Accurate deviation adjusting device of plastic extruding machine

Abstract

The utility model relates to the field of plastic extruding machines, and particularly discloses a plastic extruding machine accurate deviation adjusting device which comprises two deviation adjusting positioning mechanisms and two deviation adjusting clamping mechanisms, each deviation adjusting positioning mechanism comprises a first abutting piece penetrating through a machine base in the radial direction of the machine base, and one end of each first abutting piece abuts against the outer side of an outer mold; a driving assembly used for driving the first abutting piece to slide in the radial direction of the machine base is arranged on the machine base. The deviation adjusting clamping mechanism comprises a second abutting piece penetrating through the machine base in the radial direction of the machine base, an elastic assembly used for driving the second abutting piece to elastically abut against the outer side of the outer mold is arranged on the machine base, and a locking assembly used for locking the position of the second abutting piece is further arranged on the machine base. The coaxiality of the inner die and the outer die of the plastic extruding machine can be conveniently and accurately adjusted, and the coaxiality can be reliably kept.

Description

Technical Field

[0001] This application relates to the field of extruders, and in particular to a precise alignment device for an extruder. Background Technology

[0002] Cable insulation is typically produced using an extruder. The extruder head contains nested inner and outer dies. The inner die is hollow and carries the cable core to be extruded. A high-temperature extrusion channel connects the inner and outer dies. The inner die is fixed within the extruder head, while the radial position of the outer die relative to the inner die is adjustable. During production, misalignment between the inner and outer dies can lead to uneven extruded cable insulation thickness, known as eccentricity, which negatively impacts the cable's insulation performance.

[0003] Currently, one method to ensure the coaxiality of the inner and outer dies of an extruder is to use an eccentric extrusion die that does not require adjustment. This mainly involves ensuring the coaxiality of the inner and outer dies during the design, manufacturing, and assembly stages of the mechanism. This method is simple in structure and easy to use, but its main problem is that it requires very high precision in the manufacturing and assembly of related devices, and once eccentricity occurs due to various reasons, it is difficult to adjust and correct.

[0004] Another major category of methods to ensure the eccentricity error of the inner and outer molds of an extruder is to use a mechanism to adjust the eccentricity. Currently, these methods often involve setting up a set of opposing top pressure adjustments in two radial directions perpendicular to each other at the extruder head, and many of them use screws to directly press the outer mold for adjustment. The advantages of this method are simplicity and ease of use, but the following problems exist: (1) Since the positioning and clamping mechanisms are integrated, and due to the influence of the opposing clamping method at both ends, the positioning screw on one side will change slightly and be uncertain due to the elastic deformation of the material, especially the contact stiffness of the thread mating surface, as the clamping force of the screw on the other side changes continuously; (2) The clamping screws on both sides that continuously bear large clamping forces are prone to material creep and material loosening in the high temperature environment of the extruder head during long-term operation, which will continuously weaken the clamping force of the clamping screws on both sides and affect their positioning accuracy. This is an important reason for the common phenomenon of unreliable eccentric adjustment of the extruder; (3) The eccentricity of the extruder head is not adjusted directly by the thread mating of the screws, and the adjustment accuracy is not high; (4) If an automatic eccentric adjustment mechanism is used, the above method requires four sets of adjustment drive mechanisms, which increases the cost of the device and the complexity of control. Utility Model Content

[0005] To facilitate and accurately adjust the eccentricity of the inner and outer dies of an extruder, this application provides a precise eccentricity adjustment device for an extruder.

[0006] The precise alignment device for an extruder provided in this application adopts the following technical solution:

[0007] A precision alignment device for an extruder includes two sets of alignment positioning mechanisms and two sets of alignment clamping mechanisms arranged in a cross-shaped orthogonal configuration at one end of the machine base. Each set of alignment positioning mechanisms and alignment clamping mechanisms is arranged opposite to each other along the radial direction of the machine base.

[0008] The offset positioning mechanism includes a first abutting member that passes through the machine base radially, one end of the first abutting member abutting against the outer side of the outer mold, and a driving assembly for driving the first abutting member to slide radially along the machine base.

[0009] The offset clamping mechanism includes a second abutment that extends radially through the machine base. The machine base is provided with an elastic component for driving the second abutment to elastically press against the outer side of the outer mold. The machine base is also provided with a locking component for locking the position of the second abutment.

