Coherent mold opening and closing device

Abstract

The utility model relates to a continuous mold opening and closing device. The continuous mold opening and closing device comprises a mold moving assembly, a mold locking assembly and a clutch, on one hand, on the premise that mold moving and mold locking are conducted synchronously without stopping, the probability of tooth skipping can be greatly reduced, then the mold position is accurately controlled, the mold opening and closing precision is effectively improved, and the product yield is improved; on the other hand, the screwing force between the nut and the screw is transmitted through the rod piece, power transmission is reliable, and the success rate of mold locking can be ensured.

Description

Technical Field

[0001] The utility model belongs to the field of mold opening and closing equipment, and in particular relates to a continuous mold opening and closing device. Background Art

[0002] The mold closing process of the two-platen injection molding machine mainly includes the mold shifting process and the mold locking process.

[0003] At present, the mold opening and closing equipment of the existing injection molding machine generally includes a mold shifting assembly and a mold locking assembly which is transmission-connected to the mold shifting assembly through a clutch, wherein the mold shifting assembly includes a screw rod which is arranged on the movable template and forms a threaded match with the fixed template, and a motor which drives the screw rod to rotate; the mold locking assembly includes a nut arranged on the movable template and a screw rod arranged on the fixed template. Therefore, during the mold shifting process, the clutch is in a disengaged state, and the screw rod is driven to rotate by the motor, thereby driving the movable template to move toward the fixed template to a specified position. Then, during the mold locking process, the clutch is in an engaged state. Under the power output of the motor, the screw rod rotates synchronously and screws with the nut to achieve locking.

[0004] However, in actual operation, the above-mentioned mold opening and closing equipment has the following defects:

[0005] 1. The existing clutch is generally a tooth clutch purchased from the market. Under the premise that the mold shifting and mold locking are carried out synchronously without stopping, since the teeth and slots are always in relative motion, there is a high probability that the teeth cannot be accurately inserted into the slots at one time, and it is easy to jump teeth. The accuracy is not enough, it is difficult to meet the production requirements, and it is also easy to cause damage to the equipment;

[0006] 2. When the clutch is in the engaged state, the power of the motor is generally transmitted to the screw through the belt, and the belt is easy to wear. After repeated use, it is easy to cause power transmission failure, resulting in failure to successfully lock the mold and low reliability. Summary of the invention

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an improved continuous mold opening and closing device.

[0008] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0009] A continuous mold opening and closing device, comprising:

[0010] A mold shifting assembly, which is used to drive the tail plate to move toward or away from the head plate;

[0011] The clamping assembly includes a plurality of screws fixed on the head plate and extending along the moving direction of the tail plate, a nut arranged on the tail plate and capable of one-to-one matching with each screw, and a transmission component.

[0012] The mold opening and closing device also includes a clutch, which includes a first disk body and a second disk body that move toward each other to engage or separate, and the mold shifting assembly is used to drive the first disk body to rotate around its own center line, and one of the first disk body and the second disk body has a plurality of grooves distributed in an annular manner formed on the disk surface, and the other has a plurality of teeth formed on the disk surface, wherein the length of the groove is d1, and the length of the tooth is d2, and when the first disk body and the second disk body switch from a separated state to an engaged state, the displacement of the tooth portion relative to the groove is d3, 0<d3<d1-d2, and each tooth portion is correspondingly inserted into each groove;

[0013] The transmission component includes a turntable, an active rod, and a driven rod, wherein the turntable is fixedly connected to the second disk body, and the active rod is rotatably connected between the turntable and adjacent nuts; there are multiple driven rods, and they are correspondingly rotatably connected between each two adjacent nuts. When the first disk body and the second disk body are movably engaged, the two ends of the active rod respectively make eccentric motion around the center of the second disk body and the nut, and the end of each driven rod synchronously makes eccentric motion around the center of the corresponding nut, and multiple nuts are synchronously screwed with the corresponding screws.

