Muffle furnace upper door opening device with adjustable opening degree

Abstract

The invention relates to the technical field of muffle furnace door opening, in particular to a muffle furnace upper door opening device with an adjustable opening degree. The door opening and closing mechanism comprises a furnace door, a swing arm and a first elastic piece, and the first elastic piece is used for providing damping buffer for the movement process of the furnace door; the locking mechanism comprises a rotating shaft rotationally penetrating through the muffle furnace and clamping teeth arranged on the end face of the rotating shaft, the rotating shaft drives the clamping teeth to rotate step by step according to a set angle when rotating, buffering is conducted through a first elastic piece when the door is opened and closed, the opening degree of the furnace door is controlled through the locking mechanism, stepped door opening is achieved, and automatic locking is achieved after the set opening degree is reached. The furnace door can be freely switched between the locking state and the unlocking state through the hydraulic cylinder, the two sections of rotating shafts can relatively slide and synchronously rotate, and therefore switching of the opening and closing states of the furnace door is achieved, finally safety is improved, heat loss and opening and closing abrasion are reduced, the opening degree of the furnace door is adjusted according to needs, and the application scene is widened.

Description

Technical Field

[0001] The invention relates to the technical field of muffle furnace door opening, in particular to a muffle furnace upper door opening device with adjustable opening. Background Art

[0002] The muffle furnace is a highly efficient and energy-saving resistance furnace. It uses advanced heating technology and can heat the material to a high temperature in a short time. The working principle of the muffle furnace is to convert electrical energy into thermal energy and heat the material through resistance heating. When the current passes through the resistance wire of the muffle furnace, it will generate heat, heating the resistance wire, thereby heating the material. The heating speed of the muffle furnace is very fast, usually only a few seconds to heat the material to a high temperature. Uniform heating is a major feature of the muffle furnace. It can make the heating temperature of the material evenly distributed over the entire surface of the material, thereby avoiding local overheating.

[0003] Muffle furnaces usually open their doors horizontally to the left or right, and some also open their doors upwards. Muffle furnaces that open their doors upwards are mainly used in small spaces where it is inconvenient to open the doors. Usually, muffle furnaces that open their doors upwards are manually lifted with the assistance of springs or configuration blocks. The door panel opening of the muffle furnace only has two states: open / closed. When observing, it needs to be fully opened, and when a small batch of materials is put in, it needs to be fully opened, resulting in serious heat loss and affecting the uniform heating effect. The heated workpiece near the door panel cools too fast after the door is opened, which may cause thermal stress concentration and damage the furnace body or internal components. Therefore, a muffle furnace door opening method with adjustable opening is needed to solve this problem.

[0004] The existing Chinese patent with authorization announcement number CN217483219U discloses a muffle furnace with an upward opening door, comprising: a furnace body; a furnace door, a furnace door cover is arranged on the furnace body, and is used to seal the furnace body; a lifting module, the lifting module is connected to the furnace body and the furnace door, and is used to drive the furnace door to lift on the furnace body; a control box, the control box is arranged on the furnace body, and the control box is electrically connected to the furnace body and the lifting module, and is used to control the furnace body and the lifting module. The utility model adopts an electric method to lift and lower the furnace door, and the operation can be completed by pressing a button. There is no need to lift the furnace door manually, which saves manpower and is easy to operate. It is safe and convenient. The structure is simple, does not require a gantry and a counterweight, has a high degree of integration, and the lifting mechanism is completely installed inside the furnace body, which is beautiful and generous, and no additional installation is required after arriving at the work site.

[0005] However, in the above scheme, the upward-opening muffle furnace door can only be opened and closed up and down by a connecting rod. After reaching the highest point, there is no locking device and the opening cannot be adjusted in a step-by-step manner. The furnace door that opens up and down exerts a large pressure on the bearing, so there is a risk of falling and wear. At the same time, the existing muffle furnace door is relatively bulky. Therefore, the present application proposes a muffle furnace upper door opening device with adjustable opening. Summary of the invention

[0006] In view of the above problems in the prior art, the present invention is proposed.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a door opening device for a muffle furnace with adjustable opening, comprising: a muffle furnace, wherein an opening is formed on the muffle furnace;

[0008] The door opening and closing mechanism comprises a furnace door movably engaged with the outer wall of the opening, a swing arm is provided between the furnace door and the opening, when the swing arm swings, the furnace door is driven to separate from the opening and swing upward following the swing arm, and a first elastic member is further provided between the swing arm and the inner wall of the muffle furnace, and the first elastic member is used to provide damping buffering for the movement process of the furnace door;

[0009] The locking mechanism includes a rotating shaft that rotates and passes through the muffle furnace and a latching tooth arranged on the end surface of the rotating shaft. When the rotating shaft rotates, the latching tooth drives the latching tooth to rotate step by step according to the set angle. When the latching tooth rotates, the swing arm is driven to rotate. The latching tooth fixes and limits the swing arm and the furnace door by locking itself.

