A pretreatment device for continuous extraction of essential oils

Abstract

A pretreatment device for continuous extraction of essential oils, including a power regulator, an electric push rod, a solenoid valve, a frame, a support platform, a filter box, a liquid level switch, an air compressor, a motor reduction mechanism, a stirring and crushing rod, an upper tank body, a liquid tank, a sealing plate, and a bearing seat; it also has a liquid level prompt circuit, and the power regulator, the electric push rod, the solenoid valve, the frame, the support platform, the filter box, the liquid level switch, the air compressor, the motor reduction mechanism, the stirring and crushing rod, the upper tank body, the liquid tank, the sealing plate, and the bearing seat are installed together. The new device can stir and clean the raw materials, and after the extraction liquid is introduced after cleaning, it can crush the raw materials. After the compressed air is introduced, the filtering effect can be improved. When the filtered liquid is blocked, the buzzer can remind the staff to clean the filter box. The new device can complete the raw material cleaning, crushing and filtering processes through simple operations. The overall structure of the equipment is more compact and more convenient to use, which correspondingly improves the work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of extraction devices, in particular to a pretreatment device for continuously extracting essential oils. Background Art

[0002] Distillation extraction is a common method for extracting essential oils from plants. It is suitable for dried flowers, leaves, stems, roots, fruits and other plant materials. The basic principle is to put the plant material into the distiller, clean and crush the raw material with water, etc., and then put it into the distillation extraction tank with the extraction liquid (water is also a kind of extraction liquid). The raw material is heated in the tank. After heating and evaporation, the liquid takes away the effective ingredients in the raw material and then outputs it to the condensation equipment. The gas with the effective ingredients of the essential oil is condensed into liquid and collected in the semi-finished product tank. Finally, the essential oil components and the extraction liquid are separated by the separation equipment to obtain the finished essential oil product.

[0003] Although the existing essential oil distillation and extraction equipment meets the production needs to a certain extent, the cleaning, crushing, filtering, etc. of the raw materials in the early stage are generally carried out by cleaning equipment, crushing equipment, and filtering equipment respectively. In this way, the number of equipment is relatively large, the structure is not compact, the cost is relatively high, and it also occupies more installation space on site. In addition, the staff puts the raw materials into the cleaning equipment for cleaning, then takes them out and puts them into the crushing equipment, and finally filters them through the filtering equipment. The relative operation process is relatively cumbersome, which brings inconvenience to the staff and is not conducive to improving work efficiency. In summary, it is particularly necessary to provide a pretreatment equipment for extracting essential oils that can simultaneously complete cleaning, crushing, and filtering. Utility Model Content

[0004] In order to overcome the drawbacks of the existing essential oil distillation and extraction equipment as described in the background technology due to structural limitations, the present invention provides a pretreatment device for continuous extraction of essential oils, which has a more compact overall structure, is more convenient to use, and correspondingly improves work efficiency. After the workers put the raw materials into the upper tank body under the joint action of relevant mechanisms, the raw materials can be cleaned, crushed and filtered by simply operating the power switch. The processed raw materials directly enter the distillation and extraction tank for extraction.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A pretreatment device for continuous extraction of essential oils, comprising a power regulator, an electric push rod, an electromagnetic valve, a frame, a support platform, a filter box, a liquid level switch, an air compressor, a motor reduction mechanism, a stirring and crushing rod, an upper tank body, a liquid tank, a sealing plate, and a bearing seat; characterized in that it also has a liquid level prompt circuit, the lower end of the support platform is mounted on the front lower end of the frame, there are multiple sets of electric push rods, the upper ends of the multiple sets of electric push rods are respectively mounted on the front upper end of the frame, and the lower ends of the multiple sets of electric push rods are respectively mounted on the upper end of the sealing plate; the lower end of the liquid tank is mounted on the support platform, the upper end of the upper tank body is an open structure, the bearing seat is mounted on the lower end of the upper tank body, the motor reduction mechanism is mounted on the outside of the upper end of the sealing plate and its rotating shaft is located at the lower end of the sealing plate; the upper end of the stirring and crushing rod is mounted on the lower end of the rotating shaft, after the lower end of the sealing plate contacts the upper end of the upper tank body, the lower end of the stirring and crushing rod is located in the inner ring of the bearing seat, and the outer end of the stirring and crushing rod is distributed with multiple stirring and crushing pieces; there are multiple electromagnetic valves, one side of the upper tank body Three connection points at the upper end, one connection point at the lower end of one side, and two connection points at the lower end are respectively connected to one end of the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve. The other ends of the first solenoid valve, the second solenoid valve, and the third solenoid valve are respectively connected to one exhaust pipe of the air storage tank of the air compressor, the liquid outlet pipe at the lower end of the extraction liquid box, and the tap water pipe. The other end of the fourth solenoid valve is connected to the sewage tank; at least two liquid pipes are installed at the upper end of the liquid tank, and the upper ends of the two liquid pipes are respectively connected to the other ends of the fifth solenoid valve and the sixth solenoid valve; the lower side of one end of the liquid tank is connected to one end of the seventh solenoid valve, and the other end of the seventh solenoid valve is connected to the liquid inlet pipe of the distillation extraction tank; the liquid level switch is installed in the lower part of the liquid tank, and the filter box is installed in the upper end of the liquid tank; the power regulator and the liquid level prompt circuit are installed in the electric control box, and the power output end of the power regulator is electrically connected to the power input end of the motor reduction mechanism.

