Connecting cover structure for vacuum quenching furnace

Abstract

The utility model relates to the technical field of heat treatment, and discloses a connecting cover structure for a vacuum quenching furnace, which comprises a tank body, a first cover body arranged above the tank body, a second cover body arranged above the first cover body, the first cover body and the second cover body are connected through two sealing rings, an air cylinder assembly is connected above the second cover body through an air cylinder shaft, and the air cylinder assembly is connected with an air cylinder. According to the sealing device, the second cover body and the first cover body are automatically covered and pressed through the air cylinder assembly, the sealing rings are evenly stressed, the integrity of the sealing rings is guaranteed, the anti-aging performance of the outer sealing ring is kept for a longer time through blocking of the inner sealing ring, the sealing effect is good, and the service life of the sealing device is prolonged. The working time of the connecting cover structure is prolonged; the main body is driven by the air cylinder to be lifted upwards along the axial direction of the air cylinder, the air release core in the third connecting part is jacked up by air pressure in the tank body, air is discharged through the air release hole, pressure release of the tank body is completed, manual operation is not needed in the pressure release process, and the risk of scalding caused by close contact with a high-temperature furnace body is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of heat treatment, and specifically to a connecting cover structure for a vacuum quenching furnace. Background Technology

[0002] The traditional structure of existing vacuum quenching furnace connecting covers typically employs a single-seal ring design with manual bolt tightening. The sealing component generally consists of a single-layer silicone rubber or fluororubber sealing ring embedded in an annular groove on the bottom surface of the cover. The contact seal between the furnace body and the cover is achieved by relying on the bolt preload. This is mainly done by manually rotating the bolt or pressing it with a lever. The sealing performance depends on the operator's experience and the uniformity of the bolt tightening torque. In the heat treatment process, the internal temperature of the furnace body often reaches 800-1200℃. The oil fumes and water vapor generated during quenching will accelerate the aging of the sealing ring, and the mechanical wear caused by frequent opening and closing of the furnace cover will further reduce the elastic recovery ability of the sealing material.

[0003] Existing technologies have drawbacks such as weak anti-aging ability of single sealing rings, easy hardening and cracking under long-term high-temperature environment, gaps appearing at the sealing interface, inability to meet the oxidation-free requirements of precision parts quenching, difficulty in ensuring uniform pressure on the sealing surface by manual tightening method, and the operation process requires close contact with the high-temperature furnace body, which poses a risk of burns. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a connecting cover structure for a vacuum quenching furnace. A cylinder assembly automatically closes and presses the second cover onto the first cover, ensuring uniform force on the sealing ring and guaranteeing its integrity. The stepped arrangement of the two sets of sealing rings not only enhances the sealing performance but also, through the barrier of the inner sealing ring, maintains the anti-aging properties of the outer sealing ring for a longer period, extending the working life of the connecting cover structure. Driven by a cylinder, the main body is lifted axially along the cylinder, and the venting core in the third connecting part is automatically pushed up by the gas pressure inside the tank. Gas is discharged through the vent hole, completing the tank depressurization. The depressurization process does not require manual operation, avoiding the risk of burns from close contact with the high-temperature furnace body.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A connecting cover structure for a vacuum quenching furnace includes a tank body, a first cover body on top of the tank body, and a second cover body on top of the first cover body. The first cover body and the second cover body are connected by two sealing rings. A cylinder assembly is connected to the second cover body via a cylinder shaft. The cylinder assembly is used to cooperate with the second cover body to cover the first cover body. The cylinder assembly includes a cylinder bushing sleeved on the cylinder shaft and a cylinder located on one side of the cylinder bushing sleeve. The cylinder is used to cooperate with the cylinder bushing sleeve to drive the cylinder shaft.

[0007] The first cover includes a cap, a first connecting part above the cap, and a second connecting part below the cap. The cap is used to connect to the tank, the first connecting part is used to cooperate with a sealing ring to seal the second cover, and the second connecting part is used to cooperate with the cap to communicate with the tank.

[0008] The first cover has a first through hole and a sliding groove inside the first through hole. The first through hole is used to slide the second cover in conjunction with the sliding groove. A limiting groove is provided around one end of the sliding groove to limit the second cover.

