TW201728425A - Injection machine and its injection mechanism - Google Patents

Abstract

Provided is an injection mechanism for injection machine use, the mechanism including an injection base, a ball screw set, a tube pressure sensor that rotates relative to a ball screw of the ball screw set and comprises a tube hole, wherein one end of the tube pressure sensor is fixedly connected to the injection base while the other end thereof being connected to a nut of the ball screw set, thereby allowing the tube hole of the tube pressure sensor to accommodate the ball screw of the ball screw set without needing to increase the thickness of the injection base while decreasing its axial thickness, the dimensions and the weight so as to decrease the weight of the injection machine; further, the tube pressure sensor is installed between the injection base and the ball screw set to avoid the transfer of heat between the screw and the feed cylinder in high temperatures to ensure stability and also avoid interfering with the rotation torque during material storage, thereby achieving high precision, high stability and high repetitive pressure measuring and control. This invention further provides an injection machine.

Description

Injection molding machine and its injection mechanism

The present invention relates to the field of injection molding technology, and more particularly to an injection molding machine injection mechanism, and to an injection molding machine having the above injection molding machine injection mechanism.

Injection molding machine, also known as injection molding machine or injection machine. It is the main molding equipment for making thermoplastic or thermosetting plastics into plastic products of various shapes by using plastic molding dies. In the plastic injection molding process, the control of the injection pressure is the key to improve the quality of the product, such as the back pressure of the storage material, which is actually one of the important parameters for controlling the quality of the melt and the quality of the product in the injection molding process parameters. The presence of back pressure helps to compact the material in the groove, remove gas from the material, and accelerate heat transfer between the particles.

As shown in FIG. 1 , the figure is a schematic structural view of an injection molding machine injection mechanism of the prior art, and the injection molding machine injection mechanism includes a hopper 05 , a barrel 06 , a screw 07 , an injection seat and a ball screw set ( Ball screw pair), wherein the screw 07 is rotatably engaged with the injection seat; the ball screw set includes a ball screw 04 and a nut 03, and the rotation of the ball screw 04 can drive the nut 03 forward, thereby driving the injection seat to drive the screw 07 move forward, The melt is injected into the molding die.

At present, the injection pressure of the injection molding machine (ie, the injection pressure and the back pressure of the stock) is mainly measured by the disc type pressure sensor 02, and the disc type pressure sensor 02 is installed between the screw 07 and the injection seat or the injection seat and the ball. Between the screw sets. When the disc type pressure sensor 02 is installed between the injection seat and the ball screw set, the injection seat (specifically, the structure in the broken line frame in FIG. 1) includes the bearing 01 and is disposed at the end of the bearing 01 near the end of the ball screw set. The connecting body 08 has a hollow space for use as a receiving space for the screw 07 to accommodate a portion of the ball screw 04 after the retracting action to match the length of the injection stroke, thereby completing the entire ejection process. The bearing 01 and the connecting body 08 are generally formed by directly casting the injection seat integrally; or welding by welding to form the injection seat as a whole.

As a result, the overall axial thickness of the injection seat is large, which increases the size and weight of the injection seat, resulting in a relatively bulky, less flexible injection molding machine, a large space occupation, and a high cost.

Furthermore, when the disc type pressure sensor 02 is installed between the screw 07 and the injection seat, since the temperature of the screw 07 is transmitted to the disc type pressure sensor 02 during the injection of the injection molding machine, the disc is caused. The temperature rise of the pressure sensor 02 causes an increase in measurement error; in addition, during the storage process, due to the rotation of the intermediate screw 07, the outer casing of the disc pressure sensor 02 is disturbed by the rotational torque and the back pressure of the storage material. , causing errors in the measured values, affecting the accuracy of pressure measurement and control accuracy.

In addition, the above-mentioned disc type pressure sensor 02 has a large cross section, which also causes the overall load of the injection molding machine to be large, cumbersome, and occupying a large space.

In summary, how to reduce the occupation space of the injection molding machine and reduce the weight of the injection molding machine while avoiding the measurement error caused by the temperature rise of the pressure measuring element is an urgent need for those skilled in the art.

In view of the above, an object of the present invention is to provide an injection molding machine injection mechanism that can reduce the space occupied and reduce the weight while avoiding measurement errors caused by temperature rise of the load cell.

