Castor oil squeezing device

Abstract

The invention belongs to the technical field of castor oil squeezing processing, and discloses a castor oil squeezing device which comprises an oil squeezing mechanism, an oil filtering mechanism and a residue returning mechanism. The oil pressing mechanism comprises a spiral oil pressing box and a heating box communicated with a feeding port in the top of the spiral oil pressing box. An oil pressing cavity and a residue discharging cavity which are communicated through a center channel are formed in the spiral oil pressing box, and the inner diameter of the oil pressing cavity and the inner diameter of the residue discharging cavity are both larger than the inner diameter of the center channel. A rotatable oil pressing screw rod is arranged in the oil pressing cavity, a rotatable residue discharging stirring rod is arranged in the residue discharging cavity, and the oil pressing screw rod and the residue discharging stirring rod are coaxially fixed; the feeding port communicates with the top of the oil pressing cavity, an oil outlet communicating with the oil filtering mechanism is formed in the bottom of the oil pressing cavity, and a residue discharging port is formed in the bottom of the residue discharging cavity. The top of the heating box is provided with a feeding port communicated with the slag returning mechanism, the bottom of the heating box is provided with a material guiding channel communicated with the feeding port, and at least two sets of material distributing devices are arranged in the heating box from top to bottom.

Description

Technical Field

[0001] The present invention belongs to the technical field of castor oil pressing and processing, and particularly relates to a castor oil pressing device. Background Art

[0002] Castor oil is a triglyceride of fatty acids and exists in castor seeds. During the existing pressing process of castor oil, the castor seeds are usually pre-steamed and stir-fried to improve the oil pressing effect by increasing the temperature of the castor seeds. However, due to the limited oil pressing speed of the existing screw oil press, the temperature of the steamed and stir-fried castor seeds will gradually decrease during the waiting process for feeding, which will cause the problem of inconsistent oil pressing temperatures before and after, affecting the oil pressing effect. Summary of the Invention

[0003] In view of this, to solve the problems raised in the above background art, the purpose of the present invention is to provide a castor oil pressing device to solve the existing problems.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A castor oil pressing device includes an oil pressing mechanism, an oil filtering mechanism, and a slag returning mechanism that are circularly connected. The oil pressing mechanism includes a screw oil pressing tank and a heating tank connected to the feeding port at the top of the screw oil pressing tank. An oil pressing cavity and a slag discharging cavity are provided in the screw oil pressing tank and are connected through a central channel. The inner diameters of both the oil pressing cavity and the slag discharging cavity are larger than the inner diameter of the central channel. A rotatable oil pressing screw is provided in the oil pressing cavity, and a rotatable slag discharging stirring rod is provided in the slag discharging cavity. The oil pressing screw and the slag discharging stirring rod are coaxially fixed. The feeding port is connected to the top of the oil pressing cavity, and an oil outlet connected to the oil filtering mechanism is provided at the bottom of the oil pressing cavity, and a slag discharging port is provided at the bottom of the slag discharging cavity. The heating tank is provided with a feeding port connected to the slag returning mechanism at the top, a guiding channel connected to the feeding port at the bottom, and at least two sets of material distributing devices are provided from top to bottom inside the heating tank. The material distributing device includes a fixed partition and a movable sleeve that can move relatively up and down. N through slots are radially formed on the fixed partition, and N slot plates are radially fixed on the movable sleeve. The N slot plates can be inserted into the N through slots one by one, and the bottom of each slot plate is a slope.

[0005] Preferably, a rotatable stirring shaft is coaxially provided inside the heating tank. The fixed partition and the movable sleeve are both sleeved outside the stirring shaft, and stirring rods that do not interfere with the material distributing device are fixed on the stirring shaft.

[0006] Preferably, a limiting boss is provided on the movable sleeve, a limiting disc is provided at the free end of the stirring shaft, a contact guiding surface is provided on the surface of the limiting boss and / or the limiting disc, and the limiting disc can be in contact with the bottom of the limiting boss through the contact guiding surface.

[0007] Preferably, the limiting boss has an inverted conical structure or a V-shaped structure, and the contact guiding surface is an inclined surface at the bottom of the limiting boss.

[0008] Preferably, the limiting disc has a circular structure or an oval structure, and the contact guiding surface is an arc surface on the surface of the limiting disc.

