Rapid collection and treatment device for volatile gas of precision casting mold shell

Abstract

The utility model provides a device for quickly collecting and processing volatile gas of a precision casting mould shell, which relates to the technical field of the device for quickly collecting and processing the volatile gas of the precision casting mould shell, and comprises a smoke hood exhaust pipeline support and a lifting frame, the mold shell containing sand box lifting device comprises a lifting frame, two sliding groove frames are arranged on the lifting frame, the inner walls of the two sliding groove frames are connected with the two ends of the lifting frame in a sliding mode respectively, hydraulic rods are fixedly connected to the inner walls of the sliding groove frames, and the output ends of the hydraulic rods are fixedly connected with one side of the lifting frame. According to the lifting device, the lifting frame is arranged, so that in the lifting process of the lifting device, the mold shell containing sand box is not prone to shaking on the lifting frame to cause deviation, the mold shell containing sand box can be accurately lifted to the position below the smoke suction hood to facilitate gas collection, treatment and processing, and the conditions that gas collection is incomplete and air is polluted due to long-time use are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of a device for quickly collecting and processing volatile gases from a precision casting mold shell, and in particular to a device for quickly collecting and processing volatile gases from a precision casting mold shell. Background Art

[0002] The gas collection and processing device is a commonly used adsorption and collection equipment in the process of high-temperature mold shell casting. It plays the role of effectively collecting volatile gases, smoke, particulate matter, oxides and other waste gases generated under high temperature.

[0003] After the high-temperature mold shell pouring process is completed, it will be placed in the mold shell placement sand box, and then placed on the lifting frame. The power electrical cabinet controls the start of the hydraulic rod to drive the lifting frame to slide upward in the inner wall of the slide frame to a certain position, and then the high-temperature mold shell is lifted to the bottom of the smoke extraction hood, and then the high-temperature bag pulse dust collector is started to adsorb the volatile gas, smoke, particulate matter, oxides and other waste gases generated by the high-temperature mold shell under high temperature into the suction duct through the smoke extraction hood, and then enter the interior of the high-temperature bag pulse dust collector for collection and treatment. The treated gas will be extracted through the fan. Since the mold shell placement sand box is directly placed on the lifting frame, when it is lifted and lowered, the lifting frame will shake under the action of inertia when it starts or stops moving, which will cause the placed mold shell placement sand box to shake and shift, and it cannot be accurately raised to the bottom of the smoke extraction hood, resulting in the inability to effectively collect and treat the gas on the high-temperature mold shell. Over time, the overflow of harmful gases may cause air pollution and increase occupational hazards. Utility Model Content

[0004] The utility model proposes a device for quickly collecting and treating volatile gases from precision casting mold shells to solve the problem that the mold shell sandbox is directly placed on a lifting frame. When the lifting frame is started or stopped, it will shake due to inertia, which will cause the mold shell sandbox to shake and shift, and cannot be accurately raised to the bottom of the smoke extraction hood, resulting in the inability to effectively collect and treat the gas on the high-temperature mold shell. Over time, the overflow of harmful gases may cause air pollution and increase occupational hazards.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for quickly collecting and processing volatile gases from a precision casting mold shell, comprising a smoke hood exhaust duct support and a lifting frame, wherein both sides of the inner wall of the smoke hood exhaust duct support are fixedly connected with a slide frame, the inner walls of the two slide frames are respectively slidably connected to the two ends of the lifting frame, the inner wall of the slide frame is fixedly connected with a hydraulic rod, the output end of the hydraulic rod is fixedly connected to one side of the lifting frame, a mold shell placing sand box is arranged on the top of the lifting frame, a suction duct is arranged on the top of the smoke hood exhaust duct support, a smoking hood is fixedly connected to the outer surface of the suction duct, a high-temperature bag pulse dust collector is fixedly connected to one end of the suction duct, a fan is arranged at the air outlet of the high-temperature bag pulse dust collector, and the top of the slide frame An upper limit block is fixedly connected to one side of the part, a power electrical cabinet is arranged on one side of the smoke hood exhaust duct bracket, a limit device is arranged on the top of the lifting frame, the limit device includes two limit frames and a connecting rod, auxiliary devices are symmetrically arranged on one side of both ends of the limit frames, a first rectangular groove is symmetrically opened on the top of the lifting frame, a plurality of card slots are opened on both sides of the lifting frame, the two ends of the two limit frames are respectively slidably connected to the inner walls of the two ends of the two first rectangular grooves, a second rectangular groove is opened on both sides of the limit frame, a spring is fixedly connected to one side of the inner wall of the second rectangular groove, one end of the spring is fixedly connected to a card block, one end of the card block is slidably connected to the inner wall of the second rectangular groove, and the size and shape of the outer surface of one end of the card block are adapted to the size and shape of the inner wall of the card slot.

