Pressing head assembly and method of operation thereof

Abstract

This invention relates to the field of electronic product manufacturing technology, and discloses a press-fitting head assembly and its working method. The press-fitting head assembly includes a first weight-reducing module, a second weight-reducing module, a top plate, a pressure plate, a first tension / compression sensor, and a second tension / compression sensor. The first weight-reducing module is slidably mounted on the bottom of the top plate via a linear guide rail. The top of the first tension / compression sensor is fixedly mounted on the bottom of the top plate, and the first tension / compression sensor is fixedly connected to the first weight-reducing module via a tension spring. The bottom of the first weight-reducing module is fixedly connected to the top of the second weight-reducing module. The second tension / compression sensor is fixedly mounted on the second weight-reducing module, and the second tension / compression sensor is fixedly connected to the linear guide rail via a compression spring. The bottom of the second tension / compression sensor is fixedly mounted on the pressure plate.

Description

Technical Field

[0001] This invention relates to the field of electronic product manufacturing technology, and in particular to a press-fitting head assembly and its working method. Background Technology

[0002] In the manufacturing process of electronic products, high-precision lamination is a critical process that determines product quality, yield, and reliability. During high-precision lamination, the accuracy of the pressing force is extremely high, and the tolerance range for the pressing force is very strict. Commonly used pressure sensors work by utilizing the principle that when a strain gauge deforms, physical parameters such as the length or cross-sectional area of ​​the sensitive grid change, leading to a change in resistance. The tensile or compressive force value is obtained by reading the electrical signal.

[0003] Currently, conventional pressing devices only have a single tension / compression sensor. The sensor's measurement value changes from negative to positive, causing a zero-point reading and resulting in significant oscillations at this measurement error. Furthermore, commonly used "inverted" pressing devices (press head assemblies) lack a simple and effective way to "tare" the pressure. During the pressing process, before the tension / compression sensor signal changes, the pressure on the pressed product gradually increases from 0 to the weight of the entire pressing device. Only when pressure is further increased does the tension / compression sensor signal begin to change. For pressing processes with lower pressure requirements, such as 5N, the weight of the entire press head assembly often exceeds the pressing force, creating a pressure detection blind zone. Eliminating this blind zone, i.e., achieving precise tare throughout the entire pressing process, becomes a challenge for low-pressure, high-precision pressing.

[0004] Therefore, there is an urgent need for a pressure head assembly that reduces self-weight, has a small range, low load, and high precision. Summary of the Invention

[0005] The purpose of this application is to provide a press head assembly and its working method in response to the technical deficiencies existing in the prior art.

[0006] The technical solution adopted to achieve the purpose of this application is:

[0007] A press head assembly includes a first weight-reducing module, a second weight-reducing module, a top plate, a pressure plate, a first tension / compression sensor, and a second tension / compression sensor;

[0008] The first weight-reducing module is slidably mounted on the bottom of the top plate via a linear guide rail. The top of the first tension / compression sensor is fixedly mounted on the bottom of the top plate, and the first tension / compression sensor is fixedly connected to the first weight-reducing module via a tension spring. The bottom of the first weight-reducing module is fixedly connected to the top of the second weight-reducing module. The second tension / compression sensor is fixedly mounted on the second weight-reducing module, and the second tension / compression sensor is fixedly connected to the linear guide rail via a compression spring. The bottom of the second tension / compression sensor is fixedly mounted on the pressure plate.

[0009] In the above technical solution, the linear guide rail is fixedly installed at the bottom of the top plate by a linear guide rail mounting plate, and a slider is slidably installed on the linear guide rail. The first weight reduction module is fixed to the slider by screws.

[0010] In the above technical solution, the linear guide rail is an air-bearing guide rail.

[0011] In the above technical solution, a mounting block is fixedly installed on the bottom outer side of the first weight-reducing module by screws, one end of the tension spring is connected to the first tension and compression sensor, and the other end of the tension spring is connected to the mounting block.

[0012] In the above technical solution, one end of the tension spring is connected to the first tension / compression sensor via a first adjusting rod, and the other end of the tension spring is connected to the mounting block via a second adjusting rod.

[0013] In the above technical solution, the top of the first adjusting rod is fixedly installed on the bottom of the first tension / compression sensor, the bottom of the first adjusting rod is provided with a first connecting hole, the top of the tension spring is provided with a first hook, the first hook is hooked in the first connecting hole, the top of the second adjusting rod is provided with a second connecting hole, the bottom of the tension spring is provided with a second hook, the second hook is hooked in the second connecting hole, and the bottom of the second adjusting rod is fixedly installed on the mounting block.

