Chain lifting device and electric chain hoist

Abstract

The invention relates to the technical field of lifting machinery, and provides a chain lifting device and an electric chain hoist, the chain lifting device comprises a chain wheel, a chain, an outer contour limiting device and a shell, and the chain wheel is used for being connected with a driving shaft; the other end of the chain is positioned on the other side of the chain wheel after bypassing the chain wheel; the outer contour limiting device is arranged on the side, away from the chain wheel, of the chain along the rotating path of the chain and used for limiting the outer ring track of the rotating path of the chain. The outer contour limiting device is sleeved with the shell, and the shell is used for limiting the outer contour limiting device. According to the chain lifting device provided by the invention, the shell is arranged on the outer side of the outer contour limiting device, and the limitation of factors such as chain wheel design experience and high-precision chain manufacturing requirements in the aspect of chain and chain wheel production design can be broken through on the premise of ensuring no chain clamping and no chain falling on the basis that the shell powerfully supports the outer contour limiting device; the economic benefit is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lifting machinery, and in particular to a chain lifting device and an electric chain hoist. Background Art

[0002] Electric chain hoists are widely used in the production and manufacturing processes of industry, chemical industry, shipbuilding and construction. Electric chain hoists can lift components from the ground to high altitudes or lower them to the ground through the rotation of chains. However, when the load is too heavy and the lifting speed is too fast, electric chain hoists often have problems with chain jamming and chain derailment.

[0003] The prior art provides a completely floating anti-chain jam device, which uses a completely floating shell to tightly wrap the rotation path of the chain from the outside of the chain to achieve the function of preventing the chain from jamming. However, this anti-chain jam device can only rely entirely on the design experience of the sprocket and the high-precision chain manufacturing level. If there is an error in either of the two, such as welding deformation of the chain, manufacturing errors of the chain or the sprocket, these errors will cause the anti-chain jam device to fail, which brings a huge burden on production costs. Summary of the invention

[0004] The first aspect of the present invention provides a chain lifting device to solve the defect of low upper error limit of the anti-chain jamming device in the prior art. By arranging a shell on the outside of the outer contour limiting device, based on the strong support of the outer contour limiting device by the shell, it is possible to break the limitations of sprocket design experience and high-precision chain manufacturing requirements on chain and sprocket production design under the premise of ensuring that the chain does not jam or fall off, thereby greatly reducing the production cost of chains and sprockets and improving economic benefits.

[0005] A second aspect of the present invention provides an electric chain hoist.

[0006] The chain lifting device provided by the present invention comprises: A sprocket, used for connecting with a drive shaft; A chain, one end of which is located on one side of the sprocket, and the other end of which is located on the other side of the sprocket after passing around the sprocket; An outer contour limiting device is arranged along the rotation path of the chain and on a side of the chain away from the sprocket, and the outer contour limiting device is used to limit the outer circle track of the rotation path of the chain; The outer shell is sleeved on the outer side of the outer contour limiting device and is used to limit the outer contour limiting device.

[0007] According to the chain lifting device provided by the present invention, the gap between the inner contour of the outer shell and the outer contour of the outer contour limiting device is a, wherein the value range of a is: 1mm≤a≤2mm.

[0008] According to the chain lifting device provided by the present invention, the gap between the inner contour of the outer contour limiting device and the outer circle trajectory of the rotation path of the chain is b, wherein the value range of b is: 0.5≤b≤1mm.

[0009] The chain lifting device provided by the present invention further comprises at least one chain guide column, and the bottom plate of the housing is provided with two through holes; In the case where two chain guide posts are provided, one of the two chain guide posts is provided in one of the two through holes, and the other of the two chain guide posts is provided in the other of the two through holes, and the other end of the chain enters the interior of the housing from one of the through holes and one of the chain guide posts, bypasses the sprocket, and leaves the housing from the other through hole and the other chain guide post; In the case where one chain guide post is provided, the chain guide post is provided in one of the two through holes, and the other end of the chain enters the interior of the outer shell from one of the through holes and the chain guide post, bypasses the sprocket, and leaves the outer shell from the other through hole; or, the other end of the chain enters the interior of the outer shell from one of the through holes, bypasses the sprocket, and leaves the outer shell from the chain guide post and the other through hole.

[0010] According to the chain lifting device provided by the present invention, the chain guide column is penetrated through the through hole and matched with the through hole gap, the gap is c, wherein the value range of c is: 0.2≤c≤0.4mm.

[0011] The chain lifting device provided according to the present invention further includes a retaining spring, the outer surface of the chain guide column is provided with a retaining spring groove matching the retaining spring, and the retaining spring cooperates with the bottom plate of the shell to limit the axial displacement of the chain guide column.

