Annular zinc oxide resistor disc forming device

Abstract

The utility model relates to the technical field of zinc oxide resistor disc manufacturing, in particular to an annular zinc oxide resistor disc forming device which comprises a supporting block, a pressing machine upper plate and a pressing machine lower plate are arranged at the lower end of the supporting block, an upper pressing sleeve is connected to an upper flange of the pressing machine upper plate, and a lower pressing sleeve is connected to an upper flange of the pressing machine lower plate. A plurality of upper punches are uniformly arranged on the upper pressing sleeve, a plurality of lower punches corresponding to the upper punches are arranged on the lower pressing sleeve, and mold cores are arranged in the lower punches, so that the problems of waste of blank forming raw materials, incomplete pre-burning glue discharging and poor parameter performance in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of zinc oxide resistor manufacturing, in particular to a ring-shaped zinc oxide resistor forming device. Background Art

[0002] The core component of zinc oxide lightning arrester, the resistor, is made of zinc oxide resistor. The powder used is subjected to spray granulation and moisture-containing processes before entering the molding process. Currently, zinc oxide varistor ceramics are widely formed by dry pressing. The principle is relatively simple: powder with appropriate moisture content is injected into a suitable steel mold. The upper and lower dies are moved slowly relative to each other with the help of hydraulic transmission force. After exhausting and maintaining pressure, the dispersed and accumulated powder can be pressed into a green body that meets the requirements.

[0003] The following factors should be considered in the design of mold dimensions: (1) After demolding, the size of the green body increases due to the elastic aftereffect. When the pressing pressure is removed, the green body expands due to the relaxation of elastic stress, which is called the elastic aftereffect; (2) The radial shrinkage of the green body during firing. The size of the firing shrinkage is mainly determined by the green body density and firing temperature; (3) The dimensional tolerance of the green body. The height of the inner cavity of the mold sleeve should be determined based on the loose density of the powder and the maximum size of the green body, and the bottom mold plug should be maintained at a certain depth in the mold cavity.

[0004] At present, most of the molding devices in my country's industry are pie-shaped molds, and a large amount of raw materials are wasted in the molding of the embryo. Since the embryo is solid, the pre-burning and debinding are not thorough, and the parameter performance is poor. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the utility model provides a ring-shaped zinc oxide resistor forming device, which effectively solves the problems of the prior art in terms of the waste of raw materials for embryonic body forming, incomplete pre-firing and debinding, and poor parameter performance.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is:

[0007] A ring-shaped zinc oxide resistor forming device includes a support block, a press upper plate and a press lower plate are provided at the lower end of the support block, an upper press sleeve is flange-connected to the upper press plate, a lower press sleeve is flange-connected to the lower press plate, a plurality of upper punches are evenly arranged on the upper press sleeve, a plurality of lower punches corresponding to the upper punches are provided on the lower press sleeve, and a mold core is provided in the lower punch.

[0008] Preferably, the upper punch and the upper pressing sleeve are connected by fixing bolts, and the upper punch is hollow, and the inner hollow diameter is the same as the diameter of the mold core.

[0009] Preferably, the mold core is located at the center of the lower punch, and the mold core is connected to the lower punch by bolts.

[0010] Preferably, a pair of supporting slide bars are fixedly connected between the lower plate of the press and the support block, and the supporting slide bars are slidably connected to both ends of the upper plate of the press respectively.

[0011] Preferably, an upper oil cylinder is installed on the support block, and the output end of the upper oil cylinder is drivingly connected to the upper plate of the press.

[0012] The utility model has novel structure, ingenious design, simple and convenient operation, and has the following advantages compared with the existing technology:

[0013] When the utility model is used, a ring-shaped forming mold is designed to press the zinc oxide resistor. After the green sheet is pressed out of the mold, the total area of ​​the upper and lower end surfaces is greatly reduced. During the pre-burning and binder removal process, the internal gas is more easily discharged, and the performance of various parameters is significantly improved. After the area of ​​the green sheet is reduced, the efficiency of the grinding and aluminum spraying process is also greatly improved, and the cost of auxiliary tooling is reduced. The ring-shaped resistor takes into account all the characteristics of the pancake-shaped resistor, and the lightning arrester produced also takes into account the function of the insulator, and the two products are integrated into one. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the main view of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the lower punch and die core of the utility model;

[0016] Figure 3 This is a structural diagram of the upper pressure sleeve of the utility model;

[0017] Figure 4 This is a structural diagram of the lower pressure sleeve of the utility model;

[0018] Figure 5 It is a cross-sectional view of the upper punch of the utility model;

