Grab bucket

Abstract

The invention belongs to the technical field of electric hydraulic grab buckets, and particularly relates to a grab bucket which comprises a lifting table, a plurality of spherical grab bucket claws are movably mounted below the lifting table, two arc-shaped pieces are fixedly mounted on the side edge of each spherical grab bucket claw, and a plurality of supporting rods are movably mounted on the outer side of a hydraulic head. A spacing groove is formed between every two adjacent arc-shaped pieces, an arc-shaped oil bag is fixedly mounted at the inner top of each spacing groove, and when the multiple spherical grab buckets rotate to be in a closed state, the lower ends of the supporting rods can extrude the arc-shaped oil bags, so that the arc-shaped oil bags deform; when the outer sleeve is in use, lubricating oil stored in the arc-shaped oil bag can enter the fixing shaft along the first elastic pipe and the second elastic pipe, an oil groove can be formed in the fixing shaft, the oil entering the fixing shaft flows to the distance between the fixing shaft and the outer sleeve, and then the fixing shaft and the outer sleeve are lubricated.

Description

Technical Field

[0001] The invention belongs to the field of electric hydraulic grab buckets, in particular to a grab bucket. Background Art

[0002] An electric hydraulic grab is a grab that comes with a hydraulic system including a motor and a hydraulic pump, and is opened and closed by an external power source. It is widely used in many fields such as ports, steel mills, power plants, environmental protection, construction, railways, highways, mines, forestry, etc. It is mainly used for grabbing and loading and unloading various bulk materials. The main principle is to input hydraulic oil into the hydraulic structure under electric drive, so that the hydraulic column extends to provide a thrust to the grab, and then the entire grab opens to complete the grabbing and loading and unloading tasks.

[0003] A patent document with publication number CN102145854A discloses an electric four-petal hydraulic grab. In the present invention, a hanging device is a connecting part between the grab and the crane; a frame is arranged below the hanging device, one end of the hydraulic cylinder is fixed to the upper part of the frame through a pin shaft, and the other end is fixed to the claw petal through a pin shaft, and the extension and contraction of the hydraulic cylinder drives and controls the movement of the claw petal to complete the grabbing and dropping of materials; the claw petal is connected to the lower part of the frame through a pin shaft, and the motor, bidirectional hydraulic pump and control valve block are arranged inside the frame to constitute a hydraulic control unit of the electric four-petal hydraulic grab.

[0004] In the traditional technical solution, electric drive is used to extend the hydraulic rod through a thrust to open multiple grab claws. The extension of the hydraulic rod is driven by hydraulic oil, so it can work for a long time without the problem of insufficient lubrication affecting the opening of the grab. However, in the process of opening the grab, there are still rotating gas components. After long-term use, the lubrication effect is prone to deterioration, and the friction resistance becomes larger, affecting the opening of the grab.

[0005] To this end, the present invention provides a grab bucket. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: a grab bucket described in the present invention comprises a hydraulic head and a hydraulic rod installed below the hydraulic head, a lifting platform is fixedly installed below the hydraulic rod, a plurality of spherical grab claws are movably installed below the lifting platform, two arc-shaped parts are fixedly installed on the side of each of the spherical grab claws, a plurality of support rods are movably installed on the outer side of the hydraulic head, a spacing groove is provided between two adjacent arc-shaped parts, an arc-shaped oil bag is fixedly installed on the inner top of the spacing groove, the arc-shaped oil bag is fixedly connected to the outer side of the corresponding spherical grab claw, an axis groove is provided at the bottom of the support rod, a support shaft is movably installed inside the axis groove, and both ends of the support shaft are fixedly connected to the corresponding arc-shaped parts; A plurality of rotating components are movably installed on the outer side of the lifting platform, and the lifting platform is connected to a plurality of spherical grab claws through the plurality of rotating components. The plurality of rotating components include a plurality of fixed blocks fixedly installed under the lifting platform, a fixed shaft is fixedly installed between two adjacent fixed blocks, an outer sleeve is sleeved on the outer side of the fixed shaft, and the outer sleeve is located between two adjacent fixed blocks. A first elastic tube and a second elastic tube are fixedly installed on the top of the arc-shaped oil bag, and one end of the first elastic tube and the second elastic tube passes through the corresponding arc-shaped member and is connected to the end of the fixed shaft.

