CN108746742B - Rocking arm perforating device shifts - Google Patents

Abstract

The invention relates to the field of automobile part processing, and discloses a punching device for a gear shifting rotary arm, which comprises a rack, wherein a motor is connected to the rack in a sliding manner, an output shaft of the motor is coaxially connected with a driving gear and a drill bit, the driving gear is engaged with a driven gear, the driven gear is rotationally connected to the rack, the end surface of the driven gear is eccentrically and rotationally connected with a first connecting rod, the other end of the first connecting rod is rotationally connected with a second connecting rod, the second connecting rod is rotationally connected with a swing rod, and the other end of the swing rod is rotationally connected with; the second connecting rod is connected with a first piston rod in a rotating mode, the first piston rod is connected with a first air cylinder in a sliding mode, a liquid inlet of the first air cylinder is communicated with a liquid tank, and a liquid outlet of the first air cylinder is communicated with the second air cylinder. This scheme is through setting up five link mechanism and two cylinders, converts the idle running before the drilling of drill bit into the linear motion of briquetting to the realization has practiced thrift fixed clamping mechanism's assist time with dismantling to the fixed of work piece, has improved production efficiency.

Description

Rocking arm perforating device shifts

Technical Field

The invention relates to the field of automobile part processing, in particular to a punching device.

Background

The gear shifting rotary arm structure is an important component of an automobile transmission and is mainly used for an automobile steering system and an automobile gear accelerating system; the existing gear shifting rotary arm structure consists of three parts, namely a gear shifting rotary arm, a gear shifting pull lock pin and a gear shifting limiting pin. The whole gear shifting rotating arm is a flat plate, one end of the gear shifting rotating arm is provided with a gear shifting inhaul cable pin through hole, and a gear shifting zipper pin is arranged in the gear shifting zipper pin through hole; the other end of the gear shifting rotary arm is provided with a gear shifting limiting pin through hole, the gear shifting limiting pin is arranged in the gear shifting limiting pin through hole, and the gear shifting rotary arm is also provided with a mounting hole of the gear shifting rotary arm structure assembly. That is, several holes are provided on the shift rocker arm for assembly.

In the prior art, when a workpiece is punched, a fixing mode is generally adopted as follows: the workbench is provided with a plurality of dovetail grooves, bolts are connected in the dovetail grooves in a sliding mode, pressing blocks are sleeved on the bolts, locking nuts are connected on the bolts in a threaded mode, and the pressing blocks are located between the bolt heads and the locking nuts. When punching, a workpiece is placed on the workbench, the bolt slides in the dovetail groove, the pressing block on the bolt is positioned on the workpiece, and then the locking nut is rotated to enable the pressing block to tightly press the workpiece, so that the workpiece is fixed. All need artifical adjusting bolt, briquetting and lock nut in order to realize fixed to the work piece before drilling, need the manual work to untie fixed to the work piece after accomplishing drilling, the operation is comparatively loaded down with trivial details, has increased the part before drilling, the back assist time, and production efficiency is low.

Disclosure of Invention

The invention aims to provide a perforating device for a gear shifting rotating arm, which can automatically fix a workpiece before drilling the gear shifting rotating arm (hereinafter referred to as a workpiece), can unlock the workpiece after drilling without disassembling a clamping mechanism, reduces the auxiliary time and improves the production efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme: a shifting rotary arm punching device comprises a rack, wherein a workbench is fixedly arranged on the rack, a motor is connected onto the rack in a sliding manner, an output shaft of the motor is perpendicular to the workbench, and a drill bit is coaxially connected onto the output shaft of the motor; the automatic feeding device is characterized by further comprising a first cylinder sleeve and a second cylinder sleeve which are fixedly arranged on the rack, a driving gear is coaxially connected to an output shaft of the motor, the driving gear is meshed with a driven gear, the driven gear is rotatably connected to the rack, the end face of the driven gear is eccentrically and rotatably connected with a first connecting rod, the other end of the first connecting rod is rotatably connected with a second connecting rod, the second connecting rod is rotatably connected with a swing rod, and the other end of the swing rod is rotatably connected with the rack; a first piston head is connected in the first cylinder sleeve in a sliding manner, a first liquid cavity is formed by the first piston head and the upper part of the first cylinder sleeve, a first piston rod is fixedly connected to the first piston head, and the other end of the first piston rod is rotatably connected with a second connecting rod; the first liquid cavity is communicated with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with a liquid tank, a liquid inlet one-way valve is arranged on the liquid inlet pipe, and a liquid outlet one-way valve is arranged on the liquid outlet pipe; the second cylinder sleeve is internally and slidably connected with a second piston head, the second piston head and the second cylinder sleeve form a second air cavity and a second liquid cavity, a second piston rod is fixedly connected to the second piston head, the other end of the second piston rod extends out of the second cylinder sleeve through the bottom of the second air cavity, the second piston rod extends out of a pressing block of a fixed workpiece fixedly connected with one end of the second cylinder sleeve, the second liquid cavity is communicated with the first liquid cavity through a liquid outlet pipe, the second liquid cavity is communicated with a return pipe, the return pipe is communicated with the liquid tank, and the return pipe is connected with a second switch valve.

