A grab for scrap metal recycling

Abstract

The present application relates to the technical fields of hydraulic grab bucket, and discloses a grab steel machine for recycling waste metal, which comprises a grab bucket body and a construction machine movable arm, the grab bucket body is fixedly installed with a self-adaptive connecting seat, the end of the construction machine movable arm is hingedly connected with a butt joint seat, the butt joint seat is provided with a hook groove with an opening facing the construction machine movable arm and a matching part outwardly arranged from the bottom of the hook groove, a round shaft and a plug-in part are correspondingly arranged on the self-adaptive connecting seat, a side plate is arranged on the self-adaptive connecting seat, a connecting hole is formed in the side plate, a sliding pin is slidably installed in the matching part, a second hydraulic rod is installed on the construction machine movable arm, the mechanical rough positioning of the round shaft into the hook groove and the plug-in of the matching part is achieved, the hydraulic butt joint of the automatic plug-in of the oil circuit hard pipe is matched, the rigid connection of the grab bucket and the movable arm and the on-off of the high-pressure hydraulic oil circuit can be simultaneously completed through only one overturning action of the movable arm, manual assistance for plugging the oil pipe is not needed, and the replacement time of the device is shortened.

Description

Technical Field

[0001] This invention relates to the field of hydraulic grab technology, specifically a steel grabber for scrap metal recycling. Background Technology

[0002] With the acceleration of industrialization and the popularization of the concept of circular economy, the scrap metal recycling industry has developed rapidly. As a kind of efficient special engineering machinery, steel grabbers are widely used in steel plants, shipyards, scrap recycling stations and other places. They are mainly used for grabbing, handling, stacking and feeding large metal components such as scrapped cars, steel structure workshops and scrapped ships.

[0003] Existing steel grabbers typically consist of two parts: the mechanical boom and the grab bucket body. The grab bucket body is usually rigidly connected to the end of the boom via pins or flanges. In actual engineering applications, traditional rigid connections usually require the use of wrenches, hammers, and other tools to disassemble multiple sets of high-strength bolts or pins, which is cumbersome and time-consuming.

[0004] In modern large-scale recycling sites, a single excavator often needs to frequently change various attachments such as hydraulic shears, breakers, and grabs to adapt to different operational needs. Traditional connection methods cannot meet the requirements for rapid attachment changes, which seriously affects the utilization rate and operational efficiency of the equipment. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a steel grabber for scrap metal recycling.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A scrap metal grabber includes a grab bucket body and a mechanical boom. An adaptive connecting seat is fixedly mounted on the grab bucket body. A docking seat is hinged to the end of the mechanical boom. The docking seat has a groove opening towards the mechanical boom and a fitting portion extending outward from the bottom of the groove. The adaptive connecting seat has a round shaft adapted to the groove and a fitting portion that engages with the fitting portion. Symmetrically arranged side plates are also fixedly mounted on the adaptive connecting seat. Connecting holes are provided on the side plates. A sliding pin is slidably installed within the fitting portion. When the fitting portion and the fitting portion are docked, the sliding pin extends into the connecting hole under the drive of a driving component to achieve secondary locking. A second hydraulic rod is mounted on the mechanical boom. The movable end of the second hydraulic rod drives the docking seat to rotate around its hinge point with the mechanical boom, causing the round shaft to engage in the groove and the fitting portion to dock with the fitting portion, achieving a quick locking connection between the grab bucket body and the mechanical boom.

[0007] As a preferred technical solution of this application, the insertion part includes two first limiting plates arranged in parallel and spaced apart, and an insertion seat disposed between the two first limiting plates. A limiting post is fixedly installed on the insertion seat, and a positioning hole for the insertion post to be inserted is correspondingly opened on the fitting part.

[0008] As a preferred technical solution of this application, the limiting post includes a post body, an insert sleeve is fixedly installed in the opening of the post body, a metal rod is slidably installed coaxially in the insert sleeve, a wedge block is fixedly installed at one end of the metal rod that extends into the insert sleeve, the insert sleeve has at least one mounting hole in the radial direction, a positioning pin is slidably installed in the mounting hole, and the inner end face of the positioning pin abuts against the inclined surface of the wedge block; a first electromagnetic coil is pre-embedded in the positioning hole, when the limiting post is inserted into the positioning hole and the first electromagnetic coil is energized, the metal rod is driven axially by magnetic force, which drives the wedge block to push the positioning pin so that it extends radially and locks on the inner end face of the fitting part.

