Handheld tightening module

Abstract

The handheld tightening module comprises a screw feeding assembly and a tightening assembly, the tightening assembly comprises a cylinder body, one end of the cylinder body is connected with the screw feeding assembly through a gun head, the gun head is used for receiving screws conveyed by the screw feeding assembly, and the cylinder body internally comprises a first containing cavity and a second containing cavity which are independent of each other; one end of the spline housing is connected with a first piston, the other end of the spline housing is connected with a second piston, the first piston is arranged in the first containing cavity to form a low-pressure cavity, the second piston is arranged in the second containing cavity to form a high-pressure cavity, and the high-pressure cavity is communicated with the low-pressure cavity and / or the high-pressure cavity by introducing air into the low-pressure cavity and / or the high-pressure cavity. And the first piston and the second piston are driven to move in the first containing cavity and the second containing cavity respectively so as to drive the spline housing to move in the cylinder body. Dependence of a traditional tightening tool on the vacuum environment is broken through, stable operation can be achieved under the vacuum-free working condition, and the application range of the tightening tool is greatly expanded.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disassembling and assembling tools, in particular to a hand-held tightening module. BACKGROUND

[0002] In the field of tightening industry, a hand-held tightening gun is an important tool widely used in various assembly production lines and maintenance operations. At present, the mainstream hand-held tightening gun on the market adopts an internal cylinder tightening module. This module uses compressed air as the medium and relies on the power of the cylinder to realize linear motion. At the same time, it is connected to the tightening tool through a chuck or a sleeve, thereby realizing the rotary motion of tightening.

[0003] In actual application, there are some specific occasions where customers explicitly stipulate that vacuum cannot be used based on production environment, product characteristics or process requirements and other factors. However, the existing internal cylinder tightening module cannot work normally in these occasions where vacuum cannot be used because its working principle relies on vacuum adsorption of screws. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiment of the present application is to provide a hand-held tightening module, which comprises a screw feeding assembly and a tightening assembly, wherein the tightening assembly comprises:

[0005] a cylinder body, one end of which is connected to the screw feeding assembly through a gun head, the gun head being used to receive screws delivered by the screw feeding assembly, the cylinder body comprising a first cavity and a second cavity which are independent of each other;

[0006] a spline sleeve, one end of which is connected to a first piston and the other end of which is connected to a second piston, the first piston being arranged in the first cavity to form a low-pressure cavity, and the second piston being arranged in the second cavity to form a high-pressure cavity, air being supplied to the low-pressure cavity and / or the high-pressure cavity to move the first piston and the second piston in the first cavity and the second cavity respectively, thereby moving the spline sleeve in the cylinder body;

[0007] a spline shaft, which is arranged in the spline sleeve and can drive the spline sleeve to rotate around the axis of the spline shaft, the spline shaft comprising a large-diameter end and a small-diameter end, a spring retainer and a spring being arranged on the small-diameter end, the spring retainer being close to the large-diameter end, and one end of the spring being pressed against the spring retainer;

[0008] a chuck, which is connected to one end of the spline sleeve located in the second cavity and is in contact with the screw, the chuck driving the screw to rotate when the spline sleeve drives it to rotate;

[0009] When the low-pressure cavity is ventilated and the high-pressure cavity is not ventilated, the first piston drives the spline sleeve to move into the first cavity, and the spline sleeve drives the batch head to move to a first position, so that the nail feeding assembly can feed the nail;

[0010] When the low-pressure cavity and the high-pressure cavity are both ventilated, the second piston drives the spline sleeve to move into the second cavity, and the spline sleeve drives the batch head to move from the first position to a second position, and the batch head blocks the screw from moving into the gun head, so that the screw is positioned with the hole to be installed.

[0011] When the low-pressure cavity is not ventilated and the high-pressure cavity is ventilated, the second piston continues to drive the spline sleeve to move into the second cavity, and the spline sleeve drives the batch head to move from the second position to a third position, so that the screw tightening assembly completes the screwing of the screw.

[0012] As an optional embodiment, the nail feeding assembly comprises a gas blowing channel, and the gas blown through the gas blowing channel feeds the screw into the gun head and makes the tail of the screw protrude out of the gun head.

[0013] As an optional embodiment, the first piston and the second piston are both ring body structures, the inner circumferential wall of the first piston and the inner circumferential wall of the second piston are respectively connected with the outer circumferential wall of the spline sleeve, the outer circumferential wall of the first piston is connected with the cavity wall of the first cavity, and the outer circumferential wall of the second piston is connected with the cavity wall of the second cavity.

[0014] As an optional embodiment, the small-diameter end comprises a connecting portion connected with the large-diameter end and a mounting portion connected with the connecting portion, the diameter of the connecting portion is smaller than the diameter of the mounting portion, a first step structure is formed at the connection between the connecting portion and the mounting portion, and an annular clamping groove is formed on the step surface of the first step structure.