[0006] The effect achieved by the above components is: by setting a limit device, after the high-temperature mold shell pouring process is completed, it will be placed in the mold shell placement sandbox, and then placed on the lifting frame, first manually hold the card block and pull it upward in the second rectangular groove to a certain position, so that its spring is squeezed and contracted, and then push the limit frame to slide its two ends to one end in the two second rectangular grooves to a certain position, and then abut one side of it against one side of the mold shell placement sandbox, then release the card block, and one end of the card block will be stuck in the corresponding card slot under the resetting action of the spring to fix it in a limited position, and the same operation is performed on the other end, sliding the same distance to place the mold shell in the sandbox. The other side is limited and fixed, so that during the lifting process, the sandbox placed on the mold shell will not shake and shift on the lifting frame, and can be accurately lifted to the bottom of the smoke exhaust hood to facilitate the collection and processing of the gas. Then, the hydraulic rod is started by the power electrical cabinet to drive the lifting frame to slide upward to a certain position on the inner wall of the slide frame, and then the high-temperature mold shell is lifted to the bottom of the smoke exhaust hood, and then the high-temperature bag pulse dust collector is started to absorb the volatile gas, smoke, particulate matter, oxides and other waste gases generated by the high-temperature mold shell under high temperature into the suction duct through the smoke exhaust hood, and then enter the interior of the high-temperature bag pulse dust collector for collection and treatment, and the treated gas will be extracted through the fan.

[0007] Preferably, a first telescopic rod is fixedly connected to one side of the inner wall of the second rectangular groove, one end of the first telescopic rod is fixedly connected to one side of the clamping block, and the outer surface of the first telescopic rod is sleeved and connected to the inner wall of the spring.

[0008] The effect achieved by the above components is: by setting the first telescopic rod, the inner wall of the spring can be supported and reinforced, so that it is not easy to bend and deform to cause damage when compressed and stretched, thereby improving the service life of the spring.

[0009] Preferably, both ends of the connecting rod are fixedly connected to one side of the two clamping blocks respectively, and the size and shape of the inner wall of the connecting rod are matched with the size and shape of the outer surface of the limiting frame.

[0010] The effect achieved by the above components is that by setting a connecting rod, the two card blocks can be connected, which is convenient for simultaneous operation and pulling, and the operation steps are simplified, which is convenient for pulling.

[0011] Preferably, a handle block is fixedly connected to one side of the limiting frame, and a cross section of the handle block is U-shaped.

[0012] The effect achieved by the above components is that by providing the handle block, the contact area of ​​one side of the limit frame can be increased, making it easier to manually hold and pull it.

[0013] Preferably, a plurality of anti-sliding blocks are fixedly connected to one side of the limiting frame, and the anti-sliding blocks are arranged on a side of the mold shell where the sandbox is placed.

[0014] The effect achieved by the above components is: by setting the anti-sliding block, the contact friction force on one side of the limit frame can be increased, so that when it abuts against the mold shell placed on the sandbox, the limit is more firm and stable.

[0015] Preferably, the auxiliary device comprises a screw hole block, one side of which is fixedly connected to one side of the limiting frame, an inner wall of the screw hole block is threadedly connected to a threaded rod, and one end of the threaded rod is rotatably connected to a limiting plate.

[0016] The effect achieved by the above-mentioned components is: by setting an auxiliary device, when the limiting device fixes the two sides of the mold shell sand box, the two threaded rods can be manually held and rotated to a certain position in the inner walls of the two screw hole blocks, thereby driving the two limiting plates to move the same distance in opposite directions at the same time, squeezing the other two sides of the mold shell sand box to return it to the limit position, thereby ensuring that the mold shell sand box can be accurately placed in the middle position of the lifting frame, which is convenient for its precise lifting and lowering in the later stage and convenient for gas collection and processing.

