Crank-link mechanism, reciprocating impact structure, stamping mechanism and shell making device

Abstract

The utility model discloses a crank connecting rod mechanism, a reciprocating impact structure, a stamping mechanism and a shell making device, and belongs to the field of mechanical shell making. According to the bidirectional three-punching shell manufacturing device provided by the embodiment of the utility model, according to the forming process of shell-shaped products such as a battery shell and the like, the one-pulling punching rod, the two-pulling punching rod and the edge pressing mechanism which have relatively short stroke requirements are arranged at one end; the three-pulling-punching-rod mechanism which is long in stroke requirement and does not need edge pressing is arranged at the other end, resultant force of driving of the two ends to the crankshaft is offset, so that equipment is in a state close to complete dynamic balance, vibration of the equipment is greatly reduced, and the forming precision and the production speed of products are effectively improved while an expensive foundation is omitted. And in addition, three-step forming is integrated on one device, so that the device cost and the occupied area of a production line are greatly reduced.

Description

Technical Field

[0001] This utility model specifically relates to a crank-connecting rod mechanism, a reciprocating impact structure, a stamping mechanism, and a shell-making device, belonging to the field of mechanical shell-making technology. Background Technology

[0002] The process of using DWI technology to manufacture slender, cylindrical battery casings is as follows: Figure 1 As shown, the raw material cups are first stretched twice with a diameter reduction (requiring edge pressing) using a stretching machine, and then stretched once with a thinning (not requiring edge pressing) to obtain products with qualified diameter and wall thickness. This method is relatively fast for cylindrical slender shell products (product diameter 26mm~60mm; length 80mm~230mm), with a production speed of about 150 pieces per minute. However, this production method requires a can-making machine for each process, and a production line requires three can-making machines, which is costly. In addition, existing can-making machines are unbalanced devices with large inertial forces in moving parts and significant impact vibrations during operation. Even with a special foundation structure, the vibration of the equipment itself at high speeds (above 150°C) can affect the molding accuracy of battery casing products. For high-precision products like battery casings, it is difficult to further increase the production speed using standard can-making machines. Furthermore, for this process, the first two diameter-changing stretching lengths are relatively short, generally not exceeding half the length of the third thinning stretching product (within 90mm). However, the stroke of standard can-making machines on the market is around 610mm, resulting in significant stroke waste in the first two processes when using standard can-making machines. Utility Model Content

[0003] The main purpose of this utility model is to provide a crank-connecting rod mechanism, a reciprocating impact structure, a stamping mechanism, and a shell-making device, thereby overcoming the shortcomings of the prior art.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0005] The first aspect of this utility model embodiment provides a bidirectional three-stroke crank-connecting rod mechanism, which includes:

[0006] The crankshaft, as well as the first connecting rod, the second connecting rod, and the third connecting rod;

[0007] The crankshaft has a first crank, a third crank, and a second crank arranged sequentially along its own axial direction. The first crank and the second crank have the same turning direction, while the first crank has the opposite turning direction to the third crank.

[0008] A second aspect of this utility model provides a structure for converting rotary motion into reciprocating impact motion, comprising:

[0009] The bidirectional three-stroke crank-connecting rod mechanism;

[0010] And, the first slider, the second slider, the third slider, the first guide rail, the second guide rail, and the third guide rail;

[0011] The crankshaft's axial direction is parallel to the x-axis of a three-dimensional coordinate system. The first guide rail, the second guide rail, and the third guide rail all extend along the y-axis of the three-dimensional coordinate system. In the y-axis direction, the first guide rail and the second guide rail are located on the same side of the crankshaft, and the third guide rail is located on the other side of the crankshaft. The first slider is slidably engaged with the first guide rail and rotatably connected to the first connecting rod. The second slider is slidably engaged with the second guide rail and rotatably connected to the second connecting rod. The third slider is slidably engaged with the third guide rail and rotatably connected to the third connecting rod. When the crankshaft rotates around its own axis, the first slider, the second slider, and the third slider reciprocate along the first guide rail, the second guide rail, and the third guide rail, respectively.

[0012] A third aspect of this utility model embodiment provides a bidirectional three-stroke stamping mechanism, which includes:

[0013] The structure that converts rotational motion into reciprocating impact motion;

[0014] And, the first striker, the second striker, and the third striker;

[0015] In the y-axis direction, the first punch and the second punch are arranged on the same side of the crankshaft along the three-dimensional coordinate system, and the third punch is arranged on the other side of the crankshaft. The first punch is fixedly connected to the first slider, the second punch is fixedly connected to the second slider, and the third punch is fixedly connected to the third slider.

[0016] A fourth aspect of this utility model provides a bidirectional three-punch shell-making apparatus, comprising:

[0017] The bidirectional three-punch stamping mechanism includes a first mold, a second mold, and a third mold. The first mold cooperates with the first punch and is used to process the raw material cup into a first pull-out shell. The second mold cooperates with the second punch and is used to process the first pull-out shell into a second pull-out shell. The third mold cooperates with the third punch and is used to process the second pull-out shell into a third pull-out shell.

[0018] Compared with the prior art, the advantages of this utility model include:

[0019] 1) The present invention provides a bidirectional three-punch shell forming device that integrates three forming processes into one machine, effectively reducing equipment costs and production line floor space.

[0020] 2) The bidirectional three-stroke shell-making device provided in this utility model embodiment has the following characteristics: at any time, the dynamic resultant force of the first connecting rod and the second connecting rod on the crankshaft is opposite in direction, the point of action is completely coincident, and the magnitude is almost equal. Therefore, the equipment is in a state of near-perfect balance, effectively reducing the vibration of the equipment, increasing the production speed (up to 300 cans per minute or more), and improving the product accuracy.

