Engineering plastic pipe flaring device

Abstract

The invention discloses an engineering plastic pipe flaring device which comprises a limiting sleeve, an expansion mechanism, a transmission mechanism and an ejection mechanism, the expansion mechanism is connected with the transmission mechanism, the expansion mechanism comprises a rotating disc, a plurality of cranks and a plurality of rotating rollers, the rotating rollers are rotationally arranged in horizontal sections of the cranks, and the limiting sleeve is connected with the transmission mechanism. A first spring is arranged on the end surface of one side of the vertical section of the crank; the transmission mechanism comprises a moving shaft and a driving shaft, a driving wheel is arranged on the surface of the moving shaft, and the inserting rod is inserted into the inserting groove; the ejection mechanism comprises a rail, the rail comprises a stagnation section and a driving section, and the driving section is meshed with the surface threads of the driving wheel. The expanding section can be extruded in the pipeline flaring process, so that the variable-diameter section perpendicular to the straight section is formed, the problem that a horn-shaped gap exists between the flaring section and the connecting position of a subsequent pipeline is solved, smoothness of the pipeline connecting position is kept, and the air clog phenomenon is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe forming, in particular to an engineering plastic pipe expanding device. Background Art

[0002] Engineering plastic pipes are pipes made of high-performance engineering plastics such as polyamide, polycarbonate, and polyoxymethylene. They have significant and superior comprehensive performance in mechanical strength, heat resistance, corrosion resistance, dimensional stability, and wear resistance, and can meet the actual harsh application environment and needs.

[0003] In the actual application of engineering plastic pipes, pipe connections are usually involved. Conventional connection methods include connector docking, welding and socket connection. When using socket connection pipes, the pipe ports need to be expanded to increase the diameter of the pipe ports so that the pipes to be connected can be smoothly inserted into the ports to form a continuous internal channel of the pipe.

[0004] In the prior art, a Chinese patent, publication number: CN218315205U, discloses a plastic pipe flaring device. The specification discloses in paragraph

[0021] that a conical reaming head 9 is fixedly mounted on the outer wall of the connecting plate on the side away from the electric push rod 8. The conical reaming head 9 is driven to move to the left by the extension of the output shaft of the electric push rod 8 to flare the plastic pipe.

[0005] Combined with the means disclosed in the above-mentioned prior art, when a conical reaming head is used for pipe expansion, a trumpet-shaped pipe opening is often produced. Secondly, in order to prevent the pipe port from being broken due to rapid expansion, the existing pipe expansion operation usually adopts a conical part for extrusion and expansion. However, after extrusion and expansion, the pipe port usually forms an open trumpet shape. When the subsequent pipe is connected, not only the trumpet-shaped port cannot fit well with the socket pipe end, resulting in poor sealing of the pipe socket connection; but also a part of the trumpet-shaped pipe wall will remain between the diameter reducing section and the end face of the socket pipe produced by the pipe expansion, which affects the smoothness of the internal channel of the pipe on the one hand, and on the other hand, when the medium transmitted in the pipe completely covers the internal channel of the pipe, the bubbles in the transmission medium will produce air pockets at the trumpet-shaped diameter reducing section. If the pipe is connected to the inlet of the water pump, the pipe bubbles at the air pocket will hit the impeller of the water pump with the water flow, which will cause cavitation and damage the water pump blades. Summary of the Invention

[0006] The object of the present invention is to provide an engineering plastic pipe expanding device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: an engineering plastic pipe expanding device, comprising a limiting sleeve, an expansion mechanism, a transmission mechanism and an ejection mechanism, wherein the expansion mechanism is connected to the transmission mechanism, and one end of the transmission mechanism is connected to a power mechanism for driving the transmission mechanism to rotate;

[0008] The limiting sleeve includes an expansion section, and the surface of the expansion section is parallel to the end surface of the limiting sleeve;

[0009] The expansion mechanism includes a turntable, a plurality of cranks and a plurality of rollers. The turntable surface is provided with a plurality of mounting seats. The corners of the cranks are rotatably arranged inside the mounting seats. The rollers are rotatably arranged in the horizontal section of the crank. A first spring is provided on one end surface of the vertical section of the crank.

