Automatic punching system and method for pump cover of multistage centrifugal pump

Abstract

The invention belongs to the technical field of multi-stage centrifugal pump production, and particularly relates to an automatic punching system and method for a pump cover of a multi-stage centrifugal pump, all assemblies cooperate with one another, and a clamping assembly is used for clamping a pump cover body and driving the pump cover body to rotate in the horizontal circumferential direction and rotate around the axis of the pump cover body; an H-shaped groove is formed in the pump cover body in a punching mode along the cylindrical spiral line through a notching assembly; the inner spiral supporting body and the outer spiral supporting body are correspondingly conveyed to preset positions on the inner side and the outer side of the pump cover body through the supporting body feeding assembly; the locking assembly is used for bending the protruding pieces defined by the H-shaped grooves towards the inner side or the outer side in a staggered mode, and then an inner locking piece used for locking the inner spiral supporting body and an outer locking piece used for locking the outer spiral supporting body are formed. In this way, the requirements for automatic punching and assembling of the reinforced pump cover are met, the reliability of connection between the pump cover body and the inner spiral supporting body and between the pump cover body and the outer spiral supporting body is high, connection is achieved without additional tedious procedures, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of multi-stage centrifugal pump production, and particularly relates to an automatic punching system and method for the pump cover of a multi-stage centrifugal pump. Background Art

[0002] A multi-stage centrifugal pump is a centrifugal pump with an overall compact structure, small volume, light weight, low noise, and remarkable energy-saving effect, and is convenient for maintenance. It adopts a standard motor and a quick-install mechanical seal, which is very convenient to replace. The flow-through part of the pump is made of stainless steel material and can be applicable to slightly corrosive media. When the motor drives the impeller on the shaft to rotate at a high speed, the liquid filled in the impeller is thrown to the periphery of the impeller along the flow path between the blades under the action of centrifugal force. Due to the action of the blades on the liquid, the pressure and speed are increased simultaneously, and the liquid is led to the next-stage impeller through the flow path of the guide shell. Just based on this principle, the liquid flows through all the impellers and guide shells successively, further increasing the pressure energy of the liquid.

[0003] The pump cover of a traditional multi-stage centrifugal pump has a relatively thin cover body. The relatively thin pump cover can reduce the material consumption, lower the weight and production cost of the whole pump, and is also convenient for transportation and installation. However, the relatively thin cover body is prone to deformation or cracking under high-pressure working conditions, which may cause leakage or vibration problems, affecting the sealing performance and operation stability of the pump. Therefore, the company has designed a reinforced pump cover applicable to multi-stage centrifugal pumps, which greatly improves the overall structural strength of the pump cover by respectively adding an inner spiral support and an outer spiral support on the inner and outer sides of the pump cover body.

[0004] In the process of manufacturing the above-mentioned reinforced pump cover, an automatic punching system is required for punching and assembling work. However, the traditional pump cover punching system has deficiencies. One is that it cannot meet the requirements of automatic punching and assembling of the reinforced pump cover; the other is that it cannot form locking pieces with different orientations during the formation of the liquid inlet hole of the pump cover body to achieve reliable connection with the inner and outer spiral supports, resulting in the need for additional cumbersome processes to achieve the connection, increasing the manufacturing cost. Therefore, it is necessary to optimize and improve the traditional pump cover punching system. Summary of the Invention

[0005] The purpose of the present invention is to overcome at least one of the above problems existing in the prior art, and provide an automatic punching system and method for the pump cover of a multi-stage centrifugal pump.

[0006] To achieve the above technical purposes and reach the above technical effects, the present invention is realized through the following technical solutions: The present invention provides an automatic punching system for the pump cover of a multi-stage centrifugal pump, including: A clamping assembly, wherein the clamping assembly is provided with loading and unloading stations, a notching station, a support body feeding station and a locking station in sequence along the horizontal circumferential direction; the clamping assembly is used to clamp the pump cover body and can drive it to perform horizontal circumferential rotation and rotation around its own axis; A notching assembly, which is arranged near the notching station and is used to punch a plurality of H-shaped grooves along a cylindrical spiral line on the pump cover body; A support body feeding assembly, which is arranged near the support body feeding station and is used to convey the inner spiral support body and the outer spiral support body to the preset positions inside and outside the pump cover body respectively; The locking assembly is arranged near the locking station, and is used to bend the protrusions surrounded by the H-shaped grooves in the pump cover body in an alternating manner inward or outward. Bending inward can form an inner locking piece for locking the inner spiral support body, and bending outward can form an outer locking piece for locking the outer spiral support body.

[0007] Furthermore, in the above-mentioned multi-stage centrifugal pump cover automated punching system, the reinforced pump cover is formed by locking the pump cover body, the inner spiral support body, and the outer spiral support body together; the convex piece surrounded by the H-shaped groove of the pump cover body is bent to form a middle liquid inlet hole, the inner spiral support body is equidistantly provided with a number of inner liquid inlet holes, and the outer spiral support body is equidistantly provided with a number of outer liquid inlet holes, the positions of the middle liquid inlet hole, the inner liquid inlet hole and the outer liquid inlet hole correspond to each other one by one, and together constitute a liquid inlet channel.

