Riveting press

Abstract

The squeeze riveter comprises an upper die assembly, a lower die assembly, a distance sensor, a contact sensor and a control unit, the distance sensor and the contact sensor are arranged on the upper die assembly, and the driving state of a driving mechanism can be controlled through signal interaction between the distance sensor and the control unit and signal interaction between the contact sensor and the control unit. When the squeeze riveter operates normally and a foreign matter exists on a downward pressing path of the upper die assembly, the contact sensor sends out a first electric signal, meanwhile, the difference value between L measured by the distance sensor and a preset distance L0 is larger than a preset value, and the control unit controls the driving mechanism to enable the upper die assembly to be lifted. Therefore, the risk that an operator operates the upper die assembly by mistake can be avoided, and potential safety hazards are reduced when the operator uses equipment.

Description

Technical Field

[0001] This application belongs to the field of assembly equipment technology, and in particular relates to a riveting machine. Background Technology

[0002] In existing technologies, riveting machines mainly consist of three parts: a power system, a mold assembly, and a control system. The power system provides the pressure source, and common forms include hydraulic drive, pneumatic drive, or servo electric drive; the mold is divided into an upper mold assembly and a lower mold assembly, which are customized according to the shape of the rivet; the control system is responsible for pressure regulation and the operation process.

[0003] During operation, the operator places the pre-assembled workpiece in the riveting area of ​​the lower die assembly, inserts the rivet, and starts the equipment. The power system then pushes the upper die downwards, and the precisely controlled pressure causes the rivet shank to compress and deform. Under the constraint of the die, the tail of the rivet expands to form a head, while the rivet body fits tightly against the wall of the connecting part hole, forming a mechanical interlocking structure.

[0004] In existing riveting machines, if operators accidentally press their fingers when placing pre-installed workpieces or rivets on the upper die, there is a risk of injury, posing a certain safety hazard. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a riveting machine in order to overcome the above-mentioned shortcomings of existing riveting machines.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A riveting machine, comprising:

[0008] The upper mold assembly can be pressed down or lifted under the drive of the drive mechanism;

[0009] A lower mold assembly is provided correspondingly to the upper mold assembly; the lower mold assembly has a riveting area for placing products and / or rivets, and also has a detection point; the riveting area is located on the path of the upper mold assembly pressing down;

[0010] A distance sensor, connected to the upper mold assembly, is capable of measuring the distance L between the distance sensor and the detection point;

[0011] A contact sensor is connected to the upper mold assembly. During the pressing down of the upper mold assembly, the contact sensor can contact an object located on the pressing path of the upper mold assembly to generate a first electrical signal.

[0012] The control unit is used to control the driving state of the driving mechanism. The control unit is electrically connected to the distance sensor and the contact sensor. When the control unit receives the first electrical signal, if the difference between the distance L measured by the distance sensor and the preset distance L0 is greater than a preset value, the control unit controls the driving mechanism to raise the upper mold assembly. If the difference between the distance L measured by the distance sensor and the preset distance L0 is less than or equal to the preset value, the control unit controls the driving mechanism to press down the upper mold assembly.

[0013] Preferably, in the riveting machine of this utility model, the upper die assembly includes: an upper die assembly body, an upper die punch, an upper die clamp, and an elastic element;

[0014] The upper die punch is connected to the upper die assembly body via the upper die clamp. The upper die punch is fixed to the upper die clamp, and the upper die clamp is movably connected to the upper die assembly body. The elastic element is connected between the upper die clamp and the upper die assembly body.

[0015] The contact sensor is installed on the upper die clamp; during the pressing process of the upper die assembly, when the upper die punch abuts against the object, the upper die punch can move in the opposite direction of the pressing direction of the upper die assembly to generate the first electrical signal by the contact sensor and deform the elastic element.

[0016] Preferably, in the riveting machine of this utility model, the contact sensor is a proximity switch, which can sense the upper mold assembly body and generate the first electrical signal when the contact sensor senses proximity to the upper mold assembly body.

[0017] Preferably, in the riveting machine of this utility model, one end of the upper die clamp is sleeved on the upper die assembly body, and the other end is fixed to the upper die punch. The elastic element is installed inside the upper die clamp, and the two ends of the elastic element abut against the inner wall of the upper die clamp and the end of the upper die assembly body, respectively.

[0018] Preferably, the riveting machine of this utility model further includes:

[0019] At least one feeding tray for conveying the rivets;

[0020] A material-grabbing robot is used to grab the rivet from the loading tray and place it in the riveting area.