[0014] In the above technical solution, a first spring fixing plate is fixedly installed at the bottom of the linear guide mounting plate, the top of the compression spring is fixedly fixed on the first spring fixing plate, a second spring fixing plate is fixedly installed on the second tension / compression sensor, and the bottom of the compression spring is fixedly fixed on the second spring fixing plate.

[0015] In the above technical solution, the pressure plate is provided with a connecting block for installing the second weight reduction module.

[0016] In the above technical solution, the second weight reduction module includes an adjustment plate and a sensor mounting block. The adjustment plate is hinged to the pressure plate via a first pin, and the adjustment plate can be adjusted relative to the pressure plate in the Z-axis direction. The adjusted adjustment plate is fixed to the pressure plate with screws. The sensor mounting block is hinged to the adjustment plate via a second pin, and the sensor mounting block can be adjusted in the X and Y-axis directions, equivalent to the adjustment plate. The adjusted sensor mounting block is fixed to the adjustment plate with screws.

[0017] The second tension / compression sensor is fixedly mounted on the sensor mounting block by screws, and the bottom of the first weight-reducing module is fixedly connected to the sensor mounting block by screws.

[0018] A method for operating a press-fit head assembly includes the following steps:

[0019] Step 1: When the press head assembly is in a free and stationary state, the preload of the tension spring is detected using the first tension / compression sensor. The preload of the compression spring is detected using the second tension / compression sensor. According to the pre-tension amount Calculate the preload of the tension spring According to the preload amount Calculate the preload of the compression spring ;

[0020] Step 2: Drive the pressing head assembly downwards through the actuator so that the bottom of the pressure plate contacts the product to be pressed, and press the product to be pressed.

[0021] Step 3: When pressing the product to be pressed, the first tension and pressure sensor is used to monitor the real-time tension of the tension spring, and the second tension and pressure sensor is used to monitor the real-time pressure of the compression spring. Based on the real-time tension of the tension spring and the real-time pressure of the compression spring, the upward pressing force F of the pressure plate is obtained.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. This invention uses a tension spring + compression spring to linearly transmit the pressing force, so that the values ​​measured by the tension and compression sensors and the displacement appear as an oblique line. This allows for real-time monitoring of the pressing force during the product pressing process, solving the problem that the pressing force curve measured by a single tension and compression sensor in the prior art passes through the origin, affecting the pressure accuracy.

[0024] 2. When the press head assembly of the present invention presses the product, the pressing force on the product is completely linearly related to the spring coefficient, eliminating the pressure detection blind zone in the range of 0 to the self-weight of the press head assembly. It can meet the detection function of small pressing force and realize the detection of pressing force value within the range of good sensor linearity. The pressing force value falls within the range of 20-80% FS, avoiding pressing force overshoot (overpressure) and initial pressure shock fluctuation.

[0025] 3. The adjusting plate and the sensor mounting block of the present invention are axially fixed by a pin. The level of the adjusting plate and the sensor mounting block can be adjusted by screws to achieve the level of the pressing surface. During the pressing process of the pressing head assembly, the pressing force on the product is uniform. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in 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.

[0027] Figure 1 The figure shown is a three-dimensional structural diagram of the press head assembly described in this invention.

[0028] Figure 2 The image shown is a three-dimensional structural diagram of the press head assembly described in this invention from another perspective.

[0029] Figure 3 The figure shown is a three-dimensional structural diagram of the press head assembly with the linear guide rail mounting plate removed, as described in this invention.

[0030] Figure 4 The diagram shown is a schematic of the second weight reduction module and pressure plate structure described in this invention.

[0031] Figure 5 The diagram shown is a partial structural schematic of the press head assembly with the first weight reduction module removed, as described in this invention.

[0032] Figure 6 The diagram shown is a schematic diagram of the moving end structure of the press head assembly described in this invention.

[0033] Figure 7 The diagram shown is a schematic diagram of the moving end of the press head assembly described in this invention from another perspective.

[0034] Figure 8 The diagram shown is a schematic diagram of the fixed end structure of the press head assembly of the present invention.

[0035] Figure 9 The diagram shown is a schematic diagram of the fixed end of the press head assembly described in this invention from another perspective.

