Press machine for mechanical manufacturing

Abstract

The invention relates to the technical field of mechanical equipment, in particular to a press machine for mechanical manufacturing, which comprises a stamping lathe bed, a stamping unit and a demoulding unit, the stamping unit is fixedly arranged at the top of the stamping lathe bed, and the demoulding unit is fixedly arranged in the stamping lathe bed. In the process that the crankshaft rotates to drive the crank connecting rod to move downwards, the jacking push rod extends towards the outer portion of the second cylinder sleeve, then pushing force of a forward and downward angle is applied to the riding frame through the hinging effect of the riding frame and the crank connecting rod, and therefore in the process that the crankshaft drives the crank connecting rod to move downwards, pushing force is applied to the riding frame. And the backward extrusion force generated by the crank connecting rod on the pressure head is inhibited through the thrust effect, so that the problem of eccentric wear of a sliding piece mounted between the pressure head and the punching machine body is relieved, the service life of the press machine is prolonged, and meanwhile, the maintenance cost of the press machine is reduced.

Description

Technical Field

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

[0002] Stamping is one of the common processes in the processing of some mechanical parts. By applying external forces to materials with a press and a mold, plastic deformation or separation is caused to obtain workpieces with the required shapes and sizes.

[0003] Referring to a Chinese patent with the application number 201911332991.2, a crank press is disclosed. A positioning support is arranged below the slider, and the positioning support also makes a reciprocating linear motion to prevent the actual movement stroke of the slider from being greater than the set stroke, making the slider move smoothly and having high precision during stamping processing. At the same time, workers can visually observe the guide pillars and the positioning support to judge whether there are deviations in the slider stroke and motion state, which can effectively improve the qualified product rate during stamping processing. During the process of the crankshaft driving the connecting rod to move downward, since the connecting rod cannot always maintain a vertical state during the rotation of the crankshaft, that is to say, there is a certain angle between the connecting rod and the upper die mounting seat, resulting in lateral extrusion of the upper die mounting seat during the movement of the connecting rod. This lateral extrusion will cause uneven wear of the sliding connection between the upper die mounting seat and the stamping bed body. For this reason, we propose a press for mechanical manufacturing to solve the above technical problems. Summary of the Invention

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

[0005] A stamping bed body;

[0006] A stamping unit, fixedly arranged on the top of the stamping bed body for mechanical stamping;

[0007] A demoulding unit, fixedly arranged inside the stamping bed body for workpiece demoulding, and 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] A crankshaft, rotatably installed on the top of the stamping bed body through bearings;

[0010] A crank connecting rod, hinged to the middle connecting rod journal part of the crankshaft through a bearing bush. The bottom of the crank connecting rod is hinged with a punch head through a bearing bush. The punch head is slidably installed between the punch head and the stamping bed body, and a power unit is fixedly arranged on the back of the stamping bed body;

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

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

[0013] A push rod, located at the back of the crankshaft and symmetrically distributed about the central axis of the stamping bed body on the left and right;

[0014] A first piston, fixedly installed at the rear end of the outer wall of the push rod;

[0015] A first cylinder liner, fixedly installed at the top of the stamping bed body in a left-right distribution, and the outer walls of the two first pistons are respectively slidably connected to the inner walls of the two first cylinder liners;

[0016] Bearing seats, fixedly installed at the rear end of the top of the stamping bed body in a left-right distribution;

[0017] A swing shaft, rotatably installed between the two left and right bearing seats through bearings;

[0018] A second cylinder liner, fixedly installed in the middle of the outer wall of the swing shaft;

[0019] A second piston, slidably installed inside the second cylinder liner;

[0020] A push rod, fixedly installed on the inner wall of the second piston and passing through the inside of the second cylinder liner;

[0021] A riding bracket, fixedly installed at one end of the push rod away from the second piston, and the riding bracket is hinged to the lower part of the crank connecting rod.

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

[0023] An oil pipe, connected to the input end of the second cylinder liner through a tee;

[0024] A valve, fixedly installed at the output end of the first cylinder liner, and its output end is fixedly connected to the end of the oil pipe away from the second cylinder liner.

