Friction-resistant electric hammer piston

Abstract

The utility model relates to a friction-resistant electric hammer piston, which belongs to the technical field of electric hammers and comprises a piston column and a connecting rod, an oil storage chamber is arranged inside the piston column, an oil filling port is arranged at the bottom of the piston column, and a lubricating mechanism is arranged on the side wall of the piston column. The lubricating mechanism is used for lubricating the friction portion of the piston column and the air cylinder sleeve, and an oil injection assembly is installed in the lubricating mechanism. Through cooperative use of the lubricating mechanism and the oil injection assembly, when the piston column moves up and down in the cylinder sleeve in a reciprocating mode, the rolling ball can make contact with the inner surface of the cylinder sleeve and roll in the moving process of the piston column, then the oil injection assembly works, and the oil discharging groove injects lubricating oil into the contact portion of the piston column and the cylinder sleeve; therefore, the friction portion of the piston column and the air cylinder sleeve is lubricated, jamming between the piston column and the air cylinder sleeve is avoided, the working efficiency of the electric hammer is guaranteed, and the service life of the piston column and the service life of the air cylinder sleeve are prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric hammers, and in particular relates to a friction-resistant electric hammer piston. Background Art

[0002] The electric hammer is a widely used power tool. It is based on the electric drill, but adds a piston with a crankshaft connecting rod driven by an electric motor. The compressed air is reciprocated in a cylinder, causing the air pressure in the cylinder to change periodically. The changing air pressure drives the hammer in the cylinder to reciprocate and strike the top of the drill bit, which is equivalent to hitting the drill bit with a hammer; hence the name electric hammer. The electric hammer consists of an electric motor, a gear reducer, a crank-connecting rod impact mechanism, a drill rotation mechanism, an overload protection device, a power switch and a power connection device. The rotational motion of the motor is driven by the meshing gears of the rotating shaft gear, respectively, to the eccentric connecting rod impact mechanism and the drill rotation mechanism of the spur bevel gear pair to obtain the required impact power and torque. The impact motion is driven by the rotation of the motor through the gear to drive the eccentric connecting rod mechanism, causing the compressor piston to reciprocate in the cylinder sleeve, and at the same time, an air cushion is generated between the compressor piston and the impact piston. Because the impact piston reciprocates synchronously with the compressor piston, it hammers the tail of the drill pipe, thereby causing the construction worker to drill a hole. Due to the formation of the air cushion, it also plays a buffering role when the whole machine is subjected to force rebound.

[0003] At present, the electric hammer is an electric motor that rotates and drives an eccentric connecting rod mechanism through gears, so that the compressed air piston reciprocates in the cylinder liner. Long-term friction will cause wear on the outer wall of the piston and the inner wall of the cylinder liner. If the friction parts of the piston and the cylinder liner are not lubricated, it will cause jamming between the piston and the cylinder liner, affecting the working efficiency of the electric hammer. In addition, it will also shorten the service life of the piston and the cylinder liner. Based on this, a friction-resistant electric hammer piston is proposed. Utility Model Content

[0004] The purpose of the present invention is to provide a friction-resistant electric hammer piston with a simple structure and reasonable design in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A friction-resistant electric hammer piston includes a piston column and a connecting rod. An oil storage chamber is provided inside the piston column, and a refueling port is provided at the bottom of the piston column. The oil storage chamber is communicated with the inside of the refueling port. A sealing plug is connected to the inside of the refueling port via a threaded connection. A lubrication mechanism is provided on the side wall of the piston column. The lubrication mechanism is used to lubricate the friction parts of the piston column and the cylinder liner, and an oil injection assembly is installed in the lubrication mechanism.

[0007] As a further optimization scheme of the present invention, the lubrication mechanism includes a connecting groove opened on the side wall of the piston column, the side wall of the piston column is provided with an oil drain groove, a rolling ball is rotatably connected in the oil drain groove, the connecting groove is connected to the inside of the oil drain groove, and the connecting groove is connected to the inside of the oil storage chamber.

[0008] As a further optimization scheme of the present invention, the oil filling assembly includes a fixed plate fixedly connected to the oil inlet end of the communicating groove, a reset spring is fixedly connected to one side of the fixed plate located inside the communicating groove, a magnetic column is fixedly connected to the end of the reset spring away from the fixed plate, an oil inlet is provided in the middle position of the fixed plate, the magnetic column is configured to be hollow, and a magnetic sheet is fixedly connected to the outer wall of the rolling ball, and the magnetic properties of the magnetic sheet and the magnetic column are the same.

[0009] As a further optimized solution of the present invention, the oil storage chamber and the communicating groove are connected through an oil inlet.

[0010] As a further optimization solution of the present invention, the outer surface of the magnetic column is sealed and slidably connected to the inner surface of the connecting groove.

