Screw positioning structure of screw machine

Abstract

The utility model discloses a screw positioning structure of a screw machine, which relates to the field of automobile part production and is characterized by comprising a support plate connected with an external lifting device, a driving seat is arranged on one side of the support plate, and a transmission shaft is arranged at the bottom of the driving seat. A rotating motor for driving the transmission shaft to rotate is arranged at the top of the driving seat, and an adsorption connecting rod is arranged at the bottom of the transmission shaft. The problems that when the hexagonal screw is smaller than the limiting groove, the contact area of the hexagonal screw and the limiting groove of the screwing-in head is insufficient, the transmission efficiency of the electric driving torque is reduced, and even idling occurs, and when the hexagonal screw is larger than the limiting groove, the electric driving torque is not matched with the limiting groove in shape are solved. The technical problem that automobile parts are inconvenient to machine due to the fact that the hexagonal screws cannot be loaded in the limiting grooves is solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing, and in particular to a screw positioning structure for a screw machine. Background Technology

[0002] Vacuum screw machines are core tools in automated assembly equipment, mainly used for gripping, positioning, and tightening screws, and are widely used in the automotive manufacturing industry. Their core function is to create negative pressure inside the screw-in head using a vacuum adsorption system to attract the screw. Considering the geometric characteristics of hexagonal screws, a limiting groove is typically set inside the screw-in head. This hexagonal limiting groove matches the shape of the hexagonal screw head, ensuring the screw is contained within the groove. Combined with a servo motor, precise screwing is achieved. Compared to traditional manual or semi-automatic tools, vacuum screw machines offer advantages such as high efficiency, high precision, and low human intervention, making them particularly suitable for mass assembly of automotive parts (such as engine components, chassis fasteners, and interior modules).

[0003] However, since the current screw-in head's limiting groove can only match a single type of hexagonal screw, if different types of hexagonal screws need to be screwed in, it will cause a mismatch between the shape of the limiting groove and the hexagonal screw. For example, when the hexagonal screw is smaller than the limiting groove, the contact area between the hexagonal screw and the limiting groove of the screw-in head is insufficient, resulting in reduced electric drive torque transmission efficiency and even free rotation. If the hexagonal screw is larger than the limiting groove, it will cause the hexagonal screw to be unable to be installed in the limiting groove, causing inconvenience in the processing of automotive parts. Utility Model Content

[0004] To solve the aforementioned technical problems, this utility model provides a screw positioning structure for a screw-making machine. The purpose is to address the issue that current screw-in heads can only accommodate a single type of hexagonal screw. If different types of hexagonal screws need to be screwed in, the shape of the screw-in head and the hexagonal screw will not match. For example, when the hexagonal screw is smaller than the screw-in head, the contact area between the hexagonal screw and the screw-in head's screw-in head is insufficient, leading to reduced electric drive torque transmission efficiency and even idle rotation. Conversely, when the hexagonal screw is larger than the screw-in head, it cannot be loaded into the screw-in head, causing inconvenience in the processing of automotive parts.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A screw positioning structure for a screw machine includes a support plate connected to an external lifting device. A drive seat is located on one side of the support plate, a drive shaft is located at the bottom of the drive seat, and a rotary motor for driving the drive shaft is located at the top of the drive seat. An adsorption connecting rod is located at the bottom of the drive shaft. One end of the adsorption connecting rod has a screw-in head with a limiting groove at its bottom. One end of the adsorption connecting rod has a connecting end with a mounting groove at its end. The screw-in head is inserted into the mounting groove. A connecting slot communicating with the limiting groove is located at the top of the screw-in head. A vacuum suction head is located inside the mounting groove and connected to an external vacuum pump. The vacuum suction head passes through the mounting groove, positioning itself inside the limiting groove. A first fixing hole is located on the outer edge of the screw-in head, and a second fixing hole communicating with the mounting groove is located on the outer edge of the connecting end. A fixing bolt passes through the second fixing hole and is threaded into the first fixing hole.

