CNC rotary table of broaching machine

Abstract

This application relates to the field of broaching technology and provides a CNC rotary table for a broaching machine. The CNC rotary table includes a base, a rotary table, a worm gear, an annular elastic element, and a servo motor drive. The rotary table and the worm gear are rotatably mounted on the base and connected to each other. The annular elastic element is vertically mounted above the base via an elastic locking element. A top-support working oil chamber is formed between the annular elastic element and the base. An oil passage is formed on the base, with one end of the oil passage leading to the top-support working oil chamber and the other end leading to the outside of the base. When no oil is supplied to the top-support working oil chamber, the elastic locking element applies a downward elastic force to the annular elastic element, causing the annular elastic element to press the worm gear against the base. When oil is supplied to the top-support working oil chamber, the annular elastic element is lifted by the oil, releasing the pressure on the worm gear. The servo motor drive is connected to the worm gear drive. This CNC rotary table of the broaching machine is easy to operate, and the locking of the rotary table is safe and reliable.

Description

Technical Field

[0001] This application relates to the field of broaching technology, and more specifically, to a CNC rotary table for a broaching machine. Background Technology

[0002] The CNC rotary table of a broaching machine is a key component in the field of precision broaching, especially in the machining of tenon grooves for aero-engine turbine disks. Its core function is to precisely position and fix the turbine disk workpiece to be machined, and drive the turbine disk to perform high-precision indexing rotary motion under the command of the CNC system. During machining, the rotary table needs to rotate precisely by a set angle (usually corresponding to a tenon groove position) according to a predetermined program, and then firmly lock itself at that angle, providing an absolutely stable support platform for the broach to perform powerful and precise tenon groove cutting. After the current groove is machined, the rotary table unlocks, rotates to the next groove, and locks again, repeating this cycle until all tenons grooves of the turbine disk are machined. Therefore, the indexing accuracy, rigidity, and reliability, convenience, and efficiency of the locking mechanism of the rotary table directly determine the machining accuracy, surface quality, and overall production efficiency of the turbine disk tenons grooves. In addition, the complex stress conditions such as off-center loading and tilting moment during broaching operations, as well as the need to withstand extremely large broaching forces and constantly changing stress conditions due to the special properties of the turbine disk material, are all working conditions that existing CNC rotary tables cannot meet, and special customization is required.

[0003] In existing technologies, locking and unlocking of CNC rotary tables are usually achieved by inserting and pulling out locking pins. This makes the locking and unlocking process cumbersome, and the locking pins are prone to breakage or incomplete insertion, resulting in poor locking reliability. Summary of the Invention

[0004] In view of this, this application provides a CNC rotary table for a broaching machine to solve the technical problems of cumbersome locking and unlocking operations and poor reliability of the CNC rotary table of a broaching machine in the prior art.

[0005] This application provides a CNC rotary table for a broaching machine, wherein the CNC rotary table of the broaching machine includes a base, a rotary table, a worm gear, an annular elastic element, and a servo motor drive device;

[0006] The rotary table and worm gear are rotatably mounted on the base. The rotary table and worm gear are connected to each other to move synchronously. The annular elastic element is vertically mounted above the base via an elastic locking element. A top-support working oil chamber is formed between the annular elastic element and the base. The base has an oil passage. The first end of the oil passage leads to the top-support working oil chamber, and the second end leads to the outside of the base. When no oil is introduced into the top-support working oil chamber, the elastic locking element applies a downward elastic force to the annular elastic element to press the worm gear against the base, thereby locking the worm gear. When oil is introduced into the top-support working oil chamber, the annular elastic element is lifted by the oil and releases the pressure on the worm gear, allowing the worm gear to rotate relative to the base.

[0007] The servo motor drive is connected to the worm gear transmission to drive the worm gear to rotate relative to the base.

[0008] Furthermore, the base forms an upwardly penetrating locking cylinder, and the elastic locking member includes a first screw and a butterfly spring. The tail of the first screw is threadedly connected to the annular elastic member, and the head of the first screw and the butterfly spring are located in the locking cylinder. The upper end of the butterfly spring abuts against a stop in the locking cylinder, and the lower end of the butterfly spring abuts against the upper end of the head of the first screw.

