Plastic machine screw surface strengthening heat treatment device with uniform strengthening function

Abstract

The invention discloses a plastic machine screw surface strengthening heat treatment device with a uniform strengthening function, and belongs to the technical field of plastic machine screw machining, the plastic machine screw surface strengthening heat treatment device comprises a pit furnace, a hanging bracket is arranged at the top of the pit furnace, a driving assembly is arranged at the top of the hanging bracket, and a plurality of screws and a plurality of circular sleeves are arranged in the hanging bracket in a circumferential array mode. According to the high-activity carburizing nitrogen supply device, second rolling wheels make contact with the outer surfaces of the two adjacent screw flights, the stability of the high-activity carburizing nitrogen supply device in the using process is guaranteed, and in the process, an external high-activity carburizing nitrogen supply device conveys nitrogen into a threaded groove in a screw through a gas inlet pipe, a fixing frame, a gas conveying frame and a spray head; the high-activity carburizing nitrogen is forcibly injected into the screw flight root or the deep groove area where the traditional atmosphere is difficult to uniformly permeate, the transmission efficiency of carbon and nitrogen atoms to the surface of the deep groove is remarkably improved, full-coverage type local strengthening treatment on the spiral groove in the whole screw is achieved, and particularly the advantages on variable-pitch and variable-groove-depth screws are more obvious.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic machine screw processing, and in particular relates to a plastic machine screw surface strengthening heat treatment device with uniform strengthening. Background Art

[0002] The screw is a key component widely used in various types of plastic extruders, rubber extruders, resin extruders and injection molding machines. The screw is often in a high temperature, oxidizing and strongly acidic corrosive environment, which causes corrosion and wear on the screw surface, making it difficult to extrude the material, leading to blockage and making the extruder and injection molding machine unable to work normally. Therefore, the screw needs to be heat treated during the production process to strengthen its surface strength.

[0003] For example, a Chinese patent document (CN119685575A) discloses a heat treatment device for twin-screw processing, comprising a base, wherein one outer end of the base is fixedly connected to a motor 1, and the other end of the base is provided with a slot, wherein a lead screw is rotatably connected to the inner portion of the slot, and a threaded block is threadedly connected to the lead screw, and the output end of the motor 1 is fixedly connected to the lead screw, and the inner end of the threaded block is fixedly connected to a movable frame. The invention provides two sets of connecting frames and rotating rings on the movable frame, which can correspond to the two ends of the twin-screws, and can position the screws on the movable frame in conjunction with the clamping assembly. Twin screws of different lengths are heat treated, and the gear assembly cooperates with the pulley assembly to realize the rotation of the twin screws to ensure the uniformity of the twin screws during heat treatment and improve the heat treatment efficiency of the twin screws. The moving assembly can control the position of the movable frame inside the shell, which can greatly improve the effect of heat treatment. However, during the use of this device, the use heights between the screw thread groove and the screw ridge are different, which makes it difficult to achieve a uniform strengthening effect on the entire screw profile during the heat treatment strengthening process, and easily causes uneven distribution of the hardened layer depth and surface properties. Therefore, improvement is needed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the thread groove and the screw ridge of the screw are used at different heights during use in the prior art, which makes it difficult to achieve a uniform strengthening effect on the entire screw profile during the heat treatment strengthening process of the screw, and easily causes uneven distribution of the hardened layer depth and surface properties. A surface strengthening heat treatment device for a plastic machine screw with uniform strengthening is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A surface strengthening heat treatment device for a plastic machine screw with uniform strengthening, comprising a pit furnace, a hanger provided on the top of the pit furnace, a drive assembly provided on the top of the hanger, a plurality of screws and a plurality of circular sleeves arranged in a circumferential array inside the hanger, a support unit provided on the outer circumference of the screw, and an auxiliary homogenizing assembly and an auxiliary air injection assembly provided on one side of the screw; The auxiliary homogenizing assembly includes a rectangular frame fixedly connected to one side of the bottom of the circular sleeve, a connecting box and a fixed box are slidably connected inside the rectangular frame, a positive and negative lead screw is rotatably connected to one side of the fixed box, and the positive and negative lead screws are provided with two fixed plates through the lead screw seats on both sides, one side of the fixed plate extends to the outside of the connecting box and is fixedly connected to the second roller, and the second roller and the auxiliary jet assembly are driven to move on the outer periphery of the screw by the screw and its peripheral side screw ridges to perform uniform and enhanced heat treatment on the outer periphery of the screw.

[0006] As a further description of the above technical solution: A first spring is fixedly connected to the top of the connection box, and the top of the first spring is fixedly connected to the inner wall of the rectangular frame. Two second springs are fixedly connected to one side of the interior of the connection box, and a sliding plate is fixedly connected to the other side of the second spring. The sliding plate is slidably connected to the interior of the connection box, and a sliding block is fixedly connected to the side of the sliding plate away from the second spring. The other side of the sliding block extends to the outside of the connection box and is fixedly connected to the outer wall of the fixed box. The sliding block is slidably connected to the interior of the connection box.

