A hydraulic self-propelled crane

Abstract

This utility model discloses a hydraulic self-propelled crane, belonging to the field of crawler crane technology. The crane mainly includes a crane structure and a chassis moving structure. The chassis moving structure consists of an integral high-strength steel plate chassis, a hydraulic outrigger system with sliding tracks, and a leveling and stabilization auxiliary system. Its core is the use of alternating support from the hydraulic outriggers and the propulsion of the sliding track cylinders to achieve the crane's step-like self-propelled movement, thus completely replacing the traditional "four wheels and one track" crawler walking mechanism. This utility model effectively solves the problems of easy wear, high maintenance costs, significant road surface damage, and inconvenient relocation associated with traditional crawler cranes. It has significant advantages such as simplified structure, low maintenance costs, strong adaptability to various scenarios, safe and reliable operation, and high economy, making it particularly suitable for indoor, scenic, and confined space operations where ground protection and movement precision are critical.

Description

Technical Field

[0001] This utility model relates to a hydraulic self-propelled crane, belonging to the field of crawler crane technology. Background Technology

[0002] While traditional crawler crane chassis meet the lifting requirements to a certain extent in current construction machinery operations, they have also revealed many unsolvable problems in actual application, resulting in high cost burdens and safety hazards for construction companies.

[0003] 1. The mechanical structure is prone to damage.

[0004] Tracks and tracked components are constantly exposed to the external environment. When operating on construction sites with high levels of sand and gravel, sand and gravel can easily enter the gaps between the tracks and tracked components, leading to accelerated wear. According to statistics from a construction company, the failure rate of tracked cranes operating in sand and gravel quarries, including track chain breakage and track roller wear, is as high as 65%, and the average trouble-free operating time is only 60% of that under normal conditions. Furthermore, after operating in rainy or snowy weather, if the tracks and related components are not maintained promptly, rust problems become severe, further shortening the service life of the components.

[0005] If the parallelism of the left and right tracks exceeds the specified value, or if the wear of the drive wheel, carrier roller, guide wheel, and track roller is uneven, causing their center lines to misalign with the center line of the track roller frame, it will lead to track deviation. Hydraulic system failure is also a cause, such as inconsistent leakage in hydraulic components or stuck valve cores, resulting in different driving forces on both sides of the tracks, thus causing deviation.

[0006] The track rollers use a centralized lubrication system. If the lubrication is inadequate, it will cause wear on the track roller bushings, which in turn will cause the track shoes to wear out and the track shoes to break off in pieces.

[0007] Insufficient lubrication of the track shoe pins will cause dry friction between them and the track shoe pin holes, resulting in noise during movement and accelerating the wear of the pins and pin holes.

[0008] Large-tonnage track plates are large in volume and length, and heat deformation during the heat treatment process after casting is difficult to control, resulting in poor coaxiality of pin holes, poor fit between holes and shafts, and producing loud noise and wear.

[0009] If the tracks are too loose or too tight, it will cause noise when the vehicle is running, and cause premature wear of the track plates and wheels. It may also affect the walking performance and stability of the tracked crane.

[0010] 2. The hydraulic system has poor stability.

[0011] Seals in traditional crawler crane hydraulic systems are prone to aging and failure under long-term high-pressure and high-temperature conditions, leading to hydraulic oil leakage. Data from a construction machinery equipment testing agency shows that seal failure accounts for over 72% of hydraulic oil leakage failures.

[0012] In high-temperature environments during summer or during prolonged overload operations, the probability of hydraulic oil temperature exceeding 65°C reaches 55%. Excessively high oil temperature will reduce the viscosity of hydraulic oil, affect the working efficiency of the hydraulic system, and even cause hydraulic pump failure. Among hydraulic pump failures, those caused by oil contamination and component aging account for as much as 83%.

[0013] 3. Poor economic efficiency and adaptability to different scenarios.

[0014] In terms of manufacturing costs, traditional crawler cranes use 42% more steel than wheeled cranes of the same tonnage, resulting in a significant increase in their manufacturing costs.

