Injection Molding Apparatus

Abstract

The present invention relates to an injection device comprising: a barrel for supplying a molding material; an injection screw located inside the barrel; an injection drive unit for driving the injection screw; a nozzle unit coupled to the barrel; and a measuring unit coupled to the front surface of the nozzle unit for measuring a pressure value for a molding device, wherein when the measuring unit directly contacts the molding device to measure a pressure value, the measuring unit determines the connection state between the nozzle unit and the molding device using the pressure value.

Description

Technology Field

[0001] The present invention relates to an injection molding machine that performs injection molding to manufacture an injection molded product. Background Technology

[0002] Injection molding is the most widely used manufacturing method for plastic products. For example, various parts, including covers and cases, for products such as televisions, mobile phones, and PDAs can be manufactured through injection molding.

[0003] Generally, the manufacturing of products through injection molding is carried out through the following processes. First, molding material containing pigments, stabilizers, plasticizers, and fillers is fed into a hopper and melted. Next, the molten molding material is injected into a mold and solidified through cooling. Then, the solidified molding material is extracted from the mold, and unnecessary parts are removed. Through these processes, injection-molded products of various types and sizes are manufactured. An injection molding machine is used as the equipment to perform this injection molding process.

[0004] FIG. 1 is a schematic block diagram of an injection molding machine according to the prior art.

[0005] Referring to FIG. 1, an injection molding machine (100) according to the prior art includes a molding device (110) and an injection device (120).

[0006] The molding device (110) solidifies the molten molding material supplied from the injection device (120) through cooling. The molding device (110) includes a mold (111) having a cavity of a shape corresponding to an injection product. When the injection device (120) supplies the molten molding material to the cavity of the mold (111), the molding device (110) solidifies the molten molding material located in the cavity through cooling. The molding material solidified in this way is manufactured into an injection product through a subsequent process.

[0007] The injection device (120) supplies molten molding material to the molding device (110). The injection device (120) includes a barrel (121) for supplying molding material to the molding device (110), an injection screw (122) disposed inside the barrel (121), and a nozzle (123) coupled to the barrel (121). When molding material is supplied into the interior of the barrel (121) through a hopper, the injection device (120) rotates the injection screw (122) to melt the molding material inside the barrel (121) and performs a metering operation. As the metering operation is performed in this manner, the molten molding material flows forward and accumulates in front of the injection screw (122). When the measured molding material is positioned in front of the injection screw (122), the injection device (120) moves the injection screw (122) forward to perform an injection operation in which the molten molding material is supplied to the molding device (110). The molten molding material can be supplied to the molding device (110) through a nozzle (123) coupled to the barrel (121). The nozzle (123) can supply the molten molding material to the molding device (110) by being connected to the molding device (110). During the process of connecting the nozzle (123) to the molding device (110) so as to be aligned, the operator performs the task of determining the state in which the nozzle (123) is connected to the molding device (110) by measuring the pressure value of the nozzle (123) relative to the molding device (110).

[0008] Here, the injection molding machine (100) according to the prior art does not directly measure the pressure value of the nozzle (123) to the molding device (110), but indirectly measures the pressure value of the nozzle (123) to the molding device (110) through the load applied when the injection screw (122) is driven. Accordingly, the injection molding machine (100) according to the prior art has a problem of reduced accuracy in determining the connection state between the nozzle (123) and the molding device (110) compared to the case where the pressure value of the nozzle (123) to the molding device (110) is directly measured. As a result, the injection molding machine (100) according to the prior art has a problem in which the quality of the injection product is degraded because the nozzle (123) is connected in a state where it is not aligned with the molding device (110), and the nozzle (123) cannot smoothly supply molding material to the molding device (110), and also has a problem in which the durability of the nozzle (123) and the molding device (110) is reduced. The problem to be solved

[0009] The present invention was devised to solve the problem described above and is intended to provide an injection device capable of determining the connection status between the nozzle part and the molding device by directly measuring the pressure between the nozzle and the molding device. means of solving the problem

[0010] To achieve the above objectives, the present invention may include the following configuration.

[0011] An injection device according to the present invention may include a barrel for supplying a molding material; an injection screw located inside the barrel; an injection drive unit for driving the injection screw; a nozzle unit coupled to the barrel; and a measuring unit coupled to the front surface of the nozzle unit for measuring a pressure value for a mold clamping device. The injection device according to the present invention may include a judgment unit that determines the connection state between the nozzle unit and the mold clamping device using the pressure value when the measuring unit directly contacts the mold clamping device to measure the pressure value. Effects of the invention

[0012] According to the present invention, the following effects can be achieved.

