A crankshaft counterweight pre-processing device

Abstract

The application discloses a crankshaft balance block pre-processing device, which comprises a main shaft arranged in a main shaft box, a main shaft feeding driving assembly which drives the main shaft and the main shaft box to linearly move in the Y-axis direction, a main shaft gear sleeved on the main shaft, a lifting cutter gear and a falling cutter gear arranged on a gear support and connected with the main shaft gear, wherein the lifting cutter gear and the falling cutter gear rotate in opposite directions when the main shaft gear rotates, a rack extending along the X-axis direction and engaged with the lifting cutter gear in the first working position and engaged with the falling cutter gear in the second working position, a milling cutter feeding driving assembly connected with the rack, a milling cutter arranged on a milling cutter shaft, wherein the milling cutter shaft drives the milling cutter to rotate around the axis, a gear switching assembly connected with the gear support, and a rotation transmission assembly connected between the main shaft and the milling cutter shaft, wherein the milling cutter shaft is driven to rotate around the axis by the rotation transmission assembly when the main shaft rotates around the axis.

Description

Technical Field

[0001] This invention relates to a machining apparatus, and more particularly to a crankshaft machining apparatus. Background Technology

[0002] The crankshaft is a commonly used mechanical component. The current crankshaft machining process involves first drilling the center hole in process AF10, followed by milling the balance block and connecting rod journal outer diameter in process AF30. AF10 machining involves drilling the crankshaft center hole. AF30 external milling uses a chuck to hold the crankshaft main journal flange and the outer diameter of the shaft end, and a CNC device controls the milling cutter to perform follow-up interpolation milling on the crankshaft connecting rod journal. This allows for high-speed milling of four connecting rod journals in a single setup through follow-up milling.

[0003] This existing process has the following problems:

[0004] (1) AF10 has a smaller processing volume and a faster production cycle. AF30 has a larger processing volume and a longer production cycle. Therefore, there is an imbalance in the production cycle between the two processes.

[0005] (2) Figure 1 As shown, when milling the connecting rod necks of PL4, PL3, and PL2 with an AF30 milling tool, the cutting amount on both sides of the tool is uniform. When milling the connecting rod neck of PL1, the side of the balance block P is also milled. The cutting amount on one side of the balance block is extremely large, which causes an imbalance in the cutting force of the tool, resulting in vibration. This leads to uneven wear of the tool on both sides, with the cutting edge on the balance block side wearing rapidly and the insert easily chipping, resulting in batch scrap. The tool on the other side does not wear sufficiently, which wastes tool life.

[0006] Therefore, it is desirable to provide a crankshaft balance block pre-processing device that can solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a crankshaft balance block pre-machining device, which can pre-machin the side of the crankshaft balance block in the center hole drilling process on a rotary machine, thereby shifting part of the milling process of the balance block in the subsequent process steps to the center hole drilling process, thereby reducing the allowance on the balance block side of the crankshaft blank, and reducing the uneven cutting on both sides when milling the connecting rod neck and balance block.

[0008] To achieve the above objectives, the present invention provides a crankshaft balance block pre-processing device, comprising:

[0009] A spindle used for drilling center holes in crankshafts, the spindle being housed in a spindle box and capable of rotating about its own axis;

[0010] The spindle feed drive assembly drives the spindle and spindle box to move linearly in the Y-axis direction;

[0011] A main shaft gear, which is sleeved on the main shaft to rotate coaxially with the main shaft;

[0012] The lifting gear and the lowering gear, which are mounted on the gear support, are respectively connected to the main shaft gear. When the main shaft gear rotates, the lifting gear and the lowering gear rotate in opposite directions.

[0013] A rack extending along the X-axis engages with a lifting gear in the first station and with a lowering gear in the second station.

[0014] A milling cutter feed drive assembly, which is connected to the rack;

[0015] A milling cutter mounted on a milling cutter shaft, the milling cutter shaft driving the milling cutter to rotate around its axis;

[0016] A gear switching assembly, which is connected to the gear bracket;

[0017] A rotation transmission assembly is connected between the main spindle and the milling cutter shaft. When the main spindle rotates around its own axis, the rotation transmission assembly drives the milling cutter shaft to rotate around its own axis.

