A CNC drilling machine tool

Abstract

The present application relates to the technical field of CNC drilling machines, and discloses a CNC drilling machine. When the present invention controls the connecting shaft to move downward through the CNC machine, the airflow ejected from the air guide hole will preferentially eject the waste chips in the borehole upward, and the cutting disc can continuously chop up the longer waste chips generated in the borehole when the drill is drilling, which is convenient for the airflow to eject them on the one hand, and avoids the entanglement of the waste chips on the other hand. Finally, the CNC machine controls the connecting shaft to move upward, and the ejection of the chip removal block can further discharge the waste chips remaining in the borehole, and finally achieve the effect of cutting longer waste chips to avoid entanglement, and quickly discharge the chopped waste chips, which solves the problem that when the drilling depth is too deep and the waste chips are too long, the short-distance up and down reciprocating action still cannot quickly discharge the long waste chips at the bottom of the borehole, and there is still a risk of waste chips entanglement.

Description

Technical Field

[0001] The present application relates to the technical field of CNC drilling machine tools, and in particular to a CNC drilling machine tool. Background Art

[0002] Compared with ordinary machine tools, CNC machine tools use programming technology combined with sensor elements and related mechanical parts to complete various automated machine tool tasks, effectively improve work efficiency and reduce manual labor intensity. A large amount of waste chips will be generated when drilling holes on the machine tool and the workpiece surface. The deeper the processing depth, the longer the length of the waste chips is generally. These waste chips are prone to continuous entanglement with the drill rod during the high-speed rotation of the drill rod. These entangled clumps of waste chips will not only cause a large number of scratches on the surface of the workpiece, affecting the aesthetics of the workpiece surface, but also affect the effect of full contact between the coolant and the drill rod surface, resulting in a decrease in the cooling effect of the drill rod and dry grinding problems, increasing the risk of wear and breakage of the drill rod. Generally, CNC machine tools use indirect reciprocating drilling when drilling. The indirect reciprocating up and down action can effectively bring out some of the waste chips, avoiding the problem of waste chips being unable to be quickly discharged from the drilling hole during the continuous high-speed rotation of the drill rod and entanglement.

[0003] Although the use of indirect reciprocating drilling can reduce the risk of not being able to discharge waste chips in time during the drilling process of CNC machine tools, when the drilling depth is too deep and the waste chips are too long, the short-distance up and down reciprocating movement still cannot quickly discharge the long waste chips at the bottom of the hole, and there is still the problem of the risk of waste chips entanglement. In order to discharge the long waste chips, the drill bit needs to move back and forth over a long distance. This operation can easily cause the drill bit to damage the inner wall structure of the hole and affect the drilling quality. Summary of the invention

[0004] The present application proposes a CNC drilling machine tool, which has relevant components for generating airflow and cutting waste chips by controlling a connecting shaft to perform up and down reciprocating motion using a CNC machine tool, and quickly cutting longer waste chips generated in the borehole and driving the subsequently ejected airflow to eject them upward from the borehole, thereby ultimately achieving the advantage of preventing the long waste chips from being unable to be quickly discharged, resulting in accumulation and entanglement. The problem is solved by indirect reciprocating drilling, which can reduce the risk of waste chips not being able to be discharged in time during the drilling process of a CNC machine tool. However, when the drilling depth is too deep and the waste chips are too long, the short-distance up and down reciprocating motion still cannot quickly discharge the long waste chips at the bottom of the borehole, and there is still a risk of waste chip entanglement.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a CNC drilling machine tool, comprising a mounting head installed on a CNC machine tool drive device, a connecting shaft for cleaning waste chips is installed at the bottom of the mounting head, a sealing chamber and a piston chamber are respectively opened in the connecting shaft, and the sealing chamber is located above the piston chamber, a piston shaft, a piston at the top of the piston shaft is connected to the piston chamber, and a drill bit for drilling is fixedly installed at the bottom, a first spring, the first spring is fixedly connected between the top of the piston shaft and the inner wall of the piston chamber, and is used to assist the piston shaft to move forward The air guide hole is provided at the bottom of the inner wall of the sealing cavity and penetrates downwardly through the bottom end of the connecting shaft for jetting chips to be removed from the bottom of the drilling hole. The three-way pipe has the bottom end connected to the bottom of the inner wall of the sealing cavity and is provided with a second one-way valve. Both ends of the three-way pipe penetrate the inner wall of the sealing cavity horizontally. The bottom of the inner wall of the sealing cavity is connected with a first one-way valve. The first one-way valve and the three-way pipe are both connected to the piston cavity. A cleaning component for cleaning chips accumulated near the drilling hole is provided near the top of the connecting shaft.

