WO2024060770A1

WO2024060770A1 - Injection molding machine

Info

Publication number: WO2024060770A1
Application number: PCT/CN2023/104522
Authority: WO
Inventors: 陈明华
Original assignee: 苏州锦珂塑胶科技有限公司
Priority date: 2022-09-23
Filing date: 2023-06-30
Publication date: 2024-03-28
Also published as: CN115534248A

Abstract

The present invention relates to an injection molding machine, comprising a machine base, a plastic injection cylinder, a plastic injection screw rod, a pressure sensor and a power device, the power device comprising a power lead screw, a power thread sleeve, a power shaft, a feeding power mechanism, an injection power mechanism and an injection assisting mechanism. On one hand, the present invention can increase injection power by means of power provided by the injection assisting mechanism, so as to reduce the power specification of the injection power mechanism; and on the other hand, by means of cooperation of the feeding power mechanism, the injection power mechanism and the injection assisting mechanism, and combination with braking or release by means of a brake member, the present invention can accumulate energy during feeding and reduce the power specification of the feeding power mechanism. Therefore, the present invention can reduce the power specifications for injection and feeding while facilitating switching between linear and rotary modes.

Description

An injection molding machine

Technical Field

The invention belongs to the technical field of injection molding, and specifically relates to an injection molding machine.

Background technique

At present, the injection device of the injection molding machine mainly performs four actions:

Injection: The injection motor drives the rotating screw to push the injection screw forward;

Pressure holding: keep the pressure of the mold cavity and material tube constant for a period of time, while the injection motor continues to work;

Feeding: The feeding motor drives the injection screw to rotate (the injection screw can only rotate in one direction);

Back loosening: When the feeding motor drives the injection screw to rotate, the pressure in the front section of the injection screw will increase and create back pressure. At this time, the power screw needs to move backward to release the back pressure. At this time, the feeding motor and the injection motor work at the same time.

However, in most injection molding machines, the injection axis and the feeding axis are each controlled by a servo motor. The injection motor drives the power screw to rotate through the injection belt, pushing the injection screw forward and backward; when feeding, the feeding motor drives the injection screw. Rotation, in this way, injection and feeding each require a servo motor (generally, the injection servo motor is larger than the feeding servo motor). During the entire injection process, they will not produce maximum torque at the same time (that is to say, the output power of the injection motor At maximum, the feeding motor will not also do maximum output at the same time, and vice versa), so the utilization efficiency of the motor is relatively low. Therefore, not only does the selection of the servo motor increase the cost of the injection molding machine, but the utilization rate of the servo motor is low, resulting in injection molding high cost.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved injection molding machine.

In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

An injection molding machine including:

Machine base;

The barrel comprises a barrel with a material cavity formed inside and a nozzle arranged at the front end of the barrel, wherein the barrel is provided with a plastic raw material inlet;

The screw extends along the length of the barrel and extends into the machine base from the rear end;

Pressure Sensor;

The power device is used to drive the screw to rotate around its own axis or/and to move linearly along its own length, and includes a power screw, a power screw sleeve, a power shaft, a feeding power mechanism, an injection power mechanism, and an injection auxiliary mechanism. The power device The screw rod is concentric with the injection screw, and the spiral direction is the same as that of the injection screw. The direction is opposite; the power screw sleeve is threaded with the power screw; the power shaft coaxially connects the power screw sleeve and the injection screw and can rotate around its own axis or move along its own axis.

Preferably, the front end of the power shaft is connected to the rear end of the injection screw, the rear end of the power shaft is relatively rotatably connected to the front end of the power screw sleeve, and a connection is formed inside the power shaft that matches the front end of the power screw. hole. The power shaft connects the injection screw and the power screw sleeve, and also facilitates the assembly of the power screw.

In some embodiments, a threaded mating hole is formed inside the power thread sleeve, wherein the threaded mating hole and the connecting hole have equal diameters and are arranged in center alignment. In order to facilitate the relative extension of the front end of the power screw, the size of the equipment is shortened, while the outer diameter of the power screw remains equal.

