Pulp molding equipment integrating pulp forming and drying

Abstract

The invention discloses a pulp molding device integrating pulp molding and drying, which relates to the technical field of pulp molding equipment. The device comprises a frame assembly, a molding device is provided in the middle and hot pressing and drying devices are provided on the left and right sides; a molding die in the molding device deposits pulp fibers to form wet molding pulp through vacuum negative pressure, and then the upper die of the hot pressing and drying device is shifted to perform the initial mold closing with the molding die, and after the upper die absorbs the wet blank through vacuum, it is translated and reset to be molded with the lower die for the second time, and hot pressing and drying are performed to form a dried finished product; a servo motor is used to control the lifting displacement and mold closing pressure of the molding die and the lower die, so as to realize high-precision, multi-parameter closed-loop control of mold closing, and combined with double-station alternating operation, the production efficiency is greatly improved, the energy consumption and maintenance cost are reduced, and the hydraulic oil leakage pollution of the transmission hydraulic drive is avoided, so as to realize efficient, environmentally friendly and intelligent production of pulp molding, and solve the technical problems of the existing hydraulic structure pulp molding equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp molding equipment, in particular to pulp molding equipment integrating pulp molding and drying. Background Art

[0002] As an environmentally friendly, biodegradable, and green product, molded pulp products are widely used in food packaging, industrial cushioning, electronic product packaging, and other fields. The production process of molded pulp products mainly includes pulping, molding, drying, and shaping. Molding and drying are the key steps that determine product quality and production efficiency.

[0003] Traditional pulp molding machines are mostly hydraulically driven, using hydraulic oil to transmit pressure and control the lifting and lowering movement of the upper mold, so that the pulp can be extruded and initially dehydrated in the mold.

[0004] Hydraulic drive is widely used in existing pulp molding equipment due to its ability to provide high pressing force. For example, a hydraulic cylinder lowers the upper mold, which engages the lower mold, compressing the pulp within the mold cavity and rapidly removing excess water, resulting in a denser molded body. While this hydraulic drive method offers superior pressure application, it also presents a number of drawbacks.

[0005] First, hydraulic systems suffer from slow response speeds, making it difficult to precisely control pressure and displacement during the hot press molding process, resulting in difficulties in ensuring consistent thickness and surface quality of finished products. Second, hydraulic systems are prone to oil leakage, which not only pollutes the environment but also affects the stable operation of the equipment and increases maintenance costs. Furthermore, the complex structure of hydraulic systems requires a large number of specialized technicians for commissioning and maintenance, resulting in high operational barriers and long downtimes, hindering the pulp molding industry from improving production efficiency and reducing production costs.

[0006] In recent years, with the widespread adoption of green environmental protection concepts and increasing market demand for high-quality pulp molded products, the industry urgently needs new integrated molding and drying equipment that can ensure molding quality while improving equipment response speed, simplifying maintenance procedures, and reducing environmental pollution risks. In particular, how to replace hydraulic drives in the molding process and effectively integrate them with the drying process has become a key technological challenge that urgently needs to be overcome.

[0007] In summary, it is found that the existing technology has at least the following technical problems:

[0008] Existing pulp molding equipment has technical problems such as complex hydraulic system structure, low production efficiency, and low integration of pulp molding and drying. Summary of the Invention

[0009] The purpose of the present invention is to provide a pulp molding equipment that integrates pulp molding and drying, so as to solve the technical problems of existing pulp molding equipment, such as complex hydraulic system structure, low production efficiency, and low integration of pulp molding and drying.

[0010] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0012] The present invention provides a pulp molding device that integrates pulp molding and drying, including a frame assembly, a molding device is provided in the middle of the length direction of the frame assembly, and hot pressing and drying devices are provided on both symmetrical sides of the molding device; a pulp box and a molding die that can be lifted and lowered vertically are provided in the molding device, a micropore array is provided on the molding surface of the molding die, the molding die is connected to an external vacuum unit through an air pipe, the molding die descends into the pulp box filled with pulp, and water is extracted by the negative pressure of the vacuum unit, so that the fibers of the pulp are evenly deposited on the molding surface of the molding die to form wet molded pulp; the hot pressing and drying device is provided with an upper mold that can be translated under the top frame of the frame assembly, a lower mold that can be lifted and lowered vertically and heated, and a positioning unit provided on the top frame of the frame assembly; the vacuum unit One of the negative pressure branches is connected to the upper mold through an air pipe; the positioning unit is used to locate the clamping position of the upper mold and the lower mold; the positioning unit unlocks the upper mold and moves it horizontally into the forming device, and the forming mold drives the wet forming pulp to rise to perform the initial clamping with the upper mold, and the vacuum unit restores the positive pressure of the forming mold, and the negative pressure of the upper mold absorbs the wet forming pulp on the forming mold, and the forming mold descends and opens the mold with the upper mold, and the upper mold is translated and reset to above the lower mold and positioned by the positioning unit, and the lower mold starts heating and rises to perform the secondary clamping with the upper mold, and the wet forming pulp is hot-pressed by the upper mold and the lower mold to form a dry pulp product, and the lower mold descends to open the clamping surface with the upper mold, and the dry pulp product is grabbed by a robot external to the frame assembly.

[0013] Among them, after the upper mold of one of the hot pressing and drying devices arranged symmetrically on both sides of the forming device is clamped with the forming mold, when the current upper mold is reset to dry the absorbed wet forming pulp, the forming mold descends and absorbs the precipitated wet forming pulp in the pulp box again; at the same time, the upper mold of the other hot pressing and drying device can be translated into the forming device, and when the forming mold rises again, it can be clamped with the upper mold in the forming device; the two hot pressing and drying devices alternately enter the forming device to clamp the mold, and such an alternating cycle can reduce the drying time of the forming device waiting for the hot pressing and drying device to dry the wet forming pulp, thereby improving the pulp forming-drying efficiency.

[0014] In one embodiment, the top frame of the frame assembly is provided with a translation unit, the slider of the translation unit is connected to the back of the upper mold, and the translation servo motor of the translation unit drives the upper mold to translate back and forth between the hot pressing and drying device and the forming device through a chain transmission.

[0015] In one embodiment, the forming device includes a lifting frame, a servo electric cylinder and the forming mold arranged on the top frame of the frame assembly; in the vertical direction, a plurality of first guide columns are provided on the lower bottom surface of the lifting frame, and a plurality of first linear bearings corresponding to the positions of the guide columns are provided on the top frame of the frame assembly, and the plurality of first guide columns are respectively slidably connected to the plurality of first linear bearings; the first guide columns extend into the frame assembly and are connected to the forming mold; the base of the servo electric cylinder is connected and fixed to the top frame of the frame assembly, and the telescopic end of the servo electric cylinder is connected to the inner top surface of the lifting frame, and the servo electric cylinder drives the lifting frame to rise or fall, and the lifting frame drives the forming mold to rise or fall in the pulp box, and drives the forming mold to close or open the upper mold.

