Crawler-type floor crane

Abstract

The invention relates to the technical field of engineering machinery, in particular to a crawler-type floor crane which comprises a base frame formed by welding a supporting plate body on two main beams, and a crane jib and a hydraulic station which are arranged on the main beams, two first crawler wheels are symmetrically mounted on one side of the lower portion of the base frame through a first wheel carrier, and two second crawler wheels are symmetrically mounted on the other side of the lower portion of the base frame through a second wheel carrier; one side of the base frame is symmetrically provided with two first crawler wheels through a lifting mechanism, the other side of the base frame is symmetrically provided with two second crawler wheels through a lifting mechanism, an auxiliary steering mechanism is arranged below the base frame and close to the second crawler wheels through a swing arm type adjusting mechanism, and the swing arm type adjusting mechanism is in linkage fit with the lifting mechanism; the linkage lifting mechanism drives the two second crawler wheels to move upwards to be separated from the ground. The auxiliary steering mechanism comprises a second mounting frame, a driving assembly and a steering wheel. Through hydraulic linkage switching of the steering wheel and the second crawler wheel, four-wheel stable steering is achieved, the position of the balance weight body can be adjusted along the sliding rail, and the hoisting moment is dynamically balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly to a crawler-type floor crane. Background Art

[0002] A crawler-type floor crane is a floor lifting device with a crawler chassis as the traveling device, specially designed for high-rise building floors or top-floor operations. Combining the tower body and the boom structure, it realizes the vertical lifting and horizontal movement of heavy objects with the help of a hydraulic or electric power system, can conveniently transfer between different operation points within the floor, and has the characteristics of small occupied space, strong terrain adaptability, simple installation and disassembly, etc. It is especially suitable for building material transportation, equipment hoisting and material lifting tasks in narrow spaces during the later construction of high-rise buildings.

[0003] The existing crawler-type floor crane only has two crawler traveling wheels. The contact area between the double crawler traveling wheels and the ground is small, and the overall stability of the machine is insufficient. When lifting heavy objects, it relies on outriggers to assist in stabilizing, resulting in a more cumbersome operation process and higher requirements for the floor flatness.

[0004] In addition, the steering mechanism of the two crawler traveling wheels realizes steering by controlling the speed difference between the two crawlers, that is, the driving device is used to adjust the running speeds of the left and right crawlers. When the two crawlers move forward at different speeds, a steering torque is generated to make the equipment turn. This steering mechanism is prone to obvious shaking during the turning process due to torque imbalance under heavy load conditions, with poor steering accuracy and operation smoothness. At the same time, the concentrated ground pressure is likely to aggravate the burden on the floor structure, and thus is likely to damage the floor structure. Summary of the Invention

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

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

[0007] A crawler type floor crane comprises a base frame formed by welding a supporting plate body on two main beams, a lifting arm and a hydraulic station arranged on the main beams, two first crawler wheels are symmetrically installed on one side below 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 wheel through a swing arm type adjustment mechanism, the swing arm type adjustment mechanism is linked with the oil circuit of the lifting mechanism, wherein, when the swing arm type adjustment mechanism drives the auxiliary steering mechanism to swing downward to contact with the ground, the linkage lifting mechanism drives the two second crawler wheels to move up and separate from the ground, the auxiliary steering mechanism comprises a second mounting frame arranged on the swing end of the swing arm type adjustment mechanism, a driving assembly arranged on the second mounting frame and steering wheels respectively arranged on both sides of the second mounting frame, wherein the driving assembly is used to drive the two steering wheels to deflect synchronously to assist in reversing; when the swing arm type adjustment mechanism drives the auxiliary steering mechanism to swing downward to make the steering wheel contact with the ground, the linkage lifting mechanism drives the two second crawler wheels 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 steering, reduce steering shake under heavy load conditions, reduce damage to the floor structure caused by concentrated ground pressure, and improve steering accuracy and operating 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 cross beam 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 fixedly mounted on both sides of the axle rod, the cylinder ends of the two second hydraulic cylinders are hingedly mounted on the cross beam, and the other ends are respectively hinged to one end of the corresponding traction swing arm, and 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 an oil inlet and outlet C on the cylinder body of one of the second hydraulic cylinders close to the telescopic side is connected to an oil inlet and outlet A on the cylinder body of the first hydraulic cylinder away from the telescopic side through a first conduit, another 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 another 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 driving assembly includes a piston cylinder, a piston body and a traction rod. A rotating seat is rotatably mounted on both sides of the second mounting frame through a rotating shaft. The two steering wheels are rotatably mounted on the disc seats provided on the rotating seats on the corresponding sides. The piston cylinder is fixed on the second mounting frame. Two oil inlets and outlets B provided 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. Traction arms are hingedly mounted on both ends of the traction rod. The other ends of the two traction arms are hinged to the convex arms provided on the rotating seats on the corresponding sides.

