Two-stage clamp device for full-automatic balancing machine

Abstract

The utility model discloses a two-stage clamp device for a full-automatic balancing machine. The first-stage expansion sleeve is fixedly connected to the top of the second-stage expansion sleeve, the bottom of the second-stage expansion sleeve is connected with the thrust component, the thrust component is used for providing upward thrust for the second-stage expansion sleeve, the clamp device is installed on a main shaft rotary table of an external testing machine, the first-stage expansion sleeve and the second-stage expansion sleeve are both attached to a workpiece to be clamped, and then high-precision positioning and clamping of the workpiece are achieved. The first-stage cone base and the first-stage collet chuck are tightly attached under the tension effect of the first spring, the second-stage cone base and the second-stage collet chuck are tightly attached under the restoring force effect of the second spring, the wall faces of the first-stage collet chuck and the second-stage collet chuck expand outwards, and then the two-stage expansion sleeve is tightly attached to the two positioning faces of a workpiece. The device provided by the utility model is simple to manufacture, high in balance test sensitivity and capable of clamping a workpiece with two clamping and positioning surfaces.

Description

Technical Field

[0001] The utility model belongs to the technical field of balancing machines, and in particular relates to a two-stage clamp device for a full-automatic balancing machine. Background Art

[0002] With the rapid development of modern industrial manufacturing technology, the requirements for product precision and quality are increasing. As key equipment in modern manufacturing, fully automatic balancing machines play a vital role in improving product quality, reducing vibration and noise, and extending equipment life. During the operation of a fully automatic balancing machine, the performance of the fixture, a crucial tool for securing and supporting the workpiece, directly impacts the accuracy and efficiency of balancing corrections.

[0003] Some existing workpieces (such as the dynamic transmission cylinder) have two clamping and positioning surfaces separated by a relatively large axial distance. During fully automated testing and correction, both surfaces must be clamped and positioned simultaneously, requiring high clamping stability between the fixture and the clamping surfaces to ensure measurement accuracy and correction effectiveness. The existing patent (201810974621.8 Automatic Centering and Grading Clamping Device for Dual-Mass Flywheels in Fully Automatic Balancing Machines) utilizes an integrated pull rod A10, which makes fine-tuning the stroke difficult with two clamping cycles. The fixture is clamped when the cylinder maintains continuous power output, introducing interference from cylinder force during dynamic balancing tests and affecting test results. Currently, foreign fixtures are expensive and heavy, impacting the sensitivity of dynamic balancing tests. The prior art lacks a two-stage fixture with two clamping and positioning surfaces for fully automatic balancing machines. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide a two-stage clamp device for a fully automatic balancing machine.

[0005] The technical solution adopted by this utility model is:

[0006] The device includes a primary expansion sleeve, a secondary expansion sleeve and a thrust component. The primary expansion sleeve is fixed to the top of the secondary expansion sleeve, and the bottom of the secondary expansion sleeve is connected to the thrust component. The thrust component is used to provide an upward thrust to the secondary expansion sleeve. The clamping device is installed on the spindle turntable of the external testing machine. The primary expansion sleeve and the secondary expansion sleeve are both in contact with the workpiece to be clamped, thereby realizing the positioning and clamping of the workpiece.

[0007] The first-level expansion sleeve includes an annular first-level cone seat, a first-level collet, a first-level guide pressure cover, a first spring, a spring pressure plate, a nut and a support ring; the bottom of the support ring is fixedly connected to the bottom of the first-level cone seat, and there is a gap between the outer wall of the first-level cone seat and the inner wall of the support ring. The first-level collet can be movably sleeved on the outer periphery of the first-level cone seat, and the bottom of the first-level collet is located in the gap between the first-level cone seat and the support ring. The lower part of the first-level guide pressure cover extends into the middle part of the annular first-level cone seat and fits tightly with the inner wall of the first-level cone seat. The bottom end of the cover is connected to the nut through a thread, the spring pressure plate is located above the nut and is movably mounted on the outer periphery of the first-level guide pressure cover. An annular first groove is provided at the lower part of the first-level cone seat, and an annular first spring is installed in the first groove. The upper and lower ends of the first spring are in contact with the first-level cone seat and the spring pressure plate respectively, and the inner side wall of the top of the first-level collet is in contact with the outer side wall of the middle part of the first-level guide pressure cover to transmit push and pull force between the first-level collet and the first-level guide pressure cover; the first-level cone seat and the connecting piece in the second-level expansion sleeve are fixedly connected.

