A crawler floor crane

Abstract

The present invention relates to the technical field of engineering machinery, and specifically to a crawler-type floor crane, comprising a base frame formed by welding a support plate body on two main beams, and a lifting arm and a hydraulic station arranged on the main beams. Two first crawler wheels are symmetrically installed on one side of the base frame through a first wheel frame, and two second crawler wheels are symmetrically installed on the other side through a lifting mechanism. An auxiliary steering mechanism is installed below the base frame near the second crawler wheels through a swing arm type adjustment mechanism. The swing arm type adjustment mechanism is linked with the lifting mechanism. When the swing arm type adjustment mechanism drives the auxiliary steering mechanism to swing downward until it contacts the ground, the linkage lifting mechanism drives the two second crawler wheels to move upward and separate from the ground. The auxiliary steering mechanism includes a second mounting frame, a drive assembly, and a steering wheel. The present invention realizes four-wheel stable steering by switching the hydraulic linkage between the steering wheel and the second crawler wheel. The counterweight body can adjust its position along the slide rail to dynamically balance the hoisting torque.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a crawler-type floor crane. Background Art

[0002] Crawler floor crane is a floor lifting equipment with crawler chassis as the walking device. It is designed specifically for operations on the floors or top floors of high-rise buildings. Combining the tower body and lifting arm structure, it uses hydraulic or electric power systems to achieve vertical lifting and horizontal movement of heavy objects. It can be easily transferred between different work points on the floor. It has the characteristics of small footprint, strong terrain adaptability, and easy installation and disassembly. It is especially suitable for building material transportation, equipment lifting and material lifting tasks in confined spaces during the later construction of high-rise buildings.

[0003] The crawler floor crane in the existing technology has only two crawler running wheels. The contact area between the double crawler running wheels and the ground is small, and the stability of the whole machine is insufficient. When lifting heavy objects, it needs to rely on support legs for auxiliary stability, which makes the operation process more cumbersome and has higher requirements for floor flatness.

[0004] Furthermore, the steering mechanism of the two crawler wheels achieves steering by controlling the speed difference between the two tracks. This means that the drive device adjusts the operating speed of the left and right tracks. When the two tracks advance at different speeds, a steering torque is generated to steer the equipment. Under heavy loads, this steering mechanism is prone to significant shaking during steering due to torque imbalance, resulting in poor steering accuracy and operational smoothness. Furthermore, the concentrated ground pressure can increase the burden on the floor structure, potentially damaging it. Summary of the Invention

[0005] The purpose of the present invention is to provide a crawler floor crane to solve the technical problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] The two wheels are symmetrically mounted on the lower side of the base frame through a first wheel frame, and two second wheels are symmetrically mounted on the other side of the base frame through a lifting mechanism. An auxiliary steering mechanism is installed below the base frame near the second wheel frame through a swing arm adjustment mechanism. The swing arm adjustment mechanism is linked with the oil circuit of the lifting mechanism. When the swing arm adjustment mechanism drives the auxiliary steering mechanism to swing downward to contact the ground, the linkage lifting mechanism drives the two second wheel frames to move upward and separate from the ground. The auxiliary steering mechanism includes a second mounting frame provided on the swing end of the swing arm adjustment mechanism, a driving assembly provided on the second mounting frame, and steering wheels respectively arranged on both sides of the second mounting frame. The driving assembly is used to drive the two steering wheels to deflect synchronously to assist in reversing. When the swing arm adjustment mechanism drives the auxiliary steering mechanism to swing downward to contact the steering wheel with the ground, the linkage lifting mechanism drives the two second wheel frames to move upward and be stored.

[0008] When the swing-arm adjustment mechanism drives the auxiliary steering mechanism to swing downward until it contacts the ground, the lifting mechanism drives the two second track wheels to move upward and separate from the ground through the hydraulic linkage mechanism. At this time, the steering wheel serves as the front wheel and forms a four-wheel support structure with the first track wheel. The drive assembly drives the two steering wheels to deflect synchronously to ensure torque balance during the steering process, reduce steering shake under heavy load conditions, reduce damage to the floor structure caused by concentrated ground pressure, and improve steering accuracy and operational smoothness.

