Large-load hoist crane speed reducer

Abstract

The utility model relates to the technical field of hoisting equipment, in particular to a large-load hoist crane speed reducer which comprises a shell. The cooling fins are evenly distributed and installed on the side wall of the upper portion of the shell, the arc-shaped cooling pipes are transversely arranged between the evenly-distributed cooling fins, the two centrifugal braking assemblies are located between the two check blocks around the rotating track of the output shaft, cooling liquid in the arc-shaped cooling pipes can cool the cooling fins, and therefore the cooling effect of the centrifugal braking assemblies is improved. According to the centrifugal braking device, the output shaft is arranged in the shell and cools lubricating oil in the shell, cooling liquid circulated out of the arc-shaped cooling pipe can also be cooled through the circulating cooling assembly, and when the output shaft is aged and fractured during use, the output shaft can rapidly rotate under the effect of the weight of goods, and the output shaft is prevented from rotating through blocking cooperation of two centrifugal braking assemblies and two check blocks; the cooling effect of the speed reducer is achieved through cooperation, normal use of the speed reducer is prevented from being affected by heat accumulation, goods can be prevented from falling off after the speed reducer is damaged, and use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a large-load lifting hoist reducer. Background Art

[0002] A hoist is a lifting device, commonly used for the horizontal movement of heavy goods. It is usually used in the production workshops of medium and large equipment or other heavy items. The reducer is an important component of the hoist. The reducer can convert the high speed of the motor into low speed and high torque, thereby lifting the goods.

[0003] A patent with announcement number CN 104649168 A discloses an electric hoist reducer, including a box body, a box cover is packaged on the outer wall of the left end of the box body, and the input shaft and the output shaft are connected to the outer wall of the right end of the box body. The input shaft passes through the outer wall of the right end of the box body and is supported on the inner wall of the box cover via bearings. The two ends of the output shaft are respectively supported on the outer walls of the two ends of the box body via bearings. A skeleton sealing ring and / or a blind cover that packages the bearings are provided between the right end of the input shaft and the right end of the output shaft, and between the output shaft and the outer wall of the right end of the box body; the input shaft gear is transmitted to a gear reduction transmission mechanism arranged in the box cover, and the gear reduction transmission mechanism is transmission-connected to the output gear fixedly sleeved on the output shaft, and the output shaft extending from the outer wall of the right end of the box body is provided with an output thread or an output keyway on the outer circumference, which can meet the use of a large reduction ratio and a large torque hoist.

[0004] However, due to the long-term use of the reducer, heat will be generated inside the reducer. The existing reducer cannot cool the inside. The heat accumulation will affect the normal use of the reducer, resulting in poor heat dissipation effect. In addition, due to the long-term use of the reducer output shaft, its bearing capacity will be reduced. During lifting use, its output shaft is prone to breakage. Once the output shaft breaks, it will cause the hoisted goods to fall and be damaged or cause injury to the operator, resulting in poor protection effect and low safety of use. Therefore, a large-load hoist reducer is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and to address the problems existing in the prior art, the utility model proposes a heavy-load hoist reducer.

[0006] The technical solution adopted by the utility model to solve the technical problem is as follows: a large-load hoisting hoist reducer described in the utility model comprises a shell; heat dissipation fins are evenly distributed and installed on the upper side wall of the shell, and the heat dissipation fins are arranged through the shell, arc-shaped cooling pipes are arranged horizontally between the evenly distributed heat dissipation fins, and the arc-shaped cooling pipes are located in the shell, an output shaft is rotatably arranged in the shell, and a circulating cooling component is arranged at one end of the shell opposite to the output shaft;

[0007] A top cover is arranged in the opening of one end of the shell opposite to the cooling assembly, a sheath is installed on the side of the top cover opposite to the shell, a stopper is symmetrically installed in the sheath, two sets of centrifugal brake assemblies are mirror-imaged on the end of the output shaft opposite to the top cover and the shell, and the two sets of centrifugal brake assemblies are located in the sheath;

[0008] The rotation trajectory of the two sets of centrifugal brake components around the output shaft is located between the two blocks, which cooperates to achieve the effect of cooling the reducer, avoiding heat accumulation affecting the normal use of the reducer, and preventing goods from falling after the reducer is damaged, thereby improving safety of use.

