CN211317598U

CN211317598U - Torque detection device

Info

Publication number: CN211317598U
Application number: CN202020131344.7U
Authority: CN
Inventors: 刘腾蛟; 刘维新
Original assignee: Shandong Hanpu Machinery Co ltd
Current assignee: Shandong Hanpu Machinery Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-08-21
Anticipated expiration: 2030-01-20

Abstract

The utility model relates to a moment of torsion check out test set field specifically is a moment of torsion detection device, including casing, input shaft, reduction gears, outer sleeve and inner skleeve, the input shaft is installed in the casing and is connected with the inner skleeve through reduction gears, the reaction arm has set firmly on the outer sleeve, the outer sleeve is connected with the casing, the calibrated scale has set firmly on the inner skleeve, be equipped with the pointer that matches with the calibrated scale on the outer sleeve. Compared with the prior art, the utility model discloses torque detection device's beneficial effect does: bolt moment of torsion detects time measuring, and the measurement accuracy requirement to nut displacement angle is not high, the utility model discloses a torque detection device passes through calibrated scale indicator nut displacement angle, can be on the basis of guaranteeing the moment of torsion detection precision reduce cost and fault rate.

Description

Torque detection device

Technical Field

The utility model relates to a moment of torsion check out test set field specifically is a moment of torsion detection device.

Background

The in-service bolt refers to a bolt fastened on a station, and according to relevant process specifications, the bolt needs to detect the torque again within a period of time after being fastened so as to ensure that the construction torque meets the specifications or the bolt is not abnormally loosened. The prior technical scheme is that a manual pointer wrench or a manual digital display wrench with torque accuracy within +/-3% is adopted, a tightening method is used for measuring bolt torque, the manual torque wrench is used for continuing tightening, when a bolt is read from static friction to dynamic friction instantly and then multiplied by a tightening ratio to obtain final tightening torque, the process needs to observe slight rotation of a sleeve and timely reads data, human factors influence more in the process, errors easily occur in the data, and under the condition of measuring large torque, a torque rod of the manual torque wrench is too long, multiple persons are required to simultaneously cooperate to operate, time and labor are wasted, a torque multiplier is generally adopted in the prior art when the condition of large torque construction is solved, but the torque multiplier does not have the function of reading the torque, and further the torque multiplier cannot be used as torque detection equipment.

CN202693183U discloses a portable torque testing device, which comprises a torque multiplier, a torque sensor is disposed on one side of the torque multiplier, a rotation angle sensor is disposed on the other side of the torque multiplier, a measurement display device is further disposed on the torque multiplier, the measurement display device comprises a microprocessor and an analog-to-digital conversion module connected with the microprocessor, the analog-to-digital conversion module is respectively connected with the torque sensor and the rotation angle sensor, the microprocessor is connected with a display module, and a storage module is connected with the microprocessor. The portable torque testing device has the following defects: (1) the corner sensor is an electronic device, so that the cost is high, dust and vibration easily cause failure of the corner sensor, and the actual use environment cannot avoid collision and a large amount of dust, so that the corner sensor often fails in actual use and has extremely poor reliability; (2) the torque testing device is very heavy (about 10 kilograms), and the portable torque testing device is not convenient to grasp and easy to lose hands and fall off due to the large outer diameter of the shell, so that potential safety hazards exist; (3) the ratchet mechanism of the existing torque multiplier is reversed by pulling a handle, a pawl and a ratchet wheel can be clamped tightly after a bolt is screwed, the pulling handle is small, finger pain is easily caused when the bolt is pulled by large force, and the reversing handle is easily blocked by a ratchet wrench and is not easy to operate; (4) the output shaft of the existing torque multiplier is connected with the sleeve through the square cone, and when the torque multiplier is used, because the number of supporting points between the output shaft and the sleeve is small, under the action of unbalance loading of a reaction arm, the axis of the output shaft is easy to deviate from the axis of the sleeve, and the detection precision is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the not enough of above-mentioned prior art, provide a torque detection device, through calibrated scale indicator nut displacement angle, can be on the basis of guaranteeing the moment of torsion detection precision reduce cost and fault rate.

