Accurate reset stopping mechanism of gear twisted tooth structure of plastic mold

Abstract

The invention relates to an accurate reset stopping mechanism for a gear twisted tooth structure of a plastic mold, which comprises a motor, a gear transmission structure connected with the motor and a tooth core extending structure connected with the gear transmission structure, the gear transmission structure comprises a first gear transmission assembly and a second gear transmission assembly, and the second gear assembly at least comprises a second gear. A second gear limiting structure is arranged on the periphery of the second gear, and the tooth core extending structure comprises a tooth core sleeve and a third gear arranged on the side wall of the tooth core sleeve. By means of the device, the problems that when a servo motor controls the extending and retracting distance of the tooth core, precise control over the extending and retracting distance of the tooth core cannot be achieved due to the influence of gear transmission matching precision, and cost is high are solved. Moreover, the second gear stop block is limited through the second gear limiting structure, the rotation angle of the second gear is controlled, the extending and retracting distance of the tooth core is further controlled, and therefore the tooth core is only parallel to one end of the ejector rod head of the ejector rod assembly when extending out, and the situation that the product is damaged due to protruding is avoided.

Description

Technical Field

[0001] The invention relates to the field of plastic mold manufacturing, and in particular to a precise stop and reset mechanism for a plastic mold gear thread structure. Background Art

[0002] In the field of plastic mold manufacturing, the stop and reset mechanism of the gear tooth structure is a key component to ensure the precise opening and closing of the mold. The design of this mechanism directly affects the quality and production efficiency of the product. In the prior art, the stop and reset of the gear tooth structure can be realized through a variety of structures to extend and retract the tooth core. For example, it can be realized through a cylinder and a rack gear structure or through a motor and a chain gear structure. Of course, in order to ensure the accuracy of the stop and reset mechanism, the extension and retraction of the tooth core can also be realized through a servo motor and a gear structure.

[0003] In the process of implementing the prior art, the inventor discovered that:

[0004] In the process of extending and retracting the tooth core through the structure of servo motor and gear, the servo motor can achieve precise control, but the gear structure connected to it cannot achieve precise control of the distance of extending and retracting the tooth core due to the influence of the gear transmission matching accuracy when driven by it, and the cost is relatively high. When the tooth core is extended and retracted through the oil cylinder and rack or motor and chain gear, its position control is controlled by the time when the oil cylinder drives the rack or the time when the motor drives the chain to rotate. Obviously, it is not accurate enough and it is easy to cause the tooth core to extend and eject the ejector head, which is easy to cause the product used for molding on the tooth core to be pushed, resulting in unqualified production. In addition, the design of the rack is easy to interfere with other parts of the mold.

[0005] Therefore, the present application provides a low-cost, reasonable technical solution that can accurately control the distance of the tooth core extension and retraction to solve the technical problems of the existing technology of high cost of the stop resetting mechanism, inaccurate position control and unreasonable mold design. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] The present invention is proposed in view of the above-mentioned problems.

[0008] Therefore, the technical problem solved by the present invention is to provide a low-cost, reasonable technical solution that can accurately control the distance of the tooth core extension and retraction to solve the technical problems of high cost, inaccurate position control and unreasonable mold design of the prior art abort reset mechanism.

[0009] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0010] A precise stop-reset mechanism for a plastic mold gear threading structure comprises a motor, a gear transmission structure connected to the motor and driven by the motor, and a core extension structure connected to the gear transmission structure, the gear transmission structure comprising a first gear transmission assembly and a second gear transmission assembly, the second gear assembly comprising at least a second gear, a second gear limiting structure being arranged around the second gear, the core extension structure comprising at least a core sleeve having a core at one end and a third gear arranged on the side wall of the core sleeve and meshing with the second gear and used to drive the core to move along the axis of the core sleeve, the second gear limiting structure limits the rotation angle of the third gear on the side wall of the core sleeve by limiting the rotation angle of the second gear, and limits the distance the core moves along the axis of the core sleeve by limiting the rotation angle of the third gear.

