A multi-stage throttle-reducing pipe drawing forming device

Abstract

The utility model discloses a kind of multistage throttling reducing pipe drawing forming device, including workbench, driving device, its characterized in that one end is equipped with drawing die holder on workbench, tailstock is equipped with on the other end of workbench, drawing die holder and tailstock are connected with parallelly arranged transmission screw rod and linear guide, and mobile clamping mould is equipped with in cooperation with transmission screw rod, linear guide;Mobile clamping mould is equipped with several telescopic clamps by cylinder drive, drawing die is equipped in drawing die holder, and drawing die is one-to-one corresponding with telescopic clamps.Can realize the multistage synchronous reducing drawing of pipe material, significantly improve tensile efficiency;Ensure centring and stability in clamping process, avoid pipe material deviation, realize accurate clamping and positioning, save material cost;Convenient to replace and maintain, adapt to the processing demand of different specifications pipe material;Realize accurate control of drawing process, improve processing precision and consistency.

Description

Technical Field

[0001] This utility model relates to the technical field of metal pipe processing equipment, specifically to a multi-stage throttling and diameter-reducing pipe drawing and forming device, which is suitable for multi-stage diameter-reducing drawing and forming of metal pipes. Background Technology

[0002] The reduction of copper and aluminum tube diameters, combined with capillary tubes, forms a "multi-stage throttling" system, precisely controlling the refrigerant flow and pressure to ensure full evaporation and heat absorption in the evaporator. Simultaneously, tube diameter reduction optimizes piping layout and solves component replacement issues during maintenance, making it a crucial element in balancing throttling efficiency and system compatibility in refrigerator refrigeration systems. Traditional tube diameter reduction drawing equipment typically employs a single-stage drawing method, resulting in low efficiency and difficulty in guaranteeing the accuracy and consistency of multi-stage reduction. It often uses hydraulic stations to meet length requirements, leading to slow drawing speeds and potential overheating in summer, causing operational failures. During tube end clamping, manual adjustment screws are used to fix the traction end, requiring multiple adjustments for different tube specifications to achieve proper positioning. This demands a high level of operator skill and can easily lead to material waste and poor stability. Furthermore, existing equipment often suffers from insufficient clamping force or inaccurate positioning, causing the tube to slip or shift during drawing, thus affecting processing quality. Therefore, a forming device capable of achieving efficient and precise multi-stage diameter reduction drawing is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by providing a multi-stage throttling and reducing pipe drawing and forming device. Through optimized structural design, accurate positioning at a fixed length, and stable clamping, it achieves multi-stage synchronous drawing of pipes, thereby improving processing efficiency and forming accuracy.

[0004] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a multi-stage throttling and reducing tube drawing forming device, including a worktable and a driving device, characterized in that a drawing die seat is provided at one end of the worktable and a tail seat is provided at the other end of the worktable, a parallel transmission screw and a linear guide are connected between the drawing die seat and the tail seat, and a movable clamping die is provided in cooperation with the transmission screw and the linear guide; the movable clamping die is provided with a plurality of telescopic clamps driven by cylinders, and the drawing die seat is provided with drawing dies corresponding one-to-one with the telescopic clamps.

[0005] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the movable clamping mold includes a base plate, a clamping mold seat is provided on the base plate, a conical groove is provided in the clamping mold seat, and the telescopic clamp slides in the conical groove; the tail of the telescopic clamp is connected to the cylinder piston rod.

[0006] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the bottom of the base plate of the movable clamping mold is provided with a drive nut that is threadedly engaged with the transmission screw, and a linear slider that is slidably engaged with the linear guide rail.

[0007] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the telescopic clamp is provided with a groove at its tail, and the piston rod of the cylinder cooperates with the groove through a puller block to drive the telescopic clamp.

[0008] In the aforementioned multi-stage throttling and diameter-reducing tube drawing and forming device, preferably, the top of the conical groove of the clamping mold base is provided with a limiting plate to restrict the vertical freedom of the telescopic clamp.

[0009] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the telescopic clamp consists of two symmetrically arranged single molds, and friction teeth are provided on the opposing clamping surfaces of the two single molds.