[0007] As a further description of the above technical solution: Two thread grooves with the same pitch and opposite thread directions are provided inside the forward and reverse screws. The screw seat is connected to the outer peripheral side of the forward and reverse screws through a slider transmission. One side of the screw seat is fixedly connected to the outer wall of the fixed plate. A rectangular through hole is symmetrically opened on one side of the interior of the fixed box. The fixed plate is slidably connected to the inside of the rectangular through hole, and protective plates are fixedly connected on both sides of the fixed plate. The protective plates are slidably connected to the inside of the fixed box.

[0008] As a further description of the above technical solution: A first bevel gear is fixedly connected to the center of the forward and reverse screws, a second bevel gear is meshedly connected to one side of the bottom of the first bevel gear, a circular shaft is fixedly connected to the inside of the second bevel gear, one end of the circular shaft extends to the outside of the fixed box and is fixedly connected to a turning handle, the circular shaft is rotatably connected to the inside of the fixed box, a limiting unit is provided on the outer circumference of the circular shaft, and one side of the limiting unit is fixedly connected to the inner wall of the fixed box.

[0009] As a further description of the above technical solution: A first cone block is fixedly connected to one side of the top of the fixed box, a second cone block is arranged above the inclined surface of the first cone block, a top side of the second cone block is fixedly connected to the outer wall of the rectangular frame, a second through hole is opened inside the rectangular frame, and the first cone block is slidably connected inside the second through hole.

[0010] As a further description of the above technical solution: Travel grooves are provided on both sides of the rectangular frame. The cross-sectional shape of the travel groove is an oblique quadrilateral, and elastic blocking units are provided on the upper and lower sides of the travel groove. A guide rod is slidably connected to the inside of the travel groove, and the opposite ends of the two guide rods are fixedly connected to the outer wall of the fixed box. There are multiple first through holes in a circular array inside the hanger, and a circular sleeve is provided inside the first through hole.

[0011] As a further description of the above technical solution: The auxiliary jet assembly includes a fixed frame fixedly connected to one side of the outside of the fixed box, and the upper and lower sides of the fixed frame are connected to the gas delivery frame, and the gas delivery frame and one side of the fixed frame are connected to multiple nozzles, and the nozzles are arranged on the side opposite to the screw. One side of the fixed frame is connected to the external supply device through an air inlet pipe, and a rectangular piston is slidably sealed on one side of the inside of the gas delivery frame, and the two rectangular pistons are fixedly connected to rectangular sliders on the opposite sides, and the other side of the rectangular slider extends to the outside of the gas delivery frame, and the rectangular slider is slidably connected to the inside of the gas delivery frame, and the rectangular slider is fixedly connected to a connecting frame away from the rectangular piston. The bottom of the connecting frame is fixedly connected to the outer wall of the fixed plate, and the cross-sectional shape of the connecting frame is set to L-shaped, and the fixed plate is slidably connected to the gas delivery frame through the built-in third through hole.

[0012] As a further description of the above technical solution: The supporting unit includes a plurality of fixed sleeves arranged in a circular array on the outer peripheral side of the first through hole, the top of the fixed sleeve is fixedly connected to the bottom of the circular sleeve, the interior of the fixed sleeve is slidably connected to a sliding sleeve, the bottom of the sliding sleeve extends to the outside of the fixed sleeve and is rotatably connected to a connecting block through a connecting shaft, a first roller is provided on the side of the connecting block away from the sliding sleeve, the connecting shaft is rotatably connected to the interior of the sliding sleeve, and a driving synchronous pulley is fixedly connected to the outer peripheral side of the connecting shaft, the outer peripheral side of the driving synchronous pulley is connected to a driven synchronous pulley through a synchronous belt transmission, a hand crank is provided inside the driven synchronous pulley through a fixed shaft, and an adjusting bolt is provided on one side of the fixed sleeve and the sliding sleeve.

[0013] As a further description of the above technical solution: The driving assembly includes a plurality of first gears arranged directly above the plurality of first through holes, a rotating sleeve is fixedly connected to the interior of the first gear, the rotating sleeve is rotatably connected to the inner circumference of the circular sleeve, the inner circumference of the rotating sleeve is fixedly connected to a limiting sleeve, limiting through holes are provided on both sides of the interior of the limiting sleeve, a connecting sleeve is provided on the inner circumference of the limiting sleeve, and limiting sliders are fixedly connected on both sides of the outer circumference of the connecting sleeve, and the limiting sliders are slidably connected to the interior of the limiting through holes.

