Breathable film printing quality detector
By designing a breathable film printing quality tester, the automatic clamping and cutting of the breathable film is achieved by using components such as limiting parts and locking parts, which solves the problem of cumbersome detection methods and improves the detection efficiency and convenience.
Patent Information
- Application Number
- CN202421005336.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The existing air permeable membrane quality inspection methods are cumbersome and require staff to disassemble and assemble repeatedly, resulting in a large workload and is inconvenient for the inspection of long samples.
A breathable film printing quality detection machine is designed, including a bottom plate, a top plate and a fixing assembly. Through the combination of limiting parts, locking parts, resetting parts, synchronizing parts and cutting parts, automatic clamping, cutting and detection of the breathable film is achieved.
It reduces the amount of operation of staff during the inspection process, improves the detection efficiency, facilitates rapid detection of samples when there are many samples, and retains complete samples for subsequent use.
Smart Images

Figure CN222652795U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of breathable films, in particular to a breathable film printing quality inspection machine. Background Art
[0002] Breathable film is a non-woven fabric specially used for rice. It is a new and efficient covering material made of hot-pressed polypropylene fiber. It has the characteristics of heat preservation, breathability, anti-condensation, corrosion resistance and durability. However, we found in real life that the existing breathable film often needs to be quality tested for its air permeability after being printed. But the existing way of quality testing of breathable film is that the staff first cuts off a piece of breathable film, and then places the cut breathable film in the detector, and then presses the breathable film with screws, rubber pads and pressing plates. The whole operation process is very cumbersome. If there are many breathable film samples to be tested, the staff needs to disassemble and assemble repeatedly, which brings great inconvenience to the staff. For this reason, we propose a breathable film printing quality inspection machine. Utility Model Content
[0003] A technical problem to be solved by the present application is: how to reduce the workload of staff when conducting breathable membrane quality inspection.
[0004] In order to solve the above technical problems, the embodiment of the present application provides a breathable film printing quality inspection machine, including a detection machine body and a ventilation pipe arranged on one side thereof for ventilation, and also includes
[0005] A bottom plate, arranged at one end of the ventilation pipe away from the detection machine body, for placing a breathable membrane;
[0006] A top plate, arranged above the bottom plate, and used to cooperate with the bottom plate to clamp the breathable membrane;
[0007] The fixing assembly is arranged in the bottom plate, and the fixing assembly is used to control the top plate to fit with the bottom plate, so as to drive the top plate to cooperate with the bottom plate to clamp and fix the breathable membrane.
[0008] In some embodiments, the fixing assembly includes a limit member arranged below the top plate, and the limit member is used to control the movement trajectory of the top plate when it is raised or lowered; a locking member is arranged in the bottom plate, and the locking member is used to control the fixing of the lowered position of the top plate; a reset member is arranged in the bottom plate, and the reset member is used to control the reset of the top plate after being pressed down; synchronization members are arranged on both sides of the bottom plate, and the synchronization members are used to control the synchronous movement of the reset members; a cutting member is arranged below the top plate, and the breathable membrane is cut by the cutting member.
[0009] In some embodiments, the limiting member includes limiting plates arranged at the four corners of the top plate, and the four limiting plates are all located at the bottom of the top plate, the bottom plate is provided with limiting grooves used in conjunction with the four limiting plates, and the four limiting plates are all slidably arranged in the corresponding limiting grooves, limiting springs are arranged at the bottom of the four limiting plates, and the bottoms of the four limiting springs are all arranged in the corresponding limiting grooves.
[0010] In some embodiments, the locking member includes two rotating rods rotatably arranged in the base plate, gears are arranged at both ends of the two rotating rods, racks meshing with the four gears are arranged on the four limiting plates, ratchets are arranged at both ends of the two rotating rods, and the four ratchets are located on the outsides of the four gears, four gear shafts are rotatably arranged in the base plate, ratchets are arranged on the outsides of the four gear shafts, and the four ratchets are used in conjunction with adjacent ratchets.
