High-precision cold-drawing forming and gradient heat treatment integrated equipment for piano steel wire

Abstract

The invention relates to high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano steel wires, and belongs to the technical field of piano steel wire machining equipment. Comprising a first mounting seat and a second mounting seat which are symmetrically arranged, a plurality of groups of first drawing modules are arranged at the top of the first mounting seat and used for guiding and drawing the piano steel wire for the first time, and a plurality of groups of second drawing modules are arranged at the top of the second mounting seat and used for guiding and drawing the piano steel wire for the second time. According to the invention, equipment in annular layout is adopted, so that the occupied area is small, the whole equipment can be better controlled, and meanwhile, through layout cooperation among all the chambers, the antifouling of inert gas in the heating cavity and the slow cooling cavity can be realized by utilizing pressure difference. And through cyclic utilization of the inert gas in the aerial fog, the pressure maintaining effect on the heating cavity and the slow cooling cavity can be achieved, the usage amount of the inert gas can be reduced, the production cost can be reduced, and meanwhile the effects of preheating the piano steel wire and improving the heating efficiency can be achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of string wire processing equipment, and relates to a string wire high-precision cold-drawing forming and gradient heat treatment integrated equipment. BACKGROUND

[0002] String wire is also called string wire, which is a high-carbon steel material. The processing flow of string wire generally includes the following steps: raw material selection (high-carbon steel), wire drawing (multi-pass drawing, intermediate annealing), heat treatment (quenching, tempering), surface treatment (plating, coating), straightening, cutting, quality detection (diameter, strength, fatigue test, pitch test) and the like. String wire has the characteristics of high carbon content, good hardness and good elasticity, and is suitable for making various pressure, tension and torsion springs, and is widely used in automobile manufacturing, electrical production equipment, nuclear power, metal products, precision electronic instruments and chemical equipment industries, and the precision of its process provides a reliable material basis for many industries.

[0003] Intermediate annealing is an important step in the cold drawing process, which is used to eliminate work hardening, restore the ductility of the material and avoid brittle fracture to continue processing. Intermediate annealing is usually performed between multiple drawing processes and is used when the material becomes too hard or cracks due to cold working. The traditional wire drawing process and intermediate annealing process are generally linearly arranged, and the string wire is drawn in a straight line and then the annealing process is added in the multi-pass drawing process. The traditional mode leads to a too long process chain, and the equipment occupies a strip-shaped layout, which is not only troublesome to operate back and forth, not easy to produce and control, but also occupies a large area, which is not convenient for site use. In addition, in the continuous wire drawing and annealing operation, the traditional linear processing is not easy to operate in cooperation between processes, not only high in energy consumption, but also large in inert gas consumption, resulting in high cost. Therefore, the present application provides a string wire high-precision cold-drawing forming and gradient heat treatment integrated equipment to solve the above problems. SUMMARY

[0004] Therefore, the present application provides a string wire high-precision cold-drawing forming and gradient heat treatment integrated equipment to solve the above problems.

[0005] To achieve the above purpose, the present application provides the following technical solution: a first mounting seat and a second mounting seat are symmetrically arranged; A plurality of first drawing modules are arranged on the top of the first mounting seat and used for guiding the first pass of string wire drawing. A plurality of second drawing die sets are arranged on the top of the second mounting seat and used for guiding and drawing the second pass of the piano wire; The heat treatment seat is fixed between the first mounting seat and the second mounting seat and forms an integrated device, the inside of the heat treatment seat is respectively provided with a preheating cavity, a heating cavity, a slow cooling cavity and a cooling cavity, the piano wire enters the inside of the heat treatment seat after the first pass of drawing, and then sequentially passes through the preheating cavity, the heating cavity, the slow cooling cavity and the cooling cavity to complete gradient heat treatment, so that the strength of the piano wire is improved, the ductility of the material is restored, and then the second pass of drawing operation is performed to avoid brittle fracture; A plurality of traction guide wheels are arranged in the inside of the preheating cavity, the heating cavity, the slow cooling cavity and the cooling cavity and used for traction and guidance of the piano wire in the heat treatment process; A plurality of electric heating pipes are arranged in the inside of the heating cavity and used for heating and warming the piano wire. A cooling member is arranged in the inside of the cooling cavity and used for cooling and cooling the piano wire.

