Engine piston processing heat treatment equipment

Abstract

The present invention relates to the field of piston processing heat treatment technology, specifically an engine piston processing heat treatment equipment, including a bottom support plate, a permeation furnace is fixed to the top of the bottom support plate through a vertical column, a top plate is fixed to the permeation furnace through U-shaped rods symmetrically distributed on the left and right sides, a capping clamping unit is arranged at the bottom of the top plate, a plurality of positioning units are evenly arranged circumferentially in the permeation furnace, ventilation units are arranged in the permeation furnace and on both sides of each positioning unit close to and away from the center of the permeation furnace, ventilation holes are symmetrically arranged on the sides of the permeation furnace, and a ventilation cavity for ventilating each ventilation unit is arranged in the permeation furnace. The present invention is provided with a ventilation unit, which can not only ventilate the piston hole position in a targeted manner, but also the setting of the ball can not only separate the limit through pipe and the inside of the piston hole to facilitate gas infiltration into the piston hole wall, but also cooperate with the positioning unit to make the piston swing perpendicular to the radial direction of the bottom of the permeation furnace.

Description

Technical Field

[0001] The invention relates to the technical field of piston processing heat treatment, in particular to engine piston processing heat treatment equipment. Background Art

[0002] The engine piston is one of the important components in the automobile engine. Its main function is to reciprocate in the cylinder, and together with the cylinder head and cylinder wall, it forms a combustion chamber to complete the four strokes of intake, compression, power and exhaust. Fig.11 As shown, the piston is mainly composed of a main body, a hole in the main body, and an ear seat at the bottom of the main body. Since the engine piston needs to maintain excellent performance under the working environment, it is necessary to perform proper heat treatment on the engine piston, and proper heat treatment of the engine piston can also extend the service life of the engine and improve its overall efficiency.

[0003] The actual heat treatment process for engine pistons is mainly divided into quenching, tempering and surface hardening treatment, and the most common surface hardening treatment is penetration treatment. The existing method of penetration treatment for pistons is mainly to stack the pistons and place them in a preheated pit furnace through a placement rack, and then introduce carbon-containing gas into the pit furnace, so that the carbon element in the gas adheres to the piston surface and penetrates into the piston surface.

[0004] Although the above method can efficiently carburize the piston, since there are holes in the piston, it is difficult for the holes to be in contact with the carbon-containing gas at the same time as other surfaces of the piston, which results in insufficient carburizing depth of the inner hole wall of the piston, resulting in poor position performance of the internal hole of the piston after carburizing, thereby affecting the use of the piston; in addition, since the piston is stationary in the pit furnace, the carbon-containing gas introduced diffuses slowly, resulting in slow contact between the piston and the carbon-containing gas, thereby affecting the carburizing efficiency of the piston. Summary of the invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an engine piston processing heat treatment equipment, including a bottom support plate, an infiltration furnace is fixed on the top of the bottom support plate through a vertical column, a top plate is fixed on the infiltration furnace through U-shaped rods symmetrically distributed on the left and right sides, a sealing clamping unit is arranged at the bottom of the top plate, a plurality of positioning units are evenly arranged circumferentially in the infiltration furnace, ventilation units are arranged on both sides of the infiltration furnace and each positioning unit is respectively located close to and away from the center of the infiltration furnace, ventilation holes are symmetrically arranged on the sides of the infiltration furnace, and a ventilation cavity for ventilating each ventilation unit is arranged in the infiltration furnace; the sealing clamping unit includes a No. 1 cylinder fixed to the bottom of the top plate, a cover plate is fixed to the pushing end of the No. 1 cylinder, an embedded ring is fixed to the bottom of the cover plate, an engaging groove matching the embedded ring is arranged on the top of the infiltration furnace, and a plurality of A clamping element corresponding to the position of the positioning unit is used to clamp the piston; the clamping element is synchronously clamped by a synchronous element arranged on the top of the cover plate; the positioning unit includes a positioning column fixed in the infiltration furnace, the positioning column is symmetrically fixed with L-shaped fixing rods on both sides of the radial direction perpendicular to the bottom of the infiltration furnace, a rotating rod is hinged on the top of the positioning column, the rotating rod is symmetrically provided with synchronous pushing elements on both sides of the radial direction perpendicular to the bottom of the infiltration furnace, an inner pushing rod is fixed on the top of the rotating rod, and an upward pushing element for cooperating with the synchronous pushing element to push the rotating rod is rotatably installed on the side of the positioning column; the ventilation unit includes an L-shaped ventilation column fixed in the infiltration furnace, a telescopic limit element is slidably connected in the horizontal section of the L-shaped ventilation column; a power element for controlling two adjacent telescopic limit elements to perform synchronous telescopic extension and retraction is arranged on the L-shaped fixing rod.

