Die stroke rod with rotation angle positioning function

Abstract

The invention relates to the technical field of stamping dies, and discloses a die stroke rod with a rotation angle positioning function, the die stroke rod comprises a sleeve rod, the circumferential outer surface of the sleeve rod is provided with a groove group, and the inner wall surface of the sleeve rod is embedded with a rack; the ejector rod is connected to the interior of the circumference of the sleeve rod in a sliding mode, the movable cavity is formed in the ejector rod, and the rotating piece is arranged in the ejector rod. The mold stroke rod with the rotation angle positioning function can effectively solve the problems that in the prior art, for machining of a large round thin workpiece, when the round thin workpiece is stamped and demolded, the round thin workpiece closely attached to the surface of a mold is prone to clamping stagnation, and the machining precision of the large round thin workpiece is affected. The problems that a common ejector rod needs large ejection force to eject out a workpiece, the ejection force cannot be evenly distributed, the workpiece deforms due to the fact that local stress of the workpiece is too large, and then the rejection rate is increased are solved.

Description

Technical Field

[0001] The invention relates to the technical field of stamping dies, and in particular to a die travel rod with a rotation angle positioning function. Background Art

[0002] The mold travel rod, also often called the mold ejector rod or ejector pin, is an important component in the mold structure. It is mainly used to push the molded workpiece out of the mold cavity after the molding process such as stamping or injection molding is completed, so that it can be demolded smoothly. One end of the travel rod is connected to the ejection mechanism of the mold, and the other end extends into the mold cavity to contact the workpiece. The travel rod applies an ejection force to overcome the adhesion and friction between the workpiece and the mold cavity, so that the workpiece can be separated from the mold, which is convenient for subsequent removal and sorting processes.

[0003] In the prior art, for the processing of larger round thin workpieces, when the round thin workpiece is stamped and demolded, the round thin workpiece that fits closely with the mold surface is prone to getting stuck. Ordinary ejector pins require a large ejection force to eject the workpiece, and the ejection force cannot be evenly distributed, causing the workpiece to be locally subjected to excessive force and deformed, thereby increasing the scrap rate. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a mold travel rod with a rotation angle positioning function, which can effectively solve the problem in the prior art that, for the processing of larger circular thin workpieces, when the circular thin workpiece is stamped and demolded, the circular thin workpiece that fits closely with the mold surface is prone to sticking, and ordinary ejector rods require a large ejection force to eject the workpiece, and the ejection force cannot be evenly distributed, resulting in excessive local force on the workpiece and deformation, thereby increasing the scrap rate.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a mold travel rod with a rotation angle positioning function, comprising: A sleeve rod, wherein a groove group is formed on the outer circumferential surface of the sleeve rod, and a rack is embedded on the inner wall surface of the sleeve rod; A push rod is slidably connected to the inner circumference of the sleeve rod, a movable cavity is provided inside the push rod, and a rotating member is arranged inside the push rod; Among them, the rotating part includes a roller and a gear which are respectively rotatably connected to one side of the inner wall of the movable cavity, the circumferential outer surface of the gear is meshed with the outer surface of the rack, the roller and the gear are distributed in sequence from top to bottom, the outer side of the roller is rotatably connected with a vertical connecting rod, and the end of the vertical connecting rod away from the roller is rotatably connected to the outer side of the gear, which is used to drive the roller to move in a circle, and the highest point of the circumferential outer surface of the roller is higher than the top of the ejector rod, which is used to lift the stamping workpiece inside the mold cavity.

[0006] Furthermore, the push rod is slidably connected to the inner wall surface of the groove group through a limit block fixed on the outer surface of its circumference, the bottom end of the push rod is connected to a spring, and the upper surface of the push rod is provided with a lifting member.

[0007] Furthermore, the circumferential outer surface of the limit block is fixedly connected to a base that slides with the outer surface of the sleeve rod, the end of the spring away from the push rod is connected to a push plate fixedly connected to the lower surface of the base, the base is provided with multiple and distributed in a circular array on the upper surface of the push plate, and the axis line of the roller coincides with the normal of the circular workpiece.

[0008] Furthermore, the groove group includes a first slide groove and a second slide groove, the first slide groove and the second slide groove are distributed at equal intervals, the first slide groove and the second slide groove are parallel, the circumferential outer surface of the sleeve rod is provided with a slide rail connected to the interior of the first slide groove, the second slide groove is connected to the interior of the slide rail, and the bottom of the inner wall of the slide rail is on the same horizontal plane as the bottom of the inner wall of the groove group.

