Spiral cold pressing machine for whole-course low-temperature pressing operation in pressing chamber and pressing chamber cooling method

Abstract

The invention provides a spiral cold pressing machine for whole-course low-temperature pressing operation in a pressing frame, a pressing cage of the cold pressing machine comprises a plurality of cage mounting plates which are arranged at intervals in the axial direction, and the edges of the two opposite sides of each cage mounting plate are fixedly connected through a first connecting plate and a second connecting plate respectively; a heat exchange channel is arranged on the inner wall of an inner hole of the caging plate in the circumferential direction, a plurality of pressing strips are adjacently arranged on the side wall of the heat exchange channel in the circumferential direction, and a pressing chamber is defined by the pressing strips; the heat exchange channel is communicated with an external circulation pipeline through a corresponding flow channel; a spiral shaft of the cold pressing machine comprises a cone-frustum-shaped rotating shaft, spiral pressing teeth are arranged outside 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, and the part between the bottom face of the spiral pressing tooth and the cooling water cavity is a cone-frustum-shaped rotating shaft. By designing the pressing cage water cooling structure and the spiral shaft water cooling structure, the pressing cage and the spiral shaft are subjected to water cooling at the same time in the working process, high-pressure low-temperature pressing in the real sense is achieved, and the oil outlet quality and the oil outlet efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw oil presses, and in particular to a screw cold press with low-temperature pressing throughout the entire process in a pressing chamber and a pressing chamber cooling method. 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.

[0004] The screw oil press mainly uses the rotation of the screw shaft to gradually reduce the volume of the oil in the pressing chamber and generate a large pressure due to various resistances to press the oil. Therefore, the friction resistance between the screw shaft and the pressed oil, and between the pressed oil and the pressing chamber will inevitably generate a large amount of heat, which is an important factor affecting the lack of major breakthroughs in the research and development of low-temperature cold press technology in my country since 2002; therefore, how to improve the current "low pressure, low temperature" working conditions to "high pressure, low temperature" working conditions, the research and development of the pressing cage and screw shaft cooling design has become the key to the problem. Summary of the invention

[0005] The present invention provides a spiral cold press machine and a pressing chamber cooling method that operate with low temperature pressing throughout the entire pressing process, which solves the problems that the cold press machine in the prior art only adopts a hollow shaft water injection cooling design for the transmission main shaft of the traditional spiral oil press, resulting in poor cooling effect.

[0006] The technical solution of the present invention is achieved in this way:

[0007] The first aspect of the present invention provides a screw cold press that operates with low temperature pressing in the pressing box, comprising a frame, a controller, a driving component and a pressing cage are installed on the frame, a feeding hopper is installed at the feeding end of the pressing cage, and a single screw shaft or multiple screw shafts are installed in the pressing cage;

[0008] The pressing cage comprises a plurality of cage plates arranged at intervals along the axial direction, and the opposite side edges of the plurality of cage plates are fixedly connected by a first connecting plate and a second connecting plate respectively; a heat exchange channel is provided on the inner wall of the inner hole of the cage plate along the circumferential direction, and a plurality of pressing bars are arranged adjacent to the side wall of the heat exchange channel along the circumferential direction, and the plurality of pressing bars are surrounded to form a pressing chamber; the heat exchange channel is connected to the external circulation pipeline through a corresponding flow channel;

[0009] The spiral shaft includes a frustoconical rotating shaft, a spiral pressing tooth is arranged on the outside of the rotating shaft, and the spiral pressing tooth and the rotating shaft are integrally formed; a cooling water chamber is arranged inside the rotating shaft, and the part between the bottom surface of the spiral pressing tooth and the cooling water chamber is the frustoconical rotating shaft; the cooling water chamber is connected to an external first water inlet pipe and a first water outlet pipe.

[0010] Optionally, the heat exchange channel includes a cooling water tank, a heat exchange tube is embedded in the cooling water tank, a plurality of the pressing strips are arranged closely along the circumference of the side wall of the heat exchange tube, and the heat exchange tube is connected to the external circulation pipeline through a corresponding flow channel.

[0011] Preferably, the heat exchange channel comprises a cooling water trough, a sealing sleeve is welded on the opening side of the cooling water trough, a plurality of the pressing strips are arranged closely along the circumference of the side wall of the sealing sleeve, and the cooling water trough is connected to the external circulation pipeline through a corresponding flow channel.

[0012] Preferably, the external circulation pipeline includes a diverter pipe and a collecting pipe, and the diverter pipe and the collecting pipe are respectively installed on the first connecting plate and the second connecting plate; the diverter pipe is connected with the heat exchange channel of each cage plate through the corresponding first flow channel, and the collecting pipe is connected with the heat exchange channel of each cage plate through the corresponding second flow channel, and the diverter pipe and the collecting pipe are respectively connected with the second water inlet pipe and the second water outlet pipe; a low-temperature cooling medium is introduced into the diverter pipe through the second water inlet pipe, and the cooling medium is diverted by the diverter pipe and enters the heat exchange channel with the first flow channel of each cage plate to exchange heat with the pressing bars in the pressing chamber, and then is collected into the collecting pipe through the second flow channel of each cage plate, and finally is discharged from the second water outlet pipe. By connecting the circulation pipelines of the heat exchange channels of multiple cage plates in parallel, the pipeline layout cost can be saved, the pipeline layout space can be reduced, and on-site installation and use are convenient.

