CN113699346B

CN113699346B - Heat treatment device for piston rod

Info

Publication number: CN113699346B
Application number: CN202111011144.3A
Authority: CN
Inventors: 吴琦; 曹皓杰
Original assignee: Wuxi Jiaxin Mingyou Hydraulic Technology Co ltd
Current assignee: Wuxi Jiaxin Mingyou Hydraulic Technology Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-04-29
Anticipated expiration: 2041-08-31
Also published as: CN113699346A

Abstract

The invention discloses a heat treatment device for a piston rod, which comprises a bearing plate, a heat circulating flow mechanism and a linkage mechanism, wherein a connecting plate is fixed on the outer edge of the surface of the bearing plate, a bearing ring is fixed on the top of the connecting plate, a mounting plate is inserted in the bearing ring in a sliding way, a plurality of limiting pieces are arranged on the surfaces of the mounting plate and the bearing plate, the thermal circulation flow mechanism is arranged between the bearing plate and the connecting plate, the linkage mechanism for driving the piston rods to rotate by the rotation of the bearing plate is arranged at the bottom of the mounting plate, the invention realizes the equal-angle mounting of the piston rods by the designed action of the bearing plate and the limiting piece in the mounting plate, make between not laminating, later rethread thermal cycle flows the mechanism, absorbs the discharge with the hot gas flow of piston rod top and bottom, avoids top and bottom to appear too big difference in temperature and appears warping, also makes the piston rod be heated more even heat treatment quality higher.

Description

Heat treatment device for piston rod

Technical Field

The invention relates to the technical field of heat treatment of piston rods, in particular to a heat treatment device for piston rods.

Background

The piston rod is a connecting component for supporting the piston to do work, most of the piston rod is applied to an oil cylinder and an air cylinder movement executing component, and the piston rod is a movement component with frequent movement and high technical requirements.

The existing piston rod has the following processing route: forging (rolling stock), blanking, quenching and tempering, straightening, machining, surface quenching, tempering, straightening, welding a rod head, machining, grinding, stress relief annealing, polishing, hard chromium plating, polishing, cleaning and assembling, wherein the heat treatment of the piston rod is a key process for ensuring the internal quality and the mechanical property of the piston rod, the quality of the heat treatment is directly related to the service life and the reliability of the whole hydraulic system, if the heat treatment is improper, the piston rod is broken early in the using process, other parts are damaged slightly, and the damage and the casualties of the whole equipment can be caused seriously, at present, when the heat treatment is carried out on the piston rod, a 150KW well type resistance furnace or a 600KW suspension type continuous resistance heating furnace is generally adopted for heating, then the piston rod is extracted for circulating water cooling, and when the piston rod is cooled to 100 ℃, the piston rod is placed into the well type resistance furnace for tempering, therefore, when the piston rod is subjected to heat treatment, the piston rod is generally hoisted and moved, and the conventional heat treatment hoisting methods of the piston rod have two types: 1. the piston rod and other workpieces are mixed, 2, the piston rod is welded and hung by a hook, the hook is hung by a manual gas cutting hook, welding and gas cutting parts are ground, and a large amount of manpower and material resources are wasted, so another method is adopted, but the other method has the defects that no heat circulation flowing space exists among the workpieces, the quenching temperature and the cooling speed are unbalanced due to gravity extrusion among the workpieces, the crystal structure is changed differently, and when local cooling is met, the piston rod is frequently bent, the surface hardness is uneven and the like, so that the heat treatment device for the piston rod is provided.

Disclosure of Invention

The present invention is directed to a heat treatment for a piston rod, which can uniformly heat the piston rod and prevent the piston rod from deforming, so as to solve the problems of the background art mentioned above.

