Furnace door lifting device of well type tempering furnace

Abstract

The furnace door lifting device comprises a furnace body, a furnace door and a lifting mechanism, the furnace door is arranged at the top of the furnace body, and the top of the furnace door is connected with the lifting mechanism. The lifting mechanism comprises a first motor, a first transmission shaft, a straight gear, a rack and a rack positioning shell. The output end of the first motor is connected with one end of the first transmission shaft, the straight gear is arranged on the first transmission shaft, one side of the rack positioning shell in the length direction is connected with the furnace body, the rack is arranged in the rack positioning shell and is in meshed connection with the straight gear, and a plurality of protruding blocks are arranged on the two sides of the rack in the vertical direction at equal intervals. Sliding rails matched with the protruding blocks are arranged on the two sides in the rack positioning shell, the protruding blocks are embedded in the sliding rails in a sliding mode, and the height of the rack is larger than that of the rack positioning shell. A rotating unit is further arranged at the top of the rack and connected with the rack and the furnace door. Safe and efficient lifting of the furnace door of the well type tempering furnace is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of heating furnaces, and in particular to a lifting device for a furnace door of a pit-type tempering furnace. Background Art

[0002] Pit-type tempering furnaces are widely used as special tempering equipment for mechanical parts. They can change the surface composition of metal materials, thereby improving the quality of workpieces. They are widely used in smelting, forging, manufacturing, heat treatment, drying and other industries. Common tempering furnaces on the market include a furnace body and a furnace door. When in use, first open the furnace door and then put the parts to be tempered into the furnace body. After putting the parts, close the furnace door and operate the external control switch to heat the furnace body. After the set time, the tempering is completed.

[0003] In actual production operations of the pit-type tempering furnace of the prior art, the furnace door and the furnace body of the tempering furnace are connected by hinged flipping. In this way, when opening the furnace door, the operator needs to stand near the furnace body and manually crank the sprocket to realize the lifting and lowering of the furnace door. This manual method of opening the furnace door requires at least two people to operate, which not only has high operation intensity and low work efficiency, but also poses a safety hazard. Utility Model Content

[0004] The present application provides a pit-type tempering furnace door lifting device to solve the above-mentioned problems mentioned in the background technology.

[0005] The present application provides a furnace door lifting device for a pit-type tempering furnace, comprising: a furnace body, a furnace door and a lifting mechanism, wherein the furnace door is arranged at the top of the furnace body, and the top of the furnace door is connected to the lifting mechanism.

[0006] The lifting mechanism includes a first motor, a first transmission shaft, a spur gear, a rack and a rack positioning housing. The output end of the first motor is connected to one end of the first transmission shaft, the spur gear is arranged on the first transmission shaft, one side of the rack positioning housing in the length direction is connected to the furnace body, the rack is arranged in the rack positioning housing, the rack is meshed with the spur gear, a plurality of protrusions are arranged at equal distances on both sides of the rack in the vertical direction, slide rails adapted to the protrusions are arranged on both sides of the rack positioning housing, the protrusions are slidably embedded in the slide rails, and the height of the rack is higher than the height of the rack positioning housing.

[0007] A rotating unit is also provided on the top of the rack, and the rotating unit is connected to the rack and the furnace door respectively.

[0008] Optionally, the rotating unit includes a second motor, a second transmission shaft, a driving gear, a driven gear and an inverted U-shaped rod.

[0009] The output end of the second motor is connected to one end of the second transmission shaft, the second transmission shaft is arranged in a vertical direction, and the driving gear fixing sleeve is placed on the second transmission shaft. One end of the inverted U-shaped rod is connected to the top of the rack through a bearing, and the other end of the inverted U-shaped rod is fixedly connected to the furnace door. A driven gear is provided on the outer fixed sleeve of one end of the inverted U-shaped rod close to the rack, and the driving gear is meshed and connected with the driven gear.

