Feeding device for plastic pipeline production

Abstract

The utility model discloses a feeding device for plastic pipeline production. The feeding device comprises a fixing base, an annular support, a translation driving assembly, a pressing assembly and a guiding assembly. The translation driving assembly adopts a tooth-shaped synchronous belt with rhombic anti-skid protrusions on the surface, the tooth-shaped synchronous belt is meshed with the outer surface of the pipeline for driving, and the friction coefficient is increased to 0.45. The pressing assembly dynamically adjusts the pre-tightening force of an elastic connecting rod through a hydraulic oil cylinder, the pressing assembly is matched with the pipe diameter of DN200-DN1200, and the pressure fluctuation is smaller than or equal to + / -5%. And a rotating cam of the guide assembly and the laminated disc spring work together to automatically compensate the straightness deviation of + / -3mm. According to the device, through the collaborative design of meshing driving, dynamic pressing and self-deviation-correcting guiding, the problems of slipping, pressing failure and snake-shaped swinging of a traditional feeding device are solved, and the device is suitable for pipelines made of various materials such as PVC and HDPE.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe injection molding production, and in particular to a feeding device for plastic pipe production. Background Technology

[0002] In the extrusion molding process of PVC pipes, the feeding device is the core equipment connecting the extruder and the cooling and shaping system, and its performance directly affects the dimensional accuracy, surface quality, and production efficiency of the pipe. However, in existing technologies, traditional feeding devices mostly use belt pulleys or roller friction drive methods, which have the following drawbacks:

[0003] 1. Insufficient driving friction: Slippage easily occurs when the smooth belt contacts the pipe surface, leading to fluctuations in feed speed, especially with poor driving effect on large-diameter or wet plastic pipes; 2. Lagging clamping force adjustment: The mechanical spring clamping mechanism is difficult to respond to changes in pipe diameter in real time, which can easily cause local overpressure or clamping failure; 3. Uneven contact pressure between the synchronous belt and the pipe leads to slippage and feed speed fluctuations (±5% or more); 4. Weak guiding and correction ability: Fixed guide wheels cannot automatically compensate for pipe straightness deviations, which can easily cause pipe serpentine swaying. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a feeding device for the production of plastic pipes.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a feeding device for producing plastic pipes, comprising a fixed base, an annular support above the fixed base, at least three translation drive components and clamping components evenly distributed along the circumference inside the annular support, and a guide component fixed on one side of the annular support; the translation drive component includes a toothed synchronous belt that meshes with the outer surface of the plastic pipe, and the outer surface of the toothed synchronous belt has staggered diamond-shaped anti-slip protrusions; the clamping component includes a hinged support structure linked by an elastic connecting rod and a hydraulic cylinder, the hydraulic cylinder responding to changes in the pipe diameter and controlling the preload of the elastic connecting rod through slider displacement; the guide component includes symmetrically arranged rotating cams, a return spring sleeved on the cam shaft, and a roller plunger in contact with the pipe surface.

[0007] As a preferred technical solution of this utility model, the driving mechanism of the translation drive assembly includes a drive wheel and a driven wheel connected to both ends of the inner wall of the toothed synchronous belt. The drive wheel is driven by a geared motor. The shafts of the drive wheel and the driven wheel are fixed on the wheel mounting plate. The wheel mounting plate is provided with an arc-shaped adjustment groove. The shaft of the drive wheel can be moved radially outward along the groove to increase the wrap angle of the toothed synchronous belt.

[0008] As a preferred embodiment of this utility model, the hinged support structure includes two parallel support rods, with both ends hinged to the annular bracket and the rotating wheel mounting plate, respectively. The line connecting the hinge points of the two support rods forms an angle of 15-30° with the pipeline axis. One end of the elastic connecting rod is hinged to the rotating wheel mounting plate, and the other end is slidably connected to the groove of the annular bracket through a slider. The slider is driven by a hydraulic cylinder.

[0009] As a preferred embodiment of this utility model, the reset spring is a pre-tightened laminated disc spring, and the roller surface of the roller plunger is covered with an elastic wear-resistant material.

[0010] As a preferred technical solution of this utility model, the outer surface of the toothed synchronous belt is provided with anti-slip texture, and the contact pressure between the belt and the plastic pipe is dynamically adjusted by a hydraulic cylinder.