[0011] In some embodiments, the reset member includes torsion springs respectively arranged on the outside of the four gear shafts, the ends of the four torsion springs away from the gear shafts are arranged on the bottom plate, and the ends of the four gear shafts away from the four ratchet teeth are arranged with reset plates.
[0012] In some embodiments, the synchronization component includes a sliding rod arranged on the side of the four reset plates away from the four gear shafts, synchronization rods are arranged on both sides of the base plate, sliding grooves for cooperating with the four sliding rods are opened at both ends of the two synchronization rods, and the four sliding rods are slidably arranged in adjacent sliding grooves, and synchronization handles are arranged on the back sides of the two synchronization rods.
[0013] In some embodiments, the cutting element includes a rubber ring arranged at the bottom of the top plate, a blade is arranged at the top of the top plate, and the blade is located outside the rubber ring, and a knife groove for use with the blade is opened on the top of the bottom plate.
[0014] In some embodiments, a cleaning piece is provided on the bottom plate, and the cleaning piece is used to clean the discarded breathable membrane on the bottom plate. The cleaning piece includes a plurality of cleaning grooves opened on the bottom plate, two auxiliary grooves are opened in the bottom plate, and the two auxiliary grooves are communicated with adjacent cleaning grooves, auxiliary plates are slidably provided in the two auxiliary grooves, connecting plates are provided on the tops of the two auxiliary plates, the two connecting plates are slidably provided in the bottom plate, and the tops of the two connecting plates are provided on the bottom of the top plate, auxiliary springs are provided on the bottoms of the two auxiliary plates, and the ends of the two auxiliary springs away from the two auxiliary plates are provided in the auxiliary grooves.
[0015] The utility model has at least the following beneficial effects:
[0016] When in use, when the staff puts the breathable membrane between the bottom plate and the top plate, by pressing the top plate, the rubber ring and the blade at the bottom of the top plate will drop along with the top plate. When the rubber ring contacts the breathable membrane, it will fix the position of the breathable membrane. Then continue to press the top plate, the rubber ring will shrink under the action of pressure, causing the blade to cut the breathable membrane, so that the complete sample is retained on the top of the bottom plate, which is convenient for detection and sample retention. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 This is a schematic diagram of the structure of the fixed component of the utility model;
[0019] Figure 3 This is a partial cross-sectional diagram of the bottom plate structure of the utility model;
[0020] Figure 4 For this utility model Figure 3 A schematic diagram of the enlarged structure of area A;
[0021] Figure 5 This is an exploded schematic diagram of the cutting piece structure of the utility model;
[0022] Figure 6 This is a partial structural diagram of the locking member of the utility model;
[0023] Figure 7 This is a schematic diagram of the structure of the synchronous component of the utility model;
[0024] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;
[0025] Fig. 9 It is a schematic diagram of the structure of the cleaning piece of the utility model.
[0026] In the figure: 1-detection machine body; 2-ventilation pipe; 3-bottom plate; 4-top plate; 5-fixing assembly; 6-limiting member; 61-limiting plate; 62-limiting groove; 63-limiting spring; 7-locking member; 71-rotating rod; 72-gear; 73-rack; 74-ratchet; 75-gear shaft; 76-ratchet; 8-reset member; 81-torsion spring; 82-reset plate; 9-synchronizing member; 91-sliding rod; 92-synchronizing rod; 93-sliding groove; 94-synchronizing handle; 10-cutting member; 101-rubber ring; 102-blade; 103-knife groove; 11-cleaning member; 111-cleaning groove; 112-auxiliary groove; 113-auxiliary plate; 114-connecting plate; 115-auxiliary spring. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] Example 1, please refer to Figure 1-7 The utility model provides a technical solution: a breathable film printing quality inspection machine, including a detection machine body 1 and a ventilation pipe 2 for ventilation arranged on one side thereof, and also includes
[0029] A bottom plate 3 is arranged at one end of the ventilation pipe 2 away from the detection machine body 1 and is used to place a breathable membrane;
[0030] The top plate 4 is arranged above the bottom plate 3 and is used to cooperate with the bottom plate 3 to clamp the breathable membrane;
[0031] The fixing assembly 5 is arranged in the bottom plate 3 , and is used to control the top plate 4 to fit with the bottom plate 3 , so that the top plate 4 cooperates with the bottom plate 3 to clamp and fix the breathable membrane.
