阅读说明：本技术 微尺度矩形狭缝的聚合物粘度在线检测系统及检测方法 (Online polymer viscosity detection system and method for micro-scale rectangular slit ) 是由 吴旺青 赵百顺 陆近 蒋炳炎 于 2021-08-31 设计创作，主要内容包括：本公开实施例中提供了一种微尺度矩形狭缝的聚合物粘度在线检测系统及检测方法,属于测量技术领域,具体包括：注射机；粘度测试装置包括模具架、加热组件、测压组件和型腔厚度调节组件,型腔厚度调节组件设置于模具架上,且型腔厚度调节组件的芯模、密封块以及模具架的动模板组合形成矩形型腔,注射机的注射口和矩形型腔均与模具架的浇注嘴连通,加热组件与矩形型腔贴合,测压组件设置于矩形型腔底部并测量矩形型腔的压力降；控制器与测压组件的数据输出端电连接,以及,注射机和加热组件的控制端均与控制器电连接,控制器根据注射速度和接收的压力降,得到聚合物熔体的粘度。通过本公开的方案,提高了适应性、检测效率和精度。(The embodiment of the disclosure provides a polymer viscosity online detection system and a polymer viscosity online detection method for a micro-scale rectangular slit, which belong to the technical field of measurement and specifically comprise the following steps: an injection machine; the viscosity testing device comprises a mould frame, a heating component, a pressure measuring component and a cavity thickness adjusting component, wherein the cavity thickness adjusting component is arranged on the mould frame, a core mould, a sealing block and a movable mould plate of the mould frame of the cavity thickness adjusting component are combined to form a rectangular cavity, an injection port of an injection machine and the rectangular cavity are communicated with a pouring nozzle of the mould frame, the heating component is attached to the rectangular cavity, and the pressure measuring component is arranged at the bottom of the rectangular cavity and measures the pressure drop of the rectangular cavity; the controller is electrically connected with the data output end of the pressure measuring assembly, the control ends of the injection machine and the heating assembly are electrically connected with the controller, and the controller obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop. By the scheme, adaptability, detection efficiency and precision are improved.)

1. An on-line polymer viscosity detection system with a micro-scale rectangular slit is characterized by comprising:

an injection machine;

the viscosity testing device comprises a die frame, a heating component, a pressure measuring component and a die cavity thickness adjusting component, wherein the die cavity thickness adjusting component is arranged on the die frame, a core die, a sealing block and a movable die plate of the die frame of the die cavity thickness adjusting component are combined to form a rectangular die cavity, an injection port of the injection machine and the rectangular die cavity are communicated with a pouring nozzle of the die frame, the heating component is attached to the rectangular die cavity, and the pressure measuring component is arranged at the bottom of the rectangular die cavity and measures the pressure drop of the rectangular die cavity;

the controller is electrically connected with the data output end of the pressure measuring assembly, the control ends of the injection machine and the heating assembly are electrically connected with the controller, the controller controls the injection machine to set the temperature and the injection speed of the polymer melt, and the controller obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop.

2. The system of claim 1, wherein the mold frame further comprises two heat insulation plates, a first fixing plate, a positioning ring, a fixed mold plate, a heat conduction oil pipeline, a side supporting plate, an ejector pin, a return spring, a second fixing plate, a push plate and a third fixing plate;

every the heat insulating board respectively with the lateral surface of first fixed plate with the lateral surface laminating of third fixed plate, the holding ring cover is located around the pouring nozzle, the fixed die plate is with one the medial surface of first fixed plate is connected, the movable mould board with the fixed die plate is connected, heat conduction oil pipeline set up in the fixed die plate with in the movable mould board, the one end of collateral branch fagging with the movable mould board is connected, the other end and the piece of collateral branch fagging first fixed plate is connected, the thimble with reset spring all set up in on the second fixed plate, the other end of thimble passes the rectangle die cavity, the push pedal set up in the second fixed plate is close to one side of third fixed plate.

3. The system of claim 1, wherein the heating assembly comprises a heating rod, a thick film heating blade, and an insulating sheet;

the heating rod is arranged at one end of the rectangular cavity far away from the movable template;

one side of thick film heating plate with the laminating of rectangle die cavity, the another side of thick film heating plate with the laminating of insulating piece.

