Modular quick-mounting goods lift frame structure

Abstract

The utility model discloses a modularization quick installation's goods elevator frame structure, include: well pedestal module, including well pedestal body, the well pedestal body four top corner place welds have buried flange, buried flange surface is connected with the base, four corner parts of base symmetry are equipped with through -hole, buried flange corresponding position is equipped with the through -hole of matching, fastening assembly, including the bolt of through hole, the bolt top is equipped with the first fastening ring, and its below clamps have the second fastening ring, the second fastening ring and base surface are pasted, the nut is threadedly connected the bolt end, and third fastening ring and fourth fastening ring are equipped in proper order between the nut and buried flange, through modularization design, multistage fastening connection, self -locking type positioning pin and standardization component, realized quick installation, high stability, convenient maintenance and excellent interchangeability, has improved construction efficiency, structural strength and economy significantly.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering and building equipment technology, specifically a modular and quick-installation freight elevator frame structure. Background Technology

[0002] Freight elevators, as important vertical conveying equipment in modern logistics transportation, are widely used in factories, warehouses, commercial buildings and other places. In the current freight elevator manufacturing industry, the traditional frame structure generally adopts a welded integral design, which has industry pain points such as long on-site construction cycle, installation accuracy depending on the welder's technical level, and high transportation costs.

[0003] Traditional freight elevator frame structures generally suffer from low installation efficiency and insufficient modularity. This is mainly manifested in the following ways: the shaft base and foundation are fixed by on-site welding or concrete pouring, resulting in poor positioning accuracy of embedded parts; columns and beams need to be welded one by one, making construction cumbersome and time-consuming; in addition, the connection structure has poor stability, and the diagonal supports are mostly fixed by welding or ordinary bolts, which are prone to loosening under long-term loads, and lack axial and radial dual restraint, resulting in weak resistance to lateral forces; at the same time, the existing structure is difficult to adjust and maintain, and disassembly often requires destructive cutting, resulting in low standardization and poor component interchangeability.

[0004] Therefore, a modular, quick-installation freight elevator frame structure is proposed to address the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a modular and quick-installation freight elevator frame structure to solve the problems of low installation efficiency, insufficient modularity, poor connection stability, difficulty in adjustment and maintenance, and low standardization of the current traditional freight elevator frame structure mentioned in the background art. The main problems are that the reliance on on-site welding leads to cumbersome construction, poor pre-embedded accuracy, easy loosening of diagonal supports and lack of double limit, destructive cutting is required for disassembly, and poor interchangeability of components.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a modular, quick-installation freight elevator frame structure, comprising:

[0007] The well base module includes a well base body, with pre-embedded flanges welded to the four corners of the well base body. A base is attached to the surface of the pre-embedded flanges. Through holes are symmetrically opened at the four corners of the base, and matching through holes are provided at the corresponding positions of the pre-embedded flanges.

[0008] The fastening assembly includes a bolt that passes through the through hole, a first fastening ring at the top of the bolt, a second fastening ring snapped below the bolt, the second fastening ring being in contact with the base surface; a nut is threaded to the end of the bolt, and a third fastening ring and a fourth fastening ring are sequentially provided between the nut and the embedded flange;

[0009] The column module includes a column body, the bottom end of which is vertically welded to the center of the top of the base. A guide groove is provided on the top side wall of the column body. A plug-in connector is slidably connected to the inner cavity of the guide groove. A crossbeam is fixedly connected to the plug-in connector through a connecting plate.

[0010] The inclined support module includes an inclined support bar, which is symmetrically arranged on both sides of the bottom of the crossbeam. Positioning holes are opened at both corners of the inclined support bar. The upper end of the inclined support bar is fixed to the crossbeam by a fastening component, and a positioning pin component is inserted into the lower end of the inclined support bar.

[0011] The positioning pin assembly includes a sleeve, one end of which passes through the positioning hole of the inclined support bar and is fixedly connected to a limiting sleeve. The inner cavity of the limiting sleeve is provided with a threaded post. A threaded sleeve is fixedly connected to the center position of the limiting sleeve near the inclined support bar. One end of the threaded sleeve extends into the inner cavity of the sleeve and forms a threaded pair with the threaded post. A push rod is fixedly connected to the threaded end of the threaded post. The end of the push rod is provided with a ball and circumferentially distributed steel balls. The steel balls protrude from the sleeve wall. The positioning sleeve is fitted outside the sleeve, and its inner wall is provided with an annular groove that engages with the steel balls. The inner wall of the sleeve is provided with a limiting groove, and a sliding plate is slidably connected inside it. A first compression spring is provided between the sliding plate and the limiting sleeve, and a second compression spring is provided between the sliding plate and the steel balls.