Another object of the present invention is to provide an injection molding machine that can reduce the space occupied and reduce the weight while avoiding measurement errors caused by temperature rise of the load cell.

In order to achieve the above object, the present invention provides an injection molding machine injection mechanism comprising: an injection seat; a ball screw pair; and a tubular pressure of a tube hole and a ball screw of the ball screw group. The sensor has one end fixedly connected to the injection seat and the other end fixedly connected to the nut of the ball screw set.

Preferably, in the injection molding machine of the above injection molding machine, the tube length of the tubular pressure sensor is equal to the length of the injection stroke of the injection mechanism of the injection molding machine.

Preferably, in the above injection molding machine injection mechanism, the injection seat includes a bearing rotatably coupled to a screw of the injection molding machine injection mechanism, and the tubular pressure sensor is fixedly coupled to the bearing.

Preferably, in the injection molding machine of the above injection molding machine, the tubular pressure sensor is fixedly coupled to the injection seat through a first flange (Flange), and the second bolt is coupled to the second bolt through the second flange. The nut is fixedly connected.

Preferably, in the injection molding mechanism of the above injection molding machine, outside the first flange The diameter, the outer diameter of the second flange is the same as the outer diameter of the nut near the end of the tubular pressure sensor.

Preferably, in the injection molding machine of the above injection molding machine, an annular notch is disposed on an outer wall of the middle portion of the tubular pressure sensor.

Preferably, in the injection molding machine of the above injection molding machine, the tubular pressure sensor is round tubular, and the tubular pressure sensor has a tube length larger than an outer diameter of the tubular pressure sensor.

It can be seen from the above technical features that the injection molding machine of the present invention comprises an injection seat, a ball screw set and a tubular pressure sensor, and the tube hole of the tubular pressure sensor is rotated and matched with the ball screw of the ball screw set, and the tubular shape One end of the pressure sensor is fixedly connected to the injection seat, and the other end is fixedly connected with the nut of the ball screw set.

The invention uses a tubular pressure sensor to measure the injection pressure of the injection molding machine. The working principle is as follows: when measuring the injection pressure during the injection process of the injection molding machine, the ball screw of the ball screw group is driven by the external force, and the nut of the ball screw set is fixed. At one end of the tubular pressure sensor, the screw that is ejected in the front cylinder is pushed forward, and the molten plastic is injected through the nozzle to the cavity of the mold to obtain an injection molding injection action. At this time, a tubular pressure sensor is used. The magnitude of the injection thrust is measured, and the injection pressure is kept constant by the closed-loop control of the controller; after the injection is completed, the storage phase is entered, and the screw in the cylinder is rotated under the external power of the other motor, and the inside of the cylinder is rotated. The material is conveyed and compacted along the screw groove under the action of the screw, and the material is pushed to the screw head by the double action of external heating and screw shearing. When the screw retreats under the action of the pressure rise of the molten material filling space, and transmits the back force to the rotation transmitting component, the thrust bearing transmits the force to the tubular pressure sensor, so that the tubular pressure sensor The distortion is deformed, and the recoil force of the stock is measured instantaneously. The controller is used to control the reverse speed of the ball screw, pull back the nut, and reduce the back force, thereby controlling the stable back pressure of the screw during storage.

The invention realizes the accurate measurement and control of the pressure during the injection pressure and the back pressure of the injection molding machine by combining the tubular pressure sensor with the current closed-loop pressure control; the structure is simple, and the dynamic response speed is ensured, thereby The system error is reduced, and the function of instant pressure control and precise pressure control is provided, which greatly improves the product quality.

Since the present invention utilizes the tube hole of the tubular pressure sensor to accommodate the ball screw of the ball screw set, the length of the ball screw protruding nut can enter the tube hole of the tubular pressure sensor without occupying extra space, so the injection seat need not be needed. The thickness of the integral injection seat is reduced by the provision of the connecting body to provide the accommodation space of the ball screw, thereby reducing the size and weight of the injection seat, thereby reducing the space occupied by the injection molding machine and reducing the injection molding machine. The weight also increases flexibility and reduces costs.