4. The system of claim 1, wherein the load cell assembly comprises two pressure sensors, and the two pressure sensors are respectively arranged at two ends of the rectangular cavity.

5. The system of claim 2, wherein the cavity thickness adjustment assembly further comprises a first compression block, an adjustment gasket, a cavity adjustment wedge, a wedge support plate, a second compression block, a cavity adjustment locking block, and an adjustment pull rod;

one side of the sealing block is connected with the first pressing block, the other side of the sealing block is connected with one side of the core mold, the other side of the core mold is connected with the movable mold plate, the cavity adjusting wedge block is connected with the wedge block supporting plate, one end of the cavity adjusting locking block is connected with the adjusting pull rod, the other end of the cavity adjusting locking block is connected with the second pressing block, the adjusting gasket is arranged on one surface, close to the cavity adjusting locking block, of the core mold, and the adjusting pull rod drives the cavity adjusting locking block to be matched with the second pressing block to enable the cavity adjusting wedge block to be close to or far away from the cavity adjusting locking block.

6. The method of claim 5, wherein the surfaces of the second compression block that interface with the cavity adjust wedge are beveled.

7. An on-line detection method for polymer viscosity of a micro-scale rectangular slit, which is applied to the on-line detection system for polymer viscosity of the micro-scale rectangular slit of any one of claims 1 to 6, and comprises the following steps:

providing a polymer viscosity online detection system of a micro-scale rectangular slit, wherein the polymer viscosity online detection system of the micro-scale rectangular slit comprises an injection machine, a viscosity testing device and a controller;

the controller controls the injection machine to inject polymer melt into the rectangular cavity of the viscosity testing device at a preset injection speed;

the pressure measuring assembly of the viscosity testing device detects the pressure drop of the polymer melt in the rectangular cavity;

and the controller calculates the viscosity of the polymer melt according to the preset injection speed and the pressure drop.

Technical Field

The embodiment of the disclosure relates to the technical field of measurement, in particular to a polymer viscosity online detection system and a polymer viscosity online detection method for a micro-scale rectangular slit.

Background

At present, with the wide application of micro injection molding technology, the trend of numerical simulation method for researching mold filling flow and predicting micro injection molding quality in micro injection molding is already. When the numerical simulation of the mold filling process is performed, the description of the viscosity of the polymer material in microscale (with the characteristic dimension being micron-sized or the weight being milligram-sized) influences the accuracy of the simulation result to a certain extent, that is, the rheological constitutive equation of the polymer material influences the simulation result. However, experiments show that the flow characteristics of the polymer melt in the micro-channel are different from those in the macro-scale, mainly because the characteristic size and the surface body of the cavity or the channel are larger. Therefore, macroscopically measured viscosity data cannot be used directly to characterize the viscosity of a melt at the microscale. The existing viscosity detection device can only detect under specific temperature and pressure environments, inlet pressure correction is needed during each detection, the size of a detected polymer melt is fixed, and a speed field, a stress field and a temperature field of a polymer solution are in a dynamic change process in the injection molding process.

Therefore, a micro-scale rectangular slit polymer viscosity online detection system with high adaptability, detection efficiency and detection accuracy is needed.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide an on-line polymer viscosity detection system and a detection method using a micro-scale rectangular slit, which at least partially solve the problems of low adaptability, low detection efficiency, and low accuracy in the prior art.

In a first aspect, the embodiments of the present disclosure provide an on-line polymer viscosity detection system with a micro-scale rectangular slit, including:

an injection machine;

the viscosity testing device comprises a die frame, a heating component, a pressure measuring component and a die cavity thickness adjusting component, wherein the die cavity thickness adjusting component is arranged on the die frame, a core die, a sealing block and a movable die plate of the die frame of the die cavity thickness adjusting component are combined to form a rectangular die cavity, an injection port of the injection machine and the rectangular die cavity are communicated with a pouring nozzle of the die frame, the heating component is attached to the rectangular die cavity, and the pressure measuring component is arranged at the bottom of the rectangular die cavity and measures the pressure drop of the rectangular die cavity;

the controller is electrically connected with the data output end of the pressure measuring assembly, the control ends of the injection machine and the heating assembly are electrically connected with the controller, the controller controls the injection machine to set the temperature and the injection speed of the polymer melt, and the controller obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop.