[0009] Preferably, the swing-arm type adjustment mechanism includes a pair of second hydraulic cylinders, an axle rod and a pair of traction swing arms. A crossbeam and a T-shaped frame are fixed between the two main beams. The axle rod is rotatably mounted on the T-shaped frame. The middle parts of the two traction swing arms are respectively fixed on both sides of the axle rod. The cylinder ends of the two second hydraulic cylinders are hingedly mounted on the crossbeam, and the other ends are respectively hinged to one end of the corresponding traction swing arm. The other ends of the two traction swing arms are correspondingly fixed with a second mounting frame.

[0010] Preferably, the lifting mechanism includes a first hydraulic cylinder, a first mounting frame is fixed between the two main beams, the first hydraulic cylinder is fixed vertically downward on the first mounting frame, a second wheel frame is fixed to the telescopic end of the first hydraulic cylinder, and two second track wheels are respectively arranged on both sides of the second wheel frame.

[0011] Preferably, the end of the first hydraulic cylinder and the second hydraulic cylinder through which the piston rod passes is defined as the telescopic side, wherein the oil inlet and outlet C on the cylinder body of one of the second hydraulic cylinders close to the telescopic side is connected to the oil inlet and outlet A on the cylinder body of the first hydraulic cylinder away from the telescopic side through a first conduit, the other oil inlet and outlet C on the cylinder body of the second hydraulic cylinder is connected to the hydraulic station through a third conduit, and the other oil inlet and outlet A on the cylinder body of the first hydraulic cylinder is connected to the hydraulic station through a second conduit.

[0012] Preferably, the drive assembly includes a piston cylinder, a piston body and a traction rod. A rotating seat is rotatably installed on both sides of the second mounting frame through a rotating shaft. The two steering wheels are rotatably installed on the disc seats on the corresponding side rotating seats. The piston cylinder is fixed on the second mounting frame. The two oil inlets and outlets B thereon are respectively connected to the hydraulic station through pipelines. The piston body is adapted to be installed in the piston cylinder. The traction rod is fixed to the piston body and extends to the outside of the piston cylinder at both ends. The traction arms are hingedly installed at both ends of the traction rod, and the other ends of the two traction arms are hinged to the convex arms on the corresponding side rotating seats.

[0013] Preferably, a placement plate is arranged on a side of the base frame away from the lifting boom, and a plurality of counterweights are arranged above the placement plate.

[0014] Preferably, both base frames are fixed with slide rails extending along their length directions, both slide rails are slidably mounted with slide seats, counterweights are fixed above the two slide seats, and third hydraulic cylinders are respectively mounted via brackets on the sides of the two base frames away from each other, both third hydraulic cylinders extend along the length direction of the main beam, and the telescopic ends of the two third hydraulic cylinders are fixedly connected to the slide seats on the corresponding sides through connecting arms.

[0015] Preferably, the first mounting frame is provided with U-shaped sinking sections on both sides of the first hydraulic cylinder, each of the two U-shaped sinking sections has a sliding hole, and two vertically extending guide rods are fixed on the second wheel frame, and the two guide rods are slidably inserted into the sliding holes one by one.

[0016] Preferably, the first mounting frame is arranged below the placement plate, and when the first hydraulic cylinder retracts to drive the second wheel frame to move to the extreme position, the top surfaces of the two guide rods are lower than the lower surface of the placement plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] The symmetrical arrangement of the first and second track wheels forms a four-point crawler walking structure. Compared with the traditional double-track structure, it can increase the contact area between the entire machine and the ground, effectively enhance the support stability during operation, reduce the dependence on the support legs when lifting heavy objects, reduce the stringent requirements for floor flatness, and adapt to complex floor construction environments.

[0019] When the swing-arm adjustment mechanism drives the auxiliary steering mechanism to swing downward until it contacts the ground, the lifting mechanism drives the two second track wheels to move upward and separate from the ground through the hydraulic linkage mechanism. At this time, the steering wheel serves as the front wheel and forms a four-wheel support structure with the first track wheel. The drive assembly drives the two steering wheels to deflect synchronously to ensure torque balance during the steering process, reduce steering shake under heavy load conditions, reduce damage to the floor structure caused by concentrated ground pressure, and improve steering accuracy and operational smoothness.

