Reaction force arm

Abstract

The counter-acting force arm comprises a main shaft, and one end of the main shaft is fixedly connected with the base; the balancer is fixedly connected to the other end of the main shaft, and a rotary encoder II and a coil spring are arranged in the balancer; the auxiliary shaft is connected with the main shaft through a rotating block and can revolve around the main shaft, and the upper end of the auxiliary shaft extends into the balancer and is connected with a second rotary encoder to monitor the rotation angle; the bearing seat is arranged on the main shaft and the auxiliary shaft in a sleeving mode at the same time, can freely slide and rotate on the main shaft and is connected with a coil spring in the balancer through a steel wire rope; and the first force arm is fixedly mounted on the bearing seat. The balance device is compact and reasonable in structure and convenient to operate, the adaptability between the balancer and the force arm is improved by improving the connection mode of the balancer, the main shaft and the auxiliary shaft, then the working stability of the force arm is improved, the precision is higher, the tension change is more stable by improving the structure of the coil spring, stable balance force is provided for the force arm, and the service life of the balance device is prolonged. And the processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary machinery, in particular to a reaction force arm. Background Art

[0002] At present, in the assembly process of the production line, the process of tightening the screws will generate a reaction force. In order to avoid the harm caused by this reaction force to the operator, a reaction balancing arm is usually used, which can offset the reaction force when the screws are tightened. The reaction force arms on the existing market are such as the reaction force arms disclosed in Chinese patents CN210010940U and CN205148218U. The reaction force arms in the above two patents have similar structures and are composed of a main shaft, a secondary shaft, two arms, two angle sensors and a spring balance. They can all offset the reaction force when the screws are tightened and can perform angle positioning with a certain accuracy. However, when tightening the screws, whether the deadweight of the power tool and the structure itself can be better offset is not mentioned in this utility model. Although a spring balancer is also used, it has not yet been able to better offset the deadweight to reduce the operating fatigue of personnel.

[0003] The balancer in the traditional reaction force arm is generally external, which requires a long time to debug when it is matched with the arm, and has poor stability. In addition, the spring structure used in the traditional balancer is a conventional coil spring. Although the inner and outer rings of the coil spring are designed to be tight outside and loose inside, the spacing of the inner ring is irregularly distributed, so the force provided in actual use is unstable, which affects the use effect. For this reason, we propose a reaction force arm. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a reaction lever arm, which improves the adaptability between the balancer and the lever arm, and then improves the working stability of the lever arm.

[0005] The technical solution adopted by the utility model is as follows:

[0006] Reaction arm, comprising:

[0007] A main shaft, one end of which is fixedly connected to the base;

[0008] A balancer is fixedly connected to the other end of the main shaft and has a second rotary encoder and a coil spring built in;

[0009] A secondary shaft, which is connected to the main shaft through a rotating block and can revolve around the main shaft, the upper end of the secondary shaft extends into the balancer and is connected to the second rotary encoder to monitor the rotation angle;

[0010] The bearing seat is sleeved on the main shaft and the secondary shaft at the same time, and can slide and rotate freely on the main shaft. The bearing seat is connected to the coil spring in the balancer through a wire rope to provide a reaction force;

[0011] The first lever arm is fixedly mounted on the bearing seat and is used to expand the operating range of the device.

[0012] It is further characterized by:

[0013] It also includes an upper limit ring and a lower limit ring, which are respectively installed at the upper and lower ends of the main shaft to limit the sliding range of the bearing seat.

[0014] A second joint bearing seat is installed on the first force arm, and a rotary encoder 1 and a second force arm are provided on the second joint bearing seat to achieve precise control of torque and angle.

[0015] The coil spring comprises a loose layer and a tight layer, wherein there are equidistant gaps between the loose layers and there are no gaps between the tight layers.

[0016] Also included is an adapter block, which is mounted on the second force arm.

[0017] The second rotary encoder is rotatably connected to the upper end of the main shaft.

[0018] The coil spring can also be connected to the first lever arm via a steel wire rope.

