Mold wear-resisting plate surface pretreatment system

Abstract

A mold wear-resisting plate surface pretreatment system comprises a leveler (110) and a sand blasting machine (120), the sand blasting machine (120) is located on one side of the discharging end of the leveler (110), a rotary sand blasting table (62) is movably installed on the top of a screening hopper (61), and a driving motor (68) for driving the rotary sand blasting table (62) to rotate is arranged on one side of the screening hopper (61). The leveling machine has the advantages that the lower leveling roller and the upper leveling roller of the leveling machine are divided into two independent individuals through the lower roller press base and the upper roller press base respectively, the lower leveling roller and the upper leveling roller are in transmission through the fixed transmission gear and the movable transmission gear, and the distance is convenient and fast to adjust; (2) chippings and powder generated in the sand blasting process are screened through a sieve plate, so that grinding materials in each time of sand blasting are clean, and the machining efficiency and quality of workpieces are improved; the sand blasting table and the driving part are separately arranged, and the driving part is externally arranged on the outer side of the sand blasting cavity, so that the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of metal plate processing, in particular to a surface pretreatment system for a mold wear-resistant plate. Background Art

[0002] Mold wear-resistant plate is an important material used in molds to reduce mechanical wear. It is widely used in the fields of plastics, rubber, metal and glass. It is made of steel plate as the base material and sintered with cemented carbide powder on its friction surface. Before calcination, the substrate needs to undergo surface pretreatment processes such as leveling and sandblasting. The existing processing process has the following problems: ① The positions of the upper and lower sets of rollers of the leveling machine are fixed, and the transmission structure of the upper and lower sets of rollers is complex. When leveling plates of different thicknesses, the spacing between the upper and lower rollers needs to be adjusted. The entire adjustment process is very cumbersome, time-consuming and labor-intensive; ② During the sandblasting and grinding process, the slag, abrasive and powder dropped from the workpiece are mixed together, affecting the efficiency of workpiece processing. At the same time, the existing turntable sandblasting machine has the drive part of the sandblasting table located below it, working together in the sandblasting box, which greatly affects its service life. Utility Model Content

[0003] The purpose of this utility model is to provide a surface pretreatment system for a mold wear-resistant plate in view of the above-mentioned deficiencies.

[0004] The utility model includes a leveling machine and a sandblasting machine. The sandblasting machine is located at one side of the discharging end of the leveling machine. The leveling machine includes a frame, a lower roller press base and an upper roller press base. The lower roller press base is fixed to the frame. The upper roller press base is movably installed on the frame through a lifting screw and is located directly above the lower roller press base. A group of lower leveling rollers is provided on the lower roller press base. A group of upper leveling rollers staggered front and back with the lower leveling rollers is provided on the upper roller press base. The lower roller press base is respectively provided with a height limiting mechanism for limiting the distance between the lower leveling rollers and the upper leveling rollers, and a driving mechanism for driving the lower leveling rollers and the upper leveling rollers to rotate. A loading roller table is provided at the front end of the lower roller press base, and a discharging platform is provided at the rear end of the lower roller press base.

[0005] The sandblasting machine includes a sandblasting box, a screening hopper and a rotary sandblasting table. The sandblasting box is installed on the top of the screening hopper and is connected to the screening hopper to form a sandblasting cavity. A sandblasting gun is provided in the sandblasting box, and an inclined screen plate is provided in the screening hopper. A sand outlet connected to the sandblasting gun is provided on one side of the screening hopper at the lower end of the screen plate, and a slag collecting box is provided at the bottom of the screening hopper; the rotary sandblasting table is movably installed on the top of the screening hopper, and a driving motor for driving the rotary sandblasting table is provided on one side of the screening hopper.

[0006] The four corners of the upper roller press base are provided with guide rods, and the four corners of the lower roller press base are provided with guide sleeves matching the guide rods; the height limiting mechanism is composed of two pairs of worm gear elevators, each pair of worm gear elevators are synchronously lifted and lowered by a transmission rod, and the two pairs of worm gear elevators are symmetrically installed on the left and right sides of the lower roller press base respectively; the four corners of the lower roller press base and the upper roller press base are symmetrically provided with fixed ear plates, and the upper and lower fixed ear plates are fixed by bolts.

