Low-temperature, high-pressure puffing device for cowhide processing

Abstract

This invention discloses a low-temperature, high-pressure puffing device for processing cowhide, belonging to the technical field of food processing equipment. The device utilizes a porous medium layer on the inner wall of a tank and a honeycomb-shaped array of protrusions on its surface. A first hole is located at the top of each protrusion, and a second hole is located at the base. Combined with an alternating circulation system of refrigerant and heating medium channels spirally wound around the outer wall of the tank, and the injection of inert gas through pressurized channels at the openings to create a uniform airflow field, along with a multi-layered material tray driven by a vertically rotating shaft and radial guide channels, the cowhide achieves three-dimensional uniform puffing in a low-temperature, high-pressure environment. This invention is used for the efficient preparation of puffed cowhide food products, significantly improving the product's puffing rate, crispness, and color quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of food processing equipment, and in particular relates to a low-temperature high-pressure puffing device for processing cowhide. Background Technology

[0002] In the food processing industry, the puffing technology of cowhide has gradually gained attention as a processing method to increase the added value of by-products. Currently, traditional puffing processes mostly use high-temperature frying or hot air drying combined with instantaneous pressure relief to achieve material puffing, but these methods have significant limitations in practical applications. The problem of low puffing efficiency is particularly prominent. Due to the dense texture and high collagen content of cowhide, traditional high-temperature treatment easily leads to premature surface hardening, hindering the rapid vaporization of internal moisture and limiting the degree of puffing. Studies have shown that the puffing rate of cowhide under conventional processes is typically only around 200%, a significant difference compared to plant-based puffed foods, making it difficult to achieve the ideal crispy texture. Secondly, insufficient product uniformity is another key defect. The airflow distribution system design of existing equipment is relatively simple, such as using single-sided gas injection or static material placement, resulting in uneven distribution of temperature and pressure fields within the tank. This can easily lead to localized over-puffing or under-puffing within the same batch of products. Furthermore, energy consumption also restricts the large-scale application of the process. Traditional puffing processes require prolonged high temperatures or frequent switching between heating and cooling systems, lacking an effective thermal energy circulation mechanism, resulting in low energy utilization. Taking frying as an example, continuous high temperatures not only increase energy consumption but also accelerate oil oxidation, affecting product quality stability. The inability to simultaneously meet the requirements of high puffing rate, low energy consumption, and product uniformity has become a core obstacle restricting the industrial production of puffed beef skin snacks. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0004] Another objective of this invention is to provide a low-temperature, high-pressure puffing device for cowhide processing, which solves the problems of uneven airflow distribution, low temperature control accuracy, and insufficient heating of materials in existing cowhide puffing equipment, resulting in low puffing efficiency and product quality fluctuations.

[0005] Therefore, the technical solution provided by this utility model is as follows: A low-temperature, high-pressure puffing device for cowhide processing includes: The tank has an opening at the top. The inner wall surface of the tank is provided with a porous medium layer. The surface of the porous medium layer is provided with multiple protrusions to form a protrusion array. The protrusion array is arranged in a honeycomb pattern. Each protrusion has multiple first holes at its top area and multiple second holes in the area between the roots of the protrusions. The diameter of the second holes is larger than the space of the first holes. A circulation system includes a refrigerant channel and a heating medium channel, wherein the refrigerant channel and the heating medium channel are alternately distributed on the outer wall of the tank in a spiral winding manner; A pressurization channel is provided at the opening of the tank and located inside the tank. The pressurization channel is arranged around the opening of the tank and one end of it is connected to an inert gas source. The lower surface of the pressurization channel is provided with multiple injection holes. A cowhide holding device includes a vertically arranged column and a material tray arranged on the column, the column being rotatably mounted on the bottom wall of the tank; A lid is provided on the tank body to close the opening of the tank body. Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the protrusions in the protrusion array are frustum-shaped protrusions, the center-to-center distance between adjacent frustum-shaped protrusions in the frustum-shaped protrusion array is 1.5 to 2 times the bottom diameter of the protrusion, the height of the frustum-shaped protrusion is 0.5 to 0.75 times the bottom diameter, and the distribution density of the frustum-shaped protrusion array is 4 to 6 per square centimeter. Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the refrigerant channel is filled with liquid carbon dioxide, the heating medium channel is filled with saturated steam at a pressure of 0.2~0.5 MPa, the inlet temperature of the refrigerant channel of the circulation system is set to -30℃~-10℃, the inlet temperature of the heating medium channel is set to 80℃~120℃, and the medium flow velocity between the refrigerant channel and the heating medium channel is 0.5m / s~1.5m / s. Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the diameter of the injection hole is 2-3 mm, the axis of the injection hole forms an angle of 45°-60° with the central axis of the tank, and the spacing of the injection holes is 8-10 times the diameter of the hole.