The principle and the advantages of the scheme are as follows: the workbench is used for placing a workpiece; the drill bit is coaxially connected with the output of the motor, and the drill bit rotates along with the motor to drill a workpiece; the liquid tank is used for storing liquid. The liquid inlet one-way valve and the liquid outlet one-way valve are arranged, so that liquid can only enter the first liquid cavity from the liquid inlet pipe and is discharged from the liquid outlet pipe. When the drill bit idles, the driving gear is meshed with the driven gear, the driving gear drives the driven gear to rotate, and the driven gear rotates to drive the first connecting rod, the second connecting rod and the oscillating rod to reciprocate, so that the first piston rod reciprocates. When the motor drives the drill bit to move for drilling, the driving gear is separated from the driven gear, the driven gear stops rotating, and the first piston rod stops reciprocating. The first piston rod is fixedly connected with the first piston head, and the first piston head reciprocates in the first cylinder sleeve, so that liquid in the liquid tank is sucked into the first liquid cavity and then is discharged into the second liquid cavity; when liquid in the second liquid cavity is increased gradually, the volume of the second liquid cavity is increased, and the second piston head is pushed to slide in the second cylinder sleeve towards the direction close to the workpiece. When the drill bit idles, the gas in the second gas cavity is compressed, and after drilling is finished, the compressed gas in the second gas cavity expands in volume to push the second piston head to move, so that the liquid in the second liquid cavity is discharged into the liquid tank. The second piston rod is used for connecting the second piston head with the pressing block, so that the pressing block moves along with the second piston head, the pressing block abuts against the workpiece, and the workpiece is fixed. And after drilling is finished, the return pipe is used for discharging the liquid in the second liquid cavity into the liquid tank, and the pressing block is unlocked to fix the workpiece. The second switch valve is used for opening or closing the return pipe, so that the second liquid cavity is communicated or not communicated with the liquid tank.

When the scheme is adopted, the idle rotation before the drill bit reaches the set rotating speed is converted into the linear motion of the pressing block, so that the pressing block compresses and fixes the workpiece; during drilling, the driving gear is not meshed with the driven gear, the driven gear stops moving, the pressing block also stops moving to continuously fix the workpiece, and the pressing block does not utilize mechanical energy of the motor during drilling and does not increase load of the motor; and after drilling is finished, opening the second switch valve, discharging the liquid in the second liquid cavity into the liquid tank, and releasing the fixation of the workpiece. Compared with the prior art that the workpiece is fixed and released fixedly by manually adjusting the clamping mechanism, the scheme does not need to manually adjust the clamping mechanism, can automatically clamp the workpiece to be drilled, and can release the fixation of the workpiece by manually opening the second switch valve after the drilling is completed. The scheme is simple to operate, saves the auxiliary time for fixing and disassembling the clamping mechanism, and improves the production efficiency.

Furthermore, the upper end of each tooth of the driving gear is provided with a first bulge, and the section of each first bulge is in an upright triangle shape; the lower end of each tooth of the driven gear is provided with a second bulge, and the section of each second bulge is an inverted triangle.

After the drilling is completed, the drill bit stops rotating, the driving gear moves upwards along with the drill bit, the first protrusion and the second protrusion play a guiding role, the driving gear and the driven gear are convenient to re-engage, the gear teeth of the driving gear are prevented from being blocked by the lower ends of the upper teeth of the driven gear, and the driving gear can be re-engaged after being manually shifted.

Further, the second liquid cavity is communicated with an overflow pipe, the overflow pipe is communicated with the liquid tank, and the overflow pipe is connected with an overflow valve. The overflow valve can stabilize the liquid pressure in the second liquid cavity, discharge redundant liquid into the liquid tank, and prevent the second cylinder sleeve, the second piston head, the second piston rod and the like from being damaged due to overlarge pressure.

