Shaft core connecting structure and air main shaft

Abstract

The utility model discloses a shaft core connecting structure and an air main shaft, a bottom ring and a pressing ring are respectively sleeved on a broach rod, the bottom ring is arranged on one side close to a pull claw, a plurality of positioning columns are symmetrically arranged on one side of the bottom ring close to the pull claw, an elastic piece is sleeved on the broach rod, and two ends of the elastic piece are respectively abutted against the bottom ring and the pressing ring. The locking piece is locked at the end, away from the pulling claw, of the broach rod and abuts against the pressing ring, a supporting table is arranged in a middle cavity of the shaft core, a plurality of positioning holes are formed in the supporting table, the broach rod stretches into the middle cavity, the bottom ring abuts against the supporting table, and the positioning columns are embedded into the positioning holes. The positioning column is matched with the positioning hole, so that the stable state of the bottom ring can be kept, axial vibration and radial deviation cannot be generated, collision with an elastic piece or a broach rod is avoided, the stability of all parts in the up-down moving process of the whole broach rod can be kept, fatigue damage caused by contact or collision is avoided, and the service life of the broach rod is prolonged. The service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of air spindle related devices, and in particular to a spindle core connection structure and an air spindle having the same. Background Technology

[0002] The air spindle uses an air bearing to rotate and support the spindle. It generates an air film between the spindle and the bearing to support and reduce friction. During operation, the tool is fixed and driven to rotate at high speed by the broaching mechanism inside the spindle. The broaching mechanism uses a disc spring and a cylinder to control the locking or unlocking of the tool holder.

[0003] When an air spindle operates at high speed, it generates centrifugal force. For some components in a broaching mechanism, such as a spring seat (bottom ring) that limits the elastic element on the broaching rod, it is not fixedly connected to the broaching rod, but is positioned and fixed by the elastic force of the elastic element. Such non-fixed rotating parts (such as the spring seat and the spindle core not being fixedly connected) may cause circumferential displacement at high speeds, which will affect the vibration value of the spindle and the surface finish of the parts. In addition, during the process of the elastic element returning from the compressed state, it may also shift or rotate due to the change in the state of the elastic element. Utility Model Content

[0004] The purpose of this utility model is to provide a shaft core connection structure and an air spindle. The cooperation between the positioning pin and the positioning hole can maintain the stability of the bottom ring, prevent axial vibration and radial offset, avoid collision with the elastic element or the drawbar, maintain the stability between the components during the up and down movement of the entire drawbar, avoid fatigue damage caused by contact or collision, and improve service life.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a shaft core connection structure, including a shaft core, a drawbar, and a pull claw disposed at one end of the drawbar, and further including:

[0006] A bottom ring and a pressure ring are respectively fitted onto the pull rod, with the bottom ring located on the side closer to the pull claw. Multiple positioning pins are symmetrically arranged on the bottom ring on the side closer to the pull claw.

[0007] An elastic element is sleeved on the drawbar, and its two ends abut against the bottom ring and the pressure ring, respectively.

[0008] A locking element, which locks onto the end of the pull bar away from the pull claw and abuts against the pressure ring,

[0009] The shaft core has a central cavity, and a support platform is provided in the central cavity. The support platform has multiple positioning holes. When the pull rod extends into the central cavity, the bottom ring abuts against the support platform, and the positioning pin is embedded in the positioning hole.

[0010] As a further optimization, the pull bar includes a top section, a middle section and a tail section connected in sequence. The diameter of the middle section is larger than the diameter of the top section, and a limiting platform is formed between the two. The bottom ring is sleeved on the middle section and abuts against the limiting platform. A mounting hole is provided on the side of the tail section away from the middle section, and the pull claw is screwed into the mounting hole.

[0011] As a further optimization, the bottom ring includes an upper piece and a lower piece, both of which are provided with through holes penetrating their respective bodies. The lower end of the upper piece is provided with an insertion post, and the lower piece is provided with an insertion hole penetrating its body. The upper piece abuts against the lower piece, and the insertion post passes through the insertion hole to form the positioning post, thereby realizing the detachable installation and installation of the bottom ring, which is convenient for various application scenarios, such as when the cooperation between the positioning post and the positioning hole is not required.

