A real-time monitoring and dynamic compensation device for the clamping force of a vice

Abstract

The present application relates to a kind of vice clamping force real-time monitoring and dynamic compensation device, belong to clamping equipment technical field;Including flexible hinge, double-layer cover plate outer layer, mouthguard, mouthguard fixed bolt, base fixed bolt, columnar piezoelectric ceramic, piezoelectric ceramic pre-tightening bolt, device frame, double-layer cover plate inner layer, vice base and sheet piezoelectric ceramic;Mouthguard is fixed on double-layer cover plate outer layer by mouthguard fixed bolt;Double-layer cover plate outer layer and double-layer cover plate inner layer are respectively connected to device frame by flexible hinge;Device frame rear side is provided with threaded hole, piezoelectric ceramic pre-tightening bolt is fixed between double-layer cover plate inner layer and device frame rear side by above-mentioned threaded hole with columnar piezoelectric ceramic;Device frame is fixed on the rear side top of vice base by base fixed bolt;Sheet piezoelectric ceramic is placed between double-layer cover plate outer layer and double-layer cover plate inner layer;The present application can detect clamping force value in real time, and can be according to the real-time dynamic compensation clamping force of processing state change.

Description

Technical Field

[0001] This invention belongs to the field of clamping equipment technology and relates to a vise clamping force real-time monitoring and dynamic compensation device. Background Technology

[0002] Tooling fixtures are industrial tools used in manufacturing, machining, and assembly processes to fix, position, and hold workpieces in place for precise machining, assembly, and inspection. They play a crucial role in manufacturing, improving production efficiency and ensuring product quality. Among these, the vise is a commonly used tooling fixture for fixing and positioning workpieces to perform various cutting, milling, drilling, boring, and other machining operations.

[0003] During operation, the clamping force of a vise is typically controlled manually, which is insufficient in scenarios requiring precise clamping force control. On one hand, excessive clamping force can cause deformation of thin-walled workpieces or breakage of brittle materials, while insufficient force can lead to workpiece loosening, reduced machining accuracy, or even accidents. On the other hand, during machining, the clamping force undergoes continuous dynamic changes due to cutting forces, vibration, and thermal deformation; excessive fluctuations can also generate the aforementioned risks.

[0004] Existing patents rarely mention similar inventions. One example involving clamping force is Chinese invention patent CN202110266218.1, which discloses a multifunctional clamp with a pressure sensor and its control method. This includes a clamping plate for supporting the workpiece, a force-applying structure for applying clamping force, a pressure sensor for monitoring and measuring the clamping force, and a support structure providing support for the overall clamp. A pressure sensor fixing nut is threaded to the lower end of the force-applying bolt, and the pressure sensor fixing nut is glued to the pressure sensor. The pressure sensor is also glued to a slotted block of a planar bearing, which contains bearing balls. The clamping force is detected by the pressure sensor and adjusted by the force-applying bolt. However, this invention only measures the clamping force and cannot provide real-time compensation for the clamping force during operation. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a vise clamping force real-time monitoring and dynamic compensation device that can detect the clamping force value in real time and dynamically compensate the clamping force in real time according to the changes in the processing state.

[0006] The solution of the present invention is:

[0007] A vise clamping force real-time monitoring and dynamic compensation device includes a flexible hinge, a double-layer cover plate outer layer, a guard plate, guard plate fixing bolts, base fixing bolts, columnar piezoelectric ceramic, piezoelectric ceramic pre-tightening bolts, device frame, double-layer cover plate inner layer, vise base, and sheet-like piezoelectric ceramic.

[0008] The protective plate is fixed to the outer layer of the double-layer cover plate by protective plate fixing bolts; the outer layer and the inner layer of the double-layer cover plate are respectively connected to the device frame by flexible hinges; a threaded hole is provided in the middle of the rear side of the device frame, and the piezoelectric ceramic pre-tightening bolt fixes the columnar piezoelectric ceramic between the inner layer of the double-layer cover plate and the rear side of the device frame through the threaded hole; the device frame is fixed to the top of the rear side of the vise base by base fixing bolts; the sheet-like piezoelectric ceramic is placed between the outer layer and the inner layer of the double-layer cover plate.