Moreover, the tubular pressure sensor is installed between the injection seat and the ball screw set, on the one hand, the temperature transmission of the screw and the barrel at a high temperature is avoided, and the temperature of the tubular pressure sensor is stabilized; The torque of the rotation is in front of the injection seat, so that the interference of the rotational torque force during the storage is removed, so that the value measured by the tubular pressure sensor is the pressure of the back pressure of the storage, thereby realizing the tubular pressure sensor. High precision, high stability, high repetition Pressure measurement and control.

In addition, the tubular pressure sensor has a small cross section and a small outer diameter, which also reduces the overall load of the injection molding machine, reduces the weight, reduces the occupied space, and improves the space utilization.

The invention also provides an injection molding machine, which comprises any of the above injection molding machine injection mechanisms. Since the injection molding machine injection mechanism has the above-mentioned effects, the injection molding machine having the above injection molding machine injection mechanism has the same effect, and thus will not be described herein.

01,1‧‧‧ bearing

02‧‧‧Disc pressure sensor

03, 3‧‧‧ nuts

04, 4‧‧‧ Ball screw

05, 5‧‧‧ hopper

06, 6‧‧‧ barrel

07, 7‧‧‧ screw

08‧‧‧Connector

2‧‧‧Tubular pressure sensor

21‧‧‧First flange

22‧‧‧Second flange

23‧‧‧Circular trough

1 is a schematic structural view of an injection molding machine injection mechanism in a prior art; FIG. 2 is a schematic structural view of an injection molding machine injection mechanism provided by an embodiment of the present invention; and FIG. 3 is an injection molding machine injection mechanism provided by an embodiment of the present invention; Figure 4 is a front elevational view of a tubular pressure sensor provided by an embodiment of the present invention; and Figure 5 is a left side view of a tubular pressure sensor provided by an embodiment of the present invention.

In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings which are required for the embodiments will be described below. It is obvious that the drawings in the description are some embodiments of the present invention, and the technical field to which the present invention pertains. In the case of ordinary knowledge, no premise of creative labor Further drawings can also be obtained from these figures.

The embodiment of the invention provides an injection molding machine injection mechanism, which can reduce the occupied space and reduce the weight while avoiding the measurement error caused by the temperature rise of the pressure measuring element.

The technical features in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

Referring to Figures 2 to 5, the injection molding machine of the embodiment of the present invention comprises a hopper 5, a barrel 6, a screw 7, an injection seat, a ball screw set and a tubular pressure sensor 2, wherein the hopper 5 is used for The material is added into the barrel 6, the screw 7 is rotatably disposed in the barrel 6, the screw 7 is rotatably connected with the injection seat; the ball screw set includes the ball screw 4 and the nut 3; the tube hole and the ball screw of the tubular pressure sensor 2 The ball screw 4 of the group is rotatably engaged, and one end of the tubular pressure sensor 2 is fixedly connected with the injection seat, and the other end is fixedly connected with the nut 3 of the ball screw set.

The invention uses the tubular pressure sensor 2 to measure the injection pressure of the injection molding machine. The working principle is as follows: when measuring the injection pressure during the injection process of the injection molding machine, the ball screw 4 of the ball screw group is driven by an external force, and the ball screw group is rotated. The nut 3 is fixed to one end of the tubular pressure sensor 2, which pushes the front barrel 6 forward The screw 7 is injected inside, and the molten plastic is injected through the nozzle to the cavity of the mold to obtain an injection molding injection operation. At this time, the tubular pressure sensor 2 is used to measure the magnitude of the injection thrust, and the controller is closed-loop controlled to maintain the injection molding. The pressure is constant; after the injection is completed, the storage phase is entered, at which time the screw 7 in the barrel 6 is rotated by the external power of the other motor, and the material in the barrel 6 is driven by the screw 7 along the snail. The trough is conveyed forward and compacted, and the material is pushed to the head of the screw 7 by the double action of external heating and shearing by the screw 7, while the screw 7 fills the space of the molten material to generate a pressure rise. Retreating under the action, and transmitting the retreating force to the rotation transmitting member, the force is transmitted to the tubular pressure sensor 2 by the thrust bearing, so that the tubular pressure sensor 2 is twisted and deformed, thereby instantly measuring the backward force of the storage material. The controller controls the reverse rotation speed of the ball screw 4, pulls back the nut 3, reduces the backward force, and further controls the stable back pressure of the screw 7 during the storage.

