Cam drive mechanism and powder forming machine

Abstract

The present invention belongs to the technical field of powder forming equipment, and in particular relates to a cam drive mechanism and a powder forming machine, comprising a first rotating shaft, a multi-stage cam and a drive mechanism, wherein the first rotating shaft is rotatably connected to the housing of the forming equipment; the multi-stage cam is key-connected to the first rotating shaft, and the multi-stage cam can move along the length direction of the first rotating shaft through a keyway structure; the drive mechanism is arranged on the first rotating shaft, and the output end of the drive mechanism is drive-connected to the multi-stage cam; wherein the outer wall of the multi-stage cam is formed with multiple groups of outer contours adapted to the moving strokes of different components, and all the outer contours are arranged side by side along the moving direction of the multi-stage cam. The multi-stage cam used can be adapted to the outer contours of different strokes through the drive mechanism to quickly, without disassembly, and efficiently align the components to be driven, and flexibly adjust the drive stroke, thereby greatly shortening the disassembly and assembly downtime caused by the replacement of the molded product, and effectively improving the powder forming capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of powder forming equipment, and in particular relates to a cam driving mechanism and a powder forming machine. Background Art

[0002] The cam drive mechanism of a powder forming machine is a mechanical transmission device that converts rotational motion into linear motion or other forms of motion. The cam typically has a specific curved profile. As it rotates, its profile pushes the follower (such as a push rod or rocker arm) in contact with it to produce the desired movement. When the cam's raised portion contacts the follower, it pushes the follower outward, while when the cam's recessed portion contacts, the follower moves inward or remains stationary, thus converting rotational motion into linear motion or oscillation. The cam's design allows for precise control of the follower's velocity, acceleration, and displacement to meet the operational requirements of different mechanical devices.

[0003] The cam drive structure of the powder forming machine achieves precise control of key steps such as powder filling, pressing and demoulding by precisely controlling the shape and movement of the cam, thereby improving forming efficiency and product quality.

[0004] In order to reduce the energy consumption of powder forming machines, designers usually use a single set of rotating shafts to simultaneously drive multiple sets of cams to control and drive the powder filling, pressing and demolding parts; however, in the traditional cam drive structure, the shape of the cam is fixed according to the movement stroke of the component module to be driven. If the shape of the module to be driven changes, for example, the pressing stroke, powder filling movement stroke or demolding stroke needs to be changed, the corresponding cam needs to be replaced, and the process of changing the cam involves the disassembly and assembly of the cam, especially in the single-axis drive structure, where multiple sets of cams are designed in parallel. If the cam installed in the middle position needs to be disassembled, the cam arranged first must be removed first. The process is cumbersome and needs to be improved urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a cam drive mechanism, which aims to solve the technical problem in the prior art that when the pressing stroke, powder filling movement stroke or demolding stroke of the powder forming machine needs to be changed, the corresponding cam needs to be replaced, and the process of changing the cam involves the disassembly and assembly of the cam, so the cam arranged earlier must be removed first, which is a cumbersome process.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides a cam driving mechanism, including a first rotating shaft, a multi-stage cam and a driving mechanism, wherein the first rotating shaft is rotatably connected to the shell of the molding equipment; the multi-stage cam is key-connected to the first rotating shaft, and the multi-stage cam can move along the length direction of the first rotating shaft through a keyway structure; the driving mechanism is arranged on the first rotating shaft, and the output end of the driving mechanism is drive-connected to the multi-stage cam; wherein the outer side wall of the multi-stage cam is formed with multiple groups of outer contours adapted to the moving strokes of different components, and all the outer contours are arranged side by side along the moving direction of the multi-stage cam.

[0007] Optionally, the first rotating shaft includes a main shaft body, a first transmission wheel and a first driving source, the first transmission wheel is tightly connected to the end of the main shaft body away from the driving mechanism, the first driving source is drivingly connected to the first transmission wheel to drive the main shaft body to rotate, the multi-stage cam key is connected to the main shaft body, the first driving source is arranged on the outer side wall of the shell of the molding equipment, and at least part of the driving mechanism is arranged on the main shaft body.

[0008] Optionally, the main shaft body is provided with an open inner cavity along its length direction, a keyway is provided on the outer side wall of the open inner cavity, a key body is provided on the multi-stage cam, the key body is key-connected to the keyway, the key body can be inserted into the open inner cavity through the keyway, at least part of the driving mechanism extends into the open inner cavity, and the output end of the driving mechanism is drive-connected to the key body.