[0007] Furthermore, the solenoid valve is a normally closed valve core solenoid valve.

[0008] Furthermore, a sealing rubber ring is installed on the upper end of the upper tank body, and the outer diameter of the upper end of the upper tank body is smaller than the outer diameter of the sealing plate.

[0009] Furthermore, the float of the liquid level switch is spaced from the lower side of the liquid tank, and the liquid tank is a closed structure.

[0010] Furthermore, the liquid level prompt circuit includes an electrically connected relay and resistor, a transistor, and a buzzer, the positive power input terminal of the relay is connected to the control power input terminal, one end of the resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay, the emitter of the transistor is connected to the negative power input terminal of the buzzer, and the normally open contact terminal of the relay is connected to the positive power input terminal of the buzzer.

[0011] Furthermore, a filter plate is installed at the upper end of the liquid tank, an upper end of one side of the liquid tank has an opening, the upper end of the filter box is an open structure and has a plurality of filter holes, the outer size of the filter box is smaller than the inner diameter of the opening, and the lateral length is smaller than the lateral spacing in the liquid tank.

[0012] Furthermore, a sealing plate A is installed on the outside of the filter box, the filter box is inserted into the upper end of the liquid tank through the opening, the lower end of the filter box contacts the upper end of the filter plate, and the sealing plate A and the side opening of the liquid tank are installed together through threads.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) In the application of the present invention, after the staff puts the raw materials into the upper tank body, and then closes the upper tank body through the sealing plate and the electric push rod and adds water, the power output from the power regulator to the motor reduction mechanism is adjusted to a relatively low mode, and the motor reduction mechanism drives the stirring and crushing rod to rotate at a relatively slow speed, which has a stirring and cleaning effect on the raw materials. After the subsequent cleaning is completed, after the extraction liquid is introduced, the power output from the power regulator to the motor reduction mechanism is adjusted to a relatively high mode, and the motor reduction mechanism drives the stirring and crushing rod to rotate at a relatively fast speed, which can crush the raw materials; (2) After crushing, the raw materials are filtered through the filter box and enter the next process. The introduction of compressed air as needed can improve the filtering effect. In extreme cases, when the filtered liquid is blocked and the liquid level in the liquid tank becomes low, the buzzer can promptly remind the staff to clean the filter box. Through the above technical scheme, after the staff of the new type puts the raw materials into the upper tank body, they can complete the cleaning, crushing and filtering processes of the raw materials through a simple power switch operation. The processed raw materials directly enter the distillation extraction tank for extraction. The overall structure of the equipment is more compact and more convenient to use, which correspondingly improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a partial enlarged structural schematic diagram of the utility model.

