A small low-frequency vibration drilling device

Abstract

The present invention discloses a small-sized low-frequency vibration drilling device, which includes a machine body, a drilling module, and a vibration generating module. The machine body includes a base, a workbench lifting column, and a column. The workbench lifting column and the column are installed on the base front and back. The workbench is slidably connected to the column, and the lead screw is rotatably connected to the base through a bearing. The upper end of the column is fixedly installed with a top cover through screws, and the top cover is fixedly connected to the motor. The output shaft of the motor is fixedly connected to the lead screw. The drilling module includes a top motor and a gearbox, and the top motor is fixedly installed on the top of the gearbox. The vibration generating module includes a vibration generating module main shaft, and the vibration generating module main shaft is perpendicular to the drilling module main shaft. The vibration generating module includes an ordinary friction wheel and an eccentric friction wheel, and a spring is installed below the ordinary friction wheel. The vibration device has a simple and compact structure, miniaturizes the equipment, is convenient to carry, makes processing easier, and if vibration cutting is not required, the vibration generating module can be removed to achieve ordinary drilling.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration cutting, and particularly to a small-sized low-frequency vibration drilling device. Background Art

[0002] Due to its advantages such as light weight, high strength, and corrosion resistance, carbon fiber composite materials are widely used in the fields of aerospace, high-speed rail, etc. Usually, composite components are connected to other structural components by means of threads or riveting. Therefore, drilling has become an important process in the processing of composite materials. However, due to the special properties of composite materials, the drilling process becomes very difficult.

[0003] The ultrasonic vibration drilling device has a relatively lower axial force compared to ordinary drilling, and also has a certain reduction in the wear of the drill bit, and the surface machining quality is further improved. However, during the ultrasonic vibration drilling process, the chip breaking effect is not good, and the problem of excessive cutting temperature cannot be effectively solved. Low-frequency vibration drilling can effectively break chips and reduce the cutting temperature. Currently, most low-frequency vibration devices are realized by modifying the spindle part or the workbench of old machine tools. These devices are very bulky, not conducive to carrying, have many restrictions on the processing location, and cannot be fully utilized. Therefore, designing a small-sized low-frequency vibration drilling device is of great significance for effectively solving the hole processing problem of new materials. Summary of the Invention

[0004] A small-sized low-frequency vibration drilling device of the present invention includes a bed body, a drilling module, and a vibration generating module.

[0005] The bed body includes a base, a workbench lifting column, and a column. The workbench lifting column and the column are installed on the base front and back; the workbench is slidably connected to the column. The fixed end of the workbench lifting column is installed above the base and in front of the column. A workbench is fixedly arranged above the movable end of the workbench lifting column. A lead screw is rotatably installed in the middle of the column, and the lead screw is rotatably connected to the base through a bearing; the upper end of the column is fixedly installed with a top cover by screws, and the top cover is fixedly connected to a motor; the output shaft of the motor is fixedly connected to the lead screw.

[0006] The drilling module includes a top motor and a gearbox. The top motor is fixedly installed on the top of the gearbox. The top motor is connected to the speed-changing structure inside the gearbox and transmits power to the spindle fixedly connected to the output shaft of the gearbox through the gearbox; the gearbox is slidably connected to the column; a spindle housing is arranged outside the spindle, and the lower end of the spindle is detachably connected to a drill bit.

[0007] The starting oscillation module includes a main shaft of the starting oscillation module. The main shaft of the starting oscillation module is perpendicular to the main shaft of the drilling module, and the main shaft of the starting oscillation module and the main shaft of the drilling module are located in the same plane. The side of the lower housing is fixedly installed with the outer housing of the starting oscillation module mounted on the main shaft of the drilling module; the starting oscillation module includes an ordinary friction wheel and an eccentric friction wheel. The ordinary friction wheel is fixedly installed on the main shaft of the drilling module, while the eccentric friction wheel is installed on the main shaft of the starting oscillation module. The main shaft of the starting oscillation module is installed inside the outer housing of the starting oscillation module through bearings; a spring is installed below the ordinary friction wheel.

[0008] Preferably, the column stands upright on the base, and the column is fixedly connected to the base. The column is a cuboid as a whole, and a guide rail is fixedly arranged on the side of the column; one side of the workbench close to the column is slidably matched with the guide rail, and the column is a hollow structure.

