A telescopic main arm

Abstract

The utility model discloses a telescopic main arm, which is arranged vertically and comprises a plurality of vertical supporting bodies, wherein adjacent supporting bodies are slidably connected, and a supporting structure for keeping the supporting bodies vertical is arranged on the outer supporting bodies, wherein the supporting structure is a side leg. When working, the outer supporting body directly acts on the ground and is supported by four side legs. Since the main arm does not rotate or move when working, the stability of the main arm can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a telescopic main arm. Background Art

[0002] Fire trucks are a common firefighting and rescue equipment used for high-altitude firefighting and rescue. At present, the main arms of fire trucks are tilted and retracted when they are working. If the main arm is extended too long, the center of gravity of the main arm will deviate from the support position, the fire truck will be unstable when working, and the fire truck will be at risk of overturning. Therefore, this limits the height of firefighting and rescue, and the rescue points are also restricted. In addition, since the existing fire trucks are all equipped with a slewing support on the chassis, the inclined main arm base is connected to the chassis of the fire truck by the slewing support, and the main arm is cantilevered, the main arm needs to rotate or change the tilt angle when working, so it is impossible to add auxiliary support. Since the main arm has a large inertia, the rigidity of the main arm becomes poor after it is extended too long. When rotating or changing the tilt angle, it is easy to cause the main arm to shake and affect the safety of rescue. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a telescopic main arm, which is used to solve the problem that when the main arm of the existing fire truck is extended too long, the center of gravity of the main arm deviates from the supporting position, resulting in instability of the fire truck during operation.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A telescopic main arm is arranged vertically and comprises a plurality of vertical supporting bodies. Adjacent supporting bodies are slidably connected to each other, and supporting structures for keeping the supporting bodies vertical are arranged on the outer supporting bodies.

[0006] Furthermore, the support structure includes a retractable side support leg which is arranged at the lower part of one side of the outer support body and is inclined outward, wherein the upper end of the side support leg is connected to the outer support body and the lower end is supported on the support surface.

[0007] Furthermore, the upper end of the hydraulic cylinder is hinged to the outer support body, and the lower end is supported on the support surface.

[0008] Furthermore, the part where the hydraulic cylinder is connected to the outer support body is the first part, and the other part is the second part. A connecting rod is provided between the second part and the support body, and the second part and the support body are rotatably connected to the corresponding end of the connecting rod respectively.

[0009] Furthermore, the second part is also connected to a side leg auxiliary hydraulic cylinder, one end of the side leg auxiliary hydraulic cylinder is rotatably connected to the second part, and the other end is rotatably connected to the outer support body.

[0010] Furthermore, the first part is a push rod of a hydraulic cylinder, the second part is a cylinder body of a hydraulic cylinder, the hydraulic cylinders are two coaxial ones, the cylinder bodies of the two hydraulic cylinders are fixedly connected back to back, the push rod of the upper hydraulic cylinder is hinged to the outer support body, the push rod of the outer hydraulic cylinder is supported on the support surface, the cylinder body of the upper hydraulic cylinder is rotatably connected to the connecting rod, and the cylinder body of the lower hydraulic cylinder is rotatably connected to the side support leg auxiliary hydraulic cylinder.

[0011] Furthermore, a vertical main arm base hydraulic cylinder is fixedly arranged at the bottom of the outer support body. The main arm base hydraulic cylinders are several and are arranged around the support body. A bottom plate is provided at the bottom of each main arm base hydraulic cylinder. The top of the main arm base hydraulic cylinder is fixedly connected to the outer support body, and the bottom of the main arm base hydraulic cylinder is fixedly connected to the outer part of the corresponding bottom plate.

[0012] Furthermore, a connecting plate is provided at the center of the bottom of the outer support body, and the inner part of the bottom plate is connected to the connecting plate via a hinge provided between the bottom plate and the connecting plate.

[0013] Furthermore, it also includes a main arm retracting and extending hydraulic cylinder, one end of which is rotatably connected to the outer support body.

