system.

[0018] Meanwhile, due to the adjustable characteristics of the adjustable guide wheel assembly, the backpack frame assembly provided by this utility model can adapt to the dimensional deviations that may exist in the guide structure in different projects, exhibiting strong versatility and on-site adaptability. More importantly, after long-term operation of the lift, when the guide wheel assembly or guide structure experiences natural wear, maintenance personnel can easily readjust the guide wheel assembly to restore its fit with the guide structure. This compensatory design effectively offsets the negative impact of wear, extends the effective service life of the guide system and even the entire drive system, and reduces the total life-cycle maintenance cost.

[0019] The lifting device provided by this utility model, because it includes the above-mentioned backpack rack assembly, has all the advantages of the above-mentioned backpack rack assembly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model.

[0022] Figure 2 This is a front view of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model.

[0023] Figure 3 yes Figure 2 A cross-sectional view along line AA.

[0024] Figure 4 This is a top view of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model.

[0025] Figure 5 This is an installation diagram of the rack and pinion lifting system, including the frame body, the first guide mechanism, and the second guide mechanism, provided in this embodiment of the utility model.

[0026] Figure 6 This is one of the installation diagrams of the backpack frame assembly in the gear and rack lifting system provided in this utility model embodiment.

[0027] Figure 7 This is the second schematic diagram of the installation of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model.

[0028] Figure label: 200. Backpack frame assembly; 10. Frame body; 11. Support body; 12. Bearing body; 20. First drive device; 21. Drive bracket; 22. Drive component; 23. Drive gear; 24. Back pressure wheel assembly; 30. Second drive device; 40. First guide mechanism; 41. First adjustable guide wheel assembly; 411. First support; 412. First guide wheel body; 413. First adjustment mechanism; 42. Upper side guide wheel; 43. Upper fixed guide wheel; 44. Upper anti-slip limiting component; 50. Second guide mechanism; 51. Second adjustable guide wheel assembly; 511. Second support; 512. Second guide wheel body; 513. Second adjustment mechanism; 52. Lower side guide wheel; 53. Lower fixed guide wheel; 54. Lower anti-slip limiting component. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0031] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] In elevators, especially construction hoists or backpack-type hoists used in special environments, the backpack frame assembly typically moves up and down along a fixed guide structure (such as guide ladders or guide rails). To ensure smooth operation, guide wheels are installed on the backpack frame assembly, contacting both sides of the guide structure to constrain the movement trajectory of the backpack frame.

[0034] However, in practical applications, guide structures are often assembled from multiple standard sections. Due to manufacturing tolerances, insufficient on-site installation precision, or foundation settlement, slight misalignments inevitably exist between different sections, forming steps. Existing technology typically maintains a fixed, non-adjustable gap between the guide wheel assembly and the guide structure.

[0035] When the backpack rack assembly travels at high speed over these steps, the guide wheel on one side will be subjected to strong impact and compression. This compression will instantly increase the gap between the guide wheel on the opposite side and the guide structure, causing the guide wheel on the opposite side to momentarily disengage and lose its guiding function. This will cause violent shaking and vibration of the car, seriously affecting the ride comfort, and may even cause uneven force on the meshing between the drive gear and rack, generating impact loads, accelerating wear, and in extreme cases, may lead to drive system failure, posing a serious safety hazard.

[0036] Therefore, this utility model provides a backpack frame assembly to solve the technical problem in the prior art where the backpack frame assembly is unstable, causes violent shaking, and poses safety risks due to steps or tolerances in the guide structure.

[0037] Figure 1 This is a schematic diagram of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model. Figure 2 This is a front view of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model. Figure 3 yes Figure 2 A cross-sectional view along line AA. Figure 4 This is a top view of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model. Figure 5 This is an installation diagram of the rack and pinion lifting system, including the frame body, the first guide mechanism, and the second guide mechanism, provided in this embodiment of the utility model.

[0038] See Figures 1 to 5 This utility model embodiment provides a backpack frame assembly 200 applied to an elevator. The elevator also includes a guide structure 100 and a car 300. The backpack frame assembly 200 meshes with a rack 130 and is guided by the guide structure 100. The car 300 is mounted on the backpack frame assembly 200, and the bottom of the car 300 is flush with the bottom of the backpack frame assembly 200. The backpack frame assembly 200 is a drive system consisting of a frame body 10, a drive device (including a motor, a reducer, and a drive gear 23) mounted on the frame body 10, and a guide mechanism.

[0039] Backpack frame assembly 200 includes frame body 10, first drive device 20, second drive device 30, first guide mechanism 40 and second guide mechanism 50.

[0040] The frame body 10 serves as a load-bearing structure for mounting the first drive device 20, the second drive device 30, the first guide mechanism 40, and the second guide mechanism 50. The frame body 10 has a support body 11 and a load-bearing body 12, which are perpendicular to each other so that the frame body 10 is in an "L" shape.

[0041] The first driving device 20 and the second driving device 30 are spaced apart along the height direction of the support 11.

