CN-121972893-A - Welding tool and welding method for stainless steel filter plates of vertical filter press

CN121972893ACN 121972893 ACN121972893 ACN 121972893ACN-121972893-A

Abstract

The invention discloses a welding tool and a welding method for a stainless steel filter plate of a vertical filter press, and relates to the technical field of filter press filter plate processing. The fixture comprises a bedplate and a locating frame, wherein the bedplate is consistent with the stainless steel substrate in specification, screw holes matched with the substrate through holes are formed in the bedplate, the substrate can be pressed and fixed through screws, an angular seat with a caulking groove is arranged on the side edge of the angular seat to realize axial locating of a hinge shaft, the locating frame is provided with an annular locating plate matched with a retainer ring, and the retainer ring is inserted into the substrate through holes through pins to complete the pre-locating of the retainer ring. Based on the tooling, the four-person opposed synchronous welding and pre-welding sketch carbon pen smearing to-be-welded area and the screw sectional unloading process of the welding area are adopted. The invention can effectively control welding deformation, solve the defects of the needle eyes of the welding seam and improve the welding precision and the processing efficiency.

Inventors

ZHANG FUYANG
WANG XIANJU
LI RAN
LI MING

Assignees

烟台缘聚装备科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260320

Claims (10)

1. The welding tool for the stainless steel filter plates of the vertical filter press comprises a bedplate (200) and a locating frame (300) and is characterized in that the bedplate (200) is consistent with the stainless steel base plate (101) of the stainless steel filter plate (100) to be welded in specification, a circle of screw holes (201) are formed in the bedplate (200), the arrangement positions of the screw holes (201) are in one-to-one correspondence with the positions of through holes (105) preset on the stainless steel base plate (101) to be welded and the outer side of a stainless steel retainer ring (102), the screw holes (201) are used for allowing fastening screws to pass through the through holes (105) and then are in threaded fit so as to press and fix the stainless steel base plate (101) on the bedplate (200), the distance between adjacent through holes (105) on the stainless steel base plate (101) to be welded is not more than 10cm, and the nominal diameter of the through holes (105) is larger than the nominal diameter of the corresponding screw holes (201) on the bedplate (200); The positioning frame (300) comprises an annular positioning plate (301), a transverse vertical plate (302) and three longitudinal vertical plates (303), wherein the outer outline of the annular positioning plate (301) is matched with the inner outline of the stainless steel retainer ring (102), the stainless steel retainer ring (102) is embedded into the inner side of the stainless steel retainer ring (102) before welding, the stainless steel retainer ring (102) is radially pre-positioned, the relative position precision of the stainless steel retainer ring (102) and the stainless steel substrate (101) is ensured, and after the stainless steel retainer ring (102) and an outer side weld joint of the stainless steel substrate (101) are preliminarily fixed, the positioning frame (300) can be disassembled for welding the inner side weld joint; The transverse vertical plates (302) and the three longitudinal vertical plates (303) are vertically fixedly connected to the upper surface of the annular positioning plate (301), the transverse vertical plates (302) and the longitudinal vertical plates (303) are mutually vertically and fixedly connected in a crossed mode to form a groined-shaped reinforcing frame, two ends of the two longitudinal vertical plates (303) extend outwards, a gap is reserved between the extending sections and the outer wall of the stainless steel retainer ring (102), after the extending sections pass through the stainless steel retainer ring (102), pins (304) are vertically fixedly connected to the lower ends of the extending sections, the outer diameters of the pins (304) are matched with the inner diameters of the through holes (105) and the screw holes (201) at corresponding positions, and the pins (304) can be inserted into the through holes (105) at corresponding positions.
2. The welding fixture for the stainless steel filter plates of the vertical filter press according to claim 1, wherein the bedplate (200) is a carbon steel solid plate, the flatness tolerance of the bedplate (200) is not more than 0.08mm/m, the pin (304) is of a polished rod structure, the length of the pin is matched with the thickness of the stainless steel base plate (101), the outer diameter of the pin is in micro-clearance fit with the through hole (105), or the outer wall of the pin (304) is sleeved with a wear-resistant nylon sleeve, and the wear-resistant nylon sleeve is in micro-clearance fit with the through hole (105).
3. The welding fixture for stainless steel filter plates of vertical filter press according to claim 1, characterized in that the thickness of the annular positioning plate (301) is at least 1/3 of the thickness of the stainless steel retainer ring (102).
4. The welding fixture for the stainless steel filter plates of the vertical filter press according to claim 1, wherein the outer contour of the annular positioning plate (301) is in clearance fit with the inner contour of the stainless steel retainer ring (102), and the fit clearance is 0.05mm-0.15mm.
