Dialyzer end cover welding device and equipment

Abstract

The utility model discloses a dialyzer end cover welding device and equipment, the welding device comprises an end cover driving mechanism, a shell positioning mechanism and a heating mechanism which are all installed on a main base plate, the end cover driving mechanism comprises a holding claw and a first driving assembly driving the holding claw to move, the shell positioning mechanism comprises a supporting block installed on the main base plate and a clamping block installed on a second driving assembly, the heating mechanism comprises two ironing plates and a third driving assembly for driving the two ironing plates to move, and after a dialyzer shell is positioned on the shell positioning mechanism, the dialyzer shell can be heated to the normal temperature. A third driving assembly drives the two ironing plates to move synchronously and oppositely and heat the welding end of the dialyzer shell, and after heating is completed, the first driving assembly drives the dialyzer end cover grabbed by the holding claws to move, so that the corresponding ends of the dialyzer end cover and the dialyzer shell abut against each other; according to the dialyzer shell and end cover welding device, the dialyzer shell and the end cover are positioned ingeniously, and the welding precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic state material forming equipment, in particular to a dialyzer end cover welding device and equipment. Background Art

[0002] The dialyzer is a device used for continuous renal replacement therapy. It mainly uses the principle of semipermeable membrane to introduce the patient's blood and dialysate into the dialyzer at the same time. The two flow in opposite directions on both sides of the dialyzer membrane, with the help of the solute gradient, osmotic gradient and water pressure gradient on both sides of the membrane, to remove toxins and excess water retained in the body, while replenishing the body's needed substances.

[0003] The structure of the dialyzer mainly includes an external shell, a wire bundle composed of several dialysis membranes installed inside the shell, and end caps sealed at both ends of the shell. The wire bundle is installed inside the shell by glue injection, and then the end caps are installed at both ends of the shell. In the production process of the dialyzer, the end caps are mainly connected to the shell by hot melt welding. This process requires the use of corresponding devices or jigs to be completed according to production standards. However, the jigs in the prior art are relatively simple, with poor positioning accuracy and low welding quality. They cannot handle insulation and cooling and smoke problems well, have many defects and poor efficiency, and have unsatisfactory reliability and stability, which seriously affects the stability of product quality and makes it difficult to form standardized operating specifications and processes for the production of dialyzers, unable to meet the standardized, normalized and automated production needs of enterprises, and is not conducive to the efficient and sustainable development of enterprises. Therefore, there is an urgent need for a stable and reliable welding device to meet the needs of dialyzer production and assembly. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the utility model provides a welding device and equipment with high positioning accuracy and good welding quality for a dialyzer shell and an end cover.

[0005] The specific contents are as follows:

[0006] A dialyzer end cover welding device, comprising:

[0007] An end cap driving mechanism, the end cap driving mechanism comprising a claw and a first driving assembly for driving the claw to move, the claw being used to grab the dialyzer end cap to be welded;

[0008] A housing positioning mechanism, the housing positioning mechanism comprising a support block mounted on the main base plate and a clamping block mounted on the second drive assembly, the second drive assembly driving the clamping block to position the dialyzer housing to be welded on the support block;

[0009] A heating mechanism, the heating mechanism is arranged between the end cover driving mechanism and the shell positioning mechanism, the heating mechanism comprises two ironing plates and a third driving assembly driving the two ironing plates to move synchronously towards or in opposite directions, the ironing plates are provided with notches matching the ends to be welded of the dialyzer shell;

[0010] After the dialyzer shell is positioned on the shell positioning mechanism, the third driving assembly drives the two ironing plates to move synchronously toward each other and heat the welding end of the dialyzer shell. After the heating is completed, the first driving assembly drives the dialyzer end cover grasped by the claw to move, so that the dialyzer end cover and the dialyzer shell's corresponding ends collide with each other, and the two are welded together through the heated and melted body.

[0011] Preferably, the first driving assembly includes a linear module, a material picking cylinder and a finger cylinder, the linear module is fixed on the main substrate, the material picking cylinder is installed on the linear module, the finger cylinder is installed on the material picking cylinder, and the claw is installed on the finger cylinder.

[0012] Preferably, the gripping claw comprises two semi-cylindrical claw monomers, which are respectively mounted on two driving components of the finger cylinder, and the finger cylinder drives the two claw monomers to move synchronously toward each other to grab the dialyzer end cover.

