A die head for an extruder capable of automatically discharging materials

Abstract

The present invention relates to the technical field of extruders, and in particular to a die head for an extruder capable of automatically discharging materials, comprising a die head shell, a pushing assembly being rotatably arranged inside the die head shell, the pushing assembly pushing waste materials from front to back, the pushing assembly comprising an elastic cylinder, a center tube assembly being arranged in the middle of the elastic cylinder, the center tube assembly comprising an inner center tube and an outer center tube arranged inside and outside, an inner support rod being spirally distributed on the inner center tube, the inner support rod extending radially along the inner center tube, an outer support rod being spirally distributed on the outer center tube, the outer support rod extending radially along the outer center tube, the inner support rod passing through the outer center tube, each turn of the inner support rod being located between two adjacent turns of the outer support rod, the inner support rod and the outer support rod being both hydraulic telescopic rods, the ends of the hydraulic telescopic rods being connected to the inner wall of the elastic cylinder, the inner support rod and the outer support rod being telescoped alternately, thereby changing the position of the spiral protrusion on the elastic cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of extruders, in particular to a die head for an extruder capable of automatically discharging materials. Background Art

[0002] The die head for an extruder is a molding component of an extruder, which is used to extrude the material melt from the extruder barrel from the die opening at a uniform speed and shape it.

[0003] The patent application document with application publication number CN115284573A discloses a die head for an extruder capable of automatic filtering and discharging, wherein a discharging screw is rotatably installed in a cavity, and a discharging device is provided on one side of the cavity. When the discharging screw is driven by a motor to rotate, the waste on the surface of the filter screen can be conveyed to the discharging device. However, since the discharging screw conveys the waste in one direction, long-term use will cause uneven wear on the discharging screw, affecting the normal extrusion of the waste and reducing the service life of the discharging screw. Summary of the invention

[0004] Based on this, it is necessary to provide an extruder die head that can automatically discharge materials in order to solve the technical problem that the current extruder die head has a low service life.

[0005] The above purpose is achieved through the following technical solutions:

[0006] The cam is provided with a push assembly which is rotatable inside the cam and pushes the waste material from front to back. The push assembly comprises an elastic tube, a central tube assembly is provided in the middle of the elastic tube, and the central tube assembly comprises an inner central tube and an outer central tube which are arranged inside and outside the cam, and the inner central tube and the outer central tube both extend in a front-to-back direction. An inner support rod is spirally distributed on the inner central tube, the inner support rod extends radially along the inner central tube, an outer support rod is spirally distributed on the outer central tube, the outer support rod extends radially along the outer central tube, the inner support rod passes through the outer central tube, each turn of the inner support rod is located between two adjacent turns of the outer support rod, the inner support rod and the outer support rod are both hydraulic telescopic rods, the ends of the hydraulic telescopic rods are connected to the inner wall of the elastic tube, the inner support rod and the outer support rod are alternately telescopic, so that the position of the spiral protrusion on the elastic tube changes.

[0007] Furthermore, the inner center tube can slide forward and backward relative to the outer center tube. The outer center tube is provided with a plurality of long holes, which extend in the front-to-back direction. The inner support rods correspond to the long holes one by one. The inner support rods extend from the long holes and can slide forward and backward along the long holes.

[0008] Furthermore, the elastic tube includes multiple support strips extending in the front-to-back direction, the support strips are rubber strips, the multiple support strips are evenly distributed around the circumference of the central tube assembly, and a columnar elastic membrane is commonly provided on the outside of the multiple support strips, and the elastic membrane is used to push the waste.

[0009] Furthermore, the front end of the inner center tube is connected to an inner liquid inlet head, and the extension and retraction of the inner support rod on the inner center tube can be controlled by conveying hydraulic oil to the inner liquid inlet head. An outer liquid inlet head is connected between the outer center tube and the inner center tube, and the extension and retraction of the outer support rod on the outer center tube can be controlled by conveying hydraulic oil to the outer liquid inlet head.

[0010] Furthermore, the front end of the inner center tube extends out from the front end of the outer center tube, the outer sleeve of the inner center tube is provided with a driving sleeve, the outer side of the inner center tube is provided with an annular partition plate, the annular partition plate can slide back and forth along the inner wall of the driving sleeve, and the driving sleeve is provided with a liquid inlet, and the annular partition plate is pushed to slide back and forth along the driving sleeve by delivering hydraulic oil to the liquid inlet, thereby controlling the sliding of the inner center tube relative to the outer center tube.

