Double-stroke axial driving assembly and screw locking and tightening device

Abstract

The double-stroke axial driving assembly comprises a shell, the shell comprises a cylinder barrel, a cylinder section, a first piston assembly and a second piston assembly, the cylinder barrel and the cylinder section are mutually nested and fixedly connected, the first piston assembly and the second piston assembly are mutually nested, the first piston assembly is slidably connected to the inner wall of the cylinder barrel, and the second piston assembly is slidably connected to the inner wall of the cylinder barrel. The second piston assembly is slidably connected to the inner wall of the cylinder section, and an inner cylinder barrel is arranged on the side, close to the first piston assembly, of the second piston assembly. And the limiting block is in threaded connection with the inner wall of the cylinder section, and the limiting block is arranged on the stroke path of the second piston assembly. The hydraulic cylinder is compact and reasonable in structure and convenient to operate, the two nested piston assemblies are adopted for driving, and the hydraulic cylinder has the design characteristics of being compact in structure, optimized in length, reduced in impact, controllable in speed and the like; and the problems in the prior art are effectively solved. The device not only improves the production efficiency and the product quality, but also saves the space and the cost.

Description

Technical Field

[0001] The invention relates to the technical field of tightening devices, in particular to a double-stroke axial drive component and a screw locking tightening device. Background Art

[0002] In the industrial production process, a large number of screws are needed on the workpiece, and the manual screwing method seriously affects the production efficiency.

[0003] In the prior art, screws are conveyed to an automatic screw-loading machine through a screw conveying mechanism, and then the automatic screw-loading machine is used to automatically tighten the screws, which greatly improves production efficiency.

[0004] CN113172409A discloses a double-stroke screw locking and tightening device, comprising an axial drive part, characterized in that the axial drive part comprises a cylinder, a first propulsion assembly, a second propulsion assembly, a stroke limit block and a third propulsion assembly; the stroke limit block is connected to the cylinder, a gas passage connecting the inside and outside of the cylinder is arranged on the stroke limit block, the first propulsion assembly and the second propulsion assembly are arranged axially on the same side of the stroke limit block, the third propulsion assembly is arranged on the other side of the stroke limit block, the first propulsion assembly, the second propulsion assembly and the third propulsion assembly are connected in sequence; the second propulsion assembly and the third propulsion assembly are arranged in a torque transmission rod. The beneficial effects of this invention are: while the axial movement of the cylinder piston rod is used to provide driving force, the torque transmission is realized through the space inside the cylinder piston rod, the screw locking and tightening device has a more compact structure, and adopts a modular design that is easy to process, manufacture and assemble; the screwing-in work adopts a two-stage stroke (double stroke) for detection when the rod sleeve absorbs the screw head.

[0005] However, the structure of this invention has problems such as long length, inconvenient adjustment of the stroke in the middle position, and inability to fine-tune the stroke starting point. Therefore, how to design an integrated screw locking and tightening device to solve the above problems is a technical problem that technicians in this field need to solve urgently.

[0006] For this purpose, we propose a double-stroke axial drive assembly and a screw locking and tightening device. Summary of the invention

[0007] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a dual-stroke axial drive assembly and a screw locking and tightening device, which effectively solves the problems existing in the existing technology by adopting two nested piston assemblies for driving and having the design features of compact structure, optimized length, reduced impact and controllable speed. The device not only improves production efficiency and product quality, but also saves space and cost.

[0008] The technical solution adopted by the present invention is as follows:

[0009] Double stroke axial drive assembly, comprising:

[0010] A housing, the housing comprising a cylinder barrel and a cylinder section which are nested and fixedly connected to each other;

[0011] The piston assembly 1 and the piston assembly 2 are nested with each other, the piston assembly 1 is slidably connected to the inner wall of the cylinder barrel, the piston assembly 2 is slidably connected to the inner wall of the cylinder section, and the inner cylinder barrel is arranged on the side of the piston assembly 2 close to the piston assembly 1;

[0012] as well as,

[0013] The limit block is threadedly connected to the inner wall of the cylinder section, and the limit block is arranged on the travel path of the second piston assembly.

[0014] The piston assembly 1 is composed of a piston head and a piston rod fixedly connected, the outer cylindrical surface of the piston head cooperates with the inner cylindrical surface of the cylinder barrel, and pneumatic sealing and guiding functions are achieved through a guide ring and a sealing ring.

