A mold stroke rod with a function of positioning the rotation angle

Abstract

The present invention relates to the technical field of stamping dies, and discloses a die stroke rod with a rotational angle positioning function, including a sleeve rod, wherein a groove group is formed on the circumferential outer surface of the sleeve rod, and a rack is embedded on the inner wall surface of the sleeve rod; a push rod, which is slidably connected inside the circumference of the sleeve rod, an activity cavity formed inside the push rod, and a rotating part arranged inside the push rod. This die stroke rod with a rotational angle positioning function can effectively solve the problems in the prior art that when processing a large circular thin workpiece, when the circular thin workpiece is stamped and demolded, the circular thin workpiece that fits tightly with the die surface is prone to jamming. An ordinary push rod requires a large ejection force to eject the workpiece, and the ejection force cannot be evenly distributed, resulting in excessive local stress on the workpiece and deformation, thereby increasing the rejection rate.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping dies, and particularly to a die stroke rod with a rotational angle positioning function. Background Art

[0002] A die stroke rod, also often referred to as a die ejector rod or ejector pin, is an important component in the die structure. It is mainly used to push the formed workpiece out of the die cavity after the forming process such as stamping or injection molding is completed, so that the workpiece can be smoothly demolded. One end of the stroke rod is connected to the ejection mechanism of the die, and the other end extends into the die cavity and contacts the workpiece. By applying an ejection force, the stroke rod overcomes the adhesion and friction between the workpiece and the die cavity, enabling the workpiece to be separated from the die, facilitating subsequent workpiece picking and sorting processes.

[0003] In the prior art, for the processing of larger circular thin workpieces, when the circular thin workpiece is stamped and demolded, the circular thin workpiece that fits closely to the die surface is prone to jamming. Ordinary ejector rods require a large ejection force to push out the workpiece, and the ejection force cannot be evenly distributed, resulting in excessive local stress on the workpiece and deformation, thereby increasing the scrap rate. Summary of the Invention

[0004] Aiming at the above-mentioned drawbacks of the prior art, the present invention provides a die stroke rod with a rotational angle positioning function, which can effectively solve the problems 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 to the die surface is prone to jamming, ordinary ejector rods require a large ejection force to push out the workpiece, and the ejection force cannot be evenly distributed, resulting in excessive local stress on the workpiece and deformation, thereby increasing the scrap rate.

[0005] To achieve the above object, the present invention is realized through the following technical solutions:

[0006] The present invention provides a die stroke rod with a rotational angle positioning function, comprising:

[0007] A sleeve rod, on the circumferential outer surface of which a groove group is provided, and on the inner wall surface of which a rack is embedded;

[0008] A top rod, slidably connected inside the circumference of the sleeve rod, with a movable cavity opened inside the top rod and a rotating member provided inside the top rod;

[0009] Among them, the rotating member includes a roller and a gear respectively rotatably connected to one side of the inner wall of the movable cavity. The outer circumferential surface of the gear meshes with the outer surface of the rack. The roller and the gear are distributed in sequence from top to bottom. A vertical connecting rod is rotatably connected to the outside of the roller. One end of the vertical connecting rod away from the roller is rotatably connected to the outside of the gear, for driving the circumferential motion of the roller. The highest point of the outer circumferential surface of the roller is higher than the top end of the ejector rod, for jacking up the stamping workpiece inside the mold cavity.

[0010] Further, the ejector rod is slidably connected to the inner wall surface of the groove group through a limiting block fixed on its outer circumferential surface. A spring is connected to the bottom end of the ejector rod, and a lifting member is arranged on the upper surface of the ejector rod.

[0011] Further, a base that slides on the outer surface of the sleeve rod is fixedly connected to the outer circumferential surface of the limiting block. One end of the spring away from the ejector rod is connected to a pushing plate fixedly connected to the lower surface of the base. A plurality of bases are arranged and circumferentially arrayed on the upper surface of the pushing plate. The axis line of the roller coincides with the normal line of the circular workpiece.

[0012] Further, the groove group includes a first chute and a second chute. The first chute and the second chute are distributed at equal intervals. The first chute is parallel to the second chute. A slide rail communicating with the inside of the first chute is opened on the outer circumferential surface of the sleeve rod. The second chute communicates with the inside of the slide rail. The bottom of the inner wall of the slide rail is at the same horizontal plane as the bottom of the inner wall of the groove group.

