Plate end face seam welding device for plate heat exchanger

Abstract

The utility model relates to a plate end face seam welding device for a plate heat exchanger, and belongs to the technical field of plate heat exchanger manufacturing. According to the technical scheme, a first seam welding wheel of a first seam welding head (201) and a second seam welding wheel of a second seam welding head (202) are both obliquely arranged, and a plate heat exchanger plate end face A is horizontally placed between the first seam welding wheel and the second seam welding wheel; the first seam welding head and the second seam welding head are installed at the front end of the movable electrode arm (103) and the front end of the fixed electrode arm respectively. The pressurizing cylinder is hinged with the lower end of the movable electrode arm; the second seam welding wheel of the second seam welding head and the first seam welding wheel of the first seam welding head are driven to rotate through the transmission mechanism (5), and welding of the plate end face A of the plate heat exchanger is completed under the action of pressure and current. According to the utility model, lap welding seams formed on the plate end faces of the plate heat exchanger are welded by seam welding, so that good compression and electric conduction can be realized under the condition that the vertical distance between the plate end faces of the plate heat exchanger is small, automatic welding of the plate end faces is realized, the production efficiency is high, and the welding quality is stable.

Description

Technical Field

[0001] The utility model relates to a plate end face seam welding device for a plate heat exchanger, belonging to the technical field of plate heat exchanger preparation. Background Art

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of a series of stacked, corrugated metal sheets. Thin rectangular channels are formed between the plates, through which heat is exchanged. Plate heat exchangers are ideal for liquid-liquid and liquid-gas heat exchange, offering high heat transfer efficiency, minimal heat loss, a compact and lightweight structure, a small footprint, and a long service life. They are widely used in industries such as metallurgy, mining, chemicals, power generation, and shipbuilding.

[0003] The production process of plate heat exchanger mainly includes single piece stamping, two pieces are joined into pairs, and multiple pairs are welded to form Figure 1 The structure shown. Among them, when multiple pairs of plates are welded, the edges around the two plates need to be welded together to obtain good airtightness. The plate end face A of the plate heat exchanger in the figure is the plate end face formed by welding two plates, but the vertical distance between the plate end face A of the plate heat exchanger and the upper plate end face B is at least 18 mm, and the welding position space is narrow. The existing technology mainly adopts TIG and other arc welding methods to weld the end faces to form end joints, but in actual production, the gaps between the two plates are often of different sizes, and the misalignment size is difficult to guarantee, which easily leads to defects such as burn-through and incomplete welding; at the same time, the welding efficiency is low and cannot meet the requirements of automated production; in addition, the weld position needs to be tracked in real time during the automatic welding process, which places high requirements on the equipment.

[0004] Seam welding is a resistance welding method in which the welded parts are assembled into overlapping joints and placed between two roller electrodes. The rollers pressurize the workpieces while rotating, applying power continuously or intermittently to form a continuous weld seam. Widely used for its high efficiency, high quality, and ease of operation, it can offset the shortcomings of arc welding. However, to achieve excellent welding results, seam welding imposes strict requirements on pressure, electrical conductivity, and water cooling. Existing seam welding machines typically use two symmetrical, vertically pressed rollers on the workpiece surface to ensure electrical conductivity and stable pressure. However, this structure clearly cannot meet the welding requirements of plate heat exchanger end faces, where welding space is limited. Utility Model Content

[0005] The purpose of the utility model is to provide a plate end face seam welding device for a plate heat exchanger, which adopts seam welding to weld the plate end face A of the plate heat exchanger. The equipment is simple to operate and has low requirements on the processing accuracy of the plate heat exchanger plates. When the vertical distance between the plate end faces of the plate heat exchanger is small, good compression and conductivity can be achieved, and automatic welding of the plate end faces can be realized. The production efficiency is high, the welding quality is stable, the production cost is low, the skill requirements of the operator are reduced, and the problems existing in the background technology are solved.

[0006] The technical solution of the utility model is:

[0007] A plate end face seam welding device for a plate heat exchanger comprises a frame, a seam welding head, a conductive plate, a cooling system and a transmission mechanism. Two seam welding heads are arranged at the front end of the frame, namely seam welding head 1 and seam welding head 2. Seam welding head 1 and seam welding head 2 have the same structure and are arranged symmetrically. Seam welding wheel 1 of seam welding head 1 and seam welding wheel 2 of seam welding head 2 are both arranged obliquely, and the plate end face A of the plate heat exchanger is placed horizontally between seam welding wheel 1 and seam welding wheel 2. A conductive plate is provided inside the frame, and current is transmitted through the conductive plate. The frame comprises a frame shell, a fixed electrode arm is installed at the front end of the frame shell, a movable electrode arm is installed at the lower end of the fixed electrode arm, and seam welding head 1 and seam welding head 2 are respectively installed at the front ends of the movable electrode arm and the fixed electrode arm ; A pressurized cylinder is installed at the lower end of the frame shell, and the pressurized cylinder is hinged to the lower end of the movable electrode arm. By controlling the movement and pressure of the pressurized cylinder, the movement and pressure adjustment of the movable electrode arm are realized, so that the seam welding wheel 2 of the seam welding head 2 and the seam welding wheel 1 of the seam welding head 1 are respectively pressed against the upper surface and lower surface of the plate end face A of the plate heat exchanger to be welded; a cooling system is installed on the frame, and the cooling system is connected to an external cooling water tank, and is cooled by the cooling system; a transmission mechanism is installed on the fixed electrode arm, and the transmission mechanism is connected to the seam welding head 2. The seam welding wheel 2 of the seam welding head 2 and the seam welding wheel 1 of the seam welding head 1 are driven to rotate by the transmission mechanism, and the welding of the plate end face A of the plate heat exchanger is completed under the action of pressure and current.

