Rotational torque balancing device and rotational joint having the same

Abstract

The present application relates to a kind of rotating torque balancing device and rotating joint with the device, the balancing device is used to balance the torque generated when the movable part pivoted on fixed part rotates, comprising: pulley transmission part, one end of pulley transmission part is associated with movable part, the other end of pulley transmission part is associated with elastic part;When external force drives movable part to rotate relative to fixed part, movable part compresses elastic part by pulley transmission part, and elastic part generates counterforce equivalent to external force from this, to realize torque balance.The rotating joint includes pivoted fixed part and movable part, and the rotating torque balancing device described above.The rotating torque balancing device provided by the present application can have one-way balancing effect, or can have bidirectional balancing effect, while the structure is compact, the principle is simple, easy to realize, so as to have very high practicality and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of mechanical equipment, specifically about a rotating torque balancing device and the rotating joint with the device. BACKGROUND

[0002] In actual industrial application, people often encounter such a structure: one end of a certain structural member has a load, and the other end rotates around a certain shaft. During rotation, the gravity of the load will generate a torque on the rotation center. Whether the movement of the load is manual or driven by a motor, people hope to reduce the manual or motor force, which is beneficial to the convenience of use and the service life of the structure.

[0003] At present, the common rotating torque balancing mechanism on the market mostly uses torsional spring to achieve it, but torsional spring mostly only provides unidirectional balancing force, and when the torque to be balanced is large, larger structure and space are needed. SUMMARY

[0004] In view of the above problems, one of the purposes of the present application is to provide a rotating torque balancing device with high practicability and reliability; another purpose of the present application is to provide a rotating joint with the rotating torque balancing device.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a rotating torque balancing device for balancing the torque generated when the movable part pivoted on the fixed part rotates, the device comprising: an elastic part arranged on the fixed part; a pulley transmission part, one end of the pulley transmission part is associated with the movable part, and the other end of the pulley transmission part is associated with the elastic part; when an external force drives the movable part to rotate relative to the fixed part, the movable part compresses the elastic part through the pulley transmission part, and the elastic part generates a counterforce equivalent to the external force to achieve torque balance.

[0006] Preferably, the rotating torque balancing device, the rotation axis of the movable part is perpendicular to the length direction of the fixed part and the movable part at the same time.

[0007] Preferably, the rotating torque balancing device, the elastic part comprises: a mounting seat mounted on the fixed part; a sliding block slidably arranged on the mounting seat, and the sliding block is associated with the movable part through the pulley transmission part; an elastic member arranged between the mounting seat and the sliding block; when an external force drives the movable part to rotate relative to the fixed part, the movable part drives the sliding block to compress the elastic member through the pulley transmission part, and the elastic member generates a counterforce equivalent to the external force.

[0008] Preferably, the mounting base is in the form of a groove, and a guide column is arranged between two wing plates of the mounting base and penetrates through the sliding block to form a sliding pair.

[0009] Preferably, the elastic member is a set of compression springs, and one end of each of the compression springs is abutted against a wing plate of the mounting base, and the other end of each of the compression springs is abutted against the sliding block.

[0010] Preferably, the elastic member is two sets of compression springs, and one end of each of the two sets of compression springs is abutted against a wing plate of the mounting base, and the other end of each of the two sets of compression springs is abutted against a sliding plate.

[0011] Preferably, at least one limiting block is arranged on a web plate of the mounting base between the two sliding plates.

[0012] Preferably, the pulley transmission part comprises: an adapter block fixed on the movable part; a first traction rope and a second traction rope arranged on two sides of the adapter block, respectively, and one end of each of the first traction rope and the second traction rope is fixedly connected to the adapter block, the other end of the first traction rope is fixedly connected to a wing plate of the mounting base on the same side after being turned by a first pulley set, and the other end of the second traction rope is fixedly connected to a wing plate of the mounting base on the same side after being turned by a second pulley set.

[0013] Preferably, the first pulley set comprises: a first fixed pulley set rotatably arranged on a wing plate of the mounting base; and a second movable pulley set rotatably arranged on the sliding block, and the second pulley set comprises: a second fixed pulley set rotatably arranged on another wing plate of the mounting base; and a second movable pulley set rotatably arranged on the sliding block.

