CN112407557A

CN112407557A - Handkerchief paper is with storage device who has dampproofing mechanism

Info

Publication number: CN112407557A
Application number: CN202011246418.2A
Authority: CN
Inventors: 袁微; 袁付华
Original assignee: Changde Changling Machinery Manufacturing Technology Co ltd
Current assignee: Changde Changling Machinery Manufacturing Technology Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-02-26

Abstract

The invention relates to the technical field of handkerchief paper storage, in particular to a storage device with a moisture-proof mechanism for handkerchief paper, which comprises a device main body, wherein the device main body comprises a storage box body, first fixed blocks are fixedly arranged on two sides in the storage box body, first sliding grooves are formed in the mutually adjacent sides of the first fixed blocks, first sliding blocks are slidably arranged in the first sliding grooves, connecting blocks are fixedly connected to the mutually adjacent sides of the first sliding blocks, a bearing table is fixedly connected between the connecting blocks, a ventilation port is formed in the front face of the bottom end of a sealing door, and a ventilation assembly is arranged at the top end of the storage box body. According to the invention, the ventilating assembly and the ventilating opening are arranged, so that air blown out by the ventilating fan can be transmitted out through the ventilating opening, the air flow rate in the storage box body is accelerated, the ventilating effect is achieved, the dry environment is continuously kept in the storage box body, and the problems that the handkerchief paper is easy to damp and is not beneficial to subsequent packaging and sale are solved.

Description

Handkerchief paper is with storage device who has dampproofing mechanism

Technical Field

The invention relates to the technical field of handkerchief paper storage, in particular to a storage device with a moisture-proof mechanism for handkerchief paper.

Background

With the continuous improvement of the living standard of people, the production and sales volume of paper for daily use, in particular to handkerchief paper, is steadily increased, and the handkerchief paper is novel cleaning paper, has the function of being equivalent to the traditional handkerchief, plays a role of wiping and is made of soft paper; the handkerchief paper adopts independent small and exquisite packing, and is more miniature, more body-building, and it is very convenient to carry, is applicable to any occasion. When the handkerchief paper is produced, a series of production processes such as folding, cutting, embossing, packing and the like are needed.

The handkerchief paper is after the processing is accomplished, need place handkerchief paper and accomodate together, after processing a certain amount, take out the handkerchief paper again and pack, accomodate the in-process, because the storage time is longer, it has good ventilative effect to keep accomodating the space, however, current containing box structure function singleness can not make the storage space keep dry ventilative effect, lead to the containing box when storing handkerchief paper, handkerchief paper is wet easily, be unfavorable for subsequent packing and sale, consequently, need design a handkerchief paper with the storage device who has dampproofing mechanism in order to solve above-mentioned problem.

Disclosure of Invention

The invention aims to provide a storage device with a moisture-proof mechanism for handkerchief paper, which aims to solve the problems that in the storage process, due to long storage time, the storage space is required to have good ventilation effect, however, the existing storage box has a single structure and function, the storage space cannot be kept dry and ventilated, so that the handkerchief paper is easy to be wetted when the handkerchief paper is stored in the storage box, and the subsequent packaging and sale are not facilitated.

In order to achieve the purpose, the invention provides the following technical scheme: a handkerchief paper containing device with a moisture-proof mechanism comprises a device main body, wherein the device main body comprises a storage box body, first fixed blocks are fixedly arranged on two sides inside the storage box body, first sliding grooves are formed in the sides, close to each other, of the first fixed blocks, first sliding blocks are slidably arranged inside the first sliding grooves, connecting blocks are fixedly connected to the sides, close to each other, of the first sliding blocks, a bearing table is fixedly connected between the connecting blocks, a sealing door is movably arranged on the front surface of the storage box body through hinges, a ventilation opening is formed in the front surface of the bottom end of the sealing door, a ventilation assembly is arranged at the top end of the storage box body and comprises a first mounting plate, one side of the first mounting plate is fixedly connected with one side inside the storage box body, a ventilation groove is formed in the top end of the storage box body, a ventilation fan is fixedly arranged at the top end of the first mounting, the both sides on storage box top all the stationary phase even have the head rod, the top fixed mounting of head rod has the guard plate.