[0006] Furthermore, an anti-collision block is fixedly connected to the top of the inner wall of the piston cavity, and the anti-collision block is located at the center of the first spring.

[0007] Furthermore, there are a plurality of air guide holes, which are distributed in a ring shape at the bottom of the inner wall of the sealed cavity, and the diameter of the top port of the air guide hole is larger than the diameter of the bottom port.

[0008] Furthermore, a cutting assembly is provided at the bottom end of the piston shaft, and the cutting assembly includes a cutting disc, and the cutting disc is sleeved and fixed on the piston shaft near the drill bit. A strip vertical groove is opened at the bottom end of the piston shaft, and a chip removal block for chip removal is rotatably connected to the top of the inner wall of the strip vertical groove, and a third spring is fixedly connected between the chip removal block and the strip vertical groove. There are multiple strip vertical grooves, chip removal blocks and third springs, and they are distributed in a corresponding ring shape.

[0009] Furthermore, the cleaning assembly includes an external ring, which is sleeved on the connecting shaft near the mounting head, a fixing block is fixedly connected to the top of the external ring and the outer arc surface of the connecting shaft, a cleaning block is rotatably connected to the outer wall of the external ring, a second spring is fixedly connected between the top of the cleaning block and the outer wall of the connecting shaft, a magnetic block is embedded in the bottom side wall of the cleaning block relative to the connecting shaft, and a magnetic ring with opposite magnetic properties to the magnetic block is embedded near the top of the piston shaft.

[0010] Furthermore, there are multiple fixing blocks, cleaning blocks, second springs and magnetic blocks, which are correspondingly distributed in an annular shape on the outside of the connecting shaft.

[0011] Furthermore, the connecting shaft is embedded with a magnetic-blocking sleeve near the bottom end thereof for reducing the magnetic attraction of the magnetic ring to the outside world.

[0012] Furthermore, the outer side angle of the cleaning block is an obtuse angle, and the surface is smooth, and the upper end of the cleaning block above the rotation point remains parallel to the connecting axis.

[0013] Furthermore, the maximum rising distance of the piston shaft is the same as the distance between the upper surface of the piston shaft and the lower surface of the anti-collision block under normal conditions.

[0014] Furthermore, the end diameter of the connecting shaft is smaller than the end diameter of the drill bit.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present application provides a CNC drilling machine tool, which continuously presses down the connecting shaft so that the drill bit pushes the piston shaft in the opposite direction to move upward in the piston chamber, squeezing the air in the piston chamber. Because the top of the piston chamber is connected to the sealing chamber through the first one-way valve, the compressed air in the piston chamber will enter the sealing chamber through the first one-way valve, and the air guide hole opened at the bottom of the sealing chamber passes through the bottom of the connecting shaft and is connected to the outside, so that the compressed gas entering the sealing chamber will be ejected from the bottom of the connecting shaft through the air guide hole, blowing the waste chips upward, and ejecting the waste chips remaining in the drill hole from the gap between the outer arc surface of the connecting shaft and the drill hole, so as to achieve the effect of quickly cleaning the debris remaining in the drill hole;

[0017] At the same time, the piston shaft and the mounting head can be axially relatively movable and, under the priority elastic force of the first spring, the drill bit can maintain its position during a stroke of lifting and discharging waste chips, thereby reducing the movement stroke of the drill bit and reducing the probability of damage to the inner wall of the drilled hole.

[0018] During the period, in conjunction with the cutting component, when the drill bit rotates and drills, the cutting disc will continue to cut the long waste chips drilled by the drill bit into smaller fragments, so that the airflow ejected from the air guide hole can quickly discharge them out of the drill hole, thereby solving the problem of long waste chips being easily entangled with the drill bit and the connecting shaft from the source. During the period, during the rising process of the piston shaft, the chip removal block originally squeezed in the strip vertical groove will expand outward under the elastic force of the third spring when it is compressed and reset, forming an umbrella rib shape, and then the waste chips remaining in the drill hole will be discharged upward during the upward movement of the piston shaft, further improving the waste chip discharge effect. On the contrary, in the process of the connecting shaft descending and abutting the top of the cutting disc, multiple chip removal blocks are pushed by the bottom end of the connecting shaft and gradually enter the strip vertical groove to complete the contraction. This contraction action can avoid affecting the discharge of waste chips when the drill bit is working, and solves the problem that when the drilling depth is too deep and the waste chips are too long, the short-distance up and down reciprocating action still cannot quickly discharge the long waste chips at the bottom of the drill hole, and there is still a risk of waste chip entanglement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work:

[0020] Figure 1 It is a partial structural schematic diagram of the present invention;

[0021] Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention after the cutting assembly is installed;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure between the connecting shaft and the piston shaft in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the connecting shaft and the cleaning assembly in the present invention;

[0025] Figure 6 It is a structural schematic diagram of the connecting shaft and the bottom of the cleaning component in the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the connecting shaft and the cutting assembly in the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of area A in the middle;

[0028] Fig. 9 It is a schematic diagram of the structure of the sealing cavity and the three-way pipe in the present invention.

