Sleeved sliding type steam system, ETPU steam foaming machine and technology

Abstract

The invention relates to a sleeving sliding type steam system, an ETPU steam foaming machine and a technology, and belongs to the technical field of ETPU forming equipment. The foaming machine adopts the sliding type steam system, a sliding air pipe moves up and down in an air inlet pipe, and the sealing performance between the sliding air pipe and the air inlet pipe is guaranteed through a polytetrafluoroethylene sealing ring with built-in copper powder; according to the steam system, the two Teflon sealing rings are arranged, the Glyd ring is arranged between the two Teflon sealing rings, the air tightness is further improved, the upper mold moving frame is fixedly connected with the sliding air pipe, and compared with a communication mode adopting a telescopic folding hose in the prior art, the steam system is longer in service life and better in sealing performance; according to the foaming technology, the three-station switching type operation mode is adopted, when the lower die fixing base moves to the foaming station to conduct die assembly foaming, the other lower die fixing base conducts discharging and re-feeding on the discharging station, and therefore the working efficiency is greatly improved. And the continuity of foaming production is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of ETPU forming equipment, and particularly relates to a sleeved and sliding steam system, an ETPU steam foaming machine and a process. Background Art

[0002] An ETPU steam foaming machine is a device for producing ETPU (foamed thermoplastic polyurethane elastomer). It converts TPU resin into a material with high resilience and cushioning performance through physical foaming technology. The ETPU steam foaming machine loads ETPU particles into a forming mold and uses steam heating for secondary foaming to fuse adjacent ETPU particles together, and then cools and forms. Its structure generally has steam channels arranged in the upper mold base and the lower mold base. When the mold is closed, the steam channels of the upper mold base and the lower mold base are connected, and steam is introduced into the upper mold base through an air pipe to achieve steam foaming. Existing upper mold bases all need to move up and down for mold closing. Therefore, a telescopic and foldable hose is used to connect the upper mold base and the steam pipe. Due to structural problems, the hose is prone to breakage under the working conditions of long-term contraction and expansion, resulting in steam leakage when passing steam, thus causing insufficient mold closing and foaming temperature and a high defective rate. In view of this, this solution is proposed. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a sleeved and sliding steam system, an ETPU steam foaming machine and a process, in which the sliding air pipe is a hard pipe with a long service life and stable air intake.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a sleeved and sliding steam system, including an air inlet pipe and a sliding air pipe. The inner peripheral surface of the air outlet end of the air inlet pipe is provided with a first annular groove. Annular sealing grooves are formed on both the upper and lower sides of the first annular groove. A Gleason ring is arranged in the first annular groove, and a tetrafluoroethylene sealing ring with built-in copper powder is arranged in the annular sealing groove. The sliding air pipe extends into the inner peripheral surface of the air inlet pipe and slides up and down, and the outer peripheral surface of the sliding air pipe fits with the inner peripheral surfaces of the Gleason ring and the tetrafluoroethylene sealing ring.

[0005] An ETPU steam foaming machine includes a three-station base, two lower mold carrier seats, an upper mold moving frame, an upper mold carrier seat, a lower mold driving component, an upper mold driving component and a sleeved and sliding steam system; The three-station base includes two blanking stations and a foaming station. The two blanking stations are respectively located on both sides of the foaming station. The lower mold driving component drives the two lower mold carrier seats to move between the foaming station and its adjacent blanking stations; The upper mold moving frame is located above the foaming station, the upper mold bearing seat is connected to the lower surface of the upper mold moving frame, a steam channel is arranged in the upper mold bearing seat, a sliding air pipe is connected to the inlet of the steam channel, and the air inlet pipe is fixedly arranged on one side above the upper mold moving frame; The upper die driving assembly is used to drive the upper die moving frame to open and close the die.

