A bellows forming apparatus

Abstract

The application discloses a corrugated pipe forming equipment in the technical field of corrugated pipe production equipment, which comprises a forming die device and a pipe expanding device. A plurality of forming die pieces can be arranged at intervals on the pipe blank in a first direction by adjusting the interval of the plurality of forming die pieces in the first direction through a forming drive mechanism. When the pipe expanding device pressurizes the inside of the pipe blank, the pipe blank expands to form a protrusion in the forming groove. Then, the interval of the forming die pieces is adjusted to be smaller through the forming drive mechanism, so that the size of the forming groove in the first direction is reduced, thereby pressing the protrusion formed by the expansion of the pipe blank into the wave crest structure of the corrugated pipe, and the forming processing of the corrugated pipe is realized. After the corrugated pipe is formed, the opening and closing drive mechanism can drive the sub-piece bodies to move away from each other, the corrugated pipe product can be taken out from the forming channel, and the pipe blank can be conveniently put in for the next forming processing. The corrugated pipe forming equipment has high processing efficiency, and the mixed use of the pressing process and the expansion process makes the wave size limitation of the corrugated pipe small.

Description

Technical Field

[0001] This invention relates to the field of corrugated pipe production equipment technology, and in particular to a corrugated pipe forming equipment. Background Technology

[0002] Corrugated pipes are widely used in automotive exhaust systems due to their excellent flexibility, pressure resistance, and extensibility. Corrugated pipe forming primarily relies on compression molding or mechanical bulging processes. In existing technologies, molding equipment using unidirectional pressure through a mold easily leads to uneven pipe wall thickness and poor corrugation consistency; while molding equipment employing multi-pass segmented forming requires repeated loading and unloading of workpieces, resulting in long production cycles and low efficiency. Furthermore, both of these types of corrugated pipe forming equipment have very high requirements for bulging pressure and impose significant limitations on the size and spacing of the corrugated crests and troughs. Summary of the Invention

[0003] The purpose of this invention is to provide a corrugated pipe forming device to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows: A corrugated pipe forming device includes: a forming mold device and a pipe expansion device; The forming mold device includes a forming mold component, a forming drive mechanism, and an opening and closing drive mechanism. The forming mold component includes a plurality of forming mold pieces arranged sequentially along a first direction. Each forming mold piece has a forming hole that extends through the first direction. The plurality of forming holes are interconnected along the first direction to form a forming channel for placing a tube blank. An annular forming groove is formed between two adjacent forming mold pieces, and the forming groove is connected to the forming channel. The forming drive mechanism is used to adjust the spacing between two adjacent forming mold pieces along the first direction to adjust the size of the forming groove in the first direction. Each forming mold piece includes at least two sub-pieces arranged sequentially along the circumference of the forming hole, and the at least two sub-pieces are detachably connected to each other. The opening and closing drive mechanism is used to drive the at least two sub-pieces on each forming mold piece to move closer to each other and further away from each other. The tube expansion device is used to pressurize and expand the interior of the tube blank.

[0005] The corrugated pipe forming equipment provided by this invention has at least the following beneficial effects: the forming drive mechanism can adjust the spacing of multiple forming molds in a first direction, allowing the multiple forming molds to be arranged at certain intervals outside the pipe blank. When the expansion device applies pressure to the inside of the pipe blank, the pipe blank expands and forms a protrusion in the forming groove. Then, by adjusting the spacing of the forming molds through the forming drive mechanism to reduce the size of the forming groove in the first direction, the protrusion formed by the expansion of the pipe blank is compressed into the corrugated pipe's crest structure, thus realizing the corrugated pipe forming process. After the corrugated pipe is formed, the opening and closing drive mechanism can drive the sub-pieces away from each other, allowing the finished corrugated pipe to be removed from the forming channel and easily placed into the pipe blank for the next forming process. The corrugated pipe forming equipment of this invention, through the cooperation of multiple variable-spacing forming molds with expansion processing, can realize the forming production of corrugated pipes with high processing efficiency; the combined use of pressing and expansion processes makes the waveform size of the corrugated pipe less restricted.

[0006] As a further improvement to the above technical solution, the tube expansion device includes a first working end and a second working end spaced apart at both ends of the tube blank along the first direction, and a tube pressure driving mechanism for driving the first working end and the second working end to move closer and further apart from each other. At least one of the first working end and the second working end is provided with a pressurization channel connected to an external high-pressure tube expansion medium source.