[0013] Optionally, the external circulation pipeline includes several groups of independent second water inlet pipes and second water outlet pipes, and each group of the second water inlet pipes and the second water outlet pipes are respectively connected to the heat exchange channels of the corresponding caged plates through the first flow channel and the second flow channel; by independently setting the circulation pipelines of the heat exchange channels of each caged plate, the medium temperature, flow rate and other parameters of each circulation pipeline can be independently adjusted to accurately control the temperature of different parts in the pressing chamber.

[0014] Optionally, the cage plate is composed of two semi-annular plates, and the two semi-annular plates are detachably connected via a connecting piece. This detachable cage plate structure is more suitable for installation in large and medium-sized machines.

[0015] Specifically, a pressure plate is fixedly installed at both ends of the inner hole of each semi-annular plate, and several pressing strips are arranged closely between the two pressing plates. Through the pressure plates at both ends, several pressing strips can be tightly pressed onto the inner wall of the sealing sleeve corresponding to the inner hole of the semi-annular plate.

[0016] Furthermore, the heat exchange channel and the sealing sleeve are both two-section split structures, and both end openings of the heat exchange channel are provided with sealing plugs; the first connecting plate, the second connecting plate, the diverter pipe, the water collecting pipe, the first flow channel, and the second flow channel are each provided with two groups, which are respectively used for circulating water through the heat exchange channels inside the two semi-annular plates; since pressure plates are installed at both ends of the inner holes of the semi-annular plates, the original integral annular heat exchange channel and the sealing sleeve are separated into two independent structures by the pressure plate. Therefore, by setting two groups of independent circulation pipelines, the cooling medium is respectively introduced into the heat exchange channels in the two semi-annular plates, thereby realizing the circulation cooling of the split cage plate.

[0017] Specifically, the connecting parts include bolts, pins and ear plates, and the sides of the two first connecting plates and the second connecting plates are provided with through holes for installing bolts; ear plates are respectively installed at both ends of the bottom surfaces of the two second connecting plates, and the pins pass through the axial holes of the four ear plates in sequence; the two second connecting plates at the bottom ends of the two semi-annular plates are hinged by ear plates and pins, so as to facilitate automatic alignment of the two semi-annular plates when closed, and the two first connecting plates at the upper part of the two semi-annular plates are locked by bolts, and the two second connecting plates at the lower part of the two semi-annular plates are locked by bolts to achieve locking and fixation of the two semi-annular plates.

[0018] Furthermore, a notch is provided at the position where the water collecting pipe passes through the ear plate, and the notch is seal-welded to the ear plate, so as to avoid the ear plate affecting the layout path of the water collecting pipe without affecting the sealing of the water collecting pipe.

[0019] Furthermore, the bolt is installed at a position between two adjacent cage plates on the first connecting plate and between two adjacent cage plates on the second connecting plate, and the penetration path of the bolt is staggered with the first flow channel in the first connecting plate and the second flow channel in the second connecting plate, thereby avoiding the influence of the installation of the bolt on the first flow channel and the second flow channel.

[0020] 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 first water inlet pipe and the first 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.

[0021] 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 first 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 first 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 first water inlet pipe and the first water outlet pipe on the cover shell, the external low-temperature cooling medium can be introduced into the cooling water chamber through the first 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 first water outlet pipe at the bottom of the cover shell, thereby realizing cyclic cooling of the rotating shaft.

[0022] 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.

[0023] 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.

[0024] 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 first water inlet pipe is fixedly installed on the cover shell through the threaded joint.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] A second aspect of the present invention provides a method for cooling a pressing chamber, comprising the following steps:

[0029] Real-time monitoring of operating temperature data in the pressing chamber;

[0030] According to the monitored temperature data, the external circulation pipeline is controlled to circulate the cooling medium into the heat exchange channel of the cage plate, and the first water inlet pipe and the first water outlet pipe are controlled to circulate the cooling medium into the cooling water cavity inside the spiral shaft;

[0031] The higher the operating temperature in the press chamber, the greater the flow rate and faster the flow rate of the cooling medium circulation.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] (1) The present invention sets a heat exchange channel on the inner wall of the inner hole of the cage plate. When working, a cooling medium is circulated into the heat exchange channel through an external circulation pipeline. The heat on the pressing bar is transferred to the heat exchange channel and then taken away by the cooling medium, thereby quickly reducing the pressing temperature in the pressing chamber, realizing the design concept of "low temperature and high pressure" in the pressing chamber, and realizing low-temperature pressing in the true sense. Under the premise of ensuring the quality of the oil and low denaturation of protein in the cake, the oil output efficiency is maximized;

