Numerically controlled machine tool drive structure

Abstract

The application belongs to the field of numerical control machine tools, and particularly relates to a numerical control machine tool driving structure, which comprises a shell, a cooling oil circuit is arranged on the shell, a cavity is arranged on the shell, a main shaft is rotationally connected in the cavity, a broach rod is slidably connected to the middle part of the main shaft, an air inlet pipe is fixedly connected to one end of the cavity away from a broach barrel, an air outlet pipe is fixedly connected to one end of the cavity close to the broach barrel, a cold air gun is connected to the end of the air inlet pipe, and the cold air end of the cold air gun is connected with the air inlet pipe; the air inlet pipe, the air outlet pipe and the cold air gun are arranged, when in use, the external air pump delivers compressed air to the air inlet end of the cold air gun, so that the cold air end sprays cold air, the cold air enters the cavity through the air inlet pipe, the airflow flows along the cavity, and is discharged from the air outlet pipe, the cold air flowing in the shell is used to cool the air main shaft, so that the cooling effect in the electric main shaft is improved, and the influence of the thermal elongation of the main shaft on the machining precision is reduced.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tools, specifically a CNC machine tool drive structure. Background Technology

[0002] An electric spindle is a type of CNC machine tool drive structure. An electric spindle integrates the machine tool spindle and the spindle motor into one drive system. The stator and rotor of the spindle motor are directly installed inside the spindle assembly, eliminating the traditional gearbox transmission and realizing the integration and zero transmission of the spindle system.

[0003] In existing technologies, electric spindles mainly consist of an external housing, a spindle, a motor drive module, a tool changer module, and a cooling module. The motor drive module mainly consists of a rotating shaft mounted on the spindle and a stator mounted on the housing. The cooling module mainly consists of circulating oil circuits distributed on the housing, which circulate cooling oil outside the stator to remove the heat generated by the high-speed rotation of the spindle. The tool changer module is used to quickly and stably fix the tool. The tool changer module mainly consists of a drawbar, a drawbar cylinder, a drawbar cylinder, a drawbar seat, and a drawbar spring in the middle of the spindle. During tool changing, the tool is inserted into the middle of the drawbar cylinder. Then, the drawbar cylinder drives the drawbar to move, and the drawbar drives multiple drawbar seats to move, causing the multiple drawbar seats to be squeezed together and close to the center, fixing the tool by friction and applying a pulling force to the tool.

[0004] However, in the current technology, the heat of the central spindle is dissipated through metal heat transfer by circulating cooling oil outside the stator, which has a poor cooling effect on the spindle. Therefore, a CNC machine tool drive structure is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention proposes a CNC machine tool drive structure.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A CNC machine tool drive structure includes a housing with a cooling oil passage. A cavity is formed in the housing, and a spindle is rotatably connected within the cavity. A broach is slidably connected to the middle of the spindle, and a broach spring is mounted on the broach. A broach cylinder is fixedly connected to the end of the broach. Multiple broach seats are mounted on the end of the broach cylinder away from the broach. A rotor is fixedly connected to the spindle. A stator corresponding to the rotor is mounted on the inner wall of the cavity. An air inlet pipe is fixedly connected to the end of the cavity away from the broach cylinder, and an air outlet pipe is fixedly connected to the end of the cavity near the broach cylinder. A cooling air gun is connected to the end of the air inlet pipe, and the cooling air end of the cooling air gun is connected to the air inlet pipe. Cooling of the air spindle is achieved by the cooling air flowing inside the housing, thereby improving the cooling effect inside the electric spindle and reducing the impact of spindle thermal expansion on machining accuracy.

[0007] Preferably, a flow divider is fixed to the inner sidewalls at both ends of the cavity. The flow divider is located at both ends of the rotor, and the main shaft is located in the middle of the flow divider. Guide grooves are formed on both the outer and inner surfaces of the flow divider. The guide grooves are arc-shaped. During the cooling process, the airflow passes through the guide groove and is ejected in a spiral shape to contact the main shaft and the inner sidewall of the cavity. Therefore, the contact between the airflow and the sidewall of the cavity and the outside of the main shaft can be improved.

