Error-proof mechanism for rivet pressing and riveting of mold

Abstract

The utility model relates to an error-proofing mechanism for rivet pressing of a die, the error-proofing mechanism is embedded in a lower die plate of the die, the error-proofing mechanism comprises a female die sleeve, an open hole for a rivet to be detected to penetrate through is formed in the female die sleeve in a penetrating manner, and an ejector assembly is arranged in the open hole from bottom to top; a plurality of sets of push rod assemblies are arranged on the female die sleeve in parallel at intervals in the mode of being perpendicular to the open hole, at least one sensor is arranged corresponding to each set of push rod assembly, and the push rod assemblies are used for being pushed by the rivets or the ejector assemblies to trigger the corresponding sensors. The rivet error-proofing mechanism has the advantages that the rivet can be accurately detected through the error-proofing mechanism, equipment damage or production accidents caused by the fact that the rivet is too long or too short or does not conform to specifications are effectively prevented, safety in the production process is guaranteed, potential risks caused by error operation are reduced, and production efficiency is improved. And meanwhile, mistaken and neglected rivet loading in production can be effectively recognized, the number of defective products is reduced, and the reject ratio is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of riveting jigs, in particular to an anti-error mechanism for riveting rivets in a mold. Background Art

[0002] The existing riveting jig has strict requirements on the length tolerance of the rivet after it is riveted into the product. The length of the riveting screw needs to be checked before and after production, but it takes a lot of manpower to check whether the riveting is in place, and the efficiency of manual inspection is low. The commonly used detection method is: install a proximity switch in the hole corresponding to the rivet on the lower template of the mold, and the proximity switch is placed coaxially with the rivet. However, this solution can only detect the presence or absence of the rivet, and cannot detect rivets that are too short or too small. If a rivet that is too long is placed in the mold by mistake, the proximity switch will be damaged, causing economic losses. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an error-proof mechanism for mold riveting rivets, which is aimed at the rivet mold riveting process and can identify the rivet specifications before riveting, prevent production errors, and avoid damage to molds, sensors and products during production.

[0004] The utility model solves the above technical problems with the following technical solutions: an anti-error mechanism for mold riveting rivets, the anti-error mechanism is embedded in the lower mold plate of the mold, and comprises: a die sleeve, the die sleeve is provided with an opening for the rivet to be tested to pass through, and a ejector assembly is arranged from bottom to top in the opening;

[0005] The die sleeve is provided with a plurality of push rod assemblies at intervals and in parallel with the openings, each push rod assembly being provided with at least one sensor. The push rod assemblies are used to be pushed by the rivets or the ejector assemblies to trigger the corresponding sensors.

[0006] The beneficial effects of the utility model are as follows: accurate detection of rivets can be achieved through the error-proofing mechanism, effectively preventing equipment damage or production accidents caused by rivets that are too long, too short or do not meet specifications, ensuring safety in the production process, reducing potential risks caused by incorrect operations, and at the same time being able to effectively identify the problems of incorrect or missing rivets in production, reducing the number of defective products and the defective rate; the error-proofing mechanism is directly embedded in the lower template of the mold, making installation and disassembly simple and quick.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, a pad is provided below the die sleeve.

[0009] The beneficial effect of adopting the above further solution is that the concave mold plate provides installation space for the ejector assembly.

[0010] Furthermore, the ejector assembly includes: an ejector and an ejector spring, wherein the ejector spring is arranged below the ejector, and a portion of the ejector penetrates into the opening from bottom to top.

[0011] The beneficial effect of adopting the above further solution is that when the ejector spring is compressed, it can reduce the impact and vibration while providing restoring power for the ejector, so that the ejector can return to the initial position after measurement.

[0012] Furthermore, the ejector comprises: a head and a rod, the diameter of the head is larger than the diameter of the rod, the rod is provided with at least one concave diameter-changing section, and the rod penetrates into the opening from the lower end surface of the opening;

[0013] The ejector spring and the head are arranged in a connecting hole opened on the pad.

[0014] The beneficial effect of adopting the above-mentioned further scheme is: by providing an inwardly concave reducing section on the rod of the ejector, the push rod assembly is pushed through the transition of the reducing section, thereby triggering the corresponding sensor, thereby realizing the measurement of the over-long rivet, thereby avoiding safety accidents caused by improper position of the workpiece or excessively long rivets, and improving the safety and reliability of the production process.

