A lifting machinery support device

Abstract

This invention discloses a lifting machinery support device, belonging to the field of crane support technology. This lifting machinery support device includes a horizontal telescopic column, a vertical telescopic column, a telescopic sleeve, and a support abutment assembly. The support abutment assembly consists of a support foot plate and several extension plates horizontally slidably disposed within its cavity. The telescopic end of the telescopic sleeve is connected to the extension plates via a hinged rod. When crane operation causes an increase in outrigger load, the pressure forces the telescopic end downwards, and the extension plates slide out from the foot plate through the hinged rod linkage, thereby adaptively increasing the effective ground contact area of ​​the support foot plate. Through a purely mechanical linkage structure, the support area automatically expands with increasing load, effectively reducing pressure on the foundation, preventing uneven settlement, and improving the crane's anti-overturning stability and operational safety under complex conditions such as soft soil foundations.

Description

Technical Field

[0001] This invention relates to the field of crane support technology, and more specifically to a crane machinery support device. Background Technology

[0002] The operational stability of large mobile cranes does not depend on their traveling chassis, but rather on the hydraulic outrigger system and its end support devices. The core function of these support devices is to safely and stably transfer the enormous load borne by the crane during lifting operations to the foundation. Among these, the support legs, which are in direct contact with the ground, are the final link in the entire force transmission path, and their performance determines the overall machine's anti-tipping capability and operational safety boundaries.

[0003] Current technologies generally employ support legs with a fixed ground area. However, crane lifting operations are a dynamic process, especially when lifting heavy loads and making large-scale rotations. The shift in the crane's center of gravity can cause drastic and instantaneous changes in the supporting reaction forces of each outrigger. According to the pressure formula (P=F / S), when the load (F) increases dramatically, the fixed area (S) will lead to a sharp increase in the local pressure (P) on the foundation, which can easily exceed the bearing capacity limit of soft soil foundations, causing uneven settlement and posing a significant safety hazard of overturning.

[0004] To address the issue of a fixed support area, existing technologies employ solutions that extend the support blocks using external power sources such as cylinders or motors. While these solutions can change the area, they have certain drawbacks. First, they rely on external systems such as sensors and electronic control units to trigger the action. Under harsh operating conditions commonly encountered by cranes, such as humidity, vibration, and high dust levels, electronic components are prone to failure, leading to malfunction of the extension function and insufficient reliability. Second, when the crane suddenly stops during rotation or the load suddenly swings, the load on the outriggers may change abruptly. The delay in the electronic control system causes the extension action to lag far behind the load change, and the device cannot respond in time, leaving the risk of overturning still present. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems in the prior art and provide a lifting machinery support device.

[0006] This invention provides a lifting machinery support device, including a horizontal telescopic column fixedly mounted on one side of the crane frame; a vertical telescopic column fixedly mounted on the telescopic end of the horizontal telescopic column; a telescopic sleeve vertically mounted at the bottom of the vertical telescopic column, comprising a first sleeve and a second sleeve vertically mounted, the first sleeve being slidably inserted into the second sleeve, the top of the first sleeve being connected to the telescopic end of the vertical telescopic column via a flange; a support foot plate connected to the bottom end of the second sleeve; a pre-compression buffer spring sleeved on the first sleeve, the top end of the pre-compression buffer spring being fixedly connected to the flange, and the bottom end being fixedly connected to the top end of the second sleeve; and a support abutment assembly installed at the bottom end of the second sleeve. The system includes a support foot plate and several extension plates horizontally slidably disposed within the support foot plate. A first through-slot is formed at the top of the support foot plate along the expansion direction of the extension plates, and a third through-slot is formed vertically on the second sleeve. Each of the extension plates is hinged to the first sleeve via a hinge rod. One end of the hinge rod is placed in the first through-slot and hinged to the extension plate, while the other end is placed in the third through-slot and hinged to the first sleeve. A second through-slot is formed at the bottom of the support foot plate along the sliding direction of the extension plates, and the bottom of the extension plates is flush with the bottom of the support foot plate. When the first sleeve moves downward, the extension plates expand via the hinge rods, thereby increasing the effective support area of ​​the entire support foot plate.

