A three-edged needle electrical discharge machining rotary indexing device

Abstract

The present invention belongs to the technical field of triangular needle production and processing, and discloses a triangular needle electric discharge machining rotary indexing device, including a fixed seat, a fixed shaft connected to the upper end of the fixed seat, a rotary table and a rotary motor driving the rotary table to rotate along the central axis of the fixed shaft, the fixed shaft passes through the rotary table and is connected to a fixed plate, and at least two needle body clamping mechanisms distributed in a circle are provided on the rotary table. The needle clamping device of the present invention is horizontally rotatably connected to the rotary table, and as the rotary table rotates, the indexing gear connected to the needle clamping device meshes with the fixed fan gear, driving the needle clamping device to accurately rotate 120°, thereby completing the rotary indexing work, and batch indexing can be achieved each time, effectively improving production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of triangular needle production and processing, and in particular relates to a triangular needle electric discharge machining rotary indexing device. Background Art

[0002] When producing and processing medical triangular needles, usually the hollow round stainless steel tube is first cut into a fixed-length needle body, and one end of the needle body is rolled into a closed cone structure using specific processing equipment, and then the end is ground into a triangular cone with three facets. Finally, the three facets are respectively subjected to electric spark discharge drilling to connect them with the cavity inside the needle body for infusion. Before processing, the triangular needle needs to be clamped and fixed, and the first facet is first ground and discharged and punched. After the processing is completed, the needle body is rotated 120° in turn to process the second and third facets. The triangular needle needs to be fixed, clamped and rotated during the processing. The existing production and processing devices can usually only realize the fixing and rotation of a single product, which is not conducive to the batch processing and production of triangular needles, and seriously affects the production efficiency. Therefore, it is urgently needed to provide a triangular needle discharge processing rotation indexing device to facilitate the batch clamping and rotation function of triangular needles, thereby improving production efficiency. Summary of the invention

[0003] In view of the deficiencies in the background technology, the present invention provides a triangular needle electric discharge machining rotary indexing device, which can realize the batch clamping and rotating function of triangular needles, thereby facilitating large-scale product processing and production, and is conducive to improving production efficiency.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A triangular needle electric discharge machining rotary indexing device, characterized in that it includes a fixed seat, a fixed shaft connected to the upper end of the fixed seat, a rotary table and a rotary motor that drives the rotary table to rotate along the central axis of the fixed shaft, the fixed shaft passes through the rotary table and is connected to a fixed plate, and the rotary table is provided with at least two circumferentially distributed needle body clamping mechanisms, each of which includes a clamping seat, a needle clamping device and a dividing gear, the needle clamping device is radially arranged and rotationally connected to the clamping seat, the dividing gear is transmission-connected to one end of the needle clamping device close to the fixed shaft, and cooperates with the fan gear provided on the fixed plate, when the dividing gear of any needle body clamping mechanism rotates with the rotary table and meshes with the fan gear until the two are separated, the needle clamping device rotates 120° driven by the dividing gear.

[0006] Preferably, the needle body clamping mechanisms are arranged in groups, with at least two needle body clamping mechanisms forming a group, and a gap is left between every two adjacent groups of needle body clamping mechanisms.

[0007] Preferably, the needle body clamping mechanism also includes a locking mechanism for fixing the needle clamping device, and the locking mechanism includes a positioning pin, a positioning pin lifting and adjusting device, and a dividing plate arranged on the needle clamping device, the positioning pin is located above the dividing plate and is connected to the positioning pin lifting and adjusting device, the dividing plate is circular, and has three positioning grooves evenly distributed on its outer circumference that can cooperate with the positioning pin.

[0008] Preferably, the positioning pin lifting and adjusting device includes a guide seat, a slider, a bottom plate, a top plate and a guide rod. The guide seat is arranged at the upper end of the clamping seat, and a top plate is provided at its upper end. One side of the slider is slidably connected to the guide seat up and down. The lower end of the slider is connected to the positioning pin, and the upper end is connected to the bottom plate. The lower end of the guide rod is connected to the bottom plate, and the upper end passes through the top plate and is slidably connected to the top plate. A first spring is sleeved on the guide rod, and the first spring is located between the top plate and the bottom plate.

