Shot blasting chamber top sealing device and shot blasting chamber

Abstract

The application discloses a top sealing device of a shot blasting chamber and the shot blasting chamber. The top sealing device of the shot blasting chamber comprises a guard plate, a drive device and a driving arm. The guard plate is provided with a guide inlet which is open to the side where the first long plate edge is located at a predetermined position of the first long plate edge. The drive device is located at the second side of the outer opening of the shot blasting chamber. The end of the driving arm is hinged to the back side of the guard plate. The hinged position of the guard plate and the driving arm is offset to the second long plate edge. The driving arm is a rocker arm which is hinged to the predetermined position of the second side of the opening. The top sealing device of the shot blasting chamber according to the embodiment of the application has relatively good sealing performance and relatively compact structure.

Description

Top sealing device of shot blasting chamber and shot blasting chamber Technical Field

[0001] This invention relates to a top sealing device for a shot blasting chamber, and further to a shot blasting chamber equipped with the top sealing device. Background Technology

[0002] Shot blasting machines are generally through-type shot blasting machines. The term "through-type" can be simply understood as the shot blasting chamber having an opening at the top for the lifting device to pass through. This opening can be understood as an elongated hole, with the extension direction of the opening corresponding to the direction of workpiece flow. Since the conveying device (also known as the power unit, generally a conveyor chain, also called a overhead chain) for transporting the lifting device is located outside the shot blasting chamber, the opening is mainly used for the lifting device's boom to enter the shot blasting chamber from outside. The consideration is that shot will fly out of the shot blasting chamber, and shot blasting will generate dust and debris, affecting the operation and service life of the lifting device's power equipment. Therefore, the power unit needs to be located outside the shot blasting chamber. Because the shot will reflect off the workpiece, and because the workpiece surface shape is not uniform and the workpiece's posture is not fixed (generally requiring rotation around the boom axis), the reflection direction of the shot cannot be effectively controlled. In other words, the flight direction of the shot after hitting the workpiece is scattered. Without protection, some reflected shot will fly out from the opening.

[0003] Note: Although the lifting device does not use hook-shaped components to suspend the workpiece, shot blasting machines that suspend workpieces in this manner are generally referred to in the art as hook-type shot blasting machines.

[0004] The problem of shot flying out from the top of a hook-type shot blasting machine is a well-known issue in the field, and it has been described relatively thoroughly in many technical documents. Typically, Chinese patent document CN114877072A discloses an anti-shot-flying sealing device and a shot blasting machine. In this patent document, the shot blasting machine has a chamber with a groove at the top; the groove in this patent document is the aforementioned opening. The anti-shot-flying sealing device includes a flexible sealing component and a rigid sealing component. The main body of the flexible sealing component is a herringbone-shaped seal formed by two herringbone seals facing each other on both sides of the groove. There are two herringbone seals facing each other vertically, and a horizontally placed brush (also called a brush bar) is placed between the two herringbone seals. According to this structure, when the boom passes through, it can push open the current position of the herringbone seal or the brush. After passing through, due to the restoring force, the herringbone seal returns to its closed state, and the brush does the same, thereby achieving a seal that allows the boom to pass through.

[0005] The rigid sealing assembly is located in the space below the flexible sealing assembly. The rigid sealing assembly includes a horizontally arranged first sealing plate and a vertically arranged second sealing plate. The first sealing plate is divided into left and right parts and is located on both sides of the slide groove. The vertically arranged second sealing plate is also divided into left and right parts and is located on both sides of the slide groove. The rigid sealing assembly is located inside the slide groove. In other words, the rigid sealing assembly provides a non-contact seal with the boom. By constructing the shape of the vertically arranged second sealing plate, a labyrinth seal can be constructed.

[0006] Currently, most hook-type shot blasting machines employ a top seal constructed using rigid and / or flexible sealing components as described in Chinese patent document CN114877072A, with some variations in construction methods. Furthermore, CN114877072A adds a left-right separated protective cover above the flexible sealing component to improve the top sealing capability. This structure is relatively complex. The inventors believe that the excessive emphasis on dynamic sealing in existing hook-type shot blasting machines not only makes the sealing structure overly complex but also results in generally poor sealing performance for dynamic seals, such as labyrinth seals, which are non-contact seals with gaps between the sealing interfaces. CN114877072A also explains that the flexible sealing component is placed above the rigid sealing component to further block shot leaking from the rigid sealing component. In other words, even with a dynamic sealing structure, a small amount of shot can still escape from the rigid sealing component. Therefore, an overemphasis on dynamic sealing inevitably leads to insufficient sealing capability.