[0042] The first guide mechanism 40 includes at least two first adjustable guide wheel sets 41, that is, the first guide mechanism 40 includes at least two first adjustable guide wheel sets 41, and may also include four or more first adjustable guide wheel sets 41. Every two first adjustable guide wheel sets 41 are symmetrically arranged on the support body 11, that is, the first adjustable guide wheel sets 41 are arranged in pairs, and the first adjustable guide wheel sets 41 are arranged adjacent to the first drive device 20.

[0043] The second guide mechanism 50 includes at least two second adjustable guide wheel sets 51, that is, the second guide mechanism 50 includes at least two second adjustable guide wheel sets 51, and may also include four or more second adjustable guide wheel sets 51. Every two second adjustable guide wheel sets 51 are symmetrically arranged on the support body 11, that is, the first adjustable guide wheel sets 41 are arranged in pairs, and the second adjustable guide wheel sets 51 are arranged adjacent to the second drive device 30.

[0044] The first adjustable guide wheel group 41 and the second adjustable guide wheel group 51 together define a guide channel through which the guide structure 100 passes. The first adjustable guide wheel group 41 and the second adjustable guide wheel group 51 are adapted to be adjusted along the width direction of the frame body 10 so that the width of the guide channel matches the width of the guide structure 100.

[0045] It should be noted that the term "adjustable" in the first adjustable guide wheel assembly 41 and the second adjustable guide wheel assembly 51 should not be understood as a broad and uncertain concept. Rather, it should be understood in connection with the technical problem this invention aims to solve: the presence of steps on the guide structure 100 causing pressure on one side of the guide wheel assembly and easy disengagement of the opposite side. Therefore, the adjustable guide wheel assembly provided in this embodiment of the invention has a clear technical meaning: it allows the guide wheel assembly to be adjusted in position perpendicular to the side of the guide structure 100 (i.e., in the width direction of the frame body 10) to eliminate the initial gap between the guide wheel assembly and the guide structure 100.

[0046] This embodiment of the invention arranges two sets of drive devices at intervals along the height direction of the support body 11, and sets adjustable guide wheel sets at adjacent positions of the two sets of drive devices to form a long guide base distance. This arrangement enhances the ability to resist the overturning moment caused by the eccentric loading of the load-bearing component (carriage 300), which is the basis for ensuring the stable operation of the system.

[0047] The first adjustable guide wheel set 41 and the second adjustable guide wheel set 51 act on opposite sides of the guide structure 100 to form a clamp-like layout, creating a bidirectional constraint on the guide structure 100. The first adjustable guide wheel set 41 and the second adjustable guide wheel set 51 together define the guide channel. By adjusting the position of the adjustable guide wheel sets, the width of the guide channel is made approximately equal to the actual width of the guide structure 100, ensuring that all guide wheel sets on both sides maintain a constant and tight contact with the surface of the guide structure 100 in the initial state.

[0048] When the backpack frame assembly 200 is in operation and encounters a step on the guide structure 100: Because of the guide wheel assembly in the existing technology, when one guide wheel hits the step, the entire backpack frame will violently move laterally until the gap on the other side is completely eliminated, and then the guide wheel on the opposite side will come into contact with the guide rail. This process is the source of the shaking.

[0049] Regarding the backpack frame assembly 200 provided by this utility model: when one guide wheel encounters a protrusion of a step, the backpack frame cannot undergo violent lateral movement because the guide wheel on the opposite side always remains in contact. The impact force of the step is absorbed by the guide wheel assemblies on both sides, and buffered by the displacement change of the guide wheel assemblies themselves, so as to fundamentally avoid the phenomenon of one side being pressed and the other side being unsupported, and ensure that the guide wheel assemblies on both sides play an effective guiding role at all times.

[0050] It is understood that the backpack frame assembly 200 provided in this embodiment of the present invention comprises at least two first adjustable guide wheel sets 41 arranged symmetrically on the support body 11 near the first drive device 20; and at least two second adjustable guide wheel sets 51 arranged symmetrically on the support body 11 near the second drive device 30. The first adjustable guide wheel sets 41 and the second adjustable guide wheel sets 51 together define a guide channel for the guide structure 100 to pass through. The first adjustable guide wheel sets 41 and the second adjustable guide wheel sets 51 are adapted to be adjusted along the width direction of the frame body 10 so that the width of the guide channel matches the width of the guide structure 100.

[0051] This configuration, with adjustable guide wheel sets installed at both ends of the backpack frame support 11 and on opposite sides of the guide structure 100, creates a stable constraint structure for the guide structure 100. Furthermore, the adjustable guide wheel sets allow for width adjustment of the guide channel, enabling on-site adjustments based on the actual dimensions of the guide structure 100 until all guide wheel sets achieve a seamless, tight fit with the guide structure 100. This design completely eliminates guide clearances caused by joint steps, manufacturing or installation tolerances, or long-term wear of the guide structure 100, effectively preventing swaying, uneven loading, and impacts of the car 300 during operation.