[0034] (2) 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, 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, and improving the oil output quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 It is a schematic diagram of the overall structure of the spiral cold press in the present invention;

[0037] Figure 2 This is a schematic diagram of the internal structure of the integrated cage plate in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the internal structure of the split cage plate in an embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure after the split cage plate is opened in the embodiment of the present invention;

[0040] Figure 5 This is a front view of a pressing cage in an embodiment of the present invention;

[0041] Figure 6 A top view of a pressing cage in an embodiment of the present invention;

[0042] Figure 7 A bottom view of a pressing cage in an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of the internal structure of the spiral shaft in an embodiment of the present invention;

[0044] Fig. 9 for Figure 8 Enlarged view of part A in the middle;

[0045] Fig.10 Schematic diagram of the external structure of the spiral shaft in an embodiment of the present invention;

[0046] In the figure: 1, frame; 2, controller; 3, driving component; 4, pressing cage; 5, feeding hopper; 6, cage plate; 7, first connecting plate; 8, second connecting plate; 9, cooling water tank; 10, sealing sleeve; 11, pressing bar; 12, diverter pipe; 13, water collecting pipe; 14, first flow channel; 15, second flow channel; 16, second water inlet pipe; 17, second water outlet pipe; 18, semi-circular plate; 19, pressing plate; 20, sealing plug; 21, bolt; 22, pin Shaft; 23, ear plate; 24, notch; 25, spiral pressing teeth; 26, cooling water chamber; 27, first water inlet pipe; 28, first water outlet pipe; 29, power input shaft; 30, rotating shaft body; 31, rotating support shaft; 32, shaft hole; 33, cover; 34, bearing sleeve; 35, roller bearing; 36, bearing seat; 37, bearing cover; 38, oil seal element; 39, adjusting nut; 40, threaded joint; 41, threaded hole; 42, sealing ring. DETAILED DESCRIPTION

[0047] 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.

[0048] Reference Figures 1 to 10 The first aspect of the embodiment of the present invention provides a screw cold press machine that operates at low temperature throughout the pressing process in a pressing box, comprising a frame 1, on which a controller 2, a driving component 3 and a pressing cage 4 are installed, a feeding hopper 5 is installed at the feeding end of the pressing cage 4, and a single screw shaft or multiple screw shafts are installed in the pressing cage 4;

[0049] The pressing cage 4 comprises a plurality of cage plates 6 arranged at intervals along the axial direction, and the opposite side edges of the plurality of cage plates 6 are fixedly connected by a first connecting plate 7 and a second connecting plate 8 respectively; a heat exchange channel is provided on the inner wall of the inner hole of the cage plate 6 along the circumferential direction, and a plurality of pressing bars 11 are arranged adjacent to the side wall of the heat exchange channel along the circumferential direction, and the plurality of pressing bars 11 are surrounded to form a pressing chamber; the heat exchange channel is connected to the external circulation pipeline through a corresponding flow channel;

[0050] The spiral shaft includes a truncated cone-shaped rotating shaft, a spiral pressing tooth 25 is provided on the outside of the rotating shaft, and the spiral pressing tooth 25 is integrally formed with the rotating shaft; a cooling water chamber 26 is provided inside the rotating shaft, and the portion between the bottom surface of the spiral pressing tooth 25 and the cooling water chamber 26 is the truncated cone-shaped rotating shaft; the cooling water chamber 26 is connected to an external first water inlet pipe 27 and a first water outlet pipe 28.

[0051] In the specific implementation process, a number of temperature sensors are installed on the pressing cage 4, which can be installed on the cage plate 6 and the pressing bar 11. The temperature of the oil in the pressing bore is indirectly measured by monitoring the temperature of the cage plate 6 and the pressing bar 11. The controller 2 performs circulating water cooling on the pressing cage 4 and the screw shaft according to the monitored temperature data to ensure that the oil is in a low-temperature pressing environment. The driving component 3 includes a motor and a reducer, and the motor drives the reducer to drive the screw shaft to rotate, and cooperates with the pressing bore to realize the transportation and extrusion of the oil.

[0052] Optionally, the heat exchange channel includes a cooling water tank 9, in which a heat exchange tube (not shown) is embedded, and a plurality of the pressing strips 11 are arranged closely along the circumference of the side wall of the heat exchange tube, and the heat exchange tube is connected to the external circulation pipeline through a corresponding flow channel.

[0053] Preferably, if Figure 2 As shown, the heat exchange channel includes a cooling water trough 9, a sealing sleeve 10 is welded on the open side of the cooling water trough 9, a plurality of pressing strips 11 are arranged closely along the circumference of the side wall of the sealing sleeve 10, and the cooling water trough 9 is connected to the external circulation pipeline through the corresponding flow channel.

[0054] In this embodiment, a closed annular heat exchange channel is obtained by opening a cooling water tank 9 on the inner wall of the inner hole of the cage plate 6 and welding a sealing sleeve 10. In the specific implementation process, it is not limited to the method of embedding a heat exchange copper tube in the cooling water tank 9. A cooling medium can be circulated in the heat exchange copper tube to achieve rapid cooling of the pressing chamber.