[0009] As a preferred technical solution of this application, a return spring is provided between the end of the metal rod away from the wedge block and the bottom of the embedded sleeve.

[0010] As a preferred technical solution of this application, the driving component includes a second electromagnetic coil pre-embedded in the docking seat and a metal shaft passing through the second electromagnetic coil. A limiting sleeve is also fixedly installed in the docking seat, and the sliding pin is slidably installed in the limiting sleeve. One end of the metal shaft is hinged to the side wall of the sliding pin through a connecting rod arm. When the second electromagnetic coil is energized, the metal shaft is driven to move by magnetic force, and the sliding pin is driven to extend into the connecting hole through the connecting rod arm.

[0011] As a preferred technical solution of this application, a positioning seat is fixedly installed on the opposite surfaces of the two first limiting plates, and the plug-in seat is elastically connected to the positioning seat by a tension spring; the plug-in seat has a through hydraulic channel inside, and an oil inlet pipe and an oil outlet pipe connected to the hydraulic channel are fixed on its outer wall respectively, and the fitting part is provided with a first through hole and a second through hole through which the oil inlet pipe and the oil outlet pipe pass through the plug-in respectively.

[0012] As a preferred technical solution of this application, an O-ring is fitted on the outer peripheral wall of the oil inlet pipe and the oil outlet pipe. When the oil inlet pipe and the oil outlet pipe pass through the fitting part, the O-ring is press-fitted with the inner wall of the first through hole and the second through hole to form a hydraulic seal.

[0013] As a preferred technical solution of this application, the grab body includes a central column, at least two first mounting seats and second mounting seats are respectively installed at both ends of the central column, a jaw plate is hinged in the first mounting seat, a first hydraulic rod is hinged in the second mounting seat, and the movable end of the second mounting seat is hinged to the jaw plate to drive the jaw plate to open and close; a main oil passage is opened in the central column, and the main oil passage is connected to the first hydraulic rod through a hose.

[0014] The beneficial effects of this invention are: 1. Through mechanical coarse positioning by inserting the round shaft into the hook groove and the fitting part, and with hydraulic docking by automatic insertion of the hydraulic hard pipe, the rigid connection between the grab and the boom and the on / off of the high-pressure hydraulic oil circuit can be completed simultaneously with just one flipping action of the boom. There is no need for manual assistance in inserting and removing oil pipes, which solves the problems of cumbersome disassembly and assembly, hydraulic oil spillage and easy damage to pipelines in traditional connection methods, and shortens the replacement time of the device.

[0015] 2. It adopts a dual insurance mechanism of mechanical bearing and electromagnetic locking. The round shaft and hook groove bear the main shear force, and the positioning pin in the limiting column is radially tightened under electromagnetic drive to achieve the first level of anti-disengagement. The sliding pin is inserted into the side plate connecting hole under the drive of the connecting rod to achieve the second level of anti-disengagement. Even in the case of high-frequency violent impact or accidental power failure, the mechanical structure still remains locked, effectively reducing the risk of the grab bucket falling from a height.

[0016] 3. The plug-in connector is elastically connected to the limit plate through a tension spring, which gives the hydraulic quick-change interface a certain amount of floating and self-aligning capability. At the moment of docking, this structure can buffer the impact of the hard pipe and the through hole, avoiding the bending or cracking of the oil pipe. During operation, it can absorb some vibration energy and extend the service life of hydraulic pipelines and seals. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the boom and docking seat structure of the engineering machinery of the present invention; Figure 3 This is a schematic diagram of the adaptive connector structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the limiting post of the present invention; Figure 5 This is a schematic diagram of the internal structure of the fitting part of the present invention; Figure 6 This is a schematic diagram of the grab bucket body structure of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 10. Grab body; 11. Central column; 111. Main oil passage; 12. First mounting bracket; 13. Second mounting bracket; 14. Jaw plate; 15. First hydraulic rod; 16. Hose; 20. Construction machinery boom; 21. Second hydraulic rod; 30. Adaptive connector; 31. Round shaft; 32. Insertion part; 321. First limiting plate; 322. Insertion seat; 323. Positioning seat; 324. Tension spring; 325. Oil inlet pipe; 326. Oil outlet pipe; 302. O-ring seal; 327. Limiting post; 3271. Post body; 3272. Embedded sleeve; 3273. Metal rod; 3274. Wedge block; 301. Mounting hole; 3275. Positioning pin; 3276. Return spring; 33. Side plate; 331. Connecting hole; 40. Docking seat; 41. Hook groove; 42. Fitting part; 421. First through hole; 422. Second through hole; 423. Positioning hole; 424. First electromagnetic coil; 425. Second electromagnetic coil; 43. Sliding pin; 44. Metal shaft; 45. Limiting sleeve; 46. Connecting rod arm. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Example 1