[0020] The second hydraulic cylinder is connected to the first hydraulic cylinder via a first conduit and other oil circuits, forming a hydraulic linkage mechanism. The oil inlet and outlet of the two cylinders are connected to the hydraulic station through the first, second, and third conduits, forming a closed-loop oil circuit system, achieving synchronous linkage of the two extension and retraction movements. This design reduces the number of hydraulic components and the complexity of the oil circuit layout, avoiding posture deviation and power loss caused by asynchronous movement, making the system more responsive, and ensuring efficient and consistent up and down operations of the second track wheel and the auxiliary steering mechanism.

[0021] The counterweight body is able to adjust its distance from the crane arm in real time according to the inclination angle of the crane arm through an adjustable mechanism composed of slide rails, slide seats, and the third hydraulic cylinder. When the inclination angle of the crane arm increases, the third hydraulic cylinder retracts and drives the counterweight body close to the crane arm. The lever principle is used to offset the counterweight torque and the boom load torque, thereby improving the anti-overturning ability, balancing the pressure distribution of the fuselage on the floor, reducing structural damage caused by local pressure concentration, and adapting to different lifting conditions and transfer requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the partial structure of the crawler floor crane;

[0023] Figure 2 for Figure 1 The schematic diagram of the local structure shown;

[0024] Figure 3 It is a schematic diagram of the local structure on one side of the base frame in the present invention;

[0025] Figure 4 This is a schematic diagram of the installation of the second track wheel structure;

[0026] Figure 5 It is a partial structural diagram of the auxiliary steering mechanism and the swing arm type adjustment mechanism;

[0027] Figure 6 for Figure 5 The schematic diagram of the local structure shown;

[0028] Figure 7 This is a schematic diagram of the oil circuit connection between the first hydraulic cylinder and the second hydraulic cylinder;

[0029] Figure 8 Detailed structural diagram of the auxiliary steering mechanism in the present invention;

[0030] Figure 9 This is a schematic diagram of the interior of the piston cylinder in the present invention;

[0031] Figure 10 Detailed structural diagram of the lifting mechanism in the present invention;

[0032] Figure 11 for Figure 10A schematic diagram of the structure at center A;

[0033] Figure 12 This is a schematic diagram of the counterweight structure arrangement in the present invention.

[0034] In the figure: 01, lifting boom; 02, telescopic side; 03, first guide tube; 04, second guide tube; 05, third guide tube; 1, base frame; 11, main beam; 12, support plate; 2, first track wheel; 21, first wheel frame; 3, second track wheel; 31, second wheel frame; 4, lifting mechanism; 41, first mounting frame; 411, U-shaped sinking section; 412, sliding hole; 42, first hydraulic cylinder; 421, oil inlet and outlet A; 43, guide rod; 5, auxiliary steering mechanism; 51, steering wheel; 52, second Mounting frame; 521, rotating shaft; 53, piston cylinder; 531, oil inlet and outlet B; 54, piston body; 55, traction rod; 56, rotating seat; 561, disc seat; 562, protruding arm; 57, traction arm; 6, swing-arm type adjustment mechanism; 61, crossbeam; 62, second hydraulic cylinder; 621, oil inlet and outlet C; 63, T-shaped frame; 64, shaft; 65, traction swing arm; 7, counterweight; 71, placement plate; 8, hydraulic station; 9, slide rail; 91, slide seat; 92, third hydraulic cylinder; 93, connecting arm. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0036] Example 1

[0037] See also Figures 1-12 The present invention provides a crawler floor crane, including a lifting boom 01, a base frame 1 and a hydraulic station 8, wherein the base frame 1 includes a main beam 11 and a support plate 12, the two main beams 11 are arranged in parallel, and the two are fixed by welding a plurality of supporting beams (not shown in the figure), the support plate 12 is fixed on the top of the two main beams 11, the lifting boom 01 is hingedly set on one side of the support plate 12, and the hydraulic station 8 is set on the other side of the support plate 12. The hydraulic station 8 serves as a hydraulic adjustment system to provide power and control for the various hydraulic drive components in this application. The hydraulic station 8 adopts existing technology, so the specific structure and principle will not be described in detail.

[0038] The support plate 12 is also provided with a traction device for pulling the lifting boom 01 to swing to control the lifting inclination angle. At the same time, the support plate 12 is also equipped with a winch. The noose on the winch passes through the pulley device set at the top of the lifting boom 01 and the pulley set on the hook to control the lifting and lowering of the hook. The traction device, winch, noose, pulley device, hook and pulley all adopt existing technology to form a lifting system. The specific lifting principle will not be described in detail.