[0011] As a preferred embodiment of this utility model, the guide bracket of the guide assembly is provided with an angle adjustment bolt for adjusting the initial deflection angle of the rotating cam.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The toothed synchronous belt meshes with the pipe surface for drive, and the diamond-shaped anti-slip protrusions on the surface increase the effective contact friction by more than 30%, completely eliminating slippage; the drive wheel shaft can be moved outward along the arc-shaped adjustment groove, and the wrap angle of the toothed synchronous belt is increased to 120°-150°, improving the efficiency of drive torque transmission.

[0014] 2. The hydraulic cylinder dynamically adjusts the preload of the elastic connecting rod through the displacement of the slider, so as to achieve real-time matching between the clamping force and the change of pipe diameter, and the pressure fluctuation range is controlled within ±5%.

[0015] 3. The rotating cam and the return spring work together to keep the roller plunger in contact with the pipe surface and automatically compensate for straightness deviation within ±3mm; the angle adjustment bolt supports the initial angle fine adjustment of the guide assembly to adapt to pipe materials with different hardness; the modular ring bracket design can be expanded to install 4-8 sets of drive / clamping units, and a single unit can adapt to pipe diameter range of DN50-DN1200. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2This is the front view of this utility model;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 This is a cross-sectional structural diagram of the present invention;

[0021] In the diagram: 1. Fixed base; 2. Annular bracket; 3. Translation drive assembly; 4. Clamping assembly; 5. Guide assembly; 31. Toothed synchronous belt; 32. Drive wheel; 33. Driven wheel; 34. Gear motor; 35. Rotary wheel mounting plate; 41. Support rod; 42. Elastic connecting rod; 43. Slider; 44. Hydraulic cylinder; 51. Guide bracket; 52. Rotary cam; 53. Return spring; 54. Roller plunger. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] In the attached diagram, all identical reference numerals refer to the same components.

[0024] Example 1: As Figure 1-4 As shown, this utility model provides a feeding device for plastic pipe production. The feeding device in this embodiment includes the following core components:

[0025] Fixed base 1 and ring bracket 2: Fixed base 1 is a welded steel base, and the top is connected to ring bracket 2 through a flange; ring bracket 2 adopts a split aluminum alloy frame with an inner diameter of 800mm, and 6 sets of translation drive components 3 and clamping components 4 are evenly distributed around the circumference.

[0026] Translation drive assembly 3: The toothed synchronous belt 31 is made of polyurethane with diamond-shaped anti-slip protrusions molded on the surface (protrusion height 0.8mm, spacing 3mm); the drive wheel 32 and the driven wheel 33 are fixed by the wheel mounting plate 35. The drive wheel 32 is driven by the geared motor 34 (rated power 2.2kW); the wheel mounting plate 35 is provided with an arc-shaped adjustment groove, and the axis of the drive wheel 32 can be moved outward along the groove by 50mm, so that the wrap angle of the toothed synchronous belt 31 increases from 120° to 150°.

[0027] Clamping assembly 4: Two parallel support rods 41 (made of 40Cr alloy steel) are hinged to the annular bracket 2 and the rotating wheel mounting plate 35, and the line connecting the hinge points forms a 20° angle with the pipeline axis; one end of the elastic connecting rod 42 is hinged to the rotating wheel mounting plate 35, and the other end is connected to the dovetail groove slide rail of the annular bracket 2 through the slider 43. The slider 43 is pushed by the hydraulic cylinder 44, the cylinder stroke is 80mm, and the output pressure is adjustable from 0-10MPa.

[0028] Guide assembly 5: The rotating shaft of the rotary cam 52 is equipped with a return spring 53 (pre-tightened laminated disc spring, stiffness coefficient 500N / mm); the roller of the roller plunger 54 is covered with a polyurethane-silicon carbide wear-resistant layer, and the contact width with the pipe surface is 30mm; the guide bracket 51 is equipped with an angle adjustment bolt with an adjustment accuracy of 1°, which is used to set the initial deflection angle of the cam 52 (range ±15°).

[0029] The method of using this utility model is as follows:

[0030] 1. Start the geared motor 34 to drive the toothed synchronous belt 31 to rotate, pushing the plastic pipe axially forward;

[0031] 2. The hydraulic cylinder 44 automatically adjusts the position of the slider 43 according to the pipe diameter (e.g., DN400) so that the elastic connecting rod 42 generates an appropriate preload.

[0032] 3. The roller plunger 54 is in contact with the pipe surface under the action of the return spring 53, and the rotating cam 52 compensates for the straightness deviation in real time.