The utility model discloses the technical problem that will solve adopts following technical scheme to realize: the utility model provides a torque detection device, includes casing, input shaft, reduction gears, outer sleeve and inner skleeve, the input shaft is installed in the casing and is connected with the inner skleeve through reduction gears, the reaction arm of force has set firmly on the outer sleeve, the outer sleeve is connected with the casing, the calibrated scale has set firmly on the inner skleeve, be equipped with the pointer that matches with the calibrated scale on the outer sleeve.

The technical proposal of the utility model is also that: the speed reducing mechanism comprises a primary planetary speed reducing mechanism and a secondary planetary speed reducing mechanism; the primary planetary reduction mechanism comprises a primary sun gear, a primary planet carrier and a primary gear ring, the primary sun gear is connected with the input shaft, the primary gear ring is fixedly arranged in the shell, the primary planet carrier is rotatably arranged in the shell, and the primary planet gear is arranged on the primary planet carrier and is meshed with the primary gear ring; the secondary planet speed reducing mechanism comprises a secondary sun gear, a secondary planet carrier and a secondary gear ring, the secondary sun gear is in key connection with the primary planet carrier, the secondary gear ring is fixedly arranged in the shell, the secondary planet carrier is rotatably arranged in the shell, and the secondary planet gear is arranged on the secondary planet carrier and is meshed with the secondary gear ring; the inner sleeve is in key connection with the secondary planet carrier.

The technical proposal of the utility model is also that: the outer sleeve is detachably mounted on the shell, a middle sleeve is arranged between the outer sleeve and the inner sleeve, a first limiting flange is arranged on the outer sleeve, a second limiting flange is arranged on the inner sleeve, the first limiting flange and the second limiting flange are respectively located below and above the middle sleeve, and the diameter of the first limiting flange and the diameter of the second limiting flange are smaller than the diameter of the middle sleeve. By adopting the technical scheme, the inner sleeve is respectively arranged in the shell through two supporting points of the secondary planet carrier and the middle sleeve, when the eccentric load of the reaction arm acts, the axis of the shell is not easy to deviate from the axis of the inner sleeve, the dial degree is accurate, and the torque detection precision is ensured. In addition, because the outer sleeve is detachably arranged on the shell, the inner sleeve and the outer sleeve can be replaced according to detection requirements by detaching the outer sleeve.

The technical proposal of the utility model is also that: still include stopping ratchet, stopping ratchet includes that ratchet, pawl, switching-over are dialled the circle, the pearl is dialled to the pawl and is dialled the pearl spring, ratchet and input shaft coaxial coupling, the pawl pin joint is on the casing, the both ends of pawl respectively are equipped with a stopping tooth, the rotatable cover of switching-over is dialled the circle and is established on the casing, the switching-over is dialled to be equipped with on the circle and is dialled the radial pearl sliding tray of dialling that sets up of circle along the switching-over, the pearl is dialled to the pawl and is dialled the pearl spring and locate to dial in the pearl sliding tray, the pearl is dialled to the pawl and is contacted with the pawl. By adopting the technical scheme, compared with a backstop ratchet mechanism reversing by pulling a handle in the prior art, the reversing shifting ring can not be blocked by a ratchet wrench, the hand of a detection person can be operated from any position of the reversing shifting ring, and in addition, the contact area between the reversing shifting ring and the hand is large, so that the hand pain is not easy to cause.

The technical proposal of the utility model is also that: the backstop ratchet mechanism comprises three pawls which are uniformly distributed along the circumferential direction of the ratchet. By adopting the technical scheme, the backstop function of the backstop ratchet mechanism can be realized only by meshing one pawl with the ratchet wheel, so that the lowest swing angle of the input shaft is smaller during working, and the comfort level of detection personnel can be improved.

The technical proposal of the utility model is also that: still include the handle, the handle is installed on the casing. By adopting the technical scheme, the detection personnel can grasp the handle to move the torque detection device, the detection personnel are not easy to get off the hand, and the potential safety hazard is eliminated.

