Anti-pollution transfer unloading trolley for transferring quartz sand

Abstract

The invention provides an anti-pollution transfer unloading trolley for transferring quartz sand, which comprises a frame body provided with rollers at the bottom, a turnover mechanism arranged on the frame body, a hopper with an open upper end and used for containing the quartz sand, and a shielding mechanism arranged at the upper end of the hopper, and the hopper is arranged on the turnover mechanism. A discharging opening is formed in one side of the hopper, the overturning mechanism can drive the hopper to conduct overturning discharging, in the hopper transferring process of the frame body and the overturning discharging process of the hopper, the opening position of the hopper is shielded through the shielding mechanism, and the isolation effect can be achieved; the phenomenon that suspended particulate matter or other foreign matter in outside air is mixed into quartz sand in the hopper in the transferring process is reduced, the transferring safety of the quartz sand is guaranteed, in the discharging process, the shielding mechanism can also play a role in preventing quartz dust from escaping, and dust pollution caused to a workshop is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quartz sand transfer trolley, in particular to a pollution prevention transfer and unloading trolley for transferring quartz sand. BACKGROUND

[0002] Quartz sand is a core basic raw material for supporting strategic high-end industries such as semiconductor chip manufacturing, photovoltaic component packaging, and optical fiber communication transmission. The purity of quartz sand directly determines the performance of downstream products. For example, the purity of quartz sand for semiconductors needs to reach 99.999% or above, and the purity of quartz sand for photovoltaics needs to be no less than 99.99%. Therefore, the production process of quartz sand needs to go through multiple purification processes such as magnetic separation and flotation to achieve targeted and stepwise removal of impurities.

[0003] However, in the cross-process transfer link of quartz sand from the magnetic separation equipment to the flotation equipment, most enterprises currently use open and unsealed steel trolleys for inter-process transfer of quartz sand. During the transfer process, the trolley body is basically in a completely open state. Due to the lack of professional dustproof isolation devices, suspended particulate matter (such as dust, silicon powder generated by other processes in the workshop), and harmful metal elements such as Fe, Al, Na, Ca, and K dissolved or attached in the air in the transfer environment will mix into the quartz sand through gravity settling and airflow entrainment, which can easily cause degradation of product purity. On the other hand, during the unloading process, the open trolley also produces some quartz dust during unloading, causing dust pollution in the workshop. SUMMARY

[0004] Therefore, it is necessary to provide a pollution prevention transfer and unloading trolley for transferring quartz sand to solve the technical problem of quartz sand being easily contaminated during the cross-process transfer link in the prior art.

[0005] The technical solution adopted by the present application to solve its technical problems is: A pollution prevention transfer and unloading trolley for transferring quartz sand, comprising a trolley body provided with rollers at the bottom, a turnover mechanism provided on the trolley body, a hopper for holding quartz sand with an open top, and a shielding mechanism provided on the top of the hopper. The hopper is provided on the turnover mechanism, and a discharge port is provided on one side of the hopper. The turnover mechanism can drive the hopper to turn over and unload. The shielding mechanism can shield the open top of the hopper during the transfer of the hopper and the turnover and unloading process of the hopper.

[0006] Preferably, the turnover mechanism comprises a carrier frame and a telescopic arm, a bearing seat is arranged on one side of the upper end of the frame body, one end of the carrier frame is pivotally connected with the bearing seat, the other end of the carrier frame is freely arranged on the upper end of the frame body, the upper end of the telescopic arm is pivotally connected with the other end of the carrier frame away from the bearing seat, the lower end of the telescopic arm is pivotally connected with the lower end of the frame body, the hopper is fixedly arranged on the carrier frame, and the discharge port of the hopper faces one side of the frame body where the bearing seat is arranged, and the telescopic arm can push the carrier frame to turn over to one side of the frame body where the bearing seat is arranged, so that the hopper is turned over to discharge materials.

