A heat treatment structure for high-strength bolt production

Abstract

The present invention relates to the field of bolt production and manufacturing, and specifically to a heat treatment structure for high-strength bolt production, comprising a quenching furnace, a cooling pool, a base and a tempering furnace arranged in sequence from right to left, the base being inclined with the right side higher and the left side lower, and a conveying unit for vertically arranging the bolts and conveying them in sequence to the left, as well as a processing unit for cleaning and drying the thread grooves of the bolts, the present invention adopts the cooperation of a guide plate and a conveying rod to achieve efficient directional arrangement and exposure cleaning of the bolts, and the spacing arrangement of the conveying rods allows the bolts to automatically stand upright vertically under the action of gravity when falling, with the thread grooves exposed downwards, avoiding overlapping and blocking of the bolts, and creating necessary conditions for subsequent physical cleaning, the present invention adopts the linkage drive of a brush plate and a rubbing bar to achieve multi-degree-of-freedom deep cleaning of the thread grooves, and further remove residual coolant and oxide scale in the thread grooves.

Description

Technical Field

[0001] The invention relates to the field of bolt production and manufacturing, in particular to a heat treatment structure for producing high-strength bolts. Background Art

[0002] During the manufacturing process of high-strength bolts used in trucks, the bolt parts usually need to undergo a quenching and tempering heat treatment process to obtain the required mechanical properties. After the quenching process, cooling medium and oxide scale formed by high-temperature oxidation will remain on the surface of the bolt. Before entering the tempering furnace, these residues must be effectively removed. Otherwise, the residual cooling medium will quickly vaporize during the tempering process to produce high-pressure steam, which will react with the bolt material, causing pitting, pitting and even microcracks on the bolt surface. The oxide scale will hinder the uniform conduction of heat and affect the uniformity of the tempering temperature, resulting in inconsistent internal structure and performance of the bolt, reducing product reliability and shortening service life.

[0003] At present, quenched bolts are usually sent to the tempering furnace by a conveyor belt. During this process, the residual cooling medium is removed by natural air drying and evaporation drying by the residual heat of the bolts after quenching. During the transportation process, the bolts are dropped from a certain height to vibrate and impact the oxide scale, causing it to loosen and fall off.

[0004] However, it is difficult to remove the residual cooling medium accumulated inside the bolt thread groove by relying on natural air drying and the bolt's own residual heat to evaporate the coolant. In addition, the bolts that overlap and block each other during transportation make it difficult for natural airflow to effectively penetrate the bolts and carry away the cooling medium, resulting in incomplete drying and hidden dangers during tempering.

[0005] In addition, the internal stress state of the bolt after quenching is highly concentrated and the material is relatively brittle and hard. The direction of the impact force of the bolt when dropped and impacted is random and uncontrollable, which can easily generate additional shear stress on the bolt, thereby causing cracks or even causing the bolt to break directly.

[0006] Therefore, there is an urgent need for a method that can not only efficiently and thoroughly clean the residual liquid and oxide scale in the bolt thread groove, but also avoid damaging the heat treatment structure of the quenched bolt during the cleaning process as much as possible. Summary of the Invention

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a heat treatment structure for high-strength bolt production, including a quenching furnace, a cooling pool, a base and a tempering furnace arranged in sequence from right to left, the base is inclined with the right higher and the left lower, and a conveying unit for vertically arranging the bolts and conveying them to the left in sequence is provided on the upper side of the base, as well as a processing unit for cleaning and drying the thread groove of the bolts.

[0008] The conveying unit includes a left support plate fixedly installed on the left end of the upper side of the base and a right support plate on the right end. Several groups of material guide plates are arranged at equal intervals between the left support plate and the right support plate in the front-to-back direction. Several groups of conveying rods corresponding to the lower part of each group of material guide plates are rotatably arranged between the left support plate and the right support plate, and a blocking plate is fixedly installed on the upper right end of the material guide plate.

[0009] The processing unit comprises a plurality of groups of brush plates and rubbing rods arranged at equal intervals front to back on the upper part of the base through a driving assembly.