[0013] Further, a magnetic block is slidably attached to the inner wall surface of the slide rail. Two magnetic blocks are arranged inside each slide rail, and the two magnetic blocks are symmetrically distributed on both sides of the limiting block.

[0014] Further, the outside of the limiting block is magnetically designed to be magnetically connected to the outer surface of the magnetic block.

[0015] Further, the lifting member includes a guide rod slidably arranged inside the ejector rod. The top end of the guide rod extends to the upper surface of the ejector rod and is fixedly connected to a lifting block. The lifting block is rotatably connected to a rotating plate through a universal joint arranged above it. The lower surface of the lifting block is rotatably connected to a rotating plate. One side of the rotating plate away from the lifting block is rotatably connected to a connecting plate connected to the upper surface of the ejector rod.

[0016] Further, the guide rod is slidably connected to a convex block through a movable groove opened on its outer circumferential surface. An elastic member connected to the inner wall of the movable groove is arranged on one side of the convex block close to the guide rod. A pressing plate is fixedly connected to the inner circumferential wall of the sleeve rod.

[0017] The technical solution provided by the present invention, compared with the prior art, has the following beneficial effects:

[0018] The present invention is provided with a sleeve rod, a top rod and a rotating member. When the sleeve rod and the top rod slide relative to each other, the internal gear can engage with the outer surface of the rack that can be fitted to the inner wall of the sleeve rod, driving the gear to perform meshing rotation in the circumferential direction. When the gear rotates around the rotating shaft under the action of the rack, the gear drives the roller above to rotate synchronously through the vertical connecting rod on the outer surface. After the roller contacts the lower surface of the workpiece, it still maintains the state of rotating and rising while rotating. The axis line of the roller coincides with the normal line of the pushing plate. During the rolling demolding process, the roller can apply a force perpendicular to the surface of the workpiece to ensure uniform force transmission and further improve the uniformity of the force received by the workpiece. The contact points between the outer circumferential surface of the roller 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 rotates and rises while rising, the circular workpiece also rotates and rises while rotating. 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 demolding force to each contact point of the circular workpiece, dispersing the ejecting force to a wider area, avoiding the risk of deformation or damage caused by local stress concentration and uneven force on the surface of the workpiece, and ensuring that the workpiece maintains good dimensional accuracy during the demolding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 It is a sectional structural schematic diagram of the pushing plate of an embodiment of the present invention;

[0022] Figure 3 It is a separated structural schematic diagram of the sleeve rod, the top rod, the spring and the lifting member of an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the top rod of an embodiment of the present invention;

[0024] Figure 5 It is a sectional structural schematic diagram of the top rod of an embodiment of the present invention;

[0025] Figure 6 It is a sectional view of the sleeve rod of an embodiment of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the slide rail and the magnetic block of an embodiment of the present invention;

[0027] Figure 8 Schematic cross-sectional structure diagram of the sleeve rod of the embodiment of the present invention from another angle;

[0028] Figure 9 Schematic structure diagram of the lifting member of the embodiment of the present invention;

[0029] Figure 10 Distribution diagram of the rollers of the embodiment of the present invention on an external circular workpiece.

[0030] The reference numerals in the figure respectively represent: 1, sleeve rod; 11, groove group; 111, first chute; 112, second chute; 12, rack; 13, slide rail; 131, magnetic block; 2, ejector rod; 21, movable cavity; 22, rotating member; 221, roller; 222, gear; 223, vertical connecting rod; 23, limiting block; 24, spring; 25, lifting member; 251, guiding rod; 252, lifting block; 253, rotating plate; 254, rotating plate; 255, connecting plate; 256, convex block; 257, elastic member; 258, pressing plate; 3, base; 31, pushing plate. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention will be further described below with reference to the embodiments.

[0033] Embodiment:

[0034] Please refer to Figures 1 - 10 , the present invention provides a technical solution: a mold stroke rod with a rotation angle positioning function, including:

[0035] A sleeve rod 1, on the outer circumferential surface of which a groove group 11 is provided, and a rack 12 is embedded on the inner wall surface of the sleeve rod 1; there is a certain gap between the rack 12 and the sleeve rod 1.

