CN108856826B - Double End string milling machine for crank connecting link - Google Patents

Abstract

The invention relates to the field of auto parts manufacturing, in particular to a double-end continuous milling machine for crank connecting rods, including a table, a feeding device, a fixing device, a transmission device, a milling device and a discharging device. Install the brackets of the transmission device, milling device and unloading device. The fixing device is installed on the discharge port of the feeding device and the transmission device that drives the fixing device to do horizontal reciprocating motion is installed on the fixing device. There are opposite sets on both sides of the transmission device. There are multiple milling devices. There is a discharge device beside the end of the transmission device. This device can perform multiple milling processes on the crank connecting rod. It can automatically load materials and fix the crank connecting rod during processing. After the processing is completed Can be unloaded automatically.

Description

Double Face Continuous Milling Machine for Crank Connecting Rods

technical field

The invention relates to the field of auto parts manufacturing, in particular to a double-face continuous milling machine for crank connecting rods.

Background technique

The shape of the crank connecting rod is relatively complex, easy to deform, poor in rigidity, high in dimensional accuracy, positional accuracy and surface quality, and it is difficult to manufacture. The quality of the connecting rod manufacturing technology directly affects the performance and economic performance of the connecting rod, as well as the survival and development of an enterprise. With the development of production technology, the traditional manufacturing technology cannot meet the current production requirements gradually. The traditional end face milling of crankshaft and connecting rod is to mark and position first, use one end face of the crankshaft connecting rod as a reference, process the other side, and then use the processed surface as a reference to process the surface with marked points. The common equipment is a disc milling machine and double station Fixtures, the machining accuracy depends on the technology and experience of the operator, and manual loading and unloading and inspection of the processed crank connecting rod are required. This method requires multiple milling to ensure the processing size, which consumes a lot of time, especially milling On the first side, since the positioning surface of the material is a forged blank, there are many protrusions, and the magnetic chuck is often not firmly adsorbed, and parts are prone to fall off from the suction cup, causing accidents

Chinese patent CN203092271U discloses a connecting rod double-end milling system, including a feed motor, a feed slideway, a main sprocket, a milling mechanism, a discharge sprocket, a discharge chute, a hydraulic device and a main controller. The feed motor is arranged at the inlet end of the feed chute, the main sprocket is located between the outlet end of the feed chute and the milling mechanism, and the first milling head and the rotating shaft of the first motor connected, the second milling head is connected to the rotating shaft of the second motor, the first milling head and the second milling head are respectively located on both sides of the main sprocket, and the discharge sprocket is arranged on the Between the milling mechanism and the discharge chute, a discharge cylinder is arranged at the feed end of the discharge chute. The motor is used to drive the material automatically, and the sprocket mechanism automatically sends the connecting rod to the grinding head for double-sided processing at the same time. The milling is completed in a closed system at one time, which effectively reduces the process time, improves labor productivity, and completely eliminates the occurrence of peripheral grinding or plane milling. The problem.

This patent does not consider the fixing mechanism during milling. When the workpiece is milled in the equipment, it is easy to jump out of the processing position due to vibration, thereby causing damage to the equipment, and the vibration of the workpiece during processing will also adversely affect the machining accuracy, and the crank The connecting rod is a casting or forging part, and the milling surface is very deep. The milling head alone is not enough to mill the double end faces of the crank connecting rod, and cannot reach the required processing depth.

Contents of the invention

The object of the present invention is to address the deficiencies in the prior art and provide a double-face continuous milling machine for crank connecting rods. The device can perform multiple milling processes on crank connecting rods, can automatically The rod is fixed, and the material can be unloaded automatically after processing.

