Compression spring connected force bidirectional T-slot adaptive core pulling structure and core pulling method

Abstract

The present invention discloses a compression spring-connected force bidirectional T-slot adaptive core pulling structure and a core pulling method thereof, which are applied to the core decomposition and combination core pulling of a U-shaped elbow with a large inclination and bending radius and a long straight section of the socket part in the product, and include a U-shaped core, a slider and a limit device, one end of the U-shaped core is opposite to the dynamic model cavity, and the other end is respectively connected to the slider and the limit device, the slider is respectively connected to the oil cylinder connector and the limit device, and the oil cylinder connector is connected to the external oil cylinder. The present invention mainly utilizes the oil cylinder to cooperate with the linear spring compression and the dovetail groove rubbing action to pull the decomposed core in steps, and at the same time utilizes the reverse force of the spring to make the core petal block move left and right in the T-slot of the guide seat, forming the core adaptive composite movement according to the shape of the plastic part, so that the core pulling and the avoidance action of the core insert are continuous. It has the advantages of less space occupation, simple structure, fewer parts, reliable movement, short plastic part production cycle, and high efficiency.

Description

Technical Field

[0001] The invention relates to a core pulling structure, belonging to the field of injection molds, and in particular to a compression spring connected power bidirectional T-slot adaptive core pulling structure. Background Art

[0002] In plastic material molding products, a large number of elbow products are used to connect water supply and drainage pipes. In the current mold design, there are many core pulling actions and molding methods used in the production of various elbow products. However, since the core pulling of the inner curved part of the plastic elbow is limited by the straight section of the socket, the rotation angle of the inner curved part is limited. In order to achieve the purpose of smoothly pulling the core of the inner curved part from the straight section socket, many elbow products currently adopt the method of reducing the diameter of the inner curved part (i.e., the water passing diameter) in design. Although this can achieve the purpose of making the inner curved part smaller and increasing its rotatable angle, and then achieve the goal of pulling the core from the connected straight section socket, the method of reducing the diameter of the inner curved part (i.e., the water passing diameter) has a practical problem of reduced water flow, increased water pressure, and longer water supply time. The actual processing result brought about by the extension is that the transmission power of the water supply source needs to be increased, that is, the output power of the water supply system needs to be increased, which increases the energy consumption and the cost investment of water supply facilities.

[0003] Therefore, there is an urgent need for a structure that can solve the problem of smooth core extraction of the elbow part of the plastic part when the diameter of the inner bend part of the elbow and the straight section socket are equal, so as to solve the above practical problems and the cost increase burden brought by them. Summary of the invention

[0004] The object of the present invention is to provide a compression spring connecting force bidirectional T-slot adaptive core pulling structure and a core pulling method thereof, so as to solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A compression spring-connected bidirectional T-slot adaptive core-pulling structure, comprising a U-shaped core, a slider connected to the U-shaped core, and a limiting device respectively connected to the U-shaped core and the slider; the U-shaped core comprises a left half U-shaped core, a right half U-shaped core, a left half U-shaped core petal block, a right half U-shaped core petal block, a left T-block, a right T-block and a guide seat; the left half U-shaped core petal block is arranged on the inner side of the left half U-shaped core, and is correspondingly connected to the inner side of the left half U-shaped core in a sliding fit; the right half U-shaped core petal block is arranged on the inner side of the right half U-shaped core, and is correspondingly connected to the right half U The upper end of the left T-block is fastened to the tail end of the left half U-shaped core petal block by a locating pin and a screw, and the upper end of the right T-block is fastened to the tail end of the right half U-shaped core petal block by a locating pin and a screw, and the lower ends of the left T-block and the right T-block are both slidably connected with the guide seat; the guide seat is located below the tail ends of the left half U-shaped core petal block and the right half U-shaped core petal block, and is connected to the limiting device, and the limiting device is located below the slider and the U-shaped core, and is respectively connected to the guide seat of the U-shaped core and the bottom of the slider.

[0007] The above technical solution further comprises a cylinder connector connected to the slider, wherein the cylinder connector is connected to an external cylinder;

[0008] When in use, the front end of the U-shaped core is opposite to the dynamic model cavity provided in the dynamic mold plate, and the rear end is respectively connected to the slider and the limit device. The slider is connected to the external cylinder through the cylinder connector. Under the driving action of the external cylinder, the U-shaped core is driven by the cylinder connector and the slider to move back and forth along the core pulling direction of the U-shaped core along with the limit device, thereby cooperating with the drawing in and out of the dynamic model cavity to realize the injection molding and core pulling demolding of the U-shaped elbow plastic product.

[0009] Furthermore, in the above technical solution, it also includes a bracket for supporting the U-shaped core, slider, cylinder connector and limit device; the U-shaped core, slider, cylinder connector and limit device are all located in a U-shaped slide groove provided in the bracket, and the bracket is fastened to the side of the movable template facing the U-shaped core by screws, and the U-shaped slide groove of the bracket is connected to the movable model cavity on the movable template, and the guide seat of the U-shaped core is slidably matched with the U-shaped slide groove of the bracket.

[0010] Further in the above technical solution, one end of the slider is detachably connected to the cylinder connecting head, and the other end is detachably connected to the tail ends of the left half U-shaped core and the right half U-shaped core of the U-shaped core respectively; the slider is also detachably connected to the limit device, and the cylinder connecting head is detachably connected to the external cylinder.

