Plate heat exchanger plate end face seam welding machine head and welding method

Abstract

The invention relates to a plate end face seam welding machine head of a plate heat exchanger and a welding method, and belongs to the technical field of plate heat exchanger preparation. 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. The lap welding seam formed by the plate end faces of the plate heat exchanger is welded through seam welding, under the condition that the vertical distance between the plate end faces of the plate heat exchanger is small, good pressing and electric conduction can be achieved, automatic welding of the plate end faces is achieved, the production efficiency is high, and the welding quality is stable.

Description

Technical Field

[0001] The invention relates to a plate end face seam welding machine head for a plate type heat exchanger and a welding method, belonging to the technical field of plate type heat exchanger preparation. Background Art

[0002] Plate heat exchanger is a kind of high-efficiency heat exchanger made of a series of metal sheets with certain corrugated shapes. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Plate heat exchanger is an ideal equipment for liquid-liquid and liquid-gas heat exchange. It has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, long service life, etc. It has been widely used in metallurgy, mining, chemical industry, electric power, shipbuilding and other industries.

[0003] The production process of plate heat exchanger mainly includes single-piece stamping, two-piece assembly into pairs, and welding of multiple pairs into Figure 1 The structure shown. Among them, when multiple pairs of plates are welded, the surrounding edges between 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 as small as 18mm, 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 the terminal joints, but in actual production, the gaps between the two plates are often of different sizes, and the size of the misalignment is difficult to guarantee, which is prone 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 has high requirements on the equipment.

[0004] Seam welding refers to a resistance welding method in which the weldment is assembled into an overlap and placed between two roller electrodes, the roller pressurizes the weldment and rotates, and power is continuously or intermittently supplied to form a continuous weld. It is widely used due to its advantages such as high efficiency, high quality, and easy operation, and can make up for the defects of the arc welding method. However, in order to obtain a good welding effect, seam welding has strict requirements on pressure, conductivity, and water cooling. Existing seam welding machines generally use two upper and lower seam welding wheels to symmetrically press vertically on the surface of the workpiece to be welded to ensure the stability of conductivity and pressing. However, for the case where the welding space on the end face of the plate heat exchanger is small, this structure obviously cannot meet its welding requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a plate end face seam welding machine head and a welding method for a plate heat exchanger. The plate end face A of the plate heat exchanger is welded by seam welding. 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 pressing and conductivity can be achieved, and automatic welding of the plate end faces can be achieved. The production efficiency is high, the welding quality is stable, the production cost is low, the skill requirements for operators are reduced, and the problems existing in the background technology are solved.

[0006] The technical solution of the present invention is: A plate end face seam welding machine head 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. The seam welding head 1 and the seam welding head 2 have the same structure and are arranged symmetrically. The seam welding wheel 1 of the seam welding head 1 and the seam welding wheel 2 of the seam welding head 2 are arranged obliquely, and the plate end face A of the plate heat exchanger is horizontally placed between the seam welding wheel 1 and the seam welding wheel 2. A conductive plate is arranged 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, and a movable electrode arm is installed at the lower end of the fixed electrode arm. The seam welding head 1 and the 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. The movement and pressure of the pressurized cylinder are controlled to realize the movement and pressure adjustment of the movable electrode arm, 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 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, 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, and 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 through 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.

[0007] The seam welding head comprises 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, and when the conductive column is worn, the gap between the conductive column and the electrode shaft can be automatically compensated to ensure good conductivity.

[0008] The conductive column is made of chromium-zirconium-copper.

[0009] The electrode seat 1 is provided with a stepped hole, and the electrode shaft 1 is arranged in the stepped hole; a cavity is formed between the electrode shaft 1 and the electrode seat 1, and an insulating sleeve 1 and an insulating sleeve 2 are respectively installed at both ends of the electrode shaft 1 in the cavity, and a bearing 1 is installed between the insulating sleeve 2 and the electrode seat 1. During operation, the electrode shaft 1 and the electrode seat 1 are insulated, and the current is transmitted to the electrode shaft 1 through the electrode seat 1 and the conductive column, and finally transmitted to the seam welding wheel 1.