In order to solve the above problems, the present invention provides the following technical solutions: a double-end continuous milling machine for crank connecting rods, including a table, a feeding device, a fixing device, a transmission device, a milling device and an unloading device, and the table is provided with The brackets of the transmission device, milling device and unloading device are fixedly installed. The fixing device is installed on the discharge port of the feeding device and the transmission device is installed on the fixing device to drive the fixing device to do horizontal reciprocating movement. The two sides of the transmission device are provided with opposite A plurality of milling devices are provided, and a discharge device is provided beside the end of the transmission device;

The fixing device includes a clamp arranged symmetrically up and down and a clamping device that drives the clamp to move towards each other and clamps the crank connecting rod placed in the clamp. The clamp is a rod with a width smaller than the end face width of the crank connecting rod but larger The width of the riser, the opposite sides of the two clamps are provided with a groove that can accommodate the side of the crank connecting rod, and the side of the clamp away from the feeding device is provided with a connecting device that connects the upper and lower clamps so that they are always aligned up and down.

On the basis of the above technical solution, the transmission device includes a horizontal moving device, a guide rail bracket and a slide rail. On the movable part, the horizontal moving device is equipped with a guide rail bracket that is set vertically upward and is higher than the processing position of the milling device. The top of the guide rail bracket is installed with a horizontally arranged slide rail that is consistent with the moving direction of the movable part of the horizontal moving device. The slide guide rail A slide plate that can slide relative to the slide plate guide rail is installed on the top, and the clamping device is installed on the slide plate.

On the basis of the above technical solution, the clamping device includes a movable plate arranged horizontally below the slide plate and a cylinder whose output shaft is vertically installed above the slide plate, and a guide vertically upward and penetrating the slide plate is installed on the movable plate. column, a guide sleeve sleeved on the guide column is installed on the slide plate, and the top of the fixture is fixedly installed on the bottom surface of the movable plate.

Beneficial effects: the double-end continuous milling machine for crank connecting rods provided by the present invention can perform multiple milling processes on crank connecting rods; can automatically load and unload materials; and can fix crank connecting rods during processing; Versatile.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is the top view of the present invention;

Fig. 3 is a side view of the present invention;

Fig. 4 is a perspective view of the present invention;

Fig. 5 is a three-dimensional exploded view 1 of the present invention;

Fig. 6 is a three-dimensional exploded view II of the present invention;

Fig. 7 is the enlarged view of A place of Fig. 5 of the present invention;

Fig. 8 is an enlarged view at B of Fig. 5 of the present invention;

Fig. 9 is an enlarged view at C of Fig. 6 of the present invention;

FIG. 10 is an enlarged view of D in FIG. 6 of the present invention.

Explanation of reference signs: table 1, bracket 1a, feeding device 2, vibrating plate 2a, first track 2b, turning platform 2c, first bottom plate 2c1, front baffle 2c2, side baffle 2c3, turning cylinder 2d, second Second track 2e, second bottom plate 2e1, curved side plate 2e2, vertical side plate 2e3, pusher device 2f, cylinder 2f1, slider 2f2, raised bar 2f4, slide rail 2f3, groove 2f6, stop block 2f7, fixed Device 3, fixture 3a, groove 3a1, connecting device 3a2, clamping device 3b, movable plate 3b1, cylinder 3b2, guide post 3b3, guide sleeve 3b4, transmission device 4, horizontal moving device 4a, rail bracket 4b, slide rail 4c , slide plate 4d, milling device 5, rotating device 5a, fixed frame 5a1, motor 5a2, turntable 5a3, chuck 5a4, milling cutter 5b, unloading device 6, rebound plunger 6a, biaxial plunger 6a1, rebound bracket 6a2, elastic device 6a3, horizontal moving device 6b, vertical moving device 6c.

