Energy-saving baking furnace

Abstract

The present application relates to the technical field of kiln, and more particularly to a roasting furnace capable of saving energy, comprising a trolley roasting furnace, and a clamping mechanism for clamping castings is arranged on the top of the trolley of the trolley roasting furnace. The clamping mechanism is composed of a guide frame, a clamping frame, a movable clamping plate, a horizontal rod, a telescopic rod, a spring one, an electric screw rod, a nut, a U-shaped block and a T-shaped slide rod. The clamping mechanism can automatically clamp the castings when the trolley drives the castings into the furnace body, and can automatically release the castings when the trolley drives the castings out of the furnace body, so as to facilitate subsequent part taking. In addition, the clamping mechanism can effectively separate the upper and lower adjacent castings during the roasting process of the castings, so as to avoid the mutual stacking of the castings, avoid the effective heat transfer being hindered, ensure the uniform distribution of heat, and make the whole castings be heated sufficiently. Therefore, the roasting efficiency of the castings can be improved, the roasting time can be shortened, the consumption of energy or fuel can be reduced, and the energy-saving effect can be achieved.

Description

Technical Field

[0001] This invention relates to the field of kiln technology, and in particular to an energy-saving roasting furnace. Background Technology

[0002] The sintering furnace is a core piece of equipment in the foundry industry used in precision casting processes. It is primarily used for preheating and sintering castings, effectively improving their forming accuracy. It is widely used in precision casting, wear-resistant steel quenching, and steel wire annealing, among other fields.

[0003] However, existing roasting furnaces lack an effective mechanism for separating adjacent castings. For hollow castings with gradually decreasing or increasing cross-sectional areas, batch roasting is typically carried out by stacking them from bottom to top. Because the castings are stacked, some areas are blocked, making it difficult to distribute heat evenly, thus requiring a longer roasting time to ensure the casting is fully heated overall. This stacking method creates a thermal resistance layer between the casting contact surfaces, further hindering effective heat transfer and significantly slowing the heating rate of the blocked areas. To compensate for the decreased heat transfer efficiency, the roasting time must be extended, which not only reduces production efficiency but also increases energy or fuel consumption. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-efficient roasting furnace that has the function of separating adjacent upper and lower castings in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned objectives through the following technical solution: an energy-saving roasting furnace, comprising a trolley-type roasting furnace, wherein the top of the trolley of the trolley-type roasting furnace is provided with a clamping mechanism for clamping castings, the clamping mechanism including a guide frame connected to the top of the trolley of the trolley-type roasting furnace, clamping frames being slidably provided on the guide frame at intervals along the vertical direction, a set of movable clamping plates being slidably connected to both sides of the clamping frame, each set of movable clamping plates being connected with a crossbar, the crossbar being slidably engaged with the clamping frame, a telescopic rod being provided on the upper side of the clamping frame, the telescopic rod being fixedly connected to the top of the outermost movable clamping plate of the two sets of movable clamping plates to drive the two sets of movable clamping plates to move synchronously, a spring being connected between the fixed end and the movable end of the telescopic rod, the telescopic rod entering the furnace body of the trolley-type roasting furnace to contact the furnace body and be squeezed by the furnace body to move, thereby driving the movable clamping plates to move and cooperate with the clamping frames to clamp the castings, the trolley of the trolley-type roasting furnace being provided with a drive assembly for driving the clamping frames to rise and fall, so as to separate adjacent castings.

[0006] Preferably, the drive assembly includes an electric lead screw mounted on the trolley of the trolley-type roasting furnace. The lead screw is rotatably connected to the guide frame. The lead screw passes through the clamping frame. A nut is embedded in the uppermost clamping frame and threaded onto the lead screw of the electric lead screw. A set of U-shaped blocks is connected to the bottom of each clamping frame except the lowermost clamping frame. A T-shaped slide rod is slidably connected to the U-shaped block and fixedly connected to the top of the clamping frame below it.

[0007] Preferably, the top of the trolley-type roasting furnace is equipped with a waste heat recovery mechanism. The waste heat recovery mechanism includes a storage cylinder installed on the top of the furnace body. A blower is installed on the outside of the storage cylinder. The blower is connected to the chimney of the trolley-type roasting furnace through a conveying pipe. The blower is connected to the storage cylinder through a conveying pipe. The storage cylinder is connected to the furnace body through a conveying pipe. An electric push rod is installed on the outside of the storage cylinder. A blocking plate located inside the storage cylinder is connected to the push rod of the electric push rod to block the air outlet of the conveying pipe and the air inlet of the conveying pipe.