[0009] Preferably, the limiting disc can rotate eccentrically relative to the stirring rod.

[0010] Preferably, a rotatable drive shaft is provided inside the stirring shaft, a rotatable connecting rod is provided inside the stirring rod, a transmission bevel gear set is connected between one end of the connecting rod and the drive shaft, and the other end of the connecting rod is eccentrically fixed to the limiting disc.

[0011] Preferably, a rotatable material guiding screw is provided in the material guiding channel.

[0012] Preferably, the oil filtering mechanism includes a filtering box located below the oil outlet at the bottom of the screw oil press tank, and a filter plate and a slag scraping device are provided inside the filtering box.

[0013] Preferably, the slag scraping device includes three guide rollers distributed in a right triangle and a transmission belt sleeved outside the three guide rollers, and a plurality of scrapers capable of contacting the top of the filter plate are equidistantly fixed on the surface of the transmission belt.

[0014] Preferably, a plurality of filter holes are provided on the filter plate, a movable plug is provided in each filter hole, and the cross-sectional shapes of the filter holes and the movable plugs are both isosceles trapezoids.

[0015] Preferably, an installation through hole communicating therewith is opened on one side of each filter hole, a liftable pressure rod and a rotatable hollow screw are provided in the installation through hole, the hollow screw spirally penetrates through the movable plug, a spiral guide sleeve is fixed inside the hollow screw, a spiral pull rod spirally penetrating through the spiral guide sleeve is fixed at the bottom of the pressure rod, and a spring is connected between the pressure rod and the hollow screw.

[0016] Preferably, a plurality of pressing plates are provided on one side of each scraper, an inclined guiding surface is provided on one side of the pressing plate, and when the scraper moves towards the filter hole: the pressing plate on the scraper presses down the pressure rod on one side of the filter hole through the inclined guiding surface.

[0017] Preferably, the slag returning mechanism includes a feeding conveyor belt, a scraper conveyor and a dragon feeder connected in sequence between the oil filtering mechanism and the oil pressing mechanism.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) In the oil pressing mechanism of the castor oil press of the present invention, it includes a heating and feeding structure and a screw oil pressing structure. Among them, the heating and feeding structure guides the material in an intermittent and quantitative feeding manner, so as to uniformly heat the castor particles waiting for feeding, thereby improving the oil pressing effect.

[0019] (2) The heating and feeding structure includes a fixed partition and a movable sleeve that can move up and down relatively. Specifically, the lifting of the movable sleeve is driven by the relative sliding of the limit boss and the limit disk, and the limit disk can rotate eccentrically. Thus, the relative lifting distance between the fixed partition and the movable sleeve can be effectively adjusted, and then the intermittent feeding amount can be changed to avoid the accumulation or blockage of castor particles caused by too fast feeding.

[0020] (3) Based on the relative sliding of the limit boss and the limit disk, stirring structures such as a stirring shaft and stirring rods are cooperatively arranged to facilitate stirring of the castor particles during the heating and intermittent feeding process, thereby further ensuring the uniformity of heating.

[0021] (4) A filter oil mechanism and a slag return mechanism are provided to recycle and press the slag particles in the castor oil, improving the oil yield. The filter oil mechanism is internally provided with a filter plate and a slag scraping device to facilitate the recovery of slag particles.

