Blank holder for end socket of pressure vessel

Abstract

The utility model discloses a blank holder for an end socket of a pressure vessel, relates to the related field of pressure vessels, and aims to solve the problems that the blank is stressed, stretched and deformed under the action of a male die and a female die, so that the middle position and the peripheral position of the blank are stretched, deformed and stressed differently, but the blank is pressed and fixed by the blank holder. In order to achieve the tensile deformation effect, the acting force needs to be increased, and the acting effect of the blank holder is weakened. An upper-layer inner blank holder is arranged in the upper-layer outer blank holder, and a lower-layer blank holder is arranged at the lower ends of the upper-layer outer blank holder and the upper-layer inner blank holder; and the lower-layer blank holder comprises a third main ring body, rectangular grooves are formed in the inner side of the lower end face of the third main ring body in an annular array mode, auxiliary rotating rollers are rotationally connected into the rectangular grooves, and the auxiliary rotating rollers rotate inwards.

Description

Technical Field

[0001] The utility model relates to the relevant field of pressure vessels, in particular to a pressure ring for a pressure vessel head. Background Art

[0002] The end cap is an indispensable and important component of pressure vessel equipment in many industries, from petrochemicals, atomic energy to food and pharmaceuticals. It refers to the element used to seal the end of the container to isolate the internal and external media. It is a major pressure-bearing component of the pressure vessel, also known as the end cap. The function of the end cap is sealing; first, it is made into the upper and lower bottoms of the tank-shaped pressure vessel, and second, the pipeline has reached the end and is not going to extend forward, so a end cap is used to seal the pipe by welding. The end cap of a cylindrical container is generally a rotating shell. According to the shape of the end cap surface, it can be divided into convex, conical, flat and combined shapes. A convex end cap refers to an end cap with a convex outer surface, such as a hemispherical, elliptical, dish-shaped and spherical end cap without folding edges.

[0003] During deep drawing, the flat blank of the pressure vessel head is subjected to the tensile force transmitted by the die to the side wall of the cylinder, and moves from the periphery to the center, and the diameter gradually decreases, and this part of the metal is pressed against each other. When the thickness of the slab is small and the degree of deep drawing deformation is large, under the action of compressive stress, the flat flange part of the workpiece will become unstable and wrinkled. In order to prevent wrinkling and ensure the quality of the deep drawing part, a blank holder is often provided in the deep drawing die. The blank holder presses the periphery of the blank to prevent the edge of the workpiece from becoming unstable and wrinkling.

[0004] Working principle: The hydraulic cylinder provides a constant pressure through the push rod. Because the small push column has a series of length changes, when the small push column transmits force to the upper layer, different areas of the upper layer will produce different elastic deformations, thereby causing different areas of the upper layer to produce different pressing forces, achieving the purpose of partitioned pressing.

[0005] The main purpose of the blank holder is to press the periphery of the blank to stabilize it. Since the blank will be stretched and deformed under the action of the punch and die, the stretching and deformation forces in the middle and outer positions of the blank are different. However, the blank holder has a fixed pressure on the blank and always maintains a strong resistance to the stretching force. In order to achieve the stretching deformation effect, the force needs to be increased to weaken the effect of the blank holder. Utility Model Content

[0006] The utility model aims to provide a pressure vessel head clamp to solve the problem raised in the above-mentioned background technology that the blank is stretched and deformed under the action of the punch and the die, resulting in different stretching deformation forces at the middle and outer positions of the blank, but the pressure of the blank is fixed by the pressure ring, and it always maintains a strong resistance to the stretching force. In order to achieve the stretching deformation effect, it is necessary to increase the force, so that the effect of the pressure ring is weakened.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure ring for a pressure vessel head, comprising an upper outer pressure ring, an upper inner pressure ring is arranged inside the upper outer pressure ring, and a lower pressure ring is arranged at the lower ends of the upper outer pressure ring and the upper inner pressure ring;

[0008] The lower layer pressure edge ring includes a third ring body, and a rectangular groove is opened in an inner ring array on the lower end surface of the third ring body. An auxiliary rotating roller is rotatably connected in the rectangular groove, and the auxiliary rotating roller rotates inward.

[0009] Preferably, the upper outer pressure ring comprises a first ring body, an inner annular groove is provided in the middle of the inner surface of the first ring body, and the upper inner pressure ring comprises a second ring body, which is clamped in the inner annular groove.

[0010] Preferably, an inner trapezoidal ring is fixed on the inner side of the upper end of the third ring body, the auxiliary rotating roller is located on the inner trapezoidal ring, a trapezoidal ring groove is provided on the upper end surface of the inner trapezoidal ring, and the cross section of the trapezoidal ring groove is set to be trapezoidal.

