WO2022246957A1

WO2022246957A1 - Servo electric cylinder having pneumatic piston

Info

Publication number: WO2022246957A1
Application number: PCT/CN2021/104176
Authority: WO
Inventors: 曾祥迅
Original assignee: 苏州施米特机械有限公司
Priority date: 2021-05-24
Filing date: 2021-07-02
Publication date: 2022-12-01
Also published as: MX2022008458A; CN113134565A

Abstract

A servo electric cylinder having a pneumatic piston, the servo electric cylinder comprising a servo electric motor (1) and a cylinder body (2), wherein the inside of the cylinder body is provided with a ball screw and a main piston rod (3) that is driven by the ball screw to reciprocate; the ball screw is in driving connection with the servo electric motor; the ball screw comprises a screw main body (4) and a screw nut (5); the main piston rod has one end fixed to the screw nut by means of a nut seat (6), the end of the main piston rod close to the nut seat is provided with an avoidance cavity in which the corresponding end of the screw main body is slidably arranged, and the end of the main piston rod away from the nut seat is connected to a rivet rod (7); and the end of the cylinder body away from the servo electric motor is connected to a transition cylinder (8) that is internally provided with a slidably arranged pressing piston rod (9) in which the end of the main piston rod is slidably arranged. The servo electric cylinder has a stable structure, and a riveted part can be completely fixed before riveting, thereby improving the riveting stability and precision.

Description

Servo electric cylinder with pneumatic piston

technical field

The invention relates to the field of automatic machinery, in particular to a servo electric cylinder with a pneumatic piston.

Background technique

Riveting is a very common way of connecting workpieces. There are many aspects of life that require riveting technology. The appearance of riveting machines not only facilitates people to combine products, but also greatly improves the work efficiency of this industry. There are many types of riveting machines on the market, most of which drive the riveting head to reciprocate through hydraulic pressure or air pressure to perform riveting action. During the riveting production of hydraulic or pneumatic riveting machines, the speed and stroke of the output shaft cannot be changed during operation, resulting in reduced production efficiency. , In order to improve riveting efficiency and precision, servo electric cylinders are gradually introduced into the riveting industry, but traditional servo electric cylinders are used as power sources, which lack effective guidance for the long-stroke movement of piercing rivets and lack of compression for parts. Therefore need to propose improvement.

Contents of the invention

The object of the present invention is to provide a servo electric cylinder with a pneumatic piston to overcome the deficiencies in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

The embodiment of the present invention discloses a servo electric cylinder with a pneumatic piston, which includes a servo motor and a cylinder body. A ball screw and a main piston rod driven by the ball screw to reciprocate are arranged inside the cylinder body. The screw drive is connected to the servo motor, the ball screw includes a screw body and a screw nut, one end of the main piston rod is fixed to the screw nut through a nut seat, and one end of the main piston rod is close to the nut seat A relief cavity is processed, and the corresponding end of the screw rod body is slidably arranged in the relief cavity. The end of the main piston rod away from the nut seat is connected with a riveting rod, and the end of the cylinder body away from the servo motor is connected with a transition Cylinder, the transition cylinder is provided with a pressing piston rod that is slidably arranged, and the end of the main piston rod is slidably arranged in the pressing piston rod.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the seal slides between the main piston rod and the cylinder body, between the pressing piston rod and the transition cylinder, and between the main piston rod and the pressing piston rod, so A constant pressure chamber is formed between the main piston rod and the pressing material piston rod.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the outer wall of one end of the transition cylinder close to the cylinder body is connected with a decompression valve with backflow and exhaust function, and the decompression valve is communicated with the constant pressure chamber.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the pressing piston rod is a hollow structure, its side wall is provided with a guide groove, and the main piston rod is provided with a stop pin corresponding to the guide groove.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, an anti-rotation ring is embedded in the inner wall of one end of the transition cylinder close to the cylinder body.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the end of the main piston rod away from the nut seat is connected to a transition seat, and the riveting rod is fixed to the transition seat through a pressing seat.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the transition seat is a stepped shaft structure, including a quick-connect shaft and a connecting shaft, and the end face of the main piston rod is provided with a blind hole for inserting and removing the quick-connect shaft , the side of the main piston rod is processed with a pin hole communicating with the blind hole, and a positioning pin for fixing the quick-connect shaft is arranged in the pin hole.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the side wall of the pressing piston rod is provided with a relief hole coaxial with the pin hole.

