Lubricating oil device for internal mixer

Abstract

A lubricating oil device for an internal mixer comprises a supporting frame, a plurality of plunger pumps arranged on the supporting frame and a plurality of servo driving motors arranged on the supporting frame and connected with the plunger pumps, and a plurality of oil outlets in the plunger pumps are all connected with high-pressure oil outlet pipes. An oil inlet in the plunger pump is connected with an oil inlet pipeline, and one end, far away from the plunger pump, of the oil inlet pipeline is connected with one oil storage barrel or a plurality of oil storage barrels; the end, away from the plunger pump, of the high-pressure oil outlet pipe is sequentially connected with a proportional electric valve, a one-way valve, a pressure sensor and a flow meter. An oil inlet electromagnetic valve is arranged at the top of the oil storage barrel, and an upper stop valve is arranged on the oil inlet electromagnetic valve; an exhaust port is formed in the top of the oil storage barrel; a level gage, a platinum thermal resistor and a heating wire are arranged in the oil storage barrel; and an electromagnetic directional valve and a lower stop valve are arranged at one end, close to the oil storage barrel, of the oil inlet pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of lubrication control, in particular to a lubricating oil device for an internal mixer. Background Art

[0002] In the production process of the internal mixer, the lubricating oil system plays a vital role in ensuring the normal operation of the equipment. Lubricating oil can reduce the friction loss of the mechanical parts and extend the service life of the equipment; it can dissipate heat and cool the components to maintain the normal working temperature; it can play a sealing role to prevent material leakage; it can also carry away metal particles and other tiny impurities generated by the operation of the equipment during the flow process, playing a cleaning role.

[0003] However, the lubricating oil systems currently on the market have the following shortcomings: part of the oil will enter the mixing chamber of the internal mixer and eventually enter the product. Only a single type of oil can be used, which cannot meet the formulation requirements of different rubber products and affect product quality. The temperature rise of the lubrication point cannot be organically combined with the oil injection amount, and different temperature rise trends can only use the same oil injection amount. Under low ambient temperatures, the oil in the oil storage barrel cannot be effectively heated, resulting in reduced lubrication performance or equipment damage. There is a lack of real-time monitoring of lubricating oil consumption, making it difficult for users to accurately grasp usage, which is not conducive to cost control and maintenance plan formulation. The frequency converter is used to adjust the oil pump speed, and the frequency converter speed adjustment response is slow, resulting in poor lubrication effect or waste of lubricating oil. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lubricating oil device for an internal mixer.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A lubricating oil device for an internal mixer comprises a support frame, a plurality of plunger pumps arranged on the support frame, and a plurality of servo drive motors arranged on the support frame and connected to the plurality of plunger pumps, wherein the plurality of oil outlets on the plunger pumps are connected to high-pressure oil outlet pipes, the oil inlet on the plunger pump is connected to an oil inlet pipeline, and the end of the oil inlet pipeline away from the plunger pump is connected to an oil storage barrel or a plurality of oil storage barrels; wherein the end of the high-pressure oil outlet pipe away from the plunger pump is connected in sequence to a proportional electric valve, a one-way valve, a pressure sensor, and a flow meter.

[0007] In one embodiment, a vertical support plate is provided on the support frame, and the oil storage barrel is arranged on the vertical support plate.

[0008] In one embodiment, an oil inlet solenoid valve is provided on the top of the oil storage barrel, and an upper stop valve is provided on the oil inlet solenoid valve.

[0009] In one embodiment, a vent is provided on the top of the oil storage barrel.

[0010] In one embodiment, a level meter, a platinum thermal resistor and a heating wire are provided in the oil storage barrel.

[0011] In one embodiment, an electromagnetic reversing valve and a lower stop valve are provided on one end of the oil inlet pipeline close to the oil storage barrel.

[0012] In one embodiment, an electrical control box is also provided on the vertical support plate, and the electrical control box is electrically connected to the plunger pump, the servo drive motor, the proportional electric valve, the pressure sensor, the flow meter, the oil inlet solenoid valve, the level meter, the platinum thermal resistor, the electromagnetic reversing valve, and the heating wire.

[0013] In one embodiment, a tool box is also provided in the support frame.

[0014] In one embodiment, the electric control box is also provided with an alarm.