[0008] The seam welding head includes an electrode seat, an electrode shaft is installed inside the electrode seat; a pressure cap is installed at one end of the electrode shaft, and a seam welding wheel is installed at the other end, and the seam welding wheel is parallel to the electrode seat; mounting holes are respectively provided on both sides of the electrode seat, and a pressure cap, a spring and a conductive column are installed in each mounting hole from the outside to the inside in sequence, the conductive column is tightly attached to the electrode seat, and the end of the conductive column close to the electrode shaft is an arc surface, which matches the electrode shaft, and the spring is compressed by rotating the pressure cap to make the conductive column contact with the electrode shaft. When the conductive column is worn, the gap between the conductive column and the electrode shaft can be automatically compensated to ensure good conductivity.

[0009] The conductive column is made of chromium-zirconium-copper.

[0010] The electrode holder (1) defines a stepped hole, within which the electrode shaft (1) is disposed. A cavity is formed between the electrode shaft (1) and the electrode holder (1), within which insulating sleeves (1) and (2) are mounted at either end of the electrode shaft (1), respectively. A bearing (1) is mounted between the insulating sleeve (2) and the electrode holder (1). During operation, the electrode shaft (1) and the electrode holder (1) are insulated, and current is transmitted through the electrode holder (1) via the conductive column to the electrode shaft (1), and ultimately to the seam welding wheel (1).

[0011] A first positioning block is installed below the front end surface of the movable electrode arm, and a first positioning groove is provided on the front end surface of the movable electrode arm; a second positioning block is installed on the front end surface of the fixed electrode arm, and a second positioning groove is provided on the upper end of the front end surface of the fixed electrode arm.

[0012] A positioning key is installed on the upper end of the electrode holder of the seam welding head one, and the positioning key is installed in the positioning groove of the movable electrode arm. The electrode holder one is installed on the movable electrode arm through the positioning key and the positioning block; a positioning key is installed on the upper end of the electrode holder of the seam welding head two, and the positioning key is installed in the positioning groove of the fixed electrode arm. The electrode holder two is installed on the fixed electrode arm through the positioning key and the positioning block, thereby realizing the positioning and installation of the seam welding head one and the movable electrode arm, and the seam welding head two and the fixed electrode arm.

[0013] Oil inlet holes are respectively provided on both sides below the electrode holder one, and lubricating oil enters the cavity between the electrode holder one and the electrode shaft one through the oil inlet holes to lubricate the electrode shaft one and reduce transmission wear; water holes five are respectively provided on both sides of the electrode holder one above the pressure cover two, and a seam welding head water channel is arranged in the electrode holder one, and the seam welding head water channel includes a water inlet pipe, an annular water channel and a water outlet pipe. The water inlet pipe and the water outlet pipe are respectively arranged on both sides of the electrode shaft one, and the annular water channel is arranged below the electrode shaft one. Both ends of the annular water channel are respectively connected to the water holes five on both sides through the water inlet pipe and the water outlet pipe. The seam welding head water channel starts from the water hole five on one side, passes through the water inlet pipe to one end of the annular water channel below, is divided into two branches, and then converges at the other end of the annular water channel and extends to the water hole five on the other side through the water outlet pipe.

[0014] There are four conductive plates, namely conductive plate 1, conductive plate 2, conductive plate 3 and conductive plate 4. One ends of conductive plate 1 and conductive plate 2 are both installed on conductive plate 3, conductive plate 3 is installed on fixed plate 1, and the other ends of conductive plate 1 and conductive plate 2 are respectively connected to the movable electrode arm and the water-cooling cable; one end of conductive plate 4 is installed on the rear end of the fixed electrode arm, and the other end is connected to the water-cooling cable; the rear end of the fixed electrode arm is installed on fixed plate 2, and fixed plate 2 and fixed plate 1 are both installed in the frame shell.

[0015] The water-cooling cable is connected to an external power supply.

[0016] The conductive plate 1 is an elastic conductive plate, two pairs of opposite water holes 3 and 4 are provided on the conductive plate 3, two opposite water holes 2 are provided at the rear end of the fixed electrode arm, and two opposite water holes 1 are provided on the movable electrode arm; one of the two opposite water holes is an inlet, and the other is an outlet.

[0017] The transmission mechanism includes a motor, a reducer and a chassis. The motor and the reducer are connected, the reducer is installed on the chassis, and the chassis is installed on the fixed electrode arm; a transmission shaft is also installed on the chassis, and the transmission shaft is connected to the output shaft of the reducer through a synchronous belt; the transmission shaft and the electrode shaft are connected through a coupling, and the rotation of the seam welding wheel is realized through the transmission mechanism.

[0018] A solenoid valve is installed on the frame shell, and the solenoid valve is connected to an external electrical proportional valve and a pressurized cylinder respectively. By controlling the movement and pressure of the pressurized cylinder, the movement and pressure of the movable electrode arm are adjusted, thereby realizing the tightening and loosening of the seam welding wheel.