[0006] Preferably, the clamping element includes an outer sleeve column vertically slidably connected to the middle part of the cover plate, and a group of track plates are symmetrically fixed on the outer sleeve column perpendicular to the radial sides along the bottom of the infiltration furnace, and each track plate is provided with a track groove. The outer sleeve column is a hollow structure, and a center rod is slidably connected inside the outer sleeve column.

[0007] Preferably, a semicircular rod is slidably connected to the position corresponding to each group of track plates in the center rod, and the two semicircular rods can fit together to form a circular rod; avoidance grooves are provided on the side of the outer sleeve column and at the positions corresponding to the semicircular rods, and a track rod is fixed at one end of each semicircular rod away from the center rod, and clamps are fixed at both ends of the track rod located on the outside of the corresponding track plate, and the clamps are used to clamp the bottom of the piston.

[0008] Preferably, the synchronization element includes two synchronization rings which are arranged on all and the top of the center rod and on the side of the outer sleeve column of the top of the center rod and are staggered up and down; an L-shaped front plate is fixed on the rear side of the top of the cover plate, and the bottom of the longitudinal section of the L-shaped front plate is fixed with front and rear staggered No. 2 cylinder and No. 3 cylinder, the push end of the No. 2 cylinder is connected to the synchronization ring on the lower side, and the push end of the No. 3 cylinder is connected to the synchronization ring on the upper side.

[0009] Preferably, the synchronous pushing element includes a square telescopic rod fixed on the radial side of the rotating rod perpendicular to the bottom of the infiltration furnace, and a push rod is hinged at the bottom of the telescopic end of the square telescopic rod, and the push rod passes through the non-vertical section of the L-shaped fixed rod.

[0010] Preferably, the pushing element includes a rotating ring rotatably installed at the bottom of the infiltration furnace, a pushing protrusion and a giving way groove are arranged at the top of the rotating ring corresponding to the position of the pushed rod, the connecting line of the pushing protrusion and the giving way groove passes through the center position of the positioning column, the bottom of the rotating ring passes through the bottom of the infiltration furnace, and a synchronous column is fixed to the bottom of the rotating ring; a power motor is installed on the top of the bottom support plate through a motor box, and a transmission belt is jointly provided on the output end of the power motor and all the synchronous columns.

[0011] Preferably, the telescopic limiting element includes a ventilation sleeve slidably connected in a non-vertical section of an L-shaped ventilation column, the ventilation sleeve is perpendicular to limit rods symmetrically fixed on both sides of the radial direction along the bottom of the permeation furnace, and a limit groove cooperating with the limit rod is provided on the horizontal section of the L-shaped ventilation column, and a limit tube is installed at one end of two adjacent ventilation sleeves close to each other, and a plurality of groups of circular arrays of balls are linearly arranged on the side surface of the limit tube, and a plurality of groups of circular arrays of through holes are linearly arranged at the position where the side surface of the limit tube is staggered with the balls.

[0012] Preferably, the power element includes a slide rail fixed on an L-shaped fixed rod, a push block is slidably connected to the slide rail, the sides of the push block close to the limit rods on the two telescopic limit elements are hinged with connecting rods, a driving rod is rotatably installed between the end of the connecting rod away from the push block and the limit rods at the corresponding position; a penetrating rod that penetrates the bottom of the infiltration furnace is fixed at the bottom of the push block, and a tension ring is commonly connected to the bottom of all the penetrating rods; a No. 4 cylinder is fixed to the top of the bottom support plate, and the push end of the No. 4 cylinder is connected to the tension ring.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention is provided with a ventilation unit, which can not only ventilate the piston hole position in a targeted manner, but also limit the piston with a limiting through tube, and simultaneously cooperate with the positioning unit to fix the position of the piston. After the piston position is fixed, the piston hole position can be ventilated with the through hole set on the limiting through tube. In addition, the setting of the ball can not only separate the limiting through tube and the inside of the piston hole to facilitate the gas to penetrate into the piston hole wall, but also cooperate with the positioning unit to make the piston swing perpendicular to the radial direction of the bottom of the permeation furnace.

[0014] 2. The present invention adopts a positioning unit in cooperation with a ventilation unit to position the piston, and the synchronous pushing element and the upward pushing element cooperate with each other so that the piston can swing radially perpendicular to the bottom of the infiltration furnace after positioning is completed, thereby facilitating the ventilation unit to carry out targeted and uniform ventilation of the hole position of the piston, while increasing the contact between the piston and the carbon-containing gas, and due to the swing of the piston, the carbon-containing gas in the infiltration furnace can also be stirred, so that the distribution of the carbon-containing gas is more uniform and the flow of the carbon-containing gas is increased, thereby increasing the carburizing efficiency of the piston.

