Variable-speed melt pressure measuring device

Abstract

The utility model relates to the technical field of injection molding, in particular to a variable-speed melt pressure measuring device which comprises an extrusion module, a transition module, a configuration module, a first pressure sensor, a second pressure sensor and a third pressure sensor. The transition module is fixedly arranged at the communication position of the extrusion module and the configuration module, the first pressure sensor is arranged in the extrusion module, the second pressure sensor is arranged on the transition module, and the third pressure sensor is arranged on the configuration module. According to the utility model, through the first pressure sensor, the second pressure sensor and the third pressure sensor, the whole-process pressure monitoring of the variable-speed melt in the extruder is realized, and the internal structure of the extruder can be improved by researchers according to the pressure change condition of the melt.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, and more particularly to a variable speed melt pressure measuring device. Background Art

[0002] The extruder is an important piece of equipment in injection molding production and has a wide application market in my country. The runner, screw, outlet die, and mouth die in the extruder head are the main structures through which the material flows in the extruder. During the extrusion process, the rubber compound is usually extruded from the outlet of the extruder head and then enters the configuration module. When the melt flows through the flow channel at the connection, the velocity, pressure, and shear stress of the melt will suddenly change due to different positions. The change in melt pressure will have a significant impact on the surface properties or other properties of the extruded material. At the same time, due to the complexity of the polymer melt, its pressure in the area of ​​velocity change changes nonlinearly, so the collection of pressure data is of great significance.

[0003] Currently, the extrusion platform is directly connected to different configuration modules. When the melt enters the configuration module from the extrusion platform, sudden changes in diameter can cause sudden changes in pressure, velocity, and shear stress. Irrational connection design between the extruder die and the configuration module can prevent the fluid's rheological properties from changing as expected within the flow channel. This can also create dead spots and hinder smooth flow, impacting product quality.

[0004] A Chinese patent discloses a screw extruder comprising: a screw; and a housing that houses the screw, with a material inlet positioned upstream in the direction of extrusion of the mixture and a front opening positioned downstream in the direction of extrusion of the mixture. A pressure sensor is positioned between the downstream end of the inlet and the front opening of the housing. This pressure sensor measures the pressure inside the housing, and the screw speed is controlled based on the pressure measured by the pressure sensor. However, this extruder's pressure sensor is designed to measure the internal pressure of the housing and cannot monitor the pressure of the melt under variable speed conditions, nor can it provide guidance for the design of module connections based on the pressure conditions of the variable speed melt. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiency of the prior art that it cannot measure the pressure change process of the variable speed melt, and to provide a variable speed melt pressure measuring device that can perform comprehensive pressure monitoring on the variable speed melt.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A variable-speed melt pressure measuring device is provided, comprising an extrusion module, a transition module, a configuration module, a first pressure sensor, a second pressure sensor and a third pressure sensor. The extrusion module is connected to the configuration module, the transition module is fixedly installed at the connection point between the extrusion module and the configuration module, the first pressure sensor is installed in the extrusion module, the second pressure sensor is installed in the transition module, and the third pressure sensor is installed in the configuration module.

[0008] Through this setting, when it is necessary to measure whether the connection design between the configuration module and the extruder is reasonable, the configuration module is connected to the extrusion module, and the transition module is located at the connection between the configuration module and the extrusion module. The melt flows from the extrusion module through the transition module and reaches the configuration module. The first pressure sensor measures the extrusion pressure of the melt in the extrusion module, the second pressure sensor measures the speed change pressure of the melt at the transition module, and the third pressure sensor measures the configuration pressure of the melt in the configuration module, thereby obtaining the pressure of the melt before, during and after the speed change, forming a complete pressure diagram, which helps researchers judge the connection condition of the extruder through the pressure diagram, thereby providing help for improving the extruder connection structure.