[0039] like Figure 1 and Figure 2 As shown, two first track wheels 2 are symmetrically installed on one side below the base frame 1 through the first wheel frame 21. Specifically, the first wheel frame 21 is fixed to one side below the two main beams 11, and the two first track wheels 2 are respectively installed on both sides of the first wheel frame 21. Two second track wheels 3 are symmetrically installed on the side below the base frame 1 away from the first wheel frame 21 through the lifting mechanism 4. Specifically, the lifting mechanism 4 is arranged on the side below the two main beams 11 away from the first wheel frame 21, and the two second track wheels 3 are installed on both sides below the lifting mechanism 4. The first track wheel 2 and the second track wheel 3 both adopt the existing crawler walking structure. The specific structure and walking principle will not be described in detail, and it can adapt to complex floor construction environment.

[0040] The crane body is composed of two main beams 11 and a support plate 12. Compared with a traditional crane, the body is longer and more stable. In addition, the first track wheel 2 and the second track wheel 3 are symmetrically arranged on the side of the body to form a four-point crawler walking structure. Compared with a traditional two-track-wheel crane, the walking support area is larger and the overall posture stability is higher.

[0041] An auxiliary steering mechanism 5 is installed near the second track wheel 3 below the base frame 1 through a swing arm type adjustment mechanism 6. The swing arm type adjustment mechanism 6 is linked with the oil circuit of the lifting mechanism 4. Specifically, Figure 6 and Figure 8 As shown, the auxiliary steering mechanism 5 includes a second mounting frame 52 provided on the swing end of the swing arm type adjustment mechanism 6, a driving assembly provided on the second mounting frame 52, and steering wheels 51 respectively arranged on both sides of the second mounting frame 52, wherein the driving assembly is used to drive the two steering wheels 51 to deflect synchronously to assist in reversing. When the swing arm type adjustment mechanism 6 drives the auxiliary steering mechanism 5 to swing downward so that the steering wheel 51 contacts the ground, the linkage lifting mechanism 4 drives the two second track wheels 3 to move upward for storage.

[0042] When the swing arm type adjustment mechanism 6 works and drives the auxiliary steering mechanism 5 to swing downward until it contacts the ground, the swing arm type adjustment mechanism 6 can simultaneously link the lifting mechanism 4 to drive the two second track wheels 3 to move up and separate from the ground. At this time, the two steering wheels 51 serve as the front wheels of the vehicle body and support the ground. The two steering wheels 51 are driven by the driving component to deflect synchronously. The first track wheel 2 is used as the rear driving wheel to assist the vehicle body in steering. The steering is not only highly stable, but also more flexible and accurate, and can reduce damage to the floor structure.

[0043] In addition, the swing-arm adjustment mechanism 6 drives the steering wheel 51 downward to contact the ground, which in turn links the two second track wheels 3 to move upward, so that the steering wheel 51 replaces the second track wheel 3 and forms a stable four-wheel structure with the first track wheel 2, effectively ensuring the levelness of the vehicle body and avoiding the vehicle body from tilting and affecting the stability during steering. On the other hand, it can avoid contact friction between the second track wheel 3 and the ground, further reducing damage to the floor structure.

[0044] Example 2

[0045] See also Figure 3-Figure 8 The difference between this embodiment and embodiment 1 is that:

[0046] The swing-arm adjustment mechanism 6 includes a pair of second hydraulic cylinders 62, a shaft 64 and a pair of traction swing arms 65. A crossbeam 61 and a T-shaped frame 63 are fixed between the two main beams 11. The shaft 64 is rotatably mounted on the T-shaped frame 63. The middle parts of the two traction swing arms 65 are respectively fixedly mounted on both sides of the shaft 64. The cylinder ends of the two second hydraulic cylinders 62 are hingedly mounted on the crossbeam 61, and the other ends are respectively hinged to one end of the corresponding traction swing arm 65, so that the second hydraulic cylinders 62 can swing adaptively during driving to avoid motion jamming. The second mounting frame 52 is fixed to the other end of the two traction swing arms 65.

