Combined screw production equipment

Abstract

The combined screw production equipment 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, and the feeding mechanism comprises a vibrating screen and a feeding chute; the pressing mechanism is arranged on the side face of the upper-layer limiting disc and comprises a pre-pressing block, and the bottom face of the pre-pressing block gradually inclines downwards in 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 on the outer side of the lower-layer limiting disc and an upper screening ring arranged on the outer side of the middle-layer limiting disc, and a preset gap is kept between the lower screening ring and the lower-layer limiting disc; the lower screening ring is provided with an air blowing mechanism for blowing air to the lower-layer limiting disc; and a preset gap is kept between the upper screening ring and the middle-layer limiting disc. By the adoption of the combined screw assembling machine, respective feeding and assembling of metal screws and plastic pipes can be automatically achieved, and unqualified combined screws are automatically removed after assembling.

Description

Technical Field

[0001] The invention relates to the field of combined screw production, and in particular to a combined screw production device. Background Art

[0002] Combination screws refer to screws with additional structures in addition to the conventional nail body. Depending on the function, the structure combined with the nail body is also different. Generally, it is a plastic component of various shapes that is sleeved at the bottom of the nail body. If a plastic tube is connected to the bottom of the nail body, an expansion screw can be formed. In the field of industrial assembly, expansion screws are often used for component installation. Expansion screws mainly include plastic tubes and metal nails. During the installation process, the metal nails extend into the plastic tubes to open the plastic tubes, thereby connecting and fixing different components. In the production equipment of expansion screws, a feeding mechanism is often used to independently feed metal nails and plastic tubes. The feeding mechanism includes a vibrating screen and a feeding slide rail. However, since the plastic tube is light, it is easy to tilt or get stuck when transported in the feeding slide rail, affecting the stability of feeding. In addition, the combination speed of the screws is fast, often reaching a speed of hundreds of screws per minute. It is difficult to quickly remove the combination failure or the independent nail body or plastic tube from the finished product, and manual sorting is required, 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] In order to solve the defects of the prior art, the present invention provides a combined screw production device, which can automatically realize the separate feeding and combination of metal nails and plastic tubes, and automatically remove unqualified combined screws after the combination.

[0004] In order to solve the above technical problems, the present invention provides a combined screw production device, including 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 comprises 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 to the side wall of the corresponding upper limit plate or lower limit plate;

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

[0007] The pressing mechanism is arranged on the side of the upper limiting disk, and comprises a pre-pressing block, the bottom surface of which is gradually inclined downward along the rotation direction of the upper limiting disk;

[0008] The sorting mechanism is arranged on the discharge side of the lower limit disk, and is used to remove the unassembled combination screws. It includes a lower screening ring arranged on the outer side of the lower limit disk and an upper screening ring arranged on the outer side of the middle limit disk. The lower screening ring maintains a predetermined gap with the lower limit disk; the lower screening ring is provided with a blowing mechanism for blowing air toward the lower limit disk; the upper screening ring maintains a predetermined gap with the middle limit disk.

[0009] As an improvement of the above solution, a recessed portion is provided on a side of the lower screening ring facing the lower limiting disk, and the blowing mechanism is provided on the recessed portion.

[0010] As an improvement of the above solution, the lower screening ring includes an annular groove body and an annular upper cover, the annular upper cover is arranged on the top of the annular groove body, and the recessed portion is composed of a first bevel, an avoidance surface and a second bevel located on the side wall of the annular groove body connected in sequence.

[0011] As an improvement of the above-mentioned scheme, the blowing mechanism includes an air supply pipe, an air outlet and an air source, and the air outlet is arranged on the avoidance surface, including an upper inclined air outlet, a middle air outlet and a lower inclined air outlet; the upper inclined air outlet, the middle air outlet and the lower inclined air outlet are arranged in sequence at different heights on the same vertical line, the upper inclined air outlet can blow air obliquely upward, the middle air outlet can blow air horizontally, and the lower inclined air outlet can blow air obliquely downward.

[0012] As an improvement of the above-mentioned scheme, the pressing mechanism also 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 push top surface extending outward relative to the upper limit plate.