According to a specific implementation manner of the embodiment of the disclosure, the mold frame further comprises two heat insulation plates, a first fixing plate, a positioning ring, a fixed mold plate, a heat conduction oil pipeline, a side supporting plate, an ejector pin, a return spring, a second fixing plate, a push plate and a third fixing plate;

every the heat insulating board respectively with the lateral surface of first fixed plate with the lateral surface laminating of third fixed plate, the holding ring cover is located around the pouring nozzle, the fixed die plate is with one the medial surface of first fixed plate is connected, the movable mould board with the fixed die plate is connected, heat conduction oil pipeline set up in the fixed die plate with in the movable mould board, the one end of collateral branch fagging with the movable mould board is connected, the other end and the piece of collateral branch fagging first fixed plate is connected, the thimble with reset spring all set up in on the second fixed plate, the other end of thimble passes the rectangle die cavity, the push pedal set up in the second fixed plate is close to one side of third fixed plate.

According to a specific implementation of the embodiments of the present disclosure, the heating assembly includes a heating rod, a thick film heating sheet, and an insulating sheet;

the heating rod is arranged at one end of the rectangular cavity far away from the movable template;

one side of thick film heating plate with the laminating of rectangle die cavity, the another side of thick film heating plate with the laminating of insulating piece.

According to a specific implementation manner of the embodiment of the disclosure, the pressure measuring assembly comprises two pressure sensors, and the two pressure sensors are respectively arranged at two ends of the rectangular cavity.

According to a specific implementation manner of the embodiment of the disclosure, the cavity thickness adjusting assembly further comprises a first pressing block, an adjusting gasket, a cavity adjusting wedge block, a wedge block supporting plate, a second pressing block, a cavity adjusting locking block and an adjusting pull rod;

one side of the sealing block is connected with the first pressing block, the other side of the sealing block is connected with one side of the core mold, the other side of the core mold is connected with the movable mold plate, the cavity adjusting wedge block is connected with the wedge block supporting plate, one end of the cavity adjusting locking block is connected with the adjusting pull rod, the other end of the cavity adjusting locking block is connected with the second pressing block, the adjusting gasket is arranged on one surface, close to the cavity adjusting locking block, of the core mold, and the adjusting pull rod drives the cavity adjusting locking block to be matched with the second pressing block to enable the cavity adjusting wedge block to be close to or far away from the cavity adjusting locking block.

According to a specific implementation manner of the embodiment of the disclosure, the surfaces of the second pressing block connected with the cavity adjusting wedge block are both inclined surfaces.

In a second aspect, the embodiments of the present disclosure provide an online polymer viscosity detection method for a micro-scale rectangular slit, which is used in an online polymer viscosity detection system using the micro-scale rectangular slit as described in any one of the above-mentioned embodiments, and the method includes:

providing a polymer viscosity online detection system of a micro-scale rectangular slit, wherein the polymer viscosity online detection system of the micro-scale rectangular slit comprises an injection machine, a viscosity testing device and a controller;

the controller controls the injection machine to inject polymer melt into the rectangular cavity of the viscosity testing device at a preset injection speed;

the pressure measuring assembly of the viscosity testing device detects the pressure drop of the polymer melt in the rectangular cavity;

and the controller calculates the viscosity of the polymer melt according to the preset injection speed and the pressure drop.

The polymer viscosity on-line detection system of the micro-scale rectangular slit in the embodiment of the disclosure comprises: an injection machine; the viscosity testing device comprises a die frame, a heating component, a pressure measuring component and a die cavity thickness adjusting component, wherein the die cavity thickness adjusting component is arranged on the die frame, a core die, a sealing block and a movable die plate of the die frame of the die cavity thickness adjusting component are combined to form a rectangular die cavity, an injection port of the injection machine and the rectangular die cavity are communicated with a pouring nozzle of the die frame, the heating component is attached to the rectangular die cavity, and the pressure measuring component is arranged at the bottom of the rectangular die cavity and measures the pressure drop of the rectangular die cavity; the controller is electrically connected with the data output end of the pressure measuring assembly, the control ends of the injection machine and the heating assembly are electrically connected with the controller, the controller controls the injection machine to set the temperature and the injection speed of the polymer melt, and the controller obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop.