[0008] The secondary expansion sleeve includes a secondary conical seat, a secondary collet, a secondary guide rod, a pressure cover, a second spring, a connecting piece and an adjusting rod; the secondary collet sleeve is arranged on the outer periphery of the secondary conical seat, the bottom of the connecting piece is fixed to the inner periphery of the secondary conical seat, the upper part of the secondary guide rod extends into the through hole in the middle of the connecting piece and fits tightly with the inner wall of the connecting piece, the top of the secondary guide rod is connected to the adjusting rod by a thread, and an annular fourth groove is opened at the lower part of the connecting piece, and an annular second spring is installed in the fourth groove. The upper and lower ends of the second spring are respectively in contact with the connecting piece and the secondary guide rod, and the outer periphery of the bottom of the secondary guide rod is connected with an annular pressure cover, and the inner side wall of the top of the secondary collet contacts the outer side wall of the pressure cover to transmit push and pull force between the secondary collet and the pressure cover; the top of the connecting piece is fixedly connected to the primary conical seat in the secondary expansion sleeve, and the secondary conical seat is installed on the spindle turntable of the external testing machine.

[0009] The thrust component includes a cylinder and a connecting unit. The cylinder is installed in the connecting unit. The connecting unit is connected to the secondary conical seat in the secondary expansion sleeve. The push rod of the cylinder passes through the opening in the middle of the secondary conical seat and contacts the secondary guide rod in the secondary expansion sleeve. The cylinder is used to provide an upward thrust to the secondary guide rod.

[0010] The outer wall and inner wall of the first-level cone seat are respectively provided with a first-level cone seat positioning surface and a guide hole, the outer wall and inner wall of the first-level collet are respectively provided with a first-level collet cylindrical surface and a first-level collet positioning surface, the middle part of the outer wall surface of the first-level guide pressure cover is provided with a first guide cylindrical surface, the guide hole of the first-level cone seat and the first guide cylindrical surface of the first-level guide pressure cover are clearance-fitted, and during the process of screwing the nut with the first-level guide pressure cover thread, the first-level cone seat positioning surface of the first-level cone seat and the first-level collet positioning surface of the first-level collet are tightly fitted under the action of the first spring restoring force, and the first-level collet cylindrical surface of the first-level collet expands outward, thereby making the first expansion sleeve tightly fit with the first positioning surface of the workpiece.

[0011] The outer wall of the secondary cone seat is provided with a secondary cone seat positioning surface, the outer wall and inner wall of the secondary collet are respectively provided with a secondary collet cylindrical surface and a secondary collet positioning surface, the middle part of the outer wall surface of the secondary guide rod is provided with a second guide cylindrical surface, the guide hole provided in the connecting piece and the second guide cylindrical surface of the secondary guide rod are clearance-matched, the secondary cone seat positioning surface of the secondary cone seat and the secondary collet positioning surface of the secondary collet are tightly fitted under the action of the second spring restoring force, the secondary collet cylindrical surface of the secondary collet expands outward, thereby making the secondary expansion sleeve tightly fit with the second positioning surface of the workpiece.

[0012] The first-level expansion sleeve also includes a first-level outer expansion sleeve, which is movably mounted on the outer periphery of the first-level collet, and the bottom of the first-level outer expansion sleeve is located in the gap between the first-level cone seat and the support ring. The inner wall and outer wall of the first-level outer expansion sleeve are respectively provided with an expansion sleeve inner conical surface 1 and an expansion sleeve clamping surface 1. When the device clamps and positions the workpiece, the first-level collet cylindrical surface of the first-level collet and the expansion sleeve inner conical surface 1 of the first-level outer expansion sleeve are tightly fitted under the action of the first spring restoring force, and the expansion sleeve clamping surface 1 of the first-level outer expansion sleeve expands outward, thereby making the expansion sleeve clamping surface 1 tightly fit with the first positioning surface of the workpiece.

[0013] The secondary expansion sleeve also includes a secondary outer expansion sleeve. The annular secondary outer expansion sleeve is arranged on the outer periphery of the secondary collet. The inner wall and outer wall of the secondary outer expansion sleeve are respectively provided with an expansion sleeve inner conical surface 2 and an expansion sleeve clamping surface 2. When the device clamps and positions the workpiece, the secondary collet cylindrical surface of the secondary collet and the expansion sleeve inner conical surface 2 of the secondary outer expansion sleeve are tightly fitted under the action of the second spring restoring force, and the expansion sleeve clamping surface 2 of the secondary outer expansion sleeve expands outward, thereby making the expansion sleeve clamping surface 2 tightly fit with the second positioning surface of the workpiece.

[0014] The first-level expansion sleeve is also provided with an anti-rotation pin, and the top of the first-level cone seat and the bottom of the first-level guide cover are both provided with an annular second groove at the same position, an anti-rotation pin is provided between the first-level cone seat and the second groove of the first-level guide cover, an annular third groove is provided on the top of the first-level guide cover, and an anti-rotation pin is provided between the third groove of the first-level guide cover and the top of the first-level collet.

