Vacuumizing device for cable plastic extruding machine

Abstract

The utility model relates to a vacuumizing device for a cable extruding machine, and belongs to the technical field of cable extruding machines, the vacuumizing device comprises a vacuum pump and a connecting seat connected with the vacuum pump, the connecting seat comprises a front end and a rear end, the front end and the rear end are open, and a cable passing channel for a cable to penetrate through is formed in the connecting line direction of the front end and the rear end; the rear end of the connecting seat is detachably connected with a machine head of the plastic extruding machine; the vacuum pump communicates with the interior of the wire passing channel and the communicating position is located between the front end and the rear end. Sealing pieces, a positioning ring and a driving assembly are arranged on the connecting base, the positioning ring is fixed to the front end, the center of the positioning ring is located on a cable conveying path, the sealing pieces are slidably arranged on the positioning ring and slide in a reciprocating mode in the position close to or away from the center of the positioning ring, the multiple sealing pieces are arranged, and the adjacent sealing pieces are arranged in the circumferential direction of the positioning ring; the driving assembly is used for driving all the sealing pieces to slide relative to the positioning ring at the same time. The cable extrusion molding device has the effects of reducing redundant air in the cable extrusion molding process and improving the cable glue wrapping quality.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of cable extruding machines, in particular to a vacuum pumping device for a cable extruding machine. BACKGROUND

[0002] Currently, the sheath of a power cable is usually made of non-metallic plastic material. In the process of extruding the plastic sheath, most of the current extruding machines adopt an extruding tube type mold, and extruding molding is one of the main methods for manufacturing the external insulation sheath of a cable.

[0003] In actual operation, the diameter of the cable core is usually smaller than the extruding hole diameter of the extruding mold, and the process protects the cable by wrapping the molten plastic on the outside of the cable.

[0004] In the extruding molding process, the molten plastic is prone to leaving some air on the outside of the cable, which causes defects such as air holes and gaps in the cable wrapping. CONTENT OF THE INVENTION

[0005] In order to reduce the excess air in the cable extruding process and improve the quality of the cable wrapping, the application provides a vacuum pumping device for a cable extruding machine.

[0006] The vacuum pumping device for the cable extruding machine provided by the application adopts the following technical scheme:

[0007] A vacuum pumping device for a cable extruding machine comprises a vacuum pump and a connecting seat connected with the vacuum pump, the connecting seat comprises a front end and a rear end, both the front end and the rear end are open and are provided with a wire passing channel for the cable to pass through along the line connecting direction, and the rear end of the connecting seat is used for detachable connection with the head of the extruding machine; the vacuum pump is in communication with the inside of the wire passing channel, and the communication part is located between the front end and the rear end; a sealing piece, a positioning ring and a driving assembly are arranged on the connecting seat, the positioning ring is fixed at the front end and is located on the transportation path of the cable at the center, the sealing piece is slidingly arranged on the positioning ring and reciprocally slides towards or away from the center of the positioning ring, a plurality of sealing pieces are arranged, adjacent sealing pieces are arranged in the circumferential direction of the positioning ring, and the driving assembly is used for driving all the sealing pieces to slide relative to the positioning ring.

[0008] By adopting the above technical scheme, in the cable extruding process, the cable passes through the wire passing channel of the connecting seat. When it is necessary to pump the extruding area, the vacuum pump is started, the vacuum pump pumps the air in the wire passing channel through the communication part, and the possibility of air remaining when the molten plastic wraps the cable is reduced. The sealing piece slides on the positioning ring, the position of the sealing piece can be adjusted by the driving assembly according to the diameter of the cable, the sealing piece is attached to the surface of the cable, a relatively sealed space is formed, external air is further prevented from entering, the vacuum pumping effect is improved, and the occurrence of air holes and gaps in the cable wrapping is effectively reduced, and the quality of the cable wrapping is improved.

[0009] Optionally, the adjacent sealing pieces are staggered and arranged in front and back along the cable transportation direction, and the adjacent sealing pieces always have overlapping areas.