[0021] 3) The bidirectional three-stroke shell-making device provided in this embodiment of the utility model is in near-complete dynamic equilibrium with low vibration and no need for special foundation treatment, which makes production line construction and relocation easier.

[0022] 4) The bidirectional three-stroke shell-making device provided in this utility model integrates three stretching processes into one machine, ensuring that the production cycle of the three stretching processes is completely consistent. This eliminates the need for complex storage / replenishment tank equipment and corresponding conveying equipment between machines. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the main drive and foundation of an existing standard can-making machine;

[0025] Figure 2 This is a process diagram for producing battery casings using a can-making machine;

[0026] Figure 3 This is a schematic diagram of the overall structure of a bidirectional three-punch shell-making device provided in a typical embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the bidirectional three-stroke stamping mechanism in a bidirectional three-stroke shell-making device provided in a typical embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the crankshaft structure in a bidirectional three-stroke shell-making device provided in a typical embodiment of this utility model;

[0029] Figure 6 This is a force diagram of the crankshaft in a bidirectional three-stroke shell-making device provided in a typical embodiment of this utility model;

[0030] Figure 7This is a schematic diagram of the edge pressing mechanism in a bidirectional three-punch shell making device provided in a typical embodiment of this utility model;

[0031] Figure 8 This is a partial structural diagram of the pressing mechanism in a bidirectional three-punch shell-making device provided in a typical embodiment of this utility model. Detailed Implementation

[0032] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0033] The first aspect of this utility model embodiment provides a bidirectional three-stroke crank-connecting rod mechanism, which includes:

[0034] The crankshaft, as well as the first connecting rod, the second connecting rod, and the third connecting rod;

[0035] The crankshaft has a first crank, a third crank, and a second crank arranged sequentially along its own axial direction. The first crank and the second crank have the same turning direction, while the third crank has the opposite turning direction.

[0036] Furthermore, the first connecting rod is rotatably connected to the first crank, the second connecting rod is rotatably connected to the second crank, and the third connecting rod is rotatably connected to the third crank. At any time and in any posture, the dynamic resultant force F4 of the force F1 exerted by the first connecting rod on the crankshaft and the force F2 exerted by the second connecting rod on the crankshaft is approximately equal in magnitude, opposite in direction, and coincides in point of application with the force F3 exerted by the third connecting rod on the crankshaft.

[0037] Furthermore, along the axial direction of the crankshaft, the axial distance between the third crank and the first and second cranks is equal.

[0038] Furthermore, the first crank and the second crank are symmetrically distributed on both sides of the third crank.

[0039] Furthermore, the first crank, the third crank, and the second crank form a mirror-symmetric structure.

[0040] Furthermore, the first crank has a first crank radius, the second crank has a second crank radius, and the third crank has a third crank radius, wherein the first crank radius = the second crank radius < the third crank radius.

[0041] Furthermore, the radius of the third bend is 2-3 times the radius of the first bend / the radius of the second bend.

[0042] A second aspect of this utility model provides a structure for converting rotary motion into reciprocating impact motion, comprising:

[0043] The bidirectional three-stroke crank-connecting rod mechanism;

[0044] And, the first slider, the second slider, the third slider, the first guide rail, the second guide rail, and the third guide rail;

[0045] The crankshaft's axial direction is parallel to the x-axis of a three-dimensional coordinate system. The first guide rail, the second guide rail, and the third guide rail all extend along the y-axis of the three-dimensional coordinate system. In the y-axis direction, the first guide rail and the second guide rail are located on the same side of the crankshaft, and the third guide rail is located on the other side of the crankshaft. The first slider is slidably engaged with the first guide rail and rotatably connected to the first connecting rod. The second slider is slidably engaged with the second guide rail and rotatably connected to the second connecting rod. The third slider is slidably engaged with the third guide rail and rotatably connected to the third connecting rod. When the crankshaft rotates around its own axis, the first slider, the second slider, and the third slider reciprocate along the first guide rail, the second guide rail, and the third guide rail, respectively.

[0046] A third aspect of this utility model embodiment provides a bidirectional three-stroke stamping mechanism, which includes:

[0047] The structure that converts rotational motion into reciprocating impact motion;

[0048] And, the first striker, the second striker, and the third striker;

[0049] In the y-axis direction, the first punch and the second punch are arranged on the same side of the crankshaft along the three-dimensional coordinate system, and the third punch is arranged on the other side of the crankshaft. The first punch is fixedly connected to the first slider, the second punch is fixedly connected to the second slider, and the third punch is fixedly connected to the third slider.

[0050] Furthermore, the length directions of the first punch, the second punch, and the third punch are parallel to the y-axis direction.

[0051] Furthermore, the length of the first punch is equal to the length of the second punch and less than the length of the third punch.

[0052] A fourth aspect of this utility model provides a bidirectional three-punch shell-making apparatus, comprising:

[0053] The bidirectional three-punch stamping mechanism includes a first mold, a second mold, and a third mold. The first mold cooperates with the first punch and is used to process the raw material cup into a first pull-out shell. The second mold cooperates with the second punch and is used to process the first pull-out shell into a second pull-out shell. The third mold cooperates with the third punch and is used to process the second pull-out shell into a third pull-out shell.

[0054] In a more specific implementation, the bidirectional three-punch shell-making device further includes: two sets of edge-pressing mechanisms, which are respectively used to fix the raw material cup before processing it into a first pull-out shell and to fix the first pull-out shell before processing it into a second pull-out shell.