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

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

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

[0016] The sliding rod is fixed 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 sliding rod through the connecting hole and can rotate relative to the sliding rod;

[0019] The return torsion spring is arranged on the slide rod and connects the limit rod and the connecting seat;

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

[0021] As an improvement of the above-mentioned scheme, the connecting seat extends upward from the side of the feeding chute, and the two 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.

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

[0023] Accordingly, the present invention also provides a method for producing a combined screw, comprising the combined screw production device as described above, comprising the following steps:

[0024] (1) feeding the plastic tube into the limiting teeth of the lower limiting disk through a first feeding mechanism connected to the lower limiting disk;

[0025] (2) feeding the metal nails into the limiting teeth of the upper limiting disk through a second feeding mechanism located behind the first feeding mechanism and docking with the upper limiting disk;

[0026] (3) With the synchronous rotation of the upper limiting disk, the middle limiting disk and the lower limiting disk, the metal nail and the plastic tube are driven through the pressing mechanism, and the metal nail is pressed 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, and the pressed combination screws pass through the blowing mechanism, and the unqualified combination screws are blown away from the middle limit plate and the lower limit plate by the blowing mechanism;

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

[0029] As an improvement of the above scheme, in step (4), the unqualified combination screws are blown away from the middle limit plate and the lower limit plate by the blowing mechanism, which means that: if only the metal nail passes through the blowing mechanism, the upper inclined air outlet blows air obliquely upward to the lower part of the metal nail, so that the nail head of the metal nail is separated from the limiting teeth of the middle limit plate, and the metal nail falls downward; if only the plastic tube passes through the blowing mechanism, the lower inclined air outlet blows air obliquely downward to the lower part of the plastic tube, so that the tube edge of the plastic tube is separated from the limiting teeth of the lower limit plate, and the plastic tube falls downward; if the metal nail and the plastic tube are combined and pass through the blowing mechanism, the wind pressure of the middle air outlet will press the connection between the metal nail and the plastic tube onto the lower limit plate, and the pressure of the wind pressure of the upper inclined air outlet on the metal nail is symmetrical with the pressure of the wind pressure of the lower inclined air outlet on the plastic tube, so that the combination screw is firmly pressed against the middle limit plate and the lower limit plate.

[0030] The implementation of the present invention has the following beneficial effects:

[0031] By adopting the above structure, the metal nails and the plastic tubes can be automatically fed and combined separately, and the sorting mechanism can automatically remove unqualified combined screws to ensure the yield rate of the products reaching the discharge port.

[0032] The air outlet is arranged on the avoidance surface, including an upper inclined air outlet, a middle air outlet and a lower inclined air outlet, which can emit airflows in different directions to different parts of the combination screw at different positions, and cooperate with the middle limit plate and the upper screening ring for guiding the metal nails, and the lower limit plate and the lower screening ring for guiding the plastic pipe, so as to remove unqualified combination screws or their components.

[0033] The feed chute is provided with a limit rod, which is swingably arranged on the slide bar through a connecting arm. The top of the material in the feed chute is pressed by the limit rod, which can ensure that all materials are neatly arranged on the feed chute. On the one hand, the reset torsion spring provides a constant pressing force for the limit rod. When conveying materials of different sizes, the limit rod can automatically adjust to positions at different distances from the feed chute, and has adaptive capabilities; on the other hand, when materials are stuck in the feed chute, the operator can easily flip the limit rod to remove the stuck materials from the feed chute. When the operator releases the limit rod, the limit rod will re-press the materials on the feed chute under the drive of the reset torsion spring, which is convenient for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0038] Figure 5 It is a schematic structural diagram of an annular tank body according to an embodiment of the present invention;

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

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

[0041] Figure 8 This is a schematic diagram of the screening principle when the sorting mechanism of one embodiment of the present invention passes through a single plastic tube;

[0042] Fig. 9 This is a screening principle diagram of a sorting mechanism according to an embodiment of the present invention after the assembled screw combination is completed;