The beneficial effects of the embodiment of the disclosure are: according to the scheme, the core die, the sealing block and the movable die plate are combined to form the rectangular cavity, the specification of the cavity can be adjusted through the cavity thickness adjusting assembly, the controller controls the injection machine to inject at a set speed, the heating assembly stabilizes the temperature of the polymer melt, the pressure measuring assembly measures the pressure drop of the polymer melt in the rectangular cavity, the controller calculates the viscosity of the polymer melt by combining the injection speed and the pressure drop, and the adaptability, the detection efficiency and the precision of the polymer viscosity online detection system of the microscale rectangular slit are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an online polymer viscosity detection system with a micro-scale rectangular slit according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a part of an online polymer viscosity detection system with a micro-scale rectangular slit according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a part of a structure of another polymer viscosity online detection system with a micro-scale rectangular slit provided in the embodiment of the present disclosure;

FIG. 4 is a schematic view of a part of a structure of another polymer viscosity online detection system with a micro-scale rectangular slit provided in the embodiment of the present disclosure;

FIG. 5 is a schematic view of a part of a structure of another polymer viscosity online detection system with a micro-scale rectangular slit provided in the embodiment of the present disclosure;

fig. 6 is an online detection method for polymer viscosity of a micro-scale rectangular slit according to an embodiment of the present disclosure.

Summary of reference numerals:

an injection machine 100;

a viscosity testing device 200;

the mold comprises a mold frame 300, a heat insulation plate 301, a positioning ring 302, a pouring nozzle 303, a first fixing plate 304, a fixed mold plate 305, a heat conduction oil pipeline 306, a movable mold plate 307, a side supporting plate 308, a return spring 309, a thimble 310, a second fixing plate 311, a push plate 312 and a third fixing plate 313;

a heating assembly 400, a heating rod 401, a thick film heating sheet 402, an insulating sheet 403;

a load cell assembly 500;

a cavity thickness adjusting assembly 600, a first pressing block 601, a sealing block 602, a core mold 603, an adjusting gasket 604, a wedge supporting plate 605, a cavity adjusting wedge 606, a second pressing block 607, a cavity adjusting locking block 608 and an adjusting pull rod 609;

a controller 700.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

At present, with the wide application of micro injection molding technology, the trend of numerical simulation method for researching mold filling flow and predicting micro injection molding quality in micro injection molding is already. When the numerical simulation of the mold filling process is performed, the description of the viscosity of the polymer material in microscale (with the characteristic dimension being micron-sized or the weight being milligram-sized) influences the accuracy of the simulation result to a certain extent, that is, the rheological constitutive equation of the polymer material influences the simulation result. However, experiments show that the flow characteristics of the polymer melt in the micro-channel are different from those in the macro-scale, mainly because the characteristic size and the surface body of the cavity or the channel are larger. Therefore, macroscopically measured viscosity data cannot be used directly to characterize the viscosity of a melt at the microscale. The existing viscosity detection device can only detect under specific temperature and pressure environments, inlet pressure correction is needed during each detection, the size of a detected polymer melt is fixed, and a speed field, a stress field and a temperature field of a polymer solution are in a dynamic change process in the injection molding process.

The embodiment of the disclosure provides an online detection system for polymer viscosity of a micro-scale rectangular slit, and the method can be applied to a polymer viscosity detection process in a rectangular slit flow channel of an industrial micro-injection scene.

Referring to fig. 1, a schematic structural diagram of a polymer viscosity online detection system with a micro-scale rectangular slit is provided for an embodiment of the present disclosure. As shown in fig. 1, 2 and 3, the system mainly includes:

an injection machine 100;

the viscosity testing device 200 comprises a mold frame 300, a heating assembly 400, a pressure measuring assembly 500 and a cavity thickness adjusting assembly 600, wherein the cavity thickness adjusting assembly 600 is arranged on the mold frame 300, a core mold 603, a sealing block 602 and a movable mold plate 307 of the mold frame 300 of the cavity thickness adjusting assembly 600 are combined to form a rectangular cavity, an injection port of the injection machine 100 and the rectangular cavity are communicated with a pouring nozzle 303 of the mold frame 300, the heating assembly 400 is attached to the rectangular cavity, and the pressure measuring assembly 500 is arranged at the bottom of the rectangular cavity and measures the pressure drop of the rectangular cavity;

the controller 700 is electrically connected with the data output end of the load cell assembly 500, the control ends of the injection machine 100 and the heating assembly 400 are electrically connected with the controller 700, the controller 700 controls the injection machine 100 to set the temperature and the injection speed of the polymer melt, and the controller 700 obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop.