[0009] Preferably, two sides of the column perpendicular to the plane where the guide rail is located are respectively provided with a lighting lamp and a coolant spray head. The lighting lamp and the coolant spray head are both connected to the column through universal ducts.

[0010] Preferably, a guide rail slider is fixedly installed on the side of the gearbox, and the guide rail slider is slidably connected to the guide rail;

[0011] The main shaft housing is divided into upper and lower parts, and the two parts are respectively an upper housing and a lower housing; the upper housing and the lower housing are connected by screws.

[0012] Preferably, the inner cavity of the upper housing is a cylinder. The cavity is divided into three major sections from bottom to top, and the diameter gradually increases. The diameter of the lowermost section is the largest; a through hole is opened in the vertical direction of the axis of the middle section cavity; the diameter of the uppermost section of the inner cavity is the smallest, and an annular protrusion is provided on the outer wall of the inner cavity, dividing the small-diameter cavity at the upper end into upper and lower sections; a thrust ball bearing is installed below the annular protrusion to bear the axial load; a needle roller bearing is installed above the annular protrusion;

[0013] The inner cavity of the lower housing is cylindrical, and an oil hole is opened obliquely upward on the right side of the lower housing; an opening is made on the side of the lower housing, and the axis of the hole is in the same plane as the axis of the main shaft of the drilling module and perpendicular to each other.

[0014] Preferably, the main shaft of the drilling module is divided into an upper main shaft and a lower main shaft; the upper main shaft is located above the lower main shaft, and the upper main shaft is rotationally connected to the gearbox; the lower main shaft is detachably connected to the tool; the upper main shaft and the lower main shaft are connected by a ball spline pair;

[0015] There are two shoulders on the upper main shaft. The shoulder at the upper end is sequentially matched with a face ball bearing and a needle roller bearing from bottom to top. The face ball bearing and the needle roller bearing are separated by an annular protrusion; a end cover is fixedly connected above the upper housing, and the upper end of the needle roller bearing abuts against the lower end face of the end cover of the upper housing;

[0016] An opening is made at the center position of the end cover for the upper main shaft to pass through. An annular groove with a trapezoidal cross-section is formed in the middle of the end cover, and a sealing rubber ring is installed inside the annular groove. The lower main shaft is connected to the lower housing through a ball spline. The lower end of the lower main shaft passes through the second end cover, and the second end cover is fixedly connected to the lower housing.

[0017] A through-hole is opened in the middle of the second end cover. An annular trapezoidal groove is formed in the middle of the second end cover, and a sealing rubber ring is installed inside the trapezoidal groove. The inner diameter of the sealing rubber ring contacts the lower main shaft. There is a sunken hole at the center of the upper surface of the second end cover, and the diameter of the sunken hole is larger than that of the through-hole. The sunken hole is used as a bearing seat.

[0018] Preferably, the diameter of the ordinary friction wheel is larger than that of the eccentric friction wheel.

[0019] The ordinary friction wheel and the eccentric friction wheel are in contact. The axes of the ordinary friction wheel and the eccentric friction wheel are perpendicular to each other. The side surface of the eccentric friction wheel contacts the end surface of the ordinary friction wheel.

[0020] Preferably, threads are provided at both ends of the main shaft of the vibration generating module. A round table is provided at one end of the main shaft of the vibration generating module, and there is an eccentricity between the axis of the round table and the main shaft of the vibration generating module. The eccentric friction wheel is installed at the right end of the main shaft of the vibration generating module. The eccentricity of the main shaft of the vibration generating module is equal to that of the eccentric friction wheel, and the two cooperate with each other to realize the adjustment of the amplitude. The main shaft of the vibration generating module is rotatably installed in the right end cover of the rotating sleeve. After the right end cover of the rotating sleeve is fixedly connected to the rotating sleeve and the left end cover of the rotating sleeve, it is slidably connected to the housing of the vibration generating module. The ordinary friction wheel is installed on the lower main shaft through a key and a pin. The main shaft of the vibration generating module is connected to the rotating sleeve through a pair of deep groove ball bearings, and the left side of the rotating sleeve is fixedly connected to the left end cover of the rotating sleeve.

