Electric hydraulic multi-petal grab bucket

Abstract

The electric hydraulic multi-petal grab bucket comprises a grab bucket base, a hydraulic cabin, a main shaft rod, a control valve set and a hydraulic pump set used for controlling the grab bucket to work, a plurality of grab bucket petals and a driving rod are rotationally installed on the surface of the grab bucket base, the other end of the driving rod is movably connected with the surfaces of the grab bucket petals, and a plurality of plunger cavities are formed in the inner side of the grab bucket base; the control valve sets are arranged on the inner sides of the plunger cavities one by one, communicating pipes communicating with the plunger cavities are arranged on the surface of the driving rod, and a pressure release valve is arranged on the surface of the driving rod. According to the grab bucket, the novel rotary control valve body structure is arranged, the swash plate base is driven by the driving motor to rotate, then the multiple control valve sets are controlled to be opened and closed one by one, and each grab bucket petal can independently move according to the shape, size and resistance of materials by means of sequential control and progressive movement of the grab bucket petals; therefore, the operation flexibility is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic grab buckets, in particular to an electric hydraulic multi-petal grab bucket. Background Art

[0002] In the bulk cargo handling industry, electro-hydraulic multi-flap grabs are favored for their high efficiency and wide range of applications. Traditional electro-hydraulic multi-flap grabs usually rely on hydraulic pump stations to synchronously drive multiple cylinders to operate multiple grab flaps. However, this synchronous drive method has exposed a series of problems in practical applications.

[0003] First of all, the traditional synchronously driven electric hydraulic multi-flap grab has obvious deficiencies in operational flexibility. Since all the grab flaps move synchronously, they cannot be flexibly adjusted according to the shape, size and resistance of the grabbed material. Especially when handling materials with irregular shapes or large resistance, the synchronously driven grab flaps have different contact effects with the surface of the object, resulting in some grab flaps failing to effectively contact the surface of the object, and some grab flaps excessively contacting the surface of the object, resulting in extrusion damage to the object, and excessive contact resistance causing obstruction of the entire system, which seriously affects the grab efficiency and operational stability.

[0004] Secondly, the traditional synchronous drive method also has energy consumption and temperature rise problems. Since all grab petals move synchronously, the hydraulic system needs to maintain high pressure and flow during the grabbing process, which will lead to increased energy consumption and excessive temperature rise of the hydraulic system. Long-term high-load operation not only increases energy costs, but may also have an adverse effect on the stability and life of the hydraulic system, increase the complexity and difficulty of operation, and may also affect the grabbing efficiency and work safety. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted by the present invention is: an electric hydraulic multi-petal grab, comprising: a grab seat, a hydraulic cabin, a main shaft rod and a control valve group and a hydraulic pump group for controlling the operation of the grab, a plurality of grab petals and a driving rod are rotatably installed on the surface of the grab seat, the other end of the driving rod is movably connected with the surface of the grab petal, a plurality of plunger cavities are arranged on the inner side of the grab seat, and the control valve group is arranged one by one on the inner side of each plunger cavity, a connecting pipe communicating with the plunger cavity is arranged on the surface of the driving rod, and a pressure relief valve is arranged on the surface of the driving rod, the hydraulic cabin is fixedly installed on the top surface of the grab seat and a connecting hole is opened on the surface of the hydraulic cabin, a driving motor is fixedly installed on the top surface of the hydraulic cabin, the output end of the driving motor is fixedly connected with the top end of the main shaft rod, the main shaft rod is rotatably installed on the inner side of the hydraulic cabin and a retaining ring and a sliding ring slidably abutting against the bottom surface of the retaining ring are rotatably installed on the bottom surface; The control valve group includes a plunger valve cylinder, a return spring and a valve plug seat fixed inside the plunger cavity, the top surface of the valve plug seat is provided with a second valve hole connected to the plunger cavity, the surface of the plunger valve cylinder is provided with a first valve hole connected to the inner cavity of the hydraulic cabin, the return spring is sleeved on the outside of the plunger valve cylinder and the bottom end abuts against the surface of the grab seat, the interiors of the plunger valve cylinder and the valve plug seat are respectively provided with a first one-way valve core and a second one-way valve core, the top surface of the plunger valve cylinder is provided with a ball that slides against the bottom surface of the sliding ring, the first one-way valve core and the second one-way valve core are used for one-way outlet of the oil inside the plunger valve cylinder and the valve plug seat, and the outlet directions are the same.

[0007] In a preferred example, the present invention can be further configured as follows: the grab bucket petals and driving rods are in a plurality and are evenly distributed on the periphery of the grab bucket seat in a circumferential direction, and the plunger cavity and the connecting pipe are arranged in a one-to-one correspondence with the driving rod.

