Precision Injection System

Abstract

The present invention discloses a precision injection system for injection molding of one or more liquid materials. The precision injection system includes: a mixer having a cavity for accommodating the liquid materials and mixing the liquid materials in the cavity; at least one mold for receiving the mixed liquid materials and performing injection molding thereon; a detector disposed between the mixer and the mold, having a metering space for accommodating the liquid materials and detecting the flow rate of the liquid materials flowing through the metering space; and a controller communicatively connected to the detector, receiving signals from the detector and controlling the flow of the liquid materials according to the signals. The precision injection system provided by the technical solution of the present invention can solve the technical problem of material waste caused by large detection errors resulting in material overflowing from the mold.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber processing equipment, and particularly to a precision injection system. Background Art

[0002] The forming principle of traditional power liquid silicone rubber: Usually, a silicone injection machine is used to inject the rubber in the A and B rubber storage cylinders into a static mixer respectively. After the A and B groups of rubber are evenly mixed, they flow into a forming mold, and then the operator closes the mold feeding valve manually. The injection machine judges whether the injection volume reaches the set value by detecting the rubber level in the storage cylinder. Since the rubber needs to pass through a static mixer during the transmission process, the rubber in the pipeline between the static mixer and the storage cylinder is in a high-pressure state during transmission, and the rubber in the pipeline between the static mixer and the mold is in a low-pressure state during transmission. As a result, there is a large difference between the amount of rubber detected in the storage cylinder and the actual amount of rubber injected into the mold, causing the rubber to overflow from the mold and wasting raw materials. Summary of the Invention

[0003] The main object of the present invention is to provide a precision injection system, aiming to solve the technical problem that there is a large error between the detected amount and the actual amount of rubber injected into the mold due to different pressures in the two sections of the material transmission pipeline before and after the mixer.

[0004] To achieve the above object, the present invention provides a precision injection system for injection molding of one or more liquid materials. The precision injection system includes:

[0005] A mixer, which is provided with a cavity for accommodating the liquid material and mixes the liquid material in the cavity;

[0006] At least one mold, which is used to receive the mixed liquid material and perform injection molding on it;

[0007] A detector, which is arranged between the mixer and the mold, is provided with a quantitative space for accommodating the liquid material, and detects the flow rate of the liquid material flowing through the quantitative space;

[0008] A controller, which is communicatively connected with the detector, receives the signal from the detector and controls the flow of the liquid material according to the signal.

[0009] Optionally, a pneumatic valve is further arranged between the mixer and the detector, and the pneumatic valve is communicatively connected with the controller; and / or,

[0010] The mixer is further connected to an injection machine, which is used to provide the driving force for the flow of the liquid material, and the injection machine is communicatively connected with the controller.

[0011] Optionally, a conveying cavity is provided inside the detector, and two meshing gears are provided inside the conveying cavity. The gap between two teeth of the gear forms the metering space.

[0012] Optionally, the detector is further provided with a magnetic sensor. Magnets are provided on each tooth of one of the gears. The magnets are inductively connected to the magnetic sensor. Each time the gear rotates one tooth position, the magnetic sensor generates a signal. The magnetic sensor is communicatively connected to the controller.

[0013] Optionally, the detector includes a base and an upper cover that are hermetically connected. The gear is rotatably connected to the base. The conveying cavity is opened on the side of the upper cover opposite to the base. An inlet and an outlet that communicate with the conveying cavity are further opened on the base. The magnetic sensor is provided on the upper cover.

[0014] Optionally, a feed channel communicates between the inlet and the conveying cavity, and a discharge channel communicates between the outlet and the conveying cavity; both the feed channel and the discharge channel include a transverse channel and a vertical channel that communicate with each other. The vertical channel is close to the conveying cavity and communicates with the conveying cavity; the vertical channels of the feed channel and the discharge channel are respectively located on both sides of the axis connection line of the two gears.

[0015] Optionally, the axes of the two gears are arranged in parallel, and / or the magnets are in the same direction as the extending direction of the gear axes.

[0016] Optionally, the edges of the teeth of the gear and both end faces of the gear are in contact with the inner wall of the conveying cavity.