[0010] As a preferred solution of the upper door opening device of the muffle furnace with adjustable opening described in the present invention, a connecting plate is provided between the two pairs of swing arms located above the muffle furnace, and a hook is provided on the connecting plate.

[0011] As a preferred solution of the door opening device on the muffle furnace with adjustable opening described in the present invention, the muffle furnace is provided with an insulating chamber, a bracket is detachably provided in the insulating chamber, a V-shaped rod is rotatably provided on the bracket, and an extension rod is also fixed on the bracket.

[0012] As a preferred solution of the muffle furnace door opening device with adjustable opening described in the present invention, a first rotating column is rotatably provided in the V-shaped rod, a moving rod is fixedly provided on the end surface of the first rotating column, and a limiting arm is rotatably provided on the extension rod.

[0013] As a preferred solution of the muffle furnace upper door opening device with adjustable opening of the present invention, wherein: the limit arm is provided with a groove, the latching teeth are provided with a tooth block, the groove is engaged with the tooth block, and the moving rod is also movably engaged between each of the tooth blocks;

[0014] An eccentric wheel is arranged on the outer wall of one end of the rotating shaft close to the latching tooth. The eccentric wheel is eccentrically arranged on the outer wall of the rotating shaft. A collar is also rotatably sleeved on the outer wall of the eccentric wheel.

[0015] As a preferred solution of the muffle furnace upper door opening device with adjustable opening of the present invention, wherein: a first connecting rod is provided at the lower end of the outer wall of the collar, the lower end of the first connecting rod is rotatably connected to one end of the V-shaped rod, a rotating disk is fixedly sleeved on the outer wall of the rotating shaft, a boss is provided on the outer wall of the rotating disk, a rotating wheel is rotatably provided on the end surface of the limiting arm, and the rotating wheel rolls along the surface of the rotating disk;

[0016] The outer walls of the limit arm and the moving rod are both rotatably provided with hanging rings, an elastic component is arranged between the two hanging rings, and a hand wheel is arranged at one end of the rotating shaft that passes through the outside of the muffle furnace.

[0017] As a preferred solution of the muffle furnace upper door opening device with adjustable opening of the present invention, wherein: the elastic component includes a hydraulic cylinder, two sliding covers are slidably symmetrically arranged in the hydraulic cylinder, and the outer walls of the two sliding covers are respectively provided with a second elastic member and a third elastic member, and the second elastic member and the third elastic member are respectively connected to the limit arm and the lifting ring on the moving rod;

[0018] A supporting platform is arranged on the bracket, the rotating shaft rotates and passes through the supporting platform, a cavity is arranged on the supporting platform, a lifting cover is slidably arranged in the cavity, and a fourth elastic member is arranged between the cavity and the lifting cover.

[0019] As a preferred solution of the muffle furnace door opening device with adjustable opening described in the present invention, one end of the outer wall of the cavity is connected to an oil pipe, one end of the oil pipe is connected to the inside of the hydraulic cylinder, the oil pipe has three sections, and the third section of the oil pipe is horizontally arranged and rotatably connected to adjacent oil pipes and the hydraulic cylinder respectively.

[0020] As a preferred solution of the muffle furnace upper door opening device with adjustable opening of the present invention, wherein: a lever is rotatably provided on the support platform, a pressure rod is movably connected to the lower end surface of the lever, and the pressure rod slides through the interior of the cavity and is fixedly connected to the lifting cover;

[0021] The rotating shaft is divided into two sections, and a flat key is arranged between the two sections of the rotating shaft. The flat key enables the two sections of the rotating shaft to slide relative to each other and rotate synchronously at the same time. An adjusting disk is also sleeved on the outer wall of the rotating shaft near one end of the hand wheel, and a first locking groove, a rotating groove, a second locking groove and a locking groove are arranged on the adjusting disk in sequence.

