A main shaft with a built-in center water outlet mechanism

Abstract

The application discloses a main shaft with a built-in center water outlet mechanism, which comprises a steel cylinder, front and rear bearing seats fixed at two ends of the steel cylinder respectively, a rotor arranged in the steel cylinder, a hollow pull rod arranged in the rotor, a tool handle connected with the pull rod and arranged at the front end of the rotor, a tool handle water channel formed in the tool handle, a rear cover fixed at the upper end of a rear bearing assembly, the upper end of the rotor being arranged in the rear cover, an oil cylinder seat fixed at the upper end of the rear cover, an oil cylinder arranged in the oil cylinder seat and capable of sliding up and down, a piston arranged in the oil cylinder, a piston rod arranged at the center of the piston, the upper end of the pull rod penetrating through the piston rod, a tail cover fixed at the upper end of the oil cylinder seat, a water inlet channel formed in the tail cover, a rotary joint assembly arranged in the tail cover and between the water inlet channel and the upper end of the pull rod. The rotary joint assembly can be integrated in the main shaft, stress of the rotary joint assembly can be avoided, and the overall performance of the main shaft is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a spindle, in particular to a spindle with a built-in center water outlet mechanism. BACKGROUND

[0002] In the current field of spindle equipment, in order to reduce the interference position within the limited stroke of the machine tool, so as to process larger size parts, it is generally required that the spindle has a center water outlet function, but the rotary joint in the existing center water outlet spindle is generally exposed externally. For related mechanisms, please refer to the Chinese patent publication document with publication number CN210789254U and the name "Middle hole water-cooled high-speed electric spindle rotary joint support structure", which records:

[0003] "The support sleeve 3 is fixedly connected to the cylinder shell at the rear of the electric spindle, the rear end face of the support sleeve has a mounting circular hole 32, the diameter of the mounting circular hole is greater than the diameter of the rotary joint 4, two sealing ring grooves are provided in the hole, and a sealing ring is installed in each sealing ring groove, the rotary joint and the sealing ring are in interference fit, and the drain port 5 on the rotary joint is located outside the support sleeve".

[0004] In such mechanisms, the rotary joint is exposed to the outside of the spindle, which not only causes the spindle shaft to be longer, making it difficult to match with existing machine tools, but also bears some stress during use. Under the condition of long-term application, it is easy to cause cooling liquid leakage and other situations. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a spindle with a built-in center water outlet mechanism, which can integrate the rotary joint assembly inside the spindle, avoid stress on the rotary joint assembly, and improve the overall performance of the spindle.

[0006] To solve the above technical problems, the present application adopts the following technical solutions.

[0007] A main shaft with a built-in center water outlet mechanism, comprising a steel cylinder, a front bearing seat and a rear bearing seat fixed at both ends of the steel cylinder respectively, a front bearing assembly arranged in the front bearing seat, a rear bearing assembly arranged in the rear bearing seat, a rotor arranged in the steel cylinder, both ends of the rotor penetrating through the front bearing assembly and the rear bearing assembly respectively, a hollow pull rod arranged in the rotor, a tool holder arranged at the front end of the rotor and connected with the pull rod, a tool holder water channel arranged in the tool holder, a rear cover fixed at the upper end of the rear bearing assembly, the upper end of the rotor being located in the rear cover, an oil cylinder seat fixed at the upper end of the rear cover, an oil cylinder arranged in the oil cylinder seat and capable of sliding up and down, a piston arranged in the oil cylinder, a piston rod arranged at the center of the piston, the upper end of the pull rod penetrating through the piston rod, a tail cover fixed at the upper end of the oil cylinder seat, a water inlet channel arranged in the tail cover, a rotary joint assembly arranged in the tail cover, the rotary joint assembly being arranged between the water inlet channel and the upper end of the pull rod, when the hydraulic oil injected into the oil cylinder drives the piston and the pull rod to move upward, the rotary joint assembly is communicated between the water inlet channel and the upper end of the pull rod, and the cooling water injected into the water inlet channel is sequentially transported through the water inlet channel, the rotary joint assembly, the pull rod and the tool holder water channel.

[0008] Preferably, an oil cylinder cover is fixed at the upper end of the oil cylinder, and the piston is arranged in a hydraulic cavity formed by the oil cylinder cover and the oil cylinder.

