A pressure foot that facilitates stable switching

Abstract

This invention discloses a pressure foot that facilitates stable switching, belonging to the technical field of drilling machines. It includes a base and a sliding seat, the sliding seat slidingly engaging with the base. The base is provided with a driving component for driving the sliding seat to slide. The base has a through-hole working cavity. The sliding seat has three pressure rings distributed along its sliding direction. Limiting components are provided on both sides of the base. The sliding seat is located between two limiting components. When both ends of the sliding seat abut against the two limiting components, the pressure rings near the ends of the sliding seat communicate with the working cavity. The base is provided with a positioning component for positioning the sliding seat. When the positioning component positions the sliding seat, the working cavity communicates with the pressure ring in the middle of the sliding seat. This application has the effect of facilitating rapid drilling of three different sized holes in a substrate.

Description

Technical Field

[0001] This invention relates to the field of drilling machines, and in particular to a pressure foot that facilitates stable switching. Background Technology

[0002] Printed circuit boards (PCBs) are carriers that support electronic components and enable electrical connections between them. During the production process, PCBs typically require copper foil to be covered on the surface of a substrate, followed by etching to form circuitry. Then, a drilling machine is used to drill small holes at designated locations on the substrate for the insertion of pins of electronic components, thereby conducting circuits between the electronic components.

[0003] In related technologies, drilling machines typically use pressure rings on pressure feet to press the substrate during drilling. The pressure rings have through holes for the drill bit to pass through. Sometimes, two pressure rings are used, and a cylinder drives the two pressure rings with different through hole sizes to switch between them, so as to quickly achieve drilling of two different hole sizes required for the substrate.

[0004] Regarding the aforementioned technologies, when drilling three holes of different sizes into the substrate, workers usually need to manually replace the pressure rings of different sizes, which is cumbersome and inefficient. Summary of the Invention

[0005] To facilitate rapid drilling of three different hole sizes required in the substrate, this application provides a pressure foot that allows for stable switching.

[0006] The pressure foot provided in this application, which facilitates stable switching, adopts the following technical solution:

[0007] A pressure foot that facilitates stable switching includes a base and a sliding seat. The sliding seat is slidably fitted onto the base. The base is provided with a driving component for driving the sliding seat to slide. The base has a through-hole working cavity. The sliding seat has three pressure rings distributed along its sliding direction. Limiting components are provided on both sides of the base. The sliding seat is located between two limiting components. When the two ends of the sliding seat abut against the two limiting components, the pressure rings near the two ends of the sliding seat are respectively connected to the working cavity. The base is provided with a positioning component for positioning the sliding seat. When the positioning component positions the sliding seat, the working cavity is connected to the pressure ring in the middle of the sliding seat.

[0008] By adopting the above technical solution, when drilling holes of three different sizes required in the substrate, the sliding position of the driven sliding seat is limited sequentially by two limiting components and a positioning component. This facilitates drilling holes of three different sizes in the substrate using three pressure rings. During the drilling process, there is no need for operators to manually replace pressure rings of different sizes. The positioning component and two limiting components limit the position of the sliding seat, making the operation simple and improving work efficiency. At the same time, the positioning component and two limiting components help ensure the stability of the working cavity when connected to one of the positioning rings, thus further ensuring the accuracy of drilling holes of different sizes in the substrate.

[0009] Optionally, the positioning assembly includes a positioning cylinder and a positioning column. The positioning cylinder is mounted on the base, and the positioning column is fixedly mounted on the piston rod of the positioning cylinder. The positioning cylinder passes through the base and slides in cooperation with the base. When the working chamber is connected to the pressure ring in the middle of the sliding seat, one end of the sliding seat abuts against the side of the positioning column.

[0010] By adopting the above technical solution, the positioning cylinder can drive its own piston rod to move, which can enable the positioning column to position or not position the sliding seat, thus making the positioning structure of the sliding seat simple, convenient and fast.

[0011] Optionally, one end of the sliding seat is provided with a positioning groove that engages with the positioning post. When the working cavity is connected to the pressure ring in the middle of the sliding seat, the side of the positioning post abuts against the wall of the positioning groove.

[0012] By adopting the above technical solution, the positioning groove increases the contact area between the positioning column and the sliding seat when the positioning column positions the sliding seat. This makes it less likely for the sliding seat to be damaged due to excessive pressure between it and the positioning column when it is positioned by the positioning column, which helps to ensure the service life of the sliding seat and the positioning column.

