Elevator compensation rope tensioning device with fault detection function

Abstract

The application discloses an elevator compensating rope tensioning device with a fault detection function and belongs to the technical field of elevator compensating rope tensioning devices. The elevator compensating rope tensioning device with the fault detection function comprises a fixed connecting plate, the front end of the fixed connecting plate is provided with a wrapping shell, the first wrapping blocks are provided with two, and the two first wrapping blocks are provided with second wrapping blocks at one end. The application solves the problem that the existing compensating rope tensioning device cannot directly and actively correspond to tensioning in the process of detecting faults in actual use. The first wrapping blocks and the second wrapping blocks on the two sides of the clamped compensating rope are transversely adjusted in position through the rotation of the transmission threaded rod, are tensioned and compensated until the pressure sensor detects that the pressure value reaches the set value, the normal operation of the device is guaranteed, and the stability of the elevator in the high-altitude operation process is improved, so that accidents and user injuries are avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of elevator compensation rope tensioning, in particular to an elevator compensation rope tensioning device with a fault detection function. BACKGROUND

[0002] The elevator refers to a vertical elevator that is used for serving a plurality of specific floors in a building, and the elevator car runs on at least two vertical and horizontal permanent transportation devices, in the late 19th century, a friction wheel transmission is adopted, so that the lifting height of the elevator is greatly increased, in the process of passing through the friction wheel transmission, as the moving distance of the elevator bus increases, the elevator will shake during transportation and the operation of the elevator will be unstable, in order to improve the stability of the power operation, the compensation steel wire rope is installed, so that the stability of the elevator is improved.

[0003] A high-speed elevator compensation rope tensioning device is disclosed in Chinese Patent No. CN108502676A, which comprises a mounting bottom plate fixed at the bottom of the elevator shaft pit, a front guide rail and a rear guide rail, a guide wheel box, the middle part of the length direction of the guide wheel box is located in the guide wheel box cavity, and is directly in sliding fit with the front and rear guide rails, a plurality of counterweight plates are arranged in a stacked state in the length direction of the guide wheel box cavity at the lower part of the guide wheel box cavity, a compensation rope wheel is arranged at the left end and the right end of the guide wheel box cavity and above the counterweight plates, a damping buffer mechanism is arranged on the guide wheel box top plate of the guide wheel box at the position corresponding to the middle part of the guide rail connecting beam and is connected with the middle part of the downward side of the guide rail connecting plate, a group of compensation ropes, one end of the group of compensation ropes is connected with the lower part of the car, the middle part is sleeved on the compensation rope wheel, and the other end is connected with the counterweight block. The application simplifies the structure, facilitates manufacturing and assembly, and reduces the space occupation of the elevator shaft pit.

[0004] However, the existing compensation rope tensioning device cannot detect the inclination caused by the overhigh elevator and the fault caused thereby in the actual use process, and cannot directly and actively tension corresponding in the process of detecting the fault, therefore, the existing demand is not met, and therefore, the application provides an elevator compensation rope tensioning device with a fault detection function. SUMMARY

[0005] The purpose of the present application is to provide a kind of elevator compensation rope tensioning device with fault detection function, by the rotation of transmission screw rod and drive the first wrapping block and the second wrapping block on the both sides of clamping compensation rope are adjusted position, tension and compensation to pressure sensor detects that pressure value reaches the set value, actively detect the state of compensation rope, actively detect fault and adjust and tension, it is convenient for the use of user, also convenient for the normal operation of device to guarantee elevator, avoid the poor stability of elevator in the process of high altitude operation due to compensation rope slackening, thereby produce accident and cause user injury, solve the problems raised in the above background art.