[0010] Furthermore, a wedge mounting base is fixedly provided on the base, and an outer wedge strip is fixedly connected to the wedge mounting base. The driving assembly includes an inner wedge strip slidably disposed on the wedge mounting base. The inclined surface of the outer wedge strip abuts against the inclined surface of the inner wedge strip. The side of the inner wedge strip opposite to its own inclined surface abuts against the first abutting member. The driving assembly also includes a driving member for driving the inner wedge strip to slide along the axial direction of the base.

[0011] Furthermore, the driving component includes a positioning adjustment screw threaded to the wedge mounting base, the positioning adjustment screw being arranged axially along the base, and its end abutting against the large end of the inner wedge bar.

[0012] Furthermore, a first elastic element is fixedly provided on the wedge mounting base, and the first elastic element abuts against the small end of the inner wedge strip.

[0013] When the positioning and adjusting screw is tightened, the positioning and adjusting screw pushes the inner inclined wedge to move axially along the machine base and overcomes the elastic force of the first elastic element. The inner inclined wedge slides relative to the outer inclined wedge and pushes the inner inclined wedge to move radially along the machine base. The inner inclined wedge pushes the first abutting member, and the first abutting member in turn pushes the outer mold to move radially along the machine base.

[0014] When the positioning and adjusting screws are loosened, the elastic force of the first elastic element drives the inner inclined wedge to move along the axial direction of the machine base. At this time, under the action of the elastic component, the second abutting member pushes the outer mold, thereby making the first abutting member always abut against the inner inclined wedge, and the inner inclined wedge always abut against the outer inclined wedge.

[0015] Furthermore, the base is provided with a measuring component for measuring the displacement of the inner inclined wedge.

[0016] Furthermore, the measuring assembly includes a dial indicator fixedly mounted on the base, and a displacement transmission rod is fixedly connected to the inner inclined wedge, with one end of the displacement transmission rod abutting against the probe of the dial indicator.

[0017] When the inner inclined wedge moves along the axial direction of the machine base, the displacement transmission rod moves synchronously with the inner inclined wedge. After the dial indicator measures the displacement value, combined with the inclination angle of the inclined surface of the inner inclined wedge, the radial displacement value of the inner inclined wedge along the machine base can be calculated, which is the displacement of the first abutting part that pushes the outer mold to move.

[0018] Furthermore, the positioning and adjusting screw is threadedly connected to a first anti-loosening nut, which abuts against the wedge mounting base.

[0019] When the first anti-loosening nut is tightened so that it abuts against the wedge mounting seat, the positioning and adjusting screw can be locked to prevent loosening.

[0020] Furthermore, the locking assembly includes a locking screw threaded to the base, the locking screw being arranged axially along the base, and its end abutting against one side of the second abutment.

[0021] Tighten the locking screws so that they press against one side of the second abutment, thereby locking the position of the second abutment and thus locking the position of the outer mold.

[0022] Furthermore, the elastic component includes a clamping screw threaded to the base, the clamping screw being coaxially arranged with the second abutment member, and the elastic component further includes a second elastic member disposed between the clamping screw and the second abutment member.

[0023] Applying a constant preload to the second abutment by the second elastic element helps to avoid the problem of creep and loosening that easily occur in high-temperature environments when the extruder uses traditional screws for bidirectional clamping, thus affecting the reliability of clamping and positioning.

[0024] Furthermore, the clamping screw is threaded with a second anti-loosening nut, which abuts against the machine base.

[0025] When the second anti-loosening nut is tightened so that it abuts against the machine base, the clamping screw can be locked to prevent loosening.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. This application adopts a screw adjustment plus wedge bar transmission adjustment method, and uses a dial indicator to display the adjustment amount in real time and accurately, so that the eccentricity positioning adjustment is precise and reliable;

[0028] 2. The alignment positioning mechanism and the alignment clamping mechanism in this application both use compression springs in conjunction with screws for adjustment. The method of applying constant pre-pressure with compression springs to tighten the positioning mechanism ensures the reliable operation of the alignment positioning mechanism and the alignment clamping mechanism. This helps to improve the problem that traditional extruders using screws for bidirectional clamping are prone to creep and loosening in high-temperature environments, thus affecting the reliability of clamping and positioning.

[0029] 3. The two sets of eccentricity adjustment positioning mechanisms and eccentricity adjustment clamping mechanisms in this application are independent of each other. Compared with the traditional extruder eccentricity adjustment device, the positioning adjustment drive unit can be reduced by half. Eccentricity adjustment in one direction will not affect the eccentricity accuracy in another direction, making this device easy to quickly, accurately and economically realize the automatic adjustment of the extruder eccentricity. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural diagram of an embodiment of this application.

