阅读说明：本技术 伸缩臂及包括伸缩臂的起重机 (Telescopic boom and crane comprising same ) 是由 仝进科 丁兆义 米勇 张喜逢 侯树生 魏志鹏 刘义 于 2019-11-07 设计创作，主要内容包括：本发明公开了一种伸缩臂,包括伸缩油缸、一级臂筒、二级臂筒、插拔销机构、一级臂筒尾部机构和二级臂筒尾部机构,插拔销机构与伸缩油缸的缸筒连接并包括底座、缸销外筒、缸销、臂销推杆,缸销外筒和缸销之间以及缸销和臂销推杆之间均设有环形腔和密封件,形成二级伸缩油缸；一级臂筒尾部机构与一级臂筒刚性连接,二级臂筒尾部机构与二级臂筒刚性连接,一级臂筒尾部机构和二级臂筒尾部机构上均设有缸销孔,缸销孔与缸销在水平方向连接；一级臂筒尾部机构和二级臂筒尾部机构上均设有臂销杠杆、臂销和复位弹簧,一级臂筒和二级臂筒上均设有臂销孔,臂销在臂销杠杆的作用下可以拔出臂销孔或者在复位弹簧的作用下插入臂销孔。(The invention discloses a telescopic arm which comprises a telescopic oil cylinder, a primary arm cylinder, a secondary arm cylinder, a pin inserting and pulling mechanism, a primary arm cylinder tail mechanism and a secondary arm cylinder tail mechanism, wherein the pin inserting and pulling mechanism is connected with a cylinder barrel of the telescopic oil cylinder and comprises a base, a cylinder pin outer cylinder, a cylinder pin and an arm pin push rod; the tail mechanism of the primary arm cylinder is rigidly connected with the primary arm cylinder, the tail mechanism of the secondary arm cylinder is rigidly connected with the secondary arm cylinder, cylinder pin holes are formed in the tail mechanism of the primary arm cylinder and the tail mechanism of the secondary arm cylinder, and the cylinder pin holes are connected with cylinder pins in the horizontal direction; arm pin levers, arm pins and reset springs are arranged on the first-stage arm cylinder tail mechanism and the second-stage arm cylinder tail mechanism, arm pin holes are formed in the first-stage arm cylinder and the second-stage arm cylinder, and the arm pins can be pulled out of the arm pin holes or inserted into the arm pin holes under the action of the arm pin levers.)

1. The utility model provides a telescopic boom, includes a telescopic cylinder, a one-level arm section of thick bamboo, a second grade arm section of thick bamboo, plug pin mechanism, a one-level arm section of thick bamboo afterbody mechanism and a second grade arm section of thick bamboo afterbody mechanism, its characterized in that:

the pin inserting and pulling mechanism is connected with a cylinder barrel of the telescopic oil cylinder and comprises a base, a cylinder pin outer barrel, a cylinder pin and an arm pin push rod, wherein annular cavities and sealing elements are arranged between the cylinder pin outer barrel and the cylinder pin and between the cylinder pin and the arm pin push rod to form a secondary telescopic oil cylinder;

the tail mechanism of the primary arm cylinder is rigidly connected with the primary arm cylinder, the tail mechanism of the secondary arm cylinder is rigidly connected with the secondary arm cylinder, cylinder pin holes are formed in the tail mechanism of the primary arm cylinder and the tail mechanism of the secondary arm cylinder, and the cylinder pin holes are connected with the cylinder pins in the horizontal direction;

the one-level arm section of thick bamboo afterbody mechanism with all be equipped with arm round pin lever, arm round pin and reset spring on the second grade arm section of thick bamboo afterbody mechanism, a one-level arm section of thick bamboo with all be equipped with the arm pinhole on the second grade arm section of thick bamboo, the arm round pin is in can extract under the effect of arm round pin lever the arm pinhole perhaps inserts under reset spring's effect the arm pinhole.

2. The telescopic arm according to claim 1, characterized in that: be equipped with first circular bead on the arm round pin push rod, the jar round pin with the position that first circular bead corresponds is equipped with first through-hole, first spacing ball has been placed in the first through-hole be equipped with jar round pin urceolus spacing groove on the jar round pin urceolus, the setting position of jar round pin urceolus spacing groove is for corresponding to the jar round pin stretches out the position of the first through-hole on it after targetting in place, still be provided with jar round pin spacing groove on the jar round pin, the base lower part is provided with spring-loaded jar round pin spacing pin, the arm round pin is provided with the lower part feeler lever, be equipped with the second circular bead on the jar round pin spacing pin, the base with jar round pin urceolus with the position that the second circular bead corresponds is equipped with the second through-hole, the spacing ball of second has been.

