CN218088143U

CN218088143U - Pre-reel-changing device of winding shaft

Info

Publication number: CN218088143U
Application number: CN202222607721.1U
Authority: CN
Inventors: 张梓龙; 王晓轩; 黄育鹏; 刘奇; 王有德; 黄文林
Original assignee: Guangdong Shanzhang Light Industry Co ltd
Current assignee: Guangdong Shanzhang Light Industry Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-20
Anticipated expiration: 2032-09-30

Abstract

The utility model discloses a pre-changing device of a winding shaft, which comprises a frame, a winding shaft fixing mechanism, a hoisting mechanism, a cross cutting knife detection mechanism and a control device, wherein the winding shaft fixing mechanism is arranged on the frame and comprises a first swing driving mechanism, two supporting arms and two top shaft clamping shaft mechanisms; and the signal output end of the transverse cutter detection mechanism is electrically connected with the signal input end of the control device. The pre-roll changing device can send a new rolling shaft to be rolled to a preparation position in advance, and timely carries out contact rolling on the new rolling shaft and the friction roller after an old rolling shaft which finishes rolling is subjected to film cutting.

Description

Pre-reel-changing device of winding shaft

Technical Field

The utility model relates to a rolling equipment, in particular to roll changing device in advance of rolling axle.

Background

The winding machine is a common mechanical device in industrial production, and generally comprises a friction winding machine and a central winding machine, wherein the friction winding machine drives a winding shaft to rotate through a friction roller, so that a film is wound and applied to scenes that the film is thick and a material roll is heavy after winding. When a friction type winding machine is adopted for winding, the winding shaft and the friction roller are required to be kept in close contact, and the film material can be smoothly wound on the winding shaft. If the publication number is CN214989055U, the Chinese patent published as 2021, 12 and 3 discloses an automatic coil changing and unloading device, the automatic coil changing and unloading device is provided with a first swing frame, a first swing mechanism and two jacking and positioning devices, the first swing frame can drive the first swing frame to swing up and down around the axis of the first swing frame, the first swing frame is provided with two first supporting arms which are arranged side by side from left to right, the two first supporting arms are respectively positioned at the left side and the right side of a winding roll, the upper end face of each first supporting arm is provided with a first mounting groove, and the positions of the two first mounting grooves are corresponding; the jacking and positioning device comprises an upper jacking cylinder, an upper jacking block, a lower pressing cylinder and a lower pressing block, wherein the cylinder body of the upper jacking cylinder is arranged on the first supporting arm and moves up and down, and the upper jacking block is arranged at the bottom of the first mounting groove and is connected with a piston rod of the upper jacking cylinder; the cylinder body of the lower pressing cylinder is hinged to the first supporting arm, the first end portion of the lower pressing block is hinged to the piston rod of the lower pressing cylinder, the middle portion of the lower pressing block is hinged to the first supporting arm, and the second end portion of the lower pressing block corresponds to the notch of the first mounting groove. When the automatic coil changing and unloading device works, two ends of a new winding shaft to be wound can be placed in the first mounting grooves respectively in advance, and the new winding shaft is contacted with the friction roller after the old winding shaft which finishes winding is cut off, so that a new winding round is started. However, the automatic coil changing and unloading device is difficult to grasp and timely carries out contact winding on a new winding shaft and the friction roller after being cut off, and the upper jacking cylinder and the lower pressing cylinder are controlled after manual observation, so that errors are easy to occur; meanwhile, a new winding shaft is manually conveyed, and two ends of the new winding shaft are respectively placed in the first mounting grooves.

Disclosure of Invention

The utility model aims to solve the technical problem that a roll changing device in advance of rolling axle is provided, this kind of roll changing device in advance can will treat the new rolling axle of rolling and send to the preparation position to in time carry out the contact rolling with new rolling axle and friction roller after the old rolling axle of accomplishing the rolling carries out the membrane material and cuts off.

