Mould closing driving mechanism of electric injection molding machine and electric injection molding machine

Abstract

The utility model discloses an electric injection molding machine mold closing driving mechanism and an electric injection molding machine, the electric injection molding machine mold closing driving mechanism comprises a fixed mold, a movable mold, a ball screw assembly, a first driving device and a second driving device, the ball screw assembly is connected with the movable mold; and the first driving device and the second driving device simultaneously drive the ball screw assembly to act so as to realize mold closing and mold opening of the movable mold and the fixed mold. According to the mold closing driving mechanism of the electric injection molding machine and the electric injection molding machine, the first driving device and the second driving device are adopted to simultaneously drive the ball screw assembly to act so as to realize mold closing and mold opening of the movable mold and the fixed mold, the single driving device can select relatively low power and torque, the single mounting space is relatively small, the overall structure is relatively compact, and the cost is low. And a small-sized driving device is easier to purchase, so that the cost is lower.

Description

Technical Field

[0001] The utility model relates to an injection molding machine, in particular to a mold clamping driving mechanism of an all-electric injection molding machine and an all-electric injection molding machine. Background Art

[0002] The all-electric injection molding machine has the characteristics of high precision, high efficiency, high stability and high energy saving, and has gradually replaced the hydraulic injection molding machine to produce higher quality products. Moreover, the all-electric injection molding machine has a development trend from small to large.

[0003] At present, the driving mechanism of the mold clamping part of the all-electric injection molding machine generally consists of a servo motor, a ball screw and a bearing device, etc., and provides the clamping force through the amplification of the machine hinge. The greater the clamping force, the greater the power and torque of the servo motor. However, after the servo motor is increased to a certain extent, the available models and specifications are less, the universality is poor, the delivery period is long and the cost is expensive. At the same time, its external dimension is large, the weight is increased, the moment of inertia is increased, the response becomes slower, the precision is decreased, and the power of the servo driver for controlling the motor also needs to become very large.

[0004] In addition, at present, the bearing device of the electric mold clamping driving mechanism generally adopts the arrangement mode of multiple angular contact bearings. For a large mold clamping structure, there are disadvantages such as high cost and long axial length.

[0005] Therefore, the existing driving structure of the mold clamping of the all-electric injection molding machine is not suitable for the mold clamping device of the large all-electric injection molding machine in terms of overall performance, cost, external dimension and installation convenience. Summary of the Invention

[0006] The utility model aims at the above technical problems and provides a mold clamping driving mechanism of an all-electric injection molding machine and an all-electric injection molding machine, which have the characteristics of high precision, fast response, compact overall structure and convenient installation. At the same time, key components such as servo motors, drivers and bearings are easy to purchase and have low costs.

[0007] To achieve the above object, the technical solution of the utility model is:

[0008] A mold clamping driving mechanism of an all-electric injection molding machine, including a fixed mold and a movable mold, is characterized in that: it further includes a ball screw assembly, a first driving device and a second driving device. The ball screw assembly is connected to the movable mold, and the first driving device and the second driving device simultaneously drive the ball screw assembly to act to realize the mold clamping and mold opening of the movable mold and the fixed mold.

[0009] The above-mentioned clamping drive mechanism of the electric injection molding machine adopts two sets of drive devices, namely the first drive device and the second drive device, to simultaneously drive the ball screw assembly to act, so as to realize the clamping and opening of the moving mold and the fixed mold. A single drive device can select a smaller power and torque, has a smaller single installation space, the overall structure will be relatively compact, is convenient for installation, and smaller drive devices are easier to purchase and have lower costs.

[0010] In a further optimized solution, the ball screw assembly includes a ball screw, a screw nut and a drive wheel. One end of the ball screw is provided with the screw nut, and the other end is connected to the drive wheel. The drive wheel rotates to drive the ball screw to rotate, and the screw nut moves back and forth on the ball screw. The screw drive mechanism has high precision and is easy to control.