[0006] Further, the first mounting seat and the second mounting seat are arc-shaped seats, the heat treatment seat is a circular seat, the first mounting seat and the second mounting seat are fixed in a ring-shaped surrounding manner on the outer wall of the heat treatment seat, one side of the first mounting seat and the second mounting seat is in contact, and the other side has a gap reserved in the middle, and a PLC control cabinet used for control operation of the whole device is arranged in the gap.

[0007] Further, the preheating cavity, the heating cavity, the slow cooling cavity and the cooling cavity are arranged in the inside of the heat treatment seat in a ring-shaped and end-to-end manner.

[0008] Further, the heat treatment seat is symmetrically provided with an inlet hole and an outlet hole on the side away from the PLC control cabinet, the inlet hole is in communication with the preheating cavity, and the outlet hole is in communication with the cooling cavity.

[0009] Further, the first threading hole is arranged in communication between the preheating cavity and the heating cavity, the second threading hole is arranged in communication between the heating cavity and the slow cooling cavity, and the third threading hole is arranged in communication between the slow cooling cavity and the cooling cavity.

[0010] Further, the inlet hole and the outlet hole are respectively provided with a sealing sleeve.

[0011] Further, the cooling member includes an aerosol nozzle arranged on the inner wall of the cooling cavity, a water inlet pipe is connected to the first port of the aerosol nozzle, and an air inlet pipe is connected to the second port of the aerosol nozzle.

[0012] Further, the bottom side of the heat treatment seat is provided with a water leakage pipe in communication with the cooling cavity.

[0013] Furthermore, an inert gas delivery pipe communicating with the heating chamber is provided on the top of the heat treatment seat.

[0014] Furthermore, a communicating vent hole is provided between the heating chamber and the slow cooling chamber.

[0015] Furthermore, a pressure gauge for detecting the air pressure in the heating chamber is provided on the top of the heat treatment seat.

[0016] Furthermore, a first U-shaped tube is provided on the top of the heat treatment seat, and both ends of the first U-shaped tube are respectively connected to the slow cooling chamber and the cooling chamber, and a first valve is installed on the first U-shaped tube.

[0017] Furthermore, a second U-shaped tube is provided on the top of the heat treatment seat, and both ends of the second U-shaped tube are respectively connected to the cooling chamber and the preheating chamber, and a second valve is installed on the second U-shaped tube.

[0018] Furthermore, a waste gas discharge pipe connected to the preheating chamber is provided on the top of the heat treatment seat.

[0019] Furthermore, the top of the heat treatment seat is fixedly connected to an air-water separator, the air inlet end of the air-water separator is connected to an aerosol delivery pipe, the other end of the aerosol delivery pipe is fixedly passed through the top of the heat treatment seat and is connected to the cooling chamber, and the bottom end of the aerosol delivery pipe is adjacent to the position of the third threading hole, the air outlet end of the air-water separator is connected to an exhaust pipe, the other end of the exhaust pipe is fixedly passed through the top of the heat treatment seat and is connected to the slow cooling chamber, and the water outlet end of the air-water separator is connected to a drain pipe.

[0020] Furthermore, a third U-shaped tube is provided on the top of the heat treatment seat, and both ends of the third U-shaped tube are respectively connected to the preheating chamber and the heating chamber, and a third valve is installed on the third U-shaped tube.

[0021] Furthermore, an air pump is fixedly connected to the top of the heat treatment seat, the air inlet end of the air pump is connected to an exhaust pipe, the other end of the exhaust pipe is fixedly passed through the top of the heat treatment seat and is connected to the preheating chamber, and the air outlet end of the air pump is connected to an air pipe for discharging exhaust gas.