[0010] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the drawing die is detachably assembled in the drawing die base, and the drawing die base is provided with a column head bolt, and the drawing die is provided with a countersunk hole that mates with the end of the column head bolt.

[0011] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the worktable is provided with a limit switch, and the movable clamping mold is provided with a contact plate that cooperates with the limit switch.

[0012] In the aforementioned multi-stage throttling and reducing tube drawing and forming device, preferably, the tail end of the transmission screw passes through the tailstock and cooperates with the drive device; the drive device includes a servo motor, which drives the transmission screw through a synchronous belt and a transmission wheel.

[0013] In the aforementioned multi-stage throttling and reducing tube drawing forming device, preferably, the workbench is also provided with an operation panel, which includes a display screen and control switches.

[0014] This technical solution replaces the traditional hydraulic cylinder stretching method with a servo motor and lead screw drive, achieving a dimensional accuracy of ±0.01mm. The drawing station allows for multi-stage synchronous diameter reduction drawing of the tube, significantly improving processing efficiency. The device uses a cylinder to drive a telescopic clamp within a conical groove, clamping or releasing the tube with precise positioning and stable, reliable operation. The rotational motion of the lead screw is converted into linear motion of the moving clamping die via a drive nut, while a linear guide ensures the stability of the moving clamping die's movement. A limit plate integrated with the clamping die base is located at the top of the conical groove, restricting the vertical freedom of the telescopic clamp and ensuring stable and precise alignment during clamping. Friction teeth on the opposing clamping surfaces of the two clamping dies greatly enhance the clamping force on the tube, preventing slippage. The moving clamping die, in conjunction with a limit switch, directly controls the stroke range of the moving clamping die, preventing overtravel damage to the product and equipment. The servo motor drives the lead screw via a synchronous belt and transmission wheel, achieving high-precision, speed-adjustable drawing motion. The operation panel features a display screen, touch-sensitive buttons, and control buttons, allowing operators to monitor and adjust equipment operating parameters in real time, making the working parameters clear at a glance.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting multiple drawing dies and corresponding telescopic clamps, multi-stage synchronous diameter reduction drawing of pipes can be achieved, significantly improving the drawing efficiency; the telescopic clamp adopts a conical groove and limit plate design to ensure centering and stability during the clamping process, avoid pipe offset, achieve precise clamping and positioning, and save material costs; both the drawing die and the telescopic clamp are detachable structures, which are convenient for replacement and maintenance and can adapt to the processing needs of pipes of different specifications; through the cooperation of servo motor drive and limit switch, precise control of the drawing process is achieved, improving processing accuracy and consistency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 yes Figure 1 Top view (without the operation panel).

[0018] Figure 3 This is a partially enlarged structural diagram of a movable clamping mold part of this utility model.

[0019] Figure 4 This is a schematic diagram of the clamp mold base and telescopic clamp in the mating state of this utility model.

[0020] Figure 5 This is a schematic diagram of the assembly relationship between the drawing die holder and the drawing die of this utility model.

[0021] Figure 6 , Figure 7These are schematic diagrams of the workpiece before and after being drawn.

[0022] Figure 8 This is a control circuit diagram of this utility model.

[0023] In the diagram: 1-Workbench, 2-Pulling die holder, 201-Pulling die, 3-Operating panel, 4-Tailstock, 5-Moving clamping die, 501-Base plate, 502-Clamping die holder, 503-Telescopic clamp, 504-Cylinder, 505-Cylinder seat plate, 506-Pulling block, 507-Limiting plate, 6-Transmission screw, 7-Linear guide rail, 8-Workpiece, 9-Limit switch, 10-Drive device. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0025] like Figure 1 , Figure 2 As shown in the figure, this embodiment discloses a multi-stage throttling and reducing tube drawing forming device. It includes a rectangular worktable 1 with a central partition along its height, serving as both a platform for mounting the drive device 10 and a reinforcing rib to strengthen the overall worktable. A drawing die holder 2 is located at one end of the worktable 1, and a tailstock 4 is located at the other end. A ball-bearing drive screw 6 and two linear guides 7 are connected in parallel between the drawing die holder 2 and the tailstock 4, with the drive screw 6 located in the middle and the two linear guides 7 symmetrically arranged on either side of the drive screw 6. Bearings are provided in both the drawing die holder 2 and the tailstock 4. Both ends of the drive screw 6 are positioned within the bearings, and one end of the drive screw 6 passes through the tailstock 4 and is equipped with a drive wheel, which engages with the drive device 10. The drive device includes a servo motor and a drive wheel, which is connected to the drive wheel via a synchronous belt, thereby driving the drive screw. Both ends of the linear guides 7 are directly fixed in the drawing die holder 2 and the tailstock 4.