[0015] The inner cylinder is arranged inside the second piston assembly. There is a definite air passage between the second piston assembly and the inner cylinder for transmitting compressed gas. The inner cylinder is provided with a damping hole for buffering effect.

[0016] A first cavity is arranged between the cylinder barrel, the cylinder section and the piston head. A first air port is opened on the cylinder section. The first cavity is communicated with the first air port, and the first air port is connected with compressed air.

[0017] A second cavity is provided between the cylinder section and the second piston assembly, a third cavity is provided between the second piston assembly and the inner cylinder, a fourth cavity is provided between the inner cylinder and the piston rod, and the second, third and fourth cavities are all connected to the second air port provided on the cylinder section, and the second air port is connected to compressed air.

[0018] A screw locking and tightening device, comprising the above-mentioned double-stroke axial drive assembly, further comprising:

[0019] A rotary transmission assembly is disposed in the housing and connected to the double-stroke axial drive assembly for transmitting a rotary torque;

[0020] A rotary drive fixing seat, which is connected to the other end of the cylinder section and is used to install the rotary drive device;

[0021] The gun head assembly is connected to the shell body and comprises a screw chuck. A "Y"-shaped channel consisting of two interconnected branch channels is arranged in the screw chuck for locking and conveying screws.

[0022] In one embodiment, the rotary transmission assembly includes a transmission shaft, a connecting shaft, an output shaft and an external spline shaft; the transmission shaft is open at both ends, one end of which has a spline or square feature capable of transmitting torque and is movably connected to the external spline shaft, and the other end of the external spline shaft extends into a rotary drive fixing seat and is connected to a rotary drive device.

[0023] In one of the embodiments, the other end of the transmission shaft is connected to the output shaft via a connecting shaft, and a screw chuck is connected to the output shaft.

[0024] In one of the embodiments, in one of the embodiments, a conical screw is provided in the rotary drive fixing seat for changing the effective cross-section of the air hole to adjust the flow rate of the air inlet and outlet holes.

[0025] The beneficial effects of the present invention are as follows:

[0026] The invention has a compact and reasonable structure and is easy to operate. It adopts two nested piston assemblies for driving, and has the design features of compact structure, optimized length, reduced impact, and controllable speed, which effectively solves the problems existing in the prior art. The device not only improves production efficiency and product quality, but also saves space and cost. At the same time, its modular design and adjustability make the device more flexible and versatile, and can meet the locking requirements of different workpieces and screws.

[0027] At the same time, the present invention also has the following advantages:

[0028] The present invention cleverly embeds the inner cylinder into the piston assembly 2 to form two parallel connected cavities and, that is, two parallel travel spaces. This design greatly reduces the overall length of the axial drive assembly, making the entire screw locking and tightening device more compact. In industrial production, miniaturization and compactness of equipment are important means to improve production efficiency and save space, and this embodiment just meets this demand.

[0029] In addition, the present invention adopts modular design and the components are closely connected, which not only saves space but also improves the stability and reliability of the equipment. This structural form enables the device to exert its maximum function in a limited space, which is of great significance for improving the overall efficiency of the production line.

[0030] A throttle hole is provided on one side of the inner cylinder of the present invention. This design can reduce the impact on the piston assembly 2 when the piston assembly is extended. During the screw locking process, the end mechanism driven by the cylinder will impact the assembly target material at a certain speed. If the impact force is too large, it may cause the assembly target material to be damaged or shifted. This embodiment effectively alleviates this impact through the design of the throttle hole, protecting the assembly target material from damage.

[0031] The rotary drive fixing seat of the present invention is provided with a conical screw, which can change the effective cross-section of the air hole. When the piston assembly 2 is extended, the back pressure is formed in the cavity by reducing the intake flow, thereby reducing the speed of the piston assembly 2. This design makes the speed of the screw more stable and controllable during the tightening process, and improves the tightening accuracy and stability.

[0032] At the same time, when the piston assembly 2 retracts, the conical screw can also reduce the exhaust flow to form back pressure, relieving the impact of the piston assembly 2 on the limit block. This design not only protects the limit block from damage, but also improves the problem of loosening of the limit block thread and reduces noise. This speed-controllable design makes the equipment more stable and reliable during operation, improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional structural schematic diagram of the present invention.

[0034] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure.

[0035] Figure 3 for Figure 1 Enlarged schematic diagram of the local structure.

