Pressure boosting and maintaining device of three-way pipe forming machine

Abstract

The utility model belongs to the field of three-way pipe manufacturing equipment, and particularly relates to a pressure boosting and maintaining device of a three-way pipe forming machine, which comprises a first cylinder body, a second cylinder body, a displacement rod, a displacement sensor, a first piston, a piston rod and a second piston. The first cylinder body and the second cylinder body are both fixed on a forming machine, and the shell diameter of the second cylinder body is smaller than that of the first cylinder body; a through hole is formed in the front end of a shell of the first cylinder body, the displacement rod can penetrate through the through hole to be fixed to the first piston, the displacement sensor is fixed to the inner wall of the shell of the first cylinder body, and the displacement rod and the displacement sensor can be matched with each other. The forming efficiency of the three-way pipe is improved, the forming quality of the branch pipe is guaranteed, and retraction is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of three-way pipe manufacturing equipment, and particularly relates to a pressure boosting and pressure maintaining device for a three-way pipe forming machine. Background Art

[0002] The general method for forming a three-way pipe is to first place the pipe blank into a mold, then simultaneously introduce water into both sides of the inner cavity of the pipe blank, and then use two horizontal side cylinders of a hydraulic press to synchronously move towards the center to extrude the pipe blank. After being extruded, the volume of the pipe blank becomes smaller, and the water in the pipe blank increases in pressure as the volume of the pipe blank decreases. When the pressure required for the expansion of the stainless steel three-way branch pipe is reached, the metal material flows along the inner cavity of the mold under the dual action of the side cylinder and the liquid pressure in the pipe blank to expand the branch pipe. However, for the branch pipe to expand, it is necessary to wait for the volume of the pipe blank to be slowly compressed and reduced, which results in a longer forming time and lower forming efficiency. Moreover, after the branch pipe expands, it needs to be kept under pressure for a certain period of time for better forming. In the existing forming method, since the volume of the pipe blank decreases slowly during the process of the horizontal side cylinder extruding the pipe blank, the pressure increases slowly. After the three-way pipe is formed, since all the water in the pipe blank has leaked out, it is impossible to maintain a high pressure on the three-way pipe for a certain period of time, and the branch pipe is prone to retraction. Summary of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the disadvantages of the existing three-way pipe forming method, such as long forming time, slow forming efficiency, and the branch pipe being prone to retraction, which is extremely likely to produce defective products.

[0004] To solve the above technical problem, the utility model provides a pressure boosting and pressure maintaining device for a three-way pipe forming machine, which includes a first cylinder body, a second cylinder body, a displacement rod, a displacement sensor, a first piston, a piston rod, and a second piston. The shell of the first cylinder body is fixedly connected in series with the shell of the second cylinder body. The first cylinder body and the second cylinder body are both fixed on the forming machine. The diameter of the shell of the second cylinder body is smaller than that of the shell of the first cylinder body;

[0005] A through hole is provided at the front end of the shell of the first cylinder body. The displacement rod can pass through the through hole and be fixed to the first piston. The displacement sensor is fixed on the inner wall of the shell of the first cylinder body, and the displacement rod and the displacement sensor can cooperate with each other;

[0006] An inlet hole is provided at the front end of the first cylinder body, and an outlet hole is provided at the rear end of the second cylinder body. A one-way valve is fixed at the rear end of the second cylinder body. The inlet of the one-way valve is communicated with the outlet hole. The one-way valve includes two outlets, and the two outlets are respectively connected to both ends of the pipe blank through two hoses;

[0007] The diameter of the first piston is larger than that of the second piston.

[0008] Further, it further includes a support frame, the support frame is horizontally fixed on one of the vertical side walls of the molding machine, and both the first cylinder body and the second cylinder body are fixed on the support frame.

[0009] Further, a first flange is provided at the rear end of the cylinder body of the first cylinder body, and a second flange is provided at the front end of the cylinder body of the second cylinder body, and the first flange and the second flange are fixedly joined together.

[0010] The technical solution of the present utility model has the following beneficial effects:

[0011] The present utility model is provided with a first cylinder body and a second cylinder body. The water that originally needed to be introduced into the inner cavity of the pipe blank is pressurized jointly by the first cylinder body and the second cylinder body, and the pressure is increased by dozens of times, and then introduced into the inner cavity of the pipe blank. Due to the combined action of the high-pressure water and the horizontal side cylinder, the branch pipe can be quickly expanded, improving the forming efficiency of the three-way pipe. Moreover, the length of the second cylinder body is just such that the piston can move a certain stroke, and this stroke meets the time length requirement for continuous pressurization, ensuring the forming of the branch pipe and avoiding retraction. Description of the Drawings

[0012] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Description of the reference numerals: 1. First cylinder body; 11. Through hole; 12. Water inlet hole; 13. First flange; 2. Second cylinder body; 21. Water outlet hole; 22. Second flange; 3. Displacement rod; 4. First piston; 5. Piston rod; 6. Second piston; 7. Displacement sensor; 8. Check valve; 9. Support frame; 20. Molding machine; 30. Pipe blank; 40. Front side rodless chamber; 50. Rear side rodless chamber.