Further, a first air cavity is formed by the first piston head and the lower portion of the first cylinder sleeve, an air inlet and an air outlet are formed in the first air cavity, the air inlet is connected with an air inlet one-way valve, the air outlet is communicated with a hose, an air outlet one-way valve is connected to the hose, the hose is communicated with an air bag fixedly connected to the rack, an air outlet is also formed in the air bag, the air outlet of the air bag is communicated with an air pipe, and a first switch valve is connected to the air pipe.

When first piston rod reciprocating motion made first liquid chamber imbibition, flowing back, first air cavity volume correspondingly diminishes, the grow, realizes exhausting, inhales to store in filling the gasbag with external gas, need not additionally to increase the power supply. After the drilling work is finished, the first switch valve is opened, the gas in the air bag is discharged from the air pipe, and slag left after the drilling on the workpiece is blown away to clean the workpiece; and simultaneously cooling the workpiece.

Furthermore, a pressure spring is sleeved on the second piston rod, one end of the pressure spring is fixedly connected to the piston head, and the other end of the pressure spring is fixedly connected to the bottom of the first air cavity.

Through setting up the pressure spring, when the second piston rod caused the sealed department of being connected of second piston rod and the bottom of second air cavity to lose efficacy because of reciprocating motion, the gas in the second air cavity was discharged, can't promote the second piston head motion through the compressed gas in the second air cavity, and the pressure spring of compressed this moment resumes, can make the second piston head motion and discharge the liquid in the second liquid chamber to the liquid tank in through the back flow, improves the reliability of device.

Furthermore, a protective pad is fixedly arranged below the pressing block. When the pressing block compresses the workpiece to be fixed, the protective pad can prevent the pressing block from crushing the workpiece.

Further, a first handle for opening or closing the first switch valve is rotatably connected to the first switch valve, and a second handle for opening or closing the second switch valve is rotatably connected to the second switch valve. Thereby, it is convenient for the worker to open or close the development valve by turning the handle.

Furthermore, the first in command and the second in command are arranged in parallel, the tail of the second in command is rotatably connected with a connecting rod through a pin shaft, and the other end of the connecting rod is also rotatably connected with the tail of the first in command through a pin shaft. Therefore, the first switch valve and the second switch valve can be opened or closed simultaneously through one operation, two operations are not needed, and the operation is more convenient.

The upper and lower directions of the above expression orientation represent only relative positional relationships, and do not represent absolute positional relationships.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a view from direction B of fig. 1.

Fig. 3 is a sectional view a-a in fig. 1.

Detailed Description

The present invention will be described in further detail below by way of specific embodiments:

reference numerals in the drawings of the specification include: the hydraulic control device comprises a workbench 1, a motor 11, a connecting shaft 12, a drill 13, a driving gear 21, a first protrusion 211, a driven gear 22, a second protrusion 221, a first connecting rod 23, a second connecting rod 24, a swing rod 25, a first piston rod 26, a first cylinder sleeve 31, a first piston head 32, an air inlet one-way valve 33, a hose 34, an air outlet one-way valve 341, a liquid outlet pipe 35, a liquid outlet one-way valve 351, a liquid inlet pipe 36, a liquid inlet one-way valve 361, a first air cavity 37, a first liquid cavity 38, an air bag 4, an air pipe 41, a first switch valve 42, a first handle 421, a connecting rod 43, a second cylinder sleeve 51, a second piston head 52, a second piston rod 53, a pressure spring 531, a pressure block 54, a protective pad 541, a second switch valve 55, a second handle, a return pipe 552, an overflow pipe 56, an overflow valve 561, a second air cavity 57, a.

