Pressing plate with pressure detection function

Abstract

The utility model relates to the technical field of machining, and discloses a pressing plate with a pressure detection function. The device comprises a pressing plate, one end of the pressing plate is provided with a pressure sensor which can accurately measure the stress pressure of the pressing plate, the installation position is flexible, and the pressure sensor can be arranged on the contact side of the pressing plate and an ejector rod or a workpiece. An electric control box is further arranged, electrically connected with the pressure sensor and externally connected with a display device to display pressure readings in real time. The pressing plate is matched with an electric, pneumatic and hydraulic motor-driven L-shaped mold pressing device. During working, the driving mechanism drives the transmission part and the pressing plate to apply pressure, the pressure sensor quickly senses the pressure, converts the pressure into an electric signal and transmits the electric signal to the electric cabinet, and the pressure is displayed in real time after processing. The problems that the pressure of an existing pressing die is difficult to control and cannot be monitored in real time are solved, the method is suitable for the fields of die, part and plate machining and the like, the rejection rate can be reduced, efficiency can be improved, and industrial intelligent high-quality development is assisted.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and manufacturing technology, and more specifically, to a pressure plate with pressure detection. Background Technology

[0002] In modern industrial production, especially in mold processing and parts forming, compression molding is a crucial step. As the core equipment for this process, the performance of the compression molding machine directly affects product quality and production efficiency.

[0003] Traditional molding presses have several significant drawbacks in practical applications. Firstly, most molding presses focus solely on applying mechanical pressure to the workpiece, lacking precise monitoring methods for the actual stress on the pressure plate during the pressing process. Operators can only rely on experience and rough estimations to judge whether the pressure is appropriate, making it difficult to accurately control the pressure level. This easily leads to poor molding due to insufficient pressure, such as loose component connections or unclear mold patterns, or workpiece damage and mold deformation due to excessive pressure, significantly increasing the scrap rate and production costs.

[0004] On the other hand, with the accelerated advancement of industrial automation, the demand for precise control and data-driven management of production processes is becoming increasingly urgent. Traditional compression molding machines cannot provide real-time pressure data feedback, making it difficult to integrate into intelligent production control systems. They cannot meet the requirements of modern factories for real-time monitoring and precise adjustment of production processes, thus limiting the overall optimization and upgrading of production processes.

[0005] Furthermore, while different types of mold presses, such as electric, pneumatic, and hydraulic mold presses, each have their own advantages, they all have shortcomings in coordinating with pressure monitoring systems. Due to the lack of suitable pressure detection devices, their flexibility is greatly reduced when dealing with complex and ever-changing mold pressing tasks. They cannot quickly adjust the drive parameters according to the real-time stress on the workpiece, which in turn affects the quality of the mold pressing and production efficiency.

[0006] In summary, there is an urgent need in the existing technology for a solution that can detect the stress on the pressure plate in real time and is widely adaptable to different types of pressure molders, in order to fill this technological gap and improve the overall technical level and production efficiency in the industrial pressure molding field. How to effectively solve this problem is an important direction for the precise and intelligent development of the pressure molding process. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a pressure plate with pressure detection.

[0008] Including pressure plates,

[0009] It also includes a pressure sensor, which is mounted on one end of the pressure plate; the pressure sensor is used to measure the pressure on the pressure plate in real time when it is subjected to force.

[0010] It is also equipped with an electrical control box, which is electrically connected to the pressure sensor, and an external display device is connected to the electrical control box to display the pressure readings measured by the pressure sensor.

