Excavator and its chassis

Abstract

This invention discloses an excavator and its chassis in the field of excavator base plate technology, aiming to solve the problem of huge slewing resistance of the upper part when traveling on a slope in the prior art. It includes: when the road slope direction is nearly coincident with the uphill / downhill direction, the pitch cylinder extends and retracts to drive the slewing bearing mounting platform and base to pitch around the intermediate frame, reducing the angle between the slewing bearing shaft axis and the gravity direction of the upper part in one degree of freedom, thereby adjusting the slewing bearing shaft axis to nearly coincide with the gravity direction of the upper part; when a component of the road slope direction is nearly coincident with the uphill / downhill direction, and another component direction points to the left and right sides, at least two pitch cylinders extend and retract unequally to drive the slewing bearing mounting platform to tilt around the base to the left and right sides, reducing the angle between the slewing bearing shaft axis and the gravity direction of the upper part in two degrees of freedom, thereby adjusting the slewing bearing shaft axis to nearly coincide with the gravity direction of the upper part.

Description

Technical Field

[0001] This invention relates to an excavator and its chassis, belonging to the technical field of excavator base plate. Background Technology

[0002] Excavators operate under complex conditions and often work on slopes.

[0003] When excavators are turning on a slope, they sometimes experience difficulty in walking and turning, or even become unable to walk and turn. The main reason for this is that the upper part is connected to the chassis through the slewing bearing shaft. The direction of gravity of the upper part is always pointing towards the ground. When there is a slope, the slewing bearing shaft points towards the ground, which does not coincide with the direction of gravity of the upper part. This causes the pressure on the downhill side of the slewing bearing shaft to increase sharply, resulting in huge resistance to the turning of the upper part.

[0004] The key to solving the problem of increased pressure on the downhill side of the slewing bearing shaft is to address the difficulty of excavators turning on slopes. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an excavator and its chassis that allows the axis of the slewing bearing shaft to coincide with the direction of gravity of the upper part when the excavator is on a slope, thereby avoiding a surge in pressure on the downhill side of the slewing bearing shaft.

[0006] To achieve the above objectives, the embodiments of this disclosure employ the following technical solutions:

[0007] In a first aspect, embodiments of this disclosure provide an excavator chassis, including an intermediate frame, a base, and a slewing bearing mounting platform for mounting a slewing bearing shaft;

[0008] The base is rotatably connected to the intermediate frame.

[0009] The slewing bearing mounting platform is rotatably connected to the base in both directions.

[0010] At least two pitch cylinders are movably connected between the slewing bearing mounting platform and the intermediate frame. At least one pitch cylinder is provided on each of the left and right sides of the slewing bearing mounting platform. The pitch cylinders are used to adjust the angle between the slewing bearing mounting platform and the intermediate frame.

[0011] In some embodiments of the first aspect,

[0012] The rotation axis of the pitch cylinder and the slewing bearing mounting platform is parallel to the uphill and downhill directions of the excavator.

[0013] or / and,

[0014] The tilt cylinder and the rotation axis of the intermediate frame are perpendicular to the uphill and downhill directions of the excavator and parallel to the plane of the excavator chassis.

[0015] In some embodiments of the first aspect,

[0016] The pitch cylinder is provided with a tilting connection hole at one end near the slewing bearing mounting platform. The slewing bearing mounting platform is provided with a first support seat that matches the tilting connection hole. The first support seat and the tilting connection hole are rotatably connected by a first rotating shaft. The first rotating shaft is parallel to the projection of the excavator's uphill and downhill directions onto the excavator chassis plane.

[0017] or / and,

[0018] The pitch cylinder is provided with a second pitch connection hole at one end near the intermediate frame. The intermediate frame is provided with a second support seat that matches the second pitch connection hole. The second support seat and the second pitch connection hole are rotatably connected by a second rotating shaft. The second rotating shaft is perpendicular to the uphill and downhill directions of the excavator and parallel to the plane of the excavator chassis.

[0019] In some embodiments of the first aspect,

[0020] The tilt connection hole and / or the second pitch connection hole are internally fitted with a radial joint bearing.

[0021] In some embodiments of the first aspect,

[0022] The base is provided with a force transmission plate, and a third support seat matching the force transmission plate is provided in the middle frame. The third support seat and the force transmission plate are rotatably connected through a third rotating shaft.

