Sole forming method and shoemaking machine

Abstract

The invention discloses a sole forming method and a shoemaking machine. The problems that a traditional shoemaking machine is high in energy consumption, poor in forming quality, unstable in pressure maintaining and poor in adaptability are solved. The method comprises the steps that a servo motor drives a high-pressure cylinder sliding block to dynamically adjust the pressure of a forming oil cavity, closed-loop control is combined with a pressure sensor, and servo pressurization, servo pressure maintaining and servo pressure reduction are achieved in a staged mode; a matched shoemaking machine adopts a dual-mold closing structure, an elastic rubber sheet seal and a multi-electromagnetic valve pressure supplementing system, and the mold closing precision is ensured by pre-balancing oil pressure. The equipment supports a self-adaptive pressure compensation algorithm and is compatible with shoe materials of different sizes, the forming peak pressure reaches 30 kg / cm < 2 >, the energy consumption is reduced by 70%, and the pressure maintaining loss rate is lower than 0.1%. The method is suitable for small-batch diversified production of sneakers, casual shoes and the like and meets the requirement for efficient and precise forming.

Description

Technical Field

[0001] The present invention relates to the technical field of shoemaking equipment, in particular to a sole forming method and a shoemaking machine. Background Art

[0002] During the shoe molding process, the shoemaking machine aligns and extrudes the shoe. Existing shoemaking machines feature a mating upper and lower cylinder, each with a rubberized surface, creating an extrusion space. During processing, the sole is placed on the rubber of the lower cylinder. The upper and lower cylinders are then closed, securing the sole within the extrusion space. Hydraulic oil is then pumped into the upper and lower cylinders, expanding the rubbers and applying pressure to the sole. This pressure is maintained until peak extrusion is reached. Finally, the oil pump reverses, releasing pressure from the upper and lower cylinders, allowing them to separate, completing the extrusion process.

[0003] The traditional technology is to push hydraulic oil into the molding oil cavity of the molding mold through a hydraulic pump, and receive the pressure of the molding oil cavity as a feedback signal through the control circuit to control the start and stop of the hydraulic pump. This requires the sole molding to be equipped with a hydraulic oil tank, which is easily contaminated and prone to oil leakage. In addition, the control accuracy is poor and the molding effect is not ideal.

[0004] In addition, the existing technology also uses a servo motor to control a hydraulic pump to achieve automatic control. In this technical solution, the control circuit receives the number of turns or stroke of the servo motor and uses it as a feedback signal to control the pressure of the molding oil chamber. Although this improves the control accuracy, when placing different styles or sizes of shoe materials or shoes into the molding die, the volume of the two molding dies is different, which makes the control of the servo motor very complicated. It also makes it impossible for the servo motor to perform the same molding process on different styles or sizes of shoe materials or shoes with the same pressure. It is also unable to adapt to the current small-batch diversified shoemaking model, that is, the styles and sizes of shoe materials or shoes to be processed each day are different, and the number of shoe materials or shoes in each batch is small. This requires shoe factories to frequently adjust the machine every day, and the efficiency is extremely low. This method has now been eliminated by shoemaking companies.

[0005] However, existing shoemaking machines and molding methods have the following disadvantages: 1. High energy consumption; 2. Low extrusion peak and poor molding quality; 3. Easy pressure release during pressure holding, high defective rate; 4. Slow oil loading and unloading speed and low production efficiency. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a sole forming method and a shoe making machine, which, compared with traditional shoe pressing machines, reduce energy consumption, improve pressing stability, and production efficiency.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a sole forming method, comprising the following steps:

[0008] 1) A shoemaking machine is provided. The shoemaking machine is provided with two molds that fit together and are used to press shoe materials or shoes. The molds are provided with a molding oil cavity. An elastic film is provided on the interface of one of the molding dies or on the interface of the two molding dies. The elastic film is sealed and fixed to the interface of the molding dies or to the surface of the corresponding molding oil cavity. The shoemaking machine is also provided with a high-pressure cylinder. A variable pressure cavity is provided in the high-pressure cylinder. A slider is slidably installed on a first side of the variable pressure cavity. The slider is connected to a servo motor. An interface is provided on the second side of the variable pressure cavity. The interface is connected to the corresponding molding oil cavity through a high-pressure pipe. The interior of the variable pressure cavity, the high-pressure pipe and the molding oil cavity are filled with hydraulic oil. The slider reciprocates in the variable pressure cavity to squeeze or release the hydraulic oil in the variable pressure cavity, thereby increasing or reducing the internal pressure of the molding oil cavity.

