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

Abstract

The invention 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 two-way three-punching shell manufacturing device provided by the embodiment of the invention, a one-pulling punching rod, a two-pulling punching rod and an edge pressing mechanism which have relatively short stroke requirements are arranged at one end according to a forming process of shell-shaped products such as a battery shell; 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] The present invention particularly relates to a crank - connecting rod mechanism, a reciprocating impact structure, a stamping mechanism and a shell - making device, belonging to the technical field of mechanical shell - making. Background Art

[0002] The process of making slender cylindrical battery shells by the DWI process is as Figure 1 shown. That is: the raw material cup is first subjected to two - stage diameter - changing stretching (requiring edge pressing) using a stretching machine, and then subjected to one - stage thinning stretching (not requiring edge pressing) to obtain a product with qualified diameter and wall thickness. This method has a relatively high production speed for cylindrical slender shells (product diameter 26mm - 60mm; length 80mm - 230mm), about 150 per minute. However, this production method requires a can - making machine for each process, and a production line requires three can - making machines, resulting in a high cost. In addition, the existing can - making machine is an unbalanced device, with a large inertial force of moving parts and a large impact vibration during operation. Even with a special foundation structure, the vibration of the equipment itself during high - speed operation (above 150) will affect the forming accuracy of the battery shell product. For a high - precision product like the battery shell, it is difficult to further increase the speed using a standard can - making machine. In addition, for this kind of process, the length of the diameter - changing stretching in the first two steps is relatively short, generally not exceeding half of the length of the product after the third - stage thinning stretching (within 90mm), and the stroke of the standard can - making machine on the market is about 610mm, resulting in serious waste of stroke when using the standard can - making machine for the first two processes. Summary of the Invention

[0003] The main purpose of the present invention is to provide a crank - connecting rod mechanism, a reciprocating impact structure, a stamping mechanism and a shell - making device, so as to overcome the deficiencies in the prior art.

[0004] To achieve the foregoing invention purpose, the technical solutions adopted by the present invention include:

[0005] The first aspect of the embodiment of the present invention provides a two - way three - punch crank - connecting rod mechanism, which includes:

[0006] A crankshaft, a first connecting rod, a second connecting rod, and a third connecting rod;

[0007] The crankshaft has a first crank throw, a third crank throw, and a second crank throw arranged in sequence along its axial direction. The first crank throw and the second crank throw have the same crank direction, while the crank direction of the third crank throw is opposite to that of the first and second crank throws.

[0008] The second aspect of the embodiment of the present invention provides a structure for converting rotary motion into reciprocating impact motion, which includes:

[0009] The two - way three - punch crank - connecting rod mechanism;

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

[0011] The axial direction of the crankshaft 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 direction of the three-dimensional coordinate system. In the y-axis direction, the first guide rail and the second guide rail are on the same side of the crankshaft, and the third guide rail is on the other side of the crankshaft. The first slider is slidably engaged with the first guide rail, the first slider is rotatably connected to the first connecting rod, the second slider is slidably engaged with the second guide rail, the second slider is rotatably connected to the second connecting rod, the third slider is slidably engaged with the third guide rail, and the third slider is rotatably connected to the third connecting rod. When the crankshaft rotates about 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] The third aspect of the embodiment of the present invention provides a two-way three-stroke stamping mechanism, which includes:

[0013] The structure for converting rotary motion into reciprocating impact motion;

[0014] And, a first punch rod, a second punch rod, and a third punch rod;

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

[0016] The fourth aspect of the embodiment of the present invention provides a two-way three-stroke shell-making device, which includes:

[0017] The two-way three-stroke stamping mechanism, and a first mold, a second mold, and a third mold. The first mold cooperates with the first punch rod and is used to process a raw material cup to form a first drawn shell. The second mold cooperates with the second punch rod and is used to process the first drawn shell to form a second drawn shell. The third mold cooperates with the third punch rod and is used to process the second drawn shell to form a third drawn shell.

[0018] Compared with the prior art, the advantages of the present invention include:

[0019] 1) The two-way three-stroke shell-making device provided by the embodiment of the present invention integrates three forming processes onto one device, effectively reducing the equipment cost and the floor area of the production line.

[0020] 2) The two-way three-punch shell-making device provided by the embodiment of the present invention has, at any moment, the dynamic resultant force of the first connecting rod and the second connecting rod on the crankshaft being opposite in direction, exactly coincident in acting point, and almost equal in magnitude to the acting force of the third connecting rod on the crankshaft. Therefore, the equipment is in a nearly completely balanced state, effectively reducing the vibration of the equipment, increasing the production speed (up to more than 300 cans per minute), and improving the product precision.

