Electric mold opening and closing system for two-platen injection molding machine

Abstract

The present invention discloses an electric mold opening and closing system of a two-platen injection molding machine, which comprises a machine body, a fixed mold plate, a movable mold plate, and a mold opening and closing driving device, wherein the mold opening and closing driving device comprises a mold shifting mechanism for driving the movable mold plate to move back and forth in a horizontal direction relative to the fixed mold plate, a brake mechanism for driving the movable mold plate to lock a brake nut, a brake auxiliary mechanism having a first state and a second state, and a mold locking mechanism for relatively locking the movable mold plate. The present invention utilizes the brake auxiliary mechanism to link the mold shifting mechanism with the brake mechanism, so that the mold shifting and mold locking are quickly connected. Not only is the process simple and rapid, but it can also effectively improve the positioning accuracy of the mold and the mold opening and closing repetition accuracy. In addition, the idle cycle of the injection molding machine itself is also shortened.

Description

Technical Field

[0001] The invention belongs to the field of mold opening and closing equipment, and in particular relates to an electric mold opening and closing system of a two-platen injection molding machine. Background Art

[0002] At present, hydraulic transmission is generally used in the mold closing process of two-platen injection molding machines, in which the mold closing process includes mold shifting process and mold locking process (also called brake). Specifically, the mold shifting uses a mold shifting cylinder to push the template to move. Through position control, the mold shifting cylinder stops after reaching the brake position. The brake cylinder drives the gate plate to engage and fix it on the tie rod thread of the high-pressure cylinder, and then the mold is locked by the high-pressure cylinder.

[0003] Obviously, the above-mentioned mold closing process has the following defects:

[0004] 1) The accuracy of the mold shifting cylinder is limited, which also reduces the mold positioning accuracy and the repeatability of mold opening and closing;

[0005] 2) During the mold closing process, the opening and closing of the mold shifting cylinder and the gate are separated and implemented independently, which also increases the dry cycle (dry cycle) of the injection molding machine itself. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved electric mold opening and closing system for a two-platen injection molding machine.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] An electric mold opening and closing system of a two-platen injection molding machine comprises a machine body, a fixed mold plate, a movable mold plate, and a mold opening and closing driving device, wherein the mold opening and closing driving device comprises a mold shifting mechanism for driving the movable mold plate to move back and forth horizontally relative to the fixed mold plate, a brake mechanism for driving the movable mold plate to lock the brake nut, and a clamping mechanism for relatively locking the movable mold plate, in particular,

[0009] The mold clamping drive device also includes a brake auxiliary mechanism having a first state and a second state.

[0010] When the mold is opened and closed, under the drive of the mold shifting mechanism, the brake auxiliary mechanism and the mold shifting mechanism assist the movable mold plate to move forward and backward in the horizontal direction. At this time, the brake auxiliary mechanism separates the mold shifting mechanism and the mold locking mechanism, and the brake auxiliary mechanism is in the first state;

[0011] When the brake is engaged, a linkage is formed between the brake mechanism and the mold shifting mechanism, the brake auxiliary mechanism is in the second state, and the mold locking mechanism locks the movable mold plate.

[0012] Preferably, a brake module that rotates around the moving direction of the movable template is formed on the movable template, and the clamping mechanism includes a clamping rod that crosses the movable template and the brake module, and a clamping power device that drives the clamping rod to drive the movable template to move horizontally. When opening and closing the mold, the brake module moves linearly relative to the clamping rod; when the brake is engaged, the brake module and the clamping rod are relatively fixed.

[0013] According to a specific implementation and preferred aspect of the present invention, a first matching portion and a second matching portion are formed on the outer periphery of the mold clamping rod and the inner wall of the brake module, respectively. When the mold is closed, the first matching portion and the second matching portion are staggered, and the brake module moves linearly relative to the mold clamping rod; when the brake is engaged, the first matching portion and the second matching portion are engaged, and the brake module and the mold clamping rod are relatively fixed. The advantage of this arrangement is that before the brake is engaged, the moving module can move normally to the set position, and when the brake is engaged, the entire brake process is simple and quick.