[0007] Furthermore, the lifting devices on hook-type shot blasting machines are generally mounted on the drive chain, with a dozen or more lifting devices often on a single chain loop. The main reason why existing technology emphasizes dynamic sealing is to ensure the continuous operation of the drive chain. However, it should be understood that the shot blasting time for each workpiece is fixed. If shot blasting is performed while the workpiece is being dynamically transported, the shot blasting chamber needs to be relatively long in the direction of the chain to meet the shot blasting time required during dynamic workpiece transport. If the size of the shot blasting chamber is reduced by decreasing the drive chain speed, anyone with basic experience should understand that power consumption under low-speed conditions is often very high, and the economical operating speed of power equipment is usually not low.

[0008] Note: Regarding shot blasting time, removing surface dust or burrs from castings typically takes 2-5 minutes; removing rust from welded parts generally takes about 10 minutes. In many applications, shot blasting time is usually greater than 10 minutes, and some rough shot blasting can reach 40 minutes. Therefore, the inventors believe that the necessity of ensuring continuous operation of the transmission chain is not substantial.

[0009] Furthermore, one of the factors considered in the known top sealing devices of shot blasting chambers is the aforementioned lifting rod. Since the lifting device needs to bear weight, and the targets of shot blasting are mainly metal workpieces, considering the versatility of shot blasting chambers, the lifting device generally needs to be designed according to the largest workpiece, resulting in a very thick lifting rod. During use, the lifting rod can push open the sealing device. After being pushed open, the shape of the sealing device will change due to the support of the lifting rod, easily creating a large gap from which steel shot can easily fly out.

[0010] Due to the use of multi-stage sealing, the lifting device experiences very high resistance during operation, and based on friction and extrusion deformation, it is very easy for the vulnerable parts to fail in a relatively short period of time. Summary of the Invention

[0011] In view of this, the object of the present invention is to provide a top sealing device for a shot blasting chamber with relatively good sealing performance and a relatively compact structure. Another object of the present invention is to provide a shot blasting chamber equipped with the top sealing device for the shot blasting chamber.

[0012] According to a first aspect of the present invention, a top sealing device for a shot blasting chamber is provided, disposed at a predetermined opening at the top of the shot blasting chamber, the top sealing device for the shot blasting chamber comprising:

[0013] A protective plate is located in the shot blasting chamber, and the protective plate is a strip plate extending along the opening direction of the long plate edge; the protective plate has an inlet opening at a predetermined position on the first long plate edge for cooperating with a guide rod.

[0014] The drive device is located on the second side of the opening, which is opposite to the first side of the opening where the first long plate is located when the guard plate is in the state of covering the opening; and the drive device is located outside the shot blasting chamber, and the end of the provided drive arm is hinged to the back side of the guard plate, which is the plate surface facing outward when the guard plate is in the state of covering the opening; and the hinge position of the guard plate and the drive arm is offset towards the second long plate side, and is offset from the inlet in the direction of the long plate side by a clearance distance, which is used to avoid the part of the lifting rod assembly located outside the shot blasting chamber;

[0015] The drive arm is a rocker arm hinged to a predetermined position on the second side of the opening.

[0016] Optionally, the drive arm is an arc-shaped arm;

[0017] The side where the center of the arc-shaped arm is located is the side where the top of the shot blasting chamber is located.

[0018] Optionally, the drive arm is hinged in the shot blasting chamber using a main hinge support at a predetermined height, the height of which is 0.8 to 1.3 times the inner arc height of the drive arm;

[0019] The distance between the main hinge support and the second side edge of the opening is 0.55 to 0.75 times the inner arc chord length of the drive arm.

[0020] Optionally, a guide arm is provided on each side of the drive arm;

[0021] The guide arm is parallel to the drive arm and has the same swing radius;

[0022] Correspondingly, the end of the guide arm is hinged to the back side of the guard plate, and the hinge point of the guide arm on the back side of the guard plate and the hinge point of the drive arm on the back side are located on a first line, which is parallel to the edge of the first long plate.

[0023] The starting end of the guide arm is hinged outside the shot blasting chamber. The hinge point of the guide arm and the drive arm outside the shot blasting chamber are located on a second line, which is parallel to the edge of the first long plate.

[0024] Optionally, the drive device further includes drive components selected from the following:

[0025] A swing cylinder, wherein the drive arm is connected to the swing arm of the swing cylinder;

[0026] A swing motor, wherein the drive arm is connected to the swing arm of the swing motor;

[0027] A crank-rocker mechanism, wherein the drive arm constitutes the rocker arm of the crank-rocker mechanism;

[0028] A double-crank mechanism, wherein the drive arm constitutes one crank of the double-crank mechanism.

