Telescopic arm locking device and working machine

Abstract

The invention discloses a telescopic arm locking device and an operating machine, the telescopic arm locking device comprises an arm pin and a plugging mechanism, the arm pin is telescopically arranged on an inner arm section of a telescopic arm and used for locking an outer arm section, and a mounting hole is formed in the arm pin; the inserting and pulling mechanism comprises a limiting ball, an inserting and pulling rod and a telescopic driving assembly, the limiting ball is arranged in the mounting hole, the inserting and pulling rod telescopically penetrates through the arm pin and is provided with a containing groove, the telescopic driving assembly is used for driving the inserting and pulling rod to stretch out and draw back, and the limiting ball falls into the containing groove under the condition that the containing groove communicates with the mounting hole, so that the inserting and pulling rod can drive the arm pin to stretch out and draw back; the limiting ball abuts against the inserting and pulling rod under the condition that the containing groove and the mounting hole are staggered so that the limiting ball can stretch out of the mounting hole and limit stretching and retracting of the arm pin. According to the telescopic arm locking device, the containing groove is formed in the inserting and pulling rod, and the limiting ball is arranged in the mounting hole of the arm pin, so that the phenomenon that the arm pin stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out and drastically stretches out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of working machines, and particularly relates to a telescopic arm locking device and a working machine. BACKGROUND

[0002] The telescopic arm is usually composed of an outermost basic arm and a plurality of arm segments telescopically sleeved inside the basic arm. At present, the locking between the arm segments is usually achieved by means of an arm pin passing through two adjacent arm segments. However, the existing locking device only drives the telescopic arm pin to lock or unlock two adjacent arm segments. If the arm pin rubs against or collides with the arm segment during plugging, the telescopic arm pin will be stuck, the arm pin will not be telescoped in place, and the arm segment will be locked unstably, misaligned, unable to be telescopically extended, and the like, and even cause the arm to fall, the arm pin to break, and the like, resulting in poor locking stability and low reliability. SUMMARY

[0003] In view of the above defects or deficiencies, the present application provides a telescopic arm locking device and a working machine, aiming to solve the technical problem of poor locking stability and low reliability of the existing telescopic arm locking device.

[0004] In order to achieve the above-mentioned purpose, the present application provides a telescopic arm locking device, which comprises: An arm pin is telescopically arranged on an inner arm segment of the telescopic arm and used for locking an outer arm segment of the telescopic arm, and an installation hole is formed in the arm pin. A plugging mechanism comprises a limiting ball, a plugging rod and a telescopic driving assembly. The limiting ball is arranged in the installation hole. The plugging rod is telescopically arranged through the arm pin and is provided with a containing groove. The telescopic driving assembly is used for driving the plugging rod to telescope. The limiting ball falls into the containing groove when the containing groove and the installation hole are in alignment, so that the plugging rod can drive the arm pin to telescope through the limiting ball. The limiting ball abuts against the plugging rod when the containing groove and the installation hole are misaligned, so that the limiting ball is arranged outside the installation hole and limits the telescoping of the arm pin.

[0005] In the embodiment of the present application, an installation cavity is formed in the arm pin for the plugging rod to pass through. The installation hole and the installation cavity are in communication. An installation groove is formed in the cavity wall of the installation cavity. The plugging mechanism further comprises a reset driving assembly arranged in the installation groove. The reset driving assembly is used for driving the plugging rod to reset and abut against the limiting ball.

[0006] In the embodiment of the present application, the plugging rod is provided with a containing groove group. The containing groove group comprises two containing grooves arranged at intervals along the length direction of the plugging rod. The two containing grooves are respectively a first containing groove and a second containing groove, and a limiting abutting table is formed between the first containing groove and the second containing groove. The first containing groove and the second containing groove are respectively used for the limiting ball to fall into. The reset driving assembly is used for driving the plugging rod to reset so that the limiting abutting table abuts against the limiting ball.

[0007] In the embodiment of the present application, the reset driving assembly comprises a first spring and a second spring, both of which are sleeved on the plug-in rod, the mounting groove has oppositely arranged first and second push walls, the plug-in rod is provided with a push boss, the two ends of the first spring are in one-to-one correspondence with the first push wall and the push boss and abut against them respectively, and the two ends of the second spring are in one-to-one correspondence with the second push wall and the push boss and abut against them respectively.

[0008] In the embodiment of the present application, the telescopic arm locking device further comprises a detection assembly, which comprises a piezoelectric sensor arranged in the accommodating groove and used for detecting position information of the limiting ball.

[0009] In the embodiment of the present application, the telescopic driving assembly comprises a telescopic driving member and a lifting seat, the telescopic driving member is arranged in the inner arm segment and used for driving the lifting seat to lift, the lifting seat is provided with an adapter groove, the plug-in rod is provided with an adapter block connected in the adapter groove.

[0010] In the embodiment of the present application, the detection assembly further comprises an electric connection wire and a current sensor, the electric connection wire is arranged through the plug-in rod, one end of the electric connection wire is electrically connected with the piezoelectric sensor, the other end of the electric connection wire is provided as a current transmission end, and the current sensor is arranged in the adapter groove and used for detecting a current signal of the current transmission end.

[0011] In the embodiment of the present application, the telescopic driving member is a telescopic oil cylinder, the detection assembly further comprises a pressure sensor and a controller, the pressure sensor is used for detecting the pressure of the telescopic oil cylinder, the controller is in communication connection with the pressure sensor and is configured to determine the working state of the reset driving assembly according to the pressure of the telescopic oil cylinder and control the running state of the telescopic oil cylinder according to the working state of the reset driving assembly.

[0012] In the embodiment of the present application, the telescopic arm locking device further comprises a limiting baffle, the limiting baffle is arranged on the inner arm segment and provided with a through hole through which the arm pin passes, and the limiting baffle abuts against the limiting ball when the accommodating groove is misaligned with the mounting hole.

[0013] In order to achieve the above-mentioned purpose, the present application further provides a working machine, which comprises a telescopic arm support system, and the telescopic arm support system comprises the telescopic arm locking device according to the above.

