Electric clamping force sensing pliers

Abstract

The application relates to the technical field of clamping pliers, in particular to electric clamping pliers capable of sensing clamping force of a plier jaw, which comprises a fixed base, two limiting clamping plates are symmetrically arranged at one end of the fixed base, two clamping claws capable of clamping a hoop by rotating are symmetrically arranged at the ends of the two limiting clamping plates away from the fixed base, the clamping claws are fixed with the limiting clamping plates through pin shafts, and a driving mechanism for driving the two clamping claws to rotate and clamp the hoop is fixed on the fixed base; a pressure sensor is embedded in the clamping claw block of each clamping claw, and the pressure sensor is electrically connected with a pressure display. The device can monitor and display the pressure value in the clamping process in real time, so that the operator can accurately master the clamping state, avoid the deviation of the clamping force caused by insufficient experience or subjective judgment error, and significantly improve the consistency and reliability of installation.

Description

Technical Field

[0001] This application relates to the field of clamping pliers technology, and in particular to an electric clamping pliers capable of sensing the clamping force of the jaws. Background Technology

[0002] In pipeline connection engineering, clamps are a commonly used fastener, widely used for connection and sealing in various fluid transportation systems. Their installation quality directly affects the sealing performance and long-term operational reliability of the pipeline system. Currently, clamp installation mostly relies on mechanical clamps for tightening. While traditional clamps are simple in structure and easy to operate, they generally suffer from inaccurate clamping force control. Due to the lack of real-time monitoring methods for the actual clamping force, operators often rely solely on experience to judge the clamping degree, easily leading to insufficient or excessive clamping force. Insufficient clamping force will result in a poor seal between the clamp and the pipeline, causing media leakage; while excessive clamping force may cause local deformation of the clamp or pipeline, or even structural damage, affecting its service life.

[0003] Although some electric or hydraulic calipers on the market attempt to improve the automation of clamping operations, most of these devices still fail to achieve accurate sensing and feedback control of clamping force. While their drive systems can provide stable output torque, the complex contact state between the jaws and the clamping clamp leads to attenuation and deviation in the actual transmission of clamping force, making it difficult to establish a reliable correlation between the output torque and the actual clamping force acting on the clamping clamp. Therefore, developing an installation tool capable of real-time detection and feedback of clamping force is of great significance for improving the consistency, reliability, and safety of clamping clamp installation. Utility Model Content

[0004] This application proposes an electric clamping pliers capable of sensing the clamping force of the jaws in order to solve the above-mentioned problems.

[0005] The technical solution of this application is implemented as follows:

[0006] An electric clamping pliers capable of sensing the clamping force of the jaws includes a fixed base. Two limiting plates are symmetrically mounted on one end of the fixed base. Two clamping jaws, which can rotate relative to each other to clamp a clamping hoop, are symmetrically mounted on the ends of the two limiting plates away from the fixed base. The clamping jaws are fixed to the limiting plates by pins. A drive mechanism for driving the two clamping jaws to rotate and clamp the clamping hoop is fixed on the fixed base. Each clamping jaw includes a set of fixed plates that are installed in conjunction with the pins. A jaw block is detachably connected to the inner side of the ends of the two fixed plates away from the fixed base. The opposing side of the two jaw blocks has jaws formed to match the curvature of the clamping hoop. A pressure sensor is embedded inside the jaw block near the jaws to detect the pressure value that causes the jaw deformation. The pressure sensor is electrically connected to a pressure display.

[0007] Furthermore, limiting grooves matching the ends of the fixing clamp are formed on both sides of the gripper block.

[0008] Furthermore, guide blocks are installed on the inner sides of the two fixed clamping plates in the same group. The guide blocks are located at the end of the fixed clamping plates away from the gripper blocks, and the guide blocks have an arc-shaped portion formed on the side wall near the drive mechanism.

[0009] Furthermore, a limiting groove is formed on the limiting clamp, and the movable end of the driving mechanism is slidably fitted with the limiting groove.