[0010] Optionally, a first support platform is fixedly provided at the lower part of the furnace body, a second support platform is fixedly provided on one side of the portion of the rack higher than the rack positioning shell, the first motor is located on the first support platform, and the second motor is located on the second support platform.

[0011] Optionally, an angle sensor is provided at the connection between the inverted U-shaped rod and the rack.

[0012] Optionally, the lifting device of the furnace door of the pit-type tempering furnace has a distance measuring device, and the distance measuring device includes an infrared distance measuring device and a distance measuring block.

[0013] The infrared rangefinder is arranged on the outer side wall of the upper part of the furnace body, the distance measuring block is arranged on the edge of the furnace door and vertically aligned with the infrared rangefinder, and the infrared ray emission point of the infrared rangefinder is arranged opposite to the distance measuring block.

[0014] Optionally, at least three distance measuring devices are arranged about the central axis of the furnace body.

[0015] Optionally, the lifting device for the door of the pit-type tempering furnace is also connected to a controller, and the controller is electrically connected to the first motor, the second motor, the angle sensor and the infrared rangefinder respectively.

[0016] The pit-type tempering furnace door lifting device provided in the present application realizes the safe and efficient lifting of the pit-type tempering furnace door, and has the following beneficial effects compared with the prior art:

[0017] (1) By setting up a lifting mechanism, including a first motor, a first transmission shaft, a spur gear, a rack and a rack positioning shell. The first motor is used to provide power to drive the first transmission shaft to rotate, and the first transmission shaft drives the spur gear to rotate. The rack is meshed with the spur gear to convert the rotation of the spur gear into the reciprocating linear motion of the rack, so as to realize the opening and closing of the furnace door. By meshing the spur gear and the rack, the rotation of the spur gear is converted into the reciprocating linear motion of the rack, which will realize the rising and falling of the furnace door. In this way, when the pit-type tempering furnace is used, the labor input is reduced, making the lifting of the furnace door safer and more efficient. By setting up a rotating unit, the furnace door is driven to rotate in the horizontal plane, so that the furnace door deviates from the top of the furnace body, which is convenient for putting the parts to be tempered into or taking them out of the furnace body, further improving the safety and convenience of using the pit-type tempering furnace.

[0018] (2) By setting a rotating unit, the furnace door is driven to rotate in the horizontal plane after it rises, so as to improve the convenience of operation of the pit-type tempering furnace when tempering metal parts. By turning on the second motor to provide driving force, the second transmission shaft is driven to rotate, and the second transmission shaft drives the driving gear to rotate. The driving gear is meshed with the driven gear. The rotation of the driving gear drives the driven gear to rotate. The driven gear drives the inverted U-shaped rod to rotate, and then the inverted U-shaped rod drives the furnace door to rotate, so that the furnace door deviates from the top of the furnace body 1, which is convenient for placing or taking metal parts. This arrangement avoids the complicated operation of manually rotating the furnace door and the labor output of personnel, and improves the convenience, safety and efficiency of the pit-type tempering furnace.

[0019] (3) By setting an angle sensor, when the furnace door is rotated by the rotating structure, the second motor can be turned off after the furnace door is rotated to an appropriate angle, without the need for manual real-time observation of the furnace door's deviation from the position directly above the furnace body, thereby improving the convenience of using the rotating unit and making the operation of lifting and lowering the furnace door by the lifting mechanism more efficient. A distance measuring device is also provided, which can not only be used to open and close the furnace door, but also detect whether the furnace door is tilted, further improving the safety of the furnace door. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a lifting device for a pit-type tempering furnace door provided in one embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of the connection between the rack positioning housing and the furnace body provided in one embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a lifting device for a pit-type tempering furnace door provided in another embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of a lifting device for a pit-type tempering furnace door provided in yet another embodiment of the present application;

[0025] Description of reference numerals:

[0026] 1: furnace body, 2: furnace door, 7: controller, 110: first support platform, 120: second support platform, 310: first motor, 320: first transmission shaft, 330: spur gear, 340: rack, 341: bump, 350: rack positioning shell, 351: slide rail, 410: second motor, 420: second transmission shaft, 430: driving gear, 440: driven gear, 450: inverted U-shaped rod, 510: angle sensor, 610: infrared rangefinder, 620: ranging block. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0028] like Figure 1 , Figure 2 As shown, the present application provides a furnace door lifting device for a pit-type tempering furnace, comprising: a furnace body 1, a furnace door 2 and a lifting mechanism, wherein the furnace door 2 is arranged at the top of the furnace body 1, and the top of the furnace door 2 is connected to the lifting mechanism.

[0029] The lifting mechanism includes a first motor 310, a first transmission shaft 320, a spur gear 330, a rack 340 and a rack positioning housing 350. The output end of the first motor 310 is connected to one end of the first transmission shaft 320, the spur gear 330 is arranged on the first transmission shaft 320, one side of the rack positioning housing 350 in the length direction is connected to the furnace body 1, the rack 340 is arranged in the rack positioning housing 350, the rack 340 is meshed and connected with the spur gear 330, a plurality of protrusions 341 are arranged at equal distances on both sides of the rack 340 in the vertical direction, and slide rails 351 adapted to the protrusions 341 are arranged on both sides of the rack positioning housing 350, the protrusions 341 are slidably embedded in the slide rails 351, and the height of the rack 340 is higher than the height of the rack positioning housing 350.

[0030] A rotating unit is also provided on the top of the rack 340, and the rotating unit is connected to the rack 340 and the furnace door 2 respectively.

[0031] Specifically, when the pit-type tempering furnace is used, the furnace door 2 is first opened, and then the parts to be tempered are placed in the furnace body 1, and then the furnace door 2 is closed to perform the tempering operation on the parts. When the furnace door 2 is opened, it is realized by the lifting mechanism. The lifting mechanism includes a first motor 310, a first transmission shaft 320, a spur gear 330, a rack 340 and a rack positioning shell 350. The first motor 310 is used to provide power to drive the first transmission shaft 320 to rotate, and the first transmission shaft 320 drives the spur gear 330 to rotate. The rack 340 is meshed and connected with the spur gear 330, and the rotation of the spur gear 330 is converted into the reciprocating linear motion of the rack 340. A rotating unit is also provided at the top of the rack 340, and the rotating unit is respectively connected to the rack 340 and the furnace door 2. The rack 340 reciprocates up and down, driving the rotating unit to move up and down, and then the rotating unit drives the furnace door 2 to move up and down, so as to realize the lifting and opening and closing of the furnace door. The first motor 310 is a forward and reverse motor. When the furnace door 2 needs to be opened, the first motor 310 is turned on to rotate forward, driving the rack 340 to move upward, so that the furnace door 2 rises. When the parts are placed in the furnace body 1, the furnace door 2 needs to be closed, and the first motor 310 is reversed to drive the rack 340 to move downward, thereby lowering the furnace door 2 and closing the furnace door 2, thereby realizing the opening and closing of the furnace door 2. Through the meshing connection between the spur gear 330 and the rack 340, the rotation of the spur gear 330 is converted into the reciprocating linear motion of the rack 340, which will realize the rising and falling of the furnace door 2. In this way, when the pit-type tempering furnace is used, the labor input is reduced, making the lifting and lowering of the furnace door 2 safer and more efficient.

[0032] The rotating unit is used to open the rotating unit after the furnace door 2 rises to a specified height, driving the furnace door 2 to rotate in the horizontal plane, so that the furnace door 2 deviates from the top of the furnace body 1, making it convenient to put the parts to be tempered into or take them out of the furnace body 1, further improving the safety and convenience of the use of the pit-type tempering furnace.