[0025] As a preferred embodiment of the present invention, the demolding unit includes:

[0026] A placement cavity, opened on the front of the stamping bed body and extending into its interior;

[0027] A storage hole, opened at the top of the placement cavity and extending to the top of the working table of the stamping bed body;

[0028] A top column, slidably installed inside the storage hole;

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

[0030] L-shaped pull arms, fixedly installed at the rear end of the top of the support plate in a left-right distribution;

[0031] Eccentric blocks, symmetrically distributed about the central axis of the swing shaft and fixedly installed at both ends of the outer wall of the swing shaft, and the positions correspond to the positions of the L-shaped pull arms one by one;

[0032] U-shaped groove, which is opened at the end of the eccentric block;

[0033] Axle pin, which is rotatably installed inside the U-shaped groove, and a torsion spring is arranged between the axle pin and the U-shaped groove;

[0034] Lever, which is fixedly installed in the middle of the outer wall of the axle pin;

[0035] Picking rod, which is fixedly installed at one end of the lever away from the axle pin.

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

[0037] Second spring, which is fixedly installed symmetrically about the central axis of the placement cavity between the bottom of the support plate and the bottom wall of the placement cavity.

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

[0039] Linear guide rail, which is fixedly installed on the left wall and the right wall of the placement cavity;

[0040] Linear slider, which is slidably installed outside the linear guide rail, and the support plate is fixedly installed between the left and right linear sliders.

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

[0042] Power motor, which is fixedly installed on the back of the stamping machine body;

[0043] Driving pulley, which is fixedly installed on the output shaft of the power motor;

[0044] Driven pulley, which is fixedly installed at one end of the crankshaft;

[0045] Power belt, which is sleeved outside the driving pulley and the driven pulley;

[0046] Flywheel, which is fixedly installed at the end of the crankshaft away from the driven pulley.

[0047] As a preferred solution of the present invention, a first spring is arranged inside the first cylinder liner, and the first spring is fixedly installed between the back of the first piston and the inner side surface of the rear part of the first cylinder liner;

[0048] A ball is movably installed at one end of the ejector 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 guiding bracket is fixedly installed between the left wall and the right wall of the stamping machine body, and the L-shaped pulling arm movably penetrates through the inside of the guiding bracket and is slidably connected with the through hole of the guiding bracket.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] 1. In the present invention, during the process of the crankshaft rotating to drive the crank connecting rod to move downward, the jacking push rod extends towards the outside of the second cylinder liner. Subsequently, through the hinged action between the saddle and the crank connecting rod, a thrust force at a forward and downward angle is applied to the saddle. Thus, during the process of the crankshaft driving the crank connecting rod to move downward, this thrust force is used to inhibit the backward extrusion force generated by the crank connecting rod on the punch head, thereby alleviating the problem of uneven wear of the sliding parts installed between the punch head and the press bed, improving the service life of the press, and simultaneously reducing the maintenance cost problem of the press.

[0052] 2. In the present invention, during the upward reset of the crank connecting rod, it will drive the saddle to move upward together. And due to the connection between the push rod and the second cylinder liner, it will drive the swing shaft to rotate along the left and right bearing seats, causing the left and right eccentric blocks to rotate together. And through the connection of the U-shaped groove, it drives the pin, lever, and pick rod to rotate together until the outer wall of the pick rod abuts against the lower surface of the bent part at the top of the L-shaped pull arm, jacking up the L-shaped pull arm, and then driving the support plate and the ejector pin to move upward to extrude the bottom of the mechanical part, facilitating its demolding.

[0053] 3. In the present invention, as the eccentric block continues to rotate, finally, the pick rod disengages from the lower surface of the bent part at the top of the L-shaped pull arm, and the resilience of the two second springs is released, pushing the support plate, the ejector pin, and the L-shaped pull arm to move downward and reset, thereby retracting the ejector pin into the receiving hole and not interfering with the feeding of the next mechanical part.

