Novel structure extrusion container and pre-tightening method

Abstract

The invention belongs to the field of metal plastic processing equipment, and discloses a novel structure extrusion container and a pre-tightening method.The extrusion container is of a multi-layer container structure, an annular cavity exists between every two adjacent containers, liquid is filled through a one-way liquid supplementing valve, the liquid filling pressure and exhaust are set through a high-pressure overflow valve, and the cavities are filled with high-pressure liquid; and the pre-stress required by assembly is further generated.

Description

Technical Field

[0001] The invention belongs to the field of metal plastic processing equipment and relates to a new type of structural extrusion cylinder of an extruder and a pre-tightening method. Background Art

[0002] In order to increase the service life, the extrusion barrel of the current metal extruder generally adopts a multi-layer barrel structure, and the diameter size of each barrel is designed according to the interference fit, thereby generating assembly prestress. In order to ensure that the size of the assembly prestress meets the design requirements, the dimensional accuracy and surface roughness of each layer of the extrusion barrel are extremely high, and the machining difficulty is extremely high. Moreover, the interference fit extrusion barrel is also extremely difficult to disassemble when the inner barrel is damaged due to expiration of its service life and needs to be replaced. Summary of the invention

[0003] The present invention provides a novel structure of an extrusion cylinder and a pre-tightening method, which provides prestress through ultra-high pressure liquid, reduces the processing accuracy requirements of the extrusion cylinder, and at the same time, since interference fit is no longer used between the layers of the extrusion cylinder, it is easier to disassemble when the inner cylinder is damaged and replaced.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, the present invention provides an extrusion cylinder with a novel structure, wherein the extrusion cylinder is a multi-layer cylinder structure, and an annular cavity exists between adjacent cylinders; A one-way liquid replenishing valve and a high-pressure relief valve are installed on the end surface of the outer cylinder of the adjacent cylinder, and the one-way liquid replenishing valve and the high-pressure relief valve are both connected with the cavity through the processed channel.

[0005] Furthermore, Sealing structures are installed on both side end surfaces of the extrusion cylinder to enable the cavity to be sealed.

[0006] Furthermore, If the number of extrusion cylinder layers is greater than or equal to 3, the cavities between the layers of cylinders are not connected to each other, and each cavity has a one-way liquid replenishing valve and a high-pressure relief valve that are individually connected to it.

[0007] Furthermore, Different pressures are set in different cavities to produce different levels of prestress.

[0008] In a second aspect, the present invention further provides a pre-tightening method for a novel structure extrusion cylinder, the method being applied to the novel structure extrusion cylinder, the pre-tightening method comprising: S1, high-pressure liquid is injected into the cavity by the one-way liquid replenishing valve, and the liquid pressure is set by the high-pressure relief valve; S2, when the cavity reaches the set pressure P1, the high-pressure relief valve opens to discharge the air; S3, when the cavity is filled with liquid, stop injecting high-pressure liquid into the one-way liquid replenishing valve; S4, after the filling is completed, the annular cavity will be filled with high-pressure liquid with a set pressure P1, generating the prestress required for the assembly of the extrusion cylinder.

[0009] Furthermore, The cavities between the layers of cylinders are set with different liquid pressures as required, thereby generating prestress of different levels.

[0010] Furthermore, When the liquid pressure in the cavity of the extruder increases due to temperature changes, the high-pressure relief valve automatically opens to discharge part of the liquid to keep the liquid pressure in the cavity unchanged.

