Charging tray for box-type resistance heating furnace

Abstract

The invention belongs to the field of heat treatment equipment, and particularly relates to a charging tray for a box-type resistance heating furnace, the charging tray comprises two first bearing plates and two second bearing plates, the first bearing plates and the second bearing plates are the same in length, width and height, and the first bearing plates and the second bearing plates are provided with *-shaped grids and connecting assemblies. The two first bearing plates and the two second bearing plates are sequentially connected and fixed through the connecting assembly, the upper supporting plate and the lower supporting plate are connected in a clamped mode, and the upper supporting plate and the lower supporting plate are provided with grids shaped like a Chinese character'mi '. The tray is modularized and is divided into a plurality of parts during transportation, so that the tray can be loaded conveniently, loading can be completed without a crane, the transportation cost of the tray is reduced, the heating efficiency of a workpiece is improved, and the service life of the tray is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of heat treatment equipment, and in particular relates to a furnace loading tray for a box-type resistance heating furnace. Background Art

[0002] Heat treatment is an important metal processing technology. In the manufacturing industry, heat treatment has a wide range of applications and important influences. Through heat treatment, the strength, hardness and wear resistance of materials can be improved, and the electrical conductivity, thermal stability and corrosion resistance of materials can be improved. At the same time, heat treatment can also change the appearance of metals, making their surfaces smooth and increasing corrosion resistance. The box-type resistance heating furnace loading tray is a vital part of the heat treatment process. During the heat treatment process, it not only plays the role of carrying the workpiece and transferring heat, but also has a direct impact on the heat treatment quality of the liquid quenching workpiece cooling.

[0003] For some large and heavy castings, the size and weight of the furnace loading tray are also large. The existing large casting furnace loading trays have the following shortcomings:

[0004] 1. Existing super-large casting furnace loading pallets are all cast in one piece. Due to the large size and weight of the pallets, it is difficult to move the pallets. When transporting the pallets, a crane is needed to lift the pallets onto the transport vehicle, which occupies crane resources and increases transportation costs.

[0005] 2. When the existing super-large casting loading pallet is subjected to liquid quenching and cooling of the workpiece, the pallet is lifted into the quenching pool by a crane. During the lifting, the casting is usually in an overweight state, and the pressure of the casting on the pallet is much greater than its own gravity, which causes the casting to squeeze and deform the pallet, reducing the service life of the device.

[0006] 3. After the workpiece is liquid quenched and cooled, the pallet needs to be cleaned and dried. Due to the large size and weight of the pallet, it is not easy to turn over, which makes the bottom of the pallet difficult to clean and dry, affecting work efficiency. Summary of the invention

[0007] The object of the present invention is to provide a furnace tray for a box-type resistance heating furnace in view of the problems raised in the above background technology.

[0008] To achieve the above object, the present invention adopts the following technical solutions: a furnace tray for a box-type resistance heating furnace, comprising:

[0009] Two first load plates and two second load plates, wherein the first load plates and the second load plates are the same in length, width and height, and each of the first load plates and the second load plates is provided with a "M"-shaped grid;

[0010] A connecting assembly, wherein the connecting assembly connects and fixes the two first supporting plates and the two second supporting plates in sequence;

[0011] An upper support plate and a lower support plate are clamped together, and a "M"-shaped grid is arranged on the upper support plate and the lower support plate.

[0012] Furthermore, an arc groove is formed on one side of the first bearing plate along the length direction, and an arc groove is formed on both sides of the second bearing plate along the length direction. A hollow column is fixed in the arc groove, and the length of the hollow column is equal to half the length of the first bearing plate. The hollow column passes through the lower support plate.

[0013] Further, the connection component comprises:

[0014] Connecting shaft;

[0015] A fixing sleeve, wherein at least four first inner support rods are provided on the fixing sleeve;

[0016] A movable sleeve, wherein the movable sleeve is provided with second inner support rods having the same number as the first inner support rods;

[0017] The elastic member is located between the first inner support rod and the second inner support rod. When the movable sleeve moves toward the first inner support rod, the first inner support rod and the second inner support rod are opened into an umbrella shape under the action of the elastic member.

[0018] Furthermore, the elastic member includes a first connecting rod and a second connecting rod, the second connecting rod is provided with a cavity, a spring is provided in the cavity, and the first connecting rod is inserted into the cavity.

[0019] Furthermore, one end of the connecting shaft is provided with an external thread, the end of the external thread is provided with a fixing nut, the external thread is provided with a locking nut, the locking nut is fixed with an extrusion ring, and the extrusion ring is in contact with the movable sleeve.

[0020] Furthermore, one end of the hollow column is detachably and rotatably connected to a lifting ear, and a limiting groove is provided on a side wall surrounding the lifting ear.