[0014] The rotating torque balancing device, preferably, the first fixed pulley set comprises a first fixed pulley and a second fixed pulley rotatably connected to a side wing plate of the mounting seat through two pin shafts respectively, the first movable pulley set comprises a first movable pulley and a second movable pulley rotatably connected to the sliding block through the two pin shafts respectively, and the other end of the first traction rope is connected to the side wing plate of the mounting seat after sequentially passing through the first fixed pulley, the first movable pulley, the second fixed pulley and the second movable pulley.

[0015] The rotating torque balancing device, preferably, the second fixed pulley set comprises a third fixed pulley and a fourth fixed pulley rotatably connected to the other side wing plate of the mounting seat through another two pin shafts respectively, the second movable pulley set comprises a third movable pulley and a fourth movable pulley rotatably connected to the sliding block through the same two pin shafts respectively, and the other end of the second traction rope is connected to the other side wing plate of the mounting seat after sequentially passing through the third fixed pulley, the third movable pulley, the fourth fixed pulley and the fourth movable pulley.

[0016] The rotating torque balancing device, preferably, further comprises a traction rope adjusting part, the other ends of the first traction rope and the second traction rope are fixedly connected to the mounting seat through the traction rope adjusting part, and the traction rope adjusting part is used for adjusting the positions of the first traction rope and the second traction rope, so that the sliding block is in the middle position of the guide column during balancing.

[0017] The rotating torque balancing device, preferably, the traction rope adjusting part comprises first and second studs respectively arranged on the two side wing plates of the mounting seat, and external threads are formed on the first and second studs; first and second adjusting blocks are hollow cylinders, and internal threads are formed in the first and second adjusting blocks respectively to match the external threads of the first and second studs, the first and second adjusting blocks are threadedly connected to the first and second studs respectively, and the first and second traction ropes are fixedly connected to the first and second adjusting blocks respectively.

[0018] The rotating torque balancing device, preferably, a gap is formed in the axial direction on each of the first and second adjusting blocks, the other ends of the first and second traction ropes form protruding spherical parts, the first and second traction ropes are respectively arranged in the first and second adjusting blocks through the gap, so that the spherical parts of the first and second traction ropes are respectively limited in the first and second adjusting blocks.

[0019] A rotating joint comprising a fixed part and a movable part that are pivotally connected, and the rotating torque balancing device described above.

[0020] The present application has the following advantages: 1. The rotating torque balancing device provided by the present application can have one-way balancing effect or two-way balancing effect, and has compact structure, simple principle and high practicability and reliability. 2. The segmented effect of the movable pulley makes the steel wire rope stroke several times (specifically, the number of movable pulleys on each rope multiplied by 2 times) of the compression amount of the compression spring, so that the compression spring with small compression amount can make the steel wire rope have large stroke, so that the connecting rod has large rotation angle, thus promoting the compact structure. 3. The elastic element of the present application adopts a compression spring, and the elastic coefficient of the compression spring can have a large range of values. The elastic coefficient of the compression spring on the market can be very small or very large (mold spring), and the number of compression springs can be selected, so that the balancing parameters (spring elastic coefficient and number) of the load G with different weights can be easily obtained. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a rotating joint of an embodiment of the present application;

[0022] Figure 2 is a structural schematic diagram of a rotating joint of an embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of a rotating torque balancing device of the embodiment of the present application;

[0024] Figure 4 is a connection schematic diagram of an adapter block and a steel wire rope of the embodiment of the present application;

[0025] Figure 5 is a state schematic diagram of the connecting rod counterclockwise rotation of the embodiment of the present application;

[0026] Figure 6 is a state schematic diagram of the connecting rod clockwise rotation of the embodiment of the present application;

[0027] Figure 7 is a structural schematic diagram of a spring mounting seat of the embodiment of the present application. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the purpose, characteristics and advantages of the present application can be more clearly understood. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but only to illustrate the essential spirit of the technical scheme of the present application.