[0029] A triangular mechanism in which the driven rocker arm and the driving arm are connected as one unit, forming a lever with two parts separated by a lever hinge support, which is the hinge support of the driving arm hinged outside the shot blasting chamber; or

[0030] The gear and rack mechanism has a gear shaft that forms a hinge shaft for the drive arm mounted outside the shot blasting chamber; the corresponding rack is driven by a linear power component.

[0031] Optionally, the width of the protective plate is greater than the width of the opening, and the protective plate overlaps on both sides when it covers the opening.

[0032] Optionally, the overlap on the second side is less than or equal to the overlap on the first side.

[0033] Optionally, the inlet is an isosceles triangle with a rounded apex.

[0034] The diameter of the round head is larger than the diameter of the boom, and there is a gap between the round head and the boom, which is less than or equal to the diameter of the projectile.

[0035] Optionally, left and right rubber plates are provided on both sides of the waist of the inlet;

[0036] The corresponding left and right rubber plates are mated together, and an inlet is formed at the rod extrusion inlet. An arc-shaped opening is formed at the mating end to assemble with the round head to form an intervention port. This intervention port forms a shaft hole fit with the rod.

[0037] According to a second aspect of the present invention, a shot blasting chamber is provided, including the top sealing device of the shot blasting chamber described in the first aspect of the present invention, wherein the portion of the suspension rod of the shot blasting chamber located outside the shot blasting chamber has a cover plate to cover the inlet from above;

[0038] A reserved distance is left between the cover plate and the protective plate, and a corresponding bristle is provided below the cover plate to fill the reserved distance.

[0039] In embodiments of the present invention, the provided top sealing device for the shot blasting chamber provides a sealing method primarily using rigid components as seals. Specifically, it provides a protective plate, to which the drive arm of the drive device adapted for the protective plate is hinged to the back side of the protective plate, and the hinge position is offset towards a second side. This second side is one of the two sides of the opening, with the opening as the reference frame, and the drive device is located on the second side. In other words, the drive arm extends from the second side. When the drive arm suspends the protective plate, due to the offset of the hinge point between the drive arm and the protective plate towards the second side, the protective plate is approximately vertical under the influence of gravity. When the drive arm pulls up the protective plate, the second long plate edge of the protective plate (i.e., the long plate edge located on the second side) first abuts against the inner surface of the top of the shot blasting chamber. Then, the drive arm moves further upward, and the protective plate rotates about the second long plate edge as an axis until the edge of the first plate edge on the front side of the protective plate abuts against the inner surface of the top of the shot blasting chamber, thereby completing the shielding of the opening. Prior to this, the current boom is already in place. When the guard plate is positioned (i.e., during the process of reaching the opening), the inlet allows the guard plate to move aside from the boom and eventually cooperate with the guide rod without affecting the normal operation of the boom. After shot blasting is completed, the guard plate returns to its original position, allowing the opening to be cleared, and the boom can continue to move forward along the opening. Since the guard plate is a rigid plate under these conditions, the resulting seal is essentially achieved by a rigid component, preventing gaps caused by seal compression deformation, thus achieving a more reliable seal. For the inlet, since the portion of the boom assembly located outside the shot blasting chamber generally has a large area, such as a disc-shaped boom seat, it can fold down to close the portion of the inlet except for the portion occupied by the boom, thus satisfying the sealing of the inlet. However, it should also be understood that a rigid, non-contact seal between the boom and the guard plate can also be provided on the boom to directly block the inlet. As can be seen from the above description, in the embodiments of the present invention, the overall structure of the shot blasting chamber top sealing device is relatively compact, and the sealing part mainly includes a rigid guard plate, which has a simple structure and is not prone to failure. Attached Figure Description

[0040] Figure 1 is a schematic diagram of the main structure of the top sealing device of the shot blasting chamber in one embodiment. The solid line in the figure represents the reset state of the top sealing device of the shot blasting chamber, and the double-dotted line represents the set state.

[0041] Figure 2 is a top view of the top sealing device of the shot blasting chamber in one embodiment.

[0042] In the diagram: 1. Top plate, 2. Hinge support, 3. Hydraulic cylinder, 4. Push rod, 5. Connecting rod, 6. Hinge shaft, 7. Hinge shaft, 8. Hinge support, 9. Drive arm, 10. Hoisting rod, 11. Self-transforming sprocket, 12. Sealing cover, 13. Hairline, 14. Opening, 15. Hinge shaft, 16. Protective plate, 17. Hook, 18. Hinge shaft, 19. Guide arm, 20. Through hole, 21. Rubber sealing plate, 22. Hinge shaft, 23. Screw, 24. Guide port, 25. Sealing line. Detailed Implementation

[0043] It should be understood that the top of the shot blasting chamber is provided with an opening 14, which is basically an elongated opening extending along the material flow direction of the shot blasting chamber, so that a conveyor chain located outside the shot blasting chamber can partially enter the suspension rod 10 inside the shot blasting chamber through the opening 14.