[0010] Furthermore, the driving mechanism includes a lead screw rotatably mounted on the fixed base, a ball sleeve rotatably mounted on the lead screw, a protrusion slidably mounted in the limiting groove on the side wall of the ball sleeve, two rollers rotatably mounted on both sides of the ball sleeve, and the guide block located within the movement path of the rollers.

[0011] Furthermore, a planetary reducer that cooperates with the lead screw drive is installed on the fixed base, and a motor is fixed on the planetary reducer. The power output end of the motor is connected to the power input end of the planetary reducer.

[0012] Furthermore, it also includes a control switch for controlling the forward and reverse rotation of the motor, and the control switch is connected to a power source via a power cord.

[0013] Furthermore, the pressure display has a built-in MCU controller and is electrically connected to the control switch, which facilitates the control of the motor to stop via pressure feedback.

[0014] By adopting the above technical solution, the beneficial effects of this application are as follows:

[0015] 1. This device can monitor and display the pressure value during the clamping process in real time, enabling operators to accurately grasp the clamping status and avoid clamping force deviations caused by insufficient experience or subjective judgment errors, thereby significantly improving the consistency and reliability of installation.

[0016] 2. The jaw blocks adopt a detachable design and the jaw shape is optimized according to the curvature of the clamp, which not only enhances the fit with the clamp and improves the force transmission efficiency, but also makes it easy to replace jaw blocks of different specifications to adapt to the installation needs of various pipe diameters and clamp types, thereby improving the versatility and adaptability of the tool to working conditions.

[0017] 3. The electric clamp has a reasonable structural layout. The drive part adopts a lead screw-ball sleeve transmission with a planetary reducer, which ensures smooth transmission and large output torque. It is suitable for high-intensity and high-frequency industrial applications and has good promotion value and engineering practical significance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the first perspective view of this application;

[0020] Figure 2 This is the second perspective view of this application;

[0021] Figure 3 This is the front view of this application;

[0022] Figure 4 This is a cross-sectional view of this application;

[0023] Figure 5 This is a perspective view of the clamping jaws of this application;

[0024] Figure 6 This is a schematic diagram of the ball sleeve installation in this application;

[0025] Figure 7 This is a circuit structure block diagram of this application.

[0026] The annotations in the attached figures are explained as follows:

[0027] 1. Fixed base; 2. Limiting clamp; 3. Clamping claw; 31. Fixed clamp; 32. Claw block; 33. Jaw; 34. Pressure sensor; 35. Limiting slot; 36. Guide block; 4. Drive mechanism; 41. Planetary reducer; 42. Motor; 43. Lead screw; 44. Ball sleeve; 45. Roller. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] like Figures 1-5As shown, an electric clamping pliers capable of sensing the clamping force of the jaws includes a fixed base 1. Two limiting clamping plates 2 are symmetrically mounted on one end of the fixed base 1 via screws. Two clamping jaws 3, capable of rotating relative to each other and clamping a clamping clamp, are symmetrically mounted on the ends of the two limiting clamping plates 2 away from the fixed base 1. The clamping jaws 3 are fixed to the limiting clamping plates 2 via pins. A drive mechanism 4 is fixed on the fixed base 1 to drive the two clamping jaws 3 to rotate and clamp the clamping clamp. Each clamping jaw 3 includes a set of fixed clamping plates 31 that are mounted in conjunction with pins. The fixed clamping plates 31 are rotatably mounted to the limiting clamping plates 2 via pins. The inner sides of the ends of the two fixed clamping plates 31 away from the fixed base 1 are connected via... The clamping blocks 32 are bolted together. On one side of the two clamping blocks 32 opposite each other, jaws 33 are formed to match the curvature of the pipe clamp. A miniature thin-film pressure sensor 34 is embedded inside the clamping blocks 32 near the jaws 33 to detect the pressure value that causes the jaws 33 to deform. The pressure sensor 34 is electrically connected to a pressure display (not shown in the figure). The miniature thin-film pressure sensor 34 can be a flexible sensor based on the principle of strain gauge or force-sensitive resistor, such as the TEFlexiForce™ series or a miniature sensor with equivalent function. It is tightly attached to the mounting groove on the back of the jaws 33 to ensure the accuracy of pressure sensing.

