A piston rod heat treatment process

Abstract

The invention discloses a piston rod heat treatment process, which specifically comprises the following steps: step 1, pre-treating the piston rod, removing oil stains on the surface of the piston rod by direct current electrolysis, and then sequentially preheating, normalizing, forming a permeation layer, quenching, cooling and tempering the piston rod; step 2, before the preheating treatment, clamping the piston rod in a solid cylinder by using a clamping plate, and then filling the solid cylinder with inert gas, and then preheating; step 3, after preheating, the inert gas is discharged through a side air pipe, and the waste heat is recovered by circulating water, and the water vapor in the inert gas is condensed and recovered by a solid cover and a cotton plate, and then the condensed water is returned to the inside of the solid sleeve through a reflux pipe. The invention relates to the technical field of metal heat treatment, and solves the problem that when processing the piston rod by the existing heat treatment process, the energy consumption loss is easily increased, the use amount of the inert gas is increased, and the preheating waste is easily caused when the inert gas is recovered.

Description

Technical Field

[0001] The invention relates to the technical field of metal heat treatment, in particular to a piston rod heat treatment process. Background Art

[0002] At present, during the heat treatment process of the piston rod, the internal stress of the piston rod will change with the temperature. The rapid temperature change leads to uneven internal stress of the piston rod, which causes small cracks to appear on the surface of the piston rod. During the use of the piston rod, the friction coefficient of the piston rod increases and the mechanical strength decreases. In a heat treatment process for a hole core piston rod with application number CN2020111576922, including pretreatment, preheating, normalizing, forming a carburized layer, quenching, cooling, and tempering steps, other components in the carburizing agent will melt at 950-1000°C, and will form chromium carburizing layers, molybdenum carburizing layers, and vanadium carburizing layers on the surface of the hole core piston rod, which can improve the surface hardness of the hole core piston rod and greatly improve the wear resistance and mechanical strength of the hole core piston rod.

[0003] Although this process has the above advantages, it still has certain disadvantages in actual production: 1) When preheating the process, the existing equipment is used for preheating, which will result in a larger actual preheating space, which will not only cause energy loss, but also increase the amount of inert gas used, thereby increasing the actual production cost; 2) After pretreatment, the inert gas needs to be recovered. When the inert gas is recovered under high temperature conditions, the increased gas pressure not only easily causes the risk of explosion, but also easily leads to waste of waste heat.

[0004] Therefore, it is necessary to solve the problems that still exist in the above process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a piston rod heat treatment process, which solves the problem that the existing heat treatment process easily increases energy consumption loss and increases the amount of inert gas used when processing the piston rod, and easily causes preheating waste when recovering the inert gas.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A piston rod heat treatment process specifically includes the following steps: Step 1: pre-treat the piston rod by removing oil stains on its surface through direct current electrolysis, and then preheat, normalize, form a carburized layer, quench, cool and temper it in sequence; Step 2: Before the preheating treatment, the piston rod is clamped in the solid cylinder by using a clamping plate, and then an inert gas is filled into the solid cylinder, and then the piston rod can be preheated; Step 3: After preheating, the inert gas is discharged through one side of the air pipe, and the waste heat is recovered through the circulating water. The water vapor in the inert gas is condensed and recovered through the solid cover and cotton board, and then the condensed water is returned to the inside of the solid jacket through the reflux pipe.

[0007] Preferably, including: A fixed frame, the fixed frame is used to provide a fixed processing station; A preheating mechanism, the preheating mechanism comprises a solid cylinder, the outer surface of the solid cylinder is fixedly connected to the outer surface of the fixed frame, clamping plates are arranged on both sides of the outer surface of the solid cylinder, the clamping plates on both sides clamp the two ends of the piston rod so that the piston rod is preheated inside the solid cylinder, and two air pipes are connected through the inside of the solid cylinder for the inert gas to enter and exit; A clamping assembly, which is arranged on the outer surface of the clamping plate and radially limits the piston rod; A recovery component is arranged on the body of one of the gas pipes and is used for preheating and recovering the inert gas.