[0014] Through the above technical scheme, the telescopic arm locking device and the working machine provided by the embodiment of the present application have the following beneficial effects: In the technical scheme of the present application, the telescopic arm locking device is provided with the accommodating groove on the plug rod and the limiting ball arranged in the mounting hole of the arm pin, so that in the process of locking or unlocking the outer arm section by the arm pin, the limiting ball falls into the accommodating groove to connect the arm pin and the plug rod, the plug rod can drive the arm pin to extend or retract to lock or unlock the outer arm section, the limiting ball is arranged in the mounting hole to reduce friction, the extension and retraction of the arm pin is smooth, and the extension and retraction of the arm pin is prevented from being stuck; and when the arm pin is extended or retracted to lock or unlock the outer arm section, the limiting ball extends out of the mounting hole to limit the extension and retraction of the arm pin, so as to limit the arm pin at the position of locking or unlocking the outer arm section, the extension and retraction of the arm pin is prevented from being unstable, misaligned and unable to extend or retract, and the stability and reliability of the extension and retraction of the arm pin are greatly improved.

[0015] Other features and advantages of the present application will be illustrated in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and serve to explain the principles of the present application, but are not intended to limit the present application. Other drawings can be obtained by those of ordinary skill in the art without creative effort based on the structures shown in the drawings. In the drawings: Figure 1 is a structural schematic view of the arm pin locking the outer arm section in the telescopic arm locking device according to an embodiment of the present application; Figure 2 is a structural schematic view of the arm pin retracted in the telescopic arm locking device according to an embodiment of the present application; Figure 3 is a structural schematic view of the arm pin unlocking the outer arm section in the telescopic arm locking device according to an embodiment of the present application; Figure 4 is a structural schematic view of the arm pin extended in the telescopic arm locking device according to an embodiment of the present application; Figure 5 is a structural schematic view of the telescopic arm locking device according to an embodiment of the present application; Figure 6 is a structural schematic view of the arm pin and the plug rod in the telescopic arm locking device according to an embodiment of the present application; Figure 7 is a structural schematic view of the telescopic driving assembly in the telescopic arm locking device according to an embodiment of the present application; Figure 8 is a structural block diagram of the detection assembly in the telescopic arm locking device according to an embodiment of the present application.

[0017] Explanation of reference signs Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] The telescopic arm locking device of the present invention will now be described with reference to the accompanying drawings.

[0020] like Figures 1 to 4 As shown, the present invention provides a telescopic arm locking device, which includes an arm pin 10 and a plug-in mechanism. The arm pin 10 is telescopically disposed on the inner arm section 201 of the telescopic arm 200 and is used to lock the outer arm section 202 of the telescopic arm 200. The arm pin 10 has a mounting hole 11. The plug-in mechanism includes a limiting ball 20, a plug-in rod 30 and a telescopic drive assembly 40. The limiting ball 20 is disposed in the mounting hole 11. The plug-in rod 30 is telescopically disposed through the arm pin 10 and has a receiving groove 31. The telescopic drive assembly 40 is used to drive the plug-in rod 30 to extend and retract. When the receiving groove 31 is aligned with the mounting hole 11, the limiting ball 20 falls into the receiving groove 31 so that the plug-in rod 30 can drive the arm pin 10 to extend and retract through the limiting ball 20. When the receiving groove 31 is misaligned with the mounting hole 11, the limiting ball 20 abuts against the plug-in rod 30 so that the limiting ball 20 extends out of the mounting hole 11 and restricts the extension and retraction of the arm pin 10.

[0021] It should be noted that the telescopic boom locking device is used to lock the telescopic boom 200. The telescopic boom 200 includes an outer boom section 202 and an inner boom section 201. The inner boom section 201 is located inside the outer boom section 202 and can extend and retract relative to the outer boom section 202. The outer boom section 202 can be a base boom or a boom section located inside the base boom. The inner boom section 201 is a boom section adjacent to the outer boom section 202. That is, any two boom sections that are adjacent from the outside to the inside can be respectively set as the outer boom section 202 located on the outside and the inner boom section 201 located on the inside. The telescopic boom locking device of the present invention is used to lock or unlock the outer boom section 202 and the inner boom section 201 that are adjacent from the outside to the inside. The embodiments of the present invention do not limit the number of boom sections of the telescopic boom 200.

[0022] Specifically, the arm pin 10 is arranged through the inner arm segment 201 and can be telescoped relative to the inner arm segment 201, the plug-in rod 30 is arranged in the arm pin 10, the accommodating groove 31 is formed in the plug-in rod 30, the mounting hole 11 is formed in the arm pin 10, the limiting ball 20 is arranged in the mounting hole 11, and the telescopic driving assembly 40 is arranged in the inner arm segment 201 and is drivingly connected with the plug-in rod 30; when it is required to lock or unlock the outer arm segment 202, the telescopic driving assembly 40 drives the plug-in rod 30 to telescope, so that the accommodating groove 31 on the plug-in rod 30 is telescoped to a position in communication with the mounting hole 11, the limiting ball 20 can be extended into the accommodating groove 31 in the case that the accommodating groove 31 and the mounting hole 11 are in communication, and the side of the limiting ball 20 away from the accommodating groove 31 is retracted into the mounting hole 11, the plug-in rod 30 can drive the limiting ball 20 to telescope, so that the limiting ball 20 drives the arm pin 10 to extend and then pass through the outer arm segment 202 to lock the outer arm segment 202 relative to the inner arm segment 201, or drives the arm pin 10 to retract to unlock the outer arm segment 202; in the case that the arm pin 10 locks or unlocks the outer arm segment 202, the plug-in rod 30 is telescoped in the arm pin 10 to make the accommodating groove 31 be arranged in a position dislocated relative to the mounting hole 11, the plug-in rod 30 abuts against the limiting ball 20 to make the rod wall of the plug-in rod 30 push and extrude the limiting ball 20 out of the mounting hole 11, the side of the limiting ball 20 away from the plug-in rod 30 is extended out of the mounting hole 11 to limit the telescopic movement of the arm pin 10, and then the arm pin 10 is limited at the position of locking or unlocking the outer arm segment 202.