[0033] Among them, one side of the rack positioning shell 350 in the length direction is connected to the furnace body 1, and the rack 340 is arranged in the rack positioning shell 350. The rack positioning shell 350 and the rack 340 are both arranged in the vertical direction. The rack positioning shell 350 plays a positioning role in the up and down reciprocating motion of the rack 340, so that the rack 340 can only move in the vertical direction, avoiding the deviation of the rack 340, and also ensuring that the furnace door 2 can rise and fall in a straight line. A plurality of protrusions 341 are arranged at equal distances on both sides of the rack 340 in the vertical direction, and slide rails 351 adapted to the protrusions 341 are arranged on both sides of the rack positioning shell 350, and the protrusions 341 are slidably embedded in the slide rails 351. When the rack 340 reciprocates up and down, the protrusions 341 on both sides of the rack 340 are slidably embedded in the slide rails 351, so that the rack 340 moves in the vertical direction along the slide rails 351, thereby improving the stability of the movement of the rack 340, preventing the furnace door from deviating due to its own gravity or shaking, thereby making the furnace door 2 rise and fall in the vertical direction, and further improving the stability of the lifting and lowering of the furnace door 2.

[0034] When the furnace door 2 is closed, the height of the rack 340 is higher than the height of the rack positioning housing 350, which facilitates the rotation of the rotating unit on the top of the rack 340, so that the lifting mechanism and the rotating unit can operate independently.

[0035] The present application realizes the safe and efficient lifting and lowering of the furnace door of the pit-type tempering furnace through the above scheme. The lifting mechanism is provided, including a first motor, a first transmission shaft, a spur gear, a rack and a rack positioning shell. The first motor is used to provide power to drive the first transmission shaft to rotate, and the first transmission shaft drives the spur gear to rotate. The rack is meshed with the spur gear to convert the rotation of the spur gear into the reciprocating linear motion of the rack to realize the opening and closing of the furnace door. Through the meshing connection between the spur gear and the rack, the rotation of the spur gear is converted into the reciprocating linear motion of the rack to realize the rising and falling of the furnace door. In this way, when the pit-type tempering furnace is used, the labor input is reduced, making the lifting and lowering of the furnace door safer and more efficient. By providing a rotating unit, the furnace door is driven to rotate in the horizontal plane, so that the furnace door deviates from the top of the furnace body, which is convenient for putting the parts to be tempered into or taking them out of the furnace body, further improving the safety and convenience of the use of the pit-type tempering furnace.

[0036] like Figure 1 and Figure 3 As shown, optionally, the rotating unit includes a second motor 410 , a second transmission shaft 420 , a driving gear 430 , a driven gear 440 and an inverted U-shaped rod 450 .

[0037] The output end of the second motor 410 is connected to one end of the second transmission shaft 420, and the second transmission shaft 420 is arranged in a vertical direction. The driving gear 430 is fixedly sleeved on the second transmission shaft 420. One end of the inverted U-shaped rod 450 is connected to the top of the rack 340 through a bearing, and the other end of the inverted U-shaped rod 450 is fixedly connected to the furnace door 2. A driven gear 440 is fixedly sleeved on the outer side of one end of the inverted U-shaped rod 450 close to the rack 340, and the driving gear 430 is meshed and connected with the driven gear 440.

[0038] Specifically, the rotating unit is used to drive the furnace door 2 to rotate around the rack 340 in the horizontal plane after the furnace door 2 rises, so that the furnace door 2 deviates from the top of the furnace body 1, which is convenient for placing the parts to be tempered into the furnace body 1, or after the tempered parts are placed, before the furnace door 2 is lowered, the furnace door 2 is rotated back to the top of the furnace body 1 by the rotating unit, so as to improve the operating convenience of the pit-type tempering furnace when tempering metal parts.

[0039] By turning on the second motor 410 to provide driving force, the second transmission shaft 420 is driven to rotate, the second transmission shaft 420 drives the driving gear 430 to rotate, the driving gear 430 is meshed and connected with the driven gear 440, the rotation of the driving gear 430 drives the driven gear 440 to rotate, the driven gear 440 drives the inverted U-shaped rod 450 to rotate, and then the inverted U-shaped rod 450 drives the furnace door 2 to rotate, so that the furnace door 2 deviates from the top of the furnace body 1, which is convenient for placing or taking metal parts. This arrangement avoids the complicated operation of manually rotating the furnace door 2 and the labor output of personnel, and improves the convenience, safety and efficiency of the pit-type tempering furnace.