[0017] Figure 3 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0018] Figure 1 , 2As shown in , 3, a pretreatment device for continuous extraction of essential oils, including a power module A2, a power regulator A1, an electric push rod M1, a solenoid valve, a "]"-shaped frame 1, a support table 2, a filter box 3, a liquid level switch S1, an air compressor (not shown in the figure), a motor reduction mechanism M, a stirring and crushing rod 4, an upper tank body 5, a liquid tank 6, a sealing plate 7, a power switch, and a bearing seat 9; it also has a liquid level prompt circuit 8, the lower end of the support table 2 is welded to the front lower end of the frame 1, and the electric push rod M1 has four sets. The upper ends of the cylinders of the four sets of electric push rods M1 are respectively bolted to the front four sides of the upper end of the frame 1, and the lower ends of the push columns of the four sets of electric push rods M1 are respectively bolted to the four sides of the upper end of the sealing plate 7; the lower end of the liquid tank 6 is bolted to the support table 2, the upper end of the upper tank body 5 is an open structure, the middle part of the inner lower end of the upper tank body 5 is higher than the height around the inner lower end, the middle part of the lower end of the bearing seat 9 is bolted to the middle part of the inner lower end of the upper tank body 5, and the middle part of the sealing plate 7 has an opening, the motor reduction mechanism M seal is bolted to the outside of the upper end of the sealing plate 7, and the rotating shaft of the motor reduction mechanism M (the outer diameter is smaller than the inner diameter of the opening and is located in the opening) is located at the lower end of the sealing plate 7; the upper end of the stirring and crushing rod 4 is welded to the lower end of the rotating shaft, and after the lower end of the sealing plate 7 contacts the upper end of the upper tank body 5, the lower end of the stirring and crushing rod 4 is sleeved in the inner ring of the bearing seat 9, and the outer end of the stirring and crushing rod 4 is welded with a plurality of stirring and crushing pieces 41 distributed in an annular manner from top to bottom at a certain distance; there are seven solenoid valves, and the upper tank body 5 A connecting pipe is welded to the upper middle part of the right end, the lower middle part of the left end, and the left and right sides of the lower side end respectively. The outside of the three connecting pipes in the upper middle part of the right end of the upper tank body, the outside of the one connecting pipe in the lower middle part of the left end, and the lower ends of the two connecting pipes on the left and right sides of the lower side end are respectively connected to one end of the first solenoid valve DC1, the second solenoid valve DC2, the third solenoid valve DC3, the fourth solenoid valve DC4, the fifth solenoid valve DC5, and the sixth solenoid valve DC6 through threads. The other ends of the first solenoid valve DC1, the second solenoid valve DC2, and the third solenoid valve DC3 are connected to one of the exhaust pipes of the air storage tank of the air compressor, the liquid outlet pipe at the lower end of the extraction liquid box (not shown in the figure) located at a high place, and the tap water pipe through pipelines. The other end of the fourth solenoid valve DC4 The liquid tank 6 is connected to the water inlet pipe of the sewage tank (not shown in the figure) through a pipeline; a liquid pipe 61 communicating with the inside is welded to the outside of the middle part of the upper end of the liquid tank, and the upper ends of the two liquid pipes 61 are connected to the other ends of the fifth solenoid valve DC5 and the sixth solenoid valve DC6 through threads; a connecting pipe communicating with the inside is welded to the lower right side of the liquid tank 6, and the connecting pipe in the lower right side of the liquid tank is connected to one end of the seventh solenoid valve DC7 through threads, and the other end of the seventh solenoid valve DC7 is connected to the liquid inlet pipe of the distillation extraction tank (not shown in the figure) located at a lower position through a pipeline; the liquid level switch S1 is installed in the lower right part of the liquid tank 6 (the bottom of the float interval is 2 cm), and the filter box 3 is installed in the upper end of the liquid tank 6 (not shown in the figure);The power module A2, power regulator A1, liquid level prompt circuit 8, and power switch are installed in the electric control box 10, and the electric control box 10 is installed on the outer side of the front middle part of the support platform 2. ;