[0015] The beneficial effects of the utility model are:

[0016] 1. The device of the utility model has a compact and lightweight structure, low cost, and can achieve high-precision and stable clamping of workpieces with two clamping and positioning surfaces.

[0017] 2. When the cylinder force is disengaged, the fixture of the utility model adaptively clamps the workpiece to perform a dynamic balance test. The dynamic balance test process does not introduce interference from the cylinder force, and the test sensitivity is high.

[0018] 3. The utility model adopts multiple split components such as cylinder, secondary guide rod, adjustment rod and primary guide cover to carry out contact force transmission. For different workpieces, individual components can be replaced, which has a wide range of applications and is easy to change.

[0019] 4. The secondary guide rod of the utility model is connected to the adjustment rod through a thread, and the stroke can be fine-tuned by adjusting the screw-in depth of the thread, which is convenient for installation and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the overall structural diagrams of Example 1;

[0021] Figure 2 This is the second overall structural diagram of the first embodiment;

[0022] Figure 3 This is the third overall structural diagram of the first embodiment;

[0023] Figure 4 This is a schematic diagram of the first-level expansion sleeve structure of Example 1;

[0024] Figure 5 This is a schematic diagram of the secondary expansion sleeve structure of Example 1;

[0025] Figure 6 This is one of the schematic diagrams of the thrust component of Example 1;

[0026] Figure 7 This is the second schematic diagram of the thrust component of the first embodiment;

[0027] Figure 8 This is one of the overall structural diagrams of Example 2;

[0028] Figure 9 This is the second overall structural diagram of the second embodiment;

[0029] Figure 10 This is the third overall structural diagram of the second embodiment;

[0030] Figure 11 This is a schematic diagram of the first-level expansion sleeve structure of Example 2;

[0031] Figure 12 This is a schematic diagram of the secondary expansion sleeve structure of Example 2.

[0032] In the figure: A0, first-stage expansion sleeve; B0, second-stage expansion sleeve; C0, thrust component; D0, spindle turntable; E0, workpiece; A1, first-stage cone seat; A2, first-stage collet; A3, first-stage guide pressure cover; A4, first spring; A5, spring pressure plate; A6, nut; A7, support ring; A8, anti-rotation pin; A9, first-stage external expansion sleeve; B1, second-stage cone seat; B2, second-stage collet; B3, second-stage guide rod; B4, pressure cover; B5, second spring; B6, connector; B7, adjusting rod; B8, guide key; B9, second-stage external expansion sleeve; C1, cylinder; C1.1, push rod; C2 connector unit; A1.1, first external cone; A1.2, guide hole; A1.3, first positioning cylinder; A2.1, first internal Conical surface; A2.2, first clamping surface; A2.3, first collet conical surface; A3.1, first guide cylindrical surface; A3.2, first thread; A6.1, second thread; A9.1, first inner conical surface of the expansion sleeve; A9.2, first clamping surface of the expansion sleeve; B1.1, second outer conical surface; B1.3, second positioning cylindrical surface; B2.1, second inner conical surface; B2.2, second clamping surface; B2.3, second collet conical surface; B3.1, second guide cylindrical surface; B3.2, third thread; B7.1, spherical surface; B7.2, fourth thread; B9.1, second inner conical surface of the expansion sleeve; B9.2, second clamping surface of the expansion sleeve; E0.1, first plane; E0.2, second plane; E0.3, first conical surface; E0.4, second conical surface. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to specific implementation cases. The following implementation cases will help those skilled in the art to further understand the present invention, but will not limit the present invention in any form.

[0034] like Figure 1-3 As shown, the fixture device includes a primary expansion sleeve A0, a secondary expansion sleeve B0, and a thrust member C0. The primary expansion sleeve A0 is fixed to the top of the secondary expansion sleeve B0, and the bottom of the secondary expansion sleeve B0 is connected to the thrust member C0. The thrust member C0 is used to provide an upward thrust to the secondary expansion sleeve B0. The fixture device is installed on the spindle turntable D0 of the external testing machine. The primary expansion sleeve A0 and the secondary expansion sleeve B0 both fit the workpiece E0 to be clamped, thereby achieving high-precision positioning and clamping of the workpiece E0. Specifically, when the workpiece E0 is positioned and clamped, the primary expansion sleeve A0 and the secondary expansion sleeve B0 fit the first and second positioning surfaces of the workpiece E0, respectively.