[0011] The technical effects of the invention are: 1. The assembly prestress of the extrusion cylinder is generated by high-pressure liquid, which reduces the processing accuracy requirements of the extrusion cylinder, and since interference fit is no longer used between the layers of extrusion cylinders, it is easier to disassemble and replace the inner cylinder when it is damaged; 2. The liquid pressure can be accurately set by adjusting the high-pressure relief valve, and then the value of the assembly prestress of the extrusion cylinder can be accurately controlled, which is more precise and controllable than the prestress generated by the existing interference fit; 3. When the number of cylinder layers is greater than or equal to 3, different liquid pressures can be set for the cavities between the layers of cylinders as needed, thereby generating prestress of different levels; 4. When the liquid pressure in the cavity of the extrusion cylinder increases due to temperature changes, the high-pressure relief valve can automatically open to discharge part of the liquid to keep the liquid pressure in the cavity unchanged, thereby ensuring that the assembly prestress is not affected by temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of a novel structure extrusion cylinder provided by the present invention; Figure 2 yes Figure 1 A cross-sectional view of Figure 3 yes Figure 2 A partial enlarged view of In the figure, 1. inner cylinder; 2. middle cylinder; 3. outer cylinder; 4-1. first one-way liquid replenishing valve; 4-2. second one-way liquid replenishing valve; 5-1. first high-pressure relief valve; 5-2. second high-pressure relief valve; 6. sealing structure; 7-1. first cavity; 7-2. second cavity; 8-1. first liquid filling port; 8-2. second liquid filling port. DETAILED DESCRIPTION

[0013] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0014] The embodiment of the present invention provides an extrusion cylinder of a new structure, which is a multi-layer cylinder structure. There is an annular cavity between adjacent cylinders. A one-way refill valve and a high-pressure relief valve are installed on the end face of the extrusion cylinder. The one-way refill valve and the high-pressure relief valve are connected to the cavity through processed channels. A sealing structure 6 is installed near the end faces of both sides of the extrusion cylinder to ensure that the cavity has good sealing. If the number of layers of the extrusion cylinder is greater than or equal to 3, the cavities between the layers of cylinders are not connected to each other, and each individual cavity has a one-way refill valve and a high-pressure relief valve connected to it in a single motion. High-pressure liquid is injected into the cavity by the one-way refill valve, and the liquid pressure is set by the high-pressure relief valve. When the cavity reaches the set pressure, the high-pressure relief valve opens to exhaust the air; when the liquid fills the cavity, the injection of high-pressure liquid into the one-way refill valve stops. After the filling is completed, the annular cavity will be filled with high-pressure liquid of the set pressure, generating the prestress required for the assembly of the extrusion cylinder.

[0015] Specifically, like Figure 1 , 2 As shown in Figures 3 and 4, a new type of extrusion cylinder works in the following manner: the extrusion cylinder is a three-layer cylinder structure, which includes an inner cylinder 1, a middle cylinder 2 and an outer cylinder 3. There is a first cavity 7-1 between the inner cylinder 1 and the middle cylinder 2, and a first one-way liquid replenishing valve 4-1 and a first high-pressure relief valve 5-1 are installed on the end surface of the middle cylinder 2. The first one-way liquid replenishing valve 4-1 and the first high-pressure relief valve 5-1 are both connected to the first cavity 7-1 through a channel. A sealing structure 6 is installed near the end surfaces on both sides of the extrusion cylinder to ensure that the first cavity 7-1 has good sealing performance.

[0016] There is a second cavity 7-2 between the middle cylinder 2 and the outer cylinder 3. A second one-way liquid replenishing valve 4-2 and a second high-pressure relief valve 5-2 are installed on the end face of the outer cylinder 3. The second one-way liquid replenishing valve 4-2 and the second high-pressure relief valve 5-2 are both connected to the second cavity 7-2 through channels. A sealing structure 6 is installed near the end faces on both sides of the extrusion cylinder to ensure that the second cavity 7-2 has good sealing properties.

[0017] The first cavity 7-1 and the second cavity 7-2 are not connected to each other, and both the first cavity 7-1 and the second cavity 7-2 are annular cavities.

[0018] High-pressure liquid is injected into the first cavity 7-1 through the first filling port 8-1 of the first one-way liquid replenishing valve 4-1, and the liquid pressure P1 is set by the first high-pressure relief valve 5-1. When the set pressure P1 is reached in the first cavity 7-1, the first high-pressure relief valve 5-1 opens to exhaust the air; when the liquid fills the first cavity 7-1, the injection of high-pressure liquid into the first one-way liquid replenishing valve 4-1 stops. After the filling is completed, the first cavity 7-1 will be filled with high-pressure liquid of the set pressure P1, generating the prestress F1 required for the assembly of the extrusion cylinder.