During assembly, the cavity thickness adjusting assembly 600 may be fixedly disposed on the mold frame 300, the cavity thickness adjusting assembly 600 includes the core mold 603 and the sealing block 602, then the movable mold plate 307, the core mold 603 and the sealing block 602 of the mold frame 300 are combined together to form the rectangular cavity, the mold frame 300 may further be provided with the pouring nozzle 303, the injection port of the injection machine 100 may be communicated with the rectangular cavity through the pouring nozzle 303, the heating assembly 400 is attached to the rectangular cavity, and the pressure measuring assembly 500 is disposed at the bottom of the rectangular cavity. The load cell assembly 500 and the controller 700 are then electrically connected to the data output of the load cell assembly 500, and the control terminals of the injector 100 and the heating assembly 400 are both electrically connected to the controller 700.

In use, the injection port of the injection machine 100 is fixed in the nozzle 303, and the controller 700 may control the injection machine 100 to inject polymer melt into the rectangular cavity through the nozzle 303 at a fixed injection speed after the injection machine 100 melts the polymer. The controller 700 may then control the heating assembly 400 to heat the polymer melt in the rectangular cavity, so that the polymer melt in the rectangular cavity can be measured while maintaining a certain temperature, or the temperature can be adjusted at any time according to the measurement requirement. Meanwhile, the pressure measuring assembly 500 arranged at the bottom of the rectangular cavity measures the pressures of the polymer melt in the rectangular cavity at different points to obtain the pressure drop, and then the controller 700 obtains the viscosity of the polymer melt according to the injection speed and the received pressure drop. Of course, the thickness of the rectangular cavity can also be adjusted by the cavity thickness adjusting assembly 600 according to the measurement requirement, so that the viscosity of polymer melts with different specifications can be measured.

In the polymer viscosity online detection system of the micro-scale rectangular slit provided by this embodiment, a rectangular cavity is formed by combining the core mold 603, the sealing block 602 and the movable mold plate 307, and the specification of the cavity can be adjusted by the cavity thickness adjusting assembly 600, the controller 700 controls the injection machine 100 to inject at a set speed, the heating assembly 400 stabilizes the temperature of the polymer melt, the pressure measuring assembly 500 measures the pressure drop of the polymer melt in the rectangular cavity, and the controller 700 calculates the viscosity of the polymer melt by combining the injection speed and the pressure drop, so that the adaptability, the detection efficiency and the precision of the polymer viscosity online detection system of the micro-scale rectangular slit are improved.

On the basis of the above embodiment, the mold frame 300 further includes two heat insulation plates 301, a first fixing plate 304, a positioning ring 302, a fixed mold plate 305, a heat conduction oil conduit 306, a side supporting plate 308, an ejector pin 310, a return spring 309, a second fixing plate 311, a push plate 312, and a third fixing plate 313;

every heat insulating board 301 respectively with the lateral surface of first fixed plate 304 with the lateral surface laminating of third fixed plate 313, the holding ring 302 cover is located around the pouring nozzle 303, fixed die plate 305 is connected with one the medial surface of first fixed plate 304, movable die plate 307 with fixed die plate 305 is connected, hot oil pipeline 306 set up in fixed die plate 305 with in the movable die plate 307, the one end of collateral branch fagging 308 with movable die plate 307 is connected, the other end of collateral branch fagging 308 with third fixed plate 313 is connected, thimble 310 with reset spring 309 all set up in on the second fixed plate 311, the other end of thimble 310 passes the rectangle die cavity, push pedal 312 set up in second fixed plate 311 is close to one side of third fixed plate.

