A hydraulic linkage control device and method for a two-way rotating platform of an excavator

Abstract

This invention relates to the technical field of excavators, and more particularly to a hydraulic linkage control device and method for a two-way slewing platform of an excavator. It includes a lower chassis, a guide frame fixedly connected to the top of the chassis, a slewing platform movably connected to the top of the guide frame via a pivot, a boom connecting frame fixedly connected to the left side of the slewing platform, a hydraulic connecting rod fixedly connected to the top of the boom connecting frame, and an excavator bucket fixedly connected to the end of the hydraulic connecting rod furthest from the boom connecting frame. By setting up a dual-platform mechanism, the excavator's operational flexibility and adaptability to multiple working conditions are significantly improved. By setting up a hydraulic transmission mechanism, the stability of the machine's slewing operation is significantly improved. By setting up an active adjustment mechanism, the hydraulic power is matched with the excavation load. By setting up an auxiliary adjustment mechanism, the slewing platform is ensured to rotate smoothly and uniformly at extremely low speeds, meeting the requirements of high-precision positioning and fine excavation operations.

Description

Technical Field

[0001] This invention relates to the technical field of excavators, and more particularly to a hydraulic linkage control device and method for a two-way slewing platform of an excavator. Background Technology

[0002] Excavators are among the most common pieces of equipment in construction machinery, widely used in earthwork excavation, material handling, and other operations in fields such as construction, mining, and transportation. Traditional excavators typically employ a single slewing platform structure, where the boom, stick, bucket, and other working devices are mounted on the same slewing platform along with the cab. The platform is mounted on the undercarriage via a slewing bearing. During operation, the operator controls the slewing motor to rotate the entire upper body, thereby adjusting the digging direction.

[0003] Under certain working conditions, operators need to frequently adjust the orientation of the entire upper body, resulting in low work efficiency and high energy consumption. In addition, it is impossible to achieve an operating mode in which the cab remains in one orientation while the excavator arm rotates independently, which limits the flexibility and versatility of the excavator. Most existing slewing hydraulic systems use directional valves to directly control the start and stop of the hydraulic motor. When the oil circuit is cut off or opened instantly, the high-pressure hydraulic oil will generate a violent pressure shock and a sudden change in flow, resulting in obvious shaking and vibration of the platform.

[0004] Excavator digging resistance changes frequently during operation, but the oil supply of traditional slewing hydraulic systems is relatively fixed, making it impossible to compensate for or reduce the oil supply in real time according to changes in the actual load on the bucket. In scenarios requiring precision operations, the slewing platform must be able to rotate uniformly at extremely low speeds. However, under extremely low flow conditions, traditional hydraulic systems often experience creeping phenomena in the hydraulic motor due to factors such as nonlinear friction and oil compressibility, failing to achieve truly stable ultra-low-speed rotation and severely limiting the excavator's precision operation capabilities. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the current hydraulic linkage control device for a bidirectional slewing platform of an excavator, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a hydraulic linkage control device for a two-way slewing platform of an excavator, which aims to achieve smooth rotation, eliminate impact, and provide stepless adjustment.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an excavating mechanism, comprising a lower chassis, a guide frame fixedly connected to the top of the lower chassis, a slewing platform movably connected to the top of the guide frame via a pivot, a boom connecting frame fixedly connected to the left side of the slewing platform, a hydraulic connecting rod fixedly connected to the top of the boom connecting frame, an excavator bucket fixedly connected to the end of the hydraulic connecting rod away from the boom connecting frame, an upper platform provided on the top of the slewing platform, and an excavator cab fixedly connected to the top of the upper platform; characterized in that:

[0009] A dual-platform mechanism includes a hydraulic motor, the bottom of which is fixedly connected to the top of a guide frame. A hydraulic transmission shaft is fixedly connected to the output end of the hydraulic motor. A transmission fixing component is fixedly connected to the left side of the hydraulic transmission shaft. The left side of the transmission fixing component is fixedly connected to the left side of the inner wall of the rotary platform. A rotating linkage block is movably connected to the top of the hydraulic transmission shaft via a rotating shaft. The top of the rotating linkage block is fixedly connected to the bottom of the upper platform. A telescopic sleeve is movably fitted onto the surface of the rotating linkage block. The bottom of the telescopic sleeve contacts the top of the hydraulic transmission shaft. A block is fixedly connected to the bottom of the telescopic sleeve. Several blocks are provided and evenly distributed. The bottom of the blocks penetrates into the inner cavity of the hydraulic transmission shaft.

[0010] The hydraulic transmission mechanism is located on the top of the guide frame. The hydraulic transmission mechanism can assist the dual-platform mechanism in transmitting hydraulic oil volume and reduce mechanical vibration caused by hydraulic circuit switching during excavator rotation.

[0011] An active adjustment mechanism is located on the right side of the telescopic sleeve. This mechanism can adjust the opening of the hydraulic transmission mechanism and adjust the hydraulic oil volume by raising and lowering the sleeve. It compensates for the oil supply according to the actual load changes of the excavator bucket, thereby achieving further power adaptation and matching.

[0012] An auxiliary adjustment mechanism is provided within the active adjustment mechanism. This auxiliary adjustment mechanism can further optimize and improve the low-speed stability of the active adjustment mechanism, thus preventing crawling.

[0013] As a preferred embodiment of the hydraulic linkage control device for the excavator bidirectional slewing platform of the present invention, the hydraulic transmission mechanism includes a circuit pipe, which is disposed on the top of the guide fixing frame. The bottom of the surface of the circuit pipe is fixedly connected to the top of the guide fixing frame. A supply pipe is fixedly connected to the top of the circuit pipe, and a delivery pipe is fixedly connected to the right side of the supply pipe. The bottom and right side of the supply pipe are both connected to the circuit pipe and the delivery pipe. Pipes are provided at the bottom of the circuit pipe and the right side of the delivery pipe to communicate with the hydraulic motor.

