Riveting machine pressure sensor equipment and riveting machine

Abstract

The utility model discloses a riveting machine pressure sensor device and a riveting machine. The riveting machine pressure sensor device comprises a main shaft; the shaft sleeve is arranged on the main shaft in a sleeving manner; the first nut is in threaded connection with the main shaft; the second nut is in threaded connection with the main shaft; the sensor is used for detecting a pressure signal of the riveting machine, converting the pressure signal into an electric signal and outputting the electric signal; wherein the shaft sleeve, the first nut, the sensor and the second nut are sequentially sleeved from one end of the main shaft to the other end of the main shaft, the sensor is integrated in a stress transmission chain of the main shaft, traditional manual experience parameter adjustment is replaced, and closed-loop control over the riveting force threshold value and the speed is achieved through real-time electric signals; through buffer protection of the shaft sleeve, the instantaneous overload risk of the sensor is reduced; the first nut and the second nut can press the sensor assembly in two directions, rigid fixation is formed, and sensor deflection or looseness caused by vibration of the main shaft is restrained.

Description

TECHNICAL FIELD

[0001] The utility model relates to riveting equipment related technical field especially, a kind of riveting machine pressure sensor equipment and riveting machine. BACKGROUND

[0002] In the riveting process field (such as hydraulic riveting, impact riveting), the accurate control of riveting force is the core factor to determine the connection strength and product quality. The traditional riveting equipment generally has the following technical defects:

[0003] 1. Pressure control relies on manual experience: the existing riveting machine mostly adopts mechanical pressure regulation or simple hydraulic feedback system, and the riveting force setting mainly relies on the experience of operators, which is easy to cause riveting (rivet deformation, workpiece damage) or under riveting (insufficient connection strength) due to parameter deviation. Especially in high-frequency impact riveting, transient pressure fluctuation is difficult to capture, and the process stability is poor.

[0004] 2. Low sensor integration and easy to be disturbed: some improved schemes try to add pressure sensors on the riveting machine, but due to the following problems, it is difficult to be practical: insufficient structural rigidity: the sensor is directly exposed to the riveting impact load, lacks buffer protection, and is easy to cause zero drift, sensitivity decline or even damage due to overload or vibration in long-term use. Poor installation stability: the traditional sensor is fixed by a single nut or buckle, and the spindle vibration in the riveting process is easy to cause sensor deflection or loosening, and the measurement signal is seriously distorted. INVENTION CONTENTS

[0005] In order to overcome at least one of the defects of the prior art described above, the utility model provides a kind of riveting machine pressure sensor equipment and riveting machine. It can solve the problem of inaccurate precision control of riveting machine.

[0006] The technical scheme adopted by the utility model to solve the problem is:

[0007] A kind of riveting machine pressure sensor equipment, comprising: spindle;Shaft sleeve, the shaft sleeve is sleeved on the spindle;First nut, the first nut is threadedly connected with the spindle;Second nut, the second nut is threadedly connected with the spindle;Sensor, the sensor is used to detect riveting machine pressure signal and is converted into electric signal output;Wherein, the shaft sleeve, first nut, sensor and second nut are sequentially sleeved from one end to the other end of the spindle.

[0008] By adopting the above scheme, by integrating the sensor in the spindle force transmission chain, replacing the traditional manual experience parameter adjustment, the riveting force threshold and speed are realized by real-time electric signal closed-loop control;Through the buffer protection of shaft sleeve, reduce the risk of sensor instantaneous overload;The first nut and the second nut can bidirectionally compress the sensor assembly, form rigid fixation, and inhibit the deflection or loosening of the sensor caused by spindle vibration.

[0009] Further, a buffer sleeve is arranged in the shaft sleeve, and the buffer sleeve sequentially comprises a first abutting piece, a buffer piece and a second abutting piece from one end to the other end, the buffer piece is clamped between the first abutting piece and the second abutting piece, and the second abutting piece is assembled at the other end of the buffer sleeve, and the first abutting piece partially penetrates the one end of the buffer sleeve.