In order to achieve the purpose, the invention provides the following technical scheme: piston rod heat treatment device, including loading board, thermal cycle flow mechanism and link gear, the outer edge of loading board is fixed with the connecting plate, and the connecting plate top is fixed with the carrier ring, the slip grafting has the mounting panel in the carrier ring, and mounting panel and loading board surface mounting have a plurality of locating parts for between loading board and the mounting panel steam circulation be used for avoiding the piston rod about the both ends difference in temperature too big thermal cycle flow mechanism installs between loading board and connecting plate, be used for the loading board rotate drive a plurality of piston rod rotations link gear install in the mounting panel bottom.

Preferably, link gear is including fixing the interior ring gear that bears the weight of the ring inboard, and is a plurality of the locating part is located the mounting panel bottom outside and all is fixed with the drive gear with interior ring gear intermeshing, thermal cycle flows the mechanism and is fixed with the link gear with the mounting panel link outside, and the mounting panel bottom rotates and installs a plurality of change gear with the link gear and a plurality of drive gear meshing, mounting panel fixed surface has the fifth wheel, and the fifth wheel outside cover has the driving band to be connected with drive arrangement through the driving band, link through link gear, make when rotating the mounting panel, can carry out the rotation to a plurality of piston rods and handle, make it more even to be heated.

Preferably, the thermal cycle flow mechanism comprises two circulation cylinders, wherein the circulation cylinders are fixed through connecting rods, the outer ends of the two circulation cylinders are respectively connected with the mounting plate and the bearing plate in a rotating mode, the circulation cylinders are located on the mounting plate, the outer sides of the circulation cylinders are fixed with the transmission gear, the outer sides of the circulation cylinders are sleeved with the moving sleeves in a threaded mode, the thread grooves on the outer sides of the two circulation cylinders are opposite in orientation, a limiting rod is fixed between the mounting plate and the bearing plate, the two ends of the limiting rod are inserted with limiting blocks fixed with the two moving sleeves in a sliding mode, the two ends of the limiting rod are provided with semicircular grooves in an opening mode, heat transfer assemblies are installed in the two circulation cylinders, and the thermal cycle flow mechanism is used for achieving thermal cycle flow, so that the temperatures of the upper end and the lower end of the piston rod are equal, uneven heating is avoided, and stress exists inside the piston rod.

Preferably, the heat transfer assembly comprises a transfer pipe inserted into the circulating cylinder in a sliding mode, a piston plate connected with the inner wall of the circulating cylinder in a sliding mode is fixed to the outer side of the bottom of the transfer pipe, an exhaust ring is communicated with the top of the transfer pipe and is rotatably connected with the moving sleeve through a bearing, an air outlet is formed in the outer side of the exhaust ring, two air inlets are formed in the bottom of the circulating cylinder, an air inlet piece is installed at the position, corresponding to the air inlet, of the inner side of the circulating cylinder, an air outlet piece is installed on the inner side of one end, close to the exhaust ring, of the transfer pipe, high-temperature gas at the top and the bottom of the piston rod is absorbed through the heat transfer assembly, and the high-temperature gas is transmitted to the bottom and the top.

Preferably, the air inlet part comprises an air inlet shell arranged at the position of the air inlet hole, one end of the air inlet shell, which is close to the air inlet hole, is provided with an air inlet, the other end of the air inlet shell is provided with a first port, a first sealing ball is arranged in the air inlet shell, and the air inlet is controlled through the air inlet part.

Preferably, the piece of giving vent to anger is including installing the shell of giving vent to anger in the transfer tube, go out the shell bottom and install the second port, and go out and install the second ball sealer in the shell, it has a plurality of transfer ports to go out to open along the department outside the shell top, realizes the control to giving vent to anger through the piece of giving vent to anger.

