A preparation process and equipment for bainite reinforced steel shot

Abstract

The present invention discloses a preparation process and equipment for bainite reinforced steel shot, and relates to the technical field of reinforced steel shot production. The specific steps are as follows: Step 1: Select scrap steel with a carbon content of less than 0.2%; Step 2: Place molten steel in a centrifugal device and throw it out; Step 3: Cool the steel shot; Step 4: Dry and select the steel shot. The present invention adopts bainite reinforced shot structure, which has fine structure, high hardness, good elasticity, and longer service life. The carbon content of bainite steel shot is only between 0.12% and 0.19%, and the whole process from production process to use process is energy-saving, low-carbon, green, and environmentally friendly. The equipment described in the present invention is convenient for achieving the effect of secondary quenching of steel shot after one-time pouring and centrifugal throwing out. The equipment structure is refined, the functional integration degree is high, and the production cost can be greatly saved.

Description

Technical Field

[0001] The invention relates to the technical field of strengthening steel shot production, in particular to a preparation process and equipment for bainite strengthening steel shot. Background Art

[0002] At present, in the equipment manufacturing industry, equipment parts in many fields, such as gears for new energy vehicles, leaf springs for commercial vehicles, high-end wear-resistant parts on trains and other equipment, all require high-hardness, long-life steel shots for cleaning, rust removal, stress elimination or surface optimization and other processing operations. Due to the high carbon content, national standard steel shots have high hardness when not tempered, but low strength and are easy to break when used, resulting in high cost of use and environmental pollution, and limited strengthening effect. In order to improve the strength of steel shots, high-carbon steel wire can also be used to prepare steel shots. The specific production process is as follows:

[0003] High carbon steel wire drawing → vacuum tempering → wire drawing → vacuum tempering → wire drawing → cutting → rounding → screening → packaging;

[0004] Although high-carbon steel wire reinforced shots have the advantages of high hardness and high strength, their preparation cost is high and the process flow is long and complicated, which invisibly raises the application threshold.

[0005] In order to improve the hardness of the reinforced shot and reduce the cost, a preparation process and equipment for bainite reinforced steel shot are provided. Summary of the invention

[0006] The purpose of the present invention is to provide a preparation process and equipment for bainite reinforced steel shot in order to improve the hardness of the reinforced shot and reduce the cost.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A preparation device for bainite reinforced steel shot comprises a centrifugal device, the centrifugal device comprises a cold water pool, a centrifuge is installed in the cold water pool, a mounting frame is fixedly connected to the top of the cold water pool, molten steel is injected into the centrifuge through a feeding mechanism, a water curtain ring is formed by the water feeding mechanism, the feeding mechanism comprises a connecting groove, the connecting groove is opened at the top of the mounting frame, a circular groove is opened at the bottom end of the connecting groove, a feeding pipe is connected to the inner wall of the connecting groove, a disc is fixedly connected to the bottom end of the outer wall of the feeding pipe, the top of the mounting frame is located on the outside of the feeding pipe and is fixedly connected to a fixing ring, and a feeding hopper is arranged above the feeding pipe.

[0009] As a further solution of the present invention: the feeding mechanism also includes a guide frame, which is symmetrically fixedly connected to the top of the fixing ring, the inner wall of the guide frame is slidably connected with an insert block, the outer wall of the insert block is provided with a reinforcement groove, the outer walls of both sides of the feeding pipe are symmetrically provided with slots, the bottom end of the feeding hopper is fixedly connected with a connecting head, the top of the feeding pipe is provided with a threaded groove, the inside of the feeding pipe is slidably connected with a reinforcement block, the top of the reinforcement block extends to the inner cavity of the threaded groove, the bottom end of the reinforcement block extends to the inner cavity of the slot, and the outer wall of the reinforcement block is fixedly connected with an elastic sheet.

