A combined screw production apparatus

Abstract

The application discloses a combined screw production equipment, which comprises a feeding mechanism, an upper layer limiting disc, a middle layer limiting disc, a lower layer limiting disc, a pressing mechanism and a sorting mechanism. The feeding mechanism comprises a vibrating screen and a feeding chute. The pressing mechanism is arranged on the side of the upper layer limiting disc and comprises a pre-pressing block. The bottom surface of the pre-pressing block is gradually inclined downward along the rotating direction of the upper layer limiting disc. The sorting mechanism is arranged on the discharging side of the lower layer limiting disc and comprises a lower screening ring arranged outside the lower layer limiting disc and an upper screening ring arranged outside the middle layer limiting disc. The lower screening ring is kept at a predetermined gap from the lower layer limiting disc. The lower screening ring is provided with a blowing mechanism for blowing air to the lower layer limiting disc. The upper screening ring is kept at a predetermined gap from the middle layer limiting disc. By using the application, the feeding and combination of metal nails and plastic pipes can be automatically realized, and the unqualified combined screws can be automatically removed after combination.

Description

Technical Field

[0001] This invention relates to the field of combination screw production, and more particularly to a combination screw production equipment. Background Technology

[0002] Combination screws are screws with additional structures besides the conventional screw body. Depending on their function, their combination with the screw body varies, generally consisting of various shaped plastic components fitted onto the bottom of the screw body. For example, connecting a plastic tube to the bottom of the screw body creates an expansion screw. Expansion screws are frequently used in industrial assembly for component installation. An expansion screw mainly consists of a plastic tube and a metal nail. During installation, the metal nail extends into the plastic tube, expanding it to connect and fix different components. In expansion screw production equipment, a feeding mechanism is often used to independently feed the metal nails and plastic tubes. This feeding mechanism includes a vibrating screen and a feeding slide rail. However, because the plastic tube is lightweight, it is prone to tilting or jamming during transport in the feeding slide rail, affecting feeding stability. Furthermore, screw assembly speeds are high, often reaching hundreds per minute. Failed assembly or isolated screw bodies or plastic tubes are difficult to quickly remove from the finished product, requiring manual sorting later, which is time-consuming and labor-intensive. If visual inspection is used, additional cameras and rejection structures are required, which are expensive and complex to maintain. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a combined screw production equipment that can automatically feed and combine metal screws and plastic tubes separately, and automatically reject unqualified combined screws after assembly.

[0004] To address the aforementioned technical problems, this invention provides a combined screw production device, comprising a feeding mechanism, an upper limiting plate, a middle limiting plate, a lower limiting plate, a pressing mechanism, and a sorting mechanism.

[0005] The feeding mechanism includes a vibrating screen and a feeding chute. One end of the feeding chute is connected to the vibrating screen, and the other end is directly opposite the side wall of the corresponding upper or lower limiting plate.

[0006] The upper limiting plate, middle limiting plate, and lower limiting plate are arranged sequentially on the rotating shaft from top to bottom; the edges of the upper limiting plate, middle limiting plate, and lower limiting plate are all provided with limiting teeth;

[0007] The pressing mechanism is located on the side of the upper limiting plate and includes a pre-pressing block. The bottom surface of the pre-pressing block gradually slopes downward along the rotation direction of the upper limiting plate.

[0008] The sorting mechanism is located on the discharge side of the lower limiting plate and is used to remove incompletely assembled screws. It includes a lower screening ring located outside the lower limiting plate and an upper screening ring located outside the middle limiting plate. The lower screening ring maintains a predetermined gap with the lower limiting plate. The lower screening ring is equipped with an air blowing mechanism for blowing air onto the lower limiting plate. The upper screening ring maintains a predetermined gap with the middle limiting plate.

[0009] As an improvement to the above solution, the lower screening ring has a recess on the side facing the lower limiting plate, and the air blowing mechanism is provided on the recess.

[0010] As an improvement to the above solution, the lower screening ring includes an annular groove and an annular top cover. The annular top cover is located at the top of the annular groove, and the recess is composed of a first inclined side, a clearance surface, and a second inclined side located on the side wall of the annular groove, connected in sequence.

