Anti-blocking device for extruder

Abstract

The utility model belongs to the technical field of plastic extruders, and particularly relates to an anti-blocking device for an extruder. The anti-blocking device structurally comprises a mounting pipe used for being connected to a heating cylinder in a sleeving mode, an annular end plate unit arranged on the mounting pipe and used for abutting against the end face of the heating cylinder, and an electric heating rod arranged on the annular end plate unit and used for being inserted into the annular end plate unit to heat and melt a solidified block. And the shell unit is arranged on the annular end plate unit and is used for receiving molten materials. The anti-blocking device at least has the beneficial effects that the anti-blocking device has an insertion type heating function and can melt a solidified block, so that an active and sufficient extrusion opening anti-blocking effect is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastic extruders, and particularly relates to an anti-blocking device for an extruder. BACKGROUND

[0002] The structural components of a plastic extruder mainly include a feeding hopper, a heating cylinder, a driving motor, and a screw rod. The principle of the plastic extruder is as follows: the feeding hopper is used for adding plastic particles, the heating cylinder is used for melting the plastic particles, and the driving motor is used for adjusting the rotating speed of the screw rod, so that the extrusion speed is appropriate, thereby ensuring that the plastic extruded part has sufficient and appropriate density and structural strength.

[0003] On the other hand, after the plastic extruder is stopped or at the end of the production process of a batch of plastic extruded parts, the residual material in the heating cylinder can be pushed to the discharge port by the screw rod, so that most of the area in the heating cylinder is not left with residual material, and the heating cylinder is not blocked due to the solidification of the melted plastic.

[0004] However, near the extrusion port of the heating cylinder, the residual material is difficult to be continuously pushed forward by the screw rod, and thus can only be left near the extrusion port and finally solidified and blocked, resulting in very difficult subsequent extrusion operation.

[0005] Correspondingly, there are various new types of extruders with anti-blocking function. For example, the anti-blocking single-screw extruder for plastic pipe forming disclosed in the Chinese Utility Model Patent with the authorization announcement number CN216782597U and the authorization announcement date of June 21, 2022, has the structure including a workbench, a support table, a support frame, a feeding mechanism, an extrusion mechanism, and a cooling mechanism. The feeding mechanism further includes a rotating motor, a support plate, a feeding hopper, a crushing pushing rod, a crushing knife, and a screen.

[0006] The anti-blocking single-screw extruder in the utility model patent has the following general principle and main advantages: the crushing knife and the pushing blade are arranged in the feeding mechanism. After the material is added to the feeding hopper, the material particles are crushed under the action of the crushing knife, pass through the screen, enter the pushing pipe, and are sent to the feeding pipe under the pushing of the pushing blade. Since the material particles are relatively small, the blocking at the feeding port is avoided.

[0007] However, the anti-blocking single-screw extruder has at least the following problems of insufficient and insufficient anti-blocking function in actual use, which is specifically manifested in that:

[0008] The screw structure of the device can indeed obtain a certain degree of anti-blocking effect of the extrusion outlet by protruding from the outlet end, but the effect is passive and general, and can only stir the solidified plastic at the initial stage of solidification to delay the solidification speed, and it is difficult to fully remove the solidified plastic block. Utility model content

[0009] The application provides an anti-blocking device for an extruder, which aims to fully remove the solidified plastic block near the extrusion outlet and obtain a complete anti-blocking effect.

[0010] The application solves the above problems by adopting the technical scheme of an anti-blocking device for an extruder, which comprises a mounting pipe for sleeving on a heating cylinder, a ring-shaped end plate unit arranged on the mounting pipe and used for abutting against an end face of the heating cylinder, an electric heating rod arranged on the ring-shaped end plate unit and used for inserting and heating the solidified block, and a shell unit arranged on the ring-shaped end plate unit and used for receiving the molten material.

[0011] Further preferred technical schemes are that the ring-shaped end plate unit comprises a circular ring-shaped plate arranged on the mounting pipe and used for abutting against the end face of the heating cylinder, and a radial plate arranged on an inner ring surface of the circular ring-shaped plate and used for mounting the electric heating rod.

