CN211171432U - Paper pulp molding equipment with spring ball type mold lifting device - Google Patents
Paper pulp molding equipment with spring ball type mold lifting device Download PDFInfo
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- CN211171432U CN211171432U CN201921492792.3U CN201921492792U CN211171432U CN 211171432 U CN211171432 U CN 211171432U CN 201921492792 U CN201921492792 U CN 201921492792U CN 211171432 U CN211171432 U CN 211171432U
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Abstract
The utility model discloses a paper pulp molding equipment with mould device is lifted to spring ball formula, including quick detach formula gyro wheel arm and spring ball device. The utility model discloses a quick retooling of paper pulp molding product former, the mould of use can accurate accuse temperature, and temperature deviation control is within +/-2 ℃, reduces the energy consumption, and the intensification time control is within 10min to improve production efficiency and machine rate of utilization.
Description
Technical Field
The utility model relates to a paper pulp molding technical field, concretely relates to paper pulp molding equipment with mould device is lifted to spring ball formula and operation method thereof.
Background
Along with the increasing market competition, industrial products are updated more and more quickly, coexisting varieties are more and more, the conditions of multi-variety, medium and small batch and mixed flow just-in-time production in production become mainstream, therefore, the interval time of mold replacement is shorter and shorter, namely, the frequency of mold replacement is higher and higher, the downtime of a corresponding matched machine table is greatly increased, the production efficiency and the machine utilization rate are seriously influenced, and the delivery cycle is prolonged. If the problem of rapid die and line changing cannot be effectively solved in automatic production, the automation degree of other links is high, the utilization rate of equipment is difficult to be fully improved, the production efficiency is difficult to be improved, and the problem has a perfect solution, namely: a fast mold change System (SMED) was used, Single Minute Exchange of die, a 50 s origin in Japan, developed by Shigeo Shingo in Toyota, with Single meaning less than 10 Minutes (Minutes). Originally used in automotive manufacturers to achieve fast switching (Exchange of Dies), it helped the Toyota enterprise product switching time to be reduced from 4 hours to 3 minutes. As the name implies, the purpose is to shorten the job transition time, and the key point is to define the internal job transition and the external job transition, change the internal job transition into the external job transition as much as possible, and then shorten the internal and external job transition time as much as possible.
In the field of pulp moulding, rapid mould changes are also required in order to achieve factory automation. At present, the forming machine mainly has two types of structures, namely a reciprocating type and a turnover type, and as for a turnover type forming machine (the technical application related to the patent is based on a turnover type structure for expansion analysis), the forming machine is developed to a fourth generation machine (a working table surface size 1260 x 960) by a first generation prototype machine (a working table size 960 x 550) through continuous improvement, the machine table is also expanded by the original simple structure, the function is single, the structure is reasonable, the multifunctional direction is transited, but a certain distance exists from full-automatic production, such as: the upper die and the lower die of the die need manual operation, the die needs manual carrying when moving, the auxiliary equipment is limited to manual lifting equipment, and the time and labor consumption during the process become a part of the production and operation cost. The utility model aims at providing a mould device is lifted to spring ball formula to add institutional advancement on the basis of the former of current paper pulp moulding product, with the function of realization quick die change.
In addition, the main heat source transferring modes of the conventional paper-plastic hot-press forming station comprise two modes: the first is high temperature heat conducting oil which conducts heat to the die through an oil path of the workbench, and the second is 12 or 24 resistance wire heating rods which are distributed on the side of the workbench to heat the die. The traditional heating mode, wherein the temperature comes from the machine table side, is heated by the heat conducting element and then transferred to the pulp molding machine mold, has several significant defects in heat exchange: 1. the loss in the heat conduction process is serious, the energy consumption is large, and the energy waste directly causes the increase of the factory cost; 2. the deviation value is large in the energy exchange process, and the heating is not uniform (the deviation is up to more than 10 ℃ after verification), so that the product is heated to different degrees due to different temperatures, has different shrinkage rates, and has more wrinkles, fractures and deformations and lower yield; 3. the mold has long heating time and even can not reach the process temperature, thus seriously affecting the production efficiency and the machine utilization rate.