[0021] 3) The two-way three-punch shell-making device provided by the embodiment of the present invention is nearly completely dynamically balanced with small vibration and does not require special foundation treatment, which makes the production line construction and relocation easier.

[0022] 4) The two-way three-punch shell-making device provided by the embodiment of the present invention integrates three stretching processes on one device, ensuring that the production beats of the three stretching processes are exactly the same. In this way, complex storage / supplementary tank equipment and corresponding conveying equipment between devices can be omitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0025] Figure 2 It is a process diagram of a can-making machine for producing battery cases;

[0026] Figure 3 It is a schematic diagram of the overall structure of a two-way three-punch shell-making device provided in a typical embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a two-way three-punch stamping mechanism in a two-way three-punch shell-making device provided in a typical embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of a crankshaft in a two-way three-punch shell-making device provided in a typical embodiment of the present invention;

[0029] Figure 6 It is a force state diagram of the crankshaft in a two-way three-punch shell-making device provided in a typical embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of a blank-holder mechanism in a two-way three-punch shell-making device provided in a typical embodiment of the present invention;

[0031] Figure 8 It is a partial structural schematic diagram of the blank-holding mechanism in a two-way three-punch shell-making device provided in a typical embodiment of the present invention. Detailed implementation manners

[0032] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process, principle, etc.

[0033] The first aspect of the embodiment of the present invention provides a two-way three-punch crank and connecting rod mechanism, which includes:

[0034] A crankshaft, a first connecting rod, a second connecting rod, and a third connecting rod;

[0035] The crankshaft has a first crank throw, a third crank throw, and a second crank throw arranged in sequence along its own axial direction. The first crank throw and the second crank throw have the same throw direction and are opposite to the throw direction of the third crank throw.

[0036] Further, the first connecting rod is rotationally connected to the first crank throw, the second connecting rod is rotationally connected to the second crank throw, and the third connecting rod is rotationally connected to the third crank throw. 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 coincident in action point to the force F3 exerted by the third connecting rod on the crankshaft.

[0037] Further, in the axial direction of the crankshaft, the axial distances between the third crank throw and the first crank throw, and the second crank throw are equal.

[0038] Further, the first crank throw and the second crank throw are symmetrically distributed on both sides of the third crank throw in a mirror image.

[0039] Further, the overall shape of the first crank throw, the third crank throw, and the second crank throw is a mirror-symmetrical structure.

[0040] Further, the first crank throw has a first crank throw radius, the second crank throw has a second crank throw radius, and the third crank throw has a third crank throw radius. The first crank throw radius = the second crank throw radius < the third crank throw radius.

[0041] Further, the third crank throw radius is 2-3 times the first crank throw radius / second crank throw radius.

[0042] The second aspect of the embodiment of the present invention provides a structure for converting rotational motion into reciprocating impact motion, which includes:

[0043] The two-way three-punch crank and connecting rod mechanism;

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

[0045] The axial direction of the crankshaft 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 direction of the three-dimensional coordinate system. In the y-axis direction, the first guide rail and the second guide rail are on the same side of the crankshaft, and the third guide rail is on the other side of the crankshaft. The first slider is slidably engaged with the first guide rail, and the first slider is rotatably connected to the first connecting rod. The second slider is slidably engaged with the second guide rail, and the second slider is rotatably connected to the second connecting rod. The third slider is slidably engaged with the third guide rail, and the third slider is rotatably connected to the third connecting rod. When the crankshaft rotates about 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] The third aspect of the embodiment of the present invention provides a two-way three-stroke stamping mechanism, which includes:

[0047] The structure for converting rotary motion into reciprocating impact motion;

[0048] and a first punch rod, a second punch rod, and a third punch rod;

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

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

[0051] Further, the length of the first punch rod = the length of the second punch rod < the length of the third punch rod.

[0052] The fourth aspect of the embodiment of the present invention provides a two-way three-stroke shell-making device, which includes:

[0053] The two-way three-stroke stamping mechanism, and a first mold, a second mold, and a third mold. The first mold cooperates with the first punch rod and is used to process a raw material cup to form a first drawn shell. The second mold cooperates with the second punch rod and is used to process the first drawn shell to form a second drawn shell. The third mold cooperates with the third punch rod and is used to process the second drawn shell to form a third drawn shell.

