Two-platen injection molding machine with electric mold opening and closing

Abstract

The present invention relates to a two-platen injection molding machine with electric mold opening and closing, which includes a machine base, a fixed mold plate, a movable mold plate and a mold opening and closing device, wherein the mold opening and closing device includes a mold locking mechanism, a mold shifting mechanism, and a mold closing mechanism. On the one hand, the present invention applies a force to the mold through a middle mold locking high-pressure oil cylinder and a plurality of mold locking tie rods, so that the mold is closed under relatively uniform stress, thereby improving the mold closing accuracy; on the other hand, the mold shifting and mold locking can be performed synchronously without pausing, which is not only simple and fast, but also can effectively improve the positioning accuracy of the mold and the repeatability of mold opening and closing. In addition, the mold locking tie rod does not need to have a reset action to implement the mold opening and closing, so the action is continuous, and the empty cycle (dry 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 a two-platen injection molding machine with electric mold opening and closing. 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;

[0006] 3) The clamping rods on the market are four oil cylinder core shafts, and the cylinder body is locked on the clamping head plate. In this way, from the process point of view, the clamping rod needs to have a reset action, which is not convenient for opening and closing the mold. At the same time, the mold is subjected to the force of the four-point tie rod, which cannot ensure uniform force. Therefore, it has a certain impact on the clamping accuracy;

[0007] 4) In the process of mold shifting, most of the time two fast cylinders are used. In this way, the mold shifting speed and accuracy are also difficult to control. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved two-platen injection molding machine with electric mold opening and closing.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0010] A two-platen injection molding machine with electric mold opening and closing, comprising:

[0011] Machine base;

[0012] A fixed plate, which is fixed to one end of the machine base;

[0013] A movable platen, which is slidably disposed on a machine base relative to a fixed platen;

[0014] The mold opening and closing device includes a mold locking mechanism, a mold shifting mechanism, and a mold closing mechanism.

[0015] In particular, the clamping mechanism includes a plurality of clamping rods fixed on the fixed platen and extending along the moving direction of the movable platen, a clamping nut provided on the movable platen and capable of correspondingly cooperating with each clamping rod, and a clamping power device for driving the plurality of clamping nuts to move synchronously and relatively lock or relatively separate with the corresponding clamping rods;

[0016] The mold shifting mechanism is connected to the mold locking power device through a clutch. When the mold is shifted, the clutch is in a disengaged state, and the mold locking rod can be movably inserted in the mold locking nut; when the mold is locked, the clutch is in an engaged state, the mold locking power device and the mold shifting mechanism move synchronously, and the mold locking rod rotates and locks relative to the mold locking nut.

[0017] The mold clamping mechanism is located on the movable mold plate and between the movable mold plate and the fixed mold plate, and includes a power output part and a mold clamping power device, wherein the direction of the mold clamping force provided by the mold clamping power device is the same as the direction of the pulling force provided by the locking tie rod corresponding to the movable mold plate and is arranged in parallel in the area surrounded by multiple locking tie rods.

[0018] Preferably, the mold locking power device includes a transmission wheel coaxially connected to each mold locking nut, a synchronous wheel connected to the clutch, and a synchronous transmission member that drives and connects multiple transmission wheels to the synchronous wheels, wherein when the synchronous wheel is idling relative to the mold shifting mechanism, the clutch is in a disengaged state; when the synchronous wheel and the mold shifting mechanism move synchronously, the clutch is in an engaged state. In this way, through the setting of the clutch, mold shifting and mold locking can be carried out synchronously without pausing, and share a power source. At the same time, through the rapid connection of mold shifting and mold locking, not only the process is simple and fast, but also the positioning accuracy of the mold and the repeatability of mold opening and closing can be effectively improved. In addition, the idle cycle (dry cycle) of the injection molding machine itself is also shortened.

[0019] Specifically, each transmission wheel is connected to a corresponding locking nut and is positioned on the movable platen through a connecting sleeve; the synchronous transmission member is a synchronous belt, a connecting rod transmission member or a gear transmission member.

[0020] In this example, the transmission wheel and the synchronous wheel are gears, and the rack belt of the synchronous belt can keep the displacement of the moving plate consistent.

[0021] Of course, considering the tightness of the synchronous belt, a tensioning guide wheel can be provided on the moving platen, so as to realize the synchronous transmission of multiple transmission wheels more stably.

