Balancing rod assembly and four-connecting-rod balance arm

Abstract

The utility model relates to the technical field of balance arms, and particularly discloses a balance rod assembly and a four-connecting-rod balance arm. The balance rod assembly comprises a friction cylinder, a friction rod, a first friction piece and a first pressing piece; the sufficient friction force between the first friction piece and the friction cylinder can be guaranteed by changing the pressing degree of the first pressing piece on the first friction piece, and due to the fact that the first pressing piece is installed at one end of the first friction piece, the purpose that the compression amount of the first friction piece is controlled in an axial compression mode is achieved; and the compression precision of the first friction piece is improved while the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of balance arms, and particularly relates to a balance rod assembly and a four-link balance arm. Background Art

[0002] During use, the friction member inside the balance rod assembly needs to be pre-compressed to ensure sufficient friction force between the friction member itself and the friction cylinder. In actual work, the compression amount of the friction member needs to be controlled to a relatively high level to ensure that the friction force between the friction member and the friction cylinder meets the actual work requirements.

[0003] The prior art usually performs radial compression on the circumference of the friction member. However, it is very difficult to control the compression amount in this way, resulting in a situation where the friction force between the friction member and the friction cylinder does not match the actual work requirements. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a balance rod assembly, aiming to solve the problem that it is very difficult to control the compression amount of the friction member by using the radial compression method in the prior art, resulting in a situation where the friction force between the friction member and the friction cylinder does not match the actual requirements.

[0005] To achieve the above purpose, the utility model proposes a balance rod assembly, including:

[0006] A friction cylinder, an installation cavity is formed along its length direction inside the friction cylinder;

[0007] A friction rod, the friction rod is slidably installed in the installation cavity, and a first convex ring is arranged on the circumference of the friction rod;

[0008] A first friction member; the first friction member is sleeved on the friction rod, and one end abuts against the first convex ring, and the outer circumference of the first friction member abuts against the cavity wall of the installation cavity; and

[0009] A first pressing member; the first pressing member is installed at one end of the first friction member away from the first convex ring to press the first friction member.

[0010] In an embodiment, the first pressing member includes a pressing block and an adjusting member, the pressing block abuts against one end of the first friction member away from the first convex ring, and the adjusting member is threadedly connected to the friction rod to press the pressing block against one end of the first friction member away from the first convex ring.

[0011] In an embodiment, the first pressing member further includes a first gasket, and the first gasket is arranged between the pressing block and the adjusting member.

[0012] In one embodiment, a plurality of the first friction members are provided, and the plurality of the first friction members are sequentially arranged along the length direction of the first cavity, and the first pressing member presses against the first friction member at the farthest end relative to the first convex ring.

[0013] In one embodiment, a second convex ring is provided inwardly on the cavity wall of the installation cavity, and the second convex ring divides the installation cavity into a first cavity and a second cavity;

[0014] The first friction member is slidably disposed in the first cavity, the second cavity is equipped with a second friction member and a second pressing member, one end of the second friction member abuts against the second convex ring, the second pressing member is movably connected to the second cavity and is located at the other end of the second friction member to press the second friction member.

[0015] In one embodiment, a plurality of second friction members are provided, and the plurality of second friction members are sequentially arranged along the length direction of the second cavity, and the second pressing member presses against the second friction member at the farthest end relative to the second convex ring.

[0016] In one embodiment, a second gasket is provided between the second friction member and the second pressing member;

[0017] And / or, the second pressing member is threadedly connected to the cavity wall of the second cavity.

[0018] In one embodiment, the balance bar assembly further includes a spring and a spring pressure block, wherein the spring is sleeved on the outer peripheral side of the friction cylinder and partially extends out of the friction cylinder, and the spring pressure block includes a pressure block body and a boss connected to each other, wherein the pressure block body is provided with a through hole, and the pressure block body is sleeved on the friction bar at a position close to the spring extension end through the through hole, and the boss abuts against the edge of the spring extension end;

[0019] A first connecting member is installed at one end of the friction rod close to the spring pressure block, and the first connecting member is used for rotationally connecting with the external upper arm assembly;

[0020] A second connecting member is installed at one end of the friction cylinder away from the spring pressure block, and the second connecting member is used for rotationally connecting with the external lower arm assembly.