[0019] Figure 1 , 2 As shown in , 3, the solenoid valve is a normally closed valve core solenoid valve. An annular hollow sealing rubber ring 11 is glued to the upper end of the upper tank body, and the outer diameter of the upper end of the upper tank body 5 is smaller than the outer diameter of the sealing plate 7. The float of the liquid level switch S1 is spaced from the lower side of the liquid tank, and the upper and lower ends of the liquid tank 6 are closed structures. The liquid level prompt circuit includes a relay K1 and a resistor R1, a transistor Q1, and a buzzer B connected by circuit board wiring. The positive power input end of the relay K1 is connected to the control power input end, one end of the resistor R1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the negative power input end of the relay K1, the emitter of the transistor Q1 is connected to the negative power input end of the buzzer B, and the normally open contact end of the relay K1 is connected to the positive power input end of the buzzer B. A partition plate 62 with a plurality of filter holes is welded to the upper end of the liquid tank. A rectangular opening 63 is provided in the middle of the upper left side of the liquid tank 6. A fixing thread hole 64 is provided on the outer side of the opening 63. The upper end of the filter box 3 is an open structure. The front and rear ends and the lower end of the filter box 3 are provided with a plurality of filter holes 31. The outer dimensions of the filter box 3 are smaller than the inner diameter of the opening 63, and the transverse length is slightly smaller than the transverse spacing in the liquid tank 6. A sealing plate A32 with an outer diameter larger than the outer diameter of the left side of the filter box is welded to the left side of the filter box. A rectangular hollow sealing rubber pad is sleeved on the inner side of the sealing plate A32. The side ends of the sealing plate A are provided with a fixing hole. The filter box 3 is inserted into the upper end of the liquid tank 6 through the opening 63. The lower end of the filter box 3 contacts the upper end of the partition plate 62. A plurality of bolts 12 are screwed into the thread holes 64 around the left opening of the liquid tank through the plurality of fixing holes of the sealing plate A, and the filter box 3 and the left side of the liquid tank 6 are sealed and installed together.

[0020] Figure 1 , 2As shown in 3, the power input terminals 1 and 2 of the power module A2, the power input terminals 1 and 2 of the power regulator A1 and the two poles of the AC 220V power supply are connected through wires, the power output terminals 3 and 4 of the power regulator A1 and the power input terminal of the motor reduction mechanism M are connected through wires, the power output terminals 3 and 4 of the power module A2 and one end of the eight power switches (pins 1 and 2 of the power switch S2), one end of the liquid level switch S1, the power input terminal of the liquid level prompt circuit, the positive power input terminal of the relay K1 and the emitter of the transistor Q1 are connected through wires. The other end of the signal input terminal resistor R1 of the liquid level prompt circuit and the signal output terminal (the other end) of the liquid level switch S1 are connected through wires. The power output terminals 3, 4, 5, 6 of one of the power switches S2 are connected to the positive and negative and negative and positive and negative power input terminals of the electric push rod M1 via wires respectively, and the power output terminals of the other seven power switches SN and the negative power output terminal 4 of the power module A1 are connected to the power input terminals of the seven solenoid valves DC1, DC2, DC3, DC4, DC5, DC6, and DC7 via wires respectively.

[0021] Figure 1 , 2As shown in Figure 3, after the AC 220V power supply enters the power input end of the power module A2, the power output end 3 and 4 of the power module A2 outputs a stable DC 24V power supply and enters the power input end of the eight power switches and the liquid level switch and the liquid level prompt circuit. After the staff member turns the handle of the power switch S2 to the left, the 1 and 2 pins and the 3 and 4 pins of the power switch S2 are connected respectively, so that the positive and negative power input ends of the four sets of electric push rods are powered, and the push columns of the four sets of electric push rods drive the sealing plate 7 upward and the upper end of the upper tank body 5 to be separated by a distance, and the power switch S2 is turned off after it is in place. Then the staff member puts the raw materials (flowers, leaves, stems, roots, fruits, etc.) into the upper tank body 5, and then the staff member turns the handle of the power switch S2 to the right, and the 1 and 2 pins and the 5 and 6 pins of the power switch S2 are connected respectively, so that the negative and positive power input ends of the four sets of electric push rods are powered, and the push columns of the four sets of electric push rods push the sealing plate 7 downward and contact the upper end of the upper tank body 5, and the power switch S2 is turned off after it is in place. Then the staff turns on the power switch SN corresponding to the solenoid valve DC3, the electric valve core of the solenoid valve DC3 opens, and tap water enters the upper tank body 5. After the water is full (usually 90 seconds), the power switch is turned off. Then the staff adjusts the knob of the power regulator A1 to make its output voltage the lowest, so that the shaft of the motor reduction mechanism M drives the stirring and crushing rod 4 to rotate at the lowest speed (for example, about 20 turns per minute). Since the speed of the stirring and crushing rod 4 is very low, it will play a cleaning role on the raw materials. Subsequently (about 2 minutes), the staff turns on the power switch SN corresponding to the solenoid valve DC4, so that the waste water washing the raw materials will be discharged into the sewage pool. After the discharge is completed, the staff turns off the power switch. The above cleaning process can be performed multiple times to achieve a better raw material cleaning effect. After cleaning, the staff turns on the power switch SN corresponding to the second solenoid valve DC2, and the electric valve core of the solenoid valve DC2 opens, so that the extraction liquid enters the upper tank body 5. After the extraction liquid is full (usually 90 seconds), the power switch is turned off. Then the staff adjusts the knob of the power regulator A1 to make its output voltage the highest, so that the rotating shaft of the motor reduction mechanism M drives the stirring and crushing rod 4 to rotate at the fastest speed (for example, about 420 revolutions per minute). Since the stirring and crushing rod 4 rotates very fast, it will crush the raw materials. After about 5 minutes, the staff turns off the power switch of the motor reduction mechanism M, and then turns on the power switches of the solenoid valves DC5, DC6, and DC7. The electric valve cores of the solenoid valves DC5, DC, and DC76 are opened, and the crushed raw materials and solvents flow into the filter box 3, and then the filtered liquid raw materials enter the liquid inlet pipe of the distillation extraction tank. After the liquid is filtered and flows out, all power switches are turned off.