[0007] Preferably, the shielding mechanism comprises a dustproof roller shutter, a roller shaft and two shaft supports, the roller shaft is transversely arranged on one side of the upper end of the hopper, the two shaft supports are correspondingly arranged at the two ends of the roller shaft and fixed with the hopper, the roller shaft and the two shaft supports can freely rotate relative to each other, a volute spring is wound around one end or both ends of the roller shaft, the inner end of the volute spring is fixed on the roller shaft, and the outer end of the volute spring is fixed on the shaft support, the dustproof roller shutter is wound on the roller shaft, the width of the dustproof roller shutter is greater than the width of the hopper, a connecting plate is transversely arranged on the release end of the dustproof roller shutter, a fixing hook is arranged on the connecting plate, a hanging piece matched with the fixing hook is arranged on the other side of the upper end of the hopper opposite to the roller shaft, the connecting plate is pulled towards the hanging piece, the roller shaft can be adaptively rotated to release the dustproof roller shutter, the fixing hook is hooked on the hanging piece, the release end of the dustproof roller shutter can be fixed, the dustproof roller shutter shields the opening of the hopper, after the fixing hook and the connecting plate are loosened, the roller shaft can be reversely rotated under the deformation force of the volute spring, the dustproof roller shutter is wound and collected, and the upper end of the hopper is opened.

[0008] Preferably, a clamping edge protruding outward is arranged on the upper end edge of the connecting plate opposite to the two ends, the two ends of the connecting plate are provided with clamping grooves matched with the clamping edge, and the clamping grooves at the two ends of the connecting plate are clamped on the clamping grooves on the two sides of the hopper and can freely slide along the length direction of the clamping grooves.

[0009] Preferably, a sealing strip capable of contacting the dustproof roller shutter is arranged on the circumferential edge of the upper end of the hopper.

[0010] Preferably, a flexible dust suppression cover is arranged on the outside of the discharge port of the hopper.

[0011] Preferably, the frame body is further provided with a lifting stabilizing mechanism, the lifting stabilizing mechanism comprises a lifting frame and lifting arms, four corners of the frame body are vertically provided with supporting columns, four corners of the lifting frame are provided with sliding sleeves matched with the supporting columns, the sliding sleeves of the four corners of the lifting frame are correspondingly sleeved on the supporting columns of the four corners of the frame body and freely slide up and down along the supporting columns, supporting legs extending downward are arranged outside the four corners of the lifting frame, supporting feet are respectively arranged at lower ends of the supporting legs, the lifting arms are at least two groups, are vertically arranged at two sides of the upper end of the lifting frame and are centrally and symmetrically arranged, lower ends of the lifting arms are fixedly connected with the lifting frame, upper ends of the lifting arms are fixedly connected with the upper end of the frame body, the two groups of lifting arms are synchronously lifted and lowered, the lifting frame can be driven to move up and down along the frame body, after the lifting frame is lifted, the supporting feet can be upwardly retracted, the bottom of the supporting feet is higher than the rollers, after the lifting frame is lowered, the supporting feet can be supported on the ground and the frame body can be lifted upward to adjust the height of the frame body.

[0012] Preferably, the telescopic arm and the lifting arm are both pneumatic cylinders, a pneumatic cylinder control valve is arranged on the frame body, the pneumatic cylinder control valve is correspondingly connected with the telescopic arm and the lifting arm, a quick adapter connected with an external air source is arranged on the pneumatic cylinder control valve, after the pneumatic cylinder control valve is connected with the external air source, the telescopic arm and the lifting arm can be correspondingly controlled to work through the pneumatic cylinder control valve.

[0013] Preferably, the roller is a universal wheel, the bottom of the supporting foot is provided with an antiskid pad.

[0014] Preferably, the frame body is further provided with a weighing mechanism, the weighing mechanism comprises a weighing sensor and a weighing display instrument, the weighing sensor is fixed between the hopper and the bearing frame and located at the bottom of the hopper, the weighing display instrument is arranged on one side of the frame body, the weighing display instrument is electrically connected with the weighing sensor, for receiving a detection signal of the weighing sensor and converting the detection signal into a current weight data value corresponding to the detection signal to display.

