Material blocking device for cleaning screw rod of injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, and discloses a material blocking device for cleaning a screw of an injection molding machine, which comprises a head plate, a mold arranged on one side of the head plate and an extrusion system positioned on the other side of the head plate, the extrusion system comprises a charging barrel and a nozzle arranged at the end part of the charging barrel, and a blocking piece for blocking the nozzle is arranged on one side, close to the mold, of the charging barrel. According to the material blocking device for cleaning the screw rod of the injection molding machine, the blocking piece can replace a mold to form a shield in front of the nozzle of the charging barrel, so that when the screw rod of the injection molding machine is cleaned through a cleaning material, the other side of the head plate can synchronously carry out mold replacement operation, and the operation efficiency is improved. Therefore, the die changing period is shortened and the production efficiency is improved. The driving mechanism drives the blocking piece to contract, so that the blocking of the nozzle and the charging barrel can be cancelled, the charging barrel can smoothly enter the knockout hole of the head plate and is in butt joint with the injection hole of the mold, and the injection of the extrusion system can be normally operated.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a material blocking device for cleaning a screw of an injection molding machine. Background Art

[0002] like Figures 1 to 4 As shown, the existing injection molding machine is mainly composed of a frame 17, a head plate 1 installed above the frame 17, and an extrusion system 3 and a mold 2 arranged on the front and rear sides of the head plate 1. Among them, the mold 2 is locked on one side of the head plate 1, and the plate surface of the head plate 1 is penetrated with a punching hole 9 to dock with the injection hole 8 of the mold 2. The injection molding machine extrusion system 3 is mainly composed of a barrel 4 and a screw (not shown). The screw (not shown) is an important component of the injection molding machine. It can transport, compact, melt, stir and pressurize plastics. All these procedures are completed by the rotation of the screw (not shown) in the barrel 4. When the screw rotates, the plastic will generate friction and mutual movement with the inner wall of the barrel 4, the bottom surface of the screw groove, the propulsion surface of the screw ridge, and between the plastics. The forward propulsion of the plastic is the result of this combination of movements, and the heat generated by the friction is also absorbed to increase the temperature of the plastic to melt the plastic. For example, the utility model disclosed in the announcement number CN2759759Y is a similar injection molding machine extrusion system 3.

[0003] When the injection molding machine is injecting material, the injection seat 16 moves forward to drive the barrel 4 into the punching hole 9, so that the nozzle 5 on the barrel 4 docks with the injection hole 8 of the mold 2, and then the plastic in the barrel 4 is injected into the mold 2 through the screw (not shown).

[0004] The above-mentioned injection molding machine extrusion system 3, when changing the color or material of the plastic, needs to clean the screw with a screw cleaning material in order to remove the stored material in the barrel 4. The screw cleaning material is mainly a mixture of plastic powder, additives and other materials. When in use, first control the injection seat 16 to retreat to drive the nozzle 5 of the barrel 4 to move to the vicinity of the opening of the punching hole 9 away from the mold 2. Then, the screw cleaning material is injected into the feed hopper of the injection molding machine, and the machine is turned on for heating. After the barrel 4 is heated to the specified temperature, the screw (not shown) is fed to run the cleaning material to the full material level to start screw cleaning. During the cleaning process, the cleaning material is continuously ejected from the nozzle 5 and enters the punching hole 9. Due to the shielding effect of the mold 2, the cleaning material will not pass through the head plate 1 through the punching hole 9, but will gather on the inner wall of the punching hole 9. In this way, not only can the cleaning difficulty of the injection molding machine be reduced, but also the high-temperature cleaning material ejected can be prevented from damaging the structure and circuit behind the head plate 1. Therefore, when the extrusion system 3 is cleaning the screw, the mold changing operation cannot be performed synchronously. In situations where the mold changing frequency is high, the mold changing cycle will be lengthened, affecting production efficiency, so there is room for improvement. Utility Model Content

[0005] The utility model aims at the shortcomings of the prior art and provides a material blocking device for cleaning the screw of an injection molding machine. The blocking member can replace the mold to form a shield in front of the nozzle of the barrel, so that the mold change operation can be carried out synchronously when the screw of the injection molding machine is being cleaned, thereby shortening the mold change cycle and improving production efficiency.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A material blocking device for cleaning the screw of an injection molding machine comprises a head plate, a mold installed on one side of the head plate, and an extrusion system located on the other side of the head plate, the extrusion system comprises a barrel and a nozzle arranged at the end of the barrel, a baffle for blocking the nozzle is arranged on the side of the barrel close to the mold, and a driving mechanism for driving the baffle to contract to cancel the nozzle blocking is arranged on the head plate.