[0011] Furthermore, the second gear limiting structure includes a stopper installed on the end face of the second gear, a first limit adjustment block and a second limit adjustment block circumferentially arranged on the second gear, and a swinging component arranged between the first limit adjustment block and the second limit adjustment block and rotatable between the first limit adjustment block and the second limit adjustment block for blocking the stopper and the second gear connected to the stopper from rotating.

[0012] Furthermore, the swing assembly specifically includes: a swing block; a swing shaft plugged into the swing block and used for the swing block to swing; the swing shaft is installed on a mold frame of a plastic mold.

[0013] Furthermore, the swing block at least includes a first blocking surface, a second blocking surface and a shifting surface connected to the first blocking surface and the second blocking surface;

[0014] The shifting surface is provided with at least one shifting opening for the stopper to shift the swinging block.

[0015] Furthermore, a first clamping hole and a second clamping hole are provided on the end face of the swing block away from the second gear. The first clamping hole and the second clamping hole are located on both sides of the dial opening. The swing assembly also includes a glass bead screw installed on the plastic mold frame for clamping into the first clamping hole or the second clamping hole.

[0016] Furthermore, the first limit adjustment block and the second limit adjustment block are respectively provided with waist-shaped grooves, and are fixed by bolts inserted into the waist-shaped grooves of the first limit adjustment block and the second limit adjustment block.

[0017] Furthermore, the core extension structure also includes: a push rod assembly located in the core sleeve; a threaded copper sleeve sleeved on the core sleeve; a fourth gear is also provided on the outer wall of the threaded copper sleeve, and a rack fixing block meshing with the fourth gear is also provided circumferentially on the threaded copper sleeve to limit the rotation of the threaded copper sleeve; an external thread is provided on the side wall of the core sleeve at the position of the threaded copper sleeve, and an internal thread connected to the external thread is provided on the inner wall of the threaded copper sleeve, so that when the third gear is driven to rotate, the external thread of the core sleeve follows the internal thread of the threaded copper sleeve to achieve movement along the axial direction of the core sleeve.

[0018] Furthermore, the push rod assembly specifically includes: a push rod; a first sleeve and a second sleeve sleeved on the push rod; a push rod head is provided at a position of a core sleeve near one end of the push rod where a core is provided, and a limit assembly for controlling the rotation of the push rod is provided at the end of the push rod away from the core sleeve where a core is provided.

[0019] Furthermore, a square block is provided at one end of the push rod away from the push rod head, and the limiting assembly includes a first clamping block and a second clamping block symmetrically arranged and clamped to the square block, so as to limit the rotation of the push rod.

[0020] Furthermore, the diameter of the second gear is larger than the diameter of the third gear and smaller than the diameter of the first gear.

[0021] Beneficial effects of the present invention: The present application provides a precise stop-reset mechanism for the gear tooth structure of a plastic mold, which solves the problem that when the servo motor controls the extension and retraction distance of the tooth core, the distance cannot be precisely controlled due to the influence of the gear transmission matching accuracy and the high cost. Moreover, by limiting the second gear block through the second gear limiting structure of the present application, the rotation angle of the second gear is controlled, and then the extension distance and retraction distance of the tooth core are controlled, so that when the tooth core is extended, it is parallel to only one end of the ejector head of the ejector assembly, and does not protrude to damage the product. At the same time, this solution avoids the problem of interference with other parts of the mold caused by the design of the rack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work. Among them:

[0023] Figure 1 It is a structural schematic diagram of a precise stop-reset mechanism of a plastic mold gear thread structure according to an embodiment of the present application;

[0024] Figure 2This is a schematic diagram of the structure of the second gear transmission assembly described in an embodiment of the present application.

[0025] Figure 3 This is a schematic structural diagram of the second gear limiting structure described in an embodiment of the present application.

[0026] Figure 4 This is a structural schematic diagram of the tooth core extension structure described in an embodiment of the present application.

[0027] Figure 5 This is a schematic structural diagram of the push rod assembly described in an embodiment of the present application.

