Extrusion oil cylinder structure and cast aluminum die

Abstract

The utility model provides an extrusion oil cylinder structure and a cast aluminum die, the extrusion oil cylinder structure comprises a shell, a piston assembly and a connecting shaft, the shell comprises a first shell body and a second shell body, the first shell body and the second shell body are detachably connected in a sealing mode and define a piston cavity, one end of the piston assembly slides in the piston cavity, and the other end of the piston assembly slides in the connecting shaft; the other end of the piston assembly penetrates out of the second shell and is used for being connected with a device to be extruded, one end of the connecting shaft is connected to the bottom wall of the first shell, the connecting shaft slidably penetrates through the piston assembly, the piston assembly divides the piston cavity into a first cavity and a second cavity, the first shell is provided with a first liquid inlet channel communicated with the first cavity, and the second shell is provided with a second liquid inlet channel communicated with the second cavity. The second shell is provided with a second liquid inlet channel communicating with the second cavity. Thus, the first shell and the second shell are arranged to be of a detachable structure, so that the extrusion oil cylinder structure is time-saving, labor-saving, convenient and rapid to disassemble and assemble, and the extrusion oil cylinder structure can be conveniently and regularly overhauled.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum casting molds, and in particular to an extrusion cylinder structure and an aluminum casting mold. Background Art

[0002] In the cast aluminum die-casting manufacturing of the workpiece (the front aluminum end ring of the cast aluminum rotor of the motor), heat shrinkage holes and air holes often occur, which leads to low density of the workpiece and affects the yield rate of the workpiece. Therefore, the patent with application number 202322195517.8 discloses an extrusion molding device for the front end ring of the cast aluminum rotor of the motor to solve the above problems. The extrusion molding device for the front end ring of the cast aluminum rotor of the motor includes a front mold core, an extrusion needle assembly and a cylinder assembly. An extrusion hole is opened on the front mold core of the front end ring of the cast aluminum rotor of the motor, and the extrusion needle assembly is driven by the cylinder assembly to drive the extrusion needle to move, so that the die-casting aluminum liquid in the extrusion hole is squeezed into the front mold core, so as to increase the density of the front end ring of the cast aluminum rotor of the motor after molding and improve the yield rate.

[0003] Among them, the cylinder structure includes a shell, a piston in the shell, and the piston includes a movable sleeve (i.e., a piston rod) and a piston plate. The movable sleeve is sleeved on a shaft body for connecting the front model core, and the piston plate is annularly sleeved on the movable sleeve, and divides the internal space of the shell into two oil filling chambers, and the reciprocating motion of the piston is achieved by alternately filling oil in the two chambers; however, the shell of the cylinder structure adopts an integrated structure, and the cross-sectional area of ​​the piston plate is larger than the cross-sectional area of ​​the through hole on the shell for the movable sleeve to pass through. When disassembling and installing the piston, the elasticity of the piston plate is required for disassembly and installation, which makes the disassembly and assembly of the cylinder structure time-consuming and labor-intensive, and brings inconvenience to the regular maintenance of the cylinder structure. Utility Model Content

[0004] The present disclosure provides an extrusion cylinder structure and an aluminum casting mold to at least solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, the present disclosure provides the following technical solutions: an extrusion cylinder structure, comprising:

[0006] The housing comprises a first shell and a second shell, wherein the first shell and the second shell are detachably sealed and connected to each other and enclose a piston cavity;

[0007] A piston assembly, one end of which slides in the piston cavity, and the other end of which passes through the second housing and is used to connect to a device to be extruded;

[0008] A connecting shaft, one end of which is connected to the bottom wall of the first shell, and the connecting shaft is slidably arranged in the piston assembly, the piston assembly separates the piston cavity into a first chamber and a second chamber, the first shell is provided with a first liquid inlet channel connected to the first chamber, and the second shell is provided with a second liquid inlet channel connected to the second chamber.