Preferably, a plurality of movable rods are rotatably installed between the installation plate and the bearing plate, the movable blocks are sleeved on the outer sides of the movable rods in a threaded manner, a preheating frame is fixed to the inner sides of the plurality of movable blocks, the tops of the plurality of movable rods are respectively fixed with a movable gear meshed with the plurality of transmission gears, a heating plate is installed at the upper end of the inner side of the preheating frame, a plurality of nozzles are communicated with the lower end of the inner side of the preheating frame, a water inlet nozzle is communicated with the outer side of the preheating frame, the piston rod can be preheated before being heated through the preheating frame, and the cooling is more uniform due to the fact that water can be sprayed circularly when the cooling is carried out.

Preferably, the locating part includes seat ring and connecting seat, seat ring and connecting seat rotate respectively and install on mounting panel and loading board, and seat ring bottom is fixed mutually with drive gear, the wheel that supports that is used for the piston rod spacing is all installed to seat ring and connecting seat inboard, realizes spacing the extrusion of piston rod through supporting the wheel for installation to the piston rod is more stable.

Preferably, the bearing plate for moving and supporting is fixed on the outer side of the bearing ring, so that the piston rod can be conveniently pulled out and moved and placed by personnel through heat treatment.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, through the action of the designed bearing plate and the limiting piece in the mounting plate, the piston rods are mounted at equal angles, so that the piston rods are not attached to each other, and then hot air at the top and the bottom of the piston rods is absorbed and discharged through the heat circulation flow mechanism, so that deformation caused by excessive temperature difference at the top and the bottom is avoided, and the piston rods are heated more uniformly and have higher heat treatment quality.

Drawings

FIG. 1 is a schematic view of the overall structure of the piston rod of the present invention after insertion;

FIG. 2 is a schematic view of another angle of the piston rod according to the present invention;

FIG. 3 is a schematic view of a linkage mechanism according to the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

FIG. 5 is a schematic view of the position relationship between the preheating frame and the plurality of movable rods according to the present invention;

FIG. 6 is a schematic structural view of a thermal circulation flow mechanism according to the present invention;

FIG. 7 is a partial cross-sectional structural schematic view of a thermal circulation flow mechanism of the present invention;

FIG. 8 is an enlarged view of FIG. 7 at B;

FIG. 9 is a schematic view of the connection between the piston plate and the circulation cylinder according to the present invention;

FIG. 10 is a cross-sectional view showing the internal structure of the circulation cylinder according to the present invention;

fig. 11 is an enlarged view of fig. 10 at C.

In the figure: 1-a carrier plate; 2-connecting plates; 3-a carrier ring; 4-mounting a plate; 5-a limiting part; 6-a thermal circulation flow mechanism; 7-a linkage mechanism; 8-inner gear ring; 9-a transmission gear; 10-a linkage gear; 11-a speed change gear; 12-a fifth wheel; 13-a drive belt; 14-a circulation cylinder; 15-moving the sleeve; 16-a limiting rod; 17-a limiting block; 18-a heat transfer assembly; 19-a transfer tube; 20-a piston plate; 21-a venting ring; 22-air outlet holes; 23-an air intake; 24-an air intake; 25-a gas outlet member; 26-an air inlet shell; 27-an air inlet; 28-a first port; 29-a first sealing ball; 30-an air outlet shell; 31-a second port; 32-a second sealing ball; 33-a transfer port; 34-a moving rod; 35-a moving block; 36-a preheating frame; 37-a moving gear; 38-heating plate; 39-a nozzle; 40-water inlet nozzle; 41-a seating ring; 42-a connecting seat; 43-a thrust wheel; 44-bearing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1-4 and 6-11, the heat treatment apparatus for piston rods in the drawings comprises a bearing plate 1, a heat circulation flowing mechanism 6 and a linkage mechanism 7, wherein a connecting plate 2 is fixed on the outer edge of the surface of the bearing plate 1, a bearing ring 3 is fixed on the top of the connecting plate 2, a mounting plate 4 is inserted in the bearing ring 3 in a sliding manner, a plurality of limiting members 5 are installed on the surfaces of the mounting plate 4 and the bearing plate 1, the heat circulation flowing mechanism 6 for hot air circulation between the bearing plate 1 and the mounting plate 4 to avoid the excessive temperature difference between the upper end and the lower end of the piston rod is installed between the bearing plate 1 and the connecting plate 2, and the linkage mechanism 7 for driving the rotation of the plurality of piston rods by the bearing plate 1 is installed at the bottom of the mounting plate 4.

