Self-chip-removal small-diameter deep hole drilling machine

Abstract

The invention discloses a self-chip-removal small-diameter deep hole drilling machine which comprises a machine base, a stand column, a spindle box, a feeding mechanism, a guide rail assembly and a drill bit assembly. The front part of the engine base body is of a structure with a fully-open upper surface; the central flange seat is supported by four triangular rib plates in the engine base body and is suspended; the drill bushing flange is connected with the central flange seat, the quick-change drill chuck is connected with the drill bushing flange and is perpendicular to the base body, the drill bit is mounted on the quick-change drill chuck, and a drill tip of the drill bit faces upwards; the stand column is fixed on the rear portion of the machine base body, the spindle box is located above the front portion of the machine base body, the feeding mechanism is connected with the spindle box, and the spindle box moves up and down along the stand column through the guide rail assembly. The workpiece and the drill bit are arranged in an inverted mode, the drill point of the drill bit is upward and does not move, the workpiece rotates and moves downwards at the same time, composite motion of drilling and feeding is formed, and cuttings generated in the drilling process fall into an inner cavity of the machine base downwards under the dual action of blade extrusion and gravity.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting, and more particularly to a self-chip removal small-diameter deep hole drilling machine. Background Art

[0002] Deep hole processing in traditional metal cutting is quite difficult. Ordinary processing methods, whether vertical or horizontal, require frequent withdrawal of the drill bit to remove the chips inside to prevent blockage. There are several types of special equipment for large diameter deep hole processing on the market. The key technology is to use a hollow drill rod and inject pressurized liquid to help remove chips. This type of equipment must be equipped with a hydraulic system. However, the processing of small diameter deep holes (aspect ratio>10, diameter<10) has become a difficulty in metal cutting because it is impossible to use hollow drill bits and drill rods. Although some processing methods have appeared for a long time, they are only temporary solutions and cannot effectively solve the problem of drilling small diameter deep holes. Therefore, the field of metal cutting needs to overcome this problem. Mechanical processing equipment appears. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a self-chip removal small-diameter deep hole drilling machine, which arranges the workpiece and the drill bit inverted, with the drill tip facing upward and stationary, and the workpiece rotating and moving downward at the same time, forming a composite motion of drilling and feeding, so that the chips generated during drilling fall downward into the inner cavity of the machine base with the help of the dual effects of blade extrusion and gravity, thereby solving the technical problem of difficult chip removal in small-diameter deep hole processing in the existing metal cutting processing field.

[0004] The present invention discloses a self-chip removal small-diameter deep hole drilling machine, which comprises a machine base, a column, a spindle box, a feeding mechanism, a guide rail assembly and a drill bit assembly; the machine base comprises a machine base base body, a center flange seat and a rib plate, and the drill bit assembly comprises a drill sleeve flange, a quick-change drill chuck and a drill bit; the front part of the machine base base body is a fully open structure on the top, and the center flange seat is supported by four triangular rib plates inside the machine base base body in a suspended state; the drill sleeve flange is connected to the center flange seat, the quick-change drill chuck is connected to the drill sleeve flange and is perpendicular to the machine base body, and the drill bit is mounted on the quick-change drill chuck with the drill tip facing upward; the column is fixed on the upper part of the rear part of the machine base body, the spindle box is located above the front part of the machine base body, the feeding mechanism is connected to the spindle box, and the spindle box moves up and down along the column through the guide rail assembly.

[0005] Furthermore, the spindle box includes a box body, a main shaft, a lower bearing, a large pulley, an upper flange, a needle roller bearing without an inner ring, a multi-V belt, a small pulley, and a motor; the main shaft and the motor are vertically installed in the box body in parallel; the large pulley is connected to the main shaft, and the small pulley is connected to the output shaft of the motor, the large pulley and the small pulley are at the same height and the two are connected by a multi-V belt; the upper flange cooperates with the hole on the upper side of the box body and is connected to the top surface of the box body, and the needle roller bearing without an inner ring is arranged in the hole of the upper flange; the lower bearing is arranged in the hole below the box body; the upper and lower ends of the main shaft are respectively connected to the needle roller bearing without an inner ring and the lower bearing; the feeding mechanism includes a motor, a flange, a coupling, a ball screw, a ball screw nut, and a bearing seat; the motor is fixed to the middle lower part in front of the column, the bearing seat is fixed to the middle upper part in front of the column, the ball screw nut is fixed in the hole of the rear extension of the box body, the ball screw is screwed with the ball screw nut, its lower end is connected to the stepper motor through a coupling, and its top end is connected to the bearing in the bearing seat.