[0010] As a further scheme of the present invention: the water inlet mechanism includes a mounting hole, which is symmetrically opened on the outer wall of the feed pipe, and the mounting hole is located below the slot, and the inner wall of the mounting hole is provided with a water inlet groove, one end of the water inlet groove extends to the outer wall of the feed pipe, the interior of the fixing ring is symmetrically and slidably connected with the mounting tube, and the ends of the mounting tubes away from each other are connected to the water inlet pipe through a connecting flange, the top of the mounting tube is fixedly connected to a limiting plate, the interior of the fixing ring is provided with a limiting groove for the limiting plate to slide, the interior of the limiting plate is slidably connected with a positioning block extending to the top of the limiting plate, a positioning spring is connected between the positioning block and the limiting plate, a sealing airbag is installed on the outer wall of the end of the mounting tube away from the connecting flange, and an extrusion ring is slidably connected to the interior of the mounting tube on one side of the sealing airbag, the outer wall of the extrusion ring is fixedly connected with a push rod, the push rod extends out of the connecting flange, and the outer wall of the push rod is fixedly connected with a protrusion.

[0011] As a further solution of the present invention: the outer wall of the feed pipe is in contact with the inner wall of the connecting groove.

[0012] As a further solution of the present invention: the inner wall of the guide frame fits with the outer wall of the insert block, the insert block is L-shaped, and the outer wall of one end of the insert block fits with the inner wall of the slot.

[0013] As a further solution of the present invention: the outer wall of the connecting head is provided with an external thread, and the external thread matches the thread groove.

[0014] As a further solution of the present invention: the outer wall of the bottom end of the reinforcement block is in contact with the inner wall of the reinforcement groove.

[0015] As a further solution of the present invention: the outer wall of the limiting plate is in contact with the inner wall of the limiting groove, and the inner wall of the mounting hole is in contact with the outer wall of the mounting tube.

[0016] As a further solution of the present invention: a tooth groove is provided at the top of the inner wall of the limiting groove, the top of the positioning block is engaged with the tooth groove, and an inclined surface is provided at one end of the protrusion facing the positioning block.

[0017] A preparation process of bainite reinforced steel shot, the specific steps are as follows:

[0018] Step 1: Select scrap steel with carbon content less than 0.2%, such as 195 cold plate, 20 chrome-molybdenum scraps, industrial motors, transformer scraps, and melt them into molten steel to make the molten steel composition C content 0.1%-0.2%, S content <0.03%, P content <0.03%, Si content 0.2%-0.45%, Mn content 0.35%-1.5%, the above contents are mass fractions; beneficial substances in the scrap steel such as chromium, molybdenum, silicon, and manganese are preserved, and appropriate additions can be made when they are not reached;

[0019] Step 2: Place the molten steel in a centrifugal device and throw it out to form round particles. A circular water curtain can be formed above the centrifugal device, so that the steel shot with a temperature of 1100-1250 degrees Celsius when thrown out contacts the circular water curtain to achieve a primary quenching, and then falls into water with a water temperature of 18-35 degrees Celsius to achieve a secondary quenching. At this time, the temperature of the steel shot is 880-980 degrees Celsius, and the product is formed at this time;

[0020] Step 3: The steel shot is cooled in the circulating water at 18-35 degrees Celsius. This ensures that the hardness of the steel shot in the same batch is uniform and the quality is guaranteed. It is critical to cool the circulating water. The pumping port and the water inlet of the circulating water must be on the opposite side to allow the water to flow in the water, which is conducive to the rapid cooling of the water for cooling the steel shot. If the steel shot cannot be cooled quickly, the hardness will be low, thus affecting the life;