[0012] According to the chain lifting device provided by the present invention, the width of the retaining spring groove is d, wherein the value range of d is: D+0.2≤d≤D+0.4mm, and D is the standard value of the retaining spring groove width.

[0013] The chain lifting device provided by the present invention further comprises an inner contour limiting device and a floating plate, wherein the floating plate is fixed below the outer contour limiting device and is in floating contact with the chain guide column; The inner contour limiting device is arranged between the floating plate and the sprocket, and the inner contour limiting device is used to limit the inner circle of the chain rotation path.

[0014] According to the chain lifting device provided by the present invention, the heat treatment hardness of the sprocket, the outer contour limiting device and the inner contour limiting device is e, wherein the value range of e is: 34HRC≤e≤38HRC.

[0015] The electric chain hoist provided by the present invention comprises the chain lifting device described in any one of the above items.

[0016] In the chain lifting device provided by the present invention, an outer contour limiting device is provided, so that when the sprocket drives the chain to rotate, the outer contour limiting device can constrain and limit the outer circle trajectory of the chain rotation path; further, an outer shell is provided to limit and constrain all the outer shapes of the outer contour limiting device. Under the rigid limiting action of the outer shell on the outer contour limiting device, the position deformation of the outer contour limiting device can be avoided. At the same time, the outer shell can provide sufficient support for the outer contour limiting device. Under such strong support, the outer contour limiting device can stably limit each link of the chain in a predetermined rotation path, and can effectively limit the rolling (tilting) displacement of each link of the chain, thereby avoiding the problem of excessive superposition of the total displacement of the chain.

[0017] In addition, due to the dual restrictions of the outer contour limit device and the outer shell, the chain ring can be stably pressed into the chain nest, which can prevent the chain ring from escaping from the chain nest, thereby ensuring the stability of power transmission between the chain ring and the sprocket, ensuring the safety of the sprocket and chain structure, and avoiding the occurrence of chain jamming and chain derailment problems.

[0018] Compared with the anti-chain jamming device in the prior art, the chain lifting device provided by the present invention, by arranging a shell on the outer side of the outer contour limiting device, based on the strong support of the outer contour limiting device by the shell, can break the limitations of sprocket design experience and high-precision chain manufacturing requirements on chain and sprocket production design under the premise of ensuring that the chain does not jam or fall off. In other words, the chain lifting device provided by the present invention improves the upper limit of the error in the production design of the chain and sprocket, and can allow a larger error range. Even if the chain has a certain welding deformation, or there is a large manufacturing error between the sprocket and the chain, the chain lifting device provided by the present invention can also ensure that there will be no problems of chain jamming and chain falling off, which can greatly reduce the production cost of the chain and sprocket and improve the economic benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the partial structure of the chain lifting device provided in an embodiment of the present invention.

[0021] Figure 2It is an axial schematic diagram of a chain lifting device provided in an embodiment of the present invention.

[0022] Figure 3 It is a schematic cross-sectional structure diagram of a chain lifting device provided in an embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the exploded structure of the chain lifting device provided in an embodiment of the present invention.

[0024] Figure 5 It is a structural schematic diagram of an electric chain hoist provided in an embodiment of the present invention.

[0025] Reference numerals: 10: motor; 20: speed reducer; 30: chain lifting device; 100: sprocket; 200: chain; 300: outer contour limiting device; 400: housing; 500: chain guide column; 510: retaining spring groove; 600: retaining spring; 700: inner contour limiting device; 800: floating plate; 900: limiting plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0028] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] Electric chain hoists are widely used in the production and manufacturing processes of industry, chemical industry, shipbuilding, and construction. Taking wind turbines as an example, electric chain hoists are generally installed in the cabin on the top of the wind turbine. During use, electric chain hoists can be used for operation and maintenance, and replacement of components in the cabin. Through the rotation and lifting of the chain, new components can be lifted from the ground to the cabin at high altitude, and the old components can be replaced and lowered to the ground.

[0031] When the rated load is light and the lifting speed is slow, the functions of the electric chain hoist are mostly normal. However, when the rated load is heavy and the lifting speed is fast, the electric chain hoist often has problems with chain jamming and chain derailment, which will cause the electric chain hoist to lose its lifting function. If the load is lifted to mid-air, the load will be suspended in mid-air, which is very dangerous for on-site construction. In addition, since the weight of the load is all on the chain, it is difficult to directly repair the electric chain hoist. The only way to repair the electric chain hoist is to use a crane to lift (unload) the load in mid-air. This chain jamming problem greatly increases the danger, working time and cost of wind turbine operation and maintenance.