[0009] 2) Servo pressurization: After the two forming molds are closed, the servo motor drives the slider to move toward one side of the interface, the oil pressure inside the transformer cavity increases, and the slider pushes the hydraulic oil in the transformer cavity into the corresponding forming oil cavity to increase the amount and pressure of the hydraulic oil in the forming oil cavity, thereby realizing the pressing and forming process of the shoe material or shoe;

[0010] 3) Servo pressure holding: The control circuit receives the torque signal from the pressure sensor built into the servo motor, or receives the pressure signal from the pressure sensor built into the molding oil chamber as a feedback control signal to adapt to the automatic processing of shoe materials of different sizes. When the received pressure signal reaches a preset first threshold, the servo motor is controlled to stop and the time for the servo motor to maintain the current torque setting is controlled to perform pressure holding molding on the shoe material;

[0011] 4) Servo decompression: the servo motor drives the slider to retreat and reset, the oil pressure inside the transformer chamber is reduced, and the hydraulic oil inside the molding oil chamber flows back to the transformer chamber.

[0012] In a further technical solution, the servo pressurizing step further includes the following sub-steps:

[0013] 2.1) Rapid pressurization step: before the pressure value sampled by the control circuit of the shoe-making machine reaches the second threshold, the control circuit sends a control signal to the servo motor to start the servo motor to rotate forward, and controls the speed of the servo motor to 1500 rpm to 3000 rpm, so as to drive the slider to compress the pressure-changing chamber, so that the pressure of the molding oil chamber rises to the second threshold within 2-4 seconds, where the second threshold = the first threshold × 0.9;

[0014] 2.2) Slow pressurization step: When the pressure value sampled by the control circuit reaches the second threshold value, the process enters the slow pressurization step, reducing the speed of the servo motor to 1000 rpm to 1500 rpm, and continuing to slowly push the slider forward, so that the pressure in the molding oil chamber rises to the first threshold value within 2-5 seconds, and then enters the servo pressure holding step.

[0015] In a further technical solution, in the servo pressure holding step, the following sub-steps are further provided:

[0016] 3.1) In the internal pressure replenishing step, when the real-time threshold value obtained by the control circuit sampling is less than 99% of the first threshold value, the servo motor is started to rotate forward at a speed of 1000 rpm to 1500 rpm until the real-time threshold value calculated by the control circuit is equal to the first threshold value, so as to avoid lack of pressure in the servo pressure maintaining step.

[0017] In a further technical solution, the shoemaking machine further includes an oil tank, an oil filling pump and at least two solenoid valves, the input end of the oil filling pump is connected to the oil tank, and the solenoid valves are respectively installed at the output end of the oil filling pump, and each solenoid valve is connected to the corresponding molding oil chamber through a high-pressure pipe, and the signals of each solenoid valve are respectively connected to the control circuit.

[0018] Before the servo pressurization step, the following sub-steps are also included:

[0019] 1.1) Balancing step: The molding oil chambers of the two molding molds are respectively provided with pressure sensors. After the two molding molds are closed, the control circuit samples the upper mold starting threshold and the lower mold starting threshold from the two pressure sensors respectively. When the upper mold starting threshold and the lower mold starting threshold are equal, the servo pressurization step is directly entered; when the upper mold starting threshold and the lower mold starting threshold are not equal, the control circuit starts the corresponding solenoid valve and the oil filling pump to replenish the hydraulic oil in the oil tank in the shoemaking machine to the molding oil chamber with the smaller starting threshold, until the upper mold starting threshold and the lower mold starting threshold are equal, and then enters the servo pressurization step.

[0020] In a further technical solution, the lamination pressure of the forming mold is 0-30 kg / cm 2 .

