WO2012075794A1

WO2012075794A1 - Center rotating coupling for engineer machinery

Info

Publication number: WO2012075794A1
Application number: PCT/CN2011/075535
Authority: WO
Inventors: 熊炳榕
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2010-12-06
Filing date: 2011-06-09
Publication date: 2012-06-14
Also published as: CN102042450A; CN102042450B

Abstract

A center rotating coupling for engineer machinery comprises a stationary assembly (1), a first rotating assembly (2), a second rotating assembly (3) and a ring baffle (4). A first channel (5) is provided in the stationary assembly (1), and a second channel (6) is provided in the second rotating assembly (3). The lower end of the second rotating assembly (3) is inserted into the first channel (5), so that the second channel (6) is connected with the first channel (5). A first seal (7) is established between the stationary assembly (1) and the second rotating assembly (3). The stationary assembly (1) is ringed by the first rotating assembly (2). The upper end of the stationary assembly (1) is extended towards the baffle (4). The second rotating assembly (3) is independent from the baffle (4). Using this center rotating coupling, the leak of the first seal (7) can be found easily, and the first seal (7) can be replaced timely.

Description

Central swivel joint for construction machinery

Technical field

The present invention relates to the field of construction machinery, and in particular to a center rotary joint for a construction machine. Background technique

Many construction machinery (such as fire trucks, pump trucks or cranes) have tops and chassis. At work, the chassis does not move, while the tops require 360-degree rotation. Most of the hydraulic oil power source, power supply and fire-fighting water pump are installed on the chassis. In order to ensure that the chassis can smoothly supply the hydraulic oil, electricity and water at any turning angle, the general engineering machinery adopts the center rotation. The joint connects the top and the chassis to supply hydraulic oil, electricity and water upwards through the center swivel joint.

Figure 1 shows a central swivel joint for a fire truck, the center swivel joint comprising a fixed body 1, a first revolving body 2, a second revolving body 3 and an annular baffle 4, the fixed body 1 having a a passage 5, the second rotor 3 has a second passage 6 therein, and a lower end of the second rotor 3 is inserted into the first passage 5 to connect the second passage 6 with the first passage 5 a first sealing member 7 is disposed between the fixed body 1 and the second rotating body 3, the first rotating body 2 is disposed around the fixed body 1 and is in the first rotating body 2 and the A space 9 is formed between the fixed bodies 1 , and the space 9 may be provided with an electrical component 8 . The baffle 4 is disposed around the second rotating body 3 and is formed integrally with the second rotating body 3 . The outer side of the baffle 4 is fixedly connected to the first revolving body 2.

When the above-described center swivel joint is mounted to the fire truck, the fixed body 1 is mounted on the chassis, and the first revolving body 2, the second revolving body 3, and the baffle 4 are coupled to the upper body. When the top loading is rotated, the first revolving body 2, the second revolving body 3 together with the baffle 4 are rotated together with the upper body, and the fire truck flows through the first passage 5 and the second passage 6 in the direction indicated by the arrow A. At this time, the second rotor 3 A relative movement is made between the fixed body 1 and the first seal 7 seals the water to prevent water from leaking onto the electrical component 8. The central swivel joint of the structure has the following two disadvantages: 1) due to the relative movement between the second revolving body 3 and the fixed body 1, the first seal 7 is worn during long-term movement, resulting in A leak occurs at the first seal 7. Once leaked, water will flow to the electrical component 8, seriously affecting the normal use of the vehicle. 2) Since the baffle 4 and the second revolving body 3 are integrally formed, when the first sealing member 7 leaks, water cannot flow out from the inside of the central swivel joint, but directly leaks inside the center swivel joint, so that it is difficult to find the first The leakage of a sealing member 7 does not allow the first sealing member 7 to be replaced in time. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a center swivel joint for a construction machine with which the leakage of the first seal can be easily found, thereby replacing the first seal in time.

In order to achieve the above object, the present invention provides a center swivel joint for a construction machine, the center swivel joint including a fixed body, a first rotating body, a second rotating body and an annular baffle, the fixed body having a first passage The second rotating body has a second passage, and a lower end of the second rotating body is inserted into the first passage to connect the second passage with the first passage, the fixed body and the second A first sealing member is disposed between the rotating bodies, the first rotating body is disposed around the fixing body, wherein an upper end of the fixing body extends to the baffle, the second rotating body and the baffle For separate parts.

Preferably, a space is formed between the first revolving body and the fixed body, and the center swivel joint further includes an electrical component, the electrical component being located in the space.

Preferably, the baffle is fixedly connected to the second rotating body and/or the first rotating body. Preferably, an inner side of the baffle is connected to an upper end of the fixed body, an outer side of the baffle is overlapped at an upper end of the first rotating body, and the second rotating body is rotatable relative to the baffle . Preferably, the baffle is integrally formed with the fixing body.

