WO2021027248A1

WO2021027248A1 - Method for controlling desulfurization and discharge of reclaimed rubber and control device therefor

Info

Publication number: WO2021027248A1
Application number: PCT/CN2020/071127
Authority: WO
Inventors: 梁云标
Original assignee: 福建省邵武市恒晖橡胶再生有限公司
Priority date: 2019-08-09
Filing date: 2020-01-09
Publication date: 2021-02-18

Abstract

A method for controlling desulphurization and discharge of a reclaimed rubber and a control device for same. The method comprises the following steps: step 1, putting waste rubber powder into a stirring-type desulfurization tank with a constant stirring shaft speed, and heating and stirring same to desulfurize the waste rubber powder; and step 2, judging whether the viscosity of the rubber reaches an expected viscosity by acquiring the torque of a motor connected to a stirring shaft connected to the stirring-type desulfurization tank or by acquiring a current value of a motor driving a stirring shaft connected to the desulfurization tank, and if so, stopping heating and stirring the desulfurization tank and discharging the material, so as to obtain a desulfurized rubber. Compared with the conventional method in which automatic discharging is realized by setting the heating temperature and the heating time, the viscosity error of the devulcanized rubbers obtained from different batches is greatly reduced, the error is always controlled at 0.5-4.5%, and the quality stability of the reclaimed rubber is greatly improved.

Description

[Invention title developed by ISA according to Rule 37.2] 　Desulfurization and discharge control method and control device of reclaimed rubber

Technical field

The invention relates to the technical field of rubber processing, in particular to a desulfurization and discharge control method of reclaimed rubber and a control device thereof.

Background technique

The desulfurization of waste rubber powder is an important step in the production process of reclaimed rubber. The desulfurization of waste rubber mainly involves adding and stirring the waste rubber, and properly injecting air to break the sulfur bonds of the waste rubber; in the traditional waste rubber desulfurization process The control conditions for discharging are usually temperature and time, that is, the rubber is discharged after being stirred and reacted for a predetermined time at a certain temperature in the devulcanization device. However, the quality of the devulcanized rubber discharged by the above discharging control method is not stable, and different batches The Mooney value error of the discharged devulcanized rubber reaches 10-20%.

technical problem

The technical problem to be solved by the present invention is to provide a desulfurization and discharge control method for regenerated rubber and a control device thereof. By monitoring the torque value of the motor driving the stirring shaft as a standard to measure the degree of rubber devulcanization, the quality of the devulcanized rubber discharge can be greatly improved Stable.

Technical solutions

In order to solve the above technical problems, the technical solutions adopted by the present invention are:

A desulfurization and discharge control method for reclaimed rubber includes the following steps:

Step 1. Put the waste rubber powder into a stirring desulfurization tank with a constant stirring shaft speed and heat and stir to desulfurize the waste rubber powder;

Step 2: Determine whether the viscosity of the rubber reaches the expected viscosity by obtaining the torque of the motor connected to the stirring shaft of the stirred desulfurization tank or by obtaining the current value of the motor connected to the motor driving the stirring shaft of the desulfurization tank. If so, the desulfurization tank Stop heating and stirring, and discharge to obtain devulcanized rubber.

A desulfurization and discharge control device for regenerated rubber, including a desulfurization tank, a stirring shaft, a heating device, a reducer, a driving motor, a torque sensor and a controller;

The stirring shaft penetrates the stirring tank, the stirring shaft is connected to the drive motor through a reducer, the torque sensor is connected between the motor and the reducer; the controller is respectively connected to the heating device, the drive motor and the torque sensor Electric connection.

Beneficial effect

The beneficial effect of the present invention is that in the desulfurization and discharge control method of reclaimed rubber provided by the present invention, the torque of the motor connected to the stirring shaft of the stirring desulfurization tank is obtained or the torque of the motor connected to the stirring shaft of the desulfurization tank is obtained. The current value is used to determine whether the viscosity of the rubber reaches the expected viscosity. If it is, the desulfurization tank stops heating and stirring, and discharges the material to obtain devulcanized rubber. Compared with the traditional method of automatic discharging by setting the heating temperature and heating time, the viscosity error of the devulcanized rubber obtained from different batches is greatly reduced, and the error is always controlled at 0.5-4.5%, which greatly improves the regeneration. The quality stability of rubber.