[0021] Preferably, the long cylinder fixedly connected to the left end cover of the rotating sleeve extends out of the housing of the vibration generating module, and a sealing ring is installed between the left end cover of the rotating sleeve and the long cylinder. An adjustment handle is installed on the long cylinder, and the left end cover of the rotating sleeve is installed in the housing of the vibration generating module by a set screw.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Without using a motor as the vibration source, the vibration device has a simple and compact structure, the equipment is miniaturized, which is conducive to carrying, and the processing is easier. And if vibration cutting is not required, the vibration generating module can be removed to achieve ordinary drilling.

[0024] 2. The eccentric wheel mechanism is designed inside the device, which can not only increase the transmission efficiency, but also reduce the energy loss between the vibration generating device and the vibration of the tool, making the amplitude transmission effect better.

[0025] 3. The frequency of low-frequency vibration can be adjusted within a certain range by adjusting the distance between the two friction wheels, and the amplitude of the friction wheel can be changed by replacing the friction wheel.

[0026] A small low-frequency vibration drilling device of the present invention has an amplitude adjustment range of low-frequency vibration within 0-0.6 mm. Since the device is a double-eccentric design regarding the shaft and the eccentric wheel, each has an eccentricity of 0.3 mm for the shaft and the eccentric wheel design. Description of the Drawings

[0027] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0028] Figure 1 is the general assembly drawing of the low-frequency vibration drilling device of the present invention;

[0029] Figure 2 is the assembly drawing of the vibration generating module and the drilling module of the present invention;

[0030] Figure 3 is the structural schematic diagram of the lower main shaft of the present invention;

[0031] Figure 4 is the structural schematic diagram of the upper housing of the present invention;

[0032] Figure 5 is the structural schematic diagram of the lower housing of the present invention;

[0033] Figure 6 is the structural schematic diagram of the main shaft of the vibration generating module of the present invention;

[0034] Figure 7 is the structural schematic diagram of the ordinary friction wheel of the present invention;

[0035] Figure 8 is the structural schematic diagram of the second end cover of the present invention;

[0036] Figure 9 is the structural schematic diagram of the rotating sleeve of the present invention;

[0037] Figure 10 is the structural schematic diagram of the end cover of the present invention;

[0038] Figure 11 is of the present invention Figure 2 The enlarged structural schematic diagram at position a.

[0039] In the figure: base (1), workbench lifting column (2), column (3), guide rail (3-1), workbench (4), lighting lamp (5), coolant spray head (6), universal duct (7), lead screw (8), top cover (9), motor (10), top motor (11), gearbox (12), guide rail slider (13), upper housing (15), through hole (15-1), circular protrusion (15-2), lower housing (16), oil hole (16-1), hole (16-2), drill bit (17), vibration module main shaft (18), vibration module housing (19), ordinary friction wheel (20), end face (20-1), eccentric friction wheel (21), spring (22), needle roller bearing (23), upper main shaft (24), lower main shaft (25), shaft shoulder (25-1), ball spline pair (26), end cover (27), opening (27-1), annular groove (28-2), second end cover (29), through hole (30-1), trapezoidal groove (30-2), sunken hole (30-3), sealing rubber ring (30), rotating sleeve (31), right end cover of rotating sleeve (32), left end cover of rotating sleeve (33), long cylinder (34-1), set screw (35), adjusting handle (34-2). Detailed implementation manners

[0040] The following will disclose multiple implementation manners of the present invention with the aid of drawings. For the sake of clear description, many physical details will be described together in the following narration. However, it should be understood that these physical details are not used to limit the present invention. That is to say, in some implementation manners of the present invention, these physical details are unnecessary. In addition, for the sake of simplifying the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.

[0041] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0042] Please refer to Figures 1-10 , a small low-frequency vibration drilling device of the present invention, comprising a bed body, a drilling module, and a vibration module,

[0043] The bed body includes a base 1, a workbench lifting column 2, and a column 3. The workbench lifting column 2 and the column 3 are installed on the base 1 front and back. The workbench 4 is slidably connected to the column 3. Above the base 1 and in front of the column 3, the fixed end of the workbench lifting column 2 is installed. Above the movable end of the workbench lifting column 2, the workbench 4 is fixedly arranged. A lead screw 8 is rotatably installed in the middle of the column 3, and the lead screw 8 is rotatably connected to the base 1 through a bearing. The upper end of the column 3 is fixedly installed with a top cover 9 by screws, and the top cover 9 is fixedly connected to the motor 10. The output shaft of the motor 10 is fixedly connected to the lead screw 8.

