Integrated multifunction indenter device with controllable indentation depth

Abstract

This invention discloses an integrated multi-functional press head device with controllable pressing depth, comprising a housing, a rivet nose, a press rod, and a conveying mechanism. The conveying mechanism is used to convey the rivet to be pressed in, and includes a connecting block disposed between the housing and the rivet nose. The housing, connecting block, and rivet nose are provided with pressing channels for the press rod to move and perform riveting. The connecting block is provided with a conveying channel and a first gas channel. The conveying channel has a pressing position located on the pressing channel, and the first gas channel is disposed corresponding to the pressing position, used to blow gas into the pressing channel or extract gas from the pressing channel for airtightness testing. The housing is provided with a displacement sensor for monitoring the displacement of the press rod. This integrated multi-functional press head device can control the rivet pressing depth and detect whether the underlying support mold is damaged.

Description

Technical Field

[0001] This invention belongs to the technical field of riveting equipment, specifically relating to an integrated multi-functional press head device that can control the pressing depth and achieve air blowing or air extraction. Background Technology

[0002] Currently, riveting technology is increasingly used in automobile bodies. For this type of riveting process, the relative protrusion height of the rivet after insertion, i.e., the insertion depth, is a crucial quality indicator. However, due to issues such as coating peeling off the rivets and debris generated during sheet metal riveting, maintaining cleanliness within the indenter is also a challenge. Furthermore, existing equipment cannot detect damage to the underlying support mold.

[0003] For example, patent CN110605277A discloses a chip removal device and a riveting machine. Although it discloses that gas is used for cleaning during riveting, the chip removal device and the riveting component are two separate parts. On the one hand, it occupies a lot of space, and on the other hand, it does not meet the needs of existing automated production that may require the riveting device to be moved to rivet a specific position on the car body. Furthermore, it cannot detect whether the supporting mold below is damaged.

[0004] The above background information is provided only to aid in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this invention. In the absence of clear evidence that the above information was disclosed before the filing date of this invention, the above background information should not be used to evaluate the novelty and inventiveness of this invention. Summary of the Invention

[0005] In view of this, in order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an integrated multi-functional press head device with controllable pressing depth, which can control the pressing depth of the rivet and perform air blowing or air extraction, and integrate them together.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An integrated multi-functional press head device with controllable pressing depth includes a housing, a rivet nose, a press rod, and a conveying mechanism. The conveying mechanism is used to convey the rivet to be pressed in. The conveying mechanism includes a connecting block disposed between the housing and the rivet nose. The housing, connecting block, and rivet nose are provided with pressing channels for the press rod to move and perform pressing. The connecting block is provided with a conveying channel and a first gas channel. The conveying channel has a pressing position located on the pressing channel. One end of the first gas channel is disposed corresponding to the pressing position and is used to blow gas into the pressing channel or extract gas from the pressing channel and monitor the gas pressure to perform airtightness testing and detect the movement of the rivet into position before pressing. The housing is provided with a displacement sensor for monitoring the displacement of the press rod.

[0007] In some embodiments, the connecting block includes an upper connecting block and a lower connecting block. The upper connecting block is fixed to the lower part of the housing, and the lower connecting block is preferably integrally formed with the rivet nose. The upper and lower connecting blocks, when combined, form a conveying channel for conveying rivets. The conveying mechanism conveys the rivets through the conveying channel to the pressing position. The pressing rod presses down in the pressing channel, and after contacting the rivet at the pressing position, it continues to press down to perform riveting.

[0008] According to some preferred embodiments of the invention, a support mold is located below the rivet nose and mates with the bottom of the rivet nose. The support mold is used to seal the bottom of the press-in channel for airtightness testing. During airtightness testing, the support mold mates with the bottom of the rivet nose, and then gas is blown into or drawn from the press-in channel through a first gas channel while monitoring the gas pressure. When the gas pressure is abnormal, it indicates that the support mold is damaged, resulting in gas leakage.

[0009] According to some preferred embodiments of the present invention, one end of the first gas channel is connected to the pressing position, and the other end is connected to a filtering mechanism and / or a gas control mechanism. The gas control mechanism is used to supply or extract gas into the first gas channel and monitor the gas pressure, and the filtering mechanism is used to filter the extracted gas. By providing the filtering mechanism and the gas control mechanism, gas can be extracted from the pressing channel before and / or after riveting begins, thereby performing cleaning and chip removal, and filtering impurities through the filtering mechanism; at the same time, it is possible to detect the movement of the rivet into place before riveting.