According to a specific implementation and preferred aspect of the present invention, the power screw sleeve and the power shaft are connected through bearing transmission, a lubricating oil storage chamber is formed inside the machine base, and the bearing is immersed in the lubricating oil storage chamber. Here, on the one hand, the oil immersion mode ensures the lubrication of the bearing; on the other hand, it can improve the synchronization of the movement of the power screw sleeve and the power shaft. At the same time, the bearing is a needle roller bearing. A bearing cover is formed on the outer periphery of the needle roller bearing. An injection transmission seat is provided on the outer periphery of the power screw to avoid the movement of the power screw. Multiple auxiliary cylinders are located between the bearing cover and the injection transmission seat. .

According to another specific implementation and preferred aspect of the present invention, the feeding power mechanism includes a feeding power part that drives the power shaft to rotate around its own axis and a braking part, wherein the braking part can brake the power part to limit the rotation of the power shaft; the injection power mechanism It is used to drive the power screw to rotate around its own axis. The feeding power parts include a feeding pulley with the axis aligned and set on the periphery of the power shaft, a feeding motor with an output shaft parallel to the injection screw, and a feeding motor that connects the output shaft with the The feeding transmission part is connected to the feeding pulley; the braking part is arranged on the output shaft and can brake the rotation of the feeding pulley; the power shaft and the feeding pulley can rotate synchronously, and the power shaft can also rotate along its own length. It moves relative to the feeding pulley; a keyway extending along the length direction of the injection screw is formed on the feeding pulley, and a transmission key matching the keyway is fixedly formed on the power shaft. With the cooperation of the key and the groove, it is convenient to brake and release the brake parts, and at the same time, the accuracy of synchronization of the power shaft and the drive shaft is improved. In some specific embodiments, the braking component is a tooth brake.

Further, the keyway and the transmission key form a keyway group, and the feeding power part also includes a plurality of keyway groups, which are evenly spaced around the circumference of the power shaft. The arrangement of multiple keyway groups ensures the accuracy of synchronization between the power shaft and the drive shaft, and can form a limit during linear motion, further reducing the possibility of rotation during the linear motion of the injection screw.

According to another specific implementation and preferred aspect of the present invention, the injection auxiliary mechanism includes a plurality of auxiliary cylinders, an accumulator, and evenly spaced around the power screw circumferentially and arranged parallel to the power screw. and a control valve, wherein a plurality of the auxiliary cylinders expand and contract synchronously and can move synchronously with the power screw sleeve.

Preferably, during injection, the injection power mechanism and the auxiliary cylinder work synchronously, the brake brakes the power shaft, the power screw rotates, and the power screw sleeve, power shaft, and injection screw all advance without rotating to inject the plastic raw material; ensure When pressing, the injection power mechanism and the auxiliary cylinder work together to maintain the set pressure; when feeding, the injection power mechanism drives the power screw to rotate in reverse, and at the same time, the feeding power part drives the power shaft to rotate and cooperate, so that the power screw and the power screw sleeve Rotate in place to add ingredients. In short, during injection, the acceleration is faster, which improves the overall injection performance; during pressure maintenance, it can continuously provide a force, reduce the output of the injection motor, and improve the control effect of pressure maintenance; the hydraulic pressure in the hydraulic oil circuit After the valve is closed, the position of the injection motor can be kept unchanged, so that the injection motor does not need to remain in the same position while waiting for injection.

