Cantilever crane rotary table and concrete pump truck

Abstract

The utility model relates to the technical field of engineering vehicles, and particularly discloses an arm support rotary table and a concrete pump truck, the arm support rotary table comprises a rotary support frame, a rotary box body, a connecting plate and an arm support assembly, the rotary support frame comprises a frame body and four supporting legs, and the four supporting legs are arranged on the frame body at intervals in the circumferential direction of the frame body; the rotary box body is arranged on the frame body and is in running fit with the frame body; the connecting plate is arranged on the side face, away from the frame body, of the rotary box body and has a first state and a second state on the rotary box body, the first state is that the connecting plate slides on the side face, away from the frame body, of the rotary box body, and the second state is that the connecting plate and the rotary box body are relatively fixed; the arm frame assembly is fixedly arranged on the side, away from the rotary box body, of the connecting plate. When the connecting plate is in the first state, the connecting plate can slide on the side face, away from the frame body, of the rotary box body, then the center of the center of gravity of the whole truck can be adjusted, it is guaranteed that the center of gravity is located in the supporting face, and the concrete pump truck is prevented from tipping over.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering vehicles, in particular to an arm slewing platform and a concrete pump truck. Background Art

[0002] A concrete pump truck consists of a chassis and a boom slewing platform. The boom slewing platform comprises a slewing support frame and a boom assembly. The slewing support frame is fixed to the chassis, and the boom assembly is mounted above the fixed turret. The slewing mechanism drives the boom assembly to rotate relative to the slewing support frame, which in turn drives the boom to rotate relative to the chassis.

[0003] The operating range of a concrete pump truck depends on the extended length of the boom. Due to factors such as control sensitivity and boom strength, the overall length of the boom is limited. The operating range of the boom cannot be effectively expanded based on the current boom structure and cannot meet some special construction requirements.

[0004] In addition, when a concrete pump truck is operating, it is mainly supported on the ground by the outriggers located on the slewing support frame. The line connecting the support points of the outriggers forms the support surface of the concrete pump truck. The center of gravity of the truck body is located within this support surface to ensure that the truck body is stable and does not tip over. When the boom is long and the slewing speed is fast, the radius of the center of gravity trajectory circle of the pump truck is larger (the center of gravity is offset more compared to the center of gravity when the boom is not extended). In order to ensure that the support surface can meet the requirements of stable support, the outriggers of the pump truck often need to be extended a long distance to expand the support surface area and ensure that the offset center of gravity can still fall within the support surface. However, extending the outriggers of the pump truck a long distance will inevitably occupy a larger area. In the case of limited construction site, the outriggers of the pump truck cannot be extended according to the stability requirements, and the stability requirements of the truck body cannot be met.

[0005] Therefore, there is an urgent need for a boom turntable to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a boom turntable and a concrete pump truck to solve the problem in the related art that due to the long extension of the outriggers, the outriggers of the pump truck cannot be extended as required for stability when the construction site is limited, and the stability requirements of the vehicle body cannot be met.

[0007] In one aspect, the present invention provides a boom slewing platform, which includes:

[0008] The slewing support frame comprises a frame body and four legs, wherein the four legs are arranged on the frame body at intervals around the circumference of the frame body;

[0009] A rotary box body, the rotary box body is arranged on the frame body and rotates with the frame body;

[0010] a connecting plate, the connecting plate being arranged on a side of the rotary box away from the frame, and the connecting plate having a first state and a second state on the rotary box, the first state being that the connecting plate slides on the side of the rotary box away from the frame, and the second state being that the connecting plate and the rotary box are relatively fixed;

[0011] The arm assembly is fixedly arranged on a side of the connecting plate away from the rotary box body.

[0012] As an optimal technical solution for the arm turntable, the turntable includes a bottom plate, a connecting tube and a top plate. The two ends of the connecting tube are fixed to the bottom plate and the top plate respectively. The bottom plate rotates with the frame body, and the connecting plate is arranged on the top plate.

[0013] As an optimal technical solution for the arm turntable, the turntable body also includes a support plate and multiple vertical plates, the support plate is sleeved on the connecting tube and is located between the bottom plate and the top plate, the support plate is fixed to the connecting tube, the vertical plate is arranged between the support plate and the top plate and is respectively fixed to the support plate and the top plate, and multiple vertical plates are arranged at intervals.