[0006] Furthermore, the spindle box also includes an upper pressure cover; the upper pressure cover is connected to the upper end surface of the upper flange, and the small diameter section of the upper pressure cover cooperates with the inner hole of the upper flange and presses the upper end surface of the needle roller bearing without an inner ring.

[0007] Furthermore, the spindle box also includes a lower oil seal and an upper oil seal; the lower oil seal is arranged in a hole below the box body and is located below the lower bearing, and the upper oil seal is arranged in a hole in the upper flange and is located below the needle roller bearing without an inner ring.

[0008] Furthermore, the upper flange is provided with two symmetrical disassembly threaded holes.

[0009] Furthermore, the spindle box also includes a shaft retaining ring and a hole retaining ring; the shaft retaining ring is arranged on the spindle and presses the upper end surface of the lower bearing, and the hole retaining ring is arranged in the hole below the spindle box and presses the lower end surface of the lower bearing.

[0010] Furthermore, the spindle box also includes a tension wheel assembly and a tension spring; the tension wheel assembly and the tension spring are both connected to the mounting base plate of the motor, and the tension spring is connected to the tension wheel assembly.

[0011] Furthermore, the guide rail assembly includes two linear guide rails and four guide rail sliders; the two linear guide rails are fixed in front of the column and are symmetrical with respect to the ball screw, and two upper and lower guide rail sliders are fixed at the left and right ends of the rear of the box body, and the guide rail sliders are connected with the linear guide rails to form a linear motion pair.

[0012] Furthermore, the drilling machine also includes a gravity balance system, which includes a pulley assembly, a counterweight, and a steel wire rope; the pulley assembly is fixed to the top of the column, and the steel wire rope passes through the pulley assembly, with one end connected to the top of the spindle box and the other end connected to the counterweight; the counterweight is located in the cavity of the column.

[0013] Furthermore, the pulley assembly includes a pulley mounting plate, two front and rear pulley units, each pulley unit includes a pulley bracket, a pulley shaft roller, a small end cover, and a pulley bearing; the pulley mounting plate is fixed to the top of the column, the pulley bracket is fixed on the top of the pulley mounting plate, the pulley bearing is arranged in the holes at the left and right ends of the pulley bracket, the two ends of the pulley shaft roller are connected to the pulley bearing, the small end cover is fixed to the left and right ends of the pulley bracket, and the wire rope is embedded in the front and rear pulley shaft rollers.

[0014] The drilling machine of the present invention adopts an inverted structural layout design, with the drill bit at the bottom and the workpiece to be processed at the top: the drill tip on the machine base is fixed upward, and the workpiece to be processed moves downward while following the rotation of the main shaft, forming a composite motion of drilling and feeding, thereby processing small-diameter deep holes. Its advantages are: during the processing process, the chips generated during drilling are automatically discharged downward under the dual effects of blade extrusion and gravity, and automatically fall into the cavity of the open and hollow machine base base and are cleaned regularly. Therefore, the drilling machine of the present invention can effectively solve the problem of difficult chip removal during the drilling process of small-diameter deep holes, and no longer needs to frequently withdraw the drill bit to take out the chips inside to prevent blockage, thereby greatly improving the processing efficiency, and the timely discharge of chips makes the surface quality of the processed deep holes higher than that of ordinary processing methods; the degree of automation is higher than that of traditional processing methods, the operation is simple, and the labor intensity of the operator is reduced; the chips are concentrated and fall into the inner cavity of the machine base, so that the processing area environment is kept clean, and it is more convenient to remove chips regularly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional drilling machine of the present invention. Figure 1 .

[0016] Figure 2 It is a three-dimensional drilling machine of the present invention. Figure 2 .

[0017] Figure 3 It is the front view of the drilling machine of the present invention.

[0018] Figure 4 It is the right side view of the drilling machine of the present invention.

[0019] Figure 5 It is a three-dimensional diagram of the base.

[0020] Figure 6 It is the structural diagram of the spindle box.

