Die casting machine locking mechanism and die casting machine

Abstract

The utility model relates to the die casting technical field discloses a kind of die casting machine lock mechanism and die casting machine, and die casting machine lock mechanism includes: fixed seat, first mounting hole is arranged on it;Locking oil cylinder, including cylinder and piston, the cylinder is fixedly arranged, the cylinder and the piston are arranged with the second mounting hole coaxial with the first mounting hole;Linkage cylinder, rotation is arranged in the first mounting hole and second mounting hole, inner wall is provided with internal thread, outer wall is formed with the convex part that the piston is linked;Lead screw, screw connection is in the linkage cylinder, the lead screw's protruding direction is identical with the protruding direction of the piston;Driving motor, output shaft is coaxially arranged with the linkage cylinder, and one end of the output shaft is connected with the linkage cylinder.This die casting machine lock mechanism, by driving motor and locking oil cylinder cooperation drive movable die plate moves and applies locking force to movable die plate, to be able to realize high-precision control of locking position and locking force.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, specifically to a die casting machine clamping mechanism and a die casting machine. Background Technology

[0002] Existing die-casting machines typically employ hydraulic cylinders to drive the mold-opening and locking system, enabling mold plate movement and applying locking force. However, the compressibility of the hydraulic medium in the system during operation affects the position control accuracy and locking force control accuracy of the hydraulic cylinders when driving the mold plate, making it difficult to meet the requirements of high-precision die-casting processes.

[0003] Furthermore, to balance the large clamping force and long clamping stroke, existing technologies typically require the addition of a force amplification mechanism. This type of structure not only increases the complexity of the clamping mechanism but also easily leads to a decrease in overall structural strength, thereby affecting the stability and service life of the equipment. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a die-casting machine clamping mechanism and a die-casting machine. By cooperating with a drive motor and a clamping cylinder, the moving mold plate is moved and clamping force is applied to it, thereby achieving high-precision control of the clamping position and clamping force. Simultaneously, this clamping mechanism eliminates the need for additional complex force amplification mechanisms, ensuring both a large clamping force and clamping stroke while also improving overall structural strength and operational stability.

[0005] According to one embodiment of the present invention, a die-casting machine clamping mechanism is provided, comprising: a fixed base having a first mounting hole thereon; a clamping cylinder including a cylinder body and a piston, the cylinder body being fixedly disposed, and the cylinder body and the piston having a second mounting hole coaxial with the first mounting hole; a linkage cylinder rotatably disposed in the first mounting hole and the second mounting hole, having an internal thread on its inner wall and a protrusion on its outer wall that is connected to the piston; a lead screw threadedly connected to the linkage cylinder, the extension direction of the lead screw being the same as the extension direction of the piston; and a drive motor having an output shaft coaxial with the linkage cylinder, one end of the output shaft being connected to the linkage cylinder.

[0006] In one embodiment, a first bearing is provided between the fixed base and the linkage cylinder, and a cover is provided at the outer end of the first mounting hole to abut against the first bearing.

[0007] In one embodiment, a second bearing is provided between the protrusion and the piston, and a third bearing is provided at the end of the linkage cylinder near the drive motor. The outer ring of the third bearing abuts against the inner wall of the cylinder body, and the inner ring abuts against the outer wall of the linkage cylinder.

[0008] As one embodiment, a fourth bearing is provided between the protrusion and the fixed base.

[0009] As one embodiment, a return spring is provided between the fixed base and the fourth bearing.

[0010] According to one embodiment of the present invention, a die-casting machine is provided, comprising: a movable template slidably disposed on a frame; and a die-casting machine locking mechanism as described above, wherein one end of the lead screw away from the drive motor is connected to the movable template.

[0011] In one embodiment, a slider is provided between the lead screw and the moving template, the slider is rotatably disposed at the end of the lead screw, and a slide rail is provided on the frame for the slider to slide.