[0035] like Figure 4As shown, the first-level expansion sleeve A0 includes an annular first-level cone seat A1, a first-level collet A2, a first-level guide pressure cover A3, a first spring A4, a spring pressure plate A5, a nut A6 and a support ring A7; the bottom of the support ring A7 is fixedly connected to the bottom of the first-level cone seat A1, and there is a gap between the outer wall of the first-level cone seat A1 and the inner wall of the support ring A7, the first-level collet A2 is movably sleeved on the outer periphery of the first-level cone seat A1, and the bottom of the first-level collet A2 is located in the gap between the first-level cone seat A1 and the support ring A7, and the lower part of the first-level guide pressure cover A3 with a T-shaped cross section extends into the middle part of the annular first-level cone seat A1 and is tightly attached to the inner wall of the first-level cone seat A1. The bottom end of the first-level guide cover A3 is connected to the nut A6 through a thread, and the spring pressure plate A5 is located above the nut A6 and is movably mounted on the outer periphery of the bottom of the first-level guide cover A3. An annular first groove is provided at the lower part of the first-level cone seat A1, and an annular first spring A4 is installed in the first groove. The upper and lower ends of the first spring A4 are in contact with the first-level cone seat A1 and the spring pressure plate A5 respectively. The inner side wall of the top of the first-level collet A2 is in contact with the outer side wall of the middle part of the first-level guide cover A3 to transmit push and pull force between the first-level collet A2 and the first-level guide cover A3; the first-level cone seat A1 and the connecting piece B6 in the second-level expansion sleeve B0 are fixedly connected.

[0036] like Figure 5 As shown, the secondary expansion sleeve B0 includes a secondary cone seat B1, a secondary collet B2, a secondary guide rod B3, a pressure cover B4, a second spring B5, a connecting piece B6 and an adjusting rod B7; the secondary collet B2 is relatively movably sleeved on the outer periphery of the secondary cone seat B1, the bottom of the connecting piece B6 is fixed to the inner periphery of the secondary cone seat B1 by bolts, a through hole is opened in the middle of the connecting piece B6, the upper part of the secondary guide rod B3 with an inverted T-shaped cross section extends into the through hole in the middle of the connecting piece B6 and fits tightly with the inner wall of the connecting piece B6, and the top of the secondary guide rod B3 is threadedly connected to the adjusting rod B7 through a thread. The lower portion of the connector B6 defines an annular fourth groove, within which an annular second spring B5 is mounted. The upper and lower ends of the second spring B5 contact the connector B6 and the bottom of the secondary guide rod B3, respectively. The outer periphery of the bottom of the secondary guide rod B3 is bolted to an annular pressure cap B4. The inner sidewall of the top of the secondary collet B2 contacts the outer sidewall of the pressure cap B4 to transmit push and pull forces between the collet B2 and the pressure cap B4. The top of the connector B6 is fixedly connected to the primary conical seat A1 in the primary expansion sleeve A0, which is mounted on the spindle turntable D0 of the external testing machine. The secondary expansion sleeve B0 also includes a guide key B8, located below the secondary collet B2 and mounted on the sidewall of the lower portion of the secondary conical seat B1. The guide key B8 is used to limit the rotational freedom of the secondary collet B2.

[0037] like Figure 6 and Figure 7As shown, the thrust component C0 includes a cylinder C1 and a connecting unit C2. The cylinder C1 is installed in the connecting unit C2. The connecting unit C2 is connected to the secondary conical seat B1 in the secondary expansion sleeve B0. The push rod C1.1 of the cylinder C1 passes through the opening in the middle of the secondary conical seat B1 and contacts the secondary guide rod B3 in the secondary expansion sleeve B0. The cylinder C1 is used to provide an upward thrust to the secondary guide rod B3.

[0038] The outer wall and inner wall of the first-level cone seat A1 are respectively provided with a first-level cone seat positioning surface and a guide hole A1.2, and the first-level collet A2 adopts elastic material (or elastic structure), and the outer wall and inner wall of the first-level collet A2 are respectively provided with a first-level collet cylinder and a first-level collet positioning surface, and the diameter of the first-level collet cylinder is slightly smaller than the first positioning surface of the workpiece E0 in the contracted state, and the middle part of the outer wall surface of the first-level guide pressure cover A3 is provided with a first guide cylinder A3.1, and there is a clearance fit between the guide hole A1.2 of the first-level cone seat A1 and the first guide cylinder A3.1 of the first-level guide pressure cover A3. In the process of screwing the nut A6 with the bottom thread of the first-level guide pressure cover A3, the first-level cone seat positioning surface of the first-level cone seat A1 and the first-level collet positioning surface of the first-level collet A2 are tightly fitted under the action of the restoring force of the first spring A4, and the first-level collet cylinder of the first-level collet A2 expands outward, thereby making the first expansion sleeve A0 tightly fit with the first positioning surface of the workpiece E0.