[0043] Fig.10 It is a screening principle diagram of a sorting mechanism according to an embodiment of the present invention when passing through a combination screw that is not fully assembled. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0045] like Figure 1 As shown, the first embodiment of the present invention provides a combined screw production device, 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 on the rotating shaft 5 in sequence from top to bottom; 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 arranged on the side of the upper limiting plate 2, and comprises a pre-pressing block 51, and 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 arranged on the discharge side of the lower limit plate 4, and is used to remove the unassembled combination screws, including a lower screening ring 61 arranged on the outer side of the lower limit plate 4 and an upper screening ring 62 arranged on the outer side of the middle limit plate 3, the lower screening ring 61 maintains a predetermined gap with the lower limit plate 4; the lower screening ring 61 is provided with a blowing mechanism 7 for blowing air toward the lower limit plate 4; the upper screening ring 62 maintains a predetermined gap with the middle limit plate 3.

[0050] By adopting the above structure, the metal nails and plastic tubes can be automatically fed and combined separately, and the sorting mechanism 6 can automatically remove unqualified combined screws to ensure the yield rate of reaching the discharge port.

[0051] Preferably, combined Figure 5 As shown, a concave portion 611 is provided on the side of the lower screening ring 61 facing the lower limiting plate 4, and the blowing mechanism 7 is provided on the concave portion 611. The lower screening ring 61 comprises an annular groove body 612 and an annular upper cover 613, wherein the annular upper cover 613 is arranged on the top of the annular groove body 612, and the concave portion 611 is composed of a first bevel 614, an avoidance surface 615 and a second bevel 616 located on the side wall of the annular groove body 612, connected in sequence.

[0052] like Figure 7-10 As shown, the blowing mechanism 7 includes an air supply pipe 71, an air outlet and an air source, and the air outlet is arranged on the avoidance surface 615, including an upper oblique air outlet 72, a middle air outlet 73 and a lower oblique air outlet 74; the upper oblique air outlet 72, the middle air outlet 73 and the lower oblique air outlet 74 are arranged in sequence at different heights of the same vertical line, the upper oblique air outlet 72 can blow air obliquely upward, the middle air outlet 73 can blow air horizontally, and the lower oblique air outlet 74 can blow air obliquely downward.

[0053] It should be noted that, by providing a recessed portion 611 on the side of the lower screening ring 61 facing the lower limiting plate 4, the air blowing mechanism 7 is provided on the recessed portion 611. This allows the combination screw to have a space to fall in the recessed portion 611, and the recessed portion 611 is composed of a first bevel 614, an avoidance surface 615, and a second bevel 616 located on the side wall of the annular groove body 612, which are connected in sequence, and can form a space with a gradually increasing opening, so that the air blown out by the air blowing mechanism 7 can be diffused outward, and turbulence is avoided from being generated by the blown wind, which affects the normal combination screws and causes the normal combination screws to fall in the recessed portion 611. The air outlet is arranged on the avoidance surface 615, including an upper inclined air outlet 72, a middle air outlet 73 and a lower inclined air outlet 74, which can emit airflows in different directions to different parts of the combination screw at different positions, and cooperate with the middle limit plate 3 and the upper screening ring 62 for guiding the metal nails, and the lower limit plate 4 and the lower screening ring 61 for guiding the plastic pipe, so as to remove unqualified combination screws or their components.