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

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

[0056] The edge pressing cam is fixed on the crankshaft, the cam follower is in transmission cooperation with the edge pressing cam, the edge pressing push rod is hinged to the cam follower, the air bag chamber is fixedly cooperated with the edge pressing push rod, the edge pressing air bag is arranged axially along the edge pressing push rod between the cup pressing sleeve and the air bag chamber and is fixedly connected to the cup pressing sleeve and the air bag chamber respectively, the edge pressing swing arm is connected to the edge pressing push rod and the reset air bag respectively, the edge pressing swing arm is rotationally cooperated with the bed body of the bidirectional three - punch shell making device, and the edge pressing swing arm can rotate around the x - axis;

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

[0058] Furthermore, the edge pressing mechanism further includes a guide sleeve, the guide sleeve is in sliding cooperation with the air bag chamber, and the cup pressing sleeve is fixedly cooperated with the guide sleeve.

[0059] Furthermore, the edge pressing cam is arranged on the outer sides of the first crank throw and the second crank throw away from the third crank throw.

[0060] Furthermore, the two sets of edge pressing mechanisms are mirror - symmetrically distributed.

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

[0062] In a more specific embodiment, the bidirectional three - punch shell making device further includes: a driving mechanism, and the driving mechanism is in transmission connection with the crankshaft.

[0063] In a more specific embodiment, the two-way three-station shell-making device further includes: a first lower cup mechanism, a second lower cup mechanism, and a third lower cup mechanism. The first lower cup mechanism is arranged on one side of the first die along the extension direction of the first punch rod and is used to separate the first drawn shell from the first punch rod. The second lower cup mechanism is arranged on one side of the second die along the extension direction of the second punch rod and is used to separate the second drawn shell from the second punch rod. The third lower cup mechanism is arranged on one side of the third die along the extension direction of the third punch rod and is used to separate the third drawn shell from the third punch rod.

[0064] In a more specific embodiment, the two-way three-station shell-making device further includes: a shell bottom forming mechanism. The shell bottom forming mechanism is arranged on the other side of the third die along the extension direction of the third punch rod and is used to cooperate with the third punch rod to process the bottom of the third drawn shell to form the required shell bottom structure.

[0065] The technical solution, its implementation process and principle will be further explained below in conjunction with the drawings and specific implementation cases. Unless otherwise specified, the drive motors, bearings, bearing seats, dies, punch rods, cams, cam followers, guide rails, brake clutch assemblies, etc. involved in the embodiments of the present invention can all be those known in the art, and they can all be obtained through commercial purchase or processed by conventional processes known in the art.

[0066] A two-way three-station high-speed shell-making device provided by an embodiment of the present invention is used to perform three stamping and stretching processes and two flanging processes on a raw material cup to obtain a shell-shaped product with qualified diameter and wall thickness.

[0067] In a more typical implementation case, please refer to Figure 3 , a two-way three-station high-speed shell-making device, including a bed body 114 and a drive mechanism 101, a two-way three-station stamping mechanism, a first die 111, a second die 112, and a third die 113 assembled on the bed body 114. The first die 111 and the second die 112 are arranged on the +y-axis direction side of the two-way three-station stamping mechanism along the y-axis direction of a three-dimensional coordinate system, and the third die 113 is arranged on the -y-axis direction side of the two-way three-station stamping mechanism along the y-axis direction of the three-dimensional coordinate system. The drive mechanism 101 is in transmission cooperation with the two-way three-station stamping mechanism and drives the two-way three-station stamping mechanism to cooperate with the first die 111, the second die 112, and the third die 113 to complete three stamping and stretching processes on the raw material cup. Specifically, please refer to Figure 1 and Figure 3, the two-way three-punch stamping mechanism cooperates with the first die 111 to punch and stretch the raw material cup 401 to form the first drawn shell 402. The two-way three-punch stamping mechanism cooperates with the second die 112 to punch and stretch the first drawn shell 402 to form the second drawn shell 403. The two-way three-punch stamping mechanism cooperates with the third die 113 to punch and stretch the second drawn shell 403 to form the third drawn shell 404.

[0068] Specifically, the two-way three-punch stamping mechanism is the core module of the two-way three-punch high-speed shell-making device. The structure of the two-way three-punch stamping mechanism will be specifically described below.