[0006] Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the cover is provided with a pressure relief valve port, the valve core of the pressure relief valve port is opened or closed by an electromagnetic drive device, and the diameter of the pressure relief valve port is 100~150mm.

[0007] Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the surface of the rotating material tray is provided with radial guide grooves, the depth of the radial guide grooves is 3~5mm, and the width of the radial guide grooves is 2~3 times the depth of the grooves.

[0008] Preferably, the low-temperature high-pressure puffing device for cowhide processing further includes: The bearing assembly has its outer ring fixed to the bottom wall of the tank, while its inner ring is interference-fitted with the bottom end of the column. A servo motor, the output shaft of which is coaxially connected to the column, is fixed to the outside of the bottom of the tank.

[0009] Preferably, in the low-temperature high-pressure puffing device for cowhide processing, the pore size of the first hole is 50~80μm, and the pore size of the second hole is 150~200μm.

[0010] The embodiments of this utility model include at least the following beneficial effects: This invention utilizes a honeycomb design with a porous media layer and a raised array within the tank, combined with alternating spirally wound cooling and heating channels, to achieve uniform airflow distribution and precise temperature field control, effectively improving puffing efficiency and product uniformity. The synergistic effect of the rotatable material tray and the inclined injection holes enhances the penetration of high-pressure gas into the material, reducing localized unexpanded areas. This invention optimizes the geometric parameters and distribution density of the frustum-shaped protrusions, balances airflow permeability and structural strength, and avoids excessive concentration or uneven distribution of airflow at the root of the protrusions, thus significantly improving the uniformity of puffing. This invention achieves rapid temperature switching and gradient control through the alternating circulation of liquid carbon dioxide and pressurized saturated steam, reducing energy consumption while expanding the puffing process window to adapt to the puffing requirements of different materials. This invention optimizes the coverage and impact force distribution of high-pressure gas by limiting the diameter, angle, and spacing of the injection holes, thus avoiding material damage or localized puffing defects caused by excessive airflow impact or insufficient coverage. This invention utilizes an electromagnetically driven, large-diameter pressure relief valve design to achieve rapid response and uniform pressure relief, reducing the expansion and shrinkage problems caused by pressure relief delays and ensuring product shape stability. This invention improves the flow performance of the material tray through a radial flow channel structure, promotes the dynamic dispersion of accumulated materials, avoids uneven local heating, and enhances the overall puffing effect. This invention enhances the stability and controllability of column rotation through the cooperation of bearing assembly and servo motor, reduces the impact of vibration on material distribution, and ensures the uniformity of the dynamic puffing process. This invention optimizes the airflow resistance distribution of the porous medium layer through a layered pore design, reduces the risk of local blockage, extends the service life of the equipment, and improves process stability.

[0011] Other advantages, objectives, and features of the embodiments of this utility model will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the embodiments of this utility model. Attached Figure Description

[0012] Figure 1This is a cross-sectional structural schematic diagram of a low-temperature high-pressure puffing device for cowhide processing according to one embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the protrusion structure in one embodiment of the present invention.

[0014] Figure 3 This is a cross-sectional schematic diagram of the porous media layer in one embodiment of the present invention. Detailed Implementation

[0015] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement them based on the description.

[0016] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a low-temperature, high-pressure puffing device for cowhide processing, comprising: The tank 1 has an opening at the top. A porous media layer 6 is formed on the inner wall surface of the tank 1. Multiple protrusions 601 are arranged in a honeycomb pattern on the surface of the porous media layer 6. Each protrusion 601 has multiple first holes at its top region and multiple second holes at the base of each protrusion 601. The diameter of the second holes is larger than the space of the first holes. Optionally, the porous media layer 6 on the inner wall of the tank 1 is made of austenitic stainless steel plate. (The first and second holes are not shown in the figure.)