The technical proposal of the utility model is also that: the handle is installed on the shell through a handle adjusting mechanism, the handle adjusting mechanism comprises a handle sleeve, a bolt and a bolt spring, the handle is fixedly connected with the handle sleeve, the handle sleeve is sleeved on the shell, a bolt sliding groove is formed in the handle and radially arranged along the handle sleeve, the bolt and the bolt spring are arranged in the bolt sliding groove, a plurality of bolt holes matched with the bolt are formed in the shell along the circumferential direction at intervals, and the bolt is inserted into the bolt holes under the action of the bolt spring. Adopt this technical scheme, stir the rotatable handle of bolt to prevent that the handle from hindering the measurement personnel operation.

The technical proposal of the utility model is also that: the device also comprises a torque sensor, an analog-to-digital conversion module, a microprocessor and a digital display module; the torque sensor is connected with the microprocessor through the analog-to-digital conversion module and used for detecting the torque of the inner sleeve and transmitting a torque signal to the microprocessor through the analog-to-digital conversion module; the microprocessor is connected with the digital display module and used for processing the torque signal detected by the torque sensor and controlling the digital display module to display the torque value.

The technical proposal of the utility model is also that: the device also comprises a key module, a buzzing module, an indicating module, a power supply module and a power supply input module; the button module, the buzzing module and the indicating module are all connected with the microprocessor, and the power supply module is connected with the microprocessor through the power supply input module.

The technical proposal of the utility model is also that: the inner sleeve is a quincuncial sleeve.

Compared with the prior art, the utility model discloses torque detection device's beneficial effect does: bolt moment of torsion detects time measuring, and the measurement accuracy requirement to nut displacement angle is not high, the utility model discloses a torque detection device passes through calibrated scale indicator nut displacement angle, can be on the basis of guaranteeing the moment of torsion detection precision reduce cost and fault rate.

Drawings

Fig. 1 is a perspective view of a torque detection device in an embodiment.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

FIG. 3 is an exploded view of the torque detection device according to the embodiment.

FIG. 4 is a main sectional view of the torque detecting device in the embodiment.

Fig. 5 is a partially enlarged view of a portion B in fig. 4.

Fig. 6 is a cross-sectional view taken along line C-C of fig. 4.

Fig. 7 is an electrical schematic diagram of the torque detection device in the embodiment.

FIG. 8 is a first diagram illustrating a state of use of the torque detecting device according to the embodiment.

FIG. 9 is a view showing a state of use of the torque detecting device according to the embodiment.

In the figure: 1. the device comprises a shell, a 2 input shaft, a 3 outer sleeve, a 4 inner sleeve, a 5 reaction arm, a 6 dial, a 7 pointer, a 8 primary sun gear, a 9 primary planet gear, a 10 primary planet carrier, a 11 primary gear ring, a 12 secondary sun gear, a 13 secondary planet gear, a 14 secondary planet carrier, a 15 secondary gear ring, a 16 intermediate sleeve, a 17 first limit flange, a 18 second limit flange, a 19 ratchet wheel, a 20 pawl, a 21 reversing dial ring, a 22 pawl dial bead, a 23 dial bead spring, a 24, a backstop tooth, a 25 dial bead sliding groove, a 26 handle, a 27 handle sleeve, a 28, a bolt, a 29, a bolt spring, a 30, a bolt sliding groove, a 31, a bolt hole, a 32, a torque sensor, a 33, an analog-to-digital conversion module, a 34, a microprocessor, a 35, a digital display module, a 36, a key module, a 37, a buzzing module, a 38, a pointer, a, Indication module 39, power module 40, power input module 41, ratchet wrench 42, rigid body 43, fastening bolt.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the following further describes the embodiments of the present invention with reference to the attached drawings.

As shown in fig. 1 to 7, a torque detection device includes a housing 1, an input shaft 2, a speed reduction mechanism, an outer sleeve 3, an inner sleeve 4, a backstop ratchet mechanism, and a handle 26.