[0009] Furthermore, the upper end of the annular elastic member forms an annular pressing outer edge portion. When the worm gear is in the locked state, the lower surface of the annular pressing outer edge portion presses down on the worm gear. When the worm gear is in the working state, there is a gap between the lower surface of the annular pressing outer edge portion and the upper surface of the worm gear.

[0010] Furthermore, the upper surface of the base forms a first annular groove arranged around the rotation axis of the rotary table and the worm gear, the lower end of the annular elastic member forms a lower extended annular platform, the lower extended annular platform is vertically and sealingly fitted to the first annular groove, the lower surface of the lower extended annular platform forms a second annular groove arranged along the circumferential direction of the annular elastic member, the first end of the oil passage connects to the first annular groove and the second annular groove, and the lower surface of the lower extended annular platform and the first annular groove form the top support working oil cavity.

[0011] Furthermore, the CNC rotary table of the broaching machine includes a height limiting structure that restricts the rising height of the annular elastic element. The annular elastic element is connected to a mating ring seat, and the mating ring seat forms a screw channel that extends vertically. An inner boss is formed on the inner wall of the screw channel. The height limiting structure includes a second screw, the tail of which faces downward and is threaded to the base. The head of the second screw is located above the inner boss. When the annular elastic element descends to the locked state, the distance between the lower surface of the head of the second screw and the upper surface of the inner boss is the maximum rising height of the annular elastic element.

[0012] Furthermore, the CNC rotary table of the broaching machine includes a turntable and a rotating ring. The turntable is rotatably mounted on the base and can be raised and lowered along its rotation axis. The turntable is connected below the rotary table, and the rotating ring is connected below the turntable. A first set of rollers is arranged between the inner circumference of the mating ring seat and the outer circumference of the turntable. A second set of rollers is arranged between the lower end face of the mating ring seat and the upper end face of the rotating ring. The mating ring seat forms a roller support platform, and the turntable forms a roller abutment platform. The upper end of the first set of rollers abuts against the roller abutment platform, and the lower end of the first set of rollers abuts against the roller support platform. The upper end face of the annular elastic element has a gap with the rotary table.

[0013] Furthermore, the servo motor drive device includes a motor and a worm gear that is drively connected to the motor, the worm gear meshing with the outer teeth of the worm wheel.

[0014] Furthermore, the CNC rotary table of the broaching machine includes a three-way valve connected to the base. The three-way valve has a first valve port, a second valve port, and a third valve port that are interconnected. The first valve port is connected to the second end of the oil passage, the second valve port is connected to a pressure oil source, and the third valve port is connected to a drain oil passage.

[0015] Furthermore, the CNC rotary table of the broaching machine includes a lateral limiting structure movably disposed in the base. The base has an upper extended ring edge, which is located radially outside the worm wheel. When the worm wheel is pressed downward against and fixed to the base, the lateral limiting structure extends from the inner side of the upper extended ring edge and presses against the radially outer side of the worm wheel.

[0016] Furthermore, an arcuate channel is formed on the base, with the first end of the arcuate channel extending through the upper surface of the base and facing the lower surface of the worm gear. The first end of the arcuate channel also extends through the side of the upper extended ring facing the worm gear. The lateral limiting structure includes an arcuate sliding block, the shape of which is adapted to the shape of the arcuate channel and slidably installed within it. A magnetic element is provided at the first end of the arcuate sliding block, adjacent to the first end of the arcuate channel. The magnetic element is located within the arcuate channel. A magnetic ring is connected to the lower end of the worm gear, and an elastic pressure head is provided at the second end of the arc-shaped sliding block. An elastic element is provided between the arc-shaped sliding block and the channel wall of the arc-shaped channel. When the annular elastic element is in the working state, the elastic element keeps the elastic pressure head in the arc-shaped channel. When the annular elastic element is in the locked state, the magnetic ring generates a magnetic repulsion force on the magnetic element, causing the arc-shaped sliding block to move against the elastic force of the elastic element, so that the elastic pressure head extends from the inner side of the upper extended ring edge and presses against the radial outer side of the worm gear.