[0029] In the figure: 1. mounting head; 2. connecting shaft; 201. sealing chamber; 202. piston chamber; 203. piston shaft; 204. first spring; 205. air guide hole; 206. anti-collision block; 207. three-way pipe; 208. first non-return valve; 209. second non-return valve; 3. drill bit; 4. cutting assembly; 401. cutting disc; 402. strip vertical groove; 403. chip removal block; 404. third spring; 5. cleaning assembly; 501. peripheral ring; 502. fixing block; 503. cleaning block; 504. second spring; 505. magnetic block; 506. magnetic ring; 507. magnetic blocking sleeve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] like Figure 1-Figure 2 , the top end of the connecting shaft 2 is fixedly installed at the bottom of the mounting head 1, and the top piston of the piston shaft 203 is connected to the piston cavity 202 opened at the bottom end of the connecting shaft 2. The piston shaft 203 and the connecting shaft 2 need to be driven to realize rotation. It can be adopted that: the piston part of the piston shaft 203 is set to be square and adapted to the piston cavity 202, and the corners are rounded for sliding sealing; or it can be adopted that: the inner arc surface of the piston cavity 202 is provided with four annular arrays of vertical limit grooves, and the outer arc surface of the piston shaft 203 is fixedly connected with sealing piston strips adapted thereto at the four vertical limit grooves, so that when the connecting shaft 2 fixedly connected to the bottom of the mounting head 1 rotates, the piston shaft 203 can be driven to rotate synchronously through the limiting relationship between the sealing piston strip and the vertical limit groove. A drill bit 3 is fixedly installed at the bottom end of the piston shaft 203, and a segmented combination installation method of the connecting shaft 2, the piston shaft 203 and the drill bit 3 is adopted. On the one hand, compared with the spiral groove on the surface of the twist drill of the traditional long drill rod, which is easy to be entangled with waste chips, the surface of the connecting shaft 2 in the present invention is smooth, the friction resistance of the entanglement is low, and the effect of not being easy to be entangled is achieved. On the other hand, when the drill bit 3 is worn out after long-term use and is replaced, only the drill bit 3 needs to be replaced separately, and the machine tool and related components for cleaning waste chips inside to avoid entanglement are not affected, and it is convenient to put it into use quickly after maintenance, thereby achieving the effect of convenient maintenance and low maintenance cost.

[0033] When the CNC machine tool controls the mounting head 1 to approach the top of the workpiece, the connecting shaft 2 fixedly installed in the mounting head 1 will drive the drill bit 3 directly below it to fit the upper surface of the workpiece first, and in the process of continuous downward pressure, the drill bit 3 will reversely push the piston shaft 203 to move upward in the piston chamber 202, squeezing the air in the piston chamber 202. Because the top of the piston chamber 202 is connected to the sealing chamber 201 through the first one-way valve 208, the compressed air in the piston chamber 202 will enter the sealing chamber 201 through the first one-way valve 208, and the air guide hole 205 opened at the bottom of the sealing chamber 201 passes through the bottom of the connecting shaft 2 and is connected to the outside world, so that the compressed gas entering the sealing chamber 201 will be ejected from the bottom of the connecting shaft 2 through the air guide hole 205, blowing the waste chips upward, and ejecting the waste chips remaining in the drill hole from the gap between the outer arc surface of the connecting shaft 2 and the drill hole, so as to achieve the effect of quickly cleaning the debris remaining in the drill hole. On the contrary, when the CNC machine tool drives the mounting head 1 and the connecting shaft 2 When moving upward, the downward force on the drill bit 3 will become smaller and smaller, and it will eventually break away from the bottom of the borehole. The upward movement at this time is to relieve the high temperature caused by the continuous abutment friction and to bring out some waste chips. As the connecting shaft 2 rises, the first spring 204, which was originally compressed and deformed, begins to elastically reset, and the space between the top of the piston shaft 203 and the piston chamber 202 gradually increases. The first spring 204 assists in pushing the piston shaft 203 to reset. During this process, negative pressure is generated in the piston chamber 202, and air is sucked from the outside through the second one-way valve 209 and the three-way pipe 207 to maintain the air pressure in the piston chamber 202 close to the atmospheric pressure. Finally, in the process of the CNC machine tool controlling the drill bit 3 to perform indirect reciprocating drilling up and down, the circulation change of air pressure is used to effectively eject the debris deep in the borehole, thereby reducing the risk of wear on the borehole and the borehole caused by the friction between the debris and the drill bit 3 in the borehole. At the same time, air circulation is also used to take away part of the heat at the drill bit 3, effectively extending the service life of the drill bit 3.

