Low-water-content paper pulp molding injection molding device

Abstract

The invention discloses a low-water-content paper pulp molding injection molding device which comprises a material extruding mechanism, a material injection mechanism and a mold closing mechanism, the mold closing mechanism comprises a mold with a heater and a mold cavity and a sprue bush arranged on the mold and connected with the mold cavity, and heat insulation plates are arranged on the two outer sides of a paper pulp runner mold connecting the sprue bush and the material injection mechanism respectively. A cold runner plate filled with cooling water is further arranged on the outer side of the heat insulation plate, one end of the paper pulp runner is arranged in the cold runner plate in a penetrating mode and connected with the sprue bush, a valve needle driven by a piston is further arranged in the paper pulp runner, and the paper pulp runner can be communicated with the sprue bush and the mold cavity by retreating the valve needle backwards from the paper pulp runner. And the valve needle can be forwards used for closing the paper pulp runner and pushing the pulp in the sprue bush into the mold cavity. According to the device, paper pulp in the paper pulp runner is not influenced by high temperature before entering a mold, curing caused by heating is avoided, and a product is molded without a pouring gate.

Description

Technical Field

[0001] The present invention belongs to pulp molding, and particularly relates to a low-moisture pulp molding injection molding device. Background Art

[0002] Pulp molding is a three-dimensional papermaking technology that uses pulp board or waste paper as raw materials. The existing process mainly adopts wet molding to make slurry, which is adsorbed by a mold, trimmed, and dried and shaped on a molding machine to manufacture paper products of a certain shape. Its advantages are: the raw materials are pulp board or waste paper, including cardboard, waste carton paper, waste white edge paper, etc., and the sources are extensive. Its production process is harmless to the environment and can be recycled. In addition to making lunch boxes and tableware, pulp molding can also be used to make packaging boxes, trays and other industrial cushioning packages, and has been widely used. However, for existing wet pulp molding machines, due to the low specific gravity of fibers in the slurry, pulp and water waste are likely to occur during the processes of suction, pressure filtration, and trimming, resulting in low work efficiency, high energy consumption, rough surfaces, and inability to perform graphic printing.

[0003] A semi-dry pulp process with the patent publication number CN 114932717 A discloses a process method that uses semi-dry pulp, whose main components are starch glue, paper fibers, PVA and other additives, and a small amount of water. Using this low-moisture pulp material for molding does not require suction filtration or trimming, reduces water / fiber waste and energy consumption, and can also incorporate processes such as in-mold labeling in the injection molding industry to solve the problem of graphic printing on pulp molding packaging products. In addition, a method for producing packaging products with all-dry pulp with the patent publication number CN 115852747 A also states that no water is required, and its main components are dry pulp, starch, PVA and other additives, having the effects of energy saving and water saving. For the above two patents, the former suggests putting the pulp dough into a high-temperature mold for extrusion, foaming and curing. The latter suggests heating the pulp premix to 60-200°C and then injecting it into the mold cavity under high pressure for molding. Tests on the hot pressing molding technology show that the pulp hot pressing and foaming molding method can produce packaging products such as boxes, bowls, and cup holders with a certain wall thickness and small flow length ratio, but cannot mold products with a large flow length ratio (exceeding 100), thin walls or slender skeleton types, and the quality of the products is prone to unevenness. In addition, tests on injecting the slurry into the mold cavity under high pressure using ordinary injection molding machines and molds show that it is very difficult to store the slurry from the hopper to the injection screw. Since the slurry is in a doughy state, it will not flow automatically in the hopper, and additives such as starch glue and PVA in the slurry are likely to adhere to the barrel wall and the mold runner, and are easy to solidify and difficult to clean; there are gate marks on the products, and the slurry in the nozzle is easy to solidify and block the nozzle, etc., resulting in it being actually very difficult to produce in batches. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a low-water-content pulp molding injection molding device, which can prevent the pulp in the pulp flow channel from being affected by high temperature before entering the mold and avoid curing due to heat.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A low-water-content pulp molding injection molding device includes a material extrusion mechanism, a material injection mechanism, and a mold clamping mechanism. The material extrusion mechanism is connected to the material injection mechanism for extruding pulp into the material injection mechanism; the material injection mechanism is connected to the mold clamping mechanism for injecting the pulp into the mold cavity of the mold clamping mechanism. The mold clamping mechanism includes a mold with a heater and a mold cavity, a sprue bushing provided on the mold and connected to the mold cavity, and a pulp flow channel connecting the sprue bushing and the material injection mechanism. Heat insulation plates are respectively provided on the two outer sides of the mold. A cold runner plate with internal cooling water is further provided on the outer side of one heat insulation plate. One end of the pulp flow channel penetrates into one cold runner plate and is connected to the sprue bushing, and a valve needle driven by a piston is further provided in the pulp flow channel. By withdrawing the valve needle backward from the pulp flow channel, the pulp flow channel can be communicated with the sprue bushing and the mold cavity, and by pushing the valve needle forward, the pulp flow channel can be closed and the slurry in the sprue bushing can be pushed into the mold cavity.