[0010] According to some preferred embodiments of the present invention, a second gas channel is provided on the housing, and the second gas channel communicates with the first gas channel; a first sealing ring is provided on the housing and the connecting block at the connection position corresponding to the first gas channel and the second gas channel. The first gas channel is opened inside the connecting block, and the second gas channel is opened inside the housing, avoiding the position of the press-in channel.

[0011] According to some preferred embodiments of the invention, the pressing channel and the conveying channel are arranged intersectingly and coincide at the pressing position. The pressing position is located at the end of the conveying channel.

[0012] According to some preferred embodiments of the present invention, the press-in channel includes a first press-in channel disposed on the housing, a second press-in channel disposed on the connecting block, and a third press-in channel disposed on the rivet nose. The first, second, and third press-in channels are sequentially connected in a vertical direction. The end of the conveying channel near the second press-in channel is disposed in a horizontal direction, and the second press-in channel is located at the end of the conveying channel. The rivet enters the press-in position through the conveying channel. The lower end of the pressure rod enters the second press-in channel through the first press-in channel. After contacting the upper surface of the rivet at the press-in position in the second press-in channel, the pressure rod continues to press down, pushing the rivet into the third press-in channel, and continues to press down to contact the workpiece for riveting.

[0013] According to some preferred embodiments of the present invention, a clamping plate is provided within the pressing channel, the clamping plate extending along the pressing direction of the rivet; the clamping plate is movably disposed on the inner wall of the pressing channel for clamping the rivet during the pressing process. The clamping plate is used to hold the rivet in the pressing position to prevent the rivet from falling directly.

[0014] In some embodiments, two clamping plates are arranged opposite each other on both sides of the conveying channel within the pressing channel. The upper ends of the clamping plates are slidably mounted on the lower connecting block and extend downward within the third pressing channel. A spring is also provided on the lower connecting block, which provides a tendency for the two clamping plates to move inwards to clamp the rivet. Specifically, the spring is positioned corresponding to the upper ends of the clamping plates, and its extension direction is perpendicular to the extension direction of the clamping plates. A limit block is provided at the middle position of the lower connecting block corresponding to the spring. One end of the spring is bent and positioned corresponding to the upper end of the clamping plate. Clamping of the rivet is achieved through the lever principle and the elastic restoring force of the spring.

[0015] According to some preferred embodiments of the invention, a drive mechanism is included for moving the pressure rod within the pressing channel. The drive mechanism includes a connecting rod connected to the pressure rod and a driver for moving the connecting rod. A fixing block is fixed to the pressure rod or the connecting rod, and a displacement sensor is used to monitor the position of the fixing block and thus control the displacement of the pressure rod. The pressure rod is connected to the lower end of the connecting rod, and the driver drives the connecting rod to move, with the connecting rod and the pressure rod moving synchronously. The fixing block is located at the connection between the pressure rod and the connecting rod to strengthen the connection. Preferably, the displacement sensor is an inductive sensor, and a detection ring cooperating with the displacement sensor is provided on the fixing block; or preferably, the displacement sensor is a grating ruler displacement sensor, and a corresponding grating ruler is provided on the detection ring, to better monitor the movement distance of the pressure rod.

[0016] According to some preferred embodiments of the present invention, the drive mechanism includes a guide housing and a fixed seat, the lower part of the fixed seat is fixed to the housing, the upper part of the fixed seat is located inside the guide housing, a floating cavity is provided inside the guide housing, the top of the fixed seat moves relative to the floating cavity, and the connecting rod passes through the top of the fixed seat.

[0017] According to some preferred embodiments of the present invention, the fixing seat is provided with a receiving cavity for accommodating the lower part of the connecting rod and the pressure rod, and the connecting rod has a limiting ring located within the receiving cavity. The outer diameter of the limiting ring matches the inner diameter of the receiving cavity.