[0023] In some embodiments of the first aspect,

[0024] The force transmission plate extends away from the pitch cylinder and the intermediate frame, and is connected to the third rotating shaft at the end of the extension.

[0025] In some embodiments of the first aspect,

[0026] The slewing bearing mounting platform has at least one fourth support seat on the side near the base, and the base has a fifth support seat that matches the fourth support seat on the side near the slewing bearing mounting platform. The fourth support seat and the fifth support seat are rotatably connected by a fourth rotating shaft.

[0027] In some embodiments of the first aspect,

[0028] The slewing bearing mounting platform is provided with a reinforcing plate on the fourth support base;

[0029] or / and,

[0030] The base has a reinforcing plate on the fifth support seat.

[0031] In some embodiments of the first aspect,

[0032] The left and right sides of the intermediate frame are slidably connected to the right longitudinal beam and the left longitudinal beam respectively via telescopic hydraulic cylinders. The telescopic hydraulic cylinders are used to adjust the distance between the right longitudinal beam and the left longitudinal beam. The right longitudinal beam and the left longitudinal beam are used to install the walking system.

[0033] Secondly, embodiments of this disclosure also provide an excavator, including the excavator chassis described in any of the first aspects.

[0034] Compared with the prior art, the beneficial effects achieved by the embodiments of this disclosure are as follows:

[0035] The excavator chassis provided in this embodiment allows for the following adjustment: When the road slope direction nearly coincides with the excavator's uphill / downhill direction, the pitch cylinder extends and retracts to drive the slewing bearing mounting platform and base to pitch around the intermediate frame, reducing the angle between the slewing bearing shaft's axis and the gravity direction of the upper part in one degree of freedom, thereby adjusting the slewing bearing shaft's axis to nearly coincide with the gravity direction of the upper part. When a portion of the road slope direction nearly coincides with the uphill / downhill direction, and another portion points to the left and right sides of the downhill direction, at least two pitch cylinders extend and retract unequally to drive the slewing bearing mounting platform to tilt around the base towards the left and right sides of the downhill direction, reducing the angle between the slewing bearing shaft's axis and the gravity direction of the upper part in two degrees of freedom, thereby adjusting the slewing bearing shaft's axis to nearly coincide with the gravity direction of the upper part. This near-coincidence of the slewing bearing shaft's axis and the gravity direction of the upper part significantly reduces the likelihood of the upper part jamming during rotation.

[0036] The excavator provided in this embodiment has the same technical effects as the excavator chassis provided in this embodiment. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the excavator chassis provided in the embodiments of this disclosure;

[0039] Figure 2 yes Figure 1 Exploded view;

[0040] Figure 3 yes Figure 1 Schematic diagram of the intermediate frame structure;

[0041] Figure 4 yes Figure 1 Schematic diagram of the middle base;

[0042] Figure 5 yes Figure 1 Schematic diagram of the structure of the slewing bearing mounting platform;

[0043] Figure 6 yes Figure 5 A structural diagram of the side of the transfer support mounting platform equipped with the fourth support seat;

[0044] Figure 7 yes Figure 1 A schematic diagram of a radial spherical bearing embedded in the tilting connection hole or the second pitching connection hole;

[0045] Figure 8 yes Figure 1 A schematic diagram of the pitching of the slewing bearing mounting platform driven by the telescopic extension and retraction of the pitch cylinder.

[0046] Figure 9 yes Figure 1 A schematic diagram showing the pitch and tilt of the slewing bearing mounting platform driven by the unequal extension and retraction of two pitch cylinders.

[0047] Figure 10 This is a schematic diagram of the structure of the excavator chassis provided in the embodiments of this disclosure;

[0048] In the picture:

[0049] 1. Frame; 2. Idler wheel; 3. Track roller; 4. Telescopic cylinder; 5. Carrier roller; 6. Motor; 7. Drive wheel; 12. Track; 1-1. Right longitudinal beam; 1-3. Left longitudinal beam;

[0050] 8. Slewing bearing shaft;

[0051] 1-2, Intermediate frame; 1-5, Base; 1-6, Slewing bearing mounting platform;

[0052] 10. Pitch cylinder; 1-11. Radial spherical bearing;