The embodiment is basically as shown in figure 1: the utility model provides a rocking arm perforating device shifts, includes workstation 1 that frame and level set up, and 1 welding of workstation has motor 11 in the frame, and vertical sliding connection has motor 11 in the frame, and coaxial coupling has connecting axle 12 on motor 11's the output shaft, and connecting axle 12 sets up perpendicular to workstation 1, and connecting axle 12 coaxial coupling has drill bit 13, and the concrete connected mode of drill bit 13 is: the connecting shaft 12 is provided with a clamping portion, and the drill bit 13 is provided with a clamping groove matched with the clamping portion on the connecting shaft 12. The connecting shaft 12 is coaxially connected with a driving gear 21 through a key, the connecting shaft 12 is also provided with two grooves, check rings are clamped in the grooves, and the driving gear 21 abuts against the two check rings; the two retainer rings circumferentially position the driving gear 21 to prevent the driving gear 21 from moving on the connecting shaft 12. The driving gear 21 is engaged with a driven gear 22, and the driven gear 22 is rotatably connected with the frame through a rotating shaft. As can be seen from fig. 3, a first protrusion 211 is welded to an upper end of each tooth of the driving gear 21, and a cross section of the first protrusion 211 is an upright triangle; a second projection 221 is welded to the lower end of each tooth of the driven gear 22, and the section of the second projection 221 is an inverted triangle. When drilling, the driving gear 21 moves downwards along with the drill bit 13, the driven gear 22 is disengaged from the driving gear 21 and is not meshed with the driving gear, and the driven gear 22 stops rotating; after drilling is completed, the drill bit 13 stops rotating, the driving gear 21 moves upwards along with the drill bit 13, the first protrusion 211 and the second protrusion 221 play a guiding role, the driving gear 21 and the driven gear 22 are convenient to re-engage, the situation that the teeth of the driving gear 21 are blocked by the lower ends of the teeth on the driven gear 22 and can be re-engaged only by manual shifting is avoided.

As can be seen from fig. 2, the end face of the driven gear 22 is eccentrically and rotatably connected to a first connecting rod 23 through a pin, the other end of the first connecting rod 23 is also rotatably connected to a second connecting rod 24 through a pin, the other end of the second connecting rod 24 is also rotatably connected to a swing rod 25 through a pin, and the other end of the swing rod 25 is rotatably connected to the frame; the middle part of the second connecting rod 24 is rotatably connected with a first piston rod 26, the other end of the first piston rod 26 is connected with a first piston head 32 through a bolt, and the first connecting rod 23, the swing rod 25 and the first piston rod 26 are all positioned on the same side of the second connecting rod 24; the first piston head 32 is connected with a first cylinder sleeve 31 fixed on the frame in a sliding manner, and the first cylinder sleeve 31 is divided into a first air cavity 37 and a first liquid cavity 38 by the first piston head 32; first air cavity 37 bottom is equipped with air inlet and gas outlet, the air inlet is connected with air inlet check valve 33, the gas outlet intercommunication has hose 34, be connected with the check valve 341 of giving vent to anger on the hose 34, hose 34 intercommunication has fixed connection the gasbag 4 in the frame, it also has the gas outlet to establish on the gasbag 4, gasbag 4 gas outlet intercommunication has trachea 41, be connected with first ooff valve 42 on the trachea 41, first ooff valve 42 passes through bolted connection in the frame, it is connected with the first in command 421 that opens or close first ooff valve 42 to rotate on the first ooff valve 42, the vertical setting of the first in command 421.

The bottom of the first liquid cavity 38 is communicated with a liquid inlet pipe 36 and a liquid outlet pipe 35, the liquid inlet pipe 36 is provided with a liquid inlet one-way valve 361, and the liquid inlet pipe 36 is communicated with a liquid tank 6 fixedly arranged on the frame; as can be seen from fig. 1, the liquid outlet pipe 35 is connected to the second cylinder sleeve 51, the second piston head 52 is slidably connected to the second cylinder sleeve 51, the second cylinder sleeve 51 is divided into a second air cavity 57 and a second liquid cavity 58 by the second piston head 52, and the second liquid cavity 58 is communicated with the liquid outlet pipe 35 on the first liquid cavity 38; the second liquid cavity 58 is communicated with an overflow pipe 56 and a return pipe 552, and the overflow pipe 56 and the return pipe 552 are both communicated with the liquid tank 6; a relief valve 561 is connected to the overflow pipe 56, and the relief valve 561 stabilizes the liquid pressure in the second liquid chamber 58, discharges the excess liquid to the tank 6, and prevents the second cylinder liner 51, the second piston head 52, the second piston rod 53, and the like from being damaged by excessive pressure. The return pipe 552 is connected with a second switch valve 55, the second switch valve 55 is connected to the frame through a bolt, the second switch valve 55 is rotatably connected with a second handle 551 which opens or closes the second switch valve 55, the second handle 551 is also vertically arranged, the tail part of the second handle 551 is rotatably connected with a connecting rod 43 through a pin shaft, and the other end of the connecting rod 43 is also rotatably connected with the tail part of the first handle 421 through a pin shaft. The second piston head 52 is connected with a second piston rod 53 through a bolt, the other end of the second piston rod 53 extends out of the second cylinder sleeve 51 through the bottom of the second air cavity 57, one end of the second piston rod 53 extending out of the second cylinder sleeve 51 is connected with a press block 54 through a bolt, a protective pad 541 is bonded below the press block 54, the protective pad 541 is a cloth tape, a rubber pad or a nylon pad, and when the press block 54 presses and fixes a workpiece, the protective pad 541 can prevent the press block 54 from pressing and damaging the workpiece; a compression spring 531 is sleeved on the second piston rod 53, one end of the compression spring 531 is welded on the piston head, and the other end of the compression spring 531 is welded at the bottom of the second air cavity 57.