[0012] As a further optimization, the number of positioning posts is two to four, preferably two.

[0013] As a further optimization, the elastic element includes a plurality of abutting disc springs.

[0014] As a further optimization, the elastic element also includes one or more spacers disposed between the disc springs, and the elastic force and stroke requirements of the elastic element are met by adding, removing or replacing the spacers.

[0015] As a further optimization, the disc spring is made of chromium vanadium alloy steel, which can improve the service life of the disc spring.

[0016] As a further optimization, the locking component includes a locking bolt with a first locking hole, and the pull rod has an external thread. The first locking hole is screwed onto the pull rod and abuts against the pressure ring.

[0017] As a further optimization, the locking component also includes a pressure plate with a non-circular hole penetrating its body. The upper end of the pull bar has a limiting block that matches the non-circular hole. The pressure plate abuts against the locking bolt, and the non-circular hole is fitted onto the limiting block. The upper end of the locking bolt has a second locking hole. The pressure plate is fixedly connected to the locking bolt by a screw that passes through its body and extends into the second locking hole, which can prevent the locking bolt from moving after rotation.

[0018] This utility model also provides an air spindle, including the above-mentioned spindle core connection structure.

[0019] Compared with the prior art, the present invention has the following advantages: the bottom ring is kept stable by the cooperation of the positioning pin and the positioning hole, and there will be no axial vibration or radial offset. It avoids collision with the elastic element and the drawbar. The stability of the bottom ring can maintain the stability between the components during the up and down movement of the entire drawbar, avoid fatigue damage caused by contact or collision, and improve service life. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the air spindle of this utility model.

[0021] Figure 2 This is a schematic diagram showing the broach of this utility model located inside the shaft core.

[0022] Figure 3 This is a structural diagram of the broach of this utility model.

[0023] Figure 4 This is a structural diagram of the drawbar of this utility model.

[0024] Figure 5 This is a structural diagram of the bottom ring in another embodiment of the present invention.

[0025] Figure 6 This is a structural diagram of the locking component of this utility model. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figures 1 to 3 As shown, the shaft connection structure includes a shaft core 60, a pull rod 10, and a pull claw 50 disposed at one end of the pull rod 10. It also includes a bottom ring 21, a pressure ring 23, an elastic element 30, and a locking element 40. The bottom ring 21 and the pressure ring 23 are respectively sleeved on the pull rod 10, with the bottom ring 21 located near the pull claw 50. A plurality of positioning pins 22 are symmetrically arranged on the bottom ring 21 near the pull claw 50, preferably two. The elastic element 30 is sleeved on the pull rod 10, and its two ends are respectively connected to the bottom ring 21 and the pressure ring 23. The ring 23 abuts against each other, and the locking member 40 is locked to the end of the pull bar 10 away from the pull claw 50, and abuts against the end of the pressure ring 23 away from the elastic member 30. The shaft core 60 has a central cavity 600, and a support platform 601 is provided in the central cavity 600. The support platform 601 is provided with positioning holes 602 that match the number of positioning pins 22, that is, it has two symmetrically arranged positioning holes 602. When the pull bar 10 extends into the central cavity 600, the bottom ring 21 abuts against the support platform 601, and the positioning pins 22 are embedded in the positioning holes 602.