[0022] In this example, the number of teeth and diameter of the transmission wheel and the synchronous wheel are the same, which is convenient for assembly and the control of the displacement to be consistent.

[0023] According to a specific implementation and preferred aspect of the present invention, a partitioned internal thread bite section is formed on the inner wall of each mold locking nut, and a partitioned external thread bite section is formed on the corresponding mold locking tie rod, wherein when the mold locking nut and the mold locking tie rod are locked, the internal thread bite section and the external thread bite section are relatively engaged; when the mold locking nut and the mold locking tie rod are unlocked, the internal thread bite section and the external thread bite section are relatively staggered. Such engagement and staggering can ensure the stability of mold locking and mold opening and closing.

[0024] Preferably, the internal thread bite section has two sections and is correspondingly arranged on opposite sides of the inner wall of the locking nut; the external thread bite section is correspondingly arranged on opposite sides of the locking rod, wherein after the locking nut is rotated 90° forward or reverse, the internal thread bite section and the external thread bite section switch between a relatively staggered state and a relatively engaged state. The operation is convenient.

[0025] According to a specific implementation and preferred aspect of the present invention, the power output member is a mold mounting plate arranged on the movable mold plate, and the mold closing power device is a locking high-pressure cylinder whose two ends are respectively connected between the mold mounting plate and the movable mold plate, wherein the center of the locking high-pressure cylinder is arranged to coincide with the center of the area surrounded by multiple locking tie rods.

[0026] In this example, there are four clamping rods distributed in a rectangular shape, and the center of the clamping high-pressure oil cylinder is set to coincide with the center of the rectangle; a corresponding slot or avoidance hole is formed on the mold mounting plate to avoid the clamping rods. The setting of the clamping high-pressure oil cylinder, combined with the stress of the clamping rods, ensures uniform force on the mold after mold closing, thereby ensuring the accuracy of mold closing.

[0027] Alternatively, a mold mounting plate and a mold connecting sleeve whose two ends are respectively connected between the mold mounting plate and the movable mold plate are formed on the movable mold plate, wherein the mold connecting sleeve is hollow and annular inside, and a plurality of slide grooves extending along the length direction of the clamping rod are formed on the mold connecting sleeve, and the mold clamping power device includes a slide seat respectively matched with each slide groove and slidably arranged on the mold connecting sleeve along the length direction of the slide groove, a pin rod arranged on the slide seat and capable of passing through the mold mounting plate, and a power cylinder for driving the slide seat to move between the mold mounting plate and the movable mold plate, and the pin rod tightens or loosens the mold from the end passing through the mold mounting plate as the power cylinder moves.

[0028] According to a specific implementation and preferred aspect of the present invention, the mold shifting mechanism includes a fixed seat arranged on the fixed mold plate or the machine base, a screw rod matched with the fixed seat and arranged in parallel with the mold locking rod, and a mold shifting power device for driving the screw rod to rotate around its own axis and positioned on the movable mold plate. The drive mode of the screw rod is adopted to further improve the stability and accuracy of the mold shifting and mold locking. At the same time, it should be noted that in this example, the displacement of the mold locking nut is the same as the displacement of the movable mold plate, that is to say: 1. The pitch of the mold locking nut is the same as the lead of the screw rod; 2. The number of teeth of the transmission wheel and the synchronous wheel is the same. Of course, these two points can also be different as long as the displacement is kept consistent.

[0029] Preferably, the screw is a ball screw, and the mold shifting power device includes a driving motor whose axis coincides with the axis of the ball screw, a coupling for connecting the output shaft of the driving motor with the end of the ball screw away from the fixed seat, and the clutch is arranged on the coupling or the output shaft.

[0030] Alternatively, the screw rod is a ball screw rod, and there are two of them, wherein the two ball screw rods are correspondingly arranged on opposite sides of the fixed mold plate and distributed diagonally up and down; the mold shifting power device includes a driving motor whose axis is arranged parallel to the ball screw rod, and a transmission component for connecting the output shaft of the driving motor with the end of the ball screw rod away from the fixed seat, and the clutch is arranged on the output shaft. The transmission component includes an output wheel arranged on the output shaft, a transmission wheel arranged at the end of the screw rod away from the fixed seat, and a synchronous connecting member that synchronously connects the output wheel and the transmission wheel, wherein the synchronous connecting member is a conveyor belt, a connecting rod transmission member or a gear transmission member.