[0028] The parts indicated by the numbers in the accompanying drawings are as follows:

[0029] 100-A precise stop and reset mechanism for a plastic mold gear tooth structure;

[0030] 1- Motor;

[0031] 2- Gear transmission structure;

[0032] 21- first gear transmission assembly;

[0033] 22-second gear transmission assembly; 221-second gear; 222-second gear limiting structure; 223-block; 224-first limiting adjustment block; 225-second limiting adjustment block; 2241-waist-shaped groove; 226-swing assembly; 2261-swing shaft; 2262-swing block; 22621-first blocking surface; 22622-second blocking surface; 22623-sliding surface; 22624-sliding opening; 2263-first clamping hole; 2264-second clamping hole; 2265-glass bead screw;

[0034] 3-thread core extension structure; 31-thread core sleeve; 311-thread core; 312-third gear; 313-external thread;

[0035] 32-threaded copper sleeve; 321-fourth gear;

[0036] 33-rod assembly; 331-rod; 3311-rod head; 332-limiting assembly; 3321-clamping block 1; 3322-clamping block 2; 34-rack fixing block.

[0037] Specific implementation method

[0038] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0039] like Figure 1-3 As shown, a precise stop-reset mechanism 100 for a plastic mold gear threading structure comprises a motor 1, a gear transmission structure 2 connected to the motor 1 and driven by the motor 1, and a core extension structure 3 connected to the gear transmission structure 2, wherein the gear transmission structure 2 comprises a first gear transmission component 21 and a second gear transmission component 22, wherein the second gear component comprises at least a second gear 221, and a second gear limiting structure 222 is arranged around the second gear 221, wherein the core extension structure 3 comprises at least a core sleeve 31 having a core 311 at one end and a third gear 312 arranged on the side wall of the core sleeve 31 and meshing with the second gear 221 and used to drive the core 311 to move along the axis of the core sleeve 31, wherein the second gear limiting structure 222 limits the rotation angle of the second gear 221 to limit the rotation angle of the third gear 312 on the side wall of the core sleeve 31, and limits the distance that the core 311 moves along the axis of the core sleeve 31 by limiting the rotation angle of the third gear 312.

[0040] Specifically, the application provides a precise stop-reset mechanism 100 for a plastic mold gear thread structure, which is used for the threaded portion of a plastic mold product to precisely control the distance of the tooth core 311 extending and retracting, thereby realizing a low-cost, reasonable, and precise control of the stop-reset molding threaded portion. It is understandable that if the stop-reset control is not precise, there will be many problems, such as extending too much or retracting too little, damaging the product, retracting too little after extending or extending too little after retracting, etc., and the thread of the product cannot be molded.

[0041] In the present application, the motor 1 provides power for the transmission of the gear transmission structure 2, and the transmission of the gear transmission structure 2 is realized by the motor 1. The extension of the tooth core extension structure 3 is realized under the influence of the gear transmission. It can also be understood that in the past, the tooth core extension distance was realized by time control of the motor rotation and stop, which easily caused the problem of too much or too little distance. In the present application, the motor and the second gear limit mechanism are limited to ensure the precise control of the distance.

[0042] The first gear transmission assembly 21 and the motor 1 are connected by a chain to achieve transmission. Specifically, the first gear transmission assembly 21 includes a gear transmission shaft 1 and a first gear installed at one end of the gear transmission shaft 1. Of course, the other end of the gear transmission shaft 1 is also equipped with chain teeth for transmission with the motor 1 through the chain.

[0043] It should be noted that bearings are installed at both ends of the transmission rod, and the first gear and chain teeth are installed between the bearings at both ends.

[0044] The first gear transmission assembly 21 and the second gear transmission assembly 22 are connected by gear meshing. Specifically, the second gear transmission assembly 22 includes not only the second gear 221 but also the second gear limiting structure 222, and also includes a gear transmission shaft 2 for fixing the second gear 221. Bearings are also installed at both ends of the gear transmission shaft 2, and the second gears 221 are installed on the bearing brackets at both ends. The second gear 221 and the first gear are connected by gear meshing to achieve transmission.

[0045] The second gear limiting structure 222 is mainly used to limit the rotation of the second gear 221. Further, the second gear limiting structure 222 includes a stopper 223 installed on the end surface of the second gear 221, a first limit adjustment block 224 and a second limit adjustment block 225 circumferentially arranged on the second gear 221, and a swing assembly 226 arranged between the first limit adjustment block 224 and the second limit adjustment block 225 and rotatable between the first limit adjustment block 224 and the second limit adjustment block 225 for blocking the stopper 223 and the second gear 221 connected to the stopper 223 from rotating.