During assembly, the mold frame 300 may further include two heat insulation plates 301, a first fixing plate 304, a positioning ring 302, a fixed mold plate 305, a heat conduction oil pipe 306, a side supporting plate 308, a return spring 309, a second fixing plate 311, a push plate 312, and a third fixing plate 313, wherein each heat insulation plate 301 is respectively attached to the outer side of the first fixing plate 304 and the outer side of the third fixing plate 313, then the positioning ring 302 is sleeved around the pouring nozzle 303, the fixed mold plate 305 is connected to the inner side of one first fixing plate 304, the movable mold plate 307 is connected to the fixed mold plate 305, the heat conduction oil pipe 306 is arranged in the fixed mold plate 305 and the movable mold plate 307, one end of the side supporting plate 308 is connected to the movable mold plate 307, and the other end of the side supporting plate 308 is connected to one first fixing plate 304, the ejector pin 310 and the return spring 309 are both arranged on the second fixing plate 311, the other end of the ejector pin 310 penetrates through the rectangular cavity, and the push plate 312 is arranged on one side of the second fixing plate 311 far away from the third fixing plate 313.

In use, the two first fixing plates 304, the side support plates 308 and the third fixing plates 313 are matched with the movable die plate 307 and the fixed die plate 305 to form a fixed structure. The positioning ring 302 is sleeved on the periphery of the pouring nozzle 303, so that the injection port of the injection machine 100 can be better fixed in position, the two heat insulation plates 301 are respectively arranged on the outer side surface of one first fixing plate 304, so as to keep the heat of the polymer melt not to be rapidly dissipated, and the heat conduction oil placed in the heat conduction oil pipeline 306 is matched to ensure that the polymer in the rectangular cavity can be kept at a certain temperature, and the operator is prevented from being scalded in the processing process. The push plate 312 is connected to the second fixing plate 311, and when the push plate 312 is pushed, the second fixing plate 311 is driven to make the thimble 310 penetrate through the rectangular cavity to eject the polymer melt, and then the second fixing plate 311 drives the thimble 310 to return to the initial position by the resilience of the return spring 309.

On the basis of the above embodiment, as shown in fig. 4, the heating assembly 400 includes a heating rod 401, a thick film heating sheet 402 and an insulating sheet 403;

the heating rod 401 is arranged at one end of the rectangular cavity far away from the movable mould plate 307;

one side of thick film heating plate 402 with the laminating of rectangle die cavity, the another side of thick film heating plate 402 with insulating piece 403 laminates.

During specific implementation, the heating rod 401 and the thick film heating plate 402 are matched to heat the rectangular cavity, so that the temperature of the hot melt of the polymer is kept, and the measurement accuracy is improved. Simultaneously, the another side of thick film heating plate 402 with insulating piece 403 laminating is in order to guarantee thick film heating plate 402 can not take place the condition of electric leakage or scald operating personnel in the heating process, has improved the measurement security.

Optionally, the pressure measuring assembly 500 includes two pressure sensors, and the two pressure sensors are respectively disposed at two ends of the rectangular cavity.

During specific implementation, the existing viscosity detection device is considered, inlet pressure correction is needed during detection at every time, operation is complex, two ends of the rectangular cavity are respectively provided with one pressure sensor, pressure values of different points of the rectangular cavity are measured to form pressure drop for subsequent measurement, and measurement efficiency is improved. Of course, other numbers of pressure sensors may be provided to achieve the effects of the present disclosure, and will not be described herein.

On the basis of the above embodiment, as shown in fig. 5, the cavity thickness adjusting assembly 600 further includes a first pressing block 601, an adjusting gasket 604, a cavity adjusting wedge 606, a wedge supporting plate 605, a second pressing block 607, a cavity adjusting locking block 608, and an adjusting pull rod 609;

one side of the sealing block 602 is connected to the first pressing block 601, the other side of the sealing block 602 is connected to one side of the core mold 603, the other side of the core mold 603 is connected to the movable mold plate 307, the cavity adjustment wedge 606 is connected to the wedge support plate 605, one end of the cavity adjustment locking block 608 is connected to the adjustment pull rod 609, the other end of the cavity adjustment locking block 608 is connected to the second pressing block 607, the adjustment gasket 604 is disposed on one side of the core mold 603 close to the cavity adjustment locking block 608, and the adjustment pull rod 609 drives the cavity adjustment locking block 608 to cooperate with the second pressing block 607 to move toward or away from the cavity adjustment wedge 606.