[0014] Figure 1 It is a schematic diagram of the present utility model installed on the molding machine;

[0015] Figure 2 It is a sectional view of the present utility model;

[0016] Figure 3 It is a schematic diagram of the overall appearance of the present utility model. Specific Embodiments

[0017] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0019] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0020] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] The present utility model provides a pressure boosting and pressure maintaining device for a three-way pipe forming machine, which includes a first cylinder body 1, a second cylinder body 2, a displacement rod 3, a first piston 4, a piston rod 5, a second piston 6 and a displacement sensor 7. The shell of the first cylinder body 1 is fixedly connected in series with the shell of the second cylinder body 2. Both the first cylinder body 1 and the second cylinder body 2 are fixed on the forming machine 20. The diameter of the shell of the second cylinder body 2 is smaller than that of the shell of the first cylinder body 1. A through hole 11 is provided at the front end of the shell of the first cylinder body 1. The displacement rod 3 can pass through the through hole 11 and be fixed to the first piston 4. The displacement sensor 7 is fixed on the inner wall of the shell of the first cylinder body 1. The displacement rod 3 and the displacement sensor 7 can cooperate with each other. An inlet hole 12 is provided at the front end of the first cylinder body 1. An outlet hole 21 is provided at the rear end of the second cylinder body 2. A one-way valve 8 is fixed at the rear end of the second cylinder body 2. The inlet of the one-way valve 8 is communicated with the outlet hole 21. The one-way valve 8 includes two outlets, and the two outlets are respectively connected to both ends of the pipe blank 30 through two hoses. The diameter of the first piston 4 is larger than that of the second piston 6.

[0022] The basic working principle of the present utility model: When it is necessary to pressurize and form the pipe blank 30, water enters the front side rodless chamber 40 through the water inlet hole 12, pushing the first piston 4, the piston rod 5 and the second piston 6 to move backward. Since the area of the front side rodless chamber 40 is larger, the pressure of the water in the front side rodless chamber 40 is smaller. After the water enters the rear side rodless chamber 50, since the area of the rear side rodless chamber 50 becomes smaller, the pressure-receiving area of the water in the rear side rodless chamber 50 becomes smaller, and the pressure increases. Compared with the pressure in the front side rodless chamber 40, the pressure has increased by dozens of times. After the water with increased pressure comes out from the water outlet hole 21, it flows into the chambers at both ends of the pipe blank 30 through two hoses respectively, providing pressure for both ends of the chamber of the pipe blank 30.

[0023] The one-way valve 8 provided at the rear end of the second cylinder block 2 can prevent water from flowing back from the rear end to the front end, affecting the water pressurization effect.

[0024] When forming a three-way pipe, it is necessary to continuously apply water pressure to both ends of the chamber of the pipe blank 30 for a period of time, rather than just for an instant. Therefore, the length of the second cylinder block 2 is just such that the piston can move a stroke, and this stroke meets the requirement of the time length for continuous pressurization. The displacement sensor 7 can detect the displacement distance of the displacement rod 3 in real time, that is, the moving distance of the piston rod 5. This structural design enables the displacement sensor 7 to prevent the water inlet hole 12 from continuing to admit water after detecting that the second piston 6 has reached the maximum backward moving stroke, and there is a water return hole on the arc surface of the first cylinder block 1. The water flowing out of the water return hole causes the second piston 6 to reset to the front end of the first cylinder block 1 for the next pressurization.

[0025] The present utility model further includes a support frame 9, which is horizontally fixed on one of the vertical side walls of the forming machine 20. The first cylinder block 1 and the second cylinder block 2 are both fixed on the support frame 9. The support frame 9 is mainly used to provide a supporting and fixing platform for the first cylinder block 1 and the second cylinder block 2, preventing the first cylinder block 1 and the second cylinder block 2 from being directly fixed on the platform of the forming machine 20 and occupying the working platform for forming the three-way pipe.

[0026] The specific way of connecting the shells of the first cylinder block 1 and the second cylinder block 2 in series: The rear end of the shell of the first cylinder block 1 is provided with a first flange 13, and the front end of the shell of the second cylinder block 2 is provided with a second flange 22. The first flange 13 and the second flange 22 are fixed together by alignment.

[0027] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. The pressure boosting and maintaining device of the three-way pipe forming machine is characterized by: It comprises a first cylinder body (1), a second cylinder body (2), a displacement rod (3), a displacement sensor (7), a first piston (4), a piston rod (5), and a second piston (6); The shell of the first cylinder (1) and the shell of the second cylinder (2) are fixed together in series, the first cylinder (1) and the second cylinder (2) are both fixed on a molding machine (20), and the shell diameter of the second cylinder (2) is smaller than the shell diameter of the first cylinder (1); A through hole (11) is provided at the front end of the shell of the first cylinder body (1), the displacement rod (3) can pass through the through hole (11) and be fixed to the first piston (4), the displacement sensor (7) is fixed on the inner wall of the shell of the first cylinder body (1), and the displacement rod (3) and the displacement sensor (7) can cooperate with each other; The front end of the first cylinder (1) is provided with a water inlet (12), the rear end of the second cylinder (2) is provided with a water outlet (21), a one-way valve (8) is fixed to the rear end of the second cylinder (2), the inlet of the one-way valve (8) is connected to the water outlet (21), the one-way valve (8) includes two outlets, and the two outlets are respectively connected to the two ends of the tube blank (30) by two hoses; The diameter of the first piston (4) is greater than the diameter of the second piston (6).

2. The pressure boosting and maintaining device for a three-way pipe forming machine according to claim 1, characterized in that: It also includes a support frame (9), which is horizontally fixed on one of the vertical side walls of the molding machine (20), and the first cylinder body (1) and the second cylinder body (2) are both fixed on the support frame (9).

3. The pressure boosting and maintaining device for a three-way pipe forming machine according to claim 1, characterized in that: A first flange (13) is provided at the rear end of the shell of the first cylinder body (1), and a second flange (22) is provided at the front end of the shell of the second cylinder body (2); the first flange (13) and the second flange (22) are matched and fixed together.

Images