An encoder spindle with variable inner diameter

Abstract

The utility model relates to the technical field of encoders, and specifically provides an encoder spindle with a variable inner diameter, wherein an elastic ring is connected to one end of a hollow shaft body, a plurality of grooves are evenly distributed on the elastic ring along the axial direction, and a thread matching the thread on the rotating shaft is provided on the inner diameter surface of the elastic ring; when the user's rotating shaft is screwed into the elastic ring, the elastic ring will deform and automatically adapt to the user's rotating shaft due to the grooves around the elastic ring, and after the user's rotating shaft is screwed into the correct position, the outer side of the elastic ring is locked with a locking sleeve to make the thread connection reliable, and fix the hollow shaft body and the rotating shaft. The utility model can adapt to user rotating shafts of different diameters within a certain range, greatly improves the versatility and applicability of the encoder, and solves the problem of gaps and mismatch between the encoder spindle and the user's rotating shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of encoders, and specifically provides an encoder main shaft with a variable inner diameter. Background Art

[0002] The photoelectric encoder is a high-precision speed and displacement sensor that integrates optical, mechanical and electrical technologies. To match the user's shaft, the encoder spindle can be made into a hollow shaft, which is then put on the user's shaft and fixed. In order to adapt to different usage scenarios and working conditions, the encoder spindle has different aperture sizes. For mature encoder products, the spindle aperture has been standardized, but when customers use it, due to various factors such as installation space, the user-side shaft may not match the spindle aperture.

[0003] In order to solve the compatibility problem between the encoder spindle aperture and the shaft used by the customer, a transfer shaft sleeve with a certain thickness is generally installed on the user shaft, and the inner and outer diameter thickness of the transfer shaft sleeve is used to adapt the gap between the encoder spindle and the user shaft. Although this solution is feasible, the transfer shaft sleeve will affect the connection stability between the encoder spindle and the user shaft, and the transfer shaft sleeve can only adapt to a specific size of user shaft, lacking flexibility and not universal. When the shaft used by the customer is replaced, the gap between the encoder spindle and the new shaft may change, and the transfer shaft sleeve of the corresponding thickness needs to be replaced to adapt to the new gap. In order to adapt to shafts of different sizes, it is necessary to prepare multiple transfer shaft sleeves of different thicknesses, or customize the transfer shaft sleeve according to the specific size of the user shaft. Each customization of the transfer shaft sleeve will incur additional design and manufacturing costs, especially if the demand is not large, the unit cost will be relatively high, and customized products require time to design, manufacture and test, which may lead to extended delivery time and affect the customer's project progress. Utility Model Content

[0004] In order to solve the above-mentioned problem, the utility model provides an encoder spindle with a variable inner diameter. By specially designing the spindle, the inner diameter of the upper end of the spindle can be adjusted so that it can adapt to the user's rotating shaft within a certain range, thereby achieving the purpose of variable diameter of the encoder spindle, solving the problem of the rotating shaft at the user end and the encoder spindle in the prior art, and improving the adaptability and standardization of the encoder spindle.

[0005] The utility model provides an encoder spindle with a variable inner diameter, comprising: a hollow shaft body for being mounted on a rotating shaft, one end of the hollow shaft body being connected to an elastic ring, a plurality of grooves being evenly distributed on the elastic ring along the axial direction, and a first thread being provided on the inner diameter surface of the elastic ring; and

[0006] The locking sleeve is used to be sleeved on the elastic ring. The locking sleeve is provided with a break and an adjusting mechanism for adjusting the inner diameter of the elastic ring. By adjusting the inner diameter of the elastic ring, the first thread is engaged with the second thread on the rotating shaft to fix the hollow shaft body on the rotating shaft.

[0007] Preferably, the minimum inner diameter of the locking sleeve is smaller than the maximum outer diameter of the elastic ring.

[0008] Preferably, the outer surface of the elastic ring is a conical surface.

[0009] Preferably, the outer surface of the elastic ring is provided with a necking structure for mounting the locking sleeve.

[0010] Preferably, a notch is provided on the outer diameter of the locking sleeve, a threaded through hole connected to a cross section on one side of the fracture is provided on the end face of the notch, a threaded blind hole corresponding in position is provided on the cross section on the other side of the fracture, and a bolt is screwed into the threaded through hole and the threaded blind hole in sequence to change the inner diameter size of the locking sleeve.

[0011] Preferably, a radial groove is formed on the inner diameter of the locking sleeve.

[0012] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0013] The utility model adopts a variable diameter design for the main shaft, so that the encoder main shaft can adapt to user shafts of different diameters within a certain range, thereby greatly improving the versatility and applicability of the encoder, and the main shaft of the utility model is connected to the user shaft through a threaded connection, which improves the installation stability of the main shaft and the user shaft; in addition, when there is a deviation in the processing accuracy of the user shaft, the main shaft of the utility model can also automatically adapt through its own deformation, thereby improving the tolerance to the deviation in the processing accuracy of the user shaft.