Description of the drawings

1 is a schematic structural diagram of a desulfurization and discharge control device for reclaimed rubber according to a specific embodiment of the present invention;

Label description:

1. Desulfurization tank; 2. Stirring shaft; 3. Reducer; 4. Drive motor; 5. Torque sensor (current monitoring device); 6. Controller.

Embodiments of the invention

In order to describe in detail the technical content, the achieved purpose and the effect of the present invention, the following description will be given in conjunction with the embodiments and the accompanying drawings.

The most critical idea of the present invention is to determine whether the waste rubber powder reaches the required viscosity by monitoring whether the torque value output by the motor reaches the preset value, so as to control the motor and the heating device to stop and discharge the material.

Please refer to Figure 1. The present invention relates to a desulfurization and discharge control method for reclaimed rubber, which includes the following steps:

Step 1. Put waste rubber powder into the stirring type desulfurization tank 1 with a constant rotation speed of the stirring shaft 2 and heat and stir to desulfurize the waste rubber powder;

Step 2: Determine whether the viscosity of the rubber reaches the expected viscosity by obtaining the torque of the motor connected to the stirring shaft 2 connected to the stirring desulfurization tank 1. If so, the desulfurization tank 1 stops heating and stirring, and discharges the material to obtain the devulcanized rubber.

In the above-mentioned desulfurization and discharge control method of reclaimed rubber, the viscosity of the waste rubber powder increases continuously during the mixing and heating process of the rubber powder. In order to maintain a constant rotation speed of the stirring shaft 2, the torsion force on the stirring shaft 2 will increase. , The torque it bears is borne by the motor, so the torque output by the motor increases accordingly. Therefore, the viscosity of the waste rubber powder is positively related to the torque output by the motor, which can be set according to the viscosity value of the devulcanized rubber that needs to be discharged. Determine the torque output by the corresponding motor, and determine whether the waste rubber powder reaches the required viscosity by monitoring whether the torque value output by the motor reaches the preset value, so as to control the motor and heating device to stop and discharge, compared with traditional In the method, the automatic discharging method is realized by setting the heating temperature and processing time. The viscosity error of the devulcanized rubber obtained from different batches is greatly reduced, and the error is always controlled at 0.5-1%, which greatly improves the quality and stability of the regenerated rubber Sex.

Further, in the above described method for desulfurization and discharging control of reclaimed rubber, the step 2 specifically includes: obtaining the torque value of the motor through the torque sensor 5 connected to the motor shaft, receiving the motor torque value obtained by the torque sensor 5 through the PLC, and determining the motor Whether the torque value reaches the preset value, if it is, the PLC controls the motor shaft to stop rotating, and the PLC controls the heating device to stop heating the desulfurization tank 1, and controls the discharge to obtain the devulcanized rubber.

It can be seen from the above description that the user can conduct a preliminary experiment before determining the conditions to determine the relationship between the output torque value of the motor shaft and the rubber viscosity, so as to determine the motor torque value corresponding to the required viscosity, by presetting on the PLC The torque value, when the torque sensor 5 monitors that the motor output torque value reaches the preset value, the motor and the heating device are controlled to stop, and the discharge is controlled.

Further, in the above described method for controlling desulfurization and discharging of recycled rubber, the step 2 is specifically: the step 2 is specifically: obtaining the torque value of the motor through the torque sensor 5 connected to the motor shaft, and receiving the torque value of the motor through the PLC. Determine whether the motor torque value reaches the preset value. If it is, the PLC controls the motor shaft to stop rotating, and at the same time, the PLC controls the heating device to stop heating, and controls the flapper valve of the discharge port of the desulfurization tank 1 to open to make the rubber Discharge to obtain devulcanized rubber.

It can be seen from the above description that a flapper valve is provided at the discharge port, and the flapper valve, heating device, motor, and torque sensor 5 are all electrically connected to the PLC, and the automatic control of the above device can be realized by writing the PLC program.

