Safety switch device of pneumatic scraper knife

Abstract

The utility model relates to a pneumatic scraper knife safety switch device which comprises a body, an air cylinder arranged on the front portion of the body, a piston and a piston sleeve arranged in a cavity defined by the body and the air cylinder, an air inlet valve installed on the rear portion of the body, a trigger assembly installed on the upper portion of the body and an opening and closing pin assembly arranged on the lower portion of the body. The trigger assembly abuts against the opening and closing pin assembly. The device is arranged at the trigger component of the pneumatic scraper knife, so that the high-pressure air for driving the pneumatic scraper knife can be absolutely sealed under the condition that the trigger of the pneumatic scraper knife is not operated, the accidental starting of the pneumatic scraper knife caused by the leakage of the high-pressure air is prevented, and the safety of a pneumatic scraper knife user is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic tools, and particularly relates to a safety switch device for a pneumatic chisel. Background Art

[0002] The pneumatic chisel is a commonly used pneumatic tool. It drives the chisel to reciprocate through high-pressure air for work. Its working principle is that by pressing the switch wrench of the pneumatic chisel, high-pressure air enters the cylinder to realize the work of the pneumatic chisel. However, the existing pneumatic chisels do not have safety devices. When the switch wrench is accidentally pressed, it is easy to cause the accidental start of the pneumatic chisel, threatening the safety of the users of the pneumatic chisel. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a safety switch device for a pneumatic chisel to solve the problems in the above-mentioned background art.

[0004] To achieve the above purpose, the present application is realized through the following technical solutions:

[0005] A safety switch device for a pneumatic chisel includes a body. A cylinder is arranged at the front part of the body. A piston and a piston sleeve are arranged in the cavity formed between the body and the cylinder. An intake valve is installed at the rear part of the body. A trigger assembly is installed at the upper part of the body. An opening and closing pin assembly is arranged at the lower part of the body. The trigger assembly abuts against the opening and closing pin assembly.

[0006] Further, a knob is arranged on the intake valve. A rotating shaft connected to the knob extends into the air flow channel of the intake valve. An intake hole penetrating radially is arranged on the rotating shaft. The intake hole is used to adjust the opening degree of the air flow channel.

[0007] Further, the opening and closing pin assembly includes an opening and closing pin, a spring and an opening and closing pin cover. The opening and closing pin is arranged in the body, and one end of the opening and closing pin passes through the body and abuts against the trigger assembly. The opening and closing pin cover is threadedly connected to the body. The spring is arranged between the opening and closing pin cover and the lower end of the opening and closing pin.

[0008] Further, a first sealing ring and a second sealing ring are sleeved at the place where the opening and closing pin passes through the body.

[0009] Further, the trigger assembly includes a trigger, a pressure spring, a safety pin, a first connecting shaft and a second connecting shaft. The rear end of the trigger is rotatably connected to the body through the first connecting shaft. The second connecting shaft sequentially passes through the pressure spring and the safety pin and then is inserted into the trigger near the front end. The other end of the pressure spring abuts against the body.

[0010] Further, the trigger includes a trigger body. A first convex part extending downward is provided at the rear end of the trigger body. A first rotating shaft through hole is provided on the first convex part. A second convex part extending downward is provided near the front end of the trigger body. A second rotating shaft through hole is provided on the second convex part.

[0011] Further, the safety pin includes a safety pin body. The safety pin body is bent. An upward arc-shaped convex part is provided at the center rear of the safety pin body. A through hole is provided at the position corresponding to the arc-shaped convex part on the safety pin body.

[0012] Further, both ends of the safety pin body are arc-shaped.

[0013] The beneficial effects of the present utility model are:

[0014] By arranging at the trigger assembly of the pneumatic shovel, this device can ensure that the high-pressure air driving the pneumatic shovel is absolutely sealed when the trigger of the pneumatic shovel is not operated, preventing the accidental start of the pneumatic shovel caused by the leakage of high-pressure air and protecting the safety of the users of the pneumatic shovel. Description of the Drawings

[0015] Figure 1 It is an exploded view of the pneumatic shovel of the present utility model.

[0016] Figure 2 It is an axial sectional view of the pneumatic shovel of the present utility model.

[0017] Figure 3 It is a schematic diagram of the air flow direction of the pneumatic shovel of the present utility model.