[0021] Step 4: After the steel shot is dried and rounded, it is added to a special shot blasting machine. Thirteen manganese steel plates are used as linings for shot blasting for 30 minutes to remove stress, and a small amount of empty shells and inwardly shrunken steel shots are separated in the fine screen to obtain the finished product.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention utilizes scrap steel to melt into molten steel, and then performs quenching and tempering, centrifugally throws out and quenches twice to obtain steel shots with bainite-reinforced shot structure. The bainite-reinforced shot structure of the steel shot is fine, hard, elastic, and has a longer service life. It has the advantages of saving electricity, energy, and labor during use. Since bainite steel shots will only become smaller and smaller as they are thrown, but are not easy to break, the dust is smaller and more environmentally friendly. In the production process, there is no need to increase carbon to achieve strength like national standard steel shots (the carbon content of national standard steel shots is 1.2%-0.85%), and the carbon content of the bainite steel shots obtained by the present invention is only 0.12%-0.19%, so that the entire process from production to use has the characteristics of energy saving, low carbon, green, and environmental protection.

[0024] 2. By setting a feeding mechanism and a water inlet mechanism, when the disc is located in the circular groove, the space in the circular groove forms an annular water trough, and the cold water in the water inlet pipe flows into the mounting hole through the mounting pipe, and then flows into the annular water trough through the water inlet trough. The cold water flows down through the annular water trough to form an annular water curtain on the outside of the centrifuge. After the molten steel is thrown out of the centrifuge, it forms a steel shot with a temperature of 1100-1250 degrees Celsius. The steel shot first contacts the annular water curtain to achieve a primary quenching, and then falls into the water with a water temperature of 18-35 degrees Celsius to achieve a secondary quenching. At this time, the temperature of the steel shot is 880-980 degrees Celsius. The equipment of the present invention is convenient for achieving the effect of secondary quenching of steel shots after a single pouring and centrifugal throwing. The equipment has a refined structure, a high degree of functional integration, and can greatly save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the mounting frame of the present invention;

[0027] Figure 3 It is a schematic diagram of the installation of the feed pipe of the present invention;

[0028] Figure 4 It is a schematic diagram of the installation of the plug block of the present invention;

[0029] Figure 5 It is a schematic diagram of the internal structure of the feed pipe of the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of the fixing ring of the present invention;

[0031] Figure 7 It is a schematic diagram of the internal structure of the installation tube of the present invention;

[0032] Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle.

[0033] In the figure: 1. cold water tank; 2. centrifuge; 3. mounting frame; 4. feeding mechanism; 401. connecting groove; 402. circular groove; 403. feeding pipe; 404. disc; 405. fixing ring; 406. feeding hopper; 407. guide frame; 408. plug block; 409. reinforcement groove; 410. slot; 411. connector; 412. threaded groove; 413. reinforcement block; 414. elastic sheet; 5. water inlet mechanism; 501. mounting hole; 502. water inlet groove; 503. mounting pipe; 504. water inlet pipe; 505. connecting flange; 506. limiting plate; 507. limiting groove; 508. positioning block; 509. positioning spring; 510. sealing airbag; 511. extrusion ring; 512. push rod; 513. bump. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0036] See also Figures 1 to 8 In an embodiment of the present invention, a preparation process of a bainite reinforced steel shot comprises the following specific steps:

[0037] Step 1: Select scrap steel with a carbon content of less than 0.2% (such as 195 cold plate, 20 chrome-molybdenum scraps, industrial motors, transformer scrap steel sheets) and melt them into molten steel, and then perform quenching and tempering treatment on the molten steel to make the molten steel composition C content 0.1%-0.2%, S content <0.03%, P content <0.03%, Si content 0.2%-0.45%, Mn content 0.35%-1.5%, the above contents are mass fractions; beneficial substances in the scrap steel such as chromium, molybdenum, silicon, and manganese are preserved, and appropriate additions can be made when they are not reached;

[0038] Step 2: Place the molten steel in a centrifugal device and throw it out to form round particles. A circular water curtain can be formed above the centrifugal device, so that the steel shot with a temperature of 1100-1250 degrees Celsius when thrown out contacts the circular water curtain to achieve a primary quenching, and then falls into water with a water temperature of 18-35 degrees Celsius to achieve a secondary quenching. At this time, the temperature of the steel shot is 880-980 degrees Celsius, and the product is formed at this time;