[0008] Furthermore, in the above-mentioned multi-stage centrifugal pump cover automated punching system, the middle liquid inlet hole, the inner liquid inlet hole and the outer liquid inlet hole have the same specifications, and the liquid inlet channel is a channel of equal width; or the specification of the middle liquid inlet hole is smaller than the specifications of the inner liquid inlet hole and the outer liquid inlet hole, and the liquid inlet channel is a variable width channel that is narrow in the middle and wide at the top and bottom.

[0009] Furthermore, in the above-mentioned multi-stage centrifugal pump cover automated punching system, the clamping assembly includes a base plate, a first motor, a turntable, a mounting seat, a second motor, an umbrella-shaped steering gear set, a transverse shaft and a multi-claw clamp, a first motor is installed on the upper side of the base plate, an output end of the first motor is supported with a mounting seat via a turntable, a plurality of second motors are circumferentially installed on the upper side of the mounting seat, an output shaft of each second motor is transmission-connected to one end of the transverse shaft via an umbrella-shaped steering gear set, and a multi-claw clamp for clamping the pump cover body is installed on the other end of the transverse shaft.

[0010] Further, in the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, the grooving assembly includes a first side substrate, a first horizontal push rod, a first vertical plate, a first cross plate, a grooving push rod, an H-shaped grooving tool, and a pressure-bearing block. The first horizontal push rod is installed on the first side substrate, the movable end of the first horizontal push rod is installed with the first vertical plate, the first cross plate and the pressure-bearing block located below it are installed on the outer side of the first vertical plate, the grooving push rod is installed on the first vertical plate, the movable end of the grooving push rod is installed with the H-shaped grooving tool, and an avoidance groove matching the H-shaped grooving tool is opened on the upper side of the pressure-bearing block.

[0011] Further, in the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, the support body feeding assembly includes a second side substrate, a second horizontal push rod, a second vertical plate, an inner support plate, an outer support plate, and a support plate driving mechanism. The second horizontal push rod is installed on the second side substrate, the movable end of the second horizontal push rod is installed with the second vertical plate, multiple groups of inner support plates and outer support plates are installed on the outer side of the second vertical plate in the circumferential direction, a support plate driving mechanism for driving the inner support plate and the outer support plate in the same group to flip relative to each other is installed on the second vertical plate, a first positioning groove matching the inner spiral support body is opened on the outer side of the inner support plate, and a second positioning groove matching the outer spiral support body is opened on the inner side of the outer support plate.

[0012] Further, in the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, the support plate driving mechanism includes a third motor, a face gear, a radial shaft, a bevel gear, a pressure block, and a return spring. The third motor is installed on the second vertical plate, the output end of the third motor is installed with the face gear, a bevel gear matching the face gear is installed at one end of the radial shaft, two screw rod sections with opposite helix directions are arranged on the radial shaft, the inner support plate and the outer support plate cross each other near the inner end and a positioning pin is installed at the crossing point, perforations for facilitating the radial shaft to pass through are opened at the inner ends of the inner support plate and the outer support plate, screw rod grooves matching the corresponding screw rod sections are opened on the pressure block, two pressure blocks are provided and respectively abut against the outer sides of the inner ends of the inner support plate and the outer support plate, and a return spring is sleeved on the shaft body of the radial shaft between the inner ends of the inner support plate and the outer support plate; an activity cavity for facilitating the movement of the face gear and the bevel gear and a radial groove for facilitating the relative flipping of the two support plates and the radial displacement of the pressure block are opened on the second vertical plate, and the inner end of the radial groove is communicated with the activity cavity through a through shaft groove.

[0013] Further, in the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, the locking assembly includes a third side substrate, a third horizontal push rod, a rotary drive, a third vertical plate, a second horizontal plate, a bending push rod, a bending punch, a lead screw motor, a lead screw, a movable horizontal plate, and a mechanical internal support jaw. The third horizontal push rod is installed on the third side substrate. The movable end of the third horizontal push rod is installed with a rotary drive. The outer side of the movable ring of the rotary drive is installed with a third vertical plate. The second horizontal plate and the lead screw motor are fixed on the outer side of the third vertical plate. The bending push rod is fixed on the second horizontal plate. The movable end of the bending push rod is installed with a bending punch. The output end of the lead screw motor is installed with a lead screw. The outer side of the lead screw is sleeved and installed with a movable horizontal plate that cooperates with it. One end of the movable horizontal plate is slidably restricted on the third vertical plate, and the other end of the movable horizontal plate is installed with a mechanical internal support jaw at a position opposite to the bending punch.

[0014] Further, in the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, it further includes a controller and a loading and unloading manipulator. The loading and unloading manipulator is arranged near the loading and unloading station and is used to realize the loading operation of the pump cover body and the unloading operation of the reinforced pump cover. The controller is respectively connected to the clamping assembly, the grooving assembly, the support body feeding assembly, the locking assembly, and the loading and unloading manipulator.