[0052] Meanwhile, due to the adjustable characteristics of the adjustable guide wheel assembly, the backpack frame assembly 200 provided by this utility model can adapt to the dimensional deviations that may exist in the guide structure 100 in different projects, exhibiting strong versatility and on-site adaptability. More importantly, after long-term operation of the lift, when the guide wheel assembly or guide structure 100 experiences natural wear, maintenance personnel can easily readjust the guide wheel assembly to restore its fit with the guide structure 100. This compensatory design effectively offsets the negative impact of wear, extends the effective service life of the guide system and even the entire drive system, and reduces the total life-cycle maintenance cost.

[0053] Continue reading Figures 1 to 3 And see also Figure 5 In some embodiments of this utility model, the first adjustable guide wheel assembly 41 includes a first support 411, a first guide wheel body 412, and a first adjustment mechanism 413.

[0054] The first support 411 serves as the mounting base for the entire first adjustable guide wheel assembly 41. One end of the first support 411 is fixed to the side wall of the support body 11, while the other end is suspended. That is, the fixed end of the first support 411 is securely mounted on the support body 11 of the backpack frame assembly 200 via bolts, welding, or integral molding, while the suspended end of the first support 411 extends outward from the support body 11 towards the guide structure 100, providing a cantilevered working platform for the installation of the first guide wheel body 412. It can be understood that the first support 411 can be a cantilever support or a cantilever beam.

[0055] The first guide wheel body 412 is located at the suspended end of the first support 411 and can move relative to the first support 411 under the action of the first adjustment mechanism 413. The first guide wheel body 412 does not refer to a single wheel, but rather to a functional assembly. The first guide wheel body 412 typically includes the guide wheel itself, a bearing for supporting the rotation of the guide wheel, and a wheel seat or support block for accommodating and fixing the bearing.

[0056] The first adjustment mechanism 413 is connected to the first guide wheel body 412 and the first support 411 respectively, and is used to adjust the position of the first guide wheel body 412 relative to the first support 411.

[0057] Specifically, the first adjusting mechanism 413 can be a threaded adjusting mechanism, an eccentric shaft adjusting mechanism, or a wedge adjusting mechanism. In this embodiment, the most common and preferred method is to use a threaded adjusting mechanism.

[0058] Taking the threaded adjustment mechanism as an example: a threaded hole can be opened on the first support 411, and an adjusting bolt passes through the threaded hole, with its end pressing against the first guide wheel body 412. At the same time, a return spring or tension bolt is provided so that the first guide wheel body 412 is always pre-pressed against the end of the adjusting bolt.

[0059] The adjustment process of the first adjustable guide wheel assembly 41 provided in this embodiment of the utility model is as follows: During initial installation or subsequent maintenance, the installer can operate the first adjustment mechanism 413. For example, when the adjusting bolt is turned, the bolt moves forward or backward in the threaded hole of the first support 411. Since the end of the adjusting bolt contacts the first guide wheel body 412, the axial movement of the bolt will push or allow the first guide wheel body 412 to undergo controlled translation along the width direction of the frame body 10 (i.e., the direction perpendicular to the side of the guide structure 100).

[0060] By performing this operation, the installer can adjust the width of the guide channel formed by the guide wheel on the first adjustable guide wheel body 412 and the guide wheel on the opposite side of the second adjustable guide wheel group 51 to perfectly match the actual width of the guide structure 100, until both guide wheels are tightly fitted to the guide structure 100, achieving a state of zero gap or slight pre-tightening.

[0061] After adjustment, a lock nut can usually be used to lock the adjusting bolt to prevent position changes due to vibration or other reasons, ensuring the long-term effectiveness of the adjustment.

[0062] Continue reading Figures 1 to 3 And see also Figure 5 In some embodiments of this utility model, the second adjustable guide wheel group 51 includes a second support 511, a second guide wheel body 512, and a second adjustment mechanism 513. The second support 511, the second guide wheel body 512, and the second adjustment mechanism 513 are completely identical to the corresponding structures in the first adjustable guide wheel group 41 described above. The specific configuration is described in the above embodiments and will not be repeated here.

[0063] The second support 511 is embedded in the support body 11, the second guide wheel body 512 is located on the second support 511, and together with the first guide wheel body 412, it restricts the guide channel; the second adjustment mechanism 513 is connected to the second guide wheel body 512 and the second support 511 respectively, and is used to adjust the position of the second guide wheel body 512 relative to the second support 511.

[0064] It should be noted that the first adjustable guide wheel assembly 41 (i.e., the upper adjustable guide wheel assembly) and the second adjustable guide wheel assembly 51 (i.e., the lower adjustable guide wheel assembly) adopt an asymmetrical installation method. Specifically, the second support 511 of the lower adjustable guide wheel assembly is embedded in the support body 11, while the first support 411 of the upper adjustable guide wheel assembly is cantilevered. This structural difference is not arbitrary, but an optimized design based on the judgment of the stress model of the backpack frame assembly 200 under actual load-bearing conditions.