[0036] in:

[0037] 1. Double-stroke axial drive assembly; 2. Rotary transmission assembly; 3. Gun head assembly;

[0038] 101, cylinder barrel; 102, cylinder section; 103, piston assembly 1; 104, piston assembly 2; 105, inner cylinder barrel; 106, stop block; 107, rotation drive fixing seat; 108, piston head; 109, piston rod; 110, conical screw; 201, bearing; 202, transmission shaft; 203, connecting shaft; 204, output shaft; 205, external spline shaft;

[0039] a, first cavity; b1, second cavity; b2, third cavity; b3, fourth cavity; c, fifth cavity; Q1, first air port; Q2, second air port; Q3, third air port. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0041] In order to achieve the above purpose and the above technical effect, the present invention adopts the following technical solution:

[0042] Embodiment 1:

[0043] like Figure 2 and Figure 3As shown, a double-stroke axial drive assembly is disclosed in this embodiment, and its structure includes a housing, a piston assembly 103, a piston assembly 2 104, an inner cylinder 105 and a stop block 106. This combined design enables the double-stroke axial drive assembly to work more stably and efficiently, and provides strong power support for screw locking. The double-stroke axial drive assembly is the core part of the entire device, and the rationality and stability of its design directly affect the effect of screw locking. Through the cooperation of the piston assembly 103 and the piston assembly 2 104, the screw can be locked quickly and accurately. At the same time, the design of the inner cylinder 105 and the stop block 106 also further improves the stability and reliability of the double-stroke axial drive assembly, ensuring the long-term stable operation of the entire device.

[0044] The housing in this embodiment includes a cylinder barrel 101 and a cylinder section 102 which are nested and fixedly connected to each other.

[0045] Specifically, the piston assembly 103 is composed of a piston head 108 and a piston rod 109 that are fixedly connected. The outer cylindrical surface of one end of the piston assembly 103, that is, the outer cylindrical surface of the piston head 108, cooperates with the inner cylindrical surface of the cylinder 101, and the pneumatic sealing and guiding functions are realized through the guide ring and the sealing ring. At the same time, the sealing ring and the guide ring also have the function of dust removal. This design not only ensures the stable movement of the piston assembly 103 in the cylinder 101, but also effectively prevents dust and impurities from entering the interior of the device, thereby improving the cleanliness and service life of the device.

[0046] At the same time, in this embodiment, one side of the cylinder section 102 has a smooth inner cylindrical surface, which cooperates with the outer cylindrical surface of one end of the piston assembly 104, and realizes pneumatic sealing and guiding through the guide ring and the sealing ring. This design makes the movement of the piston assembly 104 in the cylinder section 102 more stable and smooth, providing more reliable power support for screw locking. The design of the cylinder section 102 fully considers the matching relationship with the piston assembly 104, and realizes the dual role of pneumatic sealing and guiding through the smooth inner cylindrical surface and the guide ring and the sealing ring. This design not only improves the sealing performance and guiding accuracy of the device, but also makes the movement of the piston assembly 104 in the cylinder section 102 more stable and smooth, providing more reliable power support for screw locking.

[0047] like Figure 2As shown, in this embodiment, the piston assembly 104 is provided with an inner cylinder 105 inside, and a certain air passage is provided between the piston assembly 104 and the inner cylinder 105 for transmitting compressed gas to drive the piston assembly 103. At the same time, the inner cylinder 105 is provided with a damping hole for buffering, which can reduce the impact and prevent the end mechanism driven by the cylinder from impacting the assembly target material. This design not only improves the operating efficiency of the device, but also effectively protects the assembly target material from impact damage. The design of the piston assembly 104 and the inner cylinder 105 fully considers the transmission and buffering effect of the gas. By transmitting compressed gas through a certain air passage, the piston assembly 103 can be driven efficiently. At the same time, the damping hole provided on the inner cylinder 105 can effectively reduce the impact and prevent the end mechanism driven by the cylinder from causing impact damage to the assembly target material. This design not only improves the operating efficiency and stability of the device, but also effectively protects the safety and integrity of the assembly target material.

