Anti-falling conveying mechanism for stuffing sand product

Abstract

The invention relates to the technical field of conveying mechanisms, in particular to an anti-falling conveying mechanism for stuffing sand products, which comprises a conveying rack, a bending roll shaft and a conveying belt, the bending roll shaft and the conveying belt are arranged on the conveying rack, and through the support of the bending roll shaft, the two sides of the conveying belt are folded upwards to form a U shape; the anti-falling conveying mechanism further comprises an anti-falling shielding cover used for shielding the stuffing sand and preventing the stuffing sand conveyed on the conveying belt from falling. Through the arrangement of the anti-falling shade, the stuffing sand can be prevented from falling off in the process of filling the stuffing sand above the conveying belt and in the conveying process; and moreover, airflow can enter the overlapped contact surfaces of the conveying belt and the anti-falling shade, an air film is formed between the contact surfaces of the conveying belt and the anti-falling shade, and the contact abrasion between the conveying belt and the anti-falling shade is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of conveying mechanisms, in particular to an anti-dropping conveying mechanism for drainage sand products. Background Art

[0002] Drainage sand is a key refractory material used in the bottom nozzle of the ladle in steel smelting. Its main function is to ensure that molten steel can flow out automatically and smoothly during the pouring process, thereby improving production efficiency and safety. It is usually mixed with a variety of high-temperature resistant mineral materials, and common ingredients include forsterite, fused magnesia, chromium ore, quartz sand, etc. In large-scale industrial production, multiple groups of stirring kettles are usually set up for simultaneous processing. After the processing is completed, the multiple groups of stirring kettles set side by side discharge the drainage sand onto the conveyor belt for unified transportation. In the traditional conveyor belt mechanism, the drainage sand is easy to fall and spill when the drainage sand is discharged onto the conveyor belt and during transportation. Since the conveyor belt is in operation, the traditional method of directly setting a mask for shielding causes relative movement between the mask and the conveyor belt, which is easy to wear and cause great loss to the conveyor belt. Summary of the invention

[0003] The object of the present invention is to provide an anti-drop conveying mechanism for drainage sand products to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: an anti-drop conveying mechanism for drainage sand products, comprising a conveying frame, a bending roller shaft arranged on the conveying frame, and a conveying belt, wherein the two sides of the conveying belt are folded upward to form a U shape through the support of the bending roller shaft; the anti-drop conveying mechanism also includes: An anti-drop shield, which is used to shield the drainage sand to prevent the drainage sand transported on the conveyor belt from falling. Both sides of the anti-drop shield are bent downward and overlap with the two sides of the conveyor belt that are folded upward; The airflow slots are provided on the two side surfaces of the anti-drop shield that are bent downwards, and the airflow slots are arranged parallel to the length direction of the anti-drop shield. Positive pressure airflow is sprayed through the airflow slots, so that the airflow intervenes between the contact surface of the conveyor belt and the anti-drop shield.

[0005] The anti-drop shield is provided with a flow balancing tube, which is parallel to and corresponds to the air flow slot and is in communication with each other; A negative pressure top chamber is arranged on the upper part of the anti-drop shield, a mesh bottom plate is arranged on the bottom of the negative pressure top chamber, a filter layer is attached to the lower surface of the mesh bottom plate, the negative pressure top chamber is connected with the inner cavity of the anti-drop shield, and the gas entering the negative pressure top chamber from the anti-drop shield can be filtered through the filter layer; An air pump module is fixedly arranged on the mesh bottom plate, and the air pump module can drive the mesh bottom plate to resonate. The air pump module extracts gas in the negative pressure top chamber and inputs it into the flow equalizing pipe.

[0006] The air outlet end of the air pump module is connected with a corrugated connecting pipe, a top pipe is connected with the corrugated connecting pipe, a diversion pipe is connected with the top pipe, a side wall air pipe is attached to the surface of the anti-drop shield, and the diversion pipe is connected with the flow equalizing pipe through the side wall air pipe.