[0014] Preferably, when the first disc and the second disc are in a separated state, the spacing between the disc surface of the first disc and the disc surface of the second disc is 0.25-0.35 mm. Compared with the existing clutch, by further reducing the gap between the first and second discs, the displacement of the teeth can be reduced during the movement engagement process, and the probability of tooth jumping can be further effectively reduced.

[0015] Preferably, 1.15d2≤d1≤1.25d2.

[0016] According to a specific implementation and preferred aspect of the utility model, in the orthographic projection in the direction of the clutch centerline, each tooth portion is a rectangular tooth; and / or, a plurality of grooves are distributed in a circular array around the clutch centerline. Here, the structure is simple and easy to process.

[0017] Preferably, in the orthographic projection of the screw rod axial direction, a closed transmission path is formed between the rotating disk, the active rod, the driven rod and the nut, thereby forming a reliable transmission and facilitating the improvement of precision.

[0018] Specifically, there are four screw rods, which are distributed at the four corners of the head plate; the turntable is located between the two nuts in the lower row, and there are at least two active rods, which are rotatably connected between the turntable and the two nuts in the lower row. Here, the layout is reasonable and easy to assemble.

[0019] Preferably, there are three active rods, two of which are located on opposite sides of the center of the turntable and are rotatably connected between the turntable and the nut on the same side, and the other active rod is rotatably connected between the turntable and the nut on the other side.

[0020] Specifically, the lines connecting the rotational connections of the three active rods on the turntable form an isosceles triangle. In this way, during the transmission process, the turntable can be kept evenly stressed, thereby reducing the deformation of the turntable and the clutch and increasing the service life.

[0021] According to another specific implementation and preferred aspect of the utility model, the mold shifting assembly includes a sleeve arranged on the head plate or the tail plate and having a thread formed inside, a screw rod threadedly matched with the sleeve and extending along the moving direction of the tail plate, and a driving component for driving the screw rod to rotate around its own center line and positioned on the tail plate.

[0022] Preferably, the sleeve is arranged on the head plate; there are two screw rods, wherein the two screw rods are arranged on opposite sides of the tail plate and are diagonally distributed up and down; the driving component includes a motor, a driving pulley fixedly connected to the output shaft of the motor, a driven pulley fixed to the end of each screw rod, and a transmission belt connected between the driving pulley and the driven pulley, wherein the driving pulley is fixedly connected to the first disk body; the driving component also includes an adjusting wheel that can move in the horizontal direction to adjust the tension of the transmission belt. Here, as the belt wears, the belt tension can be adjusted by adjusting the adjusting wheel to extend its service life.

[0023] Due to the implementation of the above technical solution, the utility model has the following advantages compared with the prior art:

[0024] The clutch of the mold opening and closing equipment in the prior art is prone to tooth jumping, resulting in insufficient precision and equipment damage, and the mold is locked using belt transmission power, which has low reliability. The present application makes an overall design for the structure of continuous mold opening and closing, which ingeniously solves the shortcomings and defects of the prior art. After adopting the continuous mold opening and closing device, when the head plate moves to the specified position, the clutch switches from the disengaged state to the engaged state. Since the groove in the clutch and the corresponding tooth portion form a gap due to the length difference, and the displacement of the tooth portion relative to the groove is less than the length difference between the groove and the tooth portion, the tooth portion can be accurately inserted into the corresponding groove; then the power of the mold shifting assembly is output to the transmission component through the clutch, and the turntable rotates accordingly and drives the two ends of the active rod to perform eccentric movement around the center of the second disk body and the nut respectively, and the end of each driven rod synchronously performs eccentric movement around the center of the corresponding nut, thereby driving multiple nuts to synchronously rotate with the corresponding screw rod to achieve mold locking. Therefore, compared with the prior art, on the one hand, the utility model can greatly reduce the probability of tooth jumping under the premise of synchronous mold shifting and mold locking without stopping, thereby accurately controlling the mold position, effectively improving the mold opening and closing accuracy, and improving the product yield; on the other hand, the rotating force between the nut and the screw rod is transmitted by the rod member, and the power transmission is reliable, which can ensure the success rate of mold locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the continuous mold opening and closing device of this embodiment;