[0015] In terms of operation, traditional crawler cranes have a travel speed of only 1-5 km / h. When long-distance relocation is required between different construction sites, flatbed trucks must be used for transportation, which not only increases transportation costs (accounting for about 25% of the total operating cost of the equipment) but also prolongs the relocation time.

[0016] Tracked cranes can cause serious damage to municipal roads and scenic roads. According to statistics, after tracked cranes travel on municipal roads, the road surface damage rate exceeds 38%, and construction companies have to bear high road repair costs.

[0017] The operation and maintenance of traditional crawler cranes require professional technicians, and their labor costs are 52% higher than those of ordinary construction machinery.

[0018] Currently, most improvement solutions for traditional crawler crane chassis in the industry focus on optimizing local components. For example, some companies use new wear-resistant materials to make track plates to improve track wear resistance, but this approach does not change the overall structure and movement logic of the tracks, and cannot fundamentally solve the problems of easy wear and high maintenance costs associated with the "four wheels and one track". Other companies improve lubrication methods, such as using automatic lubrication systems, to reduce wear on components such as track rollers, but this solution can only reduce the failure rate to a certain extent and still does not effectively solve core problems such as hydraulic system leakage and track misalignment. Overall, existing improvement solutions have not broken through the traditional track design framework and cannot meet the needs of construction companies for simplified crawler crane structures, reduced maintenance costs, and improved adaptability to various scenarios. A revolutionary chassis mobility solution is urgently needed. Utility Model Content

[0019] This invention overcomes the shortcomings of existing technologies and provides a hydraulic self-propelled crane that achieves the goals of simplified chassis structure, reduced maintenance costs, improved scene adaptability, and enhanced operational safety.

[0020] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a hydraulic self-propelled crane, including a crawler crane structure excluding the crawler chassis, and a chassis moving structure of the crawler crane. The lower part of the crane structure is rigidly or flexibly mounted on the chassis moving structure, and the chassis moving structure includes: The chassis has an upper part for connecting the crane structure and a lower part for connecting the hydraulic outrigger structure with sliding tracks and the ground support; The hydraulic outrigger structure with sliding tracks includes vertical working support and longitudinal translational propulsion, providing stable working support and movement power for the crane structure; The outrigger leveling structure adjusts the hydraulic outrigger structure with sliding tracks to maintain stable support between the outriggers and the ground.

[0021] Furthermore, the chassis includes a chassis body and sliding shoes. The upper side of the chassis body is connected to the slewing support of the crane structure, and two sliding shoes are symmetrically arranged on the lower side of the chassis body. The sliding shoes have a structure that is flat in the middle and curved upwards at the front and back.

[0022] Furthermore, the hydraulic outrigger structure with slide rails includes outrigger cylinders, travel cylinders, and guide grooves with guide rails. Multiple guide grooves with guide rails are symmetrically fixed along the longitudinal direction of the chassis on the lower side of the chassis. Each guide groove with guide rails has an outrigger cylinder mounted on its guide rail. The cylinder body of the outrigger cylinder is vertically mounted on the guide rail. Multiple travel cylinders are fixed along the longitudinal direction of the chassis on the lower side of the chassis, and each travel cylinder corresponds to a specific guide groove with a guide rail. The telescopic rod of the travel cylinder is fixedly mounted on the guide rail. The travel cylinder drives the guide rail to move along the guide groove, thus realizing the movement of the chassis.

[0023] Furthermore, the outrigger leveling structure includes an attitude sensor, an adaptive outrigger plate, and a slide rail protection structure. The attitude sensor is mounted on the chassis and controls the extension and retraction length of the corresponding outrigger cylinder through a hydraulic control system on the chassis moving structure. The adaptive outrigger plate is spherically hinged to the bottom of the telescopic rod of the outrigger cylinder, and can adapt to ±5° of ground protrusions or depressions. The slide rail protection structure is a copper alloy guide sleeve, which is fixedly installed in the guide groove with guide rail.

