CN211839729U - High-speed balanced bidirectional double-punching tank body stretcher - Google Patents

Abstract

The utility model provides a balanced two-way pair of jar body stretcher of high speed, includes jumper bar actuating mechanism, its characterized in that: the punch driving mechanism is formed by connecting a crankshaft, two identical connecting rods, two identical sliding rails, two identical sliding blocks and two identical punches. The crankshaft is rotatably supported by a bearing, and a first crank throw and a second crank throw are arranged on the crankshaft. Compared with the prior art, the scheme omits a swing rod and secondary connection in each set of punch driving mechanism, greatly simplifies the structure, still keeps all original functions and forms element omission.

Description

High-speed balanced bidirectional double-punching tank body stretcher

Technical Field

The utility model relates to a jar body stretching equipment, in particular to two-way two towards jar body stretcher that simple structure has better technological force and moment balance ability under high-speed operating condition (stretching speed 400 times/minute). The can body refers to a metal member having a can body shape, such as a can body of a can, a can body of a battery case, and other metal objects having a can body shape.

Background

Metal can bodies have a wide range of uses in people's daily life and industry. The can body of the pop can and the shell of the lithium battery in the power battery are typical. The using amount of the cans is huge every year, and particularly, the cans of the pop cans are more and more in demand along with the continuous improvement of the living standard of people.

Pop cans are generally made of aluminum or iron, and have a structure including a can body and a lid, wherein the can body is formed by drawing a metal sheet through a drawing machine. The existing can body stretching machine is generally composed of a cup feeding mechanism, a blank pressing mechanism, a punch rod driving mechanism, a stretching die and a can discharging mechanism. The cup feeding mechanism is used for conveying a can blank (a pre-stretched cup-shaped component) before stretching, the edge pressing mechanism is used for pressing the can blank during stretching, the punch rod driving mechanism is used for providing a stamping stroke during stretching of the can body, the stretching die is used for stretching and forming the can body, and the can discharging mechanism is used for discharging and outputting the can body after stretching. For the can body stretching machine, the technical core lies in the design and layout of the punch rod driving mechanism and the edge pressing mechanism. With the technological progress and the market demand, the can body stretching machines are developed to high speed and high quality, which requires on the one hand a continuous increase in stretching speed (400 times/min) and on the other hand a high quality of the finished can body stretch forming. This places very high demands on the process force and moment balance of the can body stretching machine in its own idle stroke. It is therefore a technical challenge in the art to maintain the process force and moment balance of the can body stretcher at high speed operating conditions.

Chinese patent CN102581107A discloses an invention patent named bidirectional double-punching can body stretcher with application number 201210040629. X. According to the novel multi-shaft crankshaft punching die, two sets of punching rod driving mechanisms share one crankshaft and are arranged in a symmetrical layout mode, and technological force and moment of moving parts such as a swinging rod, a sliding block and a punching rod and reaction force generated in a tank body forming process can be balanced, so that the load of a crankshaft supporting bearing is remarkably reduced, the design and processing requirements of the bearing are lowered, and the service life is prolonged. Although the patent achieves obvious effect on reducing process force and moment through the symmetrical layout of the two sets of punch rod mechanisms, the following problems still exist: first, the structure is complex and there are many moving parts. The technical scheme includes that the stamping device comprises two sets of stamping rod driving mechanisms, wherein each set of stamping rod driving mechanism consists of a crankshaft, a main connecting rod, a swing rod, a secondary connecting rod, a guide rail, a slide block and a stamping rod, wherein the swing rod can play a role in enlarging a stamping stroke and can reduce the radius of a crank throw; the secondary connecting rod can reduce the pressure angle between the sliding block and the guide rail, which is beneficial to the accuracy and stability of the sliding mechanism, however, the existence of the swing rod and the secondary connecting rod also causes the whole size of the device to be enlarged, the mechanism to be complicated, and the number of moving parts to be increased. Second, the device still has deficiencies in overall layout and stress. For example, when the first layout design shown in fig. 5 is adopted, as the two swing rods keep symmetry during movement, the process force and moment of the equipment in the horizontal direction can be balanced, but not unbalanced in the vertical direction, and the two are superposed. If the second layout design shown in the patent figure 9 is adopted, although the horizontal direction and the vertical direction can be basically balanced from the view point of technological force and moment, the structure becomes very complicated, and the left and right stretching stations have large drop in the vertical direction.

