Auxiliary tool for welding heat exchanger tube plate

Abstract

The invention discloses a heat exchanger tube plate welding auxiliary tool which comprises a base, a first mounting disc and a second mounting disc are arranged at the two ends of the base respectively, and first through holes and second through holes matched with heat exchange tube bodies are formed in the surfaces of the first mounting disc and the second mounting disc in an annular array mode; by arranging expansion wheel assemblies, a first gear, a second gear, a rack and an arc-shaped clamping plate, in the process that a heat exchange pipe body is inserted into a first through hole, the two sides of the heat exchange pipe body make contact with the two expansion wheel assemblies at the corresponding positions and generate friction, so that the expansion wheel assemblies rotate, and under the action of the first gear and the second gear, the rack moves leftwards, so that the heat exchange pipe body is inserted into the arc-shaped clamping plate. And the two arc-shaped clamping plates are arranged, so that the two arc-shaped clamping plates get close to each other to clamp the side wall of the heat exchange pipe body, the heat exchange pipe body is prevented from continuously moving, the left end of the heat exchange pipe body moves to a designated position, the ends of the multiple heat exchange pipe bodies can be located on the same plane, and the adjusting difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the field of heat exchanger tube sheet welding equipment, in particular to an auxiliary tooling for heat exchanger tube sheet welding. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. It is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used. During the production process of heat exchangers, it is necessary to weld the heat exchange tubes and tube sheets.

[0003] For example, the invention patent with publication number CN214721925U discloses a heat exchanger heat exchange tube and tube sheet welding device, including a base plate, a heat exchange tube and a tube sheet, wherein the lower surface of the base plate is fixedly connected with a first electric push rod and a support leg, the upper surface of the base plate is plugged with a movable shaft, the upper and lower surfaces of the movable shaft are fixedly connected with a movable plate, and the output end of the first electric push rod is fixedly connected with the upper surface of the movable plate located at the bottom.

[0004] In the above scheme, during the process of welding the tube sheet, the heat exchange tubes need to be inserted into the tube sheet one by one, which makes it difficult to align the ends of several heat exchange tubes and keep them flat, and manual adjustment is required. In addition, the heat exchange tubes lack limiters during the welding process, which makes it easy for the heat exchange tubes to shift during the welding process, thereby increasing the difficulty of adjustment.

[0005] To this end, the present invention proposes an auxiliary tooling for welding a heat exchanger tube sheet to solve the above-mentioned problem. Summary of the invention

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: an auxiliary tooling for welding a heat exchanger tube sheet, comprising:

[0007] A base, wherein a first mounting plate and a second mounting plate are respectively disposed at both ends of the base, and the surfaces of the first mounting plate and the second mounting plate are provided with first through holes and second through holes adapted to the heat exchange tube body in an annular array;

[0008] Two rotating seats, the two rotating seats are symmetrically distributed on both sides of the first through hole, and the rotating seats are fixedly connected to the left side wall of the first mounting plate;

[0009] An expansion wheel assembly, the expansion wheel assembly is rotatably connected to the end of the rotating seat, and the expansion wheel assembly can shrink and expand;

[0010] A first gear, the first gear being coaxially fixed to the expansion wheel assembly;

[0011] a second gear, the second gear being rotatably connected to the rotating base, and the second gear being meshed with the first gear;

[0012] A rack, the rack slides through the first mounting plate, the rack is meshed with the second gear, and an elastic connector is connected between the rack and the first mounting plate;

[0013] Two arc-shaped clamping plates, the two arc-shaped clamping plates are slidably connected to the right side wall of the first mounting plate;

[0014] A driving plate, the driving plate is fixedly connected to the side wall of the arc-shaped clamping plate, a driving groove is opened on the surface of the driving plate, the driving groove has a straight groove and an oblique groove, a connecting pin is fixedly connected to the end of the rack, and the connecting pin is slidably connected in the driving groove;

[0015] A positioning assembly, the positioning assembly is used to limit the rack so that the rack is positioned at a specified position;