[0021] like Figure 1 - Figure 6 As shown, the present invention provides a steel grabber for scrap metal recycling, comprising a grab bucket body 10, an engineering machinery boom 20, and a quick-locking interface connecting the two.

[0022] Specifically, an adaptive connecting seat 30 is fixedly installed on the grab body 10. The adaptive connecting seat 30 serves as the main structure for transmitting loads on the grab body 10. Correspondingly, a docking seat 40 is hinged to the end of the engineering machinery boom 20. The docking seat 40 has a hook groove 41 with an opening facing the engineering machinery boom 20 and an engagement part 42 arranged outward from the bottom of the hook groove 41. The adaptive connecting seat 30 is correspondingly provided with a round shaft 31 that matches the hook groove 41 and an insertion part 32 that engages with the engagement part 42. The adaptive connecting seat 30 is also fixedly installed with symmetrically arranged side plates 33. The side plates 33 have connecting holes 331. A sliding pin 43 is slidably installed in the engagement part 42. When the engagement part 42 and the insertion part 32 are docked, the sliding pin 43 extends into the connecting hole 331 under the drive of the driving component to achieve secondary locking.

[0023] In order to achieve relative rotation and attitude adjustment between the grab body 10 and the boom 20, a second hydraulic rod 21 is installed on the boom 20. The movable end of the second hydraulic rod 21 drives the docking seat 40 to rotate around its hinge point with the boom 20, so that the round shaft 31 is inserted into the hook groove 41 and the fitting part 42 is connected with the insertion part 32, thereby achieving a quick locking connection between the grab body 10 and the boom 20.

[0024] During docking, the operator manipulates the boom 20 of the engineering machinery to bring the docking seat 40 close to the adaptive connecting seat 30. During this process, the hook groove 41 of the docking seat 40 first aligns with and engages with the round shaft 31 on the adaptive connecting seat 30, forming initial positioning and suspension. Subsequently, the second hydraulic rod 21 extends and pushes the docking seat 40 to rotate around the hinge point. As the docking seat 40 rotates, the fitting part 42 gradually moves closer to the insertion part 32 and finally achieves complete insertion and engagement. At this time, the side plate 33 on the adaptive connecting seat 30 fits against the side of the docking seat 40, completing the first locking. The connecting hole 331 on the side plate 33 is exactly aligned with the sliding pin 43 in the fitting part 42. Immediately afterwards, the drive unit starts, driving the sliding pin 43 in the fitting part 42 to extend along its sliding axis and accurately insert into the connecting hole 331 of the side plate 33. The insertion of the sliding pin 43 restricts the relative displacement of the adaptive connecting seat 30 and the docking seat 40 in the insertion direction, thereby completing the second locking.

[0025] Thus, the circular shaft 31 bears the main gravity load, the joint 32 and the fitting part 42 cooperate to bear the shear and bending torque, and the sliding pin 43 provides anti-disengagement safety, realizing a quick and rigid locking connection between the grab body 10 and the engineering machinery boom 20.

[0026] Reference Figure 3 and Figure 4The insertion part 32 includes two parallel spaced first limiting plates 321 and an insertion seat 322 disposed between the two first limiting plates 321. The two first limiting plates 321 are fixed on the body of the adaptive connector 30, forming a receiving space between them. The insertion seat 322 is disposed in the receiving space. A limiting post 327 is fixedly installed on the insertion seat 322. The fitting part 42 is provided with a positioning hole 423 for the insertion of the limiting post 327 to restrict the relative rotation between the insertion seat 322 and the fitting part 42.