[0055] The sealing sleeve 10 in this embodiment is made of a metal material having welding performance similar to that of the cage plate 6, and the thickness of the sealing sleeve 10 is not easy to be too thick (too thick will lead to reduced heat transfer efficiency); the width of the sealing sleeve 10 is greater than the width of the cooling water trough 9, thereby ensuring the welding sealing effect.

[0056] During the specific implementation process, the cooling water tank 9 is not limited to the processing method, and its cross section is not limited to being designed as a semicircular, rectangular or other shapes; the cooling medium is not limited to using water, cooling oil or other heat-conducting media.

[0057] In this embodiment, cooling water grooves 9 can be set in all cage plates 6 along the entire axial length of the pressing cage 4 to achieve full cooling of the pressing cage 4 along the axial length, and cooling water grooves 9 can also be set in part of the cage plates 6 along the axial length of the pressing cage 4 to achieve local cooling of the pressing cage 4 along the axial length.

[0058] Preferably, if Figures 2 to 4 As shown, the external circulation pipeline includes a shunt pipe 12 and a water collecting pipe 13, and the shunt pipe 12 and the water collecting pipe 13 are respectively installed on the first connecting plate 7 and the second connecting plate 8; the shunt pipe 12 is respectively connected to the cooling water tank 9 of each cage plate 6 through the corresponding first flow channel 14, and the water collecting pipe 13 is respectively connected to the cooling water tank 9 of each cage plate 6 through the corresponding second flow channel 15, and the shunt pipe 12 and the water collecting pipe 13 are respectively connected to the second water inlet pipe 16 and the second water outlet pipe 17; through the second The water inlet pipe 16 introduces a low-temperature cooling medium into the diversion pipe 12. After being diverted by the diversion pipe 12, the cooling medium enters the cooling water trough 9 through the first flow channels 14 of each cage plate 6 to exchange heat with the pressing bars 11 in the pressing chamber, and then passes through the second flow channels 15 of each cage plate 6 to be collected into the collecting pipe 13, and finally discharged from the second water outlet pipe 17. By connecting the circulation pipelines of the cooling water troughs 9 of multiple cage plates 6 in parallel, the pipeline layout cost can be saved, the pipeline layout space can be reduced, and on-site installation and use can be facilitated.

[0059] In this embodiment, Figures 2 to 4 As shown, the first connecting plate 7 is located at the upper part of the cage plate 6, and the second connecting plate 8 is located at the lower part of the cage plate 6. The first connecting plate 7 and the second connecting plate 8 can be cast or welded integrally with the cage plate 6. The first flow channel 14 penetrates from the top surface of the first connecting plate 7 to the cooling water trough 9 inside the cage plate 6, and the second flow channel 15 penetrates from the bottom surface of the second connecting plate 8 to the cooling water trough 9 inside the cage plate 6.

[0060] Furthermore, in this embodiment, if Figures 2 to 4 As shown, the cross-sections of the diverter pipe 12 and the water collecting pipe 13 are semicircular, which can well adapt to the surface shapes of the first connecting plate 7 and the second connecting plate 8; during the specific implementation process, the cross-sectional shapes can also be flexibly selected according to actual conditions.

[0061] In the present embodiment, the diverter pipe 12 and the water collecting pipe 13 are obtained by axially cutting a circular tube from the end face. The side edge of the diverter pipe 12 is sealed and welded to the top surface of the first connecting plate 7 to form a semicircular tube cavity, and the inlets of all the first flow channels 14 on the top surface of the first connecting plate 7 are all connected in parallel in the semicircular tube cavity corresponding to the diverter pipe 12; the side edge of the water collecting pipe 13 is sealed and welded to the bottom surface of the second connecting plate 8 to form a semicircular tube cavity, and the outlets of all the second flow channels 15 on the bottom surface of the second connecting plate 8 are all connected in parallel in the semicircular tube cavity corresponding to the water collecting pipe 13; plugs are welded at both ends of the diverter pipe 12 and the water collecting pipe 13.

[0062] Optionally, the external circulation pipeline includes several groups of independent second water inlet pipes 16 and second water outlet pipes 17, and each group of the second water inlet pipes 16 and the second water outlet pipes 17 are respectively connected to the cooling water trough 9 of the corresponding cage plate 6 through the first flow channel 14 and the second flow channel 15; by independently setting the circulation pipelines of the cooling water troughs 9 of each cage plate 6, the medium temperature, flow rate and other parameters of each circulation pipeline can be independently adjusted to accurately control the temperature of different parts in the pressing chamber.

[0063] Alternatively, if Figure 3 , 4 As shown, the cage plate 6 is composed of two semi-annular plates 18, and the two semi-annular plates 18 are detachably connected by a connecting piece. This detachable cage plate 6 structure is more suitable for the installation of large and medium-sized machines.