[0006] To achieve the above object, the present application provides the following technical scheme: a kind of elevator compensation rope tensioning device with fault detection function and installation method, including fixed connecting plate, the front end of the fixed connecting plate is provided with wrapping shell, the lower end outside the wrapping shell is provided with hydraulic telescopic rod;

[0007] It further includes first wrapping block, the first wrapping block is provided with two, respectively set up in the both sides outside wrapping shell, one end of two first wrapping blocks is provided with second wrapping block, the inside of second wrapping block and first wrapping block is provided with article storage cavity, one side inside the article storage cavity is provided with pressure sensor, one end of two pressure sensors is arrayed with four shock absorbers, the middle of the one end of pressure sensor is provided with four second adjusting roller, two ends of four second adjusting rollers are provided with second transmission bar, and the both ends of second transmission bar and second adjusting roller are rotatably connected, first transmission bar is fixedly connected between second transmission bar and shock absorber, the rear end outside the wrapping shell is provided with output motor, and output motor is electrically connected with pressure sensor, four second adjusting rollers are externally connected by transmission belt, third installation slot is arranged between first wrapping block and second wrapping block, one side outside the third installation slot is longitudinally provided with two fixed connecting strips, and the both ends of fixed connecting strip are fixedly connected with first wrapping block and second wrapping block respectively.

[0008] Preferably, the middle of the inside of the wrapping shell is provided with first sector gear, the both sides of the front end outside the first sector gear are provided with second sector gear, one side outside two second sector gears is engagedly connected with one side outside first sector gear, transmission screw rod is arranged between two second sector gears and wrapping shell, and one end of transmission screw rod is rotatably connected with wrapping shell, one end of transmission screw rod is fixedly connected with one end of second sector gear.

[0009] Preferably, one side of the transmission screw rod is provided with a sliding cavity, and the sliding cavity extends through and extends to the inner and outer ends of the wrapping shell, one side of the sliding cavity is provided with a transmission rod, the other side of the transmission screw rod is provided with a sliding block, one side of the sliding block is fixedly connected with one side of the transmission rod, and the other side of the transmission rod is fixedly connected with one side of the first wrapping block.

[0010] Preferably, one end of the hydraulic telescopic rod is provided with a third wrapping block, the lower end of the outer side of the third wrapping block is provided with a first adjusting roller, the lower end of the outer side of the first adjusting roller is provided with anti-falling plates on both sides, one end of the two anti-falling plates is fixedly connected with the front and rear ends of the third wrapping block, the upper end of one side of the two anti-falling plates is provided with a first anti-falling strip, and the lower end of one side of the two anti-falling plates is provided with a second anti-falling strip.

[0011] Preferably, the second anti-falling strip is provided with two second installation grooves, and the first anti-falling strip is provided with two first installation grooves.

[0012] Preferably, one end of the output motor is provided with a fixed connection plate, the fixed connection plate and the wrapping shell are fixedly connected through a wrapping fixing ring, and the two ends of the wrapping fixing ring are fixedly connected with the wrapping shell and the fixed connection plate.

[0013] Preferably, the two sides of the inner side of the fixed connection plate are provided with installation grooves, the two installation grooves extend into the inner side of the fixed connection plate, the installation grooves are provided with two, and the two sides of the inner side of the installation grooves are provided with installation through holes, the installation through holes extend through and extend to the front and rear ends of the fixed connection plate.

[0014] Preferably, the front end of the wrapping shell is transversely provided with a plurality of heat dissipation strips, and the heat dissipation strips are welded and fixed with the wrapping shell, and the two sides of the inner side of the wrapping shell are provided with filling blocks.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1、The present application is provided with a pressure sensor on one side of the second wrapping block and the first wrapping block, when the pressure sensor detects a change in pressure, it is considered that the compensation rope needs to be tensioned, the first wrapping block and the second wrapping block on both sides of the clamped compensation rope are driven to adjust the position transversely through the rotation of the transmission screw rod, and the compensation rope is tensioned and compensated until the pressure value detected by the pressure sensor reaches the set value, the state of the compensation rope is actively detected, the fault is actively detected and adjusted, and the user is convenient to use, the normal operation of the device is guaranteed, and the stability of the elevator during high-altitude operation is improved, so that accidents and user injuries are avoided.

