Reciprocating type double-chain lifting conveying device

Abstract

According to the reciprocating type double-chain lifting conveying device, the follow-up chain wheel with the copper sleeve is introduced into the chain transmission device structure, independent tensioning of the transmission chain is achieved, and mutual influence of different chains during tensioning in a multi-chain scene is avoided. And the loading requirements of the reciprocating type lifting conveying device in different scenes can be met. According to actual needs, the number of chains of the reciprocating type lifting conveying device is flexibly designed and arranged, and the problems that chains on the two sides of a traditional reciprocating type chain lifting conveying device cannot be tensioned synchronously, teeth jump frequently after the chains run and are stretched, and a lifting table is unbalanced are solved. And the application range and the operation stability of the reciprocating type chain lifting conveying device are improved.

Description

Technical Field

[0001] This utility model relates to the field of cigarette conveying and lifting equipment, especially to the field of chain-type lifting equipment used in reciprocating lifting operations, specifically a reciprocating double-chain lifting and conveying device. Background Technology

[0002] In the cigarette packing process, with the application of flexible packing systems, reciprocating elevators are typically used to transport cigarette cartons at different heights to meet the requirements. Reciprocating elevators are mainly divided into synchronous belt drive type and chain drive type. Synchronous belt drive type elevators have low load-bearing capacity and low safety; fatigue fracture of the synchronous belt can lead to serious consequences. Chain drive type elevators are further divided into single-chain and double-chain types. Single-chain type elevators are prone to chain stretching after long-term operation, leading to problems such as skipped teeth and sagging, and are therefore less commonly used. Double-chain elevators are a common type of vertical transport equipment. They connect the lifting device and the load platform through two parallel chains and are typically used for the vertical transport of materials or personnel in construction sites, factory workshops, and other similar locations.

[0003] Traditional double-chain drive hoists utilize an electric motor to drive a reducer, which in turn drives two parallel chains via sprockets. These chains then mesh with two sprockets on the lifting device, thus achieving the lifting and lowering movement of the load platform. To ensure stability and safety during the lifting process, the two chains must move synchronously, and their tension should be as consistent as possible. However, chains from different batches, even those of the same specifications, may exhibit slight differences in materials and manufacturing processes. These differences can lead to varying elongations under the same load. During installation, improper preload settings on the two chains, or insufficient meshing precision between the chains and sprockets, can cause different amounts of elongation after a period of operation. Over extended use, uneven load distribution or improper maintenance may cause one chain to wear out faster than the other, thus affecting the synchronicity of the two chains. When the two chains of a double-chain hoist are stretched unevenly, it results in different chain tensions. The stretched chains cannot achieve independent tension, leading to imbalance during hoist operation, such as tooth skipping and platform imbalance. Abnormal contact between the chains and sprockets accelerates wear, shortens equipment lifespan, and compromises safety. In such cases, adjusting the synchronization of the two chains requires stopping the machine for disassembly and maintenance, a cumbersome, inconvenient, and time-consuming process. Summary of the Invention

[0004] To address the shortcomings and defects of the existing technology, the inventor has improved the design and provided a novel reciprocating chain lifting and conveying device. This device features a follower sprocket structure with a copper sleeve mounted on the driven shaft and support shaft of the chain lifting device. This facilitates independent tensioning of two or more chains within the reciprocating chain lifting device. When two or more chains experience varying degrees of tension, the balance of the entire chain lifting transmission device can be maintained by adjusting the tension of a single chain. Specifically, this invention is implemented as follows:

[0005] A reciprocating double-chain lifting conveyor includes a lifting bracket, two chains installed at the top and bottom of the lifting bracket, and further includes:

[0006] The motor is installed at the bottom of the lifting bracket and is connected to the chain through a transmission component, which can drive the chain to rotate in both directions;

[0007] The lifting platform is installed in the middle of the lifting support, with its top and bottom surfaces connected to both ends of the chain, and can rise and fall with the pull of the chain;

[0008] The drive shaft is located on the bottom of the lifting bracket near the motor. Both ends are equipped with first fixed sprockets. The motor can drive the drive shaft to rotate, and the two first fixed sprockets can rotate with the rotation of the drive shaft.

[0009] The driven shaft is located on the opposite side of the driving shaft, with a second fixed sprocket installed at one end and a first follower sprocket installed at the other end;

[0010] Two support shafts are installed on the top of the lifting bracket. Each support shaft has a second follower sprocket installed at one end and a third fixed sprocket installed at the other end.

