Telescopic boom and its plug pin mechanism and method of operation and engineering machine

Abstract

The present application relates to the field of telescopic arms, and discloses a telescopic arm, a plug-in pin mechanism and an operating method thereof, and a construction machine, the plug-in pin mechanism comprising a body part, a telescopic oil cylinder, a connecting piece, a curved arm, a cylinder pin and a mechanical lock, the telescopic oil cylinder being capable of driving the connecting piece and the mechanical lock to move along a second direction between a lower position and a higher position, at the lower position, the connecting piece drives the arm pin to move along a third direction to a first unlocking position through the curved arm, the mechanical lock restricts the cylinder pin from moving along the third direction from a second locking position to a second unlocking position, at the higher position, the connecting piece drives the arm pin to move along the third direction to a first locking position through the curved arm, and the mechanical lock allows the cylinder pin to move along the third direction from the second locking position to the second unlocking position. Through the above technical solution, the telescopic oil cylinder, the curved arm and the mechanical lock cooperate with each other to realize the locking and unlocking of the arm pin and the cylinder pin, thereby simplifying the structure, improving the operation efficiency, and prolonging the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of telescopic arms, in particular to a plug-in pin mechanism of a telescopic arm, further to a telescopic arm, further to a method of operating a telescopic arm, and further to a working machine. BACKGROUND

[0002] At present, large-tonnage telescopic crane mainly adopts single-cylinder plug-in pin mechanism, which is divided into top single-arm pin and side double-arm pin two ways. The cylinder pin is connected with the telescopic arm for driving the telescopic arm to stretch or retract, and the arm pin is used for connecting two adjacent telescopic arms. The plug-in pin mechanism is a key component of the telescopic arm, which acts frequently during the stretching and retracting of the telescopic arm, and the working condition is complex. The stability of the movement directly affects the stretching and retracting efficiency of the telescopic arm.

[0003] In the prior art, the plug-in and pull-out actions of the cylinder pin and the arm pin of the side pin plug-in pin mechanism are generally controlled by two groups of external oil cylinders and multiple groups of springs. One group of horizontal oil cylinders controls the plug-in and pull-out action of the cylinder pin through left and right movement, and the other group of horizontal oil cylinders controls the plug-in and pull-out action of the arm pin through forward and backward movement. In order to realize the switching between the locking state of the cylinder pin and the locking state of the arm pin in the telescopic arm, and to have the interlocking function, a large number of parts are connected between the two groups of oil cylinders, which requires high machining process, resulting in a very complex cylinder head structure. Moreover, double-cavity oil supply through hydraulic tracking pipe is required, the oil way is long, and there are many fault points. SUMMARY

[0004] The purpose of the present application is to provide a plug-in pin mechanism of a telescopic arm to solve the problems of complex structure and easy to malfunction.

[0005] In order to achieve the above-mentioned purpose, the present application provides a plug-in pin mechanism of a telescopic arm, wherein the plug-in pin mechanism comprises a body part provided with a mounting hole in a first direction for accommodating a driving oil cylinder to pass through, a telescopic oil cylinder arranged on the body part, a connecting piece connected to the telescopic oil cylinder, a two-section curved arm, a cylinder pin, and a mechanical lock connected to the connecting piece. The first end of the curved arm is hinged to the connecting piece, and the bending part of the curved arm is rotatably hinged to the body part. The telescopic oil cylinder can drive the connecting piece and the mechanical lock to move along a second direction between a lower position and a higher position. In the lower position, the connecting piece drives the arm pin to move to a first unlocking position along a third direction through the curved arm, and the mechanical lock restricts the cylinder pin to move from a second locking position to a second unlocking position along the third direction. In the higher position, the connecting piece drives the arm pin to move to a first locking position along the third direction through the curved arm, and the mechanical lock allows the cylinder pin to move from the second locking position to the second unlocking position along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0006] In some embodiments, the movement of the connecting member can drive the second end of the curved arm to swing in a third direction.

[0007] In some embodiments, the telescopic oil cylinder extends in a second direction, and the telescopic oil cylinder comprises a cylinder body, a piston rod, and a first elastic member arranged between the piston rod and the cylinder body, the elastic member can drive the piston rod to retract to drive the connecting member to move to a lower position.

[0008] In some embodiments, the curved arms are arranged in pairs and symmetrically about a central axis in the second direction.