[0036] An ejector rod 2, slidably connected inside the circumference of the sleeve rod 1, a movable cavity 21 opened inside the ejector rod 2, and a rotating member 22 provided inside the ejector rod 2;

[0037] Among them, the rotating member 22 includes a roller 221 and a gear 222 that are respectively rotatably connected to one side of the inner wall of the movable cavity 21. The outer circumferential surface of the gear 222 meshes with the outer surface of the rack 12. The roller 221 and the gear 222 are distributed in sequence from top to bottom. A vertical connecting rod 223 is rotatably connected to the outside of the roller 221. One end of the vertical connecting rod 223 away from the roller 221 is rotatably connected to the outside of the gear 222, and is used to drive the circumferential movement of the roller 221. In the initial state, the highest point of the outer circumferential surface of the roller 221 is higher than the top end of the ejector rod 2, and is used to lift the stamping workpiece inside the mold cavity.

[0038] The ejector rod 2 is slidably connected to the inner wall surface of the groove group 11 through a limiting block 23 fixed on its outer circumferential surface. A spring 24 is connected to the bottom end of the ejector rod 2, and a lifting member 25 is arranged on the upper surface of the ejector rod 2.

[0039] A base 3 that slides on the outer surface of the sleeve rod 1 is fixedly connected to the outer circumferential surface of the limiting block 23. One end of the spring 24 away from the ejector rod 2 is connected to a pushing plate 31 fixedly connected to the lower surface of the base 3. A plurality of bases 3 are provided and are circumferentially and arrayedly distributed on the upper surface of the pushing plate 31. The axis line of the roller 221 coincides with the normal line of the circular workpiece. The height of the base 3 is much greater than the height of the sleeve rod 1.

[0040] The groove group 11 includes a first chute 111 and a second chute 112. The first chute 111 and the second chute 112 are distributed at equal intervals. The first chute 111 is parallel to the second chute 112. A slide rail 13 communicating with the inside of the first chute 111 is provided on the outer circumferential surface of the sleeve rod 1. The second chute 112 communicates with the inside of the slide rail 13. The bottom of the inner wall of the slide rail 13 and the bottom of the inner wall of the groove group 11 are on the same horizontal plane.

[0041] A magnetic block 131 is slidably attached to the inner wall surface of the slide rail 13. Two groups of slide rails 13 are provided and are circumferentially and arrayedly distributed around the central axis of the ejector 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 limiting block 23.

[0042] The outside of the limiting block 23 is magnetically designed to be magnetically connected to the outer surface of the magnetic block 131.

[0043] The lifting member 25 includes a guide rod 251 that slides inside the ejector rod 2. The top end of the guide rod 251 extends to the upper surface of the ejector rod 2 and is fixedly connected to a lifting block 252. The lifting block 252 is rotationally connected to a rotating plate 253 through a universal joint provided above it. The lower surface of the lifting block 252 is rotationally connected to a rotating plate 254. One side of the rotating plate 254 away from the lifting block 252 is rotationally connected to a connecting plate 255 connected to the upper surface of the ejector rod 2. A rail groove is formed on the outer surface of the ejector rod 2. The included angle between the two rail grooves is 45 degrees. In the initial state, the pressing plate 258 is above one of the rail grooves; after the sleeve rod 1 rotates 45 degrees, the pressing plate 258 is above the other rail groove; when the ejector rod 2 and the sleeve rod 1 slide relative to each other, the pressing plate 258 is inside the rail groove. The top of the rail groove is designed with a tapered opening to play a guiding role.

[0044] The guide rod 251 is slidably connected to a convex block 256 through a movable groove formed on its circumferential outer surface. An elastic member 257 connected to the inner wall of the movable groove is provided on one side of the convex block 256 close to the guide rod 251. The circumferential inner wall of the sleeve rod 1 is fixedly connected to a pressing plate 258. The circumferential outer surface of the roller 221 is made of rubber material to increase the friction with the surface of the workpiece.

