Extruder screw rod for producing hot melt glue stick

Abstract

The utility model relates to the technical field of extruder screws, in particular to an extruder screw for producing hot melt adhesive sticks, which comprises a screw head, one side of the screw head is fixedly connected with a mounting rod, the outer wall of the mounting rod is sleeved with a cylindrical screw main body, the screw main body comprises a feeding section, a crushing section and a discharging section, and the feeding section is connected with the crushing section. The crushing section is located between the feeding section and the discharging section, a mounting groove concentric with the mounting rod is formed in the side, where the mounting rod is fixed, of the screw head, the screw main body is screwed, the screw main body is fixed through cooperation of the internal thread and the external thread, and the internal thread, the external thread and the thread direction are opposite to the extrusion rotation direction. According to the structure, when the extruder works normally, the rotation direction of the screw is opposite to the directions of the internal threads and the external threads, so that the mounting stability of the screw main body is greatly improved, the screw main body is prevented from loosening and even falling off, and the screw structure is convenient to disassemble and assemble, saves time and saves the use cost.

Description

Technical Field

[0001] The utility model relates to the technical field of extruder screws, in particular to an extruder screw for producing hot melt adhesive sticks. Background Art

[0002] Hot melt glue stick is a solid adhesive made of ethylene-vinyl acetate copolymer (EVA) as the main material, with tackifier and other ingredients added. It has the characteristics of fast bonding, high strength, aging resistance, non-toxicity, and good thermal stability. It can be used for wood, plastic, fiber, fabric, metal, furniture, lampshade, leather, handicrafts, electronic toys, electrical components, paper products, ceramics, pearl cotton packaging and other solids. It is commonly used in factories and homes. Extruders are required in the production process of hot melt glue sticks;

[0003] Extruder is one of the types of plastic machinery. Screw extruder relies on the pressure and shear force generated by the rotation of the screw to fully plasticize and evenly mix the materials and form them through the die. The screw is the most important component of the extruder. The screw is directly related to the application range and productivity of the extruder. It is made of high-strength and corrosion-resistant alloy steel:

[0004] However, the extruder screws currently on the market are usually of an integrated structure. When the screw needs to be maintained and replaced, the screw must be disassembled as a whole. On the one hand, the disassembly and replacement is very inconvenient, time-consuming and labor-intensive. On the other hand, when the screw is scrapped, it can only be replaced with a new screw as a whole, which increases the cost of use. Utility Model Content

[0005] The utility model aims to provide an extruder screw for producing hot melt adhesive sticks, which has the characteristics of convenient disassembly and assembly, time saving, and cost saving.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a screw rod of an extruder for producing hot-melt adhesive sticks, comprising a screw head, one side of the screw head is fixedly connected to a mounting rod, the outer wall of the mounting rod is sleeved with a screw body of a tubular structure, the screw body comprises a feeding section, a crushing section and a discharging section, the crushing section is located between the feeding section and the discharging section, one side of the screw head on which the mounting rod is fixed is provided with a mounting groove concentric with the mounting rod, the inner wall of the mounting groove is provided with an internal thread, and the outer wall of one end of the screw body is provided with an external thread matching the internal thread.

[0007] In order to limit and fix the screw body, as a preferred extruder screw for producing hot melt adhesive sticks of the utility model, a limiting thread is provided on the outer wall of one end of the mounting rod away from the screw head, and the outer wall of the limiting thread is threadedly connected to a limiting sleeve.

[0008] In order to facilitate the extrusion of materials, as a preferred extruder screw for producing hot melt adhesive sticks of the utility model, the outer walls of the feed section and the discharge section are fixedly connected with a plurality of evenly distributed spiral sheets.

[0009] In order to improve the crushing effect of the material, as a preferred embodiment of the extruder screw for producing hot melt adhesive sticks of the utility model, the outer wall of the crushing section is fixedly connected with a plurality of evenly distributed crushing protrusions.

[0010] In order to facilitate the installation of the screw, as a preferred extruder screw for producing hot melt adhesive sticks of the utility model, a mounting head is fixedly connected to a side of the screw head away from the mounting rod, and a mounting hole is opened on the outer wall of the mounting head.