[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, the counterweight body is fixed above the two slide seats, and third hydraulic cylinders are respectively installed through brackets on the sides of the two base frames away from each other, and the two 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 the second wheel frame is fixed with two vertically extending guide rods, which are slidably inserted into the sliding holes in a one-to-one manner.

[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 up 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 beneficial effects of the present invention are as follows.

[0018] The symmetrical arrangement of the first track wheel and the second track wheel forms a four-point crawler walking structure. Compared with the traditional double-track structure, it can increase the contact area between the whole machine and the ground, effectively enhance the support stability during operation, reduce the dependence on the supporting legs when lifting heavy objects, reduce the stringent requirements on the flatness of the floor, 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 steering, reduce steering shake under heavy load conditions, reduce damage to the floor structure caused by concentrated ground pressure, and improve steering accuracy and operating smoothness.

[0020] The second hydraulic cylinder and the first hydraulic cylinder are connected through oil circuits such as the first conduit to form a hydraulic linkage mechanism. The oil inlets and outlets of the two cylinder bodies form a closed-loop oil circuit system with the hydraulic station through the first conduit, the second conduit, and the third conduit, realizing the synchronous linkage of their telescopic actions. This design can reduce the number of hydraulic components, lower the complexity of the oil circuit layout, avoid attitude deviation and power loss caused by asynchronous actions, make the system respond faster, and ensure the high-efficiency continuity of driving the second crawler wheel and the auxiliary steering mechanism to move up and down.

[0021] The counterweight can be adjusted in real time according to the inclination angle of the lifting boom through an adjustable mechanism composed of a slide rail, a slide seat, a third hydraulic cylinder, etc. When the inclination angle of the lifting boom increases, the third hydraulic cylinder retracts to drive the counterweight closer to the lifting boom, using the lever principle to cancel out the counterweight moment and the load moment of the boom, improving the anti-overturning ability, balancing the pressure distribution of the fuselage on the floor surface, reducing structural damage caused by local pressure concentration, and adapting to different lifting working conditions and transfer requirements. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the partial structure of the main body of this crawler-mounted floor crane;

[0023] Figure 2 is Figure 1 the partial structure schematic diagram shown;

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

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

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

[0027] Figure 6 is Figure 5 the partial structure schematic diagram shown;

[0028] Figure 7 It is a schematic diagram of the oil circuit connection of the first hydraulic cylinder and the second hydraulic cylinder in the present invention;

[0029] Figure 8 It is a schematic diagram of the detailed structure of the auxiliary steering mechanism in the present invention;

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

[0031] Figure 10 It is a schematic diagram of the detailed structure of the lifting mechanism in the present invention;

[0032] Figure 11 is Figure 10Schematic enlarged view of the structure at position A in [the text];

[0033] Figure 12 Schematic diagram of the counterweight structure in the present invention.

