Novel double-layer extrusion rod structure

Abstract

The invention belongs to the technical field of extruders, and particularly relates to a novel double-layer extrusion rod structure which comprises a main oil cylinder, a piston bracket fixedly installed on a piston of the main oil cylinder through a bolt, a core rod installed in the middle of the other side of the piston bracket, and an inner sleeve rod arranged outside the core rod in a sleeving mode. The inner sleeve rod is fixedly connected with the piston bracket through a pressure pad and a bolt, an outer sleeve rod is sleeved outside the inner sleeve rod, a cross beam is sleeved on one side, close to the piston bracket, of the inner sleeve rod, a pressing sleeve is sleeved on one end, close to the cross beam, of the outer sleeve rod, the pressing sleeve is fixedly connected with the outer sleeve rod through a bolt, and the pressing sleeve is fixedly connected with the cross beam through a bolt. A plurality of auxiliary oil cylinders are distributed on the piston bracket, and pistons of the auxiliary oil cylinders are fixedly connected with the cross beam. In the process of extrusion production of the layered composite pipe or the composite rod, higher pressure can be independently applied to the outer-layer blank, so that the flowing speed of the outer-layer material can be matched with the flowing speed of the inner-layer material.

Description

Technical Field

[0001] This invention belongs to the field of extrusion press technology, specifically relating to a novel double-layer extrusion bar structure. Background Technology

[0002] Extrusion presses are currently key equipment in the production of non-ferrous metal pipes, bars, and profiles. Extrusion technology is a crucial technique that uses the compressive stress and specific temperature conditions of an extrusion press to shape an initial billet. Currently, pipes made from a single material are insufficient for applications under complex conditions. Layered metal composite pipes combine the superior properties of two materials to meet the demands of applications in these challenging environments.

[0003] However, in the process of producing layered composite pipes or composite rods using traditional extruders, the inner and outer blanks do not have a strong bond, and the flow rate of the inner material is always greater than that of the outer material during extrusion. In particular, when the thermoplasticity of the outer material is less than that of the inner material, it will cause unevenness of the outer material in the axial direction in the double-layer composite pipe, affecting its yield and application. Summary of the Invention

[0004] The present invention provides a novel double-layer extrusion bar structure to address the above-mentioned problems.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A novel double-layer extrusion rod structure includes a main hydraulic cylinder. A piston bracket is bolted to the piston of the main hydraulic cylinder. A core rod is installed in the middle of the other side of the piston bracket. An inner sleeve rod is fitted outside the core rod. The inner sleeve rod is fixedly connected to the piston bracket by a pressure pad and bolts. The core rod is pressed and fixed to the piston bracket by the inner sleeve rod. An outer sleeve rod is fitted outside the inner sleeve rod. A crossbeam is fitted on the side of the inner sleeve rod near the piston bracket. A pressure sleeve is fitted on the end of the outer sleeve rod near the crossbeam. The pressure sleeve is bolted to the outer sleeve rod and the crossbeam. Multiple auxiliary hydraulic cylinders are distributed on the piston bracket. The pistons of the auxiliary hydraulic cylinders are fixedly connected to the crossbeam.

[0006] Furthermore, a limiting sleeve rod is threadedly connected to the end of the inner sleeve rod away from the piston bracket. The limiting sleeve rod is convex in shape, and the small diameter end of the limiting sleeve rod is threadedly connected to the inner sleeve rod. A sliding cavity corresponding to the large diameter end of the limiting sleeve rod is formed on the outer sleeve rod.

[0007] Furthermore, an inner pad is fitted onto the end of the core rod away from the piston bracket, and an outer pad is fitted onto the outside of the inner pad. The inner pad corresponds to the large-diameter end of the limiting sleeve rod, and the outer pad corresponds to the outer sleeve rod.

[0008] Furthermore, the maximum sliding stroke between the limiting sleeve and the sliding cavity is 100mm.

[0009] Furthermore, the core rod and the inner sleeve rod, as well as the inner sleeve rod and the outer sleeve rod, are all clearance fits.

