Electric hydraulic double-jaw underwater grab bucket

Abstract

The utility model discloses an electric hydraulic double-jaw underwater grab bucket which comprises a hanging bracket, an upper bearing beam connected below the hanging bracket, a double-jaw bucket body connected below the upper bearing beam and a hydraulic power device for driving the double-jaw bucket body to be opened and closed, the upper bearing beam is of a box body structure and comprises a box body and outer side plates welded to the two longitudinal sides of the box body, and the upper bearing beam is of a box body structure. A gap is formed between the box body and the outer side plate to form an interlayer, the hydraulic power device comprises two oil cylinders horizontally arranged in the interlayer, the bivalve bucket body comprises bucket bodies hinged to the two ends of the bottom of the interlayer, the two ends of each oil cylinder are hinged to the top ends of bucket side plates of the bucket bodies respectively, and the two ends of each oil cylinder are hinged to the top ends of the bucket side plates of the bucket bodies respectively. The interlayer is further provided with a handrail which is located below a piston rod of the oil cylinder and extends in the length direction of the piston rod. The utility model has the advantages that the antirust coating of the piston rod of the oil cylinder is not damaged, the box body of the deck beam is high in structural strength and good in sealing performance, the bucket lip plate of the bucket body is not easy to wear, the bucket teeth are not easy to break, and the maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of electro-hydraulic grab technology, and in particular relates to an electro-hydraulic double-jaw underwater grab. Background Technology

[0002] Underwater grab buckets are specialized lifting devices used to dredge various materials from the seabed, such as silt, sand, gravel, and boulders. Among underwater grab buckets, the electro-hydraulic double-lobed grab bucket is the most common. Previously, double-lobed underwater grab buckets typically had a capacity of 20 cubic meters. 3 The grab buckets below generally have small capacities and are inefficient in offshore operations.

[0003] As a result, a large-capacity double-lobed underwater grab bucket was later developed, with a grab bucket capacity reaching nearly 60m³. 3 The increased capacity necessitates a massive grab bucket. This large size increases the risk of tipping upon entry into the water. To prevent tipping, the grab bucket's center of gravity needs to be lowered, rendering the traditional vertical hydraulic cylinders unsuitable. Therefore, in existing technology, for large-capacity double-lobed underwater grab buckets, hydraulic cylinders are horizontally positioned on either side of the upper support beam to drive the two lobes. This reduces the height of the upper support beam and ultimately lowers the overall center of gravity of the grab bucket, making it less prone to tipping upon entry.

[0004] However, setting the hydraulic cylinder horizontally presents two problems. One is that the piston rod of the hydraulic cylinder is easily damaged by the materials inside the bucket, especially large, hard stones, which can damage the anti-rust coating on the surface of the piston rod and cause the hydraulic cylinder to leak. The other is that the extension and retraction stroke of the hydraulic cylinder is relatively long. During the extension and retraction process, the piston rod will inevitably deflect, causing the bucket to jam when driving it and making it impossible to drive the bucket into position. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to provide an electro-hydraulic double-jaw underwater grab that does not damage the anti-rust coating of the cylinder piston rod during operation, so as to overcome the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An electro-hydraulic double-jaw clasp underwater grab includes a frame, an upper support beam connected below the frame, a double-jaw clasp body connected below the upper support beam, and a hydraulic power device for driving the double-jaw clasp body to open and close. The upper support beam is a box structure, including a box body and outer side plates welded to the longitudinal sides of the box body. There is a gap between the box body and the outer side plates to form a sandwich. The hydraulic power device includes two cylinders horizontally arranged in the sandwich. The double-jaw clasp body includes a clasp body hinged to both ends of the bottom of the sandwich. The two ends of the cylinders are respectively hinged to the top of the clasp side plates of the clasp body. The sandwich is characterized in that a railing is provided below the piston rod of the cylinder and extends along the length of the piston rod.