[0009] Preferably, the circulating cooling component includes a cooling box, and the cooling box is installed on the end face of the outer shell opposite to the output shaft, and a cooling elbow is arranged in a Z-shape in the cooling box, and a liquid inlet pipe and a liquid outlet pipe are respectively installed on both sides of the cooling box, and the openings at both ends of the cooling box are respectively communicated with the liquid inlet pipe and the liquid outlet pipe, and the two ends of the arc cooling pipe arranged laterally in the outer shell respectively penetrate the outer shell and are communicated with the liquid inlet pipe and the liquid outlet pipe, and a circulating pump is installed on the liquid inlet pipe, which cooperates to achieve the effect of circulating cooling and improve the cooling and heat dissipation effect.

[0010] Preferably, a No. 2 filling port for injecting lubricating oil is arranged on the end face of the same side as the cooling box, and a No. 1 filling port for injecting coolant is arranged on the cooling box. Sealing plugs are arranged in the opening ends of the No. 1 filling port and the No. 2 filling port, and the arc-shaped cooling pipe, liquid inlet pipe, liquid outlet pipe and cooling elbow are all injected with coolant, which cooperates to ensure the normal use of the reducer and avoid heat accumulation.

[0011] Preferably, the centrifugal brake assembly includes a fixed block, and the fixed block is installed on the output shaft. A fitting groove is provided on the side of the fixed block opposite to the output shaft, and a fitting block is slidably arranged in the fitting groove. A cavity is provided in the fitting block, and two holes are symmetrically provided on the side wall of the cavity close to the output shaft. Two limit rods are respectively penetrated in the two holes, and the top ends of the two limit rods are respectively installed on the top of the cavity, and the lower ends of the two cavities are respectively installed on the bottom of the fitting groove. Springs are respectively sleeved on the two limit rods, and the springs are located in the cavity. The cooperation achieves the effect of improving the safety of use and effectively ensures the safety of the operator.

[0012] Preferably, the two limit rods are parallel to each other, and the limit rod and the output shaft are perpendicular to each other, so that the engaging block can slide on the limit rod and can be accurately thrown out of the engaging groove.

[0013] Preferably, a through hole is penetrated through the side of the top cover, and the output shaft is penetrated through the through hole of the top cover, the center line of the sleeve coincides with the center line of the output shaft, a gear reduction module for transmission is provided in the outer shell, and the gear reduction module is meshed with the output shaft, so as to ensure the normal use of the reducer.

[0014] Preferably, the heat dissipation fins are parallel to the center line of the shell, the arc cooling tube is arranged horizontally in a semicircular shape around the center line of the shell, and a sealed bearing is arranged between the output shaft and the through hole set in the top cover, which cooperates to ensure the heat dissipation effect.

[0015] The utility model is beneficial in that:

[0016] 1. The utility model increases the heat dissipation area by evenly distributing the heat dissipation fins on the upper part of the shell. The coolant in the arc cooling tube will cool the heat dissipation fins and the lubricating oil in the shell. The coolant circulated out of the arc cooling tube will also be cooled by the circulating cooling component, and then the circulating cooling is used. When the output shaft is aged and broken, the output shaft will rotate rapidly under the weight of the cargo, and the two sets of centrifugal brake components and the two blocks will cooperate to prevent the output shaft from rotating. The cooperation achieves the effect of cooling the reducer, avoids heat accumulation affecting the normal use of the reducer, and can prevent cargo from falling after the reducer is damaged, thereby improving safety in use.

[0017] 2. In the utility model, the engaging block will be thrown out of the engaging groove under the action of centrifugal force. When the centrifugal force of the output shaft rotating rapidly to swing the engaging block is greater than the pushing force of the spring, the engaging block will be thrown out of the engaging groove. When the two engaging blocks are blocked by the two stoppers, the output shaft cannot rotate. The cooperation achieves the effect of improving the safety of use and effectively ensures the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 labor.

[0019] Figure 1 is a schematic diagram of a first three-dimensional structure;

[0020] Figure 2 This is an enlarged schematic diagram of the main structure of the reducer;

[0021] Figure 3 It is an enlarged schematic diagram of the main structure of the heat dissipation component;

[0022] Figure 4 It is a cutaway and enlarged schematic diagram of the main structure of the circulating cooling component;

[0023] Figure 5 It is an enlarged schematic diagram of the cutaway main structure of the centrifugal brake assembly.