[0036] Figure 10 The diagram shown is a force balance diagram of the tension spring, compression spring, and pressing head assembly moving end of the present invention.

[0037] In the diagram: 1-First weight-reducing module, 101-Mounting block, 2-Second weight-reducing module, 201-Adjusting plate, 202-Sensor mounting block, 3-Top plate, 4-Pressure plate, 401-Connecting block, 5-First tension / compression sensor, 6-Second tension / compression sensor, 601-Second spring fixing plate, 7-Linear guide rail, 701-Linear guide rail mounting plate, 702-Slider, 703-First spring fixing plate, 8-Tension spring, 801-First adjusting rod, 802-Second adjusting rod, 803-First connecting hole, 804-First hook, 805-Second connecting hole, 806-Second hook, 9-Compression spring, 10-First pin, 11-Second pin. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0039] Example 1

[0040] A press-fit head assembly, see Figure 1 , Figure 2 , Figure 4 The system includes a first weight-reducing module 1, a second weight-reducing module 2, a top plate 3, a pressure plate 4, a first tension / compression sensor 5, and a second tension / compression sensor 6. The first weight-reducing module 1 is slidably mounted on the bottom of the top plate 3 via a linear guide rail 7. The top of the first tension / compression sensor 5 is fixedly mounted on the bottom of the top plate 3 (by screws). The first tension / compression sensor 5 is fixedly connected to the first weight-reducing module 1 via a tension spring 8. The bottom of the first weight-reducing module 1 is fixedly connected to the top of the second weight-reducing module 2. The second tension / compression sensor 6 is fixedly mounted on the second weight-reducing module 2. The second tension / compression sensor 6 is fixedly connected to the linear guide rail 7 via a compression spring 9. The bottom of the second tension / compression sensor 6 is fixedly mounted on the pressure plate 4.

[0041] The top of the top plate 3 is fixedly connected to the actuator (electric pressure cylinder). When pressing the product to be pressed, the actuator drives the pressing head assembly downwards (the top plate 3 serves as the pressure input end, and the pressure plate 4 serves as the pressure output end). After the pressure plate 4 is in contact with the product to be pressed, it begins to be subjected to an upward pressing force F. The pressure plate 4 moves upwards, and the second weight-reducing module 2 moves upwards synchronously with the pressure plate 4 (compression spring 9 is compressed), thereby driving the first weight-reducing module 1 to slide upwards synchronously along the vertical direction of the linear guide rail 7 (tension spring 8 contracts from its original tension). The first tension / compression sensor 5 detects the tension force of the tension spring 8 in real time, and the second tension / compression sensor 6 detects the compression force of the compression spring 9 in real time, until the pressing force F reaches a preset value. The actuator then drives the pressing head assembly to reset upwards. In this embodiment, the pressing head assembly can detect the pressing force value within the range of good sensor linearity, with the pressing force value falling within the range of 20-80%. The FS range avoids overpressure (overpressure on the product) and initial pressure fluctuations.

[0042] See Figure 1 , Figure 5 The linear guide rail 7 is fixedly mounted on the bottom of the top plate 3 via a linear guide rail mounting plate 701. A slider 702 is slidably mounted on the linear guide rail 7. The first weight-reducing module 1 is fixed to the slider 702 by screws, so that the first weight-reducing module 1 is slidably mounted on the bottom of the top plate 3 via the linear guide rail 7. In this embodiment, the linear guide rail 7 is an air-bearing guide rail, which can significantly reduce the frictional resistance between the first weight-reducing module 1 and the linear guide rail 7 to a negligible level.

[0043] A mounting block 101 is fixedly installed on the outer bottom of the first weight-reducing module 1 by screws. One end of the tension spring 8 is connected to the first tension / compression sensor 5, and the other end of the tension spring 8 is connected to the mounting block 101 to achieve a fixed connection between the first tension / compression sensor 5 and the first weight-reducing module 1. Specifically, one end of the tension spring 8 is connected to the first tension / compression sensor 5 via a first adjusting rod 801, and the other end of the tension spring 8 is connected to the mounting block 101 via a second adjusting rod 802. The top of the first adjusting rod 801 is fixedly installed on the bottom of the first tension / compression sensor 5, and the bottom of the first adjusting rod 801 is provided with a first connecting hole 803. The top of the tension spring 8 is provided with a first hook 804, which is hooked into the first connecting hole 803. The top of the second adjusting rod 802 is provided with a second connecting hole 805, and the bottom of the tension spring 8 is provided with a second hook 806, which is hooked into the second connecting hole 805. The bottom of the second adjusting rod 802 is fixedly installed on the mounting block 101.