[0007] As a further improvement to the above technical solution, the molding drive mechanism includes an outer mold component and a variable pitch drive component. The outer mold component includes a plurality of outer mold pieces arranged sequentially along the first direction. The plurality of outer mold pieces are connected to the molding mold pieces in a one-to-one correspondence. Adjacent outer mold pieces are movably connected to each other so that the distance between two adjacent molding mold pieces in the first direction does not exceed a preset first distance value. The variable pitch drive component is used to drive two outer mold pieces located at both ends of the first direction to move relative to each other along the first direction.

[0008] As a further improvement to the above technical solution, each of the two adjacent outer mold pieces is provided with connecting holes aligned with each other along the first direction, and a connector is inserted into the two aligned connecting holes. The connector is provided with limiting portions at both ends in the first direction, and the two connecting holes are located between the two limiting portions.

[0009] As a further improvement to the above technical solution, the outer mold plate is provided with an outer mold hole that extends through the first direction, the forming mold plate is disposed in the outer mold hole, the inner side of the outer mold hole is provided with a slot that extends circumferentially, and the outer periphery of the forming mold plate is provided with a snap-fit ​​part corresponding to the slot, the snap-fit ​​part being detachably embedded in the slot.

[0010] As a further improvement to the above technical solution, a plurality of the slots are arranged at intervals around the inner side of the outer mold hole, and an clearance space is provided between two adjacent slots for the snap-fit ​​part to pass through along the first direction. The molding die device also includes a rotary drive mechanism for driving the molding die component and the outer mold component to rotate relative to each other.

[0011] As a further improvement to the above technical solution, the outer mold piece includes a first piece, a second piece, and a third piece arranged in sequence along the first direction, and the inner edges of the first piece, the second piece, and the third piece form the slot.

[0012] As a further improvement to the above technical solution, the corrugated pipe forming equipment includes a base frame and a lifting plate, the forming drive mechanism includes a lifting drive component, the lifting drive component is used to drive the lifting plate to move relative to the base frame along the first direction, and the forming mold component and the outer mold component are respectively connected to the base frame and the lifting plate.

[0013] As a further improvement to the above technical solution, a forming part is provided on the inner side of the forming hole, and the forming groove is provided between the forming parts of two adjacent forming mold pieces.

[0014] As a further improvement to the above technical solution, the opening and closing drive mechanism includes an opening and closing base and an opening and closing drive component. The opening and closing base includes a plurality of opening and closing transmission blocks that correspond one-to-one with the sub-pieces. The opening and closing transmission blocks are provided with mold opening and closing guide posts extending along the first direction. The sub-pieces have opening and closing guide holes sleeved on the mold opening and closing guide posts. The opening and closing drive component is used to drive the plurality of opening and closing transmission blocks to move radially along the forming hole. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a front sectional view of an embodiment of the corrugated pipe forming equipment provided by the present invention. Figure 2 This is a side sectional view of an embodiment of the corrugated pipe forming equipment provided by the present invention. Figure 3 This is a bottom view of an embodiment of the corrugated pipe forming equipment provided by the present invention. Figure 4 This is a perspective schematic diagram of an embodiment of the outer mold component and molding die component provided by the present invention; Figure 5 This is a perspective sectional view of an embodiment of the outer mold component and molding die component provided by the present invention; Figure 6This is a top view of one embodiment of the molding mold and outer mold provided by the present invention in a separated state; Figure 7 This is a top view of an embodiment of the molding mold and outer mold provided by the present invention in a connected state; Figure 8 This is a three-dimensional schematic diagram of an embodiment of the molding die and outer die provided by the present invention; Figure 9 This is a side sectional view of an embodiment of the corrugated pipe forming equipment provided by the present invention in a separated state. Figure 10 This is a side sectional view of an embodiment of the corrugated pipe forming equipment provided by the present invention in a connected state.