[0021] Preferably, in the riveting machine of this utility model, the material gripping robot includes a clamping part, a rotating shaft, and a telescopic drive. The clamping part is used to clamp the rivet, the rotating shaft is used to drive the clamping part to rotate so that the clamping part reciprocates along a first path, and the telescopic drive is used to drive the clamping part to move along the normal direction of the first path.

[0022] At least two feeding trays are arranged along the second path, which is parallel to the first path.

[0023] Preferably, in the riveting machine of this utility model, one of the feeding trays includes:

[0024] At least two rows of feeding tracks, along which the rivets can be arranged;

[0025] A vibrating feeder is used to drive the feeding track to vibrate so that the rivet moves from the feed end of the feeding track to the discharge end of the feeding track.

[0026] Preferably, the riveting machine of this utility model further includes a pressure sensor, which is electrically connected to the control unit; the pressure sensor is used to monitor the pressure applied by the upper die assembly to the rivet, and when the pressure reaches the set pressure, the control unit controls the drive mechanism to lift the upper die assembly.

[0027] Preferably, in the riveting machine of this utility model, the driving mechanism includes a pneumatic-hydraulic booster cylinder and a solenoid valve. The pneumatic-hydraulic booster cylinder is connected to the upper mold assembly to drive the upper mold assembly to press down or lift. The pneumatic-hydraulic booster cylinder is also connected to the solenoid valve, and the air intake direction of the pneumatic-hydraulic booster cylinder is controlled by the solenoid valve. The solenoid valve is electrically connected to the control unit. When the pressure detected by the pressure sensor reaches the set pressure, the control unit controls the solenoid valve to reverse the air intake direction of the pneumatic-hydraulic booster cylinder, so that the driving direction of the pneumatic-hydraulic booster cylinder changes to the opposite direction.

[0028] Preferably, the riveting machine of this utility model further includes a data storage unit, which is used to store the operating parameters of the riveting machine. The storage unit is electrically connected to the control unit, and the control unit can update the value of the set pressure when reading the operating parameters in the storage unit.

[0029] The beneficial effects of this invention are as follows: The upper mold assembly is equipped with a distance sensor and a contact sensor. These sensors interact with the control unit to control the driving state of the drive mechanism. When the riveting machine is operating normally, simultaneously with the contact sensor emitting a first electrical signal, the difference between the distance sensor's measured distance L and the preset distance L0 will be less than or equal to a preset value. In this case, the control unit controls the drive mechanism to press the upper mold assembly down normally. Conversely, when a foreign object is present in the path of the upper mold assembly's downward movement, simultaneously with the contact sensor emitting a first electrical signal, the difference between the distance sensor's measured distance L and the preset distance L0 will be greater than the preset value. In this case, the control unit controls the drive mechanism to raise the upper mold assembly. Therefore, this invention can avoid the risk of operator error in operating the upper mold assembly and reduce safety hazards when using the equipment. Attached Figure Description

[0030] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a perspective view of the riveting machine structure according to an embodiment of this application;

[0032] Figure 2 This is a front view of the riveting machine structure according to an embodiment of this application;

[0033] Figure 3 This is a partial enlarged view of the front view of the riveting machine structure according to an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the acquisition state of the preset distance L0 of the riveting machine according to an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the distance sensor measuring the L state when the riveting machine is in use according to an embodiment of this application;

[0036] Figure 6 This is a top view of the riveting machine structure according to an embodiment of this application;

[0037] Figure 7 yes Figure 6 A partial enlarged view of the AA section view;

[0038] Figure 8 This is a perspective view of the material-grabbing robot structure according to an embodiment of this application;

[0039] Figure 9 This is a schematic diagram of the movement path of the material-grabbing robot according to an embodiment of this application;

[0040] Figure 10 This is a schematic diagram of the feeding tray structure according to an embodiment of this application.

[0041] The attached figures are labeled as follows:

[0042] 1. Upper die assembly; 10. Upper die punch; 11. Upper die assembly body; 12. Upper die clamp; 13. Elastic component;

[0043] 2. Lower mold assembly; 21. Riveting area; 22. Detection point;

[0044] 3. Distance sensor;

[0045] 4. Contact sensor;

[0046] 5. Feeding tray; 51. Feeding track;

[0047] 6. Material handling robot; 61. Gripping part; 62. Rotating shaft; 63. Telescopic drive component; 64. First path; 65. Second path;

[0048] 7. Gas-liquid booster cylinder. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0050] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not 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 limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] This embodiment provides a riveting machine, such as Figures 1-3 As shown, it includes: upper mold assembly 1, lower mold assembly 2, distance sensor 3, contact sensor 4, and control unit.