[0007] The mounting slot and the insertion head have a standardized interface design. There are multiple insertion heads, each with a limiting slot adapted to a specific type of hexagonal screw. When the type of hexagonal screw to be inserted changes, the screw size also changes. Therefore, the corresponding limiting slot of the insertion head is selected, and the insertion head is inserted into the mounting slot of the suction connecting rod. The connection slot connects the vacuum head to the limiting slot. The fixing bolt passes through the second fixing hole and engages with the threaded first fixing hole to fix the insertion head. The negative pressure from the external vacuum pump is transmitted through the connection slot to the top of the limiting slot, adsorbing the head of the hexagonal screw and pressing it firmly against the bottom of the limiting slot. The hexagonal inner cavity of the limiting slot provides circumferential limiting for the hexagonal screw. When the rotary motor drives the drive shaft to rotate, the drive shaft drives the insertion head to screw the hexagonal screw into the automotive part. This allows the insertion head to adapt to changes in the size of the hexagonal screw, improving the stability of screw insertion.

[0008] Furthermore, in this application, the top of the screw-in head is provided with a sealing gasket, the sealing gasket is annular in shape, the sealing gasket is elastic, the sealing gasket abuts against the top of the mounting groove, and the vacuum suction head passes through the inner ring of the sealing gasket.

[0009] The annular sealing gasket is made of an elastic material (such as silicone, fluororubber, or polyurethane). Its inner ring diameter is slightly smaller than the outer diameter of the vacuum head, and the outer ring diameter matches the top end face of the screw-in head. When the screw-in head is inserted into the mounting groove, the sealing gasket is compressed by the top plane of the mounting groove. It fills the tiny gap between the screw-in head and the mounting groove by elastic deformation, forming a double seal in the radial and axial directions. This prevents gas from leaking from the second fixing hole and affecting the adsorption effect of the hexagonal screw.

[0010] Furthermore, in this application, the bottom of the sealing gasket is provided with a fixing post, the fixing post is elastic, and the top of the screw-in head is provided with a fixing groove, the fixing post engaging with the fixing groove.

[0011] When the elasticity of the sealing gasket decreases due to long-term use, the gasket can be pulled out by pulling it out, so that the pulling force of the fixing pin is greater than that of the fixing groove, and the fixing pin can be pulled out to facilitate the replacement of the sealing gasket.

[0012] Furthermore, in this application, the mounting groove has multiple mounting slots inside, and the outer edge of the screw-in head has multiple mounting sliders, with the multiple mounting sliders slidingly engaging with the multiple mounting slots respectively.

[0013] Furthermore, in this application, a connecting seat is provided on one side of the support plate, and an air slip ring is provided inside the connecting seat. The adsorption connecting rod passes through the interior of the air slip ring, so that the adsorption connecting rod is rotatably connected to the rotor of the air slip ring. A vacuum cavity is opened inside the adsorption connecting rod. The rotor of the air slip ring is connected to a connecting air pipe. One end of the connecting air pipe is connected to the vacuum cavity. A connecting air valve is provided on one side of the connecting seat, which is connected to the interior of the stator of the air slip ring. The connecting air valve is connected to an external vacuum pump.

[0014] Furthermore, in this application, a buffer plate is provided on one side of the connecting seat, the buffer plate is located above the connecting seat, a plurality of buffer springs are provided on the top of the connecting seat, one end of the buffer spring is connected to the bottom of the buffer plate, the other end of the adsorption connecting rod is provided with a movable rod, a guide seat is provided at the bottom of the transmission shaft, a movable cavity is opened at the bottom of the guide seat, and the movable rod slides in cooperation with the movable cavity.

[0015] Furthermore, in this application, the guide seat has guide grooves on both sides that communicate with the movable cavity, the movable rod has a mounting hole inside, a guide rod passes through the mounting hole, and the two ends of the guide rod extend into the adjacent guide groove, and the two ends of the guide rod slide in cooperation with the guide grooves on both sides of the guide seat.

