Tubular vacuum furnace and control system

Abstract

The utility model relates to the technical field of annealing furnaces, in particular to a tubular vacuum furnace and a control system.The tubular vacuum furnace comprises an annealing box body, a furnace cabin body arranged in the annealing box body and a hearth body arranged in the annealing box body and used for heating and annealing the furnace cabin body; the furnace cabin body comprises a furnace cabin glass tube and a furnace cabin end tube, the furnace cabin glass tube is arranged in the hearth body, the furnace cabin end tube is coaxially and fixedly connected to a port of the furnace cabin glass tube and fixedly arranged on the side wall of the annealing box body in a penetrating mode, a sealing ring is embedded in the end face, away from the furnace cabin glass tube, of the furnace cabin end tube, and the annealing box body is provided with a furnace door for controlling opening and closing of the port of the furnace cabin end tube. And the annealing box body is provided with a first cooling assembly for cooling the furnace cabin end pipe. The device has the effects that the service life of the sealing ring is prolonged, annealing is free of oxidation, the annealing time is short, and annealing heating is uniform.

Description

Technical Field

[0001] The present application relates to the technical field of annealing furnaces, and in particular to a tubular vacuum furnace and a control system. Background Art

[0002] 3D printing technology is increasingly used in the manufacturing industry, and the quality and performance of 3D printed parts are crucial to practical applications. Annealing is one of the key steps to improve the performance of 3D printed parts. Tubular vacuum furnaces play an important role in the annealing process of dental 3D printed parts. By annealing in a vacuum environment, the oxidation and contamination of dental 3D printed parts can be effectively reduced, thereby improving the purity and quality of dental 3D printed parts.

[0003] The existing tubular vacuum furnace for dental 3D printed parts includes a furnace chamber and a furnace chamber built into the furnace chamber. The inner cavity of the furnace chamber is used to place dental 3D printed parts. The furnace chamber is used to heat the furnace chamber. The furnace chamber is provided with a furnace cover for controlling the opening and closing of the furnace chamber port. The furnace chamber port is provided with a sealing ring to improve the airtightness between the furnace chamber and the furnace cover. However, the sealing ring is in a high temperature environment during the annealing operation, which reduces the service life of the sealing ring. Therefore, the sealing ring needs to be replaced regularly, which increases the maintenance cost of the tubular vacuum furnace, so further improvement is needed. Utility Model Content

[0004] In order to increase the service life of the sealing ring and reduce the maintenance cost of the tubular vacuum furnace, one of the purposes of the present application is to provide a tubular vacuum furnace.

[0005] The tubular vacuum furnace provided in this application adopts the following technical solution:

[0006] A tubular vacuum furnace comprises an annealing box, a furnace chamber body arranged in the annealing box, and a furnace body arranged in the annealing box to heat and anneal the furnace chamber body, the furnace chamber body comprising a furnace chamber glass tube built into the furnace chamber body and a furnace chamber end tube coaxially fixedly connected to the furnace chamber glass tube port and fixedly penetrated through the side wall of the annealing box, a sealing ring is embedded in the end surface of the furnace chamber end tube away from the furnace chamber glass tube, the annealing box is provided with a furnace door for controlling the opening and closing of the port of the furnace chamber end tube, and the annealing box is provided with a first cooling component for cooling the furnace chamber end tube.

[0007] By adopting the above technical solution, the furnace door is opened, and after the 3D printed part is placed in the furnace chamber glass tube, the furnace door is closed so that the furnace door is pressed against the end face of the furnace chamber end tube, the furnace body heats the furnace chamber glass tube, and the first cooling component cools the furnace chamber end tube to reduce the possibility of heat from the furnace chamber end tube being transferred to the sealing ring, so that the sealing ring is at a relatively low temperature, the possibility of damage to the sealing ring due to high temperature is reduced, the service life of the sealing ring is increased, and the maintenance cost of the tubular vacuum furnace is reduced.

[0008] Preferably, the first cooling assembly comprises a first fan arranged in the annealing box, and the first fan blows air toward the furnace chamber end pipe.

[0009] By adopting the above technical solution, during the annealing process, the first fan is turned on, and the first fan blows air toward the furnace chamber end tube to cool the furnace chamber end tube.