[0008] Preferably, a second spring is fitted on the crossbar, one end of the second spring is connected to the adjacent movable clamping plate, and the other end of the second spring is connected to the clamping frame.

[0009] Preferably, the trolley of the trolley-type roasting furnace is provided with an ejection mechanism for ejecting the casting from the inside of the clamping frame. The ejection mechanism includes two slide plates set on the top of the trolley, with push plates connected at intervals on the top of the slide plates. The trolley is provided with a pushing component that pushes the two push plates away from each other.

[0010] Preferably, the pushing assembly includes two sliding rods slidably connected to the trolley, the two sliding rods being located between two slide plates, and each end of the two sliding rods being connected to an inclined plate, the two inclined plates respectively contacting the two slide plates. Two electric push rods are installed on the outside of the trolley, the two electric push rods being respectively connected to the two sliding rods, and a spring is connected between the two slide plates.

[0011] Preferably, the trolley of the trolley-type roasting furnace is equipped with a cooling mechanism, which includes two jet pipes connected to the trolley for spraying gas upwards onto the casting. A second fan is installed at the bottom of the trolley, and the second fan is connected to the jet pipes through a gas supply pipe.

[0012] Preferably, ball bearings are provided at intervals on the movable end of the telescopic rod to reduce the friction between the telescopic rod and the furnace body of the trolley-type roasting furnace.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The clamping mechanism, composed of a guide frame, clamping frame, movable clamping plate, crossbar, telescopic rod, spring, electric lead screw, nut, U-shaped block, and T-shaped slide bar, can automatically clamp the casting as the trolley moves the casting into the furnace, and automatically release the casting as the trolley moves the casting out of the furnace for easy removal. Furthermore, it can effectively separate adjacent castings during the firing process, preventing them from stacking and obstructing heat transfer, ensuring uniform heat distribution, and allowing the casting to be fully heated. This improves firing efficiency, shortens firing time, reduces energy or fuel consumption, and achieves energy-saving effects.

[0015] 2. By configuring the storage cylinder, fan one, conveying pipe one, conveying pipe two, and conveying pipe three, the hot gas discharged from the bogie-type roasting furnace can flow back into it, realizing the recycling of heat, further reducing energy or fuel consumption, and improving the overall energy-saving effect. By configuring the electric push rod one and the blocking plate, the high-temperature gas in the storage cylinder can be prevented from escaping to the outside. Thus, when preparing for the next round of roasting, the stored high-temperature gas can be injected into the bogie-type roasting furnace for preheating, thereby effectively reducing energy or fuel consumption and improving roasting efficiency.

[0016] 3. By pushing the component, the two slide plates can be pushed away from each other, thereby pushing the casting out from the inside of the clamping frame, so as to facilitate subsequent part removal.

[0017] 4. By combining the jet pipe, fan 2, and air supply pipe, the casting can be air-cooled, thereby improving cooling efficiency, shortening cooling time, facilitating subsequent handling, reducing the risk of burns, and enhancing overall safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0020] Figure 3 This is a diagram showing the working state of the clamping mechanism of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the clamping mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the installation of the ball bearings of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the driving component of the present invention.

[0024] Figure 7This is a three-dimensional structural diagram of the waste heat recovery mechanism of the present invention.

[0025] Figure 8 This is a three-dimensional structural diagram of the ejection mechanism of the present invention.

[0026] Figure 9 This is a schematic diagram of the installation of the cooling mechanism of the present invention.

[0027] In the diagram: 1-Cart-type roasting furnace, 11-Furnace body, 12-Cart, 13-Railway, 14-Sealed door, 15-Support, 16-Electric winding reel, 17-Wire rope, 18-Chimney, 21-Guide frame, 211-Connecting plate, 212-Guide rail, 22-Clamping frame, 221-Slide rail, 222-Fixed clamping plate, 23-Modible clamping plate, 24-Crossbar, 25-Telescopic rod, 26-Spring 1, 27-Electric lead screw, 28-Screw Mother, 29-U-shaped block, 210-T-shaped slide bar, 3-Spring 2, 4-Ball bearing, 51-Storage cylinder, 52-Fan 1, 53-Conveying pipe 1, 54-Conveying pipe 2, 55-Conveying pipe 3, 56-Electric push rod 1, 57-Blocking plate, 60-Guide rod, 61-Slide plate, 62-Push plate, 63-Sliding rod, 64-Inclined plate, 65-Electric push rod 2, 66-Spring 3, 71-Jet pipe, 72-Fan 2, 73-Air supply pipe. Detailed Implementation