[0027] Specifically, the limiting post 327 includes a post body 3271, which is a cylindrical structure. An insert sleeve 3272 is fixedly installed inside the opening of the post body 3271. A metal rod 3273 is coaxially slidably installed inside the insert sleeve 3272. A wedge block 3274 is fixedly installed at one end of the metal rod 3273 that extends into the insert sleeve 3272. The insert sleeve 3272 has at least one mounting hole 301 radially. In this embodiment, the number of mounting holes 301 is preferably 6-8. A positioning pin 3275 is slidably installed in the hole 301. The inner end face of the positioning pin 3275 abuts against the inclined surface of the wedge block 3274. A first electromagnetic coil 424 is pre-embedded in the positioning hole 423. When the limiting post 327 is inserted into the positioning hole 423 and the first electromagnetic coil 424 is energized, the metal rod 3273 is driven to move axially by magnetic force, which drives the wedge block 3274 to push the positioning pin 3275 so that it extends radially and locks on the inner end face of the fitting part 42, forming a radial mechanical interlock.

[0028] Furthermore, a return spring 3276 is provided between the end of the metal rod 3273 away from the wedge block 3274 and the bottom of the insert sleeve 3272.

[0029] Reference Figure 1 and Figure 5 The driving component includes a second electromagnetic coil 425 pre-embedded in the docking seat 40 and a metal shaft 44 passing through the second electromagnetic coil 425. A limit sleeve 45 is also fixedly installed in the docking seat 40, and a sliding pin 43 is slidably installed in the limit sleeve 45. One end of the metal shaft 44 is hinged to the side wall of the sliding pin 43 through a connecting rod arm 46. When the second electromagnetic coil 425 is energized, the metal shaft 44 is driven to move by magnetic force, and the sliding pin 43 is driven into the connecting hole 331 by the connecting rod arm 46.

[0030] During the initial docking, the boom 20 of the construction machinery drives the docking seat 40 to rotate via the second hydraulic rod 21. The round shaft 31 enters the hook groove 41, the fitting part 42 is inserted into the insertion part 32, the limiting post 327 is inserted into the positioning hole 423, and the sliding pin 43 is aligned with the connecting hole 331.

[0031] The system energizes the first electromagnetic coil 424 inside the positioning hole 423. The first electromagnetic coil 424 attracts the metal rod 3273 to move axially, stretching the return spring 3276. The wedge block 3274 follows, transmitting radial force to the positioning pin 3275. The positioning pin 3275 extends outward and bites the inner wall of the positioning hole 423. At this time, the limiting post 327 is not only inserted into the positioning hole 423, but is also radially tightened to prevent the fitting part 42 from loosening under high impact conditions.

[0032] When power is off, the reset spring 3276 pulls the metal rod 3273 back to its original position, the wedge block 3274 retracts, and the positioning pin 3275 retracts under its own weight or a slight reverse force, releasing the tension and not affecting the next insertion or removal.

[0033] At the same time, the second electromagnetic coil 425 inside the docking seat 40 is energized, the metal shaft 44 is attracted, and the sliding pin 43 is driven by the connecting rod arm 46 to slide out from the fitting part 42 and insert into the connecting hole 331 of the side plate 33, thus completing the secondary locking.

[0034] When unlocking, first disconnect the second electromagnetic coil 425, and the sliding pin 43 will return to its original position with the metal shaft 44 or be manually assisted to exit the connecting hole 331. Then disconnect the first electromagnetic coil 424, and the positioning pin 3275 will retract. The second hydraulic rod 21 will push the docking seat 40 to reverse, the fitting part 42 will disengage, and the round shaft 31 will exit the hook groove 41, thus completing the separation. Example 2

[0035] Reference Figure 2 and Figure 3 Positioning seats 323 are fixedly installed on the opposite surfaces of the two first limiting plates 321. The plug-in seat 322 is elastically connected to the positioning seat 323 through a tension spring 324. The plug-in seat 322 has a through hydraulic channel inside. An oil inlet pipe 325 and an oil outlet pipe 326 connected to the hydraulic channel are fixed on its outer wall. The fitting part 42 is provided with an oil supply inlet pipe 325 and an oil outlet pipe 326 that pass through the first through hole 421 and the second through hole 422 of the plug-in part, respectively.

[0036] Furthermore, an O-ring 302 is fitted on the outer peripheral wall of the oil inlet pipe 325 and the oil outlet pipe 326. When the oil inlet pipe 325 and the oil outlet pipe 326 pass through the fitting part 42, the O-ring 302 forms a hydraulic seal by interference fit with the inner wall of the first through hole 421 and the second through hole 422.