[0010] Preferably, the first cooling assembly comprises a cooling plate coaxially sleeved on the furnace chamber end pipe, the cooling plate has a medium flow channel, and the cooling plate is provided with a medium inlet pipe and a medium outlet pipe connected to the medium flow channel.

[0011] By adopting the above technical solution, during the annealing process, the cooling medium is transported to the medium flow channel of the cooling disk through the medium inlet pipe, the cooling medium absorbs the heat of the furnace end pipe, thereby cooling the furnace end pipe, and the cooling medium that has absorbed the heat is discharged from the cooling disk through the medium outlet pipe.

[0012] Preferably, the furnace body is connected to the annealing box by sliding along the axial direction of the furnace chamber glass tube, and the annealing box is provided with a first driving component for driving the furnace body.

[0013] By adopting the above technical solution, when performing annealing operation, the first driving component drives the furnace body to slide toward the furnace body, so that the furnace glass tube is built into the furnace body, so that the furnace body heats the furnace glass tube. When the furnace glass tube needs to be cooled, the first driving component drives the furnace body to slide back, so that the furnace glass tube is exposed, thereby accelerating the cooling speed of the furnace glass tube and shortening the cooling time of the furnace glass tube.

[0014] Preferably, the annealing box is provided with a second cooling component for cooling the glass tube in the furnace chamber.

[0015] By adopting the above technical solution, when the furnace chamber glass tube needs to be cooled, the first driving component drives the furnace body to slide back, so that the furnace chamber glass tube is exposed, and the furnace chamber glass tube is cooled by the second cooling component, thereby further accelerating the cooling speed of the furnace chamber glass tube and shortening the cooling time of the furnace chamber glass tube.

[0016] Preferably, the furnace body includes a first half furnace and a second half furnace with an inner cavity, the second half furnace is fixedly connected to the annealing box, the first half furnace is hinged to an end of the second half furnace away from the furnace chamber end pipe, and the annealing box is provided with a second drive assembly for driving the free end of the first half furnace to rotate around the axis of the hinge point.

[0017] By adopting the above technical solution, when performing annealing operation, the second driving component drives the free end of the first half furnace to rotate toward the second half furnace, thereby covering the furnace chamber glass tube, so that the furnace body heats the circumference of the furnace chamber glass tube. When the furnace chamber glass tube needs to be cooled, the second driving component drives the free end of the first half furnace to rotate away from the second half furnace, so that the semicircular side of the furnace chamber glass tube is exposed, thereby accelerating the cooling speed of the furnace chamber glass tube and shortening the cooling time of the furnace chamber glass tube.

[0018] Preferably, the furnace body comprises a first half furnace and a second half furnace having an inner cavity, the first half furnace / the second half furnace are connected to the annealing box along a vertical sliding direction, and the annealing box is provided with a third driving assembly for driving the first half furnace / the second half furnace to slide vertically.

[0019] By adopting the above technical solution, when performing annealing operation, the third driving component drives the first half furnace / the second half furnace to slide towards the direction close to the furnace chamber glass tube, thereby covering the furnace chamber glass tube, so that the furnace body heats the surrounding side of the furnace chamber glass tube. When the furnace chamber glass tube needs to be cooled, the third driving component drives the first half furnace / the second half furnace to slide away from the furnace chamber glass tube, so that the furnace chamber glass tube is exposed, the cooling speed of the furnace chamber glass tube is accelerated, and the cooling time of the furnace chamber glass tube is shortened.

[0020] Preferably, the furnace body is provided with a heating element for heating the furnace chamber glass tube, and a plurality of heating elements are provided and are distributed at intervals around the axis of the furnace chamber glass tube.

[0021] By adopting the above technical solution, a plurality of heating elements are provided and spaced apart around the axis of the furnace chamber glass tube, thereby improving the uniformity of annealing heating of the furnace chamber glass tube, making the performance of the entire 3D printed part in the furnace chamber glass tube uniform, reducing internal stress and deformation, and thus improving the quality and precision of the 3D printed part.

[0022] In order to increase the service life of the sealing ring and reduce the maintenance cost of the tubular vacuum furnace, the second purpose of the present application is to provide a control system.