[0031] Furthermore, the transmission component also includes a tension wheel, and the transmission belt transmits and connects the transmission wheel, the output wheel, and the tension wheel.

[0032] Specifically, the output wheel, transmission wheel, and tensioning wheel are also gears, and the transmission belt is also a rack belt, wherein the output wheel is coaxially arranged with the synchronous wheel, and the output wheel is located on the outside of the synchronous wheel, so that the synchronous belt is located between the transmission belt and the moving template.

[0033] In addition, a slide rail is formed on the machine base, and the moving module is slidably arranged on the slide rail from the bottom.

[0034] In this example, there are two slide rails, which are arranged in parallel, wherein the cross section of each slide rail is I-shaped, and a slide groove matching the I-shape is formed at the bottom of the moving module.

[0035] Meanwhile, in this example, the clutch is a tooth-type clutch, which can be purchased directly from the market, and its principle is not described here, which is also clear and feasible.

[0036] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0037] On the one hand, the present invention applies a force to the mold through the mold clamping force and the clamping tension provided by multiple clamping tie rods, so that the mold is clamped under relatively uniform stress, thereby improving the clamping accuracy; on the other hand, mold shifting and clamping can be performed synchronously without pausing, which is not only simple and quick, but also can effectively improve the positioning accuracy of the mold and the repeatability of mold opening and closing. In addition, the clamping tie rod does not need to have a reset action to implement the opening and closing of the mold, so the action is continuous and the dry cycle (dry cycle) of the injection molding machine itself is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a two-platen injection molding machine in Example 1 of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of the main view;

[0040] Figure 3 for Figure 1 A right side schematic diagram of

[0041] Figure 4 for Figure 3 AA section view;

[0042] Figure 5 for Figure 1 A top view schematic diagram of

[0043] Figure 6 It is a structural schematic diagram of a two-platen injection molding machine in Example 2;

[0044] Figure 7 for Figure 6 A schematic diagram of the main view;

[0045] Figure 8 for Figure 6 Schematic diagram of the left side;

[0046] Fig. 9 for Figure 8 BB-direction cross-sectional view;

[0047] Fig.10 for Figure 6 A top view schematic diagram of

[0048] Fig.11 It is a structural schematic diagram of a two-platen injection molding machine in Example 3;

[0049] Fig.12 for Fig.11 A right side schematic diagram of

[0050] Fig.13 for Fig.12 Schematic diagram of CC section (partial);

[0051] Among them: 1, machine base; 1a, I-shaped slide rail; 2, fixed plate; 2a, perforation; 3, movable plate; 4, mold opening and closing device; 40, mold locking mechanism; 400, mold locking rod; b, external thread bite section; 401, mold locking nut; a, internal thread bite section; 402, mold locking power device; a1, transmission wheel; a2, synchronous wheel; a3, synchronous belt; t, connecting sleeve; a4, tensioning guide wheel; 41, mold shifting mechanism; 410, fixed seat; 411, screw rod; 412, mold shifting dynamic power device; b1, driving motor; b2, coupling; b3, transmission component; b30, output wheel; b31, transmission wheel; b32, tensioning wheel; b33, conveyor belt; 42, mold clamping mechanism; 420, power output member; q, missing groove; c1, mold mounting plate; c2, mold connecting sleeve; c20, slide groove; c21, arc-shaped part; 421, mold clamping power device; d1, slide seat; d2, ejector rod; d3, power cylinder; d4, connecting ear; 43, clutch; 5, slide seat. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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. Example 1

[0058] like Figure 1 As shown, the two-platen injection molding machine with electric mold opening and closing of this embodiment includes a machine base 1, a fixed mold plate 2, a movable mold plate 3, and a mold opening and closing device 4.

[0059] Specifically, the machine base 1 is in the shape of a rectangular platform, the fixed template 2 is fixed to the left end of the machine base 1, the movable template 3 is arranged on the machine base 1 for translation along the length direction of the rectangle, and the mold opening and closing device 4 is used to drive the movement of the movable template 3 to realize the opening and closing of the mold.

[0060] Combination Figure 2 As shown, I-shaped slide rails 1a are formed on opposite sides of the machine base 1, and the bottom of the movable template 3 is slidably set on the I-shaped slide rails 1a through a slide seat 5.

