Multi-specification connector welding equipment capable of adjusting pin positioning clamp

Abstract

The invention relates to the technical field of connector pin welding, and discloses multi-specification connector welding equipment capable of adjusting a pin positioning clamp, the multi-specification connector welding equipment comprises a supporting table, a lifting table is slidably connected to the upper end of the supporting table, and clamping seats are symmetrically slidably connected to the lifting table; the lower end of the lifting table is connected with a linkage part for driving the two clamping seats to approach synchronously, the two clamping seats are connected with an isolation part for preventing soldering tin from overflowing, and the isolation part comprises a moving plate. The multi-specification connector welding equipment capable of adjusting the pin positioning clamp can effectively solve the problems that in the prior art, in the welding process, if pressing force is too large, a bonding pad on a circuit board is likely to deform, tilt and even be separated from a substrate, and due to the fact that soldering paste is too large, a temperature curve is unreasonable, a Pin coating is poor or the bonding pad is improperly designed, the bonding pad is prone to deformation, upwarp and even be separated from the substrate. And fused soldering tin is easy to connect adjacent pins to cause short circuit, which may cause equipment failure or burning of components.

Description

Technical Field

[0001] This invention relates to the field of connector pin soldering technology, and more specifically to a multi-specification connector soldering equipment with an adjustable pin positioning fixture. Background Technology

[0002] As the core interface of electronic devices, connectors' pins are the key carriers of signal and current transmission, directly determining the stability and reliability of the connection. Soldering is the mainstream process for connecting pins to PCB pads, mainly including three key steps: 1. Pre-treatment, which involves targeted treatment of the pin surface and PCB pads to ensure good solder wetting properties; 2. Solder application, which is usually completed by solder paste printing or spot soldering; 3. Heating and curing, which typically uses reflow soldering or wave soldering processes to form a reliable solder joint structure.

[0003] The following defects are prone to occur during the soldering process: First, if the pressure is too high during the soldering process, the pads on the circuit board may deform, lift, or even detach from the substrate, losing their soldering connection function; Second, in high-density layout scenarios, if there are problems such as excessive solder paste, unreasonable temperature profile parameters, poor pin plating quality, or improper pad design, the molten solder may easily overflow onto adjacent pins, causing short circuits, which may lead to equipment failure or component burnout. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a multi-specification connector welding device with an adjustable pin positioning fixture. This device effectively solves the problems in existing technologies where excessive pressure during welding can cause the solder pads on the circuit board to deform, lift, or even detach from the substrate. It also addresses the issues where excessive solder paste, unreasonable temperature profiles, poor pin plating, or improper pad design can cause molten solder to connect adjacent pins, leading to short circuits and potentially causing equipment malfunctions or component burnout.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a multi-specification connector welding device with an adjustable pin positioning clamp, comprising:

[0007] A support platform, with a lifting platform slidably connected to the upper end of the support platform, and clamping seats symmetrically slidably connected to the lifting platform. A linkage part is connected to the lower end of the lifting platform to drive the two clamping seats to move closer synchronously, and an isolation part is connected to the two clamping seats to prevent solder overflow.

[0008] The isolation section includes a sliding plate, and two clamping seats are symmetrically and slidably connected to each other via a connector. A rotating plate is connected to the connector at a position between the two sliding plates.

[0009] The front and rear end faces of the rotating plate are evenly provided with semicircular grooves corresponding to pins along the length direction, and the end of the moving plate near the rotating plate is evenly provided with semicircular grooves corresponding to semicircular grooves. The corresponding semicircular grooves are spliced ​​together to form a circular groove.

[0010] The rotating plate is equipped with an adjustment mechanism to prevent damage to the connector caused by excessive pressure on the soldering head.

[0011] Furthermore, the connector includes a mounting base, which is symmetrically and fixedly connected to the upper end of the clamping base. A round rod is slidably connected between the two mounting bases, and the round rod is fixedly connected to the clamping base by a support spring. The two sliding plates are symmetrically and slidably connected to the two round rods.

