Telescopic booms and construction machinery

Abstract

The present invention relates to the field of engineering machinery and discloses a telescopic boom and engineering machinery. The telescopic boom includes an outer boom section, an inner boom section, and a locking assembly. The locking assembly includes a wedge-shaped seat, a locking block, a driving mechanism, and an elastic member. The wedge-shaped seat is fixedly disposed on the outer wall of the inner boom section and has a guiding slope facing the inner wall of the outer boom section. The guiding slope is inclined relative to the axis of the inner boom section. The locking block is disposed on the guiding slope and is capable of sliding between a locked position and an unlocked position. In the locked position, the locking block abuts against the inner wall of the outer boom section. In the unlocked position, a gap is formed between the locking block and the inner wall of the outer boom section. The elastic member is configured to provide an elastic force that causes the locking block to slide toward the unlocked position. The driving mechanism is configured to drive the locking block to slide to the locked position against the elastic force of the elastic member. By providing the locking assembly, the present invention can effectively prevent the rapid sliding of the inner boom section from causing a large impact, which could lead to safety accidents such as breakage of the telescopic boom.

Description

Technical Field

[0001] The present invention belongs to the field of engineering machinery, and in particular relates to a telescopic boom and engineering machinery using the telescopic boom. Background Art

[0002] In existing engineering machinery, such as fire trucks, cranes, aerial work platforms, etc., telescopic booms are widely used. The telescopic boom generally includes an outer arm section and an inner arm section that are nested with each other. A transmission mechanism or a drive mechanism is provided between the inner arm section and the outer arm section. The transmission mechanism or the drive mechanism drives the inner arm section to slide relative to the outer arm section so that the inner arm section extends or retracts relative to the outer arm section, thereby realizing the lifting or lowering operation of the telescopic boom. In actual application, during the lifting process of the telescopic boom, when the transmission mechanism or the drive mechanism fails or is damaged, it is easy to cause the inner arm section to slide rapidly. The rapid sliding of the inner arm section will cause a greater impact, which may cause safety accidents such as the breakage of the telescopic boom, posing a greater safety hazard. Summary of the Invention

[0003] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a telescopic boom and engineering machinery, aiming to solve the technical problem that the inner arm section of the telescopic boom of the existing engineering machinery is prone to rapid sliding, causing a large impact and leading to accidents such as the breakage of the telescopic boom.

[0004] To achieve the above object, the present invention provides a telescopic boom, comprising:

[0005] outer arm segment;

[0006] an inner arm section slidably nested in the outer arm section; and

[0007] The locking assembly includes a wedge-shaped seat, a locking block, a driving mechanism and an elastic member, wherein the wedge seat is fixedly arranged on the outer wall of the inner arm section and has a guiding inclined surface facing the inner wall of the outer arm section, the guiding inclined surface is inclined relative to the axis of the inner arm section, the locking block is arranged on the guiding inclined surface and can slide between a locked position and an unlocked position along the inclined direction of the guiding inclined surface. When in the locked position, the locking block abuts against the inner wall of the outer arm section. When in the unlocked position, a gap is formed between the locking block and the inner wall of the outer arm section. The elastic member is used to provide an elastic force that causes the locking member to slide toward the unlocked position, and the driving mechanism is used to drive the locking block to overcome the elastic force of the elastic member and slide to the locked position.

[0008] Optionally, a slide rail extending along the inclined direction is provided on the guide slope, a first limit plate is provided on one end of the slide rail close to the axis of the inner arm section, and a second limit plate is provided on the other end away from the axis of the inner arm section, and the locking block is provided between the first limit plate and the second limit plate and is slidably connected to the slide rail.

[0009] Optionally, the driving mechanism includes:

[0010] a pneumatic push rod, wherein the cylinder of the pneumatic push rod is fixedly arranged on the side of the first limit plate away from the locking block, and the piston rod of the pneumatic push rod passes through the first limit plate and abuts against the locking block;

[0011] A gas tank and a control valve, the control valve having a first interface, a second interface and a third interface, the first interface being connected to the rodless cavity of the pneumatic push rod, the second interface being connected to the gas tank, and the third interface being connected to the outside world, the control valve having two states: connecting the first interface to the second interface and connecting the first interface to the third interface.

