A guide rail type hydraulic lifting platform

Abstract

This utility model provides a guide rail type hydraulic lifting platform, including a lifting platform with anti-fall connectors installed at both ends of both sides of the lifting platform. Each anti-fall connector is fixed to one end of a corresponding chain. The chain is engaged with a sprocket rotatably mounted on the lifting frame, and its other end is fixed to a fixing plate fixedly mounted on two support columns. Guide rail pulleys that roll in contact with the support columns are rotatably mounted on both lifting frames. Vertical support columns are fixedly mounted at both ends above the base, and several anti-fall heads are fixedly mounted on the inner side of each support column. The output end of a hydraulic cylinder fixedly mounted on the base is fixed to the corresponding lifting frame directly above it. This utility model is equipped with anti-fall connectors and L-shaped anti-fall heads. When the chain breaks, the V-shaped clamp with a clamping shaft clamps the anti-fall head to achieve immediate anti-fall. A U-shaped barrier cover prevents chain whiplash. The structure is undisturbed under normal conditions and automatically responds to abnormalities, making it adaptable to the modification of existing equipment and improving safety.

Description

Technical Field

[0001] This utility model belongs to the field of lifting platform technology, and in particular relates to a guide rail type hydraulic lifting platform. Background Technology

[0002] Guide rail type hydraulic lifting platforms are widely used vertical transportation equipment in logistics, manufacturing, warehousing, and construction. They use hydraulic cylinders to drive the lifting frame, and with the help of chain transmission, achieve stable lifting and lowering of the platform. They are characterized by high load-bearing capacity and smooth operation, playing a crucial role in cargo loading and unloading, high-altitude operations, and material transport in multi-story buildings. However, the safety protection design of this type of equipment in the existing technology has significant deficiencies:

[0003] Lack of fall protection: Traditional platforms rely primarily on chain transmission for lifting power. When the chain breaks due to overload, fatigue, or connection failure, the platform loses support and falls rapidly. The lack of an immediate braking fall arrestor greatly increases the risk of equipment damage and personal injury.

[0004] When a chain breaks, the broken end will produce a violent "whiplash" motion due to inertia, and its high-speed swinging tail may strike platform operators or surrounding equipment. Traditional designs lack effective chain restraint structures, leading to frequent secondary injury accidents, especially in industrial workshops and warehouses, where such hazards pose a serious threat to operational safety.

[0005] Therefore, it is essential to invent a guide rail type hydraulic lifting platform. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a guide rail type hydraulic lifting platform, including a lifting platform, anti-fall connectors, chains, lifting frames, sprockets, fixing plates, guide rail pulleys, support columns, bases, hydraulic cylinders, and anti-fall heads. The anti-fall connectors are installed at both ends of both sides of the lifting platform. Each anti-fall connector is fixed to one end of the corresponding chain. The chain meshes with a sprocket rotatably mounted on the lifting frame, and its other end is fixed to a fixing plate fixedly mounted on two support columns. Guide rail pulleys that roll in contact with the support columns are rotatably mounted on both lifting frames. Vertical support columns are fixedly mounted at both ends above the base, and several anti-fall heads are fixedly mounted on the inner side of each support column. The output end of the hydraulic cylinder fixedly mounted on each base is fixed to the corresponding lifting frame directly above it.

[0007] Preferably, the anti-fall connector includes a tilting head, a side force plate, a spring, a spring seat, and a locking shaft. The tilting head is rotatably connected to the side of the lifting platform. One end of the tilting head is fixed to one end of the chain. The side force plate installed on one side of the chain is connected to the spring seat fixedly installed on the side of the lifting platform through the spring. The locking shaft is fixedly installed on the other end of the tilting head.

[0008] Preferably, the tilting clamp has a "V" shaped structure with an included angle of less than 90 degrees. The side fixed to the chain is always in a vertical state due to the pulling force, and a side force plate with an inclined surface is installed on one side. The inclined surface of the side force plate is elastically connected to the spring seat through the spring. When the tilting clamp is not under the pulling force of the chain, but under the weight of the spring and the clamp shaft, it can move in an arc trajectory towards the anti-fall head. That is, if the chain breaks or is damaged, the tilting clamp will be unlocked, thus moving in an arc trajectory and allowing the clamp shaft to lock onto the anti-fall head.

[0009] Preferably, the other part of the inclined clamp head on which the clamp shaft is installed is in an inclined state. When the inclined clamp head is under the pulling force of the chain, the clamp shaft installed on the inclined clamp head does not interfere with the anti-fall head. Conversely, when the pulling force disappears, the clamp shaft can be locked onto the anti-fall head.

[0010] Preferably, the anti-fall head has an "L" shaped structure, which is equidistantly arranged vertically along the axis of the supporting column on its lower inner side, without interfering with the lifting frame, and is located in the lower part of the lifting frame.