[0011] As an improvement to the above solution, the air blowing mechanism includes an air supply pipe, an air outlet, and an air source. The air outlet is located on the clearance surface and includes an upwardly sloping air outlet, a middle air outlet, and a downwardly sloping air outlet. The upwardly sloping air outlet, the middle air outlet, and the downwardly sloping air outlet are arranged sequentially at different heights on the same vertical line. The upwardly sloping air outlet can blow air upwards at an angle, the middle air outlet can blow air horizontally, and the downwardly sloping air outlet can blow air downwards at an angle.

[0012] As an improvement to the above solution, the pressing mechanism further includes an arc-shaped push block located in front of the pre-pressing block and a pressing block located behind the pre-pressing block. The angle between the bottom surface of the pressing block and the horizontal plane is greater than the angle between the bottom surface of the pre-pressing block and the horizontal plane. The arc-shaped push block has a pushing top surface that extends outward relative to the upper limiting plate.

[0013] As an improvement to the above solution, the feeding mechanism also includes a limiting mechanism.

[0014] The limiting mechanism is provided on the feeding chute;

[0015] The limiting mechanism includes a connecting seat, a sliding rod, a reset torsion spring, a connecting arm, and a limiting rod, wherein the connecting seat is disposed on the feeding chute;

[0016] The slide bar is fixedly mounted on the connecting seat;

[0017] One end of the connecting arm is connected to the limiting rod, and the other end is provided with a connecting hole;

[0018] The connecting arm is sleeved on the slide rod through the connecting hole and can rotate relative to the slide rod;

[0019] The reset torsion spring is mounted on the slide rod and connects the limiting rod and the connecting seat;

[0020] Under normal operating conditions, the limiting rod is located directly above the feeding chute.

[0021] As an improvement to the above solution, the connecting seat extends upward from the side of the feeding chute, and both ends of the sliding rod pass through the connecting seat; the lower surface of the feed end of the limiting rod is provided with a first guiding slope; the end of the feeding chute is provided with a horizontal conveying section, and the discharge end of the limiting rod is provided with a horizontal limiting section corresponding to the horizontal conveying section.

[0022] As an improvement to the above solution, the feeding chute is composed of two parallel chute plates, and the outer side of the chute plate is provided with a reinforcing plate that is perpendicular to the chute plate and extends along the upper edge of the chute plate.

[0023] Accordingly, the present invention also provides a method for producing combination screws, including the combination screw production equipment as described above, comprising the following steps:

[0024] (1) The plastic tube is fed into the limiting teeth of the lower limiting plate by the first feeding mechanism that docks with the lower limiting plate;

[0025] (2) The metal nail is fed into the limiting teeth of the upper limiting plate by the second feeding mechanism located behind the first feeding mechanism and connected to the upper limiting plate;

[0026] (3) As the upper limiting plate, the middle limiting plate and the lower limiting plate rotate synchronously, the metal nail box and plastic tube are driven through the pressing mechanism to press the metal nail into the plastic tube directly below it.

[0027] (4) The upper limit plate, the middle limit plate and the lower limit plate continue to rotate synchronously. The pressed combined screws pass through the air blowing mechanism, and the unqualified combined screws are blown away from the middle limit plate and the lower limit plate by the air blowing mechanism.

[0028] (5) The upper limit plate, the middle limit plate and the lower limit plate continue to rotate synchronously to deliver the qualified combination screws to the discharge station for discharge.

[0029] As an improvement to the above scheme, step (4) where the defective combined screw is blown away from the middle and lower limiting plates by the air blowing mechanism means: if only the metal nail passes through the air blowing mechanism, the upward-sloping air outlet blows air upwards at the lower part of the metal nail, causing the nail head to disengage from the limiting teeth of the middle limiting plate, and the metal nail falls downwards; if only the plastic tube passes through the air blowing mechanism, the downward-sloping air outlet blows air downwards at the lower part of the plastic tube, causing the tube edge of the plastic tube to disengage from the limiting teeth of the lower limiting plate, and the plastic tube falls downwards; if the metal nail and plastic tube are combined and then pass through the air blowing mechanism, the air pressure at the middle air outlet will press the connection between the metal nail and the plastic tube tightly onto the lower limiting plate, and the air pressure at the upward-sloping air outlet on the metal nail and the air pressure at the downward-sloping air outlet on the plastic tube are symmetrical, firmly pressing the combined screw onto the middle and lower limiting plates.

