Grab bucket driving device

Abstract

A grab bucket driving device comprises a mounting frame; the supporting shaft is fixed on the mounting frame; the supporting shell is rotatably arranged outside the supporting shaft in a sleeving manner; the rotary driver is arranged at the end part of the supporting shaft; the grab bucket hanging frame is used for hanging a grab bucket, the grab bucket hanging frame is connected with the rotary driver and the supporting shell, and the rotary driver is used for driving the grab bucket hanging frame to rotate within a preset rotation angle range relative to the supporting shaft; and the flow guide part is connected with the supporting shaft, the flow guide part, the supporting shaft and the supporting shell are provided with oil way structures, and the oil way structures are used for providing hydraulic driving force for the grab bucket. The end of the supporting shaft is prevented from being directly connected with the oil pipe due to the arrangement of the oil path structure in the flow guide piece, so that the oil pipe installation distance is guaranteed, and leakage of hydraulic oil is avoided; and the rolling bearings are adopted at the two ends of the supporting shaft to replace slewing bearings, so that the grab bucket driving device is smaller in occupied space and more flexible in rotation.

Description

Technical Field

[0001] The present application generally relates to the technical field of construction machinery. More specifically, the present application relates to a grab driving device. Background Art

[0002] The grab driving device plays an important role in the construction process of diaphragm walls, especially in hard strata. The grab driving device realizes complementary excavation by changing the position of the grab teeth, thereby improving the construction efficiency; or the grab driving device drives the grab body to rotate, so that the grab body can change its position in some places where it is not convenient for the grab to stand, thereby facilitating construction. However, the common grab driving devices currently have a complex structure. The end of the support shaft needs to be directly connected to the oil pipe, so that the installation distance of the oil pipe cannot be guaranteed and there is a risk of leakage; and the slewing bearing is used for the rotation and / or swing of the grab driving device, and the slewing bearing has a large size, so that more space requirements need to be considered when designing and arranging the grab driving device. The slewing bearing has a large initial friction force when starting, resulting in inflexible rotation and / or swing of the grab driving device.

[0003] Therefore, a new type of grab driving device is needed to avoid the direct connection of the end of the support shaft to the oil pipe, so as to ensure the installation distance of the oil pipe and avoid the leakage of hydraulic oil; and avoid using a slewing bearing, so that the space occupied by the grab driving device is smaller and the rotation is more flexible. Summary of the Utility Model

[0004] In view of this, the purpose of the present application is to provide a grab driving device to solve the problems that the structure of the existing grab driving device is complex, the installation accuracy is low, and there may be a risk of hydraulic oil leakage due to the need for the end of the support shaft to be directly connected to the oil pipe. And solve the problem that the volume occupied by the grab driving device is too large and it cannot rotate flexibly due to the use of a slewing support in the existing grab driving device.

[0005] The technical solution adopted by the present application is as follows:

[0006] An embodiment of the present application provides a grab driving device, including: a mounting frame; a support shaft fixed on the mounting frame; a support housing rotatably sleeved outside the support shaft; a rotary driver installed at the end of the support shaft; a grab hanger for hanging the grab, the grab hanger is connected to the rotary driver and the support housing, and the rotary driver is used to drive the grab hanger to rotate relative to the support shaft within a preset rotation angle range; and a flow guide member connected to the support shaft, and an oil circuit structure is provided in the flow guide member, the support shaft and the support housing, and the oil circuit structure is used to provide hydraulic driving force for the grab.

[0007] In one embodiment, the oil circuit structure includes a first shunt pipe opened inside the flow guide member and a second shunt pipe opened inside the support shaft, and the first shunt pipe communicates with the second shunt pipe.

[0008] In one embodiment, the grab driving device further includes a bearing mechanism sleeved on the support shaft and located between the inner wall of the support housing and the support shaft. The bearing mechanism includes a first bearing mechanism and a second bearing mechanism. The first bearing mechanism includes a first bearing roller and a first bearing seat. The first bearing seat is vertically sleeved on the support shaft adjacent to the flow guide member, and the first bearing roller is installed in the first bearing seat.

[0009] In one embodiment, the second bearing mechanism includes a second bearing roller and a second bearing seat. The second bearing seat is horizontally sleeved on the support shaft, and the second bearing roller is installed in the second bearing seat.