Detailed ways

Below in conjunction with accompanying drawing and embodiment of description, specific embodiment of the present invention is described in further detail:

The double-end continuous milling machine for crank connecting rod described with reference to Figure 1 to Figure 10 includes a table 1, a feeding device 2, a fixing device 3, a transmission device 4, a milling device 5 and an unloading device 6, the table 1 is provided with a bracket 1a for fixedly installing the transmission device 4, the milling device 5 and the unloading device 6, the fixing device 3 is installed on the discharge port of the feeding device 2 and the driving fixing device 3 is installed on the fixing device 3 for horizontal reciprocating movement The transmission device 4, the two sides of the transmission device 4 are provided with a plurality of milling devices 5 facing each other, the end side of the transmission device 4 is provided with a discharge device 6, and the feeding device 2 transfers the crank connecting rod to the fixing device 3 , then the fixing device 3 fixes the crank connecting rod, and then the transmission device 4 moves the fixing device 3 together with the crank connecting rod fixed by the fixing device 3 from the discharge port of the feeding device 2 to the end of the transmission device 4, and the crank connecting rod is in the During the moving process, a plurality of facing milling devices 5 are successively passed through, and a fixed distance is preset between the working surfaces of the milling devices 5 so that the crank connecting rod can pass through the milling devices 5 with different distances successively, and the crank through multiple milling processes The connecting rod moves to the side of the unloading device 6, and is subsequently unloaded from the conveying device 4 by the unloading device 6 and moved into the finished box.

The feeding device 2 includes a vibrating plate 2a installed on the table 1, a turning cylinder 2d and a first rail 2b installed on the bracket 1a, the first rail 2b can be used for the end surface of the crank connecting rod to slide on the first rail 2b , the first track 2b is installed on the side of the vibrating plate 2a and is set obliquely downward. The turning platform 2c that the crank connecting rod is placed horizontally, the turning platform 2c is installed on the movable part of the turning cylinder 2d, the turning platform 2c is provided with the second track 2e installed on the support 1a on the side of the turning direction of the turning cylinder 2d, the turning platform 2c and the second track 2e leave a space for the turning platform 2c to turn over. The turning platform 2c includes a first bottom plate 2c1 installed on the turning surface of the turning cylinder 2d and a front panel mounted vertically upward on the first bottom plate 2c1. The baffle plate 2c2 and the side baffle plate 2c3, the side baffle plate 2c3 is arranged on the side of the first bottom plate 2c1 away from the discharge port of the first track 2b, and the front baffle plate 2c2 is arranged on the side of the first bottom plate 2c1 relative to the turning direction of the turning cylinder 2d. On the flip platform 2c, a ring baffle 2c4 is also installed, and the ring baffle 2c4 is arranged toward the bottom of the first bottom plate 2c1 and the outside of the side baffle 2c3 and is installed on the side of the first bottom plate 2c1 close to the first track 2b, The ring baffle 2c4 is in contact with the discharge port of the first track 2b, and the vibrating plate 2a transmits the crank connecting rod to the turning platform 2c through the first track 2b in the direction of the big end facing forward and the small end facing backward, and the turned platform 2c The first bottom plate 2c1 and the front baffle plate 2c2 set on the top block and stay on the turning platform 2c, and the subsequent crank connecting rods on the first track 2b are blocked by the crank connecting rods on the turning platform 2c at the discharge port of the first track 2b Then the overturning cylinder 2d works to make the overturning platform 2c overturn 90 degrees, and the crank connecting rod slides on the overturning platform 2c toward the second track 2e and finally falls on the second track 2e. When the overturning platform 2c overturns, the ring baffle plate 2c4 follows It turns over and blocks the discharge port of the first track 2b to realize intermittent feeding.

The second track 2e includes a second base plate 2e1, a curved side plate 2e2, and a vertical side plate 2e3 arranged under the side of the turning platform 2c. The second base plate 2e1 is a flat plate whose width is just enough to place a crank connecting rod vertically. The curved side plate 2e2 is installed on the second base plate 2e1 near the side of the turning platform 2c, and the vertical side plate 2e3 is installed on the second bottom plate 2e1 away from the side of the turning platform 2c. degree angle, the vertical side plate 2e3 is set vertically upwards, the workpiece slides to the second track 2e on the turning platform 2c, slides over the curved track of the curved side plate 2e2 and is blocked by the vertical surface of the vertical side plate 2e3, from The horizontal state is transformed into a vertical state, and finally falls on the second bottom plate 2e1 in a vertical state.