[0009] Preferably, a tool loosening limiting disc and a tool loosening dragging disc are arranged at the front side of the oil cylinder, the tool loosening dragging disc is fixedly connected with the lower end of the oil cylinder, the tool loosening limiting disc is fixedly connected with the upper end of the rotor, an inner ring end of the tool loosening dragging disc is formed with a locking ring, the locking ring is located below the tool loosening limiting disc, when the main shaft performs a tool loosening action, hydraulic oil is injected into the upper cavity of the piston to drive the piston and the pull rod to move downward, under the action of the reaction force of the hydraulic oil, the oil cylinder and the tool loosening dragging disc are pushed to rise until the locking ring and the tool loosening limiting disc are locked with each other, when the main shaft performs a tool clamping action, hydraulic oil is injected into the lower cavity of the piston to drive the piston and the pull rod to move upward, under the action of the reaction force of the hydraulic oil, the oil cylinder and the tool loosening dragging disc are pushed to descend until the tool loosening dragging disc and the tool loosening limiting disc are separated.

[0010] Preferably, a first hydraulic joint and a second hydraulic joint are fixed at the upper end of the rear cover, the first hydraulic joint is communicated with the upper cavity of the piston, and the second hydraulic joint is communicated with the lower cavity of the piston.

[0011] Preferably, the lower end of the front bearing seat is fixed with a front bearing pressing plate, the lower end of the front bearing pressing plate is fixed with a dust ring, the lower end of the dust ring is fixed with a ring spray plate, the outer side of the rotor is fixed with a rotor outer sleeve and a front waterproof cover, the first gap is formed between the rotor outer sleeve and the front bearing pressing plate, the dust ring and the ring spray plate, the front waterproof cover is located below the rotor outer sleeve, the air seal gap is formed between the front waterproof cover and the ring spray plate, the air seal air channel is sequentially communicated in the rear cover, the steel cylinder, the front bearing seat, the front bearing pressing plate and the dust ring, the air channel joint is arranged at the upper end of the rear cover, the air channel joint, the air seal air channel, the first gap and the air seal gap are sequentially communicated, and the airflow injected by the air channel joint is discharged through the air seal gap and forms an annular air seal.

[0012] Preferably, the lower end edge of the ring spray plate is formed with an annular gas storage pressure stabilizing cavity, the annular gas storage pressure stabilizing cavity is communicated with the air seal air channel, and the lower end surface of the ring spray plate is provided with a gas passing groove, the gas passing groove is communicated between the annular gas storage pressure stabilizing cavity and the first gap.

[0013] Preferably, the lower end surface of the ring spray plate is provided with a plurality of gas passing grooves, and the plurality of gas passing grooves are uniformly distributed along the circumference of the ring spray plate.

[0014] Preferably, the side of the rear cover is provided with an adjusting hole, the rear cover is provided with a dynamic balance adjusting ring, the dynamic balance adjusting ring is sleeved on the rotor and fixedly connected with the rotor, the outer side of the dynamic balance adjusting ring is provided with an adjusting screw hole, and the adjusting screw hole is arranged in alignment with the adjusting hole.

[0015] Preferably, the rotor is fixed with a rotor core, a front balance ring and a rear balance ring, and the front balance ring and the rear balance ring are arranged at two ends of the rotor core.

[0016] Preferably, four magnetic guide notches are arranged in the rotor core, and a plurality of magnetic steel sheets are embedded in the rotor core between adjacent two magnetic guide notches.

[0017] The main shaft of the built-in center water outlet mechanism is characterized in that the bearing assembly at the front and rear ends of the steel cylinder, the rotor, the pull rod and the oil cylinder assembly form the basic structure of the main shaft, the tail cover is fixed to the upper end of the oil cylinder seat, the rotary joint assembly is built in the tail cover, the water inlet channel is arranged in the tail cover, when the main shaft performs the clamping cutter action, the piston and the pull rod move upward and connect the rotary joint assembly between the water inlet channel and the upper end of the pull rod, at this time, the cooling water injected through the water inlet channel is sequentially discharged outward through the water inlet channel, the rotary joint assembly, the pull rod and the cutter handle water channel, thereby realizing the water cooling function of the cutter handle and the cutter head part. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a sectional view of the main shaft Figure 1 ;

[0019] Figure 2 is a sectional view of the main shaft Figure 2 ;

[0020] Figure 3 is a sectional view of the rear end of the main shaft Figure 1 ;

