Numerical control lathe spindle head and lathe

Abstract

The embodiment of the utility model relates to the technical field of numerical control lathes, and particularly discloses a numerical control lathe spindle head and a lathe, the numerical control lathe spindle head comprises a spindle head base, the spindle head base comprises a base body and a positioning seat, a mounting cavity is arranged in the base body, the positioning seat is fixedly arranged in the mounting cavity, and a first tightening groove is arranged on the positioning seat; the front end of the pulling assembly is arranged in the mounting cavity in a sliding mode, the pulling assembly comprises a pulling base and a pulling cylinder, the pulling cylinder is fixedly installed at the front end of the pulling base and located on the front side of the positioning base, and a second tightening groove is formed in the pulling cylinder; an inserting groove is formed in the elastic collet, the front end of the elastic collet is inserted into the second tightening groove in a sliding mode, the rear end of the elastic collet is inserted into the first tightening groove in a sliding mode, and a first elastic collet head is arranged at the front end of the elastic collet; when the pulling base is pulled to move backwards, the pulling cylinder moves backwards along with the pulling base, the elastic cylinder clamp is pushed to move backwards, and then the shaft to be machined is clamped. By means of the mode, displacement of the shaft to be machined in the axial direction can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled lathes, in particular to a spindle head of a numerically controlled lathe and a lathe. Background Art

[0002] When turning shaft products, the shaft to be processed is usually clamped on the spindle head of the CNC lathe. Figure 1 and Figure 2 As shown, the spindle head in the prior art includes a spindle head base 1, a push cylinder 2 and an elastic collet 3, the push cylinder 2 is slidably installed in the spindle head base 1, an elastic collet 3 is provided at the front end of the elastic collet 3, the elastic collet 3 is sleeved in the push cylinder 2, and the shaft 4 to be processed is inserted in the elastic collet 3; when it is necessary to clamp the shaft 4 to be processed, the push cylinder 2 is pushed forward, and the elastic collet of the elastic collet 3 is squeezed by the outer periphery of the front end of the push cylinder 2 and gradually elastically tightened inward, thereby clamping the shaft 4 to be processed; when it is necessary to loosen the shaft to be processed / processed, the push cylinder 2 retreats, and the elastic collet of the elastic collet 3 gradually loosens and disengages from the push cylinder 2, at this time, the shaft to be processed / processed is in a loosened state, so that it can be pulled forward.

[0003] The inventor of the utility model found that when the shaft to be processed needs to be clamped, the shaft to be processed inserted in the elastic collet is easily moved forward due to the influence of inertia force during the process of pushing the push tube forward, which reduces the clamping accuracy of the shaft to be processed and easily causes deviation in the processing position. Utility Model Content

[0004] In view of the above problems, an embodiment of the utility model provides a CNC lathe spindle head and a lathe, which overcomes the above-mentioned problems of low clamping accuracy and deviation in processing position caused by inertia in the process of pushing the push cylinder forward when the spindle to be processed needs to be clamped.

[0005] According to one aspect of the embodiment of the utility model, there is provided a spindle head of a CNC lathe, comprising: a spindle head base, which comprises a base body and a positioning seat, wherein the base body is provided with a mounting cavity penetrating through the front and rear ends, the positioning seat is fixedly installed in the mounting cavity, and the positioning seat is provided with a first tightening groove penetrating through the front end surface thereof; a pulling assembly, wherein the front end of the pulling assembly is slidably arranged in the mounting cavity, the pulling assembly comprises a pulling seat and a pulling cylinder, the pulling cylinder is fixedly installed at the front end of the pulling seat, the pulling seat is located at the rear side of the positioning seat, and the pulling cylinder is located at the front side of the positioning seat. The pulling cylinder is provided with a second tightening groove running through the front and rear end surfaces thereof; an elastic collet is provided with a slot for inserting the shaft to be processed, the front end of the elastic collet is slidably inserted in the second tightening groove, the rear end of the elastic collet is slidably inserted in the first tightening groove, and the front end of the elastic collet has a first elastic chuck; when the pulling seat is pulled backward, the pulling cylinder moves backward with the pulling seat and pushes the elastic collet to move backward, and the first elastic chuck is gradually elastically tightened inward in the second tightening groove, thereby clamping the shaft to be processed.

