Chain block capable of freely rotating

Abstract

The utility model discloses a chain block capable of rotating freely, which comprises a machine frame with a containing cavity, a hand chain wheel, a hand chain wheel cover, a follow-up rotating disc and a steel wire baffle ring, and a hand chain is hung on the hand chain wheel and penetrates out of a chain passing notch formed in the position of the hand chain wheel cover. One side of the follow-up rotating disc axially extends to form a boss and a groove I, the groove depth of the groove I is larger than the diameter of the steel cable baffle ring, the inner circumferential wall of the containing cavity is provided with a groove II, the boss is arranged in the containing cavity, the steel cable baffle ring is located in the groove I and the groove II respectively, the hand chain wheel cover is fixedly connected to the outer end face of the follow-up rotating disc, and the hand chain wheel is located between the follow-up rotating disc and the hand chain wheel cover. By the adoption of the scheme, the follow-up rotating disc and the hand chain wheel cover which are of a split structure can be simplified in design, machining difficulty is reduced, assembling is convenient and efficient, the steel wire check rings serve as positioning, limiting and connecting parts, the axial structure is compact, and the hidden dangers of low-efficiency installation, neglected installation and unsmooth rotation of balls are abandoned; and the requirements of inclined pulling, horizontal pulling or upward pulling are met.

Description

Technical Field

[0001] The utility model relates to a freely rotatable hand chain hoist, belonging to the technical field of chain hand chain hoists. Background Art

[0002] The utility model disclosed by patent number ZL202021120543.4 is named a 360-degree rotating hand hoist. The single-part bracelet cover 3 has a groove I4. Multiple balls 2 are installed one by one through the plug 7 and are circumferentially distributed in the groove I4. The balls 2 roll in cooperation with the groove II5 of the fuselage 1 so that the bracelet cover 3 can rotate relative to the fuselage.

[0003] A careful analysis of the above structure reveals the following technical deficiencies:

[0004] There are a large number of balls and they need to be installed manually one by one, which leads to low work efficiency and the risk of missing balls. On the basis of the conventional structure bracelet cover 3, a boss needs to be added, and the boss is provided with a rolling path (groove 14) that meets the technical requirements of ball installation. The combined rolling paths on the body and the bracelet cover have extremely high processing precision requirements, otherwise the balls will be stuck and the bracelet cover will be unable to rotate. Moreover, since the body generally adopts aluminum castings, the hardness is much lower than that of the balls. After long-term use, the size of the combined rolling path will increase, thereby affecting the rotation flexibility. Utility Model Content

[0005] The utility model aims to provide a freely rotatable hand chain hoist which is simple to manufacture, compact in structure, convenient to assemble and low in cost.

[0006] To this end, the present invention adopts the following technical solutions:

[0007] A freely rotatable hand chain hoist comprises a frame with a cavity, a hand chain wheel and a hand chain wheel cover, the hand chain wheel is hung with a hand chain and the hand chain passes through a chain passage gap opened at the hand chain wheel cover, the improvement of the hand chain hoist is that it also comprises a follower turntable and a wire retaining ring, one side of the follower turntable is axially extended with a boss and a groove I opened on the boss with a groove depth greater than the diameter of the wire retaining ring, a groove II is opened on the inner peripheral wall of the cavity, the boss is inserted into the cavity and the wire retaining ring is respectively located in groove I and groove II, the hand chain wheel cover is fixedly connected to the outer end face of the follower turntable, the hand chain wheel is located between the follower turntable and the hand chain wheel cover and is covered by the hand chain wheel cover.

[0008] To prevent additional friction between the hand chain and the chain passage notch and reduce friction noise, guide wheels are installed between the hand chain wheel cover and the follower turntable. The two guide wheels are located adjacent to the top wall of the corresponding chain passage notch. The installation of the guide wheels improves the smoothness of the hand chain's entry and exit from the chain passage notch, thereby reducing damage to the hand chain caused by multi-angle drag.