[0028] Please see Figures 1-6An energy-saving roasting furnace includes a trolley-type roasting furnace 1. The trolley-type roasting furnace 1 includes a furnace body 11, a trolley 12, a track 13, a sealing door 14, a support 15, an electric winding wheel 16, a wire rope 17, and a chimney 18. The left side of the furnace body 11 is open-type, and the furnace body 11 employs a side heating design. Heating elements or heat sources are installed on the side wall of the furnace body 11, meaning heat is transferred to the interior of the furnace chamber through the side of the furnace body 11 to achieve uniform heating of the castings. The bottom of the furnace body 11 is connected to the track 13 to guide the trolley 12 to move left and right, facilitating the smooth entry and exit of the trolley 12 from the furnace body 11. The top left side of the furnace body 11 is slidably connected to a lifting sealing door 14 for sealing the furnace body 11. The top left side of the furnace body 11 is connected to... The furnace body 11 is equipped with two supports 15, one at the front and one at the back. An electric winding wheel 16 is installed between the upper parts of the two supports 15, and a steel wire rope 17 is wound on the electric winding wheel 16. The steel wire rope 17 is connected to the top of the sealing door 14 to drive the sealing door 14 to rise and fall. A chimney 18 is installed on the upper right side of the furnace body 11. The top of the trolley 12 is equipped with a clamping mechanism for holding the casting. The clamping mechanism includes a guide frame 21 connected to the top of the trolley 12. The guide frame 21 includes two connecting plates 211, one above the other, and five guide rails 212 evenly spaced from left to right between the two connecting plates 211. The lower connecting plate 211 is connected to the top of the trolley 12. Six clamping frames 22 are slidably arranged vertically between the five guide rails 212. Each clamping frame 22 includes a slidably mounted on one of the five guide rails 212. The slide rail 221 between 12 and the front and rear fixed clamps 222 connected to the slide rail 221, each set of fixed clamps 222 has five plates, and the five plates in each set are spaced apart from left to right. The five plates in each set slide with the five guide rails 212. The front and rear sides of the slide rail 221 are slidably connected to a set of movable clamps 23, each set of movable clamps 23 has five plates, and the five plates in each set are spaced apart from left to right. The fixed clamps 222 and movable clamps 23 are both made of copper with good thermal conductivity. Each set of movable clamps 23 is connected to a crossbar 24, which slides through the fixed clamps 222. The top of the two rightmost movable clamps 23 is... A telescopic rod 25 connects the parts, and a spring 26 connects the fixed end and the movable end of the telescopic rod 25. The spring 26 is sleeved on the telescopic rod 25. The trolley 12 is equipped with a drive assembly for driving the clamping frame 22 to rise and fall, so as to separate adjacent castings. The drive assembly includes an electric lead screw 27 mounted on the trolley 12. The motor on the electric lead screw 27 is mounted at the bottom of the trolley 12 to avoid the motor being affected by high temperature. The lead screw on the electric lead screw 27 is rotatably connected to the connecting plate 211 on the guide frame 21. The lead screw on the electric lead screw 27 slides through the slide rail 221 on the clamping frame 22. A nut 28 is embedded in the slide rail 221 of the uppermost clamping frame 22. The nut 28 is threadedly connected to the lead screw of the electric lead screw 27.Except for the bottommost slide rail 221, each of the other slide rails 221 has a set of two U-shaped blocks 29 connected to its bottom. The two U-shaped blocks 29 in each set are arranged side-by-side. A T-shaped slide rod 210 is slidably connected to each U-shaped block 29. The T-shaped slide rod 210 is fixedly connected to the top of the slide rail 221 below it. A spring 3 is fitted onto the crossbar 24. The right end of the spring 3 is connected to a movable clamping plate 23 located on its right side, and the left end of the spring 3 is connected to a fixed clamping plate 222 located on its left side. The right end of the movable end of the telescopic rod 25 is provided with ball bearings 4 at intervals. The ball bearings 4 reduce the friction between the telescopic rod 25 and the furnace body 11, allowing the telescopic rod 25 to smoothly rise and fall while closely adhering to the inner right wall of the furnace body 11, reducing wear on both the telescopic rod 25 and the furnace body 11, and extending their service life.

