Double shoe press device

Abstract

The utility model discloses a double -shoe formula squeezing device relates to the technical field of shoe formula squeezing device, and double -shoe formula squeezing device includes primary roll formula squeezing mechanism and secondary double -shoe squeezing mechanism, and primary roll formula squeezing mechanism includes upper press roll and lower press roll, and secondary double -shoe squeezing mechanism includes upper shoe roll, lower shoe roll, roll, reversing roller and rotary drive arrangement, and rotary drive arrangement is used for driving the rotation of roll, and roll is located between upper shoe roll and lower shoe roll, and the side of upper shoe roll and lower shoe roll facing roll is equipped with shoe pressure subassembly all, and shoe pressure subassembly includes shoe pressure plate and shoe pressure hydraulic cylinder, and shoe pressure hydraulic cylinder is used for driving shoe pressure plate to be close to or away from roll, and the utility model discloses the combination of primary roll formula squeezing mechanism and secondary double -shoe squeezing mechanism realizes the squeezing, and the structure of secondary double -shoe squeezing mechanism is improved, can reduce the floor space, and make the even load -bearing stress of bearing, and the bearing requirement of selection is not so strict.

Description

Technical Field

[0001] This utility model relates to the technical field of boot-type pressing devices, and in particular to a double-boot-type pressing device. Background Technology

[0002] Currently, the pressing technologies used in papermaking dewatering equipment include "roll press" and "shoe press." "Roll press" involves instantaneous dynamic dewatering, but the paper's compression time is too short and it recovers quickly afterward, resulting in low pressing efficiency. Simply put, it involves two cylinders forming a line contact, i.e., a kinematic pair formed by the line contact between the two components. "Shoe press" is a newer wide-zone pressing technology that combines static pressure dewatering with roll press. Simply put, it involves an arc plate forming a surface contact between the arc plate and the cylinder, i.e., a kinematic pair formed by the surface contact between the two components. At present, "shoe press" technology is recognized as the most advanced pressing technology.

[0003] Modern papermaking equipment using shoe press technology can be divided into compound pressing and direct-flow pressing. Compound pressing combines shoe pressing with roll pressing to form a multi-roll compound pressing centered on the shoe press. Direct-flow pressing uses shoe pressing technology alone, and can be a closed direct-flow pressing system composed of one or more shoe presses. Currently used shoe press devices typically have one shoe press roller paired with one roll roller, while the shoe press device designed in this invention uses two shoe press rollers (upper shoe roller and lower shoe roller) paired with one roll roller.

[0004] With the increasing speed of papermaking equipment, existing shoe press units generally use one shoe press roll paired with one roller, which is one of the main reasons limiting the speed. As papermaking equipment speeds increase, on the one hand, to avoid tearing defects in the undried paper (due to the rapid increase in tension caused by the paper web's inertia), the pressure in the shoe press zone is reduced; on the other hand, the residence time of the undried paper in the press zone is shortened. Both factors reduce pressing efficiency and decrease the amount of water removed from the paper. Therefore, there are solutions using multiple shoe press units for dewatering, but the cost of multiple shoe press units is high, and the footprint also increases, which does not significantly improve economic efficiency. Furthermore, each shoe press unit requires a power source, increasing energy consumption to some extent. Alternatively, to increase the dwell time of the paper in the pressing zone, the diameter of the rollers may be increased, thereby widening the pressing zone and extending the time the paper stays in the pressing zone. However, the diameter and weight of the rollers cannot be increased indefinitely. On the one hand, the processing and footprint would be too large, and on the other hand, the mass would also increase with the increase in diameter. This places higher demands on the bearings at both ends of the rollers, and the power source that drives the rollers to roll also increases. Utility Model Content

[0005] This utility model aims to solve the technical problems existing in the prior art. To this end, this utility model proposes a double-shoe pressing device, which adopts a combination of a primary roller pressing mechanism and a secondary double-shoe pressing mechanism to achieve pressing. The structure of the secondary double-shoe pressing mechanism has been improved to reduce the space occupied and make the bearing load more uniform, and the requirements for the selected bearings are not so strict.