[0010] Furthermore, a groove is provided on the piston of the main cylinder, a positioning block corresponding to the groove is provided on the piston bracket, and a center positioning hole corresponding to the core rod is provided on the other side of the piston bracket.

[0011] Furthermore, the main cylinder and auxiliary cylinders are connected to the oil tank via connecting assemblies. The connecting assemblies include a filter, a variable pump, a pressure gauge, a check valve, a solenoid directional valve, a one-way throttle valve, and a pilot relief valve connected in sequence. The inlet of the filter is connected to the oil tank via a pipeline. The oil inlets of multiple auxiliary cylinders are connected in parallel to the outlets of their respective pilot relief valves. The oil outlets of multiple auxiliary cylinders are connected in parallel to their respective solenoid directional valves. The oil inlet of the main cylinder is connected to the outlet of its respective pilot relief valve. The oil outlet of the main cylinder is connected to its respective solenoid directional valve. The return port of the solenoid directional valve is connected to the oil tank.

[0012] Compared with the prior art, the present invention has the following advantages: The double-layer extrusion rod structure of this invention provides the outer rod with additional extrusion force and stroke via a secondary hydraulic cylinder. This allows for the application of a higher pressure to the outer layer blank during the extrusion production of layered composite tubes or rods, enabling the flow rate of the outer layer material to match that of the inner layer material. This satisfies the molding requirements of layered composite tubes or rods with significant differences in thermoplasticity. Furthermore, this invention employs a hydraulic system to control the double-layer extrusion rod structure, allowing for real-time adjustment of the pressure and stroke of the inner and outer layers during extrusion, thus meeting the molding technology requirements of layered metal composite materials of different materials. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the structure before the composite rod is produced according to the present invention; Figure 4 This is a schematic diagram of the process of producing composite rods according to the present invention; Figure 5 This is a schematic diagram of the structure before the composite pipe is produced according to the present invention; Figure 6 This is a schematic diagram of the structure during the production process of the composite pipe according to the present invention; In the diagram, the components are: main cylinder 1, piston bracket 2, core rod 3, inner sleeve rod 4, pressure pad 5, outer sleeve rod 6, crossbeam 7, pressure sleeve 8, auxiliary cylinder 9, limit sleeve rod 10, sliding cavity 11, inner pad 12, outer pad 13, groove 14, positioning block 15, center positioning hole 16, oil tank 17, filter 18, variable pump 19, pressure gauge 20, one-way valve 21, solenoid directional valve 22, one-way throttle valve 23, pilot relief valve 24, extrusion cylinder 25, mold 26, inner blank 27, outer blank 28, and center rod 29. Detailed Implementation

[0014] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0015] like Figure 1 and Figure 2 As shown, a novel double-layer extrusion rod structure includes a main cylinder 1. A piston bracket 2 is bolted to the piston of the main cylinder 1. A groove 14 is provided on the piston of the main cylinder 1. A positioning block 15 corresponding to the groove 14 is provided on the piston bracket 2. A core rod 3 is installed in the middle of the other side of the piston bracket 2. A center positioning hole 16 corresponding to the core rod 3 is opened on the other side of the piston bracket 2. An inner sleeve rod 4 is sleeved on the outside of the core rod 3. The inner sleeve rod 4 is fixedly connected to the piston bracket 2 by a pressure pad 5 and bolts. The core rod 3 is pressed and fixed on the piston bracket 2 by the inner sleeve rod 4. An outer sleeve rod 6 is sleeved on the outside of the inner sleeve rod 4. The core rod 3 and the inner sleeve rod 4, as well as the inner sleeve rod 4 and the outer sleeve rod 6, are clearance fits. A crossbeam 7 is sleeved on the side of the inner sleeve rod 4 near the piston bracket 2. A pressure sleeve 8 is fitted onto one end of the crossbeam 7. The pressure sleeve 8 is fixedly connected to the outer sleeve rod 6 by bolts. The pressure sleeve 8 is fixedly connected to the crossbeam 7 by bolts. Multiple auxiliary oil cylinders 9 are distributed on the piston bracket 2. The pistons of the auxiliary oil cylinders 9 are fixedly connected to the crossbeam 7. A limiting sleeve rod 10 is threadedly connected to the end of the inner sleeve rod 4 away from the piston bracket 2. The limiting sleeve rod 10 is convex in shape. The small diameter end of the limiting sleeve rod 10 is threadedly connected to the inner sleeve rod 4. A sliding cavity 11 corresponding to the large diameter end of the limiting sleeve rod 10 is opened on the outer sleeve rod 6. The maximum sliding stroke between the limiting sleeve rod 10 and the sliding cavity 11 is 100mm. An inner pad 12 is fitted onto the end of the core rod 3 away from the piston bracket 2. An outer pad 13 is fitted onto the outside of the inner pad 12. The inner pad 12 corresponds to the large diameter end of the limiting sleeve rod 10, and the outer pad 13 corresponds to the outer sleeve rod 6.

