A self-checking pressure relief device for injection molding feeding equipment

Abstract

The present invention discloses a self-checking pressure relief device for injection molding feeding equipment, which comprises: a sub-controller, a stroke trigger switch electrically connected to the sub-controller, the stroke trigger switch connected to a feeding rod, an electrical support, a first drive assembly mounted on the electrical support, a second drive assembly mounted on the first drive assembly, a collecting barrel mounted on the second drive assembly, a piston assembly mounted in the collecting barrel, a movable part mounted in the collecting barrel, an adjusting rod mounted in the movable part, a movable rod mounted on the adjusting rod, and other components. The movable part is started by the pressure difference between the inside and the outside, and then the collecting barrel is connected with the feeding barrel for pressure relief. Liquid is discharged by the piston assembly in cooperation with the adjusting rod and the movable rod, so that when the feeding barrel generates unstable pressure, the feeding barrel is pressure relieved, and the liquid raw material stored in the pressure relief is sent back to the feeding barrel at a corresponding time, and the collecting chamber can be conveniently cleaned by an external cleaning device.

Description

Technical Field

[0001] The invention relates to the field of injection molding technology equipment, and in particular to a self-checking pressure relief device for injection molding feeding equipment. Background Art

[0002] Existing injection molding feeding equipment generally includes a telescopic feeding rod with a spiral outer ring. The feeding rod is driven by a motor to rotate and is extended and retracted by a hydraulic rod or a motor. The front end of the feeding rod is a tapered pusher. For different molds, the feeding pressure and speed are different, so the equipment needs to be adjusted in advance when changing the mold.

[0003] In order to avoid excessive feeding pressure and instability, existing feeding equipment is generally equipped with a pressure relief valve and corresponding temporary storage pipelines and return pipelines. The current return is generally to extract the liquid raw materials in the return pipeline by the suction force formed when the feeding rod returns. However, this return method is overly dependent on the return of the feeding rod. If the return speed is too low and the stroke is too short, it may cause insufficient return. The return pipeline is generally not equipped with insulation and heating devices, which may cause blockage. It is too troublesome to send the raw materials in the return pipeline back through a pump, and then adjust the corresponding oil circuit of the hydraulic rod that drives the forward movement.

[0004] Also, the reflux pipeline used for temporary storage of refluxed raw material liquid needs to be replaced or cleaned after long-term use or when the raw material liquid formula changes to prevent residual raw material liquid from affecting the injection molding quality. For example, the colors of the two raw material liquids are different, and the residual raw material liquid mixes with the new liquid, resulting in color deviation. Therefore, the reflux pipeline / temporary storage cavity requires a convenient cleaning structure or replacement structure. At the same time, some injection molding equipment has a low degree of automation, or the data synchronization function of its equipment controller is poor. The external sub-controller cannot obtain accurate real-time data to adjust the pressure relief device, and compatibility with this type of injection molding equipment is also a problem that needs to be solved.

[0005] Therefore, there is an urgent need for a self-checking pressure relief device for injection molding feeding equipment that can solve one or more of the above problems. Summary of the invention

[0006] In order to solve one or more problems existing in the prior art, the present invention provides a self-checking pressure relief device for injection molding feeding equipment. The technical solution adopted by the present invention to solve the above problems is: a self-checking pressure relief device for injection molding feeding equipment, comprising: a secondary controller, the secondary controller is electrically connected to the injection molding equipment;

[0007] A stroke trigger switch, wherein the stroke trigger switch is fixedly mounted on the injection molding equipment, the stroke trigger switch is connected to the feeding rod of the injection molding equipment, and the stroke trigger switch is electrically connected to the secondary controller;

[0008] An electrical appliance support, the electrical appliance support is used to install electronic equipment, and the electrical appliance support is fixedly connected to a feeding barrel of an injection molding device;

[0009] A first drive assembly, which is fixedly mounted on the electrical support, wherein the power source of the first drive assembly is any one or more of a motor, a solenoid valve, and a hydraulic assembly, and the first drive assembly is used to slide the locking member and the driving member up and down;

[0010] A second drive assembly, wherein the second drive assembly is fixedly mounted on the first drive assembly, a connecting ring is fixedly connected to the outer side of the second drive assembly, a power source of the second drive assembly is any one or more of an electromagnet, a motor, and a hydraulic assembly, and the second drive assembly is used to lock the member or drive the member to slide up and down;

[0011] A support member, the support member is installed in the second driving assembly, the support member is provided with a mounting groove, and a spring is provided in the mounting groove;

[0012] A collecting cylinder, wherein the upper end surface of the collecting cylinder is provided with a liquid inlet hole, and a collecting chamber is provided on the collecting cylinder, the opening of the collecting chamber faces downward and is connected to the liquid inlet hole, the collecting cylinder is fixedly connected to the second driving assembly and the connecting ring, and the connecting ring seals the opening of the collecting chamber;