[0012] Optionally, the cylinder body of the pneumatic push rod is provided with a vent connecting the rod cavity of the pneumatic push rod with the outside world.

[0013] Optionally, the elastic member is a pressure spring, which is arranged between the second limiting plate and the locking block, with one end of the elastic member abutting against the second limiting plate and the other end abutting against the locking block.

[0014] Optionally, the locking assembly includes a plurality of elastic members, and the plurality of elastic members are arranged side by side between the second limiting plate and the locking block.

[0015] The present invention also provides an engineering machine comprising the telescopic boom.

[0016] Optionally, the engineering machinery further includes:

[0017] a displacement sensor, configured to detect displacement information of the inner arm segment; and

[0018] A locking controller is used to control the driving mechanism to start and drive the locking block to slide to the locking position when it is determined that the inner arm section is in a stall state according to the displacement information.

[0019] Optionally, the locking controller is further configured to control the driving mechanism to stop driving the locking block when it is determined based on the displacement information that the inner arm section is not in a stalled state, so that the locking block slides to the unlocking position under the elastic force of the elastic member.

[0020] Optionally, the displacement sensor is a wire sensor.

[0021] In the telescopic arm of the present invention, a locking assembly is provided. When the locking block in the locking assembly is in the locking position, the locking block presses against the inner wall of the outer arm section. The relative sliding between the outer arm section and the inner arm section can be locked through the mutual friction between the locking block and the inner wall of the outer arm section. When the locking block in the locking assembly is in the unlocking position, a gap is formed between the locking block and the inner wall of the outer arm section, and there is no contact and friction between the locking block and the outer arm section. At this time, the outer arm section and the inner arm section can slide normally relative to each other. In this way, when the transmission mechanism or driving mechanism between the outer arm section and the inner arm section fails or is damaged, causing the inner arm section to slide rapidly relative to the outer arm section, the driving mechanism can drive the locking block to slide to the locking position and timely lock the relative sliding between the outer arm section and the inner arm section, effectively avoiding the rapid sliding of the inner arm section to cause a large impact, resulting in safety accidents such as the telescopic arm section breaking.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of an engineering machine in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 Partial side view of the telescopic boom Figure 1 ;

[0026] Figure 3 for Figure 1 Partial side view of the telescopic boom Figure 2 ;

[0027] Figure 4 for Figure 1 A top view of the locking assembly in FIG.

[0028] Figure 5 for Figure 1 Side view of the locking assembly in FIG.

[0029] Description of reference numerals:

[0030] 1 outer arm segment

[0031] 2 inner arm segments

[0032] 3 Locking assembly

[0033] 31 wedge-shaped seat 311 guide slope

[0034] 312 slide rail 313 first limit plate

[0035] 314 second limit plate 32 locking block

[0036] 33 driving mechanism 331 pneumatic push rod

[0037] 332 Gas Tank 333 Control Valve

[0038] 34 elastic parts

[0039] 4 Displacement Sensor

[0040] 5 Locking controller

[0041] 6 Control System

[0042] 7 Control switch DETAILED DESCRIPTION

[0043] The following describes the specific embodiments of the present invention in detail 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 invention and are not intended to limit the present invention.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0045] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positions of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0047] The present invention first provides a telescopic boom.

[0048] In one embodiment, referring to the attached Figure 1 To the attached Figure 5As shown, the telescopic arm frame includes an outer arm section 1, an inner arm section 2 and a locking assembly 3. The inner arm section 2 can be slidably nested in the outer arm section 1. The locking assembly 3 includes a wedge seat 31, a locking block 32, a driving mechanism 33 and an elastic member 34. The wedge seat 31 is fixedly arranged on the outer wall of the inner arm section 2 and has a guide slope 311 facing the inner wall of the outer arm section 1. The guide slope 311 is inclined relative to the axis of the inner arm section 2. The locking block 32 is arranged on the guide slope 311 and can slide between a locked position and an unlocked position along the inclined direction of the guide slope 311. In the locked position, the locking block 32 abuts against the inner wall of the outer arm section 1. In the unlocked position, a gap is formed between the locking block 32 and the inner wall of the outer arm section 1. The elastic member 34 is used to provide an elastic force that causes the locking member to slide toward the unlocked position. The driving mechanism 33 is used to drive the locking block 32 to overcome the elastic force of the elastic member 34 and slide to the locked position.