[0021] A shoemaking machine includes two forming molds with two molds mating together, used for pressing shoe materials or shoes, the forming molds are provided with a pressure sensor and a forming oil cavity, the pressure sensor detects the internal pressure acting on the forming oil cavity, an elastic film is provided on the connecting surface of one of the forming molds or on the connecting surface of the two forming molds, the elastic film is sealed and fixed to the connecting surface of the forming molds or the surface of the corresponding forming oil cavity; the shoemaking machine is also provided with a high-pressure cylinder, a variable pressure cavity is provided in the high-pressure cylinder, a slider is slidably mounted on the first side of the variable pressure cavity, the slider is transmission-connected to a servo motor, an interface is provided on the second side of the variable pressure cavity, and the interface is connected to the corresponding forming oil cavity through a high-pressure pipe. The interior of the transformer chamber, the high-pressure pipe and the molding oil chamber are filled with hydraulic oil. The slider reciprocates in the transformer chamber to squeeze or release the hydraulic oil in the transformer chamber, thereby increasing or decreasing the internal pressure of the molding oil chamber. A plurality of ultrasonic transducers are provided on the side of the molding mold, and each ultrasonic transducer is connected to an ultrasonic controller, which is electrically connected to the control circuit. The shoemaking machine also includes an oil tank, an oil filling pump and at least two solenoid valves. The input end of the oil filling pump is connected to the oil tank, and each solenoid valve is installed at the output end of the oil filling pump, and each solenoid valve is connected to the corresponding molding oil chamber through a high-pressure pipe. The signal of each solenoid valve is connected to the control circuit.

[0022] After adopting the above structure, the advantages of the present invention compared with the prior art are:

[0023] 1. Through servo direct drive and dynamic pressure compensation, energy consumption is reduced by 70% compared with traditional models, and production efficiency is increased by 40%.

[0024] 2. It has a step of supplementing internal pressure, which increases the fit of the sole by 25% during the pressure-maintaining stage and reduces the defective rate to below 0.5%.

[0025] 3. Pre-balanced oil pressure enables quick mold change and pressure adjustment, adapts to different sizes of shoe materials, reduces downtime and debugging time, and adapts to small batch and diversified shoemaking modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1 It is a flow chart of the sole forming method of the present invention.

[0028] Figure 2 It is a structural diagram of the shoe making machine in the present invention.

[0029] Figure 3 The schematic diagram of the structure of the high-pressure cylinder in the present invention. DETAILED DESCRIPTION

[0030] The following are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] like Figure 2 and Figure 3 As shown, a shoemaking machine includes two forming molds 9 with two molds for pressing shoe materials or shoes. The forming molds 9 are provided with a pressure sensor 92 and a forming oil cavity. The pressure sensor 92 detects the internal pressure acting on the forming oil cavity. An elastic film 91 is provided on the connecting surface of one of the forming molds 9 or on the connecting surface of the two forming molds 9. The elastic film 91 is sealed and fixed on the connecting surface of the forming mold 9 or on the surface of the corresponding forming oil cavity; the shoemaking machine is also provided with a high-pressure cylinder, a variable pressure cavity 180 is provided in the high-pressure cylinder, a slider is slidably installed on the first side of the variable pressure cavity 180, and the slider is transmission-connected to the servo motor 1. The second side of the variable pressure cavity 180 is provided with an interface, which is connected to the corresponding forming oil cavity through a high-pressure pipe 94. 180, the high-pressure pipe 94 and the interior of the molding oil chamber are filled with hydraulic oil, and the slider reciprocates in the transformer chamber 180 to squeeze or release the hydraulic oil in the transformer chamber 180, thereby increasing or decreasing the internal pressure of the molding oil chamber, wherein a plurality of ultrasonic transducers 93 are provided on the side of the molding mold 9, each ultrasonic transducer 93 is respectively connected to an ultrasonic controller, and the ultrasonic controller is electrically connected to the control circuit; the shoemaking machine also includes an oil tank 6, an oil filling pump 61 and at least two solenoid valves 62, the input end of the oil filling pump 61 is connected to the oil tank 6, and each solenoid valve 62 is respectively installed at the output end of the oil filling pump 61, and each solenoid valve 62 is respectively connected to the corresponding molding oil chamber through the high-pressure pipe 94, and the signal of each solenoid valve 62 is respectively connected to the control circuit.

[0032] Specifically, the shoemaking machine adopts an upper and lower mold structure, the material is high-strength alloy steel, and the mold interface is embedded with an elastic film 91. The lamination pressure is 0-30kg / cm 2 .

[0033] The elastic film 91 is made of high temperature resistant rubber material (thickness 3mm±0.3mm) and is fixed to the edge of the mold cavity by bolts and sealing rings, with a compression permanent deformation rate of ≤5%.

[0034] Molding oil cavity: volume 3.5L, a guide groove (depth 0.5mm, width 2mm) is set on the cavity surface, and is connected to the high-pressure pipe 94 with a flange.

