Roasting furnace capable of saving energy

Abstract

The invention relates to the technical field of kilns, in particular to an energy-saving roasting furnace which comprises a trolley type roasting furnace, and a clamping mechanism used for clamping a casting is arranged at the top of a trolley of the trolley type roasting furnace. By means of a clamping mechanism composed of a guide frame, a clamping frame, a movable clamping plate, a transverse rod, a telescopic rod, a first spring, an electric lead screw, a nut, a U-shaped block and a T-shaped sliding rod, the casting can be automatically clamped while the trolley drives the casting to enter a furnace body, and the casting can be automatically loosened while the trolley drives the casting to move out of the furnace body, so that follow-up piece taking is facilitated; in addition, the upper and lower adjacent castings can be effectively separated in the casting roasting process, the situation that effective heat transfer is hindered due to mutual stacking and shielding of the castings is avoided, uniform heat distribution is ensured, the castings are fully heated as a whole, and therefore the casting roasting efficiency can be improved, the roasting time can be shortened, energy or fuel consumption can be reduced, and the energy-saving effect can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of kilns, and in particular to an energy-saving roasting furnace. Background Art

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

[0003] However, existing roasting furnaces lack a mechanism to effectively separate adjacent upper and lower castings. For hollow castings with a gradually decreasing or increasing cross-sectional area, batch roasting is usually carried out by stacking from bottom to top during the roasting process. Since the castings are stacked on top of each other, some areas of the castings are blocked, making it difficult to evenly distribute heat, thereby requiring a longer roasting time to ensure that the casting as a whole is fully heated. This stacking method will form a thermal resistance layer between the contact surfaces of the castings, further hindering the effective transfer of heat, causing the temperature rise rate of the blocked part of the casting to be significantly slowed down. In order to compensate for the decline in heat transfer efficiency, the roasting time has to be extended, which not only reduces production efficiency, but also increases energy or fuel consumption. Summary of the Invention

[0004] The object of the present invention is to provide an energy-saving roasting furnace with the function of separating upper and lower adjacent castings in order to solve the above problems.

[0005] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0006] Preferably, the driving assembly includes an electric screw arranged on the trolley of the trolley-type roasting furnace, the screw on the electric screw is rotatably connected to the guide frame, the screw on the electric screw passes through the clamping frame, a nut is embedded in the uppermost clamping frame, the nut is threadedly connected to the screw of the electric screw, and a group of U-shaped blocks are connected to the bottom of the clamping frames except the lowermost clamping frame, and a T-shaped slide rod is slidably connected to the U-shaped block, and the T-shaped slide rod is fixedly connected to the top of the clamping frame below it.

[0007] Preferably, a waste heat recovery mechanism is provided on the top of the furnace body of the trolley-type roasting furnace, and the waste heat recovery mechanism includes a storage cylinder installed on the top of the furnace body, and a fan 1 is installed on the outside of the storage cylinder, and the fan 1 is connected to the chimney of the trolley-type roasting furnace through a delivery pipe 1, and the fan 1 is connected to the storage cylinder through a delivery pipe 2, and the storage cylinder is connected to the furnace body through a delivery pipe 3, and an electric push rod 1 is installed on the outside of the storage cylinder, and the push rod of the electric push rod 1 is connected to a blocking plate located in the storage cylinder, which is used to seal the air outlet end of the delivery pipe 2 and the air inlet end of the delivery pipe 3.

[0008] Preferably, a second spring is sleeved 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 pushing the casting out from the inside of the clamping frame. The ejection mechanism includes two slides arranged on the top of the trolley, and push plates are connected to the top of the slides at intervals. The trolley is provided with a pushing assembly for pushing 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 are located between the two slides, the ends of the two sliding rods are connected to inclined plates, the two inclined plates are respectively in contact with the two slides, two electric push rods 2 are installed on the outside of the trolley, the two electric push rods 2 are respectively connected to the two sliding rods, and a spring 3 is connected between the two slides.