[0011] Furthermore, in the above technical scheme, the limiting device includes a spring, a connecting rod, a spring stop block and a limiting nut; the spring stop block is fastened to the bottom of the slider by a screw and is also sleeved on the connecting rod, the connecting rod passes through the spring stop block, and one end of the connecting rod is threadedly connected to the guide seat, and the other end is threadedly connected to the limiting nut, the spring is sleeved on the connection and is located between the guide seat and the spring stop block, and one end of the spring abuts against the guide seat, and the other end abuts against the spring stop block, the spring is used to apply pressure to the left half U-shaped core petal block and the right half U-shaped core petal block of the U-shaped core when the slider drives the U-shaped core to pull the core in the initial state, so that the left half U-shaped core petal block and the right half U-shaped core petal block do not move with the slider along the core pulling direction of the U-shaped core.

[0012] Furthermore, in the above technical solution, a threaded through hole is provided on the side of the guide seat facing the connecting rod, and two pin holes are provided on the side of the guide seat away from the connecting rod. The threaded through hole is used for threadedly fastening with the connecting rod, and the pin hole is used for fastening and fitting the guide pin, and the guide pin is used for slidingly fitting with the cavity countersunk hole provided on the dynamic model cavity.

[0013] Furthermore, in the above technical solution, a T-shaped slide groove is also provided on the guide seat, and the T-shaped slide groove is perpendicular to the U-shaped slide groove on the bracket, and the T-shaped slide groove is used to slide with the lower ends of the left T-shaped block and the right T-shaped block of the U-shaped core.

[0014] Further in the above technical solution, the T-shaped slide groove and the U-shaped slide groove are perpendicular to each other, and the sliding direction of the left T-shaped block and the right T-shaped block of the U-shaped core in the T-shaped slide groove in the guide seat is perpendicular to the sliding direction of the guide seat of the U-shaped core in the U-shaped slide groove in the bracket;

[0015] The sliding direction of the guide seat of the U-shaped core in the U-shaped groove in the bracket is consistent with the movement direction of the left half U-shaped core, the left half U-shaped core petal block, the right half U-shaped core, the right half U-shaped core petal block and the slider, the cylinder connector and the limit device in the U-shaped groove in the bracket, and is the same as the core pulling direction.

[0016] Furthermore, in the above technical solution, an oblique dovetail groove is respectively provided on the side of the left half U-shaped core facing the right half U-shaped core and on the side of the right half U-shaped core facing the left half U-shaped core;

[0017] An oblique dovetail protrusion is respectively provided on one side of the left half U-shaped core petal block facing the left half U-shaped core and on one side of the right half U-shaped core petal block facing the right half U-shaped core;

[0018] The left half U-shaped core petal block is slidably arranged in the slanted dovetail groove provided on the left half U-shaped core through the slanted dovetail protrusion provided on it, and is slidably matched with the left half U-shaped core;

[0019] The right half U-shaped core petal block is slidably arranged in the oblique dovetail groove provided on the right half U-shaped core through the oblique dovetail protrusion provided on it, and is slidably matched with the right half U-shaped core.

[0020] The present invention also provides a method for core pulling of a U-shaped elbow plastic product with a large internal slope and bending radius and a long straight section of the socket part by using the above-mentioned compression spring-connected force bidirectional T-slot adaptive core pulling structure, comprising the following steps:

[0021] S1. Preparation for core pulling: that is, after the U-shaped elbow plastic product to be core pulled is injection molded on the plastic mold matching the compression spring-connected force bidirectional T-slot adaptive core pulling structure, the plastic mold is opened to prepare for the subsequent core pulling operation;

[0022] S2, the first step of core pulling: the left and right halves of the U-shaped core are completely pulled out from the U-shaped elbow plastic product;

[0023] First, start the external cylinder to pull the slider backward through the external cylinder, and then the slider drives the U-shaped core to retreat a certain distance, so that the left and right halves of the U-shaped core are completely pulled out of the U-shaped elbow plastic product under the pull of the slider, thus completing the first step of core pulling;

[0024] In this core pulling process, when the left and right half U-shaped cores have not completely separated from the U-shaped elbow plastic product, the spring of the limit device is in a compressed state, and the connecting rod and the support spring stopper of the limit device are in an air-avoiding state. The support spring stopper will not pull the connecting rod to move, and the connecting rod will not pull the guide seat. Therefore, the left and right half U-shaped core petals of the U-shaped core are in a compressed state and do not move with the slider. They can only slide left and right in the guide seat in a direction perpendicular to the core pulling movement of the U-shaped core through the left and right T-blocks connected to their respective tail ends;

[0025] During the core pulling process, when the left and right half U-shaped cores are completely separated from the U-shaped elbow plastic product, the spring of the limit device is in a relaxed state, and the left and right half U-shaped core petals of the U-shaped core are also in a relaxed state;

[0026] S3, the second step of core pulling: the front end bending parts of the left and right half U-shaped core petals of the U-shaped core are separated from the constraints of the U-shaped elbow plastic product, and are pulled out from the straight section of the U-shaped elbow plastic product;

