Pneumatic impact system of electric hammer

Abstract

The utility model provides an electric hammer pneumatic impact system which comprises an air cylinder, a rammer and a piston, the rammer and the piston are installed in the air cylinder, a closed space is formed between the piston and the rammer, an air supplementing hole is formed in the end face of the piston, and the air cylinder is not provided with the air supplementing hole. The ram is simple in structure, a sealing ring on the ram is not prone to abrasion, maintenance cost can be reduced, the speed and energy of the ram can be adjusted by adjusting the opening pressure of an air supplementing hole valve and changing the volume of an air cushion, the rear end of the piston is communicated with a lubricating oil bin, and lubricating oil can be sucked between the piston and the ram through an air supplementing hole in the piston. The problem that the rammer is not easy to lubricate is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric hammer pneumatic impact system. Background Art

[0002] The pneumatic impact system of the electric hammer is composed of a cylinder, a hammer and a piston. The hammer and the piston are installed in the cylinder. A closed space is formed between the piston and the hammer. The gas in the closed space is an air cushion. The piston reciprocates under the drive of the crank slider mechanism, causing the air cushion to produce pressure changes. The hammer reciprocates with the movement of the piston under the action of the air cushion pressure and the external atmospheric pressure, continuously hitting the secondary hammer, and then transferring energy to the drill bit.

[0003] In actual operation, due to the leakage of gas in the cylinder air chamber, it is necessary to open a gas filling hole to maintain the mass balance of the air cushion and ensure the normal operation of the pneumatic impact system. At present, the gas filling holes of most electric hammers are opened on the cylinder wall. Due to the small diameter of the gas filling hole, the processing cost is high, and pits will be formed on the cylinder wall. When the hammer reciprocates back and forth in the gas filling hole, the sealing ring on the hammer is easy to wear. In order to solve the above problems, some technical solutions adopt the method of opening a ventilation groove on the side of the hammer, such as China Utility Model Patent: A Pneumatic Hammer for Electric Hammer Cylinder (Announcement No.: CN 218592912 U, Publication Date: 2023.03.10), China Utility Model Patent: An Impact Hammer, Electric Hammer Cylinder and Light Electric Hammer for Electric Hammer Cylinder (Announcement No.: CN 208483797 U, Publication Date: 2019.02.12). However, due to the high hardness of the hammer, the cost of processing the ventilation groove is high. Moreover, since the edge of the vent groove destroys the continuity of the circumferential side, the ram is easy to scratch the inner wall of the cylinder. Since the lubricating oil cannot be added from the front of the ram, it is also impossible to hope that the vent groove can transport the lubricating oil to the rear of the ram. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides an electric hammer pneumatic impact system with simple structure and good use effect.

[0005] The technical solution of the utility model is: an electric hammer pneumatic impact system, comprising a cylinder, a hammer and a piston, the hammer and the piston are installed in the cylinder, a closed space is formed between the piston and the hammer, an air filling hole is arranged on the end surface of the piston, and no air filling hole is arranged on the cylinder.

[0006] Furthermore, in the above-mentioned electric hammer pneumatic impact system, the air supply hole on the piston end face is equipped with a pressure-adjustable one-way valve, which can adjust the valve opening pressure.

[0007] Furthermore, in the above-mentioned electric hammer pneumatic impact system, the air supply hole on the piston end face is equipped with a regulating valve, and the ventilation volume is adjustable.

[0008] The beneficial effects of the utility model are: no air filling hole is provided on the cylinder, the sealing ring on the ram is not easy to wear, and the maintenance cost can be reduced; since the piston and the ram are not in contact, the piston is not impacted by external force, and is usually made of aluminum alloy, the processing cost of opening the air filling hole is low; the air filling hole can be equipped with a pressure-adjustable one-way valve, and the volume of the air cushion can be changed by adjusting the valve opening pressure, thereby adjusting the speed and energy of the ram; the air filling hole can also be equipped with a regulating valve, the ventilation volume can be adjusted, thereby changing the volume of the air cushion and adjusting the speed and energy of the ram; the rear end of the piston is connected to the lubricating oil tank, and the lubricating oil can be sucked into the space between the piston and the ram through the air filling hole on the piston, thereby solving the problem of the ram being difficult to lubricate. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0010] Attached Figure 1 It is a three-dimensional structural diagram of the utility model.

[0011] Attached Figure 2 It is a cross-sectional view of the piston of the first embodiment of the utility model.

[0012] Attached Figure 3 It is a piston assembly diagram of the second embodiment of the utility model.

[0013] Attached Figure 4 It is a cross-sectional view of a piston according to a second embodiment of the utility model.

[0014] Attached Figure 5 It is a cross-sectional view of a piston according to a third embodiment of the present utility model.

[0015] Explanation of the accompanying reference numerals: 1. vent hole; 2. idle stroke hole; 3. cylinder; 4. rocker; 5. piston; 6. hammer; 7. air supply hole; 8. piston; 9. sealing ring; 10. baffle with hole; 11. spring; 12. sealing ball; 13. sealing ring; 14. piston; 15. fixing pin; 16. rocker; 17. needle valve; 18. piston; 19. vent hole. DETAILED DESCRIPTION

[0016] like Figure 1 , Figure 2 As shown, the first embodiment of the utility model is an electric hammer pneumatic impact system, which includes a cylinder, a hammer and a piston. The hammer and the piston are installed in the cylinder, and a closed volume is formed between the piston and the hammer. An air supply hole 7 is provided on the end face of the piston 8, and no air supply hole is provided on the cylinder.

[0017] like Figure 1 , Figure 3As shown, the second embodiment of the utility model is an electric hammer pneumatic impact system, which includes a cylinder, a hammer and a piston. The hammer and the piston are installed in the cylinder. A closed volume is formed between the piston and the hammer. An air supply hole is provided on the end face of the piston, and no air supply hole is provided on the cylinder. A pressure-adjustable one-way valve is installed in the air supply hole. The pressure-adjustable one-way valve uses a sealing ball 12 as a valve core. The valve opening pressure is controlled by adjusting the perforated baffle 10 to change the tightness of the spring 11 in contact with the sealing ball, thereby realizing the adjustment of the air cushion volume, and then adjusting the hammer speed and energy.

[0018] like Figure 1 , Figure 5 As shown, the third embodiment of the utility model is an electric hammer pneumatic impact system, which includes a cylinder, a hammer and a piston. The hammer and the piston are installed in the cylinder. A closed volume is formed between the piston and the hammer. An air supply hole is provided on the end face of the piston, and no air supply hole is provided on the cylinder. A needle valve 17 is installed in the air supply hole to adjust the air flow.

[0019] The specific implementation methods described above provide a detailed description of the technical solutions and beneficial effects of the utility model. It should be understood that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An electric hammer pneumatic impact system, characterized in that: The utility model comprises a cylinder, a hammer and a piston. The hammer and the piston are installed in the cylinder. A closed space is formed between the piston and the hammer. An air supply hole is arranged on the end surface of the piston, but no air supply hole is arranged on the cylinder.

2. The electric hammer pneumatic impact system according to claim 1 is characterized in that A one-way valve is installed in the air supply hole.

3. The electric hammer pneumatic impact system according to claim 1 is characterized in that A regulating valve is installed in the air supply hole, and the air flow rate is adjustable.

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