[0022] As a preferred solution of the muffle furnace door opening device with adjustable opening described in the present invention, a first step is provided between the first locking groove and the rotating groove, a second step is provided between the second locking groove and the locking groove, and an adjustment block is provided at one end of the lever located on the adjustment disk.

[0023] The beneficial effects of the present invention are as follows: when the door is opened and closed, a buffer is provided through the first elastic member, the opening of the furnace door is controlled by the locking mechanism to realize stepped door opening, and the door is automatically locked after reaching the set opening; the furnace door can be freely switched between the locked and unlocked states through the hydraulic cylinder, and the two sections of the rotating shaft can slide relative to each other and rotate synchronously, thereby realizing the switching of the opening and closing states of the furnace door, ultimately improving safety, reducing heat loss and switch wear, adjusting the opening size of the furnace door as needed, and broadening the application scenarios; adding a spring to generate damping makes it convenient for the door panel to move up and down, while preventing collisions and violent airflow caused by the sudden fall and closing of the furnace door, thereby reducing heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0025] Figure 1 It is an overall schematic diagram of the upper door opening device of the muffle furnace with adjustable opening in the present invention;

[0026] Figure 2 It is a schematic diagram of opening the furnace door of the muffle furnace in the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the heat insulation cavity in the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the swing arm area in the present invention;

[0029] Figure 5 It is a schematic diagram of the regional structure of the locking mechanism in the present invention;

[0030] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of region A;

[0031] Figure 7 It is a schematic diagram of the eccentric wheel area in the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the adjustment disk area in the present invention.

[0033] Reference numerals: 100, muffle furnace; 101, opening;

[0034] 200, furnace door; 2001, hydraulic cylinder; 2002, sliding cover; 2003, second elastic member; 2004, third elastic member; 2005, supporting platform; 2006, cavity; 2007, lifting cover; 2008, fourth elastic member; 2009, oil pipe; 201, swing arm; 2011, lever; 2012, pressure rod; 2013, first locking groove; 2014, rotating groove; 2015, second locking groove; 2016, locking groove; 2017, first step; 2018, second step; 2019, adjusting block; 202, first elastic member; 2021, adjusting disk; 203, connecting plate;

[0035] 300, rotating shaft; 3001, heat insulation cavity; 3002, bracket; 3003, V-shaped rod; 3004, first rotating column; 3005, extension rod; 3006, moving rod; 3007, limiting arm; 3008, groove; 3009, tooth block; 301, latch tooth; 3011, eccentric wheel; 3012, collar; 3013, first connecting rod; 3014, turntable; 3015, boss; 3016, rotating wheel; 3017, lifting ring; 3018, elastic component; 3019, handwheel; 3031, flat key. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1

[0040] Reference Figures 1 to 8 , which is the first embodiment of the present invention, provides a muffle furnace upper door opening device with adjustable opening, including a muffle furnace 100, a door opening and closing mechanism and a locking mechanism, which realizes upward door opening, and the first elastic member 202 is used for buffering when the door is opened and closed.

[0041] Specifically, they include:

[0042] A muffle furnace 100, wherein an opening 101 is formed on the muffle furnace 100;

[0043] The door opening and closing mechanism comprises a furnace door 200 movably engaged with the outer wall of the opening 101, a swing arm 201 is provided between the furnace door 200 and the opening 101, when the swing arm 201 swings, the furnace door 200 is driven to separate from the opening 101 and swing upward with the swing arm 201, and a first elastic member 202 is further provided between the swing arm 201 and the inner wall of the muffle furnace 100, and the first elastic member 202 is used to provide damping buffering for the movement process of the furnace door 200;

[0044] The locking mechanism includes a rotating shaft 300 that rotates and passes through the muffle furnace 100 and a latch 301 arranged on the end face of the rotating shaft 300. When the rotating shaft 300 rotates, the latch 301 is driven to rotate step by step according to the set angle. When the latch 301 rotates, it drives the swing arm 201 to rotate. The latch 301 fixes and limits the swing arm 201 and the furnace door 200 by locking itself.

[0045] Among them, one end of the swing arm 201 is rotatably set on the inner wall of the opening 101, and the other end is rotatably set on the inner wall of the furnace door 200. There are four sets of swing arms 201 in total, and they are symmetrically distributed in groups of two on both sides of the inner walls of the furnace door 200. The two sets of swing arms 201 in the same group are arranged in parallel.