[0009] Two first sealing grooves are provided above the first connecting part. The first sealing grooves are used to cooperate with the second cover to limit the sealing ring.

[0010] The second cover includes a main body, a third connecting part located below the main body, and a pressure chamber located above the main body. The main body is used to connect to the first cover, the third connecting part is used to cooperate with the main body to limit the cylinder assembly, and the pressure chamber is used to detect changes in air pressure to ensure that there is no leakage when the first cover and the second cover are connected.

[0011] The main body is provided with two second sealing grooves, which are used to cooperate with the first cover to limit the sealing ring.

[0012] The third connecting part has a connecting cavity, in which a limiting member is slidably connected. The limiting member is threadedly connected to one end of the cylinder shaft. A bushing is provided at one end of the connecting cavity, which is used to cooperate with the cylinder shaft to slide in the connecting cavity.

[0013] The outer side of the connecting cavity is provided with at least one pressure relief hole, which is used to connect to the tank body. A venting core is provided in the pressure relief hole, and a spring is sleeved on the venting core. The spring is used to cooperate with the venting core to close in the pressure relief hole.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. By setting two first sealing grooves at the first connecting part of the first cover and cooperating with the two second sealing grooves of the second cover to form a double sealing structure, the problem of easy aging of traditional single sealing rings under high temperature environment is effectively solved. The cylinder assembly drives the cylinder shaft to make the second cover evenly press the sealing ring, ensuring the integrity of the sealing ring, effectively preventing the sealing ring from hardening and cracking under high temperature, avoiding gaps at the sealing interface, meeting the oxidation-free requirements of precision parts quenching, and improving product quality.

[0016] 2. The cylinder assembly is used to achieve the closing of the first and second covers and automatic opening and pressure relief, avoiding close contact between personnel and the high-temperature furnace body, reducing the risk of burns. When the gas pressure inside the tank is too high, the detection unit in the pressure chamber can detect it in time and release the gas pressure through the regulating valve to ensure the safety of the tank. When depressurizing, the cylinder is activated to lift the main body of the second cover along the cylinder axis, the vent core in the third connecting part is lifted, and the gas is discharged through the pressure relief hole, completing the automatic pressure relief, improving the convenience of operation, reducing manual intervention, and improving production efficiency. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention.

[0018] Figure 2 This is a 1 / 4 cross-sectional schematic diagram of the present invention.

[0019] Figure 3 This is a schematic cross-sectional view of the first cover of this utility model.

[0020] Figure 4 This is a schematic cross-sectional view of the second cover of this utility model.

[0021] Figure 5 This is a cross-sectional schematic diagram of the third connecting part of the second cover of this utility model.

[0022] Figure 6 This is a cross-sectional schematic diagram of the vent core and spring of this utility model.

[0023] Explanation of icon numbers:

[0024] 1-Tank body, 2-First cover, 20-Cap, 21-First connecting part, 210-First sealing groove, 22-Second connecting part, 23-First through hole, 24-Slide groove, 25-Limiting groove, 3-Second cover, 30-Main body, 300-Second sealing groove, 31-Third connecting part, 310-Connecting cavity, 311-Pressure relief hole, 312-Air venting core, 313-Spring, 314-Limiting block, 32-Pressure chamber, 33-Detection part, 34-Regulating valve, 35-Handle, 36-Limiting component, 37-Shaft sleeve, 4-Sealing ring, 5-Cylinder assembly, 50-Cylinder shaft, 51-Cylinder shaft sleeve, 52-Cylinder. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1-6As shown, this utility model relates to a connecting cover structure for a vacuum quenching furnace, including a tank body 1, a first cover 2 on top of the tank body 1, and a second cover 3 on top of the first cover 2. The first cover 2 and the second cover 3 are connected by two sealing rings 4. A cylinder assembly 5 is connected to the second cover 3 by a cylinder shaft 50. The cylinder assembly 5 is used to cooperate with the second cover 3 to cover the first cover 2. The cylinder assembly 5 includes a cylinder bushing 51 sleeved on the cylinder shaft 50 and a cylinder 52 located on one side of the cylinder bushing 51. The cylinder 52 is used to cooperate with the cylinder bushing 51 to drive the cylinder shaft 50. When the first cover 2 and the tank body 1 are installed, the sealing rings 4 are installed into the first sealing groove 210 on the first connecting part 21 of the first cover 2. Then, the cylinder assembly 5 and the second cover 3 are assembled to cover the first cover 2.