[0010] A positioning block 1 is installed below the front end surface of the movable electrode arm, and a positioning groove 1 is provided on the front end surface of the movable electrode arm; a positioning block 2 is installed on the front end surface of the fixed electrode arm, and a positioning groove 2 is provided on the upper end of the front end surface of the fixed electrode arm.

[0011] 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 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 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.

[0012] Oil inlet holes are respectively provided on both sides below the electrode seat one, and lubricating oil enters into the cavity between the electrode seat 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 seat one above the pressure cover two, and a seam welding head water circuit is arranged in the electrode seat one, and the seam welding head water circuit includes a water inlet pipe, a ring water circuit and a water outlet pipe, and the water inlet pipe and the water outlet pipe are respectively arranged on both sides of the electrode shaft one, and the ring water circuit is arranged below the electrode shaft one, and both ends of the ring water circuit are respectively connected to the water holes five on both sides through the water inlet pipe and the water outlet pipe, and the seam welding head water circuit starts from the water hole five on one side, passes through the water inlet pipe to one end of the ring water circuit below, is divided into two branches, and then converges at the other end of the ring water circuit and extends to the water hole five on the other side through the water outlet pipe.

[0013] 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 at 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.

[0014] The water-cooling cable is connected to an external power source.

[0015] 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.

[0016] 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 is connected to the electrode shaft through a coupling, and the rotation of the seam welding wheel is realized through the transmission mechanism.

[0017] The frame shell is provided with an electromagnetic valve, which is respectively connected to an external electrical proportional valve and a pressurized cylinder. The movement and pressure of the pressurized cylinder are controlled to realize the movement and pressure adjustment of the movable electrode arm, thereby realizing the tightening and loosening of the seam welding wheel.

[0018] 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, and the movable electrode arm is limited by the limiting screw and the limiting block.

[0019] The seam welding wheel 2 and the seam welding wheel 1 are respectively placed on the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded, and the angle between the seam welding wheel 1 and the seam welding wheel 2 is 120°-130°; the diameter of the seam welding wheel 1 and the seam welding wheel 2 are both 120mm-125mm, and the thickness is 6mm-8mm; the seam welding wheel 1 and the seam welding wheel 2 are both arc surfaces, and the radius of the arc surface is 3-4mm; the seam welding wheel 1 and the seam welding wheel 2 are both made of chromium zirconium copper. Through the above settings, when the vertical distance between the end faces of the heat exchanger plates is small, the two seam welding wheels have good contact with the end face surface of the plate to be welded, ensuring good compression and conductivity. In addition, when the seam welding wheel is worn, it is easy to repair.

[0020] The cooling system comprises a water block and an external water block, both of which are arranged on the frame shell; 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 are arranged on the water block; water inlet 1, water inlet 2, water outlet 1 and water outlet 2 are respectively connected to an 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, water outlet 4 and water outlet 6 are respectively communicated with water outlet 2; two external water outlets are arranged on the external water block.

[0021] A straight water channel 1 is provided between two water holes 3 on the conductive plate 3, and a straight water channel 2 is provided between two water holes 4 on the conductive plate 3. A straight water channel 3 is provided between two water holes 1 on the movable electrode arm, and a straight water channel 4 is provided between two water holes 2 on the fixed electrode arm.

[0022] The fixed electrode arm and the movable electrode arm are both made of brass, and the conductive plate is made of copper.

[0023] The pressurizing force of the pressurizing cylinder is 3000-4000N.

[0024] 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 the 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 end surface A of the plate heat exchanger respectively.

[0025] The pressurized cylinder, external electrical proportional valve, motor and reducer are all well-known and commonly used equipment in the art.