[0047] As the second hydraulic cylinder 62 retracts, its telescopic end can pull the traction swing arm 65 to swing around the axis of the shaft rod 64, the top end of the traction swing arm 65 moves toward the side of the T-shaped frame 63, and the bottom end of the traction swing arm 65 moves away from the T-shaped frame 63, thereby driving the second mounting frame 52 and the two steering wheels 51 to move downward until the steering wheels 51 can contact the ground; as the second hydraulic cylinder 62 extends, it pushes the traction swing arm 65 to swing in the opposite direction, thereby driving the second mounting frame 52 and the steering wheels 51 to move back and reset so as to separate from the ground.

[0048] like Figure 3 and Figure 4 As shown, the lifting mechanism 4 includes a first hydraulic cylinder 42, a first mounting frame 41 is fixed between the two main beams 11, the first hydraulic cylinder 42 is fixed vertically downward on the first mounting frame 41, and the second wheel frame 31 is fixed to the telescopic end of the first hydraulic cylinder 42. The two second track wheels 3 are respectively arranged on both sides of the second wheel frame 31. When the first hydraulic cylinder 42 extends, the second wheel frame 31 and the second track wheels 3 on both sides are pushed downward. When the first hydraulic cylinder 42 retracts, the second wheel frame 31 and the second track wheels 3 on both sides are driven upward.

[0049] Among them, Figure 7As shown, the end of the first hydraulic cylinder 42 and the second hydraulic cylinder 62 through which the piston rod passes is defined as the telescopic side 02, wherein the oil inlet and outlet C621 on the cylinder body of one of the second hydraulic cylinders 62 close to the telescopic side 02 is connected to the oil inlet and outlet A421 on the cylinder body of the first hydraulic cylinder 42 away from the telescopic side 02 through the first conduit 03, the other oil inlet and outlet C621 on the cylinder body of the second hydraulic cylinder 62 is connected to the hydraulic station 8 through the third conduit 05, and the other oil inlet and outlet A421 on the cylinder body of the first hydraulic cylinder 42 is connected to the hydraulic station 8 through the second conduit 04.

[0050] It is worth noting that the two oil inlets and outlets C621 on the other second hydraulic cylinder 62 are respectively connected to the hydraulic station 8 through pipelines. The specific working principle is consistent with the existing technology and will not be described in detail in this application.

[0051] The specific principle of the mechanism in which the swing arm type adjustment mechanism 6 drives the steering wheel 51 downward and contacts the ground to link the two second track wheels 3 to move upward is as follows:

[0052] The oil in the hydraulic station 8 is supplied to the first hydraulic cylinder 42 through the second conduit 04, pushing the piston and piston rod in the first hydraulic cylinder 42 upward, realizing the retraction of the first hydraulic cylinder 42, so as to drive the second track wheel 3 upward. At the same time, the oil above the piston in the first hydraulic cylinder 42 flows into the second hydraulic cylinder 62 through the oil inlet and outlet A421 and the first conduit 03, pushing the piston and piston rod in the second hydraulic cylinder 62 to move toward the end away from the telescopic side 02, realizing the retraction of the second hydraulic cylinder 62, so as to drive the auxiliary steering mechanism 5 downward. At the same time, the oil on the other side of the piston in the second hydraulic cylinder 62 flows back to the hydraulic station 8 through the oil inlet and outlet C621 and the third conduit 05;

[0053] When the oil in the hydraulic station 8 is supplied to the second hydraulic cylinder 62 through the third conduit 05, the piston in the second hydraulic cylinder 62 is pushed to move toward the telescopic side 02, thereby realizing the extension of the second hydraulic cylinder 62, so as to drive the auxiliary steering mechanism 5 to reset upward. At the same time, the oil between the piston and the telescopic side 02 in the second hydraulic cylinder 62 flows into the first hydraulic cylinder 42 through the first conduit 03, pushing the piston in the first hydraulic cylinder 42 downward, thereby realizing the extension of the first hydraulic cylinder 42, so as to drive the second track wheel 3 to reset downward. At the same time, the oil below the piston in the first hydraulic cylinder 42 flows back to the hydraulic station 8 through the second conduit 04.