[0019] The main shaft and the secondary shaft are arranged in parallel.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model has a compact and reasonable structure and is easy to operate. By improving the connection method of the balancer, the main shaft and the secondary shaft, the adaptability between the balancer and the lever arm is improved, thereby improving the working stability of the lever arm and having higher precision. By further improving the structure of the coil spring, the pulling force changes more smoothly, providing a stable balancing force for the lever arm and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 It is a cross-sectional view of the connection structure of the balancer, the main shaft and the secondary shaft of the utility model.

[0024] Figure 3 It is a structural diagram of the coil spring in the utility model.

[0025] Figure 4 It is a mechanical characteristic diagram of the coil spring in the utility model.

[0026] in:

[0027] 1. Balancer; 2. Upper limit ring; 3. Bearing seat; 4. Countershaft; 5. Main shaft; 6. Lower limit ring; 7. Rotating block; 8. Base; 9. Adapter block; 10. Second force arm; 11. Second joint bearing seat; 12. Rotary encoder 1; 13. First force arm; 14. Coil spring; 1401. Tight layer; 1402. Relaxed layer; 15. Rotary encoder 2; 16. Connector. DETAILED DESCRIPTION

[0028] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0029] Reference Figure 1 The purpose of the utility model is to provide a reaction balancing lever arm, which improves the balancing effect of the spring balancer on the basis of the traditional lever arm, thereby offsetting the weight of the lever arm structure and the power tool installed thereon, thereby saving more effort when tightening screws.

[0030] like Figure 1-Figure 4 As shown, the reaction balancing force arm of the utility model is mainly composed of a base 8, a main shaft 5, an upper limit ring 2, a lower limit ring 6, a swivel block 7, a bearing seat 3, a balancer 1, a first force arm 13, a second joint bearing seat 11, a rotary encoder 12, a second force arm 10 and an adapter block 9. At the same time, a rotary encoder 2 15 and a coil spring 14 are arranged in the balancer 1.

[0031] Specifically, in this embodiment, the base 8 stably supports the entire device, and the main shaft 5 is vertically installed on the base 8 as the core support structure of the device. The upper limit ring 2 and the lower limit ring 6 are respectively installed at the upper and lower ends of the main shaft 5 to limit the sliding range of the bearing seat 3 to ensure that it runs within a safe range.

[0032] The bearing seat 3 is mounted on the main shaft 5 and can slide and rotate freely on the main shaft. The balancer 1 is mounted on the upper end of the main shaft 5 and is precisely connected to the bearing seat 3 through a steel wire rope to form an integrated structure, which improves the overall stability and has better adaptability, providing the necessary pulling force to offset gravity and ensure the stability of the bearing seat 3 during rotation. At the same time, the built-in rotary encoder 15 of the balancer 1 can output the precise rotation angle of the bearing seat 3 in real time, providing accurate feedback to the operator.

[0033] In this embodiment, Figure 2 As shown, the lower end of the main shaft 5 is connected to the secondary shaft 4 through the rotating block 7, so that the secondary shaft 4 can revolve around the main shaft 5. At the same time, the upper end of the secondary shaft 4 extends into the balancer 1 and is connected to the rotary encoder 2 15 through the connecting piece 16, so that the secondary shaft 4, the rotary encoder 2 15 and the balancer 1 can rotate together, so that the balancer 1 and the bearing seat 3 rotate synchronously, and it can also facilitate the docking of the wire rope, thereby improving the overall stability.

[0034] In this embodiment, since the balancer 1 rotates synchronously with the bearing seat 3 and the first force arm 13 is fixedly connected to the bearing seat 3, the coil spring 14 in the balancer 1 can also be connected to the first force arm 13 through a wire rope, further improving the installation effect, which is different from the prior art that can only be connected to the sliding seat.

[0035] In this embodiment, Figure 2 As shown, the rotary encoder 2 15 is rotatably connected to the upper end of the main shaft 5 to form an integral structure.