[0008] Preferably, a water hole is provided in the middle of the broach rod, the broach cylinder is a hollow structure, a sliding groove is provided on the broach rod, an air injection pipe is fixedly connected to the spindle, the bottom end of the air injection pipe is inserted into the sliding groove and slidably connected thereto, and a one-way valve is fixedly connected inside the air injection pipe. With the above configuration, liquid and metal debris on the broach holder can be cleaned, thereby reducing the residue of metal debris, thus reducing the wear on the broach holder and the impact on the tool fixing effect, thereby reducing the impact on machining accuracy.

[0009] Preferably, a support is fixedly connected to the inner wall of the cutter barrel, and a push rod is slidably connected to the middle of the support; one end of the push rod is fixedly connected to a guide seat, and the other end is a sealing seat, which is located inside the water hole and slidably connected to it; when the cutter is fixed, the sealing seat can block the air injection pipe, preventing airflow from entering the water hole; a return spring is fixedly connected to the side of the support near the guide seat. With the above configuration, the stability of water outlet at the center of the cutter can be improved.

[0010] Preferably, the guide seat has a groove, an annular elastic membrane is fixed to the inner wall of the groove, a counterweight is fixed to the inner wall of the annular elastic membrane, and an impeller is fixed to the push rod. The airflow can drive the impeller to rotate, causing the push rod and the guide seat to rotate, which opens the annular elastic membrane and reduces the gap between the annular elastic membrane and the cutter seat. The above arrangement makes it easier for the airflow to flow along the surface of the cutter seat, while increasing the pressure of the airflow, which facilitates cleaning and drying of the cutter seat.

[0011] Preferably, bearing seats are fixedly connected to both ends of the main shaft, and a support bearing is installed between the bearing seat and the inner wall of the cavity. An annular baffle is fixedly connected to the side of the bearing seat, and the annular baffle covers the side of the support bearing. A cooling groove is opened in the bearing seat, and heat exchange fins are fixedly connected to the cooling groove and the annular baffle. The heat exchange fins are used to cool the bearing seat, thereby assisting in cooling the support bearing.

[0012] Preferably, the air inlet of the air gun is fixedly connected to a condenser box, and the air inlet of the air gun is fixedly connected to multiple heat-conducting pipes. The multiple heat-conducting pipes are S-shaped and fixedly connected to the condenser box. The top end of the heat-conducting pipe is fixedly connected to the air inlet pipe. Multiple condensing fins are fixedly connected to the heat-conducting pipe and are located inside the condenser box. With the above arrangement, the humidity of the airflow can be reduced, thereby reducing corrosion of the electric spindle and reducing the impact on electrical insulation.

[0013] Preferably, a processing shell is fixedly connected to the bottom of the condenser, a motor is fixedly connected inside the processing shell, a switching disk is fixedly connected to the output end of the motor, the switching disk is rotatably connected inside the processing shell, and multiple filter elements that can filter airflow are installed on the switching disk. The air intake is filtered by the filter elements, thereby reducing the accumulation of external dust in the cavity inside the shell.

[0014] Preferably, the filter element includes a filter cartridge, with filter cotton fixed to both ends of the filter cartridge; the space between the two filter cottons is filled with water-absorbing resin.

[0015] Preferably, a baffle is fixedly connected to the inner wall of the processing shell, and the interior of the processing shell is divided into a drying chamber and a filtering chamber by the baffle. The baffle is fitted and sealed to the turntable. A drying tube is fixedly connected to the hot air end of the cold air gun. The bottom end of the drying tube is fixedly connected to the top of the drying chamber. The filtering chamber and the condensation box are connected. With the above configuration, the water-absorbing resin and filter cotton can be reused repeatedly.

