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

Abstract

The utility model relates to an accurate stopping and resetting mechanism of a gear twisted tooth structure of a plastic mould, 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 utility model relates to the field of plastic mould manufacturing, especially to a precise reset prevention mechanism of plastic mould gear tooth structure. BACKGROUND

[0002] In the field of plastic mould manufacturing, the reset prevention mechanism of gear tooth structure is the key component to ensure the accurate opening and closing of the mould. The design of such mechanism directly affects the quality and production efficiency of the product. In the prior art, the reset prevention of gear tooth structure can realize the extension and retraction of the tooth core through various structures. For example, through the oil cylinder and rack and pinion structure or through the motor and chain gear structure. Of course, in order to ensure the accuracy of the reset prevention mechanism, the extension and retraction of the tooth core can also be realized through the structure of servo motor and gear.

[0003] In the implementation of the prior art, the utility model person finds that:

[0004] In the process of realizing the extension and retraction of the tooth core through the structure of servo motor and gear, the servo motor can realize accurate control, but the gear structure connected with it cannot achieve accurate control of the distance of the extension and retraction of the tooth core when driven due to the influence of the precision of gear transmission matching, and the cost is relatively high. In the process of realizing the extension and retraction of the tooth core through the oil cylinder and rack or the motor and chain gear, the position control is controlled by the time of driving the rack by the oil cylinder or the time of rotating the chain driven by the motor, which is obviously not accurate enough and easy to cause the tooth core to extend and push out the jack head, which is easy to cause the product for molding on the tooth core to be pushed out, thereby causing unqualified production. In addition, the design of the rack is easy to interfere with other parts of the mould.

[0005] Therefore, the present application provides a technical solution with lower cost, which can accurately control the distance of the extension and retraction of the tooth core, to solve the technical problems of high cost, inaccurate position control and unreasonable mould design of the reset prevention mechanism in the prior art. SUMMARY

[0006] This part aims to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0007] In view of the above-mentioned problems, the utility model is proposed.

[0008] Therefore, the technical problem solved by the utility model is to provide a technical scheme with lower cost, rationality, and precise control of the distance of the tooth core extension and retraction to solve the technical problems of higher cost, inaccurate position control, and unreasonable mold design in the prior art.

[0009] To solve the above technical problems, the utility model solves them through the following technical scheme:

[0010] A precise reset mechanism of a plastic mold gear tooth extraction structure, comprising a motor, a gear transmission structure connected with the motor and driven by the motor, a tooth core extension structure connected with 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, the second gear being provided with a second gear limiting structure around the periphery, the tooth core extension structure comprising at least a tooth core sleeve provided with a tooth core at one end and a third gear provided on the side wall of the tooth core sleeve and engaged with the second gear for driving the tooth core to move along the axis of the tooth core sleeve, the second gear limiting structure limiting the rotation angle of the third gear on the side wall of the tooth core sleeve by limiting the rotation angle of the second gear, and limiting the distance of the tooth core moving along the axis of the tooth core sleeve by limiting the rotation angle of the third gear.

[0011] Further, the second gear limiting structure comprises a stop block mounted on the end face of the second gear, a first limiting adjustment block and a second limiting adjustment block arranged circumferentially on the second gear, and a swing assembly arranged between the first limiting adjustment block and the second limiting adjustment block and capable of rotating between the first limiting adjustment block and the second limiting adjustment block to block the rotation of the stop block and the second gear.

[0012] Further, the swing assembly specifically comprises: a swing block; a swing shaft inserted into the swing block for swinging the swing block; and the swing shaft is mounted on the mold frame of the plastic mold.

[0013] Further, the swing block comprises at least a first blocking surface, a second blocking surface, and a pushing surface connected with the first blocking surface and the second blocking surface.

[0014] The pushing surface is provided with at least one pushing opening for pushing the swing block.

[0015] Further, the end face of the swing block away from the second gear is further provided with a first clamping hole and a second clamping hole, the first clamping hole and the second clamping hole are located on both sides of the pushing opening, and the swing assembly further comprises a glass bead screw mounted on the mold frame of the plastic mold and used for clamping in the first clamping hole or the second clamping hole.

[0016] Further, the first limiting adjustment block and the second limiting adjustment block are respectively provided with a waist-shaped groove, and the waist-shaped groove is inserted into the first limiting adjustment block and the second limiting adjustment block by a bolt to realize fixation.

