Furnace door lifting and pressing mechanism

Abstract

The utility model discloses a furnace door lifting and pressing mechanism which comprises a furnace door guide frame, an air cylinder, a furnace door pressing frame and a furnace door. The furnace door guide frame is of a frame-shaped structure and arranged on the outer side of a furnace opening in a surrounding mode, the air cylinder is installed on the furnace door guide frame and connected with the furnace door pressing frame, the furnace door pressing frame is embedded in the furnace door guide frame in a lifting mode through the air cylinder, the furnace door is movably embedded in the furnace door pressing frame, and the furnace door can be pressed on the furnace opening in a sealed mode through the furnace door pressing frame. The utility model relates to the technical field of industrial furnaces, and can solve the problems of disordered structural arrangement and unreliable sealing at a furnace mouth in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial furnaces, in particular to a furnace door lifting and pressing mechanism. Background Art

[0002] In a sealed box-type tempering electric furnace, the opening and closing movement trajectory of the furnace door includes vertical lifting and lateral translation. The lifting and lowering of the furnace door are usually achieved by a cylinder, and the lateral translation between the furnace mouth and the furnace door is achieved by four cylinders distributed on both sides of the furnace door to ensure the compression and sealing of the furnace door on the furnace mouth.

[0003] Since the opening and closing functions of the furnace door require the cooperation of five cylinders, there are many pneumatic pipelines, and the solenoid valves on the pneumatic pipelines are also relatively many, which makes the structural layout at the furnace mouth appear to be relatively messy. In addition, due to the different distribution positions of the four cylinders used to control the compression and sealing of the furnace door, the lengths of their air supply pipelines are correspondingly different, which easily leads to asynchronous operation of each cylinder, resulting in different sealing degrees at different parts of the furnace mouth, affecting the sealing reliability of the furnace mouth. Therefore, it is necessary to provide a furnace door lifting and clamping mechanism that can solve the problems of messy structural layout and unreliable sealing at the furnace mouth in the prior art. Summary of the invention

[0004] The utility model aims to provide a furnace door lifting and pressing mechanism, which can solve the problems of disordered structure arrangement and unreliable sealing at the furnace mouth in the prior art.

[0005] The utility model is achieved in this way:

[0006] A furnace door lifting and clamping mechanism comprises a furnace door guide frame, a cylinder, a furnace door clamping frame and a furnace door; the furnace door guide frame is a frame-type structure and is arranged around the outside of a furnace opening, the cylinder is installed on the furnace door guide frame and connected to the furnace door clamping frame, so that the furnace door clamping frame can be lifted and embedded in the furnace door guide frame through the cylinder, and the furnace door is movably embedded in the furnace door clamping frame, so that the furnace door can be sealed and clamped on the furnace opening through the furnace door clamping frame.

[0007] The inner walls of both sides of the furnace door guide frame are formed with first guide grooves, and the two side ends of the furnace door clamping frame are respectively slidably embedded in the two first guide grooves, so that the furnace door clamping frame can be vertically lifted and embedded in the furnace door guide frame.

[0008] The furnace door clamping frame includes a clamping plate, an upper connecting rod and a lower connecting rod. A pair of clamping plates are respectively connected between the two ends of the upper connecting rod and the lower connecting rod to form a frame structure; the two ends of the furnace door are movably connected between the pair of clamping plates, and the bottom of the furnace door passes downward through the lower connecting rod, so that the furnace door can be movably embedded in the furnace door clamping frame.

[0009] A plurality of guide wheels are arranged at intervals on a surface of each clamping plate facing the first guide groove, and the clamping plate is slidably embedded in the first guide groove through the plurality of guide wheels.

[0010] A plurality of second guide grooves are formed on each of the pressing plates, and the second guide grooves extend obliquely upward toward the furnace opening. A plurality of guide columns are provided at both ends of the furnace door, and the plurality of guide columns can slide through the plurality of second guide grooves respectively, so that the furnace door can be sealed and pressed against the furnace opening.

[0011] A cylinder connection seat is provided in the middle of the top surface of the upper connecting rod, and the piston rod of the cylinder penetrates the top rod of the furnace door guide frame.

[0012] A plurality of supporting rollers are arranged at intervals on the inner wall of the bottom of the furnace door guide frame, and the bottom of the furnace door can be slidably abutted against the plurality of supporting rollers.