[0014] As a preferred embodiment of the hydraulic linkage control device for the excavator's bidirectional slewing platform of the present invention, the active adjustment mechanism includes a locking slider, which is disposed on the right side of the top of the telescopic sleeve. The inner cavity of the telescopic sleeve has a locking groove corresponding to the sliding direction of the locking slider. The bottom of the locking slider extends through the inner cavity of the telescopic sleeve and engages with the locking groove. A rectangular plate is fixedly connected to the top of the locking slider, and a toothed plate is fixedly connected to the right side of the rectangular plate. Support rods are fixedly connected to the front and back ends of the top of the guide fixing frame. A support shaft is movably connected to the back end of the support rod via a rotating shaft. A gear rod is fixedly connected to the inner side of the support shaft. The left side of the gear rod meshes with the right side of the toothed plate. A central shaft is disposed at the bottom of the supply pipe. A shaft fixing plate is movably connected to the front and back ends of the surface of the central shaft via a rotating shaft. The top of the back end of the shaft fixing plate is fixedly connected to the front end of the supply pipe. The central shaft and the support shaft are connected by a transmission belt. A guide fixing frame is fixedly connected to the top of the guide fixing frame corresponding to the bottom of the supply pipe. A triangular plate is provided at the bottom of the triangular plate. A triangular plate is fixedly connected to both the front and back ends of the top of the bottom of the triangular plate. An adjusting rod is movably connected to the top of the inner cavity of the triangular plate via a rotating shaft. The front and back ends of the adjusting rod penetrate the front and back ends of the triangular plate. The adjusting rod and the central shaft are connected via a transmission belt. An adjusting gear is fixedly sleeved on the surface of the adjusting rod. An adjusting groove is fixedly connected to the top of the bottom of the triangular plate and to the inner side of the triangular plate. An adjusting rack is slidably connected to the inner cavity of the adjusting groove. The top of the adjusting rack penetrates the top of the adjusting groove. The right side of the adjusting rack meshes with the left side of the adjusting gear. An ejector is fixedly connected to the left side of the adjusting rack. A limit block is slidably connected to the right side of the ejector and to the position corresponding to the adjusting groove. The right side of the limit block is fixedly connected to the left side of the adjusting groove. A conveying adjusting plate is provided at the bottom of the inner wall of the conveying pipe. A conveying sealing plate is fixedly connected to the bottom of the conveying adjusting plate and to the position corresponding to the ejector. The bottom of the conveying sealing plate penetrates to the bottom of the conveying pipe and cooperates with the ejector.

[0015] As a preferred embodiment of the hydraulic linkage control device for the excavator's bidirectional slewing platform described in this invention, the auxiliary adjustment mechanism includes a rod fixing ring, the inner cavity of which is fixedly connected to the surface of the central shaft, an auxiliary adjustment plate fixedly connected to the right side of the rod fixing ring, a rubber component fixedly connected to the bottom left side of the auxiliary adjustment plate, a circuit adjustment plate provided on the right side of the inner wall of the circuit pipe, and a circuit sealing plate fixedly connected to the right side of the circuit adjustment plate at the position corresponding to the rubber component, the right side of the circuit sealing plate penetrating the right side of the circuit pipe and cooperating with the rubber component.

[0016] In a preferred embodiment of the hydraulic linkage control device for the excavator bidirectional slewing platform described in this invention, the distance between the rubber component and the circuit sealing plate is greater than the distance between the ejector component and the conveying sealing plate.

[0017] As a preferred embodiment of the hydraulic linkage control device for the excavator bidirectional slewing platform of the present invention, a control air rod is fixedly connected to the left side of the top of the telescopic sleeve, and the top of the control air rod is fixedly connected to the bottom of the upper platform.

[0018] As a preferred embodiment of the hydraulic linkage control device for the excavator bidirectional slewing platform of the present invention, a first spring rod is fixedly connected to the top of the bottom plate of the triangular plate and the right side of the corresponding adjusting groove, a first return spring is fixedly connected to the top of the inner cavity of the first spring rod, and the top of the first return spring is fixedly connected to the bottom of the conveying sealing plate.

[0019] As a preferred embodiment of the hydraulic linkage control device for the excavator bidirectional slewing platform of the present invention, a second spring rod is fixedly connected to the top of the guide fixing frame, a second return spring is fixedly connected to the left side of the inner cavity of the second spring rod, and the left side of the second return spring is fixedly connected to the right side of the circuit sealing plate.

[0020] In view of the problems existing in the current hydraulic linkage control method for a bidirectional slewing platform of an excavator, this invention is proposed.

[0021] Therefore, the purpose of this invention is to provide a hydraulic linkage control method for a two-way slewing platform of an excavator, the purpose of which is to provide stepless adjustment and to avoid crawling.

[0022] To solve the above-mentioned technical problems, the present invention provides the following technical solution: The first stage involves the telescopic sleeve being at its lowest position, with both platforms rotating synchronously at full speed to achieve maximum power output and meet the needs of rapid site relocation or heavy-duty rough work; the second stage involves the telescopic sleeve rising while maintaining a constant hydraulic oil volume, with both platforms rotating synchronously, achieving smooth separation when the telescopic sleeve reaches a critical value, avoiding impact and vibration; the third stage involves the telescopic sleeve rising to a high position, with the rotating platform independently rotating stably at low speed to achieve low-speed fine-tuning.

[0023] As a preferred embodiment of the hydraulic linkage control method for the excavator bidirectional slewing platform described in this invention, the method includes: in the third stage, establishing return oil back pressure through an auxiliary adjustment mechanism to avoid low-speed crawling of the hydraulic motor and ensure smooth and uniform rotation at extremely low speeds.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention, by setting up a dual-platform mechanism, utilizes a hydraulic transmission shaft, a rotating linkage block, and a telescopic sleeve with insert blocks to achieve mechanical clutch linkage, constructing a dual independent slewing structure for the slewing platform and the upper platform of the cab. It can realize two working modes: full-speed synchronous slewing of the two platforms and smooth independent slewing. It not only meets the requirements of heavy-load rapid site transfer operations, but also achieves fixed cab posture and individual fine-tuning of the excavating mechanism's steering, greatly improving the excavator's operational flexibility and multi-condition adaptability.