The input shaft 2 is installed in the housing 1 and connected to the inner sleeve 4 through a speed reduction mechanism, specifically, as shown in fig. 4, the speed reduction mechanism includes a primary planetary speed reduction mechanism and a secondary planetary speed reduction mechanism. One-level planet reduction gears includes one-level sun gear 8, one-level planet wheel 9, one-level planet carrier 10 and one-level ring gear 11, one-level sun gear 8 is connected with input shaft 2, one-level ring gear 11 sets firmly in casing 1, the rotatable installation of one-level planet carrier 10 is in casing 1, one-level planet wheel 9 is installed on one-level planet carrier 10 and is meshed with one-level ring gear 11. The secondary planet reducing mechanism comprises a secondary sun gear 12, a secondary planet gear 13, a secondary planet carrier 14 and a secondary gear ring 15, the secondary sun gear 12 is connected with a primary planet carrier 10 in a key mode, the secondary gear ring 15 is fixedly arranged in the shell 1, the secondary planet carrier 14 is rotatably arranged in the shell 1, and the secondary planet gear 13 is arranged on the secondary planet carrier 14 and meshed with the secondary gear ring 15. The inner sleeve 4 is keyed with the secondary planet carrier 14.

And a reaction arm 5 is fixedly arranged on the outer sleeve 3. The outer sleeve 3 is detachably mounted on the housing 1, and specifically, as shown in fig. 1, the outer sleeve 3 is mounted on the housing 1 by fastening bolts 43.

Be equipped with middle sleeve 16 between outer sleeve 3 and the inner sleeve 4, be equipped with first spacing flange 17 on the outer sleeve, be equipped with second spacing flange 18 on the inner sleeve 4, first spacing flange 17 and second spacing flange 18 are located the below and the top of middle sleeve 16 respectively, the diameter of first spacing flange 17 and the diameter of second spacing flange 18 all are less than the diameter of middle sleeve 16.

The inner sleeve 4 is a quincuncial sleeve so as to adjust the angle of the torque detection device.

As shown in fig. 1 and 2, a dial 6 is fixedly arranged on the inner sleeve 4, the unit of the dial 6 is 1 degree, and a pointer 7 matched with the dial 6 is arranged on the outer sleeve 3. When the bolt torque is detected, the requirement on the measurement accuracy of the displacement angle of the nut is not high, and the torque detection device of the embodiment can reduce the cost and the failure rate on the basis of ensuring the torque detection accuracy by indicating the displacement angle of the nut through the dial 6.

The inner sleeve 4 is respectively installed in the shell 1 through two supporting points of the second-stage planet carrier 14 and the middle sleeve 16, when the eccentric load of the reaction arm 5 acts, the axis of the shell 1 is not easy to deviate from the axis of the inner sleeve 4, the dial is accurate in 6 degrees, and the accuracy of torque detection is guaranteed. In addition, since the outer sleeve 3 is detachably mounted on the housing 1, the inner sleeve 4 and the outer sleeve 3 can be replaced according to the detection requirement by detaching the outer sleeve 3.

As shown in fig. 6, the anti-back ratchet mechanism includes a ratchet wheel 19, a pawl 20, a reversing dial ring 21, pawl dial beads 22 and dial bead springs 23, the ratchet wheel 19 is coaxially connected with the input shaft 2, the pawl 20 is pivoted on the housing 1 and is uniformly distributed along the circumference of the ratchet wheel 19 at intervals, two ends of the pawl 20 are respectively provided with an anti-back tooth 24, the reversing dial ring 21 is rotatably sleeved on the housing 1, the reversing dial ring 21 is provided with a dial bead sliding groove 25 radially arranged along the reversing dial ring 21, the pawl dial beads 22 and the dial bead springs 23 are arranged in the dial bead sliding groove 25, and the pawl dial beads 22 are in contact with the pawl 20 under the action of the dial bead springs 23.

Compared with a backstop ratchet mechanism reversing by pulling a handle in the prior art, the reversing shifting ring 21 cannot be blocked by the ratchet wrench 41, the hand of a detection person can be operated from any position of the reversing shifting ring 21, and the hand pain is not easy to cause due to the large contact area between the reversing shifting ring 21 and the hand.

Because the backstop ratchet mechanism comprises three pawls 20 uniformly distributed along the circumferential direction of the ratchet wheel 19, the backstop function of the backstop ratchet mechanism can be realized only by meshing one pawl 20 with the ratchet wheel 19, so that the lowest swing angle of the input shaft 2 is smaller during working, and the comfort level of detection personnel can be improved.