[0008] Preferably, two third elastic tubes are fixedly mounted on the outer side of the lower end of the arc-shaped oil bag, one end of the two third elastic tubes is connected to the support shaft, and the two third elastic tubes are located inside the corresponding arc-shaped member.

[0009] Preferably, two elastic members are slidably mounted in the side groove of the support rod toward the arc-shaped oil bag, the two elastic members are located at two poles of the same side of the support rod, and the two elastic members are located in the same horizontal plane.

[0010] Preferably, the elastic member comprises an extrusion block slidably mounted on the side of the support rod, two springs are fixedly mounted on one side of the extrusion block, and one end of the two springs is fixedly connected to the support rod.

[0011] Preferably, both ends of the fixed shaft are provided with connecting grooves, the connecting groove provided at one end of the fixed shaft is located at the inner top and is connected to one end of the first elastic tube, and the connecting groove provided at the other end of the fixed shaft is located at the inner top and is connected to one end of the second elastic tube.

[0012] Preferably, a semi-arc groove 1 is opened on the inner top of the fixed shaft, a semi-arc groove 2 is opened on the inner bottom of the fixed shaft, and a plurality of oil grooves are opened on the outer side of the fixed shaft, and the plurality of oil grooves are connected to the corresponding semi-arc groove 1 or semi-arc groove 2.

[0013] Preferably, the semi-arc groove 1 is connected to the connecting groove opened at the inner top, and the semi-arc groove 2 is connected to the connecting groove opened at the inner bottom.

[0014] Preferably, multiple lubrication components are fixedly installed inside the semi-arc groove one and the semi-arc groove two, and the multiple lubrication components inside the semi-arc groove two are arranged opposite to the multiple lubrication components inside the semi-arc groove one.

[0015] Preferably, the lubricating component includes an upper semicircular ring 1 fixedly mounted on the top of the semi-arc groove 1 and a lower semicircular ring 1 fixedly mounted on the bottom of the semi-arc groove 1, and the lubricating component also includes an upper semicircular ring 2 fixedly mounted on the top of the semi-arc groove 1 and a lower semicircular ring 2 fixedly mounted on the bottom of the semi-arc groove 1, the width of the upper semicircular ring 2 is smaller than the width of the upper semicircular ring 1, and the width of the lower semicircular ring 2 is smaller than the width of the lower semicircular ring 1.

[0016] Preferably, the supporting shaft and the fixed shaft are components made of the same structure, one of the third elastic tubes is connected to the inner top of one end of the supporting shaft, and the other third elastic tube is connected to the inner bottom of the other end of the supporting shaft.

[0017] The beneficial effects of the present invention are as follows: 1. A grab bucket described in the present invention, after the hydraulic rod is extended, will drive the lifting platform and multiple rotating components to descend. At this time, the upper ends of the multiple spherical grab buckets are subjected to force, but the spherical grab buckets are movably connected to the ends of the support rods through the support shafts. Therefore, the multiple support rods will slightly rotate toward the outside of the device, and the backs of the multiple spherical grab buckets will rotate around the support shaft as the center of the circle, and the upper ends of the multiple spherical grab buckets will rotate around the fixed shaft as the center of the circle. When the hydraulic rod is extended to the limit state, the multiple spherical grab buckets will rotate a certain angle, that is, the multiple spherical grab buckets are in an open state. When the hydraulic rod is retracted to the limit state, the multiple spherical grab buckets will rotate in the opposite direction, that is, the multiple spherical grab buckets are in a closed state. In the process of opening and closing the multiple spherical grab buckets, the required materials are grabbed and loaded and unloaded.