[0009] Optionally, the driving mechanism includes a transmission screw, a movable nut and a second driving source, the transmission screw is rotatably connected in the open inner cavity, the length direction of the transmission screw is parallel to the length direction of the main shaft body, the movable nut thread is adapted on the transmission screw, the movable nut is rotatably connected to the key body, the second driving source is arranged on the housing of the molding equipment, and the second driving source is drivingly connected to the transmission screw.

[0010] Optionally, the movable nut is arranged in an annular structure, the inner ring of the movable nut is provided with a thread groove adapted to the thread of the transmission screw, the outer wall of the movable nut is provided with a limiting convex ring for slidingly connecting the end of the key body, the outer wall of the limiting convex ring is circumferentially formed with a rotating connection groove, at least part of the key body is slidingly connected in the rotating connection groove, when the main shaft body drives the multi-stage cam and the key body to rotate and move, the end of the key body rotates and moves along the groove extension direction of the rotating connection groove; when the second driving source drives the transmission screw to rotate, the movable nut drives the limiting convex ring to move along the axial direction of the transmission screw, and the limiting convex ring drives the movable nut and the key body to move along the length direction of the key groove through the rotating connection groove.

[0011] Optionally, one end of the transmission screw is rotatably connected to the inner wall of the end of the open inner cavity away from its opening, and the other end of the transmission screw passes through the opening of the open inner cavity to the outside of the open inner cavity. The second driving source is arranged at the end of the shell away from the first driving source, and the end of the transmission screw extending outside the open inner cavity is tightly connected with a second transmission wheel, and the second driving source is drivingly connected to the second transmission wheel.

[0012] Optionally, a gap is provided between the transmission screw and the inner wall of the open inner cavity.

[0013] Optionally, the multi-stage cam includes a sleeve and a cam ring, the sleeve is arranged on the outer side wall of the main shaft body, the key body is arranged at the end of the sleeve facing the main shaft body, the number of the cam rings is multiple groups, the circumferential outer side walls of all the cam rings are different in shape, the inner ring inner diameters of all the cam rings are the same, and all the cam rings are arranged in sequence and side by side on the outer side wall of the sleeve along the axial direction of the sleeve.

[0014] Optionally, all of the cam rings have equal thickness.

[0015] In order to achieve the above object, the present invention also provides a powder forming machine, comprising the above cam driving mechanism.

[0016] The above one or more technical solutions in the cam drive mechanism and powder forming machine provided by the embodiment of the present invention have at least one of the following technical effects: the first rotating shaft drives the multi-stage cam to rotate, and the outer contours of all the multi-stage cams rotate at the same time, and one group of outer contours adapted to the current moving stroke of the component can smoothly drive the component to move according to the preset stroke; when it is necessary to mold products of different models and sizes and change the moving stroke of the corresponding component, the driving mechanism drives the multi-stage cam to move and adjust along the length direction of the first rotating shaft so that the preset outer contour is aligned with the force-bearing end of the component. When the first rotating shaft is started, the outer contour of the multi-stage cam that is most recently aligned with the force-bearing end of the component can drive the component to move along the new stroke, thereby adapting The cam driving device provided by the present invention and the multi-stage cam used in the powder molding machine can adapt to the outer contours of different strokes through the driving mechanism, so the components to be driven can be quickly, without disassembly and efficiently aligned, and the driving stroke can be flexibly adjusted, thereby greatly shortening the disassembly and assembly downtime caused by the replacement of the molded products, and effectively improving the powder molding production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural schematic diagram of a cam drive mechanism provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a shaft sleeve with an installation step provided by an embodiment of the present invention.

[0020] Figure 3 A schematic structural diagram of a transmission screw and a movable nut provided in an embodiment of the present invention.

[0021] Figure 4 A schematic structural diagram of a powder forming machine provided in an embodiment of the present invention.