[0061] In this example, the mold opening and closing device 4 includes a mold locking mechanism 40, a mold shifting mechanism 41, and a mold closing mechanism 42, wherein the mold shifting mechanism is first, the mold locking mechanism is second, and the mold closing mechanism is last.

[0062] Combination Figure 3 As shown, the clamping mechanism 40 includes four clamping rods 400 fixed on the fixed mold plate 2 and extending along the moving direction of the movable mold plate 3, a clamping nut 401 arranged on the movable mold plate 3 and capable of one-to-one matching with each clamping rod 400, and a clamping power device 402 for driving multiple clamping nuts 401 to move synchronously and relatively lock or relatively separate with the corresponding clamping rods 400.

[0063] The mold shifting mechanism 41 is connected to the mold locking power device 402 through a clutch 43. When the mold is shifted, the clutch 43 is in a disengaged state, and the mold locking nut 401 can allow the corresponding mold locking rod 400 to pass through and be set; when the mold is locked, the clutch 43 is in an engaged state, the mold locking power device 402 and the mold shifting mechanism 41 move synchronously, and the mold locking rod 400 is relatively locked with the corresponding mold locking nut 401.

[0064] The mold clamping mechanism 42 is located on the movable mold plate 3 and between the movable mold plate 3 and the fixed mold plate 2, and includes a power output part 420 and a mold clamping power device 421, wherein the direction of the mold clamping force provided by the mold clamping power device 421 is the same as the direction of the pulling force provided by the locking tie rod 400 corresponding to the movable mold plate 3 and is arranged in parallel in the area surrounded by multiple locking tie rods 400.

[0065] In this example, the power output part 420 is a mold mounting plate arranged on the movable mold plate 3, and the mold closing power device 421 is a locking high-pressure cylinder whose two ends are respectively connected between the mold mounting plate and the movable mold plate 3, wherein the locking high-pressure cylinder is arranged parallel to the locking rod 400, and is correspondingly arranged in the middle of the area surrounded by the four locking rods 400.

[0066] Specifically, the four clamping rods 400 are arranged in a rectangular shape, and each clamping rod 400 is extended along the length direction of the rectangle, and the center of the clamping high-pressure oil cylinder coincides with the center of the rectangle; a notch q is formed on the mold mounting plate to avoid the clamping rod 400. The arrangement of the clamping high-pressure oil cylinder, combined with the stress of the clamping rod, ensures uniform force on the mold after mold closing, thereby ensuring the accuracy of mold closing.

[0067] In this example, the clamping high-pressure cylinder has a large diameter and a small stroke, which is mainly used to avoid the phenomenon of inadequate mold closing. Generally, its stroke is between 5 and 20 mm. Of course, it can be selected according to actual needs.

[0068] Therefore, one end of the clamping high-pressure oil cylinder is fixed on the movable platen 3, and the other end is fixed to the middle of the mold mounting plate.

[0069] At the same time, in order to facilitate the translational clamping of the mold mounting plate, a guide shoe is correspondingly formed at the bottom of the mold mounting plate, and a guide rail is correspondingly provided on the movable mold plate 3.

[0070] Combination Figure 4 As shown, in this example, the inner wall of each mold locking nut 401 is formed with spaced internal thread bite sections a, and the corresponding mold locking tie rod 400 is formed with external thread bite sections b, wherein when the mold locking nut 401 is locked with the mold locking tie rod 400, the internal thread bite sections a and the external thread bite sections b are relatively engaged; when the mold locking nut 401 is unlocked with the mold locking tie rod 400, the internal thread bite sections a and the external thread bite sections b are relatively staggered. Such engagement and staggering can ensure the stability of mold locking and mold opening and closing.

[0071] The internal thread bite section a has two sections and is correspondingly arranged on the opposite sides of the inner wall of the locking nut 401; the external thread bite section b is correspondingly arranged on the opposite sides of the locking rod 400, wherein after the locking nut 401 is rotated 90° forward or reverse, the internal thread bite section a and the external thread bite section b are switched between a relatively staggered state and a relatively engaged state. The operation is convenient.