[0007] An extension shaft is coaxially fixedly arranged on the motor shaft of the air pump module, and a track outer frame is fixedly arranged on the surface of the extension shaft; A counterweight block is arranged outside the extension shaft, a track side groove is opened on the surface of the counterweight block, and the track outer frame is limitedly arranged in the track side groove, so that the counterweight block slides along the radial limit of the extension shaft.

[0008] An adjusting screw rod is inserted in the counterweight block, and the adjusting screw rod is spirally matched with the counterweight block, and the movement of the counterweight block is controlled by rotating the adjusting screw rod.

[0009] A control shaft cavity is provided in the extension shaft, and a gear plate and a rack plate are arranged in the control shaft cavity. The gear plate is coaxially fixed with the adjusting screw rod, and the gear plate and the rack plate are meshed with each other. When the rack plate moves along the axial direction of the extension shaft, the gear plate rotates.

[0010] A driven cavity is fixedly provided at the end of the extension shaft, a driving piston is provided in the driven cavity, the driven cavity is in sealing contact with the driving piston, a piston shaft is fixedly provided on the driving piston, and one end of the piston shaft is fixedly mounted on the rack plate; A pressure equalizing hole is formed through the surface of the driven cavity tube on one side facing the extension shaft, and an alternating rotating tube is coaxially arranged on the side of the driven cavity tube away from the extension shaft. A sealing rotating sleeve is provided on the surface sealing cover of the alternating rotating tube, and a stabilizing frame is fixedly arranged on the outside of the sealing rotating sleeve. The sealing rotating sleeve is fixedly installed with the air pump module through the stabilizing frame, and a medium pipeline is connected to the sealing rotating sleeve, and the medium pipeline is connected to the inner cavity of the driven cavity tube through the alternating rotating tube.

[0011] An annular pressure-sensitive ring is provided on the surface of the negative pressure top chamber, a floating plug disc is provided in the annular pressure-sensitive ring in airtight contact, and a supporting spring for applying an upward supporting elastic force to the floating plug disc is provided below the floating plug disc.

[0012] A center tube is provided at the center position of the floating plug disc, a center piston is provided in the center tube, the center piston is in sealing contact with the center tube, a straight shaft tube is fixedly provided at the lower part of the center piston, the lower end of the straight shaft tube is connected with the medium pipeline, and the upper end of the straight shaft tube is connected with the upper surface of the center piston, so that when the center piston moves upward relative to the center tube, the medium in the center tube can enter the medium pipeline through the straight shaft tube.

[0013] A roller support is fixedly arranged on the conveyor frame, the bending roller is rotatably arranged on the roller support, the bending roller is supported and limited by the roller support, and driving belt rollers are respectively arranged at both ends of the conveyor frame, and the conveyor belt is supported and tensioned by the driving belt rollers; The upper part of the anti-drop shield is connected to a product input shield, and after the drainage sand is processed, it is input to the top of the conveyor belt through the product input shield for transportation.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The anti-drop conveying mechanism of the present invention can prevent the drainage sand from falling during the process of being filled onto the conveyor belt and during the conveying process by means of the provided anti-drop shield; and the provided airflow slots can allow the airflow to intervene between the overlapping contact surfaces of the conveyor belt and the anti-drop shield, forming an air film between the contact surfaces of the conveyor belt and the anti-drop shield, thereby reducing the contact wear between the two, reducing the friction force, and being more energy-efficient; at the same time, since the contact surfaces between the conveyor belt and the anti-drop shield are in a positive pressure state, the entry of drainage sand and dust can be suppressed, which not only enhances the shielding and sealing effect on the drainage sand, but also reduces the wear aggravated by the intervention of the drainage sand between the contact surfaces.