[0032] Figure 1 It is a schematic diagram of the partial structure of the chain lifting device provided in an embodiment of the present invention.

[0033] See also Figure 1 , the specific reasons why the chain 200 is unfastened or stuck are explained below.

[0034] During the movement, the chain ring of the chain 200 will be embedded in the chain hole of the sprocket 100. When the sprocket 100 rotates, the chain ring of the chain 200 will be driven to rotate together, thereby driving the movement of the entire chain 200. Since the chain 200 is generally subjected to unidirectional force (only one side hangs the hanging object), the chain ring of the chain 200 is a circular ring body, and the chain hole of the sprocket 100 is an inner concave arc surface, when the sprocket 100 rotates clockwise or counterclockwise, the chain ring of the chain 200 and the chain hole of the sprocket 100 will present a power transmission form of inscribed circle contact.

[0035] For the sake of convenience of explanation, this article takes the example of the sprocket 100 rotating counterclockwise to lower the hanging object and the sprocket 100 rotating clockwise to lift the hanging object as an example for illustration. The above example is not a specific limitation of the embodiment of the present invention. The corresponding relationship between the rotation direction of the sprocket 100 and the lifting process of the hanging object can be adaptively designed according to actual conditions.

[0036] When the sprocket 100 rotates counterclockwise (to lower the load), the rotation direction of the sprocket 100 is the same as the direction of the load on the chain 200 (the load applied to the chain 200 by the load), and the left end of the horizontal chain ring (as shown in the figure, for ease of understanding, this article takes the chain ring in a horizontal state directly above the sprocket 100 as an example for explanation) is subjected to the load and will always abut against the left end of the chain nest below it. Therefore, the left end of the horizontal chain ring always has a rolling friction force in the counterclockwise direction (this conclusion is determined by the force analysis experiment), and the general direction of the force here is toward the upper left of the chain ring; at the same time, due to the inertia generated when the sprocket 100 rotates counterclockwise, the right end of the horizontal chain ring will be subjected to a force to the upper left; further, as Figure 1 As shown, the two forces to the upper left are superimposed, which will cause the right end of the horizontal chain link to produce a displacement in the counterclockwise direction (rolling displacement in the counterclockwise direction). In other words, this will cause the right end of the horizontal chain link to produce a rolling displacement to the upper left with its own left end as the center of the circle.

[0037] Since this displacement is large, if there is no good constraint, combined with the two inherent displacements of the chain ring itself (the clearance displacement between the chain ring and the chain nest and the acceleration difference displacement of the chain 200), the total displacement of the chain ring will be accumulated along each chain ring clockwise as the sprocket 100 drives the chain 200 to rotate, and the total displacement will become larger and larger, and the total displacement will eventually make the 4 o'clock direction (such as Figure 1 The left end of the flat chain ring (in the A direction) goes beyond the top of the chain nest (chain off), which makes the power transmission between the chain ring and the sprocket 100 invalid, and the chain 200 cannot continue to rotate with the sprocket 100. This phenomenon is chain jamming.

[0038] The above total displacement can be illustrated by the following formula.

[0039] S 逆 =S1+S2+S3 Among them, S 逆 It represents the total displacement of the chain link; S1 represents the clearance displacement between the chain link and the chain nest; S2 represents the rolling displacement of the chain link from the right end to the upper left with the left end as the center; S3 represents the acceleration difference displacement.

[0040] It should be noted that the gap displacement between the chain link and the chain socket specifically refers to: the distance between the end of the chain link and the end of the chain socket, that is, the remaining space after the chain socket accommodates the chain link. When the chain link is subjected to unilateral force, the chain link will move toward the end on the other side of the chain socket, and then abut against the end of the chain socket. In this process, the distance moved by the chain link is the gap displacement. This displacement can be controlled, for example, by changing the size of the chain socket or the size of the chain link, or by changing the chamfer of the end of the chain socket.

[0041] The acceleration difference displacement specifically refers to: when the chain 200 and the sprocket 100 are in the separation and combination positions, there is an angular velocity difference between the two, which will cause a certain position difference between the chain ring and the chain nest when they are engaged, and this position is the acceleration displacement difference.

[0042] The prior art provides a completely floating anti-chain jam device, which uses a completely floating shell to tightly wrap the rotation path of the chain from the outside of the chain to achieve the function of preventing the chain from jamming. However, this anti-chain jam device can only rely entirely on the design experience of the sprocket and the high-precision chain manufacturing level. If there is an error in either of the two, such as welding deformation of the chain, manufacturing errors of the chain or the sprocket, these errors will cause the anti-chain jam device to fail, which brings a huge burden on production costs.