[0015] The present invention also provides an automatic punching method for the pump cover of a multi-stage centrifugal pump, which is realized based on the above-mentioned automatic punching system for the pump cover of a multi-stage centrifugal pump, and includes the following steps: S1. Use the loading and unloading manipulator to send the pump cover body into the loading and unloading station of the clamping assembly. S2. Use the clamping assembly to clamp the pump cover body and drive it to rotate from the loading and unloading station to the grooving station, and use the grooving assembly to punch an H-shaped groove along a cylindrical helix on the pump cover body. S3. Use the clamping assembly to drive the pump cover body to rotate from the grooving station to the support body feeding station, and use the support body feeding assembly to correspondingly transport the inner spiral support body and the outer spiral support body to the preset positions inside and outside the pump cover body. S4. Use the clamping assembly to drive the pump cover body, the inner spiral support body, and the outer spiral support body to rotate from the support body feeding station to the locking station, and use the locking assembly to bend the tabs surrounded by the H-shaped groove in the pump cover body alternately inward or outward. Bend inward to form an inner locking piece for locking the inner spiral support body, and bend outward to form an outer locking piece for locking the outer spiral support body; finally, obtain a reinforced pump cover. S5. Use the clamping assembly to drive the reinforced pump cover to rotate from the locking station to the loading and unloading station, and use the loading and unloading manipulator to take away the reinforced pump cover from the loading and unloading station.

[0016] The beneficial effects of the present invention are: 1. The present invention provides an automatic punching system for a multi-stage centrifugal pump cover, which mainly consists of a clamping assembly, a grooving assembly, a support body feeding assembly, and a locking assembly. Each assembly cooperates with each other. The clamping assembly is used to clamp the pump cover body and drive it to perform horizontal circumferential rotation and rotation around its own axis; the grooving assembly is used to stamp an H-shaped groove on the pump cover body along a cylindrical helix; the support body feeding assembly is used to convey the inner spiral support body and the outer spiral support body to the preset positions inside and outside the pump cover body respectively; the locking assembly is used to bend the tabs surrounded by the H-shaped groove in the pump cover body alternately inward or outward, thereby forming an inner locking piece for locking the inner spiral support body and an outer locking piece for locking the outer spiral support body. In this way, the automatic punching and assembly requirements of the strengthened pump cover are met, and the connection between the pump cover body and the inner spiral support body and the outer spiral support body is relatively reliable, without the need for additional cumbersome processes to achieve the connection, reducing the manufacturing cost.

[0017] 2. The strengthened pump cover prepared by the present invention is composed of a pump cover body, an inner spiral support body, and an outer spiral support body after being locked and combined. The use of the inner spiral support body and the outer spiral support body greatly improves the overall structural strength of the pump cover. At the same time, the introduction of the inner spiral support body and the outer spiral support body also increases the length of the liquid inlet channel. According to requirements, the liquid inlet channel can be designed as a variable groove width channel with a narrow middle and wide upper and lower parts. The narrow middle section forms a Venturi effect through cross-sectional contraction, which can accelerate the fluid flow (the flow velocity is increased by 15% - 20%), enhancing the kinetic energy input efficiency at the impeller inlet; the wide upper and lower regions buffer the sudden change in flow velocity by expanding the cross-sectional area, reducing the local turbulence intensity and the risk of cavitation.

[0018] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of the whole of the present invention; Figure 2 is a schematic structural diagram of the strengthened pump cover in the present invention; Figure 3 is a semi-sectional schematic diagram of the strengthened pump cover in the present invention; Figure 4 is a schematic structural diagram of the pump cover body after processing in the present invention; Figure 5 is a schematic structural diagram of the inner and outer spiral support bodies in the present invention; Figure 6 Schematic diagram of the forming principle of the inner and outer lock pieces in the present invention; Figure 7 Schematic diagram of the structure of the clamping assembly in the present invention; Figure 8 Schematic diagram of the structure of the groove punching assembly in the present invention; Figure 9 Schematic diagram of the structure of the support body feeding assembly in the present invention; Figure 10 Front view schematic diagram of the support body feeding assembly in the present invention; Figure 11 Schematic diagram of the structure of the support plate driving mechanism in the present invention; Figure 12 Schematic diagram of the structure of a part of the support plate driving mechanism in the present invention; Figure 13 Schematic diagram of the structure of the second vertical plate in the present invention; Figure 14 Schematic diagram of the structure of the locking assembly in the present invention; Figure 15 Connection block diagram of the main components in the present invention; In the attached drawings, the components represented by each reference numeral are as follows: 1 - Clamping assembly, 101 - Bottom plate, 102 - First motor, 103 - Turntable, 104 - Mounting seat, 105 - Second motor, 106 - Horizontal shaft, 107 - Multi - jaw gripper; 2 - Groove punching assembly, 201 - First side substrate, 202 - First horizontal push rod, 203 - First vertical plate, 204 - First cross plate, 205 - Groove punching push rod, 206 - H - shaped groove punching knife, 207 - Bearing block, 208 - Avoidance groove; 3 - Support body feeding assembly, 301 - Second side substrate, 302 - Second horizontal push rod, 303 - Second vertical plate, 304 - Inner support plate, 305 - Outer support plate, 306 - Third motor, 307 - Face gear, 308 - Radial shaft, 309 - Bevel gear, 310 - Pressure block, 311 - Return spring, 312 - First positioning groove, 313 - Second positioning groove, 314 - Radial groove, 315 - Shaft passing groove; 4 - Locking assembly, 401 - Third side substrate, 402 - Third horizontal push rod, 403 - Rotary actuator, 404 - Third vertical plate, 405 - Second cross plate, 406 - Bending push rod, 407 - Bending punch, 408 - Lead screw motor, 409 - Lead screw, 410 - Movable cross plate, 411 - Mechanical inner support jaw; 5-reinforced pump cover, 51-pump cover body, 511-middle liquid inlet hole, 512-inner locking plate, 513-outer locking plate, 514-H-shaped groove, 52-inner spiral support body, 521-inner liquid inlet hole, 53-outer spiral support body, 531-outer liquid inlet hole; 6- Controller; 7- Loading and unloading robot. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 - 6 As shown, this embodiment provides an automated punching system for a multi-stage centrifugal pump cover, including a clamping assembly 1, a notching assembly 2, a support body feeding assembly 3 and a locking assembly 4. The clamping assembly 1 is provided with loading and unloading stations, a notching station, a support body feeding station and a locking station in sequence along the horizontal circumference. The clamping assembly 1 is used to clamp the pump cover body 51, and can drive it to perform horizontal circumferential rotation and rotation around its own axis. The notching assembly 2 is arranged close to the notching station, and is used to punch a plurality of H-shaped grooves 514 along a cylindrical spiral line on the pump cover body 51. The support body feeding assembly 3 is arranged close to the support body feeding station, and is used to convey the inner spiral support body 52 and the outer spiral support body 53 to the preset positions on the inner and outer sides of the pump cover body 51 respectively. The locking assembly 4 is arranged near the locking station, and is used to alternately bend the convex pieces surrounded by the H-shaped grooves 514 in the pump cover body 51 inward or outward. The inner bending can form the inner locking piece 512 for locking the inner spiral support body 52, and the outer bending can form the outer locking piece 513 for locking the outer spiral support body 53. The inner locking piece 512 and the outer locking piece 513 are in a quasi-L-shaped structure.