[0018] According to some preferred embodiments of the present invention, an elastic element is provided between the fixing block and the limiting ring, and the elastic element is accommodated in the receiving cavity; the outer diameter of the elastic element is larger than the outer diameter of the fixing block and the inner diameter of the elastic element is smaller than the outer diameter of the fixing block, one end of the elastic element acts on the fixing block and the other end of the elastic element acts on the limiting ring.

[0019] According to some preferred embodiments of the invention, a pressure-bearing seat is fixed inside the housing. The inner diameter of the pressure-bearing seat is larger than the outer diameter of the fixed block and smaller than the outer diameter of the elastic element. The outer diameter of the pressure-bearing seat is larger than or equal to the outer diameter of the elastic element, so as to contact the elastic element and compress it.

[0020] According to some preferred embodiments of the invention, the housing has a receiving groove for accommodating the fixing block during pressing, the pressing channel being located at the bottom of the receiving groove and extending downward from the bottom of the receiving groove; the receiving groove communicates with a receiving cavity; the housing has a pressurizing channel communicating with the receiving groove, the pressurizing channel being used to increase the air pressure in the receiving groove and the receiving cavity to form an air spring. The receiving groove centers the fixing block, thereby ensuring the stability of the pressure rod during the riveting process.

[0021] According to some preferred embodiments of the present invention, a second sealing ring is provided in the pressing channel, the second sealing ring being positioned lower than the pressurizing channel; the second sealing ring cooperates with the pressing rod to achieve a seal, so that the receiving groove and the receiving cavity form a sealed space; the pressurizing channel is used to inject pressure into the space (receiving groove and receiving cavity) between the limiting ring and the second sealing ring to keep the positions of the connecting rod and the fixing seat relatively fixed. Preferably, another sealing ring is provided between the top of the connecting rod and the fixing seat, forming a sealed space between the sealing ring and the second sealing ring, and the pressurizing channel injects pressure into this sealed space to form an air spring, so that the positions of the connecting rod and the fixing seat remain relatively fixed, thereby driving the connecting rod to move while the driver moves it, which in turn moves the fixing seat and the housing, connecting block, rivet nose, etc., fixed to the fixing seat, and can move them to a designated position for riveting.

[0022] According to some preferred embodiments of the invention, the housing has a first interface communicating with the second gas passage and the gas control mechanism; the housing also has a second interface communicating with the pressurization passage. The second interface is positioned higher than the horizontal position of the first interface.

[0023] Due to the adoption of the above technical solutions, the advantages of the present invention compared with the prior art are as follows: The integrated multi-functional press head device of the present invention, which controls the pressing depth, realizes the control of the rivet pressing depth by setting a displacement sensor on the housing for monitoring the displacement of the press rod; at the same time, a first gas channel is set corresponding to the pressing channel, and gas is blown into the pressing channel or extracted from the pressing channel and the gas pressure is monitored to perform airtightness detection, thereby detecting whether the supporting mold below is damaged. It can also perform cleaning and chip removal during the gas transportation process, and confirm that the rivet is fed in place by suction detection of air pressure after the rivet is delivered. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the integrated multi-functional pressure head device in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the integrated multi-functional pressure head device in an embodiment of the present invention; Figure 3This is a three-dimensional structural diagram of the integrated multi-functional pressure head device after concealing the driver and guide housing in an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the integrated multi-functional pressure head device in an embodiment of the present invention, after concealing the driver and guide housing; Figure 5 This is a three-dimensional structural diagram of the integrated multi-functional pressure head device in an embodiment of the present invention, after concealing the drive mechanism and the conveying mechanism; Figure 6 This is a schematic cross-sectional view of the integrated multi-functional pressure head device in an embodiment of the present invention, after concealing the drive mechanism and the conveying mechanism. Figure 7 This is a three-dimensional structural diagram of the integrated multi-functional pressure head device after concealing the drive mechanism, conveying mechanism, and rivet nose in an embodiment of the present invention. In the attached diagram, the components are: conveying mechanism-1, conveying pipe-11, bend-pipe-12, upper connecting block-131, lower connecting block-132, conveying channel-14, limiting block-15, driving mechanism-2, driver-21, connecting rod-22, limiting ring-221, fixing block-23, detection ring-231, guide shell-24, fixing seat-25, floating cavity-26, receiving cavity-27, elastic element-28, shell-31, receiving groove-331, rivet nose-32, pressure rod-4, first pressing channel-51, second pressing channel-52, third pressing channel-53, position to be pressed-in-54, pressure seat-6, first interface-71, second interface-72, displacement sensor-73, clamping plate-81, spring piece-82, first gas channel-91, first sealing ring-92, second sealing ring-93. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, the integrated multi-functional press head device with controllable pressing depth in this embodiment includes a drive mechanism 2, a housing 31, a rivet nose 32, a press rod 4, and a conveying mechanism 1. The drive mechanism 2 is used to drive the press rod 4 to move, the conveying mechanism 1 is used to convey the rivet to be pressed in, and the press rod 4 is used to contact the rivet and drive the rivet to move under the drive of the drive mechanism 2 to perform riveting.