[0007] The mold clamping mechanism has at least one mold cavity, and each mold cavity has a sprue bushing. One end of the sprue bushing is further connected with a guide sleeve. The pulp flow channel includes a main runner pipe and a sub-runner pipe. One end of the main runner pipe is respectively connected to each guide sleeve through the sub-runner pipe. The number of valve needles matches the number of mold cavities, and the valve needles can penetrate into the sprue bushing through the guide sleeves.

[0008] The material injection mechanism includes a barrel, an injection screw, an injection screw driving device, an injection moving support, and an injection table tie rod assembly. A feeding port is provided on the barrel, and a nozzle capable of abutting against and communicating with the pulp flow channel is provided at the front end. The inner cavity at the rear end of the nozzle is conical; the injection screw penetrates into the barrel, and a stop boss and a conical screw head matching the nozzle are sequentially provided at the front end. A discharge groove hole is provided on the screw head, and a check ring is further sleeved on the injection screw between the screw head and the stop boss. There is a radial gap between the inner hole of the check ring and the injection screw and it is communicated with the discharge groove hole to form a material storage channel, and the check ring can move between the screw head and the boss; the injection moving support has a slide rail, the barrel is slidably arranged on the injection moving support through a barrel support, and is connected to the mold clamping mechanism through the injection table tie rod assembly; the injection screw driving device is slidably arranged on the injection moving support and is used to drive the injection screw to rotate and move forward and backward.

[0009] The front end of the check ring is provided with a first convex block that is stuck with the discharge groove hole and can rotate with the injection screw, and the front end of the check ring is further provided with a second convex block that abuts against the rear end of the screw head to form an axial gap between the two.

[0010] The discharge port is a waist-shaped hole with a width not less than the diameter of the injection screw and a length not less than twice the diameter of the injection screw.

[0011] The injection screw is designed to be divided into a feeding section, an extrusion section and a homogenizing section, and the screw groove depth changes gradually from 50% to 15% of the screw outer diameter from the back to the front.

[0012] The extrusion mechanism comprises a hopper vertically arranged on a feed outlet, an extrusion screw arranged in the hopper, a spiral belt arranged on the extrusion screw, and an extrusion screw driving device connected to the extrusion screw.

[0013] The main flow channel pipe and the branch flow channel pipe are both through structures, and their open ends are sealed with screw plugging rods.

[0014] The heat insulation board is made of ceramic material or high temperature resistant bakelite material.

[0015] The low-water pulp molding injection molding device of the present invention has the following advantages:

[0016] 1. The mold clamping mechanism is equipped with a heat insulation plate and a cold runner plate, which can protect the pulp in the pulp flow channel from the influence of high temperature before entering the mold, thus avoiding solidification due to heat;

[0017] 2. The valve needle is driven by the piston to control the conduction and closing of the pulp flow channel, and the material is injected into the mold cavity in conjunction with the injection screw. The valve needle is pushed into the gate sleeve through the guide sleeve, and the pulp in the gate sleeve can be pushed into the mold cavity, closing the gate while making the product without gate molding.

[0018] 3. The check ring is mounted on the screw head through a sleeve, and cooperates with the screw head and the shooting screw and rotates synchronously. When the shooting screw rotates, the pulp in the barrel can be pushed forward, and the pulp pushes the check ring to move forward. The axial gap between the check ring and the stop boss is opened, and the pulp passes through the radial gap between the check ring and the screw and the axial gap between the check ring and the screw head to the discharge slot hole of the screw head, and then enters the main channel pipe through the discharge slot hole to realize the opening of the storage channel during storage; and when the shooting screw moves forward to shoot, the check ring moves backward and contacts the stop boss to close the axial gap, thereby realizing the closure of the storage channel during injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 It is a schematic structural diagram of a low-water pulp molding injection molding device of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the mold clamping mechanism of the present invention;