[0054] The above shows that the first hydraulic cylinder 42 and one of the second hydraulic cylinders 62 share the same oil circuit, so that the extension and retraction of the first hydraulic cylinder 42 and the second hydraulic cylinder 62 are synchronously linked. The oil circuit sharing simplifies the system structure, reduces the number of hydraulic components, and reduces the complexity of the oil circuit layout. The synchronous linkage mechanism ensures that the extension and retraction actions of the two are coordinated, avoiding posture deviation or power loss caused by asynchronous action. The precise matching of response speed and timing makes the up and down operations of driving the second track wheel 3 and the auxiliary steering mechanism 5 more efficient and coherent, thereby improving the movement coordination and operation stability of the overall system.

[0055] Example 3

[0056] See also Figure 1 The difference between this embodiment and embodiment 2 is that:

[0057] A placement plate 71 is arranged on the side of the base frame 1 away from the lifting boom 01, and a number of counterweights 7 are arranged above the placement plate 71. The counterweights 7 provide counterweights to balance the overturning moment generated when the lifting boom 01 lifts heavy objects, ensuring the stability of the center of gravity of the entire machine during operation and avoiding tilting or overturning of the fuselage due to excessive load on one side.

[0058] In addition, the counterweight 7 and the lifting boom 01 are arranged on opposite sides above the base frame 1, forming a symmetrical balance structure with the base frame 1 as the fulcrum. The lever principle is used to offset the gravity of the counterweight 7 and the torque of the boom load. This not only significantly improves the crane's anti-overturning ability during the lifting process, but also balances the pressure distribution of the fuselage on the floor, reduces the damage to the floor structure caused by local pressure concentration, and provides stable reverse support for the boom 01's amplitude change action, further ensuring operation safety and stability.

[0059] In addition, if Figure 12 As shown, both base frames 1 are fixed with slide rails 9 extending along the length direction thereof, and both slide rails 9 are slidably installed with slide seats 91, and the counterweight body 7 is fixed above the two slide seats 91. The two base frames 1 are installed with third hydraulic cylinders 92 on the sides away from each other through brackets, and the two third hydraulic cylinders 92 extend along the length direction of the main beam 11. The telescopic ends of the two third hydraulic cylinders 92 are fixedly connected to the slide seats 91 on the corresponding sides through connecting arms 93, wherein the third hydraulic cylinders 92 are connected to the hydraulic station 8 through pipelines, and the specific working principle is consistent with the prior art, and this application will not go into details.

[0060] Through the telescopic operation of the third hydraulic cylinder 92, the connecting action of the connecting arm 93 can drive the slide 91 to be translated along the slide rail 9, and then drive the placement plate 71 and the counterweight body 7 to be translated synchronously to adjust the distance between the counterweight body 7 and the lifting boom 01. Specifically, during the lifting operation, when the inclination angle of the lifting boom 01 increases (that is, the lifting height of the boom increases), the third hydraulic cylinder 92 retracts and drives the counterweight body 7 to move toward the lifting boom 01 through the connecting arm 93 to balance the torque. When the angle between the lifting boom 01 and the floor decreases, the third hydraulic cylinder 92 extends to drive the counterweight body 7 away from the lifting boom 01.

[0061] The adjustable counterweight position design can improve the anti-overturning ability by adjusting the distance between the counterweight body 7 and the lifting boom 01 in real time, dynamically balancing the torque according to the inclination angle of the lifting boom 01, and at the same time balancing the pressure distribution of the fuselage on the floor, reducing structural damage caused by local pressure concentration, and adapting to different working conditions when transferring or changing the lifting angle, ensuring the reasonable distribution of the center of gravity of the whole machine, improving steering accuracy and operational flexibility, and reducing dependence on support legs.

[0062] Example 4

[0063] See also Figure 8 and Figure 9 The difference between this embodiment and embodiment 3 is that:

[0064] The driving assembly includes a piston cylinder 53, a piston body 54 and a traction rod 55. The two ends of the second mounting frame 52 are respectively fixed with a rotating shaft 521. The two rotating shafts 521 are respectively rotatably mounted with a rotating seat 56. The rotating seat 56 has a disc seat 561 and a protruding arm 562.