[0018] When the spindle feeds in the first direction in the Y-axis direction, the gear switching assembly drives the gear support to rotate around the spindle axis in the first rotation direction, so that the lifting gear meshes with the rack, thereby driving the rack to move along the third direction in the X-axis, so that the milling cutter feed transmission assembly drives the milling cutter to feed towards the crankshaft balance block to be processed.

[0019] When the spindle feeds in the second direction in the Y-axis direction, the gear switching assembly drives the gear support to rotate around the spindle axis in the second rotation direction opposite to the first rotation direction, so that the drop gear meshes with the rack, thereby driving the rack to move along the fourth direction in the X-axis, so that the milling cutter is driven away from the crankshaft balance block through the milling cutter feed transmission assembly.

[0020] Furthermore, the crankshaft balance block pre-processing device of the present invention also includes an idler wheel disposed between the drop gear and the main shaft gear, which meshes with the drop gear and the main shaft gear respectively.

[0021] Furthermore, in the crankshaft balance block pre-machining device of the present invention, the spindle feed drive assembly includes:

[0022] Electric motor;

[0023] A lead screw, which is connected to the output shaft of the motor and to the spindle box via a threaded pair;

[0024] A spindle box feed guide rail extends along the Y-axis and is slidably connected to the spindle box.

[0025] In this implementation, the motor drives the lead screw to rotate around its own axis, thereby driving the spindle box and the spindle located in the spindle box to move synchronously along the spindle box feed guide in the Y-axis direction.

[0026] Furthermore, in the crankshaft balance block pre-processing device of the present invention, the gear switching assembly includes:

[0027] A circular sleeve is fitted onto the main shaft, and the circular sleeve is provided with a groove;

[0028] A feed lever is embedded in the slot, and the tail end of the feed lever is slidably connected to a lever feed guide rail extending along the Y-axis direction so that it can be pushed by the ring sleeve and slide along the lever feed guide rail.

[0029] A vertically mounted lever pivot;

[0030] A lever, the middle part of which is rotatably connected to the lever pivot, so that the lever can rotate around the lever pivot. The first and second sliding grooves are respectively provided at the first and second ends of the lever. The upper end of the feed lever is inserted into the first sliding groove.

[0031] A skateboard has a skateboard pin, which is located in the second groove. The skateboard has a skateboard groove, which has an extension distance in both the Y-axis and Z-axis directions.

[0032] A skateboard guide rail extends along the Y-axis, and the skateboard is slidably connected to the skateboard guide rail;

[0033] A slider having a first pin and a second pin, wherein the first pin is inserted into the slide groove of the slide plate to slide along the slide groove;

[0034] The gear bracket is provided with a first inclined groove, and the second pin is inserted into the first inclined groove.

[0035] Furthermore, in the crankshaft balance block pre-processing device of the present invention, the gear switching assembly further includes a vertically arranged guide rod, and the slider is sleeved on the guide rod through a guide rod hole provided thereon.

[0036] Furthermore, in the crankshaft balance block pre-processing device of the present invention, the tail end of the feed lever is slidably connected to the lever feed guide rail through a dovetail groove pair.

[0037] Furthermore, the crankshaft balance block pre-processing device of the present invention also includes a fixedly installed rack guide rail, wherein the bottom of the rack is slidably connected to the rack guide rail.

[0038] Furthermore, in the crankshaft balance block pre-machining device of the present invention, the milling cutter feed transmission assembly includes:

[0039] The milling cutter drive shaft is capable of rotating around its own axis;

[0040] The tail end of the main spindle rocker arm is connected to the rack.

[0041] A milling cutter holder is rotatably connected to the milling cutter drive shaft so as to rotate around the axis of the milling cutter drive shaft. The upper arm of the milling cutter holder is connected to the milling cutter shaft, and a second inclined groove is provided on the lower arm of the milling cutter holder. The first end of the spindle rocker arm is inserted into the second inclined groove.

[0042] Furthermore, in the crankshaft balance block pre-processing device of the present invention, the rotational transmission assembly includes:

[0043] The spindle lever extends from the spindle in the radial direction.

