Real-time monitoring and dynamic leveling device for elevator car installation posture

Abstract

The application relates to the elevator installation technical field, in particular to a real-time monitoring and dynamic leveling device for the installation posture of an elevator car, which comprises a base, a monitoring mechanism and a leveling mechanism. The monitoring mechanism is arranged on the top of the base and comprises a mounting seat, an angle sensor array and a data processor; the angle sensor array comprises a plurality of inclination sensors and is used for detecting the inclination angles of the elevator car in the front-rear direction and the left-right direction. The leveling mechanism is arranged on the bottom of the base and is linked with the monitoring mechanism, and comprises four adjusting units, a connecting rod mechanism and a driving assembly. The four adjusting units are arranged at four corner positions on the bottom of the base respectively, each adjusting unit comprises a supporting seat, a lead screw and a supporting block, the connecting rod mechanism comprises a transverse connecting rod and a longitudinal connecting rod and is used for linking the four adjusting units, and the driving assembly is used for driving the adjusting units to move, so that synchronous lifting adjustment of the four supporting points of the elevator car is realized.

Description

Technical Field

[0001] This invention relates to lifting and transport machinery, specifically an elevator car installation posture real-time monitoring and dynamic leveling device. Background Technology

[0002] The elevator car is a crucial component of the elevator system, and its orientation during installation directly affects the elevator's safe operation and lifespan. During installation, it's essential to ensure the car maintains the correct vertical orientation to guarantee the proper functioning of components such as the door operator and guide shoes, and to minimize vibration and noise during operation.

[0003] In actual installation, manual adjustment of the four corners of the elevator car using jacks, shims, and other tools is typically required to achieve the desired installation posture. However, due to a lack of effective real-time monitoring methods, operators often rely on experience or simple levels for rough checks. This method struggles to achieve precise posture measurement, and the adjustment process involves repeated measurements and adjustments, consuming significant time and effort. Furthermore, in some elevator retrofitting projects in older buildings or existing elevator renovation projects, the limited installation space makes traditional manual leveling methods even more difficult. Therefore, existing elevator car posture adjustment methods have limitations and fail to meet the efficiency and precision requirements of modern elevator installation.

[0004] Invention Content This invention provides a novel elevator car installation posture real-time monitoring and dynamic leveling device, which can detect the car's posture angle in real time during elevator car installation and synchronously adjust the four support points of the car through a mechanical leveling mechanism, thereby achieving precise installation posture adjustment and solving the technical problems of low leveling accuracy and low efficiency caused by relying on manual experience judgment in the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: Design an elevator car installation posture real-time monitoring and dynamic leveling device, including a base, a monitoring mechanism, and a leveling mechanism, wherein: The monitoring mechanism is located on the top of the base and is used to detect the attitude changes of the elevator car during installation in real time. The monitoring mechanism includes a mounting base, an angle sensor array, and a data processor. The mounting base is fixedly installed at the top center of the base. The angle sensor array includes multiple tilt sensors, which are fixedly installed at the four corners of the mounting base. The sensing end of each tilt sensor is set to face a different direction to detect the tilt angle of the elevator car in the front-back and left-right directions. The data processor is fixedly installed inside the mounting base, and the multiple tilt sensors are connected to the data processor through signal lines.

[0006] The leveling mechanism is located at the bottom of the base and is linked with the monitoring mechanism. It is used to synchronously adjust the four support points of the elevator car. The leveling mechanism includes four adjustment units, a linkage mechanism and a drive assembly. The four adjustment units are respectively located at the four corners of the bottom of the base. Each adjustment unit includes a support seat, a lead screw and a support block. The support seat is fixedly installed at the four corners of the bottom of the base. The lead screw is threaded to the inner wall of the support seat and can move up and down relative to the support seat. The support block is fixedly installed at the bottom end of the lead screw and is used to support the corresponding corner of the elevator car.