[0011] Furthermore, a front sealing plate and a rear sealing plate are respectively provided at the front and rear ends of the elastic tube, a center hole is provided at the center of the front sealing plate, the center tube assembly passes through the center hole and extends into the interior of the elastic tube and is fixedly connected to the rear sealing plate, and a discharge hole is provided on the die shell, through which waste materials in the die shell are discharged.

[0012] Furthermore, the pitch of the inner support rod is equal to the pitch of the outer support rod.

[0013] Furthermore, a filter screen is provided on the die housing, and the filter screen is used to retain the filtered waste materials inside the die housing.

[0014] Furthermore, a driving ring is provided at the front end of the central tube assembly, a transmission belt is sleeved on the driving ring, and the transmission belt is connected to a driving motor.

[0015] Furthermore, a discharge device is provided at the rear end of the die head shell, and the discharge device includes a discharge barrel, a plug is slidably provided in the discharge barrel, one end of the plug is connected to a spring, and the spring can push the plug. A discharge port is provided on the discharge barrel, and the plug can move between a position of opening the discharge port and a position of closing the discharge port.

[0016] The beneficial effects of the present invention are:

[0017] The die head for an extruder capable of automatic material discharge provided by the present invention has an inner support rod and an outer support rod that are alternately extended and retracted to change the position of the spiral protrusion on the elastic tube, so that the pushing surface formed on the elastic tube when the inner support rod is extended and the pushing surface formed on the elastic tube when the outer support rod is extended alternately push the waste material, so that the wear on the elastic tube is evenly distributed, avoiding wear caused by pushing the waste material at a certain position of the elastic tube for a long time, thereby extending the service life of the elastic tube.

[0018] Second, by sliding the inner center tube relative to the outer center tube, the distance between the spiral where the inner support rod is located and the spiral where the outer support rod is located is changed, thereby changing the pushing area and inclination of the pushing surface on the elastic tube, and making the wear of each part of the pushing surface uniform.

[0019] Third, when the position of the spiral protrusion on the elastic tube changes, the elastic membrane will continuously shrink and expand, so that the elastic membrane can prevent waste from adhering. Combined with the forward and backward sliding of the inner support rod, the degree of adhesion of waste on the elastic membrane can be further reduced, reducing the damage caused by waste to the elastic tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a die head for an extruder capable of automatic discharge provided by one embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of an elastic tube and a central tube assembly in a die head for an extruder capable of automatic material discharge provided by one embodiment of the present invention;

[0022] Figure 3 for Figure 2 A magnified view of the structure at center;

[0023] Figure 4 for Figure 2 A magnified view of the structure at B in the middle;

[0024] Figure 5 for Figure 4 Another state diagram of .

[0025] in:

[0026] 101. driving motor; 102. filter screen; 103. die housing; 1031. discharge hole; 104. transmission belt; 105. driving ring; 111. plug; 112. spring; 113. screw; 114. discharge barrel; 1141. discharge port; 201. front sealing plate; 202. rear sealing plate; 210. elastic barrel; 211. support bar; 212. elastic membrane; 220. center tube assembly; 221. outer center tube; 2211. long hole; 222. inner center tube; 2221. annular partition plate; 223. outer liquid inlet head; 224. driving sleeve; 225. inner liquid inlet head; 207. inner support rod; 208. outer support rod. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] In the present invention, 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" or "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" or "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.

[0030] like Figures 1 to 5As shown, an extruder die head capable of automatic discharge provided by one embodiment of the present invention comprises a die head housing 103, wherein a pusher assembly is rotatably arranged inside the die head housing 103, wherein the pusher assembly pushes waste material from front to back, wherein the pusher assembly comprises an elastic cylinder 210, wherein a central tube assembly 220 is arranged in the middle of the elastic cylinder 210, wherein the central tube assembly 220 comprises an inner central tube 222 and an outer central tube 221 which are arranged inside and outside, wherein the inner central tube 222 and the outer central tube 221 both extend in the front-to-back direction, wherein an inner support rod 207 is spirally distributed on the inner central tube 222, and the inner support rod 207 is spirally distributed on the inner central tube 222. 7 extends radially along the inner center tube 222, and the outer center tube 221 is spirally distributed with an outer support rod 208, and the outer support rod 208 extends radially along the outer center tube 221, and the inner support rod 207 passes through the outer center tube 221, and each turn of the inner support rod 207 is located between two adjacent turns of the outer support rod 208, and the inner support rod 207 and the outer support rod 208 are both hydraulic telescopic rods, and the ends of the hydraulic telescopic rods are connected to the inner wall of the elastic tube 210, and the inner support rod 207 and the outer support rod 208 are alternately extended and retracted, so that the position of the spiral protrusion on the elastic tube 210 changes.