[0022] (5) Movable stoppers that can move up and down are arranged in the filter holes of the filter plate to facilitate cleaning of the slag particles blocked in the filter holes, and the lifting of the movable stoppers is driven by the movement of the scraper in the slag scraping device, thereby effectively realizing the reasonable linkage of anti-blocking and slag particle recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of the present invention; Figure 2 is a perspective view of the oil pressing mechanism of the present invention; Figure 3 is a cross-sectional view of the screw oil pressing tank in the present invention; Figure 4 is a cross-sectional view of the heating tank in the present invention; Figure 5 is a cross-sectional view of the material distributing device in the present invention; Figure 6 is a perspective view of the movable sleeve in the present invention; Figure 7 is a cross-sectional view of the movable sleeve in the present invention; Figure 8 is a cross-sectional view of the fixed partition in the present invention; Figure 9 is a cross-sectional view of the stirring shaft in the present invention; Figure 10 isFigure 9 Enlarged view of part A in Figure 11 Cross-sectional view of the oil filtering mechanism in the present invention; Figure 12 Plan view of the cooperation between the filter plate and the slag scraping device in the present invention; Figure 13 is Figure 12 Enlarged view of part B in Figure 14 Cross-sectional view of the filter plate in the present invention; Figure 15 is Figure 14 Enlarged view of part C in Figure 16 Exploded view of the assembly of the pressure rod and the hollow screw in the present invention; Figure 17 is Figure 11 Enlarged view of part D in In the figure: oil pressing mechanism - 1; screw oil pressing tank - 11; oil pressing screw - 111; slag discharging stirring rod - 112; heating tank - 12; material distributing device - 13; fixed partition - 131; movable sleeve - 132; through groove - 133; groove plate - 134; limit boss - 135; stirring shaft - 14; stirring rod - 141; limit disc - 142; driving shaft - 143; connecting rod - 144; material guiding screw - 15; oil filtering mechanism - 2; filtering tank - 21; filter plate - 22; movable plug - 221; pressure rod - 222; hollow screw - 223; spiral guide sleeve - 224; spiral pull rod - 225; spring - 226; slag scraping device - 23; guide roller - 231; transmission belt - 232; scraper - 233; pressing plate - 234; slag returning mechanism - 3. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1 shown, the castor oil press provided by the present invention includes an oil pressing mechanism 1, an oil filtering mechanism 2, and a slag returning mechanism 3 that are connected in a circulating manner. Among them: the oil pressing mechanism 1 is used to press castor seeds to obtain castor oil and oil residue cakes. The oil residue cakes are directly discharged, and the castor oil is discharged to the oil filtering mechanism 2 for filtration. The slag returning mechanism 3 recovers the filtered slag particles, so that the slag particles are re-transported to the oil pressing mechanism 1 for secondary pressing. At the same time, the castor seeds after steaming and frying can also be transported to the oil pressing mechanism 1 through the slag returning mechanism 3.

[0026] like Figure 2 As shown, the oil pressing mechanism 1 includes a heating box 12 and a spiral oil pressing box 11 connected to the bottom of the heating box 12; like Figure 1 As shown, the oil filtering mechanism 2 includes a filter box 21 connected to the bottom of the screw oil pressing box 11; like Figure 1 As shown, the slag return mechanism 3 includes a feeding conveyor belt a1 / a2 matched with the filter box 21, a Jiaolong feeder c matched with the oil pressing mechanism 1, and a scraper conveyor b connected between the feeding conveyor belt a2 and the Jiaolong feeder c.

[0027] About the oil pressing mechanism 1 - heating before pressing by the heating box 12: Continue to refer Figure 4 As shown, the top of the heating box 12 is provided with a feed inlet connected to the Jiaolong feeder c, the bottom of the heating box 12 is provided with a material guide channel connected to the feed inlet at the top of the screw oil pressing box 11, and a rotatable material guide screw 15 is provided in the material guide channel.

[0028] Continue to refer Figure 4 As shown, a rotatable stirring shaft 14 is coaxially arranged inside the heating box 12, and at least two groups of material distribution devices 13 are sleeved on the outside of the stirring shaft 14 from top to bottom, and a stirring rod 141 that does not interfere with the material distribution device 13 is also fixed on the stirring shaft 14.

[0029] Continue to refer Figures 5 - 8 As shown, the material dividing device 13 includes a fixed partition 131 and a movable sleeve 132 which can be lifted and lowered relative to each other. The fixed partition 131 is radially provided with N through grooves 133, and the movable sleeve 132 is radially fixed with N slot plates 134. The N slot plates 134 can be inserted into the N through grooves 133 one by one, and the bottom of each slot plate 134 is an inclined surface.

[0030] Continue to refer Figure 6 As shown, the movable sleeve 132 is provided with a limiting boss 135 with an inverted cone structure or a V-shaped structure.

[0031] Continue to refer Figure 5 , Figure 9 and Figure 10 As shown, a rotatable driving shaft 143 is provided inside the stirring shaft 14, a rotatable connecting rod 144 is provided inside the stirring rod 141, and a transmission bevel gear set is connected between one end of the connecting rod 144 and the driving shaft 143, and the other end of the connecting rod 144 is eccentrically fixed with a limiting plate 142 located outside the stirring rod 141, and the limiting plate 142 has a circular structure or an elliptical structure, and its limiting plate 142 can abut against the bottom of the limiting boss 135.

