CN113397866B - A preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device - Google Patents

Abstract

The invention relates to the technical field of medical equipment, and discloses a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device, comprising a casing, a linkage mechanism, a moving mechanism and a vibration mechanism. The linkage mechanism is movably connected, and the linkage mechanism is used to control the connection of the circuit inside the casing, and the moving mechanism is movably connected to the outer side of the casing. The preventive stoma patient enema combined with anal lavage and pelvic floor muscle training sitz bath device controls the movement of the moving mechanism through the connection and disconnection of the internal circuit of the linkage mechanism, and prevents the bed body from shaking during the process of continuously moving the patient , to prevent the frictional force on the bottom roller of the bed from being reduced, to avoid the movement of the roller at the bottom of the bed, to prevent the side of the bed from moving, and to move the medical bed when the medical staff is moving the bed. The moving speed of the bed is too fast to avoid bumps to the patient and relieve the pain of the patient.

Description

A preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device

technical field

The invention relates to the technical field of medical equipment, in particular to a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device.

Background technique

Enema is to pour liquid into the anus. When the liquid reaches a certain amount in the body, the human body begins to have the desire to defecate. The liquid poured into the body will mix with the feces in the body, and then the feces in the body will be excreted from the body. The feces will be excreted from the body. For stoma patients, it is necessary to perform anal enema, perfusion with warm water, pelvic floor muscle training and sitz bath. The existing medical beds of this type may move sideways during use, which causes the bed body to be tilted.

During the use of the existing medical bed, the method of increasing friction is used to make the medical bed in a static state. During the process of continuously moving the patient, the bed body shakes, which reduces the frictional force on the rollers at the bottom of the bed body. The roller at the bottom of the bed moves, causing the bed to move sideways. At the same time, when the medical staff moves the medical bed, because the medical staff pushes too much on the bed, the medical bed will move too fast, which will cause bumps to the patient. increase the suffering of the patient.

Therefore, we propose a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device to solve the above problems.

SUMMARY OF THE INVENTION

(1) Technical scheme

In order to achieve the above-mentioned process of continuously moving the patient, the bed body is prevented from shaking, the friction force on the rollers at the bottom of the bed body is reduced, the rollers at the bottom of the bed body are prevented from moving, and the bed body is prevented from shifting sideways. The bed, when the thrust of the medical staff to the bed body is too large, to prevent the moving speed of the medical bed from being too fast, to avoid causing bumps to the patient, and to relieve the pain of the patient, the present invention provides the following technical scheme: a preventive stoma patient An enema combined with anal lavage pelvic floor muscle training sitz bath device, including a shell, a linkage mechanism, a moving mechanism and a vibration mechanism, the inner wall of the shell is movably connected with the linkage mechanism, and the linkage mechanism is used to control the shell The circuit inside the body is turned on, the outside of the casing is movably connected with the moving mechanism, the moving mechanism is used to limit the movement of the casing, and the inner side of the moving mechanism is movably connected with the vibration mechanism, so The vibration mechanism is used for judging the magnitude of the centrifugal force when the casing moves.

Further, the linkage mechanism includes an electric shock mechanism, a trigger mechanism and a heat generating mechanism, the inner wall of the housing is movably connected with the electric shock mechanism, and the electric shock mechanism includes a fixed shaft, a connection groove, a limit block, a stop, A limit slot and an electric contact rail, the inner wall of the housing is fixedly connected with the fixed shaft, the inner wall of the fixed shaft is provided with the connection slot, and the inner wall of the connection slot is elastically connected with the limit block, The inner wall of the housing and the outer side of the fixed shaft are movably connected with the stopper, the inner wall of the stopper is provided with the limiting groove, and the inner wall of the stopper is fixedly connected with the electric contact rail , the electric shock mechanism plays the role of connecting the circuit, and the limit block is adapted to the size of the limit slot.

Further, the inner wall of the casing is movably connected with the trigger mechanism, the trigger mechanism includes a groove, a connecting rod and an electrical contact, the inner wall of the casing is movably connected with the groove, and the groove is movably connected with the groove. The connecting rod is elastically connected with the inner wall of the connecting rod, and the electrical contact is fixedly connected with the inner wall of the connecting rod, and the electrical contact is electrically connected with the external power supply.