[0015] Further, the push rod assembly is provided with two groups;

[0016] A push rod assembly is respectively arranged in the die sleeves on both sides of the opening, and the two push rod assemblies located on both sides of the die sleeve form a group, and the two push rod assemblies in a group of push rod assemblies are arranged in a collinear manner.

[0017] The beneficial effects of adopting the above further scheme are: by arranging push rod assemblies in the die sleeves on both sides of the opening, the size of the installed rivets can be measured; by arranging two groups of push rod assemblies at intervals along the height difference of the die sleeve, the rivets that are too short, too small, too long and of normal size can be measured, thereby preventing product errors.

[0018] Furthermore, the push rod assembly includes: a push rod, a push rod spring and a push rod head, the push rod head is arranged on the push rod, a convex edge is arranged on the push rod, and the push rod spring is sleeved on the push rod between the convex edge and the push rod head.

[0019] The beneficial effect of adopting the above further solution is that when the push rod is pushed by the rivet, the push rod spring provides the push rod with power to return to the initial position, while making the structure more stable.

[0020] Furthermore, a stepped hole is provided on the die sleeve at a position corresponding to the push rod assembly, and the stepped hole is connected to the opening;

[0021] A first stepped hole, a second stepped hole and a third stepped hole are sequentially arranged on the die sleeve from the side wall of the die sleeve toward the opening;

[0022] The anti-retraction push rod head is arranged in the first stepped hole, the end of the convex edge close to the opening is abutted against the end of the second stepped hole away from the third stepped hole, the convex edge and the push rod spring are arranged in the second stepped hole, and the tail end of the push rod is arranged in the third stepped hole.

[0023] The beneficial effect of adopting the above further solution is that the setting of the stepped hole provides installation space for the push rod assembly, so that each part of the push rod assembly can be accurately installed in its corresponding stepped hole, thereby ensuring the accuracy and stability of the push rod assembly.

[0024] Furthermore, a sensor is provided corresponding to the position of any one of the push rod assemblies in each group of the push rod assemblies, and the sensor is provided on the side wall of the die sleeve.

[0025] The beneficial effect of adopting the above further solution is that it is conducive to reasonable layout of devices and reduces occupied space.

[0026] Furthermore, one end of the push rod facing away from the opening extends out of the stop push rod head and is used to trigger the corresponding sensor.

[0027] The beneficial effect of adopting the above further solution is that when the rivet pushes the push rod assembly to move away from the hole, the push rod can extend the stop push rod head to trigger the sensor.

[0028] Further, the sensor located at the top is defined as a first sensor, and the push rod matched with the first sensor is used to be pushed by the rivet of normal size or overlong to trigger the first sensor;

[0029] The sensor located below is defined as a second sensor, and the push rod cooperating with the second sensor is used to be pushed by the ejector to trigger the second sensor.

[0030] The beneficial effect of adopting the above further scheme is that by respectively setting the first sensor and the second sensor, it is possible to accurately distinguish between rivets of normal size and rivets that are too long, too short or too small, while also achieving the effect of preventing leakage. Once the rivet pushes the push rod assembly to move in contact with the sensor, the sensor is immediately triggered, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1The utility model is a schematic diagram of the overall structure of an embodiment.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Rivet; 2. Steel plate; 3. Push rod assembly; 4. Die sleeve; 5. Ejector assembly; 6. Ejector; 7. Ejector spring; 8. Pad; 9. Push rod head; 10. Push rod; 11. Push rod spring; 12. First sensor; 13. Second sensor; 14. Variable diameter section. DETAILED DESCRIPTION