[0014] Furthermore, the support body is cylindrical, and the support bodies are nested in sequence from the outside to the inside. Each support body is driven by a main arm telescopic drive mechanism to achieve telescopic movement. The main arm telescopic drive mechanism is one of a rope telescopic mechanism, a hydraulic telescopic mechanism, and a gear rack telescopic mechanism.

[0015] The positive effects of the utility model are:

[0016] 1. The main arm is vertically arranged and includes eight mutually nested vertical supports. Adjacent supports are slidably connected, and side legs are arranged on the outer supports. When working, the outer supports act directly on the ground and are supported by four side legs. The main arm does not rotate or move when working, thereby improving the stability of the main arm. At the same time, the main arm can be raised higher. Through the cooperation of the folding arm, firefighting and rescue can be carried out on higher floors, reaching the floor height that the current fire trucks cannot reach.

[0017] 2. A main arm base hydraulic cylinder is provided at the bottom of the outer support. When the ground is uneven, the inclination sensor provided on the outer support detects the inclination angle of the support, and corrects the inclination of the support by controlling the extension length of the side legs and the extension length of the main arm base hydraulic cylinder, so that the support always remains in a vertical state. The main arm base hydraulic cylinder keeps the bottom plate in contact with the ground at all times, preventing the main arm from sinking due to load bearing, improving the stability of the main arm, and allowing the main arm to remain upright when the ground is uneven. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the utility model;

[0019] Figure 2 yes Figure 1 A top view of

[0020] Figure 3 yes Figure 1 Bottom view of

[0021] Figure 4 It is a schematic diagram of the utility model after being connected with the body of a fire truck;

[0022] Figure 5 yes Figure 1 Enlarged view of the lower part;

[0023] Figure 6 yes Figure 5 A partial enlarged view of the middle I part;

[0024] Figure 7 It is a schematic diagram of the rope row telescopic mechanism;

[0025] 1. Vehicle body; 3. Folding arm; 201. Support body; 202. Side outrigger; 203. Side outrigger auxiliary hydraulic cylinder; 204. Main arm retracting and extending hydraulic cylinder; 205 Main arm base hydraulic cylinder; 206. Bottom plate; 207. Ladder; 208. Lower mounting plate; 209. Connecting rod; 210. Upper mounting plate; 211. Connecting plate; 212. Pulley; 213. Wire rope. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figures 1 to 6 As shown, a telescopic main arm is arranged vertically, and the main arm includes eight vertical supports 201 nested in sequence from outside to inside. The supports 201 are all truss structures formed by connecting profiles to each other, and their cross sections are hexagonal. Adjacent supports 201 are all slidably connected, and the lower part of the outer supports 201 is provided with a support structure for keeping the supports 201 vertical.

[0028] The support structure includes a retractable side leg 202 which is arranged at the lower part of one side of the outer support body 201 and is inclined outward. The side legs 202 are arranged in two groups symmetrically, with two legs 202 in each group. The upper end of each side leg 202 is connected to a corresponding side of the outer support body 201, and the lower end is supported on the ground at the work site (the ground is the support surface for the on-site work).

[0029] The side legs 202 are hydraulic cylinders, the upper ends of which are hinged to the outer support bodies 201 , and the lower ends of which are supported on the ground.

[0030] The part where the hydraulic cylinder is connected to the outer support body 201 is the first part, and the other part is the second part. A connecting rod 209 is provided between the second part and the outer support body 201. The connecting rods 209 are two symmetrically arranged in an eight-shaped shape on both sides of the second part. An upper mounting plate 210 is fixedly connected to the outside of the outer support body 201. The second part and the upper mounting plate 210 are rotatably connected to the corresponding end of the connecting rod 209 respectively.

[0031] The first part is the push rod of the hydraulic cylinder, and the second part is the cylinder body of the hydraulic cylinder. Each side support leg 202 has two coaxially arranged hydraulic cylinders, and the cylinder bodies of the two hydraulic cylinders are fixedly connected back to back. The push rod of the upper hydraulic cylinder is hinged to the upper mounting plate 210, and the bottom end of the push rod of the lower hydraulic cylinder is hinged to a pressure plate, and the bottom surface of the pressure plate is supported on the ground. The cylinder body of the upper hydraulic cylinder is rotatably connected to the connecting rod 209.