[0019] A limiting screw is installed on the movable electrode arm, and the limiting screw is opposite to a limiting block installed on the frame shell. The movable electrode arm is limited by the limiting screw and the limiting block.

[0020] The second and first seam welding wheels are placed on the upper and lower surfaces of the plate end faces A of the plate heat exchanger, respectively, at the locations to be welded. The angle between the first and second seam welding wheels is 120-130 degrees. Each wheel has a diameter of 120-125 mm and a thickness of 6-8 mm. Both wheels have arc surfaces with a radius of 3-4 mm. Both wheels are made of chromium-zirconium copper. This arrangement ensures good contact between the two wheels and the plate end faces, ensuring tight contact and good electrical conductivity, even when the vertical distance between the heat exchanger plate ends is small. Furthermore, wear on the wheels is easily repairable.

[0021] The cooling system includes a water block and an external water block, which are both arranged on the frame shell; the water block is provided with water inlet 1, water inlet 2, water inlet 3, water inlet 4, water inlet 5, water inlet 6, water outlet 1, water outlet 2, water outlet 3, water outlet 4, water outlet 5 and water outlet 6; water inlet 1, water inlet 2, water outlet 1 and water outlet 2 are respectively connected to the external cooling water tank, water inlet 3 and water inlet 5 are respectively communicated with water inlet 1, water inlet 4 and water inlet 6 are respectively communicated with water inlet 2, water outlet 3 and water outlet 5 are respectively communicated with water outlet 1, and water outlet 4 and water outlet 6 are respectively communicated with water outlet 2; two external water outlets are provided on the external water block.

[0022] A straight water channel 1 is provided between the two water holes 3 on the conductive plate 3, and a straight water channel 2 is provided between the two water holes 4 on the conductive plate 3. A straight water channel 3 is provided between the two water holes 1 on the movable electrode arm, and a straight water channel 4 is provided between the two water holes 2 on the fixed electrode arm.

[0023] The fixed electrode arm and the movable electrode arm are both made of brass, and the conductive plate is made of copper.

[0024] The pressurizing force of the pressurizing cylinder is 3000-4000N.

[0025] The plate end surface A of the plate heat exchanger is the plate end surface formed when two plates are welded together. The upper surface and lower surface of the plate end surface A of the plate heat exchanger are the upper surface of the upper plate and the lower surface of the lower plate in the plate heat exchanger plate end surface A respectively.

[0026] The pressurized cylinder, external electrical proportional valve, motor and reducer are all well-known and commonly used equipment in the art.

[0027] During use, the plate end face A of the plate heat exchanger to be welded is placed under the seam welding wheel 2, and the external electrical proportional valve and solenoid valve are adjusted to control the action and pressure of the pressurized cylinder to realize the action and pressure adjustment of the movable electrode arm, so that the seam welding wheel 1 contacts the position to be welded on the lower surface of the plate end face A of the plate heat exchanger, and the seam welding wheel 2 and the seam welding wheel 1 are respectively pressed against the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded; the current is transmitted in sequence to the conductive plate 4, the fixed electrode arm, the electrode holder 2 of the seam welding head 2, the conductive column of the seam welding head 2, the electrode shaft 2 of the seam welding head 2, the seam welding wheel 2, the plate heat exchanger plate The end face A, seam welding wheel 1, electrode shaft 1, conductive column of seam welding head 1, electrode holder 1, movable electrode arm, conductive plate 1, conductive plate 3 and conductive plate 2 are then connected to the welding power supply through a water-cooling cable; cooling water enters the cooling system from the external cooling water tank to cool the fixed electrode arm, conductive plate 4, movable electrode arm, conductive plate 1, conductive plate 2, conductive plate 3, seam welding head 1, seam welding head 2, seam welding wheel 1 and seam welding wheel 2; during welding, the seam welding wheel 1 is driven to rotate by the transmission mechanism and electrode shaft 1, and under the action of friction, the seam welding wheel 2 also rotates at the same time, completing the welding of the end face A of the plate heat exchanger under the action of pressure and current.

[0028] The beneficial effects of the utility model are as follows: seam welding is used to weld the lap welds formed on the end faces of the plate heat exchanger plates. The equipment is simple to operate and has low requirements on the processing accuracy of the plate heat exchanger plates. When the vertical distance between the end faces of the plate heat exchanger plates is small, good compression and conductivity can be achieved, and automatic welding of the plate end faces can be realized. The production efficiency is high, the welding quality is stable, the production cost is low, and the skill requirements of the operator are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the workpiece to be welded on the end face of the plate heat exchanger;

[0030] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0031] Figure 3 This is the main view of the utility model;

[0032] Figure 4 This is a schematic diagram of the internal structure of the rack shell of the utility model;

[0033] Figure 5 This is the rear view of the utility model;

[0034] Figure 6 This is an axial view of the utility model;

[0035] Figure 7 This is a schematic diagram of the structure of the seam welding head of the utility model;

[0036] Figure 8 This is the front view of the seam welding head of the utility model;

[0037] Figure 9 This is an internal cross-sectional view of the utility model;

[0038] Figure 10 for Figure 8 DD direction schematic diagram;