[0013] Optionally, the positioning cylinder is fixedly installed on the side of the base away from the sliding seat by bolts, and the positioning column passes through the base along the axial direction of the working cavity and slides with the base.

[0014] By adopting the above technical solution, the installation space required for the positioning cylinder is small, and the position of the positioning cylinder after installation is less likely to interfere with the movement of the sliding seat. At the same time, the placement of the positioning pin facilitates faster and more accurate positioning of the sliding seat after it has moved. In addition, it also makes it easier for staff to observe the position of the sliding seat after it has been positioned.

[0015] Optionally, the base includes a fixing part and an mounting part, the mounting part is integrally connected to the fixing part, and the mounting part has an arc-shaped sliding groove on the side away from the fixing part. The working cavity is connected to the sliding groove, and the sliding seat is slidably fitted in the sliding groove, and the cross-section of the sliding seat and the sliding groove are both T-shaped.

[0016] By adopting the above technical solution, the T-shaped arrangement of both the sliding seat and the sliding groove helps to fully ensure the stability of the sliding seat when it slides in the sliding groove. At the same time, the integral connection of the fixing part and the mounting part helps to fully ensure the structural strength and structural stability of the base, thereby making it less likely for the relative positions of the fixing part and the mounting part to shift, and making it easier to more accurately ensure the stability of the position of the sliding seat after it slides.

[0017] Optionally, the driving component includes a driving cylinder, one end of the piston rod of the driving cylinder has a spherical connecting part, one end of the sliding seat has a movable groove, the movable groove extends to both sides in the thickness direction of the sliding seat, and the spherical connecting part is movably connected in the movable groove.

[0018] By adopting the above technical solution, when the drive cylinder drives its own piston rod to move, the sliding seat slides in the sliding groove due to the cooperation between the spherical connecting part and the movable groove. The cooperation between the spherical connecting part and the movable groove makes the connection structure between the drive cylinder and the sliding seat simple and practical, and at the same time makes it easy to ensure the stability of the sliding seat when it slides in the sliding groove. In addition, the groove extending to the top of the sliding seat makes it easy to quickly put the spherical connecting part into the movable groove to realize the connection between the drive cylinder and the sliding seat.

[0019] Optionally, the sliding groove extends to both sides of the mounting part, and both limiting members are fixed to the mounting part by bolts. The driving cylinder is fixedly installed on one of the limiting members by bolts. The limiting member away from the driving cylinder has two stop portions. The end of the sliding seat away from the driving cylinder is provided with a sliding indicator portion. The width of the sliding indicator portion is smaller than the distance between the two stop portions.

[0020] By adopting the above technical solution, the setting of the limiting component being bolted to the mounting part facilitates the assembly between the sliding seat and the base. At the same time, when the limiting component is damaged, it can be replaced separately, which helps to reduce maintenance costs. In addition, when the sliding seat abuts against the limiting component away from the drive cylinder, the sliding indicator is inserted between the two positions, which makes it easy for the operator to intuitively observe the position of the sliding seat, so as to quickly adjust the corresponding components according to the processing situation. Furthermore, by setting two positions, the sliding seat can be inserted between the two positions, which helps to further reduce the external dimensions of the base while ensuring processing accuracy, reduce processing costs, and improve the adaptability of the base installation.

[0021] Optionally, the three pressure rings are respectively designated as a first pressure ring, a second pressure ring, and a third pressure ring. The first pressure ring has a first through hole with a diameter between 1 mm and 2 mm. The second pressure ring has a second through hole with a diameter between 2 mm and 3 mm. The third pressure ring has a third through hole with a diameter between 9.5 mm and 10.5 mm.

[0022] By adopting the above technical solution, it is convenient to achieve high-precision drilling of three different hole sizes required in the substrate through the three through holes of three pressure rings with three different hole diameters.

[0023] Optionally, the first pressure ring is located at the free end of the sliding seat near or away from the driving cylinder, and the first pressure ring has a plurality of air float holes evenly distributed around its own axis. The end of the sliding seat near or away from the driving cylinder has a vent hole that communicates with each air float hole.