[0011] As a further optimization solution of the present invention, one end of the connecting rod is rotatably connected to the piston column, and the outer surface of the piston column is fixedly connected with a first sealing ring and a second sealing ring in sequence from top to bottom, and the oil injection assembly is arranged between the first sealing ring and the second sealing ring.

[0012] The beneficial effect of the present invention is that: through the coordinated use of the lubricating mechanism and the oil injection assembly, when the piston rod moves back and forth up and down in the cylinder sleeve, the rolling ball will contact the inner surface of the cylinder sleeve and roll during the movement of the piston rod, thereby making the oil injection assembly work, so that the oil drain groove injects lubricating oil into the contact part of the piston rod and the cylinder sleeve, thereby lubricating the friction part between the piston rod and the cylinder sleeve, avoiding the situation that the piston rod and the cylinder sleeve are stuck, ensuring the working efficiency of the electric hammer, and extending the service life of the piston rod and the cylinder sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the bottom cutaway structure of the present utility model;

[0015] Figure 3 This utility model Figure 2 A in the middle is an enlarged structural diagram;

[0016] Figure 4 It is a schematic diagram of the three-dimensional middle section structure of the utility model;

[0017] Figure 5 This utility model Figure 4 Enlarged structural diagram at point B in the middle.

[0018] In the figure: 1. Piston column; 2. Connecting rod; 3. First sealing ring; 4. Second sealing ring; 5. Oil storage chamber; 6. Oil filling port; 7. Sealing plug; 8. Connecting groove; 9. Oil drain groove; 10. Fixed plate; 11. Oil inlet; 12. Magnetic column; 13. Return spring; 14. Rolling ball; 15. Magnetic plate. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example

[0021] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a friction-resistant electric hammer piston includes a piston column 1 and a connecting rod 2, one end of the connecting rod 2 is rotatably connected to the piston column 1, the outer surface of the piston column 1 is fixedly connected with a first sealing ring 3 and a second sealing ring 4 from top to bottom, and an oil filling assembly is arranged between the first sealing ring 3 and the second sealing ring 4, an oil storage chamber 5 is provided inside the piston column 1, a refueling port 6 is provided at the bottom of the piston column 1, the oil storage chamber 5 is communicated with the interior of the refueling port 6, a sealing plug 7 is connected to the interior of the refueling port 6 through a threaded connection, a lubrication mechanism is provided on the side wall of the piston column 1, the lubrication mechanism is used to lubricate the friction parts of the piston column 1 and the cylinder liner, and an oil filling assembly is installed in the lubrication mechanism.

[0022] When in use, first open the sealing plug 7 and add a sufficient amount of lubricating oil into the oil storage chamber 5 through the oil filling port 6. Then install the piston rod 1 in the electric hammer through the connecting rod 2, and make the piston rod 1 located in the cylinder sleeve. When the electric hammer is working, the piston rod 1 moves back and forth in the cylinder sleeve and hits the top of the drill bit. During this process, the lubrication mechanism and the oil injection assembly will work in the process of the piston rod 1 reciprocating in the cylinder sleeve, injecting lubricating oil into the friction part between the piston rod 1 and the cylinder sleeve.

[0023] The friction parts of the piston rod 1 and the cylinder sleeve are lubricated to avoid the jamming between the piston rod 1 and the cylinder sleeve, thereby ensuring the working efficiency of the electric hammer and extending the service life of the piston rod 1 and the cylinder sleeve.

[0024] like Figure 2 、 Figure 3 、 Figure 4and Figure 5 As shown, the lubrication mechanism includes a connecting groove 8 provided on the side wall of the piston column 1, an oil drain groove 9 provided on the side wall of the piston column 1, a rolling ball 14 rotatably connected in the oil drain groove 9, and the rolling ball 14 is not a full-size sphere. The two sides of the portion where the rolling ball 14 is rotatably connected to the oil drain groove 9 are set to be flat. In the process of the piston column 1 reciprocating along the inner surface of the cylinder liner, the rolling ball 14 always fits with the cylinder liner, the connecting groove 8 is connected to the inside of the oil drain groove 9, and the connecting groove 8 is connected to the inside of the oil storage chamber 5. The oil injection assembly includes a fixed plate 10 fixedly connected to the oil inlet end of the connecting groove 8, and a return spring 13 is fixedly connected to one side of the fixing plate 10 located inside the connecting groove 8. The end of the return spring 13 away from the fixed plate 10 is fixedly connected to the magnetic column 12. An oil inlet 11 is opened in the middle position of the fixed plate 10, and a one-way valve is installed in the oil inlet 11, so that the lubricating oil in the oil storage chamber 5 can only enter the connecting groove 8 through the oil inlet 11. The magnetic column 12 is set to be hollow, and a one-way valve is installed in the hollow part of the magnetic column 12, so that the lubricating oil in the connecting groove 8 can only be discharged through the magnetic column 12. The outer wall of the rolling ball 14 is fixedly connected to a magnetic piece 15, and the magnetic property of the magnetic piece 15 is the same as that of the magnetic column 12. The oil storage chamber 5 and the connecting groove 8 are connected through the oil inlet 11, and the outer surface of the magnetic column 12 is sealed and slidably connected to the inner surface of the connecting groove 8.