[0032] The fixing assembly 5 includes a limit member 6 arranged below the top plate 4, and the limit member 6 is used to control the movement trajectory of the top plate 4 when it is raised or lowered. A locking member 7 is arranged in the bottom plate 3, and the locking member 7 is used to control the fixing of the lowered position of the top plate 4. A reset member 8 is arranged in the bottom plate 3, and the reset member 8 is used to control the top plate 4 to be reset after being pressed down. Synchronous members 9 are arranged on both sides of the bottom plate 3, and the synchronous movement of the reset member 8 is controlled by the synchronizer 9. A cutting member 10 is arranged below the top plate 4, and the breathable membrane is cut by the cutting member 10.
[0033] The limiting member 6 includes limiting plates 61 arranged at the four corners of the top plate 4, and the four limiting plates 61 are all located at the bottom of the top plate 4. Limiting grooves 62 used in conjunction with the four limiting plates 61 are opened in the bottom plate 3, and the four limiting plates 61 are all slidably arranged in the corresponding limiting grooves 62. Limiting springs 63 are arranged at the bottom of the four limiting plates 61, and the bottoms of the four limiting springs 63 are all arranged in the corresponding limiting grooves 62. When the top plate 4 moves downward, the top plate 4 will drive the limiting plates 61 at the bottom to move, so that the limiting plates 61 slide in the limiting grooves 62. The limiting springs 63 arranged at the bottom of the limiting plates 61 will control the limiting plates 61 to reset after the top plate 4 loses the downward pressure, thereby resetting the top plate 4 at the top of the limiting plates 61. Its function is to limit the top plate 4 through the limiting plates 61 and the limiting grooves 62 when the top plate 4 is raised or lowered.
[0034] The locking member 7 includes two rotating rods 71 rotatably arranged in the bottom plate 3, gears 72 are arranged at both ends of the two rotating rods 71, racks 73 meshing with the four gears 72 are arranged on the four limiting plates 61, ratchets 74 are arranged at both ends of the two rotating rods 71, and the four ratchets 74 are located on the outside of the four gears 72, four gear shafts 75 are rotatably arranged in the bottom plate 3, ratchets 76 are arranged on the outside of the four gear shafts 75, and the four ratchets 76 are used in conjunction with adjacent ratchets 74. When the limiting plate 61 slides in the limiting groove 62 under the action of the top plate 4, the limiting plate 61 will drive the rack 73 on one side thereof to move together. When the rack 73 moves, the rack When gear 72 rotates, rotating rod 71 arranged at its axis will rotate together with gear 72. When rotating rod 71 rotates, it will drive ratchet 74 on its outer side, so that ratchet 74 rotates along with gear 72. At this time, the rotating ratchet 74 will lift up the ratchet teeth 76. When the staff releases the pressure applied to the top plate 4, the ratchet teeth 76 will jam the ratchet 74, making it unable to rotate, thereby fixing the lowered position of the top plate 4. Its function is to fix the lowered position of the top plate 4, so that the top plate 4 can cooperate with the bottom plate 3 to clamp the breathable membrane.
[0035] The reset member 8 includes torsion springs 81 respectively arranged on the outside of the four gear shafts 75, and the ends of the four torsion springs 81 away from the gear shafts 75 are all arranged on the bottom plate 3. The ends of the four gear shafts 75 away from the four ratchet teeth 76 are all provided with reset plates 82. When the sliding rod 91 is squeezed, the sliding rod 91 will drive the reset plate 82 to move together, so that the end of the reset plate 82 close to the gear shaft 75 rotates with the gear shaft 75 as the axis. When the gear shaft 75 rotates, the ratchet teeth 76 arranged on the outside thereof will rotate with the gear shaft 75, thereby causing the ratchet teeth 76 to break away from the control of the ratchet wheel 74. The torsion spring 81 arranged on the outside of the gear shaft 75 can reset the control gear shaft 75 when the staff releases the pressure on the synchronization handle 94. Its function is to release the control of the ratchet wheel 74 by the ratchet teeth 76 when necessary, thereby allowing the top plate 4 to reset in time.