[0028] In this invention, the broach is disposed in the core 60 of the air spindle 100. Specifically, the elastic element 30 is disposed between the bottom ring 21 and the pressure ring 23 to provide elastic force. The pressure ring 23 is limited by the locking element 40 fixed to the broach rod 10 at the end away from the broach claw 50. The broach rod 10, the bottom ring 21, the elastic element 30 and the broach 50 and other components are inserted into the middle cavity 600 of the core 60. After insertion, the broach rod 10 can be rotated by fine adjustment so that the positioning pins 22 can be inserted into the corresponding positioning holes 602 respectively. The bottom ring 21 abuts against the support table 601 to complete the assembly, and the entire broach structure can be placed in the air spindle 100. When the tool needs to be installed, the drawbar 10 is pushed downward in the cavity 600 of the shaft core 60 by an external force. At this time, the elastic element 30 is in a compressed state. The elastic restoring force of the elastic element 30 presses the bottom ring 21 and the pressure ring 23 on both sides respectively. After the pull claw 50 moves downward, it is flared due to the small restriction of the shaft core 60, allowing the tool shank to be inserted into it. After the tool is installed, the drawbar 10 moves upward in the cavity 600 of the shaft core 60 by an external force. At this time, the elastic element 30 has a restoring tendency and moves upward against the pressure ring 23 until it returns to its original state. The upward pushing action of the elastic element 30 on the pressure ring 23 causes the drawbar 10 to pull the pull claw 50 upward. The upward movement of the drawbar 10 drives the puller 50 and the tool to move upward. After the puller 50 is restricted again, the tool is fixed. During the upward movement of the broach rod 10 within the cavity 600, the pressure applied to the bottom ring 21 by the elastic element 30 during its recovery from deformation is relatively reduced. However, since the positioning pin 22 is positioned within the positioning hole 602, the bottom ring 21 can maintain a stable state, i.e., it will not generate axial vibration or radial offset. The bottom ring 21 will not generate impact force with the elastic element 30, nor will it collide with the broach rod 10. The stability of the bottom ring 21 can maintain the stability between the components during the up-and-down movement of the entire broach rod 10, avoid fatigue damage caused by contact or collision, and improve the service life of the broach structure and the air spindle 100.

[0029] Preferred, such as Figure 4As shown, the pull rod 10 includes a top section 12, a middle section 11, and a tail section 13 connected in sequence. The diameter of the middle section 11 is larger than that of the top section 12, forming a limiting platform 111 between them. The bottom ring 21 is sleeved on the middle section 12 and abuts against the limiting platform 111, which can limit the position of the bottom ring 21 on the pull rod 10. This facilitates the installation of the elastic element 30 on the pull rod 10 after the bottom ring 21 is positioned. After the pressure ring 23 and the locking element 40 are installed, they form an integral part embedded in the central cavity 500. Because the position of the bottom ring 21 is fixed, the components sleeved on the pull rod 10 can smoothly enter the central cavity 600. The bottom ring 21 will not slide quickly along the pull rod 10 and abut against the support platform 601, thus avoiding collision. Moreover, because the bottom ring 21 is clamped by the support platform 601 and the elastic element 30, a certain stability can be ensured. During installation, it can be rotated more conveniently to align the positioning post 22 with the positioning hole 602.

[0030] Specifically, a mounting hole (not shown) is provided on the side of the tail section 13 away from the middle section 11, and the pull claw 50 is screwed into the mounting hole to achieve stable installation.

[0031] like Figure 5 As shown, in another embodiment of this utility model, the bottom ring 21 includes an upper piece 211 and a lower piece 212, both of which have through holes penetrating their respective bodies. The upper piece 211 has a first through hole 2110, and the lower piece 212 has a second through hole 2120. The through holes are used to fit onto the puller rod 10. The lower end of the upper piece 211 has an insertion post 2111, and the lower piece 212 has an insertion hole 2121 penetrating its body. The upper piece 211 abuts against the lower piece 212, and the insertion post 2111 passes through the insertion hole 2121 to form a positioning post 22. That is, the bottom ring 21 is designed to be detachable. In terms of assembly, when the positioning pin 22 is required, the upper piece 211 and the lower piece 212 are stacked, and the insertion pin 2111 passes through the insertion hole 2121 to cooperate with the positioning hole 602 on the support table 601; when the positioning pin 22 is not required, that is, the upper piece 211 and the insertion pin 2111 on it are not required, the upper piece 211 can be removed, and only the lower piece 212 is sleeved on the pull rod 10 to abut against the elastic member 30. The elastic force and stroke requirements of the elastic member 30 can be ensured by adjusting the length of the elastic member 30 or adjusting the locking position of the locking member 40.

[0032] Preferably, the elastic element 30 includes a plurality of abutting disc springs 31, and adjacent disc springs on the drawbar 10 can achieve the required elastic force and stroke by engaging and overlapping each other; preferably, the disc springs 31 are made of chromium vanadium alloy steel, which has the characteristics of high hardness and high wear resistance, and can have a long service life.

[0033] In addition, the elastic element 30 also includes one or more spacers 32 disposed between the disc springs 31, and the spacers 32 can also meet the requirements of elasticity and stroke.