[0009] Furthermore, a magnetic block is slidably fitted on the inner wall surface of the slide rail, and two magnetic blocks are arranged inside each group of the slide rails, and the two magnetic blocks are symmetrically distributed on both sides of the limit block.

[0010] Furthermore, the outer side of the limit block adopts a magnetic design which is magnetically connected to the outer surface of the magnetic block.

[0011] Furthermore, the lifting member includes a guide rod sliding inside the top rod, the top end of the guide rod extends to the upper surface of the top rod and is fixedly connected to a lifting block, the lifting block is rotatably connected to a rotating plate via a universal joint arranged above it, the lower surface of the lifting block is rotatably connected to a rotating plate, and the side of the rotating plate away from the lifting block is rotatably connected to a connecting plate connected to the upper surface of the top rod.

[0012] Furthermore, the guide rod is slidably connected with a protrusion through a movable groove provided on its circumferential outer surface, and an elastic member connected to the inner wall of the movable groove is provided on the side of the protrusion close to the guide rod, and a pressure plate is fixedly connected to the circumferential inner wall of the sleeve rod.

[0013] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with a sleeve rod, a push rod and a rotating part. When the sleeve rod and the push rod slide relative to each other, the internal gear can mesh with the outer surface of the rack embedded in the inner wall of the sleeve rod, driving the gear to perform meshing rotation in a circumferential direction. When the gear rotates around the rotating shaft under the action of the rack, the gear drives the upper roller to rotate synchronously through the vertical connecting rod on the outer surface. After the roller contacts the lower surface of the workpiece, it still keeps a state of rotating and rising. The axis center line of the roller coincides with the normal line of the push plate. During the rolling demolding process, the roller can apply force perpendicular to the surface of the workpiece to ensure uniform force transmission, thereby further improving the uniformity of force on the workpiece. The contact points between the outer surface of the roller circumference and the outer surface of the workpiece are constantly changing, giving the circular stamping workpiece a force to rotate inside the mold cavity. Under the action of the roller that rises and rotates at the same time, the circular workpiece also rotates and rises at the same time. The rotation direction of the circular workpiece is perpendicular to the rotation direction of the roller. During the rising process, the roller can transmit a more uniform demoulding force to each contact point of the circular workpiece, and disperse the ejection force to a wider area, avoiding the risk of deformation or damage on the workpiece surface due to local stress concentration and uneven force, ensuring that the workpiece maintains good dimensional accuracy during the demoulding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of a push plate according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the separation structure of the sleeve rod, the push rod, the spring and the lifting member in the embodiment of the present invention; Figure 4 It is a structural schematic diagram of a top rod according to an embodiment of the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the ejector rod according to an embodiment of the present invention; Figure 6 is a cross-sectional view of a sleeve rod according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the slide rail and the magnetic block according to an embodiment of the present invention; Figure 8 It is a schematic cross-sectional structure diagram of the sleeve rod at another angle according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of the structure of a lifting member according to an embodiment of the present invention; Fig.10 This is a distribution diagram of rollers on an external circular workpiece according to an embodiment of the present invention.

[0016] The numbers in the figure represent respectively: 1. sleeve rod; 11. slot group; 111. first slide slot; 112. second slide slot; 12. rack; 13. slide rail; 131. magnetic block; 2. push rod; 21. movable cavity; 22. rotating part; 221. roller; 222. gear; 223. vertical connecting rod; 23. limit block; 24. spring; 25. lifting part; 251. guide rod; 252. lifting block; 253. rotating plate; 254. rotating plate; 255. connecting plate; 256. protrusion; 257. elastic part; 258. pressure plate; 3. base; 31. pushing plate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention will be further described below in conjunction with the embodiments.

[0019] Example:

[0020] See also Figure 1-Figure 10 The present invention provides a technical solution: a mold travel rod with a rotation angle positioning function, comprising: The sleeve rod 1 has a groove group 11 on its circumferential outer surface, and a rack 12 is embedded on its inner wall surface; a certain gap is left between the rack 12 and the sleeve rod 1.

