A truss boom section and crane

Abstract

The present disclosure relates to a truss boom section, comprising: a pair of chords; a plurality of first webs, at least one end of which is connected to the chords; and a plurality of second webs, at least one end of which is connected to the first webs; wherein at least one of the angle of the first web relative to the chord, the angle of the second web relative to the first web, the length of the first web and the length of the second web is adjustable, so that the distance between the pair of chords is adjustable. According to an embodiment of the present disclosure, the truss boom section can at least increase the variable range of the cross-sectional area of ​​the truss boom section, thereby improving the bearing capacity of the truss boom in the working state and making it more convenient to transport in the transport state; it can also strengthen the connection strength of the components in the truss boom section, so that the structure of the truss boom has a stronger bearing capacity while adapting to the deformable function.

Description

Technical Field

[0001] The present disclosure relates to the field of engineering machinery, and in particular to a truss boom section and a crane. Background Art

[0002] The truss arm (jib) composed of multiple truss arm sections is a key load-bearing structural component in the crane lifting process. In particular, the lifting performance of a large arm with a small amplitude is directly affected by the performance of the wall frame. In order to improve the lifting performance, the relevant truss arm often chooses to increase the cross-sectional area of ​​the arm section. However, the increased cross-sectional area makes the disassembly and transportation of the truss arm extremely inconvenient, especially for road transportation. The width, height and length of the transport parts are strictly limited, which restricts the increase in the cross-sectional area of ​​the truss arm section. Therefore, ensuring that the truss arm has sufficient lifting performance while meeting the restrictions on the transportation size of the truss arm in transportation regulations has become a key issue restricting the development of crawler cranes.

[0003] like Figure 1 As shown, the relevant truss boom sections often achieve changes in the cross-sectional area of ​​the section through webs that can slide at both ends. However, the web strength of the conventional slide rail connection is limited, which limits the length design of the web, making the truss boom unable to adapt to processing scenarios under large loads. In addition, in the existing deformable truss boom sections, there is also a lack of corresponding design for the articulated connectors between relatively rotatable parts, so that the articulated connectors can only bear the function of rotation but cannot effectively bear force, which also limits the range of change of the cross-sectional area of ​​the truss boom section and the load-bearing capacity of the truss boom. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a truss boom section and a crane, which can increase the variable range of the cross-sectional area of ​​the truss boom section, thereby improving the bearing capacity of the truss boom in the operating state and making transportation in the transport state more convenient; it can also strengthen the connection strength of each component in the truss boom section, so that the structure of the truss arm has a stronger bearing capacity while adapting to the deformable function.

[0005] In one aspect of the present disclosure, there is provided a truss boom section, comprising:

[0006] A pair of chord bars;

[0007] a plurality of first web members, at least one end of which is connected to the chord member; and

[0008] A plurality of second web members, at least one end of which is connected to the first web member;

[0009] Wherein, at least one of the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member is adjustable, so that the distance between the pair of chord members is adjustable.

[0010] In some embodiments, the first web member has a first end and a second end, the multiple first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and both first ends of the two adjacent first web members are rotatably connected to the same second web member, and both second ends are slidably connected to the chord, so that each of the first web member groups and the chord form a triangle with a variable internal angle.

[0011] In some embodiments, the first web member group includes at least two upper web member groups and at least two lower web member groups, and the at least two upper web member groups and the at least two lower web member groups are mirror-symmetrical relative to a reference plane, and the reference plane passes through the midpoint of the second web member and is parallel to the pair of chords.

[0012] In some embodiments, the second ends of two adjacent first web members in adjacent groups of the first web members are hinged to each other and are slidably connected to the chord rod together.

[0013] In some embodiments, the second ends of two adjacent first web members in adjacent groups of the first web members are slidably connected to the chord member at a set distance from each other.

[0014] In some embodiments, the first web member has a first end and a second end, the plurality of first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and both first ends of the two adjacent first web members are fixedly connected to the same second web member, and both second ends are fixedly connected to the chord, and the second web member includes:

[0015] The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

[0016] In some embodiments, the second web comprises:

[0017] The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

[0018] In some embodiments, when the angle of the first web member relative to the chord member is adjustable, and two adjacent first web members are connected to the second ends of the same chord member and are hinged to each other, the truss boom section further includes:

[0019] A first joint is connected to the chord and is provided with a first hinge point for connecting two adjacent first web members.