[0009] Preferably, the positioning pin lifting and adjusting device also includes an unlocking mechanism for releasing the fixed restriction of the locking mechanism on the needle clamping device, the unlocking mechanism includes a lever, a support seat, a pressure wheel and a fan-shaped pressure plate with the fixed axis as the central axis, the support seat is connected to the guide seat, the lever is rotatably connected to the support seat through a support shaft, one end of the lever is connected to the base plate, and the other end is rotatably connected to the pressure wheel, the pressure wheel is rollingly engaged with the lower end surface of the convex strip arranged at the outer peripheral edge of the fan-shaped pressure plate.

[0010] Preferably, the lower end surface of the convex strip is located below the fan-shaped pressure plate, and both ends thereof are provided with sloped surfaces that cooperate with the pressure wheel.

[0011] Preferably, one end of the lever close to the bottom plate is rotatably connected to a roller, and the roller is located below the bottom plate and fits with the lower end surface of the bottom plate.

[0012] Preferably, a transmission bracket is provided on the side of the clamping seat close to the fixed axis, and a vertical transmission shaft is rotatably connected to the transmission bracket, one end of the vertical transmission shaft is connected to the indexing gear, and the other end is connected to the first bevel gear, and a horizontal transmission shaft is rotatably connected between the transmission bracket and the clamping seat, one end of the horizontal transmission shaft is connected to the second bevel gear meshing with the first bevel gear, and the other end is connected to a driving wheel, and the driving wheel is connected to the driven wheel provided on the needle clamping device through a synchronous belt.

[0013] Preferably, the needle clamping device includes a jacket and a sleeve arranged outside the jacket, one end of the jacket is a conical structure composed of at least two movable parts with a needle groove in the middle and expanding outward, and a groove is provided between each two adjacent movable parts. The sleeve is a hollow structure opened at both ends, and the inner wall of one end is provided with an inner conical surface matching the conical structure, and the other end is provided with a control component for controlling the expansion and contraction of the conical structure.

[0014] Preferably, the control assembly includes a pull rod, a second spring and a baffle, one end of the pull rod is connected to the sleeve, and the other end passes through the sleeve and is connected to the baffle, the pull rod is sleeved with a second spring, and the second spring is located between the baffle and the end of the sleeve away from the conical structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The needle clamping device of the present invention is horizontally rotatably connected to the rotary table. As the rotary table rotates, the indexing gear connected to the needle clamping device meshes with the fixed fan gear, driving the needle clamping device to accurately rotate 120°, thereby completing the rotary indexing work, and batch indexing can be achieved each time, effectively improving production efficiency;

[0017] (2) The present invention is provided with a locking mechanism to ensure that the needle body will not shake when the needle body is being processed such as grinding and drilling, and the position distribution of the positioning grooves on the indexing plate is consistent with the rotation indexing degree of the needle body, thereby ensuring the processing quality of the product;

[0018] (3) The present invention is provided with an unlocking mechanism, which utilizes the ingenious cooperation of the convex strip, the pressure wheel and the lever to accurately release the locking restriction of the locating pin on the locating groove before each indexing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the structure after removing the fan-shaped pressure plate;

[0022] Figure 3 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0023] Figure 4 It is a schematic diagram of the structure of the needle body clamping mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the indexing plate of the present invention;

[0025] Figure 6 It is a schematic diagram of the locking mechanism structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the connection structure between the locking mechanism and the needle clamping device of the present invention;

[0027] Figure 8It is a schematic cross-sectional view of the needle clamping device of the present invention;

[0028] Fig. 9 This is a schematic diagram of the jacket structure of the present invention;

[0029] Fig.10 It is a schematic diagram of the structure of the fixing plate of the present invention;