[0021] Figure 4 is a structure diagram of the rotor

[0022] Figure 5 is a sectional view of the rotor

[0023] Figure 6 is a structure diagram of the ring spray plate

[0024] Figure 7 is a sectional view of the rear end of the main shaft Figure 2 ;

[0025] Figure 8 is a sectional view of the rear end of the main shaft Figure 3 ;

[0026] Figure 9 is a structure diagram of the water blocking ring

[0027] Figure 10 is a sectional view of the water blocking ring

[0028] Figure 11 is a structure diagram of the rear waterproof cover

[0029] Figure 12 is a sectional view of the rear waterproof cover

[0030] Figure 13 Structure diagram of water blocking seal ring;

[0031] Figure 14 Structure diagram of annular tablet. DETAILED DESCRIPTION

[0032] The application will be described in more detail below with reference to the drawings and embodiments.

[0033] Embodiment one

[0034] The embodiment proposes a main shaft with a built-in center water outlet mechanism, which is combined with a Figures 1 to 6 As shown in the figure, it comprises a steel cylinder 1, the two ends of which are fixed with a front bearing seat 2 and a rear bearing seat 3, respectively, the front bearing seat 2 is provided with a front bearing assembly 20, the rear bearing seat 3 is provided with a rear bearing assembly 30, the steel cylinder 1 is provided with a rotor 4, the two ends of which pass through the front bearing assembly 20 and the rear bearing assembly 30, respectively, the rotor 4 is provided with a hollow pull rod 7, the front end of the rotor 4 is provided with a tool handle 70 connected with the pull rod 7, the tool handle 70 is provided with a tool handle water channel 71, the upper end of the rear bearing assembly 30 is fixed with a rear cover 9, the upper end of the rotor 4 is located in the rear cover 9, the upper end of the rear cover 9 is fixed with an oil cylinder seat 8, the oil cylinder seat 8 is provided with an oil cylinder 83 which can slide up and down, the oil cylinder 83 is provided with a piston 80, the center of the piston 80 is provided with a piston rod 800, the upper end of the pull rod 7 passes through the piston rod 800, the upper end of the oil cylinder seat 8 is fixed with a tail cover 6, the tail cover 6 is provided with a water inlet channel 63, the tail cover 6 is provided with a rotary joint assembly 69, which is located between the water inlet channel 63 and the upper end of the pull rod 7, when the hydraulic oil injected into the oil cylinder 83 drives the piston 80 and the pull rod 7 to move upward, the rotary joint assembly 69 is connected between the water inlet channel 63 and the upper end of the pull rod 7, the cooling water injected into the water inlet channel 63 is transported in sequence through the water inlet channel 63, the rotary joint assembly 69, the pull rod 7 and the tool handle water channel 71.

[0035] In the structure, the bearing assembly at the front and back ends of the steel cylinder 1, the rotor 4, the pull rod 7 and the oil cylinder assembly form the basic structure of the main shaft, and the tail cover 6 is fixed to the upper end of the oil cylinder seat 8, the rotary joint assembly 69 is arranged in the tail cover 6, the water inlet channel 63 is arranged in the tail cover 6, and when the main shaft performs the clamping cutter action, the piston 80 and the pull rod 7 move upward and connect the rotary joint assembly 69 between the water inlet channel 63 and the upper end of the pull rod 7, at this time, the cooling water injected through the water inlet channel 63 is sequentially discharged outward through the water inlet channel 63, the rotary joint assembly 69, the pull rod 7 and the cutter handle water channel 71, and the water cooling function of the cutter handle 70 and the cutter head part is realized. Compared with the prior art, the center water outlet cooling function is realized, the rotary joint assembly is integrated in the main shaft by arranging the rotary joint assembly 69 in the tail cover 6, the stress of the rotary joint assembly in use is avoided, and the overall performance of the main shaft is improved.

[0036] Regarding the specific structure of the oil cylinder assembly, in the embodiment, the upper end of the oil cylinder 83 is fixed with an oil cylinder cover 830, and the piston 80 is arranged in the hydraulic cavity formed by the oil cylinder cover 830 and the oil cylinder 83. Further, the upper end of the rear cover 9 is fixed with a first hydraulic joint 91 and a second hydraulic joint 92, the first hydraulic joint 91 is connected with the upper cavity of the piston 80, and the second hydraulic joint 92 is connected with the lower cavity of the piston 80.