[0015] The connection between the connecting portion and the mounting portion is sleeved with the spring retaining sleeve, the inner wall of the spring retaining sleeve is formed with a second step structure matched with the first step structure, and a clamping ring matched with the clamping groove is arranged on the step surface of the second step structure.

[0016] As an optional embodiment, the outer periphery of one end of the mounting portion away from the connecting portion is protruded outward to form a limiting portion, the spring is sleeved on the mounting portion, and the two ends of the spring are respectively abutted with the spring retaining sleeve and the limiting portion.

[0017] As an optional embodiment, the spline sleeve comprises a sleeve body and a plurality of first splines arranged on the inner wall of the sleeve body, a first spline groove is formed between adjacent two first splines,

[0018] The large-diameter end comprises a shaft body and a plurality of second splines arranged on the outer wall of the shaft body, and a second spline groove is formed between adjacent two second splines, the first spline is matched with the second spline groove, and the second spline is matched with the first spline groove.

[0019] As an optional embodiment, the diameter of the shaft body is greater than the diameter of the mounting portion and less than the outer diameter of the spring, and the diameter of a circle surrounded by the plurality of first splines near one end of the shaft body is greater than the diameter of the mounting portion and less than the outer diameter of the spring, so that one end of the spring can be switched from pressing on the spring retainer sleeve to pressing on the first spline when the spline sleeve moves in the cylinder body.

[0020] As an optional embodiment, the cylinder body is divided into a first cavity and a second cavity which are independent of each other by a mounting seat, one end of the first cavity and the second cavity near the mounting seat is a first end of each cavity respectively, and one end of the first cavity and the second cavity away from the mounting seat is a second end of each cavity respectively, the low-pressure cavity is formed between the first piston and the first end of the first cavity, and the high-pressure cavity is formed between the second piston and the first end of the second cavity.

[0021] As an optional embodiment, the mounting seat is a ring body structure, the spline sleeve penetrates through the mounting seat, and the outer peripheral wall of the spline sleeve is in sliding connection with the inner peripheral wall of the mounting seat.

[0022] As an optional embodiment, the cylinder body is provided with two air holes which are communicated with the low-pressure cavity or the high-pressure cavity respectively, and the air holes are used for air intake or exhaust.

[0023] The beneficial effects of the embodiments of the application are as follows:

[0024] The application breaks through the dependence of traditional tightening tools on vacuum environment, can stably operate under non-vacuum working condition, and greatly expands the application range.

[0025] The tightening module of the application has a multi-position parking function, through the regulation of the compressed air pressure in the high-pressure cavity and the low-pressure cavity and the ingenious use of the spring elasticity, the bit can be parked at multiple specific positions, which provides high operation flexibility for complex tightening operation.

[0026] Moreover, the multi-position parking function of the module can ensure that each component can accurately reach the predetermined position during different tightening stages, such as nail feeding, positioning, and screwing, thereby improving the precision and consistency of screw tightening. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the whole machine of the tightening module of the embodiments of the application.

[0028] Figure 2 Structure diagram of the screwing module when the batch head is in the first position according to an embodiment of the present application;

[0029] Figure 3 Structure diagram of the screwing module when the batch head is in the second position according to an embodiment of the present application;

[0030] Figure 4 Structure diagram of the screwing module when the batch head is in the third position according to an embodiment of the present application;

[0031] Figure 5 Sectional view of the spline sleeve and spline shaft connection according to an embodiment of the present application;

[0032] Figure 6 Exploded view of the spline sleeve and spline shaft according to an embodiment of the present application Figure 1 ;

[0033] Figure 7 Exploded view of the spline sleeve and spline shaft according to an embodiment of the present application Figure 2 ;

[0034] Figure 8 Structure diagram of the small-diameter end of the spline shaft according to an embodiment of the present application.

[0035] wherein,

[0036] 1, nail feeding assembly; 21, cylinder body; 22, gun head; 23, first cavity; 24, second cavity; 25, mounting seat; 3, spline sleeve; 31, sleeve body; 32, first spline; 33, first spline groove; 41, first piston; 42, second piston; 43, low-pressure cavity; 44, high-pressure cavity; 5, spline shaft; 51, large-diameter end; 511, shaft body; 512, second spline; 513, second spline groove; 52, small-diameter end; 521, connecting part; 522, clamping groove; 523, mounting part; 524, limiting part; 6, spring retainer; 7, spring; 8, batch head. DETAILED DESCRIPTION

[0037] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0038] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be construed as limiting, but merely as exemplification of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0039] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0040] These and other characteristics of the present application will become patently apparent as the description proceeds in conjunction with the accompanying drawings, by way of non-limiting examples.

[0041] It should also be understood that, while the present application has been described above with reference to particular embodiments, many alternatives, modifications, and equivalents will be apparent to those of ordinary skill in the art.

