Anti-collision device for arm support, anti-collision cylinder and engineering machinery

Abstract

This application relates to the field of protective device technology, disclosing a boom anti-collision device, an anti-collision cylinder, and engineering machinery. The boom anti-collision device includes a mounting base, an elastic element, a protective cover, an airbag release element, and a limiting element. The protective cover is elastically supported on the mounting base by the elastic element, forming a protective space between the protective cover and the mounting base. The protective cover is equipped with an airbag release element, which has a protective airbag to be released. The limiting element is used to control the release of the protective airbag and / or block the movement of the boom when triggered. The protective cover is used to compress the elastic element and trigger the limiting element when the impact force exceeds a preset anti-collision force. The boom anti-collision device provided by this application can cope with the impact of inertial displacement, improve anti-collision capability, and make it safer.

Description

Technical Field

[0001] This application belongs to the field of protective device technology, specifically relating to a boom anti-collision device, an anti-collision cylinder, and engineering machinery. Background Technology

[0002] Boom-type operating machinery has a high working height after the boom is extended, and the boom itself can obstruct the operator's view. In some operating scenarios, there are blind spots, and the operator cannot know the surrounding working environment of each position of the boom. Therefore, it is difficult to avoid the risks around the operation, such as collisions.

[0003] The power output for boom movement comes from the boom cylinder. The most critical and vulnerable component of the boom cylinder is the balance valve located outside the cylinder body. If the balance valve is hit, it may directly cause the hydraulic oil inside the boom cylinder to spray out and leak, resulting in cylinder depressurization, loss of boom rotation constraint, and rapid boom fall, causing a major safety accident.

[0004] Existing protective measures for hydraulic cylinders mainly focus on enhancing the impact resistance of the protective cover or using sensors to detect obstacles and promptly cut off the power input to the drive mechanism. However, due to the slender structural characteristics of the boom, even if the power input to the drive mechanism is cut off in time, inertial displacement within the deflection range will still occur, making it impossible to prevent a collision with the boom. Therefore, existing protective measures cannot effectively solve the problem of boom collision protection. Summary of the Invention

[0005] The purpose of this application is to provide a boom anti-collision device, an anti-collision cylinder, and engineering machinery to solve the problem that existing protective measures cannot effectively solve the problem of boom anti-collision.

[0006] To achieve the above objectives, a first aspect of this application provides a boom anti-collision device, comprising:

[0007] Mounting base for mounting on the boom;

[0008] An elastic element is disposed on the mounting base;

[0009] The protective cover is elastically supported on the mounting base by the elastic element, and a protective space is formed between the protective cover and the mounting base. The protective cover is provided with an airbag release element, and the airbag release element has a protective airbag to be released.

[0010] A limiting element is arranged within the protective space, and the limiting element is used to control the release of the protective airbag and / or block the movement of the boom when triggered;

[0011] The protective cover is used to compress the elastic element and trigger the limiting element when the impact force is greater than the preset anti-collision force.

[0012] As a further improvement to the above technical solution:

[0013] In some embodiments, the protective cover is provided with a triggering element for triggering the limiting element, and in the initial state, the triggering element is located above the triggering end of the limiting element;

[0014] The triggering element and the limiting element are either impact-triggered or induction-triggered.

[0015] In some embodiments, when the initial state is defined, the distance from the triggering element to the triggering end of the limiting element is X, and the stroke of the protective cover compressing the elastic element when it collides is D;

[0016] Wherein, the preset anti-collision force is F anti-collision force = N*K*X, the impact force is F impact force = N*K*D, and when D≥X, the limiting element is triggered, where K is the elastic coefficient of the elastic element and N is the number of the elastic elements.

[0017] In some embodiments, both the airbag release element and the limiting element are communicatively connected to a controller. The controller is used to receive a trigger signal from the limiting element and control the airbag release element to release the protective airbag according to the trigger signal, and / or to block the movement of the boom according to the trigger signal.

[0018] In some embodiments, the limiting element is a limit switch, and the protective cover is provided with a triggering element for triggering the limit switch, wherein the triggering element is a wedge block;

[0019] Wherein, the trigger angle of the limit switch is P, the slope angle of the wedge block is Q, and P = Q.

[0020] In some embodiments, the elastic element includes:

[0021] Guide members are disposed on the mounting base; and

[0022] An elastic buffer element is disposed on the guide element to support the protective cover.