[0013] A connecting platform is provided on the outer surface of the collecting cylinder, a connecting hole communicating with the collecting chamber is provided on the connecting platform, a sealing member is installed in the connecting hole, a blocking member or a conveying member is installed in the connecting hole, the conveying member is provided with a conveying hole, the blocking member cooperates with the sealing member to seal the connecting hole, and the conveying member is used to connect with the outside world;

[0014] The blocking member is provided with a detection hole, and the inner end opening of the detection hole is connected to the sealing member;

[0015] A piston assembly, wherein the piston assembly is installed in the collecting chamber, the periphery of the piston assembly is tightly connected to the inner wall of the collecting chamber, the second driving assembly drives the piston assembly to reciprocate, and the upper end surface of the piston assembly is provided with a matching groove;

[0016] A movable part, wherein the movable part is provided with a through hole penetrating the upper and lower ends thereof, the upper end of the movable part is a connecting part, the shape of the connecting part matches the liquid inlet hole, a sealing display plate extending outward is provided at the lower side of the connecting part, the shape of the sealing display plate matches the matching groove, the connecting part is provided with a connecting pipe, the upper end pipe mouth of the connecting pipe is connected to the through hole, the lower end pipe mouth of the connecting pipe is connected to the lower side surface of the sealing display plate or is arranged at the lower side of the sealing display plate, the movable part is arranged in the collecting chamber, the piston assembly is sleeved on the movable part, the piston assembly is tightly connected to the movable part, and the lower end of the movable part abuts against the spring;

[0017] An adjusting rod, wherein the adjusting rod is provided with a heating portion, the position of the heating portion corresponds to the position of the collecting chamber, the adjusting rod is installed in the through hole, the adjusting rod passes through the supporting member and is connected to the first driving assembly and the electrical appliance support, and the first driving assembly locks or drives the adjusting rod to slide up and down;

[0018] A movable rod, the movable rod is fixedly mounted on the upper end of the adjusting rod, a ball head is provided at the upper end of the movable rod, the ball head is used to seal the upper end opening of the through hole, the ball head can extend to the outside of the liquid inlet hole, the rod body diameter of the movable rod is smaller than the diameter of the through hole, and a flow gap is provided between the rod body of the movable rod and the through hole;

[0019] The first drive assembly, the second drive assembly, and the electronic equipment in the electrical appliance support are electrically connected to the secondary controller.

[0020] Furthermore, a first step and a second step are sequentially arranged in the connecting hole, the sealing member is installed on the first step, the blocking member or the conveying member is installed on the second step, the blocking member is tightly connected to the sealing member, and the conveying member is tightly connected to the sealing member.

[0021] Furthermore, the sealing member is annular, and the end surface of the blocking member facing inward is a matching end surface, and the curvature of the matching end surface is consistent with the curvature of the side wall of the collection chamber.

[0022] Furthermore, the upper end opening of the through hole is provided with a second matching surface matching with the outer surface of the ball head.

[0023] Furthermore, it also includes: an isolation ring, which is sleeved on the lower end of the movable rod and is tightly connected to the side wall of the through hole.

[0024] Furthermore, the power source of the second driving assembly is an electromagnet, and a permanent magnet is fixedly mounted on the lower end of the piston assembly, and the permanent magnet is an aluminum nickel cobalt magnet.

[0025] Furthermore, the power source of the second driving component is a motor or a hydraulic component, a driving rod is installed on the second driving component, the upper end of the driving rod is fixedly connected to the piston component, and the lower end of the driving rod is received in the first driving component, or received in the first driving component and the electrical appliance support, and the motor or hydraulic component drives the driving rod to slide up and down.

[0026] Furthermore, the outer side surface of the connecting portion is a curved surface or an inclined surface, and the liquid inlet hole is provided with a first matching surface matching with the outer side surface of the connecting portion.

[0027] Furthermore, the edge of the matching groove is provided with an inclined surface or a curved surface inclined toward the outside.

[0028] Furthermore, the connecting platform and the connecting hole are at least provided with two, and a one-way valve is provided in the conveying member.

[0029] The beneficial value achieved by the present invention is: the present invention connects the above-mentioned sub-controller, stroke trigger switch, electrical support, first drive assembly, second drive assembly, support member, collection barrel, piston assembly and other components together through an ingenious structure, and sets a blocking member and a conveying member on the collection barrel, and cooperates with corresponding adjustment and control methods, so as to achieve that during injection molding feeding, the internal pressure of the feeding barrel is too large / unstable, and the movable parts of several pressure relief reflux devices are opened under the pressure difference, and the liquid raw material enters the collection chamber to reduce the internal pressure of the feeding barrel, thereby increasing the time for the staff to adjust the hydraulic circuit of the feeding rod and improving the fault tolerance redundancy;