[0017] The beneficial effects of the CNC rotary table of the broaching machine provided by this invention are as follows:

[0018] Compared to existing technologies, the CNC rotary table of the broaching machine provided by this invention is equipped with an annular elastic element, and the base forms an oil passage. One end of the oil passage leads to the top support working oil chamber, and the other end leads to the outside of the base. Therefore, external oil can be introduced into the top support working oil chamber through the oil passage, lifting the annular elastic element to a working state. This allows the worm gear to be driven to rotate by the servo motor drive device, and the rotary table is unlocked and put into a rotatable state. Alternatively, the oil in the top support working oil chamber can be discharged through the oil passage. The elastic locking element applies a downward elastic force to the annular elastic element, causing the annular elastic element to press the worm gear against the base, thereby fixing and locking the rotary table. The worm gear is pressed downwards and fixed. When the base is in place, the turbine disk fixed to the rotary table can be tenoned. Then, the annular elastic element is continuously switched between working and locked states. Each time the annular elastic element is in the working state, the worm gear is driven to rotate by a predetermined angle through the servo motor drive device, thereby causing the rotary table to drive the turbine disk to rotate by a predetermined angle. Finally, the tenoning of each predetermined position of the turbine disk is completed. The CNC rotary table of this broaching machine can unlock and lock the rotary table by the entry and exit of oil into and out of the top support working oil chamber. Compared with the traditional process of inserting and pulling out the locking pin to unlock and lock the rotary table, the operation is very simple and there will be no problem of the locking pin breaking easily or not being inserted in place, making the locking of the rotary table safer and more reliable.

[0019] Other beneficial effects of the present invention will be described below. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the CNC rotary table of a broaching machine according to an embodiment of this application;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is another cross-sectional view of the CNC rotary table of a broaching machine according to an embodiment of this application;

[0024] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 This is a perspective view of the CNC rotary table of a broaching machine according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the installation of the annular elastic element and the mating ring seat in the CNC rotary table of a broaching machine according to an embodiment of this application;

[0027] Figure 7 This is a partial engagement diagram of the worm gear in the CNC rotary table of a broaching machine according to an embodiment of this application, when the worm gear is suspended above the base.

[0028] Figure 8 This is a partial fit diagram of the worm gear in the CNC rotary table of a broaching machine according to an embodiment of this application, when it is pressed downward against and fixed to the base;

[0029] Figure 9 For the corresponding Figure 7 A schematic diagram of the partial engagement between the arc-shaped sliding block and the base when the worm gear is suspended above the base;

[0030] Figure 10 correspond Figure 8 A schematic diagram showing the partial engagement between the arc-shaped sliding block and the base when the worm gear is pressed downwards and fixed to the base.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Rotary table; 2-Worm gear; 3-Top support working oil chamber; 4-Three-way valve; 5-First screw; 6-Butterfly spring; 7-Second screw; 8-Rotating ring; 9-Lower end cover; 10-First roller group; 11-Second roller group; 12-Third screw; 13-Fourth screw; 14-Fifth screw; 15-Sixth screw; 16-Motor; 17-Worm gear; 18-Magnetic ring; 19-Reset spring; 20-First sprocket; 21-Chain; 22-Second sprocket; 100-Base; 101-Oil passage; 102-First ring 103-Locking cylinder; 104-Stop; 105-Upper extended ring edge; 106-Circular arc channel; 107-Second semi-circular cavity; 200-Annular elastic element; 201-Lower extended ring platform; 202-Second annular groove; 203-Annular pressing outer edge; 300-Matching ring seat; 301-Screw channel; 302-Inner boss; 303-Roller support platform; 400-Turntable; 401-Roller abutment platform; 500-Circular arc sliding block; 501-Magnetic element; 502-Elastic pressure head; 503-First semi-circular cavity. Detailed Implementation

[0033] To facilitate understanding of this application, a more comprehensive description will be provided below with reference to the accompanying drawings. One or at least three embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0034] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0036] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0037] See Figures 1 to 6 This application provides a CNC rotary table for a broaching machine, wherein the CNC rotary table of the broaching machine includes a base 100, a rotary table 1, a worm gear 2, an annular elastic element 200 and a servo motor drive device, and the rotary table 1 is used to fix the worm gear disk to be tenoned;

[0038] A rotary table 1 and a worm gear 2 are rotatably mounted on a base 100. The rotary table 1 and the worm gear 2 are connected to each other to move synchronously. An annular elastic member 200 is vertically mounted above the base 100 via an elastic locking member. A top-support working oil chamber 3 is formed between the annular elastic member 200 and the base 100. An oil passage 101 is formed in the base 100. The first end of the oil passage 101 leads to the top-support working oil chamber 3, and the second end of the oil passage 101 leads to the outside of the base 100. When no oil is introduced into the top-support working oil chamber 3, the elastic locking member applies a downward elastic force to the annular elastic member 200 so that the annular elastic member 200 presses the worm gear 2 against the base 100, so that the worm gear 2 is in a locked state. When oil is introduced into the top-support working oil chamber 3, the annular elastic member 200 is lifted by the oil and releases the pressure on the worm gear 2, so that the worm gear 2 is in a working state that can rotate relative to the base 100.