[0044] A spindle sleeve is fitted onto the main shaft. The spindle sleeve is provided with an axially extending transmission rod 13. When the main shaft rotates around its own axis, the spindle lever drives the spindle sleeve to rotate coaxially with the main shaft through the transmission rod.

[0045] A main spindle drive belt covers the milling cutter drive shaft and the main spindle sleeve, wherein the milling cutter drive shaft is capable of rotating about its own axis;

[0046] A milling cutter drive shaft belt covers the milling cutter drive shaft and the milling cutter shaft.

[0047] Furthermore, in the crankshaft balance block pre-processing device of the present invention, the spindle is the spindle of a drilling machine, and a drill bit is provided at the axial end of the spindle.

[0048] The crankshaft balance block pre-machining device of the present invention can pre-machin the side of the crankshaft balance block in the drilling center hole process, thereby shifting part of the milling process of the balance block in the subsequent process steps to the drilling center hole process, thereby reducing the allowance on the balance block side of the crankshaft blank, and reducing the uneven cutting on both sides when milling the connecting rod neck and balance block. Attached Figure Description

[0049] Figure 1 The crankshaft connecting rod journals PL1-PL4 and the balance weights are shown.

[0050] Figure 2 This shows a front view of one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0051] Figure 3This shows a top view of one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0052] Figure 4 This image shows a three-dimensional structural schematic diagram of the crankshaft balance block pre-processing device according to one embodiment of the present invention from one perspective.

[0053] Figure 5 for Figure 4 Enlarged view of point I in the middle;

[0054] Figure 6 The image shows a front view of one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0055] Figure 7 for Figure 6 Sectional view at point DD;

[0056] Figure 8 This shows a schematic diagram of the crankshaft balance block pre-processing device according to one embodiment of the present invention from another perspective;

[0057] Figure 9 This shows a schematic diagram of the slider structure in one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0058] Figure 10 This shows a side view of one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0059] Figure 11 Showing Figure 10 Sectional view at point BB;

[0060] Figure 12 Showing Figure 11 Enlarged view of the middle V section;

[0061] Figure 13 This shows a side view of one embodiment of the crankshaft balance block pre-processing device of the present invention;

[0062] Figure 14 Showing Figure 13 Enlarged view of section III;

[0063] Figure 15 Showing Figure 13 Enlarged view of section IV;

[0064] Figure 16 The kinematic relationship of the crankshaft balance block pre-processing device described in this invention is indicated in one embodiment. Detailed Implementation

[0065] The crankshaft balance block pre-processing device of the present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, this explanation and description do not constitute an improper limitation on the technical solution of the present invention.

[0066] Figure 2 The diagram shows a front view of one embodiment of the crankshaft balance block pre-processing device of the present invention.

[0067] Figure 3 The image shows a top view of one embodiment of the crankshaft balance block pre-processing device of the present invention.

[0068] like Figure 2 and Figure 3 As shown, the crankshaft balance block pre-machining device of the present invention utilizes the spindle 46 and spindle box 29 of the drilling machine for drilling the center hole of the crankshaft. Through a series of components, the rotation of the spindle 46 is converted into the rotation and feed of the milling cutter 17 to pre-machin the crankshaft balance block.

[0069] Figure 4 This image shows a three-dimensional structural schematic diagram of the crankshaft balance block pre-processing device according to one embodiment of the present invention from one perspective. Figure 5 for Figure 4 Enlarged view of point I in the middle.

[0070] Figure 6 The image shows a front view of one embodiment of the crankshaft balance block pre-processing device of the present invention; Figure 7 for Figure 6 Sectional view at point DD.

[0071] Figure 8 The diagram shows a structural schematic of the crankshaft balance block pre-processing device according to one embodiment of the present invention from another perspective.

[0072] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, the crankshaft balance block pre-machining device includes: a spindle box 29 mounted on the drilling machine bed 42, wherein a spindle 46 is housed within the spindle box 29, which is capable of rotating around its own axis under the drive of a spindle motor (not shown in the figure). The spindle feed drive assembly can drive the spindle 46 and the spindle box 29 to move linearly in the Y-axis direction.