[0014] As a further description of the above technical solution: The outer circumference of multiple first gears is meshed with the same ring gear, and the ring gear is rotatably connected to the top of the hanger. The inner side of the ring gear is meshed with a second gear, and the inner part of the second gear is fixedly connected to a rotating shaft, and the top of the rotating shaft is fixedly connected to a drive motor, and the drive motor is fixedly connected to the top of the hanger through a support seat.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In the present invention, by providing an auxiliary homogenizing component and an auxiliary jet component, the staff can manually operate the rotating handle to drive the circular shaft, the second bevel gear, the first bevel gear and the forward and reverse screws to rotate, so that the screw seat drives the fixed plate and the second roller to move in opposite directions, so that the second roller contacts the outer surfaces of the two adjacent screw ridges. During the rotation of the screw, the fixed box, the sliding block and the connecting box will be assisted to move upward and separate from the top of the screw ridge, and cooperate with the squeezing force of the second cone block on the first cone block to make the guide rod enter the vertical section on the other side of the stroke groove and reset. This device contacts the outer surfaces of two adjacent screw fins through the second roller, ensuring its stability during use. In this process, the external high-activity carburizing nitrogen supply device is transported to the thread groove inside the screw through the air inlet pipe, fixed frame, gas delivery frame and nozzle, so as to forcibly inject the high-activity carburizing nitrogen into the area around the root of the screw fin or into the thread groove where traditional atmosphere is difficult to penetrate evenly, significantly enhancing the transmission efficiency of carbon and nitrogen atoms to the deep groove surface, thereby realizing full coverage local strengthening treatment of the spiral groove inside the screw, especially for variable pitch and variable groove depth screws.

[0016] 2. In the present invention, by providing an auxiliary jet assembly, the fixed plate will drive the rectangular slider and the rectangular piston to move inside the gas delivery frame through the connecting frame during movement, so as to adjust the use and connection status of multiple nozzles on one side of the gas delivery frame. This device can adjust the connection status of the nozzles inside the thread groove according to the pitch of different screws, so that it can adapt to the heat treatment requirements inside different thread grooves, effectively improving the applicability of the device.

[0017] 3. In the present invention, by providing a driving assembly and a supporting unit, the driving motor drives the rotating shaft, the second gear, the ring gear, the multiple first gears, the rotating sleeve, the limiting sleeve, the connecting sleeve and the screw to rotate slowly, so that various parts of the screw surface can be more evenly exposed to the furnace heat radiation and convection environment inside the pit furnace, reducing the local temperature difference caused by gravity or position, helping to overcome the small temperature difference that may exist at the bottom / top of the screw during static suspension, and effectively breaking the local atmosphere stagnation zone that may be formed in the spiral groove of the screw, ensuring that the active carburizing / nitriding atmosphere can continuously and evenly contact all surfaces, effectively improving the surface carburizing heat treatment uniformity of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 Schematic diagram of the overall three-dimensional structure of the drive assembly in the present invention; Figure 3 This is a schematic diagram of the overall three-dimensional structure of the drive assembly and the screw from another perspective in the present invention; Figure 4 Schematic diagram of the overall three-dimensional structure of the support unit and the auxiliary homogenization component in the present invention; Figure 5 For the present invention Figure 4 A local enlarged structural diagram of point A; Figure 6 For the present invention Figure 4 A schematic diagram of the partially enlarged structure at point B; Figure 7 It is a schematic diagram of a partial three-dimensional structure of the support unit in the present invention; Figure 8 Schematic diagram of the overall three-dimensional structure of the auxiliary homogenization component and the auxiliary air injection component in the present invention; Figure 9 It is a schematic diagram of the internal three-dimensional structure of the fixed box in the present invention.