[0039] The outer wall of the secondary conical seat B1 is provided with a secondary conical seat positioning surface, and the secondary collet B2 adopts elastic material (or elastic structure). The outer wall and inner wall of the secondary collet B2 are respectively provided with a secondary collet cylinder and a secondary collet positioning surface. The diameter of the secondary collet cylinder is slightly smaller than the second positioning surface of the workpiece E0 in the contracted state. A guide hole is provided on the inner side wall of the connecting part B6, and a second guide cylinder B3.1 is provided in the middle part of the outer wall of the secondary guide rod B3. There is a clearance fit between the guide hole set in the connecting part B6 and the second guide cylinder B3.1 of the secondary guide rod B3. There is a pre-tightening force in the second spring B5. The secondary conical seat positioning surface of the secondary conical seat B1 and the secondary collet positioning surface of the secondary collet B2 are tightly fitted under the action of the restoring force of the second spring B5, and the secondary collet cylinder B2.2 of the secondary collet B2 expands outward, so that the secondary expansion sleeve B0 is tightly fitted with the second positioning surface of the workpiece E0.

[0040] like Figure 8-11As shown, the first-level expansion sleeve A0 also includes a first-level outer expansion sleeve A9, which is movably mounted on the outer periphery of the first-level collet A2, and the bottom of the first-level outer expansion sleeve A9 is located in the gap between the first-level cone seat A1 and the support ring A7. The inner wall and outer wall of the first-level outer expansion sleeve A9 are respectively provided with an expansion sleeve inner conical surface A9.1 and an expansion sleeve clamping surface A9.2. When the device clamps and positions the workpiece E0, the first-level collet cylindrical surface of the first-level collet A2 and the expansion sleeve inner conical surface A9.1 of the first-level outer expansion sleeve A9 are tightly fitted under the action of the restoring force of the first spring A4, and the expansion sleeve clamping surface A9.2 of the first-level outer expansion sleeve A9 expands outward, thereby making the expansion sleeve clamping surface A9.2 tightly fit with the first positioning surface of the workpiece E0.

[0041] like Figure 12 As shown, the secondary expansion sleeve B0 also includes a secondary external expansion sleeve B9. The annular secondary external expansion sleeve B9 is sleeved on the outer periphery of the secondary collet B2. The inner wall and outer wall of the secondary external expansion sleeve B9 are respectively provided with an expansion sleeve inner conical surface B9.1 and an expansion sleeve clamping surface B9.2. When the device clamps and positions the workpiece E0, the secondary collet cylindrical surface of the secondary collet B2 and the expansion sleeve inner conical surface B9.1 of the secondary external expansion sleeve B9 are tightly fitted under the restoring force of the second spring B5, and the expansion sleeve clamping surface B9.2 of the secondary external expansion sleeve B9 expands outward, thereby making the expansion sleeve clamping surface B9.2 tightly fit with the second positioning surface of the workpiece E0.

[0042] An anti-rotation pin A8 is also provided in the first-level expansion sleeve A0. An annular second groove is provided at the same vertical position on the top of the first-level cone seat A1 and the bottom of the first-level guide cover A3. An anti-rotation pin A8 that can be moved up and down is provided between the second groove of the first-level cone seat A1 and the first-level guide cover A3. An annular third groove is provided on the top of the first-level guide cover A3. An anti-rotation pin A8 that can be moved up and down is provided between the third groove of the first-level guide cover A3 and the top of the first-level collet A2. The anti-rotation pin A8 is used to limit the rotational freedom of the first-level collet A2 and the first-level guide cover A3.

[0043] The primary collet A2 and the primary guide gland A3 can transmit both thrust and pull. A first thread A3.2 is located at the bottom of the outer wall of the primary guide gland A3. Second thread A6.1 of nut A6 engages with first thread A3.2 of the primary guide gland A3, compressing the first spring A4. The restoring force of the first spring A4 allows the positioning surfaces of the primary cone seat and the primary collet to mate tightly, causing the primary collet column to expand outward. A clearance fit between the first guide hole A1.2 and the first guide column A3.1 allows relative motion between the primary cone seat A1 and the primary collet A2, maintaining good coaxiality between the secondary collet column and the positioning surface of the primary cone seat.

[0044] The secondary collet B2 and the gland B4 can transmit both thrust and pull. A third thread B3.2 is located at the top of the outer wall of the secondary guide rod B3. A spherical surface B7.1 and a fourth thread B7.2 are located on the outer and inner walls of the adjustment rod B7, respectively. The spherical surface B7.1 mates with the primary guide gland A3, while the fourth thread B7.2 of the adjustment rod B7 mates with the third thread B3.2 of the secondary guide rod B3. By adjusting the screwing depth of the fourth thread B7.2 of the adjustment rod B7, a small gap is created between the adjustment rod B7 and the primary guide gland A3. A second spring B5 is installed between the secondary guide rod B3 and the connector B6, compressing the second spring B5 to a certain degree. The restoring force of the second spring B5 allows the positioning surfaces of the secondary cone seat and the collet to mate tightly, causing the secondary collet column to expand outward. The guide hole and the second guide column B3.1 provide a clearance, enabling relative motion between the secondary cone seat B1 and the secondary collet B2, while maintaining good coaxiality between the secondary cone seat positioning surfaces. The guide key B8 limits the rotational freedom of the secondary collet B2.