The implementation process is as follows: initially, there is no gas in the airbag 4. A workpiece is placed on the workbench 1, the drill bit 13 needs to idle for a period of time before drilling, and the drilling operation is started after the rotating speed of the drill bit 13 reaches a set value. As can be seen from fig. 2, since the first connecting rod 23 is eccentrically and rotatably connected to the end surface of the driven gear 22, the first connecting rod 23 reciprocates along with the rotation of the driven gear 22, the second connecting rod 24 reciprocates along with the first connecting rod 23, the swing rod 25 reciprocates along with the second connecting rod 24, and the first piston rod 26 reciprocates up and down along with the movement of the first connecting rod 23, the second connecting rod 24, and the swing rod 25. When the first piston rod 26 moves upwards, the gas in the first gas cavity 37 is discharged into the gas bag 4, and the liquid in the liquid tank 6 is sucked into the first liquid cavity 38; when the first piston rod 26 moves downwards, the external air is sucked into the first air cavity 37, and meanwhile, the liquid in the liquid tank 6 is discharged into the second liquid cavity 58; the first piston rod 26 reciprocates, and the first air cavity 37 reciprocates to suck the outside air and then discharge the outside air to the air bag 4 for storage; meanwhile, the first liquid cavity 38 absorbs liquid from the liquid tank 6 in a reciprocating manner and then discharges the liquid into the second liquid cavity 58, the liquid in the second liquid cavity 58 is increased, the volume of the second liquid cavity 58 is gradually increased, the second piston head 52 is pushed to compress the compression spring 531 to move downwards, the second piston head 52 enables the second piston rod 53 to move downwards, the press block 54 is driven to move downwards, and the protection pad 541 on the press block 54 is abutted against a workpiece, so that the workpiece is pressed. When the height of the workpiece is higher, the distance for descending the pressing block 54 is smaller, and the liquid in the second liquid cavity 58 is less; when the protective pad 541 abuts against the workpiece, the pressure of the second liquid chamber 58 is increased after the excessive liquid enters the second liquid chamber 58, when the pressure reaches the set value of the overflow valve 561 on the overflow pipe 56, the overflow valve 561 is opened, the excessive liquid in the second liquid chamber 58 is discharged to the liquid tank 6 through the overflow pipe 56 until no liquid is discharged from the first liquid chamber 38 to the second liquid chamber 58, and the overflow valve 561 is closed.

When the drill bit 13 reaches the set rotating speed, the motor 11 moves downwards, the drill bit 13 moves downwards through the connecting shaft 12 to drill a workpiece, meanwhile, the driving gear 21 moves downwards along with the connecting shaft 12 to be separated from the driven gear 22, the driven gear 22 stops rotating, and the first piston rod 26 stops moving. First piston rod 26 stops moving, air in air bag 4 stops inflating, first liquid chamber 38 stops sucking liquid and discharges liquid into second liquid chamber 58; the second piston rod 53 stops moving, the pressing block 54 stops moving, and the pressing block 54 still presses the workpiece, so that the drill 13 can conveniently drill the workpiece. After the drill bit 13 finishes drilling, the motor 11 is turned off, the drill bit 13 stops rotating, the motor 11 moves upwards, the drill bit 13 moves upwards through the connecting shaft 12, the driving gear 21 also moves upwards through the connecting shaft 12, when the driving gear 21 moves to the lower end of the driven gear 22, as the driving gear 21 is provided with the first protrusion 211, the driven gear 22 is provided with the second protrusion 221, under the guiding action of the first protrusion 211 and the second protrusion 221, the driving gear 21 and the driven gear 22 are meshed again to recover the initial state, and the next drilling operation is waited. When the drill 13 moves upward away from the workpiece, the connecting rod 43 is pulled obliquely downward, and since the first handle 421 and the second handle 551 are both rotatably connected to the connecting rod 43, the first handle 421 and the second handle 551 rotate counterclockwise to open the first switching valve 42 and the second switching valve 55. The first switch valve 42 is opened, the gas in the air bag 4 is discharged from the gas pipe 41, and slag left after drilling on the workpiece is blown away to clean the workpiece; and simultaneously cooling the workpiece. The second switching valve 55 is opened, the second liquid chamber 58 communicates with the liquid tank 6, and the compressed compression spring 531 is restored to push the second piston head 52 upward, thereby discharging the liquid in the second liquid chamber 58 to the liquid tank 6 through the return pipe 552. Then, the connection rod 43 is pulled obliquely upward, and the first and second handles 421 and 551 rotate clockwise to close the first and second switching valves 42 and 55.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (8)