[0039] The servo motor drive is connected to the worm gear 2 for driving the worm gear 2 to rotate relative to the base 100.

[0040] Because the CNC rotary table of the broaching machine provided by the present invention is provided with an annular elastic element 200, and the base 100 forms an oil passage 101, with the first end of the oil passage 101 leading to the top support working oil chamber 3 and the first end of the oil passage 101 leading to the outside of the base 100, external oil can be introduced into the top support working oil chamber 3 through the oil passage 101, lifting the annular elastic element 200 to the working state, so that the worm gear 2 can be driven to rotate by the servo motor drive device, and the rotary table 1 is also unlocked and put into a rotatable state. The oil in the top support working oil chamber 3 can also be discharged through the oil passage 101. The elastic locking member applies a downward elastic force to the annular elastic element 200 so that the annular elastic element 200 presses the worm gear 2 against the base 100, thereby fixing and locking the rotary table 1, and pressing the worm gear 2 downward against the base 100. When fixed to the base 100, the turbine disk fixed to the rotary table 1 can be tenoned. Then, the annular elastic element 200 is continuously switched between working and locked states. Each time the annular elastic element 200 is in the working state, the worm gear 2 is driven to rotate by a predetermined angle through the servo motor drive device, thereby causing the rotary table 1 to drive the turbine disk to rotate by a predetermined angle, and finally completing the tenoning of each predetermined position of the turbine disk for a whole circle. The CNC rotary table of the broaching machine can unlock and lock the rotary table 1 by the entry and exit of oil into and out of the top support working oil chamber 3. Compared with the traditional process of inserting and pulling out the locking pin to unlock and lock the rotary table 1, the operation is very simple and there will be no situation where the locking pin is easily broken or not inserted in place, making the locking of the rotary table 1 safer and more reliable.

[0041] According to a specific embodiment of this application, the CNC rotary table of the broaching machine includes a three-way valve 4 connected to the base 100. The three-way valve 4 has a first valve port, a second valve port and a third valve port that are interconnected. The first valve port is connected to the second end of the oil passage 101, the second valve port is connected to a pressure oil source, specifically through an oil inlet pump connected to an oil tank, and the third valve port is connected to an oil outlet circuit, which can be connected to an oil tank through a return oil pump.

[0042] According to one embodiment of this application, the base 100 forms an upwardly penetrating locking cylinder 103. The elastic locking member includes a first screw 5 and a butterfly spring 6. The tail of the first screw 5 is threadedly connected to the annular elastic member 200. The head of the first screw 5 and the butterfly spring 6 are located in the locking cylinder 103. The upper end of the butterfly spring 6 abuts against a stop in the locking cylinder 103, and the lower end of the butterfly spring 6 abuts against the upper end of the head of the first screw 5. The upper end of the annular elastic member 200 forms an annular pressing outer edge portion 203. When the worm gear 2 is in the locked state, the lower surface of the annular pressing outer edge portion 203 presses down on the worm gear 2. When the worm gear 2 is in the working state, there is a gap between the lower surface of the annular pressing outer edge portion 203 and the upper surface of the worm gear 2.

[0043] According to one embodiment of this application, the upper surface of the base 100 forms a first annular groove 102 arranged around the rotation axis of the rotary table 1 and the worm gear 2. The annular elastic member 200 is an annular elastic member, and the lower end of the annular elastic member forms a lower extension annular platform 201. The lower extension annular platform 201 is vertically and sealingly fitted to the first annular groove 102. The lower surface of the lower extension annular platform 201 forms a second annular groove 202 arranged along the circumferential direction of the annular elastic member. The first end of the oil passage 101 leads to the first annular groove 102 and the second annular groove 202. The lower surface of the lower extension annular platform 201 and the first annular groove 102 form a top-supporting working oil cavity 3. The top-supporting working oil cavity 3 is an annular cavity that extends a full circumference along the circumferential direction of the annular elastic member.