[0045] The process of blanking a circular thin material workpiece:

[0046] In practical applications, through the cooperation of the upper and lower die sets, the thin sheet material can be stamped into the required circular workpiece. During the stamping process, the workpiece will undergo elastic deformation. After the punching force disappears, the material returns to its original shape. The friction between the edge part and the die cavity wall will prevent the elastic recovery of the material, resulting in the workpiece being closely attached to the cavity. Especially after a larger circular thin material workpiece is stamped, it is easy to get stuck inside the die cavity and is not easy to be ejected. In this scenario, for a traditional stroke push rod, the pressure at the place where the surface of the stamped workpiece contacts the push rod is greater than other places, which is likely to cause deformation of the workpiece surface.

[0047] 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.

[0048] 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.

[0049] After stamping, the ejecting mechanism below drives the pushing plate 31 to move upward. The distance between the upper surface of the pushing plate 31 and the lower surface of the mold gradually decreases. During this process, after the upper surface of the sleeve rod 1 is in close contact with the lower surface of the mold cavity, the spring 24 between the sleeve rod 1 and the ejector rod 2 is compressed, and a relative displacement occurs between the sleeve rod 1 and the ejector rod 2. The position of the sleeve rod 1 remains unchanged, and the ejector rod 2 slides upward along the inner wall of the sleeve rod 1. During this process, the limiting block 23 on the outer surface of the ejector rod 2 is on the inner wall of the first chute 111, and the gear 222 inside the movable cavity 21 meshes with the rack 12 on the inner wall of the sleeve rod 1. When a relative displacement occurs between the sleeve rod 1 and the ejector rod 2, 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 rod. Among them, the gear 222 is located below the ejector rod 2, and the roller 221 is located above the ejector rod 2. The highest point on the outer circumference of the roller 221 is higher than the upper surface of the ejector rod 2 and can be in direct contact with 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 remains vertical, and the straight line connecting the center points of the gear 222 and the roller 221 is parallel to the vertical connecting rod 223.

[0050] When the gear 222 rotates around the rotating shaft under the action of the rack 12, the gear 222 drives the upper roller 221 to rotate synchronously through the vertical connecting rod 223 on the outer surface. Therefore, during the demolding process, the position of 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 into the mold cavity until the outer surface of the roller 221 contacts the lower surface of the stamping workpiece. During the upward movement of the ejector rod 2, the roller 221 moves upward together with the ejector rod 2 and rotates under the action of the gear 222, presenting a state of rising and rotating at the same time. Since multiple sleeve rods 1, ejector rods 2 and bases 3 are provided and are circumferentially arrayed around the axis of the circular mold, and the axis of the roller 221 inside each ejector rod 2 can pass through the axis of the pushing plate 31, and the straight line perpendicular to the axis of the roller 221 is parallel to the tangent of the circular workpiece. The rotation directions of the multiple rollers 221 are the same, so that the friction force directions received by the circular workpiece during the demolding process are the same. In this way, in the circumferential direction where the workpiece contacts the roller 221, the friction forces are superimposed and the directions are unified, which is more conducive to smoothly ejecting the workpiece from the mold, further reducing the overall demolding resistance, reducing the force required for ejection, helping to protect the workpiece and the mold, and reducing energy consumption.

[0051] After the roller 221 contacts the lower surface of the workpiece, it still remains in a state of rotating and rising. The axis line of the roller 221 coincides with the normal line of the pushing plate 31. During the rolling demolding process, the roller 221 can apply a force perpendicular to the surface of the workpiece, ensuring uniform force transmission and further improving the uniformity of the force on the workpiece. Multiple ejector pins 2 work together and cooperate with the rolling of the roller 221 to smoothly eject the circular workpiece from the mold. Even for circular workpieces with larger sizes and thinner wall thicknesses, the smoothness and uniformity during the demolding process can be ensured. The roller 221 forms a 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.

[0052] Since the outer surface of the roller 221 is designed with a rubber material, the friction force is relatively large. As Figure 10 shown, the outer surface of the roller 221 is perpendicular to the normal direction of the pushing plate 31, which will drive the circular workpiece to rotate inside the mold cavity. The contact points between the outer circumferential surface of the roller 221 and the outer surface of the workpiece are constantly changing, giving the circular stamping workpiece a force to rotate inside the mold cavity. During the rising process, the roller 221 can transfer a more uniform demolding force to each contact point of the circular workpiece, 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 demolding process. It can also reduce the risk of cracks or fractures in some high-strength and easily cracked circular workpieces during the demolding process.