[0023] In some embodiments, the protective cover has reinforcing ribs on the inner wall near the protective space, the reinforcing ribs being adapted to the shape of the inner wall and extending along the width direction of the inner wall.

[0024] In some embodiments, the protective cover includes at least one cover body with heat dissipation holes.

[0025] To achieve the above objectives, a second aspect of this application provides an anti-collision cylinder for a boom, comprising:

[0026] Hydraulic cylinder body;

[0027] A balance valve assembly is mounted on the cylinder body of the hydraulic cylinder; and

[0028] According to the boom anti-collision device provided in the first aspect above, the mounting base is disposed on the cylinder body, and the balance valve assembly is housed in the protective space.

[0029] As a further improvement to the above technical solution:

[0030] In some embodiments, the mounting base includes:

[0031] Base;

[0032] The card holder is detachably mounted on the base and forms a constraint opening between the card holder and the base that is adapted to the shape of the cylinder body;

[0033] The cylinder body is interference-fitted with the constraint port; or, the cylinder body is provided with an anti-rotation block, and the card holder is provided with a slot for engaging the anti-rotation block.

[0034] To achieve the above objectives, a third aspect of this application provides an engineering machine, including a boom anti-collision device provided according to the first aspect, and / or a boom anti-collision cylinder provided according to the second aspect.

[0035] Compared with the prior art, the boom anti-collision device, anti-collision cylinder and engineering machinery provided in this application have at least the following beneficial effects:

[0036] The boom anti-collision device provided in this application uses an elastic element to support the protective cover and the mounting base, forming a protective space between them to protect the boom and its functional components. A limiting element controls the release of the protective airbag and / or blocks the boom's movement when triggered. The protective cover compresses the elastic element and triggers the limiting element when the impact force exceeds a preset anti-collision force. Therefore, after the protective cover is impacted, the device first uses the elastic element to partially offset the impact by compressing it, thus achieving a buffering and shock absorption effect. When the impact force is too large and exceeds the preset anti-collision force, and the elastic element's elastic support cannot resist the impact, the protective cover compresses the elastic element and further triggers the limiting element. Once triggered, the airbag release element releases a protective airbag on the surface of the protective cover, thus blocking the impact between the protective cover and the object, and simultaneously blocking the boom's movement. This effectively copes with the impact of inertial displacement, improves anti-collision capability, protects equipment safety, and enhances operational safety.

[0037] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0039] Figure 1 A partial structural schematic diagram of the first type of boom anti-collision device provided in the embodiments of this application;

[0040] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0041] Figure 3 for Figure 1 A three-dimensional structural diagram of the protective cover in the boom anti-collision device shown.

[0042] Figure 4 A three-dimensional structural diagram of two boom anti-collision devices spliced ​​together by connecting plates, as provided in the embodiments of this application;

[0043] Figure 5 This is a partial structural schematic diagram of the second type of boom anti-collision device provided in the embodiments of this application;

[0044] Figure 6 for Figure 5 A magnified view of a portion of point B in the middle;

[0045] Figure 7 for Figure 5 The diagram shows the structure of the second type of boom anti-collision device that was not impacted.

[0046] Figure 8 for Figure 5 The diagram shows the structure of the second type of boom anti-collision device after it is subjected to an impact.

[0047] Figure 9 This is a schematic diagram of the structure of an anti-collision hydraulic cylinder provided in an embodiment of this application;

[0048] Figure 10 This is an exploded view of the mounting base in the anti-collision cylinder provided in an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures

[0050] 100. Boom anti-collision device; 110. Mounting base; 111. Base; 112. Locking seat; 1120. Locking slot; 120. Elastic element; 121. Guide component; 1210. First limiting part; 1211. Guide part; 1212. Second limiting part; 122. Elastic buffer component; 130. Protective cover; 130a. Protective space; 131. Cover body; 1310. Triggering element; 1311. Mounting hole; 1312. Reinforcing rib; 1313. Heat dissipation hole; 1314. Splicing hole; 132. Connecting plate; 140. Airbag protection module; 141. Airbag release element; 142. Limiting element;

[0051] 200. Hydraulic cylinder body;

[0052] 300. Balance valve assembly. Detailed Implementation

[0053] The specific embodiments of this application 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 this application.