[0006] In an optional manner, the rear end of the elastic collet has a second elastic chuck, and when the pulling seat is pulled to move backward, the second elastic chuck is gradually elastically tightened inwardly into the first tightening groove and clamps the shaft to be processed.

[0007] In an optional manner, the first tightening groove has a first frustum surface, the inner diameter of which gradually decreases from front to back, and the front end of the second tightening groove has a second frustum surface, the inner diameter of which gradually increases from front to back; the first elastic clamp is configured to be a frustum shape that cooperates with and abuts against the second frustum surface, and the second elastic clamp is configured to be a frustum shape that cooperates with and abuts against the first frustum surface.

[0008] In an optional manner, the elastic collet includes a collet body, and the first elastic collet and the second elastic collet are respectively installed at the front end and the rear end of the collet body; a plurality of first deformation grooves are spaced apart along the circumferential direction of the outer circumference of the first elastic collet, and the first deformation grooves extend backward from the front end of the first elastic collet to the collet body; a plurality of second deformation grooves are spaced apart along the circumferential direction of the outer circumference of the second elastic collet, and the second deformation grooves extend forward from the rear end of the second elastic collet to the collet body; the first deformation grooves and the second deformation grooves are staggered.

[0009] In an optional manner, a first deformation cavity is further provided at the rear end of each of the first deformation grooves, and a second deformation cavity is further provided at the rear end of each of the second deformation grooves.

[0010] In an optional embodiment, the base body includes an outer cylinder and a first positioning flange integrally formed on the inner wall of the outer cylinder; the positioning seat includes a seat body and a second positioning flange arranged along the outer periphery of the seat body, the first tightening groove is arranged on the seat body, and the second positioning flange is detachably connected to the first positioning flange.

[0011] In an optional manner, a through hole is provided on the first positioning flange, and a clearance hole is provided on the second positioning flange at a position corresponding to the through hole; the pulling seat and the pull cylinder are detachably connected via a connecting column, and the connecting column is sequentially passed through the through hole and the clearance hole.

[0012] In an optional manner, the shaft head base also includes an outer cover, which is arranged at the opening at the front end of the installation cavity, and the outer cover is detachably connected to the outer cylinder. The outer cover is provided with a mounting hole that is connected to the installation cavity and for inserting the shaft to be processed.

[0013] In an optional manner, the rear end of the positioning seat is detachably connected to a first positioning block; and / or the front end of the outer cover is provided with a second positioning block surrounding the periphery of the mounting hole.

[0014] According to another aspect of the embodiments of the utility model, a lathe is provided, comprising the CNC lathe spindle head as described above.

[0015] The beneficial effect of the embodiment of the utility model is that, different from the prior art, the embodiment of the utility model is provided with an axle head base, a pulling assembly and an elastic collet. The axle head base includes a base body and a positioning seat, the base body is provided with an installation cavity that runs through the front and rear ends, the positioning seat is fixedly installed in the installation cavity, and the positioning seat is provided with a first tightening groove that runs through its front end surface, the front end of the pulling assembly is slidably arranged in the installation cavity, the pulling assembly includes a pulling seat and a pulling cylinder, the pulling cylinder is fixedly installed at the front end of the pulling seat, the pulling seat is located at the rear side of the positioning seat, the pulling cylinder is located at the front side of the positioning seat, and the pulling cylinder is provided with a first tightening groove that runs through its front and rear ends. The second tightening grooves on the two end faces, the elastic collet is provided with a slot for inserting the shaft to be processed, the front end of the elastic collet is slidably inserted in the second tightening groove, the rear end of the elastic collet is slidably inserted in the first tightening groove, the front end of the elastic collet has a first elastic chuck, when the pulling seat is pulled backward, the pulling cylinder moves backward with the pulling seat and pushes the elastic collet to move backward, the first elastic chuck gradually elastically tightens inward in the second tightening groove, and then clamps the shaft to be processed. The user installs the shaft to be processed on the elastic tube clamp. When the shaft to be processed needs to be clamped, the pulling tube can be pulled backward by the pulling seat, thereby driving the elastic tube clamp to move backward, and the first elastic clamp is gradually elastically tightened inward in the second tightening groove, thereby clamping the shaft to be processed. At this time, since the shaft to be processed is moving in the direction close to the shaft head base, the existing inertial force will only make the shaft to be processed closer to the shaft head base. Compared with the solution in the prior art, the inertial force in the prior art will cause the eccentric spindle to be processed to move in the direction away from the shaft head base, which may easily cause the processing position of the shaft to be processed to deviate. In the embodiment of the present application, in the process of clamping the shaft to be processed, the shaft to be processed moves in the direction close to the shaft head base, and the movable displacement of the shaft to be processed is within the allowable range, which will not affect the normal processing of the shaft to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 It is an exploded schematic diagram of a spindle head of a CNC lathe in the prior art;