[0035] High-pressure cylinder system: The volume of the pressure-changing chamber 180 is 600 mL, and the slider inside is a piston.

[0036] Servo motor 1: rated power 11kW, repeatability ±0.01mm.

[0037] Hydraulic oil: anti-wear hydraulic oil, operating temperature range 20-80℃.

[0038] Pressure sensor 92: range 0-50kg / cm 2 , accuracy ±0.1%.

[0039] Control circuit: built-in PID algorithm, sampling period 1ms.

[0040] Ultrasonic controller: frequency range 15-25kHz, amplitude adjustable (0.05-0.2mm).

[0041] Fuel tank 6: capacity 30L, built-in heater (power 5kW) and temperature sensor (accuracy ±1℃).

[0042] Oil injection pump 61: variable piston pump (flow rate 0-30L / min adjustable), response time ≤0.05s.

[0043] Solenoid valve group 62: two two-position two-way solenoid valves (response time ≤ 10ms), respectively controlling the upper and lower mold oil chambers and the balance circuit.

[0044] The following table compares the performance of the shoemaking machine provided by this solution with that of a traditional pressing shoemaking machine.

[0045]

[0046] Table 1

[0047] As can be seen from Table 1, the shoemaking machine provided in this embodiment has the following advantages:

[0048] 1. Significant energy saving and consumption reduction: single-mode energy consumption is reduced by 78.7%, and servo direct drive and dynamic pressure compensation technology reduce ineffective energy consumption.

[0049] 2. The molding quality is greatly improved, the maximum mold clamping pressure is increased by 28%, and the pressure control accuracy is improved to ±0.5kg / cm 2 , ensuring the tightness and uniformity of the sole fit. The defective rate was reduced from 1.2% to 0.2%, and ultrasonic-assisted pressing eliminated air bubbles and delamination defects.

[0050] 3. Efficient adaptive production, mold change and debugging time is shortened by 88%. Through pre-balanced oil pressure and dynamic algorithm, it can quickly adapt to the differences in molds of different shoe sizes (such as sizes 36-46).

[0051] 4. Adapt to the diversified needs of small batches, support pressure threshold adjustment within 5 seconds, meet the multi-variety and small batch production mode, and improve production efficiency by more than 40%.

[0052] The shoemaking machine provided in this embodiment solves the problems of high energy consumption, unstable pressure holding, and poor adaptability of traditional shoemaking machines through servo direct drive and dynamic pressure compensation technology, and realizes high-precision, low-energy consumption, and fast-response forming and pressing processing, which is particularly suitable for flexible production scenarios such as sports shoes and casual shoes.

[0053] Specifically, if Figure 3 As shown, the high-pressure cylinder adopts a mechatronics design, including a servo motor 1, a planetary reduction gear 2, a connecting plate 3, a synchronous wheel transmission device, a drive cylinder 13 and a cylinder barrel 18. The planetary reduction gear 2 and the drive cylinder 13 are respectively fixedly mounted on the same side of the connecting plate 3, and the synchronous wheel transmission device is arranged on the other side of the connecting plate 3. The output shaft of the servo motor 1 is connected to the input end of the planetary reduction gear 2, and the output shaft of the planetary reduction gear 2 is connected to the first side of the synchronous wheel transmission device; a driving screw shaft 12 is rotatably installed inside the drive cylinder 13, and the driving screw shaft 12 is connected to the second side of the synchronous wheel transmission device; a screw pair 15 is also slidably installed in the inner cavity of the drive cylinder 13, and the screw pair 15 is movably arranged along its axial direction. The screw pair 15 is threadedly connected to the driving screw shaft 12, and a piston rod 16 is fixed to the front side of the screw pair 15. The piston rod 16 is coaxially matched with the driving screw shaft 12. The interior of the piston rod 16 is hollowed out to form a screw avoidance cavity 160, and the driving screw shaft 12 is movably assembled on the screw The avoidance chamber 160, the oil cylinder barrel 18 is fixed to the side of the drive cylinder 13 away from the connecting plate 3, and the two are coaxially arranged. The interior of the oil cylinder barrel 18 is provided with a variable pressure chamber 180, and a piston member 17 is provided in the variable pressure chamber 180. The piston member 17 is coaxially connected to the piston rod 16 in the axial direction of the variable pressure chamber 180. The side of the oil cylinder barrel 18 away from the drive cylinder 13 is provided with an inlet and outlet joint 22 to connect the shoe material pressing and forming equipment through a high-pressure pipe 242 The forming mold 9 is provided with an elastic film 91 on the pressing surface of the upper and lower forming molds 9. The upper and lower elastic films 91 form a pressing station. The servo cylinder structure, the high-pressure pipe 242 and the forming mold 9 provided in this embodiment form a variable pressure space filled with hydraulic oil. When pressurized, the piston 17 moves toward the inlet and outlet joints 22 and supplies the internal hydraulic oil toward the forming mold 9, so that the upper and lower elastic films 91 absorb the oil pressure and squeeze each other to achieve the pressing of the shoe material.

