Controllable hydraulic screw press

Abstract

The present application belongs to the technical field of oil processing, and provides a controllable hydraulic spiral oil press, which comprises a press hole and a press screw horizontally installed in the press hole, an air cavity is arranged in the press screw along the axial direction, one end of the air cavity is a sealed end, and the other end is an open end, the open end of the air cavity is sealingly and rotatably connected with a hydraulic pipeline, the hydraulic pipeline is connected with a hydraulic pump group, a plurality of partitions are sealingly installed in the air cavity at a certain distance to separate the air cavity into a plurality of hydraulic chambers, an electromagnetic valve is installed on each partition, each electromagnetic valve is separately connected with an external power supply, and the electromagnetic valve is connected with its two adjacent hydraulic chambers in communication or isolation through opening and closing. The present application can provide a stable oil pressing rate, avoid the problem of press screw jamming during the operation of the oil press, improve the oil quality, and ensure the mechanical working efficiency and the oil pressing rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil processing, and particularly relates to a controllable hydraulic screw oil press. BACKGROUND

[0002] At present, in order to improve the oil extraction quality, most screw oil presses generally control the temperature and pressure during oil extraction. In the aspect of pressure control, the most typical method is to control the density of the embryo material in the bore by changing the screw feed rate of the oil press to freely regulate the pressure in the bore within a reasonable threshold according to the requirements; another method is to directly control the amount of feed to achieve pressure control. Both of the above methods control the pressure by controlling the density of the embryo material in the bore, which has the following problems: first, if the amount of material in the bore is constantly controlled during the work process, the material feed speed needs to be constantly changed, and the machine is prone to have the problem of screw jamming, which causes a series of damages and leads to serious economic losses; second, constant control of the amount of feed will directly lead to an inconstant extraction rate, thereby it is difficult to ensure the mechanical efficiency; third, the space in the bore of the oil press cannot be fully utilized, thereby affecting the oil extraction rate. SUMMARY

[0003] To solve the above technical problems, the purpose of the present application is to provide a controllable hydraulic screw oil press, which can provide a stable oil extraction rate and avoid the problem of screw jamming during the operation of the oil press, improve the oil extraction quality, and ensure the mechanical efficiency and the oil extraction rate.

[0004] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0005] A controllable hydraulic screw oil press, comprising a bore and a screw horizontally installed in the bore, wherein the screw is provided with a cavity in the axial direction, one end of the cavity is a sealed end, and the other end is an open end, the open end of the cavity is sealingly and rotatably connected with a hydraulic pipeline, the hydraulic pipeline is connected with a hydraulic pump group, a plurality of partitions are sealingly installed in the cavity at a certain distance to divide the cavity into a plurality of hydraulic chambers, an electromagnetic valve is installed on each partition, each electromagnetic valve is separately connected with an external power supply, and the electromagnetic valve communicates or isolates the two adjacent hydraulic chambers by opening and closing.

[0006] Optionally, the inner diameter of the cavity gradually increases from the feed side to the discharge side of the oil press.

[0007] Optionally, the small-diameter end of the cavity at the feed side of the oil press is the sealed end, and the large-diameter end of the cavity at the discharge side of the oil press is the open end.

[0008] Optionally, the outer surface and the inner surface of the screw are designed as wavy curved surfaces.

[0009] Optionally, the inner wall of the cavity is designed as a ladder shape, and the partition plate is installed at the corresponding ladder.

[0010] Optionally, the inner wall of each hydraulic chamber is installed with a torsion resistance metal strip.

[0011] Optionally, the cavity and the hydraulic pipeline are rotationally connected through a bearing.

[0012] Optionally, the screw hole and the screw rotate in the same direction, and the rotation speed of the screw hole is less than that of the screw.

[0013] Optionally, the oil press further comprises a belt pulley assembly, the belt pulley assembly comprises a motor, a speed reducer connected with the motor, a main belt pulley installed on the output shaft of the speed reducer, a small belt pulley and a large belt pulley installed on the screw, and a belt connecting the main belt pulley with the small and large belt pulleys, the small belt pulley is fixedly connected with the screw, the large belt pulley is rotationally connected with the screw and fixedly connected with the screw hole.