[0073] like Figure 4 and Figure 8As shown, in one embodiment, the spindle feed drive assembly includes: a motor 25 connected to the drilling machine bed 42 via an angle iron; a feed motor bearing housing 26 fixed to the drilling machine bed 42 by bolts; a spindle box feed guide rail 27 fixed to the drilling machine bed 42 by bolts; a lead screw 28 passing through the feed motor bearing housing 26 and connected to the output shaft of the motor 25, and connected to the spindle box 29 via a threaded pair; the spindle box feed guide rail 27 extending along the Y-axis direction is slidably connected to the spindle box 29.

[0074] like Figure 7 As shown, the lifting gear 38, main shaft gear 39, idler gear 40, and lowering gear 41 are all mounted within the gear bracket 8. The main shaft gear 39 is sleeved on the main shaft 46. The lifting gear 38 is directly meshed with the main shaft gear 39, and the lowering gear 41 is connected to the main shaft gear 39 via the intermediate idler gear 40. This causes the lifting gear 38 and the lowering gear 41 to rotate in opposite directions when the main shaft gear 39 rotates, thereby driving the rack 37, which meshes with the lifting gear 38 and the lowering gear 41 at different workstations, to move along the third and fourth directions in the X-axis direction.

[0075] like Figure 4 and Figure 8 As shown, the crankshaft balance block pre-processing device also includes: a milling cutter feed transmission assembly connected to the rack 37, a gear switching assembly connected to the gear bracket 8, and a rotation transmission assembly connected between the main shaft 46 and the milling cutter shaft 18. When the main shaft 46 rotates around its own axis, the rotation transmission assembly drives the milling cutter shaft 18 to rotate around its own axis.

[0076] like Figure 4 and Figure 8 As shown, when the spindle 46 is in the Y-axis direction (i.e. Figure 4 (in the left and right directions) towards the first direction (i.e. Figure 4 When feeding from the center to the left, the gear switching assembly drives the gear support 8 to rotate around the axis of the main shaft 46 in the first rotation direction, so that the lifting gear 38 meshes with the rack 37, thereby driving the rack 37 along the X-axis (i.e., from the center to the left) on the rack guide 32. Figure 4 The spindle 46 moves in a third direction (the front-to-back direction) to drive the milling cutter 17 towards the balance block of the crankshaft 6 to be machined via the milling cutter feed drive assembly. When the spindle 46 moves in the second direction (i.e., the Y-axis direction)... Figure 4 When feeding from the center to the right, the gear support 8 is driven to rotate around the axis of the main shaft 46 in a second rotation direction opposite to the first rotation direction through the gear switching assembly, so that the drop gear 41 meshes with the rack 37, thereby driving the rack 37 to move along the fourth direction on the X-axis on the rack guide 32, so as to drive the milling cutter 17 away from the balance block of the crankshaft 6 through the milling cutter feed transmission assembly.

[0077] It should be noted that the crankshaft 6 is positioned and clamped onto the rotary bed 42 by the V-block crankshaft positioning of the hydraulic clamp 7. Since the positioning and clamping of the crankshaft is existing technology, it will not be described in detail here.

[0078] In some embodiments, the rack guide rail 32 is fixed to the drilling machine bed 42 by bolts, and the rack 37 is connected to the rack guide rail 32 through a dovetail groove guide rail pair.

[0079] like Figure 4 and Figure 8 As shown, in one embodiment, the gear switching assembly includes: a circular ring sleeve 10 fitted onto the spindle 46, the circular ring sleeve 10 having a groove. A feed lever 30 is embedded in the groove, and the tail end of the feed lever 30 is slidably connected to a lever feed guide 31 extending along the Y-axis direction via a dovetail joint. When the spindle 46 feeds along the Y-axis direction, it drives the circular ring sleeve 10 to feed synchronously, and the circular ring sleeve 10 further pushes the feed lever 30 to slide along the lever feed guide 31, which is fixed to the drilling machine bed 42 by bolts. This action will push the lever 24 to rotate around the vertically mounted lever shaft 23. The hole in the middle of the lever 24 is inserted into the stepped hole at the top of the lever shaft 23, so that it can rotate around the lever shaft 23. The lever shaft 23 is fixed to the drilling machine bed 42 by bolts. The lever 24 has a first groove 241 and a second groove 242 at its head and tail ends, respectively. The upper end of the feed lever 30 is inserted into the first groove 241, and the second groove 242 contains the slide pin 201 of the slide plate 20. Figure 8 As shown, the slide plate 20 is also provided with slide plate grooves 202 extending in both the Y-axis and Z-axis directions. The slide plate 20 is connected to the slide plate guide rail 9 extending along the Y-axis direction via a dovetail groove guide rail pair. The slide plate guide rail 9 is fixed to the drilling machine bed 42 by bolts. The guide rod 21 is fixed to the drilling machine bed 42 by bolts. The slider 22 is inserted into the guide rod 21 through the guide rod hole and can slide up and down along the guide rod 21.