[0017] Optionally, a dispenser is further provided between the detector and the mold. The dispenser is provided with at least one delivery pipe, and each delivery pipe is connected to the corresponding mold.

[0018] Optionally, the mold is connected with a feed gun, and the feed gun is connected with a pneumatic gun closing valve. The pneumatic gun closing valve is communicatively connected to the controller.

[0019] In the technical solution of the present invention, by adopting a mixer to fully mix the liquid material, it is beneficial to the molding of the liquid material in the mold. The detector is arranged between the mixer and the mold, so that the detector and the mold are in the same pressure transmission pipeline, avoiding the difference between the actual injection amount and the detection amount caused by the pressure difference between the detector and the mold, resulting in the overflow of the liquid material from the mold. Specifically, the detector has a metering space for accommodating and conveying the liquid material, and conveys the liquid material to the mold quantitatively, thereby detecting the amount of the liquid material used for molding entering the mold. The controller is communicatively connected to the detector, receives the signal of the detector in time, and controls the flow of the liquid material. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the precision injection system of the present invention;

[0022] Figure 2 It is an exploded view of the detector of the embodiment of the precision injection system of the present invention;

[0023] Figure 3 It is an exploded view of the detector of the embodiment of the precision injection system of the present invention;

[0024] Figure 4 It is a schematic structural diagram of a part of the detector of the embodiment of the precision injection system of the present invention.

[0025] Explanation of the reference numerals in the drawings:

[0026] Label Name Label Name 1 Mixer 35 Upper cover 11 Cavity 36 Base 2 Mold 361 Feeding port 21 Feeding gun 362 Discharge port 3 Detector 363 Feeding channel 31 Delivery cavity 364 Discharge channel 32 Gear 4 Pneumatic valve 33 Magnetic sensor 5 Injection machine 34 Magnet 6 Distributor

[0027] The realization of the object, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention provides a precision injection system.

[0033] In the prior art, since the rubber material needs to pass through a static mixer during the transmission process, the rubber material in the pipeline between the static mixer and the rubber storage cylinder is under high pressure during transmission, and the rubber material in the pipeline between the static mixer and the mold is under low pressure during transmission, resulting in a large difference between the measured rubber amount in the rubber storage cylinder and the actual rubber amount injected into the mold, causing the rubber material to overflow from the mold and wasting raw materials.

[0034] To solve the above technical problems, the technical solution of the present invention fully mixes the liquid materials by arranging a mixer, which is beneficial to the molding of the liquid materials in the mold. A detector is arranged between the mixer and the mold, so that the detector and the mold are in the same pressure transmission pipeline, avoiding the difference between the actual injection amount and the detected amount caused by the pressure difference between the detector and the mold, resulting in the liquid materials overflowing from the mold. Specifically, the detector has a quantitative space for accommodating and transporting the liquid materials, and quantitatively transports the liquid materials to the mold, thereby detecting the amount of liquid materials used for molding entering the mold. The controller is communicatively connected to the detector, timely receives the signal of the detector, and controls the flow of the liquid materials.

[0035] The above technical solutions will be described in detail below with reference to the accompanying drawings.

[0036] In an embodiment of the present invention, as Figure 1-4 shown, the precision injection system is used for injection molding of one or more liquid materials. The precision injection system includes:

[0037] A mixer 1, which is provided with a cavity 11 for accommodating the liquid material and mixes the liquid material in the cavity 11;

[0038] At least one mold 2, which is used to receive the mixed liquid material and carry out injection molding on it;

[0039] A detector 3, which is arranged between the mixer 1 and the mold 2, is provided with a metering space for accommodating the liquid material, and detects the flow rate of the liquid material flowing through the metering space;

[0040] A controller, which is communicatively connected to the detector 3, receives the signal of the detector 3 and controls the flow of the liquid material according to the signal.

[0041] In this embodiment, the liquid material is described by taking the electrically conductive liquid silicone rubber as an example, but it is not limited to only this type of liquid material. The liquid silicone rubber is fully and evenly mixed in the cavity 11 of the mixer 1. Specifically, the mixer 1 is a static mixer or other mixer, which is not limited in this embodiment. Among them, the static mixer is a highly efficient mixing device without moving parts, which changes the flow state of the fluid in the pipe by using the mixing unit fixed in the pipe to achieve good dispersion and full mixing between different fluids. It can be understood that the mixer 1 and the detector 3, and the detector 3 and the mold 2 are connected through a conveying pipeline, and the liquid silicone rubber is conveyed through the conveying pipeline. The mold 2 is provided with a space of a specific shape, and the liquid silicone rubber is formed in the space of the mold 2.

