Extrusion device drive mechanism

Abstract

The utility model discloses extrusion device drive mechanism, including extrusion device, the extrusion device sets up on the fixed plate, the injection rod of extrusion device sets up on the lifting plate, be provided with the guide rod on the fixed plate, the lifting plate sets up on the guide rod, be provided with two groups of screw rod subassembly between the lifting plate with the fixed plate, two groups of screw rod subassembly are located the both sides of extrusion device respectively, and two groups of screw rod subassembly synchronous drive lifting plate elevating along the guide rod, the screw rod power device of screw rod subassembly sets up on the lifting plate, and is located the bottom of lifting plate.

Description

Technical Field

[0001] This utility model belongs to the technical field of zipper injection molding machine, specifically relating to an extrusion device drive mechanism for driving the lifting and lowering of the extrusion device and adjusting the distance between the extrusion head and the mold. Background Technology

[0002] Zipper injection molding machines require a lifting mechanism (such as a pneumatic or hydraulic cylinder) to drive the extrusion unit to rise and fall, thereby extruding material into the injection mold to complete the injection molding process. However, in existing technologies, the lifting mechanism of the extrusion unit is usually located above the extrusion unit. Since the extrusion unit itself already has a certain height (including heating, stirring, and other components), placing the lifting mechanism above it further increases the overall height of the zipper injection molding machine (usually by more than 20 cm), making it difficult to transport the entire machine using standard elevators or vans, causing inconvenience for relocation and transportation on the production site. Moreover, placing the lifting mechanism above the extrusion unit not only increases the equipment height but also hinders daily maintenance and repair.

[0003] For example, CN203141746U discloses an injection molding zipper machine with an energy-saving power unit. The extrusion device includes an extrusion screw on a frame, with an extrusion screw drive cylinder located at the end of the extrusion screw away from the injection mold. The side of the extrusion screw away from the extrusion screw drive cylinder is the extrusion head, which extends into or retracts from the injection mold with the reciprocating motion of the extrusion screw. While this solution achieves the basic functions, it still does not solve the problem of the excessively high equipment height. Utility Model Content

[0004] The purpose of this invention is to provide a compact and well-balanced extrusion device drive mechanism to reduce the overall height of the equipment, improve operational stability, and facilitate transportation and maintenance.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0006] An extrusion device drive mechanism includes an extrusion device mounted on a fixed plate, an injection rod mounted on a lifting plate, a guide rod on the fixed plate, a lifting plate mounted on the guide rod, and two sets of lead screw assemblies between the lifting plate and the fixed plate. The two sets of lead screw assemblies are located on opposite sides of the extrusion device and synchronously drive the lifting plate to move up and down along the guide rod. The lead screw power unit (motor, servo motor, or other similar power component) of the lead screw assembly is mounted on the lifting plate and located at the bottom of the lifting plate.

[0007] Furthermore, the injection rod is rotatably connected to the lifting plate via an axial limiting mechanism. The driving power device (motor, servo motor, or other similar power component) for the injection rod is mounted on the lifting plate and located at its bottom. The injection rod is equipped with an injection rod drive wheel, and the driving power device is equipped with an injection rod drive wheel. The injection rod drive wheel and the injection rod drive wheel are connected by an injection rod drive belt.

[0008] Alternatively, the two sets of lead screw assemblies are connected to the lead screw power unit via a synchronous transmission assembly. Specifically, the synchronous transmission assembly includes synchronous pulleys on the two sets of lead screw assemblies, a power pulley on the lead screw power unit, and a synchronous belt.

[0009] Alternatively, the lead screw assembly includes a screw and a nut. The screw is rotatably connected to the lifting plate via an axial limiting mechanism, and the nut is mounted on a fixed plate. The lead screw power unit drives the screw to rotate. The screw rotates on the nut, thus raising and lowering the lifting plate.

[0010] Alternatively, the axial limiting mechanism includes a convex ring limiting cavity, in which a convex ring is disposed, and the convex ring is disposed on a rotating body (screw or injection rod).

[0011] Alternatively, the convex ring limiting cavity is composed of a limiting cylinder. At the upper end of the convex ring, a first convex ring limiting block extending inward is provided on the inner wall of the limiting cylinder, and at the lower end of the convex ring, a second convex ring limiting block extending inward is provided on the inner wall of the limiting cylinder.

[0012] Alternatively, the rotating body includes a main body and an axial limiting part, the outer diameter of the axial limiting part being smaller than that of the main body, a convex ring being disposed on the axial limiting part, the main body being located below the convex ring, and an axial displacement limiting ring being disposed at the upper end of the convex ring, the axial displacement limiting ring being threadedly connected to the axial limiting part.