[0013] The present invention is implemented such that a measuring part coupled to the front surface of a nozzle part directly contacts a molding device to measure the pressure value between the nozzle part and the molding device. Accordingly, the present invention can increase the accuracy of the operation of determining the connection status between the nozzle part and the molding device through the pressure value between the nozzle part and the molding device. Brief explanation of the drawing

[0014] FIG. 1 is a schematic block diagram of an injection molding machine according to the prior art. FIG. 2 is a schematic perspective view showing an example of an injection molding machine to which an injection device according to the present invention is applied. FIG. 3 is a schematic block diagram of an injection device and an injection molding machine according to the present invention. FIG. 4 is a schematic perspective view of a nozzle portion in an injection device according to the present invention. FIG. 5 is a partial front view of a nozzle portion for explaining the front surface of the nozzle portion in an injection device according to the present invention. FIG. 6 is a schematic side view of an injection device according to the present invention. FIG. 7 is a schematic side view showing the state in which a nozzle part is connected to a mold clamping device in an injection device according to the present invention. Specific details for implementing the invention

[0015] Hereinafter, an embodiment of an injection device according to the present invention will be described in detail with reference to the attached drawings.

[0016] Referring to FIGS. 2 and 3, the injection device (1) according to the present invention is provided in an injection molding machine (10). The injection device (1) according to the present invention is responsible for supplying molten molding material to a mold clamping device (11) of the injection molding machine (10). The mold clamping device (11) is responsible for solidifying the molten molding material through cooling. The mold clamping device (11) includes a fixed plate (12) coupled with a fixed mold (not shown) and a movable plate (13) coupled with a movable mold (not shown). When the movable plate (13) moves and the movable mold and the fixed mold are closed, the injection device (1) according to the present invention supplies molten molding material into the interior of the movable mold and the fixed mold through the fixed plate (12). When the interiors of the movable mold and the fixed mold are filled with molten molding material, the molding device (11) solidifies the molten molding material through cooling and then moves the movable plate (13) to open the movable mold and the fixed mold.

[0017] In order to supply a molten molding material to the molding device (11) above, the injection device (1) according to the present invention includes a barrel (2) and a nozzle part (3).

[0018] Referring to FIGS. 2 and 3, the barrel (2) is intended to supply molding material to the molding device (11). The molding material may be supplied into the interior of the barrel (2) through a hopper (not shown) coupled to the barrel (2). The molding material supplied into the interior of the barrel (2) may be supplied to the molding device (11) through the barrel (2) after being melted through friction, heating, etc. The barrel (2) may be formed in a hollow cylindrical shape, but is not limited thereto, and may be formed in other shapes as long as they can supply molding material to the molding device (11).

[0019] The barrel (2) may be coupled to the injection body (20). The barrel (2) may be coupled to the injection body (20) so as to protrude from the injection body (20) toward the molding device (11). The barrel (2) may be arranged parallel to a first axial direction (X-axis direction). The first axial direction (X-axis direction) may be an axial direction parallel to the direction in which the injection body (20) and the molding device (11) are spaced apart from each other.

[0020] An injection screw (30) may be disposed inside the barrel (2). The injection screw (30) may be rotated by an injection drive unit (40). When molding material is supplied into the interior of the barrel (2), the injection drive unit (40) can move the molding material supplied into the interior of the barrel (2) forward (in the direction of the FD arrow) by rotating the injection screw (30). In this process, the molding material may be melted by friction. The forward direction (in the direction of the FD arrow) may be a direction from the injection body (20) toward the barrel (2) and may be a direction parallel to the first axis direction (X-axis direction). When the molten molding material is positioned in the forward direction (FD arrow direction) relative to the injection screw (30), the injection drive unit (40) can supply the molten molding material to the molding device (11) by moving the injection screw (30) forward (FD arrow direction). In this case, the molten molding material can be supplied to the molding device (11) through the nozzle unit (3) coupled to the barrel (2).