[0006] The double-boot type pressing device according to an embodiment of the present utility model includes:

[0007] A single-stage roller pressing mechanism, comprising an upper pressure roller and a lower pressure roller;

[0008] A two-stage double-shoe pressing mechanism includes an upper shoe roller, a lower shoe roller, a roller, a reversing roller, and a rotation drive device. The rotation drive device is used to drive the roller to rotate. The roller is located between the upper shoe roller and the lower shoe roller. Both the upper shoe roller and the lower shoe roller have shoe pressing assemblies on the side facing the roller. The shoe pressing assembly includes a shoe pressing plate and a shoe pressing hydraulic cylinder. The side of the shoe pressing plate facing the roller has an arc-shaped surface, which is adapted to the outer peripheral surface of the roller. The shoe pressing hydraulic cylinder is used to drive the shoe pressing plate to move closer to or away from the roller.

[0009] The paper passes sequentially between the upper pressure roller and the lower pressure roller, between the lower shoe roller and the roller, between the reversing roller, and between the upper shoe roller and the roller.

[0010] The double-boot type pressing device according to the embodiment of this utility model has at least the following beneficial effects:

[0011] 1. This utility model proposes the combined use of a primary roller press mechanism and a secondary double-shoe press mechanism. The paper first undergoes a primary roller press mechanism for a first roller press, and then undergoes a secondary double-shoe press mechanism for a second shoe press. This can greatly extend the residence time of the paper in the pressing area and effectively promote the removal of moisture from the paper.

[0012] 2. The upper and lower shoe rollers share a single roller, forming pressing zones between the upper and lower shoe rollers and between the lower and upper shoe rollers. This greatly utilizes materials and energy while reducing space requirements. The diameters of the upper and lower shoe rollers do not need to be increased. Furthermore, the symmetrical distribution of the upper and lower shoe rollers on the roller ensures uniform stress distribution, reduces bearing requirements, and extends bearing life. This is significantly different from traditional roller pressing and single-shoe pressing. This design incorporates two pressing zones within a single pressing mechanism, ensuring uniform bearing load distribution. Additionally, the smaller shoe roller design allows for less stringent bearing requirements.

[0013] In some embodiments, the secondary double-shoe pressing mechanism further includes a screw motor and an adjustment assembly for correspondingly controlling the up-and-down movement of the lower shoe roller or the upper shoe roller. The adjustment assembly includes a shoe roller moving slide and a vertical guide rail. The shoe roller moving slide is fixedly connected to the lower shoe roller or the upper shoe roller, and the shoe roller moving slide is slidably connected to the vertical guide rail. The screw shaft of the screw motor is threadedly connected to the lower shoe roller or the upper shoe roller to drive the lower shoe roller or the upper shoe roller to move up and down.

[0014] In some embodiments, the double-shoe press further includes a tension roller located between the primary roller press mechanism and the secondary double-shoe press mechanism, the tension roller being used to tension the paper.

[0015] In some embodiments, the double-shoe press further includes a blower located above or below the primary roller press mechanism, with the blower's outlet facing the primary roller press mechanism.

[0016] In some embodiments, the shoe pressure assembly further includes a return spring disposed within the cylinder body of the shoe pressure hydraulic cylinder, the return spring being used to assist the piston rod of the shoe pressure hydraulic cylinder in returning to its initial position.

[0017] In some embodiments, the upper shoe roller and the lower shoe roller have grooves on the side facing the roller, and the shoe pressure hydraulic cylinder is installed in the grooves.

[0018] In some embodiments, the double-boot press device further includes a lifting roller and a guide roller, the lifting roller being located below the guide roller, the lifting roller and the guide roller being used to clamp an upper blanket and a lower blanket, the upper blanket and the lower blanket being used to clamp the paper.