[0010] In one embodiment, the support housing includes a first support housing and a second support housing. The first support housing and the second support housing are fixedly connected. The first support housing includes a first enclosing plate for enclosing around the support shaft and a first top cover connected to the top edge of the enclosing plate. The outer ring of the first bearing seat abuts against the inner wall of the first top cover.

[0011] In one embodiment, the second support housing includes a second enclosing plate for enclosing around the support shaft and a bottom plate connected to the bottom edge of the second enclosing plate. The second enclosing plate is fixedly connected to the first enclosing plate. A third shunt pipe is formed in the radial direction in the second enclosing plate. The third oil shunt pipe communicates with the second shunt pipe. The outer ring of the second bearing seat abuts against the inner wall of the second enclosing plate.

[0012] In one embodiment, the second shunt pipe includes a first docking section and a shunt section. The first docking section is arranged along the axial direction of the first shunt pipe, and the shunt section is arranged along the radial direction of the second shunt pipe. One end of the shunt section communicates with the end of the first docking section far from the first shunt pipe, and the other end of the shunt section communicates with the third oil shunt pipe.

[0013] In one embodiment, the first shunt section pipe includes a fluid conveying section, a guiding section and a second docking section. The fluid conveying section fluidly connects the guiding section to the outside of the flow guide member and extends along the radial direction of the flow guide plate.

[0014] In one embodiment, the guiding section extends along the length direction of the flow guide member, and one end of the guiding section far from the fluid conveying section communicates with the second docking section.

[0015] In one embodiment, the second docking section extends along the radial direction of the flow guide member, and one end of the second docking section away from the flow guiding section communicates with the second flow dividing pipe.

[0016] In the technical solution of the present application, a method of opening an oil passage structure in the flow guide member is adopted to transmit hydraulic oil, without docking the end of the support shaft with the oil pipe, so that the structural design of the grab driving device is simple, the installation distance of the oil pipe is ensured, and the leakage of hydraulic oil is avoided. And rolling bearings are used at both ends of the support shaft instead of a slewing bearing, so that the grab driving device occupies less space and rotates more flexibly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the grab driving device provided for the embodiment of the present application.

[0019] Figure 2 For Figure 1 It is a cross-sectional structural schematic diagram of the first bearing mechanism in the grab driving device shown.

[0020] Figure 3 For Figure 1 It is a cross-sectional structural schematic diagram of the second bearing mechanism in the grab driving device shown.

[0021] Figure 4 For Figure 1 It is a cross-sectional structural schematic diagram of the flow guide member in the grab driving device shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will combine the drawings to describe in detail specific embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the description of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0023] In the description of the present application, unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0025] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0026] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including the listed elements, it may also include other elements not specifically listed.

[0027] Please refer to Figures 1 to 4 , this embodiment provides a grab driving device 100, an installation frame 10; a support shaft 20 fixed on the installation frame 10; a support housing 30 rotatably sleeved outside the support shaft 20; a rotary drive 70 installed at the end of the support shaft 20; a grab hanger 40 for hanging the grab 80, the grab hanger 40 is connected to the rotary drive 70 and the support housing 30, and the rotary drive 70 is used to drive the grab hanger 40 to rotate relative to the support shaft 20 within a preset rotation angle range; and a flow guide member 50 connected to the support shaft 20, and the flow guide member 50, the support shaft 20 and the support housing 30 are provided with an oil passage structure, and the oil passage structure is used to provide hydraulic driving force for the grab 80.

[0028] Specifically, the mounting bracket 10 is used to mount and fix the support shaft 20 and the flow guide member 50. The support shaft 20 is the core shaft of the grab driving device 100. One end of the support shaft 20 is vertically fixed to the mounting bracket 10 through the flow guide member 50. In this embodiment, the flow guide member 50 is preferably a flow guide plate; the other end of the support shaft 20 is connected to the rotary drive 70 through a flange 90. Preferably, the rotary drive 70 is a swing cylinder. The support housing 30 is rotatably sleeved outside the support shaft 20, and the inner diameter of the support housing 30 matches the outer diameter of the support shaft 20, enabling it to rotate around the support shaft 20. The grab hanging bracket 40 is used to hang the grab 80. Driven by the rotary drive 70, the grab hanging bracket 40 can rotate and / or swing around the support shaft 20 within a preset rotation angle range to achieve the rotation and / or swing operation of the grab 80. The flow guide member 50 is fixedly connected to the support shaft 20 and together with the support shaft 20 and the support housing 30 constitutes an oil circuit structure.