[0024] Furthermore, the chassis is made of Q690 grade high-strength wear-resistant alloy steel plate with a yield strength ≥690MPa. Its thickness is designed differently according to the crane tonnage: the thickness is not less than 30mm for 20-ton cranes and 40-50mm for 200-ton cranes. The bottom of the chassis is provided with diamond-shaped anti-slip texture with a depth of 2-3mm, and a detachable polyurethane wear-resistant pad can be installed. The wear-resistant pad is 10mm thick and has a Shore A85 hardness.

[0025] Furthermore, the chassis and the crane structure are connected by a flexible connection, which includes a rubber shock absorber with an elastic modulus of 5 MPa. The flexible connection is used when operating on bumpy roads, while a rigid connection is used during normal operation.

[0026] Furthermore, the number of outriggers in the hydraulic outrigger structure with slide rails is configured according to the crane tonnage: 4 outriggers in an H-shape are used for cranes of 20-50 tons, and 6 outriggers in an H-shape are used for cranes of 200 tons and above. The slide rail stroke is adjustable, with 500 mm in narrow spaces and 1000 mm in open spaces, and the parallelism error of the slide rail is ≤0.1 mm / m.

[0027] This utility model relates to a leveling method for a hydraulic self-propelled crane, based on the crane, comprising the following steps: The chassis level is monitored in real time using an electronic level sensor with an accuracy of ≤0.1°; When the ground tilt is detected to be greater than 1°, the hydraulic control system automatically adjusts the extension and retraction length of the corresponding outrigger cylinder to keep the chassis level error ≤0.5°. The adaptive support plate with spherical hinge adapts to ground unevenness of ±5°, ensuring support stability.

[0028] This utility model relates to a method for moving a hydraulic self-propelled crane, which, based on the crane, includes the following cyclical steps: Support phase: The outrigger cylinders extend, lifting the frame and raising the chassis 50-100mm off the ground; Pushing phase: The travel cylinder starts, outputting a thrust that matches the support force of the outriggers, pushing the chassis to move along the slide, with the moving distance equal to the slide stroke; Reset phase: The outrigger cylinder retracts, the chassis touches the ground, and the travel cylinder pulls the outrigger back to its original position, completing a single step. The time for a single cycle is controlled to 5-10 seconds by the hydraulic system, or shortened to 3-5 seconds by using a high-speed solenoid valve.

[0029] When a turn is required, this utility model controls the extension and retraction lengths of the travel cylinders on both sides to achieve the turn accordingly.

[0030] Furthermore, the hydraulic system of the traveling cylinder includes a variable pump and a pressure sensor to monitor the working pressure of the cylinder in real time; and the slide rail protection structure also includes a double-lip seal with a sealing rating of IP65; the cylinder body of the outrigger cylinder is made of high-strength alloy steel with a yield strength ≥900MPa and is equipped with heat sinks.

[0031] Compared with existing technologies, this utility model offers several advantages: it eliminates over 20 easily damaged components, including the "four wheels and one track" and track tensioning mechanism of traditional crawler cranes, significantly simplifying the equipment structure. The integrated steel plate chassis increases the ground contact area, and the step-by-step movement method allows for controllable movement speed with a single movement error of ≤5mm, enabling operators to precisely control the equipment's position. Due to the short movement distance, it has a smaller impact on overall energy consumption, and significantly reduces maintenance and transportation costs, bringing substantial economic benefits to enterprises. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of this utility model.

[0034] Figure 2 This is a bottom view of the structure of this utility model.

[0035] Figure 3 This is a top view of the structure of this utility model.

[0036] Figure 4 This is a schematic diagram of the state of the present invention when it is in motion. Figure 1 .

[0037] Figure 5 This is a schematic diagram of the state of the present invention when it is in motion. Figure 2 .

[0038] Figure 6 This is a schematic diagram of the state of the present invention when it is in motion. Figure 3 .

[0039] Figure 7 This is a schematic diagram of the state when the present invention is turning.

[0040] Figure 8 This is a schematic diagram of the state of the present invention when going up a small slope.