[0011] In a further optimized solution, the first drive device includes a first servo motor, a first driving wheel and a first synchronous belt that cooperate with each other; the second drive device includes a second servo motor, a second driving wheel and a second synchronous belt that cooperate with each other; the first synchronous belt and the second synchronous belt are respectively connected to the drive wheel. The servo motor drives with high precision and fast action response. The double servo motor drive can achieve the output of high power and large torque.

[0012] In a further optimized solution, it includes a fixed template, a moving template, a tail plate and guide columns; the fixed mold is installed on the fixed template, and the moving mold is installed on the moving template; using the fixed template to fix the fixed mold and the moving template to fix the moving mold is convenient for installation;

[0013] The guide columns connect the fixed template and the tail plate, and the moving template is arranged between the tail plate and the fixed template and is slidably arranged on the guide columns. Using the guide columns is convenient for installing the fixed template and the tail plate and guiding the movement of the moving template.

[0014] In a further optimized solution, it includes a bearing device. The bearing device is sleeved on the ball screw and installed on the tail plate. The bearing device enables the ball screw to be rotatably fixed on the tail plate and bears the axial force during clamping and opening.

[0015] In a further optimized solution, the first drive device and the second drive device are respectively arranged on both sides of the tail plate. Fixing the first drive device and the second drive device on both sides of the tail plate can drive the ball screw assembly to act evenly, and is beneficial to the optimization of the installation layout.

[0016] In a further optimized solution, it includes a crosshead and a toggle mechanism assembly. The crosshead is connected to the screw nut, and the toggle mechanism assembly is connected to the crosshead and the moving template. The ball screw rotates, driving the screw nut to drive the crosshead to move back and forth along the axis of the ball screw; the crosshead drives the toggle mechanism assembly to move, and the toggle mechanism assembly drives the moving template and the moving mold to move.

[0017] Further optimization solution: The bearing device includes a tapered roller bearing, a spherical roller thrust bearing, a radial bearing, a bearing housing and a bearing spacer sleeve. The tapered roller bearing, the spherical roller thrust bearing and the radial bearing are respectively installed in the bearing housing; the spherical roller thrust bearing and the radial bearing are respectively sleeved on the bearing spacer sleeve, and the tapered roller bearing and the bearing spacer sleeve are arranged on the ball screw. The spherical roller thrust bearing bears the axial force when the mold is locked, and the tapered roller bearing bears the axial force when the mold is opened. Compared with multiple angular contact bearings, a single spherical roller thrust bearing can bear a larger axial force.

[0018] Further optimization solution: The ball screw is provided with a screw shaft step, and the inner hole of the bearing spacer sleeve is provided with a spacer step surface, and the spacer step surface fits the screw shaft step. The axial force when the mold is locked and the preload force of the bearing are transmitted through the two coincident step surfaces.

[0019] An electric injection molding machine includes the electric injection molding machine clamping drive mechanism described in any one of the above.

[0020] The utility model has the following technical advantages compared with the prior art:

[0021] 1. The electric injection molding machine clamping drive mechanism and the electric injection molding machine adopt two servo motors with smaller specifications and corresponding drivers, which have the characteristics of high precision, fast response, compact overall structure and convenient installation. At the same time, the servo motors and drivers are easy to purchase, have strong versatility and low cost;

[0022] 2. The electric injection molding machine clamping drive mechanism and the electric injection molding machine adopt conventional bearings, which have high installation accuracy, strong support rigidity, short axial length, are easy to purchase, and at the same time reduce the cost of the bearing device. Description of the drawings

[0023] Figure 1 is a sectional view of a specific embodiment of the electric injection molding machine clamping drive mechanism of the utility model;

[0024] Figure 2 is Figure 1 an assembly schematic diagram of the electric injection molding machine clamping drive mechanism and the injection molding machine mold clamping parts.