[0011] Preferably, a cooling mechanism is provided on the trolley of the trolley-type roasting furnace, which includes two injection pipes connected to the trolley for spraying gas upward onto the casting. A second fan is installed at the bottom of the trolley and is connected to the injection pipe through an air supply pipe.

[0012] Preferably, balls 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 present invention has the following beneficial effects: 1. Through the clamping mechanism composed of a guide frame, a clamping frame, a movable splint, a cross bar, a telescopic rod, a spring, an electric screw, a nut, a U-shaped block and a T-shaped slide bar, the casting can be automatically clamped when the trolley drives the casting into the furnace body, and the casting can be automatically released when the trolley drives the casting out of the furnace body to facilitate subsequent removal; and the castings adjacent to each other can be effectively separated during the casting roasting process to avoid stacking and blocking of the castings to hinder the effective transfer of heat, ensure uniform heat distribution, and make the casting fully heated as a whole, thereby improving the casting roasting efficiency, shortening the roasting time, reducing energy or fuel consumption, and achieving energy-saving effects.

[0014] 2. By setting up the storage cylinder, fan 1, conveying pipe 1, conveying pipe 2 and conveying pipe 3, the hot gas exhausted from the trolley-type roasting furnace can be returned to the trolley-type roasting furnace, thereby realizing heat recycling, further reducing energy or fuel consumption, and improving the overall energy-saving effect; by setting up the electric push rod 1 and the blocking plate, the high-temperature gas in the storage cylinder can be prevented from escaping to the outside, so that when preparing for the next round of roasting, the stored high-temperature gas can be injected into the trolley-type roasting furnace for preheating, thereby effectively reducing energy or fuel consumption and improving roasting efficiency.

[0015] 3. The pushing assembly can push the two slides away from each other, so that the push plates on both sides move away from each other and push the casting out from the inside of the clamping frame to facilitate subsequent removal.

[0016] 4. Through the cooperation of the air jet pipe, fan 2 and air pipe, the casting can be air-cooled, thereby improving cooling efficiency, shortening cooling time, facilitating subsequent removal operations, reducing the risk of scalding, and improving overall safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 .

[0018] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 .

[0019] Figure 3 This is a working state diagram of the clamping mechanism of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention.

[0021] Figure 5 Schematic diagram of the installation of the ball of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the drive assembly of the present invention.

[0023] Figure 7It is a schematic diagram of the three-dimensional structure of the waste heat recovery mechanism of the present invention.

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the ejection mechanism of the present invention.

[0025] Figure 9 Schematic diagram of the installation of the cooling mechanism of the present invention.

[0026] In the figure: 1-trolley type roasting furnace, 11-furnace body, 12-trolley, 13-track, 14-sealed door, 15-bracket, 16-electric winding wheel, 17-wire rope, 18-chimney, 21-guide frame, 211-connecting plate, 212-guide rail, 22-clamping frame, 221-slide rail, 222-fixed splint, 23-movable splint, 24-cross bar, 25-telescopic rod, 26-spring 1, 27-electric screw, 28-screw Mother, 29-U-shaped block, 210-T-shaped slide bar, 3-spring 2, 4-ball, 51-storage cylinder, 52-fan 1, 53-delivery pipe 1, 54-delivery pipe 2, 55-delivery 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-injection pipe, 72-fan 2, 73-air pipe. DETAILED DESCRIPTION

