Chain block

Abstract

The utility model belongs to the technical field of chain blocks, and discloses a chain block which comprises a lifting hook, a shell, a rotating shaft, a hand chain wheel, a ratchet mechanism, a lifting chain wheel and a transmission mechanism, the shell is provided with a fixing hole, the fixing hole is configured to be rotationally connected with a lifting shaft of the lifting hook, the design of a guide chain wheel is omitted, the overall sealing performance is improved, and the service life of the chain block is prolonged. The rotating shaft is rotationally arranged in the shell, the hand chain wheel is rotationally arranged on the rotating shaft and can drive the rotating shaft to rotate, the ratchet wheel is arranged on the rotating shaft in a sleeving mode, the two pawls are arranged on the two sides of the ratchet wheel in the circumferential direction of the ratchet wheel, the two pawls are connected with the ratchet wheel in a meshed mode, and the lifting chain wheel is arranged on the rotating shaft in a sleeving mode; the transmission mechanism is in transmission connection with the rotating shaft and the hoisting chain wheel, when the hand chain wheel slides down accidentally, the ratchet wheels are clamped by the pawls, goods on the hoisting chain wheel are prevented from falling off, the overall mechanical performance of the chain block cannot be affected by arranging the two pawls, and the chain block is safe, reliable and reasonable in structural design.

Description

Technical Field

[0001] The utility model relates to the technical field of chain hoists, in particular to chain hoists. Background Art

[0002] A chain hoist is a simple and portable manual hoisting machine. It uses a ring chain as a hoisting flexible part, which can not only lift objects vertically but also pull objects horizontally. It is suitable for installing machines and lifting goods in factories, mines, construction sites, docks, warehouses and other places. Especially in open-air and power-free operations, its superiority can be more prominent. It is often used for short-distance hoisting of small equipment and goods. The existing chain hoist has a large size due to the setting of a guide sprocket, and its structure is relatively loose. Impurities such as dust and sediment are easy to fall into the gearbox, affecting the overall quality. At the same time, during the hoisting process, if the pawl fails to work, the goods will fall rapidly, resulting in poor safety and reliability.

[0003] Therefore, there is an urgent need for a chain hoist to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a chain hoist, which solves the problems of large volume, poor sealing performance caused by the setting of a guide sprocket in the traditional chain hoist, and the problem of goods falling and poor safety and reliability caused by the failure of the pawl during the hoisting process.

[0005] In order to solve the above problems existing in the prior art, the utility model adopts the following technical solutions:

[0006] A chain hoist, comprising:

[0007] A hook;

[0008] A housing, the housing is provided with a fixing hole, and the fixing hole is configured to be rotationally connected with the suspension shaft of the hook;

[0009] A rotating shaft, the rotating shaft is rotatably arranged in the housing;

[0010] A hand chain wheel, the hand chain wheel is rotatably arranged on the rotating shaft and can drive the rotating shaft to rotate;

[0011] A ratchet mechanism, the ratchet mechanism includes a ratchet wheel and two pawls. The ratchet wheel is sleeved on the rotating shaft. Along the circumferential direction of the ratchet wheel, the two pawls are arranged on both sides of the ratchet wheel, and both of the two pawls are meshed and connected with the ratchet wheel;

[0012] A hoisting sprocket, the hoisting sprocket is sleeved on the rotating shaft;

[0013] A transmission mechanism, the transmission mechanism is arranged in the housing, and the transmission mechanism is in transmission connection with the rotating shaft and the hoisting sprocket.

[0014] Preferably, the housing includes a housing body, a sprocket cover and a gear cover. The sprocket cover and the gear cover are respectively arranged at the two open ends of the housing body, and the housing body has a symmetrical structure.

[0015] Preferably, the chain block further includes a first baffle and a second baffle. The first baffle and the second baffle are sleeved on the lifting sprocket, and along the axial direction of the rotating shaft, the first baffle and the second baffle are respectively fixedly arranged on both sides of the housing body, and the pawl is rotatably arranged on the first baffle.

[0016] Preferably, the chain block further includes a first connecting member. A first mounting hole is formed on one side of the housing body, and a connecting hole is formed on the gear cover. The first connecting member passes through the connecting hole and is connected to the first mounting hole.