[0016] The advantages of this invention are: 1. This invention, by setting up an air inlet pipe, an air outlet pipe, and a cooling air gun, allows for the following operation: an external air pump delivers compressed air into the air inlet of the cooling air gun. The cooling air gun, relying on its internal vortex tube, ejects cooling air from its cooling end. The cooling air output from the cooling air gun enters the interior of the air inlet pipe, then enters the cavity through the air inlet pipe. The airflow flows along the cavity and exits from the air outlet pipe. The cooling air flowing inside the housing cools the air spindle, thereby improving the cooling effect inside the electric spindle and reducing the impact of spindle thermal expansion on machining accuracy. 2. This invention, by setting up an air injection pipe, a one-way valve, and a sliding groove on the broach rod, blocks the air outlet when the tool is pulled out. Then, the air in the cavity enters the water hole through the air injection pipe and is sprayed out from the broach tube. This can clean the liquid and metal debris on the broach holder, thereby reducing the residue of metal debris, reducing wear on the broach holder, and reducing the impact on the tool fixing effect, thus reducing the impact on machining accuracy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic cross-sectional view of the housing structure of the present invention; Figure 3 This is a partial structural diagram of the drawbar of the present invention; Figure 4 This is a schematic diagram of the push rod structure of the present invention; Figure 5 This is a schematic diagram of the bearing housing and flow divider of the present invention; Figure 6 This is a schematic diagram of the condenser box structure of the present invention; Figure 7 This is a schematic diagram of the filter cartridge of the present invention.

[0019] In the diagram: 11. Housing; 12. Main shaft; 13. Rotor; 14. Stator; 15. Broach rod; 16. Inlet pipe; 17. Broach cylinder; 18. Broach holder; 19. Cold air gun; 191. Outlet pipe; 21. Flow divider; 22. Guide groove; 31. Air injection pipe; 32. Slide groove; 41. Support; 42. Push rod; 43. Guide seat; 44. Sealing seat; 51. Impeller; 52. Annular elastic membrane; 53. Counterweight; 61. Support bearing; 62. Bearing housing; 63. Annular baffle; 64. Heat exchange fins; 71. Condensation box; 72. Heat conduction pipe; 73. Condensation fins; 81. Motor; 82. Processing shell; 83. Switching plate; 91. Filter cartridge; 92. Water-absorbing resin; 93. Filter cotton; 101. Drying tube; 102. Baffle bar. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Specific implementation examples are given below.

[0022] Please see Figure 1-3 As shown, a CNC machine tool drive structure includes a housing 11 with a cooling oil passage. A cavity is formed in the housing 11, and a spindle 12 is rotatably connected within the cavity. A broach 15 is slidably connected to the middle of the spindle 12, and a broach spring is mounted on the broach 15. A broach cylinder 17 is fixedly connected to the end of the broach 15. Multiple broach seats 18 are mounted on the end of the broach cylinder 17 away from the broach 15. A rotor 13 is fixedly connected to the spindle 12. A stator 14 corresponding to the rotor 13 is mounted on the inner wall of the cavity. An air inlet pipe 16 is fixedly connected to the end of the cavity away from the broach cylinder 17, and a... An air outlet pipe 191 is connected to the air inlet pipe 16, and a cold air gun 19 is connected to the end of the air inlet pipe 16. The cold air end of the cold air gun 19 is connected to the air inlet pipe 16. In use, an external air pump delivers compressed air into the air inlet end of the cold air gun 19. The cold air gun 19 uses its internal vortex tube to spray cold air from its cold air end. The cold air output by the cold air gun 19 enters the interior of the air inlet pipe 16, and then enters the cavity through the air inlet pipe 16. The airflow flows along the cavity and is discharged from the air outlet pipe 191. The cold air flowing inside the housing 11 is used to cool the air spindle 12, thereby improving the cooling effect inside the electric spindle 12 and reducing the impact of thermal expansion of the spindle 12 on machining accuracy.

[0023] Furthermore, such as Figure 2 and5 As shown, a flow divider 21 is fixed to the inner sidewalls at both ends of the cavity. The flow divider 21 is located at both ends of the rotor 13, and the main shaft 12 is located in the middle of the flow divider 21. A guide groove 22 is provided on both the outer and inner surfaces of the flow divider 21. The guide groove 22 is arc-shaped. During the cooling process, the airflow passes through the guide groove 22 and is ejected in a spiral shape to contact the main shaft 12 and the inner sidewall of the cavity. In use, the flow divider 21 is used to guide the internal airflow. After the airflow passes through the guide groove 22, it is ejected in a spiral shape to contact the main shaft 12 and the inner sidewall of the cavity. If the airflow flows directly in a straight line, the airflow has less contact with the outside of the main shaft 12 and the inner wall of the air, which affects heat dissipation. Therefore, the contact between the airflow and the sidewall of the cavity and the outside of the main shaft 12 can be improved.