[0012] Furthermore, a cylindrical block is fixedly connected to the round rod, and an arc-shaped guide groove is formed on the contact surface of the moving plate with the round rod.

[0013] Furthermore, a push plate is fixedly connected to the lower end face of the moving plate.

[0014] Furthermore, the rotating plate is fixedly connected to the left round rod, and a magnetic sleeve is fixedly sleeved on the right round rod. A magnetic block that is magnetically attracted to the magnetic sleeve is fixedly connected to the right end of the rotating plate.

[0015] Furthermore, the linkage includes a connecting seat, which is rotatably connected to the lower end of the lifting platform via a torsion spring, and the connecting seat is hinged to the two clamping seats respectively via hinge plates.

[0016] Furthermore, the adjusting component includes a miniature cylinder, the lower end of the support platform is fixedly connected to the miniature cylinder, the piston rod of the miniature cylinder passes through the support platform and is rotatably connected to the connecting seat, the lower end face of the rotating plate is fixedly connected to a pressure sensor, and the upper end face of the clamping seat is fixedly connected to an elastic silicone pad.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] 1. In this invention, the operator only needs to rotate the rotating plate to close it, which will then drive the two moving plates to move synchronously towards each other via the connecting parts. On one hand, the push plate pushes the component to calibrate its position; on the other hand, the semi-circular groove two of the moving plate and the semi-circular groove one of the rotating plate precisely align to form a circular groove, which wraps around each pin. The soldering head is aligned with the circular groove to pour solder. The molten solder flows smoothly within the circular groove and fills the gaps, then solidifies after cooling. The circular groove can constrain the solder flow, preventing it from overflowing to adjacent pins and reducing short circuits and PCB board contamination.

[0019] 2. In this invention, after the rotating plate is closed, its lower pressure sensor contacts the upper elastic silicone pad of the clamping seat and sets a pressure reference threshold. During welding, if the pressure of the welding head exceeds the threshold, the pressure sensor immediately sends a signal to the control system. The control system controls the micro cylinder at the lower end of the support platform to release air, and the piston rod retracts to drive the connecting seat and the lifting platform to move downward, so that the component is away from the welding head. The displacement compensates for the pressure and prevents the pins from bending, the PCB board from deforming, or the solder pads from falling off. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the PCB board and connector assembly, which are the objects of this invention.

[0022] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the separation structure according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the moving plate and the rotating plate according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the separation structure of the lifting platform, the linkage part, and the isolation part according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the separation structure of the clamping seat and the moving plate in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the state transition of the isolation section in an embodiment of the present invention.

[0028] The labels in the diagram represent: 1. Support platform; 2. Lifting platform; 3. Clamping seat; 4. Linkage part; 41. Connecting seat; 42. Torsion spring; 43. Hinge plate; 5. Isolation part; 51. Moving plate; 511. Arc-shaped guide groove; 512. Push plate; 52. Connector; 521. Mounting seat; 522. Round rod; 5221. Columnar block; 523. Support spring; 524. Magnetic sleeve; 525. Magnetic block; 53. Rotating plate; 531. Semicircular groove one; 532. Semicircular groove two; 54. Adjusting part; 541. Miniature cylinder; 542. Pressure sensor; 543. Elastic silicone pad. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to embodiments.

[0031] Example:

[0032] Please see Figures 1-7 This invention provides a technical solution: a multi-specification connector welding device with an adjustable pin positioning clamp, comprising:

[0033] Support platform 1, with a lifting platform 2 slidably connected to the upper end of the support platform 1, and clamping seats 3 symmetrically slidably connected to the lifting platform 2. The lower end of the lifting platform 2 is connected to a linkage part 4 that drives the two clamping seats 3 to approach synchronously, and an isolation part 5 that prevents solder overflow is connected to the two clamping seats 3.

