A box-type industrial furnace

Abstract

This invention relates to the field of industrial kiln equipment technology, specifically to a box-type industrial furnace, comprising at least a furnace body, a sealing door assembly, and a latch assembly. The sealing door assembly includes a wheel axle bearing, a lifting shaft, a counterweight pulley, a driven pulley, a door panel pulley, a rocking pulley, a rocking steering wheel, a counterweight cylinder, and an insulated door panel. The latch assembly includes a latch bracket, an upper linkage component, a transmission connecting rod, a lower torsion component, and a crank assembly; the crank assembly includes a connecting end plate, a handle assembly, and an inner crank lock. The inner crank lock includes a crank inner cavity, a downward movement component, a translation component, and a lower lock head. The box-type industrial furnace described in this invention utilizes a sealing door assembly that facilitates lifting and lowering and can be freely suspended, while also achieving sealing and insulation. The manual crank handle and lower torsion component of the latch assembly can lock the furnace, thereby maintaining constant pressure and closure on the insulated door panel.

Description

Technical Field

[0001] This application relates to the field of industrial kiln equipment technology, specifically to a box-type industrial furnace. Background Technology

[0002] Box-type industrial electric furnaces are a common and important type of heat treatment equipment used in industrial production, laboratory research, and material handling. Their core feature is their box-type structure—possessing a closed heating chamber, typically rectangular or cubic, known as the furnace lining. In addition, they include the furnace body, heating elements, furnace door, and temperature control system. The furnace door of a box-type industrial furnace is equipped with an insulated door panel, and its technical requirements include at least: 1. Liftability to allow material to be loaded and unloaded when raised; 2. Forward and backward movement to achieve a sealed connection between the insulated door panel and the furnace door through forward compression.

[0003] To achieve the above objectives, existing insulated door panels are hoisted using ropes and then secured with latches, which is cumbersome. Therefore, it is necessary to design a door latch mechanism that can be quickly locked and unlocked, as well as a box-type industrial furnace with such a mechanism. Summary of the Invention

[0004] A box-type industrial furnace includes at least a furnace body having a furnace cavity rear opening, a sealing door assembly for shielding the furnace cavity rear opening, and a latch assembly for sealing the sealing door assembly onto the furnace cavity rear opening.

[0005] The sealing door assembly includes wheel axle bearings respectively located on the left and right sides of the upper end of the furnace body, and a rotatable lifting shaft located between the two wheel axle bearings. The left and right sides of the wheel axle bearings are respectively provided with a counterweight rope pulley and a driven rope pulley. The middle of the wheel axle bearings is located on the left and right sides of the rear opening of the furnace cavity, and a door panel rope pulley is also provided on the right end face of the furnace body, which is driven and cooperates with the driven rope pulley. The rocking rope pulley is also provided with a rocking steering wheel. The counterweight rope pulley is connected to a counterweight cylinder through a winding rope, and the door panel rope pulley is connected to an insulation door panel through a winding rope.

[0006] The latch assembly includes a latch bracket, an upper linkage component, a transmission link, a lower torsion component, and a crank assembly;

[0007] Two latch supports are provided, one on the left and one on the right of the rear opening of the furnace cavity. Each latch support includes a longitudinal upright. At least two connecting crossbars connected to the rear end face of the furnace body are provided in front of the longitudinal upright. A rod with an upper hole and a rod with a lower hole are provided above and below the rear end of the longitudinal upright. The right end face of the longitudinal upright located on the right side is also provided with a locking groove. At least three locking grooves are provided, and the locking grooves are evenly distributed along an arc trajectory.

[0008] The upper linkage component includes an upper linkage shaft that is rotatably disposed in a pair of upper perforated rods. The upper linkage shaft is provided with an upper hinge arm on the left and right sides respectively, and a stop end block is provided on the outer side of the upper hinge arm.

[0009] The lower torsion member is provided in a pair, and the lower torsion member includes a rotatable lower torsion shaft provided in the lower perforated rod, a lower hinge arm provided outside the lower torsion shaft, and an abutment terminal provided inside the lower torsion shaft for pressing the heat-insulating door panel.

[0010] The transmission link is provided in a pair, with one end of the transmission link being hinged to the corresponding upper hinge arm and the other end being hinged to the corresponding lower hinge arm.