Furthermore, when feeding, the speed of the power screw is N1, and the speed of the power shaft is N2, wherein when N1=N2, the power screw and the power screw sleeve rotate in situ to feed; when N1>N2, the power screw sleeve retreats, and the auxiliary oil cylinder compresses and stores energy. Here, by controlling the speeds N1 and N2, it is possible to implement the power screw and the power screw sleeve rotating in situ to feed or the auxiliary oil cylinder compresses to store energy and feed. In some specific embodiments, when the rear is loose or the flow is prevented, the brake part is in braking, and the injection power mechanism drives the power screw to rotate to overcome the force of the auxiliary oil cylinder to make the screw nut retreat. At the same time, before the next injection action starts, the control valve disconnects the accumulator and the auxiliary oil cylinder, wherein the control valve is an electromagnetic two-way shut-off valve. Under the oil circuit control of the electromagnetic two-way shut-off valve, the auxiliary force provided by the auxiliary oil cylinder can be implemented.

In addition, a ball screw assembly is formed by a power screw, a power shaft, and a power screw sleeve, and the ball screw assembly can be located in the machine base with oil-immersed lubrication; the rear end of the power screw is arranged to pass through the rear end of the machine base, and the injection power mechanism includes an injection pulley fixed to the rear end of the power screw, an injection motor located at the bottom of the machine base, and an injection transmission component for connecting the injection motor to the injection pulley.

From the above content, it can be seen that the injection molding working status of the injection molding machine is as follows:

Injection: The injection motor and accumulator supply oil to the injection auxiliary cylinder. At this time, the tooth brake brakes. With the cooperation of the keyway matching part, the injection motor drives the power screw to rotate clockwise to realize the power screw sleeve and power shaft. The advancement (that is, the advancement of the injection screw).

Pressure maintenance: The injection motor and auxiliary cylinder work together to maintain a certain pressure.

Adding materials:

State 1: The injection motor drives the power screw to rotate counterclockwise at a speed of N1, and the feeding motor drives the power shaft to rotate at a speed of N2, N1=N2, and the screw and power screw sleeve rotate in situ to feed;

State 2: When the feeding reaches a certain stage in State 1, back pressure is generated. At this time, the power screw speed is increased N1>N2, the power screw sleeve retreats, and the injection auxiliary cylinder compresses and stores energy;

Repeating state 1 and state 2 achieves energy storage for charging and injection auxiliary cylinder compression.

Back loosening (anti-casting): The tooth brake brakes, the injection motor rotates counterclockwise, and overcomes the force of the injection auxiliary cylinder to make the power screw sleeve retreat;

Before the next injection action starts, the accumulator and injection auxiliary cylinder are disconnected.

Here, it should be noted that the use of hydraulic accumulators: during injection, the acceleration is faster, improving the overall injection performance; during pressure maintenance, it can continuously provide a force, reduce the output of the injection motor, and improve the maintenance The control effect of pressure; after the hydraulic valve in the hydraulic oil circuit is closed, the position of the injection motor can be kept unchanged, so that when waiting for injection, the injection motor does not need to keep the position unchanged (or the motor does not need to brake ).

As for the factors that downsize the injection motor: an accumulator provides some of the power. Factors that reduce the specifications of the feeding motor: The power source of feeding is provided by both the injection motor and the feeding motor. At the same time, when the injection motor and the feeding motor work together, two usage conditions must be met: 1. The thread directions of the injection screw and the power screw need to be opposite; 2. The use of tooth brakes.

Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

On the one hand, the invention uses the power provided by the injection auxiliary mechanism to increase the injection power and reduce the power specifications of the injection power mechanism; on the other hand, through the cooperation of the feeding power mechanism, the injection power mechanism, and the injection auxiliary mechanism, combined with the braking Braking or releasing the parts not only enables energy storage during feeding, but also reduces the power specifications of the feeding power mechanism. Therefore, the present invention not only reduces the power specifications of injection and feeding; it also facilitates switching between linear and rotational.