[0055] Furthermore, the pressing mechanism includes a pressing cam, a cam follower, a pressing push rod, an air chamber, a pressing airbag, a pressing swing arm, a reset airbag, and a pressing cup sleeve;

[0056] The pressing cam is fixed on the crankshaft, the cam follower is driven by the pressing cam, the pressing push rod is hinged to the cam follower, the air chamber is fixedly engaged with the pressing push rod, the pressing air chamber is arranged along the axial direction of the pressing push rod between the pressing cup sleeve and the air chamber and is fixedly connected to the pressing cup sleeve and the air chamber respectively, the pressing swing arm is connected to the pressing push rod and the reset air chamber respectively, the pressing swing arm is rotatably engaged with the bed of the bidirectional three-stroke shell making device, and the pressing swing arm can rotate around the x-axis;

[0057] When the crankshaft is driven to rotate, the pressing push rod and the pressing cup sleeve as a whole can be driven to reciprocate along their own axial direction, and the pressing cup sleeve can also move relative to the pressing push rod along its own axial direction; wherein, the driving force for the pressing push rod and the pressing cup sleeve as a whole to move along their own axial direction comes from the power driving the rotation of the crankshaft and the contact pressure between the reset airbag and the pressing arm, and the driving force for the pressing cup sleeve to move relative to the pressing push rod along its own axial direction comes from the contact pressure between the pressing airbag and the pressing cup sleeve.

[0058] Furthermore, the pressing mechanism also includes a guide sleeve, which slides with the airbag chamber, and the pressing cup sleeve is fixedly fitted with the guide sleeve.

[0059] Furthermore, the pressure cam is disposed on the outer side of the first crank and the second crank, away from the third crank.

[0060] Furthermore, the two sets of pressing mechanisms are distributed in a mirror-symmetric manner.

[0061] Furthermore, the axial direction of the pressure push rod is parallel to the y-axis direction.

[0062] In a more specific implementation, the bidirectional three-stroke shell-making device further includes a drive mechanism, which is connected to the crankshaft drive.

[0063] In a more specific embodiment, the bidirectional three-punch shell-making device further includes: a first cup-dropping mechanism, a second cup-dropping mechanism, and a third cup-dropping mechanism. The first cup-dropping mechanism is disposed on one side of the first mold along the extension direction of the first punch and is used to detach the first pull-out shell from the first punch. The second cup-dropping mechanism is disposed on one side of the second mold along the extension direction of the second punch and is used to detach the second pull-out shell from the second punch. The third cup-dropping mechanism is disposed on one side of the third mold along the extension direction of the third punch and is used to detach the third pull-out shell from the third punch.

[0064] In a more specific implementation, the bidirectional three-punch shell forming device further includes a shell bottom forming mechanism, which is disposed on the other side of the third mold along the extension direction of the third punch and is used to cooperate with the third punch to process the bottom of the third pulled-out shell into the required shell bottom structure.

[0065] The following will further explain the technical solution, its implementation process and principle in conjunction with the accompanying drawings and specific implementation examples. Unless otherwise specified, the drive motor, bearing, bearing housing, mold, punch, cam, cam follower, guide rail, brake clutch assembly and other components involved in the embodiments of this utility model can all be known in the art, and can all be obtained by commercial purchase or conventional processes known in the art.

[0066] This utility model provides a bidirectional three-punch high-speed shell-making device, which performs three punching and stretching processes and two edge pressing processes on a raw material cup to obtain a shell-shaped product with qualified diameter and wall thickness.

[0067] In a typical implementation case, please refer to Figure 3 A bidirectional three-stroke high-speed shell-making device includes a bed 114 and a drive mechanism 101, a bidirectional three-stroke stamping mechanism, a first mold 111, a second mold 112, and a third mold 113 mounted on the bed 114. The first mold 111 and the second mold 112 are arranged along the y-axis of a three-dimensional coordinate system on one side of the bidirectional three-stroke stamping mechanism in the +y-axis direction. The third mold 113 is arranged along the y-axis of the three-dimensional coordinate system on one side of the bidirectional three-stroke stamping mechanism in the -y-axis direction. The drive mechanism 101 is in transmission cooperation with the bidirectional three-stroke stamping mechanism and drives the bidirectional three-stroke stamping mechanism to cooperate with the first mold 111, the second mold 112, and the third mold 113 to complete the three-stage stamping and stretching process of the raw material cup. For details, please refer to the attached document. Figure 1 and Figure 3The bidirectional three-stroke stamping mechanism cooperates with the first mold 111 to stamp and stretch the raw material cup 401 to form the first pull-out shell 402. The bidirectional three-stroke stamping mechanism cooperates with the second mold 112 to stamp and stretch the first pull-out shell 402 to form the second pull-out shell 403. The bidirectional three-stroke stamping mechanism cooperates with the third mold 113 to stamp and stretch the second pull-out shell 403 to form the third pull-out shell 404.

[0068] Specifically, the bidirectional three-stroke stamping mechanism is the core module of the bidirectional three-stroke high-speed shell-making device. The structure of the bidirectional three-stroke stamping mechanism will be explained in detail below.

[0069] Please refer to the following: Figure 3 , Figure 4 and Figure 5 The bidirectional three-stroke stamping mechanism includes a crankshaft 104, a first connecting rod 115, a second connecting rod 118, a third connecting rod 123, a first slider 117, a second slider 120, a third slider 124, a first guide rail 106, a second guide rail 107, a third guide rail 105, a first punch 116, a second punch 119, and a third punch 125.