[0017] Preferably, the chain block further includes a second connecting member. A second mounting hole is formed on the other side of the housing body, and a through hole is formed on the sprocket cover. The second connecting member passes through the through hole and is connected to the second mounting hole.

[0018] Preferably, the transmission mechanism includes two spur gears and a flower wheel. The flower wheel is meshed and connected with the external teeth of the lifting sprocket. Along the circumferential direction of the rotating shaft, the two spur gears are located on both sides of the rotating shaft and are rotatably arranged on the second baffle, and both of the two spur gears are meshed and connected with the external teeth of the flower wheel and the rotating shaft.

[0019] Preferably, the transmission mechanism further includes a positioning plate. A groove is formed on the housing, and the positioning plate is clamped in the groove. The positioning plate is provided with a plurality of positioning holes, and the plurality of positioning holes are configured to be rotatably connected with the rotating shaft and the two spur gears.

[0020] Preferably, the chain block further includes a brake seat. The brake seat is sleeved on the rotating shaft, the inner ring of the brake seat is meshed and connected with the rotating shaft, and the outer ring of the brake seat is meshed and connected with the hand chain wheel.

[0021] Preferably, the brake seat protrudes with a limiting portion. Along the axial direction of the rotating shaft, the ratchet is clamped between the housing and the limiting portion.

[0022] Preferably, the housing is made of aluminum material.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The chain hoist provided by the utility model has a fixed hole opened on the outer shell, and the fixed hole is configured to be rotationally connected with the suspension shaft of the hook. The design of the guide sprocket is cancelled, and the overall sealing performance is improved, so that sediment, dust and the like can be prevented from entering the outer shell, the service life of the chain hoist is prolonged, and the overall structural volume is reduced, making it small, light and portable. The rotating shaft is rotatably arranged in the outer shell, and the bracelet wheel is rotatably arranged on the rotating shaft and can drive the rotating shaft to rotate. The ratchet mechanism includes a ratchet and two pawls. The ratchet is sleeved on the rotating shaft. Along the circumferential direction of the ratchet, the two pawls are arranged on both sides of the ratchet, and both pawls are meshed with the ratchet. The lifting sprocket is sleeved on the rotating shaft, and the transmission mechanism is arranged in the outer shell and is in transmission connection with the rotating shaft and the lifting sprocket. When the bracelet wheel accidentally slips, the pawl locks the ratchet to prevent the goods on the lifting sprocket from falling. By arranging two pawls, even if one pawl is damaged and does not work, the other pawl will cooperate with the ratchet to continue working, which will not affect the overall mechanical performance of the chain hoist. It is safe and reliable, operates stably, and has a reasonable structural design. Brief Description of the Drawings

[0025] Figure 1 is an exploded view of the chain hoist provided by the embodiment of the utility model Figure 1 ;

[0026] Figure 2 is an exploded view of the chain hoist provided by the embodiment of the utility model Figure 2 ;

[0027] Figure 3 is a structural schematic diagram of the chain hoist provided by the embodiment of the utility model;

[0028] Figure 4 is a front view of the chain hoist provided by the embodiment of the utility model;

[0029] Figure 5 is a sectional view of the chain hoist provided by the embodiment of the utility model.

[0030] Reference Signs:

[0031] 1, hook; 2, outer shell; 3, fixed hole; 4, rotating shaft; 5, bracelet wheel; 6, ratchet; 7, pawl; 8, lifting sprocket; 9, housing; 10, sprocket cover; 11, gear cover; 12, first baffle; 13, second baffle; 14, first connecting piece; 15, second connecting piece; 16, spur gear; 17, flower wheel; 18, positioning plate; 19, groove; 20, positioning hole; 21, brake seat. Detailed Description of the Embodiment