[0018] 2. A grab bucket described in the present invention, when the multiple spherical grab buckets are rotated into a closed state, the lower end of the support rod will squeeze the arc-shaped oil bag, thereby causing the arc-shaped oil bag to deform, and the lubricating oil stored in the arc-shaped oil bag will enter the fixed shaft along the first elastic tube and the second elastic tube. An oil groove can be provided in the fixed shaft to allow the oil entering the fixed shaft to flow to the gap between the fixed shaft and the outer sleeve, thereby lubricating the fixed shaft and the outer sleeve. When the multiple spherical grab buckets are in an open state, the lower end of the support rod support rod does not contact the arc-shaped oil bag, the arc-shaped oil bag is no longer deformed, and the lubricating oil entering the fixed shaft flows back to the arc-shaped oil bag through the first elastic tube and the second elastic tube. Through the continuous operation of the multiple spherical grab buckets, the lubricating oil in the arc-shaped oil bag can enter the fixed shaft again and again to lubricate the gap between the fixed shaft and the fixed block, and the support shaft can be lubricated in the same way.

[0019] 3. The grab bucket described in the present invention, after the arc-shaped oil bag is deformed, part of the lubricating oil transported enters the interior of the semi-arc groove one through the first elastic tube and the connecting groove until the semi-arc groove one and multiple oil grooves connected to the semi-arc groove one are filled. The lubricating oil can enter the distance between the fixed shaft and the outer sleeve through the multiple oil grooves, so that the rotating surfaces of the fixed shaft and the outer sleeve are fully acted upon by the lubricating oil, and the friction resistance will not increase when the outer sleeve rotates. When the arc-shaped oil bag is no longer deformed, the lubricating oil inside the fixed shaft will flow back into the interior of the arc-shaped oil bag. Because the interiors of the multiple oil grooves were previously full of lubricating oil, after the lubricating oil flows back, an oil film will be generated at one end of the oil groove facing the inner wall of the outer sleeve, and this oil film contacts the inner wall of the outer sleeve, that is, there is an oil film generated by multiple oil grooves between the outer side of the fixed shaft and the inner wall of the outer sleeve, which makes the rotation of the fixed shaft and the outer sleeve more flexible, thereby improving the grabbing and loading efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is an overall stereogram of the present invention; Figure 2 It is a three-dimensional schematic diagram of the rotating component and the arc-shaped oil bag in the present invention; Figure 3 It is a three-dimensional schematic diagram of the spherical grab claw in the present invention; Figure 4 It is a three-dimensional schematic diagram of the rotating component in the present invention; Figure 5 It is a three-dimensional schematic diagram of the support rod in the present invention; Figure 6 It is a three-dimensional schematic diagram of the elastic member in the present invention; Figure 7 It is a three-dimensional schematic diagram of the fixed axis in the present invention; Figure 8 It is a three-dimensional schematic diagram of the semi-arc groove 2 and the lubricating component in the present invention; Fig. 9 It is a three-dimensional schematic diagram of the lubricating component in the present invention; Fig.10 It is a schematic diagram of the principle of the lubrication component in the present invention.

[0022] In the figure: 1. spherical grab claw; 2. hydraulic rod; 3. support rod; 31. support shaft; 32. shaft groove; 33. elastic member; 331. extrusion block; 332. spring; 4. lifting platform; 5. hydraulic head; 6. arc member; 61. spacing groove; 7. arc oil bag; 71. first elastic tube; 72. second elastic tube; 73. third elastic tube; 8. rotating member; 81. fixed block; 82. fixed shaft; 821. connecting groove; 822. oil groove; 823. semi-arc groove one; 824. semi-arc groove two; 825. lubricating member; 8251. upper semicircular ring one; 8252. lower semicircular ring one; 8253. upper semicircular ring two; 8254. lower semicircular ring two; 83. outer sleeve. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Example