[0016] In the diagram: 100-forming mold component, 110-forming mold piece, 111-forming hole, 112-sub-piece body, 1121-opening guide hole, 1122-forming piece, 1123-overlapping part, 1124-connecting piece, 1125-upper piece, 1126-middle piece, 1127-lower piece, 113-forming part, 114-clamping part, 200-forming drive mechanism, 210-outer mold component, 211-outer mold piece, 2111-outer mold hole, 2112-connecting hole, 2113-connector, 2114-slot, 2115-avoidance space, 2116-first piece, 2117-second piece 2118 - Third piece, 2119 - Outer mold guide hole, 212 - Outer mold guide post, 220 - Variable pitch drive component, 221 - Clamp head, 230 - Lifting plate, 240 - Lifting drive component, 300 - Opening and closing drive mechanism, 310 - Opening and closing transmission block, 311 - Mold opening and closing guide post, 320 - Opening and closing drive component, 400 - Tube expansion device, 410 - First working end, 420 - Second working end, 430 - Tube pressing drive mechanism, 440 - Pressurization channel, 500 - Base frame, 510 - Base, 511 - Rotating seat, 520 - Top plate, 530 - Guide post, 600 - Rotation drive mechanism. Detailed Implementation

[0017] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0019] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] Reference Figures 1 to 10 The corrugated pipe forming equipment of the present invention is provided in the following embodiments: A corrugated pipe forming device includes: a forming mold device and a pipe expansion device 400.

[0022] The molding die device includes: a molding die component 100, a molding drive mechanism 200, and an opening and closing drive mechanism 300.

[0023] The molding die component 100 includes a plurality of molding die pieces 110, which are arranged sequentially along a first direction. Each molding die piece 110 has a molding hole 111 extending along the first direction, and the molding holes 111 of the plurality of molding die pieces 110 are interconnected along the first direction to form a molding channel for placing a tube blank. An annular molding groove is formed between two adjacent molding die pieces 110, and the molding groove communicates with the molding channel.

[0024] The molding drive mechanism 200 is used to adjust the spacing between two adjacent molding pieces 110 along the first direction, so as to adjust the size of the molding groove in the first direction.

[0025] Each of the molding pieces 110 includes at least two sub-pieces 112 arranged sequentially along the circumference of the molding hole 111, and the at least two sub-pieces 112 are detachably connected to each other. The opening and closing drive mechanism 300 is used to drive the at least two sub-pieces 112 on each molding piece 110 to move closer to each other and further away from each other.

[0026] The tube expansion device 400 is used to pressurize and expand the interior of the tube blank.

[0027] In practical use, the spacing of the multiple forming molds 110 in the first direction is adjusted by the forming drive mechanism 200, so that the multiple forming molds 110 can be arranged at intervals outside the tube blank. When the tube expansion device 400 applies pressure to the inside of the tube blank, the tube blank expands and forms a protrusion in the forming groove. Then, the spacing of the forming molds 110 is adjusted to be smaller by the forming drive mechanism 200, so that the size of the forming groove in the first direction is reduced, thereby pressing the protrusion formed by the expansion of the tube blank into the corrugated structure of the corrugated pipe, realizing the forming process of the corrugated pipe. After the corrugated pipe is formed, the opening and closing drive mechanism 300 drives the sub-piece body 112 away from each other, so that the finished product can be taken out from the forming channel and conveniently put into the tube blank for the next forming process. The corrugated pipe forming equipment of the present invention, through the cooperation of multiple forming molds 110 with variable spacing and tube expansion processing, can realize the forming production of corrugated pipes with high processing efficiency. The combined use of pressing and expansion processes makes the waveform size of the corrugated pipe less restricted.

[0028] In this embodiment, the first direction is the vertical direction, and the tube blank is oriented axially along the vertical direction during processing. In other embodiments, depending on different incoming and outgoing material requirements, or different equipment and site conditions, the first direction may also be the horizontal direction or other directions.

[0029] A forming portion 113 is provided on the inner side of the forming hole 111, and the forming groove is disposed between the forming portions 113 of two adjacent forming mold pieces 110. It is understood that the dimension of the forming portion 113 in the first direction does not exceed the thickness dimension of the forming mold piece 110 in the first direction. The shape and size of the forming portion 113 are set according to the waveform and size of the bellows. When adjacent forming mold pieces 110 abut against each other, the crests of the bellows are formed in the forming groove, that is, formed between two adjacent forming portions 113.

[0030] In this embodiment, the molding drive mechanism 200 includes an outer mold component 210 and a variable-pitch drive component 220. The outer mold component 210 includes a plurality of outer mold pieces 211, which are arranged sequentially along the first direction. The thickness of the outer mold pieces 211 is the same as the thickness of the molding mold piece 110, and the plurality of outer mold pieces 211 are connected to the molding mold piece 110 in a one-to-one correspondence. Two adjacent outer mold pieces 211 in the first direction are movably connected to each other so that the distance between two adjacent molding mold pieces 110 in the first direction does not exceed a preset first distance value. The variable-pitch drive component 220 is used to drive two outer mold pieces 211 located at both ends of the first direction to move relative to each other in the first direction.