[0008] Preferably, the outer surfaces of the splints on both sides are fixedly connected with push plates, the bodies of the push plates on both sides are slidably connected with sliding rods, one end of the sliding rods on both sides are fixedly connected to the outer surface of the fixed frame, the bodies of the push plates on both sides are threadedly connected with screw rods, one end of the screw rods on both sides are fixedly connected to adjusting motors through couplings, the outer surfaces of the adjusting motors on both sides are fixedly connected to the outer surface of the fixed frame, the outer surfaces of the splints on both sides are fixedly connected with sleeves, the outer surfaces of the sleeves on both sides are movably connected to the two ends of the solid cylinder respectively, annular grooves are provided on the sides of the outer surfaces of the sleeves on both sides that are close to each other, and the insides of the annular grooves on both sides are movably connected with butt rings, and the outer surfaces of the butt rings on both sides are fixedly connected to the two ends of the solid cylinder respectively.

[0009] Preferably, the clamping assembly includes a circular plate, the outer surface of which is fixedly connected to the outer surface of the clamping plate, a through clamping groove is provided at the center of the circular plate, a sliding groove is provided on the outer surface of the circular plate, the interior of the sliding groove is connected to the interior of the clamping groove, a rack is slidably connected to the interior of the sliding groove, a slide is fixedly connected to the outer surface of the rack, the outer surface of the slide is slidably connected to the interior of the sliding groove, and the outer surfaces of the slide and the rack are both slidably connected to the interior of the clamping groove.

[0010] Preferably, a driving unit is provided on the outside of the rack, and the driving unit includes a groove, which is opened on the outer surface of the circular plate, the interior of the groove is connected with the interior of the slide slot, the interior of the groove is rotatably connected with a rotating gear, the outer surface of the rotating gear is meshed with the outer surface of the rack, and a rotating shaft is fixedly connected through the body of the rotating gear, and one end of the rotating shaft is embedded in the inner wall of the groove for rotation connection.

[0011] Preferably, the outer surface of the rotating gear is meshed with a gear ring, the outer surface of the gear ring is rotatably connected to the inside of the groove, the outer surface of the gear ring is slidably connected to the outer surface of the skateboard, the inner ring of the gear ring is meshed with a driving gear, the outer surface of the driving gear is fixedly connected to a driving motor, the output end of the driving motor is rotatably connected to the body of the circular plate, and the outer surface of the driving motor is embedded and fixedly connected to the outer surface of the clamping plate.

[0012] Preferably, the recovery component includes a solid sleeve, the interior of the solid sleeve is connected to the interior of an air pipe, the outer surface of the solid sleeve is fixedly connected with a sleeve shell, the interior of the sleeve shell is provided with a solid cover, the outer surface of the solid cover is fixedly connected with a solid column, and one end of the solid column is fixedly connected to the top of the solid sleeve.

[0013] Preferably, a return pipe is passed through the interior of the casing, one end of the return pipe is passed through and connected to the interior of the solid casing, and two circulation pipes are passed through and connected to the interior of the solid casing.

[0014] Preferably, a full filter unit is arranged inside the solid cover, and the full filter unit comprises a filter plate, the outer surface of the filter plate is fixedly connected to the inside of the casing, and the outer surface of the filter plate is fixedly connected to a cotton plate.

[0015] Preferably, the body of the filter plate is rotatably connected with a rotating rod, the outer surface of the rotating rod is rotatably connected to the interior of the casing, the outer surface of the rotating rod is fixedly connected with a rotating plate, the outer surface of the rotating rod is fixedly connected with a support rod, the outer surface of the support rod is rotatably connected with a roller, and the outer surface of the roller is movably connected to the outer surface of the cotton plate.

[0016] The present invention provides a piston rod heat treatment process. Compared with the prior art, it has the following beneficial effects: (1) By setting up a preheating mechanism and using a solid cylinder to reduce the space required for heating the piston rod, heat loss and the amount of inert gas used can be reduced, thereby saving actual production costs.

[0017] (2) By setting up a clamping assembly, when the two ends of the piston rod are clamped by the clamping plate, the rack is driven by the slide plate to slide radially, so that the piston rod can be radially limited, so that the piston rod and the solid cylinder are coaxially arranged, which not only facilitates uniform heating of the piston rod, but also realizes loading and unloading of the piston rod by clamping one end of the piston rod.

[0018] (3) By providing a driving unit, utilizing the meshing of the driving gear and the gear ring, the meshing of the gear ring and the rack, and the abutment of the slide plate and the gear ring, the gear ring can drive multiple racks to move synchronously and at the same speed, so that the piston rod and the solid cylinder are coaxial.