[0026] 2. This invention, by setting up a hydraulic transmission mechanism, forms a closed-loop hydraulic circuit with a return pipe, a supply pipe, and a delivery pipe, stably supplying and returning hydraulic oil to the hydraulic motor. This can smoothly complete the transmission of hydraulic oil volume, buffer the pressure impact at the moment of oil circuit switching, effectively reduce the mechanical vibration and platform shaking caused by hydraulic switching during the excavator's rotation, and significantly improve the stability of the machine's rotation operation.

[0027] 3. This invention sets up an active adjustment mechanism, which uses the lifting and lowering of the telescopic sleeve to drive the toothed plate, gear rod and multi-stage transmission components to control the opening degree of the conveying adjustment plate inside the conveying pipe. The hydraulic oil supply flow is adjusted according to the actual application of the excavator bucket, so as to achieve the matching of hydraulic power and excavation load, complete the stepless adjustment of hydraulic oil volume, take into account both heavy load high power output and light load fine operation, and reduce useless energy consumption.

[0028] 4. By setting up an auxiliary adjustment mechanism, the opening of the circuit adjustment plate in the circuit pipe is synchronously adjusted with the active adjustment mechanism to stably establish the hydraulic motor return oil back pressure, optimize the low-speed flow stability of the hydraulic oil circuit, effectively overcome the low-speed crawling defect, and ensure that the rotary platform rotates at a uniform and stable speed at extremely low speeds, meeting the requirements of high-precision positioning and fine excavation operations. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 A three-dimensional structural diagram of the guide fixing frame provided by the present invention.

[0032] Figure 3 A three-dimensional structural diagram of the hydraulic transmission shaft provided by the present invention.

[0033] Figure 4 This is a three-dimensional structural diagram of the rotating linkage block provided by the present invention.

[0034] Figure 5 A three-dimensional structural diagram of the telescopic sleeve provided by the present invention.

[0035] Figure 6 A three-dimensional structural diagram of the supply pipe provided by the present invention.

[0036] Figure 7 A three-dimensional structural diagram of the circuit tube provided by the present invention.

[0037] Figure 8 This is a three-dimensional structural diagram of the circuit adjustment plate provided by the present invention.

[0038] Figure 9 A three-dimensional structural schematic diagram of the first reset spring provided by the present invention.

[0039] Figure 10 A three-dimensional structural diagram of the triangular plate provided by the present invention.

[0040] Figure 11 This is a three-dimensional structural diagram of the ejector provided by the present invention. Detailed Implementation

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0044] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0045] Example 1

[0046] The excavating mechanism 100 includes a lower chassis 101. A guide frame 102 is fixedly connected to the top of the lower chassis 101. A slewing platform 103 is movably connected to the top of the guide frame 102 via a pivot. A boom connecting frame 104 is fixedly connected to the left side of the slewing platform 103. A hydraulic connecting rod 105 is fixedly connected to the top of the boom connecting frame 104. An excavator bucket 106 is fixedly connected to the end of the hydraulic connecting rod 105 away from the boom connecting frame 104. An upper platform 107 is provided on the top of the slewing platform 103. An excavator cab 108 is fixedly connected to the top of the upper platform 107.

[0047] One embodiment of this example is as follows: a dual-platform mechanism 200, which includes a hydraulic motor 201. The bottom of the hydraulic motor 201 is fixedly connected to the top of the guide fixing frame 102. The output end of the hydraulic motor 201 is fixedly connected to a hydraulic transmission shaft 202. A transmission fixing member 203 is fixedly connected to the left side of the hydraulic transmission shaft 202. The left side of the transmission fixing member 203 is fixedly connected to the left side of the inner wall of the rotary platform 103. A rotating linkage block 204 is movably connected to the top of the hydraulic transmission shaft 202 through a rotating shaft. The top of the rotating linkage block 204 is fixedly connected to the bottom of the upper platform 107. A telescopic sleeve 205 is movably sleeved on the surface of the rotating linkage block 204. The bottom of the telescopic sleeve 205 contacts the top of the hydraulic transmission shaft 202. An insert block 206 is fixedly connected to the bottom of the telescopic sleeve 205. Several insert blocks 206 are provided and are evenly distributed. The bottom of the insert block 206 penetrates into the inner cavity of the hydraulic transmission shaft 202.

[0048] The dual-platform mechanism 200 includes a hydraulic motor 201. The bottom of the hydraulic motor 201 is fixedly connected to the top of the guide frame 102. The output end of the hydraulic motor 201 is fixedly connected to a hydraulic transmission shaft 202 via a key. A transmission fixing component 203 is fixedly connected to the left side of the hydraulic transmission shaft 202 via bolts. The left side of the transmission fixing component 203 is fixedly connected to the left side of the inner wall of the rotary platform 103 via welding or bolts, thereby achieving rigid linkage between the hydraulic transmission shaft 202 and the rotary platform 103. The rotary platform 103, as the lower platform, rotates under the drive of the hydraulic motor 201. The top of the hydraulic transmission shaft 202 is movably connected to the rotary linkage block 204 through the thrust roller bearing. The rotary linkage block 204 is a stepped cylinder with a cavity at its lower end that mates with the top of the hydraulic transmission shaft 202. A wear-resistant copper sleeve is installed in the cavity. The top of the rotary linkage block 204 is fixedly connected to the bottom of the upper platform 107 by bolts, so that the upper platform 107 can rotate independently relative to the hydraulic transmission shaft 202.