[0009] The utility model has the advantages and positive effects that:

[0010] Compared with the prior art, the follow-up turntable and the hand sprocket cover of the split structure can simplify the design, appropriately reduce the processing difficulty and facilitate the assembly, and the hand sprocket cover can meet the function of covering the hand sprocket, so that the hand sprocket cover can adopt an industry standard part with low cost advantage, and the hidden troubles of the ball and the inefficient installation, missing installation and poor rotation of the ball are abandoned.

[0011] The steel wire retainer is used as a positioning, limiting and connecting part, the axial structure is compact and convenient to install, the follow-up turntable can rotate relative to the rack, and the follow-up turntable and the hand sprocket cover are fixedly connected, under the guidance of the driving direction, the follow-up turntable and the hand sprocket cover can be integrally rotated synchronously according to the working condition, and the angle of the chain passing gap of the hand sprocket cover can be continuously adapted to the smooth entry and exit of the zipper chain under the continuous change of the chain angle, so that the zipper chain can meet the needs of the inclined pulling, horizontal pulling or upward pulling operation. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the explosion drawing of the utility model;

[0013] Figure 2 is the axial sectional view (before the hand sprocket and the zipper chain are assembled) of the utility model. DETAILED DESCRIPTION

[0014] Please refer to Figure 1 、 2 , a freely rotatable hand chain block, which comprises a rack 1 and a hand sprocket 2 and a hand sprocket cover 3 located outside the rack respectively, the hand sprocket 2 is connected with a long shaft (not shown in the prior art) through the internal screw hole and threaded connection, the hand sprocket is hung with a zipper chain 4 and the zipper chain passes through the chain passing gap 30 formed in the hand sprocket cover 3, the chain passing gap has two, and the improvement point lies in that the hand chain block further comprises a follow-up turntable 5 and a steel wire retainer 6, the follow-up turntable is axially extended with a boss 51 on one side, the boss is provided with a groove I 50, the groove I 50 has a groove depth greater than the diameter of the steel wire retainer 6, the rack 1 has a cavity 10 and the inner circumferential wall of the cavity is provided with a groove II 100, the boss 51 is placed into the cavity 10 and the steel wire retainer 6 is located in the groove I 50 and the groove II 100 respectively, the hand sprocket cover 3 is fixedly connected to the outer end face of the follow-up turntable 5, and the hand sprocket 2 is located between the follow-up turntable 5 and the hand sprocket cover 3 and is covered by the hand sprocket cover 3.

[0015] In order to facilitate assembly, the outer diameter of the boss 51 is less than the diameter of the cavity opening of the cavity 10. When the boss enters the cavity opening, the steel wire retainer is elastically compressed and then completely falls into the groove I; when the steel wire retainer is moved to the groove II, the elastic recovery of the steel wire retainer is located in the groove I and the groove II respectively.

[0016] Rotatably interposed between the hand sprocket 3 and the follower carousel 5 are guide rollers 7, one on each side of the top wall of the respective chain passage aperture 30.

Claims

1. A freely rotatable hand chain hoist comprising a frame with a cavity, a hand chain wheel and a hand chain wheel cover, wherein the hand chain wheel is hung with a hand chain and the hand chain passes through a chain passage notch provided in the hand chain wheel cover, characterized in that: It also includes a follow-up turntable and a wire retaining ring. A boss and a groove I with a depth greater than the diameter of the wire retaining ring are axially extended on one side of the follow-up turntable. A groove II is provided on the inner circumferential wall of the cavity. The boss is placed in the cavity and the wire retaining ring is respectively located in groove I and groove II. The bracelet wheel cover is fixedly connected to the outer end face of the follow-up turntable. The bracelet wheel is located between the follow-up turntable and the bracelet wheel cover and is covered by the bracelet wheel cover.

2. The freely rotatable hand chain hoist according to claim 1, characterized in that: Guide wheels are arranged between the hand chain wheel cover and the follower turntable, and the two guide wheels are respectively adjacent to the top walls of the corresponding chain passage gaps.

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