[0025] In the figure: ball screw assembly A, first driving device B, second driving device C, first servo motor 1, first driving wheel 2, first synchronous belt 3, second servo motor 4, second driving wheel 5, second synchronous belt 6, driving wheel 7, bearing device 8, radial bearing 8a, spherical roller thrust bearing 8b, tapered roller bearing 8c, bearing spacer 8d, bearing housing 8e, spacer step surface 8f, screw shaft step 8g, ball screw 9, screw nut 10, crosshead 11, fixed mold 12, fixed template 12a, moving mold 13, moving template 13a, guide post 14, toggle assembly 15, tail plate 16. Detailed implementation mode

[0026] The present invention will be further described in detail below with reference to the embodiments in the accompanying drawings.

[0027] As Figure 1 And Figure 2 shown, a specific embodiment of the mold clamping drive mechanism of the electric injection molding machine of the present invention.

[0028] As Figure 1 And Figure 2 shown, the mold clamping drive mechanism of the electric injection molding machine of this embodiment includes a fixed mold 12 and a moving mold 13, and also includes a ball screw assembly A, a first driving device B and a second driving device C. The ball screw assembly A is connected to the moving mold 13, and the first driving device B and the second driving device C simultaneously drive the ball screw assembly A to act to realize the mold clamping and mold opening of the moving mold 13 and the fixed mold 12.

[0029] The mold clamping drive mechanism of this electric injection molding machine uses two sets of driving devices, namely the first driving device and the second driving device, to simultaneously drive the ball screw assembly to realize the mold clamping and mold opening of the moving mold and the fixed mold. A single driving device can select a smaller power and torque, and the single installation space is smaller. The overall structure will be relatively compact, which is convenient for installation. Smaller driving devices are easier to purchase and have lower costs.

[0030] As Figure 1 And Figure 2 shown, the ball screw assembly A includes a ball screw 9, a screw nut 10 and a driving wheel 7. One end of the ball screw 9 is provided with a screw nut 10, and the other end is connected to the driving wheel 7. The driving wheel 7 rotates to drive the ball screw 9 to rotate, and the screw nut 10 moves back and forth on the ball screw 9. The screw drive mechanism has high precision and is easy to control.

[0031] As Figure 1As shown in the figure, the first driving device B includes a first servo motor 1, a first driving wheel 2 and a first synchronous belt 3 which cooperate with each other; the second driving device C includes a second servo motor 4, a second driving wheel 5 and a second synchronous belt 6 which cooperate with each other; the first synchronous belt 3 and the second synchronous belt 6 are respectively connected to a driving wheel 7. The servo motor has high driving motion precision and fast action response, and the dual servo motor drive can achieve high-power and high-torque output.

[0032] As Figure 2 shown in the figure, the die clamping driving mechanism of the electric injection molding machine in this embodiment includes a fixed template 12a, a movable template 13a, a tail plate 16 and guide columns 14; a fixed die 12 is installed on the fixed template 12a, and a movable die 13 is installed on the movable template 13a; the fixed template 12a is used to fix the fixed die 12, and the movable template 13a is used to fix the movable die 13, which is convenient for installation.

[0033] As Figure 2 shown in the figure, the guide columns 14 are connected to the fixed template 12a and the tail plate 16, and the movable template 13a is arranged between the tail plate 16 and the fixed template 12a and is slidably arranged on the guide columns 14. The use of the guide columns 14 facilitates the installation of the fixed template 12a and the tail plate 16 and the movement guidance of the movable template 13a.

[0034] As Figure 1 shown in the figure, the die clamping driving mechanism of the electric injection molding machine in this embodiment includes a bearing device 8, and the bearing device 8 is sleeved on a ball screw 9 and installed on the tail plate 16. The bearing device 8 enables the ball screw 9 to be rotatably fixed on the tail plate 16 and bears the axial force during die clamping and mold opening.