[0070] The central axis of the crankshaft 104 is parallel to the x-axis of the three-dimensional coordinate system. The first slider 117, the second slider 120, the first guide rail 106, the second guide rail 107, the first punch 116, and the second punch 119 are located on one side of the crankshaft 104 in the +y-axis direction, and the third slider 124, the third guide rail 105, and the third punch 125 are located on one side of the crankshaft 104 in the -y-axis direction.

[0071] The crankshaft 104 has a first crank 1041, a third crank 1043, and a second crank 1042 arranged sequentially along its own axial direction (i.e., the x-axis direction). Along the axial direction of the crankshaft 104, the third crank 1043 is equidistant from the first crank 1041 and the second crank 1042. The first crank 1041 and the second crank 1042 have the same turning direction, while the third crank 1043 has the opposite turning direction. The two ends of the first connecting rod 115 are rotatably connected to the first crank 1041 and the first slider 117, respectively. One end of the first punch 116 is fixedly connected to the first slider 117. The second connecting rod 11... The two ends of the second crank 1042 and the second slider 120 are respectively rotatably connected. One end of the second punch 119 is fixedly connected to the second slider 120. The two ends of the third connecting rod 123 are respectively rotatably connected to the third crank 1043 and the third slider 124. One end of the third punch 125 is fixedly connected to the third slider 124. The first guide rail 106, the second guide rail 107, and the third guide rail 105 are fixed on the bed 114. The first slider 117, the second slider 120, and the third slider 124 are respectively slidably engaged with the first guide rail 106, the second guide rail 107, and the third guide rail 105.

[0072] The crankshaft 104 is connected to the drive mechanism 101 and can rotate around its own central axis under the drive of the drive mechanism 101. When the crankshaft 104 rotates around its own central axis, the first connecting rod 115, the second connecting rod 118, the third connecting rod 123, the first slider 117, the second slider 120, the third slider 124, the first guide rail 106, the second guide rail 107, and the third guide rail 105 convert the rotational motion of the crankshaft 104 into the linear motion of the first punch 116, the second punch 119, and the third punch 125 along the y-axis. The first punch 116, the second punch 119, and the third punch 125 cooperate with the first mold 111, the second mold 112, and the third mold 113 respectively to stamp and stretch to obtain the first pull-out shell 402, the second pull-out shell 403, and the third pull-out shell 404.

[0073] Understandably, the linear motion of the first punch 116, the second punch 119, and the third punch 125 along the y-axis is defined and guided by the first sliding guide structure formed by the cooperation of the first slider 117 and the first guide rail 106, the second sliding guide structure formed by the cooperation of the second slider 120 and the second guide rail 107, and the third sliding guide structure formed by the cooperation of the third slider 124 and the third guide rail 105. It should be noted that the dimensions and mass of the first slider 117, the second slider 120, and the third slider 124 are identical.

[0074] Specifically, at any moment and in any posture, the dynamic resultant force F4 of the force (mainly inertial force) F1 exerted by the first connecting rod 115 on the crankshaft 104 and the force (mainly inertial force) F2 exerted by the second connecting rod 118 on the crankshaft 104 and the force (mainly inertial force) F3 exerted by the third connecting rod 123 on the crankshaft 104 and the force (mainly inertial force) F3 exerted by the third connecting rod 123 on the crankshaft 104 is approximately equal in magnitude, opposite in direction, and coincides in point of application. Therefore, the bidirectional three-stroke stamping mechanism / bidirectional three-stroke high-speed shell-making device is close to a completely balanced state, effectively reducing equipment vibration, improving the stress condition of the crankshaft, increasing production speed (up to 300 cans per minute or more), and improving the processing accuracy of shell-shaped products.

[0075] It should be noted that in the bidirectional three-stroke stamping mechanism, the total force F1 exerted by the first connecting rod 115 on the crankshaft 104, the total force F2 exerted by the second connecting rod 118 on the crankshaft 104, and the total force F3 exerted by the third connecting rod 123 on the crankshaft 104 refer to the resultant force of the inertial force of the moving parts of the bidirectional three-stroke stamping mechanism and the internal force of the equipment. Specifically, force F1 is the resultant force of the inertial force and the internal force of the first stretching motion component composed of the first connecting rod, the first crank, the first slider, and the first punch; force F2 is the resultant force of the inertial force and the internal force of the second stretching motion component composed of the second connecting rod, the second crank, the second slider, and the second punch; and force F3 is the resultant force of the inertial force and the internal force of the third stretching motion component composed of the third connecting rod, the third crank, the third slider, and the third punch. For the bidirectional three-stroke stamping mechanism / bidirectional three-stroke high-speed shell making device, the smaller the resultant force of the inertial force, the smaller the equipment vibration. In this invention, the statement that F3 and F4 are approximately equal in size means that the difference between them does not exceed 15% of F3 or F4.

[0076] Please refer to the following for details. Figure 4 , Figure 5 , Figure 6 The first crank 1041 and the second crank 1042 are mirror-symmetrically distributed on both sides of the third crank 1043. Specifically, the first crank 1041, the third crank 1043, and the second crank 1042 form a mirror-symmetrical structure. It can be understood that the structure and structural parameters of the first crank 1041 and the second crank 1042 are completely identical. In the x-axis direction, the center distance between the third crank 1043 and the first crank 1041 and the second crank 1042 is the same. Specifically, the first crank 1041 has a first crank radius, the second crank 1042 has a second crank radius, and the third crank 1043 has a third crank radius, where the first crank radius = the second crank radius < the third crank radius. Preferably, the third crank radius is 2-3 times the ratio of the first crank radius to the second crank radius.

