Cooling spiral shaft and spiral cold press

Abstract

The invention provides a cooling spiral shaft which comprises a cone-frustum-shaped rotating shaft, spiral pressing teeth are arranged on the outer portion of the rotating shaft, and the spiral pressing teeth and the rotating shaft are integrally machined and formed. A cooling water cavity is formed in the rotating shaft; the part between the bottom surface of the spiral pressing tooth and the cooling water cavity is a cone-frustum-shaped spiral shaft; and the cooling water cavity is communicated with an external water inlet pipe and an external water outlet pipe. The cone-frustum-shaped rotating shaft is adopted to replace the function design of an original transmission main shaft, indirect cooling of a spiral shaft of the transmission main shaft is changed into direct cooling of the spiral shaft, the cooling wall thickness of the transmission main shaft is reduced, meanwhile, the sectional area of a cooling water cavity is increased, and the cooling effect of the spiral shaft is greatly improved; therefore, the lower pressing temperature can be kept without sacrificing the pressure of the barrel, high-pressure and low-temperature pressing in the real sense is achieved, the residual oil rate of a dry cake is reduced, and the oil outlet efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw oil presses, in particular to a cooling screw shaft and a screw cold press. Background Art

[0002] The low-temperature cold pressing process of oil is a new pressing process developed at the end of the last century and the beginning of this century. Different from the traditional high-temperature hot pressing process of the screw oil press, the low-temperature cold pressing machine must have a pressing temperature of less than 65°C during the entire pressing process from the feeding into the pressing to the separation of the pressed cake from the pressing chamber. Therefore, the low-temperature cold pressing process has the characteristics of fully retaining various nutrients, good quality of cold-pressed oil, small protein denaturation of cold-pressed cakes, high comprehensive utilization and development value, and green environmental protection and pollution-free. Therefore, the research and development of low-temperature cold pressing machines has received extensive attention and participation from scientific and technological workers at home and abroad. For example, the twin-screw oil press developed in my country came into being in the upsurge of low-temperature cold pressing machine research and development. Unfortunately, this model does not adopt any cooling design, and its pressing temperature in the pressing chamber is still as high as 90°C, which is far from the process design requirements of low-temperature cold pressing machines. The Kp series low-temperature cold press developed and manufactured by Germany's Kemreia-SKET company, although the pressing temperature of the pressing chamber meets the requirements of the low-temperature cold pressing process, the dry cake residual oil rate of the cold-pressed cake is as high as 10% to 14%. Compared with the 6% to 7% dry cake residual oil rate of the traditional high-temperature hot pressing process, its oil output efficiency is low and the oil loss is too large. If secondary pressing is adopted, the processing cost will increase, and the degree of protein denaturation in the pressed cake will also increase, reducing the development and utilization value of the protein in the pressed cake.

[0003] The reason why the Kp series low-temperature cold press is not satisfactory is that, in addition to the single cooling measure of the pressing chamber and the inadequate cooling effect, it only adopts the hollow shaft water injection cooling design for the transmission main shaft of the traditional screw oil press, without considering the cooling of the transmission main shaft and then indirectly cooling the spiral parts (such as the combined pressing parts such as the pressing screw, liner and smooth sleeve) on it. The total cooling wall thickness is too large. The wall thickness of the hollow transmission main shaft + the wall thickness of the combined pressing parts of the pressing screw is at least between 50mm and 60mm. The larger the machine model, the larger the wall thickness that needs to be cooled, and the worse the cooling effect. Therefore, the Kp series low-temperature cold press has reduced and controlled the design of the pressing chamber pressure. The pressing chamber pressure is proportional to the pressing chamber temperature and inversely proportional to the residual oil rate of the cold-pressed cake. It is this "low pressure, low temperature" design of the pressing chamber that leads to the excessively high residual oil rate and excessive oil loss of its cold-pressed biscuits. Summary of the invention