[0027] First, continue to start the external cylinder to continue to pull the slider backward through the external cylinder, and then the slider continues to drive the U-shaped core to retreat a certain distance, so that the front end curved parts of the left and right half U-shaped core petals of the U-shaped core are pulled out from the straight section of the U-shaped elbow plastic product, and the second step of core pulling is completed;

[0028] During the core pulling process, when the vertical displacement vector value generated by the left and right half U-shaped core petals of the U-shaped core and the oblique dovetail groove guide of the left and right half U-shaped core meet the requirement that the front end curved parts of the left and right half U-shaped core petals are separated from the straight section of the U-shaped elbow plastic product, the restriction of the straight section of the U-shaped elbow plastic product on the front end curved parts of the left and right half U-shaped core petals can be separated;

[0029] During the core pulling process, the spring of the limit device is in a relaxed state, and the left and right half U-shaped core petals of the U-shaped core are also in a relaxed state and can move with the slider;

[0030] S4, the third step of core pulling: completely pull out the left and right half U-shaped core petals of the U-shaped core from the U-shaped elbow plastic product;

[0031] First, continue to start the external oil cylinder, continue to pull the slider backward through the external oil cylinder, and then the slider continues to drive the U-shaped core backward. At the same time, the support spring block of the limit device drives the connecting rod to pull the guide seat, and then the guide seat drives the left and right half U-shaped core petals of the U-shaped core to retreat until the left and right half U-shaped core petals of the U-shaped core are completely pulled out of the U-shaped elbow plastic product, that is, the third step of core pulling is completed;

[0032] During the core pulling process, the spring of the limit device is in a relaxed state, and the connecting rod and the support spring block of the limit device are in a compressed state, that is, the support spring block is in contact with the limit nut. When the slider continues to drive the U-shaped core backward, the slider will also pull the support spring block backward, the support spring block will pull the connecting rod backward, the connecting rod will pull the guide seat backward, and the guide seat will drive the left and right half U-shaped core petals of the U-shaped core backward, so the left and right half U-shaped core petals of the U-shaped core will move with the slider;

[0033] S5. Product demoulding: that is, when the U-shaped core is completely pulled out from the U-shaped elbow plastic product, the injection molding machine is driven to work, and the plastic mold ejector is driven by the injection molding machine to eject the U-shaped elbow plastic product from the plastic mold. Finally, the U-shaped core, slider and limit device are reset, waiting for the next core pulling cycle.

[0034] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0035] 1) Avoid the poor reliability and cooling problems of the traditional swing structure (tilted head structure);

[0036] 2) Avoid the problem of large space occupied by the rotating motion structure;

[0037] 3) Avoid the problems of complex assembly, instability and excessive parts of the external synchronous arc trajectory structure;

[0038] 4) This structure has the advantages of small space occupation, simple structure, few parts, reliable movement, short plastic parts production cycle and high efficiency.

[0039] The core pulling structure provided by the present invention is mainly a decomposition and combination core pulling of a core applied to a U-shaped elbow with a large inclination and bending radius and a long straight section of the socket part in a product. The innovation point is: by effectively utilizing the compression force of the spring to form a staged locking force, and connecting the cylinder core pulling power when the spring relaxes and returns to its position to form a power source for uninterrupted core pulling; at the same time, the oblique dovetail groove is utilized to generate a vertical left and right displacement when moving in the core pulling direction, so as to achieve the purpose of separating the inner arc part of the core from the product.

[0040] In summary, the present invention actually utilizes an oil cylinder in conjunction with a linear spring to compress the dovetail groove to pull out the decomposed core step by step. At the same time, due to the reverse force of the spring, the core petal block moves left and right in the T-slot in the guide seat, forming a core pulling method in which the core performs adaptive compound motion according to the shape of the plastic part, so that the entire core pulling and core insert avoidance actions are completed continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the assembly of the present invention;

[0042] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the middle U-shaped core from one of the viewing angles;

[0043] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the middle U-shaped core from another perspective;

[0044] Figure 4 It is a three-dimensional exploded view of the present invention;

[0045] Figure 5 This is a diagram of the initial state when the product core is pulled out according to the present invention;

[0046] Figure 6 for Figure 5 Front view of the core pulling structure;

[0047] Figure 7 The core pulling process of the product core pulling of the present invention Figure 1 ;

[0048] Figure 8 for Figure 7 Front view of the core pulling structure;

[0049] Fig. 9 The core pulling process of the product core pulling of the present invention Figure 2 ;

[0050] Fig.10 for Fig. 9 Front view of the core pulling structure;

[0051] Fig.11 The core pulling process of the product core pulling of the present invention Figure 3 ;

[0052] Fig.12 for Fig.11 Front view of the core pulling structure;

[0053] Fig.13 This is a diagram showing the completion state of the core pulling action when the product core is pulled out by the present invention;

[0054] Fig.14 for Fig.13 Front view of the core pulling structure;

[0055] Explanation of the reference numerals: 100, U-shaped core; 101, left half U-shaped core; 102, right half U-shaped core; 103, left half U-shaped core petal block; 104, right half U-shaped core petal block; 105, left T-block; 106, right T-block; 107, guide seat; 107b, threaded through hole; 107c, pin hole; 108, oblique dovetail groove; 109, oblique dovetail protrusion; 110, guide pin; 107a, T-shaped slide groove; 200, slider; 300, cylinder connector; 400, limit device; 401, spring; 402, connecting rod; 403, support spring stopper; 404, limit nut; 500, bracket; 501, slide groove; 600, movable template; 601, movable model cavity; 700, U-shaped elbow plastic product. DETAILED DESCRIPTION

[0056] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following further describes how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.

