Power supply device for a shovel bucket of a shovel excavator and method of use thereof

Abstract

The application discloses a power supply device for a bucket of an electric shovel excavator and a use method thereof. The power supply device is used for driving the opening and closing of a bucket door of the electric shovel excavator. The electric shovel excavator comprises an electric shovel boom, a driving bucket rod and a bucket. The electric shovel boom is provided with a driving gear. The driving bucket rod is provided with a rack which is engaged with the driving gear. The bucket is rotatably arranged at the end of the driving bucket rod. The power supply device comprises a driven gear which is rotatably arranged on the electric shovel boom and engaged with the driving gear. A connecting rod mechanism is connected with the driven gear and the bucket at two ends respectively. The connecting rod mechanism is driven by the driven gear to move along with the driving bucket rod. A control mechanism is connected with the bucket through an internal passage of the connecting rod mechanism and used for controlling the opening and closing of the bucket door. The power supply device can control the opening and closing of the bucket door.

Description

Technical Field

[0001] This invention belongs to the field of electric shovel excavators, and more specifically, relates to a power supply device for the bucket of an electric shovel excavator and its method of use. Background Technology

[0002] Currently, the vast majority of electric shovel buckets have no power supply, and the bucket door relies solely on gravity to open and close, resulting in violent door swaying, high noise, and low bucket stability.

[0003] However, if the control mechanism is added to control the opening and closing of the bucket gate, and the pipeline is directly pulled to the bucket, the long boom will cause interference between the pipeline and the electric shovel when it moves.

[0004] One type of electric shovel already on the market uses an articulated hydraulic bucket attachment. It consists of two rods through which piping runs to the bucket, providing power to the bucket and using a hydraulic cylinder to open and close the bucket door. While this articulated hydraulic bucket attachment solves the problem of the bucket door relying solely on gravity for opening and closing, the angle between the two rods is too small when the bucket is at its lowest point (see appendix). Figure 3 The pipeline is severely bent, which affects its lifespan. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a power supply device for the bucket of an electric shovel excavator and its usage method, which can realize the power supply for the bucket of the electric shovel and drive the opening and closing of the bucket door using actuators, thereby solving the problems of violent bucket door swing, high noise, and low bucket stability. At the same time, the increased number of rods can smooth the bending angle of the pipeline and improve the service life of the pipeline.

[0006] The present invention adopts the following technical solution: A power supply device for the bucket of an electric shovel excavator is provided for driving the opening and closing of the bucket door of the electric shovel excavator. The electric shovel excavator includes an electric shovel boom, a drive stick, and a bucket. The electric shovel boom is provided with a drive gear, the drive stick is provided with a rack that meshes with the drive gear, and the bucket is rotatably disposed at the end of the drive stick. The power supply device for the bucket of the electric shovel excavator includes: The driven gear is rotatably mounted on the boom of the electric shovel and meshes with the driving gear; The linkage mechanism includes three links, namely, link one, link two, and link three, which are hinged in sequence. Link one is fixedly connected to the driven gear, and link three is hinged to the end of the drive stick near the bucket. The control mechanism includes actuators and pipelines, which pass through the internal channels of lever one, lever two, and lever three in sequence and are connected to the bucket to independently drive the opening and closing of the bucket door.

[0007] Furthermore, the linkage mechanism includes: One end of the rod is fixed to the driven gear; Rod 2, one end of which is rotatably connected to the other end of rod 1; One end of rod three is rotatably connected to the other end of rod two, and the other end is rotatably connected to the end of the boom near the bucket; the pipeline passes through rod one, rod two and rod three in sequence and is connected to the electric shovel bucket.

[0008] Furthermore, the pitch circle diameter of the driven gear

[0009] Where d1 is the tip circle diameter of the drive gear, α and β are the acute angles formed by the stick and the horizontal plane when the stick moves to the two extreme positions, and α > β.

[0010] Furthermore, the swing range angle of the rod.

[0011] Where L is the length of the rack on the stick.

[0012] Furthermore, the length of the rod

[0013] Where γ is the obtuse angle between rod 1 and the horizontal plane when the bucket is at its highest extreme position.

[0014] Furthermore, the square of the sum of the lengths of rod two (L2) and rod three (L3) satisfies the following formula:

[0015] Wherein, when the stick moves to two extreme positions, the distance from the center of the connection between the stick and the stick to the center of the drive gear is l1 and l2, where l1 > l2.