[0045] Example 1: When the first positioning surface and the second positioning surface of the workpiece E0 are the first plane E0.1 and the second plane E0.2 respectively, the first-level cone seat positioning surface and the first-level collet positioning surface are the first outer cone surface A1.1 and the first inner cone surface A2.1 respectively, the second-level cone seat positioning surface and the second-level collet positioning surface are the second outer cone surface B1.1 and the second inner cone surface B2.1 respectively, and the first-level collet cylindrical surface and the second-level collet cylindrical surface are the first clamping surface A2.2 and the second clamping surface B2.2 respectively. The working principle of the device is as follows:

[0046] When the device begins operation, the primary collet A2 of the primary expansion sleeve A0 and the secondary collet B2 of the secondary expansion sleeve B0 are in an expanded state. The push rod C1.1 of the thrust component C0 is pushed out, pushing the secondary guide rod B3, which in turn moves the pressure cover B4 and the secondary collet B2, compressing the second spring B5 and disengaging the second outer cone B1.1 from the second inner cone B2.1. During operation, the adjustment rod B7 contacts the primary guide pressure cover A3 of the primary expansion sleeve A0 and transmits thrust, compressing the first spring A4 and disengaging the first outer cone A1.1 from the first inner cone A2.1. At this point, both the first clamping surface A2.2 and the second clamping surface B2.2 are in a contracted state. The workpiece E0 can now be placed on the support ring A7. Then, the push rod C1.1 of the thrust component C0 retracts, releasing the thrust from the first spring A4 of the primary expansion sleeve A0 and the second spring B5 of the secondary expansion sleeve B0. The springs then force the first clamping surface A2.2 into close contact with the first plane E0.1 of the workpiece E0, and the second clamping surface B2.2 into close contact with the second plane E0.2 of the workpiece E0, achieving high-precision positioning and clamping of the workpiece E0. The spindle turret D0 then rotates the clamping device and workpiece E0, completing the balancing test.

[0047] Example 2: When the first positioning surface and the second positioning surface of the workpiece E0 are respectively the first conical surface E0.3 and the second conical surface E0.4, the first-level cone seat positioning surface and the first-level collet positioning surface are respectively the first positioning cylindrical surface A1.3 and the first inner plane, the second-level cone seat positioning surface and the second-level collet positioning surface are respectively the second positioning cylindrical surface B1.3 and the second inner plane, the first-level collet cylindrical surface and the second-level collet cylindrical surface are respectively the first collet conical surface A2.3 and the second collet conical surface B2.3, an anti-rotation pin A8 is provided between the support ring A7 and the first-level outer expansion sleeve A9, and the anti-rotation pin A8 is used to limit the rotational freedom between the support ring A7 and the first-level outer expansion sleeve A9. The working principle of the device is as follows:

[0048] During operation, the primary outer expansion sleeve A9 and the secondary outer expansion sleeve B9 are in an expanded state. Subsequently, the thrust component C0 activates, compressing the second spring B5 of the secondary expansion sleeve B0, disengaging the second collet cone B2.3 from the expansion sleeve's inner cone B9.1 and contracting the expansion sleeve's clamping surface A9.2. During operation, the adjustment rod B7 contacts the primary guide gland A3 of the primary expansion sleeve A0, transmitting thrust and compressing the first spring A4, disengaging the first collet cone A2.3 from the expansion sleeve's inner cone A9.1 and contracting the expansion sleeve's clamping surface A9.2. Workpiece E0 is placed on support ring A7. Push rod C1.1 of thrust component C0 is then retracted, releasing the thrust from first spring A4 of primary expansion sleeve A0 and second spring B5 of secondary expansion sleeve B0. This spring forces the expansion sleeve's clamping surface A9.2, which aligns tightly with workpiece E0's first tapered surface E0.3, and the expansion sleeve's clamping surface B9.2, which aligns tightly with workpiece E0's second tapered surface E0.4. This achieves high-precision positioning and clamping of workpiece E0, maintaining a fixed clamping position relative to the workpiece. Spindle turntable D0 rotates the clamping device and workpiece E0, completing the balancing test.