[0010] By adopting the above scheme, when instantaneous overload is generated during riveting, the buffer piece can absorb part of impact energy, plays a buffering protection role, reduces the risk of damage of the sensor due to overload, and prolongs the service life of the sensor. The buffer sleeve adopts a split design, can be quickly replaced, and reduces the maintenance cost and downtime of the equipment.

[0011] Further, the sensor is provided with a sensor gasket on the side facing the second nut.

[0012] By adopting the above scheme, high-frequency vibration noise is absorbed by the damping material, the signal signal-to-noise ratio is improved, and the direct compression of the nut pre-tightening force on the sensor is reduced through physical isolation and buffering, so that the deformation or failure of the sensor caused by installation stress is avoided.

[0013] Further, the sensor gasket is provided with a flat position.

[0014] By adopting the above scheme, the circumferential rotation of the sensor gasket is prevented when the main shaft rotates at high speed or is subjected to impact, and the relative position between the sensor and the force chain is ensured to be constant; the flat position structure limits the torsional freedom of the gasket, reduces the fretting wear between the gasket and the sensor under high-frequency vibration, and reduces signal noise.

[0015] Further, the flat position is provided with two or more and is symmetrically distributed.

[0016] By adopting the above scheme, the multiple flat positions form a space constraint, and the risk of any circumferential displacement of the gasket on the main shaft is completely eliminated.

[0017] Further, the sensor gasket is provided with a gasket assembly hole.

[0018] By adopting the above scheme, a rigid connection body is formed, and the risk of relative displacement of the two when the main shaft rotates at high speed or is subjected to impact riveting is completely eliminated.

[0019] Further, the gasket assembly hole is provided with multiple symmetrically distributed holes.

[0020] By adopting the above scheme, the relative rotation or inclination between the gasket and the sensor is eliminated; the nut pre-tightening force is uniformly distributed to the contact surface between the sensor and the gasket through the symmetric hole array, and deformation or cracking caused by single-point stress concentration is avoided.

[0021] Further, the buffer is a spring.

[0022] By adopting the above scheme, the spring absorbs the impact energy of the main shaft through elastic deformation, converts the rigid impact into controllable elastic displacement, and reduces the risk of transient overload of the sensor.

[0023] A riveting machine comprises a frame, a base plate, a driving mechanism and a riveting machine pressure sensor device.

[0024] By adopting the above scheme, the frame serves as a whole support frame, and the base plate serves as a work platform, and the two cooperatively constitute a stable foundation, which can effectively resist the reaction force in the riveting process, reduce equipment vibration and displacement, and improve processing precision.

[0025] Further, the first nut is located on the upper side of the base plate, and the second nut is located on the lower side of the base plate, and the first nut and the second nut are used to fix the main shaft and the base plate.

[0026] By adopting the above scheme, mechanical interlocking is formed by reverse rotation, high-frequency vibration in the riveting process is effectively resisted, additional anti-loosening elements are not needed, riveting precision requirements are met, independent disassembly is allowed, and maintenance time is reduced.

[0027] In summary, the riveting machine pressure sensor device and the riveting machine have the following technical effects:

[0028] 1. The sensor is directly integrated in the main shaft stress chain, real-time monitoring of riveting force and output of an electric signal are realized, closed-loop control of riveting force threshold and speed is realized through a PLC or an industrial computer, manual parameter adjustment errors are avoided, riveting force control precision reaches ±0.5% FS, the risk of over-riveting or under-riveting is significantly reduced, and product qualification rate is improved;

[0029] 2. The first nut and the second nut bidirectionally press the sensor assembly, a mechanical interlocking structure is formed, sensor deflection or loosening caused by main shaft vibration is inhibited, a measurement signal distortion rate is less than or equal to 1%, compared with traditional single-nut fixing, long-term stability is ensured;

[0030] 3. The sensor, the shaft sleeve and the nut are integrally integrated in the main shaft, no additional space is needed, compact riveting machine structures are adapted, equipment volume and weight are reduced, modular design facilitates quick disassembly and maintenance, and sensor replacement time is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a riveting machine three-dimensional structure schematic view of the embodiment of the utility model;

