Heat treatment process of piston rod

Abstract

The invention belongs to the technical field of heat treatment, and particularly relates to a heat treatment process of a piston rod, which comprises the following steps: S1, pretreatment: forging and forming the piston rod, soaking the formed piston rod in an alkaline electrolyte solution, and removing surface impurities; s2, preheating is conducted, specifically, the pretreated piston rod is preheated at the temperature of 850 DEG C through a fixing mechanism, and the preheating time is 1.5 h; the first clamping plate, the second clamping plate, the bottom plate and the top plate are matched; the distance between the bottom plate and the top plate is adjusted, then the piston rod body is inserted into the top plate and the bottom plate through the through holes, then the piston rod needs to be fixed, the rotating block is rotated, the double-end bidirectional lead screw is driven to rotate through the rotating block, and the first clamping plate and the second clamping plate are driven to move through the double-end bidirectional lead screw; the piston rod body is fixed through the first clamping plate and the second clamping plate, hot air flows smoothly between the piston rod bodies, and heating uniformity of the piston rod bodies is guaranteed.

Description

Technical Field

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

[0002] The piston rod is a connecting component that supports the piston to do work. It is mostly used in oil cylinders and cylinder motion actuators. It is a component used to transmit force and drive the piston to move. The heat treatment process of the piston rod mainly includes tempering treatment, surface quenching and stress relief annealing, etc., which is used to improve the strength, hardness, wear resistance, fatigue strength and toughness of steel. It is one of the important processes in mechanical manufacturing.

[0003] A Chinese patent with publication number CN208898941U discloses a heat treatment device based on hardware processing, including a heat treatment box; it also includes a base and an air-cooled box arranged at the lower end of the base, the heat treatment box is located in the base, and feed channels are arranged on both sides of the base, and a feed inlet and a material guide inlet are arranged on the feed channel. Feed inlets are opened on both sides of the heat treatment box, and the material guide inlet is connected to the feed inlet; a downward pressure cylinder and servo cylinders located on both sides of the downward pressure cylinder are also arranged on the base; the heat treatment device has an automatic feeding function, and the hardware is fed from the inlet. The material enters from the material inlet through the feed port and enters the heat treatment box to complete the feeding. After the feeding is completed, the servo cylinder is used to push the valve block to slide on the guide rail to seal the feed port. After the sealing is completed, the heat treatment box performs a heat treatment process on the hardware. The setting of the valve block prevents the heat from dissipating during the heat treatment. After the heat treatment is completed, the push block of the downward pressure cylinder pushes the heat treatment box down, the feed port is opened, and the heat treatment box enters the air-cooled box. Through this process, the feeding speed of the hardware entering the heat treatment device is effectively accelerated, which is convenient for the subsequent cooling process.

[0004] In the current existing technology, hardware is automatically fed from a feed port and then heat treated, but automatic feeding cannot control the placement of hardware. A large amount of hardware may cause uneven heating of the middle hardware. A small amount of hardware reduces work efficiency. In particular, for rod-shaped workpieces such as piston rods, if they are heated unevenly, their strength, hardness and wear resistance will be affected, and there will be a risk of breakage during operation.

[0005] To this end, the present invention provides a heat treatment process for a piston rod. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a heat treatment process for a piston rod according to the present invention, the treatment process comprises the following steps: S1: Pretreatment: The piston rod is forged and formed, and the formed plug rod is immersed in an alkaline electrolyte solution to remove surface impurities; S2: Preheating: The pretreated piston rod is preheated at 850-910°C through a fixing mechanism for 1-1.5 hours; S3: Normalizing: The preheated piston rod is kept at 950-1000℃ for 3-5h, cooled to 350-450℃ after the end of the heat preservation, and then the piston rod is placed in the penetrant and heated to 950-1000℃ and kept for 5-8h; S4: Quenching: Keep the normalized piston rod at 1000-1100℃ for 3-4h, and then place the piston rod in coolant for cooling; S5: Tempering: After quenching and cooling, the piston rod is kept at 100-180℃ for 3-5h. After the insulation is completed, the piston rod is cooled to room temperature.