[0023] A control system comprises a tubular vacuum furnace, a main power switch and a vacuum water cooling switch. An exhaust pipe for evacuating an inner cavity is passed through the furnace chamber end pipe, the exhaust pipe is externally connected to a vacuum pump, an inlet medium pipe is externally connected to a water cooler, an outlet medium pipe is connected to the water cooler, a vacuum water cooling switch is electrically connected to the main power switch, and the vacuum water cooling switch is used to control the opening and closing of the vacuum pump and the water cooler.

[0024] Preferably, it also includes a control panel arranged on the annealing box, the control panel is electrically connected to the main power switch, the control panel is electrically connected to the PLC module, the vacuum water cooling switch includes two first electromagnetic relays, the two first electromagnetic relays are electrically connected to the PLC module, one of the first electromagnetic relays is electrically connected to the vacuum pump to control the opening and closing of the vacuum pump, and the other first electromagnetic relay is electrically connected to the water cooler to control the opening and closing of the water cooler.

[0025] In summary, the utility model has the following beneficial effects:

[0026] 1. Open the furnace door, place the 3D printed part in the furnace chamber glass tube, close the furnace door, make the furnace door close to the end face of the furnace chamber end tube, the furnace body heats the furnace chamber glass tube, and the first cooling component cools the furnace chamber end tube to reduce the possibility of heat from the furnace chamber end tube being transferred to the sealing ring, so that the sealing ring is at a relatively low temperature, reducing the possibility of damage to the sealing ring due to high temperature, and increasing the service life of the sealing ring, so as to reduce the maintenance cost of the tubular vacuum furnace;

[0027] 2. When performing annealing operation, the first driving component drives the furnace body to slide toward the furnace body, so that the furnace glass tube is built into the furnace body, so that the furnace body heats the furnace glass tube. When the furnace glass tube needs to be cooled, the first driving component drives the furnace body to slide back, so that the furnace glass tube is exposed, thereby accelerating the cooling speed of the furnace glass tube and shortening the cooling time of the furnace glass tube;

[0028] 3. A plurality of heating elements are provided and spaced around the axis of the furnace chamber glass tube, so as to improve the uniformity of annealing heating of the furnace chamber glass tube, make the performance of the entire 3D printed part in the furnace chamber glass tube uniform, reduce internal stress and deformation, and thus improve the quality and precision of the 3D printed part. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of a tubular vacuum furnace in Example 1;

[0030] Figure 2 is a schematic diagram of the internal structure of the annealing box in Example 1;

[0031] Figure 3 is a structural schematic diagram of the furnace body in Example 1;

[0032] Figure 4 is a schematic structural diagram of the first drive assembly in Example 1;

[0033] Figure 5 is a schematic structural diagram of the furnace door in Example 1;

[0034] Figure 6is a schematic diagram of the structure of the cooling plate in Example 1;

[0035] Figure 7 is a schematic diagram of the structure of the control system in Example 1;

[0036] Figure 8 is a schematic diagram of the structure of the control system in Example 2;

[0037] Fig. 9 is a structural schematic diagram of the furnace body in Example 3;

[0038] Fig.10 It is a structural schematic diagram of the furnace body in Example 4.

[0039] In the figure, 1, annealing box; 11, frame; 111, walking wheel; 112, fixing plate; 113, status indicator light; 12, side plate; 121, vacuum gauge; 13, top plate; 14, partition; 141, guide rail; 2, furnace body; 21, fireproof brick plate; 22, heating element; 23, slide seat; 24, protective cover shell; 25, first half furnace; 26, second half furnace; 3, furnace body; 31, furnace glass tube; 32, furnace end tube; 321, exhaust pipe; 322, pressure relief valve; 323, sealing ring; 33, furnace door; 331, buckle; 332, connecting rod; 333 , guide rod; 334, handle; 34, placement plate; 341, insulation plate; 4, first drive assembly; 41, drive bracket; 42, driving wheel; 43, driven wheel; 44, transmission belt; 45, connecting seat; 46, drive motor; 5, first cooling assembly; 51, first fan; 52, cooling plate; 521, medium flow channel; 522, medium inlet pipe; 523, medium outlet pipe; 6, second cooling assembly; 7, second drive assembly; 8, third drive assembly; 101, main power switch; 102, vacuum water cooling switch; 103, temperature controller; 104, forward and backward switch. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-10 This application is described in further detail.