[0009] In one embodiment, the piston assembly comprises:

[0010] A piston head is slidably disposed in the piston cavity, and a side wall of the piston head is in contact with a cavity wall of the piston cavity, and the piston head separates the piston cavity into the first cavity and the second cavity;

[0011] A piston rod, one end of which is connected to the piston head, the other end of which passes through the second housing, and the piston head and the piston rod are an integrated structure; wherein,

[0012] The connecting shaft is slidably disposed in turn on the piston head and the piston rod.

[0013] In one possible implementation manner, the piston assembly further comprises a connecting piece, the connecting piece is threadedly connected to the piston rod and is used to connect to a device to be extruded, and the connecting piece is sleeved on the connecting shaft.

[0014] In one embodiment, a guide groove is provided on the inner wall surface of the bottom wall of the first shell, and the piston assembly also includes a guide column, one end of which is detachably connected to the side of the piston head away from the piston rod, and the other end of the guide column is slidably inserted in the guide groove.

[0015] In one possible implementation manner, the piston head is sealed to the cavity wall of the piston cavity via a first sealing ring, and the piston head is sealed to the connecting shaft via a second sealing ring.

[0016] In one possible implementation manner, the piston rod is movably disposed in the second housing, and the piston rod and the second housing are sealed and connected via a third sealing ring.

[0017] In one embodiment, the first shell is threadedly connected to the second shell, and the first shell and the second shell are sealed by a fourth sealing ring.

[0018] In one embodiment, a threaded hole is configured on the bottom wall of the first shell, and the threaded hole is connected to the inside and outside of the piston chamber along the movement direction of the piston assembly. One end of the connecting shaft is configured with an external thread, and the external thread is screwed into the internal thread of the threaded hole. The connecting shaft is also sealed and connected to the first shell via a fifth sealing ring.

[0019] In one embodiment, a locking hole is further provided on the outer end surface of the bottom wall of the first shell, and the locking hole is arranged along the radial direction of the threaded hole and is connected to the locking hole. The extrusion cylinder structure also includes a locking piece, which is clamped in the locking hole, and a part of the locking piece extends into the threaded hole and is used to tighten against one end of the connecting shaft.

[0020] The present disclosure provides the following technical solution: an aluminum casting mold, comprising the above-mentioned extrusion cylinder structure.

[0021] In the above-mentioned extrusion cylinder structure, during assembly, one end of the connecting shaft is first fixed to the bottom wall of the first shell, and the piston assembly is sleeved on the connecting shaft, and then the second shell is installed on the first shell, that is, the assembly of the extrusion cylinder assembly is realized; during disassembly, the second shell is first removed from the first shell, and then the piston assembly is taken out along the connecting shaft, that is, the disassembly of the extrusion cylinder assembly is realized, so as to facilitate regular maintenance of the piston assembly; during operation, extrusion oil is introduced into the first chamber through the first liquid inlet channel to drive the piston assembly to perform the extrusion action, and extrusion oil is introduced into the second chamber through the second liquid inlet channel to drive the piston assembly to reset, thereby realizing stable driving of the extrusion device to be extruded; in this way, by setting the first shell and the second shell as a detachable structure, the disassembly and assembly of the extrusion cylinder structure is time-saving and labor-saving, convenient and quick, so as to facilitate regular maintenance of the extrusion cylinder structure.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0024] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0025] Figure 1 A schematic diagram of the structure of the extrusion cylinder structure in an embodiment of the present disclosure is shown;

[0026] Figure 2 Shows Figure 1 A cross-sectional view along the II-II direction;

[0027] Figure 3 Shows Figure 1 Schematic diagram of the exploded structure of the piston assembly;

[0028] Figure 4 Shows Figure 1 A schematic diagram of the exploded structure of the first housing and the connecting shaft;

[0029] Figure 5 Shows Figure 1 Schematic diagram of the exploded structure of the middle shell and locking parts.

