A hinge limiting device and hinge for the door of a vacuum furnace

Abstract

The present application relates to a hinge limit device and a hinge for a door of a vacuum furnace, belonging to the technical field of hinges. A hinge limit device for a door of a vacuum furnace includes a limit plate and a limit pin. A limit sleeve is sleeved on the outer end of the limit pin, and an elastic member in a compressed state is arranged between the limit pin and the limit sleeve. Two ends of the elastic member act on the limit pin and the limit sleeve respectively. An arc-shaped groove is formed in the limit plate, and the depth of the arc-shaped groove gradually increases along the opening direction thereof. One end of the limit pin abuts against the bottom wall of the arc-shaped groove and slides along the arc-shaped groove. During the process that the limit pin slides from the bottom wall at the lower end of the arc-shaped groove to the bottom wall at the upper end, the limit pin moves away from the limit plate to cause the elastic member to contract, and the contracted elastic member applies pressure to the bottom wall of the arc-shaped groove to increase the friction force between the limit rod and the bottom wall of the arc-shaped groove, and the hinge is limited by the action of the friction force. When the limit pin needs to be unlocked, the limit pin is slid in the reverse direction to complete the unlocking, achieving the effect of higher safety performance.

Description

Technical Field

[0001] The present application relates to the technical field of hinges, and in particular to a hinge limiting device and a hinge for a vacuum furnace door. Background Art

[0002] A hinge is a device used to connect a door and a door frame. It allows the door to rotate and open at its fixed position, providing the door with the function of opening and closing. In order to maintain the door open or closed, a limit device is added to the hinge. The traditional limit device is a positioning pin structure. When the door panel rotates to the position that needs to be limited, the positioning pin is inserted into the corresponding limit hole. When unlocking is required, the positioning pin is pulled out. There is a problem that manual operation is required for locking and unlocking, which wastes manpower.

[0003] In order to improve the degree of automation of the limit device, the locating pin will be connected to the hinge and a spring in a compressed state will be mounted on the locating pin. The locating pin will rotate with the rotation of the hinge. When the hinge rotates to the locking point with a limit hole, the spring will stretch and the locating pin will automatically enter the limit hole to complete the locking.

[0004] Although this method improves the degree of automation during locking, when unlocking, it is necessary to lift the limit pin and rotate the hinge to make the limit pin disengage from the limit hole, which is more troublesome to operate. The vacuum furnace door is used as the inlet and outlet of the equipment, which generally has a high temperature. The high temperature on the inlet and outlet side during operation can easily cause harm to relevant personnel, posing a great safety hazard. Summary of the invention

[0005] The purpose of the present application is to provide a hinge limiting device and hinge for a vacuum furnace door with higher safety performance.

[0006] In the first aspect, the hinge limiting device for a vacuum furnace door provided in the present application adopts the following technical solution:

[0007] A hinge limit device for a vacuum furnace door comprises a limit plate and a limit pin, wherein the outer end of the limit pin is sleeved with a limit sleeve, an elastic member in a compressed state is arranged between the limit pin and the limit sleeve, the two ends of the elastic member act on the limit pin and the limit sleeve respectively, an arc-shaped groove is opened on the limit plate, the depth of the arc-shaped groove gradually increases along the opening direction thereof, and one end of the limit pin abuts against the bottom wall of the arc-shaped groove and slides along the arc-shaped groove.

[0008] By adopting the above technical solution, since the bottom wall of the arc-shaped groove has a slope, when the limit pin slides from the bottom wall at the lower end of the arc-shaped groove to the bottom wall at the upper end, the limit pin gradually moves away from the limit plate. At this time, the elastic member continuously contracts, so that the pressure exerted by the end of the limit pin close to the arc-shaped groove on the bottom wall of the arc-shaped groove gradually increases, thereby increasing the friction between the limit rod and the bottom wall of the arc-shaped groove and making it more difficult to slide the limit pin. When the limit pin slides to the bottom wall at the upper end of the arc-shaped groove, the compression degree of the spring is the largest and the limit pin is locked. When it needs to be unlocked, overcome the friction between the limit pin and the bottom wall of the arc-shaped groove and slide the limit pin in the reverse direction to complete the unlocking, which is easier to operate and has higher safety compared to synchronously rotating the door panel when lifting the limit pin.