[0043] Figure 2 is an axial schematic diagram of a chain lifting device provided in an embodiment of the present invention; Figure 3 is a schematic cross-sectional structure diagram of a chain lifting device provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the exploded structure of the chain lifting device provided in an embodiment of the present invention.

[0044] See also Figure 2 , Figure 3 and Figure 4 A first aspect of an embodiment of the present invention provides a chain lifting device 30, which can be driven by a motor 10 or a manual rotation device. Specifically, it can be adaptively designed according to actual conditions; the chain lifting device 30 includes a sprocket 100, a chain 200, an outer contour limiting device 300 and a housing 400.

[0045] The sprocket 100 is an annular structure. A circle of sprocket teeth and grooves are circumferentially arranged on the outer side of the sprocket 100. The groove is the aforementioned chain nest. The inner ring of the sprocket 100 is circumferentially arranged with a power transmission structure. The power transmission structure can be a keyway, a key or a gear structure, etc. The sprocket 100 is used to connect with the drive shaft. During operation, the drive shaft can drive the sprocket 100 to rotate in a predetermined direction. The drive shaft can be the output shaft of the motor 10 or the output shaft of the reduction device 20, or it can be a manual rotation device.

[0046] The chain 200 is composed of a plurality of chain links connected end to end, one end of the chain 200 is located on one side of the sprocket 100, and the other end is located on the other side of the sprocket 100 after passing the sprocket 100. Objects may be suspended at both ends of the chain 200, or only at one end. When objects are suspended at only one end of the chain 200, the two sides of the chain 200 may be defined as a load-bearing strand and a load-free strand, respectively. As the name implies, the load-bearing strand is the chain 200 on the side on which the object is suspended, and the load-free strand is the chain 200 on the side on which the object is not suspended. The load-free strand may hang freely, or a chain storage device may be provided for storage.

[0047] The outer contour limiting device 300 is a semi-annular structure, and the shape of the inner circle of the outer contour limiting device 300 is a door opening shape, and matches the shape of the side of the chain 200 rotation path away from the sprocket 100. The outer contour limiting device 300 is used to limit the outer circle trajectory of the chain 200 rotation path; the shape of the outer circle trajectory of the outer contour limiting device 300 matches the shape of the outer shell 400, and can be a trapezoid as shown in the figure, or it can be a circle or square, etc.

[0048] The outer shell 400 is sleeved on the outside of the outer contour limiting device 300. The outer shell 400 is used to limit the outer contour limiting device 300. The outer shell 400 includes a bottom plate, a top plate, a back plate and two side plates. The top plate and the bottom plate are relatively arranged at the upper and lower ends of the back plate, and the two side plates are relatively arranged between the bottom plate and the top plate. In an optional example of the present invention, the outer shell 400 also includes a cover plate, which is relatively arranged with the back plate.

[0049] See also Figure 3 and Figure 4 It can be understood that, in the chain lifting device 30 provided in the embodiment of the present invention, by setting the outer contour limiting device 300, when the sprocket 100 drives the chain 200 to rotate, the outer contour limiting device 300 can constrain and limit the outer circle trajectory of the rotation path of the chain 200; further, by setting the outer shell 400, all the outer shapes of the outer contour limiting device 300 are limited and constrained. Under the rigid limiting action of the outer contour limiting device 300 by the outer shell 400, the position deformation of the outer contour limiting device 300 can be avoided. At the same time, the outer shell 400 can provide sufficient support for the outer contour limiting device 300. Under such strong support, the outer contour limiting device 300 can stably limit each link of the chain 200 in the predetermined rotation path, and can effectively limit the rolling (tilting) displacement of each link of the chain 200, thereby avoiding the problem of excessive superposition of the total displacement of the chain 200.

[0050] In addition, due to the dual restrictions of the outer contour limit device 300 and the outer shell 400, the chain ring can be stably pressed into the chain nest, which can prevent the chain ring from escaping from the chain nest, thereby ensuring the stability of power transmission between the chain ring and the sprocket 100, ensuring the safety of the structure of the sprocket 100 and the chain 200, and avoiding the occurrence of chain jamming and chain derailment problems.