[0023] In this embodiment, the reinforced pump cover 5 is assembled by locking the pump cover body 51, the inner spiral support body 52, and the outer spiral support body 53. The convex piece surrounded by the H-shaped groove 514 of the pump cover body 51 is bent to form a middle liquid inlet hole 511, the inner spiral support body 52 is provided with a plurality of inner liquid inlet holes 521 at equal intervals, and the outer spiral support body 53 is provided with a plurality of outer liquid inlet holes 531 at equal intervals. The positions of the middle liquid inlet hole 511, the inner liquid inlet hole 521, and the outer liquid inlet hole 531 correspond to each other, and together constitute a liquid inlet channel.

[0024] In this embodiment, the specifications of the middle liquid inlet hole 511, the inner liquid inlet hole 521 and the outer liquid inlet hole 531 are the same, and the liquid inlet channel is a channel of equal slot width. Alternatively, the specifications of the middle liquid inlet hole 511 are smaller than those of the inner liquid inlet hole 521 and the outer liquid inlet hole 531, and the liquid inlet channel is a variable slot width channel that is narrow in the middle and wide at the top and bottom. The middle narrow section forms a Venturi effect through cross-sectional contraction, which can accelerate fluid flow (flow rate increased by 15% to 20%) and enhance the kinetic energy input efficiency of the impeller inlet; the upper and lower wide areas buffer the sudden change of flow rate by expanding the cross-sectional area, reduce the local turbulence intensity, and reduce the risk of cavitation.

[0025] like Figure 7 As shown, the clamping assembly 1 includes a base plate 101, a first motor 102, a turntable 103, a mounting seat 104, a second motor 105, an umbrella-shaped steering gear set, a transverse shaft 106 and a multi-claw clamp 107. The first motor 102 is mounted on the upper side of the base plate 101, and the output end of the first motor 102 is supported by the mounting seat 104 via the turntable 103. A plurality of second motors 105 are mounted circumferentially on the upper side of the mounting seat 104, and the output shaft of each second motor 105 is transmission-connected to one end of the transverse shaft 106 through the umbrella-shaped steering gear set, and a multi-claw clamp 107 for clamping the pump cover body 51 is mounted on the other end of the transverse shaft 106. The mounting seat 104 is provided with an activity area for facilitating the activities of the umbrella-shaped steering gear set, the transverse shaft 106 and the multi-claw clamp 107. In this embodiment, in order to ensure the smooth rotation of the turntable 103, a stabilizing mechanism can be added between the turntable 103 and the base plate 101. The stabilizing mechanism consists of a lower sleeve and an upper slide tube. The lower sleeve is provided with an annular cavity that cooperates with the upper slide tube.

[0026] In this embodiment, the multi-claw clamp 107 is provided with a plurality of clamping claws that can be synchronously displaced inward or outward along the circumferential direction, and an arc-shaped rubber pad is provided on the inner side of the clamping claw to prevent crushing. In order to further improve the clamping effect of the multi-claw clamp 107, a vacuum suction cup can be added at the center of the outer side surface of the multi-claw clamp 107, and the vacuum suction cup is used to absorb the end cover of the pump cover body 51.