[0006] Furthermore, the steam foaming machine further comprises a lower mold fixing seat, the three-station base comprises a slide rail frame, two of the slide rail frames are respectively located on both sides of the lower mold fixing seat body, a clearance notch is formed in the middle of the upper surface of the lower mold fixing seat body, and the unloading station is located on the upper surface of the slide rail frame; The lower mold driving assembly includes a guide rail, two movable seats and a telescopic cylinder body. The guide rail spans the gaps between the two slide rail frames and the lower mold fixed seat. The lower surfaces of the two movable seats are respectively adapted to the guide rails. The two movable seats are connected by a connecting plate. The telescopic cylinder body is arranged on the lower surface of one of the movable seats, and the output end of the telescopic cylinder body passes through the lower surface of the other movable seat and is fixedly connected to the corresponding slide rail frame.

[0007] Furthermore, the steam foaming machine further comprises a lower mold fixing seat, and the foaming station is located on the upper surface of the lower mold fixing seat; The upper mold driving assembly includes multiple upper and lower driving cylinders and multiple guide columns. The multiple upper and lower driving cylinders are arranged in a matrix, and the multiple upper and lower driving cylinders are arranged on the upper surface of the lower mold fixing seat. The output ends of the multiple upper and lower driving cylinders are fixedly connected to the upper mold moving frame. The upper mold moving frame has multiple guide holes. The multiple guide columns respectively pass through the multiple guide holes and the bottoms of the guide columns are fixedly connected to the lower mold fixing seat.

[0008] Further, the lower surface of the lower mold fixing seat is provided with positioning holes on both sides, and the lower surface of the lower mold bearing seat is provided with positioning grooves on both sides, and the positioning grooves and the positioning holes are adapted; The steam foaming machine further comprises a positioning telescopic body, wherein a positioning column is arranged at an output end of the positioning telescopic body, and the positioning telescopic body drives the positioning column to extend from the positioning hole into the positioning groove.

[0009] Furthermore, the number of the guide rails is two and they are arranged at intervals, and sliders are arranged on both sides of the lower surface of the movable seat. The lower surface of the slider has a slide groove, and the slide groove is adapted to the guide rail.

[0010] Furthermore, the lower surface of the movable seat has a connecting protrusion ring, and the middle part of the connecting protrusion ring is provided with a first through hole running through the upper and lower parts. The lower surface of the lower mold bearing seat has a first connecting hole, and the lower mold bearing seat is fixedly connected to the first connecting hole through a connecting member passing through the first through hole.

[0011] An ETPU steam foaming process uses an ETPU steam foaming machine for foaming, including the following steps: S1. Install the upper mold on the lower surface of the upper mold moving frame, install the lower mold on the upper surface of the lower mold fixing seat, and install the sliding air pipe and connect it to the air inlet pipe; S2. Test the airtightness of the sliding air pipe and the air inlet pipe; S3. Detect the sliding accuracy of the two lower mold fixing seats; S4. Feed the lower mold. The two lower molds reciprocate between the foaming station and the adjacent blanking station. When one lower mold is blanking and feeding, the other lower mold is performing steam foaming.

[0012] Furthermore, the specific steps of step S2 are as follows: Block the air outlet holes on the lower surface of the upper mold moving frame, start the air inlet pipe to admit air, observe whether there is steam overflow at the connection between the sliding air pipe and the air inlet pipe. If there is, replace the PTFE sealing ring and the Gleason ring between the sliding air pipe and the air inlet pipe, and conduct the test again. If there is still steam overflow, replace the sliding air pipe.

[0013] Furthermore, the specific working steps of step S4 are as follows: One lower mold fixing seat drives the lower mold to move to the upper surface of the slide rail frame, and the other lower mold fixing seat is located at the foaming station. Fill the lower mold located on the slide rail frame. After filling, the telescopic cylinder body contracts, driving the one lower mold fixing seat to move to the foaming station. After reaching the foaming station, the output end of the positioning telescopic body ejects, and the positioning column passes through the positioning hole and extends into the positioning groove to limit the lower mold fixing seat. The other lower mold fixing seat moves to the adjacent slide rail frame for filling. The upper and lower driving cylinder bodies contract, driving the upper mold moving frame and the upper mold to move downward. The air inlet pipe starts to introduce steam to achieve steam foaming.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a sleeved sliding steam system. By arranging a sliding air pipe sleeved inside the intake pipe, the sliding air pipe can move up and down within the intake pipe. A tetrafluoroethylene seal ring with built-in copper powder is used to ensure the sealing between the two, and a Gleason ring is arranged between the two tetrafluoroethylene seal rings to further ensure the airtightness between the sliding air pipe and the intake pipe. The ETPU steam foaming machine applying this steam system mentioned in the present invention has its upper die moving frame fixedly connected to the sliding air pipe. Compared with the connection method using a telescopic and foldable hose in the prior art, this steam system has a longer service life and better sealing performance, and will not cause the sliding air pipe to rupture and leak air due to the up and down movement of the upper die moving frame for a long time. According to this ETPU steam foaming machine, an ETPU steam foaming process is also provided. This process adopts a three-station switching operation mode. When one lower die fixing seat moves to the foaming station for mold closing and foaming, the other lower die fixing seat performs blanking and reloading at the blanking station, ensuring the continuity of foaming production and improving production efficiency. Description of the Drawings