[0072] Combination Figure 5 As shown, the mold locking power device 402 includes a transmission wheel a1 coaxially connected to each mold locking nut 401, a synchronous wheel a2 connected to the clutch 43, and a synchronous belt a3 that drives and connects multiple transmission wheels a1 and synchronous wheels a2, wherein when the synchronous wheel a2 is idling relative to the mold shifting mechanism 41, the clutch 43 is in a disengaged state; when the synchronous wheel a2 moves synchronously with the mold shifting mechanism 41, the clutch 43 is in an engaged state. In this way, through the setting of the clutch, mold shifting and mold locking can be carried out synchronously without pausing, and share a power source. At the same time, through the rapid connection between mold shifting and mold locking, not only the process is simple and fast, but also the positioning accuracy of the mold and the repeatability of mold opening and closing can be effectively improved. In addition, the idle cycle (dry cycle) of the injection molding machine itself is also shortened.

[0073] Specifically, each transmission wheel a1 is connected to the corresponding locking nut 401 and is positioned on the movable platen 3 through the connecting sleeve t. In this way, the transmission wheel a1 and the locking nut 401 are equivalent to the rotation of the connecting sleeve t, so that the screwing and separation can be implemented.

[0074] In this example, the transmission wheel a1 and the synchronous wheel a2 are both gears, and the synchronous belt a3 is a rack belt (of course, other mechanical connecting rods can also be used as the transmission mechanism). Such an implementation can keep the displacement of the moving plate consistent.

[0075] Of course, considering the tightness of the synchronous belt a3, a tensioning guide wheel a4 can be provided on the movable platen 3, so as to realize the synchronous transmission of multiple transmission wheels more stably.

[0076] At the same time, the number of teeth and diameter of the transmission wheel a1 and the synchronous wheel a2 are the same, which is convenient for assembly and the control of the displacement to be consistent.

[0077] In this example, the mold shifting mechanism 41 includes a fixed seat 410 disposed on the machine base 1, a screw 411 matched with the fixed seat 410 and disposed parallel to the mold clamping rod 400, and a mold shifting power device 412 for driving the screw 411 to rotate around its own axis and positioned on the movable mold plate 3. The use of the screw transmission method further improves the stability and accuracy of mold shifting and mold clamping. At the same time, it should be noted that in this example, the displacement of the mold clamping nut is the same as the displacement of the movable mold plate, that is to say: 1. The pitch of the mold clamping nut is the same as the lead of the screw; 2. The number of teeth of the transmission wheel and the synchronous wheel is the same. Of course, these two points can also be different as long as the displacement is kept consistent.

[0078] The mold shifting power device 412 includes a driving motor b1 whose axis is parallel to the screw rod 411, a coupling b2 for connecting the output shaft of the driving motor b1 with the end of the screw rod 411 away from the fixing seat 410, and a clutch 43 is arranged on the coupling b2.

[0079] In this example, the screw rod 411 is a ball screw and is arranged directly below the clamping high-pressure cylinder. A through hole 2a is correspondingly provided on the fixed mold plate 2 for the ball screw to pass through. At the same time, an avoidance hole is also formed on the mold mounting plate for the ball screw to pass through.

[0080] At the same time, the above-mentioned four transmission wheels a1 are correspondingly arranged at four diagonals of the movable template 3, the synchronous wheel a2 is located below the bottom two transmission wheels a1, and the tensioning guide wheels a4 are located on opposite sides of the synchronous wheel a2.

[0081] The clutch 43 is a tooth clutch, which can be purchased directly from the market. Its principle will not be described here, but it is clear and feasible.

[0082] Therefore, the above implementation process is divided into a mold closing process and a mold opening process.

[0083] Specifically, the mold closing process is as follows:

[0084] Step 1: The servo motor (i.e., the drive motor b1) drives the ball screw to rotate through the coupling b2, thereby driving the entire movable mold plate 3 to move along the linear rail (I-shaped slide rail 1a) toward the fixed mold plate 2 (at this time, the tooth clutch 43 is in a power-off state, i.e., a disengaged state);

[0085] Step 2: Before the mold is closed, the mold locking rod 400 and the mold locking nut 401 are in a position where they can be screwed together, the tooth clutch 43 is engaged, and the servo motor drives the moving plate 3 forward while the synchronous belt a3 is driven to rotate the four mold locking nuts 90°, and the mold locking nut 401 is screwed together to wrap around the mold locking rod 400 to complete the mold locking;

[0086] Step 3: The clamping high-pressure cylinder works to push the mold mounting plate, establish the clamping force, and complete the mold closing action.