[0053] The reset process after demolding:

[0054] The circular workpiece rotates and rises inside the mold cavity under the action of the ejector pin 2 until it is completely separated from the inner wall of the mold cavity. At this time, the spring 24 is also in a completely compressed state, the limit block 23 is at the upper position inside the first chute 111, the lower surface of the sleeve rod 1 is close to the lower surface of the pushing plate 31, the ejection mechanism drives the pushing plate 31 to reset downward, the distance between the lower surface of the mold and the pushing 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 remains fixed at this position, the base 3 and the ejector pin 2 slide downward under the action of the pushing plate 31, the distance between the lower surface of the sleeve rod 1 and the upper surface of the pushing plate 31 gradually increases, and the spring 24 arranged inside the circumference of the base 3 also gradually recovers its elastic potential energy until the lower surface of the inner wall of the sleeve rod 1 fits with the lower end of the ejector pin 2, and the sleeve rod 1, the ejector pin 2 and the base 3 all return to their initial states.

[0055] The process of demolding non-circular workpieces:

[0056] In a complex stamping module, circular workpieces and parts with other stamping shapes are involved. For some special stamping processes, such as compound stamping and continuous stamping, multiple workpieces with different shapes need to be processed simultaneously in the same die. In these processes, to ensure the forming quality of the workpieces and the continuity of production, a stroke push rod system that can adapt to the demoulding requirements of multiple workpieces is needed. In this case, the base 3, the sleeve rod 1, and the ejector rod 2 can be used separately as required, without the need for multiple circumferential arrays. The lower surface of the base 3 is fixedly installed above the push plate 31, and the base 3 is fixedly connected to the ejector rod 2 through the limit block 23. At this time, the limit block 23 is at the junction of the first chute 111 and the slide rail 13. Rotate the sleeve rod 1 clockwise by forty-five degrees on the outer circumferential surface of the ejector rod 2 (due to the influence of the bottom spring 24, there is a certain resistance when the sleeve rod 1 rotates. At the same time, the stability is ensured, preventing the automatic rotation of the sleeve rod 1 caused by stamping vibration). The base 3, the limit block 23, and the ejector rod 2 are all fixed and do not move, and the magnetic block 131 is always on both sides of the limit block 23 under the influence of the magnetic force and does not rotate either. Only the sleeve rod 1 makes a relative rotational movement. After rotating forty-five degrees, the side of one of the magnetic blocks 131 fits against the inner wall side of the slide rail 13, and the opposite side protrudes slightly from the inner wall surface of the second chute 112; the side of the other magnetic block 131 is flush with the inner wall surface of the first chute 111, and the opposite side protrudes slightly from the inner wall surface of the second chute 112. The arc length of the limit block 23 away from the axis of the ejector rod 2 is less than the outer arc length of the groove group 11, avoiding the situation of damage to the stroke rod caused by jamming between the sleeve rod 1 and the ejector rod 2 during the demoulding process and ensuring the stability of operation.

[0057] Regardless of the demoulding situation applied and the limit block 23 sliding in any groove group 11, there is a magnetic block 131 at the junction between the adjacent positions of the first chute 111 and the second chute 112 and the inside of the slide rail 13, which supports the structure of the sleeve rod 1 and ensures the strength and stability of the structure of the sleeve rod 1. After the rotation of the sleeve rod 1 is completed, the rack 12 embedded inside it also synchronously completes a forty-five-degree rotation. The bottom side of the rack 12 is at a certain distance from the lower surface of the movable cavity 21, which can ensure that when the sleeve rod 1 rotates, the internal rack 12 will not collide with the gear 222.

[0058] Meanwhile, when the sleeve rod 1 rotates, the pressure plate 258 on its inner wall will move synchronously (rail grooves are formed on the outer surface of the ejector rod 2, and the included angle between the two rail grooves is 45 degrees. In the initial state, the pressure plate 258 is above one of the rail grooves; after the sleeve rod 1 rotates 45 degrees, the pressure plate 258 is above the other rail groove; when the ejector rod 2 slides relative to the sleeve rod 1, the pressure plate 258 is inside the rail groove. The top of the rail groove is designed with a tapered opening for guiding). During the process of rotating 45 degrees clockwise, the outer surface of the pressure plate 258 fits against the hinge joint of the connecting plate 255 and the rotating plate 254, and pushes the connecting plate 255 and the rotating plate 254 to gradually change 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 ejector rod 2). The convex block 256 moves upward from inside the ejector rod 2 until the included angle between the connecting plate 255 and the rotating plate 254 is converted to 180 degrees. At this time, the limiting block 23 enters the inside of the second chute 112, and the lifting block 252 is at the highest point within its stroke range. The convex block 256 is outwardly expanded under the action of the elastic member 257 (the elastic member 257 is preferably a compression spring or a leaf spring), and the lowest point on its circumferential outer surface fits against the upper surface of the ejector 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).