[0015] Figure 1 It is a three-dimensional structural schematic diagram of an ETPU steam foaming machine of the present invention; Figure 2 It is a front view structural schematic diagram of an ETPU steam foaming machine of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the steam system in the present invention; Figure 4 It is a sectional structural schematic diagram of the steam system in the present invention; Figure 5 It is a three-dimensional structural schematic diagram of two lower die carrier seats and a lower die driving component in the present invention; Figure 6 It is a bottom view structural schematic diagram of the lower die carrier seat in the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the lower die fixing seat in the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the lower die fixing seat in another direction in the present invention; Figure 9 It is a three-dimensional structural schematic diagram of the upper die carrier seat and the lower die carrier seat in the present invention; Figure 10 It is a three-dimensional structural schematic diagram of the upper die carrier seat and the lower die carrier seat in another direction in the present invention; Figure 11 It is a three-dimensional structural schematic diagram of the lower die carrier seat in the present invention; Figure 12 It is a three-dimensional structural schematic diagram of the upper die carrier seat in the present invention.

[0016] Markings in the figure: 1. Three-station base; 11. Central base; 12. Slide rail frame; 121. Unloading station; 2. Lower die fixing seat; 21. Lower die bearing seat; 211. Positioning groove; 22. Relief notch; 23. Foaming station; 24. Positioning hole; 25. Lower die installation groove; 26. Air inlet boss; 27. Second air inlet; 28. Second air passing hole; 3. Upper die moving frame; 4. Upper die bearing seat; 41. Upper die installation groove; 42. Steam channel; 43. Air outlet boss; 44. First air inlet; 45. First air passing hole; 5. Lower die driving assembly; 51. Guide rail; 52. Moving seat; 521. Slide block; 522. Connecting boss; 53. Telescopic cylinder body; 54. Connecting plate; 6. Upper die driving assembly; 61. Driving cylinder body; 62. Guide post; 7. Air inlet pipe; 71. Teflon sealing ring; 72. Gleitring; 8. Sliding air pipe. Detailed implementation mode

[0017] In order to make the above features and advantages of the present invention more obvious and understandable, specific embodiments are hereby given and described in detail below in conjunction with the accompanying drawings.

[0018] As Figures 1-4 shown, this embodiment provides a sleeved sliding steam system, including an air inlet pipe 7 and a sliding air pipe 8.

[0019] On the inner peripheral surface of the air outlet end of the air inlet pipe 7, a first annular groove is provided. Annular sealing grooves are formed on the upper and lower sides of the first annular groove. A Gleitring 72 is arranged in the first annular groove, and a Teflon sealing ring 71 with internal copper powder is arranged in the annular sealing groove. The sliding air pipe 8 extends into the inner peripheral surface of the air inlet pipe 7 and slides up and down. The outer peripheral surface of the sliding air pipe 8 is in contact with the inner peripheral surfaces of the Gleitring 72 and the Teflon sealing ring 71. The use of the Teflon sealing ring 71 with internal copper powder can improve the pressure resistance of the sealing ring and make it have better wear resistance, which is suitable for the multiple reciprocating sliding of the sliding air pipe 8 in the air inlet pipe 7 in this solution. Moreover, the Teflon sealing ring 71 filled with copper powder has better creep resistance than the ordinary Teflon sealing ring 71, which can improve the thermal conductivity and load-bearing capacity of the material. The addition of copper powder can improve the linear expansion coefficient of the Teflon sealing ring 71, making its performance more stable under temperature changes. The Gleitring 72 is used for double-layer leakage prevention. Since the Gleitring 72 is a dynamic seal, it ensures excellent low friction and high-speed performance, no stick-slip movement tendency, a space-saving structure, and excellent high-temperature resistance, and can maintain a stable sealing effect in a high-temperature environment.