[0032] The cylinder body of the lower hydraulic cylinder is also connected to a side leg auxiliary hydraulic cylinder 203, and the outer side of the outer support body 201 is fixedly connected to a lower mounting plate 208 below the upper mounting plate 208. The cylinder rod of the side leg auxiliary hydraulic cylinder 203 is hinged to the cylinder body of the lower hydraulic cylinder, and the side leg auxiliary hydraulic cylinder 203 is rotatably connected to the outer support body 201. The cylinder body of the lower hydraulic cylinder is hinged to the push rod of the side leg auxiliary hydraulic cylinder 203, and the cylinder body of the side leg auxiliary hydraulic cylinder 203 is hinged to the lower mounting plate 208.

[0033] Each support body 201 is driven to extend and retract by a main arm extension and retraction drive mechanism, and the main arm extension and retraction drive mechanism is as follows: Figure 7 The rope row telescopic mechanism shown.

[0034] exist Figure 7 In the embodiment, except for the innermost support body 201, the tops of the other support bodies 201 are all provided with pulleys 212, each pulley 212 is wound with a steel wire rope 213, the two ends of the steel wire rope 213 are respectively fixedly connected to the bottom of the adjacent support body 201, and the outermost steel wire rope 213 is pulled by the winch on the fire truck body 1. The rope row telescopic mechanism is a prior art and is commonly used in telescopic devices such as crane main arms.

[0035] The hydraulic cylinder of the side support leg 202 is retracted, and the side support leg auxiliary hydraulic cylinder 203 is retracted, so that the side support leg 202 can be retracted inwardly and close to the support body 201.

[0036] Since the support body 201 adopts an upright hexagonal structure, it has good anti-bending stability and has a better balance posture at a very high height. The main arm adopts a vertical type, and its cross-sectional geometric dimensions can be enlarged, which minimizes the slenderness ratio of the existing slender rods and improves the anti-bending performance.

[0037] When working, the bottom of the main arm acts directly on the ground and is supported by four side legs. The main arm does not rotate or move when working, thereby improving the stability of the main arm.

[0038] A foldable ladder 207 is also provided outside the outer support body 201 to facilitate personnel to enter the main arm and take the elevator inside the main arm.

[0039] Example 2

[0040] This embodiment is further improved on the basis of embodiment 1, specifically:

[0041] Vertical main arm base hydraulic cylinders 205 are provided at the six corners of the bottom of the outer support body 201, and a pentagonal bottom plate 206 is provided at the bottom of each main arm base hydraulic cylinder 205. The six bottom plates 206 are consistent with the shape of the bottom of the outer support body 201 after being assembled. The top of the main arm base hydraulic cylinder 205 is fixedly connected to the outer support body 201, and the bottom of the main arm base hydraulic cylinder 205 is fixedly connected to the outer part of the corresponding bottom plate 206.

[0042] A hexagonal connecting plate 211 is disposed at the bottom center of the outer support body 201 , and the inner portion of the bottom plate 206 is connected to the connecting plate 211 via a hinge disposed between the bottom plate 206 and the connecting plate 211 .

[0043] When the ground is uneven, the inclination sensor provided on the outer support body 201 detects the inclination angle of the support body 201, and adjusts the inclination of the support body 201 by controlling the extension length of the side legs 202 and the extension length of the main arm base hydraulic cylinder 205, so that the support body 201 always remains in a vertical state. The main arm base hydraulic cylinder 205 keeps the bottom plate 206 in contact with the ground at all times, preventing the main arm from collapsing due to the load, improving the stability of the main arm, and allowing the main arm to remain upright when the ground is uneven.