[0034] In the figure: 01, lifting boom; 02, telescopic side; 03, first conduit; 04, second conduit; 05, third conduit; 1, base frame; 11, main beam; 12, support plate body; 2, first crawler wheel; 21, first wheel frame; 3, second crawler 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, convex arm; 57, traction arm; 6, swing arm type adjustment mechanism; 61, cross beam; 62, second hydraulic cylinder; 621, oil inlet and outlet C; 63, T-shaped frame; 64, shaft rod; 65, traction swing arm; 7, counterweight; 71, placement plate; 8, hydraulic station; 9, slide rail; 91, slide block; 92, third hydraulic cylinder; 93, connecting arm. Detailed implementation manners

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

[0036] Embodiment 1

[0037] Please refer to Figures 1 - 12 , the present invention provides a crawler type floor crane, including a lifting boom 01, a base frame 1 and a hydraulic station 8. Among them, the base frame 1 includes a main beam 11 and a support plate body 12. The two main beams 11 are arranged in parallel, and are fixed by welding a plurality of cross beams (not shown in the figure) therebetween. The support plate body 12 is fixed on the tops of the two main beams 11. The lifting boom 01 is hinged on one side of the support plate body 12, and the hydraulic station 8 is arranged on the other side of the support plate body 12. The hydraulic station 8 serves as a hydraulic distribution system, providing power and control for each hydraulic drive component in the present application. The hydraulic station 8 adopts the prior art, so the specific structure and principle will not be described in detail.

[0038] A traction device for pulling the lifting boom 01 to swing to control the lifting inclination angle is further provided on the support plate body 12. At the same time, a winch is also provided on the support plate body 12. The cable on the winch bypasses the pulley device arranged at the top of the lifting boom 01 and the pulley arranged on the hook to control the lifting and lowering of the hook. The traction device, winch, cable, pulley device, hook and pulley all adopt the prior art, forming a lifting system, and the specific lifting principle will not be described in detail.

[0039] AsFigure 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 one 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 one 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. Both the first track wheel 2 and the second track wheel 3 adopt the existing crawler walking structure. The specific structure and walking principle will not be described in detail, and it can adapt to the complex floor construction environment.

[0040] The crane body is formed by two main beams 11 and a supporting plate 12. Compared with a conventional crane, the crane 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 conventional 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, and 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 arranged on the swing end of the swing arm type adjustment mechanism 6, a driving component arranged on the second mounting frame 52, and steering wheels 51 respectively arranged on both sides of the second mounting frame 52, wherein the driving component is used to drive the two steering wheels 51 to deflect synchronously to assist in switching, and while 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, when the swing arm type adjusting mechanism 6 drives the steering wheel 51 to move downward and contact the ground, the mechanism that links the upward movement of the two second crawler wheels 3 enables the steering wheel 51 to replace the second crawler wheel 3 and the first crawler wheel 2 to form a stable four-wheel structure, effectively ensuring the horizontal level of the vehicle body, avoiding the vehicle body from tilting sideways and affecting the stability during steering. On the other hand, it can avoid the contact friction between the second crawler wheel 3 and the ground, further reducing the damage to the floor structure.

[0044] Embodiment 2

[0045] Please refer to Figures 3 - 8 , the difference between this embodiment and Embodiment 1 is that:

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

[0047] Through the retraction operation of the second hydraulic cylinder 62, 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 towards the side of the T-shaped frame 63, and the bottom end of the traction swing arm 65 moves towards the side 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; through the extension operation of the second hydraulic cylinder 62, it pushes the traction swing arm 65 to swing in the reverse direction, thereby driving the second mounting frame 52 and the steering wheels 51 to move back and reset to separate from the ground.

[0048] As Figure 3 and Figure 4 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 vertically fixed on the first mounting frame 41. The telescopic end of the first hydraulic cylinder 42 is fixed with a second wheel frame 31. The two second crawler wheels 3 are respectively arranged on both sides of the second wheel frame 31. By the extension operation of the first hydraulic cylinder 42, it can push the second wheel frame 31 and the second crawler wheels 3 on both sides to move downward. By the retraction operation of the first hydraulic cylinder 42, it can drive the second wheel frame 31 and the second crawler wheels 3 on both sides to move upward.