[0021] Figure 7 It is a cross-sectional view of the spindle box.

[0022] Figure 8 It is a three-dimensional diagram of the pulley assembly.

[0023] Fig. 9 is a cross-sectional view of the pulley unit.

[0024] Explanation of the reference numerals in the accompanying drawings: 100, machine base; 100 / 1, machine base body; 100 / 2, center flange; 100 / 3, rib plate; 100 / 4, chip removal door; 102, drill sleeve flange; 103, quick-change drill chuck; 104, drill bit; 200, spindle box; 201, spindle box body; 202, spindle; 203, three-jaw chuck; 204, lower oil seal; 205, small bearing; 206, large pulley; 207, upper oil seal; 208, upper flange; 209, needle roller bearing without inner ring; 210, upper pressure cover; 211, multi-V belt; 212, tension wheel assembly; 213, small pulley; 214, tension wheel assembly Spring; 215, frequency conversion motor; 216, workpiece to be processed; 217, retaining ring for shaft; 218, retaining ring for hole; 219, outlet bracket; 220, side box cover; 300, column; 301, stepper motor seat; 302, stepper motor; 303, guide rail slider; 304, coupling; 305, ball screw; 306, ball screw nut; 307, bearing seat; 308, linear guide; 400, top pulley group; 401, pulley mounting plate; 402, pulley bracket; 403, pulley shaft roller; 404, small end cover; 405, pulley bearing; 406, counterweight; 407, wire rope. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0026] Example 1

[0027] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be seen that the present invention is a self-chip removal small-diameter deep hole drilling machine, which includes a machine base 100, a column 300, a spindle box 200, a feed mechanism, a guide rail assembly, and a drill assembly; the machine base 100 includes a machine base base body 100 / 1, a center flange seat 100 / 2, and a rib plate 100 / 3, and the drill assembly includes a drill sleeve flange 102, a quick-change drill chuck 103, and a drill 104; the front part of the machine base body 100 / 1 is a fully open structure on the top, and the center flange seat 100 / 2 is composed of four triangular rib plates inside the machine base body 100 / 1. The support 100 / 3 is in a suspended state; the drill sleeve flange 102 is connected to the center flange seat 100 / 2, the quick-change drill chuck 103 is connected to the drill sleeve flange 102 and is perpendicular to the machine base 100 / 1, and the drill bit 104 is installed on the quick-change drill chuck 103 with the drill tip facing upward; the column 300 is fixed on the upper rear part of the machine base 100 / 1, the spindle box 200 is located above the front part of the machine base 100 / 1, the feed mechanism is connected to the spindle box 200, and the spindle box 200 moves up and down along the column 300 through the guide rail assembly.

[0028] Among them, the machine base 100 and the column 300 are the basic bearing components, the spindle box 200 is the main functional component, the spindle box 200 is connected to the column 300 through the guide rail assembly, and the feeding movement and rapid movement are realized through the feeding mechanism. The cutting feed and rapid movement are all controlled by the CNC system program. If a servo system, an electric chuck, and a manipulator are further used to load and unload workpieces, fully automated processing can be achieved.

[0029] The working principle of the drilling machine of the present invention is as follows: the workpiece and the drill bit are arranged upside down, that is, the drill bit 104 is at the bottom, with its drill tip facing upward and fixed, and the workpiece 216 is at the top, which is rotated and fed downward through the spindle box 200, so as to perform drilling processing of small-diameter deep holes; wherein, the chips generated during the drilling process automatically fall downward into the cavity of the upper open and hollow machine base 100 / 1 by the dual effects of blade extrusion and gravity, thereby solving the chip removal problem of small-diameter deep hole processing. Therefore, the drilling machine of the present invention can effectively solve the problem of difficult chip removal during the drilling process of small-diameter deep holes, and it is no longer necessary, thereby greatly improving the processing efficiency, and the surface quality of the processed deep holes is higher than that of ordinary processing methods; the degree of automation is higher than that of traditional processing methods, the operation is simple, and the labor intensity of the operator is reduced; the chips are concentrated and fall into the inner cavity of the machine base, so that the processing area environment is kept clean, and it is more convenient to remove chips regularly.

