Pressure rubber extruding machine

Abstract

The utility model discloses a pressure glue extruding machine which comprises a machine box, a fixing frame is fixedly installed on the top side of the machine box, a glue feeding pipe is arranged on the top side of the fixing frame, a connecting assembly is installed on the outer side of the lower end of the glue feeding pipe through bolts, and a feeding assembly and a heating mechanism are arranged on the top side of the machine box. When the upper rubber pipe needs to be detached for inspection and maintenance or maintenance, the first connecting disc and the second connecting disc are separated by detaching a bolt on the top side of the first connecting disc, then the connecting assembly is pushed to move downwards, and then the fixing pipe and the conveying pipe are detached. During installation, an opposite method is used, disassembly and assembly are convenient and fast, maintenance or repair is convenient, the lower end of the conveying pipe is matched with the inner side of the fixing pipe, meanwhile, a sealing sleeve is arranged on the outer side of the lower end of the conveying pipe, and therefore the sealing performance after the upper rubber pipe is connected with the connecting assembly is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of glue extrusion devices, in particular to a pressure glue extruder. Background Art

[0002] A glue applicator is a product processing device, also known as a coating machine, a scraping glue machine, an automatic glue spraying machine, etc. Its main working principle is to apply liquid glue on the surface of textiles, paper boxes or leather by pressurization. The existing glue applicators can be divided into drum glue applicators, double-action glue applicators, double-station lifting glue applicators, etc.

[0003] At present, some of the existing glue applicators are internally provided with a negative pressure pump. By using the negative pressure pump, the glue in the glue bucket is pumped into the glue spraying head, and then sprayed out by the head to coat the glue on the product. Due to the special properties of the glue, it has a certain viscosity, which requires a high demand for the negative pressure pump. After long-term use, the negative pressure pump is very easy to be damaged, thus affecting the service life of the glue applicator. And during the gluing process, it is easy to cause the raw material to be too cold and solidify in a relatively cold environment, resulting in blockage. At the same time, the disassembly and assembly are relatively troublesome, which is not conducive to inspection, maintenance or replacement. Summary of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract and the title of the utility model. However, such simplifications or omissions shall not be used to limit the scope of the present utility model.

[0005] To solve the problem that some of the existing glue applicators are internally provided with a negative pressure pump. By using the negative pressure pump, the glue in the glue bucket is pumped into the glue spraying head, and then sprayed out by the head to coat the glue on the product. Due to the special properties of the glue, it has a certain viscosity, which requires a high demand for the negative pressure pump. After long-term use, the negative pressure pump is very easy to be damaged, thus affecting the service life of the glue applicator. And during the gluing process, it is easy to cause the raw material to be too cold and solidify in a relatively cold environment, resulting in blockage. At the same time, the disassembly and assembly are relatively troublesome, which is not conducive to inspection, maintenance or replacement, the present utility model provides the following technical solutions:

[0006] A pressure glue extruder, comprising a machine case. A fixed frame is fixedly installed on the top side of the machine case. An upper glue pipe is arranged on the top side of the fixed frame. The outer side of the lower end of the upper glue pipe is installed with a connection component through bolts. An upper feeding component and a heating mechanism are arranged on the top side of the machine case. A driving component is arranged inside the machine case;

[0007] The feeding assembly includes a guide rod, a mounting plate, a feeding cylinder and a limiting groove. The driving assembly includes a motor, a mounting cylinder, a threaded rod, a bevel gear set and a fixing sleeve. A threaded hole is formed in the bottom side of the fixing sleeve. The threaded rod is connected to the inside of the fixing sleeve by threads. The threaded rod is installed inside the mounting cylinder through a bearing. A mounting plate is fixedly installed on the top side of the fixing sleeve. Two bevel gears in the bevel gear set are respectively fixedly installed on the outer side of the threaded rod and the right side of the driving end of the motor.

[0008] The beneficial effect of the utility model is that during the gluing process, by turning on the power supply of the heating tube, the heating tube generates heat, and the heat is transferred to the inside of the feeding cylinder through the heat conducting plate, which is beneficial to avoid the glue inside the feeding cylinder from solidifying due to the relatively low external temperature during use, resulting in blockage, reducing the gluing effect. And the sealing plug can be removed, and then it is convenient to add raw materials into the inside of the feeding cylinder through the feeding hole.

