A clamping and positioning device for the welding of a centrifugal pump impeller

Abstract

The present invention relates to the technical field of welding equipment, and specifically to a clamping and positioning device for the welding of a centrifugal pump impeller, which includes a split base, a chassis and a pressure plate. The chassis is annularly provided with shallow inclined blade clamping grooves, and the pressure plate is assembled in matching with the chassis for the loading of the hub. It further includes: a blade clamping mechanism, which is used for fixing the blades. At the end of each blade clamping groove on the chassis, there is an installation seat, on which an arc-shaped inner clamping strip and an outer clamping strip are slidably installed. The inner clamping strip and the outer clamping strip are kept in a discrete state by a first spring, and a pinching component is arranged on the installation seat for controlling the aggregation of the inner clamping strip and the outer clamping strip; a magnetic drive mechanism, which is used for driving the inner clamping strip and the outer clamping strip to aggregate. A central cylinder is arranged in the middle of the chassis, on which a turntable with a push rod is rotatably installed. When the turntable rotates, it drives the pinching component, and when the pressure plate is assembled, it can drive the turntable to rotate through magnetic coupling; achieving the purpose of facilitating material taking after welding and preventing deformation.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, in particular to a clamping and positioning device for welding a centrifugal pump impeller. Background Art

[0002] The impeller of a centrifugal pump is the core component of the fluid delivery system, and its manufacturing accuracy directly affects the efficiency, vibration and service life of the pump. Traditional impellers are usually formed by casting or welding processes. Among them, welded impellers are widely used in high-pressure, corrosion-resistant and customized pump bodies due to their flexible design, high material utilization rate, and suitability for complex structures.

[0003] Impellers are mostly welded by thin-walled blades and hubs. In existing centrifugal pump impeller welding machines, split positioning clamping and positioning devices are more common. They use independent blade fixtures and hub fixtures. Usually, the blades are positioned and loaded through multiple grooves arranged in an annular manner. Then the hub is placed on the blades, and the hub is positioned and loaded through the hub fixture. Then the hub and blades are welded from the back. However, since the connection between the blades and the hub has a certain inclination angle, the blade grooves are usually inclined grooves. It is relatively simple to fix the blades individually and they can be inserted at an angle. However, after all the blades are welded to the hub, it is relatively difficult to pull all the blades out of the corresponding grooves at the same time, which can easily cause deformation of the blades and affect the quality of the impeller. Summary of the invention

[0004] The object of the present invention is to provide a clamping and positioning device for welding centrifugal pump impellers, so as to facilitate material removal after welding and prevent deformation, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a clamping and positioning device for welding a centrifugal pump impeller, comprising a split base, a chassis and a pressure plate, a shallow inclined blade slot is provided in an annular shape on the chassis, and the pressure plate is matched and assembled with the chassis for loading the hub; and further comprising:

[0006] The blade clamping mechanism is used to fix the blades. A mounting seat is provided at the end of each blade slot on the chassis. An arc-shaped inner clamping strip and an outer clamping strip are slidably mounted on the mounting seat. The inner clamping strip and the outer clamping strip are kept in a discrete state by a first spring. A kneading assembly is provided on the mounting seat to control the aggregation of the inner clamping strip and the outer clamping strip.

[0007] Magnetic drive mechanism, which is used to drive the inner clamping strip and the outer clamping strip to converge. A central cylinder is provided in the middle of the chassis, on which a turntable with a push rod is rotatably installed. When the turntable rotates, the kneading assembly is driven. When the pressure plate is assembled, the turntable can be driven to rotate through magnetic coupling;

[0008] A drive shaft is provided at the bottom of the chassis. The drive shaft controls the rotation of the fixture through a ring gear linked to a gear. The bottom of the central cylinder is connected to an impact head through a second spring. When the fixture rotates, the drive shaft can periodically press down the impact head to store energy. After welding is completed, the impact head releases its elastic force, and the impeller is ejected from the blade card slot through the movable lifting plate on the central cylinder.

[0009] Preferably, a limiting groove and a welding groove are provided at the bottom of the pressure plate. The limiting groove restricts the circumferential displacement of the hub, and the welding groove provides a welding path.

[0010] The chassis is installed with a support ring through a bottom support. During welding, it supports the edge of the hub from the bottom to inhibit thermal deformation.

[0011] Preferably, both the inner clamping strip and the outer clamping strip are connected to the inner slider in the mounting seat, and the inner slider is connected with a guide rod, which can limit the moving direction of the inner clamping strip and the outer clamping strip.