[0030] Example 2

[0031] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7It can be known that the drilling machine of the present invention: the spindle box 200 includes a box body 201, a spindle 202, a lower bearing 205, a large pulley 206, an upper flange 208, a needle roller bearing 209 without an inner ring, a multi-V belt 211, a small pulley 213, and a motor 215; the spindle 202 and the motor 215 are vertically installed in parallel in the box body 201; the large pulley 206 is connected to the spindle 202, and the small pulley 213 is connected to the output shaft of the motor 215. The large pulley 206 and the small pulley 213 are at the same height and are connected by the multi-V belt 211; the upper flange 208 is matched with the hole on the box body 201 and is connected to the top surface of the box body 201, and the needle roller bearing 209 without an inner ring is arranged in the hole of the upper flange 208; the lower bearing 205 is arranged in the hole below the box body 201; the upper and lower ends of the main shaft 202 are respectively connected with the inner ringless needle bearing 209 and the lower bearing 205; the feeding mechanism includes a motor 302, a flange 303, a coupling 304, a ball screw 305, a ball screw nut 306, and a bearing seat 307; the motor 302 is fixed to the middle lower part in front of the column 300, the bearing seat 307 is fixed to the middle upper part in front of the column 300, the ball screw nut 306 is fixed in the hole of the rear extension part of the box body 201, the ball screw 305 is screwed with the ball screw nut 306, the lower end of which is connected to the stepper motor 302 through the coupling 304, and the top end of which is connected to the bearing in the bearing seat 307.

[0032] The motor 215 is a variable frequency motor; the motor 302 is a stepper motor or a servo motor.

[0033] Among them, using the stepper motor 302 and the ball screw pairs 305 and 306 can reduce the manufacturing cost.

[0034] When the workpiece 216 is processed, the three-jaw chuck 203 is connected to the lower end of the spindle 202, and the workpiece 216 is connected to the three-jaw chuck 203, so that the opening of the small-diameter deep hole faces downward. The motor 302 works, and drives the spindle box 200 to move up and down along the column 300 through the guide rail assembly through the ball screw 305 and the ball screw nut 306, thereby realizing the downward feeding movement and rapid upward return of the spindle box 200; the motor 215 works, and transmits power through the small pulley 213, the multi-wedge belt 211, and the large pulley 206, so that the spindle 202 drives the workpiece 216 to rotate through the three-jaw chuck 203. In this way, the drill bit 104 is fixed with the drill tip facing upward, and the workpiece 216 rotates and feeds downward through the spindle 202, realizing the drilling of the small-diameter deep hole on the workpiece; at the same time, the iron chips generated during the processing fall into the machine base 100 / 1 along the chip removal groove of the drill bit.

[0035] Example 3

[0036] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be known that the drilling machine of the present invention: the spindle box 200 also includes an upper pressure cover 210; the upper pressure cover 210 is connected to the upper end surface of the upper flange 208, and the small diameter section of the upper pressure cover 210 cooperates with the inner hole of the upper flange 208 and presses the upper end surface of the needle roller bearing 209 without an inner ring.

[0037] The upper pressure cover 210 reliably positions the axial position of the needle roller bearing 209 without an inner ring, and can be assembled and disassembled together with the upper flange 208 .

[0038] Example 4

[0039] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be seen that the drilling machine of the present invention: the spindle box 200 also includes a lower oil seal 204 and an upper oil seal 207; the lower oil seal 204 is arranged in the hole below the box body 201 and is located below the lower bearing 205, and the upper oil seal 207 is arranged in the hole of the upper flange 208 and is located below the inner ringless needle bearing 209.

[0040] When assembling the spindle box, install the upper oil seal 207 and the needle bearing without inner ring 209 in sequence, fill in grease, install the upper pressure cover 210, fix the axial position of the needle bearing without inner ring 209 and form a closed space to prevent the lubricating oil from overflowing downwards; the lower oil seal 204 ensures that the lubricating grease in the lower bearing 205 will not leak out of the box body.

[0041] Example 5

[0042] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be seen that in the drilling machine of the present invention: the upper flange 208 is provided with two symmetrical disassembly threaded holes 208 / 1.