[0039] Figure 11 for Figure 8 CC direction schematic diagram;

[0040] Figure 12 This is a schematic diagram of the annular waterway structure of the utility model;

[0041] Figure 13 This is a schematic diagram of the structure of the seam welding wheel of the utility model;

[0042] Figure 14 This is a schematic diagram of the transmission mechanism structure of the utility model;

[0043] Figure 15 This is a schematic diagram of the water block structure of the utility model;

[0044] In the figure: frame 1, frame shell 101, pressurized cylinder 102, movable electrode arm 103, fixed electrode arm 104, limit block 105, limit screw 106, positioning block 2 107, positioning block 1 108, water hole 1 109, water hole 2 110, water block 111, water inlet 1 11101, water inlet 3 11102, water inlet 2 11103, water inlet 4 1110 4. Water outlet three 11105, water outlet one 11106, water outlet four 11107, water outlet two 11108, water outlet six 11109, water outlet five 11110, water inlet six 11111, water inlet five 11112, external watering block 112, external watering port 113, seam welding head 2, seam welding head one 201, seam welding wheel one 20101, electrode holder one 20102, Electrode shaft 1 20103, bearing 1 20104, insulating sleeve 2 20105, insulating sleeve 1 20106, gland 1 20107, gland 2 20108, spring 20109, conductive column 20110, oil inlet hole 20111, positioning key 1 20112, water hole 5 20113, annular water channel 20114, water inlet pipe 20115, water outlet pipe 20116, seam welding head 202, seam welding wheel 2 20201, conductive plate 3, conductive plate 1 301, conductive plate 2 302, conductive plate 3 303, conductive plate 4 304, water hole 3 305, water hole 4 306, fixed plate 2 307, fixed plate 1 308, solenoid valve 4, transmission mechanism 5, motor 501, reducer 502, chassis 503, synchronous belt 504, transmission shaft 505. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0046] A plate end face seam welding device for a plate heat exchanger comprises a frame 1, a seam welding head 2, a conductive plate 3, a cooling system and a transmission mechanism 5. Two seam welding heads 2 are arranged at the front end of the frame 1, namely seam welding head 1 201 and seam welding head 2 202. The seam welding head 1 201 and the seam welding head 2 202 have the same structure and are symmetrically arranged. The seam welding wheel 1 20101 of the seam welding head 1 201 and the seam welding wheel 2 20201 of the seam welding head 2 202 are both arranged obliquely, and the plate end face A of the plate heat exchanger is placed horizontally between the seam welding wheel 1 20101 and the seam welding wheel 2 20201. A conductive plate 3 is provided inside the frame 1, and current is transmitted through the conductive plate 3. The frame 1 comprises a frame shell 101, a fixed electrode arm 104 is installed at the front end of the frame shell 101, a movable electrode arm 103 is installed at the lower end of the fixed electrode arm 104, and the seam welding head 1 201 and the seam welding head 2 202 are respectively installed at the movable electrode arm 103 and the fixed electrode arm 104. The front end of the electrode arm 104; a pressurized cylinder 102 is installed at the lower end of the frame shell 101, and the pressurized cylinder 102 is hinged to the lower end of the movable electrode arm 103. By controlling the movement and pressure of the pressurized cylinder 102, the movement and pressure adjustment of the movable electrode arm 103 are realized, so that the seam welding wheel 2 20201 of the seam welding head 202 and the seam welding wheel 1 20101 of the seam welding head 1 201 are respectively pressed against the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded; a cooling system is installed on the frame 1, and the cooling system is connected to the external cooling water tank and is cooled by the cooling system; a transmission mechanism 5 is installed on the fixed electrode arm 104, and the transmission mechanism 5 is connected to the seam welding head 202. The seam welding wheel 2 20201 of the seam welding head 202 and the seam welding wheel 1 20101 of the seam welding head 1 201 are driven to rotate by the transmission mechanism 5, and the welding of the plate end face A of the plate heat exchanger is completed under the action of pressure and current.

[0047] The seam welding head 201 comprises an electrode holder 20102, an electrode shaft 20103 is installed inside the electrode holder 20102; a pressure cap 20107 is installed at one end of the electrode shaft 20103, and a seam welding wheel 20101 is installed at the other end, and the seam welding wheel 20101 and the electrode holder 20102 are parallel to each other; mounting holes are respectively provided on both sides of the electrode holder 20102, and a pressure cap 20108, a spring 20109 and a conductive column 20108 are installed in each mounting hole from the outside to the inside. 110, the conductive column 20110 is tightly attached to the electrode seat 1 20102, and the end of the conductive column 20110 close to the electrode shaft 1 20103 is an arc surface, which matches the electrode shaft 1 20103. By rotating the pressure cover 20108 to compress the spring 20109, the conductive column 20110 is brought into contact with the electrode shaft 1 20103. When the conductive column 20110 is worn, the gap between the conductive column 20110 and the electrode shaft 1 20103 can be automatically compensated to ensure good conductivity.

[0048] The conductive column 20110 is made of chromium-zirconium-copper.