[0017] Further, the tooth core extension structure further comprises: a top rod assembly located in the tooth core sleeve; a threaded copper sleeve sleeved on the tooth core sleeve; the outer wall of the threaded copper sleeve is further provided with a fourth gear, and the threaded copper sleeve is further provided with a rack fixing block engaged with the fourth gear to limit the rotation of the threaded copper sleeve; the side wall surface of the tooth core sleeve is provided with external threads at the position of the threaded copper sleeve, and the inner wall of the threaded copper sleeve is provided with internal threads matched with the external threads, so that when the third gear is driven to rotate, the external threads of the tooth core sleeve move along the internal threads of the threaded copper sleeve in the axial direction of the tooth core sleeve.

[0018] Further, the top rod assembly specifically comprises: a top rod; a first sleeve and a second sleeve sleeved on the top rod; the top rod is provided with a top rod head at the position of the tooth core sleeve close to one end of the tooth core, and is provided with a limiting assembly for controlling the rotation of the top rod at the end of the tooth core away from the tooth core sleeve.

[0019] Further, the top rod is provided with a square block at the end away from the top rod head, and the limiting assembly comprises symmetrically arranged clamping blocks one and two clamped on the square block to limit the rotation of the top rod.

[0020] Further, the diameter of the second gear is greater than the diameter of the third gear and less than the diameter of the first gear.

[0021] The application provides a precise reset stopping mechanism of a plastic mold gear tooth extension structure, solves the problem that when the tooth core extension and retraction distance is controlled by a servo motor, the precision control of the tooth core extension and retraction distance cannot be achieved due to the influence of gear transmission matching precision, and the cost is high. Moreover, through the limiting of the second gear limiting structure on the second gear block, the rotation angle of the second gear is controlled, and then the tooth core extension distance and retraction distance are controlled, and then when the tooth core extends, only the end of the top rod head of the top rod assembly is parallel, and the product is not damaged by protruding. At the same time, the scheme avoids the problem of interference with other parts of the mold caused by the design of the rack. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor. Among them:

[0023] Fig. 1 The structure diagram of the precise reset stopping mechanism of the plastic mold gear tooth extension structure described in the embodiment of the present application;

[0024] Fig. 2 Structure diagram of the second gear transmission assembly according to the embodiments of the present application.

[0025] Fig. 3 Structure diagram of the second gear limiting structure according to the embodiments of the present application.

[0026] Fig. 4 Structure diagram of the tooth core extension structure according to the embodiments of the present application.

[0027] Fig. 5 Structure diagram of the ejector rod assembly according to the embodiments of the present application.

[0028] The names of the parts referred to by the respective reference numerals in the drawings are as follows:

[0029] 100 - precision reset mechanism of a gear tooth extension structure of a plastic mold;

[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 - stop 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 - pushing surface; 22624 - pushing opening; 2263 - first clamping hole; 2264 - second clamping hole; 2265 - glass bead screw;

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

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

[0036] 33 - ejector rod assembly; 331 - ejector rod; 3311 - ejector rod head; 332 - limiting assembly; 3321 - clamping block one; 3322 - clamping block two; 34 - rack fixing block. DETAILED DESCRIPTION

[0037] To make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0038] like Figs. 1-3 As shown, a precise stop-reset mechanism 100 for a plastic mold gear threading structure includes 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. The gear transmission structure 2 includes a first gear transmission component 21 and a second gear transmission component 22. The second gear component includes at least a second gear 221. A second gear limiting structure 222 is provided around the second gear 221. The core extension structure 3 includes at least a core sleeve 31 with a core 311 at one end and a third gear 312 provided on the side wall of the core sleeve 31 and engaged with the second gear 221 for driving the core 311 to move along the axis of the core sleeve 31. 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. 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.

[0039] Specifically, the present application provides a precise stop-reset mechanism 100 for a plastic mold gear thread structure. This mechanism precisely controls the distance between the extension and retraction of the thread core 311 when forming the threaded portion of a plastic molded product, thereby achieving cost-effective, reasonable, and precise control of the stop-reset mechanism for forming the threaded portion. As will be appreciated, inaccurate stop-reset control can lead to numerous problems, such as excessive extension or insufficient retraction, resulting in damage to the product, or insufficient retraction after extension or insufficient extension after retraction, resulting in the inability to form the product's thread.