[0026] A movable clamping mold 5 is provided in conjunction with the transmission lead screw 6 and the linear guide rail 7. The movable clamping mold 5 is equipped with two telescopic clamps 503 driven by cylinders 504, such as... Figure 3 As shown, the drawing die holder 2 is provided with drawing dies 201 that correspond one-to-one with the telescopic clamp 503, such as... Figure 5 As shown.

[0027] The movable clamping mold 5 includes a base plate 501, the bottom of which is provided with a ball nut that cooperates with the transmission screw 6, and a linear slider that slides with the linear guide rail 7.

[0028] The base plate 501 is provided with a fixture mold base 502, which has two conical grooves. See below. Figure 4The telescopic clamp 503 slides within a conical groove. The tail of the telescopic clamp 503 is connected to the piston rod of the cylinder 504. Specifically, the tail of the telescopic clamp 503 has a recessed groove, and a puller block 506 is fixed to the end of the piston rod of the cylinder 504. The puller block 506 is inserted into the recessed groove, causing it to move in conjunction with the telescopic clamp 503, thereby driving the telescopic clamp. The telescopic clamp 503 consists of two symmetrically arranged single molds, each with friction teeth on its opposing clamping surfaces. A limiting plate 507, integrally formed with the clamp mold base 502, is provided at the top of the conical groove of the clamp mold base 502. The limiting plate 507 is specifically designed to restrict the vertical freedom of the telescopic clamp 503.

[0029] It is worth mentioning that the part of the workpiece 8 pipe that has been clamped by the telescopic clamp 503 will inevitably deform, and the deformed part needs to be sawed off after completion. The length of the telescopic clamp 503 extending out of the conical groove of the clamping mold base 502 is part of the pre-reduced section length of the workpiece 8 pipe. This part of the length can be adjusted according to the specifications of the workpiece 8 pipe and the force required during drawing to obtain the shortest clamping amount. Therefore, by controlling the length of the telescopic clamp 503 extending out of the conical groove, the clamping amount (reduced length) can be controlled, thereby reducing the required reduced length and saving materials.

[0030] Furthermore, the conical groove in the fixture mold base 502 is a through groove, see also... Figure 4 The fixture mold base 502 has a groove at one end facing the cylinder 504. The cylinder seat plate 505 is installed using this groove, and the cylinder 504 is fixed on the cylinder seat plate 505.

[0031] The drawing die 201 is detachably assembled in the drawing die base 2, and the drawing die base is provided with a stud bolt. The drawing die is provided with a countersunk hole that mates with the end of the stud bolt, so as to realize the replacement of the drawing die 201. Generally, the hole in the drawing die base 2 used to position the drawing die 201 is set as constant, that is, a fixed size, and the inner hole size can be changed only for different specifications of workpieces 8 tubes.

[0032] The workbench 1 is equipped with two limit switches 9, one for the starting position and one for the ending position. The movable clamping mold 5 is equipped with a contact plate that cooperates with the limit switches 9. The workbench 1 is also equipped with an operation panel 3, and a foot switch is provided at the operating position for convenient operation while seated. The operation panel includes a display screen and control switches. The display screen is an HMI touch screen, and the workpiece model can be changed directly through the touch screen to save debugging time and reduce waste.

[0033] Working principle and application:

[0034] Combination Figure 6 , Figure 7 The diagram shows the structural shapes of the 8 tubes before and after forming, along with related information. Figure 8The control circuit diagram shows that the device's workflow is controlled by a PLC and a touch screen. The length and workpiece processing speed are set through programming.

