A type of hardware pipe bending and stamping die

Abstract

This utility model discloses a bending and stamping die for metal pipe fittings, comprising: a processing table, on one side of which is a support plate with an inverted L-shaped design; and a bending mechanism disposed on the processing table, the bending mechanism including a lower seat and an upper seat, the top surface of the lower seat being concave and the bottom surface of the upper seat being convex, the lower seat and the upper seat being compatible, and the top surface of the lower seat having a lower bending groove and the bottom surface of the upper seat having an upper bending groove, both of which have semi-circular cross-sections. Compared with traditional planar contact bending, this method can disperse bending pressure and prevent the inner cavity of the pipe fitting from collapsing or elliptical deformation due to excessive local stress, making it particularly suitable for high-precision bending of thin-walled pipe fittings.

Description

Technical Field

[0001] This utility model relates to the technical field of hardware pipe fitting processing equipment, specifically a hardware pipe fitting bending and stamping die. Background Technology

[0002] Pipe fittings are tubular components made of metal materials (such as steel, copper, aluminum, etc.). They are widely used in water supply and drainage, HVAC, machinery, construction and other fields to transport fluids, support structures or connect other components. Bending is a process that uses external force to plastically deform pipe fittings and bend them into a specific angle or arc. The purpose is to meet the spatial layout requirements of the fittings in actual installation (such as avoiding obstacles and achieving corner connections), while optimizing the structural rationality of the pipeline system, reducing connection nodes to reduce the risk of leakage, and improving overall assembly efficiency and reliability.

[0003] A search revealed that Chinese patent application number CN202211219034.0 discloses a hardware pipe bending machine, including a support base, a mounting frame fixedly connected to the support base, a sliding sleeve slidably connected to the mounting frame, a bending mechanism provided on the mounting frame, a fixing plate fixedly connected to the mounting frame, and a limit mechanism provided on the fixing plate.

[0004] The above-mentioned technical solutions and traditional bending equipment still have defects. For example, the contact surface of the bending mechanism lacks curvature, and when the pipe is directly pressure-bent, it is easy to cause deformation of the inner cavity of the pipe and relative sliding, resulting in misalignment, making it difficult to meet the standard bending angle. Therefore, we need to propose a hardware pipe bending stamping die. Utility Model Content

[0005] The purpose of this utility model is to provide a hardware pipe bending and stamping die, which, compared with the traditional planar contact bending, can disperse the bending pressure and avoid the collapse or elliptical deformation of the inner cavity of the pipe due to excessive local stress. It is especially suitable for high-precision bending of thin-walled pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hardware pipe fitting bending and stamping die, comprising:

[0008] A processing table, wherein a support plate is provided on one side of the processing table, and the support plate is designed in an inverted L-shape;

[0009] A bending mechanism is provided on the processing table. The bending mechanism includes a lower seat and an upper seat. The top surface of the lower seat is concave, and the bottom surface of the upper seat is convex. The lower seat and the upper seat are adapted to each other. The top surface of the lower seat is provided with a lower bending groove, and the bottom surface of the upper seat is provided with an upper bending groove. The cross-sections of the lower bending groove and the upper bending groove are both semi-circular.

[0010] Preferably, it also includes an ejection mechanism disposed on the upper seat. The ejection mechanism includes an ejector and a sliding groove. The sliding groove is formed on the upper seat and the bottom opening of the sliding groove extends through the outside of the upper seat. The ejector block is slidably disposed inside the sliding groove, and when the ejector block is fully retracted into the sliding groove, it forms an integral part with the upper seat.

[0011] Preferably, the top of the ejector block is provided with a slide rod, the inner top of the slide groove is provided with a telescopic groove, the upper end of the slide rod is slidably inserted into the inner top of the slide groove and extends into the interior of the telescopic groove, and the end of the slide rod located in the telescopic groove is provided with a limit block, the limit block and the inner wall of the telescopic groove are slidably engaged.

[0012] Preferably, a compression spring is provided in the telescopic groove between the top of the limiting block and the top of the sliding groove, so that when the upper seat is raised and reset after the stamping and bending is completed, the ejector block can eject and separate the pipe attached to the upper bending groove.