[0009] Preferably, the extrusion module includes an extrusion screw and an extrusion pipe, the extrusion screw is arranged in the extrusion pipe, and the extrusion screw and the extrusion pipe are coaxially arranged, the first pressure sensor is passed through the extrusion pipe, and the extrusion pipe is connected to the configuration module.

[0010] With this arrangement, the rotation of the extrusion screw pushes the melt forward along the extrusion pipe, and the first pressure sensor measures the melt pressure in the extrusion pipe before the speed change.

[0011] Preferably, the first pressure sensor, the second pressure sensor and the third pressure sensor are all slightly soluble pressure sensors.

[0012] The operating principle of the micro-solution pressure sensor is based on the piezoresistive effect. When external pressure acts on the sensor surface, the glass micro-solution inside the sensor undergoes a slight deformation, causing the internal resistance of the micro-solution to change. By measuring this resistance change, the external pressure value can be indirectly obtained. This setup can accurately measure the pressure of the melt in the extruder.

[0013] Preferably, it also includes three groups of adjustment mechanisms, the first pressure sensor is movably connected to the extrusion module through a group of the adjustment mechanisms, the second pressure sensor is movably connected to the transition module through a group of the adjustment mechanisms, and the third pressure sensor is movably connected to the configuration module through a group of the adjustment mechanisms.

[0014] Through this setting method, the extension length of the first pressure sensor, the second pressure sensor or the third pressure sensor can be adjusted respectively through the adjustment mechanism. When the melt thickness is thicker, the first pressure sensor, the second pressure sensor and the third pressure sensor can be appropriately adjusted to extend. When the melt thickness is thinner, the first pressure sensor, the second pressure sensor and the third pressure sensor can be appropriately adjusted to retract. This allows the first pressure sensor, the second pressure sensor and the third pressure sensor to accurately measure the melt pressure when facing melts of different thicknesses, which is beneficial to improving the accuracy of pressure measurement.

[0015] Preferably, the adjustment mechanism includes a mounting block, an adjusting bolt, an adjusting plate and an elastic member. The three mounting blocks are fixedly embedded in the extrusion module, the transition module and the configuration module respectively. The mounting block is also provided with an adjustment through-hole. The adjusting plate is slidably installed in the adjustment through-hole. The adjusting plate is also elastically connected to the mounting block through an elastic member. The adjusting bolt is threadedly connected to the mounting block, and the end of the adjusting bolt abuts against one side of the adjusting plate. The first pressure sensor, the second pressure sensor and the third pressure sensor are respectively fixedly connected to the other side of the adjustment plates of the three groups of adjustment mechanisms.

[0016] With this setting, when it is necessary to adjust the extension length of the first pressure sensor, the second pressure sensor or the third pressure sensor, the depth of the adjusting bolt inserted into the mounting block is changed by rotating the adjusting bolt, and one side of the adjusting plate abuts against the adjusting bolt. At the same time, the adjusting plate is subjected to the elastic force of the elastic member toward the adjusting bolt, ensuring that the adjusting plate and the adjusting bolt are tightly abutted. The adjusting plate can change its position in the mounting block as the insertion depth of the adjusting bolt changes, thereby driving the first pressure sensor, the second pressure sensor or the third pressure sensor to move, thereby controlling the extension length of the first pressure sensor, the second pressure sensor and the third pressure sensor.

[0017] Preferably, the end of the extrusion pipe is further provided with a mounting groove, and the transition module is snap-connected in the mounting groove.

[0018] With this setting, the transition module is inserted into the extrusion pipe, which is convenient for connection and ensures that the transition module is tightly connected to the extrusion pipe, thus avoiding gaps caused by looseness during the measurement process and affecting the melt pressure value.

[0019] Preferably, the transition module is a ramp structure, the ramp on the transition module is arranged toward the inside of the extrusion pipe, and the second pressure sensor is arranged through the transition module.

[0020] Through this setting, when the melt flows from the extrusion module to the configuration module, the melt flows along the inclined surface of the transition module, which is conducive to making the transition of the melt speed change process smooth, reducing the probability of dead zones in the melt, and facilitating the second pressure sensor to measure the actual pressure in the speed-changing melt flow.