[0049] A telescopic sleeve 205 is movably fitted onto the surface of the rotating linkage block 204. The telescopic sleeve 205 has a cylindrical structure, and its inner diameter slides into the outer diameter of the rotating linkage block 204. A guide groove is provided on its inner wall. The bottom end face of the telescopic sleeve 205 contacts the top end face of the hydraulic transmission shaft 202. An annular oil groove and a wear-resistant coating are machined on the contact surface. Insert blocks 206, made of high-strength alloy steel, are uniformly fixedly connected to the bottom end face of the telescopic sleeve 205 along the circumferential direction. Each insert block 206 is a cylindrical body with a conical or trapezoidal cross-section. The top end face of the hydraulic transmission shaft 202 has the same number of insertion holes at corresponding positions. The bottom of the insert block 206 penetrates into the insertion hole cavity of the hydraulic transmission shaft 202, forming a separable jaw-type meshing structure. When the telescopic sleeve 205 is in its lowest position… When the insert 206 is fully inserted into the insertion hole, the rotating linkage block 204 and the hydraulic transmission shaft 202 rotate synchronously. That is, the upper platform 107 and the rotary platform 103 are rigidly connected and rotate synchronously. When the telescopic sleeve 205 is lifted upward, the insert 206 gradually exits from the insertion hole. When it is completely disengaged, the mechanical connection between the upper platform 107 and the rotary platform 103 is broken. The left side of the top of the telescopic sleeve 205 is fixedly connected to the control rod 205a through the bracket. The control rod 205a is a single-acting cylinder or hydraulic cylinder. Its cylinder body is hinged to the telescopic sleeve 205 through the lug seat. The top of its piston rod is fixedly connected to the bottom of the upper platform 107, thereby driving the telescopic sleeve 205 to move up and down relative to the rotating linkage block 204, corresponding to the stroke of the insert 206 from fully engaged to fully disengaged.

[0050] By setting up a dual-platform mechanism 200, the mechanical engagement and disengagement between the upper platform 107 and the slewing platform 103, as well as the synchronous control between the two, can be realized. This solves the problem that existing excavators must have their cab and excavator arm rotate synchronously, resulting in poor operational flexibility and the inability to achieve multi-directional independent operation in narrow spaces.

[0051] Example 2

[0052] Based on Embodiment 1, this embodiment takes into account that since the oil supply of the hydraulic motor 201 cannot change continuously with position, the double platform still experiences sudden speed changes and hydraulic shocks due to the opening and closing of the oil circuit during engagement or disengagement, which affects the smoothness of operation and lifespan. Therefore, this embodiment provides a hydraulic transmission mechanism 300, which includes a circuit pipe 301. The circuit pipe 301 is located on the top of the guide fixing frame 102. The bottom of the surface of the circuit pipe 301 is fixedly connected to the top of the guide fixing frame 102. A supply pipe 302 is fixedly connected to the top of the circuit pipe 301. A delivery pipe 303 is fixedly connected to the right side of the supply pipe 302. The bottom and right side of the supply pipe 302 are connected to the circuit pipe 301 and the delivery pipe 303. Pipes are provided at the bottom of the circuit pipe 301 and the right side of the delivery pipe 303 to connect to the hydraulic motor 201.

[0053] The hydraulic transmission mechanism 300 includes a return pipe 301, which is arranged on top of the guide fixing frame 102. The return pipe 301 has a circular cross-section. The bottom surface of the return pipe 301 is fixedly connected to the top of the guide fixing frame 102 by welding or bolts. A vertically upward interface is provided at the center of the top of the return pipe 301, through which a supply pipe 302 is fixedly connected. The supply pipe 302 is a vertically oriented circular pipe, with its lower end communicating with the inner cavity of the return pipe 301 and its upper end closed. A circular through hole is opened in the middle of the right side wall of the supply pipe 302, through which a conveying pipe 303 is sealed and fixedly connected. The conveying pipe 303 is... A horizontally oriented circular pipe has its left end connected to the inner cavity of the supply pipe 302, and its right end connected to the oil inlet of the hydraulic motor 201 via a hydraulic hose. A through hole is also provided at the center of the bottom of the return pipe 301, which is connected to the oil return port of the hydraulic motor 201 through the through hole and the pipe, forming a complete hydraulic circuit. By setting a hydraulic transmission mechanism 300, when the telescopic sleeve 205 is raised or lowered, the active adjustment mechanism 400 drives the conveying sealing plate 419 and the conveying adjustment plate 418 to rise and fall synchronously, continuously changing the oil inlet flow area of ​​the conveying pipe 303, so that the amount of oil entering the hydraulic motor 201 changes linearly with the position of the telescopic sleeve 205.

[0054] Example 3

[0055] Based on Embodiment 2, this embodiment considers that while the hydraulic transmission mechanism 300 in Embodiment 2 can achieve physical connection and basic routing of the hydraulic oil circuit, its oil volume adjustment relies on external manual or simple mechanical control. It cannot continuously and stably adjust the oil intake proportionally according to the precise position of the telescopic sleeve 205, nor can it respond to the dynamic power output demands of the excavator bucket 106 during operation due to load changes. This results in insufficient power under heavy loads and energy waste under light loads. Therefore, this embodiment provides an active adjustment mechanism 400, which includes a fitting slider 401. The fitting slider 401 is located on the right side of the top of the telescopic sleeve 205, within the inner cavity of the telescopic sleeve 205, corresponding to the sliding direction of the fitting slider 401. A fitting groove 402 is provided, and the bottom of the fitting slider 401 extends through the inner cavity of the telescopic sleeve 205 to cooperate with the fitting groove 402. A rectangular plate 403 is fixedly connected to the top of the fitting slider 401, and a toothed plate 404 is fixedly connected to the right side of the rectangular plate 403. A support rod 405 is fixedly connected to the front and back ends of the top of the guide fixing frame 102. A support shaft 406 is movably connected to the back end of the support rod 405 through a rotating shaft. A gear rod 407 is fixedly connected to the inner side of the support shaft 406. The left side of the gear rod 407 and the right side of the toothed plate 404 are meshed. A central shaft 408 is provided at the bottom of the supply pipe 302. A shaft fixing plate 409 is movably connected to the front and back ends of the surface of the central shaft 408 through a rotating shaft. The top of the end and the front end of the supply pipe 302 are fixedly connected. The central shaft 408 and the support shaft 406 are connected by a transmission belt. A triangular bottom plate 410 is fixedly connected to the top of the guide fixing frame 102 and the bottom of the corresponding conveying pipe 303. Triangular plates 411 are fixedly connected to the front and back ends of the top of the triangular bottom plate 410. An adjusting rod 412 is movably connected to the top of the inner cavity of the triangular plate 411 through a rotating shaft. The front and back ends of the adjusting rod 412 pass through the front and back ends of the triangular plate 411. The adjusting rod 412 and the central shaft 408 are connected by a transmission belt. An adjusting gear 413 is fixedly sleeved on the surface of the adjusting rod 412. An adjusting groove 414 is fixedly connected to the top of the triangular bottom plate 410 and the inner side of the corresponding triangular plate 411. An adjusting rack 415 is slidably connected to the inner cavity of the slide 414. The top of the adjusting rack 415 passes through the top of the adjusting slide 414. The right side of the adjusting rack 415 is meshed with the left side of the adjusting gear 413. An ejector 416 is fixedly connected to the left side of the adjusting rack 415. A limit block 417 is slidably connected to the right side of the ejector 416 and at the position corresponding to the adjusting slide 414. The right side of the limit block 417 is fixedly connected to the left side of the adjusting slide 414. A conveying adjusting plate 418 is provided at the bottom of the inner wall of the conveying pipe 303. A conveying sealing plate 419 is fixedly connected to the bottom of the conveying adjusting plate 418 and at the position corresponding to the ejector 416. The bottom of the conveying sealing plate 419 passes through to the bottom of the conveying pipe 303 and works in conjunction with the ejector 416.