[0021] Referring to FIGS. 2 and 3, the nozzle part (3) is intended to supply the molten molding material to the molding device (11) by discharging the molten molding material located inside the barrel (2) to the outside of the barrel (2). The nozzle part (3) may be coupled to the barrel (2) so as to be located in the front (direction of the FD arrow) relative to the barrel (2). When the molten molding material is supplied to the molding device (11), the nozzle part (3) may be connected to the molding device (11). The nozzle part (3) may be connected to the molding device (11) positioned in front of the nozzle part (3) by moving forward (direction of the FD arrow), and may be disconnected from the molding device (11) by moving backward (direction of the BD arrow). The nozzle part (3) can supply molten molding material into the interior of the movable mold and the fixed mold by supplying molten molding material through an injection port (not shown) provided in the molding device (11) while connected to the molding device (11). When the interior of the movable mold and the fixed mold is filled with molten molding material, the molding device (11) can solidify the molten molding material by cooling and then move the movable plate (13) to open the movable mold and the fixed mold.

[0022] Hereinafter, a structure for verifying the connection state between the nozzle part (3) and the molding device (11) in the injection device (1) according to the present invention will be described in detail. Here, the connection state between the nozzle part (3) and the molding device (11) refers to a state in which the nozzle part (3) is connected to the molding device (11) so that the nozzle part (3) can supply molding material through an injection port provided in the molding device (11). For example, the connection state between the nozzle part (3) and the molding device (11) can be determined by whether the nozzle part (3) is located at a position that aligns with the molding device (11). For example, the connection state between the nozzle part (3) and the molding device (11) can also be determined by whether the molding device (11) is properly pressurized while the nozzle part (3) is connected to the molding device (11).

[0023] Referring to FIGS. 2 to 6, the injection device (1) according to the present invention may include a measuring unit (4) for measuring a pressure value for the molding device (11), and a judging unit (5) for judging the connection state between the nozzle unit (3) and the molding device (11) using the pressure value.

[0024] The measuring unit (4) is coupled to the front surface (32) of the nozzle unit (3) to measure the pressure value for the molding device (11). The pressure value is the magnitude of the pressure applied to the nozzle unit (3) and the molding device (11) respectively as the nozzle unit (3) pressurizes the molding device (11). When the nozzle unit (3) moves forward and connects with the molding device (11), the measuring unit (4) can directly contact the molding device (11) at the front surface (32) of the nozzle unit (3). Accordingly, the measuring unit (4) can measure the pressure value for the molding device (11) by directly contacting the molding device (11). The front surface (32) of the nozzle part (3) may be a surface that comes into contact with and is pressurized by the molding device (11) when the nozzle part (3) moves forward and is connected to the molding device (11). The measuring part (4) may be composed of a sensor capable of measuring the magnitude of pressure.

[0025] The above judgment unit (5) determines the connection state between the nozzle unit (3) and the molding device (11) using the pressure value measured by the above measurement unit (4).

[0026] Accordingly, the injection device (1) according to the present invention can achieve the following effects.

[0027] First, the injection device (1) according to the present invention is implemented so that the pressure value for the molding device (11) can be directly measured through the measuring unit (4). The injection molding machine (100) according to the prior art did not directly measure the pressure value for the molding device (110), but rather measured the pressure value indirectly through the load applied when the injection drive unit drives the injection screw (122). However, since the load applied to the injection drive unit is affected by complex factors such as the durability of the injection drive unit and the injection screw (122), the connection state between the injection drive unit and the injection screw (122), and the molten state of the molding material in contact with the injection screw (122) inside the barrel (2) of the injection screw (122), in addition to the connection state between the nozzle (123) and the molding device (110), the accuracy and reliability of the actual pressure value between the nozzle (123) and the molding device (110) according to the prior art are reduced. In contrast, the injection device (1) according to the present invention measures the pressure value by the measuring part (4) directly contacting the molding device (11), thereby further improving the accuracy and reliability of the actual pressure value between the nozzle part (3) and the molding device (11) compared to the injection molding machine (100) according to the prior art. Accordingly, the injection device (1) according to the present invention can improve the accuracy of the operation of determining the connection state between the nozzle (123) and the molding device (11) by improving the accuracy and reliability of the pressure value between the nozzle part (3) and the molding device (11).