[0024] like Figure 1-4 As shown, a grab bucket according to an embodiment of the present invention comprises a hydraulic head 5 and a hydraulic rod 2 installed below the hydraulic head 5, a lifting platform 4 is fixedly installed below the hydraulic rod 2, a plurality of spherical grab claws 1 are movably installed below the lifting platform 4, two arc-shaped parts 6 are fixedly installed on the side of each spherical grab claw 1, a plurality of support rods 3 are movably installed on the outer side of the hydraulic head 5, a spacing groove 61 is provided between two adjacent arc-shaped parts 6, an arc-shaped oil bag 7 is fixedly installed on the inner top of the spacing groove 61, and the arc-shaped oil bag 7 is fixedly connected to the outer side of the corresponding spherical grab claw 1, an axis groove 32 is provided at the bottom of the support rod 3, a support shaft 31 is movably installed inside the axis groove 32, and both ends of the support shaft 31 are fixedly connected to the corresponding arc-shaped parts 6; A plurality of rotating components 8 are movably installed on the outer side of the lifting platform 4, and the lifting platform 4 is connected to the plurality of spherical grab claws 1 through the plurality of rotating components 8. The plurality of rotating components 8 include a plurality of fixed blocks 81 fixedly installed below the lifting platform 4, a fixed shaft 82 is fixedly installed between two adjacent fixed blocks 81, an outer sleeve 83 is sleeved on the outer side of the fixed shaft 82, and the outer sleeve 83 is located between the two adjacent fixed blocks 81, and a first elastic tube 71 and a second elastic tube 72 are fixedly installed on the top of the arc-shaped oil bag 7, and one end of the first elastic tube 71 and the second elastic tube 72 passes through the corresponding arc-shaped member 6 and is connected to the end of the fixed shaft 82.

[0025] Specifically, a hydraulic device is installed inside the hydraulic head 5. When the device is needed to work, the device is lifted through an external connection structure. Under electric or hydraulic drive, hydraulic oil is input into the hydraulic device inside the hydraulic head 5 to extend the hydraulic rod 2. Originally, the multiple spherical grabs 1 are in a closed state. When the hydraulic rod 2 is extended, the lifting platform 4 and the multiple rotating components 8 are driven to descend. At this time, the upper ends of the multiple spherical grabs 1 are subjected to force, but the spherical grabs 1 are movably connected to the ends of the support rods 3 through the support shafts 31. Therefore, the multiple support rods 3 will rotate slightly toward the outside of the device, and the backs of the multiple spherical grabs 1 will rotate around the support shafts 31. The multiple spherical grabs 1 The upper end of the spherical grab 1 rotates with the fixed shaft 82 as the center. When the hydraulic rod 2 is extended to the limit state, the multiple spherical grabs 1 will rotate to a certain angle, that is, the multiple spherical grabs 1 are in an open state. When the hydraulic rod 2 is retracted to the limit state, the multiple spherical grabs 1 will rotate in the opposite direction, that is, the multiple spherical grabs 1 are in a closed state. In the process of opening and closing the multiple spherical grabs 1, the required materials are grabbed and loaded and unloaded. The spherical grab 1 mainly relies on two rotating structures during the rotation process. The rotating mechanism is the support shaft 31 and the rotating member 8. The device adopts the input method of hydraulic oil as the driving method of the hydraulic rod 2. In this way, the hydraulic rod 2 will be given sufficient lubrication, so the hydraulic The extension and retraction of the pressure rod 2 will not cause the friction resistance to increase due to insufficient lubrication, but this situation will occur in the support shaft 31 and the rotating member 8. In this device, the upper end position of the spacing groove 61 is fixedly installed with an arc-shaped oil bag 7. When the multiple ball grabs 1 are in an open state, the lower end of the support rod 3 does not contact the arc-shaped oil bag 7. When the multiple ball grabs 1 are rotated to a closed state, the lower end of the support rod 3 will squeeze the arc-shaped oil bag 7, thereby causing the arc-shaped oil bag 7 to deform. The lubricating oil stored in the arc-shaped oil bag 7 will flow along the first elastic tube 71 and the second elastic tube 72 into the fixed shaft 82. An oil groove can be set in the fixed shaft 82 to allow the oil to enter the fixed shaft 82. The oil inside the shaft 82 flows to the gap between the fixed shaft 82 and the outer sleeve 83, thereby lubricating the fixed shaft 82 and the outer sleeve 83. When the multiple spherical grabs 1 are in the open state, the lower end of the support rod 3 does not contact the arc-shaped oil bag 7, and the arc-shaped oil bag 7 no longer deforms. The lubricating oil entering the fixed shaft 82 flows back to the arc-shaped oil bag 7 through the first elastic tube 71 and the second elastic tube 72. Through the continuous operation of the multiple spherical grabs 1, the lubricating oil inside the arc-shaped oil bag 7 can enter the fixed shaft 82 again and again, lubricating the gap between the fixed shaft 82 and the fixed block 81, and the support shaft 31 can be lubricated in the same way.