[0021] Preferably, the transition module is an arc-loop structure, the arc surface on the transition module is arranged toward the inside of the extrusion pipe, and the second pressure sensor is arranged through the transition module.

[0022] Through this setting, when the melt flows from the extrusion module to the configuration module, the melt flows along the curved surface of the transition module, which is conducive to making the transition of the melt speed change process smooth, reducing the probability of dead zones in the melt, and facilitating the second pressure sensor to measure the actual pressure in the speed-changing melt flow.

[0023] Preferably, it further includes a transmission module and a host computer, the first pressure sensor, the second pressure sensor and the third pressure sensor are all communicatively connected to the transmission module, and the transmission module is communicatively connected to the host computer.

[0024] Through this setting, the data collected by the first pressure sensor, the second pressure sensor and the third pressure sensor can be integrated and recorded by the host computer, which is convenient for researchers to study the melt speed change.

[0025] Preferably, it also includes a sealing flange, the end of the extrusion pipe is provided with a first boss, the end of the configuration module is provided with a second boss, the first boss and the second boss are combined to form a connecting boss, and the sealing flange is installed on the outside of the connecting boss.

[0026] With this setting, the sealed flange locks the extrusion pipe and the configuration module on the outside, ensuring that the extrusion pipe and the configuration module are tightly connected, preventing the melt from overflowing from the gap and causing pressure changes, which is conducive to ensuring the authenticity of the measured melt pressure.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) By separately setting the first pressure sensor, the second pressure sensor and the third pressure sensor, the full process pressure monitoring of the variable speed melt in the extruder is realized, which is beneficial for researchers to improve the internal structure of the extruder according to the pressure change of the melt.

[0029] (2) By setting up the adjustment mechanism, the first pressure sensor, the second pressure sensor and the third pressure sensor can adjust the extension length in the device, so that the first pressure sensor, the second pressure sensor and the third pressure sensor can adjust the extension length according to the thickness of the melt, and accurately measure the pressure of melts of different thicknesses, thereby improving the application range of the variable speed melt pressure measuring device.

[0030] (3) Ensure that the extrusion pipe and configuration module are tightly connected through the sealed flange, which helps to avoid melt leakage and improve the accuracy of pressure measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a first embodiment of a variable speed melt pressure measuring device of the present utility model;

[0032] Figure 2 This is a structural schematic diagram of a second embodiment of a variable speed melt pressure measuring device of the utility model;

[0033] Figure 3 for Figure 2 A partial enlarged view of part A;

[0034] Figure 4 This is a schematic structural diagram of a third embodiment of a variable speed melt pressure measuring device of the present utility model.

[0035] The icon markings are explained as follows:

[0036] 1. Extrusion module; 11. Extrusion screw; 12. Extrusion pipe; 121. Mounting groove; 122. First boss; 2. Transition module; 3. Configuration module; 31. Second boss; 4. First pressure sensor; 5. Second pressure sensor; 6. Third pressure sensor; 7. Adjustment mechanism; 71. Mounting block; 72. Adjustment bolt; 73. Adjustment plate; 74. Elastic member; 8. Sealed flange. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] Example 1

[0040] like Figure 1The utility model discloses a variable speed melt pressure measuring device's first embodiment shows, including extrusion module 1, transition module 2, configuration module 3, first pressure sensor 4, second pressure sensor 5 and third pressure sensor 6, extrusion module 1 with configuration module 3 intercommunication, transition module 2 is fixed and is established at extrusion module 1 with configuration module 3 intercommunication, first pressure sensor 4 is established in extrusion module 1, second pressure sensor 5 is established in transition module 2, and third pressure sensor 6 is established in configuration module 3.