[0030] Implementing this invention has the following beneficial effects:

[0031] Using the above structure, metal nails and plastic tubes can be automatically fed and combined separately. The sorting mechanism can automatically remove unqualified combined screws, ensuring a high yield rate at the outlet.

[0032] The air outlet is located on the clearance surface and includes an upper inclined air outlet, a middle air outlet, and a lower inclined air outlet. It can emit airflows in different directions to different parts of the combined screw at different positions. In conjunction with the middle limiting plate and upper screening ring used to guide the metal nail, and the lower limiting plate and lower screening ring used to guide the plastic tube, it can remove unqualified combined screws or their components.

[0033] The feeding chute is equipped with a limiting rod, which is swayably mounted on a sliding rod via a connecting arm. The top of the material in the feeding chute is pressed down by the limiting rod, ensuring that all materials are neatly arranged on the feeding chute. On one hand, the return torsion spring provides a constant clamping force to the limiting rod. When conveying materials of different sizes, the limiting rod can automatically adjust to different distances from the feeding chute, exhibiting self-adaptive capability. On the other hand, if material gets stuck in the feeding chute, the operator can easily flip the limiting rod open to remove the stuck material. When the operator releases the limiting rod, it will be driven by the return torsion spring to press down on the material on the feeding chute again, facilitating daily maintenance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a combined screw production equipment according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the feeding mechanism according to an embodiment of the present invention;

[0036] Figure 3This is a schematic diagram of the pressing mechanism according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of a sorting mechanism according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of an annular groove according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram showing the arrangement positions of the first and second feeding mechanisms according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram illustrating the screening principle of a sorting mechanism according to an embodiment of the present invention when passing through a single metal nail;

[0041] Figure 8 This is a schematic diagram illustrating the screening principle of a sorting mechanism according to an embodiment of the present invention when passing through a single plastic tube;

[0042] Figure 9 This is a schematic diagram of the screening principle of the sorting mechanism according to an embodiment of the present invention when the combined screws are assembled;

[0043] Figure 10 This is a schematic diagram of the screening principle of a sorting mechanism according to an embodiment of the present invention when passing through a combination screw that is not fully assembled. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0045] like Figure 1 As shown, the first embodiment of the present invention provides a combined screw production equipment, including a feeding mechanism 1, an upper limiting plate 2, a middle limiting plate 3, a lower limiting plate 4, a pressing mechanism 5, and a sorting mechanism 6.

[0046] The feeding mechanism 1 includes a vibrating screen 11 and a feeding chute 12. One end of the feeding chute 12 is connected to the vibrating screen 11, and the other end is directly opposite to the side wall of the corresponding upper limiting plate 2 or lower limiting plate 4.

[0047] The upper limiting plate 2, the middle limiting plate 3 and the lower limiting plate 4 are arranged sequentially from top to bottom on the rotating shaft 5; the edges of the upper limiting plate 2, the middle limiting plate 3 and the lower limiting plate 4 are all provided with limiting teeth 21;

[0048] The pressing mechanism 5 is located on the side of the upper limiting plate 2 and includes a pre-pressing block 51. The bottom surface 511 of the pre-pressing block 51 gradually tilts downward along the rotation direction of the upper limiting plate 2.

[0049] Combination Figure 4 As shown, the sorting mechanism 6 is located on the discharge side of the lower limiting plate 4 and is used to remove incompletely assembled combination screws. It includes a lower screening ring 61 located outside the lower limiting plate 4 and an upper screening ring 62 located outside the middle limiting plate 3. The lower screening ring 61 maintains a predetermined gap with the lower limiting plate 4. The lower screening ring 61 is provided with an air blowing mechanism 7 for blowing air onto the lower limiting plate 4. The upper screening ring 62 maintains a predetermined gap with the middle limiting plate 3.

[0050] Using the above structure, metal nails and plastic tubes can be automatically fed and combined separately. The sorting mechanism 6 can automatically remove unqualified combined screws, ensuring the yield rate of products reaching the outlet.

[0051] Preferably, combined with Figure 5 As shown, the lower screening ring 61 has a recessed portion 611 on the side facing the lower limiting plate 4, and the air blowing mechanism 7 is provided on the recessed portion 611. The lower screening ring 61 includes an annular groove 612 and an annular upper cover 613. The annular upper cover 613 is located on the top of the annular groove 612. The recessed portion 611 is composed of a first inclined side 614, a clearance surface 615 and a second inclined side 616 located on the side wall of the annular groove 612, connected in sequence.