[0024] Furthermore, such as Figure 2-4 As shown, a water hole is provided in the middle of the cutter bar 15, the cutter tube 17 is a hollow structure, a sliding groove 32 is provided on the cutter bar 15, an air injection pipe 31 is fixedly connected to the main shaft 12, the bottom end of the air injection pipe 31 is inserted into the sliding groove 32 and slidably connected thereto, and a one-way valve is fixedly connected inside the air injection pipe 31.

[0025] In the existing technology, in order to realize the function of water outlet in the center of the tool, the baffle 15 has a water hole in the middle, the end of the water hole is connected to the corresponding pipe, and the side end of the tool has a tubular protrusion that can be inserted into the inside of the baffle 17 to connect the water hole with the tool. However, when changing the tool, metal chips and cooling water are easily adhered to the side wall of the baffle 18. These liquids and metal chips will affect the tool fixing effect of the baffle 18 and increase wear, especially when cutting oil is used. In this embodiment, when the tool is pulled out, the air outlet pipe 191 is blocked, and then the air in the cavity enters the water hole through the air injection pipe 31 and is then sprayed out from the broach cylinder 17. This can clean the liquid and metal debris on the broach holder 18, thereby reducing the residue of metal debris, thus reducing the wear on the broach holder 18 and the impact on the tool fixing effect, thereby reducing the impact on machining accuracy.

[0026] Furthermore, such as Figure 3-4As shown, a support 41 is fixedly connected to the inner wall of the cutter barrel 17, and a push rod 42 is slidably connected to the middle of the support 41. One end of the push rod 42 is fixedly connected to a guide seat 43, and the other end is a sealing seat 44. The sealing seat 44 is located inside the water hole and is slidably connected to it. When the cutter is fixed, the sealing seat 44 can block the air injection pipe 31, preventing airflow from entering the water hole. A return spring is fixedly connected to the side of the support 41 near the guide seat 43. When the cutter is inserted into the cutter holder 18, the cutter will push the guide seat 43, which in turn pushes the push rod 42 and the sealing seat 44 to move. The sealing seat 44 can block the air injection pipe 31, preventing airflow from entering the water hole and reducing the mixing of airflow and cooling water. This can improve the stability of water outlet at the center of the cutter. The return spring is used to reset the push rod 42 and the sealing seat 44.

[0027] Furthermore, such as Figure 3-4 As shown, the guide seat 43 has a groove, and an annular elastic membrane 52 is fixed to the inner wall of the groove. A counterweight 53 is fixed to the inner wall of the annular elastic membrane 52, and an impeller 51 is fixed to the push rod 42. The airflow can drive the impeller 51 to rotate, causing the push rod 42 and the guide seat 43 to rotate, thus opening the annular elastic membrane 52 and reducing the gap between the annular elastic membrane 52 and the cutter seat 18. During use, the airflow can drive the impeller 51 to rotate, causing the push rod 42 and the guide seat 43 to rotate. Then, under the action of centrifugal force, the annular elastic membrane 52 will open under the action of the counterweight 53, reducing the gap between the annular elastic membrane 52 and the cutter seat 18. This allows the airflow to flow more easily along the surface of the cutter seat 18, while increasing the pressure of the airflow, which facilitates cleaning and drying of the cutter seat 18.

[0028] Furthermore, such as Figure 2 and 5 As shown, bearing seats 62 are fixed to both ends of the main shaft 12. A support bearing 61 is installed between the bearing seat 62 and the inner wall of the cavity. An annular baffle 63 is fixed to the side of the bearing seat 62, and the annular baffle 63 shields the side of the support bearing 61. A cooling groove is provided inside the bearing seat 62, and heat exchange fins 64 are fixed to the cooling groove and the annular baffle 63. In use, the bearing seat 62 and the installed support bearing 61 can support the main shaft 12 and improve the stability during rotation. The support bearing 61 is coated with grease. After heat exchange in the electric main shaft 12, the heated airflow impacts the bearing, which can cause the grease to shift and age more easily. The annular baffle is used to shield the side of the bearing, the cooling groove is used for airflow to pass through, and the heat exchange fins 64 are used to cool the bearing seat 62, thereby assisting in cooling the support bearing 61.

