Rotating clamping device and automatic copper tube changing device for EDM punching machine

Abstract

The present invention proposes a rotating clamping device and an automatic copper tube changing device for an electric spark punching machine, comprising a hollow rotating shaft, a driving assembly being provided on the outside of the hollow rotating shaft for driving the hollow rotating shaft to rotate; an elastic clamping head is provided at the bottom of the hollow rotating shaft, a stop ring is threadedly connected to the outer side of the bottom of the hollow rotating shaft, the elastic clamping head passes through the stop ring, and the end of the elastic clamping head is pressed against the end of the hollow rotating shaft by the stop ring, a rubber water stop plug is provided between the elastic clamping head and the hollow rotating shaft, a through hole is provided in the center of the rubber water stop plug for the copper tube to pass through, the device improves the verticality of the copper tube when punching the tube and the speed of lowering the tube, and improves the accuracy of punching; the rotating clamping device can not only achieve internal water tightness and prevent water tightness during rotation after punching the copper tube, but also realize the rotation of the rotating shaft and the clamping and loosening of the copper tube through a single driving power, thereby improving the compactness of the structure.

Description

Technical Field

[0001] The invention relates to the field of electric spark electrode replacement equipment, in particular to a rotating clamping device and an automatic copper tube replacement device for an electric spark punching machine. Background Art

[0002] Unlike wire-cut EDM machines and forming machines, an EDM puncher uses a hollow copper tube as the electrode for the electric pulse. High-pressure water flows through a small hole in the center of the tube, providing cooling and chip removal. The discharge between the electrode and the metal generates high-temperature corrosion, achieving the desired hole. EDM punchers are used to create fine holes in ultra-hard steel, cemented carbide, copper, aluminum, and any other conductive material. They can produce holes as small as 0.015mm, even tapered ones. They are widely used in precision mold manufacturing. However, the copper tube is constantly consumed during the process, and when the length no longer meets the machining requirements, it must be replaced.

[0003] The efficiency of manual replacement is extremely low. After searching, in the prior art, CN 212599508 U discloses an automatic copper tube changing device for a punching machine and CN 218168988 U discloses an automatic tube feeding device for an electric spark punching machine. The copper tube is unloaded by vibration, which actually causes the entire machine to make a very loud noise. Moreover, when replacing the copper tube disclosed in CN 212599508 U, the copper tube is fixed by a cylinder and pushed up and down as a whole. Moreover, the copper tube is an ultra-fine tube with a diameter of 0.15mm-3mm. It is difficult to align the long-distance tube feeding and perforation. In the actual processing process, high-pressure water needs to be injected to reduce internal waste chips. Moreover, the copper tube needs to be rotated while being processed. It is not easy to drive the rotation and realize the compression structure of the copper tube.

[0004] Also referring to the comparative document CN 218168989 U, an automatic tube changing device for an electrospark perforator is disclosed. The structure of the device is shown in the accompanying drawings. The copper tube is fed and clamped by a first collet and a spring, which is similar to the principle of a mechanical pencil. However, this method has extremely low wire feeding efficiency. Moreover, after the copper tube is stretched, it needs to be inserted into the eye mold at the bottom of the machine during actual processing, and the stroke is relatively long. In actual operation, the copper tube will shake or tilt when it reaches the bottom under this method, and the long-distance feeding will cause the perforation to be misaligned.

[0005] In addition, in combination with the above-mentioned comparative documents and existing technologies, when the copper tube is being punched, the machine usually retracts the copper tube after a small hole is formed on the metal part through photoelectric sensors, infrared sensors, etc. The reason is that the water in the copper tube flows downward from the copper tube, causing a circuit break between the copper tube and the metal. However, in fact, the hole diameter requirement on the metal plate has not yet been met, and the above-mentioned unstable phenomenon often occurs when using ordinary sensors. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention proposes a rotating clamping device, comprising a hollow rotating shaft,

[0007] A driving assembly is provided outside the hollow rotating shaft for driving the hollow rotating shaft to rotate;

[0008] An elastic clamping head is provided at the bottom of the hollow rotating shaft, and a stop ring is threadedly connected to the outer side of the bottom of the hollow rotating shaft. The elastic clamping head passes through the stop ring, and the end of the elastic clamping head is pressed against the end of the hollow rotating shaft through the stop ring. A rubber water stopper is provided between the elastic clamping head and the hollow rotating shaft, and a through hole is provided in the center of the rubber water stopper for the copper pipe to pass through;

[0009] A first guide is connected to the hollow rotating shaft, a through hole is provided at the center of the first guide, and a tapered hole is provided at the end of the through hole;

[0010] The bottom of the stop ring is coaxially connected to a clamping ring. The hollow rotating shaft rotates relative to the stop ring, driving the clamping ring to move upward along the hollow rotating shaft and press the elastic clamping head to contract, thereby clamping the copper tube passing through the inside.

[0011] Preferably, the upper end of the stop ring is provided with several sunken grooves, the interior is provided with positioning steps, and the lower end is integrally formed with a protruding portion, the outer wall of the protruding portion is provided with a first screw thread, the clamping ring is screwed on the first screw thread, and the side wall of the clamping ring is provided with an inner screw thread to lock it on the first screw thread, which is used to adjust the clamping force of the elastic clamping head to prevent the copper tube from being clamped.