[0016] Furthermore, in this application, the guide rod has limiting plates at both ends, such that the limiting plates at both ends of the guide rod are located on both sides of the guide seat, and the width of the limiting plates is larger than the width of the guide groove.

[0017] Furthermore, in this application, the top of the connecting seat is provided with a plurality of sliding rods, the plurality of sliding rods are respectively located inside the plurality of buffer springs, the buffer plate is provided with a plurality of sliding guide grooves, one end of the plurality of sliding rods respectively passes through the plurality of sliding guide grooves, and one end of the plurality of sliding rods respectively slides in cooperation with the plurality of sliding guide grooves.

[0018] Furthermore, in this application, one end of the sliding rod is provided with a limiting block, the size of which is larger than the size of the sliding guide groove, and the limiting block is located above the buffer plate.

[0019] This utility model has the following beneficial effects:

[0020] The mounting slot and the insertion head have a standardized interface design. There are multiple insertion heads, each with a limiting slot adapted to a specific type of hexagonal screw. When the type of hexagonal screw to be inserted changes, the screw size also changes. Therefore, the corresponding limiting slot of the insertion head is selected, and the insertion head is inserted into the mounting slot of the suction connecting rod. The connection slot connects the vacuum head to the limiting slot. The fixing bolt passes through the second fixing hole and engages with the threaded first fixing hole to fix the insertion head. The negative pressure from the external vacuum pump is transmitted through the connection slot to the top of the limiting slot, adsorbing the head of the hexagonal screw and pressing it firmly against the bottom of the limiting slot. The hexagonal inner cavity of the limiting slot provides circumferential limiting for the hexagonal screw. When the rotary motor drives the drive shaft to rotate, the drive shaft drives the insertion head to screw the hexagonal screw into the automotive part. This allows the insertion head to adapt to changes in the size of the hexagonal screw, improving the stability of screw insertion. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the buffer spring of this utility model.

[0023] Figure 3 This is a schematic diagram of the guide seat of this utility model.

[0024] Figure 4 This is a schematic diagram of the adsorption connecting rod of this utility model.

[0025] Figure 5 This is a schematic diagram of the connection end of this utility model.

[0026] Figure 6 This is a schematic diagram of the screw-in head of this utility model.

[0027] Figure 7This is a schematic diagram of the structure of the sealing gasket of this utility model.

[0028] Figure 8 This is a schematic diagram of the vacuum cavity structure of this utility model.

[0029] In the attached figures, the following labels are used:

[0030] 1. Support plate; 2. Drive seat; 3. Rotary motor; 4. Drive shaft; 5. Guide seat; 6. Movable cavity; 7. Movable rod; 8. Air slip ring; 9. Connecting seat; 10. Adsorption connecting rod; 11. Connecting end; 12. Mounting groove; 13. Guide slide groove; 14. Vacuum suction head; 15. Screw-in head; 16. Limiting groove; 17. Mounting slider; 18. Mounting slide groove; 19. First fixing hole; 20. Second fixing hole; 21. Fixing bolt; 22. Connecting slot; 23. Sealing gasket; 24. Fixing slot; 25. Connecting air valve; 26. Connecting air pipe; 27. Mounting hole; 28. Buffer spring; 29. ​​Buffer plate; 30. Sliding rod; 31. Limiting block; 32. Sliding guide groove; 33. Fixing pin; 34. Vacuum cavity; 35. Guide rod; 36. Limiting plate. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Reference Figures 1-8 In some specific embodiments, a screw positioning structure for a screw machine includes a support plate 1 connected to an external lifting device. A drive seat 2 is provided on one side of the support plate 1, a transmission shaft 4 is provided at the bottom of the drive seat 2, and a rotary motor 3 for driving the transmission shaft 4 is provided at the top of the drive seat 2. An adsorption connecting rod 10 is provided at the bottom of the transmission shaft 4. One end of the adsorption connecting rod 10 is provided with a screw-in head 15, and a limiting groove 16 is formed at the bottom of the screw-in head 15. A connecting end 11 is formed at one end of the adsorption connecting rod 10, and an installation groove 12 is formed at one end of the connecting end 11. The head 15 is inserted into the mounting groove 12. The top of the screw-in head 15 has a connecting slot 22 that connects to the limiting groove 16. The mounting groove 12 has a vacuum suction head 14 inside. The vacuum suction head 14 is connected to an external vacuum pump. The vacuum suction head 14 passes through the mounting groove 12, so that the vacuum suction head 14 is located inside the limiting groove 16. The outer edge of the screw-in head 15 has a first fixing hole 19. The outer edge of the connecting end 11 has a second fixing hole 20 that connects to the mounting groove 12. A fixing bolt 21 passes through the second fixing hole 20. The fixing bolt 21 is threaded into the first fixing hole 19.