[0065] Since the center of gravity of the car 300 and its load, which is carried on the backpack frame assembly 200, is typically located on one side of the support body 11, when the car 300 is under load, this weight (G) will generate a huge overturning moment (M=G×L) around the contact point between the support body 11 and the guide structure 100, with its center of gravity being the distance (L) from the support body 11. This moment is the main cause of the elevator's swaying and instability.

[0066] To counteract this overturning moment and maintain system balance, the backpack frame's guiding system must provide a counteracting moment through the guide structure 100 (guide ladder). This counteracting moment is formed by the force couple generated by the combined action of the upper and lower guide mechanisms on the guide structure 100.

[0067] As the primary stress point, the lower guide wheel assembly is subject to overturning moment, causing the entire backpack frame to rotate around it. Therefore, the support body 11 exerts a direct compressive force on the lower end of the guide structure 100 via the second adjustable guide wheel assembly (lower guide wheel assembly). This force is the main supporting force resisting the overturning moment and is the point of greatest and most concentrated stress in the entire system.

[0068] The upper guide wheel assembly is a secondary force-bearing point, mainly used to balance the torque. The support body 11 exerts a compressive force on the upper end of the guide structure 100 through the first adjustable guide wheel assembly (upper guide wheel assembly), which is opposite in direction to the lower end. This force, together with the force of the lower guide wheel assembly, forms a torque couple, the resulting torque being equal in magnitude and opposite in direction to the overturning torque, thus maintaining system stability.

[0069] Based on the differences in the nature, magnitude, and direction of the forces at the primary and secondary stress points, this utility model has designed an asymmetrical installation structure: the second adjustable guide wheel group 51 (the lower guide wheel group is embedded in the support body 11, and the second support 511 is firmly integrated into the main structure of the support body 11, and even becomes part of the main structure, to provide the strongest rigidity and the most direct force transmission path to withstand the greatest pressure.

[0070] When the immense compressive force is transmitted from the guide structure 100 to the second guide wheel body 512, this force can be transferred by the second support 511 to the solid frame of the entire support body 11. The force is effectively distributed throughout the main structure, rather than being borne by a weak connector. This avoids any bending deformation or vibration that might occur in a cantilever beam structure. The force transmission path is the shortest and most direct, thereby minimizing displacement caused by structural elastic deformation and ensuring the absolute stability of the lower guide point.

[0071] Since the balancing force borne by the upper guide wheel assembly is usually less than the main supporting force of the lower guide wheel assembly, a cantilever structure is sufficient to provide adequate strength and rigidity, eliminating the need for a more complex embedded structure, thus optimizing cost and weight. Furthermore, the upper guide wheel assembly is typically located near the drive unit, and the cantilever design allows the guide wheels to be positioned ideally without spatial interference with other components such as the drive motor and gearbox.

[0072] It should also be noted that the specific structure and adjustment principle of the first adjustment mechanism 413 and the second adjustment mechanism 513 can be referred to the applicant's earlier patent application with publication number CN118992767A. Since the adjustment mechanism has been described in detail in its application to the back wheel assembly, it will not be repeated here.

[0073] Continue reading Figures 1 to 5 In some embodiments of this utility model, the first driving device 20 and the second driving device 30 have the same structure. The first driving device 20 and the second driving device 30 each include a driving bracket 21, a driving member 22, a driving gear 23 and a back pressure wheel group 24.

[0074] The drive bracket 21 is fixedly mounted on the support body 11. The drive bracket 21 is the load-bearing foundation of the drive device and can be an aluminum alloy or steel structural component. The drive bracket 21 is fixed to the support body 11 of the backpack frame assembly 200 by high-strength bolts or welding. The drive bracket 21 can be a mounting plate, a motor base, or a frame.

[0075] The drive unit 22 is fixedly mounted on the drive bracket 21. The drive unit 22 is an integrated power unit, mainly consisting of a motor and a reducer. The motor provides the original power and can be an AC variable frequency motor or a servo motor. The reducer is responsible for converting the high speed and low torque of the motor into the low speed and high torque required for the operation of the elevator. The reducer can be a planetary gear reducer directly connected to the output shaft of the motor.

[0076] The drive gear 23 is rotatably mounted on the drive bracket 21 via bearings and other components, and is rigidly connected to the output shaft of the drive component 22 via a key, spline, or flange to transmit torque. Its position is precisely designed so that its teeth can properly mesh with the rack 130 mounted on the guide structure 100 (such as the column 110 of the guide ladder).

[0077] The back pressure roller assembly 24 is also mounted on the drive bracket 21. The back pressure roller assembly 24 and the drive gear 23 are spaced apart on both sides of the guide structure 100, forming a relative layout. The back pressure roller assembly 24 is arranged to contact another surface of the guide structure 100 that is completely opposite to the surface where the rack 130 is located (e.g., the back of the guide ladder column 110) to ensure the meshing of the drive gear 23 and the rack 130.