[0012] Preferably, the elastic clamping head includes a hollow cylindrical body, the end of the cylindrical body is provided with several annular elastic sheets, the end of the elastic sheet is provided with a bevel, and the other end is provided with a boss, the cylindrical body passes through the stop ring, and the boss is pressed on the positioning step.

[0013] Preferably, an annular wedge surface is provided on the inner wall of the clamping ring. When the clamping ring is locked on the first screw thread, the annular wedge surface is pressed against the inclined surface of the elastic sheet, thereby achieving contraction and clamping of multiple elastic sheets.

[0014] Preferably, an end cover is provided at the end of the clamping ring, a through hole is provided on the end cover, and a first elastic member is provided between the end cover and the elastic clamping head, and the first elastic member is used to prevent the two inclined surfaces from being unable to separate after contact and clamping.

[0015] Preferably, a limiting block is sleeved on the hollow rotating shaft on the upper part of the stop ring, and at least one clamping block is provided on the lower part of the limiting block. A pushing cylinder is connected to the limiting block, and the pushing cylinder drives the clamping block of the limiting block to be inserted into the recessed groove to limit the rotation of the stop ring.

[0016] The present invention also provides an automatic copper tube changing device for an electric spark punching machine, comprising a machine platform, a copper tube blanking bin provided on the machine platform, blanking mechanisms provided on the top and bottom of the copper tube bin, a second guide provided on the bottom of the copper tube bin, a through hole provided at the center of the second guide, an oblique guide provided at the end of the through hole, the through hole being used for passing a single copper tube, and after the copper tube passes through, a second sensor is passed to detect whether the copper tube has passed through the second guide;

[0017] A water filling seat is provided below the blanking mechanism at the lower part, a sealing block is provided on the upper part of the water filling seat, and a sealing device is provided inside the sealing block;

[0018] The sealing block and the water injection block are provided with communicating through-holes, and the pull-down assembly pulls the copper tube through the through-holes; the sealing device is used to seal the sealing block and prevent water from leaking from above the water injection block when water is injected into the end of the copper tube;

[0019] The lower part of the water filling seat is provided with the aforementioned rotating clamping device, and a sealing and pressure maintaining component is provided between the water filling seat and the hollow rotating shaft of the rotating clamping device;

[0020] The machine platform is also provided with a pull-down assembly arranged parallel to the copper tube blanking bin, the end of the pull-down assembly extends to the lower part of the rotating clamping device and is connected to a clamping cylinder and a straightening cylinder.

[0021] Preferably, the blanking mechanism includes at least one pushing cylinder, the output end of the pushing cylinder is arranged upward and connected to a grabbing cylinder, and the output end of the grabbing cylinder is located at the top or bottom of the copper tube silo and clamps or releases the copper tube.

[0022] Preferably, the pull-down assembly includes at least two groups of third cylinders or sliding modules that are vertically arranged and continuously arranged.

[0023] Preferably, a processing eye mold is provided on the machine, and a rear flushing device is provided at the lower part of the processing eye mold. The rear flushing device includes a water pipe fixed on the machine, a frame is provided at the end of the water pipe, and positive and negative electrodes are provided at the end of the frame. The lower part of the frame is eccentrically connected to a folding plate through a rotating shaft, and a metal conductor counterweight is provided at the end of the folding plate through a connecting shaft, and the connecting shaft is connected to the central axis position of the metal conductor counterweight.

[0024] Preferably, the sealing device includes a ball valve, which includes a ball valve core and ball valve seats located on both sides of the ball valve core. The ball valve seats and the center of the ball valve core are provided with perforations to facilitate the passage of copper pipes. A rotating cylinder is connected to the ball valve core, and the rotating cylinder extends into the sealing block and is connected to the ball valve core. A second elastic member is provided between the lower ball valve seat and the sealing block, and a first sealing ring is provided between the lower ball valve seat and the water injection seat, and a gasket is provided at the bottom of the first sealing ring.

[0025] Preferably, the sealing and pressure-maintaining assembly includes a first tungsten steel located at the inner end of the water cavity of the water filling seat and a second tungsten steel located at the end of the hollow rotating shaft. The first tungsten steel and the second tungsten steel are arranged in close contact with each other. A second sealing ring is provided on the upper part of the first tungsten steel, a gasket is provided on the upper part of the second sealing ring, a third elastic member is provided on the upper part of the gasket, and the third elastic member is pressed on the top of the water cavity.