[0010] When the bolt falls to the upper right part of each group of conveyor rods, under the action of gravity, the bare rod part of the bolt passes through the corresponding group of conveyor rods, and the head of the bolt is stuck in the upper part of the corresponding group of conveyor rods, so that the bolt is arranged vertically. When the bolt moves to the left along the conveyor rod, the brush plate and the rubbing rod cooperate to rotate and brush the threaded part of the bolt.

[0011] Preferably, each group of the guide plates consists of two guide plates arranged symmetrically front to back, and the two guide plates in the same group have an open structure with a large upper spacing and a small lower spacing at the upper part, and a plate shape arranged vertically and parallel at the lower part.

[0012] Preferably, the lower side of the blocking plate is flush with the upper side of the plate-like structure of the guide plate, and front and rear enclosures are fixedly installed between the blocking plate and the right support plate. The blocking plate, the enclosure and the right support plate are combined into a feed basket structure.

[0013] Preferably, each group of the conveying rods consists of two conveying rods arranged in front and behind, the minimum distance between the two conveying rods in the same group is greater than the diameter of the bolt's polished rod and smaller than the diameter of the bolt's head, and the left part of the conveying rod has a spiral structure.

[0014] Preferably, a synchronous belt is wound around the right ends of all the conveying rods, a synchronous motor is fixedly mounted on the right side surface of the right support plate, and the output shaft of the synchronous motor is fixedly connected to any one of the conveying rods.

[0015] Preferably, each group of the bristle plates consists of two bristle plates arranged symmetrically front to back, and each group of rubbing rods consists of two rubbing rods arranged symmetrically front to back, and each group of bristle plates and rubbing rods corresponds one-to-one to each group of conveying rods.

[0016] Preferably, the driving assembly includes several groups of bracket seats that are slidably arranged on the upper side of the base, each group consisting of two bracket seats symmetrically arranged front to back, a movable plate is provided on the upper side of the bracket seat that slides up and down, and a guide bar is fixedly installed on the upper end of the bracket seat.

[0017] Preferably, the brush plate is fixedly connected to the side where the movable plates in the same group are close to each other, the rubbing rod bar is sliding left and right and is arranged on the side where the guide bars in the same group are close to each other, and a push-pull plate is hinged between the brush plate and the corresponding rubbing rod bar on the upper part, and the push-pull plates on the two brush plates in the same group are inclined in opposite directions.

[0018] Preferably, an air guide plate is provided on the lower side of the movable plate for sliding back and forth. Two air ducts are provided inside the air guide plate, which are respectively connected to the air extraction system and the air supply system. An air guide duct is provided inside the movable plate. The bristle plate has a hollow structure, and the side of the brush plate with bristles is provided with air holes arranged in an array.

[0019] Preferably, a push plate is provided on the air guide plate for sliding left and right, a top plate is fixedly installed between the left support plate and the blocking plate, a knocking piece is provided on the lower side of the top plate for sliding up and down, a coil spring is provided between the knocking piece and the top plate, and the lower part of the knocking piece is a rod-shaped structure arranged in an array.

[0020] The beneficial effects of the present invention are: 1. The present invention adopts the cooperation of the guide plate and the conveying rod to achieve efficient directional arrangement and exposure cleaning of the bolts. Through the guidance of each group of guide plates and the spacing arrangement of the conveying rods in the same group, the bolts automatically stand upright vertically under the action of gravity when falling, and the thread groove is exposed downward, avoiding the bolts overlapping and blocking each other, so that the thread groove is fully exposed, creating the necessary conditions for subsequent physical cleaning.

[0021] 2. The present invention adopts the linkage drive of the brush plate and the rubbing rod to achieve multi-degree-of-freedom deep cleaning of the thread groove. The driving component controls the two brush plates and the two rubbing rods in the same group to move toward each other, so that the brush plates penetrate into the bolt thread groove for brushing, and through the active up and down sliding of the brush plates, the longitudinal movement freedom in the thread groove is increased. The brush plate drives the two rubbing rods to move in the opposite direction, thereby rubbing the bolt to rotate, and further removes the coolant and oxide scale remaining in the thread groove.