[0024] In the figure: 1. shell; 2. heat dissipation fins; 3. arc cooling pipe; 4. liquid inlet pipe; 5. liquid outlet pipe; 6. cooling elbow; 7. cooling box; 8. filling port No. 1; 9. filling port No. 2; 10. circulation pump; 11. output shaft; 12. gear reduction module; 13. top cover; 14. sheath; 15. stopper; 16. fixing block; 17. fitting groove; 18. fitting block; 19. cavity; 20. limit rod; 21. spring. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-5 As shown, a large-load hoist reducer comprises a housing 1; heat dissipation fins 2 are evenly distributed and installed on the upper side wall of the housing 1, and the heat dissipation fins 2 are arranged throughout the housing 1, arc-shaped cooling pipes 3 are arranged horizontally between the evenly distributed heat dissipation fins 2, and the arc-shaped cooling pipes 3 are located in the housing 1, an output shaft 11 is rotatably arranged in the housing 1, and a circulating cooling component is arranged at one end of the housing 1 opposite to the output shaft 11;

[0027] A top cover 13 is arranged in the opening of the end of the housing 1 opposite to the cooling assembly, a sheath 14 is installed on the side of the top cover 13 opposite to the housing 1, a stopper 15 is symmetrically installed in the sheath 14, and two sets of centrifugal brake assemblies are mirror-imaged on the end of the output shaft 11 opposite to the top cover 13 and the housing 1, and the two sets of centrifugal brake assemblies are located in the sheath 14;

[0028] The rotation tracks of the two sets of centrifugal brake components around the output shaft 11 are located between the two stoppers 15 .

[0029] During operation, the reducer will generate heat inside due to long-term use. The existing reducer cannot cool the inside. The heat accumulation will affect the normal use of the reducer, resulting in poor heat dissipation effect. In addition, the load-bearing capacity of the output shaft of the reducer will be reduced due to long-term use. The output shaft is easy to break during lifting use. After the output shaft breaks, the hoisted goods will fall and be damaged or cause injury to the operator, resulting in poor protection effect and low safety of use. In this solution, by pouring lubricating oil into the outer shell 1, the reducer will cooperate with the output shaft 11 through the gear reduction module 12 when it is running, and the heat dissipated will be absorbed by the lubricating oil therein, and the lubricating oil will flow in the outer shell 1 under the operation of the gear reduction module 12 and the output shaft 11. When the lubricating oil in the outer shell 1 flows, the heat will be transferred to the outer shell 1 and dissipated from the outer shell 1. The heat dissipation area is increased by the heat dissipation fins 2 evenly distributed on the upper part of the outer shell 1, thereby improving the heat dissipation speed. In addition, the arc cooling pipes 3 are arranged horizontally on one side of the heat dissipation fins 2 located in the outer shell 1. The coolant in the cooling tube 3 will cool the heat dissipation fins 2 and the lubricating oil in the casing 1, and the circulating cooling component will circulate the external coolant into the arc cooling tube 3, thereby improving the cooling effect, and the coolant circulated out of the arc cooling tube 3 will also be cooled by the circulating cooling component, and then be used for circulating cooling. During normal use, the output shaft 11 will rotate slowly, and when the output shaft 11 is aged and broken, the output shaft 11 will rotate rapidly under the weight of the cargo, and when the output shaft 11 rotates rapidly, the two sets of centrifugal brake assemblies mirror-set thereon will be unfolded, and after the two sets of centrifugal brake assemblies are unfolded, the rotation trajectory around the output shaft 11 will intersect with the two blocks 15 installed in the sheath 14, and be blocked by the two blocks 15, and then the two sets of centrifugal brake assemblies and the two blocks 15 are blocked to prevent the output shaft 11 from rotating, and the cargo is prevented from falling. The coordination achieves the effect of cooling the reducer, avoids heat accumulation affecting the normal use of the reducer, and can avoid cargo falling after the reducer is damaged, thereby improving the safety of use.