[0087] The specific mold opening process is as follows:

[0088] Step 1: After waiting for the injection action to be completed, the clamping high-pressure oil cylinder drives the mold mounting plate to retreat and release the high pressure;

[0089] Step 2: The tooth clutch 43 is engaged, the servo motor is reversed, and the four locking nuts 401 are rotated 90° in the opposite direction through the transmission of the synchronous belt a3, and the locking nuts 401 and the locking rod 400 are unscrewed, and the clutch 43 is disengaged after completion;

[0090] Step 3: The servo motor reverses to drive the ball screw to rotate in the opposite direction, thereby driving the entire movable template 3 to move in the opposite direction of the fixed template 2 along the linear rail. After reaching the position, the mold opening action is completed. Example 2

[0091] like Figures 6 to 8 As shown, the two-platen injection molding machine with electric mold opening and closing of this embodiment includes a machine base 1, a fixed mold plate 2, a movable mold plate 3, and a mold opening and closing device 4.

[0092] Specifically, the machine base 1 , the fixed mold plate 2 , the movable mold plate 3 , and the mold opening and closing device 4 are similar to those in the first embodiment, and the difference lies in the mold shifting mechanism 41 .

[0093] Combination Figures 9 and 10 As shown, the mold shifting mechanism 41 includes a fixed seat 410 arranged on opposite sides of the fixed mold plate 2 and distributed diagonally up and down, a screw rod 411 matched with the fixed seat 410 and arranged parallel to the clamping rod 400, and a mold shifting power device 412 for driving the screw rod 411 to rotate around its own axis and positioned on the movable mold plate 3.

[0094] The mold shifting power device 412 includes a driving motor b1 whose axis is parallel to the screw rod 411, a transmission component b3 for connecting the output shaft of the driving motor b1 with the end of the screw rod 411 away from the fixed seat, and a clutch 43 is arranged on the output shaft.

[0095] The transmission component b3 includes an output wheel b30 arranged on the output shaft; a transmission wheel b31 arranged at the end of the screw rod 411 away from the fixed seat 410; a tensioning wheel b32; and a transmission belt b33 that transmission connects the output wheel b30, the transmission wheel b31 and the tensioning wheel b32 (of course, other mechanical connecting rods can also be used as the transmission mechanism).

[0096] Specifically, the output wheel b30, the transmission wheel b31, and the tensioning wheel b32 are also gears, and the conveyor belt b33 is also a rack belt, wherein the output wheel b30 is coaxially arranged with the synchronous wheel a2, and the output wheel b30 is located on the outside of the synchronous wheel a2, so that the synchronous belt a3 is located between the conveyor belt b33 and the moving template 3.

[0097] In this example, the conveyor belt b33 is distributed in a trapezoidal shape.

[0098] At the same time, since the driving motor b1 is located at the lower left side of the moving platen 3, the direction of the synchronous belt a3 is also different, but it will not affect the synchronization of the movement.

[0099] As for the implementation method, it is the same as the implementation of the embodiment, with a slight difference that during the mold shifting process, the two ball screws are driven by the conveyor belt b33, and the movement of the ball screws drives the movement of the movable mold plate 3. Example 3

[0100] like Fig.11 As shown, the two-platen injection molding machine with electric mold opening and closing of this embodiment includes a machine base 1, a fixed mold plate 2, a movable mold plate 3, and a mold opening and closing device 4.

[0101] Specifically, the machine base 1 , the fixed platen 2 , the movable platen 3 , and the mold opening and closing device 4 are similar to those in Embodiment 1, except for the mold closing mechanism 42 .

[0102] Combination Fig.12 As shown, the movable mold plate 3 is in an "X" shape, and four clamping tie rods 400 are correspondingly arranged at the ends of the "X" shape.

[0103] Combination Fig.13 As shown, in this example, the power output component 420 includes a mold mounting plate c1 arranged on the movable mold plate 3, and a mold connecting sleeve c2 whose two ends are respectively connected between the mold mounting plate c1 and the movable mold plate 3, wherein the mold connecting sleeve c2 is hollow and annular inside, and a plurality of slide grooves c20 extending along the length direction of the locking rod 400 are formed on the mold connecting sleeve c2.

[0104] The mold closing power device 421 includes a slide d1 which cooperates with each slide groove c20 and is slidably set on the mold connecting sleeve c2 along the length direction of the slide groove c20, a pin rod d2 which is set on the slide d1 and can pass through the mold mounting plate c1, and a power cylinder d3 for driving the slide d1 to move between the mold mounting plate c1 and the movable plate 3, wherein the pin rod d2 tightens or loosens the mold from the end that passes through the mold mounting plate c1 as the power cylinder d3 moves.