[0048] The outer thread of the limit block 106 in this embodiment is threadedly connected to the inner thread of one end of the cylinder section 102, and the limit block 106 is also arranged on the travel path of the piston assembly 104. Through the adjustment of the thread, the movement range of the piston assembly 104 can be limited, and the adjustment of the limit position can be achieved. This design makes the device more flexible and adjustable, and adapts to the limit requirements under different locking requirements. The design of the limit block 106 fully considers the flexibility and adjustability of the device. Through the threaded connection, the position of the limit block 106 can be easily adjusted to limit the movement range of the piston assembly 104. This design not only improves the flexibility and adaptability of the device, but also enables the device to more accurately meet the limit requirements under different locking requirements. At the same time, the threaded connection method is also convenient for replacing and maintaining the limit block 106, reducing the cost of use.

[0049] like Figure 3 As shown, in this embodiment, a first cavity a is provided between the cylinder barrel 101, the cylinder section 102 and the piston head 108, and two air ports are provided on the cylinder section 102, namely the first air port Q1 and the second air port Q2, wherein the first cavity a is connected to the first air port Q1, and the first air port Q1 is connected to compressed air. This design enables compressed air to enter the first cavity a through the first air port Q1, providing power support for the piston assembly 103, and the design of the first cavity a and the first air port Q1 fully considers the transmission and utilization of compressed air. By connecting compressed air through the first air port Q1, compressed air can smoothly enter the first cavity a, providing powerful power support for the piston assembly 103. This design not only improves the operating efficiency and stability of the device, but also enables the device to more efficiently utilize compressed air resources and reduce energy consumption.

[0050] like Figure 3As shown, in this embodiment, a second cavity b1 is provided between the cylinder section 102 and the second piston assembly 104, a third cavity b2 is provided between the second piston assembly 104 and the inner cylinder 105, and a fourth cavity b3 is provided between the inner cylinder 105 and the piston rod 109. b1, b2, and b3 are connected to the second air port Q2, and the second air port Q2 is connected to compressed air. This multi-level cavity design not only optimizes the flow path of the gas, but also improves the pneumatic efficiency and stability of the device. The design of the second cavity b1, the third cavity b2, and the fourth cavity b3 fully considers the flow and transmission of the gas. Through the multi-level cavity design, the flow path of the gas can be optimized and the pneumatic efficiency and stability of the device can be improved. At the same time, this design also enables the device to use compressed air resources more efficiently and reduce energy consumption. In addition, the connection between the second air port Q2 and the compressed air also provides continuous and stable power support for the device.

[0051] Embodiment 2:

[0052] like Figure 1-Figure 3 As shown, this embodiment discloses a screw locking and tightening device, whose structure includes the double-stroke axial drive assembly 1 in embodiment 1, and also includes a rotary transmission assembly 2, a gun head assembly 3 and other structures.

[0053] like Figure 1 As shown, the gun head assembly 3 in this embodiment includes a screw chuck, and a "Y"-shaped channel composed of two interconnected branch channels is arranged in the screw chuck. The "Y"-shaped channel includes a linear locking channel for locking the locking tool and an oblique nail feeding channel for conveying the screws. This design enables the screws to smoothly enter the linear locking channel through the oblique nail feeding channel, thereby realizing fast and accurate loading and locking of the screws.

[0054] like Figure 1-Figure 3 As shown, the shell in this embodiment is connected to the gun head assembly 3, and the shell also includes a rotating drive fixing seat 107 connected to the other end of the cylinder section 102. The cross-section between the rotating drive fixing seat 107 and the cylinder section 102 is adjusted by a conical screw 110 to achieve flow adjustment of the inlet and outlet holes, thereby achieving the effect of controlling the speed of the piston assembly 104. This structural design makes the entire device more compact, and through the adjustment of the conical screw 110, the movement speed of the piston assembly 104 can be flexibly controlled to adapt to different locking requirements.

[0055] like Figure 3As shown, in this embodiment, a fifth cavity c is provided between the piston rod 109, the piston assembly 104, the inner cylinder 105, the stopper 106 and the rotation drive fixed seat 107, and the fifth cavity c and the third gas port Q3 are connected to the atmosphere, and the third gas port Q3 is provided on the rotation drive fixed seat 107. This design enables the gas in the fifth cavity c to be connected to the atmosphere through the third gas port Q3, thereby achieving smooth discharge of gas and stable operation of the device. The design of the fifth cavity c and the third gas port Q3 fully considers the discharge of gas and the stability of the device. By connecting to the atmosphere through the third gas port Q3, the gas in the fifth cavity c can be smoothly discharged into the atmosphere, thereby avoiding the accumulation of gas and the increase of pressure. This design not only improves the stability and safety of the device, but also enables the device to operate more efficiently and prolongs its service life.