[0029] Furthermore, such as Figure 1 and 6 As shown, a condenser box 71 is fixedly connected to the air inlet end of the air cooler 19. Multiple heat pipes 72 are fixedly connected to the air cooler end of the air cooler 19. These heat pipes 72 are S-shaped and fixedly connected to the condenser box 71. The top end of each heat pipe 72 is fixedly connected to the air inlet pipe 16. Multiple condenser fins 73 are fixedly connected to each heat pipe 72 and are located inside the condenser box 71. During operation, the cooling water sprayed during turning cools the tool and workpiece. The evaporation of the cooling water increases the humidity of the ambient air during machining. Injecting this humid air into the electric spindle 12 easily leads to… Corrosion can occur and affect the internal electrical insulation. During use, air pumped by an air pump is injected from the bottom of the condenser box 71. The airflow then passes through the condenser box 71 and is injected into the cold air gun 19. The low-temperature cold airflow is injected into the heat pipe 72, which circulates within the condenser box 71. The low temperature reduces the temperature on the condenser fins 73, causing moisture in the air to condense on the condenser fins 73. After passing through the heat pipe 72, the airflow is injected into the air inlet pipe 16. By using the above configuration, the humidity of the airflow can be reduced, thereby reducing corrosion of the electric spindle 12 and minimizing the impact on electrical insulation.

[0030] Furthermore, such as Figure 6-7 As shown, a processing shell 82 is fixedly connected to the bottom of the condenser 71, a motor 81 is fixedly connected inside the processing shell 82, a switching disk 83 is fixedly connected to the output end of the motor 81, the switching disk 83 is rotatably connected inside the processing shell 82, and multiple filter elements that can filter airflow are installed on the switching disk 83. During use, the air pump delivers air into the processing housing 82 through the opening at the bottom and then passes through the filter element for filtration. The switching disc 83 has multiple filter elements, and the operator can drive the switching disc 83 to rotate via the motor 81 to automatically switch between different filter elements. This makes it convenient for the operator to use and reduces downtime for replacing filter elements. Furthermore, since there is processing dust in the air of the processing center, the filter element filters the intake air, thereby reducing the accumulation of external dust in the cavity inside the housing 11. The filter element consists of an outer filter cartridge 91 and an inner filter cotton 93 and water-absorbing resin 92. The water-absorbing resin 92 is used to absorb water and reduce the humidity in the airflow, while the filter cotton 93 is used to filter out dust from the air.

[0031] Furthermore, such as Figure 6-7As shown, a baffle 102 is fixedly attached to the inner wall of the processing shell 82. The interior of the processing shell 82 is divided into a drying chamber and a filtering chamber by the baffle 102. The baffle 102 is sealed to the turntable. A drying tube 101 is fixedly attached to the hot air end of the cold air gun 19. The bottom end of the drying tube 101 is fixedly attached to the top of the drying chamber. The filtering chamber and the condenser box 71 are connected. In use, the baffle 102 divides the interior of the processing shell 82 into a drying chamber and a filtering chamber. Then, the hot air blown from the hot air end of the cold air gun 19 is injected into the drying chamber through the drying tube 101 to dry the filter cartridge 91 that rotates into the drying chamber, thereby drying the absorbent resin 92 and reducing the moisture content of the filter cotton 93. Therefore, the absorbent resin 92 and the filter cotton 93 can be reused.