[0019] (4) By setting up a recovery component, the inside of the solid jacket is filled with circulating liquid water, and the inert gas is brought into contact with the liquid water during recovery, so that the liquid water recovers the waste heat of the inert gas, and the condensation effect of the solid jacket is utilized to separate the water vapor contained in the inert gas.

[0020] (5) By setting up a full filtration unit, when the inert gas is recovered through the casing, the cotton plate that fully covers the inside of the casing can be used to fully adsorb the water vapor contained in the inert gas, and then condense and remove it for recovery through the rolling of the roller. On the one hand, it can improve the purity of the recovered inert gas, and on the other hand, it can make the liquid water fully circulate to avoid waste, and prevent the accumulation of liquid water from affecting the use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the external structure of the present invention; Figure 2 It is a three-dimensional diagram of the external structure of the butt ring of the present invention; Figure 3 It is a three-dimensional diagram of the external structure of the circular plate of the present invention; Figure 4 is a stereoscopic diagram of the external structure of the gear ring of the present invention; Figure 5 A three-dimensional diagram of the internal structure of the fixed sleeve of the present invention; Figure 6 It is a stereoscopic diagram of the external structure of the filter plate of the present invention.

[0022] In the figure: 1, fixed frame; 2, fixed cylinder; 3, clamping plate; 4, clamping assembly; 41, circular plate; 42, clamping groove; 43, sliding groove; 44, rack; 45, driving unit; 451, groove; 452, rotating gear; 453, rotating shaft; 454, gear ring; 455, driving gear; 456, driving motor; 46, slide plate; 5, air pipe; 6, recovery assembly; 61, fixed sleeve; 62, sleeve shell; 63, fixed cover; 64, full filter unit; 641, filter plate; 642, cotton plate; 643, rotating rod; 644, rotating plate; 645, supporting rod; 646, rotating roller; 65, fixed column; 66, reflux pipe; 67, circulation pipe; 7, push plate; 8, sliding rod; 9, screw rod; 10, adjusting motor; 11, sleeve; 12, ring groove; 13, butt ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-6 The present invention provides a technical solution: a piston rod heat treatment process: specifically comprising the following steps: Step 1: pre-treat the piston rod by removing oil stains on its surface through direct current electrolysis, and then preheat, normalize, form a carburized layer, quench, cool and temper it in sequence; Step 2: Before the preheating treatment, the piston rod is clamped in the solid cylinder 2 by using the clamping plate 3, and then the solid cylinder 2 is filled with inert gas, and then the piston rod can be preheated; Step 3: After preheating, the inert gas is discharged through the side air pipe 5, the waste heat is recovered through the circulating water, and the water vapor in the inert gas is condensed and recovered through the solid cover 63 and the cotton board 642, and then the condensed water is returned to the inside of the solid sleeve 61 through the reflux pipe 66.

[0025] Embodiment 1: Refer to the attached manual Figure 1 , Attachment Figure 2 ; The invention comprises a solid frame 1, a preheating mechanism is arranged on the outside of the solid frame 1, the preheating mechanism comprises a solid cylinder 2, the solid cylinder 2 is made of a material with good thermal insulation performance, and a spiral coil is arranged inside (not shown in the figure), and the piston rod is preheated by eddy current heating. The outer surface of the solid cylinder 2 is fixedly connected to the outer surface of the solid frame 1, and clamping plates 3 are arranged on both sides of the outer surface of the solid cylinder 2. The clamping plates 3 are made of the same material as the solid cylinder 2, and a clamping assembly 4 is arranged on the outside of the clamping plates 3. The clamping plates 3 on both sides clamp the two ends of the piston rod so that the piston rod is preheated inside the solid cylinder 2. Two air pipes 5 are connected through the inside of the solid cylinder 2, and the two air pipes 5 are respectively used for the intake and outlet of inert gas, and one end of the air pipe 5 used for intake is connected to the external gas tank, and a flow valve (not shown in the figure) is arranged on the air pipe 5 to control the flow of inert gas and monitor the flow of inert gas. A recovery assembly 6 is arranged on the body of the air pipe 5 for the intake and outlet of inert gas. Push plates 7 are fixedly connected to the outer surfaces of the clamping plates 3 on both sides, and the two air pipes 5 are connected to the outer surface of the two air pipes 5. The body of the side push plate 7 is slidably connected with a slide rod 8, which supports and limits the push plate 7. One end of the slide rod 8 on both sides is fixedly connected to the outer surface of the fixed frame 1. The body of the push plate 7 on both sides is threadedly connected with a screw rod 9. One end of the screw rod 9 on both sides is fixedly connected to an adjusting motor 10 through a coupling. The adjusting motor 10 is made of a servo motor and is electrically connected to an external control circuit. The outer surfaces of the adjusting motors 10 on both sides are fixedly connected to the outer surface of the fixed frame 1. The outer surfaces of the clamping plates 3 on both sides are fixedly connected to the outer surface of the fixed frame 1. Both are fixedly connected with a sleeve 11, which is made of a material that is pressure-resistant, wear-resistant, heat-insulating and has good sealing properties. The outer surfaces of the sleeves 11 on both sides are movably connected to the two ends of the solid tube 2 respectively, and an annular groove 12 is provided on the side of the outer surfaces of the sleeves 11 on both sides that are close to each other. The inside of the annular grooves 12 on both sides are movably connected with a butt ring 13, and the cross-section of the butt ring 13 is trapezoidal. The sealing of the connection between the sleeve 11 and the solid tube 2 is improved through the effect of oblique abutment. The outer surfaces of the butt rings 13 on both sides are fixedly connected to the two ends of the solid tube 2 respectively.