Description of drawings

Fig. 1 is a schematic structural diagram of an injection molding machine of the present invention;

Figure 2 is a schematic front view of Figure 1;

Figure 3 is a schematic diagram of the right side of Figure 2;

FIG4 is a schematic top view of FIG1 ;

Figure 5 is an enlarged schematic diagram of the A-A cross-section in Figure 4 (the glue nozzle is omitted);

Figure 6 is a schematic diagram with partial structure omitted in Figure 1;

Figure 7 is a schematic front view of Figure 6;

Figure 8 is an exploded schematic diagram of the structure of Figure 1;

Figure 9 is an exploded schematic diagram of the partial structure in Figure 8;

Figure 10 is a schematic diagram of the working principle of the injection auxiliary mechanism in Figure 1;

Among them: 1. base; 10. rear seat body; 11. front seat body;

2. Injection barrel; 20. Injection barrel; 21. Injection nozzle; 20a. Plastic raw material entrance;

3. Injection screw;

4. Pressure sensor;

D. Power device; 5. Power screw; 6. Power screw sleeve; 7. Power shaft; g. Needle roller bearing; b. Bearing cover; 8. Feeding power mechanism; 80. Feeding power part; 800. Feeding belt wheel; 801, feeding motor; 802, feeding transmission parts; 802a, transmission gear; c1, keyway; c2, transmission key: C, keyway group; 81, brake parts; 9. Injection power mechanism; 90, injection pulley; 91. Injection motor; 92. Injection transmission parts; 920. Injection synchronous pulley; 921. Timing belt; h, anti-slip groove; S. Injection auxiliary mechanism; s1, injection transmission seat; s2, auxiliary cylinder; s3, energy storage device.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and easy to understand, the specific implementation modes of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

In the description of this application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the application.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this application, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements relationship, unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In this application, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

It should be noted that when an element is referred to as being "mounted" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

As shown in Figures 1 to 7, the injection molding machine of this embodiment includes a machine base 1, a glue injection barrel 2, a glue injection screw 3, a pressure sensor 4 and a power device D.

In some specific embodiments, the machine base 1 includes a rear seat body 10 forming a seat cavity, and a front seat body 11 detachably mounted on the front end of the rear seat body 10. The injection cylinder 2 is fixed on the front seat body 11 from the rear end, and the injection cylinder 2 includes an injection cylinder body 20 forming a material cavity inside, and an injection nozzle 21 arranged at the front end of the injection cylinder body 20, wherein the injection cylinder body 20 is provided with a plastic raw material inlet 20a. The injection screw 3 extends along the length direction of the injection cylinder 2 and extends into the front seat body 11 from the rear end. The pressure sensor 4 is arranged in the rear seat body 10. The power device D is used to drive the injection screw 3 to rotate around its own axis or/and move linearly along its own length direction.

As shown in Figures 8 and 9, the power device D includes a power screw 5, a power screw sleeve 6, a power shaft 7, a feeding power mechanism 8, an injection power mechanism 9, and an injection auxiliary mechanism S.

In some specific embodiments, the power screw 5 is concentric with the injection screw 3 and has a spiral direction opposite to that of the injection screw 3 . In this way, a better cooperative movement can be formed between the feeding power mechanism 8 and the injection power mechanism 9 to reduce the choice of power specifications. A threaded fitting hole is formed inside the power screw sleeve 6 , and the threaded fitting hole matches the external thread of the power screw 5 . The power shaft 7 coaxially connects the power screw sleeve 6 and the injection screw 3 and can rotate around its own axis or move along its own axis. The front end of the power shaft 7 is connected to the rear end of the injection screw 3. The power shaft 7 The rear end of 7 is relatively rotatably connected to the front end of the power screw sleeve 6 . In some embodiments, the interior of the power shaft 7 forms There is a connecting hole matching the front end of the power screw 5, wherein the diameter of the threaded matching hole and the connecting hole are equal and the centers are aligned. In this way, the relative extension of the front end of the power screw is facilitated and the size of the equipment is shortened, while the outer diameter of the power screw remains equal. At the same time, the power screw sleeve 6 and the power shaft 7 are transmission connected through the needle bearing g. In this way, through the thrust of the needle bearing, the synchronization of the movement of the power screw sleeve 6 and the power shaft 7 is improved. In some specific embodiments, the lubrication of the needle roller bearing g adopts an oil immersion mode, and a bearing cover b is formed on the outer periphery of the needle roller bearing g.