[0053] 9. First rotating shaft; 9-1. First support base; 10.1. Tilting connection hole; 10-3. Hydraulic cylinder through hole;

[0054] 11. Second rotating shaft; 11-1. Second support base; 10.2. Second pitch connection hole;

[0055] 1-8, Third support base; 1-9, Force transmission plate; 1-4, Third rotating shaft; 1-12, First pitch connection hole;

[0056] 1-7, Fourth rotating shaft; 1-7-1, Fourth support seat; 1-10, Reinforcing plate; 1-7-2, Fifth support seat;

[0057] w - downhill direction;

[0058] Figure 2 The dashed line indicates the installation relationship. Detailed Implementation

[0059] The technical solutions of this disclosure / application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure / application or its application or use.

[0060] In the following embodiments, the relationships between directions (axis, hereinafter the same), directions and surfaces, and surfaces and surfaces, such as "parallel", "coincident", "perpendicular", and "in the same plane", are described based on ideal conditions and optimal effects. In some embodiments that are closer to actual working conditions, these relationships may have errors (for example, the following embodiments mention that the projection of a certain direction on a certain surface is close to coincide with another direction, while in embodiments that are closer to actual working conditions, the projection of a certain direction on a certain surface has an angular difference with another direction, but still achieves the same function as the following embodiments), resulting in a gap between them and ideal conditions and optimal effects. However, these embodiments are still considered as variations of the embodiments of this disclosure / application. Example 1

[0061] In the prior art, when an excavator is climbing a slope, the excavator chassis plane and the slewing bearing shaft 8 located on the excavator chassis plane are nearly parallel to the ground. This results in a large angle difference between the axis of the slewing bearing shaft 8 and the direction of gravity of the upper part supported by the slewing bearing shaft 8. Consequently, the part of the slewing bearing shaft 8 away from the top of the slope is subjected to greater pressure than when traveling on a non-slope, which can cause the slewing bearing shaft 8 to jam and the slewing mechanism to be difficult to rotate. This situation is particularly pronounced when the excavator's attachments / buckets are loaded with goods.

[0062] Existing technologies often address this problem by optimizing the design of the slewing bearing shaft 8, but with little success.

[0063] In the description of this embodiment, the example is based on the conventional case where the excavator chassis plane is nearly parallel to the ground. For special excavators, when there is an angle difference between the excavator chassis plane and the ground, this embodiment should be adapted to the specific situation.

[0064] This embodiment provides an excavator chassis to solve the problem in the prior art where the direction of gravity of the upper part of the excavator does not coincide with the axis of the slewing bearing shaft 8 when the excavator travels on a slope, which makes the slewing bearing shaft 8 prone to jamming.

[0065] Optionally, in this embodiment, the downhill direction w is defined first in the uphill and downhill directions to facilitate the description of the relationship between the uphill and downhill directions and other directions, as well as the relationship between various directions, surfaces, axis lines and degrees of freedom (specifically rotational degrees of freedom). Considering that excavators can travel in both directions, and that some excavators have a reverse gear output torque greater than the first gear torque, making them more suitable for climbing, it is not difficult for those skilled in the art to see that the downhill direction w is the direction of forward or backward movement of the excavator chassis, depending on the output of the excavator chassis. For example, when the excavator is moving towards the top of the slope, the backward movement of the excavator chassis is the downhill direction w, and when the excavator is moving towards the bottom of the slope, the forward movement of the excavator chassis is the downhill direction w. Optionally, in this embodiment, for a conventional excavator chassis, the excavator chassis plane is nearly parallel to the ground when driving. At this time, the downhill direction w is parallel to the excavator chassis plane, and when the excavator is going up or down a slope, it actually points to the direction down the slope. Optionally, in some embodiments, for a special excavator chassis, the excavator chassis plane in actual geometry is not parallel to the ground. In this case, the plane that is parallel to the excavator's forward / reverse direction should be regarded as the excavator chassis plane on the hypothetical (or physical motion) level, and the downhill direction w is nearly parallel to the excavator chassis plane on the hypothetical (or physical motion) level.

[0066] Optionally, in this embodiment, left and right sides generally refer to the two sides in the uphill and downhill directions.