[0037] In the initial stage of docking, when the fitting part 42 moves towards the insertion part 32, the openings of the oil inlet pipe 325 and the oil outlet pipe 326 first contact the surface of the fitting part 42. Since the insertion seat 322 is suspended between the two first limiting plates 321 by the tension spring 324, this elastic suspension structure allows the insertion seat 322 to undergo slight displacement and deflection when impacted. This micro-motion characteristic plays a buffering role, avoiding bending or cracking caused by direct collision of hard pipes. At the same time, the restoring force of the tension spring 324 is used to automatically correct the posture of the insertion seat 322, making it easier for the oil pipe opening to align with the first through hole 421 and the second through hole 422 on the fitting part 42.

[0038] As the second hydraulic rod 21 continues to drive the docking seat 40 to rotate, the oil inlet pipe 325 and the oil outlet pipe 326 are forcibly inserted into the first through hole 421 and the second through hole 422. At this time, the O-ring seal 302 sleeved on the oil pipe begins to deform. Before the complete docking, the O-ring seal 302 is always in a compressed and stored state. When the fitting part 42 and the insertion part 32 are completely fitted, the oil inlet pipe 325 and the oil outlet pipe 326 have completely passed through the fitting part 42. At this time, the O-ring seal 302 forms an interference fit between the outer wall of the oil pipe and the inner wall of the first through hole 421 and the second through hole 422. This interference ensures that there is sufficient radial clamping force between the contact surfaces, so that when the high-pressure oil flows through, it can effectively block the path of oil leakage along the pipe wall and form a reliable static hydraulic seal.

[0039] After the seal is established, the main hydraulic oil source from the boom 20 of the construction machinery enters the fitting part 42 through the external pipeline, and then flows into the oil inlet pipe 325 through the first through hole 421, enters the hydraulic channel inside the plug seat 322, and then flows out through the oil outlet pipe 326 and the second through hole 422, and is finally delivered to the actuator inside the grab body 10. Example 3

[0040] Reference Figure 6 The grab body 10 includes a central column 11, with at least two first mounting brackets 12 and second mounting brackets 13 installed at both ends of the central column 11. In this embodiment, the first mounting brackets 12 and second mounting brackets 13 are preferably made by casting or thick plate welding process to ensure structural stability under high-intensity impact load. The number of first mounting brackets 12 and second mounting brackets 13 is preferably 4-5. A jaw plate 14 is hinged in the first mounting bracket 12, and a first hydraulic rod 15 is hinged in the second mounting bracket 13. The movable end of the second mounting bracket 13 is hinged to the jaw plate 14 to drive the jaw plate 14 to open and close. A main oil passage 111 is opened in the central column 11, and the main oil passage 111 is connected to the first hydraulic rod 15 through a hose 16.

[0041] After the grab body 10 is docked with the boom 20 of the construction machinery through the adaptive connecting seat 30, the high-pressure hydraulic oil from the construction machinery pump station passes through the internal pipeline of the boom 20, the first through hole 421 of the fitting part 42, the oil inlet pipe 325 of the plug part 32, and finally flows into the main oil passage 111 in the center column 11. After the high-pressure oil is temporarily stored and stabilized in the main oil passage 111 of the center column 11, it is distributed to each high-pressure hose 16. The oil flows through the hose 16 to each first hydraulic rod 15.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A steel grabber for scrap metal recycling, comprising a grab bucket body (10) and an engineering machinery boom (20), characterized in that, An adaptive connecting seat (30) is fixedly installed on the grab body (10). A docking seat (40) is hinged to the end of the engineering machinery boom (20). The docking seat (40) has a hook groove (41) with an opening facing the engineering machinery boom (20) and an fitting part (42) arranged outward from the bottom of the hook groove (41). A round shaft (31) adapted to the hook groove (41) and a plug-in part (32) that is plugged into the fitting part (42) are correspondingly provided on the adaptive connecting seat (30). A symmetrically arranged side plate (33) is also fixedly installed on the adaptive connecting seat (30). A connecting hole (331) is opened on the side plate (33). A sliding pin (43) is slidably installed in the fitting part (42). When the fitting part (42) and the plug-in part (32) are docked, the sliding pin (43) extends into the connecting hole (331) under the drive of the driving component to achieve secondary locking. The boom (20) of the engineering machinery is equipped with a second hydraulic rod (21). The movable end of the second hydraulic rod (21) drives the docking seat (40) to rotate around its hinge point with the boom (20), so that the round shaft (31) is inserted into the hook groove (41) and the fitting part (42) is connected with the plug part (32), thereby realizing the quick locking connection between the grab body (10) and the boom (20).