[0026] In this embodiment, the piston rod to be processed is first adjusted, and the motor 10 drives the screw 9 to rotate. Through the threaded connection between the screw 9 and the push plate 7, the push plate 7 moves along the slide rod 8, so that the two side clamps 3 are close to each other, so that the two ends of the piston rod are clamped by the two side clamps 3 to make it inside the solid cylinder 2, and through the connection between the annular groove 12 and the abutment ring 13, the sleeve 11 seals the connection between the clamp 3 and the solid cylinder 2, and then the inert gas is filled into the solid cylinder 2 through the side air pipe 5, and then the spiral coil inside the solid cylinder 2 is energized to preheat the piston rod by eddy current heating.

[0027] Embodiment 2: Based on Embodiment 1, refer to the attached Figure 1 , Attachment Figure 3 ; The clamping assembly 4 includes a circular plate 41, the outer surface of which is fixedly connected to the outer surface of the clamping plate 3, and a through clamping groove 42 is provided at the center of the circular plate 41. The clamping groove 42 is circular and has an inner diameter larger than the outer diameter of the piston rod, and is used for placing the end of the piston rod. A sliding groove 43 is provided on the outer surface of the circular plate 41, and the interior of the sliding groove 43 is connected to the interior of the clamping groove 42. A rack 44 is slidably connected to the interior of the sliding groove 43, and a slide plate 46 is fixedly connected to the outer surface of the rack 44. The rack 44 and the slide plate 46 are combined into an L shape to form a lateral limit, thereby improving the stability of the rack 44, and multiple groups are arranged at equal angles around the axis of the clamping groove 42. At the same time, one end of both is provided with an arc surface to increase the contact area with the surface of the piston rod, thereby improving the effect and stability of limiting the piston rod. The outer surface of the slide plate 46 is slidably connected to the interior of the sliding groove 43, and the outer surfaces of the slide plate 46 and the rack 44 are both slidably connected to the interior of the clamping groove 42.

[0028] In this embodiment, one end of the piston rod is brought into contact with the surface of the clamping plate 3 by inserting the clamping groove 42, and at the same time, one end of the rack 44 slides from the inside of the slide groove 43 to the inside of the clamping groove 42, and the piston rod is radially clamped by the contact between the arc surface of one end and the surface of the piston rod to form radial stability of the piston rod. At the same time, the slide plate 46 moves synchronously with the rack 44, and through the lateral limit connection with the inside of the slide groove 43, the stability and force bearing capacity of the rack 44 are improved.