[0010] The transmission mechanism includes a moving shaft and a driving shaft. The surface of the moving shaft is provided with a driving wheel, and a slot is opened inside the moving shaft. An insertion rod is provided at one end of the driving shaft, and the insertion rod is inserted into the slot.

[0011] The ejection mechanism includes a track, and the track includes a stagnation section and a driving section. The driving section is engaged with a thread on the surface of the driving wheel, and the length of the stagnation section is greater than the length of the driving wheel.

[0012] Preferably, the limiting sleeve further includes a positioning section and a limiting section, the expansion section is located between the positioning section and the limiting section, and the inner wall diameter of the limiting section is larger than the inner wall diameter of the positioning section.

[0013] Preferably, the length of the roller is greater than the length of the horizontal section of the crank, and the width of the vertical section of the crank is greater than the inner width of the mounting seat;

[0014] The length of the rotating roller is smaller than the length of the inner wall of the limiting section.

[0015] Preferably, the slot has the same cross-section as the insertion rod, and the inner wall size of the slot is larger than the outer wall size of the insertion rod.

[0016] Preferably, the ejection mechanism further comprises two side frames and a second spring, wherein the side frames are slidably sleeved on the surfaces of the movable shaft and the driving shaft respectively;

[0017] The second spring is located between the side frame and the driving wheel, and the second spring is sleeved on the outside of the moving shaft.

[0018] Preferably, a mounting groove is provided under each of the side frames, and both ends of the rail are respectively located inside the mounting groove;

[0019] A jacking bolt is provided inside the bottom end of each side frame, and a threaded section of the jacking bolt is engaged with the inside of the bottom end of the side frame. One end of the jacking bolt passes through the mounting groove and contacts the lower surface of the track.

[0020] Preferably, the power mechanism includes a reduction gearbox and a motor, the power output end of the motor is connected to the input end of the reduction gearbox, and the power output end of the reduction gearbox is connected to the drive shaft.

[0021] Preferably, it further comprises an equipment rack, wherein the equipment rack is arranged below the transmission mechanism and the ejection mechanism;

[0022] The equipment rack includes a slide rail, a slide groove and a positioning roller, wherein the slide rails are respectively arranged on the inner side of the equipment rack and located below the ejection mechanism;

[0023] The sliding grooves are respectively opened on one side surface of the equipment rack and are located below the limiting sleeve;

[0024] The positioning rollers are symmetrically arranged on an inner wall of one side of the equipment frame and are located at the entrance of the limiting sleeve.

[0025] Preferably, the limiting sleeve further includes a first bolt, and the first bolt is respectively provided on both sides of one end of the limiting sleeve;

[0026] The first bolt passes through the outer wall of one end of the sliding slot and is sleeved with a nut.

[0027] Preferably, the ejection mechanism further includes a second bolt, and the second bolt is respectively provided on both sides of the side frame;

[0028] The second bolt passes through the outer wall of one end of the slide rail and is sleeved with a nut.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention achieves the effect of limiting the outer wall of the flared section by setting a limit sleeve. The limit sleeve limits the outer wall of the flared section, keeps the size of the flared section in line with expectations, and prevents the pipe port from over-expanding and causing an opening, thereby ensuring the quality of the pipe flaring.

[0031] 2. The present invention provides an expansion section and a crank to avoid the formation of a trumpet-shaped diameter-reducing section. By squeezing the vertical section of the crank through the end face of the limiting sleeve, the distribution pattern of the rollers can be adjusted so that the rollers gradually tend to a horizontal state. In conjunction with the rotation of the expansion mechanism, the trumpet-shaped diameter-reducing section can be gradually expanded into a straight pipe section, and the expansion section restricts the outer wall of the pipe so that the diameter-reducing section of the pipe fits the inner wall of the expansion section, forming a ninety-degree angle between the diameter-reducing section and the inner wall of the pipe. After the pipe is connected by socket, there is no diameter-reducing section at the pipe connection, thereby maintaining the smoothness of transmission and preventing the occurrence of air pockets.