[0054] 4. In the present invention, during the stamping process when the crankshaft drives the crank connecting rod to move downward, through the push rod and the second cylinder liner, it drives the swing shaft to rotate reversely along the left and right bearing seats, driving the eccentric block, U-shaped groove, pin, lever, and pick 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 pick rod is limited by the end of the bent part at the top of the L-shaped pull arm, pushing the lever and the pin to rotate along the inside of the U-shaped groove, causing the torsion spring between the pin and the U-shaped groove to store energy. Until the U-shaped groove completely rotates from the periphery of the L-shaped pull arm to the bottom of its bent part, that is to say, during the reverse rotation of the eccentric block, it will not apply a downward thrust to the L-shaped pull arm. On the one hand, it can ensure the reverse rotation of the swing shaft, and at the same time, it will not cause unnecessary extrusion to the L-shaped pull arm.

[0055] 5. In the present invention, after the U-shaped groove completely rotates from the periphery of the L-shaped pull arm to the bottom of its bent part, the pick rod also separates from the end of the L-shaped pull arm. At this time, under the resilience of the torsion spring between the pin and the U-shaped groove, the pick rod drives the lever and the pin to rotate reversely along the inside of the U-shaped groove, and the outer wall of the pick rod contacts the periphery of the eccentric block to facilitate the upward lifting of the pull arm next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic structural diagram of the right front view of the present invention;

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

[0058] Figure 3 In the present invention Figure 2 The partial unfolded structure schematic diagram;

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

[0060] Figure 5 It is a schematic diagram of the side sectional structure of the stamping bed body in the present invention;

[0061] Figure 6 It is a schematic diagram of the structures of the stamping unit and the demolding unit in the present invention;

[0062] Figure 7 In the present invention Figure 6 The partial sectional structure schematic diagram;

[0063] Figure 8 In the present invention Figure 7 The enlarged structure schematic diagram of part B;

[0064] Figure 9 In the present invention Figure 7 The enlarged structure schematic diagram of part C;

[0065] Figure 10 It is a schematic diagram of the detailed structure of the eccentric block in the present invention;

[0066] Figure 11 It is a schematic diagram of the detailed structures of the L-shaped pulling arm and the picking rod in the present invention.

[0067] In the figure: 100, stamping bed body; 200, stamping unit; 201, crankshaft; 202, crank connecting rod; 203, path cam groove; 204, ejector rod; 205, piston I; 206, cylinder sleeve I; 207, bearing seat; 208, swing shaft; 209, cylinder sleeve II; 2010, piston II; 2011, push rod; 2012, riding bracket; 2013, oil pipe; 2014, valve; 2015, spring I; 2016, ball; 2017, pressure head; 300, demolding unit; 301, placement cavity; 3001, receiving hole; 302, ejector post; 303, support plate; 304, L-shaped pulling arm; 305, eccentric block; 307, U-shaped groove; 308, pin; 309, lever; 3010, picking rod; 3011, spring II; 3012, linear guide rail; 3013, linear slider; 3014, guiding bracket; 401, power motor; 402, driving pulley; 403, driven pulley; 404, power belt; 405, flywheel. Detailed implementation manners

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0069] Please refer to Figures 1 - 10 , the technical solutions provided by the present invention specifically include 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 for mechanical stamping. The demolding unit 300 is fixedly arranged inside the stamping bed 100 for workpiece demolding. The stamping unit 200 is also used to drive the demolding unit 300.

[0071] Furthermore, specifically referring to Figure 2 , Figure 5 and Figure 6 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 installed on the top of the stamping bed 100 through bearings. The crank connecting rod 202 is hinged to the middle connecting rod journal part of the crankshaft 201 through a bearing bush. The bottom of the crank connecting rod 202 is hinged with a punch head 2017 through a bearing bush. The punch head 2017 is slidably installed between the punch head 2017 and the stamping bed 100. A power unit is fixedly arranged on the back of the stamping bed 100. The path cam grooves 203 are distributed left and right on the outer surface of the crankshaft 201. The opening angle of the path cam groove 203 is adapted to the connecting rod journal angle 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 installed on the back of the stamping bed 100. The driving pulley 402 is fixedly installed on the output shaft of the power motor 401. The driven pulley 403 is fixedly installed at one end of the crankshaft 201. The power belt 404 is sleeved around the driving pulley 402 and the driven pulley 403. The flywheel 405 is fixedly installed at the end of the crankshaft 201 away from the driven pulley 403.