[0009] In some embodiments, the body part is provided with a moving cavity partially accommodating the cylinder pin and an oil cavity communicating with the moving cavity, and hydraulic oil can be injected into the oil cavity to drive the cylinder pin to move from the second locking position to the second unlocking position.

[0010] In some embodiments, a second elastic member is arranged between the cylinder pin and the body part, and the second elastic member can drive the cylinder pin to move from the second unlocking position to the second locking position.

[0011] In another aspect, the present application provides a telescopic arm, which is provided with a plurality of arm sections arranged in sequence, an arm pin arranged on the arm section, a driving oil cylinder, and the plug-in pin mechanism of the telescopic arm as described above.

[0012] In some embodiments, the telescopic arm is provided with a third elastic member between the arm section and the arm pin.

[0013] In some embodiments, the telescopic arm is provided with a transmission member connected to the arm pin, and the lower side of the transmission member is provided with a groove accommodating the second end of the curved arm.

[0014] In addition, the present application also provides an operation method of a telescopic arm, the telescopic arm being the telescopic arm as described above,

[0015] The operation method comprises: causing the telescopic oil cylinder to extend, driving the curved arm and the mechanical lock through the connecting member, the curved arm driving the transmission member to move from a first unlocking position to a first locking position to lock the arm pin, and then driving the cylinder pin to move from a second locking position to a second unlocking position to unlock the driving oil cylinder; and / or

[0016] The operation method comprises: driving the cylinder pin to move from the second unlocking position to the second locking position, then shortening the telescopic oil cylinder, driving the curved arm and the mechanical lock through the connecting piece, the curved arm driving the transmission member to move from the first locking position to the first unlocking position to unlock the arm pin, and the mechanical lock limiting the cylinder pin to move from the second locking position to the second unlocking position.

[0017] In addition, the present application also provides an engineering machine, wherein the engineering machine is provided with the telescopic arm described in the above solution.

[0018] Through the above technical solution, the telescopic oil cylinder, the curved arm and the mechanical lock cooperate with each other to realize the locking and unlocking of the arm pin and the cylinder pin, simplify the structure, improve the operation efficiency, and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure diagram of the plug-in pin mechanism of the telescopic arm described in the embodiment of the present application;

[0020] Figure 2 is a partial cross-sectional view of the telescopic oil cylinder part of Figure 1

[0021] Figure 3 is a partial cross-sectional view of the cylinder pin part of Figure 1

[0022] Figure 4 is a cross-sectional view of the telescopic arm described in the embodiment of the present application, wherein the arm pin is in the first locking position;

[0023] Figure 5 is a cross-sectional view of the telescopic arm described in the embodiment of the present application, wherein the arm pin is in the first unlocking position.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1-body part, 2-cylinder pin, 3-transmission member, 4-curved arm, 5-mechanical lock, 6-connecting piece, 7-piston rod, 8-cylinder body, 9-first elastic member, 10-second elastic member, 11-arm pin, 12-driving oil cylinder, 13-telescopic oil cylinder, 14-arm section, 15-oil cavity, 16-third elastic member. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0027] ​​The present application provides a telescopic arm plug pin mechanism, comprising a body part 1 provided with a mounting hole in a first direction for accommodating a driving oil cylinder 12, a telescopic oil cylinder 13 arranged on the body part 1, a connecting piece 6 connected to the telescopic oil cylinder 13, a two-section curved arm 4, a cylinder pin 2 and a mechanical lock 5 connected to the connecting piece 6, the curved arm 4 is rotatably hinged to the connecting piece 6, the bending part of the curved arm 4 is rotatably hinged to the body part 1, the telescopic oil cylinder 13 can drive the connecting piece 6 and the mechanical lock 5 to move along a second direction between a lower position and a higher position, in the lower position, the connecting piece 6 drives an arm pin 11 to move along a third direction to a first unlocking position through the curved arm 4, the mechanical lock 5 restricts the cylinder pin 2 to move along the third direction from a second locking position to a second unlocking position, in the higher position, the connecting piece 6 drives the arm pin 11 to move along the third direction to a first locking position through the curved arm 4, the mechanical lock 5 allows the cylinder pin 2 to move along the third direction from the second locking position to the second unlocking position, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0028] The telescopic plug pin mechanism of the present application is used to control the unlocking and locking of the arm pin 11 and the cylinder pin 2 in the telescopic arm, so as to control the movement and relative fixation of the arm sections.