[0032] 3. The present invention achieves the effect of driving the expansion mechanism to extrude the variable diameter section of the pipe by setting an ejection mechanism. The ejection mechanism can drive the expansion mechanism forward while the transmission mechanism rotates, and the roller is pressed against the variable diameter section, so that the variable diameter section fits the expansion section to form a ninety-degree angle, ensuring that the trumpet-shaped shape of the deformed section is eliminated, and further ensuring the effect of pipe expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the side view of the appearance of the present invention;

[0035] Figure 3 This is a schematic diagram of the appearance structure of the expansion mechanism of the present invention;

[0036] Figure 4 This is a schematic diagram of the position structure of the limiting sleeve and the expansion mechanism of the present invention;

[0037] Figure 5 This is a schematic cross-sectional view of the combination of the limiting sleeve and the expansion mechanism of the present invention;

[0038] Figure 6 For the present invention Figure 5 A schematic diagram of the structure at center A;

[0039] Figure 7 It is a schematic diagram of the transmission connection structure between the transmission mechanism and the ejection structure of the present invention;

[0040] Figure 8 It is a schematic cross-sectional structural diagram of the transmission mechanism of the present invention;

[0041] Figure 9 This is a schematic diagram of the end surface structure of the movable shaft of the present invention;

[0042] Figure 10 This is a schematic diagram of the appearance structure of the ejection mechanism of the present invention;

[0043] Figure 11 It is a schematic side view of the ejection mechanism of the present invention;

[0044] Figure 12 It is a schematic diagram of the top structure of the present invention.

[0045] In the picture:

[0046] 100, limiting sleeve; 101, positioning section; 102, expansion section; 103, limiting section; 110, first bolt;

[0047] 200, expansion mechanism; 210, turntable; 211, mounting seat; 220, crank; 221, first spring; 230, roller;

[0048] 300, transmission mechanism; 310, moving shaft; 311, driving wheel; 312, slot; 320, driving shaft; 321, insertion rod;

[0049] 400, ejection mechanism; 410, side frame; 411, mounting slot; 412, jacking bolt; 420, second spring; 430, track; 431, stagnation section; 432, driving section; 440, second bolt;

[0050] 500, power mechanism; 510, reduction gearbox; 520, motor;

[0051] 600, equipment rack; 610, slide rail; 620, slide chute; 630, positioning roller;

[0052] 700, pipe body; 701, end face of reducing section; 702, flaring section. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] See also Figures 1 to 12 , the present invention provides the following two embodiments:

[0055] Example 1:

[0056] See also Figure 1 and Figure 2A device for expanding an engineering plastic pipe comprises a limiting sleeve 100, an expansion mechanism 200, a transmission mechanism 300, and an ejection mechanism 400. The limiting sleeve 100 is designed to be attached to the outside of the pipe body 700 to be expanded, limiting the size of the expansion. The expansion mechanism 200 is connected to the transmission mechanism 300, and one end of the transmission mechanism 300 is connected to a power mechanism 500 that drives the transmission mechanism 300 to rotate. The transmission mechanism 300 is used to transmit power output by the power mechanism 500 to the expansion mechanism 200, causing the expansion mechanism 200 to rotate and expand the opening of the heated pipe body 700.

[0057] See also Figure 1 and Figure 2 The power mechanism 500 includes a reduction gearbox 510 and a motor 520 . The power output end of the motor 520 is connected to the input end of the reduction gearbox 510 , and the power output end of the reduction gearbox 510 is connected to the drive shaft 320 .