[0018] Figure 2 It is a side sectional view of a spindle head of a CNC lathe in the prior art;

[0019] Figure 3It is a schematic diagram of the assembly structure of the spindle head of a CNC lathe according to an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of a partial structure of a spindle head of a CNC lathe according to an embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of another angle of explosion of a part of the structure of the spindle head of a CNC lathe according to an embodiment of the utility model;

[0022] Figure 6 It is a side sectional view of a partial structure of a spindle head of a CNC lathe according to an embodiment of the utility model;

[0023] Figure 7 The utility model is a schematic diagram of the elastic collet structure of the spindle head of a CNC lathe according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "front", "back" and similar expressions used in this specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0026] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0027] It should be noted that: in this embodiment, the axis to be processed is an eccentric spindle as an example for description, and in other embodiments, the axis to be processed may also be other types of spindles.

[0028] See also Figure 3 and Figure 4The spindle head 1000 of the numerically controlled lathe includes a spindle head base 10, a pulling seat 20, a pull cylinder 30, an elastic collet 40 and a first screw 50. The pull cylinder 30 is fixedly installed at the front end of the pulling seat 20, the pulling seat 20 is located at the rear side of the positioning seat 103, the pull cylinder 30 is located at the front side of the positioning seat 103, the pulling seat 20 can move axially upward relative to the spindle head base 10, the pull cylinder 30 can move with the movement of the pulling seat 20, the elastic collet 40 is installed between the pull cylinder 30 and the spindle head base 10, the elastic collet 40 can move with the pull cylinder 30 toward the direction close to the spindle head base 10 or away from the spindle head base 10, the elastic collet 40 is used to clamp the eccentric spindle 70 to be processed, and the first screw 50 is used to achieve relative fixation between the pulling seat 20 and the pull cylinder 30. The shaft head base 10 , the pulling seat 20 , the pulling cylinder 30 , the elastic collet 40 and the first screw 50 are described in detail below.

[0029] For the above-mentioned shaft head base 10, pulling seat 20 and pull cylinder 30, as Figure 3-Figure 5 As shown, the shaft head base 10 includes a base body 101, a base chassis 102, a positioning seat 103, an outer cover 104 and a second screw 105, the base chassis 102 is detachably connected to the lathe, the base body 101 and the base chassis 102 are detachably connected, the positioning seat 103 is detachably connected to the base body 101, the positioning seat 103 is located between the pulling seat 20 and the pulling cylinder 30, the base body 101 is provided with an installation cavity 101a running through the front and rear ends, the positioning seat 103 is fixedly installed in the installation cavity 101a, the outer cover 104 is covered at the opening at the front end of the installation cavity 101a, the outer cover 104 is detachably connected to the base body 101, and the positioning seat 103 is provided with a first tightening groove 103a running through its front end surface, and the first tightening groove 103a can be used to install the rear end of the elastic collet 40. The pulling seat 20 and the pull cylinder 30 constitute the pulling assembly in the present application, and the front end of the pulling assembly is slidably disposed in the mounting cavity 101a. The pull cylinder 30 is fixedly mounted on the front end of the pulling seat 20, the pulling seat 20 is located at the rear side of the positioning seat 103, and the pull cylinder 30 is located at the front side of the positioning seat 103. The pull cylinder 30 is provided with a second tightening groove 30a that runs through the front and rear end surfaces thereof, and the second tightening groove 30a can be used to install the front end of the elastic collet 40.