[0080] Figure 9 The diagram shows a schematic of the slider in one embodiment of the crankshaft balance block pre-processing device of the present invention.

[0081] like Figure 9 As shown, the slider 22 has a first pin 221 and a second pin 222, wherein the first pin 221 is inserted into the slide groove 202, thereby being able to slide along the slide groove and be guided thereby. The second pin 222 is used to insert into, for example, Figure 8 The gear bracket 8 shown is located in the first inclined groove 81.

[0082] Continue reading Figure 4In some embodiments, the milling cutter feed transmission assembly includes a milling cutter drive shaft 35, on which a milling cutter drive shaft sleeve 2 is fitted. The milling cutter drive shaft sleeve 2 passes through a hole in the milling cutter drive shaft bearing housing 1 and is tightened with a milling cutter drive shaft sleeve round nut 3, which then fits against the stepped end face of the milling cutter drive shaft sleeve 2. The milling cutter drive shaft bearing housing 1 is fixed to the drilling machine bed 42 by bolts. The milling cutter drive shaft sleeve 2 can rotate within the hole in the milling cutter drive shaft bearing housing 1.

[0083] The milling cutter feed transmission assembly also includes: a spindle cradle lever 33, the tail end of which is interference-fitted with the rack 37 through a hole; a milling cutter drive shaft sleeve 2 passing through the inner hole of the milling cutter support 16, so that the milling cutter support 16 can rotate around the milling cutter drive shaft sleeve 2, that is, realizing the rotatable connection between the milling cutter support 16 and the milling cutter drive shaft 35; the upper arm of the milling cutter support 16 is connected to the milling cutter shaft 18, and the milling cutter 17 is fixed on the milling cutter shaft 18. A second inclined groove 161 is provided on the lower arm of the milling cutter support 16, and the head end of the spindle cradle lever 33 is inserted into the second inclined groove 161. The milling cutter shaft 18 and the milling cutter drive shaft 35 pass through the two holes of the milling cutter connecting bracket 19.

[0084] like Figure 4 and Figure 5 As shown, in one embodiment, the rotational transmission assembly includes: a spindle lever 11 extending from the spindle in the radial direction. A drill bit 12 is bolted to the spindle 46. A drive rod 13 is fixed to the spindle sleeve 45. The spindle lever 11, as the spindle 46 rotates, can actuate the drive rod 13, thereby causing the spindle sleeve 45 to rotate.

[0085] Figure 10 This shows a side view of one embodiment of the crankshaft balance block pre-processing device of the present invention; Figure 11 Showing Figure 10 Sectional view at point BB; Figure 12 Showing Figure 11 A magnified view of the middle V section.

[0086] like Figure 5 , Figure 10 , Figure 11 As shown, the spindle sleeve 45 passes through the inner bore of the spindle front support 14 to allow rotation within the inner bore, and the spindle 46 passes through the inner bore of the spindle sleeve 45. The spindle front support round nut 15 positions the spindle sleeve 45 axially. Figure 12 As shown, the round nut 15 of the spindle front support is fastened to the stepped surface of the spindle sleeve 45, leaving a gap Q between it and the end face of the spindle front support 14, thereby ensuring that the spindle sleeve 45 can rotate within the spindle front support 14. Spacer rings 47 are installed on both sides of the spindle gear 39. The inner hole of the spindle gear 39 is interference-fitted with the spindle sleeve 45.