[0009] The beneficial effect of the utility model is that when it is necessary to disassemble, inspect, repair or maintain the glue application tube, by removing the bolts on the top side of the first connecting plate, the first connecting plate and the second connecting plate are separated. Then, the connecting assembly is pushed downward to disassemble the fixed tube and the conveying tube, so as to conveniently remove the glue application tube for inspection, repair or maintenance. The opposite method can be used during installation, and the disassembly and installation are convenient and fast, which is convenient for maintenance or repair. And the lower end of the conveying tube fits with the inside of the fixed tube. At the same time, a sealing sleeve is arranged on the outer side of the lower end of the conveying tube, so as to ensure the sealing performance after the glue application tube is connected to the connecting assembly.

[0010] The beneficial effect of the utility model is that by placing the product on the top side of the fixing frame, then starting the motor to drive the bevel gear set to rotate, and then driving the threaded rod to rotate. Then, under the rotation of the threaded rod, the fixing sleeve is driven to lift and lower, which is beneficial to drive the feeding assembly to lift and lower and convey the glue inside the feeding cylinder to the glue application head for gluing under the action of compression, solving the problem that the traditional glue applicator uses a negative pressure pump to work, and the negative pressure pump is easily damaged after long-term use, affecting the service life of the glue applicator. By starting the fan body, it is convenient to drive the air to flow rapidly from the heat dissipation holes on the right side of the chassis, which is beneficial to quickly dissipate the heat inside the chassis, avoiding the heat from accumulating too high and damaging the driving assembly and reducing the service life.

[0011] On the basis of the above technical solutions, the utility model can be further improved as follows.

[0012] As a preferred scheme of the pressure glue extrusion machine of the utility model, wherein: heat dissipation holes are respectively formed on the left and right sides of the chassis, filters are arranged inside the heat dissipation holes, a fan sleeve is fixedly installed on the left side inside the chassis, and a fan body is arranged inside the fan sleeve.

[0013] The beneficial effect of adopting the above further solution is that since the components of the driving assembly mesh and rotate with each other, heat is easily generated. By starting the fan body, it is convenient to drive the air to circulate quickly through the heat dissipation holes on the right side of the chassis, which is beneficial to quickly dissipate the heat inside the chassis and avoid excessive heat accumulation that may damage the driving assembly and reduce its service life.

[0014] As a preferred solution of the pressure glue extruder of the present utility model, wherein: the glue feeding tube includes a glue feeding head, a conveying tube and a first connecting disk. The conveying tube is fixedly installed on the bottom side of the glue feeding head, and the first connecting disk is fixedly installed on the outer side of the conveying tube.

[0015] The beneficial effect of adopting the above further solution is that by disassembling and assembling the bolts, it is convenient to separate the first connecting disk from the second connecting disk for quick disassembly and assembly. At the same time, the lower end of the conveying tube fits with the inner side of the fixed tube, and a sealing sleeve is arranged on the outer side of the lower end of the conveying tube, thus ensuring the sealing performance after the glue feeding tube is connected to the connecting component.

[0016] As a preferred solution of the pressure glue extruder of the present utility model, wherein: the connecting component includes a second connecting disk, a fixed tube, a sealing disk and a feeding hole. The fixed tube is fixedly installed between the second connecting disk and the sealing disk. The conveying tube is snap-fitted inside the fixed tube. A sealing ring is arranged on the outer side of the sealing disk. A feeding hole is opened on the top side of the sealing disk, and a sealing plug is arranged inside the feeding hole.

[0017] The beneficial effect of adopting the above further solution is that the feeding assembly lifts and conveys the glue inside the feeding cylinder to the glue feeding head for glue application under compression. At this time, the feeding cylinder moves outside the sealing disk for compression, and the raw materials can be conveniently added to the inside of the feeding cylinder through the feeding hole by removing the sealing plug.

[0018] As a preferred solution of the pressure glue extruder of the present utility model, wherein: guide rods are respectively fixedly installed at the four corner positions on the bottom side of the mounting plate. The top side of the chassis is movably installed with guide rods, and the feeding cylinder is fixedly installed on the top side of the mounting plate. A limiting groove is opened inside the feeding cylinder, and the size and shape of the limiting groove fit with the sealing disk.

[0019] The beneficial effect of adopting the above further solution is that during use, the limiting groove is beneficial to limit the sealing disk, and at the same time, under the action of the four guide rods, it is beneficial to improve the stability of the feeding cylinder during movement.

[0020] As a preferred embodiment of the pressure glue extruder of the present utility model, the following is provided: the heating mechanism includes a protective sleeve, an installation cavity, heating tubes and a heat conduction plate. The protective sleeve is fixedly installed on the outer side of the feeding cylinder. A heat conduction plate is arranged between the protective sleeve and the feeding cylinder. An installation cavity is opened on one side of the protective sleeve close to the feeding cylinder. Four heating tubes are annularly and equidistantly arranged and installed on the inner side of the installation cavity.