[0034] The isolation section 5 includes a sliding plate 51. The two clamping seats 3 are symmetrically connected to the sliding plates 51 by a connector 52. A rotating plate 53 is connected to the connector 52 at a position between the two sliding plates 51.

[0035] The front and rear end faces of the rotating plate 53 are evenly provided with semi-circular groove 1 531 corresponding to the pin along the length direction, and the end of the moving plate 51 near the rotating plate 53 is evenly provided with semi-circular groove 2 532 corresponding to the semi-circular groove 1 531. The corresponding semi-circular groove 1 531 and semi-circular groove 2 532 are joined together to form a circular groove.

[0036] The rotating plate 53 is equipped with an adjustment element 54 to prevent the connector from being damaged by excessive pressure on the welding head.

[0037] It is worth noting that both the transfer board 51 and the transfer board 53 are edged with ceramic material, which has the characteristics of extremely low solder wettability, preventing solder from adhering, and extremely high temperature resistance, fully withstanding various high-temperature welding processes. At the same time, it has high mechanical hardness, good wear resistance, and strong chemical inertness, and does not react with flux or solder.

[0038] Specifically, before the formal soldering operation, the connector pins are first inserted into the corresponding solder holes on the PCB board pads to complete the pre-assembly.

[0039] In the initial state, the rotating plate 53 is in the open position, and the two moving plates 51 are kept far apart from each other. The operator places the pre-assembled PCB board and connector assembly along the space between the two moving plates 51 at the designated position of the lifting platform 2.

[0040] Subsequently, the rotating plate 53 is rotated to cover the moving plate 51. During this process, the rotating plate 53 drives the two moving plates 51 to move synchronously towards each other through the connector 52: on the one hand, the movement of the moving plate 51 can accurately calibrate the position of the PCB board and the connector assembly on the lifting platform 2 to ensure the stable correspondence between the pins and the solder holes; on the other hand, as the moving plate 51 and the rotating plate 53 are connected, the semi-circular groove 1 531 and the semi-circular groove 2 532 are precisely spliced ​​to form a circular groove, which wraps and positions the pins of the connector one by one.

[0041] After positioning, the welding head of the welding equipment aligns with each circular groove from top to bottom to perform soldering. The molten solder is injected into the circular groove and automatically flows and levels within it, fully filling the gap between the pin and the solder hole. It then solidifies during natural cooling, achieving a reliable connection between the pin and the PCB board. This avoids the overflow problem caused by inaccurate positioning or excessive solder flow in conventional soldering, reducing solder waste and the risk of short circuits between adjacent pins and contamination of the PCB board surface.

[0042] During the soldering process, if the downward pressure of the soldering head exceeds the preset safety value, the adjustment component 54 on the rotating plate 53 will be triggered immediately, driving the lifting platform 2 to move the PCB board and connector assembly downward synchronously. By adjusting the relative position, the pressure of the soldering head is reduced, and the pressure is buffered by displacement compensation. This avoids damage such as connector pin bending, PCB board deformation, or pad detachment caused by improper pressure control in conventional soldering, and reduces the workpiece loss rate.

[0043] From the overall process perspective, the entire process, from workpiece placement and positioning calibration to welding protection, is automated and linked through mechanical structures. The operation steps are standardized, and operators do not need to have superb welding skills. This not only ensures the stability of welding quality but also greatly improves the continuity of operations. It solves the problems of non-standardized soldering processes, large quality fluctuations, and low efficiency, and is especially suitable for mass production scenarios.

[0044] The connector 52 includes a mounting base 521, which is symmetrically fixedly connected to the upper end of the clamping base 3. A round rod 522 is slidably connected between the two mounting bases 521. The round rod 522 is fixedly connected to the clamping base 3 by a support spring 523. The two sliding plates 51 are symmetrically slidably connected to the two round rods 522.

[0045] A cylindrical block 5221 is fixedly connected to the round rod 522. An arc-shaped guide groove 511 is provided on the contact surface of the moving plate 51 with the round rod 522. A push plate 512 is fixedly connected to the lower end face of the moving plate 51.