[0016] Specifically, in the prior art, during the process of welding the tube sheets, the heat exchange tubes need to be inserted into the tube sheets one by one, which makes it difficult to align the ends of several heat exchange tubes and keep them flat, and manual adjustment is required. In addition, during the welding process, the heat exchange tubes lack position limits, which makes it easy for the heat exchange tubes to shift during the welding process, thereby increasing the difficulty of adjustment. The present technical solution can solve the above problems. The specific operation is as follows: first, the heat exchange tube body is inserted from any second through hole in the second mounting plate until the heat exchange tube body is inserted out of the first through hole at the corresponding position in the first mounting plate. During the process of inserting the heat exchange tube body into the first through hole, both sides of the heat exchange tube body contact and generate friction with the two expansion wheel assemblies at the corresponding positions, so that the expansion wheel assembly rotates. The first gear rotates, and under the action of meshing, the second gear rotates, and the second gear drives the rack, so that the rack moves to the left. In the process of the rack moving to the left, the connecting pin moves along the driving groove. The connecting pin first moves along the straight groove. At this time, the two arc clamping plates stay in place and are not close to the clamping heat exchange tube body, so that the end of the heat exchange tube body passes through the first through hole to the left and moves away from the first mounting plate. Then the connecting pin moves along the inclined groove. Driven by the inclined groove, the two arc clamping plates are close to each other to clamp the side wall of the heat exchange tube body to prevent the heat exchange tube body from continuing to move, so that the left end of the heat exchange tube body moves to the specified position, which is beneficial for the ends of several heat exchange tube bodies to be located on the same plane, reducing the difficulty of adjustment;

[0017] Furthermore, by setting a positioning component, after the arc clamping plate clamps the heat exchange tube body, the rack is positioned by the positioning component, so that the arc clamping plate is limited and the heat exchange tube body can be stably clamped, which is conducive to reducing the phenomenon of the heat exchange tube body being offset during the welding process, improving the welding stability and reducing the difficulty of adjustment;

[0018] After welding is completed, the expansion wheel assembly is first contracted to move the expansion wheel assembly away from the side wall of the heat exchange tube body, and then the positioning effect of the positioning assembly on the rack is canceled. Under the action of the elastic connecting piece, the rack is reset. During the reset movement of the rack, the two arc-shaped clamping plates are reset by driving the inclined groove to cancel the clamping limit of the heat exchange tube body, thereby facilitating the heat exchange tube body to be pulled out from the first through hole and the second through hole.

[0019] Preferably, the expansion wheel assembly comprises:

[0020] An annular shell, wherein the bottom end of the annular shell is rotatably connected to a connecting cover;

[0021] A damping capsule, wherein the damping capsule is fixedly connected to the outer side wall of the annular shell and the damping capsule is communicated with the interior of the annular shell;

[0022] A pumping mechanism is used to inject gas into the annular shell to expand the damping capsule.

[0023] Preferably, the pumping mechanism comprises:

[0024] a cavity, the cavity being opened in the first mounting plate;

[0025] a first air pipe, one end of which is fixedly connected to the connection cover, and the other end of which is fixedly connected to the first mounting plate;

[0026] A second air pipe, wherein one end of the second air pipe is fixedly connected to the first mounting plate, and the other end of the second air pipe is connected to an external air pump.

[0027] Preferably, the outer side wall of the first mounting plate is rotatably connected with an annular connecting plate, the second air pipe is fixedly connected to the annular connecting plate, the annular connecting plate is fixedly connected to the base, the second mounting plate is rotatably connected to the base, and the right side wall of the first mounting plate is fixedly connected with a plurality of connecting rods in an annular array, and the other end of the connecting rod is fixedly connected to the side wall of the second mounting plate;

[0028] The outer side wall of the second mounting plate is fixedly connected with a plurality of teeth in an annular array;

[0029] The first motor has a base disposed outside thereof, and the end of the output shaft of the first motor is fixedly connected to a third gear, and the third gear is meshed with the teeth.

[0030] Preferably, the positioning component comprises:

[0031] A shell, the shell is fixedly connected to the right side wall of the first mounting plate at a position corresponding to the rack, and the shell is communicated with the air cavity;

[0032] A sleeve, the sleeve is fixedly connected to the outer wall of the shell, and a piston rod is slidably connected in the sleeve;

[0033] A clamping block, wherein the clamping block is slidably connected to the end of the piston rod, and a second spring is connected between the clamping block and the piston rod;

[0034] A clamping groove is provided on the side wall of the rack.

[0035] Preferably, the positioning component further comprises:

[0036] A pulley is rotatably connected to the end of the clamping block, and the pulley contacts the side wall of the rack at a corresponding position.