In summary, the transition from traditional manufacturing to a lean time-based approach is one of the objectives of this patent, achieving flexible production, low in-process inventory, and shorter remodeling times to achieve the end goal of rapid response to changes in customer demand.
SUMMERY OF THE UTILITY MODEL
To the not enough of existing among the above-mentioned prior art, the utility model provides a transformation and optimization of former based on current paper pulp molding product realizes paper pulp molding product former's quick die change, and the mould of use can accurate accuse temperature, and temperature deviation control is within +/-2 degrees centigrade, reduces the energy consumption, and the intensification time control is within 10min to improve production efficiency and machine rate of utilization.
In order to achieve the above purpose, the present invention is realized by the following technical solution:
a spring ball type mold lifting device of pulp molding equipment comprises a quick-release roller arm and a spring ball device.
The quick-release type roller arm is arranged on one side of the workbench and is connected with the workbench through a roller arm fixing block. And a sliding roller is attached in the quick-release type roller arm.
The wheel arm fixing block is used for fixing and quickly disassembling the wheel arm, the wheel arm is hung on the wheel arm fixing block through a lever principle (a cylindrical pin on the wheel arm clamps a groove of the fixing block by self gravity), and the wheel arm can be easily taken down by applying force in the opposite direction (upwards) when taken down.
The spring ball device is arranged on the workbench and is used for supporting the ball on the spring. Spring specifications can be designed to various specifications according to the actual production mold weight. The spring ball devices are arranged in a matrix to enable the die to be stressed uniformly as a whole when sliding. The mold lifting device is connected to the molding machine through the control module.
A plurality of sets of ball devices are designed on the design surface of the workbench according to the actual size of the workbench and the actual size of the die of the existing forming machine, so that the die can be integrally stressed uniformly when sliding. The bearing capacity of a single ball spring is 15-20 kgf (the spring force can be designed and adjusted), the mold lifting force with the theoretical value of 960-1280 kgf can be provided, meanwhile, the maximum floating design distance of the balls is 3mm, and the sliding space of the mold is fully guaranteed. The mould is locked by a hydraulic locking device, and the locking state is sensed by a pressure sensor.
The specific operation steps are as follows:
a. and (3) upper die operation: the ball is in a floating state under the action of spring force, the mold moves from a mold position A on the quick-release roller arm to a mold position B on the workbench, and after the mold moves in place, the mold slowly descends under the action of locking force of the mold locker until the mold is attached to the workbench, so that the upper mold of the mold is completed;
b. and (3) lower die operation: and (4) loosening the mold locker, floating the ball upwards under the action of spring force, and moving the mold from the mold position B on the workbench to the mold position A on the quick-release type roller arm to finish the lower mold action of the mold.
The mold locker can be a hydraulic mold locker, and a pressure sensor is further arranged to sense the locking state of the mold.
The control module in the device not only feeds back signals, but also has an error signal correction function, and can timely interfere system error operation under the condition that an operator operates the device by mistake.
The manual auxiliary operation is cooperated, and meanwhile, the hydraulic mold locking device is matched, so that the time for loading and unloading the mold once by the forming mold of the device can be controlled within 15 minutes.
After the mold locking action is completely finished, the mold is fixed on the machine table, the temperature control box is started, and the mold heating ring in the mold is controlled to start heating until the set temperature is reached.
The mold comprises a mold heating ring and a temperature control device, wherein the mold heating ring is arranged in a groove around the mold cavity and/or the mold core.
The temperature control device is connected with the mold heating ring, is arranged on one side of the machine table and has the functions of temperature setting and monitoring. The forming machine controls the heating temperature of the workbench through the temperature control element, and the mold heating ring is integrated on the inner side of the forming machine through line group connection.
The basic structure of the heating ring of the die is a heating pipe, and the specific structure is the prior art, such as: the metal tube is provided with an electrothermal element and is led out by a lead-out rod, the gap part is tightly filled with crystallized magnesia powder with good heat resistance, heat conductivity and insulativity, and the tail part is added with a threaded sleeve and a sealing porcelain head for fixed installation.