[0028] The conveying mechanism 1 includes a conveying pipe 11, a bend 12, and a connecting block arranged sequentially. The connecting block has a conveying channel 14, the end of which is the rivet pressing position 54. The channels in the conveying pipe 11 and the bend 12 are connected to the conveying channel 14 of the connecting block. The rivet is fed into the conveying channel 14 of the connecting block through the conveying pipe 11 and the bend 12, and then enters the pressing position 54 to await pressing. The conveying pipe 11 is a flexible hose, allowing the integrated multi-functional pressing head device to move as a whole without affecting the rivet conveying, facilitating automated riveting processes.

[0029] The connecting block is disposed between the housing 31 and the rivet nose 32, i.e., the housing 31, the connecting block, and the rivet nose 32 are stacked. The housing 31, the connecting block, and the rivet nose 32 are provided with pressing channels for the pressure rod 4 to move and perform riveting, including a first pressing channel 51 on the housing 31, a second pressing channel 52 on the connecting block, and a third pressing channel 53 on the rivet nose 32. The first pressing channel 51, the second pressing channel 52, and the third pressing channel 53 are sequentially connected vertically. The end of the conveying channel 14 on the connecting block near the second pressing channel 52 is arranged horizontally, and the second pressing channel 52 is located at the end of the conveying channel 14. The pressing position 54 is part of the second pressing channel 52. That is, the pressing channels and the conveying channel 14 are intersected and coincide at the pressing position 54. The rivet enters the pressing position 54 through the conveying channel 14. The lower end of the pressure rod 4 enters the second pressing channel 52 through the first pressing channel 51. After the pressure rod 4 contacts the upper surface of the rivet at the pressing position 54 in the second pressing channel 52, it continues to press down, pushing the rivet into the third pressing channel 53, and continues to press down to contact the workpiece for riveting.

[0030] A first gas channel 91 is provided on the connecting block, with one end of the first gas channel 91 corresponding to the pressing position 54. This channel is used to blow gas into or extract gas from the pressing channel (vacuuming) for airtightness testing. It also allows for ensuring the rivet is in place by evacuating and testing the gas pressure. A second gas channel (not shown) is provided on the housing 31, communicating with the first gas channel 91. A first sealing ring 92 is provided at the connection position between the housing 31 and the connecting block corresponding to the first and second gas channels 91. The first gas channel 91 is located inside the connecting block, and the second gas channel is located inside the housing 31, avoiding the pressing channel.

[0031] The connecting block in this embodiment includes an upper connecting block 131 and a lower connecting block 132 stacked together. The upper connecting block 131 is fixed to the bottom of the housing 31, and the lower connecting block 132 is preferably integrally formed with the rivet nose 32. The upper connecting block 131 and the lower connecting block 132 are combined to form a conveying channel 14 for conveying rivets. The conveying mechanism 1 conveys the rivet through the conveying channel 14 to the pressing position 54. The pressing rod 4 presses down in the pressing channel, and continues to press down after contacting the rivet at the pressing position 54 to perform riveting.

