Safety interlocking device of vacuum gas quenching furnace

Abstract

The utility model relates to the technical field of vacuum gas quenching furnaces, in particular to a safety interlocking device of a vacuum gas quenching furnace, which comprises a locking cylinder, a fixing seat, a safety pin and a positioning seat, the fixing seat is fixedly connected onto a furnace body, a cylinder body of the locking cylinder is fixed on the fixing seat, and the end of a rod body of a piston rod of the locking cylinder is fixedly connected with the safety pin. A positioning seat is fixedly arranged on the locking ring, and after the locking ring is locked on the furnace door of the vacuum gas quenching furnace, the safety pin can be inserted into a locking hole of the positioning seat under the driving of the locking air cylinder to lock the locking ring; the interior of a cylinder body of the locking air cylinder is divided into a locking cavity and a reset cavity by a piston of a piston rod of the locking air cylinder, the reset cavity is formed in the side close to the locking ring, the locking cavity is communicated with the interior of the vacuum gas quenching furnace through a connecting pipeline, the reset cavity is communicated with the atmosphere, and a reset mechanism is arranged in the reset cavity. The safety interlocking device of the vacuum gas quenching furnace can ensure that the locking ring does not fail when the interior of the furnace is in a high-pressure state.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum gas quenching furnaces, in particular to a safety interlocking device for vacuum gas quenching furnaces. Background Art

[0002] Vacuum gas quenching furnace can be used to perform vacuum gas quenching on metal parts with high heat treatment requirements, reduce workpiece deformation, reduce processing allowance and surface oxidation and decarburization.

[0003] like Figure 3 He Ru Figure 4 As shown, in the prior art, the locking of the furnace door 3 of the vacuum gas quenching furnace adopts a staggered tooth structure of the locking ring 2 (multiple inclined self-locking surfaces, i.e., inclined irons 9, are used between the locking ring 2 and the furnace door 3), and the locking cylinder 1 is used to drive the locking ring 2 to rotate the switch. When the pressure in the vacuum gas quenching furnace is high pressure, the locking ring cannot be opened. If an unexpected locking failure occurs, the high pressure in the vacuum gas quenching furnace will cause great danger to the equipment and the surrounding area.

[0004] The authorization announcement number is CN218666170U, and the name is a Chinese utility model patent for a safety interlock mechanism and a vacuum gas quenching furnace using the mechanism. A safety interlock mechanism is proposed, including a driving source, which is used to be set on a furnace body. The output shaft of the driving source is provided with a locking member driven by the driving source to move to lock the door clamp. The application can improve the safety of the furnace door of the vacuum gas quenching furnace and reduce the situation where safety is affected by misoperation.

[0005] Although the above patent reduces the probability of unexpected locking failure of the locking ring to a certain extent, its technical solution still has safety risks. It can be seen from the application specification that the driving source is a cylinder, an electric push rod or a hydraulic cylinder. If the solenoid valve controlling the driving source or the power source providing the driving source fails, the safety interlock mechanism will still fail and the locking ring may still open. Therefore, in order to ensure that the locking ring does not fail under high pressure, a vacuum gas quenching furnace safety interlock device is proposed. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a safety interlock device for a vacuum air quenching furnace, which can ensure that the locking ring will not fail when the furnace is in a high-pressure state. By connecting the locking cylinder used to lock the locking ring with the high pressure in the vacuum air quenching furnace, the locking cylinder is not affected by an external power source or a failure of the control solenoid valve, and is only locked or unlocked according to the pressure state in the vacuum air quenching furnace, thereby ensuring that the locking ring will not fail in the high-pressure state in the furnace and improving the safety of the vacuum air quenching furnace.

