Tail demoulding structure of a corrugated pipe forming machine

Abstract

The tail demolding structure of a corrugated pipe forming machine of the present invention comprises two tail guide rail seats, the outer ends of the two tail guide rail seats are respectively provided with annular circulation molds, the two annular circulation molds respectively comprise a plurality of corrugated pipe forming modules, a tail demolding groove is provided in the middle between the two tail guide rail seats, a ventilation groove is provided on the corrugated pipe forming module, and further comprises: an auxiliary demolding assembly, which is installed at the top of the starting end of the tail demolding groove, and comprises an air guide block and an air inlet valve installed at the top of the air guide block, a transverse air passage is provided on the air guide block, a longitudinal air passage is provided between the air guide block and the two tail guide rail seats, the transverse air passage, the longitudinal air passage and the ventilation grooves of the two corrugated pipe forming modules at the starting end are connected in sequence; two demolding baffles, both of which are respectively installed between the starting end and the demolding end of the tail demolding groove, and one end of the top of the corrugated pipe forming module is provided with an inclined opening that abuts against the demolding baffle.

Description

Technical Field

[0001] The invention relates to the technical field of a tail demoulding mechanism of a corrugated pipe forming machine, in particular to a tail demoulding structure of a corrugated pipe forming machine. Background Art

[0002] The bellows forming machine, as the name implies, is a special mold equipment specially used for manufacturing bellows. The bellows is a pipe with a wavy structure. The manufacturing process of the bellows is as follows: first, put the plastic material into the extruder, the extruder extrude a section of high-temperature plastic pipe, and the high-temperature plastic pipe is then transported to the bellows forming machine. Then, the bellows forming machine includes an annular circulation mold 2, a head mold clamping mechanism installed at the head of the annular circulation mold 2, a middle mold holding mechanism installed in the middle of the annular circulation mold 2, and a tail demolding mechanism installed at the tail of the annular circulation mold 2. Therefore, the high-temperature plastic pipe first enters the head mold clamping mechanism for mold clamping, then enters the middle mold holding mechanism for mold holding, and finally enters the tail demolding mechanism for demolding. Among them, the annular circulation mold 2 includes a bellows forming module 21, and the tail demolding mechanism includes two symmetrical tail guide rail seats 1, and one end of the tail demolding mechanism is the starting end 30a and the other end is the demolding end 30b.

[0003] However, the above-mentioned existing tail demoulding mechanism is as follows Fig. 9 and 10 As shown, it has the following defects:

[0004] 1. When the two bellows forming modules 21 of the mold are located at the starting end 30a, the temperature of the bellows on the mold cavity 210 between the two bellows forming modules 21 is relatively high, and the bellows is still in the stage of softening and clinging to the wall of the mold cavity 210. When the two bellows forming modules 21 are directly demolded and separated, it is easy to cause "separation and pulling" damage to the bellows, resulting in poor molding quality;

[0005] 2. Between the starting end 30a and the demolding end 30b, the side wall of the bellows forming module 21 slides against the tail rail seat 1. At the same time, the side wall of the bellows forming module 21 and the parting surface 211 of the bellows forming module 21 are arranged in parallel. Therefore, when the side wall of the bellows forming module 21 slides along the tail rail seat, the parting surface 211 of the bellows forming module (the parting surface 211 is inclined in the same direction as the side wall) slides along the inclination, that is, the parting surfaces 211 of the two bellows forming modules 21 are parallel to each other. 1. Demolding along the inclined angle will increase the degree of damage caused by "separation and pulling" (and the bellows will be deformed by pulling along the inclined direction) (Although reducing the demoulding inclination angle will reduce the degree of damage caused by "separation and pulling", too small a demoulding inclination angle will lead to another problem, that is, when the bellows is demoulded, it will expand due to pressure changes. If the expansion is greater than the inclination angle, the bellows molding module will invade the bellows, causing damage to the bellows.)

[0006] In summary, the existing tail demoulding mechanism has two defects: first, direct demoulding and pulling are prone to damage the bellows; second, demoulding and pulling at an inclined angle are prone to damage the bellows. Both of these shortcomings will lead to poor bellows molding quality. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a tail demoulding structure of a corrugated pipe forming machine, which has the following two improvements, both of which have the advantages of facilitating demoulding and improving the quality of corrugated pipe forming, as follows:

[0008] First: an auxiliary demoulding component is installed at the starting end, and the outer wall of the bellows is separated and cooled in advance from the mold cavity between the two bellows forming modules by the cooled positive pressure gas, thus avoiding the damage of the bellows caused by direct demoulding and pulling;

[0009] Second: The two demoulding baffles located between the starting end and the demoulding end ensure that the two bellows forming modules slide obliquely along their respective tail guide seats, and by resisting against their respective inclined openings, the parting surfaces of the two bellows forming modules are always set horizontally, so that the direction of the demoulding force of the two becomes vertical, avoiding the damage of the bellows caused by demoulding and pulling at an inclined angle.