[0064] The cage plate 6 of the present embodiment may adopt an integral structure that cannot be opened and closed. When the cage plate 6 is an integral structure, the cooling water groove 9 inside it is a continuous annular groove, and there is no need to use a sealing plug 20; the cage plate 6 of the present embodiment may also adopt an openable and closable split structure. When the cage plate 6 is a split structure, the cooling water groove 9 inside it is two sections of discontinuous semi-annular grooves. If the two ends of the semi-annular groove pass through the open and closed end faces of the semi-annular plate 18, it is necessary to weld sealing plugs 20 at both ends of the semi-annular groove for sealing. If the two ends of the semi-annular groove do not pass through the open and closed end faces of the semi-annular plate 18, there is no need to weld sealing plugs 20 at both ends of the semi-annular groove for sealing.

[0065] Specifically, Figure 3 , 4 As shown, a pressure plate 19 is fixedly installed at both ends of the inner hole of each semi-annular plate 18, and a plurality of pressing strips 11 are arranged closely between the two pressing plates 19. The pressing plates 19 at both ends can tightly press the plurality of pressing strips 11 onto the inner wall of the sealing sleeve 10 corresponding to the inner hole of the semi-annular plate 18.

[0066] Furthermore, if Figure 3 , 4As shown, the cooling water trough 9 and the sealing sleeve 10 are both two-section split structures, and the openings at both ends of the cooling water trough 9 are provided with sealing plugs 20; the first connecting plate 7, the second connecting plate 8, the diverter pipe 12, the water collecting pipe 13, the first flow channel 14, and the second flow channel 15 are each provided with two groups, which are respectively used for circulating water in the cooling water troughs 9 inside the two semi-annular plates 18; since pressure plates 19 are installed at both ends of the inner hole of the semi-annular plate 18, the original integral annular cooling water trough 9 and the sealing sleeve 10 are separated into two independent structures by the pressure plate 19. Therefore, by setting two groups of independent circulation pipelines, the cooling medium is respectively introduced into the cooling water troughs 9 in the two semi-annular plates 18, so as to realize the circulation cooling of the split cage plate 6.

[0067] Specifically, Figures 3 to 7 As shown, the connecting parts include bolts 21, pins 22 and ear plates 23. The sides of the two first connecting plates 7 and the second connecting plates 8 are provided with through holes for installing the bolts 21; the two ends of the bottom surfaces of the two second connecting plates 8 are respectively installed with ear plates 23, and the pins 22 pass through the axial holes 32 of the four ear plates 23 in sequence; the two second connecting plates 8 at the bottom ends of the two semi-annular plates 18 are hinged by the ear plates 23 and the pins 22, so as to facilitate the automatic alignment of the two semi-annular plates 18 when they are closed, and the two first connecting plates 7 at the upper part of the two semi-annular plates 18 are locked by bolts 21, and the two second connecting plates 8 at the lower part of the two semi-annular plates 18 are locked by bolts 21, so as to realize the locking and fixation of the two semi-annular plates 18.

[0068] Furthermore, if Figure 7 As shown, the water collecting pipe 13 is provided with a notch 24 at the position where the ear plate 23 passes, and the notch 24 is sealed and welded to the ear plate 23, so as to avoid the ear plate 23 affecting the layout path of the water collecting pipe 13 without affecting the sealing of the water collecting pipe 13.

[0069] Furthermore, if Figures 5 to 7 As shown, the bolt 21 is installed at a position between two adjacent cage plates 6 on the first connecting plate 7 and between two adjacent cage plates 6 on the second connecting plate 8. The penetration path of the bolt 21 is staggered with the first flow channel 14 in the first connecting plate 7 and the second flow channel 15 in the second connecting plate 8, so as to avoid the influence of the installation of the bolt 21 on the first flow channel 14 and the second flow channel 15.

[0070] During the specific implementation process, the internal structure of the pressing cage 4 of this embodiment can be adaptively adjusted according to the number of spiral shafts to adapt to the cooling of the pressing cage 4 of the multi-spiral cold press; the pressing cage 4 of this embodiment is not limited to being used with a single spiral shaft or a double spiral shaft.

[0071] Specifically, Figure 8As shown, the rotating shaft comprises a power input shaft 29, a rotating shaft body 30 and a rotating support shaft 31 which are sequentially connected in the axial direction, the cooling water chamber 26 is arranged inside the rotating shaft body 30, the spiral pressing teeth 25 are integrally formed with the rotating shaft body 30; the rotating support shaft 31 is a hollow shaft, and the shaft hole 32 of the rotating support shaft 31 is connected with the cooling water chamber 26, and the first water inlet pipe 27 and the first water outlet pipe 28 are installed at the end of the rotating support shaft 31. By arranging the cooling water chamber 26 inside the rotating shaft body 30 and passing the cooling medium into the cooling water chamber 26 through the shaft hole 32 of the rotating support shaft 31, the rotating shaft is rapidly cooled.

[0072] In this embodiment, the material of the rotating shaft body 30 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 29 is 40Cr, which is tempered and has a hardness of HB260~310; the material of the rotating support shaft 31 is 45# seamless steel pipe, which is tempered and has a hardness of HB190~240.