As shown in fig. 3-5, the handle 26 is mounted on the housing 1 through a handle adjusting mechanism, the handle adjusting mechanism includes a handle sleeve 27, a plug 28 and a plug spring 29, the handle 26 is fixedly connected to the handle sleeve 27, the handle sleeve 27 is sleeved on the housing 1, the handle 26 is provided with a plug sliding groove 30 radially disposed along the handle sleeve 27, the plug 28 and the plug spring 29 are disposed in the plug sliding groove 30, the housing 1 is provided with a plurality of plug holes 31 matching with the plug 28 at intervals along the circumferential direction, and the plug 28 is inserted into the plug holes 31 under the action of the plug spring 29.

The detection personnel can grasp the handle 26 to move the torque detection device, the detection personnel are not easy to get off the hand, and the potential safety hazard is eliminated. The toggle latch 28 may rotate the handle 26 to prevent the handle 26 from obstructing the operation of the inspector.

Fig. 7 shows the electrical principle of the torque detection device in the present embodiment, and as shown in fig. 7, the torque detection device further includes a torque sensor 32, an analog-to-digital conversion module 33, a microprocessor 34, a digital display module 35, a key module 36, a buzzer module 37, an indication module 38, a power supply module 39 and a power supply input module 40. The torque sensor 32 is connected to the microprocessor 34 through an analog-to-digital conversion module 33, and the torque sensor 32 is configured to detect the torque of the inner sleeve 4 and transmit a torque signal to the microprocessor 34 through the analog-to-digital conversion module 33. The microprocessor 34 is connected with a digital display module 35, and the microprocessor 34 is used for processing the torque signal detected by the torque sensor 32 and controlling the digital display module 35 to display the torque value. The digital display module 33 of the present embodiment is a digital meter. The key module 36, the buzzer module 37 and the indication module 38 are all connected with the microprocessor 34, and the power module 39 is connected with the microprocessor 34 through the power input module 40.

The torque detection device of this embodiment can change torque unit in three, can peak value guarantor, sets up the moment of torsion alarm value, carries out audible and visual alarm through buzzing module 37 and instruction module 38 after reaching the warning moment of torsion, wherein uses peak value guarantor function when the moment of torsion detects, can snatch moment of torsion peak value, makes things convenient for the measurement personnel to read.

The working principle of the torque detection device in the embodiment is as follows: when fastening the bolt, as shown in fig. 8, the anti-backing ratchet mechanism is rotated to the R-position, the square cone of the ratchet wrench 41 is inserted into the square hole of the input shaft 2, the dial block of the ratchet wrench 41 is shifted to the right end, the ratchet wrench 41 is rotated in the direction of fig. 8, the reaction arm 5 needs to be leaned on the fixed rigid body 42, such as another bolt, when the reaction arm 5 completely leans on the other rigid body 42, the inner sleeve 4 starts to bear force, the torque is continuously applied at this time, the operator observes the dial 6, the rotation angle at this time and the rotation angle of the nut, the dial 6 rotates 1-3 degrees, the torque application is stopped immediately, and the peak torque and the torque of the bolt recorded by the digital display module 35 at this time. When the bolt is removed, as shown in fig. 9, the ratchet wrench 41 is pressed to rotate the anti-backup ratchet mechanism to the L-position, and the ratchet wrench 41 is shifted to the left end to rotate the ratchet wrench 41 in the direction of fig. 9.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A torque detection device includes a housing (1), an input shaft (2), and a speed reduction mechanism, characterized in that: still include outer sleeve (3) and inner skleeve (4), input shaft (2) are installed in casing (1) and are connected with inner skleeve (4) through reduction gears, the reaction arm of force (5) have set firmly on outer sleeve (3), outer sleeve (3) are connected with casing (1), graduated disk (6) have set firmly on inner skleeve (4), be equipped with pointer (7) that match with graduated disk (6) on outer sleeve (3).

2. The torque detection device according to claim 1, characterized in that: the speed reducing mechanism comprises a primary planetary speed reducing mechanism and a secondary planetary speed reducing mechanism; the primary planet speed reducing mechanism comprises a primary sun gear (8), a primary planet gear (9), a primary planet carrier (10) and a primary gear ring (11), the primary sun gear (8) is connected with the input shaft (2), the primary gear ring (11) is fixedly arranged in the shell (1), the primary planet carrier (10) is rotatably arranged in the shell (1), and the primary planet gear (9) is arranged on the primary planet carrier (10) and meshed with the primary gear ring (11); the secondary planet speed reducing mechanism comprises a secondary sun gear (12), a secondary planet gear (13), a secondary planet carrier (14) and a secondary gear ring (15), the secondary sun gear (12) is connected with the primary planet carrier (10) in a key mode, the secondary gear ring (15) is fixedly arranged in the shell (1), the secondary planet carrier (14) is rotatably arranged in the shell (1), and the secondary planet gear (13) is arranged on the secondary planet carrier (14) and meshed with the secondary gear ring (15); the inner sleeve (4) is in key connection with the secondary planet carrier (14).