In view of this, how to design a bidirectional double-punching can body stretcher with a simpler structure is the subject of the research of the utility model.

Disclosure of Invention

The utility model provides a balanced two-way two jar body stretcher of dashing of high speed, its purpose is to solve the complicated problem of current two-way two jar body stretcher structure of dashing.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a balanced two-way pair of jar body stretcher of high speed, includes the jumper bar actuating mechanism, and its innovation lies in: the punch driving mechanism is formed by connecting the following components:

and the crankshaft is rotatably supported by the bearing and is provided with a first crank throw and a second crank throw, wherein the first crank throw and the second crank throw are opposite in turning direction on a plane passing through the axis of the crankshaft.

Two links, a first link and a second link.

Two slide rails, namely a first slide rail and a second slide rail.

Two slides, a first slide and a second slide.

Two punches, a first punch and a second punch.

Wherein:

the first crank throw is rotatably connected with one end of a first connecting rod, the other end of the first connecting rod is rotatably connected with a first sliding block, the first sliding block is installed on a first sliding rail and is in sliding connection relative to the first sliding rail, the first sliding rail is fixed relative to a base of the tank body stretching machine, and the first sliding block is fixedly connected with a first punch rod.

The second crank throw is rotatably connected with one end of a second connecting rod, the other end of the second connecting rod is rotatably connected with a second sliding block, the second sliding block is mounted on a second sliding rail and is in sliding connection with the second sliding rail, the second sliding rail is fixed relative to a base of the tank body stretching machine, and the second sliding block is fixedly connected with a second punch rod.

The first crank throw, the first connecting rod, the first sliding block, the first sliding rail and the first plunger are positioned at one end side of the crankshaft and form a first plunger driving mechanism; the second crank throw, the second connecting rod, the second sliding block, the second sliding rail and the second plunger are positioned at the other end side of the crankshaft and form a second plunger driving mechanism.

On a plane which is transverse to the axis of the crankshaft, the first punch driving mechanism and the second punch driving mechanism are symmetrically arranged by taking the rotation center point of the crankshaft as a reference.

The relevant content in the above technical solution is explained as follows:

1. in the scheme, the tank body stretcher as a whole structurally comprises a tank body, two sets of dies, two sets of cup inlet mechanisms and two sets of tank outlet mechanisms. Since the innovations of the present invention are embodied in the ram drive mechanism and the hold-down mechanism, which may be of the prior art, they have not been described or illustrated in detail in the above-described arrangements, as will be appreciated and accepted by those skilled in the art.

2. In the above scheme, the "edge pressing mechanism" refers to a mechanism (pressing at the bottom edge of the can blank) for pressing the can blank when the can body is stretched. The tank body stretching machine is an indispensable component, but the specific structure and form of the middle edge pressing mechanism do not influence the expression and embodiment of the innovative content of the utility model. Therefore, the above-mentioned schemes only give the term of the edge pressing mechanism, and the specific structure and form thereof are not clear.

3. In the above-described aspect, the term "on a plane intersecting the axis of the crankshaft" corresponds to the plane shown in fig. 1. The "plane through the axis of the crankshaft" corresponds to the plane shown in fig. 2.

4. In the above scheme, the first connecting rod and the second connecting rod may have the same shape and size. The first and second slide rails may be the same in shape and size. The first slider and the second slider may be identical in shape and size. The first and second punches may be the same shape and size.