[0017] The circulation system includes a refrigerant channel and a heating medium channel, which are alternately distributed on the outer wall of the tank 1 in a spiral winding manner; optionally, the refrigerant channel and the heating medium channel are made of stainless steel pipes and are arranged alternately in a spiral winding manner.

[0018] The pressurization channel 2 is located at the opening of the tank 1 and inside the tank 1. The pressurization channel 2 is arranged around the opening of the tank 1 and one end of it is connected to an inert gas source. The lower surface of the pressurization channel 2 is provided with multiple injection holes. The pressurization channel 2 is made of stainless steel annular tube and is distributed around the opening of the tank 1. The injection holes are processed by laser drilling.

[0019] A cowhide holding device includes a vertical column 5 and a material tray 4 disposed on the column 5. The column 5 is rotatably disposed on the bottom wall of the tank body 1. Optionally, the material tray 4 is made of aluminum alloy by stamping.

[0020] A cover 3 is disposed on the tank body 1 to close the opening of the tank body 1.

[0021] In the above scheme, preferably, the protrusions 601 in the protrusion array are frustum-shaped protrusions 601. The center-to-center distance between adjacent frustum-shaped protrusions 601 in the frustum-shaped protrusion array is 1.5 to 2 times the base diameter of the protrusion 601, the height of the frustum-shaped protrusion 601 is 0.5 to 0.75 times the base diameter, and the distribution density of the frustum-shaped protrusion array is 4 to 6 per square centimeter. Optionally, the base diameter of the frustum-shaped protrusions 601 can be set to three specifications: 4mm, 5mm, and 6mm, corresponding to heights of 2mm, 2.5mm, and 3.5mm. The center-to-center distance between adjacent protrusions 601 is set to 1.8 times the base diameter, and the distribution density is selected as the middle value of 5 per square centimeter. The taper angle can be processed into three specifications: 70°, 80°, and 90°, and the radius of the root rounded corner is uniformly processed to 0.8mm.

[0022] In one embodiment of this invention, preferably, the refrigerant channel is filled with liquid carbon dioxide, and the heating medium channel is purged with saturated steam at a pressure of 0.2~0.5 MPa. The inlet temperature of the refrigerant channel in the circulation system is set to -30℃~-10℃, the inlet temperature of the heating medium channel is set to 80℃~120℃, and the flow velocity of the medium between the refrigerant channel and the heating medium channel is 0.5~1.5 m / s. Optionally, the liquid carbon dioxide charging pressure of the refrigerant channel is set to 2.5-3.0 MPa, and the inlet temperature is an intermediate value of -20℃.

[0023] In one embodiment of this utility model, preferably, the diameter of the injection hole is 2-3 mm, the axis of the injection hole forms an angle of 45°-60° with the central axis of the tank body 1, and the spacing between the injection holes is 8-10 times the hole diameter.

[0024] In one embodiment of this utility model, preferably, the cover 3 is provided with a pressure relief valve port. The valve core of the pressure relief valve port is opened or closed by an electromagnetic drive device, and the diameter of the pressure relief valve port is 100~150mm. Optionally, the valve core drive device can be an electromagnet. The valve body is made of stainless steel casting.

[0025] In one embodiment of this utility model, preferably, the surface of the rotary material tray 4 is provided with radial guide grooves, the depth of which is 3-5 mm and the width of which is 2-3 times the depth. Optionally, the depth of the radial guide grooves is selected as 4 mm, and the width is set to 10 mm, which is 2.5 times the depth.

[0026] In one embodiment of this utility model, as a preferred bearing assembly, its outer ring is fixed to the bottom wall of the tank 1, while the inner ring is interference-fitted with the bottom end of the column 5. A servo motor, the output shaft of which is coaxially connected to the column 5, is fixed to the outside of the bottom of the tank body 1.

[0027] Optionally, the outer ring of the bearing assembly is fixed to the bottom wall of the tank 1 via a flange mounting method. The inner ring and the bottom end of the column 5 are interference-fitted, and are heat-fitted after oil bath heating during assembly.

[0028] In one embodiment of this utility model, preferably, the pore size of the first hole is 50-80 μm, and the pore size of the second hole is 150-200 μm. The diameter of the first hole in the top region of the protrusion 601 can be selected from three specifications: 50 μm, 60 μm, and 70 μm, while the diameter of the second hole in the root region can be selected from three specifications: 150 μm, 180 μm, and 200 μm. Optionally, the pore size of the first hole is processed using selective laser melting technology. The pore size of the second hole is processed using an electrochemical machining process.