[0030] As another preferred embodiment of the present invention, the clamping block 32 has limiting grooves 35 formed on both sides that match the ends of the fixing plate 31. By the insertion and engagement of the limiting grooves 35 and the fixing plate 31, the accurate positioning and connection stability of the clamping block 32 during installation can be ensured, avoiding shaking, improving strength, avoiding only the fixing bolts being stressed during use, and facilitating the replacement of clamping blocks 32 of different specifications to adapt to pipe clamps of different sizes.

[0031] As another preferred embodiment of the present invention, guide blocks 36 are installed on the inner side of the two fixed clamping plates 31 in the same group. The guide blocks 36 are located at the end of the fixed clamping plate 31 away from the gripper block 32. The guide blocks 36 have an arc-shaped part formed on the side wall near the drive mechanism 4. The arc-shaped part design can reduce the friction when in contact with the drive mechanism 4, making the opening and closing action of the gripper smoother, and at the same time playing the role of guiding the movement trajectory of the drive mechanism 4.

[0032] In another preferred embodiment of the present invention, a limiting groove 21 is formed on the limiting clamping plate 2, and the movable end of the driving mechanism 4 is slidably fitted with the limiting groove 21. The limiting groove 21 guides and limits the movement of the driving mechanism 4, ensuring the linearity and stability of the clamping force transmission.

[0033] In another preferred embodiment of the present invention, the drive mechanism 4 includes a lead screw 43 rotatably mounted on a fixed base 1, a ball sleeve 44 rotatably mounted on the lead screw 43, a protrusion slidably mounted in a limiting groove 21 on the side wall of the ball sleeve 44, two rollers 45 rotatably mounted on both sides of the ball sleeve 44, and a guide block 36 located in the moving path of the rollers 45. The rollers 45 and the arc portion of the guide block 36 roll into contact, converting the rotational motion of the lead screw 43 into the clamping or releasing action of the clamping claws 3, effectively reducing motion friction and improving transmission efficiency and service life.

[0034] In another preferred embodiment of the present invention, a planetary reducer 41 is mounted on the fixed base 1 and is driven and fitted with the lead screw 43. A DC motor 42 is fixed on the planetary reducer 41. The power output end of the motor 42 is connected to the power input end of the planetary reducer 41. The planetary reducer 41 can provide a large output torque and ensure the smoothness of transmission, which can meet the requirements of force and precision in clamping operation. The DC motor 42 can be a brushed or brushless DC motor with a rated voltage of 12V or 24V. It is integrated with the planetary reducer 41 and provides sufficient output torque to clamp the pipe clamp.

[0035] As another preferred embodiment of the present invention, it also includes a control switch (not shown in the figure) for controlling the forward and reverse rotation of the motor 42. The control switch is connected to a power source via a power cord. The control switch includes a power button, a forward clamping button, and a reverse release button. The control switch is located on the outside of the fixed base 1 in a convenient position for operation and is used to realize manual control of clamping and releasing.

[0036] In another preferred embodiment of the present invention, the pressure display has a built-in MCU controller and a Bluetooth module for data interaction with a mobile APP. The threshold can be set through the mobile APP. The pressure display is electrically connected to the control switch and the control system is electrically connected to the pressure sensor 34 and the motor 42. Closed-loop control of the clamping force can be realized. When the pressure value reaches the set threshold, the MCU can send a signal to control the motor 42 to stop running, thereby realizing precise control of the clamping force and automated management of the installation process. This design effectively prevents over-clamping, protects the clamp and pipe structure from damage, and also helps to extend the service life of the tool itself.

[0037] The working principle of this application is as follows:

[0038] The working principle of this electric clamping pliers is based on the synergistic effect of mechanical transmission and sensor detection. At the start of operation, the jaws 33 of the two gripper blocks 32 are placed outside the clamp. The motor 42 is started by the control switch. The torque output of the motor 42 is reduced and increased by the planetary reducer and then transmitted to the lead screw 43, which drives the lead screw 43 to rotate.