[0069] Please refer to Figure 3 , Figure 4 and Figure 5 , the two-way three-punch 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 rod 116, a second punch rod 119, and a third punch rod 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 rod 116, and the second punch rod 119 are arranged on one side of the +y-axis direction of the crankshaft 104. The third slider 124, the third guide rail 105, and the third punch rod 125 are arranged on one side of the -y-axis direction of the crankshaft 104.

[0071] The crankshaft 104 has a first crank throw 1041, a third crank throw 1043, and a second crank throw 1042 arranged in sequence along its own axial direction (i.e., the x-axis direction). Axially on the crankshaft 104, the axial distances between the third crank throw 1043 and the first crank throw 1041 and the second crank throw 1042 are equal. The first crank throw 1041 and the second crank throw 1042 have the same crank direction and opposite to that of the third crank throw 1043. The two ends of the first connecting rod 115 are respectively rotatably connected to the first crank throw 1041 and rotatably connected to the first slider 117. One end of the first punch rod 116 is fixedly connected to the first slider 117. The two ends of the second connecting rod 118 are respectively rotatably connected to the second crank throw 1042 and rotatably connected to the second slider 120. One end of the second punch rod 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 throw 1043 and rotatably connected to the third slider 124. One end of the third punch rod 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 in sliding fit with the first guide rail 106, the second guide rail 107, and the third guide rail 105.

[0072] The crankshaft 104 is in transmission connection with the driving mechanism 101 and can rotate around its own central axis under the drive of the driving 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 direction. The first punch 116, the second punch 119, and the third punch 125 cooperate with the first die 111, the second die 112, and the third die 113 respectively to perform stamping and stretching to obtain the first drawn shell 402, the second drawn shell 403, and the third drawn shell 404.

[0073] It can be understood that the linear motion of the first punch 116, the second punch 119, and the third punch 125 along the y-axis direction 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 sizes and masses of the first slider 117, the second slider 120, and the third slider 124 are the same.

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

[0075] It should be noted that in the double - acting triple - punch 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 forces of the moving parts of the double - acting triple - punch stamping mechanism and the internal forces of the equipment of the double - acting triple - punch stamping mechanism. Specifically, the force F1 is the resultant force of the inertial force of the first stretching moving part composed of the first connecting rod, the first crank throw, the first slider, and the first punch rod and the internal force of the first stretching moving part. The force F2 is the resultant force of the inertial force of the second stretching moving part composed of the second connecting rod, the second crank throw, the second slider, and the second punch rod and the internal force of the second stretching moving part. The force F3 is the resultant force of the inertial force of the third stretching moving part composed of the third connecting rod, the third crank throw, the third slider, and the third punch rod and the internal force of the third stretching moving part. For the double - acting triple - punch stamping mechanism / double - acting triple - punch high - speed shell - making device, the smaller the resultant force of the inertial forces, the smaller the equipment vibration. In the present invention, the statement that F3 and F4 are approximately equal in magnitude means that the difference between the two does not exceed 15% of F3 or F4.

[0076] Specifically, please refer to Figure 4 , Figure 5 , Figure 6 , the first crank throw 1041 and the second crank throw 1042 are symmetrically distributed in mirror image on both sides of the third crank throw 1043. In particular, the first crank throw 1041, the third crank throw 1043, and the second crank throw 1042 form an overall mirror - symmetric structure. It can be understood that the structures and structural parameters of the first crank throw 1041 and the second crank throw 1042 are exactly the same. In the x - axis direction, the central distances between the third crank throw 1043 and the first crank throw 1041, and the second crank throw 1042 are the same. Specifically, the first crank throw 1041 has a first crank - throw radius, the second crank throw 1042 has a second crank - throw radius, and the third crank throw 1043 has a third crank - throw radius. The first crank - throw radius = the second crank - throw radius < the third crank - throw radius. Preferably, the third crank - throw radius is 2 - 3 times the first crank - throw radius / the second crank - throw radius.

[0077] More specifically, the whole 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 mirror-symmetric axis of the assembly / structure formed by the first crank 1041, the third crank 1043, and the second crank 1042, as well as the assembly / 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 parallel to the y-axis of the third connecting rod 123. The structures and structural parameters of the first connecting rod 115 and the second connecting rod 118 are exactly the same. In the x-axis direction, the central distances between the third connecting rod 123 and the first connecting rod 115, and the second connecting rod 118 are the same.