[0035] As Figure 1 shown in the figure, the bearing device 8 includes a tapered roller bearing 8c, a spherical roller thrust bearing 8b, a radial bearing 8a, a bearing housing 8e and a bearing spacer 8d. The tapered roller bearing 8c, the spherical roller thrust bearing 8b and the radial bearing 8a are respectively installed in the bearing housing 8e; the spherical roller thrust bearing 8b and the radial bearing 8a are respectively sleeved on the bearing spacer 8d, and the tapered roller bearing 8c and the bearing spacer 8d are arranged on the ball screw 9. The spherical roller thrust bearing bears the axial acting force during mold locking, and the tapered roller bearing 8c bears the axial acting force during mold opening. Compared with multiple angular contact bearings, a single spherical roller thrust bearing 8b can bear a large axial force.

[0036] As Figure 1 shown in the figure, the first driving device B and the second driving device C are respectively arranged on both sides of the tail plate 16. Fixing the first driving device B and the second driving device C on both sides of the tail plate 16 can drive the ball screw assembly A to act evenly, and is beneficial to the optimization of the installation layout.

[0037] As Figure 2As shown in the figure, the mold clamping drive mechanism of the electric injection molding machine in this embodiment includes a crosshead 11 and a toggle component 15. The crosshead 11 is connected to a lead screw nut 10, and the toggle component 15 is connected to the crosshead 11 and a moving template 13a. The ball screw 9 rotates to drive the lead screw nut 10 to drive the crosshead 11 to move back and forth along the axis of the ball screw 9; the crosshead 11 drives the toggle component 15 to move, and the toggle component 15 drives the moving template 13a and the moving mold 13 to move.

[0038] As Figure 1 shown in the figure, the ball screw 9 is provided with a screw shaft step 8g, and an inner hole of a bearing spacer 8d is provided with a spacer step surface 8f, and the spacer step surface 8f fits the screw shaft step 8g. The axial force during mold locking and the preload force of the bearing are transmitted through the two coincident step surfaces.

[0039] As Figure 1 and Figure 2 shown in the figure, the first servo motor 1 and the second servo motor 4 rotate simultaneously, and drive the ball screw 9 to rotate through synchronous pulleys and a synchronous belt, driving the lead screw nut 10 to drive the crosshead 11 to move back and forth along the axis of the ball screw 9. The crosshead 11 drives the toggle component 15 to move, and the toggle component 15 drives the moving template 13a and the moving mold 13 to move. When the moving mold 13 starts to contact the fixed mold 12, the servo motor continues to rotate and outputs the maximum torque at the same time. The mechanical parts produce elastic deformation and the toggle component 15 produces a magnifying force, so that a mold clamping force is generated between the moving template 13a and the fixed template 12a, and the moving mold 13 and the fixed mold 12 are further locked. When the crosshead 11 moves in the reverse direction, the distance between the moving mold 13 and the fixed mold 12 can be enlarged to realize the mold opening action. The two servo motors rotate simultaneously, which can output a larger torque and resultant force, ensuring that a large enough mold clamping force is generated. Compared with a large servo motor, the two servo motors have a low inertia, fast response, low current generated during acceleration and deceleration, and can achieve a faster mold opening and closing speed and provide more accurate position accuracy.

[0040] The present invention also discloses an electric injection molding machine, including the above-mentioned mold clamping drive mechanism of the electric injection molding machine.

[0041] The mold clamping drive mechanism of the electric injection molding machine and the electric injection molding machine adopt two servo motors and corresponding drivers with smaller specifications, and have the characteristics of high precision, fast response, compact overall structure and convenient installation. At the same time, the servo motors and drivers are easy to purchase, have strong versatility and low cost; conventional bearings are used, with high installation accuracy, strong support rigidity, short axial length, easy to purchase, and at the same time, the cost of the bearing device is reduced.

