An electric hoist with double brakes and hand-cranking function

Abstract

The present invention relates to an electric hoist with double brakes and a hand-cranking function, comprising a motor, an electric hoist reducer, a drum and a hook, wherein the hook is used for hoisting goods. The electric hoist reducer comprises a housing, a primary driving gear, a housing cover, a bearing, an oil seal, a centrifugal brake assembly, a plug cover, a flat key, a brake disc and an O-ring. The centrifugal brake assembly is connected to the primary driving gear. When the rotation speed of the primary driving gear reaches a set threshold, the centrifugal brake assembly and the brake disc are in contact with each other to achieve slow braking, thereby preventing the electromagnetic brake from failing and causing the goods to stall and fall. The housing cover is provided with a bearing hole, an oil seal hole, a sealing groove and a brake disc connection stopper to ensure the gear transmission accuracy, braking effect and sealing, and to extend the service life of the reducer. The present invention improves the safety, reliability and applicability of the electric hoist, and is suitable for lifting operations in a variety of scenarios.

Description

Technical Field

[0001] The invention relates to the technical field of electric hoists, and in particular to an electric hoist with double brakes and a hand-cranking function. Background Art

[0002] With the acceleration of urbanization and the rapid development of the electric hoist industry, customers have higher and higher safety requirements for electric hoists, and safety is particularly important. In the existing technology, electric hoists are usually equipped with only one electromagnetic brake, which can only operate when there is power and other components are not faulty.

[0003] During the use of electric hoists, as the electrical components of the electric control age and program failures occur, the electric hoist may suddenly stop running during operation; Not every electric hoist is put on the test bench for load-bearing test. Some electromagnetic brakes are not adjusted properly during installation, resulting in failure to brake. Subsequent electromagnetic brake failures can cause the goods to fall quickly due to failure to brake. Electric hoists may also encounter sudden power outages during use; These situations may result in the cargo being unable to land or even delayed delivery, or in serious cases causing the cargo to fall rapidly and endanger the lives of on-site workers. Summary of the invention

[0004] The purpose of the present invention is to provide an electric hoist with double brakes and a hand-cranking function to improve the safety, reliability and applicability of the electric hoist, which is suitable for lifting operations in various scenarios.

[0005] The present invention is implemented by adopting the following technical scheme: an electric hoist with double brakes and hand-cranking function, characterized in that it includes a motor, an electric hoist reducer, a drum and a hook, characterized in that the electric hoist reducer includes a primary driving gear, a centrifugal brake assembly, and a brake disc, and the centrifugal brake assembly is connected to the primary driving gear and is used for achieving braking and deceleration by friction with the statically connected brake disc when the rotation speed of the primary driving gear reaches a set threshold.

[0006] Furthermore, the motor is provided with an electromagnetic brake and a manual release handle, and the electromagnetic brake can be closed or reactivated by pulling the manual release handle to ensure safe braking when the electromagnetic brake fails.

[0007] Furthermore, the electric hoist reducer also includes a box cover and a bearing. The box cover is provided with a bearing hole, and the bearing is installed in the bearing hole to support the primary driving gear to avoid eccentricity caused by the cantilever due to the installation of the centrifugal brake assembly.

[0008] Furthermore, the box cover is provided with an oil seal hole, and the oil seal is installed in the oil seal hole to prevent the oil in the reducer from leaking into the centrifugal brake assembly, or to prevent the iron slag generated by the braking of the centrifugal brake assembly from entering the reducer.

[0009] Furthermore, a sealing groove is provided on the box cover, and an O-ring is installed in the sealing groove to prevent air and water from entering the centrifugal brake assembly to ensure the braking effect.

[0010] Furthermore, the brake disc is provided with a manual crank hole, which is closed by a plug cover when not in use. When the manual crank function is used, the plug cover is removed and the manual crank function is achieved by inserting a corresponding hexagonal tool or electric tool.

[0011] Furthermore, the centrifugal brake assembly is installed in a brake disc, and the brake disc serves as a motor connection flange, and the motor and the electric hoist reducer are connected through the brake disc to reduce space occupancy.