[0049] The electrode holder 1 20102 defines a stepped hole, within which the electrode shaft 1 20103 is disposed. A cavity is formed between the electrode shaft 1 20103 and the electrode holder 1 20102. Within the cavity, insulating sleeves 1 20106 and 20105 are mounted at either end of the electrode shaft 1 20103, respectively. Bearing 1 20104 is mounted between insulating sleeve 20105 and the electrode holder 1 20102. During operation, the electrode shaft 1 20103 is insulated from the electrode holder 1 20102. Current is transmitted through the electrode holder 1 20102, via the conductive column 20110, to the electrode shaft 1 20103, and ultimately to the seam welding wheel 1 20101.

[0050] A positioning block 108 is installed below the front end surface of the movable electrode arm 103, and a positioning groove 1 is provided on the front end surface of the movable electrode arm 103; a positioning block 107 is installed on the front end surface of the fixed electrode arm 104, and a positioning groove 2 is provided on the upper end of the front end surface of the fixed electrode arm 104.

[0051] A positioning key 20112 is installed on the upper end of the electrode holder 20102 of the seam welding head 201, and the positioning key 20112 is installed in the positioning groove 1 of the movable electrode arm 103. The electrode holder 20102 is installed on the movable electrode arm 103 through the positioning key 20112 and the positioning block 108; a positioning key 2 is installed on the upper end of the electrode holder 2 of the seam welding head 202, and the positioning key 2 is installed in the positioning groove 2 of the fixed electrode arm 104. The electrode holder 2 is installed on the fixed electrode arm 104 through the positioning key 2 and the positioning block 2 107, thereby realizing the positioning and installation of the seam welding head 201 and the movable electrode arm 103, as well as the seam welding head 202 and the fixed electrode arm 104.

[0052] Oil inlet holes 20111 are respectively provided on both sides below the electrode holder 1 20102, and lubricating oil enters the cavity between the electrode holder 1 20102 and the electrode shaft 1 20103 through the oil inlet holes 20111 to lubricate the electrode shaft 1 20103 and reduce transmission wear; water holes 5 20113 are respectively provided on both sides of the electrode holder 1 20102 above the pressure cover 2 20108, and a seam welding head water path is provided in the electrode holder 1, and the seam welding head water path includes a water inlet pipe 20115 and a ring water path 2011 4 and the water outlet pipe 20116, the water inlet pipe 20115 and the water outlet pipe 20116 are respectively arranged on both sides of the electrode axis 20103, the annular water channel 20114 is arranged below the electrode axis 20103, and the two ends of the annular water channel are respectively connected to the water holes 5 20113 on both sides through the water inlet pipe and the water outlet pipe. The seam welding head water channel starts from the water hole five on one side through the water inlet pipe to one end of the annular water channel below, is divided into two branches, and then merges at the other end of the annular water channel and extends to the water hole five on the other side through the water outlet pipe.

[0053] There are four conductive plates 3, namely conductive plate 1 301, conductive plate 2 302, conductive plate 3 303 and conductive plate 4 304. One end of conductive plate 1 301 and conductive plate 2 302 are both mounted on conductive plate 3 303, and conductive plate 3 303 is mounted on fixed plate 1 308. The other ends of conductive plate 1 301 and conductive plate 2 302 are respectively connected to the movable electrode arm 103 and the water-cooling cable; one end of conductive plate 4 304 is mounted on the rear end of the fixed electrode arm 104, and the other end is connected to the water-cooling cable; the rear end of the fixed electrode arm 104 is mounted on fixed plate 2 307, and fixed plate 2 307 and fixed plate 1 308 are both mounted in the rack housing 101.

[0054] The water-cooling cable is connected to an external power supply.

[0055] The conductive plate 1 301 is an elastic conductive plate, and two pairs of opposite water holes 3 305 and water holes 4 306 are provided on the conductive plate 303. Two opposite water holes 2 110 are provided at the rear end of the fixed electrode arm 104, and two opposite water holes 1 109 are provided on the movable electrode arm 103. One of the two opposite water holes is an inlet, and the other is an outlet.

[0056] The transmission mechanism 5 includes a motor 501, a reducer 502 and a chassis 503. The motor 501 and the reducer 502 are connected, the reducer 502 is installed on the chassis 503, and the chassis 503 is installed on the fixed electrode arm 104; a transmission shaft 505 is also installed on the chassis 503, and the transmission shaft 505 is connected to the output shaft of the reducer 502 through a synchronous belt 504; the transmission shaft 505 is connected to the electrode shaft 20103 through a coupling, and the rotation of the seam welding wheel is realized through the transmission mechanism.

[0057] The solenoid valve 4 is installed on the frame shell 101, and the solenoid valve 4 is connected to the external electrical proportional valve and the pressurizing cylinder 102 respectively. By controlling the movement and pressure of the pressurizing cylinder 102, the movement and pressure of the movable electrode arm 103 are adjusted, thereby realizing the tightening and loosening of the seam welding wheel 20101.

[0058] A limiting screw 106 is installed on the movable electrode arm 103 . The limiting screw 106 is opposite to a limiting block 105 installed on the frame housing 101 . The movable electrode arm 103 is limited by the limiting screw 106 and the limiting block 105 .