[0057] See also Figure 1As shown, the present invention provides a compression spring-connected bidirectional T-slot adaptive core-pulling structure, which is applied to the decomposition and combination core-pulling of the core of a U-shaped elbow plastic product 700 with a large slope and bending radius and a long straight section of the socket part, and includes a U-shaped core 100, a slider 200, a cylinder connector 300, a limit device 400 and a bracket 500; wherein the U-shaped core 100, the slider 200, the cylinder connector 300 and the limit device 400 are all located in the bracket 500, and the bracket 500 is used to support the U-shaped The core 100, the slider 200, the cylinder connector 300 and the limit device 400, and the bracket 500 are fastened to the side of the dynamic template 600 facing the U-shaped core 100 by screws. One end of the U-shaped core 100 is opposite to the dynamic model cavity 601 provided in the dynamic template 600, and the other end is respectively connected to the slider 200 and the limit device 400. The slider 200 is arranged above the limit device 400 and is respectively connected to the cylinder connector 300 and the limit device 400. The cylinder connector 300 is connected to an external cylinder (not shown in the figure).

[0058] When in use, the front end of the U-shaped core 100 is opposite to the dynamic model cavity 601 provided in the dynamic template 600, and the rear end is respectively connected to the slider 200 and the limit device 400. The slider 200 is connected to the external cylinder through the cylinder connector 300. Under the driving action of the external cylinder, the U-shaped core 100 is driven by the cylinder connector 300 and the slider 200 and moves back and forth in the bracket 500 along with the limit device 400, so as to achieve the withdrawal and extraction coordination with the dynamic model cavity 601, and realize the injection molding and core pulling demolding of the U-shaped elbow plastic product 700.

[0059] As a preferred embodiment of the present invention: Figures 2 to 4 As shown, the U-shaped core 100 comprises a left half U-shaped core 101, a right half U-shaped core 102, a left half U-shaped core petal block 103, a right half U-shaped core petal block 104, a left T-shaped block 105, a right T-shaped block 106 and a guide seat 107; the left half U-shaped core petal block 103 is arranged on the inner side of the left half U-shaped core 101, and is correspondingly connected to the inner side of the left half U-shaped core 101 by sliding cooperation, and the right half U-shaped core petal block 104 is arranged on the inner side of the right half U-shaped core 102, and is correspondingly connected to the right half T-shaped core 106. The inner side of the semi-U-shaped core 102 is slidably connected, the upper end of the left T-block 105 is fastened to the tail end of the left semi-U-shaped core petal block 103 by means of positioning pins and screws, the upper end of the right T-block 106 is fastened to the tail end of the right semi-U-shaped core petal block 104 by means of positioning pins and screws, and the lower ends of the left T-block 105 and the right T-block 106 are both slidably connected to the guide seat 107; the guide seat 107 is located below the tail ends of the left semi-U-shaped core petal block 103 and the right semi-U-shaped core petal block 104.

[0060] In this preferred example, one end of the slider 200 is detachably connected to the cylinder connecting head 300, and the other end is detachably connected to the tail ends of the left half U-shaped core 101 and the right half U-shaped core 102 of the U-shaped core 100, respectively. The cylinder connecting head 300 is detachably connected to the external cylinder, and the limiting device 400 is respectively connected to the slider 200 and the guide seat 107 of the U-shaped core 100.

[0061] In this preferred embodiment, see Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14 As shown, the limiting device 400 includes a spring 401, a connecting rod 402, a support spring stopper 403 and a limit nut 404; the support spring stopper 403 is fastened to the bottom of the slider 200 by screws, and is also sleeved on the connecting rod 402, the connecting rod 402 passes through the support spring stopper 403, and one end of the connecting rod 402 is threadedly connected to the guide seat 107, and the other end is threadedly connected to the limit nut 404, the spring 401 is sleeved on the connecting rod 402, and is located between the guide seat 107 and the support spring stopper 403. The spring 401 is arranged between the spring stopper 403, and one end of the spring 401 is abutted against the guide seat 107, and the other end is abutted against the support spring stopper 403; the spring 401 is used to apply pressure to the left half U-shaped core petal block 103 and the right half U-shaped core petal block 104 of the U-shaped core 100 when the slider 200 drives the U-shaped core 100 to pull the core in the initial state, so that the left half U-shaped core petal block 103 and the right half U-shaped core petal block 104 do not move along the core pulling direction of the U-shaped core 100 with the slider 200.

[0062] Specifically, in this preferred embodiment, refer to Figures 2 to 4 As shown, a threaded through hole 107b is provided on the side of the guide seat 107 facing the connecting rod 402. Figure 4 As shown, two pin holes 107c are provided on the side of the guide seat 107 away from the connecting rod 402, the threaded through hole 107b is used for threadedly fastening with the connecting rod 402, the pin hole 107c is used for fastening and installing the guide pin 110, and the guide pin 110 is used for slidingly fitting with the cavity countersunk hole (not shown in the figure) provided on the dynamic model cavity 601.