[0030] In some embodiments, the base body 101 includes an outer tube 1011 and a first positioning flange 1012 integrally formed on the inner circumferential wall of the outer tube 1011, the positioning seat 103 includes a seat body 1031 and a second positioning flange 1032 arranged along the outer circumference of the seat body 1031, the first tightening groove 103a is arranged on the seat body 1031, the second positioning flange 1032 is detachably connected to the first positioning flange 1012, and the cooperation between the first positioning flange 1012 and the second positioning flange 1032 can realize the positioning seat 103 being limited on the base body 101. Optionally, a through hole 10121 is provided on the first positioning flange 1012, and a clearance hole 10321 is provided on the second positioning flange 1032 at a position corresponding to the through hole 10121, and the through hole 10121 and the clearance hole 10321 facilitate the connection between the pulling seat 20 and the pulling cylinder 30.

[0031] In some embodiments, the rear end of the positioning seat 103 is detachably connected to a first positioning block 1033 , and / or the front end of the outer cover 104 is provided with a second positioning block 1044 around the periphery of the mounting hole 1043 .

[0032] In some embodiments, the outer cover 104 is provided with a mounting hole 1043 which is in communication with the mounting cavity 101a and for inserting the shaft to be processed, the mounting hole 1043 is coaxially arranged with the pull cylinder 30 and the elastic collet 40, and the second screw 105 is used to achieve relative fixation between the outer cover 104 and the base body 101. The eccentric spindle to be processed can be installed into the elastic collet 40 through the mounting hole 1043.

[0033] It should be noted that: since a push-pull structure is usually provided on a lathe, the working principle of the push-pull structure may be the hydraulic principle, the cylinder push-pull principle, the crank slider principle or others. The push-pull structure is connected to the end of the pulling seat 20 away from the pulling cylinder 30, thereby driving the pulling seat 20 to move axially upward relative to the shaft head base 10.

[0034] In some embodiments, please refer to Figure 6 The first tightening groove 103a has a first frustum surface 103aa, and the inner diameter of the first frustum surface 103aa gradually decreases from front to back. The front end of the second tightening groove 30a has a second frustum surface 30aa, and the inner diameter of the second frustum surface 30aa gradually increases from front to back. The first frustum surface 103aa and the second frustum surface 30aa are used to cooperate with the two ends of the elastic collet 40, so as to respectively tighten the two ends of the elastic collet 40 in the first tightening groove 103a and the second tightening groove 30a, thereby clamping the eccentric spindle to be processed.

[0035] In some embodiments, a sealing groove 1014 is provided on one side of the base body 101 close to the outer cover 104, and a sealing protrusion 1042 is provided on one side of the outer cover 104 close to the base body 101. The sealing protrusion 1042 is inserted into the sealing groove 1014. The mutual cooperation between the sealing protrusion 1042 and the sealing groove 1014 improves the sealing effect between the outer cover 104 and the base body 101, and can reduce the entry of external impurities into the installation cavity 101a.

[0036] In some embodiments, a third connecting hole 1041 is provided on the outer cover 104, and a fourth connecting hole 1013 is provided on the side of the base body 101 close to the outer cover 104. The fourth connecting hole 1013 is arranged opposite to the third connecting hole 1041, and one end of the second screw 105 passes through the third connecting hole 1041 and is screwed to the fourth connecting hole 1013, thereby achieving relative fixation between the outer cover 104 and the base body 101.