[0014] Optionally, the difference between the rotation speeds of the screw hole and the screw is 30r / min-60r / min.

[0015] The present application has the following beneficial effects: the present application designs the screw as a hollow structure, and sets a hydraulic pump group to deliver liquid into the cavity and control the size of the liquid pressure in the cavity to control the deformation of the cavity, and finally controls the pressure of the screw hole. Specifically, to reduce the sealing structure and ensure the sealing effect, the cavity is designed as a structure with one end blocked and one end opened, and in order to keep the hydraulic pipeline and the screw rotationally connected, the hydraulic pipeline and the screw are kept in a relatively stationary state, in order to accurately control the size of the hydraulic pressure in the cavity, the cavity is divided into several separate and sealed hydraulic chambers by a partition plate, when the required pressure is greater than the real-time pressure value in the hole, the hydraulic chamber close to the hydraulic pipeline is filled with liquid, the hydraulic pump group can automatically adjust the hydraulic value to increase, the screw will show an inflation trend under the influence of the hydraulic pressure in the cavity, so that the pressure in the hole increases, when the pressure needs to be further increased, the corresponding solenoid valve is energized, the liquid enters the corresponding hydraulic chamber, the pressure in the cavity increases, and the pressure in the hole increases accordingly, otherwise, if the pressure needs to be reduced, the liquid in the cavity is extracted. In addition, the cavity is divided into several hydraulic chambers, the pressure of each section in the hole can be detected and accurately provided by the deformation of the screw, the segmented control of the pressure in the hole is better realized, the different pressure requirements of different sections of the screw are met, and the multiple hydraulic chambers are connected in series to control the pressure, which can control the size of the hydraulic value in each chamber in turn, so that the quality of the oil can be stably and effectively improved.

[0016] The present application changes the pressure in the chamber by controlling the deformation of the screw through controlling the hydraulic pressure in the screw cavity, replaces the existing way of controlling the pressure by controlling the size of the embryo material in the chamber, can provide stable oil pressing rate without changing the material feeding speed, can effectively prevent the screw from being locked and other faults, avoids subsequent maintenance and technical improvement and other work, ensures the mechanical working efficiency and oil pressing rate, and effectively improves the oil quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0018] Figure 1 is the overall external structure schematic diagram of the controllable hydraulic screw oil press provided by the present application;

[0019] Figure 2 is the overall internal structure schematic diagram of the controllable hydraulic screw oil press provided by the present application Figure 1 ;

[0020] Figure 3 is the overall internal structure schematic diagram of the controllable hydraulic screw oil press provided by the present application Figure 2 ;

[0021] Figure 4 is the overall sectional view of the controllable hydraulic screw oil press provided by the present application;

[0022] Figure 5 is Figure 4 the enlarged schematic diagram of the I place in the

[0023] Figure 6 is the structure schematic diagram of the screw in the controllable hydraulic screw oil press provided by the present application;

[0024] Figure 7 is the structure schematic diagram of the fixed material grinding chamber in the controllable hydraulic screw oil press provided by the present application;

[0025] Figure 8 is the structure schematic diagram of the tapered opening sleeve in the controllable hydraulic screw oil press provided by the present application;

[0026] Figure 9 is the structure schematic diagram of the barrier chamber half in the controllable hydraulic screw oil press provided by the present application;

[0027] Figure 10 is the structure schematic diagram of the barrier chamber half in the controllable hydraulic screw oil press provided by the present application.

[0028] In the figure: 1-feeding hopper, 2-fixed grinding chamber, 3-bearing sleeve, 4-roller, 5-first pulley, 6-second pulley, 7-base, 8-shaft support, 9-motor, 10-reduction box, 11-hydraulic pump group, 12-T-shaped pipe, 13-small pulley, 14-large pulley, 15-separation chamber, 16-extraction chamber, 18-oil groove, 19-first fixed frame, 20-second fixed frame, 21-conical opening sleeve, 22-extraction screw, 22.1-cavity, 22.1.1-hydraulic chamber, 22.2-sealing end, 22.3-opening end, 24-hydraulic pipe, 25-extraction screw transmission straight cylinder, 26-bearing, 27-first thrust bearing, 28-thrust bearing, 29-wireless electromagnetic valve, 30-electromagnetic valve, 31-separation plate, 31.1-groove, 32-torsion resistance metal strip, 33-main pulley, 34-belt. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" and "several" is two or more.

