CN106944570B

CN106944570B - Twisted heat exchange tube manufacturing device

Info

Publication number: CN106944570B
Application number: CN201710324405.4A
Authority: CN
Inventors: 朱大胜; 李修珍; 杨会超; 张文全; 刘友英
Original assignee: Nanjing Institute of Technology
Current assignee: Nanjing Institute of Technology
Priority date: 2017-05-10
Filing date: 2017-05-10
Publication date: 2021-06-25
Anticipated expiration: 2037-05-10
Also published as: CN106944570A

Abstract

The invention relates to a manufacturing device of a twisted heat exchange tube, which comprises a machine tool body, a gear, a die, a chuck jaw, a transmission shaft, a gear box, a pneumatic clamping and feeding device and a workpiece support, wherein the gear, the die, the chuck jaw, the transmission shaft, the gear box, the pneumatic clamping and feeding device and the workpiece support are arranged on the machine tool body; the gear is positioned on the excircle of the lathe chuck and is meshed with a gear shaft at the end of a transmission shaft, the transmission shaft is connected with a gearbox, the pneumatic clamping and feeding device is positioned on the gearbox, and the die is positioned on a jaw of the lathe chuck; the bracket is provided with a roller and a locking handle. The invention is formed by modifying a common lathe, has simple structure, convenient adjustment, higher stability, high yield and low cost, and can process pipes with different pitches, different diameters and longer length.

Description

Twisted heat exchange tube manufacturing device

Technical Field

The invention relates to a manufacturing device of a twisted heat exchange tube, in particular to a manufacturing device of a twisted heat exchange tube modified by a common lathe.

Background

The spiral flat pipe is used as a heat transfer element of the heat exchanger, and the spiral flat pipe is designed and manufactured, and is one of the most important achievements in the field of heat exchangers in the twentieth century. The spiral flat tube heat exchanger has the advantages that: the pressure drop is small, the heat transfer efficiency is high, scaling is not easy to occur, no flow dead zone exists, blocking is avoided, induced vibration can be overcome, the reliability is improved, and the like.

At present, the manufacturing devices of the twisted heat exchange tube used on the heat exchanger equipment are numerous: chinese patent publication No. CN2568326 discloses a "spiral flat tube forming device", which rolls a traveling round tube by using a stack of rollers having non-parallel axes and concave curved surfaces corresponding to the curvature radius of the flat tube, and a support and a clamp thereon can move during processing, and this method processes a long flat tube, and the stress is concentrated on the drive clamp part, which easily causes the spiral pitch to be different from other parts; chinese patent publication No. CN101224475A discloses a "cold press molding machine for spiral flat tubes", which utilizes a fixed spiral flat tube mold and a movable spiral flat tube mold for cold press molding the spiral flat tubes to complete cold press molding of high-quality and uniform-pitch spiral flat tubes with equal length to the molds by one-time mold closing and mold opening of the movable and fixed spiral flat tube molds, and the method has the problems that after cold press molding, the movable and fixed molds are difficult to open, and the method requires higher requirements for processing precision of spiral tube cavities; chinese patent publication No. CN102626734A discloses a "spiral flat tube rolling forming machine for heat exchange equipment", the meshing degree of the drive gear coaxial with the gyro wheel in its material feeding unit when processing the pipe of different diameters is different, if the diameter is a little bigger can not mesh, can only unilateral pay-off, pay-off efficiency reduces, the power of using hydraulic means to carry is invariable, the fragile pipe bears huge moment of torsion at the rotatory in-process pipe of mould, the easy emergence is followed and is changeed between the gyro wheel, influence heat exchange tube shaping efficiency.

Disclosure of Invention

In order to solve the technical problems, the invention discloses a device for manufacturing a twisted heat exchange tube, which can be modified by a common lathe, and is additionally provided with a gear, a transmission shaft, an air pressure clamping and feeding device and other mechanisms on the basis of the common lathe, so that the device is simple in structure, easy to realize, convenient to adjust, provided with an overload protection mechanism, stable in continuous processing, and capable of processing tubes with different pitches, different diameters and longer distances, and is a device for processing the twisted heat exchange tube, wherein the processing length is not limited by the length of the lathe, the processing is convenient, the yield is high, and the cost is low.