[0008] With the above solution, the baffle can replace the mold to form a shield in front of the nozzle of the barrel, so that when the screw of the injection molding machine is cleaned by the cleaning material, the other side of the head plate can be synchronously changed, thereby shortening the mold change cycle and improving production efficiency. The baffle is driven by the drive mechanism to shrink, which can cancel the shielding of the nozzle and the barrel, so that the barrel can smoothly enter the punching hole of the head plate and complete the docking with the injection hole of the mold, so that the injection of the extrusion system can operate normally.

[0009] Preferably, the head plate has a material injection hole for docking with the mold and a punching hole through which the barrel can slide. When the driving mechanism drives the baffle to extend, the baffle can tilt into the punching hole to block the nozzle.

[0010] With the above solution, the punching hole can be used as a passage for the barrel to pass through the head plate so that the nozzle can be docked with the injection hole of the mold. The blocking member is inclined to enter the punching hole, which can not only form a horizontal shield for the nozzle of the barrel, but also allow the lower end of the blocking member to be located in the punching hole, so that most of the cleaning material sprayed to the blocking member can slide along the blocking member and gather on the inner wall of the punching hole, and will not be directly blocked outside the punching hole, thereby saving the trouble of workers cleaning the outer space of the head plate.

[0011] Preferably, the barrier is in the shape of a plate, and its plate surface is arranged along its own expansion and contraction direction.

[0012] By adopting the above solution, the plate-shaped baffle can not only shield the cleaning material, but also effectively reduce the volume and weight of the baffle itself, thereby reducing the burden on the driving mechanism and improving the driving efficiency.

[0013] Preferably, a barrier portion vertically extends from the lower end of the barrier member.

[0014] By adopting the above scheme, the barrier part can not only supplement the shielding area of ​​the barrier, but also change the direction of the cleaning material sprayed on the barrier, so that the cleaning material can fall vertically to the inner wall of the punching hole, further improving the shielding effect of the barrier.

[0015] Preferably, the driving mechanism comprises a cylinder arranged on a side of the head plate away from the mold, and a push rod of the cylinder is connected to the baffle.

[0016] By adopting the above solution, the cylinder is easy to install and has low cost. It can quickly drive the barrier to extend and retract and ensure the extension and retraction accuracy.

[0017] Preferably, the driving mechanism further comprises a mounting frame connected between the cylinder and the head plate.

[0018] By adopting the above solution, the mounting frame can not only improve the convenience and stability of the cylinder installation, but also customize the shape of the mounting frame according to the required installation position and angle of the cylinder, which is more user-friendly.

[0019] Preferably, a storage groove for the barrier member to enter and exit is provided on the side of the mounting frame close to the cylinder.

[0020] By adopting the above solution, the storage groove can not only prevent the barrier from being obstructed by the mounting frame when it shrinks, but also effectively reduce the space occupied by the driving mechanism, which is more humane.

[0021] Preferably, a heat dissipation groove connected to the storage groove is provided on the upper surface of the mounting frame.

[0022] By adopting the above scheme, since the temperature of the cleaning material sprayed on the barrier is relatively high, when the barrier shrinks in the storage groove, the heat dissipation groove can help the barrier to dissipate heat quickly to prevent the barrier from being damaged or deformed due to being in a high temperature state for a long time, thereby extending the service life of the barrier.