During assembly, one side of the sealing block 602 may be connected to the first compression block 601, the other side of the sealing block 602 may be connected to one side of the core mold 603, and the other side of the core mold 603 may be connected to the movable mold plate 307. And then the cavity adjusting wedge 606 is connected with the wedge supporting plate 605, one end of the cavity adjusting locking block 608 is connected with the adjusting pull rod 609, and the other end of the cavity adjusting locking block 608 is connected with the second pressing block 607. The adjustment shim 604 is then placed on the face of the core mold 603 adjacent to the cavity adjustment block 608.

In use, two sides of the sealing block 602 are respectively connected with the first pressing block 601 and the core mold 603, and then the inclined surface between the first pressing block 601 and the movable mold plate 307 is matched to generate pressing force, so as to further press the sealing block 602, so as to prevent the polymer melt in the rectangular cavity from leaking, and improve the sealing property.

When the adjusting pull rod 609 is pushed, the side supporting plate 308 is matched with the cavity adjusting locking block 608 to push the second pressing block 607 to be driven to the cavity adjusting wedge 606, so that the accuracy of the thickness of the rectangular cavity is ensured, the core mold 603 is prevented from retracting, and the detection efficiency and the safety are improved.

When the cavity thickness of the rectangular cavity needs to be adjusted, the adjusting pull rod 609 can be pulled to enable the second pressing block 607 to retreat, the locking force between the second pressing block and the cavity adjusting wedge 606 is released, then the thickness of the adjusting gasket 604 is adjusted, the adjusting pull rod 609 is pushed again to be locked and fixed, the cavity thickness adjustment is completed, and the adaptability is improved.

Optionally, the surfaces of the second pressing block 607 connected with the cavity-adjusting wedge 606 are both inclined surfaces.

In specific implementation, the surfaces of the second pressing block 607 connected with the cavity adjusting wedge 606 are both inclined surfaces, and when the adjusting pull rod 609 pushes, the cavity adjusting wedge 606 is matched with the second pressing block 607 to form a self-locking angle, so that the core mold 603 is prevented from retreating, the thickness of the cavity is ensured to be accurate, and the measurement accuracy is improved.

As shown in fig. 6, an embodiment of the present disclosure further provides an online detection method for polymer viscosity of a micro-scale rectangular slit, where the method includes:

s601, providing a polymer viscosity online detection system of a micro-scale rectangular slit, wherein the polymer viscosity online detection system of the micro-scale rectangular slit comprises an injection machine, a viscosity testing device and a controller;

s602, the controller controls the injection machine to inject polymer melt into the rectangular cavity of the viscosity testing device at a preset injection speed;

during specific implementation, the controller can control the injection machine to inject the polymer melt into the rectangular cavity of the viscosity testing device at a preset injection speed according to actual measurement requirements, and the injection speed during the injection can be stored simultaneously so as to facilitate the subsequent data analysis and processing process.

S603, detecting the pressure drop of the polymer melt in the rectangular cavity by a pressure measuring assembly of the viscosity testing device;

in specific implementation, after the polymer melt is injected into the rectangular cavity, the pressure drop in the rectangular cavity may be detected by the pressure measuring assembly, and specifically, the pressure drop may be calculated by measuring the pressure between two points in the rectangular cavity.

S604, the controller calculates the viscosity of the polymer melt according to the preset injection speed and the pressure drop.

After obtaining the pressure drop, data of the pressure drop may be sent to the controller, which calculates the viscosity of the polymer melt from the preset injection speed and the pressure drop.

According to the polymer viscosity on-line detection method for the micro-scale rectangular slit provided by the embodiment of the disclosure, the viscosity of the polymer melt is calculated by controlling the injection speed of the polymer melt and detecting the pressure drop corresponding to the polymer melt in the rectangular cavity, so that the detection efficiency and the detection precision of the polymer viscosity on-line detection method for the micro-scale rectangular slit are improved.

In summary, according to the polymer viscosity online detection system and the detection method for the micro-scale rectangular slit in the embodiments of the present disclosure, by providing the injection machine, the viscosity test device and the controller, the thickness of the rectangular cavity and the injection speed of the injection machine can be adjusted according to actual measurement requirements, and then by combining with the pressure drop obtained by directly measuring the pressure of the rectangular cavity, the viscosities corresponding to polymer melts of different specifications in different temperature fields and stress field speed fields are calculated, so that the adaptability, the detection efficiency and the detection accuracy of the polymer viscosity online detection for the micro-scale rectangular slit are improved.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.