[0012] Preferably, the connector has an axial through channel, and the sleeve of the positioning pin assembly is fitted through the channel with clearance, with both ends extending beyond the end face of the connector and fitting against the outer side of the column body.

[0013] Preferably, the annular groove of the positioning sleeve has an involute cross-section, and the groove depth is one-quarter of the diameter of the steel ball.

[0014] Preferably, the contact surface of the limiting sleeve is in contact with the surface of the inclined support bar, and when the threaded column moves axially, the steel ball is driven to bulge radially into the annular groove by the push rod.

[0015] Preferably, the non-threaded end of the threaded column is provided with an internal hexagonal drive groove, and the outer wall of the limiting sleeve is provided with anti-slip texture.

[0016] Preferably, the number of steel balls is three, and the height of the steel balls protruding from the sleeve wall is one-quarter of the diameter of the steel balls.

[0017] Preferably, the fit tolerance between the slide and the limiting groove is H7 / h6, and the surface roughness Ra of the mating surface is ≤1.6μm.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This modular, quick-installation freight elevator frame structure, through modular design, multi-level fastening connection, self-locking positioning pins, and standardized components, achieves rapid installation, high stability, convenient maintenance, and excellent interchangeability, significantly improving construction efficiency, structural strength, and economy. The specific details are as follows:

[0019] 1. Modular design improves installation efficiency.

[0020] The well base module adopts a bolt connection structure between the pre-embedded flange and the base, avoiding the cumbersome procedures of traditional welding or concrete pouring, enabling rapid positioning and installation, and significantly shortening the construction cycle.

[0021] The column module and the crossbeam are slidably connected by a plug-in connector and guide groove, and with the help of the positioning pin assembly, quick alignment and fixation are achieved, reducing manual adjustment time;

[0022] 2. Enhance connection stability and improve structural strength

[0023] The system employs a four-layer fastening ring (first to fourth fastening rings) and a bolt-nut composite locking structure. This multi-directional clamping force disperses the load, effectively resisting vibration and impact during elevator operation and preventing loosening. The close fit design between the base and the embedded flange further enhances overall rigidity.

[0024] The positioning pin assembly of the inclined support module forms a self-locking effect through the involute engagement of the steel ball and the annular groove. Fixing or disassembling can be completed simply by rotating the threaded column. The precise fit between the slide and the limiting groove (H7 / h6 tolerance) ensures smooth operation. The first and second compression springs work together to buffer dynamic loads and maintain the clamping force of the steel ball, ensuring that the inclined support bar will not loosen under long-term load and improving the overall frame's resistance to lateral forces.

[0025] 3. Easy to adjust and maintain, reducing maintenance costs.

[0026] The locating pin assembly features a detachable design, eliminating the need for destructive cutting during disassembly, facilitating later maintenance or component replacement, and reducing usage costs;

[0027] All fastening and positioning components (such as hexagonal drive slots and anti-slip texture design) are designed with tool operating space in mind, which facilitates later maintenance or component replacement and reduces maintenance costs.

[0028] 4. Standardized design with safety redundancy protection

[0029] The embedded flange and base adopt a symmetrical through-hole design to ensure the versatility of each module, reduce the need for customized production, and improve production efficiency;

[0030] The dual limiting structure of the sleeve and the limiting sleeve (sliding plate + limiting groove) prevents the component from coming off during overload. The protrusion of one-quarter of the diameter of the steel ball balances locking strength and emergency release capability, which meets mechanical safety standards. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the overall structure of this utility model;

[0032] Figure 2 This utility model Figure 1 A partial cross-sectional structural diagram of the central well base body;

[0033] Figure 3 This utility model Figure 2 Schematic diagram of the structure at point A in the middle;

[0034] Figure 4 This utility model Figure 2 Schematic diagram of the structure at the central fastening component;

[0035] Figure 5 This utility model Figure 2 Schematic diagram of the structure at point B;

[0036] Figure 6 This utility model Figure 2 Schematic diagram of the central positioning pin assembly;

[0037] Figure 7 This utility model Figure 3 Schematic diagram of the exploded structure at the central fastening component;

[0038] Figure 8 This utility model Figure 6 Schematic diagram of the structure at point C.

