Harmonic reducer input shaft and cross bearing concentricity detection device and use method thereof

Abstract

The invention provides a harmonic reducer input shaft and cross bearing concentricity detection device and a use method thereof, the harmonic reducer input shaft and cross bearing concentricity detection device can be used for harmonic reducer input shaft and cross bearing concentricity detection, and the device is simple in structure and convenient to produce, assemble and use. The device structurally comprises a mounting assembly and a detection assembly, the mounting assembly comprises a mounting seat, the mounting seat is used for mounting the harmonic reducer, the detection assembly comprises a contact type detection device, the mounting assembly further comprises a connecting shaft, a mounting hole is formed in the middle of the mounting seat, the connecting shaft is rotationally connected in the mounting hole, and the detection assembly comprises a plunger, a measuring rod and a connecting bolt. The plunger and the connecting shaft are coaxially arranged with the position, used for installing the input shaft, of the harmonic reducer, the plunger and the connecting shaft are fixedly connected through a connecting bolt, the plunger is connected with the measuring rod, a contact type detection device is installed on the measuring rod, and a probe of the contact type detection device is located on an outer ring of a crossed bearing on the periphery of the harmonic reducer.

Description

Technical Field

[0001] This invention relates to the field of harmonic reducer testing technology, specifically to a device for detecting the concentricity of the input shaft and cross bearing of a harmonic reducer and its usage method. Background Technology

[0002] Harmonic reducers mainly consist of an internal gear, a flexible gear, and a wave generator. They utilize the flexible gear to generate controllable elastic deformation waves, causing relative tooth misalignment between the gear teeth to transmit power and motion. The input shaft, serving as the power input, is connected to the wave generator, which in turn drives the wave generator to rotate. The wave generator then drives the flexible gear, which in turn drives the cross bearing, the output end, which is mounted on the outer circumference of the harmonic reducer. During manufacturing, it is necessary to check the concentricity of the input and output ends, specifically the concentricity of the input shaft and the cross bearing. Currently, the primary method for measuring concentricity is using a coordinate measuring machine (CMM). The advantage of a CMM is that it can measure all models without requiring auxiliary tooling. However, its disadvantages are also obvious: firstly, it is too expensive; secondly, it is a measuring instrument designed for all company products, not a specialized instrument; and thirdly, it requires highly skilled operators with experience in operating the equipment.

[0003] There are also devices for testing harmonic reducers, such as the axial and radial runout detection device for harmonic reducers disclosed in patent CN110530309A. This device detects radial runout by installing a contact sensor on the outer periphery of the harmonic reducer and rotating the harmonic reducer through an air bearing rotating platform. However, this type of detection device has a relatively complex structure and is inconvenient to manufacture. In addition, it can only detect radial runout and cannot detect the concentricity of the input shaft and the cross bearing mentioned above. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a device for detecting the concentricity of the input shaft and cross bearing of a harmonic reducer, along with a method for using it. The device is simple in structure and easy to manufacture, assemble, and use.

[0005] The technical solution is as follows: a concentric detection device for the input shaft and cross bearing of a harmonic reducer, comprising an installation assembly and a detection assembly. The installation assembly includes a mounting base for mounting the harmonic reducer. The detection assembly includes a contact detection device. The installation assembly further includes a connecting shaft. The mounting base has a mounting hole in the middle, and the connecting shaft is rotatably connected within the mounting hole. The detection assembly includes a plunger, a measuring rod, and a connecting bolt. The plunger and the connecting shaft are coaxially arranged with the position on the harmonic reducer where the input shaft is mounted. The plunger and the connecting shaft are fixedly connected by the connecting bolt and clamp the harmonic reducer from both the upper and lower ends. The plunger is connected to the measuring rod, and the contact detection device is mounted on the measuring rod. The probe of the contact detection device is located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer.

[0006] Furthermore, the top of the connecting shaft has a first connecting hole, the middle of the plunger has a second connecting hole, the middle of the harmonic reducer has a stepped hole for installing the input shaft, the bottom of the plunger and the top of the connecting shaft respectively contact the plane inside the stepped hole from the top and bottom ends, and the connecting bolt passes through the second connecting hole and the stepped hole and is threaded to the first connecting hole.

[0007] Furthermore, the measuring rod has a connecting hole three in the middle, and the connecting bolt passes through the connecting hole three, with the head of the connecting bolt pressing against the measuring rod.

[0008] Furthermore, the mounting base has a recessed groove in the middle that corresponds to the outer circumferential dimensions of the harmonic reducer under test, for positioning the harmonic reducer; the connecting shaft is connected to the mounting hole via a rolling bearing, the bottom of the mounting hole has a recessed mounting base for supporting the rolling bearing, and a bearing cover plate is connected to the top of the mounting hole to prevent the rolling bearing from dislodging from the mounting hole; the middle of the connecting shaft protrudes outward to form a limiting part, and the upper and lower ends of the limiting part are in contact with the rolling bearing respectively.

