Eccentric clamp for turning high-precision eccentric shaft part

Abstract

The utility model discloses an eccentric clamp for turning a high-precision eccentric shaft part, and relates to the technical field of eccentric clamps. The eccentric ring comprises an eccentric ring body, the eccentric ring body is of an eccentric circular ring structure, an installation groove is formed by cutting from an outer circle close to the end of the eccentric ring body to an inner circle, and the installation groove is symmetrical with the axis connecting line of a perfect circle and an eccentric circle of the end face of the eccentric ring body as the symmetrical center line. The clamping block comprises an arc-shaped section and installation sections arranged on the two sides of the arc-shaped section, bolts penetrate through the installation sections to be connected with the eccentric ring body, and the eccentric ring is convenient and reliable to manufacture and clamp, low in cost, high in precision, good in reliability consistency and high in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of jigs, and more specifically, it relates to an eccentric jig for turning high-precision eccentric shaft parts. Background Art

[0002] When the existing lathes turn high-precision eccentric shaft parts, it is necessary to first clamp the eccentric shaft with an eccentric jig. However, the existing eccentric jigs have the disadvantages of low clamping accuracy, poor stability and consistency, high manufacturing cost, long disassembly and assembly time for production changeovers, low production efficiency, and high cost. As a result, the eccentric accuracy of the shaft cannot be guaranteed and cannot meet the requirements of the drawings. Moreover, when producing in small batches or batches, the eccentric accuracy of the parts is poor in stability and consistency. Content of the Utility Model

[0003] In order to overcome the above technical deficiencies, the utility model provides an eccentric jig for turning high-precision eccentric shaft parts, which has the advantages of simple production, high precision, good reliability and consistency, and low cost.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: An eccentric jig for turning high-precision eccentric shaft parts, including an eccentric ring main body. The eccentric ring main body has an eccentric circular ring structure. An installation groove is formed by cutting from the outer circle to the inner circle near the end of the eccentric ring main body. The installation groove is symmetric about the axis connection line of the circumcircle and the eccentric circle of the end face of the eccentric ring main body. A clamping block is arranged in the installation groove. The clamping block includes an arc section and installation sections arranged on both sides of the arc section, and is connected to the eccentric ring main body by bolts passing through the installation sections.

[0005] The eccentric jig of the utility model is convenient, reliable, low-cost, high-precision, good in reliability and consistency, and high in efficiency during production and clamping. During operation, only a round steel needs to be processed for the outer and inner circles according to technical requirements and then the clamping block is cut off. It is simple to produce, high in precision, good in reliability and consistency, and low in cost; during clamping, only one inner hexagon screw needs to be loosened, which is convenient and reliable for clamping, high in production efficiency, and low in part cost. It is suitable for single-piece, small-batch, and large-batch production, and is suitable for processing environments with frequent production changeovers.

[0006] Preferably, there is a gap with a range of 1-2 mm between the installation section and the installation groove. This ensures stable and reliable clamping of the eccentric shaft by the eccentric jig of this patent and high eccentric accuracy.

[0007] Preferably, the inner hole size of the eccentric circle main body and the diameter clearance of the outer circle of the eccentric shaft are within 0.02 mm - 0.05 mm. This is used to ensure the eccentric accuracy.

[0008] Preferably, a guiding sliding groove is provided on the eccentric ring main body, and a guiding block is provided on the side wall of the arc section. The guiding block can be slidably installed in the guiding sliding groove. This is used to improve the clamping accuracy of the clamping block.

[0009] Preferably, an eccentric shaft alignment device is provided on the outer circle of the eccentric ring body. The eccentric shaft alignment device includes a mounting ring sleeved on the eccentric ring body, several connecting pieces arranged on the side wall of the mounting ring, and several auxiliary pulley groups arranged on the connecting pieces. It is used for the auxiliary correction and adjustment of the eccentric shaft.

