Overload protection device for chain block
By designing an anti-overload protection device in a hand-pulled hoist, using structures such as worm gear and partition plate, the problem of pawl breaking during overload is solved, and the safety and user experience of cargo are improved.
Patent Information
- Application Number
- CN202421146312.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-24
AI Technical Summary
When the hand-pulled hoist is overloaded, the pawls are prone to breaking under high pressure, resulting in damage to the cargo.
An anti-overload protection device is designed, including a first shell and a second shell, which penetrates the five-tooth long shaft inside, is equipped with a bracelet, a gear, a worm and a rotating rod, and the five-tooth long shaft is braked by a worm gear and worm. , reduce pawl pressure and separate the bracelet through a partition plate and threaded rod to avoid wrapping.
It effectively reduces the pressure of the pawl, avoids breakage, improves the safety of the cargo, and improves the user experience, prevents the bracelet from wrapping.
Smart Images
Figure CN222249850U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hand chain hoists, in particular to an anti-overload protection device for hand chain hoists. Background Art
[0002] A chain hoist is a manual lifting machine widely used in many fields, such as factories, mines, agriculture, construction sites, docks, etc. Its main function is to lift goods and hoisting equipment, especially suitable for situations where there is no power supply or the site is small. The structure of a chain hoist usually includes a ring chain system, which is manually operated to control the tension or relaxation of the chain to achieve the lifting or lowering of heavy objects. This equipment is not only simple to use, but also easy to carry, suitable for short-distance lifting operations; in addition, the chain hoist can be used in conjunction with a monorail trolley to form a lifting and transport trolley for monorail overhead transportation or other specific lifting tasks. In different application scenarios, the chain hoist can improve work efficiency, reduce labor intensity, and ensure the safety of goods.
[0003] The hand chain hoist in the prior art usually uses a ratchet and a pawl for braking, so that the goods can be stopped in the air without reversing. However, when the hand chain hoist is overloaded, the pawl is subjected to a large pressure and is prone to breakage, causing damage to the goods. Utility Model Content
[0004] In order to solve the problem that the ratchet is prone to breakage due to a large pressure, the utility model aims to provide an anti-overload protection device for a hand chain hoist.
[0005] To solve the above technical problems, the utility model adopts the following technical solutions: an anti-overload protection device for a hand chain hoist, comprising a first shell and a second shell, a five-tooth long shaft is rotated and penetrated inside the first shell and the second shell together, a hand chain wheel is provided inside the second shell, the five-tooth long shaft is fixedly penetrated through the hand chain wheel, a first gear is fixedly sleeved on the outer side of the five-tooth long shaft, the top of the first gear is meshedly connected with the second gear, the middle of the second gear is fixedly penetrated with an extension rod, the extension rod is rotatably installed on the inner wall of the second shell, a worm is fixedly installed on one end of the extension rod close to the hand chain wheel, the top of the worm is meshedly connected with a worm wheel, the middle of the worm wheel is fixedly penetrated with a rotating rod, the top of the second shell is fixedly penetrated with symmetrically distributed support rods, and the two ends of the rotating rod are respectively rotatably installed in the corresponding support rods.
[0006] Preferably, two stabilizing plates are fixedly installed on the bottom end of the second shell, and the two stabilizing plates are distributed in a mirror image. The lower surface of the inner wall of the stabilizing plate is slidably provided with symmetrically distributed partition plates, and a connecting plate is commonly fixedly installed on the opposite sides of the two partition plates. A threaded rod is rotatably penetrated through the bottom of the stabilizing plate, and the thread of the threaded rod passes through the connecting plate.
[0007] Compared with the prior art, the beneficial effects of the utility model are:
[0008] 1. The present application can brake the five-tooth long shaft by setting a worm gear, thereby reducing the pressure on the pawl, avoiding the pawl from breaking, and improving the safety of the goods;
[0009] 2. This application can separate the two ends of the bracelet to avoid entanglement of the bracelet during use, thereby improving the user experience of the staff. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0012] Figure 2 It is a schematic diagram of the structure inside the second shell of the utility model.