[0030] Description of the numbers in the figure:

[0031] In the figure: 11, outer shell; 111, first shell; 112, second shell; 113, piston chamber; 1131, first chamber; 1132, second chamber; 114, first liquid inlet channel; 115, second liquid inlet channel; 116, guide groove; 117, third sealing ring; 118, fourth sealing ring; 119, locking hole; 12, piston assembly; 121, piston head; 122, piston rod; 123, connecting piece; 124, guide column; 125, first sealing ring; 126, second sealing ring; 13, connecting shaft; 14, fifth sealing ring; 15, locking piece. DETAILED DESCRIPTION

[0032] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0033] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The following is a description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0036] Please also read Figure 1 and Figure 2 The embodiment of the present disclosure provides an extrusion cylinder structure, which includes a housing 11, a piston assembly 12 and a connecting shaft 13. The housing 11 includes a first shell 111 and a second shell 112. The first shell 111 and the second shell 112 are detachably sealed and enclosed to form a piston cavity 113. One end of the piston assembly 12 slides in the piston cavity 113, and the other end of the piston assembly 12 passes through the second shell 112 and is used to connect to a device to be extruded. Specifically, the device to be extruded is an extrusion needle assembly. One end of the connecting shaft 13 The end is connected to the bottom wall of the first shell 111, and the connecting shaft 13 can be slidably penetrated in the piston assembly 12. Specifically, a through hole is provided on the piston assembly 12, and the connecting shaft 13 can be slidably penetrated in the piston assembly 12 along the through hole. The piston assembly 12 separates the piston cavity 113 into a first chamber 1131 and a second chamber 1131. The first shell 111 is provided with a first liquid inlet channel 114 connected to the first chamber 1131, and the second shell 112 is provided with a second liquid inlet channel 115 connected to the second chamber 1131.

[0037] In the above-mentioned extrusion cylinder structure, during assembly, one end of the connecting shaft 13 is first fixed to the bottom wall of the first housing 111, and the piston assembly 12 is sleeved on the connecting shaft 13, and then the second housing 112 is installed on the first housing 111, that is, the assembly of the extrusion cylinder assembly is realized; during disassembly, the second housing 112 is first removed from the first housing 111, and then the piston assembly 12 is taken out along the connecting shaft 13, that is, the disassembly of the extrusion cylinder assembly is realized, so as to facilitate regular maintenance of the piston assembly 12; during operation, extrusion oil is introduced into the first chamber 1131 through the first liquid inlet channel 114 to drive the piston assembly 12 to perform the extrusion action, and extrusion oil is introduced into the second chamber 1131 through the second liquid inlet channel 115 to drive the piston assembly 12 to reset, thereby realizing stable driving of the extrusion device to be extruded; in this way, by setting the first housing 111 and the second housing 112 as a detachable structure, the disassembly and assembly of the extrusion cylinder structure is time-saving and labor-saving, and convenient and quick, so as to facilitate regular maintenance of the extrusion cylinder structure.

[0038] See also Figure 3In some embodiments, the piston assembly 12 includes a piston head 121 and a piston rod 122. The piston head 121 is slidably disposed in the piston cavity 113, and the side wall of the piston head 121 is in contact with the cavity wall of the piston cavity 113. The piston head 121 isolates the piston cavity 113 into a first chamber 1131 and a second chamber 1131. One end of the piston rod 122 is connected to the piston head 121, and the other end of the piston rod 122 passes through the second housing 112. The piston head 121 and the piston rod 122 are an integrated structure. Specifically, a portion of the through hole is configured on the piston head 121, and the other portion of the through hole is configured on the piston rod 122. The connecting shaft 13 is slidably disposed on the piston head 121 and the piston rod 122 in sequence along the through hole.

[0039] In this way, by designing the piston head 121 and the piston rod 122 as an integrated structure, the piston head 121 and the piston rod 122 can be fixed before the piston assembly 12 is assembled into the housing 11. Specifically, the piston head 121 and the piston rod 122 can form an integrated structure by welding, casting, forging or machine tool processing.