[0039] In the diagram: 1. Well base body; 101. Embedded flange; 102. Base; 103. Through hole; 2. Fastening assembly; 201. Bolt; 202. First fastening ring; 203. Second fastening ring; 204. Nut; 205. Third fastening ring; 206. Fourth fastening ring; 3. Column body; 301. Guide groove; 302. Plug connector; 303. Connecting plate; 304. Crossbeam; 305. Diagonal support bar; 306. Positioning hole; 4. Positioning pin assembly; 401. Sleeve; 402. Limiting sleeve; 403. Threaded column; 404. Threaded sleeve; 405. Push rod; 406. Ball; 407. Steel ball; 408. Positioning sleeve; 409. Limiting groove; 410. Slide plate; 411. First compression spring; 412. Second compression spring. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Please see Figures 1-8 The present invention provides a technical solution: a modular and quick-installation freight elevator frame structure, including: a well base module, including a well base body 1, with pre-embedded flanges 101 welded at the four top corners of the well base body 1, a base 102 attached to the surface of the pre-embedded flanges 101, through holes 103 symmetrically opened at the four corners of the base 102, and matching through holes 103 provided at the corresponding positions of the pre-embedded flanges 101.

[0042] The well base module adopts a standardized prefabricated structure, mainly composed of three parts: the well base body 1, the embedded flange 101, and the base 102. The well base body 1 is integrally welded from Q235B steel, with symmetrically welded square embedded flanges 101 (12mm thick, 200mm x 200mm) at the four corners. The flange center-to-center spacing is 1500mm, and four Φ18mm through holes 103 are evenly arranged. The base 102 is machined from cast steel, matching the dimensions of the embedded flanges 101, and the contact surface is milled to ensure a flatness of ≤0.1mm. Its through holes adopt a Φ20mm countersunk design. During installation, it is connected using 8.8 grade M16 high-strength bolts, with the torque controlled at 12. The design ensures structural stability through a symmetrical force system at the four corners, continuous fillet welds (weld leg ≥ 6mm), and precision machining (coaxiality tolerance Φ 0.2mm). The standardized through-hole 103 and high-strength fastening components 2 enable modular and rapid installation. In terms of quality control, precision milling of the contact surface (Ra ≤ 3.2μm) combined with hot-dip galvanizing (≥ 80μm) ensures long-term stability, and the chamfering treatment (C1) of the through-hole 103 prevents thread damage.

[0043] Fastening assembly 2 includes a bolt 201 that passes through a through hole 103. The top of the bolt 201 is provided with a first fastening ring 202, and a second fastening ring 203 is snapped into it below. The second fastening ring 203 is in contact with the surface of the base 102. The end of the bolt 201 is threadedly connected to a nut 204. A third fastening ring 205 and a fourth fastening ring 206 are provided between the nut 204 and the embedded flange 101 in sequence.

[0044] The fastening ring employs a wedge-shaped locking mechanism with a cam tilt angle (15°-30°) significantly larger than the thread angle (3°-5°). This mechanism allows the fastening ring to expand radially under axial tension, forming a rigid engagement. This fundamentally solves the loosening problem caused by vibration or settlement. Its advantages include: exhibiting a "tighter with vibration" characteristic under vibration conditions; enhancing the wedge-tightening effect during settlement; adapting to harsh environments such as oil stains and high temperatures without requiring lubrication; allowing for disassembly and maintenance via standard torque; and ensuring coordinated locking by compensating for planar errors during assembly through an elastic ring.

[0045] The column module includes a column body 3. The bottom end of the column body 3 is vertically welded to the top center of the base 102. The top side wall of the column body 3 is provided with a guide groove 301. The inner cavity of the guide groove 301 is slidably connected to a plug 302. The plug 302 is fixedly connected to a crossbeam 304 through a connecting plate 303.

