A measuring device and method for measuring rubber Mooney viscosity

Abstract

The present invention relates to a measuring device and method for rubber Mooney viscosity, wherein the measuring device comprises an internal mixer, a driving device, a flow guide device, a measuring flow channel, a return flow channel, a pressure sensor and a torque sensor; one end of the measuring flow channel is connected to the internal mixer mixing chamber, and the other end is connected to one end of the return flow channel; the other end of the return flow channel is connected to the internal mixer mixing chamber; the flow guide device is arranged in the measuring flow channel; the driving device is used to drive the flow guide device to rotate; the pressure sensor is arranged in the measuring flow channel; the torque sensor is used to detect the torque of the rubber on the flow guide device. The rubber material being processed is squeezed into the rubber Mooney viscosity measuring device through the rubber internal mixer and measured online, and the measured rubber material is returned to the rubber internal mixer to continue mixing, so as to achieve the effect of continuous online measurement, overcome the limitation that the traditional viscosity rheometer can only measure the rubber viscosity when the rubber internal mixer is stopped, and realize online monitoring of rubber physical parameters.

Description

Technical Field

[0001] The invention relates to the technical field of rubber processing engineering, in particular to a measuring device and a measuring method for rubber Mooney viscosity. Background Art

[0002] Mooney viscosity is an important parameter in the processing of rubber. It refers to the measurement of the torque exerted by the rubber on the rotation of the viscometer rotor when the rotor is rotated in a cylindrical mold cavity filled with rubber under certain experimental conditions. The Mooney viscosity of rubber is expressed as the reaction torque of the rubber on the rotation of the viscometer rotor, and the unit is Mooney viscosity.

[0003] The plasticization of rubber is essentially a process in which a rubber macromolecule chain is transformed into a rubber micromolecule through compression, shearing, displacement, etc. In this process, the rubber macromolecule chain breaks, the relative molecular weight decreases, the viscosity decreases, and the elasticity decreases, making the rubber raw rubber easier to process. In the subsequent processing, it is easier to mix the rubber with the compounding agent to form a uniform dispersed phase and reduce the machine power consumption in the subsequent processing steps. Therefore, the smaller the Mooney viscosity value measured after plasticization of the rubber raw rubber, the more the rubber macromolecule chain breaks, the more the relative molecular weight decreases, the better the fluidity of the rubber, and the more convenient the subsequent rubber processing. Conversely, the larger the Mooney viscosity value measured after plasticization of the rubber raw rubber, the less the rubber macromolecule chain breaks. Therefore, in the rubber processing process, the control of the rubber Mooney viscosity after plasticization plays a vital role.

[0004] Internal mixer is an important equipment in rubber processing, and its functional parts are internal mixing chamber and rotor. During internal mixing, raw rubber is added into the internal mixing chamber through the feeding device, and the rotor rotates at a certain speed. The raw rubber in the internal mixing chamber is constantly rolled and compressed and sheared under the action of the internal mixer rotor, so that the rubber macromolecular chain is broken, so that the plasticized rubber is more suitable for subsequent processing. The physical quantity that generally quantifies the degree of breakage of the rubber macromolecular chain is Mooney viscosity.

[0005] The existing method for measuring the Mooney viscosity of rubber is as follows: step one, adding the rubber raw material into a rubber internal mixer and plasticizing it, step two, taking out or partially taking out the plasticized rubber raw material, step three, placing the taken out rubber sample into the mold cavity of another independent disc shear viscometer, closing the mold cavity and heating and pressurizing it, and step four, using a viscometer to measure the Mooney viscosity of the rubber.

[0006] The existing method for measuring rubber Mooney viscosity requires stopping the internal mixer during the actual production process, taking out or partially taking out the rubber raw materials and putting them back into another independent disc shear viscometer. This method has the disadvantages of low production efficiency, inability to monitor rubber physical parameters online, and large energy waste. Summary of the invention

[0007] In view of the technical problems existing in the prior art, one of the purposes of the present invention is to provide a measuring device for rubber Mooney viscosity, which does not require the internal mixer to be shut down during the measurement process, can realize online monitoring of rubber physical parameters, has high production efficiency and reduces power consumption.