[0042] In summary, as described in the specification and illustrated in the drawings, the practical sample of the present utility model has been made and tested through multiple uses. From the test results, it is proved that the present utility model can achieve the expected purpose, and its practicability is beyond doubt. The above-mentioned embodiments are only used to conveniently illustrate the content of the present utility model and do not impose a formal limitation on it; any equivalent embodiments made by those with common general knowledge in the technical field, without departing from the scope of the technical features and similar features proposed by the present utility model, and making partial changes or modifications using the technical content disclosed by the present utility model, all fall within the protection scope of the present utility model.

Claims

1. A clamping drive mechanism for an electric injection molding machine, comprising a fixed mold (12) and a movable mold (13), characterized in that: It further includes a ball screw assembly (A), a first driving device (B), and a second driving device (C). The ball screw assembly (A) is connected to the moving mold (13), and the first driving device (B) and the second driving device (C) simultaneously drive the ball screw assembly (A) to act to realize the mold closing and mold opening of the moving mold (13) and the fixed mold (12).

2. The clamping drive mechanism of the electric injection molding machine according to claim 1, characterized in that, The ball screw assembly (A) includes a ball screw (9), a screw nut (10), and a driving wheel (7). One end of the ball screw (9) is provided with the screw nut (10), and the other end is connected to the driving wheel (7).

3. The clamping drive mechanism of the electric injection molding machine according to claim 2, characterized in that, The first driving device (B) includes a first servo motor (1), a first driving wheel (2), and a first synchronous belt (3) that cooperate with each other; the second driving device (C) includes a second servo motor (4), a second driving wheel (5), and a second synchronous belt (6) that cooperate with each other; the first synchronous belt (3) and the second synchronous belt (6) are respectively connected to the driving wheel (7).

4. The mold clamping drive mechanism of the electric injection molding machine according to claim 2, characterized in that It includes a fixed template (12a), a moving template (13a), a tail plate (16), and a guiding column (14); the fixed mold (12) is installed on the fixed template (12a), and the moving mold (13) is installed on the moving template (13a). The guiding column (14) connects the fixed template (12a) and the tail plate (16), and the moving template (13a) is arranged between the tail plate (16) and the fixed template (12a) and is slidably arranged on the guiding column (14).

5. The clamping drive mechanism of the electric injection molding machine according to claim 4, characterized in that It includes a bearing device (8). The bearing device (8) is sleeved on the ball screw (9) and is installed on the tail plate (16).

6. The clamping drive mechanism of the electric injection molding machine according to claim 4, characterized in that, The first driving device (B) and the second driving device (C) are respectively arranged on both sides of the tail plate (16).

7. The clamping drive mechanism of the electric injection molding machine according to claim 4, characterized in that, It includes a crosshead (11) and a toggle mechanism assembly (15). The crosshead (11) is connected to the screw nut (10), and the toggle mechanism assembly (15) is connected to the crosshead (11) and the moving template (13a).

8. The clamping drive mechanism of the electric injection molding machine according to claim 5, characterized in that The bearing device (8) includes a tapered roller bearing (8c), a spherical roller thrust bearing (8b), a radial bearing (8a), a bearing housing (8e), and a bearing spacer (8d). The tapered roller bearing (8c), the spherical roller thrust bearing (8b), and the radial bearing (8a) are respectively installed in the bearing housing (8e); the spherical roller thrust bearing (8b) and the radial bearing (8a) are respectively sleeved on the bearing spacer (8d), and the tapered roller bearing (8c) and the bearing spacer (8d) are arranged on the ball screw (9).

9. The clamping drive mechanism of the electric injection molding machine according to claim 8, characterized in that, The ball screw (9) is provided with a screw shaft step (8g), and the inner hole of the bearing spacer (8d) is provided with a spacer step surface (8f). The spacer step surface (8f) fits the screw shaft step (8g).

10. An electric injection molding machine, characterized in that: It includes the mold closing driving mechanism of the electric injection molding machine according to any one of claims 1 to 9.

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