In order to solve the technical problems, the technical scheme is as follows:

a pre-reel-changing device of a winding shaft comprises a rack, a winding shaft fixing mechanism and a control device, wherein the winding shaft fixing mechanism is installed on the rack and comprises a first swing driving mechanism, two supporting arms and two top shaft clamping shaft mechanisms, the first swing driving mechanism is installed on the rack, the upper end faces of the two supporting arms are provided with placing grooves, the lower ends of the two supporting arms are respectively hinged with the rack, the two top shaft clamping shaft mechanisms correspond to the two supporting arms one by one, and the top shaft clamping shaft mechanisms are installed on the supporting arms and correspond to the positions of the placing grooves; the signal input ends of the first swing driving mechanism and the top shaft clamping mechanism are respectively and electrically connected with the corresponding signal output ends of the control device; the method is characterized in that: the roll pre-changing device further comprises a lifting mechanism and a transverse cutter detection mechanism, the lifting mechanism and the transverse cutter detection mechanism are respectively installed on the rack, the signal output end of the transverse cutter detection mechanism is electrically connected with the signal input end of the control device, and the signal input ends of the transverse cutter detection mechanism and the lifting mechanism are respectively electrically connected with the signal output ends corresponding to the control device.

In the roll pre-changing device, the position of the installation of the transverse cutter detection mechanism is matched with the position of the transverse cutter in the friction type rolling machine, and the transverse cutter detection mechanism is used for detecting whether the transverse cutter finishes the cutting-off work of the film material. When an old winding shaft is in close contact with the friction roller for winding, the hoisting mechanism hoists a new winding shaft to be wound and transfers the new winding shaft to the upper part of the supporting arm, then the new winding shaft is lowered down, so that two ends of the new winding shaft are respectively positioned in the placing grooves, and at the moment, the top shaft clamping mechanism jacks up two ends of the new winding shaft, so that the new winding shaft cannot be in contact with the friction roller; after the rolling of the old rolling shaft is finished, the transverse cutter cuts off the film material, the transverse cutter detection mechanism sends a signal to the control device after detecting that the transverse cutter cuts off the film material, and the control device controls the top shaft clamping mechanism to act, so that the top shaft clamping mechanism does not jack up the new rolling shaft and presses down the new rolling shaft from the opening of the placing groove, and the new rolling shaft is clamped by matching with the groove wall of the placing groove, and the new rolling shaft is tightly attached to the friction roller through the film material; then the first swing driving mechanism drives the supporting arm to swing, a new winding shaft moves downwards along the periphery of the friction roller from the upper part of the friction roller until the new winding shaft is placed on a horizontal sliding rail of the friction type winding machine, the new winding shaft is limited by a clinging device of the friction type winding machine, and the new winding shaft is loosened by the shaft jacking and clamping mechanism; when the new winding shaft is wound to a certain thickness, the end part of the new winding shaft is separated from the placing groove, the first swing driving mechanism drives the supporting arm to swing upwards again, the supporting arm returns to the state that the opening of the placing groove faces upwards again, and at the moment, the hoisting mechanism can place a new winding reel to be wound into the placing groove and circulate in sequence. The pre-roll-changing device can convey a new rolling shaft to be rolled to a preparation position in advance, and the new rolling shaft is put down in time after the old rolling shaft is cut off film materials, so that the new rolling shaft can be rolled, and meanwhile, a lifting device is arranged to enable the new rolling shaft to be placed without manual operation.

In a preferable scheme, the transverse cutter detection mechanism adopts a first proximity switch, the first proximity switch is installed on the rack, and a signal output end of the first proximity switch is electrically connected with a signal input end corresponding to the control device. Generally, a transverse cutter of a friction type winding machine adopts a blade and a rodless cylinder capable of driving the blade to translate, a cylinder body of the rodless cylinder is installed on a rack and arranged along the left-right direction, the blade is installed on a sliding block of the rodless cylinder, and an induction end of a first proximity switch is aligned to the end part of the rodless cylinder; when the film material is cut, the blade is driven by the rodless cylinder to translate, and when the blade translates to the end part of the rodless cylinder, the first proximity switch senses the blade and responds to the blade, and sends a signal to the control device.

In a preferred scheme, the first swing driving mechanism comprises a rotating shaft, a servo motor, a driving gear and a driven gear, the rotating shaft is rotatably arranged on the rack and arranged along the left-right direction, and the lower ends of the two supporting arms are respectively connected with the two ends of the rotating shaft; the servo motor is arranged on the rack, and the signal input end of the servo motor is electrically connected with the corresponding signal output end of the control device; the driving gear is installed on servo motor's output shaft, and driven gear installs in the pivot to driven gear and driving gear mesh mutually. When the supporting arms need to swing, the control device sends a control signal to the servo motor, and the servo motor drives the driven gear to rotate through the driving gear, so that the rotating shaft drives the two supporting arms to swing synchronously.