5. In the above scheme, in order to improve the balance capability of the technological force and the moment of the tank body stretching machine, a first blank pressing cam can be fixedly arranged on the crankshaft for the first blank pressing mechanism, and a second blank pressing cam can be fixedly arranged for the second blank pressing mechanism. The first blank pressing mechanism is arranged corresponding to the first punch rod driving mechanism, the first blank pressing cam is in driving connection with the first blank pressing mechanism and is provided with a first driving point, the second blank pressing mechanism is arranged corresponding to the second punch rod driving mechanism, and the second blank pressing cam is in driving connection with the second blank pressing mechanism and is provided with a second driving point. On a plane passing through the axis of the crankshaft, the position of a first driving point of the first edge pressing cam is opposite to the position of a second driving point of the second edge pressing cam; under the working condition, the tensile force applied to the first crank by the first connecting rod is defined as a first tensile force, the tensile force applied to the second crank by the second connecting rod is defined as a second tensile force, the blank holding force applied to the first blank holding cam by the first blank holding mechanism is a first blank holding force, the blank holding force applied to the second blank holding cam by the second blank holding mechanism is a second blank holding force, the first tensile force and the second tensile force are parallel to each other and have opposite directions on a plane passing through the axis of the crankshaft, a first moment is formed, the first blank holding force and the second blank holding force are parallel to each other and have opposite directions, a second moment is formed, the first moment and the second moment are opposite in directions, and the tank body stretching machine can integrally keep moment balance on the plane passing through the axis of the crankshaft when working. The blank pressing force refers to a process force for pressing a can blank in the stretching process of the can body, and does not include an inertia force in the movement process of the mechanism. The "stretching force" refers to the process force used to stretch the can body during the can body stretching process, and does not include the inertial force during the mechanism movement.

The design principle and the conception of the utility model are as follows: in order to solve the complicated problem of current two-way jar body stretcher structure, the utility model discloses in jar body stretcher's structural design, to current two-way jar body stretcher (CN 102581107A, the scheme of fig. 5), all saved pendulum rod and inferior connection in every set of jumper bar actuating mechanism, be connected to the slider with the other end direct rotation of main connecting rod. Thereby simplifying the most important punch driving mechanism in the structure of the tank body stretcher. In order to solve the not good problem of technological force and moment balance effect, the utility model discloses to first crank throw design has first blank pressing cam in crankshaft structure design, to second crank throw design have second blank pressing cam. Meanwhile, the edge pressing force of the first edge pressing mechanism acting on the first edge pressing cam and the edge pressing force of the second edge pressing mechanism acting on the second edge pressing cam are designed to be parallel to each other and opposite in direction. Finally, the technical measures that the first torque and the second torque are opposite in direction can be utilized to achieve the aim of torque balance.

Because of above-mentioned technical scheme's application, the utility model discloses compare with current two-way two jar body stretcher that dashes and have following advantage and effect:

1. the utility model discloses all saved pendulum rod and inferior connection in every set of jumper bar actuating mechanism. The structure is greatly simplified from the perspective of practical effects, all original functions are still kept, elements are omitted from the perspective of innovation of the utility model, and therefore the novel multifunctional electric kettle has outstanding substantive characteristics. For the existing bidirectional double-punching can body stretching machine (CN 102581107A, scheme in figure 5), the swing rod can play a role in enlarging the punching stroke, the crank radius can be reduced, the pressure angle between the slide block and the guide rail can be reduced by the secondary connecting rod, the accuracy and stability of the sliding mechanism are facilitated, however, the whole size of the equipment is increased due to the existence of the swing rod and the secondary connecting rod, the mechanism is complicated, and moving parts are increased. From the design of the existing bidirectional double-punch tank body stretching machine, it seems that the oscillating bar and the secondary connection cannot be omitted in the punch rod driving mechanism, but the utility model makes a breakthrough in the aspect of structural design, which is obviously non-obvious to those skilled in the art. As for omit some atress and the balance problem that pendulum rod and secondary connecting rod probably brought the utility model discloses also overcome through the arrangement of blank pressing cam.