[0046] The rotating plate 53 is fixedly connected to the left round rod 522, and a magnetic sleeve 524 is fixedly sleeved on the right round rod 522. A magnetic block 525 that is magnetically attracted to the magnetic sleeve 524 is fixedly connected to the right end of the rotating plate 53.

[0047] Specifically, when the PCB board and connector are not placed, the turntable 53 is in the open state, and the two moving plates 51 are kept apart from each other by the cooperation of the arc-shaped guide groove 511 and the cylindrical block 5221, thus reserving sufficient space for the placement of the PCB board and connector.

[0048] After the operator places the pre-assembled PCB board and connector assembly in the designated area of ​​the lifting platform 2, the operator manually closes the rotating plate 53, so that the magnetic block 525 on the right end of the rotating plate 53 is precisely attracted to the magnetic sleeve 524 on the right round rod 522, thus achieving stable fixation of the rotating plate 53. During the rotation process of the rotating plate 53 closing, since the rotating plate 53 is fixedly connected to the left round rod 522, it will drive the left round rod 522 to rotate synchronously. The cylindrical block 5221 on the left round rod 522 slides in the arc-shaped guide groove 511 of the corresponding moving plate 51. At the same time, through the attraction of the magnetic block 525 and the magnetic sleeve 524, the right round rod 522 also rotates synchronously with the rotating plate 53, and its outer cylindrical block 5221 also slides in the arc-shaped guide groove 511 of the corresponding moving plate 51.

[0049] Under the combined action of the cylindrical block 5221 and the arc-shaped guide groove 511, the two moving plates 51 move synchronously towards each other along the axis of the round rod 522. On the one hand, the push plate 512 at the lower end of the moving plate 51 applies a pushing force to the edge of the PCB board, pushing the PCB board to adjust its position on the lifting platform 2 until the PCB board and the connector are in the center. On the other hand, as the moving plate 51 approaches, the semi-circular groove 532 on the moving plate 51 and the semi-circular groove 531 on the rotating plate 53 precisely align, and together they form a circular groove, which wraps around the edges of each pin of the connector, providing constraints for subsequent soldering operations and preventing solder flow from causing pin short circuits or pad contamination.

[0050] The core advantage of this connector 52 structure lies in its highly integrated and convenient operation. The operator only needs to perform a simple manual action—closing the rotating plate 53—to simultaneously complete three key tasks through a series of mechanical transmission and positioning mechanisms, including the linkage between the rotating plate 53 and the round rod 522, the engagement of the cylindrical block 5221 and the arc-shaped guide groove 511, and the fixation of the magnetic block 525 and the magnetic sleeve 524.

[0051] First, the push plate 512 pushes the PCB board and connector to achieve center positioning, ensuring the workpiece position accuracy. Second, the drive plate 51 and the rotating plate 53 dock to form a circular groove, completing the encapsulation and isolation of the pins. Third, the magnetic block 525 and the magnetic sleeve 524 attract each other to achieve stable fixation of the rotating plate 53 and the mover plate 51. This design greatly simplifies the operation process, reduces manual intervention steps, lowers the skill threshold for operators, avoids positioning errors that may be caused by multi-step operations, and significantly improves the operating efficiency and positioning accuracy of the equipment.

[0052] The linkage 4 includes a connecting seat 41, which is rotatably connected to the lower end of the lifting platform 2 via a torsion spring 42. The connecting seat 41 is hinged to the two clamping seats 3 via hinge plates 43.

[0053] The adjusting component 54 includes a miniature cylinder 541. The lower end of the support platform 1 is fixedly connected to the miniature cylinder 541. The piston rod of the miniature cylinder 541 passes through the support platform 1 and is rotatably connected to the connecting seat 41. The lower end face of the rotating plate 53 is fixedly connected to a pressure sensor 542. The upper end face of the clamping seat 3 is fixedly connected to an elastic silicone pad 543.