[0058] The motor 520 and the reduction gearbox 510 are both mature existing technologies, and their working principles and transmission connection relationships are well known to those skilled in the art, so they will not be elaborated here.

[0059] See also Figure 4 and Figure 5 The limiting sleeve 100 includes a positioning section 101, an expansion section 102 and a limiting section 103. The surface of the expansion section 102 is parallel to the end face of the limiting sleeve 100. The expansion section 102 is located between the positioning section 101 and the limiting section 103, and the inner wall diameter of the limiting section 103 is larger than the inner wall diameter of the positioning section 101.

[0060] It is worth noting that when the required inner wall diameter of the flared section 702 is the outer wall diameter of the straight pipe section of the pipe body 700, the inner wall radius of the limiting section 103 is the sum of the outer wall radius of the pipe body 700 plus the pipe wall thickness, which is used to limit the inner wall of the flared section 702 to be able to socket pipe bodies 700 of the same specifications, and the inner diameters of the inner walls of the socketed pipe bodies 700 are the same, providing a continuous and smooth transmission channel.

[0061] Secondly, the length of the limiting section 103 and the inner wall diameter of the limiting section 103 can be flexibly adjusted according to actual application conditions. The staff can select the size of the limiting sleeve 100 according to their working habits and commonly used flaring sizes.

[0062] See also Figures 3 to 6The expansion mechanism 200 includes a turntable 210, multiple cranks 220 and multiple rollers 230. Multiple mounting seats 211 are provided on the surface of the turntable 210. The corners of the cranks 220 are all rotatably set inside the mounting seats 211. The rollers 230 are rotatably set in the horizontal section of the crank 220. A first spring 221 is provided on one end face of the vertical section of the crank 220. The first spring 221 is used to apply elastic force to the vertical section of the crank 220, and the elastic force pushes the crank 220 to rotate along the rotating connection with the mounting seat 211, so that the rollers 230 are inclined, which is convenient for slowly expanding the inner wall of the pipe body 700.

[0063] Secondly, the length of the roller 230 is greater than the horizontal section length of the crank 220 , the vertical section width of the crank 220 is greater than the internal width of the mounting seat 211 , and the length of the roller 230 is less than the length of the inner wall of the limiting section 103 .

[0064] Specifically, the first spring 221 tilts the roller 230 through elastic force, and the expansion mechanism 200 gradually moves toward the limiting sleeve 100. The surface of the roller 230 gradually contacts the inner wall of the opening of the pipe body 700. As the expansion mechanism 200 advances, the end face of the limiting sleeve 100 contacts the vertical section of the crank 220 and squeezes the first spring 221, so that the roller 230 forms a horizontal shape. With the continuous rotation of the expansion mechanism 200, the flared section 702 of the pipe body 700 can be formed into a straight pipe section.

[0065] It is worth noting that when the rollers 230 are in a horizontal state, the diameter of the tracks formed by the rotation of the outer walls of the multiple rollers 230 is the same as the diameter of the opening of the pipe body 700 after the expansion is expected.

[0066] See also Figure 7 and Figure 8 The transmission mechanism 300 includes a moving shaft 310 and a driving shaft 320. A driving wheel 311 is provided on the surface of the moving shaft 310, and a slot 312 is opened inside the moving shaft 310. An insertion rod 321 is provided at one end of the driving shaft 320, and the insertion rod 321 is inserted into the slot 312.

[0067] See also Figure 9 The slot 312 has the same cross-section as the insertion rod 321 , and the inner wall size of the slot 312 is larger than the outer wall size of the insertion rod 321 .

[0068] The insertion rod 321 is combined with the slot 312 to ensure that the driving shaft 320 can drive the movable shaft 310 to rotate while not affecting the ability of the movable shaft 310 to move forward and backward.

[0069] See also Figure 7 、 Figure 10 and Figure 11The ejection mechanism 400 includes a track 430 , which includes a stagnation section 431 and a driving section 432 . The driving section 432 is engaged with a thread on the surface of the driving wheel 311 . The length of the stagnation section 431 is greater than that of the driving wheel 311 .