[0051] Compared with the anti-chain jamming device in the prior art, the chain lifting device 30 provided in the embodiment of the present invention, by setting a shell 400 on the outer side of the outer contour limiting device 300, based on the strong support of the outer contour limiting device 300 by the shell 400, can break the limitations of the sprocket 100 design experience and the high-precision chain 200 manufacturing requirements on the production design of the chain 200 and the sprocket 100 under the premise of ensuring that the chain does not jam or derail, in other words, the chain lifting device 30 provided in the embodiment of the present invention improves the upper limit of the error in the production design of the chain 200 and the sprocket 100, and can allow a larger error range. Even if the chain 200 has a certain welding deformation, or the sprocket 100 and the chain 200 have a large manufacturing error, the chain lifting device 30 provided in the embodiment of the present invention can also ensure that there will be no problems of chain jamming and chain derailment, which can greatly reduce the production cost of the chain 200 and the sprocket 100, and improve the economic benefit.

[0052] Continue reading Figure 3 and 4 In an optional embodiment of the present invention, the gap between the inner contour of the shell 400 and the outer contour of the outer contour limiting device 300 is a, wherein the value range of a is: 1mm≤a≤2mm, for example, a can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.9mm or 2mm; it can be understood that by limiting the gap between the inner contour of the shell 400 and the outer contour of the outer contour limiting device 300 within the above value range, a certain activity space can be given to the outer contour limiting device 300. In other words, a certain amount of displacement can be given to the outer contour limiting device 300. In this way, during the rotation of the chain 200, the displacement of the outer contour limiting device 300 can effectively absorb the impact force of the chain 200 on the outer contour limiting device 300, and reduce the impact force of the outer contour limiting device 300 on the shell 400, thereby reducing the vibration and noise of the equipment. This design can effectively improve the overall operation stability of the chain lifting device 30 and extend the service life of the device.

[0053] Continue reading Figure 3 and 4In an optional embodiment of the present invention, in an optional embodiment of the present invention, the gap between the inner contour of the outer contour limiting device 300 and the outer circle trajectory of the rotation path of the chain 200 is b, wherein the value range of b is: 0.5≤b≤1mm, for example, b can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm; it can be understood that by limiting the gap between the inner contour of the outer contour limiting device 300 and the outer circle trajectory of the rotation path of the chain 200 within the above value range, it can be effectively The angular velocity error of the joint between the chain ring and the chain socket of the sprocket 100 and the angular velocity error when the chain ring and the chain socket of the sprocket 100 are separated can be constrained accurately. In other words, the aforementioned acceleration difference displacement can be effectively constrained, thereby reducing the total displacement of the chain ring; in addition, the precise gap can also accurately control the movement trajectory of the chain 200 during the transmission process, ensuring good engagement between the chain 200 and the sprocket 100. This precise control helps to reduce the rolling (tilting) displacement of the chain 200 on the sprocket 100, thereby avoiding the problems of chain jamming and chain derailment.

[0054] Continue reading Figure 3 and 4 In an optional embodiment of the present invention, at least one chain guide column 500 is further included. At the same time, two through holes are provided on the bottom plate of the housing 400. The two through holes correspond to the load-bearing strand and the load-free strand of the chain 200 respectively. The chain 200 can enter and exit the housing 400 through the two through holes. The chain guide column 500 is a hollow structure. Preferably, a chain guide column with a through cross groove can be selected. The through cross groove matches the shape of the chain 200, which can well constrain the state of the chain 200 after entering the housing 400.

[0055] In the case where two chain guide posts 500 are provided, one of the two chain guide posts 500 is provided in one of the two through holes, i.e. corresponding to one of the load-bearing strands and the load-free strands of the chain 200, and the other of the two chain guide posts 500 is provided in the other of the two through holes, i.e. corresponding to the other of the load-bearing strands and the load-free strands of the chain 200. One end of the chain 200 is located on the outside of the outer shell 400, and the other end passes through one of the through holes and one of the chain guide posts 500 and enters the interior of the outer shell 400. Furthermore, the other end of the chain 200 passes through the other through hole and the other chain guide post 500 after bypassing the sprocket 100, and leaves the outer shell 400.

[0056] In the case where only one guide chain post 500 is provided, the guide chain post 500 is provided in one of the two through holes. This situation includes two settings. First, one end of the chain 200 is located outside the outer shell 400, and the other end of the chain 200 passes through the through hole provided with the guide chain post 500 and the guide chain post 500 to enter the interior of the outer shell 400. Further, the other end of the chain 200 will leave the outer shell 400 from another through hole after bypassing the sprocket 100; second, one end of the chain 200 is located outside the outer shell 400, and the other end of the chain 200 enters the interior of the outer shell 400 from the through hole where the guide chain post 500 is not provided. Further, the other end of the chain 200 will leave the outer shell 400 from another through hole and the guide chain post 500 after bypassing the sprocket 100.