[0016] In one embodiment, a first negative pressure cavity is provided between the molding surface and the back surface of the molding mold, and a first negative pressure interface is provided on the side of the molding mold to connect with the first negative pressure cavity and the vacuum unit.

[0017] In one embodiment, a suction hole array is provided on the molding surface of the upper mold and the lower mold, and a second negative pressure cavity is provided between the molding surface and the back side of the upper mold and the lower mold, and the second negative pressure cavity is connected to the vacuum unit through an air pipe.

[0018] In one embodiment, positioning clips are provided on two opposite sides of the upper mold, and one positioning unit is arranged on each opposite side of the upper mold; the positioning unit includes a positioning cylinder, a positioning slide rail, a positioning slider and a positioning block; the positioning cylinder and the positioning slide rail are sequentially installed in the grooves of the top frame of the frame assembly corresponding to the side surfaces of the upper mold from top to bottom; the mounting portion of the positioning block is connected to the positioning slider, the positioning slider is slidably connected to the positioning slide rail, and the telescopic end of the positioning cylinder is connected to the mounting portion of the positioning block; during positioning, the telescopic end of the positioning cylinder drives the positioning block to slide downward, and the positioning portion of the positioning block abuts against the positioning clip to position the upper mold and cooperate with the translation unit to interlock the position of the upper mold.

[0019] In one embodiment, a heating plate, a base, a connecting rod assembly and a base are sequentially provided under the lower mold; the heating plate is equipped with a built-in temperature sensor for real-time monitoring of the temperature of the heating plate to control the temperature of the drying and molding pulp; the two ends of the connecting rod assembly are respectively connected to the base and the base, for providing travel limits for the lifting and lowering of the base; the base is provided on the bottom frame of the frame assembly; linear guide sleeves are provided at mutually corresponding positions of the edge of the base and the edge of the base, and a second guide column is slidably sleeved in the linear guide sleeve, and the two ends of the second guide column are respectively connected to the top frame and the bottom frame of the frame assembly, for providing guidance for the lifting and lowering of the base; a lifting unit is installed on the base, and the transmission block of the lifting unit is connected to the connecting rod assembly and drives the lower mold to lift and lower.

[0020] In one embodiment, the connecting rod assembly includes a first connecting rod, a second connecting rod and a third connecting rod; one end of the first connecting rod is rotatably connected to the rotating seat on the base, the other end of the first connecting rod is connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting ear of the base; one end of the third connecting rod is rotatably connected to the connecting ear of the first connecting rod, and the other end is rotatably connected to the connecting ear of the transmission block.

[0021] In one embodiment, the lifting unit includes the transmission block, a guide frame, a transmission screw, a transmission nut and a lifting servo motor; the guide frame is mounted on the base and placed at the center of the base, and third guide columns are respectively mounted on both sides of the guide frame, and the transmission screw is arranged between the two third guide columns; the lifting servo motor is arranged on one side of the base, and the rotating end of the lifting servo motor extends vertically out of the bottom of the base; the two ends of the transmission screw are respectively rotatably connected to the top of the guide frame and the base, and one end of the transmission screw passes through the base to extend to the bottom and is connected to the rotating end of the lifting servo motor through a sprocket and a chain; the transmission nut is mounted on the transmission block; the transmission block is arranged in the guide frame, slidably connected to the third guide column, and is transmission-connected to the transmission screw through the transmission nut; an auxiliary cylinder is provided on the bottom frame of the frame assembly, and the telescopic end of the auxiliary cylinder extends out and abuts against the bottom of the base before the lower mold is raised, so as to reduce the driving load of the lifting servo motor.

[0022] In one embodiment, a mold adjusting motor is also installed on the base; the linear guide sleeve on the base is outer-circuited with a T-threaded rod to form a T-threaded guide rod, and the T-threaded guide rod is externally connected to a transmission threaded sleeve, and the transmission threaded sleeve is fixedly connected to the base; one end of multiple T-threaded rods is located above the base, and is transmission-connected to the rotating end of the mold adjusting motor through a sprocket and a transmission chain; the other end of multiple T-threaded rods is located under the base and is rotationally connected to the bottom frame of the frame assembly; the mold adjusting motor drives the T-threaded rod to rotate, driving the base connected to the transmission threaded sleeve to rise and fall, so as to adjust the overall starting height of the base, the base and the lower mold, thereby improving the adaptability of the size type of the lower mold.

[0023] The pulp molding equipment provided by the present invention, which integrates pulp forming and drying, is an innovative solution to the problems of the existing pulp molding equipment, such as complex hydraulic system structure, low production efficiency, and low integration of molding and drying. It has the following significant beneficial effects:

[0024] (1) High-precision intelligent drying control

[0025] The present invention adopts a servo motor to control the merging of the lower mold and the upper mold. The servo motor has a built-in encoder that can accurately control the speed and torque of the mold closing, thereby accurately controlling the mold closing pressure. The secondary mold closing pressure is controlled within 20-780kN. It is also equipped with a heating plate and a built-in temperature sensor and a connected controller with a PLC control system. By real-time monitoring of the mold cavity temperature, pressure and displacement, and applying a PID algorithm, multi-parameter closed-loop precise control of the hot pressing process of the upper and lower molds is achieved. Compared with traditional hydraulic drive, the drying temperature control of wet-formed pulp during the drying process is more precise and the pressure application is more stable, which effectively improves the drying uniformity and consistency of the finished product, greatly reduces the scrap rate, and ensures product quality.

[0026] (2) High-efficiency production and double-station circulation

[0027] The present invention utilizes a double-station hot pressing and drying device to alternately enter the forming device for secondary mold closing and drying, thereby avoiding the idle waiting of the forming device station when a single hot pressing and drying device is working; the servo motor built into the forming device has a fast response and sensitive start and stop, shortens the hot pressing cycle, and cooperates with vacuum adsorption forming and PLC control system to accurately control the pulp pump flow, so that the forming mold can quickly form wet forming pulp in the pulp box, realizing the efficient linkage between the initial forming and hot pressing drying of the forming pulp, greatly improving the overall production efficiency, and meeting the needs of large-scale continuous production.

