Method for producing shoe sole through closed mold pouring

Abstract

The invention relates to the technical field of shoe sole manufacturing, in particular to a method for producing a shoe sole through closed mold pouring, which comprises the following steps: S1, placing a drainage mold on a hot pressing table, connecting the drainage mold with a negative pressure machine, inserting a nozzle of a glue pouring machine into a glue pouring port of the drainage mold, and then starting the negative pressure machine; s2, when the negative pressure in the drainage mold reaches a preset value, a glue filling machine is started for glue filling; s3, after glue filling is completed, hot press forming is conducted on the drainage mold, and the shoe sole can be taken out after glue is formed.

Description

Technical Field

[0001] The invention relates to the technical field of sole manufacturing, in particular to a method for producing soles by closed mold perfusion. Background Art

[0002] Polyurethane (PU) is a highly plastic material with a wide range of applications, including textiles, construction, aviation, shipping, transportation, medicine, electronics, and shoemaking. In the shoemaking industry, PU is often used to make soles due to its good wear resistance, insulation, bending resistance, and anti-slip properties. However, in order to enhance the strength of some shoes, a raised sole is added to the toe, which results in most of the material being unable to flow and fill the cavity within the predetermined time, greatly affecting the yield rate of the finished sole and reducing production efficiency. Summary of the invention

[0003] Therefore, in view of the above-mentioned problems, the present invention provides a method for producing soles by closed mold injection.

[0004] To achieve the above object, the technical solution of the present invention is to provide a method for producing soles by closed mold perfusion, comprising the following steps: S1. Place the drainage mold on the hot press table and connect it to the negative pressure machine. Insert the nozzle of the glue filling machine into the glue filling port of the drainage mold, and then start the negative pressure machine. S2. When the negative pressure in the drainage mold reaches a predetermined value, the glue pouring machine is started to pour glue; S3. After the glue pouring is completed, the drainage mold is hot-pressed to form the glue so that the sole can be taken out after the glue is formed.

[0005] Further improvements are as follows: the drainage mold includes: a lower template, an upper template covering the lower template, a cavity opened on the lower template, a punch arranged on the upper template and matching the cavity, a glue filling port opened on the upper template, a flow channel opened between the upper template and the lower template and connected to the glue filling port for allowing the glue to flow into the cavity and the punch, and a drainage device arranged on the upper template and the lower template.

[0006] A further improvement is that the drainage device includes: an air intake port penetrating through the lower template, an air intake pipe inserted into the air intake port and located at one end outside the lower template, and the other end of the air intake pipe is connected to the negative pressure machine.

[0007] A further improvement is that the air intake port is located outside the cavity and away from the glue injection port.

[0008] A further improvement is that: the upper template is also provided with an air suction groove matching the air suction port to improve the air suction efficiency.

[0009] A further improvement is that a sealing groove matching the cavity and the punch is provided on the upper or lower template, a sealing strip is provided in the sealing groove, and the air intake is located inside the sealing groove.

[0010] A further improvement is that a sealing sleeve is also provided on the glue filling port to enhance the sealing performance when the nozzle of the glue filling machine is inserted.

[0011] A further improvement is that: a positioning groove is provided on the lower template, and a positioning block matching the positioning groove is provided on the upper template.

[0012] A further improvement is that: a positioning pin is also provided on the lower template, and a positioning hole matching the positioning pin is also opened on the upper template.

[0013] A further improvement is that one end of the upper template can be hinged on the lower template, a lock is provided between the upper template and the lower template, and handles for easy opening and closing are respectively provided on the upper template and the lower template.

[0014] A further improvement is that the hot press comprises a hot press frame, an upper pressing plate which can slide up and down on the hot press frame, a lower pressing plate which can slide up and down on the hot press frame, and a placement plate which can slide on the hot press frame through a sliding device, and the drainage mold is placed on the placement plate.

[0015] Further improvement is that: the sliding device includes: a telescopic part arranged in the hot press frame, a sliding frame arranged on the hot press frame and connected to the telescopic rod of the telescopic part, a plug-in hole opened on the placement plate, a plug-in column arranged on the sliding frame, and a plurality of rollers arranged on the hot press frame for enhancing the smoothness of movement of the placement plate. When the placement plate is located on the rollers, it does not directly contact the lower pressure plate, and a guide device is also arranged between the hot press frame and the sliding frame.

[0016] A further improvement is that the guide device comprises a guide rod arranged on the hot press frame and a guide hole opened on the sliding frame.