[0037] Preferably, the radius of the first gear is smaller than the radius of the second gear.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The present invention provides an expansion wheel assembly, a first gear, a second gear, a rack and an arc-shaped clamping plate. When the heat exchange tube body is inserted into the first through hole, the two sides of the heat exchange tube body contact and generate friction with the two expansion wheel assemblies at the corresponding positions, so that the expansion wheel assembly rotates. Under the action of the first gear and the second gear, the rack moves to the left, so that the two arc-shaped clamping plates are close to each other to clamp the side wall of the heat exchange tube body to prevent the heat exchange tube body from continuing to move, so that the left end of the heat exchange tube body moves to the specified position, which is conducive to the ends of several heat exchange tube bodies being located on the same plane and reducing the difficulty of adjustment.

[0040] 2. The present invention sets a positioning component. After the arc-shaped clamping plate clamps the heat exchange tube body, the rack is positioned by the positioning component, so that the arc-shaped clamping plate is limited and the heat exchange tube body can be stably clamped, which is beneficial to reduce the phenomenon of displacement of the heat exchange tube body during welding, improve welding stability, and reduce the difficulty of adjustment.

[0041] 3. The present invention sets a first motor and a third gear. During the process of inserting the heat exchange tube body, the first motor can be started to rotate the third gear, thereby driving the second mounting plate and the first mounting plate to rotate, thereby moving the position for inserting the heat exchange tube body to a designated position. On the one hand, it is convenient for inserting the heat exchange tube body, and on the other hand, it is convenient to adjust the unwelded position to the designated position for welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0043] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0044] Figure 3 It is a schematic diagram of the connection between the first mounting plate and the annular connecting plate in the present invention;

[0045] Figure 4 It is a schematic diagram of the connection between the first mounting plate and the arc-shaped clamping plate in the present invention;

[0046] Figure 5 It is a schematic diagram of the connection between the arc-shaped clamping plate and the rack in the present invention;

[0047] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0048] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0049] Figure 8 for Figure 5 Enlarged view of point C in the middle;

[0050] Fig. 9 It is a schematic diagram of the connection between the rotating seat and the expansion wheel assembly in the present invention;

[0051] Fig.10 It is a connection diagram of the housing and the clamping block in the present invention.

[0052] In the figure: heat exchange tube body 1, tube sheet 2, base 3, first mounting plate 4, second mounting plate 5, first through hole 6, second through hole 7, rotating seat 8, first gear 9, second gear 10, rack 11, first spring 12, arc clamping plate 13, drive plate 14, drive groove 15, straight groove 1501, inclined groove 1502, connecting pin 16, annular shell 17, connecting cover 18, damping capsule 19, cavity 20, first air pipe 21, second air pipe 22, annular connecting plate 23, connecting rod 24, teeth 25, first motor 26, third gear 27, shell 28, sleeve 29, piston rod 30, clamping block 31, pulley 32, second spring 33, clamping groove 34, base 35, hydraulic cylinder 36, top seat 37, arc limit plate 38, guide rail 39, second motor 40, screw rod 41, sliding rod 42. DETAILED DESCRIPTION

[0053] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0054] like Figures 1 to 10 An auxiliary tooling for welding a heat exchanger tube sheet is shown, comprising:

[0055] A base 3, with a first mounting plate 4 and a second mounting plate 5 respectively disposed at both ends of the base 3, and a first through hole 6 and a second through hole 7 adapted to the heat exchange tube body 1 are formed in an annular array on the surface of the first mounting plate 4 and the second mounting plate 5;

[0056] Two rotating seats 8, the two rotating seats 8 are symmetrically distributed on both sides of the first through hole 6, and the rotating seats 8 are fixedly connected to the left side wall of the first mounting plate 4;

[0057] An expansion wheel assembly, which is rotatably connected to the end of the rotating seat 8, and can be contracted and expanded;

[0058] A first gear 9, the first gear 9 is coaxially fixed with the expansion wheel assembly;

[0059] A second gear 10, the second gear 10 is rotatably connected to the rotating base 8, and the second gear 10 is meshed with the first gear 9;

[0060] The rack 11 slides through the first mounting plate 4, the rack 11 is meshed with the second gear 10, and an elastic connector is connected between the rack 11 and the first mounting plate 4;

[0061] Two arc-shaped clamping plates 13, the two arc-shaped clamping plates 13 are slidably connected to the right side wall of the first mounting plate 4;

[0062] The driving plate 14 is fixedly connected to the side wall of the arc-shaped clamping plate 13. A driving groove 15 is provided on the surface of the driving plate 14. The driving groove 15 has a straight groove 1501 and an oblique groove 1502. A connecting pin 16 is fixedly connected to the end of the rack 11. The connecting pin 16 is slidably connected in the driving groove 15.