[0020] As Figures 1-12 shown, an ETPU steam foaming machine includes a three-station base 1, two lower die bearing seats 21, an upper die moving frame 3, an upper die bearing seat 4, a lower die driving assembly 5, an upper die driving assembly 6, a positioning assembly, and a sleeved sliding steam system mentioned above.

[0021] The three-station base 1 includes a central base 11 and two slide rail frames 12, the two slide rail frames 12 are connected to both sides of the central base 11, and the three-station base has two material removal stations 121 and a foaming station 23, the foaming station 23 is arranged above the central base 11, and the material removal station 121 is arranged on the slide rail frame 12. A lower mold fixing seat 2 is arranged on the upper surface of the central base 11, and a clearance notch 22 is formed in the middle of the upper surface of the lower mold fixing seat 2.

[0022] The lower mold driving assembly 5 drives the two lower mold supporting seats 21 to move between the foaming station 23 and the adjacent unloading station 121. Specifically, the lower mold driving assembly 5 includes two guide rails 51, two moving seats 52 and a telescopic cylinder 53. The two guide rails 51 span the two slide rail frames 12 and the clearance gaps 22 of the lower mold fixed seat 2 and are arranged at intervals. The two moving seats 52 are respectively fixed on the lower surface of the lower mold supporting seat 21. Slide blocks 521 are arranged on both sides of the lower surface of the moving seat 52. The lower surface of the slide block 521 has a slide groove, which is adapted to the guide rail 51. The two moving seats 52 are connected by a connecting plate 54, and the connecting plate 54 is used to synchronize the two lower mold moving seats 52 to move synchronously. The telescopic cylinder body 53 is arranged on the lower surface of one of the moving seats 52, and the output end of the telescopic cylinder body 53 passes through the lower surface of the other moving seat 52 and is fixedly connected to the corresponding slide rail frame 12. The two lower mold moving seats 52 are switched on the foaming station 23 by extending and contracting the output end of the telescopic cylinder body 53. The more preferred implementation method of the telescopic cylinder body 53 is to use an oil cylinder.

[0023] Preferably, the lower surface of the movable seat 52 has a connecting protrusion 522, and the middle of the connecting protrusion 522 is provided with a first through hole running through the upper and lower parts. The lower surface of the lower mold supporting seat 21 has a first connecting hole, and the lower mold supporting seat 21 is fixedly connected to the first connecting hole through a connecting member passing through the first through hole, and the connecting member is a screw.

[0024] The upper mold moving frame 3 is located above the foaming station 23, the upper mold supporting seat 4 is connected to the lower surface of the upper mold moving frame 3, a steam channel 42 is arranged in the upper mold supporting seat 4, a sliding air pipe 8 is connected to the inlet of the steam channel 42, and the air intake pipe 7 is fixedly arranged on one side above the upper mold moving frame 3. Specifically, the upper mold supporting seat 4 has two air inlets, the number of sliding air pipes 8 and the number of air intake pipes 7 are two, and the two air intake pipes 7 are connected to each other.

[0025] Specifically, the upper die carrier base 4 is formed with eight upper die mounting grooves 41. The eight upper die mounting grooves 41 are divided into two rows, with four in each row. Two steam channels 42 are formed inside the upper die carrier base 4. The two steam channels 42 are arranged left and right. The two steam channels 42 are respectively communicated with two sliding air pipes. Four air outlet convex rings 43 are formed on one side of the upper die carrier base 4. One steam channel is communicated with the four upper die mounting grooves 41 in the same row. Specifically, a first air inlet 44 is formed on the side wall of the upper die mounting groove 41 close to one steam channel. A first air through-hole 45 is provided between the left and right adjacent upper die mounting grooves 41, that is, the upper die mounting grooves 41 corresponding to each other in the two rows. The other steam channel is communicated with the air outlet convex ring 43.