Furthermore, the mold heating ring is arranged in the groove, and a U-shaped copper pressing strip is added to the upper half part of the mold heating ring to be attached to the surface of the mold to play a role in heat conduction and sealing.
Furthermore, the mold core is embedded into a mold plate or a non-embedded integral mold core mold plate, the heating ring is provided with a groove around the mold core on the mold plate, the heating resistance wire is arranged in the groove, and then the mold core is filled with a thermal insulation material (such as epoxy resin).
The working principle is as follows: the heating temperature is set through the temperature control box, the current is conducted to the periphery of the mold core when the temperature of the current rises to the set temperature through the resistance of the heating tube in the mold heating ring, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple, or the power supply is recovered when the temperature is lower than the lower limit of the set value. The heating ring is formed by slotting the periphery of the mold core on the template, and filling the heating resistance wire in the mould core by using a thermal insulation material, so that heat can be conducted to the mold core and not to the surface of the mould, and the heat loss is avoided.
The design of the heating ring loop of the mold is required to comply with the requirement of heat balance, and the temperature deviation of the mold cavity/mold core periphery of the mold is controlled within +/-2 ℃. The loop design required for different mold cavity/core arrangements is also different, so that a thermal balance analysis is required. The temperature of the mold core is guaranteed to be uniform as much as possible, and the precision can reach +/-0.5 ℃.
The total power of the upper and lower templates of the hot pressing station is designed to be 84kw, time and electricity are saved at the moment, the coil designed by the device according to the maximum power value can ensure that the time required by the die to rise from the room temperature to the working temperature (130 ℃) is controlled within 10min, and the sizes of the heating tube and the resistance wire need to be calculated and considered according to the maximum power value.
The mold is designed by the following steps:
(1) grooving around the mold cavity and/or the mold core, and placing the mold heating ring in the groove; the heating ring of the mould is arranged in the groove, and a U-shaped copper pressing strip is added on the upper half part of the heating ring to be attached to the surface of the mould to play a role in heat conduction and sealing;
further, the core is loaded into the form by integral or inlaid means and then filled with a thermally insulating material (e.g., epoxy);
(2) arranging a plurality of thermocouples on the die, and measuring the temperature of the die;
(3) and a temperature control box is arranged and connected with the mold heating ring and the thermocouple to set and monitor the temperature.
And (2) a thermal balance analysis step is further included before the step (1), and the heating coil loop design of the die is carried out according to the thermal balance requirement. As shown in fig. 2, the adjacent positions of the two mold heating rings need to design a loop according to heat balance analysis, so that the phenomenon that the temperature of the mold core is uneven due to the fact that some parts of the mold core absorb large heat and some parts absorb small heat is avoided.
The heating temperature is set by the temperature control box, the current is conducted to the periphery of the mold by the heating tube resistor when the temperature of the heating tube resistor is increased to the set temperature, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple or is recovered when the temperature is lower than the lower limit of the set value. The temperature uniformity of the mold core is guaranteed as much as possible, the temperature deviation of the periphery is controlled within +/-2 ℃, and the precision can reach +/-0.5 ℃.
The utility model discloses still claim a paper pulp molding equipment, lift mould device and mould including make-up machine, above-mentioned spring ball formula, the mould includes above-mentioned mould heating collar and temperature control device, and temperature control box and above-mentioned mould heating collar are connected to the make-up machine, come the control operation through P L C and show on the make-up machine operation screen in real time.
Technical scheme of the utility model beneficial effect
Adopt the utility model discloses a paper pulp moulding equipment with spring ball formula lifts mould device has following advantage:
1. and (3) fast die changing: a small amount of manual assistance operations are cooperated, and meanwhile, the hydraulic mold locking device is matched, so that the single mold loading and unloading time of the forming mold of the device can be controlled within 15 minutes.