[0026] like Figure 4As shown, two third elastic tubes 73 are fixedly installed on the outer side of the lower end of the arc-shaped oil bag 7, one end of the two third elastic tubes 73 is connected to the support shaft 31, and the two third elastic tubes 73 are located inside the corresponding arc-shaped member 6.

[0027] Specifically, when the arc-shaped oil bag 7 is not squeezed by the support rod 3, under the factor of gravity, the lubricating oil at the bottom of the arc-shaped oil bag 7 will enter the support shaft 31 through the two third elastic tubes 73. An oil groove is also provided in the support shaft 31 to allow the lubricating oil in the support shaft 31 to flow to the gap between the support shaft 31 and the shaft groove 32 to lubricate it, thereby extending the service life of the device.

[0028] like Figure 5-6 As shown, two elastic members 33 are slidably installed in the side groove of the support rod 3 toward the arc-shaped oil bag 7. The two elastic members 33 are located at two poles of the same side of the support rod 3, and the two elastic members 33 are located in the same horizontal plane. The elastic member 33 includes an extrusion block 331 slidably installed on the side of the support rod 3, and two springs 332 are fixedly installed on one side of the extrusion block 331, and one end of the two springs 332 is fixedly connected to the support rod 3.

[0029] Specifically, when the spherical grab bucket 1 rotates and causes the support rod 3 to squeeze the arc-shaped oil bag 7, the two elastic members 33 will first squeeze the arc-shaped oil bag 7, and the squeezing point will block the two third elastic tubes 73, so that when the arc-shaped oil bag 7 is deformed, the lubricating oil inside it will not pass through the third elastic tube 73 to enter the support shaft 31, so as to avoid the third elastic tube 73 from expanding and the lubricating oil inside the arc-shaped oil bag 7 from becoming less, so that as much lubricating oil as possible is transmitted to the inside of the fixed shaft 82 due to the deformation of the arc-shaped oil bag 7. When the support rod 3 continues to squeeze the arc-shaped oil bag 7, the spring 332 will contract, allowing the squeezing block 331 to completely slide into the inside of the support rod 3, without affecting the subsequent large-area squeezing of the arc-shaped oil bag 7 by the support rod 3.

[0030] like Figure 7-8 As shown, connecting grooves 821 are provided at both ends of the fixed shaft 82. The connecting groove 821 provided at one end of the fixed shaft 82 is located at the inner top and communicates with one end of the first elastic tube 71. The connecting groove 821 provided at the other end of the fixed shaft 82 is located at the inner top and communicates with one end of the second elastic tube 72. A semi-arc groove 1 823 is provided at the inner top of the fixed shaft 82, and a semi-arc groove 2 824 is provided at the inner bottom of the fixed shaft 82. A plurality of oil grooves 822 are provided on the outer side of the fixed shaft 82, and the plurality of oil grooves 822 are communicated with the corresponding semi-arc groove 1 823 or the semi-arc groove 2 824.

[0031] The semi-arc groove 1 823 is connected to the connecting groove 821 opened at the inner top, and the semi-arc groove 2 824 is connected to the connecting groove 821 opened at the inner bottom.

[0032] Specifically, part of the lubricating oil delivered after the arc-shaped oil bag 7 is deformed enters the semi-arc-shaped groove 1 823 through the first elastic tube 71 and the connecting groove 821, until the semi-arc-shaped groove 1 823 and the multiple oil grooves 822 connected to the semi-arc-shaped groove 1 823 are filled, and the lubricating oil can enter the gap between the fixed shaft 82 and the outer sleeve 83 through the multiple oil grooves 822, so that the rotating surface of the fixed shaft 82 and the outer sleeve 83 is fully acted by the lubricating oil, and the friction resistance will not increase when the outer sleeve 83 rotates. When 7 is not deformed, the lubricating oil inside the fixed shaft 82 will flow back into the interior of the arc-shaped oil bag 7. Because the interior of the multiple oil grooves 822 is filled with lubricating oil, after the lubricating oil flows back, an oil film will be generated at one end of the oil groove 822 facing the inner wall of the outer sleeve 83. This oil film contacts the inner wall of the outer sleeve 83, that is, there is an oil film generated by the multiple oil grooves 822 between the outer side of the fixed shaft 82 and the inner wall of the outer sleeve 83, which makes the rotation of the fixed shaft 82 and the outer sleeve 83 more flexible, thereby improving the efficiency of grabbing and loading of the device. Example