[0013] To detect the displacement of the lifting plate and facilitate control of its lifting height, multiple sensors are installed between the lifting plate and the fixed plate. These sensors are arranged sequentially along the height direction. A positioning block is installed on the lifting plate, and the sensors are used to detect the height of the positioning block.

[0014] This invention places the power unit on the lifting plate and at the bottom of the lifting plate, which can reduce the overall height of the equipment and facilitate transportation. At the same time, the synchronous driving of the lifting plate by two sets of lead screw assemblies not only improves the balance of the lifting plate, but also improves the pressure stability and injection molding effect of the extrusion device.

[0015] The extrusion device drive mechanism provided by this utility model has a compact structure and excellent balance. It can not only effectively reduce the overall height of the equipment and facilitate transportation and maintenance, but also reduce the manufacturing cost of the equipment and improve the operational stability and injection molding effect. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a first-view structural diagram of the extrusion device drive mechanism.

[0018] Figure 2 This is a schematic diagram of the second-view structure of the extrusion device drive mechanism.

[0019] Figure 3 This is a schematic diagram of the second-view portion of the extrusion device drive mechanism.

[0020] Figure 4 This is a schematic diagram of the lead screw assembly and axial limiting mechanism.

[0021] Figure 5 This is a schematic diagram of the axial limiting mechanism. Detailed Implementation

[0022] like Figure 1-5 As shown, the extrusion device drive mechanism includes an extrusion device 1, which is mounted on a fixed plate 2. Four guide rods (shown in the diagram, located around the perimeter of the fixed plate 2) are mounted on the fixed plate 2. A lifting plate 3 is slidably connected to the guide rods. The injection rod 11 of the extrusion device 1 is rotatably connected to the lifting plate 3 via an axial limiting mechanism. This axial limiting mechanism allows the injection rod to not only rise and fall synchronously with the lifting plate but also rotate on the lifting plate. Rotation of the injection rod 11 pushes the material in the hopper into the extrusion device 1 and agitates it. However, this is a conventional technique in the prior art, so its specific structure and principle will not be described in detail. Since the agitator rod of some extrusion devices does not need to rotate, the injection rod 11 can also be directly connected to the lifting plate. Of course, the injection rod does not need to be equipped with the driving power device described below.

[0023] A power mounting plate 31 is provided on the left side of the lifting plate 3, and the power mounting plate 31 is connected to the lifting plate 3. Of course, the power mounting plate 31 can also be an extension of one side of the lifting plate 3. The drive power device 8 is provided on the power mounting plate 31 and is located at the bottom of the power mounting plate 31. The drive power device 8 drives the injection rod 11 to rotate through the transmission components. Specifically, the drive power device 8 is a motor (or a servo motor or other power components of the same type). The drive power device 8 is located at the bottom of the power mounting plate 31. The transmission components include an injection rod drive wheel 81, an injection rod transmission wheel 82, and an injection rod transmission belt 83. The injection rod drive wheel 81 is located at the top of the power mounting plate 31 and is connected to the rotating shaft of the drive power device 8. The injection rod transmission wheel 82 is located at the top of the lifting plate 3 and is connected to the injection rod 11. The drive power device 8 drives the injection rod drive wheel 81 to rotate, and the injection rod drive wheel 81 drives the injection rod transmission wheel 82 to rotate through the injection rod transmission belt 83, thereby realizing the rotation of the injection rod 11. Of course, the transmission components between the drive power unit and the injection rod can also adopt transmission mechanisms commonly found in the prior art. For example, the drive power unit and the injection rod are each equipped with gears, and the two gears mesh; or an intermediate wheel is provided between the two gears, and the two gears mesh evenly with the intermediate wheel; or the two gears are driven by a chain. Of course, the injection rod drive wheel and the injection rod transmission wheel can also be located at the bottom of the lifting plate.

[0024] Two sets of lead screw assemblies 4 and 5 are arranged between the lifting plate 3 and the fixed plate 1. The two sets of lead screw assemblies 4 and 5 are located on both sides of the extrusion device 1, as shown in the attached figure. Figure 1-2 As shown, lead screw assembly 4 is located on the front side of extrusion device 1, and lead screw assembly 5 is located on the rear side of extrusion device 1. Of course, the two sets of lead screw assemblies 4 and 5 are arranged on the left and right sides of extrusion device 1.

[0025] Taking lead screw assembly 4 as an example, the lead screw assembly includes a screw 41 and a nut 42 threadedly connected to the screw 41. The nut 42 is mounted on a nut seat 43, which is mounted on a fixed plate 2. The nut seat 43 raises the height of the nut 42, creating a certain gap between the nut 42 and the fixed plate 2, allowing the screw 41 to move up and down on the nut 42. Alternatively, to allow the screw 91 to move up and down on the nut 92, a nut with a certain height can be selected; in this case, the nut does not need to be raised by the nut seat 43. The screw 41 is rotatably connected to the lifting plate 3 via an axial limiting mechanism. This axial limiting mechanism allows the screw 41 to not only move up and down synchronously with the lifting plate 3 but also to rotate on the lifting plate 3. Similarly, lead screw assembly 5 adopts the same structure as lead screw assembly 4.