[0029] First, the hollow castings with gradually decreasing or increasing cross-sectional areas, stacked from bottom to top, are placed on the trolley 12, positioned between the fixed clamping plate 222 and the movable clamping plate 23. The trolley 12 is then pushed to the right into the furnace body 11, thereby pulling the casting and clamping mechanism into the furnace body 11. When the telescopic rod 25 moves to the right and contacts the inner right wall of the furnace body 11, it cannot move further to the right due to the support of the furnace body 11 and spring 26. This prevents the rightmost movable clamping plate 23 from moving further to the right, and the crossbar 24 positions the remaining movable clamping plates 23, preventing them from moving further to the right. The guide frame 21 then moves to the right, driving the clamping frame 22 to the right, compressing spring 3. The casting is then clamped by the cooperation of the fixed clamping plate 222 and the movable clamping plate 23 on the clamping frame 22. After the casting is clamped by the fixed clamping plate 222 and the movable clamping plate 23, the clamping frame 22 continues to move to the right, pushing the movable clamping plate 23 to the right through the casting, thereby compressing the telescopic rod 25 and the spring 26 to accommodate castings of different sizes.

[0030] Then, the electric lead screw 27 is controlled to rotate, driving the nut 28 to move the uppermost clamping frame 22 upward. The uppermost movable clamping plate 23 moves upward synchronously, thereby moving the uppermost casting upward and separating it from the next casting. When the U-shaped block 29 at the bottom of the uppermost clamping frame 22 moves upward and contacts the inner top of the uppermost T-shaped slide bar 210, the U-shaped block 29 on the uppermost clamping frame 22 continues to move upward, pulling the uppermost T-shaped slide bar 210 upward, thereby pulling the next clamping frame 22 upward, and so on, so that the castings stacked from bottom to top can be separated sequentially. In this way, the roasting furnace has the function of separating adjacent castings, which can effectively separate adjacent castings, avoid the stacking and blocking of castings, and prevent them from obstructing the effective transfer of heat. This ensures that the heat is evenly distributed, so that the castings are fully heated as a whole, thereby improving the roasting efficiency of castings, shortening the roasting time, reducing energy or fuel consumption, and achieving energy-saving effects. Since both the fixed clamping plate 222 and the movable clamping plate 23 are made of copper with good thermal conductivity, heat can be quickly transferred to the casting, ensuring that the parts of the casting clamped by the fixed clamping plate 222 and the movable clamping plate 23 are heated evenly and fully.

[0031] After the castings are baked, the electric screw 27 is reversed to drive the nut 28 to move the uppermost clamping frame 22 downwards. Under the action of gravity, the remaining clamping frames 22 also move downwards, allowing the baked castings to be stacked from bottom to top for easy removal later. Then, the trolley 12 is moved to the left from inside the furnace body 11, thereby moving the castings and clamping mechanisms out of the furnace body 11. The telescopic rod 25 then disengages from the furnace body 11. Under the reset action of spring 1 26, the telescopic rod 25 extends and resets. Under the reset action of spring 2 3, it pushes the movable clamping plate 23 connected to it to move to the right, thereby driving the remaining movable clamping plates 23 to move to the right synchronously through the crossbar 24, thus releasing the castings for easy removal later.

[0032] Please see Figure 7 The top right side of the furnace body 11 is provided with a waste heat recovery mechanism. The waste heat recovery mechanism includes a storage cylinder 51 installed on the top right side of the furnace body 11. A fan 52 is installed on the right side of the outer wall of the storage cylinder 51. The fan 52 is connected to the chimney 18 through a conveying pipe 53. The fan 52 is connected to the storage cylinder 51 through a conveying pipe 54. The storage cylinder 51 is connected to the furnace body 11 through a conveying pipe 55. An electric push rod 56 is installed on the rear side of the outer wall of the storage cylinder 51. A blocking plate 57 located inside the storage cylinder 51 is connected to the push rod of the electric push rod 56 for sealing the air outlet end of the conveying pipe 54 and the air inlet end of the conveying pipe 55.

