A glue melting cylinder for injection molding machine

Abstract

The present application relates to injection molding machine technical field, especially injection molding machine with melt glue cylinder. Melt glue cylinder includes cylinder and nozzle installed at the end of the cylinder, the cylinder is provided with feeding hole along the axial direction, the cylinder is provided with the center of the cylinder along the axial direction The discharge port is communicated with the feeding hole. The cylinder includes two cylinder segments which are symmetrically arranged at the center of the discharge port, the end of the cylinder segment away from the discharge port is provided with a mounting hole, the two ends of the feeding hole are communicated with the mounting hole, and the nozzle can be installed in the mounting hole. By setting the cylinder into two symmetrical cylinder segments, both cylinder segments have feeding function. During the feeding process, when one of the cylinder segments is worn out as a feeding cylinder, the two cylinder segments are exchanged, and the other cylinder segment is used as a feeding cylinder, realizing the secondary use of the cylinder, prolonging the service life of the melt glue cylinder, avoiding frequent replacement of the cylinder, and reducing the production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding machines, in particular to a glue melting cylinder for an injection molding machine. BACKGROUND

[0002] The injection molding machine is also called injection molding machine or injection machine, which is the main molding equipment for making various shape plastic products by using thermoplastic or thermosetting plastics and plastic molding mold. At present, the widely used is screw extruder, the plastic is heated in the glue melting cylinder of the injection molding machine, the high pressure is applied to the molten plastic by the rotation of the screw, so that the molten plastic is shot out from the nozzle at the front end of the glue melting cylinder to fill the mold cavity.

[0003] At present, the glue melting cylinder for injection molding machine on the market will be worn only in the front half part of the screw flight and the inner wall of the glue melting cylinder after being used for a period of time, and the rear half part of the glue melting cylinder will not be worn basically. Under the mutual friction of the plastic and the screw, the wear amount of the inner wall of the glue melting cylinder will gradually increase, so that the gap between the glue melting cylinder and the screw is increased, which affects the molding precision of the plastic products. In order to ensure the quality of injection molding, a new glue melting cylinder needs to be replaced, and the glue melting cylinder is generally made of alloy material with wear resistance and corrosion resistance, which greatly increases the production cost. SUMMARY

[0004] The purpose of the present application is to provide a glue melting cylinder for an injection molding machine, so as to realize the secondary use of the glue melting cylinder, prolong the service life of the glue melting cylinder and reduce the production cost.

[0005] In order to achieve this purpose, the technical scheme adopted by the present application is:

[0006] The glue melting cylinder comprises a cylinder body and a nozzle installed at the end of the cylinder body, the cylinder body is provided with a feeding hole penetrating along the axial direction, and the cylinder body is provided with a discharging port communicating with the feeding hole at the center position along the axial direction;

[0007] The cylinder body comprises two cylinder segments symmetrically arranged at the center of the discharging port, the end of the cylinder segment away from the discharging port is provided with a mounting hole, the two ends of the feeding hole communicate with the mounting hole, and the nozzle can be installed in the mounting hole.

[0008] As a preferred scheme, the cylinder body is fixed on the fixed seat, and the glue melting cylinder further comprises a locking piece, and the locking piece locks the cylinder body on the fixed seat.

[0009] As a preferred scheme, the outer periphery of the cylinder segment is provided with a stepped surface around the circumference, the end of the cylinder segment with the mounting hole has an external thread, and the locking piece is threadedly connected with the cylinder segment installed on the fixed seat, so that the stepped surface abuts against the fixed seat.

[0010] As a preferred solution, the glue melting cylinder further comprises a sleeve, which is sleeved on the cylinder segment, and the sleeve is clamped between the fixing base and the locking member.

[0011] As a preferred solution, the glue melting cylinder further comprises a cooling ring, which is detachably sleeved on one end of the cylinder segment.

[0012] As a preferred solution, the cooling ring is made of aluminum.

[0013] As a preferred solution, the cooling ring is provided with a cutout penetrating through both axial ends, so that the cooling ring is an open ring; the glue melting cylinder further comprises a fastener, which can lock the cooling ring, so that the cooling ring tightly embraces the cylinder segment.

[0014] As a preferred solution, the cooling ring is provided with a plurality of cooling flow channels in the circumferential direction, each of which extends in the axial direction of the cooling ring, and the plurality of cooling flow channels are sequentially connected into an S-shaped flow channel.