[0021] The utility model also proposes a four-link balance arm, including a switching assembly, an upper arm assembly and a lower arm assembly arranged in parallel, a balance rod assembly and a lower support arm, the balance rod assembly is the balance rod assembly as described above, one opposite end of the upper arm assembly and the lower arm assembly is rotatably connected to the switching assembly, and the other opposite end is rotatably connected to the lower support arm, one end of the balance rod assembly is rotatably connected to the upper arm assembly, and the other end is rotatably connected to the lower arm assembly.

[0022] In one embodiment, the upper arm assembly further includes a sliding member, one end of the balance bar assembly is connected to the sliding member, the upper arm assembly is correspondingly provided with a chute, and the sliding member slides in the chute to drive the balance bar assembly to move.

[0023] The utility model provides a balance bar assembly, which includes a friction cylinder, a friction rod, a first friction member and a first pressing member. An installation cavity is formed inside the friction cylinder along its own length direction, the friction rod is slidably installed in the installation cavity, a first convex ring is arranged on the circumference of the friction rod, the first friction member is sleeved on the friction rod so that one end of the first friction member abuts against the first convex ring, and at the same time, the outer circumference of the first friction member abuts against the cavity wall of the installation cavity, and the first pressing member is installed at one end of the first friction member away from the first convex ring. When pre-compressing the first friction member, the pressing degree of the first pressing member on the first friction member can be changed to ensure that there is sufficient friction between the first friction member and the friction cylinder. Since the first pressing member is installed at one end of the first friction member, the compression amount of the first friction member is controlled by means of axial compression, which is convenient for operation and improves the compression accuracy of the first friction member. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the balance bar assembly of the present utility model;

[0026] Figure 2 For Figure 1 the cross-sectional view of the embodiment in;

[0027] Figure 3 It is a schematic structural diagram of an embodiment of the four-link balance arm of the present utility model;

[0028] Figure 4 For Figure 3 the schematic structural diagram of the other perspective of the embodiment in.

[0029] Explanation of the reference numerals in the drawings:

[0030] 100. Four-bar balancing arm; 10. Balancing bar assembly; 11. Friction cylinder; 111. Mounting cavity; 112. Second convex ring; 12. Friction bar; 121. First convex ring; 13. First friction member; 14. First clamping member; 141. Pressure block; 142. Adjusting member; 143. First gasket; 15. Second friction member; 16. Second clamping member; 17. Second gasket; 18. Spring; 19. Spring pressure block; 101. First connecting member; 102. Second connecting member; 20. Adapter assembly; 30. Upper arm assembly; 31. Sliding member; 311. Adjusting screw; 312. Sliding block; 313. Locking member; 40. Lower arm assembly; 50. Lower support arm.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] When the friction piece inside the balance rod assembly is in use, it needs to be pre-compressed to ensure sufficient frictional force between the friction piece itself and the friction cylinder. In actual work, the compression amount of the friction piece needs to be controlled to a relatively high level to ensure that the frictional force between the friction piece and the friction cylinder meets the actual work requirements. Currently, radial compression is usually applied to the circumferential direction of the friction piece. However, it is very difficult to control its compression amount in this way, resulting in the situation that the frictional force between the friction piece and the friction cylinder does not match the actual work requirements easily.

[0036] To solve the above problems, the present utility model proposes a balance rod assembly, aiming to solve the problem that it is very difficult to control the compression amount of the friction piece by the existing radial compression method, resulting in the situation that the frictional force between the friction piece and the friction cylinder does not match the actual requirements easily.

[0037] As Figure 1 and Figure 2 , in an embodiment, the balance rod assembly 10 includes a friction cylinder 11, a friction rod 12, a first friction piece 13 and a first pressing member 14. An installation cavity 111 is formed inside the friction cylinder 11 along its length direction. The friction rod 12 is slidably installed in the installation cavity 111. A first convex ring 121 is circumferentially arranged on the friction rod 12. The first friction piece 13 is sleeved on the friction rod 12 and one end abuts against the first convex ring 121. The outer circumference of the first friction piece 13 abuts against the inner wall of the installation cavity 111. The first pressing member 14 is installed at one end of the first friction piece 13 away from the first convex ring 121 to press the first friction piece 13.