[0017] Preferably, one end of the threaded rod is fixedly connected to a plurality of operating blocks, and the plurality of operating blocks are arranged at equal distances.

[0018] The effect achieved by the above components is that by setting the operating block, the contact area of ​​one end of the threaded rod can be increased, making it easier to manually rotate it.

[0019] Preferably, a second telescopic rod is fixedly connected to one side of the limiting plate, and one end of the second telescopic rod is fixedly connected to one side of the screw hole block.

[0020] The effect achieved by the above components is: by setting the second telescopic rod, the limit plate can be placed to rotate with the rotation of the threaded rod, and its movement direction is limited and fixed, thereby reducing the wear of the limit plate and increasing its service life.

[0021] Compared with the prior art, the advantages and positive effects of the utility model are:

[0022] In the utility model, by setting a limiting device, after the high-temperature mold shell pouring process is completed, it will be placed in the mold shell placement sandbox, and then placed on the lifting frame, first manually hold the card block and pull it upward in the second rectangular groove to a certain position, so that its spring is squeezed and contracted, and then push the limiting frame to slide its two ends to one end in the two second rectangular grooves to a certain position, and then abut one side of the card block against one side of the mold shell placement sandbox, then release the card block, and one end of the card block will be stuck in the corresponding card slot under the resetting action of the spring, fixing it in a limited position, and the same operation is performed on the other end, sliding the same distance, and placing the mold shell on the other side of the sandbox. The mold shell is fixed in a limited position so that during the lifting process, the sandbox placed on the mold shell will not shake or shift on the lifting frame, and can be accurately lifted to the bottom of the smoke exhaust hood to facilitate the collection and processing of the gas. Then, the hydraulic rod is started by the power electrical cabinet to drive the lifting frame to slide upward to a certain position on the inner wall of the slide frame, and then the high-temperature mold shell is lifted to the bottom of the smoke exhaust hood. Then, the high-temperature bag pulse dust collector is started to absorb the volatile gas, smoke, particulate matter, oxides and other waste gases generated by the high-temperature mold shell under high temperature into the suction duct through the smoke exhaust hood, and then enter the interior of the high-temperature bag pulse dust collector for collection and treatment, and the treated gas will be extracted through the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 for Figure 1 A three-dimensional schematic diagram of the structure of the middle part;

[0025] Figure 3 for Figure 2 A three-dimensional schematic diagram of the structure of the middle part;

[0026] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the middle limit device;

[0027] Figure 5 for Figure 4 A three-dimensional schematic diagram of the structure of the middle part;

[0028] Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the other side of the middle limit frame.

[0029] Legend: 1. Smoke hood exhaust duct bracket; 2. Limit device; 3. Auxiliary device; 4. Slide rack; 5. Hydraulic rod; 6. Lifting rack; 7. Mold shell sandbox; 8. Suction duct; 9. Smoke hood; 10. High-temperature bag pulse dust collector; 11. Fan; 12. Upper limit block; 13. Power electrical cabinet; 21. First rectangular groove; 22. Card slot; 23. Limit rack; 24. Second rectangular groove; 25. Spring; 26. Card block; 27. First telescopic rod; 28. Connecting rod; 29. ​​Handle block; 210. Anti-sliding block; 31. Screw hole block; 32. Threaded rod; 33. Limit plate; 34. Operating block; 35. Second telescopic rod. DETAILED DESCRIPTION