[0029] Further, the hydraulic oil is output from the high-pressure oil pump of the hydraulic system, enters the oil circuit inside the flow guide member 50 through the oil pipe, enters the oil circuit inside the support shaft 20 through the oil circuit inside the flow guide member 50, then enters the oil circuit inside the support housing 30 through the oil circuit inside the support shaft 20, and finally enters the hydraulic cylinder of the grab 80, finally realizing the hydraulic drive of the grab 80 to open or close the grab 80. The entire device adjusts the flow rate and pressure of the hydraulic oil through a control valve, thereby achieving precise control of the grab 80.

[0030] The oil circuit structure includes a first shunt pipe 51 opened inside the flow guide member 50 and a second shunt pipe 22 opened inside the support shaft 20, and the second shunt pipe 22 communicates with the first shunt pipe 51.

[0031] Specifically, the first shunt pipe 51 is used to guide the hydraulic oil into the internal oil circuit of the support shaft 20, and the second shunt pipe 22 extends along the axial direction of the support shaft 20.

[0032] The grab driving device 100 further includes a bearing mechanism 60. The bearing mechanism 60 is sleeved on the support shaft 20 and is located between the inner wall of the support housing 30 and the support shaft 20. The bearing mechanism 60 includes a first bearing mechanism 61 and a second bearing mechanism 62. The first bearing mechanism 61 includes a first bearing roller 611 and a first bearing seat 612. The first bearing seat 612 is vertically sleeved on the support shaft 20 adjacent to the flow guide member 50, and the first bearing roller 611 is installed in the first bearing seat 612.

[0033] The support housing 30 includes a first support housing 31 and a second support housing 32. The first support housing 31 is fixedly connected to the second support housing 32. The first support housing 31 includes a first enclosing plate 311 for enclosing around the support shaft 20 and a first top cover 312 connected to the top edge of the first enclosing plate 311. The outer ring 612A of the first bearing seat 612 abuts against the inner wall of the first top cover 312.

[0034] Specifically, the outer ring 612A and the inner ring 612B of the first bearing seat 612 are in a substantially vertical position relationship. Among them, the top and the side wall of the outer ring 612A of the first bearing seat 612 abut against the inner wall of the first enclosing plate 311 and the inner wall of the first top cover 312 respectively; the axial direction of the first bearing roller 611 forms a certain angle with the axial direction of the support shaft 20 and is installed between the outer ring 612A and the inner ring 612B of the first bearing seat 612. The inner ring 612B of the first bearing seat 612 is supported by the first bearing roller 611 and thus sleeved on the support shaft 20. The first bearing mechanism 61 can bear the axial and radial loads from the first support housing 31, thereby ensuring the stability and low-friction rotation performance of the first support housing 31 during rotation, and at the same time providing stable support for the support shaft 20 to the first support housing 31.

[0035] The second bearing mechanism 62 includes a second bearing roller 621 and a second bearing seat 622. The second bearing seat 622 is horizontally sleeved on the support shaft 20, and the second bearing roller 621 is installed in the second bearing seat 622.

[0036] The second support housing 32 includes a second enclosing plate 321 for enclosing around the support shaft 20 and a bottom plate 322 connected to the bottom edge of the second enclosing plate 321. The second enclosing plate 321 is fixedly connected to the first enclosing plate 311. A third flow dividing pipe 321A is formed in the radial direction of the second enclosing plate 321, and the third oil pipe 321A communicates with the second flow dividing pipe 22. The outer ring 622A of the second bearing seat 622 abuts against the inner wall of the second enclosing plate 321.

[0037] Specifically, the second bearing mechanism 62 is located at one end of the support shaft 20 adjacent to the rotary drive 70. The side wall of the outer ring 622A of the second bearing seat 622 abuts against the inner wall of the second enclosing plate 321. The inner ring 622B of the second bearing seat 622 is coaxial with the outer ring 622A of the second bearing seat 622 and is sleeved on the support shaft 20. The second bearing roller 621 is installed between the outer ring 622A and the inner ring 622B of the second bearing seat 622. The first bearing mechanism 62 can bear the axial load from the second support housing 32, thereby ensuring the stability and low-friction rotation performance of the second support housing 32 during rotation.