[0008] By adopting the above technical solution, since a railing is provided in the interlayer below the piston rod of the oil cylinder, the railing can prevent large hard stones inside the bucket from damaging the surface of the piston rod when the double-lobed bucket closes, thus avoiding damage to the anti-rust coating on the surface of the oil cylinder piston rod.

[0009] In this invention, the top of the bucket side plate has a first connecting shaft, and both ends of the hydraulic cylinder are hinged to the first connecting shaft on the same side of the two buckets via spherical bearings. With this structure, even if the hydraulic cylinder deflects during extension and retraction, the inner and outer rings of the spherical bearings can deflect accordingly, preventing jamming and ensuring that the hydraulic cylinder can fully extend and retract, thereby enabling the buckets to be driven into position.

[0010] In this utility model, the box body is composed of inner side plates on both longitudinal sides, and a front end plate, a rear end plate, and a bottom plate welded between the inner side plates on both sides, and the railing is welded to the inner side plates.

[0011] In this invention, the front end plate, the rear end plate, and the bottom plate are formed by bending a single piece of steel plate. The bottom plate is symmetrically bent into two inclined plates from the middle, creating a conical structure at the bottom of the housing that is lower in the middle and higher at both ends. This structure, where the front end plate, rear end plate, and bottom plate are formed from a single piece of steel plate, reduces the number of weld seams between the bottom plate and the front and rear end plates, thus reducing weld leakage points. The symmetrical bending of the bottom plate into two inclined plates from the middle creates a conical structure at the bottom of the housing, which extends the weld seams between the bottom plate and the inner side plates, improving the weld strength between the bottom plate and the inner side plates. Furthermore, the conical structure at the bottom, lower in the middle and higher at both ends, allows the bottom plate to distribute some of the weight horizontally when bearing pressure from the internal hydraulic oil, preventing the hydraulic oil from acting entirely vertically on the bottom plate and improving its load-bearing capacity.

[0012] In this invention, the top of the container has an inlet / outlet and a top sealing plate sealing the inlet / outlet. An upwardly extending lifting lug is welded to the middle of the inner side plate, and the two ends of the lower longitudinal beam of the hanger are connected to the two lifting lugs by pins. With this structure, when the grab bucket is in operation, the upper support beam is suspended by the lifting lugs, and the load-bearing capacity of the grab bucket is vertically transmitted through the inner side plates on both sides. This prevents horizontal pulling on the welds between the inner side plates and the front, rear, and bottom plates, reducing the risk of weld tearing. Furthermore, the suspension force does not act on the top sealing plate, thus not affecting the sealing performance between the top sealing plate and the inlet / outlet, ensuring the sealing performance of the container during underwater operations.

[0013] In this utility model, the bucket body includes a bucket bottom plate, bucket side plates symmetrically welded to both sides of the bucket bottom plate, and a bucket lip plate. The bucket lip plate includes a bottom welded to the front end of the bucket bottom plate and a side welded to the front end of the bucket side plates. A row of forward-protruding bucket teeth is welded to the lower surface of the bottom of the bucket lip plate. The bucket lip plate is integrally formed by hot-pressing and bending a thick steel plate with a thickness greater than that of the bucket bottom plate and the bucket side plates. The inner wall of the bucket lip plate is flush with the inner walls of the bucket bottom plate and the bucket side plates. The outer wall of the bucket lip plate is higher than the outer walls of the bucket bottom plate and the bucket side plates. Both the inner and outer surfaces of the bucket lip plate are overlaid with weld. The lip plate is formed by hot pressing and bending a thick steel plate that is thicker than the bottom plate and side plate of the bucket, which improves the overall strength of the lip plate and ensures that the grab bucket will not deform even under heavy load and impact during operation. In addition, the inner and outer surfaces of the lip plate are reinforced with weld overlays, which improves the wear resistance of the lip plate and makes it less prone to wear.

[0014] In this invention, the bucket tooth comprises a tooth base welded to the lower surface of the bottom of the bucket lip plate and a tooth tip inserted into the front end face of the tooth base and protruding forward. The bucket tooth adopts a split structure, consisting of a tooth base and a tooth tip. In case of tooth tip wear or breakage, only the tooth tip needs to be removed from the tooth base for replacement, reducing maintenance difficulty and maintenance costs.