[0011] The crank assembly includes a connecting end plate fixedly connected to the lower hinge arm and a handle assembly disposed on the outside of the connecting end plate; the handle assembly also has an inner crank lock.

[0012] The crank handle internal lock includes a crank handle inner cavity, a downward moving assembly, a translational moving assembly, and a lowered lock head:

[0013] The inner cavity of the crank handle includes a small-diameter through hole that runs through the handle assembly along the axial direction, an upper moving wide cavity in the upper half of the small-diameter through hole, a longitudinal anti-rotation hole in the upper edge of the upper moving wide cavity, a spacer ring in the lower part of the upper moving wide cavity, a lower moving wide cavity in the lower part of the spacer ring, a cross-shaped support in the upper part of the lower moving wide cavity, a stop end plate in the lower part of the cross-shaped support, vertical claw through holes evenly distributed on the stop end plate, and an anti-rotation side plate in the inner wall of the lower moving wide cavity along the axial direction.

[0014] The downward moving assembly includes a slidable pressing cylinder disposed in the small-diameter through hole, a stop disc disposed below the pressing cylinder and slidingly engaged with the upward moving wide cavity, a downward moving side rod disposed on the side of the pressing cylinder and engaged with the longitudinal stop hole, a trigger cylinder disposed below the stop disc and passing through the spacer convex ring, trigger claws circumferentially distributed on the lower end face of the trigger cylinder, an active oblique hole disposed on the trigger claws, and a reset spring wrapped around the trigger cylinder and abutting against the stop disc;

[0015] The translation component is provided in four parts. The translation component includes a longitudinal sliding plate, a support insertion hole provided on the longitudinal sliding plate and slidably engaged with the cross support, an upper convex circle provided above the front end of the longitudinal sliding plate and engaged with the active inclined hole, and a lower convex circle provided below the rear end of the longitudinal sliding plate.

[0016] The lower lock head includes a lock head base that can slide within the lower wide cavity, a lock head side hole located on the side of the lock head base and accommodating an anti-rotation side plate, driven claws evenly distributed circumferentially on the upper surface of the lock head base and corresponding to the translation components, driven oblique holes located on the driven claws and engaging with the lower convex circles, a lock head inner cavity located inside the lock head base, a lock head lower hole located below the lock head inner cavity, a lock head inner post that can slide within the lock head inner cavity, a lock head compression spring located within the lock head inner cavity and abutting against the lock head inner post, and a lock head end block located on the lower end surface of the lock head inner post and passing through the lock head lower hole and a small-diameter through hole. The lock head end block engages with the locking groove. The driving oblique hole gradually slopes inward from top to bottom, and the driven oblique hole slopes outward from top to bottom. The driven claws pass through the corresponding claw through holes.

[0017] The beneficial effects of the above technical solution are as follows:

[0018] The box-type industrial furnace described in this case uses a sealed door assembly that is easy to raise and lower and can be suspended at will, and can also achieve sealing and heat preservation.

[0019] Convenient lifting and lowering: Rotating the rocking steering wheel and rocking rope wheel drives the driven rope wheel, lifting shaft and door panel rope wheel to rotate. The door panel rope wheel drives the heat-insulating door panel to move longitudinally through the winding rope. At the same time, the counterweight rope wheel drives the counterweight cylinder to move in the opposite direction through the winding rope.

[0020] Free-floating: The winding direction of the rope on the door panel pulley is opposite to that of the rope on the counterweight pulley, so that the counterweight cylinder can apply one.

[0021] Sealing and heat preservation: The heat preservation door panel is suspended by a rope and can achieve a certain degree of heat preservation and sealing by squeezing the rear opening of the furnace cavity forward.

[0022] The box-type industrial furnace described in this case has a door latch assembly with a manual crank handle and a lower torsion member that can be locked to keep the insulation door panel constantly pressed and closed: flipping the manual crank handle forward causes the lower torsion member on the right side to move, the abutment terminal on the right side to flip downward and press the insulation door panel, and at the same time, the abutment terminal on the left side moves synchronously, and the two abutment terminals press the insulation door panel simultaneously.