[0036] The synchronous member 9 includes a sliding rod 91 arranged on the side of the four reset plates 82 away from the four gear shafts 75, and synchronous rods 92 are arranged on both sides of the bottom plate 3. Both ends of the two synchronous rods 92 are provided with sliding grooves 93 used in conjunction with the four sliding rods 91, and the four sliding rods 91 are slidably arranged in adjacent sliding grooves 93, and synchronous handles 94 are arranged on the opposite sides of the two synchronous rods 92. When the test is completed and the sample needs to be taken out, the two synchronous handles 94 are pressed to move the synchronous handles 94 downward. When the synchronous handles 94 move downward, the synchronous rod 92 on one side thereof will move downward. When the synchronous rod 92 moves downward, the sliding grooves 93 opened at both ends thereof will move together with the synchronous rod 92, so that the sliding rod 91 slidingly arranged in the sliding grooves 93 is squeezed, and its function is to drive the two ratchet teeth 76 to contact the control of the adjacent ratchet wheels 74 at the same time through the synchronous rod 92.
[0037] The cutting piece 10 includes a rubber ring 101 arranged at the bottom of the top plate 4, a blade 102 is arranged on the top of the top plate 4, and the blade 102 is located on the outside of the rubber ring 101, and a knife groove 103 used in conjunction with the blade 102 is opened on the top of the bottom plate 3. When the top plate 4 descends, the rubber ring 101 arranged at its bottom will descend together with the top plate 4 until the bottom of the rubber ring 101 contacts the breathable membrane on the bottom plate 3. When the staff continues to squeeze the top plate 4, the rubber ring 101 will begin to compress and fix the breathable membrane. At this time, the blade 102 arranged at the bottom of the top plate 4 will enter the knife groove 103 opened on the bottom plate 3 and cut the breathable membrane. Its function is to retain a regular sample at the breathable membrane detection part and fix the breathable membrane through the rubber ring 101.
[0038] When in use, when the staff needs to perform a breathable test on the breathable film after printing, the breathable film is first placed between the bottom plate 3 and the top plate 4, and then the top plate 4 is pressed downward. When the top plate 4 is downward, the top plate 4 will drive the bottom limit plate 61 to move, so that the limit plate 61 slides in the limit groove 62. The limit spring 63 arranged at the bottom of the limit plate 61 will control the limit plate 61 to reset after the top plate 4 loses the downward pressure, so that the top plate 4 at the top of the limit plate 61 is reset. When the limit plate 61 slides in the limit groove 62 under the action of the top plate 4, the limit plate 61 will drive the rack 73 on one side thereof to move together. When the rack 73 moves, the rack 73 will cause the gear 72 meshing with it to rotate. When gear 72 rotates, rotating rod 71 arranged at its axis will rotate together with gear 72. When rotating rod 71 rotates, it will drive ratchet 74 on its outer side, so that ratchet 74 rotates together with gear 72. At this time, the rotating ratchet 74 will lift up the ratchet teeth 76. When the staff releases the pressure applied to the top plate 4, the ratchet teeth 76 will jam the ratchet 74, making the ratchet 74 unable to rotate, thereby fixing the descending position of the top plate 4. When the top plate 4 descends, the rubber ring 101 arranged at its bottom will descend together with the top plate 4 until the bottom of the rubber ring 101 contacts the breathable membrane on the bottom plate 3. When the staff continues to squeeze the top plate 4 , the rubber ring 101 will begin to compress and fix the breathable membrane. At this time, the blade 102 set at the bottom of the top plate 4 will enter the knife groove 103 opened on the bottom plate 3 and cut the breathable membrane. When the breathable membrane is fixed by the rubber ring 101, the detection machine body 1 is controlled to make the detection machine body 1 detect the breathable membrane through the ventilation pipe 2. When the detection is completed and the sample needs