Crankshaft main journal centering fixture

Abstract

The application discloses a crankshaft main journal center frame, the upper part of the center frame is provided with an extension assembly, the extension assembly is connected with an upper supporting arm and a lower supporting arm, the upper supporting arm and the lower supporting arm are respectively connected with a first positioning assembly and a second positioning assembly, the first positioning assembly and the second positioning assembly are in abutment with a crankshaft main journal, the upper supporting arm is connected with the lower part of the center frame in a shaft mode, the lower supporting arm is connected with the center frame in a shaft mode, a slide rail is arranged above the center frame, a sliding seat is connected with the slide rail, a hydraulic cylinder is arranged on the sliding seat, a piston rod of the hydraulic cylinder is connected with a third positioning assembly, the third positioning assembly is in abutment with the crankshaft main journal, and the application has the advantages that the application can be applied to clamping a large-size crankshaft journal, the clamping position is adjustable, the clamping precision is high, the positioning assemblies are all positioned in a shaft journal line contact mode, and the crankshaft is prevented from shaking in the grinding process.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing, specifically to a quick clamping and positioning device for shaft-type machined parts. Background Technology

[0002] The crankshaft requires extremely high machining precision. As a shaft component, it needs to be handled with extra care during clamping. Excessive clamping force will cause stress on the crankshaft, affecting the cylindricity of the crankshaft surface and its service life during actual operation. Incorrect clamping will result in point contact between the fixture and the outer surface of the crankshaft, which will also affect the crankshaft's service life and cause significant damage. Therefore, a crankshaft fixture with high clamping precision, high flexibility, adjustable clamping force, and adjustable clamping position is needed. Summary of the Invention

[0003] To address the aforementioned problems, this invention discloses a crankshaft main journal center support.

[0004] The specific technical solution is as follows:

[0005] A crankshaft main journal center support is provided, comprising a center support with an extension component on the upper part of the center support, the extension component being connected to an upper support arm and a lower support arm, the upper support arm and the lower support arm being connected to a first positioning component and a second positioning component respectively, the first positioning component and the second positioning component abutting against the crankshaft main journal, the upper support arm being axially connected to the lower part of the center support, the lower support arm being axially connected to the center support, a slide rail being provided above the center support, the slide rail being connected to a sliding seat, a hydraulic cylinder being provided on the sliding seat, the piston rod of the hydraulic cylinder being connected to a third positioning component, the third positioning component abutting against the crankshaft main journal.

[0006] The extension assembly consists of a first extension assembly and a second extension assembly. The first extension assembly and the second extension assembly are respectively connected to the upper support arm and the lower support arm. The first extension assembly is located on the upper part of the central frame, and the second extension assembly is located on the lower part of the central frame.

[0007] The first extension assembly includes a servo motor connected to one end of a reducer, the other end of the reducer connected to one end of a coupling, the other end of the coupling connected to one end of a ball screw, the other end of the ball screw connected to one end of a nut, the other end of the nut fixed to one end of a nut connector, a transmission key mounted on the nut connector, the other end of the nut connector connected to a hinge bolt, and the upper support arm shaft-connected to the hinge bolt; the second extension assembly has the same structure as the first extension assembly.

[0008] The first positioning component includes a middle lower pressure block disposed on the upper support arm. The middle lower pressure block is connected to the middle pressure block and the baffle. A blind hole is provided in the middle pressure block. A floating shaft is disposed in the blind hole. A shim is fixedly disposed at the upper end of the floating shaft. The lower end of the floating shaft is a cylinder. To ensure that the floating shaft can rotate in the blind hole, the structure of the blind hole is conformed to the shape of the cylinder of the floating shaft. A gap is provided between the shim and the middle pressure block.

[0009] The second positioning component includes a second intermediate pressing block, which is disposed on a lower support arm. The lower support arm is connected to the central frame via a cylindrical pin. A third intermediate pressing block is disposed on the second intermediate pressing block. A blind hole is provided inside the third intermediate pressing block, and a baffle is provided at its end. A second floating shaft is disposed inside the blind hole, and a second shim is disposed on the second floating shaft. A gap is provided between the second shim and the third intermediate pressing block.