[0031] To ensure that the distance between two adjacent molding pieces 110 in the first direction does not exceed a preset first distance value, in this embodiment, two adjacent outer molding pieces 211 are movably connected by a connector 2113. Specifically, each of the two adjacent outer molding pieces 211 is provided with connecting holes 2112 aligned with each other in the first direction. The connector 2113 passes through the two aligned connecting holes 2112, and the connector 2113 is provided with limiting portions at both ends in the first direction. The connecting holes 2112 of the two outer molding pieces 2111 are engaged between the two limiting portions, thereby limiting the maximum distance between the two adjacent outer molding pieces 211.

[0032] The connector 2113 in this embodiment includes a bolt extending vertically and a nut threaded onto the bolt. The two limiting portions are the head of the nut and the head of the bolt, respectively. The connector 2113, consisting of a bolt and a nut, allows the distance between the two limiting portions to be adjusted as needed, thereby allowing the first distance value to be adjusted as required.

[0033] It is worth noting that, in order to keep two adjacent outer mold pieces 211 parallel to each other, the outer mold piece 211 in this embodiment is in the shape of a circular plate, and a plurality of connecting members 2113 and connecting holes 2112 are evenly distributed around the circumference of the outer mold piece 211 on its outer edge. Figure 6 and 7 As shown, each of the outer mold pieces 211 is provided with three connecting parts, which are evenly distributed on the outer edge of the outer mold piece 211. Each connecting part is provided with two connecting holes 2112, which are used to achieve movable connection with the other two outer mold pieces 211 on the upper and lower sides through the connecting member 2113.

[0034] To avoid mutual obstruction between different connectors 2113, the connecting parts of each of the outer mold pieces 211 from top to bottom are staggered, and the multiple connectors 2113 are arranged in a spiral route on the outside of the outer mold component 210.

[0035] To ensure that each outer mold piece 211 is aligned with each other in the vertical direction and to avoid swaying, each outer mold piece 211 is provided with multiple outer mold guide holes 2119. All the outer mold guide holes 2119 of the outer mold pieces 211 are aligned vertically to form a guide channel. An outer mold guide post 212 is provided in the guide channel. The lower end of the outer mold guide post 212 is fixedly connected to the outer mold piece 211 located at the bottom.

[0036] In this embodiment, the outer mold plate 211 and the molding mold plate 110 are interconnected by a groove structure. Specifically, the outer mold plate 211 has an outer mold hole 2111 extending along the first direction, the molding mold plate 110 is disposed in the outer mold hole 2111, the inner side of the outer mold hole 2111 has a circumferentially extending slot 2114, and the outer periphery of the molding mold plate 110 has a snap-fit ​​portion 114 corresponding to the snap-fit ​​slot 2114, the snap-fit ​​portion 114 being embedded in the snap-fit ​​slot 2114.

[0037] The outer mold piece 211 and the molding mold piece 110 are connected by a circumferentially extending snap-fit ​​portion 114 and a slot 2114, so that the outer mold piece 211 and the molding mold piece 110 can move synchronously in the first direction, thereby allowing the distance between two adjacent molding mold pieces 110 to change synchronously with the pitch change action of the outer mold piece 211.

[0038] To avoid obstructing the mutual separation of at least two sub-pieces 112 of the molding mold 110, the outer mold 211 is detachably connected to the molding mold 110. After the molding process is completed, the outer mold component 210 can be separated from the molding mold component 100, thereby facilitating the removal of the molded product.

[0039] Specifically, the outer mold hole 2111 is evenly distributed with a plurality of slots 2114, which are arranged circumferentially around the outer mold hole 2111. A clearance space 2115 is provided between adjacent slots 2114, allowing the latching part 114 to move vertically through. The latching part 114 of the molding die 110 is correspondingly provided with the slots 2114.