[0059] After stamping is completed, the lower ejecting mechanism drives the pushing plate 31 to move upward, and the base 3 and the ejector rod 2 move upward following the pushing plate 31. The bottom of the mold is parallel to the pushing 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 one of the rail grooves, the top end of the sleeve rod 1 fits against the lower surface of the mold, and the ejector rod 2 passes through the slot hole of the mold and enters the inside of 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 come into contact with the lower surface of the workpiece. After the rotating plate 253 contacts the lower surface of the workpiece, the ejector rod 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 completely fits against the lower surface of the workpiece, which is suitable for ejecting and lifting workpieces within a certain range with different inclined directions and inclined angles. The rotating plate 253 can automatically adjust its posture according to the specific shape and inclined angle of the lower surface of the workpiece, closely fitting the surface of the workpiece. Whether the lower surface of the workpiece is a regular inclined surface or a complex irregular curved surface, it can provide effective support and ejection functions, greatly improving the versatility of the mold for different types of workpieces and reducing the situation of designing multiple special stroke push rods or molds due to the shape differences of workpieces.

[0060] After demoulding is completed and the sleeve rod 1 returns to its initial state, when it is rotated counterclockwise by 45 degrees, the pressure plate 258 synchronously rotates counterclockwise from above one of the rail grooves. The side of the pressure plate 258 away from the rotating plate 254 impacts the outer surface of the convex block 256, squeezing the convex block 256 into the inside of the guide rod 251. The rotating plate 254 and the connecting plate 255 start to rotate under the influence of the gravity of the lifting block 252, and the angle between them gradually decreases until it returns to the initial state. The guide rod 251 drives the lifting block 252 to slide inside the ejector rod 2, and finally returns to the state where the upper surface of the pressure plate 258 is lower than the highest point of the roller 221.

[0061] In summary, the stroke push rod has the following advantages:

[0062] Advantage 1: Adopting a double-layer design, the top end of the sleeve rod 1 is connected to the outer surface of the mold cavity, playing a guiding role. It can not only handle the demoulding of large circular thin workpieces, but also be applicable to the demoulding of non-circular workpieces with an inclined lower surface or complex shapes. For circular workpieces, the limit block 23 is inside the first chute 111. When jacking up in this state, the highest point of the roller 221 is higher than the top end of the ejector rod 2 and also higher than the upper surface of the rotating plate 253. 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 placed inside the second chute 112. Using the components in the lifting member 25, the upper surface of the rotating plate 253 is made higher than the highest point of the roller 221, and the roller 221 does not contact the surface of the workpiece, avoiding wrinkles, deformation, etc. caused by the rotation of the roller 221 interfering with the non-circular workpiece during demoulding. This greatly improves the versatility of the stroke rod for different types of workpieces. By rotating the sleeve rod 1 to change the position of the limit block 23 in the groove group 11, the limit block 23 is positioned by the inner wall of the first chute 111 or the second chute 112, suitable for different working conditions.

[0063] Advantage 2: For large circular thin workpieces, the ejector rods 2 and the rollers 221 distributed in a circumferential array can provide uniform demoulding force. The rotation directions of the multiple rollers 221 are the same, making the friction directions received by the workpiece during the demoulding process consistent and superimposed on each other, reducing the overall demoulding resistance. The roller 221 forms a rolling friction with the lower surface of the workpiece, and the rolling friction coefficient is small. Compared with sliding friction, it further reduces the force required for ejection, making the ejection process smoother and reducing energy loss at the same time.