[0014] Specifically, the first matching part is a matching groove that is recessed inward from the outer circumference of the mold clamping rod; the second matching part is a matching protrusion formed on the inner wall of the brake module, wherein when the mold is closed, the matching protrusion moves in the matching groove; when the brake is engaged, the matching protrusion is relatively engaged with the matching groove. The matching groove includes an extension groove extending along the length direction of the mold clamping rod, and a bite groove located on the outer circumference of the mold clamping rod and connected to the extension groove. When the brake is engaged, the matching protrusion is relatively engaged with the bite groove.

[0015] According to another specific implementation and preferred aspect of the present invention, there are four groups of brake modules, which are arranged in a square shape on the movable mold plate, and the clamping mechanisms are arranged in a one-to-one correspondence with the brake modules.

[0016] Specifically, each brake module includes a brake carrier rotatably connected to the movable template, and a transmission gear arranged on the outer periphery of the brake carrier, wherein the two brake modules located on the same side are synchronously connected to the corresponding two transmission gears through a rack; there are two brake auxiliary mechanisms, and they are arranged on the two brake modules where the diagonals of the square are located, wherein each brake auxiliary mechanism includes a clutch component arranged on the outer periphery of the brake carrier, and the clutch component has a first mode and a second mode, and when in the first mode, the mold shifting mechanism and the brake module are transmission connected; when in the second mode, the mold shifting mechanism and the brake module are relatively disengaged.

[0017] According to another specific implementation and preferred aspect of the present invention, a brake gear is further provided on the outer periphery of the brake carrier, the mold shifting mechanism and the clutch component are arranged one by one, and the mold shifting mechanism includes a screw extending along the length direction of the mold locking rod, a nut matched with the screw, and a driving member driving the nut to rotate, wherein a connecting ear is fixedly provided on the opposite side of the movable mold plate, the screw passes through the connecting ear, and the nut is connected to the connecting ear through an external member. The advantage of such an arrangement is that the transmission is more stable and reliable by utilizing the cooperation of the screw and the gear.

[0018] Specifically, the driving member includes a first gear arranged on the outer periphery of the nut, a motor arranged on the connecting ear, and a second gear that transmission connects the motor output shaft to the first gear. When the mold is closed, the first gear and the brake gear are staggered; when the brake is engaged, the brake gear engages or disengages with the first gear as the clutch component moves.

[0019] In addition, the fuselage includes a base frame; a tail frame arranged at the end of the base frame away from the fixed template; a connecting rod fixed to the clamping rod at one end and fixed to the tail frame at the other end; and a slide rail arranged on the base frame and extending along the length direction of the clamping rod, wherein the connecting rod and the clamping rod are arranged in a one-to-one correspondence, the movable template and the tail frame are slidably arranged on the slide rail from the bottom, and the screw rod is connected to the tail frame from one end or the screw rod is connected to the clamping rod.

[0020] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] The present invention utilizes a brake auxiliary mechanism to link the mold shifting mechanism with the brake mechanism, so that mold shifting and mold locking are quickly connected. Not only is the process simple and rapid, but it can also effectively improve the positioning accuracy of the mold and the repeatability of mold opening and closing. In addition, it also shortens the idle cycle (dry cycle) of the injection molding machine itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the electric mold opening and closing system of the two-platen injection molding machine of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the right side.

[0024] Figure 3 for Figure 1 Schematic diagram of the middle brake module.