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] like Figure 1 As shown, the utility model provides an error-proofing mechanism for die-pressed riveting rivets. The error-proofing mechanism is mainly used for error-proofing of riveting process of new energy battery pack PACK (i.e. battery pack packaging, encapsulation and assembly). The rivet 1 is detected by the error-proofing mechanism. When in use, the complete error-proofing mechanism can be embedded in the lower template of the mold. The mold is a mold for press-riveting rivets 1, usually called a riveting mold or a press-riveting mold, which is generally installed on a punch press for work. The principle of the press-riveting process is to pass the rivet 1 through the pre-opened plate and embed the teeth on the flange surface of the rivet 1 into the plate by pressure. The error-proofing mechanism specifically includes: a die sleeve 4, a hole is provided on the die sleeve 4 for the rivet 1 to be tested to pass through, wherein the hole is opened in the vertical direction and is located in the middle of the die sleeve 4, and a pusher assembly 5 is inserted from bottom to top in the hole. When an overlong rivet 1 is loaded, the pusher assembly 5 moves downward by the lower end of the rivet 1, thereby triggering the sensor. At the same time, multiple groups of push rod assemblies 3 are arranged in parallel and spaced along the direction perpendicular to the opening on the die sleeve 4, and at least one sensor is arranged on the die sleeve 4 corresponding to the position of each group of push rod assemblies 3. During operation, the push rod assembly 3 is pushed by the rivet 1 or the ejector assembly 5 to trigger the corresponding sensor. It can be imagined that the sensor signal can be connected to a PLC or a relay, and the machine tool movement and alarm can be logically controlled through the PLC or the relay to achieve the purpose of error prevention of the rivet 1; wherein the structure can be connected to a PLC or a relay, and the action of receiving the sensor signal and controlling and alarming through the PLC or the relay is a prior art. According to actual needs, those skilled in the art can easily think of programming a program to achieve the corresponding effect and thus realize the above work, which will not be repeated here.

[0036] In this embodiment, the error-proofing mechanism is a small tooling, and the component to be detected is a structure formed by connecting a rivet 1 and a steel plate 2; during the detection process, the rivet 1 is inserted into the opening from the top of the die sleeve 4, and the steel plate 2 is located between the rivet 1 and the upper end surface of the die sleeve 4. When a rivet 1 that is too short or too small is installed, the rivet 1 cannot trigger the corresponding push rod assembly 3, and then the sensor corresponding to the push rod assembly 3 is not connected, and the machine tool cannot start normally; when a rivet 1 that is too long is installed, the rivet 1 that is too long will press down the ejector assembly 5, causing the ejector assembly 5 to move and trigger the corresponding push rod assembly 3. During this process, the overlong screw will also trigger multiple groups of push rod assemblies 3 located above the push rod assembly 3 corresponding to the ejector assembly 5, and then trigger the corresponding sensor. At this time, the sensor corresponding to the ejector assembly 5 is triggered, and the signal is transmitted to the PLC or relay to control the machine tool to stop and alarm. Only when the correct rivet 1 is loaded into the die sleeve 4, the machine tool can be started normally; at the same time, when the rivet 1 is not loaded into the die sleeve 4, the sensor cannot be triggered and the machine tool will not be able to move, thus achieving the effect of preventing leakage.

[0037] The error-proofing mechanism can realize accurate detection of rivet 1, effectively prevent equipment damage or production accidents caused by rivet 1 being too long, too short or not meeting specifications, ensure safety in the production process, reduce potential risks caused by incorrect operation, and effectively identify the problem of wrong or missing installation of rivet 1 in production, reduce the number of defective products, and reduce the defective rate; the error-proofing mechanism is directly embedded in the lower template of the mold, making installation and disassembly simple and quick; automatic control and alarm functions are realized through an external PLC or relay, and the automatic detection and instant feedback mechanism enable the production line to quickly identify and handle unqualified rivets 1, avoiding production delays caused by manual inspection errors or omissions, and reducing the time of downtime, debugging and rework caused by rivet 1 not meeting specifications, thereby improving overall production efficiency.

[0038] Specifically, a backing plate 8 is further provided below the die sleeve 4 , and the backing plate 8 is a component of the die main body, and the die plate provides an installation space for the ejector assembly 5 .

[0039] like Figure 1 As shown, the ejector assembly 5 includes: an ejector 6 and an ejector spring 7, the ejector spring 7 is arranged below the ejector 6, and part of the ejector 6 is inserted into the opening from the bottom of the opening; the corresponding push rod assembly 3 is pushed by the movement of the part of the ejector 6 that penetrates into the opening, thereby triggering the corresponding sensor, and the ejector spring 7 is compressed in the process, which can reduce the impact and vibration while providing a restoring force for the ejector 6, so that the ejector 6 can return to the initial position after measurement.