[0065] The two steering wheels 51 are rotatably mounted on the corresponding side disc seats 561 respectively, the piston cylinder 53 is fixed on the second mounting frame 52, and the two oil inlets and outlets B531 thereon are respectively connected to the hydraulic station 8 through pipelines, the piston body 54 is adapted to be installed in the piston cylinder 53, the traction rod 55 is fixed to the piston body 54, and both ends extend to the outside of the piston cylinder 53, and the traction arms 57 are respectively hingedly mounted at both ends of the traction rod 55, and the other ends of the two traction arms 57 are respectively hinged to the convex arms 562 on the corresponding sides.

[0066] The oil in the hydraulic station 8 enters the piston cylinder 53 from the oil inlet and outlet B531 on one side, and the oil in the piston cylinder 53 on the other side of the piston body 54 flows back to the hydraulic station 8 through the oil inlet and outlet B531 on the other side, thereby pushing the piston body 54 and the traction rod 55 to move to one side as a whole. Under the articulated connection of the traction arm 57, the two ends of the traction rod 55 can pull the rotating seat 56 to rotate around the rotating shaft 521, thereby driving the two steering wheels 51 to deflect, so as to achieve auxiliary rotation of the steering wheel 51.

[0067] Example 5

[0068] See also Figure 4 、 Figure 10 and Figure 11 The difference between this embodiment and embodiment 4 is that:

[0069] On the first mounting frame 41, there are U-shaped sinking sections 411 on both sides of the first hydraulic cylinder 42, and the two U-shaped sinking sections 411 have sliding holes 412 respectively. Two vertically extending guide rods 43 are fixed on the second wheel frame 31, and the two guide rods 43 are slidably inserted into the sliding holes 412 in a one-to-one correspondence. When the first hydraulic cylinder 42 telescopes and drives the second wheel frame 31 and the second track wheel 3 to rise and fall, the second wheel frame 31 can drive the guide rods 43 to slide synchronously along the sliding holes 412. The sliding cooperation between the guide rods 43 and the sliding holes 412 provides a stable guiding support effect for the lifting and lowering of the second wheel frame 31 and the second track wheel 3.

[0070] In addition, the first mounting frame 41 is arranged lower than the placement plate 71. When the first hydraulic cylinder 42 retracts and drives the second wheel frame 31 to move up to the extreme position, the top surface of the two guide rods 43 is lower than the lower surface of the placement plate 71. The sliding hole 412 is arranged at the U-shaped sinking section 411, and the guide rod 43 is slidably installed at the U-shaped sinking section 411 to ensure that the guide rod 43 will not contact the bottom of the placement plate 71 when it moves up to the extreme position, thereby avoiding obstruction and interference of the placement plate 71 on the lifting and lowering of the guide rod 43.

[0071] By hydraulically linking the steering wheel 51 with the second track wheel 3, four-wheel stable steering is achieved, and the counterweight 7 can be adjusted along the slide rail 9 to dynamically balance the load torque.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A crawler-type floor crane, comprising a base frame (1) formed by welding a support plate (12) to two main beams (11), a lifting boom (01) and a hydraulic station (8) arranged on the main beams (11), characterized in that: Two first crawler wheels (2) are symmetrically mounted on one side below the base frame (1) via a first wheel frame (21), and two second crawler wheels (3) are symmetrically mounted on the other side via a lifting mechanism (4); An auxiliary steering mechanism (5) is installed below the base frame (1) near the second track wheel (3) through a swing arm type adjustment mechanism (6), and the swing arm type adjustment mechanism (6) is linked with the oil circuit of the lifting mechanism (4); When the swing arm type adjustment mechanism (6) drives the auxiliary steering mechanism (5) to swing downward until it contacts the ground, the lifting mechanism (4) is linked to drive the two second track wheels (3) to move upward and separate from the ground; The auxiliary steering mechanism (5) comprises a second mounting frame (52) provided on the swing end of the swing arm type adjustment mechanism (6), a drive assembly provided on the second mounting frame (52), and steering wheels (51) respectively arranged on both sides of the second mounting frame (52); The driving assembly is used to drive the two steering wheels (51) to deflect synchronously to assist in reversing; When the swing arm type adjustment mechanism (6) drives the auxiliary steering mechanism (5) to swing downward so that the steering wheel (51) contacts the ground, the linkage lifting mechanism (4) drives the two second crawler wheels (3) to move upward and be stored; The driving assembly comprises a piston cylinder (53), a piston body (54) and a traction rod (55); A rotating seat (56) is rotatably mounted on both sides of the second mounting frame (52) via a rotating shaft (521), and the two steering wheels (51) are rotatably mounted on a disc seat (561) provided on the rotating seat (56) on the corresponding side. The piston cylinder (53) is fixed on the second mounting frame (52), and the two oil inlets and outlets B (531) provided thereon are connected to the hydraulic station (8) through pipelines respectively; The piston body (54) is adapted to be installed in the piston cylinder (53), and the traction rod (55) is fixed to the piston body (54), and both ends extend to the outside of the piston cylinder (53); The two ends of the traction rod (55) are respectively hingedly mounted with traction arms (57), and the other ends of the two traction arms (57) are respectively hingedly connected to the protruding arms (562) on the rotating seat (56) on the corresponding side.