In a further preferred embodiment, the first swing driving mechanism further includes a second proximity switch, a third proximity switch, a first detection body and a second detection body, the second proximity switch and the third proximity switch are respectively mounted on the rack, and signal output ends of the second proximity switch and the third proximity switch are respectively electrically connected with a signal input end of the control device; the first detection body and the second detection body are respectively installed on the rotating shaft, the first detection body corresponds to the detection end position of the second proximity switch, the second detection body corresponds to the detection end position of the third proximity switch, and a vertical line between the axes of the first detection body and the rotating shaft forms a 90-degree angle with a vertical line between the axes of the second detection body and the rotating shaft. When the supporting arm is in a vertical state, the positions of the detection ends of the first detection body and the second proximity switch correspond to each other, and the positions of the detection ends of the second detection body and the third proximity switch are staggered; when the supporting arm is in a horizontal state, the positions of the second detection body and the detection end of the third proximity switch correspond, and the positions of the first detection body and the detection end of the second proximity switch are staggered; by means of the arrangement, when the supporting arm swings, the control device can judge whether the supporting arm swings to the right position or not through whether the second proximity switch or the third proximity switch detects the corresponding detection body, and accordingly control starting and stopping of the servo motor (namely in the process that the supporting arm swings downwards, when the third proximity switch detects the second detection body, the supporting arm is in the horizontal state at the moment, the control device controls the servo motor to stop working), and in the process that the supporting arm swings upwards, when the second proximity switch detects the first detection body, the supporting arm is in the vertical state at the moment, the control device controls the servo motor to stop working).

In a further preferred embodiment, the driven gear is a quarter gear.

In a preferable scheme, each of the two top shaft clamping mechanisms comprises a first air cylinder, a second air cylinder and a downward pressing swinging block, the first air cylinders are mounted on the supporting arms and move up and down, and piston rods of the first air cylinders extend out of the placing grooves from the lower parts; the cylinder body of the second cylinder is hinged with the supporting arm, the piston rod of the second cylinder is hinged with the front end or the rear end of the lower pressing swinging block, the rear end or the front end of the lower part of the lower pressing swinging block is hinged with the supporting arm, and the lower pressing swinging block corresponds to the placing groove. When the new winding shaft is required not to be contacted with the friction roller, piston rods of the two first cylinders extend upwards into the placing groove, and two ends of the new winding shaft are jacked up; when a new winding shaft needs to be pressed down, the piston rod of the first cylinder retracts downwards, the two ends of the new winding shaft are in contact with the bottom of the placing groove, meanwhile, the piston rod of the second cylinder stretches out, the driving pressing swinging block swings to cover the opening of the placing groove, the new winding shaft is tightly pressed at the bottom of the placing groove, and when the supporting arm swings, the new winding shaft can always keep in a state of being in close contact with the friction roller, and the winding cannot be influenced.

In a further preferred scheme, the support arm is provided with an air cylinder installation cavity, the air cylinder installation cavity is communicated with the placing groove through a guide through hole which moves up and down, a cylinder body of the first air cylinder is installed in the air cylinder installation cavity, and a piston rod of the first air cylinder penetrates through the guide through hole and extends into the placing groove.

The control device usually adopts a microcomputer controller, and can also adopt a PID controller, a singlechip, a PLC controller, peripheral circuits thereof and the like. The hoisting mechanism can adopt a common hoisting machine, and the moving direction of the hoisting machine is the front-back direction.

The beneficial effects of the utility model reside in that: the pre-roll-changing device can convey a new rolling shaft to be rolled to a preparation position in advance, and the new rolling shaft is put down in time after the old rolling shaft is cut off film materials, so that the new rolling shaft can be rolled, and meanwhile, a lifting device is arranged to enable the new rolling shaft to be placed without manual operation.

Drawings

Fig. 1 is a schematic structural view of a roll pre-changing device in an embodiment of the present invention;

fig. 2 is a schematic structural view of a winding shaft fixing mechanism in the embodiment of the present invention;

fig. 3 is a schematic structural view of another angle of the winding shaft fixing mechanism in the embodiment of the present invention.