[0029] Embodiment 3: Based on Embodiment 2, refer to the attached Figure 3 , Attachment Figure 4 ; A driving unit 45 is arranged outside the rack 44. The driving unit 45 includes a groove 451. The groove 451 can provide a concave driving space to prevent the driving device from being arranged outside the circular plate 41 and affecting the clamping effect of the circular plate 41 on the piston rod. The groove 451 is opened on the outer surface of the circular plate 41. The interior of the groove 451 is connected with the interior of the slide groove 43. The interior of the groove 451 is rotatably connected with a rotating gear 452. The axial length of the rotating gear 452 is the same as the depth of the groove 451. The outer surface of the rotating gear 452 is meshed with the outer surface of the rack 44. The body of the rotating gear 452 is fixedly connected with a rotating shaft 453. The connection between the rotating shaft 453 and the circular plate 41 is provided with an axial limiting measure. One end of the rotating shaft 453 is embedded and rotatably connected with the inner wall of the groove 451. The outer surface of the rotating gear 452 is meshed with a gear ring 454. The gear ring 45 The plurality of racks 44 arranged at equal angles can be driven by a plurality of rotating gears 452 to make the plurality of racks 44 move synchronously and at the same speed, so that when the piston rod is clamped, the piston rod is coaxial with the circular plate 41 and the fixed cylinder 2, and the sum of the thicknesses of the gear ring 454, the rack 44 and the slide plate 46 is the same as the depth of the groove 451, the outer surface of the gear ring 454 is rotatably connected to the inside of the groove 451, the outer surface of the gear ring 454 is slidably connected to the outer surface of the slide plate 46, the inner ring of the gear ring 454 is meshed with a driving gear 455, the outer surface of the driving gear 455 is fixedly connected to a driving motor 456, the driving motor 456 is made of a high temperature resistant and explosion-proof servo motor, and is electrically connected to an external control circuit, the output end of the driving motor 456 is rotatably connected to the body of the circular plate 41, and the outer surface of the driving motor 456 is embedded and fixedly connected to the outer surface of the clamping plate 3.

[0030] In this embodiment, after the end of the piston rod is placed inside the clamping groove 42, the output end of the driving motor 456 drives the driving gear 455 to rotate, and through the meshing of the driving gear 455 and the gear ring 454, the meshing of the gear ring 454 and the rotating gear 452, and the meshing of the rotating gear 452 and the rack 44, multiple racks 44 are arranged to move synchronously in the same direction and at the same speed, so that the piston rod can be clamped in the center, so that the piston rod is coaxial with the solid cylinder 2, thereby facilitating the improvement of the heating effect and efficiency of the spiral coil on the piston rod.

[0031] Embodiment 4: Based on Embodiment 3, refer to the attached Figure 1 , Attachment Figure 5 ; The recovery component 6 includes a solid sleeve 61, the interior of the solid sleeve 61 is connected to the interior of an air pipe 5, one end of the air pipe 5 is bent toward the bottom of the interior of the solid sleeve 61, the outer surface of the solid sleeve 61 is fixedly connected with a sleeve shell 62, one end of the sleeve shell 62 is connected to the gas storage tank through a connecting pipe, and a solid cover 63 is arranged inside the sleeve shell 62. The bottom cross-section of the solid cover 63 is larger than the cross-sectional area of ​​the solid sleeve 61, and the water vapor mixed therein is condensed and recovered by contacting with the inert gas after heat exchange, and the outer surface of the solid cover 63 is fixedly connected with a solid Column 65, one end of the fixed column 65 is fixedly connected to the top of the fixed sleeve 61, and a return pipe 66 is connected to the interior of the sleeve 62. The return pipe 66 can facilitate the recovery of condensed water, and the bent end is lower than the bent part of the air pipe 5 to improve the reflux effect. One end of the return pipe 66 is connected to the interior of the fixed sleeve 61, and two circulation pipes 67 are connected to the interior of the fixed sleeve 61. Both circulation pipes 67 are connected to an external water source through a water pump, and the upper circulation pipe 67 makes the liquid level higher than the bent end of the air pipe 5, but lower than its bent top.

[0032] In this embodiment, after the preheating treatment is completed, the high-temperature inert gas is discharged to the outside through an air pipe 5. At the same time, the external water source is used through the action of the pump and the circulation pipe 67 to add external cooling water to the interior of the solid sleeve 61, so that heat exchange is carried out through contact with the inert gas, thereby realizing the recycling of energy and avoiding waste and cost losses. Then, the inert gas after heat exchange is in contact with the solid cover 63, so that the water vapor contained in it condenses and falls into the interior of the shell 62, and flows back to the interior of the solid sleeve 61 through the reflux pipe 66. The inert gas enters the gas storage tank through one end of the shell 62 and the connecting pipe for storage.