[0056] The active adjustment mechanism 400 includes a locking slider 401, which is a rectangular block. The locking slider 401 is located on the right side of the top of the telescopic sleeve 205. The locking slider 401 slides in the groove. The inner cavity of the telescopic sleeve 205 is provided with a locking groove 402 corresponding to the sliding direction of the locking slider 401. The locking groove 402 is a circular horizontal groove. The bottom of the locking slider 401 extends through the inner cavity of the telescopic sleeve 205. Its bottom protrusion forms a sliding fit with the locking groove 402 to ensure that the locking slider 401 can only slide horizontally along the locking groove 402.

[0057] A rectangular plate 403 is fixedly connected to the top of the interlocking slider 401 by welding or bolts. The rectangular plate 403 is a horizontally arranged steel plate. A toothed plate 404 is fixedly connected to the right side of the rectangular plate 403 by bolts or welding. A straight toothed rack is machined on the right side of the toothed plate 404. The length of the toothed plate 404 also corresponds to the lifting stroke of the telescopic sleeve 205 to ensure full engagement. Support rods 405 are fixedly connected to the front and back ends of the top of the guide fixing frame 102. The support rod 405 is a vertical column. Its bottom is fixed to the guide fixing frame 102 by bolts. A bearing seat is provided at the top. A support shaft 406 is movably connected to the inner side of the support rod 405 by ball bearings. A gear rod 407 is fixedly connected to the inner side of the support shaft 406. The gear rod 407 is a cylindrical gear. The left side of the gear rod 407 is meshed with the right side of the toothed plate 404. When the toothed plate 404 rises and falls with the telescopic sleeve 205, it drives the gear rod 407 to rotate.

[0058] A central shaft 408 is provided at the bottom of the supply pipe 302. The central shaft 408 is a horizontal shaft, and its axis is parallel to the support shaft 406. The front and back ends of the surface of the central shaft 408 are movably connected to the shaft fixing plate 409 through ball bearings. The top of its back end is fixedly connected to the front end of the supply pipe 302 by bolts, so that the central shaft 408 is suspended below the supply pipe 302. The central shaft 408 and the support shaft 406 are connected by a transmission belt. A triangular bottom plate 410 is fixedly connected to the top of the guide fixing frame 102 and to the bottom of the delivery pipe 303. The triangular bottom plate 410 is a horizontal steel plate and is fixed to the guide fixing frame 102 by bolts. A triangular plate 411 is fixedly connected to the front and back ends of the top of the triangular bottom plate 410. The triangular plate 411 is a triangular support plate, and its bottom is welded to the triangular bottom plate 410. Its top is provided with a bearing hole. The inner cavity of the triangular plate 411... An adjusting rod 412 is movably connected to the top via a ball bearing. The adjusting rod 412 is a horizontal shaft, with its front and back ends penetrating the front and back ends of the triangular plate 411 and extending out a certain length. The adjusting rod 412 and the central shaft 408 are connected via a transmission belt. An adjusting gear 413 is fixedly sleeved on the surface of the adjusting rod 412. The adjusting gear 413 is a cylindrical spur gear located between the two triangular plates 411. An adjusting groove 414 is fixedly connected to the top of the bottom plate 410 of the triangular plate and to the inner side of the triangular plate 411. Its bottom is welded to the bottom plate 410 of the triangular plate. An adjusting rack 415 is slidably connected to the inner cavity of the adjusting groove 414. The adjusting rack 415 is long and slides in cooperation with the guide groove in the adjusting groove 414. The top of the adjusting rack 415 penetrates the top of the adjusting groove 414. A straight tooth is machined on the right side of the adjusting rack 415, which meshes with the left side of the adjusting gear 413.

[0059] When the adjusting gear 413 rotates, it drives the adjusting rack 415 to move left and right along the adjusting slide 414. An ejector 416 is fixedly connected to the left side of the adjusting rack 415. The ejector 416 is a horizontal rod or block shape, with a spherical surface machined on its left end to smoothly contact the bottom of the conveying sealing plate 419. A limit block 417 is slidably connected to the right side of the ejector 416, corresponding to the position of the adjusting slide 414. The limit block 417 is a rectangular block, and its right side and the left side of the adjusting slide 414 are fixedly connected by bolts. A guide hole is provided in the middle of the limit block 417, through which the ejector 416 passes, thus restricting the ejector 416 to move only in a straight line left and right, preventing swaying. A conveying adjusting plate 418 is provided at the bottom of the inner wall of the conveying pipe 303. The conveying regulating plate 418 is shaped to match the cross-section of the inner cavity of the conveying pipe 303. A conveying sealing plate 419 is fixedly connected to the bottom of the conveying regulating plate 418 and the position corresponding to the ejector 416. A through hole with the same cross-sectional shape as the conveying sealing plate 419 is opened at the bottom of the conveying pipe 303 to allow the conveying sealing plate 419 to slide up and down without leaking hydraulic oil. The bottom of the conveying sealing plate 419 extends to the bottom of the conveying pipe 303. The bottom end face of the conveying sealing plate 419 is used in conjunction with the left end face of the ejector 416. When the ejector 416 moves left and right, the inclined or spherical surface of its left end face pushes the conveying sealing plate 419 to move up or down, thereby driving the conveying regulating plate 418 to rise and fall, changing the effective flow area of ​​the conveying pipe 303.