3. The telescopic arm according to claim 1, characterized in that: the base is provided with a retracting oil port plug and an extending oil port plug.

4. A crane, comprising a telescopic arm as claimed in any one of claims 1 to 3.

Technical Field

The invention relates to the field of engineering machinery, in particular to a telescopic boom and a crane comprising the same.

Background

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a telescopic arm which comprises a telescopic oil cylinder, a primary arm cylinder, a secondary arm cylinder, a pin inserting and pulling mechanism, a primary arm cylinder tail mechanism and a secondary arm cylinder tail mechanism, wherein the pin inserting and pulling mechanism is connected with a cylinder barrel of the telescopic oil cylinder and comprises a base, a cylinder pin outer cylinder, a cylinder pin and an arm pin push rod; the tail mechanism of the primary arm cylinder is rigidly connected with the primary arm cylinder, the tail mechanism of the secondary arm cylinder is rigidly connected with the secondary arm cylinder, cylinder pin holes are formed in the tail mechanism of the primary arm cylinder and the tail mechanism of the secondary arm cylinder, and the cylinder pin holes are connected with cylinder pins in the horizontal direction; arm pin levers, arm pins and reset springs are arranged on the first-stage arm cylinder tail mechanism and the second-stage arm cylinder tail mechanism, arm pin holes are formed in the first-stage arm cylinder and the second-stage arm cylinder, and the arm pins can be pulled out of the arm pin holes or inserted into the arm pin holes under the action of the arm pin levers.

In the telescopic boom, a first shoulder is arranged on the boom pin push rod, a first through hole is formed in the position, corresponding to the first shoulder, of the cylinder pin, a first limiting ball is placed in the first through hole, a cylinder pin outer cylinder limiting groove is formed in the cylinder pin outer cylinder, the position, corresponding to the first through hole, of the cylinder pin after the cylinder pin extends in place is arranged in the cylinder pin outer cylinder limiting groove, a cylinder pin limiting groove is further formed in the cylinder pin, a spring-loaded cylinder pin limiting pin is arranged on the lower portion of the base, a lower contact rod is arranged on the boom pin, a second shoulder is arranged on the cylinder pin limiting pin, a second through hole is formed in the positions, corresponding to the second shoulder, of the base and the cylinder pin outer cylinder, and a second limiting ball is placed in the second.

In the telescopic arm, the base is provided with a retracting oil port plug and an extending oil port plug.

In addition, the invention also provides a crane comprising the telescopic boom.

The telescopic boom realizes the interlocking of the cylinder pin and the boom pin, and the cylinder pin and the boom pin push rod have smaller size, can be arranged in the same plane of the telescopic oil cylinder, occupy smaller space, thus greatly improving the basic length and the full elongation of the telescopic boom and simultaneously improving the safety and the stability of the vertical telescopic boom crane.

Drawings

In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic view of the structure of the telescopic arm of the present invention.

Fig. 2 is a partially enlarged view of fig. 1, showing the structures of a cylinder pin and an arm pin in the telescopic arm of the present invention.

Fig. 3 is a schematic structural view of a plug pin mechanism in the telescopic arm of the present invention.

Description of reference numerals:

11-telescopic oil cylinder, 12-primary arm cylinder, 13-secondary arm cylinder, 14-pin inserting and pulling mechanism, 15-primary arm cylinder tail mechanism, 16-secondary arm cylinder tail mechanism, 21-base, 22-cylinder pin outer cylinder, 23-arm pin lever, 24-arm pin, 25-cylinder pin, 26-arm pin push rod, 33-first limit ball, 36-cylinder pin outer cylinder limit groove, 37-cylinder pin limit groove, 38-second limit ball, 39-cylinder pin limit pin, 310-oil retraction port plug and 311-oil extension port plug.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, 2 and 3, the telescopic boom of the present invention includes a telescopic cylinder 11, a primary boom cylinder 12, a secondary boom cylinder 13, a pin inserting and pulling mechanism 14, a primary boom cylinder tail mechanism 15, and a secondary boom cylinder tail mechanism 16. The pin inserting and pulling mechanism 14 is connected with the cylinder barrel of the telescopic cylinder 11 through bolts and comprises a base 21, a cylinder pin outer barrel 22, a cylinder pin 25 and an arm pin push rod 26, wherein annular cavities and sealing members are arranged between the cylinder pin outer barrel 22 and the cylinder pin 25 and between the cylinder pin 25 and the arm pin push rod 26, and therefore a two-stage telescopic cylinder is formed. One-level arm section of thick bamboo afterbody mechanism 15 and one-level arm section of thick bamboo 12 rigid connection, second grade arm section of thick bamboo afterbody mechanism 16 and second grade arm section of thick bamboo 13 rigid connection, all be equipped with the jar pinhole on one-level arm section of thick bamboo afterbody mechanism 15 and second grade arm section of thick bamboo afterbody mechanism 16, the jar pinhole of one-level arm section of thick bamboo afterbody mechanism 15 and second grade arm section of thick bamboo afterbody mechanism 16 can be connected at the horizontal direction with the jar round pin 25 of plug pin mechanism 14 respectively, realize plug pin mechanism 14 and the connection of one-level arm section of thick bamboo 12 and second grade arm section. Arm pin levers 23, arm pins 24 and reset springs are arranged on the first-stage arm cylinder tail mechanism 15 and the second-stage arm cylinder tail mechanism 16, arm pin holes are formed in the first-stage arm cylinder 12 and the second-stage arm cylinder 13, the arm pins 24 can be pulled out of the arm pin holes or inserted into the arm pin holes under the action of the reset springs under the action of the arm pin levers 23, and therefore the arm pins 24 can be disconnected or connected with the first-stage arm cylinder 12 and the second-stage arm cylinder 13.