[0024] By adopting the above technical solution, after gas is introduced into the vent hole, the gas is discharged through each air float hole. The gas discharged through the air float hole causes an air float layer to be formed between the first pressure ring and the substrate to be processed. This prevents the substrate from directly contacting the first pressure ring during drilling, thereby reducing indentations on the printed circuit board and reducing problems such as broken pins and misaligned holes caused by indentations. This facilitates higher precision drilling of 1mm to 2mm micro-holes in the substrate. In addition, the arrangement of the air float hole close to or far from the drive cylinder helps to reduce the length of the air pipe connecting the air float hole to the outside, making it easier to quickly introduce gas into the air float hole through the air pipe.

[0025] Optionally, the sliding seat has three mounting holes distributed along its sliding direction, and the three pressure rings are respectively engaged in the three mounting holes. Each of the three mounting holes is fitted with an elastic sealing gasket for pressing the pressure rings together.

[0026] By adopting the above technical solution, it is easy to disassemble, maintain or replace the pressure ring, ensuring the performance of the pressure ring. At the same time, the elastic sealing gasket's clamping action on the pressure ring helps to fully guarantee the sealing stability of the pressure ring's location after installation.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During the drilling process of the three required holes of different sizes on the substrate, there is no need for the operator to manually replace the pressure rings of different sizes. The position of the sliding seat can be limited by the positioning component and two limiting parts, which makes the operation of the operator simple and helps to improve work efficiency.

[0029] 2. The integrated connection of the fixing part and the mounting part helps to fully guarantee the structural strength and stability of the base, thus making it less likely for the relative positions of the fixing part and the mounting part to shift, and making it easier to more accurately guarantee the stability of the sliding seat after sliding.

[0030] 3. The substrate and the first pressure ring do not directly contact each other during drilling, which reduces the indentation on the printed circuit board and reduces problems such as broken pins and misaligned holes caused by indentation. This facilitates higher precision drilling of 1mm to 2mm micro-holes in the substrate. In addition, the setting of the air float hole close to or far from the drive cylinder helps to reduce the length of the air pipe connecting the air float hole to the outside, and facilitates the rapid introduction of gas into the air float hole through the air pipe. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0032] Figure 2 This is a cross-sectional schematic diagram of the overall structure of Embodiment 1 of this application.

[0033] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0034] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0035] Figure 5 This is a schematic diagram of the connection relationship between the first pressure ring and the sliding seat in Embodiment 2 of this application.

[0036] Figure 6 yes Figure 5 A magnified view of part B in the diagram.

[0037] Figure 7 This is a schematic diagram of the structure of the first pressure ring in Embodiment 2 of this application.

[0038] Figure 8 This is a schematic diagram of the overall structure of Embodiment 3 of this application.

[0039] Figure 9 yes Figure 8 A magnified view of part C in the middle.

[0040] Figure 10 This is a schematic diagram of the overall structure of Embodiment 4 of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Base; 101. Fixing part; 102. Mounting part; 2. Sliding seat; 3. Sliding groove; 4. Working chamber; 5. Limiting part; 501. Limiting part; 502. Stopping part; 6. Connecting part; 7. Drive cylinder; 8. Spherical connecting part; 9. Movable groove; 10. Protrusion; 11. Sliding indicator part; 12. Mounting hole; 13. Pressure ring; 131. First pressure ring; 132. Second pressure ring; 133. Third pressure ring; 14. First through hole; 15. Second through hole; 16. Third through hole; 17. Positioning cylinder; 18. Positioning column; 19. Positioning groove; 20. Air float hole; 21. Vent hole; 211. Straight section; 212. Annular section; 22. Pressing part; 23. Elastic sealing gasket; 24. Relief groove. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0044] Example 1.

[0045] This application discloses a pressure foot that facilitates stable switching. (Refer to...) Figure 1 The pressure foot for easy and stable switching includes a base 1 and a sliding seat 2. The base 1 includes a fixing part 101 and a mounting part 102. The mounting part 102 is integrally connected to the fixing part 101, and the side of the mounting part 102 away from the fixing part 101 is arc-shaped.

[0046] Reference Figure 2 and Figure 3 The mounting part 102 has an arc-shaped sliding groove 3 on the side away from the fixing part 101, which is consistent with its own curvature. The sliding groove 3 extends to both sides of the mounting part 102. The fixing part 101 has a through working cavity 4 in the middle, which is connected to the sliding groove 3. The sliding seat 2 slides and fits in the sliding groove 3. The sliding seat 2 is also arc-shaped with the same curvature as the mounting part 102. The longitudinal section of both the sliding seat 2 and the sliding groove 3 is T-shaped to ensure the stability of the sliding seat 2 when sliding in the sliding groove 3.