[0030] In the figure: 1, fixed seat, 2, fixed shaft, 3, rotary table, 4, fixed plate, 401, circular plate, 402, sector half day, 5, clamping seat, 6, needle clamping device, 601, jacket, 6011, movable part, 6012, needle groove, 6013, groove, 602, sleeve, 6021, inner cone, 7, indexing gear, 8, sector gear, 9, positioning pin, 10, indexing plate, 1001, positioning groove, 11, guide seat, 12, slider, 13, bottom plate, 1 4. top plate, 15. guide rod, 16. first spring, 17. lever, 18. support seat, 19. pressure wheel, 20. fan-shaped pressure plate, 21. support shaft, 22. roller, 23. transmission bracket, 24. vertical transmission shaft, 25. first bevel gear, 26. horizontal transmission shaft, 27. second bevel gear, 28. driving wheel, 29. driven wheel, 30. synchronous belt, 31. pull rod, 32. second spring, 33. baffle, 34. connecting rod, 35. convex strip, 3501. sloped surface. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it is necessary to understand that the terms "middle", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 and Figure 2 As shown, a triangular needle EDM rotary indexing device comprises a fixed seat 1, a fixed shaft 2 connected to the upper end of the fixed seat, a rotary table 3 and a rotary motor (not shown in the figure) for driving the rotary table to rotate along the central axis of the fixed shaft. The fixed shaft is located in the middle of the fixed seat, passes through the rotary table and is connected to a fixed plate 4. The rotary table is provided with at least two needle body clamping mechanisms distributed in a circumference, combined with Figure 3 As shown, each needle body clamping mechanism includes a clamping seat 5, a needle clamping device 6 and a dividing gear 7. The needle clamping device is above the rotary worktable, arranged along its horizontal radial direction and rotatably connected to the clamping seat. The needle body clamped and fixed by the needle clamping device is also arranged radially, and the needle tip part to be processed faces the outside of the rotary worktable. The dividing gear is transmission-connected to one end of the needle clamping device close to the fixed shaft, and cooperates with a fan gear 8 arranged on the outer circumferential surface of the fixed plate. The central axis of the fan gear is the same as the central axis of the rotary worktable. The dividing gear and the fan gear are located on the same horizontal plane. The end of the dividing gear of each needle body clamping mechanism close to the fixed shaft is located on the same circumference. The outer circumferential surface of the fan gear is an arc shape, combined with Fig.10As shown, in this embodiment, the fixed plate is composed of a circular plate body 401 located at the center and a fan-shaped plate body 402 symmetrically arranged on both sides of the circular plate body. Since the fan gear 8 is fixed, and each needle body clamping mechanism can rotate with the rotary table, when any needle body clamping mechanism rotates with the rotary table to the fan gear 8, the fan gear is meshed with the corresponding indexing gear 7 and drives the indexing gear 7 to rotate, and the indexing gear drives the needle clamping device to rotate, thereby realizing the rotation of the needle body on the needle clamping device. The specific rotation degree can be pre-calculated, set and modified according to actual conditions. Since the triangular needle needs to complete the processing of three edges, in this embodiment, from the time when the indexing gear rotates with the rotary table and meshes with the fan gear to the time when the two are separated, the needle clamping device on the needle body clamping mechanism clamps the triangular needle and can achieve 120° rotation. Each needle body clamping mechanism can clamp and fix one triangular needle. In the actual production and processing process, the number of needle body clamping mechanisms can be freely increased according to actual needs to achieve the purpose of mass production, thereby improving production efficiency. In this embodiment, the rotary table is provided with 8 stations, wherein the first station is used for placing the needle on the needle body clamping mechanism (clamping the triangular needle body to be processed on the needle clamping device), the second, fourth and sixth stations are used for grinding the three edges of the needle body, the third, fifth and seventh stations are used for punching the three edges of the needle body, and the eighth station is used for placing the needle on the needle body clamping mechanism (removing the triangular needle after the three edges have been processed), thereby obtaining the final product. The number of fan gears is two, one of which is located between the third and fourth stations, and the other is located between the fifth and sixth stations. The needle body clamping mechanism is arranged in groups, and at least two needle body clamping mechanisms form a group. There is a gap between each two adjacent groups of needle body clamping mechanisms, and the gap is the processing station for grinding and punching the needle body. In this embodiment, the number of needle body clamping mechanisms is 32, and each group of 4 needle body clamping mechanisms can realize the three edges of 4 triangular needles. Processing. First, put the four triangular needles on the first station, then rotate the rotary table to the second and third stations to grind and punch the first edge surface, the rotary table continues to rotate, the fan gear engages with the indexing gear to achieve indexing, and drives the four triangular needles to rotate 120° in sequence to the fourth and fifth stations to grind and punch the second edge surface, the rotary table continues to rotate, another fan gear engages with the indexing gear again to achieve indexing, and drives the four triangular needles to rotate 120° in sequence to the sixth and seventh stations to grind and punch the third edge surface, and finally put the needles on the eighth station, so that the grinding and punching of the three edges of the four triangular needles are completed to obtain the final product. In actual use, as the size of the rotary table is adjusted, the number of each set of needle body clamping mechanisms can change accordingly, and the total number of needle body clamping mechanisms and the number of stations can also change accordingly.