[0027] See also Figures 1-6, an energy-saving roasting furnace, including a trolley roasting furnace 1, the trolley roasting furnace 1 includes a furnace body 11, a trolley 12, a track 13, a sealed door 14, a bracket 15, an electric winding wheel 16, a wire rope 17 and a chimney 18. The left side of the furnace body 11 adopts an open design, and the furnace body 11 adopts a side heating design. The heating element or heat source is installed on the side wall of the furnace body 11, that is, the heat is transferred to the inside of the furnace through the side of the furnace body 11 to achieve uniform heating of the casting. The bottom of the furnace body 11 is connected with a track 13 for guiding the trolley 12 to move left and right so that the trolley 12 can smoothly enter and exit the furnace body 11. The left side of the top of the furnace body 11 is slidably connected with a sealed door 14 that can be lifted and lowered for sealing the furnace body 11. The left side of the top of the furnace body 11 is connected There are two front and rear brackets 15 connected, an electric winding wheel 16 is installed between the upper parts of the two brackets 15, a steel wire rope 17 is wound on the electric winding wheel 16, and 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 part of the furnace body 11. A clamping mechanism for clamping the casting is provided on the top of the trolley 12. The clamping mechanism includes a guide frame 21 connected to the top of the trolley 12. The guide frame 21 includes two upper and lower connecting plates 211 and five guide rails 212 evenly spaced from left to right and connected 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 provided at intervals in the vertical direction between the five guide rails 212. The clamping frame 22 includes a sliding arrangement on the five guide rails 2 12 and the front and rear groups of fixed splints 222 connected to the slide rails 221, the number of each group of fixed splints 222 is five, and the five fixed splints 222 in each group are spaced from left to right, and the five fixed splints 222 in each group slide with the five guide rails 212 respectively, and the front and rear sides of the slide rail 221 are slidably connected with a group of movable splints 23, the number of each group of movable splints 23 is five, and the five movable splints 23 in each group are spaced from left to right, and the fixed splints 222 and the movable splints 23 are made of copper with good thermal conductivity, and each group of movable splints 23 is connected with a cross bar 24, which slides through the fixed splint 222, and the top of the two front and rear movable splints 23 at the rightmost end is connected. A telescopic rod 25 is connected between the parts, and a spring 26 is connected between the fixed end and the movable end of the telescopic rod 25. The spring 26 is sleeved on the telescopic rod 25. A driving assembly for driving the clamping frame 22 to rise and fall is provided on the trolley 12 to separate the upper and lower adjacent castings. The driving assembly includes an electric screw 27 arranged on the trolley 12. The motor on the electric screw 27 is installed at the bottom of the trolley 12 to prevent the motor from being affected by high temperature. The screw on the electric screw 27 is rotatably connected to the connecting plate 211 on the guide frame 21. The screw on the electric 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 screw of the electric screw 27.The bottom of each of the other slide rails 221 except the bottom slide rail 221 is connected to a group of U-shaped blocks 29. Each group of U-shaped blocks 29 has two U-shaped blocks 29. The two U-shaped blocks 29 in each group are set on the left and right. A T-shaped slide bar 210 is slidably connected to the U-shaped block 29. The T-shaped slide bar 210 is fixedly connected to the top of the slide rail 221 below it. A spring 23 is sleeved on the cross bar 24. The right end of the spring 23 is connected to the movable splint 23 on its right side, and the left end of the spring 23 is connected to the fixed splint 222 on its left side. The right end of the movable end of the telescopic rod 25 is rotatably provided with a ball 4 at intervals. The ball 4 can reduce the friction between the telescopic rod 25 and the furnace body 11, so that the telescopic rod 25 can be smoothly raised and lowered when it is close to the right inner wall of the furnace body 11, reducing the wear on the telescopic rod 25 and the furnace body 11, and extending the service life of the telescopic rod 25 and the furnace body 11.