[0012] Based on the above description and practical application, the die-casting machine clamping mechanism of this invention uses a drive motor and a clamping cylinder to drive the moving platen and apply clamping force to it. When the moving platen needs to move to a preset position, the drive motor drives the linkage cylinder to rotate, which in turn drives the lead screw within it to extend forward along its own axis, pushing the moving platen until it reaches the preset position. This allows for rapid adjustment of the clamping position under low load conditions. Afterward, the clamping cylinder uses hydraulic pressure to drive the piston to move, causing the piston to press tightly against the linkage cylinder, and then indirectly locks the moving platen in the current position via the lead screw. During this process, the piston of the clamping cylinder does not need to output a large displacement, thus eliminating the need for a complex force amplification mechanism. By utilizing the cooperation of the drive motor and the clamping cylinder, high-precision control of the clamping position and clamping force can be achieved, ensuring a large clamping force and clamping stroke while also improving the overall structural strength and operational stability.

[0013] The lead screw, linkage cylinder, mold-locking cylinder and drive motor in the mold-locking mechanism of the die-casting machine are set coaxially, which makes the lead screw more stable when driving the moving mold plate to move, and the force between the structures is more uniform, which can improve the control accuracy of mold-locking position and mold-locking force. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the die-casting machine clamping mechanism in one embodiment of the present invention.

[0015] Figure 2 This is a cross-sectional structural schematic diagram of the die-casting machine clamping mechanism involved in one embodiment of the present utility model.

[0016] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0017] The attached figures are labeled as follows: 1. Fixed base; 11. First mounting hole; 12. Cover; 2. Mold locking cylinder; 21. Cylinder body; 22. Piston; 23. Second mounting hole; 3. Linkage cylinder; 31. Protrusion; 4. Lead screw; 5. Drive motor; 51. Output shaft; 52. Splined shaft; 53. Adjusting wheel; 61. First bearing; 62. Second bearing; 63. Third bearing; 64. Fourth bearing; 7. Return spring. Detailed Implementation

[0018] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0019] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 1 to 3 As shown in the figure, in this embodiment, a die-casting machine locking mechanism is disclosed, which is mainly composed of a fixed base 1, a locking cylinder 2, a linkage cylinder 3, a lead screw 4 and a drive motor 5 coaxially assembled.

[0022] The fixed base 1 is the basic support component of the mold locking mechanism and is fixedly installed on the frame of the die casting machine. The fixed base 1 has a through first mounting hole 11 in the middle for mounting and supporting the linkage cylinder 3, so that the linkage cylinder 3 can rotate stably relative to the fixed base 1.

[0023] The mold-locking cylinder 2 includes a cylinder body 21 and a piston 22. The cylinder body 21 is fixedly installed, and its axis is coaxial with the first mounting hole 11 of the fixed base 1. Both the cylinder body 21 and the piston 22 are provided with second mounting holes 23, which are coaxially connected with the first mounting hole 11, forming a channel through which the linkage cylinder 3 passes. When the mold-locking cylinder 2 is working, hydraulic oil is injected into the cylinder body 21, driving the piston 22 to extend axially to apply axial pressure to the linkage cylinder 3.

[0024] The linkage cylinder 3 is a hollow cylindrical structure, rotatably mounted in the first mounting hole 11 of the fixed base 1 and the second mounting hole 23 of the mold-locking cylinder 2. The inner wall of the linkage cylinder 3 is provided with internal threads for the lead screw 4 to be screwed in for connection; the outer wall of the linkage cylinder 3 forms a radially protruding protrusion 31, which is located inside the cylinder body 21 and forms an axial linkage relationship with the piston 22. When the piston 22 extends, it can press against the protrusion 31, thereby driving the linkage cylinder 3 and the lead screw 4 to generate axial displacement, realizing the transmission of mold-locking force.

[0025] The lead screw 4 is threaded into the linkage cylinder 3, and its extension direction is the same as that of the piston 22, pointing towards the moving template side. When the linkage cylinder 3 rotates under the drive of the drive motor 5, the lead screw 4 extends or retracts along its own axis due to the action of the threaded pair, thereby pushing or releasing the moving template.

[0026] The output shaft 51 of the drive motor 5 is coaxially arranged with the linkage cylinder 3. One end of the output shaft 51 is fixedly connected to the linkage cylinder 3, which is used to drive the linkage cylinder 3 to rotate around its axis, and then drive the lead screw 4 to move forward and backward through the threaded pair. The drive motor 5 is preferably a servo motor, which can realize precise control of the rotation angle of the linkage cylinder 3, thereby precisely controlling the extension amount of the lead screw 4, and finally realizing high-precision adjustment of the position of the moving template.