[0032] During riveting, a bearing mold that mates with the bottom of the rivet nose 32 is located below the rivet nose 32. The integrated multi-functional pressing head device in this embodiment can detect whether the bearing mold is damaged. Specifically, one end of the first gas channel 91 is connected to the pressing position 54, and the other end is connected to a filter mechanism (not shown) and a gas control mechanism (not shown) via a second gas channel on the housing 31. The gas control mechanism is used to supply or extract gas into the first gas channel 91 and monitor the gas pressure, while the filter mechanism is used to filter the extracted gas. The housing 31 has a first interface 71, which connects to the second gas channel and the gas control mechanism. When an airtightness test is required, the bearing mold mates with the bottom of the rivet nose 32 to seal the bottom of the pressing channel. Then, gas is blown into or extracted from the pressing channel through the gas control mechanism, the first interface 71, the second gas channel, and the first gas channel 91, and the gas pressure is monitored. When the gas pressure is abnormal, it indicates that the bearing mold is damaged, leading to gas leakage. Furthermore, by incorporating a filtration and gas control mechanism, gas can be extracted from the injection channel before and / or after riveting (e.g., by using a vacuum pump) for cleaning and chip removal, while the filtration mechanism filters and collects impurities. In other words, the gas channel and airflow configuration achieves three functions: vacuuming to ensure rivet placement; monitoring air pressure to detect damage to the supporting mold; and cleaning and chip removal.

[0033] A clamping plate 81 is provided within the pressing channel, extending along the pressing direction of the rivet. The upper end of the clamping plate 81 is movably mounted on the inner wall of the pressing channel to clamp the rivet at the pressing position 54, preventing it from falling directly and to clamp the rivet during the pressing process. In this embodiment, two clamping plates 81 are arranged opposite each other on both sides of the conveying channel 14 within the pressing channel. The upper ends of the clamping plates 81 are slidably mounted on the lower connecting block 132 and extend downward along the third pressing channel 53. A spring piece 82 is also provided on the lower connecting block 132, which provides a tendency for the two clamping plates 81 to move inward to clamp the rivet. Specifically, the spring piece 82 is positioned corresponding to the upper end of the clamping plate 81, and the extending direction of the spring piece 82 is perpendicular to the extending direction of the clamping plate 81. A limit block 15 is provided at the middle position or the other end of the lower connecting block 132 corresponding to the spring piece 82. One end of the spring piece 82 is bent and is provided at the upper end of the clamping plate 81. The rivet is clamped by lever principle and elastic restoring force of spring piece 82.

[0034] The drive mechanism 2 in this embodiment includes a guide housing 24, a fixed base 25, a connecting rod 22 connected to the pressure rod 4, and a driver 21 for driving the connecting rod 22 to move. The lower part of the fixed base 25 is fixed to the housing 31, and the upper part of the fixed base 25 is located inside the guide housing 24. A floating cavity 26 is provided inside the guide housing 24, and the top of the fixed base 25 can move relative to the pressure rod 4 within the floating cavity 26. The connecting rod 22 passes through the top of the fixed base 25 and connects downward to the pressure rod 4. A receiving cavity 27 is provided inside the fixed base 25 to accommodate the lower part of the connecting rod 22 and the pressure rod 4. The connecting rod 22 has a limiting ring 221, which is located inside the receiving cavity 27. The outer diameter of the limiting ring 221 matches the inner diameter of the receiving cavity 27.

[0035] The pressure rod 4 is connected to the lower end of the connecting rod 22. The driver 21 drives the connecting rod 22 to move, and the connecting rod 22 and the pressure rod 4 move synchronously. A fixing block 23 is provided at the connection between the pressure rod 4 and the connecting rod 22 to strengthen the connection between the pressure rod 4 and the connecting rod 22. A displacement sensor 73 is provided on the housing 31 to monitor the displacement of the pressure rod 4. The displacement sensor 73 is used to monitor the position of the fixing block 23 and thus control the displacement of the pressure rod 4. Preferably, the displacement sensor 73 is an inductive sensor. A detection ring 231 that cooperates with the displacement sensor 73 is provided on the fixing block 23 to better monitor and control the movement distance of the pressure rod 4. Since the displacement sensor 73 is fixed on the housing 31, the pressure rod 4 ultimately controls the depth of the rivet pressing in. It is also positionally related to the rivet nose 32, which is directly fixed on the housing. Through the detection of this displacement sensor 73, the direct height difference between the pressure rod 4 and the rivet nose 32 can be directly detected. In other words, the height difference between the top of the rivet and the workpiece being pressed in can be directly known, i.e., the relative position height. Thus, the pressing depth of the rivet can be adjusted and controlled, and the pressing depth can be made controllable.

[0036] In some embodiments, the displacement sensor 73 is preferably a grating ruler sensor, and the grating ruler is integrated on the detection ring 231. The two work together to achieve displacement detection.