[0054] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0055] Example 1

[0056] Please see Figure 1 and Figure 2 This embodiment provides a boom anti-collision device 100. The boom anti-collision device 100 can protect vulnerable parts on the boom, such as the balance valve on the hydraulic cylinder or other sensors.

[0057] The boom anti-collision device 100 provided in this embodiment includes a mounting base 110, an elastic element 120, and a protective cover 130. The mounting base 110 is used to be installed on the boom and can be connected to the base of the component to be protected on the boom. At the same time, the mounting base 110 can also provide installation and support for the elastic element 120 and the protective cover 130.

[0058] An elastic element 120 is disposed on the mounting base 110, and a protective cover 130 is disposed on the elastic element 120. That is, the protective cover 130 is elastically supported on the mounting base 110 by the elastic element 120. A protective space 130a is formed between the protective cover 130 and the mounting base 110. Thus, the functional components on the boom to be protected can be accommodated in the protective space 130a, so that protection is achieved by shielding the components with the protective cover 130.

[0059] In this embodiment, the protective cover 130 is elastically supported by the elastic element 120. Thus, the protective cover 130, under the elastic support of the elastic element 120, has the freedom to float up and down relative to the mounting base 110. Therefore, when the protective cover 130 is impacted, the elastic support of the elastic element 120 can offset part of the impact, achieving a buffering and shock-absorbing effect, thereby effectively protecting against inertial impacts, improving collision avoidance capability, protecting equipment safety, and improving operational safety.

[0060] Furthermore, multiple elastic elements 120 can be provided to provide stable support for the protective cover 130 and improve its impact resistance. It is understood that the number of elastic elements 120 can be designed according to the impact resistance requirements of the boom. Different functional components on the boom have different impact resistance requirements, so the design of the number of elastic elements 120 will also differ. Therefore, in this embodiment, the number of elastic elements 120 is not specifically limited.

[0061] The aforementioned elastic element 120 includes a guide 121 and an elastic buffer 122. The guide 121 is disposed on the mounting base 110, and the elastic buffer 122 is disposed on the guide portion 1211, for elastically supporting the protective cover 130.

[0062] Specifically, the guide member 121 includes a first limiting part 1210, a guide part 1211, and a second limiting part 1212 arranged sequentially along its length. The first limiting part 1210 is connected to the mounting base 110, the guide part 1211 passes through a mounting hole 1311 on the protective cover 130 and is clearance-fitted with the mounting hole 1311, and the second limiting part 1212 is located on the side of the protective cover 130 away from the mounting base 110, with a width greater than the size of the mounting hole 1311.

[0063] The elastic buffer 122 can be selected as a compression spring, which is sleeved on the guide portion 1211. The two ends of the elastic buffer 122 abut against the mounting base 110 and the protective cover 130, respectively. The elastic buffer 122 has elastic deformation capability, so on the one hand, it provides support for the protective cover 130, and on the other hand, it ensures that the protective cover 130 has a degree of freedom of floating along the length direction of the guide portion 1211.

[0064] Optionally, the guide 121 can be a bolt and nut assembly, wherein the first limiting part 1210 is the head of the bolt, the guide part 1211 is a screw, and the second limiting part 1212 can be a nut. The nut can be screwed onto the screw to prevent the protective cover 130 from dislodging from the screw. The elastic buffer 122 is sleeved on the screw.

[0065] Optionally, the elastic buffer 122 may also be a spring sheet or a gas spring, etc. It should be understood that the above are merely illustrative examples and are not intended to limit the scope of protection of this application.

[0066] Please refer to the following: Figure 3 In this embodiment, the protective cover 130 is formed by bending a single piece of sheet metal into a U-shape, thereby giving the protective cover 130 better resistance to impact deformation. Of course, in other embodiments, multiple sheets of sheet metal can also be welded together.

[0067] Please refer to the following: Figure 3 In some embodiments, the protective cover 130 has reinforcing ribs 1312 on its inner wall near the protective space 130a. The reinforcing ribs 1312 are adapted to the shape of the inner wall and extend along the width direction of the inner wall. This provides the protective cover 130 with resistance to deformation.

[0068] Optionally, multiple reinforcing ribs 1312 can be designed, with the multiple reinforcing ribs 1312 arranged at intervals along the length of the protective cover 130.

[0069] Optionally, the reinforcing rib 1312 and the protective cover 130 are integrally formed or connected together by welding.