Detailed Description

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

a pre-reel-changing device of a winding reel as shown in fig. 1-3, comprising a frame 1, a winding reel fixing mechanism 2, a lifting mechanism 3, a cross-cutter detecting mechanism (not visible in the figure) and a control device (not visible in the figure), wherein the winding reel fixing mechanism 2, the lifting mechanism 3 and the cross-cutter detecting mechanism are respectively installed on the frame 1, the winding reel fixing mechanism 2 comprises a first swing driving mechanism 201 capable of driving the supporting arm 202 to swing, two supporting arms 202 and two top reel clamping shaft mechanisms 203, the first swing driving mechanism 201 is installed on the frame 1, the upper end surfaces of the two supporting arms 202 are provided with a placing groove 2021, the lower ends of the two supporting arms 202 are respectively hinged with the frame 1, the two top reel clamping shaft mechanisms 203 are in one-to-one correspondence with the two supporting arms 202, and the top reel clamping shaft mechanisms 203 are installed on the supporting arms 202 and correspond to the placing groove 2021; the signal output end of the transverse cutter detection mechanism is electrically connected with the signal input end of the control device, and the signal input ends of the transverse cutter detection mechanism, the lifting mechanism 3, the first swing driving mechanism 201 and the top shaft clamping mechanism 203 are respectively electrically connected with the corresponding signal output ends of the control device.

In the roll pre-changing device, the position of the installation of the transverse cutter detection mechanism is matched with the position of the transverse cutter in the friction type rolling machine, and the transverse cutter detection mechanism is used for detecting whether the transverse cutter finishes the cutting-off work of the film material. When the old winding shaft is in close contact with the friction roller for winding, the hoisting mechanism 3 hoists a new winding shaft to be wound and transfers the new winding shaft to the upper part of the supporting arm 202, then the new winding shaft is lowered down, so that two ends of the new winding shaft are respectively positioned in the placing grooves 2021, and at the moment, the top shaft clamping mechanism 203 jacks up two ends of the new winding shaft, so that the new winding shaft cannot be in contact with the friction roller; after the rolling of the old rolling shaft is finished, the transverse cutter cuts off the film material, the transverse cutter detection mechanism sends a signal to the control device after detecting that the transverse cutter is cut off, and the control device controls the top shaft clamping shaft mechanism 203 to act, so that the top shaft clamping shaft mechanism 203 does not jack up the new rolling shaft and presses down the new rolling shaft from the opening of the placing groove 2021, and the new rolling shaft is clamped by matching with the groove wall of the placing groove 2021, and the new rolling shaft is tightly attached to the friction roller through the film material; then, the first swing driving mechanism 201 drives the supporting arm 202 to swing, a new winding shaft moves downwards along the periphery of the friction roller from the upper part of the friction roller until the new winding shaft is placed on a horizontal sliding rail of the friction type winding machine, the new winding shaft is limited by a tight attaching device of the friction type winding machine, and the new winding shaft is loosened by the top shaft clamping shaft mechanism 203; when the new winding shaft is wound to a certain thickness and the end of the new winding shaft is separated from the placing groove 2021, the first swing driving mechanism 201 drives the supporting arm 202 to swing upwards again, so that the supporting arm 202 returns to the state that the opening of the placing groove 2021 faces upwards again, and at this time, the hoisting mechanism 3 can place a new winding shaft to be wound into the placing groove 2021 and circulate in sequence. The pre-roll-changing device can convey a new rolling shaft to be rolled to a preparation position in advance, and the new rolling shaft is put down in time after an old rolling shaft is cut off a film material, so that the new rolling shaft can be rolled, and meanwhile, a hoisting device is arranged to enable the new rolling shaft to be placed without manual operation.

The transverse cutter detection mechanism adopts a first proximity switch, the first proximity switch is installed on the rack 1, and the signal output end of the first proximity switch is electrically connected with the signal input end corresponding to the control device. A transverse cutter of the friction type winding machine adopts a blade 4 and a rodless cylinder 5 capable of driving the blade 4 to translate, a cylinder body of the rodless cylinder 5 is installed on a rack 1 and is arranged along the left-right direction, the blade 4 is installed on a sliding block of the rodless cylinder 5, and an induction end of a first proximity switch is aligned with the end part of the rodless cylinder 5; when the film material is cut, the blade 4 is driven by the rodless cylinder 5 to translate, when the blade 4 translates to the end part of the rodless cylinder 5, the first proximity switch senses the blade 4 and responds, and a signal is sent to the control device.