[0035] Through the above technical solution, the insertion surfaces of the mounting groove 12 and the screw-in head 15 are designed as standardized interfaces, and there are multiple screw-in heads 15. The limiting groove 16 of each screw-in head 15 is adapted to a different type of hexagonal screw. When the type of hexagonal screw to be screwed in changes, the size of the hexagonal screw will also change along with the type of hexagonal screw. Therefore, the limiting groove 16 of the corresponding screw-in head 15 is selected, and the screw-in head 15 is made to fit into the mounting groove 12 of the adsorption connecting rod 10 by insertion. The vacuum suction head 14 is connected to the limiting groove 16 through the connecting slot 22. The fixing bolt 21 passes through the second... After fixing the hole 20, it engages with the first fixing hole 19 through a thread to fix the screw-in head 15. This allows the negative pressure drawn from the external vacuum pump by the vacuum suction head 14 to be transmitted through the connecting slot 22 to the top of the limiting groove 16, adsorbing the head of the hexagonal screw and pressing it tightly against the bottom of the limiting groove 16. The hexagonal inner cavity of the limiting groove 16 is responsible for circumferentially limiting the hexagonal screw. When the rotary motor 3 drives the transmission shaft 4 to rotate, the transmission shaft 4 drives the screw-in head 15 to screw the hexagonal screw into the automotive part. This makes it easier for the screw-in head 15 to adapt to the size changes of the hexagonal screw, improving the stability of screw-in.

[0036] Understandably, in order to increase the compatibility of the limiting groove 16 of the screw head 15 with bolts, the shape of the limiting groove 16 can be hexagonal, pentagonal, square, semi-circular, T-shaped, rectangular, etc., but cannot be circular. This is because a circular limiting groove 16 cannot form a limiting surface for a circular screw head, and therefore cannot drive the screw in.

[0037] Furthermore, since the screw-in head 15 is an independent module, if it wears out due to frequent use, only a single part needs to be replaced, thus avoiding the accuracy degradation problem caused by long-term wear of the traditional screw-in head 15.

[0038] Reference Figures 7-8 In some specific embodiments, the top of the screw-in head 15 is provided with a sealing gasket 23. The sealing gasket 23 is annular in shape and elastic. The sealing gasket 23 abuts against the top of the mounting groove 12, and the vacuum suction head 14 passes through the inner ring of the sealing gasket 23.

[0039] Through the above technical solution, the annular sealing gasket 23 is made of elastic material (such as silicone, fluororubber or polyurethane). Its inner ring diameter is slightly smaller than the outer diameter of the vacuum head 14, and the outer ring diameter matches the top end face of the screw-in head 15. When the screw-in head 15 is inserted into the mounting groove 12, the sealing gasket 23 is compressed by the top plane of the mounting groove 12. It fills the tiny gap between the screw-in head 15 and the mounting groove 12 by elastic deformation, forming a double seal in the radial and axial directions. This prevents gas from leaking from the second fixing hole 20 and affecting the adsorption effect of the hexagonal screw.