[0033] like Figure 9-10 As shown, compared with Example 1, another embodiment of the present invention is: multiple lubrication components 825 are fixedly installed inside the semi-arc groove 1 823 and the semi-arc groove 2 824, and the multiple lubrication components 825 inside the semi-arc groove 2 824 are arranged in the opposite direction to the multiple lubrication components 825 inside the semi-arc groove 1 823.

[0034] The lubricating component 825 includes an upper semicircular ring 8251 fixedly installed at the top of the semi-arc groove 823 and a lower semicircular ring 8252 fixedly installed at the bottom of the semi-arc groove 823. The lubricating component 825 also includes an upper semicircular ring 8253 fixedly installed at the top of the semi-arc groove 823 and a lower semicircular ring 8254 fixedly installed at the bottom of the semi-arc groove 823. The width of the upper semicircular ring 8253 is smaller than the width of the upper semicircular ring 8251, and the width of the lower semicircular ring 8254 is smaller than the width of the lower semicircular ring 8252.

[0035] Specifically, when the lubricating oil enters the semi-arc groove 823 through the connecting groove 821, it will first contact a lubricating member 825. The outer side of the upper semi-circular ring 8251 is in full contact with the inner top wall of the semi-arc groove 823, and the inner wall of the lower semi-circular ring 8252 is in full contact with the inner bottom wall of the semi-arc groove 823. The upper semi-circular ring 8251 and the lower semi-circular ring 8252 are both inclined, so the lubricating oil can only enter from the upper semi-circular ring 8251. The lubricating oil that continues to pass through will enter the other positions of the semi-arc groove 1 823 from the gap between the upper semi-arc ring 8251 and the lower semi-arc ring 1 8252. Only the two ends of the upper semi-arc ring 2 8253 and the lower semi-arc ring 2 8254 are fixedly connected to the inner wall of the semi-arc groove 1 823. Therefore, the lubricating oil that continues to pass through will enter the other positions of the semi-arc groove 1 823 from the gap between the upper semi-arc ring 2 8253 and the lower semi-arc ring 2 8254, the gap between the upper semi-arc ring 2 8253 and the inner top wall of the semi-arc groove 1 823, and the gap between the lower semi-arc ring 2 The lubricating oil entering from both sides will collide with the lubricating oil entering from the gap between the upper semicircular ring 2 8253 and the lower semicircular ring 2 8254, thereby slowing down the rate at which the lubricating oil enters the interior of the fixed shaft 82, allowing the lubricating oil to slowly fill various places inside the semicircular groove 1 823, that is, every time the lubricating oil flows to a place, it will fill up the place completely. The oil groove 822 can be set between the upper semicircular ring 1 8251 and the upper semicircular ring 2 8253, and the oil grooves 822 are filled one by one through the circulation of the lubricating oil, so as to avoid the subsequent lubricating oil not being able to fill the entire semicircular groove 1 823 and not playing a lubricating role. When the lubricating oil enters the interior of the fixed shaft 82, the circulation rate will be reduced, but when the lubricating oil flows back to the arc-shaped oil bag 7, there will be no collision between the lubricating oils, so the flow will be faster.

[0036] like Figure 4 and Figure 8 As shown, the support shaft 31 and the fixed shaft 82 are components made of the same structure, one third elastic tube 73 is connected to the top inner end of one end of the support shaft 31, and the other third elastic tube 73 is connected to the bottom inner end of the other end of the support shaft 31.

[0037] Specifically, when the lubricating oil enters the support shaft 31 through the third elastic tube 73, it will also fill up the semi-arc groove 1 823, the semi-arc groove 2 824 and the oil groove 822 opened inside the support shaft 31, and then lubricate the distance between the support shaft 31 and the shaft groove 32. The provision of multiple lubricating components 825 allows multiple oil grooves 822 to be filled successively.