[0037] It should be noted that: in the process of the pulling seat 20 pulling the pulling cylinder 30 to move toward the direction close to the shaft head base 10, the elastic collet 40 synchronously moves toward the first tightening groove 103a and the second tightening groove 30a, and the inner diameters of the two ends of the elastic collet 40 gradually decrease until the two ends of the elastic collet 40 respectively abut against the bottom of the first tightening groove 103a and the bottom of the second tightening groove 30a, thereby achieving simultaneous clamping of the two ends of the elastic collet 40. In the process of the pulling seat 20 pushing the pulling cylinder 30 to move away from the shaft head base 10, the elastic collet 40 synchronously moves toward the notch of the first tightening groove 103a and the notch of the second tightening groove 30a, and the inner diameters of the two ends of the elastic collet 40 gradually increase, and the eccentric spindle to be processed can be removed from the elastic collet 40.

[0038] In some embodiments, a connecting column 201 is provided on one side of the pull seat 20 close to the pull cylinder 30, and the pull seat 20 and the pull cylinder 30 are detachably connected through the connecting column 201, and the connecting column 201 is sequentially inserted into the through hole 10121 and the clearance hole 10321. The connecting column 201 is used to connect with the pull cylinder 30. Optionally, a first connecting hole 301 is provided on the pull cylinder 30, and a second connecting hole 2011 is provided on the connecting column 201, and the second connecting hole 2011 is arranged opposite to the first connecting hole 301, and one end of the first screw 50 passes through the first connecting hole 301 and is screwed to the second connecting hole 2011, so as to achieve relative fixation between the pull seat 20 and the pull cylinder 30. It can be understood that: the connection method between the pull seat 20 and the pull cylinder 30 is not limited to the above-mentioned screw connection, and can also be other connection methods, such as: clamping, riveting, mortise and tenon connection, welding, etc.

[0039] For the elastic collet 40, as Figure 4 , Figure 5 as well as Figure 7 As shown, the elastic collet 40 is provided with a slot 40a for inserting the shaft to be processed, the front end of the elastic collet 40 is slidably inserted in the second tightening groove 30a, and the rear end of the elastic collet 40 is slidably inserted in the first tightening groove 103a. The front end of the elastic collet 40 has a first elastic clamp 401. When the pulling seat 20 is pulled backward, the pulling cylinder 30 moves backward with the pulling seat 20 and pushes the elastic collet 40 to move backward. The first elastic clamp 401 is gradually elastically tightened inward in the second tightening groove 30a, thereby clamping the shaft to be processed.

[0040] In some embodiments, the rear end of the elastic collet 40 has a second elastic collet 402. When the pulling seat 20 is pulled backward, the second elastic collet 402 is gradually elastically tightened inward in the first tightening groove 103a and clamps the shaft to be processed. The elastic collet 40 can move with the pulling cylinder 30 toward the first tightening groove 103a or away from the first tightening groove 103a. At the same time, the elastic collet 40 can move toward the second tightening groove 30a or away from the second tightening groove 30a. The elastic collet 40 is used to clamp the shaft to be processed, and when the elastic collet 40 moves toward the first tightening groove 103a, the inner diameter of one end of the elastic collet 40 gradually decreases, and when the elastic collet 40 moves away from the first tightening groove 103a, the inner diameter of one end of the elastic collet 40 gradually increases; when the elastic collet 40 moves toward the second tightening groove 30a, the inner diameter of the other end of the elastic collet 40 gradually decreases, and when the elastic collet 40 moves away from the second tightening groove 30a, the inner diameter of the other end of the elastic collet 40 gradually increases. Wherein, when the inner diameter of the elastic collet 40 gradually decreases, the elastic collet 40 gradually clamps the eccentric main shaft to be processed, and when the inner diameter of the elastic collet 40 gradually increases, the elastic collet 40 gradually releases the eccentric main shaft to be processed. Optionally, please refer to Figure 6 The first elastic clamp 401 is configured to be a truncated cone that cooperates with the second truncated cone surface 30aa, and the second elastic clamp 402 is configured to be a truncated cone that cooperates with the first truncated cone surface 103aa.