[0078] Specifically, the lengths 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 direction. Specifically, the structures and dimensions of the first connecting rod 115 and the second connecting rod 118 are the same. The third connecting rod 123 has a longer length relative to the first connecting rod 115 and the second connecting rod 118, that is, 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 structures and dimensions of the first slider 117 and the second slider 120 are the same. The structure of the third slider 124 is the same as or similar to the structures of the first slider 117 and the second slider 120, but the size is larger, that is, the size of the first slider 117 is the same as the size of the second slider 120 but smaller than the size 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 size of the punch head, are set according to specific requirements. Generally, the diameter of the punch head of the first punch 116 is greater than the diameter of the punch head of the second punch 119, which is greater than the diameter of the punch head of 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 the present invention mainly come from the requirements of the product process, such as Figure 2As shown, the axial height of the third pull-out shell 404 is about 2 to 3 times the axial height of the first pull-out shell 402 and the second pull-out shell 403, which is the characteristic of tensile deformation; the axial height of the first pull-out shell 402 and the second pull-out shell 403 is small, and the required stroke is small, so the crank radius of the first crank and the second crank is correspondingly smaller, and this requirement just causes the inertia force generated by the first tensile moving component and the second tensile moving component to be about half of the inertia force generated by the third tensile moving component, so the inertia force of the whole machine is basically close to zero; especially The inertia moment is 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 moments generated by these forces is equal to the sum of the counterclockwise moments, so that the object is in a state of rotational equilibrium, that is, the object remains stationary or rotates at a constant speed). The action points of F3 and F4 in the present invention coincide, and no torque will be generated during the entire operation stage of the two-way three-stroke punching mechanism / two-way 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 it rotates, two crankshaft bearing seats 103 are fixedly arranged on the bed 114, and the two ends of the crankshaft 104 are rotatably connected to the two crankshaft bearing seats 103 via a bearing respectively. As a typical embodiment, the bearing and the crankshaft bearing seat 103 can be coaxially fixedly sleeved on the crankshaft 104.

[0080] Specifically, the driving mechanism 101 can be connected to the crankshaft 104 through the brake clutch assembly 102. The driving mechanism 101 can be a rotating driving mechanism such as a motor. The structure of the brake clutch assembly 102 itself and the matching structure / method between the brake clutch assembly 102 and the driving mechanism 101 and the crankshaft 104 can also be known in the art and are not specifically limited here.

[0081] It should be noted that the manner 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 the manner and structure known in the art, and are not limited here. The specific structure, material, etc. 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 the structure known in the art, and are not specifically limited here. The first punch rod 116, the second punch rod 119, and the third punch rod 125 correspond to and match the first mold 111, the second mold 112, and the third mold 113 respectively, and the punch structure of the first punch rod 116, the second punch rod 119, and the third punch rod 125 and 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 processed and formed in the end, and are not specifically limited here.

[0082] In a more specific embodiment, please refer back to Figure 3 , the two-way three-station shell-making device further includes a first lower cup mechanism 108, a second lower cup mechanism 109, and a third lower cup mechanism 110. The first lower cup mechanism 108 is disposed on the -y axis side of the first mold 111 along the extension direction of the first punch 116 and is used to separate the first drawn shell 402 from the first punch 116. The second lower cup mechanism 109 is disposed on the -y axis side of the second mold 112 along the extension direction of the second punch 119 and is used to separate the second drawn shell 403 from the second punch 119. The third lower cup mechanism 110 is disposed on the +y axis side of the third mold 113 along the extension direction of the third punch 125 and is used to separate the third drawn shell 404 from the third punch 125. It should be noted that the first lower cup mechanism 108, the second lower cup mechanism 109, and the third lower cup mechanism 110 can adopt a functional mechanism that can cooperate with the punch to realize the demolding of the product formed by stamping and stretching, and it can adopt a structure known in the art, and its specific structure is not limited and described herein.

[0083] In a more specific embodiment, please refer back to Figure 3 , the two-way three-station shell-making device further includes a shell bottom forming mechanism 130. The shell bottom forming mechanism 130 is disposed on the -y axis 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 drawn shell 404 to form 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 a functional mechanism known in the art, and its specific structure is not limited and described herein.