[0037] Combining Figure 1 And Figure 3 As shown in the drawings, the embodiment also has the functions of loosening the cutter and automatically locking the rotor, specifically, the front side of the oil cylinder 83 is provided with a cutter loosening limiting disc 81 and a cutter loosening dragging disc 82, the cutter loosening dragging disc 82 is fixedly connected with the lower end of the oil cylinder 83, the cutter loosening limiting disc 81 is fixedly connected with the upper end of the rotor 4, the inner ring end of the cutter loosening dragging disc 82 is formed with a locking ring 820, the locking ring 820 is located below the cutter loosening limiting disc 81, when the main shaft performs the cutter loosening action, hydraulic oil is injected into the upper cavity of the piston 80 to drive the piston 80 and the pull rod 7 to move downward, under the action of the reaction force of the hydraulic oil, the oil cylinder 83 and the cutter loosening dragging disc 82 are pushed to rise until the locking ring 820 and the cutter loosening limiting disc 81 are locked, when the main shaft performs the cutter clamping action, hydraulic oil is injected into the lower cavity of the piston 80 to drive the piston 80 and the pull rod 7 to move upward, under the action of the reaction force of the hydraulic oil, the oil cylinder 83 and the cutter loosening dragging disc 82 are pushed to descend until the cutter loosening dragging disc 82 and the cutter loosening limiting disc 81 are separated.

[0038] In the structure, the lower end of the oil cylinder 83 is fixedly provided with the loose tool dragging disc 82 capable of being locked and matched with the loose tool limiting disc 81. When the user needs to change the tool, the loose tool action is performed on the main shaft. The hydraulic oil is injected into the upper cavity of the piston 80 through the hydraulic source. The piston 80 and the pull rod 7 are driven to move downward under the action of the hydraulic oil pressure. Because of the reaction force of the hydraulic oil, the oil cylinder 83 and the loose tool dragging disc 82 are pushed upward. Finally, the locking ring 820 is locked with the loose tool limiting disc 81, so that the rotor 4 cannot rotate. In addition, when the tool changing is completed and the main shaft needs to perform the tool clamping action, the hydraulic oil can be injected into the lower cavity of the piston 80 through the hydraulic source. At this time, the piston 80 and the pull rod 7 can be driven to move upward. The reaction force of the hydraulic oil pushes the oil cylinder 83 and the loose tool dragging disc 82 to descend, so that the loose tool dragging disc 82 is separated from the loose tool limiting disc 81. At this time, the rotor 4 can automatically rotate and enter the working state. Based on the above principle, the automatic locking and automatic opening functions of the rotor 4 in the loose tool and clamping tool processes are realized. Not only the reliability of the tool changing process is improved, but also the stress of the bearings at the front and rear ends of the rotor 4 is avoided.

[0039] In combination with Figure 1 and Figure 3 As shown in the drawings, the rotary joint assembly 69 in the embodiment includes a rotary joint stator 60 and a rotary joint rotor 61. The rotary joint rotor 61 is fixed to the upper end of the pull rod 7 and communicates with each other. The rotary joint stator 60 is located above the rotary joint rotor 61. The movable pipe 62 capable of sliding up and down is arranged in the rotary joint stator 60. The water inlet channel 63 communicating with the upper end of the rotary joint stator 60 is arranged in the tail cover 6.

[0040] In combination with Figure 1 and Figure 2As shown, in order to form a ring-shaped air seal at the front end of the main shaft, in the embodiment, the lower end of the front bearing seat 2 is fixed with a front bearing pressing plate 10, the lower end of the front bearing pressing plate 10 is fixed with a dust ring 11, the lower end of the dust ring 11 is fixed with a ring spray plate 12, the outer side of the rotor 4 is fixed with a rotor outer sleeve 13 and a front waterproof cover 15, a first gap 14 is formed between the rotor outer sleeve 13 and the front bearing pressing plate 10, the dust ring 11 and the ring spray plate 12, the front waterproof cover 15 is located below the rotor outer sleeve 13, an air seal gap 16 is formed between the front waterproof cover 15 and the ring spray plate 12, the rear cover 9, the steel cylinder 1, the front bearing seat 2, the front bearing pressing plate 10 and the dust ring 11 are provided with an air seal air channel 17 which communicates sequentially, the upper end of the rear cover 9 is provided with an air channel joint 93, the air channel joint 93, the air seal air channel 17, the first gap 14 and the air seal gap 16 communicate sequentially, and the airflow injected by the air channel joint 93 passes through the air seal gap 16 and forms a ring-shaped air seal.