[0016] The present invention also proposes a method for using a power supply device for the bucket of an electric shovel excavator, comprising: When the boom moves horizontally, the driving gear drives the driven gear to rotate. The driven gear rotates simultaneously with rod one and transmits the motion to rod two, causing it to move. Since the rotational speed at the hinge point between rod two and rod three is different from the speed at the hinge point after the boom moves horizontally, rod three rotates. When the boom rotates, the driving gear drives the driven gear to rotate. The driven gear rotates simultaneously with rod one. At this time, the rack on the boom only rotates around the driving gear. The boom and rod three rotate relative to each other, causing rod two to rotate in a circular arc. When the boom moves horizontally, the driving gear rotates and meshes with the driven gear, causing boom one to rotate by a corresponding angle. Then, the boom rotates around the driving gear and moves along the tangent of the driving gear. Boom three rotates relative to the boom. Due to the different speeds at the hinges of boom one and boom two, and boom two and boom three, it can move to the expected position. The control mechanism's piping moves along levers one, two, and three and controls the opening and closing of the bucket gate.

[0017] Beneficial effects The present invention provides a power supply device and method for the bucket of a large electric shovel excavator, which has the following advantages: (1) The pipeline can reach the bucket from the boom along rod one, rod two and rod three. Oil pipes or wires can be connected in the pipeline to drive the bucket door, realize direct control of the opening and closing of the bucket door, reduce the swing amplitude and noise of the bucket door, and make the bucket door more stable.

[0018] (2) Compared with electric shovels that use articulated hydraulic bucket attachments, the large electric shovel excavator bucket power supply device and method provided by the present invention can effectively increase the included angle at the articulation, avoid excessive bending of the pipeline, and extend the service life of the pipeline.

[0019] (3) If an additional rod is added to the boom of an electric shovel using an articulated hydraulic bucket attachment, the problem of the small included angle at the hinge of the two rods in the attachment device can be solved. However, this structure has the problem that in the three working conditions of the electric shovel bucket movement—translation, rotation, and telescoping—the sum of the lengths of the moving rods may not meet the radius of the boom's movement trajectory. The gear transmission mechanism added to the power supply device and method for the bucket of the large electric shovel excavator provided by this invention allows the fixed rod to rotate accordingly according to the angle of boom rotation, thus avoiding the above-mentioned problem. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the electric shovel excavator bucket power supply device according to an embodiment of the present invention; Figure 2 A schematic diagram of the gear transmission mechanism of the power supply device for the bucket of an electric shovel excavator. Figure 3 A schematic diagram showing the included angle of the electric shovel rod in a design using a hinged hydraulic bucket attachment; Figure 4 This is a schematic diagram of the angles of the electric shovel rods using a multi-rod pipeline device in the electric shovel excavator bucket power supply device according to an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the calculation of the driven gear diameter according to an embodiment of the present invention; Figure 6 This is a simplified diagram of the four-bar linkage position when the bucket is at its lowest position according to an embodiment of the present invention. Figure 7 This is a simplified diagram of the four-bar linkage position when the bucket is at its highest position according to an embodiment of the present invention. Figure 8 This is a diagram showing the motion trajectory of the multi-bar mechanism during the translation of the boom in an embodiment of the present invention. Figure 9 This is a diagram showing the motion trajectory of the multi-bar mechanism during the rotation of the boom in an embodiment of the present invention. Figure 10This is a diagram showing the motion trajectory of the multi-bar mechanism during the translation of the stick, according to an embodiment of the present invention.

[0021] In the diagram, 1 is the gear transmission mechanism, 2 is the multi-bar pipeline mechanism, 3 is the boom, 4 is the stick, 5 is the first rod, 6 is the first pin, 7 is the second rod, 8 is the second pin, 9 is the third rod, 10 is the third pin, 11 is the bearing, 12 is the short shaft, 13 is the driven gear, and 14 is the driving gear. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] refer to Figure 1-2 A power supply device and method for the bucket of a large electric shovel excavator, comprising a gear transmission mechanism 1 and a multi-bar pipeline mechanism 2. The gear transmission mechanism 1 includes a driving gear 14, a driven gear 13, a short shaft 12, and a bearing 11. The driving gear 14 is a gear on the electric shovel itself that drives the boom 4 to move. The driven gear 13 is connected to the boom 3 of the electric shovel via the short shaft 12 and meshes with the driving gear 14. The short shaft 12 is connected to the boom 3 via the bearing 11.

