Annealing device for precise fastener production

Abstract

The invention provides an annealing device for precise fastener production, which comprises a support frame, a furnace shell and a furnace chamber, the upper end and the lower end of the furnace shell are respectively provided with a gas supply channel and a vacuum pump which are communicated with the furnace chamber, the furnace chamber is arranged in the furnace shell, an annealing rack mechanism is arranged in the furnace chamber, the furnace chamber comprises a furnace body, and the front end and the rear end of the annealing furnace body are respectively provided with an inner furnace door; a circulating cooling chamber and an annealing chamber are arranged in the annealing furnace body, a heating assembly is arranged on the inner wall of the annealing chamber, an automatic opening and closing mechanism is arranged on the inner furnace door, and the annealing material frame mechanism comprises a first layer frame, a second layer frame, a third layer frame, a fourth layer frame, a plurality of first-level lifting air cylinders and a plurality of second-level lifting air cylinders. The annealing furnace has the beneficial effects that through the air cooling device formed by combining the rapid cooling cavity and the air cooling system, the water cooling device formed by combining the circulating cooling cavity and the water circulating connecting end and the inner furnace door structure capable of being automatically opened, the cooling rate is accurately controlled, a temperature control curve required by annealing is met, and the annealing quality is improved. And the mechanical property of the annealed fastener is uniform.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of precision fastener production, and in particular to an annealing device for precision fastener production. Background Art

[0002] Annealing is a metal heat treatment process, which refers to a heat treatment method in which the metal is slowly heated to a certain temperature, maintained for a sufficient time, and then cooled at an appropriate speed, sometimes naturally cooled, and sometimes cooled at a controlled speed. In actual production, the annealing process is widely used. Depending on the purpose of annealing required by the workpiece, there are many annealing heat treatment processes, commonly used ones are full annealing, spheroidizing annealing, stress relief annealing, etc. The annealing process can also be divided into vacuum annealing, controlled atmosphere annealing and annealing heated in a natural atmosphere.

[0003] The vacuum annealing process refers to heating the material under high vacuum conditions. By controlling parameters such as temperature, pressure and time, the internal structure of the material changes to achieve the purpose of improving the material performance. The main principle is to eliminate the influence of gas on the material under a vacuum environment and prevent the occurrence of adverse reactions such as oxidation and sulfidation, thereby improving the purity and uniformity of the material. When the vacuum degree reaches the requirement, the material is heated and insulated. According to the properties of the material and the process requirements, the appropriate heating and cooling methods are selected to control the temperature curve, and the temperature is kept constant or increased until the annealing temperature is reached.

[0004] The inventor discovered the following defects during the operation of the specific embodiment: In the annealing furnace process, the control of the annealing temperature curve plays an important role. Therefore, in addition to the heating rate, the cooling rate has an important influence on the control of the precise temperature curve, which can reduce the cooling time and improve production efficiency. Existing annealing devices mostly use hood-type annealing furnaces, which can only control the temperature inside the annealing furnace chamber, but cannot effectively reduce the temperature inside and on the surface of the furnace shell, resulting in slow cooling speed and poor cooling rate control, affecting the annealing temperature curve, and failing to improve production efficiency and production quality.

[0005] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Summary of the invention

[0006] 1. Technical problems to be solved by the invention: The present invention provides an annealing device for producing precision fasteners, which is used to solve the technical problems existing in the above-mentioned background technology.

[0007] 2. Technical solution: To achieve the above-mentioned purpose, the technical solution provided by the present invention is: an annealing device for the production of precision fasteners, comprising a support frame, a furnace shell and a furnace chamber, the upper and lower ends of the furnace shell are respectively provided with an air supply channel and a vacuum pump connected to the furnace chamber, the furnace chamber is arranged inside the furnace shell, and an annealing rack mechanism is arranged in the furnace chamber, wherein the furnace chamber comprises a furnace body, inner furnace doors are arranged at both the front and rear ends of the annealing furnace body, a circulating cooling chamber and an annealing chamber are provided in the annealing furnace body, a heating assembly is arranged on the inner wall of the annealing chamber, an automatic opening and closing mechanism is arranged on the inner furnace door, the annealing rack mechanism comprises shelf one, shelf two, shelf three and shelf four, and a plurality of first-level lifting cylinders and second-level lifting cylinders are also arranged at a lower end of the shelf.

