Pneumatic hoist with limiting protection function

Abstract

The utility model relates to the technical field of hoisting equipment, in particular to a pneumatic hoist with a limiting protection function, which comprises a pneumatic hoist body and an L-shaped support, the bottom of the pneumatic hoist body is fixedly connected with a lifting hook through a chain, and the L-shaped support is fixedly connected to the left side of the outer wall of the pneumatic hoist body. The pressure sensor is electrically connected with a control system of the pneumatic hoist body, so that a signal is transmitted to the control system of the pneumatic hoist body, the pneumatic hoist body is further controlled to stop working, the limiting protection effect is achieved, the situation that a workpiece falls due to chain breakage is avoided, meanwhile, the pneumatic hoist body is protected, and the service life of the pneumatic hoist body is prolonged. When the motor is started, the lead screw is driven to rotate, the lead screw drives the movable block on the outer wall of the lead screw to move up and down, and the mounting plate drives the pressure sensor to move, so that the height of the pressure sensor can be adjusted according to the working requirement of the height distance of a hoisted workpiece, adjustment is convenient, and use is flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a pneumatic hoist with a position limiting protection function. Background Art

[0002] As the country's awareness of production safety increases, electric hoists will gradually withdraw from the historical stage in certain flammable and explosive occasions. Pneumatic hoists use compressed air as a power source, which is convenient, fast and efficient. Their explosion-proof performance has also been widely recognized by all walks of life. Therefore, pneumatic hoists will play an important role in future corporate production safety.

[0003] Current pneumatic hoists ignore the limit function for lifting workpieces. In actual use, it is often only necessary to lift the workpiece a short distance to meet the working requirements. However, when encountering long-distance lifting or the operator forgets to press the stop switch, the workpiece will continue to be lifted and the chain may break and the workpiece may fall. Utility Model Content

[0004] The purpose of the utility model is to provide a pneumatic hoist with a limit protection function, which can prevent the workpiece from falling due to chain breakage, and has the characteristics of high safety, easy adjustment and flexible use.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pneumatic hoist with a limit protection function, comprising a pneumatic hoist body and an L-shaped bracket, the bottom of the pneumatic hoist body being fixedly connected to a hook by a chain, the L-shaped bracket being fixedly connected to the left side of the outer wall of the pneumatic hoist body, the inner upper side of the L-shaped bracket being fixedly connected to an end plate, a screw rod being rotatably connected between the end plate and the inner bottom end of the L-shaped bracket, a movable block being movably connected to the outer wall of the screw rod, the end of the movable block being fixedly connected to a connecting plate close to the chain, the other end of the connecting plate being fixedly connected to a mounting plate, a pressure sensor being arranged below the mounting plate, a sliding rod being fixedly connected to the left side of the lower end face of the pneumatic hoist body, and the connecting plate being slidably connected to the outer wall of the sliding rod.

[0006] In order to buffer the pressure sensor, as a preferred pneumatic hoist with a limit protection function of the utility model, a telescopic tube is arranged between the connecting plate and the pressure sensor, and the telescopic tube includes an outer tube fixedly connected to the lower end surface of the connecting plate, and an inner column is slidably connected to the interior of the outer tube, and a spring is arranged between the top end of the inner column and the top end of the inner part of the outer tube.

[0007] In order to accurately control the height of the pressure sensor, as a preferred pneumatic hoist with a limit protection function of the present invention, the outer wall of the sliding rod is provided with scale lines.

[0008] In order to drive the screw to rotate, as a preferred pneumatic hoist with a limit protection function of the utility model, a motor is installed on the upper end surface of the end plate, and the output end of the motor is fixedly connected to the screw.

[0009] In order to contact and press the pressure sensor, as a preferred pneumatic hoist with a limit protection function of the utility model, a touch plate located directly below the pressure sensor is fixedly connected to the left side of the outer wall of the hook.

[0010] In order to protect the parts, as a preferred pneumatic hoist with a limit protection function of the utility model, the outer sides of the L-shaped bracket, end plate, screw rod, movable block, connecting plate and sliding rod are provided with an outer shell fixedly connected to the left side of the outer wall of the pneumatic hoist body, and the outer wall of the outer shell is provided with multiple evenly distributed heat dissipation ports.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] When the workpiece is hoisted, the chain drives the hook to rise, and the hook drives the touch plate to move up during the rising process. The touch plate moves up and contacts the pressure sensor, and squeezes the pressure sensor. The pressure sensor is electrically connected to the control system of the pneumatic hoist body, so the signal is transmitted to the control system of the pneumatic hoist body, which further controls the pneumatic hoist body to stop working, thereby playing a limit protection effect, avoiding the situation where the chain breaks and the workpiece falls, and also protecting the pneumatic hoist body, with high safety.