[0017] 2、The first anti-falling strip is arranged on both sides of the lower end of the first adjusting roller, and the lower end of the two first anti-falling strips is provided with a second anti-falling strip, so that the compensation rope wrapped outside the first adjusting roller is limited by the first anti-falling strip and the second anti-falling strip during actual installation and tensioning of the compensation rope, the compensation rope is actively prevented from falling off, and the compensation rope is prevented from being tensioned off the tensioning device, the control strength of the tensioning device on the compensation rope during use is improved, and on the other hand, the compensation rope can be installed by being sequentially threaded through the second installation slot and the first installation slot.

[0018] 3、The first transmission strip is arranged at one end of the shock absorber, the first transmission strip is provided with four second adjusting rollers at one end, the transmission belt can be attached and clamped on both sides of the compensation rope through the pushing of the shock absorber and the transmission of the transmission belt, the compensation rope can be limited and fixed through clamping and fixing, and the corresponding pressure sensor can improve the accuracy of pressure detection when the compensation rope is loose and needs to be tensioned through clamping and fixing. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole external structure perspective view of the application;

[0020] Figure 2 It is a wrapping shell transmission structure schematic view of the application;

[0021] Figure 3 It is a first wrapping block and second wrapping block internal transmission structure schematic view of the application;

[0022] Figure 4 It is a anti-falling plate and first adjusting roller position relationship perspective view of the application;

[0023] Figure 5 It is a fixed connection plate external structure perspective view of the application.

[0024] In the figure: 1. Fixed connecting plate; 2. Output motor; 3. Wrapping fixing ring; 4. Mounting groove; 5. Mounting through hole; 6. Wrapping shell; 7. Heat dissipation strip; 8. Transmission rod; 9. First wrapping block; 10. Second wrapping block; 11. Fixed connecting strip; 12. Pressure sensor; 13. Hydraulic telescopic rod; 14. Third wrapping block; 15. First adjusting roller; 16. Anti-falling plate; 17. First anti-falling strip; 18. Second anti-falling strip; 19. First mounting groove; 20. Second mounting groove; 21. First sector gear; 22. Second sector gear; 23. Transmission threaded rod; 24. Sliding block; 25. Sliding cavity; 26. Filling block; 27. Article storage cavity; 28. Shock absorber; 29. ​​First transmission bar; 30. Second transmission bar; 31. Second adjusting roller; 32. Transmission belt; 33. Third mounting groove. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] To further understand the content of this invention, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , this embodiment provides the following technical solutions:

[0027] An elevator compensating rope tensioning device with a fault detection function comprises a fixed connecting plate 1, a wrapping shell 6 is provided at the front end of the fixed connecting plate 1, and a hydraulic telescopic rod 13 is provided at the lower end of the outer portion of the wrapping shell 6;

[0028] The first wrapping block 9 is provided with two, which are respectively arranged on both sides of the wrapping shell 6 outside, one end of the two first wrapping blocks 9 is provided with a second wrapping block 10, the inside of the second wrapping block 10 and the first wrapping block 9 is provided with an article storage cavity 27, one side of the inside of the article storage cavity 27 is provided with a pressure sensor 12, one end of the two pressure sensors 12 is arranged with four shock absorbers 28, the middle of one end of the pressure sensor 12 is provided with four second adjusting rollers 31, both ends of the four second adjusting rollers 31 are provided with second transmission bars 30, and the second transmission bars 30 are rotatably connected with both ends of the second adjusting rollers 31, the second transmission bars 30 and the shock absorbers 28 are fixedly connected through the first transmission bars 29, the rear end of the wrapping shell 6 is provided with an output motor 2, and the output motor 2 is electrically connected with the pressure sensor 12, the outside of the four second adjusting rollers 31 is drivingly connected through a transmission belt 32, the third mounting groove 33 is arranged between the first wrapping block 9 and the second wrapping block 10, one side of the outside of the third mounting groove 33 is longitudinally provided with two fixed connection strips 11, and both ends of the fixed connection strips 11 are fixedly connected with the first wrapping block 9 and the second wrapping block 10 respectively.