[0010] Preferably, a first motor is provided on the mounting ring, a gear ring is rotatably arranged inside the mounting ring, a first gear meshed with the external gear rack of the gear ring is provided on the output shaft of the first motor, a driving rotating shaft is arranged inside between the connecting piece and the mounting ring, a second gear meshed with the internal gear rack of the gear ring is provided on the driving rotating shaft inside the mounting ring, and a belt pulley group is arranged between the rotating shaft of the driving rotating shaft inside the connecting piece and the rotating shaft connected with the auxiliary pulley group. The mechanical mechanism replaces manual assistance, improving the accuracy and efficiency of the auxiliary correction and adjustment for the eccentric shaft.

[0011] Preferably, the belt pulley group includes a first belt pulley connected with the driving rotating shaft, a second belt pulley is arranged on the rotating shaft, and a belt is arranged between the first belt pulley and the second belt pulley.

[0012] Preferably, two groups of tightening pressure rods are arranged on the inner side of the belt between the first belt pulley and the second belt pulley. Piston cylinders are arranged on both sides of the tightening pressure rods inside the connecting piece. The end of the piston rod of the piston cylinder is connected with a V-shaped connecting rod assembly. The V-shaped connecting rod assembly is formed by hinging two straight connecting rods. The end of the piston rod is connected with the hinged part of the two straight connecting rods, and the ends of the two straight connecting rods are connected with the end of the tightening pressure rod; several sliders are arranged on the connecting piece, bearings connected with the end of the rotating shaft are arranged inside the sliders, and a telescopic spring is arranged between the sliders and the connecting piece. The mechanical mechanism replaces manual assistance, improving the accuracy and efficiency of the auxiliary correction and adjustment for the eccentric shaft, and increasing the elastic clamping, improving the clamping force on the eccentric shaft and making the auxiliary adjustment more efficient.

[0013] Compared with the prior art, the beneficial effects of the present utility model are: simple production, convenient and reliable clamping, low cost, high precision, good reliability and consistency, and high efficiency. During operation, only a round steel needs to be processed for the inner and outer circles according to technical requirements and then the clamping block is cut off. The production is simple, with high precision, good reliability and consistency, and low cost; during clamping, only one inner hexagon screw needs to be loosened, the clamping is convenient and reliable, the production efficiency is high, and the part cost is low. It is suitable for single-piece, small-batch, and large-batch production, and is suitable for the processing environment with frequent production changeovers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of the eccentric fixture of the present utility model.

[0015] Figure 2 is a side view of the eccentric fixture of the present utility model.

[0016] Figure 3 is a schematic structural diagram of the combination of the eccentric shaft alignment device and the eccentric fixture of the present utility model.

[0017] Figure 4 It is a schematic structural diagram of the eccentric shaft alignment device of the present utility model.

[0018] Figure 5 It is a schematic structural diagram of Embodiment 5 of the present utility model.

[0019] Figure 6 It is a schematic structural diagram of Embodiment 6 of the present utility model.

[0020] In the figure: eccentric ring main body 100; installation groove 101; gap 101a; central line symmetry 102; clamping block 103; arc segment 103a; installation segment 103b; eccentric shaft 200; chuck 300; bolt 104; guide chute 105; guide block 106; installation ring 107; connecting piece 108; motor mounting seat 109; first motor 110; annular sliding cavity 111; outer circular rack 113; inner circular rack 114; first gear 115; driving runner 116; second gear cavity 117; pulley cavity 118; second gear 119; transmission connecting rod 120; support connecting rod 121; rotating shaft 122; pulley 123; pulley cavity two 124; pulley one 125; pulley two 126; belt 127; tightening adjustment cavity 128; tightening pressure rod 129; sliding cavity 130; piston cylinder 131; V-shaped connecting rod assembly 132; spring cavity 133; auxiliary slider 134; spring 135; slider cavity 136; slider 137; bearing 138; telescopic spring 139. Detailed implementation manners

[0021] The technical solutions of the utility model will be further specifically described below through specific embodiments and in conjunction with the drawings:

[0022] Embodiment 1: An eccentric fixture for a high-precision eccentric shaft part of a vehicle, including an eccentric ring body 100. The eccentric ring body 100 has an eccentric circular ring structure. An installation groove 101 is cut from the outer circle to the inner circle near the end of the eccentric ring body 100. The installation groove 101 is symmetric 102 with the axis connection line of the regular circle and the eccentric circle on the end face of the eccentric ring body 100 as the symmetric center line. A clamping block 103 is arranged in the installation groove 101. The clamping block 103 includes an arc section 103a and installation sections 103b arranged on both sides of the arc section 103a. The installation sections 103b are connected to the eccentric ring body 100 through bolts 104. By adjusting the bolts 104, the gap distance between the lower surface of the installation section 103b and the bottom wall of the installation groove 101 can be changed to ensure stable and reliable clamping of the eccentric shaft 200 by the eccentric fixture in this patent and high eccentric precision. The range of the gap 101a between the lower surface of the installation section 103b and the bottom wall of the telescopic installation groove 101 is 1 - 2 mm. The diameter gap between the inner hole size of the eccentric circle main body and the outer circle of the eccentric shaft 200 is within 0.02 mm - 0.05 mm to ensure eccentric precision.

[0023] Technical requirements and specific implementation methods:

[0024] 1) When machining the eccentric ring body 100, the eccentric tolerance between the outer circle and the inner hole should be ensured within 0.01 mm. Wire cutting slow-feeding can be used to machine the outer and inner circles simultaneously at one time to ensure eccentric precision; or the outer circle can be machined by turning first, and then the inner hole can be machined by a machining center. When machining the inner hole, the outer circle is used as the machining reference center and corrected within 0.01 mm, and then the eccentric inner hole is machined to ensure eccentric precision. If this fixture is used in mass production, the eccentric ring body 100 should be quenched as a whole after rough machining of the outer and inner circles, and then finish-machined to make it have a certain hardness and wear resistance.

[0025] 2) When machining the inner hole of the eccentric ring body 100, the inner hole size and the outer circle of the eccentric shaft 200 need to be matched to ensure that the diameter gap is within 0.02 mm - 0.05 mm to ensure eccentric precision.

[0026] 3) The thickness of the clamping block 103 should be within half of the thickness of the eccentric ring body 100 to ensure stable and reliable clamping and facilitate calibration.

[0027] 4) When clamping the eccentric ring body 100 on the chuck 300, the outer circle runout of the eccentric ring body 100 needs to be corrected within 0.01 mm (such as in the clamping view) to ensure that the outer circle of the eccentric ring body 100 coincides with the center point of the machine tool spindle chuck 300 and ensure eccentric precision.

[0028] 5) When clamping the eccentric ring body 100, only one of the bolts 104 needs to be loosened, and the chuck jaws cannot be loosened to ensure the stability and consistency of the parts during small-batch and large-batch production.

[0029] Embodiment 2:

[0030] This embodiment is a further optimization based on Embodiment 1.

[0031] A guiding chute 105 is formed in the eccentric ring body 100. The guiding chute 105 has a T-shaped structure and is formed by opening from the outer circle of the eccentric ring body 100 to the inner hole side along the symmetry line direction. A guiding block 106 is fixedly provided on the side wall of the arc segment 103a. The guiding block 106 can be slidably installed in the guiding chute 105 to ensure the stable and reliable fixation of the clamping block 103 in the eccentric fixture of this patent and improve the eccentric accuracy.

[0032] Embodiment 3:

[0033] This embodiment is provided with an eccentric shaft alignment device on the basis of Embodiment 1 or 2. The eccentric shaft alignment device includes a mounting ring 107 sleeved on the outer periphery of the eccentric ring body 100, three groups of connecting members 108 provided on the side wall of the mounting ring 107, and an auxiliary pulley group provided on each group of the connecting members 108. The auxiliary pulley group includes two groups of support connecting rods provided on the connecting member 108. A plurality of pulleys 123 are provided between the support connecting rods. The connecting members 108 are arranged in a circumferential array on the side wall of the mounting ring 107. This device can fit and support the outer wall of the eccentric shaft 200 through a plurality of groups of pulleys arranged at equal circumferential intervals, and can effectively assist the manual rotation and auxiliary adjustment and correction of the eccentric shaft 200.