[0067] refer to Figures 1 to 10 The excavator chassis provided in this embodiment includes a frame 1, which includes intermediate frames 1-2. In addition to the existing technology, it also includes:

[0068] Base 1-5: The end of base 1-5 facing away from the downhill direction w is rotatably connected to the intermediate frame 1-2. The rotation axis is perpendicular to the downhill direction w and parallel to the excavator chassis plane (including near-parallel cases). The rotatable connection point between base 1-5 and intermediate frame 1-2 serves as the rotation fulcrum of the slewing bearing mounting platform 1-6 during pitching. The rotation axis, perpendicular to the downhill direction w and parallel to the excavator chassis plane, satisfies the rotational freedom of base 1-5 in the pitch plane (parallel to the downhill direction w and perpendicular to the ground).

[0069] Slewing bearing mounting platform 1-6 for connection with slewing bearing shaft 8: Slewing bearing mounting platform 1-6 is rotatably connected to base 1-5, and the rotation shaft is parallel (including near parallel) to the projection of the downhill direction w onto the excavator chassis plane. The rotational connection point between the slewing bearing mounting platform 1-6 and the base 1-5 will serve as the rotational fulcrum when the slewing bearing mounting platform 1-6 tilts to either side of the downhill direction w. The rotation axis is parallel to the projection of the downhill direction w onto the excavator chassis plane, satisfying the rotational freedom of the slewing bearing mounting platform 1-6 on the tilting plane (which changes with the pitch of the base 1-5, is perpendicular to the projection perpendicular to the downhill direction w on the excavator chassis plane, and intersects the ground). Furthermore, the rotational axis of the base 1-5 and the intermediate frame 1-2 is perpendicular to the rotational axis of the slewing bearing mounting platform 1-6 and the base 1-5. Therefore, pitch and tilt do not interfere with each other. The slewing bearing mounting platform 1-6 is also driven by the base 1-5 and thus pitches around the intermediate frame 1-2. Therefore, when pitch and tilt occur simultaneously, the slewing bearing mounting platform 1-6 rotates on two planes. The axis of the slewing bearing shaft 8 connected to the slewing bearing mounting platform 1-6 is thus adjustable.

[0070] Those skilled in the art will readily recognize that the downhill direction w generally refers to the two sides of the excavator or the two sides of the driving route.

[0071] To accommodate pitch and tilt movements, the end of the slewing bearing mounting platform 1-6 closest to the downhill direction w is connected to the intermediate frame 1-2 via at least two pitch cylinders 10. The two ends of the pitch cylinders 10 are movably connected to the slewing bearing mounting platform 1-6 and the intermediate frame 1-2, respectively. At least two pitch cylinders 10 are respectively located on the left and right sides of the slewing bearing mounting platform 1-6.

[0072] Optionally, in this embodiment, reference is made to... Figure 1 Taking the minimum of two pitch cylinders 10 as an example, in the case of more pitch cylinders 10, the two pitch cylinders 10 are respectively located on the left and right sides of the slewing bearing mounting platform 1-6, and at least one pitch cylinder 10 is provided on each of the left and right sides of the slewing bearing mounting platform 1-6. Optionally, in this embodiment, the two pitch cylinders 10 are also respectively located on the left and right sides of the intermediate frame 1-2. For the same principle, it will not be described again here.

[0073] The pitch cylinder 10 changes the cylinder stroke to control the pitch of the slewing bearing mounting platform 1-6 and the base 1-5 around the intermediate frame 1-2. The two pitch cylinders 10 generate a cylinder stroke difference to control the tilt of the slewing bearing mounting platform 1-6 around the base 1-5 in the downward slope direction w.

[0074] For example, when the downhill direction (w) and the slope direction of travel are basically coincident, the excavator moves uphill / downhill, referring to... Figure 8Arrows are marked on the pitch cylinder 10. The pitch cylinder 10 extends by the same stroke at the same time. The rotation connection point between the base 1-5 and the intermediate frame 1-2 is used as the rotation fulcrum of the slewing bearing mounting platform 1-6 when pitching. The pitch cylinder 10 drives the end of the slewing bearing mounting platform 1-6 away from the rotation fulcrum to lift away from the ground. (At this time, the slewing bearing mounting platform 1-6 also drives the base 1-5 to lift through the connection point.) The plane of the slewing bearing mounting platform 1-6 gradually becomes parallel to the horizontal plane. The axis of the slewing bearing shaft 8 gradually changes from being nearly perpendicular to the ground to gradually coinciding with the direction of gravity of the upper part.