[0021] A push rod 2 is slidably connected to the inner circumference of the sleeve rod 1, a movable cavity 21 is provided inside the push rod 2, and a rotating member 22 is arranged inside the push rod 2; Among them, the rotating part 22 includes a roller 221 and a gear 222 which are respectively rotatably connected to one side of the inner wall of the movable cavity 21. The circumferential outer surface of the gear 222 is meshed with the outer surface of the rack 12. The roller 221 and the gear 222 are distributed in sequence from top to bottom. The outer side of the roller 221 is rotatably connected with a vertical connecting rod 223. The end of the vertical connecting rod 223 away from the roller 221 is rotatably connected with the outer side of the gear 222, which is used to drive the roller 221 to move in a circle. In the initial state, the highest point of the circumferential outer surface of the roller 221 is higher than the top of the ejector rod 2, which is used to lift the stamping workpiece inside the mold cavity.

[0022] The push rod 2 is slidably connected to the inner wall surface of the groove group 11 through a limit block 23 fixed on the outer surface of its circumference. A spring 24 is connected to the bottom end of the push rod 2, and a lifting member 25 is provided on the upper surface of the push rod 2.

[0023] The circumferential outer surface of the limit block 23 is fixedly connected to a base 3 that slides with the outer surface of the sleeve rod 1. The end of the spring 24 away from the push rod 2 is connected to a push plate 31 that is fixedly connected to the lower surface of the base 3. The base 3 is provided with multiple push plates 31 distributed in a circular array on the upper surface of the push plate 31. The axis line of the roller 221 coincides with the normal of the circular workpiece, and the height of the base 3 is much greater than the height of the sleeve rod 1.

[0024] The slot group 11 includes a first slide slot 111 and a second slide slot 112. The first slide slot 111 and the second slide slot 112 are distributed at equal intervals. The first slide slot 111 and the second slide slot 112 are parallel. The circumferential outer surface of the sleeve rod 1 is provided with a slide rail 13 connected to the interior of the first slide slot 111. The second slide slot 112 is connected to the interior of the slide rail 13. The bottom of the inner wall of the slide rail 13 is in the same horizontal plane as the bottom of the inner wall of the slot group 11.

[0025] The inner wall surface of the slide rail 13 is fitted with a magnetic block 131 for sliding. The slide rail 13 is provided with two groups and is distributed in a circular array around the central axis of the push rod 2. Two magnetic blocks 131 are arranged inside each group of slide rails 13, and the two magnetic blocks 131 are symmetrically distributed on both sides of the limit block 23.

[0026] The outer side of the limit block 23 adopts a magnetic design that is magnetically connected to the outer surface of the magnetic block 131.

[0027] The lifting member 25 includes a guide rod 251 sliding inside the top rod 2. The top end of the guide rod 251 extends to the upper surface of the top rod 2 and is fixedly connected to a lifting block 252. The lifting block 252 is rotatably connected to a rotating plate 253 through a universal joint arranged above it. The lower surface of the lifting block 252 is rotatably connected to a rotating plate 254. The side of the rotating plate 254 away from the lifting block 252 is rotatably connected to a connecting plate 255 connected to the upper surface of the top rod 2. A rail groove is provided on the outer surface of the top rod 2. The angle between the two rail grooves is 45 degrees. In the initial state, the pressure plate 258 is located above one of the rail grooves; after the sleeve rod 1 rotates 45 degrees, the pressure plate 258 is located above the other rail groove; when the top rod 2 and the sleeve rod 1 slide relative to each other, the pressure plate 258 is located inside the rail groove. The top of the rail groove adopts a cone design to play a guiding role.

[0028] The guide rod 251 is slidably connected to a protrusion 256 through a movable groove provided on its outer circumferential surface. An elastic member 257 connected to the inner wall of the movable groove is provided on the side of the protrusion 256 close to the guide rod 251. A pressing plate 258 is fixedly connected to the inner wall of the circumferential surface of the sleeve rod 1. The outer circumferential surface of the roller 221 is made of rubber material to increase the friction with the surface of the workpiece.

[0029] The process of cutting round thin workpieces: In actual applications, thin sheet materials can be punched into the required circular workpieces through the cooperation of the upper and lower molds. During the punching process, the workpiece will undergo elastic deformation. After the punching pressure disappears, the material returns to its original shape. The friction between the edge and the mold cavity wall will prevent the elastic recovery of the material, causing the workpiece to fit tightly with the cavity. In particular, after the larger circular thin workpiece is punched, it is easy to get stuck inside the mold cavity and it is not easy to remove the material. In this scenario, the pressure of the traditional stroke push rod where the surface of the punched workpiece contacts the push rod is greater than other places, which is easy to cause deformation of the workpiece surface.