[0040] Specifically, the piston head 121 and the piston rod 122 are coaxially arranged, and the diameter of the piston head 121 is larger than the diameter of the piston rod 122. Through holes are opened on the piston rod 122 and the piston head 121. The two through holes are connected to form a through hole, and the connecting shaft 13 can be slidably penetrated in the piston head 121 and the piston rod 122 along the two through holes in turn.

[0041] See also Figure 3 In some embodiments, the piston assembly 12 also includes a connecting piece 123, which is threadedly connected to the piston rod 122 and is used to connect the device to be extruded, and the connecting piece 123 is sleeved on the connecting shaft 13. In this way, by directly threading the connecting piece 123 to the piston rod 122, the connecting piece 123 can be quickly connected to further improve the disassembly and assembly efficiency of the extrusion cylinder.

[0042] In this embodiment, a through hole is provided on the connecting member 123, and the through hole passes through the connecting member 123 along the axial direction of the connecting shaft 13. An internal thread is provided on a portion of the hole wall of the through hole close to the piston rod 122, and an external thread screwed into the internal thread is provided on the piston rod 122. Alternatively, an external thread is provided on the outer periphery of one end of the connecting member 123 toward the piston rod 122, and an internal thread screwed into the external thread is provided on the inner wall of the through hole on the piston rod 122.

[0043] Furthermore, the connecting member 123 includes a connecting tube and a protruding edge, one end of the connecting tube is provided with an external thread, the protruding edge is provided at the other end of the connecting tube and protrudes from the connecting tube in the radial direction of the connecting tube, and the protruding edge is used to connect the device to be extruded.

[0044] See also Figure 4 In some embodiments, a guide groove 116 is formed on the inner wall surface of the bottom wall of the first shell 111, and the piston assembly 12 also includes a guide column 124, one end of which is detachably connected to the side of the piston head 121 away from the piston rod 122, and the other end of the guide column 124 is slidably inserted into the guide groove 116.

[0045] In this way, the guide groove 116 and the guide column 124 guide the piston head 121 and the piston rod 122 to move stably along the axial direction of the connecting shaft 13 of the guide groove 116, thereby improving the stability of the piston assembly 12 during movement and making the force of the piston assembly 12 when pushing against the extrusion device more uniform.

[0046] In this embodiment, the guide post 124 is threadedly connected to a side of the piston head 121 away from the piston rod 122 , so as to improve the installation efficiency of the guide post 124 .

[0047] Please also read Figure 2 and Figure 3 In some embodiments, the piston head 121 and the cavity wall of the piston cavity 113 are sealed by a first sealing ring 125, and the piston head 121 and the connecting shaft 13 are sealed by a second sealing ring 126; in this way, the piston head 121 and the wall of the piston cavity 113 are sealed by the first sealing ring 125 to prevent the extruded oil in the first chamber 1131 from flowing into the second chamber 1131 along the gap between the piston head 121 and the wall of the piston cavity 113, or to prevent the extruded oil in the second chamber 1131 from flowing into the first chamber 1131 along the gap between the piston head 121 and the wall of the piston cavity 113, and the piston head 121 and the connecting shaft 13 are sealed by the second sealing ring 126 to prevent the extruded oil from flowing out along the gap between the piston head 121 and the connecting shaft 13 when the piston head 121 slides along the connecting shaft 13.

[0048] In this embodiment, the first sealing ring 125 is embedded in the outer wall of the piston head 121, and the second sealing ring 126 is embedded in the inner wall of the piston head 121. The number of the first sealing ring 125 can be multiple, and the number of the second sealing ring 126 can be multiple.

[0049] See also Figure 2 In some embodiments, the piston rod 122 is movably disposed in the second housing 112, and the piston rod 122 and the second housing 112 are sealed and connected via a third sealing ring 117; thus, the piston rod 122 and the second housing 112 are sealed via the third sealing ring 117 to prevent the squeezed oil in the second chamber 1131 from flowing out along the gap between the piston rod 122 and the second housing 112.

[0050] In this embodiment, the third sealing ring 117 is embedded in the piston rod 122 or embedded in the second housing 112 , and the number of the third sealing ring 117 can be multiple.