As shown in Figure 10, the injection auxiliary mechanism S includes an injection transmission seat s1 that is sleeved on the outer periphery of the power screw 5, and is parallel to the power screw 5 and has both ends connected between the bearing cover b and the injection transmission seat s1. Auxiliary oil cylinder s2, an accumulator s3 used to control the expansion and contraction of the auxiliary oil cylinder s2, and a control valve s4 provided between the accumulator s3 and the auxiliary oil cylinder s2. There are two auxiliary oil cylinders s2, and they surround the power screw. 5 evenly distributed in the circumferential direction.

In some specific implementations, two auxiliary oil cylinders s2 are symmetrically arranged on both sides of the power screw 5 and are arranged to telescope synchronously. At the same time, the two auxiliary oil cylinders s2 can also be arranged in the seat cavity to move synchronously with the power screw sleeve 6 . The control valve s4 is an electromagnetic two-way stop valve, and under the control of the oil circuit of the electromagnetic two-way stop valve, it can implement the auxiliary force provided by the auxiliary cylinder. In some specific implementations, before the next injection action starts, the control valve s4 disconnects the accumulator s3 and the auxiliary cylinder s2.

The feeding power mechanism 8 includes a feeding power part 80 and a braking part 81 that drive the power shaft 7 to rotate around its own axis. The feeding power part 80 includes an axis-aligned feeding pulley 800 sleeved on the outer circumference of the power shaft 7, an output shaft and The injection screw 3 has a parallel feeding motor 801 and a feeding transmission part 802 that connects the output shaft of the feeding motor 801 to the feeding pulley 800 . In some specific embodiments, a keyway c1 extending along the length direction of the injection screw 3 is formed on the feeding pulley 800 , and a transmission key c2 matching the keyway c1 is fixedly formed on the power shaft 7 , wherein the keyway c1 and the transmission key c2 form Keyway Group C (i.e. regular keyway fit). The feeding power part 80 also includes two keyway groups C, which are evenly spaced around the power shaft 7 in the circumferential direction. Here, through the arrangement of two keyway groups C, the accuracy of synchronization between the power shaft 7 and the drive shaft is ensured, and a limit can be formed during linear motion, further reducing the possibility of rotation of the injection screw during linear motion.

In some embodiments, the feeding pulley 800 is a gear, and the feeding transmission member 802 includes a transmission gear 802a disposed on the output shaft and meshed with the gear. The gear meshing method is used to avoid pulley slippage and ensure high-precision control of movement. The braking member 81 is a dog brake, and the dog brake is arranged on the output shaft. The rear end of the power screw 5 is passed through the rear end of the rear seat body 10 .

The injection power mechanism 9 includes an injection pulley 90 fixed on the rear end of the power screw 5, located on the rear seat. The injection motor 91 at the bottom of the body 10 and the injection transmission member 92 used to drively connect the injection motor 91 to the injection pulley 90. The injection transmission member 92 includes an injection synchronous pulley 920 provided on the output shaft of the injection motor 91. The injection pulley 90 and the injection synchronous pulley 920 are synchronously connected to the synchronous belt 921. In some embodiments, the injection synchronous pulley 920 and the injection pulley 90 are both provided with anti-slip grooves h on their outer peripheries.

In addition, the above-mentioned power screw 5, power screw sleeve 6, and power shaft 7 form a ball screw assembly. In this way, the rotation of the power screw can be accurately implemented, and the motion output of the power screw sleeve and the power shaft to the injection screw can be completed more stably. In some specific embodiments, the lubrication of the ball screw assembly and the lubrication of the bearing can be carried out in an oil immersion mode to extend the service life.

In summary, the injection molding working status of the injection molding machine applied for is as follows:

Adding materials:

State 1: The injection motor drives the power screw to rotate counterclockwise at a speed of N1. The feeding motor drives the power shaft to rotate at a speed of N2. N1=N2. The screw and power screw sleeve rotate in place to feed;

Back loosening (anti-casting): The tooth brake is applied, and the injection motor rotates counterclockwise, overcoming the force of the injection auxiliary cylinder to make the power screw sleeve retreat.