[0041] Embodiment 1:

[0042] The present application embodiment discloses a tubular vacuum furnace, referring to Figure 1, including an annealing box 1, a furnace chamber body 3 arranged in the annealing box 1, and a furnace chamber body 2 arranged in the annealing box 1 to heat and anneal the furnace chamber body 3. The annealing box 1 includes a frame 11 arranged in a square shape, side panels 12 arranged on the four sides of the frame 11, and a top plate 13 fixedly connected to the top of the frame 11. The bottom of the frame 11 is rotatably connected to a walking wheel 111 to facilitate the movement of the annealing box 1. In this embodiment, the side panels 12 located on the front and rear sides of the frame 11 are fixedly connected to the frame 11, and the side panels 12 located on the left and right sides of the frame 11 are hinged to the frame 11 to form left and right warehouse doors, which is convenient for maintaining the internal structure of the frame 11.

[0043] Reference Figure 2 , Figure 3 , a partition 14 is fixedly connected to the middle position of the frame 11, and the furnace body 2 is arranged above the partition 14. In this embodiment, the furnace body 2 is cylindrical, and the outer peripheral wall of the furnace body 2 is coaxially fixedly sleeved with a furnace skin, and the inner peripheral walls at both ends of the furnace body 2 are coaxially fixedly connected with fireproof brick plates 21. The fireproof brick plate 21 is provided with a heating element 22, and the heating element 22 is provided in multiple numbers and is distributed around the axis of the furnace chamber glass tube 31. Specifically, the heating element 22 is a tungsten filament glass tube fixedly penetrated through the fireproof brick plate 21. The furnace body 2 is axially slidably connected to the partition 14, and the upper end surface of the partition 14 is fixedly connected to the guide rail 141. The lower peripheral wall of the furnace body 2 is fixedly connected to a slide seat 23 slidably connected to the guide rail 141, and the side plate 12 located at the rear side of the frame 11 is provided with a through hole for the furnace body 2 to slide out. In this embodiment, a protective cover shell 24 is disposed at the rear end of the furnace body 2 , and the protective cover shell 24 is fixedly connected to the slide seat 23 .

[0044] Reference Figure 2 , Figure 4 The partition 14 is provided with a first driving assembly 4 for driving the furnace body 2. Specifically, the first driving assembly 4 includes a driving bracket 41 fixedly connected to the lower end surface of the partition 14, a driving wheel 42 rotatably connected to the driving bracket 41, a driven wheel 43 rotatably connected to the driving bracket 41, a transmission belt 44 fixedly wound between the driving wheel 42 and the driven wheel 43, a connecting seat 45 fixedly connected between the transmission belt 44 and the furnace body 2, and a driving motor 46 fixedly connected to the driving bracket 41. The output shaft of the driving motor 46 is coaxially fixedly connected to the driving wheel 42, and the partition 14 is provided with an avoidance groove for the connecting seat 45 to slide through.

[0045] Reference Figure 1 , Figure 2 , Figure 3The furnace chamber body 3 includes a furnace chamber glass tube 31 and a furnace chamber end tube 32. The end of the furnace chamber glass tube 31 close to the furnace chamber body 2 is a closed end, and the other end of the furnace chamber glass tube 31 is an open end. The fireproof brick plate 21 at the front end of the furnace chamber body 2 is coaxially slidably sleeved on the furnace chamber glass tube 31. Both ends of the furnace chamber end tube 32 are open, and the furnace chamber end tube 32 is coaxially fixedly connected to the open end of the furnace chamber glass tube 31. The end of the furnace chamber end tube 32 away from the furnace chamber glass tube 31 is fixedly penetrated through the side plate 12 on the front side of the annealing box 1. The furnace chamber end tube 32 is penetrated with an exhaust pipe 321 for evacuating the inner cavity. The exhaust pipe 321 is externally connected to a vacuum pump, so that the workpiece does not contact with the outside air during the annealing process, and annealing without oxidation is achieved. The exhaust pipe 321 is provided with a pressure relief valve 322 , and the side plate 12 on the front side of the annealing box 1 is provided with a vacuum gauge 121 for detecting the air pressure in the inner cavity of the furnace chamber body 3 .