The piston rod of the telescopic oil cylinder 11 is connected with the bottom of the telescopic arm, when the telescopic oil cylinder 11 acts, the piston rod of the telescopic oil cylinder 11 does not move, the cylinder barrel of the telescopic oil cylinder 11 acts up and down, and therefore the pin inserting and pulling mechanism 14 connected with the cylinder barrel of the telescopic oil cylinder 11 through the bolt acts up and down along with the cylinder barrel of the telescopic oil cylinder 11.

The primary arm cylinder tail mechanism 15 is rigidly connected with the primary arm cylinder 12, and meanwhile, a cylinder pin hole in the primary arm cylinder tail mechanism 15 is connected with a cylinder pin 25 of the plug pin mechanism 14 in the horizontal direction, so that the plug pin mechanism 14 can be connected with the primary arm cylinder 12, and further, a cylinder barrel of the telescopic oil cylinder 11 is connected with the primary arm cylinder 12, and the primary arm cylinder 12 moves up and down along with the cylinder barrel of the telescopic oil cylinder 11. The structure and the working principle of the secondary arm cylinder tail mechanism 16 and the primary arm cylinder tail mechanism 15 are the same, and the secondary arm cylinder 13 can move up and down along with the cylinder barrel of the telescopic cylinder 11, which is not described in detail herein.

In the pin inserting and pulling mechanism 14, a base 21 is connected with a cylinder barrel of the telescopic cylinder 11 through a bolt, and annular cavities and sealing members are arranged between a cylinder pin outer barrel 22 and a cylinder pin 25 and between the cylinder pin 25 and an arm pin push rod 26, so that a two-stage telescopic cylinder is formed. The base 21 is provided with a retracting oil port plug 310 and an extending oil port plug 311, the retracting oil port plug 310 and the extending oil port plug 311 can be detached during normal operation to be respectively connected with a retracting oil path and an extending oil path of a hydraulic system, after the extending oil port plug 311 is detached to enable the extending oil path to be communicated with oil, the cylinder pin 25 and the arm pin push rod 26 are extended, and after the retracting oil port plug 310 is detached to enable the retracting oil path to be communicated with oil, the cylinder pin 25 and the arm pin push rod 26 are retracted.

In the telescopic boom of the present invention, when the base 21 moves with the telescopic cylinder 11 to a position such that the cylinder pin 25 is positioned corresponding to the cylinder pin hole of the primary boom cylinder 12, the telescopic cylinder 11 is stopped, and then the oil is extended out of the oil passage to extend the cylinder pin 25 to be inserted into the cylinder pin hole of the primary boom cylinder 12, thereby connecting the primary boom cylinder 12 with the telescopic cylinder 11. The arm pin 24 is inserted into the arm pin hole of the secondary arm cylinder 13 without extending the arm pin push rod 26, and the primary arm cylinder 12 and the secondary arm cylinder 13 can move up and down with the telescopic cylinder 11. When the arm pin push rod 26 is extended, the arm pin push rod 26 pushes the arm pin lever 23 and further drives the arm pin 24 to be pulled out from the arm pin hole of the secondary arm cylinder 13, and only the primary arm cylinder 12 can move up and down along with the telescopic cylinder 11 at the moment without driving the secondary arm cylinder 13. When the telescopic arm is not required to operate, the arm pin push rod 26 is retracted, the arm pin 24 is inserted into the arm pin hole of the secondary arm cylinder 13 by the spring force of the return spring, and then the cylinder pin 25 is retracted, thereby disconnecting the primary arm cylinder 12 from the telescopic cylinder 11.

