Elastic telescopic compensation type rotary joint and fire fighting truck

Abstract

The utility model discloses an elastic telescopic compensation type rotary joint and a fire fighting truck, which comprise an outer ring fixing base, an outer ring fixing cover plate and an inner ring fixing cover plate, the middle ring spherical surface rotating joint is mounted in the outer ring fixing base in a spherical surface fit manner and is limited by the outer ring fixing cover plate, and the middle ring spherical surface rotating joint can rotate in the outer ring fixing base and the outer ring fixing cover plate; and the inner ring rotating joint is installed in the middle ring spherical surface rotating joint in a sliding mode, an elastic telescopic assembly is installed between the inner ring rotating joint and the middle ring spherical surface rotating joint, and the elastic telescopic assembly comprises a spring and is used for compensating axial size deviation. According to the utility model, the elastic telescopic assembly is arranged and can elastically stretch out and draw back in the axial direction under the action of spring force, so that axial dimensional deviation caused by pipeline blanking, welding, assembling and the like is effectively compensated; spherical fit is adopted, so that the problems of clamping stagnation, water leakage and the like caused by internal abrasion of the rotary joint due to overlarge parallelism error of a mounting surface are effectively solved.

Description

Technical Field

[0001] The utility model relates to an elastic telescopic compensation type rotary joint and a fire truck, belonging to the field of fire truck equipment. Background Art

[0002] An elevating fire truck usually installs a turntable on the upper part of the subframe, and a lifting boom is fixed on the upper part of the turntable. The continuous rotation of the turntable drives the lifting boom to move to the best fire extinguishing posture. The fire fighting pipeline is an important part of the elevating fire truck and is the conveying channel for fire extinguishing agents such as high-pressure water, fire extinguishing foam liquid, and dry powder. This pipeline passes through the subframe, turntable, boom to the fire cannon from bottom to top. To achieve the synchronous rotation of the upper vehicle fire fighting pipeline and the boom system, a rotary joint is set at the connection of the upper and lower vehicle fire fighting pipelines. The joint base is fixed to the subframe, and the internal rotary joint and pipeline are fixed on the turntable through pipeline supports, so as to realize the synchronous rotation of the upper vehicle fire fighting pipeline and the turntable around the rotation axis. As Figure 1 shown, since the rotary joint A is installed on the rotary body installation surface C of the subframe B, and the turntable is installed on the turntable installation surface D of the subframe B, there is a parallelism error between the two installation surfaces during the manufacturing process. When the turntable drives the water pipe rotary body to rotate around the rotation axis, the rotary joint A will bear a lateral force deviating from the rotation axis, causing the rotary body to deflect a certain angle radially.

[0003] The existing rotary joint A is cylindrical, and its structure is as Figure 2 shown, mainly including a rotary joint inner ring 1, a rotary joint outer ring 2, and a fixed seat 9. Steel balls 4 are filled between the rotary joint inner and outer rings and fastened by set screws 3. A sliding sleeve 5 is installed between the rotary joint inner and outer rings, and at the same time, the two are sealed by a Y-shaped sealing ring 8. A wire retaining ring 7 is arranged between the rotary joint outer ring 2 and the fixed seat 9, and the rotary joint outer ring 2 and the fixed seat 9 are sealed by an O-shaped sealing ring 6.

[0004] Due to the flatness error between the rotary body installation surface C and the turntable installation surface D, the axis of the above existing cylindrical rotary joint does not coincide with the axis of the fixed seat 9, and the clearance fit between the cylindrical rotary joint and the rotary joint mating sleeve and the fixed seat 9 fails. During the rotation of the turntable, the rotary joint inner ring 1 and the rotary joint mating sleeve interfere with and grind against the fixed seat 9, resulting in a jamming phenomenon, and the debris generated by grinding will damage the seal and cause the rotary joint to leak water. Summary of the Invention

[0005] Aiming at the problems existing in the above-mentioned prior art, the utility model provides an elastic telescopic compensation type rotary joint and a fire truck, which can effectively compensate the axial dimension error and the parallelism error of the subframe installation surface.

[0006] In order to achieve the above purpose, an elastic telescopic compensation type rotary joint adopted by the utility model includes:

[0007] The outer ring fixed base is provided with an outer ring fixed cover plate mounted thereon;

[0008] The middle ring spherical rotary joint is mounted in the outer ring fixed base by spherical fit and limited by the outer ring fixed cover plate, and the middle ring spherical rotary joint can rotate within the outer ring fixed base and the outer ring fixed cover plate;

[0009] The inner ring rotary joint is slidably mounted in the middle ring spherical rotary joint, and an elastic telescopic assembly is installed between the inner ring rotary joint and the middle ring spherical rotary joint. The elastic telescopic assembly includes a spring, and the elastic telescopic assembly is used to compensate for axial dimension deviation.