[0042] The above and other aspects, features, and advantages of the present application will become apparent from the following detailed description, by way of non-limiting examples, when considered in conjunction with the accompanying drawings.

[0043] Particular embodiments of the present application are described hereinafter, by way of non-limiting examples; however, it is to be understood that the application is not limited to the particular embodiments, as many apparent alternatives, modifications, and equivalents will be apparent to those of ordinary skill in the art. The known and / or repeated functions and structures are not described in detail in order to avoid obscuring the present application in unnecessary or redundant details. Therefore, specific structural and functional details disclosed herein are not to be interpreted in a manner that would limit the application as defined in the claims.

[0044] The specification can use phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more of the same or different embodiments of the application.

[0045] A hand-held screwing module of an embodiment of the present application, as shown in Figures 1-4 includes a nail feeding assembly 1 and a screwing assembly, which includes a cylinder 21, a spline sleeve 3, a spline shaft 5, and a bit 8.

[0046] One end of the cylinder 21 is connected with the nail feeding assembly 1 through a gun head 22, which is used to receive the screws delivered by the nail feeding assembly 1. The cylinder 21 includes a first cavity 23 and a second cavity 24, which are independent of each other.

[0047] One end of the spline sleeve 3 is connected with a first piston 41, and the other end is connected with a second piston 42. The first piston 41 is arranged in the first cavity 23 to form a low-pressure cavity 43, and the second piston 42 is arranged in the second cavity 24 to form a high-pressure cavity 44. By supplying air to the low-pressure cavity 43 and / or the high-pressure cavity 44, the first piston 41 and the second piston 42 are moved in the first cavity 23 and the second cavity 24, respectively, to drive the spline sleeve 3 to move in the cylinder 21.

[0048] The spline shaft 5 is arranged in the spline sleeve 3, the spline shaft 5 comprises a large-diameter end 51 and a small-diameter end 52, the spring retainer 6 and the spring 7 are arranged on the small-diameter end 52, the spring retainer 6 is close to the large-diameter end 51, and one end of the spring 7 is pressed against the spring retainer 6. The large-diameter end 51 of the spline shaft 5 is connected with the power source, the spline shaft 5 rotates around the axis thereof under the driving of the power source, and drives the spline sleeve 3 to rotate around the axis of the spline shaft 5. The spring 7 is in a compressed state in an initial state.

[0049] The chuck 8 is connected with one end of the spline sleeve 3 in the second cavity 24 and is in contact with the screw, and the chuck 8 drives the screw to rotate when the spline sleeve 3 drives the chuck 8 to rotate.

[0050] When the low-pressure cavity 43 is ventilated and the high-pressure cavity 44 is not ventilated, the first piston 41 drives the spline sleeve 3 to move into the first cavity 23, and the spline sleeve 3 drives the chuck 8 to move to a first position when the spline sleeve 3 moves, so that the screw feeding assembly 1 can feed the screw.

[0051] When the low-pressure cavity 43 and the high-pressure cavity 44 are both ventilated, the second piston 42 drives the spline sleeve 3 to move into the second cavity 24, and the spline sleeve 3 drives the chuck 8 to move from the first position to a second position when the spline sleeve 3 moves, and the chuck 8 hinders the screw from moving into the gun head 22, so that the screw is positioned with the hole to be installed. At this time, the pressure difference between the high-pressure cavity 44 and the low-pressure cavity 43 generates a public force equal to the elastic force of the spring 7, when the spline sleeve 3 contacts the spring 7, the elastic force of the spring 7 is switched from being borne by the spring retainer 6 to being borne by the spline sleeve 3, and the spring retainer 6 does not bear the elastic force of the spring 7. At this time, the force balance is achieved, that is, the parking at the second position is achieved.

[0052] When the low-pressure cavity 43 is not ventilated and the high-pressure cavity 44 is ventilated, the second piston 42 continues to drive the spline sleeve 3 to move into the second cavity 24, and the spline sleeve 3 drives the chuck 8 to move from the second position to a third position when the spline sleeve 3 moves, so that the screw tightening assembly completes the screwing of the screw. During this process, the pressure generated by the gas in the high-pressure cavity 44 is greater than the elastic force of the spring 7.

[0053] In actual application, the gun head 22 is arranged downward and the cylinder body 21 is arranged above the gun head 22. In different ventilation states (combination of the low-pressure cavity 43 and the high-pressure cavity 44 being ventilated or not), the chuck 8 moves to different positions under the driving of the spline sleeve 3, thereby realizing different functions such as screw feeding, screw positioning and screwing.

[0054] Specifically, as Figure 2As shown, when the low-pressure cavity 43 is ventilated and the high-pressure cavity 44 is not ventilated, the gas in the low-pressure cavity 43 increases, forcing the first piston 41 to move the spline sleeve 3 into the first cavity 23 under the action of air pressure, and the spline sleeve 3 in turn drives the chuck 8 to move to the first position, at which time the chuck 8 does not hinder the gun head 22, and the screw feeding assembly 1 can smoothly feed the screw to the position of the gun head 22, preparing for subsequent tightening.