[0032] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model and not for limiting the present utility model. Additionally, it should be noted that for the sake of convenience in description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] Such as Figures 1-5As shown, in this embodiment, the chain block includes a hook 1, a housing 2, a rotating shaft 4, a hand chain wheel 5, a ratchet 6 mechanism, a hoisting sprocket 8, and a transmission mechanism. Among them, the housing 2 is provided with a fixing hole 3 which is configured to be rotatably connected to the suspension shaft of the hook 1. The rotating shaft 4 is rotatably arranged inside the housing 2. The hand chain wheel 5 is rotatably arranged on the rotating shaft 4 and can drive the rotating shaft 4 to rotate. The ratchet 6 mechanism includes a ratchet 6 and two pawls 7. The ratchet 6 is sleeved on the rotating shaft 4. Along the circumferential direction of the ratchet 6, the two pawls 7 are arranged on both sides of the ratchet 6, and both of the two pawls 7 are meshed and connected with the ratchet 6. The hoisting sprocket 8 is sleeved on the rotating shaft 4. The transmission mechanism is arranged inside the housing 2 and is in transmission connection with the rotating shaft 4 and the hoisting sprocket 8. Specifically, the housing 2 is provided with a fixing hole 3 corresponding to the suspension shaft position of the hook 1. The hook 1 is connected to the housing 2 through the fixing hole 3, and the design of the guide sprocket is cancelled, so that the overall sealing performance is improved, thereby avoiding the entry of sediment, dust, etc. into the housing 2 and prolonging the service life of the chain block. The rotating shaft 4 is located in the inner cavity of the housing 2 and is rotationally matched with the housing 2. Along the axial direction of the rotating shaft 4, a hand chain wheel 5, a ratchet 6 mechanism, a hoisting sprocket 8, and a transmission mechanism are arranged in sequence. Among them, the hand chain wheel 5 is fixedly sleeved on the rotating shaft 4. The rotating shaft 4 can rotate relative to the housing 2 under the drive of the hand chain wheel 5. The ratchet 6 is sleeved on the rotating shaft 4 and can rotate synchronously with the hand chain wheel 5. The number of the pawls 7 is two. The two pawls 7 are respectively arranged on both sides of the ratchet 6 and are both meshed and connected with the ratchet 6. During the use process, even if one of the pawls 7 is damaged and does not work, the other pawl 7 will cooperate with the ratchet 6 to continue working, without affecting the overall mechanical performance of the chain block, which is safe and reliable. The hoisting sprocket 8 is sleeved on the rotating shaft 4, and the inner ring of the hoisting sprocket 8 is spaced from the outer peripheral surface of the rotating shaft 4. The transmission mechanism is located inside the housing 2. The hoisting sprocket 8 is in power transmission with the rotating shaft 4 through the transmission mechanism. The working process of the chain block is as follows: The operator pulls the hand chain of the hand chain wheel 5, and the hand chain drives the hand chain wheel 5 to rotate. The hand chain wheel 5 drives the rotating shaft 4 to rotate. At the same time, it drives the ratchet 6 to rotate synchronously. The two pawls 7 are disengaged or engaged with multiple teeth of the unidirectionally rotating ratchet 6. The rotating shaft 4 drives the hoisting sprocket 8 to drive the goods to rise through the transmission mechanism. When the hand chain wheel 5 accidentally slips, the pawl 7 locks the ratchet 6 to prevent the goods on the hoisting sprocket 8 from falling. By setting two pawls 7, the overall mechanical performance of the chain block is ensured, which is safe and reliable. This chain block runs stably, with a reasonable structural design. The internal structure of the housing 2 has been optimized, and the design of the guide sprocket has been cancelled, resulting in a reduction in the overall structural volume, making it small and portable.

[0037] Further, continue to refer to Figures 1-5, the housing 2 includes a housing body 9, a sprocket cover 10 and a gear cover 11. The sprocket cover 10 and the gear cover 11 are respectively arranged at the two open ends of the housing body 9, and the housing body 9 has a symmetrical structure. Specifically, the housing body 9 is provided with two fixing holes 3, and the two fixing holes 3 are symmetrically arranged for fixing the two ends of the suspension shaft of the lifting hook 1. The chain hoist further includes a first connecting member 14 and a second connecting member 15. The two sides of the housing body 9 are respectively provided with a first mounting hole and a second mounting hole. The gear cover 11 is provided with a connecting hole, and the sprocket cover 10 is provided with a through hole. The first connecting member 14 passes through the connecting hole and is connected to the first mounting hole, and the second connecting member 15 passes through the through hole and is connected to the second mounting hole, so that the gear cover 11 and the sprocket cover 10 are respectively installed and fixed at the two ends of the housing body 9 through the first connecting member 14 and the second connecting member 15, forming a closed housing 2, which has good sealing performance and is convenient for installing and disassembling each component of the chain hoist.