[0007] Preferably, the bottom end of the second sleeve is fixedly connected to the inner side of the bottom of the support foot plate, and the extension plate is fixedly connected to the second sleeve through the first telescopic rod. A first return spring is sleeved on the first telescopic rod, one end of the first return spring is fixedly connected to the second sleeve, and the other end is fixedly connected to the extension plate.

[0008] Preferably, several of the expansion plates are arranged in a circumferential array along the support foot plate.

[0009] Preferably, the expansion plate is hollow inside, and a second cavity is provided inside the expansion plate. A sliding plate is provided in the second cavity. The sliding plate is vertically slidably connected to the expansion plate. A plurality of limiting anchor rods are arranged in an array at the bottom of the sliding plate. Through holes matching the plurality of limiting anchor rods are opened one by one at the bottom of the expansion plate.

[0010] Preferably, a first wedge block is fixedly connected to the top of the sliding plate, and a second wedge block is provided inside the support foot plate. The second wedge block and the first wedge block are located on the same horizontal line. The second wedge block is connected to the inner side wall of the support foot plate. A vertically arranged second telescopic rod is fixedly connected to the top of the sliding plate. The top of the second telescopic rod is fixedly connected to the inner side of the expansion plate. A second return spring is sleeved on the outer side of the second telescopic rod. The bottom end of the second return spring is fixedly connected to the sliding plate, and the top end is fixedly connected to the inner side of the expansion plate.

[0011] Preferably, a plurality of ball bearings are embedded on the side of the support foot plate that slides against the extension plate.

[0012] Preferably, both the horizontal telescopic column and the vertical telescopic column are configured as hydraulic cylinders.

[0013] Preferably, the bottom of the support foot plate is detachably connected to a wear-resistant pad, and the wear-resistant pad is provided with a plurality of wear-resistant protrusions.

[0014] Compared with the prior art, the beneficial effects of the present invention are: First, the device automatically converts the load applied by the crane into a driving force that increases the support area through its telescopic sleeve. When the crane rotates while carrying a heavy load, causing a surge in load on one leg, the increased pressure is transmitted to the telescopic sleeve through the vertical telescopic column, forcing its telescopic end to move downwards. This downward linear movement, through a hinged rod mechanism, converts the downward movement of the first sleeve into the horizontal sliding of the extension plate within the support foot plate. The greater the load, the greater the downward movement of the telescopic end, the longer the extension plate extends, and the larger the support area. The device can adjust the grounding area in real time according to actual working conditions, ensuring that the pressure on the foundation (P=F / S) remains within a relatively stable and safe range, thereby improving operational safety in complex conditions such as soft soil foundations.

[0015] In non-working or low-load conditions, the extension plate can retract into the first cavity of the support foot plate, maintaining the integrity of the device, facilitating movement and transportation, and not occupying extra space; when needed, it can be quickly extended to provide support exceeding the area of ​​the original support foot plate. This ensures both the reliability of the support and the mobility of the crane.

[0016] The telescopic sleeve in this invention is purely mechanically and automatically triggered, requiring no additional sensors or control systems. It responds quickly and is highly reliable, avoiding the risk of failure due to electrical or hydraulic system malfunctions. Furthermore, it prevents sudden changes in outrigger load during crane slewing stops or sudden load swings, where delays in the electrical control system cause the extension action to lag far behind load changes, resulting in the device failing to respond in time and causing the crane to overturn. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the application of the present invention.

[0018] Figure 2 This is a schematic diagram of the support and abutment component structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the telescopic sleeve and support foot plate of the present invention.

[0020] Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle.

[0021] Figure 5 This is a schematic diagram of the internal structure of the expansion board of the present invention.

[0022] Figure 6 This is a schematic diagram of the bottom structure of the support foot plate of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Horizontal telescopic column; 2. Vertical telescopic column; 3. Support abutment assembly; 31. Support foot plate; 32. Extension plate; 33. First through slot; 34. Hinge rod; 4. Telescopic sleeve; 41. First sleeve; 42. Second sleeve; 43. Pre-compression buffer spring; 5. First telescopic rod; 6. First return spring; 7. Sliding plate; 8. Limiting anchor rod; 9. Through hole; 10. First wedge block; 11. Second wedge block; 12. Ball bearing; 13. Wear-resistant pad; 14. Wear-resistant protrusion; 15. Second telescopic rod; 16. Second return spring; 17. Second through slot; 18. Third through slot. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-6 To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art.