[0028] Second, the injection device (1) according to the present invention is implemented such that the measuring part (4), coupled to the front surface (32) of the nozzle part (3), directly contacts the molding device (11). Accordingly, the injection device (1) according to the present invention can improve the accuracy of the operation of determining whether the nozzle part (3) is actually in contact with the molding device (11) through the measuring part (4). In the case of an injection molding machine (100) according to the prior art, the pressure value is obtained from the load applied to the injection drive part regardless of whether the nozzle (123) is actually in contact with the molding device (110). Therefore, if an abnormal load is applied to the injection drive part while the nozzle (123) is separated from the molding device (110), a problem may occur in which molten molding material is discharged from the nozzle (123). In contrast, the injection device (1) according to the present invention has a structure in which the measuring part (4) directly contacts the molding device (11) to measure the pressure value; therefore, in order to measure the pressure value, the process of the nozzle part (3) contacting the molding device (11) must precede. Accordingly, the injection device (1) according to the present invention is implemented in such a way that the molten molding material located inside the barrel (2) is fundamentally blocked from being supplied to the molding device (11) while the nozzle part (3) is not in contact with the molding device (11), thereby reducing manufacturing costs and improving the quality of the injection product.

[0029] Below, the nozzle part (3), the measuring part (4), and the judgment part (5) of the injection device (1) according to the present invention will be examined in detail.

[0030] Referring to FIGS. 2 to 6, the nozzle part (3) may include a nozzle body (31), a front surface (32), and an outlet (33).

[0031] The nozzle body (31) forms the overall shape of the nozzle part (3). The nozzle body (31) can be coupled to the barrel (121). The nozzle body (31) can be positioned at the front of the barrel (direction of the FD arrow). The barrel (2) can be positioned at the rear (direction of the BD arrow) of the nozzle body (31), and the molding device (11) can be positioned at the front (direction of the FD arrow) of the nozzle body (31). The molten molding material supplied from the barrel (2) into the interior of the nozzle body (31) can move forward (direction of the FD arrow) and be discharged to the outside of the nozzle body (31) through the discharge port (33). The molten molding material discharged to the outside of the nozzle body (31) through the discharge port (33) can be supplied to the molding device (11) through an injection port (not shown) formed in the molding device (11). The molding device (11) can solidify the molten molding material through cooling and then open the movable mold and the fixed mold. The nozzle body (31) may be formed in a hollow cylindrical shape, but is not limited thereto, and may be formed in other shapes as long as it can supply molding material to the molding device (11).

[0032] A front surface (32) may be disposed at the front of the nozzle body (31). The front surface (32) may be formed convexly toward the front and may be a surface formed in the shape of a circle overall. As the nozzle part (3) moves forward, the front surface (32) may come into contact with the molding device (11) as shown in FIG. 6. Accordingly, the measuring part (4) coupled to the front surface (32) can come into direct contact with the molding device (11) to measure the pressure value.

[0033] The above discharge port (33) discharges the molten molding material inside the nozzle part (3) to the outside of the nozzle part (3). The discharge port (33) may be positioned on the front surface (32). When the nozzle part (3) moves forward and the front surface (32) comes into contact with the molding device (11), the molten molding material may be discharged from the nozzle part (3) through the discharge port (33) and supplied into the interior of the molding device (11). The discharge port (33) may be formed by penetrating the interior of the nozzle body (31) from the front surface (32). The discharge port (33) may be formed in a generally circular hollow shape, but is not necessarily limited thereto, and may be formed in other shapes as long as it allows the molding material to be discharged from the nozzle part (3) to the outside. Although not illustrated, an inlet may be positioned on the rear surface located at the rear of the nozzle body (31). The above inlet is intended for molten molding material to be introduced from the barrel (2). When molding material is supplied to the barrel (2), the injection drive unit (40) rotates the injection screw (30) to move the molding material supplied into the interior of the barrel (2) forward (in the direction of the FD arrow), and the molding material moved forward (in the direction of the FD arrow) can be introduced into the interior of the nozzle body (31) through the inlet. The inlet and the outlet (33) can be connected through a connecting passage arranged inside the nozzle body (31). Accordingly, the molten molding material can be introduced into the interior of the nozzle body (31) through the inlet, move through the connecting passage arranged inside the nozzle body (31), and then be discharged to the outside of the nozzle body (31) through the outlet (33). The molding material discharged to the outside of the nozzle part (3) through the discharge port (33) can be supplied to the inside of the molding device (11).The above inlet may be formed in a generally circular hollow shape, but is not necessarily limited thereto, and may be formed in other shapes as long as it allows molding material to be introduced from the barrel (2) into the interior of the nozzle part (3). The above inlet may be formed in a size that is generally larger than the above outlet (33). Accordingly, the flow velocity of the molding material discharged from the above outlet (33) can be implemented at a higher speed than the flow velocity of the molding material introduced from the above inlet. The flow rate of the molding material introduced into the above inlet and the flow rate of the molding material discharged from the above outlet (33) must be equal to each other, because the above inlet is larger than the above outlet (33).