[0012] A first spring is fixedly connected to the inner slider.

[0013] Preferably, an inclined end block is fixedly connected to the inner slider, and a sliding rod is slidably installed on the mounting seat. The end of the sliding rod is connected with a pressing part in a Π-shaped structure, and the pressing part can compress the inner slider along the inclined direction of the inclined block, so that the inner clamping strip and the outer clamping strip converge inward.

[0014] Preferably, push rods are annularly arranged on the turntable, and the push rods are located on the side of the pressing part. When the turntable rotates, the push rods can squeeze the pressing part to achieve the effect of the inner and outer clamping strips converging.

[0015] Preferably, a positioning magnet is installed on the turntable, and a guiding magnet is provided on the pressure plate. When the pressure plate is assembled on the chassis, the turntable can be rotated under the action of magnetic force.

[0016] Preferably, a positioning rod is installed on the chassis, and a positioning hole is provided on the pressure plate. The pressure plate can be assembled above the chassis at a set angle and position.

[0017] Preferably, the limiting groove is a circular groove, and the welding groove is correspondingly arranged with the blade card slot, and the welding groove is arc-shaped.

[0018] Preferably, shaft seats are annularly installed on the base, and a fixture is rotatably installed on the top of the shaft seats. The fixture can rotate to the top surface of the pressure plate to fix the pressure plate from the top.

[0019] A gear coaxial with the fixture is installed at the bottom of the shaft seat. The drive shaft is connected to the servo motor in the welding machine, and the drive shaft rotates half a turn each time.

[0020] Preferably, a ring gear is fixedly installed on the drive shaft, and the ring gear has the same tooth ratio as the gear and meshes with the gear.

[0021] Preferably, a control shaft is connected to the top of the drive shaft, a pressing block is installed on the side of the control shaft, the control shaft extends into the central cylinder, a chassis is installed at the bottom of the central cylinder, an impact head is connected thereto through a second spring, the impact head is a circular arc structure with a notch, and the top surface of the impact head is an inclined surface. When the fixture is in the standby state, the pressing block on the control shaft is in the notch of the impact head, and during the process of the fixture rotating one circle, the pressing block can press down the impact head.

[0022] Preferably, a jacking plate with a protective layer is arranged at the top of the central cylinder, and a suspension ball is installed at the bottom of the jacking plate. The suspension ball is in the central cylinder. When the impact head moves upward under the action of elastic force, it can impact the suspension ball.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The present invention can improve the welding precision, reduce the deformation of the impeller, adopt hierarchical linkage clamping, synchronously limit the blades through the inner clamping strip and the outer clamping strip, avoid the offset or dislocation of the blades during the welding process, ensure the uniformity of the weld seam, and preset an anti-deformation structure. Through the cooperation of the support ring and the limiting groove, the deformation of the hub is restricted during welding, the residual stress is reduced, and the inner and outer clamping strips can also automatically reset and open after the limit of the pressure plate is released.

[0025] 2. After welding, the parts can be taken out quickly and without damage, improving the production efficiency. By setting an automatic jacking and demoulding mechanism, during the operation of the fixture, elastic potential energy is automatically accumulated. After welding is completed, the impact head pushes the jacking plate under the action of the spring, and the impeller is smoothly jacked out of the blade clamping groove, avoiding deformation or scratching caused by manual violent disassembly. After the pressure plate is removed, the inner and outer clamping strips automatically reset through the spring, the blades can be released from the restraint, and in cooperation with the jacking and demoulding mechanism, the part-taking time is shortened, and the deformation of the blades is effectively prevented. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the position of the clamping and positioning device of the present invention on the welding machine.

[0027] Figure 2 It is a schematic diagram of the overall structure of the clamping and positioning device of the present invention.

[0028] Figure 3 It is a schematic diagram of the chassis of the present invention and the structures thereon.

[0029] Figure 4 It is a schematic diagram of the chassis structure of the present invention.

[0030] Figure 5 It is a schematic diagram of the inner and outer clamping strip structures of the present invention.

[0031] Figure 6 It is a schematic diagram of the inner and outer clamping strips and the mounting seat structures of the present invention.

[0032] Figure 7 It is a schematic diagram of the internal structure of the mounting base of the present invention.

[0033] Figure 8 It is a bottom schematic diagram of the pressure plate structure of the present invention.

[0034] Figure 9 It is a schematic diagram of the fixture and its control structure of the present invention.