The present invention also relates to a desulfurization and discharge control device for regenerated rubber, which includes a desulfurization tank 1, a stirring shaft 2, a heating device, a reducer 3, a drive motor 4, a torque sensor 5 and a controller 6;

The stirring shaft 2 penetrates the stirring tank, the stirring shaft 2 is connected to the drive motor 4 through the reducer 3, the torque sensor 5 is connected between the motor and the reducer 3; the controller 6 is connected to the heating The device, the driving motor 4 and the torque sensor 5 are electrically connected.

Further, the structure of the above described reclaimed rubber desulfurization and discharge control device further includes a valve, the valve is arranged at the discharge port of the desulfurization tank 1, and the valve is electrically connected to the controller 6.

Further, in the structure of the desulfurization and discharge control device for reclaimed rubber, the stirring shaft 2 is parallel to the vertical direction.

Further, in the structure of the desulfurization and discharge control device for reclaimed rubber, the controller 6 is a PLC.

Further, in the structure of the desulfurization and discharge control device for reclaimed rubber, the valve is a plug-in valve.

Further, in the structure of the desulfurization and discharge control device for reclaimed rubber, the desulfurization tank 1 is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller 6.

Please refer to Figure 1. The present invention relates to a rubber desulfurization control method, including the following steps:

Step 1: Put the waste rubber powder into the stirring type desulfurization tank 1 with a constant rotation speed of the stirring shaft 2 and heat and stir to desulfurize the waste rubber powder;

Step 2: By obtaining the current value of the motor connected to the stirring shaft 2 of the desulfurization tank 1 to determine whether the viscosity of the rubber reaches the expected viscosity, if so, the desulfurization tank 1 stops heating and stirring, and discharges materials to obtain devulcanized rubber.

In the above-mentioned rubber devulcanization control method, the viscosity of the waste rubber powder continues to increase during the mixing and heating process of the rubber powder. In order to maintain a constant speed of the stirring shaft 2, the output current of the motor continues to increase while the voltage remains unchanged. Therefore, the viscosity of the waste rubber powder is positively correlated with the current value output by the motor. The current value output by the corresponding motor can be set according to the viscosity value of the devulcanized rubber that needs to be discharged. By detecting whether the current value output by the motor is Reach the preset value to determine whether the waste rubber powder reaches the required viscosity, thereby controlling the shutdown and discharging. Compared with the traditional method, the automatic discharging method is achieved by setting the heating temperature and heating time. The viscosity error of the devulcanized rubber is greatly reduced, and the error is always controlled at 0.5-4.5%, which greatly improves the quality stability of recycled rubber.

Further, in the above-mentioned rubber desulfurization control method, the step 2 specifically includes: acquiring the current value of the motor through a current sensor electrically connected to the motor, receiving the current value of the motor acquired by the inverter through the PLC, and determining whether the current value of the motor reaches the preset value. Set the value, if it is, the PLC controls the motor shaft to stop rotating, and at the same time the PLC controls the heating device to stop heating the desulfurization tank 1, and controls the discharge to obtain the devulcanized rubber.

It can be seen from the above description that the user can conduct a preliminary experiment before determining the conditions to determine the relationship between the motor output current value and the rubber viscosity, so as to determine the motor current value corresponding to the desired viscosity, and preset the current value on the PLC When the current sensor detects that the motor output current value reaches the preset value, the motor is controlled to stop rotating, the heating device stops heating the desulfurization tank 1, and controls the discharge.

Further, in the above-mentioned rubber desulfurization control method, the step 2 specifically includes: obtaining the current value of the motor through the inverter electrically connected to the motor, receiving the motor current value obtained by the inverter through the PLC, and determining whether the current value of the motor reaches the predetermined value. Set the value, if it is, the PLC controls the motor shaft to stop rotating, and at the same time, the PLC controls the heating device to stop heating the desulfurization tank 1, and controls the flap valve of the discharge port of the desulfurization tank 1 to open, so that the rubber is discharged and devulcanized rubber is obtained.

It can be seen from the above description that the output current value of the motor can be directly obtained through the inverter, without the need to install an additional ammeter. Install a flapper valve at the discharge port. The flapper valve, heating device, motor, and inverter are all electrically connected to the PLC. The automatic control of the above devices can be realized by writing PLC programs.