[0042] The feeding end of the detector 3 is communicated with the discharging end of the mixer 1, the discharging end of the detector 3 is communicated with the feeding end of the mold 2, and the liquid silicone rubber in the metering space of the detector 3 enters the mold 2 and generates a signal, so as to detect the amount of the material entering the mold 2. Specifically, first, according to the size of the molding space of the mold 2 and the number of the mold 2, calculate the amount of the material required for one-time molding, set a suitable value in the system, convey the liquid material in the metering space of the detector 3 to the mold 2, generate a signal each time the liquid material flows through once, and transmit the signal to the controller until the predetermined value. The controller controls the stop of the material conveying through the set control program and control system, such as controlling the opening and closing of the valve on the conveying pipeline, or controlling the opening and closing of the mold inlet, etc. to control the flow of the liquid material. In this embodiment, the volume of the metering space of the detector 3 is small, and the amount of the material required for the molding of the mold 2 is several times the one-time conveying amount of the metering space of the detector 3. Of course, it can be understood that in the actual production process, a detector 3 corresponding to a suitable metering space can be selected according to the amount required by the mold 2 to avoid waste of materials.

[0043] Optionally, a pneumatic valve 4 is further provided between the mixer 1 and the detector 3, and the pneumatic valve 4 is communicatively connected to the controller; and / or,

[0044] The mixer 1 is further communicated with an injection machine 5. The injection machine 5 is used to provide the power for the flow of the liquid material, and the injection machine 5 is communicatively connected to the controller.

[0045] In the specific implementation process, the pneumatic valve 4 can be a high-pressure resistant pneumatic valve to control the on-off of the control system. And after the feeding amount of the mold 2 reaches the set value, there is still a certain driving force for the material upstream of the detector 3 to enter the detector 3, which has a certain impact on the detection. Closing the pneumatic valve 4 close to the detector 3 in time can quickly stop the liquid material from flowing in the mixer 1, making the detection more accurate. In addition, the pneumatic valve 4 is arranged before the detector 3, which can protect the detector 3 and avoid the situation of pressure shock. In another embodiment, the mixer 1 is communicated with the injection machine 5. The injection machine 5 can be a conveying pump or a piston power mechanism and other mechanisms that provide conveying power. The liquid material flows in the system by the power provided by the injection machine 5. In addition, the injection machine 5 is further connected with a material cylinder for containing the liquid material, and the liquid material is conveyed from the material cylinder to the system. Specifically, taking the mixing of two materials A and B as an example, the two materials A and B are stored in the corresponding material cylinders respectively. Each material cylinder of each liquid material is respectively connected with a corresponding injection machine 5 and is respectively connected with a corresponding conveying branch pipe. Each conveying branch pipe is respectively connected with the mixer 1. The two materials A and B are fully mixed in the mixer 1. And in order to avoid the backflow of the liquid material, each conveying branch pipe is provided with a one-way valve.

[0046] Optionally, a conveying cavity 31 is provided in the detector 3, and two meshing gears 32 are provided in the conveying cavity 31. The gap between the two teeth of the gear 32 forms a quantitative space.

[0047] In the specific implementation process, the two gears 32 are meshingly connected. Optionally, the axes of the two gears 32 are parallelly arranged. The fixed gap between the two teeth of the gear 32, that is, the gear groove, forms a quantitative space for accommodating and conveying the liquid material. And the edge of the tooth of the gear 32 contacts the inner wall of the conveying cavity 31, and the two end faces of the gear 32 contact the inner wall to ensure the sealing performance, and further ensure the accuracy of the conveying amount. Specifically, after the liquid material flows into the conveying cavity 31, it fills the quantitative space, and then pushes the gear 32 to rotate, thereby conveying the liquid material. Since the gap between the two gears 32 is fixed and unchanged, in this way, the liquid material conveyed by each rotation of the gear 32 is fixed, thereby realizing the control of the material conveying amount, and its detection accuracy control reaches 0.1G.