[0038] In this embodiment, the friction rod 12 can slide in the installation cavity 111. At the same time, a first convex ring 121 is circumferentially arranged on the friction rod 12. The first convex ring 121 plays a role in limiting and fixing one end of the first friction piece 13. At the same time, the size of the first convex ring 121 is adapted to the inner diameter size of the installation cavity 111 to ensure that the friction rod 12 does not shake when sliding in the installation cavity 111. The first friction piece 13 is of a cylindrical structure and is sleeved on the friction rod 12. Its material can be selected from materials with a high friction coefficient, such as rubber. The first friction piece 13 is located between the first pressing member 14 and the first convex ring 121. When it is necessary to adjust the frictional force, the pressing degree of the first pressing member 14 on the first friction piece 13 in the axial direction can be changed to adjust the contact pressure between the first friction piece 13 and the inner wall of the installation cavity 111, and then the sliding frictional force of the friction rod 12 in the installation cavity 111 can be adjusted, so that the balance rod assembly 10 can adapt to different working conditions and improve the performance and efficiency of the equipment. At the same time, the axial compression method is simple to operate, thus improving the adjustment efficiency of the operator.

[0039] The present utility model provides a balance bar assembly 10, which includes a friction cylinder 11, a friction rod 12, a first friction member 13 and a first pressing member 14. An installation cavity 111 is formed inside the friction cylinder 11 along its length direction. The friction rod 12 is slidably installed in the installation cavity 111. A first convex ring 121 is circumferentially arranged on the friction rod 12. The first friction member 13 is sleeved on the friction rod 12 so that one end of the first friction member 13 abuts against the first convex ring 121. At the same time, the outer circumference of the first friction member 13 abuts against the cavity wall of the installation cavity 111. The first pressing member 14 is installed at one end of the first friction member 13 away from the first convex ring 121. When pre-compressing the first friction member 13, the pressing degree of the first pressing member 14 on the first friction member 13 can be changed to ensure that there is sufficient friction between the first friction member 13 and the friction cylinder 11. Since the first pressing member 14 is installed at one end of the first friction member 13, the first friction member 13 is axially compressed to control its compression amount, which is convenient for operation and improves the compression accuracy of the first friction member 13.

[0040] As Figure 2 , in an embodiment, the first pressing member 14 includes a pressing block 141 and an adjusting member 142. The pressing block 141 abuts against one end of the first friction member 13 away from the first convex ring 121. The adjusting member 142 is threadedly connected to the friction rod 12 to press the pressing block 141 against one end of the first friction member 13 away from the first convex ring 121.

[0041] In this embodiment, the first pressing member 14 includes a pressing block 141 and an adjusting member 142 which are designed separately. The adjusting member 142 is a bolt. The friction rod 12 is correspondingly provided with a threaded section. When the friction needs to be adjusted, the operator can rotate the adjusting member 142 to move it along the thread direction of the friction rod 12, so as to change the compression degree of the pressing block 141 on the first friction member 13. The contact pressure between the first friction member 13 and the inner wall of the friction cylinder 11 also changes accordingly, thereby realizing the adjustment of the friction force. In this embodiment, by using the adjusting member 142 with threaded connection, the operator can finely adjust the position of the pressing block 141, thereby accurately controlling the magnitude of the friction force. At the same time, the operation is simple, the adjustment is rapid, and the practicability of the balance bar assembly 10 is improved.

[0042] As Figure 2 , in an embodiment, the first pressing member 14 further includes a first gasket 143, and the first gasket 143 is arranged between the pressing block 141 and the adjusting member 142.

[0043] In this embodiment, a first gasket 143 is further provided between the pressing block 141 and the adjusting member 142. The design of the first gasket 143 can improve the pressing degree between the adjusting member 142 and the pressing block 141, thereby further improving the adjustment accuracy of the adjusting member 142. At the same time, it can also reduce the direct contact between the adjusting member 142 and the pressing block 141, thereby reducing wear and extending the service life of both, and thus improving the overall durability of the balance rod assembly 10.

[0044] As Figure 1 and Figure 2 , in one embodiment, a plurality of first friction members 13 are provided. The plurality of first friction members 13 are arranged in sequence along the length direction of the first cavity, and the first pressing member 14 presses against the first friction member 13 at the farthest end relative to the first convex ring 121.