[0007] The technical solution of the utility model is as follows:

[0008] The locking ring is provided with a locking hole of the positioning seat to lock the locking ring. The interior of the cylinder body of the locking cylinder is divided into a locking chamber and a reset chamber by the piston of the piston rod of the locking cylinder. The reset chamber is arranged on a side close to the locking ring. The locking chamber is communicated with the interior of the vacuum air quenching furnace through a connecting pipeline. The reset chamber is communicated with the atmosphere. A reset mechanism is arranged in the reset chamber to apply a force to the piston rod of the locking cylinder to always keep away from the locking ring.

[0009] The reset mechanism is an elastic element arranged in the reset cavity, and two ends of the elastic element are respectively abutted against the bottom of the reset cavity and the piston of the piston rod.

[0010] The elastic element is a spring, and the spring is sleeved on the rod body of the piston rod.

[0011] A sliding guide hole matched with the safety pin is arranged on the fixing seat, and the safety pin can slide in the sliding guide hole.

[0012] One end portion of the safety pin inserted into the locking hole of the positioning seat is provided with a chamfer.

[0013] The safety pin is connected to the rod end of the piston rod of the locking cylinder through a threaded connection. A threaded hole is provided at the rod end of the piston rod of the locking cylinder. One end of the safety pin connected to the piston rod is provided with an external thread matching the threaded hole.

[0014] A pressure reducing valve is arranged on the connecting pipeline.

[0015] The beneficial effects of the utility model are:

[0016] The utility model discloses a safety interlock device for a vacuum air quenching furnace. The safety interlock device for a vacuum air quenching furnace can ensure that a locking ring will not fail when the furnace is in a high-pressure state. By connecting a locking cylinder used for locking the locking ring with the high pressure in the vacuum air quenching furnace, the locking cylinder is not affected by an external power source or a failure of a control solenoid valve, and is only locked or unlocked according to the pressure state in the vacuum air quenching furnace, thereby ensuring that the locking ring will not fail in the high-pressure state in the furnace and improving the safety of the vacuum air quenching furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0018] In the attached picture:

[0019] Figure 1 It is a structural schematic diagram of a safety interlock device of a vacuum gas quenching furnace in a locked state according to an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a safety interlock device of a vacuum gas quenching furnace in an unlocked state according to an embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a locking ring of a vacuum gas quenching furnace in the prior art when in a locked state;

[0022] Figure 4 It is a structural schematic diagram of a locking ring of a vacuum gas quenching furnace in the prior art when it is in an open state;

[0023] The components represented by the reference numerals in the figure are:

[0024] The utility model comprises: 1. a locking cylinder, 2. a locking ring, 3. a furnace door, 4. a connecting pipeline, 5. a locking cylinder, 6. a fixing seat, 7. a safety pin, 8. a positioning seat, 9. an inclined iron, and 10. a spring. DETAILED DESCRIPTION

[0025] like Figure 3 and Figure 4 As shown, it is a schematic diagram of the structure of the locking ring of the vacuum air quenching furnace in the prior art when in the locked state and the open state. The locking of the furnace door 3 of the vacuum air quenching furnace adopts the staggered tooth structure of the locking ring 2 (multiple inclined planes are used for self-locking between the locking ring 2 and the furnace door 3, namely the inclined iron 9), and the locking cylinder 1 is used to drive the locking ring 2 to rotate the switch. When the pressure in the vacuum air quenching furnace is high pressure, the locking ring 2 cannot be opened. If an unexpected locking failure occurs, the high pressure in the vacuum air quenching furnace will cause great danger to the equipment and the surrounding area.

[0026] The safety interlocking device of the vacuum gas quenching furnace of the present application is used to lock the locking ring 2 in this position after the locking ring 2 is locked, so as to prevent it from unexpectedly rotating.

