Plate end face seam welding head for plate heat exchanger

Abstract

The utility model relates to a plate end face seam welding head for a plate heat exchanger and belongs to the technical field of plate heat exchanger manufacturing. According to the technical scheme, an electrode shaft is mounted in an electrode holder; a first gland is installed at one end of the electrode shaft, and a seam welding wheel is installed at the other end of the electrode shaft, obliquely arranged at the front end of the rack and parallel to the electrode base. Mounting holes are formed in the two sides of the electrode base respectively, a second gland, a spring and a conductive column are sequentially mounted in each mounting hole from outside to inside, the conductive columns are tightly attached to the electrode base, the ends, close to the electrode shaft, of the conductive columns are arc surfaces and matched with the electrode shaft, and the springs are pressed by rotating the second glands, so that the conductive columns are in contact with the electrode shaft. The automatic welding machine has the advantages that the two seam welding wheels obliquely arranged at the front end of the rack are adopted to weld lap welding seams formed on the plate end faces of the plate heat exchanger, and under the condition that the vertical distance between the plate end faces of the plate heat exchanger is small, good pressing can be achieved, automatic welding of the plate end faces is achieved, and the welding quality is stable.

Description

Technical Field

[0001] The utility model relates to a plate end face seam welding head of a plate type heat exchanger, belonging to the technical field of plate type 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. When multiple pairs of plates are welded together, the edges around the two plates must be welded together to achieve good airtightness. The plate end face A in the figure represents the plate end face formed by welding two plates together. However, the vertical distance between plate end face A and the upper plate end face B is as little as 18 mm, leaving limited space for welding.

[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 press the workpieces while rotating, applying power continuously or intermittently to form a continuous weld seam. It is widely used due to its advantages of high efficiency, high quality, and ease of operation. However, existing seam welding machines generally use two symmetrical, vertically pressed rollers on the workpiece surface to ensure stable pressure. However, this seam welding roller structure clearly cannot meet the welding requirements of plate heat exchangers, where welding space is limited. Utility Model Content

[0005] The purpose of the utility model is to provide a plate end face seam welding head for a plate heat exchanger, which adopts two seam welding wheels arranged obliquely at the front end of a frame to weld the plate end face A of the plate heat exchanger. 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 with stable welding quality, thereby solving the problems existing in the background technology.

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

[0007] A plate end face seam welding head for a plate heat exchanger comprises two seam welding heads, which have the same structure and are symmetrically arranged at the front end of a frame; the seam welding head comprises a seam welding wheel and an electrode holder, and an electrode shaft is installed inside the electrode holder; a pressure cap is installed at one end of the electrode shaft, and a seam welding wheel is installed at the other end, the seam welding wheel is arranged obliquely at the front end of the frame, and the seam welding wheel and the electrode holder are parallel to each other; mounting holes are respectively provided on both sides of the electrode holder, 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 holder, 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, so that the conductive column is in 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.

[0008] The electrode holder has a stepped hole, and the electrode shaft is positioned within the stepped hole. A cavity is formed between the electrode shaft and the electrode holder. Insulation sleeves 1 and 2 are mounted at either end of the electrode shaft within the cavity, and a bearing is installed between the insulation sleeve 2 and the electrode holder. During operation, the electrode shaft and the electrode holder are insulated, and current is transferred from the electrode holder to the electrode shaft via the conductive column and ultimately to the seam welding wheel.

[0009] A positioning key is installed on the upper end of the electrode holder, and a positioning slot is provided on the frame. The positioning key is installed in the positioning slot, and the electrode holder is installed on the frame through the positioning key and the positioning slot, thereby realizing the positioning installation of the electrode holder and the frame.

[0010] Oil inlet holes are respectively provided on both sides of the lower side of the electrode holder, and lubricating oil enters the cavity between the electrode holder and the electrode shaft through the oil inlet holes to lubricate the electrode shaft and reduce transmission wear.

[0011] Water holes are respectively provided on both sides of the electrode holder above the second pressure cover, and a seam welding head water channel is provided in the electrode holder, and the seam welding head water channel includes a water inlet pipe, a ring water channel and a water outlet pipe. The water inlet pipe and the water outlet pipe are respectively provided on both sides of the electrode shaft, and the ring water channel is provided below the electrode shaft. Both ends of the ring water channel are respectively connected to the water holes on both sides through the water inlet pipe and the water outlet pipe. The seam welding head water channel starts from a water hole on one side, passes through the water inlet pipe, and is divided into two branches at one end of the ring water channel below, and then converges at the other end of the ring water channel and extends to the water hole on the other side through the water outlet pipe.