[0025] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in this invention are not strictly drawn to scale; the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0026] The present invention provides a lifting machinery support device, such as... Figures 1-4 As shown, the system includes a horizontal telescopic column 1, fixedly installed on one side of the crane frame; a vertical telescopic column 2, fixedly installed on the telescopic end of the horizontal telescopic column 1; a telescopic sleeve 4, vertically installed at the bottom of the vertical telescopic column 2, including a first sleeve 41 and a second sleeve 42, the first sleeve 41 being slidably inserted into the second sleeve 42, the top of the first sleeve 41 being connected to the telescopic end of the vertical telescopic column 2 via a flange; a support foot plate 31 connected to the bottom end of the second sleeve 42, a pre-compression buffer spring 43 being sleeved on the first sleeve 41, the top end of the pre-compression buffer spring 43 being fixedly connected to the flange, and the bottom end being fixedly connected to the top end of the second sleeve 42; and a support abutment assembly 3, installed at the bottom end of the second sleeve 42, including the support foot plate 31 and... Several extension plates 32 are horizontally slidably disposed within the support foot plate 31. A first through groove 33 is formed on the top of the support foot plate 31 along the expansion direction of the extension plates 32, and a third through groove 18 is formed on the second sleeve 42 vertically. The extension plates 32 are all hinged to the first sleeve 41 by hinge rods 34. One end of the hinge rod 34 is placed in the first through groove 33 and hinged to the extension plate 32, and the other end is placed in the third through groove 18 and hinged to the first sleeve 41. A second through groove 17 is formed on the bottom of the support foot plate 31 along the sliding direction of the extension plates 32, and the bottom of the extension plates 32 is flush with the bottom of the support foot plate 31. When the first sleeve 41 moves down, the extension plates 32 are expanded by the hinge rods 34, thereby increasing the effective support area of ​​the entire support foot plate 31.

[0027] In this embodiment, the effective support area of ​​the support base 31 is adaptively and dynamically expanded, thereby solving the problem mentioned in the background art of excessive pressure on the foundation due to a fixed support area, which could lead to uneven settlement or even overturning, a major safety hazard.

[0028] First, the device automatically converts the load applied by the crane into a driving force that increases the support area through the telescopic sleeve 4. When the crane rotates while carrying a heavy load, causing a surge in load on one leg, the increased pressure is transmitted to the telescopic sleeve 4 through the vertical telescopic column 2, forcing its telescopic end to move downward. The downward linear movement is converted into the horizontal sliding of the extension plate 32 within the support foot plate 31 through the hinge rod 34 mechanism. The greater the load, the greater the downward movement of the telescopic end, the longer the extension plate 32 extends, and the larger the support area. The larger the area due to the greater pressure, the more the grounding area can be adjusted in real time according to the actual working conditions, ensuring that the pressure on the foundation (P=F / S) is maintained within a relatively stable and safe range, thereby improving the safety of operation in complex working conditions such as soft soil foundations.

[0029] In non-working or low-load conditions, the extension plate 32 can retract into the first cavity of the support foot plate 31, maintaining the integrity of the device, facilitating movement and transportation, and not occupying extra space; while when needed, it can be quickly extended to provide support exceeding the area of ​​the original support foot plate 31. This ensures both the reliability of the support and the mobility of the crane.

[0030] The telescopic sleeve 4 in this invention is purely mechanically and automatically triggered, requiring no additional sensors or control system access. It responds quickly and is highly reliable, avoiding the risk of failure due to electrical or hydraulic system malfunctions. Furthermore, it avoids the situation where, when the crane suddenly stops during rotation or the load suddenly swings, the outrigger load may change abruptly, and the delay in the electrical control system causes the extension action to lag far behind the load change, while the device cannot respond in time, leading to the crane overturning.