[0025] Among them: 1. fuselage; 10. chassis; 11. tail frame; 12. connecting rod; 13. slide rail;

[0026] 2. Set the template;

[0027] 3. Moving template; e. Connecting ear;

[0028] 4. Mold closing drive device; 40. Mold shifting mechanism; 400. Screw rod; 401. Nut; d. First gear; 402. Driving member; m. Motor; s. Motor output shaft; f. Second gear; 41. Mold locking mechanism; 410. Mold locking rod; b. Extension groove; c. Engagement groove; 411. Mold locking cylinder; 42. Brake auxiliary mechanism; h. Clutch; 43. Brake module; 430. Brake carrier; 431. Transmission gear; 432. Rack; 433. Brake gear; a. Protrusion. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] like Figure 1 As shown, the electric mold opening and closing system of the two-platen injection molding machine of this embodiment includes a machine body 1, a fixed mold plate 2, a movable mold plate 3, and a mold closing drive device 4.

[0036] Specifically, the fuselage 1 includes a base frame 10, a tail frame 11 arranged at the right end of the base frame 10, four connecting rods 12 whose right ends are fixed to the tail frame 11 and extend horizontally, and a slide rail 13 arranged on the base frame 10 and extending along the length of the connecting rod 12.

[0037] The fixed template 2 is fixedly arranged on the left end of the base frame 10 away from the tail frame 11 from the bottom.

[0038] The movable template 3 is slidably arranged on the slide rail 13 from the bottom, and connecting ears e are fixedly arranged on the opposite sides of the movable template 3.

[0039] The tailstock 11 is slidably disposed on the slide rail 13 from the bottom.

[0040] Combination Figure 2 As shown, the mold clamping drive device 4 includes a mold shifting mechanism 40 for driving the movable mold plate 3 to move horizontally relative to the fixed mold plate 2, a mold locking mechanism 41 for driving the movable mold plate 3 to engage in brake locking relative to the fixed mold plate 2, a brake auxiliary mechanism 42, and a brake module 43 formed on the movable mold plate 3 and rotating around the moving direction of the movable mold plate 3. There are four sets of brake modules 43, which are arranged on the movable mold plate 3 in a square shape.

[0041] Combination Figure 3As shown, each brake module 43 includes a brake carrier 430 rotatably connected to the movable template 3, a transmission gear 431 and a brake gear 433 arranged on the outer periphery of the brake carrier 430, wherein the brake carrier 430 is in the shape of a hollow column, and two groups of opposite protrusions a are provided on the inner wall, and each group of protrusions a is distributed in an array along the axial direction of the brake carrier 430.

[0042] In order to achieve synchronous movement of the upper and lower brake modules 43, the rack 432 is used to synchronously drive the upper and lower transmission gears 431 located on the same side.

[0043] The mold locking mechanism 41 includes a mold locking rod 410 that crosses the movable mold plate 3 and the brake carrier 430 , and a mold locking cylinder 411 that drives the mold locking rod 410 to move the movable mold plate 3 laterally.

[0044] In this example, there are also four groups of mold locking mechanisms 41 , which correspond one to one with the four groups of brake modules 43 .

[0045] The clamping rod 410 passes through the brake carrier 430 and is fixedly connected to the left end of the corresponding connecting rod 12 .

[0046] Specifically, each mold locking rod 410 is provided with an extension groove b extending along the length direction of the mold locking rod 410 , and an engagement groove c located at the outer periphery of the mold locking rod 410 and communicating with the extension groove b.

[0047] In this example, the extension groove b is located on the opposite sides of the mold locking rod 410. Therefore, the part of the mold locking rod 410 that passes through the brake carrier 430 is flat, and the bite groove c is located on the opposite sides of the flat. When the mold is closed, the protrusion a moves in the extension groove b, and the brake module 43 moves linearly relative to the mold locking rod 410; when the brake is engaged, the protrusion a rotates 90° and engages with the bite groove c, and the brake module 43 is relatively fixed to the mold locking rod 410. The advantage of this setting is that before the brake is engaged, the moving module can move normally to the set position, and when the brake is engaged, the entire brake process is simple and fast.

[0048] In this example, the protrusion a is in the shape of a thread, and the engaging groove c cooperates therewith.

[0049] In this example, there are two groups of mold shifting mechanisms 40, which are respectively arranged on one side of the two brake mold groups 43 where the diagonal lines of the square are located.