[0041] In the diagram: 1 is the crane structure, 2 is the chassis moving structure, 21 is the chassis, 211 is the chassis body, 212 is the skid, 22 is the hydraulic outrigger structure with a slide rail, 221 is the outrigger cylinder, 222 is the travel cylinder, 223 is the guide groove with a guide rail, 23 is the outrigger leveling structure, 231 is the attitude sensor, 232 is the adaptive foot plate, and 233 is the slide rail protection structure. Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments.

[0043] like Figure 1-8 As shown, this utility model mainly consists of three parts: an integral steel plate chassis, a hydraulic outrigger system with sliding tracks, and a leveling and stabilization auxiliary system. The integral steel plate chassis serves as the load-bearing foundation and is rigidly or flexibly connected to the frame; the hydraulic outrigger system with sliding tracks serves as the drive core, realizing equipment movement through a cycle of "alternating support + cylinder push"; the leveling and stabilization auxiliary system is used to ensure the levelness and stability of the equipment during operation.

[0044] I. Integral Steel Plate Chassis 1. Material selection: Q690 grade high-strength wear-resistant alloy steel plate with a yield strength ≥690MPa is selected. This material has excellent wear resistance and load-bearing capacity. Its wear resistance is 2.5 times higher than that of ordinary steel plate, which can meet the load-bearing requirements of crawler cranes under various complex working conditions.

[0045] 2. Thickness Design: The design is differentiated based on the tonnage of the crawler crane. For a 20-ton crawler crane, the steel plate thickness should be no less than 30mm; for a 200-ton crawler crane, a steel plate thickness of 40-50mm is recommended. The steel plate thickness is optimized using finite element analysis software. While ensuring the load-bearing strength to withstand three times the equipment's own weight, the weight is reduced by 12% compared to traditional crawler cranes, effectively lowering the overall weight of the equipment.

[0046] 3. Connection method: Under normal operating conditions, the steel plate and the frame are rigidly connected to ensure load-bearing stability; when operating on bumpy roads, a flexible connection is achieved through rubber shock-absorbing pads. The elastic modulus of the rubber shock-absorbing pads is 5MPa, which can reduce the damage to the frame from ground impact and extend the service life of the equipment. According to tests, the flexible connection method can reduce the impact force on the frame by 40%.

[0047] 4. Bottom Design: Anti-slip textures with a depth of 2-3mm are machined on the bottom of the steel plate. The textures are distributed in a diamond pattern, which can increase the friction coefficient of the steel plate on muddy and gravel surfaces by 0.4. At the same time, a detachable polyurethane wear-resistant pad can be installed according to the operational needs. The wear-resistant pad is 10mm thick and has a Shore A85 hardness. It is easy to replace and the replacement cycle is 3 times longer than that of traditional track plates, thus reducing maintenance costs.

[0048] II. Hydraulic outrigger system with sliding tracks 1. Outrigger Layout and Parameters: The number of outriggers is determined based on the tonnage of the crawler crane. For 20-50 ton crawler cranes, a 4-H-type outrigger layout is used; for large tonnage crawler cranes over 200 tons, a 6-H-type outrigger layout is recommended. The lateral extension span of 6 outriggers is 35% wider than traditional crawler cranes, significantly improving equipment stability. Each outrigger integrates a transverse or longitudinal slide rail at its top. The slide rail stroke can be adjusted according to the operating environment; 500mm is recommended for narrow spaces, and 1000mm for open spaces. The parallelism error of the slide rail is strictly controlled to ≤0.1mm / m to ensure the accuracy of equipment movement.

[0049] 2. Drive Cycle Process: Taking the forward movement of the device as an example, the specific process is as follows: Support Phase: The outriggers extend hydraulically, lifting the chassis and detaching the plate chassis from the ground. The ground clearance is controlled at 50-100mm, which effectively prevents friction between the plate and the ground, reducing wear. The supporting force of the outriggers is determined according to the tonnage of the equipment; the supporting force of the outriggers for a 20-ton crawler crane is no less than 300kN, and the supporting force of the outriggers for a 200-ton crawler crane is no less than 500kN.