[0063] Specifically, in this preferred embodiment, refer to Figures 2 to 4 As shown, a T-shaped slot 107a is provided on the guide seat 107, and the T-shaped slot 107a is used to slide with the lower ends of the left T-shaped block 105 and the right T-shaped block 106 of the U-shaped core 100; see Figure 1As shown, a U-shaped groove 501 is also provided on the bracket 500, and the U-shaped core 100, the slider 200, the cylinder connector 300 and the limit device 400 are all located in the U-shaped groove 501 of the bracket 500, and the U-shaped groove 501 of the bracket 500 is interconnected with the dynamic model cavity 601 on the dynamic template 600, and the guide seat 107 of the U-shaped core 100 is slidably connected with the U-shaped groove 501 of the bracket 500.

[0064] More specifically, in this preferred embodiment, refer to Figure 1 As shown, the T-shaped slot 107a is perpendicular to the U-shaped slot 501, and the sliding direction of the left T-shaped block 105 and the right T-shaped block 106 of the U-shaped core 100 in the T-shaped slot 107a in the guide seat 107 is perpendicular to the sliding direction of the guide seat 107 of the U-shaped core 100 in the U-shaped slot 501 in the bracket 500; the sliding direction of the guide seat 107 of the U-shaped core 100 in the U-shaped slot 501 in the bracket 500 is perpendicular to the left half U-shaped core 101, the left half U-shaped core petal block 103, and the right half U-shaped core 100. The movement directions of the semi-U-shaped core 102, the right semi-U-shaped core petal block 104, the slider 200, the cylinder connector 300 and the limit device 400 are consistent with each other in the U-shaped groove 501 in the bracket 500; that is, the sliding direction of the guide seat 107 in the U-shaped groove 501 in the bracket 500 is consistent with the core pulling direction of the U-shaped core 100, and the guide seat 107 can slide along the core pulling direction in the U-shaped groove 501 of the bracket 500, and the left T-block 105 and the right T-block 106 can slide in the T-groove 107a of the guide seat 107.

[0065] More specifically, in this preferred embodiment, refer to Figure 4 As shown, an oblique dovetail groove 108 is respectively provided on the side of the left half U-shaped core 101 facing the right half U-shaped core 102 and the side of the right half U-shaped core 102 facing the left half U-shaped core 101; an oblique dovetail protrusion 109 is respectively provided on the side of the left half U-shaped core petal block 103 facing the left half U-shaped core 101 and the side of the right half U-shaped core petal block 104 facing the right half U-shaped core 102; the left half U-shaped core petal block 103 is slidably disposed in the slanted dovetail groove 108 provided on the left half U-shaped core 101 through the slanted dovetail protrusion 109 provided thereon, and is correspondingly connected to the left half U-shaped core 101 by mutual sliding cooperation; the right half U-shaped core petal block 104 is slidably disposed in the slanted dovetail groove 108 provided on the right half U-shaped core 102 through the slanted dovetail protrusion 109 provided thereon, and is correspondingly connected to the right half U-shaped core 102 by mutual sliding cooperation.

[0066] The present invention also provides a method for core pulling of a U-shaped elbow plastic product 700 having a large internal slope and bending radius and a long straight section of the socket part based on the above-mentioned compression spring-connected force bidirectional T-slot adaptive core pulling structure, which specifically comprises the following steps:

[0067] S1. Preparation for core pulling: that is, after the U-shaped elbow plastic product 700 to be core pulled is injection molded on the plastic mold matching the compression spring-connected force bidirectional T-slot adaptive core pulling structure, the plastic mold is opened and ready for subsequent core pulling operations;

[0068] S2, the first step of core pulling: the left and right half U-shaped cores 101 and 102 of the U-shaped core 100 are completely pulled out from the U-shaped elbow plastic product 700. The specific operation steps are as follows:

[0069] First, the external oil cylinder is started to work, and the slider 200 is pulled back by the external oil cylinder, and then the slider 200 drives the U-shaped core 100 to retreat a certain distance, so that the left and right half U-shaped cores 101 and 102 of the U-shaped core 100 are completely pulled out from the U-shaped elbow plastic product 700 under the pulling of the slider 200, that is, the first step of core pulling is completed;

[0070] During this core pulling process, when the left and right half U-shaped cores 101, 102 have not completely separated from the U-shaped elbow plastic product 700, the spring 401 of the limiting device 400 is in a compressed state, and the connecting rod 402 and the support spring stopper 403 of the limiting device 400 are in an air-avoiding state. The support spring stopper 403 will not pull the connecting rod 402 to move, and the connecting rod 402 will not pull the guide seat 107. Therefore, the left and right half U-shaped core petals 103, 104 of the U-shaped core 100 are in a compressed state and do not move with the slider 200. They can only slide left and right in the guide seat 107 in a direction perpendicular to the core pulling movement of the U-shaped core 100 through the left and right T-blocks 105, 106 connected to their respective tail ends. See Figure 5 and Figure 6 As shown;

[0071] During the core pulling process, when the left and right half U-shaped cores 101 and 102 are completely separated from the U-shaped elbow plastic product 700, the spring 401 of the limiting device 400 is in a relaxed state, and the left and right half U-shaped core petals 103 and 104 of the U-shaped core 100 are also in a relaxed state. Figure 7 and Figure 8 As shown;