[0030] Taking the stroke rod inside the lower die seat as an example, in the initial state, the push plate 31 is located at the bottom, and its lower surface is connected to the ejection mechanism, and the spring 24 inside the base 3 is in an extended state. The limit block 23 fixes the base 3 and the ejector 2 into a whole, and the upper surface of the limit block 23 is flush with the upper surface of the base 3, and the lower surface of the limit block 23 is flush with the lower surface of the ejector 2. Under the lifting action of the spring 24, the sleeve rod 1 is at the highest point within its travel range, and the upper surface of the sleeve rod 1 fits with the outer surface of the mold cavity. A through hole is opened in the middle position of the sleeve rod 1 inside the mold for the ejector 2 to slide and connect inside the mold. The lower surface of the inner wall of the sleeve rod 1 fits tightly with the lower surface of the ejector 2, and the ejector 2 is completely hidden inside the sleeve rod 1. The lower surface of the lifting block 252 is at a certain distance from the upper surface of the push rod 2. The angle between the rotating plate 254 and the connecting plate 255 is small and inclined toward the side of the pressure plate 258. The lower surface of the pressure plate 258 is slightly higher than the upper surface of the push rod 2. The highest point of the roller 221 is higher than the upper surface of the rotating plate 253 and also higher than the highest point of the top of the push rod 2.

[0031] Taking the groove group 11 near the side of the vertical connecting rod 223 as an example, the stopper 23 on the outer surface of the circumference of the push rod 2 slides inside the first slide groove 111, and the gear 222 inside the push rod 2 can mesh with the rack 12 embedded in the inner wall of the sleeve rod 1. From the vertical direction, the symmetry axis of the first slide groove 111 and the symmetry axis of the stopper 23 are the same axis, the symmetry axis of the rack 12 and the symmetry axis of the first slide groove 111 form a 45-degree angle, the symmetry axis of the first slide groove 111 and the symmetry axis of the second slide groove 112 form a 45-degree angle, and the symmetry axis of the rack 12 and the symmetry axis of the second slide groove 112 form a 90-degree angle.

[0032] After the stamping is completed, the ejection mechanism below drives the push plate 31 to move upward, and the distance between the upper surface of the push plate 31 and the lower surface of the mold gradually decreases. During this process, the upper surface of the sleeve rod 1 is tightly fitted with the lower surface of the mold cavity, and the spring 24 between the sleeve rod 1 and the push plate 31 is compressed, and a relative displacement occurs between the sleeve rod 1 and the ejector 2. The position of the sleeve rod 1 remains unchanged, and the ejector 2 slides upward on the inner wall of the sleeve rod 1. During this process, the limit block 23 on the outer surface of the ejector 2 is on the inner wall of the first slide groove 111, and the gear 222 in the active cavity 21 is meshed with the rack 12 on the inner wall of the sleeve rod 1. When the sleeve rod 1 and the ejector 2 are relatively displaced, the positions of the gear 222 and the rack 12 also change relatively, and the gear 222 rotates during the upward lifting process. The gear 222 and the roller 221 are both rotatably connected to the same side wall of the movable cavity 21 through a shaft, wherein the gear 222 is located at a lower position inside the push rod 2, and the roller 221 is located at an upper position inside the push rod 2. The highest point of the outer surface of the roller 221 is higher than the upper surface of the push rod 2, and can directly contact the circular stamping workpiece. The top end of the vertical connecting rod 223 is rotatably connected to the outer surface of the roller 221, and the bottom end is rotatably connected to the outer surface of the gear 222. The vertical connecting rod 223 always maintains a vertical state, and the straight line formed by the center points of the gear 222 and the roller 221 is parallel to the vertical connecting rod 223.