[0040] like Figure 3 As shown, optionally, a first support platform 110 is fixedly provided at the lower portion of the furnace body 1, a second support platform 120 is fixedly provided on one side of the portion of the rack 340 that is higher than the rack positioning shell 350, the first motor 310 is located on the first support platform 110, and the second motor 410 is located on the second support platform 120.

[0041] Specifically, the first support platform 110 is provided on the furnace body 1, and is used to support the first motor 310, thereby improving the stability of the first motor 310, and further improving the stability of the furnace door 2 when it is raised or lowered. The second support platform 120 is used to support the second motor 410, thereby improving the stability of the furnace door 2 when it is rotated. The second support platform 120 is connected to the upper part of the rack 340, and can be raised or lowered along with the rack 340 when the rack 340 is raised or lowered, and does not collide with the rack positioning housing 350, thereby further improving the stability of the furnace door 2.

[0042] The first support platform 110 is arranged on the furnace body 1, and the second support platform 120 is connected to the upper part of the rack 340. The first motor 310 and the second motor 410 are not fixed with the help of other equipment outside the furnace body 1. This arrangement integrates the lifting structure and the rotating structure of the furnace body 1 and the furnace door 2 into one, which is not only convenient for operation, but also convenient for transportation, further improving the convenience of the pit-type tempering furnace.

[0043] like Figure 4 As shown, optionally, an angle sensor 510 is provided at the connection between the inverted U-shaped rod 450 and the rack 340 .

[0044] Specifically, the angle sensor 510 can detect the degree of rotation of the inverted U-shaped rod 450 in real time, so that when the furnace door 2 is rotated by the rotating structure, the second motor 410 can be turned off after rotating to an appropriate angle. There is no need to manually observe in real time whether the furnace door 2 deviates from the position directly above the furnace body 1, which improves the convenience of using the rotating unit, thereby making the lifting and lowering of the furnace door 2 by the lifting mechanism more efficient.

[0045] Optionally, the lifting device of the door of the pit-type tempering furnace has a distance measuring device, and the distance measuring device includes an infrared distance meter 610 and a distance measuring block 620.

[0046] The infrared rangefinder 610 is arranged on the outer side wall of the upper part of the furnace body 1 , the distance measuring block 620 is arranged on the edge of the furnace door 2 vertically aligned with the infrared rangefinder 610 , and the infrared emission point of the infrared rangefinder 610 is arranged opposite to the distance measuring block 620 .

[0047] Specifically, the infrared emitting point of the infrared rangefinder 610 emits infrared light and reflects it on the distance measuring block 620. The infrared rangefinder 610 can calculate the distance based on the time from the emission to the reception of the infrared light and the propagation speed of the infrared light. The distance between the infrared rangefinder 610 and the distance measuring block 620 can be used to determine whether the furnace door 2 is closed, without the need for manual observation, thereby improving the efficiency of lifting and lowering the furnace door 2.

[0048] Optionally, at least three distance measuring devices are arranged about the central axis of the furnace body 1 .

[0049] Specifically, the distance measuring device can not only be used to open and close the furnace door 2, but also can detect whether the furnace door 2 is tilted. If the numerical difference between the three distance measuring devices is less than or equal to the preset difference, the furnace door 2 is normal and has not tilted. If the numerical difference between the three distance measuring devices is greater than the preset difference, the furnace door 2 is tilted relative to the horizontal plane, which means that the connection between the furnace door 2 and the inverted U-shaped rod 450 is loose, and the furnace door 2 needs to be checked, which further improves the safety of the furnace door 2.