[0041] Through this setting mode, when needing to measure whether the connection design of configuration module 3 and extruder is reasonable, configuration module 3 is connected with extrusion module 1, transition module 2 is located at the connection place of configuration module 3 and extrusion module 1, melt reaches configuration module 3 after flowing through transition module 2 from extrusion module 1, first pressure sensor 4 measures the extrusion pressure of melt in extrusion module 1, second pressure sensor 5 measures the variable speed pressure of melt at transition module 2, and third pressure sensor 6 measures the configuration pressure of melt in configuration module 3, so that the pressure before, during and after variable speed of melt is obtained respectively, a complete pressure diagram is formed, which helps researchers to judge the connection condition of extruder through the pressure diagram, thereby providing help for improving the connection structure of extruder.

[0042] As an embodiment of the utility model, extrusion module 1 includes extrusion screw 11 and extrusion pipeline 12, extrusion screw 11 is arranged in extrusion pipeline 12, and extrusion screw 11 and extrusion pipeline 12 are coaxially arranged, first pressure sensor 4 is arranged in extrusion pipeline 12, and extrusion pipeline 12 is communicated with configuration module 3.

[0043] Through this setting mode, extrusion screw 11 rotates and pushes melt to move forward along extrusion pipeline 12, and first pressure sensor 4 measures the melt pressure before variable speed in extrusion pipeline 12.

[0044] As an embodiment of the utility model, extrusion module 1 includes extrusion screw 11 and extrusion pipeline 12, extrusion screw 11 is arranged in extrusion pipeline 12, and extrusion screw 11 and extrusion pipeline 12 are coaxially arranged, first pressure sensor 4 is arranged in extrusion pipeline 12, and extrusion pipeline 12 is communicated with configuration module 3.

[0045] Through this setting mode, extrusion screw 11 rotates and pushes melt to move forward along extrusion pipeline 12, and first pressure sensor 4 measures the melt pressure before variable speed in extrusion pipeline 12.

[0046] As an embodiment of the utility model, the end of extrusion pipeline 12 is also provided with mounting groove 121, and transition module 2 is clamped in mounting groove 121.

[0047] With this arrangement, the transition module 2 is inserted into the extrusion pipe 12 , which not only facilitates connection but also ensures that the transition module 2 is tightly connected to the extrusion pipe 12 , thus avoiding gaps caused by looseness during measurement and affecting the melt pressure value.

[0048] As an embodiment of the present invention, the transition module 2 is a ramp structure, the ramp on the transition module 2 is arranged toward the inside of the extrusion pipe 12 , and the second pressure sensor 5 is disposed through the transition module 2 .

[0049] Through this setting, when the melt flows from the extrusion module 1 to the configuration module 3, the melt flows along the inclined surface of the transition module 2, which is conducive to making the transition of the melt speed change process smooth, reducing the probability of dead zones in the melt, and facilitating the second pressure sensor 5 to measure the actual pressure in the speed-changing melt flow.

[0050] Example 2

[0051] like Figure 2 and Figure 3 The second embodiment of the variable speed melt pressure measuring device of the present invention is shown. This embodiment is similar to the first embodiment, except that it further includes three groups of adjustment mechanisms 7 .

[0052] As an embodiment of the present utility model, it also includes three groups of adjustment mechanisms 7, the first pressure sensor 4 is movably connected to the extrusion module 1 through a group of adjustment mechanisms 7, the second pressure sensor 5 is movably connected to the transition module 2 through a group of adjustment mechanisms 7, and the third pressure sensor 6 is movably connected to the configuration module 3 through a group of adjustment mechanisms 7.

[0053] Through this setting method, the extension length of the first pressure sensor 4, the second pressure sensor 5 or the third pressure sensor 6 can be adjusted respectively through the adjustment mechanism 7. When the melt thickness is thicker, the first pressure sensor 4, the second pressure sensor 5, and the third pressure sensor 6 can be appropriately adjusted to extend. When the melt thickness is thinner, the first pressure sensor 4, the second pressure sensor 5, and the third pressure sensor 6 can be appropriately adjusted to retract. This allows the first pressure sensor 4, the second pressure sensor 5, and the third pressure sensor 6 to accurately measure the melt pressure when facing melts of different thicknesses, which is beneficial to improving the accuracy of pressure measurement.