[0013] Preferably, guide blocks are provided on the upper ends of the outer walls on both sides of the ejector block, and guide grooves are provided on the inner walls on both sides of the slide groove. The guide blocks and guide grooves are adapted to each other, and when the guide blocks slide to the bottom of the guide groove, they can limit the ejector block to prevent the ejector block from leaving the slide groove.

[0014] Preferably, it also includes a safety light curtain, which is set in the operating surface area of ​​the processing table. The safety light curtain includes a transmitter and a receiver. The transmitter is set on the side of the processing table located on the lower seat, and the receiver is set on the top of the support plate. The power of the equipment is immediately cut off when the user's hand enters the light curtain area.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The concave surface of the lower seat and the convex surface of the upper seat form a matching arc-shaped contact structure. Combined with the semi-circular lower and upper bending grooves (radius matching the pipe's outer diameter ≥95%), this provides a full-circumferential wrapping constraint on the pipe. Compared to traditional planar contact bending, this method disperses bending pressure, preventing collapse or elliptical deformation of the pipe's inner cavity due to excessive localized stress. It is particularly suitable for high-precision bending of thin-walled pipes.

[0017] 2. Under the action of the compression spring, the ejector block can automatically eject the pipe from the upper bending groove after bending (ejection stroke 15-20mm), avoiding the pipe from sticking to the mold due to deformation or friction, thus improving processing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

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

[0020] Figure 3 This is a schematic diagram of the ejector block of this utility model;

[0021] Figure 4 This is a schematic diagram of the slide groove of this utility model.

[0022] In the diagram: 1. Processing table; 2. Support plate; 3. Lower seat; 4. Upper seat; 5. Hydraulic cylinder; 6. Lifting plate; 7. Lower bending groove; 8. Upper bending groove; 9. Ejector block; 10. Slide groove; 11. Slide rod; 12. Limiting block; 13. Compression spring; 14. Guide block; 15. Guide groove; 16. Safety light curtain; 17. Guide rod; 18. Telescopic groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a hardware pipe fitting bending and stamping die, including: a processing table 1, a support plate 2 is provided on one side of the processing table 1, the support plate 2 is inverted L-shaped design; a bending mechanism is provided on the processing table 1, the bending mechanism includes a lower seat 3 and an upper seat 4, the top surface of the lower seat 3 is concave, the bottom surface of the upper seat 4 is convex, the lower seat 3 and the upper seat 4 are adapted to each other, and the top surface of the lower seat 3 is provided with a lower bending groove 7, the bottom surface of the upper seat 4 is provided with an upper bending groove 8, and the cross-sections of the lower bending groove 7 and the upper bending groove 8 are both semi-circular.

[0025] When in use, the hardware fitting is placed in the lower bending groove 7 of the lower seat 3. The upper seat 4 moves downward under the power drive. The outer convex bottom surface of the upper seat 4 matches the inner concave top surface of the lower seat 3. At the same time, the upper bending groove 8 and the lower bending groove 7 work together to bend the fitting. Since the cross-section of the lower and upper bending grooves 8 is semi-circular, it can better fit the shape of the fitting.

[0026] This design solves the problem of insufficient curvature in the contact surface of the bending mechanism in traditional bending equipment. The concave-convex design and the semi-circular bending groove increase the contact area and fit with the pipe fitting, reducing the deformation of the pipe fitting cavity caused by excessive local stress. At the same time, it reduces the possibility of misalignment caused by relative sliding between the pipe fitting and the bending mechanism, making the bending angle more in line with the standard.

[0027] Please refer to Figure 1-2A hydraulic cylinder 5 is installed on the top of the support plate 2, and a lifting plate 6 is installed on the top of the upper seat 4 by fixing bolts. The lower end of the hydraulic rod of the hydraulic cylinder 5 passes through the support plate 2 and is fixedly connected to the top center of the lifting plate 6.

[0028] Guide rods 17 are provided on both sides of the top of the lifting plate 6. The guide rods 17 are slidably inserted into the support plate 2 and are used to guide and limit the vertical displacement of the upper seat 4.

[0029] Hydraulic cylinder 5 is driven by a power system, which includes:

[0030] Hydraulic pump station:

[0031] The system uses a gear pump (displacement 10mL / r, rated pressure 16MPa) for oil supply and is driven by a three-phase asynchronous motor (power 3kW, speed 1450rpm). The oil tank has a capacity of 40L and a built-in air-cooled cooler (temperature control range 35-55℃) to ensure that the system can work continuously for 8 hours without overheating.