[0073] Furthermore, if Figure 8 As shown, a bearing assembly is installed on the outside of the rotating support shaft 31, and a cover 33 is installed on the outer end face of the bearing assembly in a sealed manner; one end of the first water inlet pipe 27 is located outside the cover 33, and the other end is located inside the cover 33 and extends to the inside of the cooling water chamber 26, and the first water outlet pipe 28 is installed on the outside of the bottom of the cover 33; by sealing the cover 33 on the outer end face of the bearing assembly, and installing the first water inlet pipe 27 and the first water outlet pipe 28 on the cover 33, the external low-temperature cooling medium can be introduced into the cooling water chamber 26 through the first water inlet pipe 27 to exchange heat with the rotating shaft body 30, and the cooling medium after heat exchange is discharged into the cover 33 through the shaft hole 32 of the rotating support shaft 31, and finally discharged through the first water outlet pipe 28 at the bottom of the cover 33, thereby realizing the circulation cooling of the rotating shaft. Since the cover 33 is sealed and welded on the outer end face of the bearing assembly, the cover 33 is not affected by the rotation of the rotating shaft.

[0074] During the specific implementation process, in addition to being installed on the bearing assembly through the cover 33, the first water inlet pipe 27 and the first water outlet pipe 28 can also be directly installed on the end of the rotating support shaft 31 with the help of a rotating joint. The structure and installation method of the rotating joint are both conventional means in the field.

[0075] Furthermore, if Fig. 9As shown, the bearing assembly includes a bearing sleeve 34 fixedly sleeved on the outside of the rotating support shaft 31, the outer sleeve of the bearing sleeve 34 is provided with a roller bearing 35, the outer sleeve of the roller bearing 35 is provided with a bearing seat 36, the front and rear ends of the bearing seat 36 are provided with bearing covers 37, the open end of the cover shell 33 is sealed and welded to the bearing cover 37 at the front end of the bearing seat 36, and an oil seal element 38 is provided between the inner side of the bearing cover 37 and the bearing sleeve 34; through the mutual cooperation of the bearing sleeve 34, the roller bearing 35, the bearing seat 36, the bearing cover 37 and the oil seal element 38, 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 33. During the rotation of the rotating support shaft 31, the bearing sleeve 34 rotates with the rotating support shaft 31, while the bearing seat 36 and the bearing covers 37 at its front and rear ends are fixed. The bearing seat 36 and the bearing sleeve 34 are rotationally connected through the roller bearing 35, and the bearing covers 37 at both ends of the bearing seat 36 cooperate with the oil seal elements 38 to seal the bearing assembly.

[0076] Furthermore, if Fig. 9 As shown, the roller bearing 35 is a spherical roller bearing 35 , and an adjusting nut 39 is provided at the front end of the spherical roller bearing 35 . The adjusting nut 39 is used to adjust the axial clearance of the roller bearing 35 to ensure the stability of the rotation of the rotating support shaft 31 .

[0077] Furthermore, if Figure 8 , 10 As shown, a mounting hole is provided on the side of the cover shell 33 , and a threaded joint 40 is sealed and installed in the mounting hole. The first water inlet pipe 27 is fixedly installed on the cover shell 33 through the threaded joint 40 .

[0078] Specifically, Figure 8 As shown, threaded holes 41 are provided at both ends of the rotating shaft body 30, and the threaded direction of the threaded hole 41 is opposite to that of the rotating shaft, and the power input shaft 29, the rotating support shaft 31 and the rotating shaft body 30 are connected by threads; by threading the rotating shaft body 30 with the power input shaft 29 and the rotating support shaft 31 at both ends, the processing and assembly of the rotating shaft are facilitated, and the power input shaft 29, the rotating shaft body 30 and the rotating support shaft 31 can be processed separately.

[0079] Furthermore, if Figure 8 As shown, both end faces of the rotating shaft body 30 are provided with annular grooves, and sealing rings 42 are embedded in the annular grooves to improve the sealing performance of the connection between the rotating shaft body 30 and the power input shaft 29 and the rotating support shaft 31.

[0080] Specifically, the rotating shaft body 30 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 26 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 26 inside the pressing section for cooling.

[0081] Preferably, spiral guide blades (not shown in the figure, similar to the mixing blades provided on the inner wall of a concrete mixing tank) can be provided on the inner wall of the cooling water chamber 26 and the inner wall of the shaft hole 32. On the one hand, the cooling medium in the cooling water chamber 26 can be discharged into the cover shell 33 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 26, 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.

[0082] When designing the rotating shaft body 30 of this embodiment, the cross-sectional area between the root circle of the rotating shaft body 30 and the cooling water chamber 26 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 30, the cross-sectional area of ​​the cooling water chamber 26 can be increased as much as possible, thereby maximizing the cooling effect of the screw shaft.

[0083] 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.