[0044] See Figure 3 , Figure 4 The bottom of the linear guide mounting plate 701 is fixedly mounted with a first spring fixing plate 703, the top of the compression spring 9 is fixed on the first spring fixing plate 703, the second tension / compression sensor 6 is fixedly mounted with a second spring fixing plate 601, and the bottom of the compression spring 9 is fixed on the second spring fixing plate 601, so as to realize the fixed connection between the second tension / compression sensor 6 and the linear guide 7.

[0045] For details, see Figure 5 The pressure plate 4 is provided with a connecting block 401 for installing the second weight-reducing module 2 (the connecting block 401 is provided with an adjustment hole and a fixing hole). The second weight-reducing module 2 includes an adjusting plate 201 (the adjusting plate 201 is provided with an adjustment hole and a fixing hole) and a sensor mounting block 202 (the sensor mounting block 202 is provided with an adjustment hole and a fixing hole). The adjusting plate 201 is hinged to the pressure plate 4 by a first pin 10 (the first pin 10 limits the adjusting plate 201 in the X and Y axes). The adjusting plate 201 can be adjusted relative to the pressure plate 4 in the Z axis direction. The adjusted adjusting plate 201 is fixed to the pressure plate 4 by screws. Above; the sensor mounting block 202 is hinged to the adjusting plate 201 via a second pin 11 (the second pin 11 limits the sensor mounting block 202 in the X and Y axes), allowing the sensor mounting block 202 to be adjusted in the X and Y axes, equivalent to adjusting the adjusting plate 201. The adjusted sensor mounting block 202 is then fixed to the adjusting plate 201 with screws, thereby fixing the sensor mounting block 202 to the pressure plate 4. The second tension / compression sensor 6 is fixedly mounted on the sensor mounting block 202 with screws, and the bottom of the first weight-reducing module 1 is fixedly connected to the sensor mounting block 202 with screws.

[0046] Furthermore, the screws described in this embodiment are all internal hex screws, which are easy to tighten and less prone to stripping.

[0047] Example 2

[0048] Based on Example 1, the working method of the press-fit head assembly includes the following steps:

[0049] Step 1: When the press head assembly described in Example 1 is in a free and static state (initial state - no press installation), the preload of the tension spring 8 is detected using the first tension / compression sensor 5. The preload of the compression spring 9 is detected using the second tension / compression sensor 6. According to the pre-tension amount Calculate the preload of tension spring 8 According to the preload amount Calculate the preload of compression spring 9 The pre-tension amount The preload is the initial deformation of the tension spring 8. This represents the initial deformation of the compression spring 9.

[0050] The formula for calculating the preload of the tension spring 8 is as follows:

[0051] ;

[0052] In the formula, This represents the preload of tension spring 8. The spring constant of tension spring 8 is represented by... This represents the preload of tension spring 8.

[0053] The formula for calculating the preload of the compression spring 9 is as follows:

[0054] ;

[0055] In the formula, This represents the preload of compression spring 9. The spring constant of spring 9 represents the spring constant of the compression spring. This represents the preload of the compression spring 9.

[0056] Among them, see Figure 6 , Figure 7 The moving end of the press head assembly includes a first weight-reducing module 1, a mounting block 101, a second weight-reducing module 2, a pressure plate 4, a second tension / compression sensor 6, a second spring fixing plate 601, a slider 702, a second adjusting rod 802, a compression spring 9, and connecting screws and pins; see also Figure 8 , Figure 9 The fixed end of the press head assembly includes a top plate 3, a first tension / compression sensor 5, a linear guide rail 7, a linear guide rail mounting plate 701, a first spring fixing plate 703, a tension spring 8, and a first adjusting rod 801.