[0032] Control loop:

[0033] The hydraulic cylinder 5 is controlled by a three-position four-way solenoid directional valve (center position functional type O), and the flow rate is precisely adjusted (flow range 5-20L / min) in conjunction with the speed control valve; the system pressure is set by a pilot-operated relief valve (working pressure 8-12MPa adjustable), and the equipment is automatically unloaded to protect it in case of overload.

[0034] Displacement control:

[0035] Hydraulic cylinder 5 (63mm diameter, 100mm stroke) is equipped with a magnetostrictive displacement sensor (accuracy ±0.05mm) to provide real-time feedback on the piston position.

[0036] For a preferred implementation, please refer to Figure 1-4 The system also includes an ejector mechanism, which is installed on the upper seat 4. The ejector mechanism includes an ejector and a slide 10. The slide 10 is formed on the upper seat 4, and its bottom opening extends through the outside of the upper seat 4. The ejector block 9 is slidably disposed inside the slide 10, and when the ejector block 9 is fully retracted into the slide 10, it forms a whole with the upper seat 4. A slide rod 11 is provided on the top of the ejector block 9. A telescopic groove 18 is provided on the inner top of the slide 10. The upper end of the slide rod 11 is slidably inserted into the inner top of the slide 10 and extends into the interior of the telescopic groove 18. A limit block 12 is provided at the end of the slide rod 11 located in the telescopic groove 18, and the limit block 12 slides and engages with the inner wall of the telescopic groove 18. A compression spring 13 is provided in the telescopic groove 18 between the top of the limit block 12 and the inner top of the slide 10. When the upper seat 4 is raised and reset after the stamping and bending is completed, the ejector block 9 can eject and separate the pipe attached to the upper bending groove 8.

[0037] During the stamping and bending process, the upper seat 4 moves downward, and the ejector block 9 is subjected to the pressure of the pipe and the upper seat 4. The slide rod 11 drives the limiting block 12 to slide upward in the telescopic groove 18, and the compression spring 13 is compressed. The ejector block 9 is completely retracted into the slide groove 10 and forms an integral cooperation with the upper seat 4 to bend the lower seat 3. When the stamping and bending is completed and the upper seat 4 rises and resets, the compression spring 13 restores its deformation and generates a downward elastic force, pushing the limiting block 12 and the slide rod 11 downward, thereby causing the ejector block 9 to extend out from the bottom opening of the slide groove 10 and eject the pipe attached to the upper bending groove 8.

[0038] This allows for quick removal of the pipe fitting from the upper bending groove 8 after bending, avoiding the inconvenience of manual removal and potential safety accidents caused by improper operation, thus improving production efficiency and operational convenience and safety.

[0039] For a preferred implementation, please refer to Figure 3-4 Guide blocks 14 are provided on the upper ends of the outer walls on both sides of the ejector block 9, and guide grooves 15 are provided on the inner walls on both sides of the slide groove 10. The guide blocks 14 and guide grooves 15 are adapted to each other, and when the guide blocks 14 slide to the lower end of the guide groove 15, they can limit the ejector block 9 to prevent the ejector block 9 from leaving the slide groove 10.

[0040] During the upward and downward sliding of the ejector block 9, the guide block 14 slides along the guide groove 15, guiding the movement direction of the ejector block 9 and ensuring that it can only move in a straight line along the slide groove 10. When the ejector block 9 moves downward to a certain position, and the guide block 14 slides to the bottom of the guide groove 15, it will be blocked by the end of the guide groove 15, thereby restricting the ejector block 9 from continuing to move downward and preventing the ejector block 9 from dislodging from the slide groove 10.

[0041] This ensures the stability and accuracy of the ejector block 9's movement, prevents the ejector block 9 from shifting or dislodging from the slide 10 during movement, ensures the ejector mechanism can work normally and reliably, and extends the service life of the equipment.

[0042] For a preferred implementation, please refer to Figure 1 It also includes a safety light curtain 16, which is set in the operating surface area of ​​the processing table 1. The safety light curtain 16 includes a transmitter and a receiver. The transmitter is set on the processing table 1 on one side of the lower seat 3, and the receiver is set on the top of the support plate 2. The power of the equipment is immediately cut off when the user's hand enters the light curtain area.