[0072] S3, the second step of core pulling: the front end curved parts of the left and right half U-shaped core petals 103, 104 of the U-shaped core 100 are separated from the constraints of the U-shaped elbow plastic product 700, and are pulled out from the straight section of the U-shaped elbow plastic product 700. The specific operation steps are as follows:

[0073] First, the external oil cylinder is started to continue to pull the slider 200 backward through the external oil cylinder, and then the slider 200 continues to drive the U-shaped core 100 to retreat a certain distance, so that the front end curved parts of the left and right half U-shaped core petals 103 and 104 of the U-shaped core 100 are pulled away from the straight section of the U-shaped elbow plastic product 700, and the second step of core pulling is completed;

[0074] During the core pulling process, when the vertical displacement vector value generated by the left and right half U-shaped core petals 103 and 104 of the U-shaped core 100 through the guiding cooperation with the oblique dovetail grooves of the left and right half U-shaped cores 101 and 102 satisfies the front end curved parts of the left and right half U-shaped core petals 103 and 104 to separate from the straight section of the U-shaped elbow plastic product 700, the restriction of the straight section of the U-shaped elbow plastic product 700 on the front end curved parts of the left and right half U-shaped core petals 103 and 104 can be separated;

[0075] During the core pulling process, the spring 401 of the stopper 400 is in a relaxed state, and the left and right half U-shaped core petals 103 and 104 of the U-shaped core 100 are also in a relaxed state and can move with the slider 200, see Figure 7 and Figure 8 As shown;

[0076] S4, the third step of core pulling: that is, completely pulling out the left and right half U-shaped core petals 103 and 104 of the U-shaped core 100 from the U-shaped elbow plastic product 700. The specific operation steps are as follows:

[0077] First, continue to start the external oil cylinder to continue to pull the slider 200 backward through the external oil cylinder, and then the slider 200 continues to drive the U-shaped core 100 backward. At the same time, the support spring stopper 403 of the limiting device 400 contacts the limiting nut 404 and drives the connecting rod 402 to pull the guide seat 107 backward, and then the guide seat 107 drives the left and right half U-shaped core petal blocks 103 and 104 of the U-shaped core 100 backward until the left and right half U-shaped core petal blocks 103 and 104 of the U-shaped core 100 are completely pulled out of the U-shaped elbow plastic product 700, that is, the third step of core pulling is completed;

[0078] During the core pulling process, the spring 401 of the limit device 400 is in a relaxed state, and the connecting rod 402 of the limit device 400 and the support spring stopper 403 are in a compressed state, that is, the support spring stopper 403 is in contact with the limit nut 404. When the slider 200 continues to drive the U-shaped core 100 to retreat, the slider 200 will also pull the support spring stopper 403 to retreat, the support spring stopper 403 will pull the connecting rod 402 to retreat, the connecting rod 402 will pull the guide seat 107 to retreat, and the guide seat 107 will drive the left and right half U-shaped core petal blocks 103 and 104 of the U-shaped core 100 to retreat, so the left and right half U-shaped core petal blocks 103 and 104 of the U-shaped core 100 will move together with the slider 200, see Figures 9 to 14 As shown;

[0079] S5, product demoulding: that is, when the U-shaped core 100 is completely pulled out from the U-shaped elbow plastic product 700, the injection molding machine is driven to work, and the plastic mold ejector is driven by the injection molding machine to eject the U-shaped elbow plastic product 700 from the plastic mold (i.e., the movable mold cavity 601), and finally the U-shaped core 100, the slider 200 and the limit device 400 are reset to wait for the next core pulling cycle.