Wherein, link gear 7 is including fixing at the inboard interior ring gear 8 of carrier ring 3, and is a plurality of locating part 5 is located the mounting panel 4 bottom outside and all is fixed with the drive gear 9 with interior ring gear 8 intermeshing, thermal cycle flow mechanism 6 is fixed with link gear 10 with the mounting panel 4 link outside, and the mounting panel 4 bottom is rotated and is installed a plurality of change gear 11 with the meshing of link gear 10 and a plurality of drive gear 9, mounting panel 4 fixed surface has

fifth wheel

12, and 12 outside covers of fifth wheel have driving band 13 to be connected with drive arrangement through driving band 13.

In addition, the thermal circulation flowing mechanism 6 comprises two circulation cylinders 14, the two circulation cylinders 14 are fixed through connecting rods, the outer ends of the two circulation cylinders 14 are respectively connected with the mounting plate 4 and the bearing plate 1 in a rotating mode, the outer side of each circulation cylinder 14 located on the mounting plate 4 is fixed with the transmission gear 9, the outer sides of the two circulation cylinders 14 are sleeved with the moving sleeves 15 in a threaded mode, the outer sides of the two circulation cylinders 14 are provided with reciprocating threaded grooves in opposite directions in a carving mode, a limiting rod 16 is fixed between the mounting plate 4 and the bearing plate 1, two ends of the limiting rod 16 are connected with limiting blocks 17 fixed with the two moving sleeves 15 in a sliding and inserting mode, the outer sides of the two circulation cylinders 14 are provided with semi-circular grooves, and heat transfer assemblies 18 are installed in the two circulation cylinders 14.

The heat transfer component 18 comprises a transfer pipe 19 inserted in the circulation barrel 14 in a sliding manner, a piston plate 20 connected with the inner wall of the circulation barrel 14 in a sliding manner is fixed on the outer side of the bottom of the transfer pipe 19, an exhaust ring 21 is communicated with the top of the transfer pipe 19, the exhaust ring 21 is rotatably connected with the movable sleeve 15 through a bearing, an air outlet 22 is formed in the outer side of the exhaust ring 21, two air inlets 23 are formed in the bottom of the circulation barrel 14, an air inlet piece 24 is installed on the inner side of the circulation barrel 14 corresponding to the positions of the air inlets 23, and an air outlet piece 25 is installed on the inner side of one end, close to the exhaust ring 21, of the transfer pipe 19.

The air inlet part 24 comprises an air inlet shell 26 arranged at the position of the air inlet hole 23, one end of the air inlet shell 26 close to the air inlet hole 23 is provided with an air inlet 27, the other end of the air inlet shell 26 is provided with a first port 28, and a first sealing ball 29 is arranged in the air inlet shell 26;

simultaneously, go out the gas piece 25 including installing the shell 30 of going out in transfer pipe 19, go out the shell 30 bottom and install second port 31, and go out and install second ball sealer 32 in the shell 30, it has a plurality of transfer ports 33 to go out to open along the department outward on shell 30 top.