[0015] In one embodiment, an oil pan is provided above the tool box and inside the support frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention comprises a support frame, a plurality of plunger pumps arranged on the support frame, and a plurality of servo drive motors arranged on the support frame and connected to the plurality of plunger pumps. The plurality of oil outlets on the plunger pumps are connected to high-pressure oil outlet pipes, the oil inlet on the plunger pump is connected to an oil inlet pipeline, and the end of the oil inlet pipeline away from the plunger pump is connected to an oil storage barrel or a plurality of oil storage barrels; thereby, each plunger pump, a servo drive motor and a high-pressure oil outlet constitute an independent lubrication oil circuit, and independent lubrication work can be carried out according to different process requirements.

[0018] Second, the present invention can adjust the oil injection speed quickly according to different requirements under different load conditions of the internal mixer by setting the servo drive motor;

[0019] 3. The present invention provides a level meter and a platinum thermal resistor in the oil storage barrel; an electromagnetic reversing valve and a lower stop valve are provided on one end of the oil inlet pipeline close to the oil storage barrel; thus, the oil in the oil storage barrel can be heated according to the external ambient temperature to ensure the fluidity of the oil at low temperatures.

[0020] Fourth, the lubricating oil device for internal mixer of the present invention can correspond to different lubrication points respectively, and can independently control each lubrication point according to different equipment working conditions and production needs, aiming to realize effective and economical lubrication treatment of internal mixer equipment under the premise of ensuring production process.

[0021] 5. The lubricating oil device for an internal mixer of the present invention adopts a PID control algorithm for the lubricating oil circuit that supplies oil to the dynamic and static wear-resistant rings at the seal of the internal mixer rotor. According to the temperature rise of different lubrication points, the amount of lubricating oil in each oil pipe branch is adjusted, and the oil injection speed is adjusted based on the production load to achieve the temperature rise of each lubrication point within a reasonable range. For the lubricating oil circuit that supplies oil to the gap between the rotor end face and the wear-resistant retaining ring at the seal of the internal mixer rotor, the type of oil can be flexibly switched according to the process production needs, and the oil injection speed and oil injection amount can be quickly adjusted based on load changes and process needs. Both lubricating oil circuits can heat the oil in the oil storage barrel according to the ambient temperature to ensure the fluidity of the oil at low temperatures. It is connected to the factory's superior system through a network interface to achieve remote automatic control or local control of the internal mixer lubrication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 2 For the present invention Figure 1 A schematic diagram of the front structure of

[0024] Figure 3 For the present invention Figure 1 Schematic diagram of the top view structure.

[0025] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the oil storage barrel.

[0026] In the figure: 10. Support frame, 20. Plunger pump, 30. Servo drive motor, 40. High-pressure oil outlet pipe, 41. Proportional electric valve, 42. Check valve, 43. Pressure sensor, 44. Flow meter, 50. Oil inlet pipeline, 60. Oil storage barrel, 61. Oil inlet solenoid valve, 62. Upper stop valve, 63. Exhaust port, 64. Level meter, 65. Platinum thermal resistor, 66. Solenoid reversing valve, 67. Lower stop valve, 68. Heating wire, 70. Vertical support plate, 80. Electric control box, 81. Tool box, 85. Oil receiving tray. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Example 1

[0029] like Figure 1-4As shown, this embodiment includes a support frame 10, a plurality of plunger pumps 20 arranged on the support frame 10, and a plurality of servo drive motors 30 arranged on the support frame 10 and connected to the plurality of plunger pumps 20; in this embodiment, the plunger pump 20 is a multi-head plunger pump, and there are two plunger pumps 20, each plunger pump 20 is connected to a servo drive motor 30, so that it is connected to the plunger pump 20 through the servo drive motor 30, and can quickly respond to process change requirements.

[0030] The plurality of oil outlets on the plunger pump 20 are all connected to the high-pressure oil outlet pipe 40. In this embodiment, the plunger pump 20 is provided with eight oil outlets, and the eight oil outlets are all connected to the high-pressure oil outlet pipe 40, that is, the eight oil outlets are respectively connected to the eight high-pressure oil outlet pipes 40, thereby forming eight oil pipe branches;

[0031] The end of the high-pressure oil outlet pipe 40 away from the plunger pump 20 is connected in sequence with a proportional electric valve 41, a one-way valve 42, a pressure sensor 43, and a flow meter 44; the pressure sensor 43 and the flow meter 44 on the high-pressure oil outlet pipe 40 can be used to detect the oil volume and oil pressure; the proportional electric valve 41 can automatically adjust the oil volume according to the main control feedback; the one-way valve 42 can ensure that the oil does not flow back when the oil pump is running at a low speed or not running;

[0032] Thus, the two plunger pumps 20 constitute two lubricating oil circuits, and each outlet oil circuit of the two lubricating oil circuits can independently adjust the oil flow, meter the oil consumption, and measure the oil pressure. Each outlet oil circuit is configured identically, and the pipe diameter is DN6 or DN8 stainless steel pipe or copper pipe. The number of outlet oil circuits can be increased or decreased according to different systems.