[0023] In the embodiment of the present application, the telescopic arm locking device is arranged by forming the accommodating groove 31 on the plug-in rod 30 and arranging the limiting ball 20 in the mounting hole 11 of the arm pin 10, so that in the process that the arm pin 10 locks or unlocks the outer arm segment 202, the limiting ball 20 falls into the accommodating groove 31 to connect the arm pin 10 and the plug-in rod 30, the plug-in rod 30 can drive the arm pin 10 to telescope through the limiting ball 20 to lock or unlock the outer arm segment 202, and the limiting ball 20 is arranged in the mounting hole 11 to roll to reduce friction, improve the telescopic smoothness of the arm pin 10, and effectively prevent the telescopic jam of the arm pin 10; and in the case that the arm pin 10 is telescoped to lock or unlock the outer arm segment 202, the limiting ball 20 is extended out of the mounting hole 11 to limit the telescopic movement of the arm pin 10, and then the arm pin 10 is limited at the position of locking or unlocking the outer arm segment 202, which effectively prevents the telescopic arm 200 from being locked unstably, dislocated and unable to telescope due to the telescopic failure of the arm pin 10, and greatly improves the stability and reliability of the telescopic arm 200 in locking or unlocking.

[0024] In the embodiment of the present application, the arm pin 10 is provided with a mounting cavity 12 through which the plug rod 30 passes, the mounting hole 11 is communicated with the mounting cavity 12, the cavity wall of the mounting cavity 12 is provided with a mounting groove 13, and the plug mechanism further comprises a reset driving assembly 50 which is arranged in the mounting groove 13 and is used to drive the plug rod 30 to reset and abut against the limiting ball 20.

[0025] As shown in Figures 1 to 4 and Figure 6 , the arm pin 10 is hollow and has a mounting cavity 12, the plug rod 30 is telescopically arranged in the mounting cavity 12, the arm pin 10 is provided with a mounting hole 11 for mounting the limiting ball 20, the mounting hole 11 is communicated with the mounting cavity 12 so that the limiting ball 20 can extend into the accommodating groove 31 on the plug rod 30 from the mounting hole 11, thereby releasing the telescopic restriction of the arm pin 10, and the cavity wall of the mounting cavity 12 is provided with a mounting groove 13, the mounting groove 13 is provided with a reset driving assembly 50, the reset driving assembly 50 is used to drive the plug rod 30 to reset, and the accommodating groove 31 is arranged in a staggered manner relative to the mounting hole 11 when the plug rod 30 is telescoped to the reset position, so that the plug rod 30 abuts against the limiting ball 20 and pushes and extrudes the limiting ball 20 out of the mounting hole 11, so that the limiting ball 20 abuts against the outer side or the inner side of the inner arm segment 201 to restrict the telescoping of the arm pin 10, and the arm pin 10 is stably positioned at the position of the locked outer arm segment 202 or the unlocked outer arm segment 202, thereby improving the locking stability and reliability. The telescopic arm locking device cooperates with the limiting ball 20 and the accommodating groove 31 to improve the telescopic smoothness of the arm pin 10, prevent the telescopic jamming of the arm pin 10, and automatically reset the plug rod 30 by arranging the reset driving assembly 50, thereby limiting the arm pin 10 by the limiting ball 20, preventing the arm pin 10 from not being telescoped in place, and improving the stability, safety and reliability of locking or unlocking.

[0026] In the embodiment of the present application, the plug rod 30 is provided with an accommodating groove group, the accommodating groove group comprises two accommodating grooves 31 which are arranged in a spaced manner along the length direction of the plug rod 30, the two accommodating grooves 31 are respectively a first accommodating groove 31a and a second accommodating groove 31b, and a limiting abutting table 32 is formed between the first accommodating groove 31a and the second accommodating groove 31b, the first accommodating groove 31a and the second accommodating groove 31b are respectively used for the limiting ball 20 to fall into, and the reset driving assembly 50 is used to drive the plug rod 30 to reset so that the limiting abutting table 32 abuts against the limiting ball 20.

[0027] As shown in Figure 1 , the arm pin 10 is located at the position of the locked outer arm segment 202, the limiting abutting table 32 on the plug rod 30 abuts against the limiting ball 20 so that the limiting ball 20 extends out of the mounting hole 11, the limiting ball 20 is located between the inner arm segment 201 and the outer arm segment 202 to restrict the telescoping of the arm pin 10 and thereby limit the arm pin 10 at the position of the locked outer arm segment 202, and the locking is stable and reliable; asFigure 2 As shown, when the outer arm section 202 needs to be unlocked, the telescopic driving assembly 40 drives the plug-in rod 30 to retract, so that the first accommodating groove 31a is aligned with the mounting hole 11, the limiting ball 20 falls into the first accommodating groove 31a to release the telescopic restriction on the arm pin 10, and the side of the limiting ball 20 away from the first accommodating groove 31a is in rolling fit with the inner arm section 201 to reduce friction and improve the telescopic smoothness of the arm pin 10, effectively preventing telescopic jamming of the arm pin 10. Figure 3 As shown, when the arm pin 10 is retracted to the position to unlock the outer arm section 202, the reset driving assembly 50 drives the plug-in rod 30 to reset, so that the limiting abutting table 32 corresponds to the mounting hole 11 and abuts against the limiting ball 20, the limiting ball 20 extends out of the mounting hole 11 and abuts against the inner side of the inner arm section 201 to limit the extension of the arm pin 10, and the arm pin 10 is limited at the position to unlock the outer arm section 202, which is stable and reliable. Figure 4 As shown, when the outer arm section 202 needs to be locked, the telescopic driving assembly 40 drives the plug-in rod 30 to extend, so that the second accommodating groove 31b is aligned with the mounting hole 11, the limiting ball 20 falls into the second accommodating groove 31b to release the telescopic restriction on the arm pin 10, and the side of the limiting ball 20 away from the second accommodating groove 31b is in rolling fit with the inner arm section 201 to reduce friction and improve the telescopic smoothness of the arm pin 10, effectively preventing telescopic jamming of the arm pin 10. Figure 1 As shown, when the arm pin 10 is extended to the position to lock the outer arm section 202, the reset driving assembly 50 drives the plug-in rod 30 to reset, so that the limiting abutting table 32 corresponds to the mounting hole 11 and abuts against the limiting ball 20, the limiting ball 20 extends out of the mounting hole 11 and abuts against the outer side of the inner arm section 201 to limit the telescopic movement of the arm pin 10, and the arm pin 10 is limited at the position to lock the outer arm section 202, the telescopic arm locking device realizes the retraction and extension of the arm pin 10 and limits the telescopic movement of the arm pin 10 through the first accommodating groove 31a, the second accommodating groove 31b and the limiting abutting table 32 respectively cooperating with the limiting ball 20, improves the telescopic smoothness of the arm pin 10, and improves the locking stability and reliability.