[0011] Preferably, four chain barriers are fixedly installed on both sides above the lifting platform, corresponding to the four chains. The chain barriers have a "U" shaped structure and are used to cover the chains, while the two do not interfere with each other.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention constructs a mechanically triggered fall protection mechanism by installing fall protection connectors on both sides of the lifting platform and cooperating with L-shaped fall protection heads on the supporting columns. When the chain breaks, the V-shaped inclined clamp of the fall protection connector, under the combined action of spring force and the weight of the clamp shaft, automatically moves along an arc trajectory towards the fall protection head, causing the clamp shaft to quickly engage with the horizontal section of the L-shaped fall protection head, achieving immediate braking of the platform. This design requires no electric or hydraulic assistance, has a short trigger time, fully meets the "overspeed pre-braking" requirement in safety regulations, and fundamentally eliminates the risk of falling after chain breakage.

[0014] The "U"-shaped chain barrier cover set above the lifting platform of the utility model forms a full-wrap protection for the chain. Its non-contact layout design with the chain neither interferes with the transmission function nor, when the chain breaks, restricts the swing range of the broken end through physical isolation, effectively blocking the harm of the "whip effect" to the personnel and equipment inside the platform, and making up for the defect of the lack of chain restraint structure in the traditional design.

[0015] The anti-falling connector of the utility model adopts an integrated V-shaped inclined chuck and spring seat design, achieving interference-free operation under normal conditions through the dynamic balance of chain tension and spring elasticity, and triggering braking only in abnormal conditions, automatically responding without additional operations. The L-shaped anti-falling heads are arranged at equal intervals along the support columns and are located in the non-interference area below the lifting frame, ensuring braking effectiveness without affecting the normal lifting trajectory of the platform. The overall structure does not change the core layout of the original hydraulic drive system and can be directly adapted to the retrofit and upgrade of existing equipment. Brief Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the utility model.

[0017] Figure 2 is the front-view structural schematic diagram of the utility model.

[0018] Figure 3 is the utility model Figure 2 partial enlarged structural schematic diagram at A.

[0019] In the figure:

[0020] lifting platform 1, anti-falling connector 2, inclined chuck 21, side force plate 22, spring 23, spring seat 24, card shaft 25, chain 3, lifting frame 4, sprocket 5, fixing plate 6, guide rail pulley 7, support column 8, base 9, hydraulic cylinder 10, anti-falling head 11, chain barrier cover 12. Detailed Description of the Preferred Embodiment

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0022] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0023] As attached Figure 1 To be continued Figure 3 As shown:

[0024] This utility model provides a guide rail type hydraulic lifting platform, including a lifting platform 1, anti-fall connectors 2, chains 3, lifting frames 4, sprockets 5, fixing plates 6, guide rail pulleys 7, support columns 8, base 9, hydraulic cylinders 10, and anti-fall heads 11. The anti-fall connectors 2 are respectively installed at both ends of both sides of the lifting platform 1. Each anti-fall connector 2 is fixed to one end of the corresponding chain 3. The chain 3 is engaged with the sprockets 5 rotatably mounted on the lifting frame 4, and its other end is fixed to the fixing plates 6 fixedly mounted on the two support columns 8. Guide rail pulleys 7 are rotatably mounted on both lifting frames 4, rolling in contact with the support columns 8. Vertical support columns 8 are fixedly mounted at both ends above the base 9, and several anti-fall heads 11 are fixedly mounted on the inner side of each support column 8. The output end of the hydraulic cylinder 10 fixedly mounted on each base 9 is fixed to the corresponding lifting frame 4 directly above it.

[0025] Furthermore, the fall arrestor connector 2 includes a tilting clamp 21, a side force plate 22, a spring 23, a spring seat 24, and a clamping shaft 25. The tilting clamp 21 is rotatably connected to a pre-set ear plate on the side of the lifting platform 1 via a pin, with a clearance fit between the pin and the ear plate to ensure flexible rotation. The end of the tilting clamp 21 near the chain 3 is fixed to the end of the chain 3 by a U-shaped clamp, the inner side of which has anti-slip textures to prevent loosening. The side force plate 22 on one side of the chain 3 is welded to the tilting clamp 21 as a single unit. The side of the force plate 22 away from the inclined clamp 21 is machined with a smooth inclined surface. This inclined surface is elastically connected to the spring seat 24 welded to the side of the lifting platform 1 by a spring 23. The two ends of the spring 23 are detachably connected to the inclined lug of the side force plate 22 and the hanging hole of the spring seat 24 by hooks, respectively, for later maintenance and replacement. The other end of the inclined clamp 21 away from the chain 3 is fixedly installed with a cylindrical clamp shaft 25 by a through bolt. The two ends of the clamp shaft 25 protrude from the side of the inclined clamp 21, and its axis is perpendicular to the extension direction of the inclined clamp 21.