[0044] The direction of extension of the opening 14 is usually called the longitudinal direction, which is also the direction of material flow, and therefore has a definite front-to-back orientation, i.e., the orientation corresponding to the longitudinal direction. The direction perpendicular to the longitudinal direction in the reference plane is also called the left-to-right direction, which is also called the width direction.

[0045] It should be understood that the direction perpendicular to the reference plane is generally called the up and down direction. In the embodiments of the present invention, the up and down direction is usually the vertical direction, and the reference plane is usually the horizontal plane.

[0046] In embodiments of the present invention, unless otherwise specified, the front, back, left, right, up, and down directions are based on the reference system determined by the aforementioned opening.

[0047] It should be noted that the boom 10 passes through the opening 14 approximately in the left-right direction. Therefore, the through hole 20 on the guard plate 16 is approximately located in the middle of the left-right direction of the guard plate 16. This obvious correspondence will not be described in detail.

[0048] It should also be understood that since covering the opening 14 is a necessary condition, the protective plate 16 needs to have a larger width. When the protective plate 16 covers the opening 14, part of the protective plate 16 will overlap with the top of the shot blasting chamber. For ease of description, the boundary of the overlap is marked with a double-dotted line in Figure 2, namely the sealing line 25 shown in the figure.

[0049] As described in the background section, the main sealing structure of a conventional shot blasting chamber top sealing device is a flexible sealing structure, while in the embodiments of the present invention, a rigid sealing structure is the primary feature. It should be understood that since the shot blasting chamber is equipped with a dust removal system, the chamber is generally under negative pressure, and the probability of dust penetrating through the top sealing device is low. Therefore, the top sealing device is mainly used to prevent excessive shot from flying out of the chamber through the opening 14, rather than to prevent dust overflow. Thus, a rigid sealing structure offers better technical advantages; even with a non-contact seal, the requirement for top sealing capability of the shot blasting chamber can still be met because the shot being prevented from flying out has a certain particle size.

[0050] Furthermore, it should be understood that the flight of projectiles is disordered, meaning that very few projectiles fly strictly vertically. In other words, even if the sealed gap is equal to the diameter of the projectile, it is difficult for the projectile to fly out of the sealed gap.

[0051] A typical shot blasting chamber has a rigid roof, allowing for the installation of equipment, including a top sealing device. Positionally, this sealing device is located at a pre-designated opening 14 at the top of the chamber. Traditionally, the main body of this sealing device is situated within the opening 14, requiring a certain vertical dimension for a multi-stage sealing structure to ensure proper sealing. However, in this embodiment, the sealing device primarily comprises a protective plate 16, eliminating specific requirements on the depth of the opening 14; the opening 14 simply maintains the thickness of the steel plate at the top of the shot blasting chamber. Even with the installation of, for example, an inner liner, this configuration of the opening 14 does not increase its relative thickness to the top of the shot blasting chamber.

[0052] Since the opening 14 can be understood as an elongated hole, and its extension direction is generally straight, in other words, for example, the part of the conveyor chain adapted to the shot blasting chamber is generally a straight chain segment. The corresponding guard plate 16 only needs to be able to cover the opening 14. The guard plate 16 is adapted to the opening 14 with a certain width and is manifested as a rectangular plate with a relatively large length-to-width ratio.

[0053] However, it should be noted that the shielding of the opening 14 is only used to indicate the state, and does not mean that only a single protective plate 16 is needed for shielding. The number of protective plates 16 that fit the opening 14 is consistent with the number of workpieces in the shot blasting chamber at the same time. Therefore, the aspect ratio of the protective plate 16 is usually much smaller than that of the opening 14. Even in the application with only one protective plate 16, considering the overlap described by the sealing line 25 in Figure 2, the aspect ratio of the protective plate 16 is still smaller than that of the opening 14.

[0054] Even without considering that the length of the opening 14 is much greater than the width of the opening 14, the corresponding guard plate 16 will have obvious slat characteristics. Slats often have significant length and width characteristics, relatively weak thickness characteristics, and the length-to-width ratio of the plate is usually relatively large. The structure shown in Figure 2 is just a schematic structure.