[0043] When the multi-V belt needs to be replaced, just remove the screws connecting the upper flange 208 and the top surface of the box body 201, and then use bolts to lift the two disassembly threaded holes 208 / 1. The four parts of the upper flange 208, the upper oil seal 207, the inner ringless needle bearing 209, and the upper pressure cover 210 can be removed together, and the multi-V belt can be inserted from the annular space around the main shaft 202 into the main shaft box 201 for replacement. That is, the multi-V belt 211 can be quickly replaced without disassembling the main shaft.

[0044] Example 6

[0045] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be known that the drilling machine of the present invention: the spindle box 200 also includes a shaft retaining ring 217 and a hole retaining ring 218; the shaft retaining ring 217 is arranged on the spindle 202 and presses the upper end surface of the lower bearing 205, and the hole retaining ring 218 is arranged in the hole below the spindle box 201 and presses the lower end surface of the lower bearing 205.

[0046] The upward drilling resistance force on the main shaft 202 is transmitted to the housing through the lower bearing 205, so the axial fixation of the main shaft 202 is placed at the lower end, that is, the main shaft 202 and the lower bearing 205 are axially limited by the shaft retaining ring and the hole retaining ring at the lower end: the hole retaining ring fixes the outer ring of the lower bearing 205, and the shaft retaining ring is used to fix the main shaft axially through the lower bearing 205.

[0047] Example 7

[0048] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be seen that the drilling machine of the present invention: the spindle box 200 also includes a tension wheel assembly 212 and a tension spring 214; the tension wheel assembly 212 and the tension spring 214 are both connected to the mounting base plate of the motor 215, and the tension spring 214 is connected to the tension wheel assembly 212.

[0049] The tension spring 214 tensions the tension wheel assembly 212 so that the tension wheel assembly 212 is pressed against the side of the poly-V belt 211 , so that the tension of the poly-V belt 211 is always kept in a good state, ensuring that the motor 215 reliably transmits power to the main shaft 202 through the poly-V belt 211 .

[0050] Example 8

[0051] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be known that the drilling machine of the present invention: the spindle box 200 also includes a wire outlet bracket 219, the wire outlet bracket 219 is fixedly connected to the back of the box body 200, and the power line of the motor 216 passes through the wire outlet bracket 219 and enters the cavity of the column 300.

[0052] Since the power of the spindle drive motor 216 is relatively small, a spiral telescopic power cord is used instead of a drag chain type to reduce manufacturing costs.

[0053] Example 9

[0054] from Figure 1 , Figure 2 , Figure 3, Figure 4 , Figure 6 , Figure 7 It can be known that the drilling machine of the present invention: the feeding mechanism also includes a motor base 301, and the motor base 301 is arranged outside the motor 302 and connected to the column 300.

[0055] Example 10

[0056] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 It can be known that the drilling machine of the present invention: the guide rail assembly includes two linear guide rails 308 and four guide rail sliders 303; the two linear guide rails 308 are fixed in front of the column 300 and are symmetrical with respect to the ball screw 305, and two upper and lower guide rail sliders 303 are fixed to the left and right ends of the rear of the box body 200, and the guide rail sliders 303 are connected with the linear guide rails 308 to form a linear motion pair.

[0057] The motor 302 works, and drives the spindle box to move up and down along the linear guide 308 through the guide slider 303 through the ball screw 305 and the ball screw nut 306, thereby realizing the downward feed movement and upward rapid return of the spindle box 200; in this way, the drill bit 104 is fixed with the drill tip facing upward, and the workpiece 216 is rotated and fed downward through the spindle 202, thereby realizing the processing of small-diameter deep holes on the workpiece.

[0058] Embodiment 11

[0059] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , Fig. 9 It can be seen that the drilling machine of the present invention: the drilling machine also includes a gravity balance system, the gravity balance system includes a pulley assembly 400, a counterweight block 406, and a wire rope 407; the pulley assembly 400 is fixed to the top of the column 300, and the wire rope 407 passes through the pulley assembly 400, one end of which is connected to the top of the spindle box 200 and the other end is connected to the counterweight block 406; the counterweight block 406 is located in the cavity of the column 300.

[0060] The steel wire rope 407 achieves gravity balance by connecting the main spindle box 200 and the counterweight block 406 at both ends, thereby reducing the load of the main spindle box 200 for rapid return and ensuring the lightness of rapid movement.