[0049] The first-stage expansion sleeve A0 and the second-stage expansion sleeve B0 have different travel ranges to adapt to the different size ranges of the two positioning surfaces of the workpiece E0, completing high-precision and stable clamping of the workpiece E0 and avoiding interference with the stability of the balance test. The structure is compact and lightweight.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-stage clamping device for a fully automatic balancing machine, characterized by: The invention comprises a primary expansion sleeve (A0), a secondary expansion sleeve (B0) and a thrust component (C0). The primary expansion sleeve (A0) is fixed to the top of the secondary expansion sleeve (B0), and the bottom of the secondary expansion sleeve (B0) is connected to the thrust component (C0). The thrust component (C0) is used to provide an upward thrust to the secondary expansion sleeve (B0). The clamping device is installed on the spindle turntable (D0) of the external testing machine. The primary expansion sleeve (A0) and the secondary expansion sleeve (B0) are both in contact with the workpiece (E0) to be clamped, thereby realizing the positioning and clamping of the workpiece (E0).

2. A two-stage clamping device for a fully automatic balancing machine according to claim 1, characterized in that: The first-stage expansion sleeve (A0) comprises an annular first-stage cone seat (A1), a first-stage collet (A2), a first-stage guide pressure cover (A3), a first spring (A4), a spring pressure plate (A5), a nut (A6) and a support ring (A7); the bottom of the support ring (A7) is fixedly connected to the bottom of the first-stage cone seat (A1), and there is a gap between the outer wall of the first-stage cone seat (A1) and the inner wall of the support ring (A7); the first-stage collet (A2) is movably sleeved on the outer periphery of the first-stage cone seat (A1), and the bottom of the first-stage collet (A2) is located in the gap between the first-stage cone seat (A1) and the support ring (A7); the lower part of the first-stage guide pressure cover (A3) extends into the middle part of the annular first-stage cone seat (A1) and fits tightly with the inner wall of the first-stage cone seat (A1). The bottom end of the first-stage guide pressure cover (A3) is connected to the nut (A6) through a thread, the spring pressure plate (A5) is located above the nut (A6) and is movably mounted on the outer periphery of the first-stage guide pressure cover (A3) up and down, the lower part of the first-stage cone seat (A1) is provided with an annular first groove, and an annular first spring (A4) is installed in the first groove, the upper and lower ends of the first spring (A4) are in contact with the first-stage cone seat (A1) and the spring pressure plate (A5) respectively, the inner side wall of the top of the first-stage collet (A2) is in contact with the outer side wall of the middle part of the first-stage guide pressure cover (A3) to transmit push and pull forces between the first-stage collet (A2) and the first-stage guide pressure cover (A3); the first-stage cone seat (A1) and the connecting piece (B6) in the second-stage expansion sleeve (B0) are fixedly connected.

3. The two-stage clamp device for a fully automatic balancing machine according to claim 1, characterized in that: The secondary expansion sleeve (B0) comprises a secondary cone seat (B1), a secondary collet (B2), a secondary guide rod (B3), a pressure cover (B4), a second spring (B5), a connecting piece (B6) and an adjusting rod (B7); the secondary collet (B2) is sleeved on the outer periphery of the secondary cone seat (B1), the bottom of the connecting piece (B6) is fixed on the inner periphery of the secondary cone seat (B1), the upper part of the secondary guide rod (B3) extends into the through hole in the middle of the connecting piece (B6) and fits tightly with the inner wall of the connecting piece (B6), the top end of the secondary guide rod (B3) is connected to the adjusting rod (B7) through a thread, and the lower part of the connecting piece (B6) is provided with an annular A fourth groove is formed in the fourth groove, in which an annular second spring (B5) is installed. The upper and lower ends of the second spring (B5) are respectively in contact with the connecting member (B6) and the secondary guide rod (B3). The outer periphery of the bottom of the secondary guide rod (B3) is connected with an annular pressure cover (B4). The inner side wall of the top of the secondary collet (B2) is in contact with the outer side wall of the pressure cover (B4) to transmit push and pull forces between the secondary collet (B2) and the pressure cover (B4). The top of the connecting member (B6) is fixedly connected to the primary conical seat (A1) in the secondary expansion sleeve (B0), and the secondary conical seat (B1) is installed on the spindle turntable (D0) of the external testing machine.

4. The two-stage clamp device for a fully automatic balancing machine according to claim 1, characterized in that: The thrust component (C0) includes a cylinder (C1) and a connector unit (C2). The cylinder (C1) is installed in the connector unit (C2). The connector unit (C2) is connected to the secondary conical seat (B1) in the secondary expansion sleeve (B0). The push rod (C1.1) of the cylinder (C1) passes through the opening in the middle of the secondary conical seat (B1) and contacts the secondary guide rod (B3) in the secondary expansion sleeve (B0). The cylinder (C1) is used to provide an upward thrust to the secondary guide rod (B3).