[0046] Specifically, the stopper 223 is disposed on the end surface of the second gear 221 close to the swing assembly 226. A first limit adjustment block 224 and a second limit adjustment block 225 are also disposed around the second gear 221 to limit the swing angle of the swing assembly 226. It can be imagined that when the swing assembly 226 swings, it will be limited by the stopper 223 and the first limit adjustment block 224 or the stopper 223 and the second limit adjustment block 225, thereby limiting the rotation of the second gear 221.

[0047] Furthermore, the swing assembly 226 includes: a swing block 2262; a swing shaft 2261 plugged into the swing block 2262 and used for the swing block 2262 to swing; and the swing shaft 2261 is installed on a mold frame of the plastic mold.

[0048] It can be seen that the swinging limit of the swinging assembly 226 is the limit of the swinging block 2262. It can also be understood that when the swinging is fast, it will be limited by the block 223 and the first limit adjustment block 224 or the block 223 and the second limit adjustment block 225, thereby limiting the rotation of the second gear 221.

[0049] Furthermore, the swing block 2262 at least includes a first blocking surface 22621, a second blocking surface 22622, and a shifting surface 22623 connected to the first blocking surface 22621 and the second blocking surface 22622;

[0050] The shifting surface 22623 defines at least one shifting opening 22624 for the stopper 223 to shift the swing block 2262 .

[0051] Specifically, the swing block 2262 can be a first blocking surface 22621 restricted by the first limit adjustment block 224, and a second blocking surface 22622 restricted by the block 223, or the swing block 2262 can be a first blocking surface 22621 restricted by the block 223, and a second blocking surface 22622 restricted by the second limit adjustment block 225, thereby restricting the rotation of the second gear 221.

[0052] On this basis, the swing block 2262 also includes a shifting surface 22623, and a shifting opening 22624 is opened on the shifting surface 22623, so that when the stopper 223 passes through the swing block 2262, the swing block 2262 can be shifted through the shifting opening 22624, and the stopper 223 and the second gear 221 can be rotated at the same time.

[0053] It should be understood that if the second gear 221 of the gear transmission structure 2 can achieve the extension or retraction of the tooth core 311 by only less than one circle in the forward or reverse direction, there is no need to set the toggle opening 22624 of the toggle surface 22623. If it exceeds one circle, the toggle opening 22624 is set, which can not only realize the swing block 2262 to swing in a certain direction, but also realize the restriction of the swing block 2262 by the subsequent stopper 223 and the first limit adjustment block 224 or the second limit adjustment block 225.

[0054] It is also understandable that the diameter of the second gear 221 can be set large enough, so that the second gear 221 can rotate less than one circle to ensure the extension and retraction distance of the tooth core 311. However, considering that the diameter of the second gear 221 is large enough, other parts of the plastic mold are interfered with, and the toggle port 22624 is set so that the second gear 221 rotates several circles to achieve the extension and retraction distance of the tooth core 311.

[0055] Furthermore, in order to ensure that the stopper 223 does not swing in the opposite direction after the swing block 2262 is moved, a first clamping hole 2263 and a second clamping hole 2264 are provided on the end surface of the swing block 2262 away from the second gear 221. The first clamping hole 2263 and the second clamping hole 2264 are located on both sides of the movement, and the swing assembly 226 also includes a glass bead screw 2265 installed on the plastic mold frame, which is used to clamp the first clamping hole 2263 or the second clamping hole 2264.

[0056] It is understandable that, if the stopper 223 moves the moving opening 22624 of the swing block 2262, after a circle of rotation, the stopper 223 should be in contact with one of the first blocking surface 22621 and the second blocking surface 22622, and the other blocking surface should be in contact with its corresponding limit adjustment block to achieve the limit. After the swing block 2262 rotates, the stopper 223 needs to move the moving opening 22624 of the swing block 2262 again and continue to rotate, then the limit of the swing block 2262 cannot be achieved. Obviously, by setting the first clamping hole 2263 and the second clamping hole 2264 on both sides of the swing block 2262, and then setting the glass ball screw 2265 on the plastic mold frame, after the swing block 2262 is moved by the stopper 223, the glass ball screw is plugged into the first clamping hole 2263 or the second clamping hole 2264, thereby preventing the swing block 2262 from swinging in the opposite direction.