[0010] The third positioning component includes a shaft connecting block, the lower end of which is shaft-connected to the end of the sliding seat, and the upper end of which is shaft-connected to the end of the piston rod. The shaft connecting block is connected to a fourth intermediate pressing block. The fourth intermediate pressing block has a blind hole inside and a third baffle at its end. A third floating shaft is provided inside the blind hole, and a third gasket is provided on the third floating shaft.

[0011] To further ensure smooth operation and rotation of the ball screw, a bearing sleeve is fitted around the ball screw of the first extended assembly. The bearing sleeve is fitted with a bearing, with one side of the inner ring of the bearing abutting against the bearing sleeve, and the other side of the inner ring of the bearing abutting against a lock nut screwed to the bearing sleeve.

[0012] This invention further discloses a crankshaft main journal linkage center frame using a single servo motor. The extended assembly includes a servo motor disposed on the upper part of the center frame. The servo motor is connected to one end of a reducer, the other end of the reducer is connected to one end of a coupling, the other end of the coupling is connected to one end of a ball screw, the other end of the ball screw is connected to one end of a nut, the other end of the nut is fixed to one end of a nut connector, a transmission key is installed on the nut connector, the other end of the nut connector is connected to a hinge bolt, the upper support arm is axially connected to the hinge bolt, two rotating sleeves are disposed at the lower part of the center frame, the two rotating sleeves are axially connected to the lower end of the lower support arm, a guide pin is disposed on the lower support arm, the guide pin is disposed in the slide groove of the center frame, and the guide pin also abuts against the outer wall of the upper support arm.

[0013] The advantages of this invention are: it is applicable to the clamping of large crankshaft journals, the clamping position is adjustable, the clamping accuracy is high, and the positioning components are all positioned by contacting the journal line to prevent the crankshaft from vibrating during the grinding process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0016] Figure 3 is Figure 2 A magnified view of part A;

[0017] Figure 4 for Figure 2 HH direction cross-sectional view;

[0018] Figure 5 for Figure 4 KK direction sectional view;

[0019] Figure 6 for Figure 2 EE direction sectional view;

[0020] Figure 7 for Figure 6 GG-direction sectional view;

[0021] Figure 8 for Figure 2 BB direction sectional view;

[0022] Figure 9 for Figure 8 A cross-sectional view along the CC direction;

[0023] Figure 10 This is a schematic diagram of the structure in the second specific implementation method. Specific implementation method one:

[0025] The present invention will now be described in detail with reference to the accompanying drawings. As shown in the drawings, a crankshaft main journal center frame is provided, comprising a center frame 1, an extension component 2 provided on the upper part of the center frame, the extension component being connected to an upper support arm 3 and a lower support arm 4, the upper support arm 3 and the lower support arm 4 being respectively connected to a first positioning component 5 and a second positioning component 6, the first positioning component 5 and the second positioning component 6 abutting against the crankshaft main journal 7, the upper support arm 3 being axially connected to the lower part of the center frame 1, the lower support arm 4 being axially connected to the center frame 1, a slide rail 8 being provided above the center frame 1, the slide rail 8 being connected to a sliding seat 9, a hydraulic cylinder 10 being provided on the sliding seat, the piston rod 11 of the hydraulic cylinder 10 being connected to a third positioning component 12, the third positioning component 12 abutting against the crankshaft main journal 7.

[0026] The extension component 2 is composed of a first extension component 13 and a second extension component 14. The first extension component 13 and the second extension component 14 are respectively connected to the upper support arm 3 and the lower support arm 4. The first extension component 13 is disposed on the upper part of the central frame 1, and the second extension component 14 is disposed on the lower part of the central frame 1.