[0023] The box-type industrial furnace described in this case can also unlock the manual crank handle with a simple pressing action, which facilitates the adjustment of the position and posture of the manual crank handle and the lower torsion component. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the first state of the box-type industrial furnace.

[0026] Figure 2 This is a schematic diagram of the second state of the box-type industrial furnace.

[0027] Figure 3 This is a schematic diagram of the third state of the box-type industrial furnace.

[0028] Figure 4 This is a schematic diagram of one embodiment of the furnace box body.

[0029] Figure 5 This is a schematic diagram of one embodiment of the crank assembly.

[0030] Figure 6 This is a cross-sectional view of the crank handle in its first locked state.

[0031] Figure 7 This is a cross-sectional view of the crank handle in its second locking state.

[0032] Figure 8 It is an isometric sectional view of the crank handle in its first locked state.

[0033] Figure 9 It is an isometric sectional view of the crank handle in its second locked state.

[0034] Figure 10 It is an isometric sectional view of the inner lock section of the crank handle.

[0035] Figure 11 This is an isometric sectional view of the axial section of one embodiment of the crank handle's inner cavity.

[0036] Figure 12 This is an isometric sectional view of a cross section of one embodiment of the crank handle's inner cavity.

[0037] Figure 13 This is a schematic diagram of one embodiment of the downward moving component.

[0038] Figure 14 This is a schematic diagram of one embodiment of the translation component.

[0039] Figure 15 This is a partial cross-sectional view of one embodiment of the lower-mounted lock head.

[0040] Figure 16 This is a schematic diagram of the first state of the crank handle's internal lock (the crank handle's internal cavity is omitted).

[0041] Figure 17 This is a schematic diagram of the second state of the crank handle's internal lock (the crank handle's internal cavity is omitted).

[0042] In the picture:

[0043] 9. Furnace box body, 91. Rear opening of furnace cavity;

[0044] 8. Sealed door assembly; 81. Wheel and axle bearing; 82. Lifting shaft; 83. Counterweight pulley; 84. Driven pulley; 85. Door panel pulley; 86. Shaking pulley; 87. Shaking steering wheel; 88. Counterweight cylinder; 89. Insulated door panel;

[0045] 7. Door latch assembly;

[0046] 71. Door latch bracket; 711. Vertical upright; 712. Connecting crossbar; 713. Upper perforated rod; 714. Lower perforated rod; 715. Locking groove;

[0047] 72. Upper linkage component; 721. Upper linkage shaft; 722. Upper hinge arm; 723. Stopping end block;

[0048] 73. Transmission connecting rod;

[0049] 74. Lower torsion member; 741. Lower torsion shaft; 742. Lower hinge arm; 743. Abutment terminal;

[0050] 75. Crank handle assembly; 751. Connecting end plate; 752. Handle assembly; 753. Crank handle inner lock;

[0051] 1. Crank handle inner cavity; 11. Small diameter through hole; 12. Upward-moving wide cavity; 13. Longitudinal anti-rotation hole; 14. Spacer ring; 15. Downward-moving wide cavity; 16. Cross bracket; 17. Stop end plate; 18. Vertical claw through hole; 19. Anti-rotation side plate;

[0052] 2. Lowering component, 21. Pressing cylinder, 22. Stopping disc, 23. Lowering side rod, 24. Triggering cylinder, 25. Triggering claw, 26. Active inclined hole, 27. Reset spring;

[0053] 3. Translation component; 31. Vertical sliding plate; 32. Frame insertion hole; 33. Upper convex circle; 34. Lower convex circle;

[0054] 4. Lower lock head, 41. Lock head base, 42. Lock head side hole, 43. Driven vertical claw, 44. Driven oblique hole, 45. Lock head inner cavity, 46. Lock head lower hole, 47. Lock head inner post, 48. Lock head compression spring, 49. Lock head end block. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0056] A box-type industrial furnace includes at least a furnace body 9 having a furnace cavity rear opening 91, a sealing door assembly 8 for covering the furnace cavity rear opening 91, and a latch assembly 7 for sealing the sealing door assembly 8 onto the furnace cavity rear opening 91.