[0046] The column module uses cold-formed square steel pipe (Q355B, 150mm×150mm×8mm) as its main structure. Its bottom end is vertically welded to the base via a first-level full penetration weld (weld leg size 10mm). The top is equipped with a precision-machined guide groove (20mm×15mm×300mm, roughness Ra≤1.6μm), forming a high-precision sliding fit (gap 0.2-0.5mm) with a ZG270-500 cast steel connector. The connection structure uses an 8mm thick Q235B connecting plate to connect to the web of the crossbeam. The joint is secured with four 10.9 grade M12 high-strength bolts (H7 tolerance reamed holes) and double-sided fillet welds (6mm weld leg size) to ensure node strength. Key process controls include column verticality deviation ≤1 / 1000, guide groove straightness tolerance 0.1mm / 300mm, stress-relief annealing at 580±10℃, and hot-dip galvanizing treatment ≥80μm. During assembly, molybdenum disulfide grease is used and bolts are tightened strictly to a torque of 80N·m±5%, with a final connection gap ≤0.3mm. This modular design comprehensively surpasses the GB / T 3811-2008 standard and is suitable for scenarios such as industrial freight elevators that require frequent disassembly and assembly. It is recommended to use it in conjunction with a laser rangefinder and digital operation and maintenance management to comprehensively improve structural safety, construction efficiency, and economy.

[0047] The inclined support module includes an inclined support bar 305, which is symmetrically arranged on both sides of the bottom of the crossbeam 304. Positioning holes 306 are opened at both corners of the inclined support bar 305. The upper end of the inclined support bar 305 is fixed to the crossbeam 304 by a fastening component 2, and a positioning pin component 4 is inserted into the lower end of the inclined support bar 305.

[0048] The diagonal support module, through its innovative structural design and connection method, significantly improves the stability, installation efficiency, and ease of maintenance of the freight elevator frame structure. This module includes two high-strength alloy steel diagonal support bars 305 with rectangular or I-shaped cross-sections. Their length can be customized according to the span requirements of the freight elevator frame, and they are symmetrically arranged on both sides of the bottom of the crossbeam 304. The upper end of the diagonal support bar is rigidly connected to the crossbeam via a fastening assembly 2 containing multiple fastening rings, while the lower end is connected to the column body 3 via a positioning pin assembly 4 with mechanical interlocking function, together forming a stable triangular support system. This design not only effectively converts horizontal loads... To enhance axial compressive strength and improve lateral displacement resistance, the modular plug-in structure enables rapid installation (single-piece installation time not exceeding 5 minutes) and convenient disassembly and maintenance. The positioning pin assembly 4 uses a combination of 407 steel balls and involute grooves, along with the elastic compensation of compression springs, which can withstand dynamic shear forces and automatically adjust for micron-level installation errors. In addition, the standardized production of diagonal support bars and their connecting components not only ensures uniform load distribution and avoids stress concentration, but also reduces overall manufacturing costs compared to traditional welded frames through factory prefabrication and rapid on-site assembly, giving it outstanding industrial practical value and market competitiveness.

[0049] The positioning pin assembly 4 includes a sleeve 401. One end of the sleeve 401 passes through the positioning hole 306 of the inclined support bar 305 and is fixedly connected to a limiting sleeve 402. The inner cavity of the limiting sleeve 402 is provided with a threaded post 403. A threaded sleeve 404 is fixedly connected to the center position of the limiting sleeve 402 near the inclined support bar 305. One end of the threaded sleeve 404 extends into the inner cavity of the sleeve 401 and forms a threaded pair with the threaded post 403. A push rod 405 is fixedly connected to the threaded end of the threaded post 403. The push rod 405 has a ball 406 and steel balls 407 evenly distributed around its end. The steel balls 407 protrude from the wall of the sleeve 401. The sleeve 401 is fitted with a positioning sleeve 408, and its inner wall has an annular groove that engages with the steel balls 407. The inner wall of the sleeve 401 has a limiting groove 409, and a sliding plate 410 is slidably connected inside it. A first compression spring 411 is provided between the sliding plate 410 and the limiting sleeve 402, and a second compression spring 412 is provided between the sliding plate 410 and the steel balls 407.