[0031] Specifically, the hydraulic telescopic rods include a hydraulic cylinder and a hydraulic rod, and the extension and retraction of the hydraulic rod in the hydraulic cylinder can be controlled by injecting hydraulic oil into the hydraulic cylinder. The inner support rods 207 are evenly distributed around the circumference of the inner center tube 222, and the outer support rods 208 are evenly distributed around the circumference of the outer center tube 221. The inner support rods 207 and the outer support rods 208 are correspondingly arranged in the front-to-back direction. The longest state and the shortest state of the hydraulic telescopic rod are adjustable, so that the height difference between the raised position and the recessed position of the elastic cylinder 210 can be changed.

[0032] The alternating extension and retraction of the inner support rod 207 and the outer support rod 208 changes the position of the spiral protrusion on the elastic tube 210, so that the push surface formed on the elastic tube 210 when the inner support rod 207 is extended and the push surface formed on the elastic tube 210 when the outer support rod 208 is extended alternately push the waste material, so that the wear on the elastic tube 210 is evenly distributed, avoiding the wear caused by pushing the waste material for a long time at a certain position of the elastic tube 210, thereby extending the service life of the elastic tube 210. The push surface in the present invention is a rearward inclined surface formed by the spiral protrusion on the elastic tube 210.

[0033] In one embodiment, the inner central tube 222 can slide forward and backward relative to the outer central tube 221. The outer central tube 221 is provided with a plurality of long holes 2211, and the long holes 2211 extend in the front-to-back direction. The inner support rods 207 correspond to the long holes 2211 one by one, and the inner support rods 207 extend from the long holes 2211 and can slide forward and backward along the long holes 2211. Figure 4 and Figure 5As shown, by sliding the inner center tube 222 relative to the outer center tube 221, the distance between the spiral where the inner support rod 207 is located and the spiral where the outer support rod 208 is located is changed, thereby changing the pushing area and the inclination of the pushing surface, and making the wear of each part of the pushing surface uniform.

[0034] In one embodiment, the elastic tube 210 includes a plurality of support strips 211 extending in the front-to-back direction, the support strips 211 are rubber strips, the plurality of support strips 211 are evenly distributed around the circumference of the central tube assembly 220, and the outer portions of the plurality of support strips 211 are collectively sleeved with a columnar elastic film 212, the elastic film 212 being used to push the waste. The elastic film 212 is a plastic film. The inner support rod 207 and the outer support rod 208 distributed in the front-to-back direction are fixedly connected to the same support strip 211. When the position of the spiral protrusion on the elastic tube 210 changes, the elastic film 212 will continuously shrink and expand, so that the elastic film 212 can avoid the waste from adhering, and combined with the front-to-back sliding of the inner support rod 207, the degree of adhesion of the waste on the elastic film 212 can be further reduced, thereby preventing the waste from damaging the elastic tube 210.

[0035] In one embodiment, the front end of the inner center tube 222 is connected to an inner liquid inlet head 225, and the extension and retraction of the inner support rod 207 on the inner center tube 222 can be controlled by conveying hydraulic oil to the inner liquid inlet head 225. An outer liquid inlet head 223 is connected between the outer center tube 221 and the inner center tube 222, and the extension and retraction of the outer support rod 208 on the outer center tube 221 can be controlled by conveying hydraulic oil to the outer liquid inlet head 223.

[0036] In one embodiment, the front end of the inner center tube 222 extends out from the front end of the outer center tube 221, and the outer sleeve of the inner center tube 222 is provided with a driving sleeve 224. The outer part of the inner center tube 222 is provided with an annular partition plate 2221, and the annular partition plate 2221 can slide back and forth along the inner wall of the driving sleeve 224. The driving sleeve 224 is provided with a liquid inlet, and the annular partition plate 2221 is pushed to slide back and forth along the driving sleeve 224 by delivering hydraulic oil to the liquid inlet, thereby controlling the sliding of the inner center tube 222 relative to the outer center tube 221.