[0074] Specifically, the output shaft of the power motor 401 drives the driving pulley 402 to rotate (as shown in the attached drawings of the specification Figure 1in the rotation direction shown by the arrow), and drives the power belt 404 to rotate under the power connection of the driven pulley 403, and then drives the main journal and connecting rod journal of the crankshaft 201 to rotate together with the flywheel 405. The rotation inertia is generated by the rotation of the flywheel 405, making the rotational potential energy of the crankshaft 201 stronger. When the crankshaft 201 rotates, it further drives the ram 2017 to move downward through the crank connecting rod 202 to stamp and process mechanical parts.

[0075] Further, specifically referring to Figure 6 , Figure 7 and Figure 8 as shown:

[0076] The stamping unit 200 further includes a push rod 204, a first piston 205, a first cylinder liner 206, a bearing seat 207, a swing shaft 208, a second cylinder liner 209, a second piston 2010, a push rod 2011, a riding frame 2012, a tubing 2013, a valve 2014 and a first spring 2015. The push rod 204 is located at the back of the crankshaft 201 and is symmetrically distributed about the central axis of the stamping bed 100. The first piston 205 is fixedly installed at the rear end of the outer wall of the push rod 204. A ball 2016 is movably installed at one end of the push rod 204 close to the crankshaft 201. The outer surface of the ball 2016 abuts against the cam surface of the path cam groove 203. The first cylinder liners 206 are fixedly installed at the top of the stamping bed 100 in a left-right distribution. The outer walls of the two first pistons 205 are respectively slidably connected to the inner walls of the two first cylinder liners 206. The bearing seats 207 are fixedly installed at the rear end of the top of the stamping bed 100 in a left-right distribution. The swing shaft 208 is rotatably installed between the left and right bearing seats 207 through bearings. The second cylinder liner 209 is fixedly installed in the middle of the outer wall of the swing shaft 208. The second piston 2010 is slidably installed inside the second cylinder liner 209. The push rod 2011 is fixedly installed on the inner wall of the second piston 2010 and penetrates through the inside of the second cylinder liner 209. The riding frame 2012 is fixedly installed at one end of the push rod 2011 away from the second piston 2010. The riding frame 2012 is hinged to the lower part of the crank connecting rod 202. The tubing 2013 is connected to the input end of the second cylinder liner 209 through a tee. The valve 2014 is fixedly installed at the output end of the first cylinder liner 206, and its output end is fixedly connected to one end of the tubing 2013 away from the second cylinder liner 209. A first spring 2015 is arranged inside the first cylinder liner 206. The first spring 2015 is fixedly installed between the back of the first piston 205 and the inner side surface of the rear part of the first cylinder liner 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, in the process of the crankshaft 201 rotating and driving the crank connecting rod 202 to move downward, the path cam groove 203 continuously squeezes the ball 2016, so that the rear push rod 204 together with the piston 1 205 causes the piston 1 205 to compress the oil inside the cylinder sleeve 1 206 backward inside the cylinder sleeve 1 206. During this period, the spring 1 2015 is continuously compressed and stored, and the compressed oil inside the cylinder sleeve 1 206 is ballasted through the valve 2014 and the oil pipe 2013. The piston 2010 is pushed into the cylinder sleeve 209, thereby pushing the piston 2010 to move along the inner wall of the cylinder sleeve 209, and the lifting push rod 2011 is extended to the outside of the cylinder sleeve 209, and then the riding frame 2012 is applied with a thrust in a forward and downward angle through the hinged action of the crank connecting rod 202, so that 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 pressure on the ram 2017 through the thrust action, 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 lower dead point to complete 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 2 06, causing the piston 2010 to drive the push rod 2011 to gradually retract into the cylinder sleeve 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 sleeve 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 - 9 As shown:

[0080] The demolding 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, a shaft pin 308, a lever 309, a pick rod 3010, and a second spring 3011. The placement cavity 301 is opened on the front surface of the stamping machine body 100 and extends into its interior. 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 machine body 100. The top column 302 is slidably installed inside 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 at the rear end of the top of the support plate 303 in a left-right distribution. The eccentric blocks 305 are symmetrically distributed about the central axis of the swing shaft 208 and are fixedly installed at both ends of the outer wall of the swing shaft 208, and their positions correspond one by one to the positions of the L-shaped pull arms 304. The U-shaped groove 307 is opened at the end of the eccentric block 305. The shaft pin 308 is rotatably installed inside the U-shaped groove 307. A torsion spring is provided between the shaft pin 308 and the U-shaped groove 307. The lever 309 is fixedly installed at the middle of the outer wall of the shaft pin 308. The pick rod 3010 is fixedly installed at one end of the lever 309 away from the shaft pin 308. The second springs 3011 are symmetrically distributed about the central axis of the placement cavity 301 and are fixedly installed between the bottom of the support plate 303 and the bottom wall of the placement cavity 301.

[0081] Specifically, during the upward reset of the crank connecting rod 202, it will drive the riding frame 2012 to move upward together. And due to the connection of the push rod 2011 and the second cylinder sleeve 209, it will drive the swing shaft 208 to rotate along the left and right bearing seats 207, causing the left and right eccentric blocks 305 to rotate together, and driving the shaft pin 308, the lever 309, and the pick rod 3010 to rotate together through the connection of the U-shaped groove 307 until the outer wall of the pick rod 3010 abuts against the lower surface of the bent part at the top 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 to squeeze the bottom of the mechanical part, facilitating its demolding.

[0082] It should be noted that as the pallet 303 moves upward to stretch and store the elastic force of the two left and right springs two 3011, as the eccentric block 305 continues to rotate, finally, the pick lever 3010 disengages from the lower surface of the bent part at the top of the L-shaped pull arm 304, and the elastic force of the two springs two 3011 is released, pushing the pallet 303, the top column 302, and the L-shaped pull arm 304 to move downward and reset, so as to store the top column 302 inside the storage hole 3001, without interfering with the feeding 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 stamping, it drives the riding frame 2012 to move downward, and drives the swing shaft 208 to rotate in the opposite direction along the two left and right bearing seats 207 through the push rod 2011 and the cylinder sleeve two 209, driving the eccentric block 305, the U-shaped groove 307, the shaft pin 308, the lever 309, and the pick lever 3010 to rotate together. Finally, the U-shaped groove 307 rotates to the outside of the L-shaped pull arm 304, and the outer wall of the pick lever 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 the shaft pin 308 to rotate along the inside of the U-shaped groove 307, resulting in the torsion spring between the shaft pin 308 and the U-shaped groove 307 storing elastic force. Until the U-shaped groove 307 completely rotates from the outside of the L-shaped pull arm 304 to the bottom of its bent part, the pick lever 3010 also separates from the end of the L-shaped pull arm 304 (as shown in the attached Figure 11 drawing), at this time, under the action of the elastic force of the torsion spring between the shaft pin 308 and the U-shaped groove 307, the pick lever 3010 drives the lever 309 and the shaft pin 308 to rotate in the opposite direction along the inside of the U-shaped groove 307 until the outer wall of the pick lever 3010 contacts the outer periphery of the eccentric block 305. That is to say, during the reverse rotation of the eccentric block 305, it will not apply a downward thrust to the L-shaped pull arm 304. On the one hand, it can ensure the reverse rotation of the swing shaft 208, and at the same time, it will not cause unnecessary extrusion to the L-shaped pull arm 304.