[0022] The beneficial effects of the present invention are: The application can make close cooperation between functions by integrating the drawing process and the heat treatment process, and adopting the ring layout for the whole equipment, not only small floor area, easy to use the site, but also better control of the whole equipment, and through the layout cooperation between the chambers, the inert gas in the heating chamber and the slow cooling chamber can be prevented from being contaminated by using the pressure difference, which can protect the heat treatment environment. And in the whole process, the inert gas in the gas mist can be recycled, not only the pressure maintaining effect of the heating chamber and the slow cooling chamber can be realized, but also the use amount of the inert gas can be reduced, the production cost can be reduced, and the effect of preheating the piano steel wire and improving the heating efficiency can be realized by recycling and conveying the inert gas.

[0023] Other advantages, objects, and features of the application will be better understood from the following specification taken in conjunction with the accompanying drawings. The objects and other advantages of the application can be achieved and obtained by means of the features and combinations hereinafter more fully described. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the objects, technical solutions and advantages of the application clearer, the preferred embodiments of the application will be described in detail below with reference to the drawings, in which: Figure 1 It is a left view perspective view of the overall structure of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 2 It is a right view perspective view of the overall structure of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 3 It is a left view perspective view of the overall structure of the heat treatment seat of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 4 It is a right view perspective view of the overall structure of the heat treatment seat of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 5 It is a bottom view perspective sectional view of the overall structure of the heat treatment seat of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 6 It is a left view perspective sectional view of the overall structure of the heat treatment seat of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 7 It is a perspective view of the gas mist spray head connecting structure of the piano steel wire high-precision cold-drawing forming and gradient heat treatment integrated equipment of the application; Figure 8The figure is a whole structure top view of the piano string high-precision cold-drawing forming and gradient heat treatment integrated equipment of the present application. Figure 9 The figure is a whole structure top view of the piano string high-precision cold-drawing forming and gradient heat treatment integrated equipment of the present application.

[0025] The figure is a whole structure top view of the piano string high-precision cold-drawing forming and gradient heat treatment integrated equipment of the present application. DETAILED DESCRIPTION

[0026] The advantages and effects of the present application can be easily understood by those skilled in the art from the above description. The present application can also be implemented or applied by different specific embodiments, and the details in the description can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the figures in the following embodiments only schematically illustrate the basic concept of the present application, and the following embodiments and features in the embodiments can be combined with each other without conflict. EMBODIMENT

[0027] As Figures 1-9As shown, a high-precision cold drawing forming and gradient heat treatment integrated equipment for piano wire, comprising a heat treatment seat 1, a first mounting seat 2, a plurality of first drawing module groups 4, a second mounting seat 5, a plurality of second drawing module groups 6, the first mounting seat 2 and the second mounting seat 5 are symmetrically arranged, the plurality of first drawing module groups 4 are arranged on the top of the first mounting seat 2, used for guiding the first drawing of the piano wire, the plurality of second drawing module groups 6 are arranged on the top of the second mounting seat 5, used for guiding the second drawing of the piano wire, the heat treatment seat 1 is fixedly arranged between the first mounting seat 2 and the second mounting seat 5, forming an integrated equipment, the inside of the heat treatment seat 1 is respectively provided with a preheating cavity 7, a heating cavity 8, a slow cooling cavity 9 and a cooling cavity 10, the piano wire enters the inside of the heat treatment seat 1 after the first drawing process, and then sequentially passes through the preheating cavity 7, the heating cavity 8, the slow cooling cavity 9 and the cooling cavity 10 to complete the gradient heat treatment, improve the strength of the piano wire, and restore the ductility of the material, and finally the second drawing process is carried out to avoid brittle fracture. The inside of the preheating cavity 7, the heating cavity 8, the slow cooling cavity 9 and the cooling cavity 10 is provided with a group of traction guide wheels 13 for guiding the traction of the piano wire during the heat treatment process. A plurality of electric heating pipes 15 are uniformly arranged in the inside of the heating cavity 8 for heating the piano wire, and a cooling member is arranged in the inside of the cooling cavity 10, and at least one group is arranged for cooling the piano wire.