Further, the inner wall of the casing is movably connected with the heat generating mechanism, and the heat generating mechanism includes a vibrating rod, a chute, a metal sheet, a silicone rubber layer and a retarding piston, and the inner wall of the casing is movably connected with some parts. For the vibrating rod, the inner wall of the casing is provided with the chute, the inner wall of the chute is fixedly connected with the metal sheet, the outer side of the metal sheet is fixedly connected with the silicone rubber layer, and the sliding The retarding piston is movably connected to the inner wall of the groove, and the number of the organic silicone rubber layers is twice that of the metal sheet.

Further, the moving mechanism includes a rolling mechanism and a repulsion mechanism, the rolling mechanism is movably connected to the outer side of the housing, the rolling mechanism includes a roller and a slot, and the outer side of the housing is movably connected to the roller, The inner wall of the roller is provided with the clamping grooves, and the clamping grooves are evenly distributed on the inner wall of the roller.

Further, the repulsion mechanism is movably connected to the inner wall of the housing, the repulsion mechanism includes an electromagnet, a clamping block and a magnetic block, the inner wall of the housing is fixedly connected with the electromagnet, and the The inner wall is elastically connected with the clamping block, the inner wall of the clamping block is fixedly connected with the magnetic block, the electromagnet is electrically connected with the electric contact rail, and the electromagnet is connected to the opposite surface of the magnetic block. The magnetism is the same, the repelling mechanism is used to limit the rolling mechanism.

Further, the vibration mechanism includes an air pressure groove, a fixing block, an air plug 1 and an air plug 2, the air pressure groove is opened on the inner wall of the roller, and the fixing block is fixedly connected to the inner wall of the air pressure groove. The first air plug is elastically connected to the inner wall of the groove, the second air plug is movably connected to the inner wall of the air pressure groove, and the first air plug and the second air plug are made of rubber.

Further, the first air plug is tightly fitted with the inner wall of the air pressure groove, the second air plug is closely fitted with the inner wall of the air pressure groove, the inner side of the air pressure groove is filled with gas, and the air plug 1 The mass of is less than the mass of the gas plug II.

(2) Beneficial effects

Compared with the prior art, the present invention provides a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device, which has the following beneficial effects:

1. The preventive stoma patient enema combined with anal lavage and pelvic floor muscle training sitz bath device controls the movement of the moving mechanism through the connection and disconnection of the internal circuit of the linkage mechanism. In the process of continuously moving the patient, the bed experience is avoided. Shake, prevent the friction force on the bottom roller of the bed from being reduced, prevent the roller at the bottom of the bed from moving, and prevent the bed from moving sideways. Prevent the medical bed from moving too fast, avoid bumping the patient, and relieve the patient's pain.

2. The prophylactic stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device, through the centrifugal force generated when the rolling mechanism rotates, based on the characteristics of the silicone rubber layer as a damping material, the transmitted mechanical energy is converted into heat energy, making The increased pressure in the chute realizes the slowing effect on the nursing bed that moves too fast. The use of the silicone rubber layer realizes the recycling of materials and improves the utilization rate of resources.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a partial enlarged structural schematic diagram of part A in Fig. 1 of the present invention;

Fig. 3 is the partial enlarged structural schematic diagram of part B in Fig. 1 of the present invention;

FIG. 4 is a schematic view of the structure of the housing of the present invention.