[0022] 3. The present invention uses a striking piece to transmit vibration by striking along the axial direction of the bolt to achieve low-damage oxide scale peeling. When the air guide plate in the driving assembly moves up and down, the push plate cooperates with the striking piece, so that the rod-shaped structure at the bottom of the striking piece intermittently strikes along the axial direction of the bolt. The vibration energy is evenly transmitted through the axis of the bolt, while reducing the risk of micro-cracks in the bolt after quenching, and further shaking off the oxide scale on the thread groove and surface.

[0023] 4. The present invention adopts intelligent air path switching between the air guide plate and the movable plate to realize the integration of cleaning and drying. When the movable plate drives the brush plate to move back and forth, the internal air guide channel of the movable plate is alternately connected with the two air channels of the air guide plate. Therefore, when brushing, the residual liquid in the thread groove is sucked through the air holes of the brush plate. When not brushing, high-speed air flow is blown to the bolt through the air holes of the brush plate to accelerate the air flow and quickly evaporate the cooling medium in combination with the residual heat of the bolt, thereby improving the tempering effect and further improving the overall heat treatment quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a structural schematic diagram of the base, conveying unit and processing unit in the present invention.

[0027] Figure 3 It is a partial cross-sectional view of the base, synchronous motor, knocking member and conveying rod in the present invention.

[0028] Figure 4 It is a partial cross-sectional view of the left support plate, blocking plate, movable plate and bracket seat in the present invention.

[0029] Figure 5 It is a structural schematic diagram of the base, knocking piece, air guide plate and bracket seat in the present invention.

[0030] Figure 6 It is a partial cross-sectional view of the bracket seat, movable plate, air guide plate and brush plate in the present invention.

[0031] Figure 7 It is a partial cross-sectional view of the push plate, the knocking piece, the wedge plate and the linkage rod in the present invention.

[0032] Figure 8 It is a structural schematic diagram of the left support plate and the conveying rod in the present invention.

[0033] In the figure: 1. Base; 2. Conveying unit; 3. Processing unit; 4. Quenching furnace; 5. Cooling pool; 6. Tempering furnace; 21. Left support plate; 22. Right support plate; 23. Guide plate; 24. Conveying rod; 25. Blocking plate; 31. Driving assembly; 32. Brush plate; 33. Rubbing bar; 34. Pushing plate; 221. Synchronous motor; 232. Enclosure; 311. Bracket seat; 312. Moving plate; 313. Guide rail; 314. Push-pull plate; 315. Air guide plate; 341. Top plate; 342. Knocking piece; 343. Buffer plate; 344. Linkage rod; 345. Wedge plate. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or in the product specifications shall be followed.

[0035] See Figure 1 and Figure 2 A heat treatment structure for high-strength bolt production includes a quenching furnace 4, a cooling pool 5, a base 1 and a tempering furnace 6 arranged in sequence from right to left. The base 1 is inclined with the right higher and the left lower. A conveying unit 2 for vertically arranging the bolts and conveying them to the left in sequence is provided on the upper side of the base 1, as well as a processing unit 3 for cleaning and drying the thread grooves of the bolts.

[0036] When the bolts need to be heat treated, the conveyor moves the bolts to be quenched into the quenching furnace 4 and heats the bolts to the quenching temperature. The conveyor then conveys the high-temperature bolts into the cooling pool 5, where the bolts are cooled by the cooling medium in the cooling pool 5. The conveyor then continues to drive the quenched and cooled bolts to the left, causing the bolts to fall in batches to the right of the conveyor unit 2. The conveyor unit 2 automatically uprights the bolts vertically with the thread grooves facing downward, avoiding overlapping and blocking of the bolts, so that the thread grooves are fully exposed. At the same time, the vertically arranged bolts are conveyed to the left one by one, and the thread grooves of the bolts are brushed and cleaned by the processing unit 3 to remove the cooling medium and oxide scale remaining on the bolts. The conveyor unit 2 then conveys the bolts to the left side of the base 1 for unloading, causing the bolts to fall onto the conveyor again. The bolts are then moved along the conveyor to the tempering furnace 6 for tempering treatment. It should be noted that the conveyor adopts existing technology and can be selected according to the requirements of the specific process.