[0054] The upper mold assembly 1 can be pressed down or raised under the drive of the drive mechanism; the lower mold assembly 2 is set correspondingly to the upper mold assembly 1; the lower mold assembly 2 has a riveting area 21 for placing the product and / or rivets, and also has a detection point 22; the riveting area 21 is located on the path of the upper mold assembly 1 pressing down. After the riveting machine is started, when the product and rivets are placed in the riveting area 21, the operator operates the upper mold assembly 1 to press down. Under the combined action of the upper mold assembly 1 and the lower mold assembly 2, the rivets are deformed by force and rivet the product together.

[0055] Distance sensor 3 is connected to upper mold assembly 1. Distance sensor 3 can measure the distance L between distance sensor 3 and detection point 22. Contact sensor 4 is connected to upper mold assembly 1. Contact sensor 4 can contact an object located on the path of upper mold assembly 1 during the pressing process of upper mold assembly 1 and generate a first electrical signal.

[0056] The control unit is used to control the driving state of the driving mechanism. In other words, in addition to the operator actively controlling the upper mold assembly 1 to press down or move onto the platform, the control unit can also use its control capabilities to intervene in the driving state of the driving mechanism. For example, during the operator's active control process, the control unit can terminate the user's operation command and give the driving mechanism a new driving command.

[0057] The control unit is electrically connected to the distance sensor 3 and the contact sensor 4. When the control unit receives the first electrical signal, if the difference between the distance L measured by the distance sensor 3 and the preset distance L0 is greater than the preset value, it indicates that the value of L when contacting the object is abnormal, indicating that there is an abnormal situation. Therefore, the control unit controls the drive mechanism to raise the upper mold assembly 1. If the difference between the distance L measured by the distance sensor 3 and the preset distance L0 is less than or equal to the preset value, it indicates that the value of L when contacting the object is normal, and therefore the working state of the device is normal. The control unit controls the drive mechanism to press down the upper mold assembly 1.

[0058] As can be seen, the riveting machine provided in this embodiment has a distance sensor 3 and a contact sensor 4 on the upper die assembly 1. The distance sensor 3 and contact sensor 4 can interact with the control unit to control the driving state of the drive mechanism. When the riveting machine is operating normally, at the same time the contact sensor 4 emits a first electrical signal, the difference between the distance L measured by the distance sensor 3 and the preset distance L0 will be less than or equal to a preset value. Then, the control unit controls the drive mechanism to press the upper die assembly 1 down normally. However, when a foreign object is present in the path of the upper die assembly 1, at the same time the contact sensor 4 emits a first electrical signal, the difference between the distance L measured by the distance sensor 3 and the preset distance L0 will be greater than the preset value. Then, the control unit controls the drive mechanism to raise the upper die assembly 1. Therefore, this utility model can avoid the risk of operator misoperation of the upper die assembly 1 and reduce safety hazards when operators use the equipment.

[0059] In this embodiment, a method for obtaining L0 is provided, such as... Figure 4 As shown, using a pre-measurement method, without placing any objects in the riveting area 21, the operator actively operates the upper mold assembly 1 to press down normally, recording the distance value measured by the distance sensor 3, which is defined as L0. Since the thickness of the product to be riveted is basically fixed, a preset value can be manually set. By comparing the difference between L and the preset distance L0 with the preset value, it can be determined whether the equipment comes into contact with foreign objects during the pressing process. For example, when the product thickness is 2mm, the preset value can be set to 2mm, 2.1mm, 2.5mm, etc., while the thickness of a human finger is generally much greater than 2.5mm, so the preset value can be set to 2.5mm. Under this setting, such as Figure 5 As shown, when a finger is located on the downward pressing path of the upper mold assembly 1, and the upper mold assembly 1 contacts the finger (it should be noted that the pressure of the upper mold assembly 1 is very small during this process, within a safe range, for example, 20KGF), the difference between the distance L measured by the distance sensor 3 and the preset distance L0 may be 5mm, 7mm, 10mm, etc. If it is greater than the preset value of 2.5mm, the control unit controls the drive mechanism to raise the upper mold assembly 1, thus preventing the operator from accidentally pressing the finger with the upper mold assembly 1.