[0052] like Figures 7-10 As shown, the air blowing mechanism 7 includes an air supply pipe 71, an air outlet, and an air source. The air outlet is located on the clearance surface 615 and includes an upwardly sloping air outlet 72, a middle air outlet 73, and a downwardly sloping air outlet 74. The upwardly sloping air outlet 72, the middle air outlet 73, and the downwardly sloping air outlet 74 are arranged sequentially at different heights on the same vertical line. The upwardly sloping air outlet 72 can blow air upwards at an angle, the middle air outlet 73 can blow air horizontally, and the downwardly sloping air outlet 74 can blow air downwards at an angle.

[0053] It should be noted that a recessed portion 611 is provided on the side of the lower screening ring 61 facing the lower limiting plate 4, and the air blowing mechanism 7 is provided on the recessed portion 611. This provides space for the assembled screw to fall into the recessed portion 611. The recessed portion 611 is composed of a first inclined side 614, a clearance surface 615, and a second inclined side 616 connected in sequence on the side wall of the annular groove 612, which can form a space with a gradually increasing opening. This facilitates the outward diffusion of the air blown out by the air blowing mechanism 7, avoids turbulence caused by the blown air, and prevents the assembled screw from falling into the recessed portion 611. The air outlet is located on the clearance surface 615 and includes an upper inclined air outlet 72, a middle air outlet 73 and a lower inclined air outlet 74. It can emit airflows in different directions to different parts of the combined screw at different positions. In conjunction with the middle limiting plate 3 and the upper screening ring 62 used to guide the metal nail, and the lower limiting plate 4 and the lower screening ring 61 used to guide the plastic tube, it can remove unqualified combined screws or their components.

[0054] like Figure 3 As shown, the pressing mechanism 5 further includes an arc-shaped push block 52 located in front of the pre-pressing block 51 and a pressing block 53 located behind the pre-pressing block 51. The angle between the bottom surface 531 of the pressing block 53 and the horizontal plane is greater than the angle between the bottom surface 511 of the pre-pressing block 51 and the horizontal plane. The arc-shaped push block 52 has a pushing surface that extends outward relative to the upper limiting plate 2. During the pressing process, the nail head 101 of the metal nail 100 located in the upper limiting plate 2 first contacts the arc-shaped push block 52. The arc-shaped push block 52 pushes the nail head 101 outward, causing the metal nail 100 to detach from the upper limiting plate 2 and fall into the plastic tube 200. Subsequently, the top of the metal nail 100 contacts the bottom surfaces of the pre-pressing block 51 and the pressing block 53 in sequence. The pre-pressing block 51 and the pressing block 53 press the metal nail 100 into the plastic tube 200, realizing the combination of the metal nail 100 and the plastic tube 200. After assembly, the nail head 101 of the metal nail 100 is located on the middle limiting plate 3, and the tube edge 201 of the top of the plastic tube 200 is located on the lower limiting plate 4.

[0055] like Figure 2 As shown, in order to ensure stable material supply, the feeding mechanism 1 also includes a limiting mechanism, which is disposed on the feeding chute 12; the limiting mechanism includes a connecting seat 13, a sliding rod 14, a return torsion spring 15, a connecting arm 16 and a limiting rod 17, the connecting seat 13 is disposed on the feeding chute 12; the sliding rod 14 is fixedly disposed on the connecting seat 13;

[0056] One end of the connecting arm 16 is connected to the limiting rod 17, and the other end is provided with a connecting hole 161; the connecting arm 16 is sleeved on the slide rod 14 through the connecting hole 161 and can rotate relative to the slide rod 14; the reset torsion spring 15 is provided on the slide rod 14 and connects the limiting rod 17 and the connecting seat 13; under normal working conditions, the limiting rod 17 is located directly above the feeding chute 12.

[0057] The feeding chute 12 is equipped with a limiting rod 17, which is swayably mounted on the slide rod 14 via a connecting arm 16. The top of the material in the feeding chute 12 is pressed down by the limiting rod 17, ensuring that all materials are neatly arranged on the feeding chute 12. On the one hand, the return torsion spring 15 provides a constant clamping force to the limiting rod 17. When conveying materials of different sizes, the limiting rod 17 can automatically adjust to a position at different distances from the feeding chute 12, exhibiting self-adaptive capability. On the other hand, when material gets stuck in the feeding chute 12, the operator can easily flip the limiting rod 17 open to remove the stuck material from the feeding chute 12. When the operator releases the limiting rod 17, it will press down on the material on the feeding chute 12 again under the drive of the return torsion spring 15, making daily maintenance convenient.

