CN218188128U

CN218188128U - Automatic cleaning device for circulating water tank of generator set

Info

Publication number: CN218188128U
Application number: CN202222598461.6U
Authority: CN
Inventors: 郑金成
Original assignee: Beijing Gaoantun Waste To Energy Co ltd
Current assignee: Beijing Gaoantun Waste To Energy Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-03
Anticipated expiration: 2032-09-29

Abstract

The application relates to a generating set circulating water pond self-cleaning device relates to the filterable field of circulating water, and it is including wasing subassembly, drive assembly and installation component. The mounting assembly comprises a mounting seat and a driving rod, and a first driving block is connected to the driving rod in a threaded manner; the driving assembly comprises a first air cylinder; the cleaning assembly comprises a cleaning net. Starting the automatic cleaning device, wherein the first driving block reaches the pool wall at the other side of the circulating pool from the pool wall at one side of the circulating pool along the driving rod; at the in-process of first drive block motion, the clean net of installation on the first cylinder drags for salvages the debris in the circulating water pond, and first cylinder can be according to the high salvage height of salvaging to the clean net in the circulating water pond adjusting, and the debris around the reducible clean filter screen are piled up and are blockked up clean filter screen, guarantee the filter screen to the filter effect of circulating water, adopt automatic cleaning device simultaneously, do not need the staff manual work to clean the filter screen, have alleviateed staff's working strength.

Description

Automatic cleaning device for circulating water tank of generator set

Technical Field

The application relates to the field of circulating water filtration, in particular to an automatic cleaning device for a circulating water tank of a generator set.

Background

The circulating water system of the power plant is a key system for providing a cooling water source for the generator set and cooling. The exhaust steam of the steam turbine is condensed in the condenser, the waste heat generated in the condensation process is taken away by using cooling water, and the cooling water is obtained from a natural water body or is cooled by a cooling tower, enters a circulating water tank and then flows into the condensing equipment. The safe and stable operation of the circulating water system is concerned with the safety and the economical efficiency of the power generating unit, impurities in the environment such as leaves, flying flocs, dust, wind and sand and the like easily enter a circulating water tank due to the influence of climate and environment, so that the water quality in the circulating water tank is deteriorated, the impurities are more likely to block a condenser copper pipe and a heat exchanger in the circulating water system, the operation safety of the power generating unit is further influenced, the power generating unit is forced to stop operating in serious cases, and the circulating water tank needs to be cleaned in time to ensure the water quality of circulating water.

The existing generator set circulating water tank is provided with a clean filter screen, the clean filter screen is used for a long time, a large amount of sundries are gathered around the clean filter screen and possibly block the clean filter screen, workers need to clean the filter screen manually, the clean filter screen is detached from the circulating water tank by adopting a hand-pulling type chain block when the cleaning is finished, then the clean filter screen is cleaned, and the clean filter screen is reinstalled into the circulating water tank after the cleaning is finished so as to ensure the filtering effect of the filter screen on circulating water.

To the correlation technique among the above-mentioned, the inventor thinks adopt the manual work to dismantle the mode of clearing up with clean filter screen among the prior art, and staff's working strength is great, and the staff has the risk that drops in the circulating water pond when dismantling clean filter screen, and is dismantling the in-process of clearing up with the filter screen, can't filter the debris in the circulating water pond to probably influence generating set's normal operating.

SUMMERY OF THE UTILITY MODEL

In order to make clean filter screen keep clean, guarantee clean filter screen and to the filter effect of circulating water, alleviate staff's working strength simultaneously, this application provides a generating set circulating water pond self-cleaning device.

The application provides a generating set circulating water pond self-cleaning device adopts following technical scheme:

the automatic cleaning device for the circulating water tank of the generator set comprises a cleaning assembly, a driving assembly and a mounting assembly, wherein the driving assembly is used for mounting the cleaning assembly, and the mounting assembly is used for mounting the driving assembly;

the mounting assembly comprises a mounting seat mounted between the walls of the circulating water pool on two sides and a driving rod rotatably connected and mounted on the mounting seat, a first driving block is connected to the driving rod in a threaded manner, and the first driving block is connected with the mounting seat in a sliding manner; the driving assembly comprises a first air cylinder vertically arranged on the first driving block; the cleaning assembly comprises a cleaning net fishing net arranged on the output shaft of the first cylinder.