[0032] Working principle: During use, an external air pump delivers compressed air into the air inlet of the air cooler 19. The air cooler 19, relying on its internal vortex tube, sprays out cold air from its air end. The cold air output by the air cooler 19 enters the interior of the air inlet pipe 16, and then enters the cavity through the air inlet pipe 16. The airflow flows along the cavity and is discharged from the air outlet pipe 191. The cold air flowing inside the housing 11 is used to cool the air spindle 12, thereby improving the cooling effect inside the electric spindle 12 and reducing the impact of thermal expansion of the spindle 12 on machining accuracy. The flow divider 21 is used to guide the internal airflow. After passing through the flow guide groove 22, the airflow will be ejected in a spiral shape and contact the main shaft 12 and the inner wall of the cavity. If the airflow flows directly in a straight line, the airflow will have less contact with the outside of the main shaft 12 and the inner wall of the air, which will affect heat dissipation. Therefore, the contact between the airflow and the cavity side wall and the outside of the main shaft 12 can be improved. The bearing seat 62 and the installed support bearing 61 can support the main shaft 12 and improve the stability during rotation. The support bearing 61 is coated with grease. After heat exchange in the electric main shaft 12, the heated airflow will impact the bearing, which will cause the grease to shift and age more easily. The annular retaining ring is used to shield the side of the bearing. The cooling groove is used for the airflow to pass through. The heat exchange fins 64 are used to cool the bearing seat 62, thereby assisting in the cooling of the support bearing 61. When the tool is pulled out, the vent pipe 191 is blocked, and the air in the cavity enters the water hole through the air injection pipe 31, and is then ejected from the broach cylinder 17. This cleans the liquid and metal debris on the broach holder 18, reducing metal debris residue and thus reducing wear on the broach holder 18 and the impact on tool retention, thereby reducing the impact on machining accuracy. When the tool is inserted into the broach holder 18, the tool pushes the guide seat 43, which in turn moves the push rod 42 and the sealing seat 44. The sealing seat 44 blocks the air injection pipe 31, preventing airflow from entering the water hole. To reduce the mixing of airflow and cooling water, the stability of water outlet at the center of the tool can be improved. The return spring is used to reset the push rod 42 and the sealing seat 44. During the flow of airflow, the flow of airflow can drive the impeller 51 to rotate, thereby causing the push rod 42 and the guide seat 43 to rotate. Then, under the action of centrifugal force, it will cause the annular elastic membrane 52 to open under the action of the counterweight 53, reducing the gap between the annular elastic membrane 52 and the baffle 18. This makes it easier for the airflow to flow along the surface of the baffle 18, while increasing the pressure of the airflow, which is convenient for cleaning and drying the baffle 18. In operation, air pumped by the air pump is injected from the bottom of the condenser 71. The airflow then passes through the condenser 71 and is injected into the cold air gun 19. The low-temperature cold airflow is injected into the heat pipe 72, which circulates within the condenser 71. The low temperature of the heat pipe 72 lowers the temperature of the condenser fins 73, causing moisture in the air to condense on the condenser fins 73. After passing through the heat pipe 72, the airflow is injected into the air inlet pipe 16. This configuration reduces the humidity of the airflow, thereby reducing corrosion of the electric spindle 12 and minimizing its impact on electrical insulation. The air pumped by the air pump enters through the opening at the bottom of the processing housing 82 and is then filtered through a filter. The switching disc 83 has multiple filters, which can be automatically switched by the operator using a motor 81. This facilitates operation. This reduces downtime for filter replacement. Since the machining center contains processing dust, the filter filters the intake air, reducing the accumulation of external dust in the cavity inside the housing 11. The filter consists of an external filter cartridge 91 and internal filter cotton 93 and absorbent resin 92. The absorbent resin 92 absorbs water, reducing humidity in the airflow, while the filter cotton 93 removes dust from the air. A baffle 102 divides the interior of the processing housing 82 into a drying chamber and a filtering chamber. Hot air from the hot air end of the cold air gun 19 is injected into the drying chamber through the drying pipe 101 to dry the filter cartridge 91 rotating into the drying chamber, thereby drying the absorbent resin 92 and reducing the moisture content of the filter cotton 93. This facilitates the reuse of the absorbent resin 92 and the filter cotton 93.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A CNC machine tool drive structure, comprising a housing (11), a cooling oil passage provided on the housing (11), a cavity provided in the housing (11), a spindle (12) rotatably connected in the cavity, a broach rod (15) slidably connected in the middle of the spindle (12), a broach spring installed on the broach rod (15), a broach cylinder (17) fixedly connected to the end of the broach rod (15), a plurality of broach seats (18) installed at the end of the broach cylinder (17) away from the broach rod (15), a rotor (13) fixedly connected to the spindle (12), and a stator (14) corresponding to the rotor (13) installed on the inner wall of the cavity, characterized in that: An air inlet pipe (16) is fixedly connected to one end of the cavity away from the cutter barrel (17), and an air outlet pipe (191) is fixedly connected to one end of the cavity near the cutter barrel (17). The end of the air inlet pipe (16) is connected to a cold air gun (19), and the cold air end of the cold air gun (19) is connected to the air inlet pipe (16). A water hole is provided in the middle of the pull rod (15), the pull tube (17) is hollow, a sliding groove (32) is provided on the pull rod (15), an air injection pipe (31) is fixedly connected to the main shaft (12), the bottom end of the air injection pipe (31) is inserted into the sliding groove (32) and slidably connected thereto, and a one-way valve is fixedly connected inside the air injection pipe (31); A support (41) is fixedly connected to the inner wall of the cutter tube (17), and a push rod (42) is slidably connected to the middle of the support (41); a guide seat (43) is fixedly connected to one end of the push rod (42), and a sealing seat (44) is fixedly connected to the other end. The sealing seat (44) is located inside the water hole and is slidably connected to it. When the tool is fixed, the sealing seat (44) can block the air injection pipe (31) so that the airflow cannot be injected into the water hole. The support (41) is fixed with a return spring on the side near the guide seat (43). The flow guide seat (43) has a groove, and an annular elastic membrane (52) is fixed to the inner wall of the groove. A counterweight (53) is fixed to the inner wall of the annular elastic membrane (52), and an impeller (51) is fixed to the push rod (42). The airflow can drive the impeller (51) to rotate, thereby causing the push rod (42) and the flow guide seat (43) to rotate, so that the annular elastic membrane (52) opens and the gap between the annular elastic membrane (52) and the broach seat (18) is reduced.