[0033] When the gear 222 rotates around the rotating shaft under the action of the rack 12, the gear 222 drives the roller 221 above to rotate synchronously through the vertical connecting rod 223 on the outer surface. Therefore, during the demoulding process, the sleeve rod 1 is relatively stationary, while the ejector rod 2 and the base 3 move synchronously into the mold cavity. During the movement, the ejector rod 2 moves upward relative to the sleeve rod 1 until the roller 221 protrudes from the upper surface of the sleeve rod 1 and extends to the inside of the mold cavity, until the outer surface of the roller 221 contacts the lower surface of the stamped workpiece. During the upward movement of the ejector rod 2, the roller 221 moves upward with the ejector rod 2, and rotates under the action of the gear 222, and the whole presents a state of rising and rotating at the same time. Since there are multiple sleeve rods 1, ejector rods 2 and bases 3, they are arranged in a circular array with the axis of the circular mold as the center, and the axis of the rollers 221 inside each set of ejector rods 2 can pass through the axis of the push plate 31, and the straight line perpendicular to the axis of the rollers 221 is parallel to the tangent of the circular workpiece. The multiple rollers 221 rotate in the same direction, so that the friction force on the circular workpiece during the demoulding process is consistent in direction, so that in the circumferential direction where the workpiece contacts the rollers 221, the friction forces are superimposed on each other and in a unified direction, which is more conducive to smoothly ejecting the workpiece from the mold, further reducing the overall demoulding resistance, reducing the force required for ejection, helping to protect the workpiece and the mold, and reducing energy consumption.

[0034] After the roller 221 contacts the lower surface of the workpiece, it still keeps rotating and rising. The axis of the roller 221 coincides with the normal of the push plate 31. During the rolling demolding process, the roller 221 can apply force perpendicular to the surface of the workpiece to ensure uniform force transmission, further improving the uniformity of the force on the workpiece. Multiple ejector rods 2 work together to smoothly eject the circular workpiece from the mold with the rolling of the roller 221. Even for circular workpieces with larger sizes and thinner walls, their stability and uniformity during the demolding process can be guaranteed. The roller 221 forms rolling friction with the lower surface of the workpiece. Compared with sliding friction, rolling friction makes the ejection process smoother and reduces the force required for ejection.

[0035] Since the outer surface of the roller 221 is made of rubber material, the friction is relatively large. Fig.10 As shown, the outer surface of the roller 221 is perpendicular to the normal direction of the push plate 31, which drives the circular workpiece to rotate inside the mold cavity. The contact point between the outer surface of the roller 221 and the outer surface of the workpiece is constantly changing, giving the circular stamping workpiece a force to rotate inside the mold cavity. The roller 221 can transmit a more uniform demoulding force to each contact point of the circular workpiece during the rising process, dispersing the ejection force to a wider area, avoiding the risk of deformation or damage caused by local stress concentration and uneven force on the workpiece surface, and ensuring that the workpiece maintains good dimensional accuracy during the demoulding process. It can also reduce the risk of cracks or ruptures in some high-strength, crack-prone circular workpieces during the demoulding process.

[0036] Reset process after demoulding: The circular workpiece rotates and rises inside the mold cavity under the action of the ejector 2 until it is completely separated from the inner wall of the mold cavity. At this time, the spring 24 is also in a fully compressed state, the limit block 23 is in the upper position inside the first slide groove 111, the lower surface of the sleeve rod 1 is close to the lower surface of the push plate 31, the ejection mechanism drives the push plate 31 to reset downward, the distance between the lower surface of the mold and the push plate 31 gradually increases, the upper surface of the sleeve rod 1 always fits with the lower surface of the mold, the sleeve rod 1 keeps this position fixed, the base 3 and the ejector 2 slide downward under the action of the push plate 31, the distance between the lower surface of the sleeve rod 1 and the upper surface of the push plate 31 gradually increases, and the spring 24 set inside the circumference of the base 3 also gradually restores the elastic potential energy until the lower surface of the inner wall of the sleeve rod 1 fits with the lower end of the ejector 2, and the sleeve rod 1, the ejector 2 and the base 3 all return to their initial state.