[0047] Reference Figure 1 and Figure 2 Limiting members 5 are provided on both sides of the mounting part 102. The limiting member 5 includes a limiting part 501 and two stop parts 502. The two stop parts 502 are integrally connected to one side of the limiting part 501. The two stop parts 502 are fixedly installed on the mounting part 102 by a bolt, and the two stop parts 502 abut against the mounting part 102. The two stop parts 502 are located at the groove opening of the sliding groove 3, so as to limit the sliding seat 2 when it slides in the sliding groove 3 by blocking the sliding seat 2 through the stop parts 502.

[0048] Reference Figure 1 and Figure 3One of the limiting members 5 has a limiting part 501 integrally connected to a connecting part 6. The connecting part 6 is located near the limiting part 501 on the side away from the mounting part 102, and both sides of the connecting part 6 are integrally connected to two stop parts 502 respectively. The connecting part 6 is provided with a driving member. In this embodiment, the driving member is selected as a driving cylinder 7 that is fixedly installed in one of the connecting parts 6 by bolts. One end of the piston rod of the driving cylinder 7 is integrally connected to a spherical connecting part 8. The sliding seat 2 has a movable groove 9 at one end near the driving cylinder 7. The movable groove 9 extends to both sides in the thickness direction of the sliding seat 2. The spherical connecting part 8 is movably connected in the movable groove 9 so that when the driving cylinder 7 drives its own piston rod to move, the spherical connecting part 8 drives the sliding seat 2 to slide in the sliding groove 3.

[0049] Reference Figure 1 The sliding seat 2 is integrally connected to a protrusion 10 at one end near the drive cylinder 7. When the drive cylinder 7 drives its piston rod to be in the retracted state, the sliding seat 2 abuts against the two stop portions 502 of the limiting member 5 near the drive cylinder 7, and the protrusion 10 is located between the two stop portions 502 near the drive cylinder 7, so that the sliding seat 2 is less likely to interfere with the limiting member 5 when sliding, and at the same time ensures the stability of the position of the sliding seat 2 after it moves. The end of the sliding seat 2 away from the drive cylinder 7 is integrally connected to a sliding indicator 11. The width of the sliding indicator 11 is smaller than the distance between the two position parts 502. When the sliding seat 2 abuts against the two position parts 502 of the limiting member 5 away from the drive cylinder 7, the sliding indicator 11 passes through the gap between the two position parts 502 and extends outside the base 1. This makes it easy for the operator to observe the position of the sliding seat 2 directly. This facilitates timely adjustment of the corresponding parts according to the processing situation. Furthermore, by setting two position parts 502, it is possible to further reduce the external dimensions of the base 1 while ensuring processing accuracy, thereby reducing processing costs and improving the installation adaptability of the base 1.

[0050] Reference Figure 2 and Figure 3 The sliding seat 2 has three mounting holes 12 evenly distributed along its sliding direction. Each mounting hole 12 is fitted with a pressure ring 13 to facilitate quick disassembly and maintenance of each pressure ring 13. An elastic sealing gasket 23 is embedded in each of the three mounting holes 12. The inner side of the elastic sealing gasket 23 abuts against the outer circumferential surface of the pressure ring 13 to ensure the sealing stability of each pressure ring 13 after it is installed in its respective mounting hole 12.

[0051] Continue to refer to Figure 2 and Figure 3The three pressure rings 13 are respectively designated as a first pressure ring 131, a second pressure ring 132, and a third pressure ring 133. The first pressure ring 131 has a through-hole 14 with a diameter between 1 mm and 2 mm; in this embodiment, the diameter of the first through-hole 14 is 2 mm. The second pressure ring 132 has a through-hole 15 with a diameter between 2 mm and 3 mm; in this embodiment, the diameter of the second through-hole 15 is 3 mm. The third pressure ring 133 has a third through-hole 16 with a diameter between 9.5 mm and 10.5 mm; in this embodiment, the diameter of the third through-hole 16 is 10 mm. In this embodiment, the first pressure ring 131 is positioned close to the drive cylinder 7, the second pressure ring 132 is positioned away from the drive cylinder 7, and the third pressure ring 133 is located between the first pressure ring 131 and the second pressure ring 132. When the sliding seat 2 abuts against the limiting member 5 close to the drive cylinder 7, the working chamber 4 communicates with the second through hole 15. When the sliding seat 2 abuts against the limiting member 5 away from the drive cylinder 7, the working chamber 4 communicates with the first through hole 14. The two limiting members 5 block and limit the sliding seat 2 at two points, which helps to fully ensure the stability of the positions of the first pressure ring 131 and the second pressure ring 132 when the working chamber 4 is connected to the first through hole 14 and the second through hole 15.