[0046] Preferably, one end of the swing arm 201 close to the opening 101 extends outward and is connected to a first elastic member 202, which is a spring. When the swing arm 201 drives the furnace door 200 to move, a damping force is provided for buffering, thereby preventing the furnace door 200 from falling suddenly and causing excessive airflow to generate dust or affect the uniformity of the heating atmosphere in the muffle furnace 100.

[0047] More preferably, in other embodiments, the first elastic member 202 may be a hydraulic damping rod, which can play a buffering role when the furnace door 200 is lifted and closed, and is less affected by the high temperature in the muffle furnace 100.

[0048] Among them, when the furnace door 200 is closed, the end of the swing arm 201 close to the furnace door 200 is set higher than the end of the furnace door opening 101, and when the furnace door 200 is opened, the end of the swing arm 201 close to the furnace door 200 is lower than the end of the furnace door opening 101.

[0049] A connecting plate 203 is provided between the two pairs of swing arms 201 above the muffle furnace 100 , and a hook is provided on the connecting plate 203 .

[0050] Furthermore, the connecting plate 203 connects two pairs of swing arms 201 that are far apart, so that the rotation of each swing arm 201 is more synchronized. The hook corners are made of soft sintered material to prevent the furnace door 200 from directly contacting the outer shell of the sintering furnace 100 after it is flipped upward and opened, thereby preventing the outer shell from being burned by high temperature and avoiding safety accidents caused by accidentally touching the outer shell.

[0051] Furthermore, the connecting plate 203 in the present invention is attached to the outer shell of the sintering furnace 100 when the furnace door 200 is opened, thereby preventing hot air from flowing upward and avoiding excessive heat loss in the muffle furnace 100.

[0052] Among them, the swing arm 201 and the first elastic member 202 in this embodiment are made of high temperature resistant materials to adapt to the high temperature environment in the muffle furnace. The rotating shaft 300 is driven and controlled by a servo motor, and the furnace door 200 of the muffle furnace 100 is controlled to open and close upward through the electronic control system to improve safety.

[0053] More preferably, in other embodiments, the swing arm 201 may not be directly rotatably connected to the furnace door 200 and the opening 101, but an adjustment groove may be opened on the opening 101 and the furnace door 200, an adjustment block is slidably provided in the adjustment groove, and the swing arm 201 is rotatably set on the adjustment block. The adjustment block can slide in the adjustment groove and be fixed by a top screw, so that when the muffle furnace 100 is inspected and repaired, the furnace door 200 can continue to slide up and down after being opened by moving the position of the adjustment block, thereby realizing the adjustment of the up and down opening degree of the furnace door 200.

[0054] Example 2

[0055] Reference Figures 1 to 8 , which is the second embodiment of the present invention, is based on the previous embodiment, but differs in that the opening of the furnace door 200 is controlled by a locking mechanism to achieve step-by-step door opening, and is automatically locked after reaching the set opening.

[0056] Specifically, a heat-insulating chamber 3001 is provided in the muffle furnace 100 , and a bracket 3002 is detachably provided in the heat-insulating chamber 3001 . A V-shaped rod 3003 is rotatably provided on the bracket 3002 , and an extension rod 3005 is also fixedly provided on the bracket 3002 .

[0057] More preferably, a first rotating column 3004 is rotatably provided inside the V-shaped rod 3003 , a moving rod 3006 is fixedly connected to the end surface of the first rotating column 3004 , and a limiting arm 3007 is rotatably provided on the extension rod 3005 .

[0058] The limiting arm 3007 is provided with a groove 3008 , the latching tooth 301 is provided with a tooth block 3009 , the groove 3008 is engaged with the tooth block 3009 , and the moving rod 3006 is also movably engaged between the tooth blocks 3009 .

[0059] The latching tooth 301 is in the shape of a disc, and the tooth blocks 3009 are distributed in a circumferential array on the outer wall of the latching tooth 301 . The latching tooth 301 is fixedly connected with the rotation fulcrum of the swing arm 201 coaxially, so that the latching tooth 301 rotates synchronously with the swing arm 201 .

[0060] More preferably, an eccentric wheel 3011 is provided on the outer wall of one end of the rotating shaft 300 close to the latching tooth 301 . The eccentric wheel 3011 is eccentrically arranged on the outer wall of the rotating shaft 300 . A ring 3012 is also rotatably sleeved on the outer wall of the eccentric wheel 3011 .

[0061] Furthermore, a first connecting rod 3013 is provided at the lower end of the outer wall of the collar 3012 , and the lower end of the first connecting rod 3013 is rotatably connected to one end of the V-shaped rod 3003 .