[0032] Figure 2 It is a sensor device three-dimensional structure schematic view of the embodiment of the utility model;

[0033] Figure 3The sensor device without first nut structure schematic view of the embodiment of the utility model;

[0034] Figure 4 The sensor device without sensor structure schematic view of the embodiment of the utility model;

[0035] Figure 5 The main shaft three-dimensional structure schematic view of the embodiment of the utility model;

[0036] Figure 6 The buffer sleeve structure schematic view of the embodiment of the utility model;

[0037] Figure 7 The buffer sleeve internal structure schematic view of the embodiment of the utility model;

[0038] Figure 8 The sensor device cross section structure schematic view of the embodiment of the utility model.

[0039] Among them, the sign meaning is as follows: 1, main shaft;11, annular boss;2, shaft sleeve;21, buffer sleeve;211, first abutment;2111, annular table;212, buffer;213, second abutment;3, first nut;4, second nut;5, sensor;6, sensor gasket;61, flat position;62, gasket assembly hole;7, rack;8, base plate;9, driving mechanism. Specific implementation

[0040] In order to better understand and implement, the following will be combined with the drawings of the utility model, the technical scheme in the embodiment of the utility model is clearly and completely described and discussed, obviously, only a part of the utility model described here, not all examples, based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without doing creative work, belong to the protection scope of the utility model.

[0041] In order to facilitate the understanding of the embodiment of the utility model, the following will be combined with the drawings to explain and describe the specific embodiment as an example, and each embodiment does not constitute the limitation of the embodiment of the utility model.

[0042] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0044] Referring to Figures 1-8 The utility model discloses a riveting machine pressure sensor equipment, include: main shaft 1, axle sleeve 2, first nut 3, second nut 4 and sensor 5, main shaft 1 adopts cylindrical metal axle body, the surface processing has outer thread, and its both ends are used for connecting with the drive mechanism 9 of riveting machine and riveting head respectively. Axle sleeve 2 is set up on main shaft 1, specifically for the one end of main shaft 1 close to drive mechanism 9, and its inner hole diameter is slightly greater than the outer diameter of main shaft 1, allows main shaft 1 to rotate freely or axial movement, optionally, the outer wall of main shaft 1 is equipped with annular boss 11 for cooperating with first nut 3 and limiting, first nut 3 is connected with main shaft 1 by screw thread, second nut 4 is connected with main shaft 1 by screw thread, preferably, first nut 3 and second nut 4 are all hexagon nuts, and the inner thread of nut matches the outer thread of main shaft 1, and sensor 5 selects piezoelectric or strain gauge pressure sensor 5, and the center hole is sleeved on main shaft 1, and the upper and lower end surfaces are directly contacted or indirectly abutted with first nut 3 and second nut 4 respectively, for detecting riveting machine pressure signal and converting into electric signal output, wherein, axle sleeve 2, first nut 3, sensor 5 and second nut 4 are sequentially set from one end of main shaft 1 to the other end, by integrating sensor 5 in main shaft 1 stress transmission chain, replace traditional artificial experience parameter adjustment, realize riveting force threshold value, the closed loop control of speed through real-time electric signal, through the buffer protection of axle sleeve 2, reduce sensor 5 instantaneous overload risk, first nut 3 and second nut 4 can bidirectional pressure sensor 5 assembly, form rigid fixation, inhibit the deflection or slack of sensor 5 caused by main shaft 1 vibration.

