Hand-operated winch with overload protection function

Abstract

The hand-operated winch with the overload protection function comprises a base and a wheel disc, a rotating shaft is fixedly connected to the axis position in the wheel disc, the rear end of the rotating shaft is rotationally connected with the base, and a square hole gear is fixedly connected to the surface of the rear side of the rotating shaft; the flower hole gear is located on the rear side of the square hole gear, the axis position of the flower hole gear is fixedly connected with a first five-tooth short shaft, the first five-tooth short shaft is meshed with the square hole gear, and the rear end of the first five-tooth short shaft is rotationally connected with the base and used for driving the square hole gear to rotate; the second five-tooth short shaft is meshed with the right side of the flower hole gear, and the rear end of the second five-tooth short shaft is rotationally connected with the base and used for driving the flower hole gear to rotate; the rear end of the brake disc is fixedly connected with a transmission shaft; the ratchet wheel is fixedly connected to the front end of the second five-tooth short shaft, the rear end of the transmission shaft is rotationally connected with the ratchet wheel, a cavity is formed in the ratchet wheel, and a disconnection assembly is arranged in the cavity. The winch has the advantages that all modules in the winch can be rapidly disassembled and assembled, and then the maintenance and overhaul efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of winches, in particular to a hand-cranked winch with an overload protection function. Background Art

[0002] Hand winches, a human-powered mechanical device that lifts and pulls heavy objects by winding or releasing a rope on a drum, are widely used in fields such as outdoor rescue, construction, ship operations, and logistics. In these complex and diverse scenarios, hand winches play an indispensable role, providing the necessary power support for various operations.

[0003] While some hand-cranked winches currently on the market offer some overload protection, these often rely on simple mechanical limitations, such as fixed mechanical limiters to prevent the winch from over-operating. This type of protection suffers from issues like delayed response and low accuracy, and it lacks the flexibility to adjust the protection strategy to subtle changes in the actual load. Furthermore, once the mechanical limiter is triggered, manual reset is often required, severely impacting work efficiency and potentially delaying rescue or construction progress in emergencies. Summary of the Invention

[0004] The present invention provides a hand-cranked winch with an overload protection function, which is used to solve the problems of low safety and untimely response in the prior art.

[0005] Therefore, the present invention provides a hand-cranked winch with an overload protection function, comprising: a base and a wheel disc, wherein the inner axial position of the wheel disc is fixedly connected to a rotating shaft, the rear end of the rotating shaft is rotatably connected to the base, and the rear surface of the rotating shaft is fixedly connected to a square hole gear; a flower hole gear, wherein the flower hole gear is located on the rear side of the square hole gear, and the axial position of the flower hole gear is fixedly connected to a first five-tooth short shaft, the first five-tooth short shaft engages with the square hole gear and the rear end is rotatably connected to the base to drive the square hole gear to rotate; a second five-tooth short shaft, the second five-tooth short shaft engages with the right side of the flower hole gear and the rear end is rotatably connected to the base to drive the flower hole gear to rotate; a brake disc, the rear end of the brake disc is fixedly connected to a transmission shaft; a ratchet, wherein the ratchet is fixedly connected to the front end of the second five-tooth short shaft, and the rear end of the transmission shaft is rotatably connected to the ratchet, a cavity is opened inside the ratchet, and a disconnecting component is provided inside the cavity.

[0006] Furthermore, a gear cover is fixedly connected to the front end surface of the base, and the square hole gear, the flower hole gear, the first five-tooth short shaft and the second five-tooth short shaft are all located inside the gear cover.

[0007] Furthermore, a protective shell is fixedly connected to the front end surface of the gear cover, and the transmission shaft passes through the protective shell.

[0008] Furthermore, a pawl is provided inside the protective shell for use with the ratchet, and the axial position of the pawl is rotatably connected to a fixing rod, and the rear end of the fixing rod is fixedly connected to the gear cover.

[0009] Furthermore, the pawl is located on the left side of the ratchet and is provided with a torsion spring inside to keep the pawl always in contact with the ratchet.