[0033] Example 2: The difference from Example 1 is as follows:

[0034] The inner diameter of the ring bracket 2 is expanded to 1200mm, and 8 sets of translation drive components 3 are evenly distributed around the circumference;

[0035] The anti-slip protrusion height of the toothed synchronous belt 31 has been increased to 1.2mm, making it suitable for large-diameter (DN1200) pipelines; the hydraulic cylinder 44 has been replaced with a servo electric cylinder, improving the pressure control accuracy to ±2%.

[0036] Test data from Example 1 show that the friction coefficient of the toothed synchronous belt 31 is increased from 0.3 for the traditional flat belt to 0.45, and the feed speed fluctuation rate is ≤1%; the adjustment time of the hydraulic cylinder 44 in response to pipe diameter changes (DN200-DN800) is ≤2 seconds, and the pressure fluctuation is ≤±5%; the guide component 5 can automatically correct the pipe straightness deviation of ±3mm, and the finished product ellipticity error is <0.5%.

[0037] This invention relates to a feeding device for plastic pipe production, achieving high-precision feeding control across the entire range of plastic pipes from small and medium diameters to large diameters. Both embodiments share the core technologies of "meshing drive - dynamic clamping - self-correcting guidance," and through structural parameter optimization (such as the size of the annular support, the height of the toothed synchronous belt protrusion, and the drive control method), they are adapted to different production scenarios, comprehensively improving efficiency by more than 30%, providing a reliable solution for continuous plastic pipe production.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A feeding device for plastic pipe production, comprising a fixed seat (1), characterized in that, The fixed seat (1) is provided with an annular support (2) above, and at least three translation driving assemblies (3) and pressing assemblies (4) are uniformly distributed in the circumferential direction in the annular support (2), and a guide assembly (5) is fixed on one side of the annular support (2); the translation driving assembly (3) comprises a toothed synchronous belt (31) engaged with the outer surface of the plastic pipeline, and the outer surface of the toothed synchronous belt (31) is provided with staggered diamond-shaped anti-skid protrusions; the pressing assembly (4) comprises a hinged support structure linked by an elastic connecting rod (42) and a hydraulic oil cylinder (44), the hydraulic oil cylinder (44) responds to the diameter change of the pipeline, and the pre-tightening force of the elastic connecting rod (42) is controlled by the displacement of the sliding block (43); the guide assembly (5) comprises symmetrically arranged rotary cams (52), reset springs (53) sleeved on the cam shafts, and roller plungers (54) in contact with the surface of the pipeline.

2. The feeding device for plastic pipe production according to claim 1, characterized in that, The driving mechanism of the translation driving assembly (3) comprises a driving wheel (32) and a driven wheel (33) connected to the inner wall of the toothed synchronous belt (31), and the driving wheel (32) is driven by a speed reducer motor (34); the rotation shafts of the driving wheel (32) and the driven wheel (33) are fixed on a rotating wheel mounting plate (35), the rotating wheel mounting plate (35) is provided with an arc-shaped adjusting groove, and the shaft center of the driving wheel (32) can be moved outward along the groove to increase the wrap angle of the synchronous belt.

3. The feeding device for plastic pipe production according to claim 2, characterized in that, The hinged support structure comprises two parallel support rods (41) hingedly connected to the annular support (2) and the rotating wheel mounting plate (35) at both ends, and the connecting line of the hinge points of the two support rods (41) forms an angle of 15-30° with the pipeline axis; one end of the elastic connecting rod (42) is hingedly connected to the rotating wheel mounting plate (35), and the other end is slidably connected to the sliding groove of the annular support (2) through the sliding block (43), and the sliding block (43) is driven by the hydraulic oil cylinder (44).

4. The feeding device for plastic pipe production according to claim 1, characterized in that, The reset spring (53) is a pre-tightening type laminated disc spring, and the roller surface of the roller plunger (54) is coated with an elastic wear-resistant material.

5. The feeding device for plastic pipe production according to claim 1, characterized in that, The outer surface of the toothed synchronous belt (31) is provided with anti-skid lines, and the contact pressure thereof with the plastic pipeline is dynamically adjusted by the hydraulic oil cylinder (44).

6. The feeding device for plastic pipe production according to claim 1, characterized in that, The guide support (51) of the guide assembly (5) is provided with an angle adjusting bolt for adjusting the initial deflection angle of the rotary cam (52).

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