[0019] In some embodiments, the double-boot press device further includes an upper blanket tension adjusting roller and a lower blanket tension adjusting roller, wherein the upper blanket tension adjusting roller is used to tension the upper blanket and the lower blanket tension adjusting roller is used to tension the lower blanket.

[0020] In some embodiments, the double-shoe pressing device further includes a hydraulic system, which includes a main hydraulic pump unit, a standby hydraulic pump unit, and a single pressing zone hydraulic control unit. The main hydraulic pump unit is used to provide main hydraulic power to the primary roller pressing mechanism and the secondary double-shoe pressing mechanism. The standby hydraulic pump unit is used to replace the main hydraulic pump unit when the main hydraulic pump unit fails. The single pressing zone hydraulic control unit is used to independently control the pressure value of the shoe pressing hydraulic cylinder.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a double-boot type pressing device according to some embodiments of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the two-stage double-shoe pressing mechanism of the double-shoe pressing device according to some embodiments of the present invention;

[0025] Figure 3 This is a cross-sectional view of the secondary double-shoe pressing mechanism of the double-shoe pressing device according to some embodiments of the present invention;

[0026] Figure 4 This is a schematic diagram of the hydraulic system of the double-boot type pressing device according to some embodiments of the present invention;

[0027] Figure 5 This is a schematic diagram of the hydraulic control unit of a single pressing zone in the hydraulic system of a double-boot-type pressing device according to some embodiments of the present invention.

[0028] Figure label:

[0029] 1000 double-boot press unit;

[0030] The single-stage roller pressing mechanism 100, the upper pressing roller 101, and the lower pressing roller 102;

[0031] The components include: a two-stage double-shoe pressing mechanism 200, an upper shoe roller 201, a lower shoe roller 202, a groove 203, a roller 204, a reversing roller 205, a shoe pressing assembly 206, a shoe pressing plate 207, an arc-shaped surface 208, a shoe pressing hydraulic cylinder 209, a return spring 210, a lead screw motor 211, a shoe roller moving slide 212, a vertical guide rail 213, a shoe roller support beam 214, a shoe sleeve fixing plate 215, a hydraulic rod mounting plate 216, an oil circuit 217, a piston rod 218, a guide rod 219, a fixing plate 220, and a bolt pair 221.

[0032] Tensioning roller 300, blower 301, lifting roller 302, guide roller 303, upper blanket tension adjusting roller 304, lower blanket tension adjusting roller 305, fixed guide roller 306;

[0033] Paper 400;

[0034] Main hydraulic pump unit 500, standby hydraulic pump unit 501, single pressure zone hydraulic control unit 502, auxiliary hydraulic cylinder control unit 503, accumulator unit 504, hydraulic oil cooling unit 505, hydraulic oil detection unit 506, magnetic proportional directional valve 507, check valve 508, pressure transmitter 509. Detailed Implementation

[0035] Reference Figure 1 As shown, a double-shoe pressing device 1000 provided in this embodiment of the present utility model includes a primary roller pressing mechanism 100, a secondary double-shoe pressing mechanism 200, a tensioning roller 300, a blower 301, a lifting roller 302, a guide roller 303, an upper blanket tension adjusting roller 304, a lower blanket tension adjusting roller 305, and a fixed guide roller 306.

[0036] The primary roller pressing mechanism 100 includes a horizontally arranged upper pressing roller 101 and a lower pressing roller 102. Both the upper pressing roller 101 and the lower pressing roller 102 are controlled by hydraulic cylinders to move up and down, thereby pressing the paper. It should be noted that the primary roller pressing mechanism 100 performs roller pressing.