[0040] like Figure 1As shown, in the preferred embodiment, the ejector 6 includes: a head and a rod, the diameter of the head is larger than the diameter of the rod, the ejector 6 is arranged in an inverted T shape as a whole, and the rod is inserted into the opening from the lower end face of the opening, and the ejector spring 7 and the head are arranged in the connecting hole opened on the pad 8. It can be imagined that the connecting hole is arranged corresponding to the opening.

[0041] In addition, at least one concave reducing section 14 is provided on the rod. The normal size of the rod except the reducing section 14 is similar to the size of the opening. When the ejector 6 is pressed down and moved by the overly long rivet 1, it transitions from the concave reducing section 14 to the rod at the normal size value, which pushes the push rod assembly 3 and triggers the corresponding sensor. At the same time, due to the setting of the head of the ejector 6, under the action of the ejector spring 7, the ejector 6 returns to its initial position. When it moves to the point where the head abuts against the lower end surface of the die sleeve 4, the ejector 6 will not move, which further limits the position of the ejector 6.

[0042] In the above scheme, an inwardly concave reducing section 14 is provided on the rod portion of the ejector 6, and the push rod assembly 3 is pushed by the transition of the reducing section 14, thereby triggering the corresponding sensor, thereby realizing the measurement of the overlong rivet 1, thereby avoiding safety accidents caused by improper position of the workpiece or excessive length of the rivet 1, and improving the safety and reliability of the production process.

[0043] In this embodiment, if Figure 1 As shown, there are two groups of push rod assemblies 3, one push rod assembly 3 is respectively arranged in the die sleeve 4 on both sides of the opening, and the push rod assemblies 3 located on the left and right sides of the opening are a group of push rod assemblies 3. The two push rod assemblies 3 in a group of push rod assemblies 3 are arranged in a collinear manner. Correspondingly, a sensor can be arranged for each push rod assembly 3 or each group of push rod assemblies 3; the first group of push rod assemblies 3 is arranged corresponding to the tail end position after a normal rivet 1 is placed in the opening, at which position the push rod assembly 3 can be just pushed by a rivet 1 of normal size; the second group of push rod assemblies 3 is arranged corresponding to the variable diameter section 14 of the ejector 6. It can be imagined that as an alternative solution, multiple groups of push rod assemblies 3 can be arranged at intervals along the height difference of the die sleeve 4 to achieve measurement of different sizes of rivets 1, or when the rivet 1 is deformed, measurement is achieved through the sensor corresponding to each push rod assembly 3, which is not limited here.

[0044] In the above scheme, by arranging the push rod assembly 3 in the die sleeve 4 on both sides of the opening, the size of the installed rivet 1 can be measured; by arranging two groups of push rod assemblies 3 at intervals along the height difference of the die sleeve 4, the rivets 1 that are too short, too small, too long and of normal size can be measured to prevent product errors.

[0045] like Figure 1As shown, in the preferred solution, the push rod assembly 3 includes: a push rod 10, a push rod spring 11 and a push rod head 9, the push rod head 9 is sleeved on the push rod 10, a convex edge is provided on the push rod 10, and a push rod spring 11 is sleeved on the push rod 10 between the convex edge and the push rod head 9. When the push rod 10 is pushed by the rivet 1, the push rod spring 11 provides the push rod 10 with power to return to the initial position, and at the same time makes the structure more stable.

[0046] In order to realize the installation of the push rod assembly 3 and the die sleeve 4, as Figure 1 As shown, a stepped hole is provided at a position of the die sleeve 4 corresponding to the push rod assembly 3, and a push rod assembly 3 is installed through a stepped hole. The stepped hole is connected with the opening, so that after a normal or overlong rivet 1 is installed, the rivet 1 can directly push the push rod 10 to move away from the hole. Specifically, a first stepped hole, a second stepped hole and a third stepped hole are sequentially provided on the die sleeve 4 from one side wall of the die sleeve 4 to the direction close to the opening, and the aperture of the first stepped hole is larger than the aperture of the second stepped hole, and the aperture of the third stepped hole is larger than the aperture of the third stepped hole. The anti-retreat push rod head 9 is arranged in the first step hole, and the anti-retreat push rod head 9 is threadedly connected to the first step hole, the end of the convex edge close to the opening is abutted against the end of the second step hole away from the third step hole, the convex edge and the push rod spring 11 are arranged in the second step hole, and the position of the convex edge is also limited, ensuring that the initial position returned to by the push rod 10 under the action of the push rod spring 11 is fixed, and the tail end of the push rod 10 located at the end of the convex edge away from the anti-retreat push rod head 9 is arranged in the third step hole, and the third step hole is connected to the opening.