[0032] As described above, the stirring shaft 14 can be driven to rotate by a motor installed on the top of the heating box 12. Specifically, when the stirring shaft 14 rotates, the stirring rods 141 thereon are driven to rotate and stir, so as to ensure the uniform heating of the castor particles in the heating box 12. The rotation of the stirring shaft 14 and the stirring rods 141 drives the limiting disc 142 to rotate in the heating box 12, so that the limiting disc 142 and the limiting boss 135 will move relatively. The limiting boss 135 is specifically a conical structure. Therefore, when the limiting disc 142 abuts against the bottom of the limiting boss 135, it will push the limiting boss 135 and the movable sleeve 132 to rise, so that the groove plate 134 rises from the through groove 133. At this time, the through groove 133 changes from a closed state to a conducting state, and the castor particles pass through the through groove 133 for material guiding. The multi-component material device 13 divides the interior of the heating box 12 into multiple heating spaces. The uppermost layer is the feeding space, and the lowermost layer is the discharging space. The castor particles sequentially pass through multiple heating spaces from top to bottom and are continuously heated, which can effectively ensure the heating effect of the castor particles. Moreover, the stirring rods 141 in each heating space can be arranged in a staggered manner, so that the multiple heating spaces are not connected simultaneously.

[0033] Furthermore, the motor installed in the stirring shaft 14 can drive the driving shaft 143 to rotate. The driving shaft 143 drives the connecting rod 144 to rotate through the transmission bevel gear set, and then drives the limiting disc 142 to rotate eccentrically. Combining Figure 4 and Figure 5 it can be known that when the rotation angle of the limiting disc 142 is different, when the limiting disc 142 abuts against the bottom of the limiting boss 135, the rising heights of the movable sleeve 132 and the groove plate 134 are also different relatively. Since the bottom of the groove plate 134 is set as an inclined surface, different areas of conduction of the through groove 133 can be formed according to the different rising heights of the groove plate 134, and then the material guiding amount at each connection can be changed.

[0034] Regarding the oil pressing mechanism 1 - pressing through the screw oil pressing tank 11: Continue to refer to Figure 3 As shown, an oil pressing cavity and a slag discharging cavity are provided in the screw oil pressing tank 11 and are connected through a central channel. The inner diameters of the oil pressing cavity and the slag discharging cavity are both larger than the inner diameter of the central channel. A rotatable oil pressing screw 111 is provided in the oil pressing cavity, and a rotatable slag discharging stirring rod 112 is provided in the slag discharging cavity. The oil pressing screw 111 and the slag discharging stirring rod 112 are coaxially fixed. The feeding port is communicated with the top of the oil pressing cavity, and an oil outlet communicated with the oil filtering mechanism 2 is provided at the bottom of the oil pressing cavity, and a slag discharging port is provided at the bottom of the slag discharging cavity.

[0035] The castor particles are intermittently and layer by layer guided from the uppermost feeding space to the lowermost discharging space through the material distributing device 13. The guiding channel is communicated with the discharging space. Thus, the castor particles in the discharging space can be sent into the oil pressing cavity by the rotation of the guiding screw 15. The oil pressing screw 111 rotates in the oil pressing cavity to perform spiral feeding and extrusion on the castor particles. The pressed castor oil is discharged through the oil outlet into the filtering box 21, and the oil residue passes through the central channel and is discharged through the residue discharging port at the bottom of the residue discharging cavity.

[0036] Regarding the oil filtering mechanism 2 - separating the incompletely pressed slag particles contained in the castor oil: As Figure 11 shown, the oil filtering mechanism 2 includes a filtering box 21 located below the oil outlet at the bottom of the spiral oil pressing tank 11, and a filter plate 22 and a slag scraping device 23 are arranged inside the filtering box 21.

[0037] Continue to refer to Figure 12 and Figure 13 shown, the slag scraping device 23 includes three guide rollers 231 distributed in a right triangle and a transmission belt 232 sleeved outside the three guide rollers 231, and a plurality of scraping plates 233 capable of contacting the top of the filter plate 22 are fixedly arranged at equal intervals on the surface of the transmission belt 232.