[0015] As a preferred solution, the cooling ring comprises:

[0016] a main ring, which is provided with a plurality of cooling flow channels in the circumferential direction;

[0017] a pressing ring and a cover ring, both of which are coaxially and sealingly arranged at both axial ends of the main ring, and the end face of the pressing ring facing the main ring is provided with a first communication groove in the circumferential direction, and the end face of the cover ring facing the main ring is provided with a second communication groove in the circumferential direction;

[0018] the end part of the cooling flow channel close to the pressing ring and the corresponding first communication groove are in communication, and the end part of the cooling flow channel close to the cover ring and the corresponding second communication groove are in communication.

[0019] As a preferred solution, the end face of the pressing ring away from the main ring is provided with an inlet and an outlet of the S-shaped flow channel, the inlet is in communication with one of the first communication grooves, and the outlet is in communication with another of the first communication grooves.

[0020] The beneficial effects of the present application are:

[0021] The glue melting cylinder for injection molding machine has a discharging port in the axial center of the cylinder body, and the cylinder body is provided with two symmetric cylinder segments, so that both of the cylinder segments have feeding function. During the feeding process, when one of the cylinder segments is worn out, the two cylinder segments are exchanged, and the other cylinder segment is used as the feeding cylinder, so that the cylinder body is used twice, the service life of the glue melting cylinder is prolonged, the cylinder body is not replaced frequently, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of an injection molding machine provided by an embodiment of the present application;

[0023] Figure 2 is a longitudinal sectional view of a cylinder body of a glue melting cylinder provided by an embodiment of the present application;

[0024] Figure 3 is an end face view of a cooling ring provided by an embodiment of the present application;

[0025] Figure 4 is a split structure schematic diagram of a cooling ring provided by an embodiment of the present application.

[0026] The component names and numbers in the drawings are as follows:

[0027] 10, hopper; 20, nozzle; 30, screw; 40, fixed seat; 50, driving member;

[0028] 1, cylinder body; 11, feeding hole; 12, mounting hole; 13, cylinder segment; 130, stepped surface; 131, mounting segment; 132, discharging segment; 14, discharging port; 2, locking member; 3, sleeve;

[0029] 4, cooling ring; 41, main ring; 411, cooling flow channel; 412, locking hole; 42, compression ring; 421, inlet; 422, outlet; 43, cover ring; 431, second communication groove; 44, assembly hole; 45, cutout; 451, avoiding groove. DETAILED DESCRIPTION

[0030] To make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application are further described below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all.

[0031] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the present embodiment, the terms "up", "down", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The technical solutions of the present application will be further illustrated below in conjunction with the drawings and through specific embodiments.

[0035] The injection molding machine is used for molding plastic products, especially for injection molding using bakelite powder as raw material, wherein the bakelite powder is composed of phenolic resin, sawdust, hardener, curing agent, plasticizer, colorant, lubricant, curing enhancer and other additives, and is a kind of thermosetting plastic. Of course, the injection molding machine can also use other kinds of plastic raw materials for injection molding, which is not specifically limited here.

[0036] Specifically, as shown in Figure 1 The injection molding machine includes a glue melting cylinder, a hopper 10, a nozzle 20, a screw 30, a fixed seat 40 and a driving member 50. The glue melting cylinder includes a cylinder body 1, the cylinder body 1 is installed on the fixed seat 40, and the nozzle 20 is installed on the cylinder body 1 along the front and rear directions Figure 1The barrel 1 is provided with a feeding hole 11 in the axial direction, and a discharge port 14 is arranged on the barrel 1 and communicates with the feeding hole 11. The discharge port 14 is connected with the hopper 10. The hopper 10 is filled with plastic raw materials, so that the plastic raw materials enter the feeding hole 11 through the discharge port 14, and are melted by the shearing stress generated by the heating coil (not shown in the figure) arranged on the outer periphery of the glue melting barrel and the screw 30. The screw 30 is movably arranged in the glue melting barrel, and the driving member 50 is in transmission connection with the rear end of the screw 30, so as to drive the screw 30 to rotate in the feeding hole 11 of the glue melting barrel. The injection molding machine further comprises an injection oil cylinder or an injection motor (not shown in the figure) for driving the screw 30 to move forward and backward in the feeding hole 11. The screw 30 moving forward and backward applies a propelling force to the plastic raw materials in the molten state, so that the plastic raw materials in the molten state are shot out from the nozzle 20 at the front end of the glue melting barrel and fill the mold cavity.