[0022] Among them, the reference numerals in the figures are:

[0023] 100—housing 200—powder forming module 300—cam drive mechanism

[0024] 400—First rotating shaft 500—Multi-stage cam 600—Drive mechanism

[0025] 410 - Main shaft 420 - First transmission wheel 430 - First driving source

[0026] 700—Installation cavity 411—Opening cavity 412—Keyway

[0027] 800—key body 610—drive screw 620—moving nut

[0028] 630—Second driving source 621—Limiting protruding ring 622—Rotation connection groove

[0029] 510—sleeve 520—cam ring 511—mounting hole

[0030] 513—Install steps. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 4The described embodiments are exemplary and are intended to be used to explain the embodiments of the present invention, but should not be construed as limiting the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "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 accompanying drawings, and are only for the convenience of describing the embodiments of 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 limiting the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0035] In one embodiment of the present invention, Figures 1 to 4 As shown, a powder forming machine is provided, including a shell 100, a powder forming module 200 and a cam driving mechanism 300, wherein the cam driving mechanism 300 includes a first rotating shaft 400, a multi-stage cam 500 and a driving mechanism 600, wherein the first rotating shaft 400 is rotatably connected to the shell 100 of the forming device; the multi-stage cam 500 is key-connected to the first rotating shaft 400, and the multi-stage cam 500 can move along the length direction of the first rotating shaft 400 through a keyway 412 structure; the driving mechanism 600 is arranged on the first rotating shaft 400, and the output end of the driving mechanism 600 is drivingly connected to the multi-stage cam 500; wherein the outer side wall of the multi-stage cam 500 is formed with multiple groups of outer contours adapted to the moving strokes of different components, and all the outer contours are arranged side by side along the moving direction of the multi-stage cam 500.

[0036] In this embodiment, the shell 100 of the molding device is designed in a cubic structure and has a mounting cavity 700 . The first rotating shaft 400 is rotatably connected to the top of the mounting cavity 700 , and the end of the first rotating shaft 400 extends out of the mounting cavity 700 .

[0037] Specifically, the first rotating shaft 400 drives the multi-stage cam 500 to rotate, and the outer contours of all the multi-stage cams 500 rotate at the same time, and one group of outer contours adapted to the current moving stroke of the component can smoothly drive the component to move according to the preset stroke; when it is necessary to change the moving stroke of the corresponding component when forming products of different models and sizes, the driving mechanism 600 drives the multi-stage cam 500 to move and adjust along the length direction of the first rotating shaft 400 so that the preset outer contour is aligned with the force-bearing end of the component. When the first rotating shaft 400 is started, the outer contour of the multi-stage cam 500 that is most recently aligned with the force-bearing end of the component can drive the component to move along the new stroke, thereby adapting to the corresponding model and corresponding size of the product to be formed. The cam driving device provided by the present invention and the multi-stage cam 500 used in the powder forming machine can adapt to the outer contour of different strokes through the driving mechanism 600, so the components to be driven can be quickly, without disassembly and efficiently aligned, and the driving stroke can be flexibly adjusted, thereby greatly shortening the disassembly and assembly downtime caused by the replacement of the formed products, and effectively improving the powder forming production capacity.

[0038] like Figures 1 to 4 As shown, in another embodiment of the present invention, the first rotating shaft 400 includes a main shaft body 410, a first transmission wheel 420 and a first driving source 430, the first transmission wheel 420 is tightly connected to the end of the main shaft body 410 away from the driving mechanism 600, the first driving source 430 is drivingly connected to the first transmission wheel 420 to drive the main shaft body 410 to rotate, the multi-stage cam 500 is key-connected to the main shaft body 410, the first driving source 430 is arranged on the outer side wall of the shell 100 of the molding device, and at least a part of the driving mechanism 600 is arranged at the end of the main shaft body 410 that passes through the installation cavity 700.

[0039] In this embodiment, the end of the main shaft body 410 extends out of the installation cavity 700. The first transmission wheel 420 is tightly connected to the end of the main shaft body 410 that extends out of the installation cavity 700. The main shaft body 410 is rotationally connected to the housing 100 of the powder molding machine through a bearing unit. The first driving source 430 is a stepping motor. The first driving source 430 is fixedly arranged on the outer side wall of the housing 100 through a first mounting bracket. The first driving source 430 drives the first transmission wheel 420 through a gear that meshes and matches with the first transmission wheel 420. In other embodiments, the first transmission wheel 420 is a synchronous wheel. The output end of the first driving source 430 is tightly connected to the driving synchronous wheel. The first driving source 430 drives the first transmission wheel 420 to rotate through a synchronous belt. Adopting an external wall-mounted driving structure to drive the main shaft body 410 of the first rotating shaft 400 is beneficial to improving the space utilization rate of the molding machine and realizing space optimization.