[0062] Preferably, a rotating disk 3014 is fixedly sleeved on the outer wall of the rotating shaft 300 , a boss 3015 is provided on the outer wall of the rotating disk 3014 , and a rotating wheel 3016 is rotatably provided on the end surface of the limiting arm 3007 , and the rotating wheel 3016 rolls along the surface of the rotating disk 3014 .

[0063] The diameter of the rotating disk 3014 is larger than that of the eccentric wheel 3011 . The eccentric wheel 3011 and the rotating disk 3014 are both fixedly engaged with the outer wall of the rotating shaft 300 . The first connecting rod 3013 is vertically downwardly arranged on the outer wall of the collar 3012 .

[0064] Preferably, the boss 3015 is a raised arc-shaped block that fits the turntable 3014, and the wheel 3016 rolls along the surface of the boss 3015 when it slides onto the boss 3015. In the present embodiment, when the shaft 300 rotates clockwise, the boss 3015 and the eccentric wheel 3011 rotate synchronously, and the boss 3015 is located on the outer wall of the eccentric wheel 3011 farthest from the center of the shaft 300, so that when the wheel 3016 rotates onto the boss 3015, the eccentric wheel 3011 drives the ring 3012 to move downward.

[0065] Furthermore, the outer walls of the limiting arm 3007 and the moving rod 3006 are rotatably provided with a hanging ring 3017, an elastic component 3018 is provided between the two hanging rings 3017, and a hand wheel 3019 is provided at one end of the rotating shaft 300 that passes through the outside of the muffle furnace 100.

[0066] In this embodiment, the elastic component 3018 is a spring, which is used to pull the two together, so that the limit arm 3007 and the moving rod 3006 are tightly attached to the surface of the latch 301. The diameter of the handwheel 3019 is set according to the weight of the furnace door 200 to achieve a labor-saving effect. At the same time, the operator can open the door by standing on the side of the muffle furnace 100 to avoid facing the high temperature inside the furnace body and reduce safety accidents caused by high temperature in the furnace.

[0067] In summary, when in use, the operator only needs to turn the hand wheel 3019 to drive the rotating shaft 300 to rotate, and the rotation of the rotating shaft 300 simultaneously drives the eccentric wheel 3011 and the rotating disk 3014 to rotate. In the initial state, the eccentric wheel 3011 rotates from the end with a smaller diameter to the end with a larger diameter, thereby driving the first connecting rod 3013 to move upward from bottom to top through the collar 3012, and at the same time driving the V-shaped rod 3003 to rotate around the rotating fulcrum on the bracket 3002, and the V-shaped The other end of the rod 3003 drives the moving rod 3006 to move away from the rotating shaft 300 through the first rotating column 3004. At the same time, the moving rod 3006 is pulled by the spring to fit against the surface of the tooth block 3009, so that the moving rod 3006 disengages from the engagement with each tooth block 3009 and slides outward along its surface until the V-shaped rod 3003 moves to the outermost part, and the moving rod 3006 falls back into the gap between the new tooth blocks 3009 and is re-engaged in the inner wall of the gap.

[0068] At the same time, when the rotating wheel 3016 rotates to the boss 3015, the eccentric wheel 3011 drives the collar 3012 to move downward. At this time, the rotating wheel 3016 first drives the limit arm 3007 to swing upward, so that the groove 3008 disengages from the latch tooth 301, releasing the locking limit of the latch tooth 301, and then the collar 3012 moves downward to drive the V-shaped rod 3003 to rotate counterclockwise in the opposite direction, so that the moving rod 3006 fits between the tooth blocks 3009 and pushes the latch teeth 301 to rotate. The rotation of the latch teeth 301 drives the swing arm 201 to rotate, thereby opening the furnace door 200. In this embodiment, 18 latch teeth 301 are provided. For each rotation of the latch teeth 301 by a distance of a tooth block 3009, the swing arm 201 rotates 20°. When the swing arm 201 rotates from the lowest point to the highest point, the furnace door 200 is in an open state.

[0069] Finally, when the shaft 300 rotates to the initial state again, the wheel 3016 rolls off the boss 3015, and the groove 3008 on the limit arm 3007 engages with the tooth block 3009, thereby locking the latch 301, so that each swing arm 201 is stuck, thereby achieving automatic locking of the furnace door 200.

[0070] Example 3

[0071] Reference Figure 1-Figure 8 , which is the third embodiment of the present invention, is based on the previous embodiment, except that the furnace door 200 can be freely switched between the locked and unlocked states through the hydraulic cylinder 2001.