The principle of uniform heating during heat treatment of the piston rod is as follows: firstly, a plurality of piston rods are sequentially plugged into a plurality of limiting parts 5 by personnel, then a lifting tool such as a crane is used for installing the bearing ring 3 in the well-type resistance furnace, then an external driving device is used for driving the driving belt 13 to rotate, so that the connecting wheel 12 rotates, the plurality of transmission gears 9 on the connecting wheel 12 rotate, the piston rods rotate along the installation plate 4 in the well-type resistance furnace and rotate per se, then the speed change gear 11 drives the linkage gear 10 to rotate, so that the two circulation cylinders 14 rotate, the moving sleeves 15 which are sleeved outside the circulation cylinders 14 in a threaded manner start to move in opposite directions, the exhaust rings 21 are driven to move, the transfer pipes 19 are pumped, when the transfer pipes 19 are pumped outwards along the circulation cylinders 14, the piston plates 20 are driven to move outwards, so that the inside of the circulation cylinders 14 is in a negative pressure state, so as to suck the second sealing ball 32 in the air outlet 25 and block the second port 31, and at the same time, the first sealing ball 29 in the air inlet 24 also blocks the first port 28 by sucking air, at this time, the air inlet 23 at the bottom end of the circulation tube 14 starts to absorb nearby hot air, so that the circulation tube 14 is filled with the hot air, because the outside of the circulation tube 14 is a reciprocating threaded groove, the circulation tube 14 moves to the end of the circulation tube 14 through the moving sleeve 15 to move in the opposite direction, at this time, the piston plate 20 starts to be extruded through the transfer tube 19, so that the hot air in the circulation tube 14 is extruded, at this time, the second sealing ball 32 in the air outlet 25 is moved upwards by the air pressure, and at the same time, the first sealing ball 29 is pressed against the air pressure to the air inlet 23 and the air inlet 27, so that the hot air in the circulation tube 14 can only be transmitted into the air exhaust ring 21 through the transfer port 33 and exhausted through the air outlet 22, thereby realizing that the hot air at the bottom of the piston rod is led to the top end, meanwhile, hot air at the top is guided to the bottom end, so that the upper end and the lower end of the piston rod are uniformly heated.

Example 2

Referring to fig. 3 and 5, in this embodiment, a piston rod heat treatment apparatus is further described in embodiment 1, and the illustrated piston rod heat treatment apparatus includes a bearing plate 1, a heat cycle flow mechanism 6 and a linkage mechanism 7, wherein a connecting plate 2 is fixed on an outer edge of a surface of the bearing plate 1, a bearing ring 3 is fixed on a top of the connecting plate 2, a mounting plate 4 is slidably inserted into the bearing ring 3, a plurality of limiting members 5 are installed on surfaces of the mounting plate 4 and the bearing plate 1, the heat cycle flow mechanism 6 for hot gas circulation between the bearing plate 1 and the mounting plate 4 to avoid an excessive temperature difference between upper and lower ends of a piston rod is installed between the bearing plate 1 and the connecting plate 2, and the linkage mechanism 7 for the bearing plate 1 to rotate and drive the plurality of piston rods to rotate is installed at a bottom of the mounting plate 4;

the linkage mechanism 7 comprises an inner toothed ring 8 fixed on the inner side of the bearing ring 3, transmission gears 9 meshed with the inner toothed ring 8 are fixed on the outer sides of the bottoms of the mounting plates 4 of the limiting pieces 5, linkage gears 10 are fixed on the outer sides of the connecting ends of the thermal circulation flow mechanism 6 and the mounting plates 4, a plurality of speed change gears 11 meshed with the linkage gears 10 and the transmission gears 9 are rotatably mounted at the bottoms of the mounting plates 4, connecting wheels 12 are fixed on the surfaces of the mounting plates 4, and driving belts 13 are sleeved on the outer sides of the connecting wheels 12 and connected with driving equipment through the driving belts 13;

in addition, a plurality of moving rods 34 are rotatably installed between the mounting plate 4 and the bearing plate 1, moving blocks 35 are sleeved on the outer sides of the moving rods 34 in a threaded manner, preheating frames 36 are fixed on the inner sides of the moving blocks 35, moving gears 37 meshed with the transmission gears 9 are fixed on the tops of the moving rods 34, a heating plate 38 is installed at the upper end of the inner side of each preheating frame 36, the lower end of the inner side of each preheating frame is communicated with a plurality of nozzles 39, and a water inlet nozzle 40 is communicated with the outer side of each preheating frame 36.