[0039] When the lead screw 43 rotates, the ball sleeve 44 that cooperates with it moves along the axial direction of the lead screw. The protrusion on the side wall of the ball sleeve 44 slides in the groove of the limiting clamp 2, guiding its movement direction. The rollers 45 installed on both sides of the ball sleeve 44 move accordingly and gradually approach the guide block 36 inside the fixed clamp 31. The surface of the guide block 36 is designed to be arc-shaped. After contacting the rollers 45, it converts the axial thrust into a torque that causes the clamping claw 3 to rotate around the pin shaft.

[0040] As the roller 45 continues to push the guide block 36, the two clamping claws 3 rotate towards each other with the pin as the fulcrum, causing the claw block 32 and its jaws 33 to gradually close and clamp the clamp. During the clamping process, the jaws 33 undergo slight elastic deformation due to the force, and the pressure generated by this deformation is transmitted to the pressure sensor 34 embedded inside the claw block 32.

[0041] The pressure sensor 34 detects the magnitude of the deformation pressure in real time and converts it into an electrical signal, which is then transmitted to the pressure display. The display has a built-in MCU controller that processes the signal and displays the real-time pressure value.

[0042] The circuit connections involved in this application are conventional methods used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They belong to widely used prior art.

[0043] Components not described in detail in this article are existing technologies.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric clamping pliers capable of sensing the clamping force of the jaws, comprising a fixed base (1), wherein two limiting clamping plates (2) are symmetrically mounted on one end of the fixed base (1), and two clamping claws (3) capable of rotating and clamping the clamping clamps are symmetrically mounted on the ends of the two limiting clamping plates (2) away from the fixed base (1), wherein the clamping claws (3) are fixed to the limiting clamping plates (2) by pins, characterized in that: The fixed base (1) is fixed with a drive mechanism (4) that drives two clamping claws (3) to rotate and clamp the clamping hoop; each clamping claw (3) includes a set of fixed clamping plates (31) that are installed in conjunction with the pin shaft. The inner side of the two fixed clamping plates (31) away from the fixed base (1) is detachably connected to a claw block (32). The opposite side of the two claw blocks (32) is formed with jaws (33) that match the curvature of the pipe hoop. The inside of the claw block (32) near the jaws (33) is embedded with a pressure sensor (34) that detects the pressure value that causes the jaws (33) to deform. The pressure sensor (34) is electrically connected to a pressure display.

2. The electric clamping pliers capable of sensing the clamping force of the jaws according to claim 1, characterized in that: The gripper block (32) has limiting grooves (35) formed on both sides that match the end of the fixed clamping plate (31).

3. The electric clamping pliers capable of sensing the clamping force of the jaws according to claim 1, characterized in that: Guide blocks (36) are installed on the inner side of the two fixed clamping plates (31) in the same group. The guide blocks (36) are located at the end of the fixed clamping plate (31) away from the gripper block (32). The guide blocks (36) have an arc-shaped part on the side wall near the drive mechanism (4).

4. The electric clamping pliers capable of sensing the clamping force of the jaws according to claim 3, characterized in that: The limiting clamp (2) is formed with a limiting groove (21), and the movable end of the driving mechanism (4) is slidably fitted with the limiting groove (21).

5. An electric clamping pliers capable of sensing the clamping force of the jaws according to claim 4, characterized in that: The drive mechanism (4) includes a lead screw (43) rotatably mounted on the fixed base (1), a ball sleeve (44) rotatably mounted on the lead screw (43), a protrusion formed on the side wall of the ball sleeve (44) and slidably mounted in the limiting groove (21), two rollers (45) rotatably mounted on both sides of the ball sleeve (44), and the guide block (36) is located in the moving path of the rollers (45).

6. The electric clamping pliers capable of sensing the clamping force of the jaws according to claim 5, characterized in that: A planetary reducer (41) is installed on the fixed base (1) and is driven and fitted with the lead screw (43). A motor (42) is fixed on the planetary reducer (41). The power output end of the motor (42) is connected to the power input end of the planetary reducer (41).

7. An electric clamping pliers capable of sensing the clamping force of the jaws according to claim 6, characterized in that: It also includes a control switch for controlling the forward and reverse rotation of the motor (42), and the control switch is connected to a power source via a power line.

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