CN214375985U

CN214375985U - PLC control system

Info

Publication number: CN214375985U
Application number: CN202023049805.5U
Authority: CN
Inventors: 董文宁; 刘少辉
Original assignee: Ruixintai Intelligent Technology Kunshan Co ltd
Current assignee: Ruixintai Intelligent Technology Kunshan Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-10-08
Anticipated expiration: 2030-12-17

Abstract

The application discloses PLC control system, it includes: PLC controller, man-machine operation interface, welding power supply, feeding mechanism and welding robot, the PLC controller is connected with the communication of man-machine operation interface, the PLC controller is connected with the welding power supply communication, the PLC controller is connected with the feeding mechanism communication, the PLC controller is connected with the welding robot communication, the break-make of PLC controller control welding power supply, the motion of PLC controller control feeding mechanism, the welding of PLC controller control welding robot. According to the method, a PLC control structure is adopted, coordination control is carried out on a robot, a surfacing welding power supply, a feeding mechanism and the like in a network port communication mode, a man-machine operation interface touch screen is adopted for operation, and quick programming of workpieces, modification of process parameters and quick setting and production of equipment are achieved.

Description

PLC control system

Technical Field

The application relates to the field of automation equipment, in particular to a PLC control system.

Background

The quality reliability of the hydraulic valve group of the hydraulic system becomes a key factor for the stable operation of the hydraulic system. Under the working condition of alternating movement of a hydraulic medium, the hydraulic valve core needs high-reliability sealing requirements. In the process of machining the valve core, a layer of copper alloy needs to be overlaid on a sealing notch in the middle of the valve core, and the requirement of sealing technical indexes is met through pressure testing after precision turning and grinding. The case is different according to the operating mode condition, and the product variety is many, and diameter, length, both ends size, middle notch size are all inequality, and in the build-up welding process, the case build-up welding needs to ensure the parameter control of bottoming filling capping continuous process and the management and control of actions such as welder, pay-off moreover. Such system commissioning requires that production process sizing and parameter tuning be as fast and operational as possible. Robotic automated welding has been used to achieve batch processing. However, the surfacing equipment for the workpieces requires a programming control structure mode to meet the requirements of rapidness and convenience.

The robot is used as a control to realize programmed welding. The method adopts a robot control system as a control core and carries out programming operation through a robot teaching box. The programming language and the programming mode have high requirements on the professional expertise of personnel. The parameters are programmed by adopting a teaching mode, and the programming language is basically English display, so that certain requirements are required for the cultural degree of operators, the rapid post-shift of the existing personnel in a factory is not facilitated, and the adjustment of the personnel structure in the factory is influenced. Parameter programming and modification are complex. The robot control system manages and controls welding power supply parameters, rotating structure parameters, gun cleaning and wire cutting actions and automatic feeding and discharging actions in a network port communication protocol mode, and the parameters of multiple layers, multiple channels and multiple intervals in the process need to be strictly carried out according to the programming time sequence requirements of the robot. And the robot related body axis and the external related axis parameters are compiled item by item according to a specified time sequence. The programming, modification and adjustment of process parameters for each type of workpiece are very complicated, and the rapid trial welding, shaping and production of the workpiece are not facilitated. The system maintainability is poor. As the robot control mode is adopted, the software of the control mode is not opened, and once the system fails, the system needs to help the original factory to assist, so that the system is influenced to be quickly repaired and put into production.

Disclosure of Invention

The application provides a PLC control system, it includes: PLC controller, man-machine operation interface, welding power supply, feeding mechanism and welding robot, the PLC controller is connected with the communication of man-machine operation interface, the PLC controller is connected with the welding power supply communication, the PLC controller is connected with the feeding mechanism communication, the PLC controller is connected with the welding robot communication, the break-make of PLC controller control welding power supply, the motion of PLC controller control feeding mechanism, the welding of PLC controller control welding robot.

Compared with the prior art, the PLC control structure is adopted in the device, the robot, the surfacing welding power supply, the feeding mechanism and the like are coordinately controlled in a network port communication mode, and a human-computer operation interface touch screen is adopted for operation, so that rapid programming of workpieces, modification of process parameters and rapid shaping and production of equipment are realized.