[0019] Legend: 1. Pit furnace; 2. Hanger; 3. Drive assembly; 301. First gear; 302. Ring gear; 303. Second gear; 304. Drive motor; 305. Rotating sleeve; 306. Limiting sleeve; 307. Connecting sleeve; 4. Screw; 5. Support unit; 501. Fixed sleeve; 502. Sliding sleeve; 503. Connecting block; 504. First roller; 505. Connecting shaft; 506. Active synchronous pulley; 507. Driven synchronous pulley; 6. Auxiliary homogenization assembly; 601. Rectangular frame; 602, first spring; 603, connecting box; 604, second spring; 605, sliding plate; 606, sliding block; 607, fixed box; 608, forward and reverse screws; 609, first bevel gear; 610, second bevel gear; 611, screw seat; 612, fixed plate; 613, second roller; 614, first cone block; 615, second cone block; 616, travel groove; 7, auxiliary jet assembly; 701, fixed frame; 702, air supply frame; 703, connecting frame; 704, rectangular slider. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figures 1-9 The present invention provides a technical solution: a surface strengthening heat treatment device for a plastic machine screw with uniform strengthening, comprising a pit furnace 1, a hanger 2 is provided on the top of the pit furnace 1, a drive assembly 3 is provided on the top of the hanger 2, a plurality of screws 4 and a plurality of circular sleeves are arranged in a circular array inside the hanger 2, a support unit 5 is provided on the outer circumference of the screw 4, and an auxiliary homogenizing assembly 6 and an auxiliary air injection assembly 7 are provided on one side of the screw 4; The auxiliary homogenizing component 6 includes a rectangular frame 601 fixedly connected to one side of the bottom of the circular sleeve, and a connecting box 603 and a fixed box 607 are slidably connected inside the rectangular frame 601. One side of the fixed box 607 is rotatably connected to a forward and reverse screw 608. The forward and reverse screw 608 is provided with two fixed plates 612 through the screw seats 611 on both sides. One side of the fixed plate 612 extends to the outside of the connecting box 603 and is fixedly connected to a second roller 613. The second roller 613 and the auxiliary jet assembly 7 are driven to move on the peripheral side of the screw 4 through the screw 4 and its peripheral side screw ridges to uniformly strengthen the peripheral side of the screw 4. The top of the connecting box 603 is fixedly connected to the first spring 602, and the top of the first spring 602 It is fixedly connected to the inner wall of the rectangular frame 601, and two second springs 604 are fixedly connected to one side of the connecting box 603. The other side of the second spring 604 is fixedly connected to a sliding plate 605. The sliding plate 605 is slidably connected to the inside of the connecting box 603, and the sliding plate 605 is fixedly connected to a sliding block 606 on the side away from the second spring 604. The other side of the sliding block 606 extends to the outside of the connecting box 603 and is fixedly connected to the outer wall of the fixed box 607. The sliding block 606 is slidably connected to the inside of the connecting box 603. Two thread grooves with the same pitch and opposite thread directions are provided inside the forward and reverse screws 608. The screw seat 611 is connected to the outer peripheral side of the forward and reverse screws 608 through a slider transmission. One side of the screw seat 611 is fixed to the fixed The outer wall of the fixed plate 612 is fixedly connected, and a rectangular through hole is symmetrically opened on one side of the interior of the fixed box 607. The fixed plate 612 is slidably connected to the interior of the rectangular through hole, and protective plates are fixedly connected on both sides of the fixed plate 612. The protective plates are slidably connected to the interior of the fixed box 607. A first bevel gear 609 is fixedly connected to the center of the forward and reverse screws 608. A second bevel gear 610 is meshed and connected to the bottom side of the first bevel gear 609. A circular shaft is fixedly connected to the interior of the second bevel gear 610. One end of the circular shaft extends to the outside of the fixed box 607 and is fixedly connected to a turning handle. The circular shaft is rotatably connected to the interior of the fixed box 607. A limiting unit is provided on the outer circumference of the circular shaft. One side of the limiting unit is fixedly connected to the inner wall of the fixed box 607. The fixed box 60 7 A first cone block 614 is fixedly connected to one side of the top, a second cone block 615 is provided above the oblique surface of the first cone block 614, a top side of the second cone block 615 is fixedly connected to the outer wall of the rectangular frame 601, a second through hole is provided inside the rectangular frame 601, the first cone block 614 is slidably connected to the inside of the second through hole, a travel groove 616 is provided on both sides of the inside of the rectangular frame 601, the cross-section of the travel groove 616 is provided with an oblique quadrilateral, and elastic blocking units are provided on the upper and lower sides of the travel groove 616, a guide rod is slidably connected to the inside of the travel groove 616, and the opposite ends of the two guide rods are fixedly connected to the outer wall of the fixed box 607, a plurality of first through holes are provided in a circular array inside the hanger 2, and a circular sleeve is provided inside the first through hole.