[0057] The sealing door assembly 8 includes wheel axle bearings 81 respectively located on the left and right sides of the upper end of the furnace body 9, and a lifting shaft 82 rotatably located between the two wheel axle bearings 81. The wheel axle bearings 81 are respectively provided with a counterweight rope pulley 83 and a driven rope pulley 84 on the left and right sides. The middle of the wheel axle bearings 81 is located on the left and right sides of the rear opening 91 of the furnace cavity, and a door panel rope pulley 85 is also provided. The right end face of the furnace body 9 is also provided with a rocking rope pulley 86 that is in transmission cooperation with the driven rope pulley 84. The rocking rope pulley 86 is also provided with a rocking steering wheel 87. The counterweight rope pulley 83 is connected to a counterweight cylinder 88 by a winding rope, and the door panel rope pulley 85 is connected to an insulation door panel 89 by a winding rope.

[0058] The latch assembly 7 includes a latch bracket 71, an upper linkage 72, a transmission link 73, a lower torsion member 74, and a crank assembly 75;

[0059] Two latch brackets 71 are provided, one on the left and one on the right of the rear opening 91 of the furnace cavity. Each latch bracket 71 includes a longitudinal upright 711. At least two connecting crossbars 712 connected to the rear end face of the furnace body 9 are provided in front of the longitudinal upright 711. An upper perforated rod 713 and a lower perforated rod 714 are provided above and below the rear end of the longitudinal upright 711, respectively. The right end face of the longitudinal upright 711 on the right side is also provided with a locking groove 715. At least three locking grooves 715 are provided and are evenly distributed along an arc-shaped trajectory.

[0060] The upper linkage 72 includes an upper linkage shaft 721 rotatably disposed in a pair of upper perforated rods 713. The upper linkage shaft 721 is provided with an upper hinge arm 722 on the left and right respectively, and a stop end block 723 is provided on the outer side of the upper hinge arm 722.

[0061] The lower torsion member 74 is provided in a pair. The lower torsion member 74 includes a lower torsion shaft 741 rotatably disposed in the lower perforated rod 714, a lower hinge arm 742 disposed outside the lower torsion shaft 741, and an abutment terminal 743 disposed inside the lower torsion shaft 741 for pressing the heat-insulating door panel 89.

[0062] The transmission link 73 is provided in a pair, with one end of the transmission link 73 hinged to the corresponding upper hinge arm 722 and the other end hinged to the corresponding lower hinge arm 742.

[0063] The crank assembly 75 includes a connecting end plate 751 fixedly connected to the lower hinge arm 742 and a handle assembly 752 disposed on the outside of the connecting end plate 751; the handle assembly 752 is also provided with a crank inner lock 753.

[0064] The crank handle internal lock 753 includes a crank handle inner cavity 1, a downward moving component 2, a translational component 3, and a lowered lock head 4.

[0065] The inner cavity 1 of the crank handle includes a small-diameter through hole 11 that extends axially through the handle assembly 752, an upper moving wide cavity 12 located in the upper half of the small-diameter through hole 11, a longitudinal anti-rotation hole 13 located along the upper edge of the upper moving wide cavity 12, a spacer ring 14 located below the upper moving wide cavity 12, a lower moving wide cavity 15 located below the spacer ring 14, a cross bracket 16 located at the upper end of the lower moving wide cavity 15, a stop end plate 17 located below the cross bracket 16, vertical claw through holes 18 evenly distributed on the stop end plate 17, and an anti-rotation side plate 19 located axially on the inner wall of the lower moving wide cavity 15.

[0066] The downward moving assembly 2 includes a slidable pressing cylinder 21 disposed in the small diameter through hole 11, a stop disk 22 disposed below the pressing cylinder 21 and slidably engaged with the upward moving wide cavity 12, a downward moving side rod 23 disposed on the side of the pressing cylinder 21 and engaged with the longitudinal anti-rotation hole 13, a trigger cylinder 24 disposed below the stop disk 22 and passing through the spacer convex ring 14, trigger claws 25 circumferentially distributed on the lower end face of the trigger cylinder 24, an active oblique hole 26 disposed on the trigger claw 25, and a reset spring 27 wound around the trigger cylinder 24 and abutting against the stop disk 22.