[0015] 3. The present invention adopts a clamping element to position and clamp the piston, mainly by clamping the piston with claws, and clamping the ear seat at the bottom of the piston between the claws at both ends of the same track rod, so as to facilitate the ventilation unit to locate the hole position of the piston, and because the outer sleeve column and the center rod can be controlled by the synchronization element, the piston can be quickly released, so as to facilitate the carbon-containing gas to fully and comprehensively contact the piston surface, and then facilitate the carbon element to fully and comprehensively penetrate into the piston surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a partial cross-sectional view of the present invention after the side wall of the infiltration furnace is removed.

[0019] Figure 3 It is a structural schematic diagram of the top plate and the cover clamping unit in the present invention.

[0020] Figure 4 It is a schematic structural diagram of the clamping element in the present invention.

[0021] Figure 5 It is a partial cross-sectional view of the clamping element in the present invention.

[0022] Figure 6 It is a partial cross-sectional view of the infiltration furnace, the positioning unit and the ventilation unit in the present invention.

[0023] Figure 7 It is a partial cross-sectional view of the infiltration furnace of the present invention with half of the bottom cut away and the positioning unit and the ventilation unit.

[0024] Figure 8 It is a partial cross-sectional view of the positioning unit and the ventilation unit in the present invention.

[0025] Fig. 9 yes Figure 8 Enlarged view of point A in the middle.

[0026] Fig.10 yes Figure 8 Enlarged view of point B in the middle.

[0027] Fig.11 It is a schematic diagram of the structure of the piston.

[0028] In the figure: 1, bottom support plate; 11, vertical column; 12, infiltration furnace; 121, vent hole; 13, top plate; 14, ventilation cavity; 2, capping clamping unit; 21, No. 1 cylinder; 211, cover plate; 22, clamping element; 221, outer sleeve column; 222, track plate; 223, middle rod; 224, semicircular rod; 225, track rod; 226, clamping claw; 23, synchronization element; 231, synchronization ring; 232, L-shaped front plate; 233, No. 2 cylinder; 234, No. 3 cylinder; 3, positioning unit; 31, positioning column; 311, L-shaped fixed rod; 312, rotating rod; 313, inner push rod; 32, Synchronous pushing element; 321, square telescopic rod; 322, pushed rod; 33, pushing element; 331, rotating ring; 332, pushing protrusion; 333, giving way groove; 334, synchronous column; 335, power motor; 336, transmission belt; 4, ventilation unit; 41, L-shaped ventilation column; 42, telescopic limiting element; 421, ventilation sleeve; 422, limiting rod; 423, limiting through pipe; 424, ball; 425, through hole; 43, power element; 431, slide rail; 432, pushed block; 433, connecting rod; 434, driving rod; 435, through rod; 436, tension ring; 437, No. 4 cylinder. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in the art or the product specifications are used.

[0030] See also Figure 1 , Figure 2 and Figure 7 , an engine piston processing heat treatment equipment, including a bottom support plate 1, an infiltration furnace 12 is fixed on the top of the bottom support plate 1 through a vertical column 11, a top plate 13 is fixed on the infiltration furnace 12 through U-shaped rods symmetrically distributed on the left and right sides, a sealing clamping unit 2 is arranged at the bottom of the top plate 13, a plurality of positioning units 3 are evenly arranged circumferentially in the infiltration furnace 12, ventilation units 4 are arranged in the infiltration furnace 12 and on both sides of each positioning unit 3 close to and away from the center of the infiltration furnace 12, ventilation holes 121 are symmetrically arranged on the side of the infiltration furnace 12, and a ventilation cavity 14 for ventilating each ventilation unit 4 is arranged in the infiltration furnace 12.

[0031] The present invention positions the piston and loads it into the infiltration furnace 12 while sealing the infiltration furnace 12 through the sealing clamping unit 2, and the positioning unit 3 can cooperate with the sealing clamping unit 2 to accurately position the piston, and the vent hole 121, the vent cavity 14 and the vent unit 4 are used to evenly introduce the carbon-containing gas, so that the carbon element can evenly penetrate into all surfaces of the piston during the carburizing process, thereby achieving the purpose of improving the surface hardness and wear resistance of the piston workpiece.

[0032] Specifically, the operator first places multiple pistons at the position of the capping clamping unit 2, and positions and clamps the pistons through the capping clamping unit 2, then continuously heats the inside of the infiltration furnace 12 until it is heated to a specified temperature, and then controls the capping clamping unit 2 to seal the top of the infiltration furnace 12. At this time, the pistons will move deeper into the infiltration furnace 12 with the movement of the capping clamping unit 2 and move to the positions of the positioning unit 3 and the ventilation unit 4. At this time, the ventilation unit 4 and the positioning unit 3 are controlled to jointly position the pistons, and the capping clamping unit 2 is controlled to release the clamping of the pistons, and carbon-containing gas is introduced into the infiltration furnace 12 through the vent hole 121 and the ventilation cavity 14 at the same time. At this time, the gas in the ventilation cavity 14 will simultaneously pass from the ventilation unit 4 to the piston hole wall, so that the piston surface is evenly carburized.