[0028] First, the hollow castings, stacked from bottom to top and with gradually decreasing or increasing cross-sectional areas, are placed on the trolley 12, with the castings positioned between the fixed clamping plate 222 and the movable clamping plate 23. The trolley 12 is then pushed rightward into the furnace body 11, thereby driving the castings and the clamping mechanism into the furnace body 11. When the telescopic rod 25 moves rightward until it contacts the right inner wall of the furnace body 11, the telescopic rod 25 cannot move further rightward due to the support of the furnace body 11 and spring 1 26, thereby supporting the rightmost movable clamping plate 23. The rightmost movable clamping plate 23 cannot move further to the right. The remaining movable clamping plates 23 are positioned by the crossbar 24, preventing all movable clamping plates 23 from moving further to the right. As a result, the guide frame 21 continues to move rightward, driving the clamping frame 22 further rightward, compressing the spring 2 3, and then the fixed clamping plate 222 and the movable clamping plate 23 on the clamping frame 22 cooperate to clamp the casting. After the casting is clamped by the fixed clamping plate 222 and the movable clamping plate 23, the clamping frame 22 continues to push the movable clamping plate 23 to the right through the casting, thereby compressing the telescopic rod 25 and the spring 1 26 to adapt to clamping castings of different sizes.

[0029] Then, the electric screw 27 is controlled to rotate to drive the nut 28 to drive the uppermost clamping frame 22 to move upward, and the uppermost movable clamping plate 23 is synchronously moved upward, thereby driving the uppermost casting to move up and separate from the next casting. When the U-shaped block 29 at the bottom of the uppermost clamping frame 22 moves up to contact the inner top of the uppermost T-shaped slide 210, the U-shaped block 29 on the uppermost clamping frame 22 continues to move upward to pull the uppermost T-shaped slide 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 in sequence. In this way, the roasting furnace has the function of separating upper and lower adjacent castings, can effectively separate upper and lower adjacent castings, avoid the stacking of each casting and the obstruction of the effective transfer of heat, ensure uniform heat distribution, and make the casting fully heated as a whole, thereby improving the roasting efficiency of the casting, shortening the roasting time, reducing the consumption of energy or fuel, and achieving energy-saving effects. Since the fixed clamping plate 222 and the movable clamping plate 23 are both 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.

[0030] After the casting is roasted, the electric screw 27 is first controlled to reverse to drive the nut 28 to move the uppermost clamping frame 22 downward. Under the action of gravity, the remaining clamping frames 22 also move downward, so that the castings after roasting can be stacked from bottom to top again for subsequent retrieval. Then the trolley 12 is moved out of the furnace body 11 to the left, thereby driving the casting and the clamping mechanism out of the furnace body 11. The telescopic rod 25 is then separated from the furnace body 11. Under the reset action of spring 1 26, the telescopic rod 25 is extended and reset. Under the reset action of spring 2 3, the movable splint 23 connected to it is pushed to move to the right, thereby driving the remaining movable splints 23 to move to the right synchronously through the cross bar 24, thereby loosening the casting for subsequent retrieval.

[0031] See also Figure 7 A waste heat recovery mechanism is provided on the top right side of the furnace body 11, and the waste heat recovery mechanism includes a storage cylinder 51 installed on the top right side of the furnace body 11, and 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 the delivery pipe 53, and the fan 52 is connected to the storage cylinder 51 through the delivery pipe 2 54. The storage cylinder 51 is connected to the furnace body 11 through the delivery pipe 3 55. An electric push rod 1 56 is installed on the rear side of the outer wall of the storage cylinder 51, and the push rod of the electric push rod 1 56 is connected to a blocking plate 57 located in the storage cylinder 51, which is used to seal the air outlet end of the delivery pipe 2 54 and the air inlet end of the delivery pipe 3 55.