[0049] Among them, as 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 an oil inlet and outlet C621 on the cylinder body of the second hydraulic cylinder 62 close to the telescopic side 02 is connected to an oil inlet and outlet A421 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 C621 on the cylinder body of the second hydraulic cylinder 62 is connected to the hydraulic station 8 through a third conduit 05, and another oil inlet and outlet A421 on the cylinder body of the first hydraulic cylinder 42 is connected to the hydraulic station 8 through a 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 prior art and will not be described in detail in this application.

[0051] The specific principle of the mechanism by which the swing arm type adjustment mechanism 6 drives the steering wheel 51 downward to contact the ground and links 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, enabling the telescopic movements of the first hydraulic cylinder 42 and the second hydraulic cylinder 62 to be synchronized and linked. The shared oil circuit simplifies the system structure, reduces the number of hydraulic components, and lowers the complexity of the oil circuit layout. The synchronous linkage mechanism ensures that the telescopic movements of both are coordinated, avoiding attitude deviations or power losses caused by asynchronous movements. The accurate matching of the response speed and timing makes the up and down operations of the drive second crawler wheel 3 and the auxiliary steering mechanism 5 more efficient and coherent, enhancing the movement coordination and operation stability of the overall system.

[0055] Embodiment 3

[0056] Please refer to Figure 1 , the difference between this embodiment and Embodiment 2 is that:

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

[0058] In addition, the counterweights 7 and the lifting boom 01 are arranged on opposite sides above the base frame 1, which can form a symmetric balance structure with the base frame 1 as the fulcrum. Using the lever principle, the gravity of the counterweights 7 cancels out the moment of the load on the boom, which can not only significantly improve the anti-tipping ability of the crane during the lifting process, but also balance the pressure distribution of the fuselage on the floor surface, reduce the damage to the floor structure caused by local pressure concentration, and at the same time provide a stable reverse support for the luffing action of the lifting boom 01, further ensuring the operation safety and stability.

[0059] In addition, as Figure 12 shown, slide rails 9 extending along the length direction of the base frames 1 are fixed on both base frames 1. Slide seats 91 are slidably installed on both slide rails 9. The counterweights 7 are fixed above the two slide seats 91. On the mutually remote sides of the two base frames 1, third hydraulic cylinders 92 are respectively installed through brackets. Both 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 corresponding slide seats 91 through connecting arms 93. Among them, the third hydraulic cylinders 92 are connected to the hydraulic station 8 through pipelines. The specific working principle is the same as that of the prior art, and will not be elaborated in detail in this application.

[0060] Through the telescopic operation of the third hydraulic cylinder 92, under the connection action of the connecting arm 93, the sliding seat 91 can be driven to translate and adjust along the slide rail 9, and then drive the placement plate 71 and the counterweight 7 to translate and adjust synchronously, so as to realize the adjustment of the distance between the counterweight 7 and the lifting boom 01. Specifically, during the lifting operation, when the inclination angle of the lifting boom 01 increases (i.e., the lifting height of the boom increases), the third hydraulic cylinder 92 retracts, and the counterweight 7 is driven by the connecting arm 93 to move towards the lifting boom 01 to balance the moment. When the angle between the lifting boom 01 and the floor decreases, the third hydraulic cylinder 92 extends to drive the counterweight 7 away from the lifting boom 01.

[0061] The design of adjustable counterweight position can dynamically balance the moment according to the inclination angle of the lifting boom 01 by adjusting the distance between the counterweight 7 and the lifting boom 01 in real time, so as to improve the anti-overturning ability. At the same time, it can balance the pressure distribution of the fuselage on the floor, reduce the structural damage caused by local pressure concentration, and can also adapt to different working conditions when transferring or changing the lifting angle, ensure the reasonable distribution of the whole machine's center of gravity, improve the steering accuracy and operation flexibility, and reduce the dependence on the support legs.