[0022] Figure 3It is a schematic cross-sectional view of the pulp flow channel and the valve needle of the present invention;

[0023] Figure 4 It is a schematic structural view of the injection mechanism of the present invention;

[0024] Figure 5 It is a schematic structural view of the injection screw of the present invention;

[0025] Figure 6 and Figure 7 are respectively schematic views of different perspectives of the screw head and the check ring of the present invention;

[0026] Figure 8 It is a process flow block diagram of the pulp molding injection molding of the present invention. Specific embodiments

[0027] A low-water-content pulp molding injection molding device of the present invention is as Figure 1 described, mainly including an extrusion mechanism 1, an injection mechanism 2, and a mold clamping mechanism 3. The extrusion mechanism 1 is connected to the injection mechanism 2 for extruding pulp into the injection mechanism 2; the injection mechanism 2 is connected to the mold clamping mechanism 3 and they are both arranged on the frame 101. The injection mechanism 2 is used to inject pulp into the mold cavity of the mold clamping mechanism 3.

[0028] As Figure 2 and Figure 3 shown, the mold clamping mechanism 3 mainly includes a mold having heaters 204, 208 (which can be resistance, microwave or electromagnetic heating, etc.) and a mold cavity, a sprue bushing 209 arranged on the mold and connected to the mold cavity, and a pulp flow channel connecting the sprue bushing 209 and the injection mechanism 2. Front and rear heat insulation plates 210 and 202 are respectively arranged on the two outer sides of the mold. The heat insulation plates can be made of ceramic materials or high-temperature bakelite materials. A cold runner plate 211 with internal cooling water is also arranged on the outer side of the front heat insulation plate 210. One end of the pulp flow channel penetrates into the cold runner plate 211 and is connected to the sprue bushing 209, and a valve needle 214 driven by a piston 215 is also arranged in the pulp flow channel. By the valve needle 214 retracting backward from the pulp flow channel, the pulp flow channel can be communicated with the sprue bushing 209 and the mold cavity, and by the valve needle 214 moving forward, the pulp flow channel can be closed and the pulp material in the sprue bushing 209 can be pushed into the mold cavity.

[0029] The mold specifically includes front and rear templates 207, 203, which have at least one mold cavity, Figure 2 and there are two independent upper and lower mold cavities. Each mold cavity has a sprue bushing 209, and one end of the sprue bushing 209 is also connected with a guide sleeve 212. The pulp flow channel includes a main runner tube 218 and a sub-runner tube 221. One end of the main runner tube 218 is respectively connected to each guide sleeve 212 through two sub-runner tubes 221. The number of valve needles 214 matches the number of mold cavities, and the corresponding valve needles 214 can penetrate into the sprue bushing 209 through the guide sleeves 212.Figure 2-3 It has a pair of upper and lower hydraulic or pneumatic cylinders. A flow path turning hole 224 communicating with the shunt channel pipe 221 and the guide sleeve 212 is provided on the cylinder head 213. The cylinder head 213 is connected to the front mold bottom plate 217 by a cylinder barrel 216. A piston 215 is installed in the cylinder barrel 216, and a valve needle 214 is installed on the piston 215. The valve needle 214 passes through the cylinder head 213 and is concentric with the guide sleeve 212 and the sprue bushing 209. Before injection and during injection, the piston 215 retracts to the end, and the valve needle 214 retracts into the cylinder head 213. The main runner pipe 218 is communicated with the mold cavity through the shunt channel pipe 221, the flow path turning hole of the cylinder head 213, the guide sleeve 212, and the sprue bushing 209, so that the pulp can be smoothly injected into the mold cavity; after the injection is completed, the piston 215 advances, the valve needle 214 passes through the guide sleeve 212, extends into the sprue bushing 209 and is flush with the surface of the mold cavity, and the slurry in the sprue bushing 209 is pushed into the mold cavity to complete the filling of the mold cavity, close the gate, and form the product without a gate. The function of the needle valve 214 closing the sprue bushing 209 is to isolate the slurry in the mold cavity from the slurry in the pulp flow path. When the slurry in the mold cavity is heated and solidified, the slurry in the pulp flow path is kept at a lower temperature to maintain the flow characteristics of the pulp.

[0030] Both the main runner pipe 218 and the shunt channel pipe 221 adopt a through structure, and the open ends of the two are blocked by a first plug 220 and a second plug 219 respectively. These plugs can be disassembled from the outside of the mold, so that the residual material in the flow path can be removed and the mold can be maintained without removing the mold.