[0012] Further preferred technical schemes are that the diameter of the inner ring surface of the circular ring-shaped plate near one end of the heating cylinder is smaller than the diameter of the inner ring surface of the circular ring-shaped plate away from the other end of the heating cylinder.

[0013] Further preferred technical schemes are that the shell unit comprises an arc-shaped plate arranged on the circular ring-shaped plate, and a bow-shaped plate arranged on the arc-shaped plate and used for blocking the molten material.

[0014] Further preferred technical schemes are that the number of the arc-shaped plates is two, and one of the arc-shaped plates is further provided with a pulling rod unit for inserting the softened solidified block.

[0015] Further preferred technical schemes are that the pulling rod unit comprises a rod body for inserting the softened solidified block, a protruding block arranged on the rod body, and an insertion tip arranged on an end face of the rod body.

[0016] Further preferred technical schemes are that the shell unit further comprises a rotating holding notch arranged on the bow-shaped plate and used for pouring and collecting the molten material by rotating the anti-blocking device for the extruder.

[0017] Further preferably, the shell unit further comprises a receiving notch arranged on one of the arc-shaped plates and used for clamping and fixing the pull-out rod unit; and the ring-shaped end plate unit further comprises a receiving groove arranged on the circular ring-shaped plate and used for inserting and fixing the pull-out rod unit.

[0018] Further preferably, the shell unit further comprises an electric heating rod wire hole arranged on one of the arc-shaped plates.

[0019] Further preferably, the pull-out rod unit further comprises a rubber holding sleeve arranged on the rod body.

[0020] The application has at least the following four advantages.

[0021] Firstly, the anti-blocking device has an insertion heating function, which can melt the solidified block, thereby achieving an active and sufficient anti-blocking effect.

[0022] Secondly, the anti-blocking device also has a molten material receiving function, so that the molten material can be recycled and reused, and the safety of the molten anti-blocking operation is greatly improved.

[0023] Thirdly, the pull-out rod unit has a solidified block pulling function, which cooperates with the above-mentioned small-amplitude and short-time solidified block melting function, so that the anti-blocking operation is more efficient, flexible and suitable.

[0024] Fourthly, the pull-out rod unit itself has the dual advantages of convenient taking and placing and stable placement in standby state. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of the use of the application.

[0026] Figure 2 The figure is a schematic diagram of a position shape of the solidified block in the application.

[0027] Figure 3 The figure is a schematic diagram of the structure of the application.

[0028] Figure 4 The figure is a schematic diagram of the position structure of the shell unit in the application from a side view.

[0029] Figure 5 The figure is a schematic diagram of the pouring and recycling method of the molten material in the application.

[0030] Figure 6 The figure is a schematic diagram of the receiving method of the molten material in the application.

[0031] Figure 7 The figure is a schematic diagram of the use of the pull-out rod unit in the application.

[0032] Figure 8 This is a schematic diagram of the idle placement status of this application.

[0033] Figure 9 This is a schematic diagram of the pull-out rod unit in this application.

[0034] The meanings of the markings in the diagram are as follows.

[0035] Heating cylinder (a), solidification block (b), molten material (c), screw (d), ground (e);

[0036] 1. Mounting tube; 2. Annular end plate unit; 3. Electric heating rod; 4. Housing unit; 5. Pull-out rod unit;

[0037] Circular plate 201, radial plate 202, storage groove 203;

[0038] 401. Arc-shaped plate; 402. Bow-shaped plate; 403. Rotation gripping notch; 404. Storage notch; 405. Electric heating rod wire through hole.

[0039] Rod body 501, protrusion 502, insertion tip 503, rubber grip sleeve 504. Detailed Implementation

[0040] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0041] like Figures 1-9 As shown, an anti-clogging device for an extruder includes an installation tube 1 for fitting onto a heating cylinder a, an annular end plate unit 2 disposed on the installation tube 1 and for abutting against the end face of the heating cylinder a, an electric heating rod 3 disposed on the annular end plate unit 2 and for inserting and heating the molten solidified block b, and a housing unit 4 disposed on the annular end plate unit 2 and for receiving molten material c.