[0016] The main cylinder 1 and auxiliary cylinder 9 are respectively connected to the oil tank 17 via a connecting assembly. The connecting assembly includes a filter 18, a variable pump 19, a pressure gauge 20, a one-way valve 21, a solenoid directional valve 22, a one-way throttle valve 23, and a pilot relief valve 24 connected in sequence. The inlet of the filter 18 is connected to the oil tank 17 via a pipeline. The oil inlets of multiple auxiliary cylinders 9 are connected in parallel to the outlets of the corresponding pilot relief valves 24. The oil outlets of multiple auxiliary cylinders 9 are connected in parallel to the corresponding solenoid directional valves 22. The oil inlet of the main cylinder 1 is connected to the outlet of the corresponding pilot relief valve 24. The oil outlet of the main cylinder 1 is connected to the corresponding solenoid directional valve 22. The return port of the solenoid directional valve 22 is connected to the oil tank 17.

[0017] Composite rod production process: like Figure 3 and Figure 4 As shown, the working principle of the extruder is that under high pressure, the billet passes through the die 26, and then deforms according to the shape of the die 26 to obtain the desired product. Specifically, in this invention: during extrusion, the inner pad 12 and the outer pad 13 are first assembled together and then installed on the mandrel 3. The inner layer billet 27 and the outer layer billet 28 are then assembled and placed into the extrusion cylinder 25. The die 26 is installed on the outlet side of the extrusion cylinder 25. When the extruder starts working, the two variable pumps 19 start working simultaneously. First, the one-way throttle valve 23 and the pilot overflow valve 24 in the connecting assembly corresponding to the main cylinder 1 are adjusted to gradually increase the speed and pressure of the main cylinder 1 until the inner layer billet 27 and the outer layer billet 28 are in contact with the die 26, and the inner layer billet 27 is in contact with the inner pad 12, and the outer layer billet 28 is in contact with the outer pad 16. Upon contact, the pressure value of the pressure gauge 20 in the connecting assembly corresponding to the main cylinder 1 rises rapidly. The speed and pressure of the main cylinder 1 are adjusted to reach the set extrusion parameters. Then, the one-way throttle valve 23 and the pilot overflow valve 24 in the connecting assembly corresponding to the auxiliary cylinder 9 are adjusted. Multiple auxiliary cylinders 9 simultaneously push the crossbeam 7 and the outer sleeve rod 6 forward to bring the pressure and speed to the set extrusion parameters. When the auxiliary cylinders 9 start working, the outer sleeve rod 6 begins to move slowly forward relative to the core rod 3, pushing the outer pad 13 forward and causing the inner pad 12 and the outer pad 13 to misalign. The outer pad 13 further pushes the outer blank 28 forward, thereby compensating for the flow rate difference between the outer blank 28 and the inner blank 27. After extrusion, the main cylinder 1 and the auxiliary cylinders 9 simultaneously begin to retreat until they return to their pre-extrusion positions.