[0055] Next, as shown in FIG. 4, when the low-pressure cavity 43 and the high-pressure cavity 44 are both ventilated, the second piston 42 drives the spline sleeve 3 to move into the second cavity 24, and the chuck 8 moves from the first position to the second position, and the chuck 8 moves to a position in contact with the head of the screw, at which time the chuck 8 hinders the movement of the screw into the gun head 22. If the screw is aligned with the hole to be installed, the operation continues (i.e., the chuck 8 will move from the second position to the third position). If the screw is not aligned with the hole to be installed, the entire tightening module is moved so that the screw can be accurately positioned in alignment with the hole to be installed, ensuring that there will be no deviation during subsequent tightening. Figure 3 Finally, as shown in FIG. 5, when the low-pressure cavity 43 is not ventilated and the high-pressure cavity 44 is ventilated, the second piston 42 continues to drive the spline sleeve 3 to move into the second cavity 24, and the chuck 8 moves from the second position to the third position, during which the tightening assembly begins to rotate and complete the screwing of the screw, firmly installing the screw onto the product.

[0056] Figure 4 The present application eliminates the dependence on vacuum and is suitable for work sites where the use of vacuum is prohibited, thereby widening the application range of the tightening module. At the same time, through the movement of the two pistons in different cavities and the cooperation with various components, the operations of feeding, positioning, and screwing are achieved in multiple steps, improving the accuracy of tightening and the efficiency of assembly and reducing the error of manual operation.

[0057] In an embodiment, the screw feeding assembly 1 includes a gas blowing channel through which gas is blown to feed the screw into the gun head 22 and make the tail of the screw protrude out of the gun head 22, facilitating the subsequent operation of the tightening assembly.

[0058] In actual application, the gun head 22 is arranged downward and the cylinder body 21 is located above the gun head 22. The screw feeding assembly 1 is started, gas is blown out of the gas blowing channel to form an air flow to push the screw to move along a set path, and due to the use state of the tightening module, the screw is also affected by its own gravity when moving, and finally the screw enters the gun head 22 and the tail of the screw protrudes out of the gun head 22 as required.

[0059]

[0060] ​​The tail of the screw extends out of the gun head 22 as required, so that when the head 8 is moved to the second position, the screw is adjusted to align with the hole to be installed by observing the correspondence between the tail of the screw and the hole to be installed.

[0061] The application realizes the screw feeding function in a simple and reliable manner, ensures that the screw accurately reaches the specified position and is in a state convenient for subsequent operation, improves the screw feeding efficiency and stability of the entire tightening module, and helps to continuously and efficiently complete the assembly task.

[0062] In an embodiment, as shown in Figure 3 The inner peripheral wall of the first piston 41 and the inner peripheral wall of the second piston 42 are respectively connected with the outer peripheral wall of the spline sleeve 3, the outer peripheral wall of the first piston 41 is movably and sealingly connected with the cavity wall of the first cavity 23, and the outer peripheral wall of the second piston 42 is movably and sealingly connected with the cavity wall of the second cavity 24, so as to ensure that the piston can drive the spline sleeve 3 to move as required when moving in the corresponding cavity.

[0063] The outer peripheral wall of the first piston 41 is provided with a sealing ring, and the sealing ring is sealingly connected with the inner wall of the first cavity 23. The outer peripheral wall of the second piston 42 is provided with a sealing ring, and the sealing ring is sealingly connected with the inner wall of the second cavity 24.

[0064] In this embodiment, when the low-pressure cavity 43 or the high-pressure cavity 44 is ventilated, the pressure generated by the gas acts on the corresponding surface of the corresponding piston (for example, acts on the first piston 41 when the low-pressure cavity 43 is ventilated), so that the piston can only move axially along the cavity axis, thereby driving the spline sleeve 3 connected thereto to move in the cylinder body 21.

[0065] The piston with the ring body structure in the application makes the connection of the piston with the spline sleeve 3 and the cavity wall more reasonable and stable, can effectively transmit the power generated by the gas pressure, ensures the accuracy and reliability of the movement of each component under different ventilation states, reduces the movement jamming and other problems caused by unstable structure, and helps the tightening module to operate stably for a long time.

[0066] In an embodiment, as shown in Figure 3 , Figure 5 and Figure 8 The small-diameter end 52 includes a connecting portion 521 connected with the large-diameter end 51 and a mounting portion 523 connected with the connecting portion 521, the diameter of the connecting portion 521 is smaller than the diameter of the mounting portion 523, a first step structure is formed at the connection between the connecting portion 521 and the mounting portion 523, and an annular clamping groove 522 is formed on the step surface of the first step structure.