[0007] The driving mechanism includes a leveling motor, a fixed transmission gear and a movable transmission gear. A group of lower leveling rollers and a group of upper leveling rollers are driven by chains; the fixed transmission gear is installed on one side of the upper roller press base and is transmitted to the gears between the upper leveling rollers. The movable transmission gear is movably installed on one side of the lower roller press base through a swing arm and is transmitted to the gears of the lower leveling rollers. A swing arm drive assembly is provided on the lower roller press base, and the swing arm drive assembly controls the movement of the movable transmission gear to engage with the fixed transmission gear for transmission. The leveling motor is installed on one side of the lower roller press base and drives the lower leveling roller to rotate.

[0008] A pair of transverse limit rollers are provided at the discharge end of the feeding roller, a transverse chute is provided on the feeding roller, a pair of sliders are provided in the transverse chute, and a locking screw is screwed on the slider, and the pair of transverse limit rollers are respectively installed on the corresponding sliders.

[0009] A pick-and-place door is provided on one side of the sandblasting box, and a group of cleaning nozzles facing the rotary sandblasting table are provided on the rear side of the sandblasting box at the end of the pick-and-place door.

[0010] A sand collecting trough with high ends and low middle is provided on the sand outlet of the screening hopper, and a sand outlet pipe connected to the sandblasting gun is provided in the middle of the sand collecting trough.

[0011] A pair of tracks is provided on the top of the screening hopper, and a track pulley running on the pair of tracks is provided at the bottom of the rotary sandblasting table. The rotary sandblasting table can be rotatably mounted on the track pulley through a rotating disk; a gear ring is coaxially provided at the bottom of the rotary sandblasting table, and a driving gear matching the gear ring is provided on the output shaft of the driving motor; positioning holes are respectively provided on the pair of tracks, and positioning pins matching the positioning holes are provided on the track pulley; the top of the rotary sandblasting table is a conical or spherical structure, and a group of workpiece support columns are arranged in a ring array on the top of the rotary sandblasting table, and a workpiece support seat is screwed on the workpiece support column.

[0012] The advantages of this utility model are: ① The lower and upper leveling rollers of the leveling machine are separated into two independent units by a lower roller press base and an upper roller press base, respectively. The lower and upper leveling rollers are driven by a fixed transmission gear and a movable transmission gear, making the spacing between them easy and quick to adjust. ② The debris and powder generated during the sandblasting process are screened by a sieve plate, ensuring that the abrasive is clean during each blasting, improving the processing efficiency and quality of the workpiece. The sandblasting table is separated from the drive components, which are located outside the sandblasting chamber, extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the leveling machine structure.

[0015] Figure 3 It is a schematic diagram of the internal structure of the leveling machine.

[0016] Figure 4 It is a schematic diagram of the driving mechanism structure.

[0017] Figure 5 It is a structural diagram of the height limiting mechanism.

[0018] Figure 6 It is a schematic diagram of the sandblasting machine structure.

[0019] Figure 7 It is a schematic diagram of the internal structure of the sandblasting machine.

[0020] Figure 8 It is a schematic diagram of the structure of the sandblasting machine from the second perspective.

[0021] Figure 9 It is a schematic diagram of the screening hopper structure.

[0022] Figure 10 It is a schematic diagram of the structure of a rotary sandblasting table. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. This is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, if the terms "first", "second", etc. appear in the description of the present invention, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] As shown in the accompanying drawings, the present invention includes a leveling machine 110 and a sandblasting machine 120 . The sandblasting machine 120 is located at one side of the discharge end of the leveling machine 110 .

[0028] The structure and working method of the leveling machine 110 include a frame 25, a lower roller press base 26, and an upper roller press base 27. The lower roller press base 26 is fixed to the frame 25. The upper roller press base 27 is movably mounted on the frame 25 via a lifting screw 28 and is located directly above the lower roller press base 26. The lower roller press base 26 is equipped with a set of lower leveling rollers 30. The upper roller press base 27 is equipped with a set of upper leveling rollers 31 that are staggered in front and behind the lower leveling rollers 30.