[0078] The drive gear 23 and the back pressure wheel assembly 24 together form a pliers-like structure that firmly clamps the guide structure 100 in the middle. The continuous back pressure provided by the back pressure wheel assembly 24 perfectly counteracts the radial separation force generated by the drive gear 23, thereby forcibly ensuring that the drive gear 23 is always pressed stably against the rack 130 at the designed meshing depth.

[0079] Because the meshing state remains stable, impact contact and abnormal stress between the tooth surfaces are avoided, resulting in more even and slower wear of the gears and rack 130. This effectively extends the service life of the transmission components and reduces maintenance costs.

[0080] Figure 6 This is one of the installation diagrams of the backpack frame assembly in the gear and rack lifting system provided in this utility model embodiment. Figure 7 This is the second schematic diagram of the installation of the backpack frame assembly in the gear and rack lifting system provided in this embodiment of the utility model.

[0081] See Figure 6 and Figure 7 In some embodiments of this utility model, the meshing line between the drive gear 23 and the rack 130 coincides with the center line of the support body 11.

[0082] In traditional design schemes, the arrangement of drive gear 23 only considers spatial convenience. Its meshing line with rack 130 (i.e. the line of action of driving force) is usually deviated from the structural center line of support body 11, and there is an eccentricity (e) between the two.

[0083] When the drive gear 23 outputs a large driving force (F) to lift the load-bearing body 12, this off-center force generates an additional bending moment (M=F×e) on the support body 11. This additional bending moment causes the main structure of the entire support body 11 to tend to bend and deform. To resist this bending moment, the upper and lower guide wheel sets must generate unbalanced reaction forces, resulting in excessive compression of one guide wheel and reduced pressure on the other side, thus forcing the support body 11 to bend and generating unnecessary internal stress, which will accelerate structural fatigue over long-term operation. Furthermore, the force imbalance and elastic deformation of the structure are the main sources of severe vibration and harsh noise during equipment operation. At the same time, a considerable portion of the energy output by the drive system is consumed in overcoming structural deformation and unbalanced friction, rather than being used purely for lifting the load, resulting in low system efficiency.

[0084] In this embodiment of the invention, the meshing line of the drive gear 23 and the rack 130 coincides with the center line of the support 11, making the eccentricity (e) zero. That is, the line of action of the driving force completely coincides with the stiffness center line of the support 11. The driving force (F) is a pure axial load for the support 11, and no additional bending moment is generated (M=F×0=0).

[0085] Because the additional bending moment generated by the driving force itself is eliminated, the support 11 does not tend to bend or deform under stress. The entire backpack frame assembly 200 remains absolutely upright and stable under the driving force. This eliminates a major source of vibration, making the lift more stable and smooth during start-up, operation, and shutdown, and minimizing noise.

[0086] Furthermore, the driving force is transmitted directly along the centerline of the structure, resulting in the shortest and most direct path. All energy is efficiently used to overcome gravity and friction, with no energy wasted on causing unnecessary structural deformation. This maximizes the energy utilization of the entire system and achieves theoretically optimal transmission efficiency.

[0087] Meanwhile, without additional bending moment, the pressure on each symmetrically arranged guide wheel assembly, including the adjustable guide wheel assembly and the back pressure wheel assembly 24, remains balanced. This avoids accelerated wear caused by excessive pressure on one side of the wheel assembly, ensuring uniform and slow wear on all guide wheels and bearings, thereby significantly extending the maintenance cycle and service life of the entire guidance and drive system.

[0088] Continue reading Figure 1In some embodiments of this utility model, the first driving device 20 and the second driving device 30 are arranged opposite to each other; wherein, the first adjustable guide wheel group 41 is arranged adjacent to the driving gear 23 and the back pressure wheel group 24 in the first driving device 20; the second adjustable guide wheel group 51 is arranged adjacent to the driving gear 23 and the back pressure wheel group 24 in the second driving device 30, so as to suppress the local deformation and vibration of the driving device to the greatest extent and ensure the meshing posture of the driving gear 23 and the rack 130 under dynamic loading.

[0089] When the drive gear 23 and the back pressure wheel assembly 24 apply clamping force to the guide structure 100, these forces are balanced locally and instantaneously due to the solid lateral support provided by the adjacent guide wheel assembly, preventing the formation of an effective lever arm to twist or bend the drive bracket 21. This fundamentally eliminates the vibration source of the drive device itself, ensuring its high degree of attitude stability during operation.

[0090] Furthermore, due to the mass of the gear and rack 130 transmission, the precision requirements for meshing depth and meshing angle are extremely high. Any slight positional deviation will lead to poor meshing, impact, and uneven wear. In this embodiment of the invention, the guiding system and the drive system are no longer two independent modules, but rather form a functionally deeply coupled and mutually supportive organic whole. The stable drive device (thanks to the back pressure wheel set 24) provides a stable platform for the guiding system; the tightly fitted adjustable guide wheel set provides a positioning reference for the drive device. This ensures that even under conditions such as elevator start-up, braking, or sudden load changes, the drive gear 23 can still mesh with the rack 130 in an ideal posture to achieve smooth transmission and extend gear life.

