Electric cylinder for press-riveting operation

Abstract

The utility model discloses a kind of electric cylinders for press riveting operation, it is through the end face bolt locking cooperation annular positioning step of driving end and pressure sensor, thoroughly eliminate the loosening risk caused by thread gap, ensure that there is no partial swing phenomenon in long-term press riveting operation, significantly improve pressure detection accuracy;Positioning step realizes the automatic radial centering of pressure sensor, after replacement, ram position zero offset, eliminate repeated calibration process, greatly shorten equipment downtime;Backing pad disperses press riveting impact force, effectively protect sensor from damage, prolong its service life;While ram and backing pad split type design, so that ram can be independently and quickly replaced, reduce maintenance cost. Overall structure has high stability and easy maintainability, comprehensively improve press riveting quality and equipment utilization.

Description

Technical Field

[0001] This utility model relates to the field of riveting machine technology, and in particular to an electric cylinder for riveting operations. Background Technology

[0002] The pressure sensor and drive end of the existing riveting cylinder are connected by a threaded rod. The thread clearance is prone to loosening under long-term vibration, causing sensor skew and detection distortion. Replacing the sensor requires repeated calibration of the pressure head position, affecting work efficiency. Although attempts have been made to add anti-loosening structures, the inherent play in the threaded connection cannot completely eliminate the radial runout problem. Especially under high-frequency riveting conditions, loosening will accelerate sensor signal drift. Summary of the Invention

[0003] The main purpose of this invention is to propose an electric cylinder for riveting operations, which aims to completely solve the problem of looseness and wobble between the drive end of the electric cylinder and the pressure sensor, especially the disc-shaped pressure sensor, so as to ensure work efficiency and detection accuracy.

[0004] To achieve the above objectives, this utility model proposes an electric cylinder for riveting operations, comprising an electric cylinder body and a driving end, wherein a disc-shaped pressure sensor is coaxially arranged on the end face of the driving end, and the driving end and the pressure sensor are axially locked together by bolts. Furthermore, the mating surface between the drive end and the pressure sensor is equipped with a positioning step to achieve radial limiting; The pressure sensor has a pad fixed to its bottom, and a pressure head can be detachably installed on the bottom of the pad.

[0005] Preferably, the pressure sensor has a positioning groove on the side near the drive end, and the positioning groove is inserted into the positioning step to achieve radial positioning of the pressure sensor.

[0006] Preferably, the positioning step is circular or polygonal.

[0007] Preferably, the positioning step and the driving end are integrally formed or are detachably connected. When the connection structure is detachable, the positioning step is locked to the drive end by screws or by a snap-fit ​​structure.

[0008] Preferably, there are multiple bolts, which are arranged circumferentially at intervals.

[0009] Preferably, the pad has a locking hole at its center that matches the protrusion at the bottom of the pressure sensor; After the protrusion is inserted into the card hole, the pad and the protrusion are locked together by screws. Furthermore, a ring-shaped space is formed between the top surface of the pad and the bottom surface of the pressure sensor.

[0010] Preferably, the pad is made of elastic alloy steel. Alternatively, it can be made of composite metal sheets, including an impact-resistant base layer and a surface hardening layer. Alternatively, it can be made of precipitation-hardening stainless steel.

[0011] Preferably, the bottom surface of the pad has a circular hole, and the top surface of the pressure head has a circular step that matches the circular hole. When the pad and the pressure head are locked, the circular step is inserted into the circular hole.

[0012] Preferably, the pad and the pressure head are detachably installed using screws; The upper end of the pressure head has multiple through holes spaced circumferentially. The shank of the screw passes through the through holes and is screwed onto the pad to lock the pressure head and the pad. The through holes are elongated or arc-shaped.

[0013] This invention utilizes a ring-shaped positioning step, achieved by locking the drive end and the pressure sensor end face bolts together, to completely eliminate the risk of loosening caused by thread clearance. This ensures no wobble during long-term riveting operations and significantly improves pressure detection accuracy. The positioning step enables automatic radial alignment of the pressure sensor, ensuring zero offset in the pressure head position after replacement, eliminating the need for repeated calibration and greatly reducing equipment downtime. The pad disperses the riveting impact force, effectively protecting the sensor from damage and extending its service life. Furthermore, the separate design of the pressure head and pad allows for independent and quick replacement of the pressure head, reducing maintenance costs. The overall structure combines high stability with ease of maintenance, comprehensively improving riveting quality and equipment utilization. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a partial sectional view of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0016] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0017] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0018] This utility model proposes an electric cylinder for riveting operations.

[0019] In this embodiment of the utility model, such as Figures 1 to 2 As shown, the electric cylinder for riveting includes a cylinder body 1 and a drive end 2. A disc-shaped pressure sensor 3 is coaxially arranged on the end face of the drive end 2. The drive end 2 and the pressure sensor 3 are axially locked together by bolts. Furthermore, the mating surface between the drive end 2 and the pressure sensor 3 is provided with a positioning step 21 to achieve radial limiting; The pressure sensor 3 has a pad 4 fixed at its bottom, and a pressure head 5 can be detachably installed at the bottom of the pad 4.

[0020] Specifically, the pressure sensor 3 has a positioning groove on the side near the drive end 2. The positioning groove is inserted into the positioning step 21 to achieve radial positioning of the pressure sensor 3.

[0021] Specifically, the positioning step is circular or polygonal.

[0022] Specifically, the positioning step 21 and the driving end 2 are either integrally formed or detachably connected. When the connection structure is detachable, the positioning step 21 is locked to the drive end 2 by screws or by a snap-fit ​​structure.