[0080] Finally, it should be noted that the above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A compression spring connected force bidirectional T-slot adaptive core pulling structure, characterized in that: It comprises a U-shaped core (100), a slider (200) connected to the U-shaped core (100), and a limiting device (400) respectively connected to the U-shaped core (100) and the slider (200); The U-shaped core (100) comprises a left half U-shaped core (101), a right half U-shaped core (102), a left half U-shaped core petal block (103), a right half U-shaped core petal block (104), a left T-shaped block (105), a right T-shaped block (106) and a guide seat (107); the left half U-shaped core petal block (103) is arranged on the inner side of the left half U-shaped core (101) and is slidably connected to the inner side of the left half U-shaped core (101); the right half U-shaped core petal block (104) is arranged on the inner side of the right half U-shaped core (102) and is slidably connected to the inner side of the right half U-shaped core (102); the upper end of the left T-shaped block (105) is fastened to the left half U-shaped core (101) by a positioning pin and a screw. The tail end of the semi-U-shaped core petal block (103), the upper end of the right T-block (106) is fastened to the tail end of the right semi-U-shaped core petal block (104) by means of positioning pins and screws, the lower ends of the left T-block (105) and the right T-block (106) are both slidably connected with the guide seat (107), the guide seat (107) is located below the tail ends of the left semi-U-shaped core petal block (103) and the right semi-U-shaped core petal block (104), and is connected to the limiting device (400), the limiting device (400) is located below the slider (200) and the U-shaped core (100), and is respectively connected to the guide seat (107) of the U-shaped core (100) and the bottom of the slider (200); An oblique dovetail groove (108) is respectively provided on the side of the left half U-shaped core (101) facing the right half U-shaped core (102) and the side of the right half U-shaped core (102) facing the left half U-shaped core (101); An oblique dovetail protrusion (109) is respectively provided on one side of the left half U-shaped core petal block (103) facing the left half U-shaped core (101) and one side of the right half U-shaped core petal block (104) facing the right half U-shaped core (102); The left half U-shaped core petal block (103) is slidably arranged in the slanted dovetail groove (108) provided on the left half U-shaped core (101) through the slanted dovetail protrusion (109) provided on it, and is slidably matched with the left half U-shaped core (101); The right half U-shaped core petal block (104) is slidably arranged in the slanted dovetail groove (108) provided on the right half U-shaped core (102) through the slanted dovetail protrusion (109) provided on it, and is slidably matched with the right half U-shaped core (102); The limiting device (400) comprises a spring (401), a connecting rod (402), a spring stopper (403) and a limiting nut (404); the spring stopper (403) is fastened to the bottom of the slider (200) by screws and is also sleeved on the connecting rod (402); the connecting rod (402) passes through the spring stopper (403), and one end of the connecting rod (402) is threadedly connected to the guide seat (107), and the other end is threadedly connected to the limiting nut (404); the spring (401) is sleeved on the connecting rod (402) and is located at the guide seat (107). Between the guide seat (107) and the support spring stopper (403), one end of the spring (401) is in contact with the guide seat (107), and the other end is in contact with the support spring stopper (403), and the spring (401) is used to apply pressure to the left half U-shaped core petal block (103) and the right half U-shaped core petal block (104) of the U-shaped core (100) when the slider (200) drives the U-shaped core (100) to pull the core in the initial state, so that the left half U-shaped core petal block (103) and the right half U-shaped core petal block (104) do not move along the core pulling direction of the U-shaped core (100) with the slider (200); A T-shaped slide groove (107a) is also provided on the guide seat (107), and the T-shaped slide groove (107a) and the U-shaped slide groove (501) on the bracket (500) are perpendicular to each other, and the T-shaped slide groove (107a) is used to slide with the lower ends of the left T-shaped block (105) and the right T-shaped block (106) of the U-shaped core (100).

2. The compression spring connecting force bidirectional T-slot adaptive core pulling structure according to claim 1 is characterized in that: It also includes an oil cylinder connector (300) connected to the slider (200), and the oil cylinder connector (300) is connected to an external oil cylinder; When in use, the front end of the U-shaped core (100) is opposite to the dynamic mold cavity (601) provided in the dynamic mold plate (600), and the rear end is respectively connected to the slider (200) and the limiting device (400); the slider (200) is connected to the external cylinder via the cylinder connector (300); under the driving action of the external cylinder, the U-shaped core (100) is driven by the cylinder connector (300) and the slider (200) to move back and forth along the core pulling direction of the U-shaped core (100) along with the limiting device (400), so as to achieve the pulling in and out coordination with the dynamic mold cavity (601), and realize the injection molding and core pulling demoulding of the U-shaped elbow plastic product (700).

3. The compression spring connecting force bidirectional T-slot adaptive core pulling structure according to claim 2 is characterized in that: The invention also comprises a bracket (500) for supporting the U-shaped core (100), the slider (200), the cylinder connector (300) and the limit device (400); the U-shaped core (100), the slider (200), the cylinder connector (300) and the limit device (400) are all located in a U-shaped slide groove (501) provided in the bracket (500); the bracket (500) is fastened to a side of the movable template (600) facing the U-shaped core (100) by screws, and the U-shaped slide groove (501) of the bracket (500) is connected to the movable mold cavity (601) on the movable template (600); the guide seat (107) of the U-shaped core (100) is connected to the U-shaped slide groove (501) of the bracket (500) in a sliding manner.

4. The compression spring connecting force bidirectional T-slot adaptive core pulling structure according to claim 3 is characterized by: One end of the slider (200) is detachably connected to the cylinder connector (300), and the other end is detachably connected to the tail ends of the left half U-shaped core (101) and the right half U-shaped core (102) of the U-shaped core (100). The slider (200) is also detachably connected to the limiting device (400), and the cylinder connector (300) is detachably connected to the external cylinder.

5. The compression spring connecting force bidirectional T-slot adaptive core pulling structure according to claim 1 is characterized in that: A threaded through hole (107b) is provided on the side of the guide seat (107) facing the connecting rod (402), and two pin holes (107c) are provided on the side of the guide seat (107) away from the connecting rod (402). The threaded through hole (107b) is used for threadedly fastening with the connecting rod (402), and the pin hole (107c) is used for fastening and installing a guide pin (110), and the guide pin (110) is used for slidingly fitting with a cavity countersunk hole provided on the dynamic model cavity (601).