[0070] Please see Figure 1 and Figure 3 In some embodiments, the protective cover 130 has multiple mounting holes 1311 along its length, and the elastic element 120 passes through the mounting holes 1311 and connects to the mounting base 110. In this way, different mounting holes 1311 can be selected to connect to the elastic element 120, thereby adjusting the installation position of the protective cover 130 on the mounting base 110 for better protection of the components.

[0071] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, the protective cover 130 further includes at least one cover body 131. It is understood that the protective cover 130 may also have only one cover body 131, i.e., used alone. Of course, multiple cover bodies 131 may also be used in combination.

[0072] When multiple covers 131 are used in combination, each cover 131 has splicing holes 1314 at both ends for connecting with adjacent covers 131. The protective cover 130 also includes a connecting plate 132, which is installed on the splicing holes 1314 to connect two adjacent covers 131.

[0073] Optionally, the connecting plate 132 and the cover 131 are detachably connected by fasteners (bolts or screws).

[0074] Thus, when the length of a single cover 131 is insufficient, the covers 131 can be spliced ​​together using connecting plates 132, thereby lengthening the entire protective cover 130 and increasing the protected area. Alternatively, it can also connect the covers 131 to each other between two boom anti-collision devices 100, improving the stability and protection range of the boom anti-collision device 100 installation.

[0075] Furthermore, the protective cover 130 has multiple heat dissipation holes 1313 on its cover 131 to facilitate heat dissipation of the components and prevent the functional components from failing to dissipate heat in time during operation, thus affecting normal operation.

[0076] Furthermore, in this embodiment, the boom anti-collision device 100 also includes a bladder protection module 140. The bladder protection module 140 includes an airbag release element 141 and a limiting element 142 linked to the airbag release element 141. The airbag release element 141 is disposed on the protective cover 130, and the airbag release element 141 includes a gas generator (not shown) and an airbag to be released (not shown). The gas generator is used to inflate the airbag with gas.

[0077] The limiting element 142 is arranged within the protective space 130a, specifically on the mounting base 110 or on the base of the boom. In this embodiment, the limiting element 142 is arranged on the mounting base 110 as an example for illustration.

[0078] The protective cover is used to compress the elastic element and trigger the limiting element when the impact force exceeds the preset anti-collision force. The limiting element 142 is used to control the release of the protective airbag and / or block the movement of the boom when triggered. It is understood that the airbag release element 141 releases the protective airbag on the surface of the protective cover 130 to form a barrier between the protective cover 130 and the impacting object, preventing a re-collision.

[0079] Both the airbag release element 141 and the limiting element 142 are externally connected to a controller, specifically via a communication connection, which can be wired or wireless. Thus, the controller receives a trigger signal from the limiting element 142 and controls the gas generator in the airbag release element 141 to instantly inflate the protective airbag, causing it to expand and release. This release isolates the protective shield 130 from the impact object, further enhancing the protective effect and achieving coordinated operation between the airbag release element 141 and the limiting element 142.

[0080] The protective cover 130 is provided with a trigger element 1310 for triggering the limiting element 142. The state in which the protective cover 130 does not collide is defined as the initial state. In this state, the elastic element 140 provides normal elastic support for the protective cover 130, and the trigger element 1310 is located above the trigger end of the limiting element 142.

[0081] Please refer to the following: Figure 7 and Figure 8 To more clearly describe the technical solution of this embodiment, in this embodiment, the initial state position of the trigger element 1310 is defined as a non-trigger bit (e.g., Figure 7 (As shown); when the protective cover 130 is subjected to a certain impact (shock), the position at which the trigger element 1310 triggers the limit element 142 is the trigger position (as shown). Figure 8 (As shown). Thus, when the trigger element 1310 moves to the trigger position, the limit element 142 is triggered and sends a trigger signal back to the controller. The controller controls the gas generator to work according to the trigger signal. In this way, the gas generator rapidly fills the airbag with a large amount of gas, so that the airbag expands and is released instantly. The airbag quickly isolates the protective cover 130 from the colliding object, thereby protecting against further collisions caused by inertial displacement.

[0082] Optionally, the gas is a colored fluorescent gas, which will cause the airbag to burst if the impact is very large, making it easy to identify the point of impact.

[0083] In some embodiments, multiple airbag release elements 141 may be arranged on the four sides of the protective cover 130 to achieve multi-angle and multi-directional protection.