[0026] The rotary clamping device and the automatic copper tube changing device of the electric spark punching machine proposed in the present invention have the following beneficial effects: 1. The verticality of the copper tube during the punching process and the speed of the tube lowering are improved, thereby improving the accuracy of the punching; 2. The rotary clamping device can achieve internal watertightness and prevent watertightness during rotation after the copper tube is punched, while at the same time realizing the rotation of the rotating shaft and the clamping and loosening of the copper tube through a single driving power, thereby improving the compactness of the structure; 3. A mechanical sensor and a post-flush device are provided to improve the stability of the punching. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0028] Figure 1 is a three-dimensional schematic diagram of the rotary clamping device of the present invention;

[0029] Figure 2 is a schematic internal perspective view of the rotary clamping device of the present invention;

[0030] Figure 3 An exploded view of the rotary clamping device of the present invention;

[0031] Figure 4 is a schematic diagram of the interior of the stop ring of the present invention;

[0032] Figure 5 is a schematic diagram of the interior of the clamping ring of the present invention;

[0033] Figure 6 is a schematic diagram of the elastic clamping head of the present invention;

[0034] Figure 7 is a schematic diagram of the hollow rotating shaft of the present invention;

[0035] Figure 8 is a schematic diagram of a first guide of the present invention;

[0036] Figure 9 It is a three-dimensional schematic diagram of the automatic copper tube changing device for an electric spark punching machine of the present invention;

[0037] Figure 10 It is a schematic diagram of the assembly of the blanking mechanism and the copper tube blanking bin of the present invention;

[0038] Figure 11 This is an exploded view of the copper tube feeding bin of the present invention;

[0039] Figure 12 An exploded view of the sealing device and the sealing and pressure-maintaining assembly of the present invention;

[0040] Figure 13 is a schematic diagram of a second guide of the present invention;

[0041] Figure 14 is a schematic diagram of another embodiment of the sealing device of the present invention;

[0042] Figure 15 is a schematic internal diagram of another embodiment of the sealing device of the present invention;

[0043] Figure 16 is a schematic diagram of a back flush device of the present invention;

[0044] Figure 17 A cross-sectional view of the automatic copper tube changing device for an electric spark punching machine according to the present invention;

[0045] Figure 18 This is a schematic diagram of the third sensor detecting the position of the copper tube in the present invention;

[0046] Figure 19 This is a schematic diagram of the clamping cylinder of the present invention clamping and pulling down the copper tube;

[0047] Figure 20 This is a schematic diagram of the clamping cylinder of the present invention clamping the copper tube and inserting it into the eye;

[0048] Figure 21 This is a schematic diagram of the copper tube support of the present invention;

[0049] Figure 22 This is a schematic diagram of the present invention where the clamping cylinder grabs the remaining copper tubes after the copper tubes are consumed;

[0050] Among them, 1. hollow rotating shaft; 2. driving assembly; 3. elastic clamping head; 4. stop ring; 5. rubber water stopper; 6. first guide; 7. pressing ring; 8. sunken groove; 9. positioning step; 10. penetration part; 11. cylindrical body; 12. elastic sheet; 13. inclined surface; 14. boss; 15. annular wedge surface; 16. end cover; 17. limiting block; 18. pushing cylinder; 19. clamping block; 20. first gear; 21. second gear; 22. motor; 23. machine; 24. copper tube blanking bin; 25A / 25B, blanking mechanism; 26. second guide; 27. oblique guide; 28. water injection seat; 29. ​​sealing block; 30. pull-down assembly; 31. clamping cylinder; 32. straightening cylinder; 33A / 33B, push-up cylinder; 34A / 34B, grabbing cylinder; 3 5. Processing eye mold; 36. Water pipe; 37. Back flush device; 38. Bearing; 39. Frame; 40. Positive and negative electrodes; 41. Folding plate; 42. Metal conductor counterweight; 43. Ball valve core; 44. Ball valve seat; 45. Rotating cylinder; 46. Second elastic part; 47. First sealing ring; 48. First tungsten steel; 49. Second tungsten steel; 50. Second sealing ring; 51. Third elastic part; 52. Gasket; 53. Water injection pipe; 54. Second screw thread; 55. First elastic part; 56. Internal screw thread; 57. Screw hole; 58. First sensor; 59A / 59B / 59C, second sensor; 60. Third sensor; 61. Rotating shaft; 62. Connecting shaft; 63. Copper tube; 64. Air pipe; 65. First propulsion cylinder; 66. Second propulsion cylinder; 67. Linear rail. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0052] Example 1

[0053] like Figure 1 、 Figure 2 、 Figure 3 As shown, in order to solve the above technical problems, the present invention proposes a rotating clamping device, including a hollow rotating shaft 1, a driving assembly 2 is provided on the outside of the hollow rotating shaft 1 for driving the hollow rotating shaft 1 to rotate; the driving assembly 2 is used to drive the hollow rotating shaft to rotate, specifically: the driving assembly 2 includes a motor 22, the output end of the motor 22 is connected to a first gear 20, the outer wall of the hollow rotating shaft 1 is coaxially integrally formed with a second gear 21, the first gear 20 is meshed with the second gear 21, and the first gear 20 is driven by the motor 22, thereby driving the meshed second gear 21 and the hollow rotating shaft 1 to rotate. Of course, manual rotation is also possible, and a handheld wheel can be provided on the outside of the hollow rotating shaft 1 to facilitate rotation.