[0084] A second aspect of an embodiment of the present invention provides a method for cooling a pressing chamber, comprising the following steps:

[0085] Real-time monitoring of operating temperature data in the pressing chamber;

[0086] According to the monitored temperature data, the external circulation pipeline is controlled to circulate the cooling medium into the heat exchange channel of the cage plate 6, and the first water inlet pipe 27 and the first water outlet pipe 28 are controlled to circulate the cooling medium into the cooling water cavity 26 inside the screw shaft;

[0087] The higher the operating temperature in the press chamber, the greater the flow rate and faster the flow rate of the cooling medium circulation.

[0088] The water cooling process of the pressing cage 4 in this embodiment is as follows:

[0089] A low-temperature cooling medium is introduced into the semicircular tube cavity corresponding to the shunt pipe 12 through the second water inlet pipe 16, and the low-temperature cooling medium is shunted from the shunt pipe 12 into the first flow channel 14 of each cage plate 6, and flows into the cooling water tank 9 of each cage plate 6 from the outlet at the bottom of each first flow channel 14. The cooling medium exchanges heat with the sealing sleeve 10 in the cooling water tank 9, and quickly takes away the heat generated by the friction between the blank and the pressing bar 11 in the pressing chamber, thereby realizing rapid cooling of the pressing chamber; the cooling medium after heat exchange is respectively collected from each second flow channel 15 into the semicircular tube cavity corresponding to the water collecting pipe 13, and finally discharged through the second water outlet pipe 17. The discharged cooling medium is cooled and then introduced into the cooling water tank 9 through the second water inlet pipe 16, thereby realizing water-cooled circulation heat dissipation of the pressing chamber.

[0090] The water cooling process of the spiral shaft in this embodiment is as follows:

[0091] The screw 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 26 inside the rotating shaft body 30 through the first water inlet pipe 27. The cooling medium directly exchanges heat with the rotating shaft body 30, absorbs the heat of the rotating shaft body 30, and as the rotating shaft body 30 rotates, the cooling medium will cover the entire inner wall of the cooling water chamber 26, quickly reducing the temperature of the rotating shaft body 30. The cooling medium after heat exchange flows into the cover shell 33 through the shaft hole 32 of the rotating support shaft 31, and finally flows out from the first water outlet pipe 28 at the bottom of the cover shell 33, thereby realizing circulating water cooling of the screw shaft.

[0092] This embodiment uses rapeseed as the oil material to conduct three groups of tests on the operating conditions of the screw oil press. The change in the power consumption of the main motor can be directly reflected by the current of the main motor. The larger the current of the main motor, the greater the operating pressure and temperature in the pressing chamber, and the greater the power consumption of the motor. Therefore, this embodiment indirectly reflects the improvement effect of the operating temperature inside the pressing chamber by designing the water cooling structure of the cage plate and the screw shaft of the screw oil press in this embodiment by collecting the main motor current data and the corresponding operating temperature data inside the pressing chamber during the operation of the screw oil press. The test results are shown in Table 1 below:

[0093] Table 1 Test results of screw oil press operating conditions

[0094] Serial number Main motor current (A) Press chamber operating temperature (℃) 1 14 52～58 2 17 62～65 3 15 55～60

[0095] According to Table 1 above, the improved screw oil press of this embodiment greatly reduces the operating temperature inside the pressing chamber, and the maximum operating temperature inside the pressing chamber does not exceed 65°C, ensuring that the pressing temperature of the pressing chamber is always maintained within the cold pressing process range below 65°C, thereby greatly improving the quality of the cold-pressed oil.

[0096] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw cold press machine that operates at low temperature throughout the entire pressing process in a pressing box, comprising a frame (1), a controller (2), a driving component (3) and a pressing cage (4) mounted on the frame (1), a feeding hopper (5) mounted at the feed end of the pressing cage (4), and a single screw shaft or multiple screw shafts mounted in the pressing cage (4); characterized in that: The pressing cage (4) comprises a plurality of cage plates (6) arranged at intervals along the axial direction, and the opposite side edges of the plurality of cage plates (6) are fixedly connected by a first connecting plate (7) and a second connecting plate (8) respectively; a heat exchange channel is provided on the inner wall of the inner hole of the cage plate (6) along the circumferential direction, and a plurality of pressing bars (11) are arranged adjacent to the side wall of the heat exchange channel along the circumferential direction, and the plurality of pressing bars (11) are surrounded to form a pressing chamber; the heat exchange channel is connected to an external circulation pipeline through a corresponding flow channel; The spiral shaft comprises a truncated cone-shaped rotating shaft, a spiral pressing tooth (25) is arranged outside the rotating shaft, and the spiral pressing tooth (25) and the rotating shaft are integrally formed; a cooling water chamber (26) is arranged inside the rotating shaft, and the portion between the bottom surface of the spiral pressing tooth (25) and the cooling water chamber (26) is the truncated cone-shaped rotating shaft; the cooling water chamber (26) is connected to an external first water inlet pipe (27) and a first water outlet pipe (28).