[0041] In some embodiments, the elastic collet 40 includes a collet body 403, the first elastic collet 401 and the second elastic collet 402 are respectively installed at the front end and the rear end of the collet body 403, and a plurality of first deformation grooves 4011 are spaced apart along the circumferential direction of the outer circumference of the first elastic collet 401, and the first deformation grooves 4011 extend backward from the front end of the first elastic collet 401 to the collet body 403, and a plurality of second deformation grooves 4021 are spaced apart along the circumferential direction of the outer circumference of the second elastic collet 402, and the second deformation grooves 4021 extend forward from the rear end of the second elastic collet 402 to the collet body 403, and the first deformation grooves 4011 and the second deformation grooves 4021 are staggered.

[0042] In some embodiments, the rear end of each first deformation groove 4011 is further provided with a first deformation cavity 4031, and the rear end of each second deformation groove 4021 is further provided with a second deformation cavity 4032. The second deformation cavity 4032 facilitates the elastic deformation of the second elastic collet 402 to tighten or loosen the second deformation groove 4021 to achieve the change of the size of the inner diameter of one end of the elastic collet 40, and the first deformation cavity 4031 facilitates the elastic deformation of the first elastic collet 401 to tighten or loosen the first deformation groove 4011 to achieve the change of the size of the inner diameter of the other end of the elastic collet 40.

[0043] In the embodiment of the utility model, an axle head base 10, a pulling assembly and an elastic collet 40 are provided. The axle head base 10 includes a base body 101 and a positioning seat 103. The base body 101 is provided with an installation cavity 101a that runs through the front and rear ends. The positioning seat 103 is fixedly installed in the installation cavity 101a, and the positioning seat 103 is provided with a first tightening groove 103a that runs through the front end surface thereof. The front end of the pulling assembly is slidably arranged in the installation cavity 101a. The pulling assembly includes a pulling seat 20 and a pull cylinder 30. The pull cylinder 30 is fixedly installed at the front end of the pulling seat 20. The pulling seat 20 is located at the rear side of the positioning seat 103, and the pull cylinder 30 is located at the front side of the positioning seat 103. The pull cylinder 30 A second tightening groove 30a is provided on it which runs through the front and rear end surfaces thereof, and a slot 40a for inserting the shaft to be processed is provided in the elastic collet 40, the front end of the elastic collet 40 is slidably inserted in the second tightening groove 30a, and the rear end of the elastic collet 40 is slidably inserted in the first tightening groove 103a, and the front end of the elastic collet 40 has a first elastic clamp 401. When the pulling seat 20 is pulled backward, the pulling cylinder 30 moves backward with the pulling seat 20 and pushes the elastic collet 40 to move backward, and the first elastic clamp 401 is gradually elastically tightened inwardly in the second tightening groove 30a, thereby clamping the shaft to be processed. The user installs the shaft to be processed on the elastic collet 40. When the shaft to be processed needs to be clamped, the pulling cylinder 30 can be pulled backward by the pulling seat 20, thereby driving the elastic collet 40 to move backward, and the first elastic clamp 401 is gradually elastically tightened inward in the second tightening groove 30a, thereby clamping the shaft to be processed. At this time, since the shaft to be processed moves in the direction close to the shaft head base 10, the existing inertial force will only make the shaft to be processed closer to the shaft head base 10. Compared with the solution in the prior art, the inertial force in the prior art will cause the eccentric spindle to be processed to move in the direction away from the shaft head base 10, which may easily cause the processing position of the shaft to be processed to deviate. In the embodiment of the present application, in the process of clamping the shaft to be processed, the shaft to be processed moves in the direction close to the shaft head base 10, and the movable displacement of the shaft to be processed is within the allowable range, which will not affect the normal processing of the shaft to be processed.

[0044] The utility model also provides an embodiment of a lathe, which includes the above-mentioned CNC lathe spindle head. The function and structure of the CNC lathe spindle head can be referred to the above-mentioned embodiment, and will not be described in detail here.