[0037] Reference Figures 1 to 3 As shown, the two-stage double-shoe pressing mechanism 200 includes an upper shoe roller 201, a lower shoe roller 202, a roller 204, a reversing roller 205, and a rotation drive device. The rotation drive device is used to drive the roller 204 to rotate, and the rotation drive device can be a motor. Both the upper shoe roller 201 and the lower shoe roller 202 are cylindrical rollers covered by shoe sleeves. The roller 204 is located between the upper shoe roller 201 and the lower shoe roller 202. The side of the upper shoe roller 201 and the lower shoe roller 202 facing the roller 204 is provided with a groove 203. The shoe pressing assembly 206 is installed in the groove 203, which can reduce the space occupied by the upper shoe roller 201 and the lower shoe roller 202. The shoe pressing assembly 206 includes a shoe pressing plate 207 and a shoe pressing hydraulic cylinder 209. The shoe pressing plate 207 has a C-shaped arc surface 208 on the side facing the roller 204. The arc surface 208 is adapted to the outer peripheral surface of the roller 204. The shoe pressing hydraulic cylinder 209 is used to drive the shoe pressing plate 207 to move closer to or away from the roller 204. Thus, pressing areas are formed between the upper shoe roller 201 and the roller 204, and between the lower shoe roller 202 and the roller 204, respectively. The pressing areas are relatively large. For the upper shoe roller 201 or the lower shoe roller 202, its internal structure includes a shoe roller support beam 214, a shoe sleeve fixing plate 215, a hydraulic rod mounting plate 216, and an oil passage 217. The shoe roller support beam 214 provides support, the shoe sleeve fixing plate 215 is used to fix the shoe sleeve on its outer periphery, the hydraulic rod mounting plate 216 is used to connect the hydraulic rod of the shoe pressure hydraulic cylinder 209 to the shoe pressure plate 207, and the oil passage 217 is used to supply oil to the shoe pressure hydraulic cylinder 209.

[0038] Among them, reference Figure 1As shown, the paper 400 is clamped by the upper and lower blankets (not shown in the attached diagram). Following the direction of the arrow, the paper 400 passes sequentially between the guide roller 303 and the lifting roller 302, between the upper pressure roller 101 and the lower pressure roller 102, between the lower shoe roller 202 and the roller 204, the reversing roller 205, and between the upper shoe roller 201 and the roller 204. The lifting roller 302 is located below the guide roller 303. The lifting roller 302 and the guide roller 303 are used to clamp the upper and lower blankets, which in turn clamp the paper 400.

[0039] It should be explained that the primary roller press mechanism 100 mainly serves as traction and pre-pressing, ensuring that the undried paper 400 has a certain degree of flexibility before entering the entire press unit. The secondary double-shoe press mechanism 200 mainly functions to ensure that the paper 400 undergoes a second shoe press after being reversed by the reversing roller 205 following the first shoe press. This double shoe press increases the time that a unit of paper 400 remains in the press zone. The guide roller 303 mainly guides the upper and lower blankets, thus changing the angle and direction of the paper 400. The upper blanket tension adjusting roller 304 and the lower blanket tension adjusting roller 305 mainly function to tension the upper and lower blankets to ensure they enter the entire press unit, preventing the blankets from folding. The blanket enters the pressing device; the lifting roller 302 moves up and down driven by a hydraulic cylinder and comes into contact with the guide roller 303, thereby increasing the friction and reducing the slippage of the blanket on the guide roller; the main function of the blanket tensioning roller is to tension the blanket so that it has a certain tension force to better improve the machine speed; the blower 301 is located above or below the primary roller pressing mechanism 100, and the air outlet of the blower 301 faces the primary roller pressing mechanism 100. The main function of the blower 301 is to cool the blanket and blow away a large amount of moisture from the blanket so that it can maintain low humidity when it re-enters the working area; the tensioning roller 300 is located between the primary roller pressing mechanism 100 and the secondary double-shoe pressing mechanism 200. The tensioning roller 300 is used to tension the paper 400.