In the figure: 1. Shell; 2. Electric shock mechanism; 3. Rolling mechanism; 4. Repulsion mechanism; 5. Triggering mechanism; 6. Heat-generating mechanism; 7. Linkage mechanism; 8. Moving mechanism; 9. Vibration mechanism; 21 , fixed shaft; 22, connecting slot; 23, limit block; 24, block; 25, limit slot; 26, electric contact rail; 31, roller; 32, card slot; 41, electromagnet; 42, card block ;43, magnet; 51, groove; 52, connecting rod; 53, electrical contact; 61, vibrating rod; 62, chute; 63, metal sheet; 64, silicone rubber layer; 65, retarding piston; 91, air pressure groove; 92, fixed block; 93, air plug one; 94, air plug two.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1:

Please refer to Figures 1-4, a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device, including a housing 1, a linkage mechanism 7, a moving mechanism 8 and a vibration mechanism 9, the inner wall of the housing 1 moves A linkage mechanism 7 is connected. The linkage mechanism 7 includes an electric shock mechanism 2, a trigger mechanism 5 and a heat generating mechanism 6. An electric shock mechanism 2 is movably connected to the inner wall of the housing 1. The electric shock mechanism 2 includes a fixed shaft 21, a connection groove 22, and a limit block. 23. The stopper 24, the limit slot 25 and the electric contact rail 26, the inner wall of the housing 1 is fixedly connected with a fixed shaft 21, the inner wall of the fixed shaft 21 is provided with a connection slot 22, and the inner wall of the connection slot 22 is elastically connected to the limit block 23 , the inner wall of the housing 1 and the outer side of the fixed shaft 21 are movably connected with a stopper 24, the inner wall of the stopper 24 is provided with a limiting slot 25, the inner wall of the stopper 24 is fixedly connected with an electric contact rail 26, and the electric contact mechanism 2 plays a role in connecting The function of connecting the circuit, the limit block 23 is adapted to the size of the limit slot 25, the inner wall of the housing 1 is movably connected with a trigger mechanism 5, and the trigger mechanism 5 includes a groove 51, a connecting rod 52 and an electrical contact 53. The inner wall of 1 is movably connected with a groove 51, the inner wall of the groove 51 is elastically connected with a connecting rod 52, and the inner wall of the connecting rod 52 is fixedly connected with an electrical contact 53, and the electrical contact 53 is electrically connected with the external power supply. A heat generating mechanism 6 is movably connected, and the heat generating mechanism 6 includes a vibrating rod 61, a chute 62, a metal sheet 63, a silicone rubber layer 64 and a retarding piston 65. The inner wall of the housing 1 is movably connected with a vibrating rod 61, and the housing 1 There is a chute 62 on the inner wall of the chute, the inner wall of the chute 62 is fixedly connected with a metal sheet 63, the outer side of the metal sheet 63 is fixedly connected with a silicone rubber layer 64, and the inner wall of the chute 62 is movably connected with a retarding piston 65, silicone rubber The number of layers 64 is twice the number of metal sheets 63, and the linkage mechanism 7 is used to control the connection of the circuit inside the casing 1;

A moving mechanism 8 is movably connected to the outer side of the housing 1. The moving mechanism 8 includes a rolling mechanism 3 and a repulsion mechanism 4. The outer side of the housing 1 is movably connected to a rolling mechanism 3. The rolling mechanism 3 includes a roller 31 and a card slot 32. The housing 1 The outer side is movably connected with a roller 31, the inner wall of the roller 31 is provided with a card slot 32, the card slot 32 is evenly distributed on the inner wall of the roller 31, the inner wall of the housing 1 is movably connected with a repulsion mechanism 4, and the repulsion mechanism 4 includes an electromagnet 41, a card Block 42 and magnetic block 43, the inner wall of the housing 1 is fixedly connected with an electromagnet 41, the inner wall of the housing 1 is elastically connected with a clamping block 42, the inner wall of the clamping block 42 is fixedly connected with a magnetic block 43, and the electromagnet 41 is connected to the electrical contact rail 26 is electrically connected, the magnetism of the opposite surfaces of the electromagnet 41 and the magnet block 43 is the same, the repulsion mechanism 4 is used to limit the rolling mechanism 3 , and the moving mechanism 8 is used to limit the movement of the housing 1 .