[0018] Figure 4 It is Figure 2 an enlarged view of part A of

[0019] Figure 5 It is Figure 4 a schematic diagram of the completely closed state of the air intake of

[0020] Figure 6 It is Figure 4 a schematic diagram of the partially opened state of the air intake of

[0021] Figure 7 It is Figure 4 a schematic diagram of the completely opened state of the air intake of

[0022] Figure 8 It is Figure 2 an enlarged view of part B of

[0023] Figure 9 It is Figure 8 a schematic diagram of the opened state of the trigger of

[0024] Figure 10 It isFigure 2 Enlarged view at position C

[0025] Figure 11 is Figure 10 Schematic diagram of the open state of the opening and closing pin

[0026] Explanation of reference numerals:

[0027] 1. Body; 2. Trigger; 3. Safety pin; 4. Pressure spring; 5. Second connecting shaft; 6. First connecting shaft; 7. First sealing ring; 8. Second sealing ring; 9. Opening and closing pin; 10. Spring; 11. Opening and closing pin cover; 12. Piston sleeve; 13. Piston; 14. Cylinder; 15. Chuck seat split cap; 16. Chuck seat; 17. Fixed bolt; 18. Gasket; 19. Intake valve; 20. Shovel; 191. Knob; 192. Rotating shaft; 193. Intake hole; 194. Air flow channel Specific embodiments

[0028] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solutions of the present utility model, rather than being construed as a limitation to the technical solutions of the present utility model

[0029] As Figure 1 and Figure 2 shown, the present application provides a pneumatic shovel safety switch device, including a body 1, a cylinder 14 is provided at the front of the body, a piston 13 and a piston sleeve 12 are arranged in the cavity formed between the body 1 and the cylinder 14, an intake valve 19 is installed at the rear of the body 1, a trigger assembly is installed at the upper part of the body 1, and an opening and closing pin assembly is provided at the lower part of the body, and the trigger assembly abuts against the opening and closing pin assembly

[0030] Compressed air is introduced into the body through the intake valve. When the trigger assembly is pressed, it drives the movement of relevant mechanisms such as the opening and closing pin assembly. Compressed air passes through the intake valve and the body and flows into the cylinder assembly, pushing the piston and the piston sleeve to reciprocate in the cylinder, driving the chuck seat split cap at the front and the shovel fixed on the chuck seat to perform regular reciprocating movements. After releasing the trigger, the opening and closing pin assembly resets, the compressed air is cut off, the cylinder assembly stops moving, and the shovel also stops working

[0031] As Figures 3 to 7As shown, a knob 191 is provided on the intake valve 19. A rotary shaft 192 is connected below the knob 191 and extends into the air flow passage 194 of the intake valve. An intake hole 193 that penetrates radially is provided on the rotary shaft 192. The intake hole is used to adjust the opening degree of the air flow passage. When the knob above the rotary intake valve is rotated, the position of the radial intake hole on the rotary shaft below the knob changes relative to the axial hole of the air flow passage, and the size of the communicating part between the three holes inside and outside also changes, realizing stepless adjustment of the intake air flow rate. When the two holes are aligned, the angle is recorded as "0", and the intake air flow is the largest. When the knob is rotated, the staggered angle between the two holes changes. The larger the angle, the smaller the communicating part and the smaller the intake air flow. When the angle reaches 90°, the passage is completely closed.

[0032] As Figure 10 and Figure 11 shown, the opening and closing pin assembly includes an opening and closing pin 9, a spring 10, and an opening and closing pin cover 11. The opening and closing pin is arranged inside the body, and one end of the opening and closing pin passes through the body and abuts against the trigger assembly. The opening and closing pin cover is threadedly connected to the body, and the spring is arranged between the opening and closing pin cover and the lower end of the opening and closing pin.

[0033] A first sealing ring 7 and a second sealing ring 8 are sleeved at the place where the opening and closing pin passes through the body. The interface part and the adjusting mechanism of the pneumatic shovel safety switch device are made of brass, which is not only more corrosion-resistant than iron parts but also can effectively extend the service life. Two O-rings are designed at the place where the body contacts the opening and closing pin assembly to form a double-layer airtight structure in the front and back, ensuring that the high-pressure gas will not leak when the trigger is not operated, and completely eliminating the accidental danger caused by air leakage.

[0034] When the opening and closing pin assembly is in the closed state, the spring 10 pushes the opening and closing pin 9, making the second sealing ring 8 fit tightly with the body 1. When the trigger assembly moves downward, it presses the opening and closing pin 9 to move downward, the spring 10 is compressed, and the opening and closing pin 9 drives the second sealing ring 8 to move downward at the same time, opening the flow passage between the second sealing ring and the body, and the air flow enters the body 1 and the cylinder 14.