[0040] See attached document Figures 6 to 8 In this embodiment, the outer mold hole 2111 is provided with four slots 2114 and a clearance space 2115 arranged at intervals in sequence, and the outer edge of the molding mold piece 110 is provided with four locking parts 114 arranged at intervals. When the outer mold component 210 and the molding mold component 100 rotate relative to each other until the locking parts 114 and the clearance space 2115 are vertically aligned, the molding mold piece 110 can move vertically relative to the outer mold piece 211, realizing the separation of the outer mold component 210 and the molding mold component 100. When the outer mold component 210 and the molding mold component 100 rotate relative to each other until the locking parts 114 are embedded in the slots 2114, the molding mold piece 110 and the outer mold piece 211 are connected to each other in a one-to-one correspondence and move synchronously in the vertical direction.

[0041] In this embodiment, the corrugated pipe forming equipment includes: a base frame 500, and the forming drive mechanism 200 includes a lifting plate 230 and a lifting drive component 240. The lifting plate 230 is slidably connected to the base frame 500 along a first direction, and the lifting drive component 240 is used to drive the lifting plate 230 to move relative to the base frame 500 along the first direction. The forming mold component 100 and the outer mold component 210 are respectively connected to the base frame 500 and the lifting plate 230.

[0042] Specifically, the base frame 500 includes a base 510, a top plate 520, and guide columns 530. The top plate 520 is located above the base 510, and the guide columns 530 extend vertically and connect to the top plate 520 and the base 510. The lifting plate 230 is slidably connected to the guide columns 530. The lifting drive component 240 is a hydraulic cylinder mounted downwards on the top plate 520, and two lifting drive components 240 are arranged in a left-right pair. The piston rod end of the lifting drive component 240 is connected to the lifting plate 230.

[0043] The molding die component 100 and the outer mold component 210 are disposed between the lifting plate 230 and the base 510. In the molding die component 100, the lowermost molding die piece 110 is connected to the base 510. In the outer mold component 210, the uppermost outer die piece 211 is connected to the lifting plate 230. When the lifting drive component 240 drives the lifting plate 230 to move up and down, the relative positions of the molding die component 100 and the outer mold component 210 in the vertical direction can change.

[0044] In this embodiment, the pitch-changing drive component 220 is also a hydraulic cylinder mounted downwards on the top plate 520. Adjacent outer mold pieces 211 are movably connected to each other. To ensure smooth pitch-changing action of the outer mold pieces 211, there are four pitch-changing drive components 220, which are evenly distributed around the circumference of the outer mold pieces 211.

[0045] The outer mold plate 211 has four through holes, and the piston rods of the four variable pitch drive components 220 pass through the holes. The lower end of the piston rod of the variable pitch drive component 220 has a locking head 221 that is engaged with the lower side of the outer mold component 210. When the variable pitch drive component 220 drives the locking head 221 to move upward, the locking head 221 can drive the lowermost outer mold plate 211 to move upward.

[0046] The opening and closing drive mechanism 300 includes an opening and closing base 510 and an opening and closing drive component 320. The opening and closing base 510 includes a plurality of opening and closing transmission blocks 310 corresponding one-to-one with each of the sub-pieces 112. Each opening and closing transmission block 310 is provided with a mold opening and closing guide post 311 extending along the first direction. Each sub-piece 112 has an opening and closing guide hole 1121 sleeved on the mold opening and closing guide post 311. The mold opening and closing guide post 311 and the opening and closing guide hole 1121 are arranged one-to-one. To avoid swaying and displacement, each sub-piece 112 is provided with a plurality of opening and closing guide holes 1121, and each opening and closing transmission block 310 is provided with a plurality of mold opening and closing guide posts 311. The opening and closing drive component 320 is used to drive the plurality of opening and closing transmission blocks 310 to move radially along the forming hole 111.

[0047] In this embodiment, the opening and closing transmission block 310 is slidably mounted on the base 510 along the radial direction of the forming hole 111. The opening and closing drive component 320 can be a linear drive component such as a cylinder, electric push rod, hydraulic push rod, or lead screw and nut drive assembly.

[0048] To enable relative rotation between the molding die component 100 and the outer mold component 210, a rotating seat 511 is provided between the molding die component 100 and the base 510. The rotating seat 511 is rotatably connected to the base 510, and its rotation axis is coaxial with the molding hole 111. Both the opening / closing drive mechanism 300 and the molding die component 100 are mounted on the rotating seat 511. The molding die device also includes a rotary drive mechanism 600 for driving the molding die component 100 and the outer mold component 210 to rotate relative to each other around the first direction.

