Production device and process of silica gel foaming pipe

Abstract

The invention relates to the technical field of manufacturing of foaming pipes, in particular to a production device and process for silica gel foaming pipes, which comprises a shell, a plurality of outer heating pipes arrayed in the shell, and an inner heating pipe, the inner heating pipe is arranged in the center of the shell, so that the plurality of outer heating pipes are arranged around the inner heating pipe; the outer heating pipe and the inner heating pipe are vertically mounted; the inner heating pipe is provided with a first magnetic attraction block, second magnetic attraction blocks are arranged on the two sides of the inner wall of the shell respectively, and the inner heating pipe is suspended in the center of the shell through magnetic attraction force of the first magnetic attraction block and the second magnetic attraction blocks. A heating element is arranged on the inner wall of the shell, a heater for receiving the heating element is arranged at the position of the inner heating pipe, the heater conducts heat to the inner heating pipe to enable the inner heating pipe to emit heat, the inner heating pipe and the outer heating pipe heat and harden the interior and the exterior of the foaming pipeline, and the foaming pipe is vertically heated and hardened from the outer heating pipe and the outer heating pipe. The foaming pipe can be prevented from being transversely placed before hardening, and collapse and deformation of the transversely-placed foaming pipe are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing foam tubes, in particular to a production device and process for silicone foam tubes. Background Art

[0002] The main functions of silicone foam tubes are cushioning, shock absorption, thermal insulation, and other purposes. They are mainly used in printing equipment, industrial equipment and pipeline insulation, as well as other fields such as automobiles and household appliances. During the manufacturing process, silicone foam tubes are usually formed into a tubular structure through an extrusion molding process, and then enter the vulcanization stage to cross-link and solidify. However, the raw rubber tube that has just been extruded is in an unvulcanized state, and its molecular chains are not fully cross-linked, resulting in extremely low mechanical strength of the tube body and a soft and collapsed structure. During the vulcanization process, it will continue to foam. The expansion during the foaming process makes the inner and outer walls of the silicone foam tube uneven, resulting in poor geometric accuracy of the product, which does not meet product requirements.

[0003] In most areas, whether the inner wall of the silicone foam tube is flat or not does not have much impact on its use. However, in specific areas, the inner wall of the silicone foam tube is required to be flat, which puts higher requirements on the product precision.

[0004] The industry currently uses two common methods to address this issue. 1. Natural aging hardening, leaving the foam tube to stand for 24-72 hours to wait for initial shaping. This method is inefficient, takes up a lot of storage space, and cannot completely avoid deformation. 2. Place a smooth, flat hard object on the inner wall of the silicone foam tube so that the inner wall adheres to the hard object. After foaming is completed, remove the hard object and use the smooth, flat surface of the hard object to smooth the inner wall of the silicone foam tube. However, due to the length limitation of the hard object, this method cannot produce silicone foam tubes of infinite length, and removing the hard object is also an extremely time-consuming task and inefficient.

[0005] Therefore, it is necessary to provide a device that can produce infinitely long silicone foam tubes with smooth inner and outer walls. Summary of the Invention

[0006] In view of the above-mentioned defects, the purpose of the present invention is to provide a production device and process for silicone foam tubes, which can heat and harden both the inside and the outside of the foam tubes.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A production device for silicone foam tubes includes an outer shell, a plurality of external heating tubes arrayed in the outer shell, and an inner heating tube; the inner heating tube is arranged at the center of the outer shell, so that the plurality of external heating tubes are installed around the inner heating tube; the outer heating tube and the inner heating tube are installed upright; the inner heating tube is provided with a first magnetic block, and second magnetic blocks are respectively provided on both sides of the inner wall of the outer shell, and the inner heating tube is suspended in the center of the outer shell by the magnetic attraction of the first magnetic block and the second magnetic block; the inner wall of the outer shell is provided with a heating element, and the inner heating tube is provided with a heater for receiving the heating element, and the heater conducts heat to the inner heating tube, causing the inner heating tube to generate heat.

[0009] Preferably, the upper and lower ends of the internal heating tube are respectively provided with the first magnetic blocks, and the upper and lower ends of the inner wall of the outer shell are respectively provided with the second magnetic blocks; the first magnetic block at the upper end and the second magnetic block at the upper end are attracted to each other, and the first magnetic block at the lower end and the second magnetic block at the lower end are attracted to each other.

