A press for mechanical manufacturing

Abstract

The present invention relates to the technical field of mechanical equipment, and specifically to a press for mechanical manufacturing, comprising a stamping bed, a stamping unit, and a demolding unit, wherein the stamping unit is fixedly arranged on the top of the stamping bed, and the demolding unit is fixedly arranged inside the stamping bed. In the process of the crankshaft rotating to drive the crank connecting rod to move downward, the jacking push rod extends toward the outside of the cylinder sleeve 2, and then, through the hinged action of the riding frame and the crank connecting rod, a thrust in a forward and downward angle is applied to the riding frame, so that in the process of the crankshaft driving the crank connecting rod to move downward, the crank connecting rod is suppressed by the thrust action to exert a backward extrusion force on the ram, thereby alleviating the problem of eccentric wear of the sliding parts installed between the ram and the stamping bed, improving the service life of the press, and reducing the maintenance cost of the press.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, in particular to a press for mechanical manufacturing. Background Art

[0002] Stamping is one of the common processes in the processing of some mechanical parts. It relies on the press and mold to apply external force to the material to cause plastic deformation or separation, thereby obtaining a workpiece of the desired shape and size.

[0003] Referring to a Chinese patent with application number 201911332991.2, a crank press is disclosed, in which a positioning bracket is arranged under the slider, and the positioning bracket also performs reciprocating linear motion to prevent the actual movement stroke of the slider from being greater than the set stroke, so that the slider moves smoothly and the stamping process has high precision. At the same time, workers can visually observe the guide column and the positioning bracket to determine whether there is any deviation in the slider stroke and movement state, which can effectively improve the yield rate during stamping. In the process of the above-mentioned press, the crankshaft drives the connecting rod to move downward. Since the crankshaft is rotating, the connecting rod cannot always maintain a vertical state. That is, there is a certain angle between the connecting rod and the upper mold mounting seat, which causes lateral extrusion of the upper mold mounting seat during the movement of the connecting rod. This lateral extrusion will cause eccentric wear of the sliding connection between the upper mold mounting seat and the stamping bed. For this reason, we propose a press for mechanical manufacturing to solve the above-mentioned technical problems. Summary of the Invention

[0004] The present invention provides the following technical solution: a press for mechanical manufacturing, comprising:

[0005] Stamping bed;

[0006] The punching unit is fixed on the top of the punching bed and is used for mechanical punching;

[0007] The demoulding unit is fixedly arranged inside the stamping bed and is used for demoulding the workpiece. The stamping unit is also used to drive the demoulding unit.

[0008] As a preferred solution of the present invention, the stamping unit includes:

[0009] The crankshaft is rotatably mounted on the top of the press bed through bearings;

[0010] The crank connecting rod is hinged to the middle connecting rod journal position of the crankshaft through a bearing bush. The bottom of the crank connecting rod is hinged to a pressure head through a bearing bush. The pressure head is slidably installed between the press bed. The back of the press bed is fixed with a power unit.

[0011] The path cam grooves are distributed on the left and right sides and are opened on the outer surface of the crankshaft. The opening angle of the path cam grooves is adapted to the connecting rod journal angle of the crankshaft.

[0012] As a preferred solution of the present invention, the stamping unit further includes:

[0013] The ejector pin is located on the back of the crankshaft and is symmetrically distributed about the central axis of the press bed;

[0014] Piston 1, fixedly mounted on the rear end of the outer wall of the push rod;

[0015] The cylinder sleeves are fixedly mounted on the top of the press bed, and the outer walls of the two pistons are respectively connected to the inner walls of the two cylinder sleeves in a sliding manner;

[0016] The bearing seats are fixed on the top rear end of the press bed, distributed on the left and right sides;

[0017] The swing shaft is rotatably mounted between the left and right bearing seats through bearings;

[0018] Cylinder sleeve 2, fixedly mounted on the middle of the outer wall of the swing shaft;

[0019] The second piston is slidably mounted inside the second cylinder sleeve;

[0020] A push rod is fixedly mounted on the inner wall of the second piston and passes through the interior of the second cylinder sleeve;

[0021] The riding frame is fixedly mounted on the end of the push rod away from the second piston, and the riding frame is hinged to the lower part of the crank connecting rod.

[0022] As a preferred solution of the present invention, the stamping unit further includes:

[0023] The oil pipe is connected to the input end of the cylinder sleeve 2 through a tee;

[0024] The valve is fixedly installed at the output end of the cylinder sleeve 1, and the output end thereof is fixedly connected to the end of the oil pipe away from the cylinder sleeve 2.