[0058] To increase the sliding range of the limiting rod 17, the connecting seat 13 extends upward from the side of the feeding chute 12, and both ends of the sliding rod 14 pass through the connecting seat 13. Preferably, in one embodiment, the sliding rod 14 is fixed by two connecting seats 13, and a connecting arm 16 is provided on the part of the sliding rod 14 located outside the two connecting seats 13. Since the two connecting arms 16 are fixedly connected to the limiting rod 17, the distance between the two connecting arms 16 is greater than the distance between the two connecting seats 13, and the connecting arms 16 are located on the outside of the two connecting seats 13, they will not detach from the sliding rod 14, but can slide on the sliding rod 14 with a predetermined stroke. With the above configuration, the end of the feeding chute 12 is provided with a horizontal conveying section 121, and the discharge end of the limiting rod 17 is provided with a horizontal limiting section 171 corresponding to the horizontal conveying section 121. A limiting plate can be directly set in front of the horizontal conveying section 121. Plastic tubes or metal nails in the feeding chute 12 can be directly fed into the corresponding limiting teeth 21 for automatic assembly. When a feeding problem occurs and the limiting rod 17 needs to be opened, the limiting rod 17 can be slightly lifted first. At this time, the end of the limiting rod 17 will interfere with the limiting plate. Moving the limiting rod 17 together with the connecting arm 16 towards the feeding side of the slide rod 14 will avoid the limiting plate and allow the limiting rod 17 to be fully opened. With the above structure, the limiting rod 17 can completely cover the entire conveying stroke of the feeding chute 12, avoiding the inability of the limiting rod 17 to cover certain parts and thus affecting the stability of material conveying.

[0059] Preferably, the lower surface of the feed end of the limiting rod 17 is provided with a first guide slope 172. The top of the material entering the feeding chute 12 gradually contacts the first guide slope 172, which can arrange and organize the material at the feed end to ensure smooth feeding.

[0060] In some embodiments, the feeding chute 12 is composed of two parallel chute plates 122. A reinforcing plate 123 is provided on the outer side of each chute plate 122, perpendicular to the chute plate 122 and extending along its upper edge. By providing a laterally extending reinforcing plate 123 in the feeding direction, the strength of the chute plate 122 can be improved, preventing the chute plate 122 from bending and affecting the smoothness of the feeding process.

[0061] Accordingly, a second embodiment of the present invention provides a method for producing combination screws, including the combination screw production equipment as described above, comprising the following steps:

[0062] (1) Combination Figure 6 As shown, the plastic tube 200 is fed into the limiting teeth of the lower limiting plate 4 by the first feeding mechanism 1a, which is connected to the lower limiting plate 4.

[0063] (2) The metal nail 100 is fed into the limiting teeth of the upper limiting plate 2 by the second feeding mechanism 1b located behind the first feeding mechanism 1a and connected to the upper limiting plate 2.

[0064] (3) As the upper limiting plate 2, the middle limiting plate 3 and the lower limiting plate 4 rotate synchronously, the metal nail 100 and the plastic tube 200 are driven through the pressing mechanism 5, and the metal nail 100 is pressed into the plastic tube 200 directly below it.

[0065] (4) The upper limiting plate 2, the middle limiting plate 3 and the lower limiting plate 4 continue to rotate synchronously. The pressed combined screws pass through the air blowing mechanism 7. The unqualified combined screws are blown away from the middle limiting plate 3 and the lower limiting plate 4 by the air blowing mechanism 7.

[0066] (5) The upper limit plate 2, the middle limit plate 3 and the lower limit plate 4 continue to rotate synchronously to deliver the qualified combination screws to the discharge station for discharge.

[0067] The above method uses the air blowing mechanism 7 to simultaneously realize the functions of quality inspection and rejection of defective products of the combination screws. Compared with the existing visual inspection equipment, the structure is simpler and the cost is lower. Moreover, it can be seamlessly matched with the rotation speed of each limit plate. It can automatically reject combination screws that do not meet the preset process, with high rejection efficiency, a wide range of defective products that can be rejected, and high accuracy.