[0017] A further improvement is that: the placement plate is also provided with a plurality of strip-shaped through holes for locking the drainage mold.

[0018] A further improvement is that the glue dispensing machine comprises a glue dispensing machine body, a manipulator arranged on the glue dispensing machine body, and a nozzle arranged on the manipulator and connected to the glue dispensing machine body.

[0019] A further improvement is that in step S2, the glue pouring temperature is 40-60° C. and the glue pouring time is 3-10 seconds.

[0020] A further improvement is that the negative pressure value in step S2 is -0.1 MPa.

[0021] Further improvement is: in step S3, the hot pressing time is 5-10 minutes, the hot pressing temperature is 80-100°C, and the hot pressure is 100-250kg / cm².

[0022] A further improvement is that the weight of the material poured by the glue pouring machine in step S2 is approximately 120% of the weight of the material of the sole.

[0023] A further improvement is that after the sole is hot-pressed in step S3, it needs to be put into a punching machine for punching or a trimming machine for trimming to punch out the part of the sole.

[0024] The advantages and beneficial effects of the present invention are: 1. The production method is simple and convenient, with a high yield rate. The PU is drained through the drainage mold so that it can fill the entire cavity before its fluidity decreases. Compared with the traditional method of using more PU (about 40% more than the sole itself) for extrusion filling, it can better fill the entire cavity, have a higher yield rate, and lower cost.

[0025] 2. The drainage mold is placed on the hot pressing table. After the drainage is completed, the drainage mold can be directly sent between the upper and lower pressing plates of the hot pressing table for hot pressing, thereby eliminating bubbles in the product, improving the product yield, simplifying the production process, and improving production efficiency.

[0026] 3. The production steps are simple, and there is no need to repeatedly move and position the drainage mold, which is convenient for setting up automated processes, reducing labor costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a method for producing soles by closed mold perfusion according to the present invention, in which a drainage mold is in an open state; Figure 2 This is a schematic diagram of an upper template of a drainage mold in a method for producing soles by closed mold perfusion according to the present invention; Figure 3 A schematic top view of a drainage mold in a method for producing soles by closed mold infusion according to the present invention; Figure 4 A bottom view schematic diagram of a drainage mold in a method for producing soles by closed mold infusion according to the present invention; Figure 5 It is a partial cross-sectional schematic diagram of a hot press machine of a method for producing shoe soles by closed mold perfusion according to the present invention; In the figure: 101, lower template; 102, upper template; 103, cavity; 104, punch; 105, glue filling port; 106, air intake port; 107, air intake pipe; 108, air intake groove; 109, sealing groove; 110, sealing strip; 111, sealing sleeve; 112, positioning groove; 113, positioning block; 114, positioning pin; 115, positioning hole; 116, lock; 117, handle; 118, hot press frame; 119, placement plate; 120, telescopic member; 121, sliding frame; 122, plug-in hole; 123, plug-in column; 124, roller; 125, guide rod; 126, fixing plate; 127, through hole. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0029] like Figure 1-Figure 5 As shown, a method for producing a sole by closed mold infusion comprises the following steps: S1, placing the drainage mold on a hot press table and connecting it to a negative pressure machine, inserting the nozzle of the glue filling machine into the glue filling port 105 of the drainage mold, and then starting the negative pressure machine; S2. When the negative pressure in the drainage mold reaches a predetermined value, the glue pouring machine is started to pour glue; S3. After the glue pouring is completed, the drainage mold is hot-pressed to form the glue so that the sole can be taken out after the glue is formed.

[0030] In order to form a negative pressure environment in the mold so that the PU rubber can flow better to various parts of the cavity, the drainage mold includes: a lower template 101, an upper template 102 covering the lower template 101, a cavity 103 opened on the lower template 101, a punch 104 arranged on the upper template 102 and matching the cavity 103, a glue filling port 105 opened on the upper template 102, a flow channel 128 opened between the upper template 102 and the lower template 101 and connected to the glue filling port 105 for allowing the rubber to flow into the cavity and the punch, and a drainage device arranged on the upper template 102 and the lower template 101, the drainage device includes: an air intake port 106 penetrating through the lower template 101, an air intake pipe 107 inserted in the air intake port 106 and located on one end of the outer side of the lower template 101, and the other end of the air intake pipe 107 is connected to a negative pressure machine (not shown in the figure).

[0031] In order to prevent the glue from falling, the air suction port 106 is located outside the cavity 103 and away from the glue injection port 105 .