[0032] Control fan 1 52 to operate, thereby transferring the hot air from furnace body 11 into storage tube 51 through chimney 18, delivery pipe 1 53, and delivery pipe 2 54. The hot air from storage tube 51 then flows back into furnace body 11 via delivery pipe 3 55, achieving heat recycling, further reducing energy or fuel consumption and improving overall energy conservation. Before raising and opening sealing door 14, control electric push rod 1 56 to drive blocking plate 57 forward to block the outlet of delivery pipe 2 54 and the inlet of delivery pipe 3 55, thereby storing the hot air in storage tube 51 and preventing the high-temperature gas from escaping to the outside. When the sealing door 14 is lowered and closed to prepare for the next round of roasting, the electric push rod 1 56 is controlled to drive the blocking plate 57 to move backward, thereby releasing the blockage of the gas outlet end of the delivery pipe 2 54 and the gas inlet end of the delivery pipe 3 55. At the same time, the fan 1 52 is controlled to work and the high-temperature gas stored in the storage cylinder 51 is injected into the furnace body 11 to achieve preheating, thereby effectively reducing energy or fuel consumption and improving roasting efficiency.

[0033] See also Figure 8 The trolley 12 is provided with a pushing mechanism for pushing the casting out from the inner side of the clamping frame 22. The pushing mechanism includes a guide rod 60 connected to the left side of the trolley 12. The guide rod 60 is slidably connected to two front and rear slides 61. The top of the trolley 12 is provided with a slide groove for guiding the slide 61 to move forward and backward. The top of the slide 61 is connected with five push plates 62 at intervals from left to right. Each push plate 62 is located between the left and right adjacent fixed splints 222 and movable splints 23, and the push plate 62 is close to the fixed splint 222 to avoid hindering the movable splint 23 from moving to clamp the casting. The trolley 12 is provided with a push plate 62 to push the two push plates 62 away from each other. The pushing assembly includes two front and rear sliding rods 63 slidably connected to the trolley 12. The two sliding rods 63 are located between the two slides 61. The right ends of the two sliding rods 63 are connected to inclined plates 64. The two inclined plates 64 are in contact with the two slides 61 respectively. Two front and rear electric push rods 2 65 are installed on the left outer wall of the trolley 12. The two electric push rods 2 65 are respectively connected to the two sliding rods 63. The electric push rod 2 65 will not enter the furnace body 11 to avoid the electric push rod 2 65 being affected by high temperature. A spring 3 66 is sleeved on the guide rod 60, and the two ends of the spring 3 66 are respectively connected to the two slides 61.

[0034] After the trolley 12 is removed from the furnace body 11, the second electric push rod 65 is controlled to drive the sliding rod 63 and the inclined plate 64 to move to the left. When the two inclined plates 64 move to the left, they push the two slide plates 61 away from each other, thereby causing the front and rear push plates 62 to move away from each other, pushing the casting out from the inside of the clamping frame 22 to facilitate subsequent removal. The two slide plates 61 move away from each other, stretching the third spring 66. The second electric push rod 65 is controlled to drive the sliding rod 63 and the inclined plate 64 to move to the right to reset. Under the reset action of the third spring 66, the two slide plates 61 can be pulled closer together, thereby driving the front and rear push plates 62 closer together.

[0035] See also Figure 9 A cooling mechanism is provided on the trolley 12, which includes two front and rear injection pipes 71 connected to the trolley 12, which are used to spray gas upward 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 injection pipe 71 through an air supply pipe 73.

[0036] When the trolley 12 is removed from the furnace body 11, the blower 2 72 is controlled to work to transport the external gas through the gas pipe 73 to the injection pipe 71. The injection pipe 71 then sprays the gas upward toward the casting to perform air cooling on the casting, thereby improving the cooling efficiency, shortening the cooling time, facilitating the subsequent removal operation, reducing the risk of burns, and improving overall safety.