[0007] The linkage mechanism includes a transverse linkage and a longitudinal linkage. Connecting blocks are fixedly connected to the outside of the lead screws of the four adjustment units. The four connecting blocks are connected in sequence through the transverse linkage and the longitudinal linkage to form a quadrilateral linkage structure. The connecting blocks located at opposite corners are connected through the longitudinal linkage, and the two connecting blocks located at adjacent positions are connected through the transverse linkage.

[0008] The drive assembly is located on the side of the base and connected to the lead screw of one of the adjustment units. It is used to drive the lead screw of the adjustment unit to rotate, and through the linkage of the linkage mechanism, it drives the other three adjustment units to move synchronously, thereby realizing the synchronous lifting and lowering adjustment of the four support points of the elevator car.

[0009] Optionally, the angle sensor array further includes a calibration module, which is located inside the mounting base and connected to the data processor. The calibration module is used to perform temperature compensation and zero-point calibration on the data collected by multiple tilt sensors to eliminate the influence of ambient temperature changes on measurement accuracy.

[0010] Optionally, the data processor further includes a display module, which is fixedly installed on the side of the mounting base and is used to display the tilt angle values ​​of the elevator car in the front-back and left-right directions in real time. The surface of the display module is provided with a protective glass cover.

[0011] Optionally, each of the adjustment units further includes a guide sleeve, which is fixedly installed on the inner wall of the support and sleeved on the outer wall of the lead screw to ensure the straightness of the lead screw when it moves up and down. The inner wall of the guide sleeve is provided with a lubricating layer.

[0012] Optionally, the top of the support block is provided with an arc-shaped concave surface, which matches the shape of the support point of the elevator car, in order to increase the contact area between the support block and the support point of the car and prevent the support block from slipping during the leveling process.

[0013] The optional drive assembly includes a handwheel, a reducer, and a transmission gear set. The handwheel is fixedly installed on the outside of the base. The input end of the reducer is fixedly connected to the handwheel. The output end of the reducer is connected to the lead screw of one of the adjustment units through the transmission gear set to achieve speed reduction and torque increase, so that the operator can easily rotate the lead screw to adjust the car height.

[0014] Optionally, the transmission gear set includes a driving gear and a driven gear. The driving gear is fixedly mounted on the shaft at the output end of the reducer, and the driven gear is fixedly mounted on the top of the lead screw and meshes with the driving gear.

[0015] Optionally, each of the support bases is further provided with a height adjustment pad between itself and the base. The thickness of the multiple height adjustment pads is different, which is used to make a rough adjustment of the height of the base during initial installation so that the base is basically level before being precisely leveled by the leveling mechanism.

[0016] Optionally, the base is also provided with multiple casters at the bottom, which are respectively located at the edge of the bottom of the base to facilitate the movement and handling of the entire device at the installation site.

[0017] Optionally, the monitoring mechanism also includes an alarm module, which is installed inside the mounting base and connected to the data processor. When the tilt angle of the elevator car exceeds a preset safety threshold, the alarm module emits an audible and visual alarm signal to remind the operator to stop the leveling operation and check the cause.

[0018] Optionally, the housing of each tilt sensor is made of stainless steel, which has good waterproof and dustproof performance and is suitable for the humid environment inside the elevator shaft.