to be taken out, the two synchronous handles 94 are pressed to move the synchronous handle 94 downward. When the synchronous handle 94 moves downward, it will drive the synchronous rod 92 on one side to move downward. When the synchronous rod 92 moves downward, the sliding grooves 93 opened at both ends of it will move with the synchronous rod 92, so that the sliding device The sliding rod 91 placed in the sliding groove 93 is squeezed. When the sliding rod 91 is squeezed, the sliding rod 91 will drive the reset plate 82 to move together, so that one end of the reset plate 82 close to the end of the gear shaft 75 rotates with the gear shaft 75 as the axis. When the gear shaft 75 rotates, the ratchet 76 arranged on the outside thereof will rotate along with the gear shaft 75, thereby causing the ratchet 76 to break away from the control of the ratchet wheel 74. The torsion spring 81 arranged on the outside of the gear shaft 75 can control the gear shaft 75 to reset when the staff releases the pressure on the synchronization handle 94. At this time, the limit spring 63 will control the limit plate 61 to move upward, so that the top plate 4 follows the limit plate 61 upward, so that the top plate 4 is reset, and then the breathable membrane is taken out.
[0039] Example 2, please refer to Figure 8 , Fig. 9 , the utility model provides a technical solution:
[0040] Different from the embodiment 1, a cleaning member 11 is provided on the bottom plate 3, and the cleaning member 11 is used to clean the waste breathable film on the bottom plate 3. The cleaning member 11 includes a plurality of cleaning grooves 111 opened on the bottom plate 3, and two auxiliary grooves 112 are opened in the bottom plate 3, and the two auxiliary grooves 112 are communicated with the adjacent cleaning grooves 111, and auxiliary plates 113 are slidably arranged in the two auxiliary grooves 112, and connecting plates 114 are arranged on the top of the two auxiliary plates 113. The two connecting plates 114 are slidably arranged in the bottom plate 3, and the tops of the two connecting plates 114 are arranged on the bottom of the top plate 4, and auxiliary springs 115 are arranged on the bottom of the two auxiliary plates 113. The ends of the two auxiliary springs 115 away from the two auxiliary plates 113 are arranged in the auxiliary grooves 112. When the top plate 4 moves downward, the top plate 4 will drive its bottom The two connecting plates 114 move downward together, so that the two connecting plates 114 control the auxiliary plate 113 to slide in the auxiliary groove 112. When the auxiliary plate 113 slides downward in the auxiliary groove 112, the air will enter the auxiliary groove 112 through the cleaning groove 111. At this time, the cleaning groove 111 will adsorb the breathable membrane above the bottom plate 3 on the bottom plate 3, thereby preliminarily fixing the position of the breathable membrane on the bottom plate 3. When the detection is completed and the top plate 4 moves upward, the connecting plate 114 will drive the auxiliary plate 113 to move upward, so that the auxiliary plate 113 slides in the auxiliary groove 112, and the air in the auxiliary groove 112 is discharged from the cleaning groove 111. The discharged air will blow away the discarded breathable membrane cut by the blade 102 from the bottom plate 3, making it convenient for the staff to take out the breathable membrane sample.
[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A breathable film printing quality inspection machine, comprising an inspection machine body (1) and a ventilation pipe (2) arranged on one side thereof for ventilation, characterized in that: Also includes A bottom plate (3) is arranged at one end of the ventilation pipe (2) away from the detection machine body (1) and is used for placing a breathable membrane; A top plate (4) is arranged above the bottom plate (3) and is used to cooperate with the bottom plate (3) to clamp the breathable membrane; A fixing component (5) is arranged inside the bottom plate (3), and the fixing component (5) is used to control the top plate (4) to fit with the bottom plate (3), so as to drive the top plate (4) to cooperate with the bottom plate (3) to clamp and fix the breathable membrane.