2. Accurate temperature control: the design of a heating ring loop of the mold is required to comply with the requirement of heat balance, the temperature deviation of the circumference is controlled within +/-2 ℃, the temperature of the mold core is uniform, and the precision can reach +/-0.5 ℃. After the heating resistance wire is placed, the heating resistance wire is filled with a thermal insulation material, so that heat can be conducted to the mold core and not to the surface of the mold, and heat loss is avoided; the temperature control is real-time and accurate, and the surface temperature of the paper pulp molding shaping die is ensured to be consistent, so that the dimensional stability of the paper pulp molding product is ensured, the product deformation is reduced, and the like, and the yield of the paper pulp molding product is improved, and the power consumption is reduced.
3. Reduce the power consumption, traditional workstation heating method design power 108kw (24 heating tubes of upper and lower workstation), heat to target temperature time 30min, the utility model discloses heating device design power 84kw, heat to within 10min of target temperature time, this design energy-efficient economizes on electricity more than 300% to improve production efficiency and machine rate of utilization.
The forming equipment of the paper pulp molding product uses the spring ball type mold lifting device to be matched with the mold constant temperature coil heating device to form an effective SMED system which accords with the molding industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a spring ball type mold lifting device according to the present invention;
fig. 2 is a schematic structural view of the mold heating ring of the present invention;
FIG. 3 is a schematic view of the heating ring structure of the present invention;
FIG. 4 is a schematic view of a heating tube structure;
FIG. 5 is a side view of the spring ball type mold lifting device of the present invention;
FIG. 6 is a schematic structural view of the spring ball device of the present invention;
fig. 7 is a schematic structural view of the forming apparatus of the present invention.
Description of reference numerals:
1-hot pressing lower die, 2-die heating ring, 3-thermocouple, 4-interface, 5-die core, 6-U-shaped copper pressing strip, 7-resistance wire, 8-stainless steel shell, 9-die, 10-thermocouple connection, 11-temperature control box, 12-operation screen, 13-forming machine, 14-connection device, 15-fastener, 16-stainless steel shell, 17-insulating magnesium chloride, 18-heating tube resistance wire, 19-non-heating area, 20-heating area, 21-wire group 1, 2; 22-wire group 3,4,5, 6; 200-a workbench; 201-quick release type roller arm; 202-wheel arm fixing block; 300-spring ball device; 301-a ball; 302-a spring; 303-hydraulic valve V1; 304-a control module; 305-sensor S2; 306-hydraulic valve V2; 307-oil circuit 1; 308-oil path 2; 309-sensor S1.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Examples
Fig. 1 shows a spring ball type mold lifting device of a pulp molding apparatus, which comprises a quick release roller arm 201 and a spring ball device 300.
Wherein, quick detach formula roller arm 201 sets up in workstation 200 one side, links to each other with workstation 200 through wheel arm fixed block 202, attaches one row of slip roller in, and the mould is through with the mode locker on the workstation locking and dismantlement fast, and this device cooperates current mould size (600 x 960), designs 590mm long for actual longitudinal working distance. The wheel arm fixing block 202 is used for fixing and rapidly detaching the wheel arm 201, the wheel arm 201 is hung on the wheel arm fixing block 202 through a lever principle (a cylindrical pin on the wheel arm clamps a groove of the fixing block by self gravity), and when the wheel arm is detached, the wheel arm can be easily detached as long as a force is applied in the opposite direction (upwards).
The spring ball arrangement 300 is arranged on the table 200 with a single ball 301 supported on a spring 302. The spring 302 gauge can be designed to a variety of gauges depending on the actual production mold weight. The spring ball devices 300 are arranged in a matrix to give the mold 9 a uniform force as a whole when it slides.
Based on the actual size (1260 × 960) of the table 200 and the actual size (600 × 960) of the mold of the current molding machine, 64 sets of ball devices (8 × 8) are designed on the design surface of the table, so as to enable the mold 9 to be uniformly stressed in the whole when sliding. The bearing capacity of a single ball spring is 15-20 kgf (the spring force can be designed and adjusted), the mold lifting force with the theoretical value of 960-1280 kgf can be provided, meanwhile, the maximum floating design distance of the balls is 3mm, and the sliding space of the mold is fully guaranteed. The mold 9 is locked by a hydraulic locking device (i.e., a hydraulic mold locker), and whether the mold 9 is in a locked state is sensed by a pressure sensor.