[0054] The mechatronic servo cylinder replaces traditional hydraulic and pneumatic drive systems, reducing energy consumption and improving the shoe machine's press fit accuracy and pressure-maintaining stability. A power transmission chain consisting of a servo motor (1), a planetary reducer (2), and a synchronous gear transmission converts the servo motor's high speed into high-torque output, significantly improving press fit response speed and boost response time to ≤50ms.

[0055] Specifically, the synchronous wheel transmission device includes an active synchronous wheel 4, a passive synchronous wheel 7 and a synchronous belt 5. The active synchronous wheel 4 and the passive synchronous wheel 7 are respectively rotatably mounted on the outside of the connecting plate 3. The active synchronous wheel 4 is coaxially connected to the output shaft of the planetary reduction device 2, and the passive synchronous wheel 7 is coaxially connected to the driving screw shaft 12. The synchronous belt 5 is respectively wound around the active synchronous wheel 4 and the passive synchronous wheel 7; the outer side of the connecting plate 3 is covered with a belt cover 50, and the belt cover 50 covers the synchronous wheel transmission device.

[0056] Specifically, the connecting plate 3 is provided with a bearing seat 10, which is fixedly mounted on the connecting plate 3 by a locking nut 8; a first bearing 9 is provided on one side of the bearing seat 10 and a second bearing 11 is provided on the other side, and an axial connection portion is provided at the end of the driving screw shaft 12, which is inserted into the first bearing 9 and the second bearing 11, and the axial connection portion extends to the outside of the connecting plate 3 and is coaxially connected to the passive synchronous wheel 7; the driving cylinder 13 is fixed to the bearing seat 10 by bolts and is coaxially arranged therewith.

[0057] The precise coordination between the driving screw shaft 12 and the screw pair 15 converts the rotary motion into the linear motion of the piston rod, and the positioning accuracy of repeated pressing work is high, which solves the mold misalignment problem caused by oil compression in traditional hydraulic cylinders.

[0058] Specifically, the inner cavity of the driving cylinder 13 is provided with an anti-rotation key structure 14, which includes an anti-rotation key strip 141 and an anti-rotation key slot. The anti-rotation key strip 141 and the anti-rotation key slot are respectively provided on the inner wall of the driving cylinder 13 and the screw pair 15. The anti-rotation key strip 141 and the anti-rotation key slot are slidably plugged in to prevent the screw pair 15 and the piston rod 16 from rotating, thereby causing accidental pressure relief.

[0059] The anti-rotation key structure 14 can prevent the screw pair 15 and the piston rod 16 from rotating, thereby preventing accidental pressure release, thereby further improving the pressure supply stability of the structure.

[0060] Specifically, the outer wall of the screw pair 15 is provided with at least one groove 150, and a rubber ring is provided in the groove 150. The screw pair 15 is clamped on the inner wall of the driving cylinder 13 through the rubber ring to avoid hard friction with the inner wall of the driving cylinder 13, thereby improving the stability of the reciprocating motion of the screw pair 15 and the piston rod 16.

[0061] Specifically, a first flange 20 is coaxially fixed to the outer end of the driving cylinder 13, the first end of the cylinder barrel 18 is coaxially installed on the first flange 20, and the second end of the cylinder barrel 18 is coaxially assembled with a second flange 21. A plurality of locking screws 19 are connected between the circumferential portions of the first flange 20 and the second flange 21, and the locking screws 19 are spaced apart along the circumferential direction. The first flange 20 and the second flange 21 are axially locked by the locking screws 19; the inlet and outlet joints 22 are arranged at the center position of the second flange 21.

[0062] Specifically, a pressure sensor is provided on the inner side of the second flange 21 for monitoring the internal pressure of the pressure transformation chamber 180 in real time.