[0063] A positioning component, which is used to limit the rack 11 so that the rack 11 is positioned at a specified position;

[0064] Specifically, in the prior art, during the process of welding the tube sheet 2, the heat exchange tubes need to be inserted into the tube sheet 2 one by one, which makes it difficult to align the ends of several heat exchange tubes and keep them flat, and manual adjustment is required. In addition, the heat exchange tubes lack limit stops during the welding process, which makes the heat exchange tubes easily offset during the welding process, thereby increasing the difficulty of adjustment. The present technical solution can solve the above problems. The specific operation is as follows: first, the heat exchange tube body 1 is inserted from any second through hole 7 in the second mounting plate 5 until the heat exchange tube body 1 is inserted out of the first through hole 6 at the corresponding position in the first mounting plate 4. During the process of inserting the heat exchange tube body 1 into the first through hole 6, both sides of the heat exchange tube body 1 contact and generate friction with the two expansion wheel assemblies at the corresponding positions, so that the expansion wheel assembly rotates, and the first gear 9 rotates. Under the action of meshing, the heat exchange tube body 1 is inserted into the first through hole 6. , so that the second gear 10 rotates, and the second gear 10 drives the rack 11, so that the rack 11 moves to the left. In the process of the rack 11 moving to the left, the connecting pin 16 moves along the driving groove 15. The connecting pin 16 first moves along the straight groove 1501. At this time, the two arc clamping plates 13 stay in place and are not close to the clamping heat exchange tube body 1, so that the end of the heat exchange tube body 1 passes through the first through hole 6 to the left and is away from the first mounting plate 4. Then the connecting pin 16 moves along the inclined groove 1502. Driven by the inclined groove 1502, the two arc clamping plates 13 are close to each other to clamp the side wall of the heat exchange tube body 1 to prevent the heat exchange tube body 1 from continuing to move, so that the left end of the heat exchange tube body 1 moves to the specified position, which is conducive to the ends of several heat exchange tube bodies 1 being located on the same plane, reducing the difficulty of adjustment;

[0065] Furthermore, by setting a positioning component, after the arc clamping plate 13 clamps the heat exchange tube body 1, the rack 11 is positioned by the positioning component, so that the arc clamping plate 13 is limited and the heat exchange tube body 1 can be stably clamped, which is beneficial to reduce the phenomenon of the heat exchange tube body 1 being offset during the welding process, improves the welding stability, and reduces the difficulty of adjustment;

[0066] After welding is completed, the expansion wheel assembly is first contracted to move the expansion wheel assembly away from the side wall of the heat exchange tube body 1, and then the positioning effect of the positioning assembly on the rack 11 is canceled. Under the action of the elastic connecting member, the rack 11 is reset. During the reset movement of the rack 11, the two arc-shaped clamping plates 13 are reset by driving the inclined groove 1502 to cancel the clamping limit of the heat exchange tube body 1, thereby facilitating the heat exchange tube body 1 to be pulled out from the first through hole 6 and the second through hole 7.

[0067] The elastic connecting member includes a first spring 12 , and two ends of the first spring 12 are fixedly connected to the rack 11 and the side wall of the first mounting plate 4 , respectively.

[0068] It should be noted that: the radius of the first gear 9 is smaller than the radius of the second gear 10, and the radius of the annular shell 17 is not smaller than the radius of the second gear 10. For example, the radii of the annular shell 17 and the second gear 10 are the same, and the second gear 10 is twice as large as the first gear 9. The annular shell 17 rotates 2 circles, the first gear 9 rotates 2 circles, and the second gear 10 rotates 1 circle. At this time, twice the circumference of the annular shell 17 is the distance moved by the heat exchange tube body 1, and the rack 11 only moves one-half of the distance moved by the heat exchange tube body 1. If the second gear 10 is the same as the first gear 9, the moving distance of the rack 11 will increase by 2 times, thereby slowing down the moving speed of the rack 11, and then the two arc-shaped clamping plates 13 slowly approach and clamp the heat exchange tube body 1, so that the heat exchange tube body 1 has sufficient time to move, thereby ensuring that the left end of the heat exchange tube body 1 can move to a farther distance.