[0013] Figure 3 It is a structural schematic diagram of the partition plate in the utility model.
[0014] In the figure: 1. first shell; 11. second shell; 12. five-tooth long shaft; 13. hand chain wheel; 14. first gear; 15. second gear; 16. extension rod; 17. worm; 18. worm wheel; 19. rotating rod; 191. support rod; 2. stabilizing plate; 21. partition plate; 22. connecting plate; 23. threaded rod; 3. limit rod; 4. stabilizing rod; 41. stabilizing groove; 5. observation window; 6. connecting ring. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] Example: Figure 1-3As shown in the figure, the utility model provides an overload protection device for a chain block, which includes a first housing 1 and a second housing 11. A five-tooth long shaft 12 is rotatably penetrated through the interiors of the first housing 1 and the second housing 11. A bracelet wheel 13 is arranged inside the second housing 11. The five-tooth long shaft 12 fixedly penetrates through the bracelet wheel 13. A first gear 14 is fixedly sleeved on the outer side of the five-tooth long shaft 12. A second gear 15 is meshed and connected to the top of the first gear 14. An extension rod 16 is fixedly penetrated through the middle of the second gear 15. The extension rod 16 is rotatably installed on the inner wall of the second housing 11. A worm 17 is fixedly installed at one end of the extension rod 16 close to the bracelet wheel 13. A worm gear 18 is meshed and connected to the top of the worm 17. A rotating rod 19 is fixedly penetrated through the middle of the worm gear 18. Symmetrically distributed support rods 191 are fixedly penetrated through the top of the second housing 11. Two ends of the rotating rod 19 are respectively rotatably installed in the corresponding support rods 191.
[0017] Two stabilizing plates 2 are fixedly installed at the bottom end of the second housing 11. The two stabilizing plates 2 are mirror-symmetrically distributed. Symmetrically distributed partition plates 21 are slidably arranged on the lower surface of the inner wall of the stabilizing plate 2. A connecting plate 22 is fixedly installed on the relative sides of the two partition plates 21. A threaded rod 23 is rotatably penetrated through the bottom of the stabilizing plate 2. The threaded rod 23 threadedly penetrates through the connecting plate 22.
[0018] Symmetrically distributed limiting rods 3 are fixedly installed on the inner wall of the stabilizing plate 2. Both of the two limiting rods 3 penetrate through the connecting plate 22. By arranging the limiting rods 3, the stability of the connecting plate 22 during movement is improved, and it is prevented from shifting during movement.
[0019] Symmetrically distributed stabilizing rods 4 are fixedly installed at the bottom ends of the two partition plates 21. Two groups of symmetrically distributed stabilizing grooves 41 are formed on the lower surface of the inner wall of the stabilizing plate 2. Multiple stabilizing rods 4 are respectively movably clamped in the corresponding stabilizing grooves 41. By arranging the stabilizing rods 4 and the stabilizing grooves 41, the stability of the partition plate 21 during movement is further improved, so as to better separate the hand chain.
[0020] An observation window 5 is fixedly installed on the top of the second housing 11. By arranging the observation window 5, it is convenient to check the situation inside the second housing 11; the observation window 5 is made of a transparent material to achieve visualization for the staff.
[0021] A connecting ring 6 is fixedly sleeved on the end of the threaded rod 23 close to the stabilizing plate 2. The connecting ring 6 is made of silica gel. By arranging the connecting ring 6, the friction between the staff and the threaded rod 23 is increased, so as to better rotate the threaded rod 23.
[0022] Both the stabilizing plate 2 and the partition plate 21 are distributed in a U-shaped state, making the connection between the stabilizing plate 2 and the second housing 11 more stable. At the same time, the partition plate 21 can also better separate the hand chain.