[0105] Furthermore, the mold connecting sleeve c2 is in a circular ring shape, and has four slide grooves c20, all extending along the length direction of the mold connecting sleeve c2 and evenly distributed around the circumference of the ring. In this way, an arc portion c21 is formed between each two adjacent slide grooves c20, and the end of the mold connecting sleeve c2 connected to the mold mounting plate c1 forms four arc portions c21.

[0106] In this example, in order to implement the ejector mold opening and closing, a through hole matching the arc portion c21 is provided on the slide d1. At the same time, there are five ejector rods d2, one of which is correspondingly arranged in the middle of the slide d1, and the center line of the ejector rod d2 coincides with the center line of the circular ring; the remaining four are distributed in a circular array around the center of the slide d1.

[0107] At the same time, in order to facilitate the setting of the power cylinder d3, connecting ears d4 are formed on the opposite sides of the slide d1. The power cylinder d3 is a hydraulic cylinder, wherein the telescopic end of each hydraulic cylinder passes through the connecting ear d4 and is fixedly connected to the corresponding side mold mounting plate c1. When the two hydraulic cylinders are synchronously extended and retracted, the slide d1 will be driven to slide back and forth along the length direction of the slide groove c20, thereby implementing the 5 ejector rods to contact or detach from the mold.

[0108] Then, it is precisely because of the setting of the "X"-shaped moving template 3 that the two hydraulic cylinders are correspondingly distributed in the left and right side gaps of the "X"-shaped moving template 3, making the structure compact and relatively beautiful.

[0109] As for the mold closing principle, it is exactly the same as in the embodiment, except that the final mold closing action mainly depends on the resistance or separation of the ejector pin to complete the corresponding mold opening and closing process.

[0110] Therefore, the two-platen injection molding machine using the above embodiment has the following advantages:

[0111] 1. The clamping force and the clamping tension provided by multiple clamping rods jointly exert force on the mold, so that the mold is clamped under relatively uniform stress, thereby improving the clamping accuracy;

[0112] 2. The use of servo motor, ball screw and tooth clutch optimizes the traditional mold opening and closing production cycle, ensuring the mold moving speed while improving the mold closing accuracy;

[0113] 3. It can ensure the screwing accuracy of the locking nut and the locking rod;

[0114] 4. The mold shifting and clamping can be performed simultaneously without pause. 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, the clamping rod does not need to be reset to open and close the mold, so the action is continuous and the dry cycle (dry cycle) of the injection molding machine itself is shortened.

[0115] 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. A two-platen injection molding machine with electric mold opening and closing, include: Machine base; A fixed plate, which is fixed to one end of the machine base; A movable platen is slidably disposed on a machine base relative to a fixed platen; The mold opening and closing device includes a mold locking mechanism, a mold shifting mechanism and a mold closing mechanism. The invention is characterized in that: a slide rail is formed on the machine base, and the movable module is slidably arranged on the slide rail from the bottom; the mold locking mechanism includes a plurality of mold locking rods fixed on the fixed mold plate and extending along the moving direction of the movable mold plate, a mold locking nut arranged on the movable mold plate and capable of one-to-one matching with each mold locking rod, and a mold locking power device for driving a plurality of mold locking nuts to move synchronously and relatively lock or relatively separate with the corresponding mold locking rods; the mold locking power device includes a transmission wheel coaxially connected to each mold locking nut, a synchronous wheel connected to the clutch, and a synchronous transmission member that transmission-connects a plurality of transmission wheels with the synchronous wheel, wherein when the synchronous wheel is idling relative to the mold shifting mechanism, the clutch is in a disengaged state; when the synchronous wheel moves synchronously with the mold shifting mechanism, the clutch is in an engaged state; The mold shifting mechanism is connected to the mold locking power device through a clutch. When the mold is shifted, the clutch is in a disengaged state, and the mold locking rod can be movably inserted in the mold locking nut; when the mold is locked, the clutch is in an engaged state, the mold locking power device and the mold shifting mechanism move synchronously, and the mold locking rod rotates and locks relative to the mold locking nut. The mold clamping mechanism is located on the movable mold plate and between the movable mold plate and the fixed mold plate, and includes a power output part and a mold clamping power device, wherein the direction of the mold clamping force provided by the mold clamping power device is the same as the direction of the pulling force provided by the locking tie rod corresponding to the movable mold plate and is arranged in parallel in the area surrounded by multiple locking tie rods.