[0054] In order to ensure the stability of the rotation of the hollow rotating shaft 1, the first gear 20 and the second gear 21 are provided with positioning blocks outside, and a bearing 38 is provided between the outer wall of the hollow rotating shaft 1 inside the positioning blocks and the positioning blocks to ensure the stable and smooth rotation of the hollow positioning blocks. In order to realize the rotation of the hollow rotating shaft 1, the copper tube must be clamped and loosened. Specifically:

[0055] like Figure 6 As shown, an elastic clamping head 3 is provided at the bottom of the hollow rotating shaft 1, and a stop ring 4 is connected to the outer side of the bottom of the hollow rotating shaft 1 through a thread. The elastic clamping head 3 includes a hollow cylindrical body 11, and a plurality of annular elastic sheets 12 are provided at the end of the cylindrical body 11. The elastic sheet 12 is provided with a deformation groove at the bottom of the cylindrical body 11, and a bevel 13 is provided at the end of the elastic sheet 12. The elastic sheet 12 can be replaced according to the diameter of the copper tube. A boss 14 is provided at the other end of the cylindrical body 11, and the end of the boss 14 is recessed. The cylindrical body 11 passes through the stop ring 4, and the boss 14 is pressed on the positioning step 9, that is, it is arranged in cooperation with the stop ring 4. The elastic clamping head 3 passes through the stop ring 4, and the inner wall of the stop ring 4 is also provided with screw threads. The bottom of the hollow rotating shaft 1 is provided with a second screw thread 54, and the second screw thread 54 is screwed together with the inner wall of the stop ring 4. The stop ring 4 can drive the boss 14 at the end of the elastic clamping head 3 to be pressed tightly against the end of the hollow rotating shaft 1 through the screwing of the second screw thread 54, and a rubber water stopper 5 is provided at the recessed position of the end of the boss 14. A through hole is provided in the center of the rubber water stopper 5 for the copper pipe to pass through. After the rubber water stopper 5 is provided, after the stop ring is tightened, the rubber water stopper 5 is compressed, which can ensure the sealing between the elastic clamping head 3 and the hollow rotating shaft 1, and prevent water leakage when the copper pipe is subsequently filled with water;

[0056] like Figure 4 、 Figure 5As shown, the upper end of the stop ring 4 is provided with a plurality of sunken grooves 8, a positioning step 9 is provided inside, and a protrusion 10 is integrally formed at the lower end. The outer wall of the protrusion 10 is provided with a first screw thread, and the clamping ring 7 is screwed on the first screw thread. The clamping ring 7 and the stop ring 4 are relatively stationary, and the two are matched through the first screw thread. In order to further tighten, an inner screw thread 56 is provided on the side wall of the clamping ring 7 to adjust the clamping force of the elastic clamping head to prevent the copper tube from being clamped, and it is locked on the first screw thread to prevent it from loosening during subsequent rotation. In order to prevent loosening between the clamping ring 7 and the stop ring 4 during subsequent rotation, a screw thread is provided on the outside of the clamping ring 7 The hole 57 is fixed by bolt locking. When the stop ring 4 and the hollow rotating shaft 1 rotate relative to each other, it can move upward or downward along the second thread of the hollow rotating shaft 1. When moving upward, the annular wedge surface 15 of the inner wall of the clamping ring 7 is pressed against the inclined surface 13 of the elastic sheet 12, so that multiple elastic sheets 12 can be contracted and clamped to achieve the clamping of the copper tube. Here, it should be noted that the clamping ring 7 cooperates with the through-hole 10 through the first thread, and the locking position of the clamping ring 7 can be adjusted to ensure the position between the inclined surface 13 of the elastic sheet 12 to prevent the copper tube from being damaged by excessive extrusion, or the copper tube cannot be clamped due to insufficient position and extrusion.

[0057] The function of this rotating clamping device is to clamp the copper tube after it passes through and after the rotation process is completed, it needs to be loosened and replaced with a new copper tube. Since the diameter of the copper tube is very small, it is easy to deviate during perforation. In order to solve this problem, Figure 7 、 Figure 8 As shown, the hollow rotating shaft 1 is internally threadedly connected to a first guide 6, a through hole is provided in the center of the first guide 6, and a tapered hole is provided at the end of the through hole. The guide is connected by a thread, so that different copper tubes and guides of different sizes can be replaced. Of course, it is not limited to a threaded connection, and it can also be a spline connection or a matching connection. The tapered hole of the guide has a guiding effect on the copper tube, so that it is easy to insert into the hole. The guide can also have a smooth outer wall and be matched with the hollow rotating shaft 1, as long as it is ensured that it does not rotate relatively.

[0058] A better stopping method for the stop ring is: a limiting block 17 is sleeved on the hollow rotating shaft 1 on the upper part of the stop ring 4, and at least one clamping block 19 is provided at the lower part of the limiting block 17. A pushing cylinder 18 is connected to the limiting block 17, and the pushing cylinder 18 drives the clamping block 19 of the limiting block 17 to be inserted into the sunken groove 8 to limit the rotation of the stop ring 4. The limiting block 17 is pushed by the pushing cylinder 18. The center of the limiting block 17 is a through hole. It rotates along the hollow rotating shaft 1, and the lower clamping block 19 is stuck in the sunken groove 8, so that the stop ring can be stationary.