[0057] Continue reading Figure 3 and 4 It can be understood that, in the chain lifting device 30 provided in the embodiment of the present invention, by providing the chain guide column 500, the movement path of the chain 200 can be guided when the chain 200 enters and exits the outer shell 400, which can facilitate the connection and separation of the chain 200 and the sprocket 100, and at the same time can reduce the chain jamming problem when the chain 200 enters and exits the outer shell 400; in addition, the chain guide column 500 can prevent the chain 200 from directly contacting the bottom plate of the outer shell 400, which can reduce the wear of the bottom plate of the outer shell 400, thereby increasing the service life of the outer shell 400.

[0058] Continue reading Figure 3 and 4 In an optional embodiment of the present invention, the guide chain post 500 is penetrated through the interior of the through hole and cooperates with the gap of the through hole, and the gap between the two is c, wherein the value range of c is: 0.2≤c≤0.4mm, for example, c can be 0.2mm, 0.3mm, or 0.4mm; it can be understood that by limiting the gap between the guide chain post 500 and the through hole within the above-mentioned value range, the guide chain post 500 can have a certain variable displacement at the through hole, and further, the variable displacement can make the guide chain post 500 swing freely and controllably in a plane perpendicular to its own axis. When the chain 200 passes through the guide chain post 500 in and out of the outer shell 400, this controllable swinging displacement can effectively alleviate the impact of the chain 200 on the guide chain post 500, and at the same time can avoid the rigid connection between the guide chain post 500 and the bottom plate of the outer shell 400, thereby avoiding the chain jamming problem caused by the rigid connection.

[0059] Continue reading Figure 3 and 4In an optional embodiment of the present invention, the chain lifting device 30 also includes a retaining spring 600. At one end of the guide chain column 500 facing the bottom plate of the outer shell 400, a retaining spring groove 510 matching with the retaining spring 600 is provided on the outer surface of the guide chain column 500. There are two retaining spring grooves 510, which are respectively located on the upper and lower sides of the bottom plate. After assembly is completed, the displacement of the guide chain column 500 along its own axial direction can be limited by the abutment between the retaining spring 600 and the bottom plate of the outer shell 400.

[0060] In an optional embodiment of the present invention, the guide chain column 500 can also be axially limited by a nut or an annular boss provided on the outer surface of the guide chain column 500. In other words, the retaining spring 600 can be replaced by a nut or an annular boss. Specifically, it can be adaptively set according to actual conditions.

[0061] In an optional embodiment of the present invention, the width of the retaining spring groove 510 is d, wherein the value range of d is: D+0.2≤d≤D+0.4mm, D is the standard value of the width of the retaining spring groove 510, and the standard value here refers to the reference value given in the mechanical design manual GB / T894.1-1986 specification. For example, when the national standard recommendation of the retaining spring groove 510 is 1.3, the value range of d in this embodiment is: 1.3+0.2≤d≤1.3+0.4mm; when the national standard recommendation of the retaining spring groove 510 is 1.7, the value range of d in this embodiment is: 1.7+0.2≤d≤1.7+0.4mm.

[0062] It can be understood that by limiting the width of the retaining ring groove 510 within the above-mentioned range of values, the guide chain column 500 can have a certain variable displacement in the axial direction. In this way, when the chain 200 passes through the guide chain column 500, the variable displacement can cause the guide chain column 500 to move in the axial direction to a certain extent. This controllable displacement can offset the impact of part of the chain 200 on the guide chain column 500, reduce the mutual wear between the chain 200 and the guide chain column 500, and at the same time avoid the rigid connection between the guide chain column 500 and the bottom plate of the outer shell 400, thereby avoiding the chain jamming problem caused by the rigid connection.

[0063] In addition, based on the clearance fit between the chain guide post 500 and the through hole in the aforementioned embodiment, the chain 200 can also have a certain automatic alignment function at the chain guide post 500. Specifically, when the chain 200 is stuck at the chain guide post 500, since the chain guide post 500 can perform a certain axial movement and controllable swing, the chain 200 will not be completely stuck, and the chain 200 can still have a certain movable space in the stuck state. By pulling or lowering the chain 200 by the sprocket 100, there is a great probability that the chain 200 can be out of the stuck state, that is, the chain 200 can have a certain alignment function at the chain guide post 500. Based on this, the risk of the chain 200 being stuck can be effectively reduced, and the stability of the chain lifting device 30 can be improved.

[0064] Continue reading Figure 3 and 4 In an optional embodiment of the present invention, it also includes an inner contour limiting device 700 and a floating plate 800. The floating plate 800 is fixed below the outer contour limiting device 300 and is in floating contact with the upper end of the chain guide column 500. The inner contour limiting device 700 is arranged between the floating plate 800 and the sprocket 100. The inner contour limiting device 700 is used to limit the inner circle of the rotation path of the chain 200.