[0032] In order to speed up the suction speed of the negative pressure machine and improve the efficiency of forming a negative pressure environment, the upper template 102 is also provided with a suction groove 108 matching the suction port 106 to improve the suction efficiency.

[0033] In order to prevent external gas from entering the mold cavity and improve the efficiency of forming a negative pressure environment, a sealing groove 109 matching the mold cavity 103 and the punch 104 is further provided on the upper mold plate 102 or the lower mold plate 101, a sealing strip 110 is provided in the sealing groove 109, the air inlet 106 is located inside the sealing groove 109, and a sealing sleeve 111 is further provided on the glue filling port 105 to enhance the sealing when the nozzle of the glue filling machine is inserted; The sealing strip 110 is a rubber sealing strip 110 , and the sealing sleeve 111 is a rubber sealing sleeve 111 .

[0034] In order to quickly position the upper template 102 and the lower template 101 and prevent the cavity 103 and the punch 104 from deviating, a positioning groove 112 is provided on the lower template 101 , and a positioning block 113 matching the positioning groove 112 is provided on the upper template 102 .

[0035] The lower template 101 is further provided with a positioning pin 114 , and the upper template 102 is further provided with a positioning hole 115 matching the positioning pin 114 .

[0036] In order to facilitate the installation of the upper template 102 and further enhance the sealing, one end of the upper template 102 can be hinged on the lower template 101, and a lock buckle 116 is also provided between the upper template 102 and the lower template 101. The upper template 102 and the lower template 101 are respectively provided with handles 117 for easy opening and closing.

[0037] In order to enable the drainage mold after glue filling to be directly hot-pressed and simplify the production process, the hot press includes: a hot press frame 118, an upper pressing plate (not shown in the figure) that can slide up and down on the hot press frame 118, a lower pressing plate (not shown in the figure) that can slide up and down on the hot press frame 118, and a placement plate 119 that can be slidably set on the hot press frame 118 through a sliding device. The drainage mold is placed on the placement plate 119.

[0038] In order to facilitate the control of the sliding of the placement plate 119, the sliding device includes: a telescopic member 120 arranged in the hot press frame 118, a sliding frame 121 arranged on the hot press frame 118 and connected to the telescopic rod of the telescopic member 120, a plug hole 122 opened on the placement plate 119, a plug column 123 arranged on the sliding frame 121, and a plurality of rollers 124 arranged on the hot press frame 118 for enhancing the smoothness of the movement of the placement plate 119. When the placement plate 119 is located on the rollers 124, it does not directly contact the lower pressing plate. A guiding device is also arranged between the hot press frame 118 and the sliding frame 121. The telescopic member 120 is a telescopic air cylinder, a telescopic oil cylinder, or a telescopic electric cylinder.

[0039] In order to improve the sliding stability of the sliding frame 121 , the guide device includes: a guide rod 125 arranged on the hot press frame 118 , and a guide hole (not shown in the figure) opened on the sliding frame 121 .

[0040] In order to facilitate the fixing of the drainage mold, the placement plate 119 is also provided with a plurality of strip-shaped through holes 127 (not shown in the figure) for locking the drainage mold. The lower template 101 is also provided with a plurality of fixing plates 126, and the fixing plates 126 are provided with through holes 127 matching the strip-shaped through holes 127.

[0041] To facilitate glue pouring, the glue pouring machine includes: a glue pouring machine body (not shown in the figure), a manipulator (not shown in the figure) arranged on the glue pouring machine body, and a nozzle (not shown in the figure) arranged on the manipulator and connected to the glue pouring machine body.

[0042] In order to improve production efficiency, the heat press frame 118 or the glue filling machine body is also provided with a PLC controller, which is electrically connected to the heat press, glue filling machine, negative pressure machine, and telescopic member 120 to control the operation of each component, thereby realizing automated processing and reducing labor costs; When the negative pressure machine detects that the negative pressure in the drainage mold reaches the preset value, it will send a signal to the PLC controller. At this time, the PLC controller controls the glue filling machine to work. After the glue filling is completed, the glue filling machine sends a signal to the PLC controller. At this time, the PLC controller controls the telescopic parts and the hot press to start and complete the hot pressing. After the hot pressing is completed, the hot press sends a signal to the PLC controller. At this time, the PLC controller controls the telescopic parts and the hot press to reset.

[0043] In order to prevent the PU glue from flowing into the air intake port 106 and save production costs, the weight of the material poured by the glue pouring machine in step S2 is approximately 120% of the weight of the sole material.