[0040] In this design, undried paper 400 enters the equipment from the left side. First, the lifting roller 302 and guide roller 303 work together to clamp the undried paper 400 between the upper and lower felts, allowing it to enter the first-stage roller press. Subsequently, due to speed adjustments, the upper and lower felts are tensioned using the upper felt tension adjusting roller 304 and lower felt tension adjusting roller 305, causing the undried paper 400 to enter the double-shoe press device for the first time. Under the constraint of the guide roller 303, the angle at which the paper 400 enters the device can be adjusted to optimize the pressing effect. After the first shoe press, under the constraint of the guide roller 303 and the action of the reversing roller 205, the paper 400 begins its second entry into the second-stage double-shoe press mechanism 200 for a second shoe press. This process significantly extends the residence time of the paper 400 in the pressing area, effectively promoting the removal of moisture from the paper 400. Finally, under the joint constraint of the guide roller 303 and the fixed guide roller 306, and through the cooperation of the lifting roller 302 and the guide roller 303, the dried paper 400 held by the upper and lower blankets is successfully released, so that the paper 400 is ready to enter the subsequent drying process.

[0041] The double-boot type pressing device 1000 of this embodiment has the following beneficial effects:

[0042] 1. This utility model proposes the combined use of a primary roller press mechanism 100 and a secondary double-shoe press mechanism 200. The paper 400 first undergoes a primary roller press mechanism 100 for a first roller press, and then undergoes a secondary double-shoe press mechanism 200 for a second shoe press. This can greatly extend the residence time of the paper 400 in the pressing area and effectively promote the removal of moisture from the paper 400.

[0043] 2. The upper shoe roller 201 and the lower shoe roller 202 share a single roller 204. Pressing areas are formed between the upper shoe roller 201 and the roller 204, as well as between the lower shoe roller 202 and the roller 204. This greatly utilizes materials and energy and reduces the floor space. Furthermore, since the upper shoe roller 201 and the lower shoe roller 202 are symmetrically distributed on the roller 204, the force is uniform, the bearing requirements are reduced, and the bearing life is increased. This is significantly different from traditional roller pressing and single-shoe pressing. This solution designs two pressing areas on one pressing mechanism, which also makes the bearing load uniform. Moreover, due to the smaller size of the shoe roller, the requirements for the selected bearings are not as stringent.

[0044] 3. In this device, the upper shoe roller 201 and lower shoe roller 202 are driven components, and the roller 204 is the driving component. The roller 204 is directly driven by a servo motor, which can effectively control the start and stop of the roller 204. The tension of the paper 400 can be monitored by a sensor. This reduces the number of transmission devices, improves mechanical efficiency, and reduces power source loss.

[0045] Referring to the figures, in some embodiments, the secondary double-shoe pressing mechanism 200 further includes a screw motor 211 and an adjustment assembly for correspondingly controlling the up-and-down movement of the lower shoe roller 202 or the upper shoe roller 201. The adjustment assembly includes a shoe roller moving slide 212, a vertical guide rail 213, a guide rod 219, and a fixing plate 220. The shoe roller moving slide 212 is fixedly connected to the lower shoe roller 202 or the upper shoe roller 201, and is slidably connected to the vertical guide rail 213. The screw shaft of the screw motor 211 is threadedly connected to the lower shoe roller 202 or the upper shoe roller 201 to drive the lower shoe roller 202 or the upper shoe roller 201 to move up and down. The fixing plate 220 is fixedly connected to the frame. The guide rod 219 is fixedly connected to the shoe roller moving slide 212 by a bolt pair 221, and is slidably connected to the fixing plate 220 to provide guidance.

[0046] This design incorporates four lead screw motors 211, precisely configured to achieve efficient operation of the pressing device. Specifically, two of the lead screw motors 211 are mounted on the upper sides of the pressing device frame, their primary function being to control the vertical movement of the upper shoe roller 201. The other two lead screw motors 211 are positioned on the lower sides of the frame, responsible for driving the vertical movement of the lower shoe roller 202. By precisely controlling these lead screw motors 211, the up-and-down movement of the lead screw shaft can be achieved, thereby driving the shoe roller shaft, which is fixedly connected to it, to move synchronously. To ensure that the shoe roller maintains stable parallel movement, this embodiment also incorporates a structure of a shoe roller moving slide 212 and a vertical guide rail 213. Each shoe roller moving slide 212 is equipped with a slider that is slidably connected to the vertical guide rail 213. This design constitutes a highly efficient guide rail slider mechanism, which can strictly constrain the vertical movement of the shoe roller, ensuring that it remains parallel throughout the entire operation, thereby improving the stability and accuracy of the pressing device. In other embodiments, a sliding cooperation between the slider and the guide roller can also be used to achieve the guiding function.