[0033] The oil inlet on the plunger pump 20 is connected to an oil inlet pipeline 50, and one end of the oil inlet pipeline 50 away from the plunger pump 20 is connected to an oil storage barrel 60 or a plurality of oil storage barrels 60; in this embodiment, the two plunger pumps 20 are respectively connected to one oil storage barrel 60 and two oil storage barrels 60 through the oil inlet pipeline 50, that is, one plunger pump 20 is connected to one oil storage barrel 60, and the other plunger pump 20 is connected to two oil storage barrels 60;

[0034] In this embodiment, two plunger pumps 20 are used, one multi-head plunger pump 20 is used to supply oil to the dynamic and static wear-resistant rings at the rotor seal of the internal mixer, and the other multi-head plunger pump 20 is used to supply oil to the gap between the rotor end face and the wear-resistant retaining ring at the rotor seal of the internal mixer, so as to quickly respond to the signal requirements of the internal mixer control system and quickly adjust the oil injection speed according to changes in production process and equipment operating conditions.

[0035] An oil inlet solenoid valve 61 is provided on the top of the oil storage barrel 60, and an upper stop valve 62 is provided on the oil inlet solenoid valve 61; an exhaust port 63 is provided on the top of the oil storage barrel 60; a material level meter 64, a platinum thermal resistor 65 and a heating wire 68 are provided in the oil storage barrel 60; and an electromagnetic reversing valve 66 and a lower stop valve 67 are provided on one end of the oil inlet pipeline 50 close to the oil storage barrel 60;

[0036] In this embodiment, the platinum thermal resistor 65 and the heating wire 68 can be used to perform heating operations according to the type of oil, ensuring that the oil still has good fluidity when the temperature is low; the level meter 64 and the oil inlet solenoid valve 61 can automatically replenish the oil according to the liquid level; the solenoid reversing valve 66 can automatically switch on and off according to different process recipes.

[0037] Thus, the oil storage barrel 60 is equipped with a material level meter 64, a platinum thermal resistor 65, a heating wire 68, an oil inlet solenoid valve 61 and an electromagnetic reversing valve 66; the oil inlet solenoid valve 61 is connected to an external large oil tank through an oil pipe, and the electromagnetic reversing valve 66 is connected to the plunger pump 20 through an oil inlet pipeline 50; the heating wire 68 and the platinum thermal resistor 65 in the oil storage barrel 60, and the heating wire 68 is distributed in the oil storage barrel 60 in a ring shape and divided into three groups, and the three groups of heating wires 68 correspond to the high liquid level-ultra-high liquid level interval, the high liquid level-medium liquid level interval, and the medium liquid level-low liquid level interval, ensuring that the lubricating oil runs within a suitable temperature range and improving the performance and service life of the lubricating oil. The oil storage barrel 60 is a sealed structure, and when heated, the exhaust hole 63 can discharge excess air.

[0038] A vertical support plate 70 is provided on the support frame 10 , and the oil storage barrel 60 is arranged on the vertical support plate 70 ; in this embodiment, the vertical support plate 70 is a vertical concave vertical plate.

[0039] An electric control box 80 is also provided on the vertical support plate 70, and the electric control box 80 is electrically connected to the plunger pump 20, the servo drive motor 30, the proportional electric valve 41, the pressure sensor 43, the flow meter 44, the oil inlet solenoid valve 61, the material level meter 64, the platinum thermal resistor 65, the electromagnetic reversing valve 66, and the heating wire 68; thereby, the lubricating oil device for the internal mixer is controlled by the electric control box 80.

[0040] In this embodiment, the electric control box 80 includes an intelligent control unit, which can perform relatively complex logic control and has data storage and processing capabilities; it also has a network module and an Ethernet communication function.

[0041] In this embodiment, the electric control box 80 includes a controller, a sensor, an actuator, a human-machine interface, a network interface module, and a switch.