[0038] The above: the right-angled base of the right triangle is parallel to the filter plate 22. One side of the filtering box 21 is provided with a slag discharging slot, and the slag discharging slot is located on the right-angled side of the right triangle. The hypotenuse of the right triangle serves as the feeding position of the oil filtering mechanism 2. In Figure 12 it, the transmission belt 232 is driven in the counterclockwise direction. Thus, the castor oil discharged from the spiral oil pressing tank 11 falls onto the hypotenuse i of the transmission belt 232. As the transmission belt 232 is driven counterclockwise, the castor oil is conveyed to the top of the filter plate 22. Under the filtering action of the filter plate 22, the oil drops below the filter plate 22, and the slag particles stay on the top of the filter plate 22 and are pushed by the scraping plates 233 to the right-angled side ii along with the transmission of the transmission belt 232 until they are discharged through the slag discharging slot onto the feeding conveyor belt a1.

[0039] Regarding the oil filtering mechanism 2 - cleaning the blockage of the filter plate 22 by the scraping plate 233: Continue to refer to Figures 14 - 16 shown, a plurality of filter holes are provided on the filter plate 22, and a movable plug 221 is arranged in each filter hole; an installation through hole communicated with each filter hole is opened on one side of each filter hole, and a liftable pressure rod 222 and a rotatable hollow screw 223 are arranged in the installation through hole. The hollow screw 223 spirally penetrates through the movable plug 221, and a spiral guide sleeve 224 is fixed inside the hollow screw 223. A spiral pull rod 225 spirally penetrating through the spiral guide sleeve 224 is fixed at the bottom of the pressure rod 222, and a spring 226 is connected between the pressure rod 222 and the hollow screw 223.

[0040] Continue to refer to Figure 17 As shown, on one side of each of the scraping plates 233, a plurality of pressing plates 234 are provided (such that the scraping plates 233 form a comb-like structure, and during the movement of the scraping plates 233, the filter holes are correspondingly located between two adjacent pressing plates 234). On one side of the pressing plate 234, an inclined guiding surface is provided, and when the scraping plate 233 moves towards the filter hole: the pressing plate 234 on the scraping plate 233 presses against and depresses the pressing rod 222 on one side of the filter hole through the inclined guiding surface.

[0041] The above: The cross-sections of the filter holes and the movable stoppers 221 can both be preferably set as isosceles trapezoids. As Figure 15 shown, in the initial position, the movable stopper 221 is located at the lowest position, and a gap for filtration is formed between the movable stopper 221 and the filter hole. At this time, under the action of the spring 226, the pressing rod 222 protrudes from the top of the filter plate 22. As the conveyor belt 232 conveys, the scraping plate 233 moves on the surface of the filter plate 22, and one side pressing plate 234 gradually approaches the pressing rod 222. Combining Figure 13 and Figure 17 it can be known that the side of the pressing plate 234 facing the pressing rod 222 is an inclined guiding surface. Therefore, under the action of the inclined guiding surface and the movement of the pressing plate 234, the pressing rod 222 is squeezed by the inclined surface and moves downward in the mounting through hole, and drives the spiral pull rod 225 to pass through the spiral guide sleeve 224 and extend into the hollow screw 223. During this process, the spiral pull rod 225 drives the spiral guide sleeve 224 to rotate, and then drives the hollow screw 223 to rotate. The hollow screw 223 is in screw fit with the movable stopper 221 to drive the movable stopper 221 to move upward, so as to push out the slag particles falling into the filter hole and avoid blockage of the filter hole (the slag particles pushed out from the filter hole are located between two adjacent pressing plates 234 and are carried out as the scraping plate 233 moves).