[0009] A method for using the above-mentioned harmonic reducer input shaft and cross bearing concentricity detection device, characterized in that it includes the following steps: Step 1: Pre-install the connecting shaft on the mounting base;

[0010] Step 2: Select the appropriate mounting base according to the harmonic reducer, place the harmonic reducer on the mounting base, and make the top of the connecting shaft contact the bottom of the wave generator in the middle of the harmonic reducer.

[0011] Step 3: Place the bottom of the plunger in contact with the top of the wave generator. The axis of the plunger and the connecting shaft should be coaxial with the position where the input shaft of the wave generator is installed. Place the measuring rod on the plunger. Pass the connecting bolt through the measuring rod and the plunger in sequence and then thread it onto the connecting shaft. Tightening the connecting bolt will press the plunger and the connecting shaft onto the upper and lower ends of the wave generator, respectively.

[0012] Step 4: Adjust the contact detection device connected to the measuring rod so that its probe is located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer;

[0013] Step 5: Rotate the measuring rod to make the plunger and connecting shaft rotate together, and at the same time make the probe of the contact detection device rotate at least one revolution relative to the outer ring of the cross bearing. Observe the reading to measure the concentricity of the input shaft and the cross bearing.

[0014] Furthermore, in step 1, the bottom of the connecting shaft extends out of the mounting seat and connects with the horizontally extending auxiliary bolt, and in step 3, the connecting bolt is tightened by holding the auxiliary bolt.

[0015] Beneficial effects: (1) Simple operation. Since the mounting base is pre-assembled for each harmonic product, you only need to put in the plunger and measuring rod and tighten the bolts to fix it; for operators, simple training is all that is needed to start working.

[0016] (2) Low overall cost. The overall structure is simple and the components are easy to customize, resulting in a lower manufacturing cost compared to existing devices.

[0017] (3) After comparing the measurement results with those of a coordinate measuring machine, it can completely replace the coordinate measuring machine. Because the device is small in size and light in weight, it can be placed on a table and measured anytime and anywhere. It is also easy to move and maintain. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the present invention. Detailed Implementation

[0020] like Figure 1 , Figure 2The harmonic reducer input shaft and cross bearing concentric detection device shown includes a mounting assembly and a detection assembly. The mounting assembly includes a mounting base 1 for mounting the harmonic reducer 2. The detection assembly includes a contact detection device 3. The mounting assembly also includes a connecting shaft 4. The mounting base 1 has a mounting hole in the middle, and the connecting shaft 4 is rotatably connected in the mounting hole. The detection assembly includes a plunger 5, a measuring rod 6, and a connecting bolt 7. The plunger 5 and the connecting shaft 4 are coaxially arranged with the position on the harmonic reducer 2 where the input shaft is mounted. The plunger 5 and the connecting shaft 4 are fixedly connected by the connecting bolt 7 and clamp the harmonic reducer 2 from the upper and lower ends, respectively. The plunger 5 is connected to the measuring rod 6, and these two can also be integrally formed. The contact detection device 3 is mounted on the measuring rod 6. The contact detection device 3 can be a lever dial indicator, or an ordinary dial indicator can be additionally mounted by a bracket, with its probe located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer 2.

[0021] Specifically, the connecting shaft 4 has a connecting hole 1 at the top, the plunger 5 has a connecting hole 2 in the middle, the harmonic reducer 2 has a stepped hole in the middle for installing the input shaft, the bottom of the plunger 5 and the top of the connecting shaft 4 contact the plane inside the stepped hole from the top and bottom ends respectively, the connecting bolt 7 passes through the connecting hole 2 and the stepped hole and is threaded to the connecting hole 1, the measuring rod 6 may also have a connecting hole 3 in the middle, the connecting bolt 7 also passes through the connecting hole 3, and the head of the connecting bolt 7 presses on the measuring rod 6. With this structure, the assembly of the detection device can be completed by tightening the connecting bolt 7, which is convenient for use.

[0022] In addition, regarding the specific structure of the mounting base 1, the middle part of the mounting base 1 is recessed to form a receiving groove corresponding to the outer circumferential size of the harmonic reducer 2 to be tested, which is used to position the harmonic reducer 2; the connecting shaft 4 is connected to the mounting hole through the rolling bearing 8, the bottom of the mounting hole is recessed to form a mounting seat for supporting the rolling bearing 8, and the top of the mounting hole is connected to a bearing cover plate 9 to prevent the rolling bearing 8 from falling out of the mounting hole. The middle part of the connecting shaft 4 protrudes outward to form a limiting part, and the upper and lower ends of the limiting part are in contact with the rolling bearing 8 respectively.

[0023] When in use, it includes the following steps: Step 1: Pre-install the connecting shaft 4 on the mounting base 1.

[0024] Step 2: Select the appropriate mounting base 1 according to the specifications of the harmonic reducer 2, place the harmonic reducer 2 on the mounting base 1, and make the top of the connecting shaft 4 contact the bottom of the wave generator in the middle of the harmonic reducer 2.