[0028] In the embodiment of the present application, as shown in Figures 1 to 4 and Figure 6 The number of accommodating groove groups is set to be multiple, the multiple accommodating groove groups are arranged along the outer periphery of the plug-in rod 30 in a ring shape, each accommodating groove group includes the first accommodating groove 31a and the second accommodating groove 31b arranged below the first accommodating groove 31a, and the number of limiting balls 20 is consistent with and one-to-one corresponds to the number of accommodating groove groups, and the multiple limiting balls 20 can all play the role of guiding the telescopic movement of the arm pin 10 and limiting the telescopic movement of the arm pin 10, further improving the telescopic smoothness and limiting stability of the arm pin 10.

[0029] In the embodiment of the present application, the reset driving assembly 50 comprises a first spring 51 and a second spring 52, both of which are sleeved on the plug-in rod 30, the mounting groove 13 has oppositely arranged first and second push walls 131 and 132, the plug-in rod 30 is provided with a push boss 33, the two ends of the first spring 51 are respectively in one-to-one correspondence with the first push wall 131 and the push boss 33 and abut against them, and the two ends of the second spring 52 are respectively in one-to-one correspondence with the second push wall 132 and the push boss 33 and abut against them.

[0030] As shown in Figure 6 , the lower side of the mounting groove 13 has the first push wall 131, the upper side of the mounting groove 13 has the second push wall 132, the outer periphery of the plug-in rod 30 is provided with the push boss 33, the first spring 51 is sleeved on the plug-in rod 30 and located at the lower side of the push boss 33, the end of the first spring 51 away from the push boss 33 abuts against the first push wall 131, the second spring 52 is sleeved on the plug-in rod 30 and located at the upper side of the push boss 33, and the end of the second spring 52 away from the push boss 33 abuts against the second push wall 132; as shown in Figure 2 , when it is needed to unlock the outer arm link 202, the limiting ball 20 falls into the first accommodating groove 31a, the plug-in rod 30 drives the arm pin 10 to retract, and the push boss 33 extrudes the first spring 51 in cooperation with the first push wall 131; Figure 3 , as shown in Figure 4 , when it is needed to lock the outer arm link 202, the limiting ball 20 falls into the second accommodating groove 31b, the plug-in rod 30 drives the arm pin 10 to extend, and the push boss 33 extrudes the second spring 52 in cooperation with the second push wall 132; Figure 1 , as shown in , when the arm pin 10 extends to the position to lock the outer arm link 202, the elastic restoring force of the second spring 52 acts on the push boss 33 to push the plug-in rod 30 to retract and reset, so that the limiting abutting table 32 abuts against the limiting ball 20 to reliably limit the extension and retraction of the arm pin 10, the extension and retraction arm locking device extrudes the first spring 51 in cooperation with the first push wall 131 to drive the plug-in rod 30 to reset, and extrudes the second spring 52 in cooperation with the second push wall 132 to drive the plug-in rod 30 to reset, the plug-in rod 30 resets stably and smoothly, the reliability of the limiting ball 20 in limiting the extension and retraction of the arm pin 10 is improved, the movement of the arm pin 10 at the locking position or the unlocking position is effectively prevented, and the stability is further improved.

[0031] Those skilled in the art can understand that the reset driving assembly 50 of the present application is not limited to the structure including the first spring 51 and the second spring 52 as described above, and can also be a gas spring, an elastic bushing or other elastic member, or a cylinder or an electric cylinder in driving connection with the plug rod 30, as long as the structure can realize the driving reset of the plug rod 30, which shall also belong to the protection scope of the present application.

[0032] In the embodiment of the present application, the telescopic arm locking device further comprises a detection assembly 60, and the detection assembly 60 comprises a piezoelectric sensor 61 arranged in the accommodating groove 31 and used for detecting the position information of the limiting ball 20. Figures 1 to 4 and Figure 6 As shown in the drawings, the piezoelectric sensor 61 can be a piezoelectric element such as a piezoelectric ceramic or a piezoelectric film that generates an electric charge (positive piezoelectric effect) when subjected to mechanical stress. The piezoelectric sensor 61 is arranged in the accommodating groove 31, and the limiting ball 20 extrudes the piezoelectric sensor 61 when falling into the accommodating groove 31, so that the piezoelectric sensor 61 generates an electric current under stress to determine that the limiting ball 20 extends into the accommodating groove 31, thereby realizing the detection of the position information of the limiting ball 20. The telescopic arm locking device can determine that the limiting ball 20 falls into the accommodating groove 31 according to the position information of the limiting ball 20, so as to determine that the limiting ball 20 releases the telescopic restriction on the arm pin 10 and the telescopic movement of the arm pin 10 is in a normal state, thereby further improving the stability and reliability of the locking or unlocking of the telescopic arm 200. It can be understood that when the outer arm section 202 needs to be locked or unlocked, the plug rod 30 is telescoped to the position of the accommodating groove 31 relative to the mounting hole 11. In the case that the piezoelectric sensor 61 does not generate an electric current, it can be determined that the limiting ball 20 does not fall into the accommodating groove 31, and it can be determined that the arm pin 10 is abnormally telescopic, which may result in the limiting failure of the arm pin 10 or the loosening of the limiting ball 20. Therefore, the telescopic condition of the arm pin 10 can be judged and controlled, thereby further improving the stability and reliability.