[0013] When the motor is started, it drives the screw to rotate, and the screw drives the movable block on its outer wall to move up and down. The movable block drives the mounting plate to move through the connecting plate, and the mounting plate drives the pressure sensor to move, so that the height of the pressure sensor can be adjusted according to the working requirements of the height distance of the lifting workpiece. The adjustment is convenient and the use is flexible. During the up and down movement of the connecting plate, it slides on the outer wall of the slide rod to play a limiting effect, making the adjustment of the pressure sensor more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the overall cross-sectional structural diagram of the utility model;

[0015] Figure 2 This is a partial cross-sectional structural diagram of the utility model;

[0016] Figure 3 This is the overall external structure diagram of the utility model.

[0017] In the figure: 1. Pneumatic hoist body; 2. Chain; 3. Hook; 4. L-shaped bracket; 5. End plate; 6. Screw; 7. Movable block; 8. Connecting plate; 9. Mounting plate; 10. Pressure sensor; 11. Sliding rod; 12. Telescopic tube; 13. Outer cylinder; 14. Inner column; 15. Spring; 16. Scale line; 17. Motor; 18. Touch panel; 19. Housing; 20. Heat dissipation vent. DETAILED DESCRIPTION

[0018] See also Figures 1 to 3 , a pneumatic hoist with a limit protection function, includes a pneumatic hoist body 1 and an L-shaped bracket 4. The bottom of the pneumatic hoist body 1 is fixedly connected to a hook 3 through a chain 2. The L-shaped bracket 4 is fixedly connected to the left side of the outer wall of the pneumatic hoist body 1. An end plate 5 is fixedly connected to the upper inner side of the L-shaped bracket 4. A screw rod 6 is rotatably connected between the end plate 5 and the inner bottom end of the L-shaped bracket 4. The outer wall of the screw rod 6 is movably connected to a movable block 7. The end of the movable block 7 close to the chain 2 is fixedly connected to a connecting plate 8, and the other end of the connecting plate 8 is fixedly connected to a mounting plate 9. A pressure sensor 10 is provided below the mounting plate 9. A sliding rod 11 is fixedly connected to the left side of the lower end surface of the pneumatic hoist body 1, and the connecting plate 8 is slidably connected to the outer wall of the sliding rod 11.

[0019] In this embodiment, when the workpiece is hoisted and lifted, the chain 2 drives the hook 3 to rise, and during the rising process of the hook 3, the touch plate 18 is driven to move upward, and the touch plate 18 moves upward to contact the pressure sensor 10 and squeeze the pressure sensor 10. The pressure sensor 10 is electrically connected to the control system of the pneumatic hoist body 1, and thus transmits a signal to the control system of the pneumatic hoist body 1, which further controls the pneumatic hoist body 1 to stop working, thereby achieving a limit protection effect, avoiding the situation where the chain 2 breaks and the workpiece falls, and also protecting the pneumatic hoist body 1, with high safety.

[0020] When the motor 17 is started, it drives the screw rod 6 to rotate, and the screw rod 6 drives the movable block 7 on its outer wall to move up and down. The movable block 7 drives the mounting plate 9 to move through the connecting plate 8, and the mounting plate 9 drives the pressure sensor 10 to move, so that the height of the pressure sensor 10 can be adjusted according to the working requirements of the height distance of the lifting workpiece. The adjustment is convenient and the use is flexible. During the up and down movement of the connecting plate 8, it slides on the outer wall of the slide rod 11, which has a limiting effect, making the adjustment of the pressure sensor 10 more stable.

[0021] As a technical optimization solution of the present invention, a telescopic tube 12 is arranged between the connecting plate 8 and the pressure sensor 10. The telescopic tube 12 includes an outer tube 13 fixedly connected to the lower end surface of the connecting plate 8. The inner part of the outer tube 13 is slidably connected to the inner part of the inner column 14. A spring 15 is arranged between the top end of the inner column 14 and the top end of the inner part of the outer tube 13.

[0022] In this embodiment, the inner column 14 is slidably connected to the inside of the outer cylinder 13. When the pressure sensor 10 is squeezed by the touch plate 18, the spring 15 can contract, thereby having a buffering effect and preventing the pressure sensor 10 from being damaged by excessive impact.

[0023] As a technical optimization solution of the present invention, scale lines 16 are provided on the outer wall of the slide rod 11 .

[0024] In this embodiment, the outer wall of the slide rod 11 is provided with scale lines 16 . By providing the scale lines 16 , the height of the pressure sensor 10 can be accurately adjusted according to the situation.