[0077] More specifically, the structure formed by the first crank 1041, the second crank 1042, the third crank 1043, the first connecting rod 115, the second connecting rod 118, and the third connecting rod 123 is a mirror-symmetric structure. The axis of mirror symmetry of the component / structure formed by the first crank 1041, the third crank 1043, and the second crank 1042, as well as the component / structure formed by the first crank 1041, the second crank 1042, the third crank 1043, the first connecting rod 115, the second connecting rod 118, and the third connecting rod 123, is the central axis of the third connecting rod 123, which is parallel to the y-axis. The structure and structural parameters of the first connecting rod 115 and the second connecting rod 118 are completely identical. In the x-axis direction, the center distance between the third connecting rod 123 and the first connecting rod 115 and the second connecting rod 118 is the same.

[0078] Specifically, the length directions of the first guide rail 106, the second guide rail 107, the third guide rail 105, the first punch 116, the second punch 119, and the third punch 125 are all parallel to the y-axis. Specifically, the first connecting rod 115 and the second connecting rod 118 have the same structure and dimensions, while the third connecting rod 123 has a longer length than the first connecting rod 115 and the second connecting rod 118, i.e., the length of the first connecting rod 115 = the length of the second connecting rod 118 < the length of the third connecting rod 123. Preferably, the length of the third connecting rod (123) is 2-3 times the length of the first connecting rod (115) / the second connecting rod (118). Specifically, the first slider 117 and the second slider 120 have the same structure and dimensions, while the structure of the third slider 124 is the same as or similar to that of the first slider 117 and the second slider 120, but its dimensions are larger, i.e., the dimensions of the first slider 117 are the same as those of the second slider 120 but smaller than those of the third slider 124. Specifically, the length of the first guide rail 106 = the length of the second guide rail 107 < the length of the third guide rail 105. Specifically, the length of the first punch 116 = the length of the second punch 119 < the length of the third punch 125. The radial dimensions of the first punch 116, the second punch 119, and the third punch 125, as well as the dimensions of the punches, are set according to specific requirements. Generally, the diameter of the punch in the first punch 116 is greater than the diameter of the punch in the second punch 119, which is greater than the diameter of the punch in the third punch 125.

[0079] Specifically, the differences in the crank radii of the first crank 1041, the second crank 1042, and the third crank 1043 in this utility model mainly stem from the requirements of the product manufacturing process, such as... Figure 2As shown, the axial height of the third pull-out shell 404 is approximately 2 to 3 times that of the first pull-out shell 402 and the second pull-out shell 403, which is a characteristic of tensile deformation. The smaller axial height of the first pull-out shell 402 and the second pull-out shell 403 requires a smaller stroke; therefore, the crank radii of the first and second cranks are correspondingly smaller. This requirement results in the inertial force generated by the first and second stretching motion components being approximately half that generated by the third stretching motion component. Therefore, the overall inertial force is essentially close to zero. In particular, the inertial force... The torques are completely balanced (torque balance means that when an object rotates around a fixed point (or axis) under the action of multiple forces, the sum of the clockwise torques generated by these forces is equal to the sum of the counterclockwise torques, thus putting the object in a state of rotational equilibrium, i.e., the object remains stationary or rotates at a uniform speed). In this utility model, the points of action of F3 and F4 coincide, and no torque is generated during the entire operation of the bidirectional three-stroke stamping mechanism / bidirectional three-stroke high-speed shell-making device. That is, the equipment is not only force-balanced, but also torque-balanced, which makes the overall vibration of the equipment smaller. Specifically, in order to ensure the structural stability of the crankshaft 104 when rotating, two crankshaft bearing seats 103 are also fixedly installed on the bed 114. The two ends of the crankshaft 104 are rotatably connected to the two crankshaft bearing seats 103 through a bearing. As a typical implementation, the bearing and the crankshaft bearing seats 103 can be coaxially fixedly sleeved on the crankshaft 104.

[0080] Specifically, the drive mechanism 101 can be connected to the crankshaft 104 via the brake clutch assembly 102. The drive mechanism 101 can be a rotary drive mechanism such as a motor. The structure of the brake clutch assembly 102 itself and the cooperation structure / method between the brake clutch assembly 102 and the drive mechanism 101 and the crankshaft 104 can also be known in the art, and no specific limitation is made here.

[0081] It should be noted that the method and specific structure of the first guide rail 106, the second guide rail 107, the third guide rail 105, and the crankshaft bearing seat 103 fixedly assembled on the bed 114 can adopt methods and structures known in the art, and are not limited here. The specific structure and material of the first connecting rod 115, the second connecting rod 118, the third connecting rod 123, the first slider 117, the second slider 120, the third slider 124, the first guide rail 106, the second guide rail 107, and the third guide rail 105 can also adopt structures known in the art, and are not specifically limited here. The first punch 116, the second punch 119, and the third punch 125 correspond and match with the first mold 111, the second mold 112, and the third mold 113, respectively. The punch structure of the first punch 116, the second punch 119, and the third punch 125, as well as the structure of the first mold 111, the second mold 112, and the third mold 113, are set according to the structure of the shell-shaped product to be finally processed, and are not specifically limited here.

[0082] Please refer again to a more detailed implementation plan. Figure 3 The bidirectional three-punch shell-making device also includes a first cup-lowering mechanism 108, a second cup-lowering mechanism 109, and a third cup-lowering mechanism 110. The first cup-lowering mechanism 108 is located on one side of the -y-axis direction of the first mold 111 along the extension direction of the first punch 116, and is used to disengage the first pull-out shell 402 from the first punch 116. The second cup-lowering mechanism 109 is located on one side of the -y-axis direction of the second mold 112 along the extension direction of the second punch 119, and is used to disengage the second pull-out shell 403 from the second punch 119. The third cup-lowering mechanism 110 is located on one side of the +y-axis direction of the third mold 113 along the extension direction of the third punch 125, and is used to disengage the third pull-out shell 404 from the third punch 125. It should be noted that the first cup-lowering mechanism 108, the second cup-lowering mechanism 109, and the third cup-lowering mechanism 110 can be functional mechanisms that cooperate with the punch to achieve product demolding formed by stamping and stretching. They can adopt structures known in the art, and their specific structures are not limited or described here.