[0049] See attached document Figure 1 and 2 The rotating seat 511 has a rotating shaft in the middle, which is rotatably inserted through the base 510. The upper end of the rotating shaft is fixedly connected to the rotating seat 511, and the lower end of the rotating shaft passes through the base 510.

[0050] The rotary drive mechanism 600 is a telescopic cylinder. The piston rod end of the rotary drive mechanism 600 is eccentrically hinged to the rotary shaft. When the rotary drive mechanism 600 rotates, it can drive the rotary seat 511 to rotate through the rotary shaft, thereby causing the molding die component 100 to rotate 45° relative to the outer die component 210. This allows the snap-fit ​​part 114 to rotate from the clearance space 2115 into the slot 2114, or to rotate the snap-fit ​​part 114 out of the slot 2114 into the clearance space 2115.

[0051] In this embodiment, the tube expansion device 400 includes a first working end 410, a second working end 420, and a tube pressing drive mechanism 430. The first working end 410 and the second working end 420 are spaced apart at both ends of the tube blank along the first direction. At least one of the first working end 410 and the second working end 420 is provided with a pressurizing channel 440 connected to an external high-pressure tube expansion medium source. The tube pressing drive mechanism 430 is used to drive the first working end 410 and the second working end 420 to move closer to each other and further away from each other.

[0052] See attached document Figure 1 In this embodiment, the first working end 410 is located above the second working end 420. The pressure tube driving mechanism 430 is a hydraulic cylinder mounted on the top plate 520. The lower end of the piston rod of the pressure tube driving mechanism 430 is provided with a pressure tube head. The first working end 410 is located at the pressure tube head and is coaxially arranged with the forming channel. The second working end 420 is located at the upper end of the rotating shaft. The pressurizing channel 440 extends along the axis of the rotating shaft. The lower end of the rotating shaft is provided with a sliding sleeve. The pressurizing channel 440 is connected to an external high-pressure tube expansion medium source through the sliding sleeve.

[0053] To reduce the processing cost of the slot 2114, the outer mold piece 211 of this embodiment includes a first piece 2116, a second piece 2117, and a third piece 2118 arranged sequentially in the first direction. The first piece 2116, the second piece 2117, and the third piece 2118 are all in the shape of a thin annular plate. In the projection along the first direction, the outer edges of the first piece 2116, the second piece 2117, and the third piece 2118 coincide. The inner edge of the second piece 2117 extends in a circular shape, and the inner edges of the first piece 2116 and the second piece 2117 have retaining edges protruding from the inner edge of the second piece 2117. The retaining edges of the first piece 2116 and the third piece 2118, together with the inner edge of the second piece 2117, form the slot 2114.

[0054] In this embodiment, each molding die 110 includes two sub-die bodies 112, each sub-die body 112 being a semi-circular annular plate, and the two sub-die bodies 112 are arranged symmetrically to form the molding hole 111. Driving the two sub-die bodies 112 to move closer or further apart can realize the opening and closing of the mold component, facilitating the loading and unloading of the blank and the molded product. In other embodiments, the number of sub-die bodies 112 may be three or more, and the three or more sub-die bodies 112 can move radially along the corresponding molding hole 111 to realize the opening and closing of the mold component.

[0055] In this embodiment, the sub-piece body 112 includes a molding piece 1122 and a connecting piece 1124, wherein the connecting piece 1124 is sleeved on the outer edge of the molding piece 1122. In the two paired sub-piece bodies 112, the two molding pieces 1122 form a ring shape and form the molding hole 111, and the two connecting pieces 1124 form a ring shape and are sleeved on the outer periphery of the molding piece 1122.

[0056] The snap-fit ​​portion 114 is located on the outer edge of the connecting piece 1124. The forming portion 113 is located on the inner edge of the forming piece 1122, and the outer edge of the forming piece 1122 has an overlapping portion 1123 that overlaps the inner edge of the connecting piece 1124. The forming piece 1122 is connected to the connecting piece 1124 through the overlapping portion 1123, so that when the connecting piece 1124 moves upward, the corresponding forming piece 1122 can move upward synchronously. The sub-piece body 112 adopts a split structure combining the forming piece 1122 and the connecting piece 1124, which can reduce the amount of material replacement when maintaining or changing the specifications of the forming mold component 100, thus saving costs.