[0026] A method for welding the plate end face of a plate heat exchanger, using the plate end face seam welding head of the plate heat exchanger, comprises the following steps: Place the to-be-welded position of the plate end face A of the plate heat exchanger under the seam welding wheel 2, adjust the external electrical proportional valve and the solenoid valve, control the movement and pressure of the pressurized cylinder, realize the movement and pressure adjustment of the movable electrode arm, make the seam welding wheel 1 contact with the to-be-welded position of the lower surface of the plate end face A of the plate heat exchanger, make the seam welding wheel 2 and the seam welding wheel 1 respectively press the to-be-welded positions of the upper surface and the lower surface of the plate end face A of the plate heat exchanger; the current is transmitted to the conductive plate 4, the fixed electrode arm, the electrode seat 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 end face A of the plate heat exchanger, The seam welding wheel 1, the electrode shaft 1, the conductive column of the seam welding head 1, the electrode holder 1, the movable electrode arm, the conductive plate 1, the conductive plate 3 and the conductive plate 2 are connected to the welding power supply through the water-cooling cable; the cooling water enters the cooling system from the external cooling water tank to cool the fixed electrode arm, the conductive plate 4, the movable electrode arm, the conductive plate 1, the conductive plate 2, the conductive plate 3, the seam welding head 1, the seam welding head 2, the seam welding wheel 1 and the seam welding wheel 2; during welding, the seam welding wheel 1 is driven to rotate by the transmission mechanism and the electrode shaft 1, and the seam welding wheel 2 also rotates at the same time under the action of friction, and the welding of the end face A of the plate heat exchanger is completed under the action of pressure and current.

[0027] The specific cooling steps are as follows: For cooling of the fixed electrode arm and the conductive plate 4: one of the water holes 2 is connected to the water inlet 3 through a water distributor and a water pipe, and the other water hole 2 is connected to the water outlet 3 through a water pipe; the specific cooling method is: the cooling water of the external cooling water tank enters the water inlet 3 from the water inlet 1, flows into one of the water holes 2, the water channel 4 and the other water hole 2 through the water pipe, and then flows into the water outlet 3 and the water outlet 1 in sequence through the water pipe, and then returns to the external cooling water tank; For the cooling of the movable electrode arm, the conductive plate 1, the conductive plate 2 and the conductive plate 3: one of the water holes 1 is connected to the water inlet 4 by a water pipe, another water hole 1 is connected to a water hole 3 by a water pipe, another water hole 3 is connected to one of the water holes 4 by a water pipe, and another water hole 4 is connected to the water outlet 4 by a water pipe; the specific cooling method is: the cooling water of the external cooling water tank enters the water inlet 4 from the water inlet 2, flows into one of the water holes 1, the water channel 3 and the other water hole 1 through the water pipe, and then flows through one of the water holes 3, the water channel 1, the other water hole 3, one of the water holes 4, the water channel 2 and the other water hole 4 through the water pipe, and finally flows into the water outlet 4 and the water outlet 2 through the water pipe and then flows out to the external cooling water tank; The cooling method of the two seam welding heads is as follows: one of the water holes five on the seam welding head one is connected to the water inlet six with a water pipe, and the other water hole five is connected to the water outlet six with a water pipe; the specific cooling method is as follows: the cooling water of the external cooling water tank enters the water inlet six from the water inlet two, flows into one of the water holes five, the water inlet pipeline, the annular water channel, the water outlet pipeline and the other water hole five, and flows out to the external cooling water tank through the water outlet six and the water outlet two; one of the water holes six on the seam welding head two is connected to the water inlet five with a water pipe, and the other water hole six is ​​connected to the water outlet five with a water pipe; the specific cooling method is as follows: the cooling water of the external cooling water tank enters the water inlet five from the water inlet one, flows into one of the water holes six of the seam welding head two, and the circulation method inside the seam welding head two is the same as that of the seam welding head one, 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 and the water outlet one.

[0028] Cooling of the two seam welding wheels: The two external watering ports are connected to the water inlet three through the water distributor and the water pipe. During welding, the cooling water from the external cooling water tank enters the water inlet three from the water inlet one, enters the two external watering ports through the water distributor and the water pipe, and then flows directly to the two seam welding wheels respectively to cool the two seam welding wheels.