[0029] In order to solve the technical problems that the existing compensation rope tensioning device cannot detect the tilt caused by the overhigh elevator in actual use and cannot directly and actively tension corresponding in the process of detecting the fault, please refer to Figure 1 and Figure 2 The embodiment provides the following technical scheme:

[0030] The middle of the inside of the wrapping shell 6 is provided with a first sector gear 21, both sides of the front end of the outside of the first sector gear 21 are provided with second sector gears 22, one side of the outside of the two second sector gears 22 is meshingly connected with one side of the outside of the first sector gear 21, transmission screw rods 23 are arranged between the two second sector gears 22 and the wrapping shell 6, one end of the transmission screw rod 23 is rotatably connected with the wrapping shell 6, and one end of the transmission screw rod 23 is fixedly connected with one end of the second sector gear 22.

[0031] Specifically, the rotation of the first sector gear 21 is output and transmitted by the second sector gear 22, so that the user can actively adjust the positions of the first wrapping block 9 and the second wrapping block 10, and the positions are adjusted, so that the distances between the first wrapping block 9 and the second wrapping block 10 on both sides and the wrapping shell 6 are equal, the stability of the device during use is improved, and the compensation rope can be actively tensioned after detecting the fault.

[0032] Further, please refer to Figure 1 and Figure 2The embodiment provides the following technical scheme:

[0033] The transmission screw rod 23 is externally provided with a sliding cavity 25, the sliding cavity 25 extends through and extends to the inner and outer ends of the wrapping shell 6, one side of the sliding cavity 25 is externally provided with a transmission rod 8, the other side of the transmission screw rod 23 is externally provided with a sliding block 24, one side of the sliding block 24 is fixedly connected with one side of the transmission rod 8, and the other side of the transmission rod 8 is fixedly connected with one side of a first wrapping block 9.

[0034] Specifically, the transmission rod 8 is converted from rotary motion into linear motion by the limitation of the sliding cavity 25, and the transmission rod 8 is converted from rotary motion into linear motion under the driving of the output motor 2.

[0035] Further, referring to Figure 1 , Figure 2 and Figure 4 , the embodiment provides the following technical scheme:

[0036] One end of the hydraulic telescopic rod 13 is provided with a third wrapping block 14, the lower end of the third wrapping block 14 is externally provided with a first adjusting roller 15, the lower ends of the two sides of the first adjusting roller 15 are externally provided with anti-falling plates 16, one end of each of the two anti-falling plates 16 is fixedly connected with the front end and the rear end of the third wrapping block 14, the upper end of one side of each of the two anti-falling plates 16 is provided with a first anti-falling strip 17, and the lower end of one side of each of the two anti-falling plates 16 is provided with a second anti-falling strip 18.

[0037] Specifically, the first adjusting roller 15 externally compensates and protects the compensation rope through the first anti-falling strip 17 and the second anti-falling strip 18, and the wrapping and protection can avoid that the loose compensation rope falls off and loses the control of the tensioning device.

[0038] Further, referring to Figure 1 , Figure 2 and Figure 4 , the embodiment provides the following technical scheme:

[0039] The second anti-falling strip 18 is provided with two, a second mounting groove 20 is arranged between the two second anti-falling strips 18, and the first anti-falling strip 17 is provided with two, a first mounting groove 19 is arranged between the two first anti-falling strips 17.

[0040] Specifically, the compensation rope can be sequentially threaded through the second mounting groove 20 and the first mounting groove 19 in the process of mounting and fixing.

[0041] Further, referring to Figure 1 and Figure 2 , the embodiment provides the following technical scheme:

[0042] One end of the output motor 2 is provided with a fixed connection plate 1, which is fixedly connected with the wrapping shell 6 through a wrapping fixing ring 3, the two ends of the wrapping fixing ring 3 are fixedly connected with the wrapping shell 6 and the fixed connection plate 1 respectively, and the relative position between the second wrapping block 10 is connected by the wrapping fixing ring 3, which can facilitate the installation of the device and can facilitate the protection of the surrounding of the output motor 2.

[0043] Specifically, the output of the output motor 2 can adjust two first wrapping blocks 9 and.

