A replenishing device for a shot blasting machine

Abstract

This invention discloses a feeding device for a shot blasting machine, comprising a frame, a main screen, an auxiliary screen assembly, and a locking assembly. The main screen is slidably connected to the frame along a first direction and has a first main screen area and at least one second main screen area arranged sequentially. The auxiliary screen assembly includes a first and a second auxiliary screen disposed on both sides of the main screen. The first auxiliary screen and the main screen are staggered along a second direction, and the main screen forms a continuously changing overlapping portion when sliding, first covering the first main screen area, and then covering the second main screen area behind it as the displacement increases. The second auxiliary screen is wound into a cylinder, with its free end connected to the main screen, and can be unfolded. The locking assembly includes independent first and second locking elements, respectively used to restrict the sliding of the main screen and the second auxiliary screen. This invention solves the problem of existing screens requiring complete replacement due to partial damage, resulting in wasted spare parts.

Description

Technical Field

[0001] This invention relates to the field of shot blasting machine technology, and more specifically to a feeding device for shot blasting machines. Background Technology

[0002] Shot blasting requires regular replenishment of stainless steel shot. However, steel shot is prone to moisture absorption and clumping during storage and transportation, and often gets mixed in with woven fragments, cable ties, and other debris from ton bags during unpacking. If these clumps and foreign objects enter the circulation system without being screened, they can easily clog the directional sleeve and blade grooves of the shot blasting machine, causing severe vibration of the blasting head and even damage to components. They can also accumulate at bends or narrow sections of the pipeline, causing sand blockage. Therefore, the current practice is to install a removable screen at the inlet of the feed chute or inside the storage container to intercept clumps, debris, and packaging fragments.

[0003] However, in actual use, because the steel shot's impact point is relatively fixed, the impact and wear on the screen are mainly concentrated in a localized area directly opposite the feed inlet. After long-term operation, this area often shows signs of damage first, such as wire wear and breakage or mesh expansion and deformation, while most of the rest of the screen remains intact, far from meeting the replacement standard. However, due to the screen's integrated structure, once localized damage occurs, it is impossible to repair or replace the damaged parts individually; the entire screen must be removed and replaced with a new one. As a result, a large amount of intact screen material is prematurely discarded, increasing spare parts costs and causing waste. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a feeding device for shot blasting machines, so as to solve the technical problem that the existing screens need to be replaced as a whole after partial damage, resulting in waste of spare parts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A feeding device for shot blasting machines is provided, including:

[0007] Frame;

[0008] The main screen is slidably connected to the frame along a first direction and has a first main screen area and at least one second main screen area arranged sequentially along the first direction.

[0009] An auxiliary screen assembly includes a first auxiliary screen and a second auxiliary screen respectively disposed on both sides of a main screen along a first direction. The first auxiliary screen is attached to the frame and is staggered with the main screen along a second direction perpendicular to the first direction, so as to form a continuously variable overlapping portion with the main screen when the main screen slides. The overlapping portion covers the first main screen area and selectively covers one or more second main screen areas located behind the first main screen area as the sliding displacement increases. The second auxiliary screen is wound into a cylinder shape, and its free end is attached to the main screen to at least partially unfold the second auxiliary screen. The first main screen area, the second main screen area, the first auxiliary screen, and the second auxiliary screen all have multiple screen holes of the same aperture.

[0010] as well as

[0011] The locking assembly includes a first locking member and a second locking member that are independent of each other, and the first locking member and the second locking member are respectively configured to restrict the sliding of the main screen and the second auxiliary screen.

[0012] In one embodiment, the frame is provided with a sliding groove along a first direction, and the main screen is slidably disposed in the sliding groove.

[0013] In one embodiment, the main screen and the second auxiliary screen are detachably connected, and the second auxiliary screen enters the groove as the main screen slides, so as to slide and engage with the groove.

[0014] In one embodiment, the first locking member includes a pressure block and a rod, the pressure block being removably attached to the main screen and the rod being movably connected to the frame for pressing or releasing the pressure block.

[0015] In one embodiment, the first locking member further includes a handle, under the constraint of the handle, the rod can move in two different directions.

[0016] In one embodiment, the second auxiliary screen is wound around a reel, which is rotatably connected to the frame.