[0031] The telescopic sleeve 4 is defined as a sliding fit between the first sleeve 41 and the second sleeve 42, and a pre-compression buffer spring 43 is added. The double-sleeve structure of the first sleeve 41 and the second sleeve 42 provides a stable and reliable guiding and motion foundation for the hinge rod 34, ensuring the precise force transmission path. The pre-compression buffer spring 43 constitutes a preliminary buffer and pressure sensing unit. When the load initially increases, the pre-compression buffer spring 43 is compressed first, absorbing part of the impact energy and playing a buffering role; when the load continues to increase and exceeds the pre-compression buffer spring 43, the first sleeve 41 begins to slide relative to the first sleeve to trigger area expansion. The pre-compression buffer spring 43 is the pressure threshold, avoiding malfunctions under slight load fluctuations, making the area expansion action more purposeful and smooth, and optimizing the accuracy of the adaptive process. The preloaded buffer spring 43 in this invention is made of nickel-chromium alloy. The yield strength and tensile strength of nickel-chromium alloy are much higher than those of ordinary spring steel. It can maintain structural integrity under the high load conditions of large crane outriggers, avoid plastic deformation or failure, and ensure that the preloaded buffer spring is accurately compressed within the load threshold. The passivation film formed by nickel-chromium alloy can effectively resist chloride ion and oxidation corrosion, reduce the performance degradation of the spring caused by environmental erosion, and extend its service life.

[0032] A second through slot 17 is formed at the bottom of the support base 31, and the bottom of the extension plate 32 is flush with the bottom of the base, ensuring that the bottom of the extension plate 32 remains coplanar with the bottom surface of the support base 31 during extension and retraction, forming a complete and flat support plane. This avoids stress concentration or swaying caused by height differences, ensuring the stability and uniform force distribution of the support. The flat bottom surface allows for more sufficient contact between the support base 31 and the foundation, resulting in uniform pressure distribution and further reducing local pressure, directly serving the goal of reducing foundation pressure. In this design, an infrared sensor and infrared receiver are installed between the top surface of the second sleeve 42 and the top surface of the first sleeve 41, with a fixed distance between them. The distance the second sleeve 42 moves downward is fed back by the controller, thereby controlling the corresponding extension distance of the vertical telescopic column 2.

[0033] Preferred, such as Figures 1-3 As shown, the bottom end of the second sleeve 42 is fixedly connected to the inner side of the bottom of the support foot plate 31. The extension plate 32 is fixedly connected to the second sleeve 42 through the first telescopic rod 5. A first return spring 6 is sleeved on the first telescopic rod 5. One end of the first return spring 6 is fixedly connected to the second sleeve 42, and the other end is fixedly connected to the extension plate 32.

[0034] In this embodiment, the extension plate 32 is connected to the second sleeve 42 via the first telescopic rod 5 and the first return spring 6, achieving automatic reset of the extension plate 32. When the crane operation is completed and the outrigger load decreases, under the combined action of the pre-compression buffer spring 43 and the first return spring 6, the telescopic end of the telescopic sleeve 4 retracts, and the tension of the first return spring 6 pulls the extension plate 32 back into the cavity of the support foot plate 31, restoring it to its initial compact state. The automatic reset function avoids the inconvenience of manual operation, improves the convenience and efficiency of equipment use, and ensures that the device can be reused repeatedly.

[0035] Preferred, such as Figures 1-2 As shown, several extension plates 32 are arranged in a circular array along the support foot plate 31.

[0036] In this embodiment, several extension plates 32 are arranged in a circumferential array along the support foot plate 31, achieving isotropic expansion of the support area. Regardless of the direction in which the crane boom rotates, resulting in the load being applied from which direction, the expansion of the support area is uniform and symmetrical. This avoids new instabilities that may arise due to a mismatch between the direction of support area expansion and the load direction, ensuring optimal support performance in multiple operating directions and enhancing the versatility and safety margin of the device.

[0037] Preferred, such as Figures 2-4 As shown, the expansion plate 32 is hollow inside, with a second cavity inside. A sliding plate 7 is installed in the second cavity and is vertically slidably connected to the expansion plate 32. Several limiting anchor rods 8 are arranged in an array at the bottom of the sliding plate 7. Through holes 9 matching the limiting anchor rods 8 are opened at the bottom of the expansion plate 32. A first wedge block 10 is fixedly connected to the top of the sliding plate 7. A second wedge block 11 is installed in the support foot plate 31. The second wedge block 11 and the first wedge block 10 are located on the same horizontal line. The second wedge block 11 is connected to the inner side wall of the support foot plate 31. A vertically arranged second telescopic rod 15 is fixedly connected to the top of the sliding plate 7. The top of the second telescopic rod 15 is fixedly connected to the inner side of the expansion plate 32. A second return spring 16 is sleeved on the outer side of the second telescopic rod 15. The bottom end of the second return spring 16 is fixedly connected to the sliding plate 7, and the top end is fixedly connected to the inner side of the expansion plate 32.