[0009] Optionally, the limit sleeve includes a fixed sleeve and an adjusting sleeve. The fixed sleeve and the adjusting sleeve are sleeved and the distance therebetween is adjustable. One end of the adjusting sleeve away from the fixed sleeve is contracted to have an annular plate. The end of the limit pin away from the arc-shaped groove passes through the annular plate, and one end of the elastic member abuts against the annular plate.

[0010] After long-term door opening and closing operations, the telescopic effect of the elastic element gradually decreases. By adopting the above technical solution, adjusting the distance between the fixed sleeve and the adjusting sleeve can change the telescopic state of the elastic element to improve the limiting effect. During the sliding process of the limit pin, the adjusting sleeve can also be rotated to stretch the spring to reduce the difficulty of sliding the limit pin, which is convenient to operate.

[0011] Optionally, the limit pin includes a rod body and a limit convex edge. The limit convex edge is sleeved on the rod body and connected to the rod body. The elastic member is sleeved on the rod body and the other end of the elastic member abuts against the wall surface of the limit convex edge.

[0012] By adopting the above technical solution, since the two ends of the elastic element respectively abut against the limit convex edge and the annular plate, during the process of the rod body moving away from the limit plate, the limit convex edge synchronously moves away from the limit plate, while the distance between the limit sleeve and the limit plate remains unchanged, so that the limit convex edge exerts pressure on the elastic element to cause the elastic element to contract, and the structure is simple.

[0013] Optionally, the outer diameter of the limit convex edge is smaller than the inner diameter of the adjusting sleeve.

[0014] Since the elastic member contracts due to the movement of the limit convex edge away from the limit plate, the limit convex edge will gradually approach the adjusting sleeve during the movement of the limit convex edge. By adopting the above technical solution, it is possible to avoid the situation that the limit convex edge abuts against the end of the adjusting sleeve close to the limit plate during the compression process of the elastic member, resulting in difficulty in further adjusting the spring.

[0015] Optionally, the limit convex edge is detachably connected to the rod body.

[0016] The expansion and contraction of the elastic member is mainly driven by the limiting convex edge. During the process of the limiting convex edge compressing the elastic member, the elastic member will also exert a pressure on the limiting convex edge, which easily causes damage to the limiting convex edge. By adopting the above technical solution, after the limiting convex edge is damaged, the limiting convex edge is disassembled and a new one is replaced to reduce the maintenance cost of the limit pin.

[0017] Optionally, one end of the limit pin close to the limit plate is spherical.

[0018] By adopting the above technical solution, the smoothness of the rod body sliding in the arc-shaped groove is improved.

[0019] Optionally, the limit plate is arc-shaped, and a positioning groove for matching with the hinge is provided on the outer wall of one side of the limit plate.

[0020] By adopting the above technical solution, the hinge and the limit plate cooperate to improve the concentration degree of the hinge and the hinge limiting device, and improve the stability of the limit pin rotating along the arc-shaped groove.

[0021] Optionally, a connecting plate for connecting with the hinge is provided at one end of the fixed sleeve far from the adjusting sleeve, and a through hole for the limit pin to pass through is provided on the connecting plate.

[0022] By adopting the above technical solution, the fixed sleeve is stably connected with the hinge to ensure that when the hinge rotates, it can drive the fixed sleeve and the limit pin inside the fixed sleeve to slide along the arc-shaped groove.

[0023] Optionally, it further includes an adjusting block. A through hole matching with the adjusting block is provided on the bottom wall at the high end of the arc-shaped groove, and the adjusting block is threadedly connected with the inner wall of the through hole.

[0024] By adopting the above technical solution, when the limit pin slides to the bottom wall at the high end of the arc-shaped groove, at this time, an adjustable wrench is inserted from one side of the installation hole to rotate the adjusting block, so that the adjusting block moves away from the limit plate. At this time, the elastic element expands, and the spherical end of the limit pin falls into the through hole and is limited by the peripheral side wall of the through hole, so as to reduce the possibility of danger due to too many surrounding people. Relevant personnel can also rotate the adjusting block to choose to lock the furnace door with friction or the peripheral side wall of the through hole, which has stronger versatility and higher safety.

[0025] In a second aspect, a hinge provided by the present application adopts the following technical solution:

[0026] A hinge includes a hinge seat, a hinge rod and a hinge limiting device. The hinge rod is rotatably connected to the hinge seat. A fixing plate for connecting with a door panel is connected to the hinge rod. The limiting sleeve is connected to the fixing plate, and the limiting plate is connected to the hinge seat.

