Automatic lifting device for heat treatment furnace and lifting method thereof

Abstract

The present invention relates to the technical field of heat treatment furnaces, and specifically to an automatic lifting device for a heat treatment furnace and a lifting method thereof, comprising a machine body, a heating furnace and a lifting platform, wherein the heating furnace is installed in the machine body and is used to heat the object to be processed, and the lower end portion thereof is hollowed out; the lifting platform can lift the object to be processed through the hollowed-out portion at the lower end of the heating furnace, and be embedded in the hollowed-out portion at the lower end of the heating furnace for sealing. The present invention sets a movable blocking frame in the heating furnace, and uses the heat insulation block on the upper part of the blocking frame to block the opening in the process of opening or closing the heating furnace, thereby reducing the contact area between the internal heat and the environment outside the furnace, reducing the heat dissipation, and in the process of the support plate lifting the object to be heated, the connection strength between the support plate and the bottom of the blocking frame can be improved by end face embedding, thereby improving the sealing between the two to a certain extent, and further reducing the heat dissipation in the furnace.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment furnaces, and in particular to automatic lifting equipment for a heat treatment furnace and a lifting method thereof. Background Art

[0002] A heat treatment furnace refers to an electric furnace or fuel furnace used for heat treatment of furnace charges. Workpieces are continuously loaded from the loading door, passed through the furnace, and continuously unloaded from the discharging door. The commonly used method of conveying in the furnace is to place the workpiece on a heat-resistant steel guide rail and transfer it with a stepping moving beam or push rod. It is an indispensable equipment in modern industry.

[0003] In the prior art, during the transportation process of the heated parts, the furnace door needs to be opened to achieve the purpose of feeding. During the processing process, the reciprocating opening of the furnace door will inevitably cause a large amount of heat loss, which not only causes energy waste, but also the heat dissipation during the processing and transportation of the heated parts will cause damage to other non-heating components. Currently, most companies achieve the purpose of reducing heat dissipation by controlling the transportation speed and reducing the opening time of the warehouse door, but the effect is not high. A large amount of heat is still dissipated and lost with the opening and closing of the warehouse door.

[0004] Therefore, an automatic lifting device for a heat treatment furnace and a lifting method thereof are proposed to solve the above-mentioned problems. Summary of the invention

[0005] Technical issues solved

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic lifting device for a heat treatment furnace and a lifting method thereof, which can effectively solve the problem of excessive heat dissipation during the opening and closing process of the chamber door of the heat treatment furnace in the prior art.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides an automatic lifting device for a heat treatment furnace, comprising a machine body, a heating furnace and a lifting platform, wherein the heating furnace is installed in the machine body and is used to heat a workpiece, and the lower end of the heating furnace is hollowed out; the lifting platform can lift the workpiece to be processed through the hollowed out lower end of the heating furnace, and be embedded in the hollowed out lower end of the heating furnace for sealing;

[0010] Among them, a blocking frame which can be guided and moved along the height direction of the heating furnace is provided in the machine body, and an insulating block is provided at the upper end of the blocking frame. When the lifting platform is separated from the heating furnace, the insulating block can be embedded in the hollow part of the bottom of the heating furnace to prevent heat leakage.

[0011] Furthermore, the bottom of the blocking frame is hollowed out, and the cross-section of the blocking frame is an isosceles trapezoidal shape that is wide at the top and short at the bottom. The cross-section of the lifting platform is an isosceles trapezoidal shape that is short at the top and wide at the bottom, and is offset from the inner edge of the hollow at the bottom of the blocking frame.

[0012] Furthermore, a plurality of support bars are provided at the upper end of the lifting platform, and the plurality of support bars are distributed at intervals along one side of the lifting platform.

[0013] Furthermore, the blocking frame includes a sliding frame and a connecting plate, the sliding frame is guided to slide in the heating furnace, the insulating block is arranged at the upper part of the sliding frame, the connecting plate is arranged at the lower part of the sliding frame and is distributed parallel to the insulating block, and the hollow part is opened up and down at one end of the connecting plate facing the insulating block.

[0014] Furthermore, the upper and lower ends of the blocking frame are respectively arranged at the upper and lower positions of the hollow part of the bottom of the heating furnace, and the areas of both ends thereof are larger than the area of ​​the hollow part of the bottom of the heating furnace.

[0015] Furthermore, the inner ends of the hollowed-out portions at the lower end of the heating furnace are arc-shaped, and the outer ends of the heat-insulating blocks are arc-shaped and are arranged alternately with the inner ends of the hollowed-out portions at the lower end of the heating furnace.