[0037] Demolding process for non-circular workpieces: For complex stamping dies, there will be circular workpieces and other parts with stamping shapes involved. Some special stamping processes, such as compound stamping and continuous stamping, require processing workpieces of multiple shapes in the same mold at the same time. In these processes, in order to ensure the molding quality of the workpiece and the continuity of production, a travel push rod system that can adapt to the demolding requirements of various workpieces is required. In this case, the base 3, the sleeve rod 1 and the push rod 2 can be used separately as required, without the need for multiple circular arrays. The lower surface of the base 3 is fixedly mounted above the push plate 31, and the base 3 is fixedly connected to the push rod 2 through the limit block 23. At this time, the limit block 23 is at the junction of the first slide groove 111 and the slide rail 13, and the sleeve rod 1 is rotated forty-five degrees clockwise on the circumferential outer surface of the top rod 2 (the sleeve rod 1 is affected by the bottom spring 24 and is subject to a certain resistance when rotating. At the same time, stability is guaranteed to prevent the sleeve rod 1 from automatically rotating due to stamping shaking). The base 3, the limit block 23 and the top rod 2 are all fixed, and the magnetic block 131 is affected by the magnetic force and is always on both sides of the limit block 23 and does not rotate. Only the sleeve rod 1 produces relative rotational motion. After rotating forty-five degrees, the side edge of one of the magnetic blocks 131 fits against the inner wall side of the slide rail 13, and the other side edge slightly protrudes from the inner wall surface of the second slide groove 112; the side edge of the other magnetic block 131 is flush with the inner wall surface of the first slide groove 111, and the other side edge slightly protrudes from the inner wall surface of the second slide groove 112. The arc length of the limit block 23 away from the axis of the ejector rod 2 is smaller than the arc length of the groove group 11 on the outside, thereby avoiding the damage of the stroke rod due to the jamming of the sleeve rod 1 and the ejector rod 2 during the demolding process, thereby ensuring the stability of operation.

[0038] Regardless of the demoulding situation, the limit block 23 slides in any slot group 11, and there are magnetic blocks 131 between the adjacent positions of the first slide slot 111 and the second slide slot 112 and at the intersection with the inside of the slide rail 13, which support the sleeve rod 1 structure and ensure the strength and stability of the sleeve rod 1 structure. After the sleeve rod 1 rotates, the rack 12 embedded inside it also synchronously completes a 45-degree rotation. The bottom side of the rack 12 is a certain distance from the lower surface of the active cavity 21, which can ensure that when the sleeve rod 1 rotates, the internal rack 12 will not collide with the gear 222.

[0039] At the same time, when the sleeve rod 1 rotates, the pressure plate 258 on its inner wall will move synchronously (a rail groove is provided on the outer surface of the top rod 2, and the angle between the two rail grooves is forty-five degrees. In the initial state, the pressure plate 258 is above one of the rail grooves; after the sleeve rod 1 rotates forty-five degrees, the pressure plate 258 is above the other rail groove; when the top rod 2 and the sleeve rod 1 slide relative to each other, the pressure plate 258 is inside the rail groove. The top of the rail groove adopts a cone-shaped design to play a guiding role). During the clockwise rotation of forty-five degrees, the outer surface of the pressure plate 258 fits against the hinge of the connecting plate 255 and the rotating plate 254, and pushes the connecting plate 255 and the rotating plate 254 from an inclined state to a vertical state. During the rotation of the connecting plate 255 and the rotating plate 254, the lifting block 252 is pushed upward, and the guide rod 251 moves upward synchronously (the bottom end of the guide rod 251 is always inside the top rod 2). The protrusion 256 moves upward from the inside of the push rod 2 until the angle between the connecting plate 255 and the rotating plate 254 is converted to one hundred and eighty degrees. At this time, the limit block 23 enters the inside of the second slide groove 112, and the lifting block 252 is at the highest point within its travel range. The protrusion 256 is stretched outward by the action of the elastic member 257 (the elastic member 257 preferably adopts a compression spring or a leaf spring), and the lowest point of its circumferential outer surface is in contact with the upper surface of the push rod 2, fixing the lifting block 252 at this height (in this state, the upper surface of the lifting block 252 is higher than the highest point of the roller 221).

[0040] After the stamping is completed, the ejection mechanism below drives the push plate 31 to move upward, and the base 3 and the ejector 2 move upward with the push plate 31. The bottom of the mold is parallel to the push plate 31, and the lower surface of the inner wall of the cavity is in an inclined state. When moving upward, the pressure plate 258 is inside a rail groove, the top of the sleeve rod 1 fits with the lower surface of the mold, and the ejector 2 passes through the slot of the mold and enters the cavity. Since the upper surfaces of the lifting block 252 and the rotating plate 253 are higher than the highest point of the roller 221 at this time, the upper surface of the rotating plate 253 will first contact the lower surface of the workpiece. After the rotating plate 253 contacts the lower surface of the workpiece, the ejector 2 continues to lift, driving the rotating plate 253 to rotate under the action of the universal joint. The upper surface of the rotating plate 253 is completely in contact with the lower surface of the workpiece, which is suitable for demolding and lifting workpieces within a certain range, with different tilt directions and tilt angles. The rotating plate 253 can automatically adjust its posture according to the specific shape and inclination angle of the lower surface of the workpiece and fit closely to the surface of the workpiece. No matter the lower surface of the workpiece is a regular inclined surface or a complex irregular curved surface, it can provide effective support and ejection effect, which greatly improves the versatility of the mold for different types of workpieces and reduces the need to design a variety of special stroke push rods or molds due to differences in workpiece shapes.