[0030] See also Figure 1-4 As shown, the circulating cooling component includes a cooling box 7, and the cooling box 7 is installed on the end face of the outer shell 1 opposite to the output shaft 11, and a cooling elbow 6 is arranged in a Z-shape in the cooling box 7, and a liquid inlet pipe 4 and a liquid outlet pipe 5 are respectively installed on both sides of the cooling box 7, and the openings at both ends of the cooling box 7 are respectively communicated with the liquid inlet pipe 4 and the liquid outlet pipe 5, and the two ends of the arc cooling pipe 3 arranged transversely in the outer shell 1 respectively penetrate the outer shell 1 and communicate with the liquid inlet pipe 4 and the liquid outlet pipe 5, and a circulating pump 10 is installed on the liquid inlet pipe 4.

[0031] A second filling port 9 for injecting lubricating oil is arranged on the same end face of the shell 1 and the cooling box 7, and a first filling port 8 for injecting coolant is arranged on the cooling box 7. Sealing plugs are arranged in the open ends of the first filling port 8 and the second filling port 9, and the arc cooling pipe 3, the liquid inlet pipe 4, the liquid outlet pipe 5 and the cooling elbow 6 are all injected with coolant.

[0032] During operation, in order to be able to circulate and cool down the reducer in this scheme to ensure the heat dissipation and cooling effect, in this scheme, by controlling the operation of the circulation pump 10, the circulation pump 10 will circulate the coolant in the cooling elbow 6, the liquid outlet pipe 5, the liquid inlet pipe 4, and the arc cooling pipe 3, so that the coolant after absorbing heat in the arc cooling pipe 3 passes into the cooling elbow 6, and when the coolant after absorbing heat enters the cooling elbow 6, it will be cooled by the coolant in the cooling box 7, and the cooled coolant will enter the arc cooling pipe 3 through the liquid inlet pipe 4 again, and then circulate and cool down, so as to achieve the cooling and cooling effect of the reducer and ensure the cooling and heat dissipation effect.

[0033] See also Figure 1 and Figure 5 As shown, the centrifugal brake assembly includes a fixed block 16, and the fixed block 16 is installed on the output shaft 11. The fixed block 16 is provided with an engaging groove 17 on the side opposite to the output shaft 11. An engaging block 18 is slidably arranged in the engaging groove 17. A cavity 19 is provided in the engaging block 18. Two holes are symmetrically arranged on the side wall of the cavity 19 close to the output shaft 11. Two limiting rods 20 are respectively penetrated in the two holes. The top ends of the two limiting rods 20 are respectively installed on the top of the cavity 19, and the lower ends of the two cavities 19 are respectively installed in the bottom of the engaging groove 17. Springs 21 are respectively sleeved on the two limiting rods 20, and the springs 21 are located in the cavity 19.

[0034] The two limiting rods 20 are parallel to each other, and the limiting rod 20 and the output shaft 11 are perpendicular to each other.

[0035] During operation, in order to enable the reducer in this solution to brake after being damaged and to prevent the cargo from falling after the reducer is damaged, in this solution, the spring 21 in the initial state will always push the inner bottom of the cavity 19 toward the output shaft 11, so that the engaging block 18 remains engaged in the engaging groove 17. At this time, the rotation trajectory of the engaging block 18 and the fixing block 16 around the output shaft 11 will be located within the two blocks 15. When the reducer is damaged, the output shaft 11 will be driven to rotate rapidly under the action of the cargo weight. When the output shaft 11 rotates rapidly, the engaging block 18 will be thrown out of the engaging groove 17 under the action of centrifugal force. When the output shaft 11 rotates rapidly When the centrifugal force of the swinging engaging block 18 is greater than the pushing force of the spring 21, the engaging block 18 will be thrown out of the engaging groove 17. At this time, the engaging block 18 will extend out of the engaging groove 17, and the rotation trajectory of the engaging block 18 around the output shaft 11 will intersect with the two blocks 15 and will be blocked by the two blocks 15. When the two engaging blocks 18 are blocked by the two blocks 15, the output shaft 11 cannot rotate, and under the action of the gravity of the falling goods, the engaging block 18 and the block 15 will fit tightly, so that the goods lifted by the output shaft 11 cannot fall down. The cooperation achieves the effect of improving the safety of use and effectively ensures the safety of the operator.