[0072] Specifically, the elastic component 3018 includes a hydraulic cylinder 2001, in which two sliding covers 2002 are slidably symmetrically arranged, and the outer walls of the two sliding covers 2002 are respectively provided with a second elastic member 2003 and a third elastic member 2004, and the second elastic member 2003 and the third elastic member 2004 are respectively connected to the limit arm 3007 and the lifting ring 3017 on the moving rod 3006.

[0073] The hydraulic cylinder 2001 is hollow inside, and the sliding cover 2002 is slidably fitted on the inner wall of the hydraulic cylinder 2001, thereby forming a closed cavity inside the hydraulic cylinder 2001, and the closed cavity is filled with flame-resistant hydraulic oil.

[0074] Furthermore, a supporting platform 2005 is provided on the bracket 3002 , and the rotating shaft 300 rotates through the supporting platform 2005 . A cavity 2006 is provided on the supporting platform 2005 , and a lifting cover 2007 is slidably provided in the cavity 2006 . A fourth elastic member 2008 is provided between the cavity 2006 and the lifting cover 2007 .

[0075] Preferably, an oil pipe 2009 is connected to one end of the outer wall of the cavity 2006, and the other end of the oil pipe 2009 is connected to the inside of the hydraulic cylinder 2001. The oil pipe 2009 has three sections. The third section of the oil pipe 2009 is horizontally arranged and rotatably connected to the adjacent oil pipe 2009 and the hydraulic cylinder 2001 respectively.

[0076] In this embodiment, the oil pipe 2009 is made of heat-resistant plastic material, and the hydraulic cylinder 2001 follows. The hydraulic cylinder 2001 can rotate relative to the third section of the oil pipe 2009, and can also rotate horizontally at a certain angle following the third section of the oil pipe 2009, thereby performing corresponding displacement when the limiting arm 3007 and the moving rod 3006 move.

[0077] For example, in the initial state, the hydraulic oil level in the hydraulic cylinder 2001 is low, so the two sliding covers 2002 are pushed closer to each other by the atmospheric pressure, so that the second elastic member 2003 and the third elastic member 2004 are closer to each other, the pulling force on the limit arm 3007 and the moving rod 3006 is increased, the fitting force on the latch 301 is enhanced, and the locking effect of the furnace door 200 is improved;

[0078] At the same time, when the hydraulic cylinder 2001 is filled with high-pressure hydraulic oil, the two sliding covers 2002 move away from each other, the second elastic member 2003 and the third elastic member 2004 move away from each other, pushing the limiting arm 3007 and the moving rod 3006 away from the latching tooth 301, thereby releasing the limit on the furnace door 200.

[0079] Example 4

[0080] Reference Figure 1-Figure 8, which is the fourth embodiment of the present invention. This embodiment is based on the previous embodiment, but differs in that the rotating shaft 300 is divided into two sections, and the two sections of the rotating shaft 300 can slide relative to each other and rotate synchronously, thereby realizing the switching of the opening and closing and locking states of the furnace door 200.

[0081] Specifically, a lever 2011 is rotatably provided on the supporting platform 2005 , and a pressure rod 2012 is movably connected to the lower end surface of the lever 2011 . The pressure rod 2012 slides through the interior of the cavity 2006 and is fixedly connected to the lifting cover 2007 .

[0082] Among them, the lever 2011 is spliced ​​by three rectangular plates with obtuse angles, the pressure rod 2012 is slidingly and sealingly connected to the cavity 2006, and the side of the cavity 2006 located below the lifting cover 2007 is also filled with hydraulic oil. Among them, the pressure rod 2012 is connected to the lever 2011 through a universal joint, and the pressure rod 2012 is made of elastic material and has a certain elasticity.

[0083] More preferably, the rotating shaft 300 is divided into two sections, and a flat key 3031 is provided between the two sections of the rotating shaft 300. The flat key 3031 allows the two sections of the rotating shaft 300 to slide relative to each other and rotate synchronously at the same time. The outer wall of the rotating shaft 300 near one end of the handwheel 3019 is also sleeved with an adjusting disk 2021, and the adjusting disk 2021 is provided with a first locking groove 2013, a rotating groove 2014, a second locking groove 2015 and a locking groove 2016 in sequence.