[0035] Select and assemble the drawing die 201 according to the specifications of the workpiece 8. Start the return-to-origin switch on the operation panel 3, start the drive device 10, and turn on the working mode of the cylinder 504. When the moving clamping die 5 moves to the position that matches the drawing die base 2, and the pre-shrink end of the workpiece 8 is inserted into the drawing die 201, start the foot switch to cause the clamping cylinder to drive the telescopic clamp 503 to extend, and the workpiece 8 is clamped. The drive device 10 drives the transmission screw 6 to rotate, and the moving clamping die 5 moves away from the drawing die base 2. The workpiece 8 is drawn and shrunk to the length setting position. The moving clamping die 5 stops drawing and returns to the position that matches the drawing die base 2. The clamping cylinder drives the telescopic clamp 503 to retract, the workpiece 8 is unloaded, and the workpiece is reloaded. Start the foot switch, and the cycle continues.

[0036] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any equivalent changes or modifications made in accordance with the technical concept proposed by the present invention without departing from the principles of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A multi-stage throttling and reducing tube drawing and forming device, comprising a worktable (1) and a driving device (10), characterized in that, in One end of the workbench is provided with a drawing die seat (2), and the other end of the workbench is provided with a tailstock (4). A parallel transmission screw (6) and a linear guide rail (7) are connected between the drawing die seat and the tailstock. A movable clamping die (5) is provided in cooperation with the transmission screw and the linear guide rail. The movable clamping die is provided with several telescopic clamps (503) driven by cylinders (504). The drawing die seat is provided with drawing dies (201) that correspond one-to-one with the telescopic clamps.

2. The multi-stage throttling and reducing tube drawing and forming device according to claim 1, characterized in that, The movable clamping mold (5) includes a base plate (501), a clamping mold base (502) is provided on the base plate (501), a conical groove is provided in the clamping mold base, and the telescopic clamp (503) slides in the conical groove; the tail of the telescopic clamp is connected to the piston rod of the cylinder (504).

3. The multi-stage throttling and reducing tube drawing and forming device according to claim 2, characterized in that, The bottom of the base plate of the movable clamping mold (5) is provided with a drive nut that is threadedly engaged with the transmission screw (6) and a linear slider that is slidably engaged with the linear guide rail (7).

4. The multi-stage throttling and reducing tube drawing and forming device according to claim 2, characterized in that, The telescopic clamp (503) has a sink groove at its tail. The piston rod of the cylinder (504) cooperates with the sink groove through the pull block (506) to drive the telescopic clamp.

5. A multi-stage throttling and reducing tube drawing and forming device according to claim 2 or 4, characterized in that, The top of the tapered groove of the clamp mold base (502) is provided with a limiting plate (507) to limit the vertical freedom of the telescopic clamp (503).

6. A multi-stage throttling and reducing tube drawing and forming device according to claim 1, 2, or 4, characterized in that, The telescopic clamp (503) consists of two symmetrically arranged single molds, and friction teeth are provided on the opposite clamping surfaces of the two single molds.

7. The multi-stage throttling and reducing tube drawing and forming device according to claim 1, characterized in that, The drawing die (201) is detachably assembled in the drawing die base (2), and the drawing die base is provided with a column head bolt, and the drawing die is provided with a countersunk hole that mates with the end of the column head bolt.

8. The multi-stage throttling and reducing tube drawing and forming device according to claim 1, characterized in that, The workbench (1) is equipped with a limit switch (9), and the movable clamping mold (5) is equipped with a contact plate that cooperates with the limit switch.

9. A multi-stage throttling and reducing tube drawing and forming device according to claim 1 or 8, characterized in that, The tail of the transmission screw (6) passes through the tailstock (4) and engages with the drive device (10); the drive device includes a servo motor, which drives the transmission screw through a synchronous belt and a transmission wheel.

10. A multi-stage throttling and reducing tube drawing and forming device according to claim 1 or 8, characterized in that, The workbench (1) is also equipped with an operation panel (3), which includes a display screen and control switches.

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