[0014] The utility model avoids the limitations of the existing solution of compensating the error between the encoder main shaft and the user's rotating shaft by using an adapter shaft sleeve. There is no need to customize the adapter shaft sleeve separately, which avoids delivery delays caused by waiting for the customized parts to be produced, thereby speeding up product delivery and reducing production costs.

[0015] The utility model also carries out a special design for the locking sleeve, so as to avoid introducing other adjustment or locking parts, and the inner diameter adjustment can be realized by using the locking sleeve itself and the bolt, thereby reducing the occupied space of the locking sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of a hollow shaft body provided according to an embodiment of the utility model;

[0017] Figure 2 This is a 45-degree top view of a hollow shaft provided according to an embodiment of the utility model;

[0018] Figure 3 It is a structural diagram of a locking sleeve provided according to an embodiment of the utility model;

[0019] Figure 4 It is an assembly diagram of an encoder spindle with a variable inner diameter and a user shaft provided according to an embodiment of the utility model.

[0020] Reference numerals include:

[0021] Hollow shaft body 1, elastic ring 2, groove 21, first thread 22, necking structure 23, locking sleeve 3, fracture 31, notch 32, threaded through hole 33, threaded blind hole 34, radial groove 35, rotating shaft 4. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present utility model will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and do not constitute a limitation of the utility model.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of the utility model provides an encoder spindle with a variable inner diameter, which is an improvement on the existing angle encoder spindle structure, and its specific structure includes:

[0025] Hollow shaft body 1, elastic ring 2 and locking sleeve 3, wherein the hollow shaft body 1 and the elastic ring 2 are integrally processed, the hollow shaft body 1 is in the shape of a hollow cylinder as a whole, and its lower end or outer surface can be adjusted and designed to adapt to various rotary encoders, and its inner diameter is used to fit on the user's rotary encoder such as Figure 4On the rotating shaft 4, the inner diameter size of the rotating shaft 4 used by the user is difficult to fully match the inner diameter size of the hollow shaft body 1. Even if it is mass-customized according to the size, due to processing errors or the non-uniform sizes of the user's multiple rotating shafts 4, there will inevitably be a gap when the hollow shaft body 1 is sleeved on the rotating shaft 4, making it impossible for the hollow shaft body 1 to be installed on the rotating shaft 4. Therefore, in the embodiment of the utility model, a section of elastic ring 2 is processed on the upper end of the hollow shaft body 1, and the inner diameter of the elastic ring 2 is the same as the inner diameter of the hollow shaft body 1. The thickness of the elastic ring 2 is less than or equal to the thickness of the hollow shaft body 1. It is usually necessary to process the elastic ring 2 to have a thickness less than the thickness of the hollow shaft body 1, so that the deformation capacity of the elastic ring 2 can be improved. The outer diameter surface of the elastic ring 2 is usually processed into a conical surface, and a first thread 22 is tapped on the inner diameter surface of the elastic ring 2. The first thread 22 needs to match the second thread 41 on the user's rotating shaft 4 for connecting with the encoder.

[0026] In order to adjust the inner diameter of the elastic ring 2, the embodiment of the utility model evenly opens a plurality of grooves 21 on the elastic ring 2 along the axial direction of the hollow shaft body 1. The more the number of grooves 21, the larger the adjustable range of the inner diameter of the elastic ring 2. However, when the number of grooves 21 reaches a certain number, as the number of grooves 21 continues to increase, the fixing strength between the elastic ring 2 and the rotating shaft 4 will decrease.

[0027] The outer surface of the elastic ring 2 is a conical surface, and a necking structure 23 is provided at the lower end of the outer surface of the elastic ring 2. The height of the necking structure 23 is slightly greater than the height of the locking sleeve 3, and the necking structure 23 is used to install the locking sleeve 3. The locking sleeve 3 is annular, and is provided with a fracture 31 and an adjustment mechanism. The adjustment mechanism is used to squeeze the distance between the two sections of the fracture 31, and then the inner diameter of the elastic ring 2 is adjusted, so that the first thread 22 on the inner diameter of the elastic ring 2 is engaged with the second thread 41 on the rotating shaft 4, and the hollow shaft body 1 is locked and fixed on the rotating shaft 4.

[0028] In order to reduce the space occupied by the adjustment mechanism, the utility model specially designs the adjustment mechanism and adjusts the structure of the locking sleeve 3. A radial notch 32 is provided at the position of the attachment of the fracture 31 of the locking sleeve 3. The radial cross section of the notch 32 is in a right-angle shape. A threaded through hole 33 communicating with the cross section on one side of the fracture 31 is provided on the end face of the notch 32. A threaded blind hole 34 corresponding to the position of the threaded through hole 33 is provided on the cross section on the other side of the fracture 31. A bolt is screwed into the threaded through hole 33 and the threaded blind hole 34 in sequence. The adjustment mechanism is composed of the threaded through hole 33, the threaded blind hole 34 and the bolt. The distance between the two cross sections of the fracture 31 is compressed by screwing in or out the bolt, thereby changing the inner diameter size of the locking sleeve 3 to adapt to the size of the rotating shaft 4 used by the user.