[0032] As Figures 1-6As shown, the present application provides a controllable hydraulic screw oil press, which comprises a pressing chamber 16 and a pressing screw 22 horizontally installed in the pressing chamber 16. The pressing screw 22 is provided with a cavity 22.1 in the axial direction. One end of the cavity 22.1 is a sealed end 22.2, and the other end is an open end 22.3. The open end 22.3 of the cavity 22.1 is sealingly and rotatably connected with a hydraulic pipeline 24. The hydraulic pipeline 24 is connected with a hydraulic pump set 11. A plurality of partitions 31 are sealingly installed in the cavity 22.1 at a certain distance to divide the cavity 22.1 into a plurality of hydraulic chambers 22.1.1. Each partition 31 is provided with an electromagnetic valve 30. Each electromagnetic valve 30 is separately connected with an external power source. The electromagnetic valve 30 is opened and closed to connect or separate the two adjacent hydraulic chambers 22.1.1. The partitions can be tightly clamped in the cavity by the deformation force of the pressing screw. The number of partitions can be selected according to actual conditions, and 3-8 partitions can be used. In this embodiment, 4 partitions are used to divide the cavity into 5 hydraulic chambers. Based on the different pressure requirements of the thick end and the thin end of the pressing screw, the pressing screw is divided into a five-chamber structure to better achieve the segmented control of the pressure in the chamber, meet the different pressure requirements of different sections of the pressing screw, and sequentially control the hydraulic value in each chamber by using the five-chamber linked pressure control method. The partitions can be made of metal plates with strong deformation resistance. A through hole is arranged in the center of the partition for installing the electromagnetic valve. When a certain electromagnetic valve is opened, the left and right hydraulic chambers of the partition are connected, and the hydraulic values of the two adjacent chambers are equal.

[0033] In one embodiment, as shown in Figure 4 、 Figure 6 Since the outer diameter of the pressing screw gradually increases from the feeding side to the discharging side of the oil press, the inner diameter of the cavity also gradually increases from the feeding side to the discharging side of the oil press.

[0034] In actual production, the pressure value at the thick end of the pressing screw is usually much larger than that at the thin end. Therefore, the end close to the discharging side needs to be adjusted. As shown in Figure 4 、 Figure 6 the small-diameter end of the cavity at the feeding side of the oil press is a sealed end, and the large-diameter end at the discharging side is an open end. That is, the large-diameter end of the cavity is connected with the hydraulic pipeline. During the adjustment process, only the valve on the door plate of the hydraulic chamber at this end needs to be opened to achieve the purpose of individually controlling the hydraulic value. Conversely, if the hydraulic value in the hydraulic chamber close to the thin end needs to be controlled, the electromagnetic valves of all the partitions need to be opened. By sequentially adjusting the hydraulic value and closing the valves, the hydraulic control of all the hydraulic chambers can be achieved.

[0035] In one embodiment, as shown in Figure 4 、 Figure 6As shown, the outer surface and the inner surface of the screw are designed as wavy curved surfaces, the wavy screw surface structure can effectively reduce the surface bending stress, so that it has high deformability while storing hydraulic pressure, and still shows good toughness under huge hydraulic pressure. The screw itself can be made of thin manganese steel material.

[0036] In one embodiment, as shown in Figure 4 , Figure 6 As shown, the inner wall of the cavity is designed as a ladder shape, and the partition plate is installed at the corresponding ladder. The inside of the screw is ladder-shaped, which can provide a limit for the partition plate of the built-in hydraulic chamber. The side of the partition plate is provided with a magnet, which is tightly clamped by the deformation force of the screw.

[0037] In one embodiment, as shown in Figure 6 The inner wall of each hydraulic chamber is provided with a torsion resistance metal strip 32. In the deformable screw of the present application, the screw is designed and provided with a torsion resistance metal strip, which can prevent the hollow screw from being damaged by the large torsion generated during the transmission of power from the belt pulley to the screw. During processing, the torsion resistance metal strip can be integrally formed with the screw. Correspondingly, as shown in Figure 10 The partition plate 31 is provided with a groove 31.1, and the partition plate slides along the torsion resistance metal strip to the specified position (in this embodiment, the specified position is the step corresponding to the partition plate).