[0021] Furthermore, the lower supporting plate is threadedly connected with a screw, and the screw abuts against the first bearing plate.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] 1. The present invention modularizes the pallet, wherein the pallet is composed of two first load-bearing plates and two second load-bearing plates connected by a connecting assembly. When transporting the pallet, the pallet is split into multiple parts, which is convenient for loading the pallet onto a truck without the aid of a crane, thereby reducing the transportation cost of the pallet.

[0024] 2. The present invention sets a first carrier plate and a second carrier plate. When the workpiece is loaded into the furnace for heating, the first carrier plate and the second carrier plate are adjusted to have an angle of 10° between the lower support plate and the lower support plate. In this state, when the hot air flows to the bottom of the tray, it will be separated by the first carrier plate and the second carrier plate to form a Karman vortex street, thereby enhancing the heat transfer efficiency and improving the heating efficiency of the bottom of the workpiece.

[0025] 3. Before the workpiece is subjected to liquid quenching and cooling, the present invention rotates the locking nut so that the movable sleeve moves in a direction away from the first inner support rod under the action of the elastic member, thereby releasing the first inner support rod and the second inner support rod from fixing the hollow column, and rotating the two screws so that the two screws are close to each other, thereby squeezing the first bearing plate and the second bearing plate into a wave shape, and the top and bottom ends of the wave shape abut against the upper support plate and the lower support plate respectively, and the first bearing plate and the second bearing plate support the upper support plate, thereby preventing the upper support plate from being squeezed and deformed when the workpiece is overweight during lifting, thereby extending the service life of the device.

[0026] 4. The present invention can disassemble the tray for cleaning and drying, which is convenient for cleaning and drying and has high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a furnace tray for a box-type resistance heating furnace provided by the present invention;

[0028] Figure 2 It is a schematic diagram of the assembly structure of a first load-bearing plate and a second load-bearing plate for a furnace tray of a box-type resistance heating furnace provided by the present invention;

[0029] Figure 3 It is a schematic structural diagram of a first bearing plate for a furnace tray of a box-type resistance heating furnace provided by the present invention;

[0030] Figure 4 It is a schematic structural diagram of a second bearing plate for a box-type resistance heating furnace loading tray provided by the present invention;

[0031] Figure 5 It is a schematic structural diagram of a connection assembly for a furnace tray of a box-type resistance heating furnace provided by the present invention;

[0032] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0033] Figure 7 It is a schematic diagram of the structure of an elastic member for a furnace tray of a box-type resistance heating furnace provided by the present invention;

[0034] Figure 8 It is a schematic diagram of the side view of the heating structure of a furnace tray for a box-type resistance heating furnace provided by the present invention;

[0035] Fig. 9 It is a side view structural schematic diagram of a quenching furnace tray for a box-type resistance heating furnace provided by the present invention;

[0036] Fig.10 It is a schematic diagram of the deflection state of a first load-bearing plate and a second load-bearing plate for a furnace loading tray of a box-type resistance heating furnace provided by the present invention.

[0037] In the figure, 1 is a first bearing plate, 11 is an arc groove, 2 is a second bearing plate, 3 is a hollow column, 4 is a lifting ear, and 41 is a limiting groove;

[0038] 5 connecting shaft, 51 fixed sleeve, 511 first inner support rod, 52 movable sleeve, 521 second inner support rod;

[0039] 6 elastic member, 61 first connecting rod, 62 second connecting rod, 621 cavity, 622 spring;

[0040] 7 external thread, 71 locking nut, 72 extrusion ring, 8 fixing nut, 10 upper support plate, 9 lower support plate, 91 screw. DETAILED DESCRIPTION

[0041] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0042] like Figure 1-Figure 10 As shown, a furnace tray for a box-type resistance heating furnace comprises:

[0043] Two first bearing plates 1 and two second bearing plates 2, the length, width and height of the first bearing plates 1 and the second bearing plates 2 are the same, and a "M"-shaped grid is provided on the first bearing plates 1 and the second bearing plates 2, an arc groove 11 is provided on one side of the first bearing plate 1 along the length direction, and an arc groove 11 is provided on both sides of the second bearing plate 2 along the length direction, and a hollow column 3 is fixed in the arc groove 11, and the length of the hollow column 3 is equal to half the length of the first bearing plate 1;

[0044] The upper support plate 10 and the lower support plate 9 are snap-connected, and a "M"-shaped grid is provided on the upper support plate 10 and the lower support plate 9. The lower support plate 9 is threadedly connected with a screw 91, and the screw 91 abuts against the first bearing plate 1. The hollow column 3 passes through the lower support plate 9, and a through hole is opened on the lower support plate 9. The hollow column 3 passes through the through hole and cooperates with the through hole gap. The snap-connection method adopts the existing technology and will not be repeated again.