[0049] It can be understood that in the telescopic boom of this embodiment, a locking assembly 3 is provided. When the locking block 32 in the locking assembly 3 is in the locked position, the locking block 32 abuts against the inner wall of the outer arm section 1. The relative sliding between the outer arm section 1 and the inner arm section 2 can be locked by the mutual friction between the locking block 32 and the inner wall of the outer arm section 1. When the locking block 32 in the locking assembly 3 is in the unlocked position, a gap is formed between the locking block 32 and the inner wall of the outer arm section 1, and the gap between the locking block 32 and the outer arm section 1 is formed. There is no contact and friction between the outer arm section 1 and the inner arm section 2. At this time, the outer arm section 1 and the inner arm section 2 can slide normally relative to each other. In this way, when the transmission mechanism or the driving mechanism between the outer arm section 1 and the inner arm section 2 fails or is damaged, causing the inner arm section 2 to slide rapidly relative to the outer arm section 1, the driving mechanism 33 can drive the locking block 32 to slide to the locking position and timely lock the relative sliding between the outer arm section 1 and the inner arm section 2, effectively avoiding the rapid sliding of the inner arm section 2 to cause a large impact, resulting in safety accidents such as the breakage of the telescopic arm frame.

[0050] Specifically, the guiding bevel 311 is tilted relative to the axis of the inner arm section 2, and the guiding bevel 311 can be tilted toward the axis of the inner arm section 2 from the extended end close to the inner arm section 2 to the extended end away from the inner arm section 2. With this arrangement, when the inner arm section 2 slides relative to the outer arm section 1, the driving mechanism 33 drives the locking block 32 to slide to the locking position so that the locking block 32 abuts against the inner wall of the outer arm section 1. The relative sliding between the inner wall of the outer arm section 1 and the locking block 32 can further increase the pressure between the locking block 32 and the inner wall of the outer arm section 1, thereby further increasing the friction between the locking block 32 and the inner wall of the outer arm section 1, effectively improving the locking effect; of course, in other embodiments, the guiding bevel 311 is tilted relative to the axis of the inner arm section 2, and the guiding bevel 311 can also be tilted toward the axis of the inner arm section 2 from the extended end away from the inner arm section 2 to the extended end close to the inner arm section 2.

[0051] Specifically, the locking block 32 has a sliding inclined surface and a friction surface arranged in opposite directions. The sliding inclined surface and the friction surface are arranged at an angle. The inclination direction of the sliding inclined surface is consistent with the inclination direction of the guide inclined surface 311, so that the sliding inclined surface can fit on the guide inclined surface 311 and slide along the guide inclined surface 311. The friction surface is arranged parallel to the axis of the inner arm section 2, and is used for fitting on the inner wall of the outer arm section 1 and rubbing against the inner wall of the outer arm section 1 when the locking block 32 is in the locking position. In actual application, the angle between the friction surface and the sliding inclined surface and the friction coefficient of the friction surface are selected within an appropriate parameter range to ensure the locking effect of the locking block 32.

[0052] Specifically, in order to improve the service life and locking effect of the locking block 32 , a wear-resistant material with a high friction coefficient may be provided on the friction surface of the locking block 32 .

[0053] Specifically, the telescopic boom may include a plurality of locking assemblies 3, which are arranged at intervals along the circumference of the inner arm section 2. Such an arrangement can greatly improve the locking effect and reliability of the telescopic boom.

[0054] In one embodiment, referring to the attached Figure 4 As shown, a slide rail 312 extending along the inclined direction is provided on the guide inclined surface 311, a first limit plate 313 is provided at one end of the slide rail 312 close to the axis of the inner arm section 2, and a second limit plate 314 is provided at the other end away from the axis of the inner arm section 2, and the locking block 32 is provided between the first limit plate 313 and the second limit plate 314 and is slidably connected to the slide rail 312.

[0055] The first and second limit switches 313 and 314 are used to adjust the position of the locking block 32 so that the locking block 32 can slide on the guide bevel 311 and the unlocking position, respectively. The first limit switch 313 and the second limit switch 314 can limit the locking block 32 on the guide bevel 311 and maintain the connection with the slide rail 312, thereby effectively preventing the locking block 32 from slipping out of the slide rail 312 and causing position deviation and failure to achieve normal locking, thereby improving the reliability of the locking assembly 3.