[0010] To achieve the above-mentioned purpose, the present invention provides a tail demolding structure of a corrugated pipe forming machine, comprising two symmetrically arranged tail guide rail seats, the outer ends of the two tail guide rail seats are respectively provided with annular circulation molds, the two annular circulation molds respectively include a plurality of annularly arranged corrugated pipe forming modules, a tail demolding groove is provided in the middle between the two tail guide rail seats, one end of the tail demolding groove is a starting end, and the other end is a demolding end, when the corrugated pipe forming modules of the two annular circulation molds are located at the starting end, the two are molded together, when the corrugated pipe forming modules of the two annular circulation molds slide along the starting end to the demolding end respectively, the two are separated, and a ventilation notch is provided on the corrugated pipe forming module, and further comprising:

[0011] An auxiliary demoulding assembly is installed at the top of the starting end of the tail demoulding groove, and includes an air guide block installed at the top of the two tail guide rail seats and an air inlet valve installed at the top of the air guide block and used to introduce positive pressure gas. A transverse air channel is opened on the air guide block, and a longitudinal air channel is opened between the air guide block and the two tail guide rail seats. The transverse air channel, the longitudinal air channel, and the ventilation slots of the two bellows forming modules at the starting end are sequentially connected;

[0012] Two demoulding baffles are respectively installed between the starting end and the demoulding end of the tail demoulding groove, and the two correspond to the bellows forming modules of the two annular circulation molds one by one. One end of the top of the bellows forming module is provided with an inclined opening that is against the demoulding baffle.

[0013] Preferably, an annular track is provided at the bottom of the outer end of the tail guide rail seat, and the annular circulation mold is slidably connected to the annular track.

[0014] Preferably, a half bellows forming cavity is opened at one end of the bellows forming module, and when the bellows forming modules of the two annular circulation molds are located at the starting end, the two are molded together to form a mold cavity for bellows molding.

[0015] Preferably, the ventilation slot is provided at the other end of the bellows forming module, and the ventilation slot comprises a plurality of sheet-like slots respectively connected to half of the bellows forming cavity.

[0016] Preferably, the upper and lower ends of the sheet-shaped notch are provided with extended openings, and the extended openings are located at the upper and lower sides of half of the bellows forming cavity.

[0017] Preferably, the air guide block is respectively mounted on the top of the two tail guide rail seats by bolts.

[0018] Preferably, a first valve port for introducing positive pressure gas is provided inside one end of the intake valve, a second valve port connected to the transverse airway is provided inside the other end, and a switching element is installed between the first valve port and the second valve port.

[0019] Preferably, the number of the transverse air passages is two, and the two transverse air passages correspond one-to-one with the ventilation slots of the bellows forming modules of the two annular circulation molds.

[0020] Preferably, a parting surface is provided at one end of the bellows forming module.

[0021] Preferably, the two demoulding baffles correspond to the two tail guide rail seats one by one, and the demoulding baffles are assembled with the tail guide rail seats by bolts. The demoulding baffles make the parting surface of the corrugated tube forming module between the starting end and the demoulding end be horizontally arranged.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is provided with an auxiliary demoulding component, which is installed at the top position of the starting end. When the two bellows forming modules are located at the starting end and are about to be demoulded, the auxiliary demoulding component introduces cooled positive-pressure gas through the air inlet valve. The cooled positive-pressure gas enters between the inner wall of the mold cavity and the outer wall of the bellows along the transverse airway, the longitudinal airway, and the ventilation groove. At this time, the cooled positive-pressure gas is used to cool the bellows (to ensure that the bellows is quickly cooled and hardened to avoid being damaged by demoulding), and an auxiliary demoulding force is also applied to separate the outer wall of the bellows from the inner wall of the mold cavity, which is convenient for demoulding the bellows. At the same time, the positive-pressure gas is green and environmentally friendly, flows faster and more continuously than solid media, and is not easy to leak and pollute compared to liquid media.