[0029] The lower roller press base 26 is provided with a height limiting mechanism 35 for limiting the distance between the lower leveling roller 30 and the upper leveling roller 31, and a driving mechanism 36 for driving the lower leveling roller 30 and the upper leveling roller 31 to rotate. The front end of the lower roller press base 26 is provided with a loading roller 37, and the rear end of the lower roller press base 26 is provided with a discharging platform 38.

[0030] The lower roller press base 26 and the upper roller press base 27 are distributed up and down, and are both relatively independent entities, which facilitates the adjustment of the overall distance between the lower leveling roller 30 and the upper leveling roller 31.

[0031] The lifting screw 28 is used to control the up and down movement of the upper roller press base 27, and the height limiting mechanism 35 is used to limit the distance between the lower roller press base 26 and the upper roller press base 27. Before adjustment, the upper roller press base 27 is lifted up by the lifting screw 28, and then the height limiting mechanism 35 is adjusted. After the adjustment is completed, the upper roller press base 27 is lowered and pressed tightly. At this time, the distance between the lower roller press base 26 and the upper roller press base 27 can be fixed.

[0032] Furthermore, the four corners of the upper roller press base 27 are each provided with a guide rod 40 , and the four corners of the lower roller press base 26 are each provided with a guide sleeve 41 that matches the guide rod 40 .

[0033] Through the cooperation of the guide rod 40 and the guide sleeve 41, the upper roller press base 27 can maintain vertical lifting and stability on the horizontal plane when moving up and down, and the lower leveling roller 30 and the upper leveling roller 31 always remain parallel.

[0034] Preferably, the height limiting mechanism 35 is composed of two pairs of worm gear elevators 42 , each pair of worm gear elevators 42 is synchronously lifted and lowered by a transmission rod, and the two pairs of worm gear elevators 42 are symmetrically installed on the left and right sides of the lower roller press base 26 .

[0035] Worm gear elevator mounting grooves are provided on the left and right sides of the lower roller press base 26. Each pair of worm gear elevators 42 are synchronously lifted and lowered by a transmission rod. A crank that drives the transmission rod to rotate is provided on the lower roller press base 26. The transmission rod and the crank are driven by gears. By turning the crank, the transmission rod is driven to rotate to achieve synchronous lifting of a pair of worm gear elevators.

[0036] Furthermore, fixing lugs 43 are symmetrically provided at the four corners of the lower roller press base 26 and the upper roller press base 27, and the upper and lower fixing lugs 43 are fixed by bolts.

[0037] After the spacing between the lower roller press base 26 and the upper roller press base 27 is adjusted, the four corners are fixed with bolts to further improve the stability of the lower leveling roller 30 and the upper leveling roller 31 during the rolling process.

[0038] Preferably, the driving mechanism 36 includes a leveling motor 45, a fixed transmission gear 46 and a movable transmission gear 47, and a group of lower leveling rollers 30 and a group of upper leveling rollers 31 are all driven by chains; the fixed transmission gear 46 is installed on one side of the upper roller press base 27, and is gear-transmitted to the upper leveling roller 31, and the movable transmission gear 47 is movably installed on one side of the lower roller press base 26 through a swing arm 50, and is gear-transmitted to the lower leveling roller 30, and a swing arm drive assembly 51 is provided on the lower roller press base 26, and the swing arm drive assembly 51 controls the movement of the movable transmission gear 47 to engage with the fixed transmission gear 46 for transmission, and the leveling motor 45 is installed on one side of the lower roller press base 26, and drives the lower leveling roller 30 to rotate.

[0039] Both ends of the lower leveling roller 30 and both ends of the upper leveling roller 31 are provided with sprockets, and the lower leveling rollers 30 and the upper leveling rollers 31 are connected by chains.