In the arm pin pulling operation, the cylinder pin 25 is firstly extended, and the arm pin push rod 26 can be extended to pull the arm pin 24 after the cylinder pin 25 is positioned; in the arm pin inserting operation, the arm pin push rod 26 must be retracted to insert the arm pin into the arm pin hole before the cylinder pin 25 can be retracted.

The arm pin push rod 26 is provided with a shoulder, the arm pin push rod 26 is divided into a large-diameter section and a small-diameter section by the shoulder, a through hole is formed in the position, corresponding to the shoulder, of the cylinder pin 25, a first limiting ball 33 is placed in the through hole, a cylinder pin outer cylinder limiting groove 36 is formed in the cylinder pin outer cylinder 22, the position of the cylinder pin outer cylinder limiting groove 36 corresponds to the position of the through hole formed in the cylinder pin 25 after the cylinder pin extends out of the position, and a cylinder pin limiting groove 37 is further formed in the cylinder pin 25. The lower part of the base 21 of the pin inserting and pulling mechanism 14 is provided with a spring-loaded cylinder pin limiting pin 39, the arm pin 24 is further provided with a lower feeler lever, when the cylinder pin 25 is positioned at a position corresponding to a cylinder pin hole of the primary arm cylinder 12, the lower feeler lever is over against the cylinder pin limiting pin 39, the cylinder pin limiting pin 39 is also provided with a shoulder, the cylinder pin limiting pin 39 is divided into a large-diameter section and a small-diameter section by the shoulder, the positions of the base 21 and the cylinder pin outer cylinder 22 corresponding to the shoulder are provided with through holes, and second limiting balls 38 are placed in the through holes.

When the cylinder pin 25 and the arm pin push rod 26 are fully retracted, the first limit ball 33 is clamped at the shoulder of the arm pin push rod 26, the arm pin push rod 26 cannot slide in the cylinder pin 25, only the cylinder pin 25 can be extended at the moment, and the arm pin push rod 26 cannot be extended, so that the arm pin 24 cannot be pushed to operate. When the cylinder pin 25 extends to the right position, the first limit ball 33 enters the cylinder pin outer cylinder limiting groove 36 of the cylinder pin outer cylinder 22 under the action of the shoulder of the arm pin push rod 26, the first limit ball 33 cannot limit the movement of the arm pin push rod 26 at the moment, the arm pin push rod 26 extends out to pull out the arm pin 24 when the extending action is continuously performed at the moment, the lower contact rod of the arm pin 24 pushes the cylinder pin limiting pin 39, and the shoulder on the cylinder pin limiting pin 39 enables the second limit ball 38 to move to be clamped in the cylinder pin positioning groove 37. At this time, the second limiting ball 38 enters the cylinder pin positioning groove 37, so the cylinder pin 25 cannot act, when doing retraction action, due to the action of the large diameter section of the arm pin push rod 26 and the action of the large diameter section of the cylinder pin limiting pin 39, the first limiting ball 33 can only be in the cylinder pin outer cylinder limiting groove 36, the second limiting ball 38 can only be in the cylinder pin limiting groove 37, so as to limit the cylinder pin 25 from acting, at this time, the arm pin push rod 26 can only be retracted first, the arm pin 24 is inserted, the lower contact rod of the arm pin 24 retracts, the cylinder pin limiting pin 39 pops out under the action of the spring, the second limiting ball 38 falls, and the cylinder pin limiting groove 37 can not limit the cylinder pin 25 any more. When the arm pin push rod 26 is completely retracted, the first limiting ball 33 acts on the small-diameter section of the arm pin push rod 26, the cylinder pin outer cylinder limiting groove 36 does not limit the cylinder pin 25 through the first limiting ball 33 any more, and when the retracting action is continued, the cylinder pin 25 retracts, and at the moment, the arm pin push rod 26 cannot act and returns to the initial position because the first limiting ball 33 is located in the shoulder limit of the arm pin push rod 26.

If a failure occurs during operation in which the arm pin 24 cannot be inserted into the arm pin hole under the action of the spring, the arm pin push rod 26 is already retracted, and the first limit ball 33 cannot play a role of limiting the movement of the cylinder pin 25, at this time, since the arm pin 24 is in a pulled-out state, the lower feeler lever thereof always acts on the cylinder pin limit pin 39, and the second limit ball 38 acts on the cylinder pin limit groove 37, so that the cylinder pin 25 is also prevented from moving, thereby achieving interlocking of the cylinder pin and the arm pin.

The telescopic boom realizes the interlocking of the cylinder pin and the boom pin, and the cylinder pin and the boom pin push rod have smaller size, can be arranged in the same plane of the telescopic oil cylinder, occupy smaller space, thus greatly improving the basic length and the full elongation of the telescopic boom and simultaneously improving the safety and the stability of the vertical telescopic boom crane.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like are referred to herein as being placed in the state shown in the drawings.

It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.