[0024] 2. The present invention is provided with two demoulding baffles, which are installed between the starting end and the demoulding end. When the two bellows forming modules are demoulded, one end of the top of the bellows forming module is provided with an inclined opening which matches the angle of the demoulding baffle, so that the top end of the bellows forming module abuts against the demoulding baffle (at this time, the inclined opening causes the top end of the bellows forming module to be inclined, but the parting surface of the bellows forming module is horizontal, and the parting surface is set at a certain angle to the top end, and the two angles are inconsistent (in the prior art, the parting surface and the directions of the top end and the side wall are all inclined in the same direction)), so that the parting surface of the bellows forming module is set horizontally, and finally when the two bellows forming modules are demoulded, the parting surfaces of the two bellows parting modules move in the vertical direction, and during the vertical movement, the bellows will not be caused to tilt, pull and deform.

[0025] 3. In summary, the tail demoulding structure of a corrugated pipe forming machine of the present invention benefits from the advantages of 1 and 2 above, and ultimately improves the molding quality of the corrugated pipe during demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a tail demoulding structure of a corrugated tube forming machine provided by an embodiment of the present invention;

[0028] Figure 2 is a top view of a tail demoulding structure of a corrugated tube forming machine provided by an embodiment of the present invention;

[0029] Figure 3 yes Figure 2 A schematic diagram of cutting along the cutting line AA;

[0030] Figure 4 yes Figure 2 A schematic diagram of cutting along the cutting line BB;

[0031] Figure 5 It is a schematic structural diagram of two tail rail seats, an annular circulation mold and a demoulding baffle provided by an embodiment of the present invention;

[0032] Figure 6 is a schematic structural diagram of two bellows forming modules provided by an embodiment of the present invention when they are separated;

[0033] Figure 7 is a schematic structural diagram of two bellows forming modules provided by an embodiment of the present invention when they are molded together;

[0034] Figure 8 It is a separation principle diagram of the two bellows forming modules of the two annular circulation molds provided by an embodiment of the present invention when the two bellows forming modules slide along the starting ends to the demoulding ends respectively;

[0035] Fig. 9 It is a schematic structural diagram of the two bellows forming modules of the two annular circulation molds provided by the prior art when the two modules slide along the starting end to the demoulding end respectively;

[0036] Fig.10It is a schematic diagram of the separation principle of the two bellows forming modules of the two annular circulation molds when they slide along the starting ends to the demoulding ends respectively, provided by the prior art.

[0037] Included in the figure are:

[0038] 1. Tail rail seat; 2. Annular circulation mold; 20. Annular track; 21. Bellows forming module; 210. Mold cavity; 2100. Half of the bellows forming cavity; 211. Parting surface; 22. Ventilation slot; 220. Sheet slot; 2201. Extension slot; 3. Tail demoulding slot; 30a. Starting end; 30b. Demolding end; 4. Auxiliary demoulding assembly; 41. Air guide block; 42. Inlet valve; 420. Switch element; 421. First valve port; 422. Second valve port; 43. Horizontal airway; 44. Longitudinal airway; 5. Demolding baffle; 51. Inclined opening. DETAILED DESCRIPTION

[0039] The technical scheme in this embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in this embodiment of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figures 1 to 10 The embodiment of the present invention provides a tail demolding structure of a bellows forming machine, comprising two symmetrically arranged tail guide rail seats 1, the outer ends of the two tail guide rail seats 1 are respectively provided with annular circulation molds 2, the two annular circulation molds 2 respectively include a plurality of annularly arranged bellows forming modules 21, a tail demolding groove 3 is provided in the middle between the two tail guide rail seats 1, one end of the tail demolding groove 3 is a starting end 30a, and the other end is a demolding end 30b, when the bellows forming modules 21 of the two annular circulation molds 2 are located at the starting end 30a, the two are molded together, when the bellows forming modules 21 of the two annular circulation molds 2 slide along the starting end 30a to the demolding end 30b, the two are separated, and a venting notch 22 is provided on the bellows forming module 21, and further comprising:

[0041] The auxiliary demoulding assembly 4 is installed at the top of the starting end 30a of the tail demoulding groove 3, and includes an air guide block 41 installed at the top of the two tail guide rail seats 1 and an air inlet valve 42 installed at the top of the air guide block 41 and used to introduce positive pressure gas. A transverse air channel 43 is opened on the air guide block 41, and a longitudinal air channel 44 is opened between the air guide block 41 and the two tail guide rail seats 1. The transverse air channel 43, the longitudinal air channel 44, and the ventilation slots 22 of the two bellows forming modules 21 at the starting end 30a are connected in sequence;

[0042] Two demoulding baffles 5 are respectively installed between the starting end 30a and the demoulding end 30b of the tail demoulding groove 3, and the two correspond to the bellows forming modules 21 of the two annular circulation molds 2 one by one. One end of the top of the bellows forming module 21 is provided with an inclined opening 51 that abuts against the demoulding baffle 5. The demoulding baffle 5 and the inclined opening 51 of the bellows forming module 21 are matched to allow the bellows forming module 21 to slide out in the inclined direction while ensuring that the parting surface 211 of the bellows forming module 21 is set horizontally.