[0034] Referring to FIGS. 2 through 6, the measuring unit (4) is intended to measure the pressure value of the molding device (11) by directly contacting the molding device (11). The measuring unit (4) may be coupled to the front surface (32) of the nozzle unit (3). When the nozzle unit (3) moves forward (in the direction of the FD arrow) and the front surface (32) comes into contact with the molding device (11), the measuring unit (4) may come into contact with the molding device (11). The measuring unit (4) may be configured in various embodiments depending on the shape in which it is positioned on the front surface (32).

[0035] First, in one embodiment of the injection device (1) according to the present invention, the measuring unit (4) may include a first measuring mechanism (41) positioned on one side of the discharge port (33) with respect to a second axis direction (Y-axis direction) perpendicular to a first axis direction (X-axis direction) directed from the nozzle unit (3) toward the barrel (2), and a second measuring mechanism (42) positioned on the other side of the discharge port (33) with respect to the second axis direction (Y-axis direction). The judgment unit (5) can determine whether the nozzle unit (3) and the molding device (11) are aligned by confirming the difference in magnitude between the first pressure value measured by the first measuring mechanism (41) and the second pressure value measured by the second measuring mechanism (42). For example, if the judgment unit (5) determines that the difference in magnitude between the first pressure value and the second pressure value exceeds a preset value, it can determine that the nozzle unit (3) is not aligned with the molding device (11) with respect to the second axis direction (Y-axis direction). For example, if the judgment unit (5) determines that the difference in magnitude between the first input value and the second input value is less than or equal to a preset value, it can determine that the nozzle unit (3) is aligned with the molding device (11) in the second axis direction (Y-axis direction).

[0036] The above measuring unit (4) may include a third measuring device (43) positioned on one side of the discharge port (33) based on a third axis direction (Z axis direction) perpendicular to the first axis direction (X axis direction) and the second axis direction (Y axis direction), and a fourth measuring device (44) positioned on the other side of the discharge port (33) based on the third axis direction (Z axis direction).

[0037] The above judgment unit (5) can determine whether the nozzle unit (3) and the molding device (11) are aligned by checking the difference in magnitude between the third pressure value measured by the third measuring device (43) and the fourth pressure value measured by the fourth measuring device (44). For example, if the judgment unit (5) confirms that the difference in magnitude between the third pressure value and the fourth pressure value exceeds a preset value, it can determine that the nozzle unit (3) is not aligned with the molding device (11) with respect to the third axis direction (Z-axis direction). For example, if the judgment unit (5) confirms that the difference in magnitude between the third input value and the fourth input value is less than or equal to a preset value, it can determine that the nozzle unit (3) is aligned with the molding device (11) with respect to the third axis direction (Z-axis direction).

[0038] The above measuring unit (4) may include all of the first measuring device (41), the second measuring device (42), the third measuring device (43), and the fourth measuring device (44). In this case, the judgment unit (5) can obtain relative position information of the nozzle unit (3) with respect to the molding device (11) using the first pressure value measured by the first measuring device (41), the second pressure value measured by the second measuring device (42), the third pressure value measured by the third measuring device (43), and the fourth pressure value measured by the fourth measuring device (44). This is examined in detail as follows.

[0039] First, the judgment unit (5) obtains an average value for the first pressure value, the second pressure value, the third input value, and the fourth input value.

[0040] Next, the judgment unit (5) obtains a first deviation value obtained by subtracting the average value from the first pressure value, a second deviation value obtained by subtracting the average value from the second pressure value, a third deviation value obtained by subtracting the average value from the third pressure value, and a fourth deviation value obtained by subtracting the average value from the fourth pressure value.