[0042] In this embodiment, the anti-clogging device is applicable to single-screw and twin-screw extruders. The main body of the anti-clogging device is made of metal or engineering plastic. The mounting tube 1, the annular end plate unit 2, and the housing unit 4 are integrally formed. The electric heating rod 3 is a commercially available product, belonging to the single-head heating rod type, and is screwed or snap-fitted to the annular end plate unit 2.

[0043] The general method of using this anti-blocking device is as follows:

[0044] First, when the extruder has stopped and a relatively large and hard solidified block b has been formed at the extrusion outlet, the anti-blocking device can be used. First, the installation tube 1 is sleeved onto the heating cylinder a. There is no need for the two to fit tightly together. Just make sure that the electric heating rod 3 is roughly aligned with the solidified block b.

[0045] Second, if the electric heating rod 3 and the ring-shaped end plate unit 2 are fixedly connected, the electric heating rod 3 has been fully and appropriately inserted into the solidification block b when the mounting pipe 1 is sleeved and mounted, and then the solidification block b can be directly opened. If the electric heating rod 3 and the ring-shaped end plate unit 2 are movably connected, the electric heating rod 3 needs to be manually inserted into the solidification block b before being opened, and adjusted to an appropriate insertion depth and position to avoid the screw rod d from damaging the electric heating rod 3.

[0046] Third, the solidification block b melts into molten material c when heated, and then flows into the shell unit 4. At this time, the entire anti-blocking device is removed, and the molten material c is allowed to flow out of the shell unit 4 by rotating along the axial direction of the device, thereby recycling and reusing, and finally completing the entire anti-blocking operation of the extrusion port.

[0047] It should be noted that:

[0048] First, the helical blades on the screw rod d have a function of pushing forward the material, so the solidification block b can only be located in the front of the extrusion port and the frontmost helical blade, so that the electric heating rod 3 can be fully heated and melted. For details, please refer to the accompanying drawings Figure 1 、 2 and 7;

[0049] Second, the highest heating temperature of the electric heating rod 3 is generally about 700°C, so most types of plastics can be melted.

[0050] Third, the cross-sectional shape of the mounting pipe 1 is circular or rectangular, and further provided with radial tightening bolts or an inner annular elastic layer, so that the mounting pipe 1 can be fully and appropriately fixed and mounted on various heating cylinder bodies a of different diameters. Even if the cross-sectional shape of the heating cylinder body a is not circular, such as oval or rectangular.

[0051] The ring-shaped end plate unit 2 includes a circular ring plate 201 arranged on the mounting pipe 1 and used for abutting against the end face of the heating cylinder body a, and a radial plate 202 arranged on the inner annular surface of the circular ring plate 201 and used for mounting the electric heating rod 3.

[0052] In this embodiment, the radial plate 202 and the insulating shell of the electric heating rod 3 are fixed by screwing, bonding or clamping, so that the heating head part of the electric heating rod 3 can be fully inserted into the solidification block b, while avoiding bumping the screw rod d.

[0053] Correspondingly, the electric heating rod 3 and the screw rod d do not need to be strictly aligned. When the extruder is a double-screw type, the electric heating rod 3 should be inserted between the two screw rods d.

[0054] The diameter of the inner ring surface of the circular ring plate 201 near one end of the heating cylinder a is smaller than the diameter of the inner ring surface of the circular ring plate 201 far from one end of the heating cylinder a.

[0055] In this embodiment, the center hole of the circular ring plate 201 is in the form of an enlarged hole, so that the molten material c can flow more conveniently and quickly onto the shell unit 4 to complete the recycling operation of the molten plastic.

[0056] Of course, the molten material c will inevitably remain in the heating cylinder a, but at this time most of the solidified block b has been left on the shell unit 4, and the extrusion port is unobstructed. Even if the small amount of residual material re-solidifies, it is not possible to block the extrusion port again, so the anti-blocking operation is also effective.

[0057] The shell unit 4 includes an arc-shaped plate 401 arranged on the circular ring plate 201, and an arc-shaped plate 402 arranged on the arc-shaped plate 401 and used to block the molten material c.