[0015] Through the coordination of the negative pressure top bin, air pump module and mesh bottom plate and other structures, the interior of the anti-drop shield can be kept in a negative pressure state while supplying air to the air flow slots, thereby reducing dust escape. At the same time, the vibration of the air pump module is used to drive the mesh bottom plate and the filter layer to vibrate, making the filter layer less likely to be clogged and reducing the frequency of maintenance.

[0016] Through the coordination of the counterweight block, driven cavity tube, annular pressure-sensitive ring and other structures, the air pump module can automatically adjust the amplitude according to the blockage of the filter layer. When the blockage of the filter layer is more serious, the negative pressure inside the negative pressure top chamber will be greater. At this time, the amplitude of the vibration caused by the air pump module will be increased through the automatic adjustment of the structure, thereby increasing the vibration cleaning effect on the filter layer. Therefore, when the blockage degree of the filter layer is low, the amplitude of the vibration caused by the air pump module can be lower, thereby delaying the metal fatigue rate of structures such as the mesh bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is the front view of the overall structure of the present invention.

[0019] Figure 3 It is a three-dimensional cutaway schematic diagram of the negative pressure top bin of the present invention.

[0020] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0021] Figure 5 It is a three-dimensional cutaway schematic diagram of the negative pressure top bin of the present invention from another angle.

[0022] Figure 6 for Figure 5 Enlarged schematic diagram of area B in the middle.

[0023] Figure 7 It is a half-section view of the present invention.

[0024] Figure 8 for Figure 7 Enlarged schematic diagram of area C in the middle.

[0025] Fig. 9 for Figure 8 Enlarged schematic diagram of area D in the middle.

[0026] In the figure: 1, conveyor frame; 2, bending roller; 3, conveyor belt; 4, anti-drop shield; 5, air flow slot; 501, flow equalizing pipe; 502, negative pressure top bin; 503, mesh bottom plate; 504, filter layer; 505, air pump module; 506, corrugated connecting pipe; 507, top pipe; 508, diversion pipeline; 509, side wall air pipe; 510, extension shaft; 511, track outer frame; 512, counterweight block; 513, track side groove; 514, adjustment screw; 515, control shaft cavity; 516, gear plate; 517, rack plate; 518, driven cavity tube; 519, driving piston; 520, piston shaft; 521, pressure equalizing hole; 522, alternating rotating tube; 523, sealing rotating sleeve; 524, stabilizing frame; 525, medium pipeline; 526, annular pressure-sensitive ring; 527, floating plug plate; 528, supporting spring; 529, center tube; 530, center piston; 531, straight shaft tube; 101, roller bracket; 102, driving belt roller; 401, product input cover. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figures 1 to 9 The present invention provides a technical solution: an anti-drop conveying mechanism for drainage sand products, comprising a conveying frame 1, a bending roller shaft 2 arranged on the conveying frame 1, and a conveying belt 3. Through the support of the bending roller shaft 2, both sides of the conveying belt 3 are folded upward to form a U shape, such as Figure 1 As shown in , the bending roller 2 includes a horizontally arranged roller and an inclinedly arranged roller, and the two sides of the conveyor belt 3 are folded upward by the inclined roller; The anti-drop conveying mechanism also includes: an anti-drop shield 4, which is used to shield the drainage sand to prevent the drainage sand transported on the conveyor belt 3 from falling. The two sides of the anti-drop shield 4 are bent downward and overlap with the two sides of the conveyor belt 3 that are folded upward. Figure 4 As shown in , the two sides of the anti-drop shield 4 are pressed above the two sides of the conveyor belt 3 that are folded upward; The airflow slot 5 is provided on both side surfaces of the anti-drop shield 4 which are bent downwards. The airflow slot 5 is arranged parallel to the length direction of the anti-drop shield 4. Positive pressure airflow is sprayed through the airflow slot 5 so that the airflow intervenes between the contact surface of the conveyor belt 3 and the anti-drop shield 4.