[0033] Further, the first accommodating groove 31a and the second accommodating groove 31b are each provided with a piezoelectric sensor 61. The piezoelectric sensor 61 in the first accommodating groove 31a is a first piezoelectric sensor 61a, and the piezoelectric sensor 61 in the second accommodating groove 31b is a second piezoelectric sensor 61b. The limiting ball 20 pushes the first piezoelectric sensor 61a when falling into the first accommodating groove 31a, and the first piezoelectric sensor 61a generates an electric current under the extrusion of the limiting ball 20 to determine that the limiting ball 20 extends into the first accommodating groove 31a. The arm pin 10 can be normally retracted to unlock the outer arm section 202, as shown in the drawings. Figure 2and the second piezoelectric sensor 61b generates an electric current under the extrusion of the limiting ball 20 to determine that the limiting ball 20 extends into the second accommodating groove 31b, and the arm pin 10 extends out to normally lock the outer arm section 202, as shown in Figure 4 As shown, the telescopic arm locking device determines whether the retraction action of the arm pin 10 is abnormal and whether the extension action of the arm pin 10 is abnormal by respectively arranging the first piezoelectric sensor 61a in the first accommodating groove 31a and the second piezoelectric sensor 61b in the second accommodating groove 31b, so as to accurately determine the telescopic state of the arm pin 10, and improve the stability and reliability of the telescopic arm 200 in locking or unlocking.

[0034] In the embodiment of the present application, the telescopic driving assembly 40 comprises a telescopic driving member 41 and a lifting seat 42, the telescopic driving member 41 is arranged in the inner arm section 201 and is used to drive the lifting seat 42 to lift, the lifting seat 42 is provided with an adapter groove 421, the plug-in rod 30 is provided with an adapter block 34, and the adapter block 34 is connected in the adapter groove 421, as shown in Figures 5 to 7 As shown, the telescopic driving member 41 is arranged in the inner arm section 201 and is drivingly connected with the lifting seat 42 to drive the lifting seat 42 to lift, the lifting seat 42 is provided with an adapter groove 421, the plug-in rod 30 is provided with an adapter block 34 at the end away from the accommodating groove 31, the adapter block 34 extends into the adapter groove 421 and is used to abut against the groove wall of the adapter groove 421 to connect the lifting seat 42 and the plug-in rod 30; specifically, the upper side of the adapter groove 421 is provided with a first abutting groove wall 4211, and the lower side of the adapter groove 421 is provided with a second abutting groove wall 4212, as shown in Figure 2 When it is needed to unlock the outer arm section 202, the telescopic driving member 41 drives the lifting seat 42 to descend to make the adapter block 34 abut against the first abutting groove wall 4211, so that the lifting seat 42 drives the plug-in rod 30 and the arm pin 10 to retract to unlock the outer arm section 202, and as shown in Figure 4 When it is needed to lock the outer arm section 202, the telescopic driving member 41 drives the lifting seat 42 to ascend to make the adapter block 34 abut against the second abutting groove wall 4212, so that the lifting seat 42 drives the plug-in rod 30 and the arm pin 10 to extend to lock the outer arm section 202, which realizes the telescopic driving of the arm pin 10 by arranging the lifting seat 42, and as shown in Figure 5 and Figure 7 As shown, the adapter block 34 does not interfere with the movement of the lifting seat 42 in the length direction of the inner arm section 201, so that the telescopic mechanism of the telescopic arm frame system can drive the telescopic driving assembly 40 to move to the position corresponding to any one of the inner arm sections 201 to sequentially lock or unlock a plurality of outer arm sections 202, the structure design is reasonable, and the telescopic driving of the arm pin 10 is realized.

[0035] In this embodiment of the invention, the detection component 60 further includes an electrical connection wire 62 and a current sensor 63. The electrical connection wire 62 passes through the plug-in rod 30, one end of the electrical connection wire 62 is electrically connected to the piezoelectric sensor 61, and the other end of the electrical connection wire 62 is set as a current transmission end 621. The current sensor 63 is disposed in the adapter slot 421 and is used to detect the current signal of the current transmission end 621. Figures 1 to 4 and Figure 6 As shown, the electrical connection line 62 is electrically connected to the piezoelectric sensor 61 in the receiving groove 31 and passes through the insertion rod 30 along the length direction of the insertion rod 30. A current sensor 63 is provided in the adapter groove 421. When the limiting ball 20 falls into the receiving groove 31, it pushes the piezoelectric sensor 61. The piezoelectric sensor 61 generates current when pushed. The current is transmitted along the electrical connection line 62 to the current transmission end 621. When the current sensor 63 detects the current signal at the current transmission end 621, it determines that the limiting ball 20 has fallen into the receiving groove 31, and thus determines that the extension and retraction of the arm pin 10 is normal. The current wiring and the setting of the current sensor 63 facilitate the transmission and detection of the current signal, improve the convenience of detecting the position information of the limiting ball 20, and have a reasonable structural design and convenient and quick installation.

[0036] Furthermore, two current sensors 63 are provided in the adapter slot 421. The two current sensors 63 are respectively designated as a first current sensor 63a and a second current sensor 63b. The first current sensor 63a is located on the first abutment slot wall 4211, and the second current sensor 63b is located on the second abutment slot wall 4212. One end of the electrical connection line 62 branches to be electrically connected to the first piezoelectric sensor 61a and the second piezoelectric sensor. The other end of the electrical connection line 62 branches to have two current transmission ends 621. One current transmission end 621 extends to the upper side of the adapter block 34, and the other current transmission end 621 extends to the lower side of the adapter block 34. Figure 2 As shown, when the limiting ball 20 falls into the first receiving groove 31a, it pushes the first piezoelectric sensor 61a, causing the current generated by the first piezoelectric sensor 61a to be transmitted along the electrical connection line 62 to the current transmission end 621 located on the upper side of the adapter block 34. The first current sensor 63a detects the current signal at the current transmission end 621 to determine that the arm pin 10 has retracted normally; Figure 4 As shown, when the limiting ball 20 falls into the second receiving groove 31b, it pushes the second piezoelectric sensor 61b, causing the current generated by the second piezoelectric sensor 61b to be transmitted along the electrical connection line 62 to the current transmission end 621 located on the lower side of the adapter block 34. The second current sensor 63b detects the current signal at the current transmission end 621 to determine that the arm pin 10 is normally extended. The first current sensor 63a and the second current sensor 63b respectively detect the current signals generated by the first piezoelectric sensor 61a and the second piezoelectric sensor 61b to accurately determine the extension and retraction of the arm pin 10, thereby improving the detection accuracy and reliability.