[0030] The reset state of the feeding rod is detected by the stroke trigger switch, and then the secondary controller receives the output data of the injection molding equipment, obtains the position information of the feeding rod, and determines the timing of the pressure relief device to discharge liquid, such as: the feeding rod is reset and stopped (the device performs the discharge action), and the discharge action is stopped when the feeding rod moves forward, so as to discharge the raw material liquid entering the pressure relief tube in time;

[0031] After the injection molding and feeding are completed, when the feeding rod moves backward and resets, the second driving assembly drives the movable rod to move forward to open the through hole and the first driving assembly drives the piston assembly to reciprocate, and then cooperates with the feeding rod to move backward to reduce the internal pressure of the feeding barrel, so that the liquid raw material collected in the collection chamber is sprayed into the feeding barrel. In this process, the heating part on the adjusting rod is used to keep the liquid raw material warm to avoid condensation and blockage; by adjusting the distance between the piston assembly and the movable part, the internal pressure of the collection chamber is adjusted. Under the action of a larger internal pressure and a spring, the movable part can be made more difficult to be opened, so that the equipment can adapt to a larger feeding barrel pressure and will not be opened prematurely, thereby ensuring stability and improving the application scale;

[0032] The plugging member and the sealing member ensure that the collection chamber does not leak during operation. At the same time, the mating end surface on the plugging member can reduce the gap between the piston assembly and the connecting hole, ensuring that the piston assembly and the collection chamber are tightly connected, thereby reducing the risk of wear and leakage inside the piston assembly when passing through the connecting hole; the conveying member can be a one-way valve or a connecting one-way valve, and can be conveniently connected to an external high-pressure liquid / gas cleaning device through the conveying member to clean the collection chamber. The above greatly improves the practical value of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the present invention;

[0034] Figure 2 A top view of the present invention;

[0035] Figure 3 It is a cross-sectional view I of the working state of the present invention;

[0036] Figure 4 It is a partial enlarged view of the cross-sectional view I of the present invention;

[0037] Figure 5 It is a cross-sectional view I of the cleaning state of the present invention;

[0038] Figure 6 It is the cross-sectional view II of the present invention;

[0039] Figure 7 is a cross-sectional view of the piston assembly of the present invention when driven by a driving rod;

[0040] Figure 8 It is a partial enlarged view of state I of the present invention;

[0041] Fig. 9 It is a partial enlarged view of state II of the present invention;

[0042] Fig.10 It is a partial enlarged view of state III of the present invention;

[0043] Fig.11 It is a partial enlarged view of state IV of the present invention;

[0044] Fig.12 It is the installation schematic diagram of the present invention.

[0045] [Reference Signs]

[0046] 10···Device body 20···Injection pipeline 30···Feeding rod 40···Feeding cylinder 41···Heating device

[0047] 42···Hopper50···Feeding rod driving device60···Stroke trigger switch

[0048] 101···Electrical appliance support 201···First driving assembly 301···Second driving assembly 302···Driving rod

[0049] 310···Connecting ring 401···Supporting member 402···Mounting groove 410···Spring 501···Collecting tube

[0050] 502···Liquid inlet hole 503···First mating surface 510···Collecting chamber 520···Connecting platform

[0051] 521···Connection hole 522···First step 523···Second step 530···Sealing member

[0052] 540···blocking member 541···detection hole 542···matching end surface 550···transport member 551···transport hole

[0053] 601···Piston assembly 602···Matching groove 610···Permanent magnet 701···Moving part

[0054] 702···Connecting pipeline 703···Through hole 704···Second matching surface 710···Sealing display board

[0055] 720···Connecting part 801···Adjusting rod 810···Isolation ring 901···Movable rod

[0056] 910···Ball head 920···Flow gap. DETAILED DESCRIPTION

[0057] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from this description, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0058] like Figure 1-Figure 12 As shown, the present invention discloses a self-checking pressure relief device for injection molding feeding equipment, which comprises: a secondary controller, the secondary controller is electrically connected to the injection molding equipment;

[0059] A stroke trigger switch 60, wherein the stroke trigger switch 60 is fixedly mounted on the injection molding device, the stroke trigger switch 60 is connected to the feed rod 30 of the injection molding device, and the stroke trigger switch 60 is electrically connected to the secondary controller;

[0060] An electrical appliance support 101, the electrical appliance support 101 is used to install electronic equipment, and the electrical appliance support 101 is fixedly connected to a feeding barrel 40 of an injection molding device;

[0061] A first drive assembly 201, which is fixedly mounted on the electrical appliance support 101. The power source of the first drive assembly 201 is any one or more of a motor, a solenoid valve, and a hydraulic assembly. The first drive assembly 201 is used to lock the member and drive the member to slide up and down;

[0062] A second driving component 301, the second driving component 301 is fixedly mounted on the first driving component 201, a connecting ring 310 is fixedly connected to the outer side of the second driving component 301, the power source of the second driving component 301 is any one or more of an electromagnet, a motor, and a hydraulic component, and the second driving component 301 is used to lock the component or drive the component to slide up and down;