[0044] The drilling module includes a top motor 11 and a gearbox 12. The top motor 11 is fixedly installed on the top of the gearbox 12. The top motor 11 is connected to the speed-changing structure inside the gearbox 12 and transmits power through the gearbox 12 to the main shaft fixedly connected to the output shaft of the gearbox 12. The gearbox 12 is slidably connected to the column 3. An outer main shaft housing is arranged outside the main shaft, and the lower end of the main shaft is detachably connected to the drill bit 17.

[0045] The vibration starting module includes a vibration starting module main shaft 18. The vibration starting module main shaft 18 is perpendicular to the drilling module main shaft, and the vibration starting module main shaft 18 and the drilling module main shaft are in the same plane. The vibration starting module housing 19 is fixedly installed on the side surface of the lower housing 16 and is installed on the drilling module main shaft. The vibration starting module includes a normal friction wheel 20 and an eccentric friction wheel 21. The normal friction wheel 20 is fixedly installed on the drilling module main shaft, while the eccentric friction wheel 21 is installed on the vibration starting module main shaft 18. The vibration starting module main shaft 18 is installed inside the vibration starting module housing 19 through a bearing. A spring 22 is installed below the normal friction wheel 20.

[0046] Further, the column 3 stands upright on the base 1, the column 3 is fixedly connected to the base 1. The column 3 is a cuboid as a whole, and a guide rail 3-1 is fixedly arranged on the side surface of the column 3. One side of the workbench 4 close to the column 3 is slidably matched with the guide rail 3-1. The column 3 is a hollow structure.

[0047] Further, on two side surfaces of the column 3 perpendicular to the plane where the guide rail 3-1 is located, a lighting lamp 5 and a coolant spray head 6 are respectively arranged. The lighting lamp 5 and the coolant spray head 6 are both connected to the column 3 through a universal conduit 7.

[0048] Further, a guide rail slider 13 is fixedly installed on the side surface of the gearbox 12, and the guide rail slider 13 is slidably connected to the guide rail 3-1.

[0049] The main shaft housing is divided into upper and lower parts, and the two parts are respectively an upper housing 15 and a lower housing 16. The upper housing 15 and the lower housing 16 are connected together by screws.

[0050] Further, the inner cavity of the upper housing 15 is cylindrical. The cavity is divided into three major sections from bottom to top with the diameter gradually increasing, and the diameter of the lowermost section is the largest. A through hole 15-1 is opened in the vertical direction of the axis of the middle section inner cavity. The diameter of the uppermost section of the inner cavity is the smallest, and an annular protrusion 15-2 is provided on the outer wall of the inner cavity, dividing the small-diameter cavity at the upper end into upper and lower sections. A thrust ball bearing is installed below the annular protrusion 15-2 to bear the axial load. A needle roller bearing 23 is installed above the annular protrusion 15-2.

[0051] The inner cavity of the lower housing 16 is cylindrical, and an oil hole 16-1 in an inclined direction is opened on the right side of the lower housing 16. An opening 16-2 is made on the side of the lower housing 16, and the axis of the hole 16-2 and the axis of the main shaft of the drilling module are in the same plane and perpendicular to each other.

[0052] Further, the main shaft of the drilling module is divided into an upper main shaft 24 and a lower main shaft 25. The upper main shaft 24 is located above the lower main shaft 25, and the upper main shaft 24 is rotationally connected to the transmission 12. The lower main shaft 25 is detachably connected to the tool. The upper main shaft 24 and the lower main shaft 25 are connected by a ball spline pair 26.

[0053] There are two shaft shoulders on the upper main shaft 24. The shaft shoulder 25-1 at the upper end is sequentially matched with a face ball bearing and a needle roller bearing from bottom to top. The face ball bearing and the needle roller bearing are separated by the annular protrusion 15-2. An end cover 27 is fixedly connected above the upper housing 15, and the upper end of the needle roller bearing abuts against the lower end face of the end cover 27 of the upper housing 15.