[0037] In the embodiment of the present application, the telescopic drive 41 is a telescopic oil cylinder 41a, the detection assembly 60 further comprises a pressure sensor 64 and a controller 65, the pressure sensor 64 is configured to detect the pressure of the telescopic oil cylinder 41a, and the controller 65 is in communication connection with the pressure sensor 64 and is configured to determine the working state of the reset drive assembly 50 according to the pressure of the telescopic oil cylinder 41a, and control the running state of the telescopic oil cylinder 41a according to the working state of the reset drive assembly 50.

[0038] As shown in Figures 5 to 8 , the telescopic drive 41 is a telescopic oil cylinder 41a, the pressure sensor 64 can detect the pressure of the telescopic oil cylinder 41a, the telescopic oil cylinder 41a drives the lifting seat 42 to lift to drive the plug-in rod 30 to telescope, and the plug-in rod 30 overcomes the reset driving force of the reset drive assembly 50 in the telescopic process, that is, the pressure of the telescopic oil cylinder 41a is proportional to the reset driving force of the reset drive assembly 50 on the plug-in rod 30, the pressure sensor 64 transmits the detected pressure of the telescopic oil cylinder 41a to the controller 65, and the controller 65 determines the working state of the reset drive assembly 50 according to the pressure of the telescopic oil cylinder 41a, wherein the working state of the reset drive assembly 50 includes normal state and abnormal state, the reset drive assembly 50 is in normal state when the pressure of the telescopic oil cylinder 41a is proportional to the reset driving force of the reset drive assembly 50 or the pressure of the telescopic oil cylinder 41a is in the preset pressure range, and then the telescopic oil cylinder 41a can be controlled to drive the lifting seat 42 to lift to realize locking or unlocking the outer arm section 202, and the reset drive assembly 50 is in abnormal state when the pressure of the telescopic oil cylinder 41a is out of the preset pressure range, and then the telescopic oil cylinder 41a can be controlled to stop running to protect the telescopic arm locking device, further improving the stability and reliability.

[0039] Further, as shown in Figures 1 to 4As shown, the reset driving assembly 50 is provided with the first spring 51 and the second spring 52, the plug-in rod 30 needs to overcome the elastic restoring force of the first spring 51 when the arm pin 10 is retracted, the pressure of the telescopic oil cylinder 41a is proportional to the elastic restoring force of the first spring 51, the controller 65 can determine the working state of the first spring 51 according to the pressure of the telescopic oil cylinder 41a, it can be determined that the first spring 51 is in a normal state when the pressure of the telescopic oil cylinder 41a is within a preset pressure range, and then the telescopic oil cylinder 41a is controlled to drive the lifting seat 42 to descend to unlock the outer arm section 202, it can be determined that the first spring 51 is stuck or broken when the pressure of the telescopic oil cylinder 41a is outside the preset pressure range, and the controller 65 immediately controls the telescopic oil cylinder 41a to stop running to reliably protect the telescopic arm 200 and the telescopic arm locking device; it can be understood that the plug-in rod 30 needs to overcome the elastic restoring force of the second spring 52 when the arm pin 10 is extended, the pressure of the telescopic oil cylinder 41a is proportional to the elastic restoring force of the second spring 52, the controller 65 can determine the working state of the second spring 52 according to the pressure of the telescopic oil cylinder 41a, it can be determined that the second spring 52 is in a normal state when the pressure of the telescopic oil cylinder 41a is within a preset pressure range, and then the telescopic oil cylinder 41a is controlled to drive the lifting seat 42 to ascend to lock the outer arm section 202, it can be determined that the second spring 52 is stuck or broken when the pressure of the telescopic oil cylinder 41a is outside the preset pressure range, and the controller 65 immediately controls the telescopic oil cylinder 41a to stop running to reliably protect the telescopic arm 200 and the telescopic arm locking device.

[0040] In an embodiment of the present application, the preset pressure range can be set to 2000N~3000N, the first spring 51 or the second spring 52 can be determined to be in a normal state when the pressure of the telescopic oil cylinder 41a is within the preset pressure range, and then it can be determined that the arm pin 10 is normally extended and retracted, and the first spring 51 or the second spring 52 can be determined to be in an abnormal state when the pressure of the telescopic oil cylinder 41a is outside the preset pressure range, and then the telescopic oil cylinder 41a is controlled to stop running to protect the telescopic arm 200 and the telescopic arm locking device. It can be understood by those skilled in the art that in other embodiments of the present application, the preset pressure range is not limited to the above-mentioned 2000N~3000N, the preset pressure range can be flexibly set according to the load carrying capacity of the telescopic arm 200 and the lifting capacity of the work machine to which the telescopic arm 200 belongs, and the preset pressure range is set to 2000N~3000N only as an example, and the specific value of the preset pressure range is not limited in the telescopic arm locking device of the present application.

[0041] Further, it can be understood by those skilled in the art that the telescopic driving part 41 of the present application is not limited to the structure of the telescopic oil cylinder 41a as described above, the telescopic driving part 41 can also be a gas cylinder, an electric cylinder, etc., or be provided as an electric motor, and the detection assembly 60 further includes a torque sensor for detecting the torque of the electric motor, etc.