[0059] The second and first seam welding wheels 20201 and 20101 are placed on the upper and lower surfaces of the plate end face A of the plate heat exchanger, respectively, at the locations to be welded. The angle between the first and second seam welding wheels 20101 and 20201 is 120-130 degrees. The diameter D1 of each seam welding wheel 20101 and 20201 is 120-125 mm, and the thickness t is 6-8 mm. Both seam welding wheels 20101 and 20201 have arc surfaces with a radius R1 of 3-4 mm. Both seam welding wheels 20101 and 20201 are made of chromium-zirconium copper. This arrangement ensures good contact between the two seam welding wheels and the end faces of the plates to be welded, ensuring tight contact and good electrical conductivity, even when the vertical distance between the heat exchanger plate ends is small. Furthermore, wear of the seam welding wheels is easily repairable.

[0060] The cooling system comprises a water block 111 and an external water block 112, both of which are arranged on the frame housing 101; the water block 111 is provided with a water inlet 11101, a water inlet 2 11103, a water inlet 3 11102, a water inlet 4 11104, a water inlet 5 11112, a water inlet 6 11111, a water outlet 1 11106, a water outlet 2 11108, a water outlet 3 11105, a water outlet 4 11107, a water outlet 5 11110 and a water outlet 6 11109; 1103, water outlet one 11106 and water outlet two 11108 are respectively connected to the external cooling water tank, water inlet three 11102 and water inlet five 11112 are respectively communicated with water inlet one 11101, water inlet four 11104 and water inlet six 11111 are respectively communicated with water inlet two 11103, water outlet three 11105 and water outlet five 11110 are respectively communicated with water outlet one 11106, water outlet four 11107 and water outlet six 11109 are respectively communicated with water outlet two 11108; two external watering ports 113 are arranged on the external watering block 112.

[0061] A direct water channel 1 is defined between the two third water holes 305 on the conductive plate 303, and a direct water channel 2 is defined between the two fourth water holes 306 on the conductive plate 303. A direct water channel 3 is defined between the two first water holes 109 on the movable electrode arm 103, and a direct water channel 4 is defined between the two second water holes 110 on the fixed electrode arm 104.

[0062] The fixed electrode arm 104 and the movable electrode arm 103 are both made of brass, and the conductive plate 3 is made of copper.

[0063] The pressurizing force of the pressurizing cylinder 102 is 3000-4000N.

[0064] The plate end surface A of the plate heat exchanger is the plate end surface formed when two plates are welded together. The upper surface and lower surface of the plate end surface A of the plate heat exchanger are the upper surface of the upper plate and the lower surface of the lower plate in the plate heat exchanger plate end surface A respectively.

[0065] The pressurizing cylinder 102 , the external electric proportional valve, the motor 501 and the reducer 502 are all well-known and commonly used devices in the art.

[0066] During use, the position to be welded of the plate end face A of the plate heat exchanger is placed under the seam welding wheel 2 20201, and the external electrical proportional valve and the solenoid valve 4 are adjusted to control the action and pressure of the pressurized cylinder 102, so as to realize the action and pressure adjustment of the movable electrode arm 103, so that the seam welding wheel 1 20101 contacts the position to be welded of the plate end face A of the plate heat exchanger, and the seam welding wheel 2 20201 and the seam welding wheel 1 20101 are respectively pressed against the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded; the current is transmitted in sequence to the conductive plate 4 304, the fixed electrode arm 104, the electrode holder 2 of the seam welding head 2, the conductive column of the seam welding head 2, the electrode shaft 2 of the seam welding head 2, the seam welding wheel 2 20201, the plate end face A of the plate heat exchanger, the seam welding wheel 1 20101, and the electrode shaft 1 201 through the water-cooling cable of the external power supply. 03. The conductive column, electrode holder 1 20102, movable electrode arm 103, conductive plate 1 301, conductive plate 3 303 and conductive plate 2 302 of the seam welding head 1 are connected to the welding power supply through a water-cooling cable; cooling water enters the cooling system from the external cooling water tank to cool the fixed electrode arm 104, conductive plate 4 304, movable electrode arm 103, conductive plate 1 301, conductive plate 2 302, conductive plate 3 303, seam welding head 1 201, seam welding head 2 202, seam welding wheel 1 20101 and seam welding wheel 2 20201; during welding, the seam welding wheel 1 20101 is driven to rotate by the transmission mechanism 5 and the electrode shaft 1 20103, and under the action of friction, the seam welding wheel 2 20201 also rotates at the same time, and the welding of the plate end face A of the plate heat exchanger is completed under the action of pressure and current.

[0067] The specific cooling steps are as follows:

[0068] For cooling the fixed electrode arm 104 and the conductive plate 4 304: one of the water holes 2 110 is connected to the water inlet 3 11102 via a water distributor and a water pipe, and the other water hole 2 110 is connected to the water outlet 3 11105 via a water pipe. The specific cooling method is as follows: cooling water from the external cooling water tank enters the water inlet 3 11102 from the water inlet 1 11101, flows through the water pipe into one of the water holes 2 110, the water channel 4 and the other water hole 2 110, and then flows through the water pipe into the water outlet 3 11105 and the water outlet 1 11106 in sequence, and then returns to the external cooling water tank.