[0038] In this embodiment, the support device's anti-slip and anti-overturning capabilities are enhanced under heavy loads, especially in conditions with a tendency to slide. When the extension plate 32 extends outward, its internal sliding plate 7 is pressed down by the inclined surfaces of the second wedge block 11 and the first wedge block 10, forcing the limiting anchor rod 8 to penetrate the wear-resistant pad plate 13 and insert into the foundation. This is equivalent to adding a root to the support foot plate 31, providing additional horizontal grip. The anchoring action and the area expansion action are linked and are also adaptive and automatic, requiring no separate operation. While increasing the contact area, it actively improves the ultimate bearing capacity of the foundation, providing double insurance for core safety issues.

[0039] Preferred, such as Figures 2-6 As shown, a number of ball bearings 12 are embedded on the side of the support foot plate 31 that slides against the extension plate 32.

[0040] In this embodiment, ball bearings 12 are embedded in the sliding contact surface between the support foot plate 31 and the extension plate 32, significantly reducing the frictional force when the extension plate 32 slides. This makes the extension and retraction of the extension plate 32 smoother and more sensitive, reduces the risk of mechanism jamming, and ensures that the adaptive extension function can respond quickly and with low loss to load changes. The reduction in friction also reduces the demand for driving force, making the entire mechanical linkage system operate more efficiently and reliably.

[0041] Preferred, such as Figure 1 As shown, both the horizontal telescopic column 1 and the vertical telescopic column 2 are equipped with hydraulic cylinders.

[0042] In this embodiment, the horizontal and vertical telescopic columns 2 are specifically embodied as hydraulic cylinders, utilizing mature and reliable power technology. The hydraulic cylinders can provide enormous and controllable thrust and stroke, precisely controlling the extension of the outriggers and the ground pressure of the support foot plate 31. This provides a stable and powerful initial power source for subsequent adaptive area expansion, ensuring the fundamental reliability of the entire support system.

[0043] Preferred, such as Figures 2-3 As shown, the bottom of the support foot plate 31 is detachably connected to a wear-resistant pad 13, and the wear-resistant pad 13 is provided with several wear-resistant protrusions 14.

[0044] In this embodiment, a removable wear-resistant pad 13 and wear-resistant protrusions 14 are provided at the bottom of the support foot plate 31, providing double protection and enhanced wear resistance. The wear-resistant pad 13, as a consumable part, can be replaced individually, protecting the expensive support foot plate 31 body and reducing maintenance costs. The wear-resistant protrusions 14 increase friction with the ground, providing initial anti-slip capability. The rigid pad provides a reliable guide and support surface for the extension of the limiting anchor rod 8. This design extends the device's lifespan and allows it to work collaboratively with other functional modules.

[0045] The method of using the lifting machinery support device of the present invention is as follows: After moving the crane to the work site, first extend the outriggers laterally to a suitable position using the horizontal telescopic column 1 to increase the crane's support span. Then, control the vertical telescopic column 2 to move the support foot plate 31 downwards until the wear-resistant pad 13 at its bottom makes stable contact with the ground and provides stable support for the crane body.

[0046] When the crane begins lifting heavy objects and performing slewing operations, if the load on one leg increases sharply due to a shift in the center of gravity, the pressure will be transmitted to the telescopic sleeve 4. The pressure first compresses the preload buffer spring 43, and then pushes the first sleeve 41 to slide downwards within the second sleeve 42. This downward movement is converted into a thrust on the extension plate 32 through the hinge rod 34, allowing the extension plate 32 to overcome the tension of the first return spring 6 and slide smoothly out of the support foot plate 31, thereby significantly increasing the ground contact area and dispersing the pressure. At the same time, the outward sliding of the extension plate 32 will cause the first wedge block 10 inside it to slide past the second wedge block 11 inside the support foot plate 31. The inclined plane will press down the sliding plate 7, causing the limiting anchor rod 8 to penetrate the pad and insert into the ground, achieving automatic anchoring and greatly enhancing the anti-slip capability.

