CN210415241U

CN210415241U - Injection molding mechanism

Info

Publication number: CN210415241U
Application number: CN201920925550.2U
Authority: CN
Inventors: 张霖; 李陆华; 容应明; 张义清; 徐梁; 史明君
Original assignee: Ningbo Yifeite Technology Co ltd
Current assignee: Ningbo Yifeite Technology Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-28
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a mechanism of moulding plastics, include motor, reducing gear box, penetrate a back plate, penetrate a front plate, penetrate gluey jar, feed cylinder and screw rod, the reducing gear box with penetrate a back plate fixed connection, the motor is connected with the reducing gear box, and the screw rod is connected with the output of reducing gear box, penetrates gluey jar and includes cylinder body, flange, first piston rod, second piston rod and penetrates gluey jar end plate, penetrate gluey piston on the first piston rod respectively with penetrate to form between gluey jar end plate and the flange and do not have the oil pocket and penetrate gluey chamber, the second piston cup joints in the cavity of first piston. Compared with a hydraulic motor, the utility model has lower cost and more stable machine performance; and in the injection molding process, the piston rod of the injection cylinder can complete reciprocating motion under the condition of small pressure, so that the reciprocating motion efficiency of the piston rod is accelerated, the loss of a machine is reduced, and the cost is reduced.

Description

Injection molding mechanism

Technical Field

The utility model relates to an injection molding mechanism belongs to mechanical equipment technical field.

Background

An injection molding machine is also known as an injection molding machine or an injection machine. It is a main forming equipment for making various shaped plastic products from thermoplastic plastics or thermosetting plastics by using plastic forming mould. The device is divided into a vertical type, a horizontal type and a full-electric type. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

Chinese patent 201610342507.4 discloses an injection molding mechanism, which is composed of a hydraulic motor as a power source, wherein the hydraulic motor has high cost and complex structure, and is easy to be damaged, and once damaged, the maintenance difficulty is high, the maintenance cost is high, and the work stability of the injection molding machine is poor.

In addition, as shown in fig. 9, in the prior art, the glue injection cylinder of the injection mechanism includes a cylinder 6 and a piston rod 5, the piston rod 5 is inserted into the cylinder 6, and a piston 51 is disposed at an end of the piston rod 5 located in the cylinder 6, a cavity 61 and a cavity 62 are formed at front and rear ends of the piston 51 and the cylinder 6, and both the cavity 61 and the cavity 62 are connected to a hydraulic pump, so that both the cavity 61 and the cavity 62 are filled with oil. During injection molding, the cavity 61 is pressurized, so that the piston 51 moves to discharge oil in the cavity 62, and when the piston rod 5 is reset, the cavity 62 is pressurized to discharge oil in the cavity 61, so that the piston 51 moves to return to the initial position. Therefore, after the piston rod 5 is reset, the residual oil in the cavity 62 is extremely large, great hydraulic pressure exists, when the piston rod 5 is pushed again, the piston rod 5 can only complete injection molding action with great pressure, the back-and-forth running speed of the piston rod of the injection cylinder is slow, the injection molding efficiency is affected, and the long-time high-pressure high-load movement has great loss to the oil cylinder and the hydraulic pump.

Disclosure of Invention

The utility model discloses a main aim at provides a mechanism of moulding plastics, the cost is lower, the operating efficiency is high and difficult loss.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an injection molding mechanism comprises a motor, a reduction gearbox, an injection platform rear plate, an injection platform front plate, an injection cylinder, a material barrel and a screw rod, wherein the reduction gearbox is fixedly connected with the injection platform rear plate, the motor is connected with the input end of the reduction gearbox, the screw rod is connected with the output end of the reduction gearbox, the screw rod penetrates through the injection platform front plate and the injection platform rear plate, the material barrel is fixedly connected to the injection platform front plate and is sleeved on the periphery of the screw rod, the injection cylinder comprises a cylinder body, a connecting flange, a first piston rod, a second piston rod and an injection cylinder end plate, the injection platform front plate is fixedly connected with the cylinder body, the injection platform rear plate is fixedly connected with the first piston rod, the injection cylinder end plate and the connecting flange are respectively and fixedly connected to two ends of the cylinder body, the second piston rod is arranged in the cylinder body and is fixedly connected with the injection cylinder end plate, a cavity is formed in the first piston rod, the first piston rod penetrates through the, and the second piston rod is inserted into the cavity of the first piston rod, the rod body of the first piston rod is sleeved with the glue injection piston, and the glue injection piston is limited in the cylinder body, so that a glue injection cavity is formed between the glue injection piston and the connecting flange.