The specific operation steps are as follows:
a. and (3) upper die operation: referring to fig. 1, 6 and 7, the ball 301 is in a floating state under the action of the spring force, at this time, the mold 9 moves from the mold position a on the quick release roller arm 201 to the mold position B on the workbench 200, and after the mold 9 moves to the proper position, the mold 9 slowly descends under the action of the locking force of the mold locker until the mold is attached to the workbench 200, and the upper mold operation of the mold 9 is completed.
b. And (3) lower die operation: and (3) loosening the mold locker, floating the ball 301 upwards under the action of spring force, and moving the mold 9 from the mold position B on the workbench to the mold position A on the quick-release type roller arm to finish the lower mold action of the mold 9.
The forming machine 13 is operated by the control module 304, and instructs the oil pump to transmit oil pressure to the hydraulic locking device through the oil way 1307 and the oil way 2308 to complete locking and unlocking of the die 9; wherein the oil pressure is controlled by a hydraulic valve V1303 and a hydraulic valve V2306, and whether the mold 9 is in a locking state is sensed by a pressure sensor S1309 and a pressure sensor S2306. The control module 304 simultaneously feeds back information to be displayed by the operator panel 12 (connected to the molding machine 13) (fig. 6).
And the control module 304 in the device not only feeds back signals, but also has an error signal correction function, so that the system can be interfered in time to operate incorrectly under the condition that an operator operates the device by mistake.
The manual auxiliary operation is cooperated, and meanwhile, the hydraulic mold locking device is matched, so that the time for loading and unloading the mold once by the forming mold of the device can be controlled within 15 minutes.
After the mold locking action is completed, the mold 9 is fixed on the worktable 200, the temperature control box 11 is started, and the mold heating ring 2 in the mold 9 is controlled to start heating until the set temperature.
The mould 9 of the paper pulp molding product shown in figure 2 is provided with a constant temperature coil heating device which comprises a mould heating ring 2 and a temperature control device, wherein the mould heating ring 2 is arranged on the front side and the back side of the mould 9, a groove is formed around a mould cavity 5 to place the mould heating ring 2 in the groove, the mould heating ring 2 is connected with a power supply through interfaces on the two sides of the mould, and a plurality of thermocouples 3 are arranged on a hot-pressing lower mould 1 to measure the temperature around a mould core 5. The loops of the mold heating rings 2 on the front side and the back side of the mold 9 can be the same or different. The loops on the front side and the back side of the mold 9 in this embodiment are different according to the structure of the mold core. The mold heating ring 2 is placed in the groove, and a U-shaped copper pressing strip 6 is added to the upper half part of the mold heating ring to be attached to the surface of the mold (as shown in figures 3 and 4). The mold core 5 is arranged in the mold plate of the hot-pressing lower mold 1 in an integral or embedded mode, the heating coil 2 is provided with a groove around the mold core 5 on the mold plate, the heating resistance wire 7 is arranged in the stainless steel shell 8 and is arranged in the groove around the mold core 5, the U-shaped copper pressing strip 6 is added to the upper half part of the mold to be attached to the surface of the mold, and then the mold is filled with a thermal insulation material. The loop design required for different mold cavity/core 5 arrangements is also different, so that a thermal balance analysis is required before grooving. The design of the loop of the mold heating ring 2 conforms to the requirement of thermal balance, and the temperature deviation of the mold cavity/mold core 5 circles is controlled within +/-2 ℃.
The temperature control box 11 is connected with the mold heating ring 2, is arranged on one side of the machine table and has the functions of temperature setting and monitoring. The forming machine 13 controls the heating temperature of the workbench through a temperature control element, the heating ring 2 is connected and integrated to the temperature control box 11 on the inner side of the forming machine through a wire group 1,221 and wire groups 3,4,5 and 622, the thermocouples 3 are respectively connected and integrated to the temperature control box 11 through thermocouple wires 10, and the operation screen 12 is connected with the temperature control box 11.