[0019] This invention provides a novel device for real-time monitoring and dynamic leveling of elevator car installation posture, which has the following beneficial effects: This elevator car installation real-time attitude monitoring and dynamic leveling device, with a monitoring mechanism set on the top of the base, can detect the elevator car's attitude angle in real time during installation, replacing the traditional manual experience judgment and simple leveling instrument detection methods. This achieves accurate attitude measurement and solves the technical problem of low detection accuracy in existing technologies. Simultaneously, through the coordinated arrangement of four adjustment units and linkage mechanisms in the leveling mechanism, the four support points can be simultaneously raised and lowered under the drive of the drive component. A single operation can complete the synchronous leveling of the four corners of the car, significantly reducing the tedious process of repeated measurement and adjustment in traditional leveling methods and significantly improving leveling efficiency. Furthermore, the display module allows operators to intuitively see the tilt angle value, facilitating precise adjustment to the target attitude. The alarm module can promptly issue a warning when the tilt angle exceeds the safety threshold, further ensuring the safety of elevator car installation. This device has a simple structure and is easy to operate, suitable for both new and old elevator installation projects, especially in space-constrained elevator retrofitting projects in older buildings, where it has significant advantages and effectively meets the efficiency and accuracy requirements of modern elevator installation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the novel overall installation structure of the present invention; Figure 2 This is a schematic diagram of the monitoring mechanism structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the arrangement of the novel angle sensor array of the present invention; Figure 4 This is a schematic diagram of the leveling mechanism structure according to an embodiment of this application; Figure 5 This is a schematic diagram of the novel adjustment unit structure of the present invention; Figure 6 This is a schematic diagram of the linkage structure of the linkage mechanism according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the novel drive component of the present invention; Figure 8 This is a partial schematic diagram of the bottom of the base according to an embodiment of this application; Explanation of reference numerals in the attached figures: 1. Base; 2. Mounting bracket; 3. Tilt sensor; 4. Data processor; 5. Calibration module; 6. Display module; 7. Alarm module; 8. Support base; 9. Lead screw; 10. Support block; 11. Guide sleeve; 12. Connecting block; 13. Lateral connecting rod; 14. Longitudinal connecting rod; 15. Handwheel; 16. Reducer; 17. Transmission gear set; 18. Height adjustment pad; 19. Caster wheel; 20. Protective glass cover. Detailed Implementation

[0021] The technical solutions of the novel embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the novel invention, and not all embodiments. Based on the embodiments of the novel invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the novel invention.

[0022] Please see Figures 1 to 8 The present invention provides a real-time monitoring and dynamic leveling device for elevator car installation posture. This device is applied at the elevator installation site and can detect the car's posture angle in real time during the elevator car installation process. It can also synchronously adjust the four support points of the car through a mechanical leveling mechanism to achieve precise installation posture adjustment.

[0023] The new elevator car installation posture real-time monitoring and dynamic leveling device provided by the present invention mainly includes three parts: base 1, monitoring mechanism and leveling mechanism. The detailed structure and working principle of each part will be described below with reference to the accompanying drawings.

[0024] I. Structural Description of Monitoring Agencies Please see Figure 1 and Figure 2 The monitoring mechanism is located on top of the base 1 and is used to detect the attitude changes of the elevator car during installation in real time. The monitoring mechanism includes a mounting base 2, an angle sensor array, and a data processor 4.

[0025] Mounting base 2 is fixedly installed at the top center of base 1. Mounting base 2 is a square plate structure with mounting holes for mounting tilt sensors 3 at its four corners. The interior of mounting base 2 has a cavity for accommodating data processor 4, and the side of mounting base 2 has a mounting position for display module 6.

[0026] The angle sensor array includes multiple tilt sensors 3 and a correction module 5. The tilt sensors 3 are fixedly mounted at the four corners of the mounting base 2, with the sensing end of each tilt sensor 3 facing a different direction. Figure 3 As shown, the sensing ends of the two tilt sensors 3 located on the front side of the mounting base 2 are positioned towards the front-rear direction of the elevator car to detect the tilt angle of the elevator car in the front-rear direction; the sensing ends of the two tilt sensors 3 located on the rear side of the mounting base 2 are positioned towards the left-right direction of the elevator car to detect the tilt angle of the elevator car in the left-right direction. This arrangement allows for comprehensive detection of changes in the elevator car's posture during installation.

[0027] Each tilt sensor 3 has a stainless steel housing, providing excellent waterproof and dustproof performance, and can withstand the humid environment inside the elevator shaft. The tilt sensor 3 is connected to the data processor 4 via a signal line, transmitting the collected tilt angle signal to the data processor 4 for processing.

[0028] The calibration module 5 is located inside the mounting base 2 and connected to the data processor 4. It is used to perform temperature compensation and zero-point calibration on the data collected by multiple tilt sensors 3, eliminating the influence of ambient temperature changes on measurement accuracy. The calibration module 5 internally stores temperature compensation algorithms and zero-point calibration data, and can automatically adjust the output value of the tilt sensors 3 according to changes in ambient temperature to ensure measurement accuracy.