[0010] In some embodiments, the outer ring fixed base and the outer ring fixed cover plate are connected by a set of fixing bolts, and an O-ring is used for sealing between the mating surfaces of the outer ring fixed base and the outer ring fixed cover plate.

[0011] In some embodiments, the outer ring fixed base is provided with a grease injection structure for injecting grease into the middle ring spherical rotary joint, and the grease injection structure uses an oil cup.

[0012] In some embodiments, a spherical sealing ring is provided between the middle ring spherical rotary joint and the outer ring fixed base and the outer ring fixed cover plate.

[0013] In some embodiments, a self-lubricating Y-shaped sealing ring is used for sealing between the inner ring rotary joint and the middle ring spherical rotary joint, and a self-lubricating wear-resistant sliding sleeve is provided.

[0014] In some embodiments, a limiting seat for limiting the inner ring rotary joint is mounted on the top of the middle ring spherical rotary joint;

[0015] The limiting seat is mounted on the middle ring spherical rotary joint by fastening screws.

[0016] In some embodiments, a keyway structure for axial guidance and rotational limit is provided between the middle ring spherical rotary joint and the inner ring rotary joint.

[0017] In some embodiments, the keyway structure includes a guiding groove provided on the inner side of the middle ring spherical rotary joint and a key provided on the outer side of the inner ring rotary joint, and the key slides in the guiding groove.

[0018] In some embodiments, one end of the spring is connected to a spring seat, and a pressure ring is provided at the other end. The spring seat, the spring, and the pressure ring are all sleeved on the inner ring rotary joint. The spring seat is mounted on the inner side of the middle ring spherical rotary joint, and the pressure ring is axially limited by the inner ring rotary joint.

[0019] In the second aspect of the present utility model, a fire truck is provided, and the elastic telescopic compensation type rotary joint described above is mounted on the fire truck.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1) By arranging an elastic telescopic assembly between the inner ring rotary joint and the middle ring spherical rotary joint, it can elastically expand and contract axially under the action of spring force, effectively compensating for the axial dimension deviation caused by pipeline blanking, welding, assembly, etc.

[0022] 2) The middle ring spherical rotary joint is in spherical fit with the outer ring fixed base and the outer ring fixed cover plate. After receiving the radially deflected force applied by the turntable, the middle ring spherical rotary joint will automatically deflect a certain angle, making the eccentric load force zero. During the 360° rotation of the turntable, the rotary joint of the present utility model can change the deflection angle in real time according to the change of the turntable flatness, and rotate synchronously, without being affected by the flatness error of the turntable installation plane, effectively solving the problems such as jamming and water leakage caused by excessive parallelism error of the installation surface and internal wear of the rotary joint. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic installation structure diagram of a rotary joint of a prior aerial fire truck;

[0025] Figure 2 It is a schematic structure diagram of a prior rotary joint;

[0026] Figure 3 It is a schematic structure diagram of the present utility model;

[0027] Figure 4 It is a schematic diagram of the working condition of the present utility model; (a) shows no radial deflection, and (b) shows radial deflection;

[0028] Figure 5 It is a schematic installation structure diagram of the present utility model;

[0029] In the figure: A, rotary joint; B, subframe; C, rotary body installation surface; D, turntable installation surface;

[0030] 1. Inner ring of rotary joint, 2. Outer ring of rotary joint, 3. Set screw, 4. Steel ball, 5. Sliding sleeve, 6. O-ring, 7. Wire snap ring, 8. Y-ring, 9. Fixed seat, 10. Spherical seal ring II, 11. Outer ring fixed base, 12. Self-lubricating wear-resistant sliding sleeve, 13. Fixed bolt group, 14. Key, 15. Middle ring spherical rotary joint, 16. Elastic telescopic component, 17. Fastening screw, 18. Self-lubricating Y-ring I, 19. Inner ring rotary joint, 20. Limit seat, 21. Spherical seal ring I, 22. Outer ring fixed cover plate, 23. O-ring, 24. Oil cup, 25. Self-lubricating Y-ring II, 26. Spring seat, 27. Pressure ring, 28. Limit projection. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present utility model clearer and more obvious, the technical solutions of this application will be described in detail below through the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiments of this application and the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Without conflict, the technical features in the embodiments of this application and the embodiments can be combined with each other.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protected content of the present utility model.

[0033] As Figure 3 shown, an elastic telescopic compensation type rotary joint includes an outer ring fixed base 11, a middle ring spherical rotary joint 15 and an inner ring rotary joint 19. The inner parts of the outer ring fixed base 11, the middle ring spherical rotary joint 15 and the inner ring rotary joint 19 are provided with cooperating channels for installing a fire fighting pipeline to realize the synchronous rotation of the upper vehicle fire fighting pipeline and the turntable around the rotation axis.