[0009] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, a preload is applied by screwing on the piezoelectric ceramic preload bolt. The preload is 10% to 25% of the output force of the columnar piezoelectric ceramic.

[0010] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the columnar piezoelectric ceramic, the outer layer of the double-layer cover plate, the sheet-like piezoelectric ceramic, and the inner layer of the double-layer cover plate are connected in series; thus simultaneously realizing detection and compensation functions.

[0011] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the sheet-like piezoelectric ceramic is used to detect the clamping force; the sheet-like piezoelectric ceramic has a sheet-like structure, which reduces the size of the device.

[0012] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the columnar piezoelectric ceramic compensates for the clamping force; the columnar piezoelectric ceramic is columnar with a small cross-sectional area, enabling high-precision inverse piezoelectric effect control of pressure.

[0013] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the columnar piezoelectric ceramic, the outer layer of the double-layer cover plate, the sheet-like piezoelectric ceramic, and the inner layer of the double-layer cover plate can move freely in the horizontal direction with a small amplitude.

[0014] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the columnar piezoelectric ceramic is placed between the rear end of the outer layer of the double-layer cover plate and the pre-tightening bolt of the piezoelectric ceramic; the outer layer of the inner layer of the double-layer cover plate is provided with two threaded holes, through which the protective plate is connected.

[0015] The aforementioned vise clamping force real-time monitoring and dynamic compensation device also includes an electronic control system; the electronic control system includes a voltage amplifier, an AD acquisition module, a signal generator, and a computer; the electronic control system processes data based on the clamping force on the sheet piezoelectric ceramic to provide compensation pressure for the inner layer of the double-layer cover plate.

[0016] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the sheet-shaped piezoelectric ceramic welded positive and negative leads are connected to a voltage amplifier; the voltage amplifier is connected to an AD acquisition module; the AD acquisition module is connected to a computer; the cylindrical piezoelectric ceramic welded positive and negative leads are connected to the voltage amplifier; and the voltage amplifier is connected to a signal generator.

[0017] In the aforementioned vise clamping force real-time monitoring and dynamic compensation device, the working process of the device is as follows:

[0018] During operation, the sheet-like piezoelectric ceramic generates a piezoelectric effect under clamping force. The voltage signal is amplified by a voltage amplifier and then acquired by an AD acquisition module and transmitted to a computer. The computer uses a signal generator to apply the processed voltage signal to the columnar piezoelectric ceramic. The piezoelectric ceramic generates an inverse piezoelectric effect to provide compensating pressure to the inner layer of the double-layer cover plate, realizing real-time compensation of clamping force.

[0019] The advantages of this invention compared to the prior art are:

[0020] (1) The present invention forms a piezoelectric drive module by combining piezoelectric ceramics, flexible hinges and support frame, which can realize real-time dynamic adjustment of clamping force during cutting process, and form a closed-loop feedback control together with the piezoelectric force measuring module to realize precise control of clamping force during cutting process;

[0021] (2) The present invention uses piezoelectric ceramic drive compensation. Compared with motor drive, piezoelectric drive has high positioning accuracy, small size, fast response speed, no electromagnetic interference, and high load.

[0022] (3) The present invention uses a flexible hinge to replace the guide rail to achieve displacement compensation and guidance, which is small in size and reduces the size and weight of the device;

[0023] (4) The piezoelectric ceramic sensors and other instruments selected in this invention are all conventional instruments required for force measurement experiments, and the cost is low. The modular design makes the overall structure simple and easy to manufacture, assemble, maintain and repair. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the real-time monitoring and dynamic compensation device of the present invention installed on a vise;

[0025] Figure 2 This is a perspective view of the real-time monitoring and dynamic compensation device of the present invention.

[0026] Figure 3 These are top and cross-sectional views of the real-time monitoring and dynamic compensation device of the present invention.

[0027] Figure 4 This is a schematic diagram of the electronic control system of the present invention;

[0028] Figure 5 This is a schematic diagram illustrating the working principle of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments.