[0040] In this application, motor 1 provides power for the transmission of gear transmission structure 2, which is then driven by motor 1. The gear transmission then causes the core extension structure 3 to extend. It is also understood that conventional methods of controlling the core extension distance by timing the motor's rotation and stopping can easily lead to excessive or insufficient distance. In this application, the motor and the second gear's limiting mechanism ensure precise control of the distance.

[0041] The first gear transmission assembly 21 and the motor 1 are connected by a chain to realize transmission. Specifically, the first gear transmission assembly 21 comprises a gear transmission shaft I and a first gear installed at one end of the gear transmission shaft I. Of course, the other end of the gear transmission shaft I is also provided with a chain tooth for transmission between the motor 1 through the chain.

[0042] It should be pointed out that the transmission rod is also provided with bearings at both ends, and the first gear and the chain tooth are installed between the bearings at both ends.

[0043] The first gear transmission assembly 21 and the second gear transmission assembly 22 are connected through gear meshing. Specifically, the second gear transmission assembly 22 comprises a gear transmission shaft II for fixing the second gear 221, and the gear transmission shaft II is also provided with bearings at both ends, and the second gear 221 is installed on the bearing supports at both ends. The second gear 221 and the first gear are connected through gear meshing to realize transmission.

[0044] 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 comprises a stop block 223 installed on the end face of the second gear 221, a first limiting adjusting block 224 and a second limiting adjusting block 225 arranged circumferentially on the second gear 221, and a swing assembly 226 arranged between the first limiting adjusting block 224 and the second limiting adjusting block 225 and capable of rotating between the first limiting adjusting block 224 and the second limiting adjusting block 225 to block the stop block 223 and the rotation of the second gear 221.

[0045] Specifically, the stop block 223 is arranged on the end face of the second gear 221 close to the swing assembly 226. The first limiting adjusting block 224 and the second limiting adjusting block 225 are also arranged on the periphery of the second gear 221 to limit the angle of swing of the swing assembly 226. As can be imagined, when the swing assembly 226 swings, it will be limited by the stop block 223 and the first limiting adjusting block 224 or the stop block 223 and the second limiting adjusting block 225, thereby limiting the rotation of the second gear 221.

[0046] Further, the swing assembly 226 comprises a swing block 2262, a swing shaft 2261 inserted into the swing block 2262 for swinging of the swing block 2262, and the swing shaft 2261 is installed on the mold frame of the plastic mold.

[0047] As can be seen, the swing assembly 226 is limited in swing, i.e. the swing block 2262 is limited. It can also be understood that when the swing assembly 226 swings, it will be limited by the stop block 223 and the first limiting adjusting block 224 or the stop block 223 and the second limiting adjusting block 225, thereby limiting the rotation of the second gear 221.

[0048] Further, the swing block 2262 at least includes a first blocking surface 22621, a second blocking surface 22622, and a pushing surface 22623 connected to the first blocking surface 22621 and the second blocking surface 22622;

[0049] The pushing surface 22623 is provided with at least one pushing opening 22624 for pushing the stop block 223 to swing the swing block 2262.

[0050] Specifically, the swing block 2262 can be limited by the first limiting adjustment block 224 at the first blocking surface 22621 and by the stop block 223 at the second blocking surface 22622, or the swing block 2262 can be limited by the stop block 223 at the first blocking surface 22621 and by the second limiting adjustment block 225 at the second blocking surface 22622, thereby limiting the rotation of the second gear 221.

[0051] On this basis, the swing block 2262 further includes a pushing surface 22623 provided with a pushing opening 22624 for pushing the stop block 223 to swing the swing block 2262 when passing through the swing block 2262, thereby achieving the rotation of the stop block 223 through the second gear 221.

[0052] 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 rotating only one positive or negative direction, then the pushing opening 22624 of the pushing surface 22623 is not required. If more than one rotation is required, then the pushing opening 22624 is provided to achieve the swing of the swing block 2262 in a certain direction and the subsequent limitation of the swing block 2262 by the stop block 223 and the first limiting adjustment block 224 or the second limiting adjustment block 225.

[0053] It can also be understood that the diameter of the second gear 221 can be large enough to ensure that the extension and retraction distance of the tooth core 311 can be achieved by rotating the second gear 221 less than one revolution. However, considering that a large diameter of the second gear 221 may interfere with other parts of the plastic mold, the setting of the pushing opening 22624 allows the second gear 221 to rotate several times to achieve the extension and retraction distance of the tooth core 311.