[0015] As can be seen from the above technical solution, the pollution-proof transfer and unloading trolley for transferring quartz sand provided in this application includes a frame body with rollers at the bottom, a tilting mechanism on the frame body, a hopper with an open top for holding quartz sand, and a shielding mechanism on the top of the hopper. The hopper is set on the tilting mechanism, and a discharge port is provided on one side of the hopper. The tilting mechanism can drive the hopper to tilt and unload. Its beneficial effects are: during the transfer of the hopper and during the tilting and unloading process, the frame body shields the open part of the hopper through the shielding mechanism, which can play an isolation role, reducing the occurrence of suspended particulate matter or other foreign objects in the outside air mixing into the quartz sand in the hopper during the transfer process, which is conducive to ensuring the safety of quartz sand transfer. In addition, during the unloading process, the shielding mechanism can also prevent quartz dust from escaping, reducing dust pollution to the workshop. Attached Figure Description

[0016] Figure 1 This is a side view of the invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the invention from another angle.

[0019] Figure 4 A schematic diagram of the structure for installing a dustproof roller shutter on a hopper.

[0020] Figure 5 This is a schematic diagram of the structure of a dustproof roller shutter.

[0021] Figure 6 for Figure 4 A magnified view of a portion of point A in the middle.

[0022] Figure 7 This is a schematic diagram of the lifting and stabilizing mechanism.

[0023] Figure 8 This is a side view of the hopper in a flipped-over state.

[0024] Figure 9 This is a three-dimensional structural diagram of the hopper in a flipped state.

[0025] In the diagram: 10. Frame body, 11. Roller, 12. Bearing seat, 13. Pneumatic cylinder control valve, 14. Quick adapter, 15. Pin, 20. Tilting mechanism, 21. Bearing frame, 22. Telescopic arm, 30. Hopper, 31. Discharge port, 32. Hanging piece, 33. Clamping edge, 34. Sealing strip, 40. Shielding mechanism, 41. Dustproof roller shutter, 42. Roller shaft, 43. Shaft bracket, 44. Scroll spring, 45. Connecting plate, 46. Fixing hook, 47. Handle, 48. Slot, 50. Dust suppression cover, 60. Lifting and stabilizing mechanism, 61. Lifting frame, 62. Lifting arm, 63. Sliding sleeve, 64. Outrigger, 65. Support foot, 70. Weighing mechanism, 71. Weighing sensor, 72. Weighing display instrument. Detailed Implementation

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Please refer to Figures 1 to 4 This invention provides a pollution-proof transfer and unloading trolley for transferring quartz sand, comprising a frame body 10 with rollers 11 at the bottom, a tilting mechanism 20, a hopper 30 with an open top for holding quartz sand, and a shielding mechanism 40 disposed on the upper part of the hopper 30. The tilting mechanism 20 is disposed on the frame body 10, and the hopper 30 is disposed on the tilting mechanism 20. A discharge port 31 is disposed on one side of the hopper 30. The tilting mechanism 20 can drive the hopper 30 to tilt and unload towards the discharge port 31. The rollers 11 are universal wheels, correspondingly disposed at the four corners of the bottom of the frame body 10. By manually pushing the frame body 10, the hopper 30 can be carried in magnetic separation. The equipment workshop and the flotation equipment workshop freely transfer quartz sand. When loading quartz sand into the hopper 30, the shielding mechanism 40 can retract to one side of the upper end of the hopper 30, opening the upper end of the hopper 30 to facilitate the loading of the quartz sand to be transferred into the hopper 30. After loading, the shielding mechanism 40 can shield the open end of the hopper 30, which can play an isolation role, preventing suspended particles or other foreign objects in the outside air from mixing into the quartz sand in the hopper 30 during the transfer process. During the unloading process, the shielding mechanism 40 can also shield the open end of the hopper 30, which can prevent the quartz dust generated during the unloading process from escaping and reduce the dust pollution caused to the workshop.