[0029] like Figure 4As shown, when the encoder with a variable inner diameter encoder spindle is installed on the user's rotating shaft 4, the locking sleeve 3 is sleeved on the necking structure 23 of the elastic ring 2, and the inner diameter of the locking sleeve 3 when no elastic deformation occurs is the maximum inner diameter. At this time, the locking sleeve 3 does not squeeze the elastic ring 2, and the elastic ring 2 does not undergo elastic deformation, and has the maximum inner diameter and outer diameter. When the distance between the two sections of the fracture 31 is adjusted to 0 by bolts, the inner diameter of the locking sleeve 3 is the minimum inner diameter. The minimum inner diameter of the locking sleeve 3 should be smaller than the maximum outer diameter of the elastic ring 2 when no deformation occurs, so that the locking sleeve 3 can effectively lock and fix the elastic ring 2. It should be noted that the maximum outer diameter of the elastic ring 2 here refers to the case where the inner diameter of the elastic ring 2 is not deformed. The minimum inner diameter of the locking sleeve 3 needs to be larger than the outer diameter at the installation position of the elastic ring 2. When the necking structure 23 is provided, it is larger than the outer diameter of the necking structure 23 when no deformation occurs.

[0030] When the user screws the rotating shaft 4 into the hollow shaft body 1, since the elastic ring 2 is surrounded by grooves 21, the elastic ring 2 will automatically adapt to the size of the user's rotating shaft 4. When the user screws the rotating shaft 4 into the correct position, the locking sleeve 3 is put on the elastic ring 2, and the bolts on the locking sleeve 3 are adjusted to adjust the inner diameter of the locking sleeve 3, thereby squeezing the elastic ring 2 inward, so that the inner diameter of the elastic ring 2 changes, and the first thread 22 on the inner diameter surface of the elastic ring 2 is fully engaged with the second thread 41 on the rotating shaft 4, thereby realizing the connection between the rotating shaft 4 and the encoder spindle, and the threaded connection method is adopted, which has higher stability and reliability.

[0031] In addition, in order to improve the deformation ability of the locking sleeve 3 and avoid the deformation of the locking sleeve 3 and the stress it is subjected to being concentrated near the notch 32, a radial groove 35 can be opened on the inner diameter of the locking sleeve 3. The position of the radial groove 35 should form a central angle of 180 degrees with the fracture 31, which can balance the stress on the locking sleeve 3.

[0032] The utility model effectively solves the problem that the inner diameter of the rotating shaft 4 used by the user does not match that of the encoder main shaft. The encoder main shaft with a variable inner diameter can adapt to the size of the user's rotating shaft 4 within a certain range, thereby improving the market competitiveness of the encoder.

[0033] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0034] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An encoder spindle with a variable inner diameter, characterized in that: include: A hollow shaft body used for being mounted on the rotating shaft, one end of the hollow shaft body being connected to an elastic ring, a plurality of grooves being evenly distributed on the elastic ring along the axial direction, and a first thread being provided on the inner diameter surface of the elastic ring; and A locking sleeve is used to be mounted on the elastic ring, and the locking sleeve is provided with a break and an adjustment mechanism for adjusting the inner diameter of the elastic ring. By adjusting the inner diameter of the elastic ring, the first thread is engaged with the second thread on the rotating shaft, and the hollow shaft body is fixed on the rotating shaft.

2. The encoder spindle with a variable inner diameter as claimed in claim 1, characterized in that: The minimum inner diameter of the locking sleeve is smaller than the maximum outer diameter of the elastic ring.

3. The encoder spindle with a variable inner diameter as claimed in claim 1, characterized in that: The outer surface of the elastic ring is a conical surface.

4. The encoder spindle with a variable inner diameter according to claim 1 or 3, characterized in that: The outer surface of the elastic ring is provided with a necking structure for mounting the locking sleeve.

5. The encoder spindle with a variable inner diameter as claimed in claim 1, characterized in that: A notch is provided on the outer diameter of the locking sleeve, a threaded through hole connected to a cross section on one side of the fracture is provided on the end face of the notch, and a threaded blind hole corresponding to the position is provided on the cross section on the other side of the fracture, and the inner diameter size of the locking sleeve is changed by screwing a bolt into the threaded through hole and the threaded blind hole in sequence.

6. The encoder spindle with a variable inner diameter according to claim 1 or 5, characterized in that: A radial groove is formed on the inner diameter of the locking sleeve.

Images