[0069] As a further embodiment of the present invention, the expansion wheel assembly comprises:

[0070] An annular shell 17, the bottom end of which is rotatably connected to a connecting cover 18;

[0071] A damping capsule 19, which is fixedly connected to the outer wall of the annular shell 17, and the damping capsule 19 is communicated with the interior of the annular shell 17;

[0072] A pumping mechanism, the pumping mechanism is used to inject gas into the annular shell 17 to expand the damping capsule 19;

[0073] Specifically, by providing the damping capsule 19, the friction with the heat exchange tube is increased. Before inserting the heat exchange tube body 1, gas is first injected into the damping capsule 19 through the pumping mechanism to expand the damping capsule 19, thereby making the damping capsule 19 contact with the side wall of the heat exchange tube body 1. When the heat exchange tube body 1 moves, it contacts the damping capsule 19 and generates friction, so that the annular shell 17 rotates, thereby making the first gear 9 rotate. After welding, the gas in the annular shell 17 is extracted through the pumping mechanism to make the damping capsule 19 contract and move the damping capsule 19 away from the side wall of the heat exchange tube body 1. Subsequently, the positioning effect of the positioning component on the rack 11 is canceled, and the rack 11 is reset under the action of the elastic connecting member. In the process of the rack 11 resetting and moving, the two arc-shaped clamping plates 13 are reset by driving the inclined groove 1502 to cancel the clamping limit on the heat exchange tube body 1, thereby facilitating the heat exchange tube body 1 to be pulled out from the first through hole 6 and the second through hole 7.

[0074] As a further embodiment of the present invention, the pumping mechanism comprises:

[0075] A cavity 20, the cavity 20 is opened in the first mounting plate 4;

[0076] A first air pipe 21, one end of the first air pipe 21 is fixedly connected to the connection cover 18, and the other end of the first air pipe 21 is fixedly connected to the first mounting plate 4;

[0077] A second air pipe 22, one end of which is fixedly connected to the first mounting plate 4, and the other end of which is connected to an external air pump;

[0078] Specifically, by setting the first air pipe 21 and the second air pipe 22, it is convenient for an external air pump to pump gas into the second air pipe 22. The gas passes through the cavity 20 and is transported to the first air pipe 21 at each position. Through the first air pipe 21, the damping capsule 19 at each position is expanded. After welding is completed, the damping capsule 19 at each position is contracted in the same way.

[0079] As a further embodiment of the present invention, the outer side wall of the first mounting plate 4 is rotatably connected with an annular connecting plate 23, the second air pipe 22 is fixedly connected to the annular connecting plate 23, the annular connecting plate 23 is fixedly connected to the base 3, the second mounting plate 5 is rotatably connected to the base 3, and the right side wall of the first mounting plate 4 is fixedly connected with a plurality of connecting rods 24 in an annular array, and the other end of the connecting rod 24 is fixedly connected to the side wall of the second mounting plate 5;

[0080] The outer wall of the second mounting plate 5 is fixedly connected to a plurality of teeth 25 in an annular array;

[0081] A first motor 26 , a base is disposed outside the first motor 26 , a third gear 27 is fixedly connected to the end of the output shaft of the first motor 26 , and the third gear 27 is meshed with the teeth 25 ;

[0082] Specifically, by setting the first motor 26 and the third gear 27, during the process of inserting the heat exchange tube body 1, the first motor 26 can be started to rotate the third gear 27, thereby driving the second mounting disk 5 and the first mounting disk 4 to rotate, thereby moving the position for inserting the heat exchange tube body 1 to the specified position. On the one hand, it is convenient for inserting the heat exchange tube body 1, and on the other hand, it is convenient to adjust the unwelded position to the specified position for welding.