[0057] Further, the connecting piece 1124 includes an upper piece 1125, a middle piece 1126, and a lower piece 1127, which are arranged sequentially in a vertical direction to form the connecting piece 1124. The outer edges of the upper piece 1125 and the lower piece 1127 overlap each other in the vertical direction. The outer edge of the middle piece 1126 has a snap-fit ​​edge protruding from the outer edges of the upper piece 1125 and the lower piece 1127. The outer edges of the upper piece 1125 and the lower piece 1127, together with the snap-fit ​​edge of the middle piece 1126, form the snap-fit ​​portion 114. The inner edge of the upper piece 1125 is provided according to the overlapping portion 1123 of the molded piece 1122, and the overlapping portion 1123 overlaps the upper side of the middle piece 1126.

[0058] The split-structure outer mold piece 211 can directly form the slot 2114 through the first piece 2116, the second piece 2117, and the third piece 2118, avoiding the problems of high processing difficulty and high processing cost of the slot 2114. Similarly, the split-structure connecting piece 1124 can directly form the snap-fit ​​part 114 through the upper piece 1125, the middle piece 1126, and the lower piece 1127, saving processing costs.

[0059] The molding drive mechanism 200 in this embodiment includes an outer mold component 210, a pitch-changing drive component 220, and a lifting drive component 240. In actual production, the pitch-changing action of the outer mold component 210 is achieved through the cooperation of the pitch-changing drive component 220 and the lifting drive component 240.

[0060] Specifically, when using the corrugated pipe forming equipment of the present invention to produce corrugated pipes: First, both the lifting drive component 240 and the pitch drive component 220 retract upwards, causing the outer mold pieces 211 of the outer mold component 210 to abut against each other and be positioned above the forming mold component 100. The opening and closing drive component 320 drives the two opening and closing transmission blocks 310 to move away from each other, and the mold component is in an open state. At this time, a cylindrical tube blank is placed between the sub-pieces 112, and the lower end of the tube blank is fitted onto the second working end 420. Then, the opening and closing drive component 320 drives the two opening and closing transmission blocks 310 to move closer to each other, causing the paired sub-pieces 112 to abut against each other, confining the tube blank within the forming channel.

[0061] Next, the tube pressing drive mechanism 430 drives the first working end 410 downward, so that the first working end 410 is inserted and pressed against the upper end of the tube blank. At the same time, the lifting drive component 240 and the pitch drive component 220 both extend downward to their lower limit positions, so that the outer mold component 210 is sleeved on the outside of the forming mold component 100, and the outer mold piece 211 and the forming mold piece 110 correspond to each other and are flush.

[0062] Then, the rotary drive mechanism 600 actuates, causing the rotating seat 511 to rotate 45°, so that the snap-fit ​​part 114 rotates from the clearance space 2115 into the slot 2114, realizing the connection between the outer mold piece 211 and the forming mold piece 110. Afterwards, the lifting drive member 240 retracts upwards while the variable pitch drive member 220 remains in place, so that the distance between each outer mold piece 211 and the forming mold piece 110 increases to a preset first distance value. The outer mold piece 211 at the bottom end is connected to the forming mold piece 110 at the bottom end, and remains connected to the base 510 with a constant height. At this time, the tube expansion device 400 pressurizes the tube blank through the pressurizing channel 440 of the second working end 420. The tube blank expands and deforms in the forming channel, forming a radially annular protrusion between the forming parts 113 of two adjacent forming mold pieces 110.

[0063] Then, the pressing drive mechanism 430 and the lifting drive component 240 extend downwards simultaneously. The pressing drive mechanism 430 drives the first working end 410 to press down on the upper end of the tube blank. Under the drive of the lifting plate 230, each outer mold piece 211 and forming mold piece 110 closes and abuts downwards. The height of the forming groove becomes smaller, and the adjacent forming part 113 presses the protrusion formed by the expansion of the tube blank into the corrugated structure of the corrugated tube.

[0064] Finally, the rotary drive mechanism 600 drives the rotating seat 511 to rotate 45°, causing the locking part 114 to rotate out of the slot 2114 into the clearance space 2115, and the outer mold component 210 disengages from the forming mold component 100. Afterwards, the lifting drive component 240 and the pitch drive component 220 both retract upwards, causing the outer mold component 210 to rise and clear the circumferential space of the forming mold component 100. The opening and closing drive component 320 drives the two opening and closing transmission blocks 310 to move away from each other, allowing the molded product to be removed and a new tube blank to be placed for the next molding process.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the invention. All such changes, modifications, equivalent alterations or substitutions are included within the scope defined by the claims of this application, and the scope of the invention is defined by the claims and their equivalents.