[0012] The electric hoist with double brakes and hand-cranking function described in the present invention has the following beneficial effects: By adding a centrifugal brake assembly to the electric hoist, safe and slow braking is achieved when the electromagnetic brake fails, preventing the cargo from stalling and falling, and improving the safety of use; by adding bearings, oil seals and sealing grooves to the reducer cover, the gear transmission accuracy and braking accuracy are guaranteed, while preventing oil leakage and external impurities from invading, thereby increasing the working life of the reducer; the design of the hand-crank function ensures that the cargo can still be lifted or lowered by manual operation in the absence of power or in an emergency, improving the applicability and reliability of the equipment; in addition, the design of integrating the centrifugal brake assembly into the motor flange further optimizes the structural layout, effectively saves space, and is suitable for miniaturized and highly integrated electric hoist application scenarios. . BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention 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. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of a first embodiment of an electric hoist reducer of the present invention; Figure 3 This is a structural diagram of the second embodiment of the electric hoist reducer of the present invention. In the figure, 100-motor; 101-release handle; 200-electric hoist reducer; 300-reel; 400-hook; 500-cargo; 201-box; 202-first-stage driving gear; 203-box cover; 204-bearing; 205-oil seal; 206-centrifugal brake assembly; 207-blocking cover; 208-flat key; 209-brake disc; 210-O-ring; 102-connecting flange. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1-3 As shown, an electric hoist with double brakes and hand-cranking function includes a motor 100, an electric hoist reducer 200, a drum 300 and a hook 400, and a cargo 500 is hung on the hook 400. The electric hoist reducer 200 includes a box body 201, a primary driving gear 202, a box cover 203, a bearing 204, an oil seal 205, a centrifugal brake assembly 206, a plug cover 207, a flat key 208, a brake disc 209 and an O-ring 210.

[0018] In the first embodiment, the motor brake of the electric hoist is provided with a manual release handle 101, and the brake can be turned off by pulling the release handle 101 to disable the electromagnetic brake, and the brake can be turned on by pulling the release handle 101 back to enable the electromagnetic brake to be effective again; The box cover 203 of the reducer is provided with a bearing hole (the industry's first-level driving gear 202 adopts a short cantilever). By adding a bearing 204 to the box cover 203, it is ensured that the gear transmission position on the first-level driving gear 202 and the braking position of the centrifugal brake assembly 206 will not be cantilevered due to the addition of the centrifugal brake assembly 206, thereby preventing eccentricity. Therefore, adding another bearing 204 to the box cover 203 can ensure the transmission accuracy of the gear and the braking accuracy of the centrifugal brake assembly 206. The reducer cover 203 is provided with an oil seal hole, and the oil seal 205 can prevent the oil in the reducer from leaking into the centrifugal brake assembly 206 to affect the braking effect, and can also prevent the iron slag after braking by the centrifugal brake assembly 206 from entering the reducer to affect the transmission effect and life of the reducer; A sealing groove is provided on the box cover 203 of the reducer. The sealing groove is on the stopper that matches the brake disc 209. The sealing groove is equipped with an O-ring 210 to prevent air and water from entering the centrifugal brake assembly 206 and affecting the braking effect of the centrifugal brake assembly 206. The reducer case cover 203 is provided with a brake disc connection stopper, which can ensure the accuracy of the brake disc 209 and ensure that there will be no eccentricity after the brake is connected; The reducer cover 203 is provided with a threaded hole connected to the brake disc 209, which can ensure that the brake disc 209 can be firmly connected to the cover 203 by screws; The primary driving gear 202 is provided with a connection interface with the centrifugal brake assembly 206 (as shown in the figure, it is connected by a flat key 208, but it can also be a spline or interference connection, etc.); The centrifugal brake assembly 206 has various braking speed specifications. The centrifugal brake assembly 206 is connected to the first-stage driving gear 202 and rotates with the first-stage driving gear 202. When the rotation speed of the first-stage driving gear 202 reaches a set threshold, it can be in contact with the statically connected brake disc 209 for friction braking to achieve braking and deceleration; when the rotation speed of the first-stage driving gear 202 does not reach the set threshold, the centrifugal brake assembly 206 will not be in contact with the brake disc 209 for friction braking; the use of the centrifugal brake assembly 206 for slow braking here can avoid the cargo 500 from stalling after the electromagnetic brake fails, resulting in damage to the cargo 500 and threatening the life safety of the staff. Compared with instant braking, slow braking can better protect components such as gears and wire ropes from being damaged by instant impact to extend the service life of the electric hoist; A hand-cranked connecting device is provided at the tail of the first-stage driving gear 202 (not shown in detail in the figure, but not limited to the inner hexagonal hole, and other connecting structures may also be used); A hand-crank hole is provided on the brake disc 209, which is sealed with a plugging cover 207 when not in use. When the hand-crank function is in use, the plugging cover 207 is taken out to expose the hand-crank connection hole. At this time, the hand-crank function can be realized by inserting a corresponding hexagon socket or a corresponding electric screwdriver. When not in use, the hand-crank hole is sealed with the plugging cover 207 to prevent air and water from entering the brake and affecting the braking effect.

[0019] In addition, the position of the centrifugal brake assembly 206 in the above scheme is not limited to being installed at the rear end of the box cover 203. In the second embodiment, the connecting flange 102 of the motor 100 is replaced with a brake disc material to directly make a brake disc (so that the connecting flange 102 plays the role of a brake disc), and a centrifugal brake connecting interface is provided on the motor shaft (not marked in detail in the figure), and the centrifugal brake assembly 206 is directly installed in the motor flange 102 (now used as a brake disc), which can save more space.