[0040] In this case, gears are installed at the ends of one of the lower leveling rollers 30 and one of the upper leveling rollers 31. A fixed transmission gear 46 is mounted on the upper roller press base 27 and can move up and down with the upper roller press base 27, constantly meshing with the gear on the upper leveling roller 31. One end of a swing arm 50 is coaxially mounted on the geared end of one of the lower leveling rollers 30, meaning that the movable transmission gear 47 constantly meshes with the gear on the lower leveling roller 30. When adjusting the spacing, the swing arm drive assembly 51 controls the height of the movable transmission gear 47 to facilitate meshing with the fixed transmission gear 46. The swing arm drive assembly 51 in this case is a worm gear lifting assembly, with the lifting rod hinged to the bottom of the swing arm 50 and the base hinged to the lower roller press base 26.

[0041] Furthermore, a pair of transverse limit rollers 53 are provided at the discharge end of the loading roller 37, a transverse chute is provided on the loading roller 37, a pair of sliders are provided in the transverse chute, and a locking screw is screwed on the slider, and the pair of transverse limit rollers 53 are respectively installed on the corresponding sliders.

[0042] The distance between the two transverse limit rollers 53 can be adjusted according to the width of the plate. When in use, the steel plate is fed in from between the two transverse limit rollers 53. After the front end of the steel plate enters the lower leveling roller 30 and the upper leveling roller 31, the two transverse limit rollers 53 can effectively prevent the steel plate from sliding sideways and can keep moving in a straight line.

[0043] The structure and working method of the sandblasting machine 120 include a sandblasting box 60, a screening hopper 61, and a rotary sandblasting table 62. The sandblasting box 60 is installed on top of the screening hopper 61 and is connected to the screening hopper 61 to form a sandblasting cavity. A sandblasting gun 63 is provided in the sandblasting box 60, and an inclined screen plate 65 is provided in the screening hopper 61. A sand outlet connected to the sandblasting gun 63 is provided on one side of the screening hopper 61 at the lower end of the screen plate 65. A slag collecting box 66 is provided at the bottom of the screening hopper 61.

[0044] The rotary sandblasting platform 62 is movably mounted on the top of the screening hopper 61 . A driving motor 68 for driving the rotary sandblasting platform 62 to rotate is provided on one side of the screening hopper 61 .

[0045] The sandblasting box 60 is provided with a transparent observation window and a pair of hand holes. Rubber gloves are provided in the hand holes to facilitate the staff to put their hands into the sandblasting box 60 to operate the sandblasting gun 63. A pressure tank and a medium power system are provided on one side of the sandblasting box 60 to pressurize the abrasive and spray it out through the sandblasting gun 63. The working principle is the same as that of the existing press-in dry sandblasting machine.

[0046] In this case, a sieve plate 65 is provided in the screening hopper 61. After the abrasive grinds the workpiece and falls, it is screened through the sieve plate 65 together with the working slag. The complete abrasive is located above the sieve plate 65, while the smaller slag and powder pass through the sieve plate 65 and fall into the slag collecting box 66 below, completing the sorting and ensuring the grinding effect of the abrasive.

[0047] Secondly, the driving motor 68 of this case is located outside and separated from the rotating sandblasting table 62. When driving the rotating sandblasting table 62 to rotate, it will not be affected by the abrasive in the sandblasting chamber, thereby extending its service life.

[0048] When taking or placing workpieces, the rotary sandblasting table 62 can be moved out of the sandblasting box 60 , which is convenient and quick.

[0049] Furthermore, a pick-up door is provided on one side of the sandblasting box 60 , and a group of cleaning nozzles 70 facing the rotating sandblasting table 62 are provided on the rear side of the sandblasting box 60 at the end of the pick-up door.

[0050] The access door seals the sandblasting chamber 60 and allows for workpiece access. A cleaning nozzle 70, connected to a pressure tank, uses high-pressure gas within the tank to purge abrasive from the rotating sandblasting table 62 and the workpiece surface, preventing it from being carried out and contaminating the environment. During installation, the cleaning nozzle 70 is tilted downward, toward the central axis of the rotating sandblasting table 62. Before the rotating sandblasting table 62 is removed, the cleaning nozzle 70 is activated, and the rotating sandblasting table 62 remains in rotation. The cleaning nozzle 70 then sequentially removes abrasive from the rotating sandblasting table 62 and the workpiece surface.