[0067] The connecting part 521 is sleeved with the spring sleeve 6 at the connecting part of the connecting part 521 and the mounting part 523. The inner wall of the spring sleeve 6 is formed with a second step structure matched with the first step structure. The second step structure is provided with a clamping ring matched with the clamping groove 522 to ensure the fixation of the spring sleeve 6 and the connection tightness between the components.

[0068] In the embodiment, during the assembly stage of the tightening module, the spring sleeve 6 is sleeved on the spline shaft 5 at the corresponding position. The spring sleeve 6 is fixed at the connecting part of the connecting part 521 and the mounting part 523 through the clamping and matching of the clamping ring and the clamping groove 522.

[0069] During the subsequent working process of the tightening module, when the spline sleeve 3 contacts the spring 7, the assembly composed of the spline shaft 5, the spline sleeve 3 and the like will stop moving due to the elastic force of the spring 7. The stop position is the second position. The pre-compression amount of the spring 7 plays a key role in this process.

[0070] Suppose the screw is longer. In the tightening operation, in order to enable the chuck 8 to contact the screw head at a suitable position and perform subsequent positioning and tightening operations, the chuck 8 needs to stop moving earlier, that is, the second position needs to be advanced. This is because if the movement distance of the chuck 8 is too long (corresponding to the pre-compression amount of the spring 7 being too small), the chuck 8 may not be able to accurately contact the head of the longer screw, or may cause damage to the screw or workpiece when contacting due to excessive movement.

[0071] In order to make the chuck 8 stop moving earlier, it is necessary to increase the pre-compression amount of the spring 7. Because a larger pre-compression amount means that the spring 7 can generate sufficient elastic force to stop the movement of the chuck 8 when being further compressed, thereby advancing the second position and ensuring that the chuck 8 can accurately align with the head of the longer screw to achieve precise positioning.

[0072] The change of the pre-compression amount of the spring 7 is realized by replacing the spring sleeve 6 of different models (thicknesses). The spring sleeve 6 plays a role in limiting the initial position of the spring 7 in the entire structure.

[0073] When a thicker spring sleeve 6 is replaced, the spring 7 will be compressed more in the initial installation state, that is, the pre-compression amount is increased. This is because the thicker spring sleeve 6 reduces the initial stretching space of the spring 7, so that the spring 7 is in a more compressed state after installation.

[0074] Conversely, if a thinner spring retainer 6 is used, the initial extension space of the spring 7 increases, and the pre-compression decreases. In this way, by selecting a spring retainer 6 of appropriate thickness according to the actual screw length used, the pre-compression of the spring 7 can be flexibly adjusted to meet the requirements of different screw lengths for the second position during tightening.

[0075] In one embodiment, the outer periphery of the mounting portion 523, away from the connecting portion 521, protrudes outward to form a limiting portion 524. The spring 7 is sleeved on the mounting portion 523, and both ends of the spring 7 abut against the spring retainer 6 and the limiting portion 524, respectively. The mounting portion 523 may protrude partially or entirely outward to form the limiting portion 524.

[0076] In this embodiment, when the movement of the internal components of the tightening module causes the spring 7 to be stressed, such as when the spline sleeve 3 moves and squeezes the spring 7, the spring 7 begins to compress, and the other end is held in place by the limiting part 524, ensuring that the deformation of the spring 7 is within a reasonable range.

[0077] The limiting part 524 of this application effectively controls the deformation range of the spring 7, prevents the spring 7 from being damaged due to excessive compression, improves the service life of the spring 7, and ensures that the spring 7 can play a stable role in the tightening module.

[0078] In one embodiment, such as Figures 5-7 As shown, the spline sleeve 3 includes a sleeve body 31 and a plurality of first splines 32 disposed on the inner wall of the sleeve body 31, and a first spline groove 33 is formed between two adjacent first splines 32.

[0079] The large-diameter end 51 includes a shaft 511 and a plurality of second splines 512 disposed on the outer wall of the shaft 511. A second spline groove 513 is formed between two adjacent second splines 512. The first spline 32 mates with the second spline groove 513, and the second spline 512 mates with the first spline groove 33. This structure allows the spline sleeve 3 to both rotate around the axis on the spline shaft 5 and move axially along the spline shaft 5, thus achieving a specific motion function.

[0080] In this embodiment, when the tightening module is working, when the first piston 41 or the second piston 42 drives the spline sleeve 3 to move, the spline sleeve 3 moves axially along the spline shaft 5 by relying on the cooperation between the first spline 32 and the second spline groove 513 on the spline shaft 5, and the cooperation between the second spline 512 and its own first spline groove 33. When it is necessary to tighten the screw by rotation, the spline sleeve 3 can rotate smoothly around the axis of the spline shaft 5, transmitting torque to the screwdriver bit 8, driving the screw to rotate and tighten.