[0059] The working method of the rotary clamping device is as follows: after the copper tube passes through the hollow rotating shaft 1, the hollow rotating shaft 1 is driven to rotate by the driving mechanism. At this time, the copper tube has not been clamped yet, and the cylinder 18 is pushed down, so that the limiting block 17 clamps the stop ring. At this time, the stop ring is stationary, and the hollow rotating shaft 1 continues to rotate. The stop ring slowly moves up along the second screw thread, and after driving the clamping block to move up, the clamping block presses the elastic piece 12 to achieve clamping. When the motor 22 cannot rotate, the cylinder 18 is pushed back, and the limiting block 17 is separated from the stop ring. At this time, the stop ring can rotate with the hollow rotating shaft. When the copper tube needs to be replaced after being consumed, it is necessary to loosen the copper tube, and the limiting block 17 presses the stop ring 4 again. The motor 22 drives the rotation, which can drive the stop ring 4 to move downward, and the clamping block releases the elastic piece 12.

[0060] It should be noted that during actual operation, since a rubber water stop 5 is provided between the elastic clamping head 3 and the end of the hollow rotating shaft 1, the normal state is a compressed state. When loosened, the separation stroke of the clamping block is not large. It may happen that after the clamping block is loosened, the end of the elastic clamping head 3 will still fit with the clamping block due to the elasticity of the rubber water stop 5, resulting in the copper tube being loosened in time. Therefore, an end cover 16 is threaded or clamped at the end of the clamping ring 7. A through hole is provided on the end cover 16, and the copper tube can pass through the through hole. A first elastic member 55 is provided between the end cover 16 and the elastic clamping head 3. The first elastic member 55 can be a compressed spring or a rubber ring, etc. When the clamping block is loosened, the first elastic member 55 will push the elastic clamping head 3, so that the elastic clamping head 3 is separated from the clamping block, thereby loosening the copper tube.

[0061] Example 2

[0062] like Figure 9 、 Figure 10 、 Figure 11As shown, the present invention also proposes an automatic copper tube changing device for an electrospark punching machine, comprising a machine platform 23, a lifting module provided on the machine platform 23, a copper tube blanking bin 24 provided on the lifting module, a blanking mechanism 25A provided on the top of the copper tube bin, a blanking mechanism 25B provided on the bottom, a second guide 26 provided on the bottom of the copper tube bin, a through hole provided in the center of the second guide 26, the second guide 26 is a T-shaped structure or a vertical structure, the through hole in the center of which can be passed by a copper tube, and the through hole end The first guide 26 is provided with an oblique guide 27, which is more convenient for passing. The second guide 26 is also replaceable according to the diameter of the copper tube. A plurality of copper tubes are placed in the copper tube silo. The blanking mechanism 25A, 25B includes at least one push cylinder 33A, 33B. The output end of the push cylinder 33A, 33B is upwardly arranged and connected to the grabbing cylinder 34A, 34B. The output end of the grabbing cylinder 34A, 34B is located at the top or bottom of the copper tube silo and clamps or releases the copper tube. The grabbing cylinder here A soft material, such as sponge, is provided between the clamping jaws of 34B to prevent the copper tube from being pinched. The blanking mechanism 25A at the upper part can be provided with two sets of upward pushing cylinders 33A, with the output end facing upward and connected with a connecting plate. A grabbing cylinder 34A is provided on the connecting plate. The grabbing cylinder 34A is located at the top of the copper tube silo. The bundled copper tubes are clamped by the grabbing cylinder 34A and lifted up and released many times. After repeated pulling and releasing, a copper tube will inevitably fall from the through hole of the second guide 26 at the lower part of the copper tube silo, and then pass through the The lower blanking mechanism 25B is pulled downward, and the upper push cylinder 33B of the lower blanking mechanism 25B is fixed on the frame, and the copper tube is clamped by the grabbing cylinder 34B. The lower part of the grabbing cylinder 34B is provided with a first sensor 58 for sensing whether there is a copper tube passing. When the copper tube is sensed, the upper push cylinder 33B moves up and down, and the grabbing cylinder 34B is released after being pulled down to continue to clamp the upper part and pull down, so as to realize the continuous transmission of the copper tube downward until it passes through the water filling seat 28. The third sensor 60 senses that Figure 18 As shown, when the device is perforating, the copper tube is used as an electrode and an electric pulse is applied to the metal to drill a hole. The metal will be melted at high temperature to produce carbon slag, which will clog the copper tube. Therefore, water needs to be injected into the copper tube. Therefore, a water injection seat 28 is provided below the blanking mechanism 25 at the bottom. A sealing block 29 is provided on the upper part of the water injection seat 28. A sealing device is provided inside the sealing block 29. There is a water injection cavity inside the water injection block, which is externally connected to a water injection pipe 53 and a high-pressure pump. Since the diameter of the copper tube is very thin, an external high-pressure water pump is required to inject water. This results in a high sealing requirement for the water injection seat 28. Moreover, since the copper tube needs to pass through the water injection seat 28, a sealing block 29 is provided on the upper part of the water injection seat 28. When the copper tube is continuously pulled down and the top is completely located in the water injection block, the sealing block 29 needs to be sealed. After water is injected into the water injection block, the high pressure causes the water to be discharged from the end of the copper tube. Specifically:

[0063] The sealing device includes a ball valve, which includes a ball valve core 43 and a ball valve seat 44 located on both sides of the ball valve core 43. The ball valve seat 44 and the ball valve core 43 are provided with a perforation in the center to facilitate the passage of the copper tube. The ball valve core 43 is connected to a rotary cylinder 45. Of course, a rotary motor can also be used to drive the ball valve core to rotate. The rotary cylinder 45 extends into the sealing block 29 and is connected to the ball valve core 43. A second elastic member 46 is provided between the lower ball valve seat 44 and the sealing block 29, and is connected to the water injection seat 28. A first sealing ring 47 is provided in between, and a gasket 52 is provided at the lower part of the first sealing ring 47. When the copper tube is passed through, the center perforations of the ball valve core 43 and the ball valve seat 44 are aligned, and the copper tube is pulled through by the upper blanking mechanism 25, and then the ball valve core 43 is driven to rotate by the rotating cylinder 45 to achieve misalignment between the hole of the ball and the ball valve seat 44, that is, to close the hole, and the ball valve seat 44 and the ball valve core 43 are made of polymer materials to ensure that the perforations can still be effectively sealed when subjected to high pressure. The use of the ball valve core 43 for sealing has a better sealing effect and can withstand high pressure.

[0064] Of course, the sealing device can be another embodiment:

[0065] like Figure 14 、 Figure 15 As shown, a hole is provided on the sealing block 29 for the copper tube to pass through, and an insert block is provided in the sealing block 29. The hole on the insert block corresponds to the hole in the sealing block 29. The copper tube passes through the insert block. A cylinder is connected to the insert block. The cylinder pushes the insert block until the hole in the insert block is not aligned with the hole in the sealing block 29, thereby achieving sealing.

[0066] In order to prevent the water filling seat 28 and the sealing block 29, as well as the water filling seat 28 and the rotating clamping device, a sealing pressure maintaining component is also provided. Figure 12 、 Figure 13 As shown, the sealing and pressure-maintaining assembly includes a first tungsten steel 48 located at the end of the water cavity of the water injection seat 28 and a second tungsten steel 49 located at the end of the hollow rotating shaft 1. The first tungsten steel 48 and the second tungsten steel 49 are arranged in close contact. A second sealing ring 50 is provided on the upper part of the first tungsten steel 48, and a gasket 52 is provided on the upper part of the second sealing ring 50. A third elastic member 51 is provided on the upper part of the gasket 52, and the third elastic member 51 is pressed on the top of the water cavity. The first and second elastic members 46 can be springs, which have a buffering effect on the pressure inside the water injection block. The second tungsten steel 49 is provided at the end of the hollow rotating shaft 1 to cooperate with the first tungsten steel 48 in the water injection seat 28. When the second tungsten steel 49 rotates continuously, it can ensure a tighter connection and prevent wear.

[0067] The rotating clamping device connected to the lower part, when the copper tube passes through the rotating clamping device, in order to further improve the transmission speed of the copper tube, the machine 23 is further provided with a pull-down assembly 30 arranged parallel to the copper tube drop bin 24, such as Figure 9 As shown, the end of the pull-down assembly 30 extends to the lower part of the rotating clamping device and is connected to the clamping cylinder 31 and the straightening cylinder 32. The end of the clamping cylinder is connected to the first propulsion cylinder 65, and the end of the straightening cylinder 32 is connected to the second propulsion cylinder 66, which are respectively used to push the clamping cylinder 31 and the straightening cylinder 32 closer to or away from the copper pipe. The pull-down assembly 30 includes at least two groups of continuously arranged third cylinders arranged vertically. In this embodiment, three groups of continuously arranged third cylinders are arranged according to the stroke length. The third cylinder can be pulled down in sections, and in order to ensure the speed of the third cylinder, a linear rail 67 can be set at the connection between the cylinder and the frame. The output end of the third cylinder at the end is connected to the clamping cylinder 31 and the straightening cylinder 32 arranged above and below. A third sensor 60 is provided on the upper part of the straightening cylinder 32 for sensing whether the copper pipe has reached the position shown in FIG. Figure 18 As shown, after the copper tube arrives, the clamping cylinder 31 clamps the copper tube that has just extended out of the rotating clamping device as shown in FIG. Figure 19 As shown, through multiple third cylinders downward, that is, after pulling to the lower eye mold as shown Figure 20 As shown, after the copper tube is clamped by the aforementioned rotating clamping device through the eye mold, the lower metal block can be processed. In addition, three sets of second sensors are set in the vertical position of the machine, namely the second sensor 59A, the second sensor 59B, and the second sensor 59C, which are used to sense the movement position of the rotating clamping device. When it moves to the position of the second sensor 59C, the host controls the sensing rotating clamping device to retreat upward to prevent it from continuously moving downward and causing collision with the lower part. During the processing, the clamping cylinder 31 pulls back and retracts, and the straightening cylinder 32 extends and clamps the copper tube as shown in the figure. Figure 21 As shown, soft material, such as sponge, is provided between the clamping jaws of the straightening cylinder 32 to prevent the copper tube from shaking during the processing due to the long length of the copper tube being pulled out, thereby affecting the processing effect.