[0025] As a preferred solution of the present invention, the demoulding unit includes:

[0026] The placement cavity is opened on the front of the punch bed and extends into the interior thereof;

[0027] The receiving hole is provided at the top of the placement cavity and extends to the top of the punching bed workbench;

[0028] The top column is slidably installed inside the storage hole;

[0029] Support plate, fixedly installed at the bottom of the top column;

[0030] L-shaped pulling arms, distributed on the left and right, fixed on the rear end of the top of the pallet;

[0031] The eccentric blocks are symmetrically distributed about the central axis of the pendulum shaft and fixedly installed at both ends of the outer wall of the pendulum shaft, and their positions correspond one to one with the positions of the L-shaped pull arms;

[0032] A U-shaped groove is provided at the end of the eccentric block;

[0033] An axle pin is rotatably mounted inside the U-shaped groove, and a torsion spring is provided between the axle pin and the U-shaped groove;

[0034] The lever is fixedly mounted on the middle of the outer wall of the shaft pin;

[0035] The lifting rod is fixedly installed at the end of the lever away from the axle pin.

[0036] As a preferred solution of the present invention, the demoulding unit further includes:

[0037] The second spring is symmetrically distributed about the central axis of the placement cavity and is fixedly installed between the bottom of the supporting plate and the bottom wall of the placement cavity.

[0038] As a preferred solution of the present invention, the demoulding unit further includes:

[0039] The linear guide rails are fixedly mounted on the left and right walls of the placement chamber;

[0040] The linear slider is slidably mounted on the periphery of the linear guide rail, and the support plate is fixedly mounted between the left and right linear sliders.

[0041] As a preferred solution of the present invention, the power unit includes:

[0042] The power motor is fixedly installed on the back of the punching bed;

[0043] The driving pulley is fixedly installed on the output shaft of the power motor;

[0044] The driven pulley is fixedly mounted on one end of the crankshaft;

[0045] The power belt is sleeved on the outer periphery of the driving pulley and the driven pulley;

[0046] The flywheel is fixedly mounted on the end of the crankshaft away from the driven pulley.

[0047] As a preferred solution of the present invention, a spring 1 is provided inside the cylinder sleeve 1, and the spring 1 is fixedly installed between the back surface of the piston 1 and the rear inner side surface of the cylinder sleeve 1;

[0048] A ball is movably mounted on one end of the push rod close to the crankshaft, and the outer surface of the ball abuts against the cam surface of the path cam groove.

[0049] As a preferred solution of the present invention, a guide bracket is fixedly installed between the left wall and the right wall of the stamping bed, and the L-shaped pulling arm movably passes through the interior of the guide bracket and is slidably connected to the through hole of the guide bracket.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. In the present invention, in the process of the crankshaft rotating and driving the crank-connecting rod to move downward, the lifting push rod extends toward the outside of the cylinder liner 2, and then the riding frame is hinged with the crank-connecting rod to apply a thrust in a forward and downward angle to the riding frame, so that in the process of the crankshaft driving the crank-connecting rod to move downward, the thrust is used to suppress the crank-connecting rod from exerting a backward extrusion pressure on the ram, thereby alleviating the problem of eccentric wear of the sliding parts installed between the ram and the stamping bed, thereby improving the service life of the press and reducing the maintenance cost of the press.

[0052] 2. In the present invention, the riding frame will be driven upward by the upward reset of the crank connecting rod, and the connection between the push rod and the cylinder sleeve 2 will drive the swing shaft to rotate along the left and right bearing seats, so that the left and right eccentric blocks will rotate together, and the connection of the U-shaped groove will drive the axle pin, lever and lifting rod to rotate together until the outer wall of the lifting rod abuts against the lower surface of the bent part at the top of the L-shaped pull arm, pushing the L-shaped pull arm upward, and then driving the support plate and the top column to move upward, squeezing the bottom of the mechanical parts to facilitate their demolding.

[0053] 3. In the present invention, the eccentric block continues to rotate, and eventually, the lifting rod is separated from the lower surface of the bent part at the top of the L-shaped pull arm, and the rebound force of the two springs is released, pushing the support plate, the top column and the L-shaped pull arm to move downward and reset, thereby storing the top column inside the storage hole and will not interfere with the loading of the next mechanical part.