[0011] In order to avoid material jamming inside the installation groove, as a preferred embodiment of the present invention, an extruder screw for producing hot melt adhesive sticks has a wall thickness of the screw body that matches the groove width of the installation groove.

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

[0013] The screw can be directly installed on the inner side of the extruder barrel through the mounting head and the mounting hole during installation. When maintenance or replacement is required later, it is only necessary to twist the screw body to remove the screw body from the inside of the mounting groove, and then the screw body can be pulled out of the outer wall of the mounting rod. When replacing, the new screw body is sleeved on the outer wall of the mounting rod, so that one end of the screw body is inserted into the mounting groove, and then the screw body is twisted to fix the screw body through the cooperation of the internal thread and the external thread, wherein the internal thread and the external thread and the thread direction are opposite to the extrusion rotation direction. Such a structure enables the screw to rotate in the opposite direction to the internal thread and the external thread when the extruder is working normally, thereby greatly improving the installation stability of the screw body and preventing the screw body from loosening or even falling off. The screw structure is easy to disassemble and assemble, saves time, and saves use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall exploded state of the utility model;

[0016] Figure 3 It is a partial three-dimensional structural diagram of the utility model.

[0017] In the figure: 1. screw head; 2. mounting rod; 3. screw body; 4. feed section; 5. crushing section; 6. discharge section; 7. spiral sheet; 8. crushing convex particle; 9. mounting groove; 10. internal thread; 11. limiting thread; 12. limiting sleeve; 13. mounting head; 14. mounting hole; 15. external thread. DETAILED DESCRIPTION

[0018] See also Figures 1 to 3 A screw rod of an extruder for producing hot melt adhesive sticks comprises a screw head 1, one side of the screw head 1 is fixedly connected with a mounting rod 2, the outer wall of the mounting rod 2 is sleeved with a screw body 3 of a cylindrical structure, the screw body 3 comprises a feeding section 4, a crushing section 5 and a discharging section 6, the crushing section 5 is located between the feeding section 4 and the discharging section 6, one side of the screw head 1 on which the mounting rod 2 is fixed is provided with a mounting groove 9 concentric with the mounting rod 2, the inner wall of the mounting groove 9 is provided with an internal thread 10, and the outer wall of one end of the screw body 3 is provided with an external thread 15 matching the internal thread 10.

[0019] In this embodiment: the screw can be directly installed on the inner side of the extruder barrel through the mounting head 13 and the mounting hole 14 during installation. When maintenance or replacement is required later, it is only necessary to twist the screw body 3 to disassemble the screw body 3 from the inside of the mounting groove 9, and then the screw body 3 can be pulled out of the outer wall of the mounting rod 2. When replacing, the new screw body 3 is sleeved on the outer wall of the mounting rod 2, so that one end of the screw body 3 is inserted into the mounting groove 9, and then the screw body 3 is twisted, and the screw body 3 is fixed by the cooperation of the internal thread 10 and the external thread 15, wherein the internal thread 10 and the external thread 15 and the thread direction are opposite to the extrusion rotation direction. Such a structure enables the extruder to work normally, and the screw rotation direction is opposite to the direction of the internal thread 10 and the external thread 15, thereby greatly improving the installation stability of the screw body 3, and preventing the screw body 3 from loosening or even falling off. The screw structure is easy to disassemble and assemble, saves time, and saves use cost.

[0020] As a technical optimization solution of the utility model, a limiting thread 11 is provided on the outer wall of one end of the installation rod 2 away from the screw head 1 , and the outer wall of the limiting thread 11 is threadedly connected to the limiting sleeve 12 .

[0021] In this embodiment: after the screw body 3 is installed on the outer wall of the mounting rod 2, the limiting sleeve 12 is installed on the end of the mounting rod 2 through the limiting thread 11, so as to further limit the screw body 3 from the end and improve the fixing effect of the screw body 3.

[0022] As a technical optimization solution of the present utility model, the outer walls of the feed section 4 and the discharge section 6 are fixedly connected with a plurality of evenly distributed spiral sheets 7 .