[0029] A flow equalizing tube 501 is arranged on the anti-drop shield 4, and the flow equalizing tube 501 corresponds to the air flow slot 5 in parallel and is interconnected. Through the arrangement of the flow equalizing tube 501, the air flow slot 5 can be evenly exhausted; a negative pressure top bin 502 is arranged on the upper part of the anti-drop shield 4, and a mesh bottom plate 503 is arranged on the bottom of the negative pressure top bin 502, and a filter layer 504 is attached to the lower surface of the mesh bottom plate 503. The negative pressure top bin 502 is connected with the inner cavity of the anti-drop shield 4, and the gas entering the negative pressure top bin 502 from the anti-drop shield 4 can be filtered through the filter layer 504; an air pump module 505 is fixedly arranged on the mesh bottom plate 503, and the air pump module 505 includes a pump body part and a motor part. The air pump module 505 can drive the mesh bottom plate 503 to resonate, and the air pump module 505 extracts the gas in the negative pressure top bin 502 and inputs it into the flow equalizing tube 501.

[0030] The air outlet of the air pump module 505 is connected with a bellows connection pipe 506, and the bellows connection pipe 506 enables the air pump module 505 to vibrate relative to the negative pressure top chamber 502. The bellows connection pipe 506 is connected with a top pipe 507, and the top pipe 507 is connected with a shunt pipe 508. The surface of the anti-drop shield 4 is attached with a side wall air pipe 509, and the shunt pipe 508 is connected with the flow equalizing pipe 501 through the side wall air pipe 509.

[0031] like Figure 6 and Fig. 9As shown in the figure, an extension shaft 510 is coaxially fixed on the motor shaft of the air pump module 505, and a track outer frame 511 is fixedly arranged on the surface of the extension shaft 510; a counterweight block 512 is arranged on the outside of the extension shaft 510, and a track side groove 513 is opened on the surface of the counterweight block 512, and the track outer frame 511 is limitedly arranged in the track side groove 513, so that the counterweight block 512 can slide along the radial limit of the extension shaft 510.

[0032] An adjusting screw rod 514 is inserted into the counterweight block 512 . The adjusting screw rod 514 is screw-matched with the counterweight block 512 . The movement of the counterweight block 512 is controlled by the rotation of the adjusting screw rod 514 .

[0033] A control shaft cavity 515 is opened in the extension shaft 510, and a gear plate 516 and a rack plate 517 are arranged in the control shaft cavity 515. The gear plate 516 is coaxially fixed with the adjusting screw 514, and the gear plate 516 and the rack plate 517 are meshed with each other. When the rack plate 517 moves along the axial direction of the extension shaft 510, the gear plate 516 rotates.

[0034] A driven cavity 518 is fixedly disposed at the end of the extension shaft 510, a driving piston 519 is disposed in the driven cavity 518, the driven cavity 518 and the driving piston 519 are in sealed contact, a piston shaft 520 is fixedly disposed on the driving piston 519, and one end of the piston shaft 520 is fixedly mounted on the rack plate 517; A pressure equalizing hole 521 is formed on the surface of the driven cavity tube 518 facing the extension shaft 510. An alternating rotating tube 522 is coaxially arranged on the side of the driven cavity tube 518 away from the extension shaft 510. A sealing rotating sleeve 523 is provided on the surface sealing cover of the alternating rotating tube 522. Fig. 9 As shown in the figure, the interactive rotating tube 522 and the sealing rotating sleeve 523 can rotate relative to each other, and the sealing rotating sleeve 523 and the interactive rotating tube 522 maintain sealed communication, a stabilizing frame 524 is fixedly provided on the outside of the sealing rotating sleeve 523, and the sealing rotating sleeve 523 is fixedly installed with the air pump module 505 through the stabilizing frame 524, and a medium pipeline 525 is connected to the sealing rotating sleeve 523, and the medium pipeline 525 is connected to the inner cavity of the driven cavity tube 518 through the interactive rotating tube 522.