[0008] Furthermore, a quick cooling cavity is provided between the furnace shell and the furnace chamber, and an air cooling system connected to the quick cooling cavity is provided on one side of the furnace shell. The furnace shell includes an outer shell and two outer furnace doors arranged at the front and rear ends of the outer shell, and the outer furnace doors are provided with a water circulation connection end matching the circulating cooling chamber.

[0009] Furthermore, a water inlet and a water outlet are respectively provided at the front end of the circulating cooling chamber, and the water inlet and the water outlet are connected to the water circulation connection end through a hose, and the circulating cooling chamber has a plurality of spray heads connected to the annealing chamber.

[0010] Furthermore, the automatic opening and closing mechanism includes two hydraulic push cylinders, one end of the piston rod of the hydraulic push cylinder is sequentially provided with a steering block and a positioning block that are rotatably connected to each other, and the other end of the hydraulic push cylinder away from its piston rod is provided with a cylinder seat, and the cylinder seat is rotatably connected to the hydraulic push cylinder.

[0011] Furthermore, the inner furnace door includes a folding door leaf 1 and a folding door leaf 2, and the folding door leaf 1 and the folding door leaf 2 are connected by a hinge, one end of the cylinder seat is fixedly connected to the folding door leaf 1, and one end of the positioning block is fixedly connected to the folding door leaf 2.

[0012] Furthermore, the annealing rack mechanism also includes a plurality of guide columns, the lower ends of the plurality of guide columns are fixedly connected to the layer rack one, and the upper ends of the guide columns sequentially pass through the layer rack two, the layer rack three and the layer rack four.

[0013] Furthermore, the plurality of first-stage lifting cylinders and the second-stage lifting cylinders are arranged at the lower end of the annealing furnace body, the piston end of the first-stage lifting cylinder is connected with a push rod 1, and the plurality of push rods 1 penetrate the first shelf and are connected to the second shelf at the upper end.

[0014] Furthermore, the piston end of the secondary lifting cylinder is connected to a push rod 2, and a plurality of push rods 2 sequentially penetrate the shelf 1 and the shelf 2 and then the upper ends are connected to the shelf 3.

[0015] Furthermore, the heating assembly includes a plurality of heating tubes, which are embedded on the inner wall of the annealing chamber and have high-speed burners.

[0016] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is reasonably designed. Through the air cooling device combining the quick cooling chamber with the air cooling system, the water cooling device combining the circulating cooling chamber with the water circulation connection end, and the inner furnace door structure that can be opened automatically, the cooling rate can be accurately controlled and the temperature can be gradually reduced to meet the temperature control curve required for annealing. After annealing, the mechanical properties of the fasteners are highly uniform.

[0017] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the present invention; Figure 3 It is a schematic diagram of the furnace chamber structure of the present invention; Figure 4 It is a schematic diagram of the local structure of the furnace chamber of the present invention; Figure 5 It is a schematic diagram of the structure of the inner furnace door of the present invention; Figure 6 It is a schematic diagram of the annealing rack mechanism structure of the present invention.