[0004] The present invention proposes a cooling spiral shaft and a spiral cold press, which solves the problem that the cold press in the prior art adopts a hollow shaft water injection cooling design for the transmission main shaft of the traditional spiral oil press, but does not take into account that the total cooling wall thickness of the spiral member indirectly cooled by cooling the transmission main shaft is too large, resulting in poor cooling effect, and ultimately the pressing temperature can only be reduced at the expense of the pressing chamber pressure, thereby resulting in an excessively high residual oil rate in the dry cake.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A first aspect of the present invention provides a cooling spiral shaft, comprising a frustoconical rotating shaft, wherein spiral pressing teeth are arranged on the outside of the rotating shaft, and the spiral pressing teeth are integrally formed with the rotating shaft; a cooling water chamber is arranged inside the rotating shaft, and the portion between the bottom surface of the spiral pressing teeth and the cooling water chamber is the frustoconical rotating shaft; the cooling water chamber is connected to an external water inlet pipe and a water outlet pipe.

[0007] Since the traditional screw shaft is composed of a number of pressing screws, linings, and smooth sleeves, and rotates with the transmission main shaft through an inner hole key connection, when the screw shaft is cooled, its cooling thickness includes the thickness of the pressing screw + the wall thickness of the transmission main shaft, and the cooling effect is poor; the present invention adopts a truncated cone-shaped rotating shaft to replace the original transmission main shaft functional design, and changes the indirect cooling screw shaft of the transmission main shaft to a direct cooling screw shaft, which not only reduces the cooling wall thickness of the transmission main shaft, but also increases the cross-sectional area of ​​the cooling water cavity, greatly improving the cooling effect of the screw shaft, thereby maintaining a low pressing temperature without sacrificing the pressing chamber pressure, realizing true high-pressure and low-temperature pressing, reducing the residual oil rate of the dry cake, and improving the oil output efficiency.

[0008] Specifically, the rotating shaft includes a power input shaft, a rotating shaft body and a rotating support shaft connected in sequence along the axial direction, the cooling water chamber is arranged inside the rotating shaft body, the spiral pressing teeth are integrally formed with the rotating shaft body; the rotating support shaft is a hollow shaft, and the shaft hole of the rotating support shaft is connected to the cooling water chamber, and the water inlet pipe and the water outlet pipe are installed at the end of the rotating support shaft. By arranging a cooling water chamber inside the rotating shaft body and introducing a cooling medium into the cooling water chamber through the shaft hole of the rotating support shaft, rapid cooling of the rotating shaft is achieved.

[0009] Furthermore, a bearing assembly is installed on the outside of the rotating support shaft, and a cover shell is seal-mounted on the outer end face of the bearing assembly; one end of the water inlet pipe is located outside the cover shell, and the other end is located inside the cover shell and extends to the inside of the cooling water chamber, and the water outlet pipe is installed on the outside of the bottom of the cover shell; by sealingly installing the cover shell on the outer end face of the bearing assembly, and installing the water inlet pipe and the water outlet pipe on the cover shell, the external low-temperature cooling medium can be introduced into the cooling water chamber through the water inlet pipe to exchange heat with the rotating shaft body, and the cooling medium after heat exchange can be discharged into the cover shell through the axial hole of the rotating support shaft, and finally discharged through the water outlet pipe at the bottom of the cover shell, thereby realizing cyclic cooling of the rotating shaft.

[0010] Furthermore, the bearing assembly includes a bearing sleeve fixedly mounted on the outside of a rotating support shaft, the outer sleeve of the bearing sleeve is provided with a roller bearing, the outer sleeve of the roller bearing is provided with a bearing seat, the front and rear ends of the bearing seat are provided with bearing covers, the open end of the cover shell is sealed and welded to the bearing cover at the front end of the bearing seat, and an oil seal element is provided between the inner side of the bearing cover and the bearing sleeve; through the mutual cooperation of the bearing sleeve, roller bearing, bearing seat, bearing cover and oil seal element, the sealing of the bearing assembly can be ensured to prevent the cooling medium from penetrating into the interior of the bearing assembly or extending out of the cover shell.

[0011] Furthermore, the roller bearing is a spherical roller bearing, and an adjusting nut is provided at the front end of the spherical roller bearing. The adjusting nut is used to adjust the axial clearance of the roller bearing to ensure the stability of the rotation of the rotating support shaft.