[0055] As can be seen from the structure illustrated in Figure 1, the protective plate 16 is arranged in the shot blasting chamber. In the position shown by the double-dotted line in the figure, the protective plate 16 covers the opening 14 from the shot blasting chamber. In the reset position, the protective plate 16 is suspended in a hanging manner and offset to one side of the opening 14 to avoid the lifting rod assembly, so that the lifting rod assembly can run along the opening 14.

[0056] Given the basic concept that the guard plate 16 is configured to cover the mouth 14 during shot blasting, the two long sides of the guard plate 16 must obviously be parallel to the extending direction of the mouth 14, and the width of the guard plate 16 corresponds to the width of the mouth 14.

[0057] As can be seen from the position and reset states of the guard plate 16 in Figure 1 after the boom assembly is in place, the guard plate 16 mainly rotates to its position during the reset process. If there is no inlet on the guard plate 16, the boom 10 of the boom assembly will inevitably interfere with the right edge of the guard plate 16 in the state illustrated in Figure 2, and the guard plate 16 cannot be moved further upward by rotation.

[0058] In view of this, since the boom assembly often needs to be stopped at a specific position for shot blasting, an inlet can be opened at the corresponding position on the guard plate 16 according to the specific position, as shown in Figure 2, which has a through hole 20 and a structure with a rubber sealing plate 21 covering it. This inlet is manifested on the guard plate 16 as an opening on one side, the side that interferes with the boom 10, which is denoted as the first side. Corresponding to one long plate edge of the guard plate 16, this long plate edge is denoted as the first long plate edge, and the other long plate edge of the guard plate 16 is denoted as the second long plate edge.

[0059] Obviously, in the set state, the first long plate edge is located on both sides of the opening 14 relative to the driving device used to drive the guard plate 16 to change position.

[0060] Furthermore, the hinge point between the guard plate 16 and the drive arm 9 is offset to the second side. When the drive arm 9 suspends the guard plate 16, the guard plate 16 will be in a suspended state. Obviously, the suspended state cannot be as vertical as shown in Figure 1, but rather presents a relatively small angle with the vertical plane. This angle does not affect the passage of the lifting rod assembly, and at the same time, it is also conducive to the positioning of the guard plate 16. During the lifting process of the drive arm 9, the second side will first contact the inner surface of the top of the shot blasting chamber. At this time, when the drive arm 9 continues to rise, the guard plate 16 will rotate counterclockwise as shown in Figure 1 until the upper surface of the guard plate 16 contacts the top of the shot blasting chamber.

[0061] Furthermore, the drive device is located on the second side of the opening 14. Obviously, this second side is opposite to the first side of the opening 14 where the first long plate edge is located when the guard plate 16 is in the state of covering the opening 14. That is, the aforementioned side is located on both sides of the opening 14, respectively, with the first long plate edge.

[0062] The drive unit is located on the second side of the opening 14, and the drive arm 9 intervenes in the opening 14 from this second side. From a purposeful perspective, the drive arm 9's basic form of motion is a swinging motion. Taking the structure shown in Figure 1 as an example, in the figure, the drive arm 9 is mounted on the outer surface of the top plate 1 of the shot blasting chamber via a hinge support 8, and has the freedom to swing around the corresponding hinge axis 7. Since the hinge axis 7 is offset on the second side of the opening 14 and located outside the shot blasting chamber, based on the general principle of circular motion, when the drive arm 9 is in the set state, its hinge point with the guard plate 16 is closer to the first side of the opening 14, while in the reset state, it is closer to the second side of the opening 14. At the same time, considering the simplicity of control, when the guard plate 16 is in the reset state, it is directly limited by the edge of the second side of the opening 14.

[0063] For ease of description, the side of the guard plate 16 that is hinged to the drive arm 9 is called the back side, and the side where the back side is located is called the back side. When the guard plate 16 is in the position, the front side that is opposite to the back side must face the shot blasting chamber.

[0064] Furthermore, as shown in Figure 1, the portion of the boom assembly located outside the shot blasting chamber often has a self-rotating sprocket 11, which drives the boom 10 to rotate via a transmission chain that engages with the self-rotating sprocket 11. This causes the workpiece on the hook 17 to be in a self-rotating state during shot blasting inside the chamber, ensuring that all circumferential surfaces are blasted. Therefore, as shown in Figure 2, the inlet is offset by a large range relative to the drive arm 9. This offset is mainly used to avoid the portion of the boom assembly located outside the shot blasting chamber. Since the design basis is clear, and it should be known that the inlet 14 has a relatively long length, it is suitable for a relatively flexible hinge position with the drive arm 9. The specific location of the inlet will not be elaborated further; it is only necessary to avoid the portion of the boom assembly located outside the shot blasting chamber. Those skilled in the art can adapt it according to the selected boom assembly.