[0060] In an alternative embodiment, such as Figure 6 , Figure 7 As shown, the upper die assembly 1 includes: an upper die assembly body 11, an upper die punch 10, an upper die clamp 12, and an elastic element 13. The upper die punch 10 is connected to the upper die assembly body 11 via the upper die clamp 12. The upper die punch 10 and the upper die clamp 12 are fixed. The upper die clamp 12 is movably connected to the upper die assembly body 11. An elastic element 13 connects the upper die clamp 12 and the upper die assembly body 11.

[0061] Contact sensor 4 is mounted on upper die clamp 12. During the pressing process of upper die assembly 1, when upper die punch 10 comes into contact with the object, upper die punch 10 can move in the opposite direction of pressing direction of upper die assembly 1, causing contact sensor 4 to generate a first electrical signal and deform elastic member 13. It is understood that contact sensor 4 can also be mounted on upper die punch 10.

[0062] In this embodiment, the upper die assembly body 11 and the upper die punch 10 are designed as separate units, allowing the upper die punch 10 to move slightly relative to the upper die assembly body 11. This enables the contact sensor 4 to be triggered upon contact with an object. The elastic element 13 allows the upper die punch 10 to reset at any time after triggering the contact sensor 4, so that it can be used for the next sensing action. This structural design is based on physical structure and has low requirements for the configuration of sensing elements, which helps to reduce costs and sensor failure rate.

[0063] In an alternative embodiment, such as Figure 7 As shown, the contact sensor 4 is a proximity switch capable of sensing the upper mold assembly body 11. When the contact sensor 4 senses proximity to the upper mold assembly body 11, it generates a first electrical signal. In this embodiment, a proximity switch is used as the contact sensor 4 to provide feedback on whether the contact sensor is gradually approaching the upper mold assembly body 11. It can be understood that when the upper mold punch 10 is not in contact with an object, the distance between the proximity switch and the upper mold assembly body 11 remains unchanged, and no first electrical signal is generated. However, when the upper mold punch 10 contacts an object, the distance between the proximity switch and the upper mold assembly body 11 decreases, triggering the proximity switch to generate the first electrical signal.

[0064] Optionally, the proximity switch in this embodiment includes, but is not limited to, inductive proximity switches, capacitive proximity switches, Hall effect proximity switches, and photoelectric proximity switches.

[0065] In an alternative embodiment, such as Figure 7 As shown, one end of the upper die clamp 12 is sleeved on the upper die assembly body 11, and the other end is fixed to the upper die punch 10. An elastic element 13 is installed inside the upper die clamp 12, with both ends of the elastic element 13 abutting against the inner wall of the upper die clamp 12 and the end of the upper die assembly body 11, respectively. In this embodiment, the elastic element 13 is installed inside the upper die clamp 12, which can hide the elastic element 13, providing a certain degree of protection and extending its service life. Optionally, the elastic element 13 can be a spring.

[0066] In an alternative embodiment, such as Figure 1 , Figure 2 , Figure 6As shown, the riveting machine in this embodiment also includes at least one feeding tray 5 and a material-grabbing robot 6. The feeding tray 5 is used to transport rivets, and the material-grabbing robot 6 is used to grab rivets from the feeding tray 5 and place them in the riveting area 21. In this embodiment, a material-grabbing robot 6 capable of automatically feeding rivets is provided, realizing a flexible use mode that combines manual and automatic feeding of the riveting machine. Together with the feeding tray 5, it can continuously supply rivets, improving work efficiency.

[0067] In an alternative embodiment, such as Figure 8 , Figure 9 As shown, the material handling robot 6 includes a gripping part 61, a rotating shaft 62, and a telescopic drive 63. The gripping part 61 is used to clamp rivets, the rotating shaft 62 is used to drive the gripping part 61 to rotate so that the gripping part 61 reciprocates along the first path 64, and the telescopic drive 63 is used to drive the gripping part 61 to move along the normal direction of the first path 64. There are two loading trays 5 arranged along the second path 65, which is parallel to the first path 64. In this embodiment, the material handling robot 6 includes a gripping part 61 that can rotate under the drive of the rotating shaft 62. The gripping part 61 is used to grip or release rivets, thereby picking up and placing the rivets. The gripping part 61 rotates along a first path 64, while the two loading trays 5 are arranged along a second path 65. Since the second path 65 is parallel to the first path 64, the rotation of the gripping part 61 will not interfere with the loading trays 5 when it is not pushed out by the telescopic drive member 63. When the gripping part 61 is aligned with the unloading position of the loading tray 5 in the normal direction of the first path 64, the telescopic drive member 63 pushes it out, and the gripping part 61 moves along the normal direction to the unloading position of the loading tray 5, thereby removing the rivets from the loading tray 5. It can be understood that the number of loading trays 5 can also be 3, 4, or more.