2. The utility model discloses be provided with first blank pressing cam and second blank pressing cam specially in bent axle structural design. This design plays a very important role in the stressing and balancing of the ram drive mechanism. As known to those skilled in the art, the ram driving mechanism is the core of the can body stretching machine, and is a motion mechanism with large stress and large inertia, and especially in a high-speed working state (stretching speed is 400 times/min), the problems of technological force and moment balance appear to be prominent from the whole equipment, and the ram driving mechanism not only affects the service life of the equipment, but also directly affects the stretching quality and effect. For the existing bidirectional double-punch can body stretcher (CN 102581107A), the first layout design shown in fig. 5, because two swing rods keep symmetry during the movement, the process force and moment of the device in the horizontal direction (horizontal direction shown in fig. 5, relative to the left and right directions of the device "on the plane of the transverse crankshaft axis") can be kept balanced, but in the horizontal plane (relative to the left and right directions of the device "on the plane of the transverse crankshaft axis"), because the drawing force of the first connecting rod to the first crank throw and the drawing force of the second connecting rod to the second crank throw are parallel to each other and opposite in direction, the first moment is formed, and the bearing force of the crankshaft and the supporting shaft is unbalanced. Especially the utility model discloses left out behind the pendulum rod, increased the crank radius in order to satisfy the punching press stroke, this makes moment balance problem seem outstanding outward, to the impact and the load grow of crankshaft support bearing. The utility model discloses a measure that solves this problem and adopt utilizes two blank pressing cams to arrange on the contrary with the first drive point of first blank pressing cam and the second drive point position of second blank pressing cam, finally on the plane of crossing the bent axle axis, first moment and second moment opposite direction to offset each other, make jar body stretcher during operation keep whole moment balance on the plane of crossing the bent axle axis. Therefore, the utility model discloses not only absorb current two-way two towards jar body stretcher (CN 102581107A) and kept whole balanced advantage of atress on the plane of transversal crankshaft axis, overcome current two-way two towards jar body stretcher (CN 102581107A) moment unbalance not enough on the plane of crossing the crankshaft axis moreover, obtained apparent effect, made jar body stretcher during operation keep whole moment balance on the plane of crossing the crankshaft axis.

3. The utility model discloses can realize not having the ground installation. The tank body stretching machine belongs to large-scale stretching equipment, and particularly needs foundation installation due to large technological force and moment and large vibration of the equipment under a high-speed working state (stretching speed of 400 times/minute). At this point, a one meter deep pit needs to be excavated, and then a large concrete foundation is poured. And finally fixing the tank body stretcher on a concrete foundation. Because the utility model discloses fully considered the balanced factor of power and moment in the complete machine design, the equipment of making can realize not having the ground installation, has brought very big facility for the installation, also practices thrift installation cost simultaneously.

Drawings

FIG. 1 is a schematic diagram of a ram driving mechanism of the present invention;

FIG. 2 is a schematic diagram of a crankshaft of the present invention;

FIG. 3 is a perspective view of a ram drive mechanism according to an embodiment of the present invention;

fig. 4 is a perspective view of a crankshaft according to an embodiment of the present invention.