[0029] As Figure 1As shown, the rotary torque balancing device provided by this invention is mainly used in a rotary joint composed of a fixed base 1 and a connecting rod 2. Specifically, the fixed base 1 is fixed relative to the connecting rod 2, one end of the connecting rod 2 is rotatably connected to the fixed base 1, and the rotation axis 20 of the connecting rod 2 is perpendicular to both the fixed base 1 and the length direction of the connecting rod 2. The other end of the connecting rod 2 has a load G (this is only an equivalent illustration). Typically, the fixed base 1 can be fixedly connected to a stationary carrier, and the connecting rod 2 can rotate relative to the fixed base 1. However, the naming of this device in this invention does not limit the fixed base 1 to being fixed to a stationary carrier, but is merely to illustrate that this invention places greater emphasis on the movement of the connecting rod 2 relative to the fixed base 1.

[0030] like Figure 2 As shown, the rotational torque balancing device includes: an elastic part, which is mounted on a fixed base 1; a pulley transmission part, one end of which is connected to a connecting rod 2, and the other end of which is connected to the elastic part; when an external force drives the connecting rod 2 to rotate relative to the fixed base 1, the connecting rod 2 compresses the elastic part through the pulley transmission part, thereby generating a reaction force equivalent to the external force to achieve torque balance.

[0031] In the above implementation examples, preferably, such as Figure 2 , Figure 3 As shown, the elastic part includes: a spring mounting base 4, which is groove-shaped and fixed on the fixed base 1; a spring pressure block 10, which is slidably disposed on the spring mounting base 4; two spring pressure plates 14, which are disposed on both sides of the spring pressure block 10; a guide post 13, which is fixed between the two wing plates of the spring mounting base 4, and the guide post 13 passes through the spring pressure block 10 and the two spring pressure plates 14 and forms a sliding pair with them; and two sets of compression springs 11, which are respectively sleeved on the guide post 13 located between the two spring pressure plates 14 and the two wing plates of the spring mounting base 4, with one end of the compression spring 11 abutting against the wing plate of the spring mounting base 4 and the other end of the compression spring 11 abutting against the spring pressure plate 14.

[0032] In the above implementation examples, preferably, such as Figure 1 , Figure 3 As shown, the pulley transmission unit includes: a transition block 3, fixed on the connecting rod 2; fixed pulley blocks 6 and 8, respectively rotatably mounted on the two wing plates of the spring mounting base 4; movable pulley blocks 7 and 9, both rotatably mounted on the spring pressure block 10; and wire ropes 5-1 and 5-2, respectively located on both sides of the transition block 3, with one end of each wire rope fixedly connected to the transition block 3, the other end of wire rope 5-1 passing through fixed pulley blocks 6 and 7 and then fixedly connected to the left wing plate of the spring mounting base 4, and the other end of wire rope 5-2 passing through fixed pulley blocks 8 and 9 and then fixedly connected to the right wing plate of the spring mounting base 4.

[0033] In the above embodiment, preferably, the fixed pulley set 6 comprises a fixed pulley 6-1 and a fixed pulley 6-2 rotatably connected to the left side wing plate of the spring mounting base 4 through two pin shafts 15 respectively, and the fixed pulley set 8 comprises a fixed pulley 8-1 and a fixed pulley 8-2 rotatably connected to the right side wing plate of the spring mounting base 4 through another two pin shafts 15 respectively.

[0034] In the above embodiment, preferably, the moving pulley set 7 comprises a moving pulley 7-1 and a moving pulley 7-2 rotatably connected to the spring pressing block 10 through two pin shafts 16 respectively, and the moving pulley set 9 comprises a moving pulley 9-1 and a moving pulley 9-2 rotatably connected to the spring pressing block 10 through the same two pin shafts 16 respectively.

[0035] Specifically, the other end of the steel wire rope 5-1 is connected to the left side wing plate of the spring mounting base 4 after passing through the fixed pulley 6-1, the moving pulley 7-1, the fixed pulley 6-2 and the moving pulley 7-2 in sequence, and the other end of the steel wire rope 5-2 is connected to the right side wing plate of the spring mounting base 4 after passing through the fixed pulley 8-1, the moving pulley 9-1, the fixed pulley 8-2 and the moving pulley 9-2 in sequence.