[0039] Step 3: Cool the steel shot in circulating water at 18-35 degrees Celsius, which can ensure the uniform hardness of the steel shot in the same batch and ensure the quality. Cooling the circulating water is very important. The pumping port and the water inlet of the circulating water must be on opposite sides, which is conducive to the rapid cooling of the water for cooling the steel shot. Otherwise, the steel shot cannot be cooled quickly, the hardness will be low and the service life will be affected.

[0040] Step 4: After the steel shot is dried and rounded, it is added to a special shot blasting machine. Thirteen manganese steel plates are used as linings for shot blasting for 30 minutes to remove stress, and a small amount of empty shells and inwardly shrunken steel shots are separated in the fine screen to obtain the finished product.

[0041] In this embodiment: the quenching process in step 2 is a process of centrifugal pouring to achieve secondary quenching, which saves production costs such as electricity, water resources, and manpower, and also adds more oxides; in step 4, the liner of the special shot blasting machine is made of rolled thirteen manganese steel plate, and the hardness of the produced steel shot is enhanced by HRC2-3 degrees compared with that without shot blasting, which can achieve the effect of 70A steel wire reinforced grinding shot, and the service life will be slightly longer than that of steel wire grinding shot.

[0042] During the cold drawing process of high carbon steel wire, the structure of the steel is damaged, many gaps are formed, and the service life of the steel shot is affected. The bainite reinforced steel shot obtained by this process has a fine structure, and the microstructure is mainly lower bainite and lath martensite, which makes the steel shot have high hardness, good elasticity and longer service life.

[0043] A preparation device for bainite reinforced steel shot includes a centrifugal device, the centrifugal device includes a cold water pool 1, a centrifuge 2 is installed in the cold water pool 1, a mounting frame 3 is fixedly connected to the top of the cold water pool 1, molten steel is injected into the centrifuge 2 through a feeding mechanism 4, and a water curtain ring is formed through a water feeding mechanism 5. The feeding mechanism 4 includes a connecting groove 401, the connecting groove 401 is opened at the top of the mounting frame 3, a circular groove 402 is opened at the bottom of the connecting groove 401, a feeding pipe 403 is connected to the inner wall of the connecting groove 401, a disc 404 is fixedly connected to the bottom end of the outer wall of the feeding pipe 403, a fixing ring 405 is fixedly connected to the top of the mounting frame 3 located outside the feeding pipe 403, and a feeding hopper 406 is arranged above the feeding pipe 403.

[0044] The feeding mechanism 4 also includes a guide frame 407, which is symmetrically fixedly connected to the top of the fixing ring 405, and the inner wall of the guide frame 407 is slidably connected with an insert block 408, and the outer wall of the insert block 408 is provided with a reinforcement groove 409, and the outer walls of both sides of the feed pipe 403 are symmetrically provided with slots 410, the bottom end of the feed hopper 406 is fixedly connected with a connector 411, and the top of the feed pipe 403 is provided with a threaded groove 412, and the inside of the feed pipe 403 is slidably connected with a reinforcement block 413, the top of the reinforcement block 413 extends to the inner cavity of the threaded groove 412, and the bottom of the reinforcement block 413 extends to the inner cavity of the slot 410, and the outer wall of the reinforcement block 413 is fixedly connected with an elastic sheet 414.