[0075] For example, when there is an angle difference between the downhill direction w and the downhill direction w of the driving slope, or when the excavator is traveling in a zigzag path uphill / downhill, refer to... Figure 9 The different arrows marked on the pitch cylinder 10 indicate that the two pitch cylinders 10 have different extension and retraction lengths. This causes the axis of the slewing bearing shaft 8 to gradually "turn towards" the side of the pitch cylinder 10 with the shorter extension and retraction, thereby achieving the tilting and pitching of the slewing bearing mounting platform 1-6 (the base 1-5 only undergoes pitching changes). The plane of the slewing bearing mounting platform 1-6 gradually becomes parallel to the horizontal plane, so that the axis of the slewing bearing shaft 8 coincides with the direction of gravity of the upper part.

[0076] The alignment of the axis of the slewing bearing shaft 8 with the direction of gravity of the upper part ensures that the force on each part of the slewing bearing shaft 8 is uniform, restoring it to the state of smooth, non-slope driving. At this time, the upper part can rotate normally.

[0077] Optionally, in this embodiment, the two (or more) pitch cylinders 10 are distributed perpendicular to the downhill direction w.

[0078] Optionally, in some embodiments, the rotatable connection methods include: pins, bearings, ball-and-groove joints, flexible deformation rotation, etc.

[0079] Optionally, in some embodiments, the active connection methods include: pins, bearings, ball-groove joints, flexible deformation motion, etc.

[0080] Optionally, in some embodiments, the movable connection may not be a rotating connection. Instead, it may be a sliding connection between the intermediate frame 1-2 and the pitch cylinder 10 at the intermediate frame 1-2, or a sliding connection between the slewing bearing mounting platform 1-6 and the pitch cylinder 10 at the slewing bearing mounting platform 1-6. The projection of the slide rail on the excavator chassis plane is parallel to the downhill direction w.

[0081] It is easy to see that, in addition to the advantages mentioned above, the excavator chassis provided in this embodiment only requires two pitch cylinders 10 to complete the movement of the main functions. Therefore, the control difficulty (the electronic / hydraulic control system only needs to consider the extension and retraction of two cylinders), structure and cylinder procurement cost are low. Example 2

[0082] This embodiment provides an excavator chassis, which is an improvement on the technology of Embodiment 1 to optimize the technical effect. For details not covered, please refer to Embodiment 1. Similarly, in the description of this embodiment, coincidence includes near coincidence, perpendicularity includes near perpendicularity, parallelism includes near parallelism, and so on, which will not be repeated here.

[0083] As mentioned in Embodiment 1, the two ends of the pitch cylinder 10 are movably connected to the slewing bearing mounting platform 1-6 and the intermediate frame 1-2, respectively. Considering that when the pitch cylinder 10 extends to drive the slewing bearing mounting platform 1-6 to pitch relative to the intermediate frame 1-2, the connection points between the pitch cylinder 10 and the slewing bearing mounting platform 1-6, and between the pitch cylinder 10 and the intermediate frame 1-2, mainly rotate, therefore, referring to... Figure 1 Optionally, in this embodiment, the end of the pitch cylinder 10 near the slewing bearing mounting platform 1-6 is rotatably connected to the slewing bearing mounting platform 1-6, and the rotation axis is parallel to the projection of the downhill direction w onto the excavator chassis plane. Figure 9 With the rotation axis arranged in this way, the tilting of each pitch cylinder 10 and the slewing bearing mounting platform 1-6 in the downward slope direction w can be satisfied when the two pitch cylinders 10 drive the slewing bearing mounting platform 1-6 to tilt.

[0084] or / and,

[0085] The end of the pitch cylinder 10 near the intermediate frame 1-2 is rotatably connected to the intermediate frame 1-2. The rotation axis is perpendicular to the downhill direction w and parallel to the plane of the excavator chassis. (See reference) Figure 8 Since the rotational connection point between the pitch cylinder 10 and the slewing bearing mounting platform 1-6 is fixed in this embodiment, the pitch cylinder 10 is constrained by the triangular relationship of the intermediate frame 1-2, the pitch cylinder 10, and the slewing bearing mounting platform 1-6 (including the base 1-5), causing the pitch cylinder 10 to produce a pitching motion relative to the intermediate frame 1-2. The rotation axis arranged with this axis can satisfy the pitching rotation of the pitch cylinder 10 around the rotational connection point relative to the intermediate frame 1-2 when the slewing bearing mounting platform 1-6 pitches relative to the intermediate frame 1-2.