At the same time, before the next injection action starts, the accumulator and the injection auxiliary cylinder are disconnected.

Therefore, the injection molding machine of this embodiment has the following advantages:

1) On the one hand, this application uses the power provided by the injection auxiliary mechanism to increase the injection power and reduce the power specifications of the injection power mechanism; on the other hand, through the cooperation of the feeding power mechanism, the injection power mechanism, and the injection auxiliary mechanism, and in combination The braking or releasing of the brake can not only store energy during feeding, but also reduce the power specifications of the feeding power mechanism. Therefore, the present invention not only reduces the power specifications of injection and feeding; it also facilitates switching between linear and rotational;

2) Use needle roller bearings to connect the power shaft and the power screw sleeve in relative rotation, and use the axial thrust of the needle roller bearing to improve the synchronization of the movement of the power screw sleeve and the power shaft; at the same time, the spiral direction of the injection screw is consistent with the power wire The spiral of the rod is opposite, combined with the tooth-type brake and the keyway fitting part, it is convenient for the power shaft to Switching between axial movement and circumferential rotation to implement the injection and feeding actions of the injection screw;

3). The specifications of the feeding motor and the injection motor have been reduced, and the corresponding drive specifications have also been reduced. Therefore, the motor selection requirements are greatly reduced, and the manufacturing and use costs are reduced.

The above detailed description of the present invention is intended to enable those familiar with the art to understand the content of the present invention and implement it. This does not limit the scope of protection of the present invention. Any work made based on the spirit of the present invention, etc. Effective changes or modifications shall be included in the protection scope of the present invention.

Claims

An injection molding machine including:

Machine base;

The injection cylinder comprises an injection cylinder body with a material cavity formed therein, and an injection nozzle arranged at the front end of the injection cylinder body, wherein the injection cylinder body is provided with a plastic raw material inlet;

The injection screw extends along the length of the injection barrel and extends into the machine base from the rear end;

Pressure Sensor;

A power device is used to drive the injection screw to rotate around its own axis or/and to move linearly along its own length. It is characterized in that the power device includes a power screw, a power screw sleeve, a power shaft, and a feeding power mechanism. , injection power mechanism, injection auxiliary mechanism, wherein the power screw is concentric with the injection screw, and the spiral direction is opposite to the spiral direction of the injection screw; the power screw sleeve is threaded with the power screw ; The power shaft coaxially connects the power screw sleeve and the injection screw and can rotate around its own axis or move along its own axis, wherein the front end of the power shaft and the rear end of the injection screw The rear end of the power shaft is relatively rotatably connected to the front end of the power screw sleeve, and a connection hole matching the front end of the power screw is formed inside the power shaft; the feeding power The mechanism includes a feeding power part that drives the power shaft to rotate around its own axis and a braking part, wherein the braking part can brake the power part to limit the rotation of the power shaft; the injection power mechanism is used to drive the power shaft. The power screw rotates around its own axis; the injection auxiliary mechanism includes a plurality of auxiliary cylinders, accumulators, and control valves evenly spaced around the circumference of the power screw and arranged parallel to the power screw, A plurality of the auxiliary oil cylinders expand and contract synchronously and can move synchronously with the power screw sleeve. During injection, the injection power mechanism and the auxiliary oil cylinders work synchronously, the brake member brakes the power shaft, and the power screw rotates, so The power screw sleeve, power shaft, and injection screw all advance without rotating to inject plastic raw materials; when maintaining pressure, the injection power mechanism and auxiliary cylinder work together to maintain the set pressure; when adding materials, the injection power mechanism drives the power screw Rotate in the opposite direction, and at the same time, the feeding power part drives the power shaft to rotate and cooperate, so that the power screw and the power screw sleeve rotate in place to feed;