[0041] In order to facilitate the airflow into the first gap 14, in the embodiment, a ring-shaped gas storage and pressure stabilization chamber 120 is formed at the lower end edge of the ring spray plate 12, the ring-shaped gas storage and pressure stabilization chamber 120 communicates with the air seal air channel 17, and a gas passing groove 121 is formed in the lower end surface of the ring spray plate 12 and communicates between the ring-shaped gas storage and pressure stabilization chamber 120 and the first gap 14.

[0042] Please refer to Figure 6 In order to ensure uniform distribution of airflow, in the embodiment, a plurality of gas passing grooves 121 are formed in the lower end surface of the ring spray plate 12 and are uniformly distributed along the circumference of the ring spray plate 12.

[0043] As a preferred mode, the side of the rear cover 9 is provided with an adjusting hole 94, the rear cover 9 is provided with a dynamic balance adjusting ring 95, the dynamic balance adjusting ring 95 is sleeved on the rotor 4 and fixedly connected thereto, the outer side of the dynamic balance adjusting ring 95 is provided with an adjusting screw hole 96, and the adjusting screw hole 96 is arranged in alignment with the adjusting hole 94. In the embodiment, by arranging the adjusting hole 94, the user can directly screw the dynamic balance adjusting screw in the adjusting screw hole 96 from the outside without disassembling the main shaft, which not only facilitates the debugging work, but also avoids the adverse effects caused by repeated disassembly and assembly.

[0044] Combined with Figure 4 and Figure 5As shown, regarding the preferred configuration of the rotor 4, in the present embodiment, the rotor 4 is fixed with a rotor core 40, a front balance ring 41 and a rear balance ring 42, which are respectively arranged at the two ends of the rotor core 40. Further, four magnetic guide slots 43 are arranged in the rotor core 40, and a plurality of magnetic steel sheets 44 are arranged in the rotor core 40 between two adjacent magnetic guide slots 43.

[0045] Embodiment two

[0046] In practical application, for the main shaft with a rotary joint at the rear end, under long-term use condition, the rotary joint is prone to have cooling liquid seepage at the periphery, which will result in that the rotary joint cannot be installed in the main shaft. Therefore, how to avoid the cooling liquid seepage of the rotary joint from affecting the performance of the main shaft is a technical problem to be solved in the prior art.

[0047] To this end, the present embodiment provides a center water outlet mechanism which can timely discharge the cooling liquid seepage of the rotary joint, and is conducive to the built-in installation of the rotary joint in the main shaft. Figure 1 、 Figure 2 、 Figure 3 、 Figures 7 to 14 As shown, the main shaft comprises a tail cover 6 and a pull rod 7, the upper end of the pull rod 7 extends into the tail cover 6, the center water outlet mechanism comprises a rotary joint stator 60 and a rotary joint rotor 61, the rotary joint rotor 61 is fixed to the upper end of the pull rod 7 and communicates with each other, the rotary joint stator 60 is located above the rotary joint rotor 61, a movable pipe 62 which can slide up and down is arranged in the rotary joint stator 60, the tail cover 6 is provided with a water inlet channel 63 which communicates with the upper end of the rotary joint stator 60, the tail cover 6 is fixed with a water blocking ring 64, the water blocking ring 64 is sleeved on the outer side of the pull rod 7 and rotates with the pull rod 7, a plurality of lateral drainage holes 640 are arranged in the side wall of the water blocking ring 64, an outer water collecting groove 641 is arranged in the outer side wall of the water blocking ring 64, the lateral drainage holes 640 communicate with the outer water collecting groove 641, a drainage channel 600 which communicates with the outer water collecting groove 641 is arranged in the side wall of the tail cover 6, when the pull rod 7 moves upward and the water inlet channel 63 is filled with water, under the action of water pressure and the jacking of the pull rod 7, the lower end of the movable pipe 62 abuts and communicates with the upper end of the rotary joint rotor 61, the water leaked from the connection between the movable pipe 62 and the rotary joint rotor 61 is sequentially discharged outward through the lateral drainage holes 640, the outer water collecting groove 641 and the drainage channel 600.