[0083] Furthermore, specifically referring to Figure 9 as shown:

[0084] The demoulding unit 300 further 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, and the linear slider 3013 is slidably installed on the periphery of the linear guide rail 3012. The pallet 303 is fixedly installed between the left and right linear sliders 3013.

[0085] Specifically, through the sliding connection of the linear guide rail 3012 and the linear slider 3013, it provides an accurate guiding effect for the upward and downward movement of the pallet 303 and the L-shaped pull arm 304, ensuring the stability and accuracy of the up and down movement of the pallet 303 and the L-shaped pull arm 304.

[0086] Furthermore, specifically referring to Figure 7 as shown:

[0087] A guiding bracket 3014 is fixedly installed between the left wall and the right wall of the stamping bed body 100. The L-shaped pull arm 304 movably penetrates through the inside of the guiding bracket 3014 and is slidably connected to the through hole of the guiding bracket 3014.

[0088] Specifically, by setting the guiding bracket 3014, the effect of laterally supporting the L-shaped pull arm 304 is achieved, ensuring the stability of the top of the L-shaped pull arm 304. At the same time, the guiding bracket 3014 also plays a role in sliding guidance for the L-shaped pull arm 304, ensuring the stability of the up and down movement of the L-shaped pull arm 304.

[0089] When a press for mechanical manufacturing in this solution is working, the output shaft of the power motor 401 drives the driving pulley 402 to rotate (the rotation direction is as shown by the arrow in the attached instructions of the specification), and drives the power belt 404 to rotate under the power connection of the driven pulley 403, thereby driving the main journal and the connecting rod journal of the crankshaft 201 together with the flywheel 405 to rotate. By the rotational inertia generated by the rotation of the flywheel 405, the rotational potential energy of the crankshaft 201 becomes stronger. When the crankshaft 201 rotates, it further drives the ram 2017 to move downward through the crank connecting rod 202 to stamp and process mechanical parts; Figure 1

[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 adaptively set to the angle of the connecting rod journal of the crankshaft 201, that is, during the process of the crankshaft 201 rotating and driving 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 one 205, causing the piston one 205 to compress the oil in the cylinder liner one 206 backward inside the cylinder liner one 206. During this period, the spring one 2015 is continuously compressed and stores energy, and the oil compressed inside the cylinder liner one 206 is then pressed into the inside of the cylinder liner two 209 through the valve 2014 and the oil pipe 2013, thereby pushing the piston two 2010 to move along the inner wall of the cylinder liner two 209, and the jacking push rod 2011 extends out of the cylinder liner two 209. Then, through the hinged action of the riding frame 2012 and the crank connecting rod 202, a forward and downward angle thrust is applied to the riding frame 2012. Thus, during the process of the crankshaft 201 driving the crank connecting rod 202 to move downward, through the action of this thrust, the backward extrusion force generated by the crank connecting rod 202 on the ram 2017 is inhibited, thereby alleviating the problem of uneven wear of the sliding parts installed between the ram 2017 and the stamping bed body 100, improving the service life of the press, and at the same time reducing the maintenance cost problem of the press;