[0086] Optionally, in this embodiment, the above-mentioned rotating connection scheme can be extended to:

[0087] refer to Figure 2 The pitch cylinder 10 has a tilt connection hole 10.1 at one end near the slewing bearing mounting platform 1-6, for reference. Figure 2 and Figure 5The slewing bearing mounting platform 1-6 is provided with a first support seat 9-1 that matches the tilting connection hole 10.1. The first support seat 9-1 and the tilting connection hole 10.1 are rotatably connected by a first rotating shaft 9. The rotating shaft is parallel to the projection of the downhill direction w onto the excavator chassis plane.

[0088] or / and,

[0089] refer to Figure 2 The pitch cylinder 10 has a second pitch connection hole 10.2 at one end near the intermediate frame 1-2, for reference. Figure 2 and Figure 3 The intermediate frame 1-2 is provided with a second support seat 11-1 that matches the second pitch connection hole 10.2. The second support seat 11-1 and the second pitch connection hole 10.2 are rotatably connected by a second rotating shaft 11. The rotating shaft is perpendicular to the downhill direction w and parallel to the plane of the excavator chassis.

[0090] Optionally, in this embodiment, the first support 9-1 and the second support 11-1 are double-layer perforated plates.

[0091] Since the projections of the centerlines of the two rotating connection points onto the excavator chassis plane intersect, considering that when the slewing bearing mounting platform 1-6 tilts, the centerline of the second pitch connection hole 10.2 is inclined to the centerline of the second rotating shaft 11; similarly, when the slewing bearing mounting platform 1-6 pitches, the centerline of the tilt connection hole 10.1 is inclined to the centerline of the first rotating shaft 9; optionally, in this embodiment, referring to... Figure 7 A radial spherical bearing 1-11 is embedded inside the tilt connection hole 10.1 or / and the second pitch connection hole 10.2. The first rotating shaft 9 or the second rotating shaft 11 is then fitted inside the radial spherical bearing 1-11 to avoid jamming caused by the misalignment of the center lines of the shaft and the shaft hole.

[0092] Optionally, in some embodiments, the radial joint bearing 1-11 allows the axis of the second pitch connection hole 10.2 to be tilted by 8° with the axis of the second rotation shaft 11, and the axis of the tilt connection hole 10.1 to be tilted by 8° with the axis of the first rotation shaft 9.

[0093] As mentioned in Embodiment 1, the base 1-5 is rotatably connected to the intermediate frame 1-2 at the end opposite to the downhill direction w. Optionally, in this embodiment, the base 1-5 is provided with at least two force transmission plates 1-9 at the end opposite to the downhill direction w, and the intermediate frame 1-2 is provided with a third support seat 1-8 that matches the force transmission plates 1-9. The third support seat 1-8 and the force transmission plates 1-9 are rotatably connected through a third rotating shaft 1-4.

[0094] Optionally, in this embodiment, the third support 1-8 is a double-layer perforated plate.

[0095] Optionally, in this embodiment, reference is made to... Figure 2 The third support 1-8 has a first pitch connection hole 1-12 between the double-layer perforated plates, and the third rotating shaft 1-4 can be fitted into the first pitch connection hole 1-12.

[0096] refer to Figure 2 Optionally, in this embodiment, the force transmission plate 1-9 extends away from the pitch cylinder 10 and the intermediate frame 1-2, and connects to the third rotating shaft 1-4 at the end of the extension. This extends the distance from the third rotating shaft 1-4 to the pitch cylinder 10, increasing the lever arm of the pitch cylinder 10; the third rotating shaft 1-4 is further away from the ground than the base 1-5 and is higher than the excavator's travel system, facilitating the assembly and disassembly of the third rotating shaft 1-4.

[0097] Optionally, in some embodiments, the pitch cylinder 10 extends to raise the slewing bearing mounting platform 1-6 and the base 1-5 by more than 15° relative to the intermediate frame 1-2.

[0098] Optionally, in some embodiments, the two pitch cylinders 10 contract unequally, causing the slewing bearing mounting platform 1-6 to tilt more than 12° around the base 1-5.