[0037] In the embodiment, the driving member 50 is a rotary motor, which has a small volume and is convenient to install and use. In other embodiments, the driving member 50 can also be a hydraulic cylinder or other driving device, as long as it can drive the screw 30 to rotate. The front half (between the nozzle 20 and the discharge port 14) of the screw 30 in the embodiment has a screw ridge (or thread) on the outer periphery, so as to generate a rotating propelling force. The rear half (between the discharge port 14 and the driving member 50) of the screw 30 is a light shaft, also known as a non-threaded section.

[0038] In the existing injection molding machine, the wear of the glue melting barrel and the screw only occurs in the front half of the screw ridge in contact with the inner wall of the glue melting barrel, and the rear half of the glue melting barrel is basically not worn. When the wear of the inner wall of the front half of the glue melting barrel gradually increases, the gap between the glue melting barrel and the screw also increases. In order to ensure the quality of injection molding, a new glue melting barrel needs to be replaced, and the glue melting barrel is generally made of alloy material with wear resistance and corrosion resistance, which greatly increases the production cost.

[0039] To solve the above problems, the injection molding machine comprises a glue melting barrel and a screw, Figure 1 and Figure 2As shown, the barrel body 1 of the glue melting barrel of the embodiment is provided with a discharging port 14 in the center of the barrel body 1 in the axial direction and in communication with the feeding hole 11. The barrel body 1 includes two barrel segments 13 symmetrically arranged in the center of the discharging port 14, and the end of the barrel segment 13 away from the discharging port 14 is provided with a mounting hole 12. The two ends of the feeding hole 11 are in communication with the mounting hole 12, and the nozzle 20 can be mounted in the mounting hole 12. By providing the discharging port 14 in the center of the barrel body 1 in the axial direction and arranging the barrel body 1 into two barrel segments 13 with symmetrical structure, both of the barrel segments 13 have feeding function. During the feeding process, when one of the barrel segments 13 is worn out greatly as the feeding barrel, the two barrel segments 13 are exchanged, and the other barrel segment 13 is used as the feeding barrel, so that the barrel body 1 is used twice, the service life of the glue melting barrel is prolonged, the barrel body 1 is not replaced frequently, and the production cost is reduced.

[0040] As shown in Figure 2 , the barrel body 1 is divided into two equal-length barrel segments 13 with the same structure by the center line of the discharging port 14 as the boundary. The two barrel bodies 1 are integrally formed, and the size, material and the like of the two barrel segments 13 are the same, so that the nozzle 20, the heating component and the like can be mounted on each barrel segment 13. For example, the mounting hole 12 is formed in the two ends of the barrel body 1 in the axial direction, and the nozzle 20 is detachably mounted in the mounting hole 12 of the barrel segment 13 in front by a flange.

[0041] When the first barrel body 1 is used, the first barrel body 1 is located in front, and the second barrel body 1 is fixedly mounted on the fixed seat 40. The nozzle 20 is mounted in the mounting hole 12 of the first barrel body 1, and the rear end of the screw rod 30 extends out of the second barrel body 1 and is in transmission connection with the driving member 50. When the inner wall of the first barrel body 1, i.e. the hole wall part of the feeding hole 11 corresponding to the first barrel body 1, is worn out greatly, the barrel body 1 is disassembled, the two barrel segments 13 are exchanged, the second barrel body 1 is located in front, and the first barrel body 1 is fixedly mounted on the fixed seat 40. The nozzle 20 is disassembled and mounted in the mounting hole 12 of the second barrel body 1, and the rear end of the screw rod 30 extends out of the first barrel body 1 and is in transmission connection with the driving member 50.

[0042] As shown in Figure 2 , the barrel body 1 is fixed on the fixed seat 40, and the glue melting barrel further includes a locking member 2 for locking the barrel body 1 on the fixed seat 40. Specifically, one barrel segment 13 is selectively mounted on the fixed seat 40, and the locking member 2 is in movable cooperation with the barrel segment 13 on the fixed seat 40 to lock the barrel segment 13 on the fixed seat 40. By providing the locking member 2, the connection strength and stability of the barrel segment 13 and the fixed seat 40 are improved.