[0041] After demolding is completed, the sleeve rod 1 is restored to its original state. When it is rotated forty-five degrees counterclockwise, the pressure plate 258 rotates counterclockwise synchronously from the top of one of the rail grooves. The side of the pressure plate 258 away from the rotating plate 254 collides with the outer surface of the protrusion 256, and the protrusion 256 is squeezed toward the inside of the guide rod 251. The rotating plate 254 and the connecting plate 255 begin to rotate under the influence of the gravity of the lifting block 252, and the angle between the two gradually decreases until the initial state is restored. The guide rod 251 drives the lifting block 252 to slide toward the inside of the push rod 2, and finally restores to the point where the upper surface of the pressure plate 258 is lower than the highest point of the roller 221.

[0042] In summary, the stroke push rod has the following advantages: Advantage 1: The double-layer design is adopted. The top of the sleeve rod 1 is connected to the outer surface of the mold cavity to play a guiding role. It can not only handle the demoulding of large circular thin-material workpieces, but also is suitable for demoulding of non-circular workpieces with inclined lower surfaces or complex shapes. For circular workpieces, the limit block 23 is inside the first slide groove 111. When lifting in this state, the highest point of the roller 221 is higher than the top of the ejector rod 2 and the upper surface of the rotating plate 253, and the roller 221 directly contacts the surface of the workpiece; for non-circular workpieces, by rotating the sleeve rod 1 and other operations, the limit block 23 is inside the second slide groove 112, and the components in the lifting member 25 are used to make the upper surface of the rotating plate 253 higher than the highest point of the roller 221. The roller 221 does not contact the surface of the workpiece, avoiding wrinkles, deformation, etc. caused by the interference of the rotation of the roller 221 when the non-circular workpiece is demoulded. The versatility of the travel rod for different types of workpieces is greatly improved. The position of the limit block 23 in the slot group 11 is changed by rotating the sleeve rod 1, and the limit block 23 is positioned by the inner wall of the first sliding slot 111 or the second sliding slot 112, which is suitable for different working conditions.

[0043] Advantage 2: For larger round thin workpieces, the ejector rods 2 and rollers 221 distributed in a circular array can provide uniform demoulding force. The multiple rollers 221 rotate in the same direction, so that the friction forces on the workpiece during the demoulding process are consistent in direction and superimposed on each other, reducing the overall demoulding resistance. The rollers 221 and the lower surface of the workpiece form rolling friction with a small rolling friction coefficient. Compared with sliding friction, the force required for ejection is further reduced, making the ejection process smoother and reducing energy loss.

[0044] Advantage 3: The outer surface of roller 221 is perpendicular to the normal direction of push plate 31, which drives the circular workpiece to rotate inside the mold cavity. The contact point between the outer surface of the circumference of roller 221 and the outer surface of the workpiece is constantly changing, giving the circular stamping workpiece a force to rotate inside the mold cavity. Under the action of roller 221 that is rising and rotating, the circular workpiece also rotates and rises, and the rotation direction of the circular workpiece is perpendicular to the rotation direction of roller 221. During the rising process, roller 221 can transmit a more uniform demoulding force to each contact point of the circular workpiece, disperse the ejection force to a wider area, avoid the risk of deformation or damage on the workpiece surface due to local stress concentration and uneven force, and ensure that the workpiece maintains good dimensional accuracy during the demoulding process.

[0045] Advantage 4: During the demoulding process of non-circular workpieces, the top of the universally rotatable push rod can always maintain good contact with the lower surface of the workpiece, so that the ejection force is evenly distributed on the workpiece. Even if there are local protrusions, depressions or angle changes on the lower surface of the workpiece, the push rod can adapt to it through its own rotation, avoiding deformation and damage of the workpiece caused by local uneven force, or shaking and jamming during demoulding, ensuring a stable and smooth demoulding process.