Furthermore, the PLC control system further comprises a gun cleaning and wire cutting mechanism, the PLC is in communication connection with the gun cleaning and wire cutting mechanism, and the PLC controls the gun cleaning and wire cutting mechanism to execute corresponding operations.

Further, the PLC control system comprises a rack, a support, a welding robot, a first fixing mechanism and a second fixing mechanism, wherein the rack comprises a lower rack, an upper rack and a platform connected between the upper rack and the lower rack, and the support, the welding robot, the first fixing mechanism and the second fixing mechanism are arranged on the upper surface of the platform;

the PLC controller sets up in the lower frame, the frame is located in the human-computer operation interface dew, PLC control system is including setting up in the push mechanism of support, the PLC controller is connected with push mechanism, first driving piece, second driving piece, welding robot communication, the motion of PLC controller control push mechanism, first driving piece, second driving piece, welding robot, the human-computer operation interface is used for the corresponding instruction of PLC controller input.

The PLC control system further comprises a bottom plate, a first side plate, a second side plate and a material blocking baffle, wherein the bottom plate is fixed on the support, the first side plate and the second side plate are respectively arranged on two opposite sides of the bottom plate in the width direction, and the first side plate, the second side plate and the bottom plate define a moving space for movement of the valve core;

the base plate is obliquely arranged relative to the ground plane by taking the ground plane as a reference, the first side plate and the second side plate are arranged in parallel, the first side plate is obliquely arranged relative to the ground plane, the second side plate is obliquely arranged relative to the ground plane, the first side plate is perpendicular to the base plate, and the second side plate is perpendicular to the base plate;

the bottom plate is provided with a top part and a bottom part, the top part is far away from the ground level relative to the bottom part, the material blocking baffle is arranged at the bottom part of the bottom plate, and the material blocking baffle is used for limiting the valve core to move to the corresponding carrying platform;

the bottom plate is provided with a flat plate part facing the activity space and a guide strip protruding from the flat plate part, the length direction of the guide strip is overlapped with the length direction of the bottom plate, and the guide strip is used for being matched with the guide groove of the valve core to guide the movement of the valve core.

Further, PLC control system includes plummer and gasket, the plummer is used for receiving the case through keeping off the material baffle restriction motion, the plummer is connected with push mechanism, the plummer sets up in the below that keeps off the material baffle, the plummer can keep away from or be close to and keep off the material baffle motion under push mechanism's drive, gasket detachably sets up on the plummer for adapt to not unidimensional case.

The PLC control system further comprises an adjusting mechanism, the adjusting mechanism is used for adjusting the distance between a first side plate and a second side plate, the first side plate is fixedly connected to the bottom plate, the adjusting mechanism is arranged near the second side plate, and the second side plate can move close to or far away from the first side plate through adjustment of the adjusting mechanism;

the first fixing mechanism is provided with a first driving piece and a first axial fixing mechanism, the second fixing mechanism is provided with a second driving piece and a second axial fixing mechanism, the valve core is provided with a shaft hole which penetrates through the valve core along the axial direction of the valve core, the first axial fixing mechanism can extend into a first end of the shaft hole under the driving of the first driving piece, the second axial fixing mechanism can extend into a second end of the shaft hole under the driving of the second driving piece, and the first end and the second end are positioned on different sides of the axial direction of the valve core;

the PLC controller sets up PLC control system still includes receiving agencies, receiving agencies is located between first fixed establishment and the second fixed establishment, receiving agencies is located the place ahead of support, receiving agencies is used for collecting the case that the build-up welding was accomplished.

Drawings

Fig. 1 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 2 is an enlarged view of a portion indicated by a circle a.

Fig. 3 is a perspective view of another view of a PLC control system according to an embodiment of the present application.

Fig. 4 is a perspective view of another view of a PLC control system according to an embodiment of the present application.

Fig. 5 is a perspective view of another view of a PLC control system according to an embodiment of the present application.

Fig. 6 is a schematic front view of a PLC control system according to an embodiment of the present application.

Fig. 7 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 8 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 9 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 10 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 11 is a schematic perspective view of a PLC control system according to an embodiment of the present application.