[0028] (3) Low maintenance and reduced operating costs

[0029] This invention completely eliminates the hydraulic system, eliminating the risk of oil leaks and environmental pollution, while significantly reducing the need for hydraulic seal replacement and system maintenance. The simple structure of the servo motor and its transmission mechanism, combined with a PLC control system, allows for rapid troubleshooting and convenient repairs, effectively reducing maintenance costs and downtime.

[0030] (4) Energy conservation and environmental protection

[0031] The servo motors of the molding device and the hot pressing and drying device both have the advantage of outputting torque on demand, which can significantly save electricity compared to the constant load mode of the traditional hydraulic system. In addition, the pulp molding equipment of the present invention does not require hydraulic oil, which completely avoids the pollution of oil leakage to the environment and pulp products, and meets the requirements of green manufacturing and sustainable development.

[0032] In summary, the present invention not only solves the technical pain points of existing pulp molding equipment, such as separation of molding and drying, slow response of the hydraulic system, oil leakage pollution, and low production efficiency, but also realizes a new technical route of integrated pulp molding and drying, high precision, high efficiency, low energy consumption, and environmental friendliness through the intelligent control and structural innovation formed by the PLC control system combined with the use of the PID algorithm, which has significant economic benefits and industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic side view of the overall structure of the pulp molding equipment of the present invention;

[0035] Figure 2 It is a partial top view structural schematic diagram of the pulp molding equipment of the present invention;

[0036] Figure 3 This is a schematic diagram of the overall axonometric structure of the pulp molding equipment of the present invention;

[0037] Figure 4 It is a schematic diagram of a top view and partial cross-section of the forming die of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the upper mold of the present invention when viewed from above;

[0039] Figure 6 It is a schematic diagram of a partial cross-sectional structure of the upper mold of the present invention in a side view;

[0040] Figure 7 It is a schematic diagram of a partial cross-sectional structure of the lower mold of the present invention in a side view;

[0041] Figure 8 It is a schematic diagram of the matching structure of the upper mold and the positioning unit of the present invention;

[0042] Figure 9 Schematic diagram of the isometric structure of the lower die portion of the hot pressing and drying device of the present invention;

[0043] Figure 10 It is a side structural schematic diagram of the lower mold part of the hot pressing and drying device of the present invention.

[0044] The accompanying drawings are numerals as follows:

[0045] 1. Frame assembly; 11. Top frame; 12. Bottom frame; 13. Translation unit; 131. Translation servo motor;

[0046] 2. Forming device; 21. Slurry box; 22. Forming die; 221. First negative pressure chamber; 222. First negative pressure interface; 223. Micropore array; 23. Lifting frame; 231. First guide column; 232. First linear bearing; 24. Servo cylinder;

[0047] 3. Hot pressing and drying device; 31. Upper mold; 311. Positioning fixture; 32. Lower mold; 33. Suction hole array; 34. Second negative pressure chamber; 35. Positioning unit; 351. Positioning cylinder; 352. Positioning rail; 353. Positioning slider; 354. Positioning block; 36. Heating plate; 37. Base; 38. Connecting rod assembly; 381. First connecting rod; 382. Second connecting rod; 383. Third connecting rod; 39. Base; 391. Mold adjustment motor; 392. T-threaded rod; 393. Transmission threaded sleeve;

[0048] 41. Linear guide sleeve; 42. Second guide post;

[0049] 5. Lifting unit; 51. Transmission block; 52. Guide frame; 521. Third guide column; 53. Transmission screw; 54. Transmission nut; 55. Lifting servo motor;

[0050] 6. Auxiliary cylinder. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0052] In a specific embodiment, a pulp molding device integrating pulp molding and drying is provided, including a frame assembly, a molding device is provided in the middle and hot pressing and drying devices are provided on the left and right sides; the molding mold in the molding device deposits pulp fibers through vacuum negative pressure to form wet molding pulp, and then the upper mold of the hot pressing and drying device is shifted to perform the initial mold closing with the molding mold, and after the upper mold adsorbs the wet blank through vacuum, it is translated and reset to be molded with the lower mold for the second time, and hot pressing and drying are performed to form a dry finished product; a servo motor is used to control the lifting displacement and mold closing pressure of the molding mold and the lower mold to achieve high-precision, multi-parameter closed-loop control of the mold closing control, combined with double-station alternating operation, greatly improves production efficiency, reduces energy consumption and maintenance costs, avoids hydraulic oil leakage pollution of the transmission hydraulic drive, and realizes efficient, environmentally friendly and intelligent production of pulp molding; effectively solves the technical problems of existing pulp molding equipment, such as complex hydraulic system structure, low production efficiency, and low integration of pulp molding and drying.

[0053] A first embodiment of a pulp molding apparatus is Figures 1 to 10As shown, it includes a frame assembly 1, a forming device 2 is provided in the middle of the length direction of the frame assembly 1, and hot pressing and drying devices 3 are provided on both symmetrical sides of the forming device 2; a pulp box 21 and a forming die 22 that can be lifted vertically are provided in the forming device 2, and a microporous array 223 is provided on the forming surface of the forming die 22, and the forming die 22 is connected to an external vacuum unit through an air pipe. The forming die 22 descends into the pulp box 21 filled with pulp, and the water is extracted by the negative pressure of the vacuum unit, so that the pulp fibers are evenly deposited on the forming surface of the forming die 22 to form wet-formed pulp; the hot pressing and drying device 3 is provided with an upper die 31 that can be translated under the top frame 11 of the frame assembly 1, a lower die 32 that can be lifted vertically and heated, and a positioning unit 35 provided on the top frame 11 of the frame assembly 1; one of the vacuum units The negative pressure branch is connected to the upper mold 31 through the air pipe; the positioning unit 35 is used to locate the clamping position of the upper mold 31 and the lower mold 32; the positioning unit 35 unlocks the upper mold 31 and moves it horizontally into the forming device 2, and the forming mold 22 drives the wet forming pulp to rise to perform the initial clamping with the upper mold 31. The vacuum unit restores the positive pressure of the forming mold 22, and the negative pressure of the upper mold 31 absorbs the wet forming pulp on the forming mold 22. The forming mold descends and opens the mold with the upper mold 31. The upper mold 31 is translated and reset to above the lower mold 32 and is positioned by the positioning unit 35. The lower mold 32 starts heating and rises to perform the secondary clamping with the upper mold 31. The wet forming pulp is hot-pressed by the upper mold 31 and the lower mold 32 to form a dry pulp product. The lower mold 32 descends to open the clamping surface with the upper mold 31, and the dry pulp product is grabbed by a robot arm external to the frame assembly 1.