[0083] As a further embodiment of the present invention, the positioning component comprises:

[0084] A housing 28, the housing 28 is fixedly connected to the right side wall of the first mounting plate 4 at a position corresponding to the rack 11, and the housing 28 is communicated with the cavity 20;

[0085] A sleeve 29, the sleeve 29 is fixedly connected to the outer wall of the housing 28, and a piston rod 30 is slidably connected in the sleeve 29;

[0086] A clamping block 31, the clamping block 31 is slidably connected to the end of the piston rod 30, and a second spring 33 is connected between the clamping block 31 and the piston rod 30;

[0087] A clamping groove 34, which is formed on a side wall of the rack 11;

[0088] Specifically, by providing the housing 28 and the clamping block 31, when the second air pipe 22 injects gas into the cavity 20, the piston rod 30 slides along the sleeve 29 under the action of the gas pressure, so that the second spring 33 is compressed to generate elastic force. When the rack 11 moves to the specified position, the clamping block 31 falls into the clamping groove 34 under the action of the second spring 33, so that the rack 11 is positioned, and then the arc clamping plate 13 is limited, so that the heat exchange tube body 1 can be stably clamped, which is conducive to reducing the phenomenon of the heat exchange tube body 1 being offset during welding and improving welding stability.

[0089] When the second exhaust pipe extracts gas from the air cavity, the piston rod 30 pulls the clamping block 31 so that the clamping block 31 is disengaged from the clamping groove 34 , and the rack 11 is reset under the action of the first spring 12 .

[0090] Furthermore, the positioning component also includes:

[0091] A pulley 32, which is rotatably connected to the end of the clamping block 31, and the pulley 32 contacts the side wall of the rack 11 at a corresponding position;

[0092] Specifically, the pulley 32 is provided to reduce the damping between the clamping block 31 and the side wall of the rack 11 , so as to facilitate the normal movement of the rack 11 .

[0093] As a further embodiment of the present invention, it also includes:

[0094] A base 35, a first semicircular groove is formed on the top of the base 35, the base 35 is located on the left side of the first mounting plate 4, and a hydraulic cylinder 36 is symmetrically fixedly connected to the side wall of the base 35;

[0095] A top seat 37, the top seat 37 is slidably connected to the top of the base 35, the bottom end of the top seat 37 is fixedly connected to the telescopic rod of the hydraulic cylinder 36, and a second semicircular groove is formed at the bottom end of the top seat 37;

[0096] An arc-shaped limiting plate 38, the arc-shaped limiting plate 38 is fixedly connected to the inner wall of the second semicircular groove;

[0097] A linear drive mechanism, which is used to drive the base 35 to move linearly, so that the base 35 drives the tube sheet 2 to be welded to move to the right;

[0098] The linear drive mechanism includes:

[0099] Two guide rails 39, the two guide rails 39 are symmetrically fixedly connected to two sides of the base 3;

[0100] A second motor 40, the second motor 40 is fixedly connected to the outer side wall of the guide rail 39;

[0101] A screw rod 41, both ends of which are rotatably connected to the guide rail 39, and one end of which is fixedly connected to the output shaft of the second motor 40;

[0102] The bottom end of the base 35 is threadedly connected to the surface of the screw rod 41, and the side wall of the bottom end of the base 35 is fixedly connected to a sliding rod 42, which passes through the inner wall of the base 3 and is slidably connected to the base 3;

[0103] Specifically, in the process of welding the tube sheet 2, the tube sheet 2 to be welded is first placed in the first semicircular groove, and then the hydraulic cylinder 36 is started, so that the telescopic rod of the hydraulic cylinder 36 moves downward, so that the top seat 37 moves downward, so that the inner wall of the second semicircular groove contacts the tube sheet 2, and the arc-shaped limiting plate 38 is set to limit the tube sheet 2, and then the second motor 40 is started to rotate the screw rod 41, and under the drive of the thread, the base 35 drives the tube sheet 2 to move rightward, so that the tube sheet 2 is connected with the plurality of heat exchange tube bodies 1;

[0104] After welding is completed, the second motor 40 is used to rotate the screw rod 41. Under the drive of the thread, the base 35 drives the welded tube sheet 2 and the heat exchange tube body 1 to move to the left. Then, the hydraulic cylinder 36 is used to move the top seat 37 upward to cancel the limit on the tube sheet 2. Finally, the welded tube sheet 2 is transported away by the external transport device.