[0027] like Figure 1-4 As shown, the first cover 2 further includes a cap 20, a first connecting part 21 above the cap 20, and a second connecting part 22 below the cap 20. The cap 20 is used to connect the can 1, the first connecting part 21 is used to cooperate with the sealing ring 4 to seal the second cover 3, and the second connecting part 22 is used to cooperate with the cap 20 to connect the can 1. The first cover 2 connects the can 1 and the second cover 3 and is one of the main components of the connecting cover structure that is stably connected to the can 1.

[0028] like Figure 1-4 As shown, the first cover 2 is further provided with a first through hole 23, and a sliding groove 24 is provided inside the first through hole 23. The first through hole 23 is used to slide the second cover 3 in conjunction with the sliding groove 24. A limiting groove 25 is provided around one end of the sliding groove 24. The limiting groove 25 is used to limit the second cover 3.

[0029] like Figure 1-4 As shown, two first sealing grooves 210 are provided above the first connecting part 21. The first sealing grooves 210 are used to cooperate with the second cover 3 to limit the sealing ring 4. The two first sealing grooves 210 are arranged in a stepped manner so that the first connecting part 21 can better cooperate with the second cover 3 to seal.

[0030] like Figure 1-5 As shown, the second cover 3 includes a main body 30, a third connecting part 31 located below the main body 30, and a pressure chamber 32 located above the main body 30. The main body 30 is used to connect to the first cover 2. The third connecting part 31 is used to cooperate with the main body 30 to limit the cylinder assembly 5. The pressure chamber 32 is used to detect changes in air pressure to ensure that there is no leakage in the connection between the first cover 2 and the second cover 3. The pressure chamber 32 is provided with at least one detection part 33 and a regulating valve 34. The detection part 33 is used to measure changes in air pressure, and the regulating valve 34 is used to regulate the air pressure.

[0031] like Figure 1-5As shown, the main body 30 is further provided with two second sealing grooves 300, which are used to cooperate with the first cover 2 to limit the sealing ring 4. Two handles 35 are provided on the top of the main body 30, which are used to hold the second cover 3 during assembly. The two second sealing grooves 300 are arranged in a stepped manner with the first sealing groove 210, so that the main body 30 and the first connecting part 21 can be more precisely sealed.

[0032] like Figure 1-6 As shown, further, the third connecting part 31 is provided with a connecting cavity 310, and a limiting member 36 is slidably connected in the connecting cavity 310. The limiting member 36 is threadedly connected to one end of the cylinder shaft 50. A bushing 37 is provided at one end of the connecting cavity 310. The bushing 37 is used to cooperate with the cylinder shaft 50 to slide in the connecting cavity 310. At least one pressure relief hole 311 is provided on the outside of the connecting cavity 310. The pressure relief hole 311 is used to communicate with the tank body 1. A venting core 312 is provided in the pressure relief hole 311. A spring 313 is sleeved on the venting core 312. The spring 313 is used to cooperate with the vent core 312 to close inside the pressure relief hole 311. When the pressure relief of the tank 1 is completed, the vent core 312 is automatically restored by the spring 313. A limiting block 314 is provided on the outside of the third connecting part 31 to slide in cooperation with the sliding groove 24. The limiting block 314 is used to cooperate with the limiting groove 25 to limit the second cover 3. The main body 30 and the third connecting part 31 are limited in the horizontal direction by the cylinder shaft 50 and the limiting member 36, so that the main body 30 slides in the vertical direction along the cylinder shaft 50.