[0022] Figure 1 , 2As shown in Figure 3, when the effect of the filter box 3 is not good and the outflowing liquid flow rate is relatively slow, the staff can turn on the power switch of the solenoid valve DC1, so that the high-compressed air output by the air compressor (to improve the efficiency of the liquid flowing downward from the filter hole of the filter box 3) enters the filter box 3, and then drives the liquid at the upper end of the filter box into the liquid tank. In actual situations, when the liquid can be filtered normally into the filter box 3 and flows out through the liquid tank, the liquid level in the liquid tank is also relatively high (the outflow speed of the liquid tank is normally slower than the filtered liquid), the float of the liquid level switch S1 floats up and its two internal contacts are open (the wire connected to the liquid level switch S1 is led out through the opening at the right end of the liquid tank, and the opening is sealed with sealant), then the buzzer B does not sound, which means that the filter hole of the filter box is not blocked and is in a normal liquid filtering state. When there are too many crushed raw materials, the crushed raw materials block the filter holes of the filter box, and the liquid flows out of the liquid tank with little flow, the liquid level in the liquid tank decreases, the float of the liquid level switch S1 no longer floats up, and the two contacts inside it are closed. In this way, the 24V power supply will enter the base of the transistor Q1 through the liquid level switch S1 and the resistor R1 to reduce the voltage and limit the current. The transistor Q1 is turned on and the collector outputs a low level and enters the negative power input terminal of the buzzer B. The buzzer B is powered and sounds, indicating that the filter holes of the filter box are blocked and are no longer in a normal liquid filtering state. The subsequent staff turns off the power switch, unscrews multiple bolts 12, and then pulls out the filter box to the left to dump out the raw material residue inside, cleans it, and then reinstalls the filter box to its original position. After fixing the bolts, it can be used again. Through the above, the new type can not only stir and clean the raw materials, but also crush the raw materials; and compressed air can be introduced as needed to improve the filtering effect. When the filtered liquid is blocked and the liquid level in the liquid tank becomes low, the buzzer can promptly remind the staff to clean the filter box (in actual circumstances, after the liquid is filtered, that is, when the staff observes that the amount of liquid in the distillation extraction tank meets a certain level, the buzzer sounds to indicate that normal filtration is completed). The overall structure of the equipment is more compact and more convenient to use, which correspondingly improves work efficiency.

[0023] Figure 3 As shown, the solenoid valves DC1, DC2, DC3, DC4, and DC7 are 2W normally closed valve core solenoid valves, and the solenoid valves DC5 and DC6 are 5W normally closed valve core solenoid valves; the transistor Q1 is a 9013 NPN transistor; the resistance of the resistor R1 is 1K; the buzzer B is a model FM24V active continuous sound buzzer alarm finished product; the power module A1 is an AC 220V to DC 24V power module; the motor reduction mechanism M is a 2KW coaxial motor gear reducer finished product; the power regulator A1 is a 4000W thyristor high-power 220V AC electronic speed and voltage regulator module; the electric push rod is a 50W electric telescopic rod finished product; the relay K1 model is DC24V; the liquid level switch S1 is a stainless steel float type normally closed liquid level switch finished product.