[0043] An annular track 20 is provided at the bottom of the outer end of the tail rail seat 1 , and the annular circulation mold 2 is slidably connected to the annular track 20 .

[0044] A half of a bellows forming cavity 2100 is opened at one end of the bellows forming module 21. When the bellows forming modules 21 of the two annular circulation molds 2 are located at the starting end 30a, the two molds are combined to form a mold cavity 210 for bellows forming.

[0045] The venting slot 22 is provided at the other end of the bellows forming module 21, and the venting slot 22 includes a plurality of sheet-shaped slots 220 respectively connected to half of the bellows forming cavity 2100. The plurality of sheet-shaped slots 220 arranged in the same manner ensure the stability of the positive pressure airflow, so that the positive pressure gas is evenly applied to the outer wall surface of the bellows, making the demoulding force more uniform.

[0046] The upper and lower ends of the sheet-shaped notch 220 have extension openings 2201, and the extension openings 2201 are located at the upper and lower sides of the half bellows forming cavity 2100. At the same time, there are two transverse air passages 43, and the two transverse air passages 43 correspond to the ventilation notches 22 of the bellows forming modules 21 of the two annular circulation molds 2 in a one-to-one manner.

[0047] The reason for setting the extension port 2201 is that the extension port 2201 is connected with the left and right lateral air channels 43 respectively, to ensure that when the positive pressure gas is demoulding the outer wall surface of the bellows, the problem of inconsistent air pressure at both ends due to inconsistent demoulding forces at both ends is avoided, and the air pressure of the left and right lateral air channels 43 is the same, and the demoulding forces at both ends of the bellows are the same, so that the bellows can be demoulded better.

[0048] The air guide block 41 is respectively mounted on the top of the two tail rail seats 1 by bolts.

[0049] A first valve port 421 for introducing positive pressure gas is provided inside one end of the intake valve 42, and a second valve port 422 connected to the transverse airway 43 is provided inside the other end. A switch element 420 is installed between the first valve port 421 and the second valve port 422. The switch element 420 is used to connect the first valve port 421 and the second valve port 422 or disconnect the first valve port 421 and the second valve port 422.

[0050] A parting surface 211 is provided at one end of the bellows forming module 21 , and the specific position of the parting surface 211 is located at the end surface of half of the bellows forming cavity 2100 .

[0051] The two demoulding baffles 5 correspond to the two tail rail seats 1 one by one, and the demoulding baffles 5 are assembled with the tail rail seat 1 by bolts. The demoulding baffles 5 make the parting surface 211 of the corrugated tube forming module 21 between the starting end 30a and the demoulding end 30b be horizontally arranged.

[0052] In summary, the working principle and advantages of the tail demoulding structure of a corrugated tube forming machine according to an embodiment of the present invention are as follows:

[0053] S0: The annular circulation mold 2 is driven by the gear drive assembly in the bellows forming machine of the prior art to achieve cyclic reciprocating sliding;

[0054] S1: When the two bellows forming modules 21 of the molded parts enter the starting end 30a and are about to be demoulded and separated, the air inlet valve 42 of the auxiliary demoulding component 4 is opened, and the cooled positive pressure gas is introduced. The positive pressure gas enters along the transverse air channel 43, the longitudinal air channel 44, and the ventilation slots 22 of the two bellows forming blocks in sequence, and enters between the inner wall of the mold cavity 210 and the outer wall of the bellows. The ventilation slots 22 pass through a plurality of sheet slots 220 and the sheet slots 220 through the extended openings 2201, ensuring that the positive pressure gas is uniformly and uniformly applied to the outer wall of the bellows. The bellows cools and hardens, so that the bellows is separated from the mold cavity 210 (or the bellows is not separated from the mold cavity 210, but becomes easier to demould), thereby making the bellows demoulding simpler, avoiding direct demoulding pulling to cause damage to the bellows, and improving the molding quality after demoulding;