5. The welding fixture for the stainless steel filter plates of the vertical filter press according to claim 1, wherein the transverse vertical plates (302) are arranged along the central line of the annular locating plate (301) in the length direction, three longitudinal vertical plates (303) are uniformly arranged at intervals along the width direction of the annular locating plate (301), and two hoisting holes (305) are formed in the middle of the transverse vertical plates (302).
6. The welding fixture for the stainless steel filter plates of the vertical filter press according to claim 1, wherein an angular seat (202) is fixedly connected to the side surface of the platen (200) corresponding to the installation position of the hinge shaft (104) of the stainless steel filter plate (100), a semicircular arc caulking groove (203) which is matched with the outline of the hinge shaft (104) is formed in a transverse plate of the angular seat (202), and the depth of the caulking groove (203) is not less than 1/2 of the diameter of the hinge shaft (104) and is used for accommodating and positioning the hinge shaft (104) and limiting the offset of the hinge shaft (104) along the axis direction of the hinge shaft to realize axial positioning.
7. A welding method of a stainless steel filter plate of a vertical filter press, based on the welding fixture of any one of claims 1-6, characterized by comprising the following steps: The method comprises the steps of S1, fixing a substrate, namely, horizontally placing a stainless steel substrate (101) on the upper surface of a bedplate (200), aligning a through hole (105) on the substrate with a screw hole (201) on the bedplate, penetrating the through hole (105) from the upper side of the substrate by adopting fastening screws, screwing the fastening screws into the screw hole (201) of the bedplate, uniformly locking all the fastening screws according to a diagonal sequence, and flatly pressing and fixing the stainless steel substrate (101) on the bedplate (200); S2, pre-positioning the retainer ring, namely placing the stainless steel retainer ring (102) at a preset welding position of the stainless steel substrate (101), after the stainless steel retainer ring is initially calibrated, selecting a spare point position on the bedplate, on which no fastening screw is installed, embedding an annular positioning plate (301) of a positioning frame (300) into the inner side of the stainless steel retainer ring (102), adjusting the position of the positioning frame to enable a pin (304) to be aligned with a through hole (105) at a corresponding position, inserting the pin (304) into the through hole (105), and completing radial pre-positioning of the stainless steel retainer ring (102); S3, pre-welding pretreatment, namely uniformly coating a high-purity sketch carbon pen at an external side to-be-welded internal corner where a stainless steel retainer ring (102) and a stainless steel substrate (101) are connected, wherein the coating thickness is controlled to be 0.05-0.1mm; in the welding process, when a welding gun advances to the vicinity of a certain fastening screw, the fastening screw at the position is removed first, and after the welding gun finishes welding and leaves the corresponding through hole (105) and screw hole (201) areas of the screw, the fastening screw is immediately screwed into the screw hole (201) through the through hole (105) again and locked according to initial torque; s5, dismantling the locating frame, namely after the welding of the outer side weld joint is finished and the welding is cooled to the room temperature, lifting the locating frame (300) upwards to enable the pin (304) to be separated from the through hole (105), dismantling the locating frame (300) and exposing an inner side to-be-welded area of the stainless steel retainer ring (102); S6, welding inner side welding seams, namely repeating the pretreatment operation of the step S3 at the inner side internal corner to be welded where the stainless steel retainer ring (102) and the stainless steel substrate (101) are connected, and completing full welding of the inner side welding seams by adopting welding parameters consistent with the outer side; S7, hinge shaft welding, namely placing the hinge shaft (104) into a caulking groove (203) of the angular base (202) to finish axial positioning, spot welding and fixing the connecting end of the hinge shaft and the stainless steel base plate (101), finishing full welding after checking that the verticality is qualified, and finally welding the pressing nozzle (103) to obtain the finished stainless steel filter plate.
8. The method for welding a stainless steel filter plate of a vertical filter press according to claim 7, wherein in the step S4, the number of fastening screws removed at a time is not more than 2, the torque of screwing back and locking the screws is identical to the initial locking torque, and the deviation is not more than + -5N < m >.
9. The welding method of the stainless steel filter plates of the vertical filter press according to claim 7, wherein in the step S4, four welders adopt welding current of 120-140A, welding speed of 120-150mm/min, interlayer temperature is controlled within 150 ℃, and four welders weld initial positions and welding speeds are synchronous.
10. The welding method of a stainless steel filter plate of a vertical filter press according to claim 7, wherein in the step S3, the adopted high-purity sketching carbon pen is a non-adhesive sulfur-free sketching carbon pen, and the carbon content is more than or equal to 95%.