[0010] Furthermore, the outer wall surface of the rear end of the transmission shaft is provided with four sliding grooves distributed at equal intervals in a circle, the bottom end of each sliding groove is fixedly connected to a telescopic column, the four telescopic columns are fixedly connected to a pulley at one end away from each other, and the surfaces of the four telescopic columns are all sleeved with compression springs.

[0011] Furthermore, the disconnect assembly includes: a swivel, the front and rear ends of which are rotatably connected to the ratchet, the outer wall of the swivel is provided with a tooth groove, and the inner wall of the swivel is provided with four special-shaped extrusion blocks distributed at equal intervals around the circumference; a micro motor, the rear end of the micro motor is fixedly connected to the ratchet, the output shaft end of the micro motor is fixedly connected to a transmission gear, and the transmission gear engages with the tooth groove to drive the swivel to rotate.

[0012] Furthermore, the special-shaped extrusion block corresponds to the pulley one by one and contacts with each other to drive the ratchet to rotate.

[0013] Furthermore, slots are provided at positions corresponding to the outer wall of the ratchet and the transmission gear, allowing the transmission gear to pass through.

[0014] Furthermore, a pressure sensor is provided on the surface of the rotating shaft for detecting the load of the wheel disc, and a controller is provided inside the rotating shaft for receiving data collected by the pressure sensor and controlling the disconnect assembly according to the load condition of the wheel disc.

[0015] Compared with the existing technology, the advantages of the present invention are: the hand-cranked winch with overload protection function of the present invention accurately detects the wheel load through the pressure sensor on the surface of the rotating shaft, and the controller intelligently controls the disconnection component according to the collected data, thereby achieving a fast and accurate response in case of overload; the cooperation between the pawl and the ratchet prevents reversal and ensures safe use; compared with the traditional mechanical limit protection method, it not only responds promptly and has high protection accuracy, but also avoids the tedious operation of manual reset, significantly improves work efficiency, effectively extends the service life of the equipment, reduces the risk of safety accidents, and greatly improves the convenience and reliability of use while ensuring the safety of personnel life and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a three-dimensional diagram of a hand-cranked winch provided by an embodiment of the present invention. Figure 1 ; Figure 2 is an exploded view of a hand-cranked winch provided in an embodiment of the present invention; Figure 3 This is a three-dimensional diagram of a hand-cranked winch provided by an embodiment of the present invention. Figure 2 ; Figure 4 is a cross-sectional view of a ratchet provided in an embodiment of the present invention; Figure 5 is a cross-sectional view of a transmission shaft provided by an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a disconnect assembly provided by an embodiment of the present invention; Figure 7 The embodiment of the present invention provides Figure 5 A partial enlarged view of point A in the middle.

[0018] As shown in the figure, the reference numerals of the present invention are as follows: 1. Base; 101. Gear cover; 102. Protective shell; 2. Wheel; 201. Rotating shaft; 202. Square hole gear; 3. Flower hole gear; 301. First five-tooth short shaft; 4. Second five-tooth short shaft; 5. Brake disc; 501. Drive shaft; 502. Slide; 503. Telescopic column; 504. Pulley; 505. Compression spring; 6. Ratchet; 601. Cavity; 602. Notch; 7. Disconnect assembly; 701. Swivel; 702. Tooth groove; 703. Micro motor; 704. Drive gear; 705. Special-shaped extrusion block; 8. Pawl; 801. Fixing rod. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0020] The present invention provides a hand-cranked winch with an overload protection function in the following embodiments: First embodiment: Combine Figure 1-Figure 7 The embodiment of the present invention discloses a hand-cranked winch with an overload protection function, comprising: a base 1, a wheel disc 2, a flower hole gear 3, a second five-tooth short shaft 4, a brake disc 5, a ratchet 6, and a disconnecting assembly 7. The inner axis position of the wheel disc 2 is fixedly connected to a rotating shaft 201, the rear end of the rotating shaft 201 is rotatably connected to the base 1, and the rear surface of the rotating shaft 201 is fixedly connected to a square hole gear 202; the flower hole gear 3 is located behind the square hole gear 202, and the axis position of the flower hole gear 3 is fixedly connected to the first five-tooth short shaft 301. The first five-tooth short shaft 301 engages with the square hole gear 202 and the rear end is rotated to connect to the base 1 to drive the square hole gear 202 to rotate; the second five-tooth short shaft 4 engages with the right side of the flower hole gear 3 and the rear end is rotated to connect to the base 1 to drive the flower hole gear 3 to rotate; the rear end of the brake disc 5 is fixedly connected to the transmission shaft 501; the ratchet 6 is fixedly connected to the front end of the second five-tooth short shaft 4, and the rear end of the transmission shaft 501 is rotated to connect to the ratchet 6. A cavity 601 is opened inside the ratchet 6, and the disconnecting component 7 is located inside the cavity 601.