[0042] In the embodiments of the present application, as shown in Figure 8 The controller 65 is in communication connection with the first current sensor 63a, the second current sensor 63b and the pressure sensor 64 respectively, and the controller 65 is further configured to: determine the retraction state of the arm pin 10 according to the current signal detected by the first current sensor 63a, and control the operating state of the telescopic oil cylinder 41a according to the retraction state of the arm pin 10; determine the extension state of the arm pin 10 according to the current signal detected by the second current sensor 63b, and control the operating state of the telescopic oil cylinder 41a according to the extension state of the arm pin 10; determine the working state of the first spring 51 or the second spring 52 according to the pressure of the telescopic oil cylinder 41a, and control the operating state of the telescopic oil cylinder 41a according to the working state of the first spring 51 or the second spring 52.

[0043] Specifically, when it is necessary to unlock the outer arm section 202, the limiting ball 20 falls into the first accommodating groove 31a to push the first piezoelectric sensor 61a, and the current generated by the first piezoelectric sensor 61a is transmitted to the current transmission end 621 through the electric connection line 62. The first current sensor 63a detects the current signal of the current transmission end 621 to determine that the limiting ball 20 falls into the first accommodating groove 31a, and the first current sensor 63a transmits the detection result to the controller 65. The controller 65 determines that the arm pin 10 normally retracts to control the telescopic oil cylinder 41a to drive the lifting seat 42 to descend to unlock the outer arm section 202 when it is determined that the first current sensor 63a detects the current signal, and determines that the arm pin 10 retracts abnormally to control the telescopic oil cylinder 41a to stop operating when it is determined that the first current sensor 63a does not detect the current signal, thereby realizing reliable protection of the telescopic arm 200 and the telescopic arm locking device. In addition, the pressure sensor 64 detects the pressure of the telescopic oil cylinder 41a during the retraction process and sends the detection result to the controller 65, and the controller 65 judges the first spring 51 to be in a normal state or an abnormal state according to the pressure of the telescopic oil cylinder 41a, so as to realize that the arm pin 10 unlocks the outer arm section 202 when the first spring 51 is in the normal state, and control the telescopic oil cylinder 41a to stop operating when the first spring 51 is in the abnormal state, thereby further improving the unlocking stability and reliability.

[0044] It should be noted that in the prior art, the position information of the lifting seat 42 is detected to determine whether the arm pin 10 is extended to the position, however, due to assembly error, gap between the slot wall of the adapter slot 421 and the adapter block 34 and other reasons, the arm pin 10 is not extended to the position in the case that the lifting seat 42 is lifted to the position, and then the arm section locking is unstable, mispositioned, cannot be extended and other situations, even causes arm falling, arm pin 10 breaking and other safety hazards, poor locking stability and low reliability, and when the inner arm section 201 produces deflection, the lifting seat 42 produces position deviation in the length direction of the inner arm section 201 relative to the adapter block 34, is extremely easy to interfere with the plug-in rod 30 and then collide with the plug-in rod 30 to cause the plug-in rod 30 to break, and it is difficult to accurately determine whether the arm pin 10 is extended to the position.

[0045] The telescopic arm locking device of the embodiment of the present application realizes detection and control of the extension and retraction action of the arm pin 10 from the aspects of mechanical structure, electricity and hydraulic pressure, and then accurately determines whether the arm pin 10 is extended to the position, greatly improves the stability, reliability and fault tolerance of the unlocking.

[0046] It can be understood that when the outer arm section 202 needs to be locked, the limiting ball 20 falls into the second accommodating groove 31b to push the second piezoelectric sensor 61b, the current generated by the second piezoelectric sensor 61b is transmitted to the current transmission end 621 through the electric connection line 62, the second current sensor 63b detects the current signal of the current transmission end 621 to determine that the limiting ball 20 falls into the second accommodating groove 31b, the second current sensor 63b transmits the detection result to the controller 65, the controller 65 determines that the arm pin 10 normally extends to control the telescopic oil cylinder 41a to drive the lifting seat 42 to rise to lock the outer arm section 202 in the case of determining that the second current sensor 63b detects the current signal, and determines that the arm pin 10 abnormally extends to control the telescopic oil cylinder 41a to stop running in the case of determining that the second current sensor 63b does not detect the current signal, thereby realizing reliable protection of the telescopic arm 200 and the telescopic arm locking device, and the pressure sensor 64 detects the pressure of the telescopic oil cylinder 41a during the extension of the plug-in rod 30 and sends the detection result to the controller 65, the controller 65 judges the second spring 52 to be in a normal state or an abnormal state according to the pressure of the telescopic oil cylinder 41a, so as to realize that the arm pin 10 locks the outer arm section 202 in the case of the second spring 52 being in the normal state, and controls the telescopic oil cylinder 41a to stop running in the case of the second spring 52 being in the abnormal state, thereby further improving the locking stability and reliability. The telescopic arm locking device in the embodiment of the application realizes detection and control of the telescoping action of the arm pin 10 from the aspects of mechanical structure, electricity and hydraulic pressure by cooperation of the limiting ball 20 and the second accommodating groove 31b, detection of the position information of the limiting ball 20 by the second piezoelectric sensor 61b, detection of the current signal of the second piezoelectric sensor 61b by the second current sensor 63b and detection of the pressure of the telescopic oil cylinder 41a by the pressure sensor 64, thereby accurately judging whether the arm pin 10 is telescoped in place, and greatly improving the stability, reliability and fault tolerance of unlocking.

[0047] In the embodiment of the application, the telescopic arm locking device further comprises a limiting baffle 70, the limiting baffle 70 is arranged on the inner arm section 201 and is provided with a through hole for the arm pin 10 to pass through, and the limiting baffle 70 abuts against the limiting ball 20 in the case that the accommodating groove 31 is misaligned with the mounting hole 11. As shown in Figure 1 As shown in Figure 3As shown, in the case that the arm pin 10 is retracted to the position to unlock the outer arm section 202, the limiting ball 20 abuts against the lower side of the limiting baffle 70, so that the limiting baffle 70 limits the extension of the arm pin 10 through the abutment of the limiting ball 20 and the limiting baffle 70, thereby limiting the extension of the arm pin 10 through the abutment of the limiting baffle 70 and the limiting ball 20, and further positioning the arm pin 10 at the position of locking or unlocking the outer arm section 202, improving the positioning stability and reliability of the arm pin 10, and the limiting baffle 70 is convenient to replace, improving the convenience of maintenance.