[0028] In one aspect of the embodiment, the first mounting seat 2 and the second mounting seat 5 are arc-shaped seats, the heat treatment seat 1 is a circular seat, the first mounting seat 2 and the second mounting seat 5 are fixed on the outer wall of the heat treatment seat 1 in a ring-shaped surrounding manner, one side of the first mounting seat 2 and the second mounting seat 5 is in contact, and the other side has a gap in the middle, and the gap is provided with a PLC control cabinet 3 for controlling the entire device. The entire equipment adopts a ring shape, which can facilitate the integrated design of the drawing process and the heat treatment process, and can make the entire equipment more compact, avoid the linear arrangement of the traditional equipment, and make the occupied area too long, which is not conducive to the overall operation of the equipment and the flexible use of the site. The preheating cavity 7, the heating cavity 8, the slow cooling cavity 9 and the cooling cavity 10 are arranged in the inside of the heat treatment seat 1 in a ring shape and sequentially connected end to end. The piano wire can be sequentially pulled out from each cavity, realizing the sequential heat treatment of preheating, heating, slow cooling and cooling of the piano wire.

[0029] In one aspect of the embodiment, the heat treatment seat 1 is symmetrically provided with an inlet hole 12 and an outlet hole 23 on the side away from the PLC control cabinet 3, the inlet hole 12 is in communication with the preheating cavity 7, the outlet hole 23 is in communication with the cooling cavity 10, a first threading hole 14 is provided between the preheating cavity 7 and the heating cavity 8, a second threading hole 16 is provided between the heating cavity 8 and the slow cooling cavity 9, and a third threading hole 19 is provided between the slow cooling cavity 9 and the cooling cavity 10. After the first drawing process is completed by the first drawing die set 4, the piano steel wire enters the preheating cavity 7 from the inlet hole 12 for preheating, is guided by the internal traction guide wheel 13, enters the heating cavity 8 from the first threading hole 14 for heating, is guided by the internal traction guide wheel 13 again, enters the slow cooling cavity 9 from the second threading hole 16 for slow cooling, is guided by the internal traction guide wheel 13 again, enters the cooling cavity 10 from the third threading hole 19 for cooling, and is guided by the internal traction guide wheel 13 again to pass out of the outlet hole 23. The piano steel wire after cooling is drawn by the second drawing die set 6 for the second time, so that the brittle fracture can be avoided, and the production quality of the whole product is improved. The inlet hole 12 and the outlet hole 23 are both provided with a sealing sleeve 38 for sealing threading in and out of the piano steel wire. The sealing sleeve 38 can be sealed by a sealing rubber ring, so that the piano steel wire is tightly threaded through the sealing rubber ring. The sealing rubber ring is made of a high-temperature-resistant material.

[0030] In one aspect of the embodiment, the cooling member includes an aerosol nozzle 20 arranged on the inner wall of the cooling cavity 10, a water inlet pipe 21 is connected to a first port of the aerosol nozzle 20, an air inlet pipe 22 is connected to a second port of the aerosol nozzle 20, and a water leakage pipe is arranged on one side of the bottom of the heat treatment seat 1 and in communication with the cooling cavity 10. The water inlet pipe 21 is connected to a water source by a micro water pump, and the air inlet pipe 22 is connected to an air source by a micro air pump. The gas is an inert gas, such as nitrogen or hydrogen-nitrogen mixed gas. When the water and the inert gas enter the aerosol nozzle 20 at the same time, they are sprayed out in the form of aerosol under high pressure to cool the piano steel wire. The cooling member can be arranged in one group or multiple groups, and is arranged according to the running direction of the piano steel wire, so that the cooling effect on the piano steel wire can be improved by multiple cooling points. The water leakage pipe can discharge the accumulated water in the cooling cavity 10.