[0044] Example 3

[0045] The difference between this embodiment and embodiment 1 is that:

[0046] A main arm retracting hydraulic cylinder 204 is provided on the outer side of the outer support body 201, one end of which is hinged thereto. In actual production, the other end of the main arm retracting hydraulic cylinder 204 is hinged to the body 1 of the fire truck near the tail, and the outer side of the outer support body 201 near the bottom is hinged to the tail of the fire truck body 1. When the main arm retracting hydraulic cylinder 204 is in motion, the main arm can be retracted onto the body 1 of the fire truck or lowered from the body 1 of the fire truck. The top end of the inner support body 201 is connected to the folding arm 3 of the fire truck. The above-mentioned embodiments describe content in a relatively detailed and specific manner, and express the preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, and their purpose is to enable technicians in this field to understand the content of the present utility model and implement it accordingly, but they are not limited to the present utility model. The patent scope of the present utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made to the spirit disclosed by the present utility model, for researchers or technicians in this field, without departing from the structure of the present utility model, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present utility model.

Claims

1. A telescopic main arm, characterized in that: The main arm is arranged vertically, and comprises a plurality of vertical support bodies (201). Adjacent support bodies (201) are slidably connected to each other, and a support structure for keeping the support bodies (201) vertical is provided on the outer support bodies (201).

2. A telescopic main arm according to claim 1, characterized in that: The support structure comprises a retractable side support leg (202) arranged at the lower portion of one side of the outer support body (201) and inclined outwards, wherein the upper end of the side support leg (202) is connected to the outer support body (201) and the lower end is supported on the support surface.

3. A telescopic main arm according to claim 2, characterized in that: The side support leg (202) is a hydraulic cylinder, the upper end of which is hinged to the outer support body (201), and the lower end of which is supported on the support surface.

4. A telescopic main arm according to claim 3, characterized in that: The part of the hydraulic cylinder connected to the outer support body (201) is the first part, and the other part is the second part. A connecting rod (209) is provided between the second part and the support body (201). The second part and the support body (201) are rotatably connected to the corresponding end of the connecting rod (209).

5. The telescopic main arm according to claim 4, characterized in that: The second part is also connected to a side leg auxiliary hydraulic cylinder (203), one end of the side leg auxiliary hydraulic cylinder (203) is rotatably connected to the second part, and the other end is rotatably connected to the outer support body (201).

6. A telescopic main arm according to claim 5, characterized in that: The first part is a push rod of the hydraulic cylinder, and the second part is a cylinder body of the hydraulic cylinder. The hydraulic cylinders are two coaxial ones, and the cylinder bodies of the two hydraulic cylinders are fixedly connected back to back. The push rod of the upper hydraulic cylinder is hinged to the outer support body (201), and the push rod of the outer hydraulic cylinder is supported on the support surface. The cylinder body of the upper hydraulic cylinder is rotatably connected to the connecting rod (209), and the cylinder body of the lower hydraulic cylinder is rotatably connected to the side support leg auxiliary hydraulic cylinder (203).

7. The telescopic main arm according to claim 1, characterized in that: A vertical main arm base hydraulic cylinder (205) is fixedly arranged at the bottom of the outer support body (201), and the main arm base hydraulic cylinders (205) are arranged in a plurality along the periphery of the support body (201). A bottom plate (206) is provided at the bottom of each main arm base hydraulic cylinder (205), and the top of each main arm base hydraulic cylinder (205) is fixedly connected to the outer support body (201), and the bottom of each main arm base hydraulic cylinder (205) is fixedly connected to the outer portion of the corresponding bottom plate (206).

8. The telescopic main arm according to claim 7, characterized in that: A connecting plate (211) is provided at the bottom center of the outer support body (201), and the inner portion of the bottom plate (206) is connected to the connecting plate (211) via a hinge provided between the bottom plate (206) and the connecting plate (211).

9. The telescopic main arm according to claim 1, characterized in that: It also includes a main arm retracting and extending hydraulic cylinder (204) having one end rotatably connected to the outer support body (201).

10. The telescopic main arm according to claim 1, characterized in that: The support bodies (201) are cylindrical, and the support bodies (201) are nested in sequence from the outside to the inside. Each support body (201) is driven by a main arm telescopic drive mechanism to achieve telescopic movement. The main arm telescopic drive mechanism is one of a rope telescopic mechanism, a hydraulic telescopic mechanism, and a gear rack telescopic mechanism.

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