[0014] As a preferred technical solution of the boom slewing platform, the plane where the top plate is located is provided with a first direction and a second direction perpendicular to each other, the top plate is provided with a first connecting holes spaced apart along the first direction, the connecting plate is provided with b second connecting holes spaced apart along the first direction, the second connecting holes are waist-shaped holes extending along the second direction, the b second connecting holes are selectively opposite to b of the a first connecting holes, and a>b;

[0015] It also includes b locking bolts and b locking nuts, wherein the b locking bolts pass through the b second connecting holes and the b first connecting holes in a one-to-one correspondence and are threadedly connected with the b locking nuts in a one-to-one correspondence.

[0016] As an optimal technical solution for the boom turntable, the first connecting holes are provided in at least two rows, and at least two rows of the first connecting holes are spaced apart along the second direction; the second connecting holes are provided in at least two rows, and at least two rows of the second connecting holes are spaced apart along the second direction.

[0017] As a preferred technical solution of the boom turntable, the surface of the top plate opposite to the connecting plate is provided with a first rough surface, and the surface of the connecting plate opposite to the top plate is provided with a second rough surface, and the first rough surface and the second rough surface are in contact with each other.

[0018] As an optimal technical solution for the boom turntable, the boom assembly includes a turntable and an arm, the turntable is fixed to the connecting plate, the arm and the turntable are pivotally connected through a pivot shaft, and the axis of the pivot shaft is parallel to the sliding plane of the connecting plate.

[0019] As an optimal technical solution for the arm slewing platform, it also includes a slewing support, which is arranged between the frame and the slewing box. The slewing support includes an outer ring, an inner ring and a driver. The inner ring is fixedly connected to the frame, the outer ring is fixedly connected to the slewing box, and the driver is transmission-connected to the outer ring.

[0020] As an optimal technical solution for the boom turntable, the outer peripheral surface of the outer ring is provided with external teeth, the output shaft of the driver is provided with a driving gear, and the driver is fixed to the frame and meshes with the external teeth of the outer ring.

[0021] On the other hand, the present invention provides a concrete pump truck, comprising a chassis and the boom turntable of any of the above solutions, wherein the frame is fixedly mounted on the chassis.

[0022] The beneficial effects of the utility model are:

[0023] The utility model provides a boom slewing platform and a concrete pump truck. The boom slewing platform includes a slewing support frame, a slewing box, a connecting plate, and a boom assembly. The slewing support frame includes a frame and four legs. The four legs are arranged on the frame at intervals around the circumference of the frame. The slewing box is arranged on the frame and rotates with the frame. The connecting plate is arranged on a side of the slewing box away from the frame, and the connecting plate has a first state and a second state on the slewing box. The first state is that the connecting plate slides on the side of the slewing box away from the frame, and the second state is that the connecting plate and the slewing box are relatively fixed. The boom assembly is fixed on the side of the connecting plate away from the slewing box. When the concrete pump truck is working, the four legs extend and are used to support the entire boom slewing platform. The line connecting the four legs forms a support surface. When the boom assembly is working, the center of gravity of the entire vehicle changes with the operation of the boom assembly, thereby forming a center of gravity circle of the entire vehicle. When the center of gravity circle of the entire vehicle is located within the support surface, it can be ensured that the concrete pump truck does not tip over. However, due to the limitations of the work site, the four legs cannot be fully extended, or in some special construction requirements, the size and shape of the support surface, as well as the radial size of the center of gravity circle will change, and the boundary of the center of gravity circle may exceed the support surface, causing the concrete pump truck to tip over. To avoid this problem, when the connecting plate of the present application is in the first state, the connecting plate can slide on the side of the rotating box away from the frame body, and then adjust the center of the center of gravity circle of the entire vehicle to ensure that the center of gravity circle is located within the support surface, and then switch the connecting plate to the second state. At this time, the operation of the arm assembly can ensure that the center of gravity of the entire vehicle is located within the support surface, thereby preventing the concrete pump truck from tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the arm slewing platform in an embodiment of the present utility model;

[0025] Figure 2 This is an exploded schematic diagram of the boom slewing platform in an embodiment of the present utility model;

[0026] Figure 3 This is a structural diagram of the rotary box in the embodiment of the present utility model;

[0027] Figure 4 This is a structural diagram of the connecting plate in an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the assembly of the rotary box and the connecting plate in an embodiment of the present utility model.