[0011] Preferably, the pressure plate is used on a molding die, which includes an L-shaped molding die housing. The L-shaped molding die housing is composed of a vertical cavity and a horizontal cavity. A drive mechanism is installed on one side of the vertical cavity, and a first transmission gear is fixed at the output end of the drive mechanism. An impact block assembly is provided on the other side of the vertical cavity. A transmission rod is rotatably installed in the inner cavity of the impact block assembly. A second transmission gear at the top of the transmission rod meshes with a first transmission gear. A third transmission gear is provided at the bottom of the transmission rod. A fourth transmission gear disk is rotatably installed in the horizontal cavity, and the third transmission gear meshes with the fourth transmission gear disk. A push rod is provided in the transmission sleeve in the middle of the fourth transmission gear disk. The push rod extends through a through hole at the top of the horizontal cavity. The pressure plate is rotatably installed in the bearing seat of the top plate of the horizontal cavity. The tail of the pressure plate abuts against the push rod, and the front of the pressure plate abuts against the workpiece to be pressed.

[0012] Preferably, the pressure sensor is installed on the side of the pressure plate that contacts the top rod.

[0013] Preferably, the pressure sensor is installed on the side of the pressure plate that contacts the workpiece.

[0014] Preferably, the electrical control box is installed on the side of the L-shaped molding die housing.

[0015] Preferably, the drive mechanism is an electric motor.

[0016] Preferably, the drive mechanism is a pneumatic motor.

[0017] Preferably, the driving mechanism is a hydraulic motor.

[0018] Compared with existing technologies, the beneficial effects of this utility model are:

[0019] 1. Visualized Pressure Measurement: By cleverly mounting pressure sensors on the pressure plate, whether installed on the side where the pressure plate contacts the push rod to accurately capture the force transmitted from the drive mechanism, or on the side where the pressure plate contacts the workpiece to directly reflect the force applied by the pressure plate to the workpiece, the pressure can be measured in real time and accurately. Combined with an electrical control box electrically connected to the pressure sensor and an external display device, operators can intuitively see the pressure reading at a glance, eliminating the need for subjective experience. This achieves precise and visualized pressure monitoring, greatly improving the convenience and accuracy of operation.

[0020] 2. High Versatility: From the perspective of adapting to different types of mold presses, the pressure plate of this utility model has excellent versatility. When applied to mold presses with electric motors, pneumatic motors, or hydraulic motors as the drive mechanism, changes in force from any power source can be sensitively captured by the pressure sensor and fed back in real time through the display device. This ensures that the pressure of the pressure plate remains clear and understandable when switching between different drive modes or when dealing with different workpieces and different molding process requirements under the same drive mode. This provides operators with crucial information for quickly adjusting drive parameters, ensuring that the pressure applied to the mold is just right and effectively reducing the scrap rate.

[0021] 3. Precise Data Display: The pressure data of the pressing plate that this invention can acquire in real time can be easily integrated into the factory's automated control system, enabling real-time collection and analysis of production data. This not only facilitates precise control of individual pressing equipment but also optimizes the connection between upstream and downstream processes based on the pressure feedback of the pressing plate at the entire production line level, promoting the entire production process towards intelligence and efficiency, and significantly improving the overall efficiency of industrial production.

[0022] 4. Simple equipment maintenance and replacement: From the perspective of equipment maintenance and process optimization, since the pressure plate pressure can be monitored in real time, once abnormal pressure fluctuations occur, problems such as drive mechanism failure, transmission component wear or uneven workpiece material can be detected in time. This makes it easier to take maintenance measures in advance, reduce equipment downtime, and also provide a data foundation for continuous optimization of the molding process, helping enterprises to continuously improve production processes and enhance market competitiveness. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a pressure plate with pressure detection proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of a pressure plate with pressure detection proposed in this utility model, applied to a molding press.

[0025] In the diagram, 1 is the pressure plate, 2 is the pressure sensor, and 3 is the electrical control box. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Referring to the figure, this embodiment provides a pressure plate with pressure detection.

[0028] Including pressure plate 1,

[0029] It also includes a pressure sensor 2, which is installed at one end of the pressure plate; the pressure sensor is used to measure the pressure when the pressure plate is under force in real time; here the pressure sensor is fastened to the pressure plate 1 by fixing screws in the fixing bolt holes. When installing the pressure sensor 2, it is necessary to drill holes in the pressure plate according to the installation position.