[0054] As an embodiment of the present utility model, the adjustment mechanism 7 includes a mounting block 71, an adjusting bolt 72, an adjusting plate 73 and an elastic member 74. The three mounting blocks 71 are fixedly embedded in the extrusion module 1, the transition module 2 and the configuration module 3 respectively. The mounting block 71 is also provided with an adjustment through hole, and the adjustment plate 73 is slidably installed in the adjustment through hole. The adjustment plate 73 is also elastically connected to the mounting block 71 through the elastic member 74. The adjusting bolt 72 is threadedly connected to the mounting block 71, and the end of the adjusting bolt 72 abuts against one side of the adjustment plate 73. The first pressure sensor 4, the second pressure sensor 5, and the third pressure sensor 6 are respectively fixedly connected to the other side of the adjustment plate 73 of the three groups of adjustment mechanisms 7.

[0055] Through this setting, when it is necessary to adjust the extension length of the first pressure sensor 4, the second pressure sensor 5 or the third pressure sensor 6, the depth of the adjusting bolt 72 inserted into the mounting block 71 is changed by rotating the adjusting bolt 72, and one side of the adjusting plate 73 abuts against the adjusting bolt 72. At the same time, the adjusting plate 73 is subjected to the elastic force of the elastic member 74 toward the adjusting bolt 72, ensuring that the adjusting plate 73 is tightly abutted against the adjusting bolt 72. The adjusting plate 73 can change its position in the mounting block 71 as the insertion depth of the adjusting bolt 72 changes, thereby driving the first pressure sensor 4, the second pressure sensor 5 or the third pressure sensor 6 to move, thereby controlling the extension length of the first pressure sensor 4, the second pressure sensor 5 and the third pressure sensor 6.

[0056] Example 3

[0057] like Figure 4 The third embodiment of the variable speed melt pressure measuring device of the present invention is shown. This embodiment is similar to the first embodiment, except that it further includes a transmission module, a host computer and a sealing flange 8, and the structure of the transition module 2 is different.

[0058] As an embodiment of the present invention, the transition module 2 is an arc-loop structure, the arc surface of the transition module 2 is arranged toward the inside of the extrusion pipe 12 , and the second pressure sensor 5 is disposed through the transition module 2 .

[0059] Through this setting, when the melt flows from the extrusion module 1 to the configuration module 3, the melt flows along the arc surface of the transition module 2, which is conducive to making the transition of the melt speed change process smooth, reducing the probability of dead zones in the melt, and facilitating the second pressure sensor 5 to measure the actual pressure in the speed-changing melt flow.

[0060] As an embodiment of the present invention, it further includes a transmission module and a host computer. The first pressure sensor 4, the second pressure sensor 5 and the third pressure sensor 6 are all communicatively connected to the transmission module, and the transmission module is communicatively connected to the host computer.

[0061] Through the setting mode, the data collected by the first pressure sensor 4, the second pressure sensor 5 and the third pressure sensor 6 can be collected and recorded by the upper computer, so that researchers can carry out research on the melt variable speed condition.

[0062] As one embodiment of the utility model, it further includes airtight flange 8, the extrusion pipeline 12 end is equipped with first boss 122, the configuration module 3 end is equipped with second boss 31, first boss 122 and second boss 31 combination form connecting boss, airtight flange 8 is installed in the outside of connecting boss.

[0063] Through the setting mode, the extrusion pipeline 12 and the configuration module 3 are locked on the outside by the airtight flange 8, so that the extrusion pipeline 12 and the configuration module 3 are connected closely, the overflow of the melt from the gap is avoided, the authenticity of the melt pressure measured is ensured.