[0046] Reference Figure 1 , Figure 5 The end surface of the furnace chamber end tube 32 away from the furnace chamber glass tube 31 is embedded with a sealing ring 323, and the annealing box 1 is provided with a furnace door 33 for controlling the opening and closing of the port of the furnace chamber end tube 32. In this embodiment, the furnace door 33 is connected to the annealing box 1 along the axial direction of the furnace chamber end tube 32. Specifically, the outer end surface of the furnace door 33 is fixedly connected with a connecting rod 332, the length direction of the connecting rod 332 is parallel to the radial direction of the furnace door 33, and the end of the connecting rod 332 is fixedly connected with a guide rod 333 that is slidably provided on the side plate 12 on the front side of the annealing box 1, and the axial direction of the guide rod 333 is parallel to the axial direction of the furnace chamber end tube 32. The furnace door 33 and the furnace chamber end tube 32 are locked by a buckle 331. A handle 334 is fixedly connected to the middle part of the outer end surface of the furnace door 33, and a placement plate 34 for placing 3D printed parts is fixedly connected to the inner end surface of the furnace door 33. The placement plate 34 has air holes, and the placement plate 34 slides into the furnace chamber body 3. The placement plate 34 is fixedly sleeved with an insulation plate 341 that abuts against the inner wall of the furnace chamber end pipe 32, and a plurality of insulation plates 341 are provided.

[0047] Reference Figure 2 , Figure 6The annealing box 1 is provided with a first cooling assembly 5 for cooling the furnace end pipe 32. The first cooling assembly 5 includes a first fan 51 provided on the outer wall of the top front side of the frame 11 and a cooling plate 52 coaxially sleeved on the furnace end pipe 32. The first fan 51 is located directly above the furnace end pipe 32, and the first fan 51 blows air toward the furnace end pipe 32. The inner wall of the front side of the frame 11 is fixedly connected with a fixing plate 112 located above the partition 14 and sleeved on the furnace end pipe 32. The cooling plate 52 is fixedly connected to the fixing plate 112, and the inner peripheral wall of the cooling plate 52 abuts against the outer peripheral wall of the furnace end pipe 32. The cooling plate 52 has a medium flow channel 521, and the cooling plate 52 is provided with a medium inlet pipe 522 and a medium outlet pipe 523 connected to the medium flow channel 521. The medium inlet pipe 522 is externally connected to a water cooler, and the medium outlet pipe 523 is connected to the water cooler. Cooling water is transported to the medium flow channel 521 of the cooling disk 52 through the medium inlet pipe 522, and the cooling water absorbs the heat of the furnace end pipe 32, thereby cooling the furnace end pipe 32. The cooling water that has absorbed the heat is discharged into the water cooler through the medium outlet pipe 523 to be cooled again for recycling.

[0048] Reference Figure 1 , Figure 4 The partition 14 is provided with a travel limit switch, two travel limit switches are provided and distributed along the axial direction of the furnace body 2, and a status indicator light 113 is fixedly penetrated on the upper front side of the frame 11. The partition 14 is provided with a second cooling component 6 for cooling the furnace chamber glass tube 31, and the second cooling component 6 is a second fan fixedly connected to the partition 14 and located below the furnace body 2 and the furnace chamber glass tube 31.

[0049] The implementation principle of a tubular vacuum furnace in the embodiment of the present application is as follows: open the furnace door 33, place the 3D printed part on the placement plate 34, manually push the furnace door 33 so that the furnace door 33 is pressed against the end surface of the furnace chamber end tube 32 and the placement plate 34 is extended into the furnace chamber glass tube 31, lock the buckle 331, and start the vacuum pump to evacuate the inner cavity of the furnace chamber body 3, and at the same time start the first fan 51 and the water cooler to cool the furnace chamber end tube 32, start the drive motor 46 to drive the furnace chamber body 2 to the annealing station, so that the furnace chamber glass tube 31 enters the inner cavity of the furnace chamber body 2, and the heating element 22 heats the furnace chamber glass tube 31;

[0050] After the annealing heating is completed, when the furnace chamber glass tube 31 needs to be cooled, the drive motor 46 is started to drive the furnace body 2 to slide back to the cooling station, so that the furnace chamber glass tube 31 is exposed, and the second fan is started to cool the furnace chamber glass tube 31, thereby further accelerating the cooling speed of the furnace chamber glass tube 31 and shortening the cooling time of the furnace chamber glass tube 31.