[0019] Reference numerals: 1. Support frame; 2. Furnace shell; 201. Outer shell; 202. Outer furnace door; 203. Water circulation connection end; 3. Furnace chamber; 301. Furnace body; 302. Inner furnace door; 3021. Folding door leaf 1; 3022. Folding door leaf 2; 303. Circulating cooling chamber; 3031. Water inlet; 3032. Water outlet; 304. Annealing chamber; 305. Heating assembly; 306. Automatic opening and closing mechanism; 3061. Hydraulic push Moving cylinder; 3062, steering block; 3063, positioning block; 3064, cylinder seat; 4, air supply channel; 5, vacuum pump; 6, annealing rack mechanism; 601, shelf one; 602, shelf two; 603, shelf three; 604, first-level lifting cylinder; 6041, push rod one; 605, second-level lifting cylinder; 6051, push rod two; 606, shelf four; 607, guide column; 7, fast cooling chamber; 8, air cooling system. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0024] See attached Figure 1-6 An annealing device for producing precision fasteners comprises a support frame 1, a furnace shell 2 and a furnace chamber 3. The upper and lower ends of the furnace shell 2 are respectively provided with an air supply channel 4 and a vacuum pump 5 connected with the furnace chamber 3. The furnace chamber 3 is arranged inside the furnace shell 2. An annealing rack mechanism 6 is arranged in the furnace chamber 3, wherein the furnace chamber 3 comprises a furnace body 301. The front and rear ends of the annealing furnace body 301 are both provided with inner furnace doors 302. The annealing furnace body 301 has a circulating cooling chamber 303 and an annealing chamber 304. A heating component 305 is arranged on the inner wall of the annealing chamber 304. An automatic opening and closing mechanism 306 is arranged on the inner furnace door 302. The annealing rack mechanism 6 comprises a layer frame 1 601, a layer frame 2 602, a layer frame 3 603 and a layer frame 4 606. A plurality of first-level lifting cylinders 604 and a second-level lifting cylinder 605 are also arranged at the lower end of the layer frame 1 601.

[0025] See attached Figure 1-6 A quick cooling cavity 7 is provided between the furnace shell 2 and the furnace chamber 3. An air cooling system 8 connected to the quick cooling cavity 7 is provided on one side of the furnace shell 2. The air cooling system 8 is a circulating fan arranged outside the furnace shell 2. The air cooling system 8 provides circulating cold air for the quick cooling cavity 7 and replaces the gas in the furnace. The heat dissipation and cooling effect inside the furnace shell 2 and outside the furnace chamber 3 can be used to protect the furnace shell 2 and temperature-bearing components such as electrodes connected to the furnace shell 2. The furnace shell 2 includes an outer shell 201 and two outer furnace doors 202 arranged at the front and rear ends of the outer shell 201. A water circulation connection end 203 matching the circulating cooling cavity 303 is provided on the outer furnace door 202. A water inlet 3031 and a water outlet 303 are respectively provided at the front end of the circulating cooling cavity 303. 032, the water inlet 3031 and the water outlet 3032 are connected to the water circulation connection end 203 through a hose. The circulating cooling chamber 303 is provided with a plurality of spray heads connected to the annealing chamber 304. The spray heads are all made of high temperature resistant material, evenly distributed on the inner wall of the annealing chamber 304, and spaced apart from the heating component 305. According to the annealing process requirements, the spray heads are opened to spray cool the fasteners. The circulating cooling chamber 303 is an interlayer cavity arranged in the furnace chamber 3. After the chemical annealing in the furnace chamber 3 is completed, the water circulation connection end 203 is opened to supply water to the circulating cooling chamber 303. During the operation, there is always a supply of cooling water, so that the heat is quickly extracted and the furnace chamber 3 is quickly cooled.

[0026] See attached Figure 1-6 The automatic opening and closing mechanism 306 includes two hydraulic push cylinders 3061, one end of the piston rod of the hydraulic push cylinder 3061 is sequentially provided with a steering block 3062 and a positioning block 3063 which are rotatably connected to each other, and the other end of the hydraulic push cylinder 3061 away from its piston rod is provided with a cylinder seat 3064, and the cylinder seat 3064 is rotatably connected to the hydraulic push cylinder 3061. The automatic opening and closing mechanism 306 is installed on the outer side of the inner furnace door 302, and the inner furnace door 302 includes a folding door leaf 1 3021 and a folding door leaf 2 3022, and the folding door leaf 1 3021 and the folding door leaf 2 3022 are connected by hinges. The cylinder seat 3064 is connected, one end of the cylinder seat 3064 is fixedly connected to the folding door leaf 1 3021, and one end of the positioning block 3063 is fixedly connected to the folding door leaf 2 3022. The cylinder 3061 is hydraulically pushed to extend and retract, driving the steering block 3062, the positioning block 3063 and the folding door leaf 2 3022 to flip, so as to control the opening and closing of the furnace chamber 3. The half inner furnace door 302 is opened by the automatic opening and closing mechanism 306, so that the circulating cold air in the fast cooling cavity 7 enters the furnace chamber 3. With the help of the circulating water cooling inside the furnace chamber 3, the cooling rate is accurately controlled and quickly dropped to room temperature, so as to prepare a high-quality annealing process.