[0069] For the cooling of the movable electrode arm 103, the conductive plate 1 301, the conductive plate 2 302 and the conductive plate 3 303: one of the water holes 109 is connected to the water inlet 4 11104 with a water pipe, another water hole 109 is connected to a water hole 3 305 with a water pipe, another water hole 305 is connected to one of the water holes 4 306 through a water pipe, and another water hole 4 306 is connected to the water outlet 4 11107 with a water pipe; the specific cooling method is: external The cooling water from the cooling water tank enters the water inlet 4 11104 from the water inlet 2 11103, flows through the water pipe into one of the water holes 1 109, water channel 3 and another water hole 1 109, then flows through one of the water holes 3 305, water channel 1, another water hole 3 305, one of the water holes 4 306, water channel 2 and another water hole 4 306, and finally flows through the water pipe into the water outlet 4 11107 and the water outlet 2 11108 before flowing out to the external cooling water tank;

[0070] Cooling method of two seam welding heads: one of the water holes 5 20113 on the seam welding head 1 201 is connected to the water inlet 6 11111 with a water pipe, and the other water hole 5 20113 is connected to the water outlet 6 11109 with a water pipe; the specific cooling method is: cooling water from the external cooling water tank enters the water inlet 6 11111 from the water inlet 2 11103, flows into one of the water holes 5 20113, the water inlet pipe 20115, the annular water channel 20114, the water outlet pipe 20116 and the other water hole 5 20113, and passes through the water outlet 6 11109 and the water outlet 2 11108 Flows out to the external cooling water tank; one of the water holes six on the seam welding head two 202 is connected to the water inlet five 11112 with a water pipe, and the other water hole six is ​​connected to the water outlet five 11110 with a water pipe; the specific cooling method is: the cooling water of the external cooling water tank enters the water inlet five 11112 from the water inlet one 11101, flows into one of the water holes six of the seam welding head two 202, and circulates in the same way as the seam welding head one 201, and then flows out from the other water hole six, and then flows out to the external cooling water tank through the water outlet five 11110 and the water outlet one 11106.

[0071] Cooling of the two seam welding wheels: The two external watering ports 113 are connected to the water inlet three 11102 through a water distributor and a water pipe. During welding, the cooling water from the external cooling water tank enters the water inlet three 11102 from the water inlet one 11101, enters the two external watering ports 113 through the water distributor and the water pipe, and then flows directly to the two seam welding wheels to cool them.

Claims

1. A plate end face seam welding device for a plate heat exchanger, characterized in that: The invention comprises a frame (1), a seam welding head (2), a conductive plate (3), a cooling system and a transmission mechanism (5); two seam welding heads (2) are arranged at the front end of the frame (1), namely seam welding head 1 (201) and seam welding head 2 (202); seam welding head 1 (201) and seam welding head 2 (202) have the same structure and are symmetrically arranged; seam welding wheel 1 (20101) of seam welding head 1 (201) and seam welding wheel 2 (202) of seam welding head 2 (202) are both arranged tilted; a plate end face A of a plate heat exchanger is horizontally placed between seam welding wheel 1 (20101) and seam welding wheel 2 (20201); a conductive plate (3) is arranged inside the frame (1), and current is transmitted through the conductive plate (3); the frame (1) comprises a frame shell (101), a fixed electrode arm (104) is installed at the front end of the frame shell (101), a movable electrode arm (103) is installed at the lower end of the fixed electrode arm (104), and a seam welding head 1 (201) and a seam welding head 2 (202) are respectively installed at the front ends of the movable electrode arm (103) and the fixed electrode arm (104); a pressurizing cylinder (102) is installed at the lower end of the frame shell (101), and the pressurizing cylinder (102) is hinged to the lower end of the movable electrode arm (103); a cooling system is installed on the frame (1), and the cooling system is connected to an external cooling water tank; a transmission mechanism (5) is installed on the fixed electrode arm (104), and the transmission mechanism (5) is connected to the seam welding head 2 (202).

2. The plate end face seam welding device for a plate heat exchanger according to claim 1, characterized in that: The seam welding head (201) comprises an electrode holder (20102), an electrode shaft (20103) is installed inside the electrode holder (20102); a pressure cap (20107) is installed at one end of the electrode shaft (20103), and a seam welding wheel (20101) is installed at the other end, and the seam welding wheel (20101) and the electrode holder (20102) are parallel to each other; mounting holes are respectively provided on both sides of the electrode holder (20102), and each mounting hole is sequentially installed from the outside to the inside. The second pressure cover (20108), the spring (20109) and the conductive column (20110) are installed. The conductive column (20110) is tightly attached to the electrode seat (20102). The end of the conductive column (20110) close to the electrode shaft (20103) is an arc surface, which matches the electrode shaft (20103). The spring (20109) is compressed by rotating the second pressure cover (20108) to make the conductive column (20110) contact the electrode shaft (20103).

3. The plate end face seam welding device for a plate heat exchanger according to claim 2, characterized in that: A stepped hole is provided in the electrode seat 1 (20102), and the electrode shaft 1 (20103) is arranged in the stepped hole; a cavity is formed between the electrode shaft 1 (20103) and the electrode seat 1 (20102), and an insulating sleeve 1 (20106) and an insulating sleeve 2 (20105) are respectively installed at both ends of the electrode shaft 1 (20103) in the cavity, and a bearing 1 (20104) is installed between the insulating sleeve 2 (20105) and the electrode seat 1 (20102).