[0026] On the same side (left side of extrusion device 1) of the two sets of lead screw assemblies 4 and 5, a lead screw power unit 8 is installed. The lead screw power unit 8 is mounted on the power mounting plate 31 and located at the bottom of the power mounting plate 31. The lead screw power unit 8 drives the two sets of lead screw assemblies 4 and 5 to rotate synchronously via a synchronous transmission assembly, thereby causing the lifting plate 3 to rise and fall along the guide rod. Specifically, the lead screw power unit 9 is a motor (or a servo motor or other similar power component). The lead screw power unit 9 is located at the bottom of the power mounting plate 31. The synchronous transmission assembly includes synchronous pulleys 92 and 93, a power pulley 91, and a synchronous belt 95. Synchronous pulleys 92 and 93 are located on the top of the lifting plate 3 and are respectively connected to the screws of the lead screw assemblies 4 and 5. Figure 1-3 As shown, synchronous pulley 92 is mounted on the screw of lead screw assembly 4, synchronous pulley 93 is mounted on the screw of lead screw assembly 5, and drive pulley 91 is located on the top of drive mounting plate 31 and connected to the rotating shaft of lead screw power device 9. Lead screw power device 9 drives drive pulley 91 to rotate, and drive pulley 91 drives two synchronous pulleys 92 and 93 to rotate via synchronous belt 95, thereby driving the two sets of lead screw assemblies 4 and 5 to rotate synchronously, realizing the lifting plate 3 to rise and fall along the guide rod. Of course, the synchronous transmission assembly can also adopt a synchronous transmission mechanism commonly used in the prior art. For example, a drive gear is set on the rotating shaft of the lead screw power device, and a transmission gear is set on the screw, with the drive gear meshing with two transmission gears; or the drive gear meshes with an intermediate gear, and the intermediate gear meshes with two transmission gears; or the drive gear drives two transmission gears via a chain. Of course, synchronous pulleys 92 and 93 and drive pulley 91 can also be located at the bottom of lifting plate 3 (or drive mounting plate 31). Of course, the nut 42 can also be set on the lifting plate 3, and the screw 41 is rotatably connected to the fixed plate 2 through the screw seat. The rotation of the screw 41 causes the nut 3 to rise and fall, thereby realizing the lifting of the lifting plate 3.

[0027] To avoid interference with the timing belt by the injection rod and to change the direction of the timing belt 95, a guide wheel 94 is provided on the injection rod 11, and the guide wheel 94 is located above the injection rod drive wheel 82.

[0028] As another driving method for the lead screw assembly, the lead screw power device can also drive the nut to rotate. The nut is rotatably connected to the lifting plate 3 through the axial limiting mechanism. The nut can rise and fall synchronously with the lifting plate 3, or it can rotate on the lifting plate 3. The screw is rotatably connected to the fixed seat 2 through the screw seat. The lead screw power device drives the screw to rotate, and the nut is displaced on the screw, thereby realizing the rise and fall of the lifting plate 3.

[0029] Axial limiting mechanism, such as Figure 4-5As shown, taking the axial limiting mechanism on the lead screw assembly 4 as an example, the axial limiting mechanism includes a convex ring limiting cavity on the lifting plate 3. A convex ring 64 is provided inside the convex ring limiting cavity, and the convex ring 64 is disposed on the rotating body (the screw 41 of the lead screw assembly 4). Specifically, the convex ring limiting cavity is composed of a limiting cylinder 61. At the upper end of the convex ring 64, a first convex ring limiting block 62 extending inward is provided on the inner wall of the limiting cylinder 61. At the lower end of the convex ring 64, a second convex ring limiting block 43 extending inward is provided on the inner wall of the limiting cylinder 61. The second convex ring limiting block 43 is composed of an end cap and is detachably connected to the limiting cylinder 61 so that the convex ring 64 is positioned between the first convex ring limiting block 62 and the second convex ring limiting block 63. Of course, the first convex ring limiting block 62 can also be detachable. Of course, the convex ring limiting cavity can also use other common limiting mechanisms to limit the axial displacement of the rotating body on the lifting plate.