[0029] The beneficial effects of the present invention 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 pressing and conductivity can be achieved, and automatic welding of the plate end faces can be achieved. The production efficiency is high, the welding quality is stable, the production cost is low, and the skill requirements for operators are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the workpiece to be welded on the end face of a plate heat exchanger; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is the front view of the present invention; Figure 4 It is a schematic diagram of the structure inside the rack housing of the present invention; Figure 5 It is a rear view of the present invention; Figure 6 This is an axial view of the present invention; Figure 7 This is a schematic diagram of the structure of the seam welding head of the present invention; Figure 8 This is a front view of the seam welding head of the present invention; Fig. 9 It is an internal cross-sectional view of the present invention; Fig.10 for Figure 8 DD direction schematic diagram; Fig.11 for Figure 8 CC direction schematic diagram; Fig.12 This is a schematic diagram of the annular waterway structure of the present invention; Fig.13 It is a schematic diagram of the structure of the seam welding wheel of the present invention; Fig.14 It is a schematic diagram of the transmission mechanism structure of the present invention; Fig.15 This is a schematic diagram of the water block structure of the present invention; 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 pipeline 20115, water outlet pipeline 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

[0031] The present invention will be further described below by way of examples in conjunction with the accompanying drawings.

[0032] A plate end seam welding head 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, a seam welding head 201 and a seam welding head 202. The seam welding head 201 and the seam welding head 202 have the same structure and are symmetrically arranged. The seam welding wheel 1 20101 of the seam welding head 201 and the seam welding wheel 2 20201 of the seam welding head 202 are both arranged obliquely, and the plate end face A of the plate heat exchanger is horizontally placed between the seam welding wheel 1 20101 and the 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, and a movable electrode arm 103 is installed at the lower end of the fixed electrode arm 104. The seam welding head 1 201 and the seam welding head 2 202 are respectively installed on the movable electrode arm 103 and the fixed electrode arm 104. The front end of the pole arm 104; the 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 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 an external cooling water tank and 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, and the seam welding wheel 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 through 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.

[0033] 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 20109 are sequentially installed in each mounting hole from the outside to the inside. 110, the conductive column 20110 is tightly attached to the electrode seat 20102, and 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 pressure cover 20108 to make the conductive column 20110 contact with the electrode shaft 20103. When the conductive column 20110 is worn, the gap between the conductive column 20110 and the electrode shaft 20103 can be automatically compensated to ensure good conductivity.

[0034] The conductive column 20110 is made of chromium-zirconium-copper.

[0035] The electrode holder 1 20102 is provided with a stepped hole, 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 holder 1 20102, and an insulating sleeve 1 20106 and an insulating sleeve 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 20105 and the electrode holder 1 20102. During operation, the electrode shaft 1 20103 is insulated from the electrode holder 1 20102, and the current is transmitted to the electrode shaft 1 20103 through the electrode holder 1 20102 and the conductive column 20110, and finally transmitted to the seam welding wheel 1 20101.

[0036] 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.

[0037] 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, and the seam welding head 202 and the fixed electrode arm 104.

[0038] The electrode holder 20102 has oil inlet holes 20111 on both sides below, and the lubricating oil enters the cavity between the electrode holder 20102 and the electrode shaft 20103 through the oil inlet holes 20111 to lubricate the electrode shaft 20103 and reduce transmission wear; the electrode holder 20102 has water holes 20113 on both sides above the gland 20108, and the electrode holder is provided with a seam welding head water path, which includes a water inlet pipe 20115, a ring water path 2011 4 and 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 5 on one side through the water inlet pipe to one end of the annular water channel below, is divided into two branches, and then gathers at the other end of the annular water channel and extends to the water hole 5 on the other side through the water outlet pipe.

[0039] 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 ends of conductive plate 1 301 and conductive plate 2 302 are both mounted on conductive plate 3 303, conductive plate 3 303 is mounted on fixed plate 1 308, and 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 frame housing 101.

[0040] The water-cooling cable is connected to an external power source.