[0047] In the above solution, the setting of the stepped hole provides installation space for the push rod assembly 3, so that each part of the push rod assembly 3 can be accurately installed in the corresponding stepped hole, thereby ensuring the accuracy and stability of the push rod assembly 3.

[0048] In some feasible embodiments, a sensor is respectively provided at the position of any push rod assembly 3 in each group of push rod assemblies 3, and the sensor is provided on the side wall of the die sleeve 4. In the actual working process, the sensors provided for each group of push rod assemblies 3 can be provided on the same side of the die sleeve 4; it can be imagined that the setting position of the sensor relative to the die sleeve 4 can be adjusted as needed, which is more conducive to the reasonable arrangement of the device and reduces the occupied space.

[0049] In a further solution, a hole is provided on the anti-retraction push rod head 9 for the push rod 10 to pass through, and the end of the push rod 10 facing away from the hole can extend out of the anti-retraction push rod head 9. When the rivet 1 pushes the push rod assembly 3 to move away from the hole, the push rod 10 can extend out of the anti-retraction push rod head 9 and trigger the sensor.

[0050] Among them, the sensor located above is defined as the first sensor 12, and the first sensor 12 is set corresponding to the position of the push rod assembly 3 located above and in contact with the rivet 1 of normal size. The push rod 10 is pushed by the rivet 1 of normal size to move and trigger the first sensor 12.

[0051] The sensor located at the bottom is defined as the second sensor 13, and the second sensor 13 is arranged at the position of the push rod assembly 3 located at the bottom and arranged corresponding to the diameter-reducing section 14 of the ejector 6. The overlong rivet 1 pushes the ejector 6 to move the push rod 10 and triggers the second sensor 13. In some feasible embodiments, the first sensor 12 and the second sensor 13 can be, but are not limited to, contact sensors, such as micro switches.

[0052] In the above scheme, by respectively setting the first sensor 12 and the second sensor 13, it is possible to accurately distinguish between rivets 1 of normal size and rivets 1 that are too long, too short or too small, while also achieving the effect of preventing leakage. Once the rivet 1 pushes the push rod assembly 3 to move in contact with the sensor, the sensor is immediately triggered, and the PLC or relay can respond quickly and perform subsequent operations, thereby improving production efficiency; the use of a contact sensor such as a micro switch can directly sense the movement of the push rod 10 and provide an accurate and reliable trigger signal.

[0053] The specific working process is:

[0054] 1. When the rivet 1 of the correct size is installed in the die sleeve 4, the upper group of push rods 10 will move away from the two sides of the hole, triggering the first sensor 12 to turn on, and the ejector 6 reserves a smaller diameter reducing section 14, so that the lower group of push rods 10 does not move. When the first sensor 12 is turned on and the second sensor 13 is not turned on, the machine tool can be started normally.

[0055] 2. When a rivet 1 that is too small is installed, the rivet 1 cannot push away the upper set of push rods 10, resulting in the first sensor 12 not being connected and the machine tool failing to start normally.

[0056] 3. When a rivet 1 that is too short is installed, the rivet 1 cannot push away the upper set of push rods 10, resulting in the first sensor 12 not being connected and the machine tool failing to start normally.

[0057] 4. When an overlong rivet 1 is loaded, since the initial position of the ejector 6 remains unchanged when the equipment is not working, the overlong rivet 1 will protrude from the surface of the die sleeve 4 a distance higher than the correct rivet 1 when loaded into the die sleeve 4. If the rivet 1 is loaded downward manually, the ejector 6 will move downward with the rivet 1, causing the larger diameter portion at the upper end of the ejector 6 to push away the lower group of push rods 10, thereby triggering the second sensor 13 to turn on. When the second sensor 13 is turned on, the machine tool will immediately stop working and alarm. If the overlong rivet 1 is not found in front of the rivet 1, during the riveting process, the rivet 1 presses down the ejector 6, causing the ejector 6 to move downward, thereby pushing the lower group of push rods 10 to trigger the second sensor 13. The signal of the second sensor 13 is transmitted to the machine tool, and the machine tool stops and alarms.