2. The breathable film printing quality inspection machine according to claim 1, characterized in that: The fixing assembly (5) comprises a limiting member (6) arranged below the top plate (4), and the limiting member (6) is used to control the movement trajectory of the top plate (4) when it is raised or lowered; a locking member (7) is arranged inside the bottom plate (3), and the locking member (7) is used to control the fixing of the descending position of the top plate (4); a reset member (8) is arranged inside the bottom plate (3), and the reset member (8) is used to control the top plate (4) to reset after being pressed down; synchronization members (9) are arranged on both sides of the bottom plate (3), and the synchronization members (9) are used to control the synchronous movement of the reset member (8); a cutting member (10) is arranged below the top plate (4), and the cutting member (10) is used to cut the breathable membrane.
3. The breathable film printing quality inspection machine according to claim 2, characterized in that: The limiting member (6) comprises limiting plates (61) arranged at four corners of the top plate (4), and the four limiting plates (61) are all located at the bottom of the top plate (4); limiting grooves (62) for use with the four limiting plates (61) are opened in the bottom plate (3), and the four limiting plates (61) are all slidably arranged in the corresponding limiting grooves (62); limiting springs (63) are arranged at the bottom of the four limiting plates (61), and the bottoms of the four limiting springs (63) are all arranged in the corresponding limiting grooves (62).
4. The breathable film printing quality inspection machine according to claim 3, characterized in that: The locking member (7) comprises two rotating rods (71) rotatably arranged in the base plate (3), gears (72) are arranged at both ends of the two rotating rods (71), racks (73) meshing with the four gears (72) are arranged on the four limiting plates (61), ratchets (74) are arranged at both ends of the two rotating rods (71), and the four ratchets (74) are located outside the four gears (72), four gear shafts (75) are rotatably arranged in the base plate (3), ratchets (76) are arranged outside the four gear shafts (75), and the four ratchets (76) are used in conjunction with adjacent ratchets (74).
5. The breathable film printing quality inspection machine according to claim 4, characterized in that: The reset member (8) comprises torsion springs (81) respectively arranged on the outside of the four gear shafts (75); one end of the four torsion springs (81) away from the gear shafts (75) is arranged on the bottom plate (3); and one end of the four gear shafts (75) away from the four ratchet teeth (76) is provided with a reset plate (82).
6. The breathable film printing quality inspection machine according to claim 5, characterized in that: The synchronization member (9) comprises a sliding rod (91) arranged on one side of the four reset plates (82) away from the four gear shafts (75), synchronization rods (92) are arranged on both sides of the base plate (3), sliding grooves (93) for use with the four sliding rods (91) are opened at both ends of the two synchronization rods (92), and the four sliding rods (91) are slidably arranged in adjacent sliding grooves (93), and synchronization handles (94) are arranged on opposite sides of the two synchronization rods (92).
7. The breathable film printing quality inspection machine according to claim 6, characterized in that: The cutting member (10) comprises a rubber ring (101) arranged at the bottom of the top plate (4); a blade (102) is arranged at the top of the top plate (4), and the blade (102) is located outside the rubber ring (101); and a knife groove (103) for use with the blade (102) is opened at the top of the bottom plate (3).
8. The breathable film printing quality inspection machine according to claim 7, characterized in that: A cleaning piece (11) is provided on the bottom plate (3), and the cleaning piece (11) is used to clean the waste breathable membrane on the bottom plate (3). The cleaning piece (11) comprises a plurality of cleaning grooves (111) provided on the bottom plate (3). Two auxiliary grooves (112) are provided in the bottom plate (3), and the two auxiliary grooves (112) are communicated with adjacent cleaning grooves (111). Auxiliary plates (113) are slidably provided in the two auxiliary grooves (112). Connecting plates (114) are provided at the tops of the two auxiliary plates (113). The two connecting plates (114) are slidably provided in the bottom plate (3), and the tops of the two connecting plates (114) are provided at the bottoms of the top plate (4). Auxiliary springs (115) are provided at the bottoms of the two auxiliary plates (113), and the ends of the two auxiliary springs (115) away from the two auxiliary plates (113) are provided in the auxiliary grooves (112).