[0008] In a preferred example, the present invention can be further configured as follows: the pressure relief valve is an adjustable pressure valve structure, which is used to release the oil inside the pressure relief valve.

[0009] In a preferred example, the present invention can be further configured as follows: a mechanical seal sleeved on the surface of the main shaft is fixedly installed on the inner side of the hydraulic cabin, a connecting hole for connecting with the hydraulic pump group is opened on the surface of the hydraulic cabin, and the bottom end of the hydraulic cabin is fixedly connected to the top surface of the grab seat.

[0010] In a preferred example, the present invention can be further configured as follows: the slip ring is rotatably mounted on the bottom surface of the swash plate seat through a retaining ring, the swash plate seat and the slip ring are arranged obliquely, and the main shaft rod and the grab seat are located on the same axial line.

[0011] In a preferred example, the present invention can be further configured as follows: the top end of the plunger valve cylinder is in sliding contact with the bottom surface of the sliding ring via the abutment bead.

[0012] In a preferred example, the present invention can be further configured as follows: the outer periphery of the plunger valve barrel slides in abutment with the inner side of the plunger cavity, the inner side of the plunger valve barrel is provided with a flow channel connected to the first valve hole, and the bottom end of the flow channel is connected to the interior of the plunger cavity, and the surface of the valve plug seat is provided with a valve hole connected to the connecting pipe port.

[0013] The beneficial effects achieved by the present invention are: 1. In the present invention, by setting a new type of rotary control valve body structure, the inclined plate seat is rotated under the drive of the driving motor to control the opening and closing of multiple control valve groups one by one. By sequentially controlling and progressively moving each grab bucket petal, each grab bucket petal can move independently according to the shape, size and resistance of the material, thereby improving the flexibility of operation.

[0014] 2. In the present invention, when faced with materials with irregular shapes or large resistance, the system can use the pressure relief valve to perform constant pressure control to release excess pressure inside each driving rod, thereby avoiding damage to the object caused by excessive squeezing of the object surface, and the progressive movement gradually closes the control to ensure that the material can be effectively grasped and transported.

[0015] 3. In the present invention, a multi-control valve group is used to perform reciprocating motion during the rotation of the swash plate seat, and the oil delivered by the hydraulic pump is pressurized by a secondary plunger to enter the interior of the drive rod, providing higher hydraulic delivery efficiency and further improving load strength. It is suitable for various material grabbing operations, and the flow channel is closed during the non-movement process of the plunger cavity to maintain a higher pressure to avoid excessive energy consumption caused by long-term load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 A schematic diagram of the decomposed structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the main shaft rod and grab bucket seat structure of an embodiment of the present invention; Figure 4 A schematic diagram of the cross-sectional structure of a grab bucket seat according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a control valve group according to an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a slant disc seat and a plunger valve cylinder according to an embodiment of the present invention; Figure 7 The figure is a schematic diagram of the cross-sectional structure of a control valve group according to an embodiment of the present invention.

[0017] Reference numerals: 100, grab seat; 110, grab flap; 120, drive rod; 130, plunger chamber; 121, connecting pipe; 122, pressure relief valve; 200, hydraulic compartment; 210, connecting hole; 220, driving motor; 300, main shaft rod; 310, inclined plate seat; 311, slip ring; 312, retaining ring; 400, control valve group; 410, plunger valve cylinder; 420, valve plug seat; 430, return spring; 411, stop ball; 412, first valve hole; 413, first one-way valve core; 421, second valve hole; 422, second one-way valve core. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0019] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0020] An electric hydraulic multi-petal grab provided by some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Combination Figure 1-7 As shown, the present invention provides an electro-hydraulic multi-petal grab, comprising: a grab seat 100, a hydraulic cabin 200, a main shaft rod 300, a control valve group 400 and a hydraulic pump group for controlling the operation of the grab, a plurality of grab petals 110 and a driving rod 120 are rotatably mounted on the surface of the grab seat 100, the other end of the driving rod 120 is movably connected to the surface of the grab petal 110, a plurality of plunger cavities 130 are arranged on the inner side of the grab seat 100, and the control valve group 400 is arranged one by one on the inner side of each plunger cavity 130, and the surface of the driving rod 120 is provided with a plurality of plunger cavities 130 and a plurality of plunger cavities 130. A connecting pipe 121 is connected to the plunger chamber 130, and a pressure relief valve 122 is provided on the surface of the driving rod 120. The hydraulic chamber 200 is fixedly installed on the top surface of the grab seat 100 and a connecting hole 210 is opened on the surface of the hydraulic chamber 200. A driving motor 220 is fixedly installed on the top surface of the hydraulic chamber 200. The output end of the driving motor 220 is fixedly connected to the top of the main shaft 300. The main shaft 300 is rotatably installed on the inner side of the hydraulic chamber 200 and a retaining ring 312 and a sliding ring 311 that slides against the bottom surface of the retaining ring 312 are rotatably installed on the bottom surface. The control valve group 400 includes a plunger valve cylinder 410, a return spring 430 and a valve plug seat 420 fixed inside the plunger cavity 130. The top surface of the valve plug seat 420 is provided with a second valve hole 421 connected to the plunger cavity 130. The surface of the plunger valve cylinder 410 is provided with a first valve hole 412 connected to the inner cavity of the hydraulic chamber 200. The return spring 430 is sleeved on the outer side of the plunger valve cylinder 410 and the bottom end is abutted against the surface of the grab seat 100. The interiors of the plunger valve cylinder 410 and the valve plug seat 420 are respectively provided with a first one-way valve core 413 and a second one-way valve core 422. The top surface of the plunger valve cylinder 410 is provided with a ball 411 that slides against the bottom surface of the sliding ring 311. The first one-way valve core 413 and the second one-way valve core 422 are used for one-way discharge of oil inside the plunger valve cylinder 410 and the valve plug seat 420, and the discharge directions are the same.