[0050] Specifically, each mold shifting mechanism 40 includes a screw rod 400 extending along the length direction of the mold locking rod 410 and passing through the connecting ear e, a nut 401 that cooperates with the screw rod 400 and is connected to the connecting ear e, and a driving member 402 that drives the nut 401 to rotate, wherein the nut 401 is connected to the connecting ear e through an external member. The advantage of this arrangement is that the transmission is more stable and reliable by utilizing the cooperation of the screw rod and the gear. In this example, the screw rod 400 is connected to the tail frame 11 from the right end; the driving member 402 includes a first gear d arranged on the outer periphery of the nut 401, a motor m arranged on the connecting ear e, and a second gear f that drives the motor output shaft s to connect with the first gear d.

[0051] In this example, there are two brake auxiliary mechanisms 42 , which are arranged on two brake modules 43 where the diagonals of the square are located, wherein each brake auxiliary mechanism 42 includes a clutch h arranged on the periphery of a brake carrier 430 .

[0052] In particular, the clutch h is arranged in one-to-one correspondence with the mold shifting mechanism 40, and has a first mode and a second mode. When the clutch h is in the first mode, the brake gear 433 and the first gear d are in transmission connection; when in the second mode, the brake gear 433 and the first gear d are relatively disengaged. In this example, although the specific structure of the clutch h is not expanded, the main reason is that the clutch is an external component, and it is also easy to implement the clutch state corresponding to the driving brake gear 433 and the first gear d to engage and disengage, so it is not described in detail here.

[0053] In summary, the implementation process of this implementation is as follows:

[0054] When closing the mold, the motor drives the nut on the lead screw through gear meshing, so that the nut moves along the length of the lead screw, and then pushes the connecting ear fixed on the moving die plate to move forward, so that the moving die plate moves closer to the fixed die plate until it moves to the set position to complete the mold closing;

[0055] When the brake is engaged, the clutch is activated, the brake gear on the brake carrier meshes with the first gear on the nut, and the brake gear rotates 90°, so that the protrusion on the inner wall of the brake carrier engages with the engagement groove on the clamping rod, the clamping cylinder is activated to achieve locking, and the clutch is activated again, so that the brake gear is disengaged from the first gear, completing the braking process.

[0056] When the mold is opened, the locking cylinder stops the tightening action, the motor rotates in the opposite direction, and then the clutch works to make the brake gear mesh with the first gear again. The brake gear rotates 90° in the opposite direction. When the protrusion and the engagement groove are offset, the brake gear is offset from the first gear through the clutch, and the nut drives the moving module back along the length direction of the screw.

[0057] Therefore, this embodiment has the following advantages:

[0058] This embodiment utilizes the brake auxiliary mechanism to link the mold shifting mechanism with the brake mechanism, so that the mold shifting and mold locking can be quickly connected. Not only is the process simple and quick, but it can also effectively improve the positioning accuracy of the mold and the repeatability of mold opening and closing. In addition, it also shortens the idle cycle (dry cycle) of the injection molding machine itself.