2. The CNC machine tool drive structure according to claim 1, characterized in that: A flow divider (21) is fixed to the inner sidewalls at both ends of the cavity. The flow divider (21) is located at both ends of the rotor (13). The main shaft (12) is located in the middle of the flow divider (21). A flow guide groove (22) is provided on both the outer and inner surfaces of the flow divider (21). The flow guide groove (22) is arc-shaped. During the cooling process, the airflow passes through the guide groove (22) and then spirals out to contact the main shaft (12) and the inner wall of the cavity.

3. The CNC machine tool drive structure according to claim 1, characterized in that: Both ends of the main shaft (12) are fixedly connected to bearing seats (62). A support bearing (61) is installed between the bearing seat (62) and the inner wall of the cavity. An annular baffle (63) is fixedly connected to the side of the bearing seat (62). The annular baffle (63) covers the side of the support bearing (61). A cooling groove is opened in the bearing seat (62). Heat exchange fins (64) are fixedly connected to the cooling groove and the annular baffle (63).

4. The CNC machine tool drive structure according to claim 1, characterized in that: The air inlet of the air gun (19) is fixedly connected to a condenser box (71). The air inlet of the air gun (19) is fixedly connected to a plurality of heat pipes (72). The plurality of heat pipes (72) are arranged in an S-shape and fixedly connected to the condenser box (71). The top of the heat pipes (72) is fixedly connected to the air inlet pipe (16). A plurality of condensing fins (73) are fixedly connected to the heat pipes (72). The plurality of condensing fins (73) are located inside the condenser box (71).

5. The CNC machine tool drive structure according to claim 4, characterized in that: The bottom of the condenser (71) is fixedly connected to a processing shell (82), and a motor (81) is fixedly connected inside the processing shell (82). A switching disk (83) is fixedly connected to the output end of the motor (81). The switching disk (83) is rotatably connected inside the processing shell (82). Multiple filters that can filter airflow are installed on the switching disk (83).

6. The CNC machine tool drive structure according to claim 5, characterized in that: The filter element includes a filter cartridge (91), and filter cotton (93) is fixed to both ends of the filter cartridge (91); water-absorbing resin (92) is filled between the two filter cottons (93).

7. A CNC machine tool drive structure according to claim 5, characterized in that: A baffle (102) is fixedly connected to the inner wall of the processing shell (82). The interior of the processing shell (82) is divided into a drying chamber and a filtering chamber by the baffle (102). The baffle (102) is in close contact with the switching plate (83) and sealed. A drying tube (101) is fixedly connected to the hot air end of the cold air gun (19). The bottom end of the drying tube (101) is fixedly connected to the top of the drying chamber. The filtering chamber and the condenser box (71) are connected.

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