By adopting the technical scheme, the automatic cleaning device is started, and the driving rod rotates to drive the first driving block to reach the wall of the other side of the circulating water tank from the wall of one side of the circulating water tank along the driving rod; in the process of the movement of the first driving block, the first driving block drives the cleaning net arranged on the first air cylinder to salvage sundries in the circulating water tank, and the first air cylinder can adjust the salvage height of the cleaning net salvage according to the horizontal height in the circulating water tank; therefore, sundries around the clean filter screen can be reduced to be accumulated to block the clean filter screen, the filtering effect of the filter screen on circulating water is guaranteed, meanwhile, the automatic cleaning device is adopted, workers do not need to clean the filter screen manually, and the working strength of the workers is reduced.

Optionally, the cleaning net fishing comprises a fishing frame and a leaking net installed on the fishing frame, and the fishing frame is vertically installed on the first cylinder.

Through adopting above-mentioned technical scheme, salvage the frame and vertically install on first cylinder, debris get into along salvage the frame and leak the net when salvaging, are difficult for falling out from leaking the net, and it is better to salvage the effect.

Optionally, a reinforcing rod is installed on the salvaging frame, a hook is arranged on the reinforcing rod, and the strainer is connected with the reinforcing rod through the hook.

By adopting the technical scheme, the leaking net is hung on the reinforcing rod, when the salvaged sundries are more and heavier, the reinforcing rod can balance the force borne by the leaking net, and the leaking net cannot fall off from the salvage frame due to the gravity action of the sundries.

Optionally, a second driving block is connected to the driving rod in a threaded manner, a second cylinder is mounted on the second driving block, and the cleaning assembly further comprises a cleaning scraper vertically mounted on an output shaft of the second cylinder.

Through adopting above-mentioned technical scheme, the second drive block moves on the actuating lever and drives the clean scraper blade of installation on the second cylinder and clean the dirt on clean filter screen surface, and clean scraper blade can further clean filter screen to strengthen the filter effect of clean filter screen to the circulating water, the height of the adjustable clean scraper blade of second cylinder simultaneously, so that clean scraper blade cleans clean filter screen comprehensively.

Optionally, a guide structure is arranged on one side of the cleaning scraper, which is in contact with the cleaning filter screen.

Through adopting above-mentioned technical scheme, when cleaning the filter screen, through guide structure, the dirt on clean filter screen surface drops more easily by clean scraper blade.

Optionally, the driving rod is further connected with a third driving block and a fourth driving block in a threaded manner, the third driving block is provided with a third cylinder, the fourth driving block is provided with a fourth cylinder, and the cleaning assembly further comprises a cleaning steel brush arranged on an output shaft of the third cylinder and a spray header arranged on an output shaft of the fourth cylinder.

Through adopting above-mentioned technical scheme, the dirt of clean steel brush in to the net of clean filter screen is scrubbed, and the obstinate dirt on the net of clean filter screen is not hard up, erodees not hard up dirt through shower head spun water under high pressure after that to self-cleaning device is better to the clean effect of clean filter screen, the height of the adjustable clean steel brush of third cylinder simultaneously, the height of the adjustable shower head of fourth cylinder, so that clean scraper blade and shower head clean the filter screen comprehensively.

Optionally, the cleaning net drags for the cleaning scraper blade the cleaning steel brush with the shower head all is provided with the installation department, all set up the mounting hole on the installation department, the lateral wall of mounting hole is equipped with the screw thread, first cylinder the second cylinder the third cylinder with the tip of the output shaft of fourth cylinder all is provided with the screw thread.

Through adopting above-mentioned technical scheme, clean net drag for with the output shaft threaded connection of first cylinder, the output shaft threaded connection of clean scraper blade and second cylinder, the output shaft threaded connection of clean steel brush and third cylinder, the output shaft threaded connection of shower head and fourth cylinder to it is firm to clean the installation of subassembly on drive assembly in the cleaning process, and clean subassembly can be dismantled from drive assembly conveniently when needing to be changed simultaneously.