[0041] Next, the judgment unit (5) obtains relative position information of the nozzle unit (3) with respect to the molding device (11) by comparing each of the first deviation value, the second deviation value, the third deviation value, and the fourth deviation value with a preset deviation value. For example, if the absolute value of the first deviation value is less than or equal to the preset deviation value, the judgment unit (5) determines that the point where the first measuring instrument (41) is located in the nozzle unit (3) is aligned with the molding device (11), and if the absolute value of the first deviation value exceeds the preset deviation value, it can determine that the point where the first measuring instrument (41) is located in the nozzle unit (3) is not aligned with the molding device (11). For example, if the absolute value of the first deviation value exceeds a preset deviation value and the first deviation value is positive, the judgment unit (5) may determine that the point where the first measuring instrument (41) is located in the nozzle unit (3) is excessively deviated forward (in the direction of the FD arrow) relative to the molding device (11). For example, if the absolute value of the first deviation value exceeds a preset deviation value and the first deviation value is negative, the judgment unit (5) may determine that the point where the first measuring instrument (41) is located in the nozzle unit (3) is excessively deviated backward (in the direction of the BD arrow) relative to the molding device (11). Although the above explanation was based on the first deviation value, the cases based on the second deviation value, the third deviation value, and the fourth deviation value are approximately similar to the case based on the first deviation value, so a detailed explanation thereof will be omitted. The first measuring device (41), the second measuring device (42), the third measuring device (43), and the fourth measuring device (44) can all be located on a plane parallel to both the second axis direction (Y-axis direction) and the third axis direction (Z-axis direction).The first measuring device (41), the second measuring device (42), the third measuring device (43), and the fourth measuring device (44) may all be positioned on the front surface (32) at equal distances from the discharge port (33). The first measuring device (41), the second measuring device (42), the third measuring device (43), and the fourth measuring device (44) may be positioned so as to be spaced apart from each other at equal angles along the circumferential direction centered on the discharge port (33).

[0042] Next, in another embodiment of the injection device (1) according to the present invention, the measuring unit (4) may include a plurality of measuring instruments spaced apart from the discharge port (33) by the same distance. For example, as shown in FIG. 5, when the measuring unit (4) includes four measuring instruments (41, 42, 43, 44), the measuring instruments (41, 42, 43, 44) may be spaced apart from the discharge port (33) so that the first distance (41a) between the first measuring instrument (41) and the discharge port (33), the second distance (42a) between the second measuring instrument (42) and the discharge port (33), the third distance (43a) between the third measuring instrument (43) and the discharge port (33), and the fourth distance (44a) between the fourth measuring instrument (44) and the discharge port (33) are all of the same size. The above measuring instruments may be positioned so as to be spaced apart from each other at equal angles along the circumferential direction (CD) centered on the outlet (33). For example, as shown in FIG. 5, when the measuring unit (4) includes four measuring instruments (41, 42, 43, 44), the measuring instruments (41, 42, 43, 44) may be positioned so that the first angle (41b) between the first measuring instrument (41) and the third measuring instrument (43), the second angle (42b) between the second measuring instrument (42) and the fourth measuring instrument (44), the third angle (43b) between the third measuring instrument (43) and the second measuring instrument (42), and the fourth angle (44b) between the fourth measuring instrument (44) and the first measuring instrument (41) all have the same size. The measuring unit (4) may be formed symmetrically along the second axis direction (Y-axis direction) and the third axis direction (Z-axis direction). Meanwhile, the judgment unit (5) may obtain a nozzle touch pressure by summing multiple pressure values ​​measured by the multiple measuring instruments. The operator may adjust the position of the nozzle unit (3) using the nozzle touch pressure obtained by the judgment unit (5) so as to appropriately maintain the connection force between the nozzle unit (3) and the molding device (11).For example, if the nozzle touch pressure obtained by the judgment unit (5) is confirmed to be greater than or equal to a preset nozzle touch pressure, the nozzle unit (3) is in a state of excessively pressurizing the molding device (11), so the operator can reduce the contact force between the nozzle unit (3) and the molding device (11) by moving the nozzle unit (3) backward (in the direction of the BD arrow). For example, if the nozzle touch pressure obtained by the judgment unit (5) is confirmed to be less than a preset nozzle touch pressure, the operator can increase the contact force between the nozzle unit (3) and the molding device (11) by moving the nozzle unit (3) forward (in the direction of the FD arrow). Accordingly, the injection device (1) according to the present invention can improve the accuracy of the nozzle touch pressure obtained by the judgment unit (5), thereby improving the accuracy of the operation in which the operator properly maintains the contact force between the nozzle unit (3) and the molding device (11). Meanwhile, the judgment unit (5) can determine whether the nozzle unit (3) and the molding device (11) are aligned by checking the deviation of the multiple pressure values ​​measured by the multiple measuring instruments. This is examined in detail as follows.