[0011] Preferably, an outer trapezoidal ring is fixed to the upper end of the third ring body along the outer side of the inner trapezoidal ring.

[0012] Preferably, a deformation space is formed between the inner trapezoidal ring and the outer trapezoidal ring along the upper end of the third ring body.

[0013] Preferably, first push rods are fixed in an annular array on the upper end of the first circle body, and second push rods are fixed in an annular array on the upper end of the second circle body, and the number of the second push rods is less than the number of the first push rods.

[0014] Preferably, a first middle through groove is formed through the middle of the second ring body, and a second middle through groove is formed through the middle of the third ring body, and the diameters of the first middle through groove and the second middle through groove are consistent.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In the utility model, the processed blank is pressed into the die under the action of the punch, and the auxiliary rotating roller always keeps in contact with the upper end surface of the processed blank to be formed. Because the processed blank at the lower end of the auxiliary rotating roller is pressed into the die, the auxiliary rotating roller rotates while in contact with the upper end surface of the processed blank, without hindering the pressing of the processed blank until the stretching is completed. The pressure effect of this part on the processed blank is small, and because of the rotatability of the auxiliary rotating roller, it does not resist the stretching effect of the processed blank, and will not always maintain a strong resistance to the stretching force, but assists in the stretching deformation in the middle area, which solves the problem that the blank is subjected to different forces in the middle and outer positions of the blank due to the force of the blank being stretched and deformed under the action of the punch and the die, but the blank pressure on the blank is fixed, and it always maintains a strong resistance to the stretching force. In order to achieve the stretching deformation effect, it is necessary to increase the force, so that the effect of the blank pressure ring is weakened.

[0017] 2. In the utility model, an outer trapezoidal ring is fixed on the outer periphery of the upper end of the third ring body, and an inner trapezoidal ring is fixed on the inner periphery of the upper end of the third ring body, and a trapezoidal ring groove is provided on the inner trapezoidal ring, so that under the same pressure, the deformation amplitude of the inner trapezoidal ring is larger, but the pressure effect on the lower end structure is smaller, so that the outer periphery pressure of the processed blank is greater than the inner periphery pressure, which can better prevent the edge of the processed blank from becoming unstable and wrinkling due to tensile deformation, so that the defective rate of the formed pressure vessel head is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a blank holder ring for a pressure vessel head according to the utility model;

[0019] Figure 2 It is a structural schematic diagram of an upper outer blank holder ring of a blank holder ring for a pressure vessel head according to the utility model;

[0020] Figure 3 It is a structural schematic diagram of an upper inner pressure ring of a pressure vessel head pressure ring of the utility model;

[0021] Figure 4 It is a structural schematic diagram of a lower layer blank holder ring of a blank holder ring for a pressure vessel head according to the utility model;

[0022] Figure 5 It is a cross-sectional view of a lower layer blank holder of a blank holder for a pressure vessel head according to the utility model;

[0023] Figure 6 The utility model is a bottom view of a lower layer of a pressure vessel head pressure ring.

[0024] In the figure: 1. upper outer pressure ring; 101. first ring body; 102. first push rod; 103. inner annular groove; 2. upper inner pressure ring; 201. second ring body; 202. second push rod; 203. first middle through groove; 3. lower pressure ring; 301. third ring body; 302. outer trapezoidal ring; 303. inner trapezoidal ring; 304. trapezoidal annular groove; 305. second middle through groove; 306. deformation space; 307. rectangular groove; 308. auxiliary rotating roller. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] See also Figure 1-6 The utility model provides an embodiment: a pressure ring for a pressure vessel head, comprising an upper outer pressure ring 1, an upper inner pressure ring 2 is arranged inside the upper outer pressure ring 1, and a lower pressure ring 3 is arranged at the lower ends of the upper outer pressure ring 1 and the upper inner pressure ring 2;

[0027] The upper outer pressure ring 1 comprises a first ring body 101, an inner annular groove 103 is provided in the middle of the inner surface of the first ring body 101, and the upper inner pressure ring 2 comprises a second ring body 201, the second ring body 201 is stuck in the inner annular groove 103, and a first middle through groove 203 is provided in the middle of the second ring body 201;

[0028] The lower layer pressing edge ring 3 includes a third ring body 301, a second middle through groove 305 is opened through the middle of the third ring body 301, the diameter of the first middle through groove 203 is consistent with that of the second middle through groove 305, and a rectangular groove 307 is opened in the inner ring array of the lower end surface of the third ring body 301, and an auxiliary rotating roller 308 is rotatably connected in the rectangular groove 307, and the auxiliary rotating roller 308 rotates inward. In actual production, the protruding part of the lower end surface of the auxiliary rotating roller 308 is smaller, and the outer side of the lower end surface of the third ring body 301 is arranged lower than the inner lower end surface, that is, the lower end surface of the third ring body 301 is not completely horizontal.