[0008] In view of the technical problems existing in the prior art, the second purpose of the present invention is to provide a method for measuring the Mooney viscosity of rubber, which does not require the internal mixer to be shut down during the measurement process, can realize online monitoring of rubber physical parameters, has high production efficiency and reduces power consumption.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A device for measuring the Mooney viscosity of rubber, comprising an internal mixer, a driving device, a flow guide device, a measuring flow channel, a reflux flow channel, a pressure sensor and a torque sensor;

[0011] One end of the measuring flow channel is connected to the mixing chamber of the internal mixer, and the other end is connected to one end of the reflux flow channel;

[0012] The other end of the reflux channel is connected to the mixing chamber of the internal mixer;

[0013] The flow guide device is arranged in the measuring flow channel;

[0014] The driving device is used for driving the flow guide device to rotate in the measuring flow channel;

[0015] The pressure sensor is arranged in the measuring flow channel;

[0016] The torque sensor is arranged at one side of the flow guide device and is connected to the pressure sensor to detect and measure the torque of the rubber in the flow channel on the flow guide device.

[0017] Furthermore, the flow guiding device is a screw.

[0018] Furthermore, the measuring flow channel is connected to the lower part of the mixing chamber.

[0019] Further, the height of one end of the measuring flow channel is greater than the height of the other end of the measuring flow channel.

[0020] Furthermore, a plurality of pressure sensors are provided, and the plurality of pressure sensors are sequentially spaced apart along the extending direction of the measuring flow channel.

[0021] Furthermore, the return flow channel is arranged below the measuring flow channel.

[0022] Furthermore, a conveying device for conveying rubber is provided in the return flow channel.

[0023] Furthermore, the number of the return flow channel is at least one.

[0024] Furthermore, the measuring flow channel and the reflux flow channel are respectively provided with bosses for fixed connection with the mixing chamber.

[0025] A method for measuring rubber Mooney viscosity comprises the following steps:

[0026] The internal mixer squeezes the rubber in the mixing chamber into the measuring flow channel;

[0027] The flow guide device rotates to move the rubber in the measuring flow channel toward the return flow channel;

[0028] The pressure sensor in the measuring channel senses the pressure applied by the rubber and sends a signal to the torque sensor;

[0029] After receiving the signal, the torque sensor detects and measures the torque of the rubber in the flow channel on the flow guide device, thereby measuring the Mooney viscosity of the rubber;

[0030] The rubber in the measuring channel returns to the mixing chamber through the return channel.

[0031] In general, the present invention has the following advantages:

[0032] The rubber Mooney viscosity measuring device is combined with the mixing chamber of the rubber mixer. The rubber material being processed is squeezed into the rubber Mooney viscosity measuring device through the periodic rotation of the rubber mixer rotor and measured online. After the measurement, the measured rubber material returns to the mixing chamber of the rubber mixer through the reflux channel to continue mixing. The rubber being processed in the mixing chamber still automatically repeats the above action in the next rotation cycle of the rubber mixer rotor, thereby achieving the effect of continuous online measurement of the rubber being processed. The limitation of the traditional viscosity rheometer that the rubber viscosity can only be measured when the rubber mixer is stopped is overcome. The mixer does not need to be stopped during the measurement process, and the physical parameters of rubber can be monitored online, with high production efficiency and reduced power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the assembly relationship between the Mooney viscosity measuring device and the mixing chamber of the rubber mixer.

[0034] Figure 2 Schematic diagram of the structure of the Mooney viscosity measuring device.

[0035] Figure 3 This is a schematic diagram of the structure of the rubber mixing chamber.