[0022] Specific implementation method: first place the pit furnace 1 to a suitable position, then fix the inner circumference of the connecting sleeve 307 to the outside of the external screw 4, and then place the multiple screws 4 and connecting sleeves 307 fixed as one into the inside of multiple limit sleeves 306 through an external lifting device. The limit sleeves 306 will limit the use position of the connecting sleeve 307 and the screw 4, so that the staff can manually operate the turning handle to drive the circular shaft and the second bevel gear 610 to rotate, and use the linkage effect between the second bevel gear 610 and the first bevel gear 609 to transmit power to the first bevel gear 609, so that the first bevel gear 609 drives the forward and reverse screws 608 to rotate, and then use the linkage effect between the forward and reverse screws 608 and the screw seat 611 to transmit power to On the screw seat 611, the screw seat 611 drives the fixed plate 612 and the second roller 613 to move in opposite directions, so that the second roller 613 contacts the outer surfaces of two adjacent screw ribs. After the installation of multiple screws 4 is completed, the hanger 2 is hoisted to the top of the pit furnace 1 through the external hoisting device, and the hanger 2 is sealed with the top of the pit furnace 1. It is then heated by the built-in heating unit of the pit furnace 1. After the temperature inside the pit furnace 1 is raised or reaches a certain temperature, the external nitrogen supply device transports nitrogen to the inside of the pit furnace 1 to reduce the oxygen content in the pit furnace 1 and establish an inert environment in the furnace. When the oxygen content in the pit furnace 1 drops to a safe level, the enriched gas and nitriding gas are accurately introduced to establish and maintain the required carbon potential and nitrogen potential furnace atmosphere. Afterwards, The screw 4 in the pit furnace 1 is kept warm at the set temperature, carbon potential and nitrogen potential to perform heat treatment on the screw 4. During the rotation, the screw 4 will assist in driving the fixed box 607, the sliding block 606 and the connecting box 603 to move upward through the second roller 613 and the fixed plate 612. When the first cone block 614 on the top of the connecting box 603 contacts the second cone block 615, the second roller 613 will be transported to the top of the screw rib of the screw 4. During this process, the external high-activity carburizing / nitrogen gas supply device is transported to the thread groove inside the screw 4 through the air inlet pipe, the fixed frame 701, the gas delivery frame 702 and the nozzle, so as to force the high-activity carburizing / nitrogen gas to be injected into the screw rib root or deep groove area where the traditional atmosphere is difficult to penetrate evenly, thereby significantly enhancing the penetration of carbon / nitrogen atoms into the deep groove. The transmission efficiency of the surface is improved. At the same time, the fixed box 607 will move inside the stroke groove 616 through the guide rod, and cooperate with the squeezing force of the second cone block 615 on the first cone block 614 to make the guide rod enter the vertical section on the other side of the stroke groove 616. At this time, the fixed box 607 will drive the fixed plate 612 and the second roller 613 to disengage from the screw rib of the screw 4, and stop driving the motor 304 at the same time. When the first spring 602 drives the connecting box 603, the sliding block 606 and the fixed box 607 to reset, after resetting, the force of the second spring 604 will drive the fixed box 607 and the guide rod to enter the original vertical section of the stroke groove 616. At this time, the fixed box 607 will drive the fixed plate 612 and the second roller 613 to enter between the two screw ribs at the bottom of the screw 4.This allows for full coverage of the entire internal spiral groove of the screw 4, providing a more pronounced advantage, especially for screws with variable pitch and depth.

[0023] The auxiliary jet assembly 7 includes a fixed frame 701 fixedly connected to the outer side of the fixed box 607, and the upper and lower sides of the fixed frame 701 are connected to the gas delivery frame 702. A plurality of nozzles are connected to one side of the gas delivery frame 702 and the fixed frame 701, and the nozzles are arranged on the side opposite to the screw 4. One side of the fixed frame 701 is connected to the external supply device through an air inlet pipe. A rectangular piston is slidably sealed on one side of the inside of the gas delivery frame 702, and the two rectangular pistons are fixedly connected to rectangular sliders 704 on the opposite sides. The other side of the rectangular slider 704 extends to the outside of the gas delivery frame 702, and the rectangular slider 704 is slidably connected to the inside of the gas delivery frame 702. The rectangular slider 704 is fixedly connected to a connecting frame 703 away from the rectangular piston. The bottom of the connecting frame 703 is fixedly connected to the outer wall of the fixed plate 612, and the cross-sectional shape of the connecting frame 703 is set to L-shaped. The fixed plate 612 is slidably connected to the gas delivery frame 702 through the built-in third through hole.

[0024] Specific implementation method: During the movement, the fixed plate 612 will drive the rectangular slider 704 and the rectangular piston to move inside the gas delivery frame 702 through the connecting frame 703, so as to adjust the use and connection status of multiple nozzles on one side of the gas delivery frame 702. This device can adjust the connection status of the nozzles inside the thread groove according to the pitch of different screws 4, so that it can adapt to the heat treatment requirements inside different thread grooves, effectively improving the applicability of the device.

[0025] The support unit 5 includes a plurality of fixed sleeves 501 arranged in a circular array on the outer peripheral side of the first through hole, the top of the fixed sleeve 501 is fixedly connected to the bottom of the circular sleeve, the fixed sleeve 501 is slidably connected to the sliding sleeve 502, the bottom of the sliding sleeve 502 extends to the outside of the fixed sleeve 501 and is rotatably connected to the connecting block 503 through a connecting shaft 505, the connecting block 503 is provided with a first roller 504 on the side away from the sliding sleeve 502, the connecting shaft 505 is rotatably connected to the inside of the sliding sleeve 502, and the outer peripheral side of the connecting shaft 505 is fixedly connected to the active synchronous pulley 506, the outer peripheral side of the active synchronous pulley 506 is connected to the driven synchronous pulley 507 through a synchronous belt transmission, the driven synchronous pulley 507 is provided with a hand crank through a fixed shaft, the fixed sleeve 501 and the sliding sleeve 502 are provided with an adjusting bolt, the driving assembly 3 includes a plurality of fixed sleeves 501 and a sliding sleeve 502. There are multiple first gears 301 just above the first through hole, and a rotating sleeve 305 is fixedly connected inside the first gear 301. The rotating sleeve 305 is rotatably connected to the inner circumference of the circular sleeve, and the inner circumference of the rotating sleeve 305 is fixedly connected to the limiting sleeve 306. Limited through holes are provided on both sides of the limiting sleeve 306, and a connecting sleeve 307 is provided on the inner circumference of the limiting sleeve 306. Both sides of the outer circumference of the connecting sleeve 307 are fixedly connected to the limiting slider, and the limiting slider is slidably connected inside the limiting through hole. The outer circumference of multiple first gears 301 are meshedly connected with the same ring gear 302, and the ring gear 302 is rotatably connected to the top of the hanger 2. One side of the ring gear 302 is meshedly connected with the second gear 303. The second gear 303 is fixedly connected with a rotating shaft, and the top of the rotating shaft is fixedly connected to a driving motor 304. The driving motor 304 is fixedly connected to the top of the hanger 2 through a support seat.

