Overload control for pneumatic winch

Abstract

The utility model discloses an overload control device of pneumatic winch, including deceleration pneumatic motor, pneumatic winch, shaft coupling, rotary gas distribution valve, pneumatic alarm and brake control valve. Deceleration pneumatic motor is driven with pneumatic winch through shaft coupling, and is provided with a plurality of springs between the left wheel disc and the right wheel disc of shaft coupling, and the outside of the transmission shaft of deceleration pneumatic motor is provided with rotary gas distribution valve, and the left wheel disc of shaft coupling is provided with pneumatic travel switch, and the right connecting axle block of right wheel disc is provided with travel block. When the pneumatic winch is overloaded, the deceleration pneumatic motor rotates, the spring between the left wheel disc and the right wheel disc is compressed, the travel block triggers the pneumatic travel switch, and the compressed air that flows back to the rotary gas distribution valve drives the pneumatic alarm to work or drives the brake control valve to work in emergency brake, which effectively prevents the safety accident caused by overload.

Description

Technical Field

[0001] This utility model relates to an overload control device for a pneumatic winch, and pertains to the field of pneumatic hoisting equipment technology. Background Technology

[0002] Currently, pneumatic winches on the market have advantages such as strong load-bearing capacity and ease of use, but safety accidents caused by overloading during hoisting are frequent; therefore, it is necessary to design pneumatic winches to prevent overloading. Summary of the Invention

[0003] The purpose of this utility model is to provide an overload control device for a pneumatic winch to prevent safety accidents caused by overload during hoisting.

[0004] In view of the above-mentioned technical problems, this utility model provides an overload control device for a pneumatic winch, including a geared pneumatic motor, a pneumatic winch, a coupling, a rotary air distribution valve, and a pneumatic alarm. A coupling is provided between the drive shaft of the geared pneumatic motor and the rotating shaft of the pneumatic winch; the left wheel of the coupling is mounted on the drive shaft, and the right wheel of the coupling is mounted on the rotating shaft; a spring is provided between the left connecting block of the left wheel and the right connecting block of the right wheel; a rotary air distribution valve is provided outside the drive shaft, with an inlet valve pipe and an exhaust valve pipe on the valve body, and an inlet air passage and a return air passage on the valve core. A pneumatic limit switch is provided on the left connecting block of the left wheel, and a limit block is provided on the right connecting block of the right wheel. An inlet pipe and an exhaust pipe are connected to the pneumatic limit switch; the inlet pipe communicates with the inlet air passage, and the exhaust pipe communicates with the return air passage. A pneumatic alarm is installed on the exhaust valve pipe. When the pneumatic winch is overloaded, the drive shaft of the reduction pneumatic motor rotates, the spring between the left and right wheel discs is compressed, and the stroke block triggers the pneumatic limit switch. The compressed air in the intake pipe of the pneumatic limit switch enters the rotary valve through the exhaust pipe and is discharged. The compressed air is discharged from the exhaust valve pipe of the rotary valve, driving the pneumatic alarm to work.

[0005] Preferably, the pneumatic winch's brake control valve is equipped with a pneumatic emergency stop device. The cylinder of the pneumatic emergency stop device is connected to the exhaust valve pipe of the rotary air distribution valve via an air pipe. When the pneumatic winch is overloaded, the compressed air in the air pipe drives the cylinder, opening the brake control valve to perform emergency braking. When the compressed air in the air pipe disappears, the cylinder closes the brake control valve under the action of the return spring, and the braking operation stops.

[0006] Based on the above technical solution, this utility model has at least one of the following beneficial effects: 1. This utility model provides a method to achieve pneumatic alarm and emergency stop braking when overloaded by setting a coupling with flexible transmission of spring torque between the pneumatic winch and the reduction pneumatic motor, and by setting a pneumatic limit switch and a rotary air distribution valve on the coupling, thereby effectively preventing safety accidents caused by overload of the pneumatic winch. 2. The transmission speed between the pneumatic winch and the geared pneumatic motor is relatively slow. A rotary air distribution valve structure is used for air distribution, which is structurally stable and has good sealing performance. 3. The coupling adopts spring torque flexible transmission, and the spring force can be set according to the load range of the pneumatic winch to effectively control overload; the coupling reduces the impact force between the pneumatic motor and the reducer due to sudden braking through flexible transmission, thus extending service life. Attached Figure Description

[0007] Figure 1 This is a structural schematic diagram of an overload control device for a pneumatic winch according to this utility model.

[0008] Figure 2 This is a schematic diagram of the overload control device for a pneumatic winch according to this utility model.