[0034] An outer ring fixed cover plate 22 is installed on the outer ring fixed base 11.

[0035] The middle ring spherical rotary joint 15 is installed in the outer ring fixed base 11 by spherical cooperation and is limited by the outer ring fixed cover plate 22. The middle ring spherical rotary joint 15 can rotate in the outer ring fixed base 11 and the outer ring fixed cover plate 22.

[0036] The inner ring rotary joint 19 is slidably mounted within the middle ring spherical rotary joint 15. An elastic telescopic assembly 16 is installed between the inner ring rotary joint 19 and the middle ring spherical rotary joint 15. The elastic telescopic assembly 16 includes a spring. When there is a positive deviation in the pipeline cooperating with the inner ring rotary joint 19, the elastic telescopic assembly 16 bears a compressive force, and the inner ring rotary joint 19 is pressed downward to compensate for the pipeline size deviation.

[0037] In some embodiments, as Figure 3 shown, the outer ring fixed base 11 and the outer ring fixed cover plate 22 are connected by a set of fixing bolts 13, such as bolts and nuts. An O-ring 23 is used for sealing between the mating surfaces of the outer ring fixed base 11 and the outer ring fixed cover plate 22. The overall structure has good sealing performance and is convenient for disassembly and assembly.

[0038] In some embodiments, as Figure 3 shown, an oil injection structure for injecting grease into the middle ring spherical rotary joint 15 is provided on the outer ring fixed base 11. The oil injection structure uses an oil cup 24 to inject grease to lubricate the middle ring spherical rotary joint 15, ensuring the sensitive rotation of the middle ring spherical rotary joint 15 within the outer ring fixed base 11 and the outer ring fixed cover plate 22.

[0039] In some embodiments, as Figure 3 shown, a spherical sealing ring II 10 is installed between the lower end of the middle ring spherical rotary joint 15 and the outer ring fixed base 11, and a spherical sealing ring I 21 is provided between the middle ring spherical rotary joint 15 and the outer ring fixed cover plate 22. The sealing performance between the middle ring spherical rotary joint 15 and the outer ring fixed base 11 and the outer ring fixed cover plate 22 is improved by the spherical sealing rings.

[0040] In some embodiments, as Figure 3 shown, the upper end between the inner ring rotary joint 19 and the middle ring spherical rotary joint 15 is sealed by a self-lubricating Y-shaped sealing ring I 18, and the lower end between the inner ring rotary joint 19 and the middle ring spherical rotary joint 15 is sealed by a self-lubricating Y-shaped sealing ring II 25. A self-lubricating and wear-resistant sliding sleeve 12 is also provided between the inner ring rotary joint 19 and the middle ring spherical rotary joint 15 to ensure the smooth up and down sliding of the inner ring rotary joint 19.

[0041] In some embodiments, as Figure 3 shown, a limit seat 20 for limiting the inner ring rotary joint 19 is installed at the top of the middle ring spherical rotary joint 15. The limit seat 20 is installed on the middle ring spherical rotary joint 15 through fastening screws 17, and the disassembly and assembly are convenient.

[0042] In some embodiments, as Figure 3As shown, a keyway structure is provided between the middle ring spherical swivel joint 15 and the inner ring swivel joint 19. The keyway structure includes a guiding groove provided on the inner side of the middle ring spherical swivel joint 15 and a key 14 provided on the outer side of the inner ring swivel joint 19. The key 14 fits and slides in the guiding groove, playing a dual role of axial guiding and rotational limiting for the inner ring swivel joint 19.

[0043] In some embodiments, as Figure 3 shown, one end of the spring is connected to the spring seat 26, and a pressing ring 27 is provided at the other end. The spring seat 26, the spring, and the pressing ring 27 are all sleeved on the inner ring swivel joint 19. The spring seat 26 is installed on the inner side of the middle ring spherical swivel joint 15. The pressing ring 27 is axially limited by a limiting protrusion 28 provided on the inner ring swivel joint 19. Through the spring, an axial elastic force can be provided for the inner ring swivel joint 19, effectively compensating for the axial dimension deviation caused by pipeline blanking, welding, assembly, etc.

[0044] In the second aspect of the present utility model, a fire truck is provided, and the elastic telescopic compensation type swivel joint described above is installed on the fire truck, preferably an elevating fire truck.