[0036] In the above embodiment, preferably, as shown in Figure 7 the balance device further comprises a steel wire rope adjusting part, which comprises: two studs 17-1 and 17-2 arranged on the two side wing plates of the spring mounting base 4 respectively, and each of the studs 17-1 and 17-2 is formed with external threads; two adjusting blocks 12-1 and 12-2 in the shape of hollow cylinders, and the inner parts of the adjusting blocks 12-1 and 12-2 are respectively formed with internal threads matched with the external threads of the studs 17-1 and 17-2, the adjusting blocks 12-1 and 12-2 are respectively threadedly connected to the studs 17-1 and 17-2, and the steel wire ropes 5-1 and 5-2 are respectively fixedly connected to the adjusting blocks 12-1 and 12-2. Thus, by rotating the adjusting blocks 12-1 and 12-2, they can be moved along the studs 17-1 and 17-2, and the positions of the steel wire ropes 5-1 and 5-2 can be adjusted during installation, so that the spring pressing block 10 is in the middle position of the guide column 13 during balancing, and the steel wire ropes 5-1 and 5-2 are in a taut state, and the positions of the adjusting blocks 12-1 and 12-2 remain unchanged during use.

[0037] In the above embodiment, preferably, each of the adjusting blocks 12-1 and 12-2 is formed with a gap in the axial direction, and the other ends of the steel wire ropes 5-1 and 5-2 are formed with protruding spherical parts, and the steel wire ropes 5-1 and 5-2 are respectively arranged in the adjusting blocks 12-1 and 12-2 through the gaps, so that the spherical parts of the steel wire ropes 5-1 and 5-2 are respectively limited in the adjusting blocks 12-1 and 12-2.

[0038] In the above embodiment, preferably, as shown in Figure 5 At least one limit block 18 is arranged on the web of the spring mounting seat 4 between the two spring pressing plates 14 to limit the displacement of the two spring pressing plates 14.

[0039] In the initial state (as shown in Figure 1 、 Figure 2 The center of gravity of the load G is directly above the rotation axis 20, and the gravity of the load G does not generate a torque on the rotation axis. At this time, the spring pressing block 10 is in the intermediate state, the left spring pressing plate 14 is moved to the rightmost end and is blocked by the limit block 18 on the spring mounting seat 4, the right spring pressing plate 14 is moved to the leftmost end under the action of the right compression spring 11 and is also blocked by the limit block 18 on the spring mounting seat 4, the two compression springs 11 are basically in the original length state except for a small amount of pre-tightening force, and the two compression springs 11 do not have any force on the adapter block 3 or the connecting rod 2. At this time, the entire device is in an unstable balanced state.

[0040] When the connecting rod 2 moves to the left (as shown in Figure 5 The load G generates a counterclockwise torque on the rotation axis, at this time, the steel wire rope 5-2 is moved upward under the driving of the adapter block 3, the length of the steel wire rope 5-2 wound on the adapter block 3 is increased, and then the spring pressing block 10 is driven to move to the right side through the movable pulleys 9-1 and 9-2, the spring pressing block 10 makes the right compression spring 11 in the compressed state through the right spring pressing plate 14, thereby generating a balancing force to balance the torque of the load G on the rotation axis. At the same time, the left compression spring 11 is in the original state under the limitation of the left spring pressing plate 14 (which is limited by the limit block 18 and cannot move to the right), but since the spring pressing block 10 simultaneously drives the movable pulleys 7-1 and 7-2 to move to the right, the length of the steel wire rope 5-1 wound on the adapter block 3 is reduced, and this length is exactly the same as the length required for the movable pulleys 7-1 and 7-2 to move to the right, so the steel wire rope 5-1 is always maintained in a taut state under the pulling of the movable pulleys 7-1 and 7-2. In this way, when the load G moves to the left, under the action of the balancing force, there is no sudden acceleration, and the external force required to return to the original state is also greatly reduced, achieving good assistance function.