[0051] The present application also discloses a control system, referring to Figure 1, Figure 7 , including a tubular vacuum furnace, a main power switch 101 arranged on the side plate 12 on the front side of the annealing box 1, a vacuum water cooling switch 102 for controlling the start and stop of the vacuum pump and the water cooler, a temperature controller 103 for controlling the start and stop of the tungsten filament glass tube, and a forward and backward switch 104 for controlling the forward, reverse and stop of the drive motor 46.

[0052] Specifically, turning on the main power switch 101 is used to connect the power to the entire control system, and turning off the main power switch 101 is used to disconnect the power to the entire control system. The first fan 51 and the second fan are both electrically connected to the main power switch 101, and the main power switch 101 is used to control the opening and closing of the first fan 51 and the second fan. The vacuum water cooling switch 102 is electrically connected to the main power switch 101, and the vacuum water cooling switch 102 is electrically connected to an AC contactor, which is electrically connected to a vacuum pump and a water cooler, and the AC contactor protects the circuit.

[0053] The thermostat 103 is electrically connected to the main power switch 101, and is electrically connected to an AC voltage regulating module, which is electrically connected to a fuse, which is electrically connected to the tungsten glass tube. When the circuit is overloaded, the fuse is disconnected, and the fuse protects the circuit. A thermocouple is provided on the furnace body 2, and the thermocouple is electrically connected to the thermostat 103. The thermocouple generates a temperature signal according to the annealing heating temperature of the furnace body 2 and sends it to the thermostat 103. The thermostat 103 controls the AC voltage regulating module to adjust the voltage of the tungsten glass tube according to the temperature signal, thereby adjusting the annealing heating temperature.

[0054] The forward and backward switch 104 is electrically connected to the main power switch 101, and the two travel limit switches are electrically connected to the forward and backward switch 104. When the furnace body 2 slides backward to the travel limit switch abutting against the rear side of the furnace body 2, the status indicator 113 is displayed in red, and the drive motor 46 stops rotating. When the furnace body 2 slides forward to the travel limit switch abutting against the front side of the furnace body 2, the status indicator 113 is displayed in green, and the drive motor 46 stops rotating. In this embodiment, the main power switch 101, the vacuum water cooling switch 102, and the forward and backward switch 104 are all knob switches.

[0055] Embodiment 2:

[0056] The difference from Example 1 is that, referring to Figure 8, a control system, further comprising a control panel arranged on a side panel 12 on the front side of an annealing box 1, the control panel being electrically connected to a main power switch 101, the control panel being electrically connected to a PLC module, a vacuum water cooling switch 102 comprising two first electromagnetic relays, both of which being electrically connected to the PLC module, one of which being electrically connected to a vacuum pump to control the opening and closing of the vacuum pump, and the other being electrically connected to a water cooler to control the opening and closing of the water cooler. When the furnace door 33 is closed, a signal is sent to the PLC module through the control panel, and the vacuum pump is started through the first electromagnetic relay to evacuate the inner cavity of the furnace chamber body 3, and the water cooler is started through another first electromagnetic relay; a vacuum gauge 121 is electrically connected to the PLC module, and when the vacuum gauge 121 detects that the inner cavity of the furnace chamber body 3 reaches a set vacuum value, a feedback signal is transmitted to the PLC module, and the control panel controls the vacuum pump to stop the evacuation operation through the first electromagnetic relay according to the feedback signal.

[0057] The temperature controller 103 is electrically connected to the PLC module. The thermocouple generates a temperature signal according to the annealing heating temperature of the furnace body 2 and sends it to the temperature controller 103 and the PLC module in sequence. The control panel controls the AC voltage regulating module to adjust the voltage of the tungsten filament glass tube according to the temperature signal, thereby adjusting the annealing heating temperature.