Preferably, the top of plummer is installed and is compressed tightly the subassembly, it includes the mounting groove to compress tightly the subassembly, the inside at the plummer is seted up to the mounting groove, the inside bottom fixed mounting of mounting groove has the second mounting panel, the top fixedly connected with straining spring of second mounting panel, straining spring's top fixed mounting has the fly leaf, the liftout groove has been seted up on the top of plummer, the top fixedly connected with second connecting rod of fly leaf, the top fixed phase of second connecting rod even has the extension rod, the top fixed mounting of extension rod has the pressure strip, the top fixedly connected with of pressure strip draws and gets the handle.

Preferably, the front of the sealing door close to the ventilation opening is fixedly provided with two second fixed blocks, the front of each second fixed block is provided with a second sliding groove, the insides of the second sliding grooves are provided with second sliding blocks in a sliding manner, and the front of each second sliding block is fixedly connected with a protective mesh enclosure.

Preferably, a clamping groove is formed in the top end of the second fixing block, a clamping rod is inserted into the clamping groove, and a clamping block is fixedly connected to the top end of the clamping rod.

Preferably, the height of the first connecting rod is 10cm, and the bottom ends of the two sides of the protection plate are both arc-shaped.

Preferably, the inside both sides of mounting groove are fixed mounting all have the third fixed block, the third sliding tray has all been seted up to one side that the third fixed block is close to each other, the inside all slidable mounting of third sliding tray has the third sliding block, the both sides of fly leaf all with third sliding block fixed connection.

Preferably, the top end of the extension rod extends to the top of the bearing table, and the diameter of the extension rod is 1mm smaller than that of the ejection groove.

Preferably, the bottom fixed mounting of pressure strip has the baffle, the quantity of baffle is two, the height that highly is less than the extension rod of baffle, the length that the length of baffle is less than the length of protection pad.

Preferably, a protection pad is fixedly installed at the bottom end of the compression plate, and the cross-sectional area of the protection pad is smaller than that of the compression plate.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the ventilation component and the ventilation port, the air blown out by the ventilation fan can be transmitted out through the ventilation port, so that the air flow rate in the storage box body is accelerated, the ventilation port and the ventilation groove play a good ventilation effect, the interior of the storage box body is continuously kept in a dry environment, the problem that the handkerchief paper is not easy to be stored in the storage process is solved, because the storage time is long and the effect of drying and ventilating the storage space can not be kept, when the handkerchief paper is stored in the storage box, the handkerchief paper is easy to be affected with damp, which is not beneficial to the subsequent packaging and sale, the first connecting rod and the protective plate can play the role of shielding dust, thereby ensuring that dust cannot be accumulated on the handkerchief paper in the storage box body, the height of the first connecting rod is higher, and the two sides of the protection plate are arc-shaped, the storage box body is not influenced to ventilate when the protective effect is played, and the practicability of the device main body is improved.

2. Through being provided with second fixed block, second sliding tray, second sliding block and protection screen panel, protection screen panel has played the effect of protection, makes ventilative mouthful can not amass the dust and cause ventilative mouthful to block up, simultaneously, has also guaranteed that the dust can not enter into inside the storage box body from ventilative mouthful, and protection screen panel also can not influence ventilative mouthful ventilative when playing dustproof effect.

3. By arranging the tension spring, the movable plate and the pressing plate, the tension force of the tension spring acts on the movable plate, so that the top end of the pressing plate can tightly press the placed handkerchief paper, thereby the handkerchief paper can be stably stored in the storage box body, the handkerchief paper is not blown by the ventilating fan when in work, the practicability of the device main body is improved, through the arrangement of the third fixed block, the third sliding groove, the third sliding block, the ejecting groove and the extension rod, when the movable plate moves, the third sliding block slides in the third sliding groove, which can play the role of assisting the movable plate to move, and improve the stability of the movable plate when moving, therefore, the pressing plate is convenient for operators to operate, the distance between the ejection groove and the extension rod is small, the ejection groove is guaranteed to be stable inside the extension rod, and the pressing plate is convenient for the operators to operate.