[0027] The working principle of the clamping assembly 1 is as follows: the first motor 102 is used to drive the multi-claw clamp to rotate horizontally through the turntable 103 and the mounting seat 104, so that the pump cover body 51 can rotate horizontally and meet the station switching requirements. The flipping mechanism composed of the second motor 105, the umbrella-shaped steering gear set, and the horizontal shaft 106 is used to drive the multi-claw clamp to flip, so as to meet the requirement of flipping the pump cover body 51 around its own axis.

[0028] like Figure 8As shown in the figure, the grooving assembly 2 includes a first side substrate 201, a first horizontal push rod 202, a first vertical plate 203, a first horizontal plate 204, a grooving push rod 205, an H-shaped grooving cutter 206 and a pressure-bearing block 207. The first horizontal push rod 202 is installed on the first side substrate 201. The movable end of the first horizontal push rod 202 is installed with the first vertical plate 203. The outer side of the first vertical plate 203 is installed with the first horizontal plate 204 and the pressure-bearing block 207 located below it. The grooving push rod 205 is installed on the first vertical plate 203. The movable end of the grooving push rod 205 is installed with the H-shaped grooving cutter 206. An avoidance groove 208 matching the H-shaped grooving cutter 206 is formed on the upper side of the pressure-bearing block 207. The upper side surface of the pressure-bearing block 207 is an arc surface matching the inner wall shape of the pump cover body 51.

[0029] The working principle of the grooving assembly 2 is as follows: The grooving push rod 205 is used to drive the H-shaped grooving cutter 206 to move downward, so as to stamp an H-shaped groove 514 on the pump cover body 51. The pressure-bearing block 207 is used to provide support for the inner wall of the pump cover body 51. After each stamping, the H-shaped grooving cutter 206 resets. The first horizontal push rod 202 is used to drive the H-shaped grooving cutter 206 and the pressure-bearing block 207 to adjust the axial position. The pump cover body 51 is driven by the clamping assembly 1 to rotate a certain angle around its own axis. In this way, the requirement of continuously stamping an H-shaped groove 514 along the cylindrical spiral line on the pump cover body 51 is met.

[0030] As Figure 9 and Figure 10 shown in the figure, the support body feeding assembly 3 includes a second side substrate 301, a second horizontal push rod 302, a second vertical plate 303, an inner support plate 304, an outer support plate 305 and a support plate driving mechanism. The second horizontal push rod 302 is installed on the second side substrate 301. The movable end of the second horizontal push rod 302 is installed with the second vertical plate 303. A plurality of groups of inner support plates 304 and outer support plates 305 are installed on the outer side of the second vertical plate 303 in the circumferential direction. A support plate driving mechanism for driving the inner support plate 304 and the outer support plate 305 in the same group to flip relative to each other is installed on the second vertical plate 303. A first positioning groove 312 matching the inner spiral support body 52 is formed on the outer side of the inner support plate 304. A second positioning groove 313 matching the outer spiral support body 53 is formed on the inner side of the outer support plate 305.

[0031] As Figure 11 and Figure 12As shown in the figure, the stay plate driving mechanism includes a third motor 306, a face gear 307, a radial shaft 308, a bevel gear 309, a pressing block 310 and a return spring 311. The third motor 306 is installed on the second vertical plate 303. A face gear 307 is installed at the output end of the third motor 306. One end of the radial shaft 308 is installed with a bevel gear 309 that mates with the face gear 307. The radial shaft 308 is provided with two screw rod sections with opposite helix directions. The inner stay plate 304 and the outer stay plate 305 cross each other near the inner end and a positioning pin (i.e., a conventional scissor connection structure) for providing positioning for the relative flipping of the two is installed at the crossing. Perforations for facilitating the passing of the radial shaft 308 are provided at the inner ends of the inner stay plate 304 and the outer stay plate 305. The pressing block 310 is provided with screw rod grooves that mate with the corresponding screw rod sections. There are two pressing blocks 310 in total, and they respectively abut against the outer sides of the inner ends of the inner stay plate 304 and the outer stay plate 305. A return spring 311 is sleeved on the shaft body of the radial shaft 308 located between the inner ends of the inner stay plate 304 and the outer stay plate 305.

[0032] As Figure 13 shown in the figure, an activity cavity for facilitating the activities of the face gear 307 and the bevel gear 309 and a radial groove 314 for facilitating the relative flipping of the two stay plates and the radial displacement of the pressing block 310 are provided on the second vertical plate 303. The inner end of the radial groove 314 communicates with the activity cavity through a shaft passing groove 315.

[0033] The working principle of the support body feeding assembly 3: The inner stay plate 304 and the outer stay plate 305 are used to clamp the inner spiral support body 52 and the outer spiral support body 53 respectively. The second horizontal push rod 302 is used to drive the inner stay plate 304, the outer stay plate 305 and the inner spiral support body 52 and the outer spiral support body 53 clamped by them to displace towards the pump cover body 51 respectively. Finally, the inner spiral support body 52 and the outer spiral support body 53 reach the preset positions inside and outside the pump cover body 51. The locking of the inner stay plate 304 and the outer stay plate 305 on the inner spiral support body 52 and the outer spiral support body 53 is released through the stay plate driving mechanism. The initial fixation of the three is achieved by relying on the frictional resistance between the inner spiral support body 52, the outer spiral support body 53 and the pump cover body 51. Then, the second horizontal push rod 302 is used to separate the inner stay plate 304 and the outer stay plate 305 from the pump cover body 51, that is, the feeding of the support body is completed.