[0041] The conductive plate 1 301 is an elastic conductive plate, 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.

[0042] The transmission mechanism 5 includes a motor 501, a reducer 502 and a chassis 503, wherein the motor 501 and the reducer 502 are connected, the reducer 502 is mounted on the chassis 503, and the chassis 503 is mounted on the fixed electrode arm 104; a transmission shaft 505 is also mounted 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.

[0043] 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 pressurized cylinder 102 respectively. By controlling the movement and pressure of the pressurized cylinder 102, the movement and pressure adjustment of the movable electrode arm 103 are realized, thereby realizing the tightening and loosening of the seam welding wheel 20101.

[0044] The movable electrode arm 103 is provided with a limiting screw 106 , which is opposite to a limiting block 105 provided on the frame housing 101 . The movable electrode arm 103 is limited by the limiting screw 106 and the limiting block 105 .

[0045] The seam welding wheel 20201 and the seam welding wheel 1 20101 are respectively placed on the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded, and the angle between the seam welding wheel 1 20101 and the seam welding wheel 2 20201 is 120°-130°; the diameter D1 of the seam welding wheel 1 20101 and the seam welding wheel 2 20201 are both 120mm-125mm, and the thickness t is both 6mm-8mm; the seam welding wheel 1 20101 and the seam welding wheel 2 20201 are both arc surfaces, and the radius R1 of the arc surface is 3-4mm; the seam welding wheel 1 20101 and the seam welding wheel 2 20201 are both made of chromium zirconium copper. Through the above settings, when the vertical distance between the end faces of the heat exchanger plates is small, the two seam welding wheels have good contact with the end face surface of the plate to be welded, ensuring good compression and conductivity. In addition, when the seam welding wheel is worn, it is easy to repair.

[0046] 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 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 11101, the water inlet 2 11103, the water inlet 3 11102, the water inlet 4 11104, the water inlet 5 11112, the water inlet 6 11111 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.

[0047] A straight water channel 1 is provided between two water holes 305 on the conductive plate 303, and a straight water channel 2 is provided between two water holes 406 on the conductive plate 303. A straight water channel 3 is provided between two water holes 109 on the movable electrode arm 103; and a straight water channel 4 is provided between two water holes 2 110 on the fixed electrode arm 104.

[0048] 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.

[0049] The pressurizing force of the pressurizing cylinder 102 is 3000-4000N.

[0050] 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 the 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 end surface A of the plate heat exchanger respectively.

[0051] The pressurizing cylinder 102, the external electrical proportional valve, the motor 501 and the reducer 502 are all well-known and commonly used equipment in the art.

[0052] A method for welding the plate end face of a plate heat exchanger, using the plate end face seam welding head of the plate heat exchanger, comprises the following steps: Place the plate end face A of the plate heat exchanger to be welded under the seam welding wheel 20201, adjust the external electrical proportional valve and the solenoid valve 4, control the action and pressure of the pressurized cylinder 102, realize the action and pressure adjustment of the movable electrode arm 103, make the seam welding wheel 1 20101 contact with the plate end face A of the plate heat exchanger to be welded, make the seam welding wheel 2 20201 and the seam welding wheel 1 20101 respectively press 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 to the conductive plate 4 304, the fixed electrode arm 104, the electrode seat 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, the electrode shaft 1 20103, the seam welding wheel 2 The conductive column of the welding head 1, the electrode holder 1 20102, the movable electrode arm 103, the conductive plate 1 301, the conductive plate 3 303 and the conductive plate 2 302 are connected to the welding power supply through a water-cooling cable; the cooling water enters the cooling system from the external cooling water tank to cool the fixed electrode arm 104, the conductive plate 4 304, the movable electrode arm 103, the conductive plate 1 301, the conductive plate 2 302, the conductive plate 3 303, the seam welding head 1 201, the seam welding head 2 202, the seam welding wheel 1 20101 and the 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.