[0037] See Figure 2 、 Figure 3 and Figure 4 The conveying unit 2 includes a left support plate 21 fixedly mounted on the left end of the upper side of the base 1 and a right support plate 22 on the right end. Several groups of guide plates 23 are arranged at equal intervals between the left support plate 21 and the right support plate 22 in the front-to-back direction. Several groups of conveying rods 24 corresponding to the lower part of each group of guide plates 23 are rotatably arranged between the left support plate 21 and the right support plate 22. A blocking plate 25 is fixedly mounted on the upper right end of the guide plate 23.

[0038] See Figure 3 and Figure 4Each group of guide plates 23 is composed of two guide plates 23 arranged symmetrically in front and behind. The upper parts of the two guide plates 23 in the same group are open structures with large upper spacing and small lower spacing, and the lower parts are plate-shaped and arranged vertically in parallel. Each group of conveying rods 24 is composed of two conveying rods 24 arranged in front and behind. The minimum spacing between the two conveying rods 24 in the same group is greater than the diameter of the bolt's polished rod and less than the diameter of the bolt's head. The left part of the conveying rod 24 is a spiral structure.

[0039] Continue reading Figure 3 and Figure 4 The lower side of the blocking plate 25 is flush with the upper side of the plate structure of the guide plate 23, and the front and rear enclosures 232 are fixedly installed between the blocking plate 25 and the right support plate 22. The blocking plate 25, the enclosure 232 and the right support plate 22 are combined into a feed basket structure.

[0040] When the conveyor belt transports the bolts to the point where they fall freely, the bolts fall under the action of gravity into the interior of the feed basket structure composed of the blocking plate 25, the enclosure plate 232 and the right support plate 22. The bolts that fall thereon are guided by the opening-like structure on the upper part of the two guide plates 23 in the same group, so that the bolts are arranged horizontally along the length direction of the guide plates 23 under the action of gravity, and then the horizontally arranged bolts pass through the plate-like structure on the lower part of the two guide plates 23 in the same group and contact a group of conveying rods 24 at the corresponding position.

[0041] Subsequently, due to the spacing design of the two conveying rods 24 in the same group, the bare rod part of the bolt on the two conveying rods 24 can swing through the conveying rod 24 under the action of gravity, and the head of the bolt is blocked by the two conveying rods 24 at its upper part, so that the bolt is arranged vertically upright and the threaded part of the bolt is located at the lower part of the conveying rod 24.

[0042] In this embodiment, since the base 1 is in an inclined posture with the right side higher and the left side lower, the conveying rod 24 is also in an inclined posture with the right side higher and the left side lower, so that the bolts vertically placed on the conveying rod 24 slide to the left under the action of gravity. By arranging a vibration motor on the base 1, the guide plate 23 and the conveying rod 24 can be driven to vibrate continuously, thereby accelerating the guide plate 23 to correct the position of the fallen bolts, and at the same time accelerating the smoothness of the vertical bolts moving to the left along the conveying rod 24.

[0043] It should be noted that since the lower side of the blocking plate 25 is flush with the upper side of the plate structure of the guide plate 23, the horizontally arranged bolts placed horizontally on top of other bolts will be blocked by the right side of the blocking plate 25 when moving to the left, causing the horizontally placed bolts to fall, and then such bolts are corrected to a vertical upright arrangement through the guide plate 23.

[0044] It should also be noted that since the bolts need to be heated for a certain period of time during quenching, the conveyor belt conveys the bolts relatively slowly, so that a large number of bolts will not fall onto the conveying rod 24 at the same time, causing the conveying rod 24 to be blocked. In addition, by setting several groups of conveying rods 24 at equal intervals in the front and back, multiple bolts falling at the same time can be diverted to further prevent the bolts from gathering.

[0045] See Figure 3 A synchronous belt is wound around the right ends of all the conveying rods 24 , and a synchronous motor 221 is fixedly installed on the right side surface of the right support plate 22 , and the output shaft of the synchronous motor 221 is fixedly connected to any one of the conveying rods 24 .