[0024] refer to Figure 1 The multi-bar pipe mechanism 2 includes a first bar 5, a second bar 7, a third bar 9, a first pin 6, a second pin 8, a third pin 10, and pipes. The first bar 5 is integrated with the driven gear 13. The third bar 9 is hinged to the electric shovel bucket rod 4 via the third pin 10. One end of the second bar 7 is hinged to the first bar 5 via the first pin 6, and the other end is hinged to the second bar 7 via the second pin 8. The pipes pass sequentially through the first bar 5, the second bar 7, and the third bar 9 to reach the position of the electric shovel bucket.

[0025] The control mechanism includes actuators and piping. The piping is connected to the bucket via an internal channel of a linkage mechanism and is used to control the opening and closing of the bucket door. Oil pipes or electrical wires may pass through the piping to connect the actuators and drive the bucket door.

[0026] refer to Figure 4 The drive gear 14 drives the rack on the stick 4 to move the stick 4. The third stick 9 moves and rotates under the action of the first stick 5 and the second stick 7. The drive gear 14 drives the driven gear 13 to rotate the first stick 5. The second stick 7 translates under the action of the first stick 5 and the third stick 9.

[0027] refer to Figure 5-7 To ensure the smooth and unobstructed movement of the multi-bar pipe mechanism 2 and to prevent interference with the electric shovel, the following rules should be followed when designing rod 5, rod 7, rod 9, and driven gear 13: Rule 1: As Figure 5 As shown, let the addendum circle diameter of the driving gear 14 be d1, the addendum circle diameter of the driven gear 13 be d2, and the acute angles formed by the two extreme positions of the stick 4 and the horizontal plane be α and β, respectively. From geometric relationships, the maximum diameter of the addendum circle of the driven gear 13 satisfies... Therefore, the tip circle diameter of the driven gear 13 should be smaller than [the required diameter]. Rule 2: As Figure 6-7 As shown, let the distances from the center of pin 310 to the center of drive gear 14 at the two extreme positions be l1 and l2. Since the length of stick 4 is relatively large compared to the diameter of drive gear 14, we can approximate l1 and l2 as the straight-line distance from the center of pin 310 to the point of tangency between the rack on stick 4 and drive gear 14. Let the length of rack on stick 4 be L, then L = l1 - l2. In fixed rule one, driven gear 13 can reach the position with the largest tooth tip circle diameter. Since the diameters of drive gear 14 and driven gear 13 are relatively large, we can approximate the gear tooth tip circle to be the same as the pitch circle, and thus have a gear transmission ratio. The gear and rack meshing transmission length is Given the swing range angle θ of rod 5 as 2πn²Δt, we can obtain... Based on Rule 1, the addendum circle diameter of driven gear 13 can be deduced that the swing range angle of rod 5 should be greater than [missing information]. Rule 3: Let γ be the obtuse angle between rod 5 and the horizontal plane when the bucket is at its highest extreme position. The length L1 of rod 5 should be greater than...

[0028] Rule 4: Link 2 (7) and Link 3 (9) should not be collinear during bucket movement, and the square of the sum of the lengths L2 and L3 of Link 2 (5) and Link 3 (9) should satisfy the following condition:

[0029] refer to Figure 8-9 The boom 4 has three working conditions during its movement: translation, rotation, and translational motion. The corresponding multi-bar pipe mechanism 2 will have the following situations: During the translation of the boom 4, the driving gear 14 drives the driven gear 13 to rotate. The driven gear 13 rotates simultaneously with the first rod 5 and transmits the motion trend to the second rod 7, causing it to move. Since the rotational speed at the hinge point between the second rod 7 and the third rod 9 is different from the speed at the hinge point between the boom 4 and the third rod 9 after translation, the third rod rotates. The motion is reasonable and exists.