[0054] The slurry box 21 is connected to a slurry pump through a slurry conveying pipe, which is used to continuously inject slurry into the slurry box 21;

[0055] It also includes a controller, which is electrically connected to the forming device 2, the hot pressing and drying device 3, the vacuum unit and the slurry pump, and a PLC (programmable logic controller) control system is integrated in the controller.

[0056] Specifically, the controller controls the output flow of the slurry pump to ensure that the slurry is stably supplied to the slurry box 21 and maintains the stability of the slurry water level in the slurry box 21.

[0057] In addition, after the upper mold 31 of one of the hot pressing and drying devices 3 arranged symmetrically on both sides of the forming device 2 is closed with the forming mold 22, when the upper mold 31 is reset to dry the absorbed wet forming pulp, the forming mold 22 descends and absorbs the precipitated wet forming pulp in the pulp box 21 again; at the same time, the upper mold 31 of the other hot pressing and drying device 3 can be translated into the forming device 2, and when the forming mold 22 rises again, it can be closed with the upper mold 31 in the forming device 2; the two hot pressing and drying devices 3 alternately enter the forming device 2 to close the mold, and such an alternating cycle can reduce the drying time of the forming device 2 waiting for the hot pressing and drying device 3 to dry the wet forming pulp, thereby improving the pulp forming-drying efficiency.

[0058] The pulp molding equipment provided by the present invention is an innovative solution to the problems of complex hydraulic system structure, low production efficiency, and low integration of molding and drying in existing pulp molding equipment. It has the following advantages:

[0059] High-precision intelligent drying control: The hot pressing drying device 3 uses a servo motor to control the merging of the lower mold 32 and the upper mold 31. The servo motor has a built-in encoder that can accurately control the speed and torque of the mold closing, thereby accurately controlling the mold closing pressure. The secondary mold closing pressure is controlled within a range of 20-780kN. It is also equipped with a heating plate 36 and a built-in temperature sensor and a connected controller with a PLC control system. By monitoring the mold cavity temperature, pressure and displacement in real time and applying the PID (proportional, integral, differential control) algorithm, a multi-parameter closed-loop precise control of the hot pressing process of the upper mold 31 and the lower mold 32 is achieved. Compared with traditional hydraulic drive, the drying temperature control of wet-molded pulp during the drying process is more precise and the pressure application is more stable, effectively improving the drying uniformity and the consistency of the finished product, significantly reducing the scrap rate and ensuring product quality.

[0060] High-efficiency production and double-station cycle work together: the double-station hot pressing and drying device 3 is used to alternately enter the forming device 2 for secondary mold closing and drying, avoiding the idle waiting of the forming device 2 station when a single hot pressing and drying device 3 is working; the built-in servo motor of the forming device 2 responds quickly, starts and stops sensitively, and the hot pressing cycle is shortened. Combined with vacuum adsorption forming and PLC control system, the pulp pump flow is accurately controlled, so that the forming mold 22 can quickly form wet forming pulp in the pulp box 21, realizing the efficient linkage between the initial forming and hot pressing drying of the forming pulp, greatly improving the overall production efficiency, and meeting the needs of large-scale continuous production.

[0061] Low maintenance and reduced operating costs: This solution completely eliminates the hydraulic system, eliminating oil leaks and environmental risks while significantly reducing the need for hydraulic seal replacement and system maintenance. The simple structure of the servo motor and its transmission mechanism, combined with a PLC control system, allows for rapid troubleshooting and easy repairs, effectively reducing maintenance costs and downtime.

[0062] Energy saving and environmental protection: The servo motors of the molding device 2 and the hot pressing and drying device 3 both have the advantage of outputting torque on demand, which can significantly save electricity compared with the constant load mode of the traditional hydraulic system; and the pulp molding equipment of the present invention does not require hydraulic oil, which completely avoids the pollution of oil leakage to the environment and pulp products, and meets the requirements of green manufacturing and sustainable development.

[0063] In summary, the present invention not only solves the technical pain points of existing pulp molding equipment, such as separation of molding and drying, slow response of the hydraulic system, oil leakage pollution, and low production efficiency, but also realizes a new technical route of integrated pulp molding and drying, high precision, high efficiency, low energy consumption, and environmental friendliness through the intelligent control and structural innovation formed by the PLC control system combined with the use of the PID algorithm, which has significant economic benefits and industrial application value.

[0064] As one optional implementation method:

[0065] Regarding the specific structure of driving the upper mold 31 to move horizontally on the frame assembly 1, this embodiment is as follows. Figure 2 and Figure 3 As shown, the top frame 11 of the frame assembly 1 is provided with a translation unit 13, the slider of the translation unit 13 is connected to the back of the upper mold 31, and the translation servo motor 131 of the translation unit 13 drives the upper mold 31 to translate back and forth between the hot pressing and drying device 3 and the forming device 2 through a chain drive.

[0066] During operation, the translation unit 13 drives the sprocket via the translation servo motor 131, driving the chain to reciprocate horizontally, thereby pulling the slider connected to the chain to translate along the guide rail. The slider is fixedly connected to the back of the upper mold 31, allowing the upper mold 31 to move smoothly and quickly between the hot press drying unit 3 and the forming unit 2.

[0067] This translation mechanism utilizes a servo motor to precisely control the translation stroke and speed, ensuring that the upper mold 31 accurately aligns with the forming mold 22 or lower mold 32, improving the equipment's response speed and positioning accuracy. Compared to traditional hydraulic or pneumatic propulsion, it avoids the problems of slow hydraulic system response, oil leakage, and high pneumatic impact force.

[0068] The translation servo motor 131 is integrated with an encoder, which is connected to the PLC control system of the controller to achieve real-time monitoring and closed-loop control of the translation position of the upper mold 31.

[0069] Regarding the specific structure of the molding device 2, this embodiment Figure 1 、 Figure 3 and Figure 4As shown, the forming device 2 includes a lifting frame 23, a servo electric cylinder 24 and a forming mold 22 arranged on the top frame 11 of the frame assembly 1; in the vertical direction, a plurality of first guide columns 231 are provided on the lower bottom surface of the lifting frame 23, and a plurality of first linear bearings 232 corresponding to the positions of the guide columns are provided on the top frame 11 of the frame assembly 1, and the plurality of first guide columns 231 are respectively slidably connected in the plurality of first linear bearings 232; the first guide columns 231 extend into the frame assembly 1 and are connected to the forming mold 22; the base 37 of the servo electric cylinder 24 is fixedly connected to the top frame 11 of the frame assembly 1, and the telescopic end of the servo electric cylinder 24 is connected to the inner top surface of the lifting frame 23, and the servo electric cylinder 24 drives the lifting frame 23 to rise or fall, and the lifting frame 23 drives the forming mold 22 to rise or fall in the slurry box 21, and drives the forming mold 22 to close or open the upper mold 31.