[0045] Preferably, in some embodiments, in order to improve the buffering effect, a sensor gasket 6 is arranged at the lower end of the sensor 5 to absorb high-frequency vibration noise through shock-absorbing materials, improve the signal-to-noise ratio, and reduce the direct pressure of the nut preload on the sensor 5 through physical isolation and buffering, thereby avoiding deformation or failure of the sensor 5 due to installation stress. The sensor gasket 6 is a circular metal gasket with a hole in the middle and symmetrically distributed flat positions 61 and gasket assembly holes 62 uniformly distributed on the circumference. Optionally, the flat positions 61 are arranged in two or more symmetrically distributed positions. The sensor gasket 6 prevents circumferential rotation when the main shaft 1 rotates at high speed or is subjected to impact, ensuring the relative position of the sensor 5 and the force chain is constant; the flat position 61 structure limits the gasket's torsional freedom, reducing the micro-motion wear between the gasket and the sensor 5 under high-frequency vibration, and reducing signal noise. Multiple flat positions 61 form a spatial constraint, completely eliminating any risk of circumferential displacement of the gasket on the main shaft 1. The gasket assembly holes 62 are arranged in multiple symmetrically distributed positions to eliminate the relative rotation or inclination between the gasket and the sensor 5; the nut preload is uniformly distributed to the contact surface between the sensor 5 and the gasket through the symmetric hole array, avoiding deformation or cracking caused by single-point stress concentration. In this embodiment 1, the flat positions 61 are arranged in two positions, forming two parallel sections, and the gasket assembly holes 62 are arranged in four positions and uniformly distributed inside the flat positions 61.

[0046] During assembly, the shaft sleeve 2 is inserted into one end of the main shaft 1 until it abuts the end face of the main shaft 1, and then the first nut 3, the sensor 5, and the sensor gasket 6 are installed in sequence, and finally the second nut 4 is screwed in, and the first nut 3 and the second nut 4 are tightened by a special torque wrench, so that the sensor 5 and the sensor gasket 6 are compressed in both directions, forming a rigid fixation.

[0047] Specifically, a split buffer sleeve 21 is embedded in the shaft sleeve 2, and the internal structure includes a first abutting member 211, a buffer member 212, and a second abutting member 213 arranged in sequence from one end to the other end. The first abutting member 211 is a metal cylinder with one end extending out of the buffer sleeve 21, and the first abutting member 211 is provided with an annular table 2111 to prevent it from extending out of the buffer sleeve 21 completely. The buffer member 212 is selected as a spiral spring with both ends respectively clamped into or abutting the first abutting member 211 and the second abutting member 213. The second abutting member 213 is screwed or interference-fitted into the other end of the buffer sleeve 21 to adjust the spring preload. When instantaneous overload occurs during riveting, the buffer member 212 can absorb part of the impact energy, play a buffering protection role, reduce the risk of damage to the sensor 5 due to overload, and prolong the service life of the sensor 5. The buffer sleeve 21 is designed in a split type, which can be quickly replaced, reducing the maintenance cost and downtime of the equipment. When the main shaft 1 is subjected to impact load, the spring is compressed to absorb energy, and the remaining force is transmitted to the sensor 5 after buffering, realizing precise detection of pressure.

[0048] It should be noted that in other embodiments, the buffer 212 is not limited to being a spring that can convert a rigid impact into a controllable elastic displacement to reduce the risk of transient overload of the sensor 5.

[0049] The utility model still relates to a riveting machine, including frame 7, base plate 8, drive mechanism 9 and riveting machine pressure sensor 5 equipment. Frame 7 welding steel structure frame, bottom is equipped with shock absorbing foot pad, base plate 8 horizontal fixation in the middle part of frame 7, center aperture is crossed for main shaft 1, drive mechanism 9 adopts hydraulic cylinder or servo motor, is connected with the upper end of main shaft 1 through shaft coupling, frame 7 as integral support frame, base plate 8 as work platform, both synergistic constitute stable foundation, can effectively resist the counterforce in the riveting process, reduce equipment vibration and displacement, improve processing accuracy.

[0050] Preferably, the first nut 3 is located on the upper side of the base plate 8, the second nut 4 is located on the lower side of the base plate 8, and the first nut 3 and the second nut 4 are used to fix the main shaft 1 and the base plate 8, forming a mechanical interlocking structure by reverse rotation, effectively resisting high-frequency vibration during the riveting process; without additional anti-loose elements, it meets the riveting accuracy requirements; allowing independent disassembly, reducing maintenance time.