[0027] By adopting the above technical solution, during the rotation of the hinge rod relative to the hinge seat, the fixing plate drives the limiting sleeve to rotate, causing the limiting pin located within the limiting sleeve to slide along the arc-shaped groove, thereby ensuring stable limiting of the hinge by the limiting pin.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. In the present application, the depth of the arc-shaped groove gradually increases along its opening direction. Since the bottom wall of the arc-shaped groove has a slope, when the limiting pin slides from the bottom wall at the lower end of the arc-shaped groove to the bottom wall at the upper end, the limiting pin gradually moves away from the limiting plate. At this time, the elastic member continuously contracts, causing the pressure exerted by the end of the limiting pin close to the arc-shaped groove on the bottom wall of the arc-shaped groove to gradually increase, thereby increasing the friction between the limiting rod and the bottom wall of the arc-shaped groove and making it more difficult to slide the limiting pin. When the limiting pin slides to the bottom wall at the upper end of the arc-shaped groove, the compression degree of the spring is the largest, and the limiting pin is locked. When unlocking is required, overcome the friction between the limiting pin and the bottom wall of the arc-shaped groove and slide the limiting pin in the reverse direction to complete the unlocking, which is easier to operate and has higher safety compared to synchronously rotating the door panel when lifting the limiting pin.

[0030] 2. In the present application, the distance between the fixed sleeve and the adjusting sleeve is adjustable. By adjusting the distance between the fixed sleeve and the adjusting sleeve, the expansion and contraction state of the elastic element can be changed to improve the limiting effect. During the sliding process of the limiting pin, the adjusting sleeve can also be rotated to stretch the spring to reduce the difficulty of sliding the limiting pin, which is convenient to operate.

[0031] 3. In the present application, the two ends of the elastic element are respectively in contact with the limiting convex edge and the annular plate. During the movement of the rod body away from the limiting plate, the limiting convex edge synchronously moves away from the limiting plate, while the distance between the limiting sleeve and the limiting plate remains unchanged, causing the limiting convex edge to exert pressure on the elastic element and causing the elastic element to contract, with a simple structure. Description of the Drawings

[0032] Figure 1 is a three-dimensional structural schematic diagram of the hinge limiting device and the hinge in Embodiment 1 of the present application.

[0033] Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in

[0034] Figure 3 is a three-dimensional structural schematic diagram of the limiting plate in Embodiment 1 of the present application.

[0035] Figure 4 is a cross-sectional structural schematic diagram of the limiting pin and the limiting sleeve in Embodiment 1 of the present application.

[0036] Figure 5It is an exploded structural schematic diagram of the hinge limiting device and the hinge seat in Embodiment 2 of the present application.

[0037] In the figure, 1 is a limit plate; 11 is an arc-shaped groove; 111 is a locking point; 112 is a movable point; 12 is a positioning groove; 13 is a through hole; 14 is a fixing hole; 2 is a limit pin; 21 is a rod body; 22 is a limit flange; 3 is a limit sleeve; 31 is a fixing sleeve; 32 is an adjusting sleeve; 33 is an annular plate; 4 is an elastic member; 5 is a connecting plate; 51 is a through hole for passing through; 6 is an adjusting block; 7 is a hinge; 71 is a hinge seat; 711 is a first mounting plate; 712 is a second mounting plate; 7121 is a through hole; 7122 is a mounting hole; 713 is a reinforcing rib; 72 is a hinge rod; 73 is a fixing plate. Specific embodiments

[0038] The following Figure 1 - attached Figure 5 is used to further describe the present application in detail.

[0039] Embodiment 1:

[0040] A hinge 7, referring to Figure 1 includes a hinge seat 71, a hinge rod 72 and a hinge 7 limiting device for the door of a vacuum furnace. The hinge rod 72 is rotatably connected to the hinge seat 71, and a fixing plate 73 for connecting to the door panel is connected to the hinge rod 72. Combining Figure 2 the hinge 7 limiting device for the door of a vacuum furnace includes a limit plate 1 and a limit pin 2. The limit plate 1 is detachably connected to the hinge seat 71 by bolts, and the limit pin 2 is connected to the fixing plate 73 and is rotated by the rotation of the hinge rod 72.