Further, the above injection molding mechanism, wherein: the screw rod is connected with the reduction gearbox through a coupler, the injection platform rear plate comprises a screw rod cavity, the coupler is located in the screw rod cavity, the end portion of the screw rod is located in the screw rod cavity and fixedly connected with the coupler, and the other end of the coupler is connected with an output port of the reduction gearbox.

Further, the above injection molding mechanism, wherein: the connecting flange is provided with a hollow part, the first piston rod penetrates through the hollow part, the outer peripheral surface of the connecting flange is provided with an oil discharging port, and the oil discharging port is communicated with the hollow part.

Further, the above injection molding mechanism, wherein: and an oil-free cavity is formed between the glue injection piston and the glue injection cylinder end plate, an air exchange hole is formed in the glue injection cylinder end plate, and the air exchange hole is communicated with the oil-free cavity.

Still further, the above injection molding mechanism, wherein: the cavity of the first piston rod comprises a first cavity and a second cavity, the first cavity is communicated with the second cavity, the second piston rod is inserted into the second cavity, and the cross-sectional area of the second cavity is larger than that of the first cavity.

Still further, the above injection molding mechanism, wherein: the outer peripheral surface of the connecting flange is provided with a first oil inlet, a through hole is formed in the part of the end surface, located in the cylinder body, of the connecting flange, the first oil inlet is communicated with the through hole to form an oil inlet channel, and the oil inlet channel is communicated with the glue injection cavity.

Still further, the above injection molding mechanism, wherein: and a second oil inlet is formed at one end of the first piston rod, which is far away from the second piston rod, and the second oil inlet is communicated with the first cavity.

Still further, the injection molding mechanism described above, wherein: the cylinder body is characterized in that a protruding layer is formed on the end face of one side, connected with the cylinder body, of the connecting flange, threads are formed on the periphery of the protruding layer, and the protruding layer is in threaded connection with the inner wall of the cylinder body.

Still further, the injection molding mechanism described above, wherein: the through hole is formed in the end face of the protruding layer.

The utility model discloses following beneficial effect has: the utility model uses the motor and the reduction box as power sources, compared with a hydraulic motor, the cost is lower, and the machine performance is more stable; the utility model discloses at the in-process of moulding plastics, its piston rod that penetrates the jar can accomplish reciprocating motion under very little pressure condition for piston rod reciprocating motion's efficiency has reduced the loss of machine, the cost is reduced.

Drawings

FIG. 1 is a schematic view of an injection molding machine;

FIG. 2 is a schematic view of an injection molding mechanism;

FIG. 3 is a schematic view of the injection mechanism with the power plant removed;

FIG. 4 is a schematic view of a coupling;

FIG. 5 is a schematic view of a shooting pot;

FIG. 6 is another perspective view of the glue-injecting cylinder;

FIG. 7 is a schematic view of a coupling flange;

FIG. 8 is a cross-sectional view of the shooting pot;

fig. 9 is a schematic view of a prior art shooting pot.