[0033] The blower 52 is controlled to operate, thereby drawing hot air from the furnace body 11 into the storage cylinder 51 through the chimney 18, conveying pipe 53, and conveying pipe 54. The hot air in the storage cylinder 51 then flows back into the furnace body 11 through conveying pipe 55, achieving heat recycling and further reducing energy or fuel consumption, thus improving overall energy efficiency. Before the sealing door 14 is raised and opened, the electric push rod 56 is controlled to drive the blocking plate 57 forward to block the outlet end of conveying pipe 54 and the inlet end of conveying pipe 55, thereby storing the hot air in the storage cylinder 51 to prevent the high-temperature gas in the storage cylinder 51 from escaping to the outside. When the sealing door 14 descends and closes in preparation for the next round of roasting, the electric push rod 56 drives the blocking plate 57 to move backward, releasing the blockage at the outlet of the second conveying pipe 54 and the inlet of the third conveying pipe 55. At the same time, the blower 52 is controlled to work, injecting the high-temperature gas stored in the storage cylinder 51 into the furnace body 11 to achieve preheating, thereby effectively reducing energy or fuel consumption and improving roasting efficiency.

[0034] Please see Figure 8 The trolley 12 is equipped with a pushing mechanism for pushing the casting out from the inside of the clamping frame 22. The pushing mechanism includes a guide rod 60 connected to the left side of the trolley 12, with two sliding plates 61 slidably connected to the guide rod 60. The top of the trolley 12 has a groove to guide the sliding plates 61 to move back and forth. Five push plates 62 are connected from left to right on the top of the sliding plates 61. Each push plate 62 is located between the adjacent fixed clamping plates 222 and movable clamping plates 23, and the push plate 62 is close to the fixed clamping plate 222 to avoid obstructing the movement of the movable clamping plate 23 to clamp the casting. The trolley 12 is equipped with a mechanism to push the two push plates 62 away from each other. The pushing assembly includes two sliding rods 63 that are slidably connected to the trolley 12. The two sliding rods 63 are located between two slide plates 61. The right end of each sliding rod 63 is connected to an inclined plate 64. The two inclined plates 64 contact the two slide plates 61 respectively. Two electric push rods 65 are installed on the left outer wall of the trolley 12. The two electric push rods 65 are connected to the two sliding rods 63 respectively. The electric push rods 65 will not enter the furnace body 11 to avoid the electric push rods 65 being affected by high temperature. A spring 66 is sleeved on the guide rod 60. The two ends of the spring 66 are connected to the two slide plates 61 respectively.

[0035] After the trolley 12 moves out of the furnace body 11, the control electric push rod 65 drives the sliding rod 63 to move the inclined plate 64 to the left. When the two inclined plates 64 move to the left, they push the two sliding plates 61 away from each other, thereby causing the push plates 62 on the front and rear sides to move away from each other, pushing the casting out from the inside of the clamping frame 22 for subsequent removal. The two sliding plates 61 moving away from each other stretch the spring 66, and the control electric push rod 65 drives the sliding rod 63 to move the inclined plate 64 to the right to reset. Under the reset action of the spring 66, the two sliding plates 61 can be pulled closer to each other, thereby causing the push plates 62 on the front and rear sides to move closer to each other.

[0036] Please see Figure 9 The trolley 12 is equipped with a cooling mechanism, which includes two jet pipes 71 connected to the front and rear of the trolley 12 for spraying gas upwards onto the casting. A second fan 72 is installed at the bottom of the trolley 12 to prevent the second fan 72 from being affected by high temperature. The second fan 72 is connected to the jet pipe 71 through the air supply pipe 73.

[0037] After the trolley 12 is removed from the furnace body 11, the second control fan 72 is activated to transport external gas through the gas supply pipe 73 to the jet pipe 71. The jet pipe 71 then sprays the gas upwards onto the casting to perform air cooling treatment on the casting, thereby improving cooling efficiency, shortening cooling time, facilitating subsequent part removal operations, reducing the risk of burns, and improving overall safety.