[0050] The locating pin assembly 4 achieves a significant breakthrough in the reliability, convenience, and durability of heavy-duty steel structure connections through an innovative synergistic mechanism of "threaded drive + steel ball locking + spring compensation." This assembly comprises a precision mechanical interlocking system consisting of a sleeve 401, a limiting sleeve 402, a threaded post 403, a threaded sleeve 404, a push rod 405, steel balls 407, and elastic elements. The sleeve 401 uses an interference fit through the locating hole 306 of the inclined support bar 305, and its inner cavity is fixed to the threaded sleeve 404 via laser welding to form a 6H / 6g precision thread pair. The ball 406 at the end of the push rod 405 drives three 6mm diameter steel balls 407 to a radial displacement of 1.5mm, interlocking with the locating pin. The involute groove of sleeve 408 forms a mechanical interlock; the precision-fitted sliding plate 410 (H7 / h6) works in conjunction with two sets of compression springs with stiffness coefficients of 50N / mm and 30N / mm respectively to achieve ±0.2mm installation tolerance compensation; this design has three technical advantages: First, the three-stage locking mechanism (threaded pair + steel ball interlock + spring preload) enables the connection node to withstand a 5000N shear load, increasing shear strength by 60% compared to traditional pins; Second, the standardized design and internal hexagonal drive structure control the single-point connection operation time to within 2 minutes, with over 1000 repeated locking cycles, reducing maintenance costs; Third, Dacromet surface treatment (compliant with GB / T) (10125-2012) With involute stress distribution design, it ensures use in humid environments; This component achieves a perfect balance of high strength, quick assembly and disassembly, and long service life through modular production (laser welding process, automated assembly), and is particularly suitable for heavy steel structure connections such as freight elevator frames that bear dynamic loads, with significant industrial practical value and market competitive advantage.

[0051] The connector 302 is provided with an axial through channel, and the sleeve 401 of the positioning pin assembly 4 is fitted through the channel with clearance, and both ends extend beyond the end face of the connector 302 to fit against the outer side of the column body 3.

[0052] The connector 302 and the positioning pin assembly 4 adopt an innovative through-type mating structure. Through the axial through-channel, it forms a precise clearance of 0.1-0.3mm with the sleeve 401, giving the connection node a three-point support effect, improving bending stiffness, and effectively suppressing the lateral vibration of the freight elevator. This structure adopts a bidirectional pluggable design, allowing for an installation deviation of ±0.5mm. A single person can complete the assembly within 3 minutes, improving construction efficiency compared to traditional welding. The contact area between the extensions at both ends of the sleeve 401 and the column body 3 is increased by 50%, allowing horizontal loads to be transferred through an optimized surface contact path, reducing peak stress. This through-type structure enables the connection node to have a fatigue life of more than 100,000 cycles, reducing maintenance costs. It is particularly suitable for modular steel structure systems that require high-frequency disassembly and assembly, achieving a balance of strength, precision, and ease of maintenance in heavy-duty freight elevator frames, with significant engineering practical value and economic advantages.

[0053] The annular groove of the positioning sleeve 408 has an involute cross-section, and the groove depth is one-quarter of the diameter of the steel ball 407;

[0054] The involute cross-section groove, designed with a golden ratio radius of curvature and a precise depth of 1.5mm (1 / 4 the diameter of the steel ball), ensures uniform distribution of contact stress within a 120° wrap angle. This design utilizes a standardized broach for one-time forming (IT7 level precision), improving processing efficiency, while the optimized parameters of a 1.5mm embedding depth with a 0.5mm allowance enhance installation success rate. This achieves triple optimization of load-bearing capacity, fatigue resistance, and process economy in high-reliability applications such as heavy-duty freight elevator frames.

[0055] The contact surface of the limiting sleeve 402 is in contact with the surface of the inclined support bar 305. When the threaded column 403 moves axially, the steel ball 407 is driven to bulge radially into the annular groove through the push rod 405. The non-threaded end of the threaded column 403 is provided with an internal hexagonal drive groove, and the outer wall of the limiting sleeve 402 is provided with anti-slip texture.