In this embodiment, when mounting panel 4 carries out the pivoted, can drive gear 9 and rotate, it rotates to drive simultaneously and remove gear 37, make the carriage release lever 34 rotate, it reciprocates to drive preheating frame 36, make when carrying out thermal treatment to the piston rod outside, preheat in advance earlier, make during the follow-up heating, the difference in temperature change can not be too big, make the thermal treatment quality more, finishing at thermal treatment, when shifting out from well formula resistance furnace and cooling, can spray water through 40 intercommunication water pipes of intake nozzle, make the water spray more even, the cooling effect is more.

Example 3

Referring to fig. 1-3, the heat treatment apparatus for piston rods in the figures of the present embodiment is further described with respect to other embodiments, and includes a bearing plate 1, a heat circulation flowing mechanism 6 and a linkage mechanism 7, wherein a connecting plate 2 is fixed on an outer edge of a surface of the bearing plate 1, a bearing ring 3 is fixed on a top of the connecting plate 2, a mounting plate 4 is slidably inserted into the bearing ring 3, a plurality of limiting members 5 are installed on surfaces of the mounting plate 4 and the bearing plate 1, the heat circulation flowing mechanism 6 for hot air circulation between the bearing plate 1 and the mounting plate 4 to avoid an excessive temperature difference between upper and lower ends of the piston rods is installed between the bearing plate 1 and the connecting plate 2, and the linkage mechanism 7 for the bearing plate 1 to rotate and drive the piston rods to rotate is installed at a bottom of the mounting plate 4.

The limiting member 5 includes a seat ring 41 and a connecting seat 42, the seat ring 41 and the connecting seat 42 are respectively rotatably mounted on the mounting plate 4 and the bearing plate 1, the bottom of the seat ring 41 is fixed to the transmission gear 9, the inner sides of the seat ring 41 and the connecting seat 42 are respectively provided with a supporting wheel 43 for limiting the piston rod, and meanwhile, a bearing plate 44 for moving and supporting is fixed to the outer side of the bearing ring 3 for facilitating butt joint.

In this embodiment, the supporting wheel 43 designed in the limiting part 5 is used for limiting the piston rod, and simultaneously, the surface contact of the piston rod can be more stable, and the designed bearing plate 44 is used for limiting the piston rod when the piston rod is installed on a well-type resistance furnace and well matching with a hoisting device for hoisting.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Piston rod heat treatment equipment, its characterized in that includes:

the bearing plate comprises a bearing plate (1), wherein a connecting plate (2) is fixed on the outer edge of the surface of the bearing plate (1), a bearing ring (3) is fixed on the top of the connecting plate (2), a mounting plate (4) is inserted in the bearing ring (3) in a sliding manner, and a plurality of limiting pieces (5) are arranged on the surfaces of the mounting plate (4) and the bearing plate (1);

the heat circulation flow mechanism (6) is used for hot gas circulation between the bearing plate (1) and the mounting plate (4) so as to prevent the heat circulation flow mechanism (6) with the overlarge temperature difference between the upper end and the lower end of the piston rod from being mounted between the bearing plate (1) and the connecting plate (2);