[0027] like Figure 1 and Figure 2As shown, the safety interlock device of the vacuum gas quenching furnace is arranged between the furnace body of the vacuum gas quenching furnace and the locking ring 2, including a locking cylinder 5, a fixing seat 6, a safety pin 7 and a positioning seat 8. The fixing seat 6 is fixedly connected to the furnace body of the vacuum gas quenching furnace, the cylinder body of the locking cylinder 5 is fixed on the fixing seat 6, the rod end of the piston rod of the locking cylinder 5 is fixedly connected to the safety pin 7, and a positioning seat 8 cooperating with the safety pin 7 is fixedly arranged on the locking ring 2. When the locking ring 2 is locked on the furnace door of the vacuum gas quenching furnace 3, the safety pin 7 can be inserted into the locking hole of the positioning seat 8 under the drive of the locking cylinder 5 to lock the locking ring 2; the interior of the cylinder body of the locking cylinder 5 is divided into a locking chamber and a reset chamber by the piston of the piston rod of the locking cylinder 5, and the reset chamber is arranged on the side close to the locking ring 2, the locking chamber is connected with the interior of the vacuum gas quenching furnace through the connecting pipeline 4, and the reset chamber is connected with the atmosphere, and a reset mechanism is arranged in the reset chamber to give the piston rod of the locking cylinder 5 a force always away from the locking ring 2.

[0028] The reset mechanism is an elastic element arranged in the reset cavity, and the two ends of the elastic element are respectively against the bottom of the reset cavity and the piston of the piston rod; the elastic element is a spring 10, and the spring 10 is sleeved on the rod body of the piston rod.

[0029] A sliding guide hole matched with the safety pin 7 is provided on the fixing seat 6, and the safety pin 7 can slide in the sliding guide hole.

[0030] In order to facilitate the insertion of the safety pin 7 into the positioning seat 8 , a chamfer is provided on one end of the safety pin 7 that is inserted into the locking hole of the positioning seat 8 .

[0031] The safety pin 7 is connected to the rod end of the piston rod of the locking cylinder 5 by a threaded connection. A threaded hole is provided at the rod end of the piston rod of the locking cylinder 5. The end of one side where the safety pin 7 is connected to the piston rod is provided with an external thread matching the threaded hole.

[0032] Preferably, a pressure reducing valve is provided on the connecting pipeline 4. Since the pressure required for the locking cylinder 5 of the safety interlock device of the vacuum air quenching furnace is relatively small, and the high pressure in the vacuum air quenching furnace is particularly large relative to the pressure required for the locking cylinder 5, it is necessary to design the design strength of the relevant components of the safety interlock device of the vacuum air quenching furnace according to the air pressure strength of the vacuum air quenching furnace, which is undoubtedly wasteful. Therefore, a pressure reducing valve is provided on the connecting pipeline 4, which can reduce the air pressure in the vacuum air quenching furnace and then supply it to the locking cylinder 5, so that the original function can be achieved, and the design strength of the relevant components of the safety interlock device of the vacuum air quenching furnace is designed according to the lower air pressure, thereby reducing the cost of the device.

[0033] The working process of the vacuum gas quenching furnace safety interlock device is as follows: the locking cylinder 1 drives the locking ring 2 to lock the furnace door 3, and the inclined iron 9 is pressed at the same time. The air nozzle at the rear of the locking cylinder 5 is connected to the vacuum gas quenching chamber with a connecting pipe 4, which is communicated with the gas quenching chamber, and the air nozzle at the front of the locking cylinder 5 is communicated with the atmosphere. The safety pin 7 is threadedly connected to the cylinder rod of the locking cylinder 5. The safety pin can slide in the fixed seat 6 and enter and exit the positioning seat 8. The cylinder 5 is built with a spring 10. After the furnace door 3 is closed, the locking cylinder 1 drives the locking ring 2 to rotate and lock, the inclined iron 9 is pressed, the vacuum gas quenching chamber is in a vacuum / atmospheric state, the locking cylinder 5 is subjected to the elastic force of the spring 10, the safety pin 7 is in a retracted state, and the safety pin 7 leaves the positioning seat 8. When the vacuum quenching chamber is filled with high-pressure gas, the connecting pipe 4 of the air nozzle after the cylinder 5 is locked is also high-pressure gas, which automatically extends the cylinder rod of the cylinder 5, that is, pushes the safety pin 7 to slide and extend in the fixing seat 6 and enter the hole of the positioning seat 8, so that the locking ring 2 can be guaranteed not to rotate. Since the vacuum quenching chamber is filled with high-pressure gas, the furnace door 3 is prevented from automatically opening and causing danger. When the pressure in the vacuum quenching chamber is atmospheric pressure or negative pressure, the cylinder 5 is subjected to the elastic force of the spring 10, the safety pin 7 is in a retracted state, the safety pin 7 leaves the positioning seat 8, and the locking ring 2 can be rotated to open.