[0091] Continue reading Figure 1 , Figure 3 and Figure 5 In some embodiments of this utility model, at least one of the first guide mechanism 40 and the second guide mechanism 50 further includes at least one side guide wheel. That is, at least one side guide wheel can be provided on either the first guide mechanism 40 or the second guide mechanism 50, or at least one side guide wheel can be provided on both the first guide mechanism 40 and the second guide mechanism 50. The side guide wheel provided on the first guide mechanism 40 is the upper side guide wheel 42, and the side guide wheel provided on the second guide mechanism 50 is the lower side guide wheel 52.

[0092] The side guide wheels in the first guide mechanism 40 are located on the first adjustable guide wheel group 41, and the side guide wheels in the second guide mechanism 50 are located on the carrier 12; wherein each side guide wheel is used to contact the side of the guide structure 100 to constrain the backpack frame assembly 200 to move along the length direction of the frame body 10.

[0093] The axle direction of each side guide wheel is perpendicular to the axle direction of the aforementioned first and second adjustable guide wheel sets 51. The working surface of the side guide wheel is its rim, which is used to contact the guide structure 100 (such as the side of the square tube or I-beam of the guide ladder) to constrain the movement of the backpack frame assembly 200 in the third dimension, that is, to constrain the movement of the backpack frame assembly 200 along the length direction of the frame body 10.

[0094] The upper side guide wheel 42 is located on the first adjustable guide wheel group 41, which means that the upper side guide wheel 42 and the upper forward guide wheel (first adjustable guide wheel group 41) are integrated in the top area of ​​the support body 11, together forming a high-rigidity upper constraint point.

[0095] The lower side guide wheel 52 is located on the carrier 12. That is, the lower side guide wheel 52 is not installed on the lower part of the support 11, but directly on the carrier 12 used for loading goods or personnel. This is equivalent to setting a constraint point at the source of the torsional moment. When the carrier 12 has a torsional tendency due to off-center loading, this tendency will be instantly and directly converted into pressure on the side of the guide structure 100 through the lower side guide wheel 52, and immediately obtain a reaction force.

[0096] Continue reading Figure 1 , Figure 3 and Figure 5 In some embodiments of this utility model, at least one of the first guide mechanism 40 and the second guide mechanism 50 further includes at least one fixed guide wheel; that is, at least one fixed guide wheel can be provided on either the first guide mechanism 40 or the second guide mechanism 50, or at least one fixed guide wheel can be provided on both the first guide mechanism 40 and the second guide mechanism 50. The fixed guide wheel provided on the first guide mechanism 40 is the upper fixed guide wheel 43, and the fixed guide wheel provided on the second guide mechanism 50 is the lower fixed guide wheel 53.

[0097] The fixed guide wheel in the first guide mechanism 40 is located on the support body 11 and opposite the first adjustable guide wheel group 41. The fixed guide wheel in the second guide mechanism 50 is located on the carrier body 12 and opposite the second adjustable guide wheel group 51. Each fixed guide wheel is used to contact the side of the guide structure 100 to constrain the backpack frame assembly 200 to move along the width direction of the frame body 10.

[0098] Essentially, each fixed guide wheel is positioned opposite to its corresponding adjustable guide wheel assembly, forming a fixed guide wheel that provides a stable and reliable reference surface for the adjustment process of the adjustable guide wheel assembly. The fixed guide wheel and its corresponding adjustable guide wheel assembly are located on opposite sides of the guide structure 100 (e.g., a guide ladder).

[0099] For example, the adjustable guide wheel assembly is located on the front of the guide structure 100, while the fixed guide wheel is located on the back of the guide structure 100, forming a pair with the adjustable guide wheel assembly. Together, they constitute a clamp-like constraint structure, which is a precision clamping system that can eliminate front and rear gaps and achieve zero backlash guidance. This system is used to constrain the movement of the backpack frame assembly 200 along the width direction of the frame body 10, i.e., to prevent it from swaying back and forth.

[0100] The upper fixed guide wheel 43 is located on the support body 11 and is opposite to the upper adjustable guide wheel group, together constraining the upper part of the guide structure 100. The lower fixed guide wheel 53 is located on the bearing body 12 and is opposite to the lower adjustable guide wheel group, together constraining the lower part of the guide structure 100.

[0101] During adjustment, the installer operates the adjustable guide wheel assembly to move it toward the fixed guide wheel until the wheel assemblies on both sides tightly clamp the guide structure 100 in the middle, completely eliminating the gap in the front and rear directions.

[0102] When the load-bearing body 12 tends to tilt backward or forward due to its own weight, this tendency acts directly on the lower fixed guide wheel mounted on it. The guide wheel immediately transmits this force to the guide structure 100, obtaining a reaction force, thereby suppressing the overturning tendency at the source of the force. This avoids the overturning force needing to be transmitted through the connection structure between the load-bearing body 12 and the support body 11, greatly improving the response speed and rigidity of the constraint.