[0035] like Figure 4As shown, a transmission bracket 23 is provided on the side of the clamping seat close to the fixed axis, and a vertical transmission shaft 24 is rotatably connected to the transmission bracket through a bearing, one end of the vertical transmission shaft is connected to a dividing gear, and the other end is connected to a first bevel gear 25, and a horizontal transmission shaft 26 is rotatably connected between the transmission bracket and the clamping seat through a bearing, one end of the horizontal transmission shaft is connected to a second bevel gear 27 meshing with the first bevel gear, and the other end is connected to a driving wheel 28, and the driving wheel is connected to a driven wheel 29 provided on the needle clamping device through a synchronous belt 30. When the dividing gear 7 meshes with the fan gear 8 and rotates, the dividing gear drives the rotation of the first bevel gear 25 below through the vertical transmission shaft 24, and the first bevel gear drives the rotation of the second bevel gear, and the second bevel gear rotates through the horizontal transmission shaft and the driving wheel thereon, and the driving wheel drives the driven wheel 29 to rotate through the synchronous belt 30, thereby driving the rotation of the needle clamping device and the needle body. The horizontal transmission shaft in this embodiment adopts a spline shaft to facilitate the adjustment of the radial position.

[0036] In order to ensure that the needle body will not rotate and shake with the needle body during grinding, drilling and other processing, the needle body clamping mechanism also includes a locking mechanism for fixing the needle clamping device. Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the locking mechanism includes a locating pin 9, a locating pin lifting and adjusting device, and a dividing plate 10 arranged on the needle clamping device. The locating pin is located above the dividing plate and is connected to the locating pin lifting and adjusting device. The dividing plate is circular, and three locating grooves 1001 that can cooperate with the locating pins are evenly distributed on its periphery. The cross-section of the locating groove is V-shaped, and the locating pin is horizontally arranged. When it falls into the locating groove, the dividing plate can be fixed to prevent it from rotating and shaking. At this time, it is convenient to process the edges of the needle body; and when the rotary table rotates, the locating pin needs to be raised first to release the lock on the dividing plate. If there is a slight error in the rotation degree of the needle clamping device during the indexing process, when the locating pin moves downward and falls into the locating groove, the unique structure of the locating groove can be used to achieve correction to ensure the accuracy of the indexing. Figure 6 and Figure 7 As shown, the positioning pin lifting and adjusting device includes a guide seat 11, a slider 12, a base plate 13, a top plate 14 and a guide rod 15. The guide seat is arranged at the upper end of the clamping seat, and a top plate is arranged at the upper end thereof. One side of the slider is connected to the guide seat for sliding up and down. The lower end of the slider is connected to the positioning pin, and the upper end is connected to the base plate. The lower end of the guide rod is connected to the base plate, and the upper end passes through the top plate and is connected to the top plate for sliding. A first spring 16 is sleeved on the guide rod, and the first spring is located between the top plate and the bottom plate. When the guide rod is subjected to an external force and moves upward, the first spring is compressed, and the slider drives the positioning pin to separate from the positioning groove on the dividing plate; when the external force acting upward on the guide rod is eliminated, under the action of the first spring, the slider drives the positioning pin to move downward and embed into the positioning groove on the dividing plate to realize the locking function.