In the above drawings: 1. a crankshaft; 11. a first crank throw; 12. a second crank throw; 13. a first blank pressing cam; 14. a second blank pressing cam; 2. a connecting rod; 21. a first link; 22. a second link; 3. a slide rail; 31. a first slide rail; 32. a second slide rail; 4. a slider; 41. a first slider; 42. a second slider; 5. punching; 51. a first ram; 52. a second ram; F1. a first tensile force; F2. a second tensile force; F3. a first blank holder force; F4. a second blank holder force; n1. a first moment; n 2. second moment.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example (b): high-speed balanced bidirectional double-punching tank body stretcher

This jar body stretcher comprises box, two sets of moulds, two sets of blank pressing mechanisms, two sets of cup mechanisms of advancing, two sets of jumper bar actuating mechanism and two sets of jar mechanisms of going out, wherein, because the utility model discloses an innovation embodiment is on jumper bar actuating mechanism and blank pressing mechanism, and all the other structures or mechanism all can adopt prior art, so do not describe in detail and introduce in this embodiment, and this that technical person in the field can understand and accept.

Referring to fig. 1-4, the ram drive mechanism is formed by connecting the following components:

a crankshaft 1 (see fig. 2 and 4), the crankshaft 1 is rotatably supported by bearings, and the crankshaft 1 is provided with a first crank throw 11, a second crank throw 12, a first blank holder cam 13 and a second blank holder cam 14. The first and second throws 11, 12 are arranged adjacent to each other in the axial direction of the crankshaft 1, the first blank holder cam 13 is arranged axially outside the first throw 11, and the second blank holder cam 14 is arranged axially outside the second throw 12 (see fig. 2).

Two identical links 2, a first link 21 and a second link 22 (see fig. 1 and 3).

Two identical slide rails 3, namely a first slide rail 31 and a second slide rail 32 (see fig. 1).

Two identical slides 4, namely a first slide 41 and a second slide 42 (see fig. 1 and 3).

Two identical punches 5, a first punch 51 and a second punch 52 (see fig. 1 and 3).

Wherein:

the first bell crank 11 is rotatably connected with one end of a first connecting rod 21, the other end of the first connecting rod 21 is rotatably connected with a first sliding block 41, the first sliding block 41 is mounted on a first sliding rail 31 and is slidably connected with the first sliding rail 31, the first sliding rail 31 is fixed relative to the machine base of the tank body stretching machine, and the first sliding block 41 is fixedly connected with a first punch rod 51 (see fig. 1 and 3).

The second bell crank 12 is rotatably connected with one end of a second connecting rod 22, the other end of the second connecting rod 22 is rotatably connected with a second sliding block 42, the second sliding block 42 is mounted on a second sliding rail 32 and is slidably connected with the second sliding rail 32, the second sliding rail 32 is fixed relative to the machine base of the tank body stretching machine, and the second sliding block 42 is fixedly connected with a second plunger 52 (see fig. 1 and 3).

The first bell crank 11, the first connecting rod 21, the first slider 41, the first slide rail 31, the first punch 51, and the first blank holder cam 13 are located on one end side of the crankshaft 1, and constitute a first punch driving mechanism (see fig. 1 and 3). The second bell crank 12, the second connecting rod 22, the second slider 42, the second slide rail 32, the second punch 52, and the second binder cam 14 are located on the other end side of the crankshaft 1, and constitute a second punch driving mechanism (see fig. 1 and 3).

The blank pressing mechanism is composed of a first blank pressing mechanism and a second blank pressing mechanism, wherein the first blank pressing mechanism is arranged corresponding to the first punch driving mechanism, the first blank pressing cam 13 is in driving connection with the first blank pressing mechanism and has a first driving point, the second blank pressing mechanism is arranged corresponding to the second punch driving mechanism, and the second blank pressing cam 14 is in driving connection with the second blank pressing mechanism and has a second driving point. In this embodiment, it is unimportant to send first blank pressing mechanism and the concrete structure of second blank pressing mechanism, can adopt prior art, does not influence the utility model discloses an implementation and effect as long as first blank pressing cam 13 can drive first blank pressing mechanism and go to carry out the task that compresses tightly at jar base edge before jar body is tensile just can.