[0041] When the connecting rod 2 moves to the right (as shown in Figure 6When the load G is applied to the rotating shaft in the clockwise direction (as shown in the figure), the load G generates a clockwise torque on the rotating shaft, at this time, the wire rope 5-1 is pulled upward by the adapter block 3, the length of the wire rope 5-1 wound on the adapter block 3 is increased, and the spring pressing block 10 is pulled to the left by the movable pulley 7-1 and the movable pulley 7-2, the left compression spring 11 is compressed by the left spring pressing plate 14, so that a balance force is generated to balance the torque of the load G on the rotating shaft. At the same time, the right compression spring 11 is in the original state under the limitation of the right spring pressing plate 14 (limited by the limiting block 18 and cannot move to the left), but because the spring pressing block 10 simultaneously pulls the movable pulley 9-1 and the movable pulley 9-2 to the right, the length of the wire rope 5-2 wound on the adapter block 3 is reduced, and this length is exactly the same as the length required for the movable pulley 9-1 and the movable pulley 9-2 to move to the right, so the wire rope 5-2 is always in a taut state under the pulling of the movable pulley 9-1 and the movable pulley 9-2. In this way, when the load G moves to the right, under the action of the balance force, there is no sudden acceleration, and the external force required to return to the original state is also greatly reduced, achieving good power assistance function.

[0042] In the above embodiment, preferably, the number of the two-side compression springs 13 can be adjusted as needed, thereby balancing the load G of different weights.

[0043] Of course, those skilled in the art can understand that in the above embodiment, the compression spring 13 can also be arranged on only one side of the spring pressing block 10, at this time, the spring pressing plate 14 can be cancelled, thereby forming a one-way power-assisted rotating torque balancing device.

[0044] Based on the rotating torque balancing device provided in the above embodiment, the application further provides a rotary joint, which comprises a pivotally connected fixed seat 1 and a connecting rod 2, and the rotating torque balancing device in the above embodiment.

[0045] The above embodiments are only used to illustrate the application, and the structure, connection mode and manufacturing process of each component can be changed, and any equivalent transformation and improvement based on the technical scheme of the application should not be excluded from the protection scope of the application.

Claims

1. A rotating torque balancing device for balancing the torque generated when a movable part (2) pivoted on a fixed part (1) is rotated, characterized in that, The device comprises: a resilient part arranged on the fixed part (1); a pulley transmission part, one end of which is associated with the movable part (2), and the other end of which is associated with the resilient part; when an external force drives the movable part (2) to rotate relative to the fixed part (1), the movable part (2) compresses the resilient part through the pulley transmission part, and the resilient part generates a counterforce equivalent to the external force to achieve torque balance; the resilient part comprises: a mounting seat (4) mounted on the fixed part (1); a sliding block (10) slidingly arranged on the mounting seat (4), and the sliding block (10) is associated with the movable part (2) through the pulley transmission part; the pulley transmission part comprises: an adapter block (3) fixed on the movable part (2); a first traction rope (5-1) and a second traction rope (5-2) located on both sides of the adapter block (3), and one end of each of the first traction rope (5-1) and the second traction rope (5-2) is fixedly connected to the adapter block (3), the other end of the first traction rope (5-1) is fixedly connected to the wing plate of the mounting seat (4) on the same side after being turned by a first pulley set, and the other end of the second traction rope (5-2) is fixedly connected to the wing plate of the mounting seat (4) on the same side after being turned by a second pulley set; the first pulley set comprises: a first movable pulley set (7) rotatably arranged on the sliding block (10); the second pulley set comprises: a second movable pulley set (9) rotatably arranged on the sliding block (10).

2. The rotating torque balancing device of claim 1, wherein, The rotation axis of the movable part (2) is perpendicular to the length direction of the fixed part (1) and the movable part (2) at the same time.

3. A rotating torque balancing device according to claim 1 or 2, characterized in that The resilient part further comprises: a resilient member (11) arranged between the mounting seat (4) and the sliding block (10); when an external force drives the movable part (2) to rotate relative to the fixed part (1), the movable part (2) drives the sliding block (10) to compress the resilient member (11) through the pulley transmission part, and the resilient member (11) generates a counterforce equivalent to the external force.

4. The rotating torque balancing device of claim 3, wherein, The mounting seat (4) is in a groove type, and a guide column (13) is arranged between the two wing plates of the mounting seat (4), the guide column (13) penetrates through the sliding block (10) and forms a sliding pair with the sliding block (10).

5. The rotating torque balancing device of claim 4, wherein, The resilient member (11) is a set of compression springs, a set of the compression springs are sleeved on the guide column (13) between the sliding block (10) and the wing plate on one side of the mounting seat (4), and one end of the compression spring abuts against the wing plate of the mounting seat (4), and the other end of the compression spring abuts against the sliding block (10).