[0034] In the above process, the air flows in the first one-way valve 208 from bottom to top, while the air flows in the second one-way valve 209 from top to bottom, thereby ensuring that the air is normally sprayed into the bottom of the borehole during the movement of the piston shaft 203 and is normally replenished into the piston chamber 202 from the outside.

[0035] Embodiment 2

[0036] Further improvements are made on the basis of the first embodiment, such as Figure 3-Figure 6During the drilling process of the drill bit 3 rotating, the cutting disc 401 will continue to cut the long waste chips drilled by the drill bit 3 into small chips, so that the airflow ejected from the air guide hole 205 can quickly discharge them out of the drilling hole, thereby solving the problem that the long waste chips are easily entangled with the drill bit 3 and the connecting shaft 2 from the source. During this period, during the rising process of the piston shaft 203, the chip removal block 403 originally squeezed in the strip vertical groove 402 will expand outward under the elastic force of the third spring 404 when it is compressed and reset, forming an umbrella rib shape, and then the waste chips remaining in the drilling hole will be discharged upward during the upward movement of the piston shaft 203, further improving the waste chip discharge effect. On the contrary, during the process of the connecting shaft 2 descending and abutting the top of the cutting disc 401, multiple chip removal blocks 40 3 is pushed by the bottom end of the connecting shaft 2 and gradually enters the strip vertical groove 402 to complete the contraction. This contraction action can achieve the effect of avoiding affecting the discharge of waste chips when the drill bit 3 is working. Combining the above actions, it can be found that when the CNC machine tool controls the connecting shaft 2 to move downward, the airflow ejected from the air guide hole 205 will preferentially eject the waste chips in the drill hole upward, and the cutting disc 401 can continuously chop up the longer waste chips generated in the drill hole when the drill bit 3 is drilling, which is convenient for the airflow to eject them on the one hand, and avoids the entanglement of the waste chips on the other hand. Finally, the CNC machine tool controls the connecting shaft 2 to move upward again. At this time, the ejection of the chip removal block 403 can further discharge the waste chips remaining in the drill hole, and finally achieves the effect of cutting longer waste chips to avoid entanglement and quickly discharging the chopped waste chips.