[0045] In this embodiment: when installing the equipment, the feed pipe 403 is passed through the circular groove 402 and connected into the connection groove 401. After completion, the plug block 408 is pushed to move in the opposite direction of the guide frame 407, and the plug block 408 is moved and inserted into the slot 410 to fix the feed pipe 403. Then, the connector 411 is connected into the threaded groove 412, and the feed hopper 406 is fixedly installed on the top of the feed pipe 403. During this process, the connector 411 contacts the reinforcement block 413, pushing the reinforcement block 413 to move, squeezing the elastic sheet 414, and the reinforcement block 413 is engaged into the reinforcement groove 409 to reinforce the plug block 408 to prevent the plug block 408 from moving out of the slot 410 during use. The molten steel in the ladle is poured into the feed hopper 406, and the molten steel flows into the centrifuge 2 along the feed hopper 406 and the feed pipe 403 for centrifugal operation.

[0046] Please refer to Figures 5 to 8The water inlet mechanism 5 includes a mounting hole 501, which is symmetrically opened on the outer wall of the feed pipe 403. The mounting hole 501 is located below the slot 410. The inner wall of the mounting hole 501 is provided with a water inlet groove 502, one end of the water inlet groove 502 extends to the outer wall of the feed pipe 403, the interior of the fixing ring 405 is symmetrically slidably connected with the mounting pipe 503, and the ends of the mounting pipe 503 that are away from each other are connected to the water inlet pipe 504 through the connecting flange 505. The top of the mounting pipe 503 is fixedly connected to the limit plate 506, and the interior of the fixing ring 405 is provided with a limit plate 506. A limiting groove 507 is provided for sliding, and the limiting plate 506 is internally slidably connected with a positioning block 508 extending to the top of the limiting plate 506, a positioning spring 509 is connected between the positioning block 508 and the limiting plate 506, a sealing airbag 510 is installed on the outer wall of the end of the mounting tube 503 away from the connecting flange 505, and an extrusion ring 511 is slidably connected to one side of the sealing airbag 510 inside the mounting tube 503, and a push rod 512 is fixedly connected to the outer wall of the extrusion ring 511, and the push rod 512 extends out of the connecting flange 505, and a protrusion 513 is fixedly connected to the outer wall of the push rod 512.

[0047] In this embodiment: when the equipment is being filled with water, the installation tube 503 is pushed to move, and the installation tube 503 moves and is inserted into the installation hole 501. At this time, the limit plate 506 slides in the limit groove 507. After completion, the water inlet pipe 504 is installed at one end of the installation tube 503, and the water inlet pipe 504 contacts the push rod 512, pushing the push rod 512 to move, and the push rod 512 moves to drive the extrusion ring 511 to move, and the extrusion ring 511 moves to squeeze the sealing airbag 510. After the sealing airbag 510 is compressed, the outer peripheral wall squeezes the inner wall of the installation hole 501, thereby improving the sealing between the installation hole 501 and the installation tube 503. At the same time, the push rod 512 moves to drive the protrusion 513 to move, and the protrusion 513 moves to contact the bottom end of the positioning block 508, so that the positioning block 508 moves up and engages with the limit groove 507, and the position of the installation tube 503 is fixed.

[0048] When the disc 404 is located in the circular groove 402, an annular water groove is formed in the space between the disc 404 and the circular groove 402. The high-pressure cold water in the water inlet pipe 504 flows into the mounting hole 501 through the mounting pipe 503, and then flows into the annular water groove through the water inlet groove 502. The cold water flows down through the annular water groove to form an annular water curtain on the outside of the centrifuge 2.

[0049] After the molten steel is thrown out by the centrifuge 2, it forms steel shots with a temperature of 1100-1250 degrees Celsius. The steel shots first contact with the annular water curtain to achieve primary quenching, and then fall into water with a water temperature of 18-35 degrees Celsius to achieve secondary quenching. At this time, the temperature of the steel shots is 880-980 degrees Celsius. This equipment is convenient for achieving the effect of secondary quenching of steel shots after primary pouring and centrifugal throwing, which greatly saves production costs.

[0050] Please refer to Figures 3 to 5 The outer wall of the feed pipe 403 fits with the inner wall of the connecting groove 401 , the inner wall of the guide frame 407 fits with the outer wall of the plug block 408 , the plug block 408 is L-shaped, and the outer wall of one end of the plug block 408 fits with the inner wall of the slot 410 .