[0063] A support member 401, wherein the support member 401 is installed in the second driving assembly 301, and a mounting groove 402 is provided on the support member 401, and a spring 410 is provided in the mounting groove 402;

[0064] A collecting cylinder 501, wherein the upper end surface of the collecting cylinder 501 is provided with a liquid inlet hole 502, and the collecting cylinder 501 is provided with a collecting chamber 510, wherein the opening of the collecting chamber 510 faces downward and is connected to the liquid inlet hole 502, and the collecting cylinder 501 is fixedly connected to the second driving assembly 301 and the connecting ring 310, and the connecting ring 310 seals the opening of the collecting chamber 510;

[0065] A connecting platform 520 is provided on the outer surface of the collecting cylinder 501, and a connecting hole 521 communicating with the collecting chamber 510 is provided on the connecting platform 520, and a sealing member 530 is installed in the connecting hole 521, and a blocking member 540 or a conveying member 550 is installed in the connecting hole 521, and the conveying member 550 is provided with a conveying hole 551, and the blocking member 540 cooperates with the sealing member 530 to seal the connecting hole 521, and the conveying member 550 is used to connect with the outside world;

[0066] The blocking member 540 is provided with a detection hole 541, and the inner end opening of the detection hole 541 is connected to the sealing member 530;

[0067] A piston assembly 601, wherein the piston assembly 601 is installed in the collecting chamber 510, and the periphery of the piston assembly 601 is tightly connected to the inner wall of the collecting chamber 510, and the second driving assembly 301 drives the piston assembly 601 to reciprocate, and a matching groove 602 is provided on the upper end surface of the piston assembly 601;

[0068] A movable part 701, wherein the movable part 701 is provided with a through hole 703 penetrating the upper and lower ends thereof, the upper end of the movable part 701 is a connecting portion 720, the shape of the connecting portion 720 matches the liquid inlet hole 502, the lower side of the connecting portion 720 is provided with a sealing display plate 710 extending outward, the shape of the sealing display plate 710 matches the matching groove 602, the connecting portion 720 is provided with a connecting pipe 702, the upper end pipe mouth of the connecting pipe 702 is connected to the through hole 703, the lower end pipe mouth of the connecting pipe 702 is connected to the lower side surface of the sealing display plate 710 or is arranged on the lower side of the sealing display plate 710, the movable part 701 is arranged in the collecting chamber 510, the piston assembly 601 is sleeved on the movable part 701, the piston assembly 601 is tightly connected to the movable part 701, and the lower end of the movable part 701 abuts against the spring 410;

[0069] An adjusting rod 801, wherein the adjusting rod 801 is provided with a heating portion, the position of the heating portion corresponds to the position of the collecting chamber 510, the adjusting rod 801 is installed in the through hole 703, the adjusting rod 801 passes through the supporting member 401 and is connected to the first driving assembly 201 and the electrical appliance support 101, and the first driving assembly 201 locks or drives the adjusting rod 801 to slide up and down;

[0070] A movable rod 901, the movable rod 901 is fixedly mounted on the upper end of the adjusting rod 801, a ball head 910 is provided at the upper end of the movable rod 901, the ball head 910 is used to seal the upper end opening of the through hole 703, the ball head 910 can extend to the outside of the liquid inlet hole 502, the rod body diameter of the movable rod 901 is smaller than the diameter of the through hole 703, and a flow gap 920 is provided between the rod body of the movable rod 901 and the through hole 703;

[0071] The first driving assembly 201, the second driving assembly 301, and the electronic equipment in the electrical appliance support 101 are electrically connected to the secondary controller.

[0072] It should be noted that the mechanical transmission structure in the first drive assembly 201 and the second drive assembly 301 can be a push-pull structure or a gear structure, and the locking member can be locked or electromagnetically adsorbed. The secondary controller is a commonly used PLC controller or MCU controller, and the stroke trigger switch is generally a stroke limit trigger switch, which outputs a high level to the secondary controller after being triggered, and is normally a low level; when the injection molding equipment cannot output data about the feed rod, the stroke trigger switch is used to determine whether the feed rod is reset, and then the timing of discharging the raw material liquid back into the feed barrel is obtained. The discharge timing is generally when the feed rod triggers the stroke trigger switch (reset), and the stop timing is generally when the feed rod does not trigger the stroke trigger switch (that is, when the feed rod moves forward and the stroke trigger switch outputs a low level to the secondary controller).