Claims

1. An energy-saving roasting furnace, characterized in that: The invention comprises a trolley type roasting furnace (1), wherein a clamping mechanism for clamping a casting is provided on the top of a trolley (12) of the trolley type roasting furnace (1), wherein the clamping mechanism comprises a guide frame (21) connected to the top of the trolley (12) of the trolley type roasting furnace (1), a clamping frame (22) is provided on the guide frame (21) in a sliding manner at intervals along the vertical direction, a group of movable clamping plates (23) are slidably connected to both sides of the clamping frame (22), and each group of movable clamping plates (23) is connected to a cross bar (24), the cross bar (24) is slidably matched with the clamping frame (22), and a telescopic rod (25) is provided on the upper side of the clamping frame (22), and the telescopic rod (25) is fixedly connected to the clamping frame (22). The top of the outermost movable splint (23) of the two sets of movable splints (23) is connected to drive the two sets of movable splints (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 splint (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 provided with a driving component for driving the clamping frame (22) to move up and down, so that the upper and lower adjacent castings are separated.

2. The energy-saving roasting furnace according to claim 1, characterized in that: The driving assembly includes an electric screw (27) arranged on a trolley (12) of a trolley-type roasting furnace (1), the screw on the electric screw (27) is rotatably connected to the guide frame (21), the screw on the electric screw (27) passes through the clamping frame (22), a nut (28) is embedded in the uppermost clamping frame (22), the nut (28) is threadedly connected to the screw of the electric screw (27), and the bottoms of the remaining clamping frames (22) except the lowermost clamping frame (22) are connected to a group of U-shaped blocks (29), and a T-shaped slide bar (210) is slidably connected to the U-shaped block (29), and the T-shaped slide bar (210) is fixedly connected to the top of the clamping frame (22) below it.

3. The energy-saving roasting furnace according to claim 2, characterized in that: A waste heat recovery mechanism is provided on the top of the furnace body (11) of the trolley type roasting furnace (1), and the waste heat recovery mechanism includes a storage cylinder (51) installed on the top of the furnace body (11), a fan 1 (52) is installed on the outside of the storage cylinder (51), the fan 1 (52) is connected to the chimney (18) of the trolley type roasting furnace (1) through the delivery pipe 1 (53), the fan 1 (52) is connected to the storage cylinder (51) through the delivery pipe 2 (54), the storage cylinder (51) is connected to the furnace body (11) through the delivery pipe 3 (55), an electric push rod 1 (56) is installed on the outside of the storage cylinder (51), and the push rod of the electric push rod 1 (56) is connected to a blocking plate (57) located in the storage cylinder (51) for blocking the air outlet end of the delivery pipe 2 (54) and the air inlet end of the delivery pipe 3 (55).

4. The energy-saving roasting furnace according to claim 1, characterized in that: A spring 2 (3) is sleeved on the crossbar (24), one end of the spring 2 (3) is connected to the movable splint (23) adjacent thereto, and the other end of the spring 2 (3) is connected to the clamping frame (22).

5. The energy-saving roasting furnace according to claim 3, characterized in that: A trolley (12) of a trolley-type roasting furnace (1) is provided with an ejection mechanism for ejecting a casting from the inner side of a clamping frame (22), the ejection mechanism comprising two slides (61) arranged on the top of the trolley (12), a push plate (62) being connected to the top of the slide plate (61) at intervals, and a pushing assembly for pushing the two push plates (62) away from each other is provided on the trolley (12).

6. The energy-saving roasting furnace according to claim 5, 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 the two slide plates (61), the ends of the two sliding rods (63) are connected to inclined plates (64), the two inclined plates (64) are in contact with 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, and a spring (66) is connected between the two slide plates (61).

7. The energy-saving roasting furnace according to claim 6, characterized in that: A cooling mechanism is provided on the trolley (12) of the trolley-type roasting furnace (1). The cooling mechanism includes two air injection pipes (71) connected to the trolley (12) for spraying gas upward onto the casting. A second air blower (72) is installed at the bottom of the trolley (12). The second air blower (72) is connected to the air injection pipe (71) through an air supply pipe (73).

8. The energy-saving roasting furnace according to claim 1, characterized in that: Balls (4) are provided at intervals on the movable end of the telescopic rod (25) for reducing the friction between the telescopic rod (25) and the furnace body (11) of the trolley type roasting furnace (1).

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