[0008] Preferably, the fixing mechanism comprises a top plate, a bottom plate, a first connecting rod and a second connecting rod, the first connecting rod being fixedly connected to the bottom of the top plate, the second connecting rod being fixedly connected to the top of the bottom plate, the second connecting rod sliding in the first connecting rod, the top plate being provided with a plurality of through holes, and a piston rod body being inserted therein; three double-headed bidirectional screw rods are provided at the bottom of the top plate, both ends of the double-headed bidirectional screw rods are fixedly connected to the top plate through a fixing plate, and both ends of the double-headed bidirectional screw rods are rotatably connected to the fixing plate through bearings, one end of the double-headed bidirectional screw rod is threadedly connected to two first clamping plates, the other end of the double-headed bidirectional screw rod is threadedly connected to two second clamping plates, two piston rod bodies are provided between the two first clamping plates, and three piston rod bodies are provided between the two second clamping plates; one end of the double-headed bidirectional screw rod close to the second clamping plate is fixedly connected to a rotating block, the top end of the first clamping plate is slidably connected to two second limiting rods, the top end of the second clamping plate is slidably connected to two first limiting rods, and the first limiting rod and the second limiting rod are fixed to the bottom of the top plate.

[0009] Preferably, the outer side of the bottom plate is rotatably connected to a base via a bearing, a protective box is fixedly connected to the bottom of the base, a motor is fixedly connected inside the protective box, the output shaft of the motor is rotatably connected to the base via a bearing, and is extended and fixedly connected to a first gear, the bottom of the bottom plate is fixedly connected to a pillar, a second gear is fixedly connected to the pillar, and the first gear is meshed with the second gear.

[0010] Preferably, a reciprocating screw is rotatably connected to the top plate via a bearing, and the second connecting rod is threadedly connected to the reciprocating screw; a fixing box is fixedly connected to the top of the top plate, one end of the reciprocating screw extends into the fixing box, the top end of the reciprocating screw is fixedly connected to the first bevel gear, a handle is rotatably connected to the fixing box, one end of the handle is fixedly connected to the second bevel gear, and the first bevel gear is meshed with the second bevel gear.

[0011] Preferably, a heating tube is provided on the outer side of the base, a cover plate is provided on the top of the heating tube, and a second fan is fixedly connected to the bottom of the cover plate; heaters are provided on both sides of the heating tube, an outer side wall of one of the heaters is fixedly connected to a controller, and both heaters are electrically connected to the controller.

[0012] Preferably, two electric push rods are symmetrically fixed to the inner wall of the bottom of the heating cylinder, and the output ends of the electric push rods are fixed with blocking blocks. Two cross bars are fixed to the inner wall of the heating cylinder, and the two ends of the blocking blocks slide on the cross bars respectively; the inner side walls of the blocking blocks are matched with the base.

[0013] Preferably, the bottom of the bottom plate is connected and fixedly connected with a first drain pipe, on which a first solenoid valve is installed; the bottom of the base is connected and fixedly connected with a second drain pipe, on which a second solenoid valve is installed.

[0014] Preferably, the bottom of the heating cylinder is connected and fixedly connected to a box body; the bottom of the box body is fixedly connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected to the bottom of the base; a cooling chamber, an infiltration chamber and a liquid storage chamber are respectively formed in the box body through partitions.

[0015] Preferably, a vertical plate is fixedly connected to the inner wall of the bottom of the cooling chamber, a first fan is installed on the vertical plate, a plurality of fins are fixedly connected to one end of the cooling chamber close to the partition, a condenser is connected and inserted on the fin; one end of the condenser is connected and fixedly connected to the top of the partition; the other end of the condenser is connected and fixedly connected to the bottom end of the partition, and a circulating pump is installed, and a filter is provided between the condenser and the partition.

[0016] Preferably, a connecting pipe is connected and fixedly connected to the box body, one end of which extends to the bottom end of the infiltration chamber; the other end of the connecting pipe extends to the top end of the liquid storage chamber; a water pump is installed on the connecting pipe; the bottom of the infiltration chamber is connected and fixedly connected to a sewage pipe, and a sewage valve is installed on the sewage pipe; the top of the infiltration chamber is connected and fixedly connected to a liquid inlet pipe.

[0017] The beneficial effects of the present invention are as follows: 1. A heat treatment process for a piston rod described in the present invention comprises the following steps: the first clamping plate, the second clamping plate, the bottom plate and the top plate are matched; the distance between the bottom plate and the top plate is adjusted by the first connecting rod and the second connecting rod; and then the piston rod body is inserted on the top plate and the bottom plate through the through hole; since the diameters of the piston rod bodies are different, the piston rod needs to be fixed; the rotary block is rotated to drive the double-headed bidirectional screw to rotate; the double-headed bidirectional screw drives the first clamping plate and the second clamping plate to move; wherein the two first clamping plates are simultaneously moved in the direction opposite to ... The piston rod body of the inner circle moves until the piston rod body is clamped; the two second clamping plates move toward the piston rod body of the outer circle at the same time with the cooperation of two reverse thread grooves until the piston rod body is clamped; during the movement of the first clamping plate and the second clamping plate, the first clamping plate slides on the second limit rod, and the second clamping plate slides on the first limit rod, maintaining the stability of the movement of the first clamping plate and the second clamping plate, thereby realizing the fixing function of the piston rod body, each piston rod body is separated from each other, and the hot air flow flows smoothly between the piston rod bodies, ensuring the uniformity of heating of the piston rod bodies.