[0054] like Figure 3 As shown, the pressing mechanism 5 also 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 push-up surface extending outward relative to the upper limit plate 2. During the pressing process, the nail head 101 of the metal nail 100 located in the upper limit plate 2 first contacts with the arc-shaped push block 52, and the arc-shaped push block 52 pushes the nail head 101 outward, so that the metal nail 100 is separated from the upper limit plate 2 and falls into the plastic tube 200; then the top of the metal nail 100 contacts with the bottom surfaces of the pre-pressing block 51 and the pressing block 53 in turn, and the pre-pressing block 51 and the pressing block 53 press the metal nail 100 into the plastic tube 200, so as to realize the combination of the metal nail 100 and the plastic tube 200. After the assembly is completed, the nail head 101 of the metal nail 100 is located on the middle limiting plate 3, and the tube edge 201 at 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 feeding, the feeding mechanism 1 further includes a limiting mechanism, which is arranged on the feeding chute 12; the limiting mechanism includes a connecting seat 13, a slide bar 14, a return torsion spring 15, a connecting arm 16 and a limiting rod 17, the connecting seat 13 is arranged on the feeding chute 12; the slide bar 14 is fixedly arranged 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 sliding rod 14 through the connecting hole 161, and can rotate relative to the sliding rod 14; the return torsion spring 15 is provided on the sliding rod 14, connecting 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 feed chute 12 is provided with a limit rod 17, which is swingably arranged on the slide bar 14 through a connecting arm 16. The top of the material in the feed chute 12 is pressed by the limit rod 17, which can ensure that all materials are neatly arranged on the feed chute 12. On the one hand, the reset torsion spring 15 provides a constant pressing force for the limit rod 17. When conveying materials of different sizes, the limit rod 17 can automatically adjust to a position at a different distance from the feed chute 12, and has adaptive ability; on the other hand, when the material is stuck in the feed chute 12, the operator can easily turn over the limit rod 17 to take the stuck material out of the feed chute 12. When the operator releases the limit rod 17, the limit rod 17 will re-press the material on the feed chute 12 under the drive of the reset torsion spring 15, which is convenient for daily maintenance.

[0058] In order to increase the sliding range of the limit rod 17, the connecting seat 13 extends upward from the side of the feeding chute 12, and the two ends of the slide bar 14 pass through the connecting seat 13; preferably, in one embodiment, the slide bar 14 is fixed by the two connecting seats 13, and the slide bar 14 is provided with a connecting arm 16 at the position outside the two connecting seats 13. Since the two connecting arms 16 are fixedly connected to the limit rod 17, the distance between the two connecting arms 16 is greater than the distance between the two connecting seats 13, and the two connecting seats 13 are provided outside, the connecting arm 16 will not be separated from the slide bar 14, but can slide on the slide bar 14 with a predetermined stroke. Through the above arrangement, the end of the feeding chute 12 is provided with a horizontal conveying section 121, and the discharging end of the limit rod 17 is provided with a horizontal limit section 171 corresponding to the horizontal conveying section 121, and a limit plate can be directly provided in front of the horizontal conveying section 121. The plastic tube or metal nail in the feeding chute 12 can be directly fed into the corresponding limiting teeth 21, and then automatically assembled; when there is a problem with feeding and the limiting rod 17 needs to be opened, the limiting rod 17 can be slightly lifted first, and the end of the limiting rod 17 will interfere with the limiting disk. The limiting rod 17 and the connecting arm 16 are moved to the feeding side of the slide bar 14 to avoid the limiting disk and fully open the limiting rod 17. With the above structure, the limiting rod 17 can completely cover the entire conveying stroke of the feeding chute 12, avoiding the limiting rod 17 from covering some positions and 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 guiding slope 172. The top of the material entering the feeding chute 12 gradually contacts the first guiding slope 172, and the material can be arranged and sorted at the feed end to ensure smooth feeding.

[0060] In some embodiments, the feeding chute 12 is composed of two parallel slot plates 122, and the outer side of the slot plate 122 is provided with a reinforcing plate 123 which is perpendicular to the slot plate 122 and extends along the upper edge of the slot plate 122. By providing the reinforcing plate 123 extending laterally in the feeding direction, the strength of the slot plate 122 can be improved to prevent the slot plate 122 from bending and affecting the smooth feeding.

[0061] Accordingly, the second embodiment of the present invention provides a method for producing a combined screw, including the combined screw production device 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 disk 4 through the first feeding mechanism 1a docking with the lower limiting disk 4;

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

[0064] (3) With the synchronous rotation of the upper limiting plate 2, the middle limiting plate 3 and the lower limiting plate 4, 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 limit plate 2, the middle limit plate 3 and the lower limit plate 4 continue to rotate synchronously, and the pressed combination screws pass through the blowing mechanism 7, and the unqualified combination screws are blown away from the middle limit plate 3 and the lower limit plate 4 by the blowing mechanism 7;

[0066] (5) The upper limiting disk 2, the middle limiting disk 3 and the lower limiting disk 4 continue to rotate synchronously, and the qualified combination screws are sent to the discharging station for discharging.