[0046] Advantage 5: No matter what demoulding conditions are, when the limit block 23 slides in any groove group 11, there are magnetic blocks 131 at the adjacent positions of the first slide groove 111 and the second slide groove 112 and the intersection inside the slide rail 13, which support the sleeve rod 1 structure and ensure the strength and stability of the sleeve rod 1 structure.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mold stroke rod with a rotation angle positioning function, characterized in that: include: A sleeve rod (1), wherein a groove group (11) is provided on the circumferential outer surface of the sleeve rod (1), and a rack (12) is embedded on the inner wall surface of the sleeve rod (1); A push rod (2) is slidably connected to the inside of the circumference of the sleeve rod (1), a movable cavity (21) is provided inside the push rod (2), and a rotating member (22) is arranged inside the push rod (2); The rotating member (22) comprises a roller (221) and a gear (222) which are respectively rotatably connected to one side of the inner wall of the movable cavity (21); the circumferential outer surface of the gear (222) meshes with the outer surface of the rack (12); the roller (221) and the gear (222) are arranged in sequence from top to bottom; the outer side of the roller (221) is rotatably connected to a vertical connecting rod (223); one end of the vertical connecting rod (223) away from the roller (221) is rotatably connected to the outer side of the gear (222) for driving the roller (221) to move in a circle; the highest point of the circumferential outer surface of the roller (221) is higher than the top of the ejector rod (2) for lifting a stamped workpiece inside the mold cavity.

2. The mold stroke rod with a rotation angle positioning function according to claim 1, characterized in that: The push rod (2) is slidably connected to the inner wall surface of the groove group (11) via a limit block (23) fixed on its circumferential outer surface, the bottom end of the push rod (2) is connected to a spring (24), and the upper surface of the push rod (2) is provided with a lifting member (25).

3. The mold travel rod with rotation angle positioning function according to claim 2, characterized in that: The circumferential outer surface of the limit block (23) is fixedly connected to a base (3) that slides with the outer surface of the sleeve rod (1); one end of the spring (24) away from the push rod (2) is connected to a push plate (31) that is fixedly connected to the lower surface of the base (3); the base (3) is provided with a plurality of push plates (31) that are distributed in a circumferential array on the upper surface of the push plate (31).

4. The mold stroke rod with a rotation angle positioning function according to claim 3, characterized in that: The slot group (11) comprises a first slide slot (111) and a second slide slot (112); the first slide slot (111) and the second slide slot (112) are arranged at equal intervals; the first slide slot (111) and the second slide slot (112) are parallel to each other; a slide rail (13) connected to the inside of the first slide slot (111) is provided on the circumferential outer surface of the sleeve rod (1); the second slide slot (112) is connected to the inside of the slide rail (13); and the bottom of the inner wall of the slide rail (13) is in the same horizontal plane as the bottom of the inner wall of the slot group (11).

5. The mold travel rod with rotation angle positioning function according to claim 4, characterized in that: A magnetic block (131) is slidably fitted on the inner wall surface of the slide rail (13), two magnetic blocks (131) are arranged inside the slide rail (13), and the two magnetic blocks (131) are symmetrically distributed on both sides of the limit block (23).

6. The mold travel rod with rotation angle positioning function according to claim 5, characterized in that: The outer side of the limit block (23) adopts a magnetic design that is magnetically connected to the outer surface of the magnetic block (131).

7. The mold travel rod with rotation angle positioning function according to claim 3, characterized in that: The lifting member (25) comprises a guide rod (251) slidably connected to the inside of the push rod (2); the top end of the guide rod (251) extends to the upper surface of the push rod (2) and is fixedly connected to a lifting block (252); the lifting block (252) is rotatably connected to a rotating plate (253) via a universal joint arranged above the lifting block (252); the lower surface of the lifting block (252) is rotatably connected to a rotating plate (254); and the rotating plate (254) is rotatably connected to a connecting plate (255) connected to the upper surface of the push rod (2) on a side away from the lifting block (252).

8. The mold travel rod with rotation angle positioning function according to claim 7, characterized in that: The guide rod (251) is slidably connected to a protrusion (256) via a movable groove provided on its circumferential outer surface; an elastic member (257) connected to the inner wall of the movable groove is provided on a side of the protrusion (256) close to the guide rod (251); and a pressure plate (258) is fixedly connected to the circumferential inner wall of the sleeve rod (1).

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