[0013] A plurality of adjusting top screws are installed at intervals on a side of the furnace door guide frame close to the furnace opening, and the plurality of adjusting top screws abut against the furnace body outside the furnace opening, so that the furnace door guide frame can be adjustably installed outside the furnace opening.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model is provided with a furnace door guide frame, a cylinder and a furnace door clamping frame. The furnace door clamping frame performs vertical lifting movement in the furnace door guide frame driven by the cylinder. The furnace door is embedded in the furnace door clamping frame and can be lifted and lowered synchronously with the furnace door clamping frame. The furnace door can perform horizontal movement relative to the furnace door clamping frame under the sliding guidance of the second guide groove and the guide column, so that the furnace door can be pressed onto the furnace mouth, and a reliable pressing and sealing effect is played. Only one cylinder is required to realize the lifting, opening and closing and pressing and sealing functions of the furnace door. While ensuring the sealing effect of the furnace mouth, the number of pneumatic pipelines and their solenoid valves is reduced, and the structural layout of the furnace mouth is simpler. At the same time, the problem of poor sealing of the furnace mouth caused by inconsistent pressing degrees between the furnace door and various parts of the furnace mouth when multiple cylinders are controlled is avoided. The utility model is suitable for sealing the furnace mouth of industrial furnaces such as sealed box-type tempering electric furnaces.

[0016] 2. The utility model is provided with an adjusting top screw, which can adjust the gap between the furnace mouth and the furnace door by rotating the adjusting top screw, so that the furnace door is parallel to the plane where the furnace mouth is located, ensuring the consistency of the degree of compression of various parts of the furnace door after the furnace door is pressed against the furnace mouth by horizontal movement, thereby further ensuring the sealing reliability of the furnace mouth.

[0017] 3. The utility model is provided with a supporting roller, so that after the furnace door is lowered into place, its bottom rolls against the supporting roller, converting the sliding friction at the bottom of the furnace door into rolling friction, greatly reducing the horizontal movement resistance of the furnace door and ensuring the smooth compression and sealing of the furnace door. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the furnace door lifting and pressing mechanism of the utility model;

[0019] Figure 2 This is a front view of the furnace door pressing frame in the furnace door lifting and pressing mechanism of the utility model;

[0020] Figure 3 It is a side view of the furnace door pressing frame in the furnace door lifting and pressing mechanism of the utility model;

[0021] Figure 4 This is a front view of the furnace door in the furnace door lifting and pressing mechanism of the utility model;

[0022] Figure 5 It is a side view of a furnace door in the furnace door lifting and pressing mechanism of the utility model.

[0023] In the figure, 1 is a furnace door guide frame, 11 is an adjusting top screw, 12 is a first guide groove, 2 is an air cylinder, 3 is a furnace door clamping frame, 31 is a cylinder connecting seat, 32 is a clamping plate, 33 is a guide wheel, 34 is an upper connecting rod, 35 is a lower connecting rod, 36 is a second guide groove, 4 is a furnace door, 41 is a guide column, and 5 is a supporting roller. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please see attached Figure 1 A furnace door lifting and pressing mechanism comprises a furnace door guide frame 1, a cylinder 2, a furnace door pressing frame 3 and a furnace door 4; the furnace door guide frame 1 is a frame-type structure and is arranged around the outside of the furnace mouth, the cylinder 2 is installed on the furnace door guide frame 1 and connected with the furnace door pressing frame 3, so that the furnace door pressing frame 3 can be lifted and embedded in the furnace door guide frame 1 through the cylinder 2, and the furnace door 4 is movably embedded in the furnace door pressing frame 3, so that the furnace door 4 can be sealed and pressed on the furnace mouth through the furnace door pressing frame 3.

[0026] The cylinder 2 can be a cylinder commonly used in the furnace door opening and closing control system of the prior art, and is connected to an external gas source through a pneumatic pipeline. The piston rod is driven by the air pressure change of the cylinder 2 to drive the furnace door pressing frame 3 to move up and down in the furnace door guide frame 1. Since the furnace door 4 is embedded in the furnace door pressing frame 3, the furnace door pressing frame 3 is lifted and lowered while driving the furnace door 4 to move up and down, so that the furnace door 4 can be lowered and covered on the furnace mouth, and can also be raised and separated from the furnace mouth, so as to achieve the purpose of lifting and opening and closing control of the furnace door 4.