[0087] like Figure 7and Figure 11 As shown, the gear support 8 is installed in the inner hole of the main shaft gear 39 and has a clearance fit with the outer circle of the main shaft sleeve 45. Furthermore, the gear support 8 can rotate around the outer circle of the main shaft sleeve 45.

[0088] Figure 13 This shows a side view of one embodiment of the crankshaft balance block pre-processing device of the present invention; Figure 14 Showing Figure 13 Enlarged view of section III; Figure 15 Showing Figure 13 Enlarged view of section IV in the middle.

[0089] like Figure 4 and Figure 13 As shown, the spindle drive belt 34 covers the cutter drive shaft 35, for example, on the cutter drive shaft pulley 4 located on the cutter drive shaft 35 and on the spindle sleeve pulley located on the spindle sleeve 45. Additionally, the cutter drive shaft belt 5 covers another cutter drive shaft pulley 4 on the cutter drive shaft 35 and on the cutter shaft pulley on the cutter shaft 18. These components convert the rotation of the spindle 46 into rotation of the cutter shaft 18. Furthermore, as... Figure 14 As shown, the round nut 43 of the milling cutter connecting bracket is fastened to the end face of the milling cutter shaft 18, and an axial clearance M is left between it and the end face of the milling cutter connecting bracket 19 to ensure that the milling cutter shaft 18 can rotate. Figure 15 As shown, the pulley 4 of the milling cutter drive shaft is connected to the milling cutter drive shaft 35 through the pulley round nut 44 and key 36, so as to rotate coaxially with the milling cutter drive shaft.

[0090] Figure 16 The kinematic relationship of the crankshaft balance block pre-processing device described in this invention is indicated in one embodiment.

[0091] like Figure 16 As shown, the crankshaft balance block pre-machining device operates as follows:

[0092] A: Motor 25 drives spindle box 29 to slide along the negative y-axis via lead screw 28;

[0093] B: This causes the ring sleeve 10 to push the feed lever 30, causing the lever 24 to rotate around the z-axis;

[0094] C: This causes lever 24 to drive slide plate 20 to move along the positive Y-axis;

[0095] D: Causes the first pin 221 on slider 22 to move along slide groove 202;

[0096] E: This causes slider 22 to slide along guide rod 21 in the positive Z-axis direction;

[0097] F: This causes the second pin 222 of the slider 22 to drive the gear bracket 8 and its first inclined groove 81 to rotate around the main shaft along the y-axis.

[0098] G: This causes rack 37 to mesh with lifting gear 38, and rack 37 to move along the positive x-axis.

[0099] H: The spindle rocker arm lever 33 drives the milling cutter support 16 to rotate clockwise around the y-axis, causing the milling cutter 17 to feed toward the crankshaft.

[0100] When the motor 25 drives the spindle box 29 to slide along the positive y-axis via the lead screw 28, the entire device runs in the opposite direction. The process is similar, so it will not be described in detail here.

[0101] The crankshaft balance block pre-processing device described in this invention has a simple structure, is easy to manufacture and maintain, has good reliability, and is convenient to use and operate. It can make full use of the unbalanced cycle time between the AF10 and AF30 processes of the crankshaft production line, and remove the excess balance block on AF30 on AF10, which has great industrial promotion value.

[0102] The combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0103] It should also be noted that the embodiments listed above are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made thereto are those that can be directly derived or easily conceived by those skilled in the art from the content disclosed in the present invention, and should all fall within the protection scope of the present invention.