[0028] Please refer to Figure 1 and Figure 8Specifically, the flipping mechanism 20 includes a support frame 21 and a telescopic arm 22. A bearing seat 12 is provided on one side of the upper end of the frame body 10. One end of the bottom of the support frame 21 is pinned to the bearing seat 12 by a pin 15. The other end of the support frame 21 is freely placed on the upper end of the frame body 10. The upper end of the telescopic arm 22 is pinned to the other end of the support frame 21 away from the bearing seat 12, and the lower end of the telescopic arm 22 is pinned to the lower end of the frame body 10. The hopper 30 is fixedly installed on the support frame 21, and the discharge port 31 of the hopper 30 faces the side of the frame body 10 where the bearing seat 12 is located. When loading, the telescopic arm 22 is in a retracted state. At this time, the support frame 21 is placed parallel to the upper end of the frame body 10. When unloading, by controlling the extension of the telescopic arm 22, the support frame 21 is pushed to flip towards the side of the frame body 10 where the bearing seat 12 is located, so that the hopper 30 is flipped and unloaded by the support frame 21.

[0029] Please refer to Figures 4 to 6 The shielding mechanism 40 includes a dustproof roller shutter 41, a roller 42, and two shaft supports 43. The roller 42 is horizontally arranged on one side of the upper end of the hopper 30. The two shaft supports 43 are respectively arranged at both ends of the roller 42 and fixedly connected to the upper edge of the hopper 30 to support the roller 42. The roller 42 and the two shaft supports 43 can rotate freely relative to each other. A spiral spring 44 is wound and sleeved at one or both ends of the roller 42. The inner end of the coil spring 44 is fixed to the roller 42, and the outer end of the spiral spring 44 is fixed to the shaft bracket 43. The dustproof roller shutter 41 is preferably made of PP material. The dustproof roller shutter 41 is wound on the roller 42, and the width of the dustproof roller shutter 41 is greater than the width of the hopper 30. A connecting plate 45 is provided laterally at the release end of the dustproof roller shutter 41. The connecting plate 45 is parallel to the roller 42, and a fixing hook 46 is provided on the connecting plate 45. The upper end of the hopper 30 is connected to the roller 42. On the other side, a hook 32 matching the fixing hook 46 is provided. When the connecting plate 45 is manually pulled towards the hook 32, the roller 42 can rotate adaptively to release the dustproof roller shutter 41. When the fixing hook 46 is manually hooked onto the hook 32, the release end of the dustproof roller shutter 41 can be fixed so that the dustproof roller shutter 41 covers the opening of the hopper 30. During the process of the roller 42 rotating to release the dustproof roller shutter 41, the spiral spring will be activated. The spiral spring 44 is twisted, causing it to coil and contract. The deformation force of the spiral spring 44 pulls on the dustproof roller shutter 41, tightening it so that it fits snugly against the upper opening of the hopper 30. When the fixing hook 46 and connecting plate 45 are released, the roller 42, under the elastic deformation force of the spiral spring 44, can rotate in the opposite direction, winding and retracting the dustproof roller shutter 41, thus opening the upper end of the hopper 30. For easier operation of the dustproof roller shutter 41, a handle 47 is provided at the upper end of the connecting plate 45, allowing the connecting plate 45 to be moved by pulling the handle 47.

[0030] Please continue reading. Figures 4 to 6 Furthermore, the hopper 30 has outwardly protruding retaining edges 33 on the upper edges of both ends of the connecting plate 45. The connecting plate 45 has retaining grooves 48 at both ends that match the retaining edges 33. The retaining grooves 48 at both ends of the connecting plate 45 are engaged with the retaining grooves 48 on both sides of the hopper 30. The connecting plate 45 can slide freely along the length of the retaining grooves 48. During the release or winding of the dustproof roller shutter 41, the retaining grooves 48 and retaining edges 33 cooperate to limit the movement, ensuring that the connecting plate 45 always moves close to the upper edge of the hopper 30. To improve the airtightness of the upper opening of the hopper 30, sealing strips 34 are provided on all four perimeters of the upper end of the hopper 30. When the dustproof roller shutter 41 is covered at the upper opening of the hopper 30, the sealing strips 34 come into contact with the dustproof roller shutter 41.