[0037] When the triangular needle body rotates to the fan gear with the rotary table, the needle clamping device needs to drive the needle body to rotate to achieve indexing. At this time, the locking restriction of the positioning pin on the positioning groove needs to be released. Therefore, the positioning pin lifting and adjusting device also includes an unlocking mechanism for releasing the fixing restriction of the locking mechanism on the needle clamping device. Figure 3 , Figure 6 and Figure 7 As shown, the unlocking mechanism includes a lever 17, a support seat 18, a pressure wheel 19 and a fan-shaped pressure plate 20 with a fixed axis as the central axis, the support seat is connected to the guide seat, the lever is rotatably connected to the support seat through a support shaft 21, one end of the lever close to the bottom plate is rotatably connected to a roller 22, the roller is located below the bottom plate and fits with the lower end surface of the bottom plate, the other end of the lever is rotatably connected to the pressure wheel 19, a convex strip 35 is provided at the outer peripheral edge of the fan-shaped pressure plate, the vertical cross-section of the convex strip is L-shaped, the horizontal part of the convex strip fits with the upper end surface of the fan-shaped pressure plate, and the vertical part of the convex strip fits with the circumferential surface of the fan-shaped pressure plate 20, and the lower end surface of the vertical part of the fan-shaped pressure plate is located below the fan-shaped pressure plate. The pressure wheel cooperates with the lower end surface of the convex strip and can roll along its lower end surface. The two ends of the lower end surface of the convex strip are sloped surfaces 3501, which play a transition buffering role. When the needle body clamping mechanism rotates with the rotary table and approaches the fan gear, the pressure wheel rolls to the sloped surface. After it passes through the sloped surface, the convex strip will exert downward pressure on the pressure wheel, overcome the elastic force of the first spring, drive the lever to swing, and the roller at the other end of the lever drives the bottom plate to move upward, so that the positioning pin rises with the slider, the positioning pin disengages from the positioning groove, and the fixed restriction on the needle clamping device is released. Then the indexing gear and the fan gear are meshed to achieve indexing, and the needle clamping device drives the needle body to rotate 120°. In this embodiment, every 4 needle body clamping mechanisms are a group, and each group of needle body clamping mechanisms uses a common pressure wheel. The levers of the 4 needle body clamping mechanisms are connected by a connecting rod 34, and the pressure wheel is rotatably connected to the top of the connecting rod, which can reduce costs. Since two indexings are required during the processing of the triangular needle, two convex strips are provided on the fan-shaped pressure plate.