[0025] During use, when the piston column 1 reciprocates in the cylinder sleeve, the rolling ball 14 fits against the cylinder sleeve, causing the rolling ball 14 to roll during the reciprocating movement of the piston column 1, thereby causing the magnetic piece 15 to intermittently align with the magnetic column 12. When the magnetic piece 15 aligns with the magnetic column 12, the magnetic column 12 moves toward the direction of the fixed plate 10 under the action of the magnetic repulsive force, squeezing the return spring 13 so that the lubricating oil in the connecting groove 8 is discharged into the oil drain groove 9 through the magnetic column 12, and is discharged to the outer surface of the piston column 1 and the inner surface of the cylinder sleeve through the outer surface and both sides of the rolling ball 14, thereby achieving effective lubrication of the part where the rolling ball 14 is rotatably connected to the oil drain groove 9, and maintaining the stability of the piston column 1 and the cylinder sleeve. The friction contact parts are lubricated, and when the magnetic piece 15 moves from the position aligned with the magnetic column 12 to the position separated from the magnetic column 12, the magnetic column 12 will move toward the direction of the oil drain groove 9 under the action of the reset spring 13, so that the connecting groove 8 draws the lubricating oil in the oil storage chamber 5 through the oil inlet 11, and so on, thereby achieving good lubrication of the friction contact parts between the piston column 1 and the cylinder sleeve, and the rolling ball 14 provides a good guide for the movement of the piston column 1 in the cylinder sleeve, reducing the probability of the piston column 1 being offset when moving in the cylinder sleeve, further reducing the wear between the piston column 1 and the cylinder sleeve, extending the service life of the piston column 1 and the cylinder sleeve, and improving the stability of the electric hammer during operation.

[0026] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A friction-resistant electric hammer piston, comprising a piston column (1) and a connecting rod (2), characterized in that: An oil storage chamber (5) is provided inside the piston column (1), and a refueling port (6) is provided at the bottom of the piston column (1). The oil storage chamber (5) is communicated with the inside of the refueling port (6), and a sealing plug (7) is connected to the inside of the refueling port (6) through a threaded connection. A lubricating mechanism is provided on the side wall of the piston column (1), and the lubricating mechanism is used to lubricate the friction parts between the piston column (1) and the cylinder sleeve. An oil injection assembly is installed in the lubricating mechanism.

2. The friction-resistant electric hammer piston according to claim 1, characterized in that: The lubricating mechanism comprises a connecting groove (8) provided on the side wall of the piston column (1), an oil drain groove (9) provided on the side wall of the piston column (1), a rolling ball (14) rotatably connected in the oil drain groove (9), the connecting groove (8) being connected to the inside of the oil drain groove (9), and the connecting groove (8) being connected to the inside of the oil storage chamber (5).

3. The friction-resistant electric hammer piston according to claim 2, characterized in that: The oil injection assembly comprises a fixed plate (10) fixedly connected to the oil inlet end of the connecting groove (8); a reset spring (13) is fixedly connected to one side of the fixed plate (10) located inside the connecting groove (8); a magnetic column (12) is fixedly connected to one end of the reset spring (13) away from the fixed plate (10); an oil inlet (11) is provided in the middle of the fixed plate (10); the magnetic column (12) is hollow; a magnetic sheet (15) is fixedly connected to the outer wall of the rolling ball (14); and the magnetic properties of the magnetic sheet (15) and the magnetic column (12) are the same.

4. The friction-resistant electric hammer piston according to claim 3, characterized in that: The oil storage chamber (5) and the communication groove (8) are connected through the oil inlet (11).

5. The friction-resistant electric hammer piston according to claim 3, characterized in that: The outer surface of the magnetic column (12) is sealed and slidably connected to the inner surface of the connecting groove (8).

6. The friction-resistant electric hammer piston according to claim 1, characterized in that: One end of the connecting rod (2) is rotatably connected to the piston column (1); the outer surface of the piston column (1) is fixedly connected with a first sealing ring (3) and a second sealing ring (4) in sequence from top to bottom; and the oil injection assembly is arranged between the first sealing ring (3) and the second sealing ring (4).

Images