[0034] The safety interlock device of the vacuum air quenching furnace can ensure that the locking ring will not fail when the furnace is in a high-pressure state. By connecting the locking cylinder used to lock the locking ring with the high pressure in the vacuum air quenching furnace, the locking cylinder is not affected by an external power source or a failure of the control solenoid valve, and is only locked or unlocked according to the pressure state in the vacuum air quenching furnace, thereby ensuring that the locking ring will not fail in the high-pressure state in the furnace and improving the safety of the vacuum air quenching furnace.

Claims

1. A safety interlock device for a vacuum gas quenching furnace, characterized in that: The invention is arranged between the furnace body of the vacuum gas quenching furnace and the locking ring (2), and comprises a locking cylinder (5), a fixing seat (6), a safety pin (7) and a positioning seat (8), wherein the fixing seat (6) is fixedly connected to the furnace body of the vacuum gas quenching furnace, the cylinder body of the locking cylinder (5) is fixed to the fixing seat (6), the rod body end of the piston rod of the locking cylinder (5) is fixedly connected to the safety pin (7), and a positioning seat (8) matched with the safety pin (7) is fixedly arranged on the locking ring (2). When the locking ring (2) is locked on the furnace door (3) of the vacuum gas quenching furnace, the locking ring (2) is fixedly connected to the furnace door (3) of the vacuum gas quenching furnace. Afterwards, the safety pin (7) can be inserted into the locking hole of the positioning seat (8) under the drive of the locking cylinder (5) to lock the locking ring (2); the interior of the cylinder body of the locking cylinder (5) is divided into a locking chamber and a reset chamber by the piston of the piston rod of the locking cylinder (5); the reset chamber is arranged on the side close to the locking ring (2); the locking chamber is connected to the interior of the vacuum gas quenching furnace through a connecting pipeline (4); the reset chamber is connected to the atmosphere; and a reset mechanism is arranged in the reset chamber to apply force to the piston rod of the locking cylinder (5) to always keep away from the locking ring (2).

2. A vacuum gas quenching furnace safety interlock device according to claim 1, characterized in that: The reset mechanism is an elastic element arranged in the reset cavity, and two ends of the elastic element are respectively abutted against the bottom of the reset cavity and the piston of the piston rod.

3. A vacuum gas quenching furnace safety interlock device according to claim 2, characterized in that: The elastic element is a spring (10), and the spring (10) is sleeved on the rod body of the piston rod.

4. A vacuum gas quenching furnace safety interlock device according to claim 1, characterized in that: A sliding guide hole cooperating with the safety pin (7) is provided on the fixing seat (6), and the safety pin (7) can slide in the sliding guide hole.

5. A vacuum gas quenching furnace safety interlock device according to claim 1, characterized in that: One end portion of the safety pin (7) inserted into the locking hole of the positioning seat (8) is provided with a chamfer.

6. A vacuum gas quenching furnace safety interlock device according to claim 1, characterized in that: The safety pin (7) is connected to the rod end of the piston rod of the locking cylinder (5) via a threaded connection, a threaded hole is provided at the rod end of the piston rod of the locking cylinder (5), and one end of the safety pin (7) connected to the piston rod is provided with an external thread that matches the threaded hole.

7. A vacuum gas quenching furnace safety interlock device according to claim 1, characterized in that: A pressure reducing valve is provided on the connecting pipeline (4).

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