[0064] Advantage 3: The outer surface of the roller 221 is perpendicular to the normal direction of the pushing plate 31, which will drive the circular workpiece to rotate inside the mold cavity. The contact points between the outer circumferential surface of the roller 221 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 221 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 221. During the rising process, the roller 221 can transfer a more uniform demolding force to each contact point of the circular workpiece, dispersing the ejection force to a wider area, avoiding the risk of deformation or damage to the workpiece surface caused by local stress concentration and uneven stress, and ensuring that the workpiece maintains good dimensional accuracy during the demolding process.

[0065] Advantage 4: During the demolding process of non-circular workpieces, the top end of the universal 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 by its own rotation, avoiding workpiece deformation, damage or shaking and jamming during demolding caused by uneven local force, and ensuring the smoothness and smoothness of the demolding process.

[0066] Advantage 5: Regardless of the demolding situation, the limiting block 23 slides in any slot group 11. There are magnetic blocks 131 at the adjacent positions of the first sliding slot 111 and the second sliding slot 112 and the inner junction of the slide rail 13 to support the structure of the sleeve rod 1, ensuring the strength and stability of the sleeve rod 1 structure.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and 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 rotational angle positioning function, characterized in that, Including: A sleeve rod (1), 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), which is slidably connected inside the circumference of the sleeve rod (1), an activity cavity (21) opened inside the push rod (2), and a rotating member (22) provided inside the push rod (2); Wherein, the rotating member (22) includes a roller (221) and a gear (222) respectively rotatably connected to one side of the inner wall of the activity cavity (21). The circumferential outer surface of the gear (222) is engaged with the outer surface of the rack (12). The roller (221) and the gear (222) are distributed in sequence from top to bottom. A vertical connecting rod (223) is rotatably connected to the outside of the roller (221). One end of the vertical connecting rod (223) away from the roller (221) is rotatably connected to the outside of the gear (222) for driving the circumferential movement of the roller (221). The highest point on the circumferential outer surface of the roller (221) is higher than the top end of the push rod (2) for jacking up the stamping workpiece inside the mold cavity; Wherein, the push rod (2) is slidably connected to the inner wall surface of the groove group (11) through a limiting block (23) fixed on its circumferential outer surface. A spring (24) is connected to the bottom end of the push rod (2). A lifting member (25) is provided on the upper surface of the push rod (2). The groove group (11) includes a first chute (111) and a second chute (112). The first chute (111) and the second chute (112) are distributed at equal intervals. The first chute (111) is parallel to the second chute (112). A slide rail (13) communicating with the inside of the first chute (111) is opened on the circumferential outer surface of the sleeve rod (1). The second chute (112) communicates with the inside of the slide rail (13). The bottom of the inner wall of the slide rail (13) is on the same horizontal plane as the bottom of the inner wall of the groove group (11). The lifting member (25) includes a guide rod (251) slidably connected inside 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 with a lifting block (252). The lifting block (252) is rotatably connected with a rotating plate (253) through a universal joint arranged above it. The lower surface of the lifting block (252) is rotatably connected with a rotating plate (254). One side of the rotating plate (254) away from the lifting block (252) is rotatably connected with a connecting plate (255) connected to the upper surface of the push rod (2). The guide rod (251) is slidably connected with a convex block (256) through an activity groove opened on its circumferential outer surface. An elastic member (257) connected to the inner wall of the activity groove is provided on one side of the convex block (256) close to the guide rod (251). A pressure-resistant plate (258) is fixedly connected to the circumferential inner wall of the sleeve rod (1).

2. The mold stroke rod with a rotational angle positioning function according to claim 1, wherein: The circumferential outer surface of the limiting block (23) is fixedly connected with a base (3) that slides on the outer surface of the sleeve rod (1). One end of the spring (24) away from the ejector rod (2) is connected with a push plate (31) fixedly connected to the lower surface of the base (3). A plurality of bases (3) are provided and are circumferentially and arrayed on the upper surface of the push plate (31).

3. A mold stroke rod with a rotation angle positioning function according to claim 2, characterized in that: A magnetic block (131) is slidably attached to the inner wall surface of the slide rail (13). Two magnetic blocks (131) are provided inside the slide rail (13), and the two magnetic blocks (131) are symmetrically distributed on both sides of the limiting block (23).

4. A mold stroke rod with a rotation angle positioning function according to claim 3, characterized in that: The outer side of the limiting block (23) is magnetically designed to be magnetically connected to the outer surface of the magnetic block (131).

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