[0035] An annular pressure-sensitive ring 526 is provided on the surface of the negative pressure top chamber 502 , a floating plug disc 527 is provided in airtight contact with the annular pressure-sensitive ring 526 , and a supporting spring 528 is provided below the floating plug disc 527 to apply an upward supporting elastic force to the floating plug disc 527 .

[0036] A central tube 529 is provided at the center of the floating plug disc 527. A central piston 530 is provided in the central tube 529. The central piston 530 is in sealing contact with the central tube 529. A straight shaft tube 531 is fixedly provided at the lower part of the central piston 530. Figure 8 As shown in , the straight shaft tube 531 is fixedly installed on the inner wall surface of the annular pressure-sensitive ring 526 through a bracket, thereby ensuring that the height of the central piston 530 remains unchanged when the floating plug disc 527 moves up and down.

[0037] The lower end of the straight shaft tube 531 is connected to the medium pipeline 525, and the upper end of the straight shaft tube 531 is connected to the upper surface of the center piston 530, so that when the center piston 530 moves upward relative to the center tube 529, the medium in the center tube 529 can enter the medium pipeline 525 through the straight shaft tube 531. The above medium can be air or hydraulic oil.

[0038] A roller support 101 is fixedly arranged on the conveyor frame 1, and the bending roller 2 is rotatably arranged on the roller support 101. The bending roller 2 is supported and limited by the roller support 101. Driving belt rollers 102 are respectively arranged at both ends of the conveyor frame 1, and the conveyor belt 3 is supported and tensioned by the driving belt rollers 102. The upper part of the anti-drop shield 4 is connected to a product input cover 401. After the drainage sand is processed, it is input to the top of the conveyor belt 3 through the product input cover 401 for transportation.

[0039] When the anti-drop conveying mechanism of the present invention is used, the driving belt roller 102 is driven to rotate by a motor or other equipment, so that the driving belt roller 102 drives the conveyor belt 3 to operate and convey. Figure 1 As shown in the figure, the conveyor belt 3 is an endless rubber belt. When the conveyor belt 3 runs to the position of the bending roller 2, the two sides of the conveyor belt 3 are folded upwards through the support of the bending roller 2 to form a U shape. At this time, the two sides of the anti-drop shield 4 that are bent downward overlap and contact with it to achieve shielding protection. The product input cover 401 is connected to the production equipment of the drainage sand, such as a stirring kettle, and the completed drainage sand product is discharged onto the conveyor belt 3 through the product input cover 401, and is transported and discharged through one end through the operation of the conveyor belt 3.

[0040] like Figure 4 As shown in , the air pump module 505 is running, extracting the gas in the negative pressure top chamber 502, inputting it into the corrugated connecting pipe 506, and then passing through the top pipe 507, the diversion pipe 508 and the side wall air pipe 509 in turn into the equalizing pipe 501, so that the air flow slot 5 is positively pressurized and the positive pressure air flow intervenes between the contact surface of the conveyor belt 3 and the anti-drop shield 4 to form an air film, which reduces the contact wear between the two and reduces the friction, making it more energy-efficient; at the same time, because the contact surface between the conveyor belt 3 and the anti-drop shield 4 is in a positive pressure state, it can suppress the entry of drainage sand and dust. Figure 4As shown in the figure, when the airflow is ejected through the airflow slot 5, the airflow is split to both sides between the contact surface of the conveyor belt 3 and the anti-drop shield 4, a part of the airflow returns to the inside of the anti-drop shield 4, and the other part of the airflow is discharged to the outside. Since the airflow ejected through the airflow slot 5 does not completely return to the anti-drop shield 4, the suction flow rate of the negative pressure top bin 502 to the anti-drop shield 4 is greater than the return flow rate of the airflow ejected from the airflow slot 5, so that the closed structure formed by the conveyor belt 3 and the anti-drop shield 4 is in a negative pressure state, thereby suppressing the discharge of dust to the outside of the conveyor belt 3 and the anti-drop shield 4.