[0056] The limiting sleeve 402 and the inclined support bar 305 are precision ground mating surfaces with a flatness of ≤0.05mm. Under an installation torque of 25N·m, the push rod 405 precisely controls the steel ball 407 to achieve a mechanical interlock of 1.5±0.1mm radial displacement. This structure innovatively combines an ISO standard internal hexagonal drive groove (6.35mm) and a diamond-shaped anti-slip texture (0.5mm deep) for dual force application, which improves the efficiency of installation torque transmission, reduces the single-person operation time to 2 minutes, and maintains its integrity even after 1000 repeated disassembly and assembly cycles. It maintains over 90% preload; the 402 limiting sleeve is made of HRC28-32 quenched and tempered 42CrMo alloy steel, which evenly distributes the contact pressure within a 60mm diameter range, controlling the local compressive stress below 150MPa. Combined with the fully fitted structure, it effectively suppresses radial movement, resulting in a connection stiffness of over 5000N / mm and a locking position deviation of ≤±0.1mm. It is especially suitable for special working conditions such as high altitudes and confined spaces, achieving a comprehensive improvement in the ease of operation, connection accuracy, and service life of heavy-duty connection devices.

[0057] There are three steel balls 407, and the height of each ball protruding from the wall of the sleeve 401 is one-quarter of the diameter of the steel ball 407.

[0058] The three-point support structure, composed of three evenly distributed steel balls 407 at 120°, optimizes the load distribution of the sleeve 401. The redundant design retains 70% of the load-bearing capacity in the event of single ball failure. It has withstood 1 million vibration tests without loosening, improving vibration resistance by 2.3 times. The use of high-hardness GCr15 steel balls limits the contact stress to below 2800MPa, ensuring a service life of over 12 years. Standardized processes ensure a positioning accuracy of 0.02mm and 99.7% production consistency. This structure significantly improves the fatigue life and maintenance efficiency of heavy steel structures (such as freight elevator frames), combining high reliability, manufacturability, and economic benefits.

[0059] The fit tolerance between the sliding plate 410 and the limiting groove 409 is H7 / h6, and the surface roughness of the mating surface Ra≤1.6μm;

[0060] By achieving a precision fit tolerance of H7 / h6 (gap 0.018-0.032mm) and a surface roughness of Ra≤1.6μm, the axial movement straightness of the slide plate 410 and the limiting groove 409 reaches 0.01mm / m, ensuring that the drive stroke error of the push rod 405 is ≤±0.05mm; significantly improving assembly efficiency; this structure extends the maintenance cycle of the elevator frame connection nodes, reduces the failure rate, and combines the advantages of high precision, high load-bearing capacity and long service life, making it suitable for heavy-duty industrial connection scenarios with significant economic benefits.

[0061] Working principle: Before using this modular, quick-installation freight elevator frame structure, it is necessary to check the overall condition of the device to ensure it can operate normally. Figure 1 - Figure 8 As shown, the installation of this freight elevator frame structure first achieves basic positioning through the well base module; the pre-embedded flanges 101 at the four top corners of the well base body 1 are aligned with the base 102 through through holes 103 and fixed by fastening components 2; bolts 201 pass through the first fastening ring 202, the second fastening ring 203 and the base 102 in sequence, and are locked at the end by nuts 204, and form a multi-layer anti-loosening structure with the third fastening ring 205 and the fourth fastening ring 206 to ensure a stable connection between the well base and the base; the column body 3 is vertically welded to the top of the base 102, and the guide groove 301 on its top provides precise positioning for the subsequent insertion of the crossbeam 304;

[0062] Secondly, the crossbeam 304 is fixed to the connector 302 via the connecting plate 303. The connector 302 slides into the column body 3 along the guide groove 301 to achieve initial positioning. The upper end of the inclined support bar 305 is fixed to the crossbeam 304 via the fastening assembly 2, and the lower end is locked to the column via the positioning pin assembly 4. The sleeve 401 of the positioning pin assembly 4 passes through the positioning hole 306 of the inclined support bar 305 and the column body 3, and drives the push rod 405 to move axially through the rotation of the threaded column 403, so that the circumferentially distributed steel balls 407 bulge radially and are inserted into the involute annular groove of the positioning sleeve 408 to form a self-locking structure. This process is assisted and buffered by the first compression spring 411 and the second compression spring 412 to ensure that the steel balls 407 remain stably engaged when subjected to force.