[0040] As Figures 1 to 4 shown, in another embodiment of the present invention, the main shaft body 410 is provided with an open inner cavity 411 along its length direction. A key groove 412 is provided on the outer side wall of the open inner cavity 411. A key body 800 is provided on the multi-stage cam 500. The key body 800 is key-connected to the key groove 412. The key body 800 can penetrate into the open inner cavity 411 through the key groove 412. At least part of the driving mechanism 600 extends into the open inner cavity 411. The output end of the driving mechanism 600 is drivingly connected to the key body 800. In this embodiment, the radial cross-section of the main shaft body 410 is arranged in a U-shaped structure. The open inner cavity 411 extends along the length direction of the main shaft body 410 from the end of the main shaft body 410 far away from the first driving source 430 towards the first driving source 430. The key groove 412 is designed in a linear shape structure. The key body 800 can move along the length direction of the key groove 412. Specifically, the side wall of the key body 800 is always in contact with the inner wall of the key groove 412 and can slide relatively. When the main shaft body 410 rotates to drive the multi-stage cam 500 to rotate, the inner wall of the key groove 412 drives the key body 800 to move along with the main shaft body 410. At the same time, the output end of the driving mechanism 600 limits the key body 800 at a preset position in the key groove 412 to prevent the key body 800 from shifting, ensuring that the corresponding outer contour of the multi-stage cam 500 is aligned with the force-receiving end of the component to be driven.

[0041] As Figures 1 to 4As shown, in another embodiment of the present invention, the number of the key slots 412 and the key bodies 800 is two groups, and the two groups of key bodies 800 are respectively slidably connected to the corresponding key slots 412, and all the key slots 412 are evenly spaced and circumferentially distributed along the outer wall of the shaft body. In other embodiments, the number of the key slots 412 and the key bodies 800 can be multiple groups. The use of multiple groups of key bodies 800 structure is beneficial to further improve the connection stability between the driving mechanism 600 and the multi-stage cam 500.

[0042] like Figures 1 to 4 As shown, in another embodiment of the present invention, the driving mechanism 600 includes a transmission screw 610, a movable nut 620, and a second driving source 630. The transmission screw 610 is rotatably connected to the open inner cavity 411. The length direction of the transmission screw 610 is parallel to the length direction of the main shaft body 410. The movable nut 620 is threadedly adapted on the transmission screw 610. The movable nut 620 is rotatably connected to the key body 800. The second driving source 630 is provided on the housing 100 of the molding device, and the second driving source 630 is drivingly connected to the transmission screw 610. In this embodiment, the second driving source 630 is a servo motor, which controls the movable nut 620 to drive the key body 800 to move a preset stroke to ensure that the outer contour of the multi-stage cam 500 can be accurately moved to a preset position and aligned with the components to be driven.

[0043] like Figures 1 to 4 As shown, in another embodiment of the present invention, the movable nut 620 is arranged in an annular structure, the inner ring of the movable nut 620 is provided with a thread groove adapted to the thread of the transmission screw 610, the outer wall of the movable nut 620 is provided with a limiting convex ring 621 for slidingly connecting the end of the key body 800, and the outer wall of the limiting convex ring 621 is circumferentially formed with a rotating connection groove 622, at least part of the key body 800 is slidably connected in the rotating connection groove 622, when the main shaft body 410 drives When the multi-stage cam 500 and the key body 800 rotate and move, the end of the key body 800 rotates and moves along the extension direction of the groove body of the rotating connecting groove 622; when the second driving source 630 drives the transmission screw 610 to rotate, the moving nut 620 drives the limiting protrusion ring 621 to move along the axial direction of the transmission screw 610, and the limiting protrusion ring 621 drives the moving nut 620 and the key body 800 to move along the length direction of the key groove 412 through the rotating connecting groove 622.

[0044] like Figures 1 to 4As shown, in this embodiment, the rotating connecting groove 622 is designed as a square groove structure, and the end of the key body 800 is designed as a block structure. The end of the key body 800 is adapted to the shape of the rotating connecting groove 622. During the rotation of the key body 800, the end of the key body 800 is always abutted and adapted with the inner wall of the rotating connecting groove 622, which can ensure that the key body 800 can rotate with the main shaft body 410 to drive the multi-stage cam 500 to rotate smoothly, and can also prevent mechanical jitter from occurring between the key body 800 and the moving nut 620 due to the gap, affecting the stability of the cam drive.