[0063] Specifically, mounting brackets 23 are respectively provided at the bottom of the first flange 20 and the bottom of the second flange 21 .

[0064] Specifically, the piston member 17 includes an inner core member, the outer portion of the inner core member is injection-molded with a piston structure, and the inner side of the inner core member is molded with a connecting port, which is connected to the end of the piston rod 16 .

[0065] Specifically, an electromagnetic brake is provided inside the servo motor 1 .

[0066] like Figure 1 As shown, a sole forming method includes the following steps:

[0067] 1) A shoemaking machine is provided. The shoemaking machine is provided with two molds 9 that fit together for pressing shoe materials or shoes. The mold 9 is provided with a molding oil cavity. An elastic film 91 is provided on the connecting surface of one of the molding dies 9 or on the connecting surface of the two molding dies 9. The elastic film 91 is sealed and fixed on the connecting surface of the molding dies 9 or on the surface of the corresponding molding oil cavity. The shoemaking machine is also provided with a high-pressure cylinder. A variable pressure cavity 180 is provided in the high-pressure cylinder. A slider is slidably mounted on a first side of the variable pressure cavity 180. The slider is connected to a servo motor 1 for transmission. An interface is provided on the second side of the variable pressure cavity 180. The interface is connected to the corresponding molding oil cavity through a high-pressure pipe 94. The interior of the variable pressure cavity 180, the high-pressure pipe 94 and the molding oil cavity are filled with hydraulic oil. The slider reciprocates in the variable pressure cavity 180 to squeeze or release the hydraulic oil in the variable pressure cavity 180, thereby increasing or reducing the internal pressure of the molding oil cavity.

[0068] Before the servo pressurization step, the following sub-steps are also included:

[0069] 1.1) Balancing step: The molding oil chambers of the two molding molds 9 are respectively provided with pressure sensors 92. After the two molding molds 9 are closed, the control circuit samples the upper mold starting threshold and the lower mold starting threshold from the two pressure sensors 92 respectively. When the upper mold starting threshold and the lower mold starting threshold are equal, the servo pressurization step is directly entered; when the upper mold starting threshold and the lower mold starting threshold are not equal, the control circuit starts the corresponding solenoid valve 62 and the oil injection pump 61 to replenish the hydraulic oil in the oil tank 6 in the shoemaking machine to the molding oil chamber with the smaller starting threshold, until the upper mold starting threshold and the lower mold starting threshold are equal, and then enter the servo pressurization step. After closing the mold, the pressure sensor 92 monitors the pressure of the upper and lower mold oil chambers in real time (for example: the initial pressure of the upper mold is 28kg / cm 2 , lower die 26kg / cm 2The control circuit starts the solenoid valve 62 and the oil filling pump 61, and supplies oil to the low-pressure chamber at a flow rate of 2L / min until the pressure difference is ≤0.1kg / cm 2 (Takes about 3 seconds).

[0070] 2) Servo pressurization: After the two molding dies 9 are closed, the servo motor 1 drives the slider to move toward one side of the interface, and the oil pressure inside the transformer chamber 180 increases. The slider pushes the hydraulic oil in the transformer chamber 180 into the corresponding molding oil chamber to increase the amount and pressure of the hydraulic oil in the molding oil chamber, thereby realizing the pressing molding process of the shoe material or shoe.

[0071] The servo pressurization step also includes the following sub-steps:

[0072] 2.1) Rapid pressurization step: Before the pressure value sampled by the control circuit of the shoemaking machine reaches the second threshold, the control circuit sends a control signal to the servo motor 1, starts the servo motor 1 to rotate forward, and controls the speed of the servo motor 1 to 2800 rpm, so as to drive the slider to compress the pressure-transforming chamber 180, so that the pressure of the molding oil chamber rises to the second threshold within 3 seconds. The second threshold = 27 kg / cm 2 ;

[0073] 2.2) Slow pressurization step: When the pressure value sampled by the control circuit reaches the second threshold value, the process enters the slow pressurization step, reduces the speed of the servo motor 1 to 1300 rpm, and continues to slowly push the slider forward, so that the pressure in the molding oil chamber rises to the first threshold value within 2 seconds, and enters the servo pressure holding step.

[0074] 3) Servo pressure holding: the control circuit receives the torque signal of the pressure sensor 92 built into the servo motor 1, or receives the pressure signal of the pressure sensor 92 built into the molding oil chamber as a feedback control signal to adapt to the automatic processing of shoe materials of different sizes. When the received pressure signal reaches a preset first threshold, the servo motor 1 is controlled to stop and the servo motor 1 is controlled to maintain the current torque setting time to perform pressure holding molding on the shoe material.