[0060] By setting an active adjustment mechanism 400, a precise mechanical proportional linkage function between the lifting and lowering of the telescopic sleeve 205 and the opening of the oil inlet throttle port of the conveying pipe 303 is realized. When the telescopic sleeve 205 is lifted and lowered, the fitting slider 401 slides relative to the fitting groove 402, driving the rectangular plate 403 and the toothed plate 404 to lift and lower synchronously. The toothed plate 404 drives the gear rod 407 to rotate. Through the transmission of the support shaft 406, transmission belt, central shaft rod 408, adjusting rod 412 and adjusting gear 413, the rotational motion is transmitted to the adjusting rack 415, causing the adjusting rack 415 to move left and right. The adjusting rack 415 drives the ejector 416 to move left and right. The ejector 416 pushes the conveying sealing plate 419 and the conveying adjusting plate 418 to lift and lower, thereby continuously and proportionally changing the effective flow area of ​​the conveying pipe 303.

[0061] Example 4

[0062] Based on Embodiment 3, this embodiment considers that the active adjustment mechanism 400 in Embodiment 3 can achieve precise proportional adjustment of the oil supply, so that the telescopic sleeve 205 corresponds to different oil supply at different positions. However, in the third stage, since the oil supply has been reduced to a minimum value, the hydraulic motor 201 is prone to creeping at extremely low speed. Therefore, this embodiment sets up an auxiliary adjustment mechanism 500. The auxiliary adjustment mechanism 500 includes a rod fixing ring 501. The inner cavity of the rod fixing ring 501 is fixedly connected to the surface of the central shaft 408. An auxiliary adjustment plate 502 is fixedly connected to the right side of the rod fixing ring 501. A rubber part 503 is fixedly connected to the bottom left side of the auxiliary adjustment plate 502. A circuit adjustment plate 504 is provided on the right side of the inner wall of the circuit pipe 301. A circuit sealing plate 505 is fixedly connected to the right side of the circuit adjustment plate 504 and at the position corresponding to the rubber part 503. The right side of the circuit sealing plate 505 passes through the right side of the circuit pipe 301 and cooperates with the rubber part 503.

[0063] The auxiliary adjustment mechanism 500 includes a rod fixing ring 501, the inner hole of which is fixedly connected to the outer diameter of the central shaft 408. An auxiliary adjustment plate 502 is fixedly connected to the right side of the rod fixing ring 501 by welding or integral molding. The auxiliary adjustment plate 502 is a horizontally extending plate-shaped component, its length direction extending to the right along the radial direction of the central shaft 408. The auxiliary adjustment plate 502 can swing in an arc around the axis of the central shaft 408 as the central shaft 408 rotates. Under the drive of the active adjustment mechanism 400, the central shaft 408 will rotate a certain angle as the telescopic sleeve 205 rises and falls.

[0064] A rubber component 503 is fixedly connected to the bottom left side of the auxiliary adjustment plate 502. The rubber component 503 is a block made of elastic material. When the auxiliary adjustment plate 502 swings to a certain angle, the rubber component 503 will press against the circuit sealing plate 505, thereby pushing the circuit adjustment plate 504 to move. During the contact process, the elasticity of the rubber absorbs the impact energy. The circuit adjustment plate 504 is provided on the right side of the inner wall of the circuit pipe 301. The circuit adjustment plate 504 is flat and its shape matches the cross-section of the inner cavity of the circuit pipe 301. The circuit adjustment plate 504 can slide left and right in the inner cavity of the circuit pipe 301. A guide groove or guide boss is processed on the right side of the inner wall of the circuit pipe 301 to restrict the circuit adjustment plate 504 to only move to the left along the axis and not rotate. The initial position of the circuit adjustment plate 504 is held on the rightmost side by the second return spring 102b.

[0065] A second spring rod 102a is also fixedly connected to the top of the guide fixing frame 102. The second spring rod 102a is a horizontally arranged hollow cylindrical tube. A second reset spring 102b is fixedly connected to the left side of the inner cavity of the second spring rod 102a. The second reset spring 102b is a compression helical spring. Its right end is fixedly connected to the right end face of the circuit sealing plate 505. When the circuit sealing plate 505 is pushed to the left by the rubber part 503, the second reset spring 102b is compressed. When the rubber part 503 retracts to the right, the second reset spring 102b pushes the circuit sealing plate 505 back to the initial position, thereby driving the circuit adjustment plate 504 to reset and restore the maximum flow area of ​​the circuit pipe 301. By setting the auxiliary adjustment mechanism 500, the function of automatically establishing the return oil back pressure to eliminate the creep phenomenon is realized in the third stage, the low-speed fine adjustment stage of the lower platform.

[0066] The distance between the rubber part 503 and the circuit sealing plate 505 is greater than the distance between the ejector part 416 and the conveying sealing plate 419;

[0067] When the telescopic sleeve 205 rises from its lowest position, the ejector 416 first contacts the conveying sealing plate 419, pushing the conveying adjusting plate 418 upward and beginning to reduce the oil inlet flow area of ​​the conveying pipe 303. At this time, the rubber part 503 has not yet contacted the circuit sealing plate 505, and the circuit pipe 301 remains fully open to ensure smooth oil return and not affect the system response speed. As the telescopic sleeve 205 continues to rise, the ejector 416 has completely lifted the conveying sealing plate 419, that is, the oil inlet has been adjusted to a smaller value. Only then does the rubber part 503 begin to contact the circuit sealing plate 505, pushing the circuit adjusting plate 504 to the left, gradually reducing the flow area of ​​the circuit pipe 301 and establishing the oil return back pressure. This delayed intervention ensures that the back pressure only takes effect when the oil inlet has been reduced to the point where low-speed fine adjustment is required, avoiding unnecessary increase in oil return resistance at high speed.