Fig. 12 is a perspective view of another view of a PLC control system according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Similarly, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one; "plurality" means two or more than two. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items.

The piping connection assembly according to the exemplary embodiment of the present application will be described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments can be supplemented or combined with each other without conflict.

As shown in fig. 1, a PLC control system includes: PLC controller 29, man-machine operation interface 31, welding power supply 51, feeding mechanism 52 and welding robot 26, PLC controller 29 is connected with man-machine operation interface 31 communication, PLC controller 29 is connected with welding power supply 51 communication, PLC controller 29 is connected with feeding mechanism 52 communication, PLC controller 29 is connected with welding robot 26 communication, PLC controller 29 controls the break-make of welding power supply 51, PLC controller 29 controls the motion of feeding mechanism 52, PLC controller 29 controls the welding of control welding robot 26.

The PLC performs digital communication with a matched robot control system, a power supply communication interface, a servo motor driver and a touch screen by adopting a network cable port through communication protocol modes such as Profinet, Divecnet, Earth and the like, and performs communication control on external gun cleaning, wire cutting, automatic feeding and discharging through I/O analog quantity. The PLC adopts a ladder diagram to program according to the requirements of the welding process, and the programmable parameters are displayed on the touch screen interface of the man-machine operation interface 31. The touch screen operation display carries out interface design according to humanized operation habits and requirements. The programming parameters include: the model of the workpiece, the surfacing current, the surfacing voltage, the rotating speed, the interval angle, the interval number, the gun cleaning frequency and the like, and the programmed numerical values and units correspond to each other according to the international standard. Clicking the parameters needing to be programmed on the touch screen interface, and writing corresponding digital confirmation. For people who know the operation related to welding, the method can be operated intuitively and simply. A series of processes such as quick programming, parameter adjustment optimization, parameter shaping and production are realized.

As shown in fig. 2 and 3, a PLC control system may guide the movement of the valve element 14 having the guide groove 141 at the middle portion thereof. The valve core 14 is a hydraulic valve core, has a cylindrical structure, and can be made of stainless steel. The guide groove 141 is a groove and is used for surfacing welding copper material solder, after surfacing welding is completed, materials are removed from the inner cylinder wall and the outer cylinder wall of the valve element 14 through a cutter until the inner side and the outer side are smooth and the copper material is exposed, so that the guide groove (groove) of the valve element 14 is a copper material cylinder, the two sides are stainless steel cylinders, and the structure that the copper material is arranged in the middle of the valve element and smooth transition is achieved.

As shown in fig. 1 to 6, the PLC control system includes: the support 15, bottom plate 16, first curb plate 17, second curb plate 18 and striker plate 19.

The bottom plate 16 is fixed to the bracket 15, the first side plate 17 and the second side plate 18 are respectively disposed on two opposite sides of the bottom plate 16 in the width direction, and the first side plate 17, the second side plate 18 and the bottom plate 16 define an activity space 21 for the movement of the valve element 14.

As shown in fig. 7, the bottom plate 16 is disposed obliquely with respect to the ground plane G, and the first side plate 17 and the second side plate 18 are disposed in parallel with each other. The first side plate 17 is obliquely arranged relative to the ground plane G, the second side plate 18 is obliquely arranged relative to the ground plane G, the first side plate 17 is perpendicular to the bottom plate 16, and the second side plate 18 is perpendicular to the bottom plate 16.

The bottom plate 16 has a top portion 161 and a bottom portion 162, the top portion 161 is far away from the ground plane G relative to the bottom portion 162, and the material stop plate 19 is disposed at the bottom portion 162 of the bottom plate 16, and the material stop plate 19 is used for limiting the valve core 14 to move to the corresponding bearing platform 23.