[0075] In the servo pressure holding step, the following sub-steps are also provided:

[0076] 3.1) In the step of supplementing the internal pressure, the real-time threshold value obtained by the control circuit sampling is less than 29.7 kg / cm 2 When the servo motor 1 is started to rotate forward at a speed of 1200 rpm, the servo motor 1 is started to rotate forward at a speed of 1200 rpm until the real-time threshold value calculated by the control circuit is equal to the first threshold value, so as to avoid pressure shortage in the servo pressure maintaining step.

[0077] 4) Servo decompression: The servo motor 1 drives the slider to retreat and reset, the oil pressure inside the pressure-changing chamber 180 is reduced, and the hydraulic oil inside the molding oil chamber flows back to the pressure-changing chamber 180. The slider retreats at a constant speed of 600 rpm, and the oil pressure drops linearly to 5 kg / cm within 6 seconds. 2 , to avoid deformation of shoe materials caused by sudden pressure drop.

[0078] The sole forming method provided in this embodiment reduces energy consumption by 70% and improves production efficiency by 40% compared with traditional models through servo direct drive and dynamic pressure compensation; multi-level pressure regulation combined with ultrasonic vibration increases the fit of the sole by 25% and reduces the defective rate to below 0.5%; pre-balanced oil pressure enables rapid mold change and pressure adjustment, adapts to different sizes of shoe materials, reduces downtime and debugging time, and adapts to small-batch and diversified shoemaking modes.

[0079] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A sole forming method, characterized in that: The following steps are involved: 1) A shoemaking machine is provided, wherein the shoemaking machine is provided with two mold-matching forming molds (9) for pressing shoe materials or shoes, the forming mold (9) is provided with a forming oil cavity, an elastic film (91) is provided on the connecting surface of one of the forming molds (9) or on the connecting surface of the two forming molds (9), and the elastic film (91) is sealed and fixed on the connecting surface of the forming mold (9) or on the surface of the corresponding forming oil cavity; the shoemaking machine is also provided with a high-pressure cylinder, a variable pressure cavity (180) is provided in the high-pressure cylinder, a slider is slidably installed on the first side of the variable pressure cavity (180), and the slider is connected to the servo motor (1) in a transmission manner, and an interface is provided on the second side of the variable pressure cavity (180), and the interface is connected to the corresponding forming oil cavity through a high-pressure pipe (94), the variable pressure cavity (180), the high-pressure pipe (94) and the interior of the forming oil cavity are filled with hydraulic oil, and the slider reciprocates in the variable pressure cavity (180) to squeeze or release the hydraulic oil in the variable pressure cavity (180), thereby increasing or reducing the internal pressure of the forming oil cavity; 2) Servo pressurization: after the two molding dies (9) are closed, the servo motor (1) drives the slider to move toward one side of the interface, the oil pressure inside the variable pressure chamber (180) increases, and the slider pushes the hydraulic oil in the variable pressure chamber (180) into the corresponding molding oil chamber to increase the amount and pressure of the hydraulic oil in the molding oil chamber, thereby realizing the pressing molding process of the shoe material or shoe; 3) Servo pressure holding, the control circuit receives a torque signal from a pressure sensor (92) built into the servo motor (1), or receives a pressure signal from a pressure sensor (92) built into the molding oil chamber as a feedback control signal, so as to adapt to the automatic processing of shoe materials of different sizes, and controls the servo motor (1) to stop when the received pressure signal reaches a preset first threshold value and controls the servo motor (1) to maintain the current torque setting time, thereby performing pressure holding molding processing on the shoe material; 4) Servo decompression: the servo motor (1) drives the slider to retreat and reset, the oil pressure inside the pressure-changing chamber (180) is reduced, and the hydraulic oil inside the molding oil chamber flows back to the pressure-changing chamber (180).