[0037] An elastic element 28 is provided between the fixing block 23 and the limiting ring 221, and the elastic element 28 is housed within the receiving cavity 27. The outer diameter of the elastic element 28 is larger than the outer diameter of the fixing block 23, and the inner diameter of the elastic element 28 is smaller than the outer diameter of the fixing block 23. The lower end of the elastic element 28 acts on the fixing block 23, and the upper end of the elastic element 28 acts on the limiting ring 221. A pressure-bearing seat 6 is fixed inside the housing 31. The inner diameter of the pressure-bearing seat 6 is larger than the outer diameter of the fixing block 23 and smaller than the outer diameter of the elastic element 28. The outer diameter of the pressure-bearing seat 6 is greater than or equal to the outer diameter of the elastic element 28, so as to contact the elastic element 28 and compress it. Buffering is achieved through the elastic element 28 and the pressure-bearing seat 6. Simultaneously, the function of the elastic element 28 is to provide clamping force before the rivet is finally riveted in, so that the bottom of the rivet is flat against the workpiece. The elastic element 28 is preferably a mechanical spring.

[0038] The housing 31 has a receiving groove 331 for accommodating the fixing block 23 during pressing, and the receiving groove 331 communicates with the receiving cavity 27; the pressing channel is located at the bottom of the receiving groove 331 and extends downward from the bottom of the receiving groove 331; the housing 31 has a pressurizing channel communicating with the receiving groove 331, and the pressurizing channel is used to increase the air pressure in the receiving groove 331 and the receiving cavity 27 to form an air spring. The receiving groove 331 centers the fixing block 23, thereby ensuring the stability of the pressure rod 4 during the riveting process. The housing 31 has a second interface 72, which communicates with the pressurizing channel. The position of the second interface 72 is higher than the horizontal position of the first interface 71.

[0039] In this embodiment, a second sealing ring 93 is provided within the pressurization channel. The position of the second sealing ring 93 is lower than that of the pressurization channel. The second sealing ring 93 is used to cooperate with the pressure rod 4 to achieve a seal, so that the receiving groove and the receiving cavity form a sealed space. The pressurization channel is used to inject pressure into the sealed space within the limiting ring 221 and the second sealing ring 93 to keep the positions of the connecting rod 22 and the fixing seat 25 relatively fixed. Preferably, another sealing ring is provided between the top of the connecting rod 22 and the fixing seat 25. This sealing ring and the second sealing ring 93 form a sealed space (receiving groove 331 and receiving cavity 27), and this sealed space always exists, that is, the bottom of the pressure rod 4 is always lower than the second sealing ring 93 to maintain a seal. The pressurization channel injects pressure into the sealed space, which forms an air spring structure, providing a force of 300-1000N. This keeps the positions of the connecting rod 22 and the fixed seat 25 relatively fixed during the initial movement. Then, the driver 21 drives the connecting rod 22 to move, which in turn moves the fixed seat 25, the housing 31 fixed to the fixed seat 25, the connecting block, the rivet nose 32, etc., together, so that they can be moved to the designated position for riveting.

[0040] This embodiment of the integrated multi-functional press head device with controllable pressing depth achieves control over the rivet pressing depth by setting a displacement sensor 73 on the housing 31 to monitor the displacement of the press rod 4. At the same time, a first gas channel 91 is set corresponding to the pressing channel to blow gas into the pressing channel or extract gas from the pressing channel and monitor the air pressure to perform airtightness detection. This allows for the detection of whether the supporting mold below is damaged. It also enables cleaning and chip removal during the gas delivery process, and confirms that the rivet is in place by detecting the air pressure after the rivet is delivered.

[0041] The following is a brief description of the working process of the integrated multi-functional indenter device with controllable indentation depth in this embodiment: In the initial state, the lower end of the guide housing 24 is located at the lower end of the fixed seat 25, the top of the fixed seat 25 is located at the top of the floating cavity 26, and the bottom of the pressure rod 4 is lower than the second sealing ring 93. The lower end of the pressure rod 4 cooperates with the second sealing ring 93 to achieve a seal. The pressurization channel injects pressure into the sealed space (accommodating groove 331 and accommodating cavity 27) to form an air spring of 300-1000N. At this time, the integrated multi-functional pressure head device can be moved to the set riveting position and is positioned above the supporting mold.