[0054] Specifically, in the initial state of the equipment, the torsion spring 42 is in a natural deformation state, and its elastic force drives the connecting seat 41 to maintain a specific rotation angle. The connecting seat 41 applies opposing pulling forces to the two clamping seats 3 through the hinge plates 43 on both sides, so that the two clamping seats 3 always have a tendency to move closer to each other. When the operator places the pre-assembled PCB board and connector assembly between the two moving plates 51, the two clamping seats 3 automatically move towards the middle under the driving force of the torsion spring 42, flexibly clamping the left and right ends of the PCB board and connector, and initially fixing the position of the workpiece.

[0055] Subsequently, the operator closes the rotating plate 53 and fixes it in place by the magnetic attraction between the magnetic block 525 and the magnetic sleeve 524. At this time, the pressure sensor 542 on the lower end face of the rotating plate 53 is in contact with the elastic silicone pad 543 on the upper end face of the clamping seat 3. The pressure sensor 542 detects the initial pressure value and sets it as the reference threshold. After the soldering operation begins, the soldering head extends from top to bottom into the circular groove formed by the combination of semicircular groove one 531 and semicircular groove two 532, and presses it on the connection between the PCB board and the pin to apply solder.

[0056] If the downward pressure of the welding head is too high due to improper operation, the pressure value detected by the pressure sensor 542 will exceed the preset reference threshold. At this time, the pressure sensor 542 will immediately send a signal to the control system. After receiving the signal, the control system will control the micro cylinder 541 to automatically release the air. The piston rod of the micro cylinder 541 will retract accordingly, driving the connector 41 and the lifting platform 2 connected to it to move downward synchronously. This will move the PCB board and connector assembly away from the welding head, effectively buffering the excessive pressure and avoiding damage such as connector pin bending, PCB board deformation or solder pad detachment caused by excessive pressing.

[0057] It is worth noting that the aforementioned multi-specification connector soldering equipment with adjustable pin positioning fixtures also has the following advantages:

[0058] Advantage 1: In this embodiment, the operator only needs to rotate the rotating plate 53 to close it, and the two moving plates 51 can be moved synchronously towards each other through the connector 52. On the one hand, the push plate 512 pushes the component to calibrate the position, and on the other hand, the semi-circular groove 532 of the moving plate 51 and the semi-circular groove 531 of the rotating plate 53 are precisely spliced ​​to form a circular groove, which wraps the pins one by one. The soldering head is aligned with the circular groove to pour solder. The molten solder flows level in the circular groove and fills the gap. After cooling, it solidifies. The circular groove can constrain the flow of solder and prevent it from overflowing to adjacent pins, reducing short circuits and PCB board contamination problems.

[0059] Advantage 2: In this embodiment, after the rotating plate 53 is closed, its lower pressure sensor 542 contacts the upper elastic silicone pad 543 of the clamping seat 3 to set a pressure reference threshold. During welding, if the pressure of the welding head exceeds the threshold, the pressure sensor 542 immediately sends a signal to the control system. The control system controls the micro cylinder 541 at the lower end of the support platform 1 to release air. The piston rod retracts and drives the connecting seat 41 and the lifting platform 2 to move downward, so that the component is away from the welding head. The displacement compensates for the pressure and prevents the pins from bending, the PCB board from deforming, or the solder pads from falling off.

[0060] Thirdly, when no components are placed, the rotating plate 53 is open and the moving plate 51 is separated. After the components are placed, the rotating plate 53 only needs to be manually closed. The magnetic block 525 on the right end of the rotating plate 53 is attracted to the magnetic sleeve 524 of the right round rod 522 to fix it. During the closing process, the rotating plate 53 drives the left and right round rods 522 to rotate. The cylindrical block 5221 on the round rod 522 slides in the arc-shaped guide groove 511 of the moving plate 51, driving the moving plate 51 to move towards each other. Three operations are completed simultaneously: the push plate 512 calibrates the position of the components, the semi-circular groove is used to assemble the positioning pins, and the magnetic structure fixes the rotating plate 53 and the moving plate 51. There is no need for multiple manual adjustments, which simplifies the operation process, reduces manual intervention, and improves the continuity and efficiency of the operation.