Optionally, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are all provided with mounting rings, the mounting ring of the first cylinder is mounted on the first driving block through a bolt, the mounting ring of the second cylinder is mounted on the second driving block through a bolt, the mounting ring of the third cylinder is mounted on the third driving block through a bolt, and the mounting ring of the fourth cylinder is mounted on the fourth driving block through a bolt.

Through adopting above-mentioned technical scheme, the installation of first cylinder on first driving block, the installation of second cylinder on the second driving block, the installation of third cylinder on the third driving block, the installation of fourth cylinder on the fourth driving block are all more firm.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the driving rod rotates to drive the first driving block to reach the other side of the circulating water pool from the pool wall of one side of the circulating water pool along the driving rod, the first driving block drives the cleaning net arranged on the first air cylinder to fish up sundries in the circulating water pool, and the first air cylinder can adjust the fishing height of the cleaning net according to the height of a horizontal plane in the circulating water pool; therefore, sundries around the clean filter screen can be reduced from being accumulated to block the clean filter screen, the filtering effect of the filter screen on circulating water is ensured, meanwhile, an automatic cleaning device is adopted, workers do not need to clean the filter screen manually, and the working strength of the workers is reduced;

2. the cleaning scraper plate cleans dirt on the surface of the cleaning filter screen, the cleaning scraper plate can further clean the cleaning filter screen to enhance the filtering effect of the cleaning filter screen on circulating water, and meanwhile, the second cylinder can adjust the height of the cleaning scraper plate so that the cleaning scraper plate can comprehensively clean the cleaning filter screen;

3. the dirt of cleaning steel brush in to the net of clean filter screen is scrubbed, and the obstinate dirt on the net of clean filter screen is not hard up, erodees not hard up dirt through shower head spun water under high pressure after that to automatic cleaning device is better to the clean effect of clean filter screen, and the height of the adjustable clean steel brush of third cylinder, the height of the adjustable shower head of fourth cylinder simultaneously, so that clean scraper blade and shower head clean the filter screen comprehensively.

Drawings

FIG. 1 is a schematic view showing a structure in which an automatic cleaning apparatus is installed on a circulation tank;

FIG. 2 is a schematic structural diagram of an automatic cleaning device for a circulating water tank of a generator set;

FIG. 3 is a schematic view of a partial structure of the automatic cleaning apparatus;

FIG. 4 is a schematic view of a partial explosion of the automatic cleaning apparatus;

FIG. 5 is a schematic view of the structure of the cleaning net fishing device.

Description of reference numerals:

1. a circulating water tank; 2. cleaning the filter screen; 3. mounting the component; 31. a mounting seat; 32. a motor; 33. a drive rod; 34. a first driving block; 35. a second driving block; 36. a third driving block; 37. a fourth drive block; 4. a drive assembly; 41. a first cylinder; 42. a second cylinder; 43. a third cylinder; 44. a fourth cylinder; 45. a mounting ring; 46. a bolt; 5. cleaning the assembly; 51. cleaning and fishing the net; 511. fishing the frame; 512. a reinforcing bar; 513. hooking; 514. a leakage net; 52. a cleaning blade; 521. a guide structure; 53. cleaning the steel brush; 54. a shower head; 55. an installation part; 551. and (7) mounting holes.

Detailed Description

The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application to assist in understanding, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

It should be noted that the terms "first", "second", etc. in the present invention are used for distinguishing similar objects, and are not necessarily used for describing a particular order or sequence. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure.

The present application is described in further detail below with reference to figures 1-5.

Referring to fig. 1, the embodiment of the application discloses an automatic cleaning device for a circulating water tank of a generator set, which comprises a cleaning assembly 5, a driving assembly 4 for installing the cleaning assembly 5 and a mounting assembly 3 for installing the driving assembly 4.

The cleaning filter screen 2 is installed on the water outlet of the circulating water tank 1, leaves and other sundries of landscape trees beside the circulating water tank 1 are blown down into the circulating water tank 1 in windy weather, and along with the flowing of circulating water, various sundries are accumulated around the cleaning filter screen 2 at the water outlet of the circulating water tank 1 to block the cleaning filter screen 2, so that the cleaning filter screen 2 can be automatically cleaned by using the automatic cleaning device.