[0031] Reference numerals in the attached drawings: 1. Machine base; 2. Inner mold; 3. Outer mold; 4. Screw cap; 5. Alignment and positioning mechanism; 51. Wedge mounting base; 52. Outer wedge; 53. Inner wedge; 54. First compression spring; 55. Positioning adjustment screw; 56. Transmission vertical shaft; 57. Displacement transmission rod; 58. Dial indicator base; 59. Dial indicator; 510. First anti-loosening nut; 6. Alignment clamping mechanism; 61. Pin; 62. Second compression spring; 63. Clamping screw; 64. Second anti-loosening nut; 65. Locking screw. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0033] This application discloses a precise alignment device for an extruder. (Refer to...) Figure 1 The extruder head includes a base 1, with an inner mold 2 fixedly installed inside the base 1. An outer mold 3 is fitted over the inner mold 2. The inner mold 2 is hollow and carries the cable core to be extruded. The gap between the inner mold 2 and the outer mold 3 is a high-temperature extrusion channel. A screw cap 4 is threadedly connected to the end of the base 1. An embodiment of this application provides a precise alignment device for an extruder used to adjust the radial position of the outer mold 3, thereby adjusting the concentricity of the inner mold 2 and the outer mold 3.

[0034] Reference Figure 1 The extruder's precision alignment device includes two sets of alignment positioning mechanisms 5 and two sets of alignment clamping mechanisms 6 arranged in a cross-shaped orthogonal configuration at one end of the machine base 1. Each set of alignment positioning mechanisms 5 and alignment clamping mechanisms 6 is arranged radially opposite to each other along the machine base 1. Typically, one set of alignment positioning mechanisms 5 and alignment clamping mechanisms 6 is arranged horizontally, while the other set is arranged vertically. Figure 1 The display shows a set of vertical alignment positioning mechanism 5 and alignment clamping mechanism 6.

[0035] Reference Figure 1 The offset positioning mechanism 5 includes a first abutting member that runs radially through the base 1. The first abutting member is a cylindrical transmission vertical shaft 56. One end of the transmission vertical shaft 56 abuts against the outer side of the outer mold 3. The base 1 is provided with a drive assembly for driving the transmission vertical shaft 56 to slide radially along the base 1.

[0036] Specifically, refer to Figure 1 A wedge mounting base 51 is fixedly mounted on the base 1, and an outer wedge strip 52 is fixedly connected to the wedge mounting base 51. The drive assembly includes an inner wedge strip 53 slidably mounted on the wedge mounting base 51, with one large end and one small end. The inclined surface of the outer wedge strip 52 abuts against the inclined surface of the inner wedge strip 53, and the inclination of both inclined surfaces is the same. The side of the inner wedge strip 53 opposite to its own inclined surface is a plane parallel to the axial direction of the base 1, and this plane abuts against one end of the transmission vertical shaft 56. The drive assembly also includes a drive member for driving the inner wedge strip 53 to slide along the axial direction of the base 1.

[0037] Reference Figure 1 The driving component includes a positioning and adjusting screw 55 threadedly connected to the wedge mounting base 51. The positioning and adjusting screw 55 is axially arranged along the base 1, and its end abuts against the large end of the inner wedge bar 53. A first elastic element, which is a first compression spring 54, is fixedly mounted on the wedge mounting base 51 and abuts against the small end of the inner wedge bar 53. To lock the positioning and adjusting screw 55, a first anti-loosening nut 510 is also threadedly connected to the positioning and adjusting screw 55.

[0038] Furthermore, referring to Figure 1 A dial indicator base 58 is fixedly installed on the base 1, and a dial indicator 59 is installed on the dial indicator base 58; a displacement transmission rod 57 is fixedly connected to the inner inclined wedge 53, and one end of the displacement transmission rod 57 abuts against the probe of the dial indicator 59.

[0039] Reference Figure 1 The offset clamping mechanism 6 includes a second abutment that extends radially through the base 1. The second abutment is a cylindrical pin 61. The base 1 is provided with an elastic component for driving the pin 61 to elastically abut against the outside of the outer mold 3. The base 1 is also provided with a locking component for locking the position of the pin 61.

[0040] Specifically, refer to Figure 1The elastic component includes a clamping screw 63 threadedly connected to the base 1. The clamping screw 63 and the pin 61 are coaxially arranged. The elastic component also includes a second elastic element disposed between the clamping screw 63 and the pin 61. The second elastic element is a second compression spring 62. In order to lock the clamping screw 63, the clamping screw 63 is also threadedly connected to a second anti-loosening nut 64.