[0035] As Figure 8 and Figure 9As shown, the trigger assembly includes a trigger 2, a pressure spring 4, a safety pin 3, a first connecting shaft 6 and a second connecting shaft 5. The rear end of the trigger 2 is rotatably connected to the body 1 through the first connecting shaft 6. The second connecting shaft 5 sequentially passes through the pressure spring 4 and the safety pin 3 and then inserts into the trigger near the front end, and the other end of the pressure spring abuts against the body. The trigger includes a trigger body. A first convex portion extending downward is provided at the rear end of the trigger body. A first rotating shaft through hole is provided on the first convex portion. A second convex portion extending downward is provided near the front end of the trigger body. A second rotating shaft through hole is provided on the second convex portion. The safety pin includes a safety pin body. The safety pin body is bent. An upward arc-shaped convex portion is provided at the center rear of the safety pin body. A through hole is provided at a position corresponding to the arc-shaped convex portion on the safety pin body. Both ends of the safety pin body are arc-shaped.

[0036] As Figure 9 shown, the principle of the trigger switch mechanism is that only by first pushing the safety pin to move ① can the trigger be pressed down to move ②. When the pressure acting on the trigger is removed, the pressure spring pushes the safety pin to rotate and reset with the second connecting shaft as the central axis, and the safety pin drives the trigger and the whole mechanism to reset upward.

[0037] There is no redundant interference structure inside the air intake flow channel, and the gas pipeline is connected behind the intake valve. These optimized designs can output higher power under the same gas consumption conditions. Make the pneumatic shovel more safe, more durable, more energy-saving and environmentally friendly.

[0038] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Those of ordinary skill in the art in the essence of the present invention, any changes, alterations, additions or substitutions made should fall within the protection scope of the present invention.

Claims

1. A pneumatic scraper safety switch device, characterized in that: It includes a main body, a cylinder is arranged at the front of the main body, a piston and a piston sleeve are arranged in the cavity surrounded by the main body and the cylinder, an intake valve is installed at the rear of the main body, a trigger assembly is installed at the upper part of the main body, and an opening and closing pin assembly is arranged at the lower part of the main body, and the trigger assembly is against the opening and closing pin assembly.

2. The pneumatic scraper safety switch device according to claim 1, characterized in that: A knob is arranged on the air intake valve, a rotating shaft extending into the air flow passage of the air intake valve is connected below the knob, and a radially penetrating air intake hole is arranged on the rotating shaft, and the air intake hole is used to adjust the opening of the air flow passage.

3. The pneumatic scraper safety switch device according to claim 1, characterized in that: The opening and closing pin assembly includes an opening and closing pin, a spring and an opening and closing pin cover. The opening and closing pin is arranged in the body, and one end of the opening and closing pin passes through the body and abuts against the trigger assembly. The opening and closing pin cover is threadedly connected to the body, and the spring is arranged between the opening and closing pin cover and the lower end of the opening and closing pin.

4. The pneumatic scraper safety switch device according to claim 3, characterized in that: A first sealing ring and a second sealing ring are sleeved at the position where the opening and closing pin passes through the body.

5. The pneumatic scraper safety switch device according to claim 1, characterized in that: The trigger assembly includes a trigger, a pressure spring, a safety pin, a first connecting shaft and a second connecting shaft. The rear end of the trigger is rotatably connected to the body via the first connecting shaft. The second connecting shaft passes through the pressure spring and the safety pin in sequence and is inserted into the trigger near the front end. The other end of the pressure spring abuts against the body.

6. The pneumatic scraper safety switch device according to claim 5, characterized in that: The trigger includes a trigger body, a first protrusion extending downward is arranged at the rear end of the trigger body, a first shaft through hole is arranged on the first protrusion, a second protrusion extending downward is arranged near the front end of the trigger body, and a second shaft through hole is arranged on the second protrusion.

7. The pneumatic scraper safety switch device according to claim 5, characterized in that: The safety pin comprises a safety pin body which is curved, an upward arc-shaped protrusion is arranged at the rear of the center of the safety pin body, and a through hole is arranged at a position of the safety pin body corresponding to the arc-shaped protrusion.

8. The pneumatic scraper safety switch device according to claim 7, characterized in that: Both ends of the safety pin body are arc-shaped.

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