[0065] It should be noted that floating contact means that the floating plate 800 is only overlapped with the chain guide column 500, and there is no connection relationship between the two. It can be understood that based on the aforementioned outer contour limiting device 300, sprocket 100, chain guide column 500 and the through hole on the bottom plate of the shell 400, two mutually connected channels, namely the load channel and the no-load channel, can be limited inside the shell 400. The load channel corresponds to the load-bearing strand of the aforementioned chain 200, and the no-load channel corresponds to the no-load strand of the aforementioned chain 200. The load channel and the no-load channel can limit the load-bearing strand and the no-load strand of the chain 200 respectively, and can strongly limit the rotation path of the chain 200. Each link of the chain 200 can be stably limited in the predetermined rotation path, and the safety of the sprocket 100 chain 200 structure can be ensured to avoid the occurrence of chain jamming and chain derailment.

[0066] In addition, by setting up the floating plate 800, on the one hand, it can be used to support the inner contour limit device 700, and on the other hand, it can make the outer contour limit device 300 and the inner contour limit device 700 have a certain floatation in the internal space of the outer shell 400, that is, the outer contour limit device 300 and the inner contour limit device 700 can have a certain controllable displacement. In this way, during the rotation of the chain 200, the outer contour limit device 300 and the inner contour limit device 700 can offset part of the impact and load from the chain 200 through their own controllable displacement. In this way, the wear between the chain 200, the outer contour limit device 300 and the inner contour limit device 700 can be reduced, and the service life of the chain 200, the outer contour limit device 300 and the inner contour limit device 700 can be improved, that is, the durability of the chain lifting device 30 can be improved.

[0067] The connection between the outer contour limiting device 300 and the inner contour limiting device 700 and the floating plate 800 can be welded, connected with fasteners or clamped, etc., and can be adaptively set according to actual conditions. In an optional embodiment of the present invention, the inner contour limiting device 700 is a trapezoidal structure, and the cross-section of the inner contour limiting device 700 gradually increases from the sprocket 100 to the floating plate 800. This arrangement allows the inclined surface of the inner contour limiting device 700 to better limit the moving path of the chain 200.

[0068] In an optional embodiment of the present invention, the heat treatment hardness of the sprocket 100, the outer contour limiting device 300 and the inner contour limiting device 700 is e, wherein the value range of e is: 34HRC≤e≤38HRC, for example, e can be 34HRC, 35HRC, 36HRC, 37HRC or 38HRC. It can be understood that the heat treatment hardness of the sprocket 100, the outer contour limiting device 300 and the inner contour limiting device 700 is limited to the above value range. When the chain 200 is connected with the sprocket 100, the outer contour limiting device 300 and the inner contour limiting device 700, the heat treatment hardness of the sprocket 100, the outer contour limiting device 300 and the inner contour limiting device 700 is limited to the above value range. 00 contacts the inner limit device, the sprocket 100, the outer contour limit device 300 and the inner contour limit device 700 can effectively alleviate the vibration of the chain 200 through their own deformation, which can well compensate for the manufacturing error of the chain 200 and avoid the noise and vibration generated when the chain 200 is engaged with the chain nest, thereby avoiding the impact of the vibration of the chain 200 on the suspended object, and improving the smoothness and stability of the lifting process and parking of the suspended object. At the same time, it can also increase the service life of the chain 200, that is, increase the service life of the chain lifting device 30.

[0069] Compared with the high hardness of the sprocket 100, the outer contour limit device 300 and the inner contour limit device 700 in the prior art, limiting the heat treatment hardness of the sprocket 100, the outer contour limit device 300 and the inner contour limit device 700 within the above-mentioned value range can reduce the difficulty of producing and manufacturing the sprocket 100, the outer contour limit device 300 and the inner contour limit device 700, thereby improving the production efficiency of the chain lifting device 30.

[0070] Continue reading Figure 3 and 4 In an optional embodiment of the present invention, a limit plate 900 is further included. The limit plate 900 is arranged on the front and rear surfaces of the outer contour limit device 300. Through the abutment and cooperation between the limit plate 900 and the tooth portion of the sprocket 100, the displacement of the outer contour limit device 300 and the inner contour limit device 700 along the axial direction of the sprocket 100 can be limited, that is, the structural stability between the outer contour limit device 300, the inner contour limit device 700 and the floating plate 800 and the sprocket 100 can be ensured, and the outer contour limit device 300 and other components can be prevented from slipping out of the sprocket 100.

[0071] Figure 5 It is a structural schematic diagram of an electric chain hoist provided in an embodiment of the present invention.