[0042] The integrated multi-functional pressure head device is brought close to the bearing mold, so that the bottom end of the bearing mold is sealed by the rivet nose 32. Then, the gas control mechanism blows air or evacuates the pressure channel below the pressure rod 4 through the first interface 71, the second gas channel, and the first gas channel 91 to judge the air pressure. If the air pressure is abnormal, it means that there is a gas leak and the bearing mold is damaged. Preferably, a vacuum is drawn and the abnormality is judged based on the vacuum degree.

[0043] If the mold is undamaged, the riveting operation is performed. First, the driver 21 drives the connecting rod 22 to move. Under the action of the air spring, the top of the limiting ring 221 of the connecting rod 22 always abuts against the top of the cavity 27 inside the fixed seat 25. The relative position of the connecting rod 22 and the fixed seat 25 remains unchanged. The whole unit moves downward and makes the rivet nose 32 fit tightly against the workpiece. The air spring in the sealed space provides preload. At the same time, the rivet is conveyed to the pressing position 54 through the conveying channel 14 of the conveying mechanism 1. At this time, a vacuum can also be drawn and the air pressure can be detected to ensure that the rivet is delivered in place. When the rivet enters the pressing position 54, the clamping plates 81 on both sides are pushed away from each other. Under the action of the spring 82, the clamping plates 81 tend to move closer to each other, thereby clamping the rivet.

[0044] Subsequently, the actuator 21 continues to drive. When the force provided by the actuator 21 continues to increase and exceeds the force provided by the air spring, the connecting rod 22 drives the pressure rod 4, the fixing block 23, and the elastic element 28 to move downwards, and the rivet moves closer to the workpiece in the pressing channel. The rivet is held by the clamping plate 81 during the pressing process. After the elastic element 28 contacts the pressure seat 6, it continues to press down a certain distance, so that the bottom of the rivet is flat against the workpiece, and the elastic element 28 provides clamping force. At this time, it is in the state of preparation for pressing. The detection ring 231 of the fixing block 23 can be detected by the displacement sensor 73. By changing the depth of the fixing block 23 in the next step, the sensor value changes, and the displacement sensor 73 can directly know the pressing depth of the pressure rod 4.

[0045] Afterwards, the actuator 21 continues to drive, causing the connecting rod 22 to press down the pressure rod 4. The rivet passes through the workpiece, and with the cooperation of the bottom supporting mold, the riveting is achieved. During this process, the displacement sensor 73 monitors the displacement of the fixing block 23, which corresponds to the pressing depth of the pressure rod 4. If the predetermined depth is not achieved, the actuator 21 is controlled to continue operating so that the pressure rod 4 continues to press in, achieving a controllable pressing depth. At this point, one pressing action is completed. The actuator 21 reverses its operation, and under the action of the air spring, the connecting rod 22 drives the fixing seat 25 to reset, waiting for the next riveting action.

[0046] Once the bottom of the pressure rod 4 moves above the pressing position 54, the gas control mechanism activates, drawing a vacuum from the pressing channel below the pressure rod 4 through the first interface 71, the second gas channel, and the first gas channel 91. Cleaning and chip removal are achieved through airflow, and preferably, the filtration mechanism is used to filter and collect impurities.

[0047] The integrated multi-functional pressure head device of this embodiment, on the one hand, detects the moving distance of the fixed block 23 through a built-in displacement detection method, directly controls the extension length of the pressure rod 4, thereby directly controlling the pressing depth of the rivet, and finally detecting the pressing depth of the rivet; on the other hand, it integrates an air spring as a pressing and feeding structure for the idle stroke, and uses an elastic element 28 to provide the final pressing force for the rivet to press the workpiece, so that the rivet can effectively press the metal workpiece; at the same time, it integrates a gas channel inside, which can not only draw a vacuum to ensure that the rivet is adsorbed into place, but also draw a vacuum to clean and adsorb dust or remove chips, which can effectively keep the inside of the pressure head clean, thereby effectively reducing the jamming rate, and can detect abnormal damage to the lower supporting mold, without integrating other additional components, thus improving production stability.