[0026] Specific implementation method: After the placement of the screw 4 is completed, the use height between the fixed sleeve 501 and the sliding sleeve 502 is adjusted by adjusting the bolt, and then the staff manually operates the hand crank to drive the fixed shaft and the driven synchronous pulley 507 to rotate. The driven synchronous pulley 507 drives the active synchronous pulley 506, the connecting shaft 505, the connecting block 503 and the first roller 504 to rotate through the synchronous belt, and the bottom of the screw 4 is linearly contacted through the first roller 504. This device adjusts the use height of the fixed sleeve 501 and the sliding sleeve 502 according to the different heights of the screw 4 to support the screws 4 at different heights, reduce their deformation under high temperature and gravity, and improve the applicability of the device. Start the drive motor 304, and drive the rotating shaft through the drive motor 304 The second gear 303 rotates with the second gear 303, and the linkage effect between the second gear 303 and the ring gear 302 is used to transmit power to the ring gear 302, so that the ring gear 302 drives multiple first gears 301, the rotating sleeve 305, the limiting sleeve 306, the connecting sleeve 307 and the screw 4 to rotate slowly, so that various parts of the surface of the screw 4 can be more evenly exposed to the furnace heat radiation and convection environment inside the shaft furnace 1, reducing the local temperature difference caused by gravity or position, helping to overcome the small temperature difference that may exist at the bottom / top of the screw 4 during static suspension, and effectively breaking the local atmosphere stagnation zone that may be formed in the spiral groove, deep recess and tooth side of the screw 4, ensuring that the active carburizing / nitriding atmosphere can continuously and evenly contact all surfaces, effectively improving the surface carburizing heat treatment uniformity of the screw 4.

[0027] Working principle: When in use, first place the pit furnace 1 in a suitable position, then fix the inner circumference of the connecting sleeve 307 to the outside of the external screw 4, and then place the multiple screws 4 and the connecting sleeve 307 fixed into one into the multiple limit sleeves 306 in turn through the external lifting device. The limit sleeve 306 will limit the use position of the connecting sleeve 307 and the screw 4. After the screw 4 is placed, the use height between the fixed sleeve 501 and the sliding sleeve 502 is adjusted by adjusting the bolt, and then the staff manually operates the hand crank to drive the fixed shaft and the driven synchronous pulley 507 to rotate. The driven synchronous pulley 507 drives the active synchronous pulley 506, the connecting shaft 505, the connecting block 503 and the first roller 504 to rotate through the synchronous belt, and makes line contact with the bottom of the screw 4 through the first roller 504; Afterwards, the staff manually operates the turning handle to drive the circular shaft and the second bevel gear 610 to rotate. The linkage effect between the second bevel gear 610 and the first bevel gear 609 is used to transmit power to the first bevel gear 609, so that the first bevel gear 609 drives the forward and reverse screws 608 to rotate. Then, the linkage effect between the forward and reverse screws 608 and the screw seat 611 is used to transmit power to the screw seat 611, so that the screw seat 611 drives the fixed plate 612 and the second roller 613 to move away from each other, so that the second roller 613 contacts the outer surfaces of two adjacent screw fins. During the movement, the fixed plate 612 drives the rectangular slider 704 and the rectangular piston to move inside the gas delivery frame 702 through the connecting frame 703, so as to adjust the use and connection status of multiple nozzles on one side of the gas delivery frame 702. After the installation of multiple screws 4 is completed, the hanger 2 is hoisted to the top of the pit furnace 1 by an external hoisting device, and the hanger 2 is sealed with the top of the pit furnace 1. Then, the pit furnace 1 is heated by the built-in heating unit. After the temperature inside the pit furnace 1 is raised or reaches a certain temperature, the external nitrogen supply device transports nitrogen into the pit furnace 1 to reduce the oxygen content in the pit furnace 1 and establish an inert environment in the furnace. When the oxygen content in the pit furnace 1 drops to a safe level, the enrichment gas and the nitriding gas are accurately introduced to establish and maintain the required carbon potential and nitrogen potential in the furnace atmosphere. Afterwards, the heat is kept at the set temperature, carbon potential and nitrogen potential to perform heat treatment on the screws 4 in the pit furnace 1. The drive motor 304 is started, and the drive motor 304 drives the rotating shaft and the second gear 303 to rotate. The linkage effect between the second gear 303 and the ring gear 302 is used to transmit power to the ring gear 302, so that the ring gear 302 drives multiple first gears 301, the rotating sleeve 305, the limiting sleeve 306, the connecting sleeve 307 and the screw 4 to rotate slowly, so that various parts of the surface of the screw 4 can be more evenly exposed to the inside of the shaft furnace 1. During the rotation process, the screw 4 will assist in driving the fixed box 607, the sliding block 606 and the connecting box 603 to move upward through the second roller 613 and the fixed plate 612. When the first cone block 614 at the top of the connecting box 603 contacts the second cone block 615, the second roller 613 will be transported to the top of the screw rib of the screw 4. At the same time, the fixed box 607 will move inside the stroke groove 616 through the guide rod, cooperating with the first The squeezing force of the second cone block 615 on the first cone block 614 causes the guide rod to enter the vertical section on the other side of the stroke groove 616. At this time, the fixed box 607 will drive the fixed plate 612 and the second roller 613 to disengage from the screw rib of the screw 4, and at the same time stop driving the motor 304. When the first spring 602 drives the connecting box 603, the sliding block 606 and the fixed box 607 to reset, after resetting, the force of the second spring 604 will drive the fixed box 607 and the guide rod to enter the original vertical section of the stroke groove 616. At this time, the fixed box 607 will drive the fixed plate 612 and the second roller 613 to enter between the two screw ribs at the bottom of the screw 4. During this process, the external high-activity carburizing / nitrogen gas supply device is delivered to the thread groove inside the screw 4 through the air inlet pipe, the fixed frame 701, the gas delivery frame 702 and the nozzle, so as to force the high-activity carburizing / nitrogen gas into the entire thread groove where traditional atmosphere is difficult to penetrate evenly.