Referring to fig. 1 and 2, the mounting assembly 3 includes a mounting seat 31, a driving rod 33 and a first driving block 34, the mounting seat 31 is mounted across the circulating water tank 1, and both ends of the mounting seat 31 are fixed on the tank walls on both sides of the circulating water tank 1. The driving rod 33 is arranged below the mounting seat 31 and faces the direction of the circulating water tank 1, the driving rod 33 is rotatably connected to the mounting seat 31, and the mounting seat 31 is provided with a motor 32 for rotating the driving rod 33. The driving rod 33 is provided with threads, the first driving block 34 is of a cube structure, the first driving block 34 is connected to the driving rod 33 in a threaded mode, the upper surface of the first driving block 34 is attached to the surface of the mounting seat 31, and the first driving block 34 is connected to the mounting seat 31 in a sliding mode.

Referring to fig. 3, the driving assembly 4 includes a first cylinder 41, the first cylinder 41 is vertically installed on the first driving block 34, and an output shaft of the first cylinder 41 is disposed toward the circulating water tank 1 (refer to fig. 1). The base of the first cylinder 41 is integrally provided with a circular mounting ring 45, the mounting ring 45 is fixed on the first driving block 34 through a bolt 46, and the first cylinder 41 and the first driving block 34 are firmly and tightly mounted.

Referring to fig. 4 and 5, the cleaning assembly 5 comprises a cleaning net scoop 51, the cleaning net scoop 51 comprises a rectangular scoop frame 511 and a drain net 514 arranged on the scoop frame 511, and the drain net 514 is made of nylon and is durable. The fishing frame 511 is provided with an installation part 55 integrally formed on the outer edge, the installation part 55 is provided with an installation hole 551, the free end of the output shaft of the first cylinder 41 is provided with a thread, the installation part 55 is in threaded connection with the first cylinder 41, and the fishing frame 511 is vertically installed on the first cylinder 41.

When cleaning the cleaning filter screen 2 (refer to fig. 1), starting the motor 32, and driving the driving rod 33 to rotate to drive the first driving block 34 to reach the other side of the circulating water pool 1 from the pool wall of one side of the circulating water pool 1 to the pool wall of the other side of the circulating water pool 1 along the driving rod 33; in the process of the movement of the first driving block 34, the first driving block 34 drives the cleaning net fishing 51 arranged on the first cylinder 41 to fish up the sundries in the circulating water tank 1, the first cylinder 41 drives the cleaning net fishing 51 to move up and down, the fishing height of the cleaning net fishing 51 is adjusted according to the height of the horizontal plane in the circulating water tank 1, the fishing frame 511 is vertically arranged on the first cylinder 41, the sundries enter the leaking net 514 along the fishing frame 511 during fishing, the sundries are not easy to fall out of the leaking net 514, the fishing effect is better, and therefore the sundries around the cleaning filter net 2 can be reduced to be piled up to block the cleaning filter net 2.

The cleaning net fishing device 51 further comprises a plurality of reinforcing rods 512, the reinforcing rods 512 are welded on the fishing frame 511, the extending direction of the reinforcing rods 512 is perpendicular to the fishing frame 511, a plurality of hooks 513 are uniformly formed on the reinforcing rods 512 in an integrated mode, and the leakage net 514 is connected with the reinforcing rods 512 through the hooks 513. When the fished sundries are more and heavier, the reinforcing rod 512 can balance the force borne by the strainer 514, the gravity borne by the strainer 514 cannot be concentrated at the bottom of the strainer 514, so that the strainer 514 cannot fall off from the fishing frame 511 under the action of the gravity of the sundries, and the fishing frame 511 can be detached from the first cylinder 41 to dump the sundries when the strainer 514 is filled with the sundries.

Referring to fig. 3 and 4, a second driving block 35, a third driving block 36 and a fourth driving block 37 are further screwed on the driving rod 33; the driving assembly 4 further comprises a second air cylinder 42, a third air cylinder 43 and a fourth air cylinder 44, wherein the bottoms of the second air cylinder 42, the third air cylinder 43 and the fourth air cylinder 44 are integrally provided with a circular mounting ring 45. The mounting ring 45 of the second cylinder 42 is fixed to the second drive block 35 by a bolt 46, the mounting ring 45 of the third cylinder 43 is fixed to the third drive block 36 by a bolt 46, and the mounting ring 45 of the fourth cylinder 44 is fixed to the fourth drive block 37 by a bolt 46.