[0043] First, the judgment unit (5) obtains deviation values ​​by subtracting the average value of the pressure values ​​from each of the plurality of pressure values ​​measured by the plurality of measuring instruments.

[0044] Next, the judgment unit (5) can determine that if the absolute value of the obtained deviation value is less than or equal to a preset deviation value, the point where the corresponding measuring instruments are located is in a state where the nozzle part (3) is aligned with the molding device (11). Meanwhile, if the absolute value of the obtained deviation value exceeds a preset deviation value, the judgment unit (5) can determine that the point where the corresponding measuring instruments are located is in a state where the nozzle part (3) is not aligned with the molding device (11). For example, the above judgment unit (5) can determine that if the sign of the obtained deviation value is positive, the nozzle unit (3) is not aligned with the molding device (11) because the point where the corresponding measuring instruments are located in the nozzle unit (3) is excessively deviated forward (in the direction of the FD arrow) relative to the molding device (11), and if the sign of the obtained deviation value is negative, the nozzle unit (3) is not aligned with the molding device (11) because the point where the corresponding measuring instruments are located in the nozzle unit (3) is excessively deviated backward (in the direction of the FD arrow) relative to the molding device (11).

[0045] Although the above description explains that there are four measuring instruments, it is not limited thereto, and the measuring instruments may be formed with two, three, or five or more.

[0046] Referring to FIGS. 4 and 6, the nozzle part (3) may include a guide surface (34) for guiding the position of the nozzle body (31) relative to the molding device (11). One side of the guide surface (34) may be connected to the front surface (32), and the other side may be connected to the nozzle body (31). The front surface (32) may be connected to the nozzle body (31) through the guide surface (34) at a position spaced forward (in the direction of the FD arrow) from the nozzle body (31). The guide surface (34) may be formed such that its area decreases as it extends from the nozzle body (31) to the front surface (32). The front surface (32) may be formed to have a smaller area than the nozzle body (31) based on a plane parallel to both the second axis direction (Y-axis direction) and the third axis direction (Z-axis direction). Accordingly, the guide surface (34) may be formed to be inclined inward as it extends forward (in the direction of the FD arrow). For example, the guide surface (34) may be formed in the shape of a truncated cone.

[0047] Accordingly, the injection device (1) according to the present invention can be implemented such that even if the nozzle body (31) is coupled in a misaligned state with respect to the molding device (11), the nozzle body (31) moves along the guide surface (34) to be aligned with respect to the molding device (11). Therefore, the injection device (1) according to the present invention can improve the ease and convenience of aligning the nozzle part (3) with respect to the molding device (11).

[0048] Referring to FIGS. 2 to 7, the injection device (1) according to the present invention may include the injection body (20) and a moving part (6) that moves the injection body (20).

[0049] The injection body (20) supports the barrel (2) and the injection drive unit (40). The injection body (20) may move in part or in whole so that the position of the barrel (2) is changed. As the injection body (20) moves and the position of the barrel (2) changes, the position of the nozzle unit (3) coupled to the barrel (2) may also change.

[0050] The above moving unit (6) moves the injection body (20). By moving the injection body (20), the moving unit (6) can change the position of the nozzle unit (3) coupled to the barrel (2). The moving unit (6) can move the injection body (20) according to the position information obtained by the judgment unit (5). Accordingly, the nozzle unit (3) coupled to the barrel (2) can move to a position where it can be connected to the molding device (11). An example of how the moving unit (6) moves the injection body (20) is described in detail as follows.

[0051] First, when the nozzle part (3) is connected to the molding device (11), the measuring part (4) coupled to the front surface (32) of the nozzle part (3) measures the pressure value for the molding device (11).

[0052] Next, the judgment unit (5) obtains the nozzle touch pressure using the pressure value measured by the measurement unit (4).

[0053] Next, if the nozzle touch pressure exceeds the preset nozzle touch pressure, the moving part (6) can reduce the degree to which the nozzle part (3) presses the molding device (11) by moving the nozzle part (3) backward (in the direction of the BD arrow), and if the nozzle touch pressure is less than the preset nozzle touch pressure, the moving part (6) can increase the degree to which the nozzle part (3) presses the molding device (11) by moving the nozzle part (3) forward (in the direction of the FD arrow).