[0018] 2. A heat treatment process for a piston rod described in the present invention is achieved through the cooperation of an infiltration chamber, a cooling chamber and a liquid storage chamber; the infiltration chamber is used for infiltrating the piston rod with a penetrant and a coolant, the cooling chamber is used for promoting the cooling of the coolant, and the penetrant is placed in the liquid storage chamber; during cooling and infiltration, the fixing mechanism can be kept rotating; the coolant is input into the infiltration chamber through the liquid inlet pipe, and the fixing mechanism is lowered to the infiltration chamber of the casing through the hydraulic cylinder for cooling, at which time the circulating pump and the first fan are turned on, and the coolant in the infiltration chamber is input into the condenser through the circulating pump, and the coolant passes through the condenser and the fins, and the coolant dissipates heat quickly, and the heat dissipation of the coolant is accelerated by the first fan, and finally circulates from the other end of the condenser to the infiltration chamber, thereby cooling the coolant and keeping the coolant at a low temperature, which is beneficial to the heat dissipation of the piston rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a stereogram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a structural schematic diagram of the blocking block in the present invention; Figure 4 It is a structural schematic diagram of the cross section of the heating cylinder in the present invention; Figure 5 It is a schematic diagram of the structure of the first clamping block and the second clamping block in the present invention; Figure 6 is a schematic structural diagram of the first connecting rod and the second connecting rod in the present invention; Figure 7is a schematic diagram of the structure of the first gear and the second gear in the present invention; Figure 8 It is a schematic diagram of the structure of the condenser tube and the fin in the present invention; Fig. 9 It is a process flow chart of an embodiment of the present invention; In the figure: 1, box body; 11, hydraulic cylinder; 12, sewage pipe; 13, liquid inlet pipe; 14, water pump; 141, connecting pipe; 15, cooling chamber; 151, vertical plate; 152, first fan; 153, fin; 154, condenser; 155, circulation pump; 16, infiltration chamber; 17, liquid storage chamber; 2, heating cylinder; 21, cover plate; 211, second fan; 22, heater; 221, controller; 23, top plate; 231, piston rod body; 232, bottom plate; 233, base; 234, double-headed bidirectional screw; 2341, first clamping plate; 2342, first Two clamping plates; 2343, fixed plate; 2344, rotary block; 2345, first limit rod; 2346, second limit rod; 235, fixed box; 2351, first connecting rod; 2352, second connecting rod; 2353, reciprocating screw; 2354, first bevel gear; 2355, second bevel gear; 2356, handle; 236, electric push rod; 2361, blocking block; 2362, cross bar; 237, protective box; 2371, motor; 2372, first gear; 2373, second gear; 238, first drain pipe; 239, second drain pipe. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] Embodiment 1: like Fig. 9 As shown, a heat treatment process for a piston rod according to an embodiment of the present invention comprises the following steps: S1: Pretreatment: The piston rod is forged and formed, and the formed plug rod is immersed in an alkaline electrolyte solution to remove surface impurities; S2: Preheating: The pretreated piston rod is preheated at 850°C through a fixing mechanism for 1.5 hours; S3: Normalizing: The preheated piston rod is kept at 950℃ for 5 hours, cooled to 350℃ after the end of the heat preservation, and then the piston rod is placed in the penetrant and heated to 950℃ and kept for 8 hours; S4: Quenching: Keep the normalized piston rod at 1000°C for 4 hours, and then place the piston rod in coolant for cooling; S5: Tempering: After quenching and cooling, the piston rod is kept at 100°C for 5 hours. After the heat preservation is completed, the piston rod is cooled to room temperature.