[0038] like Figure 7 and Figure 8As shown, the needle clamping device includes a jacket 601 and a sleeve 602 disposed outside the jacket. One end of the jacket is a conical structure consisting of at least two movable parts 6011 with a needle groove 6012 in the middle and expanding outward. A groove 6013 is provided between each two adjacent movable parts. The provision of the groove can facilitate the expansion and contraction of the movable part at the end of the jacket. The sleeve is a hollow structure with openings at both ends. The inner diameter of the port at one end is smaller than the outer diameter of the jacket, and an inner conical surface 6021 matching the conical structure is provided on the inner wall of the end, and a control component for controlling the expansion and contraction of the conical structure is provided at the other end. When the jacket moves toward the fixed axis, the movable part is squeezed by the inner conical surface and moves toward the middle, so that the needle body in the needle groove at the center is clamped and fixed; conversely, when the jacket moves toward the side away from the fixed axis, the movable part expands outward under the action of its own elasticity, thereby releasing the clamping of the needle body by the movable part, and the needle body can be taken out of the needle groove. Figure 7 and Figure 8 As shown, the control assembly includes a pull rod 31, a second spring 32 and a baffle 33. One end of the pull rod is connected to the jacket, and the other end passes through the sleeve and is connected to the baffle. The pull rod is sleeved with a second spring, and the second spring is located between the baffle and the end of the sleeve away from the conical structure. In this embodiment, the second spring adopts a disc spring. The position of the baffle on the pull rod can be freely adjusted and can be threaded, so that the second spring can be used to adjust the force balance between the pull rod, the jacket and the sleeve. In this embodiment, a cylinder (mounted on a fixed plate, see Figure 1 ) controls the movement direction of the pull rod. When the pull rod is subjected to an external thrust toward the side away from the fixed axis, the pull rod drives the sleeve to move toward the side away from the sleeve, and the movable part opens to remove the needle body. Conversely, when the external thrust on the pull rod is eliminated, the pull rod, under the action of the second spring, drives the sleeve to move toward the side close to the fixed axis, and the movable part is squeezed by the inner conical surface of the sleeve to clamp the needle body.

[0039] The specific steps of processing the triangular needle by using the present invention are as follows:

[0040] S1, at the first station, use external auxiliary equipment (cylinder or electric push rod) to apply thrust to the pull rods of a group of 4 needle clamping mechanisms corresponding to the first station, so that the movable part of the jacket is opened and the needle body is inserted into the needle groove by the needle loading device, and then stop applying pressure to fix the needle body, completing the needle loading purpose of the first station. At this time, the positioning pin is located in the positioning groove to prevent the needle clamping device from rotating and shaking;

[0041] S2, start the rotary motor to drive the rotary table to rotate, rotate to the second station, and the grinding device at this station grinds the needle body; after the grinding is completed, continue to rotate to the third station, and the punching device at this station punches the first edge surface that has been polished, thus completing the processing of the first edge surface;

[0042] S3, the rotary table continues to rotate. When it approaches the first sector gear, the pressure wheel fits with the sloped surface at one end of the first convex strip on the outer side of the sector-shaped pressure plate, and gradually presses the lever to cause the positioning pin to rise upward, releasing its locking fixation on the indexing plate. The sector gear drives the indexing gear to rotate, and the needle clamping device drives the needle body to rotate 120°. The pressure wheel then passes through the sloped surface at the other end of the convex strip. The lever is reset under the action of the first spring, and the positioning pin is embedded in the positioning groove of the indexing plate again, locking and fixing the needle clamping device, thus completing the first rotation indexing;

[0043] S4, and so on, the rotary table rotates to the 4th and 5th stations to complete the grinding and drilling of the second edge surface respectively;

[0044] S5, same as S3, uses the cooperation between the pressure wheel and the second convex strip to achieve the second rotation indexing;

[0045] S6, the rotary table rotates to the 6th and 7th stations to complete the grinding and drilling of the third edge surface respectively;