[0030] This invention provides a real-time monitoring and dynamic compensation device for vise clamping force, achieving precise control of clamping force during machining through closed-loop feedback control. The piezoelectric drive offers high positioning accuracy, small size, fast response speed, no electromagnetic interference, and high load capacity. The selected components and instruments are all conventional components and instruments required for force measurement experiments, resulting in low cost. The modular design simplifies the structure and facilitates manufacturing, assembly, maintenance, and repair.

[0031] Real-time monitoring and dynamic compensation device for vise clamping force, such as Figures 1-3 Specifically, the device includes a flexible hinge 1, a double-layer cover plate outer layer 2, a guard plate 3, a guard plate fixing bolt 4, a base fixing bolt 5, a columnar piezoelectric ceramic 6, a piezoelectric ceramic preload bolt 7, a device frame 8, a double-layer cover plate inner layer 9, a vise base 10, and a sheet-like piezoelectric ceramic 11. The guard plate 3 is fixed to the double-layer cover plate outer layer 2 by the guard plate fixing bolt 4; the double-layer cover plate outer layer 2 and the double-layer cover plate inner layer 9 are respectively connected to the device frame 8 by the flexible hinge 1; a threaded hole is provided in the middle of the rear side of the device frame 8, and the piezoelectric ceramic preload bolt 7 fixes the columnar piezoelectric ceramic 6 between the double-layer cover plate inner layer 9 and the rear side of the device frame 8 through the threaded hole; the device frame 8 is fixed to the rear top of the vise base 10 by the base fixing bolt 5; the sheet-like piezoelectric ceramic 11 is placed between the double-layer cover plate outer layer 2 and the double-layer cover plate inner layer 9.

[0032] Preload is applied by screwing on the piezoelectric ceramic preload bolt 7. The preload is 10% to 25% of the output of the columnar piezoelectric ceramic 6.

[0033] The columnar piezoelectric ceramic 6, the outer layer of the double-layer cover plate 9, the sheet-like piezoelectric ceramic 11, and the inner layer of the double-layer cover plate 2 are connected in series; simultaneously realizing detection and compensation functions.

[0034] In this invention, the sheet-like piezoelectric ceramic 11 detects the clamping force; the sheet-like structure of the piezoelectric ceramic 11 reduces the size of the device. The columnar piezoelectric ceramic 6 compensates for the clamping force; the columnar piezoelectric ceramic 6 is columnar with a small cross-sectional area, enabling high-precision pressure control via the inverse piezoelectric effect.

[0035] The columnar piezoelectric ceramic 6, the outer layer of the double-layer cover plate 9, the sheet-like piezoelectric ceramic 11, and the inner layer of the double-layer cover plate 2 can move freely in a small range in the horizontal direction.

[0036] The columnar piezoelectric ceramic 6 is placed between the rear end of the outer layer 9 of the double-layer cover plate and the pre-tightening bolt 7 of the piezoelectric ceramic; the outer layer of the inner layer 2 of the double-layer cover plate is provided with two threaded holes, and the protective plate 3 is connected through the two threaded holes.

[0037] like Figure 4 As shown, the real-time holding force monitoring and dynamic compensation device also includes an electronic control system; the electronic control system includes a voltage amplifier, an AD acquisition module, a signal generator, and a computer; the electronic control system processes data based on the clamping force on the sheet piezoelectric ceramic 11 to provide compensation pressure for the inner layer 9 of the double-layer cover plate. The sheet piezoelectric ceramic 11 is connected to the voltage amplifier by welding positive and negative wires; the voltage amplifier is connected to the AD acquisition module; the AD acquisition module is connected to the computer; the cylindrical piezoelectric ceramic 6 is connected to the voltage amplifier by welding positive and negative wires; the voltage amplifier is connected to the signal generator.