[0045] In this embodiment, the number of the first friction members 13 is at least two, and the specific number is not limited herein. The plurality of first friction members 13 are arranged in sequence along the length direction of the first cavity, and the first pressing member 14 presses against the first friction member 13 at the farthest end, that is, the first friction member 13 located at the farthest position relative to the first convex ring 121 in the length direction of the first cavity. Through the above setting method, when adjusting the first pressing member 14, the pressing degree of a plurality of first friction members 13 can be controlled simultaneously, so as to achieve a more precise friction force adjustment. In addition, since different working environments may require different friction forces, this embodiment can adapt to different needs by increasing or decreasing the number of the first friction members 13, thereby improving the applicability of the balance rod assembly 10.

[0046] As Figure 2 , in one embodiment, a second convex ring 112 is provided on the inner wall of the installation cavity 111, and the second convex ring 112 divides the installation cavity 111 into a first cavity and a second cavity;

[0047] The first friction member 13 slides in the first cavity. A second friction member 15 and a second pressing member 16 are installed in the second cavity. One end of the second friction member 15 abuts against the second convex ring 112, and the second pressing member 16 is movably connected to the second cavity and is located at the other end of the second friction member 15 to press the second friction member 15.

[0048] In this embodiment, the second convex ring 112 divides the entire installation cavity 111 into two independent cavities: a first cavity and a second cavity, so as to implement two different friction adjustment mechanisms in the same balance rod assembly 10. The first friction member 13 is slidably disposed in the first cavity, and a frictional force is generated through the contact between the outer circumference of the first friction member 13 and the inner wall of the first cavity to adjust the movement of the friction rod 12; while the second friction member 15 is fixedly installed on the inner wall of the second cavity, and a frictional force is generated through the contact between the friction rod 12 and the inner circumference of the second friction member 15 to adjust the movement of the friction rod 12. At the same time, one end of the second friction member 15 is limited and fixed by the second convex ring 112, and the other end is compressed by the second pressing member 16 to further adjust the magnitude of the frictional force.

[0049] In this embodiment, by respectively arranging friction members and pressing members in the first cavity and the second cavity, dual friction adjustment is achieved, so that the balance rod assembly 10 can adapt to a wider range of working conditions. At the same time, the independent design of the first cavity and the second cavity allows the staff to separately control the frictional forces in the two cavities, thereby providing a more refined adjustment ability. In addition, when a certain friction member is damaged, the balance rod assembly 10 can continue to work through the other friction member, thereby enhancing the safety and reliability of the balance rod assembly 10.

[0050] Such as Figure 2 , in one embodiment, a plurality of second friction members 15 are provided, and the plurality of second friction members 15 are sequentially arranged along the length direction of the second cavity, and the second pressing member 16 presses against the second friction member 15 that is the farthest from the second convex ring 112.

[0051] In this embodiment, the number of the second friction members 15 is at least two, and the specific number is not limited herein. The plurality of second friction members 15 are sequentially arranged along the length direction of the second cavity, and the second pressing member 16 presses against the second friction member 15 at the farthest end, that is, the second friction member 15 that is the farthest from the second convex ring 112 in the length direction of the second cavity. Through the above setting method, when adjusting the second pressing member 16, the pressing degrees of a plurality of second friction members 15 can be controlled simultaneously, so as to achieve a more refined frictional force adjustment. In addition, since different working environments may require different frictional forces, this embodiment can adapt to different requirements by increasing or decreasing the number of the second friction members 15. Through the combined setting of a plurality of first friction members 13 and a plurality of second friction members 15, the applicability of the balance rod assembly 10 is further improved.

[0052] Such as Figure 2 , in one embodiment, a second gasket 17 is provided between the second friction member 15 and the second pressing member 16;

[0053] And / or, the second pressing member 16 is threadedly connected to the cavity wall of the second cavity.

[0054] In this embodiment, the design of the second gasket 17 can improve the pressing degree between the second friction member 15 and the second pressing member 16, so as to realize the fine adjustment of the pressing degree of the second pressing member 16 on the second friction member 15. At the same time, it can also reduce the direct contact between the two, thereby reducing wear and extending the service life of the two, and further improving the overall durability of the balance rod assembly 10.

[0055] On the basis of having or not having the above embodiment, the second pressing member 16 can be a bolt, and a threaded section is provided at the corresponding position on the inner wall of the second cavity. When it is necessary to adjust the frictional force, the staff can rotate the second pressing member 16 to make it rotate along the thread direction of the second cavity, so as to change its own compression degree on the second friction member 15, and the contact pressure between the inner wall of the second friction member 15 and the friction rod 12 also changes accordingly, thereby realizing the precise control of the frictional force. At the same time, the operation is simple, the adjustment is rapid, and the practicability of the balance rod assembly 10 is further improved.