[0058] The forward-reverse switch 104 includes two relays, which are electrically connected to the PLC module and the drive motor 46. One relay is used to control the forward rotation of the drive motor 46, and the other relay is used to control the reverse rotation of the drive motor 46. The travel limit switch is electrically connected to the PLC module. When one of the relays controls the drive motor 46 to rotate forward, thereby driving the furnace body 2 to slide forward to the travel limit switch abutting against the front end of the furnace body 2, the travel limit switch output signal is fed back to the PLC module, and the control panel controls the relay to disconnect according to the signal, and the drive motor 46 stops rotating. When the other relay controls the drive motor 46 to reverse, thereby driving the furnace body 2 to slide backward to the travel limit switch abutting against the rear end of the furnace body 2, the travel limit switch output signal is fed back to the PLC module, and the control panel controls the relay to disconnect according to the signal, and the drive motor 46 stops rotating.

[0059] The pressure relief valve 322 is an electromagnetic vacuum vent valve, and the PLC module is electrically connected to a second electromagnetic relay, which is electrically connected to the electromagnetic vacuum vent valve to control the opening and closing of the electromagnetic vacuum vent valve. When the annealing operation is completed, the control panel controls the second electromagnetic relay to work through the PLC, thereby controlling the start of the pressure relief valve 322, thereby injecting gas to release pressure in the inner cavity of the furnace chamber body 3, and facilitating the opening of the furnace door 33.

[0060] Embodiment 3:

[0061] The difference from Example 1 is that, referring to Fig. 9 The furnace body 2 includes a first half furnace 25 and a second half furnace 26 having an inner cavity. The second half furnace 26 is fixedly connected to the upper end surface of the partition 14. One end of the first half furnace 25 away from the furnace end pipe 32 is hinged to the second half furnace 26. The annealing box 1 is provided with a second driving assembly 7 for driving the free end of the first half furnace 25 to rotate around the axis of the hinge point. Specifically, the outer peripheral wall of the free end of the first half furnace 25 is fixedly connected with a mounting block. The second driving assembly 7 is a flip cylinder. The cylinder body of the flip cylinder is hinged to the partition 14, and the piston rod end of the flip cylinder is hinged to the mounting block.

[0062] When performing annealing operation, the piston rod of the flipping cylinder contracts to drive the free end of the first half furnace 25 to rotate toward the second half furnace 26, thereby covering the furnace chamber glass tube 31, so that the furnace body 2 can heat the circumference of the furnace chamber glass tube 31. When the furnace chamber glass tube 31 needs to be cooled, the piston rod of the flipping cylinder extends to drive the free end of the first half furnace 25 to rotate away from the second half furnace 26, so that the semicircular side of the furnace chamber glass tube 31 is exposed, thereby accelerating the cooling speed of the furnace chamber glass tube 31 and shortening the cooling time of the furnace chamber glass tube 31.

[0063] Embodiment 4:

[0064] The difference from Example 3 is that, referring to Fig.10 The first half furnace 25 / the second half furnace 26 is connected to the annealing box 1 along the vertical sliding. In this embodiment, the second half furnace 26 is fixedly connected to the upper end surface of the partition 14, and the first half furnace 25 slides vertically. The second annealing box 1 is provided with a third driving assembly 8 for driving the first half furnace 25 to slide vertically. Specifically, the third driving assembly 8 is a lifting cylinder located above the first half furnace 25, and the cylinder body of the lifting cylinder is fixedly connected to the top plate 13, and the piston rod of the lifting cylinder is fixedly connected to the upper semicircular wall of the first half furnace 25.

[0065] When performing annealing operation, the piston rod of the lifting cylinder extends to drive the first half furnace 25 to slide toward the furnace chamber glass tube 31, thereby covering the furnace chamber glass tube 31, so that the furnace chamber body 2 can heat the surrounding side of the furnace chamber glass tube 31. When the furnace chamber glass tube 31 needs to be cooled, the piston rod of the lifting cylinder contracts to drive the first half furnace 25 to rise, so that the furnace chamber glass tube 31 is exposed, the cooling speed of the furnace chamber glass tube 31 is accelerated, and the cooling time of the furnace chamber glass tube 31 is shortened.