[0029] In the picture:

[0030] X, first direction; Y, second direction;

[0031] 1. Rotating support frame; 11. Frame; 12. Support legs;

[0032] 2. Rotating box; 21. Top plate; 211. First connecting hole; 22. Bottom plate; 23. Connecting tube; 24. Support plate; 25. Vertical plate;

[0033] 3. Connecting plate; 31. Second connecting hole;

[0034] 4. Boom assembly; 41. Turntable; 42. Boom; 43. Pivot shaft;

[0035] 5. Slewing bearing; 51. Outer ring; 52. Inner ring; 53. Driver. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0040] like Figures 1 to 5As shown, this embodiment provides an arm turntable, which includes a turntable support frame 1, a turntable box body 2, a connecting plate 3 and an arm assembly 4. The turntable support frame 1 includes a frame body 11 and four support legs 12. The four support legs 12 are arranged on the frame body 11 at circumferential intervals around the frame body 11. The turntable box body 2 is arranged on the frame body 11 and rotates with the frame body 11; the connecting plate 3 is arranged on a side of the turntable box body 2 away from the frame body 11, and the connecting plate 3 has a first state and a second state on the turntable box body 2. The first state is that the connecting plate 3 slides on a side of the turntable box body 2 away from the frame body 11, and the second state is that the connecting plate 3 is relatively fixed to the turntable box body 2; the arm assembly 4 is fixed on a side of the connecting plate 3 away from the turntable box body 2. When the concrete pump truck is in operation, the four legs 12 extend and support the entire boom slewing platform. The line connecting the four legs 12 forms a support surface. When the boom assembly 4 is in operation, the center of gravity of the entire vehicle changes with the operation of the boom assembly 4, thereby forming a center of gravity circle of the entire vehicle. When the center of gravity circle of the entire vehicle is located within the support surface, the concrete pump truck can be prevented from tipping over. However, due to the limitations of the work site, the four legs 12 cannot be fully extended, or under certain special construction requirements, the size and shape of the support surface, as well as the radial dimension of the center of gravity circle, may change, and the boundary of the center of gravity circle may exceed the support surface, causing the concrete pump truck to tip over. To avoid this problem, the connecting plate 3 of the present application can slide on the side of the slewing box 2 away from the frame 11 when in the first state, thereby adjusting the center of gravity circle of the entire vehicle to ensure that the center of gravity circle is located within the support surface. Then, the connecting plate 3 is switched to the second state. At this time, the operation of the boom assembly 4 can ensure that the center of gravity of the entire vehicle is located within the support surface, preventing the concrete pump truck from tipping over.

[0041] Optionally, the boom slewing platform further includes a slewing bearing 5, which is disposed between the frame 11 and the slewing housing 2. The slewing bearing comprises an outer ring 51, an inner ring 52, and a driver 53. The inner ring 52 is fixedly connected to the frame 11, the outer ring 51 is fixedly connected to the slewing housing 2, and the driver 53 is in driving connection with the outer ring 51. In this embodiment, the slewing bearing further includes rolling elements. The outer ring 51 is sleeved around the inner ring 52, and the rolling elements are disposed within an annular groove formed by the outer ring 51 and the inner ring 52, thereby enabling relative rotation between the outer ring 51 and the inner ring 52. Specifically, the inner ring 52 is provided with a plurality of first fixing holes axially disposed therein. A plurality of first fixing bolts pass through the plurality of first fixing holes and the frame 11 in a one-to-one correspondence, and are threadedly engaged with the plurality of first nuts in a one-to-one correspondence, thereby securing the inner ring 52 to the frame 11.

[0042] Optionally, the outer circumferential surface of the outer ring 51 is provided with external teeth, and the output shaft of the driver 53 is provided with a driving gear. The driver 53 is fixed to the frame 11 and meshes with the external teeth of the outer ring 51. In this embodiment, the driver 53 includes a driving member and a reducer. The output shaft of the driving member is fixedly connected to the input shaft of the reducer. The output shaft of the reducer is fixedly provided with a driving gear. The reducer has a deceleration and torque-increasing effect, thereby increasing the torque of the driving gear. The driver 53 can be an electric motor or a hydraulic motor.