[0056] As Figures 1 to 3 , in one embodiment, the balance rod assembly 10 further includes a spring 18 and a spring pressing block 141. The spring 18 is sleeved on the outer peripheral side of the friction cylinder 11 and partially extends out of the friction cylinder 11. The spring pressing block 141 includes a connected pressing block main body and a convex platform. The pressing block main body is provided with a through hole, and the pressing block main body is sleeved on the friction rod 12 at a position close to the extending end of the spring 18 through the through hole, and the convex platform abuts against the edge of the extending end of the spring 18;

[0057] A first connecting member 101 is installed at one end of the friction rod 12 close to the spring pressing block 141, and the first connecting member 101 is used for rotatably connecting with the external upper arm assembly 30;

[0058] A second connecting member 102 is installed at one end of the friction cylinder 11 away from the spring pressing block 141, and the second connecting member 102 is used for rotatably connecting with the external lower arm assembly 40.

[0059] In this embodiment, a spring 18 with a length greater than its own length is sleeved on the outside of the friction cylinder 11. The spring pressing block 141 is composed of an integrally designed pressing block main body and a convex platform. The pressing block main body is connected to the friction rod 12 at a position close to the extending end of the spring 18 through the through hole opened by itself. The connection method between the two is a threaded connection, which ensures firm connection and is convenient for replacement and disassembly. The convex platform abuts against the edge of the extending end of the spring 18, so as to facilitate the spring pressing block 141 to compress the spring 18. The two ends of the balance rod assembly are respectively installed with a first connecting member 101 and a second connecting member 102, which are used for rotatably connecting the upper arm assembly 30 and the lower arm assembly 40.

[0060] Specifically, when the upper arm assembly 30 and the lower arm assembly 40 rotate, the spring 18 is driven to be compressed or extended through the spring 18 pressure block 141, and at the same time, the spring pressure block 141 drives the friction rod 12 to move relative to the friction cylinder 11, and then the relative position of the friction rod 12 and the friction cylinder 11 is fixed by the friction force generated by the first friction member 13 with a preset compression amount and the inner wall of the first cavity and the friction force generated by the inner wall of the second friction member 15 and the friction rod 12.

[0061] like Figure 3 The utility model also proposes a four-link balancing arm 100, which includes an adapter assembly 20, an upper arm assembly 30 and a lower arm assembly 40 arranged in parallel, a balancing rod assembly 10 and a lower support arm 50. The opposite ends of the upper arm assembly 30 and the lower arm assembly 40 are rotatably connected to the adapter assembly 20, and the other opposite ends are rotatably connected to the lower support arm 50. One end of the balancing rod assembly 10 is rotatably connected to the upper arm assembly 30, and the other end is rotatably connected to the lower arm assembly 40. The specific structure of the balancing rod assembly 10 refers to the above-mentioned embodiment. Since the balancing rod assembly 10 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0062] like Figures 1 to 4 In a specific embodiment, the balance bar assembly 10 is tilted inside the upper arm assembly 30 and the lower arm assembly 40. When the adapter assembly 20 rotates relative to the upper arm assembly 30 and the lower arm assembly 40 or the upper arm assembly 30 and the lower arm assembly 40 rotate relative to the lower support arm 50, the spring 18 of the balance bar assembly 10 inside the two will be retracted or stretched, and the spring pressure block 141 abutting against one end of the spring 18 follows the retracting movement of the spring 18 to drive the friction rod 12 to move relative to the friction cylinder 11, and then the relative position of the friction rod 12 and the friction cylinder 11 is fixed by the friction force generated by the first friction member 13 with a preset compression amount and the inner wall of the first cavity and the friction force generated by the inner wall of the second friction member 15 and the friction rod 12, thereby maintaining the four-bar balance arm 100 in a balanced state to keep it stable.