[0026] Figure 2 for Figure 1 A schematic diagram of the main view;

[0027] Figure 3 for Figure 1 An enlarged schematic diagram of the structure of the middle clutch;

[0028] Among them: 1. mold transfer assembly; 10. sleeve; 11. screw; 12. driving component; 120. motor; 121. driving pulley; 122. driven pulley; 123. transmission belt; 124. auxiliary pulley; 125. adjusting wheel;

[0029] 2. Clamping assembly; 20. Screw rod; 21. Nut; 22. Transmission component; 220. Turntable; 221. Active rod; 222. Driven rod;

[0030] 3. Clutch; 31. First plate; 32. Second plate; b. Tooth; c. Groove;

[0031] B1, tail board; B2, head board. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] like Figures 1 to 3 As shown, the continuous mold opening and closing device of this embodiment includes a mold shifting assembly 1, a mold locking assembly 2, and a clutch 3.

[0039] Specifically, the mold shifting assembly 1 is used to drive the tail plate B1 to move toward or away from the head plate B2, and includes a sleeve 10 with a thread formed inside, which is arranged on the head plate B2 or the tail plate B1, a screw rod 11 threadedly matched with the sleeve 10 and extending along the moving direction of the tail plate B1, and a driving component 12 for driving the screw rod 11 to rotate around its own center line and positioned on the tail plate B1; the mold locking assembly 2 includes a plurality of screw rods 20 fixed on the head plate B2 and extending along the moving direction of the tail plate B1, a nut 21 arranged on the tail plate B1 and capable of one-to-one matching with each screw rod 20, and a transmission component 22; the clutch 3 includes a first disk body 31 and a second disk body 32 that move toward each other to engage or separate.

[0040] In this example, the sleeve 10 is arranged on the head plate B2; there are two screw rods 11, wherein the two screw rods 11 are correspondingly arranged on the opposite sides of the tail plate B1 and distributed diagonally up and down. When the mold is moved, the screw rod 11 is inserted into the corresponding sleeve 10, and as the screw rod 11 rotates, the tail plate B1 and the head plate B2 are driven to open and close the mold.

[0041] The driving component 12 includes a motor 120 fixedly connected to the bottom center of the tail plate B1, a driving pulley 121 fixedly connected to the output shaft of the motor 120, a driven pulley 122 fixed to the end of each screw rod 11, and an annular transmission belt 123 connected between the driving pulley 121 and the driven pulley 122, wherein the driving pulley 121 is fixedly connected to the first disk body 31. In some specific embodiments, an auxiliary pulley 124 is provided on the tail plate B1 to increase the space enclosed by the transmission belt 123 to avoid blocking the clamping assembly 2.

[0042] For ease of implementation, the driving component 12 also includes an adjusting wheel 125 that can move in a horizontal direction to adjust the tension of the transmission belt 123. In some specific embodiments, a horizontally extending adjusting slot is provided on the tail plate B1, and the adjusting wheel 125 is adjusted horizontally left and right along the adjusting slot by a bolt.

[0043] In this example, there are four screws 20, which are distributed at the four corners of the head plate B2, and in the axial orthographic projection of the screws 20, the connecting lines between the four screws 20 form a rectangle. As for the connection structure between the screws 20 and the head plate B2, and the specifications of the screws 20 and the nuts 21, they are selected according to the actual working conditions and are not limited here.

[0044] In this example, the transmission component 22 includes a turntable 220, an active rod 221, and a driven rod 222, wherein the turntable 220 is fixedly connected to the second disk body 32 by bolts, and the active rod 221 is rotatably connected between the turntable 220 and the adjacent nuts 21; there are multiple driven rods 222, and they are correspondingly rotatably connected between each two adjacent nuts 21. When the first disk body 31 and the second disk body 32 are moved and engaged, the two ends of the active rod 221 respectively make eccentric motion around the center of the second disk body 32 and the nut 21, and the end of each driven rod 222 synchronously makes eccentric motion around the center of the corresponding nut 21, and multiple nuts 21 are synchronously screwed with the corresponding screw rods 20.