[0021] The hand-cranked winch provided by the embodiment of the present invention can rotate the brake disc 5, which drives the flower-hole gear 3 via the second five-tooth short shaft 4. The flower-hole gear 3 further drives the rotating shaft 201 via the square-hole gear 202, thereby rotating the wheel disc 2, authorizing the cable to lift the cargo. This transmission method improves transmission efficiency and overall winch stability.

[0022] Furthermore, in order to protect the various parts in the winch, the present invention also has a gear cover 101 fixedly connected to the front end surface of the base 1, and the square hole gear 202, the flower hole gear 3, the first five-tooth short shaft 301 and the second five-tooth short shaft 4 are all located inside the gear cover 101.

[0023] With this design, the square hole gear 202, the flower hole gear 3, the first five-tooth short shaft 301 and the second five-tooth short shaft 4 are isolated from the outside world, reducing wear and preventing users from touching the gears and getting injured.

[0024] Furthermore, in order to prevent the wheel 2 from automatically releasing the cable, the present invention is also provided with a pawl 8, which is rotatably connected to a fixed rod 801 at the axial position of the pawl 8, and the rear end of the fixed rod 801 is fixedly connected to the gear cover 101. The pawl 8 is located on the left side of the ratchet 6 and is provided with a torsion spring inside to keep the pawl 8 always in contact with the ratchet 6. At the same time, a protective shell 102 is provided at the front end of the gear cover 101 to protect the ratchet 6 and the pawl 8.

[0025] With this design, when the user releases the brake disc 5, the gravity of the cargo pulls the drawstring downward, causing the wheel disc 2 to rotate counterclockwise. At this time, the pawl 8 contacts the ratchet wheel 6, preventing it from rotating, thereby fixing the wheel disc 2 and preventing the cargo from falling automatically.

[0026] Furthermore, four chute grooves 502 are distributed at equal intervals in a circle on the outer wall surface at the rear end of the transmission shaft 501. A telescopic column 503 is fixedly connected to the bottom end of each chute 502. The four telescopic columns 503 are fixedly connected to a pulley 504 at one end away from each other. The diameter of the pulley 504 is slightly smaller than the diameter of the chute 502, so it can move inside the chute 502. Compression springs 505 are sleeved on the surface of the four telescopic columns 503.

[0027] Through this design, the compression spring 505 can use its elastic force to push the pulley 504 into the disconnect assembly 7. When the brake disc 5 is rotated, the pulley 504 will contact the components inside the disconnect assembly 7, thereby driving the entire ratchet 6 to rotate and realize transmission.

[0028] Furthermore, the disconnect assembly 7 includes: a swivel 701 and a micro motor 703, the micro motor 703 is powered by a built-in battery, the front and rear ends of the swivel 701 are rotatably connected to the ratchet 6, the outer wall of the swivel 701 is provided with a tooth groove 702, and the inner wall of the swivel 701 is provided with four special-shaped extrusion blocks 705 distributed at equal intervals around the circumference, which are used to squeeze the pulley 504; the rear end of the micro motor 703 is fixedly connected to the ratchet 6, and the output shaft end of the micro motor 703 is fixedly connected to the transmission gear 704, which engages the tooth groove 702 to drive the swivel 701 to rotate, and the micro motor 703 can drive the entire swivel 701 to rotate through the transmission gear 704.

[0029] The embodiment of the present invention utilizes the design of the disconnect assembly 7 to achieve rapid disconnection between the drive shaft 501 and the ratchet 6. The steps are as follows: the micromotor 703 controls the rotation of the drive gear 704, which drives the swivel 701 clockwise via the tooth groove 702. Simultaneously, the shaped extrusion block 705 squeezes the pulley 504, causing it to retract into the slot 502, completing the disconnection. At this point, if the brake disc 5 continues to rotate, the drive shaft 501 will only rotate within the ratchet 6, without driving the ratchet 6 to rotate.