[0038] Working principle: a hydraulic device is installed inside the hydraulic head 5. When the device is needed to work, the device is lifted through an external link structure. Under electric drive, hydraulic oil is input into the hydraulic device inside the hydraulic head 5 to extend the hydraulic rod 2. Originally, the multiple spherical grabs 1 are in a closed state. When the hydraulic rod 2 is extended, it will drive the lifting platform 4 and multiple rotating components 8 to descend. At this time, the upper ends of the multiple spherical grabs 1 are subjected to force, but the spherical grabs 1 are movably connected to the ends of the support rods 3 through the support shafts 31. Therefore, the multiple support rods 3 will rotate slightly toward the outside of the device, and the backs of the multiple spherical grabs 1 will rotate around the support shafts 31 as the center of the circle. The end of the ball grab 1 rotates with the fixed shaft 82 as the center. When the hydraulic rod 2 is extended to the limit state, the multiple ball grabs 1 will rotate to a certain angle, that is, the multiple ball grabs 1 are in an open state. When the hydraulic rod 2 is retracted to the limit state, the multiple ball grabs 1 will rotate in the opposite direction, that is, the multiple ball grabs 1 are in a closed state. In the process of opening and closing the multiple ball grabs 1, the required materials are grabbed and loaded and unloaded. The ball grab 1 mainly relies on two rotating structures during the rotation process. The rotating mechanism is the support shaft 31 and the rotating member 8. The device adopts the input method of hydraulic oil as the driving method of the hydraulic rod 2. In this way, the hydraulic rod 2 will be given sufficient lubrication, so the hydraulic The extension and retraction of the rod 2 will not cause the friction resistance to increase due to insufficient lubrication, but this situation will occur in the support shaft 31 and the rotating member 8. In this device, the upper end position of the spacing groove 61 is fixedly installed with an arc-shaped oil bag 7. When the multiple ball grabs 1 are in an open state, the lower end of the support rod 3 does not contact the arc-shaped oil bag 7. When the multiple ball grabs 1 are rotated to a closed state, the lower end of the support rod 3 will squeeze the arc-shaped oil bag 7, thereby causing the arc-shaped oil bag 7 to deform. The lubricating oil stored in the arc-shaped oil bag 7 will flow along the first elastic tube 71 and the second elastic tube 72 into the fixed shaft 82. An oil groove can be set in the fixed shaft 82 to allow the oil to enter the fixed shaft The oil inside 82 flows to the gap between the fixed shaft 82 and the outer sleeve 83, thereby lubricating the fixed shaft 82 and the outer sleeve 83. When the multiple spherical grab buckets 1 are in the open state, the lower end of the support rod 3 does not contact the arc-shaped oil bag 7, and the arc-shaped oil bag 7 no longer deforms. The lubricating oil entering the fixed shaft 82 flows back to the arc-shaped oil bag 7 through the first elastic tube 71 and the second elastic tube 72. Through the continuous operation of the multiple spherical grab buckets 1, the lubricating oil inside the arc-shaped oil bag 7 can enter the fixed shaft 82 again and again, lubricate the gap between the fixed shaft 82 and the fixed block 81, and the support shaft 31 can be lubricated in the same way.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A grab bucket, comprising a hydraulic head (5) and a hydraulic rod (2) installed below the hydraulic head (5), a lifting platform (4) fixedly installed below the hydraulic rod (2), a plurality of spherical grab claws (1) movably installed below the lifting platform (4), two arc-shaped parts (6) fixedly installed on the side of each spherical grab claw (1), a plurality of support rods (3) movably installed on the outer side of the hydraulic head (5), characterized in that: A spacing groove (61) is provided between two adjacent arc-shaped members (6), an arc-shaped oil bag (7) is fixedly installed on the inner top of the spacing groove (61), and the arc-shaped oil bag (7) is fixedly connected to the outer side of the corresponding spherical grab claw (1); an axis groove (32) is provided at the bottom of the support rod (3), a support shaft (31) is movably installed inside the axis groove (32), and both ends of the support shaft (31) are fixedly connected to the corresponding arc-shaped members (6); A plurality of rotating components (8) are movably mounted on the outer side of the lifting platform (4). The lifting platform (4) is connected to a plurality of spherical grab claws (1) via the plurality of rotating components (8). The plurality of rotating components (8) include a plurality of fixed blocks (81) fixedly mounted below the lifting platform (4). A fixed shaft (82) is fixedly mounted between two adjacent fixed blocks (81). An outer sleeve (83) is sleeved on the outer side of the fixed shaft (82). The outer sleeve (83) is located between the two adjacent fixed blocks (81). A first elastic tube (71) and a second elastic tube (72) are fixedly mounted on the top of the arc-shaped oil bag (7). One end of the first elastic tube (71) and the second elastic tube (72) penetrates the corresponding arc-shaped member (6) and is connected to the end of the fixed shaft (82).