[0054] 4. In the present invention, when the crankshaft drives the crank-connecting rod to move downward for stamping, the push rod and the cylinder sleeve drive the pendulum shaft to rotate in the opposite direction along the left and right bearing seats, driving the eccentric block, U-shaped groove, axle pin, lever and lifting rod to rotate together. Finally, the U-shaped groove rotates to the periphery of the L-shaped pull arm, and the outer wall of the lifting rod is limited by the end of the bending part at the top of the L-shaped pull arm, pushing the lever and the axle pin to rotate along the inside of the U-shaped groove, causing the torsion spring between the axle pin and the U-shaped groove to accumulate force until the U-shaped groove is completely rotated from the periphery of the L-shaped pull arm to the bottom of its bending part. That is to say, during the reverse rotation of the eccentric block, no downward thrust is applied to the L-shaped pull arm. On the one hand, it can ensure the reverse rotation of the pendulum shaft, and on the other hand, it will not cause unnecessary extrusion to the L-shaped pull arm.

[0055] 5. In the present invention, after the U-shaped groove is completely rotated from the periphery of the L-shaped pull arm to the bottom of its bending part, the lifting rod is also separated from the end of the L-shaped pull arm. At this time, under the action of the torsion spring rebound force between the axle pin and the U-shaped groove, the lifting rod drives the lever and the axle pin to rotate in the opposite direction along the inside of the U-shaped groove, and the outer wall of the lifting rod contacts the periphery of the eccentric block to facilitate the next lifting of the pull arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic diagram of the structure of the present invention from a right front perspective;

[0057] Figure 2 This is a schematic diagram of the right rear top view of the structure of the present invention;

[0058] Figure 3 For the present invention Figure 2 Schematic diagram of the local expanded structure;

[0059] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of part A;

[0060] Figure 5 It is a schematic diagram of the side cross-section structure of the punching bed in the present invention;

[0061] Figure 6 Schematic diagram of the structure of the punching unit and the demoulding unit in the present invention;

[0062] Figure 7 For the present invention Figure 6 A schematic diagram of a partial cross-sectional structure;

[0063] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part B;

[0064] Figure 9 For the present invention Figure 7 Schematic diagram of the enlarged structure of part C;

[0065] Figure 10 Schematic diagram of the detailed structure of the eccentric block in the present invention;

[0066] Figure 11 Schematic diagram of the detailed structure of the L-shaped pull arm and the lifting rod in the present invention.

[0067] In the figure: 100, stamping bed; 200, stamping unit; 201, crankshaft; 202, crank connecting rod; 203, path cam groove; 204, push rod; 205, piston 1; 206, cylinder liner 1; 207, bearing seat; 208, swing shaft; 209, cylinder liner 2; 2010, piston 2; 2011, push rod; 2012, riding frame; 2013, oil pipe; 2014, valve; 2015, spring 1; 2016, ball bearing; 2017, pressure head; 300, Demolding unit; 301, placement cavity; 3001, storage hole; 302, top column; 303, support plate; 304, L-shaped pull arm; 305, eccentric block; 307, U-shaped groove; 308, axle pin; 309, lever; 3010, lifting rod; 3011, spring 2; 3012, linear guide rail; 3013, linear slider; 3014, guide bracket; 401, power motor; 402, driving pulley; 403, driven pulley; 404, power belt; 405, flywheel. DETAILED DESCRIPTION

[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0069] See also Figures 1 to 10 The technical solution provided by the present invention specifically includes the following embodiments:

[0070] A press for mechanical manufacturing includes a stamping bed 100, a stamping unit 200 and a demolding unit 300. The stamping unit 200 is fixedly arranged on the top of the stamping bed 100 and is used for mechanical stamping. The demolding unit 300 is fixedly arranged inside the stamping bed 100 and is used for demolding a workpiece. The stamping unit 200 is also used to drive the demolding unit 300.

[0071] For further details, please refer to Figure 2 、 Figure 5 and Figure 6 As shown:

[0072] The stamping unit 200 includes a crankshaft 201, a crank-connecting rod 202 and a path cam groove 203. The crankshaft 201 is rotatably mounted on the top of the stamping bed 100 through a bearing. The crank-connecting rod 202 is hinged to the middle connecting rod journal position of the crankshaft 201 through a bearing. A pressing head 2017 is hinged to the bottom of the crank-connecting rod 202 through a bearing. The pressing head 2017 is slidably mounted between the pressing head 201 and the stamping bed 100. A power unit is fixed to the back of the stamping bed 100. The path cam grooves 203 are distributed on the left and right sides and are opened on the outer surface of the crankshaft 201. The opening angle of the path cam grooves 203 is adapted to the angle of the connecting rod journal of the crankshaft 201.