[0023] Embodiment 2: like Fig. 9 As shown, a heat treatment process for a piston rod according to an embodiment of the present invention comprises the following steps: S1: Pretreatment: The piston rod is forged and formed, and the formed plug rod is immersed in an alkaline electrolyte solution to remove surface impurities; S2: Preheating: The pretreated piston rod is preheated at 880°C through a fixing mechanism for 1.25 hours; S3: Normalizing: The preheated piston rod is kept at 975℃ for 4 hours, cooled to 400℃ after the end of the heat preservation, and then the piston rod is placed in the penetrant and heated to 975℃ and kept for 6.5 hours; S4: Quenching: Keep the normalized piston rod at 1050°C for 3.5 hours, and then place the piston rod in coolant for cooling; S5: Tempering: After quenching and cooling, the piston rod is kept at 140°C for 4 hours. After the heat preservation is completed, the piston rod is cooled to room temperature.

[0024] Embodiment three: like Fig. 9 As shown, a heat treatment process for a piston rod according to an embodiment of the present invention comprises the following steps: S1: Pretreatment: The piston rod is forged and formed, and the formed plug rod is immersed in an alkaline electrolyte solution to remove surface impurities; S2: Preheating: The pretreated piston rod is preheated at 910°C through a fixing mechanism for 1 hour; S3: Normalizing: The preheated piston rod is kept at 1000℃ for 3 hours, cooled to 450℃ after the end of the heat preservation, and then the piston rod is placed in the penetrant and heated to 1000℃ and kept for 5 hours; S4: Quenching: Keep the normalized piston rod at 1100°C for 3 hours, and then place the piston rod in coolant for cooling; S5: Tempering: After quenching and cooling, the piston rod is kept at 180°C for 3 hours. After the heat preservation is completed, the piston rod is cooled to room temperature.

[0025] like Figures 1 to 8As shown, the fixing mechanism includes a top plate 23, a bottom plate 232, a first connecting rod 2351 and a second connecting rod 2352, the first connecting rod 2351 is fixedly connected to the bottom of the top plate 23, the second connecting rod 2352 is fixedly connected to the top of the bottom plate 232, the second connecting rod 2352 slides in the first connecting rod 2351, a plurality of through holes are opened on the top plate 23, and a piston rod body 231 is inserted; three double-headed bidirectional screw rods 234 are provided at the bottom of the top plate 23, both ends of the double-headed bidirectional screw rods 234 are fixedly connected to the top plate 23 through a fixing plate 2343, and both ends of the double-headed bidirectional screw rods 234 are rotatably connected to the fixing plate 2343 through bearings, and the double-headed bidirectional screw rods 23 4 is threadedly connected to two first clamping plates 2341 at one end, and two second clamping plates 2342 are threadedly connected to the other end of the double-headed bidirectional screw rod 234, two piston rod bodies 231 are provided between the two first clamping plates 2341, and three piston rod bodies 231 are provided between the two second clamping plates 2342; one end of the double-headed bidirectional screw rod 234 close to the second clamping plate 2342 is fixedly connected with a rotating block 2344, the top end of the first clamping plate 2341 is slidably connected to two second limiting rods 2346, the top end of the second clamping plate 2342 is slidably connected to two first limiting rods 2345, and the first limiting rod 2345 and the second limiting rod 2346 are fixedly connected to the bottom of the top plate 23.

[0026] If the piston rod is heated unevenly during heat treatment, its strength, hardness and wear resistance will be affected. In order to keep the piston rod heated evenly during heat treatment, the fixing mechanism provided by the present invention is first used to adjust the distance between the bottom plate 232 and the top plate 23 through the first connecting rod 2351 and the second connecting rod 2352, and then the piston rod body 231 is inserted into the top plate 23 and the bottom plate 232 through the through hole. Since the diameters of the piston rod body 231 are different, the piston rod needs to be fixed. By rotating the rotary block 2344, the double-headed bidirectional screw 234 is driven to rotate by the rotary block 2344, and the first clamping plate 2341 and the second clamping plate 2342 are driven to move by the double-headed bidirectional screw 234, wherein the two first clamping plates 2341 are in two reverse thread grooves. With the cooperation of the two reverse thread grooves, the two second clamping plates 2342 move simultaneously toward the piston rod body 231 of the inner circle until the piston rod body 231 is clamped; the two second clamping plates 2342 move simultaneously toward the piston rod body 231 of the outer circle with the cooperation of the two reverse thread grooves until the piston rod body 231 is clamped; during the movement of the first clamping plate 2341 and the second clamping plate 2342, the first clamping plate 2341 slides on the second limiting rod 2346, and the second clamping plate 2342 slides on the first limiting rod 2345, maintaining the stability of the movement of the first clamping plate 2341 and the second clamping plate 2342, thereby realizing the fixing function of the piston rod body 231, each piston rod body 231 is separated from each other, and the hot air flow flows smoothly between the piston rod bodies 231, ensuring the uniformity of heating of the piston rod bodies 231.