[0045] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spindle head for a CNC lathe, characterized in that: include: The shaft head base includes a base body and a positioning seat, wherein the base body is provided with a mounting cavity penetrating through the front and rear ends, the positioning seat is fixedly installed in the mounting cavity, and the positioning seat is provided with a first tightening groove penetrating through the front end surface thereof; A pulling assembly, the front end of which is slidably arranged in the installation cavity, the pulling assembly comprises a pulling seat and a pulling cylinder, the pulling cylinder is fixedly installed at the front end of the pulling seat, the pulling seat is located at the rear side of the positioning seat, the pulling cylinder is located at the front side of the positioning seat, and the pulling cylinder is provided with a second tightening groove penetrating the front and rear end surfaces thereof; An elastic collet, wherein a slot for inserting the shaft to be processed is provided in the elastic collet, the front end of the elastic collet is slidably inserted in the second tightening groove, the rear end of the elastic collet is slidably inserted in the first tightening groove, and the front end of the elastic collet has a first elastic chuck; When the pulling seat is pulled to move backward, the pulling cylinder moves backward following the pulling seat and pushes the elastic collet to move backward, and the first elastic collet is gradually elastically tightened inwardly in the second tightening groove, thereby clamping the shaft to be processed.

2. The spindle head of the CNC lathe according to claim 1, characterized in that: The rear end of the elastic collet is provided with a second elastic chuck. When the pulling seat is pulled to move backward, the second elastic chuck is gradually elastically tightened inwardly in the first tightening groove and clamps the shaft to be processed.

3. The spindle head of the CNC lathe according to claim 2, characterized in that: The first tightening groove has a first frustum surface, the inner diameter of which gradually decreases from front to back, and the front end of the second tightening groove has a second frustum surface, the inner diameter of which gradually increases from front to back; The first elastic clamp is configured to be in a truncated cone shape that cooperates with and abuts against the second truncated cone surface, and the second elastic clamp is configured to be in a truncated cone shape that cooperates with and abuts against the first truncated cone surface.

4. The CNC lathe spindle head according to claim 2, characterized in that: The elastic collet comprises a collet body, and the first elastic collet and the second elastic collet are respectively mounted on the front end and the rear end of the collet body; A plurality of first deformation grooves are arranged at intervals along the outer circumference of the first elastic collet, and the first deformation grooves extend backward from the front end of the first elastic collet to the collet body; A plurality of second deformation grooves are arranged at intervals along the outer circumference of the second elastic collet, and the second deformation grooves extend forward from the rear end of the second elastic collet to the collet body; The first deformation grooves and the second deformation grooves are arranged alternately.

5. The CNC lathe spindle head according to claim 4, characterized in that: A first deformation cavity is further provided at the rear end of each of the first deformation grooves, and a second deformation cavity is further provided at the rear end of each of the second deformation grooves.

6. The CNC lathe spindle head according to claim 1, characterized in that: The base body comprises an outer tube and a first positioning flange integrally formed on the inner circumferential wall of the outer tube; The positioning seat includes a seat body and a second positioning flange arranged along the outer periphery of the seat body, the first tightening groove is arranged on the seat body, and the second positioning flange is detachably connected to the first positioning flange.

7. The CNC lathe spindle head according to claim 6, characterized in that: A through hole is formed on the first positioning flange, and a clearance hole is formed on the second positioning flange at a position corresponding to the through hole; The pulling seat and the pulling cylinder are detachably connected via a connecting column, and the connecting column is sequentially penetrated through the through hole and the giving way hole.

8. The CNC lathe spindle head according to claim 6, characterized in that: The shaft head base also includes an outer cover, which is arranged at the opening of the front end of the installation cavity. The outer cover is detachably connected to the outer cylinder, and the outer cover is provided with a mounting hole which is connected to the installation cavity and for inserting the shaft to be processed.

9. The CNC lathe spindle head according to claim 8, characterized in that: The rear end of the positioning seat is detachably connected to a first positioning block; and / or, A second positioning block is disposed at the front end of the outer cover surrounding the outer circumference of the mounting hole.

10. A lathe, characterized in that: It comprises the spindle head of a CNC lathe as described in any one of claims 1 to 9.

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