The cleaning assembly 5 further comprises a cleaning scraper blade 52 mounted on an output shaft of the second air cylinder 42, threads are arranged on the output shaft of the second air cylinder 42, the cleaning scraper blade 52 is vertically mounted on the second air cylinder 42, a mounting portion 55 is arranged at one end of the cleaning scraper blade 52, a mounting hole 551 is arranged on the mounting portion 55, threads are arranged on the inner side wall of the mounting hole 551, the cleaning scraper blade 52 is in threaded connection with the output shaft of the second air cylinder 42, and the mounting mode between the cleaning scraper blade 52 and the second air cylinder 42 is the same as that between the cleaning net fishing 51 and the first air cylinder 41. A guide structure 521, i.e., a guide slope inclined from an end of the cleaning blade 52 to both sides thereof, is provided at a side of the cleaning blade 52 contacting the cleaning screen 2 (refer to fig. 1).

The second driving block 35 moves on the driving rod 33 to drive the cleaning scraper 52 mounted on the second cylinder 42 to scrape and clean dirt on the surface of the cleaning filter screen 2 (refer to fig. 1), and further clean the cleaning filter screen 2, so as to enhance the filtering effect of the cleaning filter screen 2 on circulating water; meanwhile, the second air cylinder 42 can adjust the height of the cleaning scraper 52, so that the cleaning scraper 52 can clean the cleaning filter screen 2 completely; the guide structure 521 is provided to allow dirt on the surface of the cleaning screen 2 to be more easily removed when the cleaning blade 52 cleans the cleaning screen 2.

The cleaning assembly further comprises a cleaning steel brush 53 mounted on the output shaft of the third cylinder 43 and a spray head 54 mounted on the output shaft of the fourth cylinder 44, the water inlet of the spray head 54 is connected with a high-pressure spray gun, the brush direction of the cleaning steel brush 53 faces the direction of cleaning the filter screen 2 (refer to fig. 1), a mounting part 55 is arranged on the side wall of the cleaning steel brush 53, the water spraying direction of the spray head 54 also faces the direction of cleaning the filter screen 2, and meanwhile, a mounting part 55 is also arranged on the side wall of the spray head 54. The cleaning steel brush 53 and the third cylinder 43 are mounted in the same way as the cleaning net scoop 51 and the first cylinder 41, and the shower head 54 and the fourth cylinder 44 are mounted in the same way as the cleaning net scoop 51 and the first cylinder 41.

The third driving block 36 moves along the driving rod 33 to drive the cleaning steel brush 53 mounted on the third cylinder 43 to brush the dirt in the meshes of the cleaning filter screen 2 (refer to fig. 1), so that the stubborn dirt on the meshes of the cleaning filter screen 2 is loosened; then the fourth driving block 37 moves along the driving rod 33 to drive the spray head 54 mounted on the fourth cylinder 44 to move to the vicinity of the cleaning filter screen 2, and the loosened dirt is washed by the high-pressure water flow sprayed by the spray head 54; therefore, the automatic cleaning device has better cleaning effect on the cleaning filter screen 2, meanwhile, the third air cylinder 43 can adjust the height of the cleaning steel brush 53, and the fourth air cylinder 44 can adjust the height of the spray header 54, so that the cleaning scraper 52 and the spray header 54 can clean the cleaning filter screen 2 comprehensively.