[0021] The beneficial effect of adopting the above further embodiment is that by turning on the power supply of the heating tubes, the heating tubes generate heat, and the heat is transferred to the inner side of the feeding cylinder through the heat conduction plate, which is beneficial to avoiding the glue inside the feeding cylinder from solidifying due to the low external temperature during use, resulting in blockage and reducing the glue application effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0023] Figure 1 It is a three-dimensional view of the whole of this embodiment.

[0024] Figure 2 It is a front sectional view of the chassis of this embodiment.

[0025] Figure 3 It is a front sectional view of the feeding component and the connecting component of this embodiment.

[0026] Figure 4 It is a front sectional view of the driving component of this embodiment.

[0027] Figure 5 For this embodiment Figure 3 The enlarged structure diagram of point A.

[0028] Figure 6 It is a three-dimensional view of the feeding component and the connecting component of this embodiment.

[0029] In the figure: chassis 1, fixing frame 2, upper glue pipe 3, connecting component 4, heating mechanism 5, feeding component 6, driving component 7, heat dissipation holes 101, filter screen 102, fan sleeve 103, fan body 104, upper glue head 301, conveying pipe 302, first connecting disk 303, second connecting disk 401, fixed pipe 402, sealing disk 403, feeding hole 404, guide rod 601, mounting plate 602, feeding cylinder 603, limiting groove 604, protective sleeve 501, mounting cavity 502, heating pipe 503, heat conducting plate 504, motor 701, mounting cylinder 702, threaded rod 703, bevel gear set 704, fixed sleeve 705. Detailed implementation manner

[0030] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present utility model in conjunction with the accompanying drawings of the specification.

[0031] In the following description, many specific details are set forth in order to fully understand the present utility model, but the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0032] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or selectively exclusive embodiment from other embodiments. Embodiment

[0033] Referring to Figures 1 to 6 , which is an embodiment of the present utility model. This embodiment provides a pressure glue extruding machine, including a chassis 1. A fixing frame 2 is fixedly installed on the top side of the chassis 1. An upper glue pipe 3 is arranged on the top side of the fixing frame 2. The outer side of the lower end of the upper glue pipe 3 is installed with a connecting component 4 through bolts. A feeding component 6 and a heating mechanism 5 are arranged on the top side of the chassis 1. A driving component 7 is arranged inside the chassis 1;

[0034] The feeding component 6 includes a guide rod 601, a mounting plate 602, a feeding cylinder 603 and a limiting groove 604. The driving component 7 includes a motor 701, a mounting cylinder 702, a threaded rod 703, a bevel gear set 704 and a fixing sleeve 705. A threaded hole is formed in the bottom side of the fixing sleeve 705. The threaded rod 703 is threadedly connected inside the fixing sleeve 705. The threaded rod 703 is installed inside the mounting cylinder 702 through a bearing. The mounting plate 602 is fixedly installed on the top side of the fixing sleeve 705. Two bevel gears in the bevel gear set 704 are respectively fixedly installed on the outer side of the threaded rod 703 and the right side of the driving end of the motor 701.

[0035] As Figure 1 shown, during use, the product is placed on the top side of the fixing frame 2. Then, the motor 701 is started to drive the bevel gear set 704 to rotate, thereby driving the threaded rod 703 to rotate. Subsequently, under the rotation of the threaded rod 703, the fixing sleeve 705 is driven to lift and lower, which is conducive to driving the feeding component 6 to lift and lower, and conveying the glue inside the feeding cylinder 603 to the glue application head 301 under compression for glue application, solving the problem that the traditional glue applicator uses a negative pressure pump for work, and the negative pressure pump is prone to damage after long-term use, affecting the service life of the glue applicator.

[0036] Furthermore, heat dissipation holes 101 are respectively formed on the left and right sides of the chassis 1. Filter meshes 102 are arranged inside the heat dissipation holes 101. A blower sleeve 103 is fixedly installed on the left side inside the chassis 1. A blower body 104 is arranged inside the blower sleeve 103.

[0037] As Figure 1 shown, during the use process, since the components of the driving component 7 mesh and rotate with each other, heat is easily generated. At this time, the blower body 104 is started, which is convenient to drive the air to flow rapidly from the heat dissipation hole 101 on the right side of the chassis 1, which is conducive to rapidly dissipating the heat inside the chassis 1, avoiding excessive heat accumulation and damaging the driving component 7 and reducing its service life.