[0029] In the present application, the first direction is the telescopic direction of the driving oil cylinder 12, corresponding to the telescopic direction of the arm sections, the third direction corresponds to the movement direction of the arm pin 11 and the cylinder pin 2, and the second direction is the movement direction of the telescopic oil cylinder 13.

[0030] The cylinder pin 2 is used to lock the driving oil cylinder 12 on the selected arm section, and the arm pin is used to lock the adjacent two arm sections. Of course, the cylinder pin 2 and the arm pin 11 can be unlocked from the locking position to unlock the corresponding structure.

[0031] The telescopic oil cylinder 13 provides power for the locking and unlocking of the arm pin 11 and the cylinder pin 2.

[0032] The connecting piece 6 and the curved arm 4 are transmission structures, the curved arm 4 generally comprises two sections, the connecting point between which is rotatably hinged to the body part 1, the first end of which is hinged to the connecting piece 6, and the other end can act on the arm pin 11. When the body part 1 moves along the length direction of the telescopic arm to the appropriate position following the driving oil cylinder 12, the curved arm 4 also moves to the position that can act on the arm pin 11.

[0033] When the telescopic cylinder 13 moves upward in the second direction, the connecting member 6 can reach a higher position. The movement of the connecting member 6 can drive the bending arm 4 to rotate relative to the main body 1. The second end of the bending arm 4 swings under rotation, thereby driving the arm pin 11 from the first unlocking position to the first locking position. In addition, the connecting member 6 also drives the mechanical lock 5 to move upward to the second unlocking position, thereby allowing the cylinder pin 2 to move to the unlocking position, so that the drive cylinder 12 and the arm section 14 can be disengaged from each other. Conversely, when the telescopic cylinder 13 moves downward in the second direction, the transmission member 3 can move from the first locking position to the first unlocking position through the connecting member 6 and the bending arm 4, and the mechanical lock 5 can also move to the second locking position to restrict the cylinder pin 2 from moving to the unlocking position.

[0034] The movement of the connector 6 can cause the second end of the bent arm 4 to swing in a third direction. (Reference) Figure 1 As shown, the up-down direction corresponds to the second direction, and the left-right direction corresponds to the third direction. The first end of the curved arm 4 has a relatively low height, while the second end has a relatively high height. When the first end moves approximately along the second direction, the second end can move along the third direction. It should be noted that the first end of the curved arm 4 can be connected to the connecting member 6 via a pin. The connecting member 6 has a strip-shaped hole along the third direction because when the curved arm 4 rotates relative to the body part 1, its first end moves both up-down and left-right.

[0035] Among them, reference Figure 2 As shown, the telescopic cylinder 13 extends along a second direction. The telescopic cylinder 13 includes a cylinder body 8, a piston rod 7, and a first elastic element 9 disposed between the piston rod 7 and the cylinder body 8. The elastic element can drive the piston rod 7 to retract, thereby driving the connecting member 6 to a lower position. When hydraulic oil is injected into the cylinder body 8, the piston rod 7 can be driven to extend, thereby driving the connecting member 6 to a higher position; when pressure is released in the cylinder body 8, the first elastic element 9 can cause the piston rod 7 to retract, thereby driving the connecting member 6 to a lower position. In other embodiments, the piston rod 7 can also be configured to extend via the first elastic element 9 and retract via the injection of hydraulic oil; or, both the extension and retraction of the piston rod 7 can be achieved by the injection of hydraulic oil.

[0036] refer to Figure 1 As shown, a mounting hole is provided at the center of the main body 1. The telescopic cylinder 13 is located on one side of the mounting hole along a third direction, and the bending arm 4 is located at the top of the mounting hole along a second direction. Therefore, a connector 6 with a suitable structure is required to realize the transmission between the telescopic cylinder 13 and the bending arm 4. A guide rail can also be provided on the main body 1 to guide the movement of the connector 6 along the second direction.

[0037] In addition, the curved arms 4 are arranged in pairs and symmetrically about a central axis in the second direction. Referring to Figure 1 As shown, two arm pins 11 are symmetrically arranged on each arm section 14, and therefore two curved arms 4 are correspondingly arranged to synchronously drive the two arm pins 11 to move between the first unlocking position and the first locking position.