[0043] Optionally, the rotary housing 2 includes a bottom plate 22, a connecting tube 23, and a top plate 21. The ends of the connecting tube 23 are fixedly connected to the bottom plate 22 and the top plate 21, respectively. The bottom plate 22 rotates with the frame 11, and the connecting plate 3 is disposed on the top plate 21. In this embodiment, the bottom plate 22 is annular and faces the outer ring 51 of the rotary support. The bottom plate 22 is provided with a plurality of second fixing holes axially therearound. A plurality of second fixing bolts pass through the plurality of second fixing holes and the outer ring 51 in a one-to-one correspondence and are threadedly engaged with a plurality of second nuts in a one-to-one correspondence, thereby achieving a fixed connection between the outer ring 51 and the bottom plate 22. The connecting tube 23 not only connects the bottom plate 22 and the top plate 21, but also spaces the top plate 21 and the bottom plate 22 apart, thereby preventing the top plate 21 from interfering with the frame 11 in movement.

[0044] Optionally, the rotary box body 2 further includes a support plate 24 and a plurality of vertical plates 25. The support plate 24 is sleeved on the connecting tube 23 and is located between the bottom plate 22 and the top plate 21. The support plate 24 is fixedly connected to the connecting tube 23. The vertical plates 25 are arranged between the support plate 24 and the top plate 21 and are respectively fixedly connected to the support plate 24 and the top plate 21. The plurality of vertical plates 25 are arranged at intervals. In this embodiment, since the top plate 21 is subjected to the force from the arm assembly 4, in order to prevent the top plate 21 from deforming, the support plate 24 and the plurality of vertical plates 25 are provided. This arrangement, on the one hand, improves the overall anti-deformation capability of the top plate 21. On the other hand, compared with increasing the thickness of the top plate 21, this arrangement has the advantages of low cost and light weight while ensuring the overall strength of the rotary box body 2.

[0045] Regarding the specific structure in which the connecting plate 3 has a first state and a second state on the top plate 21, optionally, the plane where the top plate 21 is located is provided with a first direction X and a second direction Y perpendicular to each other, the top plate 21 is provided with a first connecting holes 211 at intervals along the first direction X, the connecting plate 3 is provided with b second connecting holes 31 at intervals along the first direction X, the second connecting holes 31 are waist-shaped holes extending along the second direction Y, the b second connecting holes 31 are selectively opposite to the b first connecting holes 211 among the a first connecting holes 211, a>b; the boom turntable also includes b locking bolts and b locking nuts, the b locking bolts pass through the b second connecting holes 31 and the b first connecting holes 211 in a one-to-one correspondence and are threadedly connected with the b locking nuts in a one-to-one correspondence. When the cam 21 is in the locked position, the locking nut 31 is tightened to lock the connecting plate 3 and the top plate 21 so that the cam 21 is in the locked position.

[0046] Optionally, the first connection holes 211 are provided in at least two rows, spaced apart along the second direction Y, and the second connection holes 31 are provided in at least two rows, spaced apart along the second direction Y. In this embodiment, this arrangement can further enhance the relative fixation between the connection plate 3 and the top plate 21 when in the second state. Specifically, the first connection holes 211 are provided in two rows, and the second connection holes 31 are provided in two rows.

[0047] Optionally, the surface of the top plate 21 facing the connecting plate 3 is provided with a first rough surface, and the surface of the connecting plate 3 facing the top plate 21 is provided with a second rough surface, so that the first rough surface and the second rough surface abut against each other. In this embodiment, the above arrangement can further increase the friction between the connecting plate 3 and the top plate 21, thereby improving the relative fixation effect of the connecting plate 3 and the top plate 21.

[0048] Optionally, the arm assembly 4 includes a turntable 41 and an arm 42. The turntable 41 is fixed to the connecting plate 3. The arm 42 is pivotally connected to the turntable 41 via a pivot shaft 43. The axis of the pivot shaft 43 is parallel to the sliding plane of the connecting plate 3. In this embodiment, the turntable 41 includes a turntable and two support plates 24. The turntable is screwed to the connecting plate 3 via bolts and nuts. The two support plates 24 are fixed to the turntable at intervals. The pivot end of the arm 42 is inserted between the two support plates 24. The pivot shaft 43 passes through the pivot ends of the two support plates 24 and the arm 42.