[0016] Furthermore, a cavity is provided inside the thermal insulation block, and the interior of the cavity is in a vacuum state.

[0017] Furthermore, the blocking frame also includes a resistance member, and the resistance member is installed between the heating furnace and the lifting platform;

[0018] Among them, guide rods are vertically provided on both sides of the lower end of the heating furnace, and the two sides of the lifting platform are respectively sleeved on the two guide rods. The resistance member is a reset spring sleeved on the guide rods, and one end of the reset spring abuts against the upper end of the lifting platform.

[0019] A method for automatically lifting a heat treatment furnace, applied to the automatic lifting device for a heat treatment furnace described above, comprises the following steps:

[0020] Step 1: Place the object to be processed in the middle of the lifting platform and move it into the heating furnace;

[0021] Step 2: When the lifting platform is engaged with the hollowed-out portion at the bottom of the connecting plate, push the blocking frame toward the heating furnace until the object to be processed completely enters the heating area of ​​the heating furnace;

[0022] Step 3: After the workpiece is heated to high temperature, reset the lifting platform until the side of the insulation block fits tightly against the inner edge of the hollow at the bottom of the heating furnace to prevent heat leakage.

[0023] Beneficial Effects

[0024] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0025] The present invention provides a movable blocking frame in the heating furnace, and utilizes the heat insulating block on the upper part of the blocking frame to block the opening of the heating furnace during the process of opening or closing the opening of the heating furnace, thereby reducing the contact area between the internal heat and the environment outside the furnace and reducing heat dissipation. In the process of the support plate supporting the part to be heated, the connection strength between the support plate and the bottom of the blocking frame can be improved by end face engagement, thereby improving the sealing between the two to a certain extent and further reducing the heat dissipation in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic side view of the main structure in an embodiment of the present invention;

[0028] Figure 2 It is an overall schematic diagram of the main structure in an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the electric heating network in an embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the main structure decomposition in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the moving state of the blocking frame in the embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of the exploded structure of the blocking frame in an embodiment of the present invention;

[0033] Figure 7 In the embodiment of the present invention Figure 6 Schematic diagram of the structure at A in the middle;

[0034] Figure 8 Schematic diagram of the contact structure between the support plate and the connecting plate in an embodiment of the present invention.

[0035] The numbers in the figure represent: 1. machine body; 11. guide rail; 12. limit bar; 13. electric heating net; 2. heating furnace; 21. guide rod; 3. lifting platform; 31. support bar; 32. lifting mechanism; 33. support plate; 4. blocking frame; 41. insulation block; 42. sliding frame; 43. connecting plate; 44. resistance member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention will be further described below in conjunction with the embodiments.

[0038] Example: Refer to Figure 1-8 , an automatic lifting device for a heat treatment furnace, includes a body 1, a heating furnace 2 is installed in the body 1, the heating furnace 2 is rectangular in shape as a whole, an electric heating net 13 is distributed on the inner peripheral wall thereof, and a hollow is provided at the bottom of the heating furnace 2. When it is necessary to heat the object to be processed, the object to be processed is allowed to enter the heating furnace 2, and the electric heating net 13 is started to heat the object to be processed. In this example, the wiring and control of the electric heating net 13 in the heating furnace 2 are all existing technologies, and this example will not be described in detail.

[0039] A vertically liftable lifting platform 3 is provided at the lower part of the machine body 1. The lifting platform 3 can lift the object to be processed and pass it through the hollow part at the lower end of the heating furnace 2, and be embedded in the hollow part at the lower end of the heating furnace 2 for sealing. The middle part of the lifting platform 3 is used to place the object to be processed. In actual use, it can be placed next to the transmission belt, and the object to be processed can be lifted into the lifting platform 3 for heating.

[0040] A blocking frame 4 is provided in the machine body 1 and can be guided to rise and fall along the height direction of the machine body 1. When the workpiece to be processed is in a heating state, the blocking frame 4 will be pushed up with the rise of the lifting platform 3 and will always be located above the lifting platform 3. When the workpiece to be processed is heated, the position of the lifting platform 3 remains unchanged, and the blocking frame 4 will always remain in place under the support of the lifting platform 3. At this time, the bottom edge of the lifting platform 3 will be embedded in the inner edge of the hollow part of the bottom of the heating furnace 2 to achieve a certain degree of sealing.