[0012] The electrode shaft is connected to a transmission mechanism, and the rotation of the seam welding wheel is realized through the transmission mechanism.

[0013] The two seam welding wheels of the seam welding head 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 two seam welding wheels is 120°-130°.

[0014] The seam welding wheels have a diameter of 120mm-125mm and a thickness of 6mm-8mm. They have arc-shaped surfaces with a radius of 3-4mm and are made of chromium-zirconium copper. This arrangement ensures good contact between the two seam welding wheels and the end surfaces of the heat exchanger plates, ensuring tight contact and good electrical conductivity, even when the vertical distance between the end surfaces is small. Furthermore, wear of the seam welding wheels is easily repairable.

[0015] The conductive column is made of chromium-zirconium-copper.

[0016] 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.

[0017] The beneficial effects of the utility model are as follows: two seam welding wheels arranged obliquely at the front end of the frame are used to weld the lap welds formed on the end faces 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, automatic welding of the plate end faces is realized, and the welding quality is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the workpiece to be welded on the end face of the plate heat exchanger;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model;

[0020] Figure 3 This is the main view of the utility model;

[0021] Figure 4 This is an internal cross-sectional view of the utility model;

[0022] Figure 5 for Figure 3 DD direction schematic diagram;

[0023] Figure 6 for Figure 3 CC direction schematic diagram;

[0024] Figure 7 This is a schematic diagram of the annular waterway structure of the utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the seam welding wheel of the utility model;

[0026] Figure 9 This is a state diagram for the use of the utility model;

[0027] In the figure: frame 1, seam welding head 2, seam welding wheel 20101, electrode holder 20102, electrode shaft 20103, bearing 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 20112, water hole 20113, annular water channel 20114, water inlet pipe 20115, water outlet pipe 20116. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0029] A plate end face seam welding head for a plate heat exchanger, comprising two seam welding heads 2, the two seam welding heads 2 having the same structure and being symmetrically arranged at the front end of a frame 1; the seam welding head 2 comprising a seam welding wheel 20101 and an electrode holder 20102, an electrode shaft 20103 being installed inside the electrode holder 20102; a gland 20107 being installed at one end of the electrode shaft 20103, and a seam welding wheel 20101 being installed at the other end, the seam welding wheel 20101 being arranged obliquely at the front end of the frame 1, the seam welding wheel 20101 and the electrode holder 20102 being parallel to each other; mounting holes are respectively provided on both sides of the electrode holder 20102, each mounting hole being provided on the other side of the electrode holder 20102; The second pressure cover 20108, the spring 20109 and the conductive column 20110 are installed in the mounting hole from the outside to the inside in sequence. The conductive column 20110 is in close contact with 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 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.

[0030] The electrode holder 20102 has a stepped hole, and the electrode shaft 20103 is disposed within the stepped hole. A cavity is formed between the electrode shaft 20103 and the electrode holder 20102. Insulation sleeves 1 20106 and 20105 are mounted at either end of the electrode shaft 20103 within the cavity. A bearing 20104 is mounted between the insulation sleeve 20105 and the electrode holder 20102. During operation, the electrode shaft 20103 is insulated from the electrode holder 20102. Current is transmitted through the electrode holder 20102, via the conductive column 20110, to the electrode shaft 20103, and ultimately to the seam welding wheel 20101.

[0031] A positioning key 20112 is installed at the upper end of the electrode holder 20102, and a positioning groove is provided on the frame 1. The positioning key 20112 is installed in the positioning groove. The electrode holder 20102 is installed on the frame 1 through the positioning key 20112 and the positioning groove, thereby realizing the positioning installation of the electrode holder 20102 and the frame 1.

[0032] Oil inlet holes 20111 are respectively provided on both sides of the bottom of the electrode holder 20102 , 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.

[0033] Water holes 20113 are respectively provided on both sides of the electrode holder 20102 above the second pressure cover 20108, and a seam welding head water channel is arranged in the electrode holder, and the seam welding head water channel includes a water inlet pipe 20115, a ring water channel 20114 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 shaft 20103, and the ring water channel 20114 is arranged below the electrode shaft 20103. Both ends of the ring water channel are respectively connected to the water holes 20113 on both sides through the water inlet pipe and the water outlet pipe. The seam welding head water channel starts from a water hole on one side, passes through the water inlet pipe, and is divided into two branches at one end of the ring water channel below, and then converges at the other end of the ring water channel and extends to the water hole on the other side through the water outlet pipe.

[0034] The electrode shaft 20103 is connected to a transmission mechanism, and the rotation of the seam welding wheel is realized through the transmission mechanism.