[0084] Please see Figure 8 In this embodiment, when the initial state is defined, the distance from the trigger element 1310 to the trigger end of the limiting element 142 is X, and the stroke of the compression elastic element 120 when the protective cover 130 collides is D.

[0085] The preset anti-collision force is F. 防撞力 =N*K*X, impact force is F 撞击力 = N*K*D, where K is the elastic coefficient of the elastic element 120 and N is the number of elastic elements 120. When D≥X, the limiting element 142 is triggered. Thus, the preset anti-collision force F can be adjusted by changing the number N of elastic elements 120 and the elastic coefficient K. 防撞力 Size.

[0086] Optionally, the trigger element 1310 is a wedge block, and the limit element 142 can be a limit switch. For example... Figure 8 As shown, the trigger angle of the limit switch is P, and the wedge block slope angle is Q, where P = Q.

[0087] In some embodiments, the limiting element 142 may also be a proximity switch, a Hall sensor, a laser sensor, or an infrared sensor, etc. The trigger element 1310 can be adapted and replaced. It should be understood that the above is only illustrative and is not intended to limit the scope of protection of this application.

[0088] In some embodiments, when the boom anti-collision device 100 provided in this embodiment is applied to construction machinery, when the controller receives the trigger signal fed back by the limit element 142, it can further control the construction machinery to cut off the power source input of the boom, thereby blocking the movement of the boom.

[0089] Compared to existing technologies, the boom anti-collision device provided in this embodiment can first offset part of the impact by compressing the elastic element 120 after the protective cover 130 is impacted, due to the elastic support of the elastic element 120 on the protective cover 130, thereby achieving the function of buffering and shock absorption. When the impact force is too large and exceeds the preset anti-collision force.

[0090] Furthermore, when the impact force is greater than the designed impact force F 防撞力 When the elastic support of the elastic element 120 itself cannot resist the impact force, the protective cover 130 will move further towards the mounting base 110, thereby further compressing the elastic element 120 to trigger the limiting element 142. After the limiting element 142 is triggered, the airbag release element 141 can release the protective airbag on the surface of the protective cover 130 to block the impact between the protective cover 130 and the colliding object, and at the same time block the movement of the boom. In this way, it can effectively cope with the impact caused by inertial displacement, improve the anti-collision capability, protect the equipment safety and improve the operational safety.

[0091] Example 2

[0092] Please see Figures 1 to 9 This embodiment provides an anti-collision cylinder. The anti-collision cylinder includes a boom anti-collision device 100 provided according to Embodiment 1 or Embodiment 2 above.

[0093] The anti-collision cylinder also includes a cylinder body 200 and a balance valve assembly 300 disposed on the cylinder body of the cylinder body 200. The balance valve assembly 300 includes a valve body and an oil pipe connected to the valve body.

[0094] Furthermore, the mounting base 110 of the boom anti-collision device 100 is disposed on the cylinder block, and the balance valve assembly 300 is housed in the protective space 130a. In this way, the balance valve assembly 300 is effectively protected by the boom anti-collision device 100.

[0095] Please refer to the following: Figure 10 In this embodiment, the mounting base 110 includes a base 111 and a retainer 112; the retainer 112 is detachably disposed on the base 111 and forms a constraint port between the base 111 and the base 111 that is adapted to the shape of the cylinder body, and the cylinder body is interference-fitted with the constraint port.

[0096] Furthermore, the number of mounting bases 110 can be set to multiple, with the multiple mounting bases 110 distributed along the length direction of the protective cover 130. The limiting element 142 is disposed on the holder of one of the mounting bases 110.

[0097] In some embodiments, at least one mounting base 110 has a locking slot 1120 on its mounting base 112 for engaging an anti-rotation block, and the corresponding cylinder body has an anti-rotation block. Thus, the cooperation between the base 111 and the mounting base 112 restricts the rotation of the boom anti-collision device 100 relative to the cylinder body, improving stability after installation and ensuring protective effectiveness.

[0098] Optionally, the detachable connection between the card holder 112 and the base 111 can be achieved by riveting, screwing, or bolting.

[0099] It is understood that the base 111 and the retaining seat 112 in the mounting base 110 are detachably connected, which facilitates the installation of the mounting base 111 on the cylinder block and the adjustment of its position. Of course, in some embodiments, the mounting base 110 may be a clamp-like structure.