[0043] As shown in Figure 1 and Figure 2As shown, the outer periphery of the cylinder segment 13 is provided with a stepped surface 130 in the circumferential direction, and the end of the cylinder segment 13 with the mounting hole 12 is provided with external threads. The locking member 2 is threadedly connected with the cylinder segment 13 mounted on the fixing seat 40, so that the stepped surface 130 abuts against the fixing seat 40. The locking member 2 of the present embodiment is a fixed flange, the cylinder segment 13 at the rear end penetrates through the fixing seat 40 and comes out of the fixing seat 40, and one side of the fixing seat 40 abuts against the stepped surface 130 of the cylinder segment 13. The fixed flange is screwed on the external threaded portion of the cylinder segment 13 coming out of the fixing seat 40, so that the fixed flange and the stepped surface 130 jointly clamp the fixing seat 40, to stably mount the cylinder segment 13 at the rear end on the fixing seat 40. The quick detachable mounting of the cylinder segment 13 on the fixing seat 40 is realized in a threaded manner, which improves the dismounting efficiency and stability of the cylinder body 1.

[0044] Specifically, the cylinder segment 13 comprises a mounting segment 131 and a material discharging segment 132 coaxially connected, and the two material discharging segments 132 are connected as a whole and form a material discharging segment. The outer diameter of the mounting segment 131 is smaller than that of the material discharging segment 132, so as to form the stepped surface 130 between the mounting segment 131 and the material discharging segment 132. The material discharging segment is provided with a material discharging opening 14 at the middle position in the axial direction, and the lower end of the hopper 10 is inserted into the material discharging opening 14 of the material discharging segment.

[0045] Further, as shown in Figure 1 The glue melting cylinder further comprises a sleeve 3, which is sleeved on the cylinder segment 13 and clamped between the fixing seat 40 and the locking member 2. Since the length of the mounting segment 131 is relatively long, when the cylinder segment 13 at the rear end penetrates through the fixing seat 40, the locking member 2 abuts against the fixing seat 40 through the sleeve 3, without the need to open the external threads of the cylinder segment 13 to the position where the fixing seat 40 is located, which reduces the machining length of the external threads, so that the locking member 2 can be quickly screwed, greatly shortens the screwing length of the locking member 2, and is beneficial to improve the mounting efficiency of the glue melting cylinder.

[0046] In the injection molding machine, the mounting segment 131 of the cylinder segment 13 at the front is sleeved with a heating component to heat the bakelite powder or other plastic raw materials in the feeding hole 11. In order to avoid the premature melting of the bakelite powder or other plastic raw materials entering from the material discharging opening 14, and to ensure the good fluidity of the bakelite powder or other plastic raw materials, as Figure 3As shown, the glue melting cylinder further comprises a cooling ring 4 which is detachably sleeved on one end of the cylinder segment 13. Specifically, the cooling ring 4 is sleeved on the end of the cylinder segment 13 close to the discharging port 14, so as to reduce the temperature rise of the end of the cylinder segment 13 close to the discharging port 14. The cooling ring 4 is sleeved on the discharging segment 132 of the cylinder segment 13 close to the discharging port 14, so that the temperature of the area near the discharging port 14 is kept within a suitable range, avoiding the melting of bakelite powder or other plastic raw materials in the area near the discharging port 14. By adding the cooling ring 4, the cooling of the discharging segment 132 is achieved, without the need to turn a ring groove on the outer circumferential surface of the cylinder body 1 and weld a sleeve structure to form a cooling flow channel, thereby reducing the processing difficulty of the cylinder body 1, and the cooling ring 4 can be flexibly adjusted in position and number according to the cooling requirement.

[0047] As shown in Figure 3 and Figure 4 The cooling ring 4 is provided with a cutout 45 extending through both axial ends, so that the cooling ring 4 is an open ring. The glue melting cylinder further comprises fasteners which can lock the cooling ring 4 to make the cooling ring 4 tightly embrace the cylinder segment 13. Specifically, the fasteners are bolts or screws, the cooling ring 4 is a C-shaped clamp structure, and the cooling ring 4 has a cutout 45 between the two circumferential ends. A plurality of locking holes 412 are formed on one end of the cooling ring 4, and a same number of threaded holes are formed on the other end. The fasteners are respectively arranged in the locking holes 412 and extend into the corresponding threaded holes to achieve threaded connection. By tightening the fasteners, the inner diameter of the cooling ring 4 is reduced, so that the cooling ring 4 tightly embraces the cylinder segment 13 at the front end, and the stable installation of the cooling ring 4 is achieved. Moreover, the cooling ring 4 can be sleeved on cylinder segments 13 with different outer diameters, and has a certain universality.

[0048] The locking holes 412 of the present embodiment have three, and the corresponding threaded holes and fasteners are also three. In other embodiments, the number of locking holes 412 can also be one, two or more than four, and the number of threaded holes and fasteners matches the number of locking holes 412.

