A guide wheel and tail ring limiting device for a hand chain hoist

Abstract

The utility model discloses a guide pulley and tail ring limiting device for hand chain block relates to hand chain block -related technical field, including guide pulley, the center of guide pulley is equipped with the traction groove, and the both sides of guide pulley respectively detachable connection has the limiting ring to axial, and the limiting ring is connected with the baffle along the radial direction, and both sides baffle is connected with the limiting stop lever along the axial direction, the utility model integrates guide pulley, limiting ring, baffle and limiting stop lever on the same axis and forms the modular structure, and can be integrally disassembled without disassembling guide pulley axle, and the on -the -spot maintenance time is shortened significantly, the split type detachable design makes any part damage can be replaced alone, reduces the spare parts inventory and use cost, and guide pulley axle is used as the positioning reference of limiting ring again as the rotary support, makes guide pulley and limiting ring keep coaxial degree, reduces the running deflection, reduces chain wear and tear and noise, simultaneously utilizes the original guide pulley axle installation site, need not add the hole position in the wallboard, and the existing hand chain block shell is compatible.

Description

Technical Field

[0001] This utility model relates to the technical field of hand chain hoists, and in particular to a guide wheel and tail ring limiting device for hand chain hoists. Background Technology

[0002] A manual chain hoist is a lifting tool that uses human power to pull a chain and lifts or lowers heavy objects through the engagement of a sprocket and chain. It is widely used in equipment installation, warehousing and handling, and hoisting operations in locations without power. In existing manual chain hoists, the guide wheel and tail ring limiting device are both essential key functional components.

[0003] The guide wheel is located above the lifting sprocket, and its outer surface presses against the lifting chain, ensuring that the chain always maintains proper engagement with the sprocket and preventing chain skipping or poor engagement. Currently, the industry generally adopts an integral structure: the blank is cast from gray cast iron or ductile iron, and then manufactured through machining processes such as turning, drilling, and deburring; some products are also made by turning a single bar stock.

[0004] The tail ring limiter is installed at the end of the lifting chain at its travel limit position to prevent the chain from continuing to descend and to prevent the chain from completely slipping off the sprocket, causing the load to fall. Existing tail ring limiters are usually made of cast iron or cast steel.

[0005] In the existing technology, both the guide wheel and the tail ring limiting device are made by casting or integral turning of bar stock. They are independent parts and share the common problems of inconvenient disassembly and assembly and easy damage. Utility Model Content

[0006] Purpose of the invention: The purpose of this invention is to provide a guide wheel and tail ring limiting device for a hand chain hoist, which solves the problem of easy damage to the guide wheel and tail ring limiting device.

[0007] Technical solution:

[0008] A guide wheel and tail ring limiting device for a hand chain hoist, characterized in that it includes a guide wheel, the center of which is provided with a traction groove, and limiting rings are detachably connected to both sides of the guide wheel in the axial direction. The limiting rings are connected to baffles in the radial direction, and the baffles on both sides are connected to limiting stops in the axial direction.

[0009] Preferably, the guide wheel is axially inserted with a guide wheel shaft, and the guide wheel shaft is connected to the limiting rings on both sides.

[0010] Preferably, the guide wheel includes two abutting guide wheel pieces, each guide wheel piece comprising an integrally formed main piece and a secondary piece, the two secondary pieces abutting each other.

[0011] In this embodiment, the two-piece splicing structure allows the traction groove to open radially, enabling the chain to be inserted laterally, eliminating the cumbersome chain threading process; the one-piece molded main piece and auxiliary piece have no weld defects, resulting in higher strength than welded structures, and also requires fewer processing steps and has a high material utilization rate.

[0012] Preferably, the outer diameter of the main piece is larger than the outer diameter of the secondary piece.

[0013] In this embodiment, the main plate forms a large-diameter rim, which can provide a larger limiting surface when the chain sways laterally, reducing the risk of derailment; the reduced diameter of the secondary plate saves material and forms a stepped traction groove, which improves the chain wrap angle and enhances meshing stability.

[0014] Preferably, a step is provided at the connection between the baffle and the limiting ring, and the inner wall of the step and the peripheral wall of the main piece are fitted with a clearance.

[0015] Preferably, the thickness of the baffle is the same as the thickness of the main sheet.

[0016] Preferably, the outer diameter of the limiting ring is the same as the outer diameter of the guide wheel.

[0017] Preferably, both the limiting lever and the two baffles are detachably connected.

[0018] Beneficial effects: Integrating the guide wheel, limiting ring, baffle, and limiting stop bar onto the same axis to form a modular structure allows for complete assembly and disassembly without removing the guide wheel shaft, significantly shortening on-site maintenance time; the split and detachable design allows for individual replacement of any damaged part, reducing spare parts inventory and usage costs; the guide wheel shaft serves as both a rotational support and a positioning reference for the limiting ring, ensuring coaxiality between the guide wheel and the limiting ring, reducing operational runout, chain wear, and noise; and by utilizing the existing guide wheel shaft mounting position, no additional holes need to be added to the wall panel, ensuring compatibility with existing chain hoist housings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this practical tool;

[0020] Figure 2 This is a schematic diagram of the unfolded structure of this utility model.