[0045] Specifically, the rotating disk 220 is located between the two nuts 21 in the lower row, and there are at least two active rods 221, which are respectively rotatably connected between the rotating disk 220 and the two nuts 21 in the lower row. In some specific embodiments, there are three active rods 221, two of which are located on opposite sides of the center of the rotating disk 220 and are rotatably connected between the rotating disk 220 and the nuts 21 on the same side, and the other active rod 221 is rotatably connected between the rotating disk 220 and the nuts 21 on the other side.

[0046] To further facilitate implementation, the lines connecting the rotating connections of the three active rods 221 on the turntable 220 form an isosceles triangle; in the axial orthographic projection of the screw rod 20, a closed transmission path is formed between the turntable 220, the active rod 221, the driven rod 222 and the nut 21.

[0047] In this example, the clutch 3 is an electromagnetic clutch, and the first disc body 31 and the second disc body 32 are respectively sleeved on the output shaft of the motor 120, wherein the first disc body 31 is fixedly connected to the driving pulley 121 by bolts, and the second disc body 32 is connected to the output shaft of the motor 120 by a deep groove bearing. When the mold is moved, the motor 120 drives the first disc body 31 to rotate around its own center line through the driving pulley 121; one of the first disc body 31 and the second disc body 32 forms a plurality of grooves c distributed in an annular manner from the disc surface, and the other forms a plurality of teeth b from the disc surface, wherein the length of the groove c is d1, and the length of the tooth b is d2. When power is turned on, the first disc body 31 and the second disc body 32 switch from the separation state to the engagement state, and the displacement of the tooth b relative to the groove c is d3, 0<d3<d1-d2, and each tooth b is correspondingly inserted into each groove c.

[0048] In some specific embodiments, when the first disk body 31 and the second disk body 32 are in a separated state, the distance between the disk surface of the first disk body 31 and the disk surface of the second disk body 32 is 0.25-0.35 mm, preferably, the distance is 0.3 mm.

[0049] At the same time, 1.15d2≤d1≤1.25d2.

[0050] Furthermore, in the orthographic projection in the direction of the center line of the clutch 3, a plurality of grooves c are distributed in a circular array around the center line of the clutch 3, and each tooth portion b extends around the center line of the clutch 3 and is approximately rectangular.

[0051] In summary, after adopting the continuous mold opening and closing device, when the head plate moves to the specified position, the clutch switches from the disengaged state to the engaged state. Since the groove in the clutch and the corresponding tooth portion form a gap due to the length difference, and the displacement of the tooth portion relative to the groove is less than the length difference between the groove and the tooth portion, the tooth portion can be accurately inserted into the corresponding groove; then the power of the mold shifting assembly is output to the transmission component through the clutch, and the turntable rotates accordingly and drives the two ends of the active rod to perform eccentric motion around the center of the second disk body and the nut respectively, and the end of each driven rod synchronously performs eccentric motion around the center of the corresponding nut, thereby driving multiple nuts to synchronously rotate with the corresponding screw rods to achieve mold locking. Therefore, compared with the prior art, the utility model can greatly reduce the time and effort of mold shifting and mold locking on the premise of synchronous and non-stop mold shifting and mold locking. The probability of tooth jumping is low, and the mold position can be accurately controlled, the opening and closing accuracy of the mold can be effectively improved, and the product yield rate can be improved; on the other hand, the rotational force between the nut and the screw is transmitted by the rod, and the power transmission is reliable, which can ensure the success rate of mold locking; thirdly, compared with the existing clutch, by further reducing the gap between the first and second disk bodies, the displacement of the teeth can be reduced during the motion engagement process, and the probability of tooth jumping can be further effectively reduced; fourthly, by forming a closed transmission path, a reliable transmission can be formed, which is beneficial to improving accuracy; fifthly, during the transmission process, the turntable can be kept under uniform force, thereby reducing the deformation of the turntable and the clutch and increasing the service life; sixthly, as the belt wears, the belt tension can be adjusted by adjusting the adjusting wheel to extend its service life.