[0051] Please also read Figure 2 and Figure 5 In some embodiments, the first shell 111 and the second shell 112 are both circular structures, the first shell 111 is threadedly connected to the second shell 112, and the first shell 111 and the second shell 112 are sealed by a third sealing ring 118; in this way, the threaded connection between the first shell 111 and the second shell 112 is sealed by the third sealing ring 118 to prevent the extruded oil in the piston chamber 113 from flowing out along the threaded gap between the first shell 111 and the second shell 112.

[0052] See also Figure 5 In this embodiment, the first shell 111 is provided with an external thread, and the second shell 112 is provided with an internal thread screwed into the external thread. Accordingly, the first shell 111 surrounds the top cavity wall and the side cavity wall of the piston cavity 113, and the second shell 112 surrounds the bottom cavity wall of the piston cavity 113. Alternatively, the first shell 111 is provided with an internal thread, and the second shell 112 is provided with an external thread screwed into the internal thread. Accordingly, the first shell 111 surrounds the top cavity wall of the piston cavity 113, and the second shell 112 surrounds the side cavity wall and the bottom cavity wall of the piston cavity 113.

[0053] In this embodiment, the number of the third sealing rings 118 is two.

[0054] See also Figure 4 In some embodiments, a threaded hole is configured on the bottom wall of the first shell 111, and the threaded hole is connected to the inside and outside of the piston chamber 113 along the movement direction of the piston assembly 12, and is coaxially arranged with the piston chamber 113. One end of the connecting shaft 13 is configured with an external thread, and the external thread is screwed into the internal thread of the threaded hole, and the connecting shaft 13 is also sealed and connected to the first shell 111 through a fifth sealing ring 14.

[0055] In this way, the connecting shaft 13 and the first shell 111 are connected by threads to facilitate the quick disassembly and assembly of the connecting shaft 13, wherein the connecting shaft 13 is used to position and fix the extrusion cylinder structure to the front mold core of the cast aluminum mold. At the same time, the threaded connection between the connecting shaft 13 and the first shell 111 is sealed by the fifth sealing ring 14 to prevent the extruded liquid in the piston chamber 113 from flowing out along the threaded connection.

[0056] See also Figure 5In some embodiments, a locking hole 119 is further provided on the outer end surface of the bottom wall of the first shell 111. The locking hole 119 is arranged along the radial direction of the threaded hole and is connected to the locking hole 119. The extrusion cylinder structure also includes a locking piece 15. The locking piece 15 is clamped in the locking hole 119, and a part of the locking piece 15 extends into the threaded hole and is used to tighten against one end of the connecting shaft 13; specifically, the locking piece 15 is an elastic piece.

[0057] In this way, by inserting the locking member 15 into the locking hole 119 and allowing a portion of the locking member 15 to extend into the threaded hole and press against the connecting shaft 13, the threaded shaft is prevented from rotating under the touch of external force or vibration, causing the connecting shaft 13 to loosen.

[0058] The working principle of the above-mentioned extrusion cylinder structure is roughly as follows:

[0059] The extrusion oil is introduced into the first chamber 1131 through the first liquid inlet channel 114 to drive the piston head 121 to move a preset distance in the axial direction of the connecting shaft 13, and the piston head 121 drives the piston rod 122 and the connecting member 123 to move a preset distance synchronously to generate an extrusion force on the extrusion device to complete the extrusion action;

[0060] Extrusion oil is introduced into the second chamber 1131 through the second liquid inlet channel 115 to drive the piston head 121 to move a preset distance in the opposite axial direction of the connecting shaft 13. The piston head 121 drives the piston rod 122 and the connecting rod to move synchronously a preset distance to reset the piston assembly 12. By alternately injecting extrusion oil into the first chamber 1131 and the second chamber 1131, the reciprocating motion of the piston assembly 12 is realized, thereby realizing continuous operation of the extrusion cylinder structure.