The present invention also relates to a rubber desulfurization control device, including a desulfurization tank 1, a stirring shaft 2, a heating device, a reducer 3, a driving motor 4, a current monitoring device 5 and a controller 6;

The stirring shaft 2 penetrates through the stirring tank, the stirring shaft 2 is drivingly connected to the driving motor 4 through the reducer 3, and the current monitoring device 5 is electrically connected to the driving motor 4;

The current monitoring device 5 is a device that can monitor the current of the driving motor 4;

The controller 6 is electrically connected to the heating device, the driving motor 4 and the current monitoring device 5 respectively.

Further, in the above-mentioned rubber desulfurization control device structure, the current monitoring device 5 is a current sensor or a frequency converter.

Further, in the structure of the above-mentioned rubber desulfurization control device, the stirring shaft 2 is arranged in a vertical direction.

Further, in the structure of the control device for rubber desulfurization, the controller 6 is a PLC.

Further, the structure of the above-mentioned rubber desulfurization control device further includes a valve, the valve is arranged at the discharge port of the desulfurization tank 1, and the valve is electrically connected to the controller 6.

Further, in the structure of the control device for rubber desulfurization, the valve is a flapper valve.

Further, in the structure of the above-mentioned rubber desulfurization control device, the desulfurization tank 1 is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller 6.

Example 1

A control method for rubber desulfurization includes the following steps:

Step 2: Obtain the current value of the motor through the current sensor electrically connected to the motor, receive the current value of the motor obtained by the inverter through the PLC, and determine whether the current value of the motor reaches the preset value. If so, the PLC controls the motor shaft to stop rotating, and the PLC The heating device is controlled to stop heating the desulfurization tank 1, and the discharge is controlled to obtain devulcanized rubber.

Example 2

A control method for rubber desulfurization includes the following steps:

Step 2: Obtain the motor current value through the inverter electrically connected to the motor, receive the motor current value obtained by the inverter through the PLC, and determine whether the motor current value reaches the preset value. If so, the PLC controls the motor shaft to stop rotating, and the PLC The heating device is controlled to stop heating the desulfurization tank 1, and the insert valve of the discharge port of the desulfurization tank 1 is controlled to open, so that the rubber is discharged to obtain the devulcanized rubber.

Example 3

A control device for rubber desulfurization includes a desulfurization tank 1, a stirring shaft 2, a heating device, a reducer 3, a driving motor 4, a current monitoring device 5, and a controller 6; the stirring shaft 2 penetrates the stirring tank, and The stirring shaft 2 is in transmission connection with the driving motor 4 through the reducer 3. The current monitoring device 5 is electrically connected to the driving motor 4; the current monitoring device 5 is a current sensor; the controller 6 is connected to the heating device and the driving motor 4 respectively. It is electrically connected to the current monitoring device 5. The stirring shaft 2 is arranged in a vertical direction. The controller 6 is a PLC. It also includes a valve which is arranged at the discharge port of the desulfurization tank 1, and the valve is electrically connected to the controller 6. The valve is a flapper valve. The desulfurization tank 1 is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller 6.

Example 4

A control device for rubber desulfurization according to embodiment 3, wherein the current monitoring device 5 is a frequency converter.

Example 5

Using the rubber desulfurization control method of Example 2 and the rubber desulfurization control device of Example 4, when no material is added in the desulfurization tank 1, the stirring shaft 2 is driven to rotate by the motor, and the motor output is obtained by the inverter The current is 19A;

Put 40kg of waste rubber powder into the desulfurization tank 1, and put the corresponding ingredients into the desulfurization tank 1, then the desulfurization tank 1 is closed, and the inside of the desulfurization tank 1 is heated by the PLC control heating device, and the temperature in the desulfurization tank 1 is kept constant at the preset temperature through the temperature sensor. PLC controls the driving motor 4 to drive the mixing shaft 2 to agitate waste rubber powder, and the working frequency of the driving motor 4 is set to 37 Hz through the frequency converter, so that the rotation speed of the mixing shaft 2 is constant at 152r/min;

If the discharge viscosity is 40 Mooney, the output current value of the motor corresponds to 28A;

If the discharge viscosity is 60 Mooney, the output current value of the motor corresponds to 27A;

The difference between the actual viscosity value and the expected viscosity value of the materials obtained in different batches is always controlled within 0.5-4.5%.