[0067] The translation component 3 is provided in four parts. The translation component 3 includes a longitudinal sliding plate 31, a support insertion hole 32 provided on the longitudinal sliding plate 31 and slidably engaged with the cross support 16, an upper convex circle 33 provided above the front end of the longitudinal sliding plate 31 and engaged with the active inclined hole 26, and a lower convex circle 34 provided below the rear end of the longitudinal sliding plate 31.

[0068] The lower lock head 4 includes a lock head base 41 slidably disposed within the lower sliding cavity 15; a lock head side hole 42 disposed on the side of the lock head base 41 and accommodating an anti-rotation side plate 19; driven vertical claws 43 circumferentially distributed on the upper surface of the lock head base 41 and corresponding one-to-one with the translation component 3; driven oblique holes 44 disposed on the driven vertical claws 43 and engaging one-to-one with the lower convex circle 34; a lock head inner cavity 45 disposed inside the lock head base 41; and a lock head lower hole 46 disposed below the lock head inner cavity 45. The lock head includes a sliding inner post 47 within the lock head cavity 45, a lock head compression spring 48 located within the lock head cavity 45 and abutting against the inner post 47, and a lock head end block 49 located on the lower end face of the inner post 47 and passing through the lower lock head hole 46 and the small-diameter through hole 11. The lock head end block 49 engages with the locking groove 715. The active inclined hole 26 gradually slopes inward from top to bottom, and the driven inclined hole 44 slopes outward from top to bottom. The driven vertical claw 43 passes through the corresponding vertical claw through hole 18.

[0069] It should be noted that the locking head end block 49 is also provided with a pressure-bearing inclined surface.

[0070] It should be noted that the front end face of the insulated door panel 89 is provided with a heat insulation layer made of a high-temperature resistant material. The high-temperature resistant material is one of ceramic fiber, glass fiber, or graphite fiber. Further, the high-temperature resistant material is aluminum silicate fiber cotton.

[0071] The latch assembly 7 described in this case can press the heat-insulating door panel 89 of the sealing door assembly 8 forward so that it is pressed against the rear opening 91 of the furnace cavity, thereby reducing the heat dissipation inside the furnace body 9 of the industrial furnace.

[0072] The operation of the latch assembly 7 and the sealing door assembly 8 is as follows:

[0073] S1, Sealed door assembly 8 opens:

[0074] As per the instruction manual Figure 1 As shown,

[0075] The insulated door panel 89 is positioned at a high position, exposing the rear opening 91 of the furnace cavity for easy material feeding.

[0076] At this time, the manual crank handle 75 is in the rear position, the lower torsion member 74 swings upward and drives the upper linkage member 72 to swing upward through the transmission link 73 until the transmission link 73 is blocked by the stop end block 723. At this time, the abutment terminal 743 tilts backward and will not squeeze the heat insulation door panel 89.

[0077] S2. Sealing door assembly 8 falls:

[0078] As per the instruction manual Figure 2 As shown,

[0079] Rotating the rocker wheel 87 and the rope wheel 86 drives the driven rope wheel 84, the lifting shaft 82, and the door panel rope wheel 85 to rotate. The door panel rope wheel 85 lowers the heat-insulating door panel 89 to the same height as the rear opening 91 of the furnace cavity by winding the rope. The counterweight rope wheel 83 raises the counterweight cylinder 88 by winding the rope. Stop rotating the rocker wheel 87, and the position of the heat-insulating door panel 89 remains relatively stable.

[0080] S3. Sealing door assembly 8 seals:

[0081] As per the instruction manual Figure 3 As shown,

[0082] Flip the manual crank 75 forward to drive the lower torsion member 74 on the right side to move, and the abutment terminal 743 on the right side flips forward and presses the heat preservation door panel 89.

[0083] At the same time, the lower hinge arm 742 on the right side flips downward and drives the upper hinge arm 722 on the right side, the upper linkage shaft 721, and the upper hinge arm 722 on the left side to flip downward through the transmission link 73. The upper hinge arm 722 on the left side drives the lower torsion member 74 on the left side to move through the transmission link 73 on the left side, so that the abutment terminal 743 on the left side simultaneously presses the heat preservation door panel 89.