[0027] The first extension assembly includes a servo motor 15, which is connected to one end of a reducer 16. The other end of the reducer 16 is connected to one end of a coupling 17, and the other end of the coupling 17 is connected to one end of a ball screw 18. The other end of the ball screw 18 is connected to one end of a nut 19, and the other end of the nut 19 is fixed to one end of a nut connector 20. A transmission key 21 is installed on the nut connector 20, and the other end of the nut connector 20 is connected to a hinge bolt 22. The upper support arm 3 is axially connected to the hinge bolt 22. The second extension assembly 14 has the same structure as the first extension assembly 13.

[0028] The first positioning component 5 includes a middle lower pressure block 23 disposed on the upper support arm 3. The middle lower pressure block 23 is connected to the middle pressure block 24 and the baffle 25. A blind hole is provided in the middle pressure block 24. A floating shaft 26 is disposed in the blind hole. A shim 27 is fixedly disposed at the upper end of the floating shaft 26. The lower end of the floating shaft 26 is a cylinder. In order to ensure that the floating shaft 26 can rotate in the blind hole, the structure of the blind hole is conformed to the shape of the cylinder of the floating shaft 26, and a gap is provided between the shim 27 and the middle pressure block 24.

[0029] The second positioning component 6 includes a second intermediate pressing block 28, which is disposed on the lower support arm 4. The lower support arm 4 is axially connected to the central frame by a cylindrical pin 29. A third intermediate pressing block 30 is disposed on the second intermediate pressing block 28. A blind hole 31 is disposed inside the third intermediate pressing block, and a baffle 32 is disposed at the end. A second floating shaft 33 is disposed inside the blind hole 31. A second gasket 34 is disposed on the second floating shaft 33, and a gap is provided between the second gasket 34 and the third intermediate pressing block 30.

[0030] The third positioning component 12 includes a shaft connecting block 35. The lower end of the shaft connecting block 35 is shaft-connected to the end of the sliding seat 9, and the upper end of the shaft connecting block 35 is shaft-connected to the end of the piston rod 11. The shaft connecting block 35 is connected to the fourth intermediate lower pressing block 36. The fourth intermediate lower pressing block 36 has a blind hole 37 inside and a third baffle 38 at its end. A third floating shaft 39 is provided inside the blind hole, and a third gasket 40 is provided on the third floating shaft.

[0031] To further ensure smooth operation and rotation of the ball screw, a bearing sleeve 41 is fitted over the ball screw of the first extended assembly. The bearing sleeve 41 is fitted with a bearing 42. One side of the inner ring of the bearing abuts against the bearing sleeve, and the other side of the inner ring of the bearing abuts against a locking nut 43 screwed to the bearing sleeve 41.

[0032] The method of using this invention is as follows:

[0033] First, prepare the crankshaft main journal. Then, place this device near the crankshaft main journal and start the servo motor. The servo motor transmits power to the ball screw through the reducer and coupling. The ball screw pushes the upper support arm, causing it to rotate around the axis. Similarly, the servo motor of the second extension component transmits power to the ball screw, allowing the lower support arm to rotate around the axis. The power for the third positioning component comes from the hydraulic cylinder. The piston rod of the hydraulic cylinder pushes the third positioning component to rotate around the axis. Finally, the shims on the three positioning components abut against the outer surface of the crankshaft main journal, completing the clamping. Specific Implementation Method Two:

[0035] This invention further discloses a crankshaft main journal linkage center frame using a single servo motor. The extended assembly 2 includes a servo motor 15 disposed on the upper part of the center frame. The servo motor 15 is connected to one end of a reducer 16, the other end of the reducer 16 is connected to one end of a coupling 17, the other end of the coupling 17 is connected to one end of a ball screw 18, the other end of the ball screw 18 is connected to one end of a nut 19, and the other end of the nut 19 is fixed together with one end of a nut connector 20. A transmission key 21 is installed on the nut connector 20. The other end of the nut connector 21 is connected to the hinge bolt 22. The upper support arm 3 is axially connected to the hinge bolt 22. Two rotating sleeves 44 are provided at the lower part of the central frame 1. The two rotating sleeves 44 are axially connected to the lower end of the lower support arm 4. A guide pin 45 is provided on the lower support arm. The guide pin 45 is located in the slide groove 46 of the central frame 1. The guide pin 45 also abuts against the outer wall of the upper support arm 3.