The first swing driving mechanism 201 comprises a rotating shaft 2011, a servo motor (not visible in the figure), a driving gear 2012 and a driven gear 2013, the rotating shaft 2011 is rotatably installed on the rack 1 and arranged along the left-right direction, and the lower ends of the two supporting arms 202 are respectively connected with two ends of the rotating shaft 2011; the servo motor is arranged on the frame 1, and a signal input end of the servo motor is electrically connected with a corresponding signal output end of the control device; a drive gear 2012 is mounted on an output shaft of the servo motor, a driven gear 2013 is mounted on a rotating shaft 2011, and the driven gear 2013 is meshed with the drive gear 2012. When the supporting arms 202 need to swing, the control device sends a control signal to the servo motor, and the servo motor drives the driven gear 2013 to rotate through the driving gear 2012, so that the rotating shaft 2011 drives the two supporting arms 202 to swing synchronously.

The first swing drive mechanism 201 further includes a second proximity switch 2015, a third proximity switch 2016, a first detection body 2017, and a second detection body (not visible in the drawing), the second proximity switch 2015 and the third proximity switch 2016 are respectively mounted on the frame 1, and signal output terminals of the second proximity switch 2015 and the third proximity switch 2016 are respectively electrically connected to a signal input terminal of the control device; the first detecting body 2017 and the second detecting body are respectively mounted on the rotating shaft 2011, the first detecting body 2017 corresponds to the detecting end position of the second proximity switch 2015, the second detecting body corresponds to the detecting end position of the third proximity switch 2016, and the vertical line between the axes of the first detecting body 2017 and the rotating shaft 2011 and the vertical line between the axes of the second detecting body and the rotating shaft 2011 form a 90-degree angle. When the support arm 202 is in the vertical state, the first detection body 2017 corresponds to the detection end position of the second proximity switch 2015, and the detection end positions of the second detection body and the third proximity switch 2016 are staggered; when the support arm 202 is in the horizontal state, the second detection body corresponds to the detection end position of the third proximity switch 2016, and the detection end positions of the first detection body 2017 and the second proximity switch 2015 are staggered; with this arrangement, when the support arm 202 swings, the control device can determine whether the support arm 202 swings in place by determining whether the second proximity switch 2015 or the third proximity switch 2016 detects a corresponding detection object, thereby controlling the start/stop of the servo motor (i.e., during the downward swing of the support arm 202, when the third proximity switch 2016 detects a second detection object, the control device controls the servo motor to stop working, and during the upward swing of the support arm 202, when the second proximity switch 2015 detects a first detection object 2017, the control device controls the servo motor to stop working).

The driven gear 2013 is a quarter gear.

The two top clamping shaft mechanisms 203 each include a first air cylinder 2031, a second air cylinder 2032, and a downward-pressing swing block 2033, the first air cylinder 2031 is mounted on the support arm 202 and moves up and down, and a piston rod of the first air cylinder 2031 extends out from below into the placement groove 2021; the cylinder body of the second cylinder 2032 is hinged to the support arm 202, the piston rod of the second cylinder 2032 is hinged to the rear end of the push-down swing block 2033, the lower front end of the push-down swing block 2033 is hinged to the support arm 202, and the push-down swing block 2033 corresponds to the position of the placement tray 2021. When the new winding shaft is not in contact with the friction roller, the piston rods of the two first cylinders 2031 extend upwards into the placing groove 2021 to jack up the two ends of the new winding shaft; when a new winding shaft needs to be pressed down, the piston rod of the first cylinder 2031 retracts downwards, so that two ends of the new winding shaft are in contact with the bottom of the placing groove 2021, meanwhile, the piston rod of the second cylinder 2032 extends out to drive the downward pressing swinging block 2033 to swing, the opening of the placing groove 2021 is covered, the new winding shaft is tightly pressed at the bottom of the placing groove 2021, and when the supporting arm 202 swings, the new winding shaft can always keep a state of being in close contact with the friction roller, and the winding cannot be influenced.