[0041] When the object to be processed is heated and as the lifting platform 3 descends and leaves the heating furnace 2, the blocking frame 4 will move downward under the action of gravity. During the movement, the upper part of the blocking frame 4 will always fit in the hollow at the bottom of the lifting platform 3. During the downward movement of the lifting platform 3, the hollow at the bottom of the heating furnace 2 has no large-scale connection with the outside world, thereby preventing heat from flowing out from the hollow at the bottom and causing energy waste.

[0042] In this example, a certain limiting structure is provided inside the heating furnace 2 so that the blocking frame 4 will not separate from the heating furnace 2, including a guide rail 11 for guiding the sliding of the blocking frame 4 and a limiting bar 12 for limiting the blocking frame 4. This is the prior art and will not be described in detail in this example.

[0043] Specifically, the blocking frame 4 includes two parts, the upper part of which is set as an insulation block 41. A cavity is set inside the insulation block 41, and the inside of the cavity is kept in vacuum. When the outer end of the insulation block 41 abuts against the inner edge of the hollow bottom of the heating furnace 2, heat dissipation is reduced by reducing the area of ​​air communicating with the outside world. In addition, since the thermal conductivity in a vacuum state is poor, the material of the insulation block 41 can be selected from a material with poor thermal conductivity to further reduce heat dissipation.

[0044] The blocking frame 4 includes a sliding frame 42 which can be guided and slid along the height direction of the heating furnace 2, and the heat insulating block 41 is arranged on the upper part of the sliding frame 42, and the lower part of the sliding frame 42 is arranged as a rectangular connecting plate 43, and the middle part of the connecting plate 43 is provided with a rectangular hollow groove for the upper part of the lifting platform 3 to resist and lift the blocking frame 4 to rise, and the connecting plate 43 is arranged below the hollow part at the bottom of the heating furnace 2, and its length and width are greater than the length and width of the hollow part, and the heat insulating block 41 is arranged above the hollow part.

[0045] The cross-section of the connecting plate 43 is an isosceles trapezoid that is wide at the top and short at the bottom, and the cross-section of the lifting platform 3 is an isosceles trapezoid that is short at the top and wide at the bottom, and is offset from the inner edge of the hollow bottom of the connecting plate 43. When the lifting platform 3 rises, its outer edge will abut against the inner edge of the hollow bottom of the connecting plate 43, thereby pushing the entire blocking frame 4 to rise together. At this time, the insulation block 41 will rise accordingly and gradually separate from the hollow bottom of the heating furnace 2. When the connecting plate 43 is close to the bottom of the heating furnace 2, the object to be processed has passed through the hollow bottom of the heating furnace 2 to reach the heating area, and moves again until the connecting plate 43 abuts against the bottom end surface of the heating furnace 2. At this time, the heating process can be carried out.

[0046] A plurality of support bars 31 are provided at the middle of the upper end of the lifting platform 3. The plurality of support bars 31 are spaced apart along one side of the lifting platform 3. The support bars 31 are made of silicon carbide with good thermal conductivity. The spaced apart distribution increases the contact surface between the bottom of the workpiece placed on the upper end of the support bars 31 and the heat, thereby improving the heating effect on the bottom of the workpiece.

[0047] The lifting platform 3 is specifically divided into three parts, a lifting mechanism 32 for providing lifting power, a support plate 33 installed on the upper end of the lifting mechanism 32, and support bars 31 are evenly spaced and distributed in the middle of the upper end of the support plate 33, and the support plate 33 as a whole has an isosceles trapezoidal structure with a short upper part and a wide lower part in cross section. The support plate 33 can be embedded in the hollow groove at the bottom of the connecting plate 43.

[0048] The outer end of the insulation block 41 is arc-shaped and interlaced with the inner edge of the hollow part at the lower end of the heating furnace 2. During the downward movement of the insulation block 41, the connection with the hollow part at the lower end of the heating furnace 2 will gradually become tight to prevent heat leakage. The upper end of the insulation block 41 is the same size as the connecting plate 43, providing a certain limiting effect.

[0049] Two groups of guide rails are inserted at the lower end of the connecting plate 43, each group of guide rails is composed of three guide rods 21 arranged at intervals, and the two groups of guide rails are symmetrically distributed, and the lifting platform 3 is guided and slid on the two groups of guide rails, and a resistance member 44 is sleeved on each guide rod 21, and the resistance member 44 is a return spring sleeved on the guide rod 21, and one end of the return spring abuts against the upper end of the lifting platform 3. When the connecting plate 43 abuts against the lower end of the heating furnace 2, the lifting platform 3 continues to rise, which not only makes the connection between the lifting platform 3 and the connecting plate 43 tighter and reduces the heat loss between the two, but also allows the height of the lifting platform 3 to move a certain distance into the heating furnace 2 again.

