Flexible connecting shaft structure

Abstract

The utility model discloses a flexible connecting shaft structure, which takes the left and the right as the direction of a shaft body, and comprises a flexible connecting block in the middle, and a left connecting plate and a right connecting plate on the two sides, a group of first equal-height screws penetrate through first avoiding holes in the left connecting plate from the left side and then fasten the connecting block and the right connecting plate; the first equal-height screw comprises a screw head and a screw rod part, the screw rod part comprises a threaded section at the front end and a polished rod section close to the screw head, the screw head is in clearance fit with the first receding hole, the polished rod section is in interference fit with the flexible connecting block, and the threaded section is in threaded connection with the right connecting plate; a set of second equal-height screws penetrate through second receding holes in the right connecting plate from the right side to fasten the flexible connecting block and the left connecting plate. The second equal-height screw comprises a screw head and a screw rod part, the screw rod part further comprises a threaded section at the front end and a polished rod section close to the screw head, the screw head is in clearance fit with the second receding hole, the polished rod section is in interference fit with the flexible connecting block, and the threaded section is in threaded connection with the left connecting plate.

Description

Technical Field

[0001] The utility model relates to a flexible connecting shaft structure. Background Art

[0002] In the field of offline automatic test benches for various power or transmission components, or in the field of automatic assembly lines, shaft (sleeve) structures that require automatic docking and torque and rotational speed transmission are often used. In most cases at this time, due to clamping factors of the output shaft of the measured part and assembly precision error factors of the measured product, there is a certain deviation in the position accuracy of the output shaft of the measured part. Therefore, if the automatic docking shaft is made rigid, it will be impossible to dock. Even if it is docked, long-term testing will cause damage to the measured shaft; in the field of automatic assembly, it will be impossible to install it. Even if it is installed, the customer's product may be damaged during rotation.

[0003] There are also cases where a flexible connecting shaft is made by adding a diaphragm coupling or other forms of couplings at the front end of the automatic docking shaft. However, in this case, the front end will droop and the end face runout will be too large, so a mechanism needs to be added to correct it for the initial positioning before docking. At this time, the structure will be relatively complex, occupying a large space, and sometimes it cannot be made due to space factors.

[0004] Currently, the commonly used flexible connecting shaft methods are as Figure 1 and Figure 2 shown. The method of using a rigid automatic docking shaft is used to dock with the output shaft of the measured part or assemble the product. This is suitable for the case where the assembly precision of the measured part product is high, the positioning precision on the tooling is high, and the product consistency is good.

[0005] Referring to Figure 1 , its working principle is that the V-shaped support claws 2 are clamped before docking to fix the initial position of the support shaft 3. When docking is completed, or after the clamped workpiece is placed into the product to be assembled, the V-shaped support claws 2 are released. At this time, the power side (such as a motor) connected by the diaphragm coupling 1 can rotate. Due to the function of the diaphragm coupling 1, the requirement for coaxiality can be reduced.

[0006] Referring to Figure 2 , its working principle is that the connecting shaft 8 is the power side (such as a motor), and the connecting plate 11 is connected to the measured / assembled shaft. In the initial state, the air inlet 4 is ventilated, then the piston rod 6 moves to the right. At this time, the piston rod 6 and the connecting rod 7 are regarded as a whole, and the circumferential anti-torsion is enhanced, so as to ensure a fixed initial position in the circumferential direction; when the connecting plate 11 is docked with the measured part, or after the connected assembled shaft is automatically installed into the product, the air inlet 4 is cut off. At this time, the piston rod 6 moves to the left under the elastic force of the spring 9. At this time, the motor on the power side (connecting shaft 8) rotates. Due to the function of the bellows coupling 5, the requirement for coaxiality can also be greatly reduced; the spacer 10 is also shown in the figure.

[0007] It is docked with the output shaft of the measured part by adding a coupling. Or in the case of loading a rotating shaft part (which needs to rotate after loading) in an automated assembly, this structure is relatively large and cannot be arranged in many cases. Therefore, this method is suitable for a large space with space around the output shaft of the measured part, so it has certain limitations.

[0008] The disadvantages of using a rigid connection shaft structure are obvious. Using a rigid automatic docking shaft will cause difficult docking or damage to the measured part.

[0009] Since the existing test bench has high precision or there are many mechanisms and complex equipment around the general parts in the automated assembly station, especially at the docking part where there are many parts and the operating space is narrow. Therefore, when using a conventional diaphragm coupling or other forms of couplings, it is impossible to make the structure due to space limitations. Summary of the Invention

[0010] The technical problem to be solved by the present utility model is to overcome the above deficiencies of the prior art and provide a flexible connection shaft structure that can reduce the coaxiality requirements during shaft / sleeve docking and can provide flexible compensation during docking or assembly.

[0011] The technical problem to be solved can be implemented through the following technical solutions.