[0033] It should be noted that a heating device for continuous heating and heat preservation is provided in the infiltration furnace 12. Since such a device is relatively common and widely used in the infiltration process, it will not be described in detail.

[0034] See also Figure 3 and Figure 4 The capping clamping unit 2 includes a No. 1 cylinder 21 fixed at the bottom of the top plate 13, a cover plate 211 is fixed to the pushing end of the No. 1 cylinder 21, an embedded ring is fixed to the bottom of the cover plate 211, and an engaging groove matching the embedded ring is arranged on the top of the infiltration furnace 12. A plurality of clamping elements 22 corresponding to the positions of the positioning units 3 are evenly arranged in the circumferential direction in the cover plate 211, and the clamping elements 22 are used to clamp the piston; the clamping elements 22 are synchronously clamped by a synchronization element 23 arranged on the top of the cover plate 211.

[0035] The sealing clamping unit 2 is used to seal the top of the infiltration furnace 12, so that the infiltration furnace 12 is in a closed state during the infiltration process, and can cooperate with the clamping element 22 and the synchronization element 23 to clamp the piston and place it into the infiltration furnace 12. Specifically, the operator first places the pistons one by one on the clamping element 22, and then controls the synchronization element 23 to drive the clamping element 22 to position the piston, and then controls the No. 1 cylinder 21 to push the cover plate 211 downward until the embedded ring at the bottom of the cover plate 211 cooperates with the interlocking groove on the top of the infiltration furnace 12 and completes the closure of the top of the infiltration furnace 12. During this process, the piston moves downward and moves to the position of the positioning unit 3 and the ventilation unit 4.

[0036] See also Figure 3-Figure 5 The clamping element 22 includes an outer sleeve column 221 vertically slidably connected to the middle part of the cover plate 211, and the outer sleeve column 221 is symmetrically fixed with a group of track plates 222 on both sides perpendicular to the radial direction along the bottom of the infiltration furnace 12, and each track plate 222 is provided with a track groove. The outer sleeve column 221 is a hollow structure, and a center rod 223 is slidably connected to the outer sleeve column 221; a semicircular rod 224 is slidably connected to the position of each group of track plates 222 in the center rod 223, and the two semicircular rods 224 can fit together to form a circular rod; an avoidance groove is provided on the side of the outer sleeve column 221 and at the position corresponding to the semicircular rod 224, and a track rod 225 is fixed to the end of each semicircular rod 224 away from the center rod 223, and clamps 226 are fixed to the two ends of the track rod 225 located on the outer side of the corresponding track plate 222, and the clamps 226 are used to clamp the bottom of the piston.

[0037] The clamping element 22 is used to position and clamp the piston, mainly by clamping the piston through the claws 226, and clamping the ear seat at the bottom of the piston between the claws 226 at both ends of the same track rod 225, so as to facilitate the ventilation unit 4 to locate the hole position of the piston, and because the outer sleeve column 221 and the center rod 223 can be controlled by the synchronization element 23, the piston can be quickly released, so as to facilitate the carbon-containing gas to fully and comprehensively contact the piston surface, and then facilitate the carbon element to fully and comprehensively penetrate into the piston surface.

[0038] See also Figure 3 The synchronization element 23 includes two synchronization rings 231 which are arranged on the top of all the middle rods 223 and the side of the outer sleeve column 221 and are staggered up and down; an L-shaped front plate 232 is fixed to the rear side of the top of the cover plate 211, and a No. 2 cylinder 233 and a No. 3 cylinder 234 which are staggered front and rear are fixed to the bottom of the longitudinal section of the L-shaped front plate 232. The push end of the No. 2 cylinder 233 is connected to the synchronization ring 231 located on the lower side, and the push end of the No. 3 cylinder 234 is connected to the synchronization ring 231 located on the upper side.

[0039] The synchronization element 23 is used to control the clamping and contact clamping of the clamping element 22, and the method of synchronously controlling the clamping and releasing of all the clamping elements 22 with a No. 2 cylinder 233 and a No. 3 cylinder 234 can reduce the preparation time before penetration, thereby improving the piston penetration efficiency of batches.

[0040] Specifically, first, place the pistons corresponding to the number of clamping elements 22 at the bottom of the center rod 223 one by one, and adjust the position of the piston so that the ear seat of the piston faces the clamping claws 226 at both ends of the same track rod 225, then control the No. 3 cylinder 234 to drive the synchronization ring 231 and the center rod 223 to move upward synchronously, at this time the center rod 223 will drive the semicircular rod 224 to move upward, at this time the two semicircular rods 224 will drive the track rod 225 to move upward, as the track rod 225 moves upward, the track rod 225 will cooperate with the track plate 222 and move toward the piston, when the track rod 225 moves to the uppermost end of the track groove, the clamping claw 226 will move with the track rod 225 and clamp the piston, and can accurately clamp the ear seat of the piston between the clamping claws 226 at both ends of the same track rod 225, thereby completing the positioning and clamping of the piston.