As shown in fig. 3, the bottom plate 16 has a flat plate portion 163 facing the movable space and a guide strip 164 protruding from the flat plate portion 163, a length direction of the guide strip 164 coincides with a length direction of the bottom plate 16, and the guide strip 164 is used to guide the movement of the valve element 14 in cooperation with the guide groove 141 of the valve element 14. The slope groove-shaped slide way is a mechanism for realizing sequential placement, guiding and automatic sliding down of the valve cores 14. The valve core 14 can automatically slide down under the condition of gradient by means of the self weight, and the action of external driving force is omitted. According to the structural style of the valve core 14, the length, the diameter, the groove guide and other characteristics of the valve core 14 are designed, and the gradient of the valve core can be adjusted through a mechanical angle adjusting mechanism arranged on the back and is matched with the material receiving position of the pushing mechanism after blanking. The groove-shaped slide way is provided with a guide rail (a guide strip 164) in the middle, and is suitable for the gliding of a workpiece with a groove in the middle of the valve core 14 or unequal diameters at two ends, so that the axial deviation can not be caused, the workpiece can be clamped at two sides of the groove plate, and the blanking is influenced.

The PLC control system further comprises an adjusting mechanism 22, and the adjusting mechanism 22 is used for adjusting the distance between the first side plate 17 and the second side plate 18, so that the valve core 14 with different lengths, sizes and specifications can be adapted, and the valve cores 14 with different models can be switched more easily. The distance between the first side plate 17 and the second side plate 18 is not suitable to be too large relative to the length difference of the valve core 14, if the difference is too large, the valve core 14 cannot be limited, and if the difference is too small, the first side plate 17 and the second side plate 18 are in contact with the valve core 14, and the valve core 14 cannot move. The end mechanical adjusting mechanism 22 is used for ensuring that different valve cores 14 with different diameters are fed onto the pushing mechanism at the position, the diameter is consistent with the diameter fed to the center of the processing equipment by the pushing mechanism, and the single valve cores 14 are kept to be sequentially fed. The adjusting mechanism 22 is adjusted in height and front-back direction, and is provided with a material blocking baffle 19 of a subsequent valve core 14, so that the condition that the valve cores 14 are stacked and fall over a slide way under the action of weight is prevented.

The first side plate 17 is fixedly connected to the bottom plate 16, the adjusting mechanism 22 is disposed near the second side plate 18, and the second side plate 18 can move close to or away from the first side plate 17 through adjustment of the adjusting mechanism 22. The adjusting mechanism 22 can be manually adjusted, so that the structure is simple, and the adjustment can be automatically performed through a cylinder and a servo motor, so that the automation degree is higher, and the labor cost is saved.

The bracket 15 includes a lower plate 151, an upper plate 152, and an intermediate plate 153 connected between the lower plate 151 and the upper plate 152, as shown in fig. 7, the lower plate 151 is disposed parallel to the ground plane G, the intermediate plate 153 is disposed perpendicular to the ground plane G, the upper side surface of the upper plate 152 is supported on the lower side surface of the bottom plate 16, the upper plate 151 is disposed inclined with respect to the ground plane G, and the upper plate 151 is disposed parallel to the bottom plate 16.

The PLC control system further comprises a bearing platform 23, a pushing mechanism 30 and a gasket 41, the bearing platform 23 is used for receiving the valve core 14 which moves in a limited mode through the material blocking baffle 19, the bearing platform 23 is connected with the pushing mechanism 30, the bearing platform 23 is arranged below the material blocking baffle 19, and the bearing platform 23 can be far away from or close to the material blocking baffle 19 to move under the driving of the pushing mechanism 30. The gasket 41 is detachably disposed on the carrier 23 to accommodate different sizes of valve cartridges 14. In the illustrated embodiment, the spacer 41 has an L-shape, and includes a horizontal support portion 411 and a vertical support portion 412, wherein the horizontal support portion 411 is attached to the upper surface of the bottom plate 16, the vertical support portion 412 is perpendicular to the horizontal support portion 411, and the horizontal support portion 411 is parallel to the bottom plate 16. In an alternative embodiment, the spacer 41 may have a V-shape, an irregular shape, etc., as long as it can adjust the height of the pad to the left or right and cooperate with the valve core 14. The pushing mechanism 30 is a motion executing mechanism which can automatically and quickly feed the material to the processing equipment after the material is dropped to the front end of the mechanism, and quickly retreat to the initial position. According to the characteristic points of the workpiece, a pushing power source adopts a cylinder pushing mode, and the action and the time sequence of a cylinder are cooperated with the control time sequence of the processing equipment, so that the workpiece rapidly moves forwards and backwards under the condition of meeting the effective and safe clamping state of the workpiece. The feeding angle and position of the pushing mechanism 30 are matched with the central position of the processing equipment and the position of the clamped workpiece in a relevant manner.