[0068] After a certain period of processing, the copper tube will be consumed, and the machine 23 will continue to move downward to ensure that the copper tube contacts the metal. When the length of the copper tube is consumed, the clamping device is controlled to rotate to loosen the copper tube, and the clamping cylinder 31 on the pull-down assembly 30 clamps the copper tube and pulls the remaining copper tube downward. Figure 22 As shown, an air pipe 64 is provided on the clamping cylinder (31), and after the small section of the copper pipe is blown down by air blowing, the copper pipe hopper on the upper part continues to unload the material, and the replacement processing of the copper pipe is carried out.

[0069] Example 3

[0070] It should be noted that in this embodiment, based on Example 2, it often happens that the copper tube has just penetrated the metal block, and the diameter of the copper tube hole has not yet reached the preset value. The machine 23 determines that the hole is completed, and because the water in the copper tube passes downward through the copper tube and is no longer conductive, the machine 23 returns to its original position and stops processing, resulting in this unstable situation. In order to solve this unstable problem, based on Example 2, a back flushing device 37 is provided at the lower part of the eye mold, such as Figure 16 As shown, the rear flushing device 37 includes a water pipe 36 fixed on the machine 23. The water pipe can be a bendable universal tube for easy adjustment of direction. The end of the water pipe 36 is provided with a frame 39 and the end is provided with positive and negative electrodes 40. The frame is made of insulating material to prevent the positive and negative electrodes from conducting. The lower part of the frame 39 is eccentrically connected to a folding plate 41 through a rotating shaft 61. The end of the folding plate 41 is provided with a metal conductor counterweight 42 through a connecting shaft 62. The connecting shaft is connected to the central axis position of the metal conductor counterweight. The metal conductor counterweight is a cylindrical structure. The rotating shaft is eccentric to the axial direction of the metal conductor counterweight. During processing, the water in the copper pipe continuously flows out. When the processed metal part is initially perforated, the water in the copper pipe is It will continue to flow downward. Due to the high-pressure water in the copper tube, it will hit the folding plate 41 and flip down. Due to the eccentric setting of the metal conductor counterweight, when the folding plate 41 is completely flipped down, the metal conductor counterweight 42 moves upward to contact the positive and negative poles to conduct the positive and negative poles. After conduction, the rear flushing device 37 is controlled to flush water to the punching position. At this time, the outside of the copper tube is in contact with the conductive medium again, and processing can continue until the copper tube completely passes through the metal block and meets the perforation requirements, thereby improving the stability of the equipment. When there is no flushing, the metal conductor counterweight will rotate along the rotating shaft. The eccentric setting causes the heavier side to move downward, and then the flip plate 41 connected to the lighter side moves upward. At this time, the metal counterweight 42 is separated from the contact frame of the positive and negative electrodes 40.

Claims

1. A rotary clamping device, characterized in that: comprising a hollow rotating shaft (1), A driving assembly (2) is provided outside the hollow rotating shaft (1) for driving the hollow rotating shaft (1) to rotate; An elastic clamping head (3) is provided at the bottom of the hollow rotating shaft (1), and a stop ring (4) is connected to the outer side of the bottom of the hollow rotating shaft (1) through a thread. The elastic clamping head (3) passes through the stop ring (4), and the end of the elastic clamping head (3) is pressed against the end of the hollow rotating shaft (1) through the stop ring (4). A rubber water stopper (5) is provided between the elastic clamping head (3) and the hollow rotating shaft (1), and a through hole is provided in the center of the rubber water stopper (5) for the copper pipe to pass through. A first guide (6) is connected to the hollow rotating shaft (1), a through hole is provided at the center of the first guide (6), and a tapered hole is provided at the end of the through hole of the first guide (6); The bottom of the stop ring (4) is coaxially connected to a clamping ring (7). When the hollow rotating shaft (1) rotates relative to the stop ring (4), the clamping ring (7) is driven to move upward along the hollow rotating shaft (1) and compress the elastic clamping head (3) to contract, thereby fixing the copper tube passing through the inside. The upper end of the stop ring (4) is provided with a plurality of recessed grooves (8), the interior of which is provided with a positioning step (9), and the lower end is integrally formed with a protruding portion (10), the outer wall of the protruding portion (10) is provided with a first screw thread, the clamping ring (7) is screwed onto the first screw thread, and the side wall of the clamping ring (7) is provided with an inner screw thread to lock it onto the first screw thread, which is used to adjust the clamping force of the elastic clamping head (3) to prevent the copper tube from being clamped; The elastic clamping head (3) comprises a hollow cylindrical body (11), a plurality of annular elastic sheets (12) are provided at the end of the cylindrical body (11), an inclined surface (13) is provided at the end of the elastic sheet (12), and a boss (14) is provided at the other end, the cylindrical body (11) passes through the stop ring (4), and the boss (14) is pressed on the positioning step (9); A limiting block (17) is sleeved on the hollow rotating shaft (1) at the upper portion of the stop ring (4), and at least one clamping block (19) is provided at the lower portion of the limiting block (17). A pushing cylinder (18) is connected to the limiting block (17), and the pushing cylinder (18) drives the clamping block (19) of the limiting block (17) to be inserted into the sunken groove (8) to limit the rotation of the stop ring (4).