Preferably, the inner side of the baffle is detachably fixed to the upper end of the fixed body.

Preferably, a second sealing member is disposed between the fixed body and the baffle.

Preferably, a lower surface of the baffle is formed with an annular first protrusion, an inner surface of the first protrusion is formed with a second groove, and the second seal is located in the second groove .

Preferably, the upper end of the first rotating body is formed with a shoulder, and the lower surface of the baffle is formed with an annular second protruding portion, and the second protruding portion and the shoulder cooperate with each other.

Preferably, the shoulder and the second protrusion are respectively one, and one of the shoulders is located inside one of the second protrusions.

Preferably, the shoulders are two, and the second protrusions are one, and the two shoulders are respectively located inside and outside of one of the second protrusions.

When the central swivel joint provided by the present invention is mounted on the construction machine, the fixed body is mounted on the chassis, and the first rotating body is connected with the top mounted turntable, and the second rotating body is connected with the upper infusion tube. together. When the slewing mechanism of the upper body drives the turret to rotate, the turret drives the first rotator to rotate, and at the same time, the upper infusion tube and the second rotator are rotated together, and the liquid is transported through the first passage and the second passage. At this time, a relative movement occurs between the second rotating body and the fixed body, and the first sealing member seals the conveying liquid to prevent the conveying liquid from leaking. When the first sealing member leaks due to wear, the conveying liquid leaks to the outside through the gap between the fixed body and the second rotating body, so that the leakage of the first sealing member can be easily found, and the first sealing member can be timely Replace it.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are in the In the drawing: 1 is a schematic structural view of a conventional center rotary joint for a construction machine; and FIG. 2 is a schematic structural view of a center rotary joint for a construction machine according to an embodiment of the present invention. Description of the reference numerals

1: fixed body; 2: first revolving body; 3: second revolving body; 4: baffle; 5: first passage; 6: second passage; 7: first seal; 8: electrical component; Space; 10: shoulder; 11: second seal; 12: first projection; 13: second projection. detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

In the present invention, the orientation words such as "upper end", "lower end", "lower surface", "inside", "inner surface", and "outside" are used in the present invention without the contrary. The central swivel joint for construction machinery is defined in the case of installation on the construction machine, ie the direction of the drawing in Figure 2.

As shown in FIG. 2, an embodiment of the present invention provides a center swivel joint for a construction machine, which includes a fixed body 1, a first rotating body 2, a second rotating body 3, and an annular baffle 4. The fixed body 1 has a first passage 5 therein, and the second rotating body 3 has a second passage 6 therein, and the lower end of the second rotating body 3 is inserted into the first passage 5 to make the second passage a first sealing member 7 is disposed between the fixed body 1 and the second rotating body 3, and the first rotating body 2 is disposed around the fixed body 1, wherein The upper end of the fixed body 1 extends to the baffle 4, and the second revolving body 3 and the baffle 4 are separate members. When the center rotary joint provided by the present invention is mounted on the construction machine, the fixed body 1 is mounted on the chassis, and the first rotary body 2 is connected with the upper rotary table, and the second rotary body 3 and the upper infusion are connected. The tubes are connected together. When the rotary mechanism of the upper body drives the rotary table to rotate, the rotary table drives the first rotary body 2 to rotate, and also drives the upper infusion tube and the second rotary body 3 to perform a rotary motion, and the liquid is conveyed in the direction indicated by the arrow A. One channel 5 and two channel 6. At this time, a relative movement occurs between the second rotating body 3 and the fixed body 1, and the first sealing member 7 seals the conveying liquid to prevent the conveying liquid from leaking. When the first sealing member 7 leaks due to wear, the conveying liquid leaks to the outside through the gap between the fixed body 1 and the second rotating body 3, so that the leakage of the first sealing member 7 can be easily found, in time The first seal 7 is replaced.

Generally, a space 9 is formed between the first rotating body 2 and the fixed body 1, and various components can be arranged in the space 9 as needed, for example, the center rotary joint for engineering machinery provided by the present invention An electrical component 8 can also be included, which is located in the space 9. The electrical component 8 can be a conventional electrical slip ring.

According to an embodiment of the invention, the baffle 4 is fixedly connected to the second revolving body 3 and/or the first revolving body 2. Thus, when the center swivel joint provided by the present invention is in operation, the baffle 4 rotates with the second swivel body 3 and/or the first swivel body 2. The baffle 4 can be fixedly coupled to the second revolving body 3 and/or the first revolving body 2 by various suitable means known in the art, such as by fasteners (screws or bolts).