[0036] Reference numerals:

[0037] 1-pressure sensor; 2-rotating shaft; 3-torque sensor; 4-motor; 5-screw; 6-measuring flow channel; 7-return flow channel; 8-boss; 9-mixing chamber; 10-rotor. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below.

[0039] Example

[0040] like Figure 1-3 As shown, a device for measuring the Mooney viscosity of rubber includes an internal mixer, a driving device, a flow guide device, a measuring flow channel 6, a reflux flow channel 7, a pressure sensor 1 and a torque sensor 3;

[0041] One end of the measuring flow channel 6 is connected to the mixing chamber 9 of the internal mixer, and the other end is connected to one end of the reflux flow channel 7;

[0042] The other end of the reflux channel 7 is connected to the mixing chamber 9 of the internal mixer;

[0043] The flow guide device is arranged in the measuring flow channel 6;

[0044] The driving device is used to drive the flow guide device to rotate in the measuring flow channel 6;

[0045] The pressure sensor 1 is arranged in the measuring flow channel 6, and is used to detect the pressure of the rubber in the measuring flow channel 6 and send a signal to the torque sensor 3;

[0046] The torque sensor 3 is arranged at one side of the flow guide device and connected to the pressure sensor 1 , and is used to receive the signal sent by the pressure sensor 1 and detect the torque of the rubber in the flow channel 6 on the flow guide device.

[0047] Specifically, the measuring device of this embodiment includes an internal mixer and a Mooney viscosity measuring device, and the Mooney viscosity measuring device includes a driving device, a flow guide device, a measuring flow channel 6 , a reflux flow channel 7 , a pressure sensor 1 and a torque sensor 3 .

[0048] The internal mixer chamber 9 is provided with two openings, which are respectively connected to the measuring flow channel 6 and the reflux flow channel 7 of the Mooney viscosity measuring device.

[0049] During operation, after rubber is added to the mixing chamber 9, the mixer and the Mooney viscosity measuring device are started respectively, the rotor 10 in the mixing chamber 9 starts to rotate, and the flow guide device in the measuring flow channel 6 also starts to rotate under the drive of the driving device. The rubber is squeezed into the measuring flow channel 6 by the rotor 10 in the mixing chamber 9, and the rubber moves from one end of the measuring flow channel 6 to the other end of the measuring flow channel 6 under the guidance of the flow guide device in the measuring flow channel 6. When the pressure sensor 1 in the measuring flow channel 6 senses the pressure applied by the rubber, it sends a signal to the torque sensor 3, and the torque sensor 3 detects the torque of the rubber in the measuring flow channel 6 on the flow guide device and outputs the torque data to the external device, so that the Mooney viscosity of the rubber can be measured and monitored online.

[0050] The rubber in the measuring flow channel 6 enters the return flow channel 7 under the guidance of the guide device, and continues to flow back to the mixing chamber 9 to continue mixing. Under the action of the periodic rotation of the mixer rotor 10, the rubber periodically enters the rubber Mooney viscosity measuring device again and automatically performs online measurement of the rubber Mooney viscosity of the next rotor 10 cycle.

[0051] This embodiment adopts a method of combining a rubber Mooney viscosity measuring device with a rubber internal mixer mixing chamber 9. The rubber material being processed is squeezed into the rubber Mooney viscosity measuring device through the periodic rotation of the rubber internal mixer rotor 10 and measured online. After the measurement is completed, the measured rubber material returns to the rubber internal mixer mixing chamber 9 through the reflux flow channel 7 to continue mixing. The rubber being processed in the mixing chamber 9 still automatically repeats the above action in the next rotation cycle of the rubber internal mixer rotor 10, achieving an effect of continuous online measurement of the rubber being processed. This embodiment is cleverly designed, using the measuring flow channel 6 and the reflux flow channel 7 to connect with the mixing chamber 9 to form a rubber circuit, overcoming the limitation that the traditional viscosity rheometer can only measure the rubber viscosity when the rubber internal mixer is stopped. It has the advantages of not having to stop the internal mixer during the measurement process, being able to realize online monitoring of rubber physical parameters, high production efficiency, and reduced power consumption.