2. A screw cold press with low temperature pressing in the pressing chamber as claimed in claim 1, characterized in that: The heat exchange channel comprises a cooling water tank (9), a heat exchange pipe is embedded in the cooling water tank (9), a plurality of pressing bars (11) are arranged closely along the circumference of the side wall of the heat exchange pipe, and the heat exchange pipe is connected to the external circulation pipeline through a corresponding flow channel.

3. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 1, characterized in that: The heat exchange channel comprises a cooling water trough (9), a sealing sleeve (10) is welded on the opening side of the cooling water trough (9), a plurality of pressing bars (11) are arranged closely along the circumference of the side wall of the sealing sleeve (10), and the cooling water trough (9) is connected to an external circulation pipeline through a corresponding flow channel.

4. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 1, characterized in that: The external circulation pipeline comprises a shunt pipe (12) and a water collecting pipe (13), and the shunt pipe (12) and the water collecting pipe (13) are respectively installed on the first connecting plate (7) and the second connecting plate (8); the shunt pipe (12) is respectively connected to the heat exchange channel of each cage plate (6) through the corresponding first flow channel (14), and the water collecting pipe (13) is respectively connected to the heat exchange channel of each cage plate (6) through the corresponding second flow channel (15); the shunt pipe (12) and the water collecting pipe (13) are respectively connected to the second water inlet pipe (16) and the second water outlet pipe (17).

5. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 4, characterized in that: The cage plate (6) is composed of two semi-annular plates (18), and the two semi-annular plates (18) are detachably connected by a connecting piece; a pressure plate (19) is fixedly installed at both ends of the inner hole of each semi-annular plate (18), and a plurality of pressing bars (11) are arranged closely between the two pressure plates (19); the heat exchange channel and the sealing sleeve (10) are both two-section split structures, and the openings at both ends of the heat exchange channel are provided with sealing plugs (20); the first connecting plate (7), the second connecting plate (8), the diverter pipe (12), the water collecting pipe (13), the first flow channel (14), and the second flow channel (15) are each provided with two groups, which are respectively used for circulating water in the heat exchange channels inside the two semi-annular plates (18).

6. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 5, characterized in that: The connecting member comprises a bolt (21), a pin (22) and an ear plate (23); the sides of the two first connecting plates (7) and the second connecting plates (8) are provided with through holes for installing the bolts (21); the through holes are provided between two adjacent cage plates (6); the two first connecting plates (7) and the two second connecting plates (8) are connected by bolts (21) respectively; the bottom ends of the two second connecting plates (8) are provided with ear plates (23); the pin (22) passes through the shaft holes (32) of the four ear plates (23) in sequence.

7. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 1, characterized in that: The rotating shaft comprises a power input shaft (29), a rotating shaft body (30) and a rotating support shaft (31) which are connected in sequence along the axial direction; the cooling water chamber (26) is arranged inside the rotating shaft body (30); the spiral pressing teeth (25) and the rotating shaft body (30) are integrally formed; the rotating support shaft (31) is a hollow shaft, and the shaft hole (32) of the rotating support shaft (31) is connected to the cooling water chamber (26); the first water inlet pipe (27) and the first water outlet pipe (28) are installed at the ends of the rotating support shaft (31).

8. A screw cold press machine with low temperature pressing in the pressing chamber as claimed in claim 7, characterized in that: A bearing assembly is installed on the outside of the rotating support shaft (31), and a cover shell (33) is sealed on the outer end surface of the bearing assembly; one end of the first water inlet pipe (27) is located outside the cover shell (33), and the other end is located inside the cover shell (33) and extends to the inside of the cooling water chamber (26); the first water outlet pipe (28) is installed on the outside of the bottom of the cover shell (33); a mounting hole is provided on the side of the cover shell (33), and a threaded joint (40) is sealed in the mounting hole, and the first water inlet pipe (27) is fixedly installed on the cover shell (33) through the threaded joint (40).

9. A screw cold press with low temperature pressing in the pressing chamber as claimed in claim 8, characterized in that: The bearing assembly comprises a bearing sleeve (34) fixedly sleeved on the outside of a rotating support shaft (31); a roller bearing (35) is sleeved on the outside of the bearing sleeve (34); a bearing seat (36) is sleeved on the outside of the roller bearing (35); a bearing cover (37) is provided at the front and rear ends of the bearing seat (36); an open end of the cover shell (33) is sealed and welded to the bearing cover (37) at the front end of the bearing seat (36); and an oil seal element (38) is provided between the inner side of the bearing cover (37) and the bearing sleeve (34).

10. A method for cooling a pressing chamber, based on the screw cold press according to any one of claims 1 to 9, characterized in that: The following steps are involved: Real-time monitoring of operating temperature data in the pressing chamber; According to the monitored temperature data, the external circulation pipeline is controlled to circulate the cooling medium into the heat exchange channel of the cage plate (6), and the first water inlet pipe (27) and the first water outlet pipe (28) are controlled to circulate the cooling medium into the cooling water cavity (26) inside the spiral shaft; The higher the operating temperature in the press chamber, the greater the flow rate and faster the flow rate of the cooling medium circulation.

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