3. The torque detection device according to claim 2, characterized in that: the utility model discloses a multi-functional sleeve, including casing (1), outer sleeve (3), inner sleeve (4), first spacing flange (17), second spacing flange (18), first spacing flange (17) and second spacing flange (18) are located the below and the top of middle sleeve (16) respectively, the diameter of first spacing flange (17) and the diameter of second spacing flange (18) all are less than the diameter of middle sleeve (16), the outer sleeve (3) detachable is installed on casing (1), sleeve (16) in the middle of being equipped with between outer sleeve (3) and inner sleeve (4), be equipped with first spacing flange (17) on the outer sleeve, be equipped with second spacing flange (18) on inner sleeve (4), first.

4. The torque detection device according to claim 1, characterized in that: still include stopping ratchet, stopping ratchet includes ratchet (19), pawl (20), switching-over is dialled circle (21), pawl and is dialled pearl (22) and dial pearl spring (23), ratchet (19) and input shaft (2) coaxial coupling, pawl (20) pin joint is on casing (1), the both ends of pawl (20) respectively are equipped with one stopping tooth (24), the rotatable cover of switching-over is dialled circle (21) is established on casing (1), be equipped with on switching-over dialling circle (21) and dial pearl sliding tray (25) along the radial setting of switching-over dialling circle (21), the pearl (22) are dialled to the pawl and dial pearl spring (23) and locate and dial in pearl sliding tray (25), the pearl (22) are dialled to the pawl and are dialled pearl spring (23) effect down and pawl (20) contact.

5. The torque detection device according to claim 4, characterized in that: the backstop ratchet mechanism comprises three pawls (20) which are uniformly distributed along the circumferential direction of a ratchet wheel (19).

6. The torque detection device according to claim 1, characterized in that: the novel multifunctional electric heating cooker further comprises a handle (26), wherein the handle (26) is installed on the shell (1).

7. The torque detection device according to claim 6, characterized in that: handle (26) are installed on casing (1) through handle adjustment mechanism, handle adjustment mechanism includes handle sleeve (27), bolt (28) and bolt spring (29), handle (26) and handle sleeve (27) fixed connection, handle sleeve (27) cover is established on casing (1), be equipped with on handle (26) along the radial bolt sliding tray (30) that sets up of handle sleeve (27), bolt (28) and bolt spring (29) are established in bolt sliding tray (30), casing (1) is gone up and is equipped with a plurality of bolt holes (31) that match with bolt (28) along circumference interval, bolt (28) insert in bolt hole (31) under the effect of bolt spring (29).

8. The torque detection device according to any one of claims 1 to 7, wherein: the device also comprises a torque sensor (32), an analog-to-digital conversion module (33), a microprocessor (34) and a digital display module (35); the torque sensor (32) is connected with the microprocessor (34) through an analog-to-digital conversion module (33), and the torque sensor (32) is used for detecting the torque of the inner sleeve (4) and transmitting a torque signal to the microprocessor (34) through the analog-to-digital conversion module (33); the microprocessor (34) is connected with a digital display module (35), and the microprocessor (34) is used for processing the torque signal detected by the torque sensor (32) and controlling the digital display module (35) to display the torque value.

9. The torque detection device according to claim 6, characterized in that: the device also comprises a key module (36), a buzzer module (37), an indication module (38), a power supply module (39) and a power supply input module (40); the button module (36), the buzzer module (37) and the indication module (38) are all connected with the microprocessor (34), and the power supply module (39) is connected with the microprocessor (34) through the power supply input module (40).

10. The torque detection device according to any one of claims 1 to 7, wherein: the inner sleeve (4) is a plum blossom sleeve.