[0045] In another embodiment of the present invention, one end of the transmission screw 610 is rotatably connected to the inner wall of the end of the open inner cavity 411 away from its opening, and the other end of the transmission screw 610 passes through the opening of the open inner cavity 411 to the outside of the open inner cavity 411. The second driving source 630 is arranged at the end of the shell 100 away from the first driving source 430, and the end of the transmission screw 610 extending outside the open inner cavity 411 is tightly connected with a second transmission wheel, and the second driving source 630 is drivingly connected to the second transmission wheel.

[0046] like Figures 1 to 4 As shown, in this embodiment, the second drive source 630 is designed symmetrically with the first drive source 430. The second transmission wheel is a gear. The output main shaft of the second drive source 630 is tightly connected to a drive gear that can mesh with the second transmission wheel. In other embodiments, the second transmission wheel can be a synchronous wheel, and the second drive source 630 drives the second transmission wheel to rotate via the synchronous wheel and a synchronous belt. Specifically, the first drive source 430 and the second drive source 630 are designed symmetrically. At the same time, the main shaft body 410 and the portion of the transmission screw 610 extending outside the housing 100 are also designed symmetrically, effectively achieving weight optimization and preventing one end of the housing 100 from collapsing due to overload.

[0047] like Figures 1 to 4 As shown, in another embodiment of the present invention, a gap is provided between the transmission screw 610 and the inner wall of the opening inner cavity 411. Specifically, the gap design is conducive to ensuring that the side wall of the transmission screw 610 and the inner wall of the opening inner cavity 411 are in a non-contact state, effectively improving the smooth relative rotation movement between the transmission screw 610 and the main shaft body 410.

[0048] like Figures 1 to 4As shown, in another embodiment of the present invention, the multi-stage cam 500 includes a sleeve 510 and a cam ring 520, the sleeve 510 is arranged on the outer wall of the main shaft body 410, the key body 800 is arranged at the end of the sleeve 510 facing the main shaft body 410, the number of the cam rings 520 is multiple groups, the circumferential outer wall shapes of all the cam rings 520 are different, the inner ring inner diameters of all the cam rings 520 are the same, and all the cam rings 520 are arranged in sequence and side by side on the outer wall of the sleeve 510 along the axial direction of the sleeve 510.

[0049] like Figures 1 to 4 As shown, in this embodiment, the inner ring of the sleeve 510 is slidably adapted to the outer side wall of the main shaft body 410, and the sleeve 510 is provided with a mounting hole 511, which is used to install the key body 800. When the sleeve 510 is slidably installed in the main shaft body 410 and aligned with the key slot 412, the key body 800 is inserted into the key slot 412 from the mounting hole 511 and extends into the open cavity until the other end of the key body 800 extends into the rotation connection slot 622, and the end of the key body 800 away from the rotation connection slot 622 is located in the mounting hole 511. Using the mounting hole 511 to install the key body 800 can not only adapt to the installation environment of the sleeve 510 for rotation and linear movement, but also reduce the difficulty of installation and improve the production efficiency of the molding machine.

[0050] like Figures 1 to 4 As shown, in this embodiment, the cam ring 520 is tightly connected to the shaft sleeve 510, and after the shaft sleeve 510 is installed, all the cam rings 520 are installed on the shaft sleeve 510 in sequence by interference fitting; in other embodiments, all the cam rings 520 can also be installed on the shaft sleeve 510 by key connection.