[0047] The double-shoe pressing device 1000 of this embodiment has an ingenious mechanical structure design and two operating modes: working state and debugging state. In the debugging state, the adjustment process of the upper shoe roller 201 first loosens the two bolt pairs 221 between the guide rods 219 on both sides and the fixing plate 220 of the shoe roller moving slide 212 of the upper shoe roller 201, thereby loosening the guide rods 219 and the slider of the shoe roller moving slide 212. At this time, the shoe roller moving slide 212 is still slidably connected to the vertical guide rail 213. Subsequently, by precisely controlling the screw motors 211 on the left and right sides, the screws are driven to drive the shoe roller shaft. Since the shoe roller shaft is constrained by the structure of the shoe roller moving slide 212 and the vertical guide rail 213, the upper shoe roller 201 can slide upward parallel, realizing the separation from the roller 204. The adjustment process of the lower shoe roller 202 is similar to that of the upper shoe roller 201, except that when the lower shoe roller 202 separates from the roller 204, its movement direction is downward parallel movement. The movement range of the upper shoe roller 201 and lower shoe roller 202 is directly related to the movable range of the lead screw. By precisely controlling the rotation of the motor, the movement distance of the upper shoe roller 201 and lower shoe roller 202 can be accurately adjusted. In operation, to form the pressing zone, the lead screw motor 211 is controlled to move the lead screw downwards in parallel, causing the upper shoe roller 201 to contact the roller 204 and form the pressing zone. Once the predetermined position is reached, the shoe roller moving slide 212 and guide rod 219 are re-fixed by retightening the aforementioned bolt pair 221 to ensure the stability of the pressing zone. Similarly, to form the pressing zone between the lower shoe roller 202 and roller 204, the lead screw motor 211 is controlled to move the lead screw upwards in parallel. After reaching the designated position, the shoe roller moving slide 212 and guide rod 219 are re-fixed by retightening the aforementioned bolt pair 221 to maintain the accuracy and efficiency of the pressing zone. This design not only improves the operational flexibility of the pressing device but also ensures the accuracy and reliability of the pressing process. Through precise motor control and structural design, this embodiment achieves efficient adjustment and stable operation of the pressing device.

[0048] In some embodiments, the shoe pressing assembly 206 further includes a return spring 210, which is disposed within the cylinder body of the shoe pressing hydraulic cylinder 209. The return spring 210 assists the piston rod 218 of the shoe pressing hydraulic cylinder 209 in returning to its initial position. During operation, an external oil supply device continuously injects hydraulic oil into the oil chamber of the shoe pressing hydraulic cylinder 209 through the oil inlet, applying pressure to the piston rod 218 of the shoe pressing hydraulic cylinder 209, causing it to move downwards. This action, in turn, causes the shoe pressing plate 207 to apply downward pressure, achieving a tight connection between the shoe roller and the roller 204, forming an effective pressing area. During this process, the downward movement of the piston rod 218 causes the return spring 210 to remain in a compressed state. When the equipment is not in operation, the oil inlet stops supplying oil, and the piston rod 218 and the shoe pressing plate 207 are depressurized. Because the shoe pressing plate 207 itself is heavy, external force is required to return it to its initial state. At this point, the return spring 210 exerts its restoring force, pushing the hydraulic piston rod 218 upward, which in turn moves the hydraulic piston rod 218 and the shoe pressure plate 207 upward together, causing the shoe pressure plate 207 to disengage from the pressing area and smoothly return to its initial position. This not only ensures the high efficiency of the pressing process but also, with the assistance of the return spring 210, enables the equipment to quickly reset, improving operational convenience and extending the equipment's service life.