[0013] Preferably, it also includes a feeding mechanism installed on the main substrate, and the feeding mechanism is used to move the dialyzer end cover to the material picking position of the end cover driving mechanism. The feeding mechanism includes a translation cylinder and a carrier plate installed on the translation cylinder, and the carrier plate is provided with a positioning boss for positioning the dialyzer end cover and a limit plate with a groove.

[0014] Preferably, the second driving assembly includes a first double-outlet cylinder installed on the main base plate, and driving arms symmetrically installed on the two driving parts of the first double-outlet cylinder, and the clamping blocks are installed on both driving arms. The two clamping blocks are both quarter-cylindrical in shape, and the supporting blocks are both semi-cylindrical in shape. The two clamping blocks and the supporting blocks are coaxial to form a cylindrical shape that matches the main cylinder of the dialyzer shell.

[0015] Preferably, it also includes a pre-positioning mechanism, which includes a pad fixed on the cylinder body of the first double-outlet cylinder and a clamp symmetrically hinged on the pad, the pad is provided with a support platform with a circular arc surface, the inner side of the clamp is provided with a circular arc surface matching the main cylinder body of the dialyzer shell, an elastic band is tightened between the roots of the two clamps, and the elastic force of the elastic band drives the two clamps to swing toward each other to clamp the dialyzer shell, and a reverse slope is also provided on the top of the clamp to facilitate the dialyzer shell to slide between the two clamps.

[0016] Preferably, the third driving assembly includes a second double-head cylinder installed on the main base plate, a driving block symmetrically installed on the two driving parts of the second double-head cylinder, an insulating block is installed on the driving block, the ironing plate is installed on the insulating block, a gap is provided between the ironing plate and the insulating block, and a heating block is installed on the ironing plate.

[0017] Preferably, a cooling channel is provided inside the heat insulation block, two ports of the cooling channel are connected to a water circulation system, and a smoke hood is also installed on the driving block.

[0018] Preferably, it also includes a pull-down mechanism, which includes a lifting cylinder installed on the main base plate and a clamping claw cylinder installed on the lifting cylinder, and clamping units are installed on both driving components of the clamping claw cylinder.

[0019] A dialyzer end cover welding device comprises the above-mentioned dialyzer end cover welding device.

[0020] The beneficial effects of the utility model include at least:

[0021] Firstly, the utility model can accurately position the dialyzer shell to ensure the welding quality through the cooperation of the shell positioning mechanism and the pull-down mechanism, and at the same time, a pre-positioning mechanism for the shell is also provided, making loading and unloading more convenient and safer; secondly, a heat insulation block is provided on the heating mechanism of the utility model, and a gap is provided between the heat insulation block and the ironing plate. At the same time, a cooling channel is provided inside the heat insulation block, which can carry out circulating water cooling to effectively prevent the problem of excessive temperature of the equipment after long-term work, and the heat insulation block has a protective function to avoid burns to personnel. A smoke hood is also installed on the driving block, which can effectively and timely discharge the smoke generated during the welding process. Therefore, the utility model can realize accurate positioning of the dialyzer shell and the end cover, ensuring the welding quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the end cover welding device in the embodiment;

[0023] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the middle end cover driving mechanism;

[0024] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the feeding mechanism;

[0025] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the middle shell positioning mechanism and the pre-positioning mechanism Figure 1 ;

[0026] Figure 5 for Figure 1Schematic diagram of the three-dimensional structure of the middle shell positioning mechanism and the pre-positioning mechanism Figure 2 ;

[0027] Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure of the central pre-positioning mechanism;

[0028] Figure 7 for Figure 1 A schematic diagram of the three-dimensional structure of the middle and lower pull-down mechanism;

[0029] Figure 8 for Figure 1 A schematic diagram of the three-dimensional structure of the heating mechanism;

[0030] Fig. 9 for Figure 8 Top view after removing the smoke hood;

[0031] Fig.10 A cross-sectional view of the dialyzer housing and end caps being heated by the ironing board;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the end cover welding equipment in the embodiment;

[0033] Description of the numbers in the figure:

[0034] 100, end cap welding device in the embodiment; 200, rack; 10, dialyzer housing; 11, dialyzer end cap; 20, main substrate; 30, end cap driving mechanism; 32, linear module; 33, material taking cylinder; 34, finger cylinder; 35, claw; 40, feeding mechanism; 41, translation cylinder; 42, carrier plate; 43, positioning boss; 44, limit plate; 50, housing positioning mechanism; 51, first bottom plate; 52, support block; 54. First double-head cylinder; 55. Driving arm; 56. Clamping block; 57. Positioning ramp; 60. Pre-positioning mechanism; 61. Cushion block; 62. Support platform; 63. Clamping body; 64. Elastic band; 65. Inverted ramp; 70. Heating mechanism; 71. Second bottom plate; 72. Second double-head cylinder; 73. Driving block; 74. Insulating block; 75. Ironing board; 76. Heating block; 77. Smoke hood; 80. Pull-down mechanism; 81. Lifting cylinder; 82. Gripping cylinder; 83. Clamping unit. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] Example, see Figures 1 to 11As shown, a dialyzer end cap welding device includes an end cap driving mechanism 30 , a shell positioning mechanism 50 and a heating mechanism 70 , all of which are installed on a main substrate 20 .

[0037] The end cap driving mechanism 30 includes a gripper 35 and a first driving assembly for driving the gripper 35 to move, wherein the gripper 35 is used to grab the dialyzer end cap 11 to be welded; the first driving assembly includes a linear module 32, a material taking cylinder 33 and a finger cylinder 34, wherein the linear module 32 is fixed on the main substrate 20, the material taking cylinder 33 is mounted on the linear module 32, the finger cylinder 34 is mounted on the material taking cylinder 33, and the gripper 35 is mounted on the finger cylinder 34. The linear module 32 is vertically arranged and drives the material taking cylinder 33 to move vertically, the material taking cylinder 33 drives the finger cylinder 34 to move vertically, and the finger cylinder 34 drives the gripper 35 to open and close horizontally to grab or put down the dialyzer end cap 11. The utility model uses a servo motor to cooperate with the linear module 32 driven by the module, and is controlled by the servo motor, which is convenient for precision adjustment and personnel operation, so that the movement precision of the end cap during the welding process is better controlled.

[0038] The claw 35 includes two semi-cylindrical claw monomers, and corresponding clearance gaps are set according to the positions of the liquid inlet and outlet on the dialyzer housing 10, so that the claw 35 can grab the dialyzer end cover 11 according to the preset position and direction. The two claw monomers are respectively installed on the two driving components of the finger cylinder 34, and the finger cylinder 34 drives the two claw monomers to move synchronously towards each other to grab the dialyzer end cover 11.

[0039] In a specific embodiment of the present invention, it also includes a feeding mechanism 40 installed on the main substrate 20, and the feeding mechanism 40 is used to move the dialyzer end cover 11 to the material picking position of the end cover driving mechanism 30 to eliminate the influence of manual end cover on product welding. The feeding mechanism 40 includes a translation cylinder 41 and a carrier plate 42 installed on the translation cylinder 41, and the carrier plate 42 is provided with a positioning boss 43 for positioning the dialyzer end cover 11 and a limit plate 44 with a groove. That is, the dialyzer end cover 11 is buckled upside down on the positioning boss 43, and the interface on the end cover just extends into and is limited in the groove of the limiting plate 44. At this time, the end cover is positioned on the carrier plate 42 according to the set position and direction, and then the translation cylinder 41 drives the carrier plate 42 to move, so that the end cover on the carrier plate 42 is located directly below the claw 35, and then the finger cylinder 34 drives the claw 35 to open, and the material taking cylinder 33 drives the opened claw 35 to move downward and grab the end cover on the carrier plate 42 through the claw 35, and the material taking cylinder 33 is reset, and the linear module 32 drives the end cover grabbed by the claw 35 to move downward to the set position.

[0040] The shell positioning mechanism 50 includes a support block 52 installed on the main substrate 20 and a clamping block 56 installed on the second driving assembly, and the second driving assembly drives the clamping block 56 to position the dialyzer shell 10 to be welded on the support block 52; the second driving assembly includes a first double-head cylinder 54 installed on the main substrate 20, and a driving arm 55 symmetrically installed on the two driving parts of the first double-head cylinder 54, the cylinder body of the first double-head cylinder 54 is horizontally fixed on the main substrate 20 through the first base plate 51, and the driving arm 55 is horizontally slidably installed on the guide rail fixed to the first base plate 51, the first double-head cylinder 54 drives the two driving arms 55 to slide horizontally reciprocatingly along the guide rail, and both of the driving arms 55 are installed with The clamping blocks 56, the two clamping blocks 56 are both in the shape of a quarter cylinder, and the supporting blocks 52 are both in the shape of a semi-cylinder. The two clamping blocks 56 and the supporting blocks 52 are coaxial to form a cylindrical shape that matches the main cylinder of the dialyzer housing 10. That is to say, after the first double-head cylinder 54 drives the two clamping blocks 56 to close through the driving arm 55, the two clamping blocks 56 and the supporting blocks 52 just form a complete cylindrical body, and the inner diameter of the cylindrical body is slightly smaller than the outer diameter of the main body of the dialyzer housing 10, that is, after the dialyzer housing 10 is held, there is a gap between it and the cylinder formed by the clamping blocks 56 and the supporting blocks 52, which is convenient for the pull-down mechanism 80 to pull the dialyzer housing 10 downward, and the inner side of the upper end of the cylindrical body is provided with a positioning inclined surface 57 for positioning the dialyzer housing 10.