Preferably, in the above-mentioned servo electric cylinder with a pneumatic piston, the center of the pressing seat is processed with a stepped through hole, and is connected to the transition seat through a threaded connection.

Compared with the prior art, the present invention has the advantages that: the structure of the servo electric cylinder with pneumatic piston is stable, and a pneumatic pressing piston rod is added to the front end of the private servo electric cylinder. Pre-compression is carried out to reduce the deformation around the riveting, and at the same time form a stable guide pipe to improve the stability and precision of the riveting.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a servo electric cylinder with a pneumatic piston in a specific embodiment of the present invention.

Fig. 2 is a schematic diagram showing the installation of the pressing piston rod in a specific embodiment of the present invention.

Fig. 3 is a schematic diagram of the installation of the gear pin in the specific embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figures 1 to 3, a servo electric cylinder with a pneumatic piston includes a servo motor 1 and a cylinder body 2. A ball screw and a main piston rod driven by the ball screw to reciprocate are arranged inside the cylinder body 2. 3. The ball screw drive is connected to the servo motor 1. The ball screw includes the screw body 4 and the screw nut 5. One end of the main piston rod 3 is fixed to the screw nut 5 through the nut seat 6, and the main piston rod 3 is close to the nut seat. One end of 6 is processed with a relief cavity, and the corresponding end of the screw main body 4 is slidably arranged in the relief cavity. The end of the main piston rod 3 away from the nut seat 6 is connected with a riveting rod 7, and the end of the cylinder body 2 away from the servo motor 1 Connected with a transition cylinder 8, the transition cylinder 8 is provided with a pressing piston rod 9 which is slidably arranged, and the end of the main piston rod 3 is slidably arranged in the pressing piston rod 9.

In this technical solution, the structure and connection structure of the servo motor, cylinder body and ball screw can all adopt the existing technology, so I won’t go into details here one by one. The end of the main piston rod is fixed to the nut seat through threaded connection, the screw nut can drive the main piston rod to move back and forth, and a transition cylinder is added to the front end of the cylinder body, and the transition cylinder is equipped with a sliding pressing piston rod. The end of the main piston rod is slidingly set in the pressing piston rod, and the end of the pressing piston rod is connected to the external rivet mouth, which is convenient for automatic loading of rivets. During the riveting process, the pressing piston rod pre-presses the riveted parts Tight, reduce the deformation around the riveting, and form a stable guide pipe at the same time, improve the stability and precision of riveting.

Further, sealing and sliding between the main piston rod 3 and the cylinder body 2, between the pressing piston rod 9 and the transition cylinder 8, and between the main piston rod 3 and the pressing piston rod 9, the main piston rod 3 and the pressing piston rod A constant pressure chamber 10 is formed between the 9.

In this technical scheme, the gap between the main piston rod and the cylinder body, between the pressing piston rod and the transition cylinder, and between the main piston rod and the pressing piston rod are all sealed by conventional sliding sealing methods, and the gap between the main piston rod and the pressing piston rod A constant pressure chamber is formed between them. During the riveting process, the main piston rod drives the pressing piston rod to move through the pressure of the constant pressure chamber. The constant pressure chamber is equivalent to the existence of a gas spring, which compresses the riveted parts in advance and reduces the deformation around the riveting.

Further, the outer wall of one end of the transition cylinder 8 close to the cylinder body 2 is connected with a decompression valve (not shown) with backflow and exhaust function, and the decompression valve is communicated with the constant pressure chamber.

In this technical solution, the pressure reducing valve is connected to the external compressed air, and is controlled by the control system of the riveting machine together with the servo motor to provide constant pressure for the constant pressure chamber. The constant pressure chamber is equivalent to the existence of a gas spring, and the riveting parts are pressed in advance. , Reduce deformation around riveting.

Further, the pressing piston rod 9 is a hollow structure, and its side wall is provided with a guide groove 91, and the main piston rod 3 is provided with a stop pin 31 corresponding to the guide groove.

In this technical solution, the servo motor drives the main piston rod to move through the ball screw. Due to the existence of the constant pressure chamber, the pressing piston rod slides together. When the pressing piston rod presses the riveted parts with the rivet mouth, the pressing piston rod does not Move again, keep a constant pressure on the riveted parts, a stable pipeline is formed between the rivet mouth and the pressing piston rod, the main piston rod continues to move, the rivet rod pushes the rivet to complete the riveting, the main piston rod starts to reset, when the gear pin touches When guiding the top of the groove, it drives the pressing piston rod to reset. During this process, the precision pressure reducing valve with backflow exhaust function keeps the constant pressure chamber at a constant pressure.