[0026] The lower die carrier base 21 is formed with eight lower die mounting grooves 25. The eight lower die mounting grooves 25 are divided into two rows, with four in each row. The eight lower die mounting grooves 25 respectively correspond to the eight upper die mounting grooves 41. Four air inlet convex rings 26 are formed on one side of the lower die carrier base 21. The air inlet convex rings 26 correspond to the air outlet convex rings 43. The air inlet convex rings 26 are communicated with the four lower die mounting grooves 25 in the same row. Specifically, a second air inlet 27 is formed on the side wall of the lower die mounting groove 25 close to the air inlet convex ring 26. A second air through-hole 28 is provided between the left and right adjacent lower die mounting grooves 25. The air inlet convex ring 26, the second air inlet 27, the lower die mounting groove 25, the second air through-hole 28 and another lower die mounting groove 25 form the steam channel of the lower die.

[0027] Steam is introduced from the two steam channels 42. One steam enters one steam channel 42, is discharged into the four upper die mounting grooves 41 in one row from the first air inlet 44, then passes through the first air through-hole 45 and enters the four upper die mounting grooves 41 in the other row; the other steam enters the other steam channel 42, then enters the air outlet convex ring 43, is discharged from the air outlet convex ring 43 into the air inlet convex ring 26, then is discharged into the four lower die mounting grooves 25 from the second air inlet 27, and then passes through the second air through-hole 28 and enters the four lower die mounting grooves 25 in the other row.

[0028] The upper die driving assembly 6 is used to drive the upper die moving frame 3 to perform mold opening and mold closing. Specifically, the upper die driving assembly 6 includes four up-and-down driving cylinders 61 and four guide posts 62. The four up-and-down driving cylinders 61 are arranged in a matrix. The four up-and-down driving cylinders 61 are arranged on the upper surface of the lower die fixing base 2. The output ends of the four up-and-down driving cylinders 61 are fixedly connected to the upper die moving frame 3. The upper die moving frame 3 is provided with four guide holes. The four guide posts 62 respectively pass through the four guide holes and the bottoms of the guide posts 62 are fixedly connected to the lower die fixing base 2. The up-and-down driving cylinders 61 realize mold closing and mold opening through the contraction and extension of the output ends. A more preferred implementation manner of the up-and-down driving cylinders 61 is to select oil cylinders.

[0029] Preferably, a positioning component before mold clamping is further provided on the foaming station 23. The positioning component includes a positioning telescopic body. There are positioning holes 24 on both sides of the lower surface of the lower mold fixing base 2, and the number of positioning holes 24 on each side is 2-4. In this embodiment, the number of positioning holes 24 is 4. There are positioning grooves 211 on both sides of the lower surface of the lower mold bearing seat 21, and the number of positioning grooves 211 on each side is 2-4. In this embodiment, the number of positioning grooves 211 is 8, and 4 are actually used. The positioning grooves 211 and the positioning holes 24 are adapted to each other; a positioning column is provided at the output end of the positioning telescopic body. The positioning telescopic body drives the positioning column to extend from the positioning hole 24 into the positioning groove 211, that is, the positioning telescopic body is fixedly arranged below the positioning hole 24 and the output end is located in the positioning hole 24. A chamfer is formed on the outer side of the upper surface of the positioning column. When the positioning column is pushed in, the positioning of the lower mold bearing seat 21 can be further corrected. A more preferred implementation of the positioning telescopic body is to select an oil cylinder.

[0030] This solution also provides an ETPU steam foaming process, which uses an ETPU steam foaming machine for foaming, including the following steps: S1. Install the upper mold on the lower surface of the upper mold moving frame 3, install the lower mold on the upper surface of the lower mold fixing base 2, and install the sliding air pipe 8 and connect it to the air inlet pipe 7; S2. Test the airtightness of the sliding air pipe 8 and the air inlet pipe 7; the specific steps are as follows: block the air outlet hole on the lower surface of the upper mold moving frame 3 with a wooden plug, start the air inlet of the air inlet pipe 7, and observe whether there is steam overflow at the connection between the sliding air pipe 8 and the air inlet pipe 7. If so, replace the tetrafluoroethylene sealing ring 71 and the Gleason ring 72 between the sliding air pipe 8 and the air inlet pipe 7, and test again. There is still steam overflow, then replace the sliding air pipe 8.