[0057] See Figure 10In the free resting state, the press head assembly described in Embodiment 1, under the gravity of the first weight-reducing module 1, mounting block 101, second weight-reducing module 2, pressure plate 4, second tension / compression sensor 6, second spring fixing plate 601, slider 702, second adjusting rod 802, compression spring 9, and connecting screws and pins, the tension spring 8 and compression spring 9 work together. The tension spring 8 is subjected to a downward tension force (the tension spring 8 provides an upward tension force to the moving end of the press head assembly), and the compression spring 9 is subjected to an upward pressure force (the tension spring 8 exerts an upward pressure on the first weight-reducing module 1, mounting block 101, second weight-reducing module 2, pressure plate 4, second tension / compression sensor 6, second spring fixing plate 601, slider 702, second adjusting rod 802, compression spring 9, and connecting screws and pins). When the plate 4, the second tension / compression sensor 6, the second spring fixing plate 601, the slider 702, the second adjusting rod 802, the compression spring 9, and the connecting screws and pins are subjected to tension, part of the tension will act on the compression spring 9. The compression spring 9 is compressed and at the same time provides a downward thrust to the moving end of the press head assembly. At this time, the tension of the tension spring 8, the pressure of the compression spring 9, and the weight of the first weight-reducing module 1, the mounting block 101, the second weight-reducing module 2, the pressure plate 4, the second tension / compression sensor 6, the second spring fixing plate 601, the slider 702, the second adjusting rod 802, the compression spring 9, and the connecting screws and pins are in force balance.

[0058] When the press head assembly is in a free, stationary state, the force balance expression for the tension spring 8 and the compression spring 9 is as follows:

[0059] ;

[0060] ;

[0061] ;

[0062] In the formula, This represents the preload of tension spring 8. The weight of the press head assembly represents the weight of the press head assembly (including the weight of the first weight-reducing module 1, mounting block 101, second weight-reducing module 2, pressure plate 4, second tension / compression sensor 6, second spring fixing plate 601, slider 702, second adjusting rod 802, compression spring 9, and the weight of connecting screws and pins). This represents the preload of compression spring 9. The spring constant of tension spring 8 is represented by... This represents the preload of tension spring 8. The spring constant of spring 9 represents the spring constant of the compression spring. This represents the preload of the compression spring 9.

[0063] Step 2: Drive the pressing head assembly described in Example 1 downwards through the actuator, so that the bottom of the pressing plate 4 contacts the product to be pressed, and press the product to be pressed.

[0064] During the pressing of the product to be pressed, the pressure plate 4 is subjected to an upward pressing force F. The pressing force F acts on the second weight-reducing module 2, causing the second weight-reducing module 2 to move upward. This causes the first weight-reducing module 1, which is connected to the second weight-reducing module 2, to move upward along the vertical direction of the linear guide rail. Consequently, the mounting block 101 moves upward, causing the tension spring 8 to contract (contracting based on the pre-tension of the tension spring 8 when the pressing head assembly is in a free and static state). Simultaneously, the pressing force F on the pressure plate 4 acts on the compression spring 9 between the first weight-reducing module 1 and the second weight-reducing module 2, causing the compression spring 9 to compress.

[0065] Step 3: When pressing the product to be pressed, the first tension and pressure sensor 5 is used to monitor the real-time tension of the tension spring 8, and the second tension and pressure sensor 6 is used to monitor the real-time pressure of the compression spring 9. Based on the real-time tension of the tension spring 8 and the real-time pressure of the compression spring 9, the upward pressing force F (the force on the product during the pressing process) is obtained for the pressure plate 4.

[0066] The real-time tension expression of the tension spring 8 is as follows:

[0067] ;

[0068] In the formula, This represents the real-time tension of tension spring 8. The spring constant of tension spring 8 is represented by... This represents the preload of tension spring 8. This represents the compression amount of the pressing head assembly when pressing the product to be pressed (i.e., the contraction displacement of the tension spring 8 or the compression displacement of the compression spring 9).

[0069] The real-time pressure expression of the compression spring 9 is as follows:

[0070] ;

[0071] In the formula, This represents the real-time pressure of the compression spring 9. The spring constant of spring 9 represents the spring constant of the compression spring. This represents the preload of compression spring 9. This represents the compression amount of the pressing head assembly when pressing the product to be pressed (i.e., the contraction displacement of the tension spring 8 or the compression displacement of the compression spring 9).

[0072] When the press head assembly presses the product to be pressed, the force balance expression of the tension spring 8 and the compression spring 9 is as follows:

[0073] ;

[0074] In the formula, This indicates that the pressure plate 4 is subjected to an upward pressing force (new pressure). This represents the real-time pressure of the compression spring 9. This represents the weight of the press-fit head assembly. This represents the real-time tension of tension spring 8;

[0075] ;

[0076] In the formula, This indicates that the pressure plate 4 is subjected to an upward pressing force (new pressure). The spring constant of tension spring 8 is represented by... This represents the preload of tension spring 8. The spring constant of spring 9 represents the spring constant of the compression spring. This represents the preload of compression spring 9. This represents the weight of the press-fit head assembly. This represents the compression amount of the pressing head assembly when pressing the product to be pressed (i.e., the contraction displacement of the tension spring 8 or the compression displacement of the compression spring 9).