[0055] S2: When the two combined bellows forming dies slide from the starting end 30a to the demolding end 30b for demolding, the bellows forming module 21 uses the inclined opening 51 to make one end of the top of the bellows forming module 21 tiltedly abut against the demolding baffle 5, so that the parting surface 211 of the bellows forming module 21 is horizontally set, and finally when the two bellows forming modules 21 are demolded, their parting surfaces 211 are separated from each other in the vertical direction, ensuring that the bellows will not be deformed by tilting and pulling, and can only be deformed by longitudinal pulling and pulling (however, first, after the positive pressure gas is applied to the bellows, the longitudinal pulling and deformation will be less, and second, the bellows itself needs a certain amount of expansion deformation and a certain longitudinal elastic deformation. Therefore, the longitudinal pulling deformation is consistent with the expansion deformation and the longitudinal elastic deformation direction, so the longitudinal pulling deformation can be ignored). Therefore, the damage of the bellows caused by the tilting and pulling of demolding is avoided, and the molding quality after demolding is improved.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tail demoulding structure of a bellows forming machine, comprising two symmetrically arranged tail guide rail seats (1), the outer ends of the two tail guide rail seats (1) are respectively provided with annular circulation molds (2), the two annular circulation molds (2) respectively include a plurality of annularly arranged bellows forming modules (21), a tail demoulding groove (3) is provided in the middle between the two tail guide rail seats (1), one end of the tail demoulding groove (3) is a starting end (30a), and the other end is a demoulding end (30b), when the bellows forming modules (21) of the two annular circulation molds (2) are located at the starting end (30a), the two are molded together, when the bellows forming modules (21) of the two annular circulation molds (2) slide along the starting end (30a) to the demoulding end (30b), the two are separated, and a ventilation slot (22) is provided on the bellows forming module (21), characterized in that: Also includes: An auxiliary demoulding component (4) is installed at the top of the starting end (30a) of the tail demoulding groove (3), and comprises an air guide block (41) installed at the top of the two tail guide rail seats (1) and an air intake valve (42) installed at the top of the air guide block (41) and used for introducing positive pressure gas, wherein a transverse air passage (43) is provided on the air guide block (41), and a longitudinal air passage (44) is provided between the air guide block (41) and the two tail guide rail seats (1), wherein the transverse air passage (43), the longitudinal air passage (44), and the ventilation slots (22) of the two bellows forming modules (21) at the starting end (30a) are sequentially connected; Two demoulding baffles (5), which are respectively installed between the starting end (30a) and the demoulding end (30b) of the tail demoulding groove (3), and which correspond to the bellows forming modules (21) of the two annular circulation molds (2) one by one, and one end of the top of the bellows forming module (21) is provided with an inclined opening (51) that abuts against the demoulding baffle (5); A parting surface (211) is provided at one end of the bellows forming module (21); the two demoulding baffles (5) correspond to the two tail guide rail seats (1) in a one-to-one manner, the demoulding baffles (5) are assembled with the tail guide rail seats (1) by means of bolts, and the demoulding baffles (5) enable the parting surface (211) of the bellows forming module (21) between the starting end (30a) and the demoulding end (30b) to be arranged horizontally.

2. The tail demoulding structure of the corrugated tube forming machine according to claim 1, characterized in that: The bottom of the outer end of the tail rail seat (1) is provided with an annular track (20), and the annular circulation mold (2) is slidably connected to the annular track (20).

3. The tail demoulding structure of the corrugated tube forming machine according to claim 1, characterized in that: A half bellows forming cavity (2100) is provided at one end of the bellows forming module (21). When the bellows forming modules (21) of the two annular circulation molds (2) are located at the starting end (30a), the two are molded together to form a mold cavity (210) for bellows molding.

4. The tail demoulding structure of the corrugated tube forming machine according to claim 3, characterized in that: The venting slot (22) is provided at the other end of the bellows forming module (21), and the venting slot (22) comprises a plurality of sheet-shaped slots (220) respectively connected to half of the bellows forming cavity (2100).

5. The tail demoulding structure of the corrugated tube forming machine according to claim 4, characterized in that: The upper and lower ends of the sheet-shaped notch (220) are provided with extended openings (2201), and the extended openings (2201) are located at the upper and lower sides of half of the bellows forming cavity (2100).

6. The tail demoulding structure of a corrugated tube forming machine according to claim 1, characterized in that: The air guide block (41) is respectively mounted on the top of the two tail guide rail seats (1) by means of bolts.

7. The tail demoulding structure of a corrugated tube forming machine according to claim 1, characterized in that: A first valve port (421) for introducing positive pressure gas is provided inside one end of the air inlet valve (42), and a second valve port (422) connected to the transverse airway (43) is provided inside the other end, and a switch element (420) is installed between the first valve port (421) and the second valve port (422).

8. The tail demoulding structure of a corrugated tube forming machine according to claim 1, characterized in that: The number of the transverse air passages (43) is two, and the two transverse air passages (43) correspond one to one with the ventilation slots (22) of the bellows forming modules (21) of the two annular circulation molds (2).

Images