[0031] S3. Detect the sliding accuracy of the two lower mold fixing bases 2; the specific steps are as follows: set a reflector in the positioning groove 211. The center position of the lower surface of the reflector is a plane, and the peripheral surface of the plane is an arc surface. An infrared reflection type sensor is arranged at the position of the positioning hole 24. The infrared reflection type sensor uses the one commonly used in the prior art and will not be described in detail here. During the detection process, when the infrared ray emitted by the infrared reflection type sensor does not hit the plane area of the lower surface of the reflector and the infrared reflection type sensor cannot receive the infrared signal, it means that the telescopic stroke setting of the telescopic cylinder body 53 is incorrect and needs to be adjusted until the infrared reflection type sensor can receive the infrared signal, indicating that the telescopic stroke setting of the telescopic cylinder body 53 is correct and the switching movement distance of the two lower mold fixing bases 2 is in place.

[0032] S4. Feed the lower mold. The two lower molds reciprocate between the foaming station 23 and the adjacent blanking station 121. When one of the lower molds is being blanked and fed, the other lower mold is undergoing steam foaming. The specific steps are as follows: One lower mold fixing base 2 drives the lower mold to move to the upper surface of the slide rail frame 12, and the other lower mold fixing base 2 is located at the foaming station 23. Fill the lower mold located on the slide rail frame 12. After filling, the telescopic cylinder body 53 contracts, driving one lower mold fixing base 2 to move to the foaming station 23. After reaching the foaming station 23, the output end of the positioning telescopic body ejects, and the positioning column passes through the positioning hole 24 and extends into the positioning groove 211 to limit the lower mold fixing base 2. The other lower mold fixing base 2 moves to the adjacent slide rail frame 12 for filling. At the foaming station 23, the upper and lower driving cylinder body 61 contracts, driving the upper mold moving frame 3 and the upper mold to move downward for mold closing. The air inlet pipe 7 starts to introduce steam to achieve steam foaming.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A sleeve sliding steam system, characterized in that: It includes an air intake pipe and a sliding air pipe, the inner circumference of the air outlet end of the air intake pipe is provided with a first annular groove, annular sealing grooves are formed on the upper and lower sides of the first annular groove, a grid ring is provided in the first annular groove, a polytetrafluoroethylene sealing ring with built-in copper powder is provided in the annular sealing groove, the sliding air pipe extends into the inner circumference of the air intake pipe and slides up and down, and the outer circumference of the sliding air pipe is in contact with the inner circumference of the grid ring and the polytetrafluoroethylene sealing ring.

2. An ETPU steam foaming machine, characterized in that: It comprises a three-station base, two lower die bearing seats, an upper die moving frame, an upper die bearing seat, a lower die driving assembly, an upper die driving assembly and a sleeve sliding steam system as claimed in claim 1; The three-station base includes two unloading stations and one foaming station, the two unloading stations are respectively located on both sides of the foaming station, and the lower mold driving assembly drives the two lower mold bearing seats to move between the foaming station and the adjacent unloading station; The upper mold moving frame is located above the foaming station, the upper mold bearing seat is connected to the lower surface of the upper mold moving frame, a steam channel is arranged in the upper mold bearing seat, a sliding air pipe is connected to the inlet of the steam channel, and the air inlet pipe is fixedly arranged on one side above the upper mold moving frame; The upper die driving assembly is used to drive the upper die moving frame to open and close the die.

3. An ETPU steam foaming machine according to claim 2, characterized in that: The steam foaming machine also includes a lower mold fixing seat, the three-station base includes a slide rail frame, the two slide rail frames are respectively located on both sides of the lower mold fixing seat body, a clearance notch is formed in the middle of the upper surface of the lower mold fixing seat body, and the unloading station is located on the upper surface of the slide rail frame; The lower mold driving assembly includes a guide rail, two movable seats and a telescopic cylinder body. The guide rail spans the gaps between the two slide rail frames and the lower mold fixed seat. The lower surfaces of the two movable seats are respectively adapted to the guide rails. The two movable seats are connected by a connecting plate. The telescopic cylinder body is arranged on the lower surface of one of the movable seats, and the output end of the telescopic cylinder body passes through the lower surface of the other movable seat and is fixedly connected to the corresponding slide rail frame.