[0044] According to one embodiment of this application, the CNC rotary table of the broaching machine includes a height limiting structure that restricts the rising height of the annular elastic element. The annular elastic element is connected to a mating ring seat 300, which forms a screw channel 301 extending vertically. An inner boss 302 is formed on the inner wall of the screw channel 301. The height limiting structure includes a second screw 7, the tail of which faces downward and is threadedly connected to the base 100. The head of the second screw 7 is located above the inner boss 302. When the annular elastic element descends to the locked state, the distance between the lower surface of the head of the second screw 7 and the upper surface of the inner boss 302 is the maximum rising height of the annular elastic element. The design of the height limiting structure, on the one hand, prevents the lower extension ring 201 of the annular elastic element 200 from disengaging upward from the first annular groove 102. On the other hand, it ensures that in the working state, the worm gear 2 only needs to rise a small height and float above the base 100, thus avoiding the situation where excessive oil enters the top support working oil chamber 3, leading to increased ineffective energy consumption.

[0045] According to one embodiment of this application, the CNC rotary table of the broaching machine includes a turntable 400 and a rotating ring 8. The turntable 400 is rotatably mounted on a base 100 and can be raised and lowered along its rotation axis. The rotation axis of the turntable 400 is arranged vertically at the center of the base 100. A lower end cover 9 is connected to the base 100. The rotating ring 8 is located above the lower end cover 9 and has a gap with the lower end cover 9. The turntable 400 is connected below the rotary table 1, and the rotating ring 8 is connected below the turntable 400. Since the rotary table 1 is also connected to the worm gear 2, the rotary table 1, the worm gear 2, the turntable 400, and the rotating ring 8 are connected to form a whole that can rotate synchronously together. A first roller group 10 is arranged between the inner circumference of the mating ring seat 300 and the outer circumference of the turntable 400. The first roller group 10 includes a plurality of first rollers arranged in a circle. A second roller group is arranged between the lower end face of the mating ring seat 300 and the upper end face of the rotating ring 8. The second roller group 11 includes multiple second rollers arranged in a circle, forming a roller support platform 303 with a mating ring seat 300. A turntable 400 forms a roller abutment platform 401. The upper end of the first roller group 10 abuts against the roller abutment platform 401, and the lower end of the first roller group 10 abuts against the roller support platform 303. When the annular elastic element is pushed upward by the oil, it drives the mating ring seat 300 to rise, and the mating ring seat 300 applies upward force to the first roller group. The roller assembly 10 lifts the turntable 400, which in turn drives the rotary table 1 and the rotating ring 8 to rise. The rotary table 1 drives the worm gear 2 to rise. The upper end face of the annular elastic element has a gap with the rotary table 1. The first roller assembly 10 forms an outer peripheral limiting guide for the rotation of the turntable 400, and the second roller assembly 11 forms an axial limiting guide for the rotation of the rotating ring 8, making the rotary table 1, worm gear 2, turntable 400 and rotating ring 8 rotate more smoothly and stably as a whole.

[0046] According to a specific embodiment of this application, the worm gear 2 can be connected to the lower part of the rotary table 1 near the outer edge of the rotary table 1 via the third screw 12. The annular elastic element 200, the mating ring seat 300, the turntable 400, and the rotating ring 8 are all located on the inner ring side of the worm gear 2. This makes the spatial layout of the CNC turntable of the broaching machine reasonable, compact, and highly utilized. The annular elastic element is connected to the mating ring seat 300 via the fourth screw 13. The turntable 400 is connected to the lower end of the rotary table 1 via the fifth screw 14. The rotating ring 8 is connected to the lower part of the turntable 400 via the sixth screw 15.

[0047] According to a specific embodiment of this application, the servo motor drive device includes a motor 16 and a worm gear 17 that is drivenly connected to the motor 16. The worm gear 17 meshes with the outer teeth of the worm wheel 2. More specifically, the output shaft of the motor 16 is connected to a first sprocket 20. The first sprocket 20 is drivenly connected to a second sprocket 22 via a chain 21. The second sprocket 22 is connected to the worm gear 17 and is coaxial with it.