[0025] As a technical optimization solution of the present invention, a motor 17 is installed on the upper end surface of the end plate 5 , and the output end of the motor 17 is fixedly connected to the screw rod 6 .

[0026] In this embodiment, a motor 17 is installed on the upper end surface of the end plate 5, and the motor 17 is convenient for driving the screw rod 6 to rotate.

[0027] As a technical optimization solution of the present invention, a touch plate 18 located directly below the pressure sensor 10 is fixedly connected to the left side of the outer wall of the hook 3 .

[0028] In this embodiment, the touch panel 18 is located directly below the pressure sensor 10 , so that the hook 3 can rise and press the pressure sensor 10 .

[0029] As a technical optimization solution of the present invention, the outer side of the L-shaped bracket 4, the end plate 5, the screw 6, the movable block 7, the connecting plate 8 and the slide rod 11 is provided with an outer shell 19 fixedly connected to the left side of the outer wall of the pneumatic hoist body 1, and the outer wall of the outer shell 19 is provided with a plurality of evenly distributed heat dissipation openings 20.

[0030] In this embodiment, the housing 19 is convenient for protecting multiple components, and the heat dissipation vents 20 are convenient for dissipating heat.

[0031] Working principle: When the workpiece is lifted, the chain 2 drives the hook 3 to rise, and the hook 3 drives the touch plate 18 to move up during the rising process. The touch plate 18 moves up and contacts the pressure sensor 10, and squeezes the pressure sensor 10. The pressure sensor 10 is electrically connected to the control system of the pneumatic hoist body 1, so the signal is transmitted to the control system of the pneumatic hoist body 1, and the pneumatic hoist body 1 is further controlled to stop working, thereby playing a limiting protection effect. When the motor 17 is started, it drives the screw rod 6 to rotate, and the screw rod 6 drives the movable block 7 on its outer wall to move up and down. The movable block 7 drives the mounting plate 9 to move through the connecting plate 8, and the mounting plate 9 drives the pressure sensor 10 to move, so that the height of the pressure sensor 10 can be adjusted according to the working requirements of the height distance of the lifting workpiece. It is easy to adjust and flexible to use. During the up and down movement of the connecting plate 8, it slides on the outer wall of the slide bar 11, which plays a limiting effect, making the adjustment of the pressure sensor 10 more stable.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pneumatic hoist with a limit protection function, comprising a pneumatic hoist body (1) and an L-shaped bracket (4), characterized in that: The bottom of the pneumatic hoist body (1) is fixedly connected to a hook (3) through a chain (2), the L-shaped bracket (4) is fixedly connected to the left side of the outer wall of the pneumatic hoist body (1), the upper inner side of the L-shaped bracket (4) is fixedly connected to an end plate (5), a screw rod (6) is rotatably connected between the end plate (5) and the inner bottom end of the L-shaped bracket (4), the outer wall of the screw rod (6) is movably connected to a movable block (7), the movable block (7) is fixedly connected to a connecting plate (8) at one end close to the chain (2), the other end of the connecting plate (8) is fixedly connected to a mounting plate (9), a pressure sensor (10) is provided below the mounting plate (9), the left side of the lower end surface of the pneumatic hoist body (1) is fixedly connected to a sliding rod (11), and the connecting plate (8) is slidably connected to the outer wall of the sliding rod (11).

2. The pneumatic hoist with position limiting protection function according to claim 1, characterized in that: A telescopic tube (12) is provided between the connecting plate (8) and the pressure sensor (10), and the telescopic tube (12) includes an outer tube (13) fixedly connected to the lower end surface of the connecting plate (8), an inner column (14) is slidably connected inside the outer tube (13), and a spring (15) is provided between the top end of the inner column (14) and the top end inside the outer tube (13).

3. The pneumatic hoist with position limiting protection function according to claim 1, characterized in that: The outer wall of the slide rod (11) is provided with scale lines (16).

4. The pneumatic hoist with position limiting protection function according to claim 1, characterized in that: A motor (17) is mounted on the upper end surface of the end plate (5), and an output end of the motor (17) is fixedly connected to the screw rod (6).

5. The pneumatic hoist with position limiting protection function according to claim 1, characterized in that: A touch plate (18) located directly below the pressure sensor (10) is fixedly connected to the left side of the outer wall of the hook (3).

6. The pneumatic hoist with position limiting protection function according to claim 1, characterized in that: The outer sides of the L-shaped bracket (4), the end plate (5), the screw rod (6), the movable block (7), the connecting plate (8) and the sliding rod (11) are provided with a shell (19) fixedly connected to the left side of the outer wall of the pneumatic hoist body (1), and the outer wall of the shell (19) is provided with a plurality of evenly distributed heat dissipation openings (20).

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