[0038] The body part 1 is provided with a moving cavity partially accommodating the cylinder pin 2 and an oil cavity 15 communicating with the moving cavity, and the oil cavity 15 can inject hydraulic oil to drive the cylinder pin 2 to move from the second locking position to the second unlocking position. Referring to Figure 3 As shown, the body part 1 is formed with a moving cavity accommodating the movement of the cylinder pin 2, and the cylinder pin 2 is partially exposed from the moving cavity. Wherein, one end of the cylinder pin 2 located in the moving cavity is provided with a flange, and the injection of hydraulic oil into the oil cavity 15 can drive the flange, i.e. the cylinder pin 2, to move from the second locking position to the second unlocking position. In addition, the mechanical lock 5 can be inserted into the moving cavity to limit the movement of the cylinder pin 2 from the second locking position to the second unlocking position.

[0039] Further, the second elastic member 10 is arranged between the cylinder pin 2 and the body part 1, which can drive the cylinder pin 2 to move from the second unlocking position to the second locking position. That is, when the oil cavity 15 is depressurized, the cylinder pin 2 can be kept in the second locking position by the elastic action of the second elastic member 10. In other embodiments, the cylinder pin 2 can also be kept in the second unlocking position by the elastic member, and the cylinder pin 2 can be driven to move to the second locking position by hydraulic oil.

[0040] On the other hand, referring to Figure 4 and Figure 5 As shown, the present scheme also provides a telescopic arm, wherein the telescopic arm is provided with a plurality of arm sections 14 arranged in sequence, an arm pin 11 arranged on the arm section 14, a drive oil cylinder 12, and the plug-in pin mechanism of the telescopic arm described in the above scheme. The arm pin 11 can be arranged on the arm section 14 other than the outermost arm section, which can lock the inner arm section 14 to the adjacent outer arm section 14. The plug-in lock mechanism is arranged on the drive oil cylinder 12, the piston rod of the drive oil cylinder 12 can be connected to the innermost arm section 14, the body part 1 is arranged on the cylinder body of the drive oil cylinder 12, and the plug-in lock mechanism can selectively unlock the arm pin 11 on a certain arm section 14 and lock the cylinder pin to the adjacent outer arm section 14, so as to drive the relative movement between the two adjacent arm sections 14, including extension and retraction.

[0041] In addition, the telescopic arm is provided with a third elastic member 16 between the arm section 14 and the arm pin 11.

[0042] The telescopic arm is provided with a transmission member 3 connected to the arm pin 11, and the lower side of the transmission member 3 is provided with a groove for accommodating the second end of the curved arm 4. The transmission member 3 is provided corresponding to each arm pin 11 to provide transmission for the arm pin 11 and the curved arm 4. Referring to Figure 1 When the driving oil cylinder 12 is driven to move in the first direction and the body part 1 is also moved synchronously, the curved arm 4 can enter or leave the groove of the transmission member 3 in the first direction, that is, only when the body part 1 is moved to a specific position in the first direction, the second end of the curved arm 4 is in the groove, and the transmission member 3 can be driven to move, thereby driving the arm pin 11 to move through the transmission member 3.

[0043] On the other hand, the present scheme provides an operation method of a telescopic arm, the telescopic arm being the telescopic arm described in the above scheme,

[0044] The operation method includes: driving the telescopic oil cylinder 13 to extend, driving the curved arm 4 and the mechanical lock 5 through the connecting member 6, the curved arm 4 driving the transmission member 3 to move from the first unlocking position to the first locking position to lock the arm pin 11, and then driving the cylinder pin 2 to move from the second locking position to the second unlocking position to unlock the driving oil cylinder 12; and / or

[0045] The operation method includes: driving the cylinder pin 2 to move from the second unlocking position to the second locking position, and then driving the telescopic oil cylinder 13 to shorten, driving the curved arm 4 and the mechanical lock 5 through the connecting member 6, the curved arm 4 driving the transmission member 3 to move from the first locking position to the first unlocking position to unlock the arm pin 11, and the mechanical lock 5 limiting the movement of the cylinder pin 2 from the second locking position to the second unlocking position.

[0046] On the one hand, when locking the arm pin 11, the locking of the arm pin 11 needs to be completed first, and the mechanical lock 5 needs to be moved to a position not limiting the cylinder pin 2, so that the cylinder pin 2 can be moved from the second locking position to the second unlocking position.

[0047] On the other hand, when unlocking the arm pin 11, the cylinder pin 2 needs to be moved to the second locking position first, so that the driving oil cylinder 12 is locked with the corresponding arm section 14, and then the telescopic oil cylinder 13 drives the arm pin 11 to move from the first locking position to the first unlocking position.