[0048] In the structure, the rotary joint stator 60 and the rotary joint rotor 61 form a rotary joint assembly embedded in the tail cover 6. When the main shaft performs the clamping action, the pull rod 7 and the rotary joint rotor 61 are driven to move upward under the action of the main shaft oil cylinder. At the same time, water pressure is generated when water is injected into the water inlet channel 63. Under the action of the water injection pressure, the movable pipe 62 is driven to move downward. At this time, the lower end of the movable pipe 62 abuts against the upper end of the rotary joint rotor 61, and the movable pipe 62 and the rotary joint rotor 61 are in communication with each other. The water inlet channel 63 can inject water through the tool handle at the forward end of the pull rod 7, thereby realizing the water cooling function. In the above action process, the water leakage at the connection between the movable pipe 62 and the rotary joint rotor 61 can be sequentially discharged outward through the lateral drainage hole 640, the outer water collecting groove 641 and the drainage channel 600 due to the arrangement of the water blocking ring 64. Compared with the prior art, the cooling water leaked from the rotary joint can be discharged in time, the performance of the main shaft can be effectively avoided from being affected by the cooling water leaked from the rotary joint, and the application requirements are better met.

[0049] In order to realize the sealing connection with the upper end of the rotary joint rotor 61, in the embodiment, the lower end of the movable pipe 62 is provided with a sealing rubber ring 620 for abutting and cooperating with the upper end of the rotary joint rotor 61.

[0050] In combination with Figure 9 and Figure 10 shown, the embodiment is provided with an inner water collecting groove corresponding to the outer water collecting groove 641 on the inner side of the water blocking ring 64. Specifically, the inner water collecting groove 642 is formed in the inner side wall of the water blocking ring 64, and the lateral drainage hole 640 is communicated with the inner water collecting groove 642.

[0051] In the structure, the embodiment is provided with water collecting grooves on both the inner and outer sides of the water blocking ring 64, which is helpful for timely collecting and discharging the cooling water leaked from the rotary joint.

[0052] In order to further improve the water blocking effect, in the embodiment, the lower end of the water blocking ring 64 is formed with an upwardly bent inner edge 643, and a narrow gap is formed between the inner edge 643 and the pull rod 7.

[0053] Please refer to Figure 8 As a preferred way, the embodiment is preferably provided with a waterproof measure between the tail cover 6 and the pull rod 7. Specifically, a rear waterproof cover 65 is sealingly fixed to the position close to the lower end on the inner side of the tail cover 6. The inner ring end of the rear waterproof cover 65 is fixed with a water blocking sealing ring 66, and the pull rod 7 penetrates through the water blocking sealing ring 66 and the two are in rotary cooperation.

[0054] Further, the inner ring end of the water blocking seal ring 66 is formed with a conical flange 660 protruding upward, which is sleeved on the outer side of the pull rod 7. Under the action of the conical flange 660, water infiltrating into the tail cover 6 can be better blocked, so that the cooling water cannot enter the main shaft along the pull rod 7.

[0055] In order to more reliably fix the water blocking seal ring 66, in the embodiment, the rear waterproof cover 65 is fixed with an annular pressing piece 67, and the outer ring end of the water blocking seal ring 66 is pressed between the annular pressing piece 67 and the rear waterproof cover 65. Further, the annular pressing piece 67 is formed with a plurality of fan-shaped pressing tables 670 protruding towards one side of the water blocking seal ring 66, which press the outer ring end of the water blocking seal ring 66.

[0056] In the above structure, under the action of the plurality of fan-shaped pressing tables 670 on the annular pressing piece 67, the outer ring end of the water blocking seal ring 66 can be reliably pressed, so that the water blocking seal ring 66 is well matched with the pull rod 7.

[0057] In order to timely drain the cooling water infiltrating into the inner cavity of the tail cover 6, in the embodiment, the inner side wall of the tail cover 6 is provided with an inner cavity drain port 601 communicating with the drain channel 600, and the inner cavity drain port 601 is arranged adjacent to the rear end surface of the rear waterproof cover 65.

[0058] On this basis, please refer to Figure 3 , the lower end of the tail cover 6 is fixedly connected with an oil cylinder seat 8, the oil cylinder seat 8 is provided with an oil cylinder 83, the oil cylinder 83 is provided with a piston 80, the pull rod 7 passes through the piston rod 800 of the piston 80, and an annular air channel 801 is formed between the pull rod 7 and the piston rod 800, the front side of the oil cylinder 83 is provided with a knife loosening limiting disc 81 and a knife loosening trailing disc 82, the knife loosening trailing disc 82 is located outside the knife loosening limiting disc 81 and an avoidance gap 802 is formed between the two, the lower end of the oil cylinder seat 8 is fixedly connected with a rear cover 9, the sidewall of the rear cover 9 is provided with a gas seal channel 90, the gas seal channel 90, the inner cavity of the rear cover 9, the avoidance gap 802 and the annular air channel 801 are sequentially communicated, when the gas seal channel 90 is injected with gas flow, the gas flow sequentially passes through the gas seal channel 90, the inner cavity of the rear cover 9, the avoidance gap 802, the annular air channel 801 and the inner side of the water blocking seal ring 66, and forms a gas seal at the connection between the pull rod 7 and the water blocking seal ring 66.