[0051] Furthermore, a sand collecting trough 72 with high ends and low middle is provided on the sand outlet of the screening hopper 61 , and a sand outlet pipe communicating with the sandblasting gun 63 is provided in the middle of the sand collecting trough 72 .

[0052] The sand collecting trough 72 is convenient for collecting the abrasive flowing out of the sand outlet into the sand outlet pipe.

[0053] Preferably, a pair of rails 73 are provided on the top of the screening hopper 61, and a rail pulley 74 that travels on the pair of rails 73 is provided at the bottom of the rotary sandblasting platform 62. The rotary sandblasting platform 62 can be rotatably mounted on the rail pulley 74 through a rotating disk; a gear ring 75 is coaxially provided at the bottom of the rotary sandblasting platform 62, and a driving gear that cooperates with the gear ring 75 is provided on the output shaft of the drive motor 68.

[0054] The rotary sandblasting table 62 is moved in or out by a rail pulley 74. The diameter of the ring gear 75 is smaller than the diameter of the rotary sandblasting table 62. After installation, it is hidden at the bottom of the rotary sandblasting table 62. During sandblasting, the abrasive will not be sprayed onto the ring gear 75. A part of the driving gear extends into the screening hopper 61 and engages with the ring gear 75. During specific installation, a shielding plate 80 is provided on the screening hopper 61 above the driving gear to shield the driving gear and prevent the abrasive from contacting the driving gear.

[0055] Furthermore, a pair of rails 73 are respectively provided with positioning holes, and the rail pulley 74 is provided with positioning pins 77 that match the positioning holes.

[0056] The rotary sandblasting table 62 is fixed in position within the sandblasting chamber by means of a positioning pin 77 engaging with a positioning hole, thereby facilitating quick engagement of the drive gear and the ring gear 75. A limit plate may be provided on the rail 73 at the end opposite the access door to define the maximum entry position of the rail trolley 74, which is then secured in place by means of a positioning pin 77.

[0057] Preferably, the top of the rotary sandblasting table 62 is a conical or spherical structure, which can effectively prevent the abrasive from accumulating on its surface. The top of the rotary sandblasting table 62 has a group of workpiece support columns 78 in a circular array, and a workpiece support seat 79 is screwed on the workpiece support column 78. The workpiece support seat 79 is used to place the workpiece.

[0058] The workpiece support seat 79 is threadedly connected to the workpiece support column 78, so the support seat can be quickly replaced according to the size of the workpiece, and the direction of the workpiece support seat 79 can also be adjusted. For example, for a long workpiece, the corresponding long workpiece support seat 79 can be replaced, and then the direction of the workpiece in the sandblasting chamber can be determined by adjusting the direction.

Claims

1. A mold wear-resistant plate surface pretreatment system, characterized in that It includes a leveling machine (110) and a sandblasting machine (120), wherein the sandblasting machine (120) is located at one side of the discharge end of the leveling machine (110). The leveling machine (110) includes a frame (25), a lower roller press base (26) and an upper roller press base (27), wherein the lower roller press base (26) is fixed to the frame (25), and the upper roller press base (27) is movably mounted on the frame (25) through a lifting screw (28) and is located directly above the lower roller press base (26). A group of lower leveling rollers (30) are provided on the lower roller press base (26), and a group of lower leveling rollers (30) are provided on the upper roller press base (27). (30) upper leveling rollers (31) staggered front and back; the lower roller press base (26) is provided with a height limiting mechanism (35) for limiting the distance between the lower leveling roller (30) and the upper leveling roller (31), and a driving mechanism (36) for driving the lower leveling roller (30) and the upper leveling roller (31) to rotate, a loading roller (37) is provided at the front end of the lower roller press base (26), and a discharging platform (38) is provided at the rear end of the lower roller press base (26); The sandblasting machine (120) includes a sandblasting box (60), a screening hopper (61) and a rotary sandblasting table (62), wherein the sandblasting box (60) is mounted on the top of the screening hopper (61) and is connected to the screening hopper (61) to form a sandblasting cavity, a sandblasting gun (63) is provided in the sandblasting box (60), an inclined screen plate (65) is provided in the screening hopper (61), a sand outlet communicating with the sandblasting gun (63) is provided on one side of the screening hopper (61) at the lower end of the screen plate (65), and a slag collecting box (66) is provided at the bottom of the screening hopper (61); the rotary sandblasting table (62) is movably mounted on the top of the screening hopper (61), and a driving motor (68) for driving the rotary sandblasting table (62) to rotate is provided on one side of the screening hopper (61).