[0058] In this embodiment, the central angle of the arc-shaped plate 401 and the arc-shaped plate 402 is equal, both > 90°, which together with the circular ring plate 201 and the arc-shaped plate 402 forms a shell for temporarily receiving the molten material c.

[0059] When the anti-blocking device is used to melt the solidified block b, the opening of the shell is upward, and the molten material c first flows through the center hole on the circular ring plate 201, then flows down on the circular ring plate 201, and finally is received on the arc-shaped plate 401, thereby making the anti-blocking operation more secure and energy-saving.

[0060] The number of arc-shaped plates 401 is 2, and one of the arc-shaped plates 401 is further provided with a pulling rod unit 5 for inserting the softened solidified block b.

[0061] In this embodiment, when the anti-blocking device is in normal use, the arc-shaped plate 401 provided with the pulling rod unit 5 is on the top, and the other is on the bottom. The former generally does not perform the receiving operation of the molten material, and is mainly used for installing the pulling rod unit 5.

[0062] Correspondingly, the correct use method of the anti-blocking device mainly has the following two kinds:

[0063] First, the electric heating rod 3 fully melts the solidified block b to obtain the molten material c in the shell unit 4, and the pulling rod unit 5 is idle;

[0064] Second, the electric heating rod 3 first softens the solidified block b, then the pulling rod body unit 5 is inserted into the solidified block b, and finally the pulling rod body unit 5 is pulled out, so that the solidified block b can be taken out, and the extrusion port anti-blocking effect is achieved.

[0065] Wherein, the anti-blocking device can be removed from the heating cylinder a when the pulling rod body unit 5 is inserted into the solidified block b, and the installation pipe 1 with the annular end plate unit 2, the electric heating rod 3 and the shell unit 4 need to be removed from the heating cylinder a before the pulling rod body unit 5 starts to pull.

[0066] The pulling rod body unit 5 comprises a rod body 501 for inserting the softened solidified block b, a protruding block 502 arranged on the rod body 501, and an insertion tip 503 arranged on the end face of the rod body 501.

[0067] In this embodiment, the rod body 501 is a round rod, and the protruding block 502 is rectangular in shape, with the mounting end closer to the insertion tip 503 than the non-mounting end, thereby forming a "barb" for easily pulling out the solidified block b.

[0068] Wherein, the insertion tip 503 is conical in shape.

[0069] The shell unit 4 further comprises a rotating holding notch 403 arranged on the arc plate 402 and used for pouring and collecting the molten material c by rotating the anti-blocking device for the extruder.

[0070] In this embodiment, the rotating holding notch 403 and the pulling rod body unit 5 are arranged on the same arc plate 402, which is generally not used to receive the molten material c.

[0071] The rotating holding notch 403 is used for the operator to hold it with his hand, so that the entire anti-blocking device can be rotated more conveniently, and the molten material c can be poured and recovered more safely from the other arc plate 402, which can be referred to in detail in the accompanying drawings Figure 5 At this time, the anti-blocking device has generally been removed from the heating cylinder a.

[0072] The shell unit 4 further comprises a receiving notch 404 arranged on one of the arc plates 402 and used for clamping and fixing the pulling rod body unit 5, and the annular end plate unit 2 further comprises a receiving groove 203 arranged on the circular ring plate 201 and used for inserting and fixing the pulling rod body unit 5.

[0073] In this embodiment, the role of the storage notch 404 is to hold the pull-out rod unit 5 in the idle standby state, ensuring that the latter has a stable and secure resting standby state.

[0074] Correspondingly, the storage slot 203 is used to insert the insertion tip 503, further preventing the pull-out rod unit 5 from accidentally falling, and the engagement position of the storage notch 404 is the rod 501, i.e., at this time the protruding block 502 is entirely located inside the arc plate 402, and the protruding block 502 is prevented from accidentally injuring the operator.

[0075] The shell unit 4 also includes an electric heating rod wire hole 405 provided on one of the arc plates 402.