[0091] When the crank connecting rod 202 pushes down the punch head 2017 to the bottom dead center to complete the stamping of mechanical parts, as the output shaft of the power motor 401 continues to rotate, the crankshaft 201 drives the crank connecting rod 202 together with the punch head 2017 to reset upward. During this period, the extrusion effect of the path cam groove 203 on the ball 2016 gradually ends, and the resilience of the first spring 2015 is gradually released, pushing the first piston 205, the ejector rod 204, and the ball 2016 forward. At the same time, the hydraulic fluid inside the second cylinder liner 209 is pumped back into the first cylinder liner 206, causing the second piston 2010 to drive the push rod 2011 to gradually retract into the second cylinder liner 209, and then driving 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 after the retraction amount of the push rod 2011 reaches the maximum, thereafter, as the crankshaft 201 continues to rotate, the cam surface of the path cam groove 203 presses the ball 2016 again. Similarly, the push rod 2011 extends towards the periphery of the second cylinder liner 209, so as not to interfere with the upward reset 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 move upward together. And due to the connection of the push rod 2011 and the second cylinder liner 209, the swing shaft 208 will rotate along the left and right bearing seats 207, causing the left and right eccentric blocks 305 to rotate together. And through the connection of the U-shaped groove 307, the pin 308, the lever 309 and the pick rod 3010 will rotate together until the outer wall of the pick rod 3010 abuts against the lower surface of the bent part at the top of the L-shaped pull arm 304, pushing the L-shaped pull arm 304 upward, and then driving the support plate 303 and the ejector pin 302 to move upward to squeeze the bottom of the mechanical part, facilitating its demolding. At the same time, the upward movement of the support plate 303 stretches the left and right second springs 3011 to store energy. Then, as the eccentric block 305 continues to rotate, finally, the pick rod 3010 disengages from the lower surface of the bent part at the top of the L-shaped pull arm 304, and the resilience of the two second springs 3011 is released, pushing the support plate 303, the ejector pin 302 and the L-shaped pull arm 304 to move downward and reset, so as to retract the ejector pin 302 into the receiving hole 3001 without interfering with the feeding 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 stamping, the riding frame 2012 is driven to move downward. Through the push rod 2011 and the second cylinder liner 209, the swing shaft 208 is driven to rotate reversely along the left and right bearing seats 207, driving the eccentric block 305, the U-shaped groove 307, the pin 308, the lever 309 and the pick rod 3010 to rotate together. Finally, the U-shaped groove 307 rotates to the periphery of the L-shaped pull arm 304. And due to the limiting effect of the end of the bent part at the top of the L-shaped pull arm 304 on the outer wall of the pick rod 3010, the lever 309 and the pin 308 are pushed to rotate along the inside of the U-shaped groove 307, causing the torsion spring between the pin 308 and the U-shaped groove 307 to store energy. Until the U-shaped groove 307 completely rotates from the periphery of the L-shaped pull arm 304 to the bottom of its bent part, the pick rod 3010 also separates from the end of the L-shaped pull arm 304 (as shown in the attached Figure 11 specification). At this time, under the action of the resilience of the torsion spring between the pin 308 and the U-shaped groove 307, the pick rod 3010 drives the lever 309 and the pin 308 to rotate reversely along the inside of the U-shaped groove 307 until the outer wall of the pick rod 3010 contacts the 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, it can ensure the reverse rotation of the swing shaft 208, and at the same time, no unnecessary extrusion is caused to the L-shaped pull arm 304.

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

Claims

1. A press for mechanical manufacturing, characterized in that: Comprising: A stamping bed (100); A stamping unit (200), fixedly arranged on the top of the stamping bed (100) for mechanical stamping; A demolding unit (300), fixedly arranged inside the stamping bed (100) for workpiece demolding, and the stamping unit (200) is also used to drive the demolding unit (300).

2. The press for mechanical manufacturing according to claim 1, wherein: The stamping unit (200) comprises: A crankshaft (201), rotatably mounted on the top of the stamping bed (100) through a bearing; A crank connecting rod (202), articulated to the middle connecting rod journal part of the crankshaft (201) through a bearing bush, and a punch head (2017) is articulated to the bottom of the crank connecting rod (202) through a bearing bush, the punch head (2017) is slidably mounted between it and the stamping bed (100), and a power unit is fixedly arranged on the back of the stamping bed (100); Path cam grooves (203), distributed left and right on the outer surface of the crankshaft (201), and the opening angle of the path cam grooves (203) is adapted to the connecting rod journal angle of the crankshaft (201).