[0048] Further, the detector 3 is further provided with a magnetic sensor 33. A magnet 34 is provided on each tooth of a gear 32. The magnet 34 is inductively connected to the magnetic sensor 33. Each time the gear 32 rotates one tooth position, the magnetic sensor 33 generates a signal, corresponding to a certain amount of liquid material flowing into the mold 2. The magnetic sensor 33 is communicatively connected to the controller.

[0049] Two gears 32 mesh with each other and rotate simultaneously. Installation grooves are formed on each tooth of one of the gears 32, and the magnet 34 is fixed in the installation groove. The magnet 34 is in a cylindrical structure, and the extending direction of its axis is the same as that of the axis of the gear 32. Each time the gear 32 rotates one tooth position, the magnetic sensor 33 generates an induction signal and transmits the signal to the controller. After reaching the set value, the controller controls to stop the conveying of the liquid material.

[0050] Still further, the detector 3 includes a base 36 and an upper cover 35 which are hermetically connected. The gear 32 is rotatably connected to the base 36. The conveying cavity 31 is formed on the opposite side of the upper cover 35 and the base 36. The base 36 is further provided with a feed inlet 361 and a discharge outlet 362 which communicate with the conveying cavity 31. The magnetic sensor 33 is arranged on the upper cover 35.

[0051] Specifically, the edge end faces of the upper cover 35 and the base 36 are fixed by a plurality of bolts to ensure a sealed connection between the two. The two gears 32 are connected to the base 36. The feed inlet 361 and the discharge outlet 362 are respectively located on both sides of the center line connection of the two gears 32. The magnetic sensor 33 is arranged on the upper cover 35 and is close to the gear 32 provided with the magnet 34.

[0052] Further, a feed channel 363 is connected between the feed inlet 361 and the conveying chamber 31, and a discharge channel 364 is connected between the discharge outlet 362 and the conveying chamber 31. In this embodiment, the feed inlet 361 and the discharge outlet 362 are provided on the side wall of the base 36. Both the feed channel 363 and the discharge channel 364 include a horizontal channel and a vertical channel that are connected to each other. The vertical channel is in the same direction as the axis of the gear 32, is close to the conveying chamber 31 and communicates with the conveying chamber 31. The vertical channels are respectively located on both sides of the center line connecting the two gears 32. The feeding direction is perpendicular to the rotation direction of the gear 32, avoiding impacting the rotation of the gear 32 and causing detection errors. In the specific implementation process, the liquid material sequentially passes through the feed inlet 361, the feed channel 363, the metering space, the discharge channel 364, and the discharge outlet 362, and enters the mold 2 through the conveying pipeline. The liquid material enters the metering space of the conveying chamber 31 through the vertical channel of the feed channel, with a short conveying path and high efficiency. The feed channel 363 and the discharge channel 364 are respectively located on both sides of the center line connecting the two gears 32. The side of the conveying chamber 31 connected to the feed channel 363 is the feed side, and the side of the conveying chamber 31 connected to the discharge channel 364 is the discharge side. The liquid material continuously enters the feed side and drives the gear 32 to rotate, realizing the conveying of the material.

[0053] Optionally, a distributor 6 is further provided between the detector 3 and the mold 2. The distributor 6 is provided with at least one conveying pipe, and each conveying pipe is connected to the corresponding mold 2.

[0054] In another embodiment, there are multiple molds 2. In order to convey liquid material to multiple molds 2, a distributor 6 is provided between the detector 3 and the molds 2, and the conveying pipes are connected accordingly. Each conveying pipe conveys liquid material to the corresponding mold 2. Of course, it can be understood that the numerical value of the required material set in the system is the material required for the corresponding mold 2. And after one mold 2 completes injection molding, the injection molding of the next mold 2 is carried out, realizing that one injection machine 5 can correspond to the material injection of multiple molds 2, without the need to replace the mold 2, saving the process.