[0038] Further, the first shroud 311 includes a first vertical section 311A and a first horizontal section 311B. The second shroud 321 includes a second vertical section 321A and a second horizontal section 321B. The grab hanger 40 includes a hanger top plate 41, a connecting plate 42, and a hanger bottom plate 43. The hanger top plate 41 and the hanger bottom plate 43 are fixedly connected by the connecting plate 42. Among them, the vertical section 311A of the first shroud 311 is fixedly connected to the horizontal section 321B of the second shroud 321 by bolts; the horizontal section 312A of the first shroud 311 is fixedly connected to the hanger top plate 41 by bolts. The drive rotator 70 is fixed on the hanger bottom plate 32.

[0039] The second shunt pipe 22 includes a first docking section 221 and a shunt section 222. The first docking section 221 is arranged along the axial direction of the first shunt pipe 51, and the shunt section 222 is arranged along the radial direction of the second shunt pipe 22. One end of the shunt section 222 communicates with the end of the first docking section 221 away from the first shunt pipe 51, and the other end of the shunt section 222 communicates with the third oil distribution pipe 321A.

[0040] Specifically, a plurality of second shunt pipes 22 are formed in the support shaft 20. In this embodiment, preferably two second shunt pipes 22 are provided in the support shaft 20. A sealing ring is provided at the connection between the first docking section 221 and the first shunt pipe 51 to prevent leakage of hydraulic oil. In order to avoid backflow of hydraulic oil and optimize the flow path of hydraulic oil, the lengths of different second shunt pipes 22 formed in the support shaft 20 are different.

[0041] Further, the number of the third oil distribution pipes 321A formed inside the second shroud 321 corresponds to the number of the second shunt pipes 22 formed inside the support shaft 20. The position where the third oil distribution pipe 321A is formed in the second shroud 321 corresponds to the shunt section 222 of the second shunt pipe 22. At the connection between the third shunt pipe and the shunt section 222 of the second shunt pipe 22, a groove 321B is formed along the circumferential direction of the inner wall where the second shroud 321 is in contact with the support shaft 20, which is used as a flow channel or buffer zone for hydraulic oil to ensure the uniform distribution of hydraulic oil between the support shaft 20 and the second shroud 321, thereby improving the flow of hydraulic oil, reducing the flow resistance, and ensuring that the hydraulic oil can be effectively transmitted to the required parts. Sealing rings are provided along the upper and lower parts of the support shaft 20 for the groove 321B to prevent leakage of hydraulic oil.

[0042] Still further, a pipe is connected to the end port of the third oil distribution pipe 321A away from the support shaft 20, and the pipe is connected to the actuator of the grab 80 through a flow control valve, thereby driving the grab 80 to open or close.

[0043] The first flow divider 51 includes a fluid conveyance section 511, a diversion section 512, and a second docking section 513. The fluid conveyance section 511 fluidly connects the diversion section 512 to the outside of the flow guiding member 50 and extends along the radial direction of the flow guiding member 50.

[0044] Specifically, the fluid conveyance section 511 is connected to a high-pressure oil pump outside for inputting hydraulic oil through an oil pipe, and the fluid conveyance end 511 is adjacent to the edge of the flow guiding member 50, which is used to make the installation position of the oil pipe more accurate, ensure that the oil pipe will not cause installation errors due to distance problems, and the accurate installation position helps to ensure the precise docking of the oil pipe and the flow guiding member 50, avoiding loosening or misalignment caused by installation errors. The installation accuracy of the oil pipe is high, the contact between the oil pipe and the flow guiding member 50 is closer, and the sealing performance is better, thereby reducing the risk of hydraulic oil leakage.

[0045] Furthermore, a plurality of first flow dividers 51 are provided inside the flow guiding member 50, and the number of the first flow dividers 51 corresponds to the number of the second flow dividers 222 in the support shaft 20. In this embodiment, the number of the first flow dividers 51 is two.