Description

Welding tool and welding method for stainless steel filter plates of vertical filter press Technical Field The invention relates to the technical field of vertical filter press filter plate processing, in particular to a welding tool and a welding method for a stainless steel filter plate of a vertical filter press, which are suitable for high-precision welding processing of large-size austenitic stainless steel filter plates. Background The vertical filter press is core equipment in the field of solid-liquid separation, and a stainless steel filter plate is a key working part of the vertical filter press. As shown in fig. 1, the stainless steel filter plate 100 to be welded comprises a stainless steel base plate 101 which is rectangular as a whole, an annular stainless steel retainer ring 102 is welded on the surface of the stainless steel base plate 101, the stainless steel retainer ring 102 and the stainless steel base plate 101 are enclosed to form a filter groove for accommodating a honeycomb supporting plate, and two long edges of the stainless steel base plate 101 are also welded with a pressing nozzle 103 and a hinge shaft 104 respectively. In the welding process, the inner and outer internal corners of the joint of the stainless steel retainer ring 102 and the stainless steel substrate 101 are subjected to full welding treatment, the stainless steel filter plate is generally large in specification, the stainless steel substrate 101 and the stainless steel retainer ring 102 are influenced by welding thermal stress in the welding process, and welding deformation such as warping, shrinkage and deflection is extremely easy to occur, so that the flatness and form and position tolerance of the filter plate exceed design requirements, the sealing performance and normal use of the filter plate are further influenced, and the rejection rate of products is greatly improved. In the prior art, the welding tool for the filter plate has the problems of low positioning precision, complex disassembly and assembly operation and insufficient deformation limiting capacity for the retainer ring and the base plate, and cannot meet the high-precision welding requirement of the large-specification stainless steel filter plate. In addition, the internal angle welding of the stainless steel retainer ring and the base plate belongs to fillet welding, the protection difficulty of a molten pool is high, defects such as oxidation inclusion and needle hole air holes are extremely easy to occur, leakage occurs in the use process of the filter plate, the prior art relies on high-purity argon protection and special welding flux, the cost is high, the needle hole problem cannot be thoroughly solved, the prior art mostly adopts single-person sectional welding, the welding heat input is asymmetric, further aggravates deformation, the hinge shaft welding relies on manual support, inclination deviation along the axis of the hinge shaft is easy to occur, the subsequent filter plate and a frame are assembled and blocked, and repeated debugging is needed. In view of the above problems, there is no effective solution at present, and there is a need for a welding tool and a matched welding method that can achieve both deformation control, weld quality and welding efficiency. Disclosure of Invention The invention aims to overcome the defects or one of the defects in the prior art, provides a welding tool for a stainless steel filter plate of a vertical filter press, solves the technical problems of large welding deformation, high defect rate of needle holes of welding seams, low welding efficiency and insufficient positioning accuracy in the prior art, and realizes high-precision, high-efficiency and low-defect rate welding of large-specification stainless steel filter plates. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a welding tool for a stainless steel filter plate of a vertical filter press, which comprises a bedplate and a positioning frame and is characterized in that the bedplate is in accordance with the stainless steel substrate of the stainless steel filter plate to be welded, a circle of screw holes are formed in the bedplate, the arrangement positions of the screw holes are in one-to-one correspondence with the positions of through holes preset in the outer side of a stainless steel retainer ring on the stainless steel substrate to be welded, the screw holes are used for allowing fastening screws to pass through the through holes and then are in threaded fit so as to tightly press and fix the stainless steel substrate on the bedplate, the distance between adjacent through holes on the stainless steel substrate to be welded is not more than 10cm, and the nominal diameter of each through hole is larger than the nominal diameter of a corresponding screw hole on the bedplate; the positioning frame comprises an annular positioning plate, a transverse