The implementation principle of the automatic cleaning device for the generator set circulating water tank is as follows: starting the automatic cleaning device, driving the driving rod 33 to rotate by the motor 32, moving the first driving block 34 on the driving rod 33 from one side of the circulating water tank 1 to the other side, simultaneously driving the first air cylinder 41 and the cleaning net scooping device 51 to scoop up the sundries around the cleaning filter net 2, and adjusting the height of the cleaning net scooping device 51 by the first air cylinder 41 according to the actual conditions; then the second driving block 35 drives the second air cylinder 42 and the cleaning scraper 52 to scrape off dirt on the surface of the cleaning filter screen 2, and the second air cylinder 42 can adjust the working height of the cleaning scraper 52 according to requirements; then the third driving block 36 drives the third cylinder 43 and the cleaning steel brush 53 to brush and brush the dirt in the meshes of the cleaning filter screen 2, so that the dirt is loosened; finally, the fourth driving block 37 drives the fourth cylinder 44 and the spray header 54 to wash the loosened dirt; thereby clean filter screen 2 keeps clean through self-cleaning device's cleanness, has ensured clean filter screen 2 to the filter effect of circulating water, adopts self-cleaning device, does not need the staff manual work to clean the filter screen, has alleviateed staff's work burden.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a generating set circulating water pond self-cleaning device which characterized in that: comprises a cleaning component (5), a driving component (4) used for installing the cleaning component (5) and a mounting component (3) used for installing the driving component (4);

the mounting assembly (3) comprises a mounting seat (31) mounted between the pool walls on two sides of the circulating pool (1) and a driving rod (33) rotatably connected and mounted on the mounting seat (31), a first driving block (34) is connected to the driving rod (33) in a threaded manner, and the first driving block (34) is connected with the mounting seat (31) in a sliding manner; the driving assembly (4) comprises a first air cylinder (41) vertically mounted on the first driving block (34); the cleaning assembly (5) comprises a cleaning net scoop (51) arranged on an output shaft of the first cylinder (41).

2. The automatic cleaning device for the circulating water tank of the generator set according to claim 1, characterized in that: the cleaning net fishing (51) comprises a fishing frame (511) and a leaking net (514) installed on the fishing frame (511), and the fishing frame (511) is vertically installed on the first air cylinder (41).

3. The automatic cleaning device for the circulating water tank of the generator set according to claim 2, characterized in that: the fishing net is characterized in that a reinforcing rod (512) is installed on the fishing frame (511), a hook (513) is arranged on the reinforcing rod (512), and the leaking net (514) is connected with the reinforcing rod (512) through the hook (513).

4. The automatic cleaning device for the circulating water tank of the generator set according to claim 1, characterized in that: the cleaning device is characterized in that a second driving block (35) is connected to the driving rod (33) in a threaded mode, a second air cylinder (42) is installed on the second driving block (35), and the cleaning assembly (5) further comprises a cleaning scraper (52) which is vertically installed on an output shaft of the second air cylinder (42).

5. The automatic cleaning device for the circulating water tank of the generator set according to claim 4, characterized in that: and a guide structure (521) is arranged on one side of the cleaning scraper (52) contacting with the cleaning filter screen (2).

6. The automatic cleaning device for the circulating water tank of the generator set according to claim 4, characterized in that: still threaded connection has third drive block (36) and fourth drive block (37) on actuating lever (33), install third cylinder (43) on third drive block (36), install fourth cylinder (44) on fourth drive block (37), wash subassembly (5) still including install in clean steel brush (53) on third cylinder (43) output shaft and install in shower head (54) on fourth cylinder (44) output shaft.

7. The automatic cleaning device for the circulating water tank of the generator set according to claim 6, characterized in that: the cleaning net fishing device is characterized in that the cleaning net fishing device (51), the cleaning scraper blade (52), the cleaning steel brush (53) and the spray header (54) are respectively provided with an installation part (55), installation holes (551) are respectively arranged on the installation parts (55), the side wall of each installation hole (551) is provided with threads, and the end parts of output shafts of the first cylinder (41), the second cylinder (42), the third cylinder (43) and the fourth cylinder (44) are respectively provided with threads.

8. The automatic cleaning device for the circulating water tank of the generator set according to claim 6, characterized in that: the first air cylinder (41), the second air cylinder (42), the third air cylinder (43) and the fourth air cylinder (44) are provided with mounting rings (45), the mounting rings (45) of the first air cylinder (41) are mounted on the first driving block (34) through bolts (46), the mounting rings (45) of the second air cylinder (42) are mounted on the second driving block (35) through bolts (46), the mounting rings (45) of the third air cylinder (43) are mounted on the third driving block (36) through bolts (46), and the mounting rings (45) of the fourth air cylinder (44) are mounted on the fourth driving block (37) through bolts (46).