[0073] When in working state, the blocking member 540 is installed in the connecting hole 521. When cleaning is required, the blocking member 540 is replaced with the conveying member 550. The conveying member 550 may be a one-way valve or connected to an external one-way valve. There are at least two connecting platforms 520 and connecting holes 521, and they are generally symmetrically arranged. When the conveying member 550 is a one-way valve, one is for output and the other is for input. The external cleaning equipment conveys cleaning liquid / gas to the collection chamber 510 through the pipeline via the conveying member 550 to clean the collection chamber 510. The cleaning equipment is composed of a commonly used high-pressure or low-pressure pump, pipeline, water tank / gas cylinder.

[0074] Specifically, Figure 3 , Figure 4As shown, the connection hole 521 is provided with a first step 522 and a second step 523 in sequence, the first step 522 is on the inside, and the second step 523 is on the outside, the sealing member 530 is installed on the first step 522, and the blocking member 540 or the conveying member 550 is installed on the second step 523, so that the sealing member 530 installed on the first step 522 is not subjected to the pressure of the component installed on the second step 523; the blocking member 540 is tightly connected with the sealing member 530, and the conveying member 550 is tightly connected with the sealing member 530. Further, the blocking member 540 is provided with a detection hole 541, the inner end opening of the detection hole 541 is connected with the sealing member 530, and the sealing state between the sealing member 530 and the blocking member 540 or the conveying member 550 can be judged by observation or insertion with a cotton swab. In addition, the sealing member 530 is annular, and the inner end face of the sealing member 540 is a mating end face 542, and the curvature of the mating end face 542 is consistent with the curvature of the side wall of the collecting chamber 510, so as to enable the piston assembly 601 to be in close contact with the mating end face 542 when passing through the connecting hole 521, thereby reducing the risk of leakage at the rear end and avoiding the formation of a groove or boss between the mating end face 542 and the inner opening of the connecting hole 521, thereby affecting the movement of the piston assembly 601.

[0075] It should be pointed out that in order to ensure that after the sealing member 540 is installed, the mating end face 542 can fit very closely with the inner wall of the collection chamber 510 to form a nearly integrated arc surface, a rotation alignment mark (not indicated in the drawings) is provided on the connecting platform 520 and the sealing member 540. With the cooperation of this mark, the installation depth and rotation angle of the sealing member 540 can be adjusted, thereby achieving a good fitting effect.

[0076] Specifically, Figure 8As shown, it also includes: an isolation ring 810, which is sleeved on the lower end of the movable rod 901, and the isolation ring 810 is tightly connected to the side wall of the through hole 703. The isolation ring 810 is used to isolate the liquid raw material from the adjusting rod 801 to prevent the liquid raw material from seeping into the hole wall of the adjusting rod 801 and the through hole 703. If the adjusting rod 801 is tightly connected to the through hole 703, the isolation ring 810 may not be provided; the isolation ring 810 can also be used to block the upper end of the connecting pipe 702. The specific application scenario is that the adjusting rod 801 extends outward so that the isolation ring 810 blocks the upper end of the connecting pipe 702. Then the piston assembly 601 moves forward to pressurize the collecting chamber 510, and then a small amount of residual liquid raw material will gather in the connecting pipe 702. At this time, the adjusting rod 801 extends inward (without blocking the upper opening of the through hole 703) so that the isolation ring 810 no longer blocks the upper end of the connecting pipe 702, and the liquid raw material will be sprayed into the feeding barrel, thereby removing a small amount of liquid raw material on the inner wall of the collecting chamber 510, making the collecting chamber 510 cleaner.

[0077] Specifically, Figure 6 , Figure 8-Figure 11 As shown, the power source of the second drive assembly 301 is an electromagnet, and a permanent magnet 610 is fixedly installed at the lower end of the piston assembly 601, and the permanent magnet 610 is an aluminum-nickel-cobalt magnet. When the volume of the collection chamber 510 is small, the equipment needs to be set up in multiples to absorb the liquid raw material, and when the volume is small, the piston assembly 601 is driven by the driving method of the electromagnet and the permanent magnet, which can achieve a faster response, and the magnetic force attenuation is also small under short strokes. The comprehensive effect is better than the mechanical type, and there is no need to set a complex transmission mechanism, and the volume occupancy is also small. However, due to the high temperature and high pressure environment in the collection chamber 510, the distribution of the magnetic field will be affected, resulting in the magnetic force attenuation or even failure of the permanent magnet, and the temperature in the feeding barrel is generally 230-320 degrees, and the melting point temperature of the PC material is 230-240 degrees. If the permanent magnet is ferrite or neodymium iron boron, a good driving effect cannot be achieved under this environment, so the permanent magnet is made of aluminum-nickel-cobalt material, and its attenuation failure temperature is 450-900 degrees, and the stability is better.