[0023] The utility model has significant technical effects due to the adoption of the above technical solutions: the baffle can replace the mold to form a shield in front of the nozzle of the barrel, so that when the screw of the injection molding machine is cleaned by the cleaning material, the other side of the head plate can synchronously perform the mold change operation, thereby shortening the mold change cycle and improving production efficiency. The baffle is driven by the driving mechanism to shrink, which can cancel the shielding of the nozzle and the barrel, so that the barrel can smoothly enter the punching hole of the head plate and complete docking with the injection hole of the mold, so that the injection of the extrusion system can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure diagram of the injection molding machine in the prior art is shown in FIG. Figure 1 ;

[0025] Figure 2 for Figure 1 An enlarged schematic diagram of section A is shown;

[0026] Figure 3 The structure diagram of the injection molding machine in the prior art is shown in FIG. Figure 2 ;

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of portion B is shown;

[0028] Figure 5 This is a schematic diagram of the structure of the barrier member in the extended state in this embodiment;

[0029] Figure 6 for Figure 5 An enlarged schematic diagram of section C is shown;

[0030] Figure 7 This is a schematic diagram of the structure of the barrier member in the present embodiment in a retracted state;

[0031] Figure 8 for Figure 7 An enlarged schematic diagram of the D portion shown;

[0032] Fig. 9 Schematic diagram of the structure of the driving mechanism in this embodiment.

[0033] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Head plate; 2. Mold; 3. Extrusion system; 4. Barrel; 5. Nozzle; 6. Baffle; 7. Driving mechanism; 8. Injection hole; 9. Punching hole; 10. Baffle; 11. Cylinder; 12. Push rod; 13. Mounting frame; 14. Storage slot; 15. Heat dissipation slot; 16. Injection seat; 17. Frame. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] like Figures 5 to 9As shown, the present embodiment discloses a material blocking device for cleaning the screw of an injection molding machine, comprising a head plate 1, a mold 2 mounted on one side of the head plate 1, and an extrusion system 3 located on the other side of the head plate 1. The plate surface of the head plate 1 is penetrated with an injection hole 8 for docking with the mold 2 and a punching hole 9 for the barrel 4 to slide through. The extrusion system 3 comprises a barrel 4 and a nozzle 5 arranged at the end of the barrel 4. A baffle 6 for blocking the nozzle 5 is arranged on the side of the barrel 4 close to the mold 2, and a driving mechanism 7 for driving the baffle 6 to shrink to cancel the blocking of the nozzle 5 is arranged on the head plate 1. Specifically, the driving mechanism 7 comprises a cylinder 11 with a guide rod arranged on the side of the head plate 1 away from the mold 2 and located above the punching hole 9, and a push rod 12 of the cylinder 11 is arranged downward and fixedly connected to the baffle 6. The driving mechanism 7 also comprises a mounting frame 13 connected between the cylinder 11 and the head plate 1, and a storage groove 14 for the baffle 6 to enter and exit is opened on the side of the mounting frame 13 close to the cylinder 11. The upper surface of the mounting frame 13 is provided with a heat dissipation groove 15 connected to the storage groove 14 to improve the heat dissipation performance of the barrier member 6 contracted in the storage groove 14, thereby preventing the barrier member 6 from being damaged or deformed due to being in a high temperature state for a long time, thereby extending the service life of the barrier member 6.

[0036] In order to make most of the cleaning material sprayed on the baffle 6 gather on the inner wall of the punching hole 9, the cylinder 11 and its push rod 12 are tilted toward the punching hole 9. When the push rod 12 of the cylinder 11 is extended, the push rod 12 can tilt into the punching hole 9, thereby driving the baffle 6 to tilt into the punching hole 9 to block the nozzle 5.

[0037] In order to improve the shielding effect of the barrier 6 and reduce its volume and weight, the barrier 6 is plate-shaped, and its plate surface is arranged along its own expansion direction. A barrier portion 10 vertically extends from the lower end of the barrier 6, and the barrier portion 10 is also plate-shaped and integrally connected to the barrier 6.

[0038] The specific working process is as follows:

[0039] When the injection molding machine is injecting material, the cylinder 11 drives the baffle 6 to retract upwards through the push rod 12. When the baffle 6 enters the receiving groove 14, the baffle 6 can remove the shielding of the barrel 4. At this time, the injection seat 16 moves forward to drive the barrel 4 into the punching hole 9, so that the nozzle 5 on the barrel 4 docks with the injection hole 8 of the mold 2, and then the plastic in the barrel 4 is injected into the mold 2 through the screw (not shown).