[0030] Embodiment 1, as Figure 1-6As shown, a device for quickly collecting and treating volatile gases from a precision casting mold shell comprises a smoke hood exhaust duct support 1 and a lifting frame 6. Both sides of the inner wall of the smoke hood exhaust duct support 1 are fixedly connected with slide frames 4. The inner walls of the two slide frames 4 are respectively slidably connected to the two ends of the lifting frame 6. The inner wall of the slide frame 4 is fixedly connected with a hydraulic rod 5. The output end of the hydraulic rod 5 is fixedly connected to one side of the lifting frame 6. A mold shell placing sand box 7 is arranged on the top of the lifting frame 6. An air suction duct 8 is arranged on the top of the smoke hood exhaust duct support 1. A smoking hood 9 is fixedly connected to the outer surface of the air suction duct 8. A high-temperature bag pulse dust collector 10 is fixedly connected to one end of the air suction duct 8. A fan 11 is arranged at the air outlet of the high-temperature bag pulse dust collector 10. An upper limit block 12 is fixedly connected to one side of the top of the slide frame 4. A power electrical cabinet 13 is provided on one side of the pipe support 1, and a limiting device 2 is provided on the top of the lifting frame 6. The limiting device 2 includes two limiting frames 23 and a connecting rod 28. Auxiliary devices 3 are symmetrically provided on one side of both ends of the limiting frames 23. A first rectangular groove 21 is symmetrically provided on the top of the lifting frame 6, and a plurality of card slots 22 are provided on both sides of the lifting frame 6. The two ends of the two limiting frames 23 are respectively slidably connected to the inner walls of the two ends of the two first rectangular grooves 21. A second rectangular groove 24 is provided on both sides of the limiting frames 23. A spring 25 is fixedly connected to one side of the inner wall of the second rectangular groove 24, and one end of the spring 25 is fixedly connected to a card block 26. One end of the card block 26 is slidably connected to the inner wall of the second rectangular groove 24, and the size and shape of the outer surface of one end of the card block 26 are adapted to the size and shape of the inner wall of the card slot 22. After the high-temperature mold casting process is completed, it will be placed in the mold sandbox 7, and then placed on the lifting frame 6. First, manually hold the block 26 and pull it upward in the second rectangular groove 24 to a certain position, so that its spring 25 is squeezed and contracted, and then push the limit frame 23 to slide its two ends to one end in the two second rectangular grooves 24 to a certain position, and then one side of it will be against one side of the mold sandbox 7. At this time, release the block 26, and one end of the block 26 will be stuck in the corresponding slot 22 under the reset action of the spring 25, fixing it in a limited position. Similarly, the other end is operated in the same way, sliding the same distance to limit and fix the other side of the mold sandbox 7. In this way, during the lifting process, the mold shell placing sandbox 7 will not shake and deviate on the lifting frame 6, and can be accurately lifted to the bottom of the smoking hood 9 to facilitate the collection and processing of the gas. Then, the power electrical cabinet 13 controls the hydraulic rod 5 to start the lifting frame 6 to slide upward to a certain position in the inner wall of the slide frame 4, and then the high-temperature mold shell is lifted to the bottom of the smoking hood 9, and then the high-temperature bag pulse dust collector 10 is started to absorb the volatile gas, smoke, particulate matter, oxides and other waste gases generated by the high-temperature mold shell under high temperature into the suction duct 8 through the smoking hood 9, and then enter the interior of the high-temperature bag pulse dust collector 10 for collection and processing, and the treated gas will be extracted through the fan 11.

[0031] Reference Figure 1-6 As shown, the present embodiment discloses that a first telescopic rod 27 is fixedly connected to one side of the inner wall of the second rectangular groove 24, one end of the first telescopic rod 27 is fixedly connected to one side of the block 26, and the outer surface of the first telescopic rod 27 is sleeved and connected to the inner wall of the spring 25. By providing the first telescopic rod 27, the inner wall of the spring 25 can be supported and reinforced, so that it is not easy to bend and deform when compressed and stretched to cause damage, thereby improving the service life of the spring 25. The two ends of the connecting rod 28 are respectively fixedly connected to one side of the two blocks 26, and the size and shape of the inner wall of the connecting rod 28 are adapted to the size and shape of the outer surface of the limit frame 23. By providing the connecting rod 28, the two blocks 26 can be connected, which is convenient for simultaneous operation and pulling, and the operation steps are simplified, which is convenient for pulling.