[0031] See Figure 2 or Figure 4 Furthermore, a flexible dust suppression hood 50 is fitted around the discharge port 31 of the hopper 30. The dust suppression hood 50 is a cylindrical structure made of PP material, which can adaptively deform under external force. The discharge port 31 of the hopper 30 is used to dock with the feed port of the flotation equipment for unloading. During unloading, the dust suppression hood 50 can be placed around the feed port of the flotation equipment. During the unloading process, the dust suppression hood 50 can adaptively deform with the tilting angle of the hopper 30. The dust suppression hood 50 can block the quartz dust generated during the unloading process of the hopper 30, reducing the dispersion of quartz dust and thus reducing the pollution caused by quartz dust to the workshop. During loading or transfer, the open end of the dust suppression hood 50 can also be folded and closed to seal the discharge port 31 of the hopper 30, which can also prevent outside air or other foreign objects from mixing into the quartz sand in the hopper 30 through the discharge port 31.

[0032] See Figure 1 , Figure 7 , Figure 8 and Figure 9Furthermore, the frame body 10 is also provided with a lifting and stabilizing mechanism 60, which includes a lifting frame 61 and a lifting arm 62. Support columns are vertically arranged at the four corners of the frame body 10. Sliding sleeves 63 matching the support columns are provided at the four corners of the lifting frame 61. The sliding sleeves 63 at the four corners of the lifting frame 61 are correspondingly fitted onto the support columns at the four corners of the frame body 10 and slide freely up and down along the support columns. The lifting frame 61 is positioned on the outer side at its four corners. The vehicle has downward-extending support legs 64, each with a support foot 65 at its lower end. All support feet 65 are at the same height and have anti-slip pads at their bottom. There are at least two sets of lifting arms 62, vertically positioned on both sides of the upper end of the lifting frame 61 and symmetrically arranged centrally. The lower ends of the lifting arms 62 are fixedly connected to the lifting frame 61, and the upper ends are fixedly connected to the upper end of the vehicle frame body 10. The two sets of lifting arms 62 rise and fall synchronously, driving the lifting frame. The lifting frame 61 moves up and down along the frame body 10. During the transfer and movement, the lifting frame 61 can be raised by two sets of lifting arms 62, causing the support legs 65 to retract upwards, so that the bottom of the support legs 65 is higher than the rollers 11. At this time, the rollers 11 are in contact with the ground, used to support the frame body 10, and can roll freely to allow the frame body 10 to move. When unloading, in order to prevent the frame body 10 from moving, the lifting frame 61 can be lowered by two sets of lifting arms 62. After the lifting frame 61 is lowered, the support legs 65 can be supported on the ground, raising the frame body 10 upwards and suspending the rollers 11. The support legs 65 can provide support for the frame body 10, and the friction between the support legs 65 and the ground can limit the movement of the frame body 10, ensuring the stability of the hopper 30 during the unloading process. In addition, the height of the frame body 10 can be adjusted by the lifting frame 61, which makes it convenient for the hopper 30 to discharge into the feed inlet of the flotation equipment with different setting heights.

[0033] It should be noted that the weight of the frame body 10 and the lifting and stabilizing mechanism 60 is greater than the maximum load capacity of the hopper 30, which can provide stable support for the hopper 30 and ensure the stability of the hopper 30 during the tipping and unloading process.

[0034] Please refer to Figure 3In the above embodiment, both the telescopic arm 22 and the lifting arm 62 are pneumatic cylinders. A pneumatic cylinder control valve 13 is provided on the frame body 10. There are two sets of pneumatic cylinder control valves 13, which are respectively connected to the telescopic arm 22 and the lifting arm 62. A quick adapter 14 is provided at the input end of each pneumatic cylinder control valve 13. The quick adapter 14 can be quickly connected to an external air source. For example, it can be connected to a spare high-pressure gas pipeline or air compressor set outside the flotation equipment to provide power to the telescopic arm 22 and the lifting arm 62. After the pneumatic cylinder control valve 13 is connected to the external air source, it can control the telescopic arm 22 and the lifting arm 62 to work respectively.