[0027] At the same time, the furnace door 4 is pressed against the furnace opening while the furnace door pressing frame 3 is raised and lowered. The furnace door 4 can adopt a conventional industrial furnace door structure, and a sealing groove is arranged on the inner side of the furnace door, so that sealing is achieved by pressing the sealing groove against the furnace opening.

[0028] The furnace door 4 is synchronously lowered and pressed and sealed during the process of being pressed down by the furnace door clamping frame 3, and only one cylinder 2 is needed for control, thereby solving the problems in the prior art of controlling the lowering and pressing of the furnace door by five cylinders, resulting in multiple pneumatic pipelines, multiple solenoid valves, messy layout at the furnace mouth, asynchronous movement of the four cylinders controlling the pressing, and poor furnace mouth sealing reliability.

[0029] Please see attached Figure 1 The first guide grooves 12 are formed on the inner walls of both sides of the furnace door guide frame 1, and the two side ends of the furnace door clamping frame 3 are respectively slidably embedded in the two first guide grooves 12, so that the furnace door clamping frame 3 can be vertically lifted and embedded in the furnace door guide frame 1.

[0030] Preferably, the furnace door guide frame 1 can be made of channel steel, and the size of the furnace door guide frame 1 can be adaptably manufactured according to the size of the furnace mouth and the furnace door 4 .

[0031] The first guide groove 12 is formed by the groove body of the channel steel, which is used to provide guidance and limit for the lifting and lowering of the furnace door clamping frame 3, to ensure that the furnace door clamping frame 3 performs stable lifting and lowering movement within the plane where the furnace door guide frame 1 is located, to avoid the displacement and rotation of the furnace door clamping frame 3, thereby also making the lifting and lowering trajectory of the furnace door 4 more stable and controllable.

[0032] Please see attached Figure 2 and attached Figure 3 The furnace door clamping frame 3 includes a clamping plate 32, an upper connecting rod 34 and a lower connecting rod 35. A pair of clamping plates 32 are respectively connected between the two ends of the upper connecting rod 34 and the lower connecting rod 35 to form a frame structure; the two ends of the furnace door 4 are movably connected between the pair of clamping plates 32, and the bottom of the furnace door 4 passes through the lower connecting rod 35 downward, so that the furnace door 4 is movably embedded in the furnace door clamping frame 3.

[0033] Preferably, a pair of clamping plates 32 can be made of steel plates, and the upper connecting rod 34 and the lower connecting rod 35 can be made of square steel. The pair of clamping plates 32, the upper connecting rod 34 and the lower connecting rod 35 form a rectangular frame structure. The size of the square frame structure can be adaptably made according to the size of the furnace door 4, so as to facilitate the installation of the furnace door 4.

[0034] The furnace door 4 is movably connected to the pressing plate 32, so that the furnace door 4 can move horizontally, thereby enabling the furnace door 4 to have a function of pressing and sealing the furnace opening.

[0035] Please see attached Figure 2 and attached Figure 3 A plurality of guide wheels 33 are provided at intervals on a surface of each clamping plate 32 facing the first guide groove 12 , and the clamping plate 32 is slidably embedded in the first guide groove 12 through the plurality of guide wheels 33 .

[0036] Preferably, guide wheels 33 can be respectively provided on the upper and lower parts of the outer wall of the clamping plate 32, i.e., the surface facing the first guide groove 12. The installation direction of the guide wheels 33 is consistent with the lifting and lowering direction of the furnace door clamping frame 3. The guide wheels 33 are in rolling contact with the inner wall of the first guide groove 12, and the rolling friction is small, thereby ensuring the stability, smoothness and controllability of the lifting and lowering movement of the furnace door clamping frame 3 between a pair of first guide grooves 12.

[0037] Please see attached Figure 3 Each of the pressing plates 32 is formed with a plurality of second guide grooves 36, which extend obliquely upward toward the furnace opening. Figure 4 and attached Figure 5 A plurality of guide posts 41 are provided at both ends of the furnace door 4, and the plurality of guide posts 41 can slide through the plurality of second guide grooves 36, respectively, so that the furnace door 4 can be sealed and pressed against the furnace opening.

[0038] Since the furnace door 4 passes downward through the lower connecting rod 35 of the furnace door clamping frame 3, the descending stroke of the furnace door 4 is smaller than the furnace door clamping frame 3, that is, the furnace door 4 touches the bottom inner wall of the furnace door guide frame 1 before the furnace door clamping frame 3, thereby limiting the descent of the furnace door 4 while allowing the furnace door clamping frame 3 to continue to descend relative to the furnace door 4.