Fig. 7 shows a pulp molding apparatus of the present invention, which includes a molding machine 13, the above-mentioned spring ball type mold lifting device 300 and a mold 9, the mold 9 includes a mold heating ring 2 and a temperature control device, the molding machine 13 is connected to a temperature control box 11 and the above-mentioned mold heating ring 2, and is controlled and operated by a P L C to be displayed on an operation screen 12 of the molding machine in real time, and is also operated by a control module 304 to control a hydraulic locking device to complete locking and unlocking of the mold 9, and the control module 304 simultaneously feeds back information to be displayed through the operation screen 12 connected to the molding machine.
When the paper pulp molding machine works, the total power of the upper and lower templates of the hot pressing station of the paper pulp molding machine 13 is designed to be 84kw, time and electricity are saved at the moment, the time for the mold to rise from room temperature to the required time can be controlled to be about 10min, the heating temperature is set through the temperature control box 11 (the working temperature is set to be 130 ℃ in the embodiment), the current is conducted to the periphery of the mold core 5 through the heating tube resistor 7 in the mold heating ring 2 to enable the temperature to rise to the set temperature, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple 3, or the power supply is recovered. The utility model discloses guarantee mold core temperature is even, and the control of week temperature deviation is within +/-2 degrees centigrade, and is accurate can reach within +/-0.5 degree centigrade. The utility model discloses the control by temperature change is real-time accurate, guarantees that paper pulp molding plastic mould surface temperature is unanimous to guaranteed paper pulp molding product dimensional stability, reduced product deformation etc. thereby improve paper pulp molding product yield, still reduced the power consumption simultaneously, energy-efficient economize on electricity more than 300%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. The spring ball type mold lifting device of the paper pulp molding equipment comprises a quick-release type roller arm and a spring ball device, and is characterized in that the quick-release type roller arm is arranged on one side of a workbench; the spring ball device is arranged on the workbench, and the whole die is uniformly stressed when sliding.
2. The apparatus of claim 1, wherein the quick release roller arm is connected to the platen via an arm fixing block.
3. The pulp molding apparatus spring ball type mold lifting device according to claim 1 or 2, wherein the spring ball device is a ball bearing on a spring.
4. The apparatus of claim 3, wherein the spring ball-type mold lifting device is arranged in a matrix.
5. The apparatus of claim 3, wherein the spring ball device is designed on the design surface of the working table according to the actual size of the working table and the actual size of the mold of the forming machine.
6. The apparatus of claim 2, wherein the mold on the table is locked by a hydraulic locking device, and the locking state is sensed by a pressure sensor.
7. The pulp molding apparatus of claim 2, wherein the mold lifting device is connected to the molding machine through a control module.
8. A pulp molding forming device comprises a forming machine, a spring ball type mold lifting device and a mold, wherein the spring ball type mold lifting device is used for lifting the mold according to any one of claims 1 to 7, the mold comprises a mold heating ring and a temperature control device, the forming machine is connected with the temperature control device and the mold heating ring, the control operation is displayed on an operation screen of the forming machine in real time through P L C, the hydraulic locking device is controlled to complete locking and unlocking of the mold through the operation of a control module, and the control module simultaneously feeds back information to be displayed through the operation screen connected to the forming machine.
9. The pulp molding apparatus of claim 8, wherein the mold heating ring is a groove around the mold cavity and/or the mold core, and the mold heating ring is placed in the groove.
10. The pulp molding apparatus according to claim 8, wherein the temperature control device is connected to the mold heating ring, and the heating temperature of the table is controlled by a temperature control element.
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| CN201921492792.3U CN211171432U (en) | 2019-09-09 | 2019-09-09 | Paper pulp molding equipment with spring ball type mold lifting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110670416A (en) * | 2019-09-09 | 2020-01-10 | 永发（江苏）模塑包装科技有限公司 | Paper pulp molding equipment with spring ball type mold lifting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110670416A (en) * | 2019-09-09 | 2020-01-10 | 永发（江苏）模塑包装科技有限公司 | Paper pulp molding equipment with spring ball type mold lifting device |
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