[0033] Working principle: During assembly of this connecting cover structure, firstly, the cylinder shaft 50 is sequentially passed through the air chamber 32, main body 30, bushing 37, and third connecting part 31 of the second cover 3, and one end of the cylinder shaft 50 is threadedly connected to the limiting member 36 in the connecting cavity 310. Secondly, the cylinder bushing 51 is fitted from the other end of the cylinder shaft 50, and the cylinder 52 is connected to the cylinder bushing 51. Next, the first cover 2 is installed on the tank 1 with the first connecting part 21 facing upwards, and the second connecting part 22 is inserted into the tank 1. Next, the sealing ring 4 is installed in the first sealing groove 210 on the first connecting part 21. Next, the third connecting part 31 of the second cover 3 is inserted into the first through hole 23. When the limiting block 314 slides along the slide groove 24 to one end and enters the limiting groove 25, the second cover 3 is rotated by a certain angle by applying force through the handle, so that the limiting block 314 and the limiting groove 25 are engaged. 5. Limiting is completed; cylinder 52 is activated, and cylinder 52 drives cylinder shaft 50 to extend upward along cylinder bushing 51. The downward pressure of cylinder bushing 51 acts on the second cover 3, so that the second cover 3 is evenly stressed. This ensures that when the second sealing groove 300 cooperates with the first sealing groove 210 to press the sealing ring 4, the sealing ring 4 is evenly stressed, ensuring the integrity of the sealing ring 4. When the air pressure inside the tank 1 is too high, it is detected in time by the detection part 33 in the air pressure chamber 32, and the air pressure is released through the regulating valve 34 to ensure the safety of the tank 1. When it is necessary to open the cover to release pressure, cylinder 52 is activated first, so that the main body 30 of the second cover 3 is lifted upward along cylinder shaft 50. The venting core 312 in the third connecting part 31 is automatically pushed up by the air pressure inside the tank 1, and the gas is discharged through the vent hole, completing the pressure release. The pressure release process does not require manual operation, avoiding the risk of being burned by close contact with the high temperature furnace body.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Therefore, without departing from the design spirit of the present utility model, any equivalent changes or modifications made by those skilled in the art to the structure, features and principles of the present utility model should fall within the protection scope of the patent application of the present utility model.

Claims

1. A connecting cover structure for a vacuum quenching furnace, comprising a tank body, characterized in that: The tank body is provided with a first cover on top, and a second cover is provided on top of the first cover. The first cover and the second cover are connected by two sealing rings. A cylinder assembly is connected to the second cover by a cylinder shaft. The cylinder assembly is used to cooperate with the second cover to cover the first cover. The cylinder assembly includes a cylinder bushing sleeved on the cylinder shaft and a cylinder located on one side of the cylinder bushing sleeve. The cylinder is used to cooperate with the cylinder bushing sleeve to drive the cylinder shaft.

2. The connecting cover structure for a vacuum quenching furnace according to claim 1, characterized in that: The first cover includes a cap, a first connecting part above the cap, and a second connecting part below the cap. The cap is used to connect to the tank, the first connecting part is used to cooperate with a sealing ring to seal the second cover, and the second connecting part is used to cooperate with the cap to communicate with the tank.

3. The connecting cover structure for a vacuum quenching furnace according to claim 2, characterized in that: The first cover has a first through hole and a sliding groove inside the first through hole. The first through hole is used to slide the second cover in conjunction with the sliding groove. A limiting groove is provided around one end of the sliding groove to limit the second cover.

4. The connecting cover structure for a vacuum quenching furnace according to claim 2, characterized in that: Two first sealing grooves are provided above the first connecting part. The first sealing grooves are used to cooperate with the second cover to limit the sealing ring.

5. The connecting cover structure for a vacuum quenching furnace according to claim 1, characterized in that: The second cover includes a main body, a third connecting part located below the main body, and a pressure chamber located above the main body. The main body is used to connect to the first cover, the third connecting part is used to cooperate with the main body to limit the cylinder assembly, and the pressure chamber is used to detect changes in the tank pressure.

6. The connecting cover structure for a vacuum quenching furnace according to claim 5, characterized in that: The main body is provided with two second sealing grooves, which are used to cooperate with the first cover to limit the sealing ring.

7. The connecting cover structure for a vacuum quenching furnace according to claim 5, characterized in that: The third connecting part has a connecting cavity, in which a limiting member is slidably connected. The limiting member is threadedly connected to one end of the cylinder shaft. A bushing is provided at one end of the connecting cavity, which is used to cooperate with the cylinder shaft to slide in the connecting cavity.

8. The connecting cover structure for a vacuum quenching furnace according to claim 7, characterized in that: The outer side of the connecting cavity is provided with at least one pressure relief hole, which is used to connect to the tank body. A venting core is provided in the pressure relief hole, and a spring is sleeved on the venting core. The spring is used to cooperate with the venting core to close in the pressure relief hole.

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