[0068] Specifically, in step (4), the defective combination screw being blown away from the middle limiting plate 3 and the lower limiting plate 4 by the air blowing mechanism 7 means that: Figure 7As shown, if only the metal nail 100 passes through the air blowing mechanism 7, the upward-sloping air outlet 72 blows air upwards at the lower part of the metal nail 100, causing the nail head 101 of the metal nail 100 to disengage from the limiting teeth 21 of the middle limiting plate 3, and the metal nail 100 falls downwards; Figure 8 As shown, if only the plastic tube 200 passes through the air blowing mechanism 7, the downward-sloping air outlet 74 blows air downwards at the lower part of the plastic tube 200, causing the tube edge 201 of the plastic tube 200 to disengage from the limiting teeth 21 of the lower limiting plate 4, and the plastic tube 200 falls downwards; Figure 9 As shown, after the metal nail 100 and plastic tube 200 are combined and pass through the air blowing mechanism 7, the air pressure at the middle air outlet 73 will press the connection between the metal nail 100 and the plastic tube 200 tightly onto the lower limiting plate 4. The air pressure at the upward-sloping air outlet 72 on the metal nail 100 is symmetrical to the air pressure at the downward-sloping air outlet 74 on the plastic tube 200, firmly pressing the combination screw onto the middle limiting plate 3 and the lower limiting plate 4. Figure 10 As shown, if the metal nail 100 and the plastic tube 200 are not assembled in place, and the extension length of the metal nail 100 relative to the plastic tube 200 is greater than the process requirement, the metal nail 100 will be located at a higher position of the middle limiting plate 3. Therefore, when the combined screw contacts the upper inclined air outlet 72, the middle air outlet 73 and the lower inclined air outlet 74, due to the high center of gravity and large wind resistance of the metal nail 100, the combined screw will tilt backward and upward with the middle limiting plate 3 as the fulcrum. The edge of the plastic tube 200 will disengage from the limiting teeth of the lower limiting plate 4. When the combined screw follows the limiting plate through the air blowing position, the wind pressure disappears and the plastic tube 200, under the action of gravity, pulls the top metal nail 100 and falls into the defective product discharge trough below the recess 611.

[0069] The above method cleverly utilizes the difference in weight and position between the metal nail 100 and the plastic tube 200, and arranges three sets of air outlets. By utilizing the position and blowing angle of the air outlets, and in conjunction with the cooperation of the two major support parts of the nail head 101 and the plastic tube 200 along the lower limiting plate 4, the middle limiting plate 3, the lower screening ring 61 and the upper screening ring 62, the screening of the combined bolts can be completed. It can match different production speeds, has a simple structure, stable operation and convenient maintenance.

[0070] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A combination screw production equipment, characterized in that, It includes a feeding mechanism, an upper limiting plate, a middle limiting plate, a lower limiting plate, a pressing mechanism, and a sorting mechanism. The feeding mechanism includes a vibrating screen and a feeding chute. One end of the feeding chute is connected to the vibrating screen, and the other end is directly opposite the side wall of the corresponding upper or lower limiting plate. The upper limiting plate, middle limiting plate, and lower limiting plate are arranged sequentially on the rotating shaft from top to bottom; the edges of the upper limiting plate, middle limiting plate, and lower limiting plate are all provided with limiting teeth; The pressing mechanism is located on the side of the upper limiting plate and includes a pre-pressing block. The bottom surface of the pre-pressing block gradually slopes downward along the rotation direction of the upper limiting plate. The sorting mechanism is located on the discharge side of the lower limiting plate and is used to remove incomplete assembly screws. It includes a lower screening ring located outside the lower limiting plate and an upper screening ring located outside the middle limiting plate. The lower screening ring maintains a predetermined gap with the lower limiting plate. The lower screening ring is equipped with an air blowing mechanism that blows air onto the lower limiting plate; the upper screening ring maintains a predetermined gap with the middle limiting plate; The lower screening ring has a recess on the side facing the lower limiting plate, and the air blowing mechanism is provided on the recess; The lower screening ring includes an annular groove and an annular top cover. The annular top cover is located at the top of the annular groove. The recessed portion is composed of a first inclined side, a clearance surface, and a second inclined side located on the side wall of the annular groove, connected in sequence. The air blowing mechanism includes an air supply pipe, an air outlet, and an air source. The air outlet is located on the clearance surface and includes an upward-sloping air outlet, a middle air outlet, and a downward-sloping air outlet. The upward-sloping air outlet, the middle air outlet, and the downward-sloping air outlet are arranged sequentially at different heights on the same vertical line. The upward-sloping air outlet can blow air upwards at an angle, the middle air outlet can blow air horizontally, and the downward-sloping air outlet can blow air downwards at an angle. The pressing mechanism further includes an arc-shaped push block located in front of the pre-pressing block and a pressing block located behind the pre-pressing block. The angle between the bottom surface of the pressing block and the horizontal plane is greater than the angle between the bottom surface of the pre-pressing block and the horizontal plane. The arc-shaped push block has a pushing top surface that extends outward relative to the upper limiting plate.