[0068] First stage: Insert block 206 is fully engaged with the insertion hole, rotating linkage block 204 is rigidly connected to hydraulic transmission shaft 202, upper platform 107 and rotary platform 103 rotate synchronously, ejector 416 does not contact conveying sealing plate 419, conveying adjusting plate 418 is at its lowest position under the action of first return spring 410b, rubber part 503 maintains a distance from circuit sealing plate 505, circuit adjusting plate 504 is at the rightmost position under the action of second return spring 102b, supply pipe 302 and conveying pipe 303 are fully open, hydraulic oil enters the oil inlet of hydraulic motor 201 through conveying pipe 303 at maximum flow rate, at the same time the circuit pipe 301 is fully open, oil return is smooth, hydraulic motor 201 obtains maximum oil supply, outputs maximum torque and speed;

[0069] Second stage: The telescopic sleeve 205 gradually rises from the lowest position to the critical position where the insertion block 206 is about to completely disengage from the insertion hole. The control rod 205a extends and pushes the telescopic sleeve 205 upward. The insertion block 206 gradually exits from the insertion hole. The mechanical meshing stiffness between the upper platform 107 and the rotary platform 103 gradually decreases, but still maintains synchronous rotation. When the telescopic sleeve 205 rises to the critical point, the insertion block 206 is about to completely disengage.

[0070] The third stage: The telescopic sleeve 205 completely disengages from the insert block and continues to rise to the highest position. The insert block 206 completely disengages from the insertion hole. The upper platform 107 has no mechanical connection with the hydraulic transmission shaft 202 and stops rotating. The rotary platform 103, as the lower platform, is driven by the hydraulic motor 201 and rotates independently. When the telescopic sleeve 205 rises to the last stroke near the highest position, the rubber part 503 begins to contact the circuit sealing plate 505. As the central shaft 408 continues to rotate, the auxiliary adjusting plate 502 swings, and the rubber part 503 gradually presses against the circuit sealing plate 505, pushing the circuit adjusting plate 504 to the left. This overcomes the elastic force of the second return spring 102b, and the effective flow area of ​​the circuit pipe 301 gradually decreases. A stable back pressure is established on the return oil side of the hydraulic motor 201. When the telescopic sleeve 205 reaches the highest position, the rubber part 503 is compressed to the maximum, the circuit adjusting plate 504 is in the leftmost position, and the return oil back pressure reaches its maximum value, achieving low-speed fine adjustment of the excavator rod and effectively suppressing the crawling phenomenon.

[0071] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible without substantially departing from the novelty and advantages of the subject matter described in this application. For example, variations in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​such as temperature, pressure, etc., installation arrangements, use of materials, color, orientation, etc. For instance, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure performing the function described herein, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0072] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments may be omitted, i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hydraulic linkage control device for a bidirectional slewing platform of an excavator, comprising an excavating mechanism (100), including a lower chassis (101), a guide frame (102) fixedly connected to the top of the lower chassis (101), a slewing platform (103) movably connected to the top of the guide frame (102) via a pivot shaft, a boom connecting frame (104) fixedly connected to the left side of the slewing platform (103), a hydraulic connecting rod (105) fixedly connected to the top of the boom connecting frame (104), an excavator bucket (106) fixedly connected to the end of the hydraulic connecting rod (105) away from the boom connecting frame (104), an upper platform (107) provided on the top of the slewing platform (103), and an excavator cab (108) fixedly connected to the top of the upper platform (107); characterized in that: The dual-platform mechanism (200) includes a hydraulic motor (201), the bottom of which is fixedly connected to the top of a guide frame (102). A hydraulic transmission shaft (202) is fixedly connected to the output end of the hydraulic motor (201). A transmission fixing component (203) is fixedly connected to the left side of the hydraulic transmission shaft (202). The left side of the transmission fixing component (203) is fixedly connected to the left side of the inner wall of the rotary platform (103). The top of the hydraulic transmission shaft (202) is movably connected via a rotating shaft. A rotating linkage block (204) is fixedly connected to the top of the upper platform (107). A telescopic sleeve (205) is movably sleeved on the surface of the rotating linkage block (204). The bottom of the telescopic sleeve (205) contacts the top of the hydraulic transmission shaft (202). A plug (206) is fixedly connected to the bottom of the telescopic sleeve (205). Several plugs (206) are provided and are evenly distributed. The bottom of the plugs (206) penetrates into the inner cavity of the hydraulic transmission shaft (202). The hydraulic transmission mechanism (300) is located on the top of the guide frame (102). The hydraulic transmission mechanism (300) can assist the dual platform mechanism (200) in transmitting hydraulic oil volume and preventing mechanical vibration caused by hydraulic circuit switching during excavator rotation. An active adjustment mechanism (400) is provided on the right side of the telescopic sleeve (205). The active adjustment mechanism (400) can adjust the opening of the hydraulic transmission mechanism (300), and adjust the hydraulic oil volume by lifting and lowering. It can compensate for the oil supply according to the actual load change of the excavator bucket, and achieve further power adaptation and matching. An auxiliary adjustment mechanism (500) is provided inside the active adjustment mechanism (400). The auxiliary adjustment mechanism (500) can further optimize and improve the low-speed stability of the active adjustment mechanism (400) and avoid crawling.

2. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 1, characterized in that: The hydraulic transmission mechanism (300) includes a return pipe (301), which is disposed on the top of the guide fixing frame (102). The bottom of the surface of the return pipe (301) is fixedly connected to the top of the guide fixing frame (102). A supply pipe (302) is fixedly connected to the top of the return pipe (301). A delivery pipe (303) is fixedly connected to the right side of the supply pipe (302). The bottom and right side of the supply pipe (302) are connected to the return pipe (301) and the delivery pipe (303). Pipes are provided at the bottom of the return pipe (301) and the right side of the delivery pipe (303) to connect to the hydraulic motor (201).

3. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 2, characterized in that: The active adjustment mechanism (400) includes a fitting slider (401), which is located on the right side of the top of the telescopic sleeve (205). The inner cavity of the telescopic sleeve (205) has a fitting groove (402) corresponding to the sliding direction of the fitting slider (401). The bottom of the fitting slider (401) extends through the inner cavity of the telescopic sleeve (205) to engage with the fitting groove (402). A rectangular plate (403) is fixedly connected to the top of the fitting slider (401), and a toothed plate (404) is fixedly connected to the right side of the rectangular plate (403). Support rods (405) are fixedly connected to the front and back ends of the top of the guide fixing frame (102). The back end of the support rod (405) is movably connected via a rotating shaft. A support shaft (406) is connected to the inside of the support shaft (406), and a gear rod (407) is fixedly connected to the inside of the gear rod (407). The left side of the gear rod (407) is meshed with the right side of the gear plate (404). A central shaft rod (408) is provided at the bottom of the supply pipe (302). The front end and back end of the surface of the central shaft rod (408) are movably connected to a shaft fixing plate (409) through a rotating shaft. The top of the back end of the shaft fixing plate (409) is fixedly connected to the front end of the supply pipe (302). The central shaft rod (408) and the support shaft (406) are connected by a transmission belt. A triangular bottom plate (410) is fixedly connected to the top of the guide fixing frame (102) and the bottom of the corresponding conveying pipe (303). A triangular plate (411) is fixedly connected to both the front and back ends of the top. An adjusting rod (412) is movably connected to the top of the inner cavity of the triangular plate (411) via a rotating shaft. The front and back ends of the adjusting rod (412) penetrate the front and back ends of the triangular plate (411). The adjusting rod (412) and the central shaft (408) are connected via a transmission belt. An adjusting gear (413) is fixedly sleeved on the surface of the adjusting rod (412). An adjusting groove (414) is fixedly connected to the top of the bottom plate (410) of the triangular plate and to the inner side of the triangular plate (411). An adjusting rack (415) is slidably connected to the inner cavity of the adjusting groove (414). The top of the adjusting rack (415) penetrates the top of the adjusting groove (414). The right side of the adjusting rack (415) and the left side of the adjusting gear (413) are meshed and connected. An ejector (416) is fixedly connected to the left side of the adjusting rack (415). A limit block (417) is slidably connected to the right side of the ejector (416) at the position corresponding to the adjusting slide (414). The right side of the limit block (417) and the left side of the adjusting slide (414) are fixedly connected. A conveying adjusting plate (418) is provided at the bottom of the inner wall of the conveying pipe (303). A conveying sealing plate (419) is fixedly connected to the bottom of the conveying adjusting plate (418) at the position corresponding to the ejector (416). The bottom of the conveying sealing plate (419) extends through to the bottom of the conveying pipe (303) and works in conjunction with the ejector (416).

4. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 3, characterized in that: The auxiliary adjustment mechanism (500) includes a rod fixing ring (501), the inner cavity of the rod fixing ring (501) and the surface of the central shaft (408) are fixedly connected, an auxiliary adjustment plate (502) is fixedly connected to the right side of the rod fixing ring (501), a rubber part (503) is fixedly connected to the bottom left side of the auxiliary adjustment plate (502), a circuit adjustment plate (504) is provided on the right side of the inner wall of the circuit pipe (301), a circuit sealing plate (505) is fixedly connected to the right side of the circuit adjustment plate (504) and at the position corresponding to the rubber part (503), and the right side of the circuit sealing plate (505) penetrates the right side of the circuit pipe (301) and cooperates with the rubber part (503).

5. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 4, characterized in that: The distance between the rubber component (503) and the circuit sealing plate (505) is greater than the distance between the ejector (416) and the conveying sealing plate (419).

6. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 2, characterized in that: A control air rod (205a) is fixedly connected to the left side of the top of the telescopic sleeve (205), and the top of the control air rod (205a) is fixedly connected to the bottom of the upper platform (107).

7. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 3, characterized in that: A first spring rod (410a) is fixedly connected to the top of the bottom plate (410) of the triangular plate and to the right side of the corresponding adjusting groove (414). A first reset spring (410b) is fixedly connected to the top of the inner cavity of the first spring rod (410a). The top of the first reset spring (410b) is fixedly connected to the bottom of the conveying sealing plate (419).

8. The hydraulic linkage control device for a bidirectional slewing platform of an excavator according to claim 4, characterized in that: The top of the guide fixing frame (102) is fixedly connected to a second spring rod (102a), and the left side of the inner cavity of the second spring rod (102a) is fixedly connected to a second reset spring (102b). The left side of the second reset spring (102b) is fixedly connected to the right side of the circuit sealing plate (505).

9. A hydraulic linkage control method for a bidirectional slewing platform of an excavator, characterized in that: The hydraulic linkage control device for a bidirectional slewing platform of an excavator, as described in any one of claims 1 to 8, further includes, Phase 1: The telescopic sleeve (205) is in the lowest position, and the two platforms rotate synchronously at full speed to achieve maximum power output and meet the needs of rapid site transfer or heavy-duty rough operation. Second stage: The telescopic sleeve (205) rises, the hydraulic oil volume remains unchanged, the speed of the two platforms is synchronized, and the telescopic sleeve (205) achieves smooth separation when it rises to the critical value, avoiding impact and vibration; Third stage: The telescopic sleeve (205) rises to the high position, and the rotary platform (103) rotates independently at a low speed to achieve low-speed fine adjustment.

10. A hydraulic linkage control method for a bidirectional slewing platform of an excavator according to claim 9, characterized in that: include, In the third stage, the back pressure of the return oil is established through the auxiliary adjustment mechanism (500) to avoid the low-speed crawling phenomenon of the hydraulic motor (201) and ensure that it rotates smoothly and evenly at extremely low speeds.

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