[0034] Combination Figure 4 and Figure 6 As shown, the locking component 40 includes a locking bolt 41, a first locking hole 411 on the locking bolt 41, and an external thread on the pull bar 10. The first locking hole 411 is screwed onto the pull bar 10 and abuts against the pressure ring 23.

[0035] Furthermore, the locking component 40 also includes a pressure plate 42, which has a non-circular hole 421 penetrating its body. The upper end of the pull bar 10 has a limiting block 121 matching the non-circular hole 421, and a limiting platform 122 is located beside the limiting block 121. The pressure plate 42 abuts against the locking bolt 41 and the limiting platform 122, and the non-circular hole 421 is fitted onto the limiting block 121. The upper end of the locking bolt 41 has a second locking hole 412, and the pressure plate 42 has a through hole 420. The pressure plate 421... The screw 422, which passes through the through hole 420 and extends into the second locking hole 412, is fixedly connected to the locking bolt 41. The non-circular hole 421 is engaged with the limit block 121 to prevent rotation, and the screw 422 is engaged with the second locking hole 412 to lock the plate 42 in a non-rotational manner. This prevents the locking thread 41 from rotating or moving due to vibration or other reasons, ensuring the stability of the locking part 40 and stabilizing the elastic part 30 to meet its elastic force and stroke requirements.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A shaft core connecting structure comprising a shaft core, a broach rod, and a broach jaw provided at one end of the broach rod, characterized by, Also comprising: a bottom ring and a pressing ring, both of which are sleeved on the drawbar rod, and the bottom ring is located near the draw claw, and a plurality of positioning columns are symmetrically arranged on the side of the bottom ring near the draw claw, a resilient member, which is sleeved on the drawbar rod, and both ends thereof are in abutment with the bottom ring and the pressing ring respectively, a locking member, which is locked on the end of the drawbar rod far from the draw claw, and is in abutment with the pressing ring, the shaft core has a middle cavity, a support table is arranged in the middle cavity, and a plurality of positioning holes are arranged on the support table, when the drawbar rod extends into the middle cavity, the bottom ring is in abutment on the support table, and the positioning columns are embedded in the positioning holes.

2. The shaft core connecting structure according to claim 1, characterized by the drawbar rod comprises a top section, a middle section and a tail section connected in sequence, the diameter of the middle section is greater than that of the top section, a limiting table is formed between the two, the bottom ring is sleeved on the middle section and is in abutment on the limiting table; an installation hole is arranged on the side of the tail section far from the middle section, and the draw claw is screwed in the installation hole.

3. The shaft core connecting structure according to claim 1, characterized by the bottom ring comprises an upper piece and a lower piece, both of which are provided with through holes penetrating through the bodies thereof, the lower end of the upper piece is provided with an insertion column, the lower piece is provided with an insertion hole penetrating through the body thereof, the upper piece is in abutment on the lower piece, and the insertion column forms the positioning column after penetrating through the insertion hole.

4. The shaft core connecting structure according to claim 1 or 3, characterized by the number of the positioning columns is two to four.

5. The shaft core connecting structure according to claim 1, wherein the resilient member comprises a plurality of abutting disc springs.

6. The shaft core connecting structure according to claim 5, characterized by the resilient member further comprises one or more spacer rings arranged between the disc springs.

7. The shaft core connecting structure according to claim 5 or 6, characterized by the material of the disc spring is chromium-vanadium alloy steel.

8. The shaft core connecting structure according to claim 1, wherein the locking member comprises a locking bolt, the locking bolt is provided with a first locking hole, the drawbar rod is provided with an external thread, the first locking hole is screwed on the drawbar rod and is in abutment with the pressing ring.

9. The shaft core connecting structure according to claim 8, characterized by the locking member further comprises a pressing piece, the pressing piece is provided with a non-circular hole penetrating through the body thereof, the upper end of the drawbar rod is provided with a limiting block matched with the non-circular hole, the pressing piece is in abutment on the locking bolt, and the non-circular hole is sleeved on the limiting block, the upper end of the locking bolt is provided with a second locking hole, and the pressing piece is fixedly connected with the locking bolt through the screw penetrating through the body thereof and extending into the second locking hole.

10. Air spindle, characterized in that the shaft core connecting structure of any one of claims 1 to 9 is included.

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