[0029] The data processor 4 is fixedly installed inside the mounting base 2. The data processor 4 integrates a signal amplification circuit, an analog-to-digital conversion circuit, and a data processing chip. The data processor 4 receives signals from multiple tilt sensors 3, processes them, and outputs the tilt angle values ​​of the elevator car in the front-to-back and left-to-right directions.

[0030] The display module 6 is fixedly installed on the side of the mounting base 2, and a protective glass cover 20 is provided on the surface of the display module 6. The display module 6 uses an LCD screen, which can display the tilt angle values ​​of the elevator car in the front-back and left-right directions in real time. The protective glass cover 20 is made of tempered glass, which can effectively protect the display module 6 from external impacts and contamination.

[0031] The alarm module 7 is located inside the mounting base 2 and connected to the data processor 4. The alarm module 7 integrates a buzzer and indicator light. When the tilt angle of the elevator car exceeds the preset safety threshold, the alarm module 7 emits an audible and visual alarm signal to remind the operator to stop the leveling operation and check the cause.

[0032] II. Structural Description of the Leveling Mechanism Please see Figures 4 to 6 The leveling mechanism is located at the bottom of the base 1 and is linked to the monitoring mechanism to synchronously adjust the four support points of the elevator car. The leveling mechanism includes four adjustment units, a linkage mechanism, and a drive assembly.

[0033] The four adjustment units are respectively located at the four corners of the bottom of the base 1. Each adjustment unit includes a support base 8, a lead screw 9, a support block 10, and a guide sleeve 11.

[0034] The support base 8 is fixedly installed at the four corners of the bottom of the base 1. The support base 8 is a hollow cubic structure with threaded holes on its inner wall for installing the guide sleeve 11. The top of the support base 8 is fixedly connected to the bottom of the base 1, and the bottom of the support base 8 has a through hole for the lead screw 9 to pass through.

[0035] The lead screw 9 is threaded to the inner wall of the support base 8 and can move up and down relative to the support base 8. A guide sleeve 11 is fitted onto the outer wall of the lead screw 9. The guide sleeve 11 is fixedly installed on the inner wall of the support base 8 and fitted onto the outer wall of the lead screw 9 to ensure the straightness of the lead screw 9 when it moves up and down. The inner wall of the guide sleeve 11 is provided with a lubrication layer. The lubrication layer uses molybdenum disulfide grease, which can reduce the friction between the lead screw 9 and the guide sleeve 11, making the up and down movement of the lead screw 9 smoother.

[0036] The support block 10 is fixedly installed at the bottom end of the lead screw 9 and is used to support the corresponding corner of the elevator car. The top of the support block 10 is provided with an arc-shaped concave surface, which matches the shape of the support point of the elevator car to increase the contact area between the support block 10 and the support point of the car and prevent the support block 10 from slipping during the leveling process.

[0037] Please see Figure 6 The linkage mechanism includes a transverse link 13 and a longitudinal link 14. Connecting blocks 12 are fixedly connected to the external surfaces of the lead screws 9 of the four adjustment units. The four connecting blocks 12 are sequentially connected via the transverse link 13 and the longitudinal link 14, forming a quadrilateral linkage structure. Connecting blocks 12 located diagonally are connected via the longitudinal link 14, and two adjacent connecting blocks 12 are connected via the transverse link 13. This quadrilateral linkage structure ensures synchronous movement of the four adjustment units. When the lead screw 9 of one adjustment unit moves up or down, the linkage mechanism drives the other three adjustment units to move synchronously.

[0038] Please see Figure 7 The drive component is located on the side of the base 1 and connected to the lead screw 9 of one of the adjustment units. It is used to drive the lead screw 9 of the adjustment unit to rotate. Through the linkage of the linkage mechanism, it drives the other three adjustment units to move synchronously, so as to realize the synchronous lifting and lowering adjustment of the four support points of the elevator car.