[0053] The specific cooling steps are as follows: 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: the cooling water of the external cooling water tank enters the water inlet 3 11102 from the water inlet 1 11101, flows into one of the water holes 2 110, the water channel 4 and the other water hole 2 110 through the water pipe, and then flows into the water outlet 3 11105 and the water outlet 1 11106 in sequence, and then returns to the external cooling water tank; For 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 four 11104 from the water inlet two 11103, flows into one of the water holes one 109, water channel three and another water hole one 109 through the water pipe, then flows through one of the water holes three 305, water channel one, another water hole three 305, one of the water holes four 306, water channel two and another water hole four 306 through the water pipe, and finally flows into the water outlet four 11107 and the water outlet two 11108 through the water pipe and then flows out to the external cooling water tank; Cooling method of two seam welding heads: one of the water holes 5 20113 on the seam welding head 1 201 is connected with the water inlet 6 11111 by a water pipe, and the other water hole 5 20113 is connected with the water outlet 6 11109 by a water pipe; the specific cooling method is: the cooling water of 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 pipeline 20115, the annular water channel 20114, the water outlet pipeline 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 by a water pipe, and the other water hole six is ​​connected to the water outlet five 11110 by 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 the circulation method inside the seam welding head two 202 is the same as that of 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.

[0054] 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 respectively to cool the two seam welding wheels.

Claims

1. A plate end face seam welding head 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). The seam welding head 1 (201) and the seam welding head 2 (202) have the same structure and are arranged symmetrically. The seam welding wheel 1 (20101) of the seam welding head 1 (201) and the seam welding wheel 2 (2201) of the seam welding head 2 (202) are both arranged obliquely. The seam welding wheel 1 (20101) ) and the second seam welding wheel (20201) are horizontally placed with a plate end face A of a plate heat exchanger; 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 first seam welding head (201) and the second seam welding head (202) are respectively installed at the movable electrode arm (103) and the fixed electrode arm (104). The front end of the arm (104) is provided with a pressurizing cylinder (102) at the lower end of the frame housing (101), and the pressurizing cylinder (102) is hinged to the lower end of the movable electrode arm (103). By controlling the movement and pressure of the pressurizing cylinder (102), the movement and pressure adjustment of the movable electrode arm (103) are achieved, so that the seam welding wheel 2 (20201) of the seam welding head 2 (202) and the seam welding wheel 1 (20101) of the seam welding head 1 (201) are respectively connected to the upper surface and the lower surface of the plate end face A of the plate heat exchanger to be welded. The frame (1) is mounted and pressed; a cooling system is installed on the frame (1), the cooling system is connected to an external cooling water tank, and cooling is performed through the cooling system; a transmission mechanism (5) is installed on the fixed electrode arm (104), the transmission mechanism (5) is connected to the second seam welding head (202), and the transmission mechanism (5) drives the second seam welding wheel (20201) of the second seam welding head (202) and the first seam welding wheel (20101) of the first seam welding head (201) to rotate, thereby completing the welding of the plate end face A of the plate heat exchanger under the action of pressure and current.

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

3. A plate end face seam welding head 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. A plate end face seam welding head 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 seat 1 (20102), and lubricating oil enters into the cavity between the electrode seat 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 seat 1 (20102) above the pressure cap 2 (20108), and a seam welding head water path is provided in the electrode seat 1, and the seam welding head water path includes a water inlet pipeline (20115), a ring water path (2011 4) and a 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, and 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 is gathered 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 head 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 head for a plate heat exchanger according to claim 2, characterized in that: The transmission mechanism (5) comprises a motor (501), a reducer (502) and a chassis (503); the motor (501) and the reducer (502) are connected, the reducer (502) is mounted on the chassis (503), and the chassis (503) is mounted 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 1 (20103) through a coupling, and the rotation of the seam welding wheel 1 is realized through the transmission mechanism.

7. A plate end face seam welding head for a plate heat exchanger according to claim 1 or 2, characterized in that: The frame housing (101) is provided with a solenoid valve (4), which is respectively connected to an external electrical proportional valve and a pressurized cylinder (102).