[0031] A large-area water tank 222 is opened on the cold runner plate 211 to surround the shunt channel pipe 221. By cooperating with an external mold temperature controller, the mold temperature can be isolated from the outside during operation, and accurate temperature control of the shunt channel pipe 221 outside the cold runner plate 211 can be achieved to avoid the solidification of the stored material in the pipe.

[0032] Generally, guide posts, guide sleeve positioning, etc. are provided between the front and rear templates 207 and 203; an ejection mechanism can be set inside the rear template 203 to facilitate the removal of the product after mold opening; for larger or multi-(group) cavity molds, an integral mold base is used for installation and support, etc., which is prior art and will not be elaborated here.

[0033] The rear heat insulation plate 202 isolates the high-temperature rear template 203 from the normal-temperature installation base plate 201 to reduce energy consumption and protect the machine. The installation base plate 201 and the front mold bottom plate 217 are respectively installed on the two moving plates 223 of the mold clamping mechanism 3. The moving plates 223 are connected to the opening and closing drive mechanism 5 of the mold clamping mechanism 3, and the mold is driven by the opening and closing drive mechanism 5 to open and close integrally to meet the needs of injection filling and product removal.

[0034] Such as Figures 4-7As shown in the figure, the material injection mechanism 2 includes a barrel 102, an injection screw 103, an injection screw driving device 115, an injection moving support 116, and an injection table tie rod assembly 118. A barrel temperature control device 109 is installed outside the barrel 102. As a general technology, it generally includes a heater, a thermocouple, a cooling ring, a PID temperature controller, a solenoid valve, etc., and will not be described in more detail here. The barrel 102 is provided with a feeding port 119 and a nozzle 104 at the front end that can abut against and communicate with the pulp flow channel. The rear end of the nozzle 104 is a conical inner cavity. The injection screw 103 is horizontally disposed inside the barrel 102. A stop boss 120 and a conical screw head 105 matching the nozzle 104 are sequentially provided at the front end from back to front. The screw head 105 is provided with an axial discharge slot hole 121. A check ring 106 (loose fit) is also sleeved on the injection screw 103 between the screw head 105 and the stop boss 120. There is a radial gap 122 between the inner hole of the check ring 106 and the injection screw 103 at the corresponding position. The check ring 106 can move relatively between the screw head 105 and the boss 120, and respectively form a front axial gap between the front end face of the check ring 106 and the rear end face of the screw head 105, and a rear axial gap between the rear end face of the check ring 106 and the front end face of the stop boss 120. The communication of the above-mentioned radial gap, front and rear axial gaps, and the discharge slot hole 121 constitutes a storage channel. The injection moving support 116 has a slide rail. The barrel 102 is slidably disposed on the injection moving support 116 through a barrel support 117 and is connected to the clamping mechanism 3 through the injection table tie rod assembly 118. The barrel 102 is pulled forward by the injection table tie rod assembly 118 so that the nozzle 104 abuts tightly against and communicates with the inlet of the main runner pipe 218 of the clamping mechanism 3. Similarly, the barrel 102 can also be pulled backward so that the clamping mechanism 3 is separated from the injection screw 103. The driving device 115 is also slidably disposed on the injection moving support 116 and is used to drive the injection screw 103 to rotate and move forward and backward.

[0035] At the front end of the check ring 106, there is also a first convex block 123 that is engaged with the discharge chute hole 121 and can rotate together with the injection screw 103. The discharge chute hole 121 is relatively deep, and there is a space between the bottom of the first convex block 123 and the bottom of the discharge chute hole 121. When storing materials, the check ring 106 is connected to the screw head 105 and rotates together to prevent wear between the front end face of the check ring 106 and the screw head 105, and can also avoid slurry deposition between the check ring 106 and the inner wall of the barrel 102 (if the check ring 106 does not rotate, there is no relative movement between the inner wall of the barrel 102 and the check ring 106, and the slurry there will deposit), and realize the control of the material storage channel. That is, when storing materials, when the injection screw 103 rotates, it can push the pulp in the barrel 102 forward. The pulp pushes the check ring 106 forward, and the rear axial clearance between the rear end face of the check ring 106 and the front end face of the stop boss 120 is opened. The pulp enters the main runner tube 218 through the material storage channel (that is, through the rear axial clearance, radial clearance, front axial clearance and the discharge chute hole 121 of the screw head 105). At the same time, due to the reaction of material storage, the injection screw 103 rotates in the reverse spiral direction and retreats when storing materials. When injecting materials, the injection screw 103 stops rotating and changes to a fast linear movement forward, pushing the conical screw head 105 to make the pulp pass through the nozzle 104, main runner tube 218, sub-runner tube 221, sprue bushing 209 in sequence, and finally enter the mold cavity 207, that is, realize the injection of pulp. During this process, the stop boss 120 of the injection screw 103 will first abut against the check ring 106, and the axial clearance there is closed, thus closing the material storage channel and no longer storing materials. By repeating the above actions, a continuous material storage and injection process can be realized.