[0012] A flexible connection shaft structure is characterized in that

[0013] Taking the left-right direction as the axis body direction, the flexible connection shaft structure includes a flexible connection block in the middle position, a left connecting plate on the left side, and a right connecting plate on the right side;

[0014] A set of first equal-height screws respectively pass through the first avoidance holes opened at the corresponding positions on the left connecting plate from the left side and then fasten the flexible connection block and the right connecting plate; wherein, the first equal-height screw includes a screw head and a screw rod part, and the screw rod part further includes a threaded section at the front end and a smooth rod section close to the screw head. The screw head part has a clearance fit with the first avoidance hole, the smooth rod section has an interference fit with the flexible connection block, and the threaded section is threadedly connected with the right connecting plate;

[0015] A set of second equal-height screws respectively pass through the second avoidance holes opened at the corresponding positions on the right connecting plate from the right side and then fasten the flexible connection block and the left connecting plate; wherein, the second equal-height screw includes a screw head and a screw rod part, and the screw rod part further includes a threaded section at the front end and a smooth rod section close to the screw head. The screw head part has a clearance fit with the second avoidance hole, the smooth rod section has an interference fit with the flexible connection block, and the threaded section is threadedly connected with the left connecting plate.

[0016] Furthermore, the screw head of the first equal-height screw extending into the first avoidance hole is not higher than the left side plate surface of the left connecting plate.

[0017] Further, the screw head of the second equal-height screw extending into the second avoidance hole is not higher than the right side plate surface of the right connecting plate.

[0018] Further, a plurality of first connecting screws for connecting external components are provided on the left side plate surface of the left connecting plate; a plurality of second connecting screws for connecting external components are provided on the right side plate surface of the right connecting plate.

[0019] Preferably, the flexible connection block is a polyurethane part or a rubber part.

[0020] Further, a group of first equal-height screws includes at least three first equal-height screws.

[0021] Further, a group of second equal-height screws includes at least three second equal-height screws.

[0022] Further, the Shore hardness of the flexible connection block is 30-90 degrees.

[0023] Further, after installing the group of first equal-height screws and the group of second equal-height screws, the end face runout of the left connecting plate and the right connecting plate is within 0.1 mm.

[0024] Further, each first equal-height screw of the group of first equal-height screws and each second equal-height screw of the group of second equal-height screws are on a concentric circle.

[0025] The structure of the present utility model performs flexible compensation on the docking shaft / to-be-assembled shaft, and can reduce the coaxiality requirements of the docking shaft (sleeve) and the docking (sleeve) shaft.

[0026] The structure of the present utility model performs flexible compensation on the docking shaft / to-be-assembled shaft, and can reduce the coaxiality requirements of the docking shaft (sleeve) and the docking (sleeve) shaft; at the same time, it can also solve the problems of difficult docking and difficult assembly caused by different batches of products and poor position accuracy after clamping; it also solves the occasions where rotation is required after assembly / docking (with relatively low coaxiality).

[0027] The structure of the present invention is simple, small, flexible, does not occupy space, is structurally compact, and the parts are easy to process.

[0028] The main parts are polyurethane connection blocks and connecting plates, and the equal-height screws are standard parts, and the cost accounts for a very small proportion of the total cost, so the cost is lower than other structures. Description of the Drawings

[0029] Figure 1 It is one of the structural modes of the flexible connection shaft in the prior art;

[0030] Figure 2 It is one of the structural modes of the flexible connection shaft in the prior art;

[0031] Figure 3 This is a schematic structural view of the flexible connecting shaft of the present utility model;

[0032] Figure 4 is Figure 3 the A-A view in;

[0033] Figure 5 is Figure 4 the B-B view in;

[0034] In the figure: 1. Diaphragm coupling; 2. V-shaped support claw; 3. Support shaft; 4. Air inlet; 5. Bellows coupling; 6. Piston rod; 7. Connecting rod; 8. Connecting shaft; 9. Spring; 10. Pad; 11. Connecting plate;

[0035] 21. First connecting screw; 22. Left connecting plate; 221. First avoidance hole; 23. Connecting block; 24. Right connecting plate; 241. Second avoidance hole; 25. Second connecting screw; 26. First equal-height screw; 27. Second equal-height screw. Specific embodiments

[0036] The following further elaborates on the specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0037] Referring to Figures 3 to 5 , the present utility model provides a flexible connecting shaft structure, including a flexible connecting block 23 in the middle position, and a left connecting plate 22 and a right connecting plate 24 are respectively connected to both sides of the connecting block.