[0084] Among them, a first step 2017 is provided between the first locking groove 2013 and the rotating groove 2014, a second step 2018 is provided between the second locking groove 2015 and the locking groove 2016, and an adjusting block 2019 is provided at one end of the lever 2011 located on the adjusting disk 2021, and the adjusting block 2019 is slidably engaged with the first locking groove 2013 and the second locking groove 2015 respectively.

[0085] Furthermore, the first step 2017 and the second step 2018 are both arc-shaped, so that the diameter is highest at the first locking groove 2013 and lowest at the locking groove 2016. The adjustment block 2019 can slide along the surface of the first step 2017 and the second step 2018 to switch between different areas.

[0086] Exemplarily, a pointer is provided at one end of the first rotating column 3004 close to the V-shaped rod 3003, and a limit column is provided on the end face of the V-shaped rod 3003. When the pointer moves to fit the limit column, the moving rod 3006 disengages from the surface of the latch tooth 301, and the first rotating column 3004 cannot continue to rotate. As a result, as the second elastic member 2003 and the third elastic member 2004 continue to move away from each other, the limit arm 3007 disengages from the latch tooth 301 and releases the lock.

[0087] In summary, when in use, in the initial state, the handwheel 3019 and the rotating shaft 300 are pulled outward to the outermost point, at which time the adjusting block 2019 is located at the locking groove 2016, and the height of the adjusting block 2019 on the lever 2011 is the lowest. Due to the lever effect, the lever 2011 at the other end is driven to move upward through the soft-connected pressure rod 2012, so that the lifting cover 2007 moves upward, and the hydraulic oil in the cavity 2006 is drawn upward, and the oil pressure in the hydraulic cylinder 2001 is reduced through the oil pipe 2009, and the locking tooth 301 is engaged and limited by the limiting arm 3007, and at the same time, the rotating shaft 300 is also locked with the supporting platform 2005 for double locking.

[0088] At the same time, when the rotating shaft 300 is pushed inward until the adjusting block 2019 enters the rotating groove 2014 along the second step 2018, the rotation lock of the rotating shaft 300 is released, and the rotating shaft 300 is continued to be rotated to adjust the angle of the furnace door 200; the rotating shaft 300 is continued to be pushed until the adjusting block 2019 enters the first locking groove 2013 along the first step 2017. At this time, the adjusting block 2019 on the lever 2011 is at the highest height, and the pressure rod 2012 moves downward, and the lifting cover 2007 moves downward to drive the hydraulic oil in the cavity 2006 to be pumped downward into the hydraulic cylinder 2001, so that the two sliding covers 2002, the second elastic member 2003 and the third elastic member 2004 move away from each other, pushing the limiting arm 3007 and the moving rod 3006 away from the latching tooth 301, thereby releasing the limit of the furnace door 200, so that the furnace door 200 can slowly fall and close under the drive of the first elastic member 202.

[0089] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values, such as temperature, pressure, etc., installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0090] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0091] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0092] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A door opening device for a muffle furnace with adjustable opening, characterized in that: include: A muffle furnace (100), wherein the muffle furnace (100) is provided with an opening (101); A door opening and closing mechanism comprises a furnace door (200) movably engaged with the outer wall of the opening (101); a swing arm (201) is provided between the furnace door (200) and the opening (101); when the swing arm (201) swings, the furnace door (200) is driven to separate from the opening (101) and to swing upward following the swing arm (201); a first elastic member (202) is further provided between the swing arm (201) and the inner wall of the muffle furnace (100); the first elastic member (202) is used to provide damping and buffering for the movement process of the furnace door (200); The locking mechanism comprises a rotating shaft (300) that rotates and passes through the muffle furnace (100) and a latching tooth (301) provided on the end surface of the rotating shaft (300); when the rotating shaft (300) rotates, the latching tooth (301) is driven to rotate step by step according to a set angle; when the latching tooth (301) rotates, the swing arm (201) is driven to rotate; and the latching tooth (301) is locked by itself to fix and limit the swing arm (201) and the furnace door (200).

2. The muffle furnace upper door opening device with adjustable opening as claimed in claim 1, characterized in that: A connecting plate (203) is provided between two pairs of swing arms (201) located above the muffle furnace (100), and a hook is provided on the connecting plate (203).

3. The muffle furnace upper door opening device with adjustable opening as claimed in claim 2, characterized in that: The muffle furnace (100) has an insulating chamber (3001) formed therein, a bracket (3002) is detachably provided in the insulating chamber (3001), a V-shaped rod (3003) is rotatably provided on the bracket (3002), and an extension rod (3005) is also fixedly provided on the bracket (3002).