[0084] In a more specific embodiment, please refer to Figure 3 , the two-way three-station shell-making device further includes two sets of edge pressing mechanisms 200. The two sets of edge pressing mechanisms 200 are respectively used to tightly fix the raw material cup (specifically, the edge of the raw material cup) 401 before processing the raw material cup 401 into the first drawn shell 402, and tightly fix the first drawn shell (specifically, the edge of the first drawn shell) 402 before processing the first drawn shell 402 into the second drawn shell 403, so as to assist in realizing the stamping and stretching processing of the first drawn shell 402 and the second drawn shell 403.

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

[0086] The blanking cam 121 is fixed on the crankshaft 104. The cam follower 201 is in transmission cooperation with the blanking cam 121. The blanking push rod 203 is hinged to the cam follower 201. The airbag chamber 205 is fixedly cooperated with the blanking push rod 203. The blanking airbag 206 is arranged axially along the blanking push rod 203 between the blanking cup sleeve and the airbag chamber 205 and is fixedly connected to the blanking cup sleeve and the airbag chamber 205 respectively. One end of the blanking swing arm 209 is connected to the blanking push rod 203 and is rotationally cooperated with the blanking push rod 203 through the follower bearing 204, and the other end is fixedly connected to the reset airbag 210. The middle part of the blanking swing arm 209 is rotationally cooperated with the bed body 114 through the spindle 211. The blanking swing arm 209 can rotate around the x-axis;

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

[0088] Specifically, the two blanking mechanisms are symmetrically distributed on both sides of the double-sided three-station stamping mechanism along the x-axis direction. It can be understood that the overall structural composition and overall configuration parameters of the two blanking mechanisms are the same, and their specific configuration parameters can be set according to specific requirements and are not specifically limited here. The main difference between them is the different sizes of the blanking cup sleeves. The two blanking cup sleeves of the two blanking mechanisms can be respectively defined as the first blanking cup sleeve 207 and the second blanking cup sleeve 208. It can be understood that in the x-axis direction, the two blanking cams 121 are symmetrically distributed on both sides of the third crank throw 1043. Specifically, the two blanking cams 121 are respectively arranged between the first crank throw 1041, the second crank throw 1042 and the two crankshaft bearing seats 103.

[0089] Specifically, please refer to Figure 7 and Figure 8 At the same time, the blanking mechanism further includes a guide sleeve 212. The guide sleeve 212 is in sliding cooperation with the airbag chamber 205 axially along its own axis. The blanking cup sleeve is fixedly cooperated with the guide sleeve 212. Specifically, the blanking airbag 206 and the reset airbag 210 can also be connected to a gas supply mechanism, etc. The gas pressure in the blanking airbag 206 and the reset airbag 210 is adjusted through the gas supply mechanism. By introducing compressed air into the blanking airbag 206, the forces on both sides of the blanking airbag can be adjusted by adjusting the air pressure value respectively. More specifically, the airbag chambers of the two blanking mechanisms can be fixed as a whole.

[0090] Specifically, in order to ensure the coaxiality of the two groups of cup pressing sleeves with the raw material cup 401 and the first pulling shell 402, the edge pressing mechanism further includes a plurality of edge pressing bearing seats 202 and a plurality of linear bearings. The plurality of edge pressing bearing seats 202 are sequentially and spacedly fixed on the bed 114 in the y-axis direction. Each linear bearing is fixed on an edge pressing bearing seat 202, and the edge pressing push rod 203 coaxially passes through the plurality of linear bearings.

[0091] In a more specific implementation, the two-way three-stamping shell device further includes a conveyor line, which is used to run between the first lower cup mechanism 108, the second lower cup mechanism 109, and the third lower cup mechanism 110, and is used to convey raw material cups and intermediate products of shell-shaped products, etc. The conveyor line can adopt a structure known in the art and will not be limited herein.

[0092] It should be noted that the two-way three-stamping shell device of course may further include, for example, a controller and other functional modules for product quality inspection, etc., which will not be specifically limited herein.

[0093] The production process of a shell-shaped product may include: the raw material cup 401 enters the entrance of the first mold 111 through the first lower cup mechanism 108. The driving mechanism 101 drives the crankshaft 104 to rotate. The first cup pressing sleeve 207 moves in the +y-axis direction and presses the raw material cup 401. The crankshaft 104 continues to rotate and drives the first punch 116 to move in the +y-axis direction and drives the raw material cup 401 to pass through the first mold 111 to form the first pulling shell 402; the first cup pressing sleeve 207 resets in the -y-axis direction. After the first pulling shell 402 passes through the bottom dead center, it moves in the -y-axis direction to complete demolding; the first pulling shell 402 enters the second lower cup mechanism 109 through the conveyor line. The crankshaft 104 rotates again. The second cup pressing sleeve 208 moves in the +y-axis direction and presses the first pulling shell 402. The crankshaft 104 continues to rotate and drives the second punch 119 to move in the +y-axis direction and drives the first pulling shell 402 to pass through the second mold 112 to form the second pulling shell 403. After passing through the second mold 119, it becomes the second pulling shell 403. Similarly, the second pulling 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 pulling shell 404, and cooperates with the shell bottom forming mechanism 130 to complete the processing of the shell-shaped product. The shell-shaped product therein may be a metal shell such as a battery shell or a beverage can.