[0041] After the subsequent ventilation unit 4 cooperates with the positioning unit 3 to limit the position of the hole on the piston, first control the No. 3 cylinder 234 to drive the synchronization ring 231 and the outer sleeve column 221 to move upward. At this time, the track plate 222 moves upward synchronously with the outer sleeve column 221, and due to the cooperation of the track plate 222 and the track rod 225, the track rod 225 moves away from the piston. At this time, the clamp 226 will release the clamping effect on the piston. After the clamp 226 is completely separated from the piston, control the No. 2 cylinder 233 and the No. 3 cylinder 234 to synchronously drive the upper and lower synchronization rings 231 upward, thereby completely releasing the positioning effect on the piston, so that the carbon-containing gas can fully and comprehensively contact the piston surface.

[0042] See also Figure 6-Figure 9The ventilation unit 4 includes an L-shaped ventilation column 41 fixed in the infiltration furnace 12, and a telescopic limit element 42 is slidably connected in the horizontal section of the L-shaped ventilation column 41; the L-shaped fixed rod 311 is provided with a power element 43 for controlling the synchronous telescopic limit elements 42 to extend and retract; the telescopic limit element 42 includes a ventilation sleeve 421 slidably connected in the non-vertical section of the L-shaped ventilation column 41, the ventilation sleeve 421 is perpendicular to the limiting rods 422 symmetrically fixed on both sides of the radial direction along the bottom of the infiltration furnace 12, and the horizontal section of the L-shaped ventilation column 41 is provided with a limiting groove matching the limiting rod 422, and the ends of the two adjacent ventilation sleeves 421 that are close to each other are both installed with a limiting through pipe 423, and a plurality of groups of circular arrays of balls 424 are linearly arranged on the side of the limiting through pipe 423, and a plurality of groups of circular arrays of through holes 425 are linearly arranged at the position where the side of the limiting through pipe 423 and the balls 424 are staggered.

[0043] The ventilation unit 4 is not only used to ventilate the piston hole position in a targeted manner, but also can limit the piston with the limiting tube 423, and fix the position of the piston in cooperation with the positioning unit 3. After the piston position is fixed, the piston hole position can be ventilated through the through hole 425 set on the limiting tube 423. In addition, the setting of the ball 424 can not only separate the limiting tube 423 and the inside of the piston hole to facilitate the gas to penetrate into the piston hole wall, but also limit the piston position.

[0044] Specifically, when the cover plate 211 seals the top of the infiltration furnace 12, due to the positioning effect of the clamp 226 on the bottom ear seat of the piston, the hole of the piston is just aligned with the position of the telescopic limiting element 42, and then the power element 43 is controlled to drive the ventilation sleeve 421 to move. When the two adjacent ventilation sleeves 421 move toward the piston, the limiting through tube 423 is just stuck in the hole of the piston, and the ball 424 is just in contact with the wall of the piston hole, thereby completing the positioning of the piston hole.

[0045] See also Figure 6 , Figure 8 and Fig.10 The power element 43 includes a slide rail 431 fixed on the L-shaped fixed rod 311, and a push block 432 is slidably connected to the slide rail 431. The sides of the push block 432 close to the limiting rods 422 on the two telescopic limiting elements 42 are hinged with connecting rods 433, and a driving rod 434 is rotatably installed between the end of the connecting rod 433 away from the push block 432 and the limiting rod 422 at the corresponding position; a penetrating rod 435 penetrating the bottom of the infiltration furnace 12 is fixed at the bottom of the push block 432, and a tension ring 436 is commonly connected to the bottom of all the penetrating rods 435; a No. 4 cylinder 437 is fixed on the top of the bottom support plate 1, and the push end of the No. 4 cylinder 437 is connected to the tension ring 436.

[0046] The power element 43 is used to synchronously move the two ventilation sleeves 421, so that the limiting tube 423 is stuck in the hole of the piston, and all the through rods 435 are synchronously driven to move by the No. 4 cylinder 437, so that all the pistons in the infiltration furnace 12 can be quickly positioned, so as to cooperate with the synchronization element 23 to perform batch infiltration treatment of pistons, thereby improving the efficiency of the infiltration treatment.

[0047] Specifically, when the hole of the piston is just aligned with the position of the telescopic limit element 42, the No. 4 cylinder 437 is controlled downward; the tension ring 436 is pulled, and at this time all the through rods 435 will move downward with the downward movement of the tension ring 436, and drive the push block 432 to move downward. At this time, due to the downward movement of the push block 432, the two connecting rods 433 will pull the limit rod 422 inward through the driving rod 434, thereby making the ventilation sleeve 421 move toward the piston, and drive the limit through pipe 423 to insert into the piston hole.