[0054] A hole 27-1 is opened at the center of the end cover 27 for the upper main shaft 24 to pass through. An annular groove 28-2 with a trapezoidal cross-section is opened in the middle of the end cover 27, and a sealing rubber ring 28 is installed inside the annular groove 28-2. The lower main shaft 25 is connected to the lower housing 16 by a ball spline. The lower end of the lower main shaft 25 passes through the second end cover 29, and the second end cover 29 is fixedly connected to the lower housing 16.

[0055] A through hole 30-1 is opened in the middle of the second end cover 29. An annular trapezoidal groove 30-2 is opened in the middle of the second end cover 29, and a sealing rubber ring 30 is installed inside the trapezoidal groove 30-2. The inner diameter of the sealing rubber ring 30 contacts the lower main shaft 25. There is a sunken hole 30-3 at the center of the upper surface of the second end cover 29, and the diameter of the sunken hole 30-3 is larger than that of the through hole 30-1. The sunken hole 30-3 is used as a bearing seat.

[0056] Further, the diameter of the ordinary friction wheel 20 is larger than that of the eccentric friction wheel 21.

[0057] The ordinary friction wheel 20 and the eccentric friction wheel 21 are in contact, the axes of the ordinary friction wheel 20 and the eccentric friction wheel 21 are perpendicular to each other, and the side surface of the eccentric friction wheel 21 contacts the end face 20-1 of the ordinary friction wheel 20.

[0058] Further, threads are provided at both ends of the main shaft 18 of the oscillation starting module. A frustum 18-2 is provided at one end of the main shaft 18 of the oscillation starting module. The axis of the frustum 18-2 has an eccentricity with the main shaft 18 of the oscillation starting module; an eccentric friction wheel 21 is installed at the right end of the main shaft 18 of the oscillation starting module; the eccentricity of the main shaft 18 of the oscillation starting module is equal to the eccentricity of the eccentric friction wheel 21, and each eccentricity is 0.3 mm. The two cooperate with each other to achieve the adjustment of the amplitude; the main shaft 18 of the oscillation starting module is rotatably installed in the right end cover 32 of the rotating sleeve. After the right end cover 32 of the rotating sleeve is fixedly connected to the rotating sleeve 31 and the left end cover 33 of the rotating sleeve, it is slidably connected to the outer shell 19 of the oscillation starting module. The ordinary friction wheel 20 is installed on the lower main shaft 25 through a key and a pin; the main shaft 18 of the oscillation starting module is connected to the rotating sleeve 31 through a pair of deep groove ball bearings, and the left end of the rotating sleeve 31 is fixedly connected to the left end cover 33 of the rotating sleeve.

[0059] Further, the long cylinder 34-1 fixedly connected to the left end cover 33 of the rotating sleeve extends out of the outer shell 19 of the oscillation starting module. A sealing ring is installed between the left end cover 33 of the rotating sleeve and the long cylinder 34-1; an adjusting handle 34-2 is installed on the long cylinder 34-1, and the left end cover 33 of the rotating sleeve is installed in the outer shell 19 of the oscillation starting module by relying on a set screw 35. When the vibration frequency needs to be adjusted, the set screw 35 is loosened, and the rotating sleeve 31 and the outer shell 19 of the oscillation starting module are no longer in close contact and can move relatively, so that the frequency or amplitude can be adjusted.

[0060] Embodiment: When in use, the workpiece to be processed is fixed on the workbench 4, and the drilling module and the oscillation starting module are installed on the guide rail 3-1 of the column, and the feed during the cutting process is realized through a ball screw. During the drilling process, no relative sliding occurs between the eccentric friction wheel 21 and the ordinary friction wheel 20 of the oscillation starting module. The eccentric friction wheel 21 is driven to rotate by the ordinary friction wheel 20. Due to the eccentricity of the eccentric friction wheel 2, a vertical vibration is generated on the friction wheel 20 to realize low-frequency vibration drilling. When adjustment is needed, the set screw 35 is loosened, and then the amplitude can be adjusted and the adjusting handle 34-2 can be pulled to change the relative position between the eccentric friction wheel 21 and the ordinary friction wheel 20. After the relative position between the eccentric friction wheel 21 and the ordinary friction wheel 20 is changed, the rotational speed of the eccentric friction wheel 21 will also change accordingly, and the change in the rotational speed also causes the vibration frequency generated by the eccentricity to change. If the amplitude needs to be changed, the set screw 35 on the outer shell 19 of the oscillation module is unscrewed, and the adjusting handle 34-2 is pulled to remove the main shaft 18 of the oscillation starting module together with the rotating sleeve 31. After removal, the double nuts at the right end are loosened, and the eccentric friction wheel 21 is rotated to cause a certain relative rotation between the main shaft 18 of the oscillation module and the eccentric friction wheel 21. Due to the eccentricity of the two, the change in the amplitude is completed under the overall action of the eccentric distances of the two. If the entire oscillation starting module is removed, ordinary drilling can be realized.