[0035] Please continue reading. Figure 3 Furthermore, a weighing mechanism 70 is also provided on the frame body 10. The weighing mechanism 70 includes a weighing sensor 71 and a weighing display instrument 72. The weighing sensor 71 is fixed between the hopper 30 and the support frame 21. There are four weighing sensors 71. The upper end of each weighing sensor 71 is fixed to the four bottom corners of the hopper 30, and the lower end of each weighing sensor 71 is fixed to the support frame 21. The weighing display instrument 72 is located on one side of the frame body 10. The weighing display instrument 72 is electrically connected to the weighing sensor 71 and is used to receive the detection signal from the weighing sensor 71. The weight is converted into a corresponding current weight data value and displayed. The weighing sensor 71 and the weighing display instrument 72 can weigh the hopper 30 so as to control the weight of the quartz sand transferred by the hopper 30 according to the feed amount of the flotation equipment. The weighing display instrument 72 is also equipped with a voice prompt device, which is electrically connected to the weighing display instrument 72. During the loading process, the loading amount can be preset through the weighing display instrument 72. When the loading amount reaches the preset value, the weighing display instrument 72 can issue a voice prompt through the voice prompt device to remind the workers to stop loading in time.

[0036] In practical use, the pollution-proof transfer and unloading trolley is operated manually by pushing the frame body 10 carrying the hopper 30 into the loading area. The connecting plate 45 is manually released, allowing the dustproof curtain 41 to roll up and retract, opening the upper end of the hopper 30. The loading amount of quartz sand is set according to the feed rate of the flotation equipment. After setting, loading begins. Once loading is complete, the connecting plate 45 is manually pulled to release the dustproof curtain 41, which then covers the upper end of the hopper 30. The frame body 10 is then manually pushed to rotate to the feed inlet of the flotation equipment. The spare high-pressure gas pipeline outside the flotation equipment is manually connected to the quick-connect adapter 14 on the pneumatic cylinder control valve 13. The two sets of lifting arms 62 are extended by controlling the pneumatic cylinder control valve 13, so that the support feet 65 are supported on the ground. According to the height of the feed inlet of the flotation equipment, the frame body 10 is raised so that the discharge port 31 of the hopper 30 is directly opposite the feed inlet of the flotation equipment. The dust suppression hood 50 is manually placed around the feed inlet of the flotation equipment. Then, the telescopic arm 22 is controlled by the pneumatic cylinder control valve 13 to push the hopper 30 to flip and discharge the material. After the material is discharged, the hopper 30 and the support feet 65 are reset by controlling the pneumatic cylinder control valve 13. The dust suppression hood 50 is manually retracted. Then, the high-pressure gas pipeline is manually separated from the quick adapter 14, thus completing the transfer operation.

[0037] During the cross-process transfer of quartz sand from the magnetic separation equipment to the flotation equipment using this pollution-proof transfer and unloading trolley, the occurrence of suspended particulate matter or other foreign matter in the outside air mixed into the quartz sand in the hopper 30 can be effectively reduced. This helps to ensure the safety of quartz sand transfer and also helps to prevent quartz dust from escaping, thus reducing dust pollution to the workshop.

[0038] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A pollution-proof transfer and unloading trolley for transferring quartz sand, characterized in that: The device includes a frame body with rollers at the bottom, a tilting mechanism on the frame body, a hopper with an open top for holding quartz sand, and a shielding mechanism on the top of the hopper. The hopper is mounted on the tilting mechanism and has a discharge port on one side. The tilting mechanism can drive the hopper to tilt and discharge the material. During the transfer of the hopper by the frame body and during the tilting and discharge of the hopper, the shielding mechanism can shield the open part of the hopper.

2. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 1, characterized in that: The flipping mechanism includes a support frame and a telescopic arm. A bearing seat is provided on one side of the upper end of the frame body. One end of the support frame is pinned to the bearing seat, and the other end of the support frame is freely placed on the upper end of the frame body. The upper end of the telescopic arm is pinned to the other end of the support frame away from the bearing seat, and the lower end of the telescopic arm is pinned to the lower end of the frame body. The hopper is fixedly installed on the support frame, and the discharge port of the hopper faces the side of the frame body where the bearing seat is located. The telescopic arm can push the support frame to flip towards the side of the frame body where the bearing seat is located, so that the hopper can flip and discharge material.

3. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 2, characterized in that: The shielding mechanism includes a dustproof roller shutter, a roller shaft, and two shaft supports. The roller shaft is horizontally positioned on one side of the upper end of the hopper. The two shaft supports are respectively positioned at both ends of the roller shaft and fixed to the hopper. The roller shaft and the two shaft supports can rotate freely relative to each other. A spiral spring is wound around one or both ends of the roller shaft. The inner end of the spiral spring is fixed to the roller shaft, and the outer end of the spiral spring is fixed to the shaft supports. The dustproof roller shutter is wound around the roller shaft. The width of the dustproof roller shutter is greater than the width of the hopper. A connecting plate is horizontally positioned at the release end of the dustproof roller shutter. A fixing hook is provided on the connecting plate, and a hook that matches the fixing hook is provided on the other side of the upper end of the hopper opposite to the roller. When the connecting plate is pulled towards the hook, the roller can rotate adaptively to release the dustproof roller shutter. When the fixing hook is hooked onto the hook, the release end of the dustproof roller shutter can be fixed so that the dustproof roller shutter covers the open part of the hopper. After the fixing hook and the connecting plate are released, the roller can rotate in the opposite direction under the deformation force of the spiral spring to wind up and retract the dustproof roller shutter so that the upper end of the hopper is open.

4. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 3, characterized in that: The hopper has outwardly protruding retaining edges on the upper edges of both ends of the connecting plate. The connecting plate has retaining grooves at both ends that match the retaining edges. The retaining grooves at both ends of the connecting plate are engaged with the retaining grooves on both sides of the hopper and can slide freely along the length of the retaining grooves.

5. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 4, characterized in that: The upper part of the hopper is provided with a sealing strip on its four perimeter that can come into contact with the dustproof roller shutter.

6. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 5, characterized in that: The hopper is fitted with a flexible dust suppression cover on the outside of its discharge port.

7. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in any one of claims 2 to 6, characterized in that: The frame body is also equipped with a lifting and stabilizing mechanism, which includes a lifting frame and lifting arms. Support columns are vertically arranged at the four corners of the frame body. Sliding sleeves matching the support columns are arranged at the four corners of the lifting frame. These sliding sleeves are fitted onto the support columns at the four corners of the frame body and slide freely up and down along the support columns. Downward-extending legs are arranged on the outer sides of the four corners of the lifting frame, with a supporting foot at the lower end of each leg. There are at least two sets of lifting arms, vertically arranged on both sides of the upper end of the lifting frame, symmetrically positioned in the center. The lower end of the lifting arm is fixedly connected to the lifting frame, and the upper end of the lifting arm is fixedly connected to the upper end of the frame body. The two sets of lifting arms lift and lower synchronously, driving the lifting frame to move up and down along the frame body. When the lifting frame rises, the supporting feet retract upwards, making the bottom of the supporting feet higher than the rollers. When the lifting frame descends, the supporting feet support the ground, and the frame body is lifted upwards to adjust its height.

8. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 7, characterized in that: Both the telescopic boom and the lifting boom are pneumatic cylinders. A pneumatic cylinder control valve is installed on the vehicle frame body. The pneumatic cylinder control valve is connected to the telescopic boom and the lifting boom respectively. A quick-connect adapter for connecting to an external air source is installed on the pneumatic cylinder control valve. After the pneumatic cylinder control valve is connected to an external air source, the telescopic boom and the lifting boom can be controlled to work respectively through the pneumatic cylinder control valve.

9. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 8, characterized in that: The rollers are omnidirectional wheels, and the bottom of the support feet is provided with anti-slip pads.

10. The pollution-proof transfer and unloading trolley for transferring quartz sand as described in claim 8, characterized in that: The frame body is also equipped with a weighing mechanism, which includes a weighing sensor and a weighing display instrument. The weighing sensor is fixed between the hopper and the support frame and is located at the four corners of the bottom of the hopper. The weighing display instrument is located on one side of the frame body and is electrically connected to the weighing sensor. It is used to receive the detection signal from the weighing sensor and convert it into the corresponding current weight data value for display.

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