Drawings

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is a front view of the opening structure of the sealing door of the present invention;

FIG. 3 is a schematic top sectional view of an opening structure of the sealing door of the present invention;

FIG. 4 is an enlarged front view of the carrier stage structure of the present invention;

FIG. 5 is a schematic bottom view of the hold-down plate structure of the present invention;

FIG. 6 is an enlarged side view of the protective guard structure of the present invention;

FIG. 7 is an enlarged view of a portion of the structure of FIG. 2 at B in accordance with the present invention;

FIG. 8 is an enlarged view of a portion of the structure of FIG. 1 at C in accordance with the present invention;

FIG. 9 is an enlarged partial cross-sectional view of the structure of FIG. 4 at D in accordance with the present invention;

fig. 10 is a partial enlarged cross-sectional view of the structure at E in fig. 3 according to the present invention.

In the figure: 100. a device main body; 110. a storage box body; 111. a first fixed block; 112. a first sliding groove; 113. a first slider; 114. connecting blocks; 115. a bearing table; 116. a sealing door; 117. a ventilation opening; 118. a second fixed block; 119. a second sliding groove; 120. a second slider; 121. a protective mesh enclosure; 122. a clamping groove; 123. a clamping and connecting rod; 124. a clamping block; 200. a ventilation assembly; 210. a first mounting plate; 211. a ventilation slot; 212. a ventilating fan; 213. a first connecting rod; 214. a protection plate; 300. a compression assembly; 310. mounting grooves; 311. a second mounting plate; 312. tensioning the spring; 313. a movable plate; 314. a third fixed block; 315. a third sliding groove; 316. a third slider; 317. ejecting the groove; 318. a second connecting rod; 319. an extension rod; 320. a compression plate; 321. pulling the handle; 322. a protective pad; 323. a barrier plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, an embodiment of the present invention is shown:

a handkerchief paper storage device with a moisture-proof mechanism comprises a device main body 100, wherein a ventilating fan 212 used in the device main body 100 is a product which can be directly purchased in the market, the principle of the ventilating fan is the prior art which is well known to those skilled in the art, and therefore the description is omitted, the device main body 100 comprises a storage box body 110, two sides inside the storage box body 110 are fixedly provided with first fixed blocks 111, one sides, close to each other, of the first fixed blocks 111 are provided with first sliding grooves 112, one sides, close to each other, of the first sliding grooves 112 are slidably provided with first sliding blocks 113, one sides, close to each other, of the first sliding blocks 113 are fixedly connected with connecting blocks 114, a bearing platform 115 is fixedly connected between the connecting blocks 114, the front surface of the storage box body 110 is movably provided with a sealing door 116 through a hinge, the front surface at the bottom end of the sealing door 116 is provided with a ventilating opening 117, the top, one side of the first mounting plate 210 is fixedly connected with one side of the interior of the storage box 110, the top end of the storage box 110 is provided with a ventilation groove 211, the top end of the first mounting plate 210 is fixedly provided with a ventilation fan 212, both sides of the top end of the storage box 110 are fixedly connected with a first connecting rod 213, the top end of the first connecting rod 213 is fixedly provided with a protection plate 214, the ventilation fan 212 is started to work, the ventilation fan 212 can blow air to the interior of the storage box 110 when working, the air blown out by the ventilation fan 212 can penetrate through the ventilation port 117, so that the air flow rate in the storage box 110 is accelerated, the ventilation port 117 and the ventilation groove 211 play a good ventilation effect, so that the interior of the storage box 110 can continuously keep a dry environment, and the problem that in the process of storing handkerchief paper, the effect of the storage space can not be kept dry and ventilated due to long storage time is, the handkerchief paper is easy to be affected with damp, which is not beneficial to the subsequent packaging and sale.