[0061] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A small low-frequency vibration drilling device, comprising a bed body, a drilling module, and a vibration generating module, characterized in that: The bed body includes a base (1), a workbench lifting column (2), and a column (3). The workbench lifting column (2) and the column (3) are installed front and back on the base (1); the workbench (4) is slidably connected to the column (3). The fixed end of the workbench lifting column (2) is installed above the base (1) and in front of the column (3). The workbench (4) is fixedly arranged above the moving end of the workbench lifting column (2). A lead screw (8) is rotatably installed in the middle of the column (3), and the lead screw (8) is rotatably connected to the base (1) through a bearing; the upper end of the column (3) is fixedly installed with a top cover (9) through screws, and the top cover (9) is fixedly connected to the motor (10); the output shaft of the motor (10) is fixedly connected to the lead screw (8); The drilling module includes a top motor (11) and a gearbox (12). The top motor (11) is fixedly installed on the top of the gearbox (12). The top motor (11) is connected to the speed-changing structure inside the gearbox (12) and transmits power through the gearbox (12) to the main shaft fixedly connected to the output shaft of the gearbox (12); the gearbox (12) is slidably connected to the column (3); a main shaft housing is arranged outside the main shaft, and the lower end of the main shaft is detachably connected to the drill bit (17); The vibration generating module includes a vibration generating module main shaft (18). The vibration generating module main shaft (18) is perpendicular to the main shaft of the drilling module, and the vibration generating module main shaft (18) and the main shaft of the drilling module are in the same plane. The vibration generating module housing (19) is fixedly installed on the side of the lower housing (16) of the main shaft housing; the vibration generating module includes a normal friction wheel (20) and an eccentric friction wheel (21). The normal friction wheel (20) is fixedly installed on the main shaft of the drilling module, while the eccentric friction wheel (21) is installed on the vibration generating module main shaft (18). The vibration generating module main shaft (18) is installed inside the vibration generating module housing (19) through a bearing; a spring (22) is installed below the normal friction wheel (20); the side surface of the eccentric friction wheel (21) is in contact with the end surface (20-1) of the normal friction wheel (20), and the eccentric friction wheel (21) is driven to rotate by the normal friction wheel (20).

2. The small low-frequency vibration drilling device according to claim 1, characterized in that The column (3) stands upright on the base (1), and the column (3) is fixedly connected to the base (1). The column (3) is a cuboid as a whole, and a guide rail (3-1) is fixedly arranged on the side surface of the column (3); one side of the workbench (4) close to the column (3) is slidably matched with the guide rail (3-1), and the column (3) is a hollow structure.

3. A small low-frequency vibration drilling device according to claim 2, characterized in that, Two side surfaces of the column (3) perpendicular to the plane where the guide rail (3-1) is located are respectively provided with a lighting lamp (5) and a coolant spray head (6). The lighting lamp (5) and the coolant spray head (6) are both connected to the column (3) through a universal conduit (7).

4. The small low-frequency vibration drilling device according to claim 2, characterized in that, A guide rail slider (13) is fixedly installed on the side surface of the gearbox (12), and the guide rail slider (13) is slidably connected to the guide rail (3-1); The main shaft housing is divided into upper and lower parts, which are respectively an upper housing (15) and a lower housing (16); the upper housing (15) and the lower housing (16) are connected together by screws.