[0021] Reference numerals: 11. Guide wheel; 12. Guide wheel plate; 13. Main plate; 14. Sub-plate; 15. Through hole; 16. Guide wheel shaft; 17. Restricting ring; 18. Inner hole; 19. Step; 20. Baffle; 21. Mounting hole; 22. Restricting stop bar; 23. Pin. Detailed Implementation

[0022] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, a guide wheel and tail ring limiting device for a hand chain hoist includes a guide wheel 11, which is used to provide rolling support for the traction component.

[0025] The guide wheel 11 provides rolling support for the traction component. The guide wheel 11 is composed of two mirror-symmetrical guide wheel plates 12, which are detachably joined together to form a complete traction groove 20. Each guide wheel plate 12 has an integrally formed main plate 13 and a secondary plate 14. The outer diameter of the main plate 13 is larger than the outer diameter of the secondary plate 14. During assembly, the secondary plates 14 of the two guide wheel plates 12 abut against each other, forming an annular recess on the outer periphery of the secondary plate 14 after assembly. This recess constitutes the bottom of the traction groove 20. The radius of curvature of the groove bottom matches the nominal diameter of the traction component, ensuring that the traction component forms line contact with the groove bottom when under tension, reducing contact stress.

[0026] The center of the guide wheel plate 12 is provided with a through hole 15 along the axial direction. Both guide wheel plates 12 are provided with guide wheel shafts 16 through the through holes 15. The entire device is installed on the hand chain hoist through the guide wheel shafts 16.

[0027] Two limiting rings 17 are connected to the guide wheel shaft 16, located on the outer sides of the two guide wheel plates 12 respectively. Each limiting ring 17 has an inner hole 18 at its center, which is clearance-fitted with the guide wheel shaft 16 to ensure coaxiality and facilitate quick assembly and disassembly. The outer diameter of the limiting ring 17 is equal to the outer diameter of the main plate, making the outer contour of the device a continuous cylindrical surface, reducing the risk of snagging on external obstacles.

[0028] A step 19 is provided on the circumferential surface of the limiting ring 17, and a baffle 20 is connected to the limiting ring 17 at the step 19. The baffle 20 is arranged radially along the limiting ring 17.

[0029] like Figure 2 As shown, the thickness of the main sheet 13 is equal to the thickness of the baffle 20, and the main sheet 13 and the baffle 20 are located on the same horizontal plane to ensure that there is no height difference on the subsequent stepped mating surface and to avoid stress concentration.

[0030] The end of the baffle 20 away from the limiting ring 17 has a through mounting hole 21. A limiting rod 22 is connected in the mounting hole 21. The limiting rod 22 and the two mounting holes 21 are clearance fit, which facilitates the normal sliding of the traction component when it abuts the limiting rod 22 and reduces abutment wear.

[0031] Meanwhile, a nylon rope loop can be fitted at the center of the limiting lever 22 to reduce friction.

[0032] The two ends of the limiting rod 22 pass through two mounting holes 21 respectively. A pin is connected to the limiting rod 22. The length of the pin 23 is greater than the diameter of the mounting hole 21 to achieve clearance fit, which prevents the limiting rod 22 from moving axially without affecting its slight rotation around its own axis. The rounded end of the pin 23 is blunt to avoid scratching the operator.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A sheave and tail ring restraining device for a hand hoist, characterized in that, The device includes a guide wheel, the center of which is provided with a traction groove. The guide wheel is detachably connected to a limiting ring on each of its two axial sides. The limiting ring is connected to a baffle in the radial direction, and the baffles on both sides are connected to a limiting stop bar in the axial direction.

2. The guide wheel and tail ring limiting device for a hand chain hoist according to claim 1, characterized in that, The guide wheel is axially inserted with a guide wheel shaft, and the guide wheel shaft is connected to the limiting rings on both sides.

3. A sheave and tail ring restraining device for a hand hoist according to claim 2, characterised in that, The guide wheel includes two guide wheel plates that abut against each other. Each guide wheel plate includes an integrally formed main plate and a secondary plate, and the two secondary plates abut against each other.

4. The guide wheel and tail ring limiting device for a hand chain hoist according to claim 3, characterized in that, The outer diameter of the main piece is larger than the outer diameter of the secondary piece.

5. The guide wheel and tail ring limiting device for a hand chain hoist according to claim 3, characterized in that, The connection between the baffle and the limiting ring is provided with a step, and the inner wall of the step and the peripheral wall of the main piece are fitted with a clearance.

6. A sheave and tail ring restraining device for a hand hoist according to claim 5, wherein, The thickness of the baffle is the same as the thickness of the main sheet.

7. The sheave and tail ring restraining device for a hand hoist according to claim 1, wherein The outer diameter of the limiting ring is the same as the outer diameter of the guide wheel.

8. The guide wheel and tail ring limiting device for a hand chain hoist according to claim 1, characterized in that, The limiting lever and the two baffles are all detachable.

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