Claims

1. An energy-efficient roasting furnace, characterized in that, The furnace includes a bogie-type roasting furnace (1). The top of the bogie (12) of the bogie-type roasting furnace (1) is provided with a clamping mechanism for clamping castings. The clamping mechanism includes a guide frame (21) connected to the top of the bogie (12) of the bogie-type roasting furnace (1). The guide frame (21) is provided with clamping frames (22) at intervals in the vertical direction. Both sides of the clamping frame (22) are slidably connected with a set of movable clamping plates (23). Each set of movable clamping plates (23) is connected with a crossbar (24). The crossbar (24) is slidably engaged with the clamping frame (22). The upper side of the clamping frame (22) is provided with a telescopic rod (25). The telescopic rod (25) is fixedly connected to... The top of the outermost movable clamping plate (23) of the two sets of movable clamping plates (23) is connected to drive the two sets of movable clamping plates (23) to move synchronously. A spring (26) is connected between the fixed end and the movable end of the telescopic rod (25). The telescopic rod (25) enters the furnace body (11) of the trolley-type roasting furnace (1) and can contact the furnace body (11) and be squeezed by the furnace body (11) to move, thereby driving the movable clamping plate (23) to move and cooperate with the clamping frame (22) to clamp the casting. The trolley (12) of the trolley-type roasting furnace (1) is equipped with a drive assembly for driving the clamping frame (22) to rise and fall, so that the upper and lower adjacent castings are separated. The drive assembly includes an electric lead screw (27) mounted on the trolley (12) of the trolley-type roasting furnace (1). The lead screw on the electric lead screw (27) is rotatably connected to the guide frame (21). The lead screw on the electric lead screw (27) passes through the clamping frame (22). A nut (28) is embedded in the uppermost clamping frame (22). The nut (28) is threaded onto the lead screw of the electric lead screw (27). Except for the lowermost clamping frame (22), the bottom of the other clamping frames (22) is connected to a set of U-shaped blocks (29). A T-shaped slide rod (210) is slidably connected to the U-shaped block (29). The T-shaped slide rod (210) is fixedly connected to the top of the clamping frame (22) below it. A second spring (3) is fitted on the crossbar (24). One end of the second spring (3) is connected to the adjacent movable clamp (23), and the other end of the second spring (3) is connected to the clamping frame (22).

2. The energy-saving roasting furnace according to claim 1, characterized in that, The top of the furnace body (11) of the trolley-type roasting furnace (1) is equipped with a waste heat recovery mechanism. The waste heat recovery mechanism includes a storage cylinder (51) installed on the top of the furnace body (11). A fan (52) is installed on the outside of the storage cylinder (51). The fan (52) is connected to the chimney (18) of the trolley-type roasting furnace (1) through a conveying pipe (53). The fan (52) is connected to the storage cylinder (51) through a conveying pipe (54). The storage cylinder (51) is connected to the furnace body (11) through a conveying pipe (55). An electric push rod (56) is installed on the outside of the storage cylinder (51). A blocking plate (57) located inside the storage cylinder (51) is connected to the push rod of the electric push rod (56) for sealing the outlet end of the conveying pipe (54) and the inlet end of the conveying pipe (55).

3. The energy-saving roasting furnace according to claim 2, characterized in that, The trolley (12) of the trolley-type roasting furnace (1) is provided with an ejection mechanism for ejecting the casting from the inside of the clamping frame (22). The ejection mechanism includes two slide plates (61) set on the top of the trolley (12), and push plates (62) are connected at intervals on the top of the slide plates (61). The trolley (12) is provided with a push assembly that pushes the two push plates (62) away from each other.

4. The energy-saving roasting furnace according to claim 3, characterized in that, The pushing assembly includes two sliding rods (63) slidably connected to the trolley (12). The two sliding rods (63) are located between two slide plates (61). The ends of the two sliding rods (63) are connected to inclined plates (64). The two inclined plates (64) contact the two slide plates (61) respectively. Two electric push rods (65) are installed on the outside of the trolley (12). The two electric push rods (65) are connected to the two sliding rods (63) respectively. A spring (66) is connected between the two slide plates (61).

5. An energy-saving roasting furnace according to claim 4, characterized in that, The trolley (1) of the trolley-type roasting furnace (1) is equipped with a cooling mechanism. The cooling mechanism includes two jet pipes (71) connected to the trolley (12) for spraying gas upward onto the casting. A second fan (72) is installed at the bottom of the trolley (12). The second fan (72) is connected to the jet pipe (71) through a gas supply pipe (73).

6. The energy-saving roasting furnace according to claim 1, characterized in that, The movable end of the telescopic rod (25) is provided with ball bearings (4) at intervals to reduce the friction between the telescopic rod (25) and the furnace body (11) of the trolley-type roasting furnace (1).

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