[0010] Preferably, the first magnetic block and the second magnetic block are both made of neodymium magnets.

[0011] Preferably, the length of the inner heating tube is equal to or less than the length of the outer heating tube.

[0012] Preferably, the housing includes a front shell and a rear shell, the front shell is rotatably connected to one side of the opening of the rear shell, and the front shell closes or opens the opening of the rear shell.

[0013] Preferably, heat insulation plates are provided inside the front shell and inside the rear shell.

[0014] Preferably, an inlet is provided at the top of the shell, and an outlet is provided at the bottom of the shell.

[0015] Preferably, the rubber material is extruded to obtain a hollow cylindrical foam tube with an unfixed shape.

[0016] Preferably, the production process of the silicone foam tube comprises the following steps:

[0017] S1: Extruding a silicone material to obtain a hollow cylindrical foam tube with an unfixed shape;

[0018] S2: Place the formed foam tube into the housing, with the inner heating tube sheathed inside the silicone foam tube and not in contact with the inner wall of the silicone foam tube, and the outer heating tube surrounding the silicone foam tube and not in contact with the outer wall of the silicone foam tube;

[0019] S3: Continuously extruding, using the extrusion force and gravity to move the foam tube from the upper end of the inner heating tube to the lower end, the inner heating tube and the outer heating tube heat the inner wall and the outer wall of the foam tube, the heating temperature is 300°C-500°C, the heating time is 30 seconds-150 seconds, so that the inner wall surface and the outer wall surface of the silicone foam tube are initially shaped, and the shaping degree is 15%-50%;

[0020] S4: Place the silicone foam tube flat in a horizontal drying tunnel and heat it at a temperature of 200°C-300°C for 8-15 minutes, so that the silicone foam tube is shaped while foaming, until the shaping degree of the silicone foam tube reaches 100%.

[0021] The technical solution provided by the present invention may include the following beneficial effects: a plurality of external heating tubes are arrayed in an outer shell, an internal heating tube is arranged in the center of the outer shell, and the inner part of the newly formed tube passes through the inner heating tube, so that the inner heating tube and the outer heating tube simultaneously heat the inside and outside of the foaming tube for hardening, the outer heating tube and the outer heating tube are installed upright, and the foaming tube is heated and hardened upright from the outer heating tube and the outer heating tube when it is just formed, which can prevent the foaming tube from being placed horizontally before hardening, and avoid the collapse and deformation of the horizontally placed foaming tube, and the magnetic attraction force of the first magnetic block and the second magnetic block suspends the inner heating tube in the center of the outer shell, making it convenient for the foaming tube to pass through the inner heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a production device for silicone foam tubes according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a production device for silicone foam tubes according to an embodiment of the present invention;

[0024] Among them: 1- shell, 2- external heating tube, 3- internal heating tube, 4- first magnetic block, 5- second magnetic block, 6- heat insulation board, 7- inlet, 8- outlet, 9- heating element, 10- heater, 101- front shell, 102- rear shell. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0027] In the description of the present invention, unless otherwise specified, “several” means one or more than one.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] The following combination Figures 1 to 2 , describing the production device and process of the silicone foam tube according to an embodiment of the present invention.

[0030] A production device for silicone foam tubes includes an outer shell 1, a plurality of external heating tubes 2 arrayed in the outer shell 1, and an inner heating tube 3; the inner heating tube 3 is arranged at the center of the outer shell 1, so that the plurality of external heating tubes 2 are installed around the inner heating tube 3; the outer heating tube 2 and the inner heating tube 3 are installed upright; the inner heating tube 3 is provided with a first magnetic block 4, and second magnetic blocks 5 are respectively provided on both sides of the inner wall of the outer shell 1, and the inner heating tube 3 is suspended in the center of the outer shell 1 by the magnetic attraction force of the first magnetic block 4 and the second magnetic block 5; a heating element 9 is provided on the inner wall of the outer shell 1, and a heater 10 for receiving the heating element 9 is provided at the inner heating tube 3, and the heater 10 conducts heat to the inner heating tube 3, causing the inner heating tube 3 to heat up.