[0029] In one embodiment of this invention, preferably, each injection orifice is independently equipped with a normally closed two-position, two-way solenoid valve, the valve body being made of stainless steel; 4-8 piezoresistive pressure sensors are arranged inside the tank 1. 4-8 temperature sensors are also installed inside the tank 1. A controller is arranged outside the tank 1, and the controller is communicatively connected to the temperature sensors, the piezoresistive pressure sensors, the electromagnetic drive device of the valve core of the pressure relief valve, and the two-position, two-way solenoid valve of the injection orifice. The temperature sensors monitor the temperature distribution near the porous medium layer 6 inside the tank 1 in real time, and the pressure sensors detect the dynamic pressure value during the gas expansion stage. The controller automatically switches the operating state of the refrigerant channel and the heating medium channel according to a preset process curve. Pre-cooling stage: The controller starts the refrigerant channel, and liquid carbon dioxide flows spirally through the outer wall of tank 1 at a flow rate of 0.5~1.5m / s; Heating and expansion stage: The controller switches to the heating medium channel, and 0.2~0.5 MPa saturated steam heats tank 1 through the spiral jacket. The temperature sensor provides real-time feedback data and dynamically adjusts the steam flow rate to ensure that the temperature inside the tank is accurately and stably maintained within the range of 80℃~120℃.

[0030] Inert gas is injected into tank 1 through the inclined injection port of pressurization channel 2. The injection angle of 45°~60° causes the airflow to collide with the frustum-shaped convex array, forming a vortex flow. The pressure sensor continuously monitors the airflow pressure, and the controller automatically adjusts the gas source flow rate according to pressure fluctuations. When the pressure value is lower than the process threshold, increase the gas supply. When local pressure exceeds the limit, self-balancing is achieved by reducing the airflow rate in the adjacent injection hole region.

[0031] When the material tray 4 rotates at a constant speed: the radial guide channel throws the condensate to the edge of the tray through centrifugal force to avoid liquid retention; the controller adjusts the rotation speed synchronously when switching between hot and cold media based on temperature sensor data (such as reducing the speed to reduce cold loss in the low temperature stage and increasing the speed to enhance heat conduction in the high temperature stage).

[0032] When expansion is complete, the controller synchronously executes the following actions: closing the refrigerant / heating medium channel and stopping temperature regulation; based on real-time data from the pressure sensor, triggering the electromagnetic drive device to instantaneously open the 100~150mm pressure relief valve port, causing the pressure inside the tank to decrease linearly, preventing sudden pressure differentials from causing the fiber structure to shrink; when the pressure sensor detects a normal pressure state, it automatically closes the valve port and indicates completion.

[0033] The fully automated process is as follows: 1. After loading, the controller starts a seal check, and after confirming that the cover 3 is closed, it activates the pre-cooling program; 2. Once the temperature and pressure parameters meet the standards, inert gas is automatically injected and the tray rotation is initiated; 3. The hot and cold media alternate according to the process sequence, and the controller dynamically adjusts the media flow rate and gas flow rate; 4. Once the puffing time reaches the set value, the staged pressure relief procedure is triggered; 5. After depressurization is complete, unlock cover 3 to end the processing cycle. This design achieves four-dimensional coordinated control of temperature field, pressure field, flow field and mechanical motion field through closed-loop linkage between sensor network and actuator, ensuring process accuracy while avoiding random errors introduced by traditional manual operation.