[0034] As Figure 14As shown in the figure, the locking assembly 4 includes a third side substrate 401, a third horizontal push rod 402, a rotary drive 403, a third vertical plate 404, a second horizontal plate 405, a bending push rod 406, a bending punch 407, a lead screw motor 408, a lead screw 409, a movable horizontal plate 410, and a mechanical internal support jaw 411. A third horizontal push rod 402 is installed on the third side substrate 401. The movable end of the third horizontal push rod 402 is installed with a rotary drive 403. The outer side of the movable ring of the rotary drive 403 is installed with a third vertical plate 404. The outer side of the third vertical plate 404 is fixed with a second horizontal plate 405 and a lead screw motor 408. A bending push rod 406 is fixed on the second horizontal plate 405. The movable end of the bending push rod 406 is installed with a bending punch 407. The output end of the lead screw motor 408 is installed with a lead screw 409. The outer side of the lead screw 409 is sleeved and installed with a movable horizontal plate 410 that cooperates with it. One end of the movable horizontal plate 410 is slidably restricted on the third vertical plate 404. The other end of the movable horizontal plate 410 is installed with a mechanical internal support jaw 411 at a position opposite to the bending punch 407.

[0035] The working principle of the locking assembly 4 is as follows: When it is necessary to lock the inner spiral support 52 with the pump cover body 51, the bending push rod 406 is used to drive the bending punch 407 to move downward. The bending punch 407 squeezes the convex piece surrounded by the H-shaped groove 514 in the pump cover body 51, causing it to bend inward to form two opposite bending vertical plate parts. The bending push rod 406 drives the bending punch 407 to reset. At this time, the lifting mechanism composed of the lead screw motor 408, the lead screw 409, and the movable horizontal plate 410 drives the mechanical internal support jaw 411 to move upward. The two inner support jaws on both sides of the mechanical internal support jaw 411 are displaced to the area between the two bending vertical plate parts, and then the two inner support jaws are displaced outward and squeeze the bending vertical plate parts to bend outward again. During the bending process, the lifting mechanism composed of the lead screw motor 408, the lead screw 409, and the movable horizontal plate 410 drives the mechanical internal support jaw 411 to continue to move upward slowly until the two bending vertical plate parts form an inner locking piece 512 that can lock the inner spiral support 52. After each set of inner locking pieces 512 is formed and processed, the third horizontal push rod 402 is used to drive the bending punch 407 and the mechanical internal support jaw 411 to adjust the axial position. The pump cover body 51 is driven by the clamping assembly 1 to rotate a certain angle around its own axis. In this way, the requirement of forming and processing the inner locking pieces 512 at intervals along the cylindrical spiral on the pump cover body 51 to lock the inner spiral support 52 is met. Similarly, when it is necessary to lock the outer spiral support 53 with the pump cover body 51, only the rotary drive 403 is used to switch the internal and external positions of the bending punch 407 and the mechanical internal support jaw 411. Referring to the forming principle of the inner locking piece 512, the requirement of forming and processing the outer locking pieces 513 at intervals along the cylindrical spiral on the pump cover body 51 to lock the outer spiral support 53 can be met.

[0036] As Figure 15As shown in the figure, it further includes a controller 6 and a loading and unloading manipulator 7. The loading and unloading manipulator 7 is arranged close to the loading and unloading station and is used to realize the loading operation of the pump cover body 51 and the unloading operation of the reinforced pump cover 5. The controller 6 is respectively connected to the clamping assembly 1, the grooving assembly 2, the support body feeding assembly 3, the locking assembly 4 and the loading and unloading manipulator 7.

[0037] This embodiment also provides an automatic punching method for the pump cover of a multistage centrifugal pump, which is realized based on the above automatic punching system for the pump cover of a multistage centrifugal pump, and includes the following steps: S1. Use the loading and unloading manipulator 7 to send the pump cover body into the loading and unloading station of the clamping assembly 1.

[0038] S2. Use the clamping assembly 1 to clamp the pump cover body 51 and drive it to rotate from the loading and unloading station to the grooving station. Use the grooving assembly 2 to punch an H-shaped groove along a cylindrical helix on the pump cover body 51.

[0039] S3. Use the clamping assembly 1 to drive the pump cover body 51 to rotate from the grooving station to the support body feeding station. Use the support body feeding assembly 3 to convey the inner spiral support body 52 and the outer spiral support body 53 to the preset positions inside and outside the pump cover body 51 respectively.

[0040] S4. Use the clamping assembly 1 to drive the pump cover body 51, the inner spiral support body 52 and the outer spiral support body 53 to rotate from the support body feeding station to the locking station. Use the locking assembly 4 to bend the tabs surrounded by the H-shaped groove 514 in the pump cover body 51 alternately inward or outward. Bend inward to form an inner locking piece 512 for locking the inner spiral support body 52, and bend outward to form an outer locking piece 513 for locking the outer spiral support body 53; finally, obtain the reinforced pump cover 5.