[0050] Optionally, the lifting device for the door of the pit-type tempering furnace is also connected to a controller 7, and the controller 7 is electrically connected to the first motor 310, the second motor 410, the angle sensor 510 and the infrared rangefinder 610 respectively.

[0051] Specifically, the angle sensor 510 transmits the detected rotation angle value to the controller 7 in real time, and the infrared rangefinder 610 also transmits the detected distance value to the controller 7 in real time. When the furnace door is raised or lowered, the controller 7 can control the forward and reverse rotation and opening and closing of the first motor 310 according to the distance signal received from the infrared rangefinder 610. When the furnace door needs to be rotated, the controller 7 can control the forward and reverse rotation and opening and closing of the second motor 410 according to the angle signal received from the angle sensor 510. The degree of automation when the furnace door 2 is raised or lowered is improved.

[0052] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0053] The operation flow of the lifting device for the door of the pit-type tempering furnace in this embodiment during specific operation is as follows:

[0054] When the pit-type tempering furnace is used, the furnace door 2 is first opened, and then the parts to be tempered are placed into the furnace body 1, and then the furnace door 2 is closed to perform the tempering operation on the parts.

[0055] Furnace door rises: When the furnace door 2 needs to be opened, the controller 7 starts the first motor 310 to rotate forward, driving the first transmission shaft 320 to rotate, and the first transmission shaft 320 drives the spur gear 330 to rotate, so that the spur gear 330 drives the rack 340 meshing with it to move upward, and the top of the rack 340 is connected to the furnace door 2 through the rotating unit, and then the rise of the rack 340 drives the rotating unit to rise, and then drives the furnace door 2 to rise. During the rise of the furnace door 2, the infrared rangefinder 610 transmits the detected distance value to the controller 7 in real time. When the minimum value of the distance signal received by the controller 7 from the infrared rangefinder 610 is equal to the first preset distance value, the controller 7 turns off the first motor 310, and the furnace door 2 rises to the preset height.

[0056] Rotation of the furnace door: the controller 7 turns on the second motor 410 to rotate forward, driving the second transmission shaft 420 to rotate, the second transmission shaft 420 drives the driving gear 430 to rotate, the rotation of the driving gear 430 drives the driven gear 440 to rotate, the driven gear 440 drives the inverted U-shaped rod 450 to rotate, and then the inverted U-shaped rod 450 drives the furnace door 2 to rotate, so that the furnace door 2 deviates from the top of the furnace body 1, and the angle sensor 510 transmits the detected rotation angle value of the inverted U-shaped rod 450 to the controller 7 in real time. When the angle signal received by the controller 7 from the angle sensor 510 is equal to the first preset angle value, the controller 7 turns off the second motor 410. At this time, the furnace door 2 rotates to the preset angle deviating from the top of the furnace body 1.

[0057] The first preset distance and the first preset angle are distance and angle values ​​that enable the to-be-tempered part to be placed / taken.

[0058] Placing the parts to be tempered: Place the parts to be tempered in the furnace body 1, then rotate the furnace door 2 to the top of the furnace body 1, and then lower the furnace door 2 onto the furnace body 1 to close the furnace door 2. The operation is opposite to the raising and rotating of the furnace door 2.