[0070] The ejection mechanism 400 also includes two side frames 410 and a second spring 420. The side frames 410 are slidably connected to the surfaces of the movable shaft 310 and the driving shaft 320 respectively. The second spring 420 is located between the side frames 410 and the driving wheel 311, and the second spring 420 is connected to the outside of the movable shaft 310. Linear ball bushings are provided at the connection points between the side frames 410 and the transmission mechanism 300 to maintain smooth rotation of the transmission mechanism 300.

[0071] A mounting slot 411 is defined below each of the side frames 410 , and both ends of the rail 430 are located inside the mounting slot 411 .

[0072] A jacking bolt 412 is provided inside the bottom end of the side frame 410, and the threaded section of the jacking bolt 412 is engaged with the inside of the bottom end of the side frame 410. One end of the jacking bolt 412 passes through the installation slot 411 and contacts the lower surface of the track 430.

[0073] Lifting bolts 412 secure rail 430. During actual use, operators can flexibly adjust the installation position of rail 430 to fine-tune the meshing position between rail 430 and drive wheel 311, thereby fine-tuning the axial displacement of drive wheel 311. By loosening lifting bolts 412 and separating the drive section 432 from the threads on the drive wheel 311, the position of rail 430 can be adjusted.

[0074] Specifically, during actual use, the reduction box 510 reduces the output speed of the motor 520 to drive the driving shaft 320 to rotate, and drives the moving shaft 310 to rotate through the positional relationship between the insertion rod 321 and the slot 312.

[0075] After the movable shaft 310 rotates, through the meshing relationship between the driving wheel 311 and the driving section 432, the driving wheel 311 is screwed in along the thread on the surface of the driving section 432, so that the movable shaft 310 pushes the expansion mechanism 200 toward the limit sleeve 100, and in this process, the movable shaft 310 also synchronously drives the expansion mechanism 200 to rotate.

[0076] Prior to this, the worker placed the pipe to be expanded within the limiting sleeve 100, ensuring that the outer wall of the pipe body 700 was in stable contact with the inner wall of the positioning section 101. The portion of the pipe body 700 to be expanded was then heated to facilitate the expansion process. Subsequently, the end face of the pipe body 700 was aligned with the end face of the limiting section 103, and the pipe body 700 was secured.

[0077] The first spring 221 pushes the crank 220 to rotate through elastic force, so that the roller 230 is in an inclined state. As the expansion mechanism 200 continues to approach the limit sleeve 100, the rotating roller 230 approaches the port of the pipe body 700 until the rotation expands the port of the pipe body 700.

[0078] During the expansion process, the driving wheel 311 continuously engages along the surface of the driving section 432 and moves until the driving wheel 311 moves into the stagnant section 431. At this time, the movable shaft 310 only rotates and does not generate displacement, that is, the end face of the limiting section 103 squeezes the vertical section of the crank 220 and adjusts the roller 230 to a horizontal state. With the continuous rotation of the expansion mechanism 200, the expansion section 702 of the heated and softened pipe body 700 can be fitted into the inner wall of the limiting section 103, and the roller 230 continuously squeezes the end face 701 of the reducing section, so that the end face 701 of the reducing section fits into the expansion section 102, forming a state where the angle between the end face 701 of the reducing section and the straight pipe section of the pipe body 700 is ninety degrees.

[0079] After the expansion, the pipe body 700 forms an expansion section 702 that meets the size, and the inner wall diameter of the expansion section 702 is the outer wall diameter of the straight pipe section of the pipe body 700. Secondly, the angle between the end face 701 of the reducing section and the expansion section 702 is ninety degrees.