[0084] The latch assembly 7 is ingeniously designed. The upper linkage 71 is located above the rear opening 91 of the furnace cavity, and the latch bracket 71, transmission connecting rod 73, and lower torsion member 74 are located on the side of the rear opening 91 of the furnace cavity. They do not interfere with the rear opening 91 of the furnace cavity and do not affect the normal material feeding and discharging.

[0085] Furthermore, in order to control the degree of compression of the abutment terminal 743 on the heat-insulating door panel 89, it is necessary to adjust the stop position of the manual crank handle 75. The specific process is as follows:

[0086] S1, crank handle internal lock 753 automatic locking:

[0087] The lock head end block 49 is squeezed by the outer wall of the vertical upright 711 located on the right side, and retracts into the small diameter through hole 11 to overcome the damping of the lock head compression spring 48.

[0088] After the lock head end block 49 is aligned with the locking groove 715, it pops out and is locked, maintaining the posture of the manual crank handle 75 and the lower twisting part 74, and always pressing the heat preservation door panel 89 forward.

[0089] As the manual crank handle 75 continues to move forward, the pressure slope of the lock head end block 49 is squeezed into a retracted position by the locking groove 715. After the lock head end block 49 moves to the next locking groove 715, it pops out. At this time, the manual crank handle 75 and the lower torsion member 74 move further forward, giving the heat-insulating door panel 89 a tighter squeezing force.

[0090] S2, crank handle internal lock 753 manual unlock:

[0091] Pressing the downward component 2 causes the pressing cylinder 21 and the stop disk 22 to move against the damping of the reset spring 27, thereby driving the trigger cylinder 24, the trigger claw 25, and the active inclined hole 26 to move.

[0092] The active oblique hole 26 acts on the upper convex circle 33, thereby driving the translation component 3 to move radially outward;

[0093] The lower convex circle 34 acts on the driven oblique hole 44, thereby driving the lower lock head 4 to move in the opposite direction to the lower moving component 2. Although the lock head compression spring 48 is still in the relaxed state, the overall movement of the lower lock head 4 causes the lock head end block 49 to retract into the small diameter through hole 11. The lock head end block 49 no longer locks with the locking groove 715.

[0094] At this point, pull back the hand crank 75 and the lower twisting piece 74 to release the lock on the insulated door panel 89.