In the illustrated embodiment, the pushing mechanism 30 is an air cylinder, which has lower cost and relatively stable pushing performance, and in an alternative embodiment, the pushing mechanism 30 may also be a servo motor, so that the control precision is more accurate. The PLC control system comprises a positioning mechanism 32 for installing and positioning the pushing mechanism 30, and the pushing mechanism 32 penetrates through the positioning mechanism 32 and can move relative to the positioning mechanism 32.

As shown in fig. 8, the PLC control system further includes a first fixing mechanism 24 and a second fixing mechanism 25, the first fixing mechanism 23 having a first driving member 241 and a first axial fixing mechanism 242, and the second fixing mechanism 25 having a second driving member 251 and a second axial fixing mechanism 252. The valve core 14 has a shaft hole 142 passing through along the axial direction thereof, the first axial fixing mechanism 242 is driven by the first driving member 241 to extend into a first end of the shaft hole 142, the second axial fixing mechanism 252 is driven by the second driving member 251 to extend into a second end of the shaft hole 142, and the first end and the second end are located on different sides of the axial direction of the valve core 14.

The first axial fixing mechanism 242 and the second axial fixing mechanism 252 have their axes coincident with each other, and the first axial fixing mechanism 24 and the second axial fixing mechanism 25 are located in front of the bracket 15.

The PLC control system 11 further includes a welding robot 26, the welding robot 26 being located in lateral proximity to the first side plate 17 or the second side plate 18, the welding robot 26 being used to weld the guide groove 141 of the valve element 14.

As shown in fig. 8 to 10, the PLC control system further includes a frame 27, the frame 27 includes a lower frame 271, an upper frame 272, and a platform 273 connected between the upper frame 272 and the lower frame 271, and the support frame 15, the welding robot 26, the first fixing mechanism 24, and the second fixing mechanism 25 are mounted on an upper surface of the platform 273. The PLC control system 11 further comprises a material receiving mechanism 28, the material receiving mechanism 28 is located between the first fixing mechanism 24 and the second fixing mechanism 25, the material receiving mechanism 28 is located in front of the support 15, and the material receiving mechanism 28 is used for collecting the valve core 14 which is subjected to surfacing welding.

The welding robot 26 includes a machine table 261, a mechanical arm 262 and a welding head 263, wherein the machine table 261 is fixedly connected to the platform 273, the mechanical arm 262 is connected between the machine table 273 and the welding head 263, the mechanical arm 262 can rotate around the machine table 273 in multiple axes, and the welding head 263 ejects the brazing filler metal to weld the guide groove 141 of the valve element 14.

The PLC control system further comprises a PLC controller 29 and a man-machine operation interface 31, the PLC controller 29 is arranged in the lower rack 271, and the man-machine operation interface 31 is exposed on the upper rack 272. The human-machine interface 31 is in communication connection with the control structure 31, the PLC controller 31 is in communication connection with the pushing mechanism 30, the first driving member 241, the second driving member 251 and the welding robot 26, the PLC controller 31 controls the pushing mechanism 30, the first driving member 241, the second driving member 251 and the welding robot 26 to move, and the human-machine interface 31 is used for inputting corresponding instructions to the PLC controller 31.

The lower frame 271 has a first storage chamber 33 and a second storage chamber 34 with two openings, the PLC control system includes a work cassette 35 stored in the first storage chamber 33, and the PLC controller 29 is located in the second storage chamber 34. The workpiece box 35 and the PLC 29 are exposed outside, so that the corresponding equipment can be conveniently taken out to perform corresponding operation on the corresponding equipment.

The outer wall of the rear side wall of the upper rack 272 is provided with the servo motor 36 and the electronic component 37, and the servo motor 36 and the electronic component are arranged outside the upper rack 272, so that the installation space is saved, and the miniaturization of equipment is facilitated.

As shown in fig. 11 and 12, the PLC control system further includes a box body 38 and a fitting body 39, the box body 38 is disposed below the first fixing mechanism 24 and the second fixing mechanism 25, and the fitting body 39 and the welding robot 26 are located on opposite sides of the first side plate 17 and the second side plate 18.