[0065] The inlet and the hook assembly are directly related to the stopping position during shot blasting. For ease of description, the positional relationship between the drive arm 9 and the inlet is evaluated by the level of deviation between them. This level of deviation is called the avoidance distance. Obviously, this avoidance distance is used for the drive arm 9 to avoid the part of the boom assembly located outside the shot blasting chamber.

[0066] Furthermore, based on the preceding information, the drive arm 9 is a rocker arm hinged to a predetermined position on the second side of the opening 14. Thus, the projection of the drive arm 9's movement trajectory onto the plane of the opening 14 is a straight line segment. This straight line segment is clearly a straight line segment in the width direction of the opening 14, and it corresponds to two stop points. The first stop point corresponds to the positioned state of the guard plate 16, and the second stop point corresponds to the reset state of the guard plate 16. Under these conditions, considering the shortest possible movement distance, the second stop point allows the drive arm 9 to swing to the opening 14, for example, to the far left in Figure 1. At the first stop point, it is approximately located in the middle of the opening 14 in the left-right direction (it may not be directly in the center). Under these conditions, when in the reset state, the guard plate 16 is approximately offset to the second side in the downward direction of the opening 14, thus easily avoiding the lifting rod assembly.

[0067] To better avoid motion interference during the driving process, the driving arm 9 adopts an arc-shaped arm as illustrated in Figure 1, and the center of the arc-shaped arm is located on the side where the top of the shot blasting chamber is located, i.e., it is arched upwards. Therefore, under this condition, the chord of the driving arm 9 with the arc-shaped structure is located on the lower side, which is the part that may interfere with the edge of the top plate 1 of the determined outlet 14 during the repositioning process of the guard plate 16. The arc shape is equivalent to arching the corresponding part of the driving arm 9 that may interfere, thereby having a better driving form that intervenes from the outside into the shot blasting chamber from the outlet 14.

[0068] To better arrange the drive arm 9 and reduce the difficulty of interference avoidance design, the drive arm 9 is hinged to a main hinge support of a predetermined height outside the shot blasting chamber. The height of the main hinge support is 0.8 to 1.3 times the inner arc height of the drive arm 9. There is an implicit technical condition here: the end of the drive arm 9, that is, the end hinged to the guard plate 16, spends most of its travel within the shot blasting chamber during the process from reset to position. During this process, as shown in Figure 1, the hinge shaft 15 gradually moves closer to the first side of the opening 14 as it rises. The hinge support 8, exemplified in Figure 1, is the main hinge support. Its certain height is more conducive to reducing the rotation angle of the drive arm 9 during the reset to position process and reducing the driving difficulty of the drive arm 9.

[0069] Furthermore, the distance between the main hinge support and the second side edge of the opening 14 is 0.55 to 0.75 times the inner arc chord length of the drive arm 9, thereby reducing the interference of the arc top on the part of the boom assembly located outside the shot blasting chamber.

[0070] As mentioned earlier, the length of the guard plate 16 is relatively long, mainly to accommodate the length of the opening 14. However, it should also be noted that during shot blasting, there may be multiple workpieces in the shot blasting chamber at the same time. The number of workpieces is often positively correlated with the number of lifting rod assemblies. In this case, multiple guard plates 16 can be provided for the same shot blasting chamber. However, considering the size of the workpiece itself, the guard plate 16 still has a relatively large length-to-width ratio. The single hinge of the drive arm 9 is prone to causing the guard plate 16 to become unstable during state changes. In view of this, in the structure illustrated in Figure 2, a guide arm 19 is provided on each side of the drive arm 9. This is equivalent to extending the length of the hinge shaft 15, so that the guard plate 16 is not easy to become unstable during state changes and can be driven smoothly.

[0071] Based on the aforementioned extension of hinge 15, it is required that the guide arm 19 and the drive arm 9 have the same motion pattern. Therefore, the guide arm 19 is parallel to the drive arm 9 and has the same swing radius.

[0072] Correspondingly, the end of the guide arm 19 is hinged to the back side of the guard plate 16, and the hinge point of the guide arm 19 on the back side of the guard plate 16 and the hinge point of the drive arm 9 on the back side of the guard plate 16 are located on a first line, which is parallel to the edge of the first long plate.

[0073] Accordingly, the beginning of the guide arm 19 is hinged outside the shot blasting chamber, and the hinge point of the guide arm 19 and the hinge point of the drive arm 9 outside the shot blasting chamber are located on a second line, which is parallel to the edge of the first long plate.

[0074] Regarding the configuration of the drive unit, in addition to the aforementioned drive arm 9, a power unit and an optional intermediate drive mechanism are also required. Given that the swinging motion of the drive arm 9 is one of the most common forms of motion in the mechanical field, there are relatively many drive components that can be selected, which are briefly described below.