[0039] The second guide groove 36 is a long strip structure inclined upward. When the furnace door pressing frame 3 can continue to descend relative to the furnace door 4, the guide column 41 slides along the second guide groove 36 to ensure the relative movement between the furnace door 4 and the furnace door pressing frame 3. Since the furnace door pressing frame 3 can only perform vertical lifting movement in the furnace door guide frame 1, the furnace door 4 can perform horizontal movement relative to the furnace door pressing frame 3 through the inclined second guide groove 36, and the lifting movement of the furnace door pressing frame 3 is converted into a horizontal movement of the furnace door 4 approaching the furnace opening, so that the furnace door 4 can be pressed against the furnace opening to achieve the purpose of sealing, or separated from the furnace opening to release the seal.

[0040] The length of the second guide groove 36 is determined according to the relative movement stroke between the furnace door 4 and the furnace door clamping frame 3, the horizontal distance between the two ends of the second guide groove 36 is determined according to the horizontal movement stroke required for clamping the furnace door 4, and the groove width of the second guide groove 36 is slightly larger than the diameter of the guide column 41 to ensure that the furnace door 4 can be just translated and clamped onto the furnace mouth during the descent of the furnace door clamping frame 3, and will not loosen after being clamped.

[0041] The lower connecting rod 35 should be provided with a through slot for the furnace door 4 to pass through. The length of the through slot should be slightly larger than the width of the furnace door 4, and the width of the through slot should be slightly larger than the thickness of the furnace door 4 + the horizontal movement stroke of the furnace door 4 to ensure the embedding and movement of the furnace door 4.

[0042] Please see attached Figure 1A plurality of supporting rollers 5 are arranged at intervals on the bottom inner wall of the furnace door guide frame 1 , and the bottom of the furnace door 4 can slide against the plurality of supporting rollers 5 .

[0043] Since the furnace door 4 needs to move horizontally after being lowered into place, there is friction between the furnace door 4 and the bottom inner wall of the furnace door guide frame 1. In order to prevent the friction from affecting the horizontal movement of the furnace door 4, the supporting roller 5 is installed to convert the sliding friction into rolling friction, thereby reducing the friction and ensuring that the horizontal movement of the furnace door 4 is smooth and unobstructed.

[0044] Preferably, two supporting rollers 5 can be provided and symmetrically arranged about the central axis of the furnace door guide frame 1, so that the force and horizontal movement of the furnace door 4 are more balanced and stable.

[0045] The rolling direction of the support roller 5 should be consistent with the horizontal movement direction of the furnace door 4 to ensure that a rolling guide is provided for the horizontal movement of the furnace door 4 to avoid affecting the horizontal movement of the furnace door 4.

[0046] Please see attached Figure 1 A plurality of adjusting top screws 11 are installed at intervals on one side of the furnace door guide frame 1 close to the furnace opening. The plurality of adjusting top screws 11 abut against the furnace body outside the furnace opening, so that the furnace door guide frame 1 can be adjustably installed outside the furnace opening.

[0047] Preferably, the adjusting top screw 11 can adopt a bolt and nut, and the nut is rotatably arranged on the inner wall of the furnace door guide frame 1, that is, the side of 1 close to the furnace mouth, through a rotating bearing, and one end of the bolt is screwed with the nut thread. When the nut is rotated, the rotation of the nut can be converted into axial linear motion of the bolt through thread transmission, so that the bolt can be screwed out of the furnace door guide frame 1 close to the furnace body, or the bolt can be screwed into the furnace door guide frame 1 away from the furnace body.

[0048] When the bolt is screwed out and close to the furnace body, the adjusting top screw 11 is extended to increase the distance between the furnace door guide frame 1 and the furnace body. When the bolt is screwed in and away from the furnace body, the adjusting top screw 11 is shortened to reduce the distance between the furnace door guide frame 1 and the furnace body. Four adjusting top screws 11 can be symmetrically arranged, so that the installation angle of the furnace door guide frame 1 can be adjusted by rotating the four adjusting top screws 11, so that the furnace door guide frame 1 and the furnace door 4 are parallel to the plane where the furnace mouth is located, thereby ensuring that the sealing degree between the sealing groove of the furnace door 4 and each position of the furnace mouth is consistent after the furnace door 4 is pressed, thereby improving the sealing effect of the furnace mouth.