[0015] In this invention, the outer front edge of the bucket lip plate is an upwardly inclined chamfered surface. The tooth holder is divided into a welding part and a support part with a thickness significantly greater than the welding part. The welding part is welded to the lower surface of the bottom. The support part has an upper inclined surface welded to the chamfered surface and a lower inclined surface opposite to the upper inclined surface. Because the welding mating surface between the upper inclined surface of the support part and the chamfered surface of the bucket lip plate is inclined, when the bucket tooth is subjected to impact force, the chamfered surface of the bucket lip plate will provide support to the tooth holder in the opposite direction, further improving the support strength of the tooth holder. The tooth holder is less likely to fall off the bucket lip plate when subjected to strong impact.

[0016] In this invention, the outer wall of the bucket bottom plate is further welded with reinforcing ribs corresponding to each tooth seat, supporting the tooth seat from the rear. Each reinforcing rib has a front end welded to the rear end face and lower surface of the tooth seat and extending to the front end welded to the lower inclined surface. The rear end of the reinforcing rib extends to the rear end of the bucket bottom plate. These reinforcing ribs further provide rearward support strength to the tooth seats and improve the welding strength between the tooth seats and the bucket lip plate, thus simultaneously increasing the strength of both the bucket bottom plate and the bucket lip plate.

[0017] By adopting the above technical solution, the electric hydraulic double-jaw underwater grab bucket of this utility model has a series of advantages, such as the rust-proof coating of the cylinder piston rod is not damaged, the box structure of the upper support beam has high strength and good sealing performance, the bucket lip plate of the bucket body is not easy to wear, and the bucket teeth are not easy to break and are easy to maintain. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 1A A three-dimensional structural diagram of this utility model with one outer side plate removed;

[0020] Figure 1B A schematic diagram of the double-lobed bucket in its open state;

[0021] Figure 1C This is a schematic diagram of the closed state of the double-lobed bucket body of this utility model;

[0022] Figure 1D for Figure 1C Sectional view along line AA;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the hanger;

[0024] Figure 3 This is a three-dimensional structural diagram of the upper supporting beam;

[0025] Figure 4 This is a sectional three-dimensional view of the upper bearing beam;

[0026] Figure 5 A structural diagram showing how a single board is bent to create a bottom plate, a front plate, and a rear plate.

[0027] Figure 6 A structural diagram of the fighting body from a first-person perspective;

[0028] Figure 7 A structural diagram of the fighting body from a second perspective;

[0029] Figure 8 This is a frontal view of a beak tooth;

[0030] Figure 9 This is a diagram showing the top view of a beak tooth. Detailed Implementation

[0031] like Figure 1 As shown, the electric hydraulic double-jaw underwater grab of this utility model includes a gantry 100, an upper support beam 200 connected below the gantry 100, a double-jaw bucket body 300 connected below the upper support beam 200, and a hydraulic power device 400 for driving the double-jaw bucket body 300 to open and close.

[0032] Combination Figure 2 As shown, the hanger 100 has a symmetrical structure and is connected above the middle position of the upper beam 200. It includes an upper longitudinal beam 101 and a lower longitudinal beam 102 arranged in the same vertical plane, a connecting part 103 connecting the upper longitudinal beam 101 and the lower longitudinal beam 102 from the middle position, and wedge sleeve assemblies 104 symmetrically connected to both ends of the upper longitudinal beam 101.

[0033] Specifically, the upper end of the connecting part 103 is hinged to the downward protrusion 101a at the middle position of the upper longitudinal beam 101 via a transverse pin 100a, and the lower end is hinged to the upward protrusion 102b at the middle position of the lower longitudinal beam 102 via a longitudinal pin 100b. With this structure, the upper longitudinal beam 101 and the lower longitudinal beam 102 can swing back and forth and left and right relative to each other.