[0020] In some embodiments, two first hinge points are disposed on the first joint, and a distance between the two first hinge points is fixed.

[0021] In some embodiments, the truss boom section further comprises:

[0022] The second joint is connected to the second web member and has a second hinge point for connecting the first ends of the two adjacent first web members so that the two adjacent first web members can rotate around the first ends.

[0023] In some embodiments, the second joints may be fixedly installed at two ends of the second web respectively, and each of the second joints is provided with two second hinge points, and the distance between the two second hinge points is fixed.

[0024] In some embodiments, the second joint is integrally provided on the second web member so that the second web member has a third hinge point for rotatably connecting to the first web member.

[0025] In some embodiments, the second belly bar has two third hinge points, and two of the first belly bars located at a diagonal position in the upper belly bar group and the lower belly bar group are fixedly connected to the second belly bar, and two of the first belly bars located at another diagonal position in the upper belly bar group and the lower belly bar group are rotatably connected to the second belly bar via the third hinge points.

[0026] In some embodiments, the second web comprises:

[0027] A first hinged arm has a hollow structure, and two ends thereof are respectively connected to two of the first web members located at a diagonal position in the upper web member group and the lower web member group; and

[0028] The second articulated arm passes through the cavity structure of the first articulated arm and is hinged to the cavity structure together with the first articulated arm, and two ends of the second articulated arm are respectively connected to two of the first web bars located at another diagonal position in the upper web bar group and the lower web bar group.

[0029] In some embodiments, the truss boom section further comprises:

[0030] A limiting device is used to limit adjustable parameters such as the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member, so as to fix the distance between the pair of chord members so as to maintain the arm section in a set size state.

[0031] In another aspect of the present disclosure, a crane is provided, comprising a lattice boom, wherein the lattice boom comprises a lattice boom section as described in any one of the above embodiments.

[0032] Therefore, according to the embodiment of the present disclosure, the truss boom section can at least increase the variable range of the cross-sectional area of ​​the truss boom section, thereby improving the bearing capacity of the truss boom in the operating state and making transportation in the transport state more convenient; it can also strengthen the connection strength of each component in the truss boom section, so that the structure of the truss arm has a stronger bearing capacity while adapting to the deformable function. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0035] Figure 1 It is a schematic diagram of the process of a truss boom section changing from a working state to a transportation state in the prior art;

[0036] Figure 2 is a schematic structural diagram of a truss boom section according to some embodiments of the present disclosure;

[0037] Figure 3 is a schematic structural diagram of a truss boom section according to some embodiments of the present disclosure;

[0038] Figure 4 is a schematic structural diagram of a first joint according to some embodiments of the present disclosure;

[0039] Figure 5 is a schematic structural diagram of a first joint according to some embodiments of the present disclosure;

[0040] Figure 6 is a schematic structural diagram of a first joint according to some embodiments of the present disclosure;

[0041] Figure 7 is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0042] Figure 8 is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0043] Fig. 9 is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0044] Fig.10 is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0045] Fig.11 is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0046] Fig.12is a schematic structural diagram of a second joint according to some embodiments of the present disclosure;

[0047] In the figure:

[0048] 1. chord, 2. web, 21. first web, 22. second web, 3. first web group, 31. upper web group, 32. lower web group, 4. first joint, 41. first hinge point, 5. second joint, 51. second hinge point, 52. third hinge point, 61. first articulated arm, 62. second articulated arm.

[0049] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0050] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0051] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0053] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0055] like Figures 2-3 As shown, in one aspect of the present disclosure, a truss boom section is provided, comprising:

[0056] A pair of chord bars;

[0057] a plurality of first web members, at least one end of which is connected to the chord member; and

[0058] A plurality of second web members, at least one end of which is connected to the first web member;

[0059] Wherein, at least one of the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member is adjustable, so that the distance between the pair of chord members is adjustable.