[0023] Specifically, there are multiple bolts, which are arranged in a circumferentially spaced manner.

[0024] Specifically, the center of the pad 4 is provided with a locking hole that matches the protrusion 31 at the bottom of the pressure sensor 3; After the protrusion 31 is inserted into the card hole, the pad 4 and the protrusion 31 are locked by screws. Furthermore, an annular space 100 is formed between the top surface of the pad 4 and the bottom surface of the pressure sensor 3.

[0025] The center of the pad 4 is locked to the protrusion 31. The gap space 100 allows the pad 4 to produce a small amount of elastic deformation during the riveting impact to absorb the instantaneous load, which greatly reduces the impact stress transmitted to the sensor 3. After unloading, the pad 4 automatically resets, which not only protects the precision components of the sensor 3, but also maintains the stability of pressure detection, and extends the overall structural life.

[0026] The protrusion 31 is the sensing column of the pressure sensor.

[0027] Specifically, the pad 4 is made of elastic alloy steel, which generally refers to steel types that obtain elastic deformation capability through heat treatment (such as spring steel and chromium-molybdenum steel) to meet the deformation recovery requirements under repeated impacts. Alternatively, it can be made of composite metal plates, including an impact-resistant base layer and a surface hardening layer, and layered plates made by processes such as explosive welding and hot rolling composite, achieving complementary performance through material combination; Alternatively, it can be made of precipitation-hardening stainless steel. Specifically, it refers to stainless steels such as 17-4PH and 15-5PH that can be strengthened through aging treatment, possessing both rust resistance and high strength.

[0028] Specifically, the bottom surface of the pad 4 is provided with a circular hole 41, and the top surface of the pressure head 5 is provided with a circular step that matches the circular hole 41. When the pad 4 and the pressure head 5 are locked, the circular step is inserted into the circular hole 41.

[0029] Specifically, the pad 4 and the pressure head 5 are detachably installed using screws; The upper end of the pressure head 5 has multiple through holes spaced circumferentially. The shank of the screw passes through the through holes and is screwed onto the pad 4 to lock the pressure head 5 and the pad 4. The through holes are elongated or arc-shaped.

[0030] This invention utilizes a ring-shaped positioning step, achieved by locking the drive end and the pressure sensor end face bolts together, to completely eliminate the risk of loosening caused by thread clearance. This ensures no wobble during long-term riveting operations and significantly improves pressure detection accuracy. The positioning step enables automatic radial alignment of the pressure sensor, ensuring zero offset in the pressure head position after replacement, eliminating the need for repeated calibration and greatly reducing equipment downtime. The pad disperses the riveting impact force, effectively protecting the sensor from damage and extending its service life. Furthermore, the separate design of the pressure head and pad allows for independent and quick replacement of the pressure head, reducing maintenance costs. The overall structure combines high stability with ease of maintenance, comprehensively improving riveting quality and equipment utilization.

[0031] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric cylinder for riveting operations, comprising a cylinder body (1) and a drive end (2), characterized in that: A disc-shaped pressure sensor (3) is coaxially arranged on the end face of the drive end (2), and the drive end (2) and the pressure sensor (3) are axially locked together by bolts. Furthermore, the mating surface between the drive end (2) and the pressure sensor (3) is provided with a positioning step (21) to achieve radial limiting; The pressure sensor (3) has a pad (4) fixed at the bottom, and a pressure head (5) is detachably installed at the bottom of the pad (4).

2. The electric cylinder for riveting operations as described in claim 1, characterized in that: The pressure sensor (3) has a positioning groove on the side near the drive end (2). The positioning groove is inserted into the positioning step (21) to achieve radial positioning of the pressure sensor (3).

3. The electric cylinder for riveting operations as described in claim 1, characterized in that: The positioning step is circular or polygonal.

4. The electric cylinder for riveting as described in claim 1, characterized in that: The positioning step (21) and the driving end (2) are either integrally formed or detachably connected. When the connection structure is detachable, the positioning step (21) is locked to the drive end (2) by screws or by a snap-fit ​​structure.

5. The electric cylinder for riveting as described in claim 1, characterized in that: The number of bolts is multiple, and the multiple bolts are arranged in a circumferentially spaced manner.

6. The electric cylinder for riveting as described in claim 1, characterized in that: The pad (4) has a card hole at its center that matches the protrusion (31) at the bottom of the pressure sensor (3); After the protrusion (31) is inserted into the card hole, the pad (4) and the protrusion (31) are locked by screws; Furthermore, an annular space (100) is formed between the top surface of the pad (4) and the bottom surface of the pressure sensor (3).

7. The electric cylinder for riveting as described in claim 1, characterized in that: The pad (4) is made of elastic alloy steel. Alternatively, it can be made of composite metal sheets, including an impact-resistant base layer and a surface hardening layer. Alternatively, it can be made of precipitation-hardening stainless steel.

8. The electric cylinder for riveting as described in claim 1, characterized in that: The bottom surface of the pad (4) is provided with a circular hole (41), and the top surface of the pressure head (5) is provided with a circular step that matches the circular hole (41). When the pad (4) and the pressure head (5) are locked, the circular step is inserted into the circular hole (41).

9. The electric cylinder for riveting as described in claim 1, characterized in that: The pad (4) and the pressure head (5) are detachably installed by screws; The upper end of the pressure head (5) has multiple through holes spaced circumferentially. The shank of the screw passes through the through holes and is screwed onto the pad (4) to lock the pressure head (5) and the pad (4). The through holes are elongated or arc-shaped.

Images