[0031] The present application can be used in the field of piano steel wire high-precision cold drawing forming and gradient heat treatment integrated equipment, and can also be applied to other fields of the present application. EMBODIMENT

[0032] The present embodiment is a further improvement on the previous embodiment: as Figures 1-9As shown, the top of the heat treatment seat 1 is provided with an inert gas delivery pipe 11 connected with the heating cavity 8; the inert gas delivery pipe 11 is connected with a gas source through a pump body, and the inert gas is nitrogen or hydrogen-nitrogen mixed gas, etc. The input of the inert gas can protect the piano wire during the heat treatment process, avoid oxidation, and improve the performance of the piano wire. The heating cavity 8 and the slow cooling cavity 9 are provided with a gas passage hole 18 connected therebetween, and the top of the heat treatment seat 1 is provided with a pressure gauge 17 for detecting the gas pressure of the heating cavity 8. Before starting the heat treatment, the inert gas is first delivered into the heating cavity 8 through the inert gas delivery pipe 11, and the inert gas can also enter the slow cooling cavity 9 through the gas passage hole 18 to replace the air in the heating cavity 8 and the slow cooling cavity 9.

[0033] In one aspect of the embodiment, the top of the heat treatment seat 1 is provided with a first U-shaped pipe 24, both ends of the first U-shaped pipe 24 are connected with the slow cooling cavity 9 and the cooling cavity 10 respectively, and the first U-shaped pipe 24 is provided with a first valve 25. The first valve 25 can be controlled to connect the slow cooling cavity 9 and the cooling cavity 10 through the first U-shaped pipe 24. After the inert gas is input into the heating cavity 8, a small part of the gas enters the preheating cavity 7 from the gap of the first threading hole 14, and a large part of the gas enters the slow cooling cavity 9 through the gap of the second threading hole 16 and the gas passage hole 18, and then enters the cooling cavity 10 from the gap of the third threading hole 19. Since the third threading hole 19 is small, the delivery flow of the inert gas is much larger than the outflow of the third threading hole 19. At this time, the first valve 25 can be opened to make the inert gas enter the cooling cavity 10 from the slow cooling cavity 9 through the first U-shaped pipe 24.

[0034] In one aspect of the embodiment, the top of the heat treatment seat 1 is provided with a second U-shaped tube 26, the two ends of the second U-shaped tube 26 are respectively connected with the cooling cavity 10 and the preheating cavity 7, the second U-shaped tube 26 is provided with a second valve 27, and the top of the heat treatment seat 1 is provided with a waste gas discharge pipe 34 connected with the preheating cavity 7. When the inert gas enters the cooling cavity 10, the second valve 27 can be opened at this time, so that the inert gas enters the preheating cavity 7 from the cooling cavity 10 through the second U-shaped tube 26. Since the inert gas in the heating cavity 8 will enter a small part of the preheating cavity 7 from the first threading hole 14, at this time all the inert gas entering the preheating cavity 7 will carry the previous air and be discharged to the designated collection and treatment equipment through the waste gas discharge pipe 34 for treatment, so as to achieve the replacement effect of the air, so that the preheating cavity 7, the heating cavity 8, the slow cooling cavity 9 and the cooling cavity 10 are all filled with inert gas, which effectively protects the entering piano wire during the heat treatment process. At the same time, after the air is replaced, the first valve 25 and the second valve 27 are closed, and the inert gas continues to be delivered. At this time, the inert gas is concentrated in the heating cavity 8 and the slow cooling cavity 9. Since the delivery amount of the inert gas is much larger than the comprehensive outflow amount of the first threading hole 14 and the third threading hole 19, as the inert gas increases, the pressure in the heating cavity 8 and the slow cooling cavity 9 will increase at this time. The internal pressure can be monitored and displayed through the pressure gauge 17. When the pressure reaches a certain value, the delivery of the inert gas is stopped. At this time, the pressure in the heating cavity 8 and the slow cooling cavity 9 is greater than that in the preheating cavity 7 and the cooling cavity 10, and since the inert gas leaks slowly in the threading hole, the heating cavity 8 and the slow cooling cavity 9 can be kept within a certain pressure range, and at the same time, the inert gas can enter the preheating cavity 7 from the heating cavity 8 and enter the cooling cavity 10 from the slow cooling cavity 9. Conversely, it will not cause the waste gas in the preheating cavity 7 to enter the heating cavity 8 from the first threading hole 14 during the heat treatment process, nor will it cause the gas mist in the cooling cavity 10 to enter the slow cooling cavity 9 from the third threading hole 19, so it will not affect the inert gas in the heating cavity 8 and the slow cooling cavity 9, thereby ensuring the protection environment for the heating treatment of the piano wire.