4. The plate end face seam welding device for a plate heat exchanger according to claim 3, characterized in that: Oil inlet holes (20111) are respectively provided on both sides below the electrode holder 1 (20102), and lubricating oil enters the cavity between the electrode holder 1 (20102) and the electrode shaft 1 (20103) through the oil inlet holes (20111) to lubricate the electrode shaft 1 (20103); water holes 5 (20113) are respectively provided on both sides of the electrode holder 1 (20102) above the pressure cap 2 (20108), and a seam welding head water path is provided in the electrode holder 1, and the seam welding head water path includes a water inlet pipe (20115), an annular water path (2011 4) and the water outlet pipe (20116), the water inlet pipe (20115) and the water outlet pipe (20116) are respectively arranged on both sides of the electrode axis one (20103), the annular water channel (20114) is arranged below the electrode axis one (20103), and the two ends of the annular water channel are respectively connected to the water holes five (20113) on both sides through the water inlet pipe and the water outlet pipe. The seam welding head water channel starts from the water hole five on one side, passes through the water inlet pipe to one end of the annular water channel below, is divided into two branches, and then merges at the other end of the annular water channel and extends to the water hole five on the other side through the water outlet pipe.

5. A plate end face seam welding device for a plate heat exchanger according to claim 1 or 2, characterized in that: The number of the conductive plates (3) is four, namely conductive plate one (301), conductive plate two (302), conductive plate three (303) and conductive plate four (304). One end of conductive plate one (301) and conductive plate two (302) are both mounted on conductive plate three (303), conductive plate three (303) is mounted on fixed plate one (308), and the other ends of conductive plate one (301) and conductive plate two (302) are respectively connected to the movable electrode arm (103) and the water-cooling cable; one end of conductive plate four (304) is mounted on the rear end of the fixed electrode arm (104), and the other end is connected to the water-cooling cable; the rear end of the fixed electrode arm (104) is mounted on fixed plate two (307), and fixed plate two (307) and fixed plate one (308) are both mounted in the frame housing (101).

6. A plate end face seam welding device for a plate heat exchanger according to claim 1 or 2, characterized in that: The cooling system comprises a water block (111) and an external water block (112), and the water block (111) and the external water block (112) are both arranged on the frame housing (101); the water block (111) is provided with a water inlet 1 (11101), a water inlet 2 (11103), a water inlet 3 (11102), a water inlet 4 (11104), a water inlet 5 (11112), a water inlet 6 (11111), a water outlet 1 (11106), a water outlet 2 (11108), a water outlet 3 (11105), a water outlet 4 (11107), a water outlet 5 (11110) and a water outlet 6 (11109); the water inlet 1 (11101), the water inlet Water outlet 2 (11103), water outlet 1 (11106) and water outlet 2 (11108) are respectively connected to the external cooling water tank, water inlet 3 (11102) and water inlet 5 (11112) are respectively communicated with water inlet 1 (11101), water inlet 4 (11104) and water inlet 6 (11111) are respectively communicated with water inlet 2 (11103), water outlet 3 (11105) and water outlet 5 (11110) are respectively communicated with water outlet 1 (11106), water outlet 4 (11107) and water outlet 6 (11109) are respectively communicated with water outlet 2 (11108); two external watering ports (113) are provided on the external watering block (112).

7. The plate end face seam welding device for a plate heat exchanger according to claim 4, characterized in that: A positioning block 1 (108) is installed below the front end surface of the movable electrode arm (103), and a positioning groove 1 is provided on the front end surface of the movable electrode arm (103); a positioning block 2 (107) is installed on the front end surface of the fixed electrode arm (104), and a positioning groove 2 is provided on the upper end of the front end surface of the fixed electrode arm (104).

8. The plate end face seam welding device for a plate heat exchanger according to claim 7, characterized in that: A positioning key 1 (20112) is installed on the upper end of the electrode holder 1 (20102) of the seam welding head 1 (201), and the positioning key 1 (20112) is installed in the positioning groove 1 of the movable electrode arm (103). The electrode holder 1 (20102) is installed on the movable electrode arm (103) through the positioning key 1 (20112) and the positioning block 1 (108); a positioning key 2 is installed on the upper end of the electrode holder 2 of the seam welding head 2 (202), and the positioning key 2 is installed in the positioning groove 2 of the fixed electrode arm (104). The electrode holder 2 is installed on the fixed electrode arm (104) through the positioning key 2 and the positioning block 2 (107).

9. The plate end face seam welding device for a plate heat exchanger according to claim 5, characterized in that: The conductive plate 1 (301) is an elastic conductive plate, and two pairs of opposite water holes 3 (305) and water holes 4 (306) are provided on the conductive plate 3 (303). Two opposite water holes 2 (110) are provided at the rear end of the fixed electrode arm (104), and two opposite water holes 1 (109) are provided on the movable electrode arm (103). A straight water channel 1 is provided between the two water holes 3 (305) on the conductive plate 3 (303), and a straight water channel 2 is provided between the two water holes 4 (306) on the conductive plate 3 (303). A straight water channel 3 is provided between the two water holes 1 (109) on the movable electrode arm (103); and a straight water channel 4 is provided between the two water holes 2 (110) on the fixed electrode arm (104).

10. A plate end face seam welding device for a plate heat exchanger according to claim 1 or 2, characterized in that: A limiting screw (106) is installed on the movable electrode arm (103), and the limiting screw (106) is opposite to a limiting block (105) installed on the frame housing (101). The movable electrode arm (103) is limited by the limiting screw (106) and the limiting block (105).

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