[0059] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric mold opening and closing system of a two-platen injection molding machine, comprising a machine body, a fixed platen, a movable platen, and a mold opening and closing driving device, wherein the mold opening and closing driving device comprises a mold shifting mechanism for driving the movable platen to move back and forth in a horizontal direction relative to the fixed platen, a brake mechanism for driving the movable platen brake nut to lock, and a clamping mechanism for relatively locking the movable platen, characterized in that: The mold clamping drive device also includes a brake auxiliary mechanism having a first state and a second state. When the mold is opened and closed, under the drive of the mold shifting mechanism, the brake auxiliary mechanism and the mold shifting mechanism assist the movable mold plate to move forward and backward in the horizontal direction. At this time, the brake auxiliary mechanism separates the mold shifting mechanism and the mold locking mechanism, and the brake auxiliary mechanism is in the first state; When the brake is engaged, a linkage is formed between the brake mechanism and the mold shifting mechanism, the brake auxiliary mechanism is in the second state, and the mold locking mechanism locks the movable mold plate; A holding brake module rotating around the moving direction of the moving plate is formed on the moving plate, and the clamping mechanism includes a clamping rod crossing the moving plate and the holding brake module, and a clamping power device driving the clamping rod to drive the moving plate to move horizontally; A first matching portion and a second matching portion are formed on the outer periphery of the mold locking rod and the inner wall of the brake module, respectively. The first matching portion is a matching groove that is recessed inward from the outer periphery of the mold locking rod; the second matching portion is a matching protrusion formed on the inner wall of the brake module. When the mold is closed, the first matching portion and the second matching portion are staggered, the brake module moves linearly relative to the mold locking rod, and the matching protrusion moves in the matching groove; when the brake is engaged, the matching protrusion is relatively engaged with the matching groove, and the brake module and the mold locking rod are relatively fixed; Each brake module includes a brake carrier rotatably connected to the movable platen and a transmission gear arranged on the outer periphery of the brake carrier, wherein two brake modules located on the same side are synchronously connected to two corresponding transmission gears through racks; the brake carrier is in the shape of a hollow column, and two groups of opposite protrusions are arranged on the inner wall, and each group of protrusions is distributed in an array along the axial direction of the brake carrier, and the protrusions are in the shape of a thread; The brake auxiliary mechanism includes a clutch component arranged on the outer periphery of the brake carrier, and a brake gear is also arranged on the outer periphery of the brake carrier. The mold shifting mechanism and the clutch component are arranged in a one-to-one correspondence, and the mold shifting mechanism includes a lead screw extending along the length direction of the locking rod, a nut matched with the lead screw, and a driving member driving the nut to rotate, wherein a connecting ear is fixedly arranged on the opposite side of the movable template, and the driving member includes a first gear arranged on the outer periphery of the nut, a motor arranged on the connecting ear, and a second gear that transmission-connects the motor output shaft to the first gear. When opening and closing the mold, the first gear and the brake gear are staggered; when the brake is engaged, the brake gear engages or disengages with the first gear as the clutch component moves.

2. The electric mold opening and closing system of the two-platen injection molding machine according to claim 1 is characterized in that: The matching groove is an extension groove extending along the length direction of the locking rod, and the biting groove is located at the outer periphery of the locking rod and connected to the extension groove. When the brake is engaged, the matching protrusion is relatively bitten with the biting groove.

3. The electric mold opening and closing system of the two-platen injection molding machine according to claim 1 is characterized in that: There are four groups of the brake modules, which are arranged in a square shape on the movable template, and the locking mechanism is arranged in a one-to-one correspondence with the brake modules.

4. The electric mold opening and closing system of the two-platen injection molding machine according to claim 3 is characterized in that: There are two brake auxiliary mechanisms, which are arranged on the two brake modules where the diagonals of the square are located. The clutch component has a first mode and a second mode. When in the first mode, the mold shifting mechanism and the brake module are transmission connected; when in the second mode, the mold shifting mechanism and the brake module are relatively separated.

5. The electric mold opening and closing system of the two-platen injection molding machine according to claim 1 is characterized in that: The screw rod passes through the connecting ear, and the nut is connected to the connecting ear through an external connecting piece.

6. The electric mold opening and closing system of the two-platen injection molding machine according to claim 1, characterized in that: The fuselage includes a base frame; a tail frame arranged on the base frame away from the end of the fixed template; a connecting rod fixed to the locking rod at one end and fixed to the tail frame at the other end; and a slide rail arranged on the base frame and extending along the length direction of the locking rod, wherein the connecting rod is arranged in a one-to-one correspondence with the locking rod, the movable template and the tail frame are slidably arranged on the slide rail from the bottom, and the screw rod is connected to the tail frame from one end or the screw rod is connected to the locking rod.

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