[0070] During operation, the servo cylinder 24 receives commands from the controller and controls the lifting frame 23 to vertically raise and lower the first guide post 231 and the connected forming die 22. During descent, the forming die 22 is immersed in the pulp box 21, where the vacuum negative pressure forms the pulp fibers. During ascent, the wet forming pulp is brought to a height where it can be closed with the upper die 31.

[0071] The precise displacement feedback provided by the servo cylinder 24 enables multi-stage speed control and slow start and stop of the forming die 22, reducing mechanical shock and ensuring uniform slurry deposition and forming accuracy. Compared to hydraulic cylinders, the servo cylinder 24 offers faster response, higher precision, and significantly lower operating energy consumption.

[0072] Regarding the specific structure of the molding die 22, this embodiment Figure 3 and Figure 4 As shown, a first negative pressure cavity 221 is provided between the molding surface and the back surface of the molding die 22 , and a first negative pressure interface 222 is provided on the side of the molding die 22 to connect with the first negative pressure cavity 221 and the vacuum unit.

[0073] During use, after the forming die 22 descends into the slurry box 21, the first negative pressure chamber 221 connects to the vacuum unit via the first negative pressure interface 222, rapidly extracting moisture from the slurry, allowing the fibers to be evenly deposited on the forming surface, forming a preliminary wet blank. After the extraction is complete and the forming die 22 rises and releases the slurry, the negative pressure chamber can quickly switch to a positive pressure state to assist in demolding or prevent slurry backflow. The arrangement of the micropore array 223 on the forming die 22 ensures more uniform moisture removal during slurry molding, promoting consistent product thickness. Compared to traditional mold structures, this design improves fiber distribution uniformity and molding efficiency.

[0074] In addition, the forming surface of the forming mold 22 is divided into multiple suction zones, and its first negative pressure chamber 221 is provided with multiple zoned suction pipelines. The multiple suction zones realize differentiated negative pressure suction in different areas through the corresponding zoned suction pipelines to deposit wet pulp blanks with different wall thicknesses or functional areas, thereby producing pulp products with differentiated regional wall thicknesses.

[0075] Regarding the specific structure of the upper mold 31 and the lower mold 32, this embodiment is as follows: Figure 1 、 Figure 5 、 Figure 6 and Figure 7 As shown, a suction hole array 33 is provided on the molding surface of the upper mold 31 and the lower mold 32, and a second negative pressure cavity 34 is provided between the molding surface and the back surface of the upper mold 31 and the lower mold 32. The second negative pressure cavity 34 is connected to the vacuum unit through an air pipe.

[0076] During application, the second negative pressure chambers 34 of the upper and lower molds 31, 32 communicate with the mold surface via an array of suction holes 33. This applies negative pressure when the upper mold 31 absorbs wet pulp or when the lower mold 32 assists in forming. This enhances the absorption, dehydration, and positioning of the product, preventing displacement during transfer or hot pressing. Heating the suction holes in the lower and upper molds 32, 31, simultaneously facilitates absorption and heat conduction, facilitating rapid moisture removal and improving drying efficiency.

[0077] This structure solves the problem of insufficient adsorption force of the traditional upper mold 31 and the lower mold 32, which causes the product to fall off or deform.

[0078] In addition, the heating plate 36 of the lower mold 32 is further provided with multiple local reliable heating zones, and a local controllable heating zone is integrated in the suction hole array 33 area. The local temperatures of multiple areas are independently controlled to achieve directional drying of different areas of the product.

[0079] Regarding the positioning structure of the positioning unit 35 and the upper mold 31 matched therewith, this embodiment is as follows. Figure 2 、 Figure 3 and Figure 8 As shown, positioning clips 311 are provided on the opposite sides of the upper mold 31, and a positioning unit 35 is arranged on the opposite sides of the upper mold 31 respectively; the positioning unit 35 includes a positioning cylinder 351, a positioning slide rail 352, a positioning slider 353 and a positioning block 354; the positioning cylinder 351 and the positioning slide rail 352 are installed in sequence from top to bottom in the grooves on the side of the upper mold 31 of the top frame 11 of the frame assembly 1; the mounting portion of the positioning block 354 is connected to the positioning slider 353, the positioning slider 353 is slidably connected to the positioning slide rail 352, and the telescopic end of the positioning cylinder 351 is connected to the mounting portion of the positioning block 354; during positioning, the telescopic end of the positioning cylinder 351 drives the positioning block 354 to slide downward, and the positioning portion of the positioning block 354 abuts against the positioning clip 311 to position the upper mold 31 and cooperate with the translation unit 13 to interlock the position of the upper mold 31.

[0080] During application, after the translation unit 13 moves the upper mold 31 to the mold closing position matching the lower mold 32, the positioning cylinder 351 extends to push the positioning slider 353 downward, so that the positioning part of the positioning block 354 is precisely matched with the positioning clips 311 on both sides of the upper mold 31, fixing the upper mold 31 in a predetermined position to prevent displacement during the hot pressing mold closing process.

[0081] In order to reduce the wear caused by the contact between the positioning block 354 and the positioning clamp 311 , a pulley is installed at the end of the positioning portion of the positioning block 354 .

[0082] The positioning unit 35 is interlocked with the translation unit 13 to ensure coordination of translation and positioning. This solution achieves fast and reliable mechanical locking of the upper mold 31, which is more stable and shock-resistant than pure electric positioning methods.

[0083] In addition, a position sensor is integrated on the positioning cylinder 351 and electrically connected to the controller. By measuring the extended length and the retracted length, the measured length data is fed back to the PLC control system of the controller for real-time monitoring of the positioning status and joint scheduling of the translation unit 13 to interlock the reset position of the upper mold 31.

[0084] Regarding the specific structure of heating and lifting of the lower mold 32, this embodiment is as follows. Figure 1 、 Figure 7 、 Figure 9 and Figure 10 As shown, a heating plate 36, a base 37, a connecting rod assembly 38 and a base 39 are sequentially arranged under the lower mold 32; the heating plate 36 is equipped with a built-in temperature sensor for real-time monitoring of the temperature of the heating plate 36 to control the temperature of the drying and molding pulp; the two ends of the connecting rod assembly 38 are respectively connected to the base 37 and the base 39, for providing travel limits for the lifting and lowering of the base 37; the base 39 is arranged on the bottom frame 12 of the frame assembly 1; linear guide sleeves 41 are provided at corresponding positions of the edges of the base 39 and the edges of the base 37, and a second guide column 42 is slidably sleeved in the linear guide sleeve 41, and the two ends of the second guide column 42 are respectively connected to the top frame 11 and the bottom frame 12 of the frame assembly 1, for providing guidance for the lifting and lowering of the base 37; a lifting unit 5 is installed on the base 39, and the transmission block 51 of the lifting unit 5 is connected to the connecting rod assembly 38 and drives the lower mold 32 to rise and fall.