[0042] The electric control box 80 is also provided with an alarm; in the present embodiment, the electric control box 80 is equipped with an alarm unit, which can emit sound and light prompts according to different faults, and the human-machine interface provides relevant document help.

[0043] In addition, a tool box 81 is provided in the support frame 10; an oil receiving pan 85 is provided above the tool box 81 and in the support frame 10; thus, the tool box 81 and the oil receiving pan 85 are provided so that timely maintenance can be performed when the device fails.

[0044] The workflow of the present invention is as follows:

[0045] Before the main engine of the internal mixer is started, the lubricating oil device is started first, and the lubricating oil device self-checks. When the level meter 64 detects that the liquid level is at a low level, the oil inlet solenoid valve 61 is opened, and the external oil pipe guides the external oil into the oil storage barrel 60. After the liquid level reaches the high level, the oil inlet solenoid valve 61 is closed. If the oil level does not rise for a long time after the oil inlet solenoid valve 61 is opened, or the liquid level continues to rise after reaching the high level, the electric control box 80 will automatically alarm and feed back the relevant fault signal to the superior control system. When the liquid level continues to drop after the oil inlet solenoid valve 61 is opened, the system will send an alarm signal. When the liquid level reaches the low level, the main engine of the internal mixer will be stopped or not allowed to start. The oil storage barrel 61 is connected to the plunger pump 20 through the oil inlet pipe 50. The plunger pump 20 supplies oil to the lubricating oil circuit of the gap between the rotor end face and the wear-resistant retaining ring at the rotor seal of the internal mixer through the high-pressure oil outlet pipe 40, and through the proportional solenoid valve 41 on the high-pressure oil outlet pipe 40, the solenoid reversing valve under the corresponding oil storage barrel 60 is connected based on rubber products of different specifications or types.

[0046] When the ambient temperature is too low, the fluidity of the oil in the oil storage barrel 61 is poor, which will affect the lubrication effect and the service life of the plunger pump 20. At low temperatures, the heating wire 68 of the oil storage barrel 61 is started to heat the oil in the oil storage barrel 61. The heating wire 68 is controlled by a solid-state relay. When the oil temperature approaches the set temperature, the PLC will perform PID control on the heating power. As the temperature gradually approaches, the output voltage of the solid-state relay decreases, and the output power of the heating wire 68 decreases. As the liquid level changes, the corresponding group of heating wires 68 is started or stopped.

[0047] After the lubricating oil device is started, the PLC controller matches the temperature sensor feedback of each lubrication point based on the load size of the internal mixer main machine; when the internal mixer is unloaded, the lubrication circuit used to supply oil to the dynamic and static wear-resistant rings at the internal mixer rotor seal will adjust the proportional electric valve 41 on the corresponding high-pressure oil outlet pipe 40 to a smaller opening to reduce the oil output when the temperature rise trend of the lubrication point is too slow; when the temperature rise trend of the lubrication point is too fast, the proportional electric valve 41 on the corresponding high-pressure oil outlet pipe 40 will be adjusted to a larger opening to increase the oil output and maintain the temperature rise of each point to a relatively balanced point. The lubrication circuit used to supply oil to the gap between the rotor end face and the wear-resistant retaining ring at the internal mixer rotor seal is in a slow oil supply or the servo drive is only in an enabled state, and the proportional electric valve 41 of each oil branch circuit is at a smaller opening, and no PID control is put into operation.

[0048] At the beginning of feeding, as the rubber is added, the rubber will exert a greater pressure on the dynamic and static wear-resistant rings of the rotor seal of the internal mixer. The lubrication circuit used to supply oil to the dynamic and static wear-resistant rings of the rotor seal of the internal mixer, the oil pump speed is adjusted according to the load change, and the PID parameters of the proportional valves of each oil circuit will enter another mode relative to the no-load adjustment. After discharging, this lubrication circuit returns to the no-load working state and waits for the next feeding. The lubrication circuit used to supply oil to the gap between the rotor end face and the wear-resistant retaining ring at the rotor seal of the internal mixer, as the feeding starts, each oil circuit enters PID control, and the servo driver follows the load size and the pressure lump position to PID control the oil pump speed. After discharging, this lubrication circuit will continue to work in the previous stage for a period of time, and then enter the no-load state, waiting for the next feeding.