Further, an anti-rotation ring 81 is embedded in an inner wall of the transition cylinder 8 near one end of the cylinder body 2 .

In this technical solution, the inner wall of the anti-rotation ring protrudes from the limit boss, and the side of the main piston rod is processed with a plane corresponding to the limit boss, which prevents the main piston rod from rotating, improves the movement accuracy of the main piston rod, and thus improves the riveting accuracy.

Further, the transition seat 20 is connected to the end of the main piston rod 3 away from the nut seat 6 , and the riveting rod 7 is fixed to the transition seat through the pressing seat 30 .

Further, the transition seat 20 is a stepped shaft structure, including a quick-connect shaft and a connecting shaft. The end face of the main piston rod 3 is provided with a blind hole for inserting and pulling out the quick-connect shaft. The pin hole is provided with a positioning pin for fixing the quick-connect shaft in the pin hole.

Further, a relief hole coaxial with the pin hole is provided on the side wall of the pressing piston rod 9 .

Further, the center of the pressing seat is processed with a stepped through hole, and is connected to the transition seat 20 through threaded connection.

In the above four technical solutions, the rivet rod, the pressing seat and the transition seat can be installed on the front end of the main piston rod as a whole, so as to facilitate the disassembly and assembly of the rivet rod.

To sum up, the servo electric cylinder with pneumatic piston has a stable structure, and a pneumatic pressing piston rod is added to the front end of the private server electric cylinder. During the riveting process, the pressing piston rod pre-presses the riveted parts to reduce the riveting periphery. Deformation, while forming a stable guide pipe, improving the stability and precision of riveting.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The foregoing is only a specific embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims

A servo electric cylinder with a pneumatic piston includes a servo motor and a cylinder body. A ball screw and a main piston rod driven by the ball screw to reciprocate are arranged inside the cylinder body. The ball screw drive is connected to the servo drive. The motor, the ball screw includes a screw body and a screw nut, one end of the main piston rod is fixed to the screw nut through a nut seat, and the end of the main piston rod close to the nut seat is processed with a relief cavity, The corresponding end of the screw main body is slidably arranged in the relief cavity, and it is characterized in that, the end of the main piston rod away from the nut seat is connected with a riveting rod, and the end of the cylinder body away from the servo motor is connected with a transition cylinder, A pressing piston rod is slidably arranged in the transition cylinder, and the end of the main piston rod is slidably arranged in the pressing piston rod.
The servo electric cylinder with pneumatic piston according to claim 1, characterized in that: between the main piston rod and the cylinder body, between the pressing piston rod and the transition cylinder, and between the main piston rod and the pressing piston rod The seal slides, and a constant pressure chamber is formed between the main piston rod and the pressure material piston rod.
The servo electric cylinder with pneumatic piston according to claim 2, characterized in that: the outer wall of one end of the transition cylinder close to the cylinder body is connected with a decompression valve with backflow and exhaust function, and the decompression valve is connected to the constant pressure cavity.
The servo electric cylinder with pneumatic piston according to claim 1, characterized in that: the pressing piston rod is a hollow structure, its side wall is provided with a guide groove, and the main piston rod is provided with a corresponding guide groove. gear pin.
The servo electric cylinder with a pneumatic piston according to claim 1, wherein an anti-rotation ring is embedded in the inner wall of one end of the transition cylinder close to the cylinder body.
The servo electric cylinder with pneumatic piston according to claim 1, characterized in that: the end of the main piston rod away from the nut seat is connected with a transition seat, and the riveting rod is fixed to the transition seat through a pressing seat.
The servo electric cylinder with pneumatic piston according to claim 6, characterized in that: the transition seat is a stepped shaft structure, including a quick-connect shaft and a connecting shaft, and the end surface of the main piston rod is provided with a The blind hole of the shaft, the side of the main piston rod is processed with a pin hole communicating with the blind hole, and a positioning pin for fixing the quick-connect shaft is arranged in the pin hole.
The servo electric cylinder with a pneumatic piston according to claim 7, wherein a relief hole coaxial with the pin hole is provided on the side wall of the pressing piston rod.
The servo electric cylinder with pneumatic piston according to claim 7, characterized in that: the center of the pressing seat is processed with a stepped through hole, and is connected to the transition seat through a threaded connection.