[0063] In addition, a sliding member 31 is provided on the upper arm assembly 30. The sliding member 31 includes an adjusting screw 311, a slider 312 and a locking member 313. The sliding member 31 is slidably disposed on the two side chutes through the rollers on both sides of itself. At the same time, the friction rod 12 is connected to the lower part of the slider 312. The two ends of the adjusting screw 311 are respectively threadedly connected to the terminal and the starting end of the chute. The locking member 313 is fixedly installed on the upper arm assembly 30 and limits and fixes the adjusting screw 311. The staff can disassemble the locking member 313 and rotate the adjusting screw 311 to drive the slider 312 to slide in the chute. At the same time, the slider 312 drives the friction rod 12 to move, thereby compressing or stretching the spring 18 to finely adjust the balance rod assembly 10, ensuring that the elastic force and frictional force of the balance rod assembly 10 itself can ensure that the overall structure of the four-bar balance arm 100 is in a balanced state, and further improving the practicability of the four-bar balance arm 100.

[0064] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A balance bar assembly, characterized in that, include: A friction cylinder, wherein a mounting cavity is formed inside the friction cylinder along its length direction; A friction rod, the friction rod is slidably mounted in the mounting cavity, and a first convex ring is circumferentially arranged on the friction rod; A first friction member, wherein the first friction member is sleeved on the friction rod and one end of the first friction member abuts against the first convex ring, and the outer side of the first friction member abuts against the wall of the installation cavity in a circumferential direction; and A first pressing member is installed at an end of the first friction member away from the first convex ring to press the first friction member.

2. The balance bar assembly according to claim 1, wherein The first pressing member includes a pressing block and an adjusting member. The pressing block abuts against one end of the first friction member away from the first convex ring. The adjusting member is threadedly connected to the friction rod to press the pressing block against one end of the first friction member away from the first convex ring.

3. The balance bar assembly according to claim 2, wherein, The first pressing member further includes a first gasket, and the first gasket is arranged between the pressing block and the adjusting member.

4. The balance bar assembly according to claim 2, wherein There are multiple first friction members, which are arranged in sequence along the length direction of the installation cavity. The first pressing member presses against the first friction member at the farthest end relative to the first convex ring.

5. The balance bar assembly according to any one of claims 1-4, characterized in that, A second convex ring is provided inwardly on the cavity wall of the installation cavity, and the second convex ring divides the installation cavity into a first cavity and a second cavity; The first friction member is slidably disposed in the first cavity, the second cavity is equipped with a second friction member and a second pressing member, one end of the second friction member abuts against the second convex ring, the second pressing member is movably connected to the second cavity and is located at the other end of the second friction member to press the second friction member.

6. The balance bar assembly according to claim 5, characterized in that, There are multiple second friction members, which are arranged in sequence along the length direction of the second cavity, and the second pressing member presses against the second friction member at the farthest end relative to the second convex ring.

7. The balance bar assembly according to claim 5, characterized in that, A second gasket is provided between the second friction member and the second pressing member; And / or, the second pressing member is threadedly connected to the cavity wall of the second cavity.

8. The balance bar assembly according to any one of claims 1 to 4, characterized in that The balance bar assembly also includes a spring and a spring pressure block, wherein the spring is sleeved on the outer peripheral side of the friction cylinder and partially extends out of the friction cylinder, and the spring pressure block includes a pressure block body and a boss connected to each other, wherein the pressure block body is provided with a through hole, and the pressure block body is sleeved on the friction bar at a position close to the spring extension end through the through hole, and the boss abuts against the edge of the spring extension end; A first connecting member is installed at one end of the friction rod close to the spring pressure block, and the first connecting member is used for rotationally connecting with the external upper arm assembly; A second connecting member is installed at one end of the friction cylinder away from the spring pressure block, and the second connecting member is used for rotationally connecting with the external lower arm assembly.

9. A four-bar balance arm, characterized in that, The four-link balance arm includes an adapter assembly, an upper arm assembly and a lower arm assembly arranged in parallel, a balance rod assembly and a lower support arm. The balance rod assembly is a balance rod assembly as described in any one of claims 1 to 8, wherein one opposite end of the upper arm assembly and the lower arm assembly is rotatably connected to the adapter assembly, and the other opposite end is rotatably connected to the lower support arm. One end of the balance rod assembly is rotatably connected to the upper arm assembly, and the other end is rotatably connected to the lower arm assembly.

10. The four-bar balance arm according to claim 9, characterized in that, The upper arm assembly further includes a sliding member, one end of the balance bar assembly is connected to the sliding member, a chute is correspondingly provided on the upper arm assembly, and the sliding member is slidably arranged in the chute to drive the balance bar assembly to move.

Images