[0020] When the electric hoist's electronic control device fails (not limited to electronic control device failures, it can also be power outages or electromagnetic brake failures, etc.), causing the running electric hoist to stop working, the cargo 500 stops in mid-air. At this time, if the cargo needs to be shipped urgently and the fault cannot be found in time, we can first clear the other cargo under the cargo 500 and then go up through the elevator.

[0021] At this time, the cargo can be lowered by hand cranking. The specific operation steps are as follows: open the plug cover 207 installed on the brake disc 209 to expose the hexagonal hole at the tail of the primary driving gear 202, insert the hexagonal socket or the corresponding electric screwdriver corresponding to the hexagonal hole into it (if the connection tool is not limited to the hexagonal socket and the electric screwdriver, it can also be other connection tools or tooling corresponding to the card slot, etc. If the input torque here is too large, a connection tool with a long lever arm can be used), pull the electromagnetic brake release handle 101 to make the electromagnetic brake brake invalid, and the torque is transmitted to the primary driving gear through the hexagonal socket or the electric screwdriver. By turning the hexagonal socket or starting the electric screwdriver, the torque is amplified by the reducer 200 and transmitted to the reel 300. The reel rotates slowly under the action of the torque, and the wire rope and the hook 400 begin to slowly descend, and the cargo 500 slowly descends with the hook until it lands safely. Then pull the electromagnetic brake release handle 101 back to its original position to restore the braking function, take out the hexagonal socket or the electric screwdriver, and seal the brake disc again with the plug cover 207.

[0022] At this time, the brake can also be used to directly lower the cargo 500. The specific operating steps are as follows: while ensuring the safety below, pull the electromagnetic brake release handle 101 to disable the electromagnetic brake. At this time, there is no pulling force to support the cargo. The cargo pulls the hook 400 down under the action of gravity, and the hook pulls the wire rope down to drive the drum 300 to rotate. The drum transmits the torque back to the reducer 200. After the reducer is acted upon by the torque, the gears begin to rotate and are transmitted step by step to the first-level driving gear 202. Under the action of weight acceleration, the cargo descends faster and faster. At this time, the speed of the first-level driving gear also reaches the set threshold, and the centrifugal brake 206 begins to rub against the statically connected brake disc 209, and braking and deceleration are achieved under the action of friction. The cargo begins to slowly descend until it lands safely, and then the electromagnetic brake release handle 101 is pulled back to its original position to restore the braking function.

[0023] The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall be within the scope of protection of the appended claims of the present invention without departing from the spirit and scope of the present invention.

Claims

1. An electric hoist with double brakes and hand-crank function, characterized in that: The invention comprises a motor (100), an electric hoist reducer (200), a reel (300) and a hook (400), and is characterized in that the electric hoist reducer (200) comprises a primary driving gear (202), a centrifugal brake assembly (206) and a brake disc (209), wherein the centrifugal brake assembly (206) is connected to the primary driving gear (202) and is used for achieving braking and deceleration by friction with the statically connected brake disc (209) when the rotation speed of the primary driving gear (202) reaches a set threshold.

2. The electric hoist with double brake and hand-crank function according to claim 1, characterized in that: The motor (100) is provided with an electromagnetic brake and a manual release handle (101); the electromagnetic brake can be closed or reactivated by pulling the manual release handle (101), so as to ensure safe braking when the electromagnetic brake fails.

3. The electric hoist with double brake and hand-crank function according to claim 1, characterized in that: The electric hoist reducer (200) further comprises a box cover (203) and a bearing (204); the box cover (203) is provided with a bearing hole, and the bearing (204) is installed in the bearing hole to support the primary driving gear (202) to avoid eccentricity caused by cantilevering due to the installation of the centrifugal brake assembly (206).

4. The electric hoist with double brake and hand-crank function according to claim 3 is characterized in that: The box cover (203) is provided with an oil seal hole, and the oil seal (205) is installed in the oil seal hole to prevent the oil in the reducer from leaking into the centrifugal brake assembly (206), or to prevent iron slag generated by braking of the centrifugal brake assembly (206) from entering the reducer.

5. The electric hoist with double brake and hand-crank function according to claim 3 is characterized in that: The box cover (203) is provided with a sealing groove, in which an O-ring (210) is installed to prevent air and water from entering the centrifugal brake assembly (206) to ensure a braking effect.

6. The electric hoist with double brake and hand-crank function according to claim 1, characterized in that: The brake disc (209) is provided with a hand-cranking hole, which is closed by a plugging cover (207) when not in use. When the hand-cranking function is used, the plugging cover (207) is removed, and the hand-cranking function is realized by inserting a corresponding hexagonal tool or an electric tool.

7. The electric hoist with double brake and hand-crank function according to claim 1, characterized in that: The centrifugal brake assembly (206) is installed in a brake disc (209), and the brake disc (209) serves as a motor connection flange. The motor (100) and the electric hoist reducer (200) are connected via the brake disc (209) to reduce space occupation.

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