The power screw sleeve and the power shaft are connected through a bearing transmission, a lubricating oil storage cavity is formed inside the machine base, and the bearing is immersed in the lubricating oil storage cavity; and/or the bearing is Needle roller bearing, a bearing cover plate is formed on the outer circumference of the needle roller bearing, an injection transmission seat is provided on the outer circumference of the power screw rod to avoid the movement of the power screw rod, and a plurality of auxiliary oil cylinders are located on the bearing cover plate and the injection transmission seat; a threaded mating hole is formed inside the power screw sleeve, wherein the threaded mating hole and the connecting hole have the same aperture and are arranged in center alignment; the feeding power part includes an axis-aligned sleeve Provided A feeding pulley on the outer periphery of the power shaft, a feeding motor with an output shaft parallel to the injection screw, a feeding transmission part that connects the output shaft of the feeding motor to the feeding pulley, and the brake part It is arranged on the output shaft and can brake the rotation of the feeding pulley. The power shaft and the feeding pulley can rotate synchronously, and the power shaft can also move relative to the feeding belt along its length direction. The feeding pulley moves, a keyway extending along the length direction of the injection screw is formed on the feeding pulley, and a transmission key matching the keyway is fixedly formed on the power shaft; and/or, the keyway and the transmission key A keyway group is formed, and the feeding power component includes a plurality of keyway groups, evenly spaced around the circumferential direction of the power shaft, and the power screw, the power shaft, and the power screw sleeve form a A ball screw assembly, and the ball screw assembly can be oil-immersed and lubricated and is located in the machine base; and/or, the rear end of the power screw is disposed through the rear end of the machine base, so The injection power mechanism includes an injection pulley fixed on the rear end of the power screw, an injection motor located at the bottom of the machine base, and an injection transmission member for drivingly connecting the injection motor and the injection pulley; When feeding, the rotation speed of the power screw is N1, and the rotation speed of the power shaft is N2. When N1=N2, the power screw and the power screw sleeve rotate in place to feed; when N1>N2, the power screw The screw sleeve retreats, and the auxiliary cylinder compresses and stores energy; before the next injection action starts, the control valve disconnects the accumulator and the auxiliary cylinder, and the control valve is an electromagnetic two-way stop valve; loosen or When preventing flow delay, the braking member is in braking, and the injection power mechanism drives the power screw to rotate to overcome the force of the auxiliary cylinder and make the screw nut retreat.
An injection molding machine including:

Machine base;

A barrel, which includes a barrel with a material cavity formed inside, and a nozzle provided at the front end of the barrel, wherein the barrel is provided with a plastic raw material inlet;

A screw extends along the length of the barrel and extends into the machine base from the rear end;

Pressure Sensor;