[0045] A connecting assembly, wherein the connecting assembly sequentially connects and fixes the two first supporting plates 1 and the two second supporting plates 2, and the connecting assembly comprises:

[0046] Connecting shaft 5;

[0047] A fixing sleeve 51, wherein at least four first inner support rods 511 are provided on the fixing sleeve 51;

[0048] A movable sleeve 52, wherein the movable sleeve 52 is provided with the same number of second inner support rods 521 as the first inner support rods 511;

[0049] One end of the connecting shaft 5 is provided with an external thread 7, the end of the external thread 7 is provided with a fixing nut 8, the external thread 7 is provided with a locking nut 71, the locking nut 71 is fixed with an extrusion ring 72, and the extrusion ring 72 abuts against the movable sleeve 52;

[0050] The elastic member 6 is located between the first inner support rod 511 and the second inner support rod 521 . When the movable sleeve 52 moves toward the first inner support rod 511 , the first inner support rod 511 and the second inner support rod 521 are opened into an umbrella shape under the action of the elastic member 6 .

[0051] When loading the workpiece into the furnace, place the lower support plate 9 on the trolley, insert the lifting ear 4 into the hollow column 3, and insert the connecting shaft 5 through the lifting ear 4 into the hollow column 3, control the angle between the two adjacent bearing plates to be 160°, then clamp the fixing nut 8 with the help of a tool, and then rotate the locking nut 71. Under the action of the threaded fit, the locking nut 71 drives the extrusion ring 72 to move toward the direction close to the first inner support rod 511 and squeeze the movable sleeve 52. Under the action of the elastic member 6, the first inner support rod 511 and the second inner support rod 521 are opened into an umbrella shape and squeezed on the inner wall of the hollow column 31, thereby fixing the hollow column 31, and then rotate the screw 91 to fix the bearing plate as a whole on the lower support plate 9. At this time, the angles between the first bearing plate 1 and the second bearing plate 2 and the horizontal plane are both 10° (such as Figure 8 As shown), the upper support plate 10 is then clamped on the lower support plate 9, the workpiece is placed on the pallet and then moved into the heating furnace by a trolley;

[0052] When hot air flows toward the bottom of the upper support plate 10, a Karman vortex street is generated. Experimental verification shows that when the angle between the first support plate 1 and the horizontal plane is 10°, the lift coefficient amplitude is the largest, the vortex shedding frequency is the smallest, and the heat transfer coefficient is the highest, thereby improving the heating efficiency of the bottom of the workpiece.

[0053] The elastic member 6 includes a first connecting rod 61 and a second connecting rod 62. The second connecting rod 62 is provided with a cavity 621. A spring 622 is provided in the cavity 621. The first connecting rod 61 is inserted into the cavity 621. When the first inner support rod 511 and the second inner support rod 521 are stretched apart, the spring 622 is in a compressed state.

[0054] One end of the hollow column 3 is detachably and rotatably connected to a lifting ear 4 , and a limiting groove 41 is provided on the side wall around the lifting ear 4 .

[0055] Before the workpiece is liquid quenched and cooled, the locking nut 71 is rotated to make the movable sleeve 52 move a short distance away from the first inner support rod 511, and the first inner support rod 511 and the second inner support rod 521 release the fixation to the hollow column 3. The two screws 91 are turned to continue to squeeze the first bearing plate 1 so that the wavy top and bottom ends are respectively in contact with the upper support plate 10 and the lower support plate 9, and then the locking nut 71 is tightened again. The first bearing plate 1 and the second bearing plate 2 support the upper support plate 10 to prevent the workpiece from squeezing and deforming the upper support plate 10 when it is overweight during lifting, thereby extending the service life of the device.

[0056] The working principle of the present invention is as follows:

[0057] When transporting the pallet, the lifting lug 4 and the connecting assembly are taken out from the hollow column 3 to split the pallet into multiple parts, which is convenient for moving and loading the pallet. Loading can be completed without the help of a crane, thereby reducing the transportation cost of the pallet.