[0027] like Figure 4 and Figure 7 As shown, the outer side of the bottom plate 232 is rotatably connected to the base 233 via a bearing, the bottom of the base 233 is fixedly connected to a protective box 237, a motor 2371 is fixedly connected inside the protective box 237, the output shaft of the motor 2371 is rotatably connected to the base 233 via a bearing, and is extended and fixedly connected to a first gear 2372, the bottom of the bottom plate 232 is fixedly connected to a pillar, a second gear 2373 is fixedly connected to the pillar, and the first gear 2372 is meshed with the second gear 2373.

[0028] The first gear 2372 and the second gear 2373 provided by the present invention are used to drive the rotation of the fixing mechanism when in use. By turning on the motor 2371, the motor 2371 drives the first gear 2372 to rotate through the output shaft, and drives the second gear 2373 to rotate through the first gear 2372. The second gear 2373 drives the base plate 232 to rotate through the support, and drives the fixing mechanism to rotate through the base plate 232. When the fixing mechanism rotates, the piston rod body 231 rotates to keep each piston rod body 231 evenly close to the heater 22.

[0029] like Figure 4 and Figure 6As shown, a reciprocating screw rod 2353 is rotatably connected to the top plate 23 through a bearing, and the second connecting rod 2352 is threadedly connected to the reciprocating screw rod 2353; a fixed box 235 is fixedly connected to the top of the top plate 23, one end of the reciprocating screw rod 2353 extends into the fixed box 235, and the top end of the reciprocating screw rod 2353 is fixedly connected to the first bevel gear 2354, and a handle 2356 is rotatably connected to the fixed box 235, and one end of the handle 2356 is fixedly connected to the second bevel gear 2355, and the first bevel gear 2354 is meshed with the second bevel gear 2355.

[0030] The first bevel gear 2354 and the second bevel gear 2355 provided by the present invention are used to adjust the distance between the bottom plate 232 and the top plate 23 through the first connecting rod 2351 and the second connecting rod 2352 when in use. By rotating the handle 2356, the second bevel gear 2355 is driven to rotate through the handle 2356, the first bevel gear 2354 is driven to rotate through the second bevel gear 2355, the reciprocating screw rod 2353 is driven to rotate through the first bevel gear 2354, the second connecting rod 2352 is driven to reciprocate up and down through the reciprocating screw rod 2353, and the bottom plate 232 is driven to reciprocate up and down through the second connecting rod 2352, thereby achieving the adjustment of the distance between the bottom plate 232 and the top plate 23, which is suitable for fixing piston rod bodies 231 of different lengths.

[0031] like Figure 2 As shown, a heating tube 2 is provided on the outer side of the base 233, a cover plate 21 is provided on the top of the heating tube 2, and a second fan 211 is fixedly connected to the bottom of the cover plate 21; heaters 22 are provided on both sides of the heating tube 2, an outer side wall of one of the heaters 22 is fixedly connected to a controller 221, and both heaters 22 are electrically connected to the controller 221.

[0032] When the heater 22 and the first fan 152 provided by the present invention are in use, the controller 221 controls the start and temperature change of the heater 22, which is convenient for different temperatures and insulation times for preheating, normalizing, quenching and tempering. The first fan 152 is used to decelerate the airflow and blow the hot air flow evenly.

[0033] like Figure 2 and Figure 3 As shown, two electric push rods 236 are symmetrically fixed on the inner wall of the bottom of the heating tube 2, and the output ends of the electric push rods 236 are fixed with blocking blocks 2361. Two cross bars 2362 are fixed on the inner wall of the heating tube 2, and the two ends of the blocking blocks 2361 slide on the cross bars 2362 respectively; the inner side walls of the blocking blocks 2361 are matched with the base 233.

[0034] When the blocking block 2361 provided by the present invention is in use and during heating, the electric push rod 236 needs to be turned on, and the blocking block 2361 is driven to move by the output shaft of the electric push rod 236, so that the blocking block 2361 is in close contact with the base 233 to prevent hot air from overflowing. When the fixing mechanism needs to be lowered to the box body 1, the blocking block 2361 can be moved to both sides by the electric push rod 236.

[0035] like Figure 4 As shown, the bottom of the bottom plate 232 is connected and fixedly connected with a first drain pipe 238, on which a first solenoid valve is installed; the bottom of the base 233 is connected and fixedly connected with a second drain pipe 239, on which a second solenoid valve is installed.