[0050] A method for automatically lifting a heat treatment furnace, applied to the above-mentioned automatic lifting device for a heat treatment furnace, comprises the following steps:

[0051] Step 1: Place the object to be processed in the middle of the lifting platform 3 and move it into the heating furnace 2;

[0052] Step 2: When the lifting platform 3 is engaged with the hollowed-out portion at the bottom of the connecting plate 43, the blocking frame 4 is pushed to move toward the heating furnace 2 until the object to be processed completely enters the heating area of ​​the heating furnace 2;

[0053] Step 3: After the workpiece is heated at high temperature, the lifting platform 3 is reset until the side end of the heat insulation block 41 is tightly attached to the inner edge of the hollow part of the bottom of the heating furnace 2 to prevent heat leakage.

[0054] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic lifting device for a heat treatment furnace, characterized in that: include: Body; A heating furnace, which is installed in the machine body and is used to heat the object to be processed, and the lower end of the heating furnace is hollowed out; A lifting platform, which can lift the object to be processed through the hollow portion at the lower end of the heating furnace and be embedded in the hollow portion at the lower end of the heating furnace for sealing; Wherein, a blocking frame which can be guided and moved along the height direction of the heating furnace is provided in the machine body, and a heat insulation block is provided at the upper end of the blocking frame. When the lifting platform is separated from the heating furnace, the heat insulation block can be embedded in the hollow part of the bottom of the heating furnace to prevent heat leakage; The bottom of the blocking frame is hollowed out, and the cross section of the blocking frame is an isosceles trapezoidal shape that is wide at the top and short at the bottom. The cross section of the lifting platform is an isosceles trapezoidal shape that is short at the top and wide at the bottom, and is staggered with the inner edge of the hollow at the bottom of the blocking frame; The blocking frame includes: A sliding frame, wherein the sliding frame is guided to slide in the heating furnace, and the heat insulating block is arranged on the upper part of the sliding frame; The connecting plate is arranged at the lower part of the sliding frame and is distributed parallel to the heat insulation block. The hollow part is penetrated up and down and is opened at one end of the connecting plate facing the heat insulation block.

2. The automatic lifting equipment for a heat treatment furnace according to claim 1 is characterized in that: The upper end of the lifting platform is provided with a plurality of supporting bars, and the plurality of supporting bars are distributed at intervals along one side of the lifting platform.

3. The automatic lifting equipment for a heat treatment furnace according to claim 1, characterized in that: The upper and lower ends of the blocking frame are respectively arranged at the upper and lower positions of the hollowed-out part of the bottom of the heating furnace, and the areas of both ends thereof are larger than the area of ​​the hollowed-out part of the bottom of the heating furnace.

4. The automatic lifting equipment for a heat treatment furnace according to claim 1, characterized in that: The inner ends of the hollowed-out parts at the lower end of the heating furnace are all in arc shape, and the outer ends of the heat insulation blocks are in arc surface and are arranged alternately with the inner ends of the hollowed-out parts at the lower end of the heating furnace.

5. The automatic lifting device for a heat treatment furnace according to claim 1, characterized in that: A cavity is provided inside the heat insulation block, and the interior of the cavity is in a vacuum state.

6. The automatic lifting device for a heat treatment furnace according to claim 1, characterized in that: The blocking frame also includes: A resistance member installed between the heating furnace and the lifting platform; Among them, guide rods are vertically provided on both sides of the lower end of the heating furnace, and the two sides of the lifting platform are respectively sleeved on the two guide rods. The resistance member is a reset spring sleeved on the guide rods, and one end of the reset spring abuts against the upper end of the lifting platform.

7. A method for automatically lifting a heat treatment furnace, applied to an automatic lifting device for a heat treatment furnace as described in any one of claims 1 to 6, characterized in that: The steps include: Step 1: Place the object to be processed in the middle of the lifting platform and move it into the heating furnace; Step 2: When the lifting platform is engaged with the hollowed-out portion at the bottom of the connecting plate, push the blocking frame toward the heating furnace until the object to be processed completely enters the heating area of ​​the heating furnace; Step 3: After the workpiece is heated to high temperature, reset the lifting platform until the side of the insulation block fits tightly against the inner edge of the hollow at the bottom of the heating furnace to prevent heat leakage.

Images