[0011] Two sets of chains of equal length are respectively fitted onto both ends of the shaft, forming a symmetrical installation. One set of chains is fitted between the first fixed sprocket, the first follower sprocket, and the two third fixed sprockets, and is used for transmission and active rotation. The other set of chains is fitted between the first fixed sprocket, the second fixed sprocket, and the two second follower sprockets. Both ends are connected to the top and bottom surfaces of the lifting platform, and the chains and the lifting platform form two ring structures. The first follower sprocket and the second follower sprocket can rotate independently relative to the driven shaft and the support shaft, which is a non-fixed, non-transmission connection.

[0012] Furthermore, the two support shafts are a first support shaft and a second support shaft, wherein the second follower sprockets are both at the same end, and the third fixed sprockets are both at the other end. The end of the first follower sprocket on the driven shaft is the same end as the second follower sprocket, and they are connected and installed with the same chain.

[0013] Furthermore, the inner rings of the first and second follower sprockets are made of copper sleeves, which are mounted on the driven shaft and the support shaft, and can rotate around the shaft as the chain moves.

[0014] Furthermore, the first fixed sprocket, the second fixed sprocket, and the third fixed sprocket all have keyways on their inner rings, which are keyed together and installed on the drive shaft, the transmission shaft, and the support shaft to transmit power and drive the shaft to rotate.

[0015] Furthermore, a synchronous pulley is mounted on the drive shaft, and the motor is connected to the synchronous pulley via a synchronous toothed belt to transmit power to the drive shaft.

[0016] Furthermore, both the first and second support shafts are mounted on the top of the lifting bracket via bearing seats; both ends of the drive shaft and driven shaft are fixed during installation by mounting bearing sleeves or bearing seats.

[0017] Furthermore, the lifting bracket is equipped with two vertically arranged lifting guide rails, and guide wheels are provided at both ends of the lifting platform. The guide wheels are respectively placed on both sides of the lifting guide rails, and the guide wheels can be limited and guided to roll along the lifting guide rails.

[0018] The working principle of this utility model: The reciprocating double-chain lifting and conveying device proposed in this utility model introduces a follower sprocket with a copper sleeve into the chain drive structure, realizing the independent configuration of the first chain and the second chain. That is, when it is necessary to adjust the tension of the chain synchronously, it is not necessary to disassemble the entire chain. Only the tension of the chain on one side of the drive sprocket needs to be adjusted, and the tension of the other follower sprocket can be directly adjusted. Since it is not connected to the shaft, it can rotate around the shaft, so it can be quickly and conveniently adjusted to the same tension as the other chain, improving the efficiency and convenience of maintenance operations. On the other hand, in actual use, the follower sprocket does not rotate synchronously with the drive shaft. Therefore, when the chain on one side changes, the chain on the follower sprocket side can adaptively compensate for the rotation, realizing the uniform distribution of chain force, avoiding the occurrence of traditional tooth skipping phenomenon, and reducing the number and frequency of lifting platform offset jamming. It realizes independent tensioning of the drive chain and avoids mutual interference when different chains are tensioned in multi-chain scenarios.

[0019] The beneficial technical effects of this utility model are as follows:

[0020] 1. Improved maintenance efficiency: The use of a follower sprocket design with a copper sleeve makes chain tension adjustment more convenient and faster. When chain tension needs to be adjusted, there is no need to disassemble the entire chain; simply adjust the tension on one side of the chain, and the follower sprocket on the other side will quickly adjust to the corresponding state, thus significantly improving the efficiency of maintenance operations.

[0021] 2. Enhanced system stability: The design of the follow-up sprocket allows it to rotate freely around the axis, automatically adapting and compensating when the chain on one side changes, ensuring uniform chain force, reducing the risk of tooth skipping caused by uneven chain force, as well as the risk of the lifting platform shifting or jamming, thereby enhancing the stability and reliability of the system.

[0022] 3. Simplified installation and commissioning process: The independently configured first and second chains make installation and commissioning easier. In particular, when partial repairs or replacements are required, they can be operated independently without affecting other parts, reducing overall maintenance costs.

[0023] 4. Optimized chain tensioning mechanism: This design enables independent tensioning of the transmission chain, avoiding mutual interference between different chains when tensioning in multi-chain application scenarios. This helps maintain the efficient operation of the entire system and also helps extend the service life of the chain.

[0024] 5. Reduced failure rate: Through the above design features, the potential failure points during system operation are effectively reduced, such as common problems such as chain breakage and tooth skipping, thereby reducing equipment downtime and maintenance frequency.