[0048] In addition, the present scheme also provides an engineering machine, wherein the engineering machine is provided with the telescopic arm described in the above scheme. The engineering machine can be a crane, a concrete delivery vehicle, etc.

[0049] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A plug-in / plug-out pin mechanism for a telescopic arm, characterized in that, The insertion and removal pin mechanism includes a body part (1) with a mounting hole in a first direction for accommodating a drive cylinder (12) through which it passes, a telescopic cylinder (13) mounted on the body part (1), a connector (6) connected to the telescopic cylinder (13), a two-section bending arm (4), a cylinder pin (2), and a mechanical lock (5) connected to the connector (6). The first end of the bending arm (4) is hinged to the connector (6), and the bent portion of the bending arm (4) is rotatably hinged to the body part (1). The telescopic cylinder (13) can drive the connector (6) and the mechanical lock (5) to move in a second direction between a lower position and a higher position. In the lower position, the connector (6) is moved by the bending arm (12). 4) The arm pin (11) is moved to the first unlock position along the third direction. The mechanical lock (5) restricts the cylinder pin (2) from the second locked position to the second unlock position along the third direction. At the higher position, the connector (6) drives the arm pin (11) to the first locked position along the third direction through the bent arm (4). The mechanical lock (5) allows the cylinder pin (2) to move from the second locked position to the second unlock position along the third direction. The first direction, the second direction and the third direction are perpendicular to each other. The movement of the connector (6) can drive the second end of the bent arm (4) to swing along the third direction. The bent arms (4) are arranged in pairs and symmetrical about the central axis along the second direction.

2. The insertion and removal pin mechanism of the telescopic arm according to claim 1, characterized in that, The telescopic cylinder (13) extends along a second direction and includes a cylinder body (8), a piston rod (7), and a first elastic member (9) disposed between the piston rod (7) and the cylinder body (8). The elastic member is capable of driving the piston rod (7) to retract so as to drive the connecting member (6) to move to a lower position.

3. The insertion and removal pin mechanism of the telescopic arm according to claim 1, characterized in that, The main body (1) is provided with a movable cavity that partially accommodates the cylinder pin (2) and an oil cavity that communicates with the movable cavity. Hydraulic oil can be injected into the oil cavity to push the cylinder pin (2) from the second locked position to the second unlocked position.

4. The insertion and removal pin mechanism of the telescopic arm according to claim 3, characterized in that, A second elastic element (10) is provided between the cylinder pin (2) and the body part (1), and the second elastic element (10) can drive the cylinder pin (2) to move from the second unlock position to the second lock position.

5. A telescopic arm, characterized in that, The telescopic arm is provided with a plurality of arm sections (14) that are sequentially nested together, an arm pin (11) disposed on the arm section (14), a drive cylinder (12), and a plug-in pin mechanism for the telescopic arm as described in any one of claims 1-4.

6. The telescopic arm according to claim 5, characterized in that, The telescopic arm is provided with a third elastic element (16) located between the arm section (14) and the arm pin (11).

7. The telescopic arm according to claim 5, characterized in that, The telescopic arm is provided with a transmission member (3) connected to the arm pin (11), and the lower side of the transmission member (3) is provided with a groove for accommodating the second end of the curved arm (4) to be inserted.

8. A method for operating a telescopic boom, characterized in that, The telescopic arm is the telescopic arm as described in claim 7. The operation method includes: extending the telescopic cylinder (13), driving the bending arm (4) and the mechanical lock (5) through the connector (6), the bending arm (4) driving the transmission member (3) from the first unlocking position to the first locking position to lock the arm pin (11), and then driving the cylinder pin (2) from the second locking position to the second unlocking position to unlock the drive cylinder (12); and / or The operation method includes: driving the cylinder pin (2) from the second unlock position to the second lock position, then causing the telescopic cylinder (13) to shorten, driving the bending arm (4) and the mechanical lock (5) through the connector (6), the bending arm (4) driving the transmission member (3) to move from the first lock position to the first unlock position to unlock the arm pin (11), and the mechanical lock (5) restricting the cylinder pin (2) from moving from the second lock position to the second unlock position.

9. An engineering machinery, characterized in that, The engineering machinery is equipped with a telescopic boom as described in any one of claims 5-7.

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