[0077] When the press head assembly described in Example 1 presses the product to be pressed, the product is subjected to force (pressing force F) and... They exhibit a completely linear relationship.

[0078] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0079] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0080] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of operating a press head assembly, comprising: The press head assembly includes a first weight-reducing module, a second weight-reducing module, a top plate, a pressure plate, a first tension / compression sensor, and a second tension / compression sensor. The first weight-reducing module is slidably mounted on the bottom of the top plate via a linear guide rail. The top of the first tension / compression sensor is fixedly mounted on the bottom of the top plate. The first tension / compression sensor is fixedly connected to the first weight-reducing module via a tension spring. The bottom of the first weight-reducing module is fixedly connected to the top of the second weight-reducing module. The second tension / compression sensor is fixedly mounted on the second weight-reducing module. The second tension / compression sensor is fixedly connected to the linear guide rail via a compression spring. The bottom of the second tension / compression sensor is fixedly mounted on the pressure plate. A mounting block is fixedly installed on the bottom outer side of the first weight-reducing module by screws. One end of the tension spring is connected to the first tension and compression sensor, and the other end of the tension spring is connected to the mounting block. One end of the tension spring is connected to the first tension / compression sensor via a first adjusting rod, and the other end of the tension spring is connected to the mounting block via a second adjusting rod. The top of the first adjusting rod is fixedly installed on the bottom of the first tension / compression sensor. The bottom of the first adjusting rod is provided with a first connecting hole. The top of the tension spring is provided with a first hook, which is hooked into the first connecting hole. The top of the second adjusting rod is provided with a second connecting hole. The bottom of the tension spring is provided with a second hook, which is hooked into the second connecting hole. The bottom of the second adjusting rod is fixedly installed on the mounting block. A first spring fixing plate is fixedly installed at the bottom of the linear guide mounting plate, the top of the compression spring is fixedly fixed on the first spring fixing plate, a second spring fixing plate is fixedly installed on the second tension / compression sensor, and the bottom of the compression spring is fixedly fixed on the second spring fixing plate. The pressure plate is provided with a connecting block for installing the second weight reduction module; The second weight reduction module includes an adjustment plate and a sensor mounting block. The adjustment plate is hinged to the pressure plate via a first pin. The adjustment plate is adjusted relative to the pressure plate in the Z-axis direction, and the adjusted adjustment plate is fixed to the pressure plate with screws. The sensor mounting block is hinged to the adjustment plate via a second pin. The sensor mounting block is adjusted relative to the adjustment plate in the X-axis and Y-axis directions, and the adjusted sensor mounting block is fixed to the adjustment plate with screws. The second tension / compression sensor is fixedly mounted on the sensor mounting block by screws, and the bottom of the first weight-reducing module is fixedly connected to the sensor mounting block by screws. The operation method of the press-fit head assembly includes the following steps: Step 1: When the press head assembly is in a free and stationary state, the preload of the tension spring is detected using the first tension / compression sensor. The preload of the compression spring is detected using the second tension / compression sensor. According to the pre-tension amount Calculate the preload of the tension spring. According to the preload amount Calculate the preload of the compression spring ; Step 2: Drive the pressing head assembly downward through the actuator so that the bottom of the pressure plate contacts the product to be pressed, and press the product to be pressed. Step 3: When pressing the product to be pressed, the first tension and pressure sensor is used to monitor the real-time tension of the tension spring, and the second tension and pressure sensor is used to monitor the real-time pressure of the compression spring. Based on the real-time tension of the tension spring and the real-time pressure of the compression spring, the upward pressing force F of the pressure plate is obtained.

2. The method of operating a press head assembly according to claim 1, wherein, The linear guide rail is fixedly installed on the bottom of the top plate by a linear guide rail mounting plate, and a slider is slidably installed on the linear guide rail. The first weight reduction module is fixed to the slider by screws.

3. The method of operating a press head assembly as defined in claim 1, wherein, The linear guide rail is an air-bearing guide rail.

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