[0094] A two-way three-stroke shell making device provided by an embodiment of the present invention arranges the punching rods and blank holding mechanisms for the first draw and the second draw with shorter stroke requirements and the three-draw punching rod mechanism without blank holding with longer stroke requirements at two ends according to the forming process of shell-shaped products such as battery shells. The resultant force of the two ends driving the crankshaft cancels each other out, enabling the equipment to reach a state close to complete dynamic balance, greatly reducing the vibration of the equipment, effectively improving the forming accuracy and production speed of products while saving expensive foundations. In addition, integrating the three forming processes on one piece of equipment also greatly reduces the equipment cost and the floor area of the production line.

[0095] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A two-way three-stroke crank connecting rod mechanism, characterized in that Comprising: A crankshaft (104), a first connecting rod (115), a second connecting rod (118), and a third connecting rod (123); The crankshaft (104) has a first crank throw (1041), a third crank throw (1043), and a second crank throw (1042) arranged in sequence along its own axial direction. The first crank throw (1041) and the second crank throw (1042) have the same crank direction and are opposite to the crank direction of the third crank throw.

2. The double-direction three-stroke crank connecting rod mechanism according to claim 1, wherein: The first connecting rod (115) is rotatably connected to the first crank throw (1041), the second connecting rod (118) is rotatably connected to the second crank throw (1042), and the third connecting rod (123) is rotatably connected to the third crank throw (1043). At any moment 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) is approximately equal in magnitude, opposite in direction, and coincident in acting point to the force F3 exerted by the third connecting rod (123) on the crankshaft (104).

3. The double-direction three-stroke crank connecting rod mechanism according to claim 1, characterized in that: Axially on the crankshaft (104), the axial distances between the third crank throw (1043) and the first crank throw (1041) and the second crank throw (1042) are equal; And / or, the first crank throw (1041) and the second crank throw (1042) are symmetrically distributed on both sides of the third crank throw (1043) in a mirror image; Preferably, the first crank throw (1041), the third crank throw (1043), and the second crank throw (1042) as a whole form a mirror-symmetric structure.

4. The double-direction three-stroke crank connecting rod mechanism according to claim 1 or 2, characterized in that: The first crank throw (1041) has a first crank radius, the second crank throw (1042) has a second crank radius, the third crank throw (1043) has a third crank radius, and the first crank radius = the second crank radius < the third crank radius; Preferably, the third crank radius is 2 - 3 times the first crank radius / the second crank radius.

5. A structure for converting rotary motion into reciprocating impact motion, characterized in that, Comprising: The bidirectional three-stroke crank and connecting rod mechanism according to any one of claims 1 - 4; And a first slider (117), a second slider (120), a third slider (124), a first guide rail (106), a second guide rail (107), and a third guide rail (105); The axial direction of the crankshaft (104) is 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 direction 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), and the second slider (120) is rotatably connected to 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 to the third connecting rod (123). When the crankshaft (104) rotates about 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.

6. A two-way triple-punch stamping mechanism, characterized in that, Comprising: The structure for converting rotational motion into reciprocating impact motion according to any one of claims 1-4; And, a first punch rod (116), a second punch rod (119), and a third punch rod (125); In the y-axis direction, the first punch rod (116) and the second punch rod (119) are arranged on the same side of the crankshaft (104) along the three-dimensional coordinate system, and the third punch rod (125) is arranged on the other side of the crankshaft (104). The first punch rod (116) is fixedly connected to the first slider (117), the second punch rod (119) is fixedly connected to the second slider (120), and the third punch rod (125) is fixedly connected to the third slider (124).

7. The two-way three-stroke stamping mechanism according to claim 6, characterized in that: The length directions of the first punch rod (116), the second punch rod (119), and the third punch rod (125) are parallel to the y-axis direction; Preferably, the length of the first punch rod (116) = the length of the second punch rod (119) < the length of the third punch rod (125).