[0052] Reference Figure 1 and Figure 2 The fixing part 101 of the base 1 is provided with a positioning assembly, which includes a positioning cylinder 17 and a positioning column 18. The positioning cylinder 17 is fixedly installed on the side of the mounting part 102 away from the sliding seat 2 by bolts and is arranged parallel to the axis of the working chamber 4. The positioning column 18 is fixedly installed on the piston rod of the positioning cylinder 17. The positioning rod passes through the fixing part 101 along the axis of the working chamber 4 and slides in cooperation with the fixing part 101. When the piston rod of the positioning cylinder 17 is in the extended state, the positioning rod passes through the sliding groove 3. When the piston rod of the positioning cylinder 17 is in the retracted state, the positioning rod is stored in the mounting part 102.

[0053] Reference Figure 1 A positioning groove 19 is provided at the end of the positioning indicator that is away from the driving cylinder 7. The positioning groove 19 extends to both sides of the positioning indicator in the thickness direction. The positioning post 18 is inserted into the positioning groove 19. When the positioning cylinder 17 drives the positioning rod to pass through the sliding groove 3 and the driving cylinder 7 drives the sliding seat 2 to move so that the positioning post 18 is inserted into the positioning groove 19, the positioning post 18 blocks and limits the position of the sliding seat 2. The working cavity 4 is connected to the third through hole 16 of the third pressure ring 133. The blocking and limiting effect of the positioning post 18 helps to fully ensure the stability of the position of the third pressure ring 133 when the third through hole 16 is connected to the working cavity 4.

[0054] The implementation principle of the pressure foot that facilitates stable switching in this application embodiment is as follows: When drilling is required for three holes of different sizes in the substrate, the movement of the positioning column 18 is driven by the two stop parts 502 of the two limiting members 5 and the positioning cylinder 17 in sequence to limit the position of the sliding seat 2 when it slides in the sliding groove 3. This facilitates the drilling of the three holes of different sizes in the substrate through the first pressure ring 131, the second pressure ring 132 and the third pressure ring 133 respectively.

[0055] During the drilling process of the three required holes of different sizes in the substrate, there is no need for the operator to manually replace the pressure rings 13 of different sizes. The position of the sliding seat 2 can be limited by the two limiting parts 5 and the two positioning posts 18, which makes the operation of the operator simple and helps to improve work efficiency. At the same time, when the positioning posts 18 and the two limiting parts 5 limit the sliding seat 2, it helps to fully ensure the stability of the position when the working cavity 4 is connected to one of the positioning rings, which in turn helps to further ensure the accuracy of drilling holes of different sizes in the substrate.

[0056] Example 2.

[0057] Reference Figure 4 and Figure 5 The main difference between this embodiment and Embodiment 1 lies in the specific arrangement of the three pressure rings 13. In this embodiment, the first pressure ring 131 has a through-hole 14 with a diameter between 1 mm and 2 mm; in this embodiment, the diameter of the first through-hole 14 is 1 mm. The second pressure ring 132 has a through-hole 15 with a diameter between 2 mm and 3 mm; in this embodiment, the diameter of the second through-hole 15 is 2 mm. The third pressure ring 133 has a third through-hole 16 with a diameter between 9.5 mm and 10.5 mm; in this embodiment, the diameter of the third through-hole 16 is 10 mm. In this embodiment, the first pressure ring 131 is positioned close to the drive cylinder 7, the third pressure ring 133 is positioned away from the drive cylinder 7, and the second pressure ring 132 is located between the first pressure ring 131 and the third pressure ring 133.

[0058] When the sliding seat 2 abuts against the limiting member 5 near the drive cylinder 7, the working chamber 4 communicates with the third through hole 16. When the sliding seat 2 abuts against the limiting member 5 away from the drive cylinder 7, the working chamber 4 communicates with the first through hole 14. When the positioning pin 18 is inserted into the positioning groove 19, the working chamber 4 communicates with the second through hole 15.