Embodiment 2:

Please refer to Figures 1-4, a preventive stoma patient enema combined with anal lavage pelvic floor muscle training sitz bath device, including a housing 1, a linkage mechanism 7, a moving mechanism 8 and a vibration mechanism 9, the inner wall of the housing 1 moves A linkage mechanism 7 is connected. The linkage mechanism 7 includes an electric shock mechanism 2, a trigger mechanism 5 and a heat generating mechanism 6. An electric shock mechanism 2 is movably connected to the inner wall of the housing 1. The electric shock mechanism 2 includes a fixed shaft 21, a connection groove 22, and a limit block. 23. The stopper 24, the limit slot 25 and the electric contact rail 26, the inner wall of the housing 1 is fixedly connected with a fixed shaft 21, the inner wall of the fixed shaft 21 is provided with a connection slot 22, and the inner wall of the connection slot 22 is elastically connected to the limit block 23 , the inner wall of the housing 1 and the outer side of the fixed shaft 21 are movably connected with a stopper 24, the inner wall of the stopper 24 is provided with a limiting slot 25, the inner wall of the stopper 24 is fixedly connected with an electric contact rail 26, and the electric contact mechanism 2 plays a role in connecting The function of connecting the circuit, the limit block 23 is adapted to the size of the limit slot 25, the inner wall of the housing 1 is movably connected with a trigger mechanism 5, and the trigger mechanism 5 includes a groove 51, a connecting rod 52 and an electrical contact 53. The inner wall of 1 is movably connected with a groove 51, the inner wall of the groove 51 is elastically connected with a connecting rod 52, and the inner wall of the connecting rod 52 is fixedly connected with an electrical contact 53, and the electrical contact 53 is electrically connected with the external power supply. A heat generating mechanism 6 is movably connected, and the heat generating mechanism 6 includes a vibrating rod 61, a chute 62, a metal sheet 63, a silicone rubber layer 64 and a retarding piston 65. The inner wall of the housing 1 is movably connected with a vibrating rod 61, and the housing 1 There is a chute 62 on the inner wall of the chute, the inner wall of the chute 62 is fixedly connected with a metal sheet 63, the outer side of the metal sheet 63 is fixedly connected with a silicone rubber layer 64, and the inner wall of the chute 62 is movably connected with a retarding piston 65, silicone rubber The number of layers 64 is twice the number of metal sheets 63, and the linkage mechanism 7 is used to control the connection of the circuit inside the casing 1;

A moving mechanism 8 is movably connected to the outer side of the housing 1. The moving mechanism 8 includes a rolling mechanism 3 and a repulsion mechanism 4. The outer side of the housing 1 is movably connected to a rolling mechanism 3. The rolling mechanism 3 includes a roller 31 and a card slot 32. The housing 1 The outer side is movably connected with a roller 31, the inner wall of the roller 31 is provided with a card slot 32, the card slot 32 is evenly distributed on the inner wall of the roller 31, the inner wall of the housing 1 is movably connected with a repulsion mechanism 4, and the repulsion mechanism 4 includes an electromagnet 41, a card Block 42 and magnetic block 43, the inner wall of the housing 1 is fixedly connected with an electromagnet 41, the inner wall of the housing 1 is elastically connected with a clamping block 42, the inner wall of the clamping block 42 is fixedly connected with a magnetic block 43, and the electromagnet 41 is connected to the electrical contact rail 26 is electrically connected, the magnetism of the opposite surfaces of the electromagnet 41 and the magnet block 43 is the same, the repulsion mechanism 4 is used to limit the rolling mechanism 3, and the moving mechanism 8 is used to limit the movement of the housing 1;

A vibration mechanism 9 is movably connected to the inner side of the moving mechanism 8. The vibration mechanism 9 includes an air pressure groove 91, a fixed block 92, an air plug 1 93 and an air plug 2 94. The inner wall of the roller 31 is provided with an air pressure groove 91, and the inner wall of the air pressure groove 91 is fixedly connected. There is a fixed block 92, the inner wall of the air pressure groove 91 is elastically connected with an air plug 1 93, and the inner wall of the air pressure groove 91 is movably connected with an air plug 2 94, the air plug 1 93 and the air plug 2 94 are made of rubber. The inner wall of the groove 91 is closely fitted, the gas plug 2 94 is closely fitted with the inner wall of the air pressure groove 91, the inner side of the air pressure groove 91 is filled with gas, the mass of the gas plug 1 93 is smaller than that of the gas plug 2 94, and the vibration mechanism 9 is used for Determine the magnitude of the centrifugal force when the casing 1 moves.