[0027] See attached Figure 1-6 The annealing rack mechanism 6 also includes a plurality of guide posts 607, the lower ends of the plurality of guide posts 607 are fixedly connected to the layer frame 1 601, and the upper ends of the guide posts 607 sequentially penetrate the layer frame 2 602, the layer frame 3 603 and the layer frame 4 606. The plurality of layers in the annealing rack mechanism 6 are used to place fasteners. The multi-layer structural design can improve the output. The plurality of first-level lifting cylinders 604 and the second-level lifting cylinders 605 are both arranged at the lower end of the annealing furnace body 301. The piston end of the first-level lifting cylinder 604 is connected to a push rod 1 6041. The plurality of push rods 1 6041 penetrate the layer frame 1 601 and are connected to the layer frame 2 602 at the upper end. Then, the piston end of the secondary lifting cylinder 605 is connected to a push rod 2 6051, and multiple push rods 2 6051 pass through the shelf 1 601 and the shelf 2 602 in sequence, and the upper end is connected to the shelf 3 603. During the preparation process, the shelf space can be changed by pushing the shelf 2 603 by the primary lifting cylinder 604 and the shelf 3 603 by the secondary lifting cylinder 605; the layer plate can stir the hot air flow during the lifting process, so that the hot air flow entering the furnace chamber 3 is in uniform contact with the fasteners; at the same time, during the cooling process, the cold air flow is stirred by the lifting and lowering of the layer plate, and the spray cooling is more uniform after changing the layer plate spacing, thereby improving the annealing effect.

[0028] See attached Figure 1-6The heating assembly 305 includes a plurality of heating tubes, which are embedded in the inner wall of the annealing chamber 304 and have a high-speed burner. The heating assembly 305 is ignited by an external fuel device. The plurality of heating tubes are distributed on the inner wall of the furnace chamber 3. After ignition, the plurality of high-speed burners spray fire for heating, which can quickly heat up, has a fast heating speed and good thermal insulation performance.

[0029] When in use, the water inlet 3031 and the water outlet 3032 at the front end of the circulating cooling chamber 303 are connected to the water circulation connection end 203 through a connecting hose. The water circulation connection end 203 is externally connected to a water pump device, and the circulating cooling chamber 303 is provided with circulated cooling water through the external device; the gas supply channel 4 is connected to the gas source device, and the gas source is a protective gas, including but not limited to hydrogen or a hydrogen-nitrogen mixed gas as a protective gas. The gas flow rate is controlled by a configured control system to improve the heat transfer efficiency; the heating component 305 is ignited by an external fuel device and heated by a high-speed burner spray; Before starting the work, the fasteners to be annealed are placed on multiple shelves of the annealing rack mechanism 6, first close the inner furnace door 302 at the front and rear ends of the furnace chamber 3, then close the outer furnace door 202 at the front and rear ends of the furnace shell 2, then start the vacuum pump 5, evacuate the furnace chamber 3, introduce protective gas, start the heating component 305, select different annealing temperature curves according to different fastener materials, and control the temperature by alternating heating and cooling until the annealing temperature curve meets the process requirements; After annealing is completed, the air cooling system 8, the water circulation connection end 203, and the inner furnace door 302 are opened alternately or simultaneously to control the cooling rate in the furnace chamber 3 until it cools to room temperature.

[0030] In this embodiment, through the air cooling device combining the fast cooling chamber 7 and the air cooling system 8, the water cooling device combining the circulating cooling chamber 303 and the water circulation connection end 203, and the automatically openable inner furnace door 302 structure configured in the technical solution, the cooling rate can be accurately controlled and the temperature can be gradually reduced to meet the temperature control curve required for annealing, and the mechanical properties of the fasteners after annealing are highly uniform.