Claims

1. A crankshaft balance block pre-processing device, characterized in that, include: A spindle used for drilling center holes in crankshafts, the spindle being housed in a spindle box and capable of rotating about its own axis; The spindle feed drive assembly drives the spindle and spindle box to move linearly in the Y-axis direction; A main shaft gear, which is sleeved on the main shaft to rotate coaxially with the main shaft; The lifting gear and the lowering gear, which are mounted on the gear support, are respectively connected to the main shaft gear. When the main shaft gear rotates, the lifting gear and the lowering gear rotate in opposite directions. A rack extending along the X-axis engages with a lifting gear in the first station and with a lowering gear in the second station. A milling cutter feed drive assembly, which is connected to the rack; A milling cutter mounted on a milling cutter shaft, the milling cutter shaft driving the milling cutter to rotate around its axis; A gear switching assembly, which is connected to the gear bracket; A rotation transmission assembly is connected between the main spindle and the milling cutter shaft. When the main spindle rotates around its own axis, the rotation transmission assembly drives the milling cutter shaft to rotate around its own axis. A fixed rack guide rail, wherein the bottom of the rack is slidably connected to the rack guide rail; When the spindle feeds in the first direction in the Y-axis direction, the gear switching assembly drives the gear support to rotate around the spindle axis in the first rotation direction, so that the lifting gear meshes with the rack, thereby driving the rack to move along the third direction in the X-axis, so that the milling cutter feed transmission assembly drives the milling cutter to feed towards the crankshaft balance block to be processed. When the spindle feeds in the second direction in the Y-axis direction, the gear switching assembly drives the gear support to rotate around the axis of the spindle in the second rotation direction opposite to the first rotation direction, so that the drop gear meshes with the rack, thereby driving the rack to move along the fourth direction on the X-axis, so that the milling cutter is driven away from the crankshaft balance block through the milling cutter feed transmission assembly; The gear switching assembly includes: a ring sleeve fitted onto the main shaft, the ring sleeve having a groove; a feed lever embedded in the groove, the tail end of the feed lever being slidably connected to a lever feed guide rail extending along the Y-axis direction, so as to be pushed by the ring sleeve to slide along the lever feed guide rail; a vertically arranged lever shaft; a lever, the middle part of which is rotatably connected to the lever shaft, so that the lever can rotate around the lever shaft, the head end and tail end of the lever having a first sliding groove and a second sliding groove, the upper end of the feed lever... The end is inserted into the first slide groove; the slide plate has a slide plate pin, which is located in the second slide groove, and the slide plate has a slide plate groove, which extends in both the Y-axis and Z-axis directions; the slide plate guide rail extends along the Y-axis, and the slide plate and the slide plate guide rail are slidably connected; the slider has a first pin and a second pin, wherein the first pin is inserted into the slide plate groove to slide along the slide plate groove; the gear bracket has a first inclined groove, and the second pin is inserted into the first inclined groove; The milling cutter feed transmission assembly includes: a milling cutter drive shaft, which is rotatable around its own axis; a spindle cradle lever, the tail end of which is connected to the rack; and a milling cutter support, which is rotatably connected to the milling cutter drive shaft so as to be rotatable around the axis of the milling cutter drive shaft. The upper arm of the milling cutter support is connected to the milling cutter shaft, and a second inclined groove is provided on the lower arm of the milling cutter support. The head end of the spindle cradle lever is inserted into the second inclined groove.

2. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, It also includes an idler gear located between the drop gear and the main shaft gear, which meshes with the drop gear and the main shaft gear respectively.

3. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, The spindle feed drive assembly includes: Electric motor; A lead screw, which is connected to the output shaft of the motor and to the spindle box via a threaded pair; A spindle box feed guide rail extends along the Y-axis and is slidably connected to the spindle box.

4. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, The gear switching assembly also includes a vertically arranged guide rod, and the slider is sleeved on the guide rod through a guide rod hole provided thereon.

5. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, The tail end of the feed lever is slidably connected to the feed lever guide rail via a dovetail joint.

6. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, The rotation transmission assembly includes: The spindle lever extends from the spindle in the radial direction. A spindle sleeve is fitted onto the main shaft. The spindle sleeve is provided with an axially extending transmission rod. When the main shaft rotates around its own axis, the spindle lever drives the spindle sleeve to rotate coaxially with the main shaft through the transmission rod. A main spindle drive belt covers the milling cutter drive shaft and the main spindle sleeve, wherein the milling cutter drive shaft is capable of rotating about its own axis; A milling cutter drive shaft belt covers the milling cutter drive shaft and the milling cutter shaft.

7. The crankshaft balance block pre-processing device as described in claim 1, characterized in that, The spindle is the spindle of a drilling machine, and a drill bit is provided at the axial end of the spindle.

Images