2. A sole forming method according to claim 1, characterized in that: The servo pressurization step also includes the following sub-steps: 2.1) Rapid pressurization step: before the pressure value sampled by the control circuit of the shoemaking machine reaches the second threshold value, the control circuit sends a control signal to the servo motor (1), starts the servo motor (1) to rotate forward, and controls the speed of the servo motor (1) to be between 1500 rpm and 3000 rpm, so as to drive the slider to compress the variable pressure chamber (180), so that the pressure of the molding oil chamber rises to the second threshold value within 2-4 seconds, where the second threshold value = the first threshold value × 0.9; 2.2) Slow pressurization step: When the pressure value sampled by the control circuit reaches the second threshold value, the process enters the slow pressurization step, reduces the rotation speed of the servo motor (1) to 1000 rpm to 1500 rpm, and continues to slowly push the slider forward, so that the pressure of the molding oil chamber rises to the first threshold value within 2-5 seconds, and enters the servo pressure holding step.

3. A sole forming method according to claim 1, characterized in that: In the servo pressure holding step, the following sub-steps are also provided: 3.1) In the internal pressure replenishing step, when the real-time threshold value obtained by sampling of the control circuit is less than 99% of the first threshold value, the servo motor (1) is started to rotate forward at a speed of 1000 rpm to 1500 rpm until the real-time threshold value calculated by the control circuit is equal to the first threshold value, so as to avoid pressure shortage in the servo pressure maintaining step.

4. A sole forming method according to claim 1, characterized in that: The shoemaking machine further comprises an oil tank (6), an oil injection pump (61) and at least two electromagnetic valves (62), wherein the input end of the oil injection pump (61) is connected to the oil tank (6), and each electromagnetic valve (62) is respectively installed at the output end of the oil injection pump (61), and each electromagnetic valve (62) is respectively connected to the corresponding molding oil cavity through a high-pressure pipe (94), and each electromagnetic valve (62) is respectively connected to the control circuit. Before performing the servo pressurization step, the following sub-steps are also included: 1.1) Balancing step: the molding oil chambers of the two molding dies (9) are respectively provided with pressure sensors (92); after the two molding dies (9) are closed, the control circuit samples the upper mold starting threshold and the lower mold starting threshold from the two pressure sensors (92); when the upper mold starting threshold and the lower mold starting threshold are equal, the servo pressurization step is directly entered; when the upper mold starting threshold and the lower mold starting threshold are not equal, the control circuit starts the corresponding solenoid valve (62) and the oil filling pump (61), and replenishes the hydraulic oil in the oil tank (6) in the shoemaking machine to the molding oil chamber with the smaller starting threshold, until the upper mold starting threshold and the lower mold starting threshold are equal, and then enters the servo pressurization step.

5. The sole forming method according to claim 1, characterized in that: The laminating pressure of the molding die (9) is 0-30 kg / cm 2 .

6. A shoe-making machine, characterized in that: A shoe sole forming method for performing any one of claims 1 to 6, comprising two forming dies (9) with two molds mating with each other for pressing shoe materials or shoes, wherein the forming dies (9) are provided with a pressure sensor (92) and a forming oil cavity, wherein the pressure sensor (92) detects the internal pressure acting on the forming oil cavity, and an elastic film (91) is provided on the interface of one of the forming dies (9) or on the interface of the two forming dies (9), wherein the elastic film (91) is sealed and fixed on the interface of the forming dies (9) or on the surface of the corresponding forming oil cavity. The shoemaking machine is further provided with a high-pressure cylinder, a pressure-changing chamber (180) is provided in the high-pressure cylinder, a slider is slidably mounted on the first side of the pressure-changing chamber (180), the slider is transmission-connected to a servo motor (1), an interface is provided on the second side of the pressure-changing chamber (180), the interface is connected to the corresponding molding oil chamber through a high-pressure pipe (94), the pressure-changing chamber (180), the high-pressure pipe (94) and the molding oil chamber are filled with hydraulic oil, the slider reciprocates in the pressure-changing chamber (180) to squeeze or release the hydraulic oil in the pressure-changing chamber (180), thereby increasing or decreasing the internal pressure of the molding oil chamber, Wherein, a plurality of ultrasonic transducers (93) are provided on the side of the forming mold (9), each ultrasonic transducer (93) is connected to an ultrasonic controller, and the ultrasonic controller is electrically connected to the control circuit; The shoemaking machine further comprises an oil tank (6), an oil injection pump (61) and at least two electromagnetic valves (62). The input end of the oil injection pump (61) is connected to the oil tank (6), and each electromagnetic valve (62) is respectively installed at the output end of the oil injection pump (61). Each electromagnetic valve (62) is respectively connected to a corresponding molding oil cavity through a high-pressure pipe (94). The signal of each electromagnetic valve (62) is respectively connected to the control circuit.

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