[0050] Pushing phase: The outrigger slide cylinders are activated, outputting thrust that matches the outrigger's supporting force, pushing the frame backward along the slide and causing the plate chassis to move forward a distance equal to the slide's travel. The cylinder's working pressure is monitored in real time by a pressure sensor to ensure stable thrust.

[0051] Reset Phase: The outrigger cylinders retract, the steel plate chassis touches the ground, the outrigger slide cylinders activate, pulling the frame backward to return the outriggers to their initial position, completing one step. The time for a single cycle can be controlled to 5-10 seconds by optimizing the hydraulic system. For scenarios with high mobility requirements, high-speed solenoid valves (response time ≤0.1s) can be used to shorten the cycle time to 3-5 seconds.

[0052] III. Leveling and Stability Support System 1. Real-time leveling function: Equipped with an electronic level sensor with an accuracy of ≤0.1°, this sensor uses a dual-axis measurement method to monitor the level status of the equipment in real time. When the ground tilt exceeds 1°, the sensor transmits a signal to the control system, which automatically adjusts the height of the corresponding outriggers to ensure that the steel plate chassis level error is ≤0.5°, preventing the frame from twisting and deforming due to tilting.

[0053] 2. Adaptive outrigger plate: A spherical hinged outrigger plate is installed at the bottom of the outrigger. The diameter of the outrigger plate is 200-300mm, which can adapt to ground protrusions or depressions of ±5°. The contact area between the outrigger plate and the ground is increased by 40% compared with traditional outrigger plates, which effectively reduces the ground pressure and improves the support stability. When working on soft ground, it can prevent the outrigger from sinking.

[0054] 3. Slide Protection Design: The slide incorporates a copper alloy guide sleeve. The copper alloy has a hardness of HB200, providing excellent wear resistance and reducing frictional resistance between the slide and the outriggers, lowering the coefficient of friction to below 0.1. Simultaneously, double-lip seals with an IP65 sealing rating are used, effectively preventing sand and wastewater from entering the slide, protecting the slide and cylinder components, and extending their service life.

[0055] Compared with traditional tracked crane chassis systems, this utility model has the following significant advantages: 1. Simplified structure and reduced maintenance costs: This utility model eliminates more than 20 easily damaged components of traditional crawler cranes, such as the "four wheels and one track" and the track tensioning mechanism, significantly simplifying the equipment structure. Actual application statistics show that the mean time between failures (MTBF) is doubled, the average number of maintenance visits per year is reduced from 12 to less than 5, and maintenance costs are reduced by 50%, saving construction companies substantial maintenance expenses.

[0056] 2. Significantly improved adaptability to different scenarios: The integrated steel plate chassis increases the ground contact area by 65% ​​compared to traditional tracks, significantly reducing ground pressure and lowering the risk of sinking in soft ground by 70%. Simultaneously, the damage rate to the ground caused by the steel plate chassis decreases from 35% to below 5%, achieving a 98% ground paving integrity rate in municipal greening scenarios. When operating inside factory buildings, the equipment can pass through passages ≤3m wide, reducing the required operating space in narrow areas by 30%, thus meeting the needs of various complex operating scenarios.

[0057] 3. Improved ease of operation and safety: The step-by-step movement method allows for controllable equipment speed, with a single movement error of ≤5mm, enabling operators to precisely control the equipment's position. The equipment's anti-tipping capability is increased by 50%, and its stability coefficient during hoisting rotation is ≥1.5, effectively reducing the accident rate during hoisting operations. Furthermore, the equipment's operational difficulty is reduced, shortening the operator training cycle from 3 months to 1 month, thus reducing training costs for enterprises.

[0058] 4. Significant economic advantages: In terms of manufacturing costs, this utility model, through optimized structural design, reduces the manufacturing cost of the 200-ton crawler crane by 8% compared to traditional crawler cranes. In terms of operating costs, although energy consumption increases by 2-3 times when the equipment moves short distances, the impact on overall energy consumption is small due to the short distance. Furthermore, maintenance and transportation costs are significantly reduced, with the average annual operating cost of the 200-ton equipment decreasing from 800,000 yuan to 650,000-700,000 yuan, bringing significant economic benefits to enterprises.