Claims

1. A box-type industrial furnace, comprising at least a furnace body (9) having a furnace cavity rear opening (91) and a sealing door assembly (8) for covering the furnace cavity rear opening (91), characterized in that: It also includes a latch assembly (7) that seals the sealing door assembly (8) onto the rear opening (91) of the furnace cavity, the latch assembly (7) including a latch bracket (71), an upper linkage (72), a transmission link (73), a lower torsion member (74), and a crank assembly (75). Two latch brackets (71) are provided. One latch bracket (71) is provided on the left and right sides of the rear opening (91) of the furnace cavity. The latch bracket (71) includes a vertical pole (711). At least two connecting crossbars (712) connected to the rear end face of the furnace body (9) are provided in front of the vertical pole (711). A perforated rod (713) and a perforated rod (714) are provided above and below the rear end of the vertical pole (711). The upper linkage (72) includes an upper linkage shaft (721) rotatably disposed in a pair of upper perforated rods (713). The upper linkage shaft (721) is provided with an upper hinge arm (722) on the left and right respectively. The upper hinge arm (722) is provided with a stop end block (723) on the outside. The lower torsion member (74) is provided in a pair, the lower torsion member (74) includes a rotatable lower torsion shaft (741) disposed in the lower perforated rod (714), a lower hinge arm (742) disposed outside the lower torsion shaft (741), and an abutment terminal (743) disposed inside the lower torsion shaft (741) for pressing the heat-insulating door panel (89). The transmission link (73) is provided in a pair, one end of the transmission link (73) is hinged to the corresponding upper hinge arm (722) and the other end is hinged to the corresponding lower hinge arm (742); The crank assembly (75) includes a connecting end plate (751) fixedly connected to the lower hinge arm (742) and a grip assembly (752) disposed on the outside of the connecting end plate (751). The right end face of the vertical pole (711) located on the right side is also provided with a locking groove (715). The handle assembly (752) is also provided with a crank handle inner lock (753), which includes a crank handle inner cavity (1), a downward moving component (2), a horizontal moving component (3), and a lowered lock head (4). The inner cavity (1) of the crank handle includes a small-diameter through hole (11) that runs through the handle assembly (752) along the axial direction, an upper moving wide cavity (12) provided in the upper half of the small-diameter through hole (11), a longitudinal anti-rotation hole (13) provided on the upper edge of the upper moving wide cavity (12), a spacer ring (14) provided below the upper moving wide cavity (12), a lower moving wide cavity (15) provided below the spacer ring (14), a cross stand (16) provided at the upper end of the lower moving wide cavity (15), a stop end plate (17) provided below the cross stand (16), vertical claw through holes (18) evenly distributed on the stop end plate (17) around the circumference, and an anti-rotation side plate (19) provided along the axial direction on the inner wall of the lower moving wide cavity (15). The lowering assembly (2) includes a slidable pressing cylinder (21) located in the small diameter through hole (11), a stop disc (22) located below the pressing cylinder (21) and slidingly engaged with the upper moving wide cavity (12), a lowering side rod (23) located on the side of the pressing cylinder (21) and engaged with the longitudinal stop hole (13), a trigger cylinder (24) located below the stop disc (22) and passing through the spacer ring (14), trigger claws (25) circumferentially distributed on the lower end face of the trigger cylinder (24), an active inclined hole (26) located on the trigger claw (25), and a reset spring (27) wound around the trigger cylinder (24) and abutting against the stop disc (22). The translation component (3) is provided in four parts. The translation component (3) includes a longitudinal sliding plate (31), a support insertion hole (32) provided on the longitudinal sliding plate (31) and slidably engaged with the cross support (16), an upper convex circle (33) provided above the front end of the longitudinal sliding plate (31) and engaged with the active inclined hole (26), and a lower convex circle (34) provided below the rear end of the longitudinal sliding plate (31). The lower lock head (4) includes a lock head base (41) slidably disposed within the lower sliding cavity (15), a lock head side hole (42) disposed on the side of the lock head base (41) and accommodating the anti-rotation side plate (19), driven vertical claws (43) circumferentially distributed on the upper surface of the lock head base (41) and corresponding one-to-one with the translation component (3), driven oblique holes (44) disposed on the driven vertical claws (43) and interlocking with the lower convex circle (34), and a lock head (44) disposed inside the lock head base (41). The lock cylinder cavity (45), the lock cylinder lower hole (46) located below the lock cylinder cavity (45), the lock cylinder inner post (47) slidably located in the lock cylinder cavity (45), the lock cylinder compression spring (48) located in the lock cylinder cavity (45) and abutting against the lock cylinder inner post (47), the lock cylinder end block (49) located on the lower end face of the lock cylinder inner post (47) and passing through the lock cylinder lower hole (46) and the small diameter through hole (11), the lock cylinder end block (49) is locked in place with the locking groove (715).

2. The box-type industrial furnace according to claim 1, characterized in that: The sealing door assembly (8) includes wheel axle bearings (81) respectively located on the left and right sides of the upper end of the furnace body (9), and a rotatable lifting shaft (82) located between the two wheel axle bearings (81). The wheel axle bearings (81) are respectively provided with a counterweight rope wheel (83) and a driven rope wheel (84) on the left and right sides. The wheel axle bearings (81) are also provided with a door panel rope wheel (85) on the left and right sides of the rear opening (91) of the furnace cavity in the middle. The right end face of the furnace body (9) is also provided with a rocking rope wheel (86) that is in transmission cooperation with the driven rope wheel (84). The rocking rope wheel (86) is also provided with a rocking steering wheel (87). The counterweight rope wheel (83) is connected to a counterweight cylinder (88) by a winding rope. The door panel rope wheel (85) is connected to an insulation door panel (89) by a winding rope.

3. A box-type industrial furnace according to claim 2, characterized in that: The locking groove (715) is provided with at least three, and the locking groove (715) is distributed at equal intervals along an arc-shaped trajectory.

4. A box-type industrial furnace according to claim 3, characterized in that: The active inclined hole (26) gradually tilts inward from top to bottom, and the driven inclined hole (44) tilts outward from top to bottom.

5. A box-type industrial furnace according to claim 4, characterized in that: The driven vertical claw (43) is set through the corresponding vertical claw through hole (18).

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