[0067] The above method adopts the blowing mechanism 7 to simultaneously realize the functions of quality inspection and rejection of defective combination screws. Compared with the existing visual inspection equipment, it has a simpler structure and low cost, and can seamlessly match the rotation speed of each limit plate. It can automatically reject the combination screws that do not meet the preset process, has high rejection efficiency, can reject many types of defective products, and has high accuracy.

[0068] Specifically, in step (4), the unqualified assembled screws are blown away from the middle limit plate 3 and the lower limit plate 4 by the blowing mechanism 7, which means: Figure 7As shown, if only the metal nail 100 passes through the blowing mechanism 7, the upper oblique air outlet 72 blows air obliquely upward to the lower part of the metal nail 100, so that the nail head 101 of the metal nail 100 is separated from the limiting teeth 21 of the middle limiting plate 3, and the metal nail 100 falls downward; Figure 8 As shown, if only the plastic tube 200 passes through the blowing mechanism 7, the downwardly inclined air outlet 74 blows air obliquely downward to the lower part of the plastic tube 200, so that the tube edge 201 of the plastic tube 200 is separated from the limiting teeth 21 of the lower limiting plate 4, and the plastic tube 200 falls downward; Fig. 9 As shown, if the metal nail 100 and the plastic tube 200 are assembled and passed through the blowing mechanism 7, the wind pressure of the middle air outlet 73 will press the connection between the metal nail 100 and the plastic tube 200 onto the lower limit plate 4, and the wind pressure of the upper oblique air outlet 72 on the metal nail 100 and the wind pressure of the lower oblique air outlet 74 on the plastic tube 200 are symmetrical, and the combined screws are firmly pressed onto the middle limit plate 3 and the lower limit plate 4. Fig.10 As shown, if the metal nail 100 and the plastic tube 200 are not assembled in place, and the protruding 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 limit 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 use the middle limit plate 3 as a fulcrum and tilt upward and backward, and the edge of the plastic tube 200 will be disengaged from the limiting teeth of the lower limit plate 4. When the combined screw follows the limiting plate through the blowing position, the wind pressure disappears and the plastic tube 200, under the action of gravity, pulls the metal nail 100 at the top and falls into the defective product discharge trough below the recessed portion 611.

[0069] The above method cleverly utilizes the difference in weight and weight position between the metal nail 100 and the plastic tube 200, arranges three groups of air outlets, utilizes the position of the air outlets and the blowing angle, cooperates with the two major supporting parts along the nail head 101 and the plastic tube 200 located at the lower limit plate 4, the middle limit plate 3, the lower screening ring 61 and the upper screening ring 62, to complete the screening of the combined bolts, can match different production speeds, has a simple structure, stable operation, and convenient maintenance.

[0070] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A combined 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 comprises 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 to the side wall of the corresponding upper limit plate or lower limit plate; The upper limiting disk, the middle limiting disk and the lower limiting disk are arranged on the rotating shaft in sequence from top to bottom; the edges of the upper limiting disk, the middle limiting disk and the lower limiting disk are all provided with limiting teeth; The pressing mechanism is arranged on the side of the upper limiting disk, and comprises a pre-pressing block, the bottom surface of which is gradually inclined downward along the rotation direction of the upper limiting disk; The sorting mechanism is arranged at the discharge side of the lower limiting disk, and is used to remove the unassembled assembly screws, and comprises a lower screening ring arranged at the outer side of the lower limiting disk and an upper screening ring arranged at the outer side of the middle limiting disk, and the lower screening ring maintains a predetermined gap with the lower limiting disk; The lower screening ring is provided with a blowing mechanism for blowing air toward the lower limiting disk; the upper screening ring maintains a predetermined gap with the middle limiting disk.