[0049] Reference Figure 4 As shown, in some embodiments, the double-shoe pressing device 1000 further includes a hydraulic system, which includes a main hydraulic pump unit 500, a standby hydraulic pump unit 501, and a single pressing zone hydraulic control unit 502. The main hydraulic pump unit 500 is used to provide main hydraulic power to the primary roller pressing mechanism 100 and the secondary double-shoe pressing mechanism 200. The standby hydraulic pump unit 501 is used to replace the main hydraulic pump unit 500 when the main hydraulic pump unit 500 fails. The single pressing zone hydraulic control unit 502 is used to control the pressure value of the shoe pressing hydraulic cylinder 209 independently.

[0050] The main hydraulic pump unit 500 is driven by a 110kW variable frequency motor to generate high pressure hydraulic oil, which can be used by subsequent actuators. This unit is suitable as the main hydraulic pressure source under normal operating conditions. The standby hydraulic pump unit 501 is similar to the main hydraulic pump unit 500, but its function is to be activated as the hydraulic pressure source when the main hydraulic pump unit 500 fails, since the equipment cannot be shut down for a long time. This main and standby configuration can improve production efficiency. The accumulator unit 504 mainly consists of a high-pressure oil tank, a one-way valve 508, a relief valve, and a pressure gauge. It stores energy in the hydraulic system to cope with sudden increases in demand, stabilize pressure, provide emergency power, absorb shocks, reduce energy consumption, and The hydraulic oil cooling unit 505 mainly consists of a screw pump, a 37kW variable frequency motor, a plate cooler, an oil filter, and a two-position two-way solenoid valve. During operation, the two-position two-way solenoid valve is first opened, then the screw pump draws hydraulic oil from the tank, pressurizes it, passes it through the oil filter and then through the plate cooler, and finally returns the cooled hydraulic oil to the tank. The hydraulic oil detection unit 506 primarily collects signals for the electrical control system. It uses a pressure transmitter 509 to detect oil pressure signals in real time, a temperature sensor to detect hydraulic oil temperature in real time, and a level sensor to monitor the amount of hydraulic oil in the tank in real time. These signals are transmitted to the control system for feedback, enabling the entire system to form a closed-loop control.

[0051] As the speed of the papermaking equipment increases, the paper (400mm undried) is prone to tearing defects. In this embodiment, pressure sensor signals are collected as feedback, and the pressure in the pressing zone is precisely controlled by the hydraulic system (in the shoe roll, multiple shoe pressure hydraulic cylinders 209 sometimes push the shoe pressure plate 207 to adjust the pressing zone pressure). At the same time, by monitoring the speed of the papermaking equipment, the control system automatically adjusts the set threshold of the hydraulic system.

[0052] The single-pressure-zone hydraulic control unit 502 is used to control the pressure value of a single pressure zone in the upper shoe roller 201 and lower shoe roller 202. Each of the upper shoe roller 201 and lower shoe roller 202 contains four pressure zones, and each pressure zone contains two shoe-pressure hydraulic cylinders 209. The purpose of the single-pressure-zone hydraulic control unit 502 is to precisely control the hydraulic oil pressure, thereby controlling the thrust of the hydraulic rod of the shoe-pressure hydraulic cylinder 209, thus ensuring precise control of the pressure value of the shoe-pressure plate 207 pressure zone. Figure 5As shown, the single-pressure zone hydraulic control unit 502 consists of an electromagnetic proportional directional valve 507, a check valve 508, and a pressure transmitter 509. The electromagnetic proportional directional valve 507 precisely controls the opening of the hydraulic valve through an electrical signal, thereby achieving precise regulation of the flow and direction in the hydraulic system. The pressure transmitter 509 transmits the monitored hydraulic oil pressure value to the electrical control system in real time through an electrical signal, making the entire system a closed-loop control system. The auxiliary hydraulic cylinder control unit 503 is mainly used to control the hydraulic cylinders in the tension roller 300, lifting roller 302, and blanket tension adjusting roller. It also uses a three-position four-way electromagnetic directional valve, a check valve, and a throttle valve to control these hydraulic cylinders.