[0035] The working stress of the piano wire is in the range of 0.5-1.5 GPa, which generally does not cause permanent change of the structure. After cold drawing, if the piano wire is under high temperature (>300°C) and medium pressure (hundreds of MPa to 1 GPa), recrystallization or dislocation recovery may occur, resulting in grain refinement or softening. Therefore, the air pressure in the heating cavity 8 and the slow cooling cavity 9 only needs to be controlled to be not more than the threshold of high-pressure phase change. Since the preheating cavity 7 and the cooling cavity 10 are basically in normal pressure state, the heating cavity 8 and the slow cooling cavity 9 only need to be a little higher than the normal pressure, and do not need to form a high-pressure environment, so the structure of the piano wire will not be changed. Embodiment

[0036] As a further improvement of the previous embodiment, as shown inFigures 1-9 As shown, the top of the heat treatment seat 1 is fixedly connected with a gas-water separator 30, the gas inlet end of the gas-water separator 30 is connected with a gas mist conveying pipe 31, the other end of the gas mist conveying pipe 31 is fixedly penetrated through the top of the heat treatment seat 1 and is communicated with the cooling cavity 10, and the bottom end of the gas mist conveying pipe 31 is adjacent to the position corresponding to the third threading hole 19, the gas outlet end of the gas-water separator 30 is connected with an exhaust pipe 32, the other end of the exhaust pipe 32 is fixedly penetrated through the top of the heat treatment seat 1 and is communicated with the slow cooling cavity 9, and the water outlet end of the gas-water separator 30 is connected with a water discharge pipe 33. During the cooling and temperature reduction of the piano wire, a large amount of gas mist exists in the cooling cavity 10, part of the water vapor will condense into liquid water and remain in the inside of the cooling cavity 10, which can be discharged through the water leakage pipe, and part of the water mist will be conveyed upward from the gas mist conveying pipe 31 in the form of gas, and the inert gas in the slow cooling cavity 9 will also enter the cooling cavity 10 from the third threading hole 19, since the position of the gas mist conveying pipe 31 is just adjacent to the position of the third threading hole 19, the inert gas flowing out from the third threading hole 19 will enter the gas mist conveying pipe 31 together with the gas mist. Since the gas in the gas mist is also inert gas, which is the same as the previously replaced inert gas, the mixed gas mist is conveyed from the gas mist conveying pipe 31 to the gas-water separator 30 for gas-liquid separation, the separated inert gas is conveyed from the exhaust pipe 32 to the slow cooling cavity 9, and the separated water is discharged outward from the water discharge pipe 33. By separating the inert gas in the gas mist and then supplementing it to the slow cooling cavity 9, on the one hand, the slow cooling cavity 9 and the heating cavity 8 can be pressurized to a certain extent, so that the pressure in the slow cooling cavity 9 and the heating cavity 8 is always greater than the pressure in the cooling cavity 10 and the preheating cavity 7, thereby enabling the inert gas in the heating cavity 8 and the slow cooling cavity 9 to flow into the preheating cavity 7 and the cooling cavity 10, respectively, to avoid backflow, and the inert gas can be fully utilized, reducing waste and cost; on the other hand, since the gas mist has a certain stability after cooling and temperature reduction of the piano wire through heat exchange, and the inert gas flowing out from the slow cooling cavity 9 also has high stability, the separated inert gas also has high temperature, so that the inert gas conveyed into the slow cooling cavity 9 can be heat exchanged with the inert gas in the slow cooling cavity 9, so that the temperature in the slow cooling cavity 9 is always lower than the temperature in the heating cavity 8, thereby enabling the piano wire to be slowly cooled after heating from the heating cavity 8 into the slow cooling cavity 9 through the temperature difference, so as to ensure the transformation and homogenization of the internal organization of the piano wire, while reducing the strength and improving the toughness; in addition, a small part of the inert gas entering the slow cooling cavity 9 returns to the cooling cavity 10 from the third threading hole 19, and a large part of the inert gas enters the heating cavity 8 from the air hole 18, since the inert gas itself has a certain high temperature, so that the heating requirement of the piano wire can be quickly met after entering the heating cavity 8, without affecting the heating, and in addition, the flow of the inert gas can greatly improve the heating efficiency of the piano wire.