The specific technical scheme of the invention is as follows:

a distorted heat exchange tube manufacturing device is formed by modifying a common lathe and comprises a lathe bed and a gear arranged on the lathe bed, a chuck jaw, a mold, a transmission shaft, a pneumatic clamping feeding device, a gearbox and a workpiece support, wherein a guide post, a sliding plate, a pneumatic cylinder, a fixed plate, a gear transmission pair, an upper clamp and a lower clamp are arranged on the pneumatic clamping feeding device, the upper clamp and the lower clamp are composed of a roller, a roller shaft, a bearing and a support, the gear is positioned on the excircle of the lathe chuck and meshed with a gear shaft at the end of the transmission shaft, the transmission shaft is connected with the gearbox, the pneumatic clamping feeding device is positioned on the gearbox, an overload protection mechanism arranged on the chuck jaw is composed of a bolt, a reset nut, a reset spring, a clamping nut, a screw rod and a clamping.

The lathe chuck is further improved into two jaws which are 180-degree symmetrical, and the die is positioned on the jaws.

In the further improvement of the invention, the gear is positioned at the outer circle of the chuck and is meshed with the gear at the end of the transmission shaft.

The invention is further improved, the outer ring of the roller is provided with a rubber ring, so that the clamping degree is improved, and the pipe is prevented from rotating along with the roller.

The invention is further improved, the number of the supports is two, and the centering reliability is improved.

In the technical scheme, the motor of the lathe drives the chuck to rotate, the upper clamp and the lower clamp are enabled to clamp the pipe through the operation of the pneumatic cylinder, the gear on the excircle of the chuck is meshed with the gear on the transmission shaft to drive the transmission shaft to rotate, power is transmitted into the gearbox through the transmission shaft, and the flattening wheel shaft is driven to rotate after the gearbox changes speed for multiple times, so that feeding is completed while the mold rotates.

Furthermore, the jaw overload protection mechanism controls the clamping degree of the clamping ring and the roller guide column by adjusting the clamping nut to compress the clamping spring, controls the overload critical value by using static friction force, moves the die up integrally after overload, and adjusts the reset nut to compress the reset spring to realize resetting the die; the bolt can adjust the reset precision of the reset mechanism and the recovery amount of the die after being stressed and overloaded; the lathe chuck is modified into two jaws which are symmetrical by 180 degrees, and the die is positioned on the jaws, so that the self-centering positioning of the machining is realized; the gear is positioned at the outer circle of the chuck and is meshed with the gear at the end of the transmission shaft; the pneumatic cylinder provides pressure to realize clamping of an upper clamp and a lower clamp of the feeding device; the gear transmission pair utilizes two additional identical gears to complete the equidirectional rotation between the first gear and the tail gear, thereby realizing the feeding of pipes with different diameters under the condition of unchanged gear transmission efficiency; the outer ring of the roller is provided with a rubber ring, so that the clamping degree is improved, and the follow-up rotation of the pipe is prevented; the rotating speed of the power input shaft of the roller can be controlled through the gearbox, so that the feeding speed of the pneumatic clamping feeding device is controlled, and the processing of the twisted heat exchange tubes with different pitches is realized; the support is used for supporting the overlength pipe to the stability that the pipe drew ground overlength influence pay-off, and the gyro wheel on the support is arc, and the support can be followed the guide rail and can be locked on the guide rail, and support 8 has two, improves the reliability of centering.