[0034] Embodiment 4:

[0035] This embodiment further defines the eccentric shaft alignment device on the basis of Embodiment 3. The mounting ring 107 has an annular structure. A motor mounting seat 109 is fixedly provided on the outer peripheral wall of the mounting ring 107. A first motor 110 is fixedly provided on the motor mounting seat 109. An annular sliding cavity 111 is provided inside the mounting ring 107. A gear ring 112 is rotatably provided inside the annular sliding cavity 111. An outer circular rack 113 is provided inside the outer peripheral wall of the gear ring 112. An inner circular rack 114 is provided on the inner peripheral wall of the gear ring 112. A first gear 115 is fixedly provided on the output shaft of the first motor 110. The first gear 115 is meshed and connected with the outer circular rack 113 on the gear ring 112. The mounting ring 107 is provided with three groups of second gear cavities 117. A first pulley cavity 118 is provided inside the connecting member 108. A driving runner 116 is rotatably provided between the second gear cavity 117 and the pulley cavity 118. A second gear 119 is fixedly provided on the driving runner 116 inside the second gear cavity 117. The second gear 119 is meshed and connected with the inner circular rack 114 on the gear ring 112.

[0036] On the side of the connecting member 108 close to the eccentric ring body 100 of the auxiliary pulley group, a transmission connecting rod 120 is provided. The two groups of support connecting rods 121 on the same connecting member 108 are located on both sides of the transmission connecting rod 120. A rotating shaft 122 is provided between the two groups of support connecting rods 121. Two pulleys 123 are arranged at intervals on the rotating shaft 122. A second pulley cavity 124 is provided inside the transmission connecting rod 120. The first pulley cavity 118 is communicated with the second pulley cavity 124. A pulley group is provided between the driving runner 116 and the rotating shaft 122. The pulley group includes a first pulley 125 provided on the driving runner 116 inside the connecting member 108, a second pulley 126 provided on the rotating shaft 122, and a belt 127 provided between the first pulley 125 and the second pulley 126.

[0037] This device can support and fit the outer circumferential wall of the eccentric shaft 200 by arranging a number of pulley pairs at equal circumferential intervals, which can effectively assist in the automatic rotation, auxiliary adjustment and correction of the eccentric shaft 200. The specific implementation method is as follows. When the clamping jaw 300 is installed with the eccentric fixture and the orientation of the eccentric shaft 200 needs to be corrected after reinstalling the eccentric shaft 200, the eccentric shaft alignment device can be started to quickly and accurately correct the eccentric shaft 200, greatly improving the clamping quality of the eccentric fixture. First, start the first motor 110. The first motor 110 drives the first gear 115 to rotate. The rotation of the first gear 115 drives the gear ring 112 to rotate. The rotation of the gear ring 112 drives the second gear 119 to rotate. The rotation of the second gear 119 drives the driving runner 116 to rotate. The rotation of the driving runner 116 drives the first pulley 125 to rotate. The rotation of the first pulley 125 drives the belt 127 to rotate. The belt 127 drives the second pulley 126 to rotate, thereby driving the rotating shaft 122 to rotate. The rotating shaft 122 drives the pulley 123 to rotate, thereby realizing the orientation correction of the eccentric shaft 200.

[0038] Embodiment 5:

[0039] This embodiment further defines the eccentric shaft alignment device on the basis of Embodiment 4. Tightening adjustment cavities 128 are provided on both sides of the second pulley cavity 124. Two groups of tightening pressure rods 129 are arranged inside the belt 127 between the first pulley 125 and the second pulley 126 in the second pulley cavity 124. Both ends of the tightening pressure rod 129 extend into the tightening adjustment cavity 128, and the tightening pressure rod 129 can slide along a sliding cavity 130 provided between the second pulley cavity 124 and the tightening adjustment cavity 128. A piston cylinder 131 is fixedly arranged in the tightening adjustment cavity 128. The end of the piston rod of the piston cylinder 131 is connected with a V-shaped connecting rod assembly 132. The V-shaped connecting rod assembly 132 is formed by hinging two straight connecting rods. The end of the piston rod on the piston cylinder 131 is connected to the hinged part of the two straight connecting rods, and the ends of the two straight connecting rods are connected to the end of the tightening pressure rod 129. By starting the piston cylinder 131, the piston rod on the piston cylinder 131 can push the V-shaped connecting rod assembly 132 to move and open, thereby driving the tightening pressure rod 129 to move towards both sides of the belt 127, so that the belt 127 can maintain a tightened state. This structure, combined with the following content, can enable this device to ensure the tight transmission between the pulleys while ensuring that the pulley 123 keeps fitting and pressing against the eccentric shaft 200, thus realizing effective linkage; the support connecting rod 121 is provided with a slider cavity 136. A slider 137 is slidably arranged in the slider cavity 136. A bearing 138 is arranged inside the slider 137. The end of the rotating shaft 122 is connected with the bearing 138. A telescopic spring 139 is arranged between the top of the slider cavity 136 and the end of the slider 137. Through the structure of the telescopic spring cooperating with the slider, the rotating shaft and the pulley, it can be realized to keep the slider in contact with the eccentric shaft 200, thereby improving the correctable quality of the eccentric shaft 200.