[0022] In this embodiment, there are a plurality of grab petals 110 and driving rods 120 which are evenly distributed on the outer circumference of the grab seat 100 in the circumferential direction, and the plunger cavity 130 and the connecting pipe 121 are arranged in one-to-one correspondence with the driving rods 120 .

[0023] In this embodiment, the pressure relief valve 122 is an adjustable pressure valve structure, which is used to release the oil inside the pressure relief valve 122 .

[0024] Specifically, the maximum pressure relief value of the pressure relief valve 122 is adjusted according to the properties of the material to avoid excessive internal hydraulic strength of the driving rod 120 causing damage to the surface of the object by the grab petal 110, and to avoid the pressure relief of the pressure relief valve 122 causing the internal hydraulic pressure of the driving rod 120 to be too low to grab the material.

[0025] In this embodiment, a mechanical seal sleeved on the surface of the main shaft rod 300 is fixedly installed on the inner side of the hydraulic cabin 200, and a connecting hole 210 for connecting with the hydraulic pump group is opened on the surface of the hydraulic cabin 200. The bottom end of the hydraulic cabin 200 is fixedly connected to the top surface of the grab seat 100.

[0026] In this embodiment, the slip ring 311 is rotatably mounted on the bottom surface of the swash plate seat 310 through the retaining ring 312. The swash plate seat 310 and the slip ring 311 are arranged obliquely, and the main shaft rod 300 and the grab bucket seat 100 are located on the same axis.

[0027] In this embodiment, the top end of the plunger valve cylinder 410 is in sliding contact with the bottom surface of the sliding ring 311 through the ball 411 .

[0028] Specifically, by rotating the swash plate seat 310 and under the reset control of the reset spring 430 , the abutment effect between the plunger valve cylinder 410 and the bottom surface of the abutment ring 311 is maintained, thereby achieving the reciprocating sliding of the plunger valve cylinder 410 inside the plunger cavity 130 .

[0029] In this embodiment, the outer periphery of the plunger valve cylinder 410 slides in abutment with the inner side of the plunger cavity 130, the inner side of the plunger valve cylinder 410 is provided with a flow channel connected to the first valve hole 412, and the bottom end of the flow channel is connected to the interior of the plunger cavity 130, and the surface of the valve plug seat 420 is provided with a valve hole connected to the port of the connecting pipe 121.

[0030] Specifically, the plunger valve cylinder 410 and the valve plug seat 420 control the one-way introduction of oil into the interior of the plunger cavity 130 and the valve plug seat 420 performs one-way extraction of oil in the plunger cavity 130 to prevent the oil from flowing in the opposite direction.

[0031] The working principle and use process of the present invention: When the electric hydraulic multi-petal grab is used, the output port of the hydraulic pump group is connected to the connecting hole 210 to introduce oil, and the maximum pressure relief value of the pressure relief valve 122 is adjusted according to the properties of the material to avoid excessive hydraulic strength inside the driving rod 120 causing damage to the surface of the object by the grab petal 110, and to avoid the pressure relief valve 122 causing the pressure inside the driving rod 120 to be too low to grab the material; During the operation of the hydraulic pump group, the oil is introduced and the internal hydraulic pressure of the grab seat 100 is increased. The main shaft rod 300 is rotated under the drive of the drive motor 220. During the rotation of the swash plate seat 310, the return spring 430 pushes and maintains the abutment effect between the plunger valve cylinder 410 and the bottom surface of the abutment ring 311. When the plunger valve cylinder 410 moves upward, the internal volume of the plunger cavity 130 increases and the internal pressure is less than the internal hydraulic pressure of the grab seat 100. The first one-way valve core 413 is used to introduce the internal oil of the grab seat 100 into the plunger cavity 130 in one direction, and the plunger valve cylinder 410 is pushed downward under the rotation of the swash plate seat 310, so that the internal oil of the plunger cavity 130 passes through the valve plug seat 42 0 is pushed out and guided to the inside of the driving rod 120 through the connecting pipe 121, so that the driving rod 120 is filled with oil to control the plunger chamber 130 to deflect and close, and the material is clamped until the hydraulic overload inside the driving rod 120 is greater than the set pressure relief value of the pressure relief valve 122, and overflows from the port of the pressure relief valve 122 and flows back to the hydraulic pump group. Under the drive of the driving motor 220, the swash plate seat 310 is rotated to control the opening and closing of multiple control valve groups 400 one by one, so that each driving rod 120 is filled in sequence and intermittently. By using the sequential control and progressive movement of each grab petal 110, each grab petal can move independently according to the shape, size and resistance of the material.