[0062] Embodiment 4

[0063] Please refer to Figure 8 and Figure 9 This embodiment is different from Embodiment 3 in that:

[0064] The drive assembly includes a piston cylinder 53, a piston body 54 and a traction rod 55. The two ends of the second mounting bracket 52 are respectively fixed with a rotating shaft 521, and two rotating seats 56 are respectively rotatably sleeved on the two rotating shafts 521. The rotating seat 56 has a disc seat 561 and a convex arm 562;

[0065] The two steering wheels 51 are respectively rotatably installed on the corresponding side disc seats 561. The piston cylinder 53 is fixed on the second mounting bracket 52, and the two oil inlets and outlets B531 on it are respectively connected to the hydraulic station 8 through pipelines. The piston body 54 is adaptively installed in the piston cylinder 53. The traction rod 55 is fixedly penetrated in the piston body 54 and extends through both ends to the outside of the piston cylinder 53. The two ends of the traction rod 55 are respectively hinged with a traction arm 57, and the other ends of the two traction arms 57 are respectively hinged with the convex arms 562 on the corresponding side.

[0066] When the oil in the hydraulic station 8 enters the piston cylinder 53 from one oil inlet and outlet B531, and the oil on the other side of the piston body 54 in the piston cylinder 53 flows back to the hydraulic station 8 through the other oil inlet and outlet B531, the piston body 54 and the traction rod 55 as a whole can be pushed to move to one side. Under the articulated connection action of the traction arms 57 at both ends of the traction rod 55, the rotating seat 56 can be pulled to rotate around the rotating shaft 521, and then drive the two steering wheels 51 to deflect, so as to realize the rotation assistance of the steering wheels 51.

[0067] Example 5

[0068] Please refer to Figure 4 、 Figure 10 and Figure 11 The difference between this embodiment and Embodiment 4 is that:

[0069] On the first mounting bracket 41, on both sides of the first hydraulic cylinder 42 are respectively U-shaped sinking sections 411. There are sliding holes 412 at the two U-shaped sinking sections 411. Two vertically extending guide rods 43 are fixed on the second wheel frame 31. 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 expands and contracts to drive the second wheel frame 31 and the second crawler wheel 3 to move up and down, the second wheel frame 31 can drive the guide rods 43 to slide synchronously along the sliding holes 412. By using the sliding fit between the guide rods 43 and the sliding holes 412, a stable guiding and supporting effect is provided for the up and down movement of the second wheel frame 31 and the second crawler wheel 3.

[0070] In addition, the first mounting bracket 41 is arranged lower than the placement plate 71. When the first hydraulic cylinder 42 retracts to drive the second wheel frame 31 to move up to the limit position, the top surfaces of the two guide rods 43 are lower than the lower surface of the placement plate 71. The sliding holes 412 are arranged at the U-shaped sinking sections 411, and the guide rods 43 are slidably installed at the U-shaped sinking sections 411, ensuring that when the guide rods 43 move up to the limit position, they will not contact the lower part of the placement plate 71, avoiding the placement plate 71 from blocking and interfering with the up and down movement of the guide rods 43.

[0071] Through the hydraulic linkage switching between the steering wheel 51 and the second crawler wheel 3, stable four-wheel steering is achieved. The counterweight 7 can adjust its position along the slide rail 9 to dynamically balance the lifting moment.

[0072] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

Claims

1. A crawler-type floor crane, comprising a base frame (1) formed by welding a support plate body (12) on two main beams (11), a lifting boom (01) and a hydraulic station (8) arranged on the main beams (11), characterized in that: On one side below the base frame (1), two first crawler wheels (2) are symmetrically installed through a first wheel frame (21), and on the other side, two second crawler wheels (3) are symmetrically installed through a lifting mechanism (4); An auxiliary steering mechanism (5) is installed below the base frame (1) near the second crawler wheel (3) through a swing arm type adjustment mechanism (6), and the swing arm type adjustment mechanism (6) is in oil circuit linkage cooperation with the lifting mechanism (4); Wherein, when the swing arm type adjustment mechanism (6) drives the auxiliary steering mechanism (5) to swing downward to contact the ground, the lifting mechanism (4) is linked to drive the two second crawler wheels (3) to move upward and separate from the ground; The auxiliary steering mechanism (5) includes a second mounting frame (52) provided at the swing end of the swing arm type adjustment mechanism (6), a driving component provided on the second mounting frame (52), and steering wheels (51) arranged on both sides of the second mounting frame (52) respectively; Wherein, the driving component 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 to make the steering wheels (51) contact the ground, the lifting mechanism (4) is linked to drive the two second crawler wheels (3) to move upward and be stored.