[0038] Furthermore, the glue application tube 3 includes a glue application head 301, a conveying tube 302 and a first connecting disc 303. The conveying tube 302 is fixedly installed on the bottom side of the glue application head 301. The first connecting disc 303 is fixedly installed on the outer side of the conveying tube 302.

[0039] As Figure 3 shown, during disassembly and assembly, the disassembly and assembly bolts facilitate the separation of the first connecting disc 303 from the second connecting disc 401, so as to perform rapid disassembly and assembly. At the same time, the lower end of the conveying tube 302 fits inside the fixed tube 402, and a sealing sleeve is arranged on the outer side of the lower end of the conveying tube 302, thereby ensuring the sealing performance after the glue application tube 3 is connected to the connecting component 4.

[0040] Further, the connecting component 4 includes a second connecting plate 401, a fixed pipe 402, a sealing plate 403 and a feeding hole 404. A fixed pipe 402 is fixedly installed between the second connecting plate 401 and the sealing plate 403. A conveying pipe 302 is snap-fitted inside the fixed pipe 402. A sealing ring is provided on the outer side of the sealing plate 403. A feeding hole 404 is opened on the top side of the sealing plate 403, and a sealing plug is provided inside the feeding hole 404.

[0041] As Figure 3 , Figure 6 shown, during the use process, the feeding component 6 moves up and down and conveys the glue inside the feeding cylinder 603 to the glue application head 301 under compression for glue application. At this time, the feeding cylinder 603 moves outside the sealing plate 403 to be compressed. And by removing the sealing plug, it is convenient to add raw materials into the feeding cylinder 603 through the feeding hole 404.

[0042] Further, guide rods 601 are respectively fixedly installed at the four corner positions on the bottom side of the mounting plate 602. The guide rods 601 are movably installed on the top side of the chassis 1. And a feeding cylinder 603 is fixedly installed on the top side of the mounting plate 602. A limiting groove 604 is opened inside the feeding cylinder 603, and the size and shape of the limiting groove 604 are adapted to the sealing plate 403.

[0043] As Figure 1 , Figure 3 shown, during use, the limiting groove 604 helps to limit the sealing plate 403. At the same time, under the action of the four guide rods 601, it helps to improve the stability of the feeding cylinder 603 during the moving process.

[0044] Further, the heating mechanism 5 includes a protective sleeve 501, a mounting cavity 502, heating tubes 503 and a heat conducting plate 504. The protective sleeve 501 is fixedly installed on the outer side of the feeding cylinder 603. A heat conducting plate 504 is provided between the protective sleeve 501 and the feeding cylinder 603. And a mounting cavity 502 is opened on the side of the protective sleeve 501 close to the feeding cylinder 603. Four heating tubes 503 are respectively arranged in a circular and equally spaced manner inside the mounting cavity 502.

[0045] As Figure 3 , Figure 5 shown, during the glue application process, the power supply of the heating tubes 503 is turned on, so that the heating tubes 503 generate heat, and the heat is transferred to the inside of the feeding cylinder 603 through the heat conducting plate 504. Thus, during the use process, it helps to avoid the glue inside the feeding cylinder 603 from solidifying due to the low external temperature, resulting in blockage and reducing the glue application effect.

[0046] Working principle: When in use, place the product on the top side of the fixing frame 2, then start the motor 701 to drive the bevel gear set 704 to rotate, thereby driving the threaded rod 703 to rotate. Subsequently, under the rotation of the threaded rod 703, drive the fixed sleeve 705 to move up and down, which is conducive to driving the feeding assembly 6 to move up and down and conveying the glue inside the feeding cylinder 603 to the glue application head 301 under compression for glue application. This solves the problem that the traditional glue applicator uses a negative pressure pump for work, and the long-term use of the negative pressure pump is prone to damage, affecting the service life of the glue applicator. During the glue application process, by connecting the power supply of the heating tube 503, the heating tube 503 generates heat, and the heat is transferred to the inner side of the feeding cylinder 603 through the heat conduction plate 504. This is conducive to avoiding the glue inside the feeding cylinder 603 from solidifying due to the low external temperature during use, resulting in blockage and reducing the glue application effect. And the raw material can be conveniently added to the inner side of the feeding cylinder 603 through the feeding hole 404 by removing the sealing plug. Subsequently, when it is necessary to disassemble and inspect or maintain the glue application tube 3, by removing the bolts on the top side of the first connecting plate 303, the first connecting plate 303 and the second connecting plate 401 are separated. Then, push the connecting assembly 4 downward to disassemble the fixed tube 402 and the conveying tube 302, so as to conveniently remove the glue application tube 3 for inspection, maintenance or repair. The opposite method can be used during installation, and the disassembly and assembly are convenient and fast, facilitating maintenance or repair. At the same time, the lower end of the conveying tube 302 fits with the inner side of the fixed tube 402, and a sealing sleeve is arranged on the outer side of the lower end of the conveying tube 302 to ensure the sealing performance after the glue application tube 3 is connected to the connecting assembly 4. Subsequently, during the use process, since the components of the driving assembly 7 mesh and rotate with each other, heat is easily generated. At this time, by starting the fan body 104, it is convenient to drive the air to circulate rapidly from the heat dissipation hole 101 on the right side of the chassis 1, which is conducive to quickly dissipating the heat inside the chassis 1, avoiding excessive heat accumulation and damaging the driving assembly 7 and reducing its service life.