[0048] The above embodiments prepared by the method of the present invention are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0049] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. An integrated multi-functional indenter device with controllable indentation depth, characterized in that, The device includes a housing, a rivet nose, a pressure rod, and a conveying mechanism. The conveying mechanism is used to convey the rivet to be pressed in. The conveying mechanism includes a connecting block disposed between the housing and the rivet nose. The housing, connecting block, and rivet nose are provided with pressing channels for the pressure rod to move and perform riveting. The connecting block is provided with a conveying channel and a first gas channel. The conveying channel has a pressing position located on the pressing channel. One end of the first gas channel is disposed corresponding to the pressing position and is used to blow gas into the pressing channel or extract gas from the pressing channel and monitor the gas pressure. The housing is provided with a displacement sensor for monitoring the displacement of the pressure rod. Includes a support mold located below the rivet nose and engaging with the bottom of the rivet nose, the support mold being used to seal the bottom of the press-in channel for airtightness testing; One end of the first gas channel is connected to the position to be pressurized, and the other end is connected to a filter mechanism and / or a gas control mechanism. The gas control mechanism is used to deliver gas into or extract gas into the first gas channel and monitor the gas pressure. The filter mechanism is used to filter the extracted gas. The housing is provided with a second gas channel, which is connected to the first gas channel; the housing and the connecting block are provided with a first sealing ring at the connection position between the corresponding first gas channel and the second gas channel; The press-in channel includes a first press-in channel disposed on the housing, a second press-in channel disposed on the connecting block, and a third press-in channel disposed on the rivet nose. The first press-in channel, the second press-in channel, and the third press-in channel are connected in sequence along the vertical direction. The end of the conveying channel near the second press-in channel is disposed along the horizontal direction, and the second press-in channel is located at the end of the conveying channel. A clamping plate is provided in the pressing channel, and the clamping plate extends along the pressing direction of the rivet; the clamping plate is movably disposed on the inner wall of the pressing channel for clamping the rivet during the pressing process. The device includes a drive mechanism for moving the pressure rod within the pressing channel. The drive mechanism includes a connecting rod connected to the pressure rod and a driver for moving the connecting rod. A fixing block is fixed to the pressure rod or the connecting rod, and a displacement sensor is used to monitor the position of the fixing block and thus control the displacement of the pressure rod.

2. The integrated multi-functional pressure head device according to claim 1, characterized in that, The drive mechanism includes a guide housing and a fixed base. The lower part of the fixed base is fixed to the housing, and the upper part of the fixed base is located inside the guide housing. A floating cavity is provided inside the guide housing. The top of the fixed base moves relative to the floating cavity. The connecting rod passes through the top of the fixed base.

3. The integrated multi-functional pressure head device according to claim 2, characterized in that, The fixed base is provided with a receiving cavity for accommodating the lower part of the connecting rod and the pressure rod, and the connecting rod has a limiting ring, which is located in the receiving cavity.

4. The integrated multi-functional pressure head device according to claim 3, characterized in that, An elastic element is provided between the fixing block and the limiting ring, and the elastic element is accommodated in the receiving cavity; the outer diameter of the elastic element is larger than the outer diameter of the fixing block, one end of the elastic element acts on the fixing block, and the other end of the elastic element acts on the limiting ring.

5. The integrated multi-functional pressure head device according to claim 4, characterized in that, A pressure-bearing seat is fixed inside the housing. The inner diameter of the pressure-bearing seat is larger than the outer diameter of the fixed block and smaller than the outer diameter of the elastic element. The outer diameter of the pressure-bearing seat is larger than or equal to the outer diameter of the elastic element, so as to contact the elastic element and compress it.

6. The integrated multi-functional pressure head device according to claim 3, characterized in that, The housing has a receiving groove for accommodating the fixing block during pressing, the receiving groove being in communication with the receiving cavity; the pressing channel is located at the bottom of the receiving groove; the housing has a pressurizing channel communicating with the receiving groove, the pressurizing channel being used to increase the air pressure in the receiving groove and the receiving cavity to form an air spring.

7. The integrated multi-functional pressure head device according to claim 6, characterized in that, A second sealing ring is provided in the pressurization channel, and the position of the second sealing ring is lower than the position of the pressurization channel; the second sealing ring is used to cooperate with the pressure rod to seal so that the receiving groove and the receiving cavity form a sealed space.

Images