[0080] In the subsequent socket connection process, the pipe body 700 of the same specification can be directly socketed into the flared section 702. The flared section 702 has a higher degree of fit with the outer wall of the pipe body 700, and the end face 701 of the reducing section is parallel to the end face of the socket pipe and can completely match each other, so that the flow channel between the inner wall of the socket pipe and the inner wall of the pipe body 700 has no drop section, forming a continuous and smooth transmission channel, eliminating the trumpet-shaped reducing section that is easily left in traditional flaring operations.

[0081] After waiting for the pipe body 700 to cool down and harden, the motor 520 rotates in the opposite direction, driving the transmission mechanism 300 to reverse. The second spring 420 pushes the driving wheel 311 toward the driving section 432 through elastic force, so that when the driving wheel 311 rotates in the opposite direction, it can smoothly enter the thread of the driving section 432 under the push of the second spring 420. As the transmission mechanism 300 continues to reverse, the driving wheel 311 drives the movable shaft 310 to reset, so that the expansion mechanism 200 is disengaged from the interior of the limit sleeve 100, and the expansion operation of the pipe body 700 is completed. The limit sleeve 100 is removed, and the pipe body 700 is removed from the limit sleeve 100. The limit sleeve 100 is installed again, and the subsequent expansion operation of the pipe body 700 can be carried out.

[0082] Example 2:

[0083] Based on the content of the above embodiment 1, another embodiment is proposed again:

[0084] See also Figure 1 、 Figure 2 and Figure 12 , an engineering plastic pipe expanding device, further comprising an equipment rack 600, which is arranged below the transmission mechanism 300 and the ejection mechanism 400.

[0085] The equipment rack 600 includes a slide rail 610 , a slide groove 620 and positioning rollers 630 .

[0086] See also Figure 1 、 Figure 2 and Figure 12 The slide rails 610 are respectively arranged on the inner side of the equipment frame 600 and are located below the ejection mechanism 400. The ejection mechanism 400 also includes a second bolt 440, which is respectively arranged on both sides of the side frame 410. The second bolt 440 passes through the outer wall of one end of the slide rail 610 and is sleeved with a nut.

[0087] Specifically, the staff can flexibly adjust the position of the ejection mechanism 400 according to actual use needs, thereby achieving the effect of adjusting the ejection distance of the expansion mechanism 200.

[0088] See also Figure 1 、 Figure 2 and Figure 12 The slide grooves 620 are respectively opened on one side surface of the equipment rack 600 and are located below the limiting sleeve 100. The limiting sleeve 100 also includes a first bolt 110. The first bolt 110 is respectively arranged on both sides of one end of the limiting sleeve 100. The first bolt 110 passes through the outer wall of one end of the slide groove 620 and is sleeved with a nut.

[0089] Specifically, the staff can flexibly adjust the position of the limiting sleeve 100 according to actual use needs, so as to match the ejection distance of the expansion mechanism 200 and the length of the expansion tube section.

[0090] The positioning rollers 630 are symmetrically arranged on the inner wall of one side of the equipment frame 600 and are located at the entrance of the limiting sleeve 100 . The positioning rollers 630 are used to fit the outer wall of the pipe body 700 to support the pipe body 700 .

[0091] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An engineering plastic pipe expansion device, characterized by: It comprises a limiting sleeve (100), an expansion mechanism (200), a transmission mechanism (300) and an ejection mechanism (400), wherein the expansion mechanism (200) is connected to the transmission mechanism (300), and one end of the transmission mechanism (300) is connected to a power mechanism (500) for driving the transmission mechanism (300) to rotate. The limiting sleeve (100) comprises an expansion section (102), and the surface of the expansion section (102) is parallel to the end surface of the limiting sleeve (100); The expansion mechanism (200) comprises a rotating disk (210), a plurality of cranks (220) and a plurality of rollers (230); a plurality of mounting seats (211) are provided on the surface of the rotating disk (210); the corners of the cranks (220) are all rotatably arranged inside the mounting seats (211); the rollers (230) are rotatably arranged in the horizontal section of the cranks (220); and a first spring (221) is provided on one end surface of the vertical section of the cranks (220); The transmission mechanism (300) comprises a movable shaft (310) and a driving shaft (320); a driving wheel (311) is provided on the surface of the movable shaft (310); a slot (312) is provided inside the movable shaft (310); an insertion rod (321) is provided at one end of the driving shaft (320); the insertion rod (321) is inserted into the slot (312); The ejection mechanism (400) includes a track (430), the track (430) includes a stagnant section (431) and a driving section (432), the driving section (432) is engaged with a thread on the surface of the driving wheel (311), and the length of the stagnant section (431) is greater than the length of the driving wheel (311).