[0078] Specifically, Figure 7As shown, the power source of the second drive assembly 301 is a motor or a hydraulic assembly, and a drive rod 302 is installed on the second drive assembly 301. The upper end of the drive rod 302 is fixedly connected to the piston assembly 601, and the lower end of the drive rod 302 is received in the first drive assembly 201, or received in the first drive assembly 201 and the electrical appliance support 101, and the motor or hydraulic assembly drives the drive rod 302 to slide up and down. In the case where the volume of the collection chamber 510 is large (long stroke), pressure relief buffering can be performed by a small number of devices. At this time, the power source of the second drive assembly 301 is a motor or a hydraulic assembly, which can achieve a better driving effect, and the position adjustment of the piston assembly 601 is more accurate and stable, and the scene adaptability is also stronger, but the structure is relatively more complex and the rapid response capability is not strong. Therefore, the power source of the second drive assembly 301 needs to be selected according to the actual situation.

[0079] Specifically, Figure 8-Figure 11 As shown, the outer side surface of the connecting portion 720 is an arc surface or an inclined surface, and the liquid inlet hole 502 is provided with a first mating surface 503 that matches the outer side surface of the connecting portion 720; the upper end opening of the through hole 703 is provided with a second mating surface 704 that matches the outer surface of the ball head 910. The purpose is to make the sealing effect between the components better, and the inclined surface / arc surface relative to the right angle to the injection of liquid raw materials is also smaller. Since there is no corner with a small angle turn, the residual and attached liquid raw materials are also less. Furthermore, the edge of the matching groove 602 is provided with an inclined surface or an arc surface inclined toward the outside. When the piston assembly 601 is compressed / feeding, the inclined surface or arc surface inclined toward the outside can better gather the liquid raw material and accelerate the liquid raw material to enter the connecting pipeline 702.

[0080] It should be noted that when the piston assembly 601 is working, the compressed gas and liquid are buffered to a certain extent, and the vibration generated after the collision is damped by the external shock-absorbing support. Fig.12 As shown, the device body 10 is generally installed on the outer wall of the feed barrel 40 and several of them are arranged. The feed rod 30 in the feed barrel 40 is a telescopic feed rod with a spiral outer ring. The feed rod driving device 50 is generally a motor or a hydraulic device. The travel trigger switch 60 is generally fixedly mounted on the feed rod driving device 50 and connected to the feed rod 30. The device body 10 generally does not contact the injection pipeline 20 arranged relatively thereto. The device body 10 is separated from the heating device 41 and the hopper 42 on the feed barrel 40 by a certain distance.

[0081] It should be pointed out that Figure 8When the device is not in the open position and does not collect or discharge liquid, the piston assembly 601 can move forward a certain distance to increase the internal pressure of the collection chamber 510, so that the sealing display plate 710 is subjected to greater pressure. In conjunction with the spring 410, the ability of the movable part 701 to resist the internal pressure of the feed barrel can be increased, thereby adjusting the starting liquid inlet pressure of the device, so that there is no need to replace the spring to adjust the opening pressure of the movable part 701, but its liquid storage capacity will be reduced relatively. However, since the device is provided with multiple springs, the comprehensive liquid storage capacity can still be guaranteed. Fig. 9 Discharge liquid raw materials for the equipment; Fig.10 The liquid feeding action of the device may be that the liquid raw material in the feeding barrel presses the movable part 701 in, or the front end of the feeding rod contacts the ball head 910 to press the movable part 701 in; Fig.11 The device pressurizes the connecting pipeline 702, and then the movable rod 901 is extended outward in the next step. The remaining liquid is ejected after pressurization, and then the piston assembly 601 slowly moves back and resets. During the reset period, the collecting chamber 510 is connected with the feeding barrel to balance the internal and external pressure difference. Since the piston assembly 601 slowly resets, the collecting chamber 510 will not generate a strong suction force, thereby reducing the amount of liquid raw material sucked in again when balancing the pressure difference; further, the collecting chamber 510 can be connected to the outside through an air path to balance the pressure difference, such as: by replacing the sealing member 540 with the conveying member 550. When this embodiment is carried out, the collecting chamber 510 is not connected with the feeding barrel. Since it is not affected by the feeding barrel, this embodiment is more commonly used, but the cost will be higher and the fault tolerance will be lower.

[0082] And a corresponding control method, which includes:

[0083] S010, the controller of the device monitors whether the injection molding feeding rod is moving forward to inject material or moving backward to reset, and the controller is interconnected with the injection molding machine to realize monitoring;

[0084] S011, when moving forward to inject material, the first drive assembly 201 drives the adjustment rod 801 to move down and lock, and the second drive assembly 301 drives the piston assembly 601 to move down and lock. During this period, if the pressure in the feeding barrel reaches the trigger threshold, the movable part 701 is pressed in, thereby collecting the liquid raw material and reducing pressure for buffering;

[0085] S012, when the rearward movement is reset, the first driving component 201 drives the adjusting rod 801 to move upward, and then the second driving component 301 drives the piston component 601 to perform several forward and backward reciprocating movements. When the rearward movement is reset or after a preset time period, the first driving component 201 drives the adjusting rod 801 to move downward and lock, and the second driving component 301 drives the piston component 601 to move downward and lock to discharge liquid;