[0017] In one embodiment, a plurality of guide wheels are spaced apart along the outer circumferential surface of the spool, and the plurality of guide wheels are rotatably connected to the frame.

[0018] In one embodiment, the second locking member includes a threaded rod threadedly connected to the frame for engaging or disengaging from the reel.

[0019] In one embodiment, the frame is provided with a groove for accommodating the spool, and the groove is covered by a stop block rotatably connected to the frame, the stop block abutting against or separating from the spool.

[0020] Compared to existing technologies, this invention has the following advantages: When the first main screen area, which faces the discharge port or is subjected to concentrated impact from the steel shot flow for a long time, suffers local damage such as wire breakage or mesh expansion, it is only necessary to release the first and second locking members and push the main screen along the first direction to move the damaged first main screen area away from the discharge point and to the position of the first auxiliary screen. The two form an overlapping part along the second direction. This overlapping part provides physical compensation for the damaged area, ensuring that the steel shot must pass through two layers of screens with the same aperture, thus ensuring that the locally damaged area still has filtering capacity. At the same time, the second main screen area, which was originally in a standby state, is pushed to the fixed discharge point to serve as a new main filtration area to receive the impact of the steel shot flow, transferring subsequent wear to the intact screen surface. The gap exposed on the other side after the main screen moves forward is reduced by... The second auxiliary screen, wound into a cylindrical shape, is simultaneously pulled out and unfolded to completely cover the area, ensuring that steel shot falling at this interval is filtered through the same aperture, preventing unfiltered steel shot from being discharged downwards. Thus, without changing the drop point or requiring complete screen removal, multiple main screen areas on a single main screen can sequentially take over the main filtration function, dispersing impact wear concentrated at one point across the entire screen surface and extending the overall lifespan of the screen. When all main screen areas are used up, only the main screen needs to be replaced. The first and second auxiliary screens, which only perform edge compensation and intermittent filtration tasks, experience far less wear than the main screen areas and can be reused for extended periods, further reducing overall spare parts consumption. Furthermore, each screen area can continuously intercept damp clumps, woven fragments from ton bags, and cable ties, among other foreign objects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a feeding device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the feeding device according to an embodiment of the present invention from another angle;

[0023] Figure 3 This is an exploded view of the main screen and auxiliary screen assembly according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the first main screen region as the main filtration region according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the second main screen area as the main filtration area after the first main screen area of ​​the present invention is damaged, according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the first locking member according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the second locking member according to an embodiment of the present invention.

[0028] The reference numerals in the accompanying drawings include:

[0029] 1. Frame;

[0030] 2. Main screen; 201. First main screen area; 202. Second main screen area;

[0031] 3. First auxiliary screen;

[0032] 4. Second auxiliary screen;

[0033] 5. First locking component; 501. Pressure block; 502. Rod; 503. Handle;

[0034] 6. Second locking element; 601. Threaded rod; 602. Stop block;

[0035] 7. Scroll;

[0036] 8. Guide wheels;

[0037] 9. Groove. Detailed Implementation

[0038] The present invention will be further described in detail below through specific embodiments:

[0039] In embodiments of the present invention, such as Figures 1-5 As shown, the feeding device of the shot blasting machine includes a frame 1, a main screen 2, an auxiliary screen assembly, and a locking assembly. The main screen 2 is slidably connected to the frame 1 along a first direction and has a first main screen area 201 and at least one second main screen area 202 arranged sequentially along the first direction. The auxiliary screen assembly includes a first auxiliary screen 3 and a second auxiliary screen 4 respectively disposed on both sides of the main screen 2 along the first direction. The first auxiliary screen 3 is attached to the frame 1 and is staggered with the main screen 2 along a second direction perpendicular to the first direction, so as to form a continuously variable overlapping portion with the main screen 2 when the main screen 2 slides. This overlapping portion covers the first main screen area 201. As the sliding displacement increases, it selectively covers one or more of the second main screen areas 202 located behind the first main screen area 201. The second auxiliary screen 4 is wound into a cylinder shape, and its free end is attached to the main screen 2 to at least partially unfold the second auxiliary screen 4. The first main screen area 201, the second main screen area 202, the first auxiliary screen 3, and the second auxiliary screen 4 all have multiple screen holes of the same aperture. The locking assembly includes a first locking member 5 and a second locking member 6 that are independent of each other. The first locking member 5 and the second locking member 6 are respectively configured to restrict the sliding of the main screen 2 and the second auxiliary screen 4.