[0010] By adopting the above technical scheme, the staggered arrangement can always maintain good sealing effect when the sealing pieces are adjusted to fit the cable, even if there is slight shaking during cable transportation. Air is prevented from entering the gap between the sealing pieces due to cable shaking. Since the cable is mostly circular, the multiple sealing pieces move towards the cable and are finally pressed against the outer wall of the cable, thereby sealing the cable circumferential wall as much as possible. The staggered arrangement provides overlapping space. The sealing performance of the extrusion area is further improved, the vacuum extraction effect is enhanced, and the cable coating quality is guaranteed.

[0011] Optionally, the drive assembly includes a drive ring, a cross rod, and a motor. The positioning ring has a long slot, which is arranged along the diameter of the positioning ring. The drive ring has an arc-shaped hole, which is arranged in an arc shape along the edge of the drive ring and has a starting point and an ending point located at different diameters of the drive ring. The drive ring is rotationally arranged on the positioning ring with the center points collinear, and the drive ring is tightly arranged on the positioning ring. One end of the cross rod penetrates the arc-shaped hole and is slidingly arranged in the long slot. The cross rod slides along the length direction of the arc-shaped hole and the long slot. The other end of the cross rod is connected with the sealing piece. The motor is fixed on the outer wall of the connecting seat to drive the rotation of the drive ring. The number of the cross rod, the long slot, and the arc-shaped hole is corresponding to the number of the sealing pieces.

[0012] By adopting the above technical scheme, the motor drives the rotation of the drive ring, and the arc-shaped hole on the drive ring guides the sliding of the cross rod in the long slot of the positioning ring. Due to the special arc shape of the arc-shaped hole, the cross rod can push the sealing piece to reciprocally slide along the radius direction of the positioning ring to approach or move away from the center. The position of the sealing piece can be accurately controlled by the forward and reverse rotation of the motor to adapt to the sealing needs of cables with different diameters. Meanwhile, multiple sealing pieces can be adjusted synchronously, which is simple to operate and improves the applicability and working efficiency of the device.

[0013] Optionally, a vertical rod is arranged between the cross rod and the sealing piece. One end of the vertical rod is fixed to the end of the cross rod, and the other end is fixed to the sealing piece. A sensor for monitoring the pressure at the contact between the sealing piece and the cable is arranged on the vertical rod.

[0014] By adopting the above technical scheme, the sensor can monitor the pressure at the contact between the sealing piece and the cable in real time. When the pressure is too large, the rotation angle of the motor can be adjusted to reduce the pressure of the sealing piece on the cable to prevent damage to the surface of the cable. When the pressure is too small, the motor can be adjusted to increase the contact pressure of the sealing piece on the cable to ensure good sealing effect. Thus, the sealing performance is ensured, the cable is protected from damage, and the quality of cable production is improved.

[0015] Optionally, a gear is fixed on the output end of the motor, and a gear ring is fixed on the circumferential outer wall of the driving ring, and the gear and the gear ring are engaged.

[0016] By adopting the above technical scheme, the gear on the output end of the motor is engaged with the gear ring on the driving ring, which can stably transmit the rotating motion of the motor to the driving ring, ensuring the stability and accuracy of the rotation of the driving ring. Compared with direct driving, this gear transmission mode has high transmission accuracy and torque transmission capacity, which can more accurately control the rotation angle of the driving ring, thereby realizing accurate adjustment of the position of the sealing sheet and improving the adaptability of the device to different specifications of cables.

[0017] Optionally, the wire passage is gradually tapered in the direction from the front end to the rear end.

[0018] By adopting the above technical scheme, the gradually tapered wire passage can guide the cable to pass through the connecting seat more smoothly, and at the same time, it is helpful to make the airflow better converge towards the vacuum pump during the vacuumizing process, thereby improving the air extraction efficiency. Moreover, when the molten plastic wraps the cable, the tapered structure can guide and constrain the plastic to some extent, so that the plastic can be more uniformly wrapped on the cable, further improving the quality of cable coating.

[0019] Optionally, a connecting pipe is arranged on the connecting seat, one end of the connecting pipe is connected with the vacuum pump, and the other end penetrates into the wire passage and the penetration position is close to the rear end.

