Follow-up reverse-pushing perforating needle positioning mechanism for seamless tube profile extruding machine

Abstract

The follow-up reverse-pushing perforating needle positioning mechanism comprises a main driving part, an auxiliary driving part, a containing barrel and an extrusion die, the driving end of the main driving part is connected with an extrusion rod, the auxiliary driving part is arranged in the main driving part, the driving end of the auxiliary driving part is connected with a perforating needle and a conjugate ejector rod, and the conjugate ejector rod is arranged in the containing barrel. A through material cavity is formed in the material containing barrel, the extrusion die is arranged in the material cavity, one end of the extrusion rod is in sliding connection with the material cavity, a discharging hole is formed in the extrusion die, the diameter of the perforating needle is smaller than the inner diameter of the discharging hole, and the perforating needle penetrates through the extrusion rod and is coaxial with the discharging hole. The conjugate ejector rod penetrates through the driving end of the main driving piece and is opposite to the material containing barrel. Compared with the prior art, the ejector rod reverse thrust mechanical positioning is more accurate, the relative static accurate matching between the outer die and the inner die is completely achieved without displacement all the time, a stable extrusion working belt is formed, the mechanism is completely hidden in the inner cavity of the plunger of the main oil cylinder, the whole machine structure is more concise, and repair and maintenance are less.

Description

Technical Field

[0001] The present application belongs to the technical field of extruders, and more specifically, relates to a follow-up reverse-thrust piercing needle positioning mechanism for a seamless tube profile extruder. Background Art

[0002] The most critical technology of the forward (reverse) double-acting extruder (mainly used for the extrusion of aluminum or copper seamless pipes) lies in the dynamic and precise positioning of the piercing needle (inner mold) and the outer mold to form an extrusion working zone to meet the extrusion process requirements.

[0003] The traditional method is to use the auxiliary hydraulic mechanism to push the piercing needle and the main hydraulic cylinder of the extruder to move equidistantly in the opposite direction during the extrusion process, so as to achieve the relative static and non-shifting coordination between the outer mold (mold) and the inner mold (piercing needle). To achieve the above functions, full hydraulic control is very difficult. Due to the non-absolute linear relationship between the flow rate and pressure of the hydraulic oil and the displacement of the hydraulic rod, it is difficult to achieve the relative static coordination between the outer mold and the inner mold, which greatly affects the stability of the extrusion and the geometric dimensions of the profile.

[0004] The conventional forward (reverse) double-acting extruder adopts an auxiliary hydraulic mechanism + external mechanical guide limit mode, which generally has a longer machine frame, a more complex structure, and a very large machine. The cost is more than 1.5 times that of an ordinary single-acting forward extruder of the same tonnage (nominal extrusion force). In view of this, it is necessary to improve the extruder in the conventional technology. Summary of the invention

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a follow-up reverse-thrust piercing needle positioning mechanism for a seamless tube profile extruder, comprising a main driving member, an auxiliary driving member, a material holding barrel and an extrusion die, the driving end of the main driving member is connected to an extrusion rod, the auxiliary driving member is arranged in the main driving member, the driving end of the auxiliary driving member is connected to a piercing needle and a conjugate push rod, the material holding barrel is provided with a penetrating material cavity, the extrusion die is arranged in the material cavity, one end of the extrusion rod is slidably connected to the material cavity, a discharge hole is provided on the extrusion die, the diameter of the piercing needle is smaller than the inner diameter of the discharge hole, the piercing needle passes through the extrusion rod and is coaxially arranged with the discharge hole, and the conjugate push rod passes through the driving end of the main driving member and is arranged opposite to the material holding barrel.

[0006] Optionally, the main driving component includes a main oil cylinder and a main piston rod, the extrusion rod is fixedly connected to the main piston rod, and the auxiliary driving component is located in the main piston rod.

[0007] Optionally, the auxiliary driving member includes an auxiliary oil cylinder and an auxiliary piston rod, the piercing needle is fixedly connected to the auxiliary piston rod, and the conjugate ejector rod is fixedly connected to the auxiliary piston rod for abutting against the end surface of the material containing barrel.

[0008] Optionally, there are multiple conjugate push rods, which are centrally symmetrically arranged with the perforating needle as the center.

[0009] Optionally, it also includes a front beam plate and a rear beam plate, the front beam plate is fixedly connected to the rear beam plate through an extruder pull rod, the rear beam plate is fixedly connected to the main driving component, the material holding barrel is fixedly connected to the front beam plate, and the front beam plate is provided with an opening corresponding to the position of the material cavity.

[0010] The beneficial effects of the follow-up reverse push piercing needle positioning mechanism for a seamless tube profile extruder provided in the present application are:

[0011] 1. The present application adopts a built-in auxiliary hydraulic cylinder and a conjugate push rod reverse thrust positioning mechanism. The push rod reverse thrust mechanical positioning is more accurate, and the relative static precise matching between the outer mold and the inner mold (punching needle) is fully realized without displacement, forming a stable extrusion working zone. Moreover, the mechanism is completely hidden in the inner cavity of the plunger of the main oil cylinder, making the overall structure of the machine simpler and requiring less repair and maintenance.