The invention has the beneficial effects that: the pipe clamping device is formed by modifying a common lathe, only a gear, a transmission shaft and a hydraulic clamping and feeding device need to be added on the basis of the common lathe, the structure is simple, the realization is easy, the adjustment is convenient, and pipes with longer distance can be processed; the invention adjusts the rotating speed of the input shaft of the feeding device through the gearbox, and forms different rotating speed ratios with the rotating speed of the chuck, so that the chuck has different feeding speeds while rotating fixedly, the processing of various twisted heat exchange tubes with different pitches is realized, the operation is simple and convenient, and any part does not need to be replaced; the self-centering clamping of the die and the action of the gear outside the feeding mechanism are adopted, and the feeding device adopts the transmission of the gear pair outside, so that the transmission gear can still be meshed and stably transmitted under the condition that the distances between the upper clamp and the lower clamp are different, and the pipes with different diameters can be conveyed under the condition that the conveying rate is stable; the invention has the advantages of no limit of the length of the lathe on the processing length, convenient processing, high yield and low cost; according to the invention, by applying the static friction force of the clamping ring and the die support, the pipe is effectively prevented from being damaged due to overlarge pressure of the die on the pipe in the machining process, and the integrity of a workpiece is improved; the upper clamp and the lower clamp are controlled by the pneumatic cylinder, so that the control is accurate, the damage to a pipe due to too large clamping force can be prevented to a certain extent, and the processing efficiency and the stability can be improved; according to the invention, the accuracy and stability of the processing of the twisted heat exchange tube are improved through self-centering of the chuck jaws, centering of the feeding device and centering of the arc roller of the bracket; the lathe motor drives the chuck gear to rotate and simultaneously drives the air pressure clamping feeding device to synchronously move, so that the lathe motor has higher stability.

Drawings

Fig. 1 is a schematic view of the overall construction of a device for manufacturing a twisted heat exchange tube according to the present invention.

FIG. 2 is a schematic view of the roller feeder and a plan view of a gear pair of the present invention.

Fig. 3 is a partial enlarged view G in fig. 1.

Fig. 4 is a view a-a and a view B-B of fig. 1.

FIG. 5 is a schematic view of a work support of the present invention.

In the figure, 1-machine tool body, 2-gear, 3-chuck jaw, 4-die, 5-transmission shaft, 6-feeding device, 7-gear box, 8-workpiece support, 9-guide column, 10-sliding plate, 11-pneumatic cylinder, 12-fixing plate, 13-roller, 14, 15-roller shaft, 16-gear transmission pair, 17-upper clamp, 18-lower clamp, 19-bolt, 20-reset nut, 21-reset spring, 22-clamping spring, 23-clamping nut, 24-screw rod, 25-clamping ring, 26-locking handle and 27-roller.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1-5, a device for manufacturing a twisted heat exchange tube is formed by modifying a common lathe, and comprises a lathe bed 1, a gear 2, a chuck jaw 3, a die 4, a transmission shaft 5, a gearbox 7, an air pressure clamping and feeding device 6 and a workpiece support 8, wherein the gear 2, the chuck jaw 3, the die, the transmission shaft 5, the gearbox 7, the air pressure clamping and feeding device 6 and the workpiece support are arranged on the lathe bed, and the device is characterized in that the air pressure clamping and feeding device is provided with a guide column 9, a sliding plate 10, an air pressure cylinder 11, a fixed plate 12, a gear transmission pair 16, an upper clamp 17 and; the gear 2 is positioned on the excircle of the lathe chuck and is meshed with a gear shaft at the end of a transmission shaft, the transmission shaft 5 is connected with a gearbox 7, and a pneumatic clamping feeding device 6 is positioned on the gearbox 7, as shown in figure 1.

The mold 4 is arranged on the chuck jaw 3, the clamping ring 25 clamps the roller guide column to fix the mold, the clamping degree of the clamping ring 25 and the roller guide column is controlled by the clamping spring 22 and the clamping nut 23 on the clamping ring, and when the force in the processing process is greater than the static friction force of the clamping ring and the roller guide column, the roller guide column moves upwards, so that the workpiece is prevented from being extruded and damaged; the top end of the roller guide post contacts with a return spring 21, the die can be reset by adjusting a return nut, meanwhile, the elastic force of the return spring 21 is used, a bolt 19 at the top is used for adjusting the reset precision and compensating errors caused by plastic deformation of the return spring 21, as shown in fig. 4, and a partial enlarged view of the die and an overload protection mechanism is shown in fig. 3.