[0044] Further, please refer to Figure 1 、 Figure 2 and Figure 5 , the embodiment provides the following technical scheme:

[0045] The two sides of the inside of the fixed connection plate 1 are provided with mounting grooves 4, and the two mounting grooves 4 extend into the inside of the fixed connection plate 1, the mounting grooves 4 are provided with two, and the two sides of the inside of the mounting grooves 4 are provided with mounting through holes 5, and the mounting through holes 5 extend through and extend to the front and rear ends of the fixed connection plate 1.

[0046] Specifically, by screwing the mounting grooves 4 and the mounting through holes 5 in sequence and embedding into the wall, the fixing and installation of the device can be completed.

[0047] Further, please refer to Figure 1 , the embodiment provides the following technical scheme:

[0048] The front end of the outside of the wrapping shell 6 is transversely provided with a plurality of heat dissipation strips 7, and the heat dissipation strips 7 are welded and fixed with the wrapping shell 6, and the two sides of the inside of the wrapping shell 6 are provided with filling blocks 26.

[0049] Specifically, the heat inside the wrapping shell 6 can be dissipated by the plurality of heat dissipation strips 7, which can improve the heat dissipation effect of the device, facilitate the device to be used in a position with high temperature for a long time, and improve the service life of the tensioning device.

[0050] Working principle: when using the elevator compensation rope tensioning device, according to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5, in order to make the device to actively detect the compensation rope abnormal state, and actively tension, the compensation rope placed between the lower end of the first adjusting roller 15 outside and the third installation slot 33, the compensation rope is pulled by the elevator to extrude one of the pressure sensors 12 inside the first wrapping block 9 or the second wrapping block 10, through the corresponding pressure sensor 12 to continuously detect the pressure, when the pressure is lower than the set value, through the pressure sensor 12 based on the output motor 2 a signal, the output motor 2 drives the first sector gear 21 to rotate through the output shaft, the first sector gear 21 drives the sliding block 24 to rotate through the transmission screw rod 23, the rotation of the sliding block 24 will produce relative motion between the sliding block 24, the sliding block 24 will drive the transmission rod 8 to rotate, the transmission rod 8 changes from rotary motion to horizontal linear motion by the limitation of the sliding cavity 25, the horizontal linear motion can adjust the position of the first wrapping block 9 and the second wrapping block 10 horizontally, and complete the tension of the compensation rope, actively detect the state of the compensation rope, detect the fault and actively adjust the tension, in order to avoid the device in the actual use process, the compensation rope is not compensated in time and falls off, the compensation rope passes through the second installation slot 20 and the first installation slot 19 in turn, and is attached to the lower end of the first adjusting roller 15 outside, and in the process of falling off, the first anti-falling strip 17 and the second anti-falling strip 18 wrap and limit the compensation rope about to fall off respectively, to avoid falling off, in order to make the device to adapt to different thickness of the compensation rope, and at the same time improve the accuracy of fault detection, through the pushing of the shock absorber 28, the two transmission belts 32 on both sides of the compensation rope can be attached and continuously detected through the extension of the shock absorber 28 in the process of tension adjustment.

[0051] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. An elevator compensating rope tensioning device with a fault detection function, comprising a fixed connecting plate (1), a wrapping shell (6) provided at the front end of the fixed connecting plate (1), a hydraulic telescopic rod (13) provided at the lower end of the outer portion of the wrapping shell (6), characterized in that ； The invention also includes a first wrapping block (9), wherein two first wrapping blocks (9) are provided and are respectively provided on both sides of the outside of the wrapping shell (6), a second wrapping block (10) is provided at one end of each of the two first wrapping blocks (9), an article storage cavity (27) is provided inside each of the second wrapping block (10) and the first wrapping block (9), a pressure sensor (12) is provided on one side of the article storage cavity (27), four shock absorbers (28) are provided in an array at one end of each of the two pressure sensors (12), four second adjustment rollers (31) are provided in the middle of one end of each of the pressure sensors (12), a second transmission bar (30) is provided at both ends of the four second adjustment rollers (31), and the second transmission bar (30) is provided at both ends of the second adjustment rollers (31). 0) and both ends of the second adjustment roller (31) are rotatably connected, the second transmission bar (30) and the shock absorber (28) are fixedly connected via the first transmission bar (29), an output motor (2) is provided at the rear end of the exterior of the wrapping shell (6), and the output motor (2) is electrically connected to the pressure sensor (12), the exterior of the four second adjustment rollers (31) are transmission-connected via a transmission belt (32), a third mounting groove (33) is provided between the first wrapping block (9) and the second wrapping block (10), two fixed connecting bars (11) are longitudinally provided on one side of the exterior of the third mounting groove (33), and the two ends of the fixed connecting bar (11) are fixedly connected to the first wrapping block (9) and the second wrapping block (10), respectively.