[0031] A production device for silicone foam tubes is used to manufacture foam tubes, especially to heat and fix the foam tubes when they are just formed. Several external heating tubes 2 are arrayed in the outer shell 1, and the inner heating tube 3 is set in the center of the outer shell 1. The interior of the newly formed pipe passes through the inner heating tube 3, so that the inner heating tube 3 and the outer heating tube 2 can heat and harden the inside and outside of the foam tube at the same time. The outer heating tube 2 and the outer heating tube 2 are installed upright, and the foam tube is heated and hardened upright from the outer heating tube 2 and the outer heating tube 2 when it is just formed. This can prevent the foam tube from being placed horizontally before hardening, and avoid the collapse and deformation of the horizontally placed foam tube. The magnetic attraction of the first magnetic block 4 and the second magnetic block 5 suspends the inner heating tube 3 in the center of the outer shell 1, making it easier for the foam tube to pass through the inner heating tube 3. Using the heating element 9 and the heater 10 for heat conduction, the inner heating tube 3 can be suspended in the center of the outer shell 1 for heat conduction.

[0032] The heating element 9 is an electromagnetic induction heating element. Alternating current generates a high-frequency alternating magnetic field through the coil. The heater 10 is a magnetic conductive metal. The heater 10 generates a strong eddy current, thereby generating heat itself and transmitting it to the inner heating tube 3.

[0033] Specifically, first magnetic blocks 4 are provided at the upper and lower ends of the inner heating tube 3, and second magnetic blocks 5 are provided at the upper and lower ends of the inner wall of the outer shell 1. The first magnetic block 4 at the upper end and the second magnetic block 5 at the upper end attract each other, and the first magnetic block 4 at the lower end and the second magnetic block 5 at the lower end attract each other. The presence of first magnetic blocks 4 on each inner heating tube 3 ensures a stable and secure installation of the inner heating tube 3, preventing it from shaking and facilitating the passage of the foam tube.

[0034] To further illustrate, both the first magnetic block 4 and the second magnetic block 5 are made of neodymium magnets. The first magnetic block 4 and the second magnetic block 5 made of neodymium magnets also have conductive properties.

[0035] Specifically, the length of the inner heating tube 3 is equal to or less than that of the outer heating tube 2 , so that the foaming tube first enters the outer heating tube 2 and then penetrates the inner heating tube 3 , and the inner heating tube 3 is installed in the housing 1 .

[0036] Specifically, the housing 1 includes a front housing 101 and a rear housing 102. The front housing 101 is rotatably connected to one side of the opening of the rear housing 102, and the front housing 101 closes or opens the opening of the rear housing 102. It is convenient to open the front housing 101 and the rear housing 102 to inspect or clean the interior.

[0037] Specifically, a heat shield 6 is provided inside the front housing 101 and inside the rear housing 102. This can reduce the temperature outside the front housing 101 and the rear housing 102, and prevent high temperature from being transferred outwards and affecting the outside temperature.

[0038] Specifically, the top of the housing 1 is provided with an inlet 7, and the bottom of the housing 1 is provided with an outlet 8, which is helpful for putting the foaming tube in and out.

[0039] Specifically, the production process of the silicone foam tube includes the following steps:

[0040] S1: Extruding a silicone material to obtain a hollow cylindrical foam tube with an unfixed shape;

[0041] S2: Place the formed foam tube into the housing 1, with the inner heating tube 3 sheathed inside the silicone foam tube without contacting the inner wall of the silicone foam tube, and the outer heating tube 2 surrounding the silicone foam tube without contacting the outer wall of the silicone foam tube;

[0042] S3: Continuously squeeze, using the squeezing force and gravity to move the foaming tube from the upper end of the inner heating tube 3 to the lower end. The inner heating tube 3 and the outer heating tube 2 heat the inner and outer walls of the foaming tube. The heating temperature is 300℃-500℃, and the heating time is 30 seconds-150 seconds. The inner and outer wall surfaces of the silicone foaming tube are initially shaped, and the shaping degree is 15%-50%. The shaping degree of the inner and outer walls of the silicone foaming tube is 15%-50%, which can play a supporting role. When heated and shaped in the subsequent horizontal drying tunnel, the silicone foaming tube will not collapse due to gravity. However, it cannot be completely shaped, and complete shaping is not conducive to subsequent foaming. At the same time, the preliminary shaping of the inner and outer wall surfaces can ensure the smooth surface of the finished product and ensure the roundness of the product in the subsequent horizontal drying tunnel.