[0037] In one embodiment, the front and rear ends of the elastic tube 210 are respectively provided with a front sealing plate 201 and a rear sealing plate 202, the center of the front sealing plate 201 is provided with a center hole, the center tube assembly 220 extends into the interior of the elastic tube 210 through the center hole and is fixedly connected to the rear sealing plate 202, the die housing 103 is provided with a discharge hole 1031, and the waste in the die housing 103 is discharged through the discharge hole 1031. The front and rear ends of the support bar 211 are respectively fixedly arranged on the front sealing plate 201 and the rear sealing plate 202.

[0038] In one embodiment, the pitch of the inner support rod 207 is equal to the pitch of the outer support rod 208. In this way, a plurality of push surfaces with the same area and inclination can be formed.

[0039] In one embodiment, a filter screen 102 is disposed on the die housing 103 , and the filter screen 102 is used to retain the filtered waste materials inside the die housing 103 .

[0040] In one embodiment, a driving ring 105 is disposed at the front end of the central tube assembly 220 , a transmission belt 104 is sleeved on the driving ring 105 , and the transmission belt 104 is transmission-connected to a driving motor 101 .

[0041] In one embodiment, a discharge device is provided at the rear end of the die housing 103, and the discharge device includes a discharge barrel 114, in which a plug 111 is slidably provided, one end of the plug 111 is connected to a spring 112, and the spring 112 can push the plug 111, and the other end of the spring 112 is sleeved on a screw 113, and the screw 113 is rotatably provided on the discharge barrel 114, and the screw 113 can limit the position of the plug 111, thereby adjusting the movement stroke of the plug 111. The discharge barrel 114 is provided with a discharge port 1141, and the plug 111 can move between a position of opening the discharge port 1141 and a position of closing the discharge port 1141.

[0042] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0043] The molten material extruded by the extruder enters the die housing 103 , flows out after being filtered by the filter screen 102 , and the waste material remains inside the die housing 103 .

[0044] In the initial state, if Figure 4As shown, the inner support rod 207 is located in the middle of the long hole 2211. The hydraulic pump is used to deliver or suck hydraulic oil to the inner liquid inlet head 225 and the outer liquid inlet head 223, and the inner support rod 207 on the inner center tube 222 is first controlled to extend to the longest state, and the outer support rod 208 on the outer center tube 221 is contracted to the shortest state, so that the first spiral protrusion is formed on the elastic tube 210. Then the drive motor 101 is started, and the drive motor 101 drives the center tube assembly 220 to rotate, and drives the elastic tube 210 to rotate to push the waste backward. At the same time, hydraulic oil is injected into the drive sleeve 224 through the hydraulic pump, and the inner center tube 222 is pushed to slide back and forth, thereby changing the position of the inner support rod 207 in the long hole 2211, and then the distance between the inner support rod 207 and the outer support rod 208 is changed, and the push area and inclination of the push surface formed are changed, which can make the wear of each part of the push surface uniform. Finally, the inner center tube 222 is reset, and the inner support rod 207 is relocated to the middle position of the long hole 2211.

[0045] Then, the inner support rod 207 on the inner central tube 222 is controlled by the hydraulic pump to shrink to the shortest state, and the outer support rod 208 on the outer central tube 221 is extended to the longest state, so that the second spiral protrusion is re-formed on the elastic tube 210. Then the drive motor 101 is started, and the drive motor 101 drives the central tube assembly 220 to rotate, and drives the elastic tube 210 to rotate to push the waste material backward. In this way, the positions of the spiral protrusions formed twice on the elastic tube 210 are different, so that the positions of the push surfaces on the elastic tube 210 are different, and the waste material is pushed alternately, which can make the wear on the elastic tube 210 evenly distributed, avoid the wear caused by pushing the waste material for a long time at a certain position of the elastic tube 210, thereby extending the service life of the elastic tube 210. At the same time, the hydraulic pump pushes the inner central tube 222 to slide back and forth, change the position of the inner support rod 207 in the long hole 2211, and then the push area and the inclination of the push surface formed are changed, and the wear of each part of the push surface is even. Finally, the inner center tube 222 is reset, and the inner support rod 207 is relocated to the middle position of the long hole 2211.

[0046] The above process is repeated in this way to realize the transportation of waste. The waste enters the discharge cylinder 114 from the discharge hole 1031 through the push of the elastic cylinder 210. As the waste accumulates, the accumulated waste pushes the plug 111, causing the plug 111 to move to a position to open the discharge port 1141, so that the waste automatically flows out of the discharge port 1141, and then the plug 111 automatically resets under the action of the spring 112 to re-close the discharge port 1141.