In the figure: 1. a working platform; 2. an injection molding mechanism; 3. a mold clamping mechanism; 21. a motor; 22. a reduction gearbox; 23. a shooting table back plate; 231. a piston rod fixing cavity; 232. a screw cavity; 233. a fixing plate; 24. a front plate of the injection platform; 241. a cylinder body fixing cavity; 242. a charging barrel fixing cavity; 25. a glue injecting cylinder; 251. a cylinder body; 2511. a glue injecting cavity; 2512. no oil cavity; 252. a connecting flange; 2521. a first oil inlet; 2522. a through hole; 2523. an oil discharge port; 2524. a hollow portion; 253. a first piston rod; 2531. a first cavity; 2532. a second cavity; 2533. a second oil inlet; 2534. a glue injection piston; 254. a second piston rod; 255. injecting the glue cylinder end plate; 2551. an air exchange aperture; 26. a charging barrel; 27. a screw; 28. a coupler 281 and an accommodating cavity; 282. coupler joint.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

As shown in fig. 1 and fig. 2, the injection molding machine includes a working platform 1, an injection molding mechanism 2 and a mold clamping mechanism 3, the mold clamping mechanism 3 is fixedly connected to the working platform 1, the injection molding mechanism 2 is connected to the working platform 1 through a slide rail, and the injection molding mechanism 2 is connected to the mold clamping mechanism 3 through a charging barrel 26 of the injection molding mechanism 2.

As shown in fig. 2 and 3, the injection mechanism 2 includes a motor 21, a reduction box 22, an injection platform rear plate 23, an injection platform front plate 24, two injection cylinders 25, a material cylinder 26 and a screw 27, the injection platform rear plate 23 includes a screw cavity 232 and a piston rod fixing cavity 231, the piston rod fixing cavities 231 are two and are respectively located at the left and right sides of the screw cavity 232, the injection platform front plate includes a cylinder fixing cavity 241 and a material cylinder fixing cavity 242, the cylinder fixing cavities 241 are two and are respectively located at the left and right sides of the material cylinder fixing cavity 242, the cylinder fixing cavity 241 corresponds to the piston rod fixing cavity 231 in position, the material cylinder fixing cavity 242 corresponds to the screw cavity 232 in position, the two injection cylinders 25 are provided, the cylinder bodies 251 of the two injection cylinders 25 are fixedly connected to the cylinder fixing cavity 241 of the injection platform front plate 24, the other end of the injection cylinder 25 is connected to the piston rod fixing cavity 231, so that the injection platform front plate 24 is connected to the injection platform, the rear side of the injection platform rear plate 23 is provided with a fixing plate 233, the reduction gearbox is fixedly connected with the fixing plate 233, the motor 21 is connected with the input end of the reduction gearbox 22, the screw 27 is connected with the output end of the reduction gearbox 22, the screw 27 is positioned in the screw cavity 232 and penetrates through the material barrel fixing cavity 242, the end part of the material barrel 26 is fixedly connected to the material barrel fixing cavity 242, and the material barrel 26 is sleeved on the periphery of the screw 27.

Specifically, as shown in fig. 3 and 4, the screw 27 is connected with the reduction gearbox 22 through the coupler 28, the coupler 28 is located in the screw cavity 232, one end of the coupler 28 is provided with an accommodating cavity 281, the other end of the coupler 28 is formed with a coupler head, and an end of the screw 27 close to one side of the reduction gearbox 22 is fixedly connected in the accommodating cavity 281. Tooth marks are formed on the periphery of the coupler head 28, an accommodating cavity is formed at the output port of the reduction gearbox 22, the size of the accommodating cavity at the output port of the reduction gearbox 22 is matched with that of the coupler head, the tooth marks are formed on the inner wall of the accommodating cavity at the output port of the reduction gearbox 22, and the tooth marks at the coupler head are meshed with the tooth marks in the accommodating cavity at the output port of the reduction gearbox 22. Preferably, the motor 21 is preferably a 55W power motor or a higher power motor. The motor 21 rotates and transmits the torque to the reduction gearbox 22, the reduction gearbox 22 transmits the torque to the screw 27 to replace a hydraulic motor so that the screw 27 rotates, and the reduction gearbox 22 is used for outputting proper rotating speed and torque to the screw 27. The reduction gearbox 22 is prior art, can be purchased directly on the market, and the detailed description of the internal structure thereof is omitted.