[0030] Furthermore, in order to facilitate the rotation of the transmission gear 704, the present invention further provides a notch 602 at a position corresponding to the outer wall of the ratchet 6 and the transmission gear 704, so that the transmission gear 704 can pass through.

[0031] Furthermore, in order to ensure the accuracy and timeliness of the overload protection function, the present invention also provides a pressure sensor on the surface of the rotating shaft 201 to detect the load of the wheel disc 2, and a controller is provided inside the rotating shaft 201 to receive data collected by the pressure sensor and control the disconnect component 7 according to the load condition of the wheel disc 2.

[0032] Through the above technical solution, the pressure sensor can monitor the pressure load on the wheel disc 2 in real time and transmit it to the controller. When the pressure load exceeds a preset threshold, the controller will issue a control signal to activate the micro motor 703, disconnecting the transmission shaft 501 from the ratchet 6. This structural design greatly improves the accuracy and timeliness of overload protection, protects the safety of users, and extends the service life of the entire winch.

[0033] The beneficial effects of the hand-cranked winch with overload protection function provided by the embodiment of the present invention are: a pressure sensor is innovatively set on the surface of the rotating shaft 201, which can detect the load changes of the wheel disc 2 in real time and accurately. In conjunction with the controller inside the rotating shaft 201, the collected data can be quickly analyzed and processed, and the disconnection component 7 can be intelligently controlled according to the load conditions. Compared with the fixed mechanical limit protection of the traditional winch, its response speed is greatly improved, and it can react in time at the moment of overload, and the protection accuracy has achieved a qualitative leap. The uniquely designed discontinuous connection structure of the transmission shaft 501 and the ratchet 6, through the cooperation of the special-shaped extrusion block 705 on the inner wall of the rotating ring 701 and the pulley 504, realizes the rapid cutting off of power transmission when overloaded, effectively avoids structural damage to the winch due to continuous overload, and significantly extends the service life of the equipment. In addition, the cooperation mechanism of the pawl 8 and the ratchet 6 not only prevents the winch from reversing, but also further ensures safety during use. Furthermore, the present invention eliminates the need for tedious manual resetting operations, significantly improving work efficiency. This advantage is particularly prominent in time-sensitive scenarios such as construction, ship repair, and field rescue. Furthermore, the design effectively reduces the risk of accidents, comprehensively safeguarding the safety of life and property, and significantly improving the convenience, reliability, and safety of hand-cranked winches.

[0034] Second embodiment: During use, the hand-cranked winch provided by the present invention monitors the load borne by the transmission shaft 501 in real time through a pressure sensor and transmits the load to a controller. When the pressure load exceeds a preset threshold, the controller sends a control signal to start the micro-motor 703. At this time, the micro-motor 703 controls the rotation of the transmission gear 704, which drives the swivel 701 clockwise through the tooth groove 702. At the same time, the special-shaped extrusion block 705 squeezes the pulley 504, causing the pulley 504 to retract into the chute 502. At this time, the brake disc 5 continues to rotate, and the transmission shaft 501 only rotates inside the ratchet 6 without driving the ratchet 6 to rotate, thus realizing the overload protection function. When the pressure sensor detects that the load borne by the transmission shaft 501 is less than the threshold, the controller sends a control signal again, reversely starting the micro-motor 703, and then causing the swivel 701 to rotate counterclockwise. At this time, the pulley 504 pops out of the transmission shaft 501 again, and the connection with the ratchet 6 can be restored.

[0035] Therefore, in summary, the hand-cranked winch with overload protection function described in the present invention can greatly improve the safety of winch use and the speed of overload protection response.

[0036] It should be noted that the electrical components appearing in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that controls a computer, etc. The specific implementation method of this disclosure omits the detailed description of known functions and known components. To ensure the compatibility of the equipment, the operating methods used are consistent with the parameters of marketed equipment.