[0047] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0048] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present utility model or those features that are not relevant to the implementation of the present utility model).

[0049] It should be understood that in the development of any actual implementation, as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A pressure glue extruder, characterized in that: It comprises a chassis (1), a fixing frame (2) is fixedly mounted on the top side of the chassis (1), a rubber hose (3) is arranged on the top side of the fixing frame (2), a connecting assembly (4) is installed on the outer side of the lower end of the rubber hose (3) by means of bolts, a feeding assembly (6) and a heating mechanism (5) are arranged on the top side of the chassis (1), and a driving assembly (7) is arranged on the inner side of the chassis (1); The feeding assembly (6) comprises a guide rod (601), a mounting plate (602), a feeding barrel (603) and a limiting groove (604); the driving assembly (7) comprises a motor (701), a mounting barrel (702), a threaded rod (703), a bevel gear set (704) and a fixing sleeve (705); a threaded hole is provided on the bottom side of the fixing sleeve (705); the inner side of the fixing sleeve (705) is connected to the threaded rod (703) by threads; the threaded rod (703) is mounted on the inner side of the mounting barrel (702) by bearings; the mounting plate (602) is fixedly mounted on the top side of the fixing sleeve (705); and two bevel gears in the bevel gear set (704) are fixedly mounted on the outer side of the threaded rod (703) and on the right side of the driving end of the motor (701), respectively.

2. The pressure glue extruder according to claim 1, characterized in that: The left and right sides of the chassis (1) are respectively provided with heat dissipation holes (101), the inner sides of the heat dissipation holes (101) are provided with filter screens (102), a fan cover (103) is fixedly installed on the left side of the inner side of the chassis (1), and a fan body (104) is provided on the inner side of the fan cover (103).

3. The pressure glue extruder according to claim 2, characterized in that: The glue application tube (3) comprises a glue application head (301), a delivery tube (302) and a No. 1 connection disk (303); the delivery tube (302) is fixedly mounted on the bottom side of the glue application head (301), and the No. 1 connection disk (303) is fixedly mounted on the outer side of the delivery tube (302).

4. The pressure glue extruder according to claim 3, characterized in that: The connection assembly (4) comprises a No. 2 connection disk (401), a fixed tube (402), a sealing disk (403) and a feeding hole (404); the fixed tube (402) is fixedly installed between the No. 2 connection disk (401) and the sealing disk (403); a delivery tube (302) is mounted on the inner side of the fixed tube (402); a sealing ring is arranged on the outer side of the sealing disk (403); a feeding hole (404) is opened on the top side of the sealing disk (403); and a sealing plug is arranged on the inner side of the feeding hole (404).

5. The pressure glue extruder according to claim 4, characterized in that: Guide rods (601) are fixedly mounted at the four corners of the bottom side of the mounting plate (602), a guide rod (601) is movably mounted on the top side of the chassis (1), and a loading barrel (603) is fixedly mounted on the top side of the mounting plate (602), a limiting groove (604) is provided on the inner side of the loading barrel (603), and the size and shape of the limiting groove (604) are consistent with the sealing disk (403).

6. The pressure glue extruder according to claim 1, characterized in that: The heating mechanism (5) comprises a protective sleeve (501), an installation cavity (502), a heating tube (503) and a heat conducting plate (504); the protective sleeve (501) is fixedly installed on the outside of the upper barrel (603); a heat conducting plate (504) is arranged between the protective sleeve (501) and the upper barrel (603); and an installation cavity (502) is provided on a side of the protective sleeve (501) close to the upper barrel (603); and four heating tubes (503) are respectively installed on the inner side of the installation cavity (502) in an annular and equidistant manner.

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