[0060] The present application introduces a plurality of second web members between a pair of the chords, and connects the first web members via the second web members, thereby removing the restriction that the two ends of the first web member need to be respectively connected to a pair of the chords, thereby avoiding the deformation range of the truss boom section being limited by the strength of the first chord itself and the connection strength between the first chord and the chord, so that the truss boom section can expand the variation range of its own cross-sectional area by reasonably setting the second chord, thereby obtaining better bearing capacity.

[0061] Specifically, if Figure 1 As shown, the existing deformable truss arm achieves its supporting effect by providing a plurality of slidably connected webs between a pair of chords. During the deformation of the truss arm section, the webs connected to the two ends of the chord slide through the slide rails provided on the chord, and at the same time, the angle between the two webs hinged to each other changes, so that the distance between the pair of chords changes accordingly.

[0062] It can be seen that, for the existing deformable truss boom section, the slide and the hinge shaft are the key structures to achieve the change of cross-sectional area; and when the truss boom section is in working condition, especially under a large load, the structure of the slide and the hinge shaft limits the length of the web (a longer web may be severely deflected under a heavy load, so that the forces on the slide and the hinge shaft are no longer in the direction of the normal state, which can easily lead to structural failure of the slide and the hinge shaft), and the load-bearing capacity of the truss boom section is determined by the cross-sectional area. Therefore, it is difficult for the existing deformable truss boom section to reach a larger cross-sectional area, and the load-bearing capacity is limited.

[0063] The present application connects the first web member through the second web member, so that the same first web member does not need to be connected to a pair of the chord members at the same time, and can increase the spacing variation range of the pair of the chord members within the allowable length range of the first web member and the second web member, so that the truss arm section has better load-bearing capacity when the cross-sectional area is large, and has better passability when the cross-sectional area is small.

[0064] In addition, the second web member can also make the change of the truss boom section no longer restricted by the slide and hinge axis of the existing deformable truss arm. For example, even if no slide rail is arranged between the first web member and the chord, the truss boom section can realize the change of its own cross-sectional area by changing the length of the second web member.

[0065] Of course, in order to obtain a larger range of variation and a more flexible variation method for the cross-sectional area of ​​the truss boom section, four adjustable parameters, namely, the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member, can be adjustable individually or in combination with each other.

[0066] Furthermore, in order to achieve stable support for the chord, in some embodiments, the first web member has a first end and a second end, the multiple first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and both first ends of the two adjacent first web members are rotatably connected to the same second web member, and both second ends are slidably connected to the chord, so that each of the first web member groups and the chord forms a triangle with a variable internal angle.

[0067] Wherein, the two first ends of the two adjacent first webs are rotatably connected to the same second web, and the two second ends are slidably connected to the chord, so that no matter what cross-sectional area the truss arm section is in, a triangular stable connection relationship can be formed between the first web group and the chord.

[0068] Furthermore, in order to make the force on the truss boom section more uniform, in some embodiments, the first web member group includes at least two upper web member groups and at least two lower web member groups, and the at least two upper web member groups and the at least two lower web member groups are mirror-symmetrical with respect to a reference plane, and the reference plane passes through the midpoint of the second web member and is parallel to the pair of chords.

[0069] Further, such as Figure 3 As shown, in some embodiments, the second ends of two adjacent first web members in adjacent groups of the first web members are hinged to each other and are slidably connected to the chord rod together.

[0070] The second ends of the first webs are hinged to each other and slidably connected to the chord, which can simplify the connection structure between the first webs and the chord, making the truss boom section more reliable; at the same time, a hexagonal support structure can be formed between two adjacent second webs by two groups of first webs hinged to each other, so that the truss boom section has both deformable flexibility and stable support.

[0071] Furthermore, in order to expand the variable range of the transverse area of ​​the truss boom section, as Figure 2 As shown, in some embodiments, the second ends of two adjacent first web members of adjacent first web members between the groups are slidably connected to the chord member at a set distance from each other.

[0072] At this time, between two adjacent second web members, an octagonal support structure is formed by two groups of first web members hinged to each other, which enables the truss boom section to obtain a larger deformation range and deformation flexibility.