[0052] In this embodiment, the flow guide device is a screw 5. The screw 5 is connected to the driving device through the rotating shaft 2. The pressure sensor 1 is located on the inner wall of the measuring flow channel 6 and does not interfere with the screw thread of the screw 5. The torque sensor 3 is arranged on the rotating shaft 2. In this embodiment, the motor 4 is used as the driving device, and the screw 5 is a single screw.

[0053] Since the rubber is continuously compressed and sheared by the screw 5 during its spiral movement in the measuring channel 6 toward the return channel 7, it can better simulate the plasticizing condition in the mixing chamber 9, thereby making the detected torque of the rubber on the screw 5 in the measuring channel 6 more consistent with the Mooney viscosity of the rubber.

[0054] In this embodiment, the rubber Mooney viscosity measuring device is located on the side of the rubber mixing chamber 9. The measuring flow channel 6 and the return flow channel 7 are respectively provided with bosses 8, and are fixedly connected to the rubber mixing chamber 9 through the bosses 8. The measuring flow channel 6 is connected to the lower part of one side of the mixing chamber 9, so that when the mixer rotor 10 rotates, it is easier to squeeze the rubber in the mixing chamber 9 into the measuring flow channel 6. The height of one end of the measuring flow channel 6 is greater than the height of the other end of the measuring flow channel 6, and the return flow channel 7 is arranged below the measuring flow channel 6, so that the rubber in the measuring flow channel 6 is easier to move toward the return flow channel 7 and further flow into the return flow channel 7.

[0055] Preferably, a conveying device (not shown in the figure) for conveying rubber is provided in the reflux channel 7, such as a screw device or a propulsion device in the prior art, so that the reflux flow can flow back to the rubber mixing chamber 9 faster.

[0056] The return flow channel 7 can be a single return flow channel or multiple return flow channels.

[0057] There are multiple pressure sensors 1 , and the multiple pressure sensors 1 are sequentially spaced apart along the extending direction of the measuring flow channel 6 .

[0058] Multiple pressure sensors 1 are connected in series with the torque sensor 3 in sequence. When multiple pressure sensors 1 all detect rubber pressure, it indicates that the rubber has filled the measuring channel 6. At this time, the series circuit is connected, and the torque sensor 3 starts to work. The torque of the rubber in the measuring channel 6 on the guide device detected by it is more consistent with the Mooney viscosity of the rubber, and the measurement is more accurate.

[0059] Specifically, the measurement process of rubber Mooney viscosity is as follows:

[0060] Step 1: Add rubber into the rubber mixing chamber 9;

[0061] Step 2: Start the rubber mixer to rotate the mixer rotor 10 in the rubber mixer mixing chamber 9, and start the rubber Mooney viscosity measuring device to rotate the screw 5 in the measuring flow channel 6, and the pressure sensor 1 and the torque sensor 3 start working;

[0062] Step 3: The rubber is squeezed into the measuring channel 6 by the internal mixer rotor 10. Under the rotation of the screw 5, the rubber moves toward the other end of the measuring channel 6 and gradually fills the measuring channel 6. At the same time, the pressure sensor 1 collects the pressure value of the polymer melt in the measuring channel 6. When the data of each pressure sensor 1 in the measuring channel 6 are displayed, it indicates that the rubber fills the measuring channel 6. The torque sensor 3 starts to measure the reverse torque of the rubber in the measuring channel 6 on the screw 5 and outputs the torque data, thereby measuring the Mooney viscosity of the rubber.

[0063] Step 4: Driven by the screw 5, the rubber flows into the reflux channel 7 and continues to flow back to the mixing chamber 9 for further mixing. Under the action of the periodic rotation of the mixer rotor 10, the rubber periodically enters the rubber Mooney viscosity measuring device again and automatically repeats step 3, thereby performing online measurement of the rubber Mooney viscosity of the next rotor 10 cycle.