[0081] The application ensures that the spline sleeve 3 and the spline shaft 5 can not only rotate relatively to transmit torque, but also move relatively to realize position adjustment, so that the power transmission and component movement inside the tightening module are more accurate and reliable.

[0082] In an embodiment, the diameter of the shaft body 511 is greater than the diameter of the mounting portion 523 and less than the outer diameter of the spring 7, and the diameter of the circle surrounded by the plurality of first splines 32 near one end of the shaft body 511 is greater than the diameter of the mounting portion 523 and less than the outer diameter of the spring 7, so that when the spline sleeve 3 moves in the cylinder body 21, one end of the spring 7 can be switched from pressing against the spring retainer 6 to pressing against the first spline 32.

[0083] In this embodiment, when the spline sleeve 3 moves in the cylinder body 21, one end of the spring 7 can be switched from pressing against the spring retainer 6 to pressing against the first spline 32, realizing flexible change of the spring 7 action position to adapt to the requirements in different working states.

[0084] With the movement of each component in the tightening module according to different ventilation states and movement requirements, the position of the spline sleeve 3 in the cylinder body 21 changes, and when a specific position is reached, due to the above size relationship, one end of the spring 7 will be separated from the originally pressed spring retainer 6 and pressed against the first spline 32, thereby changing the force transmission path of the spring 7.

[0085] The application realizes dynamic change of the spring 7 action position through this ingenious size design, so that the tightening module can flexibly adjust the force transmission mode according to actual needs in different working stages, further optimizing the cooperative working effect between components.

[0086] In an embodiment, as shown in Figure 2 The cylinder body 21 is divided into a first cavity 23 and a second cavity 24 by a mounting seat 25, the first end of the first cavity 23 and the first end of the second cavity 24 are respectively the first ends of the first cavity 23 and the second cavity 24, the second end of the first cavity 23 and the second end of the second cavity 24 are respectively the second ends of the first cavity 23 and the second cavity 24, the low-pressure cavity 43 is formed between the first piston 41 and the first end of the first cavity 23, and the high-pressure cavity 44 is formed between the second piston 42 and the first end of the second cavity 24.

[0087] In this embodiment, the mounting seat 25 plays a key role in separating and defining the cavities, ensuring that the air pressures of different cavities can be independently controlled and do not interfere with each other.

[0088] When the tightening module is working, gas enters or is discharged from the low-pressure cavity 43 and the high-pressure cavity 44 through the corresponding gas holes, and the gas pressure changes in the space defined by the piston and the end of the cavity, thereby pushing the piston to move in the respective cavity and further driving the spline sleeve 3 to move, so as to realize a series of operations such as feeding, positioning, and screwing.

[0089] The present application reasonably separates two independent cavities by the mounting seat 25, so that the low-pressure cavity 43 and the high-pressure cavity 44 can be accurately controlled in terms of gas pressure, thereby accurately controlling the movement of the piston and the operation of each component.

[0090] In an embodiment, the mounting seat 25 is a ring structure, the spline sleeve 3 penetrates the mounting seat 25, and the outer peripheral wall of the spline sleeve 3 is in sliding connection with the inner peripheral wall of the mounting seat 25. The inner wall of the mounting seat 25 is provided with a sealing ring, which is in sealing connection with the outer peripheral wall of the spline sleeve 3. Such a connection mode ensures that the spline sleeve 3 can smoothly move in the mounting seat 25 in the cylinder body 21, and also ensures the relative independence of the first cavity 23 and the second cavity 24 during movement.

[0091] In the present embodiment, during the working process of the tightening module, whether the spline sleeve 3 is axially moved under the driving of the piston or transmits torque during rotation, the sliding connection between the spline sleeve 3 and the inner peripheral wall of the mounting seat 25 ensures its stable movement. For example, when the chuck 8 moves to different positions and screws the screw, the spline sleeve 3 stably functions by relying on the sliding connection, and does not jam or affect the cooperation with other components due to the connection problem with the mounting seat 25.

[0092] In an embodiment, the cylinder body 21 is provided with two gas holes communicating with the low-pressure cavity 43 and the high-pressure cavity 44 respectively, which are used for gas intake or discharge. By controlling the gas intake and discharge of the gas holes, the gas pressure in the low-pressure cavity 43 and the high-pressure cavity 44 can be adjusted, thereby realizing the control of the movement of the piston and each component of the tightening module.

[0093] In the present embodiment, during different working stages of the tightening module, the gas intake or discharge operation of the gas holes is controlled as needed. For example, during the feeding stage, the low-pressure cavity 43 is ventilated through the corresponding gas hole according to the control requirement, so that the first piston 41 drives the spline sleeve 3 to move; during the positioning stage, the low-pressure cavity 43 and the high-pressure cavity 44 are simultaneously ventilated through the corresponding gas holes, so that the second piston 42 drives the spline sleeve 3 to move; and during the screwing stage, the low-pressure cavity 43 is discharged and the high-pressure cavity 44 is ventilated, so as to realize the final position movement of the chuck 8 and the screwing of the screw. The entire tightening module works according to the process by precisely controlling the gas intake and discharge of the gas holes.