[0025] It can adapt to the load requirements of reciprocating lifting conveyors in different scenarios. Based on actual needs, the number of chains in the reciprocating lifting conveyor can be flexibly designed and arranged, overcoming the problems of traditional reciprocating chain lifting conveyors where the chains on both sides cannot be tensioned synchronously, and frequent issues such as tooth skipping and platform imbalance after chain stretching during operation. This improves the application range and operational stability of the reciprocating chain lifting conveyor. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural view of a reciprocating double-chain lifting and conveying device according to the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the driving shaft and driven shaft of this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the first and second support shafts of this utility model;

[0029] Figure 4 This is a three-dimensional structural diagram of the lifting platform of this utility model;

[0030] Figure 5 This is a schematic diagram of the top part of a reciprocating double-chain lifting and conveying device according to the present invention;

[0031] Figure 6 An exploded view of the structure of the driving shaft and the driven shaft;

[0032] Figure 7An exploded view of the structure of the first and second support shafts;

[0033] Figure 8 This is a three-dimensional schematic diagram of the transmission system of a reciprocating double-chain lifting and conveying device.

[0034] in:

[0035] 1—Lifting bracket, 11—Lifting platform, 12—Drive shaft, 13—Driven shaft, 14—First support shaft, 15—Second support shaft, 16—Bearing seat, 17—Lifting guide rail, 18—Guide wheel pair;

[0036] 2—Motor, 21—Synchronous toothed belt, 22—Synchronous pulley;

[0037] 31—First fixed sprocket, 32—Second fixed sprocket, 33—Third fixed sprocket, 34—Keyway;

[0038] 41—First follower sprocket, 42—Second follower sprocket, 43—Copper sleeve structure. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0040] Example 1: In actual use:

[0041] Installation of Lifting Bracket 1: Fix Lifting Bracket 1 in a suitable position, ensuring it is vertically stable. Install the first support shaft 14 and the second support shaft 15 at the top of Lifting Bracket 1 and fix them with bearing seats 16. Install the drive shaft 12 and the driven shaft 13 at the bottom of Lifting Bracket 1 and fix them with bearing sleeves or bearing seats 16.

[0042] Sprocket installation: Two first fixed sprockets 31 are installed at both ends of the drive shaft 12 to transmit power to the chain. A first follower sprocket 41 is installed at one end of the driven shaft 13, and a second fixed sprocket 32 ​​is installed at the other end. The second fixed sprocket 32 ​​acts as a transmission mechanism, driving the driven shaft 13 to rotate, and together with the first fixed sprocket 31 on its side, drives the chain to rotate. The first support shaft 14 and the second support shaft 15 each have a third fixed sprocket 33 installed at one end and a second follower sprocket 42 installed at the other end. This creates a configuration where, except for the drive shaft 12, all other shafts use a combination of fixed and follower sprockets, achieving the effect of mutual adaptation and combined power delivery between the two chains during rotation. The inner ring of the fixed sprocket has a keyway 34, which is used to fix it to the shaft for power transmission. The inner ring of the follower sprocket is a copper sleeve structure 43, which is installed on the shaft and rotates around the shaft as the chain moves.

[0043] Chain Installation: Two sets of chains of equal length are respectively mounted on the sprockets. The first set of chains is mounted between the first fixed sprocket 31, the first follower sprocket 41, and the two third fixed sprockets 33. The second set of chains is mounted between the first fixed sprocket 31, the second fixed sprocket 32, and the two second follower sprockets 42. Ensure that both ends of the chains are connected to the top and bottom surfaces of the lifting platform 11, forming two ring structures. For ease of subsequent maintenance, tensioning mechanisms for each chain can also be installed at appropriate locations. Since tensioning mechanisms are a conventional technique, their structure is not described in this embodiment and is not shown in the figures.

[0044] Installation of motor 2 and synchronous belt: Install motor 2 at the bottom of lifting bracket 1. Install synchronous pulley 22 on drive shaft 12, and connect motor 2 to synchronous pulley 22 via synchronous toothed belt 21.

[0045] Installation of the lifting platform 11: The lifting platform 11 is installed in the middle of the lifting bracket 1. Guide wheels 18 are installed on both sides of the lifting platform 11 and placed on both sides of the lifting guide rail 17. There are four sets of guide wheels 18, one set on the top and one set on each side, which are used to guide and stabilize the lifting process.