[0052] The above detailed description of the utility model is intended to enable people familiar with the technology in this field to understand the content of the utility model and implement it. It is not intended to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A continuous mold opening and closing device, comprising: A mold shifting assembly, which is used to drive the tail plate to move toward or away from the head plate; The clamping assembly comprises a plurality of screws fixed on the head plate and extending along the moving direction of the tail plate, a nut arranged on the tail plate and capable of one-to-one matching with each of the screws, and a transmission component, wherein: The mold opening and closing device further includes a clutch, the clutch includes a first disk body and a second disk body that move toward each other to engage or separate, the mold shifting assembly is used to drive the first disk body to rotate around its own center line, one of the first disk body and the second disk body has a plurality of grooves distributed in an annular manner formed on the disk surface, and the other has a plurality of teeth formed on the disk surface, wherein the length of the groove is d1, and the length of the tooth is d2, when the first disk body and the second disk body switch from a separated state to an engaged state, the displacement of the tooth portion relative to the groove is d3, 0<d3<d1-d2, and each of the teeth is correspondingly inserted into each of the grooves; The transmission component includes a turntable, an active rod, and a driven rod, wherein the turntable is fixedly connected to the second disk body, and the active rod is rotatably connected between the turntable and the adjacent nuts; there are multiple driven rods, and they are correspondingly rotatably connected between every two adjacent nuts. When the first disk body and the second disk body are movably engaged, the two ends of the active rod respectively make eccentric motion around the center of the second disk body and the nut, and the end of each driven rod synchronously makes eccentric motion around the center of the corresponding nut, and multiple nuts are synchronously screwed with the corresponding screw rods.

2. The continuous mold opening and closing device according to claim 1, characterized in that: When the first disk body and the second disk body are in a separated state, the distance between the disk surface of the first disk body and the disk surface of the second disk body is 0.25-0.35 mm.

3. The continuous mold opening and closing device according to claim 1, characterized in that: 1.15d2≤d1≤1.25d2.

4. The continuous mold opening and closing device according to claim 1, characterized in that: In the orthographic projection in the direction of the clutch centerline, each of the tooth portions is a rectangular tooth; and / or, a plurality of the grooves are distributed in a circular array around the clutch centerline.

5. The continuous mold opening and closing device according to claim 1, characterized in that: In the orthographic projection of the screw rod in the axial direction, a closed transmission path is formed between the rotating disk, the active rod, the driven rod and the nut.

6. The continuous mold opening and closing device according to claim 5, characterized in that: There are four screw rods distributed at the four corners of the head plate; the turntable is located between the two nuts in the lower row; there are at least two active rods, which are rotatably connected between the turntable and the two nuts in the lower row.

7. The continuous mold opening and closing device according to claim 6, characterized in that: There are three active rods, two of which are located on opposite sides of the center of the turntable and are rotatably connected between the turntable and the nut on the same side, and the other active rod is rotatably connected between the turntable and the nut on the other side.

8. The continuous mold opening and closing device according to claim 7, characterized in that: The connecting lines between the rotational connections of the three active rods on the rotating disk form an isosceles triangle.

9. The continuous mold opening and closing device according to claim 1, characterized in that: The mold shifting assembly includes a sleeve arranged on the head plate or the tail plate and having a thread formed inside, a screw rod threadedly matched with the sleeve and extending along the moving direction of the tail plate, and a driving component used to drive the screw rod to rotate around its own center line and positioned on the tail plate.

10. The continuous mold opening and closing device according to claim 9, characterized in that: The sleeve is arranged on the head plate; there are two screw rods, wherein the two screw rods are correspondingly arranged on opposite sides of the tail plate and distributed diagonally up and down; the driving component includes a motor, a driving pulley fixedly connected to the output shaft of the motor, a driven pulley fixed to the end of each screw rod, and a transmission belt connected between the driving pulley and the driven pulley, wherein the driving pulley is fixedly connected to the first disk body; the driving component also includes an adjusting wheel that can move in a horizontal direction to adjust the tension of the transmission belt.

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