[0044] In step S2, the glue pouring temperature is 40-60° C., and the glue pouring time is 3-10 seconds.

[0045] The negative pressure value in step S2 is -0.1 MPa.

[0046] In step S3, the hot pressing time is 5-10 minutes, the hot pressing temperature is 80-100° C., and the hot pressing pressure is 100-250 kg / cm².

[0047] After the shoe sole is hot-pressed in step S3, it needs to be put into a punching machine for punching or a trimming machine for trimming to punch out the shoe sole portion.

[0048] Working principle: During production, the suction pipe 107 is first connected to the suction port 106, and then the drainage mold is installed on the placement plate 119. At this time, the nozzle is controlled to be inserted into the glue filling port 105 and abut against the sealing sleeve 111, and the negative pressure machine is started at the same time to vacuum the inside of the drainage mold, thereby forming a negative pressure environment in the drainage mold; After the negative pressure environment is formed, the glue can be poured. At this time, the PU glue will be guided to fill the cavity 103 and the punch 104 under the action of air pressure, which increases the flow speed of the PU glue. In order to prevent the PU glue from flowing into the air inlet 106, the air inlet 106 is arranged on the outside of the cavity 103, and the mass of the poured PU glue is reduced, so that the flow range of the PU glue is controlled before it flows into the air inlet 106. Different from the traditional method of pouring a large amount of PU glue and extruding, it has higher stability and lower production cost. After the glue filling is completed, the negative pressure machine is closed, and the manipulator controls the nozzle to leave the glue filling port 105. At this time, the telescopic member 120 is started, driving the sliding frame 121 and the placement plate 119 to move to the positions corresponding to the upper pressing plate and the lower pressing plate. At this time, the hot press machine is started, and the upper pressing plate and the lower pressing plate are controlled to perform hot pressing on the drainage mold, thereby eliminating bubbles in the rubber material and forming the rubber material into a sole; Finally, open the drainage mold, take out the sole, and remove the excess parts to complete the production of the sole.

[0049] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A method for producing soles by closed mold infusion, characterized in that: The steps include: S1. Place the drainage mold on the hot press table and connect it to the negative pressure machine. Insert the nozzle of the glue filling machine into the glue filling port of the drainage mold, and then start the negative pressure machine. S2. When the negative pressure in the drainage mold reaches a predetermined value, the glue pouring machine is started to pour glue; S3. After the glue pouring is completed, the drainage mold is hot-pressed to form the glue so that the sole can be taken out after the glue is formed.

2. A method for producing soles by closed mold infusion according to claim 1, characterized in that: The drainage mold includes: a lower template, an upper template covering the lower template, a cavity opened on the lower template, a punch arranged on the upper template and matching the cavity, a glue injection port opened on the upper template, a flow channel opened between the upper template and the lower template and connected to the glue injection port for allowing the glue to flow into the cavity and the punch, and a drainage device arranged on the upper template and the lower template.

3. A method for producing soles by closed mold infusion according to claim 2, characterized in that: The drainage device comprises: an air intake port penetrating through the lower template, an air intake pipe inserted in the air intake port and located on one end outside the lower template, and the other end of the air intake pipe is connected to the negative pressure machine.

4. A method for producing soles by closed mold infusion according to claim 3, characterized in that: The air suction port is located outside the cavity and away from the glue injection port.

5. A method for producing soles by closed mold infusion according to claim 3, characterized in that: The upper template is also provided with an air suction groove matching the air suction port to improve the air suction efficiency.

6. A method for producing soles by closed mold infusion according to claim 3, characterized in that: The upper template or the lower template is also provided with a sealing groove matching the mold cavity and the punch, a sealing strip is arranged in the sealing groove, and the air intake port is located at the inner side of the sealing groove.

7. A method for producing shoe soles by closed mold infusion according to claim 3, characterized in that: The glue filling port is also provided with a sealing sleeve to enhance the sealing performance when the nozzle of the glue filling machine is inserted.

8. A method for producing soles by closed mold infusion according to claim 2, characterized in that: The lower template is provided with a positioning groove, and the upper template is provided with a positioning block matching the positioning groove.

9. A method for producing soles by closed mold infusion according to claim 2, characterized in that: The lower template is also provided with a positioning pin, and the upper template is also provided with a positioning hole matching the positioning pin.

10. A method for producing a sole by closed mold infusion according to claim 2, characterized in that: One end of the upper template can be hinged on the lower template, a lock is provided between the upper template and the lower template, and handles for easy opening and closing are respectively provided on the upper template and the lower template.

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