6. The compression spring connecting force bidirectional T-slot adaptive core pulling structure according to claim 1, characterized in that: The sliding direction of the left T-block (105) and the right T-block (106) of the U-shaped core (100) in the T-shaped slide groove (107a) in the guide seat (107) is perpendicular to the sliding direction of the guide seat (107) of the U-shaped core (100) in the U-shaped slide groove (501) in the bracket (500); The sliding direction of the guide seat (107) of the U-shaped core (100) in the U-shaped slide groove (501) in the bracket (500) is consistent with the movement direction of the left half U-shaped core (101), the left half U-shaped core petal block (103), the right half U-shaped core (102), the right half U-shaped core petal block (104) of the U-shaped core (100) and the slider (200), the cylinder connector (300) and the limit device (400) in the U-shaped slide groove (501) in the bracket (500), and is the same as the core pulling direction.

7. A method for core pulling of a U-shaped elbow plastic product (700) having a large internal slope and bending radius and a long straight section at the socket part using the compression spring-connected force bidirectional T-slot adaptive core pulling structure as described in claim 1, characterized in that: The following steps are included: S1, core pulling preparation: that is, after the U-shaped elbow plastic product (700) to be core pulled is injection molded on a plastic mold matching the compression spring-connected power bidirectional T-slot adaptive core pulling structure, the plastic mold is opened to prepare for the subsequent core pulling operation; S2, the first step of core pulling: completely pulling out the left and right half U-shaped cores (101, 102) of the U-shaped core (100) from the U-shaped elbow plastic product (700); First, the external oil cylinder is started to work, and the slider (200) is pulled backward by the external oil cylinder, and then the slider (200) drives the U-shaped core (100) to retreat a certain distance, so that the left and right half U-shaped cores (101, 102) of the U-shaped core (100) are completely pulled out from the U-shaped elbow plastic product (700) under the pulling of the slider (200), thus completing the first step of core pulling; During the core pulling process, when the left and right half U-shaped cores (101, 102) have not completely separated from the U-shaped elbow plastic product (700), the spring (401) of the limiting device (400) is in a compressed state, and the connecting rod (402) and the support spring stopper (403) of the limiting device (400) are in an air-avoiding state. The support spring stopper (403) will not pull the connecting rod (402) to move, and the connecting rod (402) will not pull the guide seat (107). Therefore, the left and right half U-shaped core petal blocks (103, 104) of the U-shaped core (100) are in a compressed state and do not move with the slider (200). They can only slide left and right in the guide seat (107) in a direction perpendicular to the core pulling movement of the U-shaped core (100) through the left and right T-shaped blocks (105, 106) connected at their respective tail ends. During the core pulling process, when the left and right half U-shaped cores (101, 102) are completely separated from the U-shaped elbow plastic product (700), the spring (401) of the limiting device (400) is in a relaxed state, and the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) are also in a relaxed state; S3, the second step of core pulling: the front end curved parts of the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) are separated from the constraints of the U-shaped elbow plastic product (700) and pulled away from the straight section of the U-shaped elbow plastic product (700); First, the external oil cylinder is started to continue to work, and the slider (200) is continuously pulled backward by the external oil cylinder, and then the slider (200) continues to drive the U-shaped core (100) to retreat a certain distance, so that the front end curved parts of the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) are pulled away from the straight section of the U-shaped elbow plastic product (700), and the second step of core pulling is completed; During the core pulling process, when the vertical displacement vector value generated by the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) through the guiding cooperation with the oblique dovetail grooves of the left and right half U-shaped cores (101, 102) satisfies the requirement that the front end curved parts of the left and right half U-shaped core petals (103, 104) are separated from the straight section of the U-shaped elbow plastic product (700), the restriction of the straight section of the U-shaped elbow plastic product (700) on the front end curved parts of the left and right half U-shaped core petals (103, 104) can be separated; During the core pulling process, the spring (401) of the limiting device (400) is in a relaxed state, and the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) are also in a relaxed state and can move with the slider (200); S4, the third step of core pulling: completely pulling out the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) from the U-shaped elbow plastic product (700); First, the external oil cylinder is started to continue to pull the slider (200) backward through the external oil cylinder, and then the slider (200) continues to drive the U-shaped core (100) backward. At the same time, the spring stopper (403) of the limiting device (400) drives the connecting rod (402) to pull the guide seat (107), and then the guide seat (107) drives the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) to retreat until the left and right half U-shaped core petals (103, 104) of the U-shaped core (100) are completely pulled out of the U-shaped elbow plastic product (700), and the third step of core pulling is completed; During the core pulling process, the spring (401) of the limiting device (400) is in a relaxed state, and the connecting rod (402) and the spring stopper (403) of the limiting device (400) are in a compressed state, that is, the spring stopper (403) is in contact with the limiting nut (404). When the slider (200) continues to drive the U-shaped core (100) to retreat, the slider (200) will also pull the spring stopper (403). When the slide block (200) moves backward, the support spring stopper (403) will pull the connecting rod (402) backward, the connecting rod (402) will pull the guide seat (107) backward, and the guide seat (107) will drive the left and right half U-shaped core petal blocks (103, 104) of the U-shaped core (100) to move backward, so the left and right half U-shaped core petal blocks (103, 104) of the U-shaped core (100) will move together with the slider (200); S5, product demoulding: that is, when the U-shaped core (100) is completely pulled out from the U-shaped elbow plastic product (700), the injection molding machine is driven to work, and the plastic mold ejector is driven by the injection molding machine to eject the U-shaped elbow plastic product (700) from the plastic mold. Finally, the U-shaped core (100), the slider (200) and the limit device (400) are reset, and wait for the next core pulling cycle.

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