[0105] Working principle of the present invention: in the process of welding the tube sheet 2, the heat exchange tubes need to be inserted into the tube sheet 2 one by one, which makes it difficult to align the ends of several heat exchange tubes and keep them flat, and manual adjustment is required. In addition, the heat exchange tubes lack limit during the welding process, which makes it easy for the heat exchange tubes to shift during the welding process, thereby increasing the difficulty of adjustment. The technical solution can solve the above problems. The specific operation is as follows: first, the heat exchange tube body 1 is inserted from any second through hole 7 in the second mounting plate 5 until the heat exchange tube body 1 is inserted out of the first through hole 6 at the corresponding position in the first mounting plate 4. In the process of inserting the heat exchange tube body 1 into the first through hole 6, the two sides of the heat exchange tube body 1 contact and generate friction with the two expansion wheel assemblies at the corresponding positions, so that the expansion wheel assembly rotates, and the first gear 9 rotates. Under the action of meshing, The second gear 10 rotates, and the second gear 10 drives the rack 11 to move leftward. In the process of the rack 11 moving leftward, the connecting pin 16 moves along the driving groove 15. The connecting pin 16 first moves along the straight groove 1501. At this time, the two arc clamping plates 13 stay in place and are not close to the clamping heat exchange tube body 1, so that the end of the heat exchange tube body 1 passes through the first through hole 6 to the left and is away from the first mounting plate 4. Then the connecting pin 16 moves along the inclined groove 1502. Driven by the inclined groove 1502, the two arc clamping plates 13 are close to each other to clamp the side wall of the heat exchange tube body 1 to prevent the heat exchange tube body 1 from continuing to move, so that the left end of the heat exchange tube body 1 moves to the specified position, which is conducive to making the ends of several heat exchange tube bodies 1 on the same plane and reducing the difficulty of adjustment.

[0106] Furthermore, by setting a positioning component, after the arc clamping plate 13 clamps the heat exchange tube body 1, the rack 11 is positioned by the positioning component, so that the arc clamping plate 13 is limited and the heat exchange tube body 1 can be stably clamped, which is beneficial to reduce the phenomenon of the heat exchange tube body 1 being offset during the welding process, improves the welding stability, and reduces the difficulty of adjustment;

[0107] After welding is completed, the expansion wheel assembly is first contracted to move the expansion wheel assembly away from the side wall of the heat exchange tube body 1, and then the positioning effect of the positioning assembly on the rack 11 is canceled. Under the action of the elastic connecting member, the rack 11 is reset. During the reset movement of the rack 11, the two arc-shaped clamping plates 13 are reset by driving the inclined groove 1502 to cancel the clamping limit of the heat exchange tube body 1, thereby facilitating the heat exchange tube body 1 to be pulled out from the first through hole 6 and the second through hole 7.

[0108] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An auxiliary tooling for welding a heat exchanger tube sheet, characterized in that: include: A base (3), wherein a first mounting plate (4) and a second mounting plate (5) are respectively arranged at both ends of the base (3), and the surfaces of the first mounting plate (4) and the second mounting plate (5) are both provided with a first through hole (6) and a second through hole (7) adapted to the heat exchange tube body (1) in an annular array; Two rotating seats (8), the two rotating seats (8) are symmetrically distributed on both sides of the first through hole (6), and the rotating seats (8) are fixedly connected to the left side wall of the first mounting plate (4); An expansion wheel assembly, the expansion wheel assembly is rotatably connected to the end of the rotating seat (8), and the expansion wheel assembly can be contracted and expanded; A first gear (9), the first gear (9) being coaxially fixed to the expansion wheel assembly; A second gear (10), the second gear (10) is rotatably connected to the rotating base (8), and the second gear (10) is meshed with the first gear (9); A rack (11), the rack (11) slidably passes through the first mounting plate (4), the rack (11) is meshed with the second gear (10), and an elastic connecting member is connected between the rack (11) and the first mounting plate (4); Two arc-shaped clamping plates (13), the two arc-shaped clamping plates (13) being slidably connected to the right side wall of the first mounting plate (4); A driving plate (14), the driving plate (14) is fixedly connected to the side wall of the arc-shaped clamping plate (13), a driving groove (15) is provided on the surface of the driving plate (14), the driving groove (15) has a straight groove (1501) and an oblique groove (1502), a connecting pin (16) is fixedly connected to the end of the rack (11), and the connecting pin (16) is slidably connected in the driving groove (15); A positioning component is used to limit the position of the rack (11) so that the rack (11) is positioned at a specified position.