[0041] Referring to Figure 1 the hinge seat 71 includes a first mounting plate 711 and a second mounting plate 712. Among them, the second mounting plate 712 is perpendicular to the first mounting plate 711 and is fixedly connected to the center of the first mounting plate 711. A fillet is provided on the side of the second mounting plate 712 away from the first mounting plate 711, and a through hole 7121 for the hinge rod 72 to pass through is provided.

[0042] Referring to Figure 1 several reinforcing ribs 713 are also provided at the connection between the first mounting plate 711 and the second mounting plate 712. The reinforcing ribs 713 are fixedly connected to the first mounting plate 711 and the second mounting plate 712 respectively. As a preferred mode of the embodiment of the present application, the number of the reinforcing ribs 713 in this embodiment is two, and the two reinforcing ribs 713 are fixedly connected to the side of the second mounting plate 712 close to the center of the hinge rod 72. Further, in order to enhance the overall strength of the hinge seat 71, the first mounting plate 711 and the second mounting plate 712 are fixedly connected by welding in this embodiment.

[0043] Referring to Figure 1, the number of hinge seats 71 is several. In this embodiment, the number of hinge seats 71 is preferably two to improve the stability of the hinge 7 during operation. The two hinge seats 71 are placed at both ends of the hinge rod 72 and are rotatably connected to the hinge rod 72. The hinge 7 limiting device is installed on one of the hinge seats 71. In other embodiments, the number of hinge seats 71 can also be set to one to reduce the cost of manufacturing the hinge 7.

[0044] Referring to Figure 2 and Figure 3 , the limiting plate 1 is arranged in an arc shape. Fixing holes 14 for bolts to screw into are provided at both ends of the limiting plate 1. A positioning groove 12 for matching with the hinge rod 72 is provided on the outer wall of the limiting plate 1 close to the hinge rod 72. An arc groove 11 is provided on the limiting plate 1. One side of the limit pin 2 close to the limiting plate 1 extends into the arc groove 11 and slides along the arc groove 11. The depth of the arc groove 11 gradually increases along its opening direction. In another way of putting it, the bottom wall of the arc groove 11 has a slope.

[0045] Referring to Figure 2 and Figure 3 , the position where the arc groove 11 has the shallowest opening depth is the locking point 111, that is, the high end of the arc groove 11, and the position where the opening depth is the deepest is the moving point 112, that is, the low end of the arc groove 11. In this embodiment, when the limit pin 2 slides to the locking point 111, the door panel opens, and when the limit pin 2 slides to the moving point 112, the door panel closes, and at this time the hinge 7 can still move. In other embodiments, the locking point 111 and the moving point 112 can also be specifically set according to the position where the door panel needs to be limited.

[0046] Referring to Figure 2 and Figure 4 , a limit sleeve 3 is sleeved on the outer end of the limit pin 2. The limit sleeve 3 includes a fixed sleeve 31 and an adjusting sleeve 32. The fixed sleeve 31 and the adjusting sleeve 32 are sleeved together. In a specific implementation, the sleeve connection is a fixed sleeve connection. The end of the adjusting sleeve 32 away from the fixed sleeve 31 is constricted to have an annular plate 33. One end of the limit pin 2 away from the arc groove 11 passes through the annular plate 33.

[0047] Referring to Figure 2 and Figure 4 , a connecting plate 5 for connecting with the fixing plate 73 is provided at the end of the fixed sleeve 31 away from the adjusting sleeve 32. The connecting plate 5 is fixed on the fixing plate 73 by welding. A through hole 51 for the rod body 21 to pass through is provided on the connecting plate 5. One end of the rod body 21 close to the arc groove 11 passes through the through hole 51 and abuts against the bottom wall of the arc groove 11. In order to improve the smoothness of the rod body 21 sliding in the arc groove 11, one end of the rod body 21 close to the arc groove 11 is spherical.

[0048] Referring to Figure 2 andFigure 4 , an elastic member 4 in a compressed state is provided between the limit pin 2 and the limit sleeve 3. As a preferred embodiment of the present application, the elastic member 4 in this embodiment can be a spring. The two ends of the spring act on the limit pin 2 and the limit sleeve 3 respectively. The limit pin 2 includes a rod body 21 and a limit flange 22. The limit flange 22 is sleeved on the rod body 21 and connected to the rod body 21. The spring is sleeved on the rod body 21. One end of the spring abuts against the annular plate 33, and the other end of the spring abuts against the wall surface of the limit flange 22.