[0049] This embodiment further provides a concrete pump truck, comprising a chassis and the boom slewing platform in the above solution, wherein the frame 11 is fixedly mounted on the chassis.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The arm slewing platform is characterized by: include: A rotary support frame (1) comprises a frame body (11) and four supporting legs (12), wherein the four supporting legs (12) are arranged on the frame body (11) at intervals around the circumference of the frame body (11); A rotary box (2), the rotary box (2) being arranged on the frame (11) and rotatingly cooperating with the frame (11); A connecting plate (3), the connecting plate (3) being arranged on a side of the rotary box (2) away from the frame (11), and the connecting plate (3) having a first state and a second state on the rotary box (2), the first state being that the connecting plate (3) slides on a side of the rotary box (2) away from the frame (11), and the second state being that the connecting plate (3) and the rotary box (2) are relatively fixed; The arm assembly (4) is fixedly arranged on a side of the connecting plate (3) away from the rotary box (2).

2. The boom slewing platform according to claim 1, characterized in that: The rotary box body (2) includes a bottom plate (22), a connecting tube (23) and a top plate (21); the two ends of the connecting tube (23) are respectively fixed to the bottom plate (22) and the top plate (21); the bottom plate (22) is rotatably matched with the frame body (11); and the connecting plate (3) is arranged on the top plate (21).

3. The boom slewing platform according to claim 2, characterized in that: The rotary box body (2) further comprises a support plate (24) and a plurality of vertical plates (25), wherein the support plate (24) is sleeved on the connecting tube (23) and located between the bottom plate (22) and the top plate (21), the support plate (24) is fixedly connected to the connecting tube (23), the vertical plates (25) are arranged between the support plate (24) and the top plate (21) and are respectively fixedly connected to the support plate (24) and the top plate (21), and the plurality of vertical plates (25) are arranged at intervals.

4. The boom slewing platform according to claim 2, characterized in that: The plane where the top plate (21) is located is provided with a first direction (X) and a second direction (Y) perpendicular to each other, the top plate (21) is provided with a first connection holes (211) at intervals along the first direction (X), the connection plate (3) is provided with b second connection holes (31) at intervals along the first direction (X), the second connection holes (31) are waist-shaped holes extending along the second direction (Y), the b second connection holes (31) are selectively opposite to the b first connection holes (211) among the a first connection holes (211), a>b; It also includes b locking bolts and b locking nuts, wherein the b locking bolts pass through the b second connection holes (31) and the b first connection holes (211) in a one-to-one correspondence and are threadedly connected with the b locking nuts in a one-to-one correspondence.

5. The boom slewing platform according to claim 4, characterized in that: The first connection holes (211) are provided in at least two rows, and the at least two rows of the first connection holes (211) are spaced apart along the second direction (Y); the second connection holes (31) are provided in at least two rows, and the at least two rows of the second connection holes (31) are spaced apart along the second direction (Y).

6. The boom slewing platform according to claim 4, characterized in that: The surface of the top plate (21) facing the connecting plate (3) is provided with a first rough surface, and the surface of the connecting plate (3) facing the top plate (21) is provided with a second rough surface, and the first rough surface and the second rough surface are in contact with each other.

7. The boom slewing platform according to any one of claims 1 to 6, characterized in that: The arm assembly (4) comprises a turntable (41) and an arm (42), wherein the turntable (41) is fixed to the connecting plate (3), and the arm (42) is pivotally connected to the turntable (41) via a pivot shaft (43), wherein the axis of the pivot shaft (43) is parallel to the sliding plane of the connecting plate (3).

8. The boom slewing platform according to any one of claims 1 to 6, characterized in that: The invention also includes a slewing support (5), which is arranged between the frame (11) and the slewing box (2), and includes an outer ring (51), an inner ring (52) and a driver (53), wherein the inner ring (52) is fixedly connected to the frame (11), the outer ring (51) is fixedly connected to the slewing box (2), and the driver (53) is transmission-connected to the outer ring (51).

9. The boom slewing platform according to claim 8, characterized in that: The outer peripheral surface of the outer ring (51) is provided with external teeth, the output shaft of the driver (53) is provided with a driving gear, and the driver (53) is fixed to the frame (11) and meshes with the external teeth of the outer ring (51).

10. Concrete pump truck, characterized in that: It comprises a chassis and the boom turntable according to any one of claims 1 to 9, wherein the frame body (11) is fixed to the chassis.

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