8. A two-way three-shot shell making device, characterized in that, Comprising: The two-way three-punch stamping mechanism according to claim 6 or 7, and a first die (111), a second die (112), and a third die (113). The first die (111) cooperates with the first punch rod (116) and is used to process the raw material cup (401) to form a first drawn shell (402). The second die (112) cooperates with the second punch rod (119) and is used to process the first drawn shell (402) to form a second drawn shell (403). The third die (113) cooperates with the third punch rod (125) and is used to process the second drawn shell (403) to form a third drawn shell (404).

9. The two-way three-flush shell-making device according to claim 8, wherein Further comprising: Two sets of edge pressing mechanisms, which are respectively used to fix the raw material cup (401) before processing the raw material cup (401) into the first drawn shell (402) and to fix the first drawn shell (402) before processing the first drawn shell (402) into the second drawn shell (403); Preferably, the edge pressing mechanism includes an edge pressing cam (121), a cam follower (201), an edge pressing push rod (203), an airbag chamber (205), an edge pressing airbag (206), an edge pressing swing arm (209), a reset airbag (210), and a cup pressing sleeve; The edge pressing cam (121) is fixed on the crankshaft (104), the cam follower (201) is in transmission cooperation with the edge pressing cam (121), the edge pressing push rod (203) is hinged to the cam follower (201), the airbag chamber (205) is fixedly cooperated with the edge pressing push rod (203), the edge pressing airbag (206) is arranged axially along the edge pressing push rod (203) between the cup pressing sleeve and the airbag chamber (205) and is fixedly connected to the cup pressing sleeve and the airbag chamber (205) respectively, the edge pressing swing arm (209) is connected to the edge pressing push rod (203) and the reset airbag (210) respectively, the edge pressing swing arm (209) is rotationally cooperated with the bed body (114) of the double-sided three-stamping shell device, and the edge pressing swing arm (209) can rotate around the x-axis; When the crankshaft (104) is driven to rotate, the edge pressing push rod (203) and the cup pressing sleeve as a whole can be driven to reciprocate axially along their own axes, and the cup pressing sleeve can also move axially relative to the edge pressing push rod (203); wherein, the driving force for driving the edge pressing push rod (203) and the cup pressing sleeve as a whole to move axially along their own axes comes from the power for driving the rotation of the crankshaft (104) and the contact pressure between the reset airbag (210) and the edge pressing swing arm (209), and the driving force for driving the cup pressing sleeve to move axially relative to the edge pressing push rod (203) comes from the contact pressure between the edge pressing airbag (206) and the cup pressing sleeve; Preferably, the edge pressing mechanism further includes a guide sleeve (212), the guide sleeve (212) is in sliding cooperation with the airbag chamber (205), and the cup pressing sleeve is fixedly cooperated with the guide sleeve (212); Preferably, the edge pressing cam (121) is arranged on the outer sides of the first crank throw (1041) and the second crank throw (1042) away from the third crank throw (1043); Preferably, the two sets of edge pressing mechanisms are mirror-symmetrically distributed; Preferably, the axial direction of the edge pressing push rod (203) is parallel to the y-axis direction.

10. The two-way three-shot shell-making device according to claim 8 or 9, characterized in that, Further included: A driving mechanism (101), the driving mechanism (101) is in transmission connection with the crankshaft (104); Preferably, the bidirectional three - punch shell making device further includes: a first lower cup mechanism (108), a second lower cup mechanism (109), and a third lower cup mechanism (110). The first lower cup mechanism (108) is arranged on one side of the first mold (111) along the extension direction of the first punch rod (116), and is used to separate the first pulled - out shell (402) from the first punch rod (116). The second lower cup mechanism (109) is arranged on one side of the second mold (112) along the extension direction of the second punch rod (119), and is used to separate the second pulled - out shell (403) from the second punch rod (119). The third lower cup mechanism (110) is arranged on one side of the third mold (113) along the extension direction of the third punch rod (125), and is used to separate the third pulled - out shell (404) from the third punch rod (125); Preferably, the bidirectional three - punch shell making device further includes: a shell bottom forming mechanism (130). The shell bottom forming mechanism (130) is arranged on the other side of the third mold (113) along the extension direction of the third punch rod (125), and is used to cooperate with the third punch rod (125) to process the bottom of the third pulled - out shell (404) to form a required shell bottom structure.

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