[0032] Reference Figure 1-6 As shown, the present embodiment discloses that a handle block 29 is fixedly connected to one side of the limit frame 23, and the cross section of the handle block 29 is in a U shape. By providing the handle block 29, the contact area of ​​one side of the limit frame 23 can be increased, so that it is convenient to manually hold and pull it. A plurality of anti-sliding blocks 210 are fixedly connected to one side of the limit frame 23, and the anti-sliding blocks 210 are arranged on the side close to the mold shell for placing the sandbox 7. By providing the anti-sliding blocks 210, the contact friction force of one side of the limit frame 23 can be increased, so that when it abuts against the mold shell for placing the sandbox 7, the limit is more firm and stable.

[0033] Reference Figure 1-6 As shown, the present embodiment discloses that the auxiliary device 3 includes a screw hole block 31, one side of the screw hole block 31 is fixedly connected to one side of the limiting frame 23, the inner wall of the screw hole block 31 is threadedly connected with a threaded rod 32, and one end of the threaded rod 32 is rotatably connected to a limiting plate 33. When the limiting device 2 limits and fixes the two sides of the mold shell placing sand box 7, the two threaded rods 32 can be manually held and rotated to a certain position in the inner walls of the two screw hole blocks 31, and then the two limiting plates 33 are driven to move the same distance in opposite directions at the same time, and the other two sides of the mold shell placing sand box 7 are squeezed to return to the limit position, so that the mold shell placing sand box 7 can be accurately placed in the middle position of the lifting frame 6, which is convenient for accurate lifting and lowering in the later stage, and is convenient for gas collection and processing.

[0034] Reference Figure 1-6As shown, the present embodiment discloses that one end of the threaded rod 32 is fixedly connected to a plurality of operating blocks 34, and the plurality of operating blocks 34 are arranged at equal distances. By providing the operating block 34, the contact area of ​​one end of the threaded rod 32 can be increased, and manual rotation operation thereof can be facilitated. A second telescopic rod 35 is fixedly connected to one side of the limit plate 33, and one end of the second telescopic rod 35 is fixedly connected to one side of the screw hole block 31. By providing the second telescopic rod 35, the limit plate 33 can be placed so as to rotate with the rotation of the threaded rod 32, and its movement direction is limited and fixed, thereby reducing the wear of the limit plate 33 and increasing its service life.

[0035] Working principle: after the high-temperature mold casting process is completed, it will be placed in the mold sandbox 7, and then placed on the lifting frame 6. First, manually hold the connecting rod 28 and pull it upward, driving the two blocks 26 to be pulled upward to a certain position in the two second rectangular grooves 24, so that the springs 25 are squeezed and contracted, and then push the limit frame 23 to slide its two ends to one end in the two second rectangular grooves 24 to a certain position, and then one side of it will be abutted against one side of the mold sandbox 7. At this time, release the block 26, and one end of the block 26 will be stuck in the corresponding slot 22 under the reset action of the spring 25, fixing it in a limited position. Similarly, the other end is operated in the same way, sliding the same distance to limit and fix the other side of the mold sandbox 7. During the lifting process, the mold shell placed in the sandbox 7 will not shake and deviate on the lifting frame 6, and can be accurately lifted to the bottom of the smoke extraction hood 9 to facilitate the collection and processing of the gas, thereby avoiding incomplete gas collection over time and the occurrence of air pollution. Then, the power electrical cabinet 13 controls the start of the hydraulic rod 5 to drive the lifting frame 6 to slide upward to a certain position in the inner wall of the slide frame 4, and then the high-temperature mold shell is lifted to the bottom of the smoke extraction hood 9, and then the high-temperature bag pulse dust collector 10 is started to absorb the volatile gas, smoke, particulate matter, oxides and other waste gases generated by the high-temperature mold shell under high temperature into the suction duct 8 through the smoke extraction hood 9, and then enter the interior of the high-temperature bag pulse dust collector 10 for collection and treatment, and the treated gas will be extracted through the fan 11.

[0036] When the limiting device 2 limits and fixes the two sides of the mold shell sand box 7, you can manually hold the operating blocks 34 on the two threaded rods 32 and rotate them to a certain position in the inner walls of the two screw hole blocks 31. Under the limiting action of the second telescopic rod 35, the two limiting plates 33 can be driven to move the same distance in relative directions at the same time, and the other two sides of the mold shell sand box 7 can be squeezed to return to the limit position. In this way, it can be ensured that the mold shell sand box 7 can be accurately placed in the middle position of the lifting frame 6, which is convenient for its precise lifting and lowering in the later stage and convenient for gas collection and processing.