[0083] Please refer again to a more detailed implementation plan. Figure 3 The bidirectional three-punch shell-making apparatus also includes a shell bottom forming mechanism 130. The shell bottom forming mechanism 130 is disposed on one side of the third mold 113 along the extension direction of the third punch 125 in the y-axis direction, and is used to cooperate with the third punch 125 to process the bottom of the third pulled-out shell 404 into the required shell bottom structure. It should be noted that the specific structure of the shell bottom forming mechanism 130 is set according to the required structure of the final shell-shaped product, and it can adopt functional mechanisms known in the art; its specific structure is not limited or described here.

[0084] For a more specific implementation plan, please refer to Figure 3 The bidirectional three-punch shell forming device also includes two sets of edge pressing mechanisms 200. The two sets of edge pressing mechanisms 200 are used to press and fix the raw material cup 401 (specifically, press the edge of the raw material cup) 401 before processing the raw material cup 401 into the first pull-out shell 402, and to press and fix the first pull-out shell 402 (specifically, press the edge of the first pull-out shell) 402 before processing the first pull-out shell 402 into the second pull-out shell 403, so as to assist in realizing the stamping and stretching processing of the first pull-out shell 402 and the second pull-out shell 403.

[0085] Please refer to the following: Figure 3 , Figure 7 and Figure 8 Each pressing mechanism includes a pressing cam 121, a cam follower 201, a pressing push rod 203, an air chamber 205, a pressing air bladder 206, a pressing swing arm 209, a reset air bladder 210, and a pressing cup sleeve.

[0086] The pressing cam 121 is fixed on the crankshaft 104. The cam follower 201 is driven by the pressing cam 121. The pressing push rod 203 is hinged to the cam follower 201. The air chamber 205 is fixedly engaged with the pressing push rod 203. The pressing air chamber 206 is arranged between the pressing cup sleeve and the air chamber 205 along the axial direction of the pressing push rod 203 and is fixedly connected to the pressing cup sleeve and the air chamber 205 respectively. One end of the pressing swing arm 209 is connected to the pressing push rod 203 and rotates with the pressing push rod 203 through the follower bearing 204. The other end is fixedly connected to the reset air chamber 210. The middle part of the pressing swing arm 209 rotates with the bed 114 through the pin 211. The pressing swing arm 209 can rotate around the x-axis.

[0087] When the crankshaft 104 is driven to rotate, the pressure push rod 203 and the pressure cup sleeve as a whole can be driven to reciprocate along their own axis, and the pressure cup sleeve can also move relative to the pressure push rod 203 along its own axis; wherein, the driving force for the pressure push rod 203 and the pressure cup sleeve as a whole to move along their own axis comes from the power driving the rotation of the crankshaft 104 and the contact pressure between the reset airbag 210 and the pressure arm 209, and the driving force for the pressure cup sleeve to move relative to the pressure push rod 203 along its own axis comes from the contact pressure between the pressure airbag 206 and the pressure cup sleeve.

[0088] Specifically, the two sets of pressing mechanisms are mirror-symmetrically distributed on both sides of the bidirectional three-stroke stamping mechanism along the x-axis. It can be understood that the overall structural composition and configuration parameters of the two pressing mechanisms are the same, and their specific configuration parameters can be set according to specific needs, without specific limitations here. The main difference between the two is the size of the pressing sleeve. The two pressing sleeves of the two pressing mechanisms can be defined as the first pressing sleeve 207 and the second pressing sleeve 208, respectively. It can be understood that, in the x-axis direction, the two pressing cams 121 are symmetrically distributed on both sides of the third crank 1043. Specifically, the two pressing cams 121 are respectively set between the first crank 1041, the second crank 1042, and the two crankshaft bearing seats 103.

[0089] Please refer to the following for details. Figure 7 and Figure 8 The pressing mechanism also includes a guide sleeve 212, which slides along its own axis with the air chamber 205, and the pressing cup sleeve is fixedly fitted with the guide sleeve 212. Specifically, the pressing air chamber 206 and the reset air chamber 210 can also be connected to an air supply mechanism, etc. The air supply mechanism adjusts the gas pressure inside the pressing air chamber 206 and the reset air chamber 210 by introducing compressed air into the pressing air chamber 206, and the force on both sides of the pressing air chamber can be adjusted by adjusting the air pressure value. More specifically, the air chambers of the two pressing mechanisms can be fixed as a whole.

[0090] Specifically, in order to ensure the coaxiality of the two sets of pressure cup sleeves with the raw material cup 401 and the first pull-out shell 402, the pressing mechanism also includes multiple pressing bearing seats 202 and multiple linear bearings. The multiple pressing bearing seats 202 are fixed to the bed 114 at intervals along the y-axis direction. Each linear bearing is fixed on a pressing bearing seat 202, and the pressing push rod 203 passes through the multiple linear bearings coaxially.

[0091] In a more specific embodiment, the bidirectional three-stroke shell-making apparatus further includes a conveyor line that runs between the first cup-feeding mechanism 108, the second cup-feeding mechanism 109, and the third cup-feeding mechanism 110, and is used to transport raw material cups and intermediate products such as shell-shaped products. This conveyor line can employ structures known in the art and is not limited thereto.