the linkage mechanism (7) is used for installing the linkage mechanism (7) which drives a plurality of piston rod autorotations through rotation of the bearing plate (1) at the bottom of the installation plate (4), the linkage mechanism (7) comprises an inner gear ring (8) fixed on the inner side of the bearing ring (3), a plurality of limiting parts (5) are arranged on the outer side of the bottom of the installation plate (4) and are respectively provided with a transmission gear (9) meshed with the inner gear ring (8), a linkage gear (10) is fixed on the outer side of the connecting end of the thermal circulation flow mechanism (6) and the installation plate (4), a plurality of speed change gears (11) meshed with the linkage gear (10) and the transmission gears (9) are installed at the bottom of the installation plate (4) in a rotating way, a connecting wheel (12) is fixed on the surface of the installation plate (4), a driving belt (13) is sleeved on the outer side of the connecting wheel (12) and is connected with a driving device through the driving belt (13), the heat circulation flow mechanism (6) comprises two circulation cylinders (14), the two circulation cylinders (14) are fixed through a connecting rod, the outer ends of the two circulation cylinders (14) are respectively rotatably connected with the mounting plate (4) and the bearing plate (1), the outer sides of the circulation cylinders (14) positioned on the mounting plate (4) are fixed with the transmission gear (9), the outer sides of the two circulation cylinders (14) are respectively sleeved with a movable sleeve (15) in a threaded manner, the outer side thread grooves of the two circulation cylinders (14) face opposite directions, a limiting rod (16) is fixed between the mounting plate (4) and the bearing plate (1), two ends of the limiting rod (16) are respectively inserted with a limiting block (17) fixed with the two movable sleeves (15) in a sliding manner, the outer sides of the two circulation cylinders (14) are provided with semicircular grooves, heat transfer assemblies (18) are respectively arranged in the two circulation cylinders (14), and each heat transfer assembly (18) comprises a transfer pipe (19) inserted in the circulation cylinder (14) in a sliding manner, a piston plate (20) which is in sliding connection with the inner wall of the circulating cylinder (14) is fixed on the outer side of the bottom of the transferring pipe (19), an exhaust ring (21) is communicated with the top of the transferring pipe (19), the exhaust ring (21) is rotatably connected with the moving sleeve (15) through a bearing, an air outlet hole (22) is formed in the outer side of the exhaust ring (21), two air inlet holes (23) are formed in the bottom of the circulating cylinder (14), an air inlet piece (24) is installed on the inner side of the circulating cylinder (14) corresponding to the positions of the air inlet holes (23), an air outlet piece (25) is installed on the inner side of one end, close to the exhaust ring (21), of the transferring pipe (19), the air inlet piece (24) comprises an air inlet shell (26) installed on the positions of the air inlet holes (23), an air inlet (27) is formed in one end, close to the air inlet hole (23), a first port (28) is formed in the other end of the air inlet shell (26), and a first sealing ball (29) is installed in the air inlet shell (26), go out gas spare (25) including installing in air outlet shell (30) in transfer pipe (19), air outlet shell (30) bottom is installed second port (31), and installs second ball sealer (32) in air outlet shell (30), air outlet shell (30) top is outer to be opened along the department has a plurality of transfer ports (33).

2. The piston rod heat treatment apparatus according to claim 1, wherein: rotate between mounting panel (4) and loading board (1) and install a plurality of movable rod (34), it is a plurality of movable rod (34) outside screw thread sleeve has movable block (35), and a plurality of movable block (35) inboard is fixed with preheats frame (36), and is a plurality of movable rod (34) top all is fixed with movable gear (37) with a plurality of drive gear (9) engaged with, preheat frame (36) inboard upper end and install hot plate (38), and inboard lower extreme intercommunication has a plurality of nozzles (39), it has water intake (40) to preheat frame (36) outside intercommunication.

3. The piston rod heat treatment apparatus according to claim 2, wherein: the limiting piece (5) comprises a seat ring (41) and a connecting seat (42), the seat ring (41) and the connecting seat (42) are respectively rotatably installed on the installation plate (4) and the bearing plate (1), the bottom of the seat ring (41) is fixed with the transmission gear (9), and the inner sides of the seat ring (41) and the connecting seat (42) are respectively provided with a supporting wheel (43) for limiting the piston rod.

4. The piston rod heat treatment apparatus according to claim 3, wherein: and a bearing plate (44) for moving and supporting is fixed on the outer side of the bearing ring (3).