The invention realizes the accurate measurement and control of the pressure during the injection pressure and the back pressure of the injection molding machine by combining the tubular pressure sensor 2 with the current closed-loop pressure control; the structure is simple, and the dynamic response speed is ensured. Thereby reducing the error of the system, the function of real-time pressure control and precise pressure control, greatly improving the quality of the product.

Since the present invention utilizes the tube hole of the tubular pressure sensor 2 to accommodate the ball screw 4 of the ball screw set, the ball screw 4 protrudes from the length of the nut 3 to enter the tube hole of the tubular pressure sensor 2 without taking up extra space. Therefore, the injection seat does not need to increase the thickness by providing the connecting body to provide the accommodation space of the ball screw 4, thereby reducing the axial thickness of the integral injection seat, reducing the size and weight of the injection seat, thereby reducing the space occupied by the injection molding machine. At the same time Lighter weight of the injection molding machine also increases flexibility and reduces costs.

Moreover, the tubular pressure sensor 2 is installed between the injection seat and the ball screw set, on the one hand, the temperature transfer of the screw 7 and the barrel 6 at a high temperature is avoided, and the temperature of the tubular pressure sensor 2 is stabilized; In view of the fact that the torque for rotating during storage is in front of the injection seat, the interference of the rotational torque force during the storage is removed, so that the value measured by the tubular pressure sensor 2 is the pressure of the back pressure of the storage material, thereby realizing Tubular Pressure Sensor 2 High precision, high stability, high repeat pressure measurement and control.

In addition, the tubular pressure sensor 2 has a small cross section and a small outer diameter, which also reduces the overall load of the injection molding machine, reduces the weight, reduces the occupied space, and improves the space utilization.

Preferably, the tube length of the tubular pressure sensor 2 is equal to the length of the injection stroke of the injection molding machine injection mechanism. The invention makes the pipe length of the tubular pressure sensor 2 the same as the injection stroke length of the injection mechanism of the injection molding machine, so that when the injection seat performs the retreating action, the nut 3 is connected with the injection under the rotation of the ball screw 4 in one direction. When the seat is retracted, a part of the ball screw 4 will protrude from the nut 3, and the ball screw 4 of the protruding portion will enter the tube hole of the tubular pressure sensor 2; when the injection seat moves forward under the shooting action, In the other direction of the rotation of the ball screw 4, the nut 3 is moved forward with the injection seat, and the ball screw 4 is just flush with the end of the tubular pressure sensor 2 near the nut 3, thereby satisfying the ball screw. Under the premise of group work, the tube length of the tubular pressure sensor 2 is minimized, the space utilization rate is improved, and the overall load and weight of the injection molding machine are further reduced. It can be understood that the tube length of the above tubular pressure sensor 2 can also be smaller or larger than the injection molding. The length of the injection stroke of the machine injection mechanism is not specifically limited in the present invention. In order to facilitate the assembly of the tubular pressure sensor 2, the tubular pressure sensor 2 is fixedly connected to the injection seat by the first flange 21 and the first bolt, and the second bolt 22 is fixedly connected with the nut 3 by the second bolt, such as Figures 4 to 5 are shown. The invention fixes both ends of the tubular pressure sensor 2 through the flange, and has good fixing strength and is convenient for disassembly and assembly. Moreover, effective fixing of the tubular pressure sensor 2 can be achieved with a small outer diameter of the tubular pressure sensor 2. The tubular pressure sensor 2 described above can also be fixed by welding or other fixing means.

In a preferred embodiment of the invention, the injection housing includes a bearing 1 rotatably coupled to a screw 7 of an injection molding machine injection mechanism, the tubular pressure sensor 2 being fixedly coupled to the bearing 1. The contrast between the dashed box in FIG. 1 and the dashed box in FIG. 2 is a comparison between the injection seat of the prior art and the injection seat of the present invention. The injection seat of the present invention consists only of the bearing 1 and utilizes tubular pressure. The sensor 2 replaces the connector 08 in the prior art injection seat, and the hollow portion of the tubular pressure sensor 2 and the overall length can match the length of the injection stroke, reducing the load and weight of the overall machine.