[0033] Embodiment 5: Based on Embodiment 4, refer to the attached Figure 5 , Attachment Figure 6 ; The interior of the solid cover 63 is provided with a full filter unit 64, which includes a filter plate 641, which facilitates the communication of the inert gas, and the outer surface of the filter plate 641 is fixedly connected to the interior of the casing 62, and the outer surface of the filter plate 641 is fixedly connected to a cotton plate 642, which is made of filter cotton and can perform water filtering treatment on the inert gas again, and the body of the filter plate 641 is rotatably connected with a rotating rod 643, and the connection between the rotating rod 643 and the filter plate 641 is provided with an axial limit measure and a rotation sealing measure, and the outer surface of the rotating rod 643 is fixedly connected to the casing 62. 2, the outer surface of the rotating rod 643 is fixedly connected with a rotating plate 644, and the rotating plate 644 is arranged in a turbofan blade type. By contacting with the flowing inert gas, the rotating rod 643 is pushed to rotate. The outer surface of the rotating rod 643 is fixedly connected with a supporting rod 645, and the outer surface of the supporting rod 645 is rotatably connected with a roller 646. The spacing between the roller 646 and the filter plate 641 is smaller than the actual thickness of the cotton plate 642, so as to keep squeezing a part of the cotton plate 642 in real time, and the outer surface of the roller 646 is movably connected with the outer surface of the cotton plate 642.

[0034] In this embodiment, the inert gas condensed and dehydrated by the solid cover 63 flows inside the casing 62 for discharge. Through contact with the cotton plate 642, the cotton plate 642 absorbs the remaining moisture in the gas and then discharges it through the filter holes of the filter plate 641. At the same time, the inert gas abuts against the rotating plate 644 when flowing, thereby pushing the rotating rod 643 to rotate, so that the support rod 645 drives the roller 646 to follow the movement. The roller 646 rotates when moving, and can cyclically crush the cotton plate 642, so that the moisture adsorbed by the cotton plate 642 condenses and drips, and refluxes through the reflux pipe 66, so that the recovered inert gas is in a low-temperature dry state, which is convenient for the storage and reuse of the inert gas.

[0035] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston rod heat treatment process, characterized in that: The specific steps include: Step 1: pre-treat the piston rod by removing oil stains on its surface through direct current electrolysis, and then preheat, normalize, form a carburized layer, quench, cool and temper it in sequence; Step 2: Before the preheating treatment is performed, the piston rod is clamped in the solid cylinder (2) by using a clamping plate (3), and then an inert gas is filled into the solid cylinder (2), whereupon the piston rod is preheated; Step 3: After preheating, the inert gas is discharged through a side air pipe (5), and waste heat is recovered through circulating water. Water vapor in the inert gas is condensed and recovered through the solid cover (63) and the cotton board (642), and the condensed water is returned to the inside of the solid jacket (61) through the reflux pipe (66).

2. A piston rod heat treatment process according to claim 1, characterized in that: include: A fixed frame (1), the fixed frame (1) being used to provide a fixed processing station; A preheating mechanism, the preheating mechanism comprising a solid cylinder (2), the outer surface of the solid cylinder (2) being fixedly connected to the outer surface of the fixed frame (1), clamping plates (3) being provided on both sides of the outer surface of the solid cylinder (2), the clamping plates (3) on both sides clamping the two ends of the piston rod so that the piston rod is placed inside the solid cylinder (2) for preheating treatment, and two air pipes (5) are connected through the inside of the solid cylinder (2) for the inert gas to enter and exit; A clamping assembly (4), wherein the clamping assembly (4) is arranged on the outer surface of the clamping plate (3) and radially limits the piston rod; A recovery component (6) is arranged on the body of one of the gas pipes (5) and is used for preheating and recovering the inert gas.