[0061] The disclosed embodiment also provides an aluminum casting mold, including the above-mentioned extrusion cylinder structure, wherein the connecting shaft 13 is connected to the front mold core, and the connecting piece 123 is connected to the extrusion needle assembly, so that the piston head 121 is driven by the extrusion cylinder assembly to drive the piston rod 122 and the connecting piece 123 to move axially along the connecting shaft 13, and the connecting piece 123 pushes the extrusion needle assembly to extrude the cast aluminum liquid along the extrusion hole on the front mold core to the inside of the front mold core, so as to reduce the bubbles in the cast aluminum workpiece in the aluminum casting mold, thereby improving the yield rate of the cast aluminum workpiece.

[0062] It is understandable that the products processed by the present invention should not be limited to the front end ring of the cast aluminum rotor of the motor, and other cast aluminum workpieces can also be produced and processed using the cast aluminum mold of the present invention.

[0063] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An extrusion cylinder structure, characterized in that: include: The housing comprises a first shell and a second shell, wherein the first shell and the second shell are detachably sealed and connected to each other and enclose a piston cavity; A piston assembly, one end of which slides in the piston cavity, and the other end of which passes through the second housing and is used to connect to a device to be extruded; A connecting shaft, one end of which is connected to the bottom wall of the first housing, and the connecting shaft is slidably disposed in the piston assembly; wherein, The piston assembly separates the piston cavity into a first chamber and a second chamber. The first shell is provided with a first liquid inlet channel connected to the first chamber, and the second shell is provided with a second liquid inlet channel connected to the second chamber.

2. The extrusion cylinder structure according to claim 1, characterized in that: The piston assembly comprises: A piston head is slidably disposed in the piston cavity, and a side wall of the piston head is in contact with a cavity wall of the piston cavity, and the piston head separates the piston cavity into the first cavity and the second cavity; A piston rod, one end of which is connected to the piston head, the other end of which passes through the second housing, and the piston head and the piston rod are an integrated structure; wherein, The connecting shaft is slidably disposed in turn on the piston head and the piston rod.

3. The extrusion cylinder structure according to claim 2, characterized in that: The piston assembly also includes a connecting piece, which is threadedly connected to the piston rod and used to connect to the device to be extruded, and the connecting piece is sleeved on the connecting shaft.

4. The extrusion cylinder structure according to claim 2, characterized in that: A guide groove is provided on the inner wall surface of the bottom wall of the first shell, and the piston assembly also includes a guide column, one end of which is detachably connected to the side of the piston head away from the piston rod, and the other end of the guide column is slidably inserted in the guide groove.

5. The extrusion cylinder structure according to claim 2, characterized in that: The piston head is sealed to the cavity wall of the piston cavity via a first sealing ring, and the piston head is sealed to the connecting shaft via a second sealing ring.

6. The extrusion cylinder structure according to claim 2, characterized in that: The piston rod is movably arranged in the second housing, and the piston rod and the second housing are sealed and connected via a third sealing ring.

7. The extrusion cylinder structure according to claim 1, characterized in that: The first shell is threadedly connected to the second shell, and the first shell and the second shell are sealed and connected via a fourth sealing ring.

8. The extrusion cylinder structure according to claim 1, characterized in that: A threaded hole is arranged on the bottom wall of the first shell, and the threaded hole is connected to the inside and outside of the piston chamber along the movement direction of the piston assembly. One end of the connecting shaft is arranged with an external thread, and the external thread is screwed into the internal thread of the threaded hole. The connecting shaft is also sealed and connected to the first shell via a fifth sealing ring.

9. The extrusion cylinder structure according to claim 8, characterized in that: A locking hole is also provided on the outer end surface of the bottom wall of the first shell, and the locking hole is arranged along the radial direction of the threaded hole and is connected to the locking hole. The extrusion cylinder structure also includes a locking piece, which is clamped in the locking hole, and a part of the locking piece extends into the threaded hole and is used to tighten against one end of the connecting shaft.

10. An aluminum casting mold, characterized in that: It comprises the extrusion cylinder structure as described in any one of claims 1 to 9.

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