Special internal tooth piston mold blank for door closer

Abstract

The utility model discloses a special internal tooth piston die blank for a door closer, which comprises a main body, a middle section is arranged on the surface of the main body, a bone position groove is arranged at the bottom of the main body, and a through hole is arranged in an inner cavity of the main body. According to the internal tooth piston mold blank special for the door closer, the middle section and the inner cavity through hole are formed in the surface of the main body through the cold extrusion process, the process enables the piston mold blank to reduce the mass of a traditional piston, save materials and save machining time, the precision of cold-extruded materials is better, the size is stable, and the problems that the machining process is complex, and the machining cost is low are solved. And a large amount of manpower and energy are needed for operation, so that the manufacturing cost of the door closer is high.

Description

Technical Field

[0001] The utility model relates to the technical field of door closers, in particular to an internal gear piston die blank specially used for door closers. Background Art

[0002] The door closer, whose full name is modern hydraulic door closer, is a spring-like hydraulic device on the door head and is installed on the top of the door leaf. The working principle of the door closer is: when the door is opened, the door body drives the connecting rod to move, and the gear rotates and engages with the meshing teeth on the door closer piston to drive the door closer piston to move to the right. In the process of the door closer piston moving to the right, the spring is compressed, and the hydraulic oil in the right chamber is also pressurized. The steel ball valve (equivalent to a one-way valve) of the door closer piston opens under the action of oil pressure, and the hydraulic oil in the right chamber flows to the left chamber through the steel ball valve. When the door opening process is completed, the spring is released due to the compression force during the opening process, pushing the door closer piston to the left, driving the gear and the door closer connecting rod to rotate, and closing the door.

[0003] The piston of the existing door closer is formed by turning, milling, grinding and other processes on the die blank steel, forged steel or cast steel to form the oil hole, one-way valve and teeth on the piston. The processing technology is relatively complicated and requires a lot of manpower and energy to operate, which makes the production cost of the door closer high. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a mold blank for an internal gear piston of a door closer, which solves the problem that the processing technology is complicated and requires a lot of manpower and energy to operate, thereby making the production cost of the door closer high.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a mold blank specially used for an internal gear piston of a door closer, comprising a main body, a middle section is arranged on the surface of the main body, a bone groove is arranged on the bottom of the main body, and a through hole is arranged in the inner cavity of the main body.

[0006] Preferably, the cross section of the main body is circular.

[0007] Preferably, the cross section of the middle section is elliptical.

[0008] Preferably, the inner cavity of the through hole is larger at one end and smaller at the other end, and the through holes are interconnected.

[0009] Beneficial Effects

[0010] The utility model provides a mold blank for an internal gear piston of a door closer. Compared with the prior art, it has the following beneficial effects:

[0011] 1. This is a die blank for the inner gear of the door closer. Through the cold extrusion process, the middle section and the inner cavity through hole are formed on the surface of the main body. The process enables the piston die blank to reduce the volume of the traditional piston, save materials, and save processing time. The cold extruded material has better precision and stable size. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a cross-sectional view of the structure of the utility model.

[0014] In the figure: 1, main body; 2, middle section; 3, bone slot; 4, through hole. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-2 The utility model provides a technical solution: a mold blank specially used for an internal gear piston of a door closer, comprising a main body 1, the cross section of the main body 1 is circular, the main body 1 is processed into a circle, a middle section 2 is arranged on the surface of the main body 1, the cross section of the middle section 2 is elliptical, a bone groove 3 is arranged at the bottom of the main body 1, the bone groove 3 is a groove, wherein the bone groove 3 is used for processing and positioning, the inner cavity of the main body 1 is provided with a through hole 4, the inner cavity of the through hole 4 is large at one end and small at the other end, and they are interconnected.

[0017] The piston mold blank preparation method is as follows:

[0018] S1. First, a preliminary model of the main body 1 is extruded by cold extrusion so that its cross section is circular and there is a shallow groove in the middle of one end;

[0019] S2, the second step is to extrude and lengthen the lower section by extruding the shallow groove in step S1, and a bone position groove 3 is also opened at the bottom;

[0020] S3, the circular shallow groove in step S2 is extruded to reduce the diameter, and the closing part becomes a small hole, and the shallow groove forms a through hole 4;

[0021] S4, cutting the middle surface in step S3 into a middle section 2, and hollowing out the middle of the middle section 2 to form an inner tooth groove;

[0022] S5. Finally, in step S4, the inner wall is hollowed out and broached to draw out the required shape of internal teeth.

[0023] The above-mentioned cold extrusion process can reduce the volume of the traditional piston, save materials, and save processing time. The cold extruded material has better precision and stable size.

[0024] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A mold blank for an internal gear piston of a door closer, comprising a main body (1), characterized in that: The surface of the main body (1) is provided with a middle section (2), the bottom of the main body (1) is provided with a bone slot (3), and the inner cavity of the main body (1) is provided with a through hole (4); The cross section of the main body (1) is circular, the cross section of the middle section (2) is elliptical, the bone slot (3) is a groove, and the inner cavity of the through hole (4) is larger at one end and smaller at the other end, and the two are interconnected.

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