[0094] In summary, in actual application, the gun head 22 is arranged downwardly and the cylinder body 21 is arranged above the gun head 22. Therefore, the working process of the tightening assembly is as follows:

[0095] The high-pressure assembly is connected with the high-pressure cavity 44, the low-pressure assembly is connected with the low-pressure cavity 43, and the spring 7 between the high-pressure cavity 44 and the low-pressure cavity 43 is in a compressed state. At this time, the high-pressure cavity 44 is not connected with compressed air, the low-pressure cavity 43 is connected with compressed air, and under the action of the pressure difference, the spline sleeve 3 moves upwardly until reaching the first position (as shown in Figure 2 ), to prepare for the subsequent tightening operation. At this time, the feeding assembly feeds the screw into the gun head 22, and the tail of the screw extends out of the gun head 22.

[0096] Then, the high-pressure cavity 44 is connected with high-pressure compressed air, and the low-pressure cavity 43 is connected with low-pressure compressed air. Since the pressure of the high-pressure cavity 44 is higher than that of the low-pressure cavity 43, under the action of the pressure difference, the spline sleeve 3 starts to move downwardly.

[0097] With the movement of the spline sleeve 3, the spline sleeve 3 gradually contacts the spring 7, and the spring 7 changes from being pressed against the spring retainer 6 to being pressed against the spline sleeve 3. At this time, the elastic force of the spring 7 starts to work, to prevent the spline sleeve 3 from continuing to move, that is, the pressure generated between the high pressure and the low pressure and the elastic force generated when the spring 7 is compressed reach a balance state, reaching the second position (as shown in Figure 3 ).

[0098] At the second position, the batch head 8 is close to the screw to be installed and is preliminarily aligned with the screw, and the batch head 8 can prevent the screw from moving into the gun head 22 during positioning, to avoid affecting the positioning of the screw and the hole to be installed.

[0099] Then, the high-pressure cavity 44 continues to be connected with high-pressure compressed air, and the low-pressure cavity 43 stops being connected with air. At this time, the pressure generated by the high-pressure compressed air in the high-pressure cavity 44 is greater than the elastic force generated when the spring 7 is completely compressed, the spline sleeve 3 overcomes the maximum elastic force of the spring 7, continues to move downwardly, and stops at the third position (as shown in Figure 4 ).

[0100] In this process, the batch head 8 accurately positions the screw at the hole to be installed, and in the subsequent movement, the torque is transmitted to the batch head 8 through the cooperation of the spline sleeve 3 and the spline shaft 5, to drive the screw to rotate, thereby completing the tightening operation of the screw.

[0101] After the screw tightening operation is completed, in order to tighten the screw again subsequently, the spline sleeve 3 needs to move from the third position to the first position. At this time, the low-pressure cavity 43 is connected with low-pressure gas, the high-pressure cavity 44 is not connected with air, and the gas in the high-pressure cavity 44 is discharged.

[0102] After the low pressure cavity 43 is connected to the low pressure gas, the gas will generate a certain pressure in the low pressure cavity 43, and this pressure acts on the first piston 41. Since the high pressure cavity 44 is not connected to the gas at this time, there is no pressure in the opposite direction to hinder the movement of the first piston 41. Under the driving of the low pressure gas, the spline sleeve 3 will obtain an upward force and start to move upward, i.e., move towards the first position.

[0103] During the upward movement, the compression of the spring 7 gradually decreases, and the stored elastic force of the spring 7 starts to be released. When the spring 7 releases the elastic force to a certain extent, the one end of the spring 7 will contact the spring stop sleeve 6.

[0104] At this time, the spline sleeve 3 is continuously moving upward and gradually approaching the first position. When the spline sleeve 3 finally reaches the first position, the spring 7 has just completed the change from the highly compressed state to the state of contacting the spring stop sleeve 6. The components return to the initial preparation state, and wait for the next tightening operation instruction.

[0105] The working process of the whole tightening assembly is realized by accurately controlling the gas pressure in the high pressure cavity 44 and the low pressure cavity 43, and skillfully using the elastic force of the spring 7. The accurate movement and positioning of the components are realized, and the tightening operation of the screw is efficiently and accurately completed.

[0106] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered to fall within the protection scope of the present application.