[0012] Furthermore, a mounting hole is provided on the side of the cover shell, a threaded joint is sealed and installed in the mounting hole, and the water inlet pipe is fixedly installed on the cover shell through the threaded joint.

[0013] Specifically, threaded holes are provided at both ends of the rotating shaft body, and the thread rotation direction of the threaded holes is opposite to that of the rotating shaft, and the power input shaft, the rotating support shaft and the rotating shaft body are connected by threads; by threading the rotating shaft body with the power input shaft and the rotating support shaft at both ends, the processing and assembly of the rotating shaft are facilitated, and the power input shaft, the rotating shaft body and the rotating support shaft can be processed separately.

[0014] Furthermore, both end faces of the rotating shaft body are provided with annular grooves, and sealing rings are embedded in the annular grooves, which can improve the sealing performance of the connection between the rotating shaft body and the power input shaft and the rotating support shaft.

[0015] Specifically, the rotating shaft body includes a feeding section and a pressing section, the root circle diameter of the feeding section is constant, the root circle diameter of the pressing section increases along the axial direction, and the cooling water chamber is opened inside the pressing section; since the volume between the pressing chamber and the rotating shaft of the feeding section is fixed, less heat is generated; while the root circle diameter of the pressing section gradually increases, resulting in a gradual decrease in the volume between the pressing chamber and the rotating shaft, and more heat is generated. Therefore, it is only necessary to open a cooling water chamber inside the pressing section for cooling.

[0016] A second aspect of the present invention provides a screw cold press, comprising a screw oil press body, wherein the screw shaft of the screw oil press body adopts the above-mentioned cooling screw shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the internal structure of a cooling spiral shaft of the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0020] Figure 3 This is a schematic diagram of the external structure of a cooling spiral shaft of the present invention;

[0021] In the figure: 1. spiral pressing teeth; 2. cooling water chamber; 3. water inlet pipe; 4. water outlet pipe; 5. power input shaft; 6. rotating shaft body; 7. rotating support shaft; 8. shaft hole; 9. cover; 10. bearing sleeve; 11. roller bearing; 12. bearing seat; 13. bearing cover; 14. oil seal element; 15. adjusting nut; 16. threaded joint; 17. threaded hole; 18. sealing ring. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Reference Figures 1 to 3A first aspect of an embodiment of the present invention provides a cooling spiral shaft, comprising a frustoconical rotating shaft, a spiral pressing tooth 1 is provided on the outside of the rotating shaft, and the spiral pressing tooth 1 is integrally formed with the rotating shaft; a cooling water chamber 2 is provided inside the rotating shaft, and the portion between the bottom surface of the spiral pressing tooth 1 and the cooling water chamber 2 is the frustoconical rotating shaft; the cooling water chamber 2 is connected to an external water inlet pipe 3 and a water outlet pipe 4.

[0024] Since the traditional screw shaft is composed of a number of pressing screws, linings, and smooth sleeves, and rotates with the transmission main shaft through an inner hole key connection, when the screw shaft is cooled, its cooling thickness includes the thickness of the pressing screw + the wall thickness of the transmission main shaft, and the cooling effect is poor; the present invention adopts a truncated cone-shaped rotating shaft to replace the original transmission main shaft functional design, and changes the indirect cooling screw shaft of the transmission main shaft to a direct cooling screw shaft, which not only reduces the cooling wall thickness of the transmission main shaft, but also increases the cross-sectional area of ​​the cooling water chamber 2, greatly improving the cooling effect of the screw shaft, thereby maintaining a low pressing temperature without sacrificing the pressing chamber pressure, realizing true high-pressure and low-temperature pressing, reducing the dry cake residual oil rate, and improving the oil output efficiency.