[0038] In one embodiment, as shown in Figure 4 , Figure 5 As shown, the cavity 22.1 and the hydraulic pipeline 24 are connected by a bearing 26. In the screw with deformation ability, the bearing cooperates with the hydraulic pipeline, and the chamber is isolated from the air outside the chamber by adding a bearing sealing ring 23 and other oil seal means. In addition, the present application can also cooperate with a three-way pipeline at the end of the hydraulic pipeline, and is provided with a wireless electromagnetic valve 29 which can control the opening and closing of the pipeline according to the demand, so as to control the value of the hydraulic pressure in the screw, thereby controlling the deformation of the cavity, and finally achieving the purpose of controlling the pressure in the bore.

[0039] For the existing oil press, only the action of gravity is used to collect oil, which not only has low working efficiency, but also is difficult to collect all the oil into the oil tank, causing serious waste of oil. The residual oil in the bore of the screw oil press is mostly 5% or more than 5% of the total amount of oil that can be extracted from the embryo material. In view of the waste problem caused by the screw oil press, the present application uses a centrifugal structure to quickly separate the oil from around the bore, and forces the oil to separate from the paste in the bore in advance, which not only effectively reduces the residual oil rate in the oil press, but also greatly improves the oil extraction rate. In addition, the present application plans different adaptive speeds for the embryo material of different varieties for the oil press, so that the oil press has a wider application range.

[0040] In one embodiment, as shown in Figures 1-4As shown, the pressing chamber and the screw rotate in the same direction, but the rotational speed of the pressing chamber is less than that of the screw. Based on the traditional static screw oil press, this invention enables the pressing chamber and the screw to rotate at different speeds in the same direction. This differential speed between the rotating chamber and the screw allows for proper feeding of the raw material. The high-speed rotating chamber increases the oil yield and efficiency, significantly improving the oil extraction rate and reducing the residual oil rate. Simultaneously, as the material transitions from the static chamber to the rotating pressing chamber, it immediately begins high-speed rotation, while the screw's action enables slow propulsion, maximizing the utilization of the internal space. Furthermore, this invention employs a centrifugal rotating structure, where the high-speed rotation of the screw and the pressing chamber forces the oil to separate from the pasty material inside the chamber and rapidly extracts the oil, significantly increasing the oil production and collection rates. The centrifugal rotating structure allows residual oil to be separated from the machine and collected during high-speed rotation, rather than adhering to the machine surface, thus significantly limiting the residual oil rate.

[0041] In one embodiment, such as Figures 2-5 As shown, the oil press also includes a pulley assembly, which includes a motor 9, a gearbox 10 connected to the motor, a main pulley 33 mounted on the output shaft of the gearbox, a small pulley 13 and a large pulley 14 mounted on the screw press, and a belt 34 connecting the main pulley, the small pulley, and the large pulley. The small pulley is fixedly connected to the screw press, and the large pulley is rotatably connected to the screw press and fixedly connected to the pressing chamber. This invention, by setting up the pulley assembly, allows a single motor to drive the screw press and the pressing chamber to rotate synchronously at high speed, and the large and small pulleys create a differential speed between the pressing chamber and the screw press.

[0042] In one embodiment, the speed difference between the pressing chamber and the screw press is 30 r / min to 60 r / min.

[0043] In the whole process of extracting oil, two different belt pulleys provide two different rotating speeds, so that the screw and the barrel are in high-speed rotating state, but there is a differential between them. For example, in an embodiment, the small belt pulley has a diameter of 483 mm, which cooperates with the screw, and the large belt pulley has a diameter of 557 mm, which cooperates with the barrel. In this state, the rotating speed of the screw is slightly greater than that of the barrel, which is used to provide the power for feeding the material. The power supply source of the oil press can be a common AC variable frequency motor, and its rotating speed can generally reach 1450 r / min. After being reduced by a reduction box with a reduction ratio of about 2:1, and after transmitting power through a 200 mm main belt pulley, the rotating speed difference between the barrel and the screw is 40 r / min, which is suitable for mixed materials and some soft materials. Adjusting the rotating speed of the motor to about 2050 r / min, the rotating speed difference between the barrel and the screw is 57 r / min, which is suitable for peanuts and other hard materials. The present application has a constant processing rate, which provides reliable data for production, and the processing rate is stable at 50 kg / h-70 kg / h.