[0043] The safety light curtain 16 continuously emits invisible light beams, forming a light curtain area on the operating surface. The receiver is responsible for receiving the light beams emitted by the transmitter. When a user's hand enters the light curtain area, it blocks part or all of the light beams. The light signal received by the receiver changes, and the receiver immediately sends a signal to the equipment's control system. Upon receiving the signal, the equipment control system immediately cuts off the equipment's power and stops its operation, preventing injury to the user's hand during operation. This effectively improves the safety of equipment operation and protects the personal safety of the operator.

[0044] In this embodiment, the following design can be implemented:

[0045] Safety light curtain 16 (model: Sick C2C series), the transmitter and receiver are connected to the built-in PLC controller (Siemens S7-1200) of the equipment control panel via shielded cables; emergency stop relay (Schneider RXM4AB2P7) is used to cut off the power to the cutting mechanism.

[0046] The control logic is as follows:

[0047] The transmitter continuously emits an infrared beam, and the receiver monitors in real time whether the beam is blocked. When a foreign object (such as a finger) blocks the beam for ≥20ms, the receiver outputs a high-level signal to the PLC's digital input module (SM1223). The PLC executes an interrupt program, which drives an emergency stop relay through the digital output module (SM1222) to cut off the power used to cut off the cutting mechanism (response time ≤50ms).

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bending and stamping die for metal pipe fittings, characterized in that, include: A processing table (1) is provided with a support plate (2) on one side of the processing table (1). The support plate (2) is designed in an inverted L-shape. A bending mechanism is provided on the processing table (1). The bending mechanism includes a lower seat (3) and an upper seat (4). The top surface of the lower seat (3) is concave, and the bottom surface of the upper seat (4) is convex. The lower seat (3) and the upper seat (4) are compatible. The top surface of the lower seat (3) is provided with a lower bending groove (7), and the bottom surface of the upper seat (4) is provided with an upper bending groove (8). The cross-sections of the lower bending groove (7) and the upper bending groove (8) are both semi-circular.

2. The bending and stamping die for a hardware pipe fitting according to claim 1, characterized in that: It also includes an ejection mechanism, which is provided on the upper seat (4). The ejection mechanism includes an ejector and a slide (10). The slide (10) is opened on the upper seat (4) and the bottom opening of the slide (10) extends through the outside of the upper seat (4). The ejection block (9) is slidably disposed inside the slide (10), and when the ejection block (9) is fully retracted into the slide (10), it forms a whole with the upper seat (4).

3. The bending and stamping die for a hardware pipe fitting according to claim 2, characterized in that: The top of the ejector block (9) is provided with a slide rod (11), and the top of the inner side of the slide groove (10) is provided with a telescopic groove (18). The upper end of the slide rod (11) is slidably inserted into the top of the inner side of the slide groove (10) and extends into the interior of the telescopic groove (18). The end of the slide rod (11) located in the telescopic groove (18) is provided with a limit block (12), and the limit block (12) and the inner wall of the telescopic groove (18) slide together.

4. The bending and stamping die for metal pipe fittings according to claim 3, characterized in that: A compression spring (13) is provided in the telescopic groove (18) between the top of the limiting block (12) and the top of the slide groove (10). When the upper seat (4) is raised and reset after the stamping and bending is completed, the ejector block (9) can eject and separate the pipe attached to the upper bending groove (8).

5. The bending and stamping die for a metal pipe fitting according to claim 2, characterized in that: The upper ends of the outer walls on both sides of the ejector block (9) are provided with guide blocks (14), and the inner walls on both sides of the slide groove (10) are provided with guide grooves (15). The guide blocks (14) and guide grooves (15) are adapted to each other, and when the guide blocks (14) slide to the bottom of the guide groove (15), they can limit the ejector block (9) to prevent the ejector block (9) from leaving the slide groove (10).

6. The bending and stamping die for a metal pipe fitting according to claim 1, characterized in that: It also includes a safety light curtain (16) set in the operating area of ​​the processing table (1). The safety light curtain (16) includes a transmitter and a receiver. The transmitter is set on the processing table (1) on one side of the lower seat (3), and the receiver is set on the top of the support plate (2). The power of the equipment is immediately cut off when the user's hand enters the light curtain area.

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