[0046] In practical use:

[0047] The first fixed sprocket 31 on the drive shaft 12 drives the sprockets on the driven shaft 13 and support shaft to rotate via a chain. Both ends of the chain are fixed to the lifting platform 11, which moves vertically up and down with the reciprocating rotation of the chain. After a certain number of cycles of operation of the reciprocating chain lifting conveyor, the chains on both sides will stretch to different degrees. A first follower sprocket 41 is provided on the driven shaft 13 to ensure that the slack side of the chain is taut during chain rotation and to easily adjust its tension when the chain stretches. A second follower sprocket 42 is provided on the first support shaft 14 and the second support shaft 15, respectively, opposite to the first follower sprocket 41 on the driven shaft 13. The follower sprocket can rotate circumferentially, rotating with the chain. When the chain rotates, the follower sprocket on the support shaft can adjust the tension of the chain to adapt to the chain on the other side, ensuring the balance of the lifting platform 11. When the chain is stretched to different degrees, the follower chain on the support shaft can prevent the two chains from interacting when tensioned, thus achieving independent tensioning of each chain.

[0048] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A reciprocating double-chain lifting and conveying device, comprising a lifting support (1) and two chains installed at the top and bottom of the lifting support (1), characterized in that... Also includes: The motor (2) is installed at the bottom of the lifting bracket (1) and is connected to the chain through the transmission component, which can drive the chain to rotate in both directions; The lifting platform (11) is installed in the middle of the lifting bracket (1), with its top and bottom surfaces connected to the two ends of the chain respectively, and can be lifted and lowered as the chain pulls. The drive shaft (12) is located on the bottom of the lifting bracket (1) near the motor (2), and both ends are equipped with first fixed sprockets (31). The motor (2) can drive the drive shaft (12) to rotate, and the two first fixed sprockets (31) can rotate with the drive shaft (12). The driven shaft (13) is located on the opposite side of the driving shaft (12), with a second fixed sprocket (32) installed at one end and a first follower sprocket (41) installed at the other end; Two support shafts are installed on the top of the lifting bracket (1). A second follower sprocket (42) is installed on one end of each support shaft, and a third fixed sprocket (33) is installed on the other end. Two sets of chains of equal length are respectively fitted at both ends of the shaft to form a symmetrical installation. One set of chains is fitted between the first fixed sprocket (31), the first follower sprocket (41), and the two third fixed sprockets (33) for transmission and active rotation. The other set of chains is fitted between the first fixed sprocket (31), the second fixed sprocket (32), and the two second follower sprockets (42). Both ends are connected to the top and bottom surfaces of the lifting platform (11), and the chains and the lifting platform (11) form two ring structures. The first follower sprocket (41) and the second follower sprocket (42) can rotate independently relative to the driven shaft (13) and the support shaft, which is a non-fixed, non-transmission connection.

2. The reciprocating double-chain lifting conveyor device according to claim 1, characterized in that, The two support shafts are the first support shaft (14) and the second support shaft (15), wherein the second follower sprockets (42) are on the same end, and the third fixed sprockets (33) are on the other end. The end of the first follower sprocket (41) on the driven shaft (13) is the same end as the second follower sprocket (42), and they are connected and installed with the same chain.

3. The reciprocating double-chain lifting conveyor device according to claim 1, characterized in that, The inner rings of the first follower sprocket (41) and the second follower sprocket (42) are copper sleeve structures (43), which are installed on the driven shaft (13) and the support shaft through the copper sleeve structure (43), and can rotate around the shaft as the chain moves.

4. The reciprocating double-chain lifting conveyor device according to claim 1, characterized in that, The first fixed sprocket (31), the second fixed sprocket (32), and the third fixed sprocket (33) are all provided with keyways (34) on their inner rings. They are installed on the drive shaft (12), the transmission shaft, and the support shaft by key engagement, and are used to transmit power to drive the shaft to rotate.

5. The reciprocating double-chain lifting conveyor device according to claim 1, characterized in that, A synchronous pulley (22) is mounted on the drive shaft (12), and the motor (2) is connected to the synchronous pulley (22) via a synchronous toothed belt (21) to transmit power to the drive shaft (12).

6. The reciprocating double-chain lifting conveyor device according to claim 2, characterized in that, The first support shaft (14) and the second support shaft (15) are both mounted on the top of the lifting bracket (1) via bearing seats (16); both ends of the shafts of the drive shaft (12) and the driven shaft (13) are fixed during installation by mounting bearing sleeves or bearing seats (16).

7. The reciprocating double-chain lifting conveyor device according to claim 1, characterized in that, The lifting bracket (1) is equipped with two vertically arranged lifting guide rails (17). The lifting platform (11) is provided with guide wheels (18) on both sides. The guide wheels (18) are respectively placed on both sides of the lifting guide rails (17). The guide wheels (18) can be limited and guided to roll along the lifting guide rails (17).

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