Working principle: During the use of the medical bed, when the medical bed is in the braking state, the medical staff steps on the electric shock mechanism 2. At this time, the linkage mechanism 7 will respond. Under the action of the stepping pressure, the stopper 24 will drive the electric shock The rail 26 rotates along the outer side of the fixed shaft 21. At this time, the limit block 23 in the fixed shaft 21 will telescopically move under the action of the pressing force of the limit groove 25. At this time, the limit block 23 will move along the connection The inner wall of the connecting groove 22 moves, when the electrical contact rail 26 is electrically connected to the electrical contact 53 in the trigger mechanism 5, the circuit connected by the electrical contact rail 26 is in a state of access, and the connecting rod 52 will follow the groove. The inner wall of 51 slides for a certain distance, and then the stepping pressure is removed. At this moment, the limit groove 25 is clamped with the limit block 23, and the stop block 24 does not move;

At the same time, the electromagnet 41 electrically connected to the electric contact rail 26 in the repulsion mechanism 4 in the moving mechanism 8 will have magnetism. Since the opposite surfaces of the electromagnet 41 and the magnet block 43 have the same magnetism, at this time, the repulsion force is Under the action, the blocking block 42 will move to the outside and engage with the blocking slot 32 in the rolling mechanism 3, so that the roller 31 and the housing 1 are relatively stationary, thereby restricting the movement of the roller 31 and preventing the roller 31 from being sideways. Move, improve the stability of nursing bed placement;

When moving the nursing bed, pull the block 24 upward until the block 24 and the shell 1 are in a vertical state. At this moment, under the action of the limit groove 25 and the limit block 23, the block 24 and the shell 1 They are relatively stationary, and at the same time, the electromagnet 41 connected to the electric contact rail 26 will lose its magnetism, so that the blocking block 42 is separated from the blocking slot 32, which is convenient for the roller 31 to roll;

When the speed of the medical staff pushing the nursing bed is too fast, the rotation speed of the roller 31 will become faster. At this time, the centrifugal force generated by the rotation of the roller 31 is relatively large. At this time, the vibration mechanism 9 will change under the action of the centrifugal force. The mass of 94 is greater than that of air plug 1 93, so the centrifugal force of air plug 2 94 is greater than that of air plug 1 93. At this time, air plug 2 94 will move inward along the air pressure groove 91, and then squeeze the air pressure groove 91. At this time, the air plug 1 93 will move to the outside along the air pressure groove 91 until the force received by the air plug 1 93 is in a balanced state. Slot 91 is disengaged;

At this time, under the action of the rotation of the roller 31, the gas plug 93 will collide with the vibrating rod 61 in the heat generating mechanism 6. Since the vibrating rod 61 is movably connected with the housing 1, the vibrating rod 61 will hit the metal sheet 63. When When the metal sheet 63 bends and vibrates, its vibration energy is rapidly transmitted to the silicone rubber layer 64 that is closely attached to the metal sheet 63, causing friction and mutual dislocation inside the silicone rubber layer 64 due to the internal wear of the silicone rubber layer 64. The internal friction is large, so that a considerable part of the vibration energy of the metal sheet 63 is consumed and turned into heat energy to dissipate. At this time, the temperature in the chute 62 increases, so that the pressure in the chute 62 increases, and then pushes the retarding piston 65. Moving to the outside, the retarding piston 65 will rub against the inner wall of the roller 31 at this time, thereby slowing down the rotation speed of the roller 31, preventing the medical bed from moving too fast, avoiding bumps to the patient, and alleviating the pain of the patient.