[0064] A method for measuring the rubber Mooney viscosity, using a rubber Mooney viscosity measuring device for measurement, comprises the following steps:

[0065] The internal mixer squeezes the rubber in the internal mixing chamber 9 into the measuring flow channel 6;

[0066] The flow guide device rotates to move the rubber in the measuring flow channel 6 toward the return flow channel 7;

[0067] After the pressure sensor 1 in the measuring flow channel 6 senses the pressure applied by the rubber, it sends a signal to the torque sensor 3;

[0068] After receiving the signal, the torque sensor 3 detects and measures the torque of the rubber on the flow guide device in the flow channel 6, thereby measuring the Mooney viscosity of the rubber;

[0069] The rubber in the measuring flow channel 6 returns to the mixing chamber 9 through the reflux flow channel 7 .

[0070] The measurement method of this embodiment squeezes the rubber into the measuring channel 6 through the internal mixer, performs online measurement of the Mooney viscosity of the rubber in the measuring channel 6, and then returns the rubber to the internal mixer 9 through the reflux channel 7 to continue plasticizing, and repeats the cycle in this way. During the measurement process, there is no need to shut down the internal mixer, and online monitoring of the physical parameters of the rubber can be achieved, which has the advantages of high production efficiency and reduced power consumption.

[0071] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A device for measuring rubber Mooney viscosity, characterized in that: It includes an internal mixer, a driving device, a flow guide device, a measuring flow channel, a return flow channel, a pressure sensor and a torque sensor; One end of the measuring flow channel is connected to the mixing chamber of the internal mixer, and the other end is connected to one end of the reflux flow channel; The other end of the reflux channel is connected to the mixing chamber of the internal mixer; The flow guide device is arranged in the measuring flow channel; The driving device is used for driving the flow guide device to rotate in the measuring flow channel; The pressure sensor is arranged in the measuring flow channel; The torque sensor is arranged on one side of the flow guide device and is connected to the pressure sensor to detect and measure the torque of the rubber in the flow channel on the flow guide device; The flow guiding device is a screw; A conveying device for conveying rubber is arranged in the return flow channel.

2. A device for measuring the rubber Mooney viscosity according to claim 1, characterized in that: The measuring flow channel is connected to the lower part of the mixing chamber.

3. A device for measuring rubber Mooney viscosity according to claim 1, characterized in that: The height of one end of the measuring flow channel is greater than the height of the other end of the measuring flow channel.

4. A device for measuring the rubber Mooney viscosity according to claim 1, characterized in that: There are multiple pressure sensors, and the multiple pressure sensors are arranged in sequence and at intervals along the extending direction of the measuring flow channel.

5. A device for measuring the rubber Mooney viscosity according to claim 1, characterized in that: The return flow channel is arranged below the measuring flow channel.

6. A device for measuring the rubber Mooney viscosity according to claim 1, characterized in that: The number of the return flow channel is at least one.

7. A device for measuring rubber Mooney viscosity according to claim 1, characterized in that: The measuring flow channel and the return flow channel are respectively provided with bosses for fixed connection with the mixing chamber.

8. A method for measuring rubber Mooney viscosity, characterized in that: The measurement is performed using the rubber Mooney viscosity measuring device according to any one of claims 1 to 7, comprising the following steps: The internal mixer squeezes the rubber in the mixing chamber into the measuring flow channel; The flow guide device rotates to move the rubber in the measuring flow channel toward the return flow channel; The pressure sensor in the measuring channel senses the pressure applied by the rubber and sends a signal to the torque sensor; After receiving the signal, the torque sensor detects and measures the torque of the rubber in the flow channel on the flow guide device, thereby measuring the Mooney viscosity of the rubber; The rubber in the measuring channel returns to the mixing chamber through the return channel.

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