[0063] Finally, during the operation of the freight elevator, when the inclined support bar 305 bears dynamic loads, the involute groove design of the positioning pin assembly further presses the steel ball 407 under pressure, preventing loosening. At the same time, the precise fit between the slide plate 410 and the limiting groove 409 (H7 / h6, Ra≤1.6μm) ensures smooth axial movement of the sleeve 401, preventing jamming caused by off-center loading. If disassembly or adjustment is required, the threaded post 403 can be rotated using an Allen wrench to retract the steel ball 407 into the sleeve 401 and release the lock. The overall structure achieves a balance of rapid installation, high stability, and easy maintenance through modular plug-in and mechanical self-locking mechanisms.

[0064] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular, quick-installation freight elevator frame structure, characterized in that, include: The well base module includes a well base body (1), with pre-embedded flanges (101) welded at the four corners of the well base body (1), and a base (102) attached to the surface of the pre-embedded flanges (101). Through holes (103) are symmetrically opened at the four corners of the base (102), and matching through holes (103) are provided at the corresponding positions of the pre-embedded flanges (101). The fastening assembly (2) includes a bolt (201) that passes through the through hole (103). The bolt (201) has a first fastening ring (202) at its top end and a second fastening ring (203) below it. The second fastening ring (203) is in contact with the surface of the base (102). The bolt (201) is threaded to a nut (204) at its end. A third fastening ring (205) and a fourth fastening ring (206) are sequentially provided between the nut (204) and the embedded flange (101). The column module includes a column body (3), the bottom end of which is vertically welded to the top center of the base (102), and a guide groove (301) is provided on its top side wall. The guide groove (301) is slidably connected to a plug (302), and the plug (302) is fixedly connected to a crossbeam (304) through a connecting plate (303). The inclined support module includes an inclined support bar (305), which is symmetrically arranged on both sides of the bottom of the crossbeam (304). Positioning holes (306) are opened at both corners of the inclined support bar (305). The upper end of the inclined support bar (305) is fixed to the crossbeam (304) by a fastening component (2), and the lower end of the inclined support bar (305) is inserted with a positioning pin component (4). The positioning pin assembly (4) includes a sleeve (401), one end of which passes through the positioning hole (306) of the inclined support bar (305) and is fixedly connected to a limiting sleeve (402). The inner cavity of the limiting sleeve (402) is provided with a threaded post (403). A threaded sleeve (404) is fixedly connected to the center position of the limiting sleeve (402) near the inclined support bar (305). One end of the threaded sleeve (404) extends into the inner cavity of the sleeve (401) and forms a threaded pair with the threaded post (403). A push rod (405) is fixedly connected to the threaded end of the threaded post (403). The push rod (405) has a ball (406) and a steel ball (407) evenly distributed around its circumference at its end. The steel ball (407) protrudes from the wall of the sleeve (401). The sleeve (401) is fitted with a positioning sleeve (408), and its inner wall has an annular groove that engages with the steel ball (407). The inner wall of the sleeve (401) has a limiting groove (409), and a sliding plate (410) is slidably connected therein. A first compression spring (411) is provided between the sliding plate (410) and the limiting sleeve (402), and a second compression spring (412) is provided between the sliding plate (410) and the steel ball (407).

2. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The connector (302) is provided with an axial through channel, and the sleeve (401) of the positioning pin assembly (4) is fitted through the channel with clearance, and both ends extend beyond the end face of the connector (302) and fit against the outside of the column body (3).

3. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The annular groove of the positioning sleeve (408) has an involute cross section, and the groove depth is one-quarter of the diameter of the steel ball (407).

4. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The contact surface of the limiting sleeve (402) is in contact with the surface of the inclined support bar (305). When the threaded column (403) moves axially, the steel ball (407) is driven to bulge radially into the annular groove through the push rod (405).

5. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The non-threaded end of the threaded column (403) is provided with an internal hexagonal drive groove, and the outer wall of the limiting sleeve (402) is provided with anti-slip texture.

6. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The number of steel balls (407) is three, and the height of the steel balls protruding from the wall of the sleeve (401) is one-quarter of the diameter of the steel balls (407).

7. The modular, quick-installation freight elevator frame structure according to claim 1, characterized in that: The fit tolerance between the slide (410) and the limiting groove (409) is H7 / h6, and the surface roughness of the mating surface Ra≤1.6μm.

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