[0068] In an optional embodiment, the riveting area 21 is also provided on the second path 65, which facilitates the clamping part 61 to reach the position.

[0069] In an alternative embodiment, such as Figure 10 As shown, a feeding tray 5 includes at least two rows of feeding tracks 51 and a vibrating feeder. Rivets can be arranged along the feeding tracks 51; the vibrating feeder drives the feeding tracks 51 to vibrate, causing the rivets to move from the feed end to the discharge end of the feeding tracks 51. In this embodiment, by setting multiple feeding tracks 51 on the feeding tray 5, rivets of different specifications can be supplied simultaneously. By using a vibrating feeder to drive the rivet movement, one vibrating feeder can convey rivets on multiple feeding tracks 51, thus improving feeding efficiency.

[0070] In an optional embodiment, the riveting machine further includes a pressure sensor electrically connected to the control unit. The pressure sensor monitors the pressure applied to the rivet by the upper die assembly 1. When the pressure reaches the set pressure, the control unit controls the drive mechanism to lift the upper die assembly 1. In this embodiment, by setting the pressure sensor, the application of pressure to a rivet to be tightened is automatically stopped and reset after the ideal pressure is reached. The pressure is precise, avoiding insufficient or excessive pressure, thus improving the product assembly effect.

[0071] In an alternative embodiment, such as Figure 1 , Figure 2 As shown, the driving mechanism includes a pneumatic-hydraulic booster cylinder 7 and a solenoid valve. The pneumatic-hydraulic booster cylinder 7 is connected to the upper mold assembly 1 to drive the upper mold assembly 1 to press down or lift. The pneumatic-hydraulic booster cylinder 7 is also connected to the solenoid valve, and the air intake direction of the pneumatic-hydraulic booster cylinder 7 is controlled by the solenoid valve. The solenoid valve is electrically connected to the control unit. When the pressure detected by the pressure sensor reaches the set pressure, the control unit controls the solenoid valve to reverse the air intake direction of the pneumatic-hydraulic booster cylinder 7, so that the driving direction of the pneumatic-hydraulic booster cylinder 7 changes to the opposite direction. In this embodiment, the air intake direction of the pneumatic-hydraulic booster cylinder 7 is controlled by a solenoid valve. That is, as long as the air intake direction of the pneumatic-hydraulic booster cylinder 7 is reversed, the driving direction of the pneumatic-hydraulic booster cylinder 7 becomes the opposite direction. Therefore, by connecting the pneumatic-hydraulic booster cylinder 7 to the upper mold assembly 1, the pressing down or lifting of the upper mold assembly 1 is controlled by the solenoid valve, which facilitates the control of the driving mechanism.

[0072] In an optional embodiment, the riveting machine further includes a data storage unit for storing the operating parameters of the riveting machine. The storage unit is electrically connected to the control unit, and the control unit can update the set pressure value when reading the operating parameters from the storage unit. In this embodiment, a riveting parameter database can be established, and the riveting parameters of all hardware parts can be written into the database. During product processing, the riveting parameters are selected according to the hardware part model and the sheet metal model, thereby achieving standardization of the riveting parameters. When a specific hardware part is actually used, the set pressure value recorded in the database can be directly retrieved, allowing operators to easily match the required parameters for the product at any time.

[0073] In an optional embodiment, the control unit described in this embodiment is a PLC, and the electrical signals of each sensor can be converted into digital signals and compared with the values ​​recorded in the PLC database.

[0074] Based on the above-described preferred embodiments according to this application, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A riveting machine, characterized in that, include: The upper mold assembly (1) can be pressed down or lifted under the drive of the drive mechanism; The lower mold assembly (2) is provided corresponding to the upper mold assembly (1); the lower mold assembly (2) has a riveting area (21) for placing products and / or rivets, and also has a detection point (22); the riveting area (21) is located on the path of the upper mold assembly (1) pressing down; A distance sensor (3) is connected to the upper mold assembly (1), and the distance sensor (3) is capable of measuring the distance L between the distance sensor (3) and the detection point (22); A contact sensor (4) is connected to the upper mold assembly (1). The contact sensor (4) can contact an object located on the path of the upper mold assembly (1) during the pressing down process of the upper mold assembly (1) to generate a first electrical signal. The control unit is used to control the driving state of the driving mechanism. The control unit is electrically connected to the distance sensor (3) and the contact sensor (4). When the control unit receives the first electrical signal, if the difference between the distance L measured by the distance sensor (3) and the preset distance L0 is greater than the preset value, the control unit controls the driving mechanism to raise the upper mold assembly (1). If the difference between the distance L measured by the distance sensor (3) and the preset distance L0 is less than or equal to the preset value, the control unit controls the driving mechanism to press down the upper mold assembly (1).