[0049] When the limit pin 2 slides from the moving point 112 to the locking point 111, under the action of the bottom wall of the arc-shaped groove 11 with a slope, the limit pin 2 moves away from the limit plate 1 while sliding. The limit flange 22 applies pressure to compress the spring. The closer the limit pin 2 is to the locking point 111, the greater the degree of compression of the spring. The spring applies pressure to the limit flange 22, causing the end of the rod body 21 close to the arc-shaped groove 11 to apply pressure to the bottom wall of the arc-shaped groove 11, so as to increase the friction force between the rod body 21 and the bottom wall of the arc-shaped groove 11. The difficulty for relevant personnel to slide the rod body 21 gradually increases. When the limit pin 2 slides to the locking point 111, the compression degree of the spring is the largest at this time, and the limit pin 2 is limited.

[0050] Refer to Figure 2 and Figure 4 , in other embodiments, in order to realize that the pressing force of the spring can be adjusted, the sleeving method between the fixed sleeve 31 and the adjusting sleeve 32 can be: the fixed sleeve 31 and the adjusting sleeve 32 are threadedly connected, that is, the distance between them can be adjusted by rotation. Specifically: when the adjusting sleeve 32 is rotated inward, the annular plate 33 moves closer to the limit plate 1, and the spring is compressed. When the adjusting sleeve 32 is rotated outward, the annular plate 33 moves away from the limit plate 1, and the spring expands. By adjusting the screwing depth of the adjusting sleeve 32 relative to the fixed sleeve 31, the compression amount of the spring can be changed to meet different pre-tightening force requirements; further, when the limit pin 2 is slid to the locking point 111, the adjusting sleeve 32 can be rotated to compress the spring to improve the limiting effect. During the sliding process of the limit pin 2, the adjusting sleeve 32 can also be rotated to expand the spring to reduce the difficulty of sliding the limit pin 2.

[0051] Refer to Figure 4, the outer diameter of the limiting convex edge 22 is smaller than the inner diameter of the adjusting sleeve 32 to prevent the situation where the limiting convex edge 22 abuts against the end of the adjusting sleeve 32 close to the limiting plate 1 during the compression of the spring, which makes it difficult to further adjust the spring. Further, the limiting convex edge 22 is detachably connected to the rod body 21. Specifically, the limiting convex edge 22 is threadedly connected to the rod body 21, which not only facilitates the replacement of the limiting convex edge 22 but also allows the relative position of the limiting convex edge 22 on the rod body 21 to be adjusted to further adjust the compression degree of the spring. In other embodiments, the limiting convex edge 22 can also be split into two semi-circular ring plates and fastened to the rod body 21 by bolts.

[0052] The implementation principle of Embodiment 1 of this application is as follows: One end of the limit pin 2 close to the limiting plate 1 abuts against the bottom wall of the arc-shaped groove 11, and the bottom wall of the arc-shaped groove 11 has a certain slope. During the door-opening process, the fixing plate 73 drives the limit pin 2 to slide from the moving point 112 towards the locking point 111. At this time, the limit pin 2 moves away from the limiting plate 1, and the limiting sleeve 3 is connected to the fixing plate 73, and the distance between it and the limiting plate 1 remains unchanged. At this time, the spring that abuts against the limiting convex edge 22 and the annular plate 33 at both ends gradually contracts, and the spherical end of the rod body 21 exerts pressure on the bottom wall of the arc-shaped groove 11, making the friction between the rod body 21 and the arc-shaped groove 11 gradually increase. When the limit pin 2 slides to the locking point 111, the compression degree of the spring is the largest at this time, and the limit pin 2 is limited.

[0053] Embodiment 2:

[0054] Refer to Figure 5 , the difference between this Embodiment 2 and Embodiment 1 is that a hinge 7 limiting device for a vacuum furnace door further includes an adjusting block 6. A through hole 13 matching the adjusting block 6 is provided on the bottom wall of the high end of the arc-shaped groove 11. The adjusting block 6 is threadedly connected to the inner wall of the through hole 13. The top wall of the adjusting block 6 can smoothly transition with the bottom wall of the arc-shaped groove 11. An installation hole 7122 for the adjusting block 6 to extend into is opened on the second installation plate 7122 connected to the limiting plate 1, and the installation hole 7122 is directly below the through hole 13. In other embodiments, a through hole 13 can also be continuously opened on the bottom wall of the low end of the arc-shaped groove 11, and an adjusting block 6 is threadedly connected at this through hole 13.