[0035] Figure 10 It is a schematic diagram of the lifting plate and its driving structure of the present invention.

[0036] Figure 11 It is a schematic diagram of the compression impact head structure of the present invention.

[0037] In the figure: 1, base; 2, chassis; 3, blade card slot; 4, mounting base; 5, inner clamping strip; 6, outer clamping strip; 7, inner slider; 8, guide rod; 9, first spring; 10, inclined end block; 11, slide rod; 12, pressing part; 13, central cylinder; 14, turntable; 15, push rod; 16, positioning magnet; 17, positioning rod; 18, pressure plate; 19, positioning hole; 20, limiting groove; 21, welding groove; 22, guiding magnet; 23, bottom support; 24, support ring; 25, shaft seat; 26, fixture; 27, gear; 28, driving shaft; 29, gear ring; 30, control shaft; 31, pressing block; 32, bottom plate; 33, second spring; 34, impact head; 35, lifting plate; 36, hanging ball; 37, limiting ring. Specific embodiments

[0038] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments. It should be known that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0039] Please refer to Figures 1 to 11 , the present invention provides a technical solution: a clamping and positioning device for centrifugal pump impeller welding, which is mainly used in the manufacturing of metal cutting and welding equipment such as automatic and semi-automatic arc and plasma arc welding machines. The clamping and positioning device is of a split structure and is integrally composed of three parts: a base 1, a chassis 2, and a pressure plate 18, which are respectively used for the combined limit of the pressure plate 18 and the chassis 2, the limit of the blade, and the limit of the hub.

[0040] Such as Figures 1 - 3As shown, the base 1 is installed in the centrifugal pump impeller welding machine, and the chassis 2 is fixedly installed in the middle of the base 1. A plurality of blade clamping slots 3 are annularly arranged on the chassis 2. The blade clamping slots 3 are shallow inclined slots, which only perform bottom limit clamping of the blades. At the same time, a plurality of mounting seats 4 are installed on the chassis 2. The mounting seats 4 are located at the ends of the blade clamping slots 3. An arc-shaped inner clamping strip 5 and an outer clamping strip 6 are slidably installed on the mounting seats 4. The inner clamping strip 5 and the outer clamping strip 6 are respectively located on both sides of the blade clamping slot 3. When the inner clamping strip 5 and the outer clamping strip 6 converge towards the blade clamping slot 3, they can perform upper limit clamping on the blade to keep it in a stable welding state. After welding is completed, the inner clamping strip 5 and the outer clamping strip 6 can be separated to facilitate the extraction of the blade from the blade clamping slot 3 and prevent it from deforming.

[0041] As Figures 3 - 7 shown, both the inner clamping strip 5 and the outer clamping strip 6 are connected to the inner slider 7 in the mounting seat 4, and the inner slider 7 is connected to a guide rod 8. The guide rod 8 can limit the moving direction of the inner clamping strip 5 and the outer clamping strip 6. At the same time, a first spring 9 is fixedly connected to the inner slider 7. Through the elastic force of the first spring 9, the inner clamping strip 5 and the outer clamping strip 6 can be kept in a separated state. A bevel end block 10 is fixedly connected to the inner slider 7, and a slide rod 11 is slidably installed on the mounting seat 4. The end of the slide rod 11 is connected to a pressing member 12. The pressing member 12 is of a Π-shaped structure. The pressing member 12 can compress the inner slider 7 along the inclined surface direction of the inclined surface pressing block 31, so that the inner clamping strip 5 and the outer clamping strip 6 converge inward. A central cylinder 13 is provided in the middle of the chassis 2. A turntable 14 is rotatably installed through the central cylinder 13. A plurality of push rods 15 are annularly arranged on the turntable 14. The push rods 15 are located on the side of the pressing member 12. When the turntable 14 rotates, the push rods 15 can squeeze the pressing member 12, so as to achieve the effect of the inner and outer clamping strips 6 converging. A positioning magnet 16 is installed on the turntable 14, and a guiding magnet 22 is provided on the pressing plate 18. When the pressing plate 18 is assembled on the chassis 2, the turntable 14 can be rotated under the action of magnetic force. Thus, when the pressing plate 18 is assembled, the inner and outer clamping strips 6 clamp the blade and enter the welding state. After the pressing plate 18 is removed, the inner and outer clamping strips 6 can be loosened to facilitate the material taking of the welded impeller.