2. The riveting machine according to claim 1, characterized in that, The upper mold assembly (1) includes: upper mold assembly body (11), upper mold punch (10), upper mold clamp (12) and elastic element (13). The upper die punch (10) is connected to the upper die assembly body (11) through the upper die clamp (12). The upper die punch (10) is fixed to the upper die clamp (12). The upper die clamp (12) is movably connected to the upper die assembly body (11). The elastic element (13) is connected between the upper die clamp (12) and the upper die assembly body (11). The contact sensor (4) is installed on the upper die clamp (12); during the pressing process of the upper die assembly (1), when the upper die punch (10) abuts against the object, the upper die punch (10) can move in the opposite direction of the pressing direction of the upper die assembly (1) to generate the first electrical signal of the contact sensor (4) and deform the elastic member (13).

3. The riveting machine according to claim 2, characterized in that, The contact sensor (4) is a proximity switch that can sense the upper mold assembly body (11). When the contact sensor (4) senses proximity to the upper mold assembly body (11), it generates the first electrical signal.

4. The riveting machine according to claim 2, characterized in that, One end of the upper die clamp (12) is sleeved on the upper die assembly body (11), and the other end is fixed to the upper die punch (10). The elastic element (13) is installed inside the upper die clamp (12), and the two ends of the elastic element (13) abut against the inner wall of the upper die clamp (12) and the end of the upper die assembly body (11), respectively.

5. The riveting machine according to any one of claims 1-4, characterized in that, The riveting machine also includes: At least one feeding tray (5) is used to feed the rivets; A material-grabbing robot (6) is used to grab the rivet from the loading tray (5) and place it in the riveting area (21).

6. The riveting machine according to claim 5, characterized in that, The material handling robot (6) includes a gripping part (61), a rotating shaft (62), and a telescopic drive (63). The gripping part (61) is used to clamp the rivet. The rotating shaft (62) is used to drive the gripping part (61) to rotate so that the gripping part (61) moves back and forth along the first path (64). The telescopic drive (63) is used to drive the gripping part (61) to move along the normal direction of the first path (64). At least two of the feeding trays (5) are arranged along the second path (65), which is parallel to the first path (64).

7. The riveting machine according to claim 5, characterized in that, One of the feeding trays (5) includes: At least two rows of feeding tracks (51) are provided, and the rivets can be arranged along the feeding tracks (51); A vibrating feeder is used to drive the feeding track (51) to vibrate so that the rivet moves from the feed end of the feeding track (51) to the discharge end of the feeding track (51).

8. The riveting machine according to any one of claims 1-4, characterized in that, The riveting machine also includes a pressure sensor, which is electrically connected to the control unit. The pressure sensor is used to monitor the pressure applied by the upper die assembly (1) to the rivet. When the pressure reaches the set pressure, the control unit controls the drive mechanism to lift the upper die assembly (1).

9. The riveting machine according to claim 8, characterized in that, The driving mechanism includes a gas-liquid booster cylinder (7) and a solenoid valve. The gas-liquid booster cylinder (7) is connected to the upper mold assembly (1) to drive the upper mold assembly (1) to press down or lift. The gas-liquid booster cylinder (7) is also connected to the solenoid valve. The air intake direction of the gas-liquid booster cylinder (7) is controlled by the solenoid valve. The solenoid valve is electrically connected to the control unit. When the pressure detected by the pressure sensor reaches the set pressure, the control unit controls the solenoid valve to reverse the air intake direction of the gas-liquid booster cylinder (7), so that the driving direction of the gas-liquid booster cylinder (7) changes to the opposite direction.

10. The riveting machine according to claim 8, characterized in that, The riveting machine also includes a data storage unit, which is used to store the operating parameters of the riveting machine. The storage unit is electrically connected to the control unit, and the control unit can update the value of the set pressure when reading the operating parameters in the storage unit.

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