[0055] The implementation principle of Embodiment 2 of this application is as follows: Since the arc-shaped groove 11 has a certain slope, and the elasticity of the spring gradually fails after long-term opening and closing of the door, resulting in a poor locking effect of the limit pin 2. When the spring has not been replaced in time and there are too many people moving on the furnace door side, there may be accidental touches that push the furnace door and cause the limit pin 2 to slide from the locking point 111 towards the moving point 112.

[0056] When the limit pin 2 slides to the locking point 111, that is, on the bottom wall of the high end of the arc-shaped groove 11, at this time, insert a movable wrench from one side of the mounting hole 7122 and rotate the adjusting block 6 to move the adjusting block 6 away from the limit plate 1. At this time, the elastic element stretches, and the spherical end of the limit pin 2 falls into the through hole 13 and is limited by the peripheral side wall of the through hole 13, so as to reduce the possibility of danger due to too many people around. Relevant personnel can also rotate the adjusting block 6 to choose to lock the furnace door with friction or the peripheral side wall of the through hole 13, which has stronger versatility and higher safety.

[0057] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same parts are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A hinge limit device for the door of a vacuum furnace, comprising a limit plate (1) and a limit pin (2), characterized in that, A limiting sleeve (3) is sleeved on the outer end of the limiting pin (2). An elastic member (4) in a compressed state is arranged between the limiting pin (2) and the limiting sleeve (3). Two ends of the elastic member (4) act on the limiting pin (2) and the limiting sleeve (3) respectively. An arc-shaped groove (11) is formed in the limiting plate (1). The depth of the arc-shaped groove (11) gradually increases along the opening direction thereof. One end of the limiting pin (2) abuts against the bottom wall of the arc-shaped groove (11) and slides along the arc-shaped groove (11). The limiting sleeve (3) includes a fixed sleeve (31) and an adjusting sleeve (32). The fixed sleeve (31) and the adjusting sleeve (32) are sleeved with each other and the distance therebetween is adjustable. One end of the adjusting sleeve (32) away from the fixed sleeve (31) is shrunk to form an annular plate (33). One end of the limiting pin (2) away from the arc-shaped groove (11) penetrates through the annular plate (33). One end of the elastic member (4) abuts against the annular plate (33). The limiting pin (2) includes a rod body (21) and a limiting convex edge (22). The limiting convex edge (22) is sleeved on the rod body (21) and connected to the rod body (21). The elastic member (4) is sleeved on the rod body (21) and the other end of the elastic member (4) abuts against the wall surface of the limiting convex edge (22). One end of the limiting pin (2) close to the limiting plate (1) is spherical crown-shaped.

2. The hinge limit device for the door of a vacuum furnace according to claim 1, wherein, The outer diameter of the limiting convex edge (22) is smaller than the inner diameter of the adjusting sleeve (32).

3. The hinge limit device for the door of a vacuum furnace according to claim 1 or 2, characterized in that, The limiting convex edge (22) is detachably connected to the rod body (21).

4. The hinge limit device for the door of a vacuum furnace according to claim 1, characterized in that, The limiting plate (1) is arc-shaped. A positioning groove (12) for matching with a hinge (7) is formed in an outer wall on one side of the limiting plate (1).

5. The hinge limit device for the door of a vacuum furnace according to claim 1, characterized in that, One end of the fixed sleeve (31) away from the adjusting sleeve (32) is provided with a connecting plate (5) for connecting with the hinge (7). A through hole (51) for the limiting pin (2) to pass through is formed in the connecting plate (5).

6. The hinge limit device for the door of a vacuum furnace according to claim 1, characterized in that, An adjusting block (6) is further included. A through hole (13) matching with the adjusting block (6) is formed in the bottom wall at the high end of the arc-shaped groove (11). The adjusting block (6) is in threaded connection with the inner wall of the through hole (13).

7. A hinge, characterized in that, It includes a hinge seat (71), a hinge rod (72) and a hinge (7) limiting device according to any one of claims 1-6. The hinge rod (72) is rotatably connected to the hinge seat (71). A fixing plate (73) for connecting with a door panel is connected to the hinge rod (72). The limiting sleeve (3) is connected to the fixing plate (73). The limiting plate (1) is connected to the hinge seat (71).

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