The feeding process comprises the steps that firstly, according to the structural characteristics of the valve core 14, the angle and the position of the groove plate slide way are adjusted, manual or automatic rotating disks place the valve cores 14 on the groove type slide way according to a certain direction and quantity, under the action of gravity, the first valve core 14 is firstly blanked to the front end of pushing, after a starting signal of the processing equipment is started, the pushing mechanism 30 quickly sends the first valve core 14 to a processing position for clamping, the pushing mechanism 30 quickly returns to the initial position, and when the position is returned, under the action of gravity, the second valve core 14 falls on the pushing mechanism 30 to be fed. After the machining process is finished, the control system sends a signal to the air cylinder of the pushing mechanism 30 to feed the second valve core 14, and the second valve core 14 is circularly operated.

The bottom plate 16 of this application has the plane part 163 that is located towards the activity space and the protruding guide strip 164 that stretches from plane part 163, the length direction of guide strip 164 and the length direction coincidence of bottom plate 16, guide strip 164 is used for the motion with the guide slot 141 cooperation guide case 14 of case 14, thereby the automatic feeding of case 14 has been realized, realize the quick material loading requirement of case 14, greatly shorten the time of case 14 material loading, the production beat is with efficient, and it is little to possess the installation space, the wide advantage of application operating mode scope.

The gasket 41 of the present application is detachably disposed on the bearing table 23, so that the valve element 14 of different sizes can be quickly adapted, and the production efficiency is high.

The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception and within the scope of the present invention.

Claims

1. A PLC control system, comprising: PLC controller, man-machine operation interface, welding power supply, feeding mechanism and welding robot, the PLC controller is connected with the communication of man-machine operation interface, the PLC controller is connected with the welding power supply communication, the PLC controller is connected with the feeding mechanism communication, the PLC controller is connected with the welding robot communication, the break-make of PLC controller control welding power supply, the motion of PLC controller control feeding mechanism, the welding of PLC controller control welding robot.

2. The PLC control system according to claim 1, wherein: the PLC control system further comprises a gun cleaning and wire cutting mechanism, the PLC is in communication connection with the gun cleaning and wire cutting mechanism, and the PLC controls the gun cleaning and wire cutting mechanism to execute corresponding operations.

3. The PLC control system according to claim 1, wherein: the PLC control system also comprises a bottom plate, a first side plate, a second side plate and a material blocking baffle, wherein the bottom plate is fixed on the bracket, the first side plate and the second side plate are respectively arranged on two opposite sides of the width direction of the bottom plate, and the first side plate, the second side plate and the bottom plate define a movable space for movement of the valve core;

4. The PLC control system according to claim 3, wherein: the PLC control system comprises a bearing table and a gasket, the bearing table is used for receiving the valve cores which are limited to move through the material blocking baffle, the bearing table is connected with the pushing mechanism, the bearing table is arranged below the material blocking baffle, the bearing table can be far away from or close to the material blocking baffle to move under the driving of the pushing mechanism, and the gasket is detachably arranged on the bearing table and used for adapting to the valve cores of different sizes.

5. The PLC control system according to claim 4, wherein:

the PLC control system comprises a rack, a support, a welding robot, a first fixing mechanism and a second fixing mechanism, wherein the rack comprises a lower rack, an upper rack and a platform connected between the upper rack and the lower rack;

the PLC controller is arranged in the lower rack, and the man-machine operation interface is exposed on the upper rack;

the first fixing mechanism is provided with a first driving part and a first axial fixing mechanism, the second fixing mechanism is provided with a second driving part and a second axial fixing mechanism, the valve core is provided with a shaft hole which penetrates through the valve core along the axial direction of the valve core, the first axial fixing mechanism can extend into a first end of the shaft hole under the driving of the first driving part, the second axial fixing mechanism can extend into a second end of the shaft hole under the driving of the second driving part, the first end and the second end are positioned on different sides of the axial direction of the valve core, the PLC control system comprises a pushing mechanism arranged on a support, and the PLC controller is in communication connection with the pushing mechanism, the first driving part, the second driving part and the welding robot;