2. The auxiliary tooling for heat exchanger tube sheet welding according to claim 1, characterized in that: The expansion wheel assembly comprises: An annular shell (17), wherein the bottom end of the annular shell (17) is rotatably connected to a connecting cover (18); A damping capsule (19), wherein the damping capsule (19) is fixedly connected to the outer wall of the annular shell (17), and the damping capsule (19) is communicated with the interior of the annular shell (17); A pumping mechanism is used to inject gas into the annular shell (17) to expand the damping capsule (19).

3. The auxiliary tooling for heat exchanger tube sheet welding according to claim 2, characterized in that: The pumping mechanism comprises: A cavity (20), wherein the cavity (20) is opened in the first mounting plate (4); A first air pipe (21), one end of the first air pipe (21) being fixedly connected to the connection cover (18), and the other end of the first air pipe (21) being fixedly connected to the first mounting plate (4); A second air pipe (22), one end of the second air pipe (22) is fixedly connected to the first mounting plate (4), and the other end is connected to an external air pump.

4. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 3, characterized in that: The outer side wall of the first mounting plate (4) is rotatably connected to an annular connecting plate (23), the second air pipe (22) is fixedly connected to the annular connecting plate (23), the annular connecting plate (23) is fixedly connected to the base (3), the second mounting plate (5) is rotatably connected to the base (3), a plurality of connecting rods (24) are fixedly connected in an annular array to the right side wall of the first mounting plate (4), the other end of the connecting rod (24) is fixedly connected to the side wall of the second mounting plate (5); A plurality of teeth (25) are fixedly connected in an annular array to the outer wall of the second mounting plate (5); A first motor (26), wherein a base is arranged outside the first motor (26), and a third gear (27) is fixedly connected to the end of the output shaft of the first motor (26), and the third gear (27) is meshed with the teeth (25).

5. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 3, characterized in that: The positioning component comprises: A shell (28), the shell (28) being fixedly connected to the right side wall of the first mounting plate (4) at a position corresponding to the rack (11), and the shell (28) being in communication with the air cavity; A sleeve (29), wherein the sleeve (29) is fixedly connected to the outer wall of the housing (28), and a piston rod (30) is slidably connected inside the sleeve (29); A clamping block (31), wherein the clamping block (31) is slidably connected to the end of the piston rod (30), and a second spring (33) is connected between the clamping block (31) and the piston rod (30); A clamping groove (34), wherein the clamping groove (34) is formed on a side wall of the rack (11).

6. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that: Also includes: A base (35), wherein a first semicircular groove is formed at the top of the base (35), the base (35) is located on the left side of the first mounting plate (4), and a hydraulic cylinder (36) is symmetrically fixedly connected to the side wall of the base (35); A top seat (37), wherein the top seat (37) is slidably connected to the top of the base (35), the bottom end of the top seat (37) is fixedly connected to the telescopic rod of the hydraulic cylinder (36), and a second semicircular groove is formed at the bottom end of the top seat (37); An arc-shaped limiting plate (38), wherein the arc-shaped limiting plate (38) is fixedly connected to the inner wall of the second semicircular groove; A linear drive mechanism is used to drive the base (35) to move linearly, so that the base (35) drives the tube sheet (2) to be welded to move rightward.

7. The auxiliary tooling for heat exchanger tube sheet welding according to claim 6, characterized in that: The linear drive mechanism comprises: Two guide rails (39), the two guide rails (39) are symmetrically fixedly connected to two sides of the base (3); A second motor (40), the second motor (40) being fixedly connected to an outer side wall of the guide rail (39); A screw rod (41), both ends of which are rotatably connected to the guide rail (39), and one end of which is fixedly connected to the output shaft of the second motor (40); The bottom end of the base (35) is threadedly connected to the surface of the screw rod (41), and the side wall of the bottom end of the base (35) is fixedly connected with a sliding rod (42). The sliding rod (42) penetrates the inner wall of the base (3) and is slidably connected to the base (3).

8. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that: The elastic connecting member comprises a first spring (12), the two ends of which are respectively fixedly connected to the rack (11) and the side wall of the first mounting plate (4).

9. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 5, characterized in that: The positioning component also includes: A pulley (32) is rotatably connected to the end of the clamping block (31), and the pulley (32) contacts the side wall of the rack (11) at a corresponding position.

10. The auxiliary tooling for heat exchanger tube sheet welding according to claim 1, characterized in that: The radius of the first gear (9) is smaller than the radius of the second gear (10).

Images