[0041] Reference Figure 1 The locking assembly includes a locking screw 65 threaded to the base 1, the locking screw 65 being arranged axially along the base 1, and its end abutting against one side of the pin 61.

[0042] To ensure that eccentric adjustment in one direction does not affect the eccentricity accuracy in another direction perpendicular to that direction, a small plane is provided at the position where the outer mold 3 contacts the transmission vertical shaft 56, and a small plane is also provided at the position where the outer mold 3 contacts the pin 61. That is, four small planes are evenly distributed around the outer circumference of the outer mold 3.

[0043] The following describes the method of using a precision alignment device for an extruder according to an embodiment of this application:

[0044] First, using a concentricity measuring instrument, the required horizontal and vertical displacements of the outer mold 3 are determined. and Then, the concentricity of the inner mold 2 and the outer mold 3 is adjusted using a precision alignment device for an extruder according to an embodiment of this application. The specific method is as follows:

[0045] like Figure 1 As shown, before adjustment, first loosen the first anti-loosening nut 510 in the two sets of offset positioning mechanisms 5, and loosen the second anti-loosening nut 64, clamping screw 63 and locking screw 65 in the two sets of offset clamping mechanisms 6.

[0046] If we want to adjust the vertical downward eccentricity of the outer mold 3 relative to the inner mold 2... Tighten the positioning and adjusting screw 55 gradually, push the inner inclined wedge 53 to move to the left along the axial direction of the machine base 1, and overcome the elastic force of the first compression spring 54. The inner inclined wedge 53 and the outer inclined wedge 52 slide relative to each other. Under the action of the inclined surfaces of the inner inclined wedge 53 and the outer inclined wedge 52, the inner inclined wedge 53 moves down along the radial direction of the machine base 1. The inner inclined wedge 53 pushes the transmission vertical shaft 56, and the transmission vertical shaft 56 in turn pushes the outer mold 3 down.

[0047] During the adjustment process, observe the change in the reading of dial indicator 59 driven by displacement transmission rod 57. Δ Assuming that the inclination of both the inner and outer inclined wedges 53 and 52 in this embodiment is 1:20, then when the change in the dial gauge 59 reading is observed... Δ =20 At this time, stop tightening the positioning adjusting screw 55 and tighten the first anti-loosening nut 510 in time. At this time, the inner inclined wedge 53 has accurately shifted 20 mm to the left. At the same time, due to the effect of the inclined plane, there is also a relative displacement in the vertical direction downwards. The displacement The eccentricity of the outer mold 3 is adjusted by transmitting the data to the outer mold 3 via the vertical shaft 56, thus completing the adjustment of the eccentricity of the outer mold 3 in the vertically downward direction.

[0048] If we want to adjust the vertical upward eccentricity of the outer mold 3 relative to the inner mold 2... The operation method is the same as the above process, except that the turning direction of the positioning adjustment screw 55 needs to be changed to loosen. At this time, under the elastic force of the first compression spring 54, the right end face of the inner inclined wedge 53 is always pressed against the positioning adjustment screw 55 and moves to the right accordingly.

[0049] Meanwhile, the clamping screw 63 below the extruder head always maintains a large pre-pressure against the second compression spring 62. Under the elastic force of the second compression spring 62, the pin 61 that abuts against the second compression spring 62 pushes the outer mold 3 upward, and the outer mold 3 pushes the transmission vertical shaft 56 upward, so that the upper end face of the transmission vertical shaft 56 always abuts against the lower end face of the inner inclined wedge 53 and continues to exert upward force to ensure that the inclined surfaces of the inner inclined wedge 53 and the outer inclined wedge 52 are always abutted.

[0050] The inner wedge 53 is precisely adjusted to the right by reading the change in value using dial indicator 59. Δ =20 At the same time, the inner inclined wedge 53 also generated upwards. The displacement of the outer mold 3 thus completes the upward eccentricity in the vertical direction. Adjustment.

[0051] If it is necessary to adjust the eccentricity of the outer mold 3 relative to the inner mold 2 in the horizontal direction, it can be achieved by adjusting a pair of eccentricity positioning mechanisms 5 and eccentricity clamping mechanisms 6 in the horizontal direction of the extruder head, in the same way as the vertical adjustment steps described above.