[0026] Furthermore, the inclined clamp 21 is a V-shaped integral forged structure with an included angle of 60°-80° (less than 90°) on both sides to ensure structural stability under stress. The side fixed to the chain 3 (the active side) remains vertical under the continuous pulling force of the chain 3. The active side is fixed to the side force plate 22 by full welding on the side closest to the side force plate 22. The angle between the inclined surface of the side force plate 22 and the active side is 30°-45°. The top of the inclined surface is elastically connected to the spring seat 24 by a spring 23. The spring 23 is in a pre-compressed state under normal conditions to store elastic potential energy. When the tilting clamp 21 is not pulled by the chain 3 (i.e. the chain 3 breaks), the pre-compressed spring 23 releases its elastic force to push the side force plate 22. At the same time, the weight of the clamp shaft 25 generates a downward torque. The two work together to make the tilting clamp 21 move in an arc-shaped trajectory around the pin axis towards the anti-fall head 11. The center of the arc-shaped trajectory is the rotational connection point between the tilting clamp 21 and the lifting platform 1, and the trajectory radius is the length of the rotating arm of the tilting clamp 21.

[0027] Furthermore, the other side (driven side) of the inclined clamp 21 on which the clamp 25 is installed is inclined, and the angle between it and the driving side is consistent with the overall angle of the "V" shaped structure. Under the normal state of the inclined clamp 21 being pulled by the chain 3, the driven side is inclined upward, the distance between the axis of the clamp 25 and the support column 8 is greater than the protruding length of the anti-fall head 11, and the height of the clamp 25 is in the gap between two adjacent anti-fall heads 11, so it does not have any contact or interference with the anti-fall head 11; conversely, when the pulling force of the chain 3 disappears, under the combined action of the spring 23 thrust and the gravity of the clamp 25, the driven side rotates downward, and the clamp 25 moves downward in an arc with the driven side, and finally its outer circumferential surface can contact and lock with the upper surface of the horizontal section of the anti-fall head 11. The contact part between the clamp 25 and the anti-fall head 11 is processed with a wear-resistant coating to extend its service life.

[0028] Furthermore, the fall arrestor 11 is an "L"-shaped cast steel part, with rounded corners at the intersections of the horizontal and vertical sections to avoid stress concentration. The fall arrestors 11 are vertically arranged at equal intervals along the axis of the supporting column 8, with a spacing of 100-150mm between adjacent fall arrestors 11. They are all bolted into pre-set mounting grooves on the inner side of the supporting column 8. The depth of the mounting groove matches the thickness of the vertical section of the fall arrestor 11, ensuring that the outer surface of the fall arrestor 11 is flush with the inner side of the supporting column 8. The fall arrestor 11 is located in the lower part of the lifting frame 4, with a 20-30mm gap between the upper surface of its horizontal section and the lower surface of the lifting frame 4. This gap prevents interference with the lifting movement of the lifting frame 4 while allowing for quick reception of the retaining shaft 25 during fall arrest.

[0029] Furthermore, chain guards 12 are bolted to both sides of the upper part of the lifting platform 1. The chain guards 12 are made of steel plates with a thickness of 3-5mm and are bent. There are four of them, each corresponding to one of the four chains 3. Each chain guard 12 has a "U"-shaped structure with its opening facing the chain 3. The width of the guard is 20-30mm larger than the width of the chain 3. The height covers the chain 3 from the connection point of the lifting platform 1 to near the bottom of the sprocket 5. There is a 5-10mm gap between the inner wall of the guard and the chain 3 to ensure that the chain 3 does not come into contact with the guard during normal transmission and that the two do not interfere with each other. In the event of a chain 3 breakage, the guard can effectively prevent the chain 3 from "whipping" inward movement towards the platform.

[0030] The working principle is as follows: First, when the guide rail hydraulic lifting platform is started, the output end of the hydraulic cylinder 10 on the base 9 extends or retracts, driving the lifting frame 4 fixed thereto to move vertically along the support column 8; the guide rail pulley 7 on the lifting frame 4 rolls in contact with the support column 8, ensuring that the lifting frame 4 moves smoothly and does not deviate.

[0031] At the same time, the sprocket 5 on the lifting frame 4 moves synchronously with the lifting frame 4. One end of the chain 3 that meshes with the sprocket 5 is fixed on the fixing plate 6 of the supporting column 8, and the other end is connected to the lifting platform 1 through the anti-fall connector 2. Under the transmission action of the sprocket 5, the chain 3 pulls the lifting platform 1 to rise and fall synchronously with the lifting frame 4, realizing the vertical transportation function of the lifting platform 1.