[0044] The present application can adjust the material feeding rate according to the variety of the material, and is suitable for most oil products. The following table lists the reasonable pressing temperature range corresponding to different oil materials and a reasonable rotating speed value of the screw rod driving motor:

[0045]

[0046] Correspondingly, the reduction ratio of the motor in the above table is 30:1, that is, when the rotating speed of the motor is 1200 r / min, the rotating speed of the screw rod is 40 r / min.

[0047] For example, Figures 1-9As shown, the oil press of the present application is installed on a base 7, and the pressing chamber is fixedly installed on the base through a first fixing frame 19 and a second fixing frame 20. In operation, the embryo material is put into through the feeding hopper 1, and is crushed in the fixed crushing chamber 2 through the crushing roller 4, the both ends of the crushing roller are provided with bearing sleeves 3, and the embryo material enters the lower end stationary chamber through the vertical pipeline under the action of gravity, the crushing roller is driven by another belt pulley set, the belt pulley set is installed on the base through the shaft support 8, and the belt pulley set comprises a first belt pulley 5 and a second belt pulley 6, the second belt pulley can be installed on the output shaft of the speed reducer, and is driven by the same motor 9. The fixed crushing chamber 2 is stationary relative to the ground in operation, and serves as the fixed end and the buffer chamber of the rotating end in the embryo material walking path, and the right end is provided with a notch to clamp the first thrust bearing 27 with the pressing screw 22. The embryo material is fed through the feeding screw provided on the pressing screw 22 after passing through the stationary crushing chamber, and is extruded to extrude oil under the extrusion of the centrifugal pressing chamber 16 and the pressing screw 22. The large belt pulley 14 and the small belt pulley 13 are matched with the conical hole sleeve 21 (fixedly connected with the pressing chamber) and the pressing screw transmission straight cylinder 25 (fixedly connected with the pressing screw) through pin keys and fastening screws respectively, notches are arranged on the adjacent end faces of the two, the second thrust bearing 28 is clamped, and the centrifugal pressing chamber 16 and the pressing screw 22 are driven to rotate at high speed respectively. In the feeding process of the embryo material, the oil is quickly separated from the machine due to the centrifugal effect, and is discharged from the strip hole provided on the pressing chamber, and is collected through the blocking chamber 15. After the embryo material is finished to be pressed, the embryo material is splashed out from the conical hole sleeve 21, is blocked through the right side narrow chamber of the blocking chamber, and is discharged from the right chamber bottom square hole under the action of gravity, and is collected and slid through the oil groove 18.

[0048] The present application uniformly sets the limiting steps on the wave-shaped curved surface in the pressing screw 22, a magnet is arranged on one side of the partition plate 31, and the partition plate is tightly clamped through the deformation force of the pressing screw. In the case that the hydraulic values in the five chambers from left to right are sequentially increased, the partition plate can be tightly attached to the limiting steps. The coarse end of the pressing screw is matched with the hydraulic pipeline 24 through a bearing, and a bearing sealing ring 23 is added to block air, and the hydraulic pipeline 24 is connected with the hydraulic pump group through a T-shaped pipe 12. In the mechanical operation process, the hydraulic pipeline is in a relatively stationary state relative to the ground. The present application detects the pressure through the built-in pressure sensor, and realizes intelligent control of the electromagnetic valve 30 in the pressing screw and the wireless electromagnetic valve 29 on the T-shaped pipe 12 through the controller, and controls the hydraulic values in the chambers to be within the reasonable threshold through the five-chamber linked pressure control method. At the same time, the hydraulic value provided by the hydraulic pump group is stably kept at about 50MPa. The power supply source of the present application can adopt a common alternating frequency motor, the rotating speed of which can generally reach 1450r / min, and a speed reducer is used to reduce the transmission torque, and the speed reduction ratio is about 2:1.