[0037] In one aspect of the embodiment, the top of the heat treatment seat 1 is provided with a third U-shaped tube 28, both ends of which are connected with the preheating cavity 7 and the heating cavity 8 respectively, and the third U-shaped tube 28 is provided with a third valve 29. After the inert gas enters the cooling cavity 10 from the slow cooling cavity 9, the inert gas will reach a high temperature again under the heating of the electric heating tube 15. At this time, the third valve 29 is opened, and the high-temperature inert gas will enter the preheating cavity 7 from the third U-shaped tube 28 and the first threading hole 14 at the same time, thereby realizing the effect of preheating the entering string wire and improving the efficiency of subsequent heating. Under the high-temperature preheating, the lubricating oil on the surface of the string wire will volatilize. The lubricating oil can be volatile oil such as mineral oil, and the volatilized oil will be continuously transported with the inert gas and discharged from the exhaust pipe 34 to the designated treatment equipment for treatment before being discharged. By adjusting and controlling the third valve 29, the air pressure in the heating cavity 8 and the slow cooling cavity 9 can be ensured according to the size of the conveying flow, thereby ensuring the normal operation of the entire equipment. Embodiment

[0038] The embodiment is a further improvement of the previous embodiment. As shown in Figures 1-8 The top of the heat treatment seat 1 is fixedly connected with an air pump 35, the air inlet end of the air pump 35 is connected with an air suction pipe 36, the other end of the air suction pipe 36 is fixedly penetrated through the top of the heat treatment seat 1 and connected with the preheating cavity 7, and the air outlet end of the air pump 35 is connected with a gas conveying pipe 37 for discharging exhaust gas. When the equipment is not used, the air pump 35 can be started, and at the same time, the first valve 25, the second valve 27 and the third valve 29 are opened, so that the exhaust gas in the preheating cavity 7, the heating cavity 8, the slow cooling cavity 9 and the cooling cavity 10 is sucked outwards through the air suction pipe 36, and then conveyed to the designated equipment for recycling treatment through the gas conveying pipe 37.

[0039] However, as known to those skilled in the art, the working principles and wiring methods of the PLC control cabinet 3, the electric heating tube 15, the air mist spray head 20, the gas-water separator 30 and the air pump 35 are common, which all belong to conventional means or common knowledge, and will not be described here. Those skilled in the art can make any selection or arrangement according to their needs or convenience.