[0052] Once the eccentricity of the outer mold 3 relative to the inner mold 2 is adjusted to the correct position, tighten the clamping screws 63 in the two sets of eccentricity adjustment clamping mechanisms 6 with a certain preload, then lock the second anti-loosening nuts 64 on the two clamping screws 63, and finally lock the locking screws 65 in the two sets of eccentricity adjustment clamping mechanisms 6 respectively.

[0053] In one feasible implementation, the positioning adjustment screw 55 can be manually turned. In another feasible implementation, the positioning adjustment screw 55 can be driven by a stepper motor or a servo motor, and the dial indicator 59 can be replaced by an automatic displacement detection and feedback unit. Based on the displacement offset fed back by the automatic displacement detection and feedback unit, the drive motor driving the positioning adjustment screw 55 in that direction can be automatically controlled, thereby achieving automatic adjustment of the eccentricity.

[0054] It should be noted that when the eccentricity adjustment is small, the slight offset of the outer mold 3 will not significantly change the preload of the second compression spring 62. In this case, thanks to the continuous and stable preload of the two second compression springs 62 in the vertical and horizontal directions, when adjusting the eccentricity in one direction of the extruder, it is not necessary to loosen the corresponding clamping screw 63 in that direction, nor is it necessary to loosen the eccentricity adjustment positioning mechanism 5 and the eccentricity adjustment clamping mechanism 6 in the other direction perpendicular to that direction. Eccentricity adjustment in one direction will not affect the eccentricity accuracy in the other direction, enabling this device to quickly, simply, and accurately adjust the eccentricity of the extruder.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A precision alignment device for an extruder, characterized in that: It includes two sets of alignment and positioning mechanisms and two sets of alignment and clamping mechanisms arranged in a cross-shaped orthogonal arrangement at one end of the machine base. Each set of alignment and positioning mechanisms and alignment and clamping mechanisms are arranged opposite each other along the radial direction of the machine base. The offset positioning mechanism includes a first abutting member that passes through the machine base radially, one end of the first abutting member abutting against the outer side of the outer mold, and a driving assembly for driving the first abutting member to slide radially along the machine base. The offset clamping mechanism includes a second abutment that extends radially through the machine base. The machine base is provided with an elastic component for driving the second abutment to elastically press against the outer side of the outer mold. The machine base is also provided with a locking component for locking the position of the second abutment.

2. The precise alignment device for an extruder according to claim 1, characterized in that: A wedge mounting base is fixedly provided on the base, and an outer wedge strip is fixedly connected to the wedge mounting base. The driving assembly includes an inner wedge strip slidably disposed on the wedge mounting base. The inclined surface of the outer wedge strip abuts against the inclined surface of the inner wedge strip. The side of the inner wedge strip opposite to its own inclined surface abuts against the first abutting member. The driving assembly also includes a driving member for driving the inner wedge strip to slide along the axial direction of the base.

3. The extruder precision alignment device according to claim 2, characterized in that: The driving component includes a positioning and adjusting screw threaded to the wedge mounting base. The positioning and adjusting screw is arranged along the axial direction of the base, and its end abuts against the large end of the inner wedge bar.

4. The precise alignment device for an extruder according to claim 3, characterized in that: A first elastic element is fixedly installed on the wedge mounting base, and the first elastic element abuts against the small end of the inner wedge strip.

5. The extruder precision alignment device according to claim 2, characterized in that: The base is equipped with a measuring component for measuring the displacement of the inner inclined wedge.

6. The extruder precision alignment device according to claim 5, characterized in that: The measuring assembly includes a dial indicator fixedly mounted on the base, and a displacement transmission rod is fixedly connected to the inner inclined wedge, with one end of the displacement transmission rod abutting against the probe of the dial indicator.

7. The precise alignment device for an extruder according to claim 3, characterized in that: The positioning and adjusting screw is threaded with a first anti-loosening nut, which abuts against the wedge mounting base.

8. The precise alignment device for an extruder according to claim 1, characterized in that: The locking assembly includes a locking screw threaded to the base, the locking screw being arranged axially along the base, and its end abutting against one side of the second abutment.

9. The precise alignment device for an extruder according to claim 8, characterized in that: The elastic component includes a clamping screw threaded to the base, the clamping screw being coaxially arranged with the second abutment member, and the elastic component further includes a second elastic member disposed between the clamping screw and the second abutment member.

10. The precise alignment device for an extruder according to claim 9, characterized in that: The clamping screw is threaded with a second anti-loosening nut, which abuts against the machine base.

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