[0059] In the above structure, when the main shaft is clamped with a tool and enters a working state, a gas flow can be injected into the gas seal passage 90, which is transmitted in sequence through the gas seal passage 90, the inner cavity of the rear cover 9, the avoidance gap 802, the annular gas channel 801 and the water blocking seal ring 66, and forms a ring-shaped gas seal between the inner side of the water blocking seal ring 66 and the pull rod 7, which prevents water that has penetrated into the rear cover 9 from entering the interior of the main shaft along the pull rod 7, thereby playing a further role of gas seal and water blocking, and significantly improving the water blocking characteristics of the main shaft.

[0060] The above description is only the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement or improvement within the technical scope of the present application shall be included in the protection scope of the present application.

Claims

1. A spindle with a built-in center water outlet mechanism, characterized in that, The utility model provides a kind of cutting machine, including steel cylinder (1), the front bearing seat (2) and rear bearing seat (3) are respectively fixed in both ends of the steel cylinder (1), the front bearing assembly (20) is equipped in the front bearing seat (2), the rear bearing assembly (30) is equipped in the rear bearing seat (3), the rotor (4) is equipped in the steel cylinder (1), the rotor (4) two ends respectively pass through the front bearing assembly (20) and the rear bearing assembly (30), the hollow pull rod (7) is equipped in the rotor (4), the front end of the rotor (4) is equipped with the handle (70) connected with the pull rod (7), the handle waterway (71) is opened in the handle (70), the upper end of the rear bearing assembly (30) is fixed with rear cover (9), the upper end of the rotor (4) is located in the rear cover (9), the upper end of the rear cover (9) is fixed with oil cylinder seat (8), the oil cylinder (83) capable of sliding up and down is equipped in the oil cylinder seat (8), the piston (80) is equipped in the oil cylinder (83), the center of the piston (80) is equipped with piston rod (800), the upper end of the pull rod (7) passes through the piston rod (800), the upper end of the oil cylinder seat (8) is fixed with tail cover (6), the water inlet passage (63) is opened in the tail cover (6), the rotary joint assembly (69) is equipped in the tail cover (6), the rotary joint assembly (69) is located between the water inlet passage (63) and the upper end of the pull rod (7), when the hydraulic oil injected in the oil cylinder (83) drives the piston (80) and the pull rod (7) upward movement, the rotary joint assembly (69) is communicated between the water inlet passage (63) and the upper end of the pull rod (7), the cooling water injected in the water inlet passage (63) is sequentially transported via the water inlet passage (63), the rotary joint assembly (69), the pull rod (7) and the handle waterway (71); The upper end of the oil cylinder (83) is fixed with oil cylinder cover (830), and the piston (80) is arranged in the hydraulic cavity formed by the oil cylinder cover (830) and the oil cylinder (83) The front side of the oil cylinder (83) is provided with a loose knife limiting disc (81) and a loose knife dragging disc (82), the lower end of the loose knife dragging disc (82) is fixedly connected with the oil cylinder (83), the upper end of the rotor (4) is fixedly connected with the loose knife limiting disc (81), the inner ring end of the loose knife dragging disc (82) is formed with a locking ring (820), the locking ring (820) is located below the loose knife limiting disc (81), when the main shaft performs a loose knife action, hydraulic oil is injected into the upper cavity of the piston (80) to drive the piston (80) and the pull rod (7) to move downward, under the action of the reaction force of the hydraulic oil, the oil cylinder (83) and the loose knife dragging disc (82) are pushed to rise until the locking ring (820) and the loose knife limiting disc (81) are locked with each other, when the main shaft performs a clamping knife action, hydraulic oil is injected into the lower cavity of the piston (80) to drive the piston (80) and the pull rod (7) to move upward, under the action of the reaction force of the hydraulic oil, the oil cylinder (83) and the loose knife dragging disc (82) are pushed to descend until the loose knife dragging disc (82) and the loose knife limiting disc (81) are separated; The rear cover (6) is sealed and fixed with a rear waterproof cover (65) at a position close to the lower end, the inner ring end of the rear waterproof cover (65) is fixed with a water blocking sealing ring (66), the pull rod (7) passes through the water blocking sealing ring (66) and they are rotationally connected; The pull rod (7) and the piston rod (800) form an annular air channel (801), the loose knife dragging disc (82) is located outside the loose knife limiting disc (81) and forms an avoiding gap (802) therebetween, the sidewall of the rear cover (9) is provided with a gas sealing channel (90), the gas sealing channel (90), the inner cavity of the rear cover (9), the avoiding gap (802) and the annular air channel (801) are sequentially communicated, when the gas sealing channel (90) is injected with gas flow, the gas flow sequentially passes through the gas sealing channel (90), the inner cavity of the rear cover (9), the avoiding gap (802), the annular air channel (801) and the inner side of the water blocking sealing ring (66) and is discharged, and the gas sealing is formed at the connection between the pull rod (7) and the water blocking sealing ring (66).