[0048] See also Figure 8 The positioning unit 3 includes a positioning column 31 fixed in the infiltration furnace 12, and the positioning column 31 is symmetrically fixed with L-shaped fixing rods 311 on both sides of the radial direction perpendicular to the bottom of the infiltration furnace 12. A rotating rod 312 is hinged on the top of the positioning column 31, and the rotating rod 312 is symmetrically provided with synchronous pushing elements 32 on both sides of the radial direction perpendicular to the bottom of the infiltration furnace 12. An inner push rod 313 is fixed on the top of the rotating rod 312, and an upper pushing element 33 is rotatably installed on the side of the positioning column 31 for cooperating with the synchronous pushing element 32 to push the rotating rod 312.

[0049] The positioning unit 3 is used to cooperate with the ventilation unit 4 to position the piston, and the synchronous pushing element 32 and the pushing element 33 cooperate with each other so that the piston can swing radially perpendicular to the bottom of the infiltration furnace 12 after positioning, thereby facilitating the ventilation unit 4 to carry out targeted and uniform ventilation of the hole position of the piston, while increasing the contact between the piston and the carbon-containing gas, and due to the swing of the piston, the carbon-containing gas in the infiltration furnace 12 can also be stirred, so that the distribution of the carbon-containing gas is more uniform and the flow of the carbon-containing gas is increased.

[0050] Specifically, after the ventilation unit 4 completes positioning of the piston, the carbon-containing gas is introduced into the infiltration furnace 12 through the vent hole 121 and the ventilation cavity 14, and then the push-up element 33 is controlled to drive the synchronous pushing element 32 to push the rotating rod 312, and the piston is pushed from the inside of the piston through the inner push rod 313, so that the piston swings radially perpendicular to the bottom of the infiltration furnace 12, thereby cooperating with the ventilation unit 4 to ventilate the hole of the piston while increasing the contact between the piston and the carbon-containing gas in the infiltration furnace 12.

[0051] See also Figure 6 and Figure 8The synchronous pushing element 32 includes a square telescopic rod 321 fixed on the rotating rod 312 perpendicular to the radial side of the bottom of the infiltration furnace 12, and a push rod 322 is hinged at the bottom of the telescopic end of the square telescopic rod 321, and the push rod 322 passes through the non-vertical section of the L-shaped fixed rod 311; the pushing element 33 includes a rotating ring 331 rotatably installed at the bottom of the infiltration furnace 12, and a pushing protrusion 332 and a yield groove 333 are arranged at the top of the rotating ring 331 corresponding to the position of the pushed rod 322, and the connecting line of the pushing protrusion 332 and the yield groove 333 passes through the center position of the positioning column 31, and the bottom of the rotating ring 331 passes through the bottom of the infiltration furnace 12, and a synchronous column 334 is fixed to the bottom of the rotating ring 331; a power motor 335 is installed on the top of the bottom support plate 1 through a motor box, and a transmission belt 336 is commonly provided on the output end of the power motor 335 and all the synchronous columns 334.

[0052] The synchronous pushing element 32 is used to cooperate with the upward pushing element 33 to push the rotating rod 312, mainly by pushing the pushed rod 322 upward through the pushing protrusion 332, and using the make way groove 333 on the other side to make way for the corresponding pushed rod 322 to move downward, so that the rotating rod 312 rotates with the position hinged at the top of the positioning column 31 as the turning point, and swings the piston radially perpendicular to the bottom of the infiltration furnace 12.

[0053] Specifically, when carbon-containing gas is introduced into the infiltration furnace 12, the power motor 335 is controlled to drive the transmission belt 336 to rotate, thereby driving all the synchronous columns 334 to rotate with the transmission belt 336. At this time, as the synchronous columns 334 rotate, the rotating ring 331 will rotate rapidly, and due to the rotation of the rotating ring 331, the pushing protrusion 332 on the rotating ring 331 will push the pushed rod 322 upward, and in the process of the pushed rod 322 driving the square telescopic rod 321 to rotate upward, the square telescopic rod 321 will extend and cause the rotating rod 312 to rotate, and due to the rotation of the rotating rod 312, the square telescopic rod 321 on the other side will press the pushed rod 322 downward and cause the pushed rod 322 to abut against the position of the yield groove 333 on the rotating ring 331, and after the pushing protrusion 332 and the yield groove 333 are separated from the pushed rod 322 at the same time, the pushed rod 322 will return to its original position and cause the rotating rod 312 to return to a vertical state.

[0054] It should be noted that in order to ensure the sealing inside the infiltration furnace 12, it is necessary to provide heat insulating sealing materials at the rotating ring 331 penetrating the bottom of the infiltration furnace 12, the penetrating rod 435, the outer sleeve column 221 penetrating the cover plate 211, and the middle rod 223.