[0034] To enable those skilled in the art to better understand the technical solution of this utility model, the following embodiments are provided for further explanation: A low-temperature, high-pressure puffing device for cowhide processing includes: The tank 1 has an opening at the top. A porous medium layer 6 is provided on the inner wall surface of the tank 1. Multiple protrusions 601 are arranged in a protrusion array on the surface of the porous medium layer 6. The protrusion array is arranged in a honeycomb pattern. Each protrusion 601 has multiple first holes at its top region and multiple second holes at the base regions of each protrusion 601. The diameter of the second holes is larger than that of the first holes. The protrusions 601 in the protrusion array are frustum-shaped protrusions 601. The center-to-center distance between adjacent frustum-shaped protrusions 601 in the frustum-shaped protrusion array is 1.5 to 2 times the base diameter of the protrusion 601. The height of each frustum-shaped protrusion 601 is 0.5 to 0.75 times its base diameter. The distribution density of the frustum-shaped protrusion array is 4 to 6 protrusions per square centimeter. The pore size of the first holes is 50 to 80 μm, and the pore size of the second holes is 150 to 200 μm. A circulation system includes a refrigerant channel and a heating medium channel, which are alternately distributed on the outer wall of the tank 1 in a spiral winding manner. The refrigerant channel is filled with liquid carbon dioxide, and the heating medium channel is filled with saturated steam at a pressure of 0.2~0.5 MPa. The inlet temperature of the refrigerant channel is set to -30℃~-10℃, and the inlet temperature of the heating medium channel is set to 80℃~120℃. The flow velocity of the medium in the refrigerant channel and the heating medium channel is 0.5m / s~1.5m / s. A pressurization channel 2 is disposed at the opening of the tank 1 and located inside the tank 1. The pressurization channel 2 is arranged around the periphery of the opening of the tank 1, and one end of it is connected to an inert gas source. The lower surface of the pressurization channel 2 is provided with a plurality of injection holes. The diameter of the injection holes is 2-3 mm, the axis of the injection holes forms an angle of 45°-60° with the central axis of the tank 1, and the spacing between the injection holes is 8-10 times the diameter of the holes. A cowhide holding device includes a vertically arranged column 5 and a material tray 4 arranged on the column 5. The column 5 is rotatably arranged on the bottom wall of the tank body 1. The surface of the material tray 4 is provided with radial guide grooves, the depth of the radial guide grooves is 3~5mm, and the width of the radial guide grooves is 2~3 times the depth of the grooves. The bearing assembly has its outer ring fixed to the bottom wall of the tank 1, while its inner ring is interference-fitted with the bottom end of the column 5. A servo motor, the output shaft of which is coaxially connected to the column 5.

[0035] A cover 3 is provided on the tank body 1 and closes the opening of the tank body 1. A pressure relief valve port is provided on the cover 3. The valve core of the pressure relief valve port is opened or closed by an electromagnetic drive device. The diameter of the pressure relief valve port is 100~150mm.

[0036] After placing the hide into the material tray 4, close the cover 3. Start the refrigerant channel to pre-cool the tank 1 to -30℃ to -10℃, then switch to the heating medium channel to raise the temperature to 80℃ to 120℃. At the same time, turn on the inert gas source to inject gas to the set pressure, start the servo motor to drive the tray to rotate, and the hot and cold media alternate according to the process requirements. After the puffing stage is completed, the solenoid valve quickly releases the pressure, and the hide is taken out to complete the processing.

[0037] In this invention, a circulation system alternates between the refrigerant channel and the heating medium channel. Liquid carbon dioxide and saturated vapor flow within the spiral winding channel, rapidly cooling or heating the tank 1 respectively. The alternating switching of hot and cold media achieves uniform heat conduction through the spiral structure of the outer wall. The first and second pores of the porous medium layer 6 on the inner wall of the tank 1 work together to regulate the coupling effect of airflow and heat flow, forming a gradient temperature field. Inert gas is injected into tank 1 at an inclined angle through the injection holes of pressurized channel 2. The airflow interacts with the frustum-shaped protrusion array to form a spiral flow field that uniformly covers the material surface. The injection angle and pore size classification design avoids direct airflow that could cause localized high pressure, while also extending the gas residence time. The cowhide is placed on the material tray 4. The material tray 4 is rotated at a constant speed by the drive column 5. The radial guide channel guides the condensate to be discharged radially, so that each side of the cowhide is alternately exposed to the airflow and temperature field, realizing three-dimensional expansion. After expansion is complete, the electromagnetic drive instantly opens the pressure relief valve, allowing the high-pressure gas to be rapidly discharged through the large-diameter valve port, preventing the microporous structure from collapsing during pressure drop. The circulation of the hot and cold media simultaneously stops, and the system returns to normal pressure. This invention achieves uniform airflow distribution and precise temperature field control through the synergistic design of a porous media layer and a honeycomb-shaped protrusion array within the tank, combined with spirally wound refrigerant and heating medium channels, significantly improving expansion efficiency and product uniformity. By optimizing the geometric parameters and distribution density of the frustum-shaped protrusions, airflow permeability and structural strength are balanced, avoiding localized pressure concentration and further ensuring expansion uniformity. The alternating circulation design of liquid carbon dioxide and pressurized saturated vapor significantly improves temperature switching efficiency, reduces energy consumption, and broadens the process's applicability. The configuration of limited injection orifice diameter, angle, and spacing optimizes the coverage and impact force distribution of high-pressure gas, reducing material breakage or expansion defects. The electromagnetically driven large-diameter pressure relief valve provides rapid response and uniform pressure relief, effectively suppressing product shrinkage and ensuring morphological stability. The introduction of radial guide channels promotes dynamic material dispersion, and combined with a servo motor-driven rotating tray, enhances heating uniformity and avoids quality fluctuations caused by localized accumulation. The layered porous media layer reduces airflow resistance differences and the risk of blockage, extending equipment lifespan. Based on the above-mentioned technological improvements, the device achieves a synergistic effect in airflow control, temperature switching, dynamic flow guidance, and structural stability, ultimately realizing efficient, low-consumption, and homogeneous production of kraft paper puffed food.