[0042] As Figure 8As shown, a positioning rod 17 is installed on the chassis 2, and a positioning hole 19 is provided on the pressure plate 18, so that the pressure plate 18 can be assembled above the chassis 2 at a set angle and position. On the one hand, it ensures the alignment of the blade and the hub, and on the other hand, it ensures that the guiding magnet 22 can smoothly guide the turntable 14 to rotate to a predetermined angle. A limiting groove 20 is provided at the bottom of the pressure plate 18. The limiting groove 20 is a circular groove, which can limit the hub therein. At the same time, a welding groove 21 corresponding to the blade clamping groove 3 is also provided on the pressure plate 18. The welding groove 21 is also arc-shaped, which is used to provide a working path for the welding head to weld the blade from the back. A circular support ring 24 is also installed on the chassis 2 through a bottom support 23. When the pressure plate 18 positions the hub from the top, the support ring 24 supports the edge of the hub from the bottom to prevent the hub from thermal deformation due to welding.

[0043] As Figure 9 shown, three shaft seats 25 are annularly installed on the base 1. A clamp 26 is rotatably installed on the top of the shaft seat 25. The clamp 26 can rotate to the top surface of the pressure plate 18 to fix the pressure plate 18 from the top, so that the pressure plate 18 and the chassis 2 maintain a stable assembled state for welding work. A gear 27 coaxial with the clamp 26 is installed at the bottom of the shaft seat 25, and the rotation of the gear 27 drives the clamp 26 to change its position. A drive shaft 28 is provided at the bottom of the chassis 2. The drive shaft 28 is connected to the servo motor in the welding machine. The drive shaft 28 rotates half a turn each time. A gear ring 29 is fixedly installed on the drive shaft 28. The gear ring 29 has the same tooth ratio as the gear 27, and the gear ring 29 meshes with all the gears 27. When the gear ring 29 rotates half a turn, the clamp 26 can also rotate half a turn. The clamp 26 rotates from the standby state to above the pressure ring for clamping, and then rotates half a turn again after welding to return to the standby state.

[0044] As Figure 10 、 Figure 11As shown, a control shaft 30 is connected to the top of the drive shaft 28 of the present invention. A pressing block 31 is installed on the side of the control shaft 30, and the control shaft 30 extends into the central cylinder 13. A chassis 2 is installed at the bottom of the central cylinder 13, and an impact head 34 is connected thereto through a second spring 33. The impact head 34 is a circular arc structure with a notch, and the top surface of the impact head 34 is an inclined surface. When the clamp 26 is in the standby state, the pressing block 31 on the control shaft 30 is in the notch of the impact head 34. During one rotation of the clamp 26, the pressing block 31 continuously presses down the impact head 34 until it returns to the notch. At this time, the elastic potential energy of the second spring 33 causes the impact head 34 to move upward. A jacking plate 35 with a protective layer is provided at the top of the central cylinder 13. A suspension ball 36 is installed at the bottom of the jacking plate 35, and the suspension ball 36 is located in the central cylinder 13. When the impact head 34 moves upward under the action of the elastic force, it can impact the suspension ball 36, causing the jacking plate 35 to rise, generating a thrust from the bottom surface of the welded impeller to assist it in detaching from the chassis 2. Therefore, during welding, after the blades and the hub are limited by the chassis 2 and the pressure plate 18, the clamp 26 rotates half a turn and moves above the pressure plate 18 to press the pressure plate 18. After welding is completed, the clamp 26 continues to rotate half a turn. After the clamp 26 detaches from the pressure plate 18, the operator first removes the pressure plate 18, relaxes the inner and outer clamping strips 6. Then, as the clamp 26 returns to its original position completely, the jacking plate 35 jacks up the impeller from the center position of the bottom surface of the impeller, causing the blades to completely detach from the blade slots 3, facilitating the operator to directly pick them up and improving work efficiency.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made therein without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping and positioning device for the welding of a centrifugal pump impeller, comprising a split base, a chassis and a pressure plate, characterized in that: The chassis is annularly provided with shallow inclined blade slots, and the pressure plate is assembled with the chassis in a matching manner for the loading of the hub; it also includes: A blade clamping mechanism for fixing the blade. At the end of each blade slot on the chassis, there is a mounting seat. An arc-shaped inner clamping strip and an outer clamping strip are slidably mounted on the mounting seat. The inner clamping strip and the outer clamping strip are kept in a discrete state by a first spring, and a kneading component is arranged on the mounting seat to control the aggregation of the inner clamping strip and the outer clamping strip; A magnetic drive mechanism for driving the aggregation of the inner clamping strip and the outer clamping strip. A central cylinder is arranged in the middle of the chassis, and a turntable with a push rod is rotatably mounted on it. When the turntable rotates, it drives the kneading component, and when the pressure plate is assembled, it can drive the turntable to rotate through magnetic coupling; A drive shaft is arranged at the bottom of the chassis. The drive shaft controls the rotation of the fixture through a gear ring linked to a gear; the bottom of the central cylinder is connected to an impact head through a second spring. When the fixture rotates, the drive shaft can periodically press down the impact head to store energy. After welding is completed, the impact head releases the elastic force, and the impeller is ejected from the blade slot through a movable lifting plate on the central cylinder.