[0057] Furthermore, the first limit adjustment block 224 and the second limit adjustment block 225 are respectively provided with waist-shaped grooves 2241 , and are fixed by bolts inserted into the waist-shaped grooves 2241 of the first limit adjustment block 224 and the second limit adjustment block 225 .

[0058] Specifically, the waist groove 2241 can adjust the first limit adjustment block 224 and the second limit adjustment block 225 to a certain extent, thereby changing the limited swing angle of the swing block 2262. It can be understood that the control of the angle of the swing block 2262 also changes the limit of the rotation angle of the second gear 221.

[0059] It should also be noted that the surfaces where the first and second limit adjustment blocks 225 contact the swing block 2262 are arc-shaped to avoid damage to the first blocking surface 22621 and the second blocking surface of the swing block 2262.

[0060] It should be noted that the second gear limiting structure 222 limits the rotation angle of the third gear 312 on the side wall of the core sleeve 31 by limiting the rotation angle of the second gear 221. The second gear limiting structure 222 can limit the rotation angle of the second gear 221 by setting the toggle surface 22623 and the toggle opening 22624, the first limit adjustment block 224 and the second limit adjustment block 225 in the waist groove 2241, and the diameter of the second gear 221. The present application achieves a more reasonable limit on the rotation angle of the second gear 221 by adjusting the above-mentioned multiple adjustment methods.

[0061] By limiting the rotation angle of the third gear 312, the distance that the core 311 moves along the axis of the core sleeve 31 is limited. The core extension structure 3 includes a core sleeve 31 with a core 311 at one end and a third gear 312 disposed on the side wall of the core sleeve 31 and meshing with the second gear 221 and used to drive the core 311 to move along the axis of the core sleeve 31. It can be understood that the rotation of the second gear 221 drives the rotation of the third gear 312, and the rotation of the third gear 312 drives the core 311 of the core sleeve 31 to move along the axis of the core sleeve 31.

[0062] The rotation of the third gear 312 drives the core 311 of the core sleeve 31 to move along the axis of the core sleeve 31, which is also achieved through other parts of the core extension structure 3. Specifically, the core extension structure 3 also includes: a push rod assembly 33 located in the core sleeve 31; a threaded copper sleeve 32 sleeved on the core sleeve 31; a fourth gear 321 is also provided on the outer wall of the threaded copper sleeve 32, and a rack fixing block 34 meshing with the fourth gear 321 is also provided on the circumference of the threaded copper sleeve 32 to limit the rotation of the threaded copper sleeve 32; an external thread 313 is provided on the side wall of the core sleeve 31 at the position of the threaded copper sleeve 32, and an internal thread (not shown in the figure) connected to the external thread is provided on the inner wall of the threaded copper sleeve 32, so that when the third gear 312 is driven to rotate, the external thread 313 of the core sleeve 31 moves along the internal thread of the threaded copper sleeve 32 along the axis of the core sleeve 31.

[0063] It can be seen that the fourth gear 321 is provided on the threaded copper sleeve 32, and a rack fixing block 34 is provided around the threaded copper sleeve 32 to fix the threaded copper sleeve 32. The threaded copper sleeve 32 and the core sleeve 31 are connected through the external thread 313 and the internal thread. When the second gear 221 rotates, the third gear 312 rotates, and the core sleeve 31 rotates. The core sleeve 31 rotates, and the threaded copper sleeve 32 is fixed by the rack fixing block 34, so that the external thread 313 of the core sleeve 31 is screwed out or screwed into the internal thread of the threaded copper sleeve 32.

[0064] It can be understood that the rotation angle of the third gear 312 is related to the distance of the thread being screwed out or screwed in. For example, when the third gear 312 rotates one circle, the external thread 313 of the core sleeve 31 is screwed out by 7 mm.