[0051] In this embodiment: the feed tube 403 is passed through the circular groove 402 and connected into the connecting groove 401. After completion, the plug block 408 is pushed to move in the opposite direction of the guide frame 407, and the plug block 408 is moved and inserted into the slot 410 to fix the feed tube 403.

[0052] Please refer to Figures 3 to 5 The outer wall of the connector 411 is provided with an external thread, which matches the thread groove 412 , and the outer wall of the bottom end of the reinforcement block 413 fits with the inner wall of the reinforcement groove 409 .

[0053] In this embodiment: the connecting head 411 is connected into the threaded groove 412, and the feed hopper 406 is fixedly installed on the top of the feed pipe 403. During this process, the connecting head 411 contacts the reinforcement block 413, pushing the reinforcement block 413 to move, squeezing the elastic sheet 414, and the reinforcement block 413 is engaged into the reinforcement groove 409 to reinforce the insert block 408.

[0054] Please refer to Figures 5 to 8 The outer wall of the limiting plate 506 fits with the inner wall of the limiting groove 507 , and the inner wall of the mounting hole 501 fits with the outer wall of the mounting tube 503 .

[0055] In this embodiment, the installation tube 503 is pushed to move, and the installation tube 503 is moved and inserted into the installation hole 501 . At this time, the limiting plate 506 slides in the limiting groove 507 .

[0056] Please refer to Figures 5 to 8 A tooth groove is provided at the top of the inner wall of the limiting groove 507 , and the top of the positioning block 508 is engaged with the tooth groove. An inclined surface is provided at one end of the protrusion 513 facing the positioning block 508 .

[0057] In this embodiment: the water inlet pipe 504 is installed at one end of the mounting tube 503, the water inlet pipe 504 contacts the push rod 512, pushing the push rod 512 to move, the movement of the push rod 512 drives the protrusion 513 to move, when the protrusion 513 moves, the inclined surface of the protrusion 513 contacts the bottom end of the positioning block 508, so that the positioning block 508 moves up and engages with the tooth groove in the limit groove 507, thereby fixing the position of the mounting tube 503.