[0036] A through hole is penetrated through the side of the top cover 13, and the output shaft 11 is penetrated through the through hole of the top cover 13, the center line of the sleeve 14 coincides with the center line of the output shaft 11, and a gear reduction module 12 for transmission is arranged in the housing 1, and the gear reduction module 12 is meshed with the output shaft 11.

[0037] The heat dissipation fins 2 are parallel to the center line of the housing 1 , the arc cooling tube 3 is horizontally arranged in a semicircular shape around the center line of the housing 1 , and a sealed bearing is arranged between the output shaft 11 and the through hole set in the top cover 13 .

[0038] Working principle: by pouring lubricating oil into the shell 1, the reducer will cooperate with the output shaft 11 through the gear reduction module 12 when running, and the heat emitted will be absorbed by the lubricating oil therein, and the lubricating oil will flow in the shell 1 under the operation of the gear reduction module 12 and the output shaft 11. When the lubricating oil in the shell 1 flows, the heat will be transferred to the shell 1 and dissipated from the shell 1. The heat dissipation fins 2 evenly distributed on the upper part of the shell 1 will increase the heat dissipation area, thereby improving the heat dissipation speed, and by arranging the arc cooling pipe 3 in a transverse manner on one side of the heat dissipation fin 2 located in the shell 1, the coolant in the arc cooling pipe 3 will cool the heat dissipation fin 2 and the lubricating oil in the shell 1, and cooperate with the circulating cooling component to circulate the external coolant into the arc cooling pipe 3, thereby improving the cooling effect, and the arc cooling The coolant circulating out of the pipe 3 will also be cooled by the circulating cooling component, and then used for circulating cooling. During normal use, the output shaft 11 will rotate slowly. When the output shaft 11 is aged and broken, the output shaft 11 will rotate rapidly under the weight of the cargo. When the output shaft 11 rotates rapidly, the two sets of centrifugal brake components mirror-set thereon will be unfolded. After the two sets of centrifugal brake components are unfolded, their rotation trajectories around the output shaft 11 will intersect with the two blocks 15 installed in the sheath 14 and be blocked by the two blocks 15. Then, the two sets of centrifugal brake components and the two blocks 15 cooperate to prevent the output shaft 11 from rotating, and the cargo is prevented from falling. The cooperation achieves the effect of cooling the reducer, avoids heat accumulation affecting the normal use of the reducer, and can avoid the cargo from falling after the reducer is damaged, thereby improving the safety of use.

[0039] By controlling the operation of the circulation pump 10, the circulation pump 10 will circulate the coolant in the cooling elbow 6, the liquid outlet pipe 5, the liquid inlet pipe 4, and the arc cooling pipe 3, so that the coolant after absorbing heat in the arc cooling pipe 3 can enter the cooling elbow 6. When the coolant after absorbing heat enters the cooling elbow 6, it will be cooled by the coolant in the cooling box 7. The cooled coolant will enter the arc cooling pipe 3 again through the liquid inlet pipe 4, and then circulate and cool down, so as to achieve the cooling and cooling effect of the reducer and ensure the cooling and heat dissipation effect.