[0049] Further, the cutout 45 of the cooling ring 4 is provided with an avoiding groove 451, so as to facilitate the installation of a temperature measuring thermocouple in the avoiding groove 451, so that the temperature measuring thermocouple can directly contact the cylinder body 1 through the avoiding groove 451 to monitor the temperature of the cylinder body 1 near the discharging port 14 in real time.

[0050] It should be noted that the cooling ring 4 cools the barrel 1 by liquid cooling, and the cooling liquid can be water or oil, etc. The cooling ring 4 is in communication with a component that stores the cooling liquid externally, so as to introduce the cooling liquid into the cooling ring 4. Specifically, a plurality of cooling flow channels 411 are arranged circumferentially in the cooling ring 4, each cooling flow channel 411 extends along the axial direction of the cooling ring 4, and the plurality of cooling flow channels 411 are sequentially connected into an S-shaped flow channel. The cooling liquid circulates along the S-shaped flow channel, which prolongs the flow length of the cooling liquid in the cooling ring 4 and improves the cooling effect of the cooling ring 4. Of course, the cooling ring 4 can also be provided with a C-shaped flow channel, a U-shaped flow channel or other different shapes of flow channels, as long as it can meet the cooling requirements of the cooling ring 4.

[0051] As shown in Figure 4 , the cooling ring 4 includes a main ring 41, a compression ring 42 and a cover ring 43, and a plurality of cooling flow channels 411 are arranged circumferentially in the main ring 41. The two ends of the main ring 41 in the axial direction are coaxially and sealingly provided with the compression ring 42 and the cover ring 43. The cooling ring 4 is provided in a split structure, which facilitates the machining of the cooling flow channels 411.

[0052] Specifically, the main ring 41, the compression ring 42 and the cover ring 43 are all circumferentially provided with a plurality of assembly holes 44, and the assembly holes 44 of the main ring 41, the compression ring 42 and the cover ring 43 are coaxially arranged and sequentially threaded by bolts, so as to assemble the main ring 41, the compression ring 42 and the cover ring 43 into the cooling ring 4. When the cooling ring 4 is assembled, sealing glue is applied between the main ring 41 and the compression ring 42 and between the main ring 41 and the cover ring 43 to achieve good sealing between the main ring 41 and the compression ring 42 and between the main ring 41 and the cover ring 43, so as to prevent the cooling liquid from leaking.

[0053] As shown in Figure 4 , the end face of the compression ring 42 facing the main ring 41 is circumferentially provided with a first communication groove, and the end face of the cover ring 43 facing the main ring 41 is circumferentially provided with a second communication groove 431. The end of the cooling flow channel 411 close to the compression ring 42 is in communication with the corresponding first communication groove, and the end of the cooling flow channel 411 close to the cover ring 43 is in communication with the corresponding second communication groove 431.

[0054] Specifically, the first and second communication grooves 431 of the embodiment are arranged in a staggered manner, and any three adjacent cooling flow channels 411 are defined as a first flow channel, a second flow channel and a third flow channel, respectively, and the second flow channel is located between the first flow channel and the third flow channel. The first flow channel and the second flow channel are communicated with the same first communication groove on the pressing ring 42 at one end of the main ring 41 close to the pressing ring 42, and the first flow channel and the second flow channel are communicated with two second communication grooves 431 on the cover ring 43 at one end of the main ring 41 close to the cover ring 43, respectively. The second flow channel and the third flow channel are communicated with two first communication grooves on the pressing ring 42 at one end of the main ring 41 close to the pressing ring 42, and the second flow channel and the third flow channel are communicated with the same second communication groove 431 on the cover ring 43 at one end of the main ring 41 close to the cover ring 43, so that the three adjacent cooling flow channels 411 are communicated to form an S shape, respectively. By analogy, the plurality of cooling flow channels 411 form S-shaped flow channels in the above-mentioned communication mode.

[0055] Further, the end surface of the pressing ring 42 away from the main ring 41 is provided with an inlet 421 and an outlet 422 of the S-shaped flow channel, the inlet 421 is communicated with one of the first communication grooves, and the outlet 422 is communicated with the other first communication groove. The inlet 421 and the outlet 422 of the pressing ring 42 are respectively communicated with the components storing the cooling liquid outside, so that the cooling liquid flows into the S-shaped flow channel through the inlet 421, and flows back into the components storing the cooling liquid from the outlet 422, realizing the circulating cooling of the cooling liquid.