[0103] The upper fixed guide wheel is located on the support body 11, serving as the upper fulcrum to resist the overturning moment. It is connected to the main frame of the sturdy support body 11, providing a stable and reliable point of application for balancing forces.

[0104] The aforementioned fixed guide wheels form a multi-point positioning constraint system in space, locking the backpack frame assembly 200 onto the guide structure 100 from the front-back, left-right, and torsional dimensions of the frame body 10, allowing it to move freely only in the vertical direction. This all-round rigid constraint enables ultra-high operational stability, safety, and reliability.

[0105] For situations where the car is 300mm wide or the center of gravity of the load is high, the torsional moment generated by the off-center loading will be even greater. This embodiment of the invention can extremely effectively suppress this huge torsional moment, ensuring smooth operation and safety under such extreme conditions.

[0106] Continue reading Figure 1 , Figure 3 and Figure 5In some embodiments of this utility model, at least one of the first guide mechanism 40 and the second guide mechanism 50 further includes an anti-detachment limiting member; that is, an anti-detachment limiting member can be provided on either the first guide mechanism 40 or the second guide mechanism 50, or simultaneously on both. In other words, the anti-detachment limiting member can be provided only in the upper first guide mechanism 40, only in the lower second guide mechanism 50, or simultaneously in both locations. In preferred embodiments, it is usually provided simultaneously in both locations to provide the most comprehensive protection. That is, the anti-detachment limiting member provided on the first guide mechanism 40 is called the upper anti-detachment limiting member 44, and the anti-detachment limiting member provided on the second guide mechanism 50 is called the lower anti-detachment limiting member 54.

[0107] Both the upper anti-slip limiting member 44 and the lower anti-slip limiting member 54 have gaps reserved between them and the guide structure 100, which are used to prevent the backpack frame assembly 200 from separating from the guide structure 100 when the adjustable guide wheel group and the fixed guide wheel fail to constrain the guide structure 100.

[0108] The anti-detachment limiting component is a passive, redundant mechanical safety part that, in the event of extreme failure, physically prevents the backpack frame assembly 200 from completely detaching or separating from the guide structure 100 (such as a guide ladder). Structurally, it can be a high-strength L-shaped stop, hook-like structure, or other form of protrusion installed on the support 11 or the load-bearing body 12.

[0109] Under normal operating conditions, the various anti-detachment limiting components do not contact any surface of the guide structure 100 and do not participate in the daily guiding operation of the backpack frame assembly 200. During normal operation, the backpack frame assembly 200 is constrained and runs smoothly on the guide structure 100 by the coordinated action of the adjustable guide wheel group, fixed guide wheel, and side guide wheel. A preset gap (e.g., a few millimeters) exists between the anti-detachment limiting components and the guide structure 100, and the anti-detachment limiting components have no impact on the system operation.

[0110] In an extreme failure state, the triggering condition is the failure of the adjustable guide wheel assembly and the fixed guide wheel to constrain the guide structure 100. Under the influence of its own weight or running inertia, the backpack frame assembly 200 will tilt or sway significantly. When its displacement exceeds the width of the reserved gap, the anti-slip limiting component will instantly make rigid contact with the side or back of the guide structure 100.

[0111] This rigid contact forms an insurmountable mechanical barrier, firmly hooking or blocking the backpack frame assembly 200 onto the guide structure 100, thereby effectively preventing catastrophic accidents such as overturning or falling from a height and ensuring the ultimate safety of the equipment and personnel.

[0112] It is understood that by introducing an anti-detachment limiting component, this embodiment of the invention adds an independent, purely mechanical, and highly reliable fault protection mechanism. This ensures that the safety of the entire system no longer depends solely on the integrity of the main steering component.

[0113] By reserving clearances, smooth, quiet, and low-wear operation is ensured in daily operation, while providing protection in critical moments, thus achieving a balance between high-performance operation and extreme safety assurance.

[0114] This utility model embodiment also provides a lifting device. The lifting device includes a guide structure 100, a car 300, and a backpack frame assembly 200 according to any of the above embodiments; the car 300 is disposed on the support body 11 and the load-bearing body 12 of the backpack frame assembly 200; the backpack frame assembly 200 engages with the rack 130 on the guide structure 100 and is guided by the guide structure 100.

[0115] The guide structure 100 is a standard section of a certain length, which includes symmetrically arranged columns 110 on both sides. Several central connecting plates and end connecting plates located at both ends are permanently fixed to the two columns 110 by welding or other methods, forming a rigid frame. The rack 130 is fixed to the middle position of the guide structure 100 by bolts or other fasteners.

[0116] The car 300 is the component that directly carries people or goods. The car 300 is mounted on the support body 11 and the load-bearing body 12 of the backpack frame assembly 200, which means that the entire weight of the car 300 and the various loads generated therefrom will be transferred to the guide structure 100 through the backpack frame assembly 200 provided by this utility model.