[0048] Further, as shown in Figure 1 and Figure 6 the arm pin 10 is provided with a stop boss 14 for abutting against the limiting baffle 70 to limit the extension of the arm pin 10, in the case that the arm pin 10 is extended to the position to lock the outer arm section 202, the limiting ball 20 abuts against the upper side of the limiting baffle 70, and the stop boss 14 abuts against the lower side of the limiting baffle 70, further improving the positioning reliability and stability of the arm pin 10.

[0049] In addition, the present application also provides a working machine, the working machine comprising a telescopic arm system, the telescopic arm system comprising the telescopic arm locking device according to the above description, specifically, the working machine can be provided as a truck crane, a wheel crane or the like working machine having a telescopic arm 200, the telescopic arm system comprising the telescopic arm 200 and the telescopic arm locking device, and the specific structure of the telescopic arm locking device refers to the above-mentioned embodiments, since the working machine and the telescopic arm system adopt all the technical solutions of the above-mentioned embodiments, at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are possessed, which will not be described one by one here.

[0050] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A telescopic arm locking device, characterized in that, The telescopic arm locking device comprises: An arm pin (10) is telescopically arranged on an inner arm section (201) of a telescopic arm (200) and used for locking an outer arm section (202) of the telescopic arm (200), and a mounting hole (11) is formed in the arm pin (10); A plug-in mechanism comprises a limiting ball (20), a plug-in rod (30) and a telescopic driving assembly (40), the limiting ball (20) is arranged in the mounting hole (11), the plug-in rod (30) is telescopically arranged through the arm pin (10) and is provided with a containing groove (31), the telescopic driving assembly (40) is used for driving the plug-in rod (30) to telescope, the limiting ball (20) falls into the containing groove (31) when the containing groove (31) is aligned with the mounting hole (11), so that the plug-in rod (30) can drive the arm pin (10) to telescope through the limiting ball (20), and the limiting ball (20) abuts against the plug-in rod (30) when the containing groove (31) is misaligned with the mounting hole (11), so that the limiting ball (20) is arranged outside the mounting hole (11) and limits the telescoping of the arm pin (10).

2. The telescoping arm locking device of claim 1, wherein, A mounting cavity (12) is formed in the arm pin (10) for the plug-in rod (30) to pass through, the mounting hole (11) is communicated with the mounting cavity (12), a mounting groove (13) is formed in a cavity wall of the mounting cavity (12), and the plug-in mechanism further comprises a reset driving assembly (50), which is arranged in the mounting groove (13) and used for driving the plug-in rod (30) to reset and abut against the limiting ball (20).

3. The telescoping arm locking device of claim 2, wherein, A containing groove group is formed in the plug-in rod (30), the containing groove group comprises two containing grooves (31) arranged at intervals along the length direction of the plug-in rod (30), the two containing grooves (31) are respectively a first containing groove (31a) and a second containing groove (31b), a limiting abutting table (32) is formed between the first containing groove (31a) and the second containing groove (31b), the first containing groove (31a) and the second containing groove (31b) are respectively used for allowing the limiting ball (20) to fall into, and the reset driving assembly (50) is used for driving the plug-in rod (30) to reset so that the limiting abutting table (32) abuts against the limiting ball (20).

4. The telescoping arm locking device of claim 3, wherein, The reset driving assembly (50) comprises a first spring (51) and a second spring (52), both of which are sleeved on the plug-in rod (30), the mounting groove (13) has oppositely arranged first and second push groove walls (131, 132), the plug-in rod (30) is provided with a push boss (33), and the two ends of the first spring (51) are respectively in one-to-one correspondence with the first push groove wall (131) and the push boss (33) and abut against them, and the two ends of the second spring (52) are respectively in one-to-one correspondence with the second push groove wall (132) and the push boss (33) and abut against them.

5. The telescoping arm locking device of claim 2, wherein, The telescopic arm locking device further comprises a detection assembly (60), and the detection assembly (60) comprises a piezoelectric sensor (61) arranged in the accommodating groove (31) and used for detecting position information of the limiting ball (20).

6. The telescoping arm locking device of claim 5, wherein, The telescopic driving assembly (40) comprises a telescopic driving member (41) arranged in the inner arm segment (201) and used for driving the lifting seat (42) to lift and lower, and the lifting seat (42) is provided with an adapter groove (421), and the plug-in rod (30) is provided with an adapter block (34) connected in the adapter groove (421).

7. The telescoping arm locking device of claim 6, wherein, The detection assembly (60) further comprises an electric connection wire (62) and a current sensor (63), the electric connection wire (62) passes through the plug-in rod (30), one end of the electric connection wire (62) is electrically connected with the piezoelectric sensor (61), the other end of the electric connection wire (62) is provided as a current transmission end (621), and the current sensor (63) is arranged in the adapter groove (421) and used for detecting a current signal of the current transmission end (621).

8. The telescoping arm locking device of claim 6, wherein, The telescopic driving member (41) is a telescopic oil cylinder (41a), the detection assembly (60) further comprises a pressure sensor (64) used for detecting pressure of the telescopic oil cylinder (41a) and a controller (65) in communication connection with the pressure sensor (64) and configured to determine a working state of the reset driving assembly (50) according to the pressure of the telescopic oil cylinder (41a) and control an operating state of the telescopic oil cylinder (41a) according to the working state of the reset driving assembly (50).

9. A telescopic arm locking device according to any one of claims 1 to 8, wherein The telescopic arm locking device further comprises a limiting baffle (70) arranged on the inner arm segment (201) and provided with a through hole through which the arm pin (10) passes, and the limiting baffle (70) abuts against the limiting ball (20) when the accommodating groove (31) is misaligned with the mounting hole (11).

10. A work machine characterized by, The work machine comprises a telescopic arm support system, and the telescopic arm support system comprises the telescopic arm locking device according to any one of claims 1 to 9.

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