[0034] Each wedge sleeve assembly 104 consists of a T-shaped connector 104a and two wedge sleeves 104b. The lower end of the middle vertical portion of the T-shaped connector 104a is hinged to the ends of both ends of the upper longitudinal beam 101 via a transverse pin 100a. The two wedge sleeves 104b are symmetrically hinged to the ends of the horizontal transverse portion of the T-shaped connector 104a via transverse pins 100a.

[0035] like Figure 3 As shown, the upper support beam 200 is a box structure, which is welded from 22mm steel plates and includes a box body 210 and outer side plates 222 welded to the longitudinal sides of the box body 210.

[0036] The housing 210 has a length of 6692 mm, a width of 3942 mm, and a height of 3524 mm. It is composed of inner side plates 211 on both longitudinal sides, and a front end plate 212, a rear end plate 213, and a bottom plate 214 welded between the inner side plates 211. The top of the housing 210 also has an inlet / outlet 215 and a top sealing plate 216 sealed over the inlet / outlet 215. The interior of the housing 210 is divided by a partition into an oil chamber 231 in the lower part and a mechanical chamber 232 in the upper part. The oil chamber 231 is used to store hydraulic oil, and the mechanical chamber 232 is used to house the hydraulic pump and the motor that drives the hydraulic pump.

[0037] Combination Figure 4 and Figure 5As shown, in this utility model, the front end plate 212, the rear end plate 213, and the bottom plate 214 are formed by bending a single piece of steel plate. The bottom plate 214 is symmetrically bent into two inclined plates 214a from the middle so that the bottom of the box 210 forms a conical structure with a low middle and high ends. The oil cavity 231 is also provided with a C-shaped intermediate reinforcing plate 233, which is welded to the inner wall of the bottom middle bend 214b and the inner walls of the two inner side plates 211.

[0038] Since the front plate 212, rear plate 213, and bottom plate 214 are formed by bending a single piece of steel plate, the number of welds between the bottom plate 214 and the front plate 212 and rear plate 213 is reduced, thus reducing the number of oil leakage points. Furthermore, the bottom plate 214 is symmetrically bent into two inclined plates 214a from the middle, so that the bottom of the box body 210 forms a conical structure with a lower middle and higher ends. This extends the weld between the bottom plate 214 and the inner side plates 211 on both sides, improving the weld strength between the bottom plate 214 and the inner side plates 211. In addition, it also allows the bottom plate 214 to distribute some of the weight in the horizontal direction when bearing pressure on the internal hydraulic oil, preventing the hydraulic oil from acting entirely on the bottom plate 214 in the vertical direction, thereby improving the load-bearing capacity of the bottom plate 214. Moreover, the added C-shaped intermediate reinforcing plate 233 further improves the strength of the bottom of the box body, making the bottom of the upper support beam less prone to deformation and the weld less prone to breakage, thereby preventing oil leakage.

[0039] In the oil cavity 231, inner corner reinforcing plates 234 are welded to the end bends 214c of the base plate 214 and the front end plate 212, and the end bends 214c of the base plate 214 and the rear end plate 213. This can improve the strength of the two end bends of the base plate.

[0040] The inner walls of the two inclined plates 214a are welded with first reinforcing ribs 241 that extend laterally from the inner corner reinforcing plate 234 to the middle reinforcing plate 233, and the inner walls of the oil cavity 231 are welded with second reinforcing ribs 242 that extend vertically.

[0041] In addition, vertically extending third reinforcing ribs 243 are welded to the inner walls of the mechanical compartment 232.

[0042] In this embodiment, both the inner side plate 211 and the outer side plate 220 extend downward beyond the bottom plate 214, and both ends of the inner side plate 211 and the outer side plate 220 extend outward beyond the front end plate 212 and the rear end plate 213. C-shaped outer corner reinforcing plates 235, welded to the bottom end bends 214c of the box body 210 and to both inner side plates 211, are also provided on the outer sides of these bends. This further enhances the strength of the bottom of the box body 210 from both ends.