[0061] Example 12

[0062] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , Fig. 9 It can be known that the drilling machine of the present invention: the pulley assembly 400 includes a pulley mounting plate 401, two front and rear pulley units, each pulley unit includes a pulley bracket 402, a pulley shaft roller 403, a small end cover 404, and a pulley bearing 405; the pulley mounting plate 401 is fixed to the top of the column 300, the pulley bracket 402 is fixed on the pulley mounting plate 401, the pulley bearing 405 is arranged in the holes at the left and right ends of the pulley bracket 402, the two ends of the pulley shaft roller 403 are connected to the pulley bearing 405, the small end cover 404 is fixed to the left and right ends of the pulley bracket 402, and the wire rope 407 is embedded in the front and rear pulley shaft rollers 403.

[0063] The wire rope 407 is connected to the top of the main spindle box 200 and the counterweight block 406 through the front and rear pulley shaft rollers 403, achieving relative gravity balance, thereby reducing the load of the main spindle box 200 for rapid return, creating favorable conditions for selecting a stepper motor with appropriate power, and reducing manufacturing costs.

[0064] Embodiment 13

[0065] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be known that the drilling machine of the present invention: the machine base 100 also includes a chip removal door 100 / 4; the chip removal door 100 / 4 is arranged on the side of the machine base body 100 / 1.

[0066] The chip removal door 100 / 4 can be used to conveniently and regularly remove the cutting chips that have fallen into the machine base body 100 / 1.

[0067] The drilling machine of the present invention adopts an inverted structural layout design, with the drill bit 104 at the bottom and the workpiece 216 to be processed at the top: the drill bit 104 located on the machine base 100 is fixed with the drill tip facing upward, and the workpiece 216 to be processed moves downward while following the rotation of the spindle 202, forming a composite motion of drilling and feeding, thereby processing small-diameter deep holes, and its advantages are: during the processing process, the chips generated during drilling are automatically discharged downward under the dual effects of blade extrusion and gravity, and automatically fall into the cavity of the open and hollow machine base base 100 / 1 above and are cleaned regularly. Therefore, the drilling machine of the present invention can effectively solve the problem of difficult chip removal during the drilling process of small-diameter deep holes, thereby greatly improving the processing efficiency, and the surface quality of the processed deep holes is higher than that of ordinary processing methods; the degree of automation is higher than that of traditional processing methods, the operation is simple, and the labor intensity of the operator is reduced; the chips are concentrated and fall into the inner cavity of the machine base, so that the processing area environment is kept clean, and it is more convenient to remove chips regularly.

[0068] In summary, the self-chip removal small-diameter deep hole drilling machine of the present invention fills the gap of the lack of corresponding equipment for machining small-diameter deep holes, and has a relatively simple structure, low manufacturing cost, and convenient operation, and is particularly suitable for machining small-diameter deep holes.

[0069] This embodiment is only a general description, which is not restrictive. The drawings are only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection of the present invention.

Claims

1. A self-chip removal small diameter deep hole drilling machine, characterized by: It comprises a machine base (100), a column (300), a spindle box (200), a feed mechanism, a guide rail assembly, and a drill assembly; the machine base (100) comprises a machine base base body (100 / 1), a center flange seat (100 / 2), and a rib plate (100 / 3); the drill assembly comprises a drill sleeve flange (102), a quick-change drill chuck (103), and a drill bit (104); the front part of the machine base base body (100 / 1) is a fully open structure on the top, and the center flange seat (100 / 2) is supported by four triangular rib plates (100 / 3) inside the machine base base body (100 / 1) in a cantilevered manner. The drill sleeve flange (102) is connected to the center flange seat (100 / 2), the quick-change drill chuck (103) is connected to the drill sleeve flange (102) and is perpendicular to the machine base (100 / 1), and the drill bit (104) is installed on the quick-change drill chuck (103) with the drill tip facing upward; the column (300) is fixed on the upper rear part of the machine base (100 / 1), the spindle box (200) is located above the front part of the machine base (100 / 1), the feed mechanism is connected to the spindle box (200), and the spindle box (200) moves up and down along the column (300) through the guide rail assembly.