[0058] 5. The opening diameter at the center of the die sleeve 4 corresponds to the diameter of the rivet 1 of the correct specification. When a rivet 1 with a diameter that is too large appears, it cannot be loaded into the die sleeve 4.

[0059] 6. When the rivet 1 is not loaded into the die sleeve 4, the first sensor 12 fails to be triggered and the machine tool cannot move, thus achieving the effect of preventing leakage.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An anti-error mechanism for die riveting rivets, the anti-error mechanism is embedded in the lower mold plate of the die, characterized in that: include: A die sleeve (4), wherein the die sleeve (4) is provided with an opening through which the rivet (1) to be tested is inserted, and a ejector assembly (5) is arranged in the opening from bottom to top; A plurality of push rod assemblies (3) are arranged on the die sleeve (4) in parallel and at intervals perpendicular to the opening, and at least one sensor is arranged corresponding to each group of the push rod assemblies (3). The push rod assemblies (3) are used to be pushed by the rivet (1) or the ejector assembly (5) to trigger the corresponding sensor.

2. According to claim 1, an anti-error mechanism for die-pressed rivets is characterized in that: A backing plate (8) is also provided below the die sleeve (4).

3. The anti-error mechanism for die-pressed rivets according to claim 2, characterized in that: The ejector assembly (5) comprises: an ejector (6) and an ejector spring (7), wherein the ejector spring (7) is arranged below the ejector (6), and a portion of the ejector (6) penetrates into the opening from bottom to top.

4. The anti-error mechanism for die-stitched rivets according to claim 3, characterized in that: The ejector (6) comprises: a head and a rod, the diameter of the head is larger than the diameter of the rod, the rod is provided with at least one concave diameter-changing section (14), and the rod penetrates into the opening from the lower end surface of the opening; The ejector spring (7) and the head are arranged in a connecting hole opened on the pad (8).

5. The error-proofing mechanism for die-pressed rivets according to claim 1, characterized in that: The push rod assembly (3) is provided with two groups; A push rod assembly (3) is respectively arranged in the die sleeve (4) on both sides of the opening, and the two push rod assemblies (3) located on both sides of the die sleeve (4) form a group, and the two push rod assemblies (3) in a group of push rod assemblies (3) are arranged in a colinear manner.

6. The anti-error mechanism for die-stitched rivets according to claim 5, characterized in that: The push rod assembly (3) comprises: a push rod (10), a push rod spring (11) and a push rod head (9); the push rod head (9) is arranged on the push rod (10); a convex edge is arranged on the push rod (10); and the push rod spring (11) is sleeved on the push rod (10) between the convex edge and the push rod head (9).

7. The error-proofing mechanism for die-pressed rivets according to claim 6, characterized in that: A stepped hole is provided on the die sleeve (4) at a position corresponding to the push rod assembly (3), and the stepped hole is connected to the opening; A first stepped hole, a second stepped hole and a third stepped hole are sequentially arranged on the die sleeve (4) from the side wall of the die sleeve (4) toward the direction close to the opening; The anti-retraction push rod head (9) is arranged in the first stepped hole, the end of the convex edge close to the opening is in contact with the end of the second stepped hole away from the third stepped hole, the convex edge and the push rod spring (11) are arranged in the second stepped hole, and the tail end of the push rod (10) is arranged in the third stepped hole.

8. An anti-error mechanism for die-pressed rivets according to claim 6 or 7, characterized in that: One sensor is provided corresponding to the position of any one of the push rod assemblies (3) in each group of the push rod assemblies (3), and the sensor is provided on the side wall of the die sleeve (4).

9. The error-proofing mechanism for die-stitched rivets according to claim 8, characterized in that: One end of the push rod (10) facing away from the opening extends out of the stop push rod head (9) and is used to trigger the corresponding sensor.

10. The error-proofing mechanism for die-pressed rivets according to claim 8, characterized in that: The sensor located at the top is defined as a first sensor (12), and the push rod (10) matched with the first sensor (12) is used to be pushed by the rivet (1) of normal size or excessive length to trigger the first sensor (12); The sensor located at the bottom is defined as a second sensor (13), and the push rod (10) cooperating with the second sensor (13) is used to be pushed by the ejector (6) to trigger the second sensor (13).

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