[0053] Examples of the embodiments described above are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described above with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0056] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0057] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A double-boot type pressing device, characterized in that, include: A single-stage roller pressing mechanism, comprising an upper pressure roller and a lower pressure roller; A two-stage double-shoe pressing mechanism includes an upper shoe roller, a lower shoe roller, a roller, a reversing roller, and a rotation drive device. The rotation drive device is used to drive the roller to rotate. The roller is located between the upper shoe roller and the lower shoe roller. Both the upper shoe roller and the lower shoe roller have shoe pressing assemblies on the side facing the roller. The shoe pressing assembly includes a shoe pressing plate and a shoe pressing hydraulic cylinder. The side of the shoe pressing plate facing the roller has an arc-shaped surface, which is adapted to the outer peripheral surface of the roller. The shoe pressing hydraulic cylinder is used to drive the shoe pressing plate to move closer to or away from the roller. The paper passes sequentially between the upper pressure roller and the lower pressure roller, between the lower shoe roller and the roller, between the reversing roller, and between the upper shoe roller and the roller.

2. The double-boot press according to claim 1, characterized in that, The secondary double-shoe pressing mechanism also includes a screw motor and an adjustment component for correspondingly controlling the up-and-down movement of the lower shoe roller or the upper shoe roller. The adjustment component includes a shoe roller moving slide and a vertical guide rail. The shoe roller moving slide is fixedly connected to the lower shoe roller or the upper shoe roller, and the shoe roller moving slide is slidably connected to the vertical guide rail. The screw shaft of the screw motor is threadedly connected to the lower shoe roller or the upper shoe roller to drive the lower shoe roller or the upper shoe roller to move up and down.

3. The double-boot press according to claim 1, characterized in that, The double-shoe press device also includes a tension roller, which is located between the primary roller press mechanism and the secondary double-shoe press mechanism, and is used to tension the paper.

4. The double-boot press according to claim 1, characterized in that, The double-shoe pressing device also includes a blower, which is located above or below the primary roller pressing mechanism, with the blower's outlet facing the primary roller pressing mechanism.

5. The double-boot press according to claim 1, characterized in that, The shoe pressure assembly also includes a return spring, which is disposed in the cylinder body of the shoe pressure hydraulic cylinder. The return spring is used to assist the piston rod of the shoe pressure hydraulic cylinder to return to the initial position.

6. The double-shoe pressing device according to claim 1, characterized in that, The upper shoe roller and the lower shoe roller have grooves on the side facing the roller, and the shoe pressure hydraulic cylinder is installed in the grooves.

7. The double-boot press according to claim 1, characterized in that, The double-shoe press device also includes a lifting roller and a guide roller. The lifting roller is located below the guide roller. The lifting roller and the guide roller are used to clamp the upper blanket and the lower blanket, which are used to clamp the paper.

8. The double-boot press according to claim 7, characterized in that, The double-boot press device further includes an upper blanket tension adjusting roller and a lower blanket tension adjusting roller. The upper blanket tension adjusting roller is used to tension the upper blanket, and the lower blanket tension adjusting roller is used to tension the lower blanket.

9. The double-boot press according to claim 1, characterized in that, The double-shoe pressing device also includes a hydraulic system, which includes a main hydraulic pump unit, a backup hydraulic pump unit, and a single pressing zone hydraulic control unit. The main hydraulic pump unit is used to provide main hydraulic power to the first-stage roller pressing mechanism and the second-stage double-shoe pressing mechanism. The backup hydraulic pump unit is used to replace the main hydraulic pump unit when the main hydraulic pump unit fails. The single pressing zone hydraulic control unit is used to independently control the pressure value of the shoe pressing hydraulic cylinder.

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