On a plane (namely the plane shown in figure 1) which is transverse to the axis of the crankshaft 1, the first punch driving mechanism and the second punch driving mechanism are symmetrically arranged by taking the rotation center point of the crankshaft 1 as a reference, so that the overall stress balance is kept on the plane which is transverse to the axis of the crankshaft 1 when the can body stretching machine works (see figure 1).

On the plane passing through the axis of the crankshaft 1 (i.e. the plane shown in fig. 2), the first crank throw 11 and the second crank throw 12 are oppositely bent, the first blank pressing cam 13 and the second blank pressing cam 14 are fixedly connected relative to the crankshaft 1, and on the plane passing through the axis of the crankshaft 1, the first driving point of the first blank pressing cam 13 is opposite to the second driving point of the second blank pressing cam 14; in an operating state, the tensile force applied by the first connecting rod 21 to the first crank throw 11 is defined as a first tensile force F1, the tensile force applied by the second connecting rod 22 to the second crank throw 12 is defined as a second tensile force F2, the blank holding force applied by the first blank holding mechanism to the first blank holding cam 13 is defined as a first blank holding force F3, the blank holding force applied by the second blank holding mechanism to the second blank holding cam 14 is defined as a second blank holding force F4, the first tensile force F1 and the second tensile force F2 are parallel to each other and opposite in direction on a plane passing through the axis of the crankshaft 1, and form a first moment N1, the first blank holding force F3 and the second blank holding force F4 are parallel to each other and opposite in direction, and form a second moment N2, and the first moment N1 and the second moment N2 are opposite in direction, so that the integral moment balance is kept on the plane passing through the axis of the crankshaft 1 when the can body stretching machine is operated (see fig. 1).

Other embodiments and structural changes of the present invention are described below as follows:

1. in the above embodiment, as shown in fig. 2, the first throw 11 and the second throw 12 are arranged adjacent to each other in the axial direction of the crankshaft 1, the first blank holder cam 13 is arranged axially outward of the first throw 11, and the second blank holder cam 14 is arranged axially outward of the second throw 12. However, the present invention is not limited to this, and the first blank holder cam 13 and the second blank holder cam 14 may be disposed adjacently in the axial direction of the crankshaft 1 instead, the first crank throw 11 is disposed on the axially outer side of the first blank holder cam 13, and the second crank throw 12 is disposed on the axially outer side of the second blank holder cam 14. It is possible to change to other arrangements, but it is essential that the first moment N1 and the second moment N2 are opposite in direction, and act as a balancing moment in a plane passing through the axis of the crankshaft 1.

2. In the above embodiment, two edge pressing cams are used, and the first driving point of the first edge pressing cam 13 and the second driving point of the second edge pressing cam 14 are arranged oppositely, so that the first moment N1 and the second moment N2 are opposite in direction and offset with each other, and the overall moment balance is maintained on the plane passing through the crankshaft axis when the can body stretching machine works. In fact, in the present invention, it is necessary that the first moment N1 and the second moment N2 are opposite in direction, but it is not necessary that the first moment N1 and the second moment N2 are completely offset, which is determined according to a specific design. Being able to achieve complete cancellation is the best choice, but also allows the choice of a partial cancellation scheme, which can ultimately be confirmed by the combined effect.

3. In the above embodiment, two identical links 2, i.e., the first link 21 and the second link 22, are employed. Two identical slide rails 3 are used, namely a first slide rail 31 and a second slide rail 32. Two identical slides 4 are used, namely a first slide 41 and a second slide 42. Two identical punches 5 are used, namely a first punch 51 and a second punch 52. However, the present invention is not limited to this, for example, the first link 21 and the second link 22 may have different shapes or different sizes. The first slider 41 and the second slider 42 may have different shapes or different sizes.