[0117] The backpack frame assembly 200 serves as a bridge connecting the guide structure 100 and the car 300, integrating guidance, drive, and load-bearing functions, and is the fundamental source of the high performance of the entire lifting equipment. When the drive device on the backpack frame assembly 200 is working, the drive gear 23 rotates, pushing the entire backpack frame assembly 200 and the car 300 mounted on it to achieve smooth vertical lifting and lowering movement along the rack 130 on the guide structure 100.

[0118] The zero-backlash guiding system provided by this invention offers an extremely stable platform for the meshing of the drive gear 23 and rack 130. Since the backpack frame assembly 200 itself does not wobble, the meshing relationship between the gear and rack 130 remains optimal throughout. This ensures smooth, continuous, and efficient transmission of driving force, fundamentally guaranteeing the stability and quietness of the lifting equipment's operation.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A backpack frame assembly, characterized in that, include: The frame itself has a support structure and a load-bearing structure; The first driving device and the second driving device are spaced apart along the height direction of the support body. The first guide mechanism includes at least two first adjustable guide wheel sets, each pair of first adjustable guide wheel sets being symmetrically arranged on the support body, and the first adjustable guide wheel sets being arranged adjacent to the first drive device; The second guide mechanism includes at least two second adjustable guide wheel sets, each pair of second adjustable guide wheel sets being symmetrically arranged on the support body, and the second adjustable guide wheel sets being arranged adjacent to the second drive device; The first adjustable guide wheel set and the second adjustable guide wheel set together define a guide channel for the guide structure to pass through. The first adjustable guide wheel set and the second adjustable guide wheel set are adapted to be adjusted along the width direction of the frame body so that the width of the guide channel matches the width of the guide structure.

2. The backpack frame assembly according to claim 1, characterized in that, The first adjustable guide wheel assembly includes: The first support has one end fixed to the support body and the other end suspended in the air; The main body of the first guide wheel is located at one of the suspended ends of the first support; The first adjustment mechanism is connected to the first guide wheel body and the first support respectively, and is used to adjust the position of the first guide wheel body relative to the first support.

3. The backpack frame assembly according to claim 1, characterized in that, The second adjustable guide wheel assembly includes: The second support is embedded in the support body; The second guide wheel body is located on the second support and together with the first adjustable guide wheel group, it restricts the guide channel. The second adjustment mechanism is connected to the second guide wheel body and the second support respectively, and is used to adjust the position of the second guide wheel body relative to the second support.

4. The backpack frame assembly according to claim 1, characterized in that, The first driving device and the second driving device each include: A drive bracket is fixedly mounted on the support body; The driving component is fixedly mounted on the driving bracket; A drive gear, rotatably mounted on the drive bracket and connected to the output shaft of the drive member, is used to mesh with a rack on the guide structure; and A back pressure roller assembly is provided, which is spaced apart from the drive gear and is used to contact the side of the guide structure opposite to the rack, so as to ensure the meshing of the drive gear and the rack.

5. The backpack frame assembly according to claim 4, characterized in that, The meshing line between the drive gear and the rack coincides with the center line of the support.

6. The backpack frame assembly according to claim 4, characterized in that, The first driving device and the second driving device are arranged opposite to each other; The first adjustable guide wheel group is disposed adjacent to the drive gear and the back pressure wheel group in the first drive device; the second adjustable guide wheel group is disposed adjacent to the drive gear and the back pressure wheel group in the second drive device.

7. The backpack frame assembly according to any one of claims 1 to 6, characterized in that, The first guide mechanism and / or the second guide mechanism further include at least one side guide wheel; The side guide wheel in the first guiding mechanism is disposed on the first adjustable guide wheel group, and the side guide wheel in the second guiding mechanism is disposed on the carrier. Each of the side guide wheels is used to contact the side of the guide structure to constrain the backpack frame assembly to move along the length of the frame body.

8. The backpack frame assembly according to any one of claims 1 to 6, characterized in that, The first guiding mechanism and / or the second guiding mechanism further include at least one fixed guide wheel; The fixed guide wheel in the first guide mechanism is disposed on the support body and located opposite the first adjustable guide wheel group; the fixed guide wheel in the second guide mechanism is disposed on the carrier body and located opposite the second adjustable guide wheel group. Each of the fixed guide wheels is used to contact the side of the guide structure to constrain the backpack frame assembly to move along the width direction of the frame body.

9. The backpack frame assembly according to claim 8, characterized in that, The first guide mechanism and / or the second guide mechanism further include an anti-detachment limiting element; A gap is reserved between the anti-detachment limiting component and the guide structure to prevent the backpack frame assembly from separating from the guide structure when the corresponding adjustable guide wheel group and the fixed guide wheel fail to constrain the guide structure.

10. A lifting device, characterized in that, Includes a guide structure, a car, and a backpack rack assembly as described in any one of claims 1 to 9; The car is mounted on the support and load-bearing body of the backpack frame assembly; The backpack frame assembly engages with the rack on the guide structure and is guided by the guide structure.

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