[0023] In this embodiment, the outer walls of the feed section 4 and the discharge section 6 are fixedly connected with a plurality of evenly distributed spiral blades 7, so as to facilitate the extrusion of the material.

[0024] As a technical optimization solution of the utility model, the outer wall of the crushing section 5 is fixedly connected with a plurality of evenly distributed crushing protrusions 8.

[0025] In this embodiment: a plurality of evenly distributed crushing convex particles 8 are fixedly connected to the outer wall of the crushing section 5, so as to facilitate the crushing of the material and improve the crushing effect.

[0026] As a technical optimization solution of the present invention, a mounting head 13 is fixedly connected to a side of the screw head 1 away from the mounting rod 2 , and a mounting hole 14 is formed on an outer wall of the mounting head 13 .

[0027] In this embodiment, the screw body 3 can be directly installed on the inner side of the extrusion barrel through the installation head 13 and the installation hole 14.

[0028] As a technical optimization solution of the present invention, the wall thickness of the screw body 3 matches the groove width of the mounting groove 9 .

[0029] In this embodiment, the wall thickness of the screw body 3 matches the width of the installation groove 9 , so that the screw body 3 is tightly connected to the screw head 1 after installation, avoiding material jamming inside the installation groove 9 .

[0030] Working principle: When installing, the screw can be directly installed on the inner side of the extruder barrel through the mounting head 13 and the mounting hole 14. When maintenance or replacement is required later, it is only necessary to twist the screw body 3 to disassemble the screw body 3 from the inside of the mounting groove 9, and then the screw body 3 can be pulled out of the outer wall of the mounting rod 2. When replacing, the new screw body 3 is sleeved on the outer wall of the mounting rod 2, so that one end of the screw body 3 is inserted into the mounting groove 9, and then the screw body 3 is twisted. The screw body 3 is fixed by the cooperation of the internal thread 10 and the external thread 15, wherein the internal thread 10 and the external thread 15 and the thread direction are opposite to the extrusion rotation direction. Such a structure enables the screw to rotate in the opposite direction of the internal thread 10 and the external thread 15 when the extruder is working normally, thereby greatly improving the installation stability of the screw body 3 and preventing the screw body 3 from loosening or even falling off. The screw structure is easy to disassemble and assemble, saves time, and saves use costs.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An extruder screw for producing hot melt adhesive sticks, comprising a screw head (1), characterized in that: A mounting rod (2) is fixedly connected to one side of the screw head (1), and a screw body (3) of a cylindrical structure is sleeved on the outer wall of the mounting rod (2). The screw body (3) comprises a feeding section (4), a crushing section (5) and a discharging section (6), and the crushing section (5) is located between the feeding section (4) and the discharging section (6). A mounting groove (9) concentric with the mounting rod (2) is provided on one side of the screw head (1) to which the mounting rod (2) is fixed, and an internal thread (10) is provided on the inner wall of the mounting groove (9). An external thread (15) matching the internal thread (10) is provided on the outer wall of one end of the screw body (3).

2. The extruder screw for producing hot melt adhesive sticks according to claim 1, characterized in that: A limiting thread (11) is provided on the outer wall of one end of the installation rod (2) away from the screw head (1), and the outer wall of the limiting thread (11) is threadedly connected to the limiting sleeve (12).

3. The extruder screw for producing hot melt adhesive sticks according to claim 1, characterized in that: The outer walls of the feed section (4) and the discharge section (6) are both fixedly connected with a plurality of evenly distributed spiral sheets (7).

4. The extruder screw for producing hot melt adhesive sticks according to claim 1, characterized in that: A plurality of evenly distributed crushing convex particles (8) are fixedly connected to the outer wall of the crushing section (5).

5. The extruder screw for producing hot melt adhesive sticks according to claim 1, characterized in that: A mounting head (13) is fixedly connected to the side of the screw head (1) away from the mounting rod (2), and a mounting hole (14) is provided on the outer wall of the mounting head (13).

6. The extruder screw for producing hot melt adhesive sticks according to claim 1, characterized in that: The wall thickness of the screw body (3) matches the groove width of the mounting groove (9).

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