[0055] The working steps of the present invention are as follows: In the first step, the operator places the pistons one by one on the clamping element 22, and then controls the synchronization element 23 to drive the clamping element 22 to position the piston. At this time, the infiltration furnace 12 is heated in an empty furnace in advance. After the temperature in the infiltration furnace 12 reaches the specified temperature, the No. 1 cylinder 21 is controlled to push the cover plate 211 downward until the embedded ring at the bottom of the cover plate 211 cooperates with the interlocking groove at the top of the infiltration furnace 12 and completes the closure of the top of the infiltration furnace 12. During this process, the piston moves downward and moves to the position of the positioning unit 3 and the ventilation unit 4.

[0056] In the second step, after the cover plate 211 seals the top of the infiltration furnace 12, due to the positioning effect of the clamping claw 226 on the ear seat at the bottom of the piston, the hole of the piston is just aligned with the position of the telescopic limiting element 42, and then the power element 43 is controlled to drive the ventilation sleeve 421 to move. When the two adjacent ventilation sleeves 421 move toward the piston, the limiting through pipe 423 is just stuck in the hole of the piston, and the ball 424 just contacts the wall of the piston hole, thereby completing the positioning of the piston hole.

[0057] In the third step, after the subsequent ventilation unit 4 has completed positioning the position of the piston hole, the clamping element 22 is controlled by the synchronization element 23 to completely release the positioning effect on the piston, and then the carbon-containing gas is introduced into the infiltration furnace 12 through the ventilation hole 121 and the ventilation cavity 14.

[0058] In the fourth step, after the carbon-containing gas is introduced into the infiltration furnace 12, the upward push element 33 is controlled to drive the synchronous push element 32 to push the rotating rod 312, and the piston is pushed from the inside of the piston through the inner push rod 313, so that the piston swings radially perpendicular to the bottom of the infiltration furnace 12, and then cooperates with the ventilation unit 4 to ventilate the hole of the piston while increasing the contact between the piston and the carbon-containing gas in the infiltration furnace 12.

[0059] The fifth step is to wait for the piston to be in full contact with the infiltration furnace 12 for a period of time, and then control the clamping element 22 to clamp the piston again through the synchronization element 23. After the clamping is completed, control the power element 43 to release the limiting effect of the telescopic limiting element 42 on the piston, and then slowly reduce the temperature in the infiltration furnace 12. After the temperature is lowered, control the No. 1 cylinder 21 to pull the cover plate 211 upwards, and then take out the carburized piston for subsequent processing.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention and they are still covered by the protection scope of the present invention.

Claims

1. An engine piston processing heat treatment equipment, comprising a bottom support plate (1), a permeation furnace (12) is fixed to the top of the bottom support plate (1) through a vertical column (11), characterized in that: The infiltration furnace (12) is fixed with a top plate (13) by U-shaped rods symmetrically distributed on the left and right sides, a cover clamping unit (2) is arranged at the bottom of the top plate (13), a plurality of positioning units (3) are evenly arranged in the circumferential direction of the infiltration furnace (12), ventilation units (4) are arranged in the infiltration furnace (12) and on both sides of each positioning unit (3) close to and away from the center of the infiltration furnace (12), ventilation holes (121) are symmetrically arranged on the side of the infiltration furnace (12), and a ventilation cavity (14) for ventilating each ventilation unit (4) is arranged in the infiltration furnace (12); The capping clamping unit (2) comprises a No. 1 cylinder (21) fixed to the bottom of the top plate (13), a cover plate (211) being fixed to the pushing end of the No. 1 cylinder (21), an embedded ring being fixed to the bottom of the cover plate (211), a fitting groove for matching the embedded ring being provided at the top of the infiltration furnace (12), a plurality of clamping elements (22) corresponding to the positions of the positioning units (3) being uniformly provided in the circumferential direction in the cover plate (211), the clamping elements (22) being used to clamp the piston; the clamping elements (22) are synchronously clamped by a synchronous element (23) provided on the top of the cover plate (211); The positioning unit (3) comprises a positioning column (31) fixed in the infiltration furnace (12), the positioning column (31) is symmetrically fixed with L-shaped fixing rods (311) on both sides of the radial direction perpendicular to the bottom of the infiltration furnace (12), a rotating rod (312) is hinged on the top of the positioning column (31), the rotating rod (312) is symmetrically provided with synchronous pushing elements (32) on both sides of the radial direction perpendicular to the bottom of the infiltration furnace (12), an inner pushing rod (313) is fixed on the top of the rotating rod (312), and the positioning column ( 31) is rotatably mounted on the side thereof with an upward pushing element (33) for cooperating with a synchronous pushing element (32) to push the rotating rod (312); the ventilation unit (4) comprises an L-shaped ventilation column (41) fixed in the infiltration furnace (12), and a telescopic limiting element (42) is slidably connected in the horizontal section of the L-shaped ventilation column (41); a power element (43) for controlling two adjacent telescopic limiting elements (42) to synchronously extend and retract is arranged on the L-shaped fixed rod (311); The telescopic limiting element (42) comprises a ventilation sleeve (421) slidably connected in a non-vertical section of an L-shaped ventilation column (41); the ventilation sleeve (421) is symmetrically fixed with limiting rods (422) on both sides perpendicular to the radial direction along the bottom of the permeation furnace (12); a limiting groove cooperating with the limiting rod (422) is arranged on the horizontal section of the L-shaped ventilation column (41); a limiting through tube (423) is installed at one end of two adjacent ventilation sleeves (421) close to each other; a plurality of groups of circular arrays of balls (424) are linearly arranged on the side of the limiting through tube (423); a plurality of groups of circular arrays of through holes (425) are linearly arranged on the side of the limiting through tube (423) at a position staggered with the balls (424).