[0073] The power unit includes a power motor 401, a driving pulley 402, a driven pulley 403, a power belt 404 and a flywheel 405. The power motor 401 is fixedly mounted on the back of the stamping bed 100, the driving pulley 402 is fixedly mounted on the output shaft of the power motor 401, the driven pulley 403 is fixedly mounted on one end of the crankshaft 201, the power belt 404 is sleeved on the outer periphery of the driving pulley 402 and the driven pulley 403, and the flywheel 405 is fixedly mounted on the end of the crankshaft 201 away from the driven pulley 403.

[0074] Specifically, the output shaft of the power motor 401 drives the active pulley 402 to rotate (see the attached manual). Figure 1The power belt 404 is driven to rotate under the power connection of the driven pulley 403, thereby driving the main journal and connecting rod journal of the crankshaft 201 together with the flywheel 405 to rotate. The rotation of the flywheel 405 generates rotational inertia, making the rotational potential energy of the crankshaft 201 stronger. The rotation of the crankshaft 201 further drives the ram 2017 to move downward through the crank-connecting rod 202 to perform stamping processing on the mechanical parts.

[0075] For further details, please refer to Figure 6 、 Figure 7 and Figure 8 As shown:

[0076] The stamping unit 200 also includes a push rod 204, a piston 205, a cylinder liner 206, a bearing seat 207, a swing shaft 208, a cylinder liner 209, a piston 2010, a push rod 2011, a riding frame 2012, an oil pipe 2013, a valve 2014 and a spring 2015. The push rod 204 is located on the back of the crankshaft 201 and is symmetrically distributed about the central axis of the stamping bed 100. The piston 205 is fixedly installed on the rear end of the outer wall of the push rod 204. A ball 2016 is movably installed on the end of the push rod 204 close to the crankshaft 201. The outer surface of the ball 2016 abuts the cam surface of the path cam groove 203. The cylinder liner 206 is fixedly installed on the top of the stamping bed 100 on the left and right. The outer walls of the two pistons 205 are respectively slidably connected to the inner walls of the two cylinder liners 206. The bearing seats 207 are fixedly installed on the top rear end of the stamping bed 100 on the left and right. The swing shaft 208 is rotatably installed between the left and right bearing seats 207 through a bearing, the cylinder sleeve 209 is fixedly installed in the middle of the outer wall of the swing shaft 208, the piston 2010 is slidably installed inside the cylinder sleeve 209, the push rod 2011 is fixedly installed on the inner wall of the piston 2010 and passes through the inside of the cylinder sleeve 209, the riding frame 2012 is fixedly installed on the end of the push rod 2011 away from the piston 2010, the riding frame 2012 is hinged to the lower part of the crank connecting rod 202, the oil pipe 2013 is connected to the input end of the cylinder sleeve 209 through a tee, the valve 2014 is fixedly installed on the output end of the cylinder sleeve 1 206, and its output end is fixedly connected to the end of the oil pipe 2013 away from the cylinder sleeve 209, and a spring 1 2015 is provided inside the cylinder sleeve 1 206, and the spring 1 2015 is fixedly installed between the back of the piston 1 205 and the rear inner side surface of the cylinder sleeve 1 206.

[0077] Specifically, the rotation of the crankshaft 201 also drives the left and right path cam grooves 203 to rotate together. Since the opening angle of the path cam groove 203 is adapted to the connecting rod journal angle of the crankshaft 201, that is, when the crankshaft 201 rotates and drives the crank connecting rod 202 to move downward, the path cam groove 203 continuously squeezes the ball 2016, thereby pushing the push rod 204 together with the piston 1 205, so that the piston 1 205 compresses the oil inside the cylinder liner 206 backward inside the cylinder liner 206. During this period, the spring 1 2015 is continuously compressed and stored, and the compressed oil inside the cylinder liner 206 is ballasted through the valve 2014 and the oil pipe 2013. The piston 2010 is pushed into the cylinder liner 209, thereby pushing the piston 2010 to move along the inner wall of the cylinder liner 209, and the lifting push rod 2011 is extended to the outside of the cylinder liner 209, and then the riding frame 2012 is applied with a forward and downward thrust through the hinged action of the crank connecting rod 202. In the process of the crankshaft 201 driving the crank connecting rod 202 to move downward, the crank connecting rod 202 is restrained from exerting a backward squeezing force on the ram 2017 through the thrust, thereby alleviating the problem of eccentric wear of the sliding parts installed between the ram 2017 and the stamping bed 100, thereby improving the service life of the press and reducing the maintenance cost of the press.