[0040] When the screw of the injection molding machine (not shown) needs to be cleaned, the injection seat 16 is first controlled to retreat to drive the nozzle 5 of the barrel 4 to move to the vicinity of the opening of the punching hole 9 away from the mold 2, so that a gap can be created between the nozzle 5 of the barrel 4 and the opening of the punching hole 9 for the barrier 6 to enter. Then, the push rod 12 of the cylinder 11 extends to drive the barrier 6 to obliquely enter the punching hole 9. When the barrier 6 moves to the center position of the punching hole 9, the push rod 12 of the cylinder 11 hovers, so that the barrier 6 forms a shield in front of the nozzle 5 of the barrel 4. Next, the screw cleaning material is injected into the feed hopper (not shown) of the injection molding machine, and the machine is turned on for heating. After the barrel 4 is heated to the specified temperature, the screw (not shown) is fed to run the cleaning material to the full material level to start screw cleaning. During the cleaning process, the cleaning material is continuously ejected from the nozzle 5 and enters the punching hole 9. At this time, due to the shielding effect of the baffle 6, the sprayed cleaning material cannot enter the rear space of the head plate 1 through the punching hole 9, but falls vertically along the plate-shaped baffle 6 and the baffle 10 to the inner wall of the punching hole 9, thereby reducing the cleaning difficulty of the staff. In this state, the staff can simultaneously perform the mold change operation on the other side of the head plate 1, thereby shortening the mold change cycle and improving production efficiency.

[0041] When the screw (not shown) is cleaned, the cylinder 11 controls the barrier 6 to shrink through the push rod 12 to drive the barrier 6 to move into the receiving groove 14. At this time, the barrier 6 in the receiving groove 14 can dissipate heat through the heat dissipation groove 15 to extend the service life of the barrier 6.

[0042] The above process can be realized with the help of the built-in control program of the PLC, which is common knowledge in the field and will not be elaborated here.

Claims

1. A material blocking device for cleaning a screw of an injection molding machine, comprising a head plate (1), a mold (2) mounted on one side of the head plate (1), and an extrusion system (3) located on the other side of the head plate (1), the extrusion system (3) comprising a barrel (4) and a nozzle (5) arranged at the end of the barrel (4), characterized in that: A blocking member (6) for blocking the nozzle (5) is arranged on one side of the barrel (4) close to the mold (2), and a driving mechanism (7) for driving the blocking member (6) to contract to cancel the blocking of the nozzle (5) is arranged on the head plate (1).

2. A material blocking device for cleaning the screw of an injection molding machine according to claim 1, characterized in that: The head plate (1) is penetrated by a material injection hole (8) for docking with the mold (2) and a material punching hole (9) through which the barrel (4) can slide and pass. When the driving mechanism (7) drives the baffle (6) to extend, the baffle (6) can tilt into the material punching hole (9) to block the nozzle (5).

3. A material blocking device for cleaning the screw of an injection molding machine according to claim 1 or 2, characterized in that: The barrier member (6) is in the shape of a plate, and its plate surface is arranged along its own expansion and contraction direction.

4. A material blocking device for cleaning the screw of an injection molding machine according to claim 1 or 2, characterized in that: A barrier portion (10) vertically extends from the lower end of the barrier member (6).

5. A material blocking device for cleaning the screw of an injection molding machine according to claim 1 or 2, characterized in that: The driving mechanism (7) comprises a cylinder (11) arranged on a side of the head plate (1) away from the mold (2), and a push rod (12) of the cylinder (11) is connected to the baffle (6).

6. A material blocking device for cleaning the screw of an injection molding machine according to claim 5, characterized in that: The driving mechanism (7) also includes a mounting frame (13) connected between the cylinder (11) and the head plate (1).

7. A material blocking device for cleaning the screw of an injection molding machine according to claim 6, characterized in that: A receiving groove (14) for the barrier member (6) to enter and exit is provided on the side of the mounting frame (13) close to the cylinder (11).

8. The material blocking device for cleaning the screw of an injection molding machine according to claim 7, characterized in that: The upper surface of the mounting frame (13) is provided with a heat dissipation groove (15) which is connected to the storage groove (14).

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