1. A shifting rotary arm punching device comprises a rack, wherein a workbench is fixedly arranged on the rack, a motor is connected onto the rack in a sliding manner, an output shaft of the motor is perpendicular to the workbench, and a drill bit is coaxially connected onto the output shaft of the motor; the method is characterized in that: the automatic feeding device is characterized by further comprising a first cylinder sleeve and a second cylinder sleeve which are fixedly arranged on the rack, a driving gear is coaxially connected to an output shaft of the motor, the driving gear is meshed with a driven gear, the driven gear is rotatably connected to the rack, the end face of the driven gear is eccentrically and rotatably connected with a first connecting rod, the other end of the first connecting rod is rotatably connected with a second connecting rod, the second connecting rod is rotatably connected with a swing rod, and the other end of the swing rod is rotatably connected with the rack; a first piston head is connected in the first cylinder sleeve in a sliding manner, a first liquid cavity is formed by the first piston head and the lower part of the first cylinder sleeve, a first piston rod is fixedly connected to the first piston head, and the other end of the first piston rod is rotatably connected with the second connecting rod; the first liquid cavity is communicated with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with a liquid tank, a liquid inlet one-way valve is arranged on the liquid inlet pipe, and a liquid outlet one-way valve is arranged on the liquid outlet pipe; the second piston head is connected with the second cylinder sleeve in a sliding mode, the second piston head and the second cylinder sleeve form a second air cavity and a second liquid cavity, a second piston rod is fixedly connected to the second piston head, the other end of the second piston rod extends out of the second cylinder sleeve through the bottom of the second air cavity, a pressing block of a fixed workpiece is fixedly connected to one end, extending out of the second cylinder sleeve, of the second piston rod, the second liquid cavity is communicated with the first liquid cavity through a liquid outlet pipe, the second liquid cavity is communicated with a return pipe, the return pipe is communicated with the liquid tank, and a second switch valve is connected to the return pipe.

2. A shifting tumbler punching device according to claim 1, characterized in that: the upper end of each tooth of the driving gear is provided with a first bulge, and the section of each first bulge is an upright triangle; the lower end of each tooth of the driven gear is provided with a second bulge, and the section of each second bulge is an inverted triangle.

3. A shifting tumbler punching device according to claim 2, characterized in that: the second liquid cavity is communicated with an overflow pipe, the overflow pipe is communicated with the liquid tank, and the overflow pipe is connected with an overflow valve.

4. A shifting tumbler punching device according to claim 3, characterized in that: the first piston head and the lower portion of the first cylinder sleeve form a first air cavity, an air inlet and an air outlet are arranged on the first air cavity, the air inlet is connected with an air inlet one-way valve, the air outlet is communicated with a hose, an air outlet one-way valve is connected onto the hose, the hose is communicated with an air bag fixedly connected onto the rack, an air outlet is also arranged on the air bag, the air outlet of the air bag is communicated with an air pipe, and a first switch valve is connected onto the air pipe.

5. A shifting tumbler punching device according to claim 4, characterized in that: a pressure spring is sleeved on the second piston rod, one end of the pressure spring is fixedly connected to the piston head, and the other end of the pressure spring is fixedly connected to the bottom of the first air cavity.

6. A shifting tumbler punching device according to any one of claims 4 and 5, characterized in that: and a protective pad is fixedly arranged below the pressing block.

7. A shifting tumbler punching device according to claim 6, characterized in that: the first switch valve is connected with a first handle for opening or closing the first switch valve in a rotating mode, and the second switch valve is connected with a second handle for opening or closing the second switch valve in a rotating mode.

8. A shifting tumbler punching device according to claim 7, characterized in that: the first handle and the second handle are arranged in parallel, the tail of the second handle is rotatably connected with a connecting rod through a pin shaft, and the other end of the connecting rod is also rotatably connected with the tail of the first handle through a pin shaft.

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