[0058] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A preparation device for bainite reinforced steel shot, characterized in that: The centrifugal device comprises a cooling water pool (1), a centrifuge (2) is installed in the cooling water pool (1), a mounting frame (3) is fixedly connected to the top of the cooling water pool (1), molten steel is injected into the centrifuge (2) through a feeding mechanism (4), a water curtain ring is formed by a water feeding mechanism (5), the feeding mechanism (4) comprises a connecting groove (401), the connecting groove (401) is opened at the top of the mounting frame (3), a circular groove (402) is opened at the bottom end of the connecting groove (401), a feeding pipe (403) is connected to the inner wall of the connecting groove (401), a disc (404) is fixedly connected to the bottom end of the outer wall of the feeding pipe (403), a fixing ring (405) is fixedly connected to the top of the mounting frame (3) located outside the feeding pipe (403), and a feeding hopper (406) is arranged above the feeding pipe (403); The feeding mechanism (4) further comprises a guide frame (407), wherein the guide frame (407) is symmetrically fixedly connected to the top end of the fixing ring (405), an insert block (408) is slidably connected to the inner wall of the guide frame (407), an outer wall of the insert block (408) is provided with a reinforcement groove (409), and slots (410) are symmetrically provided on the outer walls of both sides of the feeding pipe (403), a connector (411) is fixedly connected to the bottom end of the feeding hopper (406), a thread groove (412) is provided at the top end of the feeding pipe (403), a reinforcement block (413) is slidably connected to the inside of the feeding pipe (403), the top end of the reinforcement block (413) extends to the inner cavity of the thread groove (412), the bottom end of the reinforcement block (413) extends to the inner cavity of the slot (410), and the outer wall of the reinforcement block (413) is fixedly connected to an elastic sheet (414); The water inlet mechanism (5) comprises a mounting hole (501), the mounting hole (501) being symmetrically opened on the outer wall of the feed pipe (403), the mounting hole (501) being located below the slot (410), the inner wall of the mounting hole (501) being opened with a water inlet groove (502), one end of the water inlet groove (502) extending to the outer wall of the feed pipe (403), the interior of the fixing ring (405) being symmetrically slidably connected with the mounting pipe (503), one end of the mounting pipe (503) being remote from each other being connected with the water inlet pipe (504) via a connecting flange (505), the top end of the mounting pipe (503) being fixedly connected with a limiting plate (506), the interior of the fixing ring (405) being opened with a flange for the limiting plate (506) to be inserted into the fixing ring (405). ) is provided with a limit groove (507) for sliding, the limit plate (506) is internally slidably connected with a positioning block (508) extending to the top of the limit plate (506), a positioning spring (509) is connected between the positioning block (508) and the limit plate (506), a sealing airbag (510) is installed on the outer wall of one end of the mounting tube (503) away from the connecting flange (505), an extrusion ring (511) is slidably connected to the inside of the mounting tube (503) on one side of the sealing airbag (510), a push rod (512) is fixedly connected to the outer wall of the extrusion ring (511), the push rod (512) extends out of the connecting flange (505), and a protrusion (513) is fixedly connected to the outer wall of the push rod (512); The outer wall of the limiting plate (506) fits with the inner wall of the limiting groove (507), and the inner wall of the mounting hole (501) fits with the outer wall of the mounting tube (503); A tooth groove is provided at the top end of the inner wall of the limiting groove (507), the top end of the positioning block (508) is engaged with the tooth groove, and an inclined surface is provided at one end of the protrusion (513) facing the positioning block (508).

2. The preparation equipment of bainite reinforced steel shot according to claim 1, characterized in that: The outer wall of the feeding pipe (403) fits in contact with the inner wall of the connecting groove (401).

3. The preparation equipment of bainite reinforced steel shot according to claim 1, characterized in that: The inner wall of the guide frame (407) fits with the outer wall of the insert block (408); the insert block (408) is L-shaped; the outer wall of one end of the insert block (408) fits with the inner wall of the slot (410).

4. The preparation equipment of bainite reinforced steel shot according to claim 1, characterized in that: The outer wall of the connecting head (411) is provided with an external thread, and the external thread matches the thread groove (412).

5. The equipment for preparing bainite reinforced steel shot according to claim 1, characterized in that: The outer wall of the bottom end of the reinforcement block (413) fits the inner wall of the reinforcement groove (409).

6. A process for preparing bainite reinforced steel shot according to a bainite reinforced steel shot preparation device according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: Step 1: Select scrap steel with a carbon content of less than 0.2%, melt it into molten steel, and then temper the molten steel to make the C content in the molten steel 0.1%-0.2%, the S content <0.03%, the P content <0.03%, the Si content 0.2%-0.45%, and the Mn content 0.35%-1.5%, and the above contents are mass fractions; Step 2: Place the molten steel in a centrifugal device and throw it out to form round particles. A circular water curtain can be formed above the centrifugal device, so that the steel shot with a temperature of 1100-1250 degrees Celsius when thrown out contacts the circular water curtain to achieve a primary quenching, and then falls into water with a water temperature of 18-35 degrees Celsius to achieve a secondary quenching. At this time, the temperature of the steel shot is 880-980 degrees Celsius, and the product is formed at this time; Step 3: The steel shot is cooled in circulating water at 18-35 degrees Celsius; Step 4: After the steel shot is dried and rounded, it is added to a special shot blasting machine. Thirteen manganese steel plates are used as linings for shot blasting for 30 minutes to remove stress, and a small amount of empty shells and inwardly shrunken steel shots are separated in the fine screen to obtain the finished product.

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