[0036] In this embodiment, the first lever 13 is mounted on the bearing seat 3, further expanding the operating range of the device. The second joint bearing seat 11 is mounted on the first lever 13, equipped with a rotary encoder 12 and a second lever 10, to achieve precise control of torque and angle. The adapter block 9 is mounted on the second lever 10, which can be adapted to various types of tools and equipment to meet the needs of different work scenarios.

[0037] In this embodiment, the base 8 is cast from a special alloy material, which can ensure that the device remains stable in various working environments.

[0038] At the center of the base 8, we vertically installed a spindle 5. This spindle 5 is the core component of the entire device. It not only supports all moving parts, but also bears various forces and torques. In order to ensure the strength and rigidity of the spindle 5, we selected high-strength alloy steel as the material, and it has undergone strict heat treatment and precision processing.

[0039] At the upper and lower ends of the spindle 5, we installed an upper limit ring 2 and a lower limit ring 6 respectively. The two limit rings are very important. They can ensure that the sliding range of the bearing seat 3 on the spindle 5 is always within the safe range, thereby preventing accidents caused by exceeding the predetermined stroke. At the same time, the material of the limit ring has also been specially selected to ensure its wear resistance and durability.

[0040] Next, we installed the swivel block 7 and the bearing seat 3 on the main shaft 5. The swivel block 7 is a key component connecting the secondary shaft 4, which enables the secondary shaft 4 to revolve around the main shaft 5. The bearing seat 3 can slide and rotate freely on the main shaft 5. This design gives the device a higher degree of freedom and flexibility. In order to monitor the rotation angle of the bearing seat 3 in real time, we installed a high-precision balancer 1 on the upper end of the main shaft 5. The balancer has a built-in high-performance rotary encoder 1, which can output the precise rotation angle of the bearing seat 3 in real time.

[0041] The balancer 1 is not only used to monitor the angle, but also precisely connected to the bearing seat 3 through a wire rope to provide the necessary tension to offset the gravity. This design ensures that the bearing seat 3 can always remain stable during rotation, thereby improving the operating accuracy and stability of the entire device.

[0042] In order to further expand the function and application scope of the device, we installed the first lever arm 13 on the bearing seat 3, and installed the second joint bearing seat 11 on the first lever arm 13. The second joint bearing seat 11 is equipped with a rotary encoder 12 and a second lever arm 10. This design enables the device to achieve precise control of torque and angle. At the same time, the second lever arm 10 is also equipped with an adapter block 9, which can be adapted to various types of tools and equipment, thereby meeting the needs of different work scenarios.

[0043] In actual operation, when the tool is installed on the adapter block 9, due to the effect of gravity, the first force arm 13 and the second force arm 10 will slide downward along the main shaft 5. At this time, the operator needs to offset this part of gravity by adjusting the balancer 1. The coil spring structure inside the balancer 1 is specially designed to provide continuous and smooth tension changes, so that the operator can easily find the balance point and maintain the stability of the device.

[0044] Reference Figure 2 , shows the structure diagram of the coil spring in the utility model. The coil spring is a key component of the balancer 1, and its structural design has been carefully optimized to provide continuous and smooth tension changes. This allows the operator to easily find the balance point when adjusting the balancer and maintain the stability of the device. The material and manufacturing process of the coil spring are also strictly selected and controlled to ensure its durability and reliability.

[0045] There are gaps between the inner turns of the coil spring 14, i.e., the loose layers 1402, and the gaps are the same, while there are no gaps between the outer turns, i.e., the tight layers 1401. Such a design helps the tension to rise quickly in the first few turns, and the tension to change more slowly in the last few turns. The purpose is to make the force arm quickly receive a certain tension when adjusting the balancer 1, so as to reach the minimum tension required by the force arm, without having to adjust multiple turns to reach a certain tension. Within the working load range after reaching a certain tension, the tension changes less with the increase in the number of turns, so that the force arm can have a stable balancing force within a longer stroke.