[0073] Further, when the length of the second web member is changed, the angle between the first web member and the chord member may remain unchanged: in some embodiments, the first web member has a first end and a second end, the plurality of first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and both first ends of the two adjacent first web members are fixedly connected to the same second web member, and both second ends are fixedly connected to the chord member, and the second web member includes:

[0074] The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

[0075] Accordingly, when the length of the second web member is changed, the angle between the first web member and the chord member may also be changed, so that the truss boom section obtains a larger deformable range: In some embodiments, the second web member includes:

[0076] The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

[0077] like Figure 4 As shown, further, in order to realize a reliable connection between the chord and the web, in some embodiments, when the angle of the first web relative to the chord is adjustable, and two adjacent first webs are connected to the second ends of the same chord and are hinged to each other, the truss boom section further includes:

[0078] A first joint is connected to the chord and is provided with a first hinge point for connecting two adjacent first web members.

[0079] like Figures 5-6 As shown, further, when a single hinge point cannot meet the connection strength of the first joint to simultaneously connect the two first chords, in some embodiments, two first hinge points are provided on the first joint, and the distance between the two first hinge points is fixed.

[0080] The two first hinge points with a fixed distance can not only effectively ensure the connection strength of each of the two first hinge points, but also make the overall structure of the first joint more reliable, avoiding the shear stress concentration caused by a single hinge point or the close distance between the two first hinge points.

[0081] like Figure 7 As shown, further, in order to achieve a reliable connection between the first web member and the second web member, in some embodiments, the truss boom section further includes:

[0082] The second joint is connected to the second web member and has a second hinge point for connecting the first ends of the two adjacent first web members so that the two adjacent first web members can rotate around the first ends.

[0083] like Figure 8 As shown, in order to ensure that the strength of the second joint meets the requirements and avoid excessive concentration of shear stress on the second hinge point by the two first web members arranged at the same second hinge point, in some embodiments, the second joint can be fixedly installed at both ends of the second web member, respectively, and each second joint is provided with two second hinge points, and the distance between the two second hinge points is fixed.

[0084] like Figures 9-10 As shown, in order to simplify the connection structure between the second joint and the second web, in some embodiments, the second joint is integrally provided on the second web so that the second web has a third hinge point for rotatably connecting to the first web.

[0085] Fig. 9 and Fig.10 The structures in which the second web member is integrated with the second joint at different length states are respectively shown. Fig. 9 The second web is shown to be longer, while Fig.10 The second web member shown in the figure is shorter. When the second web member is shorter, the two groups of the first web members connected by the second web member present a relatively obvious diagonal relationship, that is, the four first web members of the upper web member group and the lower web member group are arranged in an X shape. At this time, in order to simplify the connection structure on the second web member while ensuring the connection strength of the third hinge point, the present application provides the following Figures 11-12 Two embodiments are shown.

[0086] like Fig.11 As shown, in some embodiments, the second belly bar has two third hinge points, and two of the first belly bars located at a diagonal position in the upper belly bar group and the lower belly bar group are fixedly connected to the second belly bar, and two of the first belly bars located at another diagonal position in the upper belly bar group and the lower belly bar group are rotatably connected to the second belly bar via the third hinge points.

[0087] And as Fig.12 As shown, in some embodiments, the second web comprises:

[0088] A first hinged arm has a hollow structure, and two ends thereof are respectively connected to two of the first web members located at a diagonal position in the upper web member group and the lower web member group; and

[0089] The second articulated arm passes through the cavity structure of the first articulated arm and is hinged to the cavity structure together with the first articulated arm, and two ends of the second articulated arm are respectively connected to two of the first web bars located at another diagonal position in the upper web bar group and the lower web bar group.

[0090] Furthermore, in order to maintain the cross-sectional area state of the truss boom section, in some embodiments, the truss boom section further comprises:

[0091] A limiting device is used to limit adjustable parameters such as the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member, so as to fix the distance between the pair of chord members so as to maintain the arm section in a set size state.

[0092] Furthermore, in another aspect of the present disclosure, a crane is provided, comprising a truss boom, wherein the truss boom comprises a truss boom section as described in any of the foregoing embodiments.

[0093] Therefore, according to the embodiment of the present disclosure, the truss boom section can at least increase the variable range of the cross-sectional area of ​​the truss boom section, thereby improving the bearing capacity of the truss boom in the operating state and making transportation in the transport state more convenient; it can also strengthen the connection strength of each component in the truss boom section, so that the structure of the truss arm has a stronger bearing capacity while adapting to the deformable function.