Pushing device 2f is installed on the second rail 2e, and pushing device 2f comprises cylinder 2f1, slide block 2f2 and slide rail 2f3, and cylinder 2f1 is arranged on the outside of one end of second rail 2e and the output axial direction of cylinder 2f1 and the second The longitudinal direction of the bottom plate 2e1 is consistent, the slide block 2f2 is installed on the output end of the cylinder 2f1 and the slide block 2f2 can slide in the second track 2e, the slide rail 2f3 is installed on the side of the vertical side plate 2e3 away from the curved side plate 2e2, The side of the slider 2f2 close to the cylinder 2f1 is provided with a protruding strip 2f4 extending toward the slide rail 2f3, and the slide rail 2f3 is provided with a groove 2f6 that can hold the protruding strip 2f4 and make it slide along the longitudinal direction of the slide rail 2f3 The end of the slide rail 2f3 away from the cylinder 2f1 is provided with a stopper 2f7 that is flush with the outer surface of the slide rail 2f3 and blocks the outlet of the groove 2f6. The length of the stopper 2f7 is smaller than that of the cylinder 2f1, and the crankshaft connecting rod is vertical Falling on the second bottom plate 2e1, the cylinder 2f1 drives the slider 2f2 to advance along the longitudinal direction of the second rail 2e and pushes the crank connecting rod to the fixing device 3, and the raised bar 2f4 provided on the slider 2f2 slides in the groove 2f6 The slider 2f2 can be suspended in the second track 2e and slide without encountering resistance. When the slider 2f2 slides to the end of the second track 2e, the raised bar 2f4 is blocked by the stopper 2f7, so that the crank connecting rod is pushed to the fixing device 3 and stay on the fixture 3, then the pushing device 2f gets back to the initial position and prepares to push next time.

The fixing device 3 includes a clamp 3a arranged symmetrically up and down and a clamping device 3b that drives the clamp 3a to move toward each other and clamps the crank connecting rod placed in the clamp 3a. The clamp 3a has a width smaller than the end face width of the crank connecting rod but greater than The vertical plate of the rod width of the rod, the opposite side of the two clamps 3a are provided with a groove 3a1 that can accommodate the side of the crank connecting rod, and the side of the clamp 3a away from the feeding device 2 is provided with a connection between the upper and lower clamps 3a. It always keeps the connecting device 3a2 aligned up and down, the crank connecting rod is pushed to the lower groove 3a1, the clamping device 3b drives the upper clamp 3a to move towards the lower clamp 3a and clamps the crank connecting rod in the clamp 3a, The connecting device 3a2 is two guide posts and guide sleeves respectively installed on the upper and lower clamps 3a, the guide posts can only slide in the guide sleeves, so that the upper and lower clamps 3a are always aligned up and down when being moved by the transmission device 4, and at the same time The connecting device 3a2 will not hinder the opening and closing of the clamp 3a.

The transmission device 4 includes a horizontal moving device 4a, a guide rail bracket 4b and a slide guide rail 4c. The horizontal moving device 4a is arranged under the clamp 3a and is fixedly installed on the table 1. The bottom end of the clamp 3a is fixedly installed on the bottom of the horizontal moving device 4a. On the movable part, the horizontal moving device 4a is equipped with a guide rail support 4b that is arranged vertically upwards and is higher than the milling device 5 processing positions. Skateboard guide rail 4c, a slide plate 4d that can slide relative to the slide plate guide rail 4c is installed on the slide plate guide rail 4c, the clamping device 3b is installed on the slide plate 4d, the horizontal moving device 4a is a ball screw slide table, and the movable part of the horizontal moving device 4a is After the clamping device 3b installed on the slider and the sliding plate 4d drives the clamp 3a to clamp the crank connecting rod, the horizontal moving device 4a drives the clamp 3a installed on the movable part of the horizontal moving device 4a to move horizontally and drives the guide rail bracket 4b and clamping The device 3b also moves accordingly, so that the crank connecting rod clamped by the clamp 3a moves towards the direction of the milling device 5 and passes through the milling device 5 to the end of the transmission device 4 under the action of the horizontal moving device 4a.