[0054] Further, in order to ensure that the stop block 223 does not swing in the opposite direction after pushing the swing block 2262, a first clamping hole 2263 and a second clamping hole 2264 are provided on the end face 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 pushing surface, and the swing assembly 226 further includes a glass bead screw 2265 installed on the mold frame of the plastic mold for clamping in the first clamping hole 2263 or the second clamping hole 2264.

[0055] It can be understood that if the block 223 pushes the push port 22624 of the swing block 2262, after rotating a circle back, the block 223 should be in contact with one of the first blocking surface 22621 and the second blocking surface 22622, and the other blocking surface is in contact with the corresponding limiting adjustment block to realize limiting. After the swing block 2262 rotates, the block 223 needs to push the push port 22624 of the swing block 2262 again, and continue to rotate, which cannot realize the limiting of the swing block 2262. 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 bead screw 2265 on the plastic mold frame, after the swing block 2262 is pushed by the block 223, the glass bead screw is inserted and connected with the first clamping hole 2263 or the second clamping hole 2264, thereby avoiding the swing block 2262 from swinging in the opposite direction.

[0056] Further, the first limiting adjustment block 224 and the second limiting adjustment block 225 are respectively provided with a waist-shaped groove 2241, and are fixed by being inserted into the waist-shaped groove 2241 of the first limiting adjustment block 224 and the second limiting adjustment block 225 through a bolt.

[0057] Specifically, the setting of the waist-shaped groove 2241 can enable the first limiting adjustment block 224 and the second limiting adjustment block 225 to be adjusted to a certain extent, thereby changing the swinging angle of the swing block 2262. It can be understood that the control of the angle of the swing block 2262 also changes the limitation of the rotation angle of the second gear 221.

[0058] It should be pointed out that the surface of the first limiting adjustment block and the second limiting adjustment block 225 in contact with the swing block 2262 is a circular arc, so as to avoid damaging the first blocking surface 22621 and the second blocking surface of the swing block 2262.

[0059] It should be pointed out that the second gear limiting structure 222 limits the rotation angle of the third gear 312 on the side wall of the tooth core sleeve 31 by limiting the rotation angle of the second gear 221. The limitation of the rotation angle of the second gear 221 by the second gear limiting structure 222 can be adjusted by the setting of the push port 22624 of the push surface 22623, the setting of the position of the first limiting adjustment block 224 and the second limiting adjustment block 225 in the waist-shaped groove 2241, and the setting of the diameter of the second gear 221. The above-mentioned multiple adjustment modes are adjusted to realize more reasonable limiting of the rotation angle of the second gear 221 by the second gear limiting structure 222.

[0060] The third gear 312 rotation angle is limited, the distance of the dental core 311 moving along the dental core sleeve 31 axis is limited. The dental core extension structure 3 includes a dental core sleeve 31 with the dental core 311 at one end and a third gear 312 on the dental core sleeve 31 side wall, which is engaged with the second gear 221, used to drive the dental core 311 moving along the dental core sleeve 31 axis. It can be understood that the second gear 221 rotation drives the third gear 312 rotation, the third gear 312 rotation drives the dental core 311 of the dental core sleeve 31 moving along the dental core sleeve 31 axis.

[0061] The third gear 312 rotation drives the dental core 311 of the dental core sleeve 31 moving along the dental core sleeve 31 axis is also realized by other parts of the dental core extension structure 3. Specifically, the dental core extension structure 3 further includes: a top rod assembly 33 in the dental core sleeve 31; a threaded copper sleeve 32 sleeved on the dental core sleeve 31; the outer side wall of the threaded copper sleeve 32 is further provided with a fourth gear 321, and the circumferential of the threaded copper sleeve 32 is further provided with a rack fixed block 34 engaged with the fourth gear 321, used to limit the rotation of the threaded copper sleeve 32; the side wall surface of the dental core sleeve 31 is provided with an external thread 313 at the position of the threaded copper sleeve 32, and the inner wall of the threaded copper sleeve 32 is provided with an internal thread (not shown in the figure) engaged with the external thread, used to realize the movement of the external thread 313 of the dental core sleeve 31 along the dental core sleeve 31 axis direction along the internal thread of the threaded copper sleeve 32 when the third gear 312 is driven to rotate.