[0038] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the embodiments of the present invention. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the embodiments of the present invention are not limited to the specific details and illustrations shown and described herein.

Claims

1. A low temperature high pressure bulking device for processing cowhides, characterized by, include: The tank has an opening at the top. The inner wall surface of the tank is provided with a porous medium layer. The surface of the porous medium layer is provided with multiple protrusions to form a protrusion array. The protrusion array is arranged in a honeycomb pattern. Each protrusion has multiple first holes at its top area and multiple second holes in the area between the roots of the protrusions. The diameter of the second holes is larger than the space of the first holes. A circulation system includes a refrigerant channel and a heating medium channel, which are alternately distributed on the outer wall of the tank in a spiral winding manner. The refrigerant channel is filled with liquid carbon dioxide, and the heating medium channel is filled with pressurized saturated steam. The inlet temperature of the refrigerant channel of the circulation system is set to -30℃ to -10℃, and the inlet temperature of the heating medium channel is set to 80℃ to 120℃. A pressurization channel is provided at the opening of the tank and located inside the tank. The pressurization channel is arranged around the opening of the tank and one end of it is connected to an inert gas source. The lower surface of the pressurization channel is provided with multiple injection holes. A cowhide holding device includes a vertically arranged column and a material tray arranged on the column, the column being rotatably mounted on the bottom wall of the tank; A lid is provided on the tank body to close the opening of the tank body.

2. The low-temperature high-pressure bulking device for processing cowhide according to claim 1, characterized by, The protrusions in the protrusion array are frustum-shaped protrusions. The center-to-center distance between adjacent frustum-shaped protrusions in the frustum-shaped protrusion array is 1.5 to 2 times the bottom diameter of the protrusion. The height of the frustum-shaped protrusion is 0.5 to 0.75 times the bottom diameter. The distribution density of the frustum-shaped protrusion array is 4 to 6 per square centimeter.

3. The low-temperature high-pressure bulking device for processing cowhide according to claim 1, wherein The diameter of the injection hole is 2~3mm, the axis of the injection hole forms an angle of 45°~60° with the central axis of the tank, and the spacing of the injection holes is 8~10 times the diameter of the hole.

4. The low-temperature high-pressure bulking device for processing cowhide according to claim 1, wherein The cover is provided with a pressure relief valve port, and the valve core of the pressure relief valve port is opened or closed by an electromagnetic drive device. The diameter of the pressure relief valve port is 100~150mm.

5. The low-temperature high-pressure bulking device for processing cowhide according to claim 1, wherein The surface of the rotating material tray is provided with radial guide grooves, the depth of which is 3-5 mm and the width of which is 2-3 times the depth.

6. The low-temperature high-pressure bulking device for processing cowhide according to claim 1, wherein Also includes: The bearing assembly has its outer ring fixed to the bottom wall of the tank, while its inner ring is interference-fitted with the bottom end of the column. A servo motor, the output shaft of which is coaxially connected to the column, is fixed to the outside of the bottom of the tank.

7. The low-temperature high-pressure puffing device for cowhide processing as described in claim 1, characterized in that, The pore size of the first pore is 50~80μm, and the pore size of the second pore is 150~200μm.

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