[0043] In addition to increasing the strength of the housing 210, the aforementioned reinforcing plates and ribs also increase the heat dissipation area, which is beneficial for cooling the hydraulic oil in the oil chamber 231 during grab bucket operation.

[0044] In this embodiment, an upwardly extending lifting lug 211a is welded to the middle position of the inner side plate 211. The lifting lug 211a is connected to both ends of the lower longitudinal beam 102 of the hanger 100 by a transverse pin 100a, so that the upper support beam 200 is suspended below the hanger 100. The load of the grab bucket is transmitted vertically through the inner side plates 211 on both sides, which will not pull the welds of the inner side plate 211 with the front plate 212, the rear plate 213 and the bottom plate 214 in the horizontal direction, and is less likely to cause the welds to tear. The tension of the hanger 100 will not act on the top sealing plate 216, so as to avoid affecting the sealing effect of the top sealing plate 216 on the entrance 215.

[0045] In this embodiment, reinforcing wing plates 211b are welded to both sides of the lifting lug 211a and the upper edge of the inner side plate 211, which further improves the load-bearing strength of the lifting lug 211a.

[0046] In this embodiment, flange plates 251 are provided at the edges of the inlet / outlet 215 and at the boundary between the oil distribution chamber 231 and the mechanical chamber 232. Sealing rings are provided between the top sealing plate 216 and the flange plates 251, and between the partition plate and the flange plates 215, and are fastened by a ring of bolts 252. This structure ensures the airtightness of the housing 210, making the upper support beam suitable for underwater operations.

[0047] The hydraulic power unit 400 includes an oil pump, a motor, a directional valve, and two cylinders 410. The oil pump, motor, and directional valve are all installed within the mechanical cavity 232. The motor is connected to the oil pump to drive its operation. The oil pump's suction port is connected to the oil outlet of the oil cavity 231. The oil pump's outlet and the oil cavity 231's inlet are connected to the rod-side and rodless-side chambers of the cylinders 410 via the directional valve. The cylinders 410, under the directional adjustment of the directional valve, drive the opening and closing of the double-lobed bucket 300.

[0048] A sandwich 202 is formed between the inner side panel and the outer side panel 220 of the housing 210. The lower ends of both ends of the sandwich 202 have swivel holes 202a.

[0049] like Figure 6 and Figure 7 As shown, the hopper 310 has a structure resembling a winnowing basket, with a length of 4790mm, a width of 3480mm, and a height of 4374mm. The capacity of a single hopper is 28m³. 3 mm (the total capacity of the grab bucket is 56m) 3The bucket is constructed entirely of steel plates through forming and welding, and includes a bottom plate 311, side plates 312 symmetrically welded to both sides of the bottom plate 311, and a lip plate 313. Both the bottom plate 311 and the side plates 312 are welded from steel plates. The bottom plate 311 has a thickness of 15-20 mm, and the side plates 312 have a thickness of 50-60 mm. The lip plate 313 is made of 150-200 mm thick steel plate through hot pressing, forming a bottom portion 313a welded to the front end of the bottom plate and side portions 313b welded to the front ends of the side plates 312. The width of the lip plate 313 along the material inlet / outlet direction is 452-844 mm.

[0050] In this embodiment, the thickness of the bottom plate 311 is 20mm, the thickness of the side plate 312 is 60mm, and the thickness of the lip plate 313 is 180mm. Since the lip plate 313 has an arc-shaped rim, meaning its width along the material inlet / outlet direction is wider in the middle and gradually narrows towards both sides, its widest point is 844mm and its narrowest point is 452mm.

[0051] The connection between the bottom plate 311 and the side plate 312, as well as the connection between the bottom 313a and the side 313b of the lip plate 313, are all smooth transitions. These smooth transitions allow the grab bucket to more easily slide out of the bucket body when dumping materials, especially viscous materials such as sludge, preventing them from easily remaining inside the bucket.

[0052] A row of forward-protruding bucket teeth 320 are welded to the lower surface of the bottom of the bucket lip plate 313.