[0024] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the utility model.

[0025] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A pretreatment device for continuous extraction of essential oils, comprising a power regulator, an electric push rod, a solenoid valve, a frame, a support platform, a filter box, a liquid level switch, an air compressor, a motor reduction mechanism, a stirring and crushing rod, an upper tank body, a liquid tank, a sealing plate, and a bearing seat; characterized in that: The invention also comprises a liquid level prompt circuit, wherein the lower end of the support platform is installed at the front lower end of the frame, and there are multiple sets of electric push rods, the upper ends of the multiple sets of electric push rods are respectively installed at the front upper end of the frame, and the lower ends of the multiple sets of electric push rods are respectively installed at the upper end of the sealing plate; the lower end of the liquid tank is installed at the support platform, the upper end of the upper tank body is an open structure, the bearing seat is installed at the inner lower end of the upper tank body, the motor reduction mechanism is installed outside the upper end of the sealing plate and its rotating shaft is located at the lower end of the sealing plate; the upper end of the stirring and crushing rod is installed at the lower end of the rotating shaft, and after the lower end of the sealing plate contacts the upper end of the upper tank body, the lower end of the stirring and crushing rod is located in the inner ring of the bearing of the bearing seat, and multiple stirring and crushing pieces are distributed at the outer end of the stirring and crushing rod; there are multiple solenoid valves, three connection points at the upper end of one side of the upper tank body, one connection point at the lower end of one side, two connection points at the lower end and the first solenoid valve, the second solenoid valve, and the third solenoid valve. One end of the magnetic valve, the fourth solenoid valve, the fifth solenoid valve and the sixth solenoid valve are connected respectively, the other ends of the first solenoid valve, the second solenoid valve and the third solenoid valve are connected to one of the exhaust pipes of the air storage tank of the air compressor, the liquid outlet pipe at the lower end of the extraction liquid box and the tap water pipe respectively, and the other end of the fourth solenoid valve is connected to the sewage tank; at least two liquid pipes are installed at the upper end of the liquid tank, and the upper ends of the two liquid pipes are connected to the other ends of the fifth solenoid valve and the sixth solenoid valve respectively; the lower side of one end of the liquid tank is connected to one end of the seventh solenoid valve, and the other end of the seventh solenoid valve is connected to the liquid inlet pipe of the distillation extraction tank; the liquid level switch is installed in the lower part of the liquid tank, and the filter box is installed in the upper end of the liquid tank; the power regulator and the liquid level prompt circuit are installed in the electric control box, and the power output end of the power regulator is electrically connected to the power input end of the motor reduction mechanism.

2. A pretreatment device for continuous extraction of essential oils according to claim 1, characterized in that: The solenoid valve is a normally closed spool solenoid valve.

3. A pretreatment device for continuous extraction of essential oils according to claim 1, characterized in that: A sealing rubber ring is installed at the upper end of the upper tank body, and the outer diameter of the upper end of the upper tank body is smaller than the outer diameter of the sealing plate.

4. A pretreatment device for continuous extraction of essential oils according to claim 1, characterized in that: The float of the liquid level switch is spaced from the lower side of the liquid tank, and the liquid tank is a closed structure.

5. A pretreatment device for continuous extraction of essential oils according to claim 1, characterized in that: The liquid level prompt circuit includes an electrically connected relay and resistor, a transistor, and a buzzer. The positive power input terminal of the relay is connected to the control power input terminal, one end of the resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay, the emitter of the transistor is connected to the negative power input terminal of the buzzer, and the normally open contact terminal of the relay is connected to the positive power input terminal of the buzzer.

6. A pretreatment device for continuous extraction of essential oils according to claim 1, characterized in that: A filter plate is installed at the upper end of the liquid tank, an upper end of one side of the liquid tank has an opening, the upper end of the filter box is an open structure with a plurality of filter holes, the outer size of the filter box is smaller than the inner diameter of the opening, and the lateral length is smaller than the lateral spacing in the liquid tank.

7. A pretreatment device for continuous extraction of essential oils according to claim 6, characterized in that: A sealing plate A is installed on the outside of the filter box. The filter box is inserted into the upper end of the liquid tank through the opening. The lower end of the filter box contacts the upper end of the filter plate. The sealing plate A and the side opening of the liquid tank are installed together through threads.

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