2. The elevator compensating rope tensioning device with fault detection function according to claim 1, characterized in that: A first sector gear (21) is provided in the middle of the interior of the wrapping shell (6), and second sector gears (22) are provided on both sides of the external front end of the first sector gear (21), and one side of the exterior of the two second sector gears (22) is meshed with one side of the exterior of the first sector gear (21), and a transmission threaded rod (23) is provided between the two second sector gears (22) and the wrapping shell (6), and one end of the transmission threaded rod (23) is rotatably connected to the wrapping shell (6), and one end of the transmission threaded rod (23) is fixedly connected to one end of the second sector gear (22).

3. The elevator compensating rope tensioning device with fault detection function according to claim 2, characterized in that: A sliding cavity (25) is provided on one side of the outside of the transmission threaded rod (23), and the sliding cavity (25) passes through and extends to the inner and outer ends of the wrapping shell (6). A transmission rod (8) is provided on one side of the sliding cavity (25), and a sliding block (24) is provided on the other side of the outside of the transmission threaded rod (23). One side of the sliding block (24) is fixedly connected to one side of the transmission rod (8), and the other side of the transmission rod (8) is fixedly connected to one side of the first wrapping block (9).

4. The elevator compensating rope tensioning device with fault detection function according to claim 3, characterized in that: A third wrapping block (14) is provided at one end of the hydraulic telescopic rod (13), a first adjusting roller (15) is provided at the lower end of the outside of the third wrapping block (14), anti-falling plates (16) are provided on both sides of the lower end of the outside of the first adjusting roller (15), one end of the two anti-falling plates (16) are fixedly connected to the front and rear ends of the third wrapping block (14), the upper ends of the two anti-falling plates (16) are provided with a first anti-falling strip (17), and the lower ends of the two anti-falling plates (16) are provided with a second anti-falling strip (18).

5. The elevator compensating rope tensioning device with fault detection function according to claim 4, characterized in that: Two second anti-falling strips (18) are provided, and a second mounting groove (20) is provided between the two second anti-falling strips (18); two first anti-falling strips (17) are provided, and a first mounting groove (19) is provided between the two first anti-falling strips (17).

6. The elevator compensating rope tensioning device with fault detection function according to claim 5, characterized in that: A fixed connecting plate (1) is provided at one end of the output motor (2); the fixed connecting plate (1) is fixedly connected to the wrapping shell (6) via a wrapping fixing ring (3); and the two ends of the wrapping fixing ring (3) are fixedly connected to the wrapping shell (6) and the fixed connecting plate (1), respectively.

7. The elevator compensating rope tensioning device with fault detection function according to claim 6, characterized in that: Both sides of the interior of the fixed connecting plate (1) are provided with mounting grooves (4), and the two mounting grooves (4) extend into the interior of the fixed connecting plate (1). There are two mounting grooves (4), and both sides of the interior of the two mounting grooves (4) are provided with mounting through holes (5), and the mounting through holes (5) pass through and extend to the front and rear ends of the fixed connecting plate (1).

8. The elevator compensating rope tensioning device with fault detection function according to claim 7, characterized in that: A plurality of heat dissipation strips (7) are laterally arranged at the front end of the exterior of the wrapping shell (6), and the heat dissipation strips (7) are welded and fixed to the wrapping shell (6). Filling blocks (26) are arranged on both sides of the interior of the wrapping shell (6).

Images