[0025] Specifically, Figure 1 As shown, the rotating shaft comprises a power input shaft 5, a rotating shaft body 6 and a rotating support shaft 7 which are sequentially connected in the axial direction, the cooling water chamber 2 is arranged inside the rotating shaft body 6, the spiral pressing teeth 1 are integrally formed with the rotating shaft body 6; the rotating support shaft 7 is a hollow shaft, and the shaft hole 8 of the rotating support shaft 7 is connected with the cooling water chamber 2, and the water inlet pipe 3 and the water outlet pipe 4 are installed at the end of the rotating support shaft 7. By arranging the cooling water chamber 2 inside the rotating shaft body 6 and introducing the cooling medium into the cooling water chamber 2 through the shaft hole 8 of the rotating support shaft 7, the rotating shaft can be quickly cooled.

[0026] In this embodiment, the material of the rotating shaft body 6 is 20CrMnTi, the surface is carburized and quenched, the carburized layer depth is 1.5~2mm, and the heat treatment hardness is HRc58~62; the material of the power input shaft 5 is 40Cr, which is tempered and has a hardness of HB260~310; the material of the rotating support shaft 7 is 45# seamless steel pipe, which is tempered and has a hardness of HB190~240.

[0027] Furthermore, if Figure 1As shown, a bearing assembly is installed on the outside of the rotating support shaft 7, and a cover 9 is installed on the outer end face of the bearing assembly in a sealed manner; one end of the water inlet pipe 3 is located outside the cover 9, and the other end is located inside the cover 9 and extends to the inside of the cooling water chamber 2, and the water outlet pipe 4 is installed on the outside of the bottom of the cover 9; by sealing the cover 9 on the outer end face of the bearing assembly, and installing the water inlet pipe 3 and the water outlet pipe 4 on the cover 9, the external low-temperature cooling medium can be introduced into the cooling water chamber 2 through the water inlet pipe 3 to exchange heat with the rotating shaft body 6, and the cooling medium after heat exchange is discharged into the cover 9 through the shaft hole 8 of the rotating support shaft 7, and finally discharged through the water outlet pipe 4 at the bottom of the cover 9, thereby realizing the circulation cooling of the rotating shaft. Since the cover 9 is sealed and welded on the outer end face of the bearing assembly, the cover 9 is not affected by the rotation of the rotating shaft.

[0028] During the specific implementation process, in addition to being installed on the bearing assembly through the cover 9, the water inlet pipe 3 and the water outlet pipe 4 can also be directly installed on the end of the rotating support shaft 7 with the help of a rotating joint. The structure and installation method of the rotating joint are both conventional means in the field.

[0029] Furthermore, if Figure 2 As shown, the bearing assembly includes a bearing sleeve 10 fixedly sleeved on the outside of the rotating support shaft 7, the outer sleeve of the bearing sleeve 10 is provided with a roller bearing 11, the outer sleeve of the roller bearing 11 is provided with a bearing seat 12, the front and rear ends of the bearing seat 12 are provided with bearing covers 13, the open end of the cover shell 9 is sealed and welded to the bearing cover 13 at the front end of the bearing seat 12, and an oil seal element 14 is provided between the inner side of the bearing cover 13 and the bearing sleeve 10; through the mutual cooperation of the bearing sleeve 10, the roller bearing 11, the bearing seat 12, the bearing cover 13 and the oil seal element 14, the sealing of the bearing assembly can be guaranteed to prevent the cooling medium from penetrating into the interior of the bearing assembly or extending out of the cover shell 9. During the rotation of the rotating support shaft 7, the bearing sleeve 10 rotates with the rotating support shaft 7, while the bearing seat 12 and the bearing covers 13 at the front and rear ends thereof are fixed. The bearing seat 12 and the bearing sleeve 10 are rotationally connected via the roller bearing 11, and the bearing covers 13 at both ends of the bearing seat 12 cooperate with the oil seal elements 14 to seal the bearing assembly.

[0030] Furthermore, if Figure 2 As shown, the roller bearing 11 is a spherical roller bearing 11 , and an adjusting nut 15 is provided at the front end of the spherical roller bearing 11 . The adjusting nut 15 is used to adjust the axial clearance of the roller bearing 11 to ensure the rotation stability of the rotating support shaft 7 .

[0031] Furthermore, if Figure 1 , 3As shown, a mounting hole is provided on the side of the housing 9 , a threaded joint 16 is sealed and installed in the mounting hole, and the water inlet pipe 3 is fixedly installed on the housing 9 through the threaded joint 16 .