[0030] It is also equipped with an electrical control box 3, which is electrically connected to the pressure sensor. An external display device is connected to the electrical control box to display the pressure readings measured by the pressure sensor.

[0031] Preferably, the pressure plate is used on a molding die, which includes an L-shaped molding die housing. The L-shaped molding die housing is composed of a vertical cavity and a horizontal cavity. A drive mechanism is installed on one side of the vertical cavity, and a first transmission gear is fixed at the output end of the drive mechanism. An impact block assembly is provided on the other side of the vertical cavity. A transmission rod is rotatably installed in the inner cavity of the impact block assembly. A second transmission gear at the top of the transmission rod meshes with a first transmission gear. A third transmission gear is provided at the bottom of the transmission rod. A fourth transmission gear disk is rotatably installed in the horizontal cavity, and the third transmission gear meshes with the fourth transmission gear disk. A push rod is provided in the transmission sleeve in the middle of the fourth transmission gear disk. The push rod extends through a through hole at the top of the horizontal cavity. The pressure plate is rotatably installed in the bearing seat of the top plate of the horizontal cavity. The tail of the pressure plate abuts against the push rod, and the front of the pressure plate abuts against the workpiece to be pressed. For details on the specific structure, please refer to the applicant's prior patent application, patent number 202422245888.7, entitled "An Electric Molding Machine".

[0032] Furthermore, the pressure sensor is installed on the side of the pressure plate that contacts the top rod.

[0033] Furthermore, the pressure sensor is installed on the side of the pressure plate that contacts the workpiece.

[0034] Furthermore, the electrical control box is installed on the side of the L-shaped molding die housing.

[0035] Furthermore, the drive mechanism is an electric motor.

[0036] Furthermore, the drive mechanism is a pneumatic motor.

[0037] Furthermore, the drive mechanism is a hydraulic motor.

[0038] In addition, the pressure sensor can be selected according to actual needs.

[0039] a. Strain Gauge Pressure Sensor: In embodiments used in automotive parts stamping production lines, strain gauge pressure sensors are selected. The internal strain gauge is typically made of metal foil or semiconductor material. When the pressure plate is subjected to pressure, the strain gauge, attached to the surface of the sensor's elastic element, deforms. The resistance of the metal foil or semiconductor material changes due to this physical deformation. According to Ohm's law, under a fixed voltage, the change in resistance causes a change in the current through the strain gauge, thus converting the mechanical deformation caused by pressure into an electrical signal. The strength of this electrical signal corresponds to the magnitude of the pressure applied to the pressure plate and is then transmitted to the electrical control box for further processing.

[0040] b. Piezoelectric Pressure Sensor: In the embodiment of the injection molding process for plastic products, a piezoelectric pressure sensor is used. This sensor utilizes the piezoelectric effect, where certain materials (such as quartz crystals, piezoelectric ceramics, etc.) generate electrical charges on their surfaces when subjected to pressure. When the pressure plate applies pressure to the plastic product, the piezoelectric material in the sensor is compressed, causing a change in its internal crystal structure. This results in a relative displacement of the positive and negative charge centers, accumulating a charge on the material surface that is proportional to the pressure. This charge forms an electrical signal. This electrical signal accurately reflects the pressure applied to the plastic product by the pressure plate and is then transmitted to the control box for operator reference and adjustment.

[0041] c. Pressure sensors suitable for high-pressure environments (such as in the field of metal sheet bending): These sensors mostly operate based on the piezoresistive effect. Their core sensing element is made of a special semiconductor material. When subjected to high pressure from the pressure plate, the crystal structure of the semiconductor material changes, leading to a change in the internal carrier mobility and consequently a significant change in resistance. Similarly, according to Ohm's law, under given power supply conditions, the change in resistance causes a change in the current passing through the sensor, successfully converting the high-pressure signal into an electrical signal that can be recognized and processed by the power control box, ensuring the accuracy and timeliness of pressure monitoring during the metal sheet bending process.