[0062] It can be seen that the threaded copper sleeve 32 is provided with the fourth gear 321, and the threaded copper sleeve 32 is provided with the rack fixed block 34 around the circumference, so as to realize the fixation of the threaded copper sleeve 32 through the rack fixed block 34. The diameter of the threaded copper sleeve 32 and the dental core sleeve 31 is connected through the external thread 313 and the internal thread. When the second gear 221 rotates, the third gear 312 rotates, and the dental core sleeve 31 rotates. The dental core sleeve 31 rotates, and the threaded copper sleeve 32 is fixed by the rack fixed block 34, so that the external thread 313 of the dental core sleeve 31 is rotated out or rotated into the internal thread of the threaded copper sleeve 32.

[0063] It can be understood that the angle of the third gear 312 rotation is related to the distance of the thread rotation out or rotation in, for example, the third gear 312 rotates one circle, and the external thread 313 of the dental core sleeve 31 is rotated out by 7mm.

[0064] Further, the top rod assembly 33 specifically includes: a top rod 331; the top rod 331 is provided with a top rod head 3311 at the position close to the dental core sleeve 31 with the dental core 311 at one end, and is provided with a limiting assembly 332 for controlling the rotation of the top rod 331 at the end away from the dental core sleeve 31 with the dental core 311.

[0065] Specifically, the ejector pin head 3311 is used for subsequent mold opening and product ejection. The limiting assembly 332 is used to limit the rotation of the ejector pin 331. It can be understood that when the plastic mold is closed, the tooth core sleeve 31 has one end of the tooth core 311 flush with the ejector pin head 3311, and when the mold is opened, the tooth core sleeve 31 is retracted, the tooth core 311 is also retracted, and the ejector pin head 3311 ejects the product.

[0066] Further, the ejector pin 331 is provided with a square block (not shown in the figure) at the end away from the ejector pin head 3311, and the limiting assembly 332 includes a symmetrically arranged clamping block one 3321 and a clamping block two 3322 clamped to the square block, for limiting the rotation of the ejector pin 331.

[0067] It can be understood that the square block is provided on the ejector pin 331, the clamping block one 3321 and the clamping block two 3322 have the same structure and are both provided with clamping grooves, and the rotation of the ejector pin 331 is limited by clamping.

[0068] It can be understood that the gear transmission shaft one, the gear transmission shaft two, the first limiting adjusting block 224, the second limiting adjusting block 225, the glass bead screw 2265, and the rack fixing block 34 are all installed on a plurality of mold frames in the plastic mold to achieve their fixation.

[0069] It should also be pointed out that in order to control the extension or retraction distance of the tooth core 311 of the tooth core sleeve 31, the transmission ratio between the first gear, the second gear 221 and the third gear 312 is set in the present application. Of course, in addition to this, the extension or retraction distance of the tooth core 311 of the tooth core sleeve 31 is also affected by various factors such as the external thread 313 in the tooth core extension structure 3, the internal thread in the threaded copper sleeve 32, the first limiting adjusting block 224 and the second limiting adjusting block 225 in the second gear limiting structure 222. In a preferred embodiment provided in the present application, the diameter of the second gear 221 is greater than the diameter of the third gear 312 and less 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.

[0070] In an actual application scenario provided by the application, the transmission ratio between the first gear, the second gear 221 and the third gear 312 is 3:1:2, the first blocking surface 22621 of the swing block 2262 of the swing assembly 226 is limited by the first limiting adjustment block 224, the second blocking surface 22622 is limited by the block 223, the core 311 of the core extension structure 3 is flush with the rod head 3311 of the rod 331, that is, the plastic mold is in a closed state, when the core 311 needs to be retracted by a set distance during mold opening, the motor 1 drives the chain to rotate clockwise, the first gear rotates clockwise with the chain transmission, the second gear 221 rotates counterclockwise, the third gear 312 of the core sleeve 31 rotates clockwise, and the core 311 of the core sleeve 31 starts to retract; during this process, after the second gear 221 rotates counterclockwise for one circle, the block 223 of the second gear 221 is turned to the position of the actuating port 22624 of the swing block 2262, the swing block 2262 is actuated, the swing block 2262 is actuated, the glass bead screw 2265 is clamped in the first clamping port, then the block 223 continues to rotate counterclockwise with the second gear 221, during this rotation, the block 223 is turned to the first blocking surface 22621 of the swing block 2262, then the block 223 pushes the first blocking surface 22621 of the swing block 2262 until the second blocking surface 22622 of the swing block 2262 is in contact with the second limiting adjustment block 225. It can be understood that when the block 223 is in contact with the first blocking surface 22621 and the second blocking surface 22622 is in contact with the second limiting adjustment block 225, the core 311 of the core sleeve 31 is retracted to a set distance along the axis of the core sleeve 31. Conversely, it is the mold closing process of the plastic mold, that is, the core 311 of the core sleeve 31 is flush with the rod head 3311. It can also be understood that the second gear 221 of the gear transmission structure 2 in the application can be engaged with the third gears 312 of two core extension structures 3 at the same time, thereby realizing the molding of multi-hole products with threads in the plastic mold.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the application and are not limiting. Although the application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the application, which should be covered in the scope of the claims of the application.