[0041] In a specific embodiment of the utility model, it also includes a pull-down mechanism 80, which includes a lifting cylinder 81 installed on the main base plate 20 and a clamping cylinder 82 installed on the lifting cylinder 81, and clamping units 83 are installed on the two driving components of the clamping cylinder 82; the lifting cylinder 81 drives the clamping cylinder 82 to move vertically, and the clamping cylinder 82 drives the clamping unit 83 to open and close horizontally; after the two clamping blocks 56 are closed and combined with the support block 52 to hold the dialyzer shell 10 to be welded, the dialyzer shell 10 is pulled downward by the pull-down mechanism 80, so that the boss where the welding end of the dialyzer shell 10 is located is just supported on the positioning inclined surface 57 formed after the clamping block 56 and the support block 52 are closed, and under the pulling force of the pull-down mechanism 80 and the support of the positioning inclined surface 57, the dialyzer shell 10 can be clamped and positioned, and the positioning accuracy is high and the stability is good.

[0042] In a specific embodiment of the utility model, a pre-positioning mechanism 60 is also included, which includes a cushion block 61 fixed on the cylinder body of the first double-outlet cylinder 54 and a clamp body 63 symmetrically hinged on the cushion block 61, the cushion block 61 is provided with a support platform 62 with a circular arc surface, the inner side of the clamp body 63 is provided with a circular arc surface matching the main cylinder body of the dialyzer housing 10, an elastic band 64 is stretched between the roots of the two clamp bodies 63, and the roots of the clamp bodies 63 are provided with a limiting groove for positioning the elastic band 64, and the elastic force of the elastic band 64 drives the two clamp bodies 63 to swing toward each other to clamp the dialyzer housing 10, and the clamp bodies 63 are in the state of being locked. The top is also provided with an inverted slope 65 for facilitating the dialyzer housing 10 to slide between the two clamps 63. When the clamps 63 are in a natural state, the elastic band 64 is in a taut or critically taut state. When in use, the dialyzer housing 10 to be welded is manually slid between the two clamps 63 through the inverted slope 65 between the clamps 63 by external force. Then, the two clamps 63 clamp the dialyzer housing 10 under the action of the elastic band 64, and then cooperate with the support of the support platform 62 to support the dialyzer housing 10, so that the dialyzer housing 10 is in a relatively vertical initial positioning state, waiting for the housing positioning mechanism 50 and the pull-down mechanism 80 to clamp it in position.

[0043] The heating mechanism 70 is arranged between the end cover driving mechanism 30 and the shell positioning mechanism 50, and the heating mechanism 70 includes two ironing plates 75 and a third driving assembly that drives the two ironing plates 75 to move synchronously toward or in the opposite direction. The ironing plate 75 is provided with a notch that matches the end to be welded of the dialyzer shell 10, and the notch is semicircular. The third driving assembly includes a second double-head cylinder 72 installed on the main base plate 20, and a driving block 73 symmetrically installed on the two driving components of the second double-head cylinder 72. The cylinder body of the second double-head cylinder 72 is horizontally fixed to the main base plate 20 through a second bottom plate 71, and the driving block 73 is horizontally slidably installed on a guide rail fixed to the second bottom plate 71. The second double-head cylinder 72 drives the two driving blocks 73 to move horizontally along the guide rail. The drive block 73 slides repeatedly, and a heat insulating block 74 is installed on the heat insulating block 74, and the ironing plate 75 is installed on the heat insulating block 74. A gap is provided between the ironing plate 75 and the heat insulating block 74, and a heating block 76 is installed on the ironing plate 75, and the ironing plate 75 is heated by the heating block 76. The heating block 76 is usually an electric heating block 76, and a cooling channel is provided inside the heat insulating block 74. The two ports of the cooling channel are connected to the water circulation system, so the heat insulating block 74 can be cooled by circulating water cooling, which effectively blocks heat conduction and prevents the problem of excessive temperature of the equipment after long-term work, and the heat insulating block 74 has a protective function to avoid burns to personnel. The drive block 73 is also equipped with a smoke hood 77, and the smoke hood 77 usually includes two arranged on the left and right, which can effectively and timely discharge the smoke generated during the welding process.