[0029] The blank to be formed is placed between the blank holder and the die, and the blank holder is fixed (a fixing ring is provided at the upper end of the outer periphery of the upper outer blank holder 1, and a hole is opened on the fixing ring so that it can be fixed to the external structure, or fixing pages are fixed at the upper ends of both sides of the upper outer blank holder 1, and holes are opened on the fixing pages. This part is a commonly used fixing scheme and is not limited to the shape of the fixed structure and the matching installation position), and the auxiliary rotating roller 308 on the lower blank holder 3 contacts the upper end surface of the blank to be formed;

[0030] During stretching, the workpiece to be formed is pressed into the die under the action of the punch, and the auxiliary rotating roller 308 always maintains contact with the upper end surface of the workpiece to be formed. Because the workpiece at the lower end of the auxiliary rotating roller 308 is pressed into the die, the auxiliary rotating roller 308 rotates while in contact with the upper end surface of the workpiece until the stretching is completed.

[0031] An inner trapezoidal ring 303 is fixed on the inner side of the upper end of the third ring body 301, and the auxiliary rotating roller 308 is located on the inner trapezoidal ring 303. A trapezoidal ring groove 304 is opened on the upper end surface of the inner trapezoidal ring 303, and the cross-section of the trapezoidal ring groove 304 is set to be trapezoidal; an outer trapezoidal ring 302 is fixed on the upper end of the third ring body 301 along the outer side of the inner trapezoidal ring 303; a deformation space 306 is formed between the inner trapezoidal ring 303 and the outer trapezoidal ring 302 along the upper end of the third ring body 301.

[0032] Under the same pressure, the deformation amplitude of the inner trapezoidal ring 303 is larger, but the pressure effect on the lower end structure is smaller, so that the outer periphery pressure of the processed blank is greater than the inner periphery pressure, which can better prevent the edge of the processed blank from becoming unstable and wrinkling due to tensile deformation, so that the defective rate of the formed pressure vessel head is lower.

[0033] Furthermore, a first push rod 102 is fixed in a circular array on the upper end of the first circle body 101, and a second push rod 202 is fixed in a circular array on the upper end of the second circle body 201. The number of second push rods 202 is less than the number of first push rods 102, so that there is a difference in the force transmitted downward from the inside and the outside, and the outside is fixed more stably, while a certain deformation and stretching space is left on the inside.

[0034] It is obvious 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A blank holder for a pressure vessel head, comprising an upper outer blank holder (1), characterized in that: An upper inner pressure ring (2) is arranged inside the upper outer pressure ring (1), and a lower pressure ring (3) is arranged at the lower ends of the upper outer pressure ring (1) and the upper inner pressure ring (2); The lower layer pressure edge ring (3) comprises a third ring body (301), and a rectangular groove (307) is provided in an inner ring array on the lower end surface of the third ring body (301). An auxiliary rotating roller (308) is rotatably connected in the rectangular groove (307), and the auxiliary rotating roller (308) rotates inward.

2. The blank holder for a pressure vessel head according to claim 1, characterized in that: The upper outer pressure ring (1) comprises a first ring body (101), an inner annular groove (103) is provided in the middle of the inner surface of the first ring body (101), and the upper inner pressure ring (2) comprises a second ring body (201), and the second ring body (201) is stuck in the inner annular groove (103).

3. The blank holder for a pressure vessel head according to claim 1, characterized in that: An inner trapezoidal ring (303) is fixed on the inner side of the upper end of the third ring body (301), the auxiliary rotating roller (308) is located on the inner trapezoidal ring (303), and a trapezoidal ring groove (304) is provided on the upper end surface of the inner trapezoidal ring (303), and the cross section of the trapezoidal ring groove (304) is set to be trapezoidal.

4. The blank holder for a pressure vessel head according to claim 3, characterized in that: An outer trapezoidal ring (302) is fixed to the upper end of the third ring body (301) along the outer side of the inner trapezoidal ring (303).

5. The blank holder for a pressure vessel head according to claim 4, characterized in that: A deformation space (306) is formed between the inner trapezoidal ring (303) and the outer trapezoidal ring (302) along the upper end of the third ring body (301).

6. The blank holder for a pressure vessel head according to claim 2, characterized in that: The first ring body (101) is fixed with first push rods (102) in a circular array on the upper end, and the second ring body (201) is fixed with second push rods (202) in a circular array on the upper end, and the number of the second push rods (202) is less than the number of the first push rods (102).

7. The blank holder for a pressure vessel head according to claim 2, characterized in that: A first middle through groove (203) is formed through the middle of the second ring body (201), and a second middle through groove (305) is formed through the middle of the third ring body (301). The diameters of the first middle through groove (203) and the second middle through groove (305) are consistent.

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