[0028] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A surface strengthening heat treatment device for a plastic machine screw with uniform strengthening, comprising a pit furnace (1), characterized in that: A hanger (2) is provided on the top of the shaft furnace (1), a driving assembly (3) is provided on the top of the hanger (2), a plurality of screws (4) and a plurality of circular sleeves are arranged in a circumferential array inside the hanger (2), a supporting unit (5) is provided on the outer circumference of the screw (4), and an auxiliary homogenizing assembly (6) and an auxiliary jet assembly (7) are provided on one side of the screw (4); The auxiliary homogenizing assembly (6) comprises a rectangular frame (601) fixedly connected to one side of the bottom of the circular sleeve, wherein a connecting box (603) and a fixed box (607) are slidably connected inside the rectangular frame (601), and a forward and reverse lead screw (608) is rotatably connected to one side of the fixed box (607), and the forward and reverse lead screw (608) is provided with two fixed plates (612) through the lead screw seats (611) on both sides, and one side of the fixed plate (612) extends to the outside of the connecting box (603) and is fixedly connected to a second roller (613), and the second roller (613) and the auxiliary jet assembly (7) are driven to move on the peripheral side of the screw (4) through the screw (4) and its peripheral side screw ridges, so as to perform uniform strengthening heat treatment on the peripheral side of the screw (4).

2. The surface strengthening heat treatment device for a uniformly strengthened screw rod of a plastic machine according to claim 1, characterized in that: The top of the connection box (603) is fixedly connected to a first spring (602), the top of the first spring (602) is fixedly connected to the inner wall of the rectangular frame (601), one side of the interior of the connection box (603) is fixedly connected to two second springs (604), the other side of the second spring (604) is fixedly connected to a sliding plate (605), the sliding plate (605) is slidably connected to the interior of the connection box (603), and the side of the sliding plate (605) away from the second spring (604) is fixedly connected to a sliding block (606), the other side of the sliding block (606) extends to the outside of the connection box (603) and is fixedly connected to the outer wall of the fixed box (607), and the sliding block (606) is slidably connected to the interior of the connection box (603).

3. The surface strengthening heat treatment device for a uniformly strengthened screw rod of a plastic machine according to claim 2, characterized in that: Two thread grooves with the same pitch and opposite thread directions are provided inside the forward and reverse lead screws (608), the lead screw seat (611) is connected to the outer peripheral side of the forward and reverse lead screws (608) through a slider transmission, one side of the lead screw seat (611) is fixedly connected to the outer wall of the fixed plate (612), a rectangular through hole is symmetrically opened on one side of the interior of the fixed box (607), the fixed plate (612) is slidably connected inside the rectangular through hole, and protective plates are fixedly connected to both sides of the fixed plate (612), and the protective plates are slidably connected inside the fixed box (607).

4. The surface strengthening heat treatment device for a uniformly strengthened screw rod of a plastic machine according to claim 3, characterized in that: A first bevel gear (609) is fixedly connected to the center of the forward and reverse lead screws (608), a second bevel gear (610) is meshedly connected to one side of the bottom of the first bevel gear (609), a circular shaft is fixedly connected inside the second bevel gear (610), one end of the circular shaft extends to the outside of the fixed box (607) and is fixedly connected to a handle, the circular shaft is rotatably connected to the inside of the fixed box (607), a limiting unit is provided on the outer circumference of the circular shaft, and one side of the limiting unit is fixedly connected to the inner wall of the fixed box (607).