5. The small low-frequency vibration drilling device according to claim 4, characterized in that, The inner cavity of the upper housing (15) is cylindrical. The cavity is divided into three major sections from bottom to top, with the diameter gradually increasing and the diameter of the lowermost section being the largest. A through hole (15-1) is opened in the vertical direction of the axis of the middle section inner cavity. The diameter of the uppermost section of the inner cavity is the smallest, and an annular protrusion (15-2) is provided on the outer wall of the inner cavity, dividing the small-diameter cavity at the upper end into upper and lower sections. A thrust ball bearing is installed below the annular protrusion (15-2) to bear the axial load. A needle roller bearing (23) is installed above the annular protrusion (15-2). The inner cavity of the lower housing (16) is cylindrical. An oil hole (16-1) in an oblique direction is opened on the right side of the lower housing (16). An opening (16-2) is made on the side of the lower housing (16), and the axis of the hole (16-2) and the axis of the main shaft of the drilling module are in the same plane and perpendicular to each other.

6. The small low-frequency vibration drilling device according to claim 5, characterized in that, The main shaft of the drilling module is divided into an upper main shaft (24) and a lower main shaft (25). The upper main shaft (24) is located above the lower main shaft (25), and the upper main shaft (24) is rotationally connected to the gearbox (12). The lower main shaft (25) is detachably connected to the tool. The upper main shaft (24) and the lower main shaft (25) are connected by a ball spline pair (26). There are two shoulders on the upper main shaft (24). The shoulder (25-1) at the upper end is sequentially matched with a thrust ball bearing and a needle roller bearing from bottom to top. The thrust ball bearing and the needle roller bearing are separated by the annular protrusion (15-2). A end cover (27) is fixedly connected above the upper housing (15), and the upper end of the needle roller bearing abuts against the lower end face of the end cover (27) of the upper housing (15). A hole (27-1) is opened at the center of the end cover (27) for the upper main shaft (24) to pass through. A trapezoidal annular groove (28-2) is opened in the middle of the end cover (27), and a sealing rubber ring (28) is installed inside the annular groove (28-2). The lower main shaft (25) is connected to the lower housing (16) by a ball spline. The lower end of the lower main shaft (25) passes through the second end cover (29), and the second end cover (29) is fixedly connected to the lower housing (16). A through hole (30-1) is opened in the middle of the second end cover (29). An annular trapezoidal groove (30-2) is opened in the middle of the second end cover (29), and a sealing rubber ring (30) is installed inside the trapezoidal groove (30-2). The inner diameter of the sealing rubber ring (30) contacts the lower main shaft (25). There is a sunken hole (30-3) at the center of the upper surface of the second end cover (29), and the diameter of the sunken hole (30-3) is larger than that of the through hole (30-1). The sunken hole (30-3) is used as a bearing seat.

7. A small low-frequency vibration drilling device according to claim 1, characterized in that, The diameter of the ordinary friction wheel (20) is larger than that of the eccentric friction wheel (21). The ordinary friction wheel (20) and the eccentric friction wheel (21) are in contact, and the axes of the ordinary friction wheel (20) and the eccentric friction wheel (21) are perpendicular to each other.

8. The small low-frequency vibration drilling device according to claim 6, characterized in that, Both ends of the main shaft (18) of the oscillation starting module are provided with threads. One end of the main shaft (18) of the oscillation starting module is provided with a frustum (18-2), and there is an eccentricity between the axis of the frustum (18-2) and the main shaft (18) of the oscillation starting module; the eccentric friction wheel (21) is installed at the right end of the main shaft (18) of the oscillation starting module; the eccentricity of the main shaft (18) of the oscillation starting module is equal to the eccentricity of the eccentric friction wheel (21), and the two cooperate with each other to realize the adjustment of the amplitude; the main shaft (18) of the oscillation starting module is rotatably installed in the right end cover (32) of the rotating sleeve. After the right end cover (32) of the rotating sleeve is fixedly connected to the rotating sleeve (31) and the left end cover (33) of the rotating sleeve, it is slidably connected to the outer shell (19) of the oscillation starting module. The ordinary friction wheel (20) is installed on the lower main shaft (25) through a key and a pin; the main shaft (18) of the oscillation starting module is connected to the rotating sleeve (31) through a pair of deep groove ball bearings, and the left side of the rotating sleeve (31) is fixedly connected to the left end cover (33) of the rotating sleeve.

9. The small low-frequency vibration drilling device according to claim 8, wherein, The long cylinder (34-1) fixedly connected to the left end cover (33) of the rotating sleeve extends out of the outer shell (19) of the oscillation starting module; an adjustment handle (34-2) is installed on the long cylinder (34-1), and the rotating sleeve (31) is installed in the outer shell (19) of the oscillation starting module by a set screw (35).

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