[0030] The screw 41 includes a main body and an axial limiting part. The outer diameter of the axial limiting part is smaller than that of the main body. A convex ring 64 is disposed on the axial limiting part. The lower end of the convex ring 64 is the main body, and the upper end is provided with an axial displacement limiting ring 65. The axial displacement limiting ring 65 is threadedly connected to the axial limiting part. The axial displacement limiting ring limits the convex ring 64 on the screw 41, and then further limits the convex ring 41 axially through the convex ring limiting cavity, so that the screw 41 can not only rotate on the lifting plate 3, but also rise and fall synchronously with the lifting plate 3. Of course, the convex ring 64 can also be a protrusion on the screw 41. In this case, the axial displacement limiting ring 65 is not required on the rotating body. Figure 5 As shown, the convex ring 64 is composed of multiple bearings, with five bearings shown in the figure.

[0031] Of course, the axial limiting mechanism can also adopt other common axial limiting methods. For example, the screw 41 is provided with an annular groove, and the lifting plate 3 is provided with multiple limiting pins. The multiple limiting pins are distributed along the circumference of the screw, and the head end of the limiting pin is located in the annular groove.

[0032] Similarly, the axial limiting mechanism on the screw of the lead screw assembly 5, the axial limiting mechanism on the injection rod 11, and the axial limiting mechanism on the nut can also adopt the same axial limiting mechanism as that on the screw 41.

[0033] like Figure 3 As shown, to facilitate control of the lifting height of the lifting plate 3, multiple sensors (three are shown in the diagram) are installed between the lifting plate 3 and the fixed plate. The three sensors 91, 92, and 93 are arranged sequentially along the height direction (at different heights). The sensors are photoelectric switches or other sensors. The lifting plate 3 is equipped with a positioning block 74, and the sensors are used to detect the height of the positioning block 74. Specifically, three sensors are installed, with sensor 72 located in the middle, sensor 71 located above sensor 72, and sensor 73 located below sensor 72, to detect the three heights of the lifting plate 3.

[0034] The above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An extrusion device drive mechanism, comprising an extrusion device mounted on a fixed plate, an injection rod of the extrusion device mounted on a lifting plate, a guide rod mounted on the fixed plate, and the lifting plate mounted on the guide rod, characterized in that: Two sets of lead screw assemblies are provided between the lifting plate and the fixed plate. The two sets of lead screw assemblies are located on both sides of the extrusion device, and the two sets of lead screw assemblies synchronously drive the lifting plate to rise and fall along the guide rod. The lead screw power device of the lead screw assembly is set on the lifting plate and located at the bottom of the lifting plate.

2. The extrusion device drive mechanism according to claim 1, characterized in that: The injection rod is rotatably connected to the lifting plate via an axial limiting mechanism, and the driving power device for the injection rod is located on the lifting plate and at the bottom of the lifting plate.

3. The extrusion device drive mechanism according to claim 1, characterized in that: The injection rod is equipped with an injection rod drive wheel, and the driving power device is equipped with an injection rod drive wheel. The injection rod drive wheel and the injection rod drive wheel are connected by an injection rod drive belt.

4. The extrusion device drive mechanism according to claim 1, characterized in that: The two sets of lead screw assemblies are connected to the lead screw power unit through a synchronous transmission assembly.

5. The extrusion device drive mechanism according to claim 4, characterized in that: The synchronous transmission assembly includes synchronous pulleys on two sets of lead screw assemblies, a power pulley on the lead screw power device, and a synchronous belt.

6. The extrusion device drive mechanism according to claim 1, characterized in that: The lead screw assembly includes a screw and a nut. The screw is rotatably connected to the lifting plate through an axial limiting mechanism, and the nut is set on a fixed plate. The lead screw power device is used to drive the screw to rotate.

7. The extrusion device drive mechanism according to claim 2 or 6, characterized in that: The axial limiting mechanism includes a convex ring limiting cavity, in which a convex ring is provided, and the convex ring is disposed on the rotating body.

8. The extrusion device drive mechanism according to claim 7, characterized in that: The convex ring limiting cavity is composed of a limiting cylinder. At the upper end of the convex ring, a first convex ring limiting block extending inward is provided on the inner wall of the limiting cylinder, and at the lower end of the convex ring, a second convex ring limiting block extending inward is provided on the inner wall of the limiting cylinder.

9. The extrusion device drive mechanism according to claim 7, characterized in that: The rotating body includes a main body and an axial limiting part. The outer diameter of the axial limiting part is smaller than that of the main body. The convex ring is disposed on the axial limiting part. The lower end of the convex ring is the main body. The upper end of the convex ring is provided with an axial displacement limiting ring. The axial displacement limiting ring is threadedly connected to the axial limiting part.

10. The extrusion device drive mechanism according to claim 1, characterized in that: Multiple sensors are installed between the lifting plate and the fixed plate, and the sensors are arranged sequentially along the height direction. A positioning block is installed on the lifting plate, and the sensors are used to detect the height of the positioning block.

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