5. The device for heat treatment of the surface of a plastic machine screw with uniform strengthening according to claim 4, characterized in that: A first cone block (614) is fixedly connected to one side of the top of the fixed box (607), a second cone block (615) is provided above the oblique surface of the first cone block (614), a top side of the second cone block (615) is fixedly connected to the outer wall of the rectangular frame (601), a second through hole is provided inside the rectangular frame (601), and the first cone block (614) is slidably connected inside the second through hole.

6. The surface strengthening heat treatment device for a uniformly strengthened screw rod of a plastic machine according to claim 5, characterized in that: The rectangular frame (601) is provided with a travel groove (616) on both sides thereof, the cross-section of the travel groove (616) is provided with an oblique quadrilateral, and elastic blocking units are provided on both sides of the upper and lower sides of the travel groove (616), the travel groove (616) is slidably connected with a guide rod, and the opposite ends of the two guide rods are fixedly connected to the outer wall of the fixed box (607), and the hanger (2) has a plurality of first through holes in a circular array inside, and a circular sleeve is provided inside the first through hole.

7. The surface strengthening heat treatment device for a plastic machine screw with uniform strengthening according to claim 1, characterized in that: The auxiliary jet assembly (7) includes a fixed frame (701) fixedly connected to one side of the outside of the fixed box (607), the fixed frame (701) is connected to the air delivery frame (702) on both the upper and lower sides, the air delivery frame (702) and one side of the fixed frame (701) are connected to a plurality of nozzles, the nozzles are arranged on the side opposite to the screw (4), the fixed frame (701) is connected to the external supply device through the air inlet pipe, the inner side of the air delivery frame (702) is slidably sealed with a rectangular piston, and the two rectangular pistons are fixedly connected on the opposite sides. A rectangular slider (704) is provided, the other side of the rectangular slider (704) extending to the outside of the gas delivery frame (702), and the rectangular slider (704) is slidably connected to the inside of the gas delivery frame (702), and the rectangular slider (704) is fixedly connected to a connecting frame (703) on the side away from the rectangular piston, the bottom of the connecting frame (703) is fixedly connected to the outer wall of the fixed plate (612), and the cross-sectional shape of the connecting frame (703) is set to be L-shaped, and the fixed plate (612) is slidably connected to the gas delivery frame (702) through the built-in third through hole.

8. The device for heat treatment of the surface of a plastic machine screw with uniform strengthening according to claim 1, characterized in that: The support unit (5) comprises a plurality of fixed sleeves (501) arranged in a circumferential array on the outer peripheral side of the first through hole, the top of the fixed sleeve (501) is fixedly connected to the bottom of the circular sleeve, the interior of the fixed sleeve (501) is slidably connected to a sliding sleeve (502), the bottom of the sliding sleeve (502) extends to the outside of the fixed sleeve (501) and is rotatably connected to a connecting block (503) via a connecting shaft (505), and the connecting block (503) is provided on a side away from the sliding sleeve (502). A first roller (504) is provided, the connecting shaft (505) is rotatably connected to the interior of the sliding sleeve (502), and a driving synchronous pulley (506) is fixedly connected to the outer peripheral side of the connecting shaft (505), the outer peripheral side of the driving synchronous pulley (506) is connected to a driven synchronous pulley (507) via a synchronous belt transmission, a hand crank is provided inside the driven synchronous pulley (507) via a fixed shaft, and an adjusting bolt is provided on one side of the fixed sleeve (501) and the sliding sleeve (502).

9. The device for heat treatment of the surface of a plastic machine screw with uniform strengthening according to claim 1, characterized in that: The driving assembly (3) comprises a plurality of first gears (301) arranged directly above the plurality of first through holes, wherein a rotating sleeve (305) is fixedly connected inside the first gears (301), the rotating sleeve (305) is rotatably connected to the inner circumference of the circular sleeve, the inner circumference of the rotating sleeve (305) is fixedly connected to a limiting sleeve (306), both sides of the inner circumference of the limiting sleeve (306) are provided with limiting through holes, a connecting sleeve (307) is provided on the inner circumference of the limiting sleeve (306), both sides of the outer circumference of the connecting sleeve (307) are fixedly connected to limiting sliders, and the limiting sliders are slidably connected inside the limiting through holes.

10. The surface strengthening heat treatment device for a uniformly strengthened screw rod of a plastic machine according to claim 9, characterized in that: The outer peripheral sides of the plurality of first gears (301) are meshedly connected to the same ring gear (302), the ring gear (302) is rotatably connected to the top of the hanger (2), the inner side of the ring gear (302) is meshedly connected to the second gear (303), the inner side of the second gear (303) is fixedly connected to a rotating shaft, the top end of the rotating shaft is fixedly connected to a driving motor (304), and the driving motor (304) is fixedly connected to the top of the hanger (2) via a support seat.

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