[0046] When the bolt falls onto the conveying rod 24, the synchronous motor 221 is started, so that the synchronous motor 221 drives the conveying rod 24 at the corresponding position to rotate, and the conveying rod 24 drives all the conveying rods 24 to start rotating synchronously through the synchronous belt, so that the bolt that slides to the spiral part of the conveying rod 24 is actively pushed to the left by the spiral structures rotating synchronously in the same direction on the two conveying rods 24 in the corresponding group, thereby realizing the active transmission of the vertically arranged bolts one by one.

[0047] See Figure 2 、 Figure 4 、 Figure 5 and Figure 6 The processing unit 3 includes several groups of brush plates 32 and rubbing rods 33 arranged at equal intervals front and back on the upper part of the base 1 through a driving component 31. Each group of brush plates 32 is composed of two brush plates 32 arranged symmetrically front and back, and each group of rubbing rods 33 is composed of two rubbing rods 33 arranged symmetrically front and back. Each group of brush plates 32 and rubbing rods 33 corresponds one-to-one to each group of conveying rods 24.

[0048] Continue reading Figure 2 、 Figure 4 、 Figure 5 and Figure 6 The driving assembly 31 includes several groups of bracket seats 311 that are slidably arranged on the upper side of the base 1. Each group consists of two bracket seats 311 that are symmetrically arranged front to back. A movable plate 312 is provided on the upper side of the bracket seat 311 to slide up and down. A guide bar 313 is fixedly installed on the upper end of the bracket seat 311. The brush plate 32 is fixedly connected to the side of the movable plate 312 in the same group that is close to each other, and the rubbing bar 33 is slidably arranged left and right on the side of the guide bar 313 in the same group that is close to each other.

[0049] It should be noted that a number of synchronous plates corresponding to each group of bracket seats 311 are arranged on the upper side of the base 1 at equal intervals along the front-to-back direction. Both ends of the synchronous plate are hinged with hinge plates, and the end of the hinge plate away from the synchronous plate is hinged to the bracket seat 311 at the corresponding position. The rotation of the synchronous plate can drive the two bracket seats 311 in the same group to move synchronously in opposite directions through the two hinge plates at corresponding positions. The lower part of the bracket seat 311 at the front of each group is connected to a driving plate for sliding forward and backward together. A hydraulic cylinder is fixedly installed on the rear side of the base 1, and the telescopic section of the hydraulic cylinder is fixedly connected to the driving plate.

[0050] When the bolt moves to the left between the corresponding set of guide bars 313, the bolt is synchronously located between the corresponding set of brush plates 32, and then the telescopic section of the hydraulic cylinder is retracted, so that the hydraulic cylinder drives the driving plate to move backward, and the driving plate drives the bracket seat 311 located at the front in the same group to move backward synchronously, so that the two bracket seats 311 in the same group are synchronously close to each other, and the bracket seat 311 drives the moving plate 312 and the guide bar 313 to move synchronously, and the guide bar 313 drives the rubbing rod bar 33 to contact the smooth rod part of the bolt, and the moving plate 312 drives the brush plate 32 to contact the threaded part of the bolt.

[0051] It should be noted that an anti-slip strip with a large friction coefficient is fixedly installed on the side where the two rubbing bar strips 33 in the same group are close to each other, so that the rubbing bar strips 33 are in contact with the bolts through the anti-slip strip thereon.

[0052] See Figure 4 、 Figure 5 and Figure 6 An air guide plate 315 is provided on the lower side of the movable plate 312 for sliding back and forth. Two air ducts are provided inside the air guide plate 315, which are respectively connected to the air extraction system and the air supply system. An air guide duct is provided inside the movable plate 312. The brush plate 32 has a hollow structure, and the side of the brush plate 32 with bristles is provided with air holes arranged in an array.

[0053] It should be noted that the air duct on the movable plate 312 is an L-shaped structure, and the horizontal section of the L-shaped structure of the air duct is connected to the hollow structure inside the brush plate 32. The upper side surfaces of the two air ducts on the air guide plate 315 are provided with several air ports corresponding to each movable plate 312.