[0042] The practical application scenarios of the above embodiments are as follows:

[0043] The following is a specific embodiment of this patented pressure plate with pressure detection:

[0044] Application Scenario 1:

[0045] On the automotive parts stamping production line, a die press driven by an electric motor is selected. This die press is equipped with a pressure plate with pressure detection as described in this utility model.

[0046] The main structure of the molding press is an L-shaped molding press housing. A 5kW electric motor is securely mounted on one side of its vertical cavity. The output shaft of the electric motor is connected to and fixed to a first transmission gear via a key. On the other side of the vertical cavity, an impact block assembly is precisely positioned. A transmission rod is rotatably mounted within the impact block assembly via high-precision bearings. A second transmission gear at the top of the transmission rod meshes tightly with the first transmission gear, ensuring stable power transmission. A third transmission gear at the bottom of the transmission rod also maintains good meshing with a fourth transmission gear disc rotatably mounted in the horizontal cavity. A high-strength push rod is fitted into the transmission sleeve in the middle of the fourth transmission gear disc, and the push rod extends smoothly through a through-hole at the top of the horizontal cavity.

[0047] A specially designed pressure plate is rotatably mounted on the top plate of the horizontal cavity via a high-quality bearing housing, ensuring flexible rotation. The tail of the pressure plate abuts tightly against the end of the push rod, effectively receiving pressure transmitted from the electric motor via the transmission system. The front of the pressure plate smoothly abuts against the automotive parts to be stamped (such as the blank of an engine block). A high-precision, high-sensitivity strain gauge pressure sensor is used, installed on the side of the pressure plate that contacts the push rod. Its outer layer is wrapped with a protective rubber sleeve, which prevents the sensor from being damaged by impact without affecting the pressure sensing accuracy.

[0048] The electrical control box features a sealed, shock-resistant design and is mounted on the side of the L-shaped molding die housing for easy operator access. Internally, the control box integrates advanced signal conditioning circuitry, a microprocessor, and a data storage module. It is electrically connected to the pressure sensor via a shielded cable, ensuring stable signal transmission free from electromagnetic interference. An external 5-inch LCD screen displays the pressure readings measured by the pressure sensor in real-time, providing a clear and intuitive visual representation in both digital and dynamic chart formats.

[0049] In actual production, the electric motor is started, and power is transmitted sequentially through the first transmission gear, the second transmission gear, the transmission rod, the third transmission gear, and the fourth transmission gear disc to the push rod. The push rod pushes the pressure plate to apply pressure to the automotive part blank. At this time, the pressure sensor senses the force on the pressure plate in real time and transmits the electrical signal to the control box. The control box quickly processes the signal and updates the pressure reading on the LCD screen. The operator uses the information on the display screen to precisely control the stamping pressure. For example, when stamping a critical part of the engine block blank, according to the process requirements, the stamping pressure of that part needs to be stable at 800±50N. By observing the display screen, if the operator finds that the pressure deviates from the set range, they immediately fine-tune the speed of the electric motor and adjust the pressure plate pressure through the transmission system to ensure the stamping quality.

[0050] After multiple production practices, it has been verified that by adopting the pressure plate with pressure detection of this utility model, the scrap rate of the automotive parts stamping production line has been reduced significantly from the original 8% to 2%, the product forming quality has been significantly improved, and the equipment maintenance cycle has been extended by 30% due to the timely detection of potential equipment problems, which has effectively reduced production costs and improved production efficiency.

[0051] Application Scenario 2:

[0052] In the injection molding process of plastic products, a mold press with a pneumatic motor as the driving mechanism is used in combination with the pressure plate of this utility model.

[0053] The L-shaped housing structure of the molding press is similar to that described above. A pneumatic motor serves as the drive mechanism, with its air inlet connected to a factory air source. The air pressure is regulated by a precision pressure regulating valve to output stable power. All gears and push rods in the transmission system are also installed and tested according to high-precision standards.