[0046] The diversion section 512 extends along the length direction of the flow guiding member 50, and one end of the diversion section 512 far from the fluid conveyance section 511 communicates with the second docking section 513.

[0047] Specifically, the diversion section 512 opens from the side wall of the flow guiding member 50 and extends along the length direction of the flow guiding member 50. A plug 52 is provided at the port of the opening end to prevent the leakage of hydraulic oil.

[0048] The second docking section 513 extends along the radial direction of the flow guiding member 50, and one end of the second docking section 513 far from the diversion section 512 communicates with the second flow divider 22.

[0049] Specifically, the second docking section 513 penetrates through the flow guiding member 50. Among them, a plug 52 is provided at the port of the end far from the second flow divider 22 to prevent the leakage of hydraulic oil. A sealing ring is provided at the connection between the second docking section 513 and the second flow divider 22 to prevent the leakage of hydraulic oil.

[0050] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A grab bucket driving device, characterized in that: include: Mounting frame; A support shaft fixed to the mounting frame; A support shell rotatably sleeved on the outside of the support shaft; a rotary driver mounted on the end of the support shaft; A grab bucket bracket for mounting a grab bucket, the grab bucket bracket being connected to the rotary driver and the support housing, the rotary driver being used to drive the grab bucket bracket to rotate relative to the support shaft; as well as A flow guide connected to the support shaft; an oil circuit structure is provided between the flow guide, the support shaft and the support shell, and the oil circuit structure is used to provide hydraulic driving force for the grab bucket.

2. The grab bucket driving device according to claim 1, characterized in that: The oil path structure includes a first shunt pipe opened inside the flow guide and a second shunt pipe opened inside the support shaft, wherein the second shunt pipe is connected to the first shunt pipe.

3. The grab bucket driving device according to claim 2, characterized in that: The grab bucket driving device also includes a bearing mechanism, which is sleeved on the support shaft and located between the inner wall of the support shell and the support shaft. The bearing mechanism includes a first bearing mechanism and a second bearing mechanism. The first bearing mechanism includes a first bearing roller and a first bearing seat. The first bearing seat is vertically sleeved on the support shaft adjacent to the guide member, and the first bearing roller is installed in the first bearing seat.

4. The grab bucket driving device according to claim 3, characterized in that: The second bearing mechanism includes a second bearing roller and a second bearing seat. The second bearing seat is horizontally sleeved on the support shaft, and the second bearing roller is installed in the second bearing seat.

5. The grab bucket driving device according to claim 4, characterized in that: The support shell includes a first support shell and a second support shell, the first support shell is fixedly connected to the second support shell, the first support shell includes a first enclosure plate for enclosing around the support shaft and a first top cover connected to the top edge of the enclosure plate, and the outer ring of the first bearing seat abuts against the inner wall of the first top cover.

6. The grab bucket driving device according to claim 5, characterized in that: The second support shell includes a second enclosure plate for enclosing around the support shaft and a bottom plate connected to the bottom edge of the second enclosure plate. The second enclosure plate is fixedly connected to the first enclosure plate. A third diverter pipe is formed in the radial direction of the second enclosure plate. The third diverter pipe is connected to the second diverter pipe. The outer ring of the second bearing seat abuts against the inner wall of the second enclosure plate.

7. The grab bucket driving device according to claim 6, characterized in that: The second diverter pipe includes a first docking section and a diverter section, the first docking section is arranged along the axial direction of the first diverter pipe, and the diverter section is arranged along the radial direction of the second diverter pipe, one end of the diverter section is connected to an end of the first docking section away from the first diverter pipe, and the other end of the diverter section is connected to the third diverter pipe.

8. The grab bucket driving device according to claim 2, characterized in that: The first flow diversion pipe includes a flow delivery section, a flow guide section and a second docking section. The flow delivery section connects the flow guide section with the external fluid of the flow guide member and extends along the radial direction of the flow guide member.

9. The grab bucket driving device according to claim 8, characterized in that: The flow guiding section extends along the length direction of the flow guiding member, and one end of the flow guiding section away from the flow conveying section is connected to the second docking section.

10. The grab bucket driving device according to claim 9, characterized in that: The second docking section extends along the radial direction of the flow guide, and one end of the second docking section away from the flow guide section is connected to the second diverter pipe.

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