2. A crawler-type floor crane according to claim 1, characterized in that: The swing arm type adjustment mechanism (6) includes a pair of second hydraulic cylinders (62), a shaft rod (64) and a pair of traction swing arms (65); A cross beam (61) and a T-shaped frame (63) are fixed between the two main beams (11), and the shaft rod (64) is rotatably installed on the T-shaped frame (63); The middle parts of the two traction swing arms (65) are respectively fixedly sleeved on both sides of the shaft rod (64); The cylinder ends of the two second hydraulic cylinders (62) are hinged and installed on the cross beam (61), and the other ends are respectively hinged 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. A 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 vertically fixed on the first mounting frame (41); The telescopic end of the first hydraulic cylinder (42) is fixed with a second wheel frame (31), and the two second crawler wheels (3) are respectively arranged on both sides of the second wheel frame (31).

4. A crawler-type floor crane according to claim 3, characterized in that: Define the end of the first hydraulic cylinder (42) and the second hydraulic cylinder (62) through which the piston rod passes as the telescopic side (02); The oil inlet / outlet C (621) on the cylinder body of one of the second hydraulic cylinders (62) near the telescopic side (02) is communicated with the oil inlet / outlet A (421) on the cylinder body of the first hydraulic cylinder (42) far from the telescopic side (02) through a first conduit (03). The other oil inlet / outlet C (621) on the cylinder body of the second hydraulic cylinder (62) is connected to the hydraulic station (8) through a third conduit (05), and the other oil inlet / outlet A (421) on the cylinder body of the first hydraulic cylinder (42) is connected to the hydraulic station (8) through a second conduit (04).

5. A crawler-type floor crane according to claim 1, characterized in that: The drive assembly includes a piston cylinder (53), a piston body (54) and a traction rod (55). On both sides of the second mounting frame (52), a rotating seat (56) is rotatably mounted through a rotating shaft (521), and the two steering wheels (51) are respectively rotatably mounted on the disc seats (561) on the corresponding rotating seats (56). The piston cylinder (53) is fixed on the second mounting frame (52), and the two oil inlet / outlets B (531) thereon are respectively connected to the hydraulic station (8) through pipelines. The piston body (54) is fitted and installed in the piston cylinder (53), the traction rod (55) is fixedly penetrated in the piston body (54), and both ends thereof penetrate and extend outside the piston cylinder (53). Both ends of the traction rod (55) are respectively hinged with a traction arm (57), and the other ends of the two traction arms (57) are respectively hinged with the convex arms (562) on the corresponding rotating seats (56).

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

7. A crawler-type floor crane according to claim 6, characterized in that: Sliding rails (9) extending along the length direction thereof are fixed on both of the base frames (1), and sliding seats (91) are slidably mounted on both of the sliding rails (9). The counterweights (7) are fixed above the two sliding seats (91). On the mutually remote sides of the two base frames (1), third hydraulic cylinders (92) are respectively mounted through brackets, 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 corresponding sliding seats (91) through a connecting arm (93).

8. A crawler-type floor crane according to claim 6, characterized in that: On both sides of the first hydraulic cylinder (42) on the first mounting frame (41) are U-shaped sinking sections (411), and sliding holes (412) are respectively formed at the two U-shaped sinking sections (411). Two vertically extending guide rods (43) are fixed on the second wheel frame (31), and the two guide rods (43) are respectively slidably inserted into the sliding holes (412) in a one-to-one correspondence.

9. A crawler-type floor crane according to claim 8, characterized in that: The first mounting frame (41) is arranged lower than the placing 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 placing plate (71).

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