[0054] The pressure plate is made of high-temperature resistant, high-strength plastic material, suitable for the high-temperature environment of injection molds. The pressure sensor is installed on the side of the pressure plate that contacts the workpiece, so as to directly obtain the actual force applied by the pressure plate to the plastic product. Since the molding of plastic products requires high pressure accuracy, the pressure sensor adopts a piezoelectric sensor with an accuracy of 0.1N, and the electrical control box is compatible with it, with more refined signal processing capabilities.

[0055] In the molding process for producing plastic toy shells, a pneumatic motor is started, and the gas drives the motor to rotate, which in turn drives the transmission system to pressurize the plastic material inside the mold using a pressure plate. A pressure sensor measures the pressure in real time and sends it back to the control box, where a display shows the pressure value. Operators, based on the design requirements of different toy shells, such as wall thickness and structural complexity, and referring to the pressure data on the display screen, precisely adjust the air intake pressure of the pneumatic motor to control the pressure plate pressure.

[0056] Practice has shown that after using the pressure plate of this utility model, the scrap rate of plastic toy shells has been reduced by 10%, the product appearance quality has been greatly improved, the dimensional accuracy meets higher standards, and the mold service life has been extended by 20% due to the reduction of mold wear caused by improper pressure, bringing significant economic benefits to enterprises.

[0057] Application Scenario 3:

[0058] In the field of metal sheet bending processing, a pressure die driven by a hydraulic motor and the pressure plate of this utility model are used.

[0059] The hydraulic motor connects to the factory's hydraulic system, which is equipped with a high-precision relief valve and speed control valve to precisely control the hydraulic oil pressure and flow, thereby regulating the hydraulic motor's output power. In the structure of the molding press, the connections between the various transmission gears, ejector pins, and pressure plates are tightly fitted to ensure effective force transmission.

[0060] The pressure plate is made of wear-resistant, high-strength alloy steel to withstand the high-intensity friction and significant pressure during metal sheet bending. A pressure sensor is installed on the contact side between the pressure plate and the push rod; a sensor capable of withstanding high-pressure environments and possessing a wide measurement range is selected. The electrical control box has powerful data processing and anti-interference capabilities, enabling data interaction with the hydraulic system's control system.

[0061] When bending a 5mm thick stainless steel sheet, the hydraulic motor starts, driving the pressure plate to apply pressure to the sheet. A pressure sensor monitors the pressure in real time, and the operator monitors the pressure via a display device connected to the electrical control box. Combining this with process parameters such as the sheet material and bending angle, the operator adjusts the hydraulic system parameters to precisely control the pressure plate within the required range. For example, for a specific bending angle, the pressure needs to be maintained at 1500±100N. Based on feedback from the display device, the operator promptly adjusts the hydraulic motor's operating status to ensure bending accuracy.

[0062] Statistics show that after using the pressure plate of this utility model, the scrap rate of metal sheet bending processing decreased from 6% to 2%, the bending angle deviation was controlled within ±0.5°, the processing accuracy was greatly improved, and the equipment fault diagnosis and maintenance time was shortened by 40%, which improved production efficiency and enhanced the company's competitiveness in the metal processing market.

[0063] As can be seen from the above embodiments and application scenarios, the pressure plate designed in this utility model has the following advantages in specific applications:

[0064] 1. Visualized Pressure Measurement: By cleverly mounting pressure sensors on the pressure plate, whether installed on the side where the pressure plate contacts the push rod to accurately capture the force transmitted from the drive mechanism, or on the side where the pressure plate contacts the workpiece to directly reflect the force applied by the pressure plate to the workpiece, the pressure can be measured in real time and accurately. Combined with an electrical control box electrically connected to the pressure sensor and an external display device, operators can intuitively see the pressure reading at a glance, eliminating the need for subjective experience. This achieves precise and visualized pressure monitoring, greatly improving the convenience and accuracy of operation.