[0085] The controller is electrically connected to the heating plate 36 and the temperature sensor, and the temperature sensor transmits the temperature data to the controller. The controller automatically and dynamically adjusts the heating power of the heating plate 36 through the PID algorithm according to the preset drying process parameters, thereby controlling the temperature of the drying pulp.

[0086] During use, the heating plate 36 and temperature sensor of the lower mold 32 are electrically connected to the controller, controlling the heating of the heating plate 36. The built-in temperature sensor collects the temperature in real time and feeds it back to the controller. The controller precisely adjusts the heating power based on a PID algorithm to maintain a constant drying temperature range (e.g., 180-220°C) and ensure uniform hot pressing and drying. The lifting mechanism drives the base 37 and connecting rod assembly 38 up and down via the transmission screw 53, allowing the lower mold 32 to complete the mold closing or demolding action. The connecting rod assembly 38 not only transmits the lifting force but also limits the travel range, ensuring smooth lifting and preventing overshoot. The telescopic end of the auxiliary cylinder 6 extends before the lower mold 32 rises and pre-supports the base 37, reducing the starting load of the servo motor, improving energy efficiency, protecting the servo motor's durability, and enhancing reliability. Compared with hydraulic lifting, this structure has a faster response and higher positioning accuracy.

[0087] Regarding the specific transmission structure of the connecting rod assembly 38, this embodiment Figure 9 As shown, the connecting rod assembly 38 includes a first connecting rod 381, a second connecting rod 382 and a third connecting rod 383; one end of the first connecting rod 381 is rotatably connected to the rotating seat on the base 39, the other end of the first connecting rod 381 is connected to one end of the second connecting rod 382, ​​and the other end of the second connecting rod 382 is rotatably connected to the connecting ear of the base 37; one end of the third connecting rod 383 is rotatably connected to the connecting ear of the first connecting rod 381, and the other end is rotatably connected to the connecting ear of the transmission block 51.

[0088] During operation, the connecting rod assembly 38 rotates the transmission screw 53 via the servo motor, which then drives the transmission block 51 up and down through the linear movement of the transmission nut 54. The transmission block 51 is connected to the third connecting rod 383. Through the articulation and rotation of multiple connecting rod sections, the linear displacement of the screw is converted into a smooth raising and lowering of the base 37. This connecting rod structure optimizes the lifting stroke and mechanical force transmission, reducing the load on the motor drive. Compared to traditional hydraulic single-cylinder direct-push structures, this connecting rod mechanism provides more precise stroke control and more uniform force distribution, thereby reducing mechanical wear.

[0089] Regarding the specific transmission structure of the lifting unit 5, this embodiment is as follows: Figure 1 、 Figure 3 and Figure 10As shown, the lifting unit 5 includes a transmission block 51, a guide frame 52, a transmission screw 53, a transmission nut 54 and a lifting servo motor 55; the guide frame 52 is installed on the base 39 and is placed at the center of the base 37. Third guide columns 521 are installed on both sides of the guide frame 52, and a transmission screw 53 is arranged between the two third guide columns 521; the lifting servo motor 55 is set on one side of the base 39, and the rotating end of the lifting servo motor 55 extends vertically from the bottom of the base 39; the two ends of the transmission screw 53 are respectively connected to the top and base of the guide frame 52. 39 is rotatably connected, and one end of the transmission screw 53 passes through the base 39 to the bottom and is connected to the rotating end of the lifting servo motor 55 through a sprocket and a chain; the transmission nut 54 is installed on the transmission block 51; the transmission block 51 is arranged in the guide frame 52, is slidably connected to the third guide column 521, and is connected to the transmission screw 53 through the transmission nut 54; an auxiliary cylinder 6 is provided on the base 12 of the frame assembly 1, and the telescopic end of the auxiliary cylinder 6 is extended before the lower mold 32 is raised to abut against the bottom of the base 37, so as to reduce the driving load of the lifting servo motor 55.

[0090] During operation, the lifting servo motor 55 drives the sprocket to rotate, which in turn drives the transmission screw 53 via a chain drive, causing the transmission nut 54 to move axially along the screw. This, in turn, drives the third connecting rod 383 to swing via the transmission block 51, thereby controlling the lifting and lowering of the lower mold 32. The transmission block 51 slides up and down along the third guide column 521 within the guide frame 52, ensuring smooth lifting and no swinging. Before the lower mold 32 is raised, the auxiliary cylinder 6 extends out of the support base 37 in advance to share some of the load, significantly reducing the instantaneous load peak of the servo motor and improving the system's energy efficiency. Compared to hydraulic systems, this solution offers faster response and higher positioning accuracy.

[0091] A second embodiment of the pulp molding apparatus is Figure 1 、 Figure 9 and Figure 10 As shown, the difference between this embodiment and the first embodiment is that when replacing upper molds 31 and lower molds 32 of different sizes, due to the stroke limitation of the connecting rod assembly 38, the debugging of the mold is too cumbersome when replacing the mold; the base 39 is set to have a lifting function, so that the base 39 drives the base 37, the heating plate 36 and the lower mold 32 to rise and fall as a whole, while the upper mold 31 does not need an adjuster height, and can be adjusted and matched through the base 39.

[0092] Specifically, the specific lifting structure of the base 39 is as follows: a mold adjusting motor 391 is also installed on the base 39; the linear guide sleeve 41 on the base 39 is covered with a T-threaded rod 392 to form a T-threaded guide rod, and the T-threaded guide rod is externally connected to a transmission threaded sleeve 393, and the transmission threaded sleeve 393 is fixedly connected to the base 39; one end of multiple T-threaded rods 392 is located above the base 39, and is transmission-connected to the rotating end of the mold adjusting motor 391 through a sprocket and a transmission chain; the other end of multiple T-threaded rods 392 is located below the base 39 and is rotationally connected to the bottom frame 12 of the frame assembly 1; the mold adjusting motor 391 drives the T-threaded rod 392 to rotate, driving the base 39 connected to the transmission threaded sleeve 393 to rise and fall, which is used to adjust the overall starting height of the base 39, the base 37 and the lower mold 32, and improve the adaptability of the size type of the lower mold 32.