[0078] It should be noted that when the crank connecting rod 202 pushes the pressure head 2017 downward to reach the bottom dead center and completes the stamping of the mechanical parts, as the output shaft of the power motor 401 continues to rotate, the crankshaft 201 drives the crank connecting rod 202 and the pressure head 2017 to return upward. During this period, the squeezing effect of the path cam groove 203 on the ball 2016 gradually ends, and the rebound force of the spring 1 2015 is gradually released, pushing the piston 1 205, the push rod 204 and the ball 2016 to move forward, and at the same time, the oil inside the cylinder liner 209 is pumped back to the cylinder liner 1 2 06, causing the piston 2010 to drive the push rod 2011 to gradually retract into the cylinder liner 209, and then drive the riding frame 2012 to move together, so as not to interfere with the upward movement of the crank-connecting rod 202. It should be noted here that when the push rod 2011 retracts to the maximum, thereafter, as the crankshaft 201 continues to rotate, the cam surface of the path cam groove 203 squeezes the ball 2016 again. Similarly, the push rod 2011 extends to the periphery of the cylinder liner 209, so as not to interfere with the upward reset of the crank-connecting rod 202 to the top dead center position.

[0079] For further details, please refer to Figures 6 to 9 As shown:

[0080] The demoulding unit 300 includes a placement cavity 301, a storage hole 3001, a top column 302, a support plate 303, an L-shaped pull arm 304, an eccentric block 305, a U-shaped groove 307, an axle pin 308, a lever 309, a lifting rod 3010 and a spring 2 3011. The placement cavity 301 is opened on the front of the stamping bed 100 and extends to the inside thereof. The storage hole 3001 is opened at the top of the placement cavity 301 and extends to the top of the workbench of the stamping bed 100. The top column 302 is slidably installed in the storage hole 3001. The support plate 303 is fixedly installed at the bottom of the top column 302. The L-shaped pull arms 304 are fixedly installed on the top of the support plate 303 on the left and right. The eccentric blocks 305 are symmetrically distributed about the central axis of the swing shaft 208 and fixedly installed at both ends of the outer wall of the swing shaft 208, and their positions correspond one-to-one to the positions of the L-shaped pull arms 304. A U-shaped groove 307 is opened at the end of the eccentric block 305, and the axle pin 308 is rotatably installed inside the U-shaped groove 307. A torsion spring is arranged between the axle pin 308 and the U-shaped groove 307. The lever 309 is fixedly installed in the middle of the outer wall of the axle pin 308. The lifting rod 3010 is fixedly installed on the end of the lever 309 away from the axle pin 308. The second spring 3011 is symmetrically distributed about the central axis of the placement cavity 301 and fixedly installed between the bottom of the support plate 303 and the bottom wall of the placement cavity 301.

[0081] Specifically, during the upward resetting of the crank connecting rod 202, the riding frame 2012 will be driven to move upward together, and the connection between the push rod 2011 and the cylinder sleeve 209 will drive the swing shaft 208 to rotate along the left and right bearing seats 207, so that the left and right eccentric blocks 305 rotate together, and through the connection of the U-shaped groove 307, the axle pin 308, the lever 309 and the lifting rod 3010 are driven to rotate together until the outer wall of the lifting rod 3010 abuts against the lower surface of the top bending part of the L-shaped pull arm 304, pushing the L-shaped pull arm 304 upward, and then driving the support plate 303 and the top column 302 to move upward, squeezing the bottom of the mechanical parts to facilitate their demolding.

[0082] It should be noted that the support plate 303 moves upward and pulls up the two springs 2 3011 on the left and right to store force. As the eccentric block 305 continues to rotate, the lifting rod 3010 eventually separates from the lower surface of the bent part at the top of the L-shaped pull arm 304. The rebound force of the two springs 2 3011 is released, pushing the support plate 303, the top column 302 and the L-shaped pull arm 304 to move downward and reset, thereby storing the top column 302 inside the storage hole 3001 and not interfering with the loading of the next mechanical part. It should be noted here that when the crankshaft 201 drives the crank connecting rod 202 to move downward for the stamping process, it drives the riding frame 2012 to move downward, and the push rod 2011 and the cylinder sleeve 209 are driven The movable oscillating shaft 208 rotates in opposite directions along the left and right bearing seats 207, driving the eccentric block 305, U-shaped groove 307, axle pin 308, lever 309 and lifting rod 3010 to rotate together. Finally, the U-shaped groove 307 rotates to the periphery of the L-shaped pull arm 304, and the outer wall of the lifting rod 3010 is limited by the end of the bent part at the top of the L-shaped pull arm 304, pushing the lever 309 and axle pin 308 to rotate along the inside of the U-shaped groove 307, causing the torsion spring between the axle pin 308 and the U-shaped groove 307 to accumulate force until the U-shaped groove 307 is completely rotated from the periphery of the L-shaped pull arm 304 to the bottom of its bent part, and the lifting rod 3010 is also separated from the end of the L-shaped pull arm 304 (as shown in the attached manual). Figure 11 As shown in the figure), at this time, under the action of the torsion spring rebound force between the axle pin 308 and the U-shaped groove 307, the lifting rod 3010 drives the lever 309 and the axle pin 308 to rotate in the opposite direction along the inside of the U-shaped groove 307 until the outer wall of the lifting rod 3010 contacts the outer periphery of the eccentric block 305. That is to say, during the reverse rotation of the eccentric block 305, no downward thrust is applied to the L-shaped pull arm 304. On the one hand, the reverse rotation of the swing shaft 208 can be ensured, and at the same time, unnecessary extrusion will not be caused to the L-shaped pull arm 304.