[0043] S4: Place the silicone foam tube flat in a horizontal drying tunnel and heat it at a temperature of 200°C-300°C for 8-15 minutes to allow the silicone foam tube to foam and set, until the setting degree of the silicone foam tube reaches 100%.

[0044] Other structures and operations of the production device and process of the silicone foam tube according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0045] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A production device for silicone foam tubes, comprising a housing (1) and a plurality of external heating tubes (2) arrayed in the housing (1), characterized in that: Also includes an internal heating pipe (3); The inner heating tube (3) is arranged at the center of the outer shell (1), so that a plurality of the outer heating tubes (2) are installed around the inner heating tube (3); The outer heating tube (2) and the inner heating tube (3) are installed vertically; The inner heating tube (3) is provided with a first magnetic block (4), and second magnetic blocks (5) are respectively provided on both sides of the inner wall of the outer shell (1), and the inner heating tube (3) is suspended in the center of the outer shell (1) by the magnetic attraction of the first magnetic block (4) and the second magnetic block (5); A heating element (9) is provided on the inner wall of the outer shell (1), and a heater (10) for receiving the heating element (9) is provided at the inner heating tube (3). The heater (10) conducts heat to the inner heating tube (3), causing the inner heating tube (3) to generate heat.

2. The production device for silicone foam tube according to claim 1, characterized in that: The upper and lower ends of the inner heating tube (3) are respectively provided with the first magnetic blocks (4), and the upper and lower ends of the inner wall of the outer shell (1) are respectively provided with the second magnetic blocks (5); The first magnetic block (4) at the upper end and the second magnetic block (5) at the upper end are attracted to each other, and the first magnetic block (4) at the lower end and the second magnetic block (5) at the lower end are attracted to each other.

3. The production device of the silicone foam tube according to claim 1, characterized in that: The first magnetic block (4) and the second magnetic block (5) are both made of neodymium magnets.

4. The production device of the silicone foam tube according to claim 1, characterized in that: The length of the inner heating tube (3) is equal to or less than the length of the outer heating tube (2).

5. The production device of the silicone foam tube according to claim 1, characterized in that: The housing (1) comprises a front housing (101) and a rear housing (102); the front housing (101) is rotatably connected to one side of an opening of the rear housing (102); and the front housing (101) closes or opens the opening of the rear housing (102).

6. The production device for silicone foam tube according to claim 5, characterized in that: Heat insulation boards (6) are provided inside the front shell (101) and inside the rear shell (102).

7. The production device of the silicone foam tube according to claim 1, characterized in that: The top of the shell (1) is provided with an inlet (7), and the bottom of the shell (1) is provided with an outlet (8).

8. The production process of the silicone foam tube according to claim 1, characterized in that: The steps include: S1: Extruding a silicone material to obtain a hollow cylindrical foam tube with an unfixed shape; S2: placing the formed foam tube into the housing (1), the inner heating tube (3) being sheathed inside the silicone foam tube without contacting the inner wall of the silicone foam tube, and the outer heating tube (2) being surrounded outside the silicone foam tube without contacting the outer wall of the silicone foam tube; S3: Continuously extruding, using the extrusion force and gravity to move the foaming tube from the upper end of the inner heating tube (3) to the lower end, the inner heating tube (3) and the outer heating tube (2) heat the inner wall and outer wall of the foaming tube, the heating temperature is 300°C-500°C, the heating time is 30 seconds-150 seconds, so that the inner wall surface and the outer wall surface of the silicone foaming tube are initially shaped, and the shaping degree is 15%-50%; S4: Place the silicone foam tube flat in a horizontal drying tunnel and heat it at a temperature of 200°C-300°C for 8-15 minutes to allow the silicone foam tube to foam and set, until the setting degree of the silicone foam tube reaches 100%.

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