[0012] 2. This application greatly reduces the cost of the forward (reverse) double-acting extruder. Through equipment modification and application, this application only increases the cost of the existing forward (reverse) double-acting extruder by 2% (under 1000 tons of extrusion force), 1% (under 2000 tons of extrusion force), and 0.5% (over 2000 tons of extrusion force).

[0013] 3. This application greatly simplifies the complexity of the mechanical structure and control technology of the whole machine, greatly reduces the use cost (tools and molds) and maintenance cost of the equipment, makes the process simpler, the operation more convenient, the product quality more stable, and realizes the extrusion production of seamless pipes.

[0014] 4. For the original common forward single-acting extruder, the present invention can realize the transformation of the forward single-acting into the forward (reverse) double-acting extrusion function without changing the main structure, only by processing a few original parts on the basis of the original machine, and adding a little cost (mainly the structural assembly). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of a follow-up reverse-thrust piercing needle positioning mechanism for a seamless tube profile extruder provided in an embodiment of the present application;

[0017] Among them, the reference numerals in the figure are:

[0018] 1. Main oil cylinder; 2. Main piston rod; 3. Auxiliary oil cylinder; 4. Auxiliary piston rod; 5. Extrusion rod; 6. Conjugate ejector rod; 7. Punching needle; 8. Material holding barrel; 9. Extrusion material; 10. Extrusion die; 11. Front beam plate; 12. Extruder tie rod; 13. Rear beam plate. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] See also Figure 1 Now, the follow-up reverse thrust piercing needle positioning mechanism for a seamless tube profile extruder provided in an embodiment of the present application is described.

[0024] A follow-up reverse-thrust piercing needle 7 positioning mechanism for a seamless pipe profile extruder comprises a main driving member, an auxiliary driving member, a material holding barrel 8 and an extrusion die 10, wherein the driving end of the main driving member is connected to an extrusion rod 5, the auxiliary driving member is arranged in the main driving member, the driving end of the auxiliary driving member is connected to the piercing needle 7 and a conjugate push rod 6, a penetrating material cavity is arranged on the material holding barrel 8, the extrusion die 10 is arranged in the material cavity, one end of the extrusion rod 5 is slidably connected to the material cavity, a discharge hole is arranged on the extrusion die 10, the diameter of the piercing needle 7 is smaller than the inner diameter of the discharge hole, the piercing needle 7 passes through the extrusion rod 5 and is coaxially arranged with the discharge hole, and the conjugate push rod 6 passes through the driving end of the main driving member and is arranged opposite to the material holding barrel 8.

[0025] The auxiliary drive pushes the piercing needle 7 (inner mold) and the conjugate push rod 6 to move. The piercing needle 7 passes through the extrusion material 9 and cooperates with the extrusion die 10 (outer mold) to form an extrusion working belt. At this time, the conjugate push rod 6 also supports the material barrel 8; then the main drive pushes the extrusion rod 5 to apply extrusion force to the extrusion material 9, and the semi-solid extrusion material 9 is extruded from the working belt to form a seamless tube profile material. Since the auxiliary drive is fixed to the driving end of the main drive, it will inevitably move with the driving end of the main drive, causing the piercing needle 7 to move, but since the conjugate push rod 6 supports the stationary material barrel 8, the reverse thrust of the conjugate push rod 6 causes the driving end of the auxiliary drive to move backward. Therefore, during the extrusion of the extruded material 9, the piercing needle 7 and the conjugate push rod 6 are always stationary, ensuring that the piercing needle 7 and the extrusion die 10 form a stable and accurate extrusion working belt, realizing the function of positive double-action extrusion.

[0026] In another embodiment of the present application, if the conjugate push rod 6 passes through the material barrel 8 (a hole is drilled in the material barrel 8 corresponding to the position of the conjugate push rod 6) and presses against the die seat (not shown in the figure, fixed on the front beam plate 11), it can be achieved that when the main driving part of the extruder pushes the material barrel 8 to move, the conjugate push rod 6 drives the piercing needle 7 to move in the opposite direction, ensuring that the piercing needle 7 and the extrusion die 10 are precisely matched to form a stable extrusion working belt, thereby realizing the function of reverse double-action extrusion.

[0027] In some embodiments of the present application, the extrusion material 9 is a pre-punched (or machined) aluminum rod. If the cylinder diameter of the auxiliary drive component is large enough (that is, the hydraulic pressure is large enough), the online punching forward (reverse) extrusion function can be realized.

[0028] In some embodiments of the present application, the main drive member includes a main oil cylinder 1 and a main piston rod 2, the extrusion rod 5 is fixedly connected to the main piston rod 2, and the auxiliary drive member is located inside the main piston rod 2. The main oil cylinder 1 can drive the main piston rod 2 to move, and the main piston rod 2 can drive the auxiliary drive member fixedly connected thereto to move synchronously, so as to achieve the precise coordination of the relative stillness of the outer mold (i.e., the extrusion mold 10) and the inner mold (i.e., the piercing needle 7). And the auxiliary drive member is completely hidden in the inner cavity of the main piston rod 2, making its overall structure simpler and requiring less repair and maintenance.