One end of a transmission shaft 5 is fixed in a gearbox 7, the other end of the transmission shaft is fixed on a lathe body through screw connection, and gears are arranged at two ends of the transmission shaft and used for transmitting power, as shown in figure 1; the bull gear is located lathe chuck excircle, and is as an organic whole with the chuck processing, and the bull gear meshes with the pinion of transmission shaft one end.

The pneumatic clamping feeding device 6 is characterized in that a lower clamp 18 consists of an input roller shaft 15, a bearing seat and a roller 13; the upper clamp 17 is composed of a driven roller shaft 14, a bearing seat and a roller, the lower clamp 18 is fixed, and the upper clamp 17 can move up and down along with the sliding plate 10; the pneumatic cylinder 11 is used to control the up and down movement of the sliding plate 10, thereby controlling the distance between the upper jig 17 and the lower jig 18 to adjust the roller gap; the gear transmission mechanisms are arranged on the roller shafts, two same gears are additionally arranged, and the gears are fixed by a connecting rod to ensure meshing, so that synchronous transmission is ensured while the distance between the rollers is controlled; the pneumatic cylinder 11 drives the slide plate to move downwards 10, the die clamps the pipe, the power is transmitted to the input shaft 15 through the gearbox 7, and the rollers rotate to drive the pipe to move towards the die, as shown in fig. 2.

The workpiece support 8 is arranged behind the pneumatic clamping feeding device 6, and when a long pipe is processed, the workpiece support 8 can be fixed at a proper position of a lathe guide rail by adjusting a locking handle 26 on the workpiece, as shown in fig. 5.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The device for manufacturing the twisted heat exchange tube is characterized by comprising a machine tool body, and a gear, a chuck jaw, a die, a transmission shaft, a pneumatic clamping feeding device, a gearbox and a workpiece support which are arranged on the machine tool body, wherein the pneumatic clamping feeding device is provided with a guide post, a sliding plate, a pneumatic cylinder, a fixed plate, a gear transmission pair, an upper clamp and a lower clamp, the upper clamp and the lower clamp consist of a roller, a roller shaft, a bearing and a support, the gear is positioned on the excircle of the lathe chuck and meshed with a gear shaft at the end of the transmission shaft, the transmission shaft is connected with the gearbox, the pneumatic clamping feeding device is positioned on the gearbox, the chuck jaw is provided with an overload protection mechanism consisting of a bolt, a reset nut, a reset spring, a clamping nut, a lead screw and a clamping ring, the workpiece, The lathe chuck is changed into two jaws, the two jaws are symmetrical at 180 degrees, the mold is positioned on the jaw, the gear is positioned at the excircle of the chuck and is meshed with a gear at the end of a transmission shaft, the clamping ring clamps the roller guide post so as to fix the mold, the clamping degree of the clamping ring and the roller guide post is controlled by the clamping spring and the clamping nut on the clamping ring, and when the force in the machining process is greater than the static friction force of the clamping ring and the roller guide post, the roller guide post moves upwards, so that the workpiece is prevented from being extruded and damaged; the top end of the roller guide post is contacted with a reset spring, the die can be reset by adjusting a reset nut, meanwhile, the elasticity of the reset spring is used, the bolt at the top is used for adjusting the reset precision and compensating errors caused by plastic deformation of the reset spring, and the upper clamp can move up and down along with the sliding plate; the pneumatic cylinder is used for controlling the up-and-down movement of the sliding plate, so as to control the distance between the upper clamp and the lower clamp and adjust the gap of the roller; the gear transmission mechanisms are arranged on the roller shafts, two same gears are additionally arranged, the gears are fixed by a connecting rod to ensure meshing, and synchronous transmission is ensured while the distance between the rollers is controlled.

2. The apparatus for manufacturing a twisted heat exchanger tube as claimed in claim 1, wherein the outer circumference of the roller has a rubber ring.

3. The twisted heat exchanger tube manufacturing apparatus as claimed in claim 2, wherein the number of the brackets is two.