[0039] The drive assembly includes a handwheel 15, a reducer 16, and a transmission gear set 17. The handwheel 15 is fixedly mounted on the outside of the base 1, and the operator can drive the entire leveling mechanism by turning the handwheel 15. The input end of the reducer 16 is fixedly connected to the handwheel 15, and the output end of the reducer 16 is connected to the lead screw 9 of one of the adjustment units through the transmission gear set 17 to achieve speed reduction and torque increase, allowing the operator to easily turn the lead screw 9 to adjust the car height.

[0040] The transmission gear set 17 includes a driving gear and a driven gear. The driving gear is fixedly mounted on the shaft at the output end of the reducer 16, and the driven gear is fixedly mounted on the top of the lead screw 9 and meshes with the driving gear. The driving gear has fewer teeth than the driven gear, achieving the effect of speed reduction and torque increase.

[0041] III. Structural Description of the Base Please see Figure 1 and Figure 8 The base 1 serves as the supporting foundation for the entire device. Multiple casters 19 are located at the bottom edge of the base 1, facilitating movement and transport of the entire device on-site. The casters 19 employ a swivel caster design, enabling multi-directional movement.

[0042] Each support 8 is also provided with a height adjustment pad 18 between it and the base 1. The multiple height adjustment pads 18 have different thicknesses and are used for initial coarse adjustment of the height of the base 1 during installation, ensuring the base 1 is basically level before precise leveling via a leveling mechanism. The height adjustment pads 18 are made of steel plate, providing sufficient strength and stability.

[0043] IV. Working principle and operating procedures of the device The working principle of the elevator car installation posture real-time monitoring and dynamic leveling device provided by this invention is as follows: During elevator car installation, the base 1 is first placed in the installation position in the elevator shaft. By adjusting the thickness of the height adjustment pad 18, the base 1 is made to be basically level. Then, the four corners of the elevator car are placed on the arc-shaped concave surfaces of the four support blocks 10, ensuring that the four support points of the car are in good contact with the support blocks 10.

[0044] The monitoring mechanism is activated, and tilt sensor 3 begins to collect the tilt angle of the elevator car in the forward and backward and left and right directions in real time. Tilt sensor 3 transmits the collected signals to data processor 4, which processes the signals and outputs the tilt angle value to display module 6. Simultaneously, data processor 4 transmits the processed data to calibration module 5 for temperature compensation and zero-point calibration, eliminating the influence of ambient temperature changes on measurement accuracy.

[0045] The operator observes the tilt angle value displayed on the display module 6. When the elevator car is found to be tilted, the operator turns the handwheel 15. The handwheel 15 drives the lead screw 9 of one of the adjustment units to rotate via the reducer 16 and the transmission gear set 17. The rotation of the lead screw 9 causes the corresponding support block 10 to move up and down. Simultaneously, through the quadrilateral linkage structure composed of the connecting block 12, the transverse connecting rod 13, and the longitudinal connecting rod 14, the lead screws 9 of the other three adjustment units rotate synchronously, thereby causing the other three support blocks 10 to move up and down synchronously. Because the four support blocks 10 rise and fall synchronously, the four support points of the elevator car rise or fall synchronously, thereby achieving precise adjustment of the elevator car's posture.

[0046] If the tilt angle of the elevator car exceeds the preset safety threshold during the leveling process, the alarm module 7 will issue an audible and visual alarm signal to remind the operator to stop the leveling operation and check the cause.

[0047] The guide sleeve 11 ensures the straightness of the lead screw 9 when it moves up and down, and the lubrication layer reduces the friction between the lead screw 9 and the guide sleeve 11, making the leveling operation smoother. The arc-shaped concave surface at the top of the support block 10 matches the shape of the support point of the elevator car, increasing the contact area and preventing the support block 10 from slipping during the leveling process.

[0048] The elevator car installation posture real-time monitoring and dynamic leveling device provided by this invention can complete the synchronous leveling of the four corners of the car in a single operation, greatly reducing the tedious process of repeated measurement and adjustment in traditional leveling methods and significantly improving leveling efficiency. Simultaneously, the monitoring mechanism can detect the elevator car's posture angle in real time, achieving precise posture measurement and solving the technical problem of low detection accuracy in existing technologies.