[0018] like Figure 5 and Figure 6 As shown, during the production of composite pipes, an additional central rod 29 that works with mold 26 needs to be fixed at the front end of the inner pad 12. The production process is the same as that of composite rods.

[0019] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0020] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel double layer extruded pole structure characterized by: The utility model provides a kind of hydraulic cylinder, including main oil cylinder (1), piston bracket (2) is fixedly installed on the piston of the main oil cylinder (1) by bolt, core rod (3) is installed in the middle of the other side of the piston bracket (2), inner sleeve rod (4) is set on the outside of the core rod (3), the inner sleeve rod (4) is fixedly connected with piston bracket (2) by pressure pad (5) and bolt, the core rod (3) is fixedly connected on piston bracket (2) by inner sleeve rod (4), outer sleeve rod (6) is set on the outside of the inner sleeve rod (4), beam (7) is set on the side of the inner sleeve rod (4) close to piston bracket (2), pressure sleeve (8) is set on the end of the outer sleeve rod (6) close to beam (7), the pressure sleeve (8) is fixedly connected with outer sleeve rod (6) by bolt, the pressure sleeve (8) is fixedly connected with beam (7) by bolt, a plurality of auxiliary oil cylinders (9) are arranged on the piston bracket (2), the piston of the auxiliary oil cylinder (9) is fixedly connected with beam (7).

2. A novel double layer extruded rod structure as claimed in claim 1, wherein: Limit sleeve rod (10) is threadedly connected to the end of the inner sleeve rod (4) away from the piston bracket (2), the limit sleeve rod (10) is in the shape of a convex letter, the small-diameter end of the limit sleeve rod (10) is threadedly connected with the inner sleeve rod (4), and a sliding cavity (11) corresponding to the large-diameter end of the limit sleeve rod (10) is formed in the outer sleeve rod (6).

3. A novel double layer extruded rod structure as claimed in claim 2, wherein: An inner pad (12) is sleeved to the end of the core rod (3) away from the piston bracket (2), an outer pad (13) is set on the outside of the inner pad (12), the inner pad (12) corresponds to the large-diameter end of the limit sleeve rod (10), and the outer pad (13) corresponds to the outer sleeve rod (6).

4. A novel double layer extruded rod structure as claimed in claim 2, wherein: The maximum sliding stroke between the limit sleeve rod (10) and the sliding cavity (11) is 100 mm.

5. A novel double layer extruded rod structure as claimed in claim 1, wherein: The core rod (3) and the inner sleeve rod (4) and the inner sleeve rod (4) and the outer sleeve rod (6) are gap-fitted.

6. A novel double layer extruded rod structure as claimed in claim 1, wherein: A recess (14) is arranged on the piston of the main oil cylinder (1), a positioning block (15) corresponding to the recess (14) is arranged on the piston bracket (2), and a central positioning hole (16) corresponding to the core rod (3) is formed in the other side of the piston bracket (2).

7. A novel double layer extruded rod structure as claimed in claim 1, wherein: The main oil cylinder (1) and the auxiliary oil cylinders (9) are respectively connected with an oil tank (17) through a connecting assembly, the connecting assembly comprises a filter (18), a variable pump (19), a pressure gauge (20), a one-way valve (21), an electromagnetic reversing valve (22), a one-way throttle valve (23) and a pilot relief valve (24) connected in sequence, the inlet of the filter (18) is connected with the oil tank (17) through a pipeline, the oil inlets of the auxiliary oil cylinders (9) are connected in parallel to the outlets of the corresponding pilot relief valves (24), the oil outlets of the auxiliary oil cylinders (9) are connected in parallel to the corresponding electromagnetic reversing valves (22), the oil inlet of the main oil cylinder (1) is connected with the outlet of the corresponding pilot relief valve (24), the oil outlet of the main oil cylinder (1) is connected with the corresponding electromagnetic reversing valve (22), and the oil return port of the electromagnetic reversing valve (22) is connected with the oil tank (17).

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