Claims

1. A precision stop-reset mechanism for a plastic mold gear thread structure, comprising a motor, a gear transmission structure connected to the motor and driven by the motor, and a thread core extension structure connected to the gear transmission structure, characterized in that: The gear transmission structure comprises a first gear transmission assembly and a second gear transmission assembly, the second gear assembly comprises at least a second gear, the second gear is provided with a second gear limiting structure around the periphery, the tooth core extension structure comprises at least a tooth core sleeve provided with a tooth core at one end and a third gear provided on the tooth core sleeve sidewall and engaged with the second gear for driving the tooth core to move along the tooth core sleeve axis, the second gear limiting structure limits the rotation angle of the third gear on the tooth core sleeve sidewall by limiting the rotation angle of the second gear, and limits the movement distance of the tooth core along the tooth core sleeve axis by limiting the rotation angle of the third gear.

2. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 1, wherein, The second gear limiting structure comprises a stop block mounted on the end face of the second gear, a first limiting adjustment block and a second limiting adjustment block circumferentially arranged on the second gear, and a swing assembly arranged between the first limiting adjustment block and the second limiting adjustment block and capable of rotating between the first limiting adjustment block and the second limiting adjustment block for blocking the stop block and the second gear.

3. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 2, wherein, The swing assembly specifically comprises: a swing block; a swing shaft inserted into the swing block for swinging of the swing block; the swing shaft is mounted on a mold frame of a plastic mold.

4. The precision non-return mechanism of the plastic mold gear tooth unclamping structure according to claim 3, wherein, The swing block comprises at least a first blocking surface, a second blocking surface and a pushing surface connected to the first blocking surface and the second blocking surface; the pushing surface is provided with at least one pushing opening for pushing the swing block.

5. The precision non-return mechanism for the plastic mold gear tooth unclamping structure as claimed in claim 4, wherein The end face of the swing block away from the end face of the second gear is further provided with a first clamping hole and a second clamping hole, the first clamping hole and the second clamping hole are located on both sides of the pushing opening, and the swing assembly further comprises a glass bead screw mounted on the mold frame of the plastic mold and used for clamping the first clamping hole or the second clamping hole.

6. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 2, wherein The first limiting adjustment block and the second limiting adjustment block are respectively provided with a waist-shaped groove, and the waist-shaped groove is inserted into the first limiting adjustment block and the second limiting adjustment block by a bolt to realize fixation.

7. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 1, wherein The tooth core extension structure further comprises: a top rod assembly located in the tooth core sleeve; a threaded copper sleeve sleeved on the tooth core sleeve; the outer sidewall of the threaded copper sleeve is further provided with a fourth gear, and the threaded copper sleeve is further provided with a rack fixing block engaged with the fourth gear to limit the rotation of the threaded copper sleeve; the sidewall surface of the tooth core sleeve is provided with external threads at the position of the threaded copper sleeve, and the inner wall of the threaded copper sleeve is provided with internal threads connected to the external threads, so that the external threads of the tooth core sleeve move along the internal threads of the threaded copper sleeve in the direction of the tooth core sleeve axis when the third gear is driven to rotate.

8. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 7, wherein The top rod assembly comprises at least a top rod; the top rod is provided with a top rod head at the position close to the tooth core sleeve provided with the tooth core, and is provided with a limiting assembly for controlling the rotation of the top rod at the position away from the tooth core sleeve provided with the tooth core.

9. The precision non-return mechanism for the plastic mold gear tooth unclamping structure according to claim 8, wherein, The top rod is provided with a square block at the end away from the top rod head, and the limiting assembly comprises a first clamping block and a second clamping block symmetrically arranged and clamped on the square block to limit the rotation of the top rod.

10. The precision non-return mechanism for the plastic mold gear tooth unclamping structure as claimed in claim 1, wherein The diameter of the second gear is greater than the diameter of the third gear and smaller than the diameter of the first gear.

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