[0040] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire, characterized in that, The utility model relates to a kind of symmetrical first mounting seat (2) and second mounting seat (5) being arranged, including: Multiple first drawing module (4) are set in the top of first mounting seat (2), for the first direction of string wire guiding drawing; Multiple second drawing module (6) are set in the top of second mounting seat (5), for the second direction of string wire guiding drawing; It further includes heat treatment seat (1), fixedly arranged between first mounting seat (2) and second mounting seat (5), form integrated equipment, the inside of heat treatment seat (1) is respectively provided with preheating cavity (7), heating cavity (8), slow cooling cavity (9) and cooling cavity (10), string wire enters the inside of heat treatment seat (1) after first drawing process, then sequentially through preheating cavity (7), heating cavity (8), slow cooling cavity (9) and cooling cavity (10) complete gradient heat treatment, improve the strength of string wire, and restore the ductility of material, finally again through second drawing process drawing operation, avoid brittle fracture; The inside of preheating cavity (7), heating cavity (8), slow cooling cavity (9) and cooling cavity (10) is equipped with a set of traction guide wheel (13) for the traction of string wire in heat treatment process is guided; Electric heating pipe (15) is arranged with multiple, is distributed in the inside of heating cavity (8), for the heating of string wire is heated; Cooling piece is arranged in the inside of cooling cavity (10), and at least one set is provided, for the cooling of string wire is cooled. First mounting seat (2) and second mounting seat (5) are arc seat, heat treatment seat (1) is circular seat, first mounting seat (2) and second mounting seat (5) are fixed in the outer wall of heat treatment seat (1) in ring shape and surrounds, the side of first mounting seat (2) and second mounting seat (5) is contacted, the other side is reserved gap, and gap is equipped with PLC control cabinet (3) for the control operation of entire device in the gap; 2. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 1, characterized in that, Preheating cavity (7), heating cavity (8), slow cooling cavity (9) and cooling cavity (10) are sequentially arranged in the inside of heat treatment seat (1) in ring shape and tail to head. Heat treatment seat (1) is symmetrically provided with wire inlet hole (12) and wire outlet hole (23) on the side away from PLC control cabinet (3), wire inlet hole (12) is communicated with preheating cavity (7), and wire outlet hole (23) is communicated with cooling cavity (10); 3. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 2, characterized in that, First threading hole (14) is arranged between preheating cavity (7) and heating cavity (8), second threading hole (16) is arranged between heating cavity (8) and slow cooling cavity (9), and third threading hole (19) is arranged between slow cooling cavity (9) and cooling cavity (10); Sealing sleeve (38) is arranged in wire inlet hole (12) and wire outlet hole (23). Cooling piece includes gas mist sprayer (20) arranged in the inner wall of cooling cavity (10), and water inlet pipe (21) is connected to the first port of gas mist sprayer (20), and air inlet pipe (22) is connected to the second port of gas mist sprayer (20); 4. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 1 or 3, characterized in that, The bottom side of heat treatment seat (1) is provided with water leakage pipe communicated with cooling cavity (10). Inert gas delivery pipe (11) is arranged in the top of heat treatment seat (1) and communicated with heating cavity (8).

5. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 3, characterized in that, ​ The heating cavity (8) and the slow cooling cavity (9) are connected through a ventilation hole (18); The top of the heat treatment seat (1) is provided with a pressure gauge (17) for detecting the air pressure of the heating cavity (8).

6. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 5, characterized in that, The top of the heat treatment seat (1) is provided with a first U-shaped tube (24), and the two ends of the first U-shaped tube (24) are respectively connected with the slow cooling cavity (9) and the cooling cavity (10); The first U-shaped tube (24) is provided with a first valve (25).

7. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 6, characterized in that, The top of the heat treatment seat (1) is provided with a second U-shaped tube (26), and the two ends of the second U-shaped tube (26) are respectively connected with the cooling cavity (10) and the preheating cavity (7); The second U-shaped tube (26) is provided with a second valve (27). The top of the heat treatment seat (1) is provided with a waste gas discharge pipe (34) connected with the preheating cavity (7).

8. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 7, characterized in that, The top of the heat treatment seat (1) is fixedly connected with an air-water separator (30), the air inlet end of the air-water separator (30) is connected with an air mist conveying pipe (31), the other end of the air mist conveying pipe (31) is fixedly penetrated through the top of the heat treatment seat (1) and connected with the cooling cavity (10), and the bottom end of the air mist conveying pipe (31) is adjacent to the third threading hole (19) in position correspondence, the air outlet end of the air-water separator (30) is connected with an exhaust pipe (32), the other end of the exhaust pipe (32) is fixedly penetrated through the top of the heat treatment seat (1) and connected with the slow cooling cavity (9), and the water outlet end of the air-water separator (30) is connected with a drain pipe (33).

9. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 8, characterized in that, The top of the heat treatment seat (1) is provided with a third U-shaped tube (28), and the two ends of the third U-shaped tube (28) are respectively connected with the preheating cavity (7) and the heating cavity (8); The third U-shaped tube (28) is provided with a third valve (29).

10. The high-precision cold-drawing forming and gradient heat treatment integrated equipment for piano wire according to claim 9, characterized in that, The top of the heat treatment seat (1) is fixedly connected with an air pump (35), the air inlet end of the air pump (35) is connected with a suction pipe (36), the other end of the suction pipe (36) is fixedly penetrated through the top of the heat treatment seat (1) and connected with the preheating cavity (7), and the air outlet end of the air pump (35) is connected with a gas conveying pipe (37) for discharging waste gas.

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