[0036] When the first drain pipe 238 and the second drain pipe 239 provided by the present invention are in use, when the piston rod body 231 is cooled, part of the liquid remains in the base 233. By opening the first solenoid valve and the second solenoid valve, the liquid flows out through the first drain pipe 238 and the second drain pipe 239 respectively, and the quenching process and the like are continued.

[0037] like Figure 2 As shown, the bottom of the heating cylinder 2 is connected and fixedly connected to the box body 1; the bottom of the box body 1 is fixedly connected to the hydraulic cylinder 11, and the output end of the hydraulic cylinder 11 is fixedly connected to the bottom of the base 233; the cooling chamber 15, the infiltration chamber 16 and the liquid storage chamber 17 are respectively formed in the box body 1 through partitions.

[0038] When the cooling chamber 15, the infiltration chamber 16 and the liquid storage chamber 17 provided by the present invention are in use, the infiltration chamber 16 is used to infiltrate the piston rod with the penetrant and the coolant, the cooling chamber 15 is used to promote the cooling of the coolant, and the liquid storage chamber 17 is used to place the penetrant; during cooling and infiltration, the fixing mechanism can be kept rotating.

[0039] like Figure 1 and Figure 8 As shown, a vertical plate 151 is fixedly connected to the bottom inner wall of the cooling chamber 15, and a first fan 152 is installed on the vertical plate 151; a plurality of fins 153 are fixedly connected to one end of the cooling chamber 15 close to the partition, and a condenser 154 is connected and inserted on the fin 153; one end of the condenser 154 is connected and fixedly connected to the top of the partition; the other end of the condenser 154 is connected and fixedly connected to the bottom end of the partition, and a circulating pump 155 is installed, and a filter is provided between the condenser 154 and the partition.

[0040] When the condenser 154 and the fin 153 provided by the present invention are in use, the coolant is input into the wetting chamber 16 through the liquid inlet pipe 13, and the fixing mechanism is lowered to the wetting chamber 16 of the box body 1 for cooling through the hydraulic cylinder 11. At this time, the circulating pump 155 and the first fan 152 are turned on, and the coolant in the wetting chamber 16 is input into the condenser 154 through the circulating pump 155. The coolant passes through the condenser 154 and the fin 153, and the coolant dissipates heat quickly. The heat dissipation of the coolant is accelerated by the first fan 152, and finally circulates from the other end of the condenser 154 to the wetting chamber 16, so as to cool the coolant and keep the coolant at a low temperature, which is beneficial to the heat dissipation of the piston rod body 231.

[0041] like Figure 1 to Figure 2 As shown, the box body 1 is connected and fixedly connected with a connecting pipe 141, one end of which extends to the bottom end of the infiltration chamber 16; the other end of the connecting pipe 141 extends to the top end of the liquid storage chamber 17; a water pump 14 is installed on the connecting pipe 141; the bottom of the infiltration chamber 16 is connected and fixedly connected with a drain pipe 12, and a drain valve is installed on the drain pipe 12; the top end of the infiltration chamber 16 is connected and fixedly connected with a liquid inlet pipe 13.

[0042] When the connecting tube 141 provided by the present invention is in use, the piston rod body 231 is soaked in the penetrant and the oxide on the surface will fall off. Therefore, after the infiltration is completed, the penetrant is transported to the liquid storage chamber 17 through the connecting tube 141 by the water pump 14. Since one end of the connecting tube 141 does not contact the bottom of the infiltration chamber 16, the precipitate will remain in the infiltration chamber 16 and finally be discharged through the drain pipe 12.