[0020] By adopting the above technical scheme, the connecting pipe communicates the vacuum pump with the wire passage, and the penetration position is close to the rear end, so that the vacuum pump can more effectively extract the air in the area near the head of the extruder, because this area is a key area for wrapping the cable with molten plastic, and residual air can easily cause defects in cable coating.

[0021] Optionally, the sealing sheet is made of rubber material.

[0022] By adopting the above technical scheme, the rubber material has good elasticity and flexibility, which can tightly fit the surface of the cable and form a reliable seal.

[0023] In summary, the present application has the following at least one beneficial technical effect:

[0024] 1. By means of the adjustable sealing sheet on the connecting seat and the driving assembly, the position of the sealing sheet can be flexibly adjusted according to the diameter of the cable, a relatively sealed space is formed, and the vacuum pump is used to extract air from the extrusion area, which effectively reduces the residual air during cable coating and significantly improves the quality of cable coating.

[0025] 2. The driving assembly adopts a structure composed of a motor, a driving ring, a cross rod and the like, and rotates the driving ring by the motor, so as to realize synchronous and accurate control of the plurality of sealing pieces by virtue of the design of the arc-shaped hole and the long hole, and greatly improve the applicability and working efficiency of the device to different specifications of cables.

[0026] 3. The connecting seat is provided with the butt joint pipe, and the butt joint pipe penetrates to the vicinity of the rear end of the wire passing channel, so that the vacuum pump can accurately extract air in the key area near the head of the extruding machine, and improve the pertinence of vacuum extraction; the wire passing channel is designed in a gradually closed manner, which is beneficial to guiding the cable to pass smoothly, gathering air flow to improve the air extraction efficiency, and assisting the plastic to uniformly wrap the cable, and comprehensively ensures the cable wrapping quality. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of the sealing piece of the present application abutting against the outer wall of the cable;

[0028] Figure 2 is an exploded view of the connecting portion of the positioning ring and the driving ring;

[0029] Figure 3 is a vertical sectional view of the embodiment of the present application.

[0030] In the figure, 1 is a connecting seat; 11 is a front end; 12 is a rear end; 13 is a wire passing channel; 2 is a sealing piece; 3 is a positioning ring; 31 is a long hole; 4 is a driving assembly; 41 is a driving ring; 411 is an arc-shaped hole; 412 is a gear ring; 42 is a cross rod; 43 is a motor; 5 is a vertical rod; 6 is a sensor; 7 is a gear; 8 is a butt joint pipe. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying drawings Figures 1-3 The present application will be further described in detail.

[0032] The embodiment of the present application discloses a vacuum extraction device for a cable extruding machine.

[0033] Reference Figure 1 , Figure 2 and Figure 3 A vacuum extraction device for a cable extruding machine comprises a connecting seat 1 and a vacuum pump, the connecting seat 1 comprises a front end 11 and a rear end 12, the front end 11 and the rear end 12 are both open and a wire passing channel 13 is arranged in the connecting seat 1, and the wire passing channel 13 is communicated with the front end 11 and the rear end 12. A butt joint pipe 8 is arranged on the connecting seat 1, one end of the butt joint pipe 8 is connected with the vacuum pump, and the other end is communicated with the wire passing channel 13 and the communicated position is close to the rear end 12. The rear end 12 of the connecting seat 1 is threadedly connected with the head of the extruding machine. In the embodiment, the head of the extruding machine and the vacuum pump are not shown in the drawings and are both prior art.

[0034] Reference Figure 3, the cable passes through the front end 11 and the wire passage 13 from the rear end 12 to the head of the extruder, and the whole direction is the transportation direction of the cable. The wire passage 13 is gradually tapered along the direction from the front end 11 to the rear end 12.