[0040] Specifically, in this embodiment of the invention, the frame 1 serves as the supporting foundation for the entire device and is fixedly installed at the inlet of the shot blasting machine's feeding chute or the feed inlet of the storage tank to form a vertically connected material drop channel for stainless steel shot to pass through from top to bottom. A guide structure is provided on the frame 1 along a first direction. This guide structure can be a linear guide rail, a chute, or a guide rod, used to constrain the main screen 2 to slide only along the first direction, while limiting its movement in the direction perpendicular to the screen surface, ensuring that the screen's working surface is always in a stable horizontal or perpendicular posture to the material drop direction.

[0041] Specifically, the main screen 2 has a rectangular plate-like structure with a rigid frame around its outer edge, and the screen surface area is enclosed by the frame. The frame of the main screen 2 is slidably connected to the guide structure on the frame 1, allowing the main screen 2 to move smoothly relative to the frame 1 in the first direction. The screen surface of the main screen 2 is sequentially divided into a first main screen area 201 and at least one second main screen area 202 along the first direction. Each main screen area is a rectangular area, closely arranged along the first direction, and can be distinguished from each other by the horizontal ribs within the frame or the boundary lines of adjacent areas. In the initial installation state, the first main screen area 201 is directly opposite the center of the feed chute's discharge port, that is, this area is the initial receiving position for the steel shot flow. Each main screen area has multiple screen holes of the same diameter, which is selected according to the range of stainless steel shot particle size used, to ensure that normal shot passes through smoothly while agglomerates and impurities are intercepted.

[0042] Furthermore, the auxiliary screen assembly includes a first auxiliary screen 3 and a second auxiliary screen 4, which are respectively arranged on both sides of the main screen 2 along the first direction, that is, the main screen 2 is located between the first auxiliary screen 3 and the second auxiliary screen 4.

[0043] The first auxiliary screen 3 is a fixed screen, its outer edge being detachably fixed to the frame 1 via connectors, and its screen surface is staggered with that of the main screen 2 in a second direction. This second direction refers to a direction perpendicular to the first direction. Thus, the main screen 2 and the first auxiliary screen 3 partially overlap in the vertical projection direction, and their screen surfaces are not at the same horizontal height, but are staggered vertically. Specifically, the first auxiliary screen 3 is fixed below the main screen 2. When its vertical projection overlaps with the main screen 2, the steel shot falling from the discharge port must first pass through one layer of screen before passing through the other. The screen surface size of the first auxiliary screen 3 matches the size of the first main screen area 201, and its screen surface also has screen holes of the same diameter as the main screen 2.

[0044] The second auxiliary screen 4 adopts a roll-type structure. Specifically, the second auxiliary screen 4 is made of flexible screen material, and one end of it is wound around a roller 7 installed on the frame 1 to form a roll. The roller 7 is rotatably connected to the frame 1, and a return torsion spring is provided at the roller 7, which applies a winding restoring force to the screen under normal conditions. The free end of the second auxiliary screen 4 extends outward from the roll and is attached to the side of the main screen 2 away from the first auxiliary screen 3 through a connector. When the main screen 2 slides along the first direction and moves towards the first auxiliary screen 3, the main screen 2 will pull the free end of the second auxiliary screen 4 to move accordingly, thereby gradually pulling the second auxiliary screen 4 out of the roll and unfolding it; when the main screen 2 slides in the opposite direction, the second auxiliary screen 4 can automatically rewind and be stored under the action of the return torsion spring. Furthermore, during the movement of the main screen 2 along the first direction, the second auxiliary screen 4 can be kept in a state of being pulled and tensioned under the action of the torsion spring, so as to maintain the continuity and integrity of the entire filter surface. The width of the screen surface of the second auxiliary screen 4 is the same as or approximately the same as the width of the screen surface of the main screen 2, and its screen hole diameter is also the same as that of the main screen 2.

[0045] In this embodiment of the invention, the locking assembly includes a first locking member 5 and a second locking member 6 that are independent of each other. The first locking member 5 is used to fix the main screen 2 relative to the frame 1 after the main screen 2 slides to the target position. The second locking member 6 is used to restrict the extension or retraction of the second auxiliary screen 4. The two locking members operate independently and do not interfere with each other.