[0075] A common component that can directly output swing is a swing cylinder, which can be a hydraulic cylinder or a pneumatic cylinder. Hydraulic cylinders have high power density, while pneumatic cylinders have fast response speed. Those skilled in the art can choose the appropriate type based on their needs. In addition to fluid cylinders, electrically driven swing motors have also emerged. For drive components that can directly output swing, the drive arm 9 can be directly or indirectly connected to, for example, the swing arm of a swing cylinder.

[0076] In some embodiments, the swing can be output through a crank-rocker mechanism, wherein the drive arm 9 is connected to the corresponding rocker arm. The connection form can be the connection between the connecting rod 5 and the drive arm 9 as illustrated in Figure 1, wherein the connecting rod 5 constitutes the rocker arm in the crank-rocker mechanism.

[0077] The rocker arm can directly output oscillation. Oscillation can also be understood as a special form of rotational motion. In other words, oscillation can be output through rotational motion. Both connecting rods of the double crank mechanism are components that can output rotational motion. Oscillation can be achieved by limiting one of the connecting rods. Therefore, one crank of the double crank mechanism can form the connecting rod 5 as shown in Figure 1.

[0078] Triangular mechanisms are widely used in engineering machinery such as dump trucks. The mechanism shown in Figure 1, which has a cylinder 3 and a connecting rod 5, is a typical triangular mechanism. This type of mechanism has a relatively simple configuration and belongs to a type of hinged four-bar linkage.

[0079] In some embodiments, a rack and pinion mechanism can also be used to output the oscillation, that is, the linear motion of the rack is output to oscillate through the gear meshing with it. Accordingly, the drive arm 9 is mounted on the gear, and the rack can be driven by a linear motion component, such as a hydraulic cylinder, a pneumatic cylinder, or a linear motor.

[0080] In the structure illustrated in Figure 2, the sealing line 25 is marked with a double-dotted line to determine the overlap between the guard plate 16 and the top plate 1 of the shot blasting chamber, thereby achieving a contact seal. In this case, the width of the guard plate 16 is required to be greater than the width of the opening 14, so that an overlap is formed on both sides when the guard plate 16 covers the opening 14. In some embodiments, to ensure relative reliability of the seal, the overlap on the second side is less than or equal to the overlap on the first side.

[0081] Next, consider the shape of the inlet, as shown in Figure 2. The inlet in the figure is an isosceles triangle with a rounded apex. This rounded apex is used to construct the through-hole 20 shown in Figure 2, through which the lifting rod 10 enters the shot blasting chamber. Therefore, the diameter of the through-hole 20 is required to be larger than the diameter of the lifting rod 10.

[0082] Accordingly, since the diameter of the through hole 20 is larger than the diameter of the lifting rod 10, when the lifting rod 10 passes through the through hole 20, there will inevitably be a gap between the through hole 20 and the lifting rod 10. This gap should be less than or equal to the diameter of the projectile.

[0083] Since the through hole 20 is located approximately in the middle of the opening 14, the inlet hole will have a certain width dimension, which will partially connect the inside and outside of the shot blasting chamber when the guard plate 16 is in the stopped state. Although the boom assembly has, for example, a self-rotating sprocket 11 that can block some of the shot, in a more preferred embodiment the self-rotating sprocket 11 is also protected. Under this requirement, left and right rubber plates are provided on both sides of the waist of the inlet, as shown by the rubber sealing plate 21 in FIG2.

[0084] The corresponding left and right rubber plates are mated together, and an inlet 24 is formed at the extrusion port of the rod 10. An arc-shaped opening is formed at the mating end to assemble with the round head to form an intervention port. This intervention port is the through hole 20 shown in Figure 2. This through hole is equivalent to being composed of three parts.

[0085] Accordingly, the access port forms a shaft hole fit with the boom 10.

[0086] Regarding the shot blasting chamber, in the structure illustrated in Figure 2, the portion of the hanger 10 of the shot blasting chamber located outside the shot blasting chamber has a cover plate, such as the sealing cover 12 shown in Figure 1. The sealing cover 12 is located above the inlet and covers the inlet from above. The two are sealed by a non-contact seal. The shot that flies out is blocked by the sealing cover 12 and falls back into the shot blasting chamber when the guard plate 14 is reset.