2. The built-in center water outlet mechanism's spindle according to claim 1, wherein, The upper end of the rear cover (9) is fixedly connected with a first hydraulic connector (91) and a second hydraulic connector (92), the first hydraulic connector (91) is communicated with the upper cavity of the piston (80), and the second hydraulic connector (92) is communicated with the lower cavity of the piston (80).

3. The built-in center water outlet mechanism's spindle according to claim 1, wherein, The lower end of the front bearing seat (2) is fixed with a front bearing pressing plate (10), the lower end of the front bearing pressing plate (10) is fixed with a dust ring (11), the lower end of the dust ring (11) is fixed with a ring spray plate (12), the outer side of the rotor (4) is fixed with a rotor outer sleeve (13) and a front waterproof cover (15), the first gap (14) is formed between the rotor outer sleeve (13) and the front bearing pressing plate (10), the dust ring (11) and the ring spray plate (12), the front waterproof cover (15) is located below the rotor outer sleeve (13), the air seal gap (16) is formed between the front waterproof cover (15) and the ring spray plate (12), the air seal air channel (17) is sequentially communicated in the rear cover (9), the steel cylinder (1), the front bearing seat (2), the front bearing pressing plate (10) and the dust ring (11), the air channel connector (93) is arranged at the upper end of the rear cover (9), the air channel connector (93), the air seal air channel (17), the first gap (14) and the air seal gap (16) are sequentially communicated, and the airflow injected by the air channel connector (93) is discharged from the air seal gap (16) and forms an annular air seal.

4. The built-in center water outlet mechanism's spindle according to claim 3, wherein, The lower end edge of the ring spray plate (12) is formed with an annular gas storage pressure stabilizing cavity (120), the annular gas storage pressure stabilizing cavity (120) is communicated with the air seal air channel (17), and the lower end surface of the ring spray plate (12) is provided with a gas passing groove (121), and the gas passing groove (121) is communicated between the annular gas storage pressure stabilizing cavity (120) and the first gap (14).

5. The built-in center water outlet mechanism's spindle according to claim 4, wherein, The lower end surface of the ring spray plate (12) is provided with a plurality of gas passing grooves (121), and the plurality of gas passing grooves (121) are uniformly distributed along the circumference of the ring spray plate (12).

6. The built-in center water outlet mechanism's spindle according to claim 1, wherein, The side of the rear cover (9) is provided with an adjusting hole (94), the rear cover (9) is provided with a dynamic balance adjusting ring (95), the dynamic balance adjusting ring (95) is sleeved on the rotor (4) and is fixedly connected with the rotor (4), the outer side of the dynamic balance adjusting ring (95) is provided with an adjusting screw hole (96), and the adjusting screw hole (96) is arranged in alignment with the adjusting hole (94).

7. The built-in center water outlet mechanism's spindle according to claim 1, wherein, The rotor (4) is fixed with a rotor core (40), a front balance ring (41) and a rear balance ring (42), and the front balance ring (41) and the rear balance ring (42) are arranged at two ends of the rotor core (40).

8. The built-in center water outlet mechanism's spindle according to claim 7, wherein, Four magnetic guide notches (43) are formed in the rotor core (40), and a plurality of magnetic steel sheets (44) are embedded in the rotor core (40) between the adjacent two magnetic guide notches (43).

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