[0040] Reference Figures 7-8In some specific embodiments, the bottom of the sealing gasket 23 is provided with a fixing post 33, the fixing post 33 is elastic, and the top of the screw-in head 15 is provided with a fixing groove 24, the fixing post 33 is engaged with the fixing groove 24.

[0041] With the above technical solution, when the elasticity of the sealing gasket 23 decreases after long-term use, the sealing gasket 23 can be pulled out so that the pulling force of the fixing pin 33 is greater than the elastic force of the fixing groove 24, so that the fixing pin 33 can be pulled out to facilitate the replacement of the sealing gasket 23.

[0042] Reference Figures 5-8 In some specific embodiments, the mounting groove 12 has multiple mounting grooves 18 inside, and the outer edge of the screw-in head 15 has multiple mounting sliders 17, which slide in cooperation with the multiple mounting grooves 18 respectively.

[0043] With the above technical solution, the mounting grooves 18 are opened on the inner wall of the mounting groove 12, and the number is usually 2-4, which are evenly distributed along the circumference. When the screw-in head 15 is inserted into the mounting groove 12, the mounting slider 17 slides and engages with the mounting groove 18, thereby automatically correcting the angular deviation of the screw-in head 15 and forcing the screw-in head 15 to move along the preset path, thereby guiding the installation position of the screw-in head 15.

[0044] Furthermore, when the connecting end 11 drives the screw-in head 15 to rotate, the lateral limiting of the mounting slider 17 and the mounting groove 18 prevents the screw-in head 15 from deviating from its position and reduces the force on the fixing bolt 21.

[0045] Reference Figures 1-4 In some specific embodiments, a connecting seat 9 is provided on one side of the support plate 1, and an air slip ring 8 is provided inside the connecting seat 9. The adsorption connecting rod 10 passes through the inside of the air slip ring 8, so that the adsorption connecting rod 10 is rotatably connected to the rotor of the air slip ring 8. A vacuum cavity 34 is opened inside the adsorption connecting rod 10. The rotor of the air slip ring 8 is connected to a connecting air pipe 26. One end of the connecting air pipe 26 is connected to the vacuum cavity 34. A connecting air valve 25 is provided on one side of the connecting seat 9, which is connected to the inside of the stator of the air slip ring 8. The connecting air valve 25 is connected to an external vacuum pump.

[0046] Through the above technical solution, the air slip ring 8 (also known as a rotary joint) is a device for transferring gas between rotating parts. It consists of a stator and a rotor and allows 360° continuous rotation without twisting the pipeline (existing technology, so it will not be discussed in detail). When an external vacuum pump evacuates gas from the connecting gas valve 25, the gas is sequentially drawn out from the limiting groove 16 of the screw-in head 15, the vacuum suction head 14, the vacuum chamber, the connecting gas pipe 26, the rotor of the air slip ring 8, and the stator of the air slip ring 8, so that the hexagonal bolt can be attracted to the inside of the limiting groove 16.

[0047] Reference Figures 1-4 In some specific embodiments, a buffer plate 29 is provided on one side of the connecting seat 9, the buffer plate 29 is located above the connecting seat 9, a plurality of buffer springs 28 are provided on the top of the connecting seat 9, one end of the buffer spring 28 is connected to the bottom of the buffer plate 29, the other end of the adsorption connecting rod 10 is provided with a movable rod 7, the bottom of the transmission shaft 4 is provided with a guide seat 5, the bottom of the guide seat 5 is provided with a movable cavity 6, and the movable rod 7 is slidably engaged with the movable cavity 6.