[0049] Although novel embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for real-time monitoring and dynamic leveling of elevator car installation posture, characterized in that: Includes a base (1), a monitoring mechanism, and a leveling mechanism, wherein: The monitoring mechanism is set on the top of the base (1) and is used to detect the attitude change of the elevator car during the installation process in real time. The monitoring mechanism includes a mounting base (2), an angle sensor array and a data processor (4). The mounting base (2) is fixedly installed at the top center of the base (1). The angle sensor array includes multiple tilt sensors (3). The multiple tilt sensors (3) are fixedly installed at the four corners of the mounting base (2). The sensing end of each tilt sensor (3) is set to face different directions to detect the tilt angle of the elevator car in the front-back direction and the left-right direction respectively. The data processor (4) is fixedly installed inside the mounting base (2). The multiple tilt sensors (3) are connected to the data processor (4) through signal lines respectively. The leveling mechanism is located at the bottom of the base (1) and is linked with the monitoring mechanism. It is used to synchronously adjust the four support points of the elevator car. The leveling mechanism includes four adjustment units, a linkage mechanism and a drive assembly. The four adjustment units are respectively located at the four corners of the bottom of the base (1). Each adjustment unit includes a support seat (8), a screw rod (9) and a support block (10). The support seat (8) is fixedly installed at the four corners of the bottom of the base (1). The screw rod (9) is threaded to the inner wall of the support seat (8) and can move up and down relative to the support seat (8). The support block (10) is fixedly installed at the bottom end of the screw rod (9) and is used to support the corresponding corners of the elevator car. The linkage mechanism includes a transverse link (13) and a longitudinal link (14). The lead screws (9) of the four adjustment units are respectively fixedly connected to connecting blocks (12). The four connecting blocks (12) are connected in sequence through the transverse link (13) and the longitudinal link (14) to form a quadrilateral linkage structure. The connecting blocks (12) located at opposite corners are connected through the longitudinal link (14), and the two connecting blocks (12) located in adjacent positions are connected through the transverse link (13). The drive assembly is located on the side of the base (1) and connected to the lead screw (9) of one of the adjustment units. It is used to drive the lead screw (9) of the adjustment unit to rotate. Through the linkage of the linkage mechanism, it drives the other three adjustment units to move synchronously, thereby realizing the synchronous lifting and lowering adjustment of the four support points of the elevator car.

2. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The housing of each tilt sensor (3) is made of stainless steel.

3. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The top of the support block (10) is provided with an arc-shaped concave surface, which matches the shape of the support point of the elevator car.

4. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: Each of the adjustment units also includes a guide sleeve (11), which is fixedly installed on the inner wall of the support base (8) and sleeved on the outer wall of the lead screw (9) to ensure the straightness of the lead screw (9) when it moves up and down.

5. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 4, characterized in that: The inner wall of the guide sleeve (11) is provided with a lubricating layer.

6. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The angle sensor array also includes a calibration module (5), which is located inside the mounting base (2) and connected to the data processor (4) for temperature compensation and zero-point calibration of the data collected by multiple tilt sensors (3).

7. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The data processor (4) also includes a display module (6), which is fixedly installed on the side of the mounting base (2) and is used to display the tilt angle values ​​of the elevator car in the front-back direction and the left-right direction in real time.

8. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 7, characterized in that: The surface of the display module (6) is provided with a protective glass cover (20).

9. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The drive assembly includes a handwheel (15), a reducer (16) and a transmission gear set (17). The handwheel (15) is fixedly installed on the outside of the base (1). The input end of the reducer (16) is fixedly connected to the handwheel (15). The output end of the reducer (16) is connected to the lead screw (9) of one of the adjustment units through the transmission gear set (17).

10. The elevator car installation posture real-time monitoring and dynamic leveling device according to claim 1, characterized in that: The monitoring mechanism also includes an alarm module (7), which is located inside the mounting base (2) and connected to the data processor (4) to issue an audible and visual alarm signal when the tilt angle of the elevator car exceeds a preset safety threshold.

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