[0025] Step 3: Place the bottom of the plunger 5 in contact with the top of the wave generator. The axis of the plunger 5 and the connecting shaft 4 should be coaxial with the position of the input shaft of the wave generator. Place the measuring rod 6 on the plunger 5. Then, thread the connecting bolt 7 through the measuring rod 6 and the plunger 5 in sequence and connect it to the connecting shaft 4. Tightening the connecting bolt 7 will press the plunger 5 and the connecting shaft 4 onto the upper and lower ends of the wave generator, respectively.

[0026] Step 4: Adjust the contact detection device 3 connected to the measuring rod 6 via the single chuck 10 so that its probe is located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer 2.

[0027] Step 5: Rotate the measuring rod 6 to drive the plunger 5 and the connecting shaft 4 to rotate together. At the same time, make the probe of the contact detection device 3 rotate at least one revolution relative to the outer ring of the cross bearing and observe the reading. This will measure the concentricity of the input shaft and the cross bearing. For example, if the pointer jumps between 30 and 32, the concentricity between the two is 2μm.

[0028] In addition, for ease of use, in step 1, the bottom of the connecting shaft 4 extends out of the mounting base 1 and is connected to the horizontally extending auxiliary bolt 11. In step 3, the connecting bolt 7 is tightened by holding the auxiliary bolt 11.

[0029] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A concentricity detection device for the input shaft and crossed bearing of a harmonic reducer, comprising a mounting assembly and a detection assembly, wherein the mounting assembly includes a mounting base for mounting the harmonic reducer, and the detection assembly includes a contact detection device, characterized in that: The mounting assembly further includes a connecting shaft. The mounting base has a mounting hole in the middle, and the connecting shaft is rotatably connected in the mounting hole. The detection assembly includes a plunger, a measuring rod, and a connecting bolt. The plunger and the connecting shaft are coaxially arranged with the position on the harmonic reducer for mounting the input shaft. The plunger and the connecting shaft are fixedly connected by the connecting bolt and clamp the harmonic reducer from the upper and lower ends, respectively. The plunger is connected to the measuring rod, and the contact detection device is mounted on the measuring rod. The probe of the contact detection device is located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer.

2. The concentricity detection device for the input shaft and crossed bearing of the harmonic reducer according to claim 1, characterized in that: The connecting shaft has a connecting hole one at the top, the plunger has a connecting hole two in the middle, and the harmonic reducer has a stepped hole in the middle for installing the input shaft. The bottom of the plunger and the top of the connecting shaft contact the plane inside the stepped hole from the top and bottom ends, respectively. The connecting bolt passes through the connecting hole two and the stepped hole and is threaded to the connecting hole one.

3. The concentricity detection device for the input shaft and crossed bearing of the harmonic reducer according to claim 2, characterized in that: The measuring rod has a connecting hole three in the middle, and the connecting bolt also passes through the connecting hole three, with the head of the connecting bolt pressing on the measuring rod.

4. The concentricity detection device for the input shaft and crossed bearing of the harmonic reducer according to claim 1, characterized in that: The mounting base has a recessed center forming a receiving groove corresponding to the outer circumferential dimensions of the harmonic reducer under test, used for positioning the harmonic reducer; the connecting shaft is connected to the mounting hole via a rolling bearing, the bottom of the mounting hole has a recessed center forming a mounting base for supporting the rolling bearing, the top of the mounting hole is connected to a bearing cover plate to prevent the rolling bearing from dislodging from the mounting hole, the middle of the connecting shaft protrudes outward to form a limiting part, the upper and lower ends of the limiting part are in contact with the rolling bearing respectively.

5. A method of using the concentricity detection device for the input shaft and crossed bearing of a harmonic reducer according to any one of claims 1-4, characterized in that, It includes the following steps: Step 1: Pre-install the connecting shaft on the mounting base; Step 2: Select the appropriate mounting base according to the harmonic reducer, place the harmonic reducer on the mounting base, and make the top of the connecting shaft contact the bottom of the wave generator in the middle of the harmonic reducer. Step 3: Place the bottom of the plunger in contact with the top of the wave generator. The axis of the plunger and the connecting shaft should be coaxial with the position where the input shaft of the wave generator is installed. Place the measuring rod on the plunger. Pass the connecting bolt through the measuring rod and the plunger in sequence and then thread it onto the connecting shaft. Tightening the connecting bolt will press the plunger and the connecting shaft onto the upper and lower ends of the wave generator, respectively. Step 4: Adjust the contact detection device connected to the measuring rod so that its probe is located on the outer ring of the cross bearing on the outer periphery of the harmonic reducer; Step 5: Rotate the measuring rod to make the plunger and connecting shaft rotate together, and at the same time make the probe of the contact detection device rotate at least one revolution relative to the outer ring of the cross bearing. Observe the reading to measure the concentricity of the input shaft and the cross bearing.

6. The method of using the concentricity detection device for the input shaft and crossed bearing of the harmonic reducer according to claim 5, characterized in that: In step 1, the bottom of the connecting shaft extends out of the mounting seat and connects with the horizontally extending auxiliary bolt. In step 3, the connecting bolt is tightened by holding the auxiliary bolt.

Images