[0019] Numbers in the figure: 1. Support block; 2. Upper plate of press; 3. Support slide bar; 4. Upper pressing sleeve; 5. Upper oil cylinder; 6. Lower punch; 7. Die core; 8. Lower pressing sleeve; 9. Lower plate of press; 10. Upper punch. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0021] like Figure 1-5As shown, a ring-shaped zinc oxide resistor forming device includes a support block 1, a press upper plate 2 and a press lower plate 9 are provided at the lower end of the support block 1, an upper press sleeve 4 is connected to the upper flange of the press upper plate 2, and a lower press sleeve 8 is connected to the upper flange of the press lower plate 9. A plurality of upper punches 10 are evenly arranged on the upper press sleeve 4, and a plurality of lower punches 6 corresponding to the upper punches 10 are provided on the lower press sleeve 8, and a mold core 7 is provided in the lower punch 6.

[0022] When the utility model is in use, the mold core 7 and the lower punch 6 form an annular mold cavity, and the powder material is placed in the annular mold cavity. The upper plate 2 of the press fixes the upper pressing sleeve 4. During the downward movement of the upper plate 2 of the press, the upper pressing sleeve 4 drives the upper punch 10 to move downward, and the powder material in the annular mold cavity is pressed into an annular resistor sheet.

[0023] The upper punch 10 and the upper pressing sleeve 4 are connected by fixing bolts, and the upper punch 10 is hollow, and the inner hollow diameter is the same as the diameter of the mold core 7.

[0024] like Figure 5 and 4 As shown, the upper punch 10 and the upper pressing sleeve 4 are connected together by fixing bolts. The upper punch 10 is hollow, and the inner hollow diameter is the same as the diameter of the mold core 7, ensuring that the upper punch 10 presses the powder material in the annular mold cavity formed by the mold core 7 and the lower punch 6.

[0025] The mold core 7 is located at the center of the lower punch 6 , and the mold core 7 is bolted to the lower punch 6 .

[0026] like Figure 2 and 4 As shown, the mold core 7 is located at the center of the lower punch 6, thereby forming an annular mold cavity for pressing out the annular resistor sheet.

[0027] A pair of support slide bars 3 are fixedly connected between the press lower plate 9 and the support block 1 , and the support slide bars 3 are slidably connected to both ends of the press upper plate 2 respectively.

[0028] like Figure 1 As shown, the support slide bar 3 plays a role in limiting the sliding of the upper plate 2 of the press.

[0029] An upper oil cylinder 5 is installed on the support block 1 , and an output end of the upper oil cylinder 5 is drivingly connected to the upper plate 2 of the press.

[0030] like Figure 1 As shown, the output end of the upper oil cylinder 5 is fixed to the upper plate 2 of the press, and the output end of the upper oil cylinder 5 is used to provide a driving force for pressing the upper plate 2 of the press downward.

[0031] When the utility model is in use, the powder material is placed in the annular die cavity, the upper plate 2 of the press plays a fixing role on the upper pressing sleeve 4, the output end of the upper oil cylinder 5 is fixed to the upper plate 2 of the press, and the output end of the upper oil cylinder 5 is used to provide a driving force for pressing the upper plate 2 of the press downward. During the downward movement of the upper plate 2 of the press, the upper pressing sleeve 4 drives the upper punch 10 to move downward, and the powder material in the annular die cavity is pressed into an annular resistor sheet.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitute similar methods to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A ring-shaped zinc oxide resistor forming device, comprising a support block (1), characterized in that: The support block (1) is provided with a press upper plate (2) and a press lower plate (9) at the lower end thereof; an upper press sleeve (4) is connected to the upper flange of the press upper plate (2); a lower press sleeve (8) is connected to the upper flange of the press lower plate (9); a plurality of upper punches (10) are evenly arranged on the upper press sleeve (4); a plurality of lower punches (6) corresponding to the upper punches (10) are arranged on the lower press sleeve (8); and a die core (7) is arranged in the lower punch (6).

2. The annular zinc oxide resistor forming device according to claim 1, characterized in that: The upper punch (10) and the upper pressing sleeve (4) are connected by fixing bolts, and the upper punch (10) is hollow inside, and the inner hollow diameter is the same as the diameter of the mold core (7).

3. The annular zinc oxide resistor forming device according to claim 1, characterized in that: The mold core (7) is located at the center of the lower punch (6), and the mold core (7) is bolted to the lower punch (6).

4. The annular zinc oxide resistor forming device according to claim 1, characterized in that: A pair of support slide bars (3) are fixedly connected between the press lower plate (9) and the support block (1), and the support slide bars (3) are respectively slidably connected to both ends of the press upper plate (2).

5. The annular zinc oxide resistor forming device according to claim 4, characterized in that: An upper oil cylinder (5) is mounted on the support block (1), and an output end of the upper oil cylinder (5) is drivingly connected to the upper plate (2) of the press.

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