[0032] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electro-hydraulic multi-petal grab, characterized in that: include: A grab seat (100), a hydraulic compartment (200), a main shaft rod (300), a control valve group (400), and a hydraulic pump group for controlling the operation of the grab, wherein a plurality of grab petals (110) and a driving rod (120) are rotatably mounted on the surface of the grab seat (100), the other end of the driving rod (120) is movably connected to the surface of the grab petal (110), a plurality of plunger cavities (130) are provided on the inner side of the grab seat (100), and the control valve group (400) is arranged one by one on the inner side of each plunger cavity (130), a connecting pipe (121) communicating with the plunger cavity (130) is provided on the surface of the driving rod (120), and a pressure relief valve (122) is provided on the surface of the driving rod (120); The hydraulic chamber (200) is fixedly mounted on the top surface of the grab seat (100) and a connecting hole (210) is provided on the surface of the hydraulic chamber (200). A driving motor (220) is fixedly mounted on the top surface of the hydraulic chamber (200). The output end of the driving motor (220) is fixedly connected to the top end of the main shaft (300). The main shaft (300) is rotatably mounted on the inner side of the hydraulic chamber (200) and a retaining ring (312) and a sliding ring (311) slidably abutting against the bottom surface of the retaining ring (312) are rotatably mounted on the bottom surface. The control valve group (400) comprises a plunger valve cylinder (410), a return spring (430) and a valve plug seat (420) fixed inside a plunger cavity (130); the top surface of the valve plug seat (420) is provided with a second valve hole (421) communicating with the plunger cavity (130); the surface of the plunger valve cylinder (410) is provided with a first valve hole (412) communicating with the inner cavity of the hydraulic chamber (200); the return spring (430) is sleeved on the outside of the plunger valve cylinder (410) and the bottom end is connected to the gripper. The surface of the bucket seat (100) is abutted, and the interior of the plunger valve cylinder (410) and the valve plug seat (420) are respectively provided with a first one-way valve core (413) and a second one-way valve core (422), and the top surface of the plunger valve cylinder (410) is provided with a ball (411) that is slidably abutted with the bottom surface of the sliding ring (311), and the first one-way valve core (413) and the second one-way valve core (422) are used for one-way discharge of oil inside the plunger valve cylinder (410) and the valve plug seat (420), and the discharge directions are the same.

2. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: The grab bucket petals (110) and the driving rods (120) are present in a plurality and are evenly distributed in a circumferential direction on the outer circumference of the grab bucket seat (100), and the plunger cavity (130) and the connecting pipe (121) are arranged in a one-to-one correspondence with the driving rods (120).

3. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: The pressure relief valve (122) is an adjustable pressure valve structure, and is used to release oil inside the pressure relief valve (122).

4. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: A mechanical seal sleeved on the surface of the main shaft rod (300) is fixedly installed on the inner side of the hydraulic chamber (200), a connecting hole (210) for communicating with a hydraulic pump group is provided on the surface of the hydraulic chamber (200), and the bottom end of the hydraulic chamber (200) is fixedly connected to the top surface of the grab seat (100).

5. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: The slip ring (311) is rotatably mounted on the bottom surface of the swash plate seat (310) via a retaining ring (312); the swash plate seat (310) and the slip ring (311) are arranged obliquely, and the main shaft (300) and the grab bucket seat (100) are located on the same axis.

6. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: The top end of the plunger valve cylinder (410) is in sliding contact with the bottom surface of the sliding ring (311) via the contact bead (411).

7. The electro-hydraulic multi-petal grab bucket according to claim 1, characterized in that: The outer periphery of the plunger valve cylinder (410) slides in abutment with the inner side of the plunger cavity (130), the inner side of the plunger valve cylinder (410) is provided with a flow channel connected to the first valve hole (412), and the bottom end of the flow channel is connected to the interior of the plunger cavity (130), and the surface of the valve plug seat (420) is provided with a valve hole connected to the port of the connecting pipe (121).

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