6. The rotating torque balancing device of claim 4, wherein, The resilient member (11) is two sets of compression springs, and the two sets of compression springs are respectively sleeved on the guide column (13) between the sliding block (10) and the wing plates on both sides of the mounting seat (4). Meanwhile, the elastic part further comprises two sliding pressing plates (14), which are respectively arranged on the guide columns (13) on both sides of the sliding pressing block (10); one end of each of the two groups of compression springs is respectively abutted against the side plates on both sides of the mounting seat (4), and the other end of each of the two groups of compression springs is respectively abutted against the two sliding pressing plates (14).

7. The rotating torque balancing device of claim 6, wherein, At least one limiting block (18) is arranged on the web plate of the mounting seat (4) between the two sliding pressing plates (14).

8. The rotating torque balancing device of claim 1, wherein, The first pulley set further comprises: a first fixed pulley set (6) rotatably arranged on one side plate of the mounting seat (4); The second pulley set further comprises: a second fixed pulley set (8) rotatably arranged on the other side plate of the mounting seat (4).

9. The rotating torque balancing device of claim 8, wherein, The first fixed pulley set (6) comprises a first fixed pulley (6-1) and a second fixed pulley (6-2) rotatably connected to one side plate of the mounting seat (4) through two pin shafts (15), the first movable pulley set (7) comprises a first movable pulley (7-1) and a second movable pulley (7-2) rotatably connected to the sliding pressing block (10) through two pin shafts (16), and the other end of the first traction rope (5-1) is connected to one side plate of the mounting seat (4) after sequentially passing through the first fixed pulley (6-1), the first movable pulley (7-1), the second fixed pulley (6-2) and the second movable pulley (7-2).

10. The rotating torque balancing device of claim 8, wherein, The second fixed pulley set (8) comprises a third fixed pulley (8-1) and a fourth fixed pulley (8-2) rotatably connected to the other side plate of the mounting seat (4) through another two pin shafts (15), the second movable pulley set (9) comprises a third movable pulley (9-1) and a fourth movable pulley (9-2) rotatably connected to the sliding pressing block (10) through the same two pin shafts (16), and the other end of the second traction rope (5-2) is connected to the other side plate of the mounting seat (4) after sequentially passing through the third fixed pulley (8-1), the third movable pulley (9-1), the fourth fixed pulley (8-2) and the fourth movable pulley (9-2).

11. The rotating torque balancing device of any one of claims 1, 8-10, wherein, The traction rope adjusting part is used for adjusting the positions of the first traction rope (5-1) and the second traction rope (5-2), so that the sliding pressing block (10) is located at the middle position of the guide column (13) between the two side plates of the mounting seat (4) when balanced.

12. The rotating torque balancing device of claim 11, wherein, The traction rope adjusting part comprises: a first threaded stud (17-1) and a second threaded stud (17-2) arranged on the two side plates of the mounting seat (4) respectively, and external threads are formed on the first threaded stud (17-1) and the second threaded stud (17-2); The first adjusting block (12-1) and the second adjusting block (12-2) are hollow cylinders, and the first adjusting block (12-1) and the second adjusting block (12-2) are respectively internally formed with internal threads matched with external threads of the first stud (17-1) and the second stud (17-2), the first adjusting block (12-1) and the second adjusting block (12-2) are respectively threadedly connected to the first stud (17-1) and the second stud (17-2), and the first traction rope (5-1) and the second traction rope (5-2) are respectively fixedly connected to the first adjusting block (12-1) and the second adjusting block (12-2).

13. The rotating torque balancing device of claim 12, wherein, The first adjusting block (12-1) and the second adjusting block (12-2) are respectively axially formed with a gap, the other ends of the first traction rope (5-1) and the second traction rope (5-2) are respectively formed with a protruding spherical portion, and the first traction rope (5-1) and the second traction rope (5-2) are respectively arranged in the first adjusting block (12-1) and the second adjusting block (12-2) through the gap, so that the spherical portions of the first traction rope (5-1) and the second traction rope (5-2) are respectively limited in the first adjusting block (12-1) and the second adjusting block (12-2).

14. A rotary joint comprising a fixed part (1) and a mobile part (2) hinged, characterized in that, The rotating torque balancing device also comprises the rotating torque balancing device according to any one of claims 1 to 13.

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