Example 6

Step 2: Obtain the torque value of the motor through the torque sensor 5 connected to the motor shaft, receive the motor torque value obtained by the torque sensor 5 through the PLC, and determine whether the motor torque value reaches the preset value. If so, the PLC controls the motor shaft to stop rotating. At the same time, the PLC controls the heating device to stop heating, and controls the plate valve of the discharge port of the desulfurization tank 1 to open, so that the rubber is discharged, and the devulcanized rubber is obtained.

Example 7

A desulfurization and discharge control device for regenerated rubber, including a desulfurization tank 1, a stirring shaft 2, a heating device, a reducer 3, a driving motor 4, a torque sensor 5, a plug-in valve and a PLC;

The stirring shaft 2 penetrates the stirring tank, the stirring shaft 2 is parallel to the vertical direction, the stirring shaft 2 is drivingly connected to the driving motor 4 through the reducer 3, and the torque sensor 5 is connected to the motor and the reducer 3 In between, the plug-in valve is arranged at the discharge port of the desulfurization tank 1; the PLC is electrically connected to the plug-in valve, the drive motor 4, the temperature sensor and the torque sensor 5, respectively. The desulfurization tank 1 is provided with a temperature sensor, and the temperature sensor is electrically connected to the controller 6.

Example 8

The desulfurization and discharge control device for reclaimed rubber of Example 2 is adopted, and the desulfurization and discharge control method for regenerated rubber of Example 1 is adopted;

When no material is added in the desulfurization tank 1, the motor drives the stirring shaft 2 to rotate, and the measured output torque of the motor is 453.63Nm at this time;

Put 40kg of waste rubber powder into the desulfurization tank 1, and put the corresponding ingredients into the desulfurization tank 1, close the desulfurization tank 1, and use the PLC control heating device to heat the interior of the desulfurization tank 1, and use the temperature sensor to keep the temperature in the desulfurization tank 1 constant at the preset temperature. The drive motor 4 is controlled by PLC to drive the stirring shaft 2 to stir waste rubber powder, and the working frequency of the drive motor 4 is set to 37 Hz through the inverter, so that the speed of the stirring shaft 2 is constant at 152r/min;

If the viscosity of the discharging material is 40 Mooney, the output torque of the motor corresponds to 668.5Nm;

If the viscosity of the discharging material is 60 Mooney, the output torque of the motor corresponds to 644.63Nm;

The difference between the actual viscosity value and the expected viscosity value of the materials obtained in different batches is always controlled within 0.5-1%.

In summary, in the desulfurization and discharge control method for reclaimed rubber provided by the present invention, the viscosity of the waste rubber powder increases continuously during the mixing and heating process of the rubber powder. In order to maintain a constant rotation speed of the stirring shaft, the stirring shaft The torque received by the motor increases, and the torque received by the motor is borne by the motor. Therefore, the torque output by the motor also increases. Therefore, the viscosity of the waste rubber powder is positively related to the torque output by the motor. The viscosity value of devulcanized rubber sets the torque output by the corresponding motor. By monitoring whether the torque value output by the motor reaches the preset value, it is determined whether the waste rubber powder reaches the required viscosity, so as to control the motor and heating device to stop, and Compared with the traditional method of automatic discharging by setting the heating temperature and processing time, the viscosity error of the devulcanized rubber obtained in different batches is greatly reduced, and the error is always controlled at 0.5-1%, which is greatly improved. Improve the quality stability of recycled rubber. Because the viscosity of the waste rubber powder is increasing during the mixing and heating process of the rubber powder, in order to maintain a constant speed of the stirring shaft, the output current of the motor is increasing under the condition of the same voltage. Therefore, the viscosity of the waste rubber powder is The current value output by the motor is positively correlated. The current value output by the corresponding motor can be set according to the viscosity value of the devulcanized rubber that needs to be discharged, and the waste rubber powder can be determined by detecting whether the current value output by the motor reaches the preset value. Whether the required viscosity is reached, so as to control the shutdown and discharging. Compared with the traditional method of automatic discharging by setting the heating temperature and heating time, the viscosity error of the devulcanized rubber obtained from different batches is greatly reduced. , The error is always controlled at 0.5-4.5%, which greatly improves the quality stability of recycled rubber.