[0036] The axial length of the first convex block 123 is greater than the axial stroke of the check ring 106, that is, when the first convex block 123 moves forward and backward with the check ring 106, the first convex block 123 can always be engaged with the discharge chute hole 121. At the front end of the check ring 106, there is also a second convex block 124 that abuts against the rear end of the screw head 105. This structure always ensures an axial clearance between the screw head 105 and the check ring 106 when the check ring 106 and the screw head 105 are engaged and rotate synchronously, so that the material storage channel is unobstructed. [[ID=##]]

[0037] Such as Figure 5As shown, the groove depth of the injection screw 103 gradually changes from 50% of the screw outer diameter to 15% from the rear to the front, and is designed as a feeding section, an extrusion section, and a homogenization section. Since the low-moisture pulp is in a dough-like state and not easy to flow, an appropriate groove depth in the feeding section can generate efficient transportation. When the pulp from the hopper of the forced extrusion fills into the barrel 102 and the injection screw 103 rotates, an axial thrust forward is generated on the inclined surface of the spiral teeth. This thrust gradually increases towards the direction of the screw head 105. When reaching the extrusion section, it is compressed due to the gradually decreasing groove depth, and the pressure superimposition gradually increases, which creates conditions for the pulp to stably pass through the narrow gap of the check ring 106. In the homogenization section, the pulp is rubbed and sheared by the inner wall of the barrel 102 and the bottom surface of the screw groove, generating a good mixing effect, making the pulp texture uniform, which is beneficial to the quality and stability of the product.

[0038] The feeding port 119 is a kidney-shaped hole with a width not less than the diameter of the injection screw 103 and a length L not less than twice the diameter of the injection screw 103. This can greatly increase the pulp initially entering the groove in the feeding section of the injection screw 103, increase the internal pressure in the feeding section, and can store materials smoothly.

[0039] Please refer to Figure 4 As shown, the extrusion mechanism 1 includes a hopper 114 vertically arranged on the feeding port 119, an extrusion screw 112 arranged in the hopper 114, a spiral ribbon 113 arranged on the extrusion screw 112, and an extrusion screw driving device 110 connected to the extrusion screw 112 through a bearing seat 111 and vertically installed at the upper end of the hopper 114. The spiral ribbon 113 is a variable-diameter spiral line, and its outer shape matches the inner cavity of the hopper 114. The extrusion screw driving device 110 drives the extrusion screw 112 and the spiral ribbon 113 fixed on it to rotate in the reverse spiral direction, continuously stirs the pulp in the hopper 114 and aggregates it towards the middle and downwards, and feeds the pulp downwards by the extrusion screw 112.

[0040] The low-moisture pulp molding injection device further includes a control system 4 for controlling the actions of mold opening and closing, extrusion and injection, and the corresponding temperature.

[0041] The molding process using the low-moisture pulp molding injection device of the present invention is as follows:

[0042] As Figure 8As shown, the raw material used is a low-moisture pulp mixture, which is in a dough-like state and weighs from several hundred grams to several kilograms. Process: The pulp dough is crushed and mixed by the spiral ribbon 113 → the dough is extruded into the barrel 102 by the feeding screw 112 → the injection screw 103 rotates for material storage (at this time, the valve needle 214 is closed, and the pulp material in the pulp flow channel is isolated from the mold cavity 207) → a label is placed in the mold (the label can be not pasted according to the requirements of the product) → the mold is closed → at this time, the valve needle 214 retracts, and injection filling is carried out forward through the injection screw 103, and then the pulp material in the sprue bushing 209 is pushed into the mold cavity by the closing of the valve needle 214 → heating and curing → the mold is opened to take out the product, and the next working cycle is carried out. The pulp is pre-set at 20 - 90 °C in the barrel 102; the injection pressure is generally 100 - 200 MPa high pressure. This process can make the mold cavity filled completely and tightly, and can produce precise thin-walled and complex products.