[0094] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0095] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A truss boom section, characterized in that: include: A pair of chord bars; A plurality of first web members, at least one end of which is connected to the chord member; as well as A plurality of second web members, at least one end of which is connected to the first web member; Wherein, at least one of the angle of the first web member relative to the chord member and the length of the second web member is adjustable, and both first ends of two adjacent first web members are rotatably connected to the same second web member, so that the distance between the pair of chord members is adjustable; The truss boom section also includes: a second joint connected to the second web member, having a second hinge point, used to connect the first ends of the two adjacent first web members so that the two adjacent first web members can rotate around the first ends, the second joint can be fixedly mounted on the two ends of the second web member, each of the second joints is provided with two second hinge points, and the distance between the two second hinge points is fixed; The angle of the first web member relative to the chord member is adjustable, and two adjacent first web members are connected to the second end of the same chord member and are hinged to each other. The truss boom section also includes a first joint, which is connected to the chord member and is provided with a first hinge point for connecting two adjacent first web members; wherein, two first hinge points are provided on the first joint, and the spacing between the two first hinge points is fixed.

2. The truss boom section according to claim 1, characterized in that: The first web member has a first end and a second end, the multiple first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and at least one of the angle of the second web member relative to the first web member and the length of the first web member is adjustable, and both second ends of the two adjacent first web members are slidably connected to the chord member so that each of the first web member groups and the chord member form a triangle with a variable internal angle.

3. The truss boom section according to claim 2, characterized in that: The first web member group includes at least two upper web member groups and at least two lower web member groups, wherein the at least two upper web member groups and the at least two lower web member groups are mirror-symmetrical with respect to a reference plane, and the reference plane passes through the midpoint of the second web member and is parallel to the pair of chords.

4. The truss boom section according to claim 3, characterized in that: The second ends of two adjacent first web members in adjacent first web member groups are hinged to each other and are slidably connected to the chord rod together.

5. The truss boom section according to claim 3, characterized in that: The second ends of two adjacent first web members of adjacent first web member groups are slidably connected to the chord member at a set distance from each other.

6. The truss boom section according to claim 1, characterized in that: The first web member has a first end and a second end, the plurality of first web members include at least two first web member groups, each of the first web member groups includes two adjacent first web members, and both first ends of the two adjacent first web members are fixedly connected to the same second web member, and both second ends are fixedly connected to the chord member, and the second web member includes: The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

7. The truss boom section according to claim 2, characterized in that: The second web member comprises: The telescopic cylinder is used to adjust the length of the second web member so that the distance between the pair of chord members can be adjusted.

8. The truss boom section according to claim 1, characterized in that: The second joint is integrally arranged on the second web member so that the second web member has a third hinge point for rotatably connecting to the first web member.

9. The truss boom section according to claim 8, characterized in that: The second web member has two third hinge points, and two of the first web members located at a diagonal position in the upper web member group and the lower web member group are fixedly connected to the second web member, and two of the first web members located at another diagonal position in the upper web member group and the lower web member group are rotatably connected to the second web member via the third hinge points.

10. The truss boom section according to claim 8, characterized in that: The second web member comprises: A first hinged arm has a hollow structure, and two ends thereof are respectively connected to two of the first web members located at a diagonal position in the upper web member group and the lower web member group; and The second articulated arm passes through the cavity structure of the first articulated arm and is hinged to the cavity structure together with the first articulated arm, and two ends of the second articulated arm are respectively connected to two of the first web bars located at another diagonal position in the upper web bar group and the lower web bar group.

11. The truss boom section according to claim 1, characterized in that: The truss boom section also includes: A limiting device is used to limit adjustable parameters such as the angle of the first web member relative to the chord member, the angle of the second web member relative to the first web member, the length of the first web member and the length of the second web member, so as to fix the distance between the pair of chord members so as to maintain the arm section in a set size state.

12. A crane, characterized in that: It comprises a truss arm, wherein the truss arm comprises a truss arm section as described in any one of claims 1 to 11.

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