Claims

1. A device for quickly collecting and treating volatile gases from a precision casting mold shell, comprising a fume hood exhaust pipe support (1) and a lifting frame (6), characterized in that: Both sides of the inner wall of the smoke hood exhaust duct support (1) are fixedly connected with a slide frame (4), the inner walls of the two slide frames (4) are slidably connected to the two ends of the lifting frame (6) respectively, the inner wall of the slide frame (4) is fixedly connected with a hydraulic rod (5), the output end of the hydraulic rod (5) is fixedly connected to one side of the lifting frame (6), the top of the lifting frame (6) is provided with a mold shell placement sand box (7), the top of the smoke hood exhaust duct support (1) is provided with an air suction duct (8), the outer surface of the air suction duct (8) is fixedly connected with a smoking hood (9), one end of the air suction duct (8) is fixedly connected with a high-temperature bag pulse dust collector (10), and a fan (11) is provided at the air outlet of the high-temperature bag pulse dust collector (10), one side of the top of the slide frame (4) is fixedly connected with an upper limit block (12), one side of the smoke hood exhaust duct support (1) is provided with a power electrical cabinet (13), the lifting frame (6) is provided with a power electrical cabinet (13), and the lifting frame (6) is provided with a power electrical cabinet (13). A limiting device (2) is arranged at the top of the lowering frame (6), the limiting device (2) comprising two limiting frames (23) and a connecting rod (28), auxiliary devices (3) are symmetrically arranged on one side of both ends of the limiting frames (23), a first rectangular groove (21) is symmetrically opened at the top of the lifting frame (6), a plurality of clamping grooves (22) are opened on both sides of the lifting frame (6), the two ends of the two limiting frames (23) are respectively slidably connected to the inner walls of the two ends of the two first rectangular grooves (21), the two ends of the limiting frames (23) are respectively slidably connected to the inner walls of the two first rectangular grooves (21), the two sides of the limiting frames (23) are opened on both sides, a second rectangular groove (24) is fixedly connected to one side of the inner wall of the second rectangular groove (24), one end of the spring (25) is fixedly connected to a clamping block (26), one end of the clamping block (26) is slidably connected to the inner wall of the second rectangular groove (24), and the size and shape of the outer surface of one end of the clamping block (26) are adapted to the size and shape of the inner wall of the clamping groove (22).

2. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 1 is characterized in that: A first telescopic rod (27) is fixedly connected to one side of the inner wall of the second rectangular groove (24), one end of the first telescopic rod (27) is fixedly connected to one side of the clamping block (26), and the outer surface of the first telescopic rod (27) is sleeved and connected to the inner wall of the spring (25).

3. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 1 is characterized in that: The two ends of the connecting rod (28) are respectively fixedly connected to one side of the two clamping blocks (26), and the size and shape of the inner wall of the connecting rod (28) are matched with the size and shape of the outer surface of the limiting frame (23).

4. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 1, characterized in that: A handle block (29) is fixedly connected to one side of the limiting frame (23), and the cross section of the handle block (29) is in a U shape.

5. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 1 is characterized in that: A plurality of anti-sliding blocks (210) are fixedly connected to one side of the limiting frame (23), and the anti-sliding blocks (210) are arranged on a side close to the mold shell where the sandbox (7) is placed.

6. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 1, characterized in that: The auxiliary device (3) comprises a screw hole block (31), one side of the screw hole block (31) is fixedly connected to one side of the limit frame (23), the inner wall of the screw hole block (31) is threadedly connected to a threaded rod (32), and one end of the threaded rod (32) is rotatably connected to the limit plate (33).

7. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 6, characterized in that: One end of the threaded rod (32) is fixedly connected to a plurality of operating blocks (34), and the plurality of operating blocks (34) are arranged at equal distances.

8. The device for quickly collecting and treating volatile gases from precision casting mold shells according to claim 6, characterized in that: A second telescopic rod (35) is fixedly connected to one side of the limiting plate (33), and one end of the second telescopic rod (35) is fixedly connected to one side of the screw hole block (31).

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