[0064] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not exhausted. Any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A variable speed melt pressure measuring device, characterized in that: The invention comprises an extrusion module (1), a transition module (2), a configuration module (3), a first pressure sensor (4), a second pressure sensor (5) and a third pressure sensor (6), wherein the extrusion module (1) is connected to the configuration module (3), the transition module (2) is fixedly installed at the connection point between the extrusion module (1) and the configuration module (3), the first pressure sensor (4) is installed in the extrusion module (1), the second pressure sensor (5) is installed in the transition module (2), and the third pressure sensor (6) is installed in the configuration module (3).

2. The variable speed melt pressure measuring device according to claim 1, characterized in that: The extrusion module (1) comprises an extrusion screw (11) and an extrusion pipe (12), wherein the extrusion screw (11) is arranged in the extrusion pipe (12), and the extrusion screw (11) and the extrusion pipe (12) are coaxially arranged, and the first pressure sensor (4) is passed through the extrusion pipe (12), and the extrusion pipe (12) is connected to the configuration module (3).

3. The variable speed melt pressure measuring device according to claim 1, characterized in that: The first pressure sensor (4), the second pressure sensor (5) and the third pressure sensor (6) are all slightly soluble pressure sensors.

4. The variable speed melt pressure measuring device according to any one of claims 1 to 3, characterized in that: The system further comprises three groups of regulating mechanisms (7), wherein the first pressure sensor (4) is movably connected to the extrusion module (1) through a group of the regulating mechanisms (7), the second pressure sensor (5) is movably connected to the transition module (2) through a group of the regulating mechanisms (7), and the third pressure sensor (6) is movably connected to the configuration module (3) through a group of the regulating mechanisms (7).

5. The variable speed melt pressure measuring device according to claim 4, characterized in that: The adjustment mechanism (7) includes a mounting block (71), an adjustment bolt (72), an adjustment plate (73) and an elastic member (74). The three mounting blocks (71) are fixedly embedded in the extrusion module (1), the transition module (2) and the configuration module (3), respectively. The mounting block (71) is also provided with an adjustment through hole. The adjustment plate (73) is slidably installed in the adjustment through hole. The adjustment plate (73) is also elastically connected to the mounting block (71) through the elastic member (74). The adjustment bolt (72) is threadedly connected to the mounting block (71), and the end of the adjustment bolt (72) abuts against one side of the adjustment plate (73). The first pressure sensor (4), the second pressure sensor (5) and the third pressure sensor (6) are respectively fixedly connected to the other side of the adjustment plate (73) of the three groups of the adjustment mechanism (7).

6. The variable speed melt pressure measuring device according to claim 2, characterized in that: The end of the extrusion pipe (12) is further provided with a mounting groove (121), and the transition module (2) is snap-connected in the mounting groove (121).

7. The variable speed melt pressure measuring device according to claim 6, characterized in that: The transition module (2) is a ramp structure, the ramp on the transition module (2) is arranged toward the inside of the extrusion pipe (12), and the second pressure sensor (5) is arranged through the transition module (2) and is located in the middle of the ramp.

8. The variable speed melt pressure measuring device according to claim 6, characterized in that: The transition module (2) is a curved surface structure, the curved surface on the transition module (2) is arranged toward the inside of the extrusion pipe (12), and the second pressure sensor (5) is arranged through the transition module (2) and is located in the middle of the curved surface.

9. The variable speed melt pressure measuring device according to claim 1, characterized in that: It also includes a transmission module and a host computer, wherein the first pressure sensor (4), the second pressure sensor (5) and the third pressure sensor (6) are all communicatively connected to the transmission module, and the transmission module is communicatively connected to the host computer.

10. The variable speed melt pressure measuring device according to claim 2, characterized in that: It also includes a sealing flange (8), a first boss (122) is provided at the end of the extrusion pipe (12), a second boss (31) is provided at the end of the configuration module (3), the first boss (122) and the second boss (31) are combined to form a connecting boss, and the sealing flange (8) is arranged on the outside of the connecting boss.

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