[0032] Specifically, Figure 1 As shown, threaded holes 17 are provided at both ends of the rotating shaft body 6, and the threaded direction of the threaded hole 17 is opposite to that of the rotating shaft, and the power input shaft 5, the rotating support shaft 7 and the rotating shaft body 6 are connected by threads; by threading the rotating shaft body 6 with the power input shaft 5 and the rotating support shaft 7 at both ends, the processing and assembly of the rotating shaft are facilitated, and the power input shaft 5, the rotating shaft body 6 and the rotating support shaft 7 can be processed separately.

[0033] Furthermore, if Figure 1 As shown, both end faces of the rotating shaft body 6 are provided with annular grooves, and sealing rings 18 are embedded in the annular grooves to improve the sealing performance of the connection between the rotating shaft body 6 and the power input shaft 5 and the rotating support shaft 7.

[0034] Specifically, the rotating shaft body 6 includes a feeding section and a pressing section, the root circle diameter of the feeding section is constant, the root circle diameter of the pressing section increases along the axial direction, and the cooling water chamber 2 is opened inside the pressing section; since the volume between the pressing chamber and the rotating shaft of the feeding section is fixed, less heat is generated; and since the root circle diameter of the pressing section gradually increases, the volume between the pressing chamber and the rotating shaft gradually decreases, and more heat is generated. Therefore, it is only necessary to open a cooling water chamber 2 inside the pressing section for cooling.

[0035] Preferably, spiral guide blades (not shown in the figure, similar to the mixing blades arranged on the inner wall of a concrete mixing tank) can be provided on the inner wall of the cooling water chamber 2 and the inner wall of the shaft hole 8. On the one hand, the cooling medium in the cooling water chamber 2 can be discharged into the cover shell 9 through the rotation of the spiral guide blades in cooperation with the spiral shaft, thereby improving the circulation efficiency of the cooling medium in the cooling water chamber 2, thereby improving the heat exchange efficiency; on the other hand, the spiral guide blades greatly increase the contact area between the cooling medium and the spiral shaft, thereby further improving the heat exchange efficiency.

[0036] When designing the rotating shaft body 6 of this embodiment, the cross-sectional area between the root circle of the rotating shaft body 6 and the cooling water chamber 2 can be adjusted to be slightly larger than or equal to the cross-sectional area of ​​the corresponding part of the original transmission shaft. In this way, while ensuring the structural reliability of the rotating shaft body 6, the cross-sectional area of ​​the cooling water chamber 2 can be increased as much as possible, thereby maximizing the cooling effect of the screw shaft.

[0037] A second aspect of an embodiment of the present invention provides a spiral cold press, comprising a spiral oil press body, wherein the spiral shaft of the spiral oil press body adopts the above-mentioned cooling spiral shaft.

[0038] The working process of the cooling spiral shaft of the present invention is as follows:

[0039] The spiral shaft rotates in the pressing chamber, and is squeezed and rubbed against the blanks in the pressing chamber, generating a large amount of heat; the cooling medium is introduced into the cooling water chamber 2 inside the rotating shaft body 6 through the water inlet pipe 3, and the cooling medium directly exchanges heat with the rotating shaft body 6 to absorb the heat of the rotating shaft body 6, and as the rotating shaft body 6 rotates, the cooling medium will cover the entire inner wall of the cooling water chamber 2, quickly reducing the temperature of the rotating shaft body 6; the cooling medium after heat exchange flows into the cover shell 9 through the shaft hole 8 of the rotating support shaft 7, and finally flows out from the water outlet pipe 4 at the bottom of the cover shell 9, thereby realizing circulating water cooling of the spiral shaft.