[0009] Explanation of main symbols in the attached diagram 1-Reduction pneumatic motor; 2-Drive shaft; 3-Pneumatic winch; 4-Rotating shaft; 5-Coupling; 6-Left wheel; 7-Right wheel; 8-Left connecting block; 9-Right connecting block; 10-Spring; 11-Rotary air distribution valve; 12-Pneumatic limit switch; 13-Valve core; 14-Inlet air passage; 15-Return air passage; 16-Inlet pipe; 17-Exhaust pipe; 18-Valve body; 19-Exhaust valve pipe; 20-Stroke block; 21-Inlet valve pipe; 22-Pneumatic alarm; 24-Air pipe; 25-Brake control valve; 26-Pneumatic emergency stop device; 27-Cylinder; 28-Reset spring. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0011] like Figure 1 , Figure 2As shown, an overload control device for a pneumatic winch includes a geared pneumatic motor 1, a coupling 5, a rotary air distribution valve 11, a pneumatic limit switch 12, and a pneumatic alarm 22. A coupling 5 is installed between the drive shaft 2 of the geared pneumatic motor 1 and the rotating shaft 4 of the pneumatic winch 3. The left wheel 6 of the coupling 5 is mounted on the drive shaft 2 of the geared pneumatic motor 1, and the right wheel 7 of the coupling 5 is mounted on the rotating shaft 4 of the pneumatic winch 3. A spring 10 is installed between the left connecting block 8 on the left wheel 6 and the right connecting block 9 on the right wheel 7 of the coupling 5. A rotary air distribution valve 11 is installed outside the drive shaft 2. An inlet valve pipe 21 and an exhaust valve pipe 19 are installed on the valve body 18 of the rotary air distribution valve 11. An inlet air passage 14 and a return air passage 15 are installed on the valve core 13 of the rotary air distribution valve 11. A pneumatic limit switch 12 is installed on the left connecting block 8 of the left wheel 6 of the coupling 5, and a stroke block 20 is installed on the right connecting block 9 of the right wheel 7 of the coupling 5. The pneumatic limit switch 12 is connected to an air inlet pipe 16 and an exhaust pipe 17. The air inlet pipe 16 is connected to the air inlet channel 14, and the exhaust pipe 17 is connected to the air return channel 15. A pneumatic alarm 22 is installed on the exhaust valve pipe 19. When the pneumatic winch 3 is overloaded, the shaft 4 of the pneumatic winch 3 does not rotate, the drive shaft 2 of the reduction pneumatic motor 1 rotates, the spring 10 between the left wheel 6 and the right wheel 7 is compressed, and the stroke block 20 triggers the pneumatic limit switch 12. The compressed air in the air inlet pipe 16 of the pneumatic limit switch 12 enters the rotary air distribution valve 11 through the exhaust pipe 17 and is discharged. The compressed air is discharged from the exhaust valve pipe 19 of the valve body 18, driving the pneumatic alarm 22 to work. The pneumatic winch 3 has a pneumatic emergency stop device 26 installed on its brake control valve 25. An air pipe 24 is connected to the exhaust valve pipe 19 of the valve body 18 of the rotary air distribution valve 11, and the air pipe 24 is connected to the cylinder 27 of the pneumatic emergency stop device 26. When the pneumatic winch 3 is not overloaded, the compressed air in the air pipe 24 disappears, and the cylinder 27 closes the brake control valve 25 under the action of the return spring 28, stopping the braking operation. When the pneumatic winch 3 is overloaded, the compressed air in the air pipe 24 drives the cylinder 27, and the brake control valve 25 automatically opens to perform emergency braking.

[0012] This concludes the description of the embodiments of this utility model.

[0013] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An overload control device for a pneumatic winch, characterized in that, include: A coupling (5) is provided between the drive shaft (2) of the reduction pneumatic motor (1) and the rotating shaft (4) of the pneumatic winch (3); the left wheel (6) of the coupling (5) is mounted on the drive shaft (2), and the right wheel (7) of the coupling (5) is mounted on the rotating shaft (4); a spring (10) is provided between the left connecting block (8) of the left wheel (6) and the right connecting block (9) of the right wheel (7); a rotary air distribution valve (11) is provided outside the drive shaft (2), and an inlet valve is provided on the valve body (18) of the rotary air distribution valve (11). The rotary valve (11) has an air valve pipe (21) and an exhaust valve pipe (19). The valve core (13) of the rotary valve (11) is provided with an intake air passage (14) and a return air passage (15). The left connecting block (8) of the left wheel (6) is provided with a pneumatic limit switch (12), and the right connecting block (9) of the right wheel (7) is provided with a stroke block (20). The pneumatic limit switch (12) is connected to an intake pipe (16) and an exhaust pipe (17). The intake pipe (16) is connected to the intake air passage (14), and the exhaust pipe (17) is connected to the return air passage (15). A pneumatic alarm (22) is installed on the exhaust valve pipe (19). When the pneumatic winch (3) is overloaded, the drive shaft (2) of the deceleration pneumatic motor (1) rotates, the spring (10) between the left wheel (6) and the right wheel (7) is compressed, the stroke block (20) triggers the pneumatic stroke switch (12), the compressed air in the air inlet pipe (16) of the pneumatic stroke switch (12) enters the rotary air distribution valve (11) through the exhaust pipe (17) and is discharged. The compressed air is discharged from the exhaust valve pipe (19) of the valve body (18) and drives the pneumatic alarm (22) to work.

2. The overload control device for a pneumatic winch according to claim 1, characterized in that: The pneumatic winch (3) is equipped with a pneumatic emergency stop device (26) on the brake control valve (25). An air pipe (24) is connected to the exhaust valve pipe (19) of the valve body (18). The air pipe (24) is connected to the cylinder (27) of the pneumatic emergency stop device (26). When the pneumatic winch (3) is overloaded, the compressed air in the air pipe (24) drives the cylinder (27), and the brake control valve (25) opens to perform emergency braking. When the compressed air in the air pipe (24) disappears, the cylinder (27) closes the brake control valve (25) under the action of the return spring (28), and the braking operation stops.

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