[0038] A group (3 in this embodiment) of first equal-height screws 26 respectively pass through the corresponding first avoidance holes 221 on the left connecting plate 22 from the left side (taking the Figure 4 left side as the reference) to fasten the connecting block 23 and the right connecting plate 24; among them, the first equal-height screw 26 includes two parts: a screw head and a screw rod. The screw rod part is further divided into a threaded section at the front end and a smooth rod section near the screw head. The screw head part has a clearance fit with the first avoidance hole 221, the smooth rod section has an interference fit with the connecting block 23, and the threaded section is threadedly connected to the right connecting plate 24 to realize the fastening connection between the connecting block 23 and the right connecting plate 24. The screw head of the first equal-height screw extending into the first avoidance hole is not higher than the plate surface of the left connecting plate.

[0039] A group (3 in this embodiment) of second equal-height screws 27 respectively pass through from the right side (taking the Figure 4The second equal-height screws 27 (with the right side as the standard) pass through the corresponding second avoidance holes 241 on the right connection plate 24 respectively to fasten the connection block 23 and the left connection plate 22; among them, the second equal-height screw 27 includes a screw head and a screw rod. The screw rod part is further divided into a threaded section at the front end and a smooth rod section near the screw head. The screw head part has a clearance fit with the second avoidance hole 241, the smooth rod section has an interference fit with the connection block 23, and the threaded section is threadedly connected to the left connection plate 22 to realize the fastening connection between the connection block 23 and the left connection plate 22. The screw head of the second equal-height screw extending into the second avoidance hole is not higher than the plate surface of the right connection plate.

[0040] After being fastened, the left connection plate, the connection block and the right connection plate as a whole form a connection shaft structure. In order to reduce the weight, the connection shaft can be processed into a hollow shaft structure.

[0041] In addition, a plurality of first connection screws 21 for connecting external components are provided on the plate surface of one side of the left connection plate 22; a plurality of second connection screws 25 for connecting external components are provided on the plate surface of one side of the right connection plate 24.

[0042] The flexible connection block is preferably a polyurethane part and a rubber part.

[0043] By uniformly embedding the equal-height bolts into the connection plate to avoid the root of the thread in the equal-height screw from being sheared and broken; a group of equal-height bolts controls the embedding depth to ensure that the polyurethane pressing block is evenly stressed; after installing the equal-height screw, the end face runout of the corresponding connection plate is within 0.1 mm.

[0044] Among them, the hardness of the connection block can have various choices, and the hardness between 30 Shore A and 90 Shore A are all commonly used choices.

Claims

1. A flexible connecting shaft structure, characterized in that: Taking the left and right directions as the axis direction, the flexible connection axis structure includes a flexible connection block at the middle position, a left connection plate at the left position, and a right connection plate at the right position; A group of first equal height screws are passed through the first avoidance holes opened at the corresponding positions on the left connection plate from the left side to fasten the flexible connection block to the right connection plate; wherein the first equal height screws include a screw head and a screw rod portion, the screw rod portion includes a threaded section at the front end and a smooth rod section near the screw head, the screw head is clearance-matched with the first avoidance hole, the smooth rod section is interference-fitted with the flexible connection block, and the threaded section is threadedly connected with the right connection plate; A group of second equal-height screws pass through the second avoidance holes opened at the corresponding positions on the right connecting plate from the right side to fasten the flexible connecting block to the left connecting plate; wherein the second equal-height screws include a screw head and a screw rod portion, the screw rod portion includes a threaded section at the front end and a smooth rod section close to the screw head, the screw head has a clearance fit with the second avoidance hole, the smooth rod section has an interference fit with the flexible connecting block, and the threaded section is threadedly connected to the left connecting plate.

2. The flexible connecting shaft structure according to claim 1, characterized in that: The screw head of the first equal height screw extending into the first avoidance hole is not higher than the left side plate surface of the left connecting plate.

3. The flexible connecting shaft structure according to claim 1, characterized in that: The screw head of the second equal-height screw extending into the second avoidance hole is not higher than the right side plate surface of the right connecting plate.

4. The flexible connecting shaft structure according to claim 1, characterized in that: A plurality of first connecting screws for connecting external components are arranged on the left side plate surface of the left connecting plate; a plurality of second connecting screws for connecting external components are arranged on the right side plate surface of the right connecting plate.

5. The flexible connecting shaft structure according to claim 1, characterized in that: The flexible connecting block is a polyurethane piece or a rubber piece.

6. The flexible connecting shaft structure according to claim 1, characterized in that: A set of first contour screws includes at least three first contour screws.

7. The flexible connecting shaft structure according to claim 1, characterized in that: A set of second contour screws includes at least three second contour screws.

8. The flexible connecting shaft structure according to claim 1 or 5, characterized in that: The Shore hardness of the flexible connecting block is 30-90 degrees.

9. The flexible connecting shaft structure according to claim 1, characterized in that: After the set of first equal-height screws and the set of second equal-height screws are installed, the end face runout of the left connecting plate and the right connecting plate is within 0.1 mm.

10. The flexible connecting shaft structure according to claim 1, characterized in that: The first height screws of the group of first height screws and the second height screws of the group of second height screws are located on a concentric circle.

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