5. The two-stage clamp device for a fully automatic balancing machine according to claim 2, characterized in that: The outer wall and inner wall of the first-level cone seat (A1) are respectively provided with a first-level cone seat positioning surface and a guide hole (A1.2); the outer wall and inner wall of the first-level collet (A2) are respectively provided with a first-level collet cylindrical surface and a first-level collet positioning surface; the middle part of the outer wall surface of the first-level guide pressure cover (A3) is provided with a first guide cylindrical surface (A3.1); the guide hole (A1.2) of the first-level cone seat (A1) and the first guide cylindrical surface (A3.1) of the first-level guide pressure cover (A3) are clearance-fitted; when the nut (A6) is screwed into the thread of the first-level guide pressure cover (A3), the first-level cone seat positioning surface of the first-level cone seat (A1) and the first-level collet positioning surface of the first-level collet (A2) are tightly fitted under the action of the restoring force of the first spring (A4); the first-level collet cylindrical surface of the first-level collet (A2) expands outward, thereby making the first expansion sleeve (A0) tightly fit with the first positioning surface of the workpiece (E0).

6. The two-stage clamp device for a fully automatic balancing machine according to claim 3, characterized in that: The outer wall of the secondary cone seat (B1) is provided with a secondary cone seat positioning surface, the outer wall and inner wall of the secondary collet (B2) are respectively provided with a secondary collet cylindrical surface and a secondary collet positioning surface, the middle part of the outer wall of the secondary guide rod (B3) is provided with a second guide cylindrical surface (B3.1), the guide hole provided in the connecting member (B6) and the second guide cylindrical surface (B3.1) of the secondary guide rod (B3) are clearance-fitted, the secondary cone seat positioning surface of the secondary cone seat (B1) and the secondary collet positioning surface of the secondary collet (B2) are tightly fitted under the action of the restoring force of the second spring (B5), and the secondary collet cylindrical surface (B2.2) of the secondary collet (B2) expands outward, thereby making the secondary expansion sleeve (B0) tightly fit with the second positioning surface of the workpiece (E0).

7. The two-stage clamp device for a fully automatic balancing machine according to claim 5, characterized in that: The first-level expansion sleeve (A0) further includes a first-level external expansion sleeve (A9), which is movably sleeved on the outer periphery of the first-level collet (A2), and the bottom of the first-level external expansion sleeve (A9) is located in the gap between the first-level cone seat (A1) and the support ring (A7), and the inner wall and outer wall of the first-level external expansion sleeve (A9) are respectively provided with an expansion sleeve inner conical surface (A9.1) and an expansion sleeve clamping surface (A9.2). When the device clamps and positions the workpiece (E0), the first-level collet cylindrical surface of the first-level collet (A2) and the expansion sleeve inner conical surface (A9.1) of the first-level external expansion sleeve (A9) are tightly fitted under the action of the restoring force of the first spring (A4), and the expansion sleeve clamping surface (A9.2) of the first-level external expansion sleeve (A9) expands outward, thereby making the expansion sleeve clamping surface (A9.2) tightly fit with the first positioning surface of the workpiece (E0).

8. The two-stage clamp device for a fully automatic balancing machine according to claim 6, characterized in that: The secondary expansion sleeve (B0) also includes a secondary external expansion sleeve (B9). The annular secondary external expansion sleeve (B9) is sleeved on the outer periphery of the secondary collet (B2). The inner wall and outer wall of the secondary external expansion sleeve (B9) are respectively provided with an expansion sleeve inner conical surface 2 (B9.1) and an expansion sleeve clamping surface 2 (B9.2). When the device clamps and positions the workpiece (E0), the secondary collet cylindrical surface of the secondary collet (B2) and the expansion sleeve inner conical surface 2 (B9.1) of the secondary external expansion sleeve (B9) are tightly fitted under the action of the restoring force of the second spring (B5), and the expansion sleeve clamping surface 2 (B9.2) of the secondary external expansion sleeve (B9) expands outward, thereby making the expansion sleeve clamping surface 2 (B9.2) tightly fit with the second positioning surface of the workpiece (E0).

9. The two-stage clamp device for a fully automatic balancing machine according to claim 2, characterized in that: The first-stage expansion sleeve (A0) is further provided with an anti-rotation pin (A8), the top of the first-stage cone seat (A1) and the bottom of the first-stage guide cover (A3) are both provided with an annular second groove at the same position, an anti-rotation pin (A8) is provided between the first-stage cone seat (A1) and the second groove of the first-stage guide cover (A3), an annular third groove is provided at the top of the first-stage guide cover (A3), and an anti-rotation pin (A8) is provided between the third groove of the first-stage guide cover (A3) and the top of the first-stage collet (A2).

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