The clamping device 3b includes a movable plate 3b1 horizontally arranged below the slide plate 4d and a cylinder 3b2 whose output shaft is installed vertically downward above the slide plate 4d, and a guide column 3b3 vertically upward and set through the slide plate 4d is installed on the movable plate 3b1 , the sliding plate 4d is equipped with a guide sleeve 3b4 sleeved on the guide post 3b3, the top of the clamp 3a is fixedly installed on the bottom surface of the movable plate 3b1, and the cylinder 3b2 pneumatically drives the movable plate 3b1 to move downward and drives it to be installed on the bottom surface of the movable plate 3b1 The clamp 3a moves downward, so that the two clamps 3a clamp the crank connecting rod placed in the groove 3a1, and the guide post 3b3 slides in the guide sleeve 3b4 so that the movable plate 3b1 is stable and does not rotate during the movement .

The milling device 5 includes a rotating device 5a arranged on both sides of the transmission device 4 and a milling cutter 5b installed on the output shaft of the rotating device 5a. The rotating device 5a includes a fixed mount 5a1, a motor 5a2 fixedly installed on the fixed mount 5a1 and The turntable 5a3 that is rotatably installed on the fixed frame 5a1, the output shaft of the motor 5a2 and the rotating shaft of the turntable 5a3 are connected through a synchronous belt transmission, and the side of the turntable 5a3 facing the transmission device 4 is equipped with a chuck 5a4 that follows the turntable 5a3 and rotates synchronously. The milling cutter 5b is installed on the chuck 5a4, and the motor 5a2 starts to drive the turntable 5a3 to rotate and drives the chuck 5a4 to rotate together so that the milling cutter 5b rotates to enter the working state. There is a preset processing distance between the facing milling cutters 5b. After the rod is fixed by the fixing device 3, it is transported by the transmission device 4 and passes through multiple pairs of milling cutters 5b for multiple milling processes.

The unloading device 6 includes a rebound plunger 6a, a horizontal moving device 6b and a vertical moving device 6c, the rebounding plunger 6a is installed on the output end of the horizontal moving device 6b, and the axial direction of the output shaft of the horizontal moving device 6b and the processing are completed The axial direction of the crank connecting rod shaft hole is consistent, the vertical moving device 6c is installed on the bracket 1a and the output end of the vertical moving device 6c is fixedly connected with the bottom surface of the horizontal moving device 6b, and the horizontal moving device 6b is a double-rod double-axis cylinder , the vertical moving device 6c is a single-axis cylinder equipped with a guiding device, and the guiding device includes a flat plate installed horizontally on the bottom surface of the horizontal moving device 6b and guide posts vertically installed at the four corners of the flat plate, and the guiding posts extend into the support 1a and can slide vertically in the bracket 1a, the single-axis cylinder is vertically installed inside the guide device, the output shaft of the single-axis cylinder is fixedly connected with the flat bottom surface of the guide device, and after the end face milling of the crank connecting rod is completed, the clip The tightening device 3b returns to the initial position to drive the clamp 3a installed on the bottom surface of the movable plate 3b1 to move upwards and release the crank connecting rod clamped by the clamp 3a, the crank connecting rod stays in the groove 3a1 below, and the rebound plunger 6a Under the action of the horizontal moving device 6b, it moves toward the direction of the crank connecting rod and extends into the two shaft holes of the crank connecting rod, and then the vertical moving device 6c drives the horizontal moving device 6b to move upward so that the rebound plunger 6a will crank the crank The connecting rod is lifted upwards from the clamp 3a, and the rebound plunger 6a is activated to push the crank connecting rod into the finished box.