[0065] 2. High Versatility: From the perspective of adapting to different types of mold presses, the pressure plate of this utility model has excellent versatility. When applied to mold presses with electric motors, pneumatic motors, or hydraulic motors as the drive mechanism, changes in force from any power source can be sensitively captured by the pressure sensor and fed back in real time through the display device. This ensures that the pressure of the pressure plate remains clear and understandable when switching between different drive modes or when dealing with different workpieces and different molding process requirements under the same drive mode. This provides operators with crucial information for quickly adjusting drive parameters, ensuring that the pressure applied to the mold is just right and effectively reducing the scrap rate.

[0066] 3. Precise Data Display: The pressure data of the pressing plate that this invention can acquire in real time can be easily integrated into the factory's automated control system, enabling real-time collection and analysis of production data. This not only facilitates precise control of individual pressing equipment but also optimizes the connection between upstream and downstream processes based on the pressure feedback of the pressing plate at the entire production line level, promoting the entire production process towards intelligence and efficiency, and significantly improving the overall efficiency of industrial production.

[0067] 4. Simple equipment maintenance and replacement: From the perspective of equipment maintenance and process optimization, since the pressure plate pressure can be monitored in real time, once abnormal pressure fluctuations occur, problems such as drive mechanism failure, transmission component wear or uneven workpiece material can be detected in time. This makes it easier to take maintenance measures in advance, reduce equipment downtime, and also provide a data foundation for continuous optimization of the molding process, helping enterprises to continuously improve production processes and enhance market competitiveness.

[0068] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be covered within the protection scope of this utility model.

[0069] Furthermore, it should be understood in the description of this utility model that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] Furthermore, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A pressure plate with pressure detection function. Its features are: Including pressure plates, It also includes a pressure sensor, which is mounted on one end of the pressure plate; the pressure sensor is used to measure the pressure on the pressure plate in real time when it is subjected to force. It is also equipped with an electrical control box, which is electrically connected to the pressure sensor, and an external display device is connected to the electrical control box to display the pressure readings measured by the pressure sensor.

2. A pressure plate with pressure detection according to claim 1, characterized in that, The pressure plate is used on a molding die, which includes an L-shaped molding die housing. The L-shaped molding die housing consists of a vertical cavity and a horizontal cavity. A drive mechanism is installed on one side of the vertical cavity, and a first transmission gear is fixed at the output end of the drive mechanism. An impact block assembly is provided on the other side of the vertical cavity. A transmission rod is rotatably installed in the inner cavity of the impact block assembly. A second transmission gear at the top of the transmission rod meshes with a first transmission gear. A third transmission gear is provided at the bottom of the transmission rod. A fourth transmission gear disc is rotatably installed in the horizontal cavity, and the third transmission gear meshes with the fourth transmission gear disc. A push rod is provided in the transmission sleeve in the middle of the fourth transmission gear disc. The push rod extends through a through hole at the top of the horizontal cavity. A pressure plate is rotatably installed on the bearing seat of the top plate of the horizontal cavity. The tail of the pressure plate abuts against the push rod, and the front of the pressure plate abuts against the workpiece to be pressed.

3. A pressure plate with pressure detection according to claim 2, characterized in that, The pressure sensor is installed on the side of the pressure plate that contacts the top rod.

4. A pressure plate with pressure detection according to claim 2, characterized in that, The pressure sensor is installed on the side of the pressure plate that contacts the workpiece.

5. A pressure plate with pressure detection according to claim 2, characterized in that, The electrical control box is installed on the side of the L-shaped molding die housing.

6. A pressure plate with pressure detection according to claim 2, characterized in that, The drive mechanism is an electric motor.

7. A pressure plate with pressure detection according to claim 2, characterized in that, The drive mechanism is a pneumatic motor.

8. A pressure plate with pressure detection according to claim 2, characterized in that, The drive mechanism is a hydraulic motor.

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