[0099] As mentioned in Embodiment 1, the slewing bearing mounting platform 1-6 is rotatably connected to the base 1-5. Optionally, in this embodiment, refer to... Figure 2 , Figure 4 and Figure 6 The slewing bearing mounting platform 1-6 is provided with at least one fourth support seat 1-7-1 on the side near the base 1-5, and the base 1-5 is provided with a fifth support seat 1-7-2 that matches the fourth support seat 1-7-1 on the side near the slewing bearing mounting platform 1-6. The fourth support seat 1-7-1 and the fifth support seat 1-7-2 are rotatably connected by a fourth rotating shaft 1-7.

[0100] Optionally, in this embodiment, two fourth support bases 1-7-1 and five support bases 1-7-2 are arranged correspondingly to each other. Both the fourth support base 1-7-1 and the fifth support base 1-7-2 are double-layer perforated plates, and the distance between the fourth rotating shaft 1-7 and the slewing bearing mounting platform 1-6 and the base 1-5 is increased as much as possible, so as to increase the tilting angle range of the slewing bearing mounting platform 1-6 relative to the base 1-5.

[0101] As mentioned above, the distance between the fourth rotating shaft 1-7 and the slewing bearing mounting platform 1-6 and base 1-5 should be increased as much as possible. Considering the large weight of the upper part, the roots of the fourth support 1-7-1 and the fifth support 1-7-2 may experience significant stress. To disperse the stress at the roots of the fourth support 1-7-1 and the fifth support 1-7-2, optionally, in this embodiment, refer to... Figure 2 , Figure 4 and Figure 6 The fourth support 1-7-1 is connected to one side of the reinforcing plate 1-10, and the other side of the reinforcing plate 1-10 extends toward the edge of the slewing bearing mounting platform 1-6.

[0102] or / and,

[0103] The fifth support 1-7-2 is connected to one side of the reinforcing plate 1-10, and the other side of the reinforcing plate 1-10 extends toward the edge of the base 1-5; the reinforcing plate 1-10 also facilitates tilting movement.

[0104] Optionally, in this embodiment, the reinforcing plates 1-10 are triangular reinforcing plates.

[0105] Optionally, in this embodiment, reference is made to... Figure 1 The intermediate frame 1-2 is slidably connected to the right longitudinal beam 1-1 and the left longitudinal beam 1-3 on both sides of the downhill direction w via telescopic cylinders 4. The telescopic cylinders 4 are used to adjust the distance between the right longitudinal beam 1-1 and the left longitudinal beam 1-3. The right longitudinal beam 1-1 and the left longitudinal beam 1-3 are used to install the walking system, thereby adjusting the distance between the left and right walking systems to adapt to roads of different widths.

[0106] Optionally, in this embodiment, reference is made to... Figure 1 The right longitudinal beam 1-1 and the left longitudinal beam 1-3 are equipped with a guide wheel 2, a support roller 3, a chain roller 5, a motor 6, a drive wheel 7 and a track 12.

[0107] When traveling on non-slope sections, the pitch cylinder 10 maintains its default retracted state, making the slewing bearing mounting platform 1-6 and the slewing bearing shaft 8 mounted on it parallel to the ground, so that the axis of the slewing bearing shaft 8 is nearly perpendicular to the ground and coincides with the direction of gravity of the upper part of the vehicle.

[0108] Optionally, in this embodiment, the slewing bearing shaft 8 is connected to the frame 1 (slewing bearing mounting platform 1-6) and the upper part of the vehicle by bolts.

[0109] Optionally, in this embodiment, reference is made to... Figure 2 and Figure 3 The intermediate frame 1-2 is a double-wing structure, with the double wings inserted into the right longitudinal beam 1-1 and the left longitudinal beam 1-3.

[0110] Optionally, in this embodiment, the shape of the base plate 1-5 is adapted to the top plate of the intermediate frame 1-2.

[0111] Optionally, in this embodiment, the slewing bearing mounting platform 1-6 is composed of a top plate, horizontal ribs, and vertical ribs welded together.