[0037] Embodiment 3

[0038] Further supplement on the basis of Example 2, such as Figure 3-Figure 6During the up and down reciprocating motion of the piston shaft 203, when the piston shaft 203 rises to the specified area, that is, when it approaches to be parallel to the magnetic block 505 embedded in the cleaning block 503, the magnetic attraction of the magnetic ring 506 on the magnetic block 505 is the largest, which will attract the magnetic block 505 to approach the surface of the connecting shaft 2 and drive the cleaning block 503 to approach the surface of the connecting shaft 2. When the shredded waste chips are taken out of the drill hole, some of them will accumulate near the drill hole and the connecting shaft 2, which may cause the drill bit 3 to be entangled with the rotating connecting shaft 2 during continuous rotation. Compared with the traditional CNC machine tool drill rod, which is easy to be entangled with the discharged waste chips, the present device utilizes the jet chip removal action triggered by the rising process of the piston shaft 203. The magnetic attraction of the magnetic ring 506 at the specified position on the magnetic block 505 makes the magnetic block 505 pre-blocked near the connecting shaft 2, and during the descending process of the piston shaft 203, the magnetic block 505 that loses the magnetic attraction of the magnetic ring 506 will follow the cleaning block 503, and pop outward under the stretching and resetting of the second spring 504, and pop out the waste chips accumulated near the drill hole, so as to clean the waste chips near the drill hole and reduce the risk of the waste chips being entangled with the connecting shaft 2. During this period, the magnetic-blocking sleeve 507 embedded in the bottom end of the connecting shaft 2 can quickly lose the magnetic attraction to the magnetic block 505 when the piston shaft 203 drives the magnetic ring 506 to descend, thereby assisting the magnetic block 505 and the cleaning block 503 to pop out quickly and clean the waste chips accumulated near the drill hole.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A CNC drilling machine tool, characterized in that: include: A mounting head (1) mounted on a CNC machine tool drive device, wherein a connecting shaft (2) for cleaning waste chips is mounted at the bottom of the mounting head (1), and a sealing chamber (201) and a piston chamber (202) are respectively provided in the connecting shaft (2), and the sealing chamber (201) is located above the piston chamber (202); A piston shaft (203), wherein a piston at the top of the piston shaft (203) is connected to the piston chamber (202), and a drill bit (3) for drilling a hole is fixedly mounted at the bottom; a first spring (204), the first spring (204) being fixedly connected between the top end of the piston shaft (203) and the inner wall of the piston chamber (202), and being used to assist the piston shaft (203) in performing up and down reciprocating motion; An air guide hole (205), the air guide hole (205) being formed at the bottom of the inner wall of the sealed cavity (201) and penetrating downward through the bottom end of the connecting shaft (2), and being used for air jetting and removing chips from the bottom of the drill hole; A three-way pipe (207), the bottom end of which is connected to the bottom of the inner wall of the sealed cavity (201) and is provided with a second one-way valve (209); both ends of the three-way pipe (207) penetrate the inner wall of the sealed cavity (201) in a transverse direction; the bottom of the inner wall of the sealed cavity (201) is connected to the first one-way valve (208); the first one-way valve (208) and the three-way pipe (207) are both connected to the piston cavity (202); A cutting assembly (4) is provided at the bottom end of the piston shaft (203), the cutting assembly (4) comprising a cutting disc (401), the cutting disc (401) being sleeved and fixed on the piston shaft (203) near the drill bit (3), a strip-shaped vertical groove (402) is provided at the bottom end of the piston shaft (203), a chip removal block (403) for chip removal is rotatably connected to the top of the inner wall of the strip-shaped vertical groove (402), and a third spring (404) is fixedly connected between the chip removal block (403) and the strip-shaped vertical groove (402); there are a plurality of strip-shaped vertical grooves (402), chip removal blocks (403) and third springs (404), which are arranged in a corresponding annular pattern; A cleaning assembly (5) for cleaning waste chips accumulated near the drilling hole is arranged near the top of the connecting shaft (2), the cleaning assembly (5) comprising an external ring (501), the external ring (501) is sleeved on the connecting shaft (2) near the mounting head (1), a fixing block (502) is fixedly connected to the top of the external ring (501) and the outer arc surface of the connecting shaft (2), a cleaning block (503) is rotatably connected to the outer wall of the external ring (501), a second spring (504) is fixedly connected between the top of the cleaning block (503) and the outer wall of the connecting shaft (2), a magnetic block (505) is embeddedly installed on the cleaning block (503) relative to the bottom side wall of the connecting shaft (2), and a magnetic ring (506) with opposite magnetic properties to the magnetic block (505) is embeddedly sleeved near the top of the piston shaft (203); There are a plurality of the fixing block (502), the cleaning block (503), the second spring (504) and the magnetic block (505), which are correspondingly distributed in an annular manner on the outside of the connecting shaft (2).

2. A CNC drilling machine tool according to claim 1, characterized in that: An anti-collision block (206) is fixedly connected to the top of the inner wall of the piston chamber (202), and the anti-collision block (206) is located at the center of the first spring (204).

3. A CNC drilling machine tool according to claim 1, characterized in that: There are a plurality of air guide holes (205) which are distributed in an annular manner at the bottom of the inner wall of the sealed cavity (201); the top port diameter of the air guide hole (205) is larger than the bottom port diameter.

4. A CNC drilling machine tool according to claim 1, characterized in that: The connection shaft (2) is embedded with a magnetic blocking sleeve (507) near the bottom end thereof and is used to reduce the magnetic attraction of the magnetic ring (506) to the outside world.

5. A CNC drilling machine tool according to claim 4, characterized in that: The outer side angle of the cleaning block (503) is an obtuse angle, and the surface is smooth; the end of the cleaning block (503) above the rotation point remains parallel to the connecting shaft (2).

6. A CNC drilling machine tool according to claim 1, characterized in that: The maximum rising distance of the piston shaft (203) is the same as the distance between the upper surface of the piston shaft (203) and the lower surface of the anti-collision block (206) in a normal state.

7. A CNC drilling machine tool according to claim 1, characterized in that: The end diameter of the connecting shaft (2) is smaller than the end diameter of the drill bit (3).

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