[0053] The inner wall of the bucket lip plate 313 is flush with the inner walls of the bucket bottom plate 311 and the bucket side plate 312. The outer wall of the bucket lip plate 313 is higher than the outer walls of the bucket bottom plate 311 and the bucket side plate 312. Both the inner and outer surfaces of the bucket lip plate 313 have weld overlay 314.

[0054] In this utility model, the bucket lip plate 313 is formed by integral hot pressing and bending of a thick steel plate that is thicker than both the bucket bottom plate 311 and the bucket side plate 312, which improves the overall strength of the bucket lip plate 313 and ensures that the grab bucket will not deform even under heavy load and impact during operation. Furthermore, weld overlay 314 is provided on both the inner and outer surfaces of the bucket lip plate 313, which improves the wear resistance of the bucket lip plate and makes the bucket lip less prone to wear.

[0055] Both ends of the bucket lip plate 313 extend upward to the top of the bucket side plate 312. The top of the bucket side plate 312 also has a connecting head 312a that extends forward and is welded to the upper edge of the end of the bucket lip plate 313. The addition of the connecting head 312a to the top of the bucket side plate 313 further enhances the strength of the bucket lip plate 313 by welding the rear edge of the bucket lip plate 313 and the edges of the two ends of the bucket to the bucket bottom plate 311 and the bucket side plate 312.

[0056] The bucket tooth 320 comprises a tooth base 321 welded to the lower surface of the bottom 313a of the bucket lip plate 313 and a tooth tip 322 inserted into the front end face of the tooth base 321 and protruding forward. The bucket tooth 320 adopts a split structure, consisting of two parts: the tooth base 321 and the tooth tip 322. In the event of wear or breakage of the tooth tip 321, the tooth tip 322 can be simply removed from the tooth base 321 for replacement, reducing maintenance difficulty and cost.

[0057] In this embodiment, the outer front edge of the lip plate 313 is an upwardly inclined chamfered surface 313c. The tooth holder 321 is divided into a welding part 321a and a support part 321b with a thickness significantly greater than that of the welding part 321a. The welding part 321a is directly welded to the lower surface of the bottom 313a. The support part 321b has an upper inclined surface 321c welded to the chamfered surface 313c and a lower inclined surface 321d opposite to the upper inclined surface 321c. With this structure, since the welding mating surface between the upper inclined surface 321c of the support part 321b and the chamfered surface 313c of the lip plate 313 is inclined, when the bucket tooth 320 is subjected to impact force, the chamfered surface 313c of the lip plate 313 will provide support to the tooth holder 321 in the opposite direction, further improving the support strength of the tooth holder 321. The tooth holder 321 is not easy to fall off the lip plate 313 when subjected to strong impact.

[0058] Combination Figure 8 and Figure 9 As shown, in this embodiment, the rear end face of the tooth tip 322 has a socket, and the front end face of the support portion 321b has a plug for inserting into the socket. The tooth tip 322 has a pin hole 322a around its circumference, and a pin 322b is inserted into the pin hole 322a to fix the plug in the socket (the plug also has a pin hole). The pin 322b is welded to the pin hole 322a. With this structure, the tooth base 321 provides high support strength for the tooth tip 322, and it is easy to disassemble when the tooth tip 322 needs to be replaced. Simply break the weld between the pin 322b and the pin hole 322a, pull the pin 322b out of the pin hole 322a, and remove the tooth tip 322 from the tooth base 321.

[0059] In addition, a reinforcing rib 324 supporting the tooth seat 321 from the rear is welded to the outer wall of the bucket bottom plate 311 corresponding to each tooth seat 321. This reinforcing rib 324 has a front end 324a welded to the rear end face and lower surface of the tooth seat 321 and extending to the lower inclined surface 321d. The rear end 324b of the reinforcing rib 324 extends to the rear end of the bucket bottom plate 311. With this structure, the reinforcing rib 324 further provides rearward support strength to the tooth seat 321 and improves the welding strength between the tooth seat 321 and the bucket lip plate 313, thus simultaneously increasing the strength of both the bucket bottom plate 311 and the bucket lip plate 313.