[0035] With reference to Figure 1 and Figure 2 , the connecting seat 1 is provided with sealing pieces 2, a positioning ring 3 and a driving assembly 4. The positioning ring 3 is fixed at the front end 11 and is located on the transportation path of the cable at the center. The sealing pieces 2 are slidingly arranged on the positioning ring 3 and reciprocally slide towards or away from the center of the positioning ring 3. The sealing pieces 2 are provided in plurality, and adjacent sealing pieces 2 are arranged in the circumferential direction of the positioning ring 3. The positioning ring 3 is provided with a long hole 31, which is arranged in the diameter direction of the positioning ring 3, and the number of long holes 31 is the same as the number of sealing pieces 2. Adjacent sealing pieces 2 are staggered and arranged in front of and behind each other in the cable transportation direction, and there is always an overlapping area between adjacent sealing pieces 2 in use. In fact, two oppositely arranged sealing pieces 2 can seal the gap between the front end 11 and the outer wall of the cable in cooperation with the positioning ring 3. The two opposite sealing pieces 2 abut against the outer wall of the cable, the sealing pieces 2 are deformed to fit the outer wall of the cable, and the two sealing pieces 2 also cover the gap between the cable and the positioning ring 3. In the embodiment, the staggered arrangement of four sealing pieces 2 has the effect of double sealing.

[0036] With reference to Figure 1 and Figure 2 , the driving assembly 4 includes a driving ring 41, a cross rod 42 and a motor 43. The driving ring 41 is provided with an arc-shaped hole 411, which is arranged in an arc shape towards the edge of the driving ring 41 and the starting point and the ending point of the arc-shaped hole 411 are located on different diameters of the driving ring 41. The driving ring 41 is rotationally arranged on the positioning ring 3 with the center points of the two being collinear, and the driving ring 41 is arranged closely against the positioning ring 3. The driving ring 41 is located on the side of the positioning ring 3 away from the front end 11. One end of the cross rod 42 penetrates through the arc-shaped hole 411 and is slidingly arranged in the long hole 31. The cross rod 42 simultaneously slides along the length direction of the arc-shaped hole 411 and the long hole 31, that is, the cross rod 42 cannot be separated from the long hole 31. The other end of the cross rod 42 is fixed with a vertical rod 5, and the vertical rod 5 and the cross rod 42 are perpendicular, that is, the vertical rod 5 is arranged in the vertical direction. The vertical rod 5 is connected with the sealing piece 2 at the bottom end. The vertical rod 5 is provided with a sensor 6 for monitoring the pressure of the contact between the sealing piece 2 and the cable. The inner diameter and the outer diameter of the driving ring 41 and the positioning ring 3 are the same.

[0037] With reference to Figure 1 and Figure 2The motor 43 is fixed on the outer wall of the connecting seat 1, the output end of the motor 43 is fixed with a gear 7, the circumferential outer wall of the driving ring 41 is fixed with a gear ring 412, and the gear 7 and the gear ring 412 are in meshing connection. The motor 43 and the sensor 6 are electrically connected, the sensor 6 can adopt a pressure sensor 6 to directly measure the pressure at the contact position of the sealing piece 2 and the cable, or can adopt a displacement sensor 6 to obtain the pressure at the contact position of the sealing piece 2 and the cable through calculation and conversion, and the mode is not unique, and too many examples are not given. A controller can be arranged between the sensor 6 and the motor 43, the sensor 6 transmits the detected pressure signal, the controller receives the pressure signal and transmits a control signal to control the start and stop of the motor 43, so that when the pressure is too large, the rotation angle of the motor 43 can be adjusted to reduce the pressure of the sealing piece 2 on the cable, and damage to the surface of the cable is prevented; when the pressure is too small, the motor 43 can be adjusted appropriately to increase the contact pressure of the sealing piece 2 on the cable, and good sealing effect is ensured.

[0038] Reference Figure 1 and Figure 2 The number of the cross rods 42, the vertical rods 5 and the arc-shaped holes 411 is arranged corresponding to the number of the sealing pieces 2. The sealing piece 2 is made of rubber material.

[0039] The implementation principle of the vacuumizing device for the cable extruding machine in the embodiment of the application is as follows: in the cable extruding process, the cable passes through the wire passing channel 13 of the connecting seat 1. When it is necessary to vacuumize the extruding area, the vacuum pump is started, the vacuum pump extracts air in the wire passing channel 13 through the communication position, and the possibility of residual air when the molten plastic wraps the cable is reduced. The sealing piece 2 slides on the positioning ring 3, the position of the sealing piece 2 can be adjusted through the driving assembly 4 according to the diameter of the cable, so that the sealing piece 2 is attached to the surface of the cable, a relatively sealed space is formed, external air is further prevented from entering, the vacuumizing effect is improved, the air holes and gaps in the cable rubber coating are effectively reduced, and the quality of the cable rubber coating is improved.