[0054] In the initial state where the two movable plates 312 in the same group are away from each other, the movable plate 312 drives the lower part of the vertical section of the L-shaped structure of the air guide duct on it to connect with the air port corresponding to the air duct connected to the air supply system, so that the brush plate 32 blows air toward the thread groove position of the bolt through the air holes on it in the initial state where it is not in contact with the bolt.

[0055] When the movable plate 312 drives the brush plate 32 to contact the bolt, the movable plate 312 drives the lower part of the vertical section of the L-shaped structure of the air guide channel on it to connect with the air port corresponding to the air channel connected to the exhaust system, so that the brush plate 32 is in contact with the bolt. Through the air holes on it, the cooling medium remaining inside the bolt thread groove is sucked out, thereby further increasing the drying effect.

[0056] It should be noted that an electric push rod is provided between the lower side of the air guide plate 315 and the base 1 .

[0057] When the brush plate 32 contacts the bolt, the telescopic section of the reciprocating electric push rod drives the air guide plate 315 to move up and down, and the air guide plate 315 drives the brush plate 32 to move up and down through the moving plate 312, so that the brush plate 32 can move back and forth along the axial direction of the bolt, thereby increasing the freedom of brushing the inside of the bolt thread groove, thereby improving the brushing effect.

[0058] See Figure 4 and Figure 5 A push-pull plate 314 is hinged between the brush plate 32 and the corresponding rubbing bar 33 at the upper portion, and the push-pull plates 314 on the two brush plates 32 in the same group are inclined in opposite directions.

[0059] When the brush plate 32 moves back and forth up and down relative to the rubbing bar 33, the brush plate 32 pushes the rubbing bar 33 to move left and right along the guide bar 313 at the corresponding position through the push-pull plate 314, and because the push-pull plates 314 on the two brush plates 32 in the same group are inclined in opposite directions, when the two brush plates 32 in the same group move, the two corresponding rubbing bars 33 move in the opposite direction, so that the two rubbing bars 33 in the same group rub the bolts clamped by them, thereby causing the bolts to rotate, further removing the residual coolant and oxide scale in the thread groove.

[0060] See Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 A pushing plate 34 is provided on the air guide plate 315 for sliding left and right, a top plate 341 is fixedly installed between the left support plate 21 and the blocking plate 25, a knocking member 342 is provided on the lower side of the top plate 341 for sliding up and down, a coil spring is provided between the knocking member 342 and the top plate 341, and the lower part of the knocking member 342 is a rod-shaped structure arranged in an array.

[0061] It should be noted that a buffer plate 343 corresponding to each group of conveying rods 24 is provided on the upper side of the air guide plate 315 for sliding up and down, a buffer spring is provided between the buffer plate 343 and the air guide plate 315, a through groove is provided on the knocking piece 342 for the push plate 34 to pass through, a linkage rod 344 is fixedly installed on the rear end of the upper side of the push plate 34, a wedge plate 345 for pushing the linkage rod 344 to the left is fixedly installed on the lower side of the top plate 341, and a return spring is provided between the push plate 34 and the air guide plate 315.

[0062] In the initial state, the upper side of the push plate 34 abuts against the half position of the through slot of the knocking piece 342, that is, the right part of the upper side of the push plate 34 abuts against the lower side of the knocking piece 342, and the left part of the upper side of the push plate 34 corresponds to the through slot position of the knocking piece 342, and the linkage rod 344 corresponds to the through slot position of the knocking piece 342.

[0063] When the air guide plate 315 moves upward, the air guide plate 315 lifts the bolt through the buffer plate 343 so that the head of the bolt no longer rests on the conveying rod 24. At the same time, the air guide plate 315 pushes the knocking piece 342 upward through the pushing plate 34 so that the knocking piece 342 compresses the coil spring.

[0064] When the push plate 34 drives the linkage rod 344 to move upward to contact the wedge surface of the wedge plate 345, the wedge plate 345 pushes the linkage rod 344 to the left, so that the linkage rod 344 drives the push plate 34 to move left to the position corresponding to the through groove of the knocking piece 342, so that the push plate 34 no longer supports the knocking piece 342 at this time, and the coil spring pushes the knocking piece 342 downward quickly under the action of its own elastic force. The rod-shaped structure of the knocking piece 342 knocks the bolt along the axial direction of the bolt. Because the head of the bolt does not rest on the conveying rod 24 when it is knocked, the bolt can move downward quickly when being knocked, thereby shaking off the oxide scale inside and on the surface of the bolt thread groove.