[0037] In short, the above description is only a preferred embodiment of the technical solution of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A hand-crank winch with overload protection function, characterized in that: include: A base (1) and a wheel disc (2), wherein a rotating shaft (201) is fixedly connected to an internal axis position of the wheel disc (2), a rear end of the rotating shaft (201) is rotatably connected to the base (1), and a square hole gear (202) is fixedly connected to a rear surface of the rotating shaft (201); A flower hole gear (3), the flower hole gear (3) is located at the rear side of the square hole gear (202), a first five-tooth short shaft (301) is fixedly connected to the axis of the flower hole gear (3), the first five-tooth short shaft (301) is engaged with the square hole gear (202) and the rear end is rotatably connected to the base (1) to drive the square hole gear (202) to rotate; a second five-tooth short shaft (4), the second five-tooth short shaft (4) being engaged with the right side of the flower hole gear (3) and having a rear end rotatably connected to the base (1) to drive the flower hole gear (3) to rotate; a brake disc (5), wherein a transmission shaft (501) is fixedly connected to the rear end of the brake disc (5); A ratchet (6), the ratchet (6) being fixedly connected to the front end of the second five-tooth short shaft (4), the rear end of the transmission shaft (501) being rotatably connected to the ratchet (6), the ratchet (6) being provided with a cavity (601) therein, and a disconnecting assembly (7) being provided therein; The disconnect assembly (7) can control the connection between the transmission shaft (501) and the ratchet (6), thereby achieving overload protection.

2. The hand-crank winch according to claim 1, characterized in that: The front end surface of the base (1) is fixedly connected to a gear cover (101), and the square hole gear (202), the flower hole gear (3), the first five-tooth short shaft (301) and the second five-tooth short shaft (4) are all located inside the gear cover (101).

3. The hand-crank winch according to claim 2, characterized in that: The front end surface of the gear cover (101) is fixedly connected to a protective shell (102), and the transmission shaft (501) passes through the protective shell (102).

4. The hand-crank winch according to claim 3, characterized in that: A pawl (8) used in conjunction with the ratchet (6) is provided inside the protective shell (102); the pawl (8) is rotatably connected to a fixing rod (801) at an axial position; the fixing rod (801) is fixedly connected to the gear cover shell (101) at a rear end.

5. The hand-crank winch according to claim 4, characterized in that: The pawl (8) is located on the left side of the ratchet (6) and is internally provided with a torsion spring for keeping the pawl (8) always in contact with the ratchet (6).

6. The hand-crank winch according to claim 1, characterized in that: The outer wall surface of the rear end of the transmission shaft (501) is provided with four chute grooves (502) distributed at equal intervals in a circle, and the bottom end of each chute (502) is fixedly connected to a telescopic column (503), and the four telescopic columns (503) are fixedly connected to a pulley (504) at one end away from each other, and the surfaces of the four telescopic columns (503) are all sleeved with compression springs (505).

7. The hand-crank winch according to claim 6, characterized in that: The disconnect assembly (7) comprises: A rotating ring (701), wherein both front and rear ends of the rotating ring (701) are rotatably connected to the ratchet (6), a tooth groove (702) is provided on the outer wall of the rotating ring (701), and four special-shaped extrusion blocks (705) are distributed at equal intervals around the circumference on the inner wall of the rotating ring (701); A micro motor (703) is provided, wherein the rear end of the micro motor (703) is fixedly connected to the ratchet (6), the output shaft end of the micro motor (703) is fixedly connected to a transmission gear (704), and the transmission gear (704) engages with the tooth groove (702) to drive the rotating ring (701) to rotate.

8. The hand-crank winch according to claim 7, characterized in that: The special-shaped extrusion block (705) corresponds to the pulley (504) one by one and contacts each other, and is used to drive the ratchet (6) to rotate.

9. The hand-crank winch according to claim 7, characterized in that: A notch (602) is provided at a position corresponding to the outer wall of the ratchet (6) and the transmission gear (704), allowing the transmission gear (704) to pass through.

10. The hand-crank winch according to claim 1, characterized in that: A pressure sensor is provided on the surface of the rotating shaft (201) for detecting the load of the wheel disc (2). A controller is provided inside the rotating shaft (201) for receiving data collected by the pressure sensor and controlling the disconnecting assembly (7) according to the load condition of the wheel disc (2).

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