4. An ETPU steam foaming machine according to claim 2, characterized in that: The steam foaming machine also includes a lower mold fixing seat, and the foaming station is located on the upper surface of the lower mold fixing seat; The upper mold driving assembly includes multiple upper and lower driving cylinders and multiple guide columns. The multiple upper and lower driving cylinders are arranged in a matrix, and the multiple upper and lower driving cylinders are arranged on the upper surface of the lower mold fixing seat. The output ends of the multiple upper and lower driving cylinders are fixedly connected to the upper mold moving frame. The upper mold moving frame has multiple guide holes. The multiple guide columns respectively pass through the multiple guide holes and the bottoms of the guide columns are fixedly connected to the lower mold fixing seat.

5. The ETPU steam foaming machine according to claim 3, characterized in that: The lower surface of the lower die fixing seat is provided with positioning holes on both sides, and the lower surface of the lower die bearing seat is provided with positioning grooves on both sides, and the positioning grooves and the positioning holes are adapted; The steam foaming machine further comprises a positioning telescopic body, wherein a positioning column is arranged at an output end of the positioning telescopic body, and the positioning telescopic body drives the positioning column to extend from the positioning hole into the positioning groove.

6. An ETPU steam foaming machine according to claim 3, characterized in that: There are two guide rails which are arranged at intervals. Slide blocks are arranged on both sides of the lower surface of the moving seat. The lower surface of the slide block has a slide groove, and the slide groove is adapted to the guide rail.

7. An ETPU steam foaming machine according to claim 6, characterized in that: The lower surface of the movable seat has a connecting convex ring, and the middle part of the connecting convex ring is provided with a first through hole running through the upper and lower parts. The lower surface of the lower mold bearing seat has a first connecting hole, and the lower mold bearing seat is fixedly connected to the first connecting hole through a connecting member passing through the first through hole.

8. An ETPU steam foaming process, characterized in that: The ETPU steam foaming machine as described in any one of claims 3 to 7 is used for foaming, comprising the following steps: S1. Install the upper mold on the lower surface of the upper mold moving frame, install the lower mold on the upper surface of the lower mold fixing seat, install the sliding air pipe and connect it to the air inlet pipe; S2. Test the air tightness of the sliding air pipe and the air intake pipe; S3, check the sliding accuracy of the two lower die fixing seats; S4, loading the lower molds, the two lower molds reciprocate between the foaming station and the adjacent unloading station, when one lower mold is unloading and loading, the other lower mold is steam foaming.

9. The ETPU steam foaming process according to claim 8, characterized in that: The specific steps of step S2 are as follows: block the air outlet holes on the lower surface of the upper mold moving frame, start the air intake pipe to observe whether there is steam overflowing from the connection between the sliding air pipe and the air intake pipe. If so, replace the Teflon sealing ring and the Gly ring between the sliding air pipe and the air intake pipe, and test again. If there is still steam overflowing, replace the sliding air pipe.

10. The ETPU steam foaming process according to claim 8, characterized in that: The specific working steps of step S4 are as follows: one of the lower mold fixing seats moves the lower mold to the upper surface of the slide rail frame, and the other lower mold fixing seat is located on the foaming station, and the lower mold located on the slide rail frame is filled. After the filling is completed, the telescopic cylinder body contracts, driving one of the lower mold fixing seats to move to the foaming station. After reaching the foaming station, the output end of the positioning telescopic body is ejected, and the positioning column passes through the positioning hole and extends into the positioning groove to limit the lower mold fixing seat. The other lower mold fixing seat is moved to the adjacent slide rail frame for filling, and the upper and lower driving cylinder bodies contract, driving the upper mold moving frame and the upper mold to move downward, and the air inlet pipe begins to pass steam to realize steam foaming.

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