2. The combined screw production equipment as described in claim 1, characterized in that, The feeding mechanism also includes a limiting mechanism. The limiting mechanism is provided on the feeding chute; The limiting mechanism includes a connecting seat, a sliding rod, a reset torsion spring, a connecting arm, and a limiting rod, wherein the connecting seat is disposed on the feeding chute; The slide bar is fixedly mounted on the connecting seat; One end of the connecting arm is connected to the limiting rod, and the other end is provided with a connecting hole; The connecting arm is sleeved on the slide rod through the connecting hole and can rotate relative to the slide rod; The reset torsion spring is mounted on the slide rod and connects the limiting rod and the connecting seat; Under normal operating conditions, the limiting rod is located directly above the feeding chute.

3. The combined screw production equipment as described in claim 2, characterized in that, The connecting seat extends upward from the side of the feeding chute, and both ends of the sliding rod pass through the connecting seat; the lower surface of the feeding end of the limiting rod is provided with a first guiding slope; the end of the feeding chute is provided with a horizontal conveying section, and the discharge end of the limiting rod is provided with a horizontal limiting section corresponding to the horizontal conveying section.

4. The combined screw production equipment as described in claim 3, characterized in that, The feeding chute consists of two parallel chute plates, and the outer side of the chute plate is provided with a reinforcing plate that is perpendicular to the chute plate and extends along the upper edge of the chute plate.

5. A method for producing composite screws, characterized in that, The assembly screw production equipment as described in any one of claims 1-4 includes the following steps: (1) The plastic tube is fed into the limiting teeth of the lower limiting plate by the first feeding mechanism that docks with the lower limiting plate; (2) The metal nail is fed into the limiting teeth of the upper limiting plate by the second feeding mechanism located behind the first feeding mechanism and connected to the upper limiting plate; (3) As the upper limiting plate, the middle limiting plate and the lower limiting plate rotate synchronously, the metal nail box and the plastic tube are driven through the pressing mechanism to press the metal nail into the plastic tube directly below it. (4) The upper limit plate, the middle limit plate and the lower limit plate continue to rotate synchronously. The combined screws that have been pressed together pass through the air blowing mechanism. The unqualified combined screws are blown away from the middle limit plate and the lower limit plate by the air blowing mechanism. (5) The upper limit plate, the middle limit plate and the lower limit plate continue to rotate synchronously to deliver the qualified combination screws to the discharge station for discharge.

6. The method for producing combined screws as described in claim 5, characterized in that, Step (4) The defective combination screws being blown away from the middle and lower limiting plates by the air blowing mechanism means: If only the metal nail passes through the air blowing mechanism, the upward-sloping air outlet blows air upwards at the lower part of the metal nail, causing the nail head to disengage from the limiting teeth of the middle limiting plate, and the metal nail falls downwards. If only the plastic tube passes through the air blowing mechanism, the downward-sloping air outlet blows air downwards at the lower part of the plastic tube, causing the edge of the plastic tube to disengage from the limiting teeth of the lower limiting plate, and the plastic tube falls downwards. If the metal nail and plastic tube are combined and then pass through the air blowing mechanism, the air pressure at the middle air outlet will press the connection between the metal nail and the plastic tube tightly onto the lower limiting plate. The air pressure at the upper sloping air outlet on the metal nail and the air pressure at the lower sloping air outlet on the plastic tube are symmetrical, firmly pressing the combination screw onto the middle and lower limiting plates.

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