[0038] like Figure 5 As shown, the working process of the real-time force monitoring and dynamic compensation device is as follows:

[0039] During operation, the sheet-like piezoelectric ceramic 11 generates a piezoelectric effect under the action of clamping force. The voltage signal is amplified by a voltage amplifier and the amplified voltage signal is acquired by an AD acquisition module and transmitted to a computer. The computer uses a signal generator to apply the processed voltage signal to the columnar piezoelectric ceramic 6. The piezoelectric ceramic generates an inverse piezoelectric effect to provide compensation pressure for the inner layer 9 of the double-layer cover plate, realizing real-time compensation of clamping force.

[0040] To address the issue that manual operation of vises cannot meet the requirements in scenarios with high clamping force control, this invention provides a device that can detect clamping force values ​​in real time and dynamically compensate for clamping force based on changes in processing status.

[0041] To address the aforementioned problems, this invention designs a vise clamping force real-time monitoring and dynamic compensation device consisting of three parts, including:

[0042] A piezoelectric force measurement module used to detect changes in clamping force in real time;

[0043] A piezoelectric drive clamping force compensation module for real-time compensation of clamping force;

[0044] An electronic control system used to achieve closed-loop feedback for clamping force detection and compensation.

[0045] The force measuring and compensation device is installed between the end guard plate and the base and is fixed by bolts.

[0046] As an improvement to this invention, the force measuring module consists of a piezoelectric ceramic sheet and four flexible hinges. The sheet-shaped piezoelectric ceramic is placed within the gap of the double-layered top cover at the front of the device. The double-layered top cover is connected to the device frame by the four flexible hinges, and the device frame is bolted to the vise base. The piezoelectric ceramic is sheet-shaped to reduce the size of the device. The four flexible hinges ensure that the force measuring and compensation device can move freely in the horizontal direction with a small range.

[0047] As an improvement of the present invention, the piezoelectric drive clamping force compensation module consists of a columnar piezoelectric ceramic and a pre-tightening bolt. The columnar piezoelectric ceramic is placed between the rear end of the double-layer top cover and the pre-tightening bolt, and the pre-tightening bolt passes through the threaded hole in the middle of the rear end of the device and presses against the rear end of the columnar piezoelectric ceramic. The outer layer of the front double-layer top cover has two threaded holes for connecting the protective plate. Compared with the motor drive method, the piezoelectric drive has high positioning accuracy, small size, fast response speed, no electromagnetic interference, and high load capacity.

[0048] As an improvement of this invention, the sheet-shaped piezoelectric ceramic is connected to a voltage amplifier via welded positive and negative wires. The amplifier is connected to an AD acquisition module, which is then connected to a computer. Similarly, the cylindrical piezoelectric ceramic is connected to a voltage amplifier via welded positive and negative wires. The voltage amplifier is connected to a signal generator. During operation, the sheet-shaped piezoelectric ceramic generates a piezoelectric effect under clamping force. The voltage signal is amplified by the voltage amplifier, and the amplified voltage signal is acquired by the AD acquisition module and transmitted to the computer. The computer uses the signal generator to apply the processed voltage signal to the cylindrical piezoelectric ceramic. The piezoelectric ceramic then generates an inverse piezoelectric effect, creating compensating pressure on the inner layer of the double-layer cover plate, thus achieving real-time compensation of the clamping force.

[0049] This invention combines piezoelectric ceramics, flexible hinges, and a support frame to form a piezoelectric drive module, which can realize real-time dynamic adjustment of clamping force during cutting. Together with the piezoelectric force measurement module, it forms a closed-loop feedback control to achieve precise control of clamping force during cutting. At the same time, it uses piezoelectric ceramic drive compensation. Compared with motor drive, piezoelectric drive has high positioning accuracy, small size, fast response speed, no electromagnetic interference, and high load capacity.

[0050] This invention uses flexible hinges instead of guide rails to achieve displacement compensation and guidance, resulting in a smaller size and reduced device volume and weight. The piezoelectric ceramic sensors and other instruments selected for this invention are all conventional instruments required for force measurement experiments, thus having low cost. The modular design results in a simple overall structure, facilitating manufacturing, assembly, maintenance, and repair.