2. The clamping and positioning device for centrifugal pump impeller welding according to claim 1, wherein: The bottom of the pressure plate is provided with a limit groove and a welding groove. The limit groove restricts the circumferential displacement of the hub, and the welding groove provides a welding path; The chassis is installed with a support ring through a bottom support. During welding, it supports the edge of the hub from the bottom to inhibit thermal deformation.

3. The clamping and positioning device for centrifugal pump impeller welding according to claim 1, characterized in that: Both the inner clamping strip and the outer clamping strip are connected to an inner slider in the mounting seat, and the inner slider is connected with a guide rod, which can limit the moving direction of the inner clamping strip and the outer clamping strip; The first spring is fixedly connected to the inner slider.

4. The clamping and positioning device for centrifugal pump impeller welding according to claim 3, characterized in that: An inclined end block is fixedly connected to the inner slider, and a sliding rod is slidably mounted on the mounting seat. The end of the sliding rod is connected with a pressing part in a Π-shaped structure, and the pressing part can compress the inner slider along the inclined direction of the inclined block, so that the inner clamping strip and the outer clamping strip aggregate inward.

5. The clamping and positioning device for centrifugal pump impeller welding according to claim 4, wherein: Push rods are annularly arranged on the turntable, and the push rods are located on the side of the pressing part. When the turntable rotates, the push rods can squeeze the pressing part to achieve the effect of aggregating the inner and outer clamping strips.

6. The clamping and positioning device for centrifugal pump impeller welding according to claim 5, characterized in that: A positioning magnet is installed on the turntable, and a guiding magnet is arranged on the pressure plate. When the pressure plate is assembled on the chassis, it can make the turntable rotate under the action of magnetic force.

7. A clamping and positioning device for the welding of a centrifugal pump impeller according to claim 1, characterized in that: A positioning rod is installed on the chassis, and a positioning hole is arranged on the pressure plate. The pressure plate can be assembled above the chassis at a set angle and position.

8. A clamping and positioning device for the welding of a centrifugal pump impeller according to claim 2, characterized in that: The limit groove adopts a circular groove, and the welding groove is arranged corresponding to the blade slot, and the welding groove is arc-shaped.

9. A clamping and positioning device for welding a centrifugal pump impeller according to claim 1, characterized in that: Axle seats are annularly installed on the base, and a fixture is rotatably mounted on the top of the axle seat. The fixture can rotate to the top surface of the pressure plate to fix the pressure plate from the top; A gear coaxial with the fixture is installed at the bottom of the axle seat. The drive shaft is connected to the servo motor in the welding machine, and the drive shaft rotates half a turn each time.

10. A clamping and positioning device for centrifugal pump impeller welding according to claim 9, characterized in that: A gear ring is fixedly installed on the drive shaft, and the gear ring has the same tooth ratio as the gear and meshes with the gear.

11. A clamping and positioning device for centrifugal pump impeller welding according to claim 10, characterized in that: A control shaft is connected to the top of the drive shaft, and a pressing block is installed on the side of the control shaft. The control shaft extends into the central cylinder. A chassis is installed at the bottom of the central cylinder, and an impact head is connected thereto through a second spring. The impact head is a circular arc structure with a notch, and the top surface of the impact head is an inclined surface. When the fixture is in the standby state, the pressing block on the control shaft is in the notch of the impact head, and during one rotation of the fixture, the pressing block can press down the impact head.

12. A clamping and positioning device for the welding of a centrifugal pump impeller according to claim 11, characterized in that: A jacking plate with a protective layer is arranged at the top of the central cylinder, and a suspension ball is installed at the bottom of the jacking plate. The suspension ball is in the central cylinder. When the impact head moves upward under the action of elastic force, it can impact the suspension ball.

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