[0019] The same process is adopted to inject high pressure liquid into the second cavity 7-2, and the liquid pressure P2 is set by the second high pressure relief valve 5-2. After the filling is completed, the second cavity 7-2 will be filled with high pressure liquid of the set pressure P2, generating the prestress F2 required for the assembly of the extrusion cylinder.

[0020] As required, the liquid pressure P1 in the first cavity 7-1 and the liquid pressure P2 in the second cavity 7-2 may be different, thereby generating prestresses F1 and F2 of different levels.

[0021] A new type of structural extrusion cylinder provided by an embodiment of the present invention generates extrusion cylinder assembly prestress through high-pressure liquid, which reduces the processing accuracy requirements of the extrusion cylinder. Since interference fit is no longer used between the layers of extrusion cylinders, it is easier to disassemble and replace the inner cylinder when it is damaged. The high-pressure relief valve 5 can be adjusted to accurately set the liquid pressure, thereby accurately controlling the value of the extrusion cylinder assembly prestress, which is more precise and controllable than the prestress generated by the existing interference fit. When the number of cylinder layers is greater than or equal to 3, the cavity 7 between each layer of cylinder can be set with different liquid pressures as needed, thereby generating prestress of different levels. When the liquid pressure in the cavity 7 of the extrusion cylinder increases due to temperature changes, the high-pressure relief valve 5 can automatically open to discharge part of the liquid to keep the liquid pressure in the cavity 7 unchanged, thereby ensuring that the assembly prestress is not affected by temperature changes.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of extrusion cylinder, characterized in that: The extrusion cylinder is a multi-layer cylinder structure, and there is an annular cavity between adjacent cylinders; A one-way liquid replenishing valve and a high-pressure relief valve are installed on the end surface of the outer cylinder of the adjacent cylinder, and the one-way liquid replenishing valve and the high-pressure relief valve are both connected with the cavity through the processed channel.

2. A novel structure extrusion cylinder according to claim 1, characterized in that: Sealing structures are installed on both side end surfaces of the extrusion cylinder to enable the cavity to be sealed.

3. A novel structure extrusion cylinder according to claim 1, characterized in that: If the number of extrusion cylinder layers is greater than or equal to 3, the cavities between the layers of cylinders are not connected to each other, and each cavity has a one-way liquid replenishing valve and a high-pressure relief valve that are individually connected to it.

4. A new type of extrusion cylinder according to claim 3, characterized in that: Different pressures are set in different cavities to produce different levels of prestress.

5. A new type of pre-tightening method for an extrusion cylinder, characterized in that: The method is applied to the new structure extrusion cylinder as described in any one of claims 1 to 4, and the pre-tightening method comprises: S1, high-pressure liquid is injected into the cavity by the one-way liquid replenishing valve, and the liquid pressure is set by the high-pressure relief valve; S2, when the cavity reaches the set pressure P1, the high-pressure relief valve opens to discharge the air; S3, when the cavity is filled with liquid, stop injecting high-pressure liquid into the one-way liquid replenishing valve; S4, after the filling is completed, the annular cavity will be filled with high-pressure liquid with a set pressure P1, generating the prestress required for the assembly of the extrusion cylinder.

6. A method for pre-tightening a new type of extrusion cylinder according to claim 5, characterized in that: The cavities between the layers of cylinders are set with different liquid pressures as required, thereby generating prestress of different levels.

7. A method for pre-tightening a novel structure extrusion cylinder according to claim 5, characterized in that: When the liquid pressure in the cavity of the extruder increases due to temperature changes, the high-pressure relief valve automatically opens to discharge part of the liquid to keep the liquid pressure in the cavity unchanged.

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