[0048] In other embodiments, the power transmission between the motor 16 and the worm gear 17 can also be achieved through a belt drive mechanism or a gear drive mechanism.

[0049] See Figures 7 to 10 According to one embodiment of this application, the CNC rotary table of the broaching machine includes a lateral limiting structure movably disposed in a base 100. The base 100 has an upper extended ring edge 105 located radially outside the worm gear 2. When the worm gear 2 is pressed downward against and fixed to the base 100, the lateral limiting structure extends from the inner side of the upper extended ring edge 105 and presses against the radially outer side of the worm gear 2. Thus, when the worm gear 2 is pressed downward against and fixed to the base 100, the lateral limiting structure also applies a preload force to the radially outer side of the worm gear 2, making the worm gear 2 more securely fixed to the base 100.

[0050] According to a specific embodiment of this application, an arcuate channel 106 is formed on the base 100. The first end of the arcuate channel 106 extends through the upper surface of the base 100 and faces the lower surface of the worm gear 2. The first end of the arcuate channel 106 extends through the side of the upper extended ring edge 105 facing the worm gear 2. The lateral limiting structure includes an arcuate sliding block 500. The shape of the arcuate sliding block 500 is adapted to the shape of the arcuate channel 106 and is slidably installed in the arcuate channel 106. A magnetic element 501 (e.g., a magnet) is provided at the first end of the arcuate sliding block 500 and is adjacent to the first end of the arcuate channel 106. The magnetic element 501 is located inside the arcuate channel 106. A magnetic ring 18 is connected to the lower end of the worm gear 2. An elastic pressure head 502 (e.g., a rubber block) is provided at the second end of the arcuate sliding block 500. An elastic element is provided between the arcuate sliding block 500 and the channel wall of the arcuate channel. When the elastic element 200 is in the working state, the elastic element keeps the elastic pressure head 502 within the arc channel 106. When the annular elastic element 200 is in the locked state, the magnetic ring 18 generates a magnetic repulsion force on the magnetic element 501, causing the arc-shaped sliding block 500 to move against the elastic force of the elastic element, so that the elastic pressure head 502 extends from the inner side of the upper extended ring edge 105 and presses against the radial outer side of the worm gear 2. The side of the arc-shaped sliding block 500 forms a first semi-arc cavity 503, and the base 100 forms a second semi-arc cavity 107 corresponding to the position of the arc channel 106. The first semi-arc cavity 503 and the second semi-arc cavity 107 surround a spring cavity. The elastic element is a return spring 19 installed in the spring cavity. The two ends of the return spring 19 abut against the two ends of the spring cavity along the arc trajectory direction of the arc-shaped sliding block 500, and the return spring 19 also extends along the arc trajectory direction of the arc-shaped sliding block 500.

[0051] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A CNC rotary table for a broaching machine, characterized in that, The CNC rotary table of the broaching machine includes a base, a rotary table, a worm gear, an annular elastic element, and a servo motor drive device; The rotary table and worm gear are rotatably mounted on the base. The rotary table and worm gear are connected to each other to move synchronously. The annular elastic element is vertically mounted above the base via an elastic locking element. A top-support working oil chamber is formed between the annular elastic element and the base. The base has an oil passage. The first end of the oil passage leads to the top-support working oil chamber, and the second end leads to the outside of the base. When no oil is introduced into the top-support working oil chamber, the elastic locking element applies a downward elastic force to the annular elastic element to press the worm gear against the base, thereby locking the worm gear. When oil is introduced into the top-support working oil chamber, the annular elastic element is lifted by the oil and releases the pressure on the worm gear, allowing the worm gear to rotate relative to the base. The servo motor drive is connected to the worm gear transmission to drive the worm gear to rotate relative to the base; The CNC rotary table of the broaching machine includes a lateral limiting structure movably disposed in the base. The base has an upper extended ring edge, which is located radially outside the worm wheel. When the worm wheel is pressed downward against and fixed to the base, the lateral limiting structure extends from the inner side of the upper extended ring edge and presses against the radially outer side of the worm wheel. An arcuate channel is formed on the base. The first end of the arcuate channel extends through the upper surface of the base and faces the lower surface of the worm gear. The first end of the arcuate channel also extends through the side of the upper extended ring facing the worm gear. The lateral limiting structure includes an arcuate sliding block. The shape of the arcuate sliding block is adapted to the shape of the arcuate channel and is slidably installed within the arcuate channel. A magnetic element is provided at the first end of the arcuate sliding block and is adjacent to the first end of the arcuate channel. The magnetic element is located within the arcuate channel. The worm gear... A magnetic ring is connected to the lower end of the worm gear, and an elastic pressure head is provided at the second end of the arc-shaped sliding block. An elastic element is provided between the arc-shaped sliding block and the channel wall of the arc channel. When the annular elastic element is in the working state, the elastic element keeps the elastic pressure head in the arc channel. When the annular elastic element is in the locked state, the magnetic ring generates a magnetic repulsion force on the magnetic element, so that the arc-shaped sliding block moves against the elastic force of the elastic element, causing the elastic pressure head to extend from the inner side of the upper extended ring edge and press against the radial outer side of the worm gear.