[0036] The method of using this invention is as follows: First, prepare the crankshaft main journal, then start the servo motor. The servo motor transmits power to the ball screw through the reducer and coupling. The ball screw then pushes the upper support arm to rotate around the shaft. Since the guide pin abuts against the outer wall of the upper support arm and is also provided with a sliding groove, when the upper support arm rotates clockwise, the lower support arm rotates together with the upper support arm in the sliding groove. When it is necessary to clamp the crankshaft main journal, the upper support arm rotates counterclockwise, driving the guide pin to rotate counterclockwise in the sliding groove. Finally, the three-sided clamping of the crankshaft main journal is completed with the help of the third positioning component.

Claims

1. A crankshaft main journal center support, characterized in that: A central frame is provided, with an extension assembly on its upper part. The extension assembly is connected to an upper support arm and a lower support arm, which are respectively connected to a first positioning assembly and a second positioning assembly. The first and second positioning assemblies abut against the crankshaft main journal. The upper support arm is axially connected to the lower part of the central frame, and the lower support arm is axially connected to the central frame. A slide rail is provided above the central frame, and a sliding seat is connected to the slide rail. A hydraulic cylinder is mounted on the sliding seat, and the piston rod of the hydraulic cylinder is connected to a third positioning assembly, which abuts against the crankshaft main journal. The extension assembly consists of a first extension assembly and a second extension assembly, which are respectively connected to the upper and lower support arms. The first extension assembly is located on the upper part of the central frame, and the second extension assembly is located on the lower part of the central frame. The first extension assembly includes a servo motor. The servo motor is connected to one end of the reducer, the other end of the reducer is connected to one end of the coupling, the other end of the coupling is connected to one end of the ball screw, the other end of the ball screw is connected to one end of the nut, the other end of the nut is fixed to one end of the nut connector, a transmission key is installed on the nut connector, the other end of the nut connector is connected to the hinge bolt, and the upper support arm is axially connected to the hinge bolt; the second extension assembly has the same structure as the first extension assembly; the first positioning assembly includes a middle lower pressure block disposed in the upper support arm, the middle lower pressure block is connected to the middle pressure block and the baffle, a blind hole is disposed in the middle pressure block, a floating shaft is disposed in the blind hole, a shim is fixedly disposed at the upper end of the floating shaft, the lower end of the floating shaft is a cylinder, the structure of the blind hole is conformally arranged to the cylinder of the floating shaft, and a gap is disposed between the shim and the middle pressure block.

2. The crankshaft main journal center support according to claim 1, characterized in that: The second positioning component includes a second intermediate pressing block, which is disposed on a lower support arm. The lower support arm is connected to the central frame via a cylindrical pin. A third intermediate pressing block is disposed on the second intermediate pressing block. A blind hole is provided inside the third intermediate pressing block, and a baffle is provided at its end. A second floating shaft is disposed inside the blind hole, and a second shim is disposed on the second floating shaft. A gap is provided between the second shim and the third intermediate pressing block.

3. The crankshaft main journal center support according to claim 1, characterized in that: The third positioning component includes a shaft connecting block, the lower end of which is shaft-connected to the end of the sliding seat, and the upper end of which is shaft-connected to the end of the piston rod. The shaft connecting block is connected to a fourth intermediate lower pressing block. A blind hole is provided inside the fourth intermediate lower pressing block, and a third baffle is provided at its end. A third floating shaft is provided inside the blind hole, and a third gasket is provided on the third floating shaft. A gap is provided between the third gasket and the fourth intermediate lower pressing block.

4. The crankshaft main journal center support according to claim 1, characterized in that: A bearing sleeve is fitted around the ball screw of the first protruding component. The bearing sleeve is fitted with a bearing. One side of the inner ring of the bearing abuts against the bearing sleeve, and the other side of the inner ring of the bearing abuts against a lock nut screwed to the bearing sleeve.

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