[0040] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A vacuum extraction device for cable extrusion machines, comprising a vacuum pump, characterized in that: The application also comprises a connecting seat (1) connected with the vacuum pump, the connecting seat (1) comprising a front end (11) and a rear end (12), both of which are open and provided with a wire passing channel (13) for cable penetration along the connecting line direction of the two ends, the rear end (12) of the connecting seat (1) being used for detachable connection with the head of the extruding machine; the vacuum pump is in communication with the inside of the wire passing channel (13) and the communication position is between the front end (11) and the rear end (12); the connecting seat (1) is provided with sealing sheets (2), a positioning ring (3) and a driving assembly (4), the positioning ring (3) is fixed at the front end (11) and the center position is on the cable transportation path, the sealing sheets (2) are slidingly arranged on the positioning ring (3) and reciprocally slide along the center position of the positioning ring (3), the sealing sheets (2) are provided with a plurality of adjacent sealing sheets (2) arranged along the circumference of the positioning ring (3), and the driving assembly (4) is used for driving all the sealing sheets (2) to slide relative to the positioning ring (3) at the same time.

2. A vacuum-pumping device for cable extrusion machines according to claim 1, characterized in that: The adjacent sealing sheets (2) are staggered and arranged in front and back along the cable transportation direction, and there is always an overlapping area between the adjacent sealing sheets (2).

3. A vacuum-pumping device for cable extrusion machines according to claim 2, characterized in that: The driving assembly (4) comprises a driving ring (41), a cross rod (42) and a motor (43), the positioning ring (3) is provided with a long hole (31) which is provided along the diameter direction of the positioning ring (3); the driving ring (41) is provided with an arc-shaped hole (411) which is provided in an arc shape along the direction close to the edge of the driving ring (41) and the starting point and the end point of the arc-shaped hole (411) are located on different diameters of the driving ring (41); the driving ring (41) is rotationally arranged on the positioning ring (3) and the center points of the two are collinear, the driving ring (41) is arranged close to the positioning ring (3), one end of the cross rod (42) penetrates through the arc-shaped hole (411) and is slidingly arranged in the long hole (31), the cross rod (42) simultaneously slides along the length direction of the arc-shaped hole (411) and the long hole (31), the other end of the cross rod (42) is connected with the sealing sheet (2); the motor (43) is fixed on the outer wall of the connecting seat (1) and is used for driving the driving ring (41) to rotate; the number of the cross rod (42), the long hole (31) and the arc-shaped hole (411) is corresponding to the number of the sealing sheet (2).

4. A vacuum pump for cable extrusion machines according to claim 3, characterized in that: A vertical rod (5) is arranged between the cross rod (42) and the sealing sheet (2), one end of the vertical rod (5) is fixed with the end of the cross rod (42), the other end is fixed with the sealing sheet (2), and the vertical rod (5) is provided with a sensor (6) for monitoring the pressure of the contact position between the sealing sheet (2) and the cable.

5. A vacuum-pumping device for cable extrusion machines according to claim 3, characterized in that: A gear (7) is fixed on the output end of the motor (43), and a gear ring (412) is fixed on the circumferential outer wall of the driving ring (41), the gear (7) and the gear ring (412) are engaged.

6. A vacuum-pumping device for cable extrusion machines according to claim 1, characterized in that: In the connecting line direction from the front end (11) to the rear end (12), the wire passing channel (13) is gradually closed.

7. A vacuum-pumping device for cable extrusion machines according to claim 1, characterized in that: The connecting seat (1) is provided with a butt joint pipe (8), one end of the butt joint pipe (8) is connected with the vacuum pump, the other end penetrates into the wire passing channel (13) and the penetration position is close to the rear end (12).

8. A vacuum pump for cable extrusion machines according to claim 1, characterized in that: The sealing sheet (2) is made of rubber material.

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