2. The rotary clamping device according to claim 1, characterized in that: The inner wall of the clamping ring (7) is provided with an annular wedge surface (15). When the clamping ring (7) is locked on the first screw thread, the annular wedge surface (15) is pressed against the inclined surface (13) of the elastic sheet (12), thereby achieving contraction and tightening of the multiple elastic sheets (12).

3. The rotary clamping device according to claim 1, characterized in that: An end cover (16) is provided at the end of the clamping ring (7), and a through hole is provided on the end cover (16). A first elastic member (55) is provided between the end cover (16) and the elastic clamping head (3), and the first elastic member (55) is used to prevent the two inclined surfaces from being unable to separate after contact and clamping.

4. An automatic copper tube changing device for an electric spark punching machine, comprising a machine platform (23), wherein a copper tube blanking bin (24) is provided on the machine platform (23), characterized in that: The copper tube blanking bin (24) is provided with blanking mechanisms (25A, 25B) at the top and bottom, respectively. A second guide (26) is provided at the bottom of the copper tube blanking bin (24). A through hole is provided at the center of the second guide (26). An oblique guide (27) is provided at the end of the through hole of the second guide (26). The through hole of the second guide (26) is used for a single copper tube to pass through. After the copper tube passes through, a second sensor (58) is used to detect whether the copper tube has passed through the second guide (26). A water injection seat (28) is provided below the lower blanking mechanism (25B), a sealing block (29) is provided on the upper portion of the water injection seat (28), and a sealing device is provided inside the sealing block (29); The sealing block (29) and the water injection seat (28) are provided with communicating through-holes, and the pull-down assembly (30) pulls the copper tube through the through-holes; the sealing device is used to close the sealing block (29) and prevent water from leaking from above the water injection seat (28) when water is injected into the end of the copper tube; The lower part of the water filling seat (28) is provided with a rotating clamping device according to any one of claims 1 to 3, and a sealing pressure maintaining component is provided between the water filling seat (28) and the hollow rotating shaft (1) of the rotating clamping device; The machine platform (23) is also provided with a pull-down assembly (30) arranged parallel to the copper tube blanking bin (24). The end of the pull-down assembly (30) extends to the lower part of the rotating clamping device and is connected to a clamping cylinder (31), a straightening cylinder (32) and a third sensor (60).

5. The automatic copper tube changing device for an electric spark punching machine according to claim 4, characterized in that: The blanking mechanism (25A, 25B) includes at least one upward pushing cylinder (33A, 33B), the output end of the upward pushing cylinder (33A, 33B) is arranged upward and connected to a grabbing cylinder (34A, 34B), and the output end of the grabbing cylinder (34A, 34B) is located at the top or bottom of the copper tube blanking bin (24) and clamps or releases the copper tube.

6. The automatic copper tube changing device for an electric spark punching machine according to claim 4, characterized in that: The pull-down assembly (30) comprises at least two groups of vertically and continuously arranged third cylinders or sliding modules.

7. The automatic copper tube changing device for an electric spark punching machine according to claim 4, characterized in that: The machine (23) is provided with a processing eye mold (35), and the lower part of the processing eye mold (35) is provided with a rear flushing device (37). The rear flushing device (37) includes a water pipe (36) fixed on the machine (23), and the end of the water pipe (36) is provided with a frame (39), and the end of the frame (39) is provided with positive and negative electrodes (40). The lower part of the frame (39) is connected to a folding plate (41) through a rotating shaft (61), and the end of the folding plate (41) is provided with a metal conductor counterweight (42) through a connecting shaft, and the connecting shaft (62) is connected to the central axis position of the metal conductor counterweight (42).

8. The automatic copper tube changing device for an electric spark punching machine according to claim 4, characterized in that: The sealing device includes a ball valve, which includes a ball valve core (43) and a ball valve seat (44) located on both sides of the ball valve core (43). The ball valve seat (44) and the ball valve core (43) are provided with holes in their centers for the copper tube to pass through. The ball valve core (43) is connected to a rotating cylinder (45), which extends into the sealing block (29) and is fixed to the ball valve core (43). A second elastic member (46) is provided between the lower ball valve seat (44) and the sealing block (29), and a first sealing ring (47) is provided between the lower ball valve seat (44) and the water injection seat (28). A gasket (52A) is provided at the lower part of the first sealing ring (47).

9. The automatic copper tube changing device for an electric spark punching machine according to claim 4, characterized in that: The sealing and pressure-maintaining component comprises a first tungsten steel (48) located at the inner end of the water cavity of the water injection seat (28) and a second tungsten steel (49) located at the end of the hollow rotating shaft (1). The first tungsten steel (48) and the second tungsten steel (49) are arranged in close contact with each other. A second sealing ring (50) is provided on the upper part of the first tungsten steel (48), a gasket (52B) is provided on the upper part of the second sealing ring (50), and a third elastic member (51) is provided on the upper part of the gasket (52B). The third elastic member (51) is pressed on the top of the water cavity.

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