As shown in fig. 5 to 8, the glue injecting cylinder 25 includes a cylinder 251, a connecting flange 252, a first piston rod 253, a second piston rod 254 and a glue injecting cylinder end plate 255, the glue injecting cylinder end plate 255 and the connecting flange 252 are respectively fixedly connected to two ends of the cylinder 251, the second piston rod 254 is disposed in the cylinder 251, one end of the second piston rod 254 is fixedly connected to the glue injecting cylinder end plate 255, a hollow portion 2524 is formed on the connecting flange 252, a cavity is formed inside the first piston rod 253, the first piston rod 253 penetrates through the hollow portion 2524 of the connecting flange 252 and is inserted into the cylinder 251, the other end of the second piston rod 254 is inserted into the cavity of the first piston rod 253, a glue injecting piston 2534 is sleeved on the first piston rod 253, the glue injecting piston 2534 is limited in the cylinder 251, a glue injecting cavity 2511 is formed between the glue injecting piston 2534 and the connecting flange 252, an air exchange hole 2551 is formed in the glue injection cylinder end plate 255, an oil-free cavity 2512 is formed between the glue injection piston 2534 and the glue injection cylinder end plate 255, and the air exchange hole 2551 is communicated with the oil-free cavity 2512. The glue injection cavity 2511 and the cavity in the first piston rod 253 are both communicated with a hydraulic pump.

Specifically, in order to prevent the glue injection cavity 2511 from entering the oil-free cavity 2512, the glue injection piston 2534 is tightly attached to the inner wall of the glue injection cylinder 251 through interference fit. Similarly, the second piston rod 254 is tightly attached to the cavity of the first piston rod 253 by interference fit. Preferably, the cavities of the first piston rod 253 include a first cavity 2531 and a second cavity 2532, one end of the first cavity 2531 is connected to a hydraulic pump, the other end of the first cavity 2531 is connected to one end of the second cavity 2532, the second piston rod 254 is inserted into the second cavity 2532, and the cross-sectional area of the second cavity 2532 is greater than that of the first cavity 2531. A second oil inlet 2533 is formed at the end of the first piston rod 253 far away from the second piston rod 254, the second oil inlet 2533 is communicated with the first cavity 2531 and the hydraulic pump, and the end of the first piston rod 253 far away from the second piston rod 254 is located in the piston rod fixing cavity 231.

As shown in fig. 7 and 8, a first oil inlet 2521 is formed on the outer peripheral surface of the connecting flange 252, a through hole 2522 is formed on a portion of the end surface of the connecting flange 252 located inside the cylinder block 251, the first oil inlet 2521 and the through hole 2522 are communicated to form an oil inlet channel, the oil inlet channel is communicated with the glue injection cavity 2511, and the first oil inlet 2521 is communicated with the hydraulic pump. In the process of injecting the glue, a part of the oil enters between the first piston rod 253 and the hollow portion 2524 of the connecting flange 252, and for this purpose, an oil discharge port 2523 is further disposed on the outer circumferential surface of the connecting flange 252, and the oil discharge port 2523 is communicated with the hollow portion 2524. A protruding layer is formed on the end surface of the side where the connecting flange 252 is connected to the cylinder 251, threads are formed on the outer periphery of the protruding layer, the protruding layer is in threaded connection with the inner wall of the cylinder 251, and the through hole 2522 is formed on the end surface of the protruding layer.

The working principle of the glue shooting cylinder is as follows: when the glue injection work is carried out, the oil inlet of the glue injection cavity 2511 pushes the first piston rod 253 to move, an oil-free cavity 2512 is formed between the glue injection piston 2534 and the glue injection cylinder end plate 255, and only air in the oil-free cavity 2512 needs to be extruded, so that the first piston rod 253 can be pushed only by small pressure. When the first piston rod needs to be reset, oil is introduced into the cavity of the first piston rod 253, so that the first piston rod 253 can be driven to reset. Because the volume of the cavity in the first piston rod 253 is very little, hydraulic pressure is then correspondingly very little, when doing the work of moulding plastics again, penetrates gluey chamber 2511 oil feed and promotes first piston rod 253 motion, can make the oil in the cavity in the first piston rod 253 discharge.