4. In the above embodiments, the specific structure and form of the edge pressing mechanism are not described, because the edge pressing mechanism is an indispensable component for the can body stretching machine, but the specific structure and form of the edge pressing mechanism do not affect the expression and embodiment of the innovative content of the present invention. Therefore, the above-mentioned schemes only give the term of the edge pressing mechanism, and the specific structure and form thereof are not clear. What kind of blank pressing mechanism that actually adopts with the utility model discloses it is irrelevant, as long as this blank pressing mechanism can with bent axle 1 on first blank pressing cam 13 and the cooperation work of second blank pressing cam 14, just can reach the utility model discloses a purpose, and realize the utility model discloses anticipated effect.

5. In the above embodiment, the first stretching force F1 corresponds to the first punch driving mechanism, the first hold-down force F3 corresponds to the first hold-down mechanism, and the first punch driving mechanism and the first hold-down mechanism act on the same can blank to be stretched. The second stretching force F2 corresponds to a second punch driving mechanism, the second blank pressing force F4 corresponds to a second blank pressing mechanism, and the second punch driving mechanism and the second blank pressing mechanism act on the other same drawn can blank. However, the utility model discloses be not limited to this, can exchange first blank holder power F3 shown in FIG. 2 with second blank holder power F4, will correspond first blank holder mechanism and second jumper bar actuating mechanism of first blank holder power F3 promptly and form a complete set, will correspond second blank holder mechanism and first jumper bar actuating mechanism of second blank holder power F4 simultaneously and form a complete set.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (5)

1. The utility model provides a balanced two-way pair of jar body stretcher of high speed, includes jumper bar actuating mechanism, its characterized in that: the punch driving mechanism is formed by connecting the following components:

a crankshaft (1), the crankshaft (1) is rotatably supported by bearings, the crankshaft (1) is provided with a first crank throw (11) and a second crank throw (12), wherein, on a plane passing through the axis of the crankshaft (1), the first crank throw (11) and the second crank throw (12) are oppositely bent;

two links (2), a first link (21) and a second link (22);

two slide rails (3), namely a first slide rail (31) and a second slide rail (32);

two sliders (4), namely a first slider (41) and a second slider (42);

two punches (5), a first punch (51) and a second punch (52);

wherein:

the first crank throw (11) is rotatably connected with one end of a first connecting rod (21), the other end of the first connecting rod (21) is rotatably connected with a first sliding block (41), the first sliding block (41) is installed on a first sliding rail (31) and is in sliding connection relative to the first sliding rail (31), the first sliding rail (31) is fixed relative to a machine base of the tank body stretcher, and the first sliding block (41) is fixedly connected with a first punch rod (51);

the second crank throw (12) is rotatably connected with one end of a second connecting rod (22), the other end of the second connecting rod (22) is rotatably connected with a second sliding block (42), the second sliding block (42) is installed on a second sliding rail (32) and is in sliding connection relative to the second sliding rail (32), the second sliding rail (32) is fixed relative to a machine base of the tank body stretcher, and the second sliding block (42) is fixedly connected with a second punch rod (52);

the first crank throw (11), the first connecting rod (21), the first sliding block (41), the first sliding rail (31) and the first plunger (51) are positioned at one end side of the crankshaft (1) and form a first plunger driving mechanism; the second crank throw (12), the second connecting rod (22), the second sliding block (42), the second sliding rail (32) and the second plunger (52) are positioned at the other end side of the crankshaft (1) and form a second plunger driving mechanism;

on a plane which is transverse to the axis of the crankshaft (1), the first punch driving mechanism and the second punch driving mechanism are symmetrically arranged by taking the rotation center point of the crankshaft (1) as a reference.

2. The can body stretcher of claim 1, wherein: the first connecting rod (21) and the second connecting rod (22) are the same in shape and size.

3. The can body stretcher of claim 1, wherein: the first slide rail (31) and the second slide rail (32) are the same in shape and size.

4. The can body stretcher of claim 1, wherein: the first slider (41) and the second slider (42) are the same in shape and size.

5. The can body stretcher of claim 1, wherein: the first punch (51) and the second punch (52) are identical in shape and size.

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