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A castor oil pressing device, characterized in that: It includes an oil pressing mechanism, an oil filtering mechanism and a residue returning mechanism which are circulated and connected; The oil pressing mechanism comprises a screw oil pressing box and a heating box connected to a feed port at the top of the screw oil pressing box; The screw oil pressing box is provided with an oil pressing chamber and a slag discharge chamber connected through a central channel, and the inner diameters of the oil pressing chamber and the slag discharge chamber are both larger than the inner diameter of the central channel; a rotatable oil pressing screw is provided in the oil pressing chamber, and a rotatable slag discharge stirring rod is provided in the slag discharge chamber, and the oil pressing screw and the slag discharge stirring rod are coaxially fixed; the feed port is connected to the top of the oil pressing chamber, and an oil outlet connected to the oil filter mechanism is provided at the bottom of the oil pressing chamber, and a slag discharge port is provided at the bottom of the slag discharge chamber; The top of the heating box is provided with a feed inlet connected to the slag return mechanism, the bottom of the heating box is provided with a material guide channel connected to the feed inlet, and at least two groups of material devices are provided inside the heating box from top to bottom; The material dividing device comprises a fixed partition and a movable sleeve which can be lifted and lowered relative to each other, the fixed partition is provided with N through slots in a radial pattern, the movable sleeve is provided with N slot plates in a radial pattern, the N slot plates can be inserted into the N through slots one by one, and the bottom of each slot plate is an inclined surface.

2. A castor oil pressing device according to claim 1, characterized in that: A rotatable stirring shaft is coaxially arranged inside the heating box, the fixed partition plate and the movable sleeve are both sleeved outside the stirring shaft, and a stirring rod which does not interfere with the material distribution device is fixed on the stirring shaft.

3. A castor oil pressing device according to claim 2, characterized in that: The movable sleeve is provided with a limiting boss, the free end of the stirring shaft is provided with a limiting disk, the surface of the limiting boss and / or the limiting disk is provided with a resistance guide surface, and the limiting disk can resist the bottom of the limiting boss through the resistance guide surface.

4. A castor oil pressing device according to claim 3, characterized in that: The limiting boss is in an inverted cone structure or a V-shaped structure, and the abutting guide surface is an inclined surface at the bottom of the limiting boss.

5. A castor oil press according to claim 3 or 4, characterized in that: The limiting disk is in a circular structure or an elliptical structure, and the abutting guide surface is an arc surface of the limiting disk.

6. A castor oil pressing device according to claim 5, characterized in that: The limiting plate can rotate eccentrically relative to the stirring rod.

7. A castor oil pressing device according to claim 6, characterized in that: A rotatable driving shaft is provided inside the stirring shaft, a rotatable connecting rod is provided inside the stirring rod, a transmission bevel gear set is connected between one end of the connecting rod and the driving shaft, and the other end of the connecting rod is eccentrically fixed to the limiting disk.

8. A castor oil pressing device according to claim 1, characterized in that: A rotatable material guiding screw is arranged in the material guiding channel.

9. A castor oil pressing device according to claim 1, characterized in that: The oil filtering mechanism comprises a filter box located below the oil outlet at the bottom of the spiral oil pressing box, and a filter plate and a scraping device are arranged inside the filter box.

10. A castor oil pressing device according to claim 9, characterized in that: The scraper device comprises three guide rollers distributed in a right triangle and a transmission belt sleeved outside the three guide rollers, and a plurality of scrapers capable of contacting the top of the filter plate are fixed equidistantly on the surface of the transmission belt.

11. A castor oil pressing device according to claim 10, characterized in that: The filter plate is provided with a plurality of filter holes, each of the filter holes is provided with a movable plug that can be raised and lowered, and the cross-sectional shapes of the filter holes and the movable plug are both isosceles trapezoids.

12. A castor oil pressing device according to claim 11, characterized in that: A mounting through hole connected to the filter hole is provided on one side of each filter hole, and a liftable pressure rod and a rotatable hollow screw are provided in the mounting through hole. The hollow screw spirally penetrates a movable plug, and a spiral guide sleeve is fixed inside the hollow screw. A spiral pull rod spirally penetrating the spiral guide sleeve is fixed at the bottom of the pressure rod, and a spring is connected between the pressure rod and the hollow screw.

13. A castor oil pressing device according to claim 12, characterized in that: A plurality of pressure plates are arranged on one side of each scraper, and an inclined guide surface is arranged on one side of the pressure plate. When the scraper moves toward the filter hole, the pressure plate on the scraper contacts and presses down the pressure rod on one side of the filter hole through the inclined guide surface.

14. A castor oil pressing device according to claim 1, characterized in that: The slag return mechanism comprises a feeding conveyor belt, a scraper conveyor and a dragon feeder which are sequentially connected between the oil filtering mechanism and the oil pressing mechanism.

Images