[0059] Closing the furnace door: The controller 7 turns on the second motor 410 to reverse, thereby driving the inverted U-shaped rod 450 to rotate, and driving the furnace door 2 to reverse, that is, the furnace door 2 rotates to the top of the furnace body 1. When the angle signal received by the controller 7 from the angle sensor 510 is equal to the second preset angle value, the controller 7 turns off the second motor 410. At this time, the furnace door 2 rotates to the top of the furnace body 1. Then, the controller 7 turns on the first motor 310 to reverse, driving the first transmission shaft 320 to rotate, so that the spur gear 330 drives the rack 340 meshing with it to move downward, thereby driving the furnace door 2 to descend. When the minimum value of the distance signal received by the controller 7 from the infrared rangefinder 610 is equal to the second preset distance value, the controller 7 turns off the first motor 310, and the furnace door 2 descends to the furnace body 1 and closes. The lifting and lowering of the furnace door of the pit tempering furnace is completed. The first preset distance value is greater than the second preset distance value, the first preset angle value is greater than the second preset angle value, and the second preset distance value and the second preset angle value are the distance value and angle value that can close the furnace door 2.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lifting device for the door of a pit-type tempering furnace, It is characterized in that include: A furnace body (1), a furnace door (2) and a lifting mechanism, wherein the furnace door (2) is arranged at the top of the furnace body (1), and the top of the furnace door (2) is connected to the lifting mechanism; The lifting mechanism comprises a first motor (310), a first transmission shaft (320), a spur gear (330), a rack (340) and a rack positioning housing (350); an output end of the first motor (310) is connected to one end of the first transmission shaft (320), the spur gear (330) is arranged on the first transmission shaft (320), one side of the rack positioning housing (350) in the length direction is connected to the furnace body (1), and the rack (340) is arranged on the rack. The rack (340) is meshed with the spur gear (330) in a rack positioning housing (350), a plurality of protrusions (341) are arranged at equal distances on both sides of the rack (340) in a vertical direction, and slide rails (351) adapted to the protrusions (341) are arranged on both sides of the rack positioning housing (350), the protrusions (341) are slidably embedded in the slide rails (351), and the height of the rack (340) is higher than the height of the rack positioning housing (350); A rotating unit is also provided on the top of the rack (340), and the rotating unit is respectively connected to the rack (340) and the furnace door (2).

2. The lifting device for the door of a pit-type tempering furnace according to claim 1, It is characterized in that The rotating unit comprises a second motor (410), a second transmission shaft (420), a driving gear (430), a driven gear (440) and an inverted U-shaped rod (450); The output end of the second motor (410) is connected to one end of the second transmission shaft (420); the second transmission shaft (420) is arranged in a vertical direction; the driving gear (430) is fixedly sleeved on the second transmission shaft (420); one end of the inverted U-shaped rod (450) is connected to the top of the rack (340) via a bearing; the other end of the inverted U-shaped rod (450) is fixedly connected to the furnace door (2); the driven gear (440) is fixedly sleeved on the outer side of one end of the inverted U-shaped rod (450) close to the rack (340); and the driving gear (430) is meshingly connected with the driven gear (440).

3. The lifting device for the door of a pit-type tempering furnace according to claim 2, It is characterized in that A first support platform (110) is fixedly provided at the lower part of the furnace body (1), a second support platform (120) is fixedly provided on one side of the portion of the rack (340) that is higher than the rack positioning shell (350), the first motor (310) is located on the first support platform (110), and the second motor (410) is located on the second support platform (120).

4. The lifting device for the door of a pit-type tempering furnace according to claim 3, It is characterized in that An angle sensor (510) is provided at the connection between the inverted U-shaped rod (450) and the rack (340).

5. The lifting device for the door of a pit-type tempering furnace according to claim 4, It is characterized in that The pit-type tempering furnace door lifting device has a distance measuring device, and the distance measuring device includes an infrared distance meter (610) and a distance measuring block (620); The infrared rangefinder (610) is arranged on the outer side wall of the upper part of the furnace body (1), the distance measuring block (620) is arranged on the edge of the furnace door (2) and is vertically aligned with the infrared rangefinder (610), and the infrared emission point of the infrared rangefinder (610) is arranged opposite to the distance measuring block (620).

6. The lifting device for the door of a pit-type tempering furnace according to claim 5, It is characterized in that At least three distance measuring devices are arranged about the central axis of the furnace body (1).

7. The lifting device for the door of a pit-type tempering furnace according to claim 6, It is characterized in that The pit-type tempering furnace door lifting device is also connected to a controller (7), and the controller (7) is electrically connected to the first motor (310), the second motor (410), the angle sensor (510) and the infrared rangefinder (610) respectively.

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