[0065] Then, if Figure 1 、 Figure 3 and Figure 8 As shown, the air guide plate 315 moves downward, so that the return spring drives the push plate 34 to move to the right and reset through its own elastic force. Then, the bolt moves to the left end of the conveying rod 24 under the conveyance of the conveying rod 24, so that the bolt moves to the left part of the left support plate 21 under the action of gravity, and falls onto the next-level conveyor belt and is conveyed to the tempering furnace 6.

[0066] See Figures 1 to 8When removing the oxide scale and residual cooling medium on the bolt, the present invention also includes the following steps. In the first step, the bolt is moved into the quenching furnace 4 and heated to the quenching temperature. Then, the conveyor belt conveys the high-temperature bolt to the cooling pool 5, and the bolt is cooled by the cooling medium in the cooling pool 5. Then, the conveyor belt conveys the bolt to the upper part of the two guide plates 23, so that the bolt is vertically arranged on the conveying rod 24 under the guidance of the guide plate 23, and the vertical bolt moves to the left along the conveying rod 24.

[0067] In the second step, the synchronous motor 221 is started to drive all the conveying rods 24 to start rotating synchronously, so that the bolts that slide to the spiral part of the conveying rod 24 are actively pushed to the left by the spiral structures that rotate synchronously in the same direction on the two conveying rods 24 in the corresponding group, thereby realizing the active transmission of the vertically arranged bolts one by one.

[0068] The third step is to contract the telescopic section of the hydraulic cylinder so that the rubbing bar 33 contacts the smooth rod part of the bolt, the brush plate 32 contacts the threaded part of the bolt, and the movable plate 312 drives the lower part of the vertical section of the L-shaped structure of the air guide channel on it to connect with the air port corresponding to the air channel connected to the exhaust system, and the brush plate 32 sucks the cooling medium remaining inside the bolt thread groove through the air holes on it.

[0069] In the fourth step, the telescopic section of the electric push rod is reciprocated to make the electric push rod drive the air guide plate 315 to move back and forth, and the air guide plate 315 drives the brush plate 32 to move up and down through the movable plate 312, so that the brush plate 32 can move back and forth along the axial direction of the bolt, thereby increasing the freedom of brushing the inside of the bolt thread groove, thereby improving the brushing effect.

[0070] In the fifth step, the brush plate 32 pushes the rubbing bar 33 to move left and right along the guide bar 313 at the corresponding position through the push-pull plate 314, so that the two rubbing bars 33 in the same group rub the bolts clamped by them, thereby causing the bolts to rotate, further removing the coolant and oxide scale remaining in the thread groove.

[0071] In the sixth step, when the air guide plate 315 moves upward, the buffer plate 343 lifts the bolt, and the push plate 34 pushes the knocking piece 342 upward. Then the wedge plate 345 pushes the linkage rod 344 to the left, so that the rod-shaped structure of the knocking piece 342 knocks the bolt along the axial direction of the bolt, thereby shaking off the oxide scale inside the bolt thread groove and on its surface.

[0072] The seventh step is to extend the telescopic section of the hydraulic cylinder so that the movable plate 312 drives the lower part of the vertical section of the L-shaped structure of the air guide channel on it to connect with the air port corresponding to the air channel connected to the air supply system, and blow air to the thread groove position of the bolt through the air holes on it to further dry the bolt.