2. A mold wear plate surface pretreatment system according to claim 1, characterized in that The four corners of the upper roller press base (27) are provided with guide rods (40), and the four corners of the lower roller press base (26) are provided with guide sleeves (41) matched with the guide rods (40); the height limiting mechanism (35) is composed of two pairs of worm gear elevators (42), each pair of worm gear elevators (42) is synchronously lifted and lowered by a transmission rod, and the two pairs of worm gear elevators (42) are symmetrically installed on the left and right sides of the lower roller press base (26); the four corners of the lower roller press base (26) and the upper roller press base (27) are symmetrically provided with fixed ear plates (43), and the upper and lower fixed ear plates (43) are fixed by bolts.

3. A mold wear plate surface pretreatment system according to claim 1, characterized in that The driving mechanism (36) includes a leveling motor (45), a fixed transmission gear (46) and a movable transmission gear (47). A group of lower leveling rollers (30) and a group of upper leveling rollers (31) are both driven by chains. The fixed transmission gear (46) is installed on one side of the upper roller press base (27) and is gear-driven with the upper leveling roller (31). The movable transmission gear (47) is movably installed on one side of the lower roller press base (26) through a swing arm (50) and is gear-driven with the lower leveling roller (30). A swing arm driving assembly (51) is provided on the lower roller press base (26). The swing arm driving assembly (51) controls the movable transmission gear (47) to move and engage with the fixed transmission gear (46). The leveling motor (45) is installed on one side of the lower roller press base (26) and drives the lower leveling roller (30) to rotate.

4. A mold wear plate surface pretreatment system according to claim 1, characterized in that A pair of transverse limiting rollers (53) are provided at the discharge end of the feeding roller (37), a transverse chute is provided on the feeding roller (37), a pair of sliders are provided in the transverse chute, and a locking screw is screwed on the slider, and the pair of transverse limiting rollers (53) are respectively installed on the corresponding sliders.

5. A mold wear plate surface pretreatment system according to claim 1, characterized in that A pick-up door is provided on one side of the sandblasting box (60), and a group of cleaning nozzles (70) facing the rotating sandblasting table (62) are provided on the rear side of the sandblasting box (60) at the end of the pick-up door.

6. A mold wear plate surface pretreatment system according to claim 1, characterized in that A sand collecting trough (72) with high ends and low middle is provided on the sand outlet of the screening hopper (61), and a sand outlet pipe communicating with the sandblasting gun (63) is provided in the middle of the sand collecting trough (72).

7. A mold wear plate surface pretreatment system according to claim 1, characterized in that A pair of rails (73) is provided on the top of the screening hopper (61), a rail pulley (74) that travels on the pair of rails (73) is provided on the bottom of the rotary sandblasting table (62), and the rotary sandblasting table (62) is rotatably mounted on the rail pulley (74) through a rotating disk; a gear ring (75) is coaxially provided on the bottom of the rotary sandblasting table (62), and a driving gear that matches the gear ring (75) is provided on the output shaft of the driving motor (68); positioning holes are respectively provided on the pair of rails (73), and a positioning pin (77) that matches the positioning hole is provided on the rail pulley (74); the top of the rotary sandblasting table (62) is a conical or spherical structure, and a group of workpiece support columns (78) are provided in an annular array on the top of the rotary sandblasting table (62), and a workpiece support seat (79) is screwed on the workpiece support column (78).

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