[0047] After the operation is completed, the crane is unloaded, and the load on the outriggers decreases. At this time, the restoring force of the pre-compression buffer spring 43 and the first return spring 6 causes the first sleeve 41 to move upward, and through the hinge rod 34 and the spring tension, the extension plate 32 is pulled back into the cavity of the support foot plate 31, restoring the compact state. During the retraction of the extension plate 32, the sliding plate 7, under the action of the second return spring 16, rises with the limiting anchor rod 8 and leaves the ground. Finally, by operating the vertical telescopic column 2 and the horizontal telescopic column 1 to retract in sequence, the crane can be transferred.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting machinery support device, characterized in that, include: A horizontal telescopic column is fixedly installed on one side of the crane car frame; A vertical telescopic column is fixedly installed on the telescopic end of the horizontal telescopic column; A telescopic sleeve, vertically installed at the bottom of the vertical telescopic column, includes a first sleeve and a second sleeve installed vertically. The first sleeve is slidably inserted into the second sleeve. The top of the first sleeve is connected to the telescopic end of the vertical telescopic column via a flange. A support foot is connected to the bottom of the second sleeve. A pre-compression buffer spring is sleeved on the first sleeve. The top of the pre-compression buffer spring is fixedly connected to the flange, and the bottom is fixedly connected to the top of the second sleeve. A support and abutment assembly, installed at the bottom end of the second sleeve, includes the support foot plate and several extension plates horizontally slidably disposed within the support foot plate. The top of the support foot plate has a first through groove along the expansion direction of the extension plates, and the second sleeve has a third through groove vertically. Each of the extension plates is hinged to the first sleeve via a hinge rod. One end of the hinge rod is placed in the first through groove and hinged to the extension plate, while the other end is placed in the third through groove and hinged to the first sleeve. The bottom of the support foot plate has a second through groove along the sliding direction of the extension plates, and the bottom of the extension plates is flush with the bottom of the support foot plate. When the first sleeve moves downward, the extension plates expand via the hinge rods, thereby increasing the effective support area of ​​the entire support foot plate.

2. The lifting machinery support device as described in claim 1, characterized in that, The bottom end of the second sleeve is fixedly connected to the inner side of the bottom of the support foot plate. The expansion plate is fixedly connected to the second sleeve through the first telescopic rod. A first return spring is sleeved on the first telescopic rod. One end of the first return spring is fixedly connected to the second sleeve, and the other end is fixedly connected to the expansion plate.

3. A lifting machinery support device as described in claim 1, characterized in that, Several of the aforementioned extension plates are arranged in a circumferential array along the support foot plate.

4. A lifting machinery support device as described in claim 1, characterized in that, The expansion plate is hollow inside, and has a second cavity inside. A sliding plate is provided in the second cavity. The sliding plate is vertically slidably connected to the expansion plate. A number of limiting anchor rods are arranged in an array at the bottom of the sliding plate. Through holes matching the number of limiting anchor rods are opened one by one at the bottom of the expansion plate.

5. A lifting machinery support device as described in claim 4, characterized in that, A first wedge block is fixedly connected to the top of the sliding plate, and a second wedge block is provided inside the support foot plate. The second wedge block and the first wedge block are located on the same horizontal line. The second wedge block is connected to the inner side wall of the support foot plate. A vertically arranged second telescopic rod is fixedly connected to the top of the sliding plate. The top of the second telescopic rod is fixedly connected to the inner side of the expansion plate. A second return spring is sleeved on the outer side of the second telescopic rod. The bottom end of the second return spring is fixedly connected to the sliding plate, and the top end is fixedly connected to the inner side of the expansion plate.

6. A lifting machinery support device as described in claim 1, characterized in that, The side of the support foot plate that slides against the extension plate is embedded with several ball bearings.

7. A lifting machinery support device as described in claim 1, characterized in that, Both the horizontal telescopic column and the vertical telescopic column are equipped with hydraulic cylinders.

8. A lifting machinery support device as described in claim 1, characterized in that, The bottom of the support foot plate is detachably connected to a wear-resistant pad, and the wear-resistant pad is provided with several wear-resistant protrusions.

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