[0046] Reference Figure 3 , showing the mechanical characteristic diagram of the coil spring in the utility model. The curve in the figure clearly shows the change of tension of the coil spring under different stretching lengths. It can be seen that the design of the coil spring makes the tension change smooth and continuous, providing stable tension support for the operator. This design not only helps to offset gravity, but also ensures the stability and accuracy of the device during operation.

[0047] Compared with the previous reaction balancing arm, its structure is mainly composed of a separate balancer 1 hanging on the upper end of the main shaft 5. In the utility model, the balancer 1 is integrated with the structure, and the whole is more compact. In addition, the balancing force of the balancer 1 is optimized to make its change more gentle, so that the load can be offset by gravity in a larger stroke. At the same time, due to the limitation of the structural freedom, the reaction torque generated when tightening the screw can be offset. The rotary encoder 1 at the two joints can output the rotation angle of the first lever arm 13 and the second lever arm 10, so as to realize the positioning function.

[0048] Once the device reaches a balanced state, the operator can easily move the tool up and down to perform various operations, such as tightening screws, drilling holes, etc. During this process, the device can automatically offset the reaction torque generated by the operation, thereby ensuring the stability and accuracy of the operation. This feature is crucial for work scenarios that require high-precision operations.

[0049] The specific working principle is as follows:

[0050] When the tool is installed on the adapter block 9, the first force arm 13 and the second force arm 10 will slide downward along the main shaft 5 due to gravity. At this time, the balancer 1 needs to be adjusted. At this time, the balancer 1 is adjusted to a suitable balancing force so that the pulling force of the balancer 1 offsets the gravity. At this time, the tool can hardly feel gravity when pulling up and down. When the tool is used to tighten the screw, the first force arm 13 and the second force arm 10 will offset the reaction torque generated when tightening the screw due to the limitation of the structural freedom, so that the screw tightening work can be performed labor-saving and safely. When the first force arm 13 and the second force arm 10 are rotated, the two rotary encoders will output corresponding angle values, so that the current position of the tool can be known.

[0051] In general, through precise design and advanced control technology, the reaction balance arm of the utility model realizes the effective offset of gravity and reaction torque and the precise control of operation accuracy. This device not only improves the convenience and safety of operation, but also provides strong support for various industrial applications that require high-precision operation. At the same time, its flexibility and scalability also enable the device to be widely used in various different work scenarios and needs.

[0052] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A reaction arm, characterized in that: include: A main shaft, one end of which is fixedly connected to the base; A balancer is fixedly connected to the other end of the main shaft and has a second rotary encoder and a coil spring built in; A secondary shaft, which is connected to the main shaft through a rotating block and can revolve around the main shaft, the upper end of the secondary shaft extends into the balancer and is connected to the second rotary encoder to monitor the rotation angle; The bearing seat is sleeved on the main shaft and the secondary shaft at the same time, and can slide and rotate freely on the main shaft. The bearing seat is connected to the coil spring in the balancer through a wire rope to provide a reaction force; The first lever arm is fixedly mounted on the bearing seat and is used to expand the operating range of the device.

2. The reaction arm according to claim 1, characterized in that: It also includes an upper limit ring and a lower limit ring, which are respectively installed at the upper and lower ends of the main shaft to limit the sliding range of the bearing seat.

3. The reaction arm according to claim 1, characterized in that: A second joint bearing seat is installed on the first force arm, and a rotary encoder 1 and a second force arm are provided on the second joint bearing seat to achieve precise control of torque and angle.

4. The reaction arm according to claim 1, characterized in that: The coil spring comprises a loose layer and a tight layer, wherein there are equidistant gaps between the loose layers and there are no gaps between the tight layers.

5. The reaction arm according to claim 3, characterized in that: Also included is an adapter block, which is mounted on the second force arm.

6. The reaction arm according to claim 1, characterized in that: The second rotary encoder is rotatably connected to the upper end of the main shaft.

7. The reaction arm according to claim 1, characterized in that: The coil spring can also be connected to the first lever arm via a steel wire rope.

8. The reaction arm according to claim 1, characterized in that: The main shaft and the secondary shaft are arranged in parallel.

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