[0049] Compared with the traditional oil press, the present application has two major changes: the cavity pressing screw is used to store the adjustable hydraulic pressure to adjust the pressure in the chamber, and the belt pulley sets with different sizes are used to provide the required centrifugal differential speed between the pressing chamber and the pressing screw to collect the oil.

[0050] The present application has the following advantages: 1. The present application adopts a centrifugal rotating structure, the high-speed rotation of the screw and the barrel forces the oil liquid to separate from the paste in the barrel, and the oil liquid is rapidly extracted from the barrel, greatly improving the oil liquid output rate and collection rate; 2. The present application uses a centrifugal rotating structure to separate the mechanical residual oil from the machine under high-speed rotation and collect it, rather than attaching it to the surface of the machine, so that the mechanical residual oil rate will be greatly limited; 3. The present application uses a centrifugal rotating structure to make full use of the space in the oil press barrel; 4. The present application adopts a cavity screw, which can detect the pressure of each section in the barrel and accurately provide the required pressure of each section in the barrel through the deformation of the screw, so that the oil quality can be effectively improved; 5. The present application adopts a cavity screw, which can change the pressure by deforming the screw while avoiding the control of the size of the embryo material in the barrel, effectively preventing the screw from being stuck and other failures, and avoiding subsequent maintenance and technical improvement; 6. The present application has the function of adjusting the speed difference between the screw and the barrel under the support of the differential structure of the pulley set, which can adjust the material feeding rate according to the variety of the material, and is suitable for most oil embryo products; 7. The present application has a constant processing rate, which provides reliable data for production, and the processing rate can be stabilized at 50-70 kg / h.

[0051] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should belong to the protection scope of the claims of the present application.

Claims

1. A controllable hydraulic screw press, comprising a barrel and a screw horizontally installed in the barrel, characterized in that, The cavity is provided with a sealed end and an open end, the open end is sealingly and rotatably connected with a hydraulic pipeline, the hydraulic pipeline is connected with a hydraulic pump group, a plurality of partitions are sealingly installed in the cavity at intervals to divide the cavity into a plurality of hydraulic chambers, an electromagnetic valve is installed on each partition, each electromagnetic valve is separately connected with an external power source, and the electromagnetic valve is used to connect or separate two adjacent hydraulic chambers.

2. A controllable hydraulic screw press according to claim 1, characterized in that The inner diameter of the cavity gradually increases from the feeding side to the discharging side of the oil press.

3. A controllable hydraulic screw press according to claim 2, characterized in that The small-diameter end of the cavity at the feeding side of the oil press is the sealed end, and the large-diameter end of the cavity at the discharging side of the oil press is the open end.

4. A controllable hydraulic screw press according to claim 2, characterized in that The outer surface and the inner surface of the screw are designed as wavy curved surfaces.

5. A controllable hydraulic screw press according to claim 1 or 2 or 3 or 4, characterized in that, The inner wall of the cavity is designed as a stepped shape, and the partitions are installed at corresponding steps.

6. The controllable hydraulic screw press of claim 1, wherein, A torsion-resistant metal strip is installed on the inner wall of each hydraulic chamber.

7. A controllable hydraulic screw press according to claim 1 or 3, characterized in that The cavity and the hydraulic pipeline are rotatably connected through a bearing.

8. The controllable hydraulic screw press of claim 1, wherein, The screw hole and the screw rotate in the same direction, and the rotation speed of the screw hole is less than that of the screw.

9. The controllable hydraulic expeller as claimed in claim 1, wherein, The oil press further comprises a belt wheel assembly, the belt wheel assembly comprises a motor, a reduction box connected with the motor, a main belt wheel installed on the output shaft of the reduction box, a small belt wheel and a large belt wheel installed on the screw, and a belt connecting the main belt wheel with the small and large belt wheels, the small belt wheel is fixedly connected with the screw, the large belt wheel is rotatably connected with the screw and fixedly connected with the screw hole.

10. The controllable hydraulic screw press of claim 1, wherein, The difference between the rotation speeds of the screw hole and the screw is 30 r / min-60 r / min.

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