Further, the compressing assembly 300 is installed at the top of the bearing table 115, the compressing assembly 300 includes a mounting groove 310, the mounting groove 310 is opened inside the bearing table 115, a second mounting plate 311 is fixedly installed at the bottom end inside the mounting groove 310, a tensioning spring 312 is fixedly connected to the top end of the second mounting plate 311, a movable plate 313 is fixedly installed at the top end of the tensioning spring 312, a pushing groove 317 is formed at the top end of the bearing table 115, a second connecting rod 318 is fixedly connected to the top end of the movable plate 313, an extending rod 319 is fixedly connected to the top end of the second connecting rod 318, a compressing plate 320 is fixedly installed at the top end of the extending rod 319, a pulling handle 321 is fixedly connected to the top end of the compressing plate 320, when a worker places handkerchief paper, the pulling handle 321 is held first, the compressing plate 320 is lifted upwards, the compressing plate 320 is moved upwards, and the compressing plate 320 drives the extending rod 319 and, the second connecting rod 318 drives the movable plate 313 to move upwards, so that the length of the tension spring 312 is gradually increased, at this time, the tension spring 312 generates a pulling force, the handkerchief paper to be stored is placed at the bottom end of the pressing plate 320, the pulling handle 321 is released, at this time, the pulling force of the tension spring 312 acts on the movable plate 313, so that the movable plate 313 moves downwards, the movable plate 313 drives the second connecting rod 318 and the extending rod 319 to move downwards, so that the pressing plate 320 moves downwards, the top end of the pressing plate 320 can tightly press the placed handkerchief paper, so that the handkerchief paper can be stably stored in the storage box 110, the handkerchief paper is prevented from being blown by the ventilation fan 212 during operation, and the practicability of the device main body 100 is improved.

Further, the front fixed mounting that sealing door 116 is close to ventilative mouthful 117 has second fixed block 118, the quantity of second fixed block 118 is two, second sliding tray 119 has all been seted up in the front of second fixed block 118, all slidable mounting has second sliding block 120 in the inside of second sliding tray 119, the front of second sliding block 120 is fixed to be linked with protection screen panel 121, protection screen panel 121 has played the effect of protection, make ventilative mouthful 117 can not amass the dust and cause ventilative mouthful 117 to block up, and simultaneously, it can not enter into inside the storage box 110 from ventilative mouthful 117 also to have guaranteed the dust, protection screen panel 121 also can not influence ventilative mouthful 117 when playing dustproof effect and breathe freely.

Further, joint groove 122 has been seted up on the top of second fixed block 118, joint pole 123 has all been inserted in the inside of joint groove 122 and has been installed, the top fixedly connected with joint piece 124 of joint pole 123, insert joint pole 123 in joint groove 122, joint pole 123 and joint piece 124 can make second sliding block 120 can not slide in second sliding tray 119 inside, the stability of protective screen cover 121 has been improved, when the staff will take off protective screen cover 121 clean, to extracting joint pole 123 from joint groove 122, move protective screen cover 121 to one side again, make second sliding block 120 slide in second sliding tray 119 inside, just can follow second sliding tray 119 roll-off with second sliding tray 120, thereby just can take off protective screen cover 121 clean, in order to avoid influencing the ventilation effect of ventilative mouthful 117.

Further, the height of the first connecting rod 213 is 10cm, and the bottom ends of the two sides of the protection plate 214 are both arc-shaped, so that the protection plate 214 does not affect the storage box 110 to ventilate while playing a protection role.

Furthermore, both sides of the inside of the mounting groove 310 are fixedly provided with third fixed blocks 314, one side of each third fixed block 314 close to each other is provided with a third sliding groove 315, both sides of each third sliding groove 315 are slidably provided with a third sliding block 316, both sides of the movable plate 313 are fixedly connected with the third sliding blocks 316, the movable plate 313 moves while the third sliding blocks 316 slide in the third sliding grooves 315, so that the effect of assisting the movable plate 313 to move is achieved, the stability of the movable plate 313 during moving is improved, and therefore a worker can conveniently operate the pressing plate 320.