[0046] S7, the rotary table rotates to the 8th station, and uses external auxiliary equipment (cylinder or electric push rod) to apply thrust to the pull rods of the 4 needle clamping mechanisms, so that the movable part of the jacket is opened and the needle body is clamped and removed by the air claw, thereby completing the purpose of needle insertion.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A three-edged needle electrical discharge machining rotary indexing device, characterized in that: It includes a fixed seat, a fixed shaft connected to the upper end of the fixed seat, a rotary table and a rotary motor driving the rotary table to rotate along the central axis of the fixed shaft, the fixed shaft passes through the rotary table and is connected to a fixed plate, and at least two needle body clamping mechanisms distributed in a circle are arranged on the rotary table, each of the needle body clamping mechanisms includes a clamping seat, a needle clamping device and a dividing gear, the needle clamping device is radially arranged and rotatably connected to the clamping seat, the dividing gear is transmission-connected to one end of the needle clamping device close to the fixed shaft, and cooperates with the fan gear arranged on the fixed plate, when the dividing gear of any needle body clamping mechanism rotates with the rotary table and meshes with the fan gear until the two are separated, the needle clamping device rotates 120° driven by the dividing gear; The needle body clamping mechanism also includes a locking mechanism for fixing the needle clamping device, the locking mechanism includes a positioning pin, a positioning pin lifting and adjusting device and a dividing plate arranged on the needle clamping device, the positioning pin is located above the dividing plate and connected to the positioning pin lifting and adjusting device, the dividing plate is circular, and three positioning grooves that can be matched and connected with the positioning pin are evenly distributed on its outer circumference; The positioning pin lifting and adjusting device comprises a guide seat, a slider, a bottom plate, a top plate and a guide rod, wherein the guide seat is arranged at the upper end of the clamping seat, and a top plate is arranged at the upper end thereof, one side of the slider is connected to the guide seat for sliding up and down, the lower end of the slider is connected to the positioning pin, and the upper end is connected to the bottom plate, the lower end of the guide rod is connected to the bottom plate, and the upper end passes through the top plate and is slidably connected to the top plate, and a first spring is sleeved on the guide rod, and the first spring is located between the top plate and the bottom plate; The positioning pin lifting and adjusting device also includes an unlocking mechanism for releasing the fixed restriction of the locking mechanism on the clamping device. The unlocking mechanism includes a lever, a support seat, a pressure wheel and a fan-shaped pressure plate with the fixed axis as the central axis. The support seat is connected to the guide seat, and the lever is rotatably connected to the support seat through a support shaft. One end of the lever is connected to the base plate, and the other end is rotatably connected to the pressure wheel. The pressure wheel rolls with the lower end surface of the convex strip arranged at the outer peripheral edge of the fan-shaped pressure plate.

2. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 1, characterized in that: The needle body clamping mechanisms are arranged in groups, with at least two needle body clamping mechanisms forming a group, and a gap is left between each two adjacent groups of needle body clamping mechanisms.

3. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 1, characterized in that: The lower end surface of the convex strip is located below the fan-shaped pressing plate, and both ends thereof are provided with sloped surfaces that cooperate with the pressing wheel.

4. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 1, characterized in that: One end of the lever close to the bottom plate is rotatably connected with a roller, and the roller is located below the bottom plate and fits with the lower end surface of the bottom plate.

5. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 1, characterized in that: A transmission bracket is provided on one side of the clamping seat close to the fixed axis, and a vertical transmission shaft is rotatably connected to the transmission bracket. One end of the vertical transmission shaft is connected to a dividing gear, and the other end is connected to a first bevel gear. A horizontal transmission shaft is rotatably connected between the transmission bracket and the clamping seat, one end of the horizontal transmission shaft is connected to a second bevel gear meshing with the first bevel gear, and the other end is connected to a driving wheel. The driving wheel is connected to a driven wheel provided on the needle clamping device through a synchronous belt.

6. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 1, characterized in that: The needle clamping device includes a jacket and a sleeve arranged outside the jacket. One end of the jacket is a conical structure composed of at least two movable parts with a needle groove in the middle and expanding outward. A groove is provided between each two adjacent movable parts. The sleeve is a hollow structure with openings at both ends. The inner wall of one end is provided with an inner conical surface matching the conical structure, and the other end is provided with a control component for controlling the expansion and contraction of the conical structure.

7. A triangular needle electrical discharge machining rotary indexing device as claimed in claim 6, characterized in that: The control assembly includes a pull rod, a second spring and a baffle. One end of the pull rod is connected to the jacket, and the other end passes through the sleeve and is connected to the baffle. The pull rod is sleeved with a second spring, which is located between the baffle and the end of the sleeve away from the conical structure.

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