As can be seen from the above description, the motor and the reduction gearbox of the present invention are used as power sources, compared with a hydraulic motor, the cost is lower, and the machine performance is more stable; the utility model discloses at the in-process of moulding plastics, its piston rod that penetrates the jar can accomplish reciprocating motion under very little pressure condition for piston rod reciprocating motion's efficiency has reduced the loss of machine, the cost is reduced.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An injection molding mechanism, which is characterized in that: the injection molding machine comprises a motor, a reduction gearbox, an injection molding rear plate, an injection molding front plate, an injection molding cylinder, a charging barrel and a screw rod, wherein the reduction gearbox is fixedly connected with the injection molding rear plate, the motor is connected with the input end of the reduction gearbox, the screw rod is connected with the output end of the reduction gearbox, the screw rod penetrates through the injection molding front plate and the injection molding rear plate, the charging barrel is fixedly connected to the injection molding front plate and is sleeved on the periphery of the screw rod, the injection molding cylinder comprises a cylinder body, a connecting flange, a first piston rod, a second piston rod and an injection molding cylinder end plate, the injection molding front plate is fixedly connected with the cylinder body, the injection molding rear plate is fixedly connected with the first piston rod, the injection molding cylinder end plate and the connecting flange are respectively and fixedly connected with two ends of the cylinder body, the second piston rod is arranged in the cylinder body and is fixedly connected with the injection molding cylinder end plate, a cavity is formed in the first, and the second piston rod is inserted into the cavity of the first piston rod, the rod body of the first piston rod is sleeved with the glue injection piston, and the glue injection piston is limited in the cylinder body, so that a glue injection cavity is formed between the glue injection piston and the connecting flange.

2. The injection molding mechanism of claim 1, wherein: the screw rod is connected with the reduction gearbox through a coupler, the injection platform rear plate comprises a screw rod cavity, the coupler is located in the screw rod cavity, the end portion of the screw rod is located in the screw rod cavity and fixedly connected with the coupler, and the other end of the coupler is connected with an output port of the reduction gearbox.

3. The injection molding mechanism of claim 1, wherein: the connecting flange is provided with a hollow part, the first piston rod penetrates through the hollow part, the outer peripheral surface of the connecting flange is provided with an oil discharging port, and the oil discharging port is communicated with the hollow part.

4. The injection molding mechanism of claim 1, wherein: and an oil-free cavity is formed between the glue injection piston and the glue injection cylinder end plate, an air exchange hole is formed in the glue injection cylinder end plate, and the air exchange hole is communicated with the oil-free cavity.

5. The injection molding mechanism of claim 1, wherein: the cavity of the first piston rod comprises a first cavity and a second cavity, the first cavity is communicated with the second cavity, the second piston rod is inserted into the second cavity, and the cross-sectional area of the second cavity is larger than that of the first cavity.

6. The injection molding mechanism of claim 1, wherein: the outer peripheral surface of the connecting flange is provided with a first oil inlet, a through hole is formed in the part of the end surface, located in the cylinder body, of the connecting flange, the first oil inlet is communicated with the through hole to form an oil inlet channel, and the oil inlet channel is communicated with the glue injection cavity.

7. An injection molding mechanism as claimed in claim 5, wherein: and a second oil inlet is formed at one end of the first piston rod, which is far away from the second piston rod, and the second oil inlet is communicated with the first cavity.

8. An injection molding mechanism as claimed in claim 6, wherein: the cylinder body is characterized in that a protruding layer is formed on the end face of one side, connected with the cylinder body, of the connecting flange, threads are formed on the periphery of the protruding layer, and the protruding layer is in threaded connection with the inner wall of the cylinder body.

9. An injection molding mechanism as claimed in claim 8, wherein: the through hole is formed in the end face of the protruding layer.