[0044] When the utility model is in use:

[0045] First, the dialyzer end cover 11 to be welded is buckled on the positioning boss 43 of the feeding mechanism 40, and the interface on the end cover is just extended into and limited in the groove of the limiting plate 44. At this time, the end cover is positioned on the carrier plate 42 according to the set position and direction, and then the translation cylinder 41 drives the carrier plate 42 to move, so that the end cover on the carrier plate 42 is located directly below the claw 35, and then the finger cylinder 34 drives the claw 35 to open, and the material taking cylinder 33 drives the opened claw 35 to move downward and grab the end cover on the carrier plate 42 through the claw 35, the material taking cylinder 33 and the translation cylinder 41 are reset, and the linear module 32 drives the end cover grabbed by the claw 35 to move downward to the set position.

[0046] At the same time, after the dialyzer shell 10 to be welded is slid between the two clamps 63 through the inverted slope 65 between the clamps 63 by external force, the two clamps 63 clamp the dialyzer shell 10 under the action of the elastic band 64, and then cooperate with the support of the support platform 62 to support the dialyzer shell 10, so that the dialyzer shell 10 is in a relatively vertical initial positioning state. At this time, the human hand can be taken away and moved away, and then the shell positioning mechanism 50 and the pull-down mechanism 80 work again to ensure the safety of personnel.

[0047] Next, under the action of the first double-head cylinder 54, the two clamping blocks 56 are closed and combined with the support block 52 to hold the dialyzer shell 10 pre-positioned on the above-mentioned clamp body 63, and then the pull-down mechanism 80 works, that is, the clamping claw cylinder 82 clamps the lower end of the dialyzer shell 10 through the clamping monomer 83, and the lifting cylinder 81 drives the clamping monomer 83 to move downward, thereby pulling the dialyzer shell 10 to move downward, so that the boss at the upper end of the dialyzer shell 10 to be welded is supported on the positioning inclined surface 57 formed after the clamping block 56 and the support block 52 are closed.

[0048] Finally, the second double-head cylinder 72 drives the two ironing plates 75 to close. After the two ironing plates 75 are closed, the upper end of the dialyzer shell 10 just passes through the circular hole formed after the two ironing plates 75 are closed. The end face to be welded of the dialyzer shell 10 is located below the ironing plate 75 and the two are not in contact. The end face to be welded of the end cover grasped by the claw 35 is located above the ironing plate 75 and the two are not in contact, leaving enough space for the ironing plate 75 to close. Then the lifting cylinder 81 drives the clamping monomer 83 to move upward, thereby pulling the dialyzer shell 10 to move upward, so that the end face to be welded on the upper part of the dialyzer shell 10 contacts the ironing plate 75. The linear module 32 drives the end cover grasped by the claw 35 to move downward, so that the end face to be welded of the end cover contacts the ironing plate 75. Fig.10As shown, at this time, the two end faces to be welded are heated by the ironing plate 75 which has been heated to the set temperature. After heating to the set time, the ironing plate 75 is opened and reset, and the lifting cylinder 81 drives the clamping unit 83 to move downward, thereby pulling the dialyzer shell 10 downward, so that the boss of the upper end to be welded of the dialyzer shell 10 is just supported on the positioning inclined surface 57 formed after the clamping block 56 and the support block 52 are closed. Under the pulling force of the lifting cylinder 81 and the supporting action of the positioning inclined surface 57, the dialyzer shell 10 can be clamped and positioned to ensure the positioning accuracy and positioning stability, which is convenient for the next step of welding. Then, the linear module 32 drives the end cover grasped by the claw 35 to move downward to the set distance, so that the two molten end faces on the dialyzer shell 10 and the end cover collide and are welded together.

[0049] like Fig.11 As shown, based on the above-mentioned dialyzer end cover welding device, the utility model also provides:

[0050] A dialyzer end cap welding device, the welding device comprising the above-mentioned dialyzer end cap welding device 100, the number of the welding devices 100 is multiple, and all are installed on a frame 200. The above-mentioned welding device has the same advantages as the welding device provided in the embodiment of the utility model over the prior art, which will not be repeated here.