[0086] S020, when the injection molding is in progress, the heating part of the adjusting rod 801 heats the collecting chamber 510 to 250 to 320 degrees, so that the raw material remains liquid and avoids clogging, while creating a high temperature and high pressure environment;

[0087] S030, collecting chamber pressure adjustment, the first driving assembly 201 drives the adjusting rod 801 to move down and lock, the second driving assembly 301 drives the piston assembly 601 to move forward a preset distance and locks the piston assembly 601 after completion, so as to adjust the pressure of opening the movable member 701;

[0088] S040, collection chamber cleaning. When the collection chamber 510 needs to be cleaned, the blocking member 540 is removed and the sealing member 530 installed in the connecting hole 521 is observed to see if there is any problem. If there is any problem, it is replaced. Otherwise, the conveying member 550 is installed in the connecting hole 521. Then, the collection chamber 510 is connected to the external cleaning equipment through the conveying member 550 and cleaned. After the cleaning is completed, the conveying member 550 is removed and the blocking member 540 is reset.

[0089] In summary, the present invention connects the above-mentioned sub-controller, stroke trigger switch, electrical support, first drive assembly, second drive assembly, support member, collection barrel, piston assembly and other components together through an ingenious structure, and sets a blocking member and a conveying member on the collection barrel, and cooperates with corresponding adjustment and control methods to achieve that during injection molding feeding, the internal pressure of the feeding barrel is too large / unstable, and the movable parts of several pressure relief reflux devices are opened under the pressure difference, and the liquid raw material enters the collection chamber to reduce the internal pressure of the feeding barrel, thereby increasing the time for the staff to adjust the hydraulic circuit of the feeding rod and improving the fault tolerance redundancy;

[0090] The reset state of the feeding rod is detected by the stroke trigger switch, and then the secondary controller receives the output data of the injection molding equipment, obtains the position information of the feeding rod, and determines the timing of the pressure relief device to discharge liquid, such as: the feeding rod is reset and stopped (the device performs the discharge action), and the discharge action is stopped when the feeding rod moves forward, so as to discharge the raw material liquid entering the pressure relief tube in time;

[0091] After the injection molding and feeding are completed, when the feeding rod moves backward and resets, the second driving assembly drives the movable rod to move forward to open the through hole and the first driving assembly drives the piston assembly to reciprocate, and then cooperates with the feeding rod to move backward to reduce the internal pressure of the feeding barrel, so that the liquid raw material collected in the collection chamber is sprayed into the feeding barrel. In this process, the heating part on the adjusting rod is used to keep the liquid raw material warm to avoid condensation and blockage; by adjusting the distance between the piston assembly and the movable part, the internal pressure of the collection chamber is adjusted. Under the action of a larger internal pressure and a spring, the movable part can be made more difficult to be opened, so that the equipment can adapt to a larger feeding barrel pressure and will not be opened prematurely, thereby ensuring stability and improving the application scale;

[0092] The plugging member and the sealing member ensure that the collection chamber does not leak during operation. At the same time, the mating end surface on the plugging member can reduce the gap between the piston assembly and the connecting hole, ensuring that the piston assembly and the collection chamber are tightly connected, thereby reducing the risk of wear and leakage inside the piston assembly when passing through the connecting hole; the conveying member can be a one-way valve or a connecting one-way valve, and can be conveniently connected to an external high-pressure liquid / gas cleaning device through the conveying member to clean the collection chamber. The above greatly improves the practical value of the present invention.