The rebound plunger 6a includes a biaxial plunger 6a1 that can be inserted into the two shaft holes of the crank connecting rod and a rebound bracket 6a2 that is sleeved on the biaxial plunger 6a1, and the rebound bracket 6a2 can be mounted on the biaxial column. Sliding on the plug 6a1 and the sliding direction of the rebound bracket 6a2 is axially consistent with the output shaft of the horizontal moving device 6b, and a connection between the biaxial plunger 6a1 and the rebound bracket 6a2 is provided to connect the biaxial plunger 6a1 and the rebound bracket 6a2 The elastic device 6a3 is sleeved on the output shaft of the horizontal moving device 6b. The elastic device 6a3 is a pressure spring. The horizontal moving device 6b pushes the rebound plunger 6a towards the direction of the clamp 3a, and the biaxial plunger 6a1 is close to the concave The two shaft holes of the crank connecting rod in the slot 3a1, while the rebound bracket 6a2 abuts against the side of the clamp 3a, the horizontal moving device 6b continues to move forward so that the biaxial plunger 6a1 passes through the two shaft holes of the crank connecting rod, At the same time, the rebound bracket 6a2 stays on the side of the fixture 3a so that the elastic device 6a3 is compressed to generate a rebound force, and then the vertical moving device 6c is activated so that the biaxial plunger 6a1 lifts the crank connecting rod in the groove 3a1, and the rebound bracket simultaneously 6a2 moves upward and breaks away from the surface of the clamp 3a, and then the elastic device 6a3 rebounds so that the rebound bracket 6a2 slides on the biaxial plunger 6a1 towards the direction of the crank connecting rod and ejects the crank connecting rod from the biaxial plunger 6a1 Make it fly and fall into the finished product box.

The vibrating plate 2a continuously transports a large number of cranks and connecting rods placed therein to the first track 2b, and the cranks and connecting rods lie on the first track 2b and slide down to the turning platform 2c, and then the turning cylinder 2d is activated to turn the turning platform 2c over 90 The crank connecting rod that prevents on the turning platform 2c slides down on the second track 2e, and the crank connecting rod vertically falls on the second bottom plate 2e1 through the curved side plate 2e2 and the vertical side plate 2e3 provided on the second track 2e , and then the pushing device 2f pneumatically pushes the vertically arranged crank connecting rod into the clamp 3a, thereby completing automatic feeding, and the clamping device 3b starts to make the vertically symmetrically arranged clamp 3a move toward each other and clamp the crank connecting rod in In the groove 3a1, the fixing of the crank connecting rod is completed, and then the transmission device 4 starts to push the crank connecting rod to be processed to the middle of the milling device 5, and the milling cutter 5b and the rotating device 5a that drives the milling cutter 5b to rotate work together, Make the crank connecting rod pass through the multi-channel milling cutters 5b that are symmetrically arranged to make it go through multiple milling processes, the processed crank connecting rod moves to the side of the unloading device 6, and the clamping device 3b returns to the initial position to make the crank connecting rod The rod is released, and then the horizontal movement device 6b drives the rebound plunger 6a towards the crank connecting rod, the rebound bracket 6a2 abuts on the clamp 3a and causes the elastic device 6a3 to compress and the biaxial plunger 6a1 penetrates into the crank connecting rod. In the shaft hole, then the vertical moving device 6c is activated to lift the rebound plunger 6a upward so that the crank connecting rod is lifted out of the groove 3a1, and the rebound bracket 6a2 is separated from the side of the clamp 3a at the same time, and the biaxial plunger 6a1 and the rebound The elastic device 6a3 arranged between the brackets 6a2 rebounds so that the rebound bracket 6a2 ejects the crank connecting rod from the biaxial plunger 6a1 and makes it fly down into the finished product box, thereby completing the automatic unloading. The above is only a preferred embodiment of the present invention, and does not make any limitation to the technical scope of the present invention, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still valid. It belongs to the scope of the technical solution of the present invention.