[0023] Working principle: In actual use, the hand chain pulls the hand chain wheel 13 to rotate, the hand chain wheel 13 drives the five-tooth long shaft 12 to rotate, the five-tooth long shaft 12 drives the first gear 14 to rotate, so that the first gear 14 drives the extension rod 16 to rotate through the second gear 15, the extension rod 16 drives the worm 17 to rotate, the worm 17 drives the worm wheel 18 to rotate, and the worm wheel 18 drives the rotating rod 19 to rotate. When the hand chain wheel 13 stops rotating, the worm 17 loses the power source and stops rotating, and the worm 17 itself can be self-locking, so that the worm 17 can rotate. The second gear 15 brakes, and the second gear 15 brakes the first gear 14 and the five-tooth long shaft 12; by driving the threaded rod 23 at the bottom of the two stabilizing plates 2 to rotate, the connecting plate 22 threadedly sleeved on the outside of the threaded rod 23 is driven to move away from the stabilizing plate 2, and the connecting plate 22 drives the partition plate 21 to move until the partition plates 21 on the two stabilizing plates 2 fit together. At this time, the two ends of the bracelet chain are respectively located between the two partition plates 21, so that the bracelet chain can be separated to avoid the bracelet chain being entangled during use and affecting use.
[0024] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. An overload protection device for a hand chain hoist, comprising a first housing (1) and a second housing (11), characterized in that: A five-tooth long shaft (12) rotatably penetrates through the interiors of the first housing (1) and the second housing (11) together. A bracelet wheel (13) is provided inside the second housing (11). The five-tooth long shaft (12) fixedly penetrates through the bracelet wheel (13). A first gear (14) is fixedly sleeved on the outer side of the five-tooth long shaft (12). A second gear (15) is meshed and connected to the top of the first gear (14). An extension rod (16) is fixedly penetrated through the middle of the second gear (15). The extension rod (16) is rotatably installed on the inner wall of the second housing (11). A worm (17) is fixedly installed at one end of the extension rod (16) close to the bracelet wheel (13). A worm gear (18) is meshed and connected to the top of the worm (17). A rotating rod (19) is fixedly penetrated through the middle of the worm gear (18). Symmetrically distributed support rods (191) are fixedly penetrated through the top of the second housing (11). The two ends of the rotating rod (19) are respectively rotatably installed in the corresponding support rods (191).
2. The overload protection device for a hand chain hoist according to claim 1, characterized in that: Two stabilizing plates (2) are fixedly installed at the bottom end of the second housing (11). The two stabilizing plates (2) are mirror-symmetrically distributed. Symmetrically distributed partition plates (21) are slidably arranged on the lower surface of the inner wall of the stabilizing plate (2). A connecting plate (22) is fixedly installed on the relative sides of the two partition plates (21). A threaded rod (23) rotatably penetrates through the bottom of the stabilizing plate (2). The threaded rod (23) threadedly penetrates through the connecting plate (22).
3. The overload protection device for a hand chain hoist as claimed in claim 2, characterized in that: Symmetrically distributed limiting rods (3) are fixedly installed on the inner wall of the stabilizing plate (2). Both of the two limiting rods (3) penetrate through the connecting plate (22).
4. The overload protection device for a hand chain hoist as claimed in claim 3, characterized in that: Symmetrically distributed stabilizing rods (4) are fixedly installed at the bottom ends of the two partition plates (21). Two groups of symmetrically distributed stabilizing grooves (41) are formed on the lower surface of the inner wall of the stabilizing plate (2). The plurality of stabilizing rods (4) are respectively movably clamped in the corresponding stabilizing grooves (41).
5. The overload protection device for a hand chain hoist as claimed in claim 2, characterized in that: An observation window (5) is fixedly installed at the top of the second housing (11).
6. The overload protection device for a hand chain hoist as claimed in claim 4, characterized in that: A connecting ring (6) is fixedly sleeved at one end of the threaded rod (23) close to the stabilizing plate (2). The connecting ring (6) is made of silica gel material.
7. The overload protection device for a hand chain hoist as claimed in claim 6, characterized in that: Both the stabilizing plate (2) and the partition plate (21) are distributed in a C-shaped state.
8. The overload protection device for a hand chain hoist as claimed in claim 5, characterized in that: The observation window (5) is made of a transparent material.