[0051] During operation, the workpiece to be riveted is placed below the base plate 8, the rivet head is aligned with the rivet, the drive mechanism 9 pushes the main shaft 1 to press down, and the riveting force is transmitted to the sensor 5 after being buffered by the shaft sleeve 2; the sensor 5 outputs an electrical signal to the PLC, which displays the pressure curve in real time and compares it with the preset threshold; if overpressure is detected, such as exceeding 10% of the set value, the PLC immediately cuts off the hydraulic oil supply or stops the servo motor. Under impact riveting conditions, the signal noise of the sensor 5 is reduced by 82%, with no zero drift. The riveting force fluctuation range and scrap rate are significantly reduced. The replacement time of the sensor 5 is greatly reduced.

[0052] In summary, the riveting machine pressure sensor device and the riveting machine provided by the utility model have the following technical effects:

[0053] 1. The sensor 5 is directly integrated into the force chain of the main shaft 1, which monitors the riveting force in real time and outputs an electrical signal, and through the PLC or industrial computer, the riveting force threshold and speed are closed-loop controlled, avoiding manual parameter adjustment errors, and the riveting force control accuracy is ±0.5% FS, significantly reducing the risk of over-riveting or under-riveting, and improving product qualification rate;

[0054] 2. The first nut 3 and the second nut 4 press the sensor 5 assembly in both directions, forming a mechanical interlocking structure that suppresses the sensor 5 deflection or loosening caused by the vibration of the main shaft 1, and the measurement signal distortion rate is ≤1%, which ensures long-term stability compared to traditional single-nut fixation;

[0055] 3. The sensor 5, the shaft sleeve 2 and the nut are integrated on the main shaft 1, no additional space is needed, the compact riveting machine structure is adapted, the equipment volume and weight are reduced, the modular design is convenient for quick disassembly and maintenance, and the sensor 5 replacement time is greatly reduced.

[0056] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered to be within the protection scope of the utility model.

Claims

1. A riveter pressure sensor apparatus, characterized by, The utility model relates to a riveting machine pressure sensor device, including: A main shaft (1); A shaft sleeve (2) is sleeved on the main shaft (1); A first nut (3) is threadedly connected with the main shaft (1); A second nut (4) is threadedly connected with the main shaft (1); A sensor (5) is used for detecting riveting machine pressure signal and converting into electric signal output; Wherein, the shaft sleeve (2), first nut (3), sensor (5) and second nut (4) are sequentially sleeved from one end to the other end of the main shaft (1).

2. A riveter pressure sensor apparatus according to claim 1, wherein, The shaft sleeve (2) is provided with a buffer sleeve (21), the buffer sleeve (21) sequentially includes a first abutting piece (211), a buffer piece (212) and a second abutting piece (213) from one end to the other end, the buffer piece (212) is clamped between the first abutting piece (211) and the second abutting piece (213), the second abutting piece (213) is assembled at the other end of the buffer sleeve (21), and the first abutting piece (211) partially penetrates one end of the buffer sleeve (21).

3. A riveter pressure sensor apparatus according to claim 1, wherein, The sensor (5) is provided with a sensor gasket (6) on one side of the second nut (4).

4. A riveter pressure sensor apparatus according to claim 3, wherein, The sensor gasket (6) is provided with a flat bit (61).

5. A riveter pressure sensor apparatus according to claim 4, wherein, The flat bit (61) is provided with two or more than two and is symmetrically distributed.

6. A riveter pressure sensor apparatus as defined in claim 4, wherein, The sensor gasket (6) is provided with a gasket assembly hole (62).

7. A riveter pressure sensor apparatus according to claim 6, wherein, The gasket assembly hole (62) is provided with a plurality of and is symmetrically distributed.

8. A riveter pressure sensor apparatus as defined in claim 2, wherein, The buffer piece (212) is a spring.

9. A riveter characterized by comprising: Including frame (7), base plate (8), drive mechanism (9) and the riveting machine pressure sensor device of any one of claims 1-8.

10. A riveter according to claim 9, wherein, The first nut (3) is located on the upside of the base plate (8), the second nut (4) is located on the downside of base plate (8), and the first nut (3) and the second nut (4) are used to fix the main shaft (1) with the base plate (8).

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