[0072] See also Figure 5 According to a second aspect of an embodiment of the present invention, an electric chain hoist is provided, comprising a motor 10, a reduction gear 20, and a chain lifting device 30 as described in any one of the aforementioned embodiments. The output shaft of the motor 10 is connected to the reduction gear 20, and the output shaft of the reduction gear 20 is connected to the sprocket 100 of the chain lifting device 30. In other words, in this embodiment, the output shaft of the reduction gear 20 is the driving shaft in the aforementioned embodiment. During operation, the motor 10 drives the reduction gear 20 to rotate, and the reduction gear 20 thereby drives the sprocket 100 and the chain 200 to rotate; the housing of the reduction gear 20 and the housing 400 in the aforementioned embodiment are independent components. During assembly, the chain lifting device 30 can enter the interior of the housing of the reduction gear 20 from the opening at the bottom of the housing of the reduction gear 20, and be adaptively connected to the reduction gear 20; in an optional embodiment of the present invention, the housing of the reduction gear 20 can also be an integrated structure with the housing 400 of the chain lifting device 30. Specifically, it can be adaptively selected according to actual conditions.

[0073] It can be understood that the electric chain hoist provided in the embodiment of the present invention includes the chain lifting device 30 in any of the aforementioned embodiments, and therefore also has the technical effects of the chain lifting device 30 in any of the aforementioned embodiments. Specifically, the technical effects of the electric chain hoist can be found in the foregoing description, which will not be elaborated in this article.

[0074] It should be noted that the technical solutions in various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present invention.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chain lifting device, characterized in that: include: A sprocket, used for connecting with a drive shaft; A chain, one end of which is located on one side of the sprocket, and the other end of which is located on the other side of the sprocket after passing around the sprocket; An outer contour limiting device is arranged along the rotation path of the chain and on a side of the chain away from the sprocket, and the outer contour limiting device is used to limit the outer circle track of the rotation path of the chain; The outer shell is sleeved on the outer side of the outer contour limiting device and is used to limit the outer contour limiting device.

2. The chain lifting device according to claim 1, characterized in that: The gap between the inner contour of the shell and the outer contour of the outer contour limiting device is a, wherein the value range of a is: 1mm≤a≤2mm.

3. The chain lifting device according to claim 1, characterized in that: The gap between the inner contour of the outer contour limiting device and the outer circle track of the rotation path of the chain is b, wherein the value range of b is: 0.5≤b≤1mm.

4. The chain lifting device according to any one of claims 1 to 3, characterized in that: It also includes at least one chain guide post, and the bottom plate of the housing is provided with two through holes; In the case where two chain guide posts are provided, one of the two chain guide posts is provided in one of the two through holes, and the other of the two chain guide posts is provided in the other of the two through holes, and the other end of the chain enters the interior of the housing from one of the through holes and one of the chain guide posts, bypasses the sprocket, and leaves the housing from the other through hole and the other chain guide post; In the case where one chain guide post is provided, the chain guide post is provided in one of the two through holes, and the other end of the chain enters the interior of the outer shell from one of the through holes and the chain guide post, bypasses the sprocket, and leaves the outer shell from the other through hole; or, the other end of the chain enters the interior of the outer shell from one of the through holes, bypasses the sprocket, and leaves the outer shell from the chain guide post and the other through hole.

5. The chain lifting device according to claim 4, characterized in that: The chain guide column is passed through the through hole and is matched with the through hole gap, the gap is c, wherein the value range of c is: 0.2≤c≤0.4mm.

6. The chain lifting device according to claim 4, characterized in that: It also includes a retaining spring, the outer surface of the chain guide column is provided with a retaining spring groove matching the retaining spring, and the retaining spring cooperates with the bottom plate of the shell to limit the axial displacement of the chain guide column.

7. The chain lifting device according to claim 6, characterized in that: The width of the retaining spring groove is d, wherein the value range of d is: D+0.2≤d≤D+0.4mm, and D is the standard value of the retaining spring groove width.

8. The chain lifting device according to claim 4, characterized in that: It also includes an inner contour limiting device and a floating plate, wherein the floating plate is fixed below the outer contour limiting device and is in floating contact with the chain guide column; The inner contour limiting device is arranged between the floating plate and the sprocket, and the inner contour limiting device is used to limit the inner circle of the chain rotation path.

9. The chain lifting device according to claim 8, characterized in that: The heat treatment hardness of the sprocket, the outer contour limiting device and the inner contour limiting device is e, wherein the value range of e is: 34HRC≤e≤38HRC.

10. An electric chain hoist, characterized in that: A chain lifting device comprising any one of claims 1 to 9.

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