[0055] Optionally, the mold 2 is connected with a feed gun 21. The feed gun 21 is connected with a pneumatic gun closing valve, and the pneumatic gun closing valve is communicatively connected with the controller. Specifically, the material enters the mold 2 through the feed gun 21. The pneumatic gun closing valve is connected to the controller. After the controller receives the signal to stop feeding, it controls the pneumatic gun closing valve to close, stopping the conveyance of the material into the mold 2, ensuring that the material will not overflow from the mold 2 and saving the material.

[0056] Therefore, in the precision injection system provided by this embodiment, the detector 3 and the mold 2 are in the same low-pressure pipeline, with high detection accuracy. Moreover, after the detector 3 reaches the set value, it sends a signal to the controller. After the controller receives the signal to stop feeding, it simultaneously controls the injection machine 5 to stop, closes the pneumatic valve 4, and closes the corresponding pneumatic gun-closing valve. After the mold 2 is filled with materials, it enters the vulcanization and thermosetting molding process. It can be understood that after the controller receives the start signal, it controls the injection machine 5 to start, opens the pneumatic valve 4 and the pneumatic gun-closing valve on the corresponding mold 2, and performs material injection, detection, and control. By placing the detector 3 and the mold 2 in the same low-pressure pipeline and keeping the spatial dimension of the gear 32 of the detector 3 fixed, the discharge detection accuracy can be controlled to 0.1 G, solving the problem of discharge detection differences caused by traditional injection technologies. The whole process is automatically controlled, and multiple molds 2 can be controlled for injection molding without manually closing the material feeding of the mold 2.

[0057] The above are only the optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A precision injection system for injection molding of one or more liquid materials, characterized in that, the precision injection system comprises: a mixer, provided with a cavity for accommodating the liquid material and mixing the liquid material in the cavity; at least one mold for receiving the mixed liquid material and performing injection molding thereon; a detector disposed between the mixer and the mold, provided with a quantitative space for accommodating the liquid material and detecting the flow rate of the liquid material flowing through the quantitative space; a controller communicatively connected to the detector, receiving the signal from the detector and controlling the flow of the liquid material according to the signal; a conveying cavity is provided in the detector, and two meshing gears are provided in the conveying cavity, and the gap between two teeth of the gears forms the quantitative space; the detector is further provided with a magnetic sensor, magnets are provided on each tooth of one of the gears, the magnets are inductively connected to the magnetic sensor, and each time the gear rotates one tooth position, the magnetic sensor generates a signal, and the magnetic sensor is communicatively connected to the controller; a pneumatic valve is further provided between the mixer and the detector, and the pneumatic valve is communicatively connected to the controller; and / or, the mixer is further connected to an injection machine for providing power for the flow of the liquid material, and the injection machine is communicatively connected to the controller.

2. The precision injection system according to claim 1, characterized in that, the detector comprises a base and an upper cover which are hermetically connected, the gear is rotatably connected to the base, the conveying cavity is opened on the surface of the upper cover opposite to the base, and a feed inlet and a discharge outlet communicating with the conveying cavity are further opened on the base, and the magnetic sensor is disposed on the upper cover.

3. The precision injection system according to claim 2, characterized in that, a feed channel is communicated between the feed inlet and the conveying cavity, and a discharge channel is communicated between the discharge outlet and the conveying cavity; both the feed channel and the discharge channel comprise a transverse channel and a vertical channel which are communicated with each other, the vertical channel is close to the conveying cavity and communicated with the conveying cavity; the vertical channels of the feed channel and the discharge channel are respectively located on both sides of the axis connection line of the two gears.

4. The precision injection system according to claim 1, characterized in that, the axes of the two gears are arranged in parallel, and / or, the magnets are in the same direction as the extending direction of the gear axes.

5. The precision injection system according to claim 1, characterized in that, the edges of the teeth of the gear and both end faces of the gear are in contact with the inner wall of the conveying cavity.

6. The precision injection system according to claim 1, characterized in that, a distributor is further provided between the detector and the mold, the distributor is provided with at least one delivery pipe, and each delivery pipe is connected to the corresponding mold.

7. The precision injection system according to claim 1, characterized in that, the mold is connected with a feed gun, the feed gun is connected with a pneumatic gun closing valve, and the pneumatic gun closing valve is communicatively connected to the controller.

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