2. A grab bucket according to claim 1, characterized in that: Two third elastic tubes (73) are fixedly mounted on the outer side of the lower end of the arc-shaped oil bag (7), one end of the two third elastic tubes (73) is connected to the support shaft (31), and the two third elastic tubes (73) are located inside the corresponding arc-shaped member (6).

3. A grab bucket according to claim 1, characterized in that: Two elastic members (33) are slidably mounted in the side groove of the support rod (3) toward the arc-shaped oil bag (7), and the two elastic members (33) are located at two poles of the same side of the support rod (3), and the two elastic members (33) are located on the same horizontal plane.

4. A grab bucket according to claim 3, characterized in that: The elastic member (33) comprises an extrusion block (331) slidably mounted on the side of the support rod (3), two springs (332) are fixedly mounted on one side of the extrusion block (331), and one end of the two springs (332) is fixedly connected to the support rod (3).

5. A grab bucket according to claim 1, characterized in that: Both ends of the fixed shaft (82) are provided with connecting grooves (821); the connecting groove (821) provided at one end of the fixed shaft (82) is located at the inner top and is connected to one end of the first elastic tube (71); the connecting groove (821) provided at the other end of the fixed shaft (82) is located at the inner top and is connected to one end of the second elastic tube (72).

6. A grab bucket according to claim 5, characterized in that: A semi-arc groove 1 (823) is provided at the inner top of the fixed shaft (82), a semi-arc groove 2 (824) is provided at the inner bottom of the fixed shaft (82), and a plurality of oil grooves (822) are provided at the outer side of the fixed shaft (82), and the plurality of oil grooves (822) are connected to the corresponding semi-arc groove 1 (823) or the semi-arc groove 2 (824).

7. A grab bucket according to claim 6, characterized in that: The semi-arc groove 1 (823) is connected to the connecting groove (821) provided at the inner top, and the semi-arc groove 2 (824) is connected to the connecting groove (821) provided at the inner bottom.

8. A grab bucket according to claim 7, characterized in that: A plurality of lubricating components (825) are fixedly installed inside the semi-arc groove one (823) and the semi-arc groove two (824), and the plurality of lubricating components (825) inside the semi-arc groove two (824) are arranged in the opposite direction to the plurality of lubricating components (825) inside the semi-arc groove one (823).

9. A grab bucket according to claim 8, characterized in that: The lubricating component (825) comprises an upper semicircular ring 1 (8251) fixedly mounted on the top of the semi-arc groove 1 (823) and a lower semicircular ring 1 (8252) fixedly mounted on the bottom of the semi-arc groove 1 (823). The lubricating component (825) further comprises an upper semicircular ring 2 (8253) fixedly mounted on the top of the semi-arc groove 1 (823) and a lower semicircular ring 2 (8254) fixedly mounted on the bottom of the semi-arc groove 1 (823). The width of the upper semicircular ring 2 (8253) is smaller than the width of the upper semicircular ring 1 (8251), and the width of the lower semicircular ring 2 (8254) is smaller than the width of the lower semicircular ring 1 (8252).

10. A grab bucket according to claim 2, characterized in that: The support shaft (31) and the fixed shaft (82) are components made of the same structure, one of the third elastic tubes (73) is connected to the top inner portion of one end of the support shaft (31), and the other of the third elastic tubes (73) is connected to the bottom inner portion of the other end of the support shaft (31).

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