[0049] Please see attached Figure 2 and attached Figure 3 A cylinder connecting seat 31 is provided in the middle of the top surface of the upper connecting rod 34 , and the piston rod of the cylinder 2 passes through the top rod of the furnace door guide frame 1 and is connected to the upper connecting rod 34 through the cylinder connecting seat 31 .

[0050] Preferably, the connecting seat 31 can adopt two ear plates with pin holes, and the end of the piston rod of the cylinder 2 connected to the upper connecting rod 34 is also formed with a pin hole. The piston rod is inserted between the two ear plates, the pin hole on the piston rod is aligned with the pin holes of the two ear plates, and the cylinder 2 and the upper connecting rod 34 can be connected by passing the pin through the pin hole. The connection is reliable and the disassembly and assembly are convenient.

[0051] Please see attached Figure 1 To Attachment Figure 5 , the assembly method of the utility model is:

[0052] Two guide wheels 33 are bolted to the upper and lower outer walls of the pressing plate 32, and the guide wheels 33 on the pair of pressing plates 32 are symmetrically installed. The upper and lower parts of the pair of pressing plates 32 are both formed with second guide grooves 36 arranged obliquely. The furnace door guide frame 1 of rectangular frame structure is made of channel steel, so that the first guide grooves 12 are formed on both sides of the furnace door guide frame 1 through the channel body of the channel steel.

[0053] Guide columns 41 are respectively installed at the upper and lower parts of both side ends of the furnace door 4, and the furnace door guide frame 1 is horizontally placed on the assembly table, and the furnace door 4 is placed in the furnace door guide frame 1. A pair of clamping plates 32 are respectively placed between the furnace door 4 and the furnace door guide frame 1 on both sides, so that the two guide columns 41 on both sides of the furnace door 4 respectively penetrate the two second guide grooves 36 on the pair of clamping plates 32, and the clamping plates 32 are slidably arranged in the first guide grooves 12 through two guide wheels 33.

[0054] The upper connecting rod 34 and the lower connecting rod 35 are screwed between the top and bottom of a pair of clamping plates 32 to form a square frame structure, which is suitable for a rectangular (square) furnace door 4; the furnace door 4 is located in the square frame structure, and the bottom of the furnace door 4 passes through the through groove reserved on the lower connecting rod 35.

[0055] The cylinder 2 is mounted on the top of the furnace door guide frame 1, and the piston rod of the cylinder 2 penetrates the furnace door guide frame 1 and is detachably connected to the cylinder connection seat 31 in the middle of the top surface of the upper connecting rod 34 through a latch. Four adjusting screws 11 are symmetrically mounted on the side of the furnace door guide frame 1 close to the furnace opening, and two supporting rollers 5 are symmetrically mounted on the bottom inner wall of the furnace door guide frame 1, and the rolling direction of the supporting rollers 5 is consistent with the translation direction of the furnace door 4.

[0056] Finally, the furnace door guide frame 1 is installed outside the furnace body, and the adjusting top screws 11 on the furnace door guide frame 1 are rotated and adjusted. The four adjusting top screws 11 are pressed against the outer wall of the furnace body to make the plane where the furnace door 4 is located parallel to the plane where the furnace mouth is located.

[0057] Please see attached Figure 1 To Attachment Figure 5 , the working process and working principle of the utility model are:

[0058] When the furnace door 4 is closed, the cylinder 2 is started, and the piston rod of the cylinder 2 pushes the furnace door pressing frame 3 downward, and the furnace door pressing frame 3 descends along the first guide groove 12 of the furnace door guide frame 1 through the guide wheel 33, and the furnace door 4 descends synchronously with the furnace door pressing frame 3. In this process, under the action of gravity, the guide column 41 of the furnace door 4 is located at the bottom of the second guide groove 36.

[0059] The furnace door 4 descends until its bottom contacts the two support rollers 5. At this time, the furnace door 4 just covers the furnace opening. The two support rollers 5 limit the descent of the furnace door 4, while the furnace door pressing frame 3 continues to descend under the control of the cylinder 2. Under the guidance of the second guide groove 36, the guide column 41 slides obliquely upward along the second guide groove 36, driving the furnace door 4 to translate toward the furnace opening, so that the sealing groove of the furnace door 4 is pressed against the furnace opening to achieve the purpose of sealing. In this process, the guide column 41 moves from the lower end of the second guide groove 36 to the upper end.