The supporting arm 202 is provided with a cylinder installation cavity 2022, the cylinder installation cavity 2022 is communicated with the placing groove 2021 through a guide through hole moving up and down, the cylinder body of the first cylinder 2031 is installed in the cylinder installation cavity 2022, and the piston rod of the first cylinder 2031 passes through the guide through hole and extends into the placing groove 2021.

The control device adopts a microcomputer controller. The hoisting mechanism 3 adopts a common hoisting machine, and the moving direction of the hoisting machine is the front-back direction.

Claims

1. A pre-reel-changing device of a winding shaft comprises a rack, a winding shaft fixing mechanism and a control device, wherein the winding shaft fixing mechanism is installed on the rack and comprises a first swing driving mechanism, two supporting arms and two top shaft clamping shaft mechanisms, the first swing driving mechanism can drive the supporting arms to swing, the first swing driving mechanism is installed on the rack, placing grooves are formed in the upper end faces of the two supporting arms, the lower ends of the two supporting arms are respectively hinged with the rack, the two top shaft clamping shaft mechanisms are in one-to-one correspondence with the two supporting arms, and the top shaft clamping shaft mechanisms are installed on the supporting arms and correspond to the positions of the placing grooves; the signal input ends of the first swing driving mechanism and the top shaft clamping mechanism are respectively and electrically connected with the corresponding signal output ends of the control device; the method is characterized in that: the roll pre-changing device further comprises a lifting mechanism and a transverse cutter detection mechanism, the lifting mechanism and the transverse cutter detection mechanism are respectively installed on the rack, the signal output end of the transverse cutter detection mechanism is electrically connected with the signal input end of the control device, and the signal input ends of the transverse cutter detection mechanism and the lifting mechanism are respectively electrically connected with the signal output end corresponding to the control device.

2. A pre-reel changer for a takeup reel, according to claim 1, wherein: the transverse cutter detection mechanism adopts a first proximity switch, the first proximity switch is installed on the rack, and the signal output end of the first proximity switch is electrically connected with the signal input end corresponding to the control device.

3. A pre-reel changer for a take-up reel according to claim 1, wherein: the first swing driving mechanism comprises a rotating shaft, a servo motor, a driving gear and a driven gear, the rotating shaft is rotatably arranged on the rack and is arranged along the left-right direction, and the lower ends of the two supporting arms are respectively connected with the two ends of the rotating shaft; the servo motor is arranged on the rack, and the signal input end of the servo motor is electrically connected with the corresponding signal output end of the control device; the driving gear is installed on servo motor's output shaft, and driven gear installs in the pivot to driven gear and driving gear mesh mutually.

4. A pre-reel changer for a takeup reel, according to claim 3, wherein: the first swing driving mechanism further comprises a second proximity switch, a third proximity switch, a first detection body and a second detection body, the second proximity switch and the third proximity switch are respectively installed on the rack, and signal output ends of the second proximity switch and the third proximity switch are respectively and electrically connected with a signal input end of the control device; the first detection body and the second detection body are respectively installed on the rotating shaft, the first detection body corresponds to the detection end position of the second proximity switch, the second detection body corresponds to the detection end position of the third proximity switch, and a vertical line between the axes of the first detection body and the rotating shaft forms a 90-degree angle with a vertical line between the axes of the second detection body and the rotating shaft.

5. A pre-reel changer for a takeup reel, according to claim 4, wherein: the driven gear is a quarter gear.

6. A pre-reel changer for a takeup reel, according to claim 1, wherein: the two top shaft clamping shaft mechanisms respectively comprise a first air cylinder, a second air cylinder and a downward pressing swinging block, the first air cylinders are mounted on the supporting arms and move up and down, and piston rods of the first air cylinders extend out of the placing grooves from the lower parts; the cylinder body of the second cylinder is hinged with the supporting arm, the piston rod of the second cylinder is hinged with the front end or the rear end of the downward pressing swinging block, the rear end or the front end of the lower part of the downward pressing swinging block is hinged with the supporting arm, and the downward pressing swinging block corresponds to the placing groove.

7. A wind-up reel pre-changer according to claim 6, wherein: be equipped with the cylinder installation cavity on the support arm, the cylinder installation cavity through the direction through-hole of a trend from top to bottom with the standing groove intercommunication, the cylinder body of first cylinder is installed in the cylinder installation cavity, and the piston rod of first cylinder passes the direction through-hole and stretches into in the standing groove.