[0051] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A vise clamping force real-time monitoring and dynamic compensation device, characterized in that: Includes a flexible hinge (1), an outer layer of a double-layer cover plate (9), a protective plate (3), a protective plate fixing bolt (4), a base fixing bolt (5), a columnar piezoelectric ceramic (6), a piezoelectric ceramic pre-tightening bolt (7), a device frame (8), an inner layer of a double-layer cover plate (2), a vise base (10), and a sheet piezoelectric ceramic (11). Among them, the mouth plate (3) is fixed to the outer layer (9) of the double cover plate by the mouth plate fixing bolt (4); the outer layer (9) of the double cover plate and the inner layer (2) of the double cover plate are respectively connected to the device frame (8) by the flexible hinge (1); a threaded hole is provided in the middle of the rear side of the device frame (8), and the piezoelectric ceramic pre-tightening bolt (7) fixes the columnar piezoelectric ceramic (6) between the inner layer (2) of the double cover plate and the rear side of the device frame (8) through the threaded hole; the device frame (8) is fixed to the rear top of the vise base (10) by the base fixing bolt (5); the sheet piezoelectric ceramic (11) is placed between the outer layer (9) of the double cover plate and the inner layer (2) of the double cover plate.

2. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: Preload is applied by screwing the piezoelectric ceramic preload bolt (7), and the preload is 10% to 25% of the output of the columnar piezoelectric ceramic (6).

3. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The columnar piezoelectric ceramic (6), the outer layer of the double-layer cover plate (9), the sheet piezoelectric ceramic (11), and the inner layer of the double-layer cover plate (2) are connected in series; thus realizing both detection and compensation functions.

4. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The sheet-like piezoelectric ceramic (11) is used to detect the clamping force; the sheet-like piezoelectric ceramic (11) has a sheet-like structure, which reduces the size of the device.

5. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The columnar piezoelectric ceramic (6) compensates for the clamping force; the columnar piezoelectric ceramic (6) is columnar with a small cross-sectional area, which enables high-precision inverse piezoelectric effect control of pressure.

6. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The columnar piezoelectric ceramic (6), the outer layer of the double-layer cover plate (9), the sheet piezoelectric ceramic (11), and the inner layer of the double-layer cover plate (2) can move freely in the horizontal direction with a small amplitude.

7. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The columnar piezoelectric ceramic (6) is placed between the rear end of the outer layer (9) of the double-layer cover plate and the piezoelectric ceramic pre-tightening bolt (7); the outer layer of the inner layer (2) of the double-layer cover plate is provided with two threaded holes, and the protective plate (3) is connected through the two threaded holes.

8. The vise clamping force real-time monitoring and dynamic compensation device according to claim 1, characterized in that: The clamping force real-time monitoring and dynamic compensation device also includes an electrical control system; the electrical control system includes a voltage amplifier, an AD acquisition module, a signal generator and a computer; the electrical control system realizes data processing based on the clamping force of the sheet piezoelectric ceramic (11) to provide compensation pressure for the inner layer (2) of the double cover plate.

9. The vise clamping force real-time monitoring and dynamic compensation device according to claim 8, characterized in that: The sheet-shaped piezoelectric ceramic (11) is welded with positive and negative wires and connected to a voltage amplifier; the voltage amplifier is connected to an AD acquisition module; the AD acquisition module is connected to a computer; the columnar piezoelectric ceramic (6) is welded with positive and negative wires and connected to a voltage amplifier; the voltage amplifier is connected to a signal generator.

10. A vise clamping force real-time monitoring and dynamic compensation device according to claim 9, characterized in that: The working process of the clamping force real-time monitoring and dynamic compensation device is as follows: During operation, the sheet piezoelectric ceramic (11) generates a piezoelectric effect under the action of clamping force. The voltage signal is amplified by a voltage amplifier and the amplified voltage signal is collected by an AD acquisition module and transmitted to a computer. The computer uses a signal generator to apply the processed voltage signal to the columnar piezoelectric ceramic (6). The columnar piezoelectric ceramic (6) generates an inverse piezoelectric effect to provide compensation pressure for the inner layer (2) of the double-layer cover plate, realizing real-time compensation of clamping force.

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