[0038] Further, with continued reference to Figures 1-5 , the chain hoist further includes a first baffle 12 and a second baffle 13. The first baffle 12 and the second baffle 13 are sleeved on the lifting sprocket 8, and along the axial direction of the rotating shaft 4, the first baffle 12 and the second baffle 13 are respectively fixedly arranged on the two sides of the housing body 9. The pawl 7 is rotatably arranged on the first baffle 12. Specifically, the first baffle 12 is located between one side of the housing body 9 and the ratchet wheel 6, and the second baffle 13 is located between the other side of the housing body 9 and the transmission mechanism. The first baffle 12 and the second baffle 13 play a role in limiting and can limit the lifting sprocket 8 on the housing body 9.

[0039] Further, with continued reference to Figures 1-5 , the transmission mechanism includes two spur gears 16 and a flower wheel 17. The flower wheel 17 is meshed and connected with the external teeth of the lifting sprocket 8. Along the circumferential direction of the rotating shaft 4, the two spur gears 16 are located on both sides of the rotating shaft 4 and are rotatably arranged on the second baffle 13, and both spur gears 16 are meshed and connected with the external teeth of the flower wheel 17 and the rotating shaft 4. Specifically, when an operator pulls the bracelet of the hand sprocket 5, the bracelet drives the bracelet wheel 5 to rotate, the bracelet wheel 5 drives the rotating shaft 4 to rotate, the rotating shaft 4 drives the two spur gears 16 to rotate, the spur gears 16 drive the flower wheel 17 to rotate, and the flower wheel 17 drives the lifting sprocket 8 to rotate and can drive the goods to rise, with stable transmission.

[0040] Further, with continued reference to Figures 1-5 , the transmission mechanism further includes a positioning plate 18. The housing 2 is provided with a groove 19, and the positioning plate 18 is clamped in the groove 19. The positioning plate 18 is provided with a plurality of positioning holes 20, and the plurality of positioning holes 20 are configured to be rotationally connected with the rotating shaft 4 and the two spur gears 16. Specifically, the positioning plate 18 is clamped and fixed in the groove 19 of the gear cover 11. The positioning plate 18 is provided with three positioning holes 20. The middle positioning hole 20 is used for supporting and fixing the rotating shaft 4, and the two positioning holes 20 on both sides are used for supporting and fixing the two spur gears 16, and the positioning plate 18 is separable from the gear cover 11, which is convenient for disassembly.

[0041] Further, with continued reference to Figures 1-5 , the chain hoist further includes a brake seat 21 sleeved on the rotating shaft 4. The inner ring of the brake seat 21 is meshed and connected with the rotating shaft 4, and the outer ring of the brake seat 21 is meshed and connected with the hand chain wheel 5. Specifically, the brake seat 21 is clamped between the ratchet wheel 6 and the rotating shaft 4, that is, the ratchet wheel 6 is sleeved on the rotating shaft 4 through the brake seat 21. An operator pulls the hand chain of the hand sprocket 5, and the hand chain drives the hand chain wheel 5 to rotate. The power of the hand chain wheel 5 is transmitted to the rotating shaft 4 and the ratchet wheel 6 through the brake seat 21, so as to realize the power transmission of the lifting sprocket 8.

[0042] Further, with continued reference to Figures 1-5 , the brake seat 21 is convexly provided with a limiting portion. Along the axial direction of the rotating shaft 4, the ratchet wheel 6 is clamped between the housing 2 and the limiting portion. Specifically, along the axial direction of the rotating shaft 4, the rotating shaft 4 is sequentially provided with the ratchet wheel 6, the limiting portion and the first baffle 12, and the limiting portion is used to abut the ratchet wheel 6 against the end face of the hand chain wheel 5.