[0059] Example 1: Application of a 20-ton indoor lifting crawler crane I. Equipment Parameter Settings 1. Integral steel plate chassis It is made of Q690 grade high-strength wear-resistant alloy steel plate, 30mm thick, with dimensions (length × width) of 6m × 3m. A 10mm thick polyurethane wear-resistant pad is installed on the bottom of the steel plate. The wear-resistant pad is connected to the steel plate with bolts for easy replacement.

[0060] 2. Hydraulic outrigger system with sliding tracks It features four H-shaped outriggers with a 500mm slide stroke and a 300kN cylinder thrust. The hydraulic system uses a variable displacement pump control, allowing for adjustment of flow and pressure according to operational needs, thus improving energy efficiency.

[0061] 3. Leveling and stabilization support system The electronic level sensor, with an accuracy of 0.05°, is installed in the middle of the frame to ensure accurate monitoring of the equipment's levelness. The spherical support plates have a diameter of 200mm, and anti-slip rubber pads are attached to the bottom of the plates to further improve support stability.

[0062] II. Detailed Work Procedures 1. Equipment arrival Transport the equipment to the factory gate and unload it using a flatbed truck. At this point, retract the outriggers to adjust the span to 2 meters to accommodate the width of the passageway at the factory gate, and slowly drive it into the factory.

[0063] 2. Homework Preparation Upon reaching the hoisting position, the operation and control system extends the outriggers, increasing the span to 4 meters and thus the support area for the equipment. The leveling system is then activated, with electronic level sensors monitoring the equipment's horizontal status in real time. The control system automatically adjusts the height of each outrigger to ensure the steel plate chassis has a horizontal error of ≤0.3°, guaranteeing the equipment's stability.

[0064] 3. Lifting operations During hoisting, if fine-tuning of the equipment position is required, the hydraulic outrigger drive system is activated. First, the front outrigger extends and lifts the front of the frame to a height of 50mm off the ground. Then, the front outrigger slide cylinder is activated, pushing the frame backward by 500mm, which in turn moves the rear outrigger and the plate chassis forward. Next, the front outrigger retracts, and the rear outrigger extends and lifts the rear of the frame. Finally, the rear outrigger slide cylinder is activated, pulling the frame forward to return the front outrigger to its initial position, completing one step movement and achieving precise positioning of the equipment.

[0065] 4. Equipment removal After the hoisting operation is completed, the outriggers are retracted, the outrigger span is adjusted to 2m, and the machine is slowly moved out of the factory building by stepping and transferred to the next work site.

[0066] Example 2: Application of 50-ton-class ancient building restoration in scenic areas I. Equipment Parameter Settings 1. Integral steel plate chassis The equipment is made of Q690 grade high-strength wear-resistant alloy steel plate, 35mm thick, with dimensions (length × width) of 8m × 4m. A 3mm deep diamond-shaped anti-slip pattern is machined on the bottom of the steel plate to increase the friction coefficient on the scenic area's stone pavement and prevent equipment slippage.

[0067] 2. Hydraulic outrigger system with sliding tracks It adopts 6 H-shaped outriggers with a slide stroke of 800mm and a cylinder thrust of 450kN. To improve the moving efficiency, the hydraulic system is equipped with high-speed solenoid valves with a response time of ≤0.1s, controlling the time of a single cycle to about 4 seconds.

[0068] 3. Leveling and stabilization support system In addition to the standard electronic level sensor and spherical support plate, six adjustable support feet are evenly distributed along the edge of the steel plate chassis. Each support foot can bear a load of 5 tons and its height can be adjusted individually to adapt to the slightly undulating ground of the scenic area (±3°). At the same time, an automatic lubrication system is installed inside the slide. The lubrication system sprays grease onto the slide and guide sleeve at regular intervals, with a lubrication cycle of 1 hour, reducing component wear.