[0100] Example 3

[0101] Please see Figures 1 to 10 This embodiment provides an engineering machinery, which includes the boom anti-collision device 100 provided in Embodiment 1 above, and / or the anti-collision cylinder provided in Embodiment 2 above.

[0102] Among them, engineering machinery can be selected from pump trucks, aerial work platforms, or fire ladders, etc.

[0103] It should be noted that, in this application, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0104] The structures of the hydraulic cylinder, balance valve, and gas generator are well known to those skilled in the art and are not part of the core improvements of this application, so they will not be described in detail here.

[0105] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0106] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A boom anti-collision device, characterized in that, include: Mounting base (110) for mounting on the boom; An elastic element (120) is disposed on the mounting base (110); The protective cover (130) is elastically supported on the mounting base (110) by the elastic element (120), and a protective space (130a) is formed between the protective cover (130) and the mounting base (110). The protective cover (130) is provided with an airbag release element (141), and the airbag release element (141) has a protective airbag to be released. A limiting element (142) is arranged within the protective space (130a), the limiting element (142) being used to control the release of the protective airbag and / or block the movement of the boom when triggered; The protective cover (130) is used to compress the elastic element (120) and trigger the limiting element (142) when the impact force is greater than the preset anti-collision force.

2. The boom anti-collision device according to claim 1, characterized in that, The protective cover (130) is provided with a trigger element (1310) for triggering the limiting element (142). In the initial state, the trigger element (1310) is located above the trigger end of the limiting element (142). The triggering element (1310) and the limiting element (142) are either impact-triggered or induction-triggered.

3. The boom anti-collision device according to claim 2, characterized in that, When the initial state is defined, the distance from the trigger element (1310) to the trigger end of the limiting element (142) is X, and the stroke of the protective cover (130) compressing the elastic element (120) when it collides is D; Wherein, the preset anti-collision force is F 防撞力 = N * K * X, the impact force is F 撞击力 = N * K * D, when D ≥ X, the limiting element (142) is triggered, wherein K is the elastic coefficient of the elastic element (120), and N is the number of the elastic element (120).

4. The boom anti-collision device according to claim 1, characterized in that, Both the airbag release element (141) and the limiting element (142) are communicatively connected to a controller. The controller is used to receive a trigger signal from the limiting element (142) and control the airbag release element (141) to release the protective airbag according to the trigger signal, and / or to block the movement of the boom according to the trigger signal.

5. The boom anti-collision device according to any one of claims 1-4, characterized in that, The limiting element (142) is a limit switch, and the protective cover (130) is provided with a triggering element (1310) for triggering the limit switch. The triggering element (1310) is a wedge block. Wherein, the trigger angle of the limit switch is P, the slope angle of the wedge block is Q, and P = Q.

6. The boom anti-collision device according to claim 1, characterized in that, The elastic element (120) includes: Guide member (121) is disposed on the mounting base (110); and An elastic buffer (122) is disposed on the guide (121) for supporting the protective cover (130).

7. The boom anti-collision device according to claim 1, characterized in that, The protective cover (130) has a reinforcing rib (1312) on the inner wall near the protective space (130a). The reinforcing rib (1312) is adapted to the shape of the inner wall and extends along the width direction of the inner wall.

8. The boom anti-collision device according to claim 1, characterized in that, The protective cover (130) includes at least one cover body (131), and the cover body (131) is provided with heat dissipation holes (1313).

9. A hydraulic cylinder for preventing collisions with a boom, characterized in that, include: Hydraulic cylinder body (200); A balance valve assembly (300) is disposed on the cylinder body of the cylinder body (200); and According to any one of claims 1-8, the boom anti-collision device (100) is provided on the cylinder body, and the balance valve assembly (300) is housed in the protective space (130a).

10. The anti-collision cylinder for a boom according to claim 9, characterized in that, The mounting base (110) includes: Base (111); The card holder (112) is detachably disposed on the base (111) and forms a constraint opening between the base (111) and the cylinder body that is adapted to the shape of the cylinder body; The cylinder body is interference-fitted with the constraint port; or, the cylinder body is provided with an anti-rotation block, and the card holder (112) is provided with a card slot (1120) for inserting the anti-rotation block.

11. An engineering machinery, characterized in that, Includes a boom anti-collision device (100) according to any one of claims 1-8, and / or a boom anti-collision cylinder according to any one of claims 9-10.

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