The above process is shown in FIG. 4 , which can prevent the bed from shaking during the process of continuously moving the patient, prevent the frictional force received by the roller 31 at the bottom of the bed from being reduced, prevent the roller 31 at the bottom of the bed from moving, and prevent the bed from occurring. Side shift, while the medical staff moves the medical bed, when the medical staff pushes the bed body too much, it prevents the medical bed from moving too fast, avoids bumping the patient, and relieves the patient's pain.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. The utility model provides a prophylactic stoma patient enema combines anus lavage pelvic floor muscle training hip bath device which characterized in that: the device comprises a shell (1), a linkage mechanism (7), a moving mechanism (8) and a vibrating mechanism (9), wherein the linkage mechanism (7) is movably connected to the inner wall of the shell (1), the linkage mechanism (7) is used for controlling the connection of a circuit on the inner side of the shell (1), the moving mechanism (8) is movably connected to the outer side of the shell (1), the moving mechanism (8) is used for limiting the movement of the shell (1), the vibrating mechanism (9) is movably connected to the inner side of the moving mechanism (8), and the vibrating mechanism (9) is used for judging the magnitude of centrifugal force applied to the shell (1) during movement;

the linkage mechanism (7) comprises an electric shock mechanism (2), a trigger mechanism (5) and a heat generating mechanism (6), the inner wall of the shell (1) is movably connected with the electric shock mechanism (2), the electric shock mechanism (2) comprises a fixed shaft (21), a connecting groove (22), a limiting block (23), a stop block (24), a limiting groove (25) and an electric contact rail (26), the inner wall of the shell (1) is fixedly connected with the fixed shaft (21), the inner wall of the fixed shaft (21) is provided with the connecting groove (22), the inner wall of the connecting groove (22) is elastically connected with the limiting block (23), the inner wall of the shell (1) and the outer side close to the fixed shaft (21) are movably connected with the stop block (24), the inner wall of the stop block (24) is provided with the limiting groove (25), and the inner wall of the stop block (24) is fixedly connected with the electric contact rail (26);

the inner wall of the shell (1) is movably connected with the trigger mechanism (5), the trigger mechanism (5) comprises a groove (51), a connecting rod (52) and an electric contact (53), the inner wall of the shell (1) is movably connected with the groove (51), the inner wall of the groove (51) is elastically connected with the connecting rod (52), and the inner wall of the connecting rod (52) is fixedly connected with the electric contact (53);

the inner wall of the shell (1) is movably connected with the heat generating mechanism (6), the heat generating mechanism (6) comprises a vibrating rod (61), a sliding groove (62), a metal sheet (63), an organic silicon rubber layer (64) and a retarding piston (65), the inner wall of the shell (1) is movably connected with the vibrating rod (61), the sliding groove (62) is formed in the inner wall of the shell (1), the metal sheet (63) is fixedly connected to the inner wall of the sliding groove (62), the organic silicon rubber layer (64) is fixedly connected to the outer side of the metal sheet (63), and the retarding piston (65) is movably connected to the inner wall of the sliding groove (62);

the moving mechanism (8) comprises a rolling mechanism (3) and a repelling mechanism (4), the rolling mechanism (3) is movably connected to the outer side of the shell (1), the rolling mechanism (3) comprises a roller (31) and a clamping groove (32), the roller (31) is movably connected to the outer side of the shell (1), and the clamping groove (32) is formed in the inner wall of the roller (31);

the inner wall of the shell (1) is movably connected with the rejection mechanism (4), the rejection mechanism (4) comprises an electromagnet (41), a clamping block (42) and a magnetic block (43), the electromagnet (41) is fixedly connected with the inner wall of the shell (1), the clamping block (42) is elastically connected with the inner wall of the shell (1), and the magnetic block (43) is fixedly connected with the inner wall of the clamping block (42);

the vibration mechanism (9) comprises an air pressure groove (91), a fixed block (92), a first air plug (93) and a second air plug (94), the air pressure groove (91) is formed in the inner wall of the roller (31), the fixed block (92) is fixedly connected to the inner wall of the air pressure groove (91), the first air plug (93) is elastically connected to the inner wall of the air pressure groove (91), and the second air plug (94) is movably connected to the inner wall of the air pressure groove (91);

the air plug I (93) is tightly attached to the inner wall of the air pressure groove (91), the air plug II (94) is tightly attached to the inner wall of the air pressure groove (91), the inner side of the air pressure groove (91) is filled with air, and the mass of the air plug I (93) is smaller than that of the air plug II (94).

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