[0051] like Figures 1 to 4As shown, in another embodiment of the present invention, all of the cam rings 520 have the same thickness. The cam rings 520 with equal thickness can provide the same stroke requirement for each movement of the sleeve 510 and the key body 800 when the molding machine adjusts the stroke. The second drive source 630 only needs to drive the key body 800 to move a distance of the thickness of the cam ring 520 to achieve precise adjustment. The use of the cam ring 520 with this thickness parameter can make the second drive source 630 no longer limited to a servo motor, and can achieve precise drive through a stepper motor, thereby reducing the procurement cost of the second drive source 630 and the complexity of the machine adjustment. In an embodiment of the present invention, the outer wall of the sleeve 510 can be provided with the same number of mounting steps 513 as the cam ring 520, the thickness of the mounting steps 513 is equal to that of the cam ring, the inner diameters of all the cam rings 520 correspond one-to-one to the heights of the corresponding mounting steps 513, and all the cam rings 520 are tightly connected to the mounting steps 513 of the corresponding height in sequence. The side wall between two adjacent groups of mounting steps 513 can serve as an installation limiter for the cam ring 520, thereby realizing precise installation of the cam ring.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cam drive mechanism, characterized in that: include: a first rotating shaft rotatably connected to a housing of the molding device; a multi-stage cam, wherein the multi-stage cam is key-connected to the first rotating shaft and the multi-stage cam is movable along the length direction of the first rotating shaft through a keyway structure; A driving mechanism, wherein the driving mechanism is arranged on the first rotating shaft, and an output end of the driving mechanism is drivingly connected to the multi-stage cam; The outer side wall of the multi-stage cam is formed with multiple sets of outer contours adapted to the movement strokes of different components, and all the outer contours are arranged in parallel along the movement direction of the multi-stage cam; The first rotating shaft includes a main shaft body, a first transmission wheel and a first driving source, the first transmission wheel is tightly connected to an end of the main shaft body away from the driving mechanism, the first driving source is drivingly connected to the first transmission wheel for driving the main shaft body to rotate, the multi-stage cam key is connected to the main shaft body, the first driving source is arranged on the outer side wall of the housing of the molding device, and at least a part of the driving mechanism is arranged on the main shaft body; The main shaft body is provided with an open inner cavity along its length direction, a keyway is formed on the outer side wall of the open inner cavity, a key body is provided on the multi-stage cam, the key body is key-connected to the keyway, the key body can be inserted into the open inner cavity through the keyway, at least a portion of the drive mechanism extends into the open inner cavity, and an output end of the drive mechanism is drivingly connected to the key body; The driving mechanism includes a transmission screw, a movable nut, and a second driving source. The transmission screw is rotatably connected to the open inner cavity. The length direction of the transmission screw is parallel to the length direction of the main shaft. The movable nut is threadedly adapted on the transmission screw. The movable nut is rotatably connected to the key body. The second driving source is provided on the housing of the molding device and is drivingly connected to the transmission screw. The movable nut is arranged in an annular structure, and the inner ring of the movable nut is provided with a thread groove adapted to the thread of the transmission screw, and the outer wall of the movable nut is provided with a limiting convex ring for slidingly connecting the end of the key body, and the outer wall of the limiting convex ring is circumferentially formed with a rotating connection groove, and at least part of the key body is slidingly connected in the rotating connection groove. When the main shaft body drives the multi-stage cam and the key body to rotate and move, the end of the key body rotates and moves along the groove extension direction of the rotating connection groove; when the second driving source drives the transmission screw to rotate, the movable nut drives the limiting convex ring to move along the axial direction of the transmission screw, and the limiting convex ring drives the movable nut and the key body to move along the length direction of the key groove through the rotating connection groove.

2. The cam drive mechanism according to claim 1, wherein: One end of the transmission screw is rotatably connected to the inner wall of the end of the open inner cavity away from its opening, and the other end of the transmission screw passes through the opening of the open inner cavity to the outside of the open inner cavity. The second driving source is arranged at the end of the shell away from the first driving source, and the end of the transmission screw extending outside the open inner cavity is tightly connected with a second transmission wheel, and the second driving source is drivingly connected to the second transmission wheel.

3. The cam drive mechanism according to claim 2, wherein: A gap is provided between the transmission screw and the inner wall of the open inner cavity.

4. The cam drive mechanism according to any one of claims 1 to 3, characterized in that: The multi-stage cam includes a sleeve and a cam ring, the sleeve is arranged on the outer side wall of the main shaft body, the key body is arranged on the end of the sleeve facing the main shaft body, the number of the cam rings is multiple groups, the circumferential outer side walls of all the cam rings are different in shape, the inner ring inner diameters of all the cam rings are the same, and all the cam rings are arranged in sequence and side by side on the outer side wall of the sleeve along the axial direction of the sleeve.

5. The cam drive mechanism according to claim 4, wherein: All of the cam rings are of equal thickness.

6. A powder forming machine, characterized in that: The cam drive mechanism comprises the cam drive mechanism according to any one of claims 1 to 5.

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