2. The engine piston processing heat treatment equipment according to claim 1, characterized in that: The clamping element (22) includes an outer sleeve column (221) vertically slidably connected to the middle part of the cover plate (211), and a group of track plates (222) are symmetrically fixed on both sides of the outer sleeve column (221) perpendicular to the radial direction of the bottom of the infiltration furnace (12), and each track plate (222) is provided with a track groove. The outer sleeve column (221) is a hollow structure, and a center rod (223) is slidably connected inside the outer sleeve column (221).

3. The engine piston processing heat treatment equipment according to claim 2, characterized in that: A semicircular rod (224) is slidably connected to the position of each group of track plates (222) in the middle rod (223), and the two semicircular rods (224) can fit together to form a circular rod; an avoidance groove is provided on the side of the outer sleeve (221) and at the position corresponding to the semicircular rod (224), and a track rod (225) is fixed at one end of each semicircular rod (224) away from the middle rod (223), and clamps (226) are fixed at both ends of the track rod (225) located on the outside of the corresponding track plate (222), and the clamps (226) are used to clamp the bottom of the piston.

4. The engine piston processing heat treatment equipment according to claim 3, characterized in that: The synchronization element (23) comprises two synchronization rings (231) arranged on the top of the middle rod (223) and the side of the outer sleeve column (221) at the top of the middle rod (223) and staggered up and down; an L-shaped front plate (232) is fixed on the rear side of the top of the cover plate (211); a No. 2 cylinder (233) and a No. 3 cylinder (234) are fixed on the bottom of the longitudinal section of the L-shaped front plate (232) and staggered front and rear; the push end of the No. 2 cylinder (233) is connected to the synchronization ring (231) located at the lower side, and the push end of the No. 3 cylinder (234) is connected to the synchronization ring (231) located at the upper side.

5. The engine piston processing heat treatment equipment according to claim 1, characterized in that: The synchronous pushing element (32) includes a square telescopic rod (321) fixed on the rotating rod (312) perpendicular to the radial side of the bottom of the infiltration furnace (12), and a push rod (322) is hinged at the bottom of the telescopic end of the square telescopic rod (321), and the push rod (322) passes through the non-vertical section of the L-shaped fixed rod (311).

6. The engine piston processing heat treatment equipment according to claim 5, characterized in that: The pushing element (33) includes a rotating ring (331) rotatably installed at the bottom of the infiltration furnace (12), and a pushing protrusion (332) and a giving way groove (333) are arranged at the top of the rotating ring (331) corresponding to the position of the pushed rod (322). The connecting line of the pushing protrusion (332) and the giving way groove (333) passes through the center position of the positioning column (31), and the bottom of the rotating ring (331) passes through the bottom of the infiltration furnace (12), and a synchronous column (334) is fixed to the bottom of the rotating ring (331); a power motor (335) is installed at the top of the bottom support plate (1) through a motor box, and a transmission belt (336) is commonly provided on the output end of the power motor (335) and all the synchronous columns (334).

7. The engine piston processing heat treatment equipment according to claim 6, characterized in that: The power element (43) comprises a slide rail (431) fixed on an L-shaped fixed rod (311), a push block (432) being slidably connected to the slide rail (431), a connecting rod (433) being hinged on the side of the push block (432) close to the limiting rods (422) on the two telescopic limiting elements (42), a driving rod (434) being rotatably installed between the end of the connecting rod (433) away from the push block (432) and the limiting rod (422) at the corresponding position; a penetrating rod (435) penetrating the bottom of the infiltration furnace (12) is fixed at the bottom of the push block (432), and a tension ring (436) is commonly connected at the bottom of all the penetrating rods (435); a No. 4 cylinder (437) is fixed at the top of the bottom support plate (1), and the push end of the No. 4 cylinder (437) is connected to the tension ring (436).

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