In a further technical feature, the outer diameter of the first flange 21 and the outer diameter of the second flange 22 are the same as the outer diameter of the nut 3 near the end of the tubular pressure sensor 2. The first flange 21 and the second flange 22 do not occupy the extra outer diameter of the nut 3, which reduces the occupied space. It can be understood that the first flange 21 and the second flange 22 may also protrude from the nut 3 near the end of the tubular pressure sensor 2.

In order to further reduce the weight of the injection molding machine, the note provided by the above embodiment In the press mechanism of the press machine, the outer wall of the middle portion of the tubular pressure sensor 2 is provided with an annular notch 23, which reduces the weight of the tubular pressure sensor 2. The annular chute 23 facilitates processing; of course, the present invention can also achieve the same mitigation by using a plurality of circular chutes or other shaped chutes.

In a specific embodiment, the tubular pressure sensor 2 is a circular tube. In this embodiment, the tubular pressure sensor 2 has a circular cross-sectional shape, and the inner hole is a circular hole that is rotatably engaged with the ball screw 4, and the outer wall is circular, and the tubular pressure sensor 2 of the shape is inside. The wall and the outer wall have the same shape and are easy to manufacture. At the same time, the tube length of the tubular pressure sensor 2 is larger than the outer diameter of the tubular pressure sensor 2, which can ensure that the tubular pressure sensor 2 is flat and long, reducing the space and reducing the weight. It can be understood that the tubular pressure sensor 2 can also be rectangular, in which the outer wall is rectangular, and the tubular pressure sensor 2 has a tube length larger than the long side of the tubular pressure sensor 2 (which can also be a wide side). The tubular pressure sensor 2 may also be square, elliptical or other irregular shape; the tube length of the tubular pressure sensor 2 may also be equal to or smaller than the outer diameter of the tubular pressure sensor 2, and the present invention does not Specifically limited.

The invention also provides an injection molding machine, comprising an injection mechanism, which is an injection molding machine injection mechanism provided by any of the above embodiments, which can reduce the occupation space while avoiding measurement errors caused by temperature rise of the pressure measuring element. The weight is reduced, and the advantages thereof are brought about by the injection mechanism of the injection molding machine. For details, please refer to the relevant parts in the above embodiments, and details are not described herein again.

The various embodiments in the specification are described in a gradual manner, and each embodiment is focused on differences from the other embodiments, and the same or similar parts between the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables those of ordinary skill in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. achieve. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the scope of the broadest claims.

1‧‧‧ bearing

2‧‧‧Tubular pressure sensor

3‧‧‧ nuts

4‧‧‧Ball screw

5‧‧‧ hopper

6‧‧‧Bowl

7‧‧‧ screw

Claims (8)

An injection molding machine injection mechanism includes: an injection seat; a ball screw set having a ball screw and a nut; and a tubular pressure sensor having a tube hole for rotating with the ball screw, and the tubular pressure sensor One end is fixedly connected to the injection seat, and the other end is fixedly connected to the nut. The injection molding machine injection mechanism of claim 1, wherein the tubular pressure sensor has a tube length equal to an injection stroke length of the injection molding mechanism of the injection molding machine. The injection molding machine injection mechanism of claim 1, further comprising a screw, and the injection seat includes a bearing rotatably coupled to a screw of the injection molding machine of the injection molding machine, wherein the tubular pressure sensor and the bearing Fixed connection. The injection molding machine injection mechanism of claim 1, wherein the tubular pressure sensor is fixedly coupled to the injection seat through a first flange (Flange) and the first flange, and is coupled to the second flange. The second bolt is fixedly connected to the nut. The injection molding machine injection mechanism of claim 4, wherein an outer diameter of the first flange and an outer diameter of the second flange are the same as an outer diameter of the nut adjacent to one end of the tubular pressure sensor. An injection molding machine injection mechanism according to any one of claims 1 to 5, wherein an annular restriction groove is provided on an outer wall of the middle portion of the tubular pressure sensor. The injection molding machine injection mechanism of claim 6, wherein the tubular pressure sensor has a circular tubular shape, and the tubular pressure sensor has a tube length greater than an outer diameter of the tubular pressure sensor. An injection molding machine comprising an injection molding machine injection mechanism as described in any one of claims 1 to 7.