[0056] Specifically, the slide rail 312 , the first limiting plate 313 and the second limiting plate 314 can be fixedly connected to the guide slope 311 by welding, bolt fastening or integral molding.

[0057] Specifically, a plurality of slide rails 312 may be provided on the guide slope 311. The plurality of slide rails 312 are arranged side by side and are all slidably connected to the locking block 32. With such an arrangement, the plurality of slide rails 312 jointly guide the locking block 32, thereby effectively improving the stability and reliability of the structure.

[0058] In one embodiment, referring to the attached Figure 5As shown, the driving mechanism 33 includes a pneumatic push rod 331, an air tank 332 and a control valve 333. The cylinder body of the pneumatic push rod 331 is fixedly arranged on the side of the first limit plate 313 away from the locking block 32, and the piston rod of the pneumatic push rod 331 passes through the first limit plate 313 and presses against the locking block 32. The control valve 333 has a first interface, a second interface and a third interface. The first interface is connected to the rodless cavity of the pneumatic push rod 331, the second interface is connected to the air tank 332, and the third interface is connected to the outside world. The control valve 333 has two states: the first interface is connected to the second interface and the first interface is connected to the third interface.

[0059] It can be understood that when locking is required between the outer arm section 1 and the inner arm section 2, the first interface and the second interface are connected by controlling the valve 333, so that the gas tank 332 is connected to the rodless cavity of the pneumatic push rod 331, and the high-pressure gas in the gas tank 332 enters the rodless cavity of the pneumatic push rod 331, so that the rodless cavity of the pneumatic push rod 331 is formed into a high-pressure cavity, which pushes the piston rod of the pneumatic push rod 331 toward the rod cavity, and the piston rod abuts the locking block 32. The movement of the piston rod pushes the locking block 32 toward the second limit plate 314 until the locking block 32 abuts the inner wall of the outer arm section 1. When the outer arm section 1 and the inner arm section 2 are in the locked position, the high pressure in the rodless cavity of the pneumatic push rod 331 is maintained, so that the piston rod can maintain the thrust on the locking block 32, so that the locking block 32 is kept in the locked position. When the lock between the outer arm section 1 and the inner arm section 2 needs to be released, the first interface and the third interface are connected by controlling the valve 333, so that the rodless cavity of the pneumatic push rod 331 is connected to the outside atmosphere, and the high-pressure gas in the rodless cavity of the pneumatic push rod 331 is discharged to the outside. In this way, the piston rod of the pneumatic push rod 331 removes the thrust on the locking block 32, and the locking block 32 is reset to the unlocked position under the elastic force of the elastic member 34.

[0060] Specifically, the control valve 333 can adopt an electromagnetic valve, and the first interface of the control valve 333 can be connected to the rodless cavity of the pneumatic push rod 331 through a first air connection pipe, and the third interface of the control valve 333 can be connected to the gas tank 332 through a second air connection pipe.

[0061] Specifically, the driving mechanism 33 may also include a pressure gauge, which is arranged on the gas tank 332 and is used to detect the air pressure in the gas tank 332. With this arrangement, the staff can observe the air pressure in the gas tank 332 in real time through the pressure gauge. When the air pressure in the gas tank 332 is too low, high-pressure gas can be replenished in time to ensure the normal operation of the driving mechanism 33 and effectively improve the reliability of the locking assembly 3.

[0062] In other embodiments, the driving mechanism 33 may include an electric push rod, a motor and a push rod controller. The electric push rod is fixedly arranged on the side of the first limit plate 313 away from the locking block 32, and the push rod body of the electric push rod passes through the first limit plate 313 and presses against the locking block 32. The motor is transmission-connected to the push rod body of the electric push rod to drive the push rod body to slide and thereby drive the locking block 32. The push rod controller is electrically connected to the motor to control the operation of the motor, thereby controlling the sliding stroke of the push rod body of the electric push rod.

[0063] In one embodiment, the cylinder body of the pneumatic push rod 331 is provided with a vent connecting the rod chamber of the pneumatic push rod 331 with the outside world. With such a configuration, when the rodless chamber of the pneumatic push rod 331 is formed into a high-pressure chamber so that the piston rod slides toward the rod chamber, the gas in the rod chamber can be discharged to the outside world through the vent. In this way, it is effectively avoided that when the piston rod slides toward the rod chamber, the gas in the rod chamber is compressed, causing the increased air pressure in the rod chamber to hinder the sliding of the piston rod, thereby greatly improving the sliding speed of the piston rod, and thereby improving the locking speed of the locking assembly 3.