[0061] Fourthly, in the initial state, the lower connecting seat 41 of the lifting platform 2 maintains a specific angle under the action of the torsion spring 42. The hinge plate 43 applies a pulling force to the two clamping seats 3 in opposite directions, causing the clamping seats 3 to tend to move closer. After the installed component is placed in, the clamping seats 3 automatically move closer under the driving force of the torsion spring 42, flexibly clamping the left and right ends of the component and initially fixing the position. During the subsequent movement of the moving plate 51, the push plate 512 further pushes the component to the center. Combined with the precise wrapping of the pins by the circular groove, the double positioning ensures the stability of the component position during the welding process and avoids the welding quality being affected by positioning deviation.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-specification connector welding device with an adjustable pin positioning clamp, characterized in that, include: A support platform (1) is provided, and a lifting platform (2) is slidably connected to the upper end of the support platform (1). Clamping seats (3) are symmetrically slidably connected to the lifting platform (2). A linkage part (4) is connected to the lower end of the lifting platform (2) to drive the two clamping seats (3) to approach each other synchronously. An isolation part (5) is connected to the two clamping seats (3) to prevent solder overflow. The isolation section (5) includes a sliding plate (51), and the two clamping seats (3) are symmetrically connected to the sliding plates (51) through a connector (52). The connector (52) is connected to a rotating plate (53) at a position between the two sliding plates (51). The front and rear end faces of the rotating plate (53) are evenly provided with semicircular groove 1 (531) corresponding to the pin along the length direction. The end of the moving plate (51) near the rotating plate (53) is evenly provided with semicircular groove 2 (532) corresponding to semicircular groove 1 (531). The corresponding semicircular groove 1 (531) and semicircular groove 2 (532) are joined together to form a circular groove. The rotating plate (53) is connected to an adjustment element (54) to prevent the connector from being damaged by excessive pressure on the soldering head.

2. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 1, characterized in that: The connector (52) includes a mounting base (521), which is symmetrically fixedly connected to the upper end of the clamping base (3). A round rod (522) is slidably connected between the two mounting bases (521) and slides up and down. The round rod (522) is fixedly connected to the clamping base (3) by a support spring (523). The two sliding plates (51) are symmetrically slidably connected to the two round rods (522).

3. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 2, characterized in that: A cylindrical block (5221) is fixedly connected to the round rod (522), and an arc-shaped guide groove (511) is provided on the contact surface of the moving plate (51) with the round rod (522).

4. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 1, characterized in that: A push plate (512) is fixedly connected to the lower end face of the moving plate (51).

5. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 2, characterized in that: The rotating plate (53) is fixedly connected to the left round rod (522), and a magnetic sleeve (524) is fixedly sleeved on the right round rod (522). A magnetic block (525) that is magnetically attracted to the magnetic sleeve (524) is fixedly connected to the right end of the rotating plate (53).

6. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 1, characterized in that: The linkage (4) includes a connecting seat (41), which is rotatably connected to the lower end of the lifting platform (2) by a torsion spring (42). The connecting seat (41) is hinged to the two clamping seats (3) respectively by a hinge plate (43).

7. The multi-specification connector welding equipment with an adjustable pin positioning fixture according to claim 1, characterized in that: The adjusting component (54) includes a miniature cylinder (541). The lower end of the support platform (1) is fixedly connected to the miniature cylinder (541). The piston rod of the miniature cylinder (541) passes through the support platform (1) and is rotatably connected to the connecting seat (41). The lower end face of the rotating plate (53) is fixedly connected to a pressure sensor (542). The upper end face of the clamping seat (3) is fixedly connected to an elastic silicone pad (543).

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