According to another embodiment of the present invention, the inner side of the baffle 4 is connected to the upper end of the fixed body 1, and the outer side of the baffle 4 is overlapped at the upper end of the first rotating body 2, The two-swing body 3 is rotatable relative to the baffle 4. Thus, when the center swivel joint provided by the present invention is in operation, the baffle 4 and the fixed body 1 are fixed, and the first revolving body 2 and the second revolving body 3 can be opposite to the baffle 4 and the fixed body 1 rotates.

The inner side of the baffle 4 can be connected to the upper end of the fixed body 1 by various suitable means. An embodiment of a center swivel joint for a construction machine according to the present invention, The baffle 4 is integrally formed with the fixed body 1. Thus, even if the first seal member 7 leaks, the transport liquid does not flow into the space 9, so that the components disposed in the space 9, such as the electric component 8, can be effectively protected.

According to another embodiment of the center swivel joint for a construction machine provided by the present invention, the inner side of the baffle 4 is detachably fixed to the upper end of the fixed body 1. This makes it easy to assemble. The inner side of the baffle 4 can be detachably fixed to the upper end of the fixed body 1 by various suitable means, for example, the inner side of the baffle 4 can be fixed with the fastener (such as a bolt or a screw). The upper end of the body 1 is connected or snap-connected to the upper end of the fixed body 1.

According to a preferred embodiment of the present invention, a second seal 11 is disposed between the fixed body 1 and the baffle 4. The provision of the second sealing member 11 can bring the following two advantages: 1) at the emergency fire fighting site or at the construction site, when the conveying liquid leaks at the first sealing member 7, the second sealing member 11 can ensure that the conveying liquid does not leak. Go to the electrical component 8 to ensure the smooth operation of the fire fighting work or construction work. 2) Since there is no relative movement between the fixed body 1 and the baffle 4, the service life of the second seal member 11 can be prolonged, and the sealing reliability can be improved. Further, only when the first sealing member 7 leaks, the second sealing member 11 is eroded by the conveying liquid, so that the second sealing member 11 is not eroded by the conveying liquid for most of the time, so that the sealing reliability can be further improved.

The second sealing member 11 may be disposed at any position between the fixed body 1 and the baffle 4, for example, between the end surface of the fixed body 1 and the end surface of the baffle 4. In order to facilitate the arrangement of the second sealing member 11, preferably, the lower surface of the baffle 4 is formed with an annular first projection 12, and the inner surface of the first projection 12 is formed with a second recess (not Displayed, the second seal 11 is located in the second recess. As shown in Fig. 2, the second seal member 11 is located between the first projecting portion 12 and the outer peripheral surface of the fixed body 1, thereby effectively preventing the liquid from being leaked into the space 9.

The second seal 11 can be various seals known in the art, such as rubber seals, polyurethane seals, engineering plastic seals or various seal packings. A first sealing member 7 is disposed between the fixed body 1 and the second rotating body 3. In order to facilitate the arrangement of the first sealing member 7, preferably, the inner surface of the fixed body 1 is provided with a first recess (not shown), and the first sealing member 7 is located in the first recess. The first seal 7 can be various seals known in the art, such as rubber seals, polyurethane seals, engineering plastic seals or various seal packings.

The outer side of the baffle 4 is overlapped at the upper end of the first revolving body 2 to prevent rain or dust from entering the interior of the center swivel joint. In order to prevent rainwater or dust from entering the inside of the center swivel joint more effectively, as shown in FIG. 2, preferably, the upper end of the first revolving body 2 is formed with a shoulder 10, and the lower surface of the baffle 4 is formed with a ring shape. The second protruding portion 13 and the second protruding portion 13 and the shoulder 10 cooperate with each other. There is no particular limitation on the number of the shoulders 10 and the second projections 13. When the shoulder 10 and the second projection 13 are respectively one, the shoulder 10 may be located inside or outside the projection 13. According to a preferred embodiment of the central swivel joint for a construction machine according to the present invention, the shoulder 10 and the second projection 13 are respectively one, and one of the shoulders 10 is located at one of the second The inner side of the projection 13. According to another preferred embodiment of the central swivel joint for a construction machine according to the present invention, the shoulders 10 are two, and the second projections 13 are one, and the two shoulders 10 are respectively located. The inner side and the outer side of one of the second projections 13. Of course, alternatively, a shoulder 10 and two second projections 13 may be provided, and a shoulder 10 is located between the two second projections 13.

The fixed body 1 and the first rotating body 2 are generally irregularly cylindrical. A hydraulic oil passage (not shown) may be provided on the fixed body 1 and the first rotary body 2 to supply the hydraulic oil upward. The second body of revolution 3 is generally tubular to be connected to the infusion tube. The baffle 4 is generally circular in shape. The first passage 5 and the second passage 6 are formed along the axial direction of the fixed body 1 and the second rotating body 3, respectively. The first passage 5 and the second passage 6 are used for conveying water for fire trucks, concrete slurry for pump trucks, or other fluids for construction machinery.