2. The engineering plastic pipe expanding device according to claim 1, characterized in that: The limiting sleeve (100) further comprises a positioning section (101) and a limiting section (103); the expansion section (102) is located between the positioning section (101) and the limiting section (103); and the inner wall diameter of the limiting section (103) is larger than the inner wall diameter of the positioning section (101).

3. The engineering plastic pipe expanding device according to claim 2, characterized in that: The length of the rotating roller (230) is greater than the length of the horizontal section of the crank (220), and the width of the vertical section of the crank (220) is greater than the inner width of the mounting seat (211); The length of the rotating roller (230) is smaller than the length of the inner wall of the limiting section (103).

4. The engineering plastic pipe expanding device according to claim 1, characterized in that: The slot (312) has the same cross-section as the insertion rod (321), and the inner wall size of the slot (312) is larger than the outer wall size of the insertion rod (321).

5. The engineering plastic pipe expanding device according to claim 1, characterized in that: The ejection mechanism (400) further includes two side frames (410) and a second spring (420), wherein the side frames (410) are respectively slidably sleeved on the surfaces of the movable shaft (310) and the driving shaft (320); The second spring (420) is located between the side frame (410) and the driving wheel (311), and the second spring (420) is sleeved on the outside of the moving shaft (310).

6. The engineering plastic pipe expanding device according to claim 5, characterized in that: A mounting groove (411) is provided below each of the side frames (410), and both ends of the track (430) are located inside the mounting groove (411). A lifting bolt (412) is provided inside the bottom end of each side frame (410), and a threaded section of the lifting bolt (412) is engaged with the inside of the bottom end of the side frame (410). One end of the lifting bolt (412) passes through the mounting groove (411) and contacts the lower surface of the track (430).

7. The engineering plastic pipe expanding device according to claim 1, characterized in that: The power mechanism (500) comprises a reduction box (510) and a motor (520), wherein the power output end of the motor (520) is connected to the input end of the reduction box (510), and the power output end of the reduction box (510) is connected to the drive shaft (320).

8. The engineering plastic pipe expanding device according to any one of claims 1 to 7, characterized in that: It also includes an equipment rack (600), and the equipment rack (600) is arranged below the transmission mechanism (300) and the ejection mechanism (400); The equipment rack (600) includes a slide rail (610), a slide groove (620) and a positioning roller (630), wherein the slide rail (610) is respectively arranged on the inner side of the equipment rack (600) and is located below the ejection mechanism (400); The sliding grooves (620) are respectively opened on a side surface of the equipment rack (600) and are located below the limiting sleeve (100); The positioning roller (630) is symmetrically arranged on an inner wall of one side of the equipment frame (600) and is located at the entrance of the limiting sleeve (100).

9. The engineering plastic pipe expanding device according to claim 8, characterized in that: The limiting sleeve (100) further includes a first bolt (110), and the first bolt (110) is respectively arranged on both sides of one end of the limiting sleeve (100); The first bolt (110) passes through the outer wall of one end of the sliding groove (620) and is sleeved with a nut.

10. The engineering plastic pipe expanding device according to claim 8, characterized in that: The ejection mechanism (400) further includes a second bolt (440), and the second bolt (440) is respectively arranged on both sides of the side frame (410); The second bolt (440) passes through the outer wall of one end of the slide rail (610) and is sleeved with a nut.

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