[0066] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tubular vacuum furnace, characterized in that: The invention comprises an annealing box (1), a furnace chamber body (3) arranged in the annealing box (1), and a furnace body (2) arranged in the annealing box (1) to heat and anneal the furnace chamber body (3); the furnace chamber body (3) comprises a furnace chamber glass tube (31) built into the furnace chamber body (2) and a furnace chamber end tube (32) coaxially fixedly connected to the end of the furnace chamber glass tube (31) and fixedly penetrated through the side wall of the annealing box (1); a sealing ring (323) is embedded in the end surface of the furnace chamber end tube (32) away from the furnace chamber glass tube (31); the annealing box (1) is provided with a furnace door (33) for controlling the opening and closing of the end of the furnace chamber end tube (32); and the annealing box (1) is provided with a first cooling component (5) for cooling the furnace chamber end tube (32).

2. A tubular vacuum furnace according to claim 1, characterized in that: The first cooling assembly (5) comprises a first fan (51) arranged on the annealing box (1), and the first fan (51) blows air towards the furnace chamber end pipe (32).

3. A tubular vacuum furnace according to claim 1, characterized in that: The first cooling assembly (5) comprises a cooling plate (52) coaxially sleeved on the furnace chamber end pipe (32), the cooling plate (52) having a medium flow channel (521), and the cooling plate (52) being provided with a medium inlet pipe (522) and a medium outlet pipe (523) connected to the medium flow channel (521).

4. A tubular vacuum furnace according to claim 1, characterized in that: The furnace body (2) is connected to the annealing box (1) by sliding along the axial direction of the furnace chamber glass tube (31); the annealing box (1) is provided with a first driving component (4) for driving the furnace body (2).

5. A tubular vacuum furnace according to claim 4, characterized in that: The annealing box (1) is provided with a second cooling component (6) for cooling the furnace chamber glass tube (31).

6. A tubular vacuum furnace according to claim 1, characterized in that: The furnace body (2) comprises a first half furnace (25) and a second half furnace (26) having an inner cavity, the second half furnace (26) being fixedly connected to the annealing box (1), the first half furnace (25) being hinged to an end of the second half furnace (26) away from the furnace chamber end pipe (32), and the annealing box (1) being provided with a second drive assembly (7) for driving the free end of the first half furnace (25) to rotate around the axis of the hinge point.

7. A tubular vacuum furnace according to claim 1, characterized in that: The furnace body (2) comprises a first half furnace (25) and a second half furnace (26) having an inner cavity, the first half furnace (25) / the second half furnace (26) being connected to the annealing box (1) in a vertical sliding manner, and the annealing box (1) is provided with a third driving assembly (8) for driving the first half furnace (25) / the second half furnace (26) to slide vertically.

8. The tubular vacuum furnace according to claim 1, characterized in that: The furnace body (2) is provided with a heating element (22) for heating the furnace chamber glass tube (31); a plurality of heating elements (22) are provided and are distributed at intervals around the axis of the furnace chamber glass tube (31).

9. A control system, characterized in that: The invention comprises a tubular vacuum furnace as claimed in claim 3, a main power switch (101) and a vacuum water cooling switch (102); a furnace chamber end pipe (32) is provided with an exhaust pipe (321) for evacuating the inner cavity; the exhaust pipe (321) is externally connected to a vacuum pump; a medium inlet pipe (522) is externally connected to a water cooler; a medium outlet pipe (523) is connected to the water cooler; a vacuum water cooling switch (102) is electrically connected to the main power switch (101); and the vacuum water cooling switch (102) is used to control the opening and closing of the vacuum pump and the water cooler.

10. A control system according to claim 9, characterized in that: The invention also comprises a control panel arranged on the annealing box (1), the control panel being electrically connected to the main power switch (101), the control panel being electrically connected to the PLC module, the vacuum water cooling switch (102) comprising two first electromagnetic relays, the two first electromagnetic relays being electrically connected to the PLC module, one of the first electromagnetic relays being electrically connected to the vacuum pump to control the start and stop of the vacuum pump, and the other first electromagnetic relay being electrically connected to the water cooling machine to control the start and stop of the water cooling machine.

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