[0041] S5. Use the clamping assembly 1 to drive the reinforced pump cover 5 to rotate from the locking station to the loading and unloading station. Use the loading and unloading manipulator 7 to take away the reinforced pump cover 5 from the loading and unloading station.

[0042] The specific application of this embodiment is as follows: The automatic punching system for the pump cover of a multistage centrifugal pump mainly consists of a clamping component 1, a grooving component 2, a support body feeding component 3, and a locking component 4. Each component cooperates with each other. The clamping component 1 is used to clamp the pump cover body 51 and drive it to perform horizontal circumferential rotation and rotation around its own axis; the grooving component 2 is used to stamp an H-shaped groove 514 on the pump cover body 51 along a cylindrical helix; the support body feeding component 3 is used to convey the inner spiral support body 52 and the outer spiral support body 53 to the preset positions inside and outside the pump cover body 51 respectively; the locking component 4 is used to bend the tabs surrounded by the H-shaped groove 514 in the pump cover body 51 alternately inward or outward, thereby forming an inner locking piece 512 for locking the inner spiral support body 52 and an outer locking piece 513 for locking the outer spiral support body 53; in this way, the automatic punching and assembly requirements of the reinforced pump cover are met. The connection between the pump cover body 51 and the inner spiral support body 52 and the outer spiral support body 53 is highly reliable, and there is no need for additional cumbersome processes to achieve the connection, reducing the manufacturing cost.

[0043] The prepared reinforced pump cover is composed of the pump cover body 51, the inner spiral support body 52, and the outer spiral support body 53 after being locked and combined. The use of the inner spiral support body 52 and the outer spiral support body 53 greatly improves the overall structural strength of the pump cover. At the same time, the introduction of the inner spiral support body 52 and the outer spiral support body 53 also increases the length of the liquid inlet channel. According to requirements, the liquid inlet channel can be designed as a variable groove width channel with a narrow middle part and wide upper and lower parts. The narrow middle part forms a Venturi effect through cross-sectional contraction, which can accelerate the fluid flow (the flow rate is increased by 15% - 20%), enhancing the kinetic energy input efficiency at the impeller inlet; the wide upper and lower regions buffer the sudden change in flow rate by expanding the cross-sectional area, reducing the local turbulence intensity and the risk of cavitation.

[0044] The preferred embodiments of the present invention disclosed above are only helpful for explaining the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An automatic punching system for a multi-stage centrifugal pump cover, characterized in that: include: A clamping assembly, wherein the clamping assembly is provided with loading and unloading stations, a notching station, a support body feeding station and a locking station in sequence along the horizontal circumferential direction; the clamping assembly is used to clamp the pump cover body and can drive it to perform horizontal circumferential rotation and rotation around its own axis; A notching assembly, which is arranged near the notching station and is used to punch a plurality of H-shaped grooves along a cylindrical spiral line on the pump cover body; A support body feeding assembly, which is arranged near the support body feeding station and is used to convey the inner spiral support body and the outer spiral support body to the preset positions inside and outside the pump cover body respectively; The locking assembly is arranged near the locking station, and is used to bend the protrusions surrounded by the H-shaped grooves in the pump cover body in an alternating manner inward or outward. Bending inward can form an inner locking piece for locking the inner spiral support body, and bending outward can form an outer locking piece for locking the outer spiral support body.

2. The multi-stage centrifugal pump cover automatic punching system according to claim 1 is characterized in that: The reinforced pump cover is composed of the pump cover body, the inner spiral support body and the outer spiral support body which are locked and assembled together; the convex piece surrounded by the H-shaped groove of the pump cover body is bent to form a middle liquid inlet hole, the inner spiral support body is equidistantly provided with a number of inner liquid inlet holes, and the outer spiral support body is equidistantly provided with a number of outer liquid inlet holes, the positions of the middle liquid inlet hole, the inner liquid inlet hole and the outer liquid inlet hole correspond to each other one by one, and together constitute a liquid inlet channel.

3. The multi-stage centrifugal pump cover automatic punching system according to claim 2 is characterized in that: The specifications of the middle liquid inlet hole, the inner liquid inlet hole and the outer liquid inlet hole are the same, and the liquid inlet channel is a channel of equal slot width; or the specifications of the middle liquid inlet hole are smaller than those of the inner liquid inlet hole and the outer liquid inlet hole, and the liquid inlet channel is a variable slot width channel that is narrow in the middle and wide at the top and bottom.

4. The multi-stage centrifugal pump cover automatic punching system according to claim 1, characterized in that: The clamping assembly includes a base plate, a first motor, a turntable, a mounting seat, a second motor, an umbrella-shaped steering gear set, a transverse shaft and a multi-claw clamp. The first motor is installed on the upper side of the base plate, and the output end of the first motor is supported by a mounting seat via a turntable. A plurality of second motors are circumferentially installed on the upper side of the mounting seat. The output shaft of each second motor is transmission-connected to one end of the transverse shaft through an umbrella-shaped steering gear set, and a multi-claw clamp for clamping the pump cover body is installed on the other end of the transverse shaft.