[0060] Furthermore, the lower surface of the welded part 321a has an upward-through rectangular hole 321e. Thus, the four edges of the upper surface of the tooth holder 321 and the upper edge of the hole 321e are welded to the bucket lip plate 313. By adopting this structure, the tooth holder 321 is welded to the bucket lip plate through two weld seams, one inner and one outer, further improving the welding strength between the tooth holder 321 and the bucket lip plate 313, and further ensuring that the bucket tooth 320 will not fall off under strong impact.

[0061] The top of the bucket side plate 312 has a first shaft hole 312a and a second shaft hole 312b located obliquely below the inner side of the first shaft hole 312a.

[0062] Combination Figures 1A-1D As shown, a rotating support shaft 203 is provided in the rotating shaft hole 202a of the interlayer 202. The top ends of the two bucket side plates 312 of the bucket body 310 extend into the interlayer 202, wherein the second shaft hole 312b is fitted on the rotating support shaft 203, so that the bucket body can swing around the rotating support shaft 203.

[0063] Two hydraulic cylinders 410 are horizontally arranged in two compartments 202. Each hydraulic cylinder 410 includes a cylinder body 410a and a piston rod 410b that extends and retracts within the cylinder body 410a. A first connecting shaft 312c is fixed in the first shaft hole 312a at the top of the bucket side plate 312. The rear end of the cylinder body 410a of the hydraulic cylinder 410 is hinged to the first connecting shaft 312c on the same side of one bucket body via a spherical bearing 410c, and the front end of the piston rod 410b of the hydraulic cylinder 410 is hinged to the first connecting shaft 312c on the same side of the other bucket body via a spherical bearing 410c. The spherical bearing consists of an outer ring and an inner ring that spherically fit together; the inner ring is fixed to the first connecting shaft 312c, and the outer ring is fixed to the cylinder body end or the piston rod end of the hydraulic cylinder. The inner and outer rings of the spherical plain bearing 410c are allowed to deflect at a certain angle when they rotate relative to each other. Therefore, even if the piston rod of the hydraulic cylinder deflects during the extension and retraction process, the inner and outer rings of the spherical plain bearing can also deflect accordingly to avoid jamming, thereby ensuring that the hydraulic cylinder can fully extend and retract to its full position, and thus enabling the bucket to be driven into position.

[0064] To prevent large stones or other hard objects inside the bucket from damaging the anti-rust coating on the piston rod 410b, a railing 204 welded to the inner side plate is installed inside the interlayer 202 below the piston rod 410b. This railing 204 can prevent large stones or other hard objects inside the bucket from damaging the anti-rust coating on the piston rod 410b, thus preventing corrosion of the piston rod and oil leakage from the cylinder 410.

[0065] A third shaft hole 312d is also provided obliquely below the inner side of the second shaft hole 312b of one of the buckets. The second connecting shaft 312e is fixed in the third shaft hole 312d. In order to ensure that the opening and closing of the two buckets are synchronized, in this embodiment, a synchronizing rod 205 is also symmetrically provided in each of the two layers. One end of the synchronizing rod 205 is hinged to the first connecting shaft 312c on the same side of one bucket, and the other end is hinged to the second connecting shaft 312e on the same side of the other bucket. By adding the synchronizing rod, the hydraulic cylinder 410 can ensure that the two buckets open and close synchronously when driving the two buckets.

[0066] As can be seen from the above detailed description, the electric hydraulic double-jaw underwater grab bucket of this utility model has a series of advantages, such as the rust-proof coating of the cylinder piston rod not being damaged, the box structure of the upper support beam having high strength and good sealing performance, the bucket lip plate of the bucket body not being easily worn, and the bucket teeth not being easily broken and easy to maintain.