[0031] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An annealing device for producing precision fasteners, comprising a support frame (1), a furnace shell (2) and a furnace chamber (3), characterized in that: The furnace shell (2) is provided with an air supply channel (4) and a vacuum pump (5) respectively at the upper and lower ends thereof, the furnace chamber (3) being arranged inside the furnace shell (2), an annealing material rack mechanism (6) being arranged inside the furnace chamber (3), wherein the furnace chamber (3) comprises a furnace body (301), the front and rear ends of the annealing furnace body (301) are provided with inner furnace doors (302), and the annealing furnace body (301) has a circulating cooling chamber (303) inside. ) and an annealing chamber (304), the inner wall of the annealing chamber (304) being provided with a heating component (305), the inner furnace door (302) being provided with an automatic opening and closing mechanism (306), the annealing material rack mechanism (6) comprising a first rack (601), a second rack (602), a third rack (603) and a fourth rack (606), and a plurality of first-level lifting cylinders (604) and a second-level lifting cylinder (605) being provided at the lower end of the first rack (601).

2. The annealing device for producing precision fasteners according to claim 1, characterized in that: A quick cooling cavity (7) is provided between the furnace shell (2) and the furnace chamber (3); an air cooling system (8) connected to the quick cooling cavity (7) is provided on one side of the furnace shell (2); the furnace shell (2) comprises an outer shell (201) and two outer furnace doors (202) arranged at the front and rear ends of the outer shell (201); and a water circulation connection end (203) matching the circulation cooling cavity (303) is provided on the outer furnace door (202).

3. The annealing device for producing precision fasteners according to claim 2, characterized in that: A water inlet (3031) and a water outlet (3032) are respectively provided at the front end of the circulating cooling chamber (303); the water inlet (3031) and the water outlet (3032) are connected to the water circulation connection end (203) via a hose; and a plurality of spray heads connected to the annealing chamber (304) are provided in the circulating cooling chamber (303).

4. The annealing device for producing precision fasteners according to claim 1, characterized in that: The automatic opening and closing mechanism (306) comprises two hydraulic push cylinders (3061), one end of the piston rod of the hydraulic push cylinder (3061) is provided with a steering block (3062) and a positioning block (3063) which are rotatably connected to each other in sequence, and the other end of the hydraulic push cylinder (3061) away from its piston rod is provided with a cylinder seat (3064), and the cylinder seat (3064) is rotatably connected to the hydraulic push cylinder (3061).

5. The annealing device for producing precision fasteners according to claim 4, characterized in that: The inner furnace door (302) comprises a folding door leaf 1 (3021) and a folding door leaf 2 (3022), wherein the folding door leaf 1 (3021) and the folding door leaf 2 (3022) are connected via a hinge, one end of the cylinder seat (3064) is fixedly connected to the folding door leaf 1 (3021), and one end of the positioning block (3063) is fixedly connected to the folding door leaf 2 (3022).

6. The annealing device for producing precision fasteners according to claim 1, characterized in that: The annealing rack mechanism (6) further comprises a plurality of guide columns (607), the lower ends of the plurality of guide columns (607) being fixedly connected to the first rack (601), and the upper ends of the guide columns (607) sequentially passing through the second rack (602), the third rack (603) and the fourth rack (606).

7. The annealing device for producing precision fasteners according to claim 1, characterized in that: The plurality of first-stage lifting cylinders (604) and the plurality of second-stage lifting cylinders (605) are arranged at the lower end of the annealing furnace body (301); the piston end of the first-stage lifting cylinder (604) is connected to a push rod 1 (6041); and the plurality of push rods 1 (6041) penetrate through the first shelf (601) and are connected to the second shelf (602) at their upper ends.

8. The annealing device for producing precision fasteners according to claim 1, characterized in that: The piston end of the secondary lifting cylinder (605) is connected to a push rod 2 (6051), and a plurality of push rods 2 (6051) sequentially penetrate the layer frame 1 (601), the layer frame 2 (602), and the upper end thereof is connected to the layer frame 3 (603).

9. The annealing device for producing precision fasteners according to claim 1, characterized in that: The heating component (305) comprises a plurality of heating tubes, which are embedded on the inner wall of the annealing chamber (304) and have high-speed burners.

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