Claims

1. A corrugated pipe forming equipment, characterized in that: include: A molding die device includes a molding die component, a molding drive mechanism, and an opening and closing drive mechanism. The molding die component includes a plurality of molding die pieces arranged sequentially along a first direction. Each molding die piece has a molding hole extending along the first direction. The plurality of molding holes are interconnected along the first direction to form a molding channel for placing a tube blank. An annular molding groove is formed between two adjacent molding die pieces, and the molding groove is connected to the molding channel. The molding drive mechanism is used to adjust the spacing between two adjacent molding die pieces along the first direction to adjust the size of the molding groove in the first direction. Each molding die piece includes at least two sub-die bodies arranged sequentially along the circumference of the molding hole, and the at least two sub-die bodies are detachably connected to each other. The opening and closing drive mechanism is used to drive the at least two sub-die bodies on each molding die piece to move closer to each other and further away from each other. An expansion device is used to pressurize and expand the interior of the tube blank.

2. The corrugated pipe forming equipment according to claim 1, characterized in that: The tube expansion device includes a first working end and a second working end spaced apart at both ends of the tube blank along the first direction, and a tube pressure driving mechanism for driving the first working end and the second working end to move closer and further apart from each other. At least one of the first working end and the second working end is provided with a pressurization channel connected to an external high-pressure tube expansion medium source.

3. The corrugated pipe forming equipment according to claim 1, characterized in that: The molding drive mechanism includes an outer mold component and a variable pitch drive component. The outer mold component includes a plurality of outer mold pieces arranged sequentially along the first direction. The plurality of outer mold pieces are connected one-to-one with the molding mold pieces. Adjacent outer mold pieces are movably connected to each other so that the distance between two adjacent molding mold pieces in the first direction does not exceed a preset first distance value. The variable pitch drive component is used to drive two outer mold pieces located at both ends of the first direction to move relative to each other along the first direction.

4. The corrugated pipe forming equipment according to claim 3, characterized in that: Each of the two adjacent outer mold pieces is provided with connecting holes aligned with each other along the first direction. A connector is inserted through the two aligned connecting holes. The connector is provided with limiting portions at both ends in the first direction. The two connecting holes are located between the two limiting portions.

5. The corrugated pipe forming equipment according to claim 3, characterized in that: The outer mold plate has an outer mold hole that extends through the first direction. The forming mold plate is disposed in the outer mold hole. The inner side of the outer mold hole has a slot that extends circumferentially. The outer periphery of the forming mold plate has a snap-fit ​​part that corresponds to the slot. The snap-fit ​​part can be detachably embedded in the slot.

6. The corrugated pipe forming equipment according to claim 5, characterized in that: The plurality of slots are arranged at intervals around the inner side of the outer mold hole, and a clearance space is provided between two adjacent slots for the snap-fit ​​portion to pass through in the first direction. The molding die device also includes a rotary drive mechanism for driving the molding die component and the outer mold component to rotate relative to each other.

7. The corrugated pipe forming equipment according to claim 6, characterized in that: The outer mold plate includes a first piece, a second piece, and a third piece arranged in sequence along the first direction, and the inner edges of the first piece, the second piece, and the third piece form the slot.

8. The corrugated pipe forming equipment according to claim 1, characterized in that: The corrugated pipe forming equipment includes a base frame and a lifting plate. The forming drive mechanism includes a lifting drive component, which drives the lifting plate to move relative to the base frame along the first direction. The forming mold component and the outer mold component are respectively connected to the base frame and the lifting plate.

9. The corrugated pipe forming equipment according to claim 1, characterized in that: The inner side of the forming hole is provided with a forming part, and the forming groove is provided between the forming parts of two adjacent forming mold pieces.

10. The corrugated pipe forming equipment according to claim 1, characterized in that: The opening and closing drive mechanism includes an opening and closing base and an opening and closing drive component. The opening and closing base includes a plurality of opening and closing transmission blocks that correspond one-to-one with the sub-pieces. The opening and closing transmission blocks are provided with mold opening and closing guide posts extending along the first direction. The sub-pieces have opening and closing guide holes sleeved on the mold opening and closing guide posts. The opening and closing drive component is used to drive the plurality of opening and closing transmission blocks to move radially along the forming hole.

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