[0092] It should be noted that this bidirectional three-stroke shell-making device may also include other functional modules such as controllers and other modules used for product quality inspection, without specific limitations here.

[0093] The production process of a shell-shaped product may include: a raw material cup 401 enters the entrance of the first mold 111 via the first cup-dropping mechanism 108, driving the crankshaft 104 to rotate via the drive mechanism 101; the first pressure sleeve 207 moves towards the +y axis and presses the raw material cup 401; the crankshaft 104 continues to rotate, driving the first punch 116 to move towards the +y axis and driving the raw material cup 401 through the first mold 111 to form the first pull-out shell 402; the first pressure sleeve 207 resets towards the -y axis; the first pull-out shell 402 moves towards the -y axis after passing the bottom dead center to complete demolding; the first pull-out shell 402 enters the second cup-dropping mechanism 1 via the conveyor line. 09. The crankshaft 104 rotates again, the second pressing sleeve 208 moves in the +y axis direction and presses the first pull-out shell 402. The crankshaft 104 continues to rotate and drives the second punch 119 to move in the +y axis direction and drive the first pull-out shell 402 through the second mold 112 to form the second pull-out shell 403. After passing through the second mold 119, it becomes the second pull-out shell 403. Similarly, the second pull-out shell 403 moves along the -y axis direction through the third punch 125 and is processed by the third mold 113 to become the third pull-out shell 404. It also works with the shell bottom forming mechanism 130 to complete the processing of the shell-shaped product. The shell-shaped product can be a battery shell or a metal shell such as an aluminum can.

[0094] This utility model provides a bidirectional three-stroke shell forming device. According to the forming process of shell-shaped products such as battery cases, the short-stroke first and second-stroke punches and the pressing mechanism are arranged at one end; the long-stroke third-stroke punch mechanism that does not require pressing is arranged at the other end. The resultant forces of the two ends driving the crankshaft cancel each other out, so that the equipment reaches a state of near-perfect dynamic balance, which greatly reduces the vibration of the equipment. While saving the expensive foundation, it also effectively improves the forming accuracy and production speed of the product. In addition, integrating the three forming processes into one machine also greatly reduces the equipment cost and the production line floor space.

[0095] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A bidirectional three-stroke crank-connecting rod mechanism, characterized in that, include: Crankshaft (104) and first connecting rod (115), second connecting rod (118) and third connecting rod (123); The crankshaft (104) has a first crank (1041), a third crank (1043), and a second crank (1042) arranged sequentially along its own axis. The first crank (1041) and the second crank (1042) have the same turning direction, while the turning direction of the third crank is opposite.

2. The bidirectional three-stroke crank-connecting rod mechanism according to claim 1, characterized in that: The first connecting rod (115) is rotatably connected to the first crank (1041), the second connecting rod (118) is rotatably connected to the second crank (1042), and the third connecting rod (123) is rotatably connected to the third crank (1043). At any time and in any posture, the dynamic resultant force F4 of the force F1 exerted by the first connecting rod (115) on the crankshaft (104) and the force F2 exerted by the second connecting rod (118) on the crankshaft (104) and the force F3 exerted by the third connecting rod (123) on the crankshaft (104) are approximately equal in magnitude, opposite in direction, and coincide in point of action.

3. The bidirectional three-stroke crank-connecting rod mechanism according to claim 1, characterized in that: In the axial direction of the crankshaft (104), the third crank (1043) is equidistant from the first crank (1041) and the second crank (1042).

4. The bidirectional three-stroke crank-connecting rod mechanism according to claim 3, characterized in that: The first crank (1041) and the second crank (1042) are symmetrically distributed on both sides of the third crank (1043).

5. The bidirectional three-stroke crank-connecting rod mechanism according to claim 4, characterized in that: The first crank (1041), the third crank (1043), and the second crank (1042) are a mirror-symmetric structure.

6. The bidirectional three-stroke crank-connecting rod mechanism according to claim 1 or 2, characterized in that: The first crank (1041) has a first crank radius, the second crank (1042) has a second crank radius, and the third crank (1043) has a third crank radius, wherein the first crank radius = the second crank radius < the third crank radius.

7. The bidirectional three-stroke crank-connecting rod mechanism according to claim 6, characterized in that: The radius of the third bend is 2-3 times the radius of the first bend / the radius of the second bend.

8. A reciprocating impact structure for converting rotational motion into reciprocating impact motion, characterized in that, include: The bidirectional three-stroke crank-connecting rod mechanism according to any one of claims 1-7; And, the first slider (117), the second slider (120), the third slider (124), the first guide rail (106), the second guide rail (107), and the third guide rail (105); The crankshaft (104) has its axial direction parallel to the x-axis of a three-dimensional coordinate system. The first guide rail (106), the second guide rail (107), and the third guide rail (105) all extend along the y-axis of the three-dimensional coordinate system. In the y-axis direction, the first guide rail (106) and the second guide rail (107) are located on the same side of the crankshaft (104), and the third guide rail (105) is located on the other side of the crankshaft (104). The first slider (117) is slidably engaged with the first guide rail (106), and the first slider (117) is rotatably connected to the first connecting rod (115). The second slider (120) is slidably engaged with the second guide rail (107), the second slider (120) is rotatably connected with the second connecting rod (118), the third slider (124) is slidably engaged with the third guide rail (105), and the third slider (124) is rotatably connected with the third connecting rod (123); when the crankshaft (104) rotates around its own axis, the first slider (117), the second slider (120), and the third slider (124) reciprocate along the first guide rail (106), the second guide rail (107), and the third guide rail (105), respectively.