Claims (1)

1. The double-face continuous milling machine for crank connecting rod is characterized in that: comprises table (1), feeding device (2), fixing device (3), transmission device (4), milling device (5) and The unloading device (6), the table (1) is provided with the support (1a) for fixedly installing the transmission device (4), the milling device (5) and the unloading device (6), and the fixing device (3) is installed on the loading The discharge port of the device (2) and the fixing device (3) are equipped with a transmission device (4) that drives the fixing device (3) to perform horizontal reciprocating motion. On both sides of the transmission device (4), there are multiple milling mills arranged opposite to each other. device (5), the end side of the transfer device (4) is provided with a discharge device (6); The fixing device (3) includes a clamp (3a) arranged symmetrically up and down and a clamping device (3b) that drives the clamp (3a) to move toward each other and clamps the crank connecting rod placed in the clamp (3a), and the clamp (3a) ) is a vertical plate whose width is smaller than the width of the end face of the crank connecting rod but greater than the width of the rod of the crank connecting rod. The opposite sides of the two clamps (3a) are provided with grooves (3a1) that can accommodate one side of the crank connecting rod. (3a) The side away from the feeding device (2) is provided with a connection device (3a2) that connects the upper and lower clamps (3a) so that they are always aligned up and down; The transmission device (4) includes a horizontal moving device (4a), a guide rail bracket (4b) and a slide rail (4c), and the horizontal moving device (4a) is arranged under the fixture (3a) and is fixedly installed on the table (1 ), the bottom end of the fixture (3a) is fixedly installed on the movable part of the horizontal moving device (4a), and the horizontal moving device (4a) is equipped with a guide rail bracket that is set vertically upward and is higher than the processing position of the milling device (5) (4b), the top of the guide rail bracket (4b) is equipped with a slide guide rail (4c) that is horizontally arranged and is consistent with the moving direction of the movable part of the horizontal moving device (4a), and the slide guide rail (4c) is equipped with a slide guide rail (4c) that can be positioned relative to the slide guide rail ( 4c) a sliding slide (4d), the clamping device (3b) is mounted on the slide (4d); The clamping device (3b) includes a movable plate (3b1) horizontally arranged below the slide plate (4d) and a cylinder (3b2) whose output shaft is installed vertically downward on the slide plate (4d), on the movable plate (3b1) A guide post (3b3) vertically upward and set through the slide plate (4d) is installed, a guide sleeve (3b4) sleeved on the guide post (3b3) is installed on the slide plate (4d), and the top of the clamp (3a) is fixedly installed on the bottom surface of the movable plate (3b1); The discharge device (6) includes a rebound plunger (6a), a horizontal movement device (6b) and a vertical movement device (6c), and the rebound plunger (6a) is installed at the output of the horizontal movement device (6b). end, the axial direction of the output shaft of the horizontal moving device (6b) is consistent with the axial direction of the finished crank connecting rod shaft hole, the vertical moving device (6c) is installed on the bracket (1a) and the vertical moving device (6c) The output end is fixedly connected with the bottom surface of the horizontal moving device (6b); The rebound plunger (6a) includes a biaxial plunger (6a1) that can extend into the two shaft holes of the crank connecting rod and a rebound bracket (6a2) sleeved on the biaxial plunger (6a1) , the rebound bracket (6a2) can slide on the biaxial plunger (6a1) and the sliding direction of the rebound bracket (6a2) is consistent with the output shaft axis of the horizontal moving device (6b), and the biaxial plunger (6a1) and An elastic device (6a3) connecting the biaxial plunger (6a1) and the rebound support (6a2) is arranged between the rebound brackets (6a2), and the elastic device (6a3) is sleeved on the output shaft of the horizontal movement device (6b) .