[0056] like Figure 2 As shown, the rotary transmission assembly 2 in this embodiment includes a transmission shaft 202, a connecting shaft 203, an output shaft 204 and an external spline shaft 205, wherein specifically, the transmission shaft 202 is fixed in the inner holes of the piston assembly 1 103 and the piston assembly 2 104 respectively through bearings 201, retaining springs and other parts. This design enables the transmission shaft 202 to be stably fixed in the inner holes of the piston assembly 1 103 and the piston assembly 2 104, providing reliable support for the rotary transmission. The design of the rotary transmission assembly 2 fully considers the stability and reliability of the transmission shaft 202. The transmission shaft 202 is fixed in the inner holes of the piston assembly 1 103 and the piston assembly 2 104 through bearings 201, retaining springs and other parts, so that the transmission shaft 202 can remain stable during the rotary transmission process, avoiding transmission failure caused by looseness or shaking. This design not only improves the stability and reliability of the rotary transmission assembly 2, but also enables the entire device to operate more efficiently.

[0057] The transmission shaft 202 in this embodiment is open at both ends and has features such as splines or squares that can transmit torque inside one end, and the end of the transmission shaft 202 is movably plugged with the external spline shaft 205. This plug-in design facilitates the rapid connection and separation between the transmission shaft 202 and the external spline shaft 205, and improves the flexibility of assembly. At the same time, the other end of the external spline shaft 205 extends into the rotation drive fixing seat 107 and connects to the rotation drive device. This design ensures that the power of the rotation drive device can be stably and efficiently transmitted to the transmission shaft 202. This design ensures the accuracy and reliability of torque transmission through the close fit of the splines or squares, and avoids power loss or transmission failure caused by loose connection.

[0058] At the same time, the other end of the transmission shaft 202 is connected to the output shaft 204 through the connecting shaft 203. This multi-stage connection structure makes the transmission system more flexible and can adapt to different work scenarios and needs. The output shaft 204 is connected with a screw chuck. The design of the screw chuck enables the device to easily clamp screws of different specifications, thereby improving the versatility of the device. The screw chuck usually has an adjustable clamping force, which can ensure that the screw will not slip off during the tightening process, thereby ensuring the stability and safety of the work. In addition, the replaceability of the screw chuck also enables the device to adapt to more types of screws, further expanding its scope of application.

[0059] This embodiment has the following beneficial effects:

[0060] The inner cylinder 105 is embedded in the piston assembly 104 of the double-stroke axial drive assembly 1, forming two parallel connected cavities b1 and b2, that is, forming two parallel stroke spaces. This design not only saves space, but also achieves the effect of reducing the length of the double-stroke axial drive assembly 1. Through the parallel design, the two stroke spaces can share a part of the structure, thereby reducing the overall length. This design provides a larger stroke in a limited space, improving the compactness and working efficiency of the equipment.

[0061] In addition, the two parallel connected cavities b1 and b2 can also realize different functions or working modes. For example, a gas pressure or hydraulic source for pushing the piston assembly 2 104 to extend can be set in one cavity, while the other cavity can be used for exhaust or drainage when the piston assembly 2 104 is retracted. This design makes the operation of the double-stroke axial drive assembly 1 more flexible and diverse, and can adapt to different work requirements and scenarios. At the same time, since the two cavities are connected, pressure balance and stability can also be achieved, which improves the reliability and stability of the equipment.

[0062] A throttle hole is provided on one side of the inner cylinder 105, which can reduce the impact on the piston assembly 2 104 when the piston assembly 1 103 is extended. The throttle hole limits the flow of the fluid, so that the piston assembly 1 103 can move slowly and smoothly during the extension process, avoiding vibration and noise caused by sudden impact of the fluid. The end mechanism driven by the cylinder is relieved from impacting the assembly target material in the gun head, thereby protecting the assembly target material from damage and improving the assembly quality and efficiency.

[0063] A conical screw is provided in the rotation drive fixing seat, which can change the effective cross-section of the air hole. This is a very practical design. The conical screw can change the effective cross-section size of the air hole during the rotation process through its special conical shape, thereby realizing precise control of the air flow rate. When the piston assembly 104 is extended, the intake flow rate is reduced and back pressure is formed in the cavity c, so as to achieve the effect of reducing the speed of the piston assembly 104. The generation of back pressure can make the piston assembly 104 more stable during the extension process, avoiding the impact and vibration caused by excessive speed. Thereby alleviating the force of the end mechanism driven by the cylinder to impact and tighten the workpiece, protecting the workpiece from damage.