[0112] Optionally, in this embodiment, reference is made to... Figure 5 and Figure 6 The slewing bearing mounting platform 1-6 has a cylinder through hole 10-3 for the pitch cylinder 10. Example 3

[0113] This embodiment provides an excavator, including the excavator chassis provided in Embodiment 1 or 2 and other embodiments not mentioned. For the technical solutions and effects, please refer to Embodiment 1 or 2, which will not be repeated here.

[0114] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0115] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," "equipped with," "located in," "installed," "set," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0116] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An excavator chassis, including a middle frame (1-2), characterized in that, It also includes a base (1-5) and a slewing bearing mounting platform (1-6) for mounting the slewing bearing shaft (8). The base (1-5) and the intermediate frame (1-2) are rotatably connected. The slewing bearing mounting platform (1-6) is rotatably connected to the base (1-5) in the left and right directions; At least two pitch cylinders (10) are movably connected between the slewing bearing mounting platform (1-6) and the intermediate frame (1-2). At least one pitch cylinder (10) is provided on each of the left and right sides of the slewing bearing mounting platform (1-6). The pitch cylinders (10) are used to adjust the angle between the slewing bearing mounting platform (1-6) and the intermediate frame (1-2). The rotation axes of the pitch cylinder (10) and the slewing bearing mounting platform (1-6) are parallel to the uphill and downhill directions of the excavator. or / and, The rotation axis of the pitch cylinder (10) and the intermediate frame (1-2) is perpendicular to the uphill and downhill directions of the excavator and parallel to the plane of the excavator chassis; The pitch cylinder (10) is provided with a tilting connection hole (10.1) at one end near the slewing bearing mounting platform (1-6). The slewing bearing mounting platform (1-6) is provided with a first support seat (9-1) that matches the tilting connection hole (10.1). The first support seat (9-1) and the tilting connection hole (10.1) are rotatably connected by a first rotating shaft (9). The first rotating shaft (9) is parallel to the projection of the excavator's uphill and downhill directions onto the excavator chassis plane. or / and, The pitch cylinder (10) is provided with a second pitch connection hole (10.2) at one end near the intermediate frame (1-2). The intermediate frame (1-2) is provided with a second support seat (11-1) that matches the second pitch connection hole (10.2). The second support seat (11-1) and the second pitch connection hole (10.2) are rotatably connected by a second rotating shaft (11). The second rotating shaft (11) is perpendicular to the uphill and downhill directions of the excavator and parallel to the plane of the excavator chassis. The tilt connection hole (10.1) and / or the second pitch connection hole (10.2) are internally fitted with a radial spherical bearing (1-11).

2. The excavator chassis according to claim 1, characterized in that, The base (1-5) is provided with a force transmission plate (1-9), and the intermediate frame (1-2) is provided with a third support seat (1-8) that matches the force transmission plate (1-9). The third support seat (1-8) and the force transmission plate (1-9) are rotatably connected through a third rotating shaft (1-4).

3. The excavator chassis according to claim 2, characterized in that, The force transmission plate (1-9) extends away from the pitch cylinder (10) and the intermediate frame (1-2), and is connected to the third rotating shaft (1-4) at the end of the extension.

4. The excavator chassis according to claim 1, characterized in that, The slewing bearing mounting platform (1-6) has at least one fourth support seat (1-7-1) on the side near the base (1-5), and the base (1-5) has a fifth support seat (1-7-2) that matches the fourth support seat (1-7-1) on the side near the slewing bearing mounting platform (1-6). The fourth support seat (1-7-1) and the fifth support seat (1-7-2) are rotatably connected by a fourth rotating shaft (1-7).

5. The excavator chassis according to claim 4, characterized in that, The slewing bearing mounting platform (1-6) is provided with a reinforcing plate (1-10) on the fourth support base (1-7-1). or / and, The base (1-5) is provided with a reinforcing plate (1-10) on the fifth support (1-7-2).

6. The excavator chassis according to any one of claims 1 to 5, characterized in that, The left and right sides of the intermediate frame (1-2) are slidably connected to the right longitudinal beam (1-1) and the left longitudinal beam (1-3) respectively via telescopic cylinders (4). The telescopic cylinders (4) are used to adjust the distance between the right longitudinal beam (1-1) and the left longitudinal beam (1-3). The right longitudinal beam (1-1) and the left longitudinal beam (1-3) are used to install the walking system.

7. An excavator, characterized in that, Includes the excavator chassis as described in any one of claims 1 to 6.

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