[0027] The specific steps of the die-casting machine's mold-locking mechanism during mold-locking operations are as follows: First, the drive motor 5 drives the linkage cylinder 3 to rotate, causing the lead screw 4 to extend axially and push the moving mold plate towards the fixed mold plate until the moving mold plate reaches the preset mold-closing position. Then, high-pressure hydraulic oil is injected into the mold-locking cylinder 2, and the piston 22 extends axially and presses against the protrusion 31 of the linkage cylinder 3. The moving mold plate is indirectly locked and fixed through the linkage cylinder 3 and the lead screw 4, generating the required mold-locking force between the moving and fixed mold plates. In the mold-locked state, the mold-locking force is transmitted from the piston 22 through the protrusion 31, the linkage cylinder 3, and the lead screw 4 to the moving mold plate. No force amplification mechanism is needed throughout the process, resulting in a simple and compact structure. After mold-locking is completed, injection molding can begin. To release the mold, the hydraulic oil is released, and the drive motor 5 reverses to drive the linkage cylinder 3 to retract the lead screw 4. The moving mold plate then retracts, completing the mold-opening action.

[0028] In this embodiment, a first bearing 61 is provided between the fixed base 1 and the linkage cylinder 3 to reduce friction when the linkage cylinder 3 rotates in the first mounting hole 11 of the fixed base 1, thus ensuring rotational accuracy. The outer ring of the first bearing 61 abuts against the inner wall of the first mounting hole 11, and the inner ring of the first bearing 61 abuts against the outer wall of the linkage cylinder 3. A cover 12 is provided at the outer end of the first mounting hole 11, which abuts against the first bearing 61, serving to limit and protect the bearing axially, facilitating a stable and reliable rotational connection between the linkage cylinder 3 and the fixed base 1.

[0029] In this embodiment, the linkage cylinder 3 is equipped with two bearings within the cylinder body 21 to ensure rotational stability. A second bearing 62 is positioned between the protrusion 31 and the piston 22, with one side of the second bearing 62 abutting against the protrusion 31 and the other side against the piston 22. This allows the linkage cylinder 3 to rotate smoothly relative to the mold-locking cylinder 2, while simultaneously allowing the piston 22 to apply axial thrust to the linkage cylinder 3 without hindering its rotation. A third bearing 63 is positioned at the end of the linkage cylinder 3 near the drive motor 5. The outer ring of the third bearing 63 abuts against the inner wall of the cylinder body 21, and the inner ring abuts against the outer wall of the linkage cylinder 3, providing radial support to the motor-side of the linkage cylinder 3. The cooperation of the first bearing 61, the second bearing 62, and the third bearing 63 effectively improves the concentricity and stability of the linkage cylinder 3's rotation within the cylinder body 21, reducing radial runout during operation.

[0030] In this embodiment, a fourth bearing 64 is provided between the protrusion 31 and the fixed seat 1. One side of the fourth bearing 64 abuts against the protrusion 31, and the other side abuts against the fixed seat 1. The main function of the fourth bearing 64 is to bear the axial load on the linkage cylinder 3 in the mold-locked state, prevent the protrusion 31 from moving significantly in the axial direction towards the fixed seat 1, and ensure that the linkage cylinder 3 can rotate smoothly relative to the fixed seat 1, thereby avoiding friction between the protrusion 31 and the end face of the fixed seat 1 and protecting the components from wear.

[0031] Furthermore, in this embodiment, a return spring 7 is provided between the fixed base 1 and the fourth bearing 64. For example... Figure 3 As shown, the two ends of the return spring 7 directly or indirectly abut against the end face of the fixed seat 1 and the end face of the fourth bearing 64, respectively. When the mold locking cylinder 2 is filled with oil to lock the mold, the return spring 7 is compressed; after the mold is released and the hydraulic oil is released, the return spring 7 extends, driving the linkage cylinder 3 and the piston 22 to return to the initial state axially, thereby ensuring the reliability and consistency of each mold opening action.