2. The crawler type floor crane according to claim 1, characterized in that: The swing-arm type adjustment mechanism (6) comprises a pair of second hydraulic cylinders (62), a shaft (64) and a pair of traction swing arms (65); A crossbeam (61) and a T-shaped frame (63) are fixed between the two main beams (11), and a shaft (64) is rotatably mounted on the T-shaped frame (63); The middle portions of the two traction swing arms (65) are fixedly sleeved on both sides of the shaft (64); The cylinder ends of the two second hydraulic cylinders (62) are hingedly mounted on the crossbeam (61), and the other ends are respectively hingedly connected to one end of the corresponding traction swing arm (65), and the other ends of the two traction swing arms (65) are correspondingly fixed with the second mounting frame (52).

3. The crawler type floor crane according to claim 2, characterized in that: The lifting mechanism (4) includes a first hydraulic cylinder (42); A first mounting frame (41) is fixed between the two main beams (11), and the first hydraulic cylinder (42) is fixed vertically downward on the first mounting frame (41); A second wheel frame (31) is fixed to the telescopic end of the first hydraulic cylinder (42), and the two second track wheels (3) are respectively arranged on both sides of the second wheel frame (31).

4. The crawler type floor crane according to claim 3, characterized in that: The ends of the first hydraulic cylinder (42) and the second hydraulic cylinder (62) through which the piston rods pass are defined as the telescopic side (02); An oil inlet and outlet C (621) on the cylinder body of one of the second hydraulic cylinders (62) close to the telescopic side (02) is connected to an oil inlet and outlet A (421) on the cylinder body of the first hydraulic cylinder (42) away from the telescopic side (02) through a first conduit (03); Another oil inlet and outlet C (621) on the cylinder body of the second hydraulic cylinder (62) is connected to the hydraulic station (8) via a third conduit (05), and another oil inlet and outlet A (421) on the cylinder body of the first hydraulic cylinder (42) is connected to the hydraulic station (8) via a second conduit (04).

5. The crawler type floor crane according to claim 3, characterized in that: A placement plate (71) is arranged on the side of the base frame (1) away from the lifting boom (01), and a plurality of counterweights (7) are arranged above the placement plate (71).

6. The crawler type floor crane according to claim 5, characterized in that: A slide rail (9) extending along the length direction of the two base frames (1) is fixed on each of the two base frames (1), and a slide seat (91) is slidably mounted on each of the two slide rails (9); The counterweight (7) is fixed above the two slide seats (91); A third hydraulic cylinder (92) is installed on each side of the two base frames (1) away from each other through a bracket, and both of the third hydraulic cylinders (92) extend along the length direction of the main beam (11); The telescopic ends of the two third hydraulic cylinders (92) are fixedly connected to the slide seats (91) on the corresponding sides via connecting arms (93).

7. The crawler type floor crane according to claim 5, characterized in that: The first mounting frame (41) is provided with U-shaped sinking sections (411) on both sides of the first hydraulic cylinder (42), and the two U-shaped sinking sections (411) are provided with sliding holes (412). Two vertically extending guide rods (43) are fixed on the second wheel frame (31), and the two guide rods (43) are slidably inserted into the sliding holes (412) in a one-to-one corresponding manner.

8. The crawler type floor crane according to claim 7, characterized in that: The first mounting frame (41) is arranged below the placement plate (71); When the first hydraulic cylinder (42) retracts to drive the second wheel frame (31) to move upward to the limit position, the top surfaces of the two guide rods (43) are lower than the lower surface of the placement plate (71).

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