[0032] During this process, under the continuous pulling force of the chain 3, the active side of the tilting head 21 of the anti-fall connector 2 remains vertical, and the spring 23 is in a pre-compressed state; the driven side of the tilting head 21 tilts upward, and the locking shaft 25 is in the gap between the adjacent anti-fall heads 11, without contacting the anti-fall heads 11, ensuring that the normal lifting of the lifting platform 1 is not disturbed.

[0033] When chain 3 breaks or is damaged, the pulling force of chain 3 on anti-fall connector 2 disappears. Under the combined action of the elastic force of spring 23 and the gravity of the locking shaft 25, the tilting head 21 of anti-fall connector 2 moves in an arc trajectory around the rotation point of lifting platform 1 toward anti-fall head 11. Finally, the locking shaft 25 on the driven side of the tilting head 21 is locked onto the anti-fall head 11 on the inner side of the support column 8. Through the support of the locking shaft 25 by the anti-fall head 11, the lifting platform 1 is prevented from continuing to descend, thus realizing the anti-fall function.

[0034] In addition, the chain barrier 12 above the lifting platform 1 always covers the chain 3 and does not interfere with the chain 3 when it is in normal transmission. When the chain 3 breaks, the chain barrier 12 can prevent the broken chain 3 from making a "whipping" motion towards the inside of the lifting platform 1, thus avoiding secondary damage to personnel or objects on the platform.

[0035] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A rail-mounted hydraulic lifting platform, characterized in that, The system includes a lifting platform (1), a fall arrestor (2), a chain (3), a lifting frame (4), a sprocket (5), a fixing plate (6), a guide rail pulley (7), a support column (8), a base (9), a hydraulic cylinder (10), and a fall arrestor (11). The fall arrestor (2) is installed at both ends of the lifting platform (1). Each fall arrestor (2) is fixed to one end of the corresponding chain (3). The chain (3) is engaged with the sprocket (5) rotatably mounted on the lifting frame (4). The other end is fixed to the fixing plate (6) fixedly installed on the two supporting columns (8). The two lifting frames (4) are rotatably installed with guide rail pulleys (7) that roll in contact with the supporting columns (8). Vertical supporting columns (8) are fixedly installed at both ends of the base (9), and several anti-fall heads (11) are fixedly installed on the inner side of each supporting column (8). The output end of the hydraulic cylinder (10) fixedly installed on each base (9) is fixed to the corresponding lifting frame (4) directly above.

2. A rail-mounted hydraulic lifting platform as claimed in claim 1, characterized in that: The anti-fall connector (2) includes a tilting head (21), a side force plate (22), a spring (23), a spring seat (24), and a locking shaft (25). The tilting head (21) is rotatably connected to the side of the lifting platform (1). One end of the tilting head (21) is fixed to one end of the chain (3). The side force plate (22) installed on one side of the chain (3) is connected to the spring seat (24) fixedly installed on the side of the lifting platform (1) through the spring (23). The locking shaft (25) is fixedly installed on the other end of the tilting head (21).

3. A rail-mounted hydraulic lifting platform as claimed in claim 2, wherein: The tilting clamp (21) has a "V" shaped structure with an included angle of less than 90 degrees. One side fixed to the chain (3) is always in a vertical state due to the pulling force, and a side force plate (22) with an inclined surface is installed on one side. The inclined surface of the side force plate (22) is elastically connected to the spring seat (24) through the spring (23). When the tilting clamp (21) is not under the pulling force of the chain (3), it can move in an arc trajectory towards the anti-fall head (11) under the gravity of the spring (23) and the clamp shaft (25).

4. A rail-mounted hydraulic lifting platform as claimed in claim 3, wherein: Another part of the inclined head (21) on which the shank (25) is installed is in an inclined state. When the inclined head (21) is under the pulling force of the chain (3), the shank (25) installed on the inclined head (21) does not interfere with the anti-fall head (11). On the contrary, when the pulling force disappears, the shank (25) can be locked in the anti-fall head (11).

5. A rail-mounted hydraulic lifting platform as claimed in claim 4, wherein: The anti-fall head (11) is an "L" shaped structure, which is arranged vertically at equal intervals along the axis of the support column (8) on its lower inner side, without interfering with the lifting frame (4), and is located in the lower part of the lifting frame (4).

6. A rail-mounted hydraulic lifting platform as claimed in claim 5, wherein: On both sides above the lifting platform (1), chain barrier covers (12) are fixedly installed. There are four of them in total, corresponding to the four chains (3). The chain barrier cover (12) has a "U" - shaped structure and is used to cover the chain (3) while the two do not interfere with each other.

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