2. The steel grabber for scrap metal recycling according to claim 1, characterized in that: The plug-in part (32) includes two parallel spaced first limiting plates (321) and a plug-in seat (322) disposed between the two first limiting plates (321). A limiting post (327) is fixedly installed on the plug-in seat (322), and a positioning hole (423) is correspondingly opened on the fitting part (42) for the limiting post (327) to be inserted.

3. A steel grabber for scrap metal recycling according to claim 2, characterized in that: The limiting post (327) includes a post body (3271), an insert sleeve (3272) is fixedly installed in the opening of the post body (3271), a metal rod (3273) is slidably installed coaxially in the insert sleeve (3272), a wedge block (3274) is fixedly installed at one end of the metal rod (3273) that extends into the insert sleeve (3272), the insert sleeve (3272) has at least one mounting hole (301) in the radial direction, a positioning pin (3275) is slidably installed in the mounting hole (301), and the inner end face of the positioning pin (3275) abuts against the inclined surface of the wedge block (3274); The positioning hole (423) is pre-embedded with a first electromagnetic coil (424). When the limiting post (327) is inserted into the positioning hole (423) and the first electromagnetic coil (424) is energized, the metal rod (3273) is driven to move axially by magnetic force, which drives the wedge block (3274) to push the positioning pin (3275) so that it extends radially and is locked on the inner end face of the fitting part (42).

4. A steel grabber for scrap metal recycling according to claim 3, characterized in that: A return spring (3276) is provided between the end of the metal rod (3273) away from the wedge block (3274) and the bottom of the insert sleeve (3272).

5. A steel grabber for scrap metal recycling according to claim 2, characterized in that: The driving component includes a second electromagnetic coil (425) pre-embedded in the docking seat (40) and a metal shaft (44) passing through the second electromagnetic coil (425). A limiting sleeve (45) is also fixedly installed in the docking seat (40), and the sliding pin (43) is slidably installed in the limiting sleeve (45). One end of the metal shaft (44) is hinged to the side wall of the sliding pin (43) via a connecting rod arm (46). When the second electromagnetic coil (425) is energized, the metal shaft (44) is driven to move by magnetic force, and the sliding pin (43) is driven to extend into the connecting hole (331) via the connecting rod arm (46).

6. A steel grabber for scrap metal recycling according to claim 2, characterized in that: Positioning seats (323) are fixedly installed on the opposite surfaces of the two first limiting plates (321), and the plug-in seat (322) is elastically connected to the positioning seat (323) through a tension spring (324); The plug-in socket (322) has a through hydraulic channel inside, and an oil inlet pipe (325) and an oil outlet pipe (326) connected to the hydraulic channel are fixed on its outer wall. The fitting part (42) is provided with an oil supply inlet pipe (325) and an oil outlet pipe (326) that pass through the first through hole (421) and the second through hole (422) of the plug-in.

7. A steel grabber for scrap metal recycling according to claim 6, characterized in that: O-rings (302) are fitted on the outer peripheral walls of the oil inlet pipe (325) and the oil outlet pipe (326). When the oil inlet pipe (325) and the oil outlet pipe (326) pass through the fitting part (42), the O-rings (302) are press-fitted with the inner walls of the first through hole (421) and the second through hole (422) to form a hydraulic seal.

8. A steel grabber for scrap metal recycling according to claim 1, characterized in that: The grab body (10) includes a central column (11), at least two first brackets (12) and second brackets (13) are respectively installed at both ends of the central column (11). A jaw plate (14) is hinged in the first bracket (12), and a first hydraulic rod (15) is hinged in the second bracket (13). The movable end of the second bracket (13) is hinged to the jaw plate (14) to drive the jaw plate (14) to open and close. The central column (11) has a main oil passage (111) inside, and the main oil passage (111) is connected to the first hydraulic rod (15) through a hose (16).

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