[0093] The above-described embodiments only express one or more implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A self-checking pressure relief device for injection molding feeding equipment, characterized in that: include: A secondary controller, the secondary controller being electrically connected to the injection molding device; A stroke trigger switch, wherein the stroke trigger switch is fixedly mounted on the injection molding equipment, the stroke trigger switch is connected to the feeding rod of the injection molding equipment, and the stroke trigger switch is electrically connected to the secondary controller; An electrical appliance support, the electrical appliance support is used to install electronic equipment, and the electrical appliance support is fixedly connected to a feeding barrel of an injection molding device; A first drive assembly, which is fixedly mounted on the electrical support, wherein the power source of the first drive assembly is any one or more of a motor, a solenoid valve, and a hydraulic assembly, and the first drive assembly is used to slide the locking member and the driving member up and down; A second drive assembly, wherein the second drive assembly is fixedly mounted on the first drive assembly, a connecting ring is fixedly connected to the outer side of the second drive assembly, a power source of the second drive assembly is any one or more of an electromagnet, a motor, and a hydraulic assembly, and the second drive assembly is used to lock the member or drive the member to slide up and down; A support member, the support member is installed in the second driving assembly, the support member is provided with a mounting groove, and a spring is provided in the mounting groove; A collecting cylinder, wherein the upper end surface of the collecting cylinder is provided with a liquid inlet hole, and a collecting chamber is provided on the collecting cylinder, the opening of the collecting chamber faces downward and is connected to the liquid inlet hole, the collecting cylinder is fixedly connected to the second driving assembly and the connecting ring, and the connecting ring seals the opening of the collecting chamber; A connecting platform is provided on the outer surface of the collecting cylinder, a connecting hole communicating with the collecting chamber is provided on the connecting platform, a sealing member is installed in the connecting hole, a blocking member or a conveying member is installed in the connecting hole, the conveying member is provided with a conveying hole, the blocking member cooperates with the sealing member to seal the connecting hole, and the conveying member is used to connect with the outside world; The blocking member is provided with a detection hole, and the inner end opening of the detection hole is connected to the sealing member; A piston assembly, wherein the piston assembly is installed in the collecting chamber, the periphery of the piston assembly is tightly connected to the inner wall of the collecting chamber, the second driving assembly drives the piston assembly to reciprocate, and the upper end surface of the piston assembly is provided with a matching groove; A movable part, wherein the movable part is provided with a through hole penetrating the upper and lower ends thereof, the upper end of the movable part is a connecting part, the shape of the connecting part matches the liquid inlet hole, a sealing display plate extending outward is provided at the lower side of the connecting part, the shape of the sealing display plate matches the matching groove, the connecting part is provided with a connecting pipe, the upper end pipe mouth of the connecting pipe is connected to the through hole, the lower end pipe mouth of the connecting pipe is connected to the lower side surface of the sealing display plate or is arranged at the lower side of the sealing display plate, the movable part is arranged in the collecting chamber, the piston assembly is sleeved on the movable part, the piston assembly is tightly connected to the movable part, and the lower end of the movable part abuts against the spring; An adjusting rod, wherein the adjusting rod is provided with a heating portion, the position of the heating portion corresponds to the position of the collecting chamber, the adjusting rod is installed in the through hole, the adjusting rod passes through the supporting member and is connected to the first driving assembly and the electrical appliance support, and the first driving assembly locks or drives the adjusting rod to slide up and down; A movable rod, the movable rod is fixedly mounted on the upper end of the adjusting rod, a ball head is provided at the upper end of the movable rod, the ball head is used to seal the upper end opening of the through hole, the ball head can extend to the outside of the liquid inlet hole, the rod body diameter of the movable rod is smaller than the diameter of the through hole, and a flow gap is provided between the rod body of the movable rod and the through hole; The first drive assembly, the second drive assembly, and the electronic equipment in the electrical appliance support are electrically connected to the secondary controller.

2. The self-checking pressure relief device of the injection molding feeding equipment according to claim 1 is characterized in that: A first step and a second step are sequentially arranged in the connecting hole, the sealing member is installed on the first step, the blocking member or the conveying member is installed on the second step, the blocking member is tightly connected to the sealing member, and the conveying member is tightly connected to the sealing member.

3. A self-checking pressure relief device for injection molding feeding equipment according to claim 1 or 2, characterized in that: The sealing member is annular, and the end surface of the blocking member facing inward is a matching end surface, and the curvature of the matching end surface is consistent with the curvature of the side wall of the collecting chamber.

4. The self-checking pressure relief device of the injection molding feeding equipment according to claim 1 is characterized in that: The upper end opening of the through hole is provided with a second matching surface matching with the outer surface of the ball head.

5. The self-checking pressure relief device of the injection molding feeding equipment according to claim 1 is characterized in that: Also includes: An isolation ring is sleeved on the lower end of the movable rod and is tightly connected to the side wall of the through hole.

6. The self-checking pressure relief device of the injection molding feeding equipment according to claim 1, characterized in that: The power source of the second driving component is an electromagnet, and a permanent magnet is fixedly mounted on the lower end of the piston component, and the permanent magnet is an aluminum nickel cobalt magnet.

7. The self-checking pressure relief device of the injection molding feeding equipment according to claim 1 is characterized in that: The power source of the second driving component is a motor or a hydraulic component. A driving rod is installed on the second driving component. The upper end of the driving rod is fixedly connected to the piston component. The lower end of the driving rod is received in the first driving component, or received in the first driving component and the electrical appliance support. The motor or hydraulic component drives the driving rod to slide up and down.

8. The self-checking pressure relief device of injection molding feeding equipment according to claim 1, characterized in that: The outer side surface of the connecting portion is a curved surface or an inclined surface, and the liquid inlet hole is provided with a first matching surface that matches with the outer side surface of the connecting portion.

9. The self-checking pressure relief device of injection molding feeding equipment according to claim 1, characterized in that: The edge of the matching groove is provided with an inclined surface or a curved surface inclined toward the outside.

10. The self-checking pressure relief device of injection molding feeding equipment according to claim 1, characterized in that: The connecting platform and the connecting hole are at least provided with two, and a one-way valve is provided in the conveying member.

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