[0083] For further details, please refer to Figure 9 As shown:

[0084] The demolding unit 300 also includes a linear guide rail 3012 and a linear slider 3013. The linear guide rail 3012 is fixedly installed on the left and right walls of the placement cavity 301. The linear slider 3013 is slidably installed on the outer periphery of the linear guide rail 3012. The support plate 303 is fixedly installed between the left and right linear sliders 3013.

[0085] Specifically, by setting up the sliding connection between the linear guide rail 3012 and the linear slider 3013, precise guiding is provided for the upward and downward movement of the support plate 303 and the L-shaped pull arm 304, ensuring the stability and accuracy of the upward and downward movement of the support plate 303 and the L-shaped pull arm 304.

[0086] For further details, please refer to Figure 7 As shown:

[0087] A guide bracket 3014 is fixedly installed between the left wall and the right wall of the stamping bed 100 . The L-shaped pulling arm 304 movably passes through the interior of the guide bracket 3014 and is slidably connected to the through hole of the guide bracket 3014 .

[0088] Specifically, by setting up a guide bracket 3014, it is used to provide lateral support for the L-shaped pull arm 304, thereby ensuring the stability of the top of the L-shaped pull arm 304. At the same time, the guide bracket 3014 is also used for the sliding guidance of the L-shaped pull arm 304, thereby ensuring the stability of the L-shaped pull arm 304 when moving up and down.

[0089] This scheme is a mechanical manufacturing press machine. When working, the output shaft of the power motor 401 drives the driving pulley 402 to rotate (see the attached manual). Figure 1 The crankshaft 201 is rotated in the direction indicated by the arrow, and the power belt 404 is driven to rotate under the power connection of the driven pulley 403, thereby driving the main journal and connecting rod journal of the crankshaft 201 together with the flywheel 405 to rotate. The rotation of the flywheel 405 generates rotational inertia, making the rotational potential energy of the crankshaft 201 stronger. The rotation of the crankshaft 201 further drives the ram 2017 to move downward through the crank connecting rod 202 to stamp the mechanical parts.

[0090] Furthermore, the rotation of the crankshaft 201 also drives the left and right path cam grooves 203 to rotate together. Since the opening angle of the path cam groove 203 is adapted to the connecting rod journal angle of the crankshaft 201, that is, when the crankshaft 201 rotates and drives the crank connecting rod 202 to move downward, the path cam groove 203 continuously squeezes the ball 2016, thereby pushing the rear push rod 204 together with the piston 1 205, so that the piston 1 205 compresses the oil inside the cylinder liner 206 backward inside the cylinder liner 206. During this period, the spring 1 2015 is continuously compressed and stored, and the compressed oil inside the cylinder liner 206 is ballasted through the valve 2014 and the oil pipe 2013. The piston 2010 is pushed into the interior of the second cylinder sleeve 209, thereby pushing the second piston 2010 to move along the inner wall of the second cylinder sleeve 209, and the lifting push rod 2011 is extended to the outside of the second cylinder sleeve 209, and then the riding frame 2012 is applied with a forward and downward thrust through the hinged action of the crank connecting rod 202. As a result, when the crankshaft 201 drives the crank connecting rod 202 to move downward, the crank connecting rod 202 is restrained from exerting a backward squeezing force on the ram 2017 by the thrust, thereby alleviating the problem of eccentric wear of the sliding part installed between the ram 2017 and the punching bed 100, thereby improving the service life of the press and reducing the maintenance cost of the press.