8. A plate end face seam welding head 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), wherein the water block (111) and the external water block (112) are both arranged on a frame housing (101); 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) are arranged on the water block (1111); Water outlet 2 (11103), water outlet 1 (11106) and water outlet 2 (11108) are respectively connected to an external cooling water tank, water inlet 3 (11102) and water inlet 5 (11112) are respectively connected to water inlet 1 (11101), water inlet 4 (11104) and water inlet 6 (11111) are respectively connected to water inlet 2 (11103), water outlet 3 (11105) and water outlet 5 (11110) are respectively connected to water outlet 1 (11106), water outlet 4 (11107) and water outlet 6 (11109) are respectively connected to water outlet 2 (11108); two external watering ports (113) are provided on the external watering block (112).

9. A method for welding the plate end face of a plate heat exchanger, using the plate end face seam welding head of the plate heat exchanger according to any one of claims 1 to 8, comprising the following steps: The plate end face A of the plate heat exchanger to be welded is placed below the seam welding wheel 2 (2201), and the external electrical proportional valve and the solenoid valve (4) are adjusted to control the movement and pressure of the pressurized cylinder (102), so as to realize the movement and pressure adjustment of the movable electrode arm (103), so that the seam welding wheel 1 (20101) 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 (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 seat 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), the electrode shaft 1 (20103), and the conductive column of the seam welding head 1. The electrode column, electrode holder 1 (20102), movable electrode arm (103), conductive plate 1 (301), conductive plate 3 (303) and conductive plate 2 (302) are connected to the welding power source through a water-cooling cable; cooling water enters the cooling system from an 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 (2201); during welding, the seam welding wheel 1 (20101) is driven to rotate by the transmission mechanism (5) and the electrode shaft 1 (20103); 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.

10. A method for welding the end surface of a plate heat exchanger according to claim 9, characterized in that The specific cooling steps are as follows: For cooling the fixed electrode arm (104) and the conductive plate four (304): one of the water holes two (110) is connected to the water inlet three (11102) via a water distributor and a water pipe, and the other water hole two (110) is connected to the water outlet three (11105) via a water pipe; the specific cooling method is: the cooling water of the external cooling water tank enters the water inlet three (11102) from the water inlet one (11101), flows into one of the water holes two (110), the water channel four and the other water hole two (110) through the water pipe, and then flows into the water outlet three (11105) and the water outlet one (11106) in sequence, and then returns to the external cooling water tank; For 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 1 (109) is connected to the water inlet 4 (11104) by a water pipe, another water hole 1 (109) is connected to a water hole 3 (305) by a water pipe, another water hole 3 (305) is connected to one of the water holes 4 (306) by a water pipe, and another water hole 4 (306) is connected to the water outlet 4 (11107) by a water pipe; the specific cooling method is: : The cooling water of the external cooling water tank enters the water inlet four (11104) from the water inlet two (11103), flows into one of the water holes one (109), water channel three and another water hole one (109) through the water pipe, then flows through one of the water holes three (305), water channel one, another water hole three (305), one of the water holes four (306), water channel two and another water hole four (306) through the water pipe, and finally flows into the water outlet four (11107) and the water outlet two (11108) through the water pipe before flowing out to the external cooling water tank; The cooling method of the two seam welding heads is as follows: one of the water holes five (20113) on the seam welding head one (201) is connected to the water inlet six (11111) by a water pipe, and the other water hole five (20113) is connected to the water outlet six (11109) by a water pipe; the specific cooling method is as follows: the cooling water of the external cooling water tank enters the water inlet six (11111) from the water inlet two (11103), flows into one of the water holes five (20113), the water inlet pipeline (20115), the annular water channel (20114), the water outlet pipeline (20116) and the other water hole five (20113), and passes through the water outlet six (11109) and the water outlet two (11109). 108) flows out to an 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) by a water pipe, and the other water hole six is ​​connected to the water outlet five (11110) by 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), circulates in the same way as the seam welding head one (201), 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); 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, cooling water from an 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 respectively to cool the two seam welding wheels.

Images