A power device is used to drive the screw to rotate around its own axis or/and to move linearly along its length. It is characterized in that: the power device includes a power screw, a power screw sleeve, a power shaft, a feeding power mechanism, and an injection device. Power mechanism and injection auxiliary mechanism, wherein the power screw is concentric with the injection screw, and the spiral direction is opposite to the spiral direction of the injection screw; the power screw sleeve is threaded with the power screw; The power shaft coaxially connects the power screw sleeve and the injection screw and can rotate around its own axis or move along its own axis.
The injection molding machine according to claim 2, characterized in that: the front end of the power shaft and the The rear end of the injection screw is connected, the rear end of the power shaft is relatively rotatably connected with the front end of the power screw sleeve, and the inside of the power shaft is formed with a front end of the power screw that matches the front end of the power screw. Connection holes.
The injection molding machine according to claim 3, wherein a threaded fitting hole is formed inside the power screw sleeve, wherein the threaded fitting hole and the connecting hole have equal apertures and are arranged in center alignment.
The injection molding machine according to claim 2, characterized in that: the power screw sleeve and the power shaft are connected through bearing transmission, a lubricating oil storage cavity is formed inside the base, and the bearing is immersed in the The lubricating oil storage chamber.
The injection molding machine according to claim 5, characterized in that: the bearing is a needle roller bearing.
The injection molding machine according to claim 6, characterized in that: a bearing cover is formed on the outer periphery of the needle roller bearing, and an injection transmission seat that can avoid the movement of the power screw is provided on the outer periphery of the power screw, and a plurality of The auxiliary oil cylinder is located between the bearing cover plate and the injection transmission seat.
The injection molding machine according to claim 2, characterized in that: the feeding power mechanism includes a feeding power part that drives the power shaft to rotate around its own axis and a braking part, wherein the braking part can brake the power to limit the rotation of the power shaft; the injection power mechanism is used to drive the power screw to rotate around its own axis.
The injection molding machine according to claim 8, characterized in that: the feeding power part includes a feeding pulley with an aligned axis and sleeved on the outer circumference of the power shaft, a feeding motor with an output shaft parallel to the injection screw, A feeding transmission member that drives and connects the output shaft of the feeding motor and the feeding pulley.
The injection molding machine according to claim 9 is characterized in that the braking member is arranged on the output shaft and can brake the rotation of the feeding pulley.
The injection molding machine according to claim 10, wherein the power shaft and the feeding pulley can rotate synchronously, and the power shaft can also move relative to the feeding pulley along its length direction.
The injection molding machine according to claim 11, characterized in that: a keyway extending along the length direction of the injection screw is formed on the feeding pulley, and a transmission key matching the keyway is fixedly formed on the power shaft. .
The injection molding machine according to claim 12 is characterized in that: the keyway and the transmission key form a keyway group, and the feeding power member also includes a plurality of the keyway groups, which are evenly spaced around the circumference of the power shaft.
The injection molding machine according to claim 2, characterized in that: the injection auxiliary mechanism includes A plurality of auxiliary oil cylinders, accumulators, and control valves evenly spaced around the circumference of the power screw and arranged parallel to the power screw, wherein the plurality of auxiliary oil cylinders can expand and contract synchronously and can be synchronized with the power screw. The screw sleeves move synchronously.
The injection molding machine according to claim 14, characterized in that: during injection, the injection power mechanism and the auxiliary oil cylinder work synchronously, the brake member brakes the power shaft, the power screw rotates, the power screw sleeve, the power screw The shaft and the injection screw move forward without rotating to inject the plastic raw material; when the pressure is maintained, the injection power mechanism and the auxiliary cylinder work together to maintain the set pressure; when feeding, the injection power mechanism drives the power screw to rotate in the reverse direction and feeds the material at the same time The power part drives the power shaft to rotate and cooperate, so that the power screw and the power screw sleeve rotate in place to feed materials.
The injection molding machine according to claim 15, characterized in that: when feeding materials, the rotation speed of the power screw is N1, the rotation speed of the power shaft is N2, and when N1=N2, the rotation speed of the power screw and The power screw sleeve rotates in place to feed; when N1>N2, the power screw sleeve retreats, auxiliary cylinder compression and energy storage.
The injection molding machine according to claim 14, characterized in that: before the next injection action starts, the control valve disconnects the accumulator and the auxiliary cylinder, wherein the control valve is an electromagnetic two-way stop valve. .
The injection molding machine according to claim 14, characterized in that: when the back is loosened or the flow delay is prevented, the brake member is in braking, and the injection power mechanism drives the power screw to rotate to overcome the force of the auxiliary cylinder to make the The screw nut moves backward.
The injection molding machine according to claim 2, characterized in that: the power screw, the power shaft, and the power screw sleeve form a ball screw assembly,
The injection molding machine according to claim 19 is characterized in that the ball screw assembly can be located in the machine base with oil-immersed lubrication.
The injection molding machine according to claim 2, characterized in that: the rear end of the power screw protrudes from the rear end of the machine base, and the injection power mechanism includes a component fixed on the rear end of the power screw. The injection pulley, the injection motor located at the bottom of the machine base, and the injection transmission member for drivingly connecting the injection motor and the injection pulley.