[0091] When the crank connecting rod 202 pushes the pressure head 2017 downward to reach the bottom dead center and completes the stamping of the mechanical parts, as the output shaft of the power motor 401 continues to rotate, the crankshaft 201 drives the crank connecting rod 202 and the pressure head 2017 to reset upward. During this period, the squeezing effect of the path cam groove 203 on the ball 2016 gradually ends, and the rebound force of the spring 1 2015 is gradually released, pushing the piston 1 205, the push rod 204 and the ball 2016 to move forward, and at the same time, the oil inside the cylinder liner 209 is pumped back into the cylinder liner 1 206. , causing the second piston 2010 to drive the push rod 2011 to gradually retract into the second cylinder liner 209, and then drive the riding frame 2012 to move together, so as not to interfere with the upward movement of the crank connecting rod 202. It should be noted here that when the push rod 2011 retracts to the maximum, thereafter, as the crankshaft 201 continues to rotate, the cam surface of the path cam groove 203 squeezes the ball 216 again, similarly causing the push rod 2011 to extend toward the periphery of the second cylinder liner 209, so as not to interfere with the upward return of the crank connecting rod 202 to the top dead center position;

[0092] During the upward reset of the crank connecting rod 202, the riding frame 2012 will be driven to move upward together, and the connection between the push rod 2011 and the cylinder sleeve 209 will drive the swing shaft 208 to rotate along the left and right bearing seats 207, so that the left and right eccentric blocks 305 rotate together, and the connection through the U-shaped groove 307 drives the shaft pin 308, the lever 309 and the lifting rod 3010 to rotate together until the outer wall of the lifting rod 3010 abuts against the lower surface of the top bend of the L-shaped pulling arm 304. The L-shaped pull arm 304 is pushed up, thereby driving the support plate 303 and the top column 302 to move upward, squeezing the bottom of the mechanical part to facilitate its demoulding. At the same time, the support plate 303 moves up and pulls up the two springs 3011 on the left and right to store force. As the eccentric block 305 continues to rotate, the lifting rod 3010 is finally separated from the lower surface of the bent part at the top of the L-shaped pull arm 304. The rebound force of the two springs 3011 is released, pushing the support plate 303, the top column 302 and the L-shaped pull arm 304 to move downward to restore the original shape. The top column 302 is stored in the storage hole 3001, which will not interfere with the loading of the next mechanical part. It should be noted that when the crankshaft 201 drives the crank connecting rod 202 to move downward for stamping, it drives the riding frame 2012 to move downward, and drives the swing shaft 208 to rotate in the opposite direction along the left and right bearing seats 207 through the push rod 2011 and the cylinder sleeve 209, driving the eccentric block 305, U-shaped groove 307, shaft pin 308, lever 309 and lifting rod 3010 to rotate together. The U-shaped groove 307 rotates to the outer periphery of the L-shaped arm 304, and the outer wall of the lifting rod 3010 is limited by the end of the bent part of the top of the L-shaped arm 304, pushing the lever 309 and the shaft pin 308 to rotate along the inside of the U-shaped groove 307, causing the torsion spring between the shaft pin 308 and the U-shaped groove 307 to accumulate force until the U-shaped groove 307 is completely rotated from the outer periphery of the L-shaped arm 304 to the bottom of its bent part, and the lifting rod 3010 is also separated from the end of the L-shaped arm 304 (as shown in the attached manual). Figure 11 As shown in the figure), at this time, under the action of the torsion spring rebound force between the axle pin 308 and the U-shaped groove 307, the lifting rod 3010 drives the lever 309 and the axle pin 308 to rotate in the opposite direction along the inside of the U-shaped groove 307 until the outer wall of the lifting rod 3010 contacts the outer periphery of the eccentric block 305. That is to say, during the reverse rotation of the eccentric block 305, no downward thrust is applied to the L-shaped pull arm 304. On the one hand, the reverse rotation of the swing shaft 208 can be ensured, and at the same time, unnecessary extrusion will not be caused to the L-shaped pull arm 304.