2. The combined screw production equipment according to claim 1, characterized in that: A concave portion is provided on one side of the lower screening ring facing the lower limiting disk, and the blowing mechanism is provided on the concave portion.

3. The combined screw production equipment according to claim 2, characterized in that: The lower screening ring comprises an annular groove body and an annular upper cover, wherein the annular upper cover is arranged on the top of the annular groove body, and the recessed portion is composed of a first bevel, an avoidance surface and a second bevel located on the side wall of the annular groove body connected in sequence.

4. The combined screw production equipment according to claim 3, characterized in that: The air blowing mechanism includes an air supply pipe, an air outlet and an air source. The air outlet is arranged on the avoidance surface, including an upper oblique air outlet, a middle air outlet and a lower oblique air outlet; the upper oblique air outlet, the middle air outlet and the lower oblique air outlet are arranged in sequence at different heights of the same vertical line, the upper oblique air outlet can blow air obliquely upward, the middle air outlet can blow air horizontally, and the lower oblique air outlet can blow air obliquely downward.

5. The combined screw production equipment according to claim 1, characterized in that: The pressing mechanism also 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 push top surface extending outward relative to the upper limit plate.

6. The combined screw production equipment according to claim 1, characterized in that: The feeding mechanism also includes a limiting mechanism. The limiting mechanism is arranged on the feeding chute; The limiting mechanism comprises a connecting seat, a sliding rod, a reset torsion spring, a connecting arm and a limiting rod, wherein the connecting seat is arranged on the feeding chute; The sliding rod is fixed 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 sliding rod through the connecting hole and can rotate relative to the sliding rod; The return torsion spring is arranged on the slide rod and connects the limit rod and the connecting seat; Under normal working conditions, the limit rod is located directly above the feeding chute.

7. The combined screw production equipment according to claim 6, characterized in that: The connecting seat extends upward from the side of the feeding chute, and the two 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.

8. The combined screw production equipment according to claim 7, characterized in that: The feeding chute is composed of two parallel slot plates, and the outer side of the slot plates is provided with a reinforcing plate which is perpendicular to the slot plates and extends along the upper edge of the slot plates.

9. A method for producing a combination screw, characterized in that: The combined screw production device according to any one of claims 1 to 8 comprises the following steps: (1) feeding the plastic tube into the limiting teeth of the lower limiting disk through a first feeding mechanism connected to the lower limiting disk; (2) feeding the metal nails into the limiting teeth of the upper limiting disk through a second feeding mechanism located behind the first feeding mechanism and docking with the upper limiting disk; (3) With the synchronous rotation of the upper limiting disk, the middle limiting disk and the lower limiting disk, the metal nail and the plastic tube are driven through the pressing mechanism, and the metal nail is pressed 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, and the pressed combination screws pass through the blowing mechanism, and the unqualified combination screws are blown away from the middle limit plate and the lower limit plate by the blowing mechanism; (5) The upper limit plate, the middle limit plate and the lower limit plate continue to rotate synchronously, and the qualified combination screws are sent to the discharging station for discharging.

10. The method for producing a combination screw according to claim 9, characterized in that: Step (4) The unqualified combination screws are blown off the middle limit plate and the lower limit plate by the blowing mechanism, which means: If only the metal nail passes through the blowing mechanism, the upper oblique air outlet blows air obliquely upward to the lower part of the metal nail, so that the nail head of the metal nail is separated from the limiting teeth of the middle limiting plate, and the metal nail falls downward; If only the plastic tube passes through the blowing mechanism, the downward oblique air outlet blows air obliquely downward to the lower part of the plastic tube, so that the edge of the plastic tube is separated from the limiting teeth of the lower limiting plate, and the plastic tube falls downward; If the metal nail and the plastic tube are combined and then pass through the blowing mechanism, the wind pressure from the middle air outlet will press the connection between the metal nail and the plastic tube onto the lower limit plate. The pressure of the wind pressure from the upper inclined air outlet on the metal nail is symmetrical to the pressure of the wind pressure from the lower inclined air outlet on the plastic tube, pressing the combined screws firmly onto the middle limit plate and the lower limit plate.

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