[0040] The screw shaft of the traditional screw oil press is a combination of a transmission shaft and a plurality of screw components with different pitches, several bushings and smooth sleeves connected by keys. Although a cooling design is adopted for the transmission shaft, the wall thickness of the water-passing part of the transmission shaft plus the wall thickness of the assembly parts such as the screw is about 60 mm in total. With such a large thickness, the cooling effect is average. However, since the present invention omits the traditional hollow transmission shaft, the cooling thickness of the screw shaft is reduced by about 50%, and the cooling area of ​​the cooling water is increased, so the cooling effect is significantly improved, which wins a certain space for further increasing the pressing chamber pressure, reducing the residual oil rate of the dry cake, and reducing the oil loss.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling spiral shaft, characterized in that: The invention comprises a truncated cone-shaped rotating shaft, wherein a spiral pressing tooth (1) is arranged outside the rotating shaft, and the spiral pressing tooth (1) and the rotating shaft are integrally formed; a cooling water chamber (2) is arranged inside the rotating shaft, and the portion between the bottom surface of the spiral pressing tooth (1) and the cooling water chamber (2) is the truncated cone-shaped rotating shaft; and the cooling water chamber (2) is connected to an external water inlet pipe (3) and a water outlet pipe (4).

2. A cooling spiral shaft according to claim 1, characterized in that: The rotating shaft comprises a power input shaft (5), a rotating shaft body (6) and a rotating support shaft (7) which are connected in sequence along the axial direction; the cooling water chamber (2) is arranged inside the rotating shaft body (6); the spiral pressing teeth (1) and the rotating shaft body (6) are integrally formed; the rotating support shaft (7) is a hollow shaft, and the shaft hole (8) of the rotating support shaft (7) is connected to the cooling water chamber (2); the water inlet pipe (3) and the water outlet pipe (4) are installed at the ends of the rotating support shaft (7).

3. A cooling spiral shaft according to claim 2, characterized in that: A bearing assembly is installed on the outside of the rotating support shaft (7), and a cover shell (9) is installed in a sealing manner on the outer end surface of the bearing assembly; one end of the water inlet pipe (3) is located outside the cover shell (9), and the other end is located inside the cover shell (9) and extends to the inside of the cooling water chamber (2); the water outlet pipe (4) is installed on the outside of the bottom of the cover shell (9).

4. A cooling spiral shaft as claimed in claim 3, characterized in that: The bearing assembly comprises a bearing sleeve (10) fixedly sleeved on the outside of a rotating support shaft (7); a roller bearing (11) is sleeved on the outside of the bearing sleeve (10); a bearing seat (12) is sleeved on the outside of the roller bearing (11); a bearing cover (13) is provided at the front and rear ends of the bearing seat (12); an open end of the cover shell (9) is sealed and welded to the bearing cover (13) at the front end of the bearing seat (12); and an oil seal element (14) is provided between the inner side of the bearing cover (13) and the bearing sleeve (10).

5. A cooling spiral shaft as claimed in claim 4, characterized in that: The roller bearing (11) is a spherical roller bearing (11), and an adjusting nut (15) is provided at the front end of the spherical roller bearing (11). The adjusting nut (15) is used to adjust the axial clearance of the roller bearing (11).

6. A cooling spiral shaft as claimed in claim 3, characterized in that: A mounting hole is provided on the side of the housing (9), a threaded joint (16) is sealed and installed in the mounting hole, and the water inlet pipe (3) is fixedly installed on the housing (9) via the threaded joint (16).

7. A cooling spiral shaft as claimed in claim 2, characterized in that: Both ends of the rotating shaft body (6) are provided with threaded holes (17), and the threaded direction of the threaded holes (17) is opposite to that of the rotating shaft. The power input shaft (5), the rotating support shaft (7) and the rotating shaft body (6) are connected by threads.

8. A cooling spiral shaft according to claim 7, characterized in that: Both end surfaces of the rotating shaft body (6) are provided with annular grooves, and sealing rings (18) are embedded in the annular grooves.

9. A cooling spiral shaft as claimed in claim 2, characterized in that: The rotating shaft body (6) comprises a feeding section and a pressing section, the feeding section has a constant root circle diameter, the pressing section has a root circle diameter that increases axially, and the cooling water chamber (2) is opened inside the pressing section.

10. A screw cold press, comprising a screw oil press body, characterized in that: The screw shaft of the screw oil press body adopts the cooling screw shaft as described in any one of claims 1 to 9.

Images