[0043] Working principle: First, the distance between the bottom plate 232 and the top plate 23 is adjusted by the first connecting rod 2351 and the second connecting rod 2352, and then the piston rod body 231 is inserted into the top plate 23 and the bottom plate 232 through the through hole. Since the diameters of the piston rod body 231 are different, the piston rod needs to be fixed, and the rotary block 2344 is rotated to drive the double-headed bidirectional screw rod 234 to rotate, and the double-headed bidirectional screw rod 234 drives the first clamping plate 2341 and the second clamping plate 2342 to move, wherein the two first clamping plates 2341 move toward the inner ring of the piston rod body 231 at the same time with the cooperation of the two reverse thread grooves until the piston rod body is fixed. 231 clamping; the two second clamping plates 2342 move toward the outer ring piston rod body 231 at the same time with the cooperation of the two reverse thread grooves until the piston rod body 231 is clamped; during the movement of the first clamping plate 2341 and the second clamping plate 2342, the first clamping plate 2341 slides on the second limiting rod 2346, and the second clamping plate 2342 slides on the first limiting rod 2345, so as to maintain the stability of the movement of the first clamping plate 2341 and the second clamping plate 2342, thereby realizing the fixing function of the piston rod body 231, each piston rod body 231 is separated from each other, and the hot air flow flows smoothly between the piston rod bodies 231, so as to ensure the uniformity of heating of the piston rod bodies 231; By rotating the handle 2356, the second bevel gear 2355 is driven to rotate through the handle 2356, the first bevel gear 2354 is driven to rotate through the second bevel gear 2355, the reciprocating screw rod 2353 is driven to rotate through the first bevel gear 2354, the second connecting rod 2352 is driven to reciprocate up and down through the reciprocating screw rod 2353, and the bottom plate 232 is driven to reciprocate up and down through the second connecting rod 2352, thereby adjusting the distance between the bottom plate 232 and the top plate 23, which is suitable for fixing piston rod bodies 231 of different lengths; By turning on the motor 2371, the motor 2371 drives the first gear 2372 to rotate through the output shaft, drives the second gear 2373 to rotate through the first gear 2372, and the second gear 2373 drives the bottom plate 232 to rotate through the support, and drives the fixing mechanism to rotate through the bottom plate 232. When the fixing mechanism rotates, the piston rod body 231 rotates to keep each piston rod body 231 evenly close to the heater 22; The infiltration chamber 16 is used for infiltrating the piston rod with penetrant and coolant, the cooling chamber 15 is used to promote the cooling of the coolant, and the penetrant is placed in the liquid storage chamber 17; during cooling and infiltration, the fixing mechanism can be kept rotating; the coolant is input into the infiltration chamber 16 through the liquid inlet pipe 13, and the fixing mechanism is lowered to the infiltration chamber 16 of the box body 1 through the hydraulic cylinder 11 for cooling. At this time, the circulating pump 155 and the first fan 152 are turned on, and the coolant in the infiltration chamber 16 is input into the condenser 154 through the circulating pump 155. The coolant passes through the condenser 154 and the fins 153, and the coolant dissipates heat quickly. The heat dissipation of the coolant is accelerated by the first fan 152, and finally circulates from the other end of the condenser 154 to the infiltration chamber 16, thereby cooling the coolant and keeping the coolant at a low temperature, which is beneficial to the heat dissipation of the piston rod body 231.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat treatment process for a piston rod, the process comprising the following steps: S1： Pretreatment: Forging the piston rod, and immersing the formed piston rod in an alkaline electrolyte solution to remove surface impurities; S2: Preheating: The pretreated piston rod is preheated at 850-910°C through a fixing mechanism for 1-1.5 hours; S3: Normalizing: The preheated piston rod is kept at 950-1000℃ for 3-5h, cooled to 350-450℃ after the end of the heat preservation, and then the piston rod is placed in the penetrant and heated to 950-1000℃ and kept for 5-8h; S4: Quenching: Keep the normalized piston rod at 1000-1100℃ for 3-4h, and then place the piston rod in coolant for cooling; S5: Tempering: After quenching and cooling, the piston rod is kept at 100-180℃ for 3-5h. After the insulation is completed, the piston rod is cooled to room temperature.

2. The heat treatment process for a piston rod according to claim 1, characterized in that: The fixing mechanism comprises a top plate (23), a bottom plate (232), a first connecting rod (2351) and a second connecting rod (2352), wherein the first connecting rod (2351) is fixedly connected to the bottom of the top plate (23), the second connecting rod (2352) is fixedly connected to the top of the bottom plate (232), and the second connecting rod (2352) slides in the first connecting rod (2351). A plurality of through holes are provided on the top plate (23) and a piston rod body (231) is inserted therein; three double-headed bidirectional screw rods (234) are provided at the bottom of the top plate (23), both ends of the double-headed bidirectional screw rods (234) are fixedly connected to the top plate (23) via a fixing plate (2343), and both ends of the double-headed bidirectional screw rods (234) are rotatably connected to the fixing plate (2343) via bearings, and the double-headed bidirectional screw rods (234) are rotatably connected to the fixing plate (2343) via bearings. 4) are threadedly connected to two first clamping plates (2341) at one end, and two second clamping plates (2342) are threadedly connected to the other end of the double-headed bidirectional screw rod (234), two piston rod bodies (231) are arranged between the two first clamping plates (2341), and three piston rod bodies (231) are arranged between the two second clamping plates (2342); one end of the double-headed bidirectional screw rod (234) close to the second clamping plate (2342) is fixedly connected to a rotating block (2344), the top end of the first clamping plate (2341) is slidably connected to two second limiting rods (2346), the top end of the second clamping plate (2342) is slidably connected to two first limiting rods (2345), and the first limiting rod (2345) and the second limiting rod (2346) are fixedly connected to the bottom of the top plate (23).