9. A bidirectional three-stroke stamping mechanism, characterized in that, include: The reciprocating impact structure for converting rotational motion into reciprocating impact motion as described in claim 8; And, the first striker (116), the second striker (119), and the third striker (125). In the y-axis direction, the first punch (116) and the second punch (119) are arranged on the same side of the crankshaft (104) along the three-dimensional coordinate system, and the third punch (125) is arranged on the other side of the crankshaft (104). The first punch (116) is fixedly connected to the first slider (117), the second punch (119) is fixedly connected to the second slider (120), and the third punch (125) is fixedly connected to the third slider (124).

10. The bidirectional three-stroke stamping mechanism according to claim 9, characterized in that: The length directions of the first punch (116), the second punch (119), and the third punch (125) are parallel to the y-axis direction.

11. The bidirectional three-stroke stamping mechanism according to claim 10, characterized in that: The length of the first punch (116) = the length of the second punch (119) < the length of the third punch (125).

12. A bidirectional three-stroke shell-making device, characterized in that, include: The bidirectional three-punch stamping mechanism according to claim 9, 10 or 11, and a first mold (111), a second mold (112) and a third mold (113), wherein the first mold (111) cooperates with the first punch (116) and is used to process the raw material cup (401) into a first pull-out shell (402), the second mold (112) cooperates with the second punch (119) and is used to process the first pull-out shell (402) into a second pull-out shell (403), and the third mold (113) cooperates with the third punch (125) and is used to process the second pull-out shell (403) into a third pull-out shell (404).

13. The bidirectional three-punch shell-making apparatus according to claim 12, characterized in that, Also includes: Two sets of edge pressing mechanisms are used to fix the raw material cup (401) before processing it into the first pull-out shell (402) and to fix the first pull-out shell (402) before processing it into the second pull-out shell (403).

14. The bidirectional three-punch shell-making apparatus according to claim 13, characterized in that: The pressing mechanism includes a pressing cam (121), a cam follower (201), a pressing push rod (203), an air chamber (205), a pressing airbag (206), a pressing swing arm (209), a reset airbag (210), and a pressing cup sleeve; The pressing cam (121) is fixed on the crankshaft (104), the cam follower (201) is driven by the pressing cam (121), the pressing push rod (203) is hinged to the cam follower (201), the air chamber (205) is fixedly engaged with the pressing push rod (203), the pressing air chamber (206) is arranged along the axial direction of the pressing push rod (203) between the pressing cup sleeve and the air chamber (205) and is fixedly connected to the pressing cup sleeve and the air chamber (205) respectively, the pressing swing arm (209) is connected to the pressing push rod (203) and the reset air chamber (210) respectively, the pressing swing arm (209) is rotatably engaged with the bed (114) of the bidirectional three-stroke shell making device, and the pressing swing arm (209) can rotate around the x-axis; When the crankshaft (104) is driven to rotate, the pressing push rod (203) and the pressing cup sleeve as a whole can be driven to reciprocate along their own axial direction, and the pressing cup sleeve can also move relative to the pressing push rod (203) along its own axial direction; wherein, the driving force that drives the pressing push rod (203) and the pressing cup sleeve as a whole to move along their own axial direction comes from the power that drives the crankshaft (104) to rotate and the contact pressure between the reset airbag (210) and the pressing arm (209), and the driving force that drives the pressing cup sleeve to move relative to the pressing push rod (203) along its own axial direction comes from the contact pressure between the pressing airbag (206) and the pressing cup sleeve.

15. The bidirectional three-punch shell-making apparatus according to claim 14, characterized in that: The pressing mechanism also includes a guide sleeve (212), which is slidably engaged with the airbag chamber (205), and the pressing cup sleeve is fixedly engaged with the guide sleeve (212).

16. The bidirectional three-punch shell-making apparatus according to claim 14, characterized in that: The pressure cam (121) is located on the outside of the first crank (1041) and the second crank (1042) away from the third crank (1043).

17. The bidirectional three-punch shell-making apparatus according to claim 14, characterized in that: The two sets of pressing mechanisms are distributed in a mirror-symmetric manner.

18. The bidirectional three-punch shell-making apparatus according to claim 14, characterized in that: The axial direction of the pressure push rod (203) is parallel to the y-axis direction.

19. The bidirectional three-punch shell-making apparatus according to any one of claims 12-18, characterized in that, Also includes: A drive mechanism (101) is connected to the crankshaft (104) in a transmission manner.

20. The bidirectional three-punch shell-making apparatus according to claim 19, characterized in that: The bidirectional three-punch shell-making device further includes: a first cup-lowering mechanism (108), a second cup-lowering mechanism (109), and a third cup-lowering mechanism (110). The first cup-lowering mechanism (108) is disposed on one side of the first mold (111) along the extension direction of the first punch (116) and is used to disengage the first pull-out shell (402) from the first punch (116). The second cup-lowering mechanism (109) is disposed on one side of the second mold (112) along the extension direction of the second punch (119) and is used to disengage the second pull-out shell (403) from the second punch (119). The third cup-lowering mechanism (110) is disposed on one side of the third mold (113) along the extension direction of the third punch (125) and is used to disengage the third pull-out shell (404) from the third punch (125).

21. The bidirectional three-punch shell-making apparatus according to claim 20, characterized in that: The bidirectional three-punch shell forming device further includes a shell bottom forming mechanism (130), which is arranged on the other side of the third mold (113) along the extension direction of the third punch (125) and is used to cooperate with the third punch (125) to process the bottom of the third pull-out shell (404) into the required shell bottom structure.

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