[0048] With the above technical solution, when the external lifting device drives the support plate 1 to descend, the hexagonal screw loaded on the screw head 15 will have an instantaneous impact with the hole of the car part. At this time, the buffer spring 28 absorbs the peak impact force at the moment of impact, thereby protecting the hexagonal screw and the hole of the car part and preventing damage to the hexagonal screw or car part from a large impact force.

[0049] Furthermore, when the external lifting device drives the screw-in head 15 to descend, in order to ensure that the hexagonal screw has enough force to contact the hole of the car part, the movable rod 7 needs to be fully slid into the movable cavity 6 to form a stable axial support so that the rotary motor 3 can drive the screw-in head 15 to rotate. If the movable rod 7 is not fully slid in, the hexagonal screw will not have enough force to contact the hole of the car part, affecting the screw-in effect.

[0050] Reference Figures 1-4 In some specific embodiments, guide grooves 13 communicating with movable cavities 6 are provided on both sides of the guide seat 5, and mounting holes 27 are provided inside the movable rod 7. A guide rod 35 passes through the mounting holes 27, and both ends of the guide rod 35 extend into the adjacent guide grooves 13. The two ends of the guide rod 35 are respectively slidably engaged with the guide grooves 13 on both sides of the guide seat 5.

[0051] With the above technical solution, when the rotary motor 3 drives the guide seat 5 to rotate, the two ends of the guide rod 35 slide and engage with the guide grooves 13 on both sides of the guide seat 5, thereby limiting the lateral position of the guide rod 35. This ensures that the rotational driving force of the rotary motor can be transmitted to the screw head 15, and also guides the sliding of the guide rod 35 and the movable cavity 6, ensuring the normal use of the buffer spring 28.

[0052] Reference Figures 1-4 In some specific embodiments, limiting plates 36 are provided at both ends of the guide rod 35, so that the limiting plates 36 at both ends of the guide rod 35 are located on both sides of the guide seat 5, and the width of the limiting plates 36 is larger than the width of the guide groove 13.

[0053] With the above technical solution, when the two ends of the guide rod 35 are slidably engaged with the guide grooves 13 on both sides of the guide seat 5, the width of the limiting plate 36 is larger than the width of the guide groove 13, thereby preventing the two ends of the guide rod 35 from disengaging from the guide groove 13 and ensuring the stability of the guide rod 35 when sliding.

[0054] Reference Figures 1-4 In some specific embodiments, the top of the connecting seat 9 is provided with a plurality of sliding rods 30, which are respectively located inside a plurality of buffer springs 28. A plurality of sliding guide grooves 32 are opened inside the buffer plate 29. One end of the plurality of sliding rods 30 passes through the plurality of sliding guide grooves 32, and one end of the plurality of sliding rods 30 slides in cooperation with the plurality of sliding guide grooves 32.

[0055] With the above technical solution, when the impact force of the connecting seat 9 is transmitted to the buffer spring 28, the buffer spring 28 will extend or contract. At this time, one end of the multiple sliding rods 30 respectively slides and engages with the multiple sliding guide grooves 32, thereby limiting the lateral position of the buffer spring 28, preventing the buffer spring 28 from bending laterally, and ensuring the stability of the buffer spring 28 during operation.

[0056] Reference Figures 1-4 In some specific embodiments, a limiting block 31 is provided at one end of the sliding rod 30. The size of the limiting block 31 is larger than the size of the sliding guide groove 32, and the limiting block 31 is located above the buffer plate 29.