Claims

1. A hand-held screwing module, characterized in that, The screw feeding assembly and the screw tightening assembly, A cylinder is connected with the screw feeding assembly through a gun head at one end, the gun head is used for receiving the screw delivered by the screw feeding assembly, and the cylinder includes a first cavity and a second cavity which are independent of each other; A spline sleeve is connected with a first piston at one end and connected with a second piston at the other end, the first piston is arranged in the first cavity to form a low-pressure cavity, and the second piston is arranged in the second cavity to form a high-pressure cavity, air is supplied into the low-pressure cavity and / or the high-pressure cavity to move the first piston and the second piston in the first cavity and the second cavity respectively, so as to drive the spline sleeve to move in the cylinder; A spline shaft is arranged in the spline sleeve and can drive the spline sleeve to rotate around the axis of the spline shaft, the spline shaft includes a large-diameter end and a small-diameter end, a spring retainer and a spring are arranged on the small-diameter end, the spring retainer is close to the large-diameter end, and one end of the spring is pressed against the spring retainer; A chuck is connected with one end of the spline sleeve in the second cavity and is in contact with the screw, and the chuck drives the screw to rotate when the spline sleeve drives the chuck to rotate; When air is supplied into the low-pressure cavity and no air is supplied into the high-pressure cavity, the first piston drives the spline sleeve to move into the first cavity, the spline sleeve drives the chuck to move to a first position when the spline sleeve moves, so that the screw feeding assembly can feed the screw; When air is supplied into the low-pressure cavity and the high-pressure cavity, the second piston drives the spline sleeve to move into the second cavity, the spline sleeve drives the chuck to move from the first position to a second position when the spline sleeve moves, and the chuck prevents the screw from moving into the gun head, so that the screw is positioned with the hole to be installed; When no air is supplied into the low-pressure cavity and air is supplied into the high-pressure cavity, the second piston continues to drive the spline sleeve to move into the second cavity, the spline sleeve drives the chuck to move from the second position to a third position when the spline sleeve moves, so that the screw tightening assembly completes the screwing of the screw.

2. The hand-held tightening module of claim 1, wherein, The screw feeding assembly includes a gas blowing channel, and the gas blown through the gas blowing channel is used to feed the screw into the gun head and make the tail of the screw protrude out of the gun head.

3. The hand-held tightening module of claim 1, wherein, The first piston and the second piston are both ring structures, the inner circumferential wall of the first piston and the inner circumferential wall of the second piston are connected with the outer circumferential wall of the spline sleeve respectively, the outer circumferential wall of the first piston is connected with the cavity wall of the first cavity, and the outer circumferential wall of the second piston is connected with the cavity wall of the second cavity.

4. The hand-held tightening module of claim 1, wherein, The small-diameter end includes a connecting portion connected with the large-diameter end and a mounting portion connected with the connecting portion, the diameter of the connecting portion is smaller than the diameter of the mounting portion, a first step structure is formed at the connection position of the connecting portion and the mounting portion, an annular clamping groove is formed in the step surface of the first step structure, The connecting part is sleeved with the spring stop sleeve at the connection with the mounting part, an inner wall of the spring stop sleeve is formed with a second stepped structure matched with the first stepped structure, and a clamping ring matched with the clamping groove is arranged on a stepped surface of the second stepped structure.

5. The hand-held screwdriving module of claim 4 wherein, An outer periphery of one end of the mounting part away from the connecting part is outwardly protruded to form a limiting part, the spring is sleeved on the mounting part, and two ends of the spring are respectively abutted against the spring stop sleeve and the limiting part.

6. The hand-held screwdriving module of claim 4 wherein, The spline sleeve comprises a sleeve body and a plurality of first splines arranged on an inner wall of the sleeve body, The large-diameter end comprises a shaft body and a plurality of second splines arranged on an outer wall of the shaft body, 7. The hand-held screwdriving module of claim 6 wherein, A diameter of the shaft body is greater than a diameter of the mounting part and less than an outer diameter of the spring, and a diameter of a circle surrounded by the plurality of first splines close to one end of the shaft body is greater than the diameter of the mounting part and less than the outer diameter of the spring, so that one end of the spring can be changed from abutting against the spring stop sleeve to abutting against the first spline when the spline sleeve moves in the cylinder body.

8. The hand-held screwdriving module of claim 1 wherein, The cylinder body is divided into a first cavity and a second cavity independent of each other by a mounting seat, one end of the first cavity and the second cavity close to the mounting seat is a first end of each cavity respectively, one end of the first cavity and the second cavity away from the mounting seat is a second end of each cavity respectively, the low-pressure cavity is formed between the first piston and the first end of the first cavity, and the high-pressure cavity is formed between the second piston and the first end of the second cavity.

9. The hand-held screwdriving module of claim 8 wherein, The mounting seat is in a ring body structure, the spline sleeve penetrates through the mounting seat, and an outer peripheral wall of the spline sleeve is in sliding connection with an inner peripheral wall of the mounting seat.

10. The hand-held tightening module of claim 1, wherein, The cylinder body is provided with two air holes respectively communicated with the low-pressure cavity or the high-pressure cavity, and the air holes are used for air intake or exhaust.

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