[0064] Specifically, the vent can be opened on the peripheral wall of the cylinder body of the pneumatic push rod 331 or can be opened on the end surface of the cylinder body of the pneumatic push rod 331 close to one end of the first limit plate 313. At this time, the first limit plate 313 can open a corresponding through hole corresponding to the vent.

[0065] In one embodiment, the elastic member 34 is a pressure spring, which is disposed between the second limiting plate 314 and the locking block 32 , with one end abutting against the second limiting plate 314 and the other end abutting against the locking block 32 .

[0066] In other embodiments, the elastic member 34 may be a tension spring. The elastic member 34 may be disposed between the first limiting plate 313 and the locking block 32 , with its two ends fixedly connected to the second limiting plate 314 and the locking block 32 , respectively.

[0067] In one embodiment, the locking assembly 3 includes a plurality of elastic members 34 , which are arranged side by side between the second limiting plate 314 and the locking block 32 . This arrangement effectively improves the reliability of the locking block 32 returning to the unlocked position.

[0068] The present invention further provides an engineering machine comprising the above-described telescopic boom. The specific structure of the telescopic boom is similar to that of the above-described embodiments. Since the present engineering machine utilizes all the technical solutions of all the above-described embodiments, it at least possesses all the beneficial effects brought about by the technical solutions of the above-described embodiments, and thus will not be described in detail here.

[0069] In one embodiment, referring to the attached Figure 1As shown, the engineering machinery can be a fire truck, a crane or an aerial work platform. Specifically, the engineering machinery includes a boom assembly, and the boom assembly includes at least one group of telescopic booms. For example, the boom assembly includes a base arm and a telescopic arm slidably nested in the base arm. The base arm and the telescopic arm constitute a group of telescopic booms. The base arm is an outer arm section 1, and the telescopic arm is an inner arm section 2. For another example, the telescopic arm may include multiple arm sections nested with each other, and two adjacent arm sections constitute a group of telescopic booms. The outer arm section 1 is located on the outside, and the inner arm section 2 is located on the inside.

[0070] In one embodiment, the engineering machinery further includes a displacement sensor 4 and a locking controller 5. The displacement sensor 4 is used to detect the displacement information of the inner arm section 2. The locking controller 5 is used to control the drive mechanism 33 to start and drive the locking block 32 to slide to the locking position when determining that the inner arm section 2 is in a stall state based on the displacement information.

[0071] It should be noted that the inner arm section 2 is in a stall state, that is, the sliding speed of the inner arm section 2 relative to the outer arm section 1 is greater than or equal to a preset speed threshold. This state is determined as a faulty slip of the inner arm section 2.

[0072] It can be understood that the situation of the inner arm section 2 can be monitored in real time through the displacement sensor 4. When the inner arm section 2 slips and is in a stalled state, the locking controller 5 can promptly control the drive mechanism 33 to start and drive the locking block 32 to slide to the locking position, thereby realizing the locking between the inner arm section 2 and the outer arm section 1, avoiding the occurrence of accidents, and also protecting the telescopic arm. In this way, the automatic control of the telescopic arm locking is realized, and the reliability of the telescopic arm locking is effectively improved.

[0073] Specifically, when the locking controller 5 determines that the inner arm section 2 is not in a stalled state based on the displacement information, it controls the driving mechanism 33 to stop driving the locking block 32 so that the locking block 32 slides to the unlocked position under the elastic force of the elastic member 34 .

[0074] In this embodiment, the locking controller 5 can be a hardware structure with control functions such as a central processing unit or a microprocessor. As for the locking controller 5 controlling the opening and closing or the operation time of the actuator (such as the drive mechanism 33 in this embodiment) based on a specific signal, it can be achieved through existing means and will not be explained in detail here.

[0075] Specifically, the engineering machinery also includes a control system 6 and a control switch 7. The control switch and the locking controller 5 are electrically connected to the control system respectively. The control switch is used to control the start or stop of the locking controller 5. With this arrangement, the operator can control the start or stop of the locking controller 5 through the control switch, which is very convenient.