[0060] When the furnace door 4 is opened, the cylinder 2 retracts the piston rod, so that the furnace door pressing frame 3 moves upward along the first guide groove 12 through the guide wheel 33. Under the guidance of the second guide groove 36 and the guide column 41, the furnace door pressing frame 3 first moves upward relative to the furnace door 4, and the furnace door 4 moves in a direction away from the furnace opening, thereby releasing the seal between the sealing groove of the furnace door 4 and the furnace opening. In this process, the guide column 41 moves from the upper end of the second guide groove 36 to the lower end.

[0061] The cylinder 2 continues to lift the furnace door pressing frame 3, so that the furnace door pressing frame 3 drives the furnace door 4 to rise synchronously to the top of the furnace door guide frame 1, and the furnace door 4 is lifted and opened in place.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A furnace door lifting and clamping mechanism, characterized by: The invention comprises a furnace door guide frame (1), a cylinder (2), a furnace door pressing frame (3) and a furnace door (4); the furnace door guide frame (1) is a frame-shaped structure and is arranged around the outside of the furnace opening; the cylinder (2) is mounted on the furnace door guide frame (1) and connected to the furnace door pressing frame (3), so that the furnace door pressing frame (3) can be lifted and embedded in the furnace door guide frame (1) through the cylinder (2); the furnace door (4) is movably embedded in the furnace door pressing frame (3), so that the furnace door (4) can be sealed and pressed on the furnace opening through the furnace door pressing frame (3).

2. The furnace door lifting and clamping mechanism according to claim 1 is characterized in that: First guide grooves (12) are formed on the inner walls on both sides of the furnace door guide frame (1), and the two side ends of the furnace door clamping frame (3) are respectively slidably embedded in the two first guide grooves (12), so that the furnace door clamping frame (3) can be vertically lifted and embedded in the furnace door guide frame (1).

3. The furnace door lifting and clamping mechanism according to claim 2 is characterized in that: The furnace door clamping frame (3) comprises a clamping plate (32), an upper connecting rod (34) and a lower connecting rod (35), wherein a pair of clamping plates (32) are respectively connected between the ends of the upper connecting rod (34) and the lower connecting rod (35) to form a frame structure; the two ends of the furnace door (4) are movably connected between the pair of clamping plates (32), and the bottom of the furnace door (4) passes through the lower connecting rod (35) downward, so that the furnace door (4) is movably embedded in the furnace door clamping frame (3).

4. The furnace door lifting and clamping mechanism according to claim 3 is characterized in that: A plurality of guide wheels (33) are arranged at intervals on a surface of each clamping plate (32) facing the first guide groove (12), and the clamping plate (32) is slidably embedded in the first guide groove (12) via the plurality of guide wheels (33).

5. The furnace door lifting and clamping mechanism according to claim 3 or 4, characterized in that: A plurality of second guide grooves (36) are formed on each of the pressing plates (32), and the second guide grooves (36) extend obliquely upward in the direction of the furnace opening. A plurality of guide columns (41) are provided at both ends of the furnace door (4), and the plurality of guide columns (41) can slide through the plurality of second guide grooves (36) respectively, so that the furnace door (4) can be sealed and pressed against the furnace opening.

6. The furnace door lifting and clamping mechanism according to claim 3 is characterized in that: A cylinder connecting seat (31) is provided in the middle of the top surface of the upper connecting rod (34); the piston rod of the cylinder (2) penetrates the top rod of the furnace door guide frame (1) and is connected to the upper connecting rod (34) through the cylinder connecting seat (31).

7. The furnace door lifting and clamping mechanism according to claim 1 or 2, characterized in that: A plurality of supporting rollers (5) are arranged at intervals on the inner wall of the bottom of the furnace door guide frame (1), and the bottom of the furnace door (4) can slide against the plurality of supporting rollers (5).

8. The furnace door lifting and clamping mechanism according to claim 1 or 2, characterized in that: A plurality of adjusting top screws (11) are installed at intervals on a side of the furnace door guide frame (1) close to the furnace opening. The plurality of adjusting top screws (11) abut against the furnace body outside the furnace opening, so that the furnace door guide frame (1) can be adjustably installed outside the furnace opening.

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