[0040] The implementation method is as follows. After the jaw 300 and the eccentric fixture are installed, when the azimuth of the eccentric shaft 200 needs to be corrected after the eccentric shaft 200 is installed again, the azimuth alignment device of the eccentric shaft can be started to quickly and accurately correct the eccentric shaft 200, which greatly improves the clamping quality of the eccentric fixture. First, start the first motor 110. The first motor 110 drives the first gear 115 to rotate. The rotation of the first gear 115 drives the gear ring 112 to rotate. The rotation of the gear ring 112 drives the second gear 119 to rotate. The rotation of the second gear 119 drives the driving runner 116 to rotate. The rotation of the driving runner 116 drives the first pulley 125 to rotate. The rotation of the first pulley 125 drives the belt 127 to rotate. The belt 127 drives the second pulley 126 to rotate, thereby driving the rotating shaft 122 to rotate. The rotating shaft 122 drives the pulley 123 to rotate, so as to realize the azimuth correction of the eccentric shaft 200. And through the structure of the cooperation of the telescopic spring with the slider, the rotating shaft and the pulley, it can be realized that the slider is kept in contact with the eccentric shaft 200, thereby improving the correctable quality of the eccentric shaft 200.

[0041] Example 6:

[0042] This embodiment further defines the eccentric shaft alignment device on the basis of Embodiment 4. Tightening adjustment cavities 128 are provided on both sides of the second pulley cavity 124. Two groups of tightening pressure rods 129 are arranged inside the belt 127 between the first pulley 125 and the second pulley 126 in the second pulley cavity 124. Both ends of the tightening pressure rod 129 extend into the tightening adjustment cavity 128, and the tightening pressure rod 129 can slide along a sliding cavity 130 provided between the second pulley cavity 124 and the tightening adjustment cavity 128. A spring cavity 133 is provided in the tightening adjustment cavity 128. An auxiliary slider 134 is arranged in the spring cavity 133. A V-shaped link assembly 132 is hinged to the auxiliary slider 134. The V-shaped link assembly 132 is formed by hinging two straight links. One side end of the auxiliary slider 134 is connected to the hinged part of the two straight links. The ends of the two straight links are connected to the end of the tightening pressure rod 129. A spring 135 is provided between the spring cavity 133 and the auxiliary slider 134. By activating the spring 135, the spring 135 can push the V-shaped link assembly 132 to move and open, thereby driving the tightening pressure rod 129 to move towards both sides of the belt 127, so that the belt 127 can maintain a tightened state. This structure, combined with the following content, can enable this device to ensure the tight transmission between the pulleys while ensuring that the pulley 123 keeps in a fitting and pressing state with the eccentric shaft 200, thus realizing effective linkage; the support link 121 is provided with a slider cavity. A slider is slidably arranged in the slider cavity. A bearing is arranged inside the slider. The end of the rotating shaft is connected to the bearing. A telescopic spring is provided between the top of the sliding cavity and the end of the slider. Through the structure of the telescopic spring cooperating with the slider, the rotating shaft and the pulley, it can be realized that the slider keeps in contact with the eccentric shaft 200, thereby improving the correctable quality of the eccentric shaft 200.