[0041] During the operation of the air pump module 505, the air pump module 505 can drive the mesh bottom plate 503 and the filter layer 504 to vibrate, thereby achieving automatic cleaning of the filter layer 504, making the filter layer 504 less prone to clogging and reducing the frequency of maintenance.

[0042] like Figure 8 and Fig. 9 As shown in , the extension shaft 510 is fixedly installed with the motor shaft of the driving motor of the air pump module 505. When the air pump module 505 is running, the extension shaft 510 rotates synchronously. The counterweight block 512 is an eccentric counterweight structure, which can make the extension shaft 510 and the air pump module 505 vibrate during the rotation of the extension shaft 510; when the filter layer 504 is blocked, as the air pump module 505 is running and pumping air, the internal negative pressure of the negative pressure top chamber 502 increases. At this time, the floating plug disc 527 moves downward under the drive of the negative pressure, compressing the support spring 528 until balance is reached, and the central piston 530 moves upward relative to the central tube 529 synchronously, so that the medium in the central tube 529 enters through the medium pipeline 525 and the interactive transfer tube 522 In the driven cavity 518, the driving piston 519 in the driven cavity 518 is pushed to move. At this time, the driving piston 519 drives the rack plate 517 to move to the left through the piston shaft 520. The gear plate 516 and the rack plate 517 are engaged with each other, so that the gear plate 516 rotates, and the synchronous adjustment screw rod 514 rotates, which can drive the counterweight block 512 to move upward relative to the track outer frame 511, so that the counterweight block 512 is away from the extension shaft 510. When the rotation speed of the extension shaft 510 is inconvenient, the amplitude of the vibration of the extension shaft 510 caused by the counterweight block 512 is greatly increased.

[0043] On the contrary, when the filter layer 504 is less blocked, the counterweight 512 is similarly close to the extension shaft 510, reducing the vibration amplitude of the extension shaft 510, so that when the filter layer 504 is seriously blocked, the device can automatically increase the amplitude to improve the vibration cleaning effect of the filter layer 504, and when the filter layer 504 is not seriously blocked, the amplitude is automatically reduced to slow down the metal fatigue rate and operating noise of components such as the mesh bottom plate 503.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-drop conveying mechanism for drainage sand products, comprising a conveying frame, a bending roller shaft arranged on the conveying frame and a conveying belt, characterized in that: Through the support of the bending roller shaft, the two sides of the conveyor belt are folded upward to form a U shape; the anti-drop conveying mechanism also includes: An anti-drop shield, which is used to shield the drainage sand to prevent the drainage sand transported on the conveyor belt from falling. Both sides of the anti-drop shield are bent downward and overlap with the two sides of the conveyor belt that are folded upward; The airflow slots are provided on the two side surfaces of the anti-drop shield that are bent downwards, and the airflow slots are arranged parallel to the length direction of the anti-drop shield. Positive pressure airflow is sprayed through the airflow slots, so that the airflow intervenes between the contact surface of the conveyor belt and the anti-drop shield.

2. The anti-drop conveying mechanism for drainage sand products according to claim 1, characterized in that: The anti-drop shield is provided with a flow balancing tube, which is parallel to and corresponds to the air flow slot and is in communication with each other; A negative pressure top chamber is arranged on the upper part of the anti-drop shield, a mesh bottom plate is arranged on the bottom of the negative pressure top chamber, a filter layer is attached to the lower surface of the mesh bottom plate, the negative pressure top chamber is connected with the inner cavity of the anti-drop shield, and the gas entering the negative pressure top chamber from the anti-drop shield can be filtered through the filter layer; An air pump module is fixedly arranged on the mesh bottom plate, and the air pump module can drive the mesh bottom plate to resonate. The air pump module extracts gas in the negative pressure top chamber and inputs it into the flow equalizing pipe.