[0043] Compared with the prior art, the present invention realizes low-moisture pulp injection molding, and has the advantages of water saving, paper pulp raw material saving, energy consumption reduction, and can produce complex, smooth-surface and precise-size products. Moreover, it is convenient to maintain, expands the application range of pulp molding, and is easy to realize mass production.

[0044] However, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as within the scope of the substantial spirit of the present invention, the changes and modifications to the above-described embodiments will fall within the scope of the claims of the present invention.

Claims

1. A low-water-content pulp molding injection molding device, comprising a material extrusion mechanism, a material injection mechanism, and a mold clamping mechanism. The material extrusion mechanism is connected to the material injection mechanism for extruding pulp into the material injection mechanism; the material injection mechanism is connected to the mold clamping mechanism for injecting the pulp into the mold cavity of the mold clamping mechanism. The mold clamping mechanism includes a mold having a heater and a mold cavity, a sprue bushing provided on the mold and connected to the mold cavity, and a pulp runner connecting the sprue bushing and the material injection mechanism, characterized in that: Heat insulation plates are respectively arranged on two outer sides of the mold. A cold runner plate with internal cooling water passage is further arranged on the outer side of one heat insulation plate. One end of the pulp runner penetrates into one cold runner plate and is connected to the sprue bushing. A valve pin driven by a piston is further arranged in the pulp runner. By retracting the valve pin backward from the pulp runner, the pulp runner can be communicated with the sprue bushing and the mold cavity. By pushing the valve pin forward, the pulp runner can be closed and the slurry in the sprue bushing can be pushed into the mold cavity.

2. The low water content pulp molding injection molding device according to claim 1, wherein: The mold clamping mechanism has at least one mold cavity. Each mold cavity has a sprue bushing. A guide sleeve is further connected to one end of the sprue bushing. The pulp runner includes a main runner pipe and a sub-runner pipe. One end of the main runner pipe is respectively connected to each guide sleeve through the sub-runner pipe. The number of valve pins matches the number of mold cavities. The valve pins can penetrate into the sprue bushings through the guide sleeves.

3. The low-water-content pulp molding injection molding device according to claim 1, characterized in that: The injection mechanism includes a barrel, an injection screw, an injection screw driving device, an injection moving support, and an injection table tie rod assembly. A feeding port is arranged on the barrel. A nozzle capable of abutting against and communicating with the pulp runner is arranged at the front end. The inner cavity at the rear end of the nozzle is conical. The injection screw penetrates into the barrel. A stop boss and a conical screw head matching the nozzle are successively arranged at the front end. A discharge groove hole is arranged on the screw head. A check ring is further sleeved on the injection screw between the screw head and the stop boss. A radial gap is formed between the inner hole of the check ring and the injection screw and is communicated with the discharge groove hole to form a material storage channel. The check ring can move between the screw head and the boss. The injection moving support has a slide rail. The barrel is slidably arranged on the injection moving support through a barrel support and is connected to the mold clamping mechanism through the injection table tie rod assembly. The injection screw driving device is slidably arranged on the injection moving support and is used to drive the injection screw to rotate and move forward and backward.

4. The low water content pulp molding injection molding device according to claim 3, characterized in that: A first convex block that is stuck with the discharge groove hole and can rotate together with the injection screw is arranged at the front end of the check ring. A second convex block that abuts against the rear end of the screw head to form an axial gap between the two is further arranged at the front end of the check ring.

5. The low water content pulp molding injection molding device according to claim 3, characterized in that: The feeding port is a kidney-shaped hole with a width not less than the diameter of the injection screw and a length not less than twice the diameter of the injection screw.

6. The low water content pulp molding injection molding device according to claim 3, wherein: The injection screw is designed with a feeding section, an extrusion section, and a homogenization section. The depth of the screw groove gradually changes from 50% of the outer diameter of the screw to 15% from the rear to the front.

7. The low water content pulp molding injection molding device according to claim 3, characterized in that: The material extrusion mechanism includes a hopper vertically arranged above the feeding port, an extrusion screw arranged in the hopper, a spiral ribbon arranged on the extrusion screw, and an extrusion screw driving device connected to the extrusion screw.

8. The low-water-content pulp molding injection molding device according to claim 2, wherein: Both the main runner pipe and the sub-runner pipe are through structures, and their open ends are sealed with screw plugs.

9. The low water content pulp molding injection molding device according to claim 1, characterized in that: The heat insulation plates are made of ceramic materials or high-temperature bakelite materials.

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