3. A piston rod heat treatment process according to claim 2, characterized in that: The outer surfaces of the clamping plates (3) on both sides are fixedly connected with push plates (7), the bodies of the pushing plates (7) on both sides are slidably connected with slide rods (8), one ends of the slide rods (8) on both sides are fixedly connected with the outer surface of the fixed frame (1), the bodies of the pushing plates (7) on both sides are threadedly connected with screw rods (9), one ends of the screw rods (9) on both sides are fixedly connected with adjustment motors (10) through couplings, the outer surfaces of the adjustment motors (10) on both sides are fixedly connected with the outer surface of the fixed frame (1), the outer surfaces of the clamping plates (3) on both sides are fixedly connected with sleeves (11), the outer surfaces of the sleeves (11) on both sides are movably connected with the two ends of the fixed tube (2), the outer surfaces of the sleeves (11) on both sides are respectively provided with annular grooves (12) on the sides close to each other, the insides of the annular grooves (12) on both sides are movably connected with abutment rings (13), and the outer surfaces of the butt rings (13) on both sides are respectively fixedly connected with the two ends of the fixed tube (2).

4. A piston rod heat treatment process according to claim 2, characterized in that: The clamping assembly (4) comprises a circular plate (41), the outer surface of which is fixedly connected to the outer surface of the clamping plate (3), a through clamping groove (42) is provided at the center of the circular plate (41), a sliding groove (43) is provided on the outer surface of the circular plate (41), the interior of the sliding groove (43) is connected to the interior of the clamping groove (42), a rack (44) is slidably connected to the interior of the sliding groove (43), a slide plate (46) is fixedly connected to the outer surface of the rack (44), the outer surface of the slide plate (46) is slidably connected to the interior of the sliding groove (43), and the outer surfaces of the slide plate (46) and the rack (44) are both slidably connected to the interior of the clamping groove (42).

5. A piston rod heat treatment process according to claim 4, characterized in that: A driving unit (45) is arranged outside the rack (44), and the driving unit (45) comprises a groove (451). The groove (451) is formed on the outer surface of the circular plate (41), the interior of the groove (451) is connected to the interior of the slide groove (43), the interior of the groove (451) is rotatably connected to a rotating gear (452), the outer surface of the rotating gear (452) is meshed with the outer surface of the rack (44), a rotating shaft (453) is fixedly connected to the body of the rotating gear (452), and one end of the rotating shaft (453) is embedded in the inner wall of the groove (451) for rotational connection.

6. A piston rod heat treatment process according to claim 5, characterized in that: The outer surface of the rotating gear (452) is meshed with a gear ring (454), the outer surface of the gear ring (454) is rotatably connected to the inside of the groove (451), the outer surface of the gear ring (454) is slidably connected to the outer surface of the slide plate (46), the inner ring of the gear ring (454) is meshed with a driving gear (455), the outer surface of the driving gear (455) is fixedly connected to a driving motor (456), the output end of the driving motor (456) is rotatably connected to the body of the circular plate (41), and the outer surface of the driving motor (456) is embedded and fixedly connected to the outer surface of the clamping plate (3).

7. A piston rod heat treatment process according to claim 2, characterized in that: The recovery component (6) comprises a fixed sleeve (61), the interior of the fixed sleeve (61) being connected to the interior of a trachea (5), the outer surface of the fixed sleeve (61) being fixedly connected to a sleeve shell (62), the interior of the sleeve shell (62) being provided with a fixed cover (63), the outer surface of the fixed cover (63) being fixedly connected to a fixed column (65), and one end of the fixed column (65) being fixedly connected to the top of the fixed sleeve (61).

8. A piston rod heat treatment process according to claim 7, characterized in that: A return pipe (66) is passed through the interior of the casing (62), one end of the return pipe (66) is passed through and communicated with the interior of the solid casing (61), and two circulation pipes (67) are passed through and communicated with the interior of the solid casing (61).

9. A piston rod heat treatment process according to claim 7, characterized in that: A full filter unit (64) is arranged inside the fixed cover (63), and the full filter unit (64) comprises a filter plate (641). The outer surface of the filter plate (641) is fixedly connected to the inside of the casing (62), and the outer surface of the filter plate (641) is fixedly connected to a cotton plate (642).

10. A piston rod heat treatment process according to claim 9, characterized in that: A rotating rod (643) is rotatably connected to the body of the filter plate (641); the outer surface of the rotating rod (643) is rotatably connected to the inside of the casing (62); the outer surface of the rotating rod (643) is fixedly connected to a rotating plate (644); the outer surface of the rotating rod (643) is fixedly connected to a supporting rod (645); the outer surface of the supporting rod (645) is rotatably connected to a rotating roller (646); the outer surface of the rotating roller (646) is movably connected to the outer surface of the cotton plate (642).

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