[0029] In some embodiments of the present application, the auxiliary driving component includes an auxiliary oil cylinder 3 and an auxiliary piston rod 4, the piercing needle 7 is fixedly connected to the auxiliary piston rod 4, and the conjugate push rod 6 is fixedly connected to the auxiliary piston rod 4 for abutting the end surface of the material barrel 8.

[0030] The auxiliary piston rod 4 pushes the piercing needle 7 (inner mold) and the conjugate push rod 6 (integrally formed with the piercing needle 7) to move, and the piercing needle 7 passes through the extrusion material 9 (a hollow aluminum rod is used in this embodiment) and cooperates with the extrusion die 10 (outer mold) to form an extrusion working belt. At this time, the conjugate push rod 6 simultaneously supports the material holding barrel 8; then the main piston rod 2 pushes the extrusion rod 5 to apply extrusion force to the aluminum rod (temperature of about 500°C), and extrude the semi-solid aluminum material from the working belt to form a seamless tube profile material. Since the auxiliary oil cylinder 3 is fixed on the main piston rod 2, it moves with the main piston rod 2, thereby driving the piercing needle 7 to move. However, since the conjugate push rod 6 supports the stationary material holding barrel 8, the reverse thrust of the conjugate push rod 6 causes the auxiliary piston rod 4 (relative to the main piston rod 2) to move backward. Therefore, during the extrusion of the aluminum rod, the piercing needle 7 and the conjugate push rod 6 are always stationary, ensuring that the piercing needle 7 and the extrusion die 10 form a stable and accurate extrusion working zone, realizing the function of forward double-action extrusion. The function of reverse double-action extrusion has been described above, so it will not be repeated here.

[0031] In some embodiments of the present application, there are multiple conjugate push rods 6, which are centrally symmetrically arranged with the punching needle 7 as the center.

[0032] In some embodiments of the present application, the number of conjugate push rods 6 is 2, which are symmetrically arranged on both sides of the punching needle 7. Optionally, the number of conjugate push rods 6 can also be set to 3, 4, 5, etc., which are centrally symmetrically arranged with the punching needle 7 as the center.

[0033] In some embodiments of the present application, see Figure 1 , and also includes a front beam plate 11 and a rear beam plate 13. The front beam plate 11 is fixedly connected to the rear beam plate 13 through an extruder tie rod 12, the rear beam plate 13 is fixedly connected to the main driving member, the material holding barrel 8 is fixedly connected to the front beam plate 11, and the front beam plate 11 is provided with an opening corresponding to the position of the material cavity.

[0034] The front beam plate 11 and the rear beam plate 13 are used to fix the main oil cylinder 1 and the extrusion die 10 so that the positions of the two do not change. After being extruded, the extruded material 9 can be extruded from the opening set on the front beam plate 11.

[0035] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A follow-up reverse push perforating needle positioning mechanism for a seamless tube profile extruder, characterized in that: It includes a main driving member, an auxiliary driving member, a material holding barrel and an extrusion die, the driving end of the main driving member is connected to an extrusion rod, the auxiliary driving member is arranged in the main driving member, the driving end of the auxiliary driving member is connected to a piercing needle and a conjugate push rod, the material holding barrel is provided with a penetrating material cavity, the extrusion die is arranged in the material cavity, one end of the extrusion rod is slidably connected to the material cavity, the extrusion die is provided with a discharge hole, the diameter of the piercing needle is smaller than the inner diameter of the discharge hole, the piercing needle passes through the extrusion rod and is coaxially arranged with the discharge hole, the conjugate push rod passes through the driving end of the main driving member and is arranged opposite to the material holding barrel.

2. The follow-up reverse thrust piercing needle positioning mechanism for a seamless tube profile extruder according to claim 1, characterized in that: The main driving component comprises a main oil cylinder and a main piston rod, the extrusion rod is fixedly connected to the main piston rod, and the auxiliary driving component is located in the main piston rod.

3. The follow-up reverse thrust piercing needle positioning mechanism for a seamless tube profile extruder according to claim 2, characterized in that: The auxiliary driving member comprises an auxiliary oil cylinder and an auxiliary piston rod, the piercing needle is fixedly connected to the auxiliary piston rod, and the conjugate ejector rod is fixedly connected to the auxiliary piston rod for abutting against the end surface of the material containing barrel.

4. The follow-up reverse thrust piercing needle positioning mechanism for a seamless tube profile extruder according to claim 3, characterized in that: The number of the conjugate push rods is multiple and they are centrally symmetrically arranged with the punching needle as the center.

5. The follow-up reverse thrust piercing needle positioning mechanism for a seamless tube profile extruder according to claim 1, characterized in that: It also includes a front beam plate and a rear beam plate, wherein the front beam plate is fixedly connected to the rear beam plate through an extruder pull rod, the rear beam plate is fixedly connected to the main driving component, the material holding barrel is fixedly connected to the front beam plate, and the front beam plate is provided with an opening corresponding to the position of the material cavity.

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