[0035] The two seam welding wheels 20101 of the seam welding head 2 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 two seam welding wheels 20101 is 120°-130°;

[0036] The seam welding wheels 20101 have a diameter D1 of 120-125 mm and a thickness t of 6-8 mm. They have an arc-shaped surface with a radius R1 of 3-4 mm. They are made of chromium-zirconium copper. This arrangement ensures good contact between the two seam welding wheels and the end surfaces of the heat exchanger plates, ensuring tight contact and good electrical conductivity, even when the vertical distance between the end surfaces is small. Furthermore, wear of the seam welding wheels is easily repairable.

[0037] The conductive column 20110 is made of chromium-zirconium-copper.

[0038] 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.

[0039] In actual application, the end face A of the plate heat exchanger is placed between two seam welding wheels 20101, so that the two seam welding wheels 20101 are respectively pressed against the upper and lower surfaces of the plate heat exchanger end face A to be welded; during welding, the lower seam welding wheel 20101 is driven to rotate by the transmission mechanism and the electrode shaft 20103, and under the action of friction, the upper seam welding wheel 20101 also rotates at the same time, and the welding of the end faces of the two plate heat exchanger plates A is completed under the action of pressure and current.

[0040] The utility model adopts two seam welding wheels obliquely arranged at the front end of the frame to weld the lap welds formed on the end faces of the plate heat exchanger. The structure is simple. When the vertical distance between the end faces of the plate heat exchanger is small, good compression and conductivity can be achieved, and automatic welding of the plate end faces is realized. The welding quality is stable, the production efficiency is high, the production cost is low, and the skill requirements of the operator are reduced.

Claims

1. A plate end face seam weld head for a plate heat exchanger, characterized in that: The invention comprises two seam welding heads (2), the two seam welding heads (2) have the same structure and are symmetrically arranged at the front end of the frame (1); the seam welding heads (2) comprise a seam welding wheel (20101) and an electrode holder (20102), and the 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) is arranged obliquely at the front end of the frame (1), 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 seat (20102), and a second pressure cap (20108), a spring (20109) and a conductive column (20110) are sequentially installed in each mounting hole from the outside to the inside. The conductive column (20110) is in close contact with the electrode seat (20102), and one end of the conductive column (20110) close to the electrode shaft (20103) is an arc surface that matches the electrode shaft (20103). By rotating the second pressure cap (20108) to compress the spring (20109), the conductive column (20110) is brought into contact with the electrode shaft (20103).

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

3. A plate end face seam welder for a plate heat exchanger according to claim 1 or 2, characterized in that: A positioning key (20112) is installed on the upper end of the electrode holder (20102), a positioning slot is provided on the frame (1), the positioning key (20112) is installed in the positioning slot, and the electrode holder (20102) is installed on the frame (1) via the positioning key (20112) and the positioning slot.

4. The plate end face seam welder for a plate heat exchanger according to claim 2, characterized in that: Oil inlet holes (20111) are respectively provided on both sides below the electrode holder (20102).

5. A plate end face seam welder for a plate heat exchanger according to claim 1 or 2, characterized in that: Water holes (20113) are respectively provided on both sides of the electrode holder (20102) above the second gland (20108); a seam welding head water path is provided in the electrode holder, and the seam welding head water path comprises a water inlet pipe (20115), a ring water path (20114) and a water outlet pipe (20116); the water inlet pipe (20115) and the water outlet pipe (20116) are respectively provided on both sides of the electrode shaft (20103); the ring water path (20114) is provided below the electrode shaft (20103); both ends of the ring water path are respectively connected to the water holes (20113) on both sides through the water inlet pipe and the water outlet pipe; the seam welding head water path starts from a water hole on one side, passes through the water inlet pipe, and is divided into two branches at one end of the ring water path below, and then is merged at the other end of the ring water path and extends to the water hole on the other side through the water outlet pipe.

6. A plate end seam welder for a plate heat exchanger according to claim 1 or 2, characterized in that: The electrode shaft (20103) is connected to the transmission mechanism.

7. A plate end seam weld head for a plate heat exchanger according to claim 1 or 2, characterized in that: The seam welding wheels (20101) of the two seam welding heads (2) are respectively placed at the upper surface and lower surface of the plate end face A of the plate heat exchanger to be welded, and the angle between the two seam welding wheels (20101) is 120°-130°.

8. A plate end seam weld head for a plate heat exchanger according to claim 1 or 2, characterized in that: The diameter of the seam welding wheel (20101) is 120 mm to 125 mm, and the thickness is 6 mm to 8 mm; the seam welding wheel (20101) is an arc surface, and the radius of the arc surface is 3 to 4 mm.

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