[0054] In this way, the moving part (6) can be implemented such that the nozzle part (3) is moved based on the nozzle touch pressure, thereby connecting the nozzle part (3) to the molding device (11) while the nozzle part (3) appropriately presses the molding device (11). Another embodiment in which the moving part (6) moves the injection body (20) is described in detail as follows.

[0055] First, the judgment unit (5) obtains deviation values ​​by subtracting the average value of the pressure values ​​from each of the multiple pressure values ​​measured by multiple measuring instruments.

[0056] Next, if the absolute value of the acquired deviation value exceeds a preset deviation value, if the sign of the acquired deviation value is negative, the moving unit (6) moves the nozzle unit (3) so that the point where the corresponding measuring instrument is located in the nozzle unit (3) moves forward (in the direction of the FD arrow), and if the sign of the acquired deviation value is positive, the moving unit (6) moves the nozzle unit (3) so that the point where the corresponding measuring instrument is located in the nozzle unit (3) moves backward (in the direction of the BD arrow). If the absolute value of the acquired deviation value is less than or equal to the preset deviation value, the moving unit (6) does not move the nozzle unit (3).

[0057] Next, multiple measuring instruments re-measure the pressure value for the molding device. The judgment unit (5) re-performs the above-described operation using the re-measured pressure value.

[0058] In this way, the moving part (6) can adjust the position of the nozzle part (3) so that the nozzle part (3) is connected at a position where it is aligned with the molding device (11).

[0059] It will be obvious to those skilled in the art that the invention described above is not limited to the aforementioned embodiments and attached drawings, and that various substitutions, modifications, and changes are possible within the scope of the technical concept of the invention. Explanation of the symbols

[0060] 1 : Injection device 2 : Barrel 3 : Nozzle section 4 : Measuring section 5 : Judgment unit 6 : Movement unit 10 : Injection molding machine 20 : Injection body 30 : Injection screw 31 : Nozzle body 32: Front side 33: Outlet 34 : Guide surface 40 : Injection drive unit

Claims

Claim 1 An injection device comprising: a barrel for supplying a molding material; an injection screw located inside the barrel; an injection drive unit for driving the injection screw; a nozzle unit coupled to the barrel; a measuring unit coupled to the front surface of the nozzle unit and for measuring a pressure value, which is the magnitude of the pressure applied to the molding device as the nozzle unit pressurizes the molding device; and a judgment unit for determining the connection state between the nozzle unit and the molding device using the pressure value when the measuring unit directly contacts the molding device to measure the pressure value. Claim 2 An injection device according to claim 1, wherein the nozzle part includes an outlet for discharging molding material supplied from the barrel to the outside, and the measuring part includes a plurality of measuring instruments spaced apart from the outlet by the same distance, and the measuring instruments are positioned so as to be spaced apart from each other at the same angle along the circumferential direction centered on the outlet. Claim 3 In paragraph 2, the injection device is characterized in that the judgment unit obtains a nozzle touch pressure by summing a plurality of pressure values ​​measured by the plurality of measuring instruments. Claim 4 In paragraph 2, the injection device is characterized in that the judgment unit determines whether the nozzle unit and the molding device are aligned by checking the deviation of a plurality of pressure values ​​measured by the plurality of measuring instruments. Claim 5 In claim 1, the nozzle part includes an outlet for discharging molding material supplied from the barrel to the outside, and the measuring part includes a first measuring instrument disposed on one side of the outlet based on a second axis direction (Y-axis direction) perpendicular to a first axis direction (X-axis direction) directed from the nozzle part toward the barrel, a second measuring instrument disposed on the other side of the outlet based on the second axis direction (Y-axis direction), a third measuring instrument disposed on one side of the outlet based on a third axis direction (Z-axis direction) perpendicular to the first axis direction (X-axis direction) and the second axis direction (Y-axis direction), and a fourth measuring instrument disposed on the other side of the outlet based on the third axis direction (Z-axis direction), and the judgment part uses a first pressure value measured by the first measuring instrument, a second pressure value measured by the second measuring instrument, a third pressure value measured by the third measuring instrument, and a fourth pressure value measured by the fourth measuring instrument to determine the relative pressure of the nozzle part with respect to the molding device An injection device characterized by acquiring position information.

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