[0076] In one embodiment, the displacement sensor 4 is a wire sensor.

[0077] Specifically, the sensor body of the wire-drawing sensor is fixedly arranged on the base arm of the engineering machinery, and the wire of the wire-drawing sensor is fixedly connected to the inner arm section 2 to be monitored.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0080] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A telescopic boom, characterized in that: include: Outer arm segment (1); An inner arm section (2) is slidably nested in the outer arm section (1); as well as A locking assembly (3) comprises a wedge-shaped seat (31), a locking block (32), a driving mechanism (33) and an elastic member (34), wherein the wedge-shaped seat (31) is fixedly arranged on the outer wall of the inner arm section (2) and has a guiding inclined surface (311) facing the inner wall of the outer arm section (1), wherein the guiding inclined surface (311) is inclined relative to the axis of the inner arm section (2), and the locking block (32) is arranged on the guiding inclined surface (311) and can be moved along the inclined direction of the guiding inclined surface (311) in the locking mechanism. Sliding between a locking position and an unlocking position, in the locking position, the locking block (32) abuts against the inner wall of the outer arm section (1), in the unlocking position, a gap is formed between the locking block (32) and the inner wall of the outer arm section (1), the elastic member (34) is used to provide an elastic force that causes the locking block (32) to slide toward the unlocking position, and the driving mechanism (33) is used to drive the locking block (32) to overcome the elastic force of the elastic member (34) and slide to the locking position; The driving mechanism (33) includes a pneumatic push rod (331), a control valve (333) and a gas tank (332), wherein the piston rod of the pneumatic push rod (331) abuts against the locking block (32), and the control valve (333) has a first interface, a second interface and a third interface, wherein the first interface is communicated with the rodless cavity of the pneumatic push rod (331), the second interface is communicated with the gas tank (332), and the third interface is communicated with the outside world, and the control valve (333) has two states: the first interface is communicated with the second interface and the first interface is communicated with the third interface; The telescopic boom is configured as follows: When the sliding speed of the inner arm section (2) relative to the outer arm section (1) is greater than or equal to a preset speed threshold, the inner arm section is determined to be in a stalled state and the control valve (333) is controlled to switch to connect the rodless cavity of the pneumatic push rod (331) with the gas tank (332), so as to drive the locking block (32) to overcome the elastic force of the elastic member (34) and slide to the locking position.

2. The telescopic boom according to claim 1, characterized in that: A slide rail (312) extending in an inclined direction is provided on the guide inclined surface (311); a first limiting plate (313) is provided at one end of the slide rail (312) close to the axis of the inner arm section (2); a second limiting plate (314) is provided at the other end away from the axis of the inner arm section (2); the locking block (32) is provided between the first limiting plate (313) and the second limiting plate (314) and is slidably connected to the slide rail (312).

3. The telescopic boom according to claim 1, characterized in that: The cylinder body of the pneumatic push rod (331) is provided with a vent that connects the rod cavity of the pneumatic push rod (331) with the outside world.

4. The telescopic boom according to claim 2, characterized in that: The elastic member (34) is a pressure spring, and is disposed between the second limiting plate (314) and the locking block (32), with one end abutting against the second limiting plate (314) and the other end abutting against the locking block (32).

5. The telescopic boom according to claim 4, characterized in that: The locking assembly (3) comprises a plurality of elastic members (34), and the plurality of elastic members (34) are arranged side by side between the second limiting plate (314) and the locking block (32).

6. An engineering machine, characterized in that: It comprises a telescopic boom according to any one of claims 1 to 5.

7. The engineering machine according to claim 6, characterized in that: The engineering machinery further comprises: a displacement sensor (4) for detecting displacement information of the inner arm section (2); and A locking controller (5) is used to control the driving mechanism (33) to start and drive the locking block (32) to slide to the locking position when it is determined that the inner arm section (2) is in a stalled state based on the displacement information.

8. The engineering machine according to claim 7, characterized in that: The locking controller (5) is further configured to control the driving mechanism (33) to stop driving the locking block (32) when determining that the inner arm section (2) is not in a stalled state based on the displacement information, so that the locking block (32) slides to the unlocking position under the elastic force of the elastic member (34).

9. The engineering machine according to claim 7, characterized in that: The displacement sensor (4) is a wire sensor.

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