4. The upper door opening device of a muffle furnace with adjustable opening as claimed in claim 3, characterized in that: A first rotating column (3004) is rotatably provided inside the V-shaped rod (3003), a moving rod (3006) is fixedly provided on the end surface of the first rotating column (3004), and a limiting arm (3007) is rotatably provided on the extension rod (3005).

5. The upper door opening device of a muffle furnace with adjustable opening as claimed in claim 4, characterized in that: The limiting arm (3007) is provided with a groove (3008), the latching tooth (301) is provided with a tooth block (3009), the groove (3008) is engaged with the tooth block (3009), and the moving rod (3006) is also movably engaged between each of the tooth blocks (3009); An eccentric wheel (3011) is provided on the outer wall of one end of the rotating shaft (300) close to the latching tooth (301). The eccentric wheel (3011) is eccentrically arranged on the outer wall of the rotating shaft (300). A collar (3012) is also rotatably sleeved on the outer wall of the eccentric wheel (3011).

6. The muffle furnace upper door opening device with adjustable opening as claimed in claim 5, characterized in that: A first connecting rod (3013) is provided at the lower end of the outer wall of the collar (3012), and the lower end of the first connecting rod (3013) is rotatably connected to one end of the V-shaped rod (3003). A rotating disk (3014) is also fixedly sleeved on the outer wall of the rotating shaft (300), and a boss (3015) is provided on the outer wall of the rotating disk (3014). A rotating wheel (3016) is rotatably provided on the end surface of the limiting arm (3007), and the rotating wheel (3016) rolls along the surface of the rotating disk (3014); The outer walls of the limiting arm (3007) and the moving rod (3006) are both rotatably provided with a hanging ring (3017), an elastic component (3018) is provided between the two hanging rings (3017), and a hand wheel (3019) is provided at one end of the rotating shaft (300) that passes through the outside of the muffle furnace (100).

7. The muffle furnace upper door opening device with adjustable opening as claimed in claim 6, characterized in that: The elastic component (3018) comprises a hydraulic cylinder (2001), two sliding covers (2002) are slidably symmetrically arranged inside the hydraulic cylinder (2001), the outer walls of the two sliding covers (2002) are respectively provided with a second elastic member (2003) and a third elastic member (2004), and the second elastic member (2003) and the third elastic member (2004) are respectively connected to the limit arm (3007) and the lifting ring (3017) on the moving rod (3006); The support (3002) is provided with a supporting platform (2005), the rotating shaft (300) rotates through the supporting platform (2005), a cavity (2006) is provided on the supporting platform (2005), a lifting cover (2007) is slidably provided in the cavity (2006), and a fourth elastic member (2008) is provided between the cavity (2006) and the lifting cover (2007).

8. The upper door opening device of a muffle furnace with adjustable opening as claimed in claim 7, characterized in that: An oil pipe (2009) is connected to one end of the outer wall of the cavity (2006), and one end of the oil pipe (2009) is connected to the inside of the hydraulic cylinder (2001). The oil pipe (2009) has three sections. The third section of the oil pipe (2009) is horizontally arranged and rotatably connected to adjacent oil pipes (2009) and the hydraulic cylinder (2001).

9. The upper door opening device of a muffle furnace with adjustable opening as claimed in claim 8, characterized in that: A lever (2011) is rotatably provided on the support platform (2005), and a pressure rod (2012) is movably connected to the lower end surface of the lever (2011), and the pressure rod (2012) slides through the interior of the cavity (2006) and is fixedly connected to the lifting cover (2007); The rotating shaft (300) is divided into two sections, and a flat key (3031) is provided between the two sections of the rotating shaft (300). The flat key (3031) enables the two sections of the rotating shaft (300) to slide relative to each other and rotate synchronously at the same time. The outer wall of the rotating shaft (300) close to one end of the hand wheel (3019) is also sleeved with an adjusting disk (2021), and the adjusting disk (2021) is sequentially provided with a first locking groove (2013), a rotating groove (2014), a second locking groove (2015) and a locking groove (2016).

10. The muffle furnace upper door opening device with adjustable opening as claimed in claim 9, characterized in that: A first step (2017) is provided between the first locking groove (2013) and the rotating groove (2014), a second step (2018) is provided between the second locking groove (2015) and the locking groove (2016), and an adjustment block (2019) is provided at one end of the lever (2011) located on the adjustment disk (2021).

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