[0051] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A dialyzer end cover welding device, characterized in that: Includes: all mounted on the main baseboard: An end cap driving mechanism, the end cap driving mechanism comprising a claw and a first driving assembly for driving the claw to move, the claw being used to grab the dialyzer end cap to be welded; A housing positioning mechanism, the housing positioning mechanism comprising a support block mounted on the main base plate and a clamping block mounted on the second drive assembly, the second drive assembly driving the clamping block to position the dialyzer housing to be welded on the support block; A heating mechanism, the heating mechanism is arranged between the end cover driving mechanism and the shell positioning mechanism, the heating mechanism comprises two ironing plates and a third driving assembly driving the two ironing plates to move synchronously towards or in opposite directions, the ironing plates are provided with notches matching the ends to be welded of the dialyzer shell; After the dialyzer shell is positioned on the shell positioning mechanism, the third driving assembly drives the two ironing plates to move synchronously toward each other and heat the welding end of the dialyzer shell. After the heating is completed, the first driving assembly drives the dialyzer end cover grasped by the claw to move, so that the dialyzer end cover and the dialyzer shell's corresponding ends collide with each other, and the two are welded together through the heated and melted body.

2. A dialyzer end cover welding device as claimed in claim 1, characterized in that: The first driving assembly includes a linear module, a material picking cylinder and a finger cylinder. The linear module is fixed on the main base plate, the material picking cylinder is installed on the linear module, the finger cylinder is installed on the material picking cylinder, and the claw is installed on the finger cylinder.

3. A dialyzer end cover welding device as claimed in claim 2, characterized in that: The gripper comprises two semi-cylindrical gripper monomers, which are respectively mounted on two driving components of the finger cylinder. The finger cylinder drives the two gripper monomers to move synchronously toward each other to grab the dialyzer end cover.

4. A dialyzer end cover welding device as claimed in claim 1, characterized in that: It also includes a feeding mechanism installed on the main substrate, which is used to move the dialyzer end cover to the material picking position of the end cover driving mechanism. The feeding mechanism includes a translation cylinder and a carrier plate installed on the translation cylinder, and the carrier plate is provided with a positioning boss for positioning the dialyzer end cover and a limit plate with a groove.

5. A dialyzer end cover welding device as claimed in claim 1, characterized in that: The second driving assembly includes a first double-outlet cylinder installed on the main base plate, and driving arms symmetrically installed on the two driving parts of the first double-outlet cylinder. The clamping blocks are installed on both driving arms. The two clamping blocks are both quarter-cylindrical in shape, and the supporting blocks are both semi-cylindrical in shape. The two clamping blocks and the supporting blocks are coaxial to form a cylindrical shape that matches the main cylinder of the dialyzer shell.

6. A dialyzer end cover welding device as claimed in claim 5, characterized in that: It also includes a pre-positioning mechanism, which includes a pad fixed on the cylinder body of the first double-outlet cylinder and a clamp symmetrically hinged on the pad, the pad is provided with a support platform with a circular arc surface, the inner side of the clamp is provided with a circular arc surface matching the main cylinder body of the dialyzer shell, an elastic band is stretched between the roots of the two clamps, and the elastic force of the elastic band drives the two clamps to swing toward each other to clamp the dialyzer shell, and a reverse slope is also provided on the top of the clamp to facilitate the dialyzer shell to slide between the two clamps.

7. A dialyzer end cover welding device as claimed in claim 1, characterized in that: The third driving assembly includes a second double-head cylinder installed on the main base plate, a driving block symmetrically installed on the two driving components of the second double-head cylinder, an insulating block installed on the driving block, the ironing plate installed on the insulating block, a gap is provided between the ironing plate and the insulating block, and a heating block is installed on the ironing plate.

8. A dialyzer end cover welding device as claimed in claim 7, characterized in that: A cooling channel is provided inside the heat insulation block, and two ports of the cooling channel are connected to a water circulation system. A smoke hood is also installed on the driving block.

9. A dialyzer end cover welding device as claimed in claim 1, characterized in that: It also includes a pull-down mechanism, which includes a lifting cylinder installed on the main base plate and a clamping claw cylinder installed on the lifting cylinder, and clamping monomers are installed on both driving components of the clamping claw cylinder.

10. A dialyzer end cover welding device, characterized in that: The welding equipment comprises the dialyzer end cover welding device according to any one of claims 1 to 9.

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