5. The multi-stage centrifugal pump cover automatic punching system according to claim 1, characterized in that: The notching assembly includes a first side substrate, a first horizontal push rod, a first vertical plate, a first cross plate, a notching push rod, an H-shaped notching knife and a pressure block. The first side substrate is equipped with a first horizontal push rod, the movable end of the first horizontal push rod is equipped with a first vertical plate, the outer side of the first vertical plate is equipped with a first cross plate and a pressure block located therebelow, the first vertical plate is equipped with a notching push rod, the movable end of the notching push rod is equipped with an H-shaped notching knife, and the upper side of the pressure block is provided with an avoidance groove that cooperates with the H-shaped notching knife.

6. The multi-stage centrifugal pump cover automatic punching system according to claim 1, characterized in that: The support body feeding assembly includes a second side base plate, a second horizontal push rod, a second vertical plate, an inner support plate, an outer support plate and a support plate driving mechanism. A second horizontal push rod is installed on the second side base plate, and a second vertical plate is installed on the movable end of the second horizontal push rod. Multiple groups of inner support plates and outer support plates are installed circumferentially on the outer side of the second vertical plate. A support plate driving mechanism for driving the inner support plates and outer support plates in the same group to flip relative to each other is installed on the second vertical plate. A first positioning groove cooperating with the outer spiral support body is provided on the outer side of the inner support plate, and a second positioning groove cooperating with the inner spiral support body is provided on the inner side of the outer support plate.

7. The multi-stage centrifugal pump cover automatic punching system according to claim 6, characterized in that: The support plate driving mechanism includes a third motor, a face gear, a radial shaft, a bevel gear, a pressure block and a return spring. The third motor is mounted on the second vertical plate, and a face gear is mounted on the output end of the third motor. One end of the radial shaft is mounted with a bevel gear matching the face gear, and two screw rod sections with opposite rotation directions are arranged on the radial shaft. The inner support plate and the outer support plate cross each other near the inner end portion and a positioning pin is installed at the intersection. The inner ends of the inner support plate and the outer support plate are provided with through holes for facilitating the radial shaft to pass through. The pressure block is provided with a screw rod groove matching the corresponding screw rod section. The pressure block is provided with two and respectively abuts against the outer sides of the inner ends of the inner support plate and the outer support plate. The radial shaft is located between the inner ends of the inner support plate and the outer support plate and is sleeved with a return spring; the second vertical plate is provided with an active cavity for facilitating the movement of the face gear and the bevel gear, and a radial groove for facilitating the relative flipping of the two support plates and the radial displacement of the pressure block, and the inner end of the radial groove is connected to the active cavity through the shaft through the shaft groove.

8. The multi-stage centrifugal pump cover automatic punching system according to claim 1, characterized in that: The locking assembly includes a third side base plate, a third horizontal push rod, a rotary drive, a third vertical plate, a second cross plate, a bending push rod, a bending punch, a screw motor, a screw, a movable cross plate and a mechanical inner support clamp, the third side base plate is installed with a third horizontal push rod, the movable end of the third horizontal push rod is installed with a rotary drive, the third vertical plate is installed on the outer side of the movable ring of the rotary drive, the second cross plate and the screw motor are fixed to the outer side of the third vertical plate, the bending push rod is fixed to the second cross plate, the movable end of the bending push rod is installed with a bending punch, the output end of the screw motor is installed with a screw, and the outer side of the screw is sleeved with a movable cross plate matching with it, one end of the movable cross plate is slidably restricted on the third vertical plate, and the other end of the movable cross plate is located at a position opposite to the bending punch and is installed with a mechanical inner support clamp.

9. The multi-stage centrifugal pump cover automatic punching system according to claim 1, characterized in that: It also includes a controller and a loading and unloading robot. The loading and unloading robot is arranged near the loading and unloading station and is used to realize the loading operation of the pump cover body and the unloading operation of the reinforced pump cover; the controller is respectively connected with the clamping assembly, the grooving assembly, the support body feeding assembly, the locking assembly and the loading and unloading robot.

10. An automated punching method for a multi-stage centrifugal pump cover, implemented based on the automated punching system for a multi-stage centrifugal pump cover according to any one of claims 1 to 9, characterized in that: The steps include: S1. Use the loading and unloading manipulator to send the pump cover body to the loading and unloading station of the clamping assembly; S2. Clamp the pump cover body with the clamping assembly and drive it to rotate from the loading and unloading station to the notching station, and use the notching assembly to punch an H-shaped groove on the pump cover body along the cylindrical spiral line; S3, using the clamping assembly to drive the pump cover body to rotate from the notching station to the support body feeding station, and using the support body feeding assembly to convey the inner spiral support body and the outer spiral support body to the preset positions inside and outside the pump cover body respectively; S4, using the clamping assembly to drive the pump cover body, the inner spiral support body, and the outer spiral support body to rotate from the support body feeding station to the locking station, and using the locking assembly to bend the convex pieces surrounded by the H-shaped grooves in the pump cover body in an alternating manner inward or outward, bending inward to form an inner locking piece for locking the inner spiral support body, and bending outward to form an outer locking piece for locking the outer spiral support body; finally, a reinforced pump cover is obtained; S5. Use the clamping assembly to drive the reinforced pump cover to rotate from the locking station to the loading and unloading station, and use the loading and unloading manipulator to remove the reinforced pump cover from the loading and unloading station.

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