2. The CNC rotary table of the broaching machine according to claim 1, characterized in that, The base forms an upwardly penetrating locking cylinder. The elastic locking element includes a first screw and a butterfly spring. The tail of the first screw is threadedly connected to the annular elastic element. The head of the first screw and the butterfly spring are located in the locking cylinder. The upper end of the butterfly spring abuts against a stop in the locking cylinder, and the lower end of the butterfly spring abuts against the upper end of the head of the first screw.

3. The CNC rotary table of the broaching machine according to claim 2, characterized in that, The upper end of the annular elastic element forms an annular pressing outer edge portion. When the worm gear is in the locked state, the lower surface of the annular pressing outer edge portion presses down on the worm gear. When the worm gear is in the working state, there is a gap between the lower surface of the annular pressing outer edge portion and the upper surface of the worm gear.

4. The CNC rotary table of the broaching machine according to claim 3, characterized in that, The upper surface of the base forms a first annular groove arranged around the rotation axis of the rotary table and the worm gear. The lower end of the annular elastic member forms a lower extended annular platform, which is vertically and sealingly fitted into the first annular groove. The lower surface of the lower extended annular platform forms a second annular groove arranged along the circumferential direction of the annular elastic member. The first end of the oil passage connects to the first annular groove and the second annular groove. The lower surface of the lower extended annular platform and the first annular groove form the top support working oil cavity.

5. The CNC rotary table of the broaching machine according to claim 4, characterized in that, The CNC rotary table of the broaching machine includes a height limiting structure that restricts the rising height of the annular elastic element. The annular elastic element is connected to a mating ring seat, which forms a screw channel extending vertically. An inner boss is formed on the inner wall of the screw channel. The height limiting structure includes a second screw with its tail facing downward and threadedly connected to the base. The head of the second screw is located above the inner boss. When the annular elastic element descends to the locked state, the distance between the lower surface of the head of the second screw and the upper surface of the inner boss is the maximum rising height of the annular elastic element.

6. The CNC rotary table of the broaching machine according to claim 5, characterized in that, The CNC rotary table of the broaching machine includes a turntable and a rotating ring. The turntable is rotatably mounted on the base and can be raised and lowered along its rotation axis. The turntable is connected below the rotary table, and the rotating ring is connected below the turntable. A first set of rollers is arranged between the inner circumference of the mating ring seat and the outer circumference of the turntable. A second set of rollers is arranged between the lower end face of the mating ring seat and the upper end face of the rotating ring. The mating ring seat forms a roller support platform, and the turntable forms a roller abutment platform. The upper end of the first set of rollers abuts against the roller abutment platform, and the lower end of the first set of rollers abuts against the roller support platform. The upper end face of the annular elastic element has a gap with the rotary table.

7. The CNC rotary table of the broaching machine according to any one of claims 1 to 6, characterized in that, The servo motor drive device includes a motor and a worm gear that is connected to the motor for transmission, the worm gear meshing with the outer teeth of the worm wheel.

8. The CNC rotary table of the broaching machine according to any one of claims 1 to 6, characterized in that, The CNC rotary table of the broaching machine includes a three-way valve connected to the base. The three-way valve has a first valve port, a second valve port, and a third valve port that are interconnected. The first valve port is connected to the second end of the oil passage, the second valve port is connected to a pressure oil source, and the third valve port is connected to a drain oil passage.

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