[0087] Because a non-contact sealing method is used, a reserved distance is left between the cover plate and the protective plate 16. Correspondingly, a bristle bar 13 is provided below the cover plate to fill the reserved distance. Although the bristle bar 13 and the protective plate 16 are in contact seal, friction will occur between them during the rotation of the boom 10. However, the friction generated by the bristle bar 13 is relatively small, and it can avoid direct rigid impact between the projectile and the protective plate 16, thus reducing noise. In a more preferred embodiment, it is a necessary configuration.

Claims

1. A top sealing device for a shot blasting chamber, disposed at a pre-set opening at the top of the shot blasting chamber, characterized in that, include: A protective plate, located in the shot blasting chamber, is a strip extending along the edge of a long plate. The guard plate has an inlet at a predetermined position on the first long plate side, which opens toward the side where the first long plate side is located, for cooperating with the hanger rod; A driving device is located on the second side of the opening, which is opposite to the first side of the opening where the first long plate is located when the guard plate is in the state of covering the opening; and the driving device is located outside the shot blasting chamber, with the end of the provided driving arm hinged to the back side of the guard plate, which is the plate surface facing outward when the guard plate is in the state of covering the opening; and the hinge position of the guard plate and the driving arm is offset towards the second long plate, and is offset from the inlet in the direction of the long plate by a clearance distance, which is used to avoid the part of the lifting rod assembly located outside the shot blasting chamber; wherein, the driving arm is a rocker arm hinged to a predetermined position on the second side of the opening; the driving arm is an arc-shaped arm; the side where the center of the arc-shaped arm is located is the side where the top of the shot blasting chamber is located.

2. The top sealing device of the shot blasting chamber according to claim 1, characterized in that, The drive arm is hinged in the shot blasting chamber using a main hinge support at a predetermined height. The height of the main hinge support is 0.8 to 1.3 times the inner arc height of the drive arm. The distance between the main hinge support and the second side edge of the opening is 0.55 to 0.75 times the inner arc chord length of the drive arm.

3. The top sealing device of the shot blasting chamber according to claim 1 or 2, characterized in that, A guide arm is provided on each side of the drive arm; the guide arm is parallel to the drive arm and has the same swing radius; correspondingly, the end of the guide arm is hinged to the back side of the guard plate, and the hinge point of the guide arm on the back side of the guard plate and the hinge point of the drive arm on the back side are located on a first line, which is parallel to the edge of the first long plate; the beginning of the guide arm is hinged to the shot blasting chamber, and the hinge point of the guide arm and the shot blasting chamber and the hinge point of the drive arm outside the shot blasting chamber are located on a second line, which is parallel to the edge of the first long plate.

4. The top sealing device of the shot blasting chamber according to claim 1, characterized in that, The drive device further includes drive components selected from the following: a swing cylinder, the drive arm being connected to the swing arm of the swing cylinder; a swing motor, the drive arm being connected to the swing arm of the swing motor; a crank-rocker mechanism, the drive arm constituting the rocker arm of the crank-rocker mechanism; a double-crank mechanism, the drive arm constituting a crank-triangle mechanism of the double-crank mechanism, the driven rocker arm of the triangle mechanism being integrated with the drive arm and forming a lever with two parts bounded by a lever hinge support, the lever hinge support being the hinge support of the drive arm hinged outside the shot blasting chamber; or a gear and rack mechanism, the gear shaft of the gear and rack mechanism constituting the hinge shaft of the drive arm hinged outside the shot blasting chamber; the corresponding rack is driven by a linear power component.

5. The top sealing device of the shot blasting chamber according to claim 1, characterized in that, The width of the protective plate is greater than the width of the opening, and the two sides overlap when the protective plate covers the opening.

6. The top sealing device of the shot blasting chamber according to claim 5, characterized in that, The overlap on the second side is less than or equal to the overlap on the first side.

7. The top sealing device of the shot blasting chamber according to claim 1, characterized in that, The inlet is an isosceles triangle with a rounded apex. The diameter of the rounded apex is larger than the diameter of the boom, while a gap is left between the rounded apex and the boom, which is less than or equal to the diameter of the projectile.

8. The top sealing device of the shot blasting chamber according to claim 7, characterized in that, Left and right rubber plates are provided on both sides of the waist of the inlet; the corresponding left and right rubber plates are mated together and an inlet is formed at the inlet of the rod. An arc-shaped opening is formed at the mating end to assemble with the round head to form an intervention port. The intervention port and the rod form a shaft hole fit together.

9. A shot blasting chamber, characterized in that, Includes the top sealing device of the shot blasting chamber as described in any one of claims 1 to 8, wherein the portion of the hanger rod of the shot blasting chamber located outside the shot blasting chamber has a cover plate to cover the inlet from above; A reserved distance is left between the cover plate and the protective plate, and a corresponding bristle is provided below the cover plate to fill the reserved distance.

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