[0073] In the eighth step, the bolt moves to the left end of the conveying rod 24 under the conveying of the conveying rod 24, so that the bolt moves to the left part of the left support plate 21 under the action of gravity, and falls on the next level conveyor belt to be conveyed to the tempering furnace 6.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0076] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0077] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat treatment structure for high-strength bolt production, comprising a quenching furnace, a cooling pool, a base and a tempering furnace arranged in sequence from right to left, characterized in that: The base is tilted with the right side higher and the left side lower. The upper side of the base is equipped with a conveying unit for arranging the bolts vertically and conveying them to the left in sequence, as well as a processing unit for cleaning and drying the thread grooves of the bolts. The conveying unit includes a left support plate fixedly mounted on the left end of the upper side of the base and a right support plate on the right end, a plurality of groups of guide plates are arranged between the left support plate and the right support plate at equal intervals in the front-to-back direction, a plurality of groups of conveying rods corresponding to the lower parts of the guide plates are rotatably arranged between the left support plate and the right support plate, and a blocking plate is fixedly mounted on the upper right end of the guide plates; The processing unit includes a plurality of groups of brush plates and rubbing bars arranged at equal intervals front and back on the upper part of the base through a driving assembly; When the bolt falls to the upper right part of each group of conveying rods, under the action of gravity, the bare rod part of the bolt passes through the corresponding group of conveying rods, and the head of the bolt is stuck in the upper part of the corresponding group of conveying rods, so that the bolt is arranged vertically. When the bolt moves to the left along the conveying rod, the brush plate cooperates with the rubbing bar to rotate and brush the threaded part of the bolt; Each group of bristle plates consists of two bristle plates arranged symmetrically front to back, and each group of rubbing rods consists of two rubbing rods arranged symmetrically front to back. Each group of bristle plates and rubbing rods corresponds to each group of conveying rods one by one. The driving assembly includes a plurality of groups of bracket seats that are slidably arranged on the upper side of the base, each group consisting of two bracket seats arranged symmetrically front to back, a movable plate is provided on the upper side of the bracket seat for sliding up and down, and a guide rail is fixedly installed on the upper end of the bracket seat; The brush plate is fixedly connected to the side where the moving plates in the same group are close to each other, and the rubbing rod strip is arranged on the side where the guide rail strips in the same group are close to each other for sliding left and right. A push-pull plate is hinged between the brush plate and the corresponding rubbing rod strip on the upper part, and the push-pull plates on the two brush plates in the same group are inclined in opposite directions.

2. A heat treatment structure for producing high-strength bolts according to claim 1, characterized in that: Each group of guide plates consists of two guide plates arranged symmetrically in front and back. The two guide plates in the same group have an open structure with a large upper spacing and a small lower spacing, and the lower parts are in the shape of plates arranged vertically and in parallel.

3. A heat treatment structure for producing high-strength bolts according to claim 2, characterized in that: The lower side of the blocking plate is flush with the upper side of the plate-like structure of the guide plate. Front and rear enclosures are fixedly installed between the blocking plate and the right support plate. The blocking plate, the enclosure and the right support plate are combined to form a feed basket structure.

4. A heat treatment structure for producing high-strength bolts according to claim 1, characterized in that: Each group of conveying rods consists of two conveying rods arranged in front and behind. The minimum distance between the two conveying rods in the same group is greater than the diameter of the bolt's polished rod and smaller than the diameter of the bolt's head. The left part of the conveying rod has a spiral structure.

5. The heat treatment structure for producing high-strength bolts according to claim 1, characterized in that: A synchronous belt is commonly wound around the right ends of all the conveying rods, a synchronous motor is fixedly mounted on the right side surface of the right support plate, and an output shaft of the synchronous motor is fixedly connected to any one of the conveying rods.

6. A heat treatment structure for producing high-strength bolts according to claim 1, characterized in that: An air guide plate is provided on the lower side of the movable plate for sliding back and forth. Two air ducts are provided inside the air guide plate, which are respectively connected to the air extraction system and the air supply system. An air guide duct is provided inside the movable plate. The bristle plate has a hollow structure. The side of the bristle plate with bristles is provided with air holes arranged in an array.

7. A heat treatment structure for producing high-strength bolts according to claim 6, characterized in that: A push plate is provided on the air guide plate for sliding left and right, a top plate is fixedly installed between the left support plate and the blocking plate, a knocking piece is provided on the lower side of the top plate for sliding up and down, a coil spring is provided between the knocking piece and the top plate, and the lower part of the knocking piece is a rod-shaped structure arranged in an array.

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