[0076] In this embodiment, one of the arc plates 401, along with the arc plate 402 thereon, generally does not receive molten material c and has at least the following three functions:

[0077] First, as a rotating action holding position for pouring and collecting molten material c on the other arc plate 401, i.e., the rotating holding notch 403;

[0078] Second, to stably rest the pull-out rod unit 5 in the idle state;

[0079] Third, to stably install the electric heating rod wire, preventing the wire from being damaged by touching the molten material c.

[0080] The pull-out rod unit 5 also includes a rubber holding sleeve 504 provided on the rod 501.

[0081] In this embodiment, the rubber holding sleeve 504 has at least the following two functions:

[0082] First, to make the action of inserting and pulling out the pull-out rod unit 5 into and out of the solidified block b more comfortable and convenient;

[0083] Second, the storage notch 404 directly holds the rubber holding sleeve 504, making the storage notch 404 have greater and more stable holding strength for the pull-out rod unit 5.

[0084] In addition, another function of the installation pipe 1 is that when the anti-blocking device is idle, the installation pipe 1 is placed on the ground, which can prevent the electric heating rod 3 from being broken, which is very practical and safe. For details, please refer to the attached Figure 8 .

[0085] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. These are modifications without creativity, and are protected by the patent law within the scope of the claims of the present application.

Claims

1. A device for preventing clogging of an extruder, characterized by: The structure comprises a mounting pipe (1) for sleeving on a heating cylinder (a), an annular end plate unit (2) arranged on the mounting pipe (1) and used for abutting against an end face of the heating cylinder (a), an electric heating rod (3) arranged on the annular end plate unit (2) and used for inserting and heating a molten solidified block (b), and a housing unit (4) arranged on the annular end plate unit (2) and used for receiving molten material (c).

2. The anti-blocking device for an extruder according to claim 1, characterized in that: The annular end plate unit (2) comprises a circular ring plate (201) arranged on the mounting pipe (1) and used for abutting against an end face of the heating cylinder (a), and a radial plate (202) arranged on an inner ring surface of the circular ring plate (201) and used for mounting the electric heating rod (3).

3. A device for preventing blockage of an extruder according to claim 2, characterized in that: A diameter of the inner ring surface of the circular ring plate (201) close to one end of the heating cylinder (a) is smaller than a diameter of the inner ring surface of the circular ring plate (201) away from the one end of the heating cylinder (a).

4. The anti-jamming device for an extruder according to claim 2, characterized in that: The housing unit (4) comprises an arc-shaped plate (401) arranged on the circular ring plate (201), and an arc-shaped plate (402) arranged on the arc-shaped plate (401) and used for blocking the molten material (c).

5. A device for preventing blockage of an extruder according to claim 4, characterized in that: The number of the arc-shaped plates (401) is two, and one of the arc-shaped plates (401) is further provided with a pulling rod unit (5) for inserting the already softened solidified block (b).

6. A device for preventing blockage of an extruder according to claim 5, characterized in that: The pulling rod unit (5) comprises a rod body (501) for inserting the already softened solidified block (b), a protruding block (502) arranged on the rod body (501), and an insertion tip (503) arranged on an end face of the rod body (501).

7. The anti-jamming device for an extruder according to claim 4, characterized in that: The housing unit (4) further comprises a rotating holding notch (403) arranged on the arc-shaped plate (402) and used for preventing the extruder from being blocked by rotating the extruder.

8. The anti-jamming device for an extruder according to claim 5, characterized in that: The housing unit (4) further comprises a receiving notch (404) arranged on one of the arc-shaped plates (402) and used for clamping and fixing the pulling rod unit (5); and the annular end plate unit (2) further comprises a receiving groove (203) arranged on the circular ring plate (201) and used for inserting and fixing the pulling rod unit (5).

9. The anti-jamming device for an extruder according to claim 5, characterized in that: The housing unit (4) further comprises an electric heating rod wire perforation (405) arranged on one of the arc-shaped plates (402).

10. The anti-jamming device for an extruder according to claim 6, characterized in that: The pulling rod unit (5) further comprises a rubber holding sleeve (504) arranged on the rod body (501).

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