[0056] The injection molding machine of the embodiment includes the glue melting cylinder described above, a discharge port 14 is arranged at the axial center of the cylinder body 1, and the cylinder body 1 is arranged as two structure-symmetrical cylinder segments 13, so that both of the cylinder segments 13 have the feeding function. When one of the cylinder segments 13 is worn out as a feeding cylinder, the two cylinder segments 13 are exchanged, and the other cylinder segment 13 is used as a feeding cylinder, realizing the secondary use of the cylinder body 1, prolonging the service life of the glue melting cylinder, avoiding frequent replacement of the cylinder body 1, and reducing the production cost.

[0057] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A glue pot for injection molding machines, characterized in that, The melt glue cylinder comprises a barrel (1) and a nozzle (20) mounted on the end of the barrel (1), the barrel (1) is provided with a feeding hole (11) penetrating through the barrel (1) along the axial direction, and the barrel (1) is provided with a discharging port (14) communicating with the feeding hole (11) at the central position along the axial direction; The barrel (1) comprises two barrel segments (13) symmetrically arranged at the center of the discharging port (14), so that when one of the barrel segments (13) is worn out, the two barrel segments (13) are transposed, and the other barrel segment (13) is used as the feeding barrel; the end of the barrel segment (13) away from the discharging port (14) is provided with a mounting hole (12), the two ends of the feeding hole (11) communicate with the mounting hole (12), and the nozzle (20) can be mounted in the mounting hole (12).

2. The glue pot for injection molding machines according to claim 1, characterized in that, The barrel (1) is fixed on a fixed seat (40), and the melt glue cylinder further comprises a locking member (2) for locking the barrel (1) on the fixed seat (40).

3. The glue pot for injection molding machines according to claim 2, characterized in that, The outer periphery of the barrel segment (13) is provided with a stepped surface (130) in the circumferential direction, the end of the barrel segment (13) with the mounting hole (12) is provided with external threads, and the locking member (2) is threadedly connected with the barrel segment (13) mounted on the fixed seat (40), so that the stepped surface (130) abuts against the fixed seat (40).

4. The glue pot for injection molding machines according to claim 2, wherein The melt glue cylinder further comprises a sleeve (3), the sleeve (3) is sleeved on the barrel segment (13), and the sleeve (3) is clamped between the fixed seat (40) and the locking member (2).

5. The glue pot for injection molding machines according to claim 1, wherein The melt glue cylinder further comprises a cooling ring (4), and the cooling ring (4) is detachably sleeved on one end of the barrel segment (13).

6. The glue pot for injection molding machines according to claim 5, characterized in that, The cooling ring (4) is made of aluminum.

7. The glue pot for injection molding machines according to claim 5, wherein The cooling ring (4) is provided with a cutout (45) penetrating through the two ends in the axial direction, so that the cooling ring (4) is an open ring, and the melt glue cylinder further comprises a fastener capable of locking the cooling ring (4), so that the cooling ring (4) tightly holds the barrel segment (13).

8. The glue pot for injection molding machines according to claim 5, wherein The cooling ring (4) is provided with a plurality of cooling flow channels (411) in the circumferential direction, each of the cooling flow channels (411) extends along the axial direction of the cooling ring (4), and the plurality of cooling flow channels (411) are sequentially connected into an S-shaped flow channel.

9. The glue pot for injection molding machines according to claim 8, characterized in that, The cooling ring (4) comprises: a main ring (41), the main ring (41) is provided with a plurality of cooling flow channels (411) in the circumferential direction; a pressing ring (42) and a cover ring (43), the two ends of the main ring (41) in the axial direction are coaxially and sealingly provided with the pressing ring (42) and the cover ring (43), respectively, a first communication groove is formed in the end face of the pressing ring (42) facing the main ring (41) in the circumferential direction, and a second communication groove (431) is formed in the end face of the cover ring (43) facing the main ring (41) in the circumferential direction; The cooling flow channel (411) is communicated with the first communication groove corresponding to the end of the adjacent cooling flow channel (411) close to the compression ring (42), and is communicated with the second communication groove (431) corresponding to the end of the adjacent cooling flow channel (411) close to the cover ring (43).

10. The glue pot for injection molding machines according to claim 9, wherein The end surface of the compression ring (42) away from the main body ring (41) is provided with an inlet (421) and an outlet (422) of the S-shaped flow channel, the inlet (421) is communicated with one of the first communication grooves, and the outlet (422) is communicated with the other first communication groove.

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