3. The heat treatment process for a piston rod according to claim 2, characterized in that: The outer side of the bottom plate (232) is rotatably connected to a base (233) via a bearing, a protective box (237) is fixedly connected to the bottom of the base (233), a motor (2371) is fixedly connected inside the protective box (237), an output shaft of the motor (2371) is rotatably connected to the base (233) via a bearing, and a first gear (2372) is extended and fixedly connected thereto, a pillar is fixedly connected to the bottom of the bottom plate (232), a second gear (2373) is fixedly connected to the pillar, and the first gear (2372) is meshed with the second gear (2373).

4. The heat treatment process for a piston rod according to claim 3, characterized in that: A reciprocating screw rod (2353) is rotatably connected to the top plate (23) via a bearing, and the second connecting rod (2352) is threadedly connected to the reciprocating screw rod (2353); a fixing box (235) is fixedly connected to the top of the top plate (23), one end of the reciprocating screw rod (2353) extends into the fixing box (235), the top end of the reciprocating screw rod (2353) is fixedly connected to a first bevel gear (2354), a handle (2356) is rotatably connected to the fixing box (2355), one end of the handle (2356) is fixedly connected to a second bevel gear (2355), and the first bevel gear (2354) is meshed with the second bevel gear (2355).

5. The heat treatment process for a piston rod according to claim 4, characterized in that: A heating cylinder (2) is provided on the outside of the base (233), a cover plate (21) is provided on the top of the heating cylinder (2), and a second fan (211) is fixedly connected to the bottom of the cover plate (21); heaters (22) are provided on both sides of the heating cylinder (2), an outer wall of one of the heaters (22) is fixedly connected to a controller (221), and both heaters (22) are electrically connected to the controller (221).

6. The heat treatment process for a piston rod according to claim 5, characterized in that: Two electric push rods (236) are symmetrically fixedly connected to the inner wall of the bottom of the heating cylinder (2); the output ends of the electric push rods (236) are fixedly connected to blocking blocks (2361); two cross bars (2362) are fixedly connected to the inner wall of the heating cylinder (2); the two ends of the blocking blocks (2361) slide on the cross bars (2362) respectively; the inner side walls of the blocking blocks (2361) are matched with the base (233).

7. The heat treatment process for a piston rod according to claim 6, characterized in that: The bottom of the bottom plate (232) is connected and fixedly connected to a first drainage pipe (238), and a first solenoid valve is installed on the first drainage pipe (238); the bottom of the base (233) is connected and fixedly connected to a second drainage pipe (239), and a second solenoid valve is installed on the second drainage pipe (239).

8. The heat treatment process for a piston rod according to claim 7, characterized in that: The bottom of the heating cylinder (2) is connected and fixedly connected to a box body (1); the bottom of the box body (1) is fixedly connected to a hydraulic cylinder (11), and the output end of the hydraulic cylinder (11) is fixedly connected to the bottom of a base (233); a cooling chamber (15), an infiltration chamber (16) and a liquid storage chamber (17) are respectively formed in the box body (1) through a partition.

9. The heat treatment process for a piston rod according to claim 8, characterized in that: A vertical plate (151) is fixedly connected to the inner wall of the bottom of the cooling chamber (15), and a first fan (152) is installed on the vertical plate (151). A plurality of fins (153) are fixedly connected to one end of the cooling chamber (15) close to the partition, and a condenser (154) is connected and plugged on the fin (153); one end of the condenser (154) is connected and fixedly connected to the top of the partition; the other end of the condenser (154) is connected and fixedly connected to the bottom end of the partition, and a circulating pump (155) is installed thereon, and a filter is provided between the condenser (154) and the partition.

10. The heat treatment process for a piston rod according to claim 9, characterized in that: A connecting pipe (141) is connected and fixedly connected to the box body (1), one end of the connecting pipe (141) extends to the bottom end of the infiltration chamber (16); the other end of the connecting pipe (141) extends to the top end of the liquid storage chamber (17); a water pump (14) is installed on the connecting pipe (141); a sewage discharge pipe (12) is connected and fixedly connected to the bottom of the infiltration chamber (16), and a sewage discharge valve is installed on the sewage discharge pipe (12); and a liquid inlet pipe (13) is connected and fixedly connected to the top end of the infiltration chamber (16).

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