[0093] At the same time, the lifting and lowering of the base 39 is also guided by the second guide column 42, so that the lifting and lowering of the base 39 is smoother, and the positioning accuracy of the base 39 is further improved.

[0094] In practical application, the key technical feature of this embodiment lies in the design of a movable base 39, which was originally fixed. A mold adjustment motor 391 drives multiple T-shaped threaded rods 392, which move the base 39 up and down as a whole, enabling precise adjustment of the initial height of the lower mold 32. Simultaneously, the second guide post 42 also serves as a guide for the base 39's elevation, ensuring a smooth and offset-free lifting process. This structure overcomes the fixed travel limitations of the connecting rod assembly 38, allowing the initial and clamping heights of the base 37 of the lower mold 32 to be flexibly adjusted to accommodate molds of varying sizes.

[0095] In actual production, when the upper and lower molds 31 and 32 need to be replaced with different heights or sizes, the operator first replaces the upper and lower molds 31 and 32 and, through the control system, inputs the displacement value of the base 39 to be raised or lowered to the mold adjustment motor 391. The mold adjustment motor 391 drives the sprocket and chain to rotate, driving the T-threaded rod 392 to rotate, thereby causing the transmission threaded sleeve 393 to move up and down along the T-threaded rod 392, driving the entire base 39 to rise and fall. After the base 39 is raised or lowered, the overall height of the base 37, heating plate 36, and lower mold 32 can be adjusted to align the lower mold 32 with the corresponding working position of the new upper mold 31.

[0096] Since the overall height of the base 39 and the base 37 can be flexibly adjusted, the problem of requiring major modifications to the connecting rod mechanism or the position of the upper mold 31 during traditional mold changes is avoided; the entire mold adjustment process can be automatically controlled by PLC or manually fine-tuned to adapt to different process requirements.

[0097] Accordingly, the lifting and lowering adjustment of the base 39 significantly simplifies the mold replacement process, shortens the mold change time, and improves the switching efficiency of the production line. It also avoids the problem of mismatching the clamping height of the upper mold 31 and the lower mold 32 caused by the limitation of the stroke of the connecting rod assembly 38, thereby improving the adaptability of the equipment to different mold sizes.

[0098] Moreover, the overall lifting and lowering of the base 39 is smooth and the positioning is precise, which ensures the accuracy and pressing quality when the lower mold 32 and the upper mold 31 are closed; the mold adjustment no longer requires complex adjustments to the translation stroke or height of the upper mold 31, which simplifies the equipment structure and operating steps; and improves the flexible production capacity of the equipment to better meet the needs of co-production of multiple specifications and multiple products.

[0099] The invention effectively solves the technical problem that the traditional connecting rod mechanism has a fixed stroke, which results in multiple tedious debugging of the upper mold 31 or the lower mold 32 when replacing molds of different sizes, which is time-consuming and labor-intensive.

[0100] By lifting the base 39 as a whole, the starting height of the lower mold 32 can be accurately matched quickly, eliminating the height adjustment step of the upper mold 31, and greatly improving the production mold change efficiency and production line flexibility.

[0101] The collaborative work flow of the forming device 2 and the hot pressing and drying device 3 is divided into a forming stage, a wet blank transfer stage, a drying stage and a demoulding stage, which are carried out in sequence.

[0102] Specifically, in the forming stage: the controller controls the pulp pump to stably supply pulp to the pulp box 21, the translation servo motor 131 drives the upper mold 31 to translate along the guide rail to the top of the forming mold 22 through the chain drive, and the external vacuum system is started to form a negative pressure in the first negative pressure chamber 221 of the forming mold 22, so that the moisture in the pulp is extracted through the micropores, and the fibers are evenly deposited on the forming surface of the forming mold 22 to complete the pulp adsorption forming, forming a wet formed pulp (wet blank), and the servo electric cylinder 24 drives the forming mold 22 to rise to the mold closing position with the upper mold 31, and completes the initial mold closing with the upper mold 31.

[0103] Wet blank transfer stage: the upper mold 31 starts vacuum adsorption, and the forming mold 22 stops vacuum adsorption, and the wet blank is transferred from the forming surface of the forming mold 22 to the mold cavity molding surface of the upper mold 31. The servo electric cylinder 24 drives the forming mold 22 to descend back to the pulp box 21, and the translation servo motor 131 drives the upper mold 31 to return to the drying station of the hot pressing drying device 3 through the chain transmission. The positioning unit 35 pushes the positioning block 354 and the positioning clamp 311 of the upper mold 31 through the positioning cylinder 351 to achieve mechanical positioning to ensure that the upper mold 31 is accurately positioned.

[0104] Drying stage: the lifting servo motor 55 is started, and the ball-type transmission screw 53 is driven to rotate through the sprocket and chain transmission; the telescopic end of the auxiliary cylinder 6 extends synchronously to provide an initial thrust for the rise of the base 37, reducing the starting load of the lifting servo motor 55; the connecting rod assembly 38 drives the base 37 and the lower mold 32 to rise, driving the lower mold 32 and the upper mold 31 to close the mold for the second time to form a sealed mold cavity; the temperature sensor built into the heating plate 36 transmits real-time temperature data to the PLC control system of the controller. The system can control the drying temperature at 180-220℃ according to the preset drying process parameters, and automatically adjusts the power of the heating plate 36 through the PID algorithm; the lifting servo motor 55 accurately controls the clamping pressure and stroke through its own encoder to ensure a stable and efficient drying process.

[0105] Demolding stage: The lifting servo motor 55 reverses, and the base 37 drives the lower mold 32 to descend and reset. The robot reaches into the space between the upper mold 31 and the lower mold 32 through the negative pressure suction cup, grabs the dried product, and transfers it to the conveyor belt. The system enters the next cycle.