[0057] With the above technical solution, when the buffer spring 28 extends, the sliding rod 30 will slide downward. Since the size of the limiting block 31 is larger than the size of the sliding guide groove 32, the limiting block 31 is located above the buffer plate 29. At this time, the limiting block 31 will restrict the position of the sliding rod 30 and prevent the sliding rod 30 from leaving the sliding guide groove 32.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A screw positioning structure for a screw machine, comprising a support plate connected to an external lifting device, a drive seat on one side of the support plate, a transmission shaft at the bottom of the drive seat, a rotary motor for driving the transmission shaft to rotate at the top of the drive seat, an adsorption connecting rod at the bottom of the transmission shaft, a screw-in head at one end of the adsorption connecting rod, and a limit groove at the bottom of the screw-in head, characterized in that... One end of the adsorption connecting rod has a connecting end, and one end of the connecting end has a mounting groove. The screw-in head is inserted into the mounting groove. The top of the screw-in head has a connecting slot that communicates with the limiting groove. A vacuum suction head is provided inside the mounting groove. The vacuum suction head is connected to an external vacuum pump. The vacuum suction head passes through the mounting groove so that it is located inside the limiting groove. A first fixing hole is provided on the outer edge of the screw-in head. A second fixing hole that communicates with the mounting groove is provided on the outer edge of the connecting end. A fixing bolt passes through the second fixing hole and is threaded into the first fixing hole.

2. The screw positioning structure of a screw machine according to claim 1, characterized in that, The top of the screw-in head is provided with a sealing gasket. The sealing gasket is annular in shape and elastic. The sealing gasket abuts against the top of the mounting groove. The vacuum suction head passes through the inner ring of the sealing gasket.

3. The screw positioning structure of a screw machine according to claim 2, characterized in that, The bottom of the sealing gasket is provided with a fixing post, which is elastic, and the top of the screw-in head is provided with a fixing groove, which engages with the fixing post.

4. The screw positioning structure of a screw machine according to claim 1, characterized in that, The mounting groove has multiple mounting slots inside, and the outer edge of the screw-in head has multiple mounting sliders, which slide in cooperation with the multiple mounting slots respectively.

5. The screw positioning structure of a screw machine according to claim 1, characterized in that, A connecting seat is provided on one side of the support plate. An air slip ring is provided inside the connecting seat. The adsorption connecting rod passes through the air slip ring, so that the adsorption connecting rod is rotatably connected to the rotor of the air slip ring. A vacuum cavity is opened inside the adsorption connecting rod. The rotor of the air slip ring is connected to a connecting air pipe. One end of the connecting air pipe is connected to the vacuum cavity. A connecting air valve is provided on one side of the connecting seat, which is connected to the stator of the air slip ring and is connected to an external vacuum pump.

6. The screw positioning structure of a screw machine according to claim 5, characterized in that, A buffer plate is provided on one side of the connecting seat, and the buffer plate is located above the connecting seat. Multiple buffer springs are provided on the top of the connecting seat. One end of the buffer spring is connected to the bottom of the buffer plate. A movable rod is provided at the other end of the adsorption connecting rod. A guide seat is provided at the bottom of the transmission shaft. A movable cavity is opened at the bottom of the guide seat. The movable rod slides in conjunction with the movable cavity.

7. The screw positioning structure of a screw machine according to claim 6, characterized in that, The guide seat has guide grooves on both sides that connect to the movable cavity. The movable rod has a mounting hole inside, and a guide rod passes through the mounting hole. The two ends of the guide rod extend into the adjacent guide grooves, and the two ends of the guide rod slide in cooperation with the guide grooves on both sides of the guide seat.

8. The screw positioning structure of a screw machine according to claim 7, characterized in that, The guide rod has limiting plates at both ends, so that the limiting plates at both ends of the guide rod are located on both sides of the guide seat, and the width of the limiting plates is larger than the width of the guide groove.

9. The screw positioning structure of a screw machine according to claim 7, characterized in that, The top of the connecting seat is provided with multiple sliding rods, which are respectively located inside the multiple buffer springs. The buffer plate has multiple sliding guide grooves inside, and one end of each of the multiple sliding rods passes through the multiple sliding guide grooves and slides in cooperation with the multiple sliding guide grooves.

10. The screw positioning structure of a screw machine according to claim 9, characterized in that, One end of the sliding rod is provided with a limiting block, the size of which is larger than the size of the sliding guide groove, and the limiting block is located above the buffer plate.

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