[0045] Theoretically, the center line of the subframe rotation, the axis of the rotating body, and the axis of the turntable rotation should coincide. However, in the actual processing and manufacturing process, there is a certain deflection between the center line of the subframe rotation and the axis of the turntable rotation. When using the elastic telescopic compensation type swivel joint of the present utility model, by adjusting the angle between the axis of the middle ring spherical swivel joint 15 and the axis of the outer ring fixed base 11, it can be ensured that the axis of the outer ring fixed base coincides with the axis of the subframe rotation, and the axis of the inner ring swivel joint coincides with the axis of the turntable rotation, effectively compensating for the parallelism error between the installation surface of the subframe turntable and the installation surface of the rotating body. The structural schematic is as Figure 4 、 Figure 5 shown.

[0046] By providing an elastic telescopic component between the inner ring swivel joint and the middle ring spherical swivel joint in the present utility model, it can elastically expand and contract axially under the action of the spring force, effectively compensating for the axial dimension deviation caused by pipeline blanking, welding, assembly, etc.; the middle ring spherical swivel joint and the outer ring fixed base and the outer ring fixed cover plate are in spherical fit. After receiving the force deflected radially applied by the turntable, the middle ring spherical swivel joint will automatically deflect a certain angle, making the eccentric load force zero. During the 360° rotation of the turntable, the swivel joint of the present utility model can change the deflection angle in real time according to the change of the flatness of the turntable, synchronously rotate, and is not affected by the flatness error of the turntable installation plane, effectively solving problems such as jamming and water leakage caused by excessive wear inside the swivel joint due to the excessive parallelism error of the installation surface.

[0047] The above are only embodiments of the present utility model, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations, improvements or equivalent replacements can be made, and they should all be covered within the scope of the claims of the present utility model. The scope of protection required by this application should be based on the content of its claims, and the specific implementation manners and the like can be used to explain the content of the claims.

Claims

1. An elastic telescopic compensation type rotary joint, characterized in that, Comprising: An outer ring fixed base (11) with an outer ring fixed cover plate (22) mounted thereon; A middle ring spherical rotary joint (15) which is mounted in the outer ring fixed base (11) by means of spherical mating and is limited by the outer ring fixed cover plate (22), and the middle ring spherical rotary joint (15) can rotate within the outer ring fixed base (11) and the outer ring fixed cover plate (22); An inner ring rotary joint (19) which is slidably mounted within the middle ring spherical rotary joint (15), and an elastic telescopic component (16) is mounted between the inner ring rotary joint (19) and the middle ring spherical rotary joint (15), the elastic telescopic component (16) includes a spring, and the elastic telescopic component (16) is used to compensate for axial dimension deviation.

2. The elastic telescopic compensation type rotary joint according to claim 1, characterized in that, The outer ring fixed base (11) and the outer ring fixed cover plate (22) are connected by a set of fixing bolts (13), and an O-ring (23) is used for sealing between the mating surfaces of the outer ring fixed base (11) and the outer ring fixed cover plate (22).

3. The elastic telescopic compensation type rotary joint according to claim 1, characterized in that, The outer ring fixed base (11) is provided with a grease injection structure for injecting grease into the middle ring spherical rotary joint (15), and the grease injection structure uses an oil cup (24).

4. The elastic telescopic compensation type rotary joint according to claim 1, characterized in that, A spherical sealing ring is provided between the middle ring spherical rotary joint (15) and the outer ring fixed base (11) and the outer ring fixed cover plate (22).

5. The elastic telescopic compensation type rotary joint according to claim 1, wherein The inner ring rotary joint (19) and the middle ring spherical rotary joint (15) are sealed with a self-lubricating Y-shaped sealing ring, and a self-lubricating wear-resistant sliding sleeve (12) is provided.

6. The elastic telescopic compensation type rotary joint according to claim 1, wherein A limit seat (20) for limiting the inner ring rotary joint (19) is mounted on the top of the middle ring spherical rotary joint (15); The limit seat (20) is mounted on the middle ring spherical rotary joint (15) by fastening screws (17).

7. An elastic telescopic compensation type rotary joint according to claim 1, characterized in that, A keyway structure for axial guiding and rotational limiting is provided between the middle ring spherical rotary joint (15) and the inner ring rotary joint (19).

8. The elastic telescopic compensation type rotary joint according to claim 7, characterized in that, The keyway structure includes a guiding groove provided on the inner side of the middle ring spherical rotary joint (15) and a key (14) provided on the outer side of the inner ring rotary joint (19), and the key (14) slides in cooperation within the guiding groove.

9. The elastic telescopic compensation type rotary joint according to claim 1, wherein One end of the spring is connected to a spring seat (26), and the other end is provided with a pressure ring (27). The spring seat (26), the spring and the pressure ring (27) are all sleeved on the inner ring rotary joint (19). The spring seat (26) is mounted on the inner side of the middle ring spherical rotary joint (15), and the pressure ring (27) is axially limited by the inner ring rotary joint (19).

10. A fire truck, characterized in that, The fire truck is equipped with the elastic telescopic compensation type rotary joint according to any one of claims 1-9.

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