[0106] The technical features of the above embodiments may be arbitrarily combined. To simplify the description, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A pulp molding equipment integrating pulp molding and drying, characterized in that: It includes a frame assembly, a forming device is provided in the middle of the length direction of the frame assembly, and hot pressing and drying devices are provided on both symmetrical sides of the forming device; The forming device is provided with a pulp box and a vertically movable forming die. A microporous array is provided on the forming surface of the forming die. The forming die is connected to an external vacuum unit via an air pipe. The forming die descends into the pulp box filled with pulp, and water is extracted by negative pressure from the vacuum unit, so that the pulp fibers are evenly deposited on the forming surface of the forming die, forming wet-formed pulp. The hot pressing and drying device is provided with an upper mold that can be translated under the top frame of the frame assembly, a lower mold that can be vertically lifted and heated, and a positioning unit provided on the top frame of the frame assembly; one of the negative pressure branches of the vacuum unit is connected to the upper mold through an air pipe; the positioning unit is used to locate the clamping position of the upper mold and the lower mold; The positioning unit unlocks the upper mold and translates it into the forming device. The forming mold drives the wet forming pulp to rise to perform the initial mold closing with the upper mold. The vacuum unit restores the positive pressure of the forming mold and the negative pressure of the upper mold to absorb the wet forming pulp on the forming mold. The forming mold descends and opens with the upper mold. The upper mold translates and returns to above the lower mold and is positioned by the positioning unit. The lower mold starts heating and rises to perform the secondary mold closing with the upper mold. The wet forming pulp is hot-pressed by the upper mold and the lower mold to form a dry pulp product. The lower mold descends to open the mold closing surface with the upper mold, and a robot external to the frame assembly grabs the dry pulp product. The top frame of the frame assembly is provided with a translation unit, a slider of the translation unit is connected to the back of the upper mold, and a translation servo motor of the translation unit drives the upper mold to translate back and forth between the hot pressing and drying device and the forming device through a chain transmission; The forming device includes a lifting frame, a servo electric cylinder and the forming die arranged on the top frame of the frame assembly; In the vertical direction, a plurality of first guide columns are provided on the lower bottom surface of the jacking frame, and a plurality of first linear bearings corresponding to the positions of the first guide columns are provided on the top frame of the frame assembly, and the plurality of first guide columns are respectively slidably connected to the plurality of first linear bearings; The first guide post extends into the frame assembly and is connected to the forming die; The base of the servo electric cylinder is fixedly connected to the top frame of the frame assembly, and the telescopic end of the servo electric cylinder is connected to the inner top surface of the lifting frame. The servo electric cylinder drives the lifting frame to rise or fall, and the lifting frame drives the forming mold to rise or fall in the pulp box, and drives the forming mold to close or open the upper mold.

2. The pulp molding equipment according to claim 1, characterized in that A first negative pressure cavity is provided between the molding surface and the back surface of the molding die, and a first negative pressure interface is provided on the side surface of the molding die to connect with the first negative pressure cavity and the vacuum unit.

3. The pulp molding equipment according to claim 1, characterized in that A suction hole array is provided on the molding surfaces of the upper mold and the lower mold, and a second negative pressure cavity is provided between the molding surfaces and the back surfaces of the upper mold and the lower mold. The second negative pressure cavity is connected to the vacuum unit through an air pipe.

4. The pulp molding equipment according to claim 1, characterized in that Positioning clamps are provided on two opposite sides of the upper mold, and one positioning unit is arranged on each of the two opposite sides of the upper mold; The positioning unit includes a positioning cylinder, a positioning slide rail, a positioning slider and a positioning block; The positioning cylinder and the positioning slide rail are sequentially installed from top to bottom in the grooves of the top frame of the frame assembly corresponding to the side of the upper mold; The mounting portion of the positioning block is connected to the positioning slider, the positioning slider is slidably connected to the positioning rail, and the telescopic end of the positioning cylinder is connected to the mounting portion of the positioning block; During positioning, the telescopic end of the positioning cylinder drives the positioning block to slide downward, and the positioning portion of the positioning block abuts against the positioning clamp to position the upper mold and cooperate with the translation unit to interlock the position of the upper mold.

5. The pulp molding equipment according to claim 1, characterized in that A heating plate, a base, a connecting rod assembly and a pedestal are sequentially arranged under the lower mold; The heating plate is equipped with a temperature sensor for real-time monitoring of the temperature of the heating plate to control the temperature of the dried pulp. The two ends of the connecting rod assembly are respectively connected to the base and the pedestal, and are used to provide travel limits for the lifting and lowering of the base; The base is arranged on the bottom frame of the frame assembly; linear guide sleeves are provided at mutually corresponding positions of the edges of the base and the edges of the base, and a second guide column is slidably sleeved in the linear guide sleeve, and the two ends of the second guide column are respectively connected to the top frame and the bottom frame of the frame assembly, for providing guidance for the lifting and lowering of the base; A lifting unit is installed on the base, and a transmission block of the lifting unit is connected to the connecting rod assembly and drives the lower mold to move up and down.

6. The pulp molding equipment according to claim 5, characterized in that The connecting rod assembly includes a first connecting rod, a second connecting rod and a third connecting rod; One end of the first connecting rod is rotatably connected to the rotating seat on the base, the other end of the first connecting rod is connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting ear of the base; One end of the third connecting rod is rotatably connected to the connecting ear of the first connecting rod, and the other end is rotatably connected to the connecting ear of the transmission block.

7. The pulp molding equipment according to claim 6, characterized in that The lifting unit includes the transmission block, the guide frame, the transmission screw, the transmission nut and the lifting servo motor; The guide frame is mounted on the base and placed at the center of the base, third guide posts are mounted on both sides of the guide frame, and the transmission screw is arranged between the two third guide posts; The lifting servo motor is arranged on one side of the base, and the rotating end of the lifting servo motor extends out of the bottom of the base in the vertical direction; The two ends of the transmission screw are rotatably connected to the top of the guide frame and the base respectively, and one end of the transmission screw passes through the base to extend to the bottom and is connected to the rotating end of the lifting servo motor through a sprocket and a chain transmission; The transmission nut is mounted on the transmission block; The transmission block is arranged in the guide frame, is slidably connected to the third guide column, and is transmission-connected to the transmission screw through the transmission nut; An auxiliary cylinder is provided on the base frame of the frame assembly, and the telescopic end of the auxiliary cylinder extends out and abuts against the bottom of the base before the lower mold is raised, so as to reduce the driving load of the lifting servo motor.

8. The pulp molding equipment according to claim 7, characterized in that A mold adjustment motor is also installed on the base; The linear guide sleeve on the base is covered with a T-shaped threaded rod to form a T-shaped threaded guide rod, and the T-shaped threaded guide rod is externally connected to a transmission threaded sleeve, and the transmission threaded sleeve is fixedly connected to the base; One end of the plurality of T-shaped threaded rods is located on the base and is transmission-connected to the rotating end of the mold adjustment motor through a sprocket and a transmission chain; The other ends of the plurality of T-shaped threaded rods are located below the base and are rotatably connected to the bottom frame of the frame assembly; The mold adjustment motor drives the T-shaped threaded rod to rotate, driving the base connected to the transmission threaded sleeve to rise and fall, so as to adjust the overall starting height of the base, the base and the lower mold, thereby improving the adaptability of the lower mold size type.

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