Further, the top of extension rod 319 extends to the top of plummer 115, and the diameter ratio of extension rod 319 is 1mm less than the diameter of ejecting groove 317, and the interval between ejecting groove 317 and the extension rod 319 is less, has guaranteed that ejecting groove 317 is inside comparatively stable at extension rod 319 to the staff of being more convenient for operates pressure strip 320.

Furthermore, the bottom end of the pressing plate 320 is fixedly provided with two blocking plates 323, the number of the blocking plates 323 is two, the height of the blocking plates 323 is smaller than that of the extension rod 319, the length of the blocking plates 323 is smaller than that of the protection pad 322, and the blocking plates 323 are prevented from being placed in a skew position, so that the handkerchief paper cannot fall off from the bearing platform 115.

Furthermore, a protection pad 322 is fixedly installed at the bottom end of the pressing plate 320, the cross-sectional area of the protection pad 322 is smaller than that of the pressing plate 320, and the protection pad 322 is made of rubber materials and has certain flexibility, so that handkerchief paper placed on the bearing table 115 cannot be damaged.

The working principle is as follows: during the use, start ventilation fan 212 work, ventilation fan 212 during operation can be bloied storage box 110 is inside, and the ventilative mouthful 117 of wind accessible that ventilation fan 212 blew out, make the inside air flow rate of storage box 110 accelerate, ventilative mouthful 117 and ventilation groove 211 have played good ventilation effect, make the inside dry environment that continuously keeps of storage box 110, handkerchief paper has been solved and is accomodating the in-process, because storage time is longer, can not make storage space keep dry ventilation's effect, lead to the containing box when storing handkerchief paper, handkerchief paper wets easily, be unfavorable for subsequent packing and the problem of selling. The effect that shelters from the dust can be played to head rod 213 and guard plate 214 to guaranteed that can not have accumulated the dust on the inside handkerchief paper of storage box 110, and head rod 213 highly higher, and the both sides of guard plate 214 are the arc form, can not influence storage box 110 when having played the safeguard effect and ventilate, improved the practicality of device main part 100. The protective mesh cover 121 plays a protective role, so that the air vent 117 is not blocked due to dust accumulation, meanwhile, the dust is prevented from entering the storage box body 110 from the ventilation opening 117, the ventilation of the ventilation opening 117 is not affected while the protective mesh enclosure 121 plays a dustproof role, the clamping rod 123 is inserted into the clamping groove 122, the clamping groove 122, the clamping rod 123 and the clamping block 124 can prevent the second sliding block 120 from sliding in the second sliding groove 119, so that the stability of the protective mesh cover 121 is improved, when the worker wants to remove the protective screen 121 for cleaning, the clamping rod 123 is pulled out from the clamping groove 122, and the protective screen 121 is moved to one side, so that the second sliding block 120 slides in the second sliding groove 119, and the second sliding block 120 can slide out from the second sliding groove 119, therefore, the protective mesh cover 121 can be taken down for cleaning, so as to avoid influencing the ventilation effect of the ventilation opening 117.