[0058] When loading the workpiece into the furnace, place the lower support plate 9 on the trolley, insert the lifting ear 4 into the hollow column 3, and insert the connecting shaft 5 through the lifting ear 4 into the hollow column 3, control the angle between the two adjacent bearing plates to be 160°, then clamp the fixing nut 8 with the help of a tool, and then rotate the locking nut 71. Under the action of the threaded fit, the locking nut 71 drives the extrusion ring 72 to move toward the direction close to the first inner support rod 511 and squeeze the movable sleeve 52. Under the action of the elastic member 6, the first inner support rod 511 and the second inner support rod 521 are opened into an umbrella shape and squeezed on the inner wall of the hollow column 31, thereby fixing the hollow column 31, and then rotate the screw 91 to fix the bearing plate as a whole on the lower support plate 9. At this time, the angles between the first bearing plate 1 and the second bearing plate 2 and the horizontal plane are both 10° (such as Figure 8 As shown), the upper support plate 10 is then clamped on the lower support plate 9, the workpiece is placed on the pallet and then moved into the heating furnace by a trolley;

[0059] When the hot air flows to the bottom of the upper support plate 10, a Karman vortex street will be generated (the vortex direction is as follows Figure 8 As shown), it is verified by experiments that when the angle between the first bearing plate 1 and the horizontal plane is 10°, the lift coefficient amplitude is the largest, the vortex shedding frequency is the smallest, and the heat transfer coefficient is the highest, thereby improving the heating efficiency of the bottom of the workpiece;

[0060] Before the workpiece is liquid quenched and cooled, the locking nut 71 is rotated to move the movable sleeve 52 a short distance away from the first inner support rod 511, and the first inner support rod 511 and the second inner support rod 521 release the fixation on the hollow column 3, and the two screws 91 are rotated to continue to squeeze the first bearing plate 1 so that the top and bottom ends of the wave shape are respectively in contact with the upper support plate 10 and the lower support plate 9, and then the locking nut 71 is locked again, and the first bearing plate 1 and the second bearing plate 2 play a supporting role on the upper support plate 10, so as to prevent the workpiece from squeezing and deforming the upper support plate 10 under an overweight state during lifting, thereby extending the service life of the device;

[0061] After the workpiece is quenched and cooled, it is unloaded from the pallet, and then the pallet is split into multiple parts again to facilitate the cleaning and drying of the pallet and improve the efficiency of cleaning and drying. At the same time, after the pallet is split, it is convenient to move the pallet to the trolley for the next heat treatment.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A furnace tray for a box-type resistance heating furnace, characterized in that: include: Two first carrying plates (1) and two second carrying plates (2), wherein the length, width and height of the first carrying plates (1) and the second carrying plates (2) are the same, and the first carrying plates (1) and the second carrying plates (2) are both provided with a "M"-shaped grid; A connecting assembly, wherein the connecting assembly connects and fixes the two first supporting plates (1) and the two second supporting plates (2) in sequence; An upper support plate (10) and a lower support plate (9), wherein the upper support plate (10) and the lower support plate (9) are snap-connected, and a "M"-shaped grid is provided on the upper support plate (10) and the lower support plate (9).

2. The furnace loading tray for a box-type resistance heating furnace according to claim 1, characterized in that: The first bearing plate (1) is provided with an arc groove (11) on one side along the length direction, and the second bearing plate (2) is provided with an arc groove (11) on both sides along the length direction. A hollow column (3) is fixed in the arc groove (11), and the length of the hollow column (3) is equal to half the length of the first bearing plate (1), and the hollow column (3) passes through the lower support plate (9).

3. The furnace loading tray for a box-type resistance heating furnace according to claim 1, characterized in that: The connection component comprises: Connecting shaft (5); A fixing sleeve (51), wherein the fixing sleeve (51) is provided with at least four first inner support rods (511); A movable sleeve (52), wherein the movable sleeve (52) is provided with the same number of second inner support rods (521) as the first inner support rods (511); The elastic member (6) is located between the first inner support rod (511) and the second inner support rod (521). When the movable sleeve (52) moves in a direction close to the first inner support rod (511), the first inner support rod (511) and the second inner support rod (521) are opened into an umbrella shape under the action of the elastic member (6).

4. The furnace loading tray for a box-type resistance heating furnace according to claim 3, characterized in that: The elastic member (6) comprises a first connecting rod (61) and a second connecting rod (62); the second connecting rod (62) is provided with a cavity (621); a spring (622) is provided in the cavity (621); and the first connecting rod (61) is inserted into the cavity (621).

5. The furnace loading tray for a box-type resistance heating furnace according to claim 3, characterized in that: One end of the connecting shaft (5) is provided with an external thread (7), the end of the external thread (7) is provided with a fixing nut (8), the external thread (7) is provided with a locking nut (71), an extrusion ring (72) is fixed on the locking nut (71), and the extrusion ring (72) is in contact with the movable sleeve (52).

6. The furnace loading tray for a box-type resistance heating furnace according to claim 2, characterized in that: One end of the hollow column (3) is detachably and rotatably connected to a lifting ear (4), and a limiting groove (41) is provided on a peripheral side wall of the lifting ear (4).

7. The furnace loading tray for a box-type resistance heating furnace according to claim 1, characterized in that: The lower supporting plate (9) is threadedly connected with a screw (91), and the screw (91) abuts against the first bearing plate (1).

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