Claims

1. An underwater electric hydraulic double-poppet clamshell grab, comprising a hanger, an upper support beam connected below the hanger, a double-poppet bucket body connected below the upper support beam, and a hydraulic power device for driving the double-poppet bucket body to open and close, wherein the upper support beam is a box structure comprising a box body and outer side plates welded on both longitudinal sides of the box body, a gap is formed between the box body and the outer side plates to form a sandwich layer, the hydraulic power device comprises two oil cylinders arranged horizontally in the sandwich layer, the double-poppet bucket body comprises a bucket body hinged at both ends of the bottom of the sandwich layer, and the two ends of the oil cylinder are respectively hinged to the top end of the bucket side plate of the bucket body, characterized in that, The interlayer is also provided with a guardrail below the piston rod of the oil cylinder and extending along the length direction of the piston rod.

2. The electro-hydraulic dual-poppet underwater grab according to claim 1, characterized in that, The top end of the bucket side plate has a first connecting shaft, and the two ends of the oil cylinder are respectively hinged to the first connecting shafts on the same side of the two bucket bodies through joint bearings.

3. The electro-hydraulic dual-poppet underwater grab according to claim 1, characterized in that, The box body is composed of inner side plates on the longitudinal two sides, and a front end plate, a rear end plate and a bottom plate welded between the two inner side plates, and the guardrail is welded on the inner side plates.

4. The electro-hydraulic dual-poppet underwater grab according to claim 3, characterized in that, The front end plate, the rear end plate and the bottom plate are bent from a whole steel plate, and the bottom plate is symmetrically bent from the middle to form two inclined plates to form a conical structure with the bottom of the box body being low in the middle and high at both ends.

5. The electro-hydraulic dual-poppet underwater grab according to claim 3, characterized in that, The top of the box body has an access and a top sealing plate sealed on the access.

6. The electro-hydraulic dual-poppet underwater grab according to claim 3, characterized in that, The middle position of the inner side plate is welded with an upward extending lifting lug, and the lower longitudinal beams of the lifting frame are connected on the two lifting lugs through pin shafts.

7. The electro-hydraulic dual-poppet underwater grab according to claim 1, characterized in that, The bucket body includes a bucket bottom plate, bucket side plates symmetrically welded on the two sides of the bucket bottom plate, and a bucket lip plate, the bucket lip plate includes a bottom part welded on the front end of the bucket bottom plate and side parts welded on the front end of the bucket side plates respectively, the lower surface of the bottom part of the bucket lip plate is welded with a row of bucket teeth protruding forward, the bucket lip plate is integrally hot-pressed and bent to form the bottom part and the side parts through a thick steel plate thicker than the bucket bottom plate and the bucket side plates, the inner wall of the bucket lip plate is flush with the inner walls of the bucket bottom plate and the bucket side plates, the outer wall of the bucket lip plate is higher than the outer walls of the bucket bottom plate and the bucket side plates, and the inner wall surface and the outer wall surface of the bucket lip plate are both provided with surfacing.

8. The electro-hydraulic dual-poppet underwater grab according to claim 7, characterized in that, The bucket teeth are composed of a tooth seat welded on the lower surface of the bottom part of the bucket lip plate and a tooth tip inserted on the front end surface of the tooth seat and protruding forward.

9. The electro-hydraulic dual-poppet underwater grab according to claim 8, characterized in that, The outer wall front edge of the bucket lip plate is an upwardly inclined chamfered slope, the tooth seat is divided into a welding part and a support part with a thickness obviously larger than the welding part, the welding part is welded on the lower surface of the bottom part, and the support part has an upper inclined surface welded with the chamfered slope and a lower inclined surface opposite to the upper inclined surface.

10. The electro-hydraulic dual-poppet underwater grab according to claim 9, characterized in that, The outer wall of the bucket bottom plate is also welded with a reinforcing rib supporting the tooth seat from the rear for each tooth seat, the reinforcing rib has a front end part welded on the rear end surface and the lower surface of the tooth seat and extending on the lower inclined surface, and the rear end part of the reinforcing rib extends to the rear end of the bucket bottom plate.

Images