[0040] In the initial state, the spring 21 will always push the inner bottom of the cavity 19 toward the output shaft 11, so that the engaging block 18 remains engaged in the engaging groove 17. At this time, the rotation trajectory of the engaging block 18 and the fixing block 16 around the output shaft 11 will be located within the two blocks 15. When the reducer is damaged, the output shaft 11 will rotate rapidly under the action of the weight of the cargo. When the output shaft 11 rotates rapidly, the engaging block 18 will be thrown out of the engaging groove 17 under the action of the centrifugal force. When the output shaft 11 rotates rapidly, the centrifugal force of the engaging block 18 is greater than the pushing force of the spring 21. The engaging block 18 will be thrown out of the engaging groove 17. At this time, the engaging block 18 will extend out of the engaging groove 17, and the rotation trajectory of the engaging block 18 around the output shaft 11 will intersect with the two blocks 15 and will be blocked by the two blocks 15. When the two engaging blocks 18 are blocked by the two blocks 15, the output shaft 11 cannot rotate, and under the action of the gravity of the cargo falling, the engaging block 18 and the block 15 will fit tightly, so that the cargo lifted by the output shaft 11 cannot fall downward. The cooperation achieves the effect of improving the safety of use and effectively ensures the safety of the operator.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A heavy-load hoist reducer, characterized in that: The invention comprises a shell (1); heat dissipation fins (2) are evenly distributed and installed on the upper side wall of the shell (1), and the heat dissipation fins (2) are arranged through the shell (1); arc-shaped cooling pipes (3) are arranged transversely between the evenly distributed heat dissipation fins (2), and the arc-shaped cooling pipes (3) are located in the shell (1); an output shaft (11) is rotatably arranged in the shell (1), and a circulating cooling component is arranged at one end of the shell (1) opposite to the output shaft (11); A top cover (13) is arranged in an opening at one end of the housing (1) opposite to the cooling assembly, a sheath (14) is installed on the side of the top cover (13) opposite to the housing (1), a stopper (15) is symmetrically installed in the sheath (14), and two sets of centrifugal brake assemblies are mirror-imaged on the end of the output shaft (11) opposite to the top cover (13) and the housing (1), and the two sets of centrifugal brake assemblies are located in the sheath (14); The rotation tracks of the two sets of centrifugal brake components around the output shaft (11) are located between the two stoppers (15).

2. A heavy-load hoist reducer according to claim 1, characterized in that: The circulating cooling component comprises a cooling box (7), and the cooling box (7) is mounted on the end surface of the outer shell (1) opposite to the output shaft (11), a cooling elbow (6) is arranged in a Z-shape in the cooling box (7), a liquid inlet pipe (4) and a liquid outlet pipe (5) are respectively mounted on both sides of the cooling box (7), and the openings at both ends of the cooling box (7) are respectively connected to the liquid inlet pipe (4) and the liquid outlet pipe (5), and the two ends of the arc cooling pipe (3) arranged transversely in the outer shell (1) respectively penetrate the outer shell (1) and are connected to the liquid inlet pipe (4) and the liquid outlet pipe (5), and a circulating pump (10) is mounted on the liquid inlet pipe (4).

3. A heavy-load hoist reducer according to claim 2, characterized in that: A second filling port (9) for injecting lubricating oil is arranged on the same end surface of the shell (1) and the cooling box (7), and a first filling port (8) for injecting cooling liquid is arranged on the cooling box (7). Sealing plugs are arranged in the opening ends of the first filling port (8) and the second filling port (9), and the arc-shaped cooling pipe (3), the liquid inlet pipe (4), the liquid outlet pipe (5) and the cooling elbow pipe (6) are all injected with cooling liquid.

4. A heavy-load hoist reducer according to claim 1, characterized in that: The centrifugal brake assembly comprises a fixed block (16), and the fixed block (16) is mounted on the output shaft (11); a fitting groove (17) is provided on a side of the fixed block (16) opposite to the output shaft (11); a fitting block (18) is slidably arranged in the fitting groove (17); a cavity (19) is provided in the fitting block (18); two holes are symmetrically arranged on a side wall of the cavity (19) close to the output shaft (11); two limiting rods (20) are respectively penetrated in the two holes; the top ends of the two limiting rods (20) are respectively mounted on the top of the cavity (19), and the lower ends of the two cavities (19) are respectively mounted on the bottom of the fitting groove (17); springs (21) are respectively sleeved on the two limiting rods (20), and the springs (21) are located in the cavity (19).

5. A heavy-load hoist reducer according to claim 4, characterized in that: The two limiting rods (20) are parallel to each other, and the limiting rod (20) and the output shaft (11) are perpendicular to each other.

6. A heavy-load hoist reducer according to claim 1, characterized in that: A through hole is provided on the side of the top cover (13), and the output shaft (11) is provided in the through hole of the top cover (13). The center line of the sleeve (14) coincides with the center line of the output shaft (11). A gear reduction module (12) for transmission is provided in the housing (1), and the gear reduction module (12) is meshed with the output shaft (11).

7. A heavy-load hoist reducer according to claim 1, characterized in that: The heat dissipation fins (2) are parallel to the center line of the outer shell (1), the arc-shaped cooling pipe (3) is arranged horizontally in a semicircular arc shape around the center line of the outer shell (1), and a sealed bearing is arranged between the output shaft (11) and the through hole arranged in the top cover (13).

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