[0059] Reference Figure 6 and Figure 7The first pressure ring 131 has four sets of air flotation holes 20 evenly distributed around its own axis. Each set of air flotation holes 20 has two holes. Each air flotation hole 20 obliquely penetrates the first pressure ring 131. The protrusion 10 has a vent hole 21 connected to the air flotation holes 20 at one end near the drive cylinder 7. The vent hole 21 includes a straight section 211 and an annular section 212. The opening of each air flotation hole 20 near the base 1 is connected to the annular section 212. In this embodiment of the application... The straight section 211 is L-shaped and communicates with the annular section 212. The first pressure ring 131 is integrally provided with a pressing part 22. The pressing part 22 presses against the sliding seat 2 and closes the opening of the annular section 212 to ensure the sealing stability when the straight section 211 is connected to each air flotation hole 20 through the annular section 212. In actual use, the external air pump can be installed into the straight section 211 of the air vent 21 to achieve the air venting process of the external air pump into the air flotation hole 20.

[0060] Reference Figure 4 and Figure 5 After gas is introduced into the vent 21, the gas is discharged through each air float hole 20. The gas discharged from the air float holes 20 forms an air float layer between the first pressure ring 131 and the substrate to be processed. This prevents direct contact between the substrate and the first pressure ring 131 during drilling, thereby reducing indentations on the printed circuit board and reducing problems such as broken pins and misaligned holes caused by indentations. This facilitates higher precision drilling of 1mm micro-holes on the substrate. In addition, the proximity of the air float holes 20 to the drive cylinder 7 helps to reduce the length of the air pipe connecting the air float holes 20 to the outside, facilitating the rapid introduction of gas into the air float holes 20. Moreover, the presence of the air float layer prevents the overall stacking of the printed circuit board from warping when the pressure foot leaves the substrate, thereby reducing the distance required for horizontal position calibration after the drill bit returns, thus reducing the working stroke and effectively improving drilling efficiency.

[0061] Reference Figure 4 The limiting member 5 near the driving cylinder 7 has a through groove 24 extending to the side of the limiting member 5 away from the base 1, for the air supply pipe to pass through. When the air pipe of the external air pump is installed in the straight section 211, the cylinder of the external air pump is located in the groove 24 and is arranged parallel to the driving cylinder 7, so that the air pipe is less likely to interfere with the driving cylinder 7. The implementation principle of Embodiment 2 of this application is the same as that of Embodiment 1, so it will not be described again here.

[0062] Example 3.

[0063] Reference Figure 8 and Figure 9The main difference between this embodiment and Embodiment 2 lies in the positions of the three pressure rings 13. In this embodiment, the first pressure ring 131 has a through-hole 14 with a diameter of 1mm. The second pressure ring 132 has a through-hole 15 with a diameter of 2mm. The third pressure ring 133 has a third through-hole 16 with a diameter of 10mm. In this embodiment, the first pressure ring 131 is positioned away from the drive cylinder 7, the second pressure ring 132 is positioned close to the drive cylinder 7, and the third pressure ring 133 is located between the first pressure ring 131 and the third pressure ring 133.

[0064] Continue to refer to Figure 8 and Figure 9 When the sliding seat 2 abuts against the limiting member 5 near the driving cylinder 7, the working chamber 4 communicates with the first through hole 14. When the sliding seat 2 abuts against the limiting member 5 away from the driving cylinder 7, the working chamber 4 communicates with the second through hole 15. When the positioning pin 18 is inserted into the positioning groove 19, the working chamber 4 communicates with the third through hole 16. In this embodiment, the vent hole 21 is opened at the end of the sliding indicator 11 away from the driving cylinder 7. The straight section 211 of the vent hole 21 is in the shape of a line. When the air pipe of the external cylinder is installed in the straight section 211 of the vent hole 21, the air pipe passes through the gap between the two stop portions 502 away from the driving cylinder 7. The implementation principle of Embodiment 3 of this application is the same as that of Embodiment 1, so it will not be described again here.

[0065] Example 4.