3. The press for mechanical manufacturing according to claim 2, wherein: The stamping unit (200) further comprises: Ejector rods (204), located at the back of the crankshaft (201) and symmetrically distributed left and right about the central axis of the stamping bed (100); Piston I (205), fixedly mounted on the outer wall rear end of the ejector rod (204); Cylinder sleeves I (206), fixedly mounted on the top of the stamping bed (100) in a left and right distribution, and the outer walls of the two pistons I (205) are respectively slidably connected to the inner walls of the two cylinder sleeves I (206); Bearing seats (207), fixedly mounted on the rear end of the top of the stamping bed (100) in a left and right distribution; A swing shaft (208), rotatably mounted between the left and right two bearing seats (207) through a bearing; Cylinder sleeve II (209), fixedly mounted in the middle of the outer wall of the swing shaft (208); Piston II (2010), slidably mounted inside the cylinder sleeve II (209); A push rod (2011), fixedly mounted on the inner wall of the piston II (2010) and passing through the inside of the cylinder sleeve II (209); A riding frame (2012), fixedly mounted at one end of the push rod (2011) away from the piston II (2010), and the riding frame (2012) is articulated to the lower part of the crank connecting rod (202).

4. The press for mechanical manufacturing according to claim 3, wherein: The stamping unit (200) further comprises: An oil pipe (2013), connected to the input end of the cylinder sleeve II (209) through a tee; A valve (2014), fixedly mounted at the output end of the cylinder sleeve I (206), and its output end is fixedly connected to one end of the oil pipe (2013) away from the cylinder sleeve II (209).

5. The press for mechanical manufacturing according to claim 4, wherein: The demolding unit (300) comprises: A placement cavity (301), opened on the front of the stamping bed (100) and extending into its interior; The receiving hole (3001) is opened at the top of the placement cavity (301) and extends to the top of the workbench of the stamping machine body (100). The top column (302) is slidably installed inside the receiving hole (3001). The support plate (303) is fixedly installed at the bottom of the top column (302). The L-shaped pulling arms (304) are fixedly installed at the rear end of the top of the support plate (303) and are distributed left and right. The eccentric blocks (305) are symmetrically distributed left and right about the central axis of the swing shaft (208) and are fixedly installed at both ends of the outer wall of the swing shaft (208), and their positions correspond one by one to the positions of the L-shaped pulling arms (304). The U-shaped groove (307) is opened at the end of the eccentric block (305). The shaft pin (308) is rotatably installed inside the U-shaped groove (307), and a torsion spring is arranged between the shaft pin (308) and the U-shaped groove (307). The lever (309) is fixedly installed in the middle of the outer wall of the shaft pin (308). The pick-up rod (3010) is fixedly installed at one end of the lever (309) away from the shaft pin (308).

6. The press for mechanical manufacturing according to claim 5, wherein: The demoulding unit (300) further includes: The second springs (3011) are symmetrically distributed left and right about the central axis of the placement cavity (301) and are fixedly installed between the bottom of the support plate (303) and the bottom wall of the placement cavity (301).

7. The press for mechanical manufacturing according to claim 6, wherein: The demoulding unit (300) further includes: The linear guide rails (3012) are fixedly installed on the left and right walls of the placement cavity (301). The linear sliders (3013) are slidably installed outside the linear guide rails (3012), and the support plate (303) is fixedly installed between the left and right linear sliders (3013).

8. The press for mechanical manufacturing according to claim 7, wherein: The power unit includes: The power motor (401) is fixedly installed on the back of the stamping machine body (100). The driving belt pulley (402) is fixedly installed on the output shaft of the power motor (401). The driven belt pulley (403) is fixedly installed at one end of the crankshaft (201). The power belt (404) is sleeved outside the driving belt pulley (402) and the driven belt pulley (403). The flywheel (405) is fixedly installed at one end of the crankshaft (201) away from the driven belt pulley (403).

9. The press for mechanical manufacturing according to claim 8, wherein: A first spring (2015) is arranged inside the cylinder sleeve one (206), and the first spring (2015) is fixedly installed between the back of the piston one (205) and the inner side surface of the rear part of the cylinder sleeve one (206). A ball (2016) is movably installed at one end of the ejector 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).

10. The press for mechanical manufacturing according to claim 9, wherein: A guiding bracket (3014) is fixedly installed between the left wall and the right wall of the stamping bed body (100). The L-shaped pulling arm (304) movably penetrates through the inside of the guiding bracket (3014) and is slidably connected to the through hole of the guiding bracket (3014).

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