[0047] Among them, since the inner support rod 207 and the outer support rod 208 are both hydraulic telescopic rods, the longest state and the shortest state of the inner support rod 207 and the outer support rod 208 can be adjusted according to actual needs. In order to ensure uniform wear of the elastic tube 210, the telescopic length of the inner support rod 207 and the outer support rod 208 remains consistent.

[0048] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A die head for an extruder capable of automatically discharging materials, characterized in that: The die head shell comprises a die head shell, wherein a pusher assembly is rotatably arranged inside the die head shell, and the pusher assembly pushes the waste material from front to back, and the pusher assembly comprises an elastic tube, and a center tube assembly is arranged in the middle of the elastic tube, and the center tube assembly comprises an inner center tube and an outer center tube arranged inside and outside, and the inner center tube and the outer center tube both extend in the front-to-back direction, and an inner support rod is spirally distributed on the inner center tube, and the inner support rod extends in the radial direction of the inner center tube, and an outer support rod is spirally distributed on the outer center tube, and the outer support rod extends in the radial direction of the outer center tube. The inner support rod passes through the outer center tube, and each turn of the inner support rod is located between two adjacent turns of the outer support rod. The inner support rod and the outer support rod are both hydraulic telescopic rods, and the ends of the hydraulic telescopic rods are connected to the inner wall of the elastic tube. The inner support rod and the outer support rod are alternately telescoped, thereby changing the position of the spiral protrusion on the elastic tube. The inner center tube can slide back and forth relative to the outer center tube. The elastic tube includes a plurality of support bars extending in the front-to-back direction, and a columnar elastic membrane is commonly provided on the outside of the plurality of support bars, and the elastic membrane is used to push the waste.

2. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: The outer central tube is provided with a plurality of long holes, the long holes extending in the front-rear direction, the inner support rods corresponding to the long holes one by one, the inner support rods extending from the long holes and being able to slide forward and backward along the long holes.

3. The die head for an extruder capable of automatically discharging materials according to claim 2, characterized in that: The support strips are rubber strips, and a plurality of support strips are evenly distributed around the circumference of the central tube assembly.

4. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: The front end of the inner center tube is connected to an inner liquid inlet head, and the extension and retraction of the inner support rod on the inner center tube can be controlled by conveying hydraulic oil to the inner liquid inlet head. An outer liquid inlet head is connected between the outer center tube and the inner center tube, and the extension and retraction of the outer support rod on the outer center tube can be controlled by conveying hydraulic oil to the outer liquid inlet head.

5. The die head for an extruder capable of automatically discharging materials according to claim 2, characterized in that: The front end of the inner center tube extends out from the front end of the outer center tube, the outer sleeve of the inner center tube is provided with a driving sleeve, the outer side of the inner center tube is provided with an annular partition plate, the annular partition plate can slide back and forth along the inner wall of the driving sleeve, and the driving sleeve is provided with a liquid inlet. By delivering hydraulic oil to the liquid inlet, the annular partition plate is pushed to slide back and forth along the driving sleeve, thereby controlling the sliding of the inner center tube relative to the outer center tube.

6. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: The front and rear ends of the elastic tube are respectively provided with a front sealing plate and a rear sealing plate, the center of the front sealing plate is provided with a center hole, the center tube assembly passes through the center hole and extends into the interior of the elastic tube and is fixedly connected to the rear sealing plate, and the die shell is provided with a discharge hole, and the waste in the die shell is discharged through the discharge hole.

7. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: The pitch of the inner support rod is equal to the pitch of the outer support rod.

8. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: The die housing is provided with a filter screen, and the filter screen is used to keep the filtered waste materials inside the die housing.

9. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: A driving ring is provided at the front end of the central tube assembly, a transmission belt is sleeved on the driving ring, and the transmission belt is connected to a driving motor.

10. The die head for an extruder capable of automatically discharging materials according to claim 1, characterized in that: A discharge device is provided at the rear end of the die shell, and the discharge device includes a discharge barrel, a plug is slidably provided in the discharge barrel, one end of the plug is connected to a spring, and the spring can push the plug. A discharge port is provided on the discharge barrel, and the plug can move between a position of opening the discharge port and a position of closing the discharge port.

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