[0043] The implementation method is as follows. After the jaw 300 and the eccentric fixture are installed, when the azimuth of the eccentric shaft 200 needs to be corrected after the eccentric shaft 200 is installed again, the eccentric shaft alignment device can be started to quickly and accurately correct the eccentric shaft 200, greatly improving the clamping quality of the eccentric fixture. First, start the first motor 110. The first motor 110 drives the first gear 115 to rotate. The rotation of the first gear 115 drives the gear ring 112 to rotate. The rotation of the gear ring 112 drives the second gear 119 to rotate. The rotation of the second gear 119 drives the drive runner 116 to rotate. The rotation of the drive runner 116 drives the first pulley 125 to rotate. The rotation of the first pulley 125 drives the belt 127 to rotate. The belt 127 drives the second pulley 126 to rotate, thereby driving the rotating shaft 122 to rotate. The rotating shaft 122 drives the pulley 123 to rotate, thus realizing the azimuth correction of the eccentric shaft 200. Moreover, through the structure of the telescopic spring cooperating with the slider, the rotating shaft and the pulley, it can be realized that the slider is kept in contact with the eccentric shaft 200, thereby improving the correctable quality of the eccentric shaft 200.

Claims

1. An eccentric fixture for turning high-precision eccentric shaft parts, characterized in that: It includes an eccentric ring body, which is an eccentric circular ring structure. A mounting groove is formed by cutting from an outer circle to an inner circle near the end of the eccentric ring body. The mounting groove is symmetrical with the axis connecting the end circle of the eccentric ring body and the eccentric circle as the symmetry center line. A clamping block is arranged in the mounting groove. The clamping block includes an arc segment and mounting segments arranged on both sides of the arc segment, and is connected to the eccentric ring body by bolts passing through the mounting segment.

2. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 1 is characterized in that: A gap in the range of 1-2 mm is provided between the mounting section and the mounting groove.

3. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 2 is characterized in that: The diameter gap between the inner hole size of the eccentric circle body and the outer circle of the eccentric shaft is within 0.02mm-0.05mm.

4. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 3 is characterized in that: A guide slot is provided on the eccentric ring body, and a guide block is provided on the side wall of the arc section. The guide block can be slidably installed in the guide slot.

5. An eccentric fixture for turning high-precision eccentric shaft parts according to any one of claims 1 to 4, characterized in that: An eccentric shaft alignment device is arranged on the outer circle of the eccentric ring body, and the eccentric shaft alignment device comprises a mounting ring sleeved on the eccentric ring body, a plurality of connecting pieces arranged on the side wall of the mounting ring, and a plurality of auxiliary pulley blocks arranged on the connecting pieces.

6. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 5 is characterized in that: A first motor is provided on the mounting ring, a gear ring is rotatably provided inside the mounting ring, a first gear meshingly connected with an outer circular rack of the gear ring is provided on the output shaft of the first motor, a driving shaft is provided between the connecting piece and the mounting ring, a second gear meshingly connected with an inner circular rack of the gear ring is provided on the driving shaft inside the mounting ring, and a pulley group is provided between the driving shaft in the connecting piece and the shaft connected with the auxiliary pulley group.

7. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 6 is characterized in that: The pulley assembly comprises a pulley 1 connected to a driving shaft, a pulley 2 is arranged on the shaft, and a belt is arranged between the pulley 1 and the pulley 2.

8. The eccentric fixture for turning high-precision eccentric shaft parts according to claim 7 is characterized in that: Two groups of tightening and pressing rods are arranged on the inner side of the belt between the first pulley and the second pulley, piston cylinders are arranged on both sides of the tightening and pressing rods in the connecting piece, the piston rod ends of the piston cylinders are connected with V-shaped connecting rod assemblies, the V-shaped connecting rod assemblies are hinged by two straight connecting rods, the piston rod ends are connected to the hinged parts of the two straight connecting rods, and the ends of the two straight connecting rods are connected to the ends of the tightening and pressing rods; a plurality of sliding blocks are arranged on the connecting piece, bearings connected to the ends of the rotating shaft are arranged in the sliding blocks, and telescopic springs are arranged between the sliding blocks and the connecting piece.

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