[0049] The one-way valve 42 on each high-pressure oil outlet pipe 40 prevents the backflow of oil when the oil pump is at a low speed or stopped, and the proportional valve electric 41 adjusts the amount of oil output; the flow meter 44 measures the amount of oil output, transmits the data to the PLC controller, and measures the oil; in order to ensure that the oil can reach each lubrication point smoothly, the pressure sensor 41 detects the high-pressure oil outlet pipe 40. When the oil pressure is lower than 3MPa, the high-pressure oil outlet pipe 40 leaks. When the detected pressure is greater than 60MPa, the high-pressure oil outlet pipe 40 is blocked, and the PLC controller will issue relevant alarms and information prompts.

[0050] The control unit of the device is installed in the electric control box 80, including a controller, a sensor, an actuator, a human-machine interface, a network interface module, and a switch. The controller adopts PLC, which has powerful data processing and control functions. It collects various sensor signals, and automatically adjusts the system operation status according to the preset program algorithm based on the collected oil temperature, oil pressure, oil volume, liquid level and mixer control system signals, such as adjusting the speed of the servo motor 30, the working power of the heating wire 68, opening the corresponding formula oil storage barrel 60, the oil inlet solenoid valve 61, etc. The actuator includes a servo driver, a solid-state relay, an intermediate relay, etc., which are used to execute the instructions of the controller to realize the intelligent control of the system.

[0051] The human-machine interface can control the lubrication system and provide the function of displaying the system operation status and parameters (such as temperature, pressure, oil consumption, etc.), so that users can understand the system operation status in real time, and can also display various alarms and related help information in detail. The network interface module and switch are connected to the internal mixer control system to cooperate with the requirements of the internal mixer main control system in real time.

[0052] At the same time, the novel intelligent and efficient lubricating oil system of the present invention is also provided with an alarm unit, which sends out an audible and visual alarm signal when an abnormality occurs in the system to remind the user to pay attention and handle it in time.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the technical solutions of the present invention have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lubricating oil device for an internal mixer, characterized in that: The invention comprises a support frame (10), a plurality of plunger pumps (20) arranged on the support frame (10), and a plurality of servo drive motors (30) arranged on the support frame (10) and connected to the plurality of plunger pumps (20), wherein the plurality of oil outlets on the plunger pump (20) are all connected to a high-pressure oil outlet pipe (40), the oil inlet on the plunger pump (20) is connected to an oil inlet pipeline (50), and the end of the oil inlet pipeline (50) away from the plunger pump (20) is connected to an oil storage barrel (60) or a plurality of oil storage barrels (60); wherein the end of the high-pressure oil outlet pipe (40) away from the plunger pump (20) is sequentially connected to a proportional electric valve (41), a one-way valve (42), a pressure sensor (43), and a flow meter (44).

2. The lubricating oil device for internal mixer according to claim 1, characterized in that: The support frame (10) is provided with a vertical support plate (70), and the oil storage barrel (60) is arranged on the vertical support plate (70).

3. The lubricating oil device for internal mixer according to claim 2, characterized in that: An oil inlet solenoid valve (61) is provided on the top of the oil storage barrel (60), and an upper stop valve (62) is provided on the oil inlet solenoid valve (61).

4. The lubricating oil device for internal mixer according to claim 3, characterized in that: The top of the oil storage barrel (60) is provided with an exhaust port (63).

5. The lubricating oil device for internal mixer according to claim 4, characterized in that: The oil storage barrel (60) is provided with a material level meter (64), a platinum thermal resistor (65) and a heating wire (68).

6. The lubricating oil device for internal mixer according to claim 5, characterized in that: An electromagnetic reversing valve (66) and a lower stop valve (67) are provided on one end of the oil inlet pipeline (50) close to the oil storage barrel (60).

7. The lubricating oil device for internal mixer according to claim 6, characterized in that: An electric control box (80) is also provided on the vertical support plate (70), and the electric control box (80) is electrically connected to the plunger pump (20), the servo drive motor (30), the proportional electric valve (41), the pressure sensor (43), the flow meter (44), the oil inlet solenoid valve (61), the material level meter (64), the platinum thermal resistor (65), the electromagnetic reversing valve (66), and the heating wire (68).

8. The lubricating oil device for internal mixer according to claim 7, characterized in that: A tool box (81) is also provided inside the support frame (10).

9. The lubricating oil device for internal mixer according to claim 8, characterized in that: The electric control box (80) is also provided with an alarm.

10. The lubricating oil device for internal mixer according to claim 9, characterized in that: An oil receiving pan (85) is provided above the tool box (81) and inside the support frame (10).

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