When a worker places handkerchief paper, the pulling handle 321 is held, the pressing plate 320 is lifted upwards, the pressing plate 320 moves upwards, the pressing plate 320 drives the extension rod 319 and the second connecting rod 318 to move upwards, the second connecting rod 318 drives the movable plate 313 to move upwards, so that the length of the tensioning spring 312 is gradually increased, at the moment, the tensioning spring 312 generates tension, the handkerchief paper to be stored is placed at the bottom end of the pressing plate 320, the pulling handle 321 is released, at the moment, the tension of the tensioning spring 312 acts on the movable plate 313, the movable plate 313 moves downwards, the movable plate 313 drives the second connecting rod 318 and the extension rod 319 to move downwards, so that the pressing plate 320 can move downwards, the top end of the pressing plate 320 can tightly press the placed handkerchief paper, the handkerchief paper can be stably stored in the storage box 110, and the ventilating fan 212 is prevented from blowing the handkerchief paper during work, the practicability of the apparatus main body 100 is improved. When the movable plate 313 moves, the third sliding block 316 slides in the third sliding groove 315, so that the effect of assisting the movement of the movable plate 313 can be achieved, and the stability of the movable plate 313 in moving is improved, so that a worker can operate the pressing plate 320 conveniently, the distance between the ejection groove 317 and the extension rod 319 is small, the ejection groove 317 is ensured to be stable in the extension rod 319, and the worker can operate the pressing plate 320 conveniently.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A handkerchief paper is with storage device who has dampproofing mechanism, includes device main part (100), its characterized in that: the device main body (100) comprises a storage box body (110), first fixed blocks (111) are fixedly mounted on two sides of the interior of the storage box body (110), first sliding grooves (112) are formed in one sides, close to each other, of the first fixed blocks (111), first sliding blocks (113) are slidably mounted in the first sliding grooves (112), connecting blocks (114) are fixedly connected to one sides, close to each other, of the first sliding blocks (113), bearing tables (115) are fixedly connected between the connecting blocks (114), a sealing door (116) is movably mounted on the front surface of the storage box body (110) through hinges, vent holes (117) are formed in the front surface of the bottom end of the sealing door (116), a ventilation assembly (200) is mounted at the top end of the storage box body (110), the ventilation assembly (200) comprises a first mounting plate (210), one side of the first mounting plate (210) is fixedly connected with one side of the interior of the storage box body (110), the ventilation groove (211) have been seted up on the top of storage box (110), the top fixed mounting of first mounting panel (210) has ventilating fan (212), the both sides on storage box (110) top all the stationary phase even have head rod (213), the top fixed mounting of head rod (213) has guard plate (214).

2. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 1, wherein: the top of plummer (115) is installed and is compressed tightly subassembly (300), compress tightly subassembly (300) including mounting groove (310), the inside in plummer (115) is seted up in mounting groove (310), the inside bottom fixed mounting of mounting groove (310) has second mounting panel (311), the taut spring (312) of top fixedly connected with of second mounting panel (311), the top fixed mounting of taut spring (312) has fly leaf (313), liftout groove (317) have been seted up on the top of plummer (115), the top fixedly connected with second connecting rod (318) of fly leaf (313), the top fixed phase of second connecting rod (318) even has extension rod (319), the top fixed mounting of extension rod (319) has pressure strip (320), the top fixedly connected with of pressure strip (320) draws and takes (321).

3. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 1, wherein: the front face of the sealing door (116) close to the ventilation opening (117) is fixedly provided with two second fixed blocks (118), the front faces of the second fixed blocks (118) are provided with second sliding grooves (119), second sliding blocks (120) are arranged inside the second sliding grooves (119) in a sliding mode, and the front faces of the second sliding blocks (120) are fixedly connected with a protective mesh enclosure (121).

4. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 3, wherein: joint groove (122) have been seted up on the top of second fixed block (118), joint pole (123) have all been inserted to the inside in joint groove (122), the top fixedly connected with joint piece (124) of joint pole (123).

5. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 1, wherein: the height of the first connecting rod (213) is 10cm, and the bottom ends of two sides of the protection plate (214) are both arc-shaped.

6. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 2, wherein: the inside both sides of mounting groove (310) are fixed mounting all have third fixed block (314), third sliding tray (315) have all been seted up to one side that third fixed block (314) are close to each other, the inside all slidable mounting of third sliding tray (315) has third sliding block (316), the both sides of fly leaf (313) all with third sliding block (316) fixed connection.

7. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 2, wherein: the top end of the extension rod (319) extends to the top of the bearing table (115), and the diameter of the extension rod (319) is 1mm smaller than that of the ejection groove (317).

8. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 2, wherein: the bottom end fixed mounting of pressure strip (320) has stop plate (323), the quantity of stop plate (323) is two, the height that highly is less than extension rod (319) of stop plate (323), the length of stop plate (323) is less than the length of protection pad (322).

9. The storage device with the moisture-proof mechanism for handkerchief paper according to claim 2, wherein: the bottom end of the pressure plate (320) is fixedly provided with a protective pad (322), and the cross sectional area of the protective pad (322) is smaller than that of the pressure plate (320).