No-dead-corner drag chain mechanism of chain block

Abstract

The dead-corner-free drag chain mechanism of the chain block comprises a machine frame with a containing cavity, a hand chain wheel, a hand chain wheel cover and a follow-up rotating disc, 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, and a thin-wall boss axially extends from one side of the follow-up rotating disc. A flange is formed on the thin-wall boss, at least four notches are axially formed in the circumferential direction at intervals, a groove is formed in the inner circumferential wall of the containing cavity, the thin-wall boss is arranged in the containing cavity, the flange is positioned in the groove, 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, the machining difficulty is lowered, assembly is convenient and efficient, 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 dead angle free chain dragging mechanism of a hand chain hoist, belonging to the technical field of ring chain hand chain hoists. Background Art

[0002] The utility model disclosed by patent No. ZL202021120543.4 is named as a 360-degree rotating hand winch. 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 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 raceway (groove 14) that meets the technical requirements of ball installation. The combined raceway on the body and the bracelet cover has extremely high machining accuracy requirements, otherwise the balls will be stuck and the bracelet cover will be unable to rotate. Furthermore, since the body generally uses aluminum castings, the hardness is much lower than that of the balls. After long-term use, the size of the combined raceway will increase, thereby affecting the rotation flexibility. Utility Model Content

[0005] The utility model aims to provide a chain dragging mechanism without dead angle for a hand chain hoist which is simple to process and easy to assemble.

[0006] To this end, the utility model provides the following technical solutions:

[0007] The hand chain hoist has a dead angle free chain dragging mechanism, comprising 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, and its improvement lies in: it also includes a follower turntable, one side of which has an axially extending thin-walled boss, a thin-walled boss forming flange and at least four axial incisions opened at circumferential intervals, the inner circumferential wall of the cavity is opened with a groove, the thin-walled boss is inserted into the cavity and the flange is axially positioned in the groove, 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 facilitate assembly, the outer diameter of the thin-walled boss is smaller than the diameter of the cavity opening; to improve the fit, the outer diameter of the flange is larger than the inner diameter of the groove.

[0009] In order to avoid extra friction resistance between the hand chain and the chain passage gap and reduce friction noise, 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 wall of the corresponding chain passage gap. After the guide wheels are arranged, the smoothness of the hand chain entering and exiting the chain passage gap is improved, thereby reducing the physical consumption of multi-angle chain dragging by manpower.

[0010] The utility model has the following advantages and positive effects:

[0011] Compared with the prior art, the split structure of the follow-up turntable and the bracelet wheel cover design can simplify the complexities, appropriately reduce the difficulty of processing, and make the assembly convenient and efficient. The bracelet wheel cover has satisfied the function of covering the bracelet wheel, so it can use the industry standard parts with low cost advantages, especially eliminating the hidden dangers of inefficient installation, missing installation and poor rotation of the ball and the ball;

[0012] Since the follower turntable can rotate relative to the frame, when the follower turntable is fixedly connected to the hand chain wheel cover, under the guidance of the human driving direction, the hand chain wheel cover and the follower turntable can be adaptively and synchronously driven to rotate as a whole according to the working conditions. As the angle of the drag chain continues to change, the angle of the chain passage notch of the hand chain wheel cover continuously adapts to the smooth entry and exit of the hand chain, so that the hand chain can well meet the needs of oblique pulling, horizontal pulling or upward pulling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded view of the dead angle-free drag chain mechanism of the hand chain hoist of the utility model;

[0014] Figure 2 It is an axial cross-sectional view of the utility model (before assembling the hand chain wheel and the hand chain). DETAILED DESCRIPTION

[0015] See also Figure 1 , 2As shown, the hand chain hoist has a dead angle-free chain dragging mechanism, including a frame 1 and a hand chain wheel 2 and a hand chain wheel cover 3 respectively located outside the frame. The hand chain wheel 2 cooperates with the transmission thread of the long shaft (the existing structure is not shown) through its inner screw hole. The hand chain wheel 2 is hung with a hand chain 4 and the hand chain passes through a chain passage gap 30 opened at the hand chain wheel cover. There are two chain passage gaps. The improvement is that it also includes a follower turntable 5, and a thin-walled boss 51 is axially extended on one side of the follower turntable 5. The outer peripheral surface of the thin-walled boss 51 has a formed flange 50 to enhance the thin-walled boss 51. Elastic deformation is performed to improve assembly efficiency, so the thin-walled boss 51 is at least circumferentially spaced and axially provided with four cutouts 510 (six are uniformly arranged in this embodiment), the frame 1 has a cavity 10 and the inner circumferential wall of the cavity is provided with a groove 100, the thin-walled boss 51 is inserted into the cavity 100 and the flange 50 is axially positioned in the groove 100 under the elastic deformation of the thin-walled boss 51, the bracelet wheel cover 3 is fixedly connected to the outer end face of the follower turntable 5, the bracelet wheel 2 is located between the follower turntable 5 and the bracelet wheel cover 3 and is covered by the bracelet wheel cover.

[0016] The outer diameter of the thin-walled boss 51 is smaller than the diameter of the cavity opening 10 ; the outer diameter of the flange 50 is larger than the inner diameter of the groove 100 .

[0017] A guide wheel 6 is rotatably arranged between the hand chain wheel cover and the follower turntable, and the two guide wheels are respectively adjacent to the top wall of the corresponding chain passage gap.

Claims

1. A chain hoist with no dead angle chain dragging mechanism, comprising 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 provided at the hand chain wheel cover, characterized in that: It also includes a follower turntable, one side of which has a thin-walled boss axially extending therefrom, a thin-walled boss forming a flange and at least four axial cuts spaced circumferentially therefrom, the inner circumferential wall of the cavity being provided with a groove, the thin-walled boss being inserted into the cavity and the flange being axially positioned in the groove, a sprocket wheel cover being fixedly connected to the outer end face of the follower turntable, the sprocket wheel being located between the follower turntable and the sprocket wheel cover and being covered by the sprocket wheel cover.

2. The hand chain hoist without dead angle chain dragging mechanism according to claim 1 is characterized in that: The outer diameter of the thin-walled boss is smaller than the diameter of the cavity opening; the outer diameter of the flange is larger than the inner diameter of the groove.

3. The hand chain hoist without dead angle dragging mechanism according to claim 1 or 2, 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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