[0066] Reference Figure 10 The main difference between this embodiment and Embodiment 3 lies in the positions of the second pressure ring 132 and the third pressure ring 133. In this embodiment, the first pressure ring 131 is positioned away from the driving cylinder 7, the third pressure ring 133 is positioned close to the driving cylinder 7, and the second pressure ring 132 is located between the first pressure ring 131 and the third pressure ring 133. When the sliding seat 2 abuts against the limiting member 5 near the driving cylinder 7, the working chamber 4 communicates with the first through hole 14. When the sliding seat 2 abuts against the limiting member 5 away from the driving cylinder 7, the working chamber 4 communicates with the third through hole 16. When the positioning pin 18 is inserted into the positioning groove 19, the working chamber 4 communicates with the second through hole 15. The implementation principle of Embodiment 4 is the same as that of Embodiment 1, and therefore will not be repeated here.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressure foot that facilitates stable switching, comprising a base (1) and a sliding seat (2), characterized in that: The sliding seat (2) is slidably fitted to the base (1). The base (1) is provided with a driving component for driving the sliding seat (2) to slide. The base (1) has a through working cavity (4). The sliding seat (2) is provided with three pressure rings (13) distributed along its own sliding direction. Limiting components (5) are provided on both sides of the base (1). The sliding seat (2) is located between the two limiting components (5). When the two ends of the sliding seat (2) abut against the two limiting components (5) respectively, the pressure rings (13) near the two ends of the sliding seat (2) are respectively connected to the working cavity (4). The base (1) is provided with a positioning component for positioning the sliding seat (2). The driving component includes a driving cylinder (7), one end of the piston rod of the driving cylinder (7) has a spherical connecting part (8), one end of the sliding seat (2) is provided with a movable groove (9), the movable groove (9) extends to both sides of the thickness direction of the sliding seat (2), and the spherical connecting part (8) is movably connected in the movable groove (9). The positioning assembly includes a positioning cylinder (17) and a positioning column (18). The positioning cylinder (17) is installed on the base (1), and the positioning column (18) is fixedly installed on the piston rod of the positioning cylinder (17). The positioning cylinder (17) passes through the base (1) and slides with the base (1). When the working chamber (4) is connected to the pressure ring (13) in the middle of the sliding seat (2), one end of the sliding seat (2) abuts against the side of the positioning column (18). The base (1) includes a fixing part (101) and a mounting part (102). The mounting part (102) is integrally connected to the fixing part (101). The mounting part (102) has an arc-shaped sliding groove (3) on the side away from the fixing part (101). The working cavity (4) is connected to the sliding groove (3). The sliding seat (2) is slidably fitted in the sliding groove (3), and the cross sections of the sliding seat (2) and the sliding groove (3) are both T-shaped. The sliding groove (3) extends to both sides of the mounting part (102). Both of the limiting members (5) are fixed to the mounting part (102) by bolts. The driving cylinder (7) is fixed to one of the limiting members (5) by bolts. The limiting member (5) away from the driving cylinder (7) has two stop parts (502). The sliding seat (2) is provided with a sliding indicator part (11) at one end away from the driving cylinder (7). The width of the sliding indicator part (11) is smaller than the distance between the two stop parts (502). The sliding seat (2) has a positioning groove (19) at one end that is inserted into the positioning post (18). When the working cavity (4) is connected to the pressure ring (13) in the middle of the sliding seat (2), the side of the positioning post (18) abuts against the groove wall of the positioning groove (19).

2. The pressure foot for easy and stable switching according to claim 1, characterized in that: The positioning cylinder (17) is fixedly installed on the side of the base (1) away from the sliding seat (2) by bolts, and the positioning column (18) passes through the base (1) along the axial direction of the working cavity (4) and slides with the base (1).

3. The pressure foot for easy and stable switching according to claim 1, characterized in that: The three pressure rings (13) are respectively designated as a first pressure ring (131), a second pressure ring (132), and a third pressure ring (133). The first pressure ring (131) has a first through hole (14) with a diameter between 1 mm and 2 mm. The second pressure ring (132) has a second through hole (15) with a diameter between 2 mm and 3 mm. The third pressure ring (133) has a third through hole (16) with a diameter between 9.5 mm and 10.5 mm.

4. The pressure foot for easy and stable switching according to claim 3, characterized in that: The first pressure ring (131) is located at the free end of the sliding seat (2) near or away from the driving cylinder (7). The first pressure ring (131) has a plurality of air float holes (20) evenly distributed around its own axis. The sliding seat (2) has a vent hole (21) connected to each air float hole (20) at the end near or away from the driving cylinder (7).

5. A pressure foot for easy and stable switching according to claim 1, characterized in that: The sliding seat (2) has three mounting holes (12) distributed along its sliding direction. The three pressure rings (13) are respectively engaged in the three mounting holes (12). Each of the three mounting holes (12) is fitted with an elastic sealing gasket (23) for pressing the pressure ring (13).

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