[0043] Further, with continued reference to Figures 1-5 , the housing 2 is made of aluminum material. Specifically, compared with the traditional steel housing 2, it is lighter in weight and relatively smaller in size, ensuring that the lifting speed of the goods is accelerated, which is beneficial for the operator to easily hang it up, saving time and effort. At the same time, it is also convenient for the operator to easily carry the manual hoist.

[0044] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A hand chain hoist, characterized in that: include: Hook (1); A housing (2), the housing (2) being provided with a fixing hole (3), the fixing hole (3) being configured to be rotatably connected to the hanging shaft of the hanging hook (1); A rotating shaft (4), the rotating shaft (4) being rotatably disposed in the housing (2); A hand chain wheel (5), the hand chain wheel (5) is rotatably arranged on the rotating shaft (4) and can drive the rotating shaft (4) to rotate; A ratchet (6) mechanism, the ratchet (6) mechanism comprising a ratchet (6) and two ratchet pawls (7), the ratchet (6) being sleeved on the rotating shaft (4), the two ratchet pawls (7) being arranged on both sides of the ratchet (6) along the circumferential direction of the ratchet (6), and the two ratchet pawls (7) being meshed and connected with the ratchet (6); A lifting sprocket (8), wherein the lifting sprocket (8) is sleeved on the rotating shaft (4); A transmission mechanism is arranged in the housing (2), and the transmission mechanism is in transmission connection with the rotating shaft (4) and the lifting sprocket (8).

2. The hand chain hoist according to claim 1, characterized in that: The housing (2) comprises a shell (9), a sprocket cover (10) and a gear cover (11); the sprocket cover (10) and the gear cover (11) are respectively arranged at two end openings of the shell (9); and the shell (9) is a symmetrical structure.

3. The hand chain hoist according to claim 2, characterized in that: The hand chain hoist also includes a first baffle (12) and a second baffle (13), wherein the first baffle (12) and the second baffle (13) are sleeved on the lifting sprocket (8), and along the axial direction of the rotating shaft (4), the first baffle (12) and the second baffle (13) are respectively fixedly arranged on both sides of the shell (9), and the ratchet (7) is rotatably arranged on the first baffle (12).

4. The hand chain hoist according to claim 2, characterized in that: The hand chain hoist also includes a first connecting member (14), a first mounting hole is opened on one side of the shell (9), and a connecting hole is opened on the gear cover (11), and the first connecting member (14) passes through the connecting hole and is connected to the first mounting hole.

5. The hand chain hoist according to claim 2, characterized in that: The hand chain hoist also includes a second connecting member (15), a second mounting hole is opened on the other side of the shell (9), and a through hole is opened on the sprocket cover (10), and the second connecting member (15) passes through the through hole and is connected to the second mounting hole.

6. The hand chain hoist according to claim 3, characterized in that: The transmission mechanism comprises two plate gears (16) and a flower wheel (17), wherein the flower wheel (17) is meshedly connected with the external teeth of the lifting sprocket (8), and along the circumferential direction of the rotating shaft (4), the two plate gears (16) are located on both sides of the rotating shaft (4) and are rotatably arranged on the second baffle (13), and the two plate gears (16) are both meshedly connected with the flower wheel (17) and the external teeth of the rotating shaft (4).

7. The hand chain hoist according to claim 6, characterized in that: The transmission mechanism also includes a positioning plate (18), the housing (2) is provided with a groove (19), the positioning plate (18) is snap-fitted into the groove (19), the positioning plate (18) is provided with a plurality of positioning holes (20), and the plurality of positioning holes (20) are configured to be rotationally connected to the rotating shaft (4) and the two blade gears (16).

8. The hand chain hoist according to claim 1, characterized in that: The hand chain hoist also includes a brake seat (21), which is sleeved on the rotating shaft (4), the inner ring of the brake seat (21) is meshed and connected with the rotating shaft (4), and the outer ring of the brake seat (21) is meshed and connected with the hand chain wheel (5).

9. The hand chain hoist according to claim 8, characterized in that: The brake seat (21) is provided with a limiting portion protruding therefrom, and along the axial direction of the rotating shaft (4), the ratchet (6) is clamped between the housing (2) and the limiting portion.

10. The hand chain hoist according to claim 1, characterized in that: The housing (2) is made of aluminum material.

Images