2. The drilling machine according to claim 1, characterized in that: The spindle box (200) comprises a box body (201), a main shaft (202), a lower bearing (205), a large pulley (206), an upper flange (208), a needle roller bearing without an inner ring (209), a multi-V belt (211), a small pulley (213), and a motor (215); the main shaft (202) and the motor (215) are vertically installed in parallel in the box body (201); the large pulley (206) is connected to the main shaft (202), the small pulley (213) is connected to the output shaft of the motor (215), the large pulley (206) and the small pulley (213) are at the same height and are connected by the multi-V belt (211); the upper flange (208) is matched with a hole on the upper side of the box body (201) and is connected to the top surface of the box body (201), and the needle roller bearing without an inner ring (209) is arranged in the hole of the upper flange (208); The bearing (205) is arranged in a hole below the housing (201); the upper and lower ends of the main shaft (202) are respectively connected to the needle bearing (209) without inner ring and the lower bearing (205); the feeding mechanism comprises a motor (302), a coupling (304), a ball screw (305), a ball screw nut (306), and a bearing seat (307); the motor (302) is fixed at the middle lower part in front of the column (300), the bearing seat (307) is fixed at the middle upper part in front of the column (300), the ball screw nut (306) is fixed in the hole of the rear extension part of the housing (201), the ball screw (305) is screwed with the ball screw nut (306), the lower end of which is connected to the stepping motor (302) through the coupling (304), and the top end of which is connected to the bearing in the bearing seat (307).

3. The drilling machine according to claim 2, characterized in that: The spindle box (200) also includes an upper pressure cover (210); the upper pressure cover (210) is connected to the upper end surface of the upper flange (208), and the small diameter section of the upper pressure cover (210) cooperates with the inner hole of the upper flange (208) and presses the upper end surface of the needle roller bearing without inner ring (209).

4. The drilling machine according to claim 2, characterized in that: The spindle box (200) further comprises a lower oil seal (204) and an upper oil seal (207); the lower oil seal (204) is arranged in a hole below the box body (201) and is located below the lower bearing (205); the upper oil seal (207) is arranged in a hole of the upper flange (208) and is located below the inner ringless needle roller bearing (209).

5. The drilling machine according to claim 2, characterized in that: The upper flange (208) is provided with two symmetrical disassembly threaded holes (208 / 1).

6. The drilling machine according to claim 2, characterized in that: The spindle box (200) further comprises a shaft retaining ring (217) and a hole retaining ring (218); the shaft retaining ring (217) is arranged on the spindle (202) and presses the upper end surface of the lower bearing (205); the hole retaining ring (218) is arranged in a hole below the spindle box (201) and presses the lower end surface of the lower bearing (205).

7. The drilling machine according to claim 2, characterized in that: The spindle box (200) further comprises a tension wheel assembly (212) and a tension spring (214); the tension wheel assembly (212) and the tension spring (214) are both connected to the mounting base plate of the motor (215), and the tension spring (214) is connected to the tension wheel assembly (212).

8. The drilling machine according to claim 1, characterized in that: The guide rail assembly comprises two linear guide rails (308) and four guide rail sliders (303); the two linear guide rails (308) are fixed in front of the column (300) and are symmetrical with respect to the ball screw (305); two upper and lower guide rail sliders (303) are fixed at the left and right ends of the rear of the box body (200); the guide rail sliders (303) are connected with the linear guide rails (308) to form a linear motion pair.

9. The drilling machine according to claim 1, characterized in that: The drilling machine also includes a gravity balance system, which includes a pulley assembly (400), a counterweight (406), and a steel wire rope (407); the pulley assembly (400) is fixed to the top of the column (300), and the steel wire rope (407) passes through the pulley assembly (400), one end of which is connected to the top of the spindle box (200) and the other end is connected to the counterweight (406); the counterweight (406) is located in the cavity of the column (300).

10. The drilling machine according to claim 9, characterized in that: The pulley assembly (400) comprises a pulley mounting plate (401), two front and rear pulley units, each pulley unit comprises a pulley bracket (402), a pulley shaft roller (403), a small end cover (404), and a pulley bearing (405); the pulley mounting plate (401) is fixed to the top of the column (300), the pulley bracket (402) is fixed on the pulley mounting plate (401), the pulley bearing (405) is arranged in the holes at the left and right ends of the pulley bracket (402), the two ends of the pulley shaft roller (403) are connected to the pulley bearing (405), the small end cover (404) is fixed to the left and right ends of the pulley bracket (402), and the wire rope (407) is embedded in the front and rear pulley shaft rollers (403).

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