[0093] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A press for mechanical manufacturing, characterized in that: include: Punch bed (100); A punching unit (200) is fixedly arranged on the top of the punching bed (100) and is used for mechanical punching. The punching unit (200) includes: A crankshaft (201) is rotatably mounted on the top of the press bed (100) via a bearing; A crank connecting rod (202) is hinged to a middle connecting rod journal position of a crankshaft (201) via a bearing bush, a pressing head (2017) is hinged to the bottom of the crank connecting rod (202) via the bearing bush, the pressing head (2017) is slidably mounted between the pressing head (2017) and the punching bed (100), and a power unit is fixedly provided on the back of the punching bed (100); Path cam grooves (203) are distributed on the left and right sides and are opened on the outer surface of the crankshaft (201), and the opening angle of the path cam grooves (203) is adapted to the angle of the connecting rod journal of the crankshaft (201); The stamping unit (200) further comprises: A push rod (204) is located on the back of the crankshaft (201) and is symmetrically distributed about the central axis of the punching bed (100); Piston 1 (205), fixedly mounted on the rear end of the outer wall of the push rod (204); Cylinder sleeves (206) are fixedly mounted on the top of the stamping bed (100) and are distributed on the left and right sides. The outer walls of the two pistons (205) are slidably connected to the inner walls of the two cylinder sleeves (206) respectively. Bearing seats (207) are fixedly mounted on the top rear end of the punching bed (100) and are distributed on the left and right sides; The swing shaft (208) is rotatably mounted between the left and right bearing seats (207) via a bearing; Cylinder sleeve 2 (209), fixedly mounted on the middle portion of the outer wall of the swing shaft (208); A second piston (2010) is slidably mounted inside a second cylinder sleeve (209); A push rod (2011) is fixedly mounted on the inner wall of the second piston (2010) and passes through the interior of the second cylinder sleeve (209); A riding frame (2012) is fixedly mounted on an end of the push rod (2011) away from the second piston (2010), and the riding frame (2012) is hinged to the lower portion of the crank connecting rod (202); The stamping unit (200) further comprises: The oil pipe (2013) is connected to the input end of the second cylinder sleeve (209) through a tee; A valve (2014) is fixedly mounted on the output end of the first cylinder sleeve (206), and the output end thereof is fixedly connected to an end of the oil pipe (2013) away from the second cylinder sleeve (209); The demoulding unit (300) is fixedly arranged inside the punching bed (100) and is used for demoulding the workpiece. The punching unit (200) is also used to drive the demoulding unit (300).

2. A press for mechanical manufacturing according to claim 1, characterized in that: The demoulding unit (300) comprises: The placement cavity (301) is formed on the front of the punching bed (100) and extends into the interior thereof; A receiving hole (3001) is provided at the top of the placement cavity (301) and extends to the top of the workbench of the punching bed (100); A top column (302) is slidably mounted inside the receiving hole (3001); A supporting plate (303) is fixedly mounted on the bottom of the top column (302); L-shaped pull arms (304) are fixedly mounted on the top rear end of the support plate (303) in a left and right distribution; The eccentric blocks (305) are symmetrically distributed about the central axis of the swing shaft (208) and fixedly mounted on both ends of the outer wall of the swing shaft (208), and their positions correspond to the positions of the L-shaped pull arms (304); A U-shaped groove (307) is provided at the end of the eccentric block (305); An axle pin (308) is rotatably mounted inside the U-shaped groove (307), and a torsion spring is provided between the axle pin (308) and the U-shaped groove (307); A lever (309) is fixedly mounted on the middle portion of the outer wall of the shaft pin (308); The lifting rod (3010) is fixedly mounted on one end of the lever (309) away from the axle pin (308).

3. A press for mechanical manufacturing according to claim 2, characterized in that: The demoulding unit (300) further includes: The second spring (3011) is symmetrically distributed about the central axis of the placement cavity (301) and is fixedly installed between the bottom of the support plate (303) and the bottom wall of the placement cavity (301).

4. A press for mechanical manufacturing according to claim 3, characterized in that: The demoulding unit (300) further includes: A linear guide rail (3012) is fixedly mounted on the left and right walls of the placement chamber (301); The linear slider (3013) is slidably mounted on the periphery of the linear guide rail (3012), and the support plate (303) is fixedly mounted between the left and right linear sliders (3013).

5. A press for mechanical manufacturing according to claim 4, characterized in that: The power unit comprises: A power motor (401) is fixedly mounted on the back of the punching bed (100); A driving pulley (402) is fixedly mounted on the output shaft of the power motor (401); A driven pulley (403) fixedly mounted on one end of the crankshaft (201); A power belt (404) is sleeved on the periphery of the driving pulley (402) and the driven pulley (403); The flywheel (405) is fixedly mounted on an end of the crankshaft (201) away from the driven pulley (403).

6. A press for mechanical manufacturing according to claim 5, characterized in that: A spring 1 (2015) is provided inside the cylinder sleeve 1 (206), and the spring 1 (2015) is fixedly installed between the back surface of the piston 1 (205) and the rear inner surface of the cylinder sleeve 1 (206); A ball (2016) is movably mounted on one end of the push rod (204) close to the crankshaft (201), and the outer surface of the ball (2016) abuts against the cam surface of the path cam groove (203).

7. A press for mechanical manufacturing according to claim 5, characterized in that: A guide bracket (3014) is fixedly installed between the left wall and the right wall of the punching bed (100), and the L-shaped pulling arm (304) movably passes through the interior of the guide bracket (3014) and is slidably connected to the through hole of the guide bracket (3014).

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