[0030] During the rotation of the boom 4, the driving gear 14 drives the driven gear 13 to rotate. The driven gear 13 and rod 5 rotate simultaneously. At this time, the rack on the boom 4 only rotates around the driving gear 14. The boom 4 and rod 9 rotate relative to each other, causing rod 7 to rotate in a near-circular arc. The motion is reasonable and exists. If, according to the implementation method of adding a rod fixed to the boom using an electric shovel with an articulated hydraulic bucket attachment, rod 5 is fixed, simplifying the mechanism's motion, then the sum of the lengths of rod 7 and rod 9 is insufficient for the bucket to achieve complete motion. Figure 9 Curve A represents the expected trajectory of pin 3 (10), curve B represents the actual trajectory of pin 3 (10), and point a represents the limit position that pin 3 (10) can reach. The motion is unreasonable, therefore the gear transmission mechanism 1 is necessary. During the translational motion of the boom 4, the driving gear 14 rotates and meshes with the driven gear 13, causing rod 5 to rotate by a corresponding angle. The boom 4 then rotates around the driving gear 14 and moves along the tangent of the driving gear 14. Rod 3 (9) rotates relative to the boom 4. Due to the different speeds at the hinge points of rod 5 and rod 2 (7), and rod 2 (7) and rod 3 (9), it can move to the expected position. This motion is the normal motion during electric shovel digging, and it is reasonable and exists.

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power supply device for the bucket of an electric shovel excavator, used to drive the opening and closing of the bucket door of the electric shovel excavator, the electric shovel excavator including an electric shovel boom, a drive stick, and a bucket; the electric shovel boom is provided with a drive gear, the drive stick is provided with a rack meshing with the drive gear, and the bucket is rotatably disposed at the end of the drive stick; characterized in that, The electric shovel excavator bucket power supply device includes: The driven gear is rotatably mounted on the boom of the electric shovel and meshes with the driving gear; The linkage mechanism has a driven gear connected to the bucket at both ends, and is driven by the driven gear to follow the movement of the bucket stick. The control mechanism includes actuators and piping. The piping is connected to the bucket through the internal channel of the linkage mechanism and is used to control the opening and closing of the bucket door. The linkage mechanism includes: One end of the rod is fixed to the driven gear; Rod 2, one end of which is rotatably connected to the other end of rod 1; Rod three has one end rotatably connected to the other end of rod two, and the other end rotatably connected to the end of the stick near the bucket; The pipeline passes through rod one, rod two and rod three in sequence and connects to the electric shovel bucket.

2. The electric shovel excavator bucket power supply device according to claim 1, characterized in that, The diameter of the tip circle of the driven gear ; Where d1 is the tip circle diameter of the drive gear, α and β are the acute angles formed by the stick and the horizontal plane when the stick moves to the two extreme positions, and α > β.

3. The electric shovel excavator bucket power supply device according to claim 2, characterized in that, The swing range angle of the rod ; Where L is the length of the rack on the stick.

4. The electric shovel excavator bucket power supply device according to claim 3, characterized in that, Rod length ; Where γ is the obtuse angle between rod 1 and the horizontal plane when the bucket is at its highest extreme position.

5. The electric shovel excavator bucket power supply device according to claim 4, characterized in that, The square of the sum of the lengths of rod 2 (L2) and rod 3 (L3) satisfies the following formula: ； Wherein, when the stick moves to two extreme positions, the distance from the center of the connection between the stick and the stick to the center of the drive gear is l1 and l2, where l1 > l2.

6. A method of using the electric shovel excavator bucket power supply device as described in claim 5, characterized in that: include: When the boom moves horizontally, the driving gear drives the driven gear to rotate. The driven gear rotates simultaneously with rod one and transmits the motion to rod two, causing it to move. Since the rotational speed at the hinge point between rod two and rod three is different from the speed at the hinge point after the boom moves horizontally, rod three rotates. When the boom rotates, the driving gear drives the driven gear to rotate. The driven gear rotates simultaneously with rod one. At this time, the rack on the boom only rotates around the driving gear. The boom and rod three rotate relative to each other, causing rod two to rotate in a circular arc. When the boom moves horizontally, the driving gear rotates and meshes with the driven gear, causing boom one to rotate by a corresponding angle. Then, the boom rotates around the driving gear and moves along the tangent of the driving gear. Boom three rotates relative to the boom. Due to the different speeds at the hinges of boom one and boom two, and boom two and boom three, it can move to the expected position. The control mechanism's piping moves along levers one, two, and three and controls the opening and closing of the bucket gate.

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