[0064] The conical screw can also play a role when the piston assembly 104 is retracted. By reducing the exhaust flow and forming a back pressure in the cavity c, the speed of the piston assembly 104 can be reduced, thereby alleviating the impact of the piston assembly 104 on the limit block. The limit block is an important component used to limit the movement position of the piston assembly 104. If the impact is too large, it may cause the limit block to be damaged or loose. Improve the problem of loosening of the limit block thread and reduce noise. By reducing the impact, the limit block can be more firmly fixed on the equipment, avoiding failures and safety hazards caused by looseness. At the same time, reducing noise can also improve the working environment of the equipment and the comfort of the user. This design not only improves the reliability and stability of the equipment, but also extends the service life of the equipment.

[0065] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. Double-stroke axial drive assembly, characterized in that: include: A housing, the housing comprising a cylinder barrel and a cylinder section which are nested and fixedly connected to each other; The piston assembly 1 and the piston assembly 2 are nested with each other, the piston assembly 1 is slidably connected to the inner wall of the cylinder barrel, the piston assembly 2 is slidably connected to the inner wall of the cylinder section, and the inner cylinder barrel is arranged on the side of the piston assembly 2 close to the piston assembly 1; as well as, The limit block is threadedly connected to the inner wall of the cylinder section, and the limit block is arranged on the travel path of the second piston assembly.

2. The dual-stroke axial drive assembly according to claim 1, characterized in that: The piston assembly 1 is composed of a piston head and a piston rod fixedly connected, the outer cylindrical surface of the piston head cooperates with the inner cylindrical surface of the cylinder barrel, and pneumatic sealing and guiding functions are achieved through a guide ring and a sealing ring.

3. The dual-stroke axial drive assembly according to claim 2, characterized in that: The inner cylinder is arranged inside the second piston assembly. There is a definite air passage between the second piston assembly and the inner cylinder for transmitting compressed gas. The inner cylinder is provided with a damping hole for buffering effect.

4. The dual-stroke axial drive assembly according to claim 3, characterized in that: A first cavity is arranged between the cylinder barrel, the cylinder section and the piston head. A first air port is opened on the cylinder section. The first cavity is communicated with the first air port, and the first air port is connected with compressed air.

5. The dual-stroke axial drive assembly according to claim 4, characterized in that: A second cavity is provided between the cylinder section and the second piston assembly, a third cavity is provided between the second piston assembly and the inner cylinder, a fourth cavity is provided between the inner cylinder and the piston rod, and the second, third and fourth cavities are all connected to the second air port provided on the cylinder section, and the second air port is connected to compressed air.

6. A screw locking and tightening device, characterized in that: It comprises the dual-stroke axial drive assembly according to any one of claims 1 to 5, and further comprises: A rotary transmission assembly is disposed in the housing and connected to the double-stroke axial drive assembly for transmitting a rotary torque; A rotary drive fixing seat, which is connected to the other end of the cylinder section and is used to install the rotary drive device; The gun head assembly is connected to the shell and includes a screw chuck. A "Y"-shaped channel consisting of two interconnected branch channels is arranged in the screw chuck for locking and conveying screws.

7. A screw locking and tightening device according to claim 6, characterized in that: The rotary transmission assembly includes a transmission shaft, a connecting shaft, an output shaft and an external spline shaft; the transmission shaft is open at both ends, one end of which has a spline or square feature that can transmit torque and is movably connected to the external spline shaft, and the other end of the external spline shaft extends into a rotary drive fixing seat and is connected to a rotary drive device.

8. A screw locking and tightening device according to claim 7, characterized in that: The other end of the transmission shaft is connected to the output shaft through a connecting shaft, and a screw chuck is connected to the output shaft.

9. The screw locking and tightening device according to claim 6, characterized in that: A fifth cavity is arranged between the piston rod, the second piston assembly, the inner cylinder, the limit block and the rotation drive fixing seat, and the fifth cavity and the third air port arranged on the rotation drive fixing seat are communicated with the atmosphere.

10. The screw locking and tightening device according to claim 6, characterized in that: The rotary drive fixing seat is provided with a conical screw for changing the effective cross section of the air hole to adjust the flow rate of the air inlet and outlet holes.

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