[0065] Furthermore, the push rod assembly 33 specifically includes: a push rod 331; a push rod head 3311 is provided at a position of a core sleeve 31 with a core 311 at one end of the push rod 331, and a limit assembly 332 for controlling the rotation of the push rod 331 is provided at the end away from the core sleeve 31 with the core 311.

[0066] Specifically, the ejector head 3311 in the ejector 331 is used for subsequent mold opening and ejection of the product. The limit assembly 332 is used to limit the rotation of the ejector 331. It can be understood that when the plastic mold is closed, one end of the core sleeve 31 with the core 311 is flush with the ejector head 3311. When the mold is opened, the core sleeve 31 is retracted, the core 311 is also retracted, and the ejector head 3311 ejects the product.

[0067] Furthermore, a square block (not shown in the figure) is provided at one end of the push rod 331 away from the push rod head 3311 , and the limiting assembly 332 includes a clamping block 1 3321 and a clamping block 2 3322 symmetrically arranged and clamped to the square block for limiting the rotation of the push rod 331 .

[0068] It can be understood that a square block is provided on the top rod 331, and the clamping block 1 3321 and the clamping block 2 3322 have the same structure and are both provided with a clamping groove, and the rotation of the top rod 331 is limited by clamping.

[0069] It can be understood that the gear transmission shaft 1, the gear transmission shaft 2, the first limit adjustment block 224, the second limit adjustment block 225, the glass bead screw 2265, and the rack fixing block 34 are all installed on several mold frames in the plastic mold to achieve their fixation.

[0070] It should also be pointed out that in order to control the distance that the core 311 of the core sleeve 31 extends or retracts, the present application mainly sets the transmission ratio between the first gear, the second gear 221, and the third gear 312. Of course, in addition to this, the distance that the core 311 of the core sleeve 31 extends or retracts is also affected by multiple factors such as the external thread 313 in the core extension structure 3 and the internal thread in the threaded copper sleeve 32, the first limit adjustment block 224 and the second limit adjustment block 225 in the second gear limit structure 222. In a preferred embodiment provided in the present application, the diameter of the second gear 221 is larger than the diameter of the third gear 312, and smaller than the diameter of the first gear. Specifically, the transmission ratio between the first gear, the second gear 221, and the third gear 312 is 3:1:2.

[0071] In an actual application scenario provided by the present application, the transmission ratio between the first gear, the second gear 221, and the third gear 312 is set to 3:1:2, the first blocking surface 22621 of the swing block 2262 of the swing assembly 226 is limited by the first limit adjustment block 224, and the second blocking surface 22622 is limited by the block 223, and the tooth core 311 of the tooth core extension structure 3 is flush with the ejector head 3311 of the ejector 331, that is, the plastic mold is in a closed state. When the mold is opened, when the tooth core 311 needs to be retracted to a set distance, the motor 1 drives the chain to rotate clockwise, the first gear rotates clockwise with the chain drive, the second gear 221 rotates counterclockwise, and the third gear 312 of the tooth core sleeve 31 rotates clockwise. The needle rotates, and the core 311 of the core sleeve 31 begins to retract; during this process, after the second gear 221 rotates counterclockwise for one circle, the stopper 223 of the second gear 221 rotates to the position of the dial opening 22624 of the swing block 2262, and the swing block 2262 is dialed. After the swing block 2262 is dialed, the bead screw 2265 is engaged with the first card interface, and then the stopper 223 continues to rotate counterclockwise with the second gear 221. During this rotation, the stopper 223 rotates to the first blocking surface 22621 of the swing block 2262, and then the stopper 223 pushes the first blocking surface 22621 of the swing block 2262 until the second blocking surface 22622 of the swing block 2262 is connected to the second limit adjustment block 225. It is understandable that when the stopper 223 is connected to the first blocking surface 22621 and the second blocking surface 22622 is connected to the second limit adjustment block 225, the core 311 of the core sleeve 31 is just retracted to the set distance along the axis of the core sleeve 31. On the contrary, it is the mold closing process of the plastic mold, that is, the core 311 of the core sleeve 31 is just flush with the top rod head 3311. It is also understandable that the second gear 221 of the gear transmission structure 2 in the present application can be meshed with the third gear 312 of the two core extension structures 3 at the same time, thereby realizing the molding of a multi-hole product with threads in the plastic mold.