[0069] II. Advantages of the operation 1. Ground protection Because the steel plate chassis has a large grounding area and a grounding specific pressure of ≤0.1MPa, it will not damage the road surface when operating on the stone slab road surface in the scenic area. Actual operation verification shows that the road surface integrity rate reaches 100%, which meets the strict requirements of the scenic area for ground protection.

[0070] 2. Terrain adaptation The adjustable support feet can adjust their height individually according to the undulations of the scenic area's ground, keeping the steel plate chassis level. This eliminates the need for leveling the work site, reducing pre-construction site preparation work and improving operational efficiency.

[0071] 3. Precise movement The stepping movement speed is 0.3 km / h. Operators can precisely control the movement distance and direction of the equipment through the control system to avoid collisions with ancient buildings during movement and ensure the safety of the ancient buildings.

[0072] This invention solves the problem of low mobility. Currently, the moving speed of equipment is ≤0.5km / h, which is insufficient for some operational scenarios requiring high mobility. To address this issue, the integral slide rail is replaced with a segmented slide rail, increasing the slide rail stroke to 1.5-2m. Simultaneously, the hydraulic system control logic is optimized, employing a dual-cylinder synchronous drive method to further shorten cycle time. Testing shows that the optimized equipment moving speed can be increased to 0.8-1km / h, meeting the mobility efficiency requirements of most short-distance operational scenarios.

[0073] This invention solves the problem of poor adaptability to complex terrain. When operating on gravel ground or gently sloping surfaces (≤10°), the equipment is prone to tilting and slipping. To address this issue, 4-6 small hydraulic jacks are added to the steel plate chassis, each with a load-bearing capacity of 5 tons. When the ground protrusion is ≤100mm, the corresponding hydraulic jack can be activated individually to lift the steel plate chassis, preventing direct contact between the steel plate and the protruding ground. Simultaneously, long-life grease is added to the slide rails, with a service life of up to 6 months, reducing wear on the slide rails during operation on complex terrain. Through these improvements, the equipment achieves a stability of over 95% when operating on gravel ground or gently sloping surfaces.

[0074] This invention solves the problem of excessive load on the slide rails and outriggers. Prolonged high-intensity operation leads to accelerated wear of the slide rails and excessive load on the outrigger cylinders, affecting the equipment's service life. To address this issue, the inner wall of the slide rail is chrome-plated with a thickness of 0.1mm and a hardness exceeding HRC60, significantly improving the slide rail's wear resistance. Testing shows that the slide rail wear rate decreased from 0.5mm / year to 0.1mm / year. The outrigger cylinders utilize high-strength alloy cylinder barrels with a yield strength ≥900MPa, and heat sinks are added externally, increasing the heat dissipation area by 50%, effectively reducing the cylinder's operating temperature and extending the life of the cylinder seals to 1.5 times the original lifespan.

[0075] This invention employs an integral high-strength steel plate connection structure to the vehicle frame, including a rigid connection structure for normal scenarios and a flexible connection structure achieved through shock absorption mechanisms (such as rubber shock-absorbing pads) for bumpy scenarios. This protection covers multiple methods of connecting the steel plate and the vehicle frame, ensuring that the connection structure of this invention is protected under different operating conditions.

[0076] This utility model discloses a hydraulic outrigger layout with slide rails and a "alternating support-cylinder push" drive logic. Specifically, it includes the structural design of 4 or 6 H-shaped outriggers, the stroke design of the slide rails, and a cyclic drive method involving front outrigger support for pushing and rear outrigger support for resetting. This feature clarifies the core drive technology of this utility model.

[0077] This utility model integrates a leveling system, an adaptive support plate, and a slide protection auxiliary system.

[0078] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hydraulic self-propelled travelling crane comprising the rest of the crawler crane structure (1) without a crawler travelling chassis, characterised in that, It also includes a chassis moving structure (2) for a crawler crane, wherein the lower part of the crane structure (1) is rigidly or flexibly mounted on the chassis moving structure (2), and the chassis moving structure (2) includes: The chassis (21) has an upper part for connecting the crane structure (1) and a lower part for connecting the hydraulic outrigger structure (22) with slide rails and the ground support; The hydraulic outrigger structure (22) with a slide rail includes a vertical working support and a longitudinal translational push, providing stable working support force and moving power for the crane structure (1); The outrigger leveling structure (23) adjusts the hydraulic outrigger structure (22) with slide rails to maintain stable support between the outrigger and the ground.