When the center swivel joint provided by the specific embodiment of the present invention is mounted on a construction machine, The fixed body 1 is mounted on the chassis, and the first rotating body 2 is coupled to the upper rotating table, and the second rotating body 3 is coupled to the upper infusion tube. When the rotary mechanism of the upper body drives the rotary table to rotate, the rotary table drives the first rotary body 2 to rotate, and also drives the upper infusion tube and the second rotary body 3 to perform a rotary motion, and the liquid is conveyed in the direction indicated by the arrow A. One channel 5 and two channel 6.

The center swivel joint for construction machinery provided by the specific embodiments of the present invention has the following advantages:

1) Since the upper end of the fixed body 1 extends to the baffle 4, the second revolving body 3 and the baffle 4 are separate members, so when the first seal 7 leaks due to wear The conveying liquid leaks to the outside through the gap between the fixed body 1 and the second rotating body 3, so that the leakage of the first sealing member 7 can be easily found, and the first sealing member 7 can be replaced in time, so that The electrical component 8 in the space 9 causes damage.

2) When the baffle 4 is formed integrally with the fixed body 1, even if the first seal 7 leaks, the transport liquid does not flow into the space 9, so that the components arranged in the space 9 can be effectively protected For example, electrical component 8.

3) When the inner side of the baffle 4 is detachably fixed to the upper end of the fixed body 1, since the second sealing member 11 is provided, when the liquid is delivered in the first seal at the emergency fire fighting site or the emergency construction site When a leak occurs at the portion 7, the second sealing member 11 can ensure that the transported liquid does not leak onto the electrical component 8, thereby ensuring smooth operation of the fire fighting work or emergency construction work.

4) Since there is no relative movement between the fixed body 1 and the baffle 4, the service life of the second sealing member 11 can be prolonged, and the sealing reliability can be improved. Further, only when the first sealing member 7 leaks, the second sealing member 11 is eroded by the conveying liquid, so that the second sealing member 11 is not eroded by the conveying liquid for most of the time, so that the sealing reliability can be further improved.

5) Since the upper end of the first rotating body 2 is formed with a shoulder 10, the outer side of the baffle 4 is formed with a second protruding portion 13, and the second protruding portion 13 and the shoulder 10 cooperate with each other. Therefore, it is possible to more effectively prevent rain or dust from entering the inside of the center swivel joint. The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction.

In addition, any combination of various embodiments of the invention may be made without departing from the spirit and scope of the invention.

Claims

Rights request

A central swivel joint for a construction machine, the central swivel joint comprising a fixed body (1), a first rotating body (2), a second rotating body (3) and an annular baffle (4), The fixed body (1) has a first passage (5) therein, the second rotating body (3) has a second passage (6), and the lower end of the second rotating body (3) is inserted into the first passage ( 5) communicating the second passage (6) with the first passage (5), and providing a first seal (7) between the fixed body (1) and the second rotating body (3) The first rotating body (2) is disposed around the fixing body (1), characterized in that an upper end of the fixing body (1) extends to the baffle (4), the second rotating body (3) and the baffle (4) are separate components.

The center swivel joint according to claim 1, wherein a space (9) is formed between the first revolving body (2) and the fixed body (1), the center swivel joint further including an electric component

(8), the electrical component (8) is located in the space (9).

The center swivel joint according to claim 1 or 2, wherein the baffle (4) is fixedly coupled to the second revolving body (3) and/or the first revolving body (2).

The center swivel joint according to claim 1 or 2, wherein an inner side of the baffle (4) is connected to an upper end of the fixed body (1), and an outer side of the baffle (4) is overlapped The upper end of the first rotating body (2), the second rotating body (3) is rotatable relative to the baffle (4).

The center swivel joint according to claim 4, wherein the baffle (4) is integrally formed with the fixed body (1).

6. The center swivel joint according to claim 4, wherein the inner side of the baffle (4) Removably fixed to the upper end of the fixed body (1).

The center swivel joint according to claim 6, wherein a second seal member (11) is disposed between the fixed body (1) and the baffle plate (4).

8. The center swivel joint according to claim 7, wherein a lower surface of the baffle (4) is formed with an annular first projection (12), an inner surface of the first projection (12) A second recess is formed, and the second seal (11) is located in the second recess.

9. The center swivel joint according to claim 4, wherein an upper end of the first revolving body (2) is formed with a shoulder (10), and a lower surface of the baffle (4) is formed with a second ring shape Protrusion

(13), the second protrusion (13) and the shoulder (10) cooperate with each other.

10. The center swivel joint according to claim 9, wherein the shoulder (10) and the second projection (13) are respectively one, and one of the shoulders (10) is located in one of the The inner side of the two projections (13).

11. The center swivel joint according to claim 9, wherein the shoulders (10) are two, the second protrusions (13) are one, and the two shoulders (10) are respectively located. One said