[0072] It should be noted that 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A precise stop-reset mechanism for a plastic mold gear threading structure, comprising a motor, a gear transmission structure connected to the motor and driven by the motor, and a tooth core extension structure connected to the gear transmission structure, characterized in that: The gear transmission structure includes a first gear transmission component and a second gear transmission component, the second gear component includes at least a second gear, a second gear limiting structure is provided around the second gear, the core extension structure includes at least a core sleeve with a core at one end and a third gear provided on the side wall of the core sleeve and meshing with the second gear for driving the core to move along the axis of the core sleeve, the second gear limiting structure limits the rotation angle of the third gear on the side wall of the core sleeve by limiting the rotation angle of the second gear, and limits the distance the core moves along the axis of the core sleeve by limiting the rotation angle of the third gear.

2. The precise stop-reset mechanism for the plastic mold gear thread structure according to claim 1, characterized in that: The second gear limiting structure includes a stopper installed on the end face of the second gear, a first limit adjustment block and a second limit adjustment block circumferentially arranged on the second gear, and a swing component arranged between the first limit adjustment block and the second limit adjustment block and rotatable between the first limit adjustment block and the second limit adjustment block for blocking the stopper and the second gear connected to the stopper from rotating.

3. The precise stop and reset mechanism of the plastic mold gear thread structure according to claim 2, characterized in that: The swing assembly specifically comprises: Swing Block; A swing shaft plugged into the swing block and used for the swing block to swing; The swing shaft is installed on the mold frame of the plastic mold.

4. The precise stop-reset mechanism for the plastic mold gear thread structure according to claim 3, characterized in that: The swing block at least comprises a first blocking surface, a second blocking surface and a shifting surface connected to the first blocking surface and the second blocking surface; The shifting surface is provided with at least one shifting opening for the stopper to shift the swinging block.

5. The precise stop-reset mechanism for the plastic mold gear thread structure according to claim 4, characterized in that: A first snap-in hole and a second snap-in hole are also provided on the end face of the swing block away from the second gear. The first snap-in hole and the second snap-in hole are located on both sides of the toggle port. The swing assembly also includes a glass bead screw installed on the plastic mold frame for snapping into the first snap-in hole or the second snap-in hole.

6. The precise stop-reset mechanism for the plastic mold gear threading structure according to claim 2, characterized in that: The first limit adjustment block and the second limit adjustment block are respectively provided with waist-shaped grooves, and are fixed by bolts inserted into the waist-shaped grooves of the first limit adjustment block and the second limit adjustment block.

7. The precise stop-reset mechanism for the plastic mold gear threading structure according to claim 1, characterized in that: The tooth core extension structure also includes: A push rod assembly located within the core sleeve; A threaded copper sleeve sleeved on the core sleeve; The outer wall of the threaded copper sleeve is also provided with a fourth gear, and the circumference of the threaded copper sleeve is also provided with a rack fixing block meshing with the fourth gear to limit the rotation of the threaded copper sleeve; The side wall of the core sleeve is provided with an external thread at the position of the threaded copper sleeve, and the inner wall of the threaded copper sleeve is provided with an internal thread connected to the external thread, so that when the third gear is driven to rotate, the external thread of the core sleeve follows the internal thread of the threaded copper sleeve to achieve movement along the axis of the core sleeve.

8. The precise stop and reset mechanism of the plastic mold gear thread structure according to claim 7, characterized in that: The ejector assembly at least comprises an ejector; A push rod head is provided at a position of a core sleeve with a core near one end of the push rod, and a limiting component for controlling the rotation of the push rod is provided at the end away from the core sleeve with the core.

9. The precise stop-reset mechanism for the plastic mold gear threading structure according to claim 8, characterized in that: A square block is provided at one end of the push rod away from the push rod head, and the limiting assembly comprises a first clamping block and a second clamping block symmetrically arranged and clamped to the square block, so as to limit the rotation of the push rod.

10. The precise stop-reset mechanism for the plastic mold gear threading structure according to claim 1, characterized in that: The diameter of the second gear is larger than the diameter of the third gear and smaller than the diameter of the first gear.

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