2. The hydraulic mobile crane of claim 1, wherein, The chassis (21) includes a chassis body (211) and a sliding shoe (212). The upper side of the chassis body (211) is connected to the slewing support of the crane structure (1). Two sliding shoes (212) are symmetrically arranged on the lower side of the chassis body (211). The sliding shoe (212) has a structure that is flat in the middle and curved upwards at the front and back.

3. The hydraulic mobile crane of claim 1, wherein, The hydraulic outrigger structure (22) with slide rails includes outrigger cylinders (221), travel cylinders (222), and guide grooves (223) with guide rails. Multiple guide grooves (223) with guide rails are symmetrically fixedly arranged on the lower side of the chassis (21) along the longitudinal direction. Each guide groove (223) with guide rails is provided with an outrigger cylinder (221). The cylinder body of the outrigger cylinder (221) is vertically arranged on the guide rail. Multiple travel cylinders (222) are fixedly arranged on the lower side of the chassis (21) along the longitudinal direction. Each travel cylinder (222) is correspondingly arranged with the corresponding guide groove (223) with guide rails. The telescopic rod of the travel cylinder (222) is fixedly arranged on the guide rail. The travel cylinder (222) drives the guide rail to move along the guide groove (223) to realize the movement of the chassis (21).

4. A hydraulic self-propelled crane according to claim 3, characterized in that, The outrigger leveling structure (23) includes an attitude sensor (231), an adaptive outrigger plate (232), and a slide rail protection structure (233). The attitude sensor (231) is mounted on the chassis (21) and controls the extension and retraction length of the corresponding outrigger cylinder (221) through the hydraulic control system on the chassis moving structure (2). The adaptive outrigger plate (232) is spherically hinged to the bottom of the telescopic rod of the outrigger cylinder (221), and can adapt to ±5° ground protrusions or depressions. The slide rail protection structure (233) is a copper alloy guide sleeve, which is fixedly installed in the guide groove (223) with guide rail.

5. A hydraulic self-propelled crane according to claim 1, characterized in that, The chassis (21) is made of Q690 grade high-strength wear-resistant alloy steel plate with a yield strength ≥690MPa. Its thickness is designed according to the crane tonnage: the thickness of a 20-ton crane is not less than 30mm, and the thickness of a 200-ton crane is 40-50mm. The bottom of the chassis (21) is provided with diamond anti-slip texture with a depth of 2-3mm, and a detachable polyurethane wear-resistant pad can be added. The wear-resistant pad is 10mm thick and has a Shore A85 hardness.

6. A hydraulic self-propelled crane according to claim 1, characterized in that, The chassis (21) and the crane structure (1) are connected by a flexible connection, which includes a rubber shock absorber pad with an elastic modulus of 5 MPa. The flexible connection is used when operating on bumpy roads, while a rigid connection is used during normal operation.

7. A hydraulic self-propelled crane according to claim 1, characterized in that, The number of outriggers in the hydraulic outrigger structure (22) with slide rails is configured according to the crane tonnage: 4 outriggers in an H-shape for 20-50 ton cranes, and 6 outriggers in an H-shape for cranes above 200 ton. The slide rail stroke is adjustable, with a stroke of 500 mm in narrow spaces and 1000 mm in open spaces. The parallelism error of the slide rail is ≤0.1 mm / m.

8. A hydraulic self-propelled crane according to claim 4, characterized in that, The hydraulic system of the traveling cylinder (222) includes a variable pump and a pressure sensor to monitor the working pressure of the cylinder in real time; and the slide rail protection structure (233) also includes a double lip seal with a sealing level of IP65; the cylinder body of the outrigger cylinder (221) is made of high-strength alloy steel with a yield strength ≥900MPa and is equipped with heat sinks.

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