2. The two-platen injection molding machine with electric mold opening and closing according to claim 1, Features: Each of the transmission wheels is connected to the corresponding locking nut and is positioned on the movable platen through a connecting sleeve.

3. The two-platen injection molding machine with electric mold opening and closing according to claim 1, Features: The synchronous transmission member is a synchronous belt, a connecting rod transmission member or a gear transmission member.

4. The two-platen injection molding machine with electric mold opening and closing according to claim 1, Features: A partitioned internal thread bite section is formed on the inner wall of each of the locking nuts, and a partitioned external thread bite section is formed on the corresponding locking rod, wherein when the locking nut and the locking rod are locked, the internal thread bite section and the external thread bite section are relatively engaged; when the locking nut and the locking rod are unlocked, the internal thread bite section and the external thread bite section are relatively staggered.

5. The two-platen injection molding machine with electric mold opening and closing according to claim 4, Features: The internal thread bite section has two sections and is correspondingly arranged on the opposite sides of the inner wall of the locking nut; the external thread bite section is correspondingly arranged on the opposite sides of the locking rod, wherein after the locking nut is rotated 90° forward or reverse, the internal thread bite section and the external thread bite section switch between a relatively staggered state and a relatively engaged state.

6. The two-platen injection molding machine with electric mold opening and closing according to claim 1, Features: The power output part is a mold mounting plate arranged on the movable mold plate, and the mold closing power device is a locking high-pressure oil cylinder whose two ends are respectively connected between the mold mounting plate and the movable mold plate, wherein the center of the locking high-pressure oil cylinder is arranged to coincide with the center of the area surrounded by the multiple locking tie rods.

7. The two-platen injection molding machine with electric mold opening and closing according to claim 1, Features: A mold mounting plate and a mold connecting sleeve with two ends respectively connected between the mold mounting plate and the movable mold plate are formed on the movable mold plate, wherein the mold connecting sleeve is hollow and annular inside, and a plurality of slide grooves extending along the length direction of the locking rod are formed on the connecting sleeve, and the mold clamping power device includes a slide seat respectively matched with each of the slide grooves and slidably arranged on the mold connecting sleeve along the length direction of the slide groove, an ejector rod arranged on the slide seat and capable of passing through the mold mounting plate, and a power cylinder for driving the slide seat to move between the mold mounting plate and the movable mold plate, and the ejector rod tightens or loosens the mold from the end passing through the mold mounting plate as the power cylinder moves.

8. A two-platen injection molding machine with electric mold opening and closing according to any one of claims 1 to 7, Features: The mold shifting mechanism includes a fixed seat arranged on the fixed mold plate or the machine base, a screw rod matched with the fixed seat and arranged parallel to the clamping rod, and a mold shifting power device for driving the screw rod to rotate around its own axis and position it on the movable mold plate.

9. The two-platen injection molding machine with electric mold opening and closing according to claim 8, Features: The screw rod is a ball screw rod, and the mold shifting power device includes a driving motor whose axis line coincides with the axis line of the ball screw rod, and a coupling used to connect the output shaft of the driving motor with the end of the ball screw rod away from the fixed seat, and the clutch is arranged on the coupling or the output shaft.

10. The two-platen injection molding machine with electric mold opening and closing according to claim 8, Features: The screw rods are ball screw rods, and there are two of them, wherein the two ball screw rods are correspondingly arranged on the opposite sides of the fixed template and distributed diagonally up and down.

11. The two-platen injection molding machine with electric mold opening and closing according to claim 10, Features: The mold shifting power device includes a driving motor whose axis is arranged parallel to the ball screw, and a transmission component for connecting the output shaft of the driving motor with the end of the ball screw away from the fixed seat, and the clutch is arranged on the output shaft.

12. The two-platen injection molding machine with electric mold opening and closing according to claim 11, Features: The transmission component includes an output wheel arranged on the output shaft, a transmission wheel arranged at the end of the screw rod away from the fixed seat, and a synchronous connecting member that synchronously connects the output wheel and the transmission wheel, wherein the synchronous connecting member is a conveyor belt, a connecting rod transmission member or a gear transmission member.

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