[0032] Furthermore, in this embodiment, a splined shaft 52 is coaxially arranged between the output shaft 51 and the linkage cylinder 3. One end of the splined shaft 52 is connected to the output shaft 51 of the drive motor 5 via a spline fit, and the other end of the splined shaft 52 is connected to the linkage cylinder 3. Since the spline fit allows for a certain degree of relative sliding in the axial direction, when the mold-locking cylinder 2 drives the linkage cylinder 3 to produce a small displacement in the axial direction, the linkage cylinder 3 and the splined shaft 52 can slide on the output shaft 51 without disengaging from the output shaft 51 of the drive motor 5, ensuring that the drive motor 5 can effectively drive the linkage cylinder 3 to rotate throughout the entire mold-locking operation.

[0033] In this embodiment, the drive motor 5 is a hollow shaft motor, and its output shaft 51 has a hollow structure, which facilitates the installation of an adjusting wheel 53 at the other end of the output shaft 51 away from the linkage cylinder 3. The adjusting wheel 53 is exposed on the outside of the drive motor 5, and the operator can manually rotate the adjusting wheel 53 to drive the linkage cylinder 3 to rotate through the output shaft 51, thereby manually fine-tuning the initial extension position of the lead screw 4, which facilitates the centering and calibration operation of the moving template during equipment installation or maintenance.

[0034] In other embodiments, depending on the actual transmission and overall size design requirements, transmission methods such as keyway transmission and coupling transmission, as well as drive devices such as conventional servo motors, can be selected to drive the linkage cylinder 3 to operate in the manner described above.

[0035] Furthermore, in this embodiment, a die-casting machine is also disclosed, which includes the aforementioned die-casting machine locking mechanism and a moving template, the moving template being slidably mounted on the frame. The end of the lead screw 4 furthest from the drive motor 5 is connected to the moving template via a slider, which is rotatably mounted at the end of the lead screw 4 to release the relative rotational freedom between the end of the lead screw 4 and the moving template, preventing torsional stress from occurring when the linkage cylinder 3 rotates due to the rigid connection between the lead screw 4 and the moving template. When the lead screw 4 retracts, it also drives the moving template back to its initial position. A slide rail parallel to the direction of movement of the moving template is provided on the frame, and the slider is slidably mounted in the slide rail, guiding and supporting the movement of the moving template, effectively improving the stability and repeatability of the mold opening and closing action.

[0036] Based on the existing die-casting machine clamping mechanism, this utility model combines the advantages of precise motor position control and hydraulic cylinder large thrust output by using drive motor 5 and clamping cylinder 2 together. This achieves high-precision coordinated control of clamping position and clamping force, without the need for additional force amplification mechanism. It features simple structure, high strength, and stable operation, and has broad industrial application prospects.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A die casting machine locking mechanism characterized by, include: A mounting base having a first mounting hole; A mold-locking cylinder includes a cylinder body and a piston. The cylinder body is fixedly installed, and the cylinder body and the piston are provided with a second mounting hole coaxial with the first mounting hole. The linkage cylinder is rotatably disposed in the first mounting hole and the second mounting hole, with an internal thread on the inner wall and a protrusion on the outer wall that is connected to the piston. A lead screw is threaded into the linkage cylinder, and the extension direction of the lead screw is the same as the extension direction of the piston. The drive motor has its output shaft coaxially arranged with the linkage cylinder, and one end of the output shaft is connected to the linkage cylinder.

2. The die-casting machine clamping mechanism as described in claim 1, characterized in that, A first bearing is provided between the fixed base and the linkage cylinder, and a cover is provided on the outer end of the first mounting hole to abut against the first bearing.

3. The die-casting machine clamping mechanism as described in claim 1, characterized in that, A second bearing is provided between the protrusion and the piston, and a third bearing is provided at the end of the linkage cylinder near the drive motor. The outer ring of the third bearing abuts against the inner wall of the cylinder body, and the inner ring abuts against the outer wall of the linkage cylinder.

4. The die-casting machine clamping mechanism as described in claim 3, characterized in that, A fourth bearing is provided between the protrusion and the fixed base.

5. The die-casting machine clamping mechanism as described in claim 4, characterized in that, A return spring is provided between the fixed base and the fourth bearing.

6. A die-casting machine, characterized in that, include: The movable template is slidably mounted on the frame. The die-casting machine locking mechanism as described in any one of claims 1 to 5, wherein the end of the lead screw away from the drive motor is connected to the moving template.

7. The die-casting machine as described in claim 6, characterized in that, A slider is provided between the lead screw and the moving template. The slider is rotatably located at the end of the lead screw, and a slide rail is provided on the frame for the slider to slide.

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