3. The anti-drop conveying mechanism for drainage sand products according to claim 2, characterized in that: The air outlet end of the air pump module is connected with a corrugated connecting pipe, a top pipe is connected with the corrugated connecting pipe, a diversion pipe is connected with the top pipe, a side wall air pipe is attached to the surface of the anti-drop shield, and the diversion pipe is connected with the flow equalizing pipe through the side wall air pipe.

4. The anti-drop conveying mechanism for drainage sand products according to claim 2, characterized in that: An extension shaft is coaxially fixedly arranged on the motor shaft of the air pump module, and a track outer frame is fixedly arranged on the surface of the extension shaft; A counterweight block is arranged outside the extension shaft, a track side groove is opened on the surface of the counterweight block, and the track outer frame is limitedly arranged in the track side groove, so that the counterweight block slides along the radial limit of the extension shaft.

5. The anti-drop conveying mechanism for drainage sand products according to claim 4, characterized in that: An adjusting screw rod is inserted in the counterweight block, and the adjusting screw rod is spirally matched with the counterweight block, and the movement of the counterweight block is controlled by rotating the adjusting screw rod.

6. The anti-drop conveying mechanism for drainage sand products according to claim 5, characterized in that: A control shaft cavity is provided in the extension shaft, and a gear plate and a rack plate are arranged in the control shaft cavity. The gear plate is coaxially fixed with the adjusting screw rod, and the gear plate and the rack plate are meshed with each other. When the rack plate moves along the axial direction of the extension shaft, the gear plate rotates.

7. The anti-drop conveying mechanism for drainage sand products according to claim 6, characterized in that: A driven cavity is fixedly provided at the end of the extension shaft, a driving piston is provided in the driven cavity, the driven cavity is in sealing contact with the driving piston, a piston shaft is fixedly provided on the driving piston, and one end of the piston shaft is fixedly mounted on the rack plate; A pressure equalizing hole is formed through the surface of the driven cavity tube on one side facing the extension shaft, and an alternating rotating tube is coaxially arranged on the side of the driven cavity tube away from the extension shaft. A sealing rotating sleeve is provided on the surface sealing cover of the alternating rotating tube, and a stabilizing frame is fixedly arranged on the outside of the sealing rotating sleeve. The sealing rotating sleeve is fixedly installed with the air pump module through the stabilizing frame, and a medium pipeline is connected to the sealing rotating sleeve, and the medium pipeline is connected to the inner cavity of the driven cavity tube through the alternating rotating tube.

8. The anti-drop conveying mechanism for drainage sand products according to claim 7, characterized in that: An annular pressure-sensitive ring is provided on the surface of the negative pressure top chamber, a floating plug disc is provided in the annular pressure-sensitive ring in airtight contact, and a supporting spring for applying an upward supporting elastic force to the floating plug disc is provided below the floating plug disc.

9. The anti-drop conveying mechanism for drainage sand products according to claim 8, characterized in that: A central tube is arranged at the center of the floating plug disc, a central piston is arranged in the central tube, the central piston is in sealing contact with the central tube, and a straight shaft tube is fixedly arranged at the lower part of the central piston.

10. The anti-drop conveying mechanism for drainage sand products according to claim 9, characterized in that: The lower end of the straight shaft tube is connected to the medium pipeline, and the upper end of the straight shaft tube is connected to the upper surface of the central piston, so that when the central piston moves upward relative to the central tube, the medium in the central tube can enter the medium pipeline through the straight shaft tube.

11. The anti-drop conveying mechanism for drainage sand products according to claim 1, characterized in that: A roller bracket is fixedly arranged on the conveyor frame, and the bending roller is rotatably arranged on the roller bracket. The bending roller is supported and limited by the roller bracket. Driving belt rollers are respectively arranged at both ends of the conveyor frame, and the conveyor belt is supported and tensioned by the driving belt rollers.

12. The anti-drop conveying mechanism for drainage sand products according to claim 1, characterized in that: The upper part of the anti-drop shield is connected to a product input shield, and after the drainage sand is processed, it is input to the top of the conveyor belt through the product input shield for transportation.

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