The above are only the embodiments of the present invention and do not limit the scope of the present invention. Any equivalent transformations made using the content of the description and drawings of the present invention, or directly or indirectly applied in related technical fields, are included in the same way Within the scope of patent protection of the present invention.

Claims

A desulfurization and discharge control method for reclaimed rubber is characterized in that it comprises the following steps:

Step 1. Put the waste rubber powder into a stirring desulfurization tank with a constant stirring shaft speed and heat and stir to desulfurize the waste rubber powder;

Step 2: Determine whether the viscosity of the rubber reaches the expected viscosity by obtaining the torque of the motor connected to the stirring shaft of the stirred desulfurization tank or by obtaining the current value of the motor connected to the motor driving the stirring shaft of the desulfurization tank. If so, the desulfurization tank Stop heating and stirring, and discharge to obtain devulcanized rubber.
The desulfurization and discharge control method of reclaimed rubber according to claim 1, wherein the step 2 is specifically: obtaining the torque value of the motor through a torque sensor connected to the motor shaft, and receiving the motor torque obtained by the torque sensor through a PLC If it is, the PLC controls the motor shaft to stop rotating, and the PLC controls the heating device to stop heating the desulfurization tank and controls the discharge to obtain the devulcanized rubber.
The desulfurization and discharge control method of reclaimed rubber according to claim 1, wherein the step 2 is specifically: obtaining the torque value of the motor through a torque sensor connected to the motor shaft, and receiving the motor torque obtained by the torque sensor through a PLC Value, to determine whether the motor torque value reaches the preset value, if it is, the PLC controls the motor shaft to stop rotating, and at the same time the PLC controls the heating device to stop heating, and controls the flapper valve at the outlet of the desulfurization tank to open, so that the rubber is discharged and desulfurization is obtained rubber.
The method for controlling rubber desulfurization according to claim 1, wherein the step 2 is specifically: acquiring the current value of the motor through a current sensor electrically connected to the motor, receiving the current value of the motor acquired by the inverter through the PLC, and determining Whether the motor current value reaches the preset value, if it is, the PLC controls the motor shaft to stop rotating, and at the same time, the PLC controls the heating device to stop heating the desulfurization tank and control the discharge to obtain the devulcanized rubber.
A desulfurization and discharge control device for reclaimed rubber, which is characterized by comprising a desulfurization tank, a stirring shaft, a heating device, a reducer, a driving motor, a torque sensor and a controller;

The stirring shaft penetrates the stirring tank, the stirring shaft is connected to the drive motor through a reducer, the torque sensor is connected between the motor and the reducer; the controller is respectively connected to the heating device, the drive motor and the torque sensor Electric connection.
A desulfurization and discharge control device for reclaimed rubber, which is characterized by comprising a desulfurization tank, a stirring shaft, a heating device, a reducer, a driving motor, a current monitoring device and a controller;

The stirring shaft penetrates the stirring tank, the stirring shaft is drivingly connected to a driving motor through a reducer, and the current monitoring device is electrically connected to the driving motor;

The current monitoring device is a device that can monitor the current of the driving motor;

The controller is respectively electrically connected with the heating device, the driving motor and the current monitoring device.
The desulfurization and discharge control device of reclaimed rubber according to claim 6, wherein the current monitoring device is a current sensor or a frequency converter.
The desulfurization and discharge control device for reclaimed rubber according to claim 5 or 6, characterized in that it further comprises a valve arranged at the discharge port of the desulfurization tank, and the valve is electrically connected to the controller.
The desulfurization and discharge control device for reclaimed rubber according to claim 5 or 6, characterized in that the controller is a PLC.
The desulfurization and discharge control device for reclaimed rubber according to claim 5 or 6, wherein the axial direction of the stirring shaft is a vertical direction.