[0046] In the initial working state, the main screen 2 is fixed to the frame 1 in its initial position by the first locking member 5. At this time, the first main screen area 201 is directly opposite the discharge port of the feeding chute. After stainless steel shot falls from above, it lands directly on the first main screen area 201. Shot of the correct size passes through the screen holes and continues to fall into the next system, while damp and clumped steel shot clumps, woven fragments from ton bags, cable ties, and other debris are trapped above the screen surface and periodically cleaned and removed by the operator. At the same time, the first auxiliary screen 3 is located on one side of the main screen 2. It only partially overlaps or does not overlap with the main screen 2 in the projection direction. It does not undertake the main filtration task; only splashed steel shot falls on it and is filtered. The second auxiliary screen 4 is in a rolled-up state, with its free end connected to the edge of the main screen 2, but it is not pulled out and unfolded. The entire screening process proceeds stably, and the steel shot flow continuously impacts the first main screen area 201, which becomes the most concentrated area of ​​wear in the entire screen.

[0047] With the accumulation of usage time, such as Figure 4 , Figure 5As shown, the first main screen area 201, due to long-term direct impact from the steel shot flow, experiences gradual wear and thinning of its screen wire diameter, eventually leading to localized breakage or mesh expansion and deformation. Therefore, firstly, the locking effect of the first locking member 5 on the main screen 2 is released, allowing the main screen 2 to slide along the first direction; then, the main screen 2 is pushed along the first direction, causing it to translate a certain distance towards the first auxiliary screen 3. This translation distance is determined based on the actual size of the damaged area and the preset compensation position, and is typically set to be equal to the width of a single main screen area along the first direction. When the main screen 2 slides to the target position, as... Figure 5 As shown, the previously damaged first main screen area 201 is moved above the first auxiliary screen 3, and the two overlap in the vertical projection direction. Since the first auxiliary screen 3 and the main screen 2 are staggered in the second direction, the overlapping part exactly covers the entire area of ​​the damaged first main screen area 201. At this time, if steel shot falls from the damaged mesh or break, it must immediately pass through the corresponding mesh hole on the first auxiliary screen 3. Since the two have the same aperture, the overlapping part constitutes a double-layer screen filtration structure. The intact mesh surface of the first auxiliary screen 3 compensates for the damaged part of the first main screen area 201, so that the area can still intercept debris and prevent leakage.

[0048] During this process, the second main screen area 202, which was originally in a standby state, is moved horizontally along with the main screen 2 and sent directly below the discharge port, replacing the damaged first main screen area 201 as the new main filtration area. Subsequently, the impact point of the steel shot flow falls on the intact second main screen area 202, and the wear is transferred to this new area, while the originally damaged first main screen area 201 is removed from the discharge point and no longer bears direct impact, existing only as a compensation layer overlapping with the first auxiliary screen 3.

[0049] During the forward movement of the main screen 2, an exposed gap is created between the other side of the main screen 2 (the side away from the first auxiliary screen 3) and the frame 1. The width of this gap is equal to the sliding distance of the main screen 2. Without intervention, steel shot will fall directly from this gap without being filtered by the screen. At this time, because the frame of the main screen 2 drives the free end of the second auxiliary screen 4 to move synchronously through the connecting piece, the second auxiliary screen 4 is pulled out of the drum and unfolded to the corresponding length, just covering the exposed gap. The unfolded second auxiliary screen 4 is connected end to end with the main screen 2, and its screen holes are the same as those of the main screen 2. This ensures that steel shot falling from this gap must also pass through the screen holes of the second auxiliary screen 4, thus ensuring that there are no blind spots in the entire discharge port coverage area. Finally, the first locking piece 5 is tightened again to fix the main screen 2 in the current sliding position. At the same time, the second locking piece 6 restricts the rotation of the roll 7 of the second auxiliary screen 4 to prevent it from rewinding under tension and maintain the stability of the unfolded state. At this point, the adjustment operation is complete and the screening operation can continue.

[0050] Similarly, the second main screen area 202, as the new main filtration area, will bear the main impact and wear of the steel shot flow. After the second main screen area 202 also shows similar damage, the main screen 2 can be pushed again according to the above operation steps to move the damaged second main screen area 202 to the first auxiliary screen 3 for overlap compensation, and the next second main screen area 202 is switched to the area below the material drop point as the new main filtration area. At the same time, the second auxiliary screen 4 is further unfolded to compensate for the new gap generated by the new round of sliding.

[0051] Once all the main screen areas arranged along the first direction on the main screen 2 have been used and damaged, simply release the first locking piece 5, pull the entire main screen 2 out of the frame 1, and replace it with a brand new main screen 2 to restore the initial state. The first auxiliary screen 3, because it does not directly or minimally bears the impact of falling material, experiences far less wear than the main screen areas. Similarly, the second auxiliary screen 4 is only pulled out to cover the edge gap each time the main screen 2 slides, undertaking the auxiliary filtration task, and also experiences minimal wear. Therefore, during multiple replacements of the main screen 2, the replacement frequency of the first auxiliary screen 3 and the second auxiliary screen 4 can be reduced, allowing them to be reused for a long period.

[0052] The first main screen area 201, each of the second main screen areas 202, the first auxiliary screen 3, and the second auxiliary screen 4 all maintain the same screen aperture diameter. This ensures that, during operation, the particle size threshold of steel shot passing through any screen area remains consistent, preventing differences in aperture diameter between areas from affecting screening accuracy or causing the mis-interception of qualified shot. Simultaneously, the surfaces of each screen can be cleaned periodically to remove trapped clumps and debris, maintaining screen permeability. Furthermore, the frame 1 is equipped with markings or scale lines to quickly identify the single sliding distance of the main screen 2. This ensures the corresponding main screen area is positioned correctly and that the screen apertures in the corresponding area of ​​the main screen 2 align and connect with the screen apertures on the first auxiliary screen 3, preventing interference caused by misalignment.

[0053] This embodiment achieves the sequential take-over of the main filtration task by each area of ​​the main screen 2 without changing the material drop position, and uses the auxiliary screen for damage compensation and edge coverage. This not only ensures the integrity and reliability of filtration, but also extends the service life of the screen and reduces maintenance costs and material waste.

[0054] In one embodiment, the main screen 2 and the second auxiliary screen 4 are detachably connected, and the second auxiliary screen 4 enters the slide groove as the main screen 2 slides, thus slidingly engaging with the slide groove. Specifically, to facilitate the replacement of the main screen 2 and, after a period of time, to facilitate the replacement of the second auxiliary screen 4, the two are detachably connected by a connector, such as a pin or bolt. Furthermore, when the main screen 2 pulls the second auxiliary screen 4 to gradually unfold, the main screen 2 can also enter the slide groove and slide a distance within it, keeping it on the same plane as the main screen 2 to ensure its flatness. Of course, there can be two slide grooves arranged symmetrically.

[0055] like Figure 6 As shown, in one embodiment, the first locking member 5 includes a pressure block 501 and a rod 502. The pressure block 501 is removably attached to the main screen 2, and the rod 502 is movably connected to the frame 1 to press or release the pressure block 501. Specifically, the pressure block 501 is made of a rigid metal block and is removably fixed to the frame of the main screen 2 near the edge of the frame 1 by direct pressing or fastening bolts or buckles. During installation, the pressure block 501 protrudes a predetermined distance outward from the frame, and its outer end face is machined into a flat bearing surface for the rod 502 to apply force. The installation position of the pressure block 501 on the frame can be adjusted according to the overall stroke range of the main screen 2. When the main screen 2 needs to be replaced after long-term use, the pressure block 501 can be removed from the old screen and reinstalled in the corresponding position on the new screen for reuse.

[0056] Furthermore, the rod 502 is movably hinged to the frame 1 via a pivot, allowing it to swing about the pivot in a vertical plane. Specifically, the frame 1 is fixedly equipped with a support base, the pivot passes through the support base, one end of the rod 502 is sleeved on the pivot to form a rotatable connection, and the other end extends outward as a pressing end. When the rod 502 rotates about the pivot, its pressing end gradually approaches and eventually presses against the bearing surface of the pressure block 501; as the rod 502 continues to rotate to the locked position, it tightly presses the main screen 2 against the frame 1, relying on the static friction between the two to firmly restrict the main screen 2 to its current sliding position, preventing it from moving along the first direction. When it is necessary to unlock the main screen 2 to adjust its position, simply rotate the rod 502 in the opposite direction to restore the main screen 2 to its free sliding state along the first direction. In addition, to prevent the rod 502 from accidentally loosening in the vibrating environment of the equipment, a limit pin or spring clip can be installed on the frame 1. When the rod 502 is moved to the locked position, the limit pin can automatically pop out and lock the handle end of the rod 502, providing additional anti-loosening protection. When unlocking, the limit pin must be moved first and then the rod 502 is lifted to ensure the reliability and safety of the locking operation. In this way, the main screen 2 can be quickly locked and released by hand without the need for complicated tools, which not only ensures the stability of the screen position under high impact conditions, but also simplifies the adjustment operation steps when switching between damaged areas.

[0057] Preferably, such as Figure 6 As shown, the first locking member 5 also includes a handle 503, and the rod 502 moves in two different directions under the constraint of the handle 503. Specifically, when it is necessary to lock the main screen 2, the handle 503 is pushed forward, and the rod 502 gradually moves towards the position of the pressure block 501, and its locking end is pressed against the pressure block 501, or inserted into the limiting hole of the pressure block 501. At this time, the main screen 2 is initially positioned by the rod 502. Conversely, when it is necessary to unlock, the handle 503 is pulled backward, and the rod 502 retracts, causing its locking end to be removed from the pressure block 501, or completely pulled out from the limiting hole.

[0058] Thus, the handle 503 converts the operation into the movement of the rod 502 in the corresponding direction. Pushing upwards and forwards allows the rod 502 to press the pressure block 501, while pulling downwards and backwards releases the pressure block 501. This facilitates the detachable fixing of the main screen 2 to the frame 1. The entire process is simple and convenient for moving and replacing the main screen 2. Of course, multiple first locking members 5 can be provided to apply force to different parts of the main screen 2 to ensure its stability in the filtration state.

[0059] like Figure 7As shown, in one embodiment, multiple guide wheels 8 are spaced apart along the outer circumferential surface of the roll 7, and the multiple guide wheels 8 are rotatably connected to the frame 1. Specifically, the second auxiliary screen 4 is wound around the roll 7 to form a roll, and the roll 7 is rotatably connected to the bearing seats provided on the frame 1 through journals at both ends, so that the roll 7 can rotate freely around its own axis. To ensure that the second auxiliary screen 4 can move smoothly and steadily in a predetermined direction when it is pulled and unfolded by the main screen 2, and to avoid the screen from tilting, wrinkling, or scraping against the edge of the frame 1 during unfolding, multiple guide wheels 8 are spaced apart along the outer circumferential surface of the roll 7 and parallel to the axis of the roll 7. Specifically, a bracket is fixedly installed on the frame 1. The bracket is located below or to the side of the roll 7, and its extension direction is consistent with the axis of the roll 7. Multiple mounting seats are evenly distributed on the bracket, and the number and spacing of each mounting seat are determined according to the width of the second auxiliary screen 4. Each guide wheel 8 is rotatably connected to the corresponding mounting seat through a rotating shaft. When the second auxiliary screen 4 is unrolled from the drum, as the screen extends from the lower cutting point of the drum 7, each guide wheel 8 rotates and fits against the drum 7 to generate rolling friction and reduce resistance during the unrolling process.

[0060] Of course, multiple guide wheels can also be provided for the second auxiliary screen 4. For example, in the initial winding state, the second auxiliary screen 4 is tightly wound on the reel 7. At this time, the screen and each guide wheel maintain only slight contact or no contact, and the guide wheels are in a free standby state. When the main screen 2 slides along the first direction and pulls the free end of the second auxiliary screen 4 forward, the reel 7 is forced to rotate and unwind under the pull of the screen to overcome the resistance of the return torsion spring. The unfolded screen is then sequentially introduced into the grooves of each guide wheel. Since the guide wheels are spaced apart along the axial direction of the reel 7, their combined action can evenly unfold the screen in the width direction, preventing the screen from developing a wavy twist or being loose on one side and tight on the other due to uneven local force. Meanwhile, the guide wheels' constraint on the screen ensures that the unfolded screen is parallel to the screen surface of the main screen 2 and maintains a flat and taut shape. This allows for controllable relative positioning between the screen surface and the main screen 2 when the screen covers the gap exposed after the main screen 2 slides, preventing gap leakage caused by screen warping or sagging. Conversely, when the main screen 2 slides in the reverse direction or when the second auxiliary screen 4 needs to be retrieved, the reset torsion spring drives the reel 7 to rotate in the reverse direction, rewinding the unfolded screen onto the drum. During this process, the guide wheels also play a guiding and sorting role, ensuring that the screen is evenly and flatly wound onto the reel 7 during retrieval, avoiding jamming or folding during the next unfolding due to overlapping or misalignment. In addition, the guide wheel and the frame 1 are rotatably connected by bearings, which can reduce the frictional loss between the screen and the guide wheel during the unwinding and rewinding of the roll 7. This not only extends the service life of the second auxiliary screen 4, but also reduces the traction force that the main screen 2 needs to overcome when sliding, so that the main screen 2 can be pushed to complete the position switching with a smaller force.

[0061] Meanwhile, each guide wheel 8 rotates independently. Even if one of the guide wheels 8 is worn or damaged due to long-term use, only that guide wheel 8 needs to be replaced. There is no need to replace the entire bracket or adjust other guide wheels 8. The maintenance cost is low and the operation is simple.

[0062] Preferably, such as Figure 7 As shown, in one embodiment, the second locking member 6 includes a threaded rod 601, which is threadedly connected to the frame 1 for contacting or separating from the reel 7. Specifically, a threaded seat is provided on the frame 1 near the end of the reel 7. The threaded seat protrudes outward from the surface of the frame 1 and has an internally threaded through hole extending perpendicular to the axis of the reel 7. The threaded rod 601 is a round metal rod with matching external threads machined on its outer wall. It passes through the internally threaded through hole of the threaded seat and forms a threaded engagement with the internally threaded through hole. The axis of the threaded rod 601 points towards the outer circumferential surface or the end face of the reel 7, so that the threaded rod 601 can move linearly along its own axis toward the reel 7 during screwing.

[0063] One end of the threaded rod 601 extends to the outside of the threaded seat and is fixedly connected to an operating knob. The diameter of the operating knob is larger than the diameter of the threaded rod 601, and its outer circumferential surface is knurled or has radially distributed wrench slots for gripping and applying force or using a wrench for rotation. The end of the threaded rod 601 facing the reel 7 is the abutment end. This abutment end can be set as a smooth hemispherical end face or a conical end face, or a friction pad made of wear-resistant rubber or polyurethane can be embedded and fixed at this end to increase the contact area and friction coefficient during abutment, while avoiding indentations or scratches on the surface of the reel 7 caused by rigid abutment.

[0064] When it is necessary to lock the reel 7 to limit the unfolding or retraction of the second auxiliary screen 4, hold the operating knob and rotate the threaded rod 601. Guided by the threaded pair, the threaded rod 601 gradually advances towards the reel 7 along its own axis, and the contact end gradually approaches and finally presses tightly against the outer circumferential surface of the reel 7. As the threaded rod 601 continues to rotate, the positive pressure between the contact end and the reel 7 continues to increase, thereby generating a sufficiently large static friction force between the contact surface of the contact end and the reel 7, thus locking the reel 7 at the current angle position, preventing it from rotating autonomously under the restoring force of the return torsion spring, and also preventing it from being passively unwound under external traction. At this time, the unfolded length of the second auxiliary screen 4 is fixed and will not unexpectedly extend or retract due to vibration during equipment operation or impact from steel shot on the screen.

[0065] When it is necessary to release the lock of the reel 7 to allow the main screen 2 to continue sliding and to further unfold the second auxiliary screen 4, simply hold the operating knob and turn the threaded rod 601 in the opposite direction. The threaded rod 601 then retracts along its own axis away from the reel 7, completely eliminating the contact pressure between the contact end and the outer circumference of the reel 7, separating the contact end from the reel 7 and preventing them from contacting each other. Afterward, the reel 7 returns to a free-rotating state and can be unwound under external force or wound up under the action of the return torsion spring.

[0066] On the one hand, the self-locking property of the threaded drive allows the threaded rod 601 to maintain a locked state through friction of the threaded pair itself after it abuts against and presses the reel 7, without the need for external force. It will not loosen due to vibration, eliminating the need for additional anti-loosening components, resulting in a compact and reliable structure. On the other hand, the clamping force between the abutting end and the reel 7 can be adjusted by controlling the amount of threaded rod 601's screw advance, thereby adjusting the frictional torque to meet the locking strength requirements of the reel 7 under different working conditions. Furthermore, the threaded rod 601 experiences minimal wear after mating with the threaded seat; after long-term use, only the threaded rod 601 or the friction shim needs to be replaced to restore locking performance, making maintenance convenient and cost-effective.

[0067] like Figure 7As shown, the frame 1 is provided with a groove 9 that can accommodate the scroll 7, and the groove 9 is covered by a stop 602 rotatably connected to the frame 1. The stop 602 abuts against or separates from the scroll 7. In this embodiment, if the scroll 7 needs to be fixed in multiple directions, multiple threaded rods 601 need to be provided along its outer circumference. However, to simplify the operation, a stop 602 is rotatably provided on the frame 1. By rotating the stop 602 in both directions, the stop 602 abuts against or separates from the surface of the scroll 7. By setting the stop 602 and the threaded rods at different positions on the scroll 7, double locking can be achieved. Of course, to further simplify the operation, the threaded rod can be set on the stop 602. After rotating the stop 602 to press the scroll 7, the threaded rod 601 located on the stop 602 can be rotated. Therefore, depending on the processing requirements, the threaded rod 601 and the stop block 602 can be selected to lock the scroll 7, or the two can be combined to lock the scroll 7 simultaneously, so as to improve the stability of the scroll 7.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A feeding device for a shot blasting machine, characterized in that, include: Frame; The main screen is slidably connected to the frame along a first direction and has a first main screen area and at least one second main screen area arranged sequentially along the first direction. An auxiliary screen assembly includes a first auxiliary screen and a second auxiliary screen respectively disposed on both sides of a main screen along a first direction. The first auxiliary screen is attached to the frame and is staggered with the main screen along a second direction perpendicular to the first direction, so as to form a continuously variable overlapping portion with the main screen when the main screen slides. The overlapping portion covers the first main screen area and selectively covers one or more second main screen areas located behind the first main screen area as the sliding displacement increases. The second auxiliary screen is wound into a cylinder shape, and its free end is attached to the main screen to at least partially unfold the second auxiliary screen. The first main screen area, the second main screen area, the first auxiliary screen, and the second auxiliary screen all have multiple screen holes of the same aperture. as well as The locking assembly includes a first locking member and a second locking member that are independent of each other, and the first locking member and the second locking member are respectively configured to restrict the sliding of the main screen and the second auxiliary screen.

2. The feeding device for a shot blasting machine as described in claim 1, characterized in that, The frame is provided with a sliding groove along the first direction, and the main screen is slidably disposed in the sliding groove.

3. The feeding device for a shot blasting machine as described in claim 2, characterized in that, The main screen and the second auxiliary screen are detachably connected, and the second auxiliary screen enters the groove as the main screen slides, so as to slide and cooperate with the groove.

4. The feeding device for a shot blasting machine as described in any one of claims 1-3, characterized in that, The first locking element includes a pressure block and a rod. The pressure block is removably attached to the main screen, and the rod is movably connected to the frame to press or release the pressure block.

5. The feeding device for a shot blasting machine as described in claim 4, characterized in that, The first locking element also includes a handle, under the constraint of the handle, the rod can move in two different directions.

6. The feeding device for a shot blasting machine as described in claim 1, characterized in that, The second auxiliary screen is wound around a reel, which is rotatably connected to the frame.

7. The feeding device for a shot blasting machine as described in claim 6, characterized in that, Multiple guide wheels are spaced apart along the outer circumference of the reel, and the multiple guide